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LUTC PKT 03-16-2009 City of Federal Way City Council Land Use/Transportation Committee March 16, 2009 5:30 p.m. City Hall Council Chambers MEETING AGENDA 1. CALL TO ORDER 2. PUBLIC COMMENT (3 minutes) 3. COMMTITEE BUSINESS Action Topic Title/Description Presenter Page or Info A. Approval of Minutes: March 2, 2009 LeMaster 2 Action B. 2007-2008 Pavement Markings Contract Perez 5 Action Closeout C. Steel Lake Crest Preliminary Plat Long-Woods 7 Action Council Date N/A 04/07/2009 Consent 04/07/2009 Consent Time 5 min. 5 min. 10 min. 4. OTHER 5. FUTURE MEETINGS/AGENDA ITEMS: Monday, April 6, 2009. 6. ADJOURN Committee Members Linda Kachmar, Chair Jim Ferrell Dini Dudas Oty Staff Cary M. Roe, P.E., Assistant Oty Manager/Emergency Manager Darlene LeMaster, Administrative Assistant II 253-835-2701 G:ILIffC)LIffC Agendas and SUmmaries 200913-16-09 LIfTC Agenda.doc City of Federal Way City Council Land Use/Transportation Committee March 2, 2009 5:30 PM City Hall City Council Chambers MEETING SUMMARY Committee Members in Attendance: Committee Chair Kochmar and Committee Members Ferrell and Duclos. Staff Members in Attendance: Assistant City Manager Cary Roe, Director of Community Development Services Greg Fewins, Public Works Director Marwan Salloum, City Manager Neal Beets, Deputy Public Works Director Ken Miller, Assistant City Attorney Peter Beckwith, Surface Water Manager Will Appleton, Senior Planner Margaret Clark, Contract Senior Planner Jim Harris, Contract Senior Planner Lori Michaelson, Street Systems Project Engineer Brian Roberts, ESA & NPDES Coordinator Don Robinett, SWM Engineer Jeff Wolf, and Administrative Assistant II Darlene LeMaster. 1. CALL TO ORDER Committee Chair Kochmar called the meeting to order at 5:35 PM. 2. APPROVAL OF MINUTES The February 23,2009 LUTC meeting minutes were approved. Moved: Duclos Seconded: Ferrell Passed: Unanimously, 3-0 3. PUBLIC COMMENT No public comment was received. A letter from Robert N. Parnell, P.E., of R.N. Parnell Company was entered into record, supporting 'time extensions of preliminary short plat subdivision approval from the current two year period to either four or five years to complete short plat conditions for recording." Mr. Parnell's request refers to the Disney Short Plat. 4. BUSINESS ITEMS Topic TitlelDescription Forward to Council A. Easter Lake Flood Control Improvements & West Branch Joes Creek Culvert Replacement Project - 100% Design Review and Request for Authorization to Bid 3/17/2009 Consent Will Appleton presented information on this item. There was no public comment. It was noted that staff will have confirmation on grant status for approximately 6 weeks. Should the City receive grant funds for this project, any surplus funding would be returned to the respective SWM unallocated CIP accounts. Committee forwarded Option #1 as presented. Moved: Duclos Seconded: Ferrell Passed: Unanimously, 3-0 B. Interlocal Agreement with Federal Way Public School District for S 30Sth St Memorial Stadium Driveway Improvements (to be constructed under Easter Lake Flood Control Improvements Project) - Request Authorization to Execute Agreement 3/17/2009 Consent Will Appleton presented information on this item. There was no public comment or discussion. Committee forwarded Option #1 as presented. Moved: Ferrell Seconded: Duclos Passed: Unanimously, 3-0 G:\LUTClLUTC Agendas and Summaries 2009\03-02-09-Minutes.doc 2 Land Userrransportation Committee Page 2 March 2, 2009 c. S 34Sth Street HOV Lanes - Project Acceptance Marwan Salloum presented information on this item. There was no public comment. It was noted that this project was completed roughly $221 K under budget, including the contingency. Committee forwarded Option #1 as presented. Moved: Duclos Seconded: Ferrell Passed: Unanimously, 3-0 D. NPDES 2009 Annual Report and SWMP Will Appleton presented information on this item. There was no public comment. There was a brief conversation on Illicit Discharge Detection and Elimination (lODE). Mr. Appleton noted that reports of lODE occur more often with industry and businesses rather than residential and have not involved hazardous waste. The goal is to keep contaminants out of the system before they enter the system. Committee forwarded Option #1 as presented. Moved: Ferrell Seconded: Duclos Passed: Unanimously, 3-0 E. RV's in Residential Zones Code Amendments Contract Senior Planner Jim Harris presented information on this item. There was no public comment. Committee Member Duclos commented on an applicant being able to request and be granted a twelve month extension. Is there potential for an applicant to sit and do nothing, leaving hislher residence unsafe to occupy, believing that they may be granted a twelve month extension? Committee Member Ferrell added that he would like language also added that reflects the extension being granted based on a good faith effort on the part of the homeowner to restore hislher home to livable condition. Mr. Harris responded to both committee members that yes, there is language for a twelve month extension in the code amendment and staff is open to additional language being added to reflect whether or not a good faith effort is being made to complete reconstruction for a primary residence. Committee forwarded Option #2 as modified to require the applicant to also document that they are making good faith efforts to complete construction of their primary residence. Moved: Ferrell Seconded: Duclos Passed: Unanimously, 3-0 F. Construction Hours Code Amendments Contract Senior Planner Lori Michaelson presented information on this item. There were two comments in favor of this code amendment: Laura Escude, WSDOT - Ms. Escude is supporting the code amendment and commends staff for initiating these amendments to the code. Chair Kochmar asked how many evenings the WSDOT project at S 272M St/I-5 offramps will take. Ms. Escude said the number of nights will be minimal; once the project calendar is fmalized, WSDOT will know specific dates. Brian Roberts, P.E., Street Systems Project Engineer- Mr. Roberts spoke in behalf of Public Works in favor of the proposed code amendment. Sunday evening construction is desired from a few standpoints: Traffic volume is typically the lightest on late Sunday evening, early Monday morning. With traffic volume reduced, crews can be more productive with fewer interruptions while working. More productivity is more efficient which equals cost effectiveness. Work done on a Sunday is seen by labor agreements as the first day of the week, therefore a cost savings on worker compensation. Regardless, there is a very good chance to reduce project costs by being able to honor requests for Sunday evening construction hours on a case by case basis. Committee forwarded Option #1 as presented. Moved: Ferrell Seconded: Duclos Passed: Unanimously, 3-0 G:\LUTClLUTC Agendas and Summaries 2009\OJ-02.()9.Minules.doc 3 3/17/2009 Consent 3/17/2009 Consent 3/17/2009 Ordinance First Reading 3/17/2009 Ordinance First Reading Land Useffransportation Committee Page 3 March 2, 2009 G. 2009 Planning Commission and Long Range Work Program 3/17/2009 Consent Margaret Clark presented information on this item. There was no public comment. Committee Member Duclos asked for clarification on the proposed shift in FTE for current vs. long range planning. Ms. Clark responded that the designated staff person is currently 0.5 FTE Current Planning and 0.5 FTE Long Range Planning. Based on the proposed 2009 Planning Commission and long range work program, staff proposes changing this staff person to be 1.0 FTE Long Range Planning. Committee moved to forward the staff recommendation and in addition, earmark $77K in Community Development carry forward money for planning consultant services. Moved: Ferrell Seconded: Duclos Passed: Unanimously, 3-0 5. FUTURE MEETING The next regular LUTC meeting will be Monday, March 16,2009 at 5:30 PM in City Council Chambers. 6. ADJOURN The meeting adjourned at 6:45 PM. Attest: Darlene LeMaster, Administrative Assistant II COMMITTEE APPROVAL: Linda Kochmar, Chair Jim Ferrell, Member Dini Duclos, Member G:\LUTClLUTC Agendas and Summaries 2009\03-02-09-Minutes.doc 4 COUNCIL MEETING DATE: April 7, 2009 ITEM #:_ ..-..---..-.-.---.--.-...--..-------~..-..---.-----.-----..---.----.----.-----...----...-----------.---.--______..___H..___________. CITY OF FEDERAL WAY CITY COUNCIL AGENDA BILL SUBJECT: AG# 07-125, 2007-08 Citywide Pavement Marking Project- Final Acceptance POLICY QUESTION: Should the Council accept the 2007-08 Citywide Pavement Marking Project constructed by Stripe Rite, Inc. as complete? COMMITTEE: Land Use and Transportation Committee MEETING DATE: March 16th, 2009 CATEGORY: [gI Consent 0 Ordinance o City Council Business D Resolution STAFF REpORT By: Rick Perez, P.E.~ Traffic Engineer'-K-__ Attachments: LUTC memo dated March 16th, 2009. D Public Hearing D Other DEPT: Public Works Options Considered: 1. Authorize fmal acceptance of the 2007-2008 Citywide Pavement Marking Project constructed by Stripe Rite, Inc., in the amount of$41,421.85 as complete. 2. Do not authorize final acceptance of the completed 2007-2008 Citywide Pavement Marking Project constructed by Stripe Rite, Inc. as complete and provide direction to staff. STAFF RECOMMENDATION: Staff recommends Option 1. CITY MANAGER APPROVAL: DIRECTOR APPROVAL: Council Committee Council COMMITTEE RECOMMENDATION: Place Option 1 on the April 7, 2009 Council Consent Agenda for approval. Linda Kochmar, Chair Jim Ferrell, Member Dini Duclos, Member PROPOSED COUNCIL MOTION: "I move to authorize final acceptance of the 2007-2008 Citywide Pavement Marking Project constructed by Stripe Rite, Inc. in the amount of$41,421.85 as complete. " COUNCIL ACTION: o APPROVED o DENIED o TABLEDIDEFERREDINO ACTION o MOVED TO SECOND READING (ordinances only) REVISED - 0210612006 (BELOW TO BE COMPLETED BY CITY CLERKS OFFICE) COUNCIL BILL # 1ST reading Enactment reading ORDINANCE # RESOLUTION # 5 CITY OF FEDERAL WAY MEMORANDUM DATE: TO: VIA: FROM: SUBJECT: March 16, 2009 Land Use and Transportation Committee Cary M. Roe, P.E., Assistant City Manager, C.O.O., Emergency Manager Rick Perez, P.E., City Traffic Engineer~ 2007-08 Citywide Pavement Marking - Project Acceptance and Retainage Release BACKGROUND: Prior to release of retainage on a Public Works construction project, the City Council must accept the work as complete to meet State Department of Revenue and State Department of Labor and Industries requirements. The above-referenced contract Stripe Rite, Inc. is complete. The final construction contract amount is $41,421.85. This is $56,578.15 below the $98,000.00 budget that was approved by the City Council on May 1 st, 2007. K:\LUTC\2009\03-16-09 2007-08 Pavement Marking project - Final Acceptance.doc 6 COUNCIL MEETING DATE: April 7, 2009 ITEM #: .---_____._._________R__________________o..____..______._.__._____________._____._______.___._..~_.____._ CITY OF FEDERAL WAY CITY COUNCIL AGENDA BILL SUBJECT: STEEL LAKE CREST PRELIMINARY PLAT ApPLICATION, FILE 07-103897-00-SU POLICY QUESTION: SHALL THE PROPOSED 28-LOT PRELIMINARY PLAT APPLICATION BE APPROVED? COMMITIEE: LAND USE AND TRANSPORTA nON COMMITTEE (LUTe) CATEGORY: MEETING DATE: March 16,2009 [8] Consent D City Council Business D Ordinance [8] Resolution D D Public Hearing Other ~:r A~~~!Q~!_~Y.:::!2~!'fNE LO_NG-WOODS~~~~r ~l~_~~~_______.______.__________~~~~_~~mm~ni~..:>evelo~~e~~________ Attachments: Hearing Examiner recommendation dated March 3, 2009; Steel Lake Crest Preliminary Plat staff report dated November 7, 2008, with exhibits including reduced scale preliminary plat map. Options Considered: I. Adopt the Hearing Examiner Recommendation and approve the Steel Lake Crest Preliminary Plat Resolution. 2. Reject the Hearing Examiner Recommendation. 3. City Council may adopt its own recommendations and approve the Steel Lake Crest Preliminary Plat Resolution. 4. City Council may adopt its own recommendations and disapprove the Steel Lake Crest Preliminary Plat Resolution. HEARING EXAMINER'S RECOMMENDATION: Approval of the Preliminary Plat application, subject to the conditions of approval recommended by staff and the following: "1. Clearing and grading at the subdivision stage of developrnent is limited to the extent necessary to ensure (a) gravity discharge to the detention facilities proposed by the applicant; (b) that all proposed lots are buildable; and (c) that the lots and improvements can be located and configures as proposed. Buildable lots are defmed as lots that can accommodate a home with at least a 2,500 square foot footprint and still comply with all applicable regulations, including critical area regulations." CITY MANAGER ApPROVAL: OWl. Committee DIRECTOR ApPROVAL: .:rc- Committee Council Council COMMIITEE RECOMMENDATION: Linda Kochmar, Chair Dini Duclos, Member Jim Ferrell, Member PROPOSED COUNCIL MOTION: (BELOW TO BE COMPLETED BY CITY CLERKS OFFICE) COUNCIL ACTION: o APPROVED o DENIED o T ABLED/DEFERREDINO ACTION o MOVED TO SECOND READING (ordinances only) REVISED - 02/06/2006 COUNCIL BILL # 1 ST reading Enactment reading ORDINANCE # RESOLUTION # Doc. I.D. 47341 7 ~ CITYOF ~ Federal Way MEMORANDUM DATE: March 11, 2009 TO: Linda Kochmar, LUTC Chair Committee Members Duclos and Ferrell FROM: Joanne Long-Woods, AICP, Senior Planner Greg Fewins, Director, Department of Community Development Cary Roe, Assistant City Manager ~ Preliminary Plat of Steel Lake Crest VIA: SUBJECT: Attached please find copies of the Agenda Bill, Hearing Examiners Decision, and the Staff Report with all exhibits. This case is unusual in that the Hearing Examiner recommendation is different from the staff recommendation. Therefore, we would like to give a brief synopsis of the reasons for the differing recommendations. The preliminary plat application is for the subdivision of 6. 77 acres into 28 single family lots. The proposal is to mass grade the site, including on slopes exceeding 15%, remove a majority of the significant trees on site, make significant cuts and likely utilize retaining walls extensively in order to provide level building sites for the future homes. Federal Way City Code (FWCC), Chapter 20-179(a-c) limits grading and use of retaining walls on slopes exceeding 15% and requires that mature vegetation be maintained to the maximum extent possible. Staff did not feel the proposal was consistent with FWCC 20-179 (a-c) and met with the applicant in an effort to find options to make the plat more consistent with the above cited code section. The applicant made a business decision to move forward with the existing design unchanged. On November 17,2008 the Hearing Examiner held a public hearing on the proposed preliminary plat of Steel Lake Crest. Staff recommended denial of the plat for the reasons noted above. The Hearing Examiner recommended approval ofthe plat subject to conditions identified by staff and adding one additional condition related to grading of the site. The Hearing Examiner, in his decision, cited case law that suggests the code sections in question may be too vague to enforce consistently as well as recent case law which suggests that government must demonstrate the need for such regulations on a case-by-case basis. In light of the Hearing Examiner's recommendation, staff is supportive of moving this plat forward with a recommendation of approval. 8 BEFORE THE HEARING EXAMINER FOR THE CITY OF FEDERAL WAY Phil Olbrechts, Hearing Examiner RE: Steel Lake Plat Group Preliminary Plat 07-103897 -OO-SU FINDINGS OF FACT, CONCLUSIONS OF LAW AND RECOMMENDATION INTRODUCTION The applicant requests approval of a preliminary plat to subdivide 6.77 acres into 28 lots for establishment of a single-family residential housing development. The Examiner recommends approval of the application, subject to some potential modification of the proposed clearing and grading. ORAL TESTIMONY Isaac Conlen - Planning Manager Mr. Conlen made a short introduction of the Staffs recommendation of denial of this proposal. He stated that although this is not the normal recommendation from the Staff, due to an inability of the applicant and staff to come to a consensus regarding issues pertaining to grading and clearing, they felt that the project was not consistent with applicable Federal Way standards and policies. Joanne Long-Woods - Federal Way Senior Planner Ms. Long-Woods introduced the basics of the project for the hearing, all of which is in the Staff Report and in the Finding of Facts. She also addressed mitigation measures that have been proposed regarding noise from 1-5 being blocked from the proposed project as well as the geotechnical studies that have revealed buried debris piles. The planner also specifically addressed the issues of clearing and grading that has been proposed. The overall change in elevation is approximately 70 feet across the site, and the average slope is 9.3%; however, on 6 of the lots the slope is reaching 40%. Overall, 90% of the site will need to be graded. The grading will result in 17,000 cubic yards of fill brought onto the site and will result in significant cut areas as well. She discussed these actions in relation to Chapter 9 of the Federal Way Code, the general policy of which is that as slopes increase, development in those areas should decrease and that slopes of 40% should be retained in order to prevent erosion and stormwater problems. Finally, in response to a question from the Hearing Examiner, she stated that she did not have any outstanding concerns regarding stormwater drainage resulting from the site. Brant Schwiekel - Project Planner /Engineer for Applicant with 20 years experience in the field Mr. Schwiekel began by stating the hardships he faced while designing the internal roadway for the development due to the actions of the Staff. He also stated his disagreement with the requirement of the City to install pedestrian walkways along Military Road South, as he believes it is unsafe for motorists and oedestrians alike. but the idea was incorporated into the {PA072ISOO.DOC; 1/13041.15ool1l} Preliminary Plat Recommendation p.l Findings, Conclusions and Recommendation 9 plan in order to move the project forward. In addition, he discussed the sight distance requirements for King County being met by the proposed plan and that the grading of slopes would be necessary to build the approved road. Mr. Schwiekel then began addressing the concerns raised regarding the slopes and grading that have been proposed. He stated that the slopes were not natural to the site, as they had resulted from previous grading work, and that without the mass grading proposed, there would be no collection gradient available for stormwater mnoff.The road would be elevated and the stormwater pond would be uphill from the entire infrastructure, serving no purpose. In the proposal. the applicants will not be developing the site themselves, and because of this, it would be better to allow them to do all of the grading and clearing rather than leave it up to the multiple potential builders that could be involved. Also, he discussed the concept that mass grading works for developments. because it is conducive to families that want a normal flat yard and a nonnal flat driveway, rather than sloping on their property. He also pointed out that the density propQsed for this site is necessary and appropriate. for Federal Way in order to create livable housing and to bring in property tax. Mr. Schwiekel also addressed his frustration with the Planning Staff's inability to give him standards to follow based on the language of applicable code sections, and he also believes that the new regulations are harsh on the development community and will significantly increase the difficulty to build in the City. He also stated a basic unwillingness to reduce the number of lots on the project in order to avoid building on the 40% slopes but did not really state a specific reason for this stance other than believing that he and the applicants have done their best to meet the requirements of the regulations. In his rebuttal, Mr. Schwiekel restated his belief that future citizens and residents want flat lots. flat backyards for their kids, and flat driveways that are more that access ppints to their garages, and the best way to handle. this desire is to handle it now; under the guise of one entity, rather than waiting for each individual property owner to deal with it themselves. He also states that flat lots allow for contractors to install standard foundations, rather than foundations that are much more complicated and costly. In his belief, the only way this site can be developed is using the current proposal. In his closing, he showed photographs of homes on 15% slopes in other developments in Pederal Way, and once again requested that the City provide him with specific criteria relating to the applicable regulations. Allen W oida - Applicant/Owner Mr. Woida basically outlined the route the project bas taken in order to get to the current application proceeding. He also thinks that the plan is in the best interest of the City as well as the residents. And fin all y, he stated his belief that the applicable code language regarding grading and slope is not firm language, and the applicants should be granted a leniency, within reason, when interpreting the language of the applicable regulations. Margaret Raner - Neighbor living on Steel Lake Ms. Raner stated her concern over clear cutting the land and the grading procedures that would talee place should the project be approved. She also stated that she believes there will be an adverse affect on the environment due to the removal of all but 19 trees and also that the proposal should not have been granted an exemption from the Shoreline Substantial Development Permit. Finally, she stated her agreement with the Staffs denial recommendation. Gloria Trinidad - Applicant/Owner (pA0721SOO.DOC;1I13041.1S0017/1 Preliminary Plat Recommendation p.2 Findings. Conclusions and Recommendation 10 Ms. Trinidad stated that she does not believe that the clearing of the trees will have an environmental impact and that the trees on site are alder trees, and as such are useless. Ms. Trinidad also discussed her belief that the neighborhood is beginning to resemble a slum, and new development is necessary to revive the neighborhood. Ken Miller - Deputy Public Works Director Mr. Miller testified that from an engineering standpoint, Mr. Schwiekel's design is standard and appropriate and that stormwater is not a concern of the Public Works Department at this stage. He also discusses the code and the intent of the code to use the existing topography of the land rather than to mass grade the property. In addressing the applicant's request for the City to provide specific standards and definitions to follow regarding the regulation, Mr. Miller states that specific criteria are difficult to give because of the uniqueness of each individual proposed lot and of the site overall. He also stated that although the applicant expressed concern over the safety of providing pedestrian walkways along Military Road, this is incorporated into the City's pedestrian facilities plans and the walkways required of the applicant will connect to future walkway construction along Military Road. EXHIBITS See list of exhibits at p. 16 of the November 7, 2008, staff report prepared by Joanne Long- Woods and also: Exhibit T: Exhibit U: Exhibit V: Exhibit W: Exhibit X: Email from David Kaplan on November 12, 2008 PowerPoint presentation by Joanne Long-Woods Site diagrams provided by Brant Schwiekel Photos of current homes on 15% slope Letter from Deb Barker FINDINGS OF FACT Procedural: 1. Applicant The applicant is Steel Lake Plat Group, with owners Verlin & Linda Elder, Al W oida, and Mike & Gloria Trinidad. 2. Hearing. The Hearing Examiner conducted a hearing on the application at 2:00 p.m. at Federal Way City Hall on November 17, 2008. The applicant requested, and was granted, several extensions on the issuance of a recommendation by the Examiner. The last extension expired on February 17,2009. Substantive: 3. SiteIProoosal Description. The applicant proposes to subdivide approximately 6.77 acres . into 28 lots for establishment of a single-family residential housing development, with public streets, sewer, and water services. Transportation improvements will include half-street frontage improvements and dedication of 9 feet of additional right-of-way along 28th Avenue South, an internal loop roadway with curb, gutter, and sidewalks. Approximately 1.61 acres will be {PA0721 SOO.OOC:1I13041. 15001 7/} Preliminary Plat Recommendation p.3 Findings, Conclusions and Recommendation 11 dedicated to public right-of-way and .61 acres will be allocated for storm drainage facilities, landscaping tracts along 28th Avenue South and Military Road South, and an 8-foot-wide pedestrian pathway that runs along the northeast edge of the plat to Military Road South. The site consists of four parcels, is rectangular in shape. and fronts onto 28th Avenue South to the west and Interstate 5 right-of-way and Military Road South to the east. There are currently three single-family residences, a shed, bam, and swimming pool on the lots.. All structures are planned to be demolished. The site naturally slopes from the southwest comer to the northeast comer, and there is an approximate drop of70 feet across the site, with ~ll averag~ slope.of 9.3%. There are afew small areas where the average slope exceeds 40%. The majority of the. steep slopes are near the existing houses and are a result of prior grading activities on the site. The.~lopeson the southedgeofthe sitearetypicaUy 15% or greater. The vegetation on~ite is primarily deciduous trees with some large evergreens located on the east side of the properly, as well as vine m~ples, cedars, blackberry bushes, andneules. There are over 200 trees on the site, and 87 have been identified as significant. There are al.so deer and s()ngbirds existing on the subject property. Steel Lake is located within 200 feet of the proposed preliminary plat and would usually require the applicants to apply for a Shoreline Substantial Development Permit, but the Director of Community Development exempted the proposal from such a permit. 4. Characteristics of the Area. The property is situated in the central 'portion of the City in an already developed single-family residential area. The properties are located south of 308th with 28th Avenue South bordering the west side and the Interstate 5 right-of-way cQrridor on the east side. Single-family residences border the property to the north, west, and south. There are many significant trees surrounding the property as well. 5. Adverse Impacts. A. Clearing and Grading. Staff have recommended denial of this project due to massive clearing and grading. However, staff have not identified any adverse impacts associated with this clearing and grading. In fact, staff testified that the clearing and grading will not create any drainage problems. There is no evidence supporting a finding for any adverse impacts associated with the proposed clearing and grading. B. Tree Retention. Neighbors and staff expressed concern for the amount of trees removed by the project. The City's tree retention requirements set the standard for acceptable levels of tree retention. As noted in the staff report, the project complies with the City's tree retention requirements. There are no other adverse impacts discern able from the record. 6. Adeauacv of Infrastructure and Public Services. As mitigated by staff, adequate infrastructure will serve development as follows: . Transportation: The to-be-constructed internal roadway will be a Type w street and include 28-foot pavement width, vertical.curb and gutter,.four-foot . planter strips, five-foot-wide sidewalks, three-foot utility strip, streetlights, and street trees. An 8- foot-wide paved pedestrian pathway will be constructed from the internal road in the northeast area of the plat that will follow the outside edge of the proposed storm {P A0721SOO.DOC; 1/13041. 150011l} Preliminary Plat Recommendation p.4 Findings, Conclusions and Recommendation 12 drainage area and connect to Military Road. The half~street frontage improvements will allow safer pedestrian travel along 28th A venue South as there are no sidewalks along this area at this time, just a natTOW paved area outside of a white line marked along the roadway, which is used by students traveling along the road. The City's Traffic Engineer reviewed the submitted plans and concluded that the proposed street layout of the project is consistent with the adopted codes and Comprehensive Plan. As proposed and as required by the FWCC, aU internal and external roadways shall be improved to all applicable' FWCC street standards, and rights-of-ways must be dedicated by Statutory Wananty Deed to the City of Federal Way. In addition, a concurrency permit is required for the development, to determine whether there is adequate roadway capacity to accommodate the development and also identifies traffic mitigation. The analysis determined 9 Transportation Improvement Plan projects that will be impacted by the increased automobile traffic coming to and from the proposed development (See project chart on page 9 of Staff Report). This impact results in $39,790 of pro-rata mitigation necessary to maintain adopted level of service standards. · Pedestrian Svstem: As proposed and required, the plat complies with the FWCC subdivision code requirements for on- and off-site pedestrian circulation, providing pedestrian pathways along 28th Avenue South as well as on the internal road as well. · Open Space: The applicant is proposing to install a pedestrian pathway and three landscaping buffer areas, for a total of 8,223 square feet of open space, leaving 36,013.5 square feet remaining in order to meet the statutory requirements. The applicant proposes to pay a "fee in lieu of' for the remainder of the required open space, for a total of $50,155.12. The proposal was circulated to and approved by the Director of the City Parks Department. and the fee will be required to be paid upon final plat stage, based on the CUtTent assessed value of the land at that time. · Drainage: Development of the site will create additional runoff from new impervious surfaces such as streets, driveways, and rooftops. Storm drainage facilities are being designed in accordance with the requirements of Level 1 Flow control and Basic Water Quality treatment of the 1998 KCSWDM, as modified by the City. Stormwater runoff currently discharges towards the northeast comer of the site and enters a roadside ditch along the western edge of Military Road South, which then flows to the south, is conveyed through a series of pipes under Military Road and Interstate 5, and eventually drains into Lake DoIlof, which lies at the upper reacb,es of the Mill Creek drainage basin. Mill Creek eventually flows into the Green River, which flows into the Puget Sound. Preliminary design of the drainage system indicates that stormwater runoff from the site will continue to discharge at the current, natural location. Additionally, a narrow strip of 28th Avenue South drains into Steel Lake. Street improvements to 28th A venue South will increase the amount of impervious area that drains into Steet Lake. The increase in impervious area does not warrant additional flow control or water quality treatment facilities, but the developer's engineer has agreed to install a small water quality treatment facility in the lowest downstream catch basin, if determined to be necessary. The approved storm drainage facilities must be constructed per City code requirements, prior to {PA0721Soo.DOC; 1113041.1500 17/} Preliminary Plat Recommendation p.5 Findings, Conclusions and Recommendation 13 final plat approval and recording of the subdivision. Final review and approval of the storm drainage facilities as shown on the engineering plan will occur in conjunction with full drainage review. . Water: The applicant proposes to serve the subdivision with a public water supply and distribution system managed by the Lakehaven Utility District. The May 18. 2007, Certificate of Water Availability indicates Lakehaven's capacity to serVe the proposed development through a Developer Extension Agreement (DEA). However, the applicant will need to reapply for the availability letter since the determination is only valid for one year from the date. of issuance. . Sewage: The applicant proposes to serve the pl"Oposed plat by a public sewer system managed by Lakehaven Utility District A May 2007 Certificate of Sewer Availability indicates the district's capacity to serve the proposed development through a Developer Extension Agreement (DEA) between the applicant and the district. The applicant will be extending the sewer to the far edge of the subject site and may provide opportunities for other properties to hook up to the sewer on a latecomer basis. However, the applicant will need to reapply for the availability letter since the determination is only valid for one year from the date of issuance. . Schools: A May 8, 2007 (Ex. N) school access analysis submitted by the applicant indicates that the site is located in the service areas of Wildwood Elementary, Sacajawea Middle School, and Federal Way High School. Also, comments from this report indicate that the development will generate approximately 20-21 additional school aged children. School service areas are reviewed annually and may be adjusted to accommodate enrollment growth and new development. Middle and elementary school students would be required to walk to bus. stops along 28th Avenue South, located at 310th Street and 3Uth Street. High school students would be required to walk to school from this development. Bus stops are subject to change, as student needs increase and roads are developed. School impact fees will be collected at the time of building permit issuance. Currently those fees amount to $3,883.00 plus a $194.00 City administrative fee per single-family housing unit. School impaCt fees are determined on the basis of the District's Capital Facilities Plan and are subject to annual adjustment and update. . Fire Protection: South KingFire and Rescue requires that a fire hydrant be located on the east end of the plat, that the hydrants must be spaced 600.feet or less apart, and that every building lot shall have a fire hydrant within 300 feet. All hydrants shall be in service-prior to and during constluction. The Certificate of Water Availability from Lakehaven Utility District indicates that water will be available to the site in sufficient quantity to satisfy fire flow standards for the proposed development. The exact number and location of fire hydrants will be reviewed and approved by South King Fire and Rescue. CONCLUSIONS OF LAW Procedural: {PA07215oo.DOC; 1113041.1500 17/} Preliminary Plat Recommendation p.6 Findings, Conclusions and Recommendation 14 1. Authority of Hearing Examiner: FWCC 20-110 (4) and (5) provide the Examiner with the authority to conduct a hearing and make a recommendation to the City Council on preliminary plat applications. Substantive: 2. Zoning Designation: Single-Family - High Density. RS7.2. 3. Review Criteria and Application. FWCC 20-126(c) governs the criteria for preliminary plat approval. Those criteria are quoted in italics below and applied to the application under corresponding Conclusions of Law. FWCC 20-126(c): Decisional Criteria. A Hearing Examiner shall use the following criteria in reviewing the preliminary plat and may recommend approval of the plat to the City Council if: ( 1) It is consistent with the comprehensive plan; 4. The applicant proposes a residential development in an area designated by the Federal Way Comprehensive Plan and Zoning Code for residential development. within the densities specified by the Zoning Code. Overall. the project is consistent with the Comprehensive Plan. One potential area of inconsistency concerns the mass clearing and grading proposed for the site. Due to the non mandatory language of the applicable policy and constitutional constraints in interpreting that language, the Examiner does not find an inconsistency. The comprehensive plan policy at issue is Policy NEP55. which provides as follows: "As slope increases; development intensity, site coverage. and vegetation removal should decrease, and thereby minimize drainage problems, soil erosion, siltation, and landslides. Slopes of 40 percent or more should be retained in a natural state, free of structures and other land surface modifications. " There is no clearing and grading discern able from the record of slopes of 40% or more. The issue for purposes of this application is whether development intensity. site coverage and vegetation removal has "decreased" as slopes have "increased." Page 8 of the staff report notes that "the grading plan shows significant cutting and filling in areas exceeding 15% slope." In order to abide constitutional and statutory requirements and to avoid successful legal challenge, the City should interpret its regulation in a manner that is consistent with constitutional and statutory requirements. It is fairly clear from the record that the only way the applicant can avoid the disturbance of the 15% slopes is by reducing the number of lots in those areas. Consequently, a strict application of NEP55 results in a set-aside of property. In this respect. the NEP55 and related regulations are similar to the King County open-space set-aside requirements assessed in Citizens' Alliance for Property Rights v. King County. 145 Wn. App. 649 (2008). In that case the appellate court struck down a King County development regulation requiring portions of property to be retained in its natural state as violating RCW 82.02.020. The Court found that RCW 82.02.020 required King County to show that its set-aside requirements were necessary to mitigate problems created by a development proposal (legally termed "nexus") {PA0721500.DOC;1I13041.1S00I7f} Preliminary Plat Recommendation p. 7 Findings. Conclusions and Recommendation 15 and that the amount of property set-aside was in proportion to the magnitude of the adverse impacts created by the development (legally termed "proportionality"). The Court constmed RCW 82.02.020 as placing the burden of proof on nexus and proportionality upon the government. The Court struck down King County's open-space set-aside requirements because King County failed to meet its burden. Given the King County case, the City should interpret Policy NEP55 in a manner that restricts development when to do so is necessary to avoid adverse impacts of clearing and grading steep slopes. A second constitutional issue that must be used as an interpreted tool is the "void for vagueness" doctrine, where courts will invalidate a development requirement on due process grounds when it is so vague that persons of common intelligence must necessarily guess at its meaning and differ as to its application. Anderson, v. Issaquah, 70 Wn. App. 64 (1993). Consequently, in order to avoid invalidation, vague standards such as "minimize" must only be interpreted as restricting development when it is absolutely clear that the standard has been violated. To do otherwise would simply lead to invalidation anyway. As noted in the Findings of Fact, there was no evidence presented at the hearing to show that the mass grading and clearing would create any adverse impacts. Staff even testified that the mass clearing and grading would not create any drainage problems. Federal Way also has some fairly detailed critical area regulations that would prevent any clearing/grading or development activity that would result in any geological hazards. NEP55, as is the case with m()st comprehensive plan policies, is also vague. It requires thatcleaJ:inglgrading activities "decrease" as slope increases. There is no indication of what level of development is appropriate for the steep slopes on the property. NEP55 is also not a mandatory provision; it only requires that development activity "should" decrease as slopes increase. The City's critical area regulations guide and restxict development on steep slopes. Given the absence of any evidence showing adverse impacts and the vagueness of NEP55, the Examiner concludes that the City's critical area ordinance adequately implements NEP55 for this project and no further limitation on development is required. FWCC 20-126(c)(2): It is consistent with all applicable provisions of the Chapter, including those adopted by reference from the comprehensive plan: 5. As detailed in the staff report, the proposed preliminary plat is consistent with all applicable subdivision regulations and those adopted by reference from the comprehensive plan. The one point where the Examiner disagrees in the staff analysis is staff's finding that the project mass grading and clearing fails to comply with FWCC 20-179. Due to the statutory and constitutional constraints on interpretation detailed in Conclusion of Law No.5, the Examiner finds that the project is marginally consistent with FWCC 20-179, with some modification. FWCC 20-179 provides as follows: (a) All natural vegetation shall be retained on the site to be subdivided except that which will be removed for improvements or grading as shown on approved engineering plans. For zero lot line townhouse development, clearing and grading shall be allowed to accommodate the construction of the building(s). If development is to be phased, clearing and grading shall also be phased. A {PA0721S00.DOC:1I13041.1SOO17/} Preliminary Plat Recommendation p.8 Findings, Conclusions and Recommendation 16 preliminary clearing and grading plan shall be submitted as part of preliminary plat application. (b) Existing mature vegetations shall be retained to the maximum extent possible. Preservation of significant trees pursuant to FWCC 22-1568 shall apply solely to the development of each single-family lot at the time a building pennit is applied for. (c) Lots created on slopes of 15 percent or greater shall minimize grading and shall not result in extensive use of retaining walls. Slopes are to be measured in their natural state. The applicant testified that the clearing and grading was necessary to provide a gradient for stormwater discharge and to allow for level lots. To the extent that the clearing and grading is necessary for stonnwater discharge, the Examiner finds that the clearing/grading is necessary for improvements as contemplated in FWCC 20-179(a). To the extent that the clearing and grading is only necessary to provide for level driveways or yards, the Examiner does not find the clearing/grading consistent with FWCC 20-179(a). The project will be conditioned to allow clearing and grading only to the extent necessary for stonnwater discharge and buildable lots, within the context of the proposed lot and improvement configuration. FWCC 20-179(b) is probably the most difficult standard from the developer's perspective, since it is fairly specific in requiring vegetation to be retained "to the maximum extent possible." Taken literally, this would mean no development should be allowed except for the constitutional takings minimum of one or two homes. Since vegetation covers most all developable sites in Federal Way, a literal application of FWCC 20-179(b) would severely restrict development and would prevent Federal Way from reaching its growth targets mandated by the Washington State Growth Management Act, Chapter 36.70A RCW. Going beyond the constitutional minimum, the City is again left with a vague standard because it is difficult to come to an objective conclusion on what design preserves vegetation "to the maximum extent possible." The proposed condition in the preceding paragraph allows the applicant to have the number of buildable lots he proposes while maintaining the vegetation on each of those lots to the extent consistent with stonnwater control. As conditioned, the project satisfies FWCC 20-179(b). FWCC 20-179(c) is also satisfied by the condition of approval applied in the preceding paragraph. FWCC 20-179(c) does not limit the number of lots on slopes of 15% or more. It just requires the minimization of grading on those lots. That is precisely what the recommended condition of ~pproval does. FWCC 20-126(c)(3): It is consistent with public health, safety, and welfare. 6. The proposed preliminary plat would permit development of the site consistent with the current Single-Family High Density land use classification of the Federal Way Comprehensive Plan and map. Proposed access and fire hydrant locations must meet all requirements of South King Fire and Rescue, and all future structures are required to be sprinldered. As conditioned, future development of the plat in accordance with applicable codes and regulations will ensure protection of the public health, safety, and welfare. (PA0721SOO.DOC; U13041.1S0017/) Preliminary Plat Recommendation p.9 Findings, Conclusions and Recommendation 17 FWCC20-126(c)(4): It is consistent with the design criteria listed in FWCC 20-2: 7. The proposed preliminary plat would promote the purposes identified in FWCC Section 20-2 and the standards and regulations therein, as identified in the staff report, including promotion of safe and convenient travel on streets. provision for the housing needs of the community. and preservation of a portion of the site as common, open space. As proposed, the plat application complies will all provisions of the chapter. FWCC 20-2: This chapter is adopted in furtherance of the comprehensive plan of the City. It is hereby declared that the regulations contained in this chapter are necessary to: ( 1) Promote the health, safety and general welfare in accordance with the standards established by the state and the city,. ,8. As, noted in the Washington SUIte Growth Management Act, the Washington State Legislature has found it to be in the public interest to prevent urban sPrawl and to promote the efficient use of infrastructure. The development. at the. proposed densities, meets these objectives. Also, as previously discussed, the proj~t provides adequate infrastructure to !lleet the needs of the new development For these reasons, the project promotes the 'health, safet-f, and general welfare in accordance with the standards established by the state and the city. FWCC 20-2(2): Promote effective use of land by preventing the overcrowding or scattered development which would injury health, safety or the general welfare due to lack of water supplies, sanitary sewer, dramage, transportation or other public services, or excessive expenditure of public funds for such services: 9. As previously noted, the project constitutes development in an area that is already characterized and developed by residential development. In addition, the project will effectively use the land, combining high-density housing with high levels of open space and on-site infrastructure. Also as previously discussed, the project is served (or as conditioned will be served) by adequate infrastructure. For these reasons, the above criterion is satisfied. FWCC 20~2(4): Provide for adequate light and air. 10. The density of the project meets the density requirements for the RS1.2 'zoning district. The applicant will have to comply with the dimensional requirements of the zoning code for any structures it builds in order to get through building permit review. The dimensional standards of the City's Zoning Code set the standard for adequacy of light and air and for these reasons the above criterion is satisfied. FWCC 20-2(5): Provide for water, sewage, drainage, parks and recreational areas, sites for schools and school grounds and other public requirements: 11. As noted in the Findings of Fact, the project is served by adequate infrastructure in order to properly serve new residents as well as to prevent degradation of current services to existing residents of the area. FWCC 20-2(6): Provide for proper ingress and egress: (PA0721500.DOC; 1/13041.15oo17l} Preliminary Plat Recommendation p.1O Findings, Conclusions and Recommendation 18 12. According to Staff, access to all lots will comply with City design standards. The improvements to 28th Avenue South and the creation of the internal roadway loop will aid in available safe access to the subject property. FWCC 20-2(7): Provide for housing and commercial needs of the community: 13. At the proposed densities, project satisfies the above criteria. FWCC 20-2(8): Require uniform monumenting of land divisions and conveyance of accurate legal descriptions: 14. FWCC 20-11l(b) requires that the survey of the proposed subdivision must be made by ,or under the supervision of a registered land surveyor who shall certify that it is a true and correct representation of the land surveyed. This and other requirements like it help ensure that the objective of uniform monumenting of land divisions and accurate legal descriptions are satisfied. FWCC 20-2(9): Protect environmentally sensitive areas: 15. As noted previously, the project has gone through a review under the State Environmental Policy Act, which ensures that all environmentally sensitive areas are protected and mitigated. No appeal has been filed in regards to the SEP A determination, and although concerns regarding the significant trees and steep slopes have been raised, they do not qualify as environmentally sensitive areas. In addition, further review of the engineering site plan would take place prior to construction or final approval of the plat. FWCC 20-2(10): Provide for flexibility and. site design to accommodate view enhancement, protection, protection of streams and wetlands, protection of steep slopes and other environmental significant or sensitive areas. 16. Any development of the site will have to comply with the City's critical areas ordinance, which ensures adequate protection of environmental resources. As conditioned, the project also minimizes disturbance of vegetation and slopes that are not protected by the critical areas ordinance. The criterion is satisfied. FWCC 2O-12S(c)(S): It is consistent with the development standards listed in FWCC 20-151 through 20-157, and 20-178 through 20-187. 17. As noted in the staff repOlt, the subdivision complies with all standards identified above. The staff report does not find compliance with applicable clearing and grading requirements (most notably FWCC 20-179), but as conditioned the Examiner does find compliance. RECOMMENDATION The Examiner recommends approval of the preliminary plat application, subject to the conditions of approval recommended by staff and the following: 1. Cleating and grading at the subdivision stage of development is limited to the extent {P A0721500.DOC; 1113041 .150017/1 Preliminary Plat Recommendation p.ll Findings, Conclusions and Recommendation 19 necessary to ensure: (a) gravity discharge to the detention facilities proposed by the applicant; (b) that all proposed lots are buildable; and (c) that the lots and improvements can be located and configured as proposed. Buildable lots are defined as lots that can accommodate a home with at least a 2,500 square foot footprint and still comply with all applicable regulations, including critical area regulations. Dated this 3rd day of March, 2009. I BFP699241.DOC;1I13041.1S0010l) Preliminary Plat Recommendalion ~ ,..~ /. . .~ Phil Olbrechts Hearing Examiner City of Federal Way p.12 Findings, Conclusions and Recommendation 20 .,.... ~ QJ .. ~~ ~ 00 21 I lIIiiiiIII l! CD a" Ef ~ 0.. CO ~ >. ......, .- C .... 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QJ ..= QJ ~ CJ == .... = .- "'0 ~ e QJ 0 = ~ ~ ~ ~ .- "'0 ~ 5 QJ QJ "Q ..= ..= = CJ ~ ~ .....- ~ ~ ~ ~ 1-1 ~ = 39 ~ ...... .- u = (JJ ~ 0 ...... .~ rIJ. 0 .~ ...... ~ 'e QJ ~ - = .. ~ QJ - = ~ .~ ~ 5 .. = OJ) C'd a = = ~ .- - ~ Q ~ .- (JJ 0 ...... = ...... ~ ef.) ...... ~ .- .0 = a = ~ ".... ~ .~ ~ .. = (JJ > e C'd ~ ~ Q e QJ ~ ..... J..c ".... Q.c ~ Q == OJJ ~ ~ .- u ..... = ~ = .- ~ ~ .- ~ ~ - = Q = ...... < -< z (JJ .- CJ == = . . . (JJ = ~ 0 ~. u 40 ~ CITVOf ~ Federal Way FILE COMMUNITY DEVELOPMENT SERVICES DEPARTMENT STAFF REPORT TO THE FEDERAL WAY HEARING EXAMINER STEEL LAKE CREST PRELIMINARY PLAT Federal Way File No. 07-103897-00-SU PUBLIC HEARING NOVEMBER 17, 2008 Federal Way City Hall City Council Chambers 33325 8tb Avenue South Federal Way, WA 98063 Table of Contents I. Project Information. ............................................................................... ............. ................... .... ........2 n. Consulted Departments and Agencies. .................. ............ ................. ................. ...... ...................... ..3 1lI. State Environmental Policy Act (SEP A).............. ..................... .............. ...........................................3 IV. Natural Environment............................................................... ......... .................... ..............................4 V. Neighborhood Characteristics .................. ........................................... ....... .............. ........... ...............6 VI. General Design... .............................. ........................... ............. .............. ............................................ 6 VIT. Transportation...... ........................ ........... ...... ........... .................. .......................... ..................... .........8 vrn. Public Services.............................. ............................................................................................. ........9 IX. Utilities............................. ................................................... ................ .............................. ..... ..........10 X. Analysis of Preliminary Plat Decisional Criteria .............................................................................11 XI. Findings of Fact ............. ... ...... ...... ............. ................................................................ ............ .... ......13 XII. Recommendation ... ........... .......... .............................. ....................... ...... ................................... ...... .15 XIII. List of Exhibits ............... ....... ................................ .............................. ............... ..................... .........16 Report Prepared by: Joanne Long-Woods, Senior Planner November 7,2008 41 ~.~ ~.~ File ~~j..Jt i -01-103897 -OO-SU Owners: Engineer: Surveyor: Action Requested: Relevant Dates: Staff Representative: Steel Lake Plat Group: Verlin & Linda Elder Al W oida, Mike & Gloria Trinidad 30642 28th Avenue South Federal Way, VVA 98003 Brant Schweikl, PE Schweikl & Associates, PLLC 705 South 9th Street, Suite 303 Tacoma, W A 98405 Tim Ingraham, PLS True North Land Surveying, Inc. 815 South Weller Street, Suite 200 Seattle, W A 98104-3023 The applicant is seeking preliminary plat approval of a 28-lot single-family residential housing development pursuant to Federal Way City Code (FWCC) Chapter 20, "Subdivisions," Section 20-110, Division 9, "Preliminary Plat." Preliminary Plat Application Filed: Application Determined Complete: Notice of Application Published: SEP A Issued: July 16, 2007 August 3, 2008 August 11, 2008 October 4, 2008 Joanne Long-VVoods, Senior Planner, 253-835-2640 Staff Recommendation: Denial of the Proposed Preliminary Plat I. PROJECT INFORMATION A. Decision Requested - The preliminary plat application is subject to a public hearing by the Hearing Examiner, recommendation to the City Council, and decision by the City Council. An analysis of the applicable preliminary plat decisional criteria, findings, and recommendations is provided under Sections X, XI, and XII of this report. B. Description of the Proposal- The applicant proposes to subdivide approximately 6.77 acres into 28 lots for establishment of a single-family residential housing development with public streets, sewer, and water services. Transportation improvements will include half-street frontage improvements and dedication of 9 feet of additional right-of-way along 28th Avenue South, an intemalloop roadway with curb, gutter, and sidewalks. Approximately 1.61 acres will be dedicated to public right-of-way and .61 acres will be allocated for storm drainage facilities (18,449 sq. ft.), landscaping tracts along 28th Avenue South and Military Road South (4,561 sq. ft.), and an eight-foot-wide pedestrian pathway that runs along the northeast edge of the plat to Military Road South. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897-OO-SU/Doc. J.D. 47633 Page 2 42 C. Property Description - The subject site, which consists of four parcels for a total of 6.77 acres, is a rectangular parcel, approximately 573.24 feet wide by 390.57 feet deep, with frontage onto 28th Avenue South to the west and the Interstate 5 right-of-way and Military Road South to the east. There are currently three single-family residences, a shed, barn, anda swimming pool on the four lots. All Structures will be demolished and removed from the property. D. Location - The site is located in the central portion of the City, south of 304th Street and east of 28th Avenue South in the NE Y4 of Section 9, T21N, R4E, W.M. E. Assessor's Parcel Numbers - Parcel Nos. 0921049182, 092109183, 0921049096, and 0921049161. F. Site Access - The lots within the plat will be accessed through an intemaIloop road off of 28th Avenue South. G. Land Use, Zoning and Comprehensive Plan Designation DIRECTION ZONING COMPREHENSIVE PLAN EXISTING LAND USE Site RS-7.2 SF - High Density Residential 3 houses, barn, shed, and a swimming pool North RS-7.2 SF - High Density Residential SFR South RS-7.2 SF - High Density Residential SFR East None None Interstate - 5 ROW West RS-7.2 SF - High Density Residential SFR II. CONSULTED DEPARTMENTS AND AGENCIES The following deparbnents, agencies, and individuals were advised of this application. A. Community Development Review Committee (CDRC), consisting of the Federal Way Community Development Services Planning and Building Divisions; Public Works Engineering and Traffic Divisions; Parks Recreation and Cultural Resources Department; South King Fire and Rescue; Lakehaven Utility District; and Federal Way Public Schools. CDRe comments have been incorporated into this report where applicable. B. All property owners within 300 feet of the site were mailed notices of the application as required by the Subdivision code, as well as the Mitigated Determination of Non significance (MDNS) as required by the State Environmental Policy Act (SEP A) and FWCC Chapter 18, "Environmental Protection." The site was also posted and notices published in the newspaper and on the City's official notice boaids. Four comment letters were submitted in response to the August II, 2007, Notice of Application. Two of the letters had return addresses on them, and two were submitted as anonymous comments. Following revisions to the preliminary plat application, the City responded to the parties that provided comments on the design of the plat on October 28, 2008, and November 4, 2008. III. STATE ENVIRONMENTAL POLICY ACT (SEP A) A. The City of Federal Way issued a Mitigated Environmental Determination ofNonsignificance (MDNS) for the proposed action on October 4, 2008. This determination was based on review of information in the project file, including the environmental checklist and staff evaluation of the Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897-00-SU/Doc ID. 47633 Page 3 43 environmental checklist for Steel Lake Crest Preliminary Plat, resulting in the conclusion that the proposal would not result in probable significant adverse impacts on the environment. B. The comment period for the MDNS concluded on October 20, 2008. One comment letter was received in response to the environmental determination. The City replied to this comment letter dated October 20, 2008. The applicant provided a response to the MDNS as well. The appeal period ended on November 3,2008, with no appeals to the City's environmental decision. The environmental decision is incorporated as though set forth in full. IV. NATURAL ENVIRONMENT A. Soils - The Subsurface Exploration and Geotechnical Engineering Report, prepared by Jason Engineering & Consulting Business, Inc, and dated June 20, 2007, stated that "the western portion ofthe site consisted of Alderwood gravelly sandy loam (AgB) soils. Typical Alderwood soils are moderately well drained, lDldulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands and terraces formed lDlder conifers in glacial deposits. These soils are nearly level and moderately well drained. Water moves across the substratum in winter. Areas are irregular in shape and slopes range from 0 to 6 percent. Runoff is slow and the erosion hazard is slight. The geology of the eastern portion of the site consists of Alderwood gravelly sandy loam (Age). Soil profiles are similar in type except permeability is moderately rapid in the surface layer and subsoil. However, it is very slow within the cemented layer and dense glacial till. A perched water table is as high as 18 to 36 inches at times from January through March. Runoff is slow to medium and erosion hazard is moderate." The property slopes gently from west to east. B. Topography, Slopes - The Technical Information Report & Preliminary Drainage Report states that the site naturally slopes from the southwest comer to the northeast comer. There is an approximate drop of 70 feet across the site, with an average slope of 9.3%. There are a few small areas where the average slope exceeds 40%. The majority of these steep slopes are near the existing houses that have slopes up to 40% and are the result of prior grading activities. The slopes on the south edge of~e site are typically 15% or greater. C. Vegetation - The geoteclmical report identifies existing vegetation as primarily deciduous trees with some large evergreen trees located on the east side of the property. There are also vine maples, cedar trees, blackberry bushes, and nettles. Preliminary plat applications are subject to submittal and approval of a tree retention plan and landscape plan pursuant to FWCC Section 20-186. City policy and FWCC Section 20-179 states that "existing mature vegetation shall be retained to the .maximum extent possible, with site 'clearing limited to plat infrastructure improvements, such as streets, drainage, utilities, usable open space, and related improvements. Retained significant trees located outside of plat infrastructure areas would be regulated lDlder FWCC Section 22-1568, "Significant Trees," and addressed at the time a building permit is applied for. That section further states that "lots created on slopes of 15% or greater shall minimize grading and shall not result in extensive use of retaining walls. Slopes are to be measured in their natural state." The applicant proposes to do mass grading on the site, resulting in the clearing, grading, and removal of a majority of the significant trees and other vegetation on site. There are over 200 Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897 -OO-SU/Doc.lD 47633 Page 4 44 trees on the site, but not all ofthemare considered "significant trees." A Landscape Plan (L-I) and Tree Retention Plan (L-2) were submitted by the Roper Company, last revised submittal was submitted on AugustA, 2008, but the plan was dated May 13, 2008. The plan and retention report identified that there are eighty seven (87) significant trees located on the subject site.! Pursuant to the provisions ofFWCC Section 22-1568, removal of more than 75 percent of the significant trees requires replacement in the amount of 25 percent of the existing significant trees. The applicant proposes to retain nineteen (19) of the significant trees and provide tree replacement through installation of three (3) replacement trees at the time of planting, and further proposes to plant eight (8) additional trees on some of the lots within the preliminary plat site. The proposal will just meet the minimum required percentage of tree preservation and replacement, but the mass grading project will remove most of the internal trees and a majority of the "trees on the east side ofthe parcel. As discussed in section VI.E, Grading, below, City staff is recommending denial of the proposed preliminary plat and the proposed mass clearing and grading of the site. D. Storm water Runoff-Development of the site will create additional runoff from new impervious surfaces such as streets, driveways, and rooftops. The storm drainage facilities are being designed in accordance with the J 998 King County Surface Water Design Manual (KCSWDM), which is currently adopted by the City. The subject site is required to meet the criteria for Level 1 Flow Control and Basic Water Quality standards as described in the 1998 KCSWDM. The Preliminary Technical Information Report (TlR), with Preliminary Drainage Review prepared by Schweikl and Associates, PLLC, dated July 2007 and revised May 2008 proposes to meet the requirements for flow control and water quality by utilizing a combined detention and wet pond, as allowed under the KCSWDM. E. Wildlife and Habitat - The applicant noted in the SEP A checklist that deer and songbirds exist on the subject property, that the planting of native vegetation on the site will enhance wildlife habitat opportunities, and that no threatened or endangered species are mown to be on or near the subject site. F. Steel Lake - Steel Lake is classified as a shoreline of the state and is located within 200 ft. of the proposed preliminary plat and is regulated by the FWCC, Section 18. Development projects within 200 ft. of a shoreline of the state are often required to apply for a Shoreline Substantial Development Permit, in addition to the underlying permit action. However, the applicant submitted a request to the Director of Community Development in 2007 for an exemption from the substantial development process stating that the potential impacts to the shoreline were very minimal as only the half street frontage improvements being required by the City and located at the northwest corner of the parcel was within 200 ft. of the shoreline. Of that area, 289 sq. ft., over half of the area would be paved dedicated right-of-way and most of the remaining area would be a landscaping buffer. The exemption was granted as requested on May 10,2007. G. Noise - The subject property is adjacent to the Interstate-5 right-of-way. The applicant was asked to submit a Noise Evaluation to determine impacts of noise from the highway on proposed residences. The applicant submitted the Environmental Noise Review, prepared by SSA I A significant tree is defined in the FWCC as a tree that is in good health, not detrimental to the conununity, and at least 12 i~ches in diameter 4.5 feet above the ground, not including red alder, cottonwood, poplar, or big-leaf maple. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-1 03897-00-SU/Doc ID. 47633 Page 5 45 Acoustics, LLP, dated June I, 2007. The review identified that the outside noise levels under HUD standards for residential development, should not exceed an Ldn of 65 dBA; without additional noise reduction incorporated into the construction. The testing done on the property identified that for the Day-Night Average Noise Levels measured in the area, the acceptable Ldn was higher than that recommended by HUD, therefore mitigation was required. The two options recommended to mitigate the noise from Interstate 5 were: 1) provide above- standard exterior envelope construction mitigation; or, 2) construct a noise barrier. The applicant contacted Washington State Department of Transportation to inquire whether there were any future plans to construct a noise barrier along this length of highway. The WSDOT staff person did not confirm any plans to build such a barrier. Therefore, in subsequent correspondence, the applicant identified a preference for incorporating noise reduction standards into the construction of future homes. The proposed mitigation by SSA Acoustics, LLPwas, therefore, incorporated into the mitigated SEP A determination. v. NEIGHBORHOOD CHARACTERISTICS A. Vicinity - The property is situated in the central portion of the City in an already developed single-family residential area. The site contains three older single-family residences, a shed, and a swimming pool. The properties are located south of 308th with 28th Avenue South bordering the west side and the Interstate 5 right-of-way corridor on the east side. Single-family residences border the property to the north, west, and south. There are many significant trees along the west side of the property, in the center and on the east edge. VI. GENERAL DESIGN A. Density- The total site area is 294,910 sq. ft, or 6.77 acres. Of that area, 61,290 sq. ft. will be dedicated to right-of-way and road improvements, 18,449 sq. ft. will be developed for storm drainage facilities, 4,561 sq. ft. will be developed into landscaping tracts, and 3,661 sq. ft. will be developed as a pedestrian pathway. Of the developable land, 4.75 acres, 2810ts could be built on the site of the proposed plat provided all other requirements of the FWCC are met. B. Lot Size - The underlying zoning is RS-7.2, which requires a minimum of 7,200 sq. ft. per lot. As shown on the preliminary plat map, Sheet PP1, prepared by Schweikl & Associates, lots range in size from 7,203 sq. ft. to 8,995 sq. ft. The land area excludes land set aside for roads, storm drainage pond, open space, and a pedestrian pathway. The plat meets the minimum standard necessary for lot sizes. C. Lot Layout - The lots are arranged around an internal loop road that accesses off of 28th Avenue South. There are six lots configured within the center of the road loop. All lots will access off of the internal road, with no direct access onto 28th Avenue South. An 8-foot-wide pedestrian pathway will be constructed along the north boundary of proposed Lot 28 and extend to Military Road South. The pedestrian pathway will be paved and will have lighting, landscaping, and a fence along the side. D. Parks & Open Space - FWCC 20-1 56(b) requires that 15% of the land be set aside for open space. Of the total land area for this plat, 44,236.5 sq. ft. is required to meet this requirement. The applicant is proposing to install a pedestrian pathway and three landscaping buffer areas, fOT Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897-00-SU/Doc J.D 47633 Page 6 46 a total of 8,223 sq.ft., leaving 36,013.5 sq. ft. remaining. The applicant proposes to pay a "fee in lieu of' for the remainder of the required open space, for a total of $50, 15 5 .12. The proposal was circulated to and approved by the Director of the City Parks Department. The fee will be required to be paid at final plat stage, based on the current assessed value of the land at that time. E. Subdivision Access and Roadway System - The plat will be accessed by a single access point off of 28th Avenue South and the lots will be accessed by an internal loop road. The applicant is being asked to dedicate an additional 9 feet of right-of-way along the east side of 28111 A venue South and construct half-street frontage improvements. F. Pedestrian System - The internal loop road in the plat will include curb, gutter, and sidewalks for pedestrian access throughout the plat. In addition, an 8-foot-wide paved pedestrian pathway will be constructed from the internal road in the northeast area of the plat that will follow the outside edge of the proposed storm drainage area and connect to Military Road South. The half- street frontage improvements will allow safer pedestrian travel along 28th Avenue South as there are no sidewalks along this area at this time; only a narrow paved area outside of a white line marked along the roadway, which is used by students travelling along the road to either a bus stop or path to their schools. G. Landscaping - The applicant's preliminary landscape plan provides landscaping as required by FWCC Chapter 20, "Subdivisions," and FWCC Section 20~ 186, "Landscaping protection and enhancement", including street trees along public roads and internal landscaped open space and common areas. As a recommended condition of preliminary plat approval, the applicant's final landscape plan shall be prepared in accordance with the preliminary plat conditions of approval and shall be submitted for the City's review and approval prior to issuance of engineering approval for plat improvements. FWCC Chapter 20 requires perimeter landscape buffers only when the plat abuts an incompatible zoning district. The proposed plat is bordered on two sides by single-family residential zoning; therefore, no buffers are required along the north and south boundaries of the plat. The applicant is required, however, to provide landscape buffers along an arterial street. Ten-foot landscaping buffers are provided in Tracts B & C along 28th Avenue South and a ten- foot landscaping buffer is provided along the side of Military Road South, adjacent to the exit of the pedestrian pathway. In total, 4,451 sq. ft. of landscaping will be provided in three separate tracts. Street trees and other vegetation will contribute to visual buffering along these areas. The applicant's Tree Retention Plan prepared by the Roper Company and dated May 30, 2008, indicates the location of existing significant trees, identification of trees to be preserved, and the location of replacement trees. The plan also identifies the remainder of other trees located on the property, most of which will be removed with mass grading of the site. The FWCC requires that 25% of the significant trees remain on site or be replaced with additional evergreen trees. Of the 87 significant trees, the applicant will remove 68 of them, leaving 19 trees, or 22%. In order to meet minimum requirements of the code, the preliminary landscape plan identifies that the applicant proposes to add eleven evergreen replacement trees, placed sporadically on some of the lots within the plat. H. Clearing, Grading - Pursuant to FWCC Section 22-179, all natural vegetation shall be retained on the site to be subdivided, except that which will be removed for infrastructure improvements or grading as shown on approved engineering plans. Existing mature vegetation shall be retained to the maximum extent possible. The effect of these provisions is that mass clearing and grading Staff Evaluation Steel Lake Crest Preliminary Plat File 07-I03897-00-SU/lloc J.D. 47633 Page 7 47 is not permitted. Only areas where infrastructure is required may be cleared prior to final plat approvaL Additionally, 20-179( c) states that "lots created on slopes of 15% or greater shall minimize grading and shall not result in extensive use of retaining walls. Slopes are to be measured in their natural state." The applicant proposes to do mass grading on the site, resulting in the clearing, grading, and removal of a majority of the significant trees and other vegetation on site. There are over 200 trees on the site, but not all of them are considered "significant trees." A Landscape Plan (L-1) and Tree Retention Plan (L-2) were submitted by the Roper Company, last revised submittal was submitted on August 4, 2008, but the plan was dated May 13, 2008. The plan and retention report identified that there are eighty seven (87) significant trees located on the subject site? Pursuant to the provisions ofFWCC Section 22-1568, removal of more than 75 percent of the significant trees requires replacement in the amount of25 percent of the existing significant trees. The applicant proposes to retain nineteen (19) of the significant trees and provide tree replacement through installation of eleven additional replacement trees at the time of planting on some of the lots within the preliminary plat site. The proposal will just meet the minimum required percentage of tree preservation and replacement, but the mass grading project will remove most of the internal trees and a majority of the trees on the east side of the parcel. The proposed subdivision is not consistent with the provisions ofFWCC 20-179 (a), (b), or (c). The applicant proposes to mass clear and grade the site. The preliminary grading plan shows significant cutting and filling in areas exceeding 15% slope. Retaining walls are not depicted, but based on the proposed plat grading plan, it is highly likely that extensive retaining walls would be proposed with home construction. VII. TRANSPORTATION A. Street Improvements - As proposed and as required by the FWCC, any required right-of-way dedication must be established through Statutory Warranty Deed to the City of Federal Way and all internal and external streets must be improved to meet all applicable FWCC street standards. The section for 28th Avenue South is a section 'K' and includes a 78-foot-wide right-of-way, 44- foot pavement width, vertical curb and gutter, six-foot planter strips, eight-foot-wide sidewalks, streetlights, and street trees,. Submitted plans demonstrate how the full street section can be constructed with an additional nine-foot ROW dedication. The approved internal roadway is a Type 'w' street and includes 28-foot pavement width, vertical curb and gutter, four-foot planter strips, five-foot-wide sidewalks, three-foot utility strip, streetlights, and street trees. A sight distance analysis was provided and reviewed by the City. An 8-foot-wide paved pedestrian pathway will be constructed from the internal road in the northeast area of the plat that will follow the outside edge of the proposed storm drainage area and connect to Military Road. The half-street frontage improvements will allow safer pedestrian travel along 28th Avenue South as there are no sidewalks along this area at thistime; only a 2 A significant tree is defined in the FWCC as a tree that is in good health, not detrimental to the community, and at least 12 inches in diameter 4.5 feet above the ground, not including red alder, cottonwood, poplar, or big-leaf maple. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897 -OO-SU/Doc. lD.47633 Page 8 48 narrow paved area outside of a white line marked along the roadway, which is used by students travelling along the road to either a bus stop or path to their schools. The City's Traffic Engineer reviewed the submitted plans and concluded that the proposed street layout of the Steel Lake Crest project is consistent with the adopted codes and comprehensive plan. B. Concurrency - Per FWCC Chapter 19, Article N, a concurrency pennit is required for the development. At the applicant's request, a concurrency analysis was performed by the City to determine whether there is adequate roadway capacity to accommodate the development and identifies traffic mitigation consistent withRCW 82.02. The staffreport of the Concurrency analysis identified 9 Transportation Improvement Plan (TIP) projects impacted by one or more PM peak hour trips resulting in $39,790.00 in pro-rata mitigation necessary to address any failures of the City's Level of Service (LOS) standard. The table below lists current TIP projects imp~cted by the proposed development and the appropriate pro-rata contribution. Prior to final plat approval, the applicant shall pay the project pro-rata share contribution in the amount of $39;790.00 to the City. 150 la City Center Access Phase 2 Design Study, Environmental analysis to $ 2,332.00 improve access to City Center 150 Ib City Center Access Phase 3 Add 2nd SB left-turn lane, 3rd SB right-turn $ 1,522.00 lane 150 Ic City Center Access Phase 4 Widen S 320th St bridge over 1-5, realign loop $ 7,864.00 ramp and NB off-ramp SR 99 HOY Lanes Phase 3: Add HOY lanes, 2nd SB left-turn lane @ 288th, 141 2 S 284th St - SR 509 install raised median, signal @ SR 509 @ $ 14,474.00 Redondo Wy S with interconnect to 11th PI S 139 10 S 320th St @ 20th Ave S Add 2nd left-turn lanes EB, WB $ 788.00 159 12 SR 99 HOY Lanes Phase 4: Add HOY lanes, install raised median $ 4,413.00 SR 509 - S 312th St 154 16 S 304th St @ 28th Ave S Add NB right-turn lane, signal $ 5,887.00 166 20 Military Rd S: S Star Lake Widen to 5 lanes, sidewalks, street lights $ 9,247.00 Rd - S 288th St 161 22 S 312th St@ 28th Ave S Add SB right-turn lane $ 1,494.00 48,021.00 8,231.00 VIII. PUBLIC SERVICES A. Schools - As part of the City's review of the proposal, the preliminary plat application and a School Access Analysis was prepared by Schweikl & Associates, dated May 8, 2007 and was submitted to the Federal Way School District for r:eview. According to District comments the Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897-00-SU/Doc ID. 47633 Page 9 49 proposed development will generate approximately 20 to 21 additional school aged children. The site is located in the service areas for Wildwood Elementary, Sacajawea Middle School, and Federal Way High School. The elementary and middle school students would be required to walk to bus stops along 28th Avenue South, located at 310th Street and 311 th Street, respectively. The Federal Way High School students would be required to walk to school from this development. School service areas are reviewed annually and may be adjusted to accommodate enrollment growth and new development. School impact fees, as authorized by City ordinance and collected at the time of building permit issuance, are currently $3,883.00 (plus a $194.00 City administrative fee) per single-family housing unit. School impact fees are determined on the basis of the District's Capital Facilities Plan and are subject to annual adjustment and update. B. Parks & Open Space - The applicant is proposing to install a pedestrian pathway and three landscaping buffer areas, for a total of 8,223 sq.ft., leaving 36,013.5 sq. ft. remaining. The applicant proposes to pay a "fee in lieu of' for the remainder of the required open space, for a . total of $50,155.12. The proposal was circulated to and approved by the Director of the City Parks Department. The fee will be required to be paid at final plat stage, based on the current assessed value ofthe land at that time. C. Fire Protection - South King Fire and Rescue requires that a hydrant be located on the east end of the plat. Fire hydrants must be spaced 600 ft. or less apart. Every building lot shall have a fire hydrant within 300 ft. and all measurements must be made as vehicular travel distance. All hydrants shall be in service prior to and during construction. A Certificate of Water Availability from Lakehaven Utility District indicates that water will be available to the site in sufficient quantity to satisfy fire flow standards for the proposed development. IX. UTll..ITIES A. Sewage Disposal- The applicant proposes to serve the proposed plat by a public sewer system managed by Lakehaven Utility District. A May 2007 Certificate of Sewer Availability indicates the district's capacity to serve the proposed development through a Developer Extension Agreement (DEA) between the applicant and the district. However, the applicant has since had to reapply for the availability letter since the determination is only valid for one year from date of issuance. The applicant still needs to apply for the DEA. B. Water Supply - The applicant proposes to serve the subdivision with a public water supply and distribution system managed by the Lakehaven Utility District. A May 18, 2007, Certificate of Water Availability indicates Lakehaven's capacity to serve the proposed development through a Developer Extension Agreement (DEA). Again, the applicant was required to re-apply for the availability letter in 2008. The DEA is still required. c. Drainage Facilities - Development of the site will create additional runoff from new impervious surfaces such as streets, driveways, and rooftops. Storm drainage facilities are being designed in accordance with the requirements of Level 1 Flow Control and Basic Water Quality treatment of the 1998 KCSWDM, as modified by the City. The applicant's storm drainage Preliminary Technical Information Report (TIR), dated July 2007, revised May 2008, includes the Level I Drainage Analysis, which was reviewed by the City's Public Works Department. According to the TIR, stormwater runoff currently discharges towards the northeast corner of the site, and Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897-00-SU/Doc. J.D 47633 Page lO 50 enters a roadside ditch along the western edge of Military Road South, which then flows to the south, is then conveyed through a series of pipes under Military Road and Interstate 5, and eventually drains into Lake Dollof, which lies at the upper reaches of the Mill Creek drainage basin. Mill Creek eventually flows into the Green River, which eventually flows into Puget Sound. Preliminary design of the plat roadway and drainage systems indicates that stormwater runoff from the site will continue to discharge at the current, natural location. Additionally, a narrow strip of 28th A venue South, along the western edge of the project site, drains to the north and west into Steel Lake. Street improvements within 28th Avenue will increase the amount of irnpervious area that drains to Steel Lake. The increase in impervious area does not warrant additional flow control or water quality treatment facilities; however, the developer's engineer has agreed to install a small water quality treatment facility in the lowest downstream catch basin, if, during final engineering design that it is determined to be necessary. Stormwater design and plat drainage elements must conform to the standards, policies, and practices of the City of Federal Way's Public Works Development standards, and the City of Federal Way's Surface Water Management Division as outlined in the 1998 KCSWDM, the Comprehensive Suiface Water Management Plan, and the Storm water System Operation and Maintenance Manual. The approved storm drainage facilities must be constructed per City code requirements prior to final plat approval and recording of the subdivision. x. ANALYSIS OF PRELIMINARY PLAT DECISIONAL CRITERIA The FWCC establishes review procedures and decisional criteria for deciding upon various types of land use applications. Pursuant to FWCC Chapter 22, "Hearing Examiner's Decision," Section 22- 445; and pursuant to FWCC Chapter 20, "Subdivisions," Section 20-110; preliminary plat applications are submitted to the Hearing Examiner for public hearing. The preliminary plat application and the recommendation of the Hearing Examiner are submitted to the City Council for approval or disapproval. Hearing Examiner Preliminary Plat Decisional Criteria - Pursuant to FWCC Section 20-126( c), the Hearing Examiner may recommend approval of the proposed preliminary plat only if the following decisional criteria are met. Decisional criteria and staff responses are provided below. 1. The project is consistent with the comprehensive plan. Staff Comment: The application is subject to the adopted Federal Way Comprehensive Plan (FWCP), which designates the property as Single-Family - High-Density. The proposed land use of a Single-Family housing development is permitted is consistent with density allowances and policies applicable to this land use as established in the FWCP. However, the application is NOT consistent with Chapter 9.3 of the Comprehensive Plan, "Geologic Hazardous Areas. " Goal NEG9 states: "Adopt standards to ensure against the loss of both public and private property in geologically hazardous areas. " In Policy NEP55 of that Chapter, it further states: "as slopes increase, development intensity, site coverage, and vegetation removal should decrease and thereby minimize drainage problems, soil erosion, siltation, and landslides. Slopes of 40 percent or more should be retained in a natural state, free of structures and other land surface modifications. "The proposed design of this plat does not adhere to either the goal or policy of that chapter ofthe comprehensive plan. 2. The project is consistent with all applicable provisions of the chapter, including those adopted by reference from the comprehensive plan. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-1 03897-00-SU/Doc.I.D. 47633 Page }I 51 Staff Comment: The preliminary plat application is required to comply with the provisions of the FWCC Chapter 18, "Environmental Policy"; Chapter 20, "Subdivisions"; Chapter 22, "Zoning"; and all other applicable codes and regulations. As proposed, to mass grade the site and create lots that require extensive grading on slopes exceeding 15% does not comply with the provisions of Chapter 20, "Subdivisions", Section 20-179, "Retention of Vegetation." The applicant has identified that some areas have slopes up to 40%, some of which were created during grading for the existing homes. The grading and clearing plan shows significant cuts and fills but does not disclose where retaining walls would be placed to create buildable lots for the homes. For these reasons, the proposed subdivision does not meet the criteria of the codes listed. 3. The project is consistent with the public health, safety, and welfare. Staff Comment: The proposed eo~ 11Vu&;Jl~ preliminary plat would permit development of the site consistent with the current Single-Family High-Density land use classification of the FWCP and map. Proposed access and fire hydrant locations must meet all requirements of South King Fire and Rescue, and all future structures are required to be sprinkIered. Future development of the plat in accordance with applicable codes and regulations will ensure protection of the public health, safety, and welfare. 4. It is consistent with the design criteria listed in FWCC Section 20-2. Staff Comment: The proposed preliminary plat would promote the purposes identified in FWCC Section 20-2 and the standards and regulations therein, as identified in the staff report, including effective use of land, promotion of safe and convenient travel on streets, provision for the housing needs of the commurtity, protection of environmentally sensitive areas, and preservation of a portion of the site as common open space. As proposed, and with conditions as recommended by City staff, the preliminary plat application complies with all provisions of the chapter. 5. It is consistent with the development standards listed in FWCC Sections 20-151 through 157, and 20-158 through 187. Staff Comment: As proposed, the preliminary plat application does not comply with all applicable statutes, codes, and regulations. The proposed mass grading of the site will allow: · Extensive grading on slopes over 15%; · Clear and grade outside o~proposed infrastructure improvement areas; · Is not consistent with the requirements of Section 20-179 of the Code. Planning and Public Works staffhave met with the applicant to discuss these issues. Public Works staff offered suggestions on how to revise the layout and design of the plat in order to minimize the grading needed. Some of the suggestions were to: cluster development of houses in areas without steep slopes; eliminate some of the lots with the steepest slopes within the interior of the loop road and use that area for development of the required open space area; increase lot sizes; adjust road grades; or do as the code requires, to only grade the individual lots at building permit stage. The applicant has chosen to proceed without implementing any of these ideas. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-1 03897-00-SU/Doc.1D. 47633 Page 12 52 XI. FINDINGS OF FACT Based on an analysis of the preliminary plat application, environmental record, and related decisional criteria, the Department of Community Development Services finds that: 1. The proposal is to subdivide 6.77 acres into a 28-10t single-family residential housing development project. 2. The proposed single-family residential subdivision is consistent with existing Federal Way zoning and comprehensive plan designations for the RS-7.2/Single-Family High-Density zoning district. 3. City staff received and responded to written comments received from neighbors regarding potential impacts on the neighborhood from increased traffic and removal of significant trees. The comments were considered in the environmental determination on the project. 4. A Mitigated Environmental Determination ofNonsignificance (MDNS) was issued for this proposed action on October 4, 2008, based on the Staff Evaluation of Environmental Checklist. One comment letter was received regarding the proposed development. No appeals ofthe environmental determination were filed with the City. 5. The preliminary plat was reviewed and determined to be consistent with most of the subdivision decisional criteria set forth in FWCC Section 20, including consistency with the comprehensive plan; consistency with the public health, safety, and welfare; and, consistency with the design criteria listed in FWCC Section 20-151-157; and many of the criteria in FWCC 20-176-185. However, because of the proposed grading of the site, it is not consistent with FWCC Section 20-179. 6. Lot sizes for the 28 housing parcels range from 7,203 square feet to 8,995 square feet, with an average lot size of7,39Csquare feet. This does not include areas set aside as landscaping tracts, dedicated rights-of-way, storm drainage facilities, open space, and the pedestrian pathway. 7. The applicant's proposed grading plan clears the majority of the site, including 78% of the 87 existing significant trees, in conjunction with installation of stormwater facilities and roadway and utility construction. Fifty-four significant trees are located on individuallo~ that would normally be preserved until building permit review stage. City staff does not support the proposed mass clearing and grading of the site due to the fact that a majority of the existing vegetation will be removed, slopes will be extensively regraded, and proposed houses in the center and north side of the proposed plat will likely require significant retaining walls to maintain slope stability. These aspects of the proposed plat are not consistent with FWCC 20- 179. Ifhowever, the Council approves the proposal as submitted, the plat will be subject to review of a final grading plan and subject to all conditions of preliminary plat approval. A TESC will be required as part of the engineering plan submittal to eliminate erosion and aesthetic Issues. 8. The applicant's significant tree inventory indicates that nineteen (19) significant trees will be retained within the proposed grading limits. The 19 plus 11 mOre evergreen replacement trees are proposed to be installed sporadically on some of the lots within the plat. Landscaping will be provided along main roads and in conjunction with development of COmmon open space areas. 9. The development proposes to install more vegetation in some common open space in the planting strip along the intemalloop road. The privately maintained open space includes a Staff Evaluation Steel Lake Crest Preliminary Plat File 07- I 03897-00-SU/Doc_I_D_ 47633 Page 13 53 landscaped pedestrian corridor, and landscaping buffers along 28th A venue South and Military Road South. The proposed housing development is subject to review of final landscape plans as a condition of preliminary plat approval. 10. The applicant submitted a concurrency application that was processed by the City's Traffic Engineer. The report found that the proposed development will impact 9 of the City's Transportation Improvement Plan (TIP) projects with one or more PM peak hoUr trips, and as a result, $39,790.00 in pro-rata mitigation must be paid to address any failures of the City's Level of Service (LOS) standard prior to final plat approval. City staff concurs with this mitigation as-a recommended condition of preliminary plat approval. 11. Vehicular access into the housing development will be available off of 28th Avenue South. Plat layout provides for good vehicle and pedestrian circulation in accordance with all applicable right-of-way improvement requirements. In accordance with the FWCC, all street improvements along 28th Avenue South must be dedicated and improved to current street standards, while landscaping improvements along Military Road South adjacent to the paved pedestrian pathway. The internal driveway width of 28 feet is satisfactory for the housing development. The City's Traffic Engineer has reviewed the project and concluded that the proposed street layout is consistent with the adopted codes and comprehensive plan in place at the time of the complete application. 12. Prior to final plat approval, traffic mitigation in the amount of $39.790 shall be paid to the City. 13. The applicant provided a school access analysis that indicates that the site will generate between 20 to 21 new school students that will be served by Federal Way High School, Wildwood Elementary School, and Sacajawea Middle School. High school students from the plat will be required to walk to school. Elementary and middle school students will be bused from existing nearby stops, or new and additional stops as the district may determine appropriate for the conditions. School impact fees will be assessed and paid to the School District with individual building permits. 14. Design and construction of surface drainage facilities in accordance with the 1998 KCSWDM and recommended conditions of preliminary plat approval, will ensure that all potential erosion, surface water runoff, water quality, and infiltration/storage-related impacts are addressed. The applicant's TIR was reviewed and accepted by the City's Public Works Department subject to final engineering review. Storm drainage facilities generally consist of infiltration trenches, pervious pavement, and a storm drainage pond. 15. The preliminary plat application was reviewed for consistency with all applicable state and local codes, policies and regulations, including the Federal Way Comprehensive Plan (FWCP); Federal Way City Code (FWCC) Chapters 18, "Environmental Policy"; 19, "Planning and Development"; 20, "Subdivisions"; 21, "Surface and Stormwater Management"; Chapter 22, Article IV "Improvements"; Article XVII "Landscaping,"; the 1998 King County Surface Water Design Manual; and Federal Way Development Standards. As proposed and recommended by staff, the preliminary plat is NOT consistent all elements of the Comprehensive Plan, specifically, Chapter 9.3, 'Geological Hazardous Areas", Goal NEG9, and Policy NEP55 as outlined above; and, the proposed plat in NOT consistent with the FWCC, specifically Section 20-179. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-1 03897-00-SU/Doc.LD. 47633 Page 14 54 16. Water and sewer fa~ilities are available from Lakehaven Utility District and are adequate to serve the proposed developrnent. It is the applicant's responsibility to secure all necessary water and sewer services from the utility provider. XII. RECOMMENDATION Based on review of the applications, environmental record, and pertinent decisional criteria, the Department of Community Development Services recommends that the Hearing Examiner recommend DENIAL of the preliminary plat. If, however, the Examiner chooses to recommend approval, City staff recommends the following conditions be attached to such approval: 1. Prior to the City's approval of engineering plans, the applicant shall provide a detailed design for clearing and grading for the entire site. The applicant may be required to provide additional bonding or maintenance provisions for methods not currently approved by the 1998 KCSWDM. 2. Final plat approval shall require full compliance with drainage provisions set forth in the FWCC. Compliance may result in reducing the number and/or location of lots as shown on the preliminary approved plat. Final storm drainage engineering plans shall comply with the following: a. Drainage plans and analysis shall comply with the 1998 KCSWDM and amendments adopted by the City of Federal Way. City of Federal Way approval of the drainage and roadway plans is required prior to any construction. b. The combined detention and water quality facility shall be designed to the Level I Flow Control and basic water quality treatment criteria of the 1998 KCSWDM, as amended by the City of Federal Way. Final review of the storrnwater quality and detention facility will occur in conjunction with plat engineering review. 3. Prior to the City's approval of engineering plans, the applicant shall strive to reduce the quantity and overall height of any proposed retaining walls or rockeries. Approved retaining walls or rockeries associated with plat construction shall reflect residential housing, scale, design, and sensitivity of materials or treatment, including use of texture, vegetation, and terracing. If there are retaining walls added to the preliminary plat drawings that were not shown on the original drawings presented to the City Council for approval, the applicant shall be required to submit the revised drawings to the Community Development Department for a modified plat approval process through the Council. 4. Prior to final plat approval, the final plat drawing shall dedicate all common open space in open space tract(s) to be owned in common and maintained by property owners of the proposed subdivision, and shall prohibit removal or disturbance of vegetation and landscaping within the tract, except as necessary for maintenance or replacement of existing plantings and as approved by the City. A note shall be included on the final plat map that the open space tract shall not be further subdivided, rnay not be developed with any buildings or other structures except as may be approved by the City for recreational purposes only for the benefit of the homeowners, and may not be used for financial gain. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-1 03897-00-SU/Doc.1.O. 47633 Page 15 55 5. If the mass clearing and grading of the plat is approved, and the appli<:;ant proceeds to clear and grade the site, the applicant shall: a. Stabilize the site in accordance with Best Management Practices; and, b. Provide a written commitment to make every effort to commence house construction within two months of Final Plat approval; and, c. Provide an estimate of the gross value of harvest able timber on the site. Ifhome construction is not started within 2 months of final plat approval, a fee equal to the amount of the gross timber value shall be paid to the City by the owner of the plat. XIll. LIST OF EXHmrrS A. Preliminary Plae A-I - Topographic Survey, prepared by Schweikl & Assoc., PLLC, May 30, 2008 A-2 - Preliminary Plat - prepared by Schweikl & Assoc., PLLC, August 4, 2008 - PP 1 & PP-2 A-3 - Existing Conditions - prepared by Schweikl & Assoc., PLLC, May 30, 2008 - E-l A-4 - Preliminary Grading Plans - prepared by Schweikl & Assoc, May 30, 2008 - Gl & G2 A-5 - Channelization Plan - prepared by Schweikl & Assoc., May 30, 2008 - CH-l B. Landscape Plans prepared by The Roper Company, Inc., August 4, 2008 B-1 - Conceptual Landscape Plan - Ll.l B-2.. Tree Retention Plan - L1.2 C. Vicinity Map D. NOA Comment Letters Received Following Notice of Application D-l - H. David Kaplan D-2 - Douglas Freimuth E. City Responses to D-2 F MDNS Issued October 4, 2008 G. Staff Evaluation with SEP A Checklist H. SEP A Comment Letters H-l - H. DavidKaplan H-2 - Brant Schweikl, Schweikl & Associates 1. Responses to SEP A comments, H-l and H-2 J. Subsurface Exploration & Geotechnical Engineering Study, Jason Engineering & Consults, May30, 2008 K. Environmental Noise Review, SSA Acoustics, LLP, June 1,2007 L. Civil Reports by Schweikl & Associates, PLLC L-l - Preliminary Technical Information Report (TIR), & Drainage Report Addendum, June 2008 M. Response to School Access Analysis by School District N. School Access Analysis, March 31, 2008 O. Certificate of Sewer Availability P. Certificate of Water Availability Q. Site Distance Report R. Response of Community Development to Shoreline Exemption Request S. Request of Applicant for Shoreline Exemption TRANSMIITED TO mE P .4Rl1ES LISTED HEREAFTER: Federal Way Hearing Examiner Applicant - Steel Lake Plat Group Project Engineer - Brant Schweikl, Schweikl & Assoc, PLLC, 705 South 9th Street, Ste 303, Tacoma, W A 98405 Federal Way Staff - Joanne Long-Woods, Kevin Peterson, Sanjeev Tandle, William Appleton 3 Exhibit A-D: Full size plan set to the Federal Way Hearing Examiner. Staff Evaluation Steel Lake Crest Preliminary Plat File 07-103897-OO-SU/Doc \.0.47633 Page 16 56 I ! a- ill a ~1!.~~~:::illf;i;I~ll:~ ~ iUUdhn~i UU5 IIZ.Q'.BOO~''''@J11,1,a I · i . I iI! ~. I ~ :)1 - lJq I · )It R! b I ,-, i ~ )It b~ ~ "5:bl II ~ ~ b~ Ii i i! f~. :~f~ II' .Ii Jb ~ ~m bli 'l I I Ub :11 ;i:i f:! !U; a i. ~If b i!li 1II~ 1II$~ b~1 ~ at ~ rl~~ !;~ ~I~ ,~~~ I' : fti!l'@ illll illll. !l~I!" b ~b'! ~~ 1m bill; I' ! ,I:; ~ Iii 1m d:!!if!; _ !Iii I . . 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II Steel lake Preliminary Plat File #07-103897-SU Parcels 092104 9182 0921049183 092104 9096 0921049161 800 . o 66 nHIBIT~ PA E - -. --.....'-' '-'I \;;~l. r=...I"\,..... L. :-M___ _4 . . Steel lake Crest From: h.Cfavid kaplan (hdk1i ~hotmail.com) Sent: Wed 8/15/074:44 PM To: HDavid Kaplan (hdk1934@hotmail.com) RECEIVED BY COMMUNITY DEve' ~QMeNT DEPARTMeNt AUG 17 Z007 From: hdk1934@hotmail.com To: kathy. mcclung@cityoffederalway.com; deb. barker@cityoffederalway.com; hdk1934@hotmail.com Subject: Date: Wed, 15 Aug 2007 16:21:38 -0700 I have reviewed the Preliminary Plat documents for Steel Lake Crest Preliminary Plat and have one major concern. The city's evaluation of this project, as designed, has an unacceptable site distance looking south on 28th Avenue South from the North Access Drive. I live on 27th Avenue South, just North of 304th, and drive 28th Avenue South virtually every day. I know that the hill facing the proposed plat Is something of a speedway, both Northbound and I Southbound. The proposed center turn lane along the length of the project doesn't solve the site distance problem. If the project were built as designed, there would be a bunch of accidents waiting to happen. What solution(s) are the city proposing? Please consider this e-mail a written comment on the Notice of Land Use Application, as published in the August 11 Issue of the Federal Way Mirror. If you need to contact me, my phone number is (253) 941-3819. Th.nky'".r:ff_~<k ~ H. David Kaplan 30240 27th Avenue South Federal Way, WA 98003-4212 EXHIBIT D:-\ PAGE--l-OF ---L. 67 ,","'lVUVIUlm J ueVI:Lut'MtN I UI:I"AHI MtN I AUG 2 2 2007 21 August 2007 TO: Director of Community Development Services City of Federal Way SUBJECT: Notice of Land Use Application Steel Lake Crest Preliminary Plat My wife and I own the property directly across 28th Ave. So. (30615 28th Ave. So.) that has the longest front footage that faces the proposed plat. We purchased our home 30 years ago when it was approximately 2 years old. At the time, it was sold as an "executive" home with approximately 2500 square feet and a beautiful view of Steel Lake. We were in a rural part of unincorporated King County where our neighbors had fann animals (Le. horses, chickens, etc.). Traffic on 28th Ave. So. was relatively minor. During the 30 years we have lived here we have sadly watched the road get busier and busier every year to the point where there is a constant stream of traffic that makes it extremely noisy and, at times, almost unsafe to merge into it in order to exit our home. The obvious lack of growth management which, by the way, I remember as being one of the campaign reasons Federal Way should become a city, has, in my opinion,. caused much of the congestion that plagues this city. When people ask me where I live I tell them I live in a suburb of Seattle, hoping they won't ask the name of the city because I'm embarrassed to say Federal Way. From my observations there are now 4 homes and lots of trees that will become 29 homes and, if they do what they normally do, no trees. This area, as it now exists, at least has some scenic beauty and is a noise buffer to Interstate 5. In the "Description" you state "The project includes street improvements, construction of storm drainage facilities, and utility improvements". What kind of "street improvements" do you mean? Do you plan to make 28th Ave. So. a 4 lane road by widening it so that it will be touching the edge of my garage? There is no logical way you can "improve" 28th Ave. So. other than to reduce the volume of vehicle traffic using it. Do you plan to put a stop light on 28th Ave. So. so these new home owners can enter and exit their property without getting broadsided? If you do that, 28th Ave. So. traffic will stack up at the stop light which will further congest the road and the rest of us will never be able to enter the road. If the "street improvement" is to repave the road or to maintain the road aren't those things that are already being done? I firmly believe that somebody needs to look at this, not from the standpoint of a developer looking to make a buc~ but from the standpoint of the citizens of Federal Way, especially those of us that live in close proximity to it. EXlilBIT D--~ PAGE--1-0F ~ 68 To show you how serious I am about this issue, I will retract this letter if somebody will pay me the fair market value for my home. As a matter of fact, I will sell my home immediately and vacate it within 30 days even if it means putting all my possessions in storage. People have told me that I am wasting my time writing this letter since nobody will probably even bother to read it and, if they do, nobody cares or will do anything anyway. They may be right, but I look at it like an election, it's harder to complain about the results if you didn't bother to vote. ?lilY, .~ Do~imuth EXHIBIT t>..~ PAGE~OF ~ 69 .~ Federal Way i - (U) I LJ) \V / CITY HALL \~ ~ U U 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway.com November 6, 2008 Mr. Douglas Freimuth 30615 28th Avenue South Federal Way, WA 98003 RE: File #07-103898-0O-SE; REsPONSE TO COMMENTS Steel Lake Crest Preliminary Plat, 30642 28th Avenue South, Federal Way Dear Mr. Freimuth: I am a Senior Planner with the City of Federal Way and have been given the above-referenced case to take through the public review process. I am writing in response to comments you submitted on this project when the Notice of Application was published in 2007. At that time, staff copied and distributed those comments to the Public Works Dept. and the applicant's engineer for evaluation and response. Your concerns were basically about the increase in traffic on 28th Avenue South and the potential need to widen the road to four (4) lanes. I would like to make sure that you understand the current status of the proposed plat. This plat configuration has gone through a few design changes over the past year. As you mayor may not know, the present right-of-way width on 28th Avenue South is 60 feet. City Code does not require 28th Avenue South to be widened to four lanes, as you had suggested. However, the Public Works Dept. has determined that the applicant will be required to dedicate nine additional feet of right-of-way on the east side of 28th Avenue to provide half-street frontage improvements along the face of the plat. Also, to meet sight distance requirements, the Traffic Division has required that the northerly entrance to the plat be eliminated because there was not adequate site distance at that location and there is now only one entrance into the plat, at the south end of the property. As an adjacent property owner, you should have received both a notice of the Mitigated Determination of Nonsignificance (MONS) issued for this plat and a notice that the plat has recently been scheduled for a public hearing before the Hearing Examiner at 11 :00 AM on November 17, 2008. If you attend the hearing, you will be able to voice your concerns before the Examiner or you are entitled to submit additional written comments to the Examiner as stated in the notice for the public hearing. I hope this additional information helps you understand how the plat design has changed and why. If you have any questions, please contact me at 253-835-2640. ~~j}~ Joanne Long-Woods, AICP Senior Planner c: Brant Schweikl, Schweikl & Associates, PLLC, 705 South 9th Street. Suite 303, Tacoma, W A 98405 Linda Elder, 30642 28th Avenue South, Federal Way, W A 98003 EXHIBIT E PAGE--1-0F , 70 ~ CITY OF , '7 Federal Way MITIGATED ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE (MDNS) PRELIMINARY PLAT OF STEEL LAKE CREST File No: 07-103898-00-SE Description: Subdivision of 6.72 acres into 28 single-family residential lots. The project will include construction of an on-site stann pond; mass grading of the site with the movement of 17,821 cubic yards of cut, 17,821 cubic yards of fill, and 5,152 cubic yards of stripping; installation of landscaping tracts along 28th Avenue South and along Military Road; and an eight-foot wide paved pedestrian pathway from the internal road to Military Road. Access will be provided off of 28th Avenue and utilities will be provided by Lakehaven Utility District. The site is located in an area zoned Single-Family Residential-RS7.2, and designated High Density, Single-Family Residential in the comprehensive plan. Applicant: Steel Lake Plat Group, LLC 30642 28th Avenue South Federal Way, W A 98003 Location: 30642 28th Avenue South, Federal Way, WA-NE ~ Sec. 9, T21N, R4E, W.M. Tax Parcels: 0921049182,0921049183,0921049096, & 091049161 Lead Agency: City of Federal Way Staff Contact: Senior Planner Joanne Long-Woods, (253) 835-2640 The Responsible Official of the City of Federal Way hereby makes the following decision on this proposed development based upon impacts identified in the environmental checklist; a Subsurface Exploration and Geotechnical Engineering Report, prepared by Jason Engineering & Consulting Business, Inc. June 20, 2007; Technical Information Report, Preliminary Drainage Review for Steel Lake Crest, prepared by Schweikl & Associates, July 2007 and revised May 2008; Environmental Noise Review, prepared by SSA Acoustics, LLP, June 1,2007; Concurrency Analysis, City of Federal Way, October 2007; Federal Way Comprehensive Plan; Federal Way City Code; and other municipal policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the State Environmental Policy Act Rules (SEPA) pursuant to the Revised Code of Washington (RCW) 43.31C.060. The lead agency for this proposal has detennined that it does not have a probable significant adverse impact on the environment and an environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c), if the conditions listed below are met. This decision was made after review of a completed environmental checklist and other information on file with the City. Further information regarding this action is available to the public upon request at the Department of Community Development Services. Preliminary Plat of Steel Lake Crest Mitigated Determination ofNonsignificance (MDNS) 71 File #07-103898-OO-SE I Doc ID 46899 EXHIBIT ~ PAGE-LOF ...!L. FINDINGS OF FACT 1. The proposal is to subdivide 6.77 acres into 28 single-family residential lots. The proposal includes construction of a stormwater detention pond; installation of landscaping tracts along Military Road South and along 28th Avenue South; construction of a paved pedestrian pathway to Military Road South; mass clearing and grading of the site with approximately 17, 000 cubic yards of earth movement; removal of approximately 55 significant trees; and demolition of all existing structures. 2. The four parcels are in an area zoned RS 7.2, requiring a minimum lot size of 7,200 square feet. Parcels in the development range from 7,203 square feet to 8,995 square feet. The comprehensive plan designation in this area is High Density Single Family Residential. ') . 3. The project is located adjacent to the 1-5 right-of-way. Seven of the proposed lots, the detention pond, and part of the pedestrian pathway will be located adjacent to the 1-5. corridor. In accordance with code requirements, an Environmental Noise Study was conducted by SSA Acoustics, LLP on June 1, 2007. The noise study identified Housing and Urban Development (HOD) standards for noise levels outside and inside of residential housing. Specifically, the Department of Housing and Urban Development Noise Standards consider outdoor Day-Night Average Sound Levels (Ldn) below 65 dBA "acceptable" and the indoor Day-Night Average Sound Level (Ldn) goal is to not exceed 45 dBA. Normal construction can be expected to provide a Noise Level Reduction (NLR) of20 dB, thus the indoor goal of Ldn less than 45 dBA can be met when the outdoor Ldn is less than 65 dBA. The study identified that the Day-Night Average Noise Level (Ldn) ranged from 67 to 69 dBA. The hourly average noise levels exceeded 56 dBA during the entire four day noise monitor, with a maximum 24 hour Leq of 66 dBA and an average Leq of 62 dBA. The. exterior day-night noise levels exceed the recommended HOD guidelines; therefore, mitigation measures will be necessary. 4. Currently, there are 52 trees on the seven lots bordering the 1-5 corridor, 30 of these trees are significant trees. Twelve of the 52 trees will be saved and two will be replaced, for a total of 14 trees on the east boundary of the plat. In accordance with code requirements, the applicant submitted a Significant Tree Inventory with a Tree Replacement Plan to address the requirement of maintaining at least 25% of the significant trees on the site. The tree plan meets the minimum standards for tree replacement, but the function of providing any buffering from the noise and glare of lights from the interstate highway has been severely reduced. 5. The Subsurface Exploration and Geotechnical Engineering Report, prepared by Jason Engineering Inc., identified that in the process of boring test pits for soils analysis, buried debris was encountered in Test Pit #6, which corresponds to proposed Lots 4 and 5 of the preliminary plat. The scope of work did not entail an environmental assessment of the site and the test pit was a small bore to 8-10 feet only. The materials found in that area were old tires, building and/or wood debris, and fill materials. It is not known what the size of the buried debris area is or the exact content of thCil buried debris. Mitigation will be required to excavate and assess the area to determine whether any hazardous materials are found in the burial site and before the proposed mass clearing and grading takes place. 6. The "Final Staff EValuation. for Environmental Checklist, File No. 07-t63"89Y-00-SE" is hereby incorporated byreference as though set forth in full. ' I 0 }'~1 CONCLUSIONS OF LAw Federal Way's comprehensive plan policies adopted by Federal Way, and contained within the Federal Way Comprehensive Plan (FWCP), serve as a basis for the exercise of substantive SEP A authority to Preliminary Plat of Steel Lake crest Mitigated Determination of Non significance (MDNS) 72 File #07-I03898-OO-SE I Doc ID 46899 EXHISrr -i:e~_ PAGE 1. OF '.f approve, condition, or deny proposed actions applicable to potential adverse environmental impacts resulting from this project. The following components of the FWCP support the conditions for the development. NEG I: To preserve the City's natural systems in order to protect public health, safety, and welfare, and to maintain the integrity of the natural environment. NEP 1: Protect and restore environmental quality through land use plans, surface water management plans and programs, comprehensive park plans, and development review. NEP2: Preserve and restore ecological fimctions, and enhance natural beauty, by encouraging community development patterns and site planning that maintains and complements natural landforms. NEP3: To the maximum extent practical, the City's future actions will be consistent with the goals and policies of this chapter ofthe FWCP. NEP4: The City should work in concert with internal departments, state, and regional agencies, as well as with neighboringjurisdictions and tribes, to protect sensitive areas and the City's natural environment. NEG 12: Develop programs and/or regulations to address noise pollution in all areas of the City. NEP71: The City should develop and adopt construction standards to mitigate noise generated by SeaTac Airport and Interstate 5, as well as other major arterials. SEP A CONDITIONS Based on the above policies, the following mitigation measures are required to minimize identified potential significant adverse impacts: 1. Ifmass clearing and grading is approved for the preliminary plat as proposed, then the area of Test Pit #6 (proposed Lots 4 and 5), as identified in the Geotechnical Engineering Report, shall be excavated to determine the contents and extent of an identified debris burial. Ifhazardous or significant solid waste materials are discovered, then the applicant shall work with the King County Department of Solid Waste and the Washington State Department of Ecology to clean up the site and properly dispose of the debris before commencing the clearing and grading for the rest of the development site. 2. To meet HUD criteria for noise levels acceptable for residential development and to mitigate potential impacts of noise from Interstate 5 to the development and the surrounding community, the following mitigation measures are recommended by SSA Acoustics, LLP in the Environmental Noise Study conducted June 1,2007: a) Extef;or Construction Mitigation Standard construction methods that meet current energy code requirements provide a Noise Level Reduction (NLR) of20 dB, which is adequate for exterior Ldn levels that are 65 dBA or less. Since the exterior Ldn levels are above 65 dBA, additional construction methods are necessary to meet the interior Ldn of 45 dBA. To achieve the 45 dBA Ldn requirement, the exterior envelopes (walls, windows, doors) of the residential units must be constructed to provide a 25dB Noise Level Reduction (NLR). (See attached Table 2.) Preliminary Plat of Steel Lake Crest Mitigated Determination ofNonsignificance (MONS) 73 File #07-103898..oo-SE I Doc ID 46899 Page 3 EXHIBIT ~ PAGE. ~ OF-a. b) Noise Barrier Mitigation To provide noise barrier mitigation to meet the exterior noise level condition, and thus the interior noise condition, a noise barrier shall be constructed between Interstate 5 and the proposed residences. The goal is to reduce the outdoor noise level by 5 to 7 dB, resulting in a 62 to 64 dBA Ldn, which meets the HUD 65 dBA Ldn Exterior Noise Standard. In turn, the reduction of the outdoor day-night average noise level to 65 dBA or less with normal construction would result in an indoor day-night noise level of 45 dBA or less. The sound attenuation characteristics of a noise barrier are based on the geometry of the barrier relative to the source and receiver locations and the frequency of the source noise. . This MONS is issued under WAC 197-11-340(2). The lead agency will not act on this proposal for 14 days from the date below. Comments must be submitted by 5:00 p.m. on October 20, 2008. Unless modified by the City, this determination will become final following the above comment deadline. Any person aggrieved of the City's fmal determination may file an appeal with the City within 14 days of the above comment deadline. You may appeal this determination to the Federal Way City Clerk, no later than 5:00 p.m. on October 31,2008, by a letter stating the reason for the appeal of the determination. You should be prepared to make specific factual objections. Responsible Official: Greg Fewins Positionffitle: Director of Community Development Services Address: 33325 8th Avenue South, PO Box 9718, Federal Way, WA 98063-9718 Date Issued: October 4. 2008 Signature: A~ Preliminary Plat of Steel Lake Crest Mitigated Determination ofNonsignificance (MONS) 74 File #07-103898..QO..SE I Doc ID 46899 EXHIBIT (!"'4 PAGE~OFI CITYM ~ Federal Way DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES Final Staff Evaluation for Environmental Checklist Steel Lake Crest Preliminary Plat Federal Way File #07-103898-00-SE NOTE: The purpose of this Final Staff Evaluation is to provide technical staff evaluation of the proposed action; supplement information contained in the environmental checklist and expanded studies; provide technical information unavailable to the applicant; and correct inaccurate information and recommend measures to the Responsible Official to mitigate identified environmental impacts. Technical reports and attachments referenced herein and in the environmental checklist may not be attached to all copies of this. evaluation. Copies of exhibits, reports, attachments, or other documents may be reviewed and/or obtained by contacting the Department of Community Development Services, 33325 8th Avenue South, PO Box 9718, Federal Way, WA 98063-9718,253-835-2607. LIST OF TECHNICAL REpORTS The following specialized studies and plans were prepared and submitted by the applicant: · Environmental Checklist, submitted by Schweikl & Associates, July 11,2007, with revisions submitted June 30, 2008 · Subsurface Exploration and Geotechnical Engineering Report, prepared by Jason Engineering & Consulting Business, Inc., June 20,2007 · Technical Information Report, Preliminary Drainage Review for Steel Lake Crest, prepared by Schweikl & Associates, July 2007 and revised May, 2008 · Environmental Noise Review, prepared by SSA Acoustics, LLP, June 1,2007 · Concurrency Analysis, City of Federal Way, October 23,2007 ATTACHMENTS · July 11,2007, Environmental Checklist, prepared by applicant; revised and additional information submitted May 30, 2008 GENERAL PROJECT INFORMATION Name: Steel Lake Crest Preliminary Plat . Applicants: Steel Lake Plat Group, LLC: Allan W oida, Mike & Cindy Trinidad, and Verlirt & Linda Elder Location: 30642 28th Avenue South, Federal Way, W A - NE ~ Sec. 9, TIIN, R4E, W.M. EXHIBIT PAGE .\ 75 & OF~ Site Size: 294,910 square feet (6.77 acres) Zoning: RS 7.2 - 1 unit/7,200 square feet FWCP Designation: High Density, Single Family Residential SUMMARY OF PROPOSED ACTION AND BACKGROUND Applicants submitted a preliminary plat application to develop 28 single-family residential lots on four existing lots totaling 6.77 acres. The applicants will be required to construct an 18, 449 stormwater detention pond in the northeast comer of the plat; a 329 square foot landscaping tract along Military Road South; a 3,364 square foot and an 868 square foot landscaping buffer along the front of 28th A venue South; and a 3,661 square foot pedestrian pathway to connect to Military Road South. The applicants propose significant grading on site, thus removing a majority of the vegetation, excluding many significant trees. STAFF EVALUATION OF ENVIRONMENTAL CHECKLIST Following are staff responses to the elements ofthe environmental checklist (attached) indicating whether or not City staff concurs with the applicant's response to the checklist item, or staff clarification or amendment of the response. A. BACKGROUND 1-3. Concur with the checklist. 4. First checklist completed July 11,2007, but revised May 30,2008, after reviewed by the Public Works and Planning staff. 5-9. Concur with the checklist. 10. Applicant's agent responded that additional government approvals were: final plat approval; right-of-way permit for road improvements; a WSDOT Discharge Permit; a NPDES permit from the Deparbnent of Ecology; and building permits for individual residential structures. The agent did not include a potential right-of-way permit from WSDOT for location of the pond and pedestrian pathway; a Forest Practice Permit from the Deparbnent of Natural Resources; and a demolition permit to remove the existing structures. B. ENVIRONMENTAL ELEMENTS 1. Earth a. Concur with the checklist. b. Originally stated slopes were 9%, but after review of topographic information, it was determined that there were some areas where slopes were around 50%, although the applicant stated this was the result of previous on-site grading. c-d. Concur with the checklist. e. The applicant proposes to do a mass grading of the site to even out slopes and fill from previous development on the site. The Federal Way City Code (FWCC) states that grading should be kept to a minimum to allow for the placement of the infrastructure such as roads Steel Lake Crest Preliminary Plat Final Staff Evaluation for Environmental Checklist 76 File #07~103898..oo-sE I Doc. 10 46823 EX~:d1 S t:..... ~? Pag~ ililil~Ji'J~ PAGE~OF~ and utility lines. Also, FWCC 20.1 79(c) states that, "lots created on slopes of 15% or greater shall minimize grading and shall not result in extensive use of retaining walls. Slopes are to be measured in their natural state." The applicant's agent states that in order to construct the infrastructure and pond, the site needs to be severely graded to allow this to happen. However, the.applicant has not addressed the fact that there are slopes of 15% and greater on some areas of the property and the proposal includes significant grading in these areas. These issues will be addressed by city code. Finally, test pit exploration identified a source of fill on proposed Lots 4 and 5 was buried debris such as scrap wood, used tires, and other fill materials. The extent and full content of the buried debris is not known at this time. The applicant's agent said excavation of all buried materials will take place prior to . the grading project taking place. r d ~ f-g. Concur with the checklist . /PA pI-1 p ~'W, . h. Do not concur with the checklist. The erosion control plan needs to be,e,esigned and submitted for review and approval as part of preliminary plat approval. The final plan needs to be submitted, reviewed, approved, and installed during the engineering review and BEFORE final plat approval. 2. Air a-b. Concur with the checklist. c. Concur with the checklist. The comment says watering will be utilized. However, since this project is proposing to do mass grading and is located between a residential neighborhood and the 1-5 corridor, a watering truck should be kept on site during the entire grading process to assure that particulate matter does not affect visibility on the highway or adversely impact ambient air quality in the neighborhood. 3. Water a 1. Concur with checklist with the addition that project lies within 200 feet of Steel Lake, a shoreline of significance. Because the applicant is required to construct frontage improvements within theright-of-way, a small portion of the project will take place within 200 feet of the shoreline. Because the area of the improvements was not considered consequential, the applicant was granted a shoreline exemption for the required road improvements. a.2-6 Concur with the checklist. . b.l. Concur with the checklist. b.2. The existing three homes have on-site septic systems. At time of demolition and before any mass clearing and grading can take place on these parcels, the septic systems must be decommissioned by a licensed practitioner and removed in accordance with King County Health Department guidelines. c-d. Concur with the checklist. 4. Plants a-d. Concur with the checklist. 5. Animals a. Do not concur with the checklist. The applicant listed no known birds or animals on or near the site. However, the proposal lies within 200 feet of Steel Lake, a shoreline of significance, which is stocked with trout and/or game fish every year by the Department of Fish and Wildlife. In addition, water fowl are on or within Steel Lake Park that are mostly resident species. Steel Lake Crest Preliminary Plat Final Staff Evaluation for Environmental Checklist File #07-103898-00-8E I Doc ID 46823 Page 3 77 '. ~ ,.. .. - .... :. .' L..J1i~~- :~t~~. J ~ _____ PAGE--3-0F~ b-c. Concur with the checklist. d. The pedestrian pathway and landscaped areas may not attract birds or wildlife because of the species being planted. They were not required to provide habitat areas for wildlife. 6. Energy and Natural Resources a-c. Concur with the checklist. 7. Environmental Health a Do not concur with the checklist. Preliminary exploration has identified there is construction debris located in the north end of the properties. The full extent of the debris area or contents is not known at this time. The area must be excavated and debris taken off site before any significant grading or clearing taking place on the property. Ifhazardous materials are discovered in the burial site, then the debris must be properly disposed of in accordance with King County Solid Waste Department and possibly Washington State Department of Ecology guidelines. b. Do no concur with the checklist. The noise study identified two choices for the applicant: build a large berm or retaining structure; or require that the houses be constructed of soundproofing materials. The applicant has not specified which will be constructed. 8. Land and Shoreline Use a-c. Concur with the checklist. d. Three houses, one shed, a barn, a swimming pool~ and three septic tanks will all be demolished and removed from the site. e-f. The zoning of this property is RS-7.2, and the comprehensive plan designation is High Density, Single Family Residential. g-1. Concur with the checklist. 9. Housing a-c. Concur with the checklist. 10. Aesthetics a-c. The height limit in this zone is 30 feet. If on a slope, the height is measured as an average of the uphill grade to the proposed basement grade, and the average cannot exceed 30 feet. The applicant will be designing a number of homes with daylight basements on areas with slopes. The height of each structure will be addressed during building permit review. 11. Light and Glare a-c. Concur with the checklist. d. With the removal of a significant number of trees on the properties, any buffering from the glare of lights from the 1-5 corridor will be significantly reduced. There will be eight of 52 existing trees retained o~ the seven lots bordering the 1-5 corridor. 12. Recreation a-c. Concur with the checklist. 13. Historic and Cultural Preservation a-b. Concur with the checklist. c. If any cultural items are uncovered during excavation, clearing, and grading, the local tribes should be notified, in addition to the Washington State Historical & Archeological Society. Steel Lake Crest Preliminary Plat Final Staff Evaluation for Environmental Checklist 78 File #07-I03898-OO-SE I Doc ID 46823 Page 4 EXHIBJT~ PAGE~OF ~ 14. Transportation a-g. Concur with the checklist . 15. Public Services a-b. Construction of25 additional houses in a residential neighborhood will add impacts to public services for fIre, police, and utility use. Such construction will also generate new students in the school system, additional use of parks, and increased traffic and use of streets. The applicant will be required to address school impacts and pay fees as requested by the school district at final plat stage. The use of parks and open space were reviewed at preliminary stage and will be assessed as part of the building pennit process and any open space requirements will be paid before final plat approval. Traffic impacts and street improvements have been addressed during the preliminary review and improvements will be required to be put in place during engineering review of the plat 16. Utilities a-b. Concur with the checklist CONCLUSION The lead agency for this proposal has detennined that the proposal for a residential subdivision project does not have probable signifIcant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.21C.032(2Xc). This decision was made after review ofa completed environmental checklist and other infonnation on fIle with the lead agency. The infonnation is available to the public upon request The City reserves the right to review any future revisions or alterations to the site or the proposal in order to detennine the environmental significance or nonsignifIcance of the project at that point in time. Prepared By: Date: Senior Planner Joanne Long-Woods, AICP October 2, 2008 Steel Lake Crest Preliminary Plat Final Staff Evaluation for Environmental Checklist 79 File #07-103898-00-SE I Doc ID 46823 Page 5 EXHIBIT ~ PAGE S OF~ RESUBMITTED ...-...~... _ MAY 3 0 2008. DUARTMENTOFCOMMUNlTYD...WPMENTS..VICES .. ~ CITY OF FEDERAL WAY 33325 8th Avenue South CITY OF <~l"~~c,~",.",,,4 BUILDING OM UBM! Federal Way W/~8~~;-~~:: ~edera I '.A 'ay 253-835-2607; Fax 253-835-2609 rl v Vj www.citvoffederalway.com ENVIRONMENTAL CHECKLIST PURPOSE OF CHECKLIST The State Environmental Policy Act (SEP A), Revised Code of Washington (RCW) Chapter 43.21 C, requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An environmental impact statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide infonnation to help you and the agency identifY impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be done) and to help the agency decide whether an EIS is required. INSTRUCTIONS FOR ApPLICANTS This environmental checklist asks you to describe some basic infonnation about our proposal. Governmental agencies use this checklist to detennine whether the environmental impacts of your proposal are significant, requiring preparation of an EIS. Answer the questions briefly, with the most precise infonnation known, or give the best description you can. You must answer each question accurately and carefully, to the best of your knowledge. In most cases, you should be able to answer the questions from your own observations or project plans without the need to hire experts. If you do not know the answer, or if a question does not apply to your proposal, write "do not know" or "does not apply." Complete answers to questions now may avoid unnecessary delays later. Some questions ask about governmental regulations, such as zoning, shoreline, and landmark designations. Answer these questions if you can. If you have problems, the governmental agencies can assist you. The checklist q"C'stions apply to all parts of your proposal, even if you plan to do them over a period of time or on different parcels of land. Attach any additional infonnation that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to detennining if there may be significant adverse impact. USE OF CHECKLIST FOR NON-PROJECT PROPOSALS Complete this checklist for non-project proposals, even though questions may be answered "does not apply." In addition, complete the Supplemental Sheet for Non-Project Actions. For non-project'actions, the references in the checklist to the words "project," "applicant," and "property or site" should be read as "proposal," "proposer," and "affected geographic area," respectively. EXHIBIT ~ PAGE~OF .J, 7, Bulletin #050 - December 22, 2005 Page I of 17 80 k:\Handouts\Environmental Checklist A. BACKGROUND I. Narne of proposed project, if applicable: Steel Lake Crest 2. Name of applicant: Steel Lake Plat Group: Allan Woida, Mike & Gloria Trinidad and Verlin & Linda Elder 3. Address and phone number of applicant and contact person: Ms. Linda Elder 30642 28th Avenue South Fede~1 Way, Washington 98003 PH: (253) 946-3154 4. Date checklist prepared: 07/11/07 - ~IL~ ~/8Dlb3 5. Agency requesting checklist: City of Federal Way 6. Proposed timing or schedule (including phasing, if applicable): The project will be constructed in one phase and is scheduled to commence in Summer 2008 and be completed by Fall 2009. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. There are no plans for future additions or expansions at this time. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. SSA Acoustics will be preparing a site aC!Lustical analys~ Jason Engineering and Consulting Business, Inc. will be conducting a Qeotechnical D~pO" for the site and The Roper Company will conduct a siS[nificant tree inventory and landscape plan. In a letter dated May 10,2007, the City of Federal Way granted an exemption request from the project requiring them to obtain a Shoreline Substantial Development Permit. 9. Do you know whether applications are pending for governmental approvals of other proposalsdirectly affecting the property covered by your proposal? If yes, explain. .'~ Nonea... pendiBg at this time. EXHI~T, -A PAGE--,----OF 10. List any government approvals or permits that will be needed for your proposal, if known. Bulletin #050 - December 22, 2005 Page 2 of 17 81 k:\Handouts\Environmental Checklist The project will require a final plat approval, a right-of-way permit for the road improvements, a WSDOT Discharge Permit, a Dept. of Ecology NPDES permit and individual building permits for the residential structures. ~t f7.0-ch 'uPVwW.{. -r 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. The proposed project site consists of four parcels (parcel Numbers 0921049182, 0921049183, 0921049096 & 0921049161) which are located on the east side of the 306th block of 28th Avenue South. The project site covers the area between 28th Avenue South and the 1-5 right- . iJ of-way. The p~~to divide the four parcels,whicb comprise apProximatel~ 292,892 . rWM square feet or ~ prior to dedications, into fi8 residential lots and fIVe tra~ The ()J ifI';J-' existing three residences, including all accompanying structures, will be removed and new ~q I . 1, wood framed bomes will be built on each proposed lot. The tracts will contain a stormwater lttJV/L detention facility, a pedestrian pathway and three separate landscape buffers. U 12. Location of the proposal. Give sufficient infonnation for a person to understand the precise location of your proposed project, including a street address, if any, and section, to~nship, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any pennit ap.plications related to this checklist. The project is located in a portion of the NE ~ of Section 9, Township 21 North, Range 4 East, WM. The addresses of the three existing on-site residences are 30614, 30642 & 30646 28th Avenue South. The parcels legal descriptions are as follows: PARCEL 0921049182 THE SOUTH HALF OF THE NORTH HALF OF THE SOUTHWEST QUARTER OF THE NORTHEAST QUARTER OF THE NORTHEAST QUARTER OF. SECTION 9, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON; EXCEPT THE WEST 30 FEET THEREOF FOR COUNTY ROAD; AND EXCEPTTHA T PORTrON THEREOF FOR STATE HIGHWAY AS CONVEYED IN DEED RECORDED UNDER RECORDl1':\ICi NI IMBER 4986687. PARCEL 0921049183 THE NORTH HALF OF THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE NORTHEAST QUARTER OF THE NORTHEAST QUARTER OF SECTION 9, TOWNSfllP 21 NORTH, RANGE 4. EAST. W.M., IN KING COUNTY, WASHINGTON; EXCEPT THE EAST 100 FEET THEREOF ^t:!P ALSO EXCEPT THE SOUTH 85 FEET OF THE WEST 150 FEET THEREOF AND ALSO EXCEPT THE WEST 30 FEET FOR COUNTY ROAD.. (ALSO KNOWN AS TRACT 33 EXCEPT THE EAST 100 FEET THEREOF AND EXCEPT TIlE SOUTH 85 FEET OF THE WEST 150 FEET THEREOF, OF STEEL LAKE NORTH SHORE TRACTS, AN UNRECORDED PLAT.) TOGETHER WITH EAST 100 FEET OF THE NORTH HALF OF THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE NORTHEAST QUARTER OF THE NORTHEAST QUARTER ~ \ v' onmental Checklist Bulletin #050 - December 22, 2005 OF SECTION 9, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON; LESS STATE HIGHWAY. PARCEL 0921049096 THA T PORTION OF THE NORTH HALF OF THE NORTH HALF OF THE SOUTHWEST QUARTER OF THE NORTHEAST QUARTER OF THE NORTHEAST QUARTER OF SECTION 9, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, W ASHINGTON, LYING WESTERLY OF OLD MILlT ARY ROAD (REVISED); EXC~PT THE WEST 30 FEET THEREOF ACQUIRED BY KING COUNTY FOR 28TH A VENUE SOUTH; AND EXCEPT THAT PORTION DEEDED TO STATE OF WASHINGTON FOR STATE HIGHWAY NO. I, RECORDED UNDER RECORDING NUMBER 4986698. .- PARCEL 0921049161 THE SOUTH 85 FEET OF THE WEST 150 FEET OF THE FOLLOWING: THE NORTH HALF OF THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE NORTHEAST QUARTER OF THE NORTHEAST QUARTER OF SECTION 9, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON; EXCEPT THE WEST 30 FEET FOR ROA Q, - B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one): flat, rolling, hilly, steep slopes, mountainous, other. The best general description of the site would be continuous sloping, with an average slope of 9.5% from the southwest corner to the northeast corner. rV\. b. What is the steepest slope on the site (approximate percent slope)? There are a couple of small areas where the ~Io~ exceed 50%. on thp. ~i(~ These areas are not naturally occurring, but are a manmade result of filling from the corresponding on-site residences. The grading plan for the proposed project will eliminate all of these areas. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, mulch)? If you know the classification of agriCultural soils, specify them and note any prime farmland. 1\'0 Per the 2005 City of Federal Way Regional Soils Map, which is based on information . 1i)..,.I.\: frA presented in the 1973 Soil Conservation Service Survey of King County, Alderwood gravelly il\v JiJ"" sandy loam type soils are mapped for the project site. The western one-half of the project is (oyJl' comprised of Alderwood (AgD) soils and the eastern half of the project has Alderwood (AgC) solis. Both soU types are Hydrologic Soils Group (HSG) C. Field mvestigatioa hag..'~ uncovered an area of discarded old tires and wood debris along the north plat boundary by The geotechnical engineer will require that the tires and debris be removed. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. There were no areas of observed unstable Jails observed on or adlent to the site during eXHIB!T Bulletin #050 - December 22, 2005 Page 4 of Pita E 0 F~nVironmental Checklist any of the project site visits and there is no history of any that have been discovered. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source offill. The project obtained the services of Earthwork Services, Inc. to calculate preliminary earthwork quantities. Their report dated May 2,2007, is based 'on a preliminary grading plan completed by Schweikl & Associates, and concludes that the project will be a cut site. Calculated values are tz,821 ('..hie yftMli: of cut. 1 '1,4-04 cubic yards of fill and 5,152 cubic yards of strip pines. Further refinement of the grading plan is possible in attempting to create a balanced site. The contractor should also attempt to ~~ strif!Phlgs on-site.. where ever possible. If off-' tructural fill material becomes necessary, the material would be taken from th closet vaiIable source at the time of project construction. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. As with any glacial till soil there is the possibility of erosion when disturbed by construction activities, especially with the use of heavy construction equipment on uncompacted material. The site is required to prepare and ~1I an erosion contro~ that will be reviewed and approved by the City of Federal Way to address the possibility of erosion. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The project is proposing a maximum impervious coverage of 53.6% using the modeling - criteria from the King County Storm Water Design Manual. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any. As part of the .!!nal d~ the project is required to prepare and install an Erosion/ Sedimentation CiiiitrOI Plan. . The plan, which is review~and approved by the City of Federal Way, will address the issue of erosioQ and provide m~"J"4lQ to reduce Qnd/or minimize its effects. Among the proposed measures included in the Erosion/Sedimentation Control Plan will be a temporary rock construction entrance, siltation fencing, catch bJl!!!t sediment protection, interceptor swales, sediment traps, straw bales, mulching and hydroseeding. Also included with the plan is a recommended construction sequence and a copy of the City of Federal Way's standard erosion/sedimentation control notes. It is the responsibility of the contractor to adhere to the plan and maintain in a functional manner all erosion control facilities. 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities ifknown. The grading activities proposed at the site will cause dust particulate to be emitted to the air. Vehicles and equipment used during all phases of construction can be a potential source of emissions. When the project is completed, the site will generate emissions that are typical of any other modern residential neighborhood. Vehicle emissions from the residents automobiles, emissions from lawn and landscaping maintenance equipment, certified wood stoves and/or fire places, furnaces, barbeques, etc, are all pot~ntial sources of air emissions. Bulletin #050 - December 22, 2005 Page 5 0 :I ,\Environmental Checklist PAGE-ULOF .zI!. However, the quantities are unknown. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. Vehicles using 28th Avenue South and Interstate 5, adjacent to the sites west and east boundaries respectively, can be a source of emissions or odor. However, it is not anticipated that these off-site vehicle sources of emissions will impact this proposal. There are no other known sources of odor or emissions in the vicinity. c. Proposed measures to reduce or control emissions or other impacts to air, if any. " . Unwanted dust particulate can be controlled to a ~ertain extent by the application ofwater~>~\ before and during grading activities. Also, by keeping the temporary construction entrances '0 c j ,,)Ir \ clean and functioning properly, along with regular street sweeping of 28th Avenue South, !\,Y dust generated from displaced material on roadways can be kept to a minimum. It is. ' assum~ the construction vehicles used will be equipped with factory-installed mu.~ and spark arresters that would control excessive emissions. 3. WATER a. Surface. 1) Is there any surface water body on or in the immediate vicinity of the site (including year- round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. There are no surface water bodies or wetlands located on the site. There are however, two lakes in the vicinity of the project. To the west, across the 28th Avenue South right-of-way is Steel Lake. At its closest point, the lake is approximately 200 feet from the extreme northwest corner of the proposed site. East of the site, across the 1-5 right-of-way lies Dolloff Lake. From the northeast corner of the site it is approximately 1,000 feet to the northwest portion of the lake. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described ~ waters? If yes, please describe and attach available plans. t ,. _ '.>>I ~~N- . Yes. The project is required by the City of Federal Way to do half street frontage (}f'.! tVv~ improvements on 28th Avenue South, and a portion of these imp.rovements will fall (Jy.;" ',J-1\ within 200 feet of Steel ~ake. Approximately 40 linear feet of vertic~l curb, 200. Jy~;./"-, square feet of concrete Sidewalk and 40 square yards of asphalt paVIng, along With .\1; v - \. extending an existing storm drainage pipe 10 feet will occur within the 200 foot : f,l.f;' \ rJ/Y boundary of the lake. This work is all off-site of the proposed project, only a small ~~ ~ }l amount of landscaping (10 square yards) and some minor grading (less than 10 cubic yards of on-site movement) actually occur on-site and within 200 feet of the lake. 3) Estimate the amount offill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. No fill or dredge material will be placed or removed from either of the lakes. Bulletin #050 - December 22, 2005 EXHIBIT" Page 6 of IPAGE4-0f:~nVironmental Checklist 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. None anticipated. Both lakes receive storm water runoff from the site as part of the existing drainage system. The proposed project will continue its natural discharge to these water bodies per the City of Federal Way's Storm Water Drainage Manual. 5) Does the proposal lie within a IOO-year floodplain? If so, note location on the site plan. No, the project does not lie within a 100 year floodplain. 6) Does the proposal involve any discharges of waste materials to surface waters? Ifso, describe the type of waste and anticipated volume of discharge.. No b. Ground. I ) Will ground water be withdrawn, or will water be discharged to groundwater? Give general description. purpose, and approximate quantities if known. No 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: domestic sewage; industrial, containing the following chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. There are no proposed discharges of waste material to the ground from any source. The site proposes a low pressure forced main sanitary sewer collection system for all lots and conveyance to the existing Lakehaven Utility District gravity sanitary sewer line at South 309tb Street. From there the emuent is conveyed to an off site treatment facility. Currently the existing I"!.shlPnces have prMat~.on-site septic systems. The project proposes to have these residences.removed, at that time the ~teps will be taken to abandon their septic systems. ~' ? c. Water Runoff(including stormwater) I) Describe the source of runoff (including stonnwater) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. This project has the somewhat uncommon situation where it actually falls within two separate drainage basins. Essentially the off-site portion of the project (the 28th Avenue S~uth right-of-way) is part ofthe Lower Puget Sound drainage basin, and the on-site portion is part of the Mill Creek drainage basin. Therefore runoff from the project site is divided two ways. Stormwater runoff from the 28th Avenue South half street frontage improvements will be collected, treated via a catch basin filtersystem, and released to the existing conveyance system that discharges west into Steel Lake. Runoff from the remainder of the site will be collected by means of a tightline conveyance system to a proposed onsite stormwater detentionlwater quality wetpond located in a separate tract at the northeast corner of the project site. EXHIB!l_-"- Bulletin #050 - December 22,2005 Page 7 otpAGE~OF ~vironmental Checklist Discharge from the wetpond is daylighted to the Military Road South right-of-way, the project on-sites natural discharge location, where it flows east, enters an existing storm drainage conveyance system that passes under the 1-5 right-of-way and daylights before eventually entering Dolloff Lake. 2) Could waste materials enter ground or surface waters? If so, generally describe. Naturally with a project of this type and size the possibility exists of accidental contamination. Spills and carelessness during construction could occur. ~~fnew residential homes will be built and the new residents all could potentially be sources for waste entering ground or surface water. Everything from poor handling of landscaping products (chemicals and fertilizers) to painting practices to leaky automobiles and their care. To our knowledge, of the things that are under the projects control, there are no other known sources of contaminants associated with this proposal. The project will also be required to prepare plans for, obtain approval of, and install a water quality facility operating in conjunction with a detention system. The parameters of which are governed by the current surface water design . manual adopted by the City of Federal Way. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any. The project proposes tOimPlem. ent techniques consistent w~e City of Federal Way's Storm Water Design Manual to minimize all impac~ stormwater runoff. All on-site stormwater runoff generated from this project wUl be collected, detained, and treated in a combined detention/water quality wetpond facility prior to discharge. The wetpond discharge wUl be controlled per the design manual, to discharge at a rate no greater than the predeveloped sit<<@rate of discharge. The wetponds outlet 10CatiOn~east into the Military Road South right-of-way, closely approximates the on-sit. atural discharge location. The designed overflow route also follows this same pa . All of the projects' off-site generated stormwater runoff will also be collected and treated. Treatment will be provided by settling in the water quality storage in the detention facility. Runoff will then be released into the existing stormwater conveyance system, where it flows west and discharges to Steel Lake. 4. PLANTS a. Check or circle types of vegetation found on the site. -X.. deciduous tree: alder, maple, aspen, other (birch, madrona) -X..evergreen tree: fir, cedar, pine, other .Ji...shrubs ..JLgrass _pasture _ crop or grain _ wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other _ water plant: water lily, eelgrass, milfoil, other _ other types of vegetation EXHIBIT G PAGE-aOF ~-z... b. What kind and amount of vegetation will be removed or idtered? Most trees and vegetation located on the project will be removed to allow for the construction of the proposed internal road, the 28th Avenue South frontage improvements, Bulletin #050 - December 22. 2005 Page 8 of 17 8 7 k:\HandQuts\Environmental Checklist new utility services and the proposed new homes. The project does propose retaining significant trees located near the perimeter of the site, primarily along the eastern boundary line. Others will be retained adjacent to the northern and southern boundary lines. The project has obtained the services of The Roper Company, registered landscape architects, to conduct a significant tree inventory and create a landscape plan which will best utilize the existing native plant life. C. List threatened or endangered species known to be on or near the site. To our knowledge, there are no threatened or endangered plant species on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, ifany. upo. n completion of cons truction of the Single-familY. resid ential homes the disturbed areas ~;I~.' ~ within the lots will be landscaped with lawn and/or mulched garden planting beds. Durin2- I ~onstruction siltation fencing, tree retention fencin! and limits of construction fencin .;- aU be utilized to identi rotect and revent in . . are v etation are to be t preserved. ..--= The project has obtained the services of The Roper Company (registered landscape architects) to provide a landscape plan for Steel Lake Crest. Included in this plan will be a significant tree inventory, tree pIantings along the plat street right-or-ways, and screening landscaping for the detention wetpond tract and the required 10 foot landscape buffers. Landscaping in the buffers will be to the City of Federal Way's Type III landscaping criteria. . 5. ANIMALS a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site. birds: hawk, heron, eagle, son2birds, other (chickadee. robin. wren) mammals: deer, bear, elk, beaver, other (squirrel. raccoons. mice) fish: bass, salmon, trout, herring, shellfish, other (none) c~{;~ J~ b. List any threatened or endangered species known to be on or near the site. To our knowledge, the.re are no threatened or endangered animal species on or near the site. c. .ls the site part of a migration route? If so, explain. The site is located within the boundaries ofthe western flyway. However, migrating bird populations have not been known to visit the site d. Proposed measures to preserve or enhance wildlife, if any. No specific wildlife preservation measures are proposed by the project, however the three ~ \(Y~ ~ 1\(1).-6 proposed landscape tracts, along with portions of the proposed Pedestrian Pathway tract IV ~ IJ.I will provide some ~reas of landscaped open lIpace within (hi> dpvWtpment where birds and. "~ o~er small wil~life species may fora2e or 1J1Ie all hahitat Also, while most of the native ~\~ vegetation will be removed during the installation of infrastructure and the construction of homes, once finished the resident's YEXHI sii-some l!;efits to certain wildlife species. Bulletin #050 - December 22. 2005 pa'AG!8 andouts\Environmental Checklist 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, martufacturing, etc. The primary energy sources requi~d to meet the energy needs of the proposed plat is electricity and natural gas. Sufficient amounts of which would be needed to maintain a comfortable lifestyle and environment within the bounds of single family residential dwellings, b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No, it is not anticipated that this project will affect the potential for adjacent properties to use solar energy. The building heights will not exceed the maximum which is allowed in the RS 7.2 zone. The proposed structures will not be located in such a way that they will affect the exposure of any adjacent existing structure, especially those adjacent structures seeking the maximum benefits afforded to solar users obtained from the preferred southern exposure c. What kinds of energy conservation features are included in the plans of this proposal? List other , proposed measures to reduce or control energy impacts, if any. /\^ ~ ~. V \Jl k~ The homes will be built to meet or exceed current building and energy codes. ; \}P 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste that coold occur as a result of this proposal? If so, descri2 ~' Typically, a residential development is not a source of environmental health hazards. "'jJt/ However, the risk of fire is always present within a residential development I) Describe special emergency services that might be required. While not anticipated to occur, the services of local emergency service providers may be required at some time. There are no "special needs" emergency service requirements associated with this project outside of the normal level of service provided to the surrounding similar residential neighborhoods ,- r::: JY~ \ 2) Proposed measures to reduce or control environmental health hazards, if any. Outside of the installation of a fire hydrant within the development, there are no additional measures provided. b. Noise. I) What types of noise exist in the area which may affect your project (for example: traffic, equipment operation, other)? Vehicular traffic noise is generated on 28th Avenue South along the west project boundary and from Interstate 5 in the east. The City of Federal Way is requiring a EXHIBIT" Bulletin #050 - December 22, 2005 Page l~l~ J S OF ~uts\EnVironmental Checklist noise study be completed that documents freeway noise levels and identifies appropriate measures to mitigate the impacts on the development. The project has obtained the services of SSA Acoustics to prepare a site acoustical analysis. 2) What types and levels of noise would be created by or associated with the project on a short-term or long-term basis (for example: traffic, construction operation, other)? Indicate what hours noise would come from the site. During the short-term, construction activity at the project site can and will vary considerably. In addition. because the noise produced on the site depends on the equipment being used, the levels could easily vary from day to day. Maximum construction noise levels can be expected to range from 65 to 89 dBA with an average value of approximately 85 dBA. Minimum noise levels can be expected to have a wider range of 57 to 88 dBA with an average value of 78 dBA (based on a construction activity noise model, described in Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances). Noise associated with construction operations on the site will occur roughly between the hours of 7 :00 a.m. to 6:00 p.m., Monday through Friday and the possibility of some Saturdays. Long-term noise impacts will result from increased vehicular traffic at the site and from the average generated noise levels associated with a typical single-family residential development. 3) Proposed measures to reduce or control noise impacts, if any. Noise impacts associated with the construction phases of the project will be limited in duration. To mitigate general noise impacts during the grading phase, measures such as using and regularly maintaining efficient mumers and quieting devices on all construction equipment and vehicles can be anticipated. No measures to mitigate noise impacts during the building phase are proposed. Construction hours will be limited to the normal workday, 7:00 a.m. to 6:00 p.m. Proposed measures to mitigate noise generated by the nearby freeway should be outlined in the site acoustical analysis being prepared by SSA Acoustics. Common noise preventive building practices such as using s~cial windows, extra insulation, sound deadeninr materials, etc may be used. More passive measures including choosing house plans that hinder the intrusion of noise, and locating th~mes on the lots to best block sound from certain directions could be OptidiS. Also lailcfscaping and fencing techniques are other possibilities. - 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? The current land use for the site is single family residential, however with only three residences on the 6.72 acre site, it does not come close to the density allowed under the citIes zoning classification. The adjacent properties to the north, south and west all have the same zoning and, except for the illC2ally operati~ commercial ~lumbin2 company located o~ east half of the sites north boundary line, all are in single family residential land use. Directly east of the site, the~roperty is state owned right-of-way containing 1-5. b. Has the site been used for agriculture? Ifso, describe. EXHIBIT ~ PAGe-lLoF ~ Bulletin #050 - December 22, 2005 Page II of 17 90 k:\Handouts\Environmental Checklist To our knowledge, the project parcel has never been used for crop production, however, timber harvest may have occurred at some time in the past. c. Describe any structures on the site. There are three existing residences (homes) on the project site. The residence at 30614 28th Ave S. consists of a single house. The residence at 30642 28th Ave S is a house with a built-in back yard pool and a separate outbuilding/shed. The third residence has a house and a larger outbuilding! barn. ~ Oyt f Yes, all existing structures are to be removed. A~ D l Pyt , \f> (O^' \r d. Will any structures be demolished? If so, what? e. What is the current zoning classification of the site? RS 7.2,1 unit per 7,200 square feet f. What is the current comprehensive plan designation of the site? High-Density Single Family Residential. g. If applicable, what is the current shoreline master program designation of the site? For the small area in the northwest comer of the site which falls within 200 feet of Steel Lake, the shoreline designation is urban. h. Has any part of the site been classified as an environmentally critical area? Ifso, specifY. The extreme northwest comer of the site falls within 200 feet of Steel Lake and is therefore part of the City of Federal Way's Shoreline Management Plan. No other mapped Critical Areas exist on the site. There are a few small areas on the site where the slope exceeds 40%. None of these steep slopes are naturally occurring, but are the result of grading or filling associated with the existing residences. I. Approximately how many people would reside or work in the completed project? The proposed plat of281~ts will provide housing for approximately 70-120 individuals J. Approximately how many people would the completed project displace? 7 k. Proposed measures to avoid or reduce displacement impacts, if any. None, the people being displaced from the site are the applicants of this document, and the owners of the project. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. The City of Federal Way has a compreheXHifiiVlan t t covers the site and the Bulletin #050 - December 22,2005 Page 121'XG~40F ~\EnVirOnmental Checklist adjacent parcels. All the surrounding parcels, along with the project site have a land use designation of Single Family Residential. 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low- income housing. 28 new middle to high income single-family residences will be provided by projects end b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. The three existing middle income single family residences would be eliminated. c. Proposed measures to reduce or control housing impacts, if any. The proposed plat will create housing consistent with the principals and mandates of the Growth Management Act (GMA). The GMA strives to increase existing urban densities to allow for the full utilization of existing utilities, services and infrastructure and to increase the functionality of mass transit while protecting the rural environments from urban sprawl. 10. AESTHETICS a What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The tallest structure will be two stories and less than 30 feet in height with a wood and/or vinyl exterior. b. What views in the immediate vicinity would be altered or obstructed? The project should not compromise the views from adjacent properties. The view of the site, of course, will be altered to that of a single-family housing development. The required landscape buffers along 28th Ave S and Military Road S, . c. Proposed measures to reduce or control aesthetic impacts, if any. The proposed plat will include architecturally compatible homes built by a single builder meeting the requirements of the City of Federal Way Building Guidelines. The interior road will be built to the City of Federal Way's public road standards (Section W) and the project proposes the creation of aesthetically pleasing front yard landscaping for the single- family residences. 10 foot landscape buffers will provide screening between the development and those traveling on the arterials adjacent to the project. Also, The Roper Company (registered landscape architects) has been obtained to provide a landscape plan for Steel Lake Crest. Included in this plan is landscaping and tree plantings for along the adjacent street right-of-ways, landscaping of the detention/wetpond tract and screening landscaping for the landscape buffers. 11. LIGHT AND GLARE a. What type of light or glare willthe proposal produce? What time of d.WOUld it mainly occur? EXHIBIT Bulletin #050- December 22, 2005 Page 13 of I~E~o~~nvironmental Checklist Light and glare is the result of reflective surfaces from the glazing and building materials, exterior building lights, and street lights. During evening and night time hours, exterior building lights and street lighting will be designed to minimize the dispersal of light beyond - , v the project. Properly designed and placed lights, specifically chosen to illuminate target "(/" fj.I ..j.{ areas with downward emitting luminaries, can be used to light intended areas without ~y\ ~. (If \ having negative impacts on others. The occurrence of light impacts would be anticipated wr ; from dusk to dawn. Some glare impacts may be-present during the daytime associated \ iV primarily with nonnalresidential window glazing. The impacts from glare may also occur \~ seasonally. b. Could light or glare from the finished project be a safety hazard or interfere with views? It is highly unlikely that glare or light from the project site will interfere with views, affect wildlife, create safety problems, or have any other adverse impacts. The proposed project will have the same accompanying light and glare impacts that are consistent with the other adjacent residential developments. Streetlights and other outdoor lighting are intended to promote safety rather than create a safety hazard. c. '} What existing off-site sources of light or glare may affect your proposal? ,llIpJ . II ! There are no known off-site sources of light or glare that are anticipated to affect this proposaL I\~ / Streetlights along 28th Avenue South and vehicular lights from cars on 1-5 and 28th Avenue are y' . "\, present, but not unusual in any way or inconsistent with what exists in neighboring \y . , developments. \~ d. Proposed measures to reduce or control light and glare impacts, if any. I V5 i ~fr (; , Using exterior building lights of low intensity and directing street lights to point downward are typical ways to control light and reduce glare. are used for safety and security purposes. Landscaping techniques can also be used to provide screening of light between homes, other adjacent developments and vehicles as well. The positive affects of light however, mainly safety and security (especially at night), must be weighed when proposing measures to control it. 12. RECREA nON a. What designated and informal recreational opnortunities are in the immediate vicinity? Steel Lake Park, The Commons at Federal Way b. Would the proposed displace any existing recreational uses? [fso, describe. No, the project will not displace any recreational opportunities c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any. No measures are proposed, however the applicants will be paying a fee-in-Iieu-of providing on-site open space which benefits the City of Federal Way Parks, Recreation and Cultural Services (P ARCS) department. EXHIBIT -A- PAGE~OF :z..,-z...- 13. HISTORIC AND CULTURAL PRESERV AnON Bulletin #050 - December 22, 2005 Page 140fl7 93 k:\Handouts\Environmental Checklist a. Are there any places or objects listed on, or proposed for, nation, state, or local preservation registers known to be on or next to the site? If so, generally describe. None known to exist. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None known to exist. c. Proposed measures to reduce or contr~1 impacts, if any. There are no measures proposed to reduce or control impacts. However, if objects are unearthed during site work that may be culturally significant, the Washington State Office of Archaeology and Historic Preservation will be notified I 1(:. ..Ldm lu.~ 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. The only street which will service the site is 28th Avenue South, and the project is proposing a single entrance/access onto it. Besides Interstate 5 to the east, which restricts direct access, Military Road South is the only other street adjacent to the site. The City of Federal Way and the project owners have agreed not to provide vehicular access to it. A proposed footpath will allow pedestrian access between Military Road and the projects proposed internal loop road. Military Road is easily accessible from the site by traveling north two blocks on 28th Ave S, turning east onto South 304th Street and proceeding one block. Traveling west on S 304th St from 28th Ave S for just over a half mile will bring you to Pacific Highway South. Less than a mile to the south of the site via 28th Ave S is South 320th Street, the main east-west arterial in the city, and access to Interstate 5. b: Is the site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? Yes, Metro Transit Route 183 (south to Federal Way Transit Center, north to Kent Station) has stops along 28th Ave S within a quarter mile of the site. c. How many parking spaces would the completed project have? How many would the project eliminate? The completed project will provide at least two exterior driveway parking spaces and two interior garage parking spaces per new residential lot proposed. For a minimum total of S6 exterior spaces added and S6 interior spaces added. The possibility exists that the homes chosen to be built will have three car garages thereby increasing the number of parking spaces accordingly_ The existing residences are to be removed from the site, so the project would eliminate the approximately 18 parking spaces associated with them. Also, it should be noted that the' proposed internal road will be built to the cities Section W standard, which is designed to accommodate parking on both sides. d. Will the proposal require any new roads or streets, or improveplents to existing roads or streets, Bulletin #050 - December 22, 200$ P~eI50fE:~tilE!1 P4~i= 2D OS: 7..Z..-o not including driveways? Ifso, generally describe (indicate whether public or private). Yes, an internal loop road will be constructed per tbe .City of Federal Way's Public Works Development Standards witb a Type W cross section. Tbe internal road wiD be public witb tbe 52 foot right-of-way dedicated to the city. Half street frontage improvements are also required to 2811I Avenue South. The project will dedicate an additional 9 feet to the 2811I Ave S right-of-way, so that the street can be improved to a Type K section. e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. It is aot aatidpated tbat water or rail transportatioa will be utilized by tbe project. ~~~ " Residents of the development most likely will use air transportation at some time. Seatac l,(Yv International Airport is located approximately 10 miles to the north, and Auburn Municipal Airport is located approximately 5 miles to the east. f. How many vehicular trips per day would be generated by the completed project? Ifknown, indicate when peak. volumes would occur. According to the ITE Trip Generation Manual, Seventh Edition, page 269, Land Use Code 210, Single-Family Detached Housing, the average number of trips generated per dwelling unit is 9.57. Multiplying 9.57 by the total number of lots, 28, yields a result of approximately 268 total vehicle trips per day for the completed project. Because the project is removing three existing residences (dwelling units), the net or new vehicular trips generated by the completed project is 239 (9.57 multiplied by 25). Although the exact time of peak flow is unknown, they generally occur on weekdays, between the bours of 7 & 9 AM and 4 & 6 PM. g. Proposed measures to reduce or control transportation impacts, if any. Besides the required half street frontage improvements to 2811I Avenue South, a site distance analvsis determined that the proiect install a two way left turn lane in 28th Ave S to Drovide ~fe acces~ to and from the site. The project will also pay a traffic mitigation fee based on a concurrency analysis which the project wiD pay the City of Federal Way to perform. The traffic mitigation fee will go towards funding transportation projects deemed necessary to raise the level of service in areas impacted by this project. 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. Yes. Whenever a residential development is constructed, the need for public services, such as police and fire protection, increases. Federal Way School District No. 210, City of Federal Way Police Department, and South KingFire and Rescue serve the site. b. Proposed measures to reduce or control direct impacts on public services, if any. At the time of final plat mitigation fees are paid to the city, manfitowards funding public services. Public Services also benefit from tbe increased co ution to tbe property tax base. J\,~ '-4"<< IJ-^ \ EXHIBIT-A- 16. UTILITIES PAGE~OF -.n... Bulletin #050 - December 22, 2005 Page 16 of 17 95 k:\Handouts\Environmental Checklist a Circle utilities currently available at the site: electricity. natural !las, ~, refuse service, telephone, sanitary sewer, septic svs"tem. other cable(please list) b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. Electric: Water: Telephone: Cable: Gas: Sanitary Sewer: Reuse Service: Puget Sound Energy Lakehaven Utility District QWest Communications Comcast Puget.Sound Energy Lakehaven Utility District Waste Management C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. SIGNATURE: DATE SUBMITTED: EXHIBIT ~ PAGE->>-OF 1.'z, Bulletin #050 - December 22, 2005 . Page 17 of 17 96 k:\Handouts\Environmental Check1 ist Joanne Long-Woods From: Sent: To: Cc: Subject: h_david kaplan [hdk1934@hotmaiLcom) Monday, October 20, 20083:19 PM Joanne Long-Woods; Greg Fewins; Cary Roe; Neal Beets hdk 1934@hotmaiLcom STEEL LAKE CREST MONS On August 15, I sent an e-mail to Kathy McOung and Deb Barker commenting on the Steel Lake Crest Preliminary Plat that I had reviewed. At that time, I observed that "the proposed center turn lane along the length of the project on 28th Avenue South doesn't solve the sight distance problem". I had no response from anyone, either verbal or written. Therefore, when I returned from a 10/3-10/10 trip out of town, I was surprised to see a MONS published in the October 4 FEDERAL WAY MIRROR. On October 11, I called city hall and Nas told Deb Barker was no longer working on this project and that it was transferred to Ms. Long-Woods. I spoke with ler and she told me that Deb Barker had written a letter on September 7 to Brant Schweikl in Tacoma and Mr. Schweikl Nas supposed to respond to my concerns. I said that to date, I had not received any response from Mr. Schweikl. Ms. _ong-Woods said she would mail me a copy of Ms. Barker's letter. I did not receive that copy in the mail and obtained >ne when I was in city hall on October 20. n light of the above, since I have had no response to my original concern from either the City of Federal Way or Mr. >chweikl to date, I feel "aggrieved of the city's final determination" and wish to halt the effective date of the MONS until ny concerns are resolved. L David Kaplan EXHIBIT -.Ji:L PAGE-L-OF --L- 97 Joanne Long-Woods From: Sent: To: Cc: Subject: Brant Schweikl [bschweikl@sacivil.net] Monday, October 20, 2008 4:23 PM Joanne Long-Woods Michael J. Cacciola Jr. Steel Lake Crest 07-1 03898-00-SE Joanne, We have compiled our comments and are submitting them to for clarification and the record. Findinas of Fact 4. The paragraph seems to place the emphasis specifically along the 1-5 ROW. According to the YVSDOI..a(".n'lsti~ 7 engineer the actual damping v~ of the trees is insignificant when if comes to meeting the noise requirement _The , number of trees remain is stafed as-1~ere it is stated as 8 trees in SEP A 11.d. 6. The file Number is ~7-103897-o0t.~Differs from City of Federal Way File No. 07-103898-o0-SE SEPA Conditions % 2. We had previously addressed how we intended to proceed with the noise mitigation measures to Ms. Bed Barker verbally via a tele hone conversation wI1ere she had re ue etermin .. ation was being proposed. We indicat 0 Ms. Barker t at we would be pursuing Exterior Construction Mitigation whicti1tlrie only really viable _,,& option. Dealing with WSDOT to construct a sound wall along the traveled way of 1-5 is neither economically nor r VA I logistically feasible. Although there is some talk of WSDOT and City of Federal Way proposing new City access off ramp IL ./L11It and over pass at 312th. If the constructions moves forward it is foreseen that WSDOT will include a concrete sound wall '1/Jpr along the freeway frontage of the parcel since the residential density of the parcel will above the cost benefit thresholds. Staff Evaluation of the Environmental Checklist 1.h A Temporary Ero~and Sedimentation Plan (TESCP) was never requested by the CRy, either by checklist submittal requiremen~erbally as best we can recall. 7 a. We concur that any hazardous materials shall be properly disposed of corre~~!l ~~,~: ~ould like t~ qity.to add a statement that "there have been no hazardous materials located onsite". 1w ""'I""'. Ir,.w....... IJ,J1tV ~ 7b. See SEPA Conditions 2 above. - 11.d See Finding of Facts 4 above. General Comments 1. Would it be possible to add the fact that the project has received an exemption from Shorelines as a manner of record for the p.ublic. \?\. S.~ ~. - Thank Your for Your Consideration, Respectfully, Brant Brant A. Schweikl, P .E. Managing Member Schweikl and Associates, PLLC 705 S. 9th Street, Suite 303 Tacoma, Washington 98405 PH: (253) 272-4451 FAUK: (253)272~95 bschweikl@SAcivil.net 1 EXHIBIT \-\'1- PAGE-LOF-L- 98 FILE ,,~ CITYOF -~~/ Federal Way CITY HALL 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.citvoffederalwavcom October 28, 2008 Mr. David Kaplan 30240 nth Avenue South Federal VVay, VVA 98003 RE: FILE # 07-103898-00-SE; RESPONSE To COMMENTS Steel Lake Crest Preliminary Plat, 3064228* Avenue South, Federal Way Dear Mr. Kaplan: Thank you for the comments you submitted on October 20, 2008, in response to the issuance of a Mitigated Determination of Nonsignificance (MONS) on the proposed Steel Lake Crest Preliminary Plat. You have stated in recent conversations that you submitted comments on this project when the Notice of Application was published in 2007. At that time, staff copied and distributed those comments to the Public VVorks Dept. and the applicant's engineer for evaluation. Your concerns were basically about the placement of the access roads and whether there was adequate sight distance at those locations. Based on your comments and internal review of the project, it was determined that the application, as submitted, did not meet minimum code requirements for site distance, and the applicant was asked to revise the design and the sight distance analysis. Your recent comments echo what your original comments were on this case: you are concerned about the location of the proposed access road for this plat off of 28th Avenue South. As you know, the original plat plan showed two accesses off of 28th A venue South, but as I stated above, internal review of the application identified that there was a site distance problem on the northerly access so it was removed from the plat. I forwarded copies of both of your comment letters to Sanjeev Tandle of the Public VVorks Department earlier this week. He explains in more detail the specifics of the review of this plat plan and why the design was changed. Below is his response to address your concerns: "The City's traffic division has originally reviewed the Steel Lake Crest preliminary plat application and the sight distance survey report dated July 11,2007, prepared by Schweikl & Associates, PLLC. The survey indicated that adequate sight distance was available at the proposed southerly access but adequate sight distance was not available at the proposed northerly access. The report indicated that approximately 350 feet sight distance was available compared to the required-J85 feet for a 35 mph speed zone. The report also indicated that providing a two-way left turn lane along the frontage of the property would mitigate this deficiency. The staff did not concur with those conclusions from the report for the following reasons: I. Providing a two-way left turn lane would not help improve the sight distance for the westbound to northbound egress movements at the north access. 99 EXHIBIT* PAGE--t-OF ~ . , 'M.w-Kap{an October 28. 2008 Page 2 2. Based on the approach grade of the proposed north access, the sight distance criteria to the south for the westbound left turn and right turn movements would be approximately 475 feet and 426 feet, respectively_ As these requirements were not met based on the submitted matenals, we concluded that it is unsafe to allow any egress movements from the north access. The staff required the applicant to provide other mitigation measures so that the sight distance criteria would be met at the north access. Based on the staff comments, the applicant revised the site plan to diminate the northerly access and reconfigured the plat to include only one site access. The applicant also submitted a revised sight distance analysis report on November 2,2007. Based on the revised sight distance analysis to reflect the revised plat configuration, the available sight distance at the proposed site access would be 505 feet to the north and 485 feet to the south. The required sight distance is 385 feet for a 35 mph speed zone. Therefore, the staff concluded that adequate sight distance is available at the proposed site access." I hope this additional information helps you understand how the plat design has changed and why. The City does not intend to modify the MONS issued on this case and it has been scheduled for a public hearing before the Hearing Examiner. The MONS was final on October 20,2008, and the appeal period ends 14 days from that date, or November 3,2008. As a party of record, you will be sent a formal notice of the hearing when s<<heduled.. You will be able to submit additional comments and/or testimony at the public hearing, if you choose to. If you have any questions, please contact me at 253-835-2640. ~ irt-~ Joanne Long-Woods, AlCP Senior Planner c: Brant Schweikl, Schweikl & Associates, PLLC, 705 South 9th Street, Suite 303, Tacoma, W A 98405 Linda Elder, 30642 28th Avenue South, Federal Way, W A 98003 01.10.\8'48 EXHIBIT l- PAGE ~~ 100 .. CITY OF "~ Federal Way <~~U=V)J CITY HALL 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway.com November 5, 2008 Brant Schweikl Schweikl & Associates, PLLC 705 9111 Street, Suite 303 Tacoma, W A 98405 RE: File #07-103898-00-SE; REsPONSE TO COMMENTS Steel Lake Crest Prel.i.miwiry Plat MDNS, 30642 28th Avenue South, Federal Way Dear Mr. Schweikl: Thank you for the comments you submitted on October 20, 2008, in response to the issuance of a Mitigated Determination of Nonsignificance (MONS) on the proposed Steel Lake Crest Preliminary Plat. I will respond to each statement in turn. as submitted: Findings of Fact L You state that the Finding #4 seems to place emphasis on 1-5 ROWand you quote a statement made by an employee of WSDOT about the value of trees in addressing noise requirements. The finding primarily' identifies what was in the submittal of the significant tree removal and replacement plan. The last sentence identifies that a majority of the large trees along the east side of the proposed plat will be removed. As for the statement from a WSDOT employee, I was not a party to a private conversation and have no knowledge of the employee or any statements made. No comments were received from WSDOT on this determination. 2. You identify a discrepancy in file numbers. The correct SEPA file number is #07-103898-OO-SE. The Subdivision file number is #07-103897- OO-SU. Thank you for pointing that out. It has been corrected in the findings document. SEP A Conditions You stated that you had had a conversation with Deb Barker about what noise mitigation measure would be utilized to mitigate for noise impacts from being adjacent to the 1-5 corridor. You a/so mentioned talk about a fUture transportation construction project between WSDOT and the City. I did find a resubmittalletter where you mention that the exterior construction method was the choice of the applicant. I will revise the staff findings to indicate that and include it into the staff report. EXHIBIT - ~ PAGE_LOF ~ 101 Mr. Schweikl November 5, 2008 Page 2 Staff Evaluation of the Environmental Checklist I. Comment noted. Will be required with submittal of engineered drawings. 2. Comment noted. The review does not say hazardous materials were found on the site. The buried materials were identified during soil test pit exploration and the consultant stated in his geotechnical report that no further exploration had been requested. 3. No additional comment identified. 4. No additional comment identified. General Comments You ask if the fact that the project had received an exemption from having to get a Shoreline Permit could be referenced. as a matter of record for the public. The shoreline exemption was acquired before submittal of this application. A copy of the exemption letter will be included with the packet of information to the Hearing Examiner and identified in the staff report. ~~Jj~ Joanne Long-Woods, AICP . Senior Planner c: Linda Elder, Steel Lake Crest Group, LLC, 30642 28th Avenue South, Federal Way, W A 98003 07.103898 EXHIBIT r PAGE~ '-':.-OF ~.~ Doc:. lD. 41SC8 102 J!!J Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Attn: Re: Mrs. Linda Elder: Subsurface Exploration/Geotechnical Engineering Report, Parcell's: 0921049182, 0921049096,0921049183 &: 0921049161 RE5UBM\1'TED V\A"{ S 0 L008 OF FEDERAL WAY C\~U\LO\NGDEPT. JUN CITY OF F BUll -D Mrs. Linda Elder 30642 28th Ave South Federal WayWA At your request, we have conducted a soils exploration and foundation evaluation for the above mentioned project The results of this investigation, and our recommendations, are to be found in the following report We have provided three copies for your review and distribution. During our exploration, nine test pits were advanced and soil samples submitted for laboratory testing from the project site. The data has been carefully analyzed to determine soils bearing capacities and footing embedment depths. The results of the exploration and analysis indicate that conventional spread and continuous wall footings appear to be the most suitable type of foundation for the support of the proposed structures. Some variability was encountered in comparing the soil profiles of the site. The onsite slopes appear to be manmade in parts and should be observed by a geotechnical engineer prior to concrete placement for foundation. Net allowable soil pressures, embedment depth, soil parameters, and total expected settlements have been presented for the site, later in the report Often, because of design and construction details that occur on a project, questions arise concerning soil conditions. We would be pleased to continue our role as geotechnical engineers during the project We appreciate this opportunity to be of service to you and we look forward to working with you in the future. H you have any questions concerning this report, the procedures used, or if we can be of any further assistance please call us at (206) '786-8645. EXHIBIT J PAGE--L-OF ~~ PO Box 181 Auburn WA 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jaaon@jasonengineer.com Page 2 of 23 103 J!!fj. ...... . ;./ I Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South. Federal Way File #: 07001-035 Table of Contents Table of Contents Investigation Information Introduction: Scope: General: Site Exploration Procedures General Notes: Drilling &: Sampling Procedures: Laboratory Testing Program: Site In.formation Project Description Climate of Area: Geology of Area: (AgB) Alderwood Gravelly sandy loam Description of Foundation Materials: Geoseismic Setting: Liquefaction Potential: Foundation Discussion & Recommendations General Notes: Foundation Design Recommendations: Lateral Earth Pressures: Structural Fill: Slope Impact Analysis: Groundwater Control: Construction Considerations Earthwork Excavations: Floor SJab-On-Grade: Erosion Control (typical of most sites) Pavement Design Recommendations Existing Subgrade: Crushed Surfacing: Asphalt Concrete Pavement Conclusion Appendix I: Test Pit Logs . Appendix II: Additional Site Photos Appendix Ill: Figures Vicinity Map SCS Soil Survey Information Site Plan Appendix IV: Pavement Design 3 4 4 4 4 5 5 5 5 6 6 6 6 6 7 8 9 9 9 10 10 11 11 12 12 12 12 13 14 14 14 14 14 15 20 21 21 21 22 23 EXHIBIT \f PAGE ~ OF~ PO Box 181 Auburn WA. 9807l Phone: (206) '786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com Page 3 of 23 104 Jg;J Jason Engineering &; Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &; Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 . Investigation Inforrnation Introduction: This report presents the results of a soils exploration and foundation analysis for the proposed new construction located at 30642 28th Ave South in Federal Way. The subsurface exploration and analysis determines the various soil profile components, the engineering characteristics of the foundation materials and provides criteria for the design engineers and architects to prepare or verify the suitability of the foundation design. This report was requested by Linda Elder. Written authorization to perform this exploration and analysis was provided by Unda Elder Scope: The scope of this geotechnical report and analysis included; a review of geological maps of the area, review of geologic and related literature, a reconnaissance of the immediate site, subsurface exploration, field and laboratory testing, and an engineering analysis and evaluation of the foundation materials to provide allowable bearing capacity, estimates of settlement, subgrade modulus, lateral earth pressure design values, geotechnical recommendations for site grading including site preparation, subgrade preparation, fill placement criteria, suitability of on-site soils as structural fill, drainage and erosion control measures, as well as an evaluation of landslide and erosion hazards at the site per the King County Critical Areas regulations. We were not requested to provide an Environmental Site Assessment for this property. Any comments concerning onsite conditionsand/ or observations, including soil appearances and odors~ are provided as general information. Information in this report is not intended to describe, quantify or evaluate any environmental concern or situation General: The exploration and analysis of the foundation conditions reported herein are considered sufficient in detail and scope to form a reasonable basis for the foundation design. Any revision in the plans for the proposed structure from those enumerated in this report should be brought to the attention of the soils engineer so that he may determine if changes in the foundation recommendations ale required If deviations from the noted subsurface conditions are encountered during construction, they should also be brought to the attention of the soils engineer. The soils engineer warrants that the findings, recommendations, specifications, or professional advice contained herein, have been promulgated after being prepared according to. generally accepted professional engineering practice in the fields of foundation engineering, soil mechanics and engineering geology. No other warranties are implied or expressed. This investigative report has been prepared for the exclusive use of Unda Elder and retained design consultants thereof. Findings and recommendations within this report are for specific application to the proposed project All recommendations are in accordance with generally accepted soils and foundation engineering practices. EXHIBIT ~ PAGE.~ OF...1:L..- PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com Page 4 of 23 105 J5j.. ::........ " I Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design & Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Site Exploration Procedures General Notes: The field exploration to determine the engineering characteristics of the foundation materials included a reconnaissance of the project site, excavating the test pits, performing field penetrometer and vane shear tests and recovering disturbed grab samples. A total of nine test pits were placed on the site. Test pits were advanced to 10 feet below the existing ground surface. Test pits were located by the field crew near as possible to the proposed building location. Schweikl and Associates supplied a site plan to locate the proposed building orientation and position the excavations. The test pits were located by the field technician by means of normal taping and pacing procedures and are presumed to be accurate to within a few feet After completion, the pits were backfilled with excavated soils and the site cleaned and leveled as required. The types of foundation materials encountered in the test pits have been visually classified and described in detail on the logs provided in the Appendix. The results of the field penetrometer and vane shear tests, moisture contents and other laboratory tests are presented on the logs. It is recommended that the logs not to be used for estimating quantities due to highly interpretive results. Drilling & Sampling Procedures: The test pits were performed with a conventional track excavator. Representative samples were obtained from the pits at various soil intervals. 1be samples obtained by this procedure were classified in the field by a soils technician, identified according to pit number and depth, placed in plastic bags to protect against moisture loss and transported to the laboratory for additional testing. Laboratory Testing Program: Along with the field investigation, a supplemental laboratory testing program was conducted to determine additional pertinent engineering characteristics of the foundation materials necessary in analyzing the behavior of the proposed building structure. 1be laboratory testing program included supplementary visual classification and water content determinations on all samples. In addition, selected samples were subjected to Moisture Content Analysis - 04959, and Grain Size Analysis - ASTM designation C-117, C-136. All phases of the laboratory testing program were conducted according to applicable ASTM Specifications and the results of these tests are to be found on the accompanying logs located in the Appendix. EXHIBIT :5 PAGE-Y:-OF -.n.. PO Box 181 Auburn WA. 9807l Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com Page 5 of 23 106 JBj Jason Engineering &; Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design &; Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Site Information Project Description The purpose of this. section is to enumerate details of the proposed structure. The following information was provided by the project engineer. The buildings will be a wood framed, single family residence structures. Daylight basements may be required in sloped areas. Conventional spread footings and slab-on-grade floors are contemplated. Differential settlements are limited to 3f4 inch A pavement section has not been requested but has been provided within this report The site of the proposed building addition upon which this soils exploration has been made is located at 30642 28th Ave South in Federal Way. The site topography consists of a slope on the West side of the lots that drops toward the. east The total vertical elevation difference is approximately 55 feet over the entire site. The slopes are located in the middle of the site and runs from NW to SE comers. The site drainage consists of surface runoff and natural seepage. The site vegetation is mostly deciduous trees with a few evergreens located on the east side of the lot Blackberry bushes, neddles, vine maples and Cedar trees are also present Prior grading has occurred on the east side of the lot near the existing houses. Climate of Area: The climate of the site and surrounding area as taken from the USDA Soil Conservation Service Survey consists of annual precipi!ation of 35 to 60 inches, most of which is rainfaU. between October and May. The mean annual temperature is about 50 degrees F. The frost free season is 150 to 200 days. Geology of Area: (AgB) Alderwood Gravelly sandy loam The geology of the western portion of the site as taken from the USDA Soil Conservation Service Survey consists of Alderwood gravelly sandy loam (AgB). Typical Alderwood soils are moderately well drained, undulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands and terraces formed under conifers in glacial deposits. This soil is nearly level and undulating, and moderately well drained. Water moves across the substratum in winter. These soils have a slowly permeable glacial till or glacial lake deposits at a depth of 16 to 40 inches and somewhat excessively drained, rolling, deep sandy soils on uplands and terraces. The horizon 0 to 6 inches in depth is usually dark brown The soil horizon from 6 to 12 inches is dark brown, grayish brown and dark yellowish brown The horizon 12 to 40 inches is consolidated and mostly grayish brown mottled with yellowish brown Some layers in this horizon slake in water. There is a consolidated substratum of till at a depth of 24 to 40 inches. Soils above the substratum are pervious when compacted. The surface layer is 2 to 3 inches thicker than the nearby soils to the south. Areas are irregular in shape and. slopes range from 0 to 6 percent Runoff is slow and the erosion hazard is slight The geology of the eastern portion of the site consists of Alderwood gravelly sandy loam (Age). Typical Alderwood soils are moderately well drained, undulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands and terraces formed under conifers in glacial deposits. Soil profiles are similar in type except permeability is moderately rapid in the surface layer and subsoil. However, it is very slow within the cemented layer and dense glacial till A perched water !able is as high as 18 to 36 inches at times from January through March Runoff is slow to medium and erosion hazard is moderate. Description of Foundation Materials: The soil profiles encountered were relatively consistent among most of the pits. It is to be noted that, whereas the test pits were placed and sampled by an experienced technici~ it is sometimes difficult to record changes in stratification within narrow limits. In the absence of foreign substances, it is also difficult to distinguish between PO Box 181 Auburn W A. 980'71 Page 6 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com EXHI~T \t 107 PAGE 5 OF tL.2 J!!J" " Jason ". / -:, Engineering &: Consulting I Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: (J7001-035 discolored soils and clean soil fills. It is recommended that the logs not to be used for estimating quantities due to highly interpretive results. The surface of the proposed construction site is covered with 6 to 12 inches of topsoil that should be removed prior to the start of any construction due to the high compressibility of these soils. Silty sand with gravel was encountered beneath the existing topsoil and exlended to depths beyond the scope of this investigation Unes of demarcation represent the approximate boundary between the soil types, but the transition may be gradual The top few feet consisted of a brown. silty sand with gravel, medium dense to dense. Below this was a gray to gray- brown gravel with sand and silt This layer was dense to very dense. The layers were fairly consistent with the depths varying between sample pits. In the area of sample pit #6, there was miscellaneous debris, fill, used tires and wood. No trash debris was found in the other sample pits. The total area and quantity of trash found in this area is uncertain and should be carefully observed during excavation to ensure all trash is removed. Geoseismic Setting: Foundation soils on this site are designated a Site Class C, from Table 1615.1.1 per the 2003 International Building Code (lB.C.). All building structures on this project should be designed per the Code Requirements for such a seismic classification These types of soils have a shear wave velocity in the range of 1,200 to 2,500 ftl see. The undrained shear strength is typically greater than 2000 psf with blow counts greater than 50 blows per foot The following may be used for the seismic coefficients. Sile class C 10 D 3 ~ c. ~ ,. " ~ ~ - S 320TII I ST I I ) ~ S 188TH ST EXPLA:\ATlO:\ . ~,"')'" ~ D D D D D ~,",..<~ ~ Site class F Reqttilt:, iiie-.pedrac in"~nigtlllOtl Site class E Site class DillE ,. " ~ -s. ;:! ;! '" .. Site cia." 0 Sile class C Sil" c1a.~s B 10 C Site class B EXHIBIT ~ PAGEJ.L.OF ~~ PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com Page 7 of 23 108 J!!j Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: WOOl-035 Design Response Spectrum c .e i I I.: f II: I 120.00 \ \ '" .......... --- '-- 100.00 80.00 60.00 40.00 20.00 0.00 0.00 0.20 0.40 0.60 0.80 PerIod, T 1.00 1.20 1.40 Period,. T Sa Sds Sma 0 0.00 40.0 To 0.05 100.0 100 150 Ts 0.26 100.0 100 150 1 1.00 26.0 2 2.00 13.0 . Sds and Sms values given at max acceleration Sm1 = 39, Sdl = 26 . Liquefaction Potential: Liquefaction is when saturated, cohesionless soils are temporarily turned in to a: liquid state usually from a seismic event If ground motion lasts for extended amounts of time, the grain to grain contact shifts and the grain structure can collapse. If the water within the soil cannot flow easily between the grain and out of a collapsing area, the water pressure increases. When pore pressures build up within the soil and exceed the effective contact pressure of the soil, the water can push the soil particles apart When the particles lose contact with each other, the soil mass can behave like a liquid. If pore pressures are great enough. water may discharge out of the ground like a geyser leaving characteristic signs, such as sand boils. Liquefaction is generally related to; soil characteristics, water table depths and the degree of seismic activity. The results are lower bearing capacities, increased settlement issues, landslides, and lateral spreading to name a few things. Liquefaction potential for this site is provided within the boundaries of the site. Seismic events which affect land masses on a greater scale are beyond the scope of this report. In our review we found no evidence of liquefaction of the soils in the immediate area from the 1949, 1965 and 2001 earthquakes. The site is located within the category III region of the Poverty Bay Auburn quadrangle liquefaction susceptibility map (GM-43) which has a VERY LOW susceptibility rating for liquefaction It includes all other Pleistocene glacial and non-glacial deposits and the Osceola Mudflow. Additional information on the site has been reviewed on Liquefaction Susceptibility Map provided by the Deparbnent of Natural Resources which rates the site as having a VERY LOW susceptibility to liquefaction EXPLANATION .. D D D D 0].,.,,, .......j.'..).',)'.... ......,::!,,:' ~....<. L:.;jSj Liquefaction susceptibility: fIIGH Liquefaction s',"ceptibility: MODERATE to HIGH Liquefaction susceptibility: \10DERAfE l.iquefaction sus':eplihility: l.0\1I' 10 MODERATE Liquefaction su.'it:t:ptibility: l.OW l.iquefaction su.o;c'lltibility: VERY LOW to LOW Liquefaction susceptibility: VERY LOW PO Box 181 Auburn W A. 98071 Page 8 of 23 Phone: (206) 7~5 Fax: (253) 833-7316 Email: Jason@jasonengineer.com EXH BIT J 109PAGE-1-0F 1,1 ~ Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design & Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #:07001-035 Foundation Discussion & Recommendations General Notes: Various foundation types have been considered for the support of the proposed building structure. Two requirements must be fulfilled in the design of foundations. First, the load must be less than the ultimate bearing capacity of the foundation soils to maintain stability; and secondly, the differential settlement must not exceed an amount that will produce adverse behavior of the superstructure. The allowable settlement is usually exceeded before bearing capacity considerations become important; thus, the allowable bearing pressure is normally controlled by settlement considerations. Considering the subsurface conditions and the proposed construction,. it is recommended that the structure be founded upon conventional spread and continuous wall footing foundations. Settlements should not exceed tolerable limits if the following design and construction recommendations are observed. Foundation Design Recommendations: On the basis of the data obtained from the site and the test results from the various laboratory tests performed, we recommend that the following guidelines be used for the net allowable soils bearing capacity. Ground Surface 18.0 inch min. required for freeze-thaw Footing Depth: 18inches I tllwlF g / Bearing Capacity: 2,000 PSF IJo All footings are to be excavated to and placed on native undisturbed soils (gray gravel with sand and silt) or compacted structural fill. Footings are required to be a minimum of 18 inches below grade for freeze thaw purposes. After excavation, compact any loose surface soils with a jumping jack compactor. These soils shall be confirmed for bearing capacity and verified by the soils engineer after excavation. IJo After excavation, compact the surface with a jumping jack compactor. Confirm compaction of the native soils and that all soft spots have been removed and replaced with suitable fill material and compacted to least 95~ of the maximum dry density as determined by ASTM 0-1557. It- Continuous wall footings should be a minimum of 18 inches in width and any slab for the proposed building should be suitably reinforced and connected to the footings so as to limit the effects of differential settlement and to provide some degree of uniform settlement ability for the building should the site undergo liquefaction during a major seismic event PO Box 181 Auburn WA. 98071 Page 9 of 23 Pho"", (206) -.; Fa>c (253) 833-7316 Emalli Jason@jaoonengl"EXHIBIT l' PAGE~OF 1,,1 110 J!!j Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Cres~ 30642 28th Ave South, Federal Way File #: 07001-035 It- In the area of sample pit #6, there was miscellaneous debris, fill.. used tires and wood. No trash debris was found in the other sample pits. The total area and quantity of trash found in this area is uncertain. Footing excavation should be carefully observed during excavation on the sloped area to ensure all trash is removed and the native soils are found. If' 1he use of on-site soils as structural fill is acceptable. If these soils are to be used for structural fill, laboratory samples will need to be taken for grain size analysis and moisture-density relationships. Structural fill shall be compacted to at least 95% of maximum density per ASlM D1557 in footing areas. The footings should be proportioned to meet the stated bearing capacity and/or the International Building Code 2003 minimum requirements. Total settlement should be limited to 1 inch total with differential settlement of 3/. inch. Any excessively loose or soft spots or areas that do not meet the compaction requirements that are encountered in the footing subgrade will require over-excavation and backfilling with at least 1 foot of structural fill In order to minimize the effects of any slight differential movement that may occur due to variations in the characters of the supporting soils and any variations in seasonal moisture contents, it is recommended that all continuous footings be suitably reinforced to make them as rigid as possible. It is recommended that the services of our firm be engaged to test and evaluate the soil conditions during the construction phase of the project. The design values and recommendations made herein are valid only insomuch as they are followed during the construction phase. Additionally, monitoring and testing during the construction phase needs be performed to verify the sub grade conditions and that suitable materials are used and that they are properly placed and compacted. Lateral Earth Pressures: Lateral earth pressures are dependent upon the backfill materials and their configuration and moisture content 'Three inch minus sand and gravel mixtures that are free draining are recommended for backfilling walls greater than four feet tall Below grade retaining walls or walls designed for retaining earthen fills on this project may use the following values for design. Values were obtained based on a unit weight of 130 pef, and a phi angle of 34 degrees. Earth Pressure Coefficients Active, 1<..: 0.283 At Rest,. Ko: 0.441 Passive, Kp: 3.537 Earth Pressure Active: 37 At Rest 57 Passive: 460 Coefficient of FrictiOIC 0.35 lbs. / fts lbs. / ft3 lbs. / ft3 Structural Fill: Structural fill should consist of a 3 inch minus select, clean,. granular soil with no more than 5% fines (-#200). Suitable structural fill should consist of material that meets one of the following specifications, WSOOTSection 9- 03.10 Aggregate for Gravel Base, WSOOT Section <J.-03.14(1) Grave! Borrow, WSOOT Section 9-03.14(2) Seloct Borrow, WSDOT Section 9-03.9(3) Crushed Surfacing (Base Course Specs), WSDOT Section 9-03.9(3) Crushed Surfacing (fop Course Specs), APW A Class A Pit Run,. or APW A class B Pit Run. Material that does not meet one of the specifications should be submitted with sieve analysis results for approval prior to placement The fill should be placed in lifts not to exceed 12 inches in loose thickness. Each layer of structural fill should be compacted to a minimum density of 95% of the maximum dry density as determined by ASlM designation 0-1557. For structural fill below footings, the area of the compacted backfill must extend outside the perimeter of the foundation for a distance at least equal to the thickness of the fill between the bottom of the foundation and the PO Box 181 Auburn W A. 98071 Page 10 of 23 Ph."" (206)786.8645 Fax: (253) 833-7316 Emalli ,..oo@jasEXtU IT ~ PAGE , OF~ 111 ~~...". Jason '< Engineering &: Consulting . I BU8~es8,In~ Geotechnical Engineering Retaining Structures Project Management! Inspection Pavement Design &: Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South. Federal Way File #: 07001-035 underlying soils. H it is elected to utilize a compacted backfill for the support of foundations, the subgrade preparation and the placing of the backfill should be monitored continuously by a qualified engineer or his representative so that the work is performed according to these recommendations. Slope Impact Analysis: Sample pits placed near the sloped portion of the site appear to less dense in the upper layers those observed at lower areas farther to the east of the site. It is likely the existing slope was modified, especially in the area of test pits #6 and #7 where debris was found Footing excavation should be carefully observed during excavation on the sloped area to ensure alllrash is removed and the native soils are found. Re-grading of the slopes wiD be necessary to reach native competent soils for a solid foundation Excavation into the slope may increase the steepness of the existing slope and require houses in this area to be of a daylight basement structure. We do not anticipate that the proposed. residential structure and construction of the project will have any off-site impacts. On-site care should be taken during construction to make sure that runoff caused by wet weather is directed away from all open excavations. TI1e site is stable enough to support the proposed residential construction within the recommendations ma.de herein. TI1ere were no signs of previous slope instability or failures. Groundwater Control: Groundwater was not encountered when the field exploration was conducted A seep was noted only in sample pit #1. Groundwater is not expected to cause difficulties during construction of this project It is recommended that runoff caused by wet weather be directed away from all open excavatioll!"- The on-site silty soils can be expected to become soft and pump if subjected to excessive traffic after becoming wet during periods of bad weather. This can be avoided by constructing temporary or permanent driveway sections should wet weather be forecast. The on-site drainage (roof drains &: catch basins for pavement areas) should be collected and directed away from the property. This can be accomplished by tight-lining the drainage to the approved storm drainage system. Retaining walls should contain at least 12 inches of free draining material behind the wall as well as a 6 inch perforated drainpipe at the bottom of the wall to alleviate any pressure buildup. Connect the drainpipe to the on site storm drainage system. EXHIBIT ~ PAGEJcLOF !J,2 PO Box 181 Auburn WA. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com Page 11 of 23 112 J5J Jason Engineering & Consulting Business, Inc. Geotechnical Engineering '. Retaining Sbudures Project Management / Inspection Pavement Design & Analysis Date: 6-~2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File I: (J7OO1-035 Construction Considerations Earthwork: Excessively organic top soils generally undergo high volume changes when subjected to loads. 1ms is detrimental to the behavior of pavements, floor slabs, structural fills and foundations placed upon them. It is recommended that excessively organic top soils be stripped from these areas to depths of 6-12 inches and wasted or stockpiled for later use. Exact depths of stripping should be adjusted in the field to assure that the entire root zone is removed. It is recommended that the final exposed subgrade be inspected by a representative of the soils engineer. This inspection should verify that all organic material has been removed. Any soft spots or deflecting areas should be removed to sound bearing and replaced with structural fill Once the existing soils are excavated to the design grade, proper control of the subgrade conditions (ie., moisture content) and the placement &: compaction of new fill (if required) should be maintained by a repreSentative of the soils engineer. 1l1e recommendations for structural fill presented within this report, can be utilized to minimize the volume changes and differential settlements that are detrimental to the behavior of footings, and floor slabs. Enough density tests should be taken to monitor proper compaction. For structural fill beneath building structures one in-place density test per lift for every 1,000 ft2 is recommended. In parking and driveway areas this can be increased to two tests per lift for every 1,000 ft2. Excavation equipment may disturb the bearing soils and loose pockets can occur at bearing levels that were not disclosed by the test pits. For this reason,. it is recommended that the bottoms of the excavations be compacted in- place by vibratory compactors. The upper 12 inches should be recompacted to achieve an in-place density of not less than 95% of the maximum dry density as determined by ASlM 0-1557. Excavations: Shallow excavations required for construction of foundations that do not exceed four feet in depth may be constructed with side slopes approaching vertical. Below this depth it is recommended that slopes not exceed one vertical to one horizontal. For deep excavations, the soils present cannot be expected to remain in position. These materials can be expected to fail, and collapse into any excavation thereby undermining the upper soils materials. This is especially true when working at depths near the water table. Proper care must be taken to protect personnel and equipment Care must be taken so that all excavations made for the foundations are properly backfilled with suitable material compacted according to the procedures outlined in this report Before the backfill is placed, all water and loose debris should be removed from these excavations. This information is provided for planning purposes. It is our opinion that maintaining safe working conditions is the responsibility of the contractor. Jobsite conditions such as soil moisture content,. weather condition,. earth movements and equipment type and operation can all affect slope stability. All excavations should be sloped or braced as required by applicable local, state and federal requirements. Floor Slab-On-Grade: Before the placing of concrete floors or pavements on the site, or before any floor supporting fill is placed, the organic, loose or obviously compressive materials must be removed. The subgrade should then be verified by the geotechnical engineer or his representative that all soft or deflecting areas have been removed. Areas of excessive yielding should be excavated and backfilled with structural fill PO Box 181 Auburn W A. 980'71 Page 12 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com E)~H~iB~T---L 113 PAGE-LLOF.:J:k.. J5J" '. Jason '< Engineering & Consulting '. . , Business, Inc~ Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Any additional fill used to increase the elevation of the floor slab should meet the requirement for structural fill. Structural fill should be placed in layers of not more than 12 inches in thickness, at moisture contents at or above optimum, and compacted to a minimum density of 95~ of the maximum dry density as determined by ASlM designation D-1557. A granular mat should be provided below the floor slabs. This should be a minimum of four inches in thickness and properly compacted. The mat should consist of sand or a sand and gravel mixture with non-plastic fines. All material should pass a 3/4 inch sieve and contain less than 10~ passing the #200 sieve. Groundwater can be expected at shallower depths during the winter months. A moisture barrier, such as visqueen or plastic sheeting, may be placed beneath all floor slabs that are within a foot of the water table, as determined during excavation. Erosion Control (typical of most sites) 1. The implementation of these ESC plans and the construction. maintenance, replacement, and upgrading of these ESe facilities is the responsibility of the owner/ESC supervisor until all construction is approved. 2 The boundaries of the clearing should be clearly flagged by a continuous length of survey tape (or fencing, if required) prior to construction. During the construction period, 00 disturbance beyond the clearing limits shall be permitted. The clearing limits shall be maintained by the owner/ESe supervisor for the duration of construction. 3. The ESe facilities are to ensure that the transport of sediment to surface waters, drainage systems, and adjacent properties is minimized. 4. The ESe facilities shown on this plan are the minimum requirements for anticipated site conditions. During the construction period, these ESe facilities shall be upgraded as needed for unexpected storm events and modified to account for changing site conditions (e.g., additional sump pumps, relocation of ditches and silt fences, etc.). 5. The ESe facilities shall be inspected daily by the owner/ESe supervisor and maintained to ensure continued proper functioning. 6. Any areas of exposed soils, including roadway embankments, that will not be disturbed for two days during the wet season or seven days during the dry season shall be immediately stabilized with the approved ESe methods (e.g., seeding, mulching, plastic covering, etc.). 7. The ESC facilities on inactive sires shall be inspected and maintained a minimum of once a month or within forty-eight (48) hours following a storm event 8. At no time shall more than one (1) foot of sediment be allowed to accumulate within a catch basin. All catch basins and conveyance lines shall be cleaned prior to paving. The cleaning operation shall not flush sediment-laden water into the downstream system. 9. Stabilized construction entrances and roads shall be installed at the beginning of construction and maintained for the duration of the project Additional measures, such as wash pads, may be required to ensure that all paved areas are kept clean for the duration of the project 10. Any permanent flow control facility used as a temporary settling basin shall be modified with the necessary erosion control measures and shall provide adequate storage capacity. H the facility is to function ultimately as an infiltration system, the temporary facility must be graded so that the bottom and sides are at least three feet above the final grade of the permanent facility. 11. Where straw mulch for temporary erosion control is required, it shall be applied at a m.inimum thickness of 2 to 3 inches. 12 Prior to the beginning of the wet season (Oct 1), all disturbed areas shall be reviewed to identify which ones can be seeded in preparation for the winter rains. Disturbed areas shall be seeded within one week of the beginning of the wet season. PO Box 181 Auburn WA 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com EXH BIT ]' PAGE~OF ~ Page 13 of 23 114 J!!J Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File I: (17001-035 Pavement Design Recommendations On the basis of the results of laboratory tests and the assumed traffic counts of the proposed project, the pavement profile should consist of the following recommendations: Existing Subgrade: 1) All subgrade preparation work to be performed should be monitored by a representative of our firm. 2) Over-excavate any areas that exhibit pumping of the subgrade soils at least 12 inches (or as directed by a representative from our firm). Replace with gravel base material If subgrade is saturated or pumping excessively after over-excavating then it may be necessary to place quarry spalls on the subgrade prior to placement of any gravel base material 3) On the basis of the existing soils type, the onsite conditions, and the anticipated traffic conditions we recommend that the existing subgrade being compacted to 95~ of the maximum dry density as determined by ASTM 0-1557 (Modified Proctor). 4) Under certain site conditions the existing subgrade can be accepted by proof-rolling the subgrade using a fully loaded dump truck. This procedure (if used) should be witnessed and accepted by a representative of our firm. 5) A geotextile fabric (if used) should be placed upon the approved subgrade to maintain the structural integrity of the pavement profile. The fabric should be a type of fabric specifically made for use in road construction Crushed Surfacing: 1) The layer of crushed surfacing material should consist of 6 inches of WSDOT Section 9-03.9(3) Crushed Surfacing (Base Course Specs) that is placed and compacted to 95% of the maximum dry density as determined by ASlM 0-1557 (Modified Proctor). 2) AU of the crushed surfacing and Gravel Base material could at the contractor's option consist of WSDOT Section 9-03.9(3) Crushed Surfacing (Top Course Specs) that is placed and compacted to 95% of the maximum dry density as determined by ASTM 0-1557 (Modified Proctor). 3) The material should be placed in lifts not to exceed 6 inches, with each lift being compacted and verified. 4) The crushed. surfacing material should be placed to provide the proper grade and drainage for the asphalt pavement Asphalt Concrete Pavement: 1) The asphalt pavement should consist of at least 3.0 inches of WSDOT Class B asphalt that is placed and compacted to at least 91" of the theoretical maximum density as determined by ASTM 0-2041 (Rice Method). 2) Provide a tack coat on all concrete surfaces that the pavement will be placed against, and for multiple lifts that are not placed within an hour time period. Conclusion All footings are to be placed on native undisturbed soils (gray gravel with sand and silt). The existing slope appears to be manmade in locations and should be excavated to native soils foundation placement When the plans and specifications are complete, or if significant changes are made in the character or location of the proposed structures, a consultation should be arranged to review them regarding the prevailing soil conditions. Then, it may be necessary to submit supplementary recommendations. While the recommendations made herein are considered sufficient in detail for the construction of the proposed project, there are many alternative methods of construction which are available. We can discuss various other options for construction at your request PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com EXHIBIT 1" PAGE~OF ~ Page l40f23 115 J!!jJ /.... //-:- , Jason Engineering &: Consulting Business, Ine. Geotechnical Engineering Retaining Structures Project Management lInspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Appendix I: Test Pit Logs L #1 og Boring ID: SP-1 Method of Sample: Track Excavator Date of Excavation: 5-5-2007 Surface Elevation (ft): 455 Project Name: Steel Lake Crest Total depth (ft): 10 File #: 07001-035 Technician: JECB Depth(ft): (feet) (meters) 1 0.30 2 0.61 3 0.91 Profile uses SPf (N) Moisture (blows/ft) % Percent passing 3/4" #4 #200 Sample Description Type 4 5 6 7 8 9 10 122 . 1.52 1.83 2.13. ~.qM 2.44 2.74 3.05 End Boring topsoil brown silty sand with gravel, medium dense water seep noted at 4 fl. slow flow 75 52 12 grab gray brown gravel with sand and silt,. dense Log #2 Boring ID: Date of Excavation: Project Name: File t#: SP-2 5-5-2007 Steel Lake Crest 07001-035 Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 445 10 JECB Depth(ft): (feet) (meters) 1 0.30 2 0.61 3 0.91 4 122 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Boring Profile uses SPf (N) (blows/ ft) Moisture % Percent passing 3/4" #4 #200 Sample Description Type topsoil brown silty sand with gravel, medium dense No watt'.. visible 75 52 12 grab gray gravel with sand and silt, very dense Gr.: PO BoxlS1 Auburn WA. 98071. Phone: (206) 786-8645 Fax: (253) 833-7316 EmaiI: Jason@jasonengineer.com Page 15 of23 116 EXHIBIT ~ PAGE~OF ~'1. cr~ ~ Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design. It Analysis Date: 6-20-2007 Prqject Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo #3 Boring In: Date of Excavation: Project Name: File #: Depth(ft): Profile (feet) (metelS) uses 1 0.30 2 0.61 3 0.91 4 122 5 1.52 6 1.83 7 213 ~~^ 8 244 9 274 10 3.05 End Boring Lolt #4 Boring ID: Date of Excavation: Project Name: File #: SP-3 5-5-2007 Steel Lake Crest 07001-035 SYI (N) (blowsl ft) Moisture Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: % Percent passing 3/4" #4 #200 Sample Description Type Track Excavator 443 10 JECB topsoil brown silty sand with gravel, medium dense % Percent passing 3/4" #4 #200 Sample Description Type SP-4 5-5-2007 Steel Lake Crest 07001-035 No water visible 75 52 12 grab gray gravel with sand and silt, very dense Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 440 10 JECH Depth(ft): (feet) (metelS) 1 0.30 2 0.61 3 0.91 4 122 5 1.52 6 1.83 7 213 8 244 9 274 10 3.05 End Bo . Profile uses GP'-Gl\( SYI(N) (blows/ft) Moisture topsoil brown silty sand with gravel, medium dense No water visible 75 12 grab gray gravel with sand and silt, very dense 52 Page 16 of23 PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Entail: Jason@jasonengineer.com 117 EXHIBIT ~ PAGE~OF -.n.. ,,~.... ~ Jason Engineering &: Consulting Business, Ine. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo~ #5 Boring ID: Date of Excavation: Project Name: File #: SP-5 5-5-2007 Steel Lake Crest 07001-035 Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 440 10 JECB Depth(ft): Profile (feet) (metelS) uses 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 213 cr. 8 2.44 9 274 10 3.05 End Boring Moisture % SPT (N) (bIows/ ft) Lo #6 Boring ID: Date of Excavation: Project Name: File It: SP-6 5-5-2007 Steel Lake Crest 07001-035 Depth(ft): Profile (feet) (meters) uses 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 213 8 244 9 274 10 3.05 11 3.35 12 3.66 CltoQ.( End Boring SPT(N) (blows/ ft) Moisture % Percent passing 3/4" #4 1#200 Sample Desoiption Type topsoil brown silty sand with graveL medium dense 118 75 52 12 grab gray gravel with sand and silt, very dense Track Excavator 444 12 }ECB Fill material, gravel with sand and silt used tires, wood debris 75 12 grab gray gravel with sand and silt, very dense PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com EX IBITl PAGEJLOF ~~ No water visible Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Percent passing 3/4" #4 1#200 Sample Description Type topsoil 52 Page 17 of 23 ~........... .. . '//. , Jason Engineering &: Consulting Business, Ioe. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo #7 Boring ID: Date of Excavation: Project Name: File #: SP-7 5-5-2007 Steel Lake Crest 07001-035 Depth(ft): (feet) (meters) 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Borin Profile uses SPT (N) Moisture (blows/ft) % Lot! #8 Boring In: Date of Excavation: Project Name: File #: SP-8 5-5-2007 Steel Lake Crest 07001-035 Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Percent passing 3/4' #4 #200 Sample Description Type Track Excavator 446 10 JECB topsoil brown silty sand with gravel. medium dense Percent passing 3/4' lt4 #200 Sample Description Type No water visible 75 52 12 grab gray gravel with sand and silt, dense Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 457 10 JECB Depth(ft): (feet) (meters) 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Boring Moisture % Profile uses SPT (N) (blows/ft) topsoil brown silty sand with graveL medium dense No water visible 75 12 grab gray gravel with sand and silt, dense 52 PO Box 181 Auburn W A 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com 119 Page 18 of 23 EXHIBIT PAGE-D-OF \f s.~ J!!jJ Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/ Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo~ #9 Boring ID: Date of Excavation: Project Name: File II: SP-9 5-5-2007 Steel Lake Crest 07001-035 Method of Sample: SUlface Elevation (ft): Total depth (ft): Technician: Track Excavator 465 10 JECB Depth(ft): Profile (feet) (meters) uses 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Boring SPT (N) Moisture (blowsl ft) % Percent passing Sample Description 3/4" 14 #200 Type topsoil brown silty sand with gravel, medium dense No water visible 75 52 12 grab gray gravel with sand and silt, very dense GP-GM (orange), is consistent same material GP-GM (pink), 75-52-12 is consistent same material Variability between test pits is depth of material encountered. EXHIBIT PAGE PO Box 181 Auburn W A. 9807l Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com 120 ~ JI!!j Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design &: Analysis. Date: 6-20-2007 ~ Steel Lake Crest. 30642 28th Ave South, Federal Way File #: 07001-035 Appendix II: Additional Site Photos I: Test pit with typical very dense, gray gravel with sand and silt. 2: Sample pit #6 with used tires and debris found down to 10 ft. 3: Composite view of site looking north from the south east comer EXHIBIT PAGE PO Box 181 Auburn WA. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com 121 J3J Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design & Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: WOO1--035 Appendix III: Figures Vicinity Map ~ .- ~ -'" . .., ; 't. , . . "'. .'-~ \ l .. i ':. I. I -:-fJ .. ~ i j .,'" ..., -- j/*~ S:ll:2nfSt:., . i "\ . . /I ... _J, _ SDahSt ~ ,- SattBf fQB'~S1 i ~ ....... S :tJb ar -..- SDiltf-.- ~ " f Ii t ~ .. . ~ .-... ~ " .li !" \ .. ~ II ~l' i ! ,. ,-.. .. i 3T2dIS1 t 4 .. t f' " ........ .'t-; i -I' . i i = is!t!Sltt!t-~ 8.:11..,. . s"",",-"- $...91. . S 317* SI 8311ft'" ,. Sc. SCS Soil Survey Infonnation t. ;,., ~. I'-,\" ~ I< . . en ~~ " ~ .. .. i ~ .. i .-lta-g.-~ ........, 531....- I, .. i A I _0 ......~ .,tf# .2IMdI- '," c.......... , .-- '(If <<t .11/II-' ... & a: ~ 4 # i i !t "~~ k ; 5ll....,. ~ ~ S~SI , "t .. , !=- i S2!llWt,8t. .. " 4......- S__St .. 'Q. ~ i i i j .. ... .... ...'." .',. _I "___ S JlIIII,saI .-- .. t- ,- ~ i . ",f ...._ i ~ S-102IIctpt-- '-.. , 2 1_"''' r .. .. .. . ! ~ .. ! t 11'-;-- ~ "",""%"i .. i S . , I",. .,. .. g"''' " i .1.10" i - .. J i 9"". I ~ ..,. .-.. s... :$ Jqa... .. i ~ ~. .. ~31CIl91 Sl15lftP, ~ i S J ~ S 11M-.'" liO 83_ '" s 3mII Sf PO Box 181 Auburn W A. 9807l Page 21 of 23 I'Iu>ne (206) 1IlIHl645 Paoc (253) 833-7316 Emalli J..on@j"onengineer~ I B IT \f 122 PAGE 10 OF ~ 'Ili';::"! 'di ,tS2:) .~~I.. St,qH..qHL (90(;) :.1lHl4d. 1;'()Hfl \/\\ lunqnV I~L<,;oA (l(i )t'l 'ssa. u!s. ..n8~7fD st. .SAleuv ,,<dl!""O luaw,...ed liU!Il"su,,:> SUO!Jepuno:J '51 \jU!~";)U!jju3 911eM ~!"'''H uosel lfll!J"""lSurr ~3aJO"9 %06to ItIiG 't816t01UO 'II Sp:1IOd 1~tHU:-m -lid V/d'.(o/d"",,, _"WlfIIllt9Ol" .l.S!I1D !DIVl1lJi1.LS I-< ~t ~~BI / ~~! it. ~~tt'd. Q /Cf) . 123 ~~~~ ~~l'i II "'..1" J! '" ""J/> J .~ ~~~dl~ II j~~ l>.~~ .9 . 0 Vi:"'~ liolill il~tf :0 <( 5: 21 <(u- _0 8S~ ~ ~~ I I I -t-o I I I , I 1 :>>' ~v. , j . I 3~ I L___J r--- ~ , ~-j/ )I ./1-<;( . ~.~ 3~_ .-/ --- : r r ._-~ u. ~! I b~ I ., ..... : I L___J I r--- / / . I !::JI(/ : I ..........t5~ .--- .....~ --_J """ ::=!L PAGE~OF ~ J3J Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th A ve South, Federal Way File #: 07001-035 Appendix IV: Pavement Design AASHTO Pavement Section Design Project Location: Steel Lake Crest Average Daily Traffic Count: 500 All Lanes &: Both Directions Pavement Design Life: 20 Years % of Traffic in Design Lane: 100'X. Terminal SeviceabiUty Index (Pt): 2.0 1...1 Level of Reliability: ~ Expected Growth Rate: 2.0% Subgrade CUR Value: 20 Subgrade Mr 30,000 Calculation of Design 18 kip ESALs Daily Traffic Load Design Breakdown Factors ESAL's Passenger Cars: 153 0.0008 1,085 Buses: 3 0.6806 15,090 Panel &: Pickup Trucks: 38 0.0122 4,057 2 Axle, 6 Tire Trucks: 10 0.1890 16,762 Concrete Trucks: 0 4.4800 2,980 Dump Trucks: 20 3.6300 643,856 Tractor Semi Trailer Trucks: 25 2.3719 525,882 Double Trailer Trucks 1 2.3187 20,563 Heavy Trador Trailer Combo Trucks: 1 2.9760 26,393 Average Daily Traffic in Design Lane: 250 Total Design Life 18 kip ESAL's: Actual Log (ESALts): Trial Log (ESAL's): Trial SN: Asphaltic Concrete: Asphalt Treated Base: Cement Treated Base: Crushed Aggregate Base: Existing Aggregate Subgrade: Pavement Section Design SN: 1,256,668 6.099 6.100 2.22 OK Design Depth Structural Inches Coefficient Drainage Coefficient n/a nfa nfa 1.0 1.0 3.00 0.00 0.00 6.00 2.00 0.42 0.25 0.17 0.14 0.11 2.32 OK PO Box 181 Auburn W A. 98071 Page 23 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com -!t' EXHIBIT \J PAGE 2.' OF .1--~ 124 ENVIRONMENTAL NOISE REVIEW Steel Lake Crest Plat 30642 28th Ave S Federal Way, Washington Prepared for: Brant Schweikl Schwejkl & Associates, PLLC 705 South 9th Street, Suite 303 Tacoma, WA 98405 Prepared by: SSA Acoustics, LLP 222 Etruria Street, Suite 100 Seattle, Washington 98109 June 1, 2007 EXHIBIT ~ PAGE-LOF ~ ACOUSTICS . S S C^" ACOUSTiCS ,"CQUSTlCS -GSTICS Stewart. Air AI/aoua . Perkins ACOlJSTiCS ACOOST! .i\cousncs ACOllSnC~COUSl'lCS RECEI~Sfl 125 JUL 1 6 2007 C~8E&~8\\~)~AY CONTENTS INTRODUCTION................ ............. ..................................................................... 3 DESCRI PTORS .......... .................... ................................. .................................... 3 NOISE GU IDELI NES ............. ....................................................................:......... 4 MEASUREMENT DESCRIPTION.. .............. ............................. ......... .... .............. 5 MEASUREMENT RESULTS... ................. .......... ....... .............. ............. ........... ..... 6 RECOMMENDATIONS ................................ ........................................................ 7 SUMMARy..................................................................... ................ ............ ........ 11 APPENDIX I ....................................................................................................... 12 Federal Interagency Committee on Urban Noise............................................ 12 APPENDIX II ................................... .................................. ............. ............... ..... 14 EXHIBIT ~ PAGE 1, OF 126 Steel Lake Crest Plat SSA Acoustics, LLP Job #: 07-2201 Page 3 of 14 INTRODUCTION The following report presents the results of the environmental noise study conducted for the proposed residences at 30642 28th Avenue South in Federal Way, Washington. The report presents measurement results, guidelines and criteria for residential noise levels and mitigation measures to meet the criteria. DESCRIPTORS Sound consists of minute vibrations, which travel through a medium, such as air, and are sensed by the human ear. The ear perceives these vibrations as changes in pressure and as a result sound levels are often referred to as "sound pressure levels." Sound levels are expressed in units of decibels. The term decibel implies a logarithmic ratio of the measured pressure to a reference pressure. The reference pressure refers to the lower threshold of perceptibility by the human ear. The human ear responds differently to sounds at different frequencies. This is demonstrated by the fact that we hear higher pitched sounds more easily than lower ones of the same magnitude. To compensate for the different "loudness" as perceived by humans, a standard weighting curve is applied to measured sound levels. The weighting curve represents the frequency response of the human ear and is labeled as dBA ("A" weighted decibels). Sound levels vary significantly depending on location and activities. People normally experience sound levels between about 30 and 90 dB(A), depending on their activity. For example, a nearby noisy vehicle, radio or power tool may produce 90 dB(A); normal oonversation is about 55 to 65 dB(A); and a bedroom or quiet office is about 30 to 40 dB(A). The table below approximates human sensitivity to changes in sound level. Table 1 Changes In Sound Level . Change in Sound Level (dB) 1 3 6 10 20 Change in Apparent Loudness Imperceptible (except for tones) Perceptible Significant Twice (or half) as loud 4 times (or one-forth) as loud When measuring noise that is fluctuating over time, such as traffic noise, it is common practice to use a descriptor called the equivalent A-weighted sound level, Leq. Th~ Leq is the constant sound level in dB(A) which contains the same amount of sound energy over a given time period as the actual measured fluctuating noise event. Equivalent A-Weighted Noise Level, LEQ Leq, equivalent sound level, is the level of a constant sound that, over a given time period, contains the same amount of sound energy as the measured fluctuating sound; Day-Night A-Weighted Average Noise Level, Ldn or DNL DNL or Ldn, day-night average sound level is a descriptor that describes the continuous sound exposure for a 24 hour period with a 10 dBA adjustment added to sound levels occurring during nighttime hours (10 PM and 7 AM). 222 Etruria Street. Suite 100. Seattle, WA 98109 Tel: 206.839.0819 Fax: 206.839.0824 EXHIBIT ~ PAGE ~ OF-C:L 127 Steel lake Crest Plat SSA Acoustics, llP Job #: 07-2201 Page 4 of 14 NOISE GUIDeliNES The Department of Housing and Urban Development Noise Standards consider outdoor Day-Night Average Sound levels (ldn) below 65 dBA uacceptable- and Ule indoor Day-Night Average Sound level (ldn) goal is to not exceed 45 dBA 1. Normal construction can be expected to provide a Noise level Reduction (NLR) of 20 dB, thus the indoor goal of ldn less than 45 dBA can be met when the outdoor ldn is less than 65 dBA. Additional infonnation about the guidelines for considering noise in land use planning and control is included in Appendix I. 1 HUD Chapter 2: The Noise Regulation, 51.101 (9) Interior Noise Goals EXHIBIT PAGE. q 222 Etruria Street. Suite 100. Seattle, WA 98109 Tel: 206.839.0819 Fax: 206.839.0824 128 ~ OF -UL Steel lake Crest Plat SSA Acoustics, llP Job #: 07-2201 Page 5 of 14 MEASUREMENT DESCRIPTION SSA Acoustics placed one long-term environmental noise monitor on the property which was a larson Davis 820 (Type 1) Precision Integrating Sound level Meter, which recorded the hourly average sound level. Short-term measurements were also conduded on-site with a larson Davis 824 (Type 1) Spectral Analyzer. The equipment conforms to American National Standards Institute (ANSI) requirements for Type 1 instruments. The Sound level Meters were calibrated before and after the measurements with a 1000 Hz tone at 94 dB.2 The environmental noise monitor was placed on top of a storage shed at 30642 28th Avenue South on Thursday May 17, 2007 to record the long-term noise levels experienced on the property and the monitor was stopped on Tuesday May 22.2007, shown in Figure 1. Figure 1 2 Briiel & Kja!r Type 4230 Sound Level Calibrator (Calbrated by Scantek,lnc. on May 9, 2006) EXH I B IT K PAGE S OF JL. 222 Etruria Street, Suite 100. Seattle. WA 98109 Tel: 206839,0819 Fax: 206,839,0824 129 Steel lake Crest Plat SSA Acoustics, lLP Job #: 07-2201 Page 6 of 14 MEASUREMENT RESULTS The environmental noise monitor recorded an Equivalent A-weighted Noise Level (LEO) for each of the 115 hours the monitor was active. The data was then reduced to a single Day-Night Average Noise Level (Ldn) for each full 24-hour period. The Day-Night Average Noise level (Ldn) corrects for the heightened levels of perception between the hours of 10:00 PM and 7:00 AM with an additional 10 decibel weighting. The recommended exterior day-night noise levelshould not exceed an ldn of 65 dBA; without additional noise reduction incorporated into the construction. 'Figure 2 shows the Equivalent A-Weighted Noise Level (LEO) for each hour from May 17th through May 22nd at 30642 28th Avenue South in Federal Way. Washington. with the Ldn for each full 24-hour period shown3. Fi re2 Outdoor Average Noise Level (LEQ) 70 Ldn=87.1 dBA Ldn" 87... dBA 68 e66 III 'a - j64 . ...J 62 . III "0 Z 60 . 01 I! 58 . ~ :>.56 ;: :I ~ 54 As shown in Figure 2, the Day-Night Average Noise Level (Ldn) ranged from 67 to 69 dB~. The hourly average noise levels exceeded 56 dBA during the entire four day noise monitor, with a maximum 24 hour Leq of 66 dBA and an average leq of 62 dBA. The exterior day-night noise levels exceeded the recommended HUD guidelines. Therefore. mitigation measures will be necessary. 3 Figure 1 is included as a fuH page graph in Appendix 2. EXHIBIT K PAGELOF -1!L 222 Etruria Street, Suite 100, Seattle. WA 98109 Tel: 206.839.0819 Fax: 206.839.0824 130 Steel Lake Crest Plat SSA Acoustics, LlP Job #: 07-2201 Page 7 of 14 RECOMMENDATIONS The measurements at 30642 28th Avenue South in Federal Way, Washington resulted in exterior noise levels ranging between 65 and 70 dBA Ldn. Therefore, noise mitigation will be required to meet the HUD criteria. There are two options to mitigate the noise from Interstate 5 to meet the indoor noise level criteria: either by providing. above-standard exterior envelope construction mitigation or noise barrier mitigation. The following are recommendations for each option to meet the recommentled 45 dBA Day-Night Average Noise Level (Ldn). Exterior Construction MitiQation Standard construction methods that meet current energy code requirements provide a Noise Level Reduction (NLR) of 20 dB, which is adequate for exterior Ldn levels that are 65 dBA or less. Since the exterior Ldn levels are above 65 dBA, additional construction methods are necessary to meet the interior Ldn of 45 dBA. To achieve the 45 dBA Ldn requirement, the exterior envelopes (walls, windows, doors) of the residential units must be constructed to provided a 25 dB Noise Level Reduction (NLR). The general 25 dB Noise Level Reduction construction details are presented in Table 2. The current construction details can be reviewed to incorporate the additional noise level reduction requirements. A 25 dB NLR assumes mechanical ventilation and closed windows year round. EXHIBIT \<. PAGE-1-0F A. 222 Etruria Street. Suite 100. Seattle. WA 98109 TeI206.839.0819 Fax: 206.839.0824 131 Steel Lake Crest Plat SSA Acoustics, llP Table 2 General Job#: 07-2201 Page 8 of 14 25 dB NLR Re uired within 65-70 DLN zones Brick Veneer, Masonry Blocks, or Stucco exterior walls shall be constructed airtight. All 'oints shall be routed or caulked airti hI. At the penetration of exterior walls by pipes, ducts, or conduits, the space between the wall and i es, ducts, or conduits shall be caulked or filled with mortar. Window and/or throu h-the wall ventilation units HVAC should not be used. Throu h-the walVdoor mail boxes shall not be used All sleeping spaces shall be provided with a sound-absorbing ceiling system and carpeted floors. Exterior Walls Exterior walls shall have a laborato sound transmission class rati of at least STC 39. Exterior Windows Exterior Doors Windows shall have a laboral sound transmission class rati of at least STC-28. The total area of glass in both windows and doors in sleeping spaces shall not exceed 20% of the floor area. Doors shall have a laborato sound transmission class ratin of at least STC-28. Roofs Combined roof and ceiling construction shall have a laboratory sound transmission class ratina of at least STC-39. Window and dome skylights shall have a laboratory sound transmission class rating of at least STC-28. Floors Ventilation Openings to any crawl spaces below the floor of the lowest occupied rooms shall not exceed 2% of the floor area of the occu ied rooms. A ventilation system shall be installed that will provide the minimum air circulation and fresh air supply requirements for various uses in occupied rooms without the need to open any windows, doors, or other openings to the exterior. The inlet and discharge openings shall be fitted with sheet metal transfer ducts of at least 20 gauge steel, which shall be lined with 1-inch thick duct lining, and shall be at least 5 feet long with one 90 d ree bend. Grav' vent 0 eni in attics shall not exceed code minimum in number and size. If a fan is used for forced ventilation, the attic inlet and discharge openings shall be fitted with sheet metal transfer ducts of at least 20 gauge steel, which shall be lined with 1-inch thick duct linin ,and shall be at least 5 feet 10 with one 90 d rea bend. Domestic range exhaust ducts connecting the interior space to the outdoors shall contain a baffle plate across the exterior termination which allows proper ventilation. The dimensions of the baffle plate should extend at least one diameter beyond the line of sight into the vet duct. The baffle plate shall be of the same material and thickness as the vent duct material. Fireplaces shall be provided with well fitted dampers as required for the type of fuel being used and ti htl fitted lass doors. EXHIBIT t(.. PAGE-LOF ~ 222 Etruria Street. Suite 100. Seattle. WA 98109 Tel: 206.839.0819 Fax: 206.839.0824 132 Steel Lake Crest Plat SSA Acoustics, LLP Job #: 07-2201 Page 9 of 14 Noise Barrier Mitiaation To provide noise barrier- mitigation to meet both the exterior noise level condition and thus the interior noise condition a noise barrier must be constructed between Interstate 5 and the proposed residences. The goal is to reduce the outdoor noise level by 5 to 7 dB, resulting in a 62 to 64 dBA Ldn, which meets the HUD 65 dBA Ldn Exterior Noise Standard. In tum, the reduction of the outdoor day-night average noise level to 65 dBA or less with normal construction would result in an indoor day-night noise level of 45 dBA or less. The sound attenuation characteristics of a noise barrier are based on the geometry of the barrier relative to the source and receiver locations and the frequency of the source noise. The installation of a highway sound barrier could provide up to 7 dB of reduction from road noise with a 10 feet above road grade noise barrier. The noise barrier should be installed near Interstate 5, as shown in Figure 3. The noise barrier should be constructed from continuously solid material with sound transmission loss requirements: Materials that have a surface mass of at least 3.5 Ibslsq ft will meet these requirements. The following common barrier materials that meet the mass and transmission loss requirements: o 2 layers of 51B-inch exterior grade plywood o 2 layers of 16 gauge sheetmetal EXHIBIT I< PAGE~OF ~ 222 Etruria Street. Suite 100. Seattle. WA 98109 Tel: 206.8390819 Fax: 206839.0824 133 Steel Lake Crest Plat SSA Acoustics, LlP Job #: 07-2201 Page 10 of 14 Figure 3: Noise Barner Location EXHIBIT '\C. PAGE.JILOFJJC 222 Etruria Street. Suite 100. Seattle. WA 98109 TeI206.839.0819 Fax: 206.839.0824 134 Steel Lake Crest Plat SSA Acoustics, LLP Job #: 07-2201 Page 11 of 14 SUMMARY This report has provided the results of the environmental noise survey and mitigation recommendations to reduce the impact of road noise on the proposed residential development. Please contact us if there are any questions. Sincerely, SSA Acoustics, LLP t;:J;11a~ n Erik Miller-Klein SENIOR TECHNICIAN EXHIBIT \(. PAGE-ILOF --U- 222 Etruria Street, Suite 100. Seattle. WA 98109 Tel 206.839.0819 Fax: 206.839.0824 135 Steel Lake Crest Plat SSA Acoustics, LLP Job #: 07-2201 Page 12 of 14 APPENDIX I Federal Interagency Committee on Urban Noise Guidelines for Considerina Noise in Land Use Plannina and Control The United States Federal guidelines for land use compatibility in tenns of noise were released in June 1980, which consolidated the existing guidelines from Federal Agencies such as Department of Housing and Urban Development (HUD), Department of Transportation (DOT) and Environmental Protection Agency (EPA). These guidelines indude a Noise Zone Classification, Table 1 and the Suggested Land Use Compatibility Guidelines, Table 2, based on these noise zones. Table 4: NOISE ZONE CLASSIFICATION ... ....... l'i_ IJIId.I ~~ .-~ 1kID N_ Pil_ E..- ......... A-. ...... --- ......... t_ a... ..... ...... ..... ...... r- - " ........ Hac !IaIlIiIII Nac~ .... ....... Ea...-c " ss >> ..~.. . ModItMe .uo.e SSZ .. .uo.e >> .. MlN 15 lie Ea...-c .... ........ Hac ...... .... e---. ., " . A-. " A"-" ""- )II ... C.I .... ...... .... ....... Mal ....... ~ l'O 70 JS ...........,. - e__ u..........., A.... lit ... A.... lit .. Meooe 15 .. C.J ....~ .... ~ Hac ....... " " . "'--" .. ........ . ... 0- Hac~ Nat~ Hac~ . . ~ s....., "'\1-.....,.... E_ ........ . ... "'"- . .. AMow <U ... 0.2 .... -.... .... ........ ... ....... IS IS so -- 0.) A..... IS "....as .u..e ,.. ICNEL - c-.,.....~ l.-I ~~ _ dle_..... ltwo. DOT ... ErA...... ... - " ... . .............. ....... _ ill ........ die IIUt* IIaIIla .... toft,.. widl _ ...... __ of ..,., (W- IiPA ......... ~.. "--. II .. _......-"..... It ill............ "'.............. _...._ fCIf ~ McI ~ f......., or _.... ....... of.., pettiaoW-*J. l-rk F..... ........, .. ~. '11I"" (FHWAt "'~_lIIiI""" II _......... to L~"" IrIlII ~ ... ,...,.. ...... dIM) .. __ will III '*' fot ......, .. ......... ~ (.... .....) II .......... to ON&. few ...... ...... .... 1M ,.,... 0lNldiIIcIa: II MMy eq"'''' ...- of lOW ttaffIc now . oellidft.... J4 "-so 2) traftic: __ 10 Po" ... ? .... .. _ aaed M.a ...... ", the -....., It'lIf& flow.. .... per J4l1owt. UtIder ..... -.It. DNL ...... LIO - J cIIclIIck. ~~ - lIollitplln am- GIIIr. ~ _... ~ lit DNL. 5nw HUD NoiM ............ .... . ...... _ '" ........, Far... ....lIh lleMfiIs .. _ C-I. "*.--. .....-- ... w ...... fer ...... --...... ...... . Table 1 provides a-letter designation for each noise zone based on the level of noise exposure and the Day-Night Average Sound Level (Ldn). While the HUD Noise Standards, far right column in the Noise Zone Classification table, consider outdoor Day-Night Average Sound Levels below 65 dBA "acceptable-. Note 2 specifies that HUD, DOT and EPA recognize Day-Night Average Sound Level equal to 55 dBA as the goal for outdoors in residential areas in protecting the public health and welfare with an adequate margin of safety. It also notes that this is not a regulatory goal, but a general scientific consensus. EXHIB.IT~ PAGE~OF -1!- 222 Etruria Street. Suite 100. Seattle. WA 98109 Tel: 206839.0819 Fax: 206.839.0824 136 Steel Lake Crest Plat SSA Acoustics, LLP Job #: 07-2201 Page 13 of 14 Table 5: SUGGESTED LAND USE COMPATIBILITY GUIDELINES u.l11. NoIIt z..tIDNL l.eftIt .. .... IUICIt A . C.) c.2 -~~ 0.% D-.J No. N_ 1-55 ~ 65-11 ... B. .. Ih.......... II HOIIICbold units. 11.11 SiaaJe uailt - ddIIdIed Y Y. ul ]01 N N N Il.Il Sinllt uDltl- ~ y Y. ul 30- N N N 11.11 .... uaitI - atUIdIcd row Y Y. Ul JO' N N N 11.1' Two lIIli.s - sick-bJ-lide Y Y. U' 30' N N N II.U Two Units - ODe aIlove dlc otIIa Y Y. U' JO' N N N 11.11 Apin_b - .tlk up . Y Y. H' JO' N N N II.J2 ""*-' - __or y Y. 251 JO' N N N U Oroup quanen Y Y. 1S1 JOl N N N U Resldeatlll boleti Y Y. 1$' JO. N N N 14 Mobile home ....ka or couna Y Y. N N N N N " Tru.sicftlloctainp y Y. Ul ]II lSl N N 16 Other mideatlaI Y Y. 1S1 JOl N N N Table 2 is a guideline for land use with respect to outdoor noise on the property, due to automobile traffic, airplane traffic or other exterior noise sources. The following notes are included in the Guidelines. Notes for Table 2 1. a) Although local conditions may require residential use, it is discouraged in C-1 and strongly discouraged in C-2. The absence of viable altemative development options should be determined and an evaluation indicating that a demonstrated community need for residential use would not be met if development were prohibited in these zones should be conducted prior to approvals. b) Where the community det~rmines that residential uses must be allowed, measures to achieve outdoor to indoor Noise Level Reduction (NLR) of at least 25 dB (Zone C-1) and 30 dB (Zone C- 2) should be incorporated into building codes and be considered in individual approvals. Normal construction can be expected to provide a NLR of 20 dB, thus the reduction requirements are often stated as 5, 10 or 15 dB over standard construction and normally assume mechanical ventilation and closed windows year round. Additional consideration should be given to modifying NLR levels based on peak noise levels. c) NLR criteria will not eliminate outdoor noise problems. However, building location and site planning, design and use of berms and barriers can help mitigate outdoor noise exposure particularly from ground level sources. Measures that reduce noise at a site should be used wherever practical in preference to measures which only protect interior spaces. 2. Measures to achieve NLR of 25 must be incorporated into the design and construction of portions of these buildings where the public is received, office areas, noise sensitive areas or where the normal noise level is low. 3. Measures to achieve NLR of 30 must be incorporated into the design and construction of portions of these buildings where the public is received, office areas, noise sensitive areas or where the normal noise level is low. 4. Measures to achieve NLR of 35 must be incorporated into the design and construction of portions of these buildings where the public is received, office areas, noise sensitive areas or where the normal noise level is low. EXHIBIT 1l PAGE--'3-0F t II 222 Etruria Street. Suite 100, Seattle, WA 98109 Tel: 206.839.0819 Fax: 206.839.0824 137 Steel Lake Crest Plat SSA Acoustics, llP APPENDIX II 7 ~a g v 7~ '00 ~q'b q'b 1!'i:b ~'b 7 ~'b ? ~'b ~qa v q'b 1!''b ~<b ~a v ? ""'i tr'b 3' ~. CD '00 - if q<b 2. 1!''b = - <9. '00 ~a v ? ~a v ~qa v q'b 1!'<b ~<b ~a v 1s>. '00 ~o. '00 q<b 1!''b Hourly Average Noise Level (dBA) Ul N ~ Ul 0) g: 8 ~ ~ lB m Job#: 07-2201 Page 14 of 14 c:f o c a o o "'I ~ CD DJ co CD z o :- r- CD l - r- m o - BIT K PAGE-Ul-OF -Lrr 0- m )> 222 Etruria Street, Suite 100. Seattle, WA 98109 Tel: 206.839.0819 Fax: 206.839.0824 r- Oo ::I II ~ 10 00 lD )> 138 , ,c' .~ Schweikl & Associates, pile Civil Engineering, Project Management, & Consulting TECHNICAL INFORMATION REPORT PRELIMINARY DRAINAGE REVIEW FOR STEEL LAKE CREST PROJECT NO: 06066 JULY 2007, REV. MAY 2008 PREPARED FOR: THE STEEL LAKE PLAT GROUP 30642 28TH AVENUE SOUTH FEDERAL WAY, WASHINGTON 98003 PREPARED BY: BRANT A. SCHWEIKL, P.E. RESUBMITTED MAY :I 6 ZO08 SCHWEIKL AND ASSOCIATES, PLLC.CITYOFFEDERAlWAY BUILDING DEPT. 705 SOUTH 9TH STREET, SUITE 303 TACOMA, WASHINGTON 98405 (253) 272-4451 139 TECHNICAL INFORMATION REPORT PRELIMINARY DRAINAGE REVIEW FOR STEEL LAKE CREST 30642 28th Avenue South Federal Way, Washington 98003 July 2007, Rev May 2008 Prepa(ed for: THE STEEL LAKE PLAT GROUP 30642 28TH A VENUE SOUTH FEDERAL WAY, WASHINGTON 98003 Prepared by: Brant A. Schweikl, P.E. REPORT #06066 "I hereby state that this Storm Drainage Report for Steel Lake Crest has been prepared by me or under my supervision and meets the standard of care and expertise which is usual and customary in this community of professional engineers. I understand that the City of Federal Way does not and will not assume liability for the sufficiency, suitability or performance of drainage facilities prepared by me." This analysis is based on data and records either supplied to, or obtained by, Schweikl and Associates, pllc. These documents are referenced within the text of the analysis. The analysis has been prepared utilizing procedures and applications within the standard accepted practices of the industry. 2140 EXHIBIT L PAGE~OF JW 06066 _REV.PTIR.doc Steel Lake Crest PMcel#'s0921049096, 0921049161,0921049182 & 0921049183 PRELIMINARY STORM DRAINAGE REPORT Project Overview The proposed Steel Lake Crest Plat is located at 30642 28th Avenue South, Federal Way, Washington. The site falls between 28th Avenue South, on the west, and the Interstate 5 right-of-way to the east. Private property bounds the site on the north and south. Except for the northeast comer, which is clipped diagonally by Military Road South, the overall shape of the site is rectangulM. That portion of the property truncated by Military Road being approximately 100 feet longer east to west than north to south. Steel Lake lies directly to the west, and a small portion of the site (the extreme northwest comer) is within 200 feet of the lakes shoreline. The project has requested an exemption from the Shoreline Substantial Development Permit (required when a project is less than 200 feet from a regulated lakes shoreline) based on the fact that the affected area is so minimal it falls below the threshold. Approximately one quarter mile due east of the site, across the Interstate 5 right-of-way, is Dolloff Lake. The location of these two lakes is relevant to the project because ultimately they receive the storm drainage from the site. The project consists of four existing PMcels (parcel #'s 0921049096, 0921049161, 0921049182 & 0921049183) which total approximately 6.77 acres. The four PMCels are owned by three individual parties who currently live in existing homes on the site. These homes, the only existing residences found on the site, all front off of 28th A venue South. The project proposes dividing the four existing parcels into 28 new lots meeting the current RS-7.2 Single Family Residential zoning code, and five tracts. All lots will have a minimum size of at least 7200 squMe feet, and front off of a new internal loop road. The internal road will be built to the City of Federal Way's Section "W" local road standard, with a 52-foot right-of-way, and provide access for all 28 lots onto 28th Avenue South. The three existing homes will be removed and new wood framed single-family structures will be erected on all lots. . All utility services to the new single family residences will be placed underground and be provided from the internal roads right-of- way. Besides the previously mentioned new intemalloop road, the proposed project site infrastructure development includes half street frontage improvements to 28th A venue South. The city is planning 28th A venue South as a minor arterial with a Type "K" cross section. The minimum section width of a Type "K" cross section requires a 78-foot right-of-way. To meet the half street improvements, in addition to installing new curb, sidewalk, planter strip, etc., the project will dedicate an additional 9 feet of right-of-way to the city. The project will add off-site tapers to transition the wider half street "K" section back to the existing street section at both north and south end. The City of E~'i:. l .PA . - OF JOO 3 141 Federal Way also requires 10-foot wide Type III landscape buffers be created between developments and arterials. The project proposes providing tracts along the Military Road and 28th A venue frontages for them. . The site naturally slopes from the southwest comer to the northeast comer. There is an approximate drop of 70 feet across the site, with an average slope of9.3%. There are a few small areas where the average slope exceeds 40%. The majority of these steep slope areas are not naturally occurring, but are the result of man made fills in the backyards of the existing homes. The areas around these existing homes are typically landscaped, with lawns and flower beds, and maintained by the home owners. Away from the landscaped yards, the site is mostly non-maintained native vegetation. The site is wooded with many large fir trees. Generally speaking, the further east you go the heavier and denser the underbrush becomes. The conceptual grading plan as depicted has 17,821 cubic yards of cut and 17,404 cubic yards of fill, after an initial stripping volume of 5,152 cubic yards has been removed. The project is therefore determined to be a Cut site, and must have material exported to an offsite location. The final grading plan will attempt to provide an earthwork balance between the cut and fill amounts, and reuse portions of the existing topsoil in non- structural onsite fill locations to reduce the amount of material needed to be transported off the site. In light of maximizing the number of lots that can be created under the RS-7.2 Single Family Residential Zoning Code, most of the trees within the developed area will be removed to allow for placement of the structures. A Tree Inventory Plan has been created to identify the significant tree population, and the levels to which removal or retention will occur. In conjunction with the Tree Inventory Plan, the project has. obtained the services of a licensed landscape architect to prepare a Landscape Plan to meet the City of Federal Ways requirements in this matter. All efforts will be taken to save any other existing trees or landscape features within the project boundary area that do not directly affect construction of the proposed new residences. The 1998 King County Surface Water Design Manual (KCSWDM), with addendum, is the storm drainage regulatory manual adopted by the City of Federal Way. In accordance with the 1998 KCSWDM, Figure 1.1.2.A, Flow Chart for Determining Tvpe of Drainage Review Required, was utilized to determine the type of drainage review that the project is subject to. That result determined the type of storm drainage review needed is a Full Drainage Review. Per Table 1.1.2.A of the KCSWDM, Requirements Applied Under Each Drainage Review Tvpe, Full Drainage Review, Technical Information Reports, shall address Core Requirement #'s 1-8 and Special Requirement #'s 1-5. The project is located within a Levell flow control area that also requires Basic Water Quality treatment. A separate Detention/Wetpond tract will be created which will contain the proposed combined detention/water quality facility. Preliminary sizing data for the combined facility is included in this report. 4142 EXHIBIT L PAGE--Y::-OF .Jml. 06066 _REV -PTIR.doc Onsite Basin The prominent hydrology feature of this project is that the site lies in two different drainage basins. The portion of 28th Avenue South 'which fronts the project site is essentially the dividing line between the Lower Puget Sound Basin and the Mill Creek Basin. Currently flows from the roadside ditch on the eastern edge of 28th A venue South, enter into a culvert at the northwest comer of the project site, where it gets conveyed eventually to Steel Lake. Steel Lake is in the Lower Puget Sound Drainage Basin and is part of the Central Puget Sound Watershed. Per a May 29,2008 E-Mail from Kevin Peterson, City of Federal Way the Steel Lake Basin will not require any stormwater flow control due to the fact that the developed flows are much less than 0.1 cfs. The basin area subject to vehicular traffic (PGIS) is below the 1998 KCSWDM threshold level of 5000sf and therefore water quality treatment has not been required. Because the topography of the site slopes northeasterly, away from 28th Avenue South, any storm water from the site which does not get into the roadside ditch will naturally flow northeast, away from Steel Lake. This is the majority of the stonn water drainage from the site. The natural point of discharge for this storm water is along the northeast boundary line. This runoff will eventually make its way to Dolloff Lake. Dolloff Lake is part of the Mill Creek Drainage Basin and Duwamish-Green River Watershed. The project lies within the Duwamish-Green River King County Water Resource Inventory Area (WRIA) Code Number 9. According to the King County Districts and DevelopmentConditions Report, there are no mapped hazards (Coal Mine, Erosion, Landslide or Seismic) at the site, and the site is not located in a Critical Aquifer Recharge Area. Wetland Inventory The 1990 King County Wetland Survey was accessed to determine the location and classification of potential wetlands in the vicinity of the project. No wetlands were found to be present on the site. There is an existing wetland east of the Interstate 5 right-of- way, associated with Dolloff Lake, that's approximately one-quarter of a mile from the site. There are no other mapped wetlands in the vicinity of the project. King County Soils Survey The King County Soils Survey Maps provided by the United States Department of Agriculture Soil Conservation Service were reviewed to determine the soil characteristics within the project basin with respect to the soils susceptibility to landslides and erosion and its capability for groundwater recharge and surface water runoff. Upon their review, the maps indicate the soils in the project area are Alderwood type soils. Typical Alderwood soils are moderately well drained, undulating to hilly soils that have dense, very slowly penneable glacial till at a depth of 20 to 40 inches. 5143 EXHIBIT L PAGE' ~ OF--bL 06066_REV-PTIR.doc Jason Engineering & Consulting Business, Inc., a geotechnical engineering firm, has been retained to perform soil testing on the site. Their report titled Subsurface Exploration and Geotechnical Engineering Report, is dated June 20, 2007 (Appendix A.) The report classifies the western half of the project as Alderwood (AgB) soils and the eastern half of the project as Alderwood (AgC) soils. See the Geotechnical report for additional geotechnical information. Federal Emergency Management Agency (FEMA) FloodplainIFloodway Maps FEMA Floodplain/Floodway Maps were reviewed and there were no identified 100 year or 500 year floodplains on the project site. Core and Special Requirements Analvsis Core Requirement #1 - Discharge at the Natural Location There are two natural discharge points for this site due to the fact that the site falls in two separate drainage basins. For the majority of the site, the northeast corner property boundary with the Military Road right-of-way is the natural discharge location. Topographically this is the lowest part of the project site. Storm water runoff would naturally sheet off the site to the northeast towards Military Road. The proposed combined detention and wetpond facility, which will be located in a separate tract in the northeast corner of the site, will discharge to this same location. This complies with the KCSWDM's requirement for discharging at the sites natural location. The discharge from the facility will either be daylighted to the grassy area along the Military Road right-of-way, or tightlined to the existing concrete culvert on adjacent WSDOT right-of- way which drains that area. Currently we are waiting to hear back from WSDOT as to their say in this matter. The remainder of the site, anything which is west of or drains into the eastern roadside ditch along 28th A venue South, discharges from the site via an existing 12 inch concrete culvert. The existing culvert, located in the ditch at the northwest comer of the site, conveys runoff to a catch basin, across 28th Avenue South and away from the site. The runoff will remain tightlined until discharged to Steel Lake. With the required street improverpents, including an additional 9 feet of dedication, the runoff from the developed site essentially is split between the offsite flows going to one basin (Steel Lake), and the onsite flows going to another (Dolloff Lake). The project proposes collecting the offsite runoff in a catch basin at the northwest corner of the site, treating it with a catch basin type filter system, and conveying it to the same existing catch basin that the flow goes to now. In both cases, discharge from the site remains at or near the predeveloped location. Core Requirement #2 - Offsite Analysis A Level 1 downstream analysis was prepared for this project. The summary from this report indicates that the established downstream routes of both basins dEXHIB iif L. PAGE~OF ..I.Ol1. 6 144 06066_ REV -PTIR.doc of erosion or flooding. The analysis concludes that the increased net volumes of storm water runoff generated by development of the project site would not adversely impact the downstream corridor or its adjacent properties, when the runoff is discharged in accordance with the KCSWDM. A full copy of the downstream analysis is included in this report. See Appendix B. Core Requirement #3 - Flow Control The written conclusions from the Pre-application meeting conducted at the City of Federal Way indicate that Levell flow control will be required for the plat of Steel Lake Crest. Also, that the designed facility is to meet the performance criteria outlined in the 1998 King County Surface Water Design Manual with the City of Federal Way Addendum. Due to the nature of the project site, having the offsite area falling into one drainage basin and the onsite area lying in another, the conceptual storm drainage plan addresses the runoff within each drainage basin separately. For the projects onsite area (within the Mill Creek drainage basin) all of the storm water runoff will be collected and conveyed to an open pond facility located at the northeast comer of the site. The controlled discharge from the detention pond will be to the Military Road/Interstate 5 right-of-way, directly east of the proposed pond. This is the natural discharge location for the site. The state department of transportation (WSDOT) has been notified, and the final pond discharge design will depend upon what their permit allows. The preliminary detention volume calculations for the developed site, needed for sizing the pond, were determined by utilizing KCRTS hydrologic modeling software. KCRTS is the hydrologic modeling system employed by the 1998 KCSWDM, which is required to be used by the City of Federal Way. The total area of the onsite basin (after dedication) is 6.67 acres. The projects existing (predeveloped) onsite drainage basin land covering consists of 0.54 acres of impervious surface, 0.19 acres of till grass (lawn) and 5.94 acres of till forest. The projects proposed (developed) land coverings are 3.55 acres of impervious surfaces and 3.12 acres of till grass. Printouts from the KCRTS model showing the developed and predeveloped surface data inputs are found in Appendix G. Sheet B-1, found in Appendix F, depicts the on-site basin boundaries for both the predeveloped and developed conditions. Using the basin information, the program generated the peak annual flow rates for the 100,50,25, 10,5,3,2, 1.3, & 1.1 year storm events. Printouts of this data are also included in Appendix G. Matching the 2 and 10 year peak flow rates', required for Level 1 flow control, and assuming a live storage depth of 5 feet, the model calculated the storage volume needed for the pond to be 34,609 cubic feet. Also calculated were the orifice sizes and their placement height relative to the pond bottom. The sizing data as well as a pond routing chart and a flow frequency graph can be found in Appendix G. The storm water detention tract shown on the preliminary site plan provides ample area for the pond, as the initial design incorporated a pond volume of approximately 45,000 cubic feet. The project proposes that the offsite drainage, which currently discharges to Steel Lake (Lower Puget Sound drainage basin), will continue to discharge to this location. Required road improvements to 28th Ave S. would add an additional 2,800 square feet of 7145 EXHIBIT l PAQ&U~~-pIR.~F --LOl. impervious surface area to the basin due to street widening. This is well below the 1998 KCSWDM minimum 5,000 square foot threshold requiring flow control. However, when you add in the impervious surface area from the City of Federal Way's required 8 foot wide sidewalk, the total impervious area becomes 5,600 square feet. Portions of this sidewalk would essentially expand the area of the existing off site basin, with the back-of- sidewalk becoming the boundary line between basins. Sheets B-2 and B-3, found in Appendix F show the basin for both the predeveloped and developed conditions. The project would then be required to provide flow control for the offsite developed basin because it is 600 square feet over the threshold limit. When considering the 6 foot wide planter strip between the sidewalk and curb, an argument can be made that some amount of runoff from the sidewalk will naturally infiltrate itself before reaching the gutter line. Effectively reducing runoff flows and some of the total impervious area associated with them. Because of this reasoning, and the limited space and topographic constraints of providing a facility in this area, the project will not be required to install any flow control for the offsite basin per City of Federal Way E-mail May 29,2008. Also the project proposes that the lake itself will act as a flow control device given the insignificant amount of additional runoff generated by the road improvements on 28th A venue South compared to the overall volume/surface area of the lake. The flows will produce a minute immeasurable stage increase for the lake on the order of less than 1110,000 of a foot due in part to the large total acreage of Steel Lake. Steel Lake also has a free flowing outlet therefore the natural attenuation of the lake will dampen any potential affects from the small increase in impervious surface area due to the required road improvements. There should be no flooding or erosional affects as a result of accommodating this surface area change within the existing Steel Lake contributing basin. Core Requirement #4 - Conveyance System Four or six inch PVC roof drain pipe at a minimum of .5% slope is a standard building practice that would provide the proposed residential structures more than adequate conveyance of storm water from their downspouts to the proposed storm drainage system. A portion of that system (that serving lots 1-6) will discharge directly to the proposed detention/wet pond. The remainder of which will flow into the drainage collection system located along the internal "Road A". This system is comprised of a series of Type 1 catch basins tied together with 12 inch diameter storm drainage conveyance pipe. The system is designed to drain to a Type 2 catch basin located at a low point between Lots 6 and 28. From here, the collected flow is conveyed via a 12 inch diameter pipe into the detention/wet pond. At minimum slope (0.5%), 12 inch diameter concrete culvert has a maximum flow rate of2.53 cfs. The 12 inch diameter LCPE pipe proposed for use on this project would have an even higher maximum flow rate do to its smoother internal lining. The maximum flow rate calculated by KCRTS for . a 25 year storm event over the developed basin is 1.37 cfs. Therefore, the proposed 12 inch diameter conveyance pipe will be more than sufficient to handle the required design flows. 8146 EXHIBIT " PAGE~OF -'DO... 06066_REV-PTIR.doc A storm drainage line will also be installed as part of the required 28th A venue South street improvements. A 12 inch diameter LCPE storm drainage pipe will connect the existing ditch along 28th A venue at the south property line, with a series of Type 1 catch basins located in the gutter line of the new concrete vertical curb. The north end of the 12 inch diameter LCPE drainage line will connect to an existing 12 inch concrete culvert that conveys the flow northwest under 28th Avenue to an existing catch basin. From here, runoff is conveyed via the existing tightlined storm water system till it is discharged into Steel Lake. Once again a 12 inch diameter pipe is more than sufficient to handle the required design flows. Core Requirement #5 - Erosion & Sediment Control The project engineering documents include a Temporary Erosion and Sedimentation Control Plan, Sheet C-2. The plans call for the installation of a silt fence, catch basin sediment protection, a rock construction entrance, a sediment pond and hydro-seeding protection for the disturbed areas of the project. The ESC facilities within the plan are to be designed and operated in accordance with Appendix D of the KCSWDM. The plan also shows the proposed limits of construction, corresponding to the limits of the potential surface disturbance for the project, and provides a Construction Sequence which conforms to the KCSWDM. The project area also exceeds the minimum threshold for requiring a NPDES permit from the Washington State Department of Ecology. A copy of the TESC plan will be served with the application for the permit prior to construction. No additional measures, with regard to the NPDES permit, are proposed at this time. Core Requirement #6 - Maintenance and Operations All storm water facilities must be maintained and operated per King County standards. A listing of the applicable standards is included in this report. See Appendix C. Core Requirement #7 - Financial Guarantees and Liability The City of Federal Way requires financial guarantees for the installation, proper . operation, and maintenance of all drainage facilities proposed by this project. Once final engineering plans are approved, the city will provide the terms for an Agreemenr & Performance/Maintenance Bond, which the project must secure prior to the beginning of construction. A copy of the city's information sheet with regard to this bond is included in Appendix D. Pursuant to this agreement, the owners of Steel Lake Crest will maintain the drainage facilities per King County standards (see Appendix C) for the required two year period. Core Requirement #8 - Water Quality Per the Preapplication Conference Summary Letter, the project is within a Basic Water Quality Treatment area that is consistent with the KCSWDM. Again the project, which falls within two drainage basins, proposes to address this issue for each basin separately. Appendix F contains maps of two developed basins. For the majority of the storm water, 9 147 EXH!'tT '- PAQJiEV- . doc OF J()() that which drains from the onsite area, the project proposes treatment via a wetpool utilizing particle settlement. The water quality is to be accomplished in a combined (detention/water quality) facility located in a separate tract. The sizing (volume) calculations for the detention portion (live storage) of the facility has already been given under Core Requirement #3 of this report. Sizing (volume) of the water quality portion (dead storage) is as follows: The preliminary water quality volume for the wetpool is calculated using the equation given in Section 6.4.1.1 of the KCSWDM. Wetpool Volume = V = f[(0.9Ai + 0.25Atg + O.IAtf + O.1Ao) x R] Where V = wetpool volume in cubic feet f = volume factor, given as 3 for basic wetpool Ai = area of impervious surface in square feet Atg = area of till soil covered with grass in square feet Au' = area of till soil covered with forest in square feet Ao = area of outwash soil in square feet R = rainfall from mean annual storm event in feet, obtained from Figure 6.4.1.A of the KCSWDM. For the project location a value of 0.039 feet is used. Therefore V = 3 [{(0.9)(l54,532) + (0.25)(1 33,729)} 0.039] V = 20,184 cubic feet The wetpool, dead storage, will be placed under the detention, live storage, volume of the pond and be a minimum of 4 feet deep. For the offsite basin, the required road improvements will not produce sufficient new pollution generating impervious surface PGIS area to exceed the threshold minimum of 5,000 square feet of new (PGIS). The street widening of2Sth Avenue S0uth, the only PGIS created by the project within the offsite developed basin, will amount to approximately 2,800 square feet. The basin therefore is exempt from water quality treatment per the KCSWDM and per the City of Federal Way May 29th, 200S no water quality treatment will be required. Special Requirement #1 - Other Adopted Requirements We have conducted research and found that the project does not appear to lie within a Critical Drainage Area (CDA), Master Drainage Plan (MDP), Basin Plan (BP), Lake Management Plan (LMP), or Shared Facility Drainage Plan (SFDP). Therefore the project will comply with the requirements of the KCSWDM. EXHJ.BIT L. PAGE Ill; OF Jtti. 10148 06066_REV-PTIR.doc Special Requirement #2 - Floodplain/Floodway Delineation The project does not lie within either a 100 year or 500 year floodplain or a floodway per King County I-Map Sensitive Area Ordinance (SAO) maps. Special Requirement #3 - Flood Protection Facilities The project is not protected by levees, revetments, or berms (flood protection facilities) and therefore there are no special design criteria for flood protection for our proposed project. Special Requirement #4 - Source Controls The project is a single-family residential development. Per the KCSWDM it is exempt from source control since the developed use is not qualifying (ie commercial, industrial or multi-family). Therefore, there are not any source control requirements mandated upon the project. Special Requirement #5 - Oil Control This project is a new single-family residential development that does not create any high- use sites. The vehicular turnover rate per building area is below the threshold limit and therefore the project is exempt. Summary In summary, the project proposes to install an open, above ground combined detention and water quality pond to address the Levell Flow Control and Basic Water Quality requirements for the onsite runoff mandated by the City of Federal Way. The pond will be located in a separate tract, located on the northeast corner of the project site. The pond will be designed with the appropriate water quality dead storage to provide Basic Treatment, and sufficient live storage to provide enough volume to allow the discharge to meet Level I flow control. Because the site falls within two s,. jJarate drainage basins, there are two separate discharges from the site, and both must be addressed. We found that the downstreams from each of the projects drainage basins appears to have sufficient ability to convey the larger volumes associated with the designed storm events. The proposed project will provide flow control and therefore not increase the discharge rate to the existing downstream conveyance system. The 1998 King County Surface Water Design Manual, plus addendum, is the City of Federal Way's adopted storm water drainage manual. The project meets the criteria of this manual requiring a Full Drainage Review. The project will be designed with respect to and in accordance with this review and all requirements of the 1998 KCSWDM. EXHIBIT L PAGE-U-OF 1bO... II 149 06066_REV-PTIRdoc APPENDICES Subsurface Exploration and Geotechnical Engineering Report Preliminary Level One Downstream Drainage Facilities Maintenance Standards Information Sheet Vicinity Map Basin Map Flow Control & Water Quality Calculations Appendix-A Appendix-B Appendix-C Appendix-D Appendix-E Appendix-F Appendix-G EXHIBIT /., PAGE-U-OF l/JL 150 APPENDIX A SUBSURFACE EXPLORATION AND GEOTECHNICAL ENGINEERING REPORT EXHIBIT L PAGE.J:!-OF l1b- 151 June 20, 2007 SUBSURFACE EXPLORATION AND GEOTECHNICAL ENGINEERING REPORT Steel Lake Crest 30642 28th Ave South Federal Way WA Parcels# 0921049182,0921049096 0921049183,0921049161 Prepared for Linda Elder 30642 28th Ave South Federal Way W A 98003 EXHIBIT L PAGE J!Lo F ~OO ~ 152 .. << &rBl G'L3J Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Mrs. Linda Elder 30642 28th Ave South Federal Way W A Attn: Mrs. Linda Elder: Re: Subsurface Exploration/Geotechnical Engineering Report, Parcell's: 0921049182, 09210490%,0921049183 &: 0921049161 At your request, we have conducted a soils exploration and foundation evaluation for the above mentioned project The results of this investigation, and our recommendations, are to be found in the following report We have provided three copies for your review and distribution. During our exploration, nine test pits were advanced and soil samples submitted for laboratory testing from the project site. The data has been carefully analyzed to determine soils bearing capacities and footing embedment depths. The results of the exploration and analysis indicate that conventional spread and continuous wall footings appear to be the most suitable type of foundation for the support of the proposed structures. Some variability was encountered in comparing the soil profiles of the site. The onsite slopes appear to be manmade in parts and should be observed by a geotechnical engineer prior to concrete placement for foundation Net allowable soil pressures, embedment depth, soil parameters, and total expected settlements have been presented for the site, later in the report Often, because of design and construction details that occur on a project, questions arise concerning soil conditions. We would be pleased to continue our role as geotechnical engineers during the project We appreciate this opportunity to be of service to you and we look forward to working with you in the future. IT you have any questions concerning this report, the procedures used, or if we can be of any further assistance please call us at (206) '78&.8645. r-" ,"' . .,.';::'- ......:..-.. - /:"':'::"'::"-(. ~. Jason E.C. Bell, P.E. P-resident ,. [EX~IRf.S 09i0312007 ] PO Box 181 Auburn W A. 9807l Page 2 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Entail: Jason@jasonengineXH BIT L PAGEJ ~ Of!aL 153 J!!j Jason Engineering &: Consulting Bus-iness, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Table of Contents Table of Contents Investigation Information Introduction: Scope: General: Site Exploration Procedures General Notes: Drilling &: Sampling Procedures: Laboratory Testing Program: Site lnformation Project Description Climate of Area: Geology of Area: (AgB) Alderwood Gravelly sandy loam Description of Foundation Materials: Geoseismic Setting: Liquefaction Potential: Foundation Discussion & Recommendations General Notes: Foundation Design Recommendations: Lateral Earth Pressures: Structural Fill: Slope Impact Analysis: Groundwater Control: Construction Considerations Earthwork: Excavations: Floor Slab-On-Grade: Erosion Control (typical of most sites) Pavement Design Recommendations Existing Subgrade: Crushed Surfacing: Asphalt Concrete Pavement Conclusion Appendix l: Test Pit Logs Appendix ll; Additional Site Photos Appendix 1Il: Figures Vicinity Map SCS Soil Survey Information Site Plan Appendix IV: Pavement Design 3 4 4 4 4 5 5 5 5 6 6 6 6 6 7 8 9 9 9 10 10 11 11 12 12 12 12 13 14 14 14 14 14 15 20 21 21 21 22 23 PO Box 181 Auburn W A. 98071 Page 3 of 23 Phone (20617ll6-864S F"", (2531833-7316 Emaili /asoD@jasonengiix1n IT L PAGE...lIL-OF .I!b- 154 JI!lJ Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &: Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Investigation Information Introduction: This report presents the results of a soils exploration and foundation analysis for the proposed new construction located at 30642 28th Ave South in Federal Way. The subsurface exploration and analysis determines the various soil profile components, the engineering characteristics of the foundation materials and provides criteria for the design engineers and architects to prepare or verify the suitability of the foundation design This report was requested by Linda Elder. Written authorization to perform this exploration and analysis was provided by Linda Elder Scope: The scope of this geotechnical report and analysis included; a review of geological maps of the area, review of geologic and related literature, a reconnaissance of the immediate site, subsurface exploration, field and laboratory testing, and an engineering analysis and evaluation of the foundation materials to provide allowable bearing capacity, estimates of settlement, subgrade modulus, lateral earth pressure design values, geotechnical recommendations for site grading including site preparation, subgrade preparation, fill placement criteria, suitability of on-site soils as structural fill, drainage and erosion control measures, as well as an evaluation of landslide and erosion hazards at the site per the King County Critical Areas regulations. We were not requested to provide an Environmental Site Assessment for this property. Any comments concernirig onsite conditions and/or observations, including soil appearances and odors, are provided as general information. Information in this report is not intended to describe, quantify or evaluate any environmental concern or situation. General: The exploration and analysis of the foundation conditions reported herein are considered sufficient in detail and scope to form a reasonable .basis for the foundation design. Any revision in the plans for the proposed structure from those enumerated in this report should be brought to the attention of the soils engineer so that he may determine if changes in the foundation recommendations are required If deviations from the noted subsurface conditions are encountered during construction, they should also be brought to the attention of the soils engineer. The soils engineer warrants that the findings, recommendations, specifications, or professional advice contained herein, have been promulgated after being prepared according to generally accepted professional engineering practice in the fields of foundation engineering, soil mechanics and engineering geology. No other warranties are implied or expressed. This investigative report has been prepared for the exdusive use of Linda Elder and retained design consultants thereof. Findings and recommendations within this report are for specific application to the proposed project All recommendations are in accordance with generally accepted soils and foundation engineering practices. PO Box 181 Auburn W A. 98071 Page 4 of 23 PM"", (206) 7ll<Hl645 F... (253) 833-7316 E....n, J~=@j"EXH BIT L. PAGE-O-OF .lIiL 155 ~ Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Site Exploration Procedures General Notes: The field exploration to determine the engineering characteristics of the foundation materials included a reconnaissance of the project site, excavating the test pits, performing field penetrometer and vane shear tests and recovering disturbed grab samples. A total of nine test pits were placed on the site. Test pits were advanced to 10 feet below the existing ground surface. Test pits were located by the field crew near as possible to the proposed building location Schweikl and Associates supplied a site plan to locate the proposed building orientation and position the excavations. The test pits were located by the field technician by means of normal taping and pacing procedures and are presumed to be accurate to within a few feet. After completion, the pits were backfilled with excavated soils and the site cleaned and leveled as required. The types of foundation materials encountered in the test pits have been visually classified and described in detail on the logs provided in the Appendix. The results of the field penetrometer and vane shear tests, moisture contents and other laboratory tests are presented on the logs. It is recommended that the logs not to be used for estimating quantities due to highly interpretive results. Drilling & Sampling Procedures: The test pits were performed with a conventional track excavator. Representative samples were obtained from the pits at various soil intervals. The samples obtained by this procedure were classified in the field by a soils technician, identified according to pit number and depth, placed \n plastic bags to protect against moisture loss and transported to the laboratory for additional testing. Laboratory Testing Program: Along with the field investigation, a supplemental laboratory testing program was conducted to determine additional pertinent engineering characteristics of the,foundation materials necessary in analyzing the behavior of the proposed building structure. The laboratory testing program included supplementary visual classification and water content determinations on all samples. In addition, selected samples were subjected to Moisture Content Analysis - D4959, and Grain Size Analysis - ASlM designation C-117, C-136. All phases of the laboratory testing program were conducted according to applicable ASlM Specifications and the results of these tests are to be found on the accompanying logs located in the Appendix. PO Box 181 Auburn W A. 98071. Page 5 of 23 Phon", (206)786-B64S F"", (253) 833-7316 Emalli '3Son@j3S0neng;"""'EXH BIT L PAGE-1.l-0F .ill> 156 J3J Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design & Analysis Date: 6-2(}.2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 0700l-035 Site Information Project Description The purpose of this section is to enumerate details of the proposed structure. The following information was provided by the project engineer. The buildings will be a wood framed, single family residence structures. Daylight basements may be required in sloped areas. Conventional spread footings and slab-on-grade floors are contemplated. Differential settlements are limited to % inch. A pavement section ~ not been requested but has been provided within this report The site of the proposed building addition upon which this soils exploration has been made is located at 30642 28th Ave South in Federal Way. The site topography consists of a slope on the West side of the lots that drops toward the east The total vertical elevation difference is approximately 55 feet over the entire site. The slopes are located in the middle of the site and runs from NW to SE comers. The site drainage consists of surface runoff an4 natural seepage. The site vegetation is mostly deciduous trees with a few evergreens located on the east side of the lot Blackberry bushes, neddles, vine maples and Cedar trees are also present Prior grading has occurred on the east side of the lot near the existing houses. Climate of Area: The climate of the site and surrounding area as taken from the USDA Soil Conservation Service Survey consists of annual precipitation of 35 to 60 inches, most of which is rainfan. between October and May. The mean annual temperature is about 50 degrees F. The frost free season is 150 to 200 days. Geology of Area: (AgB) Alderwood Gravelly sandy loam The geology of the western portion of the site as taken from the USDA Soil Conservation Service Survey consists of Alderwood gravelly sandy loam (AgB). Typical Alderwood soils are moderately well drained, undulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands and terraces formed under conifers in glacial deposits. This soil is nearly level and undulating, and moderately well drained. Water moves across the substratum in winter. These soils have a slowly permeable glacial till or glacial lake deposits at a depth of 16 to 40 inches and somewhat excessively drained, rolling, deep sandy soils on uplands and terraces. The horizon 0 to 6 inches in depth is usually dark brown. 1he soil horizon from 6 to 12 inches is dark brown, grayish brown and dark yellowish brown. The horizon 12 to 40 inches is consolidated and mostly grayish brown mottled with yellowish brown. Some layers in this horizon slake in water. There is a consolidated substratum of till at a depth of 24 to 40 inches. Soils above the substratum are pervious when compacted. The surface layer is 2 to 3 inches thicker than the nearby soils to the south. Areas are irregular in shape and slopes range from 0 to 6 percent. Runoff 15 slow and the erosion hazard is slight. The geology of the eastern portion of the site consists of Alderwood gravelly sandy loam (AgC). Typical Alderwood soils are moderately well drained, undulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands and terraces formed under conifers in glacial deposits. Soil profiles are similar in type except permeability is moderately rapid in the surface layer and subsoil. However, it is very slow within the cemented layer and dense glacial till. A perched water table is as high as 18 to 36 inches at times from January through March. Runoff is slow to medium and erosion hazard is moderate. Description of Foundation Materials: The soil profiles encountered were relatively consistent among most of the pits. It is to be noted that, whereas the test pits were placed and sampled by an experienced techni~ it is sometimes difficult to record changes in stratification within narrow limits. In the absence of foreign substances, it is also difficult to distinguish between PO Box 181 Auburn W A. 98071 Page 6 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email:Jason@jasonenginixH BIT . ~ PAGE.1!-OF .JJ:IL. 157 J!!j""" "" Jason " " >', Engineering &: Consulting I Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 discolored soils and clean soil fills. It is recommended that the logs not to be used for estimating quantities due to highly interpretive results. The surface of the proposed construction site is covered with 6 to 12 inches of topsoil that should be removed prior to the start of any construction due to the high compressibility of these soils. Silty sand with gravel was encountered beneath the existing topsoil and extended to depths beyond the scope of this investigation tines of demarcation represent the approximate boundary between the soil types, but the transition may be gradual. The top few feet consisted of a brown,. silty sand with gravel, medium dense to dense. Below this was a gray to gray- brown gravel with sand and sill This layer was dense to very dense. The layers were fairly consistent with the depths varying between sample pits. In the area of sample pit #6, there was miscellaneous debris, fill, used tires and wood. No trash debris was found in the other sample pits. The total area and quantity of trash found in this area is uncertain and should be carefully observed during excavation to ensure all trash is removed. Geoseismic Setting: Foundation soils on this site are designated a Site Class C, from Table 1615.1.1 per the 2003 International Building Code (IB.C.). All building structures on this project should be designed per the Code Requirements for such a seismic classification These types of soils have a shear wave velocity in the range of 1,200 to 2,500 ft/ see. The undrained shear strength is typically greater than 2000 psf with blow counts greater than 50 blows per fool The following may be used for the seismic coefficients. Sile class C III D '3 " J c. ~ "" ~ ~ .s Jr- (/] ~ \ S 28RTH ST EX.)LA-'ATIO-' ,. U D o o o o [] Sile class F Req.ure. cite-.;pe"i rlC iOlieiligallOll Site class E Site class D III E ~ ~ ." " " 2 .., UJ :> <r.: ;r :::: ..... Site da.,s D S J~()TH ST Site class C j. Sito: dass B III C ( S il" cia." B 1 ./ PO Box 181 Aubum WA. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Entail: Jason@jasonengineer.com EXHI IT L PAGE10F 1tQ.. Page 7 of 23 158 1m cvUJ Jason Engineering &: Consulting Business, Ine. Geotec:hnical Engineering Retaining Structures Projec:t Management/Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: (J7()()1-035 Design Response Spectrum C R f ) I.. i II: I ,. 120.00 \ \ "-.... -......... r--. f-- 100.00 80.00 60.00 40.00 20.00 0.00 0.00 0.20 0.40 0.60 0.80 PerIod, T 1.00 1.20 1.40 Period, T Sa Sels Sms 0 0.00 40.0 To 0.05 . 100.0 100 150 Ts 0.26 100.0 100 150 1 1.00 26.0 2 200 13.0 . Sds and Sms values given at max acceleration Sm1 = 39, Sd1 = 26 . Liquefaction Potential: Liquefaction is when saturated, cohesionless soils are temporarily turned in to a liquid state usually from a seismic event If ground motion lasts for extended amounts of time, the grain to grain contact shifts and the grain structure can collapse. If the water within the soil cannot flow easily between the grain and out of a collapsing area, the water pressure increases. When pore pressures build up within the soil and exceed the effective contact pressure of the soil, the water can push the soil particles apart When the particles lose contact with each other, the soil mass can behave like a liquid. If pore pressures are great enough, water may discharge out of the ground like a geyser leaving characteristic signs, such as sand boils. Liquefaction is generally related to; soil characteristics, water table depths and the degree of seismic activity. The results are lower bearing capacities, increased settlement issues, landslides, and lateral spreading to name a f~ things. Liquefaction potential for this site is provided within the boundaries of the site. Seismic events which affect land masses on a greater scale are beyond the scope of this report In our review we found no evidence of liquefaction of the soils in the immediate area from the 1949, 1965 and 200l earthquakes. The site is located within the category III region of the Poverty Bay Auburn quadrangle liquefaction susceptibility map (GM-43) which has a VERY LOW susceptibility rating for liquefaction It includes all other Pleistocene glacial and non-glacial deposits and the Osceola Mudflow. Additional information on the site has been reviewed on Liquefaction Susceptibility Map provided by the Department of Natural Resources which rates the site as having a VERY LOW susceptibility to liquefaction EXPLANATION 1':::1 Liqudadion susceptibility: HIGH D Liqucfaction suscc'Ptibility: MODERATE to HIGH D Liqucfac1ion susceplibilily: MODERATE D Li'lucfilclinn sus.."c(llihilily: LOW tn MOUE RATE D Li'lucfaction susccl'tibility: LOW 1/)\1 Liqucfaction susccl'tibiJity: VERY LOW 10 lOW ,.... <;t Liqucfaction susceptibility: VERY lOW PO Box 181 Auburn W A. 98071. Page 8 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Em.ail:Jason@jasonenginEXHI IT L PAGE--1L.OF .J.tll. 159 J5j Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design & Analysis Date: 6-20-2007 Project Steel Lake Crest,. 30642 28th Ave South, Federal Way File #: 07001-035 Foundation Discussion & Recommendations General Notes: Various foundation types have been considered for the support of the proposed building structure. Two requirements must be fulfilled in the design of foundations. First, the load must be less than the ultimate bearing capacity of the foundation soils to maintain stability; and secondly, the differential settlement must not exceed an amount that will produce adverse behavior of the superstructure. The allowable settlement is usually exceeded before bearing capacity considerations become important; thus, the allowable bearing pressure is normally controlled by settlement considerations. Considering the subsurface conditions and the proposed construction, it is recommended that the structure be founded upon conventional spread and continuous wall footing foundations. Settlements should not exceed tolerable limits if the following design and construction recommendations are observed. Foundation Design Recommendations: On the basis of the data obtained from the site and the test results from the various laboratory tests performed, we recommend that the following guidelines be used for the net allowable soils bearing capacity. Ground Surface 18.0 inch min. required for freeze-thaw Footing Depth: 18 inches I g / Bearing Capacity: 2,000 PSF If' All footings are to be excavated to and placed on native undisturbed soils (gray gravel with sand and silt) or compacted structural fill. Footings are required to be a minimum of 18 inches below grade for freeze thaw purposes. After excavation, compact any loose surface soils with a jumping jack compactor. These soils shall be confirmed for bearing capacity and verified by the soils engineer after excavation. It- After excavation, compact the surface with a jumping jack compactor. Confirm compaction of the native soils and that all soft spots have been removed and replaced with suitable fill material and compacted to least 95% of the maximum dry density as determined by ASTM 0-1557. It- Continuous wall footings should be a minimum of 18 inches in width and any slab for the proposed building should be suitably reinforced and connected to the footings so as to limit the effects of differential settlement and to provide some degree of uniform settlement ability for the building should the site undergo liquefaction during a major seismic event PO Box 181 Auburn W A. 98071. Page 9 of 23 Ph.... (206) '/86.&i45 F"", (253) 833-7316 Email: J..on@j"o~HI IT ~ PAGE 1,~ OF ~ 160 J5j Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South. Federal Way File #: 07001--035 It- In the area of sample pit #6, there was miscellaneous debris, fill, used tires and wood. No trash debris was found in the other sample pits. The total area and quantity of trash found in this area is uncertain. Footing excavation should be carefully observed during excavation on the sloped area to ensure all trash is removed and the native soils are found h 1he use of on-sire soils as structural fill is acceptable. If these soils are to be used for structural fill, laboratory samples will need to be taken for grain size analysis and moisture-density relationships.. Structural fill shall be compacted to at least 95% of maximum density per ASTM 01557 in footing areas. The footings should be proportioned to meet the stated bearing capacity and/or the International Building Code 2003 minimum requirements. Total settlement should be limited to 1 inch total with differential settlement of 3f4 inch Any excessively loose or soft spots or areas that do not meet the compaction requirements that are encountered in the footing subgrade will require over-excavation and backfilling with at least 1 foot of structural fill. In order to minimize the effects of any slight differential movement that may occur due to variations in the characters of the supporting soils and any variations in seasonal moisture contents, it is recommended that all continuous footings be suitably reinforced to make them as rigid as possible. It is recommended that the services of our firm be engaged to rest and evaluate the soil conditions during the construction phase of the project 1he design values and recommendations made herein are valid only insomuch as they are followed during the construction phase. Additionally, monitoring and testing during the construction phase needs be performed to verify the subgrade conditions and that suitable materials are used and that they are properly placed and compacted Lateral Earth Pressures: Lateral earth pressures are dependent upon the backfill materials and their configuration and moisture content. Three inch minus sand and gravel mixtures that are free draining are recommended for backfilling walls greater than four feet tall Below grade retaining walls or walls designed for retaining earthen fills on this project may use the following values for design Values were obtained based on a unit weight of 130 pef, and a phi angle of 34 degrees. Earth Pressure Coefficients Active, 1<..: 0.283 At Rest, I<o: 0.441 Passive, Kp: 3.537 Earth Pressure Active: 37 At Rest 57 Passive: 460 Coefficient of Friction: 0.35 Ibs./ft3 lbs. / ft3 lbs. / ft3 Structural Fill: Structural fill should consist of a 3 inch minus select, clean, granular soil with no more than 5% fines (-#200). Suitable structural fill should consist of material that meets one of the following specifications, WSDOT Section 9- 03.10 Aggregate for Gravel Base, WSDOT Section 9-00.14(1) Gravel Borrow, WSDOT Section 9-03.14(2) Select Borrow, WSDOT Section 9-03.9(3) Crushed Surfacing (Base Course Specs), WSDOT Section 9-03.9(3) Crushed Surfacing (Top Course Specs), APW A Qass A Pit Run, or APW A class B Pit Run. Material that does not meet one of the specifications should be submitted with sieve analysis results for approval prior to placement The fill should be placed in lifts not to exceed 12 inches in loose thickness. Each layer of structural fill should be compacted to a minimum density of 95% of the maximum dry density as determined by ASTM designation 0-1557. For structural fill below footings, the area of the compacted backfill must extend outside the perimeter of the foundation for a distance at least equal to the thickness of the fill between the bottom of the foundation and the PO Box 181 Auburn WA. 9807l Page to of 23 Phone: (206) 7~5 Fax: (253) 833-7316 Email: Jason@jasonengineer.com . EXHBIT ~ PAGE ~5~ 161 J!!j' .'" Jason '>< Engineering&: Consulting , Bus_., In<. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South. Federal Way File #: (J7OO1-035 underlying soils. If it is elected to utilize a compacted backfill for the support of foundations, the subgrade preparation and the placing of the backfill should be monitored continuously by a qualified engineer or his representative so that the work is performed according to these recommendations. Slope Impact Analysis: Sample pits placed near the sloped portion of the site appear to less dense in the upper layers those observed at lower areas farther to the east of the site. It is likely the existing slope was modified, especially in the area of test pits #6 and #7 where debris was found. Footing excavation should be carefully observed during excavation on the sloped area to ensure all trash is removed and the native soils are found. Re-grading of the slopes will be necessary to reach native competent soils for a solid foundation. Excavation into the slope may increase the steepness of the existing slope and require houses in this area to be of a daylight basement structure. We do not anticipate that the proposed residential structure and construction of the project will have any off-site impacts. On-site care should be taken during construction to make sure that runoff, caused by wet weather is directed away from all open excavations. The site is stable enough to support the proposed residential construction within the recommendations made herein. lhere were no signs of previous slope instability or failures. Groundwater Control: Groundwater was not encountered when the field exploration was conducted. A seep was noted only in sample pit #1. Groundwater is not expected to cause difficulties during construction of this project It is recommended that runoff caused by wet weather be directed away from all open excavations. The on-site silty soils can be expected to become soft and pump if subjected to excessive traffic after becoming wet during periods of bad weather. This can be avoided by constructing temporary or permanent driveway sections should wet weather be forecast The on-site drainage (roof drains & catch basins for pavement areas) should be collected and directed away from the property. This can be accomplished by tight-lining the drainage to the approved storm drainage system. Retaining walls should contain at least 12 inches of free draining material behind the wall as well as a 6 inch perforated drainpipe at the bottom of the wall to alleviate any pressure buildup. Connect the drainpipe to the on site storm drainage system. PO Box 181 Auburn W A. 98071 Page II of 23 . Phone (206) _5 F"", (253) 833-7316 E...n, J..on@j..onen~XH BIT L PAGE-aOFmL 162 J5j..' :.."...... . "'. / I Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave Soulb, Federal Way File #: 07001-035 Construction Considerations Earthwork: Excessively organic top soils generally undergo high volume changes when subjected to loads. This is detrimental to the behavior of pavements, floor slabs, structural fills and foundations placed upon them. It is recommended that excessively organic top soils be stripped from these areas to depths of 6-12 inches and wasted or stockpiled for later use. Exact dep'ths of stripping should be adjusted in the field to assure that the entire root zone is removed. It is recommended that the final exposed subgrade be inspected by a representative of the soils engineer. This inspection should verify that all organic material has been removed. Any soft spots or deflecting areas should be removed to sound bearing and replaced with structural fill. Once the existing soils are excavated to the design grade, proper control of the subgrade conditions (ie., moisture content) and the placement &: compaction of new fill (if required) should be maintained by a representative of the soils engineer. The recommendations for structural fill presented within this report, can be utilized to minimize the volume changes and differential settlements that are detrimental to the behavior of footings, and floor slabs. Enough density tests should be taken to monitor proper compaction. For structural fill beneath building structures one in-place density test per lift for every 1,000 ft2 is recommended. In parking and driveway areas this can be increased to two tests per lift for every 1,000 ft2. Excavation equipment may disturb the bearing soils and loose pockets can occur at bearing levels that were not disclosed by the test pits. For this reason, it is recommended that the bottoms of the excavations be compacted in- place by vibratory compactors. The upper 12 inches should be recompacted to achieve an in-place density of not less than 95~ of the maximum dry density as determined by ASlM 0-1557. Excavations: Shallow excavations required for construction of foundations that do not exceed four feet in depth may be constructed with side slopes approaching vertical Below this depth it is recommended that slopes not exceed one vertical to one horizontal. For deep excavations, the soils present cannot be expected to remain in position. These materials can be expected to fail. and collapse into any excavation thereby undermining the upper soils materials. This is especially true when working at depths near the water table. Proper care must be taken to protect personnel and equipment Care must be taken so that all excavations made for the foundations are properly backfilled with suitable material compacted according to the procedures outlined in this report Before the backfill is placed, aU water and loose debris should be removed from these excavations. This information is provided for planning purposes. It is our opinion that maintaining safe working conditions is the responsibility of the contractor. Jobsite conditions such as soil moisture content, weather condition, earth movements and equipment type and operation can all affect slope stability. AU excavations should be sloped or braced as required by applicable local, state and federal requirements. Floor Slab-On-Grade: Before the placing of concrete floors or pavements on the site, or before any floor supporting fill is placed, the organic, loose or obviously compressive materials must be removed. The subgrade should then be verified by the geotechnical engineer or his representative that all soft or deflecting areas have been removed. Areas of excessive yielding should be excavated and backfilled with structural fill. PO Box 181 Auburn W A. 98071. Page 12 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengiUFlI IT ~ PAGE~OF ..ICL 163 J3j.. '. Jason . >/, Engineering & Consulting . 'Bus......, In<. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South,. Federal Way File #: O7OOl-035 Any additional fill used to increase the elevation of the floor slab should meet the requirement for structural fill Structural fill should be placed in layers of not more than 12 inches in thickness, at moisture contents at or above optimum, and compacted to a minimum density of 95% of the maximum dry density as determined by ASlM designation 0-1557. A granular mat should be provided below the floor slabs. 1his should be a minimum of four inches in thickness and properly compacted. The mat should consist of sand or a sand and gravel mixture with non-plastic fines. All material should pass a 3/4 inch sieve and contain less than 10% passing the #200 sieve. Groundwater can be expected at shallower depths during the winter months. A moisture barrier, such as visqueen or plastic sheeting, may be placed beneath all floor slabs that are within a foot of the water table~ as determined during excavation. Erosion Control (typical of most sites) 1. The implementation of these ESC plans and the construction, maintenance, replacement, and upgrading of these ESe facilities is the responsibility of the owner IFSC supervisor until all construction is approved. 2. The boundaries of the clearing should be clearly flagged by a continuous length of survey tape (or fencing, if required) prior to construction. During the construction period, no disturbance beyond the clearing limits shall be permitted. The clearing limits shall be maintained by the owner IESC supervisor for the duration of construction. 3. The ESC facilities are to ensure that the transport of sediment to surface waters, drainage systems, and adjacent properties is minimized. 4. The FSC facilities shown on this plan are the minimum requirements for anticipated site conditions. During the construction period, these ESe facilities shall be upgraded as needed for unexpected storm events and modified to account for changing site conditions (e.g., additional sump pumps, relocation of ditches and silt fences, etc.). . 5. The FSC facilities shall be inspected daily by the owner/FSC supervisor and maintained to ensure continued proper functioning. 6. Any areas of exposed soils, including roadway embankments, that will not be disturbed for two days during the wet season or seven days during the dry season shall be immediately stabilized with the approved FSC methods (e.g., seeding, mulching, plastic covering, etc.). 7. The ESC facilities on inactive sites shall be inspected and maintained a minimum of once a month or within forty-eight (48) hours following a storm event 8. At no time shall more than one (1) foot of sediment be allowed to accumulate within a catch basin. All catch basins and conveyance lines shall be cleaned prior to paving. The cleaning operation shall not flush sediment-laden water into the downstream system. 9. Stabilized construction entrances and roads shall be installed at the beginning of construction and maintained for the duration of the project Additional measures, such as wash pads, may be required to ensure that all paved areas are kept clean for the duration of the project 10. Any permanent flow control facility used as a temporary settling basin shall be modified with the necessary erosion control measures and shall provide adequate storage capacity. H the facility is to function ultimately as an infiltration system, the temporary facility must be graded so that the bottom and sides are at least three feet above the final grade of the permanent facility. 11. . Where straw mulch for temporary erosion control is required, it shall be applied at a minimum thickness of 2 to 3 inches. 12. Prior to the beginning of the wet season (Oct 1), all disturbed areas shall be reviewed to identify which ones can be seeded in preparation for the winter rains. Disturbed areas shall be seeded within one week of the beginning of the wet season. PO Box 181 Auburn WA. 9807l Page 13 of 23 Phone (206) 786-8645 F"" (253) 833-73l6 Eman, '..on@j.......ginEXH BIT ..... PAGE-z;&' OF.lJJL 164 ~. .r3J..'..... - " " ....f > I Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design & Analysis Date: 6-20-2007 ~ Steel Lake Crest, 30642 28th Ave South, Federal Way File II: 07001-035 Pavement Design Recommendations On the basis of the results of laboratory tests and the assumed traffic counts of the proposed project, the pavement profile should consist of the following recommendations: Existing Sub grade: 1) All subgrade preparation work to be performed should be monitored by a representative of our firm. 2) Over-excavate any areas that exhibit pumping of the subgrade soils at least 12 inches (or as directed W a representative from our firm). Replace with gravel base material If subgrade is saturated or pumping excessively after over-excavating then it may be necessary to place quarry spalls on the subgrade prior to placement of any gravel base material 3) On the basis of the existing soils type, the onsite conditions, and the anticipated traffic conditions we recommend that the existing subgrade being compacted to 95" of the maximum dry density as determined by ASlM 0-1557 (Modified Proctor). 4) Under certain site conditions the existing subgrade can be accepted by proof-rolling the subgrade using a fully loaded dump l:r'ock. This procedure (if used) should be witnessed and accepted by a representative of our firm. 5) A geotextile fabric (if used) should be placed upon the approved subgrade to maintain the structural integrity of the pavement profile. The fabric should be a type of fabric specifically made for use in road construction Crushed Surfacing: 1) The layer of crushed surfacing material should consist of 6 inches of WSDOT Section 9-03.9(3) Crushed Surfacing (Base Course Specs) that is placed and compacted to 95" of the maximum dry density as determined by ASlM 0-1557 (Modified Proctor). 2) All of the crushed surfacing and Gravel Base material could at the contractor's option consist of WSDOT Section 9-03.9(3). Crushed Surfacing (Top Course Specs) that is placed and compacted to 95" of the maximum dry density as determined by ASlM 0-1557 (Modified Proctor). 3) The material should be placed in lifts not to exceed 6 inches, with each lift being compacted and verified. 4) The crushed surfacing material should be placed to provide the proper grade and drainage for the' asphalt pavement Asphalt Concrete Pavement: 1) The asphalt pavement should consist of at least 3.0 inches of WSDOT Class B asphalt that is placed and compacted to at least 91" of the theoretical maximum density as determined by ASTM 0-2041 (Rice Method). 2) Provide a tack coat on all concrete surfaces that the pavement will be placed against, and for multiple lifts that are not placed within an hour time period. Conclusion All footings a,re to be placed on native undisturbed soils (gray gravel with sand and silt). The existing slope appears to be manmade in locations and should be excavated to native soils foundation placement When the plans and specifications are complete, or if significant changes are made in the character or location of the proposed structures, a consultation should be arranged to review them regarding the prevailing soil conditions. Then, it may be necessary to submit supplementary recommendations. While the recommendations made herein are considered sufficient in detail for the construction of the proposed project, there are many alternative methods of construction which are available. We can discuss various other options for construction at your request PO Box 181 Auburn W A. 9807l Page 14 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengi~ I IT ~ PAGE~OF JDJl 165 '~". ~ Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Appendix I: Test Pit Logs Lo #1 Boring ID: Date of Excavation: Project Name: File #: Depth(ft): Profile (feet) (meters) uses 1 0.30 2 0.61 3 0.91 4 1.22 5 152 6 1.83 7 2.13 CP-GM' 8 2.44 9 274 10 3.05 End Borin SP-1 5-5-2007 Steel Lake Crest 07001-:035 SPT(N) (bIows/ft) Moisture % Lo #2 Boring 10: Date of Excavation: Project Name: File #: SP-2 5-5-2007 Steel Lake Crest 07001-035 Depth(ft): Profile (feet) (meters) uses 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 2.13 GP-GM 8 2.44 9 2.74 10 3.05 End Boring SPT(N) (blows/ ft) Moisture % Percent passing 3/4" #4 1#200 75 52 12 grab gray brown gravel with sand and silt,. dense Peocent passing 3/4" #4 1#200 75 52 Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: . Sample Description Type Track Excavator 455 10 JECB topsoil brown silty sand with gravel, medium dense water seep noted at 4 ft,. slow flow Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Sample Description Type Track Excavator 445 10 JECB topsoil brown silty sand with gravel, medium dense No water visible 12 grab gray gravel with sand and silt.. very dense PO Box 181 Auburn WA. 9807l Page 15 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengiE5riil IT l- PAGE..1LOF -I tA2 166 ~...~.'<<......... . -', . '.'// Jason Engineering &; Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &; Analysis Date: 6-2~2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo~ #3 Boring ID: Date of Excavation: Project Name: File t#: SP-3 5-5-2007 Steel Lake Crest 07001-035 Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 443 10 JECB Depth(ft): Profile (feet) (meters) uses 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Boring Moisture % SPf(N) (blowsl ft) Lo #4 Boring ID: Date of Excavation: Project Name: File #: SP-4 5-5-2007 Steel Lake Crest 07001-035 Depth(ft): (feet) (meters) 1 030 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 EndBo' Profile SPf (N) uses (blows/ft) Moisture % GP-GM Pen:ent passing 3/4" #4 1120O Sample Description Type topsoil brown silty sand with gravel,. medium dense 167 75 52 U grab gray gravel with sand and silt. very dense Track Excavator 440 10 JECB topsoil brown silty sand with gravel,. medium dense 75 52 12 grab gray gravel with sand and siIt. very dense PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonen~}rH I No water visible Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Pen:ent passing 3/4" #4 1120O Sample Description Type No water visible Page 16 of 23 IT t PAGE.2l-0F ~ . (f~ >..... ~ Jason Engineering &: Consulting Business, Ine. Geotechnical Engineering Retaining Structures Project Management! Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo~ #5 Boring ID: Date of Excavation: Project Name: File #: SP-5 5-5-2007 Steel Lake Crest 07001-035 Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 440 10 JECB Profile uses Moisture % Depth(ft): (feet) (metelS) 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 213 8 244 9 274 10 3.05 End Boring SPT (N) (blows/ft) GP.(;),f Lo~ #6 Boring ID: Date of Excavation: Project Name: File I: SP~ 5-5-2007 Steel Lake Crest 07001-035 Percent passing 3/4" #4 11200 Sample Description Type topsoil brown silty sand with gravel. medium dense No water visible 75 52 12 grab gray gravel with sand and silt, very dense Method of Sample: Surface Elevation (ft): Total depth (ft): Technician: Track Excavator 444 12 JECB Profile uses Depth(ft): (feet) (metelS) 1 0.30 2 0.61 3 0.91 4 1.22 5 1.52 6 1.83 7 213 8 244 9 274 10 3.05 11 3.35 12 3.66 GP-GM End Boring SPT (N) Moisture (blows/ft) % Percent passing 3/4" #4 1120O Sample Description Type topsoil Fill material, gravel with sand and silt used tires, wood debris 75 52 12 grab gray gravel with sand and silt, very dense PO Box 181 Auburn WA. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 EmaiI: Jason@jasonengineer.com EXH BIT ~ PAGE~OF I(J) Page 17 of 23 168 . #tfl ....... ~ Jason Engineering &: Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &: Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo #7 Boring ID: Date of Excavation: . Project Name: File #: Depth(ft): (feet) (metelS) 1 0.30 2 0.61 3 0.91 4 122 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Borin Lo~ #8 Boring ID: Date of Excavation: Project Name: File #: SP-7 5-5-2007 Steel Lake Crest 07001-035 Profile uses SPf(N) (bIows/ ft) Moisture % Method of Sample: Surface mevation (ft): Total depth (ft): Technician: Percent passing 3/4" 14 #200 Sample Description Type Track Excavator 446 10 JECB topsoil brown silty sand with gravel. medium dense Percent passing 3/4" 14 #200 Sample Description Type SP-8 5-5-2007 Steel Lake Crest 07001-035 No water visible 75 12 grab gray gravel with sand and silt, dense 52 Method of Sample: Surface mevation (ft): Total depth (ft): Technician: Track Excavator 457 10 JECB Depth(ft): (feet) (meters) 1 0.30 2 0.61 3 0.91 4 122 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End Bo . Profile uses SPf(N) (blows/ft) Moisture % topsoil brown silty sand with gravel. medium dense No water visible 75 52 12 grab gray gravel with sand and silt, dense GP-GM PO Box 181 Auburn W A. 98071 Phone: (206) 786-8645 Fax: (253) 833-7316 Emai!: Jason@jasonengineer.com ~ EXHIIil.IT- b6" PAGEJtLOF I 169 Page 18 of 23 JIJJ Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/ Inspection Pavement Design & Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: 07001-035 Lo #9 Boring ID: Date of Excavation: Project Name: Fde#: Depth(ft): (feet) (meters) 1 0.30 2 0.61 3 0.91 4 122 5 1.52 6 1.83 7 2.13 8 2.44 9 2.74 10 3.05 End 50 . SP-9 5-5-2007 Steel Lake Crest 07001-035 Profile uses SPf(N) (bIows/ ft) Moisture % Method of Sample: Swface Elevation (ft): Total depth (ft): Technician: Percent passing 3/4" #4 #200 Sample Description Type Track Excavator 465 10 JECB topsoil brown silty sand with gravel, medium dense No water visible 75 52 12 grab gray gravel with sand and silt, very dense GP-GM (orange), is consistent same material GP-GM (pink), 75-52-12 is consistent same material Variability between test pits is depth of material encountered. PO Box 181 Auburn WA. 9807l Phone: (206) 786-8645 Fax: (253) 833-7316 Email: Jason@jasonengineer.com EXHI IT~ PAGEAOF .JCL 170 Page 19 of 23 J!!j Jason Engineering &; Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management / Inspection Pavement Design &; Analysis Date: 6-20-2007 ~ Steel Lake Crest,. 30642 28th Ave South, Federal Way File #: 07001-035 Appendix II: Additional Site Photos 1: Test pit with typical very dense, gray gravel with sand and silt. 2: Sample pit #6 with used tires and debris found down to 10 ft. 3: Composite view of site looking north from the south east comer Phone: (206) 786-8645 PO Box 181 Auburn W A 98071 Page 20 of 23 Fa>e (253) 833-7316 Emaih J..on@j,,~XH ~~ _I,. PAGE, OF 1ftJ 171 J5j Jason Engineering & Consulting Business, Inc. Geotechnical Engineering Retaining Structures Project Management/Inspection Pavement Design & Analysis Date: 6-20-2007 Project Steel Lake Crest, 30642 28th Ave South, Federal Way File #: (JJ00l-035 Appendix III: Figures Vicinity Map J ..... , --'" ~ " .. \: .,. .. , ~. . ... 6"'/' \ t . i ,':, I' I -fl - - t .. .i ."," ... i f____... i I { .'1 ~ tnS~B1 .i ~ '-51 s ... 9t"\-~,:,. .. 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Geotechnical Engineering Retaining Structures Project Management I Inspection Pavement Design &; Analysis Date: 6-20-2007 ~ Steel Lake Crest. 30642 28th Ave South, Federal Way File #: 07001-035 Appendix IV: Pavement Design AASfITO Pavement Section Design Project Location: Steel Lake Crest Average Daily Traffic Count: 500 All Lanes &: Both Directions Pavement Design Life: 20 Years % of Traffic in Design Lane: 100% Terminal SeviceabiIity Index (P..): 2.0 1"'1 Level of Reliability: ~ Expected Growth Rate: 2.0% Subgrade CBR Value: 20 Subgrade Mr 30,000 Calculation of Design 18 kip ESALs Daily Traffic Load Design Breakdown Factors ESAL's Passenger Cars: 153 0.0008 1,085 Buses: 3 0.6806 15,090 Panel &: Pickup Trucks: 38 0.0122 4,057 2 Axle, 6 Tire Trucks: 10 0.1890 16,762 Concrete Trucks: 0 4.4800 2,980 Dump Trucks: 20 3.6300 643,856 Tractor Semi Trailer Trucks: 25 2.3719 525,882 Double Trailer Trucks 1 2.3187 20,563 Heavy Tractor Trailer Combo Trucks: 1 2.9760 26,393 Average Daily Traffic in Design Lane: 250 Total Design Life 18 kip ESAL's: Actual Log (ESAL's): Trial Log (ESAL's): Trial SN: 1,256,668 6.099 6.100 2.22 OK Design Depth Structural Drainage Inches Coefficient Coefficient Asphaltic Concrete: 3.00 0.42 nla Asphalt Treated Base: 0.00 0.25 nla Cement Treated Base: 0.00 0.17 nla Crushed Aggregate Base: 6.00 0.14 1.0 Existing Aggregate Subgrade: 2.00 0.11 1.0 Pavement Section Design SN: 2.32 OK PO Box 181 Auburn W A. 98071 Page 23 of 23 Phone: (206) 786-8645 Fax: (253) 833-7316 Emai1: Jason@jasonengincX1i BIT L. PAGE ?>fpOF ~ 174 APPENDIX B PRELIMINARY LEVEL 1 DOWNSTREAM ANALYSIS 175 EXHIBIT ~ PAGE-D-OF ~ LEVEL ONE DOWNSTREAM ANALYSIS FOR S'TEEL LAKE CREST 30642 28th Avenue South Federal Way, Washington 98003 April 2007, Rev May 2008 Prepared for: Prepared by: THE STEEL LAKE PLAT GROUP 30642 28TH AVENUE SOUTH FEDERAL WAY , WASHINGTON 98003 Brant A. Schweikl, P.E. REPORT #06066 "1 hereby state that this Level One Downstream Analysis for Steel Lake Crest has been prepared by me or under my supervision and meets the standard of care and expertise which is usual and customary in this community of professional engineers. I understand that the City of Federal Way does not and will not assume liability for the sufficiency, suitability or performance of drainage facilities prepared by me." This analysis is based on data and records either supplied to, or obtained by, Schweikl and Associates, pllc. These documents are referenced within the text of the analysis. The analysis has been prepared utilizing procedures and applications within the standard accepted practices of the industry. EXHIBIT ---L- PAGE1!..=OF -l6L 1176 06066 _REV-DSNarrative.doc STEEL LAKE CREST Parcel #'s"0921049096, 0921049161, 0921049182 & 0921049183 LEVEL ONE DOWNSTREAM ANALYSIS DOWNSTREAM NARRATIVE Project Location The proposed Steel Lake Crest Plat is located at 30642 28th Avenue South, Federal Way, Washington. The site falls between 28th" A venue South, on the west, and the Interstate 5 right-of-way to the east. Private property bounds the site on the north and south. Except for the northeast corner, which is clipped diagonally by Military Road South, the overall shape of the site is rectangular. It being approximately 100 feet longer east to west than north to south. Steel Lake lies directly to the west, and a small portion of the site (the extreme northwest corner) is within 200 feet of the lakes shoreline. Approximately one quarter mile due east of the site, across the Interstate 5 right-of-way, is Dolloff Lake. The location of these two lakes is relevant to the project because ultimately they receive the storm drainage from the site. The project consists of four existing parcels (parcel #'s 0921049096, 0921049161, 0921049182 & 0921049183) which total approximately 6.77 acres. The four parcels are owned by three individual parties who currently live in existing homes on the site. Their homes, the only existing residences on the site, all front off of 28th Avenue South. The project proposes removing their homes, creating 28 new lots and building new structures on them. The site naturally slopes from the southwest corner to the northeast corner. There is an approximn:e drop of70 feet across the site, with an average slope of 9.3%. There are a few small areas where the average slope exceeds 40%. The majority of these steep slope areas are not naturally occurring, but are the result of man made fills in the backyards of the existing homes. The areas around these existing homes are typically landscaped, with lawns and flower beds, and maintained by the home owners. Away from the landscaped yards, the site is mostly non-maintained native vegetation. The site is wooded with many large fir trees. Generally speaking, the further east you go the heavier and denser the underbrush becomes. EXHIBIT L PAGEAOF J6D.. 2177 06066 _REV-DSNarrative.doc Basin The prominent hydrology feature of this project is that the site lies in two different drainage basins. The portion of 28th A venue South which fronts the project site is essentially the dividing line between the Lower Puget Sound Basin and the Mill Creek Basin. Currently flows from the roadside ditch on the eastern edge of 28th Avenue South, enter into a culvert at the northwest comer of the project site, where it gets conveyed eventually to Steel Lake. Steel Lake is in the Lower Puget Sound Drainage Basin and is part of the Central Puget Sound Watershed. Because the topography of the site slopes northeasterly away from 28th Avenue South, any storm water from the site which does not get into the roadside ditch will naturally flow northeast, away from Steel Lake. This is the majority of the storm water drainage from the site. The natural point of discharge for this storm water is along the northeast boundary line. This runoff will eventually make its way to Dolloff Lake. Dolloff Lake is part of the Mill Creek Drainage Basin and Duwamish-Green River Watershed. The project lies within the Duwamish-Green River King County Water Resource Inventory Area (WRIA) Code Number 9. According to the King County Districts and Development Conditions Report, there are no mapped hazards (Coal Mine, Erosion, Landslide or Seismic) at the site, and the site is not located in a Critical Aquifer Recharge Area. Wetland Inventory The 1990 King County Wetland Survey was accessed to determine the location and classification of potential wetlands in the vicinity of the project. No wetlands were found to be present on the site. There is an existing wetland east of the Interstate 5 right-of- way, associated with Dolloff Lake, that's approximately one-quarter ofa mile from the site. There are no other mapped wetlands in the vicinity of the project. King County Soils Survey The King County Soils Survey Maps provided by the United States Department of Agriculture Soil Conservation Service were reviewed to determine the soil characteristics within the project basin with respect to the soils susceptibility to landslides and erosion and its capability for groundwater recharge and surface water runoff. Upon their review, the maps indicate the soils in the project area are Alderwood type soils. Typical Alderwood soils are moderately well drained, undulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches. Jason Engineering & Consulting Business, Inc., a geotechnical engineering firm, has been retained to perform soil testing on the site. Their report titled Subsurface Exploration and Geotechnical Engineering Report, is dated June 20, 2007 (Appendix A.) The report classifies the western half of the project as Alderwood (AgB) ~oils and the 178 EXHIBIT I, f~~R~~Qf Jb[ 3 eastern half of the project as Alderwood (AgC) soils. See their complete report for additional geotechnical information. Federal Emergency Management Agency (FEMA) FloodplainIFloodway Maps FEMA Floodplain/Floodway Maps were reviewed and there were no identified 100 year or 500 year floodplains on the project site. Storm Drainage Complaints The City of Federal Way Surface Water Management Division and the King County Department of Natural Resources and Parks, Stormwater Services (SWS) Section were contacted concerning the acquisition of any necessary storm drainage complaints in the general vicinity of the project or along the path of the downstream. The county listed five complaints of which three were unavailable and deemed not relevant due to age. The other two complaints come from Steel Lake frontage neighbors which experienced some flooding from a storm event in late November, 1990. A copy of their complaints' are attached to the back ofthis report. JeffWolfP.E., City of Federal Way Surface Water Management Engineer, responded in an e-mail dated May 20, 2008 that there have not been any drainage complaints or issues that have not been resolved in either of the sites downstream basins. He did state that flooding used to occur along S. 304th Street near Dolloff Lake, but the county constructed a flood control berm which apparently corrected the problem. No complaints have ever been filed from any of the projects parcels, and no records exist of any complaints having ever been filed from the projects adjacent parcels. Level One Downstream Narrative The following Level One Downstream narrative corresponds with the physical downstream inspection conducted on Friday, April 20, 2007. The photographs referenced in this narrative are shown in Appendix 1 of this report. All photos were taken during the inspection mentioned above, and their locations are identified on the map found in Appendix II. The temperature at the time of the field inspection was approximately 60 degrees and the weather was mostly cloudy with occasional sun. There had not been any rainfall over the previous couple of days to generate any new runoff, and for the most part the ground surfaces were dry. The natural discharge point for the majority of the project sites area (everything east of the roadside drainage ditch adjacent to 28th Avenue South's edge-of-pavement), is essentially the projects northwest corner property line with Military Road South. This area of the site is heavily vegetated. Photos A and B are looking towards the project site interior from the northeast. Once the flow leaves the site it joins with any flow collected in the roadside ditch along the west side of Military Road. This ditch flow comes from the north at the South 304th Street intersection, Photo C. Any drainage from this ditch 4179 EXHIBIT L OM&EDsLf.'e'~F J6f' would flow south through a 12 inch concrete culvert under the northern adjacent parcels driveway, and enter into the projects frontage with Military Road, Photo D. Here the combined flow would follow the Military Road right-of-way in an undefined ditch, (Photo E) bending southeast approximately 50 feet towards a flat grassy area (Photo F) located at the northwest corner of the projects frontage with the Interstate 5 right-of-way. Although the natural terrain in this area slopes east towards Dolloff Lake, Military Road and Interstate 5 effectively block any storm water runoff at this grassy area, Photo G. The state Department of Transportation however, provides an 18 inch concrete culvert (Photo H) that allows drainage under both Military Road and Interstate 5. The culvert was installed with a measured slope of 13% downward in an easterly direction. It has a length of about 190 feet and terminates in a Type 2 catch basin located in the north shoulder of Military Road directly under the north bound overpass of Interstate 5. Three other drainage lines input to this catch basin, with one 18 inch line actually providing flow. The line was coming from a large inaccessible storm drainage manhole located between the north and south bound freeway lanes, and it is assumed that it is part of the interstates drainage system. The output from the Type 2 catch basin is through an 18 inch CPEP pipe that extends 44 feet before discharging along the north side of Military Road, Photo I. There is now base flow associated with this part of the downstream. The channel is about 2 inches deep and about 2 feet wide, but the flow is slow. The channel meanders northwesterly through heavy brush (Photo J) for about 340 feet until it intersects 31 st A venue South. An 18 inch CMP culvert placed under the 31 st Avenue South right-of way allows the flow to pass from the west side of the road (Photo K) to the east side (Photo L). The culvert is approximately 50 feet long and appears to be relatively free of sediment. The flow continues east from here in a shallow channel, through a heavily vegetated marshy area, Photo M. The main body of Dolloff Lake is just under 100 feet away. This side of the lake is very swamp like, with thick under brush and becomes somewhat inaccessible (Photo N). The runoff does however enter into the lake at this point, Photo 0, where it will eventually drain to Mill Creek, the Green River and finally Puget Sound. Because 28th A venue South is the division between two basin areas, a small portion of the project drains west, and discharges to Steel Lake. This is primarily the offsite area of the project, the runoff from the east half of 28th Avenue and whatever runoff that makes it into the road side ditch fronting the west edge of the site (Photo P). The ditch ends at the existing driveway at the northwest comer of the project site. Here a 12 inch concrete culvert conveys any flow in the ditch northwest to a Type I catch basin located in the west shoulder of 28th A venue South. The culvert is approximately 65 feet long and was installed with a 5.7% slope. At the catch basin, runoff from the site joins runoff from the west side ditch of 28th A venue. This runoff starts south of the site at the northwest comer of the intersection of 28th Avenue and South 309th Street, Photo Q. It flows north in a ditch until it reaches a 12 inch concrete culvert approximately 100 feet south of the catch basin, Photo R. Leaving the initial catch basin, the flow will travel north approximately 200 feet, tight-lined in a 12 inch concrete pipe, through two more Type 1 catch basins (Photo S), until at a third Type I catch basin it is directed west towards a storm drainage manhole on private property (Photo T). At the manhole, the runoff is joined by flow from an 18 inch concrete culvert. The culvert drains a small area directly ~IT L. PAGE~OFlblt 5 180 06066 _REV-DSNarrative.doc A venue. The output of the manhole is an 18 inch concrete pipe that heads west and discharges into Steel Lake, Photo U. Access to the actual discharge point, which is on private property, is restricted (Photo V). The outlet to Steel Lake flows to the northwest, and eventually reaches Puget Sound at Redondo. Summary In summary, the downstream field observations and analysis of the two separate drainage basins show that they are in good condition. The project proposes releasing storm water from the developed site in a manner consistent with the prescribed methods of the City of Federal Ways storm water design manual. Storm water discharged into the Mill Creek Basin will be subjected to Level 1 Detention and Basic Water Quality via a combined wet pond system. The minimal runoff generated by the new impervious surfaces, created by the required street improvements to 28th A venue South, will be treated for water quality by the installation of a catch basin filter. The treated runoff will then be conveyed in the existing storm water system, and discharged into Steel Lake. Both basins do not display signs of erosion or flooding and should easily accommodate the increased net volume of flow associated with the development. EXHIBIT ~ PAGE~OF . 6 181 06066 _REV-DSNarrative.doc AJ!pendices Appendix 1 Downstream Photographs Appendix II Downstream Basin Map 7182 EXHIBIT L PAGE~OF _ 06066 _REV-DSNarrative.doc Photo A 183 IT PAGE~OF .Iai Photo 8 Photo C Photo D 184 EXHIBIT PAGE~OF ~ Photo E 185 EXHIBIT L.. PAGE~OFJixi Photo F Photo G 186 EXHIBIT ..~ PAGE~OF ltlL Photo H 187 '- l,. EXHIBIT ]Dl[ PAGE~OF Photo J Photo L 188 Photo M 189 ~XHIBIT ~GE.sLOF -UIL Photo N Photo 0 Photo P EXHIBIT l, PAGE~OFlllr 190 Photo Q 191 ~)(liIBIT. L.. GE-B-OFlaJ Photo R Photo S 192 EXH~T (, PAGE OF .JO... Photo T Photo U Photo V 193 EXHISIT t.. PAGE~OF Jal > Q? } till I" l! '",', J~II~~ i ~.--H I -: -I i ~ I: I I ~ ; I, ~.' :l'l- ~ ~~---tj I 'I- -7~il-'''-'''''!,' ill I ~ 0 _ ;! ,',. ~,i_ Fl '1 \'/\ t-ft~. ' 'I' --_: ' ~~ ~ ~,- - '" I---I! , I ~ ~, ' , - '''f "".. ~ i ',. "'I ;: , i ! i \. 0 0 - : L-."T'T"t-- n-'! , ~ i ~ o~, ~! lot.:; .L':>; i II', !! 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'i'l'tY Phone:JS:3 --;}- '7 ~ - f./'I6Y From: Cindy Torkelson WLR Storrmyater Services Section Phone: 206-296-1900 Fax Number: 206-296-0192 IMPORTANT I&VEL 1 A1YALYSIS NOTE: We do not send copies of certain complaint types that are not relevant such as BCW, PI, FIR, Fill and WQA, and we do not send CL and LS types. See key below. Type S 1, 82 and 83 will not be faxed due to size constraints. * IF YOU ARB USJNG THE 200S SWM DESIGN MANUAL YOU ONLY NEED IOYlS WORm OF COMPLAINTS The following is a list of complaint types received by the Water and Land Resources Stormwater Services Section. Complaint numbers beginning prior to 1990-XXXX have been archived and are no longer in our possession. They can still be retrieved, if necessary, but will take additional time and may not be beneficial to your research due to their age, development which has occurred, etc. If you are interested in reviewing the actual complaints, they can be pulled (time permitting) for your review. Copies can be obtained for $ .15 per page, and $2.00 per page for plans. Keys: Tvpe lIfInvestipti.oa 'bPc of rNblcm C. ~~~~I ~ ~v~oo DCW Busines5' for Clean Wiler DOM Drainage. Miscellmeous CCF RcIpoDse to Jnquhy DES DnIina&e - Erosioc'Sectimellllion *CL Claim DLE Draiuaae _ LancblidelEarth.Movement Ell Ertforcement OD HoM DTA l'.>fab1. toclmical MWlaucc ER .EI1fotc:emeot Review INQ DlJil1llge _ Gcnmllnqujry FCC,FCR,FCS Facility COItIp1aints MMA MainlaW1Ce. AaIhelic:8Fl SWM Foe Inquiry MMF MainleJWlCe. Plooding PIR. SWM Fee Review MMO Mainl8l1aftCe . Genetai PlH SWM Fllll on Hold MMM Mailllell8llce _ Mowillg "LS I.aw3uit MNM Maintenance _ Needs Maintenance RR Facility Engineering ReYiew MNW Main1l:lm1ec-Noxious WecIds NDA Neiabborhood Drtinage Assistlnce SWF SWM Fee Questions WQC . Water Quality Complaint WQB W.~ Qoa~ _ Best Manaaement Practices WQB Water Quality Bnfon:r.mcnt WQD Waler QaaJity_ ~ WQR Water Quality Baginee;ringReview WQI Walcr~ty-DIioitCon&w&tbHIBIT' WQA WarerQuaIity Audit REM BWM Fee ~f . J\ V WQO Water Quality - Other GRT SWM Pee>Ormt . Sl,S2.SN3 Bu~SIudiCl NWD SWMFe&-NewDisc:ount ,GE~-= a .Subjecr: to Public Disc:Iosurerequfrements I. ~ of'Mi_ RqUlStfur ~lS:l. R;vk:w IIId ~al \Jy ~8 A.Uomey't oftlco -I . JUlt I~. LVV I I: ,jrM 1\1 N \] \..V. YY L 1\ U I'V. ') '-' Jr. l PIN Complaint# 921079220 1987..()282 archived 921049229 1975-0108 archived 92104918419n-0053 archived ~~~~~ ~~~rIAL~~ 199 EXHIBIT " PAGE-'LOF 11Hl NU ,ty3-r, ~_19. 2001 . I: \,4!.~G c.K.!..N~. ~~ I W~~PARTMENT OF PUBLIC WORKS ~. ~UAFACE WATER MANAGEMENT DIVISION COMPLAINT INVESTIGATION REPORT ~ ~l r ~@ LOCATION: Dille Rec'cr: 9 1-~7~ () see TWP~RGE _ KROLL PG. _ Z~ COUNCIL DIST. /' ~ :t$-.g WORK: - ~ COMPLAIN,,4NT: :7'(~ Address ~~:l3 -2f- , DETAlI.S OF COMPlAINT: r 4U~~ f) j;?~ ~/f-:?7.YtJ. SLU 111 .t: 111 f:::~~) Oenw..s OF INVESrlGAnON' Sketch on """"" sklo: y.. "" 0 Photos: Y.. ~No 0 1.:1: 18'.90' UDs erved -,at!! and' met with M rs. Spa ne, She pointed out t fi~""""d 1 and sea Pl ng 1 n the path of flow apparently coming from across the neighbor's property to the south. That property is considerably higher than Spane's. In fact most of the area is higher than Spane's except one or two lots further north, Spane's and those lots are On Steel lake. Spane had numerous complaints about the neighbor to the South:not allowing she & her husband on the property to clean the stono dratn, not Cleaning the pine needles out of the drain, not keeping the yard up. too ..ch garbage. SUing everyone, etc, etc, The neighbOr to the south receives drainage flow from the south and east due to terrain. There is a moderate slope above, whereas the slope drops abruptly onto SpaDe's. A catch basin is located In the driveway to this neIghbor's and another neighbor further south. Th!s baSin receives water fr~ the south through a 12' concrete pIpe and from SUrface flow On the paved driveway, ThIs neighbor owns half Of the driveway, The Wa Ulr then d j Scharges no rth through a 12" concrete pIpe. J did no t see the te I'll 1 nus of this pipe. Spane contends that It was damaged mid-run during the neighbor's bulldozing activities this year. J suggested to her that this sHuHi 00 apPeared to be a prl vate probl... and that the County did not to appear to have any involvement. SEE ljO. fSfe,ft, SNJTIL'I J/rt-c.llf tdJ",J. CoMPLAINT INVESTlGATEO BY; ACTION TAKEN: 9tn~c)$v'~ <. I~ OAn:: '-] ~~ Y.e} - / S, " I.XJmplainant advised of action possible or taken by; Phone}Y Letter 0 Personal Contact CJ Complaint Action Handled By 200 ClOSed: ~.. .1~=- *7/ OK'd: ""'~ ~.. I)"~ LVVl (,,1 'I M I I; :J'trm. co"!"U \iV, "LI\~ARTMENT O"F pug. II'" 'A/O RK"v, )l'J. I, J r\1I'tU UI'f I , UO"M ~. ~ <.~).7,.. SURFACE WATER MANAGEMENT DIVISION 1200 COMPLAINT INVESTIGATION REPORT %;r:..,-~" /)4.:3 NAnJREOFCOMPLAINT: 1)MIJ.H~ 'c17 tJO~Ic~~~ LOCATION: '5'TC?itt. U~C:- COMPLAINANT: (! ~ D L, Y #' '5:# J-r/ I!. '" Address 30 Go 3 7 ~?' H AVtF .,spCity ~ wlA~tateJil'~ DETAJLS OF COMPLAINT: ~" 5Y,-r(c..y '--'I.I~' IN " 0 ,*:b t?'lI't:14P~ ~ctF)l. ,I f)fP1/AJ~..,;- f''1~'7~' ''''tV, ~oJr'H -A~IIIt7H {Ap"., $:,.712,4 .fa 7rf:#rlr~. .IJr:t.I,ltM-p oF" 7Y~f~ /~ S ~/t. o:f) A_lJt""i...1( ~~..;~ V~ /V Her-;1/( Y Ih<P ,..IJV ;:) 4?".pJ? I'~. Cf~ t::v~, 1)0 ~ FrU,..~<: .IF ~W ?dc.j) )K4.... 1b ~.0 "- ~O/~ I ~ ChR-.~J K~d p,~ ~ tl-S. 'Nu P.'tijli ;'''f",~...J~ . 9"~~""3 7 COMPLAI REcEIVED BY: 'c:rAILS OF INVESTIGATION: S ch 011 r5e liid~ YjlS f)( No Q JlhotO$: Ye(l.~ No 0 Observed site and .met carolyn Snl lly feD "l,rgl.Also on Sl I) on Dec. 18.'90. The house is on a moderate slope to Steel Lake, on the east side. A paved private driveway leads the first 200t! from 28th Ave S. towards her house. She owns the driveway, however the neighbors above her along 28th paved it without her consent. The driveway was graded with a trough in the center leading to a standard Type I CB halfway from 28th S. to her house. I observed a 12" pipe leading out of the CB, but since it's on private property I did not thoroughly view the interior with Q-beam and mirror. Snitily says the pipes are actually only 4" and drain from various single- family residences ~o the south. She bought the house in 1978 and 10 years ago hired a civil engineer from the East Side to gather evidence about the POSSible flood damage she could sustain from the neighbor's work on paving the driveway and the existing storm lines they intercepted. This engineer testified that the storm system collected apprOximately 6 acres and. that he had traced it up to S. 309th St. by going through people's backyards, but there were no eB's in the line. '. Snitily says the line ruptured in Dec.'89 and has been filled with sediment and Ov~r- flowing since. She says the runoff flows down to the north onto Spane\s and the,other further north neighbor. She also receives a portion of it. It has saturated her basement. A 4" concrete line drains from the northeast corner of her. house near her driveway then to the northwest into the corner of her ~ot then onto Spane's and into ~WtNvES,y~B4rainage lans & Sllrvey notes for S.312th do.n.ot shoWD1re?f;ni~~J' 9 ACTION TAKEN: drainage system conveying all the way from there northward. An equalizer Pipe~J.!:ptts~ but not found near 28th S. (50'-70' west) during the 1968 survey. )-1 Jt/_~ ~ ~~1< .J $,;11'" h.n-c pJu,y;. . . EXHIBIT ~ rRr'CTrx'f"l~ ~mplainant advised of action pOSsible or taken by: ~-'~r eF~tact 0 Complaint Action Handled By 201 Closed: 1- 3c9 - 9'0 OK'd:-1I6 "- ~e l~ill.1J Clate fleq'(l: /)- see TWP~RGe KROLL PG. COUNCIL DIST. 7 .rJ't .. ~~ f,.l- S .1.3...'3 Zi rlO.." WORK: vU11. 1'1. LVV I I : ~nrM 1\ 1 I1U \IV. "ll\U 11 V, :JOJ...r,...o. . .' . Sketch Sft=EL -1.... LAKE ...A... 'f.. 'Al G- CDutJr'l ( r I ,I I f J I I L S., 311-11\. st. L.._. __'" .._...._. ...._ S. 30q t1l sf PARI; .. .. , . . '. " ..' EXH'af~' ' PAGE-'d-OF atm" ... .....e.._ -""'7' 0 Ie I .De-\e~el"" fl~'~~ B1Jt'l S ..:v2 "t.- .;)"'1) A,,~ .J vi "50 .'~;: v ,"Iii,;' 1'1- . 9 fi OQ3 M.<:.. -HI. 1./ A ... '^ u ../' I . I V)1 I \ij; ~. I ~ i '~ ' I ~ i I . I i I {' i' I N Scale ! , I , i' I I I i I APPENDIXC DRAINAGE FACILITIES MAINTENANCE STANDARDS EXHIBIT L- PAGEj,S OF J<<r. 203 MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO.1 - DETENTION PONDS Maintenance Component Conditions When Maintenance Is Needed Results Expected When Maintenance Is Performed Defect Trash & Debris Trash and debris cleared from site. General Any trash and debris which exceed 1 cubic foot per 1,000 square feet (this is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping. Poisonous Vegetation Any poisonous or nuisance vegetation which may constitute a hazard to County personnel or the public. Pollution Oil, gasoline, or other contaminants of one gallon or more QI any amount found that could: 1) cause damage to plant, animal, or marine life; 2) constitute a fire hazard; or 3) be flushed downstream during rain storms. Unmowed Grass/ If facility is located in private residential area, Ground Cover mowing is needed when grass exceeds 18 inches in height. In other areas, the general policy is to make the pond site match adjacent ground cover and terrain as long as there is no interference with the function of the facility. Rodent Holes Any evidence of rodent holes if facility is acting as a dam or berm, or any evidence of water piping through dam or berm via rodent holes. Insects When insects such as wasps and hornets interfere with maintenance activities. Tree Growth Tree growth does not allow maintenance access or interferes with maintenance activity (I.e., slope mowing, silt removal, vactoring, or equipment movements). If trees are not interfering with access, leave trees alone. Eroded damage over 2 inches deep where cause of damage is still present or where there is potential for continued erosion. Side Slopes of Pond Erosion Storage Area Sediment Accur- ::ated sediment that exceeds 10% of the designed pond depth. Pond Dikes Settlements Any part of dike which has settled 4 inches lower than the design elevation. Only one layer of rock exists above native soil in area five square feet or larger, or any exposure of native soil at the top of out flow path of spillway. Rip-rap on inside slopes need not be replaced. Emergency Rock Missing Overflow/Spillway 204 No danger of poisonous vegetation where County personnel or the public might normally be. (Coordination with Seattle-King County Health Department) No contaminants present other than a surface film. (Coordination with Seattle/King County Health Department) When mowing is needed, grass/ground cover should be mowed to 2 inches in height. Mowing of selected higher use areas rather than the entire slope may be acceptable for some situations. Rodents destroyed and dam or berm repaired. (Coordination with Seattle/King County Health Department) Insects destroyed or removed from site. Trees do not hinder maintenance activities. Selectively cultivate trees such as alders for firewood. Slopes should be stabilized by using appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. Sediment cleaned out to designed pond shape and depth; pond reseeded if necessary to control erosion. Dike should be built back to the design elevation. Replace rocks to design standards. EXHIBIT l,. PAGE" OF~ NO.4 - CONTROL STRUCTURElFLOW RESTRICTOR Maintenance Component Results Expected When Maintenance is Performed Defect Condition When Maintenance is Needed General All trash and debris removed. Cleanout Gate Orifice Plate Overflow Pipe Manhole Catch Basin Trash and Debris (Includes Sediment) Structural Damage Damaged or Missing Damaged or Missing Obstructions Obstructions Distance between debris build-up and bottom of orifice plate is less than 1-1/2 feet. Structure is not securely attached to manhole wall and outlet pipe structure should support at least 1,000 Ibs of up or down pressure. Structure is not in upright position (allow up to 10% from plumb). Connections to outlet pipe are not watertight and show signs of rust. Any holes-other than designed holes-in the structure. Cleanout gate is not watertight or is missing. Gate cannot be moved up and down by one maintenance person. Chain leading to gate is missing or damaged. Gate is rusted over 50% of its surface area. Control device is not working properly due to missing,out of place, or bent orifice plate. Any trash, debris, sediment, or vegetation blocking the plate. Any trash or debris blocking (or having the potential of blocking) the overflow pipe. Structure securely attached to wall and outlet pipe. Structure in correct position. Connections to outlet pipe are water tight; structure repaired or replaced and works as designed. Structure has no holes other than designed holes. Gate is watertight and works as designed. Gate moves up and down easily and is watertight. Chain is in place and works as designed. Gate is repaired or replaced to meet design standards.. Plate is in place and works as designed. Plate is free of all obstructions and works as designed. Pipe is free of all obstructions and works as designed. See 'Closed Detention Systems" Standards No.3 See "Closed Detention Systems' Standards No. 3 See 'Catch Basins' Standards No. 5 See 'Catch Basins" Standards No.5 205 EXHIBIT ~ PAGE-'LLOF ~ NO.5 - CATCH BASINS Maintenance Component Defect Results Expected When Maintenance is perfonned Conditions When Maintenance is Needed General Trash & Debris (Includes Sediment) Structure Damage to Frame and/or Top Slab Cracks in Basin Walls/ Bottom SedimenU Misalignment Trash or debris of more than 1/2 cubic foot which is located immediately in front of the catch basin opening or is blocking capacity of the basin by more than 10% Trash or debris (in the basin) that exceeds 1/3 the depth from the bottom of basin to invert the lowest pipe into or out of the basin. Trash or debris in any inlet or outlet pipe blocking more than 1/3 of its height. Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g., methane). Deposits of garbage exceeding 1 cubic foot in volume Comer of frame extends more than 3/4 inch past curb face into the street (If applicable). Top slab has holes larger than 2 square inches or cracks wider than 1/4 inch (intent is to make sure all material is running into basin). Frame not sitting flush on top slab, I.e., separation of more than 3/4 inch of the frame from the top slab. Cracks wider than 1/2 inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that structure is unsound. Cracks wider than 1/2 inch and longer than 1 foot at the joint of any inleU outlet pipe or any evidence of soil particles entering catch basin through cracks. Basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. No Trash or debris located immediately in front of catch basin opening. No trash or debris in the catch basin. Inlet and outlet pipes free of trash or debris. No dead animals or vegetation present within the catch basin. No condition present which would attract or support the breeding of insects or rodents. Frame is even with curb. Top slab is free of holes and cracks. Frame is sitting flush on top slab. Basin replaced or repaired to design standards. No cracks more than 1/4 inch wide at the joint of inleUoutlet pipe. Basin replaced or repaired to design standards. EXHIBIT ~ PAGE~ 9 206 NO.5 - CATCH BASINS (CONTINUED) Maintenance Component Results Expected When Maintenance is perfonned Defect Conditions When Maintenance is Needed Fire Hazard Vegetation Pollution Catch Basin Cover Cover Not in Place Ladder Metal Grates (If Applicable) Locking Mechanism Not Working Cover Difficult to Remove Ladder Rungs Unsafe Trash and Debris Damaged or Missing. Presence of chemicals such as natural gas, oil and gasoline. Vegetation growing across and blocking more than 10%. of the basin opening. Vegetation growing in inlet/outlet pipe joints that is more than six inches tall and less than six inches apart. Nonflammable chemicals of more than 1/2 cubic foot per three feet of basin length. Cover is missing or only partially in place. Any open catch basin requires maintenance. Mechanism cannot be opened by on maintenance person with proper tools. Bolts into frame have less than 1/2 inch of thread. One maintenance person cannot remove lid after applying 80 Ibs. of lift; intent is keep cover from sealing off access to maintenance. Ladder is unsafe due to missing rungs, misalignment, rust, cracks, or sharp edges. Grate with opening wider than 7/8 inch. Trash and debris that is blocking more than 20% of grate surface. Grate missing or broken member(s) of the grate. Maintenance Components NO.6 DEBRIS BARRIERS (E.G., TRASH . RACKS) Condition When Maintenance is Needed No flammable chemicals present. No vegetation blocking opening to basin. No vegetation or root growth present. No pollution present other than surface film. Catch basin cover is closed Mechanism opens with proper tools. Cover can be removed by one maintenance person. Ladder meets design standards and allows maintenance person safe access. Grate opening meets design standards. Grate free of trash and debris. Grate is in place and meets design standards. Defect Results Expected When Maintenance is Perfonned. General Barrier clear to receive capacity flow. Metal Trash and Debris Damaged! Missing Bars. Trash or debris that is plugging more than 20% of the openings in the barrier. Bars are bent out of shape more than 3 inches. Bars are missing or entire barrier missing. Bars are loose and rust is causing 50% deterioration to any part of barrier. Bars in place with no bends more than 3/4 inch. Bars in place according to design. Repair or replace barrier to design standards. EXHI8IT~ PAGE--'JLOF ....!I&.. 207 NO.7 - ENERGY DISSIPATERS Maintenance Components Results Expected When Maintenance is Performed. Defect Conditions When Maintenance is Needed External: Rock Pad Dispersion Trench Internal: Manhole/ Chamber Missing or Moved Rock - Pipe Plugged with Sediment Not Discharging Water Properly Perforations Plugged. Water Flows Out Top of .Distributor" Catch Basin. Receiving Area Over-Saturated Worn or Damaged Post. Baffles, Side of Chamber Other Defects Only one layer of rock exists above native soil in area five square feet or larger, or any exposure of native soil. Accumulated sediment that exceeds 20% of the design depth, Visual evidence of water discharging at concentrated points along trench (normal condition is a .sheet flow' of water along trench). Intent is to prevent erosion damage. Over 1/2 of perforations in pipe are plugged with debris and sediment. Maintenance person observes water flowing out during any storm less than the design storm or its causing or appears likely to cause damage. Water in receiving area is causing or has potential of causing landslide problems. Structure dissipating flow deteriorates to 1/2 or original size or any concentrated worn spot exceeding one square foot which would make structure unsound. See "Catch Basins' Standard NO.5 Replace rocks to design standards. Pipe cleaned/ flushed so that it matches design. Trench must be redesigned or rebuilt to standards. Clean or replace perforated pipe. Facility must be rebuilt or redesigned to standards, No danger of landslides. Replace structure to design standards. See .Catch Basins" Standard No. 5 .....~~~ ~"-!T.---k t., !,,,.:t ~~""t 1~~i~4;:.;~~ IOF 'N} ''4.~t: ~ ....IKL- 9 208 NO.8 - FENCING Maintenance Components Defect Results Expected When Maintenance is Performed Conditions When Maintenance is Needed General Missing or Broken Parts Parts in place to provide adequate security. Erosion Wire Fences Damaged Parts Deteriorated Paint or Protective Coating Openings in Fabric NO.9 - GATES Any defect in the fence that permits easy entry to a facility. Erosion more than 4 inches high and 12-18 inches wide permitting an opening under a fence. Post out of plumb more than 6 inches. Top rails bent more than 6 inches. Any part of fence (including post, top rails, and fabric) more than 1 foot out of design alignment. Missing or loose tension wire. Missing or loose barbed wire that is sagging more than 2-1/2 inches between posts. Extension arm missing, broken, or bent out of shape more than 1 1/2 inches. Part or parts that have a rusting or scaling condition that has affected structural adequacy. Openings in fabric are such that an 8-inch- diameter ball could fit through. No opening under the fence that exceeds 4 inches in height. Post plumb to within 1-1/2 inches. Top rail free of bends greater than 1 inch. Fence is aligned and meets design standards. Tension wire in place and holding fabric. Barbed wire in place with less than 3/4 inch sag between post. Extension arm in place with no bends larger than 3/4 inch. Structurally adequate posts or parts with a uniform protective coating. No openings in fabric. Maintenance Component Defect Results Expected When Maintenance is Performed Conditions When Maintenance is Needed General Damaged or Missing Members Gates and Locking devices in place. Openings in Fabric Missing gate or locking devices. Broken or missing hinges such that gate cannot be easily opened and closed by a maintenance person. Gate is out of plumb more than 6 inches and more than 1 foot out of design alignment. Missing stretcher bar, stretcher bands, and ties. See "Fencing" Standard No.8 Hinges intact and lubed. Gate is working freely. Gate is aligned and vertical. Stretcher bar, bands and ties in place. See "Fencing" Standard NO.8 EXHIBIT L- PAGE--1LOF Jln 209 Maintenance Component NO. 10 - CONVEYANCE SYSTEMS (PIPES & DITCHES) Conditions When Maintenance is Needed Defect Results Expected When Maintenance is Performed Pipes Pipe cleaned of all sediment and debris. Open Ditches Catch Basins Debris Barriers (e.g., Trash Rack) Sediment & Debris Vegetation Damaged Trash & Debris Sediment Vegetation Erosion Damage to Slopes Rock Lining Out of Place or Missing (If Applicable). Accumulated sediment that exceeds 20% of the diameter of the pipe. Vegetation that reduces free movement of water through pipes. Protective coating is damaged; rust is causing more than 50% deterioration to any part of pipe. All vegetation removed so water flows freely through pipes. Pipe repaired or replaced. Any dent that decreases the cross section area of Pipe repaired or replaced. pipe by more than 20%. Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Accumulated sediment that exceeds 20 % of the design depth. Vegetation that reduces free movement of water through ditches. See "Ponds" Standard No. 1 Maintenance person can see native soil beneath the rock lining. See "Catch Basins: Standard NO.5 See "Debris Barriers" Standard NO.6 Mainteoance Component NO. 11 - GROUNDS (LANDSCAPING) Conditions When Maintenance is Needed Trash and debris cleared from ditches. Ditch cleaned! flushed of all sediment and debris so that it matches design. Water flows freely through ditches. See .Ponds" Standard No. 1 Replace rocks to design standards. See "Catch Basins" Standard NO.5 See "Debris Barriers" Standard NO.6 Defect Results Expected When Maintenance is Performed General Weeds present in less than 5% of the landscaped area. Trees and Shrubs Weeds (Nonpoisonous) Safety Hazard Trash or Litter Damaged Weeds growing in more than 20% of the landscaped area (trees and shrubs only). Any presence of poison ivy or other poisonous vegetation. Paper, cans, bottles, totaling more than 1 cubic foot within a landscaped area (trees and shrubs only) of 1,000 square feet. Limbs or parts of trees or shrubs that are split or broken which affect more than 25% of the total foliage of the tree or shrub. Trees or shrubs that have been blown down or knocked over. Trees or shrubs which are not adequately supported or are leaning over, causing exposure of the roots. No poisonous vegetation present in landscaped area. Area clear of litter. Trees and shrubs with less than 5% of total foliage with split or broken limbs. Tree or shrub in place free of injury. Tree or shrub in place and adequately supported; remove any dead or diseased trees. EXHIBIT~ PAGE.u..OF ~ 9 210 Maintenance Component NO. 12 - ACCESS ROADSI EASEMENTS Condition When Maintenance is Needed Defect Results Expected When Maintenance is Perfonned General Roadway free of debris which could damage tires. Road Surface Shoulders and Ditches Trash and Debris Blocked Roadway Settlement, Potholes, Mush Spots, Ruts Vegetation in Road Surface Modular Grid Pavement Erosion Damage Weeds and Brush Trash and debris exceeds 1 cubic foot per 1,000 square feet i.e., trash and debris would fill up one standards size garbage can. Debris which could damage vehicle tires (glass or metal). Any obstruction which reduces clearance above road surface to less than 14 feet. Any obstruction restricting the access to a 10 to 12 foot width for a distance of more than 12 feet or any point restricting access to less than a 10 foot width. When any surface defect exceeds 6 inches in depth and 6 square feet in area. In general, any surface defect which hinders or prevents maintenance access. Weeds growing in the road surface that are more than 6 inches tall and less than 6 inches tall and less than 6 inches apart within a 400- square foot area. Build-up of sediment mildly contaminated with petroleum hydrocarbons. Erosion within 1 foot of the roadway more than 8 inches wide and 6 inches deep. Roadway free of debris which could damage tires. Roadway overhead clear to 14 feet high. Obstruction removed to allow at least a 12 foot access. Road surface uniformly smooth with no evidence of settlement, potholes, mush spots, or ruts. Road surface free of weeds taller than 2 inches. Removal of sediment and disposal in keeping with Health Department recommendations for mildly contaminated soils or catch basin sediments. Shoulder free of erosion and matching the surrounding road. Weeds and brush exceed 18 inches in height or Weeds and brush cut to 2 inches hinder maintenance access. in height or cleared in such a way as to allow maintenance access. 211 EXH'.ID.T_ L PAGEJ~OrlDQ.: NO. 13- WATER QUALITY FACILITIES C.) Wetponds Maintenance Component Defect Condition When Maintenance is Needed Wetpond Results Expected When Maintenance is Performed Vegetation Trash and Debris Inlell Outlet Pipe Sediment Accumulation in Pond Bottom Oil Sheen on Water Erosion Settlement of Pond Dike! Berm Rock Window Overflow Spillway Vegetation such as grass and weeds need to be mowed when it starts to impede aesthetics of pond. Mowing is generally required when height exceeds 18-inches. Mowed vegetation should be removed from areas where it could enter the pond, either when the pond level rises, or by rainfall runoff. Accumulation that exceeds 1 CF per 1000-SF of pond area. fnlell Outlet pipe clogged with sediment and! or debris material. Sediment accumulations in pond bottom that exceeds the depth of sediment zone plus 6-inches, usually the first cell. Prevalent and visible oil sheen. Erosion of the pond's side slopes and! or scouring of the pond bottom, that exceeds 6-inches, or where continued erosion is prevalent. Any part of these components that has settled 4- inches or lower than the design elevation, or inspector determines dike! berm is unsound. Rock window is clogged with sediment. Rock is missing and soil is exposed at top of spillway or outside slope. Vegetation should be mowed to 4 to 5 inches in height. Trees and bushes should be removed where they are interfering with pond maintenance activities. Trash and debris removed from pond. No clogging or blockage in the inlet and outlet piping. Removal of sediment from pond bottom. Removal of sediment from pond bottom. Slopes should be stabilized by using proper erosion control measures, and repair methods. Dikel berm is repaired to specifications. Window is free of sediment and debris. Replace rocks to specifications. EXHIBIT~ PAGE.rLOF -WJl.. 9 212 APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ F ACIUTIES ~ NO. 20 - STORMFIL TER@ Maintenance Defect or Problem Condition When Maintenance Is Needed Recommended Maintenance to Component Correct Problem Media Section Sediment Sediment depth exceeds 0.25 inches. No sediment deposits that would Accumulation on impede penneability of the compost Media. media. Trash/Debris Trash and debris accumulated on compost filter Trash and debris removed from the Accumulation bed. compost filter bed. First Chamber Sediment Sediment depth exceeds 6 inches in first No sediment deposits in vault Accumulation chamber. bottom of first chamber. Drain Pipes Clean- Sediment When drain pipes, clean-outs, become full with Remove the accumulated material Outs Accumulation sediment and/or debris. from the facilities. NO. 21 - STORMFIL TER@ (CARTRIDGE TYPE) Maintenance Defect or Problem Condition When Maintenance is Needed Recommended Maintenance to Component Correct Problem Compost Media Plugged Drawdown of water through the media takes Replace media cartridges. longer than 1 hour, and/or overflow occurs frequently. Short Circuiting Flows do not property enter filter cartridges. Replace filter cartridges. Pipes Damaged Any part of the pipes that are crushed, damaged Pipe repaired and/or replaced. due to corrosion and/or settlement. Access Cover Damaged/Not Cover cannot be opened, one person cannot Cover repaired to proper working Working open the cover, corrosion/defonnation of cover. specifications or replaced. Vault Structure Damage to Wall, Cracks wider than Yz-inch and any evidence of Vault replaced or repaired to design Frame, Bottom, soil particles entering the Structure through the specifications. and/or Top Slab cracks, or maintenance/inspection personnel detennines that the vault is not structurally sound. Damaged Pipe Joints Cracks wider than Yz-inch at the joinl of any No cracks more than 'I.-inch wide at inleUoutlet pipe or any evidence of soil partiCles the joint of the inleUoutlet pipe. entering the vault through the walls. Baffles Damaged Baffles corroding, cracking warping, and/or Repair or replace baffles to showing signs of failure as detennined by specification. maintenance/inspection person. Access Ladder Damaged Ladder is corroded or deteriorated, not Ladder replaced or repaired and functioning property, missing rungs, cracks, and meets specifications, and is safe to misaligned. use as detennined by inspection personnel. ----- EXH'~IJ_ L-. PAGE..:D....OF. 2005 Surface Water Design Manual - Appendix A A-2713 1/24/2005 APPENDIX D INFORMATION SHEET for AGREEMENT & PERFORMANCE/ MAINTENANCE BOND EXHIBIT t;' PAGE..:zLOF ~ 214 PUBLIC WORKS DEPARTMENT INFORMAnON SHEET for AGREEMENT .. PERFORMANCE/MAINTENANCE BOND Applicant: Nature of Applicant's Entity: (i.e. Corporation, General Partnership, Umited Partnetship, Individual, elI:.) State of Incorporation: (it applicable) Individual Signing on Behalf of Applicant: (Name) (TiUe) Applicant's Phone: Fax Number: Applicant's Address: (Street) (City) (State) (ZIP) Project Name: Address: Permit Number: Bond Amount: Cash Deposit Amount: Bond Company: Bond Company Address: (Street) (Oty) (Slate) (ZIP) Bond Company Phone: Fax Number: Bond Company's State of Incorporation: Nature of Bond Prindpal's Entity: (i.a Corporation, General Partnership, Umited Partnership, Individual, etc.) Bond Principal's Name: Title of Person Signing on Behalf of Bond Prindpal: Bond Principal's Address: (Street) (Oty) (Slate) (ZIP) EXHIBIT L- PAGE.:n.=OF .HiL Information Sheet for Agreement & Performance/Maintenance Bond 1 215 Bond Principal's Phone: Fax Number: Property Owner's Name if Individual: Property Owner's Name if Proprietary Then: Spouse: Description of Work: Legal Description: k:\devtserv\dev stand manual\appendix - agree perm-maint bond forms.doc EXHIBIT l, Information Sheet for Agreement2& Performance/Maintenance Bond PAGE .::tS--OF--J,.I)... 216 APPENDIX E VICINITY MAP EXHIBIT I, PAGE-aOF -lQ[ 217 IOtST ! 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PAGE ~ OF~ 223 06066 STEEL TIME SERIES LAKE CREST ENTRY KCRTS Command CREATE a new Time Series ------------------------ Production of Runoff Time Series Project Location : Sea-Tac Computing Series PREDEVl.tsf Regional Scale Factor: 1.00 Data Type : Reduced Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTF60R.rnf Till Forest 5.89 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60R.rnf Till Grass 0.19 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf Impervious 0.54 acres Total Area 6.62 Peak Discharge: 0.717 CFS at acres 6:00 on Jan 9 in Year 8 Storing Time Series Time Series Computed File:PREDEV1.tsf KCRTS Command Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command Compute PEAKS and Flow Frequencies ---------------------------------- Flow Frequency Analysis Loading Stage/Discharge curve:predev1.tsf -------------------------------------------------------- Time Series File:predevl.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:PREDEV1.pks Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series ------------------------ Project Location : Computing Series Regional Scale Factor Data Type Production of Runoff Time Series Sea-Tac DEVl. t.s f 1.00 Reduced EXHI~~T_ , L, PAGE~OF ----= . 224 Record I.doc Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTG60R.rnf Till Grass 3.07 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60R.rnf Impervious 3.55 acres Total Area 6.62 Peak Discharge: 2.33 CFS at acres 6:00 on Jan 9 in Year 8 Storing Time Series Time Series Computed File:DEVl.tsf KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:devl.tsf -------------------------------------------------------- Time Series File:devl.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:DEVl.pks -Occ(. EXHIBIT L PAGE!lilOF]l)l> 2 225 Record I.doc 06066 STEEL LAKE PREDEVELOPED CREST BASIN Flow Frequency Analysis Time Series File:predevl. tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----F1ow Frequency Ana1ysis------- Flow Rate Rank Time of Peak - Pea ks Rank Return Prob (CFS) (CFS) Period 0.473 2 2/09/01 15:00 0.717 1 100.00 0.990 0.220 7 1/05/02 16:00 0.473 2 25.00 0.960 0.430 3 2/28/03 3:00 0.430 3 10.00 0.900 0.139 8 8/26/04 2:00 0.419 4 5.00 0.800 0.257 6 1/05/05 8:00 0.382 5 3.00 0.667 0.419 4 1/18/06 16:00 0.257 6 2.00 0.500 0.382 5 11/24/06 4:00 0.220 7 1. 30 0.231 0.717 1 1/09/08 6:00 0.139 8 1.10 0.091 Computed Peaks 0.635 50.00 0.980 EXHU31T_ L PAGElLoF -lOll- Created on 6/22/2007 9: 19 AM 226 PREDEVl.pks 06066 STEEL LAKE CREST DEVELOPED BASIN Flow Frequency Analysis Time Series File: devl. tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - Pea ks Rank Return Prob (CFS) (CFS) Period 1.14 6 2/09/01 2:0.0 2.33 1 100.00 0.990 0..898 8 1/0.5/0.2 16:0.0. 1. 37 2 25.0.0. 0..960 1. 37 2 2/27/0.3 7:0.0. 1.37 3 10.00 0.900 0.942 7 8/26/0.4 2:0.0. 1. 20. 4 5.0.0. 0..80.0. 1.14 5 10/28/04 16:00. 1.14 5 3.0.0 0..667 1. 20. 4 1/18/0.6 16:00. 1.14 6 2.00 0.500 1. 37 3 10./26/0.6 0.:0.0. 0..942 7 1. 3D 0..231 2.33 1 1/0.9/0.8 6:0.0. 0..898 8 1.10. 0..0.91 Computed Pea ks 2.0.1 50..0.0.. 0..980. EXHIBIT ~ PAGE~OF JtIL Created on 6/22/2007 9:23 AM DEVl.pks 227 06066 STEEL LAKE CREST Retention/Detention Facility PONDl Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Effective Storage Depth: Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Detention Pond 3.00 H:1V 94.76 ft 47.38 ft 4490. sq. ft 10903. sq. ft 0.250 acres 5.00 ft 100.00 ft 34609. cu. ft 0.795 ac-ft 5.00 ft 12.00 inches 2 Full Head Pipe Orifice # Height Diameter Discharge Diameter (ft) (in) (CFS) (in) 1 0.00 2.31 0.325 2 3.75 1. 86 0.105 4.0 Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation Surf Area (ft) (ft) (cu. ft) (ac-ft ) (cfs) (cfs) (sq. ft) 0.00 100.00 O. 0.000 0.000 0.00 4490. 0.02 100.02 90. 0.002 0.023 0.00 4507. 0.05 100.05 226. 0.005 0.032 0.00 4532. 0.07 100.07 316. 0.007 0.039 0.00 4550. 0.10 100.10 453. 0.010 0.045 0.00 4575. 0.12 100.12 545. 0.013 0.050 0.00 4593. 0.14 100.14 637, .0.015 0.055 0.00 4610. 0.17 100.17 776. 0.018 0.060 0.00 4636. 0.19 100.19 869. 0.020 0.064 0.00 46'13. 0.29 100.29 1338. 0.031 0.079 0.00 4', -i O. 0.39 100.39 1817. 0.042 0.091 0.00 48~8. 0.49 100.49 2304. 0.053 0.102 0.00 4916. 0.59 100.59 2800. 0.064 0.112 0.00 5005. 0.69 100.69 3305. 0.076 0.121 0.00 5095. 0.79 100.79 3819. 0.088 0.129 0.00 5186. 0.89 100.89 4342. 0.100 0.137 0.00 5277. 0.99 100.99 4874. 0.112 0.145 0.00 5369. 1. 09 101. 09 5416. 0.124 0.152 0.00 5462. 1.19 101.19 5967. 0.137 0.159 0.00 5556. 1. 29 101.29 6527. 0.150 0.165 0.00 5650. 1. 39 101.39 7097. 0.163 0.172 0.00 5745. 1. 49 101.49 7676, 0.176 0.178 0.00 5840. 1. 59 101.59 8265. 0.190 0.183 0.00 5937. 1. 69 101. 69 8863. 0.203 0.189 0.00 6 a) 4 . 1.79 101. 79 9472. 0.217 0.195 0.00 6132. EXHIBIT L, 228 PAG~OF -UL- 1. 89 101. 89 10090. 0.232 0.200 0.00 6230. 1. 99 101.99 10718. 0.246 0.205 0.00 6329. 2.09 102.09 11356. 0.261 0.210 0.00 6429. 2.19 102.19 12004. 0.276 0.215 0.00 6530. 2.29 102.29 12662. 0.291 0.220 0.00 6631. 2.39 102.39 13330. 0.306 0.225 0.00 6734. 2.49 102.49 14008. 0.322 0.229 0.00 6836. 2.59 102.59 14697. 0.337 0.234 0.00 6940. 2.69 102.69 15397. 0.353 0.239 0.00 7044. 2.79 102.79 16106. 0.370 0.243 0.00 7149. 2.89 102.89 16826. 0.386 0.247 0.00 7255. 2.99 102.99 17557. 0.403 0.251 0.00 7362. 3.09 103.09 18299. 0.420 0.256 0.00 7469. 3.19 103.19 19051. 0.437 0.260 0.00 7577. 3.29 103.29 19814 . 0.455 0.264 0.00 7685. 3.39 103.39 20588. 0.473 0.268 0.00 7795. 3.49 103.49 21373. 0.491 0.272 0.00 7905. 3.59 103.59 22169. 0.509 0.275 0.00 8015. 3.69 103.69 22976. 0.527 0.279 0.00 8127. 3.75 103.75 23466. 0.539 0.281 0.00 8194. 3.77 103.77 23630. 0.542 0.283 0.00 8217. 3.79 103.79 23794. 0.546 0.286 0.00 8239. 3.81 103.81 23959. 0.550 0.290 0.00 8262. 3.83 103.83 24125. 0.554 0.296 0.00 8284. 3.85 103.85 24291. 0.558 0.303 0.00 8307. 3.87 103.87 24457. 0.561 0.311 0.00 8329. 3.89 103.89 24624. 0.565 0.320 0.00 8352. 3.91 103.91 24791. 0.569 0.324 0.00 8375. 4.01 104.01 25634. 0.588 0.338 0.00 8488. 4.11 104.11 26489. 0.608 0.351 0.00 8603. 4.21 104.21 27355. 0.628 0.361 0.00 8718. 4.31 104.31 28233. 0.648 0.372 0.00 8834. 4.41 104.41 29122. 0.669 0.381 0.00 8951. 4.51 104.51 30023. 0.689 0.390 0.00 9068. 4.61 104.61 30936. 0.710 0.399 0.00 9186. 4.71 104.71 31860. 0.731 0.407 0.00 9305. 4.81 104.81 32797. 0.753 0.415 0.00 9425. 4.91 104.91 33745. 0.775 0.423 0.00 9545. 5.00 105.00 34609, 0.795 0.430 0.00 9654. 5.10 105.10 35580, 0.817 0.745 0.00 9776. 5.20 105.20 36564. 0.839 1.320 0.00 9898. 5.30 105.30 37560. 0.862 2.050 0.00 10021. 5.40 105.40 38568, 0.885 2.850 0.00 10145. 5.50 105.50 39589. 0.909 3.140 0.00 10269. 5.60 105.60 40622. 0.933 3.400 0.00 10395. 5.70 105.70 41668, 0.957 3.640 0.00 10521. 5.80 105.80 42726. 0.981 3.870 0.00 10647. 5.90 105.90 43797. 1.005 4.080 0.00 10775. 6.00 106.00 44881, 1.030 4.280 0.00 10903. 6.10 106.10 45978. 1.056 4.470 0.00 11032. 6.20 106.20 47088. 1. 081 4.650 0.00 11161. 6.30 106.30 48210. 1.107 4.830 0.00 11291. 6.40 106.40 49346. 1.133 5.000 0.00 11422. 6.50 106.50 50495. 1.159 5.160 0.00 11554. 6.60 106.60 51657. 1.186 5.320 0.00 11687. 6.70 106.70 52832. 1.213 5.470 0.00 11820. 6.80 106.80 54021. 1. 240 5.620 O'~}(tilE3l1r 11954~ 2 229 PAGE.K:OFIlf) 6.90 106.90 55223. 1. 268 5.760 0.00 12088. 7.00 107.00 56438. 1. 296 5.900 0.00 12224. Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (Cu-Ft) (Ac-Ft) 1 2.33 ******* 1. 58 5.24 105.24 36922. 0.848 2 1.14 ******* 0.73 5.10 105.10 35540. 0.816 3 1.13 0.43 0.43 5.00 105.00 34601. 0.794 4 1. 20 ******* 0.41 4.78 104.78 32561. 0.747 5 1. 37 ******* 0.38 4.42 104.42 29194. 0.670 6 0.71 0.26 0.26 3.31 103.31 19968. 0.458 7 0.90 ******* 0.21 2.05 102.05 11125. 0.255 8 0.94 ******* 0.20 1. 82 101.82 9664. 0.222 EXHlaIT_ L. PAGE~OF I6t..= Created on 6/22/2007 9:26 AM 3 230 POND I.doc \C \C = \C = ~ ~ u ~C-' oz ~~ ~~ II;:) ~o r1J~ ~s uZ ~~ -< ~ ~ ~ ~ ~ rIJ ('..\,Q....NN - -.- -- "'1->:' m 0 CT'l lJ') N ........I'LnLnN (D -.--Z" ~ .. ~ ~ C;~:O 0 0 <::) 0 CD .f[: '~ '. ~i~8~~~ "'1;WC'\IO"I.'I"""i\D tn''','" N 0'\ 0"\ 1""i C7' ("I)',.~M N 1""i 1""i In j ,fI,,\~ N....., lJ') N ~'~r-:~(\")OCD ";1",'-~~("I)N....-4 0'- ,'0 C C <::) 0 ...-t' , 1"""1 rt ...... ...-4 1"""1 o <a,",:;, Q'\ N 1"'""4 In N .-t-~"..qoMOCC: U)cli:~~"MN""" Mr)-.-tm\.O'l"""to r--.',..:""('f')N~N O~-OQCOO * '" * * : N = : * 0 ! * ! *! ... ... ... ... MLl)N.., 231 <.) o "0 N N \0 o r-- ~ c: Og o 0:: 2l o ~I \0 o \0 o ,. .a <l 'rl :0 .<: ., <l o ,. ... -a '" H 8' H "t:l >- ::Q <l o ... '" '" ~ ., .... H o ... In Il ., ~ ~ ] .... (5 N ~ EXHIBIT ~ PAGE~OF ~ '" .... il' +> (j) \C \C = \C = :u:= ~~ u~ .f:; " o~ ~u ~z I~ ~;:J ~o u~ ~~ <0 ~~ ~~ ~ ~ ~ 7Jl <.> 0 -0 do ~ u.. ~ 0 0) ~I 0 . 0) 0 \0 ..- ~ 0 00 0) 0 I,() . I,() 0). 0 \\I '0 ~> . 0) 0 <;"" "'0 0 'C 0 Q) a.. ~. . 00 EI,() :J Q) 0 0::: r-- .a . :0 0 (ll CD .a 0 "- a.. 0 Q) . I,() :> :;:::l (ll \\I '3 0 E o:t :J U 0 ("') . 0 \\I I::? o . '';j '1;' Ii) \? Ca.. ~~:~ :; G..UJ ,,0 ::.> UJ Wo::: 00.. I,() N ..... o ..- o 9 o ..... . (S.:IO) a6JelpSIO o ..... o o C:! N ~ t. ~ ~~~OF r.a~ 232 SECTION 3.2 RUNOFF COMPUTATION AND ANALYSIS METIIODS FIGURE 3.2.2.A RAINFALL REGIONS AND REGIONAL SCALE FACTORS ST 1.1 -:; IT E. - ST 1.1 LA 1.0 LA 1.2 \\ SNOHOMISH COUNTY KING CO.UNTY .-. ST 1.0 Rainfall Regions and Regional Scale Factors D 12:2:1 Incorporated AreaO ...... River/lakeD Major RoadO D EXHI~IT_ L.. PAGE~OF .JOO. ----"". 1/24/2005 3-~3 3 2005 Surface Water Design Manual ...--..." King County Department of Development and. Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Partl PROJECT0WNERAND PROJECT ENGINEER Project Owner STE:EL LAKE PLAT G/?ouP Address ? 0 '" I.r2 1S!A, AvE <;, (tDr-tAL Lv",!, (,.vA, ClBOoJ Phone ('25'>) qVb - ? /51 Proj~ Engineer 15~AJT ~ (' HL./Cf K L- Company 5'C{(l.dEIKI.. ~ ASf.r P(LC Address/Phone lAc O......,A , W ^ 2~3\ 272~t-{s' ;~8rt'~:~J:.QF'~l;RMlT :;AJ?PJ:1UATION -' Subdiviso ---- ~ Short $ubdivision Grading Commercial Other Part2 PROJECT LOCATION AND ,'DESCRIPTl0N Project Name $T[f"L (lIKE- CteE~ Location Township Range ........... ..Section 2-/ JJ fJ E 9 ,'Part4:0THERA'E\lIEWSAND PERMITS DFW HPA CaE 404 DOE Dam Safety FEMA Floodplain COE Wetlands ShoreJi~e Man~ge;~I) . '\' Rockery EYE 1'1 P T Structural Vaults ~ __~CfA -,- \ DOC ;V P DE5 . PartS. SITE COMMUNITY AND DRAINAGE BASIN Community Crt-,! OF f'j L)ffl. A-\. WI"--( (. 0(f.S/7e (wt:.ft ) I~EOONOO CF/V7ilA L- j-'V(; f,: T .!:o'-t"'Vo.:. Drainage Basin "2 - f;iF (Ukr) /'II ' ll- C-R Gre.[i: .;; -e (.)!J EE-l< J ,'.::., Ivt' ,_, Part 6 SITE CHARACTERISTICS River --... Stream Critical Stream Reach Depressions/Swales LakeZo o",fA It E [ (. 64(::. r::. Steep Slopes So ~ IUAN'ft1<udA- rl~~! .pYCr?pc/r;,"', Lfot'6 J Floodplain Wetlands Seeps/Springs High Groundwater Table Groundwater Recharge Other rOflf'/V1 bou;.rdo,,/ :;I,,{( {:o'-<) , 1.--'":; 234 EXHIBIT ~ PAGE!tLOF ~ ---.., ""' Part 10 SURFACE'WATERSYSTEM Grass Uned Tank Infiltration Method of Analysis Channel Vault Depression r-c..F27r /"sip;; SystenO Energy Dissapator Row Dispersal CompensationIMitigati .....'-.- .. .. - =-----~.....-.... on of Eliminated Site Open Channel Wetland Waiver Storage Dry Pond ' Stream Regional ~) Detention .~- ~ Brief De!;cription of System Operation I?/II <17E KUtVOFI' t'ot (En EO .L; .r',,"i\) Uf''! t '" 70 6.AlC' Ii e PO/VCJ ro~ /I),fr ft, &OA-LITY 1 ()ETAltvro prtfAr e Facility Related Site Limitations Reference Facility Limitation rOAJ P A/6 N If. :) PartU,., SmUCTUI;FfALANALYSIS ',' , Part12 'EASEMENTS/TRA.CTS Cast in Place Vault ~ - (A.) PO,{J D ~~4' High Structural on Steep Slope Other , 1)..ai~;g-;-E~ement; - p (' ! V ~ Ie c-J"r 1M ...-' d fa. A "'I (' AccesS Easement ~' Native Growth Protection Easement I /fra~"""::' 5" TO r A '- / ~ L 0.. 01 J. ("~fl ~ -I1"f'-f -' "-~_~.o:" I fJEIJEf?"fi'/4"u I'.4Ttf, 10,/"...""... f!9 '..) i,nth8r) . ~I EArE:i1!::~T Part13 SfGNATUREOF PROFESSIONAL ENGJNEER I or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the infonnation provided here is ac EXHIBIT ~ PAGEftOF ~ 235 KING COUNTY. WASHINGTON. SURFACE WATER DESIGN MANUAL STORMW ATER FACILITY SUMMARy SHEET S~U-~1f: 4e:g-r Date 5/Z3/08 ?JOb4--Z ~'7i\ :AlJENLt~ S, " ~~-I2I+C';W~--;, WA. 1~3 -- Development Location ENGINEER Name Fum Address Phone I Developed Site: Acres ? If:, 7 Phone Number of lots 28 Number of detention facilities on site: Number of infiltration facilities on site: 'f ponds --2- ponds o vaults ----'2- vaults o tanks --IL~ Flow control provided in regio!lPJ facility (give location) Nt /:r No flow control required Nj Ac Exemption number _ N {A. Downstream Drain e Basins o Basin A Basin B Basin C Basin D Number & type of water quality facilities on site: o biofiltration swale (regular/wet! or continuous inflow?) 1 combined detentionIWQ pond (WQ portion basic or large?) b i v combined detentionlwetvault C> compost filter o filter strip o flow dispersion D farm management plan (2 lanc",cape management plan o oil/Water separator (baffle or coalescing plate?) o catch basin inserts: Manufacturer . ~ pre-settling pond o pre-settling structure: Manufacturer o flow-splitter catclibasin DESIGN INFORMATION A nd Vr '2.0 *~ ~.E~'Pr L( 5cj-~)) c.:.... 1998 Surface Water Design Manual 1 236 -!2- sand filter (basic or large?) ~ sand filter, linear (basic or large?) --C.L sand filter vault (basic or large?) ~ stormwater wetland ---i2.- wetpond (basic or large?) ----'>-- wetvault D EXHIBIT. l, . KING COUNTY. WASHINGTON. SURFACE WATER DESIGN MANUAL DESIGN TOTAL INDIVIDUAL BASIN INFORMATION. cont'd Drainage basin(s) A B C D Onsite area ~.b 71d!. Offsite area \5: 01, 7t Tvoe of Stora2e Facility ~MR ~..!.., j.J (A: Live StoraJte Volume ~ '->Oq,n. J\ (A PredevelODed Runoff Rate 2-vear n~/ ?t 100year D." 0 -,/) lOO-year 0,- 7 0/ DevelOPed runoff rate 2-year '11 ~ !:::;\ 100year I~ ~\ lOO-year Z, ~ ::!7 Tvne of restrictor ;::\ Size of orifice/restriction No.1 ~1~11Td> -.-\ No.2 I. ~6 (Ilt -37/ No.3 - \ No.4 - I ~ FLOW CONTROL & WATER QUALITY FACll..ITY SUMMARY SHEET SKETCH All detention, infiltration and water quality facilities must include a sketch per the following criteria: 1. Heading for the drawings should be located at the top of the sketch (top right-hand comer). The heading should contain: · North arrow (point up or to left) · Plat name or short plat number · Date drawn (or updated) · 09#_ · Address (nearest) · Thomas Brothers page, grid number -- Label CBs and MHs with the plan and profile designation. Label the control structure in writing or abbreviate with C.S. Indicate which structures provide spill control. 3. Pipes- indicate: Pipe size Pipe length Flow direction Use s single heavyweight line 4. Tanks- use a double, heavyweight line and indicate size (diameter) 5. Access roads · Outline the limits of the road · Fill the outline with dots if the road is gravel. Label in writing if another surface. 6. Other Standard Symbols: · Bollards:.. . . .... · Rip rap 000000 000000 Fences -x-x--x--x-x-x_ · Ditches -0---0---0---0 7. Label trash racks in writing. I ? I ~38 ~'i1\t.... 8. Label all streets with the actual street sign designation. If you don't know the actual street name, consult the plat map. 9. Include easements and lot lines or tract limits when possible. 10, Arrange all the labeling or writing to read from left to right or from bottom to top with reference toa properly oriented heading. II. Indicate driveways or features that may impact access. maintenance or replacement. \, EXHIB!T PAGE l'lOF-IIl- ~4E ~Gc>a ~f= 19<oM ~TI::EJ... Llrkt: absT ~ r~CRP"~ CI~'O'~J:;' (' '/';~~ b.k>Z-Ite-., D.05 A-c- of "F('~ji2...~ ST wm It-b,Dl!..D (0 r7c>TH /EXLS(tNG ~ DEV~L-apF-o ~/J</5_ W/LL-!'vb, A-P,;~-<Zr ~~/oA.'NItF--J .. 911/98 ~W Ce)i'JTT<-bL- c.'+-l.C S. A-vVTffGW pac.. -;;'UI<VE'I, J 1998 Surface Water Design Manual ({6VtS/6;v 7D IviIL-fTltp..'f t<.t>, 5a 2 Rt6f1T-6F-W!t-'1. "'''''IlaI...__ - --....___..._ ~u ~!I _wv......... _ ~~ ":" j aun j.' AJr1I:)V:I IIUYMllllOlI ~ en . J.SIlI:) on 1DI.S .... .. - to/dill tv. 'tol " OJ. II IIlOltY'fnOIIo UIIU, ~Ill ..~~ --~ ~~1._;---- ----- mr.-==r.. IIiII S I!lll!lr.~u Of, f i~!~! i Ii ~J ~ HJ I Ii Ii Ii ~ ~.b ~IIR ~11t I 00. ihd m!! fin = ~ ~ t: JI :~~~ ~... ~ ~~;~ gllUI H d j" . ~ i if!;9 ~ ngg ~, i i ~ nn f iiiii l!i il !t.. f I h ~ CJ w~ J ~ Ui . I!! l!! .!l! Iii 0 I Ii 9 ~ il 'I i i ei ~f ~i ! I. IE .. I i SI ~t ~ l: cob ~ 1I1!fi fal ~ :!~!II !l! ,sm Q ! "'::~B GIll!!,,;!! ill ~ < 5 !!!! I ;:;;; ~ a.. 1I i!h ~ii m i!;I~ Id"b a !Ii uI ..., i~ _t; wi IL'" e; or>=- t; ~~ · ~ S!s c:J (.) j! ~. IoU _ iI. ~ >-~ :5!; ~. .... S!s;l . 1ft Ii ... ~ fa en II.... !~ S!sS I ac: 2 c ~ ~ I 0 , z ;. ... z~ < <8 E E ... CIC ~ co II ~ ~ N ~ <:0 ~ 238 I'M ~s:eo:r eo, z/c; 'l~C;-l]a '6MP'1~C; l]a-^]!J-99090\:lMa\99090\~OO~ Sp, pUOI\:~ I~ ~ H ! i aJ ~ o ~a i!:h a I " 31405 18th Ave. 50. m Federal Way Public Schools . . RECEIVED BY COMMUNITY DEVELOPMENT DEPARTMENT Federal Way, WA 98003-5433 Tel 253.945.2000 www.fwps.org January 31, 2008 FEB 0 1 2008 City of Federal Way Deb Barker Department of Community Development POBox 9718 Federal Way WA 98063-9718 Dr- [03Wr -~9fA RE: Steel Lake Crest 06-1 06494-PC Dear Ms. Barker, The Federal Way School District recently received information on Steel Lake Crest, a proposed 29-lot subdivision. The project is located east of 28th Ave S and north ofS 308th ST. Under current boundaries Wildwood Elementary, Sacajawea Middle School and Federal Way High School service areas. School service areas are reviewed each year and necessary boundary changes may be made to accommodate enrollment increases. Students living in this area receive school bus transportation to Wildwood Elementary and Sacajawea Middle School. Under current boundaries students would walk to Federal Way High. Bus stops are reviewed annually as student transportation needs change, The closest stop for Wildwood Elementary is on 28th Ave S at S 310th ST. The closest stop for Sacajawea Middle School is on 28th Ave S at S 311th ST. . Student safety must be considered for all students who would walk to the schools and to school bus stops from this development. Sidewalks and other planning features that assure safe walking conditions for students are factors the district must consider as we comment on development within our service areas. We ask the developer to prepare a "School Access Analysis" to the elementary, middle school and high school from this proposed development. Attached are guidelines for preparing this analysis. The most recent Federal Way School District Capital Facilities Plan indicates a student yield of .7060 from new single-family housing. This development could add 20 to 21 new students. These are averages only; the actual number of students may vary. This may create a need for additional space, equipment and staff. 'This impa\,;t is mitigated by the collection of impact fees. The District appreciates the opportunity to comment on this proposed development. Sincerely, /. /;;/ ',I J I ~ t/{/ J:IA/./-- ~ri Walker Enrollment Analyst c Sally McLean, Chief Financial Officer David Remman, Safety Officer Cindy Wendland, Transportation Director School Principals /EXHIBIT PAGE \ ~ OF ~ Steel Lake Crest. doc 239 School Access Analysis New development creates a need for analysis of student pedestrian safety. The Federal Way School District would prefer an analysis of walking paths to schools and bus stops from new subdivisions be prepared by the developer prior to final comments on impacts. Generally a walking route should be planned to assure that school-age pedestrians from a neighborhood: · Cross the fewest number of streets to reduce vehicle-pedestrian exposures · Walk on sidewalks or paths where available; · Walk the shortest possible distance on streets without sidewalks or wide shoulders; · Walk on the left side of the road facing traffic on streets where practicable; · Avoid high speed, high volume roads and roads with high truck volume. · Make maximwn use of protective techniques (traffic control devices, existing crossing guards and school patrols.) · Use easements with walkways through parks or other available areas where student safety is maximized. Walkways and paths must be cleared of vegetation for maximwn visibility. The analysis of walking paths to schools and school bus stop locations from a new subdivision should include the following information: . School location · Description of sidewalks, pedestrian paths and shoulders including: ~ condition and width of shoulder and sidewalks; ~ whether shoulders are paved, gravel or grass, or non-existent; ~ whether sidewalks and pathways are immediately aqjacent to the traffic lanes or are separated by a planting strip or other means from moving traffic; and ~ the location of drainage or irrigation ditches. · Location of all crosswalks, including type of crossing protection offered; · Medians, pedestrian refuge islands and other pedestrian safety features; · Posted speed limits and warning signs, especially all 20 mph school speed limit zones; . All stop and yield signs; · Traffic signals including presence of marked. crosswalks and pedestrian signal indication. Traffic signal timing and phasing for pedestrian crossing. · Major sight line obstructions as measured from the height of children. . Bicycle lanes or paths. · Other relevant pedestrian safety factors observed. EXHIBIT~ PAGE~OF ~ 240 -~ -- Schweikl & Associates, pile Civil Engineering, Project Management and Consulting 70S S. 9th St. Suite 303 Tacoma, WA 9&405 Phone: (253) 272-4451 Fax: (252) 2n-449S May 8, 2007 Geri Walker Federal Way Public Schools Educational Service Center 3 1405 18th Avenue South Federal Way, Washington 98003 Project: Steel Lake CreSt- File #06-106494-OO-PC at P~ject No.: 06066 RE: School Access Analysis Dear Ms. Walker, The following School Access Analysis pertains to the Steel Lake Crest PI~ File #06- 106494-00-PC, located at 30642 28th Avenue South. The purpose of this analysis is to provide a safe passage for the potential school-age pedestrians from the new development to the schools serving the area. Those schools are Wildwood Elementary School, located at 2405 South 300th Street, Sacajawea Junior High School, located at 1101 South Dash Point Road, and Federal Way High School, located at 3061l 16th Avenue South. School bus service is provided to Wildwood Elementary School and Sacajawea IWlior High School. The proposed Steel Lake Crest development is within the one mile walking radius of Federal Way High School, and no bus service will be offered. Therefore a safe walking route to Federal Way High School must be developed paying particular attention to already built sidewalks and safety. This letter is thus the developer's written response to satisfy the Federal Way School District's requirement for an analysis of walking paths to schools and bus stops from new subdivisions. In regard to a new development in the Federal Way School District area and the preference of walking paths to both bus stops and schools we have found a safe resolution. Establishing our starting point at 30642 28th Avenue South, directly in front of the develogment, we found the path to the bus stop at the comer of 28th Avenue South and South 310 Street for WIldwood Elementary School consisted of an asphalt road and 6 feet of additional asphalt for the shoulder extending from the white barrier line. The area is relatively flat and includes a drainage ditch at the edge of shoulder, which is present on the majority of the walk. This ditch averages ~ - I ~ ft. deep and is hidden while driveways and side roads cover it Various plants and fauna are present as well, overhanging the shoulder occasionally, but not likely to cause a problem. Similarly, the other concerned bus stop at 28th Avenue South and South 31lth Street rAlilQEWED EXHIBIT tJ JUl 1 6 2007 P.A~I= :\ OF ~06066"'~ ~l'r BUllt;)/NG O~'r~AY Sacajawea Junior High School haS similar attributes. The 6 feet of shoulder alQug th~ road is still present as well as the drainage ditch of 1 Y2 feet deep. On the other hand, when walking towards this bus stop you will encounter fewer branches overhanging the shoulder, but a lot more shrubbery off of it. Concernini a route for students walking to Federal Way High School, we have found that South 312 Street will be a safer route to walk to school then South 304th Street. When walking past the previous bus stops, south towards S 312th St, you will notice the same 6 foot asphalt shoulder and the same lY2 feet deep drainage ditch as mentioned before. As you encounter the intersection of S 312th St and 28th Ave S, you will find yourself at the Steel Lake Maintenance Facility, as its driveway is one of the roads of this intersection. This intersection is a 4,..way stop, consisting of stop signs in all directions, with sidewalks located on the southern part of 28th Ave S and one. that crosses S 312th St, each with a pedestrian warning sign. First, you must cross the entrance of the maintenance facility where there is no crosswalk and then you will find yourself at a 6 inch gutter sidewalk that's 7 feet wide stretching down 28th Ave S. There you must cross 28th Ave S using its associated crosswalk and end up traveling west on S 312th S1. There you will find that the shoulder is now 6 Y2 feet wide from the white gore stripe to the edge of the asphalt paving. There is another 7 Y2 feet of gravel and small branches to the left of shoulder before you will encounter a drainage ditch which ranges from 5 in. to 1 Y2 ft. in depth as it makes it's way downhill towards Pacific Highway South. At the Steel Lake Annex entrances, there are stop signs for the vehicular traffic associated to these roads, but no pedestrian crosswalks present as you must cross these to continue your way. Upon reaching the bottom of the hill you will approach a roadside barrier extending approximately 97 feet and constraining shrubbery and fauna which extends about another 200 feet after the barrier. Here the white barrier line turns into reflectors that are placed every 4 Y2 feet from each other. At that location a 6 inch high curb with a 12 foot wide sidewalk begins. The sidewalk has planted trees in it every 3-25 ft. along the curb side of it and is 6 feet from the reflector line. Next you will approach the intersection of S 312th St and 23rd Ave S. This is a 3-way intersection, is regulated with traffic lights, crosswalks on all roads and the reflector line stops. There you must cross 23M Ave S and the signal allows a fair amount of time to cross this street (about 10 sec.). This sidewalk consists of plants and trees laid out like the previous one, but they are now spaced every 10-35 ft. There is a fence 2 feet outside of the sidewalk with a rock ledge emerging at the edge of sidewalk raising the fence 3-2 feet as it diminishes upon arriving at the next intersection. The intersection of S 312th St and 20th Ave S is a 4-way intersection and is regulated with traffic lights, and crosswalks on all roads. This one however comes equipped to help the sight impaired with "beeps" and says what road you are going and which direction. This sidewalk continues the rock ledge for approximately 26 feet and continues with plants and trees in the same manner as the previous sidewalk. Then three, 20 foot long shade awnings have been built on the edge of the side walk. They are connected with a unique ground layout of concrete slabs. You must then cross a back entrance to Waf-mart to which there is a stop sign but no crosswalk and continue on your way towards the intersection with Pacific Highway South. EXHIBIT N 2 PAGE 1- OF ~IAnalYSis.doc 242 This intersection of Pacific Highway South and S 312th Street is very busy. It is a 4~way intersection, is regulated with traffic lights and also comes equipped with helping the sight impaired. You must cross Pacific Highway South, then heading north cross S 312th Street. Here you will find yourself on an 8 ft. wide curbed and guttered sidewalk with a 5 ft. wide planting strip of trees and grass. This continues for approximately 100 feet till you reach a parking lot entrance. There it changes to a 5 feet wide sidewalk stretching for about 110 feet and is roughly 12 feet from the white barrier line. Then, the sidewalk stops and you are 12 feet from the white barrier line right next to immediate parking extending about 70 feet. This then leads to an 8 feet wide curbed and guttered sidewalk with a 5 feet planter strip of ivy which is about 12 feet from the white barrier line and stretches about 100 feet. The sidewalk then stops and you are then left alone with 12 feet to the white barrier line and a gravel area about 70 feet long by 9 feet wide. This leads to a large 50 feet asphalt comer at Pacific Highway South and S 30Sth Street, the last intersection before the school This intersection is a 4-way, regulated with traffic lights, crosswalks on all roads, but is not equipped with sight impaired equipment. You then cross S 308th St and you will end up on Federal Way High School grounds and there is a concrete pathway leading directly to the school and its entrance. . The streets associated with this path have moderate to high density traffic on them, but this section of Pacific Highway South is commonly known as having very high levels. The posted speed limits of 3 12th Street and 28th Avenue are both 35 mph, on Pacific Highway South it is 45 mph. There are no bicycle lanes or any paths to help in safety in this route, any sight obstructions, or any other pedestrian safety features. ~JidO Brant A. Schweikl, P.E. Managing Member cc: Steel Lake Plat Group, Project Owners EXHIBIT ~ PAGE ~ OF~ 3 06066_SchooI Analysis.doc 243 @ King County Depl of Development and Environmental Services Building Services Division 900 Oakesdale A venue Southwest Renton, Washington 98055-1219 (206) 296-6600 ITY (206) 296-7217 This certificate provides the Seattle King County Department of Public Health and the Department of Development and Environmental Services with information necessary to evaluate development proposals. Alternative formats available upon request King County Certificate of Sewer Availability L -/J /j I 00 oot - · th;, """ number name o Building Pennit o Short Subdivision Jj( Preliminary Plat or PUD o Rezone or other C<. ""''''''''',.....~ ~I ~ f?l i# ~ Proposed use: Jt"'-bl~ act l",,~ ~~2- ~>h Av~ 7'> ~er~ ~ J\fN Q'1'~JDl+'1O'i{P..l t;tt;;I/O'l9-f'Ci, _ 'I )) - '5 /JfOVO,/r/l",j (attach ap and legal description if nace ary) Sewer agency information: 1. 0 a. Sewer servicedWbe provided by side sewer connection only to an existing size sewer feet from the site and the sewer system has the capacity to serve the proposed use. )( OR b. Sewer service will require an improvement to the sewer system of: / Jl[ (1) ;<., t:. feet of sewer trunk or lateral to reach the site; and/or tit' (2) The construction of a coil . 'on system on the site; and/or"/ 0(3) other (describe) 2. ]zf. a. OR 0 b. 3. )( a. OR 0 b. The sewer syst~m improvement is in conformance with a County approved sewer comprehensive plan~ The sewer system improvement will reqUire a sewer comprehensive plan amendment The proposed project is within the Corporate limits of the district or has been granted Boundary Review/' Board approval for extension of service outside the district or city. Annnexation or Boundary Review Board (BRB) approval will be necessary to provide service. 4. Service is subject to the following: a. Connection charge: T'O -e:6 r:A:LcU L.J\~ " ./ b. Easement(s): A.s ReQu I Ri=:=D . c. other: 'QEvF-l..UP~ E)c-re.J5l0"-J A.:(""~~..n- @:::Q~)\R.hD.'/ The District, at Its sole discretion, reserves the right to delay or deny sewer service bued upon capacity limitationsla District and Other Purveyor facilities. . I certify that the above sewer agency information is true. This certification shall be valid for one year from date of signature. sewer availability form.doc b-cert-sewer.pdf LAKEHAVEN UTILITY DISTRICT Agency name c:iAJh-e_. --rErH - -:u::c: Title 02-07-2002 @) King County RECEIVED Department of Development and Environmental Services Building Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 206-296-6600 TIY 206-296-7217 / ERU'S ;29 KING COUNTYCER1'IRCATE OF WATER AVAILABILITY JUL 1 6 2{}07 This certificate provides the Seattle King County Department of Public Health and the Department of Development and Environmental Services with intannation necessary to evaluate development proposals. r~DO not write in this box J - number name CITY OF FEOEAAl WAY BUlLOINQ DEPT, King County Certificate of Water Availability Alternative formats available upon request ~-o" o Building Permit o Short Subdivision y{ Preliminary Plat or PUD o Rezone or other Water purveyor information: 1. 0 a. Water c.ti' be providdd by service connection only to an existing that is feet from the site. (size) water main OR )Ii b. 2. "%-- a. OR 0 b. 3. j.'!!( a. OR 0 b. 4. % a. Water service wi" r~uire an .:lprovement to the water system of: Ill' (1) 15- h' feet of water main to reach the site; andlill!' Ill' (2) The construction of a distribution system on the site; and/or ..,.... ~(3) Other(describe)E)<.L'END "TO \4\Q. ~ IN I\cc...o~ ~lT\\: ~eN ~ClL.\.c:..'-{. ./ The water system is in conformance with a County approlled water comprehensive plan. 0./' The water system improvement is not in conformance with a County approved water comprehensive plan and wi" require a water comprehensive plan amendment. (This may cause a delay in issuance of a permit or approval). The proposed project is within the corporate limits of the district, or has been granted Boundary Review Board / approval for extension of service outside the district or city, or is within the County approved service area of a private water purveyor. Annexation or Boundary Review Board (BRB) approval will be necessary to provide service. Water is or will be available at the rate of flow and duration indicated below at no less than 20 psi measured at the nearest fire hydrant _ 5:!: feet from the building/property (or as marked on the attached map): Rate of flow at Peak Demand Duration o less than 500 gpm (approx. gpm) 0 less than 1 hour o 500 to 999 gpm 0 1 hour to 2 hours Jil1000 gpm or more .,/' Jit 2 hours or more -./' O~_of ~ O~ o calculation of gpm (Note: Commercial building permits which includes multifamily structures require flow test or calculation.) o OR b. Water system is not capable of providing fire flow. Water system has certificates of water right or water right claims sufficient to provide service./' 5. Ji( a. OR o b. Water system does not currently have necessary water rights or water right claims. ..,./ Comments/conditions: VE\lE\...OPlS<. ~~ See:::. N A:~ A-:lT' RE&'lI...JI ~. I certify that the above water purveyor infonnation is true. This certification shall be valid for one year from date of signature. LAKEHAVEN UTILITY DISTRICT 15\ZlA-N A::::'fg(jp-~ Agency name .rj,(? Signatory n7"~ eN~Q, L~g.UT ~dA___ 5h~07 Title Signature /1 ~ (/ 7 mr;-~:';';:T;;':'-;;;';';;;;;;;- ';;;;;'-;;;;;%?;;:;;W';;;T~':-~ ~~-~0 '. ~:;;::;;on-::::;::-;~~servb""" upon '. E)02fIB1T---R- capaclt}i limitations In Dist~Ict and Other PtJrv!lYo.~ f~~i1~ie~~ .P:AC~O~ ~_MADSKO~'mA1" nnsA~CIllmPICA1B YilIJ.BB~ RY 1l:iF. APPl.lC\Q lAND U!l8o\~ water availabmty form b-cert-water.pdf Rev. 05-19-2003 ~ Schweikl & Associates, pile Civil Engineering, Project Management and Consulting 705 S.9th St, Suite 303 Tacoma, WA 98405 Phone: (253) 2n-445' Fax: (252) 2n-4495 November 2, 2007 Mr. Raid Trihi, PE Public Works Traffic Division City of Federal Way 33325 8th Avenue South, PO Box 9718 Federal Way, Washington 98063 Project: Steel Lake Crest- File #06-106494-00-PC .. Project No.: 06066 RE: Sight Distance Survey Report - Revised Dear Raid, The following is a revised Sight Distance Report of the sight distance survey that was . performed for the proposed plat Steel Lake Crest in accordance with the Pre Application Conference Summary, dated February 6, 2007. The sight distance survey for the proposed plat was conducted on April 13, 2007. The initial survey found that there will be the required AASHTO entering sight distance available for three of the four entering site distance maneuvering conditions from the proposed two residential intersections with 28th Ave South. After considering several options including ~ducing the speed limit on 28th Ave South from 35 mph to 30 mph to bring the left turning movement from the proposed northerly access point into compliance and in lieu of comments from local citizens over concerns about the excessive speeds along the 28th Avenue South corridor the City agreed to one of the lesser desired alternatives. lIDs alternative is to remove the northerly street access and reconfigure the preliminary plat with only the one remaining ingress/egress point. lIDs alternative would also require a revised road modification request to allow the "W" Street section for that portion of the internal street where trips for all of the now 28 residential lots combine at the projects one access onto 28th Avenue South. This revised road modification was discussed and it was agreed that the "W" Street section could be retained for that portion of the access that has all 28 lots contributing to it. It was also agreed that there would be no parking allowed along either side of the street in that portion in deference to the traffic volumes and turning movements associated with ingressing and egressing on and off of 28th Avenue South from the proposed project. The revised road modification will also will also be resubmittal for consideraM~~ED ..D 7 - 1 03 8 9 7 NO V 0 2 2007 ~XHIBIT -L:~~D~ PAGE--L-OF ~~NG DEPT",!AY From the initial sight distance survey report the only maneuvering condition that did not meet the required distance was the southbound turning movement from the past proposed northern internal. plat road to 28th Avenue South. The line of site was interrupted vertically by the crest of the road profile of 28th Avenue South and fell approximately 40- feet short of meeting the AASHTO entering sight distance threshold. Also the northbound turning movement would have require the selective pruning of low bushes within the area of the public right-of-way to provide full visibility for a portion of the viewing field at the driver sight point at the northern internal road. The regular maintenance by the City road crews or selective pruning of the bushes within the public right-of-way will provide the necessary sight distance to beyond the AASHTO threshold and beyond. See the revised sight distance drawing, SD-l, that reflects the removal of the northerly access from the proposed preliminary plat of Steel Lake Crest. Therefore considering the above lack of compliance with the AASHTO entering site distance standards the project proponents will be proposing to remove the northerly access and provide half street improvements and associated shoulder tapers along our frontage. With the proposed half street improvements there are no associated improvements to any portion of the western. half of 28th Ave South right-of-way. The proposed improvements will retain the existing traveled lane widths for both the north and southbound lanes of 28th Avenue South and intend to keep the existing gore stripe in place to direct traffic to remain in the existing lane configuration and not utilize the proposed widening as a through lane since the improvements are of such a short length it would require drivers to perform unnecessary lane maneuvers and potentially increase the potential for traffic accidents related to these maneuvers at the high vehicle speeds being reported by City staff along this stretch of 28th Ave South. The proposal would include the removal of the gore stripe at the proposed intersection if it meets with the requirements of the City Traffic Engineer. Since the proposed project generated trips do not warrant a two way left turn lane (TWLT), one is not proposed for the frontage along 28th Ave South. It is also our understanding that there are proposed City of Federal Way intersection and signalization improvements that are planned for the 312th Street and 28th Avenue South intersection that will most likely require road widening and tapers along the eastern edge of 28th Avenue South. The design for the proposed intersection improvements were not available for- a detailed analysis of the impacts of the proposed improvements and the cumulative affects of both of the improvements along 28th Avenue South to include pertinent facts or a discussion of that proposed project's relationship to the Steel Lake Crest proposed improvements.. We have added the required Sight Distance photos to this report for your review. EXHIBIT Q PAGE 1, OF ~ 2 06066_Sight Distance_071102.doc 247 If you should have any questions or require any additional information please do not hesitate to contact me, BrantA. Schweikl, at (253) 272-4451, and I will make every effort to provide you with your request. Tj)~.gQj{) ~s~eikl, P.E. Managing Member cc: Steel Lake Plat Group, Project Owners EXHIBIT Q PAGE ~ OF ~ 3 06066_Sight Distabcc_071102.doc 248 ~ Federal Way CITY HAll 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway.com May 10, 2007 Mr. Brant Schweikl Schweikl & Associates, PLLC 70S 9th Street, Suite 303 Tacoma, WA 98405 RE: File #07-102S33-0O-SH; SHORELINE SUBSTANTIAL DEVELOPMENT PERMIT EXEMPTION Steel Lake Crest Preliminary Plat Dear Mr. SchweikI: This letter responds to your May 8; 2007 request, for a shoreline exemption to the proposed preliminary plat development. The site is located in the NE quarter of Section 9, Township21 North, Range 4 East, W.M., and consists of several tax parcels including Parcel No. 092104-9096, which is developed with an existing single-family residence. A small portion of the northwest comer of this parcel is mapped within 200 feet from Steel Lake, which is regulated as a shoreline of the state under Federal Way City Code (FWCC). Proposed plat improvements include roadway widening, installation of curb, gutter, sidewalk, utilities, landscaping, and grading on proposed lot #1 and on the adjoining right-of-way. Unless exempt, any work proposed within 200 feet of the shoreline of the lake requires that a Shoreline Substantial Development Permit be obtained from the City. Shoreline Exemptions City staff reviewed the WAC 173-27-040 for potential exemptions to the shoreline substantial development permit, and also consulted Sandra Lange, lead staff with the Shorelands and Environmental Assistance (SEA) Division, of the Washington State Department of Ecology regarding specific exemption interpretations. The proposed roadway improvement work is included under the normal maintenance section listing below, while grading work done within portions of proposed lot #1 is addressed under the valua!ion section. A shoreline exemption means that a development application would not require a shoreline substantial development permit, but must still comply with the SMP and the Shoreline Management Act. Normal Maintenance - According to your letter, e-mails, and the drawing submitted with the preapplication conference request, work anticipated within the presumed shoreline setback area consists of roadway widening and associated improvements of sidewalk, landscaping, and minor grading. In reviewing submitted information, staff notes that roadway improvements would widen the dimension of the improved right-of-way and add sidewalks where none presently exist, subsequently increasing the overall infrastructure footprint. In a May 7, 2007 e-mail, Sandra Lange with Department of Ecology noted that the roadway work could possibly be construed as a 'normal maintenance' exemption under WAC 173-27-040.2.b if the roadwork is done in the common method and the replacement is ~D: original roadway in size, shape, configuration, location, and external appearance. Further, she states "that JUL 1 6 2007 EXHIBIT '" -......~-FFeoeRALWAY , ~OF ~ culLDING DEPT. PAGE~ ..-L- 249 Mr. Schweikl May 10, 2007 Page 2 the definition of normal maintenance or repair includes broad enough language to cover circumstances where the work will not exactly replicate the development that existed before." The Public Works Department noted in the City's February 6,2007, preapflication conference summary letter that this project would be expected to construct improvements on 28 Avenue South to the City's planned roadway cross-sections, I consisting of a 44-root street with curb and gutter, six-foot planter strips with street trees and street lights, eight-foot sidewalks, in a 78-foot right-of-way. Assuming a symmetrical cross section, nine-foot ROW dedication and half street frontage improvements are required. Tapers and transitions beyond the project frontage may be required as deemed necessary for safety purposes. The 28th Avenue South roadway improvement would be parallel to the existing roadway, and would be consistent in external appearance, shape, and configuration. Installation of curbing, gutter, sidewalk and utility strip improvements increase the right-of-way footprint, yet are the common method for modem roadway improvements. Further, these improvements would be landward of the existing roadway. Based on these factors, street improvements that are required for this proposed subdivision, consisting but not limited to installation of curb, gutter, planter strip with street trees, utilities and roadway widening located within existing and future portions of the 28th Avenue South right-of-way that are located within the 200- foot setback from the Steel Lake shoreline will be considered to meet the definition of normal maintenance, and therefore will be exempt from the Shoreline Substantial Development Permit requirements, subject to the following condition:2 1. Off-site roadway restoration shall include the planting of shrubs and ground covers to eliminate erosion potential. I1ydro~eeding alotle will not be acceptable. Project Valuation - Any work that is not defined as normal maintenance, that is conducted within the 200-foot shoreline area, and does not exceed $5,000.00 in construction costs may be considered exempt from Shoreline Substantial Development Permits per WAC 173-27 -04O(2)(a). According to the topographic map submitted with the preapplication conference, the northwest comer of proposed lot #1 contains slopes in excess of 40 percent. This area is also located within 200 feet of the shoreline area. Your April 20, 2007 e-mail, indicated that there would be 20 cubic yards of on-site grading and you assigned a value of $70.00 to grading associated with this area. Grading on lot #1 would not be considered normal maintenance. However, as the grading does not exceed $5,000.00, it will be exempt from Shoreline Substantial Development Permit requirements. Be advised that any proposed grading activities still require subdivision and engineering review. SUMMARY Pursuant to the State Shoreline Management Act and the City of Federal Way Shoreline Master Program, the roadway and grading work associated with the preliminary plat that is located within 200 feet of the Steel Lake shoreline is exempt from the $horeIine Substantial Development Permit process requirements and is exempt from the requirements of a Shoreline Substantial Development Permit as the work is classified as both "normal maintenance and repair" and "development of which the total cost does not exceed $5,000.00" per Washington Adminir~y rv:~C) sections 173-27-040(0) and 173-27- 040(b). The work is located within 200 feet irror Lake nd is consistent with policies of the I Emphasis added. 2 Under WAC I 73-27 -O40( I )( e), local governments may attach conditions to the approval of exempted developments and/or uses to ensure that the project is consistent with the Shoreline Management Act. EXHIBlcl> 40842 .p- PAGE ~ OF_'- 01.102533 250 Mr. Schweikl May 10, 2007 Page 3 Washington State Shoreline Management Act and guidelines of the City of Federal Way Shoreline Master Program f'Or existing conditions. Pursuant to FWCC Section 2-182, you may appeal this decision to King County Superior Court within fourteen days of the date of this decision. Contact the Washington State Department of Wildlife regarding a Hydraulics Pemrit Approval and relevant permits prior to commencement of any construction related to this exemption. Preliminary plat review will commence upon submittal of requited documents and application fees. If you have any further questions, please contact Deb Barker, Senior Planner, at 253-835-2642. Sincerely, ~~&~ Department of Community Development Services c: Sandra Lange, SEA Program, NWRO, Washington State Department of Ecology, 3190 160m Avenue SE, Bel1evue, WA 98008-5452 Allan Woida, 30614 28th Avenue South, Federal Way, WA 98003 Linda Elder, Steel Lake Plat Group, 30642 28th Avenue South, Federal Way, WA 98003 Deb Barker, Senior Planner Sean Wells, Senior Public Works Engineer Interpretation notebook 07-102533 EXHI~T~ PAGE ~ _o~-I.. 251 ORIGINAL FILE COpy .~ Schweikl & Associates, pllc Civil Engineering, Project Management and Consulting 705 5. 9th 51; Suite 303 Tacoma, WA 9840S Phone: (253) 272-445 I Fax: (252) 272-4495 May 8, 2007 Director of Community Development Services City of Federal Way 33325 8th Avenue South, PO Box 9718 Federal Way, Washington 98063 Project: Steel Lake Crest- File #06-1 06494-00-PC Md Project No.: 06066 RE: Shoreline Exemption Request Dear Director, The following Shoreline Exemption Request pertains to the Steel Lake Crest Plat, File #06-106494-00-PC, located at 30642 28th Avenue South. The purpose of this request is to obtain an exemption from the shoreline substantial development permit being required by the City of Federal Way for the Steel Lake Crest preliminary plat application. This letter is thus the written formal request seeking this exemption. The. cities basis' for requiring this permit, as defined under Federal Way City Code (FWCC) section 18-162, is that a portion of the proposed project falls within 200 feet of the shoreline of Steel Lake, a regulated lake. The applicant claims that the actual area affected by the mapped shoreline region is so minimal, and the impacts so insignificant that they are below the scope of substantial development intended by the Shoreline Management Act. Prededication, the on-site area within the boundary is only 289 square feet. This total shrinks to 103 square feet after dedication, with over 90% of that ending up in a landscape buffer. Off-site area, all within the 28th Avenue South right-of-way is 671 square feet. Approximately 200 square feet of the off-site area will be in a planter strip and 400 square feet (44 Square yards) will be pavement. The applicant believes these small numbers don't warrant the added expense and complexity that providing a shoreline substantial development permit would add to the project. In summary the applicant would ask that the Director please review this exemption request carefully. Also that he would consider what the real impacts would be of requiring a shoreline permit for this project and if this is consistent with the true scope and intent of the Shoreline Management Act. The applicant feels justified in asking for this modification and is confident upon examination of the circumstances that the director EXHIBIT .s IPAGE~OF ~_shorelineMod.doc 252 will grant its approval. If you detennine it would assist you to meet with the project owners and/or myself, we would be willing to gladly arrange for that at your conver!ience. If you should have any questions or require any additional information please do not hesitate to contact me, Brant A. Schweikl, at (253) 272-4451, and I will make every effort to provide you with your request. Respectively, Brant A. Schweikl, P.E. Managing Member cc: Steel Lake Plat Group, Project Owners EXHIBIT S PAGE. .~ OF ~ 2 06066 _Shoreline Mod.doc 253 -..