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18-100788
CITY OF 011'k Federal Way Centered on Opportunity November 21, 2018 Mr. Dan Balmelli Barghausen Consulting Engineers, Inc. 18215 72"d Avenue South Kent, WA 98032 CITY HALL 33325 8th Avenue South Federal Way, WA 98003-6325 (253) 835-7000 www. cityoffederalway, com Jim Ferrell, Mayor dbalmelli@barghausen.com Re: File #18-100788-00-UP (18-100791-SE); PROCESS HI `PROJECT APPROVAL' Panattoni/ Federal Way Tilt -Up, 351" and Pacific Hwy. So., Federal Way Dear Mr. Balmelli: The Community Development Department has completed administrative land use review of the proposed Tilt -Up project located at 1019 351" Street SW. The applicant proposes construction of a 79,000 +/- square foot industrial/warehouse building and associated site improvements to support Computer Numerical Control Machining Shop for Aerospace Parts, a company that manufactures machined metal projects to be utilized by regional and national aerospace companies. Site improvements include right-of- way improvements, utilities, stonnwater, landscaping, and parking stalls. Minor unavoidable impacts to the on -site wetland and stream buffer are proposed as part of development of the site, leading the applicant to also propose an administrative variance to the required front yard setbacks. The Process III Master Land Use (MLU) application submitted February 21, 2018, and subsequent resubmittals dated June 8, 2018, August 30, 2018, October 17, 2018, November 7, 2018, and November 8, 2018, is hereby conditionally approved based on the enclosed findings of fact, incorporated into this decision in full, and the following conclusions based on those facts: 1. The proposal is consistent with the comprehensive plan; 2. The proposal is consistent with all applicable provisions of the Federal Way Revised Code (FWRC) including decisional criteria found in FWRC 19.145.440 `Development within wetland buffers,' FWRC 19.145.330 `Intrusion into stream buffers,' and 19.45 `Variances;' 3. The proposal is consistent with the public health, safety, and welfare; 4. The streets and utilities in the area of the subject property are adequate to serve the anticipated demand from the proposal; 5. The proposed access to the subject property is at the optimal location and configuration; and 6. Traffic safety impacts for all modes of transportation, both on and off site, are adequately mitigated. The remainder of this letter outlines the land use review process required for this particular site improvement; summarizes the State Environmental Policy Act (SEPA) process; summarizes conditions of the land use decision; and provides other procedural information. This land use decision does not authorize initiation of construction activities. REVIEW PROCESS — The site is within the Commercial Enterprise (CE) zoning district. A manufacturing and warehouse/distribution facility with associated offices is permitted in this zone subject to the provisions of Mr. Balmelli November 21, 2018 Page 2 FWRC 19.240.010, 19.240.020, and 19.240.080, respectively. The proposed use, not exempt from SEPA, is reviewed under Use Process III, Project Approval. The proposed wetland and stream buffer intrusions and buffer averaging is reviewed under Use Process III pursuant to decision criteria found in FWRC 19.145.440(6), 19.145.330, and 19.145.440(5), and incorporated into this decision. The proposed variance that does not exceed 25 percent of the measurable standard, in this case 5 feet, is reviewed as an Administrative Variance under Use Process III pursuant to decision criteria found in FWRC 19.45.030, and incorporated into this decision. ENVIRONMENTAL DETERMINATION Following review of the environmental checklist submitted with the application and with conditions of land use approval, the City determined the proposal would not have a probable significant adverse impact on the environment, and issued a Determination of Nonsignificance (DNS) on October 19, 2018, pursuant to Washington Adn7inistrative Code 197-111350. The determination was noticed to the public on October 19, 2018, and appeals to the determination are due November 26, 2018. One comment was received from the Washington State Department of Health. CONDITIONS OF APPROVAL The following conditions are reasonably necessary to eliminate or minimize undesirable effects of granting application approval and are authorized pursuant to FWRC 19.65.100(3), "Conditions and Restrictions." Prior to issuance of a building permit, a revised landscape plan is required depicting the buffer enhancement planting, minimum landscaping requirements per FWRC 19.125.060(9), plant species, size, quantities, spacing, and interior parking lot landscaping areas and calculations. A landscape modification request may be submitted pursuant to FWRC 19.125.100. 2. Prior to issuance of a building pennit, the final landscaping plan must depict a minimum three- foot landscaped setback at the base of the retaining wall. If the retaining wall(s) are visible from public right-of-way or adjacent property, the construction plans shall depict wall materials as those composed of rock, brick or other textured/patterned wall styles to be approved by the Community Development Director. 3. Prior to issuance of a building permit, all proposed rockeries and/or retaining walls, including those associated with the underground detention vault and stormwater pond, must be depicted on the site/civil plans and must comply with FWRC 19.120.120. 4. Prior to issuance of a building permit, the applicant must submit and receive final approval of a groundwater monitoring plan to monitor quality and quantity of groundwater, surface water runoff, and/or site soils. 5. Prior to issuance of the building permit, all of the recommendations in the Perteet Memo, dated November 19, 2018, must be met. 6. Prior to building permit issuance, a final Community Design Guideline review will be conducted for compliance with FWRC 19.115 "Community Design Guidelines" (in particular FWRC 19.115.090(3) Commercial Enterprise (CE) zone district design guidelines). 18-100788-00-UP Doc, 1,D 78437 Mr. Balmelli November 21, 2018 Page 3 7. Prior to issuance of a building permit, a final Technical Information Report and construction plans shall be submitted for Public Works Department review and approval. 8. Prior to issuance of a building permit, the transportation impact fees must be paid. Transportation impact fees will be calculated based on the fee schedule in effect at the time a building permit application is filed. 9. Prior to issuance of a building permit, the planned shared -use paved trail must be constructed, or a written request to the Public Works Director to modify, defer, or waive the required street improvements must be submitted. 10. Prior to issuance of a building permit, the applicant shall consult with representatives of Waste Management and provide written evidence that the project site design meets Waste Management's minimum standards. 11. Prior to conducting forest practices on the site, the City must issue the submitted Class IV General Forest Practice Application. 12. Prior to issuance of a certificate of occupancy, the applicant must record with King County Recorder's Office, a restrictive covenant prepared by the City. The covenant will state that no land surface modification may take place and no structure or improvement may be located in the Type F Stream Buffer and Category I, West Hylebos Buffer unless authorized by the City. The final critical area site plan, including Critical Aquifer Recharge Areas, shall be included as an Exhibit. 13. Prior to issuance of a certificate of occupancy, the applicant shall submit a boundary line adjustment to the Community Development Department, receive approval, and record the approved drawing with the King County Recorder's Office. 14. Prior to issuance of a certificate of occupancy, a final wetland and stream buffer enhancement bond sheet shall be submitted -with the building permit. The performance bond sheet shall be reviewed and approved by the city's consultant, Perteet. 15. Prior to, and for the duration of, construction activity, the applicant must install temporary construction fencing containing silt screening fabric. A preconstruction inspection by the Planning Division is required to verify the silt fencing is installed per the final Stream Buffer Intrusion/Wetland Buffer Reduction Plan. Please contact the assigned project planner for final inspection. BUILDING PERMIT REQUIRED This Process III land use decision does not constitute a building permit, or authorize clearing/grading activities. Additional requirements will be provided as city departments review the building permits submitted for the proposed development. The applicant is recommended to review the Commercial Building Permit Checklist to ensure that all of the required information and documents are supplied to submit a complete building permit application for a project involving construction of a new commercial building. Please note, incomplete applications will not be accepted. Once missing checklist items are gathered, a new intake appointment will be required. 18-100788-00-UP Doc, I D_ 78437 Mr. Balmelli November 21, 2018 Page 4 INTAKE APPOINTMENT Appointments are required for intake of new commercial building permit submittals. Please schedule an intake appointment with the Permit Center staff at permitcenter@cityoffederalway.com, or (253) 835-2607. REQUESTS FOR CHANGE OF VALUATION Any affected property owners may request a change in valuation for property tax purposes, notwithstanding any program of revaluation. APPROVAL DURATION Unless modified or appealed, the Process III decision is valid for five years from the date of issuance of the decision. Time extensions to the decision may be requested prior to the lapse of approval following the provisions listed in FWRC 19.15.110. The improvements must be substantially completed within the five-year time period or the land use decision becomes void. APPEALS The effective date of this decision is December 7, 2018, or 15 days from the Notice of Impending Decision. Pursuant to FWRC 19.65.120, this land use decision may be appealed by any person who submitted written comments or any person who has specifically requested a copy of the decision. Any appeal must be in the fonn of a letter delivered to the Community Development Department with the established fee and within 14 days after the effective date of this decision, or December 21, 2018. The appeal letter must contain a clear reference to the matter being appealed and a statement of the factual findings and conclusion of the director disputed by the person filing the appeal. The Federal Way Hearing Examiner will hear any appeals of the Process III decision. CLOSING This land use decision does not waive compliance with future City of Federal Way codes, policies, and standards relating to this development. If you have any questions regarding this decision, please contact Robert "Doc" Hansen at 253-835-2643, or robert.hansen@cityoffederalway.com. Sincerely, rx 6L6:X, Brian Davis Community Development Director enc: Panattoni Development Commercial Checklist Approved Site Plan Master Land Use Application c: Brian Davis, Community Development Director, via email Tim Johnson, Economic Development Director, via email Robert`Doc' Hansen, Planning Manager, via email Becky Chapin, Senior Planner Ann Dower, Senior Engineering Plans Reviewer Chris Cahan, South King Fire & Rescue, emailed Brian Asbury, Lakehaven Water and Sewer District, emailed Brian Mattson, Panattoni Development, BMattson@,panattoni.com Betsy Dyer, Barghausen, bd er bar hausen.com Jon Pickett, Soundview Consultants, ions Jq soundvicwconsultants.cons Exhibit `A' Finding for Project Approval BLA Application 18-100788-00-UP Doc. I.D. 78437 -Z &S, CITY OF I�_deral Way Exhibit A \` J @ FV Findings for Project Approval Federal Way Revised Code (FWRC) Chapter 19.65, "Process III Project Approval" Federal Way Tilt -Up Development (Panattoni Development), File #18-100788-00-UP The Director of Community Development hereby makes the following findings pursuant to content requirements of the Process III written decision as set forth in Federal Way Revised Code (FWRC) 19.65.100(4). Proposal — Construction of a 79,000 +/- square foot, 2-story, industrial/warehouse building and associated site improvements to support the manufacturing of machined metal products to be utilized by regional and national aerospace companies. Site improvements include right-of-way improvements, utilities, stormwater, landscaping, and parking stalls. Minor unavoidable impacts to the on -site wetland and stream buffer are proposed as part of development of the site. Project Site — The subject property is approximately 16.18 acres located at 1019 South 3515Y Street, parcel #202104-9027. The existing site is mainly moderate to steep slopes with dense forest of mixed conifers and deciduous trees. There is an asphalt road onto the property that serves as access to the central parcel that is owned by Lakehaven Water & Sewer District. There is a stream and wetland on site. Over 65 percent of the site is encumbered by a critical area and associated buffers/setbacks. Zoning and Comprehensive Plan Designation — Zoning for the subject property is Commercial Enterprise (CE). A manufacturing and warehouse/distribution facility are permitted uses in the CE zone pursuant to FWRC 19.240.010 and 19.240.020, respectively. There is also a small amount of accessory office space within the building which is allowed per FWRC 19.240.080. ,The Federal Way Comprehensive Plan (FWCP) designation for the subject property is Commercial Enterprise. 4. Site Plan Review Process — Pursuant to FWRC 19.240.010 and 19.240.020, the required review process for the proposed warehouse/manufacturing facility, not exempt from SEPA, is Use Process I1I, Project Approval, as set forth in FWRC Chapter 19.65. The proposed wetland and stream buffer intrusions and buffer averaging is reviewed under Use Process III pursuant to decision criteria found in FWRC 19.145.440(6), 19.145.330, and 19.145.440(5), respectively, and incorporated into this decision. The applicant has requested a variance to the CE zone 20-foot required front yard setback to reduce the setback to 15 feet. A variance that does not exceed 25 percent of the measurable standard, in this case 5 feet, is reviewed as an Administrative Variance under Use Process III pursuant to decision criteria found in FWRC 19.45.030, and incorporated into this decision. 5. State Environmental Policy Act (SEPA) — The proposed improvements exceed categorical exemption levels pursuant to Washington Administrative Code (WAC) 197-11-800. The city acted as lead agency and issued a Determination of Nonsignificance on October 19, 2018. The threshold determination comment period ended November 2, 2018, and appeal period ends November 26, 2018; if no appeal is received, the determination will become final. 6. Public Notice — Pursuant to Process III regulations, a Notice of Land Use Application (NOA) was published in the Federal Way Mirror, mailed to property owners within 300 feet, posted on the subject property, sent to agencies, and displayed on the designated city notice boards on March 30, 2018. No written comments were received on the NOA. Pursuant to SEPA regulations, a Notice of Detennination of Nonsignificance (DNS) was published in the Federal Way Mirror, mailed to property owners within 300 feet, posted on the subject property, sent to agencies, and displayed on the designated city notice boards October 19, 2018. One written comment from Washington State Department of Health was received on the DNS. Pursuant to FWRC 19.45.015(2), an additional notice of impending decision is required for the Administrative Variance request. The Notice of Impending Decision will be published in the Federal Way Mirror, mailed to property owners within 300 feet, posted on the subject property, and displayed on the designated city notice boards on November 23, 2018. The comment period will end December 7, 2018, at which time the Use Process III decision will become effective. 7. Boundary Line Adjustment — A warehouse/distribution facility in the CE zone may not be located on property that adjoins a low to medium density residential zone; Suburban Estates (SE) and Single -Family Residential (RS35) are adjacent to the subject property. A Boundary Line Adjustment (BLA) pursuant to FWRC Chapter 18.10, is required to be submitted to create separation between the subject property and the low to medium density residential parcels. Prior to issuance of the building permit, an approved BLA must be recorded at King County Records by the applicant. 8. Critical Areas — The city's critical areas map indicates the property is within a 6-month and 1 year critical aquifer recharge area capture zone, wetland, stream, and associated buffers/setbacks. Critical Aquifer Recharge Area - As required by FWRC 19.145.090, the applicant submitted a hazardous materials inventory statement as a component of the MLU application. The applicant has indicated that no hazardous materials or deleterious substances will be stored, handled, treated, used, produced, recycled, or disposed on site. As part of the SEPA DNS comment period one comment was received from Deborah Johnson, Wellhead Protection Specialist with Washington State Department of Health, Environmental Public Health Division. A groundwater monitoring plan is required to monitor quality and quantity of groundwater, surface water runoff, and/or site soils. The plan/study may be reviewed by the city's third party consultant at the applicant's expense. Wetland and Stream Buffer Intrusions — The applicant has proposed intrusions within an identified Category I wetland buffer. Category I wetlands with habitat scores of seven (7) points requires a 190-foot buffer. Intrusions within an identified Type F stream buffer are proposed. The Type F stream requires a 100-foot buffer. In addition, building and other structures requires a 5-foot setback from the regulated wetland/stream buffer edge. The applicant submitted a Wetland and Fish and Wildlife Habitat Assessment, prepared by Sound -view Consultants, dated February 2018, with the Use Process III a-pli--cation.As proposed, the project included careful site planning in order to avoid direct impacts to all on -site critical areas; Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc. LD. 78436 Findings for Project Approval Page 2 however, due to site constraints and regulated hydrological features and in order to adequately address stormwater, public safety measures, and fire access requirements, some impacts to the wetland and stream buffer is necessary to allow reasonable development on the subject property. To develop the site the applicant proposes a 25 percent wetland buffer reduction. The city's wetland consultant, Perteet, peer reviewed the above -mentioned report. Perteet prepared a technical memorandum on April 16, 2018, which included deficiencies and required the applicant to address several comments. Soundview Consultants submitted revised reports/technical memorandums on June 8, 2018, August 30, 2018, and November 8, 2018. The applicant proposed to reduce the building as much as feasibly possible and submitted an administrative variance to reduce the front yard setback by 5 feet to reduce impacts to the buffers. The wetland buffer reduction is necessary to allow construction of stormwater detention and treatment facilities. Stormwater will be treated and controlled to current standards before being discharged into the outer 25 percent of the wetland buffer. Any other minor wetland buffer intrusions that may come up during final project design will be reviewed and approved prior to building permit issuance. The stream buffer intrusion is proposed in an area already impacted to some extent. The existing buffer associated with the stream is highly degraded with anthropogenic disturbances, a maintained utility easement, and invasive plant species. The proposed intrusion is necessary in order to provide safe vehicle access, required fire access and truck turning, and slope stability. Perteet provided a second review memo on November 19, 2018, attached. The findings discussed in the memo must be addressed during review of the building permit application. Any unforeseen impacts to the critical area buffers, as a result of design review changes, will be reviewed by Perteet. Per FWRC 19.145.170, upon city approval of the final Wetland and Fish and Wildlife Habitat Assessment Report, the owner must file a notice, approved by the city, with King County recorder's office. The notice shall inform the public of the presence of critical areas, buffers or mitigation sites on the property, and that limitations on actions in or affecting such critical areas or buffers may exist. Pursuant to FWRC 19.145.440(6), Buffer reduction with enhancement, buffers may be reduced by up to 25 percent if the project includes a buffer enhancement plan that clearly substantiates that an enhanced buffer will improve and provide additional protection of wetland functions and values. The Director has determined the proposed wetland buffer intrusion requested for the stormwater structure and buffer enhancement plan, with conditions, meets intrusion criteria per FWRC 19.145.440(6) as analyzed below: a) It will not adversely affect water quality; Stormwater runoff from impervious surfaces of the proposed project will be conveyed to water quality treatment ponds and vaults to be detained and treated prior to release into the outer 25 percent of the Wetland A buffer through an outfall with energy dispersion. As the existing site currently does not have stormwater detention and treatment facilities and has a significant presence of anthropologic disturbances onsite draining untreated into the stream, it is anticipated the proposed project will benefit water quality onsite. The water which flows from the east side of the subject property into Stream Z and Wetland A is contaminated with degradations which the proposed project will remove; therefore, the proposed project will not adversely affect water quality and will benefit water quality. Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc. I.D. 78436 Findings for Project Approval Page 3 b) It will not adversely affect the existing quality of the wetland's or buffer's wildlife habitat; No adverse effects to habitat are anticipated within the buffer or adjacent wetland. As the existing buffer to Wetland A is severely degraded with anthropogenic disturbance waste and debris, and a significant presence of non-native, invasive vegetation, the proposed buffer enhancement actions will remove such disturbances and degradations that when coupled with project design elements such as treated stormwater, buffer restoration and enhancement, and utilization of a reinforced earthen slope that will be planted with native riparian vegetation, is anticipated to provide a net gain in ecological lift of buffer functions compared to the current baseline. Further, the proposed buffer enhancement plan will replant the remaining stream buffer with native plants which will provide a diverse vertical and horizontal vegetation strata beneficial to wildlife and a much improved habitat to better protect habitat functions. c) It will not adversely affect drainage or stormwater retention capabilities; The portion of the site which is proposed to be developed slopes west to Wetland A and Stream Z and has little stormwater retention capability. No stormwater treatment or detention facilities are onsite, and as such, stormwater currently flows unimpeded downslope through anthropologic disturbances onsite into the Wetland A and Stream Z untreated and undetained. Stormwater runoff from new impervious surfaces of the proposed project will be conveyed to stormwater ponds and vaults to be detained and treated prior to release into the outer buffer of Wetland A through an outfall with energy dispersion. As the existing site currently does not have stormwater detention and treatment facilities and has a significant amount of garbage, debris and anthropologic disturbances onsite, it is anticipated the proposed project will benefit water quality, drainage and stormwater detention capabilities onsite with the proposed enhancement actions and stormwater facilities. d) It will not lead to unstable earth conditions nor create erosion hazards; All appropriate erosion control and best management practices will be used to prevent unstable conditions. Runoff will be detained and released through a dispersion trench to dissipate discharge flow velocities. The proposed project has been designed with specific erosion prevention and stabilization elements to avoid the creation of unstable earth conditions and erosion hazards. The project will utilize a reinforced earthen slope that will be planted with native riparian vegetation to prevent erosion. The developed site will stabilize once all proposed landscaping matures are completed. The entirety of the reduced buffer will be stabilized and replanted with native seed mix, shrubs and trees. e) It will not be materially detrimental to any other property nor to the city as a whole; As the existing buffer to Wetland A is severely degraded with anthropologic disturbances, waste and debris, and a significant presence of non-native, invasive vegetation, the proposed actions to remove such disturbances and degradations coupled with project design elements such as treated stormwater facilities and buffer restoration actions are anticipated to provide a net gain and ecological lift for the wetland and buffer. This improvement will not be materially detrimental to other properties or the City of Federal Way and should benefit the facilities and buffer restoration actions as awhole. Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc. ID. 78436 Findings for Project Approval Page 4 f) All exposed areas are stabilized with native vegetation, as appropriate. The reduced wetland buffer will be enhanced and replanted with native plantings. The existing buffer to Wetland A is severely degraded and has several open and exposed areas, waste and debris, and a significant presence of non-native, invasive vegetation; all buffer degradations will be removed and replanted with native plantings. Pursuant to FWRC 19.145.330, Intrusions into stream buffers, stream buffer intrusions may be permitted with a buffer enhancement plan. Further, after discussion with city staff, the stream intrusion will be reviewed pursuant to FWRC 19.145.440(5), Buffer averaging. The Director has determined the proposed stream buffer intrusion requested for the proposed vehicle access, required fire access and truck turning, and slope stability, with conditions, meets the intrusion into stream buffer and buffer averaging criteria per FWRC 19.145.330 and 19.145.440(5), respectively, as analyzed below: a) It will not adversely affect water quality; Stormwater runoff from impervious surfaces of the proposed project will be conveyed to water quality treatment ponds and vaults to be detained and treated prior to release into the outer 25 percent of the Wetland A through an outfall with energy dispersion. As no water quality treatment or detention facilities currently exist onsite, and the existing buffer is severely degraded due, the proposed project will benefit water quality onsite as currently the water which flows from the east side of the subject property into Stream Z and Wetland A is contaminated with the degradations which the propose project will remove. Further, the proposed project will mitigate the associated stream buffer with enhancement of the remaining buffer through native plants, cleanup of the degradation and utilization of a permeable reinforced earthen slope; therefore, the proposed project will not adversely affect water quality and will benefit water quality. This net gain in water quality function would not be possible without the stream buffer intrusion, and enhancement/mitigation is not required by code and is only being proposed mitigation for the stream buffer intrusions. b) It will not adversely affect the existing quality of wildlife habitat within the stream or buffer area; As the existing buffer to Stream Z is severely degraded with anthropologic disturbances, patches of bare ground, waste and debris, and the significant presence of non-native, invasive vegetation, the proposed buffer enhancement actions will remove such disturbances and degradations that when coupled with project design elements such as treated stormwater, buffer restoration and enhancement with native riparian vegetation, such actions are anticipated to provide a net gain in ecological lift and improvement in stream buffer functions. Further, the proposed buffer enhancement plan will replant the remaining stream buffer with native plants which will provide a diverse vertical and horizontal vegetation strata beneficial to wildlife and a much improved habitat to better protect habitat functions. This net ecological gain in habitat function is proposed as mitigation for the intrusion and would not be possible without the stream buffer intrusion. c) It will not adversely affect drainage or stormwater retention capabilities; The _portion of the site which is.proposed to be developed slopes west to Stream Z and has little stormwater retention capability. No stormwater treatment or detention facilities are Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc. LD. 78436 Findings for Project Approval Page 5 onsite, and as such, stormwater currently flows unimpeded downslope through anthropologic disturbances currently onsite into Stream Z untreated. Stormwater runoff from new impervious surfaces of the proposed project will be conveyed to stormwater ponds and vaults to be detained and treated prior to release into the outer buffer of Wetland A through an outfall with energy dispersion. As the existing site currently does not have stormwater detention and treatment facilities and has a significant amount of anthropologic disturbances onsite, it is anticipated the proposed project will benefit water quality, drainage and stormwater detention capabilities onsite with the proposed enhancement actions and stormwater facilities. d) It will not lead to unstable earth conditions nor create erosion hazards; All appropriate erosion control and best management practices will be used to prevent unstable conditions. Runoff will be detained a released through a dispersion trench to dissipate discharge flow velocities. The proposed project has been designed with specific erosion prevention and stabilization elements to avoid the creation of unstable earth conditions and erosion hazards. The project will utilize a reinforced earthen slope that will be planted with native riparian vegetation to prevent erosion. The entirety of the reduced buffer will be stabilized and replanted with native seed mix, shrubs and trees. e) It will not be materially detrimental to any other property or the city as a whole; As the existing buffer to Stream Z is severely degraded, the proposed actions to remove such disturbances and degradations coupled with project design elements such as treated stormwater facilities and buffer restoration actions are anticipated to provide a net gain and ecological lift for the wetland and buffer. This improvement will not be materially detrimental to other property or the City of Federal Way and should benefit the city as a whole. f) It is necessary for reasonable development of the subject property. Development of the site is necessary for the applicant to manufacture aerospace components near Interstate 5 and centrally located within the Puget Sound. The proposed building construction is location dependent to the site which is centrally located between Seattle and Tacoma near Interstate 5 with connection to a major thoroughfare (Pacific Highway), necessary for the applicant to ship the machined metal parts to aerospace companies throughout the greater Pacific Northwest and beyond, with the Applicant's planned market expansion. The Applicant requires the minimum proposed paved yard storage for recycled material storage in large 40-yard containers, as well as material and shipping containers. The paved yard storage is also required for receiving large machinery to allow assembly and rigging of equipment. The Applicant cannot reduce other paved areas due to numerous site encumbrances beyond the proposed parking fire access and public safety requirements. All parking stalls have been removed from the stream buffer intrusion area to further lessen indirect impacts. This project requires a minor intrusion into the outer portion of Stream Z's buffer in order to develop the site and provide safe vehicle access, required fire access and truck turning, and slope stability. In addition, per FWRC 19.145.440(5), development within the buffer, buffer averaging is allowed if the project meets the fallowing: Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Dor. LD.78436 Findings for Project Approval Page 6 ^1' a) The total area of the buffer after averaging is equal to the area required without averaging; The proposed stream buffer intrusion is approximately 406 square feet adjacent to the truck court and 1,814 square feet for improvement of the existing utility access to be improved (2,220 square feet combined total). The additional proposed stream buffer enhancement along the west side of the stream is approximately 36,376 square feet and 37,533 square feet along the east side of the stream, providing an increase in enhanced stream buffer area (73,909 square feet total) which would not be possible without the stream buffer intrusion. This buffer stream enhancement area is much greater than area proposed stream buffer intrusion area, and is proposed as mitigation for the stream buffer intrusion. b) The buffer is increased adjacent to the higher functioning area of habitat or more sensitive portion of the wetland and decreased adjacent to the lower functioning or less sensitive portion; The project proposes to enhance the entire onsite portion of the stream buffer on the west side of the stream which is currently degraded. The proposed stream buffer intrusion is approximately 406 square feet adjacent to the truck court and 1,814 square feet for the existing access which will be improved (2,220 square feet combined total). The additional proposed stream buffer enhancement along the west side of the stream is approximately 36,376 square feet, providing an increase in enhanced stream buffer area. This will provide an improved buffer function and protection for the stream from the offsite improvements to the west. c) The buffer at its narrowest point is not reduced to less than 75 percent of the required width; and The proposed stream buffer intrusion at its narrowest point is approximately 5 feet, which is not less than 95 percent of the standard buffer width. d) Unless authorized in writing by a consenting neighboring property owner, the averaging will remain on the subject property. The proposed buffer enhancement area is proposed to remain onsite and not proposed to project offsite. The Director has detennined the proposed wetland and stream buffer intrusion request with buffer enhancement plan and the buffer averaging request meet the decisional criteria and is hereby approved as conditioned below: All recommendations in the Perteet Memo, dated November 19, 2018, must be addressed. Any revised reports and/or site/civil plans will be reviewed at the time a building permit application is submitted. The applicant must record with King County Recorder's Office, a restrictive covenant prepared by the City. The final critical area site plan, including Critical Aquifer Recharge Areas, shall be included as an Exhibit. Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doa LD.78436 Findings for Project Approval Page 7 9. Administrative Variance — Pursuant to Federal Way Revised Code (FWRC) 19.45.015, the applicant is requesting an Administrative Variance from the required front yard building setback along Pacific Hwy South to reduce the building setback from 20 feet to 15 feet. The purpose of the setback reduction is to allow the building and site improvements to be located closer to Pacific Hwy South and reduce and minimize the extent of the intrusion into the critical area buffers. The Director of Community Development may grant a variance that does not exceed 25 percent of the measureable standard only if all four variance decisional criteria of FWRC 19.45.030 are met. The criteria and the City's response are provided in the following sections. 1) That the variance will not constitute a grant of special privilege inconsistent with the limitations upon uses of other properties in the vicinity and zone in which the subject property is located. City Response A reduction of the front yard setback is not a grant of special privilege that is inconsistent with the limitation upon uses of other property in the vicinity and zone. The proposed use is an outright permitted use in the CE zone. Other sites in the vicinity would be allowed to develop with a similar facility. The applicant has demonstrated that due to the on -site critical areas and associated buffers, the building and site improvements would require intrusion into these buffers of greater extent if the front yard setback is not reduced. Therefore, staff concludes the variance will not constitute a grant of special privilege. 2) That the variance is necessary because of special circumstances relating to the size, shape, topography, location, or surroundings of the subject property to provide it with use rights and privileges permitted to other properties in the vicinity and zone in which the subject property is located. City Response The subject property contains on -site wetlands and streams located on the western portion of the site creating a special circumstance. Over 65 percent of the site is encumbered by critical and associated buffers/setbacks. The total square footage of useable site is significantly reduced compared to other similar uses in the CE zone. The project has been carefully designed in order to avoid and minimize impacts to the critical areas to the greatest extent feasible. A reduction of the front yard setback to 15 feet gives the necessary space to locate the building and site improvements closer to Pacific Hwy South to reduce and minimize the extent of intrusion into the required 100 foot stream buffer. Therefore, staff concludes the variance is necessary due to special circumstances relating to the critical areas and associated buffer and size of buildable area of the property. 3) That the granting of the variance will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity and zone in which the subject property is located. City Response Granting the variance will not be detrimental to the public welfare or injurious to the property or improvements in the vicinity and zone in which the subject property is located. The current Phase 5 of the SR HOV (Pacific Hwy South) project is under construction, having already acquired the necessary r- ight-of-way f onlage improvements. No impacts are Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc. I.D.78436 Findings for Project Approval Page 8 anticipated to Pacific Hwy South with a 1 S foot front yard setback. All other required yard setback will be met. Therefore, staff concludes that granting of the requested variance will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity and zone. 4) That the special circumstances of the subject property are not the result of the actions of the owner of the subject property. City Response The special circumstances related to the subject property are pre-existing conditions relating to the on -site critical area and associated buffers; the owner had no part in creating these conditions. Therefore, staff concludes that the special circumstances of the subject property were not the result of action of the owner. The City has reviewed the administrative variance request, pertinent decisional criteria, and the special circumstances surrounding the property at the time of development. The City approves the administrative variance request to reduce the required 20-foot front yard setback to 15 feet. 10. Bulk & Dimensional Requirements — Under FWRC 19.240.010 and 19.020.110, manufacturing and warehouse/distribution facilities have a minimum 20-foot front yard setback and 20-foot side and rear setback along the residential zone to the west, and 15 feet along all other zones. As mentioned in comment #9, an administrative variance to reduce the front yard setback to 15 feet has been granted. Maximum permitted building height is 40 feet above average building elevation. No maximum lot coverage applies. 11. Parking Requirements — Per FWRC 19.240.010 and 19.020.110, one parking space per 1,000 square feet of gross floor area is required for the project. For the office use, one parking space per 300 square feet of gross floor area is required pursuant to FWRC 19.240.080. A total of 108 parking spaces are required for the 5,000 sq. ft. office, 5,000 sq. ft. office mezzanine, and 73,845 sq. ft. manufacturing area (fractions are rounded up to the next higher whole number). As proposed, the project provides 108 parking stalls. 12. Landscaping — Under FWRC 19.125.060(9), industrial uses shall provide Type II landscaping 10 feet in width along all property lines abutting public rights -of -way and along the perimeter of the property abutting a nonresidential zoning district. Type I landscaping 25 feet in width is required along the property abutting a residential zoning district. Interior parking lot landscaping in the amount of 22 square feet per parking stall is required for the 108 parking stalls provided. The site plan depicts 2,514 square feet of parking lot landscaping. As part of the building permit application submittal, a revised landscape plan is required showing the buffer enhancement planting, minimum landscaping requirements per FWRC 19.125.060(9), plant species, size, quantities, spacing, and interior parking lot landscaping areas and calculations. Landscape Modification Request Modification to the required landscaping may be granted per the requirement of FWRC 19.125.100. A request for modification with response to the criteria is required to modify the landscaping requirements and must be submitted with the building permit application. The plan must be clearly labeled -as "Landscape- Modification Plan_" Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc, LD. 78436 Findings for Project Approval Page 9 13. Clearing & Grading — The project is subject to minimum clearing and grading standards of FWRC 19.120. The proposed development is subject to the requirements for rockeries and retaining walls specified in FWRC 19.120.120. Per FWRC 19.120.120(3), rockeries and retaining walls shall be a maximum of six feet in height and a minimum of three feet landscaped setback at the base of each rockery or retaining wall. Any proposed retaining walls must be depicted on the site, civil, and landscape plan submitted for the building permit application. 14. Tree Retention/Replacement — Pursuant to FWRC 19.120.130, compliance with the city's tree density requirements in the CE zone (20 tree units per acre) is required. Trees located within critical area buffers can be credited towards satisfying the tree units per acre requirement, as well as trees located within landscape buffers. At the time of building permit application submittal a tree retention plan must be provided depicting the tree unit calculation and how the site meets the tree unit requirement. 15. Forest Practice — The City has assumed jurisdiction over the review and approval of Class IV - General Forest Practices permits. The SEPA checklist included the information regarding the Class IV General Forest Practice Permit and a DNS was issued on Octobcr 7, 2018. A Forest Practices Application has been submitted to the City and is currently under review. Prior to issuance of the building permit application the City will issue a decision on the Forest Practice Application. 16. Community Design Guidelines — The building incorporates building forms, materials, and treatment methods consistent with the minimum guidelines, including structural modulation; varied roof heights; architectural emphasis at building entrances; variety of material and colors; and foundation landscaping. Site and architectural design must be consistent with the minimum requirements of FWRC Chapter 19.115, "Community Design Guidelines." A final Community Design Guideline review will be conducted at the time the building permit application is submitted. 17. Garbage/Recycling — Design and space requirements must meet criteria set forth in FWRC 19.125.150. The garbage and recycling facilities are screened by a solid wall and landscaping that is consistent with the site's architecture and design. 18. Transportation — As a component of the Use Process III application, projects undergo traffic concurrency analysis pursuant to the state Growth Management Act (GMA); goals and policies of the FWCP; and FWRC Chapter 19.90, "Transportation Concurrency Management." A Capacity Reserve Certificate was issued in September 10, 2018, for the development of an 88,974 square -foot warehouse. The number of new PM peak hour vehicle trips generated by the project is 59. A transportation impact fee is required and will be calculated based on the fee schedule in effect at the time a building permit application is filed, and must be paid prior to permit issuance. 19. Street Improvements — The site frontage on Pacific Hwy South (SR 99) is fully developed and no further improvements are required at this time. The FWCP shows a conceptual alignment for a planned shared -use (pedestrian and bicycle) paved trail between the 9d' Avenue South intersection with South 348'h Street, and SR 99 at 'South 352"d Street that curves through the subject property. A Non -Motorized Path, Type "AA", consisting of a 12-foot sidewalk with 4-foot planter strips and street lights in a 20-foot right-of-way is required or a written request to the Public Works Director to modify, defer, or waive the required street improvements (FWRC 19.135.070) may be submitted. Final design review and alignment will be conducted at the time a BLA or building permit application is submitted. Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc, I.D. 78436 Findings for Project Approval Page 10 There is conflicting information for the main driveway. The project narrative details the existing 30' driveway width cannot be widened due to newly constructed utilities, etc. However, a wider 46' driveway is shown throughout the plan set, including a truck turning template. The actual driveway width will be the greater 46' until or unless the applicant demonstrates that a narrower driveway width will safely accommodate the design vehicle. The north driveway is emergency access only. The final design of the north emergency access driveway will be reviewed at the time a building permit application is submitted in coordination with South King Fire & Rescue. 20. Stormwater — The project must meet the requirements of the 2016 King County Surface Water Design Manual (KCSWDM) and the City of Federal Way Addendum to that manual. Conservation Flow Control and Enhanced Basic Water Quality standards outlined in the KCSWDM apply. Best Management Practices (BMP's) must also be implemented to augment flow control. There is currently a five-year moratorium on open cutting within Pacific Highway South roadway. Prior to building permit issuance, a final Technical Information Report and construction plans shall be submitted for Public Works Department review and approval. 21. Water/Sewer — Lakehaven Water & Sewer District is the water and sewer service provider. Lakehaven issued certificates of water and sewer availability on August 2, 2017; certificates are valid for one year from the date of issuance. The applicant will need to submit applications to Lakehaven for any necessary water and/or sewer service connections. 22. South King Fire & Rescue — This project will require three fire hydrants. Fire apparatus access roads shall be installed and made serviceable prior to and during the time of construction. A fire sprinkler system and fire alarm system are required. A recessed Fire Department "Knox" brand key box is also required for this project. Fire review will be conducted at the time a building permit application is submitted. 23. Conditions of Approval — The following conditions of approval are attached to the Process III decision: 1) Prior to issuance of a building permit, a revised landscape plan is required depicting the buffer enhancement planting, minimum landscaping requirements per FWRC 19.125.060(9), plant species, size, quantities, spacing, and interior parking lot landscaping areas and calculations. A landscape modification request may be submitted pursuant to FWRC 19.125.100. 2) Prior to issuance of a building permit, the final landscaping plan must depict a minimum three- foot landscaped setback at the base of the retaining wall. If the retaining wall(s) are visible from public right-of-way or adjacent property, the construction plans shall depict wall materials as those composed of rock, brick or other textured/patterned wall styles to be approved by the Community Development Director. 3) Prior to issuance of a building permit, all proposed rockeries and/or retaining walls, including those associated with the underground detention vault and stormwater pond, must be depicted on the site/civil plans and must comply with FWRC 19.120.120. Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc I.D. 78436 Findings for Project Approval Page 11 4) Prior to issuance of a building permit, the applicant must submit and receive final approval of a groundwater monitoring plan to monitor quality and quantity of groundwater, surface water runoff, and/or site soils. 5) Prior to issuance of the building permit, all of the recommendations in the Perteet Memo, dated November 19, 2018, must be met. 6) Prior to building permit issuance, a final Community Design Guideline review will be conducted for compliance with FWRC 19.115 "Community Design Guidelines" (in particular FWRC 19.115.090(3) Commercial Enterprise (CE) zone district design guidelines). 7) Prior to issuance of a building permit, a final Technical Information Report and construction plans shall be submitted for Public Works Department review and approval. 8) Prior to issuance of a building permit, the transportation impact fees must be paid. Transportation impact fees will be calculated based on the fee schedule in effect at the time a building permit application is filed. 9) Prior to issuance of a building permit, the planned shared -use paved trail must be constructed, or a written request to the Public Works Director to modify, defer, or waive the required street improvements must be submitted. 10) Prior to issuance of a building permit, the applicant shall consult with representatives of Waste Management and provide written evidence that the project site design meets Waste Management's minimum standards. 11) Prior to conducting forest practices on the site, the City must issue the submitted Class IV General Forest Practice Application. 12) Prior to issuance of a certificate of occupancy, the applicant must record with King County Recorder's Office, a restrictive covenant prepared by the City. The covenant will state that no land surface modification may take place and no structure or improvement may be located in the Type F Stream Buffer and Category I, West Hylebos Buffer unless authorized by the City. The final critical area site plan, including Critical Aquifer Recharge Areas, shall be included as an Exhibit. 13) Prior to issuance of a certificate of occupancy, the applicant shall submit a boundary line adjustment to the Community Development Department, receive approval, and record the approved drawing with the King County Recorder's Office. 14) Prior to issuance of a certificate of occupancy, a final wetland and stream buffer enhancement bond sheet shall be submitted with the building permit. The performance bond sheet shall be reviewed and approved by the city's consultant, Perteet. 15) Prior to, and for the duration of, construction activity, the applicant must install temporary construction fencing containing silt screening fabric. A preconstruction inspection by the Planning Division is required to verify the silt fencing is installed per the final Stream Buffer Intrusion/Wetland Buffer Reduction Plan. Please contact the assigned project planner for final inspection. Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc ID. 78436 Findings for Project Approval Page 12 24. Conclusion — As conditioned, the proposed site plan application has been determined to be consistent with the FWCP; with all applicable provisions of the FWRC; and with the public health, safety, and welfare. The streets and utilities in the area of the subject property are adequate to serve the anticipated demand from the proposal, and the proposed access to the subject property is at the optimal location and configuration for access. The proposed development is consistent with Process I11, Project Approval, decisional criteria required under FWRC Chapter 19.65. The proposed site plan and application attachments have been reviewed for compliance with the FWCP, pertinent zoning regulations, and all other applicable city regulations. Final construction drawings will be reviewed for compliance with specific regulations, conditions of approval, and other applicable city requirements. This decision shall not waive compliance with future City of Federal Way codes, policies, and standards relating to this development. Prepared by: Becky Chapin, Senior Planner Date: November 21, 2018 Federal Way Tilt -Up Development (Panattoni Development) 18-100788-00-UP/Doc. I.D.78436 Findings for Project Approval Page 13 AkCITY OF Federal Way March 20, 2018 CITY HALL 33325 8th Avenue South Federal Way, WA 98003-6325 (253) 835-7000 www. cityoffederalway.. com Jim Ferrell, Mayor Panattoni Development Email: BM_ att_ sont�]a,panattoni.com Brian Mattson 900 SW 161h St, Suite 330 Renton, WA 98057 RE: File #18-100788-00-UP; LETTER OF COMPLETE APPLICATION Federal Way Tilt -Up Warehouse, *NO SITE ADDRESS*, Federal Way Dear Mr. Mattson: The Community Development Department is in receipt of your February 21, 2018, Process III Master Land Use (MLU) application for the construction of a warehouse building with associated site improvements, and intrusions into a wetland buffer and a stream buffer. Pursuant to Federal Way Revised Code (FWRC) 19.15.045, within 28 days of receiving an MLU application, the city shall determine whether all information and documentation required for a complete application has been submitted. NOTICE OF COMPLETE APPLICATION Please consider this correspondence a formal Letter of Complete Application. The Process III MLU application is deemed complete as of March 20, 2018. This determination of completeness is based on a review of your submittal relative to applicable requirements referenced within FWRC 19.15.040, "Development application submittal requirements." This notice of complete application does not represent any form of preliminary approval of the proposed site plan. A 120-day time line for reviewing the Process III application has started as of this date. The city's development regulations allow the department 120 days from the date that an application is deemed complete to take action on the application. However, the 120-day time line will be stopped any time the city requests corrections and/or additional information. You will be informed of the status of the 120-day time line when you are notified in writing that corrections and/or additional information are needed. ONSITE NOTICE Onsite notice of the complete application shall occur in accordance with FWRC 19.65.070(2)(b) et al, as noted below: The applicant is responsible for the installation of one on -site notice board at the following, location: the portion of parcel #202104-9027 fronting Pacific Hi hwa South. This sign must be installed on or before March 30, 2018. The City will prepare the notice board, which will be available for pickup by noon, Thursday, March 22, 2018. Following installation of the notice board, the applicant is required to sign and return to the City within five days a Sign Installation Certificate. Please refer to the enclosed public notice board handout for installation instructions. • There is a fee of $40.00 for each notice hoard. so a total fee of $40.00 must be paid at the time of pickiRg up the notice board. Mr. Mattson March 20, 2018 Page 2 At the time of the SEPA determination, the City will update notices on the installed Public Notice Board. The applicant is responsible for removal of the Public Notice Board, which shall occur within seven calendar days after the final decision of the City on the matter. CLOSING Formal processing and review of your application will now begin. Technical review comments will follow at a later date. If you have any questions regarding this letter or your development project, please contact me at 253-835-2638, or david.vandewe he ci offederaiwa .com. Sincerely, e I - � ���� Dave Van De Weghe, AICP Senior Planner c: Dan Balmelli, Barghausen, dhalmelliCalbarghauscn.com Erik Preston, Senior Traffic Engineer Ann Dower, Senior Engineering Plans Reviewer Chris Cahan, South King Fire & Rescue, via email Brian Asbury, Lakehaven Water & Sewer District, via email ene: Notice of Application Bulletin 035 - Public Notice Board 18-100788-00-UP Doe. I.D 77435 CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT DEPARTMENT DEVELOPMENT REVIEW COMMITTEE TRANSMITTAL DATE: 2/26/18 TO: Cole Elliott, Development Services Manager Peter Lawrence, Plans Examiner Rick Perez, City Traffic Engineer Brian Asbury, Lakehaven Water & Sewer District Chris Cahan, South King Fire & Rescue Lindsey Sperry, Public Safety Officer Rob Van Orsow, Solid Waste/Recycling Coordinator FROM: Dave Van De Weghe, Senior Planner FOR DRC MTG. ON: 3/15/18 - Internal FILE NUMBER(s) : 18-100788-00-UP i- I(� IO�7`j�-p(�•s� RELATED FILE NOS.: 17-105258-00-PC PROJECT NAME: FEDERAL WAY TILT -UP WAREHOUSE PROJECT ADDRESS: 1019 S 351st St ZONING DISTRICT: CE PROJECT DESCRIPTION: Proposal to construct an 89,000 square foot concrete tilt -up building with truck and office nodes and associated site work improvements. LAND USE PERMITS: UP III, SEPA PROJECT CONTACT: Dan Balmelli, dbalmeli@barghausen.com MATERIALS SUBMITTED: Vicinity Map, SEPA Checklist, Technical Information Report, Wetland Report, Title Report, Plan Sets ' GHAT ¢1� CIVIL ENGINEERING, LAND PLANNING, SURVEYING 4y w 2 Sc November 6, 2018 RESUBMITTED z"ka. E NOV 0 7 2018 Ann Dower CITYCFFEDERAL WAY COMM UN17YIDEVELOPMENT City of Federal Way Department Public Works and Traffic Division 33325 - 8th Avenue South Federal Way, WA 98003 -f RE: Responses to Department of Public Works and Traffic Division Comments Panattoni Federal Way Tilt 348 Development City of Federal Way Project No: 18-100788-00-UP Our Job No. 18943 Dear Ann. - We have revised the plans and technical documents for the above -referenced project in accordance with the comments in your October 9, 2018 memorandum as well as the comments from the Traffic Division. Enclosed are the following documents for your review and approval: 1. Four (4) sets revised Civil Engineering Design Plans 2. Four (4) each revised Technical Information Report (TIR) 3. Four (4) each Email Regarding Building Use 4. Four (4) each Updated Geotechnical Information by Terra Associates 5. One (1) each CD Containing PDF Document Files The following outline provides each of your comments in italics, along with a narrative response describing how each comment was addressed: PLANS 1. State the site area, building dimensions, and parking stall/aisle dimensions. /'Response: The site area has been added to the Cover Sheet whereas dimensions for the building and drive aisles has been added to Grading Plan. 2. Provide two pond profiles. Response: Two pond profiles have been added, to the plans as Sheet C7 - Detention Pond Sections. W r 3. Provide site profiles showing site grading and walls in relation to neighboring properties. Response: Two site profiles have been added to the plans as Sheet C5 - Site Sections. 4. This property is the downstream flow path for the adjacent property at 35109 Pacific Highway S, parcel # 202104-9047. To avoid future impacts to the applicant's property, and to allow �►y proper drainage and wetland recharge, an easement should be provided along the south property line so that when the adjacent property redevelops, drainage can be properly directed downstream to the wetland. 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES • TUMWATER, WA • KLAMATH FALLS, OR • LONG BEACH, CA • ROSEVILLE, CA • SAN DIEGO, CA www.barghausen.com Ann Dower City of Federal Way Public Works Department -2- November 6, 2018 Response: Discussions are currently ongoing with the adjacent property owner for easements, etc. Updates will be provided to the City when available. he topography and boundary information must be stamped and signed by a surveyor ,licensed in the State of Washington. -� Response: The boundary and topographic survey is included as Sheet 12 and is stamped and signed by a surveyor licensed in Washington State. TIR 6. Please include photographs, notes, conversations with downstream property owners, etc. documenting the site visit to the downstream flow path. Response: Photographs of the site are now included in the TIR as well as the downstream f flow path as requested. 7. Although Section 4.0 states that more specific information is provided on flow control sizing, no additional information or calculations were included in the TIR. Typically calculations are included in the preliminary TIR, and staff recommends that they be submitted for a preliminary, cursory review. Response: These calculations are now included within the revised TIR. L he T1R must demonstrate how the site wi!! meet Large Lot BMP Requirements outlined in e King County Surface Water Design Manual. This was not addressed in the TIR or on the ans. Please provide a complete breakdown of the various BMP methods and how they will, or will not, be used on site. � V, � �, C LP-4A j' Response: A narrative has been added to Section 2.0 Core Requirement No. 9 discussing Large Lot BMP Requirements. Additional geotechnical investigation is ongoing for the project to determine additional information for feasibility of these BMP requirements. 9. No water quality sizing was included in the TIR. Typically this is included in the preliminary TIR for cursory review. Response: The water quality unit has been sized to handle the 2-year release rate from the vault with capacity to handle the 100-year unmitigated flow through an internal bypass. These calculations are now included in the revised TIR. 10. The TIR must specifically address how section 1.2.2.3 Water Quality Impact Mitigation will be met using the methods outlined in that section. Response: Section 5 of the Level One Off -Site Analysis includes discussion of the water quality impacts from the 303(d) listed waters and issues for Hylebos Creek, downstream of the project site. These mitigation measures are described in Section 1.2.2.3 of the King County SWDM. Ann Dower City of Federal Way Public Works Department -3- November 6, 2018 11. Soils tests are required as part of the final TIR to establish the onsite infiltration rate. Response: Additional testing will be included in the Final TIR and will be submitted at time of final civil engineering design review. SEPA Checklist 12. Section 3.c. Water Runoff approved as written. Response: Comment acknowledged. PUBLIC WORKS TRAFFIC DIVISION (Erik, Preston, PE, 253-835-2744, erik.preston@cityoffederalway.com) 2018-08-30 Design Submittal Review 1. Show the frontage improvements under construction on Pacific Highway Son the plan set. Response: The frontage road improvements are now shown on the plans. 2. The Non -Motorized Path (shared -use trail) is missing from the plan set At a minimum, the conceptual alignment of the path and its Tract X should be included in the plans. Provisions for the trail and its construction or future construction will be a condition of land -use approval. Response: The conceptual alignment for the non -motorized path is now shown on the plans. 3. The Truck turning movement depicted takes all but 5 feet of the driveway width when entering, therefore the driveway must be widened to accommodate the entering vehicle and still leave room for an exiting vehicle. Incorporate SR 99 frontage improvements currently under construction or already constructed. Response: The driveway in question is newly constructed as part of the frontage improvements along Highway 99 which include a light pole, water quality device, and catch basin structures. Widening the driveway to allow for vehicles entering and exiting at the same time is not feasible. Based on the anticipated number of expected truck trips to the facility, trips can be scheduled to avoid conflict between vehicular and truck traffic. 4. North emergency vehicle access driveway is primarily for exiting vehicles only. Use a locked gate rather than bollards. Narrow the driveway to a width of 20 feet and design the driveway with an outbound right -turn angle or curve to only allow access for exiting emergency vehicles so it will be self -enforcing as an exit -only driveway. Response: The northern driveway has been redesigned with a width of 20 feet and is shown as curving southward as an exit only driveway. 5. Submit a Vehicle Turning Diagram to the Public Works Traffic Division once SR 99 frontage improvements are incorporated. This diagram will show how the appropriate design vehicle (such as: WB-62 or WB-70) can enter and leave the site without encroaching onto opposing traffic lanes or mounting a curb. Ann Dower City of Federal Way Public Works Department -4- November 6, 2018 Response: A vehicle turning diagram has been added to the civil plan set. The proposed design vehicle is a WB-50 of which the owner expects 2 to 3 trips per day. On occasion a large vehicle may need to enter the site but the frequency of that is expected to be less that once a month. We believe that the above responses, together with the enclosed revised plans and technical documents, address all of the comments from the Department of Public Works and Traffic Division. Please review and approve the enclosed at your earliest convenience. If you have questions or need additional information, please do not hesitate to contact me at this office. Thank you. Sincerely, Costa Philippides, P.E. Senior Project Engineer CP/lb 18943c.004.doc enc: As Noted cc: Michael Nuernberger, Panattoni Development Daniel K. Balmelli, Barghausen Consulting Engineers, Inc. Betsy Dyer, Barghausen Consulting Engineers, Inc. 1 \ IBM 463 \ RrY 2T4.54 \ IE 217.t W. If CONC \YEDERAL WAY HEATED STORAGE \ ALD12' t'\ EUNC BLOCK RET WALL 1. AC r 1 1 1 COS. B9 RET WALL ` Cwh DT4' IE 2321 R� 12' CMP 1E 232.1 SS4, 12' CPP 10' METAL, W/POWER, SOLUTIONS CENTER' HOME TIONS CEN ' ta' PAC IC HIGHWAYSO�TH - I ' 39 ,1 \ 40 ' - Y 1 AP 11_ CIS �rFOUR �rl LW Irk SD _ — — AC IE 238.0 SE, 12' CONC CB 2F696 ff INACCESSIBLE; CB BURIED FIR24' FE24:';.: 0ea1 ' r TVA PRV L S 1 PEP \ S! ` VACANT \J \ IE E 2,. � rco�N \ IE 224.0 & 4t" CONCmu 234,01 th 5D IIE Z1119 S,NE p CL 1 6' SIJOING GATE 1 1 I PLAN 0 10 20 40 60 SCALE IN FEET Approved By FILENAME TJS 06115 BID -� ENGINERRMG MANAGER OATS DETJSSIGNED BY DATE 51310fptl AVe, Ste 40L1 23�I.ffiasal nli 6 -- G-!FC2W%NAGER DATE DRANMBY DATE ,. ,_•*In, tw o Seeltle,WA98121 Iriax,:a,wA9act!� DOCUMENTS 1 KRS 00115 �$k yl.•�i, (2118126G1640 j4'++yT-0 .MOJI0 ENGINS5R DATE CHECKED BY DATE k11 * WWW#0p10 IIII b s CASCADE co i6m E 237.+. 1Y Djl�lkli RIM 2.-mia � E M2 SW, 12' CPEP SOMH 56424IE 236.2NE, 12' CPEPL TEE fFm 243.52 ECOBLOCK IE 237.4 S. IZ' DO 1E 2E71 E. 3C' CNP EELEY237.3241.SY[ T ii p Tpp pp OF TEE 9' POSTS W/ METAL RACK ECI 6' CHLK IE 2386 NE, 12- CPEP CITY Or, Federal Way larI rn 5 0 IN N eon CORRESPONDING SHEETS IE 2386 NE, 12- CPEP CITY Or, Federal Way larI rn 5 0 IN N eon CORRESPONDING SHEETS RIGHT OF WAY PLAN 49 SITE PREPARATION PLAN 67 ROADWAY PLAN 86 ROADWAY PROFILE 105 INTERSECTION DETAILS 118, 119 DRAINAGE PLAN 132 DRAINAGE PROFILE 151 WATER & SEWER PLAN & PROFILE 187 IRRIGATION PLAN 254 LANDSCAPE PLAN 276 ILLUMINATION PLAN 297 CHANNELIZATION & SIGNING PLAN 339 JOINT UTILITY TRENCH PLAN 355 GENERAL NOTES 1. STORM DRAINAGE STRUCTURES SHALL BE PER CITY OF FEDERAL WAY STANDARD DETAILS. 2. INSTALL VANED GRATES WITH STANDARD FRAME ON CATCH BASINS UNLESS OTHERWISE NOTED ON PROFILES, 3. LOCATION, DEPTH, AND SIZE OF EXISTING UTILITIES ARE APPROYINIATE. CONTRACTOR TO VERIFY WITH POTHOLING PRIOR TO CONSTRUCTION, 4. SEE STORwI DRAINAGE PROFILES FOR STRUCTURE CALLOUTS. STATION AND OFFSET LISTED IS TO CENTER OF THE STRUCTURE. 5. INSTALL POLLUTION PREVENTION MARKER AT EACH CATCH BASIN PER CITY OF FEDERAL WAY STANDARD DRAWING NO. 4-11. 6. USE CONVERSION RISER WHERE; ROUND SOUO CATCH BASIN COVER WILL BE INSTALLED ON DOST1NG TYPE 1 OR TYPE 1L CATCH BASIN PER CITY OF FEDERAL WAY STANDARD DRAWING NO. 4-18. 7. ALL. RECTANGULAR AND SOLID CATCH BASIN COVERS SHALL BE LOCKING PER CITY OF FEDERAL WAY STANDARD PLANS DRAWING NO. 4-07 AND NO, 4-13. 8. STORMWATER MEDIA FILTER STRUCTURE LOCATION STATION AND DFFSET PER DETAIL ON SHEET 167 9. ALL ROUND FRAMES AND COVERS WITHIN THE TRAVELED ROADWAY $'HALL BE HEAVY—DUTY HINGED STYLE WITH HIGH —IMPACT RISERS SEE SPECIAL PROVISIONS. CONSTRUCTION NOTES �I ADJUST STORM DRAINAGE STRUCTURE TO GRADE OCONNECT NEW STORM DRAIN PIPE TO EXISTING STORM DRAINAGE STRUCTURE O INSTALL STORMWATER MEDIA FILTER, SEE SHEETS 167 — 169 O REMOVE E70SDNG STORM DRAIN STRUCTURE 12 WAIL DRAIN. SEE WALL PLAN SHEETS 211 THROUGH 233 FOR WALL DRAIN PLANS, PROFILES, AND DETAILS RECONSTRUCT STORM DRAINAGE STRUCTURE WITH NEW TOP SLAB 15 AND ROUND SOLID COVER ROTATED CLOCKWISE FROM EXISTING POSITION AND ADJUST TO GRADE. SEE DETAIL ON SHEET 165 i6 INSTALL INTERCEPTION TRENCH, SEE DETAIL ON SHEET 165 18 SEE DRAINAGE STRUCTURE DETAIL ON SHEET 164 LEGEND CATCH BASIN TYPE 1 OR 1L C3 C3 CATCH BASIN TYPE 2 ©� MWATI R MEDIA FILTER FILTERRA OR MODULAR WETLAND) MODULAR WETLAND STORMWATER MEDIA FILTER STORM PIPE WITH DIRECTION OF FLOW xxxxxxxxxxxxxxxxxx REMOVE STORM DRAIN PIPE !/ STORM DRAIN STRUCTURE NUMBER PACIFIC HIGHWAY SOUTH PHASE V IMPROVEMENTS STORM DRAIN PLAN STA 37+50 TO STA 42+25 KPG PRC),IFC.T Nl 1am� cur 132 �77 ♦t Y�'�f `. Approved By 130225DPRF02.dw9 FILENAME F1�� , _ TJS DESIGNED BY 06/15 DATE SRGWEeA1NG WINAGER DATE - �- TJS 06116 . �Q DRAWNBY DATE PAOlBCT rowNGER GATE - KRS 00/15 PAO.*CT ENGINEER DATE CHECKED BY DATE 0 10 20 40 60 VERTICAL SCALE = 1/2 HORIZONTAL SCALE CORRESPONDING SHEETS RIGHT OF WAY PLAN 49 SITE PREPARATION PLAN 67 ROADWAY PLAN 86 ROADWAY PROFILE 105 INTERSECTION DETAILS 118, 119 DRAINAGE PLAN 132 DRAINAGE PROFILE 151 WATER & SEWER PLAN & PROFILE 187 IRRIGATION PLAN 254 LANDSCAPE PLAN 276 ILLUMINATION PLAN 297 CHANNELIZATION & SIGNING PLANI 339 JOINT UTILITY TRENCH PLAN 355 ic-11wIlk BID �1TraF PACIFIC HIGHWAY SOUTH STORM DRAIN PROFILE 3131 t1lbflAve,5e40g 7�1I1d$fSOnAre NA 1 TawmawA oz DOCUMENTS Federal Wa r�iVGiii11 ■1Gy PHASE V IMPROVEMENTS STA 37+50 TO STA 42+25 (Seab. 206)26-164, 12as)zarrisau {2S3]67t�'tp xwv.lgg.00m KPG PROJECT No 13022 1 SHT 151 OF 372 MEMORANDUM CITY OF Federal Way DATE: 11/15/18 TO: Doc Hansen FROM: Ann Dower Public Works Department SUBJECT: FEDERAL WAY PROPERTY (PANATTONI DEVELOPMENT) - (18-100788-00-UP) *NO SITE ADDRESS* Prior to building permit issuance, a final Technical Information Report and construction plans shall be submitted for Public Works Department review and approval. The project must meet the requirements of the 2016 King County Surface Water Design Manual (KCSWDM) and the City of Federal Way Addendum to that manual. Conservation Flow Control and Enhanced Basic Water Quality standards outlined in the KCSWDM apply. Best Management Practices (BMP's) must also be implemented to augment flow control. There is currently a five-year moratorium on open cutting within Pacific Highway S roadway. GHAV ci August 28, 2018 Mr. Robert Hansen, Planning Manager City of Federal Way Department of Community Development 33325 — 8th Avenue South Federal Way, WA 98003 RE: Site Plan and Stream Intrusion Plan Resubmittal for Panattoni Federal Way Tilt 348 Development City of Federal Way Project No: 18-100788-00-UP Our Job No. 18943 Dear Mr. Hansen, 1?S CIVIL ENGINEERING, LAND PLANNING, SURVEYING In accordance with your August 1, 2018 email, we are submitting revised site plans, preliminary grading and drainage plans and stream intrusion mitigation plans and exhibits to address the comments and impacts to the existing stream located along the west side of the project. As indicated in the email correspondence, the developer and design team has made every attempt possible to reduce the amount of intrusion into the existing stream while still providing a viable and feasible project. From the original site plan submitted with the initial SEPA and Site Plan Review application (Original SEPA Site Plan), significant changes and adjustments have been made to reduce and minimize impacts to the greatest extent possible. As a result of a meeting with city staff in early July, a revised site plan was submitted to the city outlining revisions made to reduce the stream buffer intrusion. These changes included the following : 1. Reduction of the number of parking stalls to meet the minimum required by city code based on the proposed use. 2. Reduction of the dock loading clearance from 130-foot to 125-foot to meet the minimum requirement of the proposed user for the size and type of semi -truck which will be used by the tenant. 3. Increase in the number of compact stalls vs standard stalls to reduce the overall site footprint. 4. Removal of the row of parking stalls along the west side of the project site adjacent to the dock loading area to further reduce the stream intrusion. Based on further input by city staff in a conference call between you and me on or about July 12, further adjustments to the site plan were completed based on your input and direction (1st Resubmittal Site Plan). These changes included the following: 1. The building and site improvements were shifted 5-foot east toward Pacific Highway South as requested. 2. The trash enclosure was relocated completely out of the 100-foot stream buffer. 3. The row of 90 degree parking stalls along the west side was relocated as much as possible to reduce and eliminate the stream intrusion by reducing the number of parking stall planters and providing parallel stalls where possible to meet the minimum code requirement. 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES ♦ TUMWATER, WA ♦ KLAMATH FALLS, OR ♦ LONG BEACH, CA ♦ ROSEVILLE, CA ♦ SAN DIEGO, CA www.barghausen.com Mr. Robert Hansen, Planning Manager City of Federal Way Department of Community Development -2- August 28, 2018 The resulting revised site plan being submitted for approval by the city is the Current Proposed Site Plan. All three site plans are included in this submittal to show the iteration process that was completed working with city staff to reduce and minimize impacts to the existing steam and 100-foot buffer. The resulting site plan provides minimal reduction to the 100-foot required buffer and results in a project that still meets the proposed tenants requirements. The current proposed site plan includes the following information: 1. Required 100-foot stream buffer and 190-foot wetland buffer lines. 2. Original proposed stream intrusion line. 3. Current proposed stream intrusion line. 4. Current proposed 142.5-foot wetland buffer line. 5. Area of stream buffer gained back between original and current site plan. 6. New location of dumpster outside of 100-foot stream buffer. 7. Proposed location of future boundary line adjustment line along revised wetland and stream buffer boundaries. 8. Proposed location of driveway to serve existing residence on south side of the project site. The revised preliminary grading and storm drainage plans incorporate the current proposed site plan and also show the required and proposed wetland and stream setback lines as well as the adjusted grading and retaining walls to maintain access to the existing residence on the south side of the site. The Technical Memo from Soundview Consultants addresses the wetland and stream comments in your email and also includes updated wetland and stream mitigation exhibits. Please review the enclosed plans and documents and let us know if you need any additional information to complete the SEPA and Process III Site plan review process. Thank you for your assistance. Sincerely, Daniel K. Balmelli, P.E. Executive Vice President DKB/dkb 18943c.003.doc enc: As Noted cc: Michael Nuernberger, Panattoni Development Costa Philippides, Barghausen Consulting Engineers, Inc. Betsy Dyer, Barghausen Consulting Engineers, Inc. Soundview Consultants 1.1.0 Environmental Assessment • Planning • Land Use Solutions 2907 Harborview Dr., Suite D, Gig Harbor, WA 98335 Phone: (253) 514-8952 Fax: (253) 514-8954 Technical Memorandum To: Robert Hansen, City of Federal Way From: Jon Pickett, Soundview Consultants LLC Re: Response to Comments —1019 South 351" Street Dear Mr. Hansen, g `ESU&AI o I ED AUG 3 0 2018 CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT File Number: 1638.0001 Date: August 24, 2018 Soundview Consultants LLC (SVC) has been assisting Panattoni Development Company (Applicant) with a wetland and fish and wildlife habitat assessment and development of a buffer reduction and enhancement plan, and has prepared a Wetland and Fish and Wildlife Habitat Assessment Report and Buffer Reduction and Enhancement Plan (report) for the proposed industrial development on an approximately 16.18-acre property located at 1019 South 351" Street in the City of Federal Way, Washington. The subject property consists of a single parcel situated in the Southwest 1/4 of Section 20, Township 21 North, Range 04 East, W.M. (King County Tax Parcel Number 2021049027). SVC submitted a revised report dated June 6, 2018, along with an accompanying Technical Memorandum dated June 5, 2018 which specifically addressed third -party comments. After the resubmittal of the documents, SVC, the Applicant and the Project Engineer met with City staff to review the project and the necessity for the stream buffer intrusion for the proposed site specific development. Following the meeting, several site revisions were made in an attempt to relocate required infrastructure originally proposed within the stream buffer, outside of the stream buffer to lessen the buffer intrusion to the greatest extent feasible. Due to site constraints and topography, not all infrastructure is able to be relocated outside the stream buffer; however, this current site plan only has a small area (3,500-square feet) proposed to be intruded near the truck court which is required for truck maneuvering and safety. Further building, parking, and truck court reductions are not possible and the building has already been shifted towards Pacific Avenue as requested by the City. On August 1, 2018, Mr. Hansen sent the Project Engineer (Barghausen Consulting Engineers) an email indicating the City would approve the proposed plans by the Project Engineer dated July 19, 2018, with the conditions summarized in the email. SVC is responding and addressing the critical areas comments as listed below: 1. Provide plans for watenvay delineations, wetland buffer enhancement and mitigation plan, planting plan, clean- up proposed, performance bond, and monitoring plan The report provide by SVC dated June 6, 2018, included a chapter (Chapter 6 — Results) detailing the site assessment results and the delineated wetlands and stream, both onsite and offsite. In Soundview Consultants 1J-C 1144.0012 Panattoni Development Company — Response to Comments August 24, 2018 Page 1 of 4 additional, the plan set by SVC dated June 6, 2018 also showed the delineated stream and wetland areas. The report include a wetland and stream buffer enhancement and mitigation plan (Chapter 7 — Buffer Reduction and Enhancement Plan), and within Chapter 7 includes a planting plan, clean up proposed for the buffer area, including the removal of trash, debris and invasive plants, and a maintenance and monitoring plan (Chapter 7.8) to ensure the overall success of the proposed project. The revised plan set dated August 24, 2018 (Attachment A) by SVC includes the revisions to the buffer area as a result of the approved site layout. These revisions have resulted in approximately 9,500-square feet of additional buffer enhancement area and have increased the number of plantings and area to be revegetated. A performance bond was not included in the report; however, this will be included in the final mitigation plan and is included (Attachment B). The language for the performance bond to be included will read: 7.11 MAINTNEANCE BOND Pursuant to Federal Way Revised Code (FWRC) 19.145.100, a maintenance bond may be required in accordance with FWRC 19.25.010 where the director of community development may require an applicant to establish a maintenance bond only if another provision of FWRC Title 19 or other ordinance specifically authorizes it. A maintenance bond quantity worksheet has been completed to estimate the required maintenance bond which shall be obtained in an amount equal to 110 percent of the total fair market cost of the construction/installation labor and material. 2. Explanation for the discrepancy in stream locations in the first site plan and the most recent. The delineated surveyed stream location has remained unchanged in the first plan set prepared by SVC dated February 15, 2018, to the resent plan set dated June 6, 2018. We trust that these clarifications satisf T the City of Federal Way's comments. The revisions and clarifications proposed in this Technical Memorandum will supersede and be in addition to the Wetland and Fish and Wildlife Habitat Assessment Report and Buffer Reduction and Enhancement Plan dated June 6, 2018, and will be included in the final mitigation plan. Please contact me as soon as possible should you have any additional questions. Sincerely, 949�* August 24. 2018 Jonathan Pickett Date Senior Planner/Scientist Soundview Consultants LLC August 24, 2018 1144.0012 Panattoni Development Company — Response to City Comments Page 2 of 4 Attachment B — Bond Quantity Worksheet Soundview Consultants LLC August 24, 2018 1144.0012 Panattoni Development Company — Response to City Comments Page 4 of 4 Attachment A - Site Plan Soundview Consultants LLC August 24, 2018 1144.0012 Panattoni Development Company — Response to City Comments Page 3 of 4 rn o rn o� o d o j a o m r o co m m CD N (s O s W ON w N 110 N m w � CD O LPJ coO N 7 7 t` m X v V N O cc(D N O tq Ln O a 3 Co rnco m v Ac m O {h O O O O O y N iII N U N N N N wi EA fA e9 V� N U C9 V C!3 EA w/ to CA L+1 N Vi N N N N w1 N wY N U N 69 N N w� w bs w N N wi C9 N U vi bi Vd eA to e! fA N CA fA eF EA eI� fA V3 M V3 w, fA rn M w+ u� 69 N m � CYl - a C c c t o 0 o O � m m m c ° o. m N a m G Z m ° m m m m t a ui > Y0 coO 3 = c CV m r N o C7 t7 O Lr) 0) co ( d't C7 N ` C A m � W r m 7 0. 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ASSUMES —NO LIABILITY OR RESPONSIBILITY FOR CONSTRUCTION, IMPROVEMENTS, OR ESTIMATES BASED ON THIS PLAN SET N w o gN w n ¢ x z Z W Q O N aD z N co W uz z N N W _ N Z J M 0 z N cl N� z Q z FEDERAL W ENELOP ll I DATE:11/06/2018 JOB: 1144.0012 BY: DS SCALE: SEE GRAPHIC SHEET 1 OF 9 DRAFT FOR REVIEW PANATTONI FEDERAL WAY — PROPOSED PROJECT AND BUFFER ENHANCEMENT PLAN PROPOSED STREAM BUFFER INTRUSION (ORANGE DASHED LINE) —406 SF I I ` ADDITIONAL STREAM BUFFER ENHANCEMENT AREA 36,376 SF PROPOSED REINFORCED EARTH SLOPE TO BE PLANTED - (SEE DETAILS AND CIVIL PLAN SET) - AREA OF CURRENT BUFFER INTRUSION TO BE IMPROVED 1,814 SF B 3:> Wiw"WWWiWW STORM DRAIN - `+ " W `W �• " ` AND SUMP PUMP W W W W W W W W W W W " W W W •v W W"+ yr W 142.5' WETLAND w + BUFFER REDUCTION (NOT A W� W W W STREAM Z, " y_ - W_1, W w W PART) 1 ; Ov r � i■ (TYPE F) W W +' " + " V WlW W i ♦-I, 1 W OHW " i W v W�W! 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L DATE:11/06/2018 JOB: 1144.0012 BY: DS SCALE: SEE GRAPHIC SHEET 2 0P 9 DRAFT FOR REVIEW PANATTONI FEDERAL WAY — PROPOSED PROTECT AND BUFFER ENHANCEMENT PLAN — NORTH DETAIL PLAN REMOVE INVASIVE PLANT SPECIES TQD AND DEBRIS FROM BUFFER AREA AND REPLANT ALL EXPOSED SOIL AREAS WITH NATIVE TREES, SHRUBS AND GROUND COVER (SEEPLANT SCHEDULE) ., N W r SPLIT RAIL FENCE 1 NOT REQUIRED AT RETAINING WALL PROPOSED REINFORCED EARTH SLOPE TO BE PLANTED - SEE DETAILS (ALSO SEE CIVIL PLAN SET) ANDSUMPPUMP - a Ell �.dwri i I ORIGINALLY PROPOSED STREAM BUFFER INTRUSION ' I '. LAKEHAVEN UTILITY DISTRICT ACCESS EASEMENT- A } -�-� - MIR t;t ■� BUILDING�s� V 5' BUILDING SETBACK SPLIT RAIL FENCE NOTE: INSTALL FENCE Z BEHIND BACK OF PAVEMENT THIS AREA CRITICAL AREA SIGN (150' MAX. SPACING) 0 25 50 190 GRAPHIC SCALE PRELIMINARY INFORMATION ONLY NOT FOR CONSTRUCTION SOUNDVIEW CONSULTANTS, LLC. ASSUMES NO LIABILITY OR RESPONSIBILITY FOR CONSTRUCTION, IMPROVEMENTS, OR ESTIMATES BASED ON THIS PLAN SET -D �1 N � r � J C Q.) x vz c O ,, 1 - =x z` N Ci o 00 z N z o H T IQP-1, O N ZW�Q o� w Q w w � DATE:11/06/2018 JOB: 1144.0012 BY: DS SCALE:SEE GRAPHIC SHEET J OF 9 DRAFT FOR REVIEW PANATTONI FEDERAL WAY - PROPOSED PROJECT AND BUFFER ENHANCEMENT PLAN - SOUTH DETAIL PLAN W Y y REMOVE INVASIVE PLANT SPECIES - 41 �, ~ AND DEBRIS FROM BUFFER AREA AND REPLANT ALL EXPOSED SOIL , AREAS WITH NATIVE TREES, SHRUBS AND GROUND COVER (SEE PLANT SCHEDULE) f UU uu _2A D,_ -4 SPLIT RAIL FENCE NOTE: INSTALL FENCE C-1 A ON BUFFER LINE STANDARD 100' STREAM BUFFER ii 1 J JU Z CATEGORY 1 190' ® WETLAND BUFFER 142.5' WETLAND �. BUFFER REDUCTION /Ur-bVVJ CRITICAL AREA SIGN (150' MAX. SPACING) SPLIT RAIL FENCE �i� ,4, - g _o 41 1 ' 5BUILDING lSETBACK B�� � . W B-14-/ B-15 1 1 V2 IM N S *4 J2 `= SHEET MATCHLINE �1 STORM POND rrrrrrr rrrr 11 F , r `- Itz rrr DP- D 25 5❑ I100 _ GRAPHIC SCALE 1'=50, PRELIMINARY IN FORA ATI ON ONLY NOT FOR CONSTRUCTION SOUNDVIEW CONSULTANTS, LLC. ASSUMES NO LIABILITY OR RESPONSIBILITY FOR CONSTRUCTION, IMPROVEMENTS, OR ESTIMATES BASED ON THIS PLAN SET M 0 0 z N z �zz H� Oxz a�x cq N wz Q w DATE:11/06/2018 JOB: 1144.0012 BY: DS SCALE: SEE GRAPHIC SHEF,T T OF 9 DRAFT FOR REVIEW PANATTONI FEDERAL WAY - PLANT SCHEDULE NATIVE PLANT SCHEDULE _w S (J U H 2 j � Z � o N 50% trees, 50% trees, 50% trees, a j C, W Z W W N � � Q - Z �Y�v UN NA��r s F � �7 = O & N f G 1 S Y r U . s z C _ x O x C v �- w � j � x -y M z 0 O N 00 00 z �- ��aH Z :_ Zi i-] C 5 � xz H %` Ca x 100% 100% I 50% 50% 50% shrubs@ shrubs@ shrubs@ shrubs@ shrubs@ 50% cov'g 50% cov'g 50% cov'g 100% cov'g 100% cov'g Plant Name Planting Areas Total Spacing Size Condition Planting Area _ Scientific Common Plant Status Buffer Buffer Enhance't Area - North East Buffer Enhance't Area - North West Buffer Enhance't Area - South Earth Slope -North Rein - forced Earth Slope - South Sq. Feet: 37,533 36,376 74,996 450 450 149,805 Trees Acres: 0.86 0.84 1.72 0.01 0.01 3.44 Abies grandis Grand fir FACU , 14 12 24 I - - 50 10 -12 ft 3 - 4 ft Bare root Dry Acer macrophyllum Big leaf maple FACU , 14 12 50 10 -12 ft Bare root Dry -outer edges of buffer Betula papyrifera Paperbark birch FAC 8 8 20 36 8 -10 ft 3 - 4 ft Bare root Dry/Moist -near stream and wetland Picea sitchensis ! Sitka spruce FAC 8 8 20 - - 36 12 -15 ft 3 - 4 ft Bare root Moist -near stream and wetland Prunus emargi�zata Bitter cherry FACU 14 12 24 - - 50 10 -12 ft 3 - 4 ft Bare root Dry Pseudotsuga menziesii Douglas fir FACU 12 12 24 - - 48 10 -12 ft 3 - 4 ft Bare root Dry -outer edge of buffer Thuja plicata Western red cedar FAC 12 12 24 - - 48 10 -12 ft 3 - 4 ft Bare root Dry/Moist Totals Shrubs Corpus sericea ;Red -twig dogwood 82 76 160 0 0 318 1 Bare root FACW 22 21 46 _ - 89 4 - 5 ft 2 - 4 ft Moist/Wet -near stream and wetland Gaultheria shallop Salal FACU 37 36 80 4 4 161 4 - 5 ft 2 - 4 ft Bare root Dry Lonicera involucrata Black twinberry FAC 22 21 46 - 89 4 - 5 ft 2 - 4 ft Bare root Moist/Wet -near stream and wetland Mahonia aquifolium Tall Oregon grape FACU 37 36 80 4 4 161 4 - 5 ft 2 - 4 ft Bare root Dry Polystichum munitum Western swordfern FACU 37 36 80 - 4 157 4 - 5 ft 2 - 4 ft Bare root Moist/Wet Ribes sanguineum Red -flowering currant FACU 48 45 95 4 4 196 4 - 5 ft 2 - 4 ft Bare root Dry/Moist Rosa gymnocarpa Bald hip rose FACU 48 45 95 4 4 196 4 - 5 ft 2 - 4 ft Bare root - Dry/Moist Rosa nutkana 'Nootka rose FAC 37 36 80 4 4 161 4 - 5 ft i 2 - 4 ft 2 - 4 ft Bare root Dry Bare root Moist Rubus spectabilis Salmonberry FAC i 37 36 80 - - 153 4 - 5 ft Salix scolleriana Scouler's willow FAC 37 36 80 - - 153 4 - 5 ft 2 - 4 ft Stakes Dry Sambucus racemosa Red elderberry FACU 37 36 80 - - 153 4 - 5 ft 2 - 4 ft Bare root Dry Symphoricarpos albus Snowberry FACU 37 36 80 4 - 157 4 - 5 ft 2 - 4 ft Bare root Dry Totals., Buffer Seed Mix 301bs/acre �exerata Spike ben SS 436 420 922 24 24 1,826 FACW 10 De.rchane pia ce ito.ra Tufted hair ass FACW 10 Dercha ria danthonioicler •Annual hair ass De�am sia elon ata Slender hair ass FACW FAC 10 10 El muc laucu.r Blue wild ye FACU 25 _ Hordeum Brach antherzrm Meadow barley FACW 25 L,i inur of h llur Streamluside ine FAC 10 DATE:11/06/2018 DRAFT FAR REVIEW PANATTONI FEDERAL WAY - PROPOSED BUFFER ENHANCEMENT PLANTING PLAN - NORTH AREA NATIVE PLANT SYMBOL LEGEND TREES ABIES GRANDIS FIR ACER MACROPHPYLLUM oGRAND BIG LEAF MAPLE m BETULA PAPYRIFERA / PAPERBARK BIRCH PICEA SITCHENSIS l • SITKA SPRUCE PRUNUS EMARGINATA BITTER CHERRY PSEUDOTUGA MENZIESII / DOUGLAS FIR `lY THUJAUJA PLICATA l WESTERN RED CEDAR SHRUBS CORNUS SERICEA I �J RED -OSIER DOGWOOD ••• GAULTHERIA SHALLON SALAL LONICERA INVOLUCRATA I O BLACK TWINBERRY MAHONIAAQUIFOLIUM/ O TALL OREGON GRAPE POLYSTICHUM MUNITUM / WESTERN SWORD FERN RIBES SANGUINEUM l 0 RED FLOWERING CURRANT ROSA GYMNOCARPA/ BALDHIP ROSE ROSA NUTKANA l ® NOOTKA ROSE RUBUS SPECTABILIS - SALMONBERRY SALIX SCOULERIANA O SCOULER'S WILLOW SAMBUCUS RACEMOSA 0 RED ELDERBERRY SYMPHORICARPOSALBUS ® SNOWBERRY SEED MIXES li iI 1p BUFFER SEED MIX j I]. + THROUGHOUT BUFFER kilk AT ALL DISTURBED AREAS PRELIMINARY INFORMATION ON Y NOT FOR CONSTRUC O SOUNDVIEW CONSULTANTS, L S Ul . NO LIABILITY OR MPONSI Ul tiFO CONSTRUCTION, IMPROVE f F_STINIATES BASED ON'T Ply S L LI Q0 NOTES: PLANTING DENSITIES, QUANTITIES AND LOCATIONS MAY BE SUBJECT TO CHANGE BASED ON CURRENT SITE CONDITIONS. r EXISTING NATIVE VEGETATION TO REMAIN. ALL DISTURBED AND BARE SOIL AREAS TO BE SEEDED WITH BUFFER SEED MIX. k ►�� ��* OX ►04:.11 T +I+ iP( 0 AREA - IlORTHNV ST J �s -eka i E • r "r .��MATCHLINE c Fo N �f x �o N M n N N � o gS J r U z Qi [_ •� OU � N 1 z -d Lz°= O ^ Cl� E c 3 O C� _ z .T. T ^ C. M O O 00 z N L1 z r.i O�pz F. /-� rn r V C7 P-+ W w w w Q w x DATF:11/06/2018 JOB: 1144.0012 BY: DS SCALE: SEE GRAPHIC SHF,ET /V OF 9 DRAFT FOR REVIEW PANATTONI FEDERAL WAY - PROPOSED BUFFER ENHANCEMENT PLANTING PLAN - CENTRAL AREA NATIVE PLANT SYMBOL LEGEND TREES ABIES GRANDlS GRAND FIR ACER MACROPHPYLLUM 0+ BIG LEAF MAPLE BETULAPAPYRIFERA/ ARK BIRCH PICEA CEA SITSITCHENSIS l SITKA SPRUCE PRUNUS EMARGINATA BITTER CHERRY PSEUDOTUGA MENZIESII / DOUGLAS FIR THUJAUJA PLICATA l WESTERN RED CEDAR SHRUBS CORNUS SERICEA l RED -OSIER DOGWOOD ••� GAULTHERIA SHALLON �o+ SALAL LONICERA INVOLUCRATA l O BLACK TWINBERRY MAHONIA AQUIFOLI UM / TALL OREGON GRAPE POLYSTICHUM MUNITUM / WESTERN SWORD FERN RIBES SANGUINEUM l 0 RED FLOWERING CURRANT ROSA GYMNOCARPAI BALDHIP ROSE ROSA NUTKANA l ® NOOTKA ROSE RUBUS SPECTABILIS O SALMONBERRY SALIX SCOULERIANA O SCOULER'S WILLOW SAMBUCUS RACEMOSA RED ELDERBERRY SYMPHORICARPOS ALBUS ® SNOWBERRY SEED MIXES BUFFER SEED MIX THROUGHOUT BUFFER AT ALL DISTURBED AREAS 1 3Q fi � � J GRAPHIC L, NOTES: PLANTING DENSITIES, QUANTITIES ° AND LOCATIONS MAY BE SUBJECT TO CHANGE BASED ON CURRENT SITE CONDITIONS. T S c EXISTING NATIVE VEGETATION O REMAIN. ALL DISTURBED AND �� S BARE SOIL AREAS TO BE SEEDED S I y 1h� WITH BUFFER SEED MIX. S VY " U U U • �LL1RI s ON l NS o� a p. 'alb + ■ /f w � w #-+ •0 {It A # i PA 61 C�.v. i-+ o -J N N O cn r G V m F :] N ? L a G ? o ° E OO ni Ci m 0 � z N N x O H 2 N �p�NQ zo H W M U z V w V) w x DATF:11/06/2018 JOB: 1144.0012 BY: DS SCALE: SEE GRAPHIC [SHF�,-T70r 9 ]RAFT FOR REVIEW PANATTONI FEDERAL WAY — PROPOSED BUFFER ENHANCEMENT PLANTING PLAN — SOUTH AREA NATIVE PLANT SYMBOL LEGEND TREES ABIES GRANDIS FIR ACER MACROPHPYLLUM 00+GRAND BIG LEAF MAPLE BETULA PAPYRIFERA / PAPERBARK BIRCH PICEA SITCHENSIS l SITKA SPRUCE PRUNUS EMARGINATA BITTER CHERRY PSEUDOTUGA MENZIESII / DOUGLAS FIR THUJA UJA PLICICATA l WESTERN RED CEDAR SHRUBS CORNUS SERICEA I ® RED -OSIER DOGWOOD GAULTHERIA SHALLON SALAL LONICERA INVOLUCRATA I O BLACK TWINBERRY MAHONIAAQUIFOLIUM/ TALL OREGON GRAPE POLYSTICHUMMUNITUM/ WESTERN SWORD FERN ®RIBESSANGUINEUMI C RED FLOWERING CURRANT ROSA GYMNOCARPA / BALDHIP ROSE ROSA NUTKANA I ® NOOTKA ROSE RUBUS SPECTABILIS + SALMONBERRY SALIX SCOULERIANA SCOULER'S WILLOW SAMBUCUS RACEMOSA 0 RED ELDERBERRY SYMPHORICARPOS ALBUS ® SNOWBERRY SEED MIXES BUFFER SEED MIX THROUGHOUT BUFFER AT ALL DISTURBED AREAS 4 GRAPHW/ SCALE \4/ / W- .Omm,r,rA— C t E E E E SPLIT RAIL c c FENCE c c NGPA SIGN 1 I �x QROVATER ND �� f 1 Cl�l H � N Z V H 0 (N wLd a� z MO N coo Z cb 3 n n N N Z ci 3z � W W x W = �(SrW o a CJ a N N 4-Ji ca O U J � F m U E z H m � z E z w � O � a AN x7 b g G T 0 c a a a � 0 C7 M 0 z 0 G1 N ti I--1 c 0z N w 0 0 Z Ln � h•-I W � C w�� a W Q w w x H DATE:11/06/2018 JOB: 1144.0012 BY: DS SCALE: SEE GRAPHIC SHEET V OF 9 DRAFT FOR REVIEW PANATTONI FEDERAL WAY - SITE DETAILS TREE AND SHRUB PLANTING DETAIL (TYPICAL) NOT TO SCALE LOCATOR LATH (IF SPECIFIED) SET TOP OF ROOT MASS / ROOT BALL FLUSH WITH FINISH GRADE OR SLIGHTLY ABOVE 3 to 4 INCH LAYER OF MULCH - KEEP MULCH MIN. 3" AWAY FROM TRUNK OF SHRUB NOTES: 1. PLANT SHRUBS OF THE SAME SPECIES IN GROUPS OF 3 to 9 AS APPROPRIATE, OR AS SHOWN ON PLAN. AVOID INSTALLING PLANTS IN STRAIGHT LINES TO ACHIEVE A NATURAL -LOOKING LAYOUT. 2. EXCAVATE PIT TO FULL DEPTH OF ROOT MASS AND 2 X ROOT MASS DIAMETER. SPREAD ROOTS TO FULL WIDTH OF CANOPY. SCARIFY SIDES OF PIT. 3. MIDWAY THROUGH PLANTING ADD AGROFORM TABLET AND WATER THOROUGHLY. 4. BACKFILL TO BE COMPACTED USING WATER ONLY. 5. WATER IMMEDIATELY AFTER INSTALLATION. UNDISTURBED OR COMPACTED SUBGRADE SPLIT RAIL FENCE DETAIL NOT TO SCALE Alt TYPE - STRSANGULPRI B, w". C@A j f— I r! j Kea a 12" TO 16" r 1 - � f _ 4'x4" ROUGH CEDAR POST low Il (TRIANGULAR) REINFORCED EARTH SLOPE FACING DETAIL (PLANTABLE FACE FILL - SEE CIVIL DRAWINGS) NOT TO SCALE INSTALL PLANTS IN FACE OF , REINFORCED EARTH SLOPE C350 TURF REINFORCEMENT MAT (TRM) INSTALL PLANTS IN FACE OF REINFORCED EARTH SLOPE OFFSET VARIES (6" MIN.) REINFORCED EARTH SLOPE FACING UNIT (SEE NOTES 1 AND 2) 6" (MIN.) BOTTOM WRAP OF C350 TRM INSTALL PLANTS IN FACE OF---_ REINFORCED EARTH SLOPE NOTES: KkSTS ARE PRE -DRILLED FOR FENCE RAIL INSERTS 4' TO 6' ROUGH CEDAR RAIL T MIN. cRus>•E� SURFACING TOP COURSE 6' MIN- (CSTC) 12" NOTES: DIAMETER 1. POM AND RAILINGS ARE PRECUT FOR ASSEMBLY. 2. 3 RAILS ARE PERMITTED. 3. FENCES SHALL BE PLACED AT THE APPROVED BUFFER EDGE. LOCKING TAIL STRUCT LIVE STAKE PLANTING DETAIL TENSAR BX1120 GEOGRID 1 e^ REINFORCED FILL 3" (MIN.) TOP WRAP OF C350 TRM EXTENDING BENEATH THE UNIT ABOVE MAXIMUM LIMIT OF TOPSOIL (SEE NOTE 3) SHALL NOT EXTEND MORE THAN 3" UNDER SUCCESSIVE FACING UNIT TENSAR UNIAXIAL GEOGRID IN ACCORDANCE WITH ELEVATION VIEW REINFORCED EARTH SLOPE CONNECTION (PULL SLACK OUT OF CONNECTION) 1. SEE REINFORCED EARTH SLOPE FACING UNIT DETAIL FOR FACING MATERIAL AND DIMENSIONS. 2. FACING UNITS SHALL BE CONSTRUCTED FROM BLACK STEEL. 3. TOPSOIL SHALL BE LOAMY SAND OR FINER GRADATION WITH 10% -15% ORGANIC CONTENT OR MATERIAL APPROVED BY A QUALIFIED LANDSCAPE ARCHITECT. 4. VEGETATION TYPE SHALL BE SPECIFIED BY A QUALIFIED LANDSCAPE ARCHITECT. NOT TO SCALE NOTES: 1. LIVE STAKES TO BE 1 TO 2 INCH DIAMETER 24 TO 32 INCHES LENGTH. 2. USE 1/2 INCH DIAMETER REBAR OR ROCK BAR TO MAKE PILOT HOLE. 3. INSTALL LIVE STAKES TAPER END DOWN WITH BUDS POINTED UP. 4. MINUMUM TWO BUDS ABOVE GRADE. 5. SET LIVE STAKES WITH DEAD -BLOW HAMMER. 6. WATER IMMEDIATELY AFTER INSTALLATION. W Qo w co 03 ow o J o �z STORAGE OF LIVE STAKES ALL WOODY PLANT CUTTINGS COLLECTED MORE THAN 12 HR PRIOR TO INSTALLATION, MUST BE CAREFULLY BOUND, SECURED, AND STORED OUT OF DIRECT SUNLIGHT AND SUBMERGED IN CLEAN FRESH WATER FOR A PERIOD OF UP TO TWO WEEKS. OUTDOOR TEMPERATURES MUST BE LESS THAN 50 DEGREES F AND TEMPERATURE INDOORS AND IN STORAGE CONTAINERS MUST BE BETWEEN 34 AND 50 DEGREES F. IF THE LIVE STAKES CANNOT BE INSTALLED DURING THE DORMANT SEASON, CUT DURING THE DORMANT SEASON AND HOLD IN COLD STORAGE AT TEMPERATURES BETWEEN 33 AND 39 DEGREES F FOR UP TO 2 MONTHS. NGPA SIGN DETAIL NOT TO SCALE 10M601-12"x18" PLASTIC SIGN WITH WHITE REFLECTIVE BACKGROUND SEE DETAIL, BELOW 4x4 PRESSURE TREATED WOOD POST WITH 1/2" CHAMFER AT TOP SLOPE CONCRETE TO DRAIN AWAY FROM POST 3' 1IN. 4 ' I ' ' CONCRETE COLLAR oil SIGN POST DETAIL 6" DEPTH CRUSHED ROCK NATIVE GROWTH PROTECTION AREA THIS WETLAND AND UPLAND BUFFER ARE PROTECTED TO PROVIDE WILDLIFE HABITAT AND MAINTAIN WATER QUALITY. PLEASE DO NOT DISTURB THIS VALUABLE RESOURCE. SIGN DETAIL M 0 z N 00 c� a z O zcn w cn 0 N W Oo In W P-1 CD w O W cn A w W H DATE:11/06/2018 Jos: 1144.0012 BY: DS SCALE: SEE GRAPHIC SHEET l OF 9 ]RAFT FOR REVIEW ¢GHAT ITI fi 4 Z U 2 aG �4I Lav y. l ,,ova ENc.%%a Leila Willoughby -Oakes City of Federal Way Community Development 33325 8th Avenue South Federal Way, WA 98003 November 6, 2018 RE: Administrative Variance Request Panattoni Federal Way Tilt 348 Development City of Federal Way Project No: 18-100788-00-UP Our Job No. 18943 Dear Leila: CIVIL ENGINEERING, LAND PLANNING, SURVEYING RESUBMITTED NOV 01 2018 CrTY OF FEDERAL WAY COMMUNITY DEVELOPMENT Panattoni Development Company is requesting an Administrative Variance from the required front yard building setback along Pacific Highway for their proposed warehouse project. The request is a reduction in the building setback from 20-foot to 15-foot. The purpose of the setback reduction is to allow the building and site improvements to shift to the east and reduce and minimize the extent of intrusion into the required 100-foot stream buffer along the west side of the project and provide adequate area to meet the requirements for a stream buffer averaging and buffer mitigation plan to be completed which would result in an overall improvement to the current existing condition of the stream buffer. The proposed reduced building setback from 20-foot to 15-foot would still provide for the required 10-foot of landscaping along Pacific Highway as well as a 5-foot pedestrian walkway. Over the past 12 months, Panattoni Development has been working closely with the City of Federal Way staff to revise, adjust and reduce the project development size and configuration to the greatest extent possible to minimize the area of intrusion into the stream buffer while still providing a project which is feasible and marketable. Numerous site plan and building alterations have been completed through an iterative sequential process through the city to reduce and minimize the impacts to the stream buffer. Copies of these site plan iterations are included with this submittal along with a summary of the main changes made with each iteration. The proposed building setback variance is one of the final site plan revisions incorporated into the project as required by the city to reduce the impacts. We believe that the proposed reduced building setback will result in a decrease of overall impacts to the environment and an improvement to the condition of the stream buffer. (Please refer to the updated site plan, landscape plans and stream mitigation report and plan included in this submittal.) 4. A written statement discussing the following criteria. a. That the variance will not constitute a grant of special privilege inconsistent with the limitations upon uses of other properties in the vicinity and zone in which the subject property is located. Response: The proposed variance will not result in a grant of privilege inconsistent with the limitations upon uses of other properties in the vicinity and zone of the project and will not result in any increased impacts to other adjacent properties or businesses in the area. The proposed variance results in shifting the building and site improvements 5-foot to the east which still allows for the required 10-foot of required landscaping along Pacific Highway as well as a 5-foot wide pedestrian walkway. The requested variance does not result in any increased negative impacts on the east side, north side or south side but reduces the impacts on the west side by providing additional clearance between the proposed development and the required 100-foot stream buffer. With the requested 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES ♦ TUMWATER, WA ♦ KLAMATH FALLS, OR ♦ LONG BEACH, CA ♦ ROSEVILLE, CA ♦ SAN DIEGO, CA www.barghausen.com Leila Willoughby -Oakes City of Federal Way Community Development -2- November 6, 2018 building setback reduction, only a small area of the proposed pavement on the west side (approximately 406 square feet) intrudes into the stream buffer by 3-foot to 5-foot maximum and the revised site plan provides more than adequate area to meet the requirements for a stream buffer averaging and mitigation plan. b. That the variance is necessary because of special circumstances relating to the size, shape, topography, locations, or surroundings of the subject property to provide it with use rights and privileges permitted to other properties in the vicinity and zone in which the subject property is located. Response: We believe that the proposed building setback variance from 20-foot to 15- foot is necessary due to special circumstances related to the size, shape, topography, and surroundings which includes extensive grade change and topography constraints, existing utility easements, access restrictions and extensive critical areas and buffers which encumber the majority of the site and constrict the developable area to approximately 36.1 % of the overall site area. The proposed variance is only one of many project changes and adjustments completed over the past 12 months through an iterative sequential review process working with city staff to reduce and minimize impacts to the stream buffer. The resulting development plan provides the best overall option to allow for a feasible development which creates the greatest extent of reduced impacts to the existing stream and buffer. c. That the granting of the variance will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity and zone in which the subject property is located. Response: Approving the proposed building setback variance from 20-foot to 15-foot along Pacific Highway will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity. Since the proposed does not change or modify the building or site plan layout from what is currently proposed, the change does not have any impact on the general public or adjacent properties and would not even be substantially noticeable to the public or adjacent properties. The resulting change would provide more than adequate setback between the building and right-of-way and still provides for the required landscape setback of 10-foot along Pacific Highway in addition to a 5-foot pedestrian walk. Shifting the building and site to the east provides for additional clearance and setback between the stream buffer and the edge of pavement and parking areas of the proposed development and reduces both the area of the buffer intrusion to approximately 406 square feet and the width of the intrusion to a maximum of approximately 5-foot. A chain link fence will also be placed along the back edge of the development to prevent entrance into the buffer and provide a physical barrier to help mitigate any sound, light, glare, noise and pollution impacts to the stream and buffer. The chain link fence is proposed to be located two feet behind the back edge of the curb and would be part of the proposed buffer mitigation. (Please refer to the proposed site plan, landscape plan and critical area report and mitigation plan included in this submittal.) Leila Willoughby -Oakes City of Federal Way Community Development -3- November 6, 2018 d. That the special circumstances of the subject property are not the result of the actions of the owner of the subject property. Response: The special circumstances of the property resulting from the proposed building setback variance from 20-foot to 15-foot are not the result of actions of the owner or developer of the property. Due to the extent of critical areas located on the project site which include wetlands, stream and buffers, only approximately 36.1 % of the property is useable for development. In addition, existing utility easements, access limitations and topographic relief add to the development constraints and limitations of the site. The iterative sequential building and site plan options which have occurred over the past 12 months working with the city staff, the developer and design team have resulted in a project layout and design which reduces impacts to the critical areas and buffers to the greatest extent possible but also provides for a project that is still feasible and marketable for the developer. These changes combined with the proposed stream buffer averaging and mitigation plan should result in a stream buffer which is of better quality than existing conditions of the buffer. The following plans and documents are enclosed: 1. Four (1) each Letter Discussing Administrative Variance Criteria 2. Four (4) each current Preliminary Site Plan 3. Four (4) each Preliminary Site Plan Previous Iterations and Emails Summarizing Site Plan Changes 4. One (1) each Updated Master Land Use Application 5. One (1) each Stamped Envelopes for Property Owners within 300-Foot Radius 6. One (1) each CD Containing PDF Document Files 7. One (1) each Check for Administrative Variance Fee in the amount of $811.25 We believe that the above plans and documents compile a complete administrative variance request package. If you have questions or need additional information, please do not hesitate to contact me at this office. Thank you. Sincerely, JD'—�'o )-�- Daniel K. Balmelli, P.E. Executive Vice President DKB 18943c.005.doc enc: As Noted cc: Brian Mattson, Panattoni Development Costa Philippides, Barghausen Consulting Engineers, Inc. Betsy Dyer, Barghausen Consulting Engineers, Inc. CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT DEPARTMENT DEVELOPMENT REVIEW COMMITTEE TRANSMITTAL DATE: iia V:nT@3vA FOR DRC MTG. ON: FILE NUMBER (s) : RELATED FILE NOS.: PROJECT NAME: PROJECT ADDRESS: ZONING DISTRICT: 7-24-18 Ann Dower, Development Services Scott Sproul, CBO, Building Official Sarady Long, Transportation Planning Engineer Brian Asbury, Lakehaven Water & Sewer District Chris Cahan, South King Fire & Rescue Leila Willoughby -Oakes, Planning Please email me any comments you might have on the site redesign primarily Fire and Building by August 17th, 2018 (sorry this not to scale...) . 18-100788-00-UP 17-105258-00-PC FW` WAREHOUSE/PANATTONI (AEROSPACE MANUFACTURING USE) 1019 S 351st St (Parcel: 202104-9027) Commercial Enterprise (CE) PROJECT DESCRIPTION: Doc and I have been working with the applicant to reduce their critical area intrusions. As a result there are some changes to the footprltrrf-/improvements. Footprint from 89,000 to 714M square feet. *Proposal to construct an 89,000 square foot concrete tilt -up building with truck and office nodes and associated site work improvements.* LAND USE PERMITS: UP III, SEPA PROJECT CONTACT: -Dan Balmelli, dbalmeli@barghausen.com MATERIALS SUBMITTED: Revised Site Plan- due to stream buffer intrusion reduction 1' II�f If I I1( II III I I di, II ( / / I r I / I / / / I / I� I it i -_-- IL �� - 746,32' NBS72'SOW NORTH VICINITY MAP PROJECT INFORMATION PROJECT SCOPE: NEW BUILDING PROJECT ADDRESS: 1019 S 351s1 ST FEDERAL WAY, WA 98003 BUILDING OWNER NEUMEIER ENGINEERING, INC 22610 89TH AVE S KENT, WA 98031 (253) 854-3635 PROPERTY TAX NO: 202104-9027 ARCHITECT SYNTHESIS PLLC 12503 BEL-RED ROAD, SUITE 101 BELLEVUE. WA 98005 (425) 646-1818 CONTACT: RANDY BROWN STRUCTURAL: SHUTLER CONSULTING ENGINEERS 12503 BEL-RED ROAD, SUITE 100 BELLEVUE. WA 98005 (425) 450-4075 CONTACT: JOHN HEADLAND I ZONING INFORMATION 1, Jvistlttioli: FEDERAL WAY, WASHINGTON 2, Present Zonmg: CE - COMMERCIAL ENTERPRISE 3. Comprehensive Plan Designali-CE - COMMERCIAL ENTERPRISE S Protected site use requiresNO ACTION 4, Use Zane Adjacent Lots: N. E k S CE W SE 5 Special Regulations Applicable A Shoreline M,nogemenl Act Yes A No Setback required fe{s AIA wA G.4 B Flood Plain ,r Waleraa,, Yes C Airport open use/glide path Yes Np % 0 Storm Water Relenbon/Run-Olt Yes No X E fire Lane Requirements ,tin f r am}y 6 Setbacks Required' Front Yard 20' Rear Yard IS N Side Yard 15' S Side Yard 15 7 E,semenl5, Vocations, restrictive o,nven,nls as applicable SFf CML DR.4WNGS �C •s��iYr 1 r ' Ei65TVTG fD+CE 15' fA1W05'w* t1y6�0-p- M1 F'AE ,WCF55 y ONLY Et11ClLIE W7LIA105 � I I MON DRINEW I TIP _ 1$ 1a , I � I x Q� I E SITPLAN V-/ 0 25' 50' Irn' is SCstr i' . 50'-0• �n. t- • 50 8 Padring Building Shell (Office space are, is sp... h1ve) OIRce 5,000 SF 00:Z I Slal/300 SF MIT Siats Mezzanine 5.000 SF 1 Stoll/300 SF 16.7 SOp Manulmh,n.g 73.845 SF I Slall/1,000 SF 738 Slap P,,k.ng Stalls Required 5 Amessihle ( 1 Vm) 103 P W g 107.2 Told Porting Stall Provided 5 Accessible ( Y Van) 1D3 Par4irg 100 Total SWedo,a 62 2&- 9'-6'r W-0 -- Campad _�i a w.d_5¢L 9'-0- a 1 F-0- - 9 Tolal Site Are. 890,167 SF P.&hq Lot Landscaping Required: 22 SF • TON 214ft 2,375 SF Parting Lot Landscaping Provided 2,514 SF SITE DATA SITE AREA 688.167 SF USABLE SITE AREA 231.209 SF USABLE SUE COVERAGE 34 6% GROSS BUATING FOOTPRINT 7' 4 �F GROSS BUILDING AREA 63,845 IF OFFICE (Isl Floor) 5.000 SF ♦ 2nd Floor OFFICE 5.000 SF MNFG/WHSE 73,845 SF DOCK -HIGH DOORS 13 GRADE DOORS 3 NEW IANDSUPING EXISTING LANDSCAPING TI1 BE CLEARED ON USABLE SITE RETAINING WALL. PER CIVIL. 12503 Bel -Red Road, Suite 101 Bellevue, WA 98005 p 425 646 1818 f 425 646 4141 NEUMEIER ENGINEERING, INC 22610 88TH AVE SOUTH KENT, WA - 98031 1 07 02 2018 BID SET —Ena M ns. PROGRESS PRINTING July 19, 2018 TILT 348 1019 S 351ST ST FEDERAL WAY, WA - 98003 a sc Foa BID SET artE. SITE PLAN DE—ca B, Jim— e• o.rz 05 07 2016 p A1.1 osaccr ea 720181001 oaw ar+na.arLsa Kit take) nentary + ;6TH:AVE-S-.- S', r r Zrc�s r i rrs S-348TH:ST-- — West Hylebos Wetlands' �3 Park Z +i 4 4� H5•belos Blueberry S 356TH=ST—=Farm-Park•.. 5T — I Brookrake Ctir i5tiarr S�fino[ 5 361: i. p �LJ m 46 it 99 . S 364TH ST REFERENCE: Rand McNally (2017) Scale: Horizontal., N.T.S. Vertical: N/A ¢C014AOs 18215 72ND AVENUE SOUTH KENT, WA 98032 'Z (425) 251-6222 s (425) 251-8782 s •4A aW CIVIL ENGINEERING, LAND PLANNING, 8lJG1N��P SURVEYING, ENVIRONMENTAL SERVICES S -340T H -STS -340TH -ST— � N 'Corner s-341sT-P_ I S 3415T-PL- if. a 7 —S343R© ST- 5 344TH-57 - 5-3�14TH ST ---- I, �f a� $- 5487H-ST= --- 9 SITE — V TM-ST r s-js�rH-sT - d a L-S-360TH= ti s � 'I � N HHdd %S aIio eR6*EI /En H�yh StM1aal I V IJ ,t WAY �� FEB 212018 5; 364TH PL= , CITY OF FEDEF]A! WAY COMMUNRY wl npuakm For Job Number Panattoni Federal Way 18943 Federal Way, Washington Title VICINITY MAP 02/08/18 P:118000s1189431exhibitlgraphics118943 amap.cdr � n I _ LEGAL DISCRIPTION I_ EX. 6" WATER UNE ' LEGAL DESCRIPTION h V BEGINNING AT THE INTERSECTION OF THE WEST LINE OF STATE ROAD I Elf 10' PVC �j MONUMENT IN CASE AND THE SOUTH LINE OF THE SW 1/4 OF THE SE 1/4, THENCE t 1 ` SAN SEWER LINE EX. CB #2 y Crt CT .47 OF FEDEP.AL WAY N22.48'24'E ALONG THE STATE ROAD FOR A DISTANCE OF 56.24 1 :`y RIM = 241.99 w BENCH MARK NO. 2166-62-1 FEET; THENCE N2212-E A DISTANCE OF 187.76 FEET; THENCE \/ 7' INV - 239.66 IN) ELEV=212.453 N57.56'08"W A DISTANCE OF 221.30 FEET; THENCE S22-47'52"W A INV = 239,55�OUT) ' DISTANCE OF 364.96 FEET; THENCE N88-32.33"W A DISTANCE PF 4'• 1W00 AREA \ 234.48 FEET AND THE TRUE POINT OF BEGINNING iii 1 BEING A PORTION OF THE SW 1/4 OF THE SE 1/4 OF SECTION 20 N TOWNSHIP 21 N, RANGE 4 EAST, W.M., IN KING COUNTY, A%� I� (1 '•� - �m WASHINGTON. EX. P PO �� 1 \\ / f • 2 \ ` Fk A� ' 4, PROTECT EX SSMH NOTE: w 1 1 ?0 r EX. PO�EROLE 1_ ALL WORK AND MATERIALS SHALL BE IN ACCORDANCE WITH KING COUNTY AND CITY OF FEDERAL WAY STANDARDS AND SPECIFICATIONS - SCALE 1' = 20' , PROVIDE ASPHALT RAMP H2-1 A EX. WATER 1JETER SLOPE FLUSH W/ EX ASPHALT 2 HYDROSEED ALL DISTURBED AREAS_ SEE EROSION CONTROL PLAN FOR SEED MIXTURE INSTALL NEW E ! +�, CATCH BASIN p1 - 4$" DIA. ORL PA C ' tc 3_ PRIOR TO CONSTRUCTION CALL "ONE -CALL" (1-800-242-5555) TO LOCATE • RIM�235.00/ SOLID LOCKING LID �/7� / IE �230.37 I I�/'+'/j IJ AREA JY I SAWCUT AND REMOVE EX CONIC. EXISTING UNDERGROUND UTILITIES I ) /� y4 / \ ti AS NECESSARY TO INSTALL IEe23Q.37 T) / {/ M10`� �q F Jj v NEW CONC. SIDEWALK 4. CITY OF FEDERAL WAY PUBLIC WORKS DEPARTMENT PRE-CONSTRUCTION/INSPECTION III PI►J/ � PROTECT EX STAIRS TO NOTIFICATION PHONE NUMBER. (661-4131) AhF:1I I t • ®Cf2fl9 LIN�'b / EX. BLDG �- EX BUILDING "f� (1 1 ����� I pr�l7Egg y 1Bar ~ ,I 5. FOR GRASS SEED MIXTURE FOR GRASS LINED BIO-SWALE, SEE SHEET 2/4. t+7f 1 Qa So.FF. 1.uad SaFT. IO *HDvAKL- hpli" Fs� weft k I&T�b � � f�X1r � 0 EX.C.O- /J 6 CONTRACTOR TO VERIFY EXISTING 60 FOOT LENGTH OF INFILTRATION TRENCH. �VEx6YCr•TY �' SAWCUT EX ASPHALT ALONG INSTALL AN ADDITIONAL 32 FEET aF INFILTRATION TRENCH W/ AN AFFECTIVE AREA OF �07.{t7 ly }'� Li�fiN�,E jj f.5'W�oE BERM' - FOG UNE AND REMOVE EX PAVEMENT \ n h �i ;'1 &0 FEET WIDE AND 20 FEET DEEP. CONNECT 6" PERF. PVC PIPE TO EXISTING 6" PIPE, L1TY a PEM.01&L w� \ 10'"•8' P ■ � EX. 14" 7 j 1 WEST OF FOG LINE y O% SLOPE ON NEW PIPE. ELEVATIONS OF ADDITIONAL TRENCH TO MATCH EXISTING. APR 0.5k Z32 FIR �Qg 1 �' ! REPLACE W/ NEW 4" WIDE . ` CQ1yryE Nk'N g" i0'-8" CMP A 5.6% ro w � 9 1 I ,� CONTINUOUS WHITE STRIP. 7_ ALL NEW CATCH BASINS INSTALLED WITHIN SITE AREA SHALL HAVE PVC ADAPTORS 6 PVC PIPE tl E+t0 C.�. �y [E.-231.49 h ' hQ ! I '1 e fcmr4 12" 6mr, EX. PERF. VC PIPE - /r ` R V aillia Ay r Iw> p to wuN TO IE.=230.32t ' , \ / //ILL ¢q2 a1 r REMOVE EX CONIC. CURB ce", A 1iG PLn) -'2 LS 7 WAS / /// V47 �qr 4 ] :'r• AND SIDEWALK 1wr�I K'utp. aK- ;'rw T' , v71W '' TABLE OF CONTENTS Ex. a' 3\y�' O 236 SSx ,lu '.•�. , DRAINAGE, GRADING & STREET IMPROVEMENTS 1/3 VA- GRATE 60 •DQ C ry L f=.•i-%1.65) /L - .f"5 NEfi'. EX7RU ❑ q n' r� 'I ryry EX. 8" WATER MAIN DRAINAGE DETAILS & NOTES 2/3 COV„ I i�/ Ip �l = DETAILS 3/3 O.F.=•'e41Y �+ 1 $ .q 1q,.I �37.2Q ,1 EX CONIC WALK ^^ffA`7' L ' -•] NEW 0.5' CONC. RIP RAP ()U7� �6�� T i • ] 'I,J I t/ CURB W/ EX CONC CURB 1, E. 'NiL3 6' W1OE Y V LONG �, 70 �' A'E'Ip 11 6 R=10' .q .'I If I GUTTER 1 EEP ) 1 I A. 1 A 3' TYPICAL ! (SEE DTL) INSTALL EW SM. ' r+ � j11EJf. f/232.2 r2 ?'3j >p "• I 1 CATCH BASH PLAN 8-26 FEDERAL WAY _ 'Z. IrR S 4 �., 1, RIM=237_BO MW/VANE GRATE EX GB B AB N i IE=235.26(OUT) RIM = 234.62 INV = 230.2(C' 1 2 70 I� 1 INV = 230.3U2 OUT) \ I - CAP END _ ss�61w jf HS E 11 NEW 5% SAY. y I 1 ®W 07%'^ 12" RCP 'I-, : I\ TYPE II CATCH BASF/jj j '{;y' RIM=236.00 [Sd.iD LOCKING � � � 23630 - � �}£ ` IE.[0 SEPERAT00-232.25 �'2 1 s IE- 32-26 _ EX. CB e 1} OLD COFFEE CUP EX Po �A � RIM = 238.03 =^• �I TAVERN BLDG. r / ( ) INV = 235.16 WOODED AREA .E3X� i1.T, JF q LINE q'�'•+` .r INV = 235.13(OUT) 7� FF=237.O01 a O>F �(Z'. I L 5a�.o c�n,N� Lip 2.40D SD.FF. GE 6 y EX. WHITE E If'AVE6IEN L f r' [FDC, LINE • ,^v` RI. [.�Q q I� EX. PHONE UN _ l ti n JJ C1 Ca � I 3 DUCT BANK V � PROVIDE NEW ASPHALT VICINITY MAP 1 G] PAVEMENT STRIP. MATCH o REMOVE EX. CURB T n��1� TO EXISTING. (SEE DTL) '$. PRONOE142' OF NEW �C.. k 'i I • �Ai TRENCH W/ Wy fl- PVC PERF PIPE ; 'L� IE'p OiE p6 & DTLY Q 4 \ iiil REMOVE EX. CONIC. CURB ' ET(. CA #9 (ABANDON) `- � / Npjr"� � I$a _ SAWCUT EX. ASPHALT ALONG _ ` CUT AND REMOVE 9ECRON OF r1O _ FOG LINE AND REMOVE EX. • PAVEMENT RIM 235.51 \\��Y EXIST. 12" dAP PIPE AS REOLXREpp ITS WEST OF FOG LINE. / INV = 233.27(OUT) \\ IV 0 INSTALL NEW STD. PLAN 8--26 z REPLACE W NEW 4" WIDE CATCH BASIN �6.s6E ks•[3uee.r p I CONTINUOUS WHITE STRIP. PROVIDE CURB RAMP _ PER WSDOT STD. PLAN F-6 I �[IFY TF�T 19 1�PAWI+l�iy Pf E 234.88 • • ,10' LONG X 4' WIQE , 2'-12" RCP !4-NIL] 0� 6P f" � . IRy4 PY CONIC. PAD 4" THIQK M� Al= IiYEi" YK Plli06�{IoFI- �^ ~- E)(ST- T 1 INV = 229.95 SAWCUT AND REMOVE EX ASPHALT nr ry El(15T- ROCKETt1' CUT & FILL: ^"- ' mp PROTECT E)L GUARDRAIL N ;F� HAND PLACE ASPHALT FLUSH WITH NEW �`+ �k sww4 , rE REQUIRED AMOUNT OF CUT FOR SITE GRADING IS APPROXIMATELY 533 CUBIC YARDS. `"- �PROIECr 4 SIDEWALK. EXTEND ASPHALT BEYOND NO FILL IS REQUIRED FOR THIS SITE. @X. CONIC EXISTING GUARDRAIL AND MATCH TO TRAFFIC 8A; nER EXISTING GRADE. PERMIT NO.: BLD 93-1027 N I PROTECT Ex CONIC. CURB CITY OF FEDERAL WAY AS -BUILT SITE AREA = 1.59 ACRES N 14 1 20% IMPERVIOUS SERFACE (DEVELOPED) APPROVAL 7 F.F:-(71I1L'; V$ JRE' 'S `S'F PREPARED BY OWNER �1 SHEET 5% LANDSCAPING AR£A (DEVELOPED) - '' DARRELL BORNSTEIN 75% UNDEVEPOLED AREA 5 REVISED PER CITY COMMENTS SLM JRE 12/29/ JOHN R. EWING P.E. P.L.S. �7 P.D. BOX 5604 BELLINGHAN, WA 98227 (206) 733-2269 5 REVISED PER CITY COMMENTS SLM JRE 11 /29/9 s is mac' 1 DATE CIVIL ENGINEERING -LAND SURVEYORS '',�1ff Y1 PROJECT PARKING LOT IMPROVEMENTS DATUM 4 REVISED PER WSDOT COMMENTS SLM JRE /211/g3 CITY OF FEDERAL WAY BENCH MARK NO. 2166-52-1 (VERTICAL DATUM NGVD-29), 5/4/93 3 REVISED PER WSDOT COMMENTS SLM JRE ,/"/93 JRE 1320 SOUTH CENTRAL AVENUE KEN7. WASHINGTON 206 852-6633 v 35109 PACIFIC HIGHWAY SOUTH TOP OF F 356TH IN CASE. CENTER OF HIGHWAY 99, APPR070MATELY 300 FEET JOB NO- 2 REVISED PER WSDOT COMMENTS SLM JRE 8/6/93 DESIGNED BY DRAWN BY CHECKED BY - SH T7��,y' NTT �] NORTH OF 356TH STREET. ELEVATION ®212,453 1 REVISED PER WSDOT COMMENTS SLM JRE I/21 /93 -' `•-, - Pt1RKING LOT IMPROVEMENTS, DRAINAGE AND �7 1545.01 REV. NO. DESCRIPTION BY CHECKED DATE JRE/SLM SLM JRE GRADING PLAN &STREET IMPROVEMENTS 9054 ),5 King County 0061) 'a 172 _ is=. as?e�g-07 >3 r ry^,,- ! I JI �� L7 ` 0 6l'J '90?� � . £ i1065 �.09 h'!lii?h'! .ill `I�` ��.: 0l"? If; i 01 4r;; 9924 � 1l 0-9,I 5 LL J' 1 .4042 i Ll i I I`lr� j_i w4 - 90 � £� n011 L i7 7?il I"10 ; C ��+ i R 9, 63 0519 r S 35 is St 00 30 _4 i )1t3 40 r?2gr ?I�� 9148 t 7� If " 11I J i ri T Id i!�r� 9046 1 I��� i I_! J�1_!�i�• let 1.� J002� '=�i ' 19 9128 i hit ih] i I I Li % i T 9003 �7 The infornalion included on this crap has been compiled by King County staff from a varietyof sources and is subject to change without notice. King County makes no representations or warranties, express or implied, King County as to accuracy, completeness, limeliness, or nghls to the use of such information. This documenlis not intended or use as a survey product, King County shall not be liable for any general, special, indirect, incidental, or consequential damages including, but not linited to, lost revenues or lost profits resulting from the use or misuse of GIS CENTER the information contained on this map. Any sale of thsmap or information on this map is prohibited except by wn¢en permission of King County. Date: 3/19/2018 0020 Jeffrey E. Hamilton Federal Way RI; LEC 15 Lake Bellevue C3 ive; Suite 102 Bellevue, WA 98005 (Sp. 0100629000642 --"cHjC GO TITLE EAS .912010 this line for recorder's use only) DOCUMENT TITLE: Easempt.for Stormwater Cul': r "Facility REFERENCE NUMBER(S) OF RELATED DOCUMENTS: Additional reference numbers on page(s) nla of document. GRANTOR: ;' < Federal Way RI,::I,LC GRANTEE; Lakehaven Utility Distric,;, a municipal corporation of King County, Washington. - ABBREVIATED LEGAL DESCRIPTION:' PORS SWQ SEQ SECTION 20-21-4 Additional :legal on Exh-i itA of d6cument. ASSESSOR'S TAX, PARCEL A'' NOS. 202104-9027 EASEMENT FOR STORMWATER CULVERT FACILITY THIS AGREEMENT by and between i alcehaven Utility District, a municipal corporation at"King Cotin#y, Washington, its successors, agents, designees or assigns, hereinafter termed "Grantee" 'and, Federal Way Rf LLC'and its successors, agents, designees or assigns, hereinafter termed "Grantor". WITNESSETH:.- That Grantor, far and in consideration of.6ne Dcallar ($1.00) or other valuable consideration, the receipt of which is hereby #kngai►+ledge'd, hereby conveys:to the Grantee: A perpetual, non-exclusive easement. and right -of --way, hereinafter termed "easement," for the construction, location, repair and/or replacernent:of a box culvert;.assoc iated headwalls and all necessary appurtenances related thereto, hereinafter termed "Grantee's facilities," through, over and across the real property described in Exhibit' A," attached hereto. -,and incorporated herein by reference. The location of said easement shall be as described in txh0it " 8,": and as depicted in Exhibit "C," both of which are attached hereto and incorporated herein by reference.: The Grantor and Grantee hereby covenant Sntd agree to the following terms, provisions and conditions: - Grantee shag have the right at such time as Grantee deems neeossary.,.without prior institution of any suit or proceediaig at. law and without prior notice to Grantor, to install, repair; rec'onstruet, operate and/or.rnainta'tn Grantee''s facilities within said easement, and to enter upon"said real. property described in Exhibit "A" for the purposes described herein, without incurring any legal obligation or liability therefore, provided that such shall be accomplished in such manner that existing private improvements shall not be disturbed or destroyed, ecept as provided hereunder. Grantor hereby agrees that, except as may be approved by Grantee in writing(which approval shall not be unreasonably withhefd.), no,bi ]Iding wa(l-1, fence, rockery, tree or structure of any kind shall be erected or planted, and no -fill rnatarial shall. be -:placed, within said easement. Grantor further agrees that no excavation shall be' i6ade :witb.in three feet (3'.) of Grantee's facilities and that the level of the ground surface within said easement shaft& maintained at.the elevation existing at the time said facilities were installed, except for temporary disturbances got affecting Grantee's facilities. Grantor agrees to remove any such encroachment as direeted by, Grantee.. If Grantor fails to, remove such encroachment, Grantee may remove the encroachment at Grantor's- cost. and without liability.to Grantee. Failure of Grantee to so exercise its right to require re(noval oaf any such encroachment shall neither constitute waiver of this right, nor preclude other remedies avai)abfe-to the Ga•antee. _ The use of this easement is not exclusive to the Grantee but may be used by the,Grantor, his'purchasers.nr.._ renters, the Power Company and its customers for all purposes not inconsistent'wlth the rights conveyed' to Grantee hereunder. Project Name 2010 Weil 15115A Culvert Crossing Agr/Pro, # 5100039 Easement No. J/12-1027 Form 1u6ciive 10/10/05 Grantor hcre§y grants to the Grantee the use of such additional area immediately adjacent to said easement as shall be rcasonat ly required Tor installation, repair, reconstruction, operation and/or maintenance of.-Grantce's facilities. iv'ithin. said easement. The right to use such additional area for the initial construc.tion shall expire on the earlier of -'the date of completion of the facilities or December 31, 2010. The Grantee agrees that any existing . 'improvements on said real property that neither encroach upon, nor conflict with, the rights conveyed to Grantee as set forth herein, that may be disturbed or destroyed by Grantee's facilities, or Grantee's activities -related to such facilities, will be replaced, repaired, or otherwise restored as reasonably practicable; Yo the pre -event cogdition by and at Grantee's expense. This Agreement and each of the tgms, provisions, conditions and covenants herein shall be binding upon and apply to the benefit of- the: parties hereto and their respective successors, agents, designees, or assigns. DATED this day of C11J By Jeffrey E. Hamilton, CFO of Federal Way R1, LLC Project Name 2010 Well 15/15A Culvert Crossing Agr/Praj # 5100039 Form ,Effective 10/10/05 STATE 'OF WASHINGTON } Easement No. J/12-1027 ss County of I certify that I [glow or.l ave satisfactory evidence that _ ZlArc:'k E 4" i l*zn signed this instrument and ackno dined it to be �— free and voluntary act for the Uses and purposes mentioned`in the instrumert. DATED: Njiffi`Fubk l � woINVON � All I _pl fi{p M Feb .10, 2014 1 For recording in the State of Washington, the Notarial Seal:must be fully legible and cannot intrude inter -- document margins. Please affix -seal in the space provided. Nota P 6lic . ca Title My appointment expires -G:a1 Project .Namc 2010 Well 151E 5A Culvert Crossing Agr/Proj # 510003.9 Easement No. J112-1027 Farn7:2f 1gctivc 1011-0105 EXHIBIT "A" Le of Propeft D6 i tigp {PER STAT.UTORY:WARRAIVTYDEEp RECORDEDJ'UNDER RECORDING NUMBER 20071127001267, RECORDS OF KING COUN_rY, WASHINGTON.) PARCEL 1: THAT PORTION OF THE SOUTH 147.7 FEET OF THE NORTHEAST QUARTER OF THE SOUTHWEST QUARTER OF THE SOUTHEAST QUARTER OF SECTION 20;TOW NSHIP 21 NORTH, RANGE 4 EAST, WILLAMETTE MERIDIAN, IN ICING COUNTY,. WASHINGTOIN, LYING WEST OF PACIFIC HIGHWAY SOUTH,• EXCEPT THAT PORTION THEREOF DESCRIBED AS FOLLOWS: BEGINNING AT THE NORTHWEST CORNER OF SAID SUBDIVISION; THENCE SOUTH 89' 34' 47" EAST, 643.69 FEET TO THE WESTERLY MARGIN OF SAID'PACIFIC HIGHWAY SOUTH; THENCE SOUTH 21' 50'33" WESTALONG SAID MARGIN, 40.42`FEET,• THENCE NORTH 95' 07` 16" WEST, 629.93 FEET TO THE POIIHT OF BEGINNING, " PARCEL 2: THAT PORTION OF THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE.SOUTHEAST QUARTER OF SECTION 20,TOWNSHIP'1I WORTH, RANGE 4 FAST, WILLAMETTE MERIDIAN, IN KING COUNTY, WASHINGTON;'LYING WEST OF PACIFIC HIGHWAY SOUTH: EXCEPT" THE FOLLOWING -DESCRIBED TRACT: BEGINNING A THE INTERSECTION OF THE WESTERLY MARGIN OF SAID PACIFIC HIGHWAY SOUTH AND THE SOUTH LIME OF SAID TRACT; THENCE NORTH 21' 02' 00" EAS•T 241 FEET, THENCE NORTH 59' 42' 0.0" WEST 221.3 FEET .. THENCE SOUTH 21- 02' 00" WEST, 357.3 FEET TO THE SOUTH -LINE OF SAID TRACT THENCE EAST 232.9 FEETALONG THE'SOUTH LINE TO THE POINT OF BEGINNING; AND EXCEPT THE FOLLOWING DESCRIBED. PROPERTY.-. BEGINNING AT THE SOUTHWEST CORNER OF SAID TRACT, - THENCE NORTH 00'09' 56"EASTALONG THE WESTLINE THEREOF., 52a.19 FRET• THENCE SOUTH 89' 44' 00" EAST PARALLEL WITH rHE NORTH LAVE OF SAID SOUTH HALF OF THE SOUTHWEST QUARTER OF THE SOUTHEAST QUARTER; 372.28 FEET TO THE TRUE POINT OF BEGINNING, THENCE NORTH 00*16' 00" EAST 25 FEET, THENCE SOUTH 89.44' 00" EAST, 200.00 FEET,' THENCE SOUTH 00'16' 00" WEST, 250.00 FEET, THENCE NORTH 89' 44' 00" WEST, 200.00 FEET, THENCE NORTH 00'16' 00" EAST, 225.00 FEET TO THE TRUE POINT OF BEGINNING; Project N1ame 2010 Well 15/15A Culvert Crossing Agr/Prbj.## 5100039 Easement No. J/12-1027 Form £ffcclirc I Oi1P0/05 EXHIBIT • '�eSCit]CTL[ �1'SCs:1pt10rY PARCEL N6. 202104-9027 WELL 15/15A CULVERT CROSSING EASEMENT THAT PORTION OF THE HEREINAFTER DESCRIBED PARCEL A"DESCRIBED AS FOLLOWS. BEGINNING AT THE SOUTHWEST CORNER OF SAID -PARCEL -A-, THENCE NORTH 00'09' 56" EASTALONG rHE WEST LINE THEREOF,52S 19 FEET.• THENCE SOUTH 69' 44' 00" EAST, 562.2'8 FEET. THENCE NORTH 00' 16' 00" EAST 10.00 FEET,' THENCE SOUTH.89' 44' 00" EAST, 10.00 FEET TO POINT `A"• THENCE NORTH 00' 16' 00" EAST 10.00 FEET TO THE NORTH -MARGIN OF THAT EASEMENT AS DESCRIBED UNDER RECORDING NUMBER 5811223, RECORDS OF KING MOITY, WASNINGTON; THENCE SOUTH 89' 44' 00" EASTALONG SAID MARGIN, 19.69 FEET TO THE TRUE'POINT OF BEGINNING; THENCE NORTH 82' 04' 25" EAST, 25.76 FEET,• THENCE SOUTH 4r 31' 40" EAST 45.35 FEET,' THENCE SOUTH 48° 58' 56" WEST, 13.32 FEET TO THE NORTHEASTERLY MARGIN OF SAID EASEMENT, THENCE NORTH 55' 16" 32" WESTALONG SAID NORTHEASTERLY MARGIN, 60.78 FEET TO•THE TRUE POINT OF BEGINNING, TOGETHER WITH• THE FOLLOWINGPESCR 9ED PORTION: BEGINNING -Ar THE AFOREMENTIONED POINT ,,A , THENCE SOUTH 00' 16' 00" WEST, 10.00 FEET TO THE SOUTH MARGIN. OF THAT EASEMENTAS DESCRIBED UNDER RECORDING NUMBER 5811223, RECORDS OF KING COUNTY, WASHINGTON; TO THE TRUE POINT OF BEGINNING; THENCE SOUTH 89' 44' 00" EAST ALONG SAID IWARGIN, 12.90 FEET: THENCE SOUTH 55' 16' 32"EAST.ALOJ1G THE SOUTHWESTERLY MARGIN OF SAID EASEMENT, 49.50 FEET - THENCE SOUTH 48' 58' 56- WEST, 31.77 FEET, . THENCE NORTH 43' 11' 07" WEST 43.39.FEET •TO THE EAST LINE 'OF .THAT PARCEL AS DESCRIBED UNDER RECORDING NUMBER 5811223, RECORDS 0E-,K1NG COUNTY, WASHINGTON: THENCE NORTH 00' 16, 00" EASTALONG SA16 EASTVNE, :17.47 FEET TO THE7RUE POINT OF BEGINNING. CONTAINING 2,168 SQUARE FEET, MORE OR LESS PARCEL "A" (PER STATUTORY WARRANTY DEED RECORDED UNDER RECORDING NUMBER 200142270012'67, RECORDS OF KING COUNTY, WASHINGTON.) Project Name 2010 Well 15/15A Culvert Crossing Agr/PF01#, 5100039 Form EfTective 10AD/05 PARCEL 1: THA T PORTION:OF THI; .SOUTH 147.7 FEET QF THE NORTHEAST QUARTER OF THE SOUTHWEST QUARTER`OF.THE SOr)THEAS7"QVARTER'0F SE.C,T10N 20,TOWNSHIP 21 NORTH, RANGE 4 EAST WILLAMETTE MERIDIAN, !A I ICING COUNTY;. WASHINGTON, LYING WEST OF PACIFIC HIGHWAY SOUTH; EXCEPT THAT PORTION THEREOF DESCRIBED AS FOLLOWS: BEGINNING AT THE NORTHWEST CORNER OF SAID SUBDIVISION,, THENCE SOUTH 89' 34' 47" EAST, 643.69 FEET TO THE WESTERLY MARGIN OF SAID PACIFIC HIGHWAY SOUTH; THENCE SOUTH 21' 50' 33" WEST ALONG SAID MARGIN, 40'.k FEET,• THENCE NORTH 86' 07' 16" wor, 629.93 FEET'tO THi~ POINT OF BEGINNING; PARCEL 2: Easement No. J/12-1027 THATPORTION OF THE SOUTH HALF OF THE SOUTHWEST QUARTER OF THE SOUTHEAST QUARTER OF SECTION•20 TOWNSHIP 21 NORTH, RANGE 4 EAST mi-AMETTE MERIDIAN, IN 1CING'COUNTY; WASHINGTaN, LYING WEST OF PACIFIC HIGHWAY SOUTk- EXCEPT'THE FOLLOWING DESCRIBED TRACT.- BEGINNING AT THE INTERSECTION OF THE WESTERLY MARGIN OF SA16 PACIFIC H1G14WAY'SOUTH AND THE SOUTH LINE OF SAID TRACT,' - THENCE NORTH 214 02' 00" EAST 241 FEET.• THENCE NORTH 59' 42' 00" WEST, 221.3 FEET' THENCE SOUTH 21•1 02' 00"•WE•ST, 357.3 FEET TO THE SOUTH LINE OF SAID TRACT,• THENCE I=AST,,,232.9'FEF7'ALONG THE SG UTH LINE TO THE POINT OF BEGINNING. AND EXCEPT THE FOLLOWING DESCRIBED PROPERTY. - BEGINNING AT THE SOUTHWEST CORNER OF SAID.`rRACT; THENCE NORTH 00"09' 56"'FAST ALONG THE WEST LINE THEREOF, 525.19 FEET THENCE SOUTH 89' 44' 00" EAST PARALLEL WITH THEWORT4 LINE OF SAID SOUTH HALF OF THE SOUTHWEST QUARTER OF THE SOUTH&ST QUARTER, 372.28 FEET TO THE TRUE POINT OF BEGINNING, THENCE NORTH 00.16' 00" EAST, 25 FEET" THENCE SOUTH 89' 44' 00" EAST, 200.00 FEET THENCE SOUTH 00'16' 00" WEST, 250.00 FEET•.•. THENCE NORTH $9' 44' 00" WEST, 200.00 FEET,; THENCE NORTH 00*16' 00" EAST, 225.00 FEET TO THE TRUE POINT OF BEGINNING: Pr9ject Name 2010 Well 15/15A Culvert Crossing Agr/Proj # 5100039 Easement No. J/12-1027 F677n Effective t0•If0/05 -EXHIBIT «C99 Easement Qe ict•on Sc 1/4 SEC.- 20, 'T.:2,1 N., R. 4 E.. W.M. NORTHEAST CORNER PARCEL 202704-9737 TAX LOT NUMBER 202104-0027 PROA 'R 7Y-L)"r . . .. TPOB 25.76' . ESMr l" i 9.09 .3877223 g T.S. N'16O'OO E i 70.00N. " S89'44'00"E 00 g POINT "A t . a 12.90" 362.26' rPas B' fAX LOT NUJitBirR`- �+j 20�704•-973i MT A A ,a 7,33�7 S. rO ZV PROPERTY LINE . TOTAL EASEMENT .:AREA 2.160 S.F.t PC& SOUTHWEST CORNER PARCEL A- (20270449027) . PROPERTY L7N£ MAY 27. 2070 - 20.R704-9027 E5MY.dwg K.� jf C,XHISI T C PARCEL 2021•04=9027 WELL 15/15A CULVERT CROSSING EASEMEN T.: RESUBMITTED NOV 0 7 2018 MASTER LAND USE APPLICATION r,rry OF FEDERAL WAY DEPARTMrNT OF CONJAWNrn° DEVELOPMENT DOMMUN(1'Y DEVELOPMENT 33325 8°i Avenue South Federal Way, WA 98003-6325 Federal Wa 253-835-2607; Fax 253-835-2609 APPLICATION NO(S) . t4W *0-- 0 4nr�UPD ate Project Name Federal Property Address/Location Tilt 348 1019 South 351st Street Parcel Number(s) 202104-9027 Project Description Construction of new office/warehouse building and associated site work improvements. rlury r ---------------------, Boundary line adjustment will be processed as part of the proposed developmartt An administrative - ---- ---- - --- -- - ---- ----------------------- ,---------- - ------------------ variance to address front yard setback will also be processed. . ------------------------------------------------------------------------- Type of Permit Required Annexation Binding Site Plan _ Boundary Line Adjustment Comp Plan/Rezone Land Surface Modification Lot Line Elimination Preapplication Conference Process I (Director's Approval) Process II (Site Plan Review) X Process III (Project Approval) Process IV (Hearing Examiner's Decision) T Process V (Quasi -Judicial Rezone) Process VI X SEPA w/Project _ SEPA Only _ Shoreline: Variance/Conditional Use Short Subdivision Subdivision _ _ X Variance: Commercial/Residential '_r. 11 /5/2018 Required Information CE - Commercial Enterprise "Zoning Designation Commercial Enteroise Comprehensive Plan Designation $1.000 Value of Existing Improvements Value of Proposed Improvements Mlernatiwtnl Building Code (IBC): S-1 Witt'. B Accessory _Oecupany-Type- 1118 Construction Type Applicant Narne: Brian Mattson, Panattoni Development Address: 900 S.W. 16th Street, Suite 330 City/State: Renton, WA Zip: 98057 Phone: (206) 838-6182 Fax: (206)442-1871 Email: bmattson@panationi.co Signature Agent (if different than Applicant) Name: Dan Balmelli, Barghausen Consulting Engineers Address: 18215-72nd Avenue South City/State: Kent, WA Zip: 98032 Phone: (425) 251-6222 Fax -Cell: (206) 396-8588 Email: dbalmelli@barghausen.com Signature: Owner Name: Federal Way RI, LLC Address: 15 Lake Bellevue Drive, Suite 102 City/State: Bellevue, WA Zip: 98005 Phone: Fax: Email: Signature: Bulletin #003 —January 1, 2011 Page I of 1 k:\HandoutslMaster Land Use Application �pHIL 38375 TECHNICAL INFORMATION REPORT Proposed Federal Way Tilt 348 Development * 1110512018 1019 South 351 st Street Federal Way, WA 98003 Prepared for: Panattoni Development Company 900 SW 16th Street, Suite 330 Renton, WA 98057 c/o Brian Mattson November 5, 2018 Our Job No. 18943 RESUBMITTED Nov a 7 2018 CITY OF FEDERAL WAY & t4 AV COMMUNITY DEVELOPMENT. 4 �Tl t� R e 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX a ; BRANCH OFFICES ♦ TUMWATER, WA ♦ LONG BEACH, CA ♦ ROSEVILLE, CA ♦ SAN DIEGO, CA s� j k. �. www.barghausen.com TABLE OF CONTENTS 1.0 PROJECT OVERVIEW Figure 1 — Technical Information Report (TIR) Worksheet Figure 2 — Site Location Figure 3 — Drainage Basins, Subbasins, and Site Characteristics Figure 4 — Soils Map 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Analysis of the Nine Core Requirements 2.2 Analysis of the First Special Requirement 3.0 OFF -SITE ANALYSIS 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology B. Developed Site Hydrology C. Performance Standards D. Flow Control System E. Water Quality System 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 6.0 SPECIAL REPORTS AND STUDIES 7.0 OTHER PERMITS 8.0 ESC ANALYSIS AND DESIGN 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 10.0 OPERATIONS AND MAINTENANCE MANUAL 18943.001 1.0 PROJECT OVERVIEW 1.0 PROJECT OVERVIEW This project is located on a 15.8-acre parcel within a portion of the Southeast quarter of Section 20, Township 21 North, Range 4 East, Willamette Meridian, City of Federal Way, King County, Washington. More particularly, the site is located at 1019 South 351st Street, Federal Way, WA 98003 on APN 202104-9027. The east half of the parcel that fronts Highway 99 will be developed while the west half will remain as is. There is also a rectangular parcel about 50,000 square feet residing within the subject property belonging to Lakehaven Water District and will not be a part of the proposed project. The existing site is mainly moderate to steep slopes with dense forest. There is an asphalt road onto the property that serves as access to the four existing single-family homes as well as the central parcel that is not a part of the project. The existing structures will be demolished but access to the separate parcel will be maintained. To the northwest of the proposed development, bisecting the property, there is a class 2S stream that stormwater runoff discharges to under existing conditions and will continue to do so with this development. Of the 15.8 acres, the disturbed area will be approximately 5.06 acres (220,630 square feet). The proposed condition for this site includes a building of 78,420 square feet (1.80 acres), 84,520 square feet (1.94 acres) of paving, a 19,855 square foot (0.46 acres) detention pond, and the remaining 37,462 square feet (0.86 acres) vegetated. This leaves the 5.06 acres of development approximately 74 percent hard surfaces, 9 percent pond area, and 17 percent landscaping and vegetation. For detention requirements, this site is required to provide Level 2, Conservation Flow Control as is required for all unincorporated areas of the King County Flow Control Map. This standard is matching the predeveloped durations of 50% of the 2-year up through the 50-year peak flows as well as matching peak discharge rate for the predeveloped 2-year and 10-year peak flows. For water quality, as this is a commercial site, Enhanced Basic water quality is required for all pollution generating surfaces. The stormwater runoff for this site will be detained and treated prior to discharge to the existing stream. A stormwater vault has been sized to detain all runoff from pollution generating surfaces, and a stormwater pond has been sized to detain the runoff from roof areas. The runoff from the stormwater vault will be treated by a Modular Wetland System, which has general use level designation (GULD) for enhanced treatment per the Department of Ecology (DOE). The pond discharge will not be treated, as runoff from the roof is considered non -pollution generating surface. 18943.001 a la [sill a 4S TECHNICAL INFORMATION REPORT (TIR) WORKSHEET KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Project Owner Panattoni Development Company Phone Address Project Engineer Costa Philippides Company Barghausen Consulting Engineers Phone 425-251-6222 Part 3 TYPE OF PERMIT APPLICATION ® Landuse (e.g.,Subdivision / Short Subd. / UPD) © Building (e.g.,M/F / Commercial / SFR) ❑ Clearing and Grading ❑ Right -of -Way Use ❑ Other Part 5 PLAN AND REPORT INFORMATION Technical Information Report ❑ Full Type of Drainage Review ❑ Targeted (check one): ❑ Simplified ❑ Large Project Date (include revision ❑ Directed dates): 2/12/18, 11/5/18 Date of Final: Part 2 PROJECT LOCATION AND DESCRIPTION Project Name Panattoni Federal Way DPER Permit # Location Township 21 N Range 04 E _ Section SE 1/4 of SEC 20 Site Address 1019 S 351 st Street Federal Way, WA 98003 Part4 OTHER REVIEWS AND PERMITS ❑ DFW HPA ❑ Shoreline ❑ ❑ ❑ ❑ COE 404 DOE Dam Safety FEMA Floodplain COE Wetlands Management 0 Structural Rockery/Vault/ El ESA Section 7 ❑ Other Site Improvement Plan (Engr. Plans) Plan Type (check ❑ Full one): ❑ Modified ❑ Simplified Date (include revision 2/12/18 11/5/18 dates): Date of Final: Part 6 SWDM ADJUSTMENT APPROVALS Type (circle one): Standard / Experimental / Blanket Description: (include conditions in TIR Section 2) N/A Approved Adjustment No. Date of Approval: 2016 Surface Water Design Manual 4/24/2016 1 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS Monitoring Required Start Date: Completion Date: _ Yes / No Describe: Re: KCSWDM Adjustment No. Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: N/A _ Special District Overlays: N/A Drainage Basin: Hylebos Creek Stormwater Requirements: Level 2 flow control,_ ehanced basic water quality Part 9 ONSITE AND ADJACENT SENSITIVE AREAS ❑ River/Stream Unnamed stream on property ❑ Steep Slope ❑ Lake ❑ Erosion Hazard _ ❑ Wetlands ❑ Landslide Hazard ❑ Closed Depression ❑ Coal Mine Hazard ❑ Floodplain ❑ Seismic Hazard ❑ Other ❑ Habitat Protection Part 10 SOILS Soil Type EwC - Everett Alder - wood gravelly sandy loam Sk - Seattle Muck Slopes 6-15% ❑ High Groundwater Table (within 5 feet) ❑ Other ❑ Additional Sheets Attached ❑ Sole Source Aquifer ❑ Seeps/Springs Erosion Potential 2016 Surface Water Design Manual 4/24/2016 2 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET I Part 11 DRAINAGE DESIGN LIMITATIONS REFERENCE Core 2 — Offsite Analysis ® Sensitive/Critical Areas Adjacent 2S stream ❑ SEPA ❑ LID Infeasibility ❑ Other Additional Sheets Attached LIMITATION / SITE CONSTRAINT Enhanced water quality provided Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Threshold Discharge Area: (name or description) Site (5.06 acres) Core Requirements (all 8 apply): Discharge at Natural Location Number of Natural Discharge Locations: 1 Offsite Analysis Level: I(D/ 2 / 3 dated: Flow Control (include facility Level: 1 /Q 3 or Exemption Number summary sheet) Flow Control BMPs Conveyance System Spill containment located at: Erosion and Sediment Control / CSWPP/CESCL/ESC Site Supervisor: Construction Stormwater Contact Phone: Pollution Prevention After Hours Phone: Maintenance and Operation Responsibility (circle one): Private / Public If Private, Maintenance Log Required: Es / No Financial Guarantees and Provided: Yes / No Liability Water Quality (include facility Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog summary sheet) or Exemption No. Landscape Management Plan: Yes / No Special Requirements (as applicable): Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fac. / one Requirements Name: Flood plain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None 100-year Base Flood Elevation (or range): Datum: Flood Protection Facilities Describe: N/A 2016 Surface Water Design Manual U 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet per Threshold Discharge Area) Source Control Describe land use: (commercial / industrial land use) Describe any structural controls: Oil Control High -use Site: Yes / No Treatment BMP: Maintenance Agreement: Yes / No with whom? Other Drainage Structures Describe: Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION 0 Clearing Limits 0 Stabilize exposed surfaces © Cover Measures ® Remove and restore Temporary ESC Facilities 0 Perimeter Protection ® Clean and remove all silt and debris, ensure a Traffic Area Stabilization operation of Permanent Facilities, restore 0 operation of Flow Control BMP Facilities as Sediment Retention necessary ❑ Surface Water Collection Flag limits of SAO and open space preservation ❑ Dewatering Control areas © Dust Control ❑ Other © Flow Control © Protection of Flow Control BMP Facilities (existing and proposed) 0 Maintain BMPs / Manage Project Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch) Flow Control Type/Description Water Quality Type/Description ❑ Detention ❑ Infiltration ❑ Regional Facility ❑ Shared Facility ❑ Flow Control BMPs ❑ Other Pond and Vault ❑ Vegetated Flowpath ❑ Wetpool ❑ Filtration ❑ Oil Control ❑ Spill Control ❑ Flow Control BMPs © Other Modular Wetland 2016 Surface Water Design Manual 4/24/2016 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS ❑ Drainage Easement 0 Cast in Place Vault ❑ Covenant 0 Retaining Wall ❑ Native Growth Protection Covenant L3 Rockery > 4' High ❑ Tract ❑ Structural on Steep Slope ❑ Other ❑ Other Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attached TechnicalInformationReport. To the best of my knowledge the information provided here is accurate. 1110512018 Signed/Date 2016 Surface Water Design Manual 4/24/2016 FIGURE 2 SITE LOCATION r S-340TH-ST-S 340TH ST- CA ., Kitts o COrnY 3dasr-P_= S 3415T:PL- lw� r --S 3.13RD -ST -Q� ij 5 3,24TH-5T 5-3114 T H SI ----- her Lake; r, nentary + 6TH-AVE S:- . L+ — - - St. Franos u Nospl tal q I y 72- 5-348Thl ST- 5 ?�:STH ST ��— ,8 I � Leg SITE # 5 west Hylebos — L 3.5NDST� Wetlands' .1 Park C.i QIT Hybelas Blueberry �. =5-356TH=5T=-•Farm Park . — - 5 35FTH $T —5 35 TTM-Si — iit Brookl,ake QLL Cllnstian � School �. o z -S-359TH ST v W =S-36OTH- a` S. T rudd Beattie _ High Sthooi �2 �4 S 364TH ST----- 0.5NvWAY -4b - 5:364TH PL _ REFERENCE: Rand McNally (2017) Scale: For. Job Number Horizontal: N.T.S. Vertical: N/A Panattoni Federal Way 18943 " 18215 72ND AVENUE SOUTH Federal Way, Washington KENT, WA 98032 (425) 251-6222 Title: @�. G (425) 251-8782 VICINITY MAP op' CIVIL ENGINEERING, LAND PLANNING, "'ro. enc106 SURVEYING, ENVIRONMENTAL SERVICES DATL 02/08/18 P:118000s1189431exhibitlgraphics118943 amap.cdr FIGURE 3 DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS DEVELOPED BASIN MAP 0 40 80 160 / w f�. ! �r_ ��''.�� � }`��11 r / I i I ' : � �" j i j i • =I -n - } � ! t i j + Y X S88'36'23"E 654.61' STORMWATER CUKRT EASEMENT. P�J 1 f_ / {' ,+l .' . r' r ' j' / :I REC. NO 20100629000642 h f fr r (ITEM 6) F�J a1.4 1r.:1. 1 •! 47r�rrr =i -c' 4l' ---�- - `'•� � � � / : �rA � f 1 ��E \L'� � �/ !1 { \ / =yam., DISTURBED AREA ' ri l 1 N 5.0.6.AC •�4urla^� sr.Ii: zt� J- � � ' / ` jjf+ i 1 / 1 1 �, 11 / NOT A PART i i EXISTING WETLAND 11111r PROPOSED PATHWAY c 0 CL Q w Q 0 CL 0 z Q w Q z w a ww °0 CL w LL U o° m o ~ LL z 4 N O 0 O Z411: O N z U En 2 U y Y ' 3 O O O U m U � ) \ o .�. Q = CD U Z> O (n g U) w x Z J H Z W Lam J Qr7 N N Z ' O N 00 0 00 N r� Z> p) CO 00 Z N Q I I I-- L!') Ll7 Zw U Z Ln �t--Lou7 w N Z N N Z J :co U U)) d AL T W 0 U CCN4 d T z L -0 00 1n T r CL z 0 Q 0 rn 0 N of 3 a w I a 0 .N m I 00 i iE L x M 7 rn 00 O 0 O FIGURE 4 SOILS MAP REFERENCE: USDA, Natural Resources Conservation Service LEGEND: EwC = Everett-Alderwood Gravelly Sandy Loams 6-15% slopes Sk = Seattle Muck Scale: Horizontal: N.T.S. Vertical: N/A R-Co14A V 18215 72ND AVENUE SOUTH �I S� KENT, WA 98032 ID Z (425) 251-6222 (425) 251-8782 �c •� Uy �' CIVIL ENGINEERING, LAND PLANNING, ( LNG Cf+C.�l:•��n SURVEYING, ENVIRONMENTAL SERVICES For Title: Panattoni Federal Way Federal Way, Washington SOIL SURVEY MAP Job Number 02/08/181 P:118000s1189431exhibitlgraphicsl18943 soil.cdr IL 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Analysis of the Eight Core Requirements Core Requirement No. 1: Discharge at the Natural Location. Response: This site currently drains into the class 2S stream that bisects the property. The proposed development will maintain this discharge to the stream. Core Requirement No. 2: Off -Site Analysis. Response: This project is submitting a Level 1 Downstream Analysis with this Technical Information Report, as required by King County. Core Requirement No. 3: Flow Control. Response: For flow control on this site, a detention pond and vault is proposed to meet Level 2 Flow Control as required for any unincorporated areas in the King County Flow Control Map. This is Conservative Flow Control, matching the predeveloped conditions for 50% of the 2-year up through the 50-year durations as well as the 2-year and 10-year peak flow rates. Core Requirement No. 4: Conveyance System. Response: As this development is less than 10 acres in size, the conveyance system is sized based on the Modified Rational Method utilizing a 25-year precipitation and a Manning's 'n' value of 0.014 for the pipes, all to provide a conservative sizing analysis and convey all flows generated from the project site during the peak storm event. Please see the following pages of this report for sizing calculations and basin map. Core Requirement No. 5: Erosion and Sediment Control. Response: This project is proposing to clear and grade the portion of the site to be developed and construct a building within the central portion of the site routing all runoff from the developed area into a sediment pond prior to infiltrating. There will be a silt fence around the entire perimeter of the site, along with a construction entrance installed from Highway 99. The clearing limits will be the property boundary to the north, south, and east limits with the stream buffer setback as the west limits. Temporary v-ditches with rock check dams routing stormwater to a temporary sediment pond will control erosion and sediment on site during construction. For further information please see the attached SWPPP and TESC plan. Core Requirement No. 6: Maintenance and Operations. Response: The Operations and Maintenance Manual will be prepared and included in the final stormwater site plan prepared for this development. The owner of the property, Panattoni Development Company is the party responsible for Operations and Maintenance of the stormwater facilities within the property Core Requirement No. 7. Financial Guarantees and Liability. Response: This project will conform to all financial guarantees and liabilities requirements King County and Federal Way requires for projects of this nature. 18943.001 a 2.2 Core Requirement No. 8: Water Quality. Response: The Water Quality Menu followed in accordance with the King County Surface Water Design Manual requires that Enhanced Basic Menu be the level of water quality treatment for this commercial development. A Modular Wetland System is being l proposed, which will provide enhanced treatment per the Department of Ecology. l Core Requirement No. 9: Flow Control BMPs. Response: Large Lot BMP Requirements 1. Full Dispersion - Full dispersion is infeasible because there is not enough native vegetated surface area that could be used for full dispersion. 2. Full Infiltration of Roof Runoff - At this time full infiltration of roof runoff is infeasible due to wetland impacts, however, additional geotechnical investigation is being completed. 3. One of following a. Full infiltration - At this time full infiltration is infeasible due to wetland impacts. Additional geotechnical information will be provided to determine if full infiltration is feasible for this project. b. Limited infiltration - At this time limited infiltration is infeasible due t wetland impacts. Additional geotechnical information will be provided t determine if limited or full infiltration is feasible for this project. c. Bioretention - Due to limited area on the project site, bioretention i infeasible. d. Permeable pavement - Permeable pavement is infeasible due to traffic loading and negative effects on groundwater quality. 4. Basic Dispersion - Due to the limited area on site, basic dispersion is infeasible. 5. One of following a. Reduced impervious surface credit - The listed techniques for reduced impervious surface credit do not apply to this project. b. Native growth retention credit - Although native area is being preserved much of this area is wetland and cannot count toward the native growth retention credit. 6. Soil Amendment - Lawn and landscaped areas will apply KCC 16.82.100(F). 7. Perforated Pipe Connection - Perforated pipe is infeasible because of the location to the buffer area and steep slopes. Analysis of the First Special Requirement Special Requirement No. 1: Other Adopted Area -Specific Requirements. Response: This project is located within the Hylebos Creek Drainage basin part of the Puyallup River Watershed. No area specific requirements are noted at this time. 18943.001 a 3.0 OFF -SITE ANALYSIS LEVEL 1 OFF -,SITE DRAINAGE ANALYSIS Proposed Federal Way Tilt 348 Development 1019 South 351 st Street Federal Way, WA 98003 Prepared for: Panattoni Development Company 900 SW 16th Street, Suite 330 Renton, WA 98057 c/o Brian Mattson June 29, 2018 Revised: November 2, 2018 Our Job No. 18943 CIVIL ENGINEERING, LAND PLANNING, SURVEYING 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES ♦ TUMWATER, WA ♦ LONG BEACH, CA ♦ ROSEVILLE, CA ♦ SAN DIEGO, CA www.barghausen.com TABLE OF CONTENTS TASK 1 STUDY AREA DEFINITION AND MAPS EXHIBIT A Vicinity Map EXHIBIT B Downstream Drainage Map EXHIBIT C Upstream Basin Map TASK 2 RESOURCE REVIEW EXHIBIT D FEMA Map EXHIBIT E Sensitive Areas Folios EXHIBIT F Soil Survey Map EXHIBIT G Assessor's Map TASK 3 FIELD INSPECTION 3.2 Downstream Drainage Problems Requiring Special Attention 3.1.1 Conveyance System Nuisance Problems (Type 1) 3.1.2 Severe Erosion Problems (Type 2) 3.1.3 Severe Flooding Problems (Type 3) 3.1.4 Potential Impacts to Wetland Hydrology Problem (Type 4) 3.2 Downstream Water Quality Problems Requiring Special Attention 3.2.1 Dissolved Oxygen (DO) Problem (Type 2) 3.2.2 Temperature Problem (Type 3) 3.2.3 High pH Problem (Type 7) TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS TASK 5 MITIGATION OF EXISTING OR POTENTIAL PROBLEMS 18943.002 TASK 1 STUDY AREA DEFINITION AND MAPS TASK 1 STUDY AREA DEFINITION AND MAPS This project is located on a 15.8-acre parcel within a portion of the Southeast quarter of Section 20, Township 21 North, Range 4 East, Willamette Meridian, City of Federal Way, King County, Washington. More particularly, the site is located at 1019 South 351st Street, Federal Way, WA 98003 on APN 202104-9027. The east half of the parcel that fronts Highway 99 will be developed while the west half will remain as is. There is also a rectangular parcel about 50,000 square feet residing within the subject property belonging to Lakehaven and will not be a part of the proposed project. The existing site has moderate to steep slopes with dense forest. There is an asphalt road onto the property that serves as access to the four existing single-family homes as well as the central parcel that is not a part of the project. The existing structures will be demolished, but access to the separate parcel will be maintained. To the northwest of the proposed development, bisecting the property, there is a class 2S stream that stormwater runoff discharges to under existing conditions and will continue to do so with this development. Of the 15.8 acres, the disturbed area will be approximately 5.06 acres (220,630 square feet). The proposed condition for this site includes a building of 78,420 square feet (1.80 acres), 84,520 square feet (1.94 acres) of paving, a 19,855 square foot (0.46 acres) detention pond, and the remaining 37,462 square feet (0.86 acres) vegetated. This leaves the 5.06 acres of development approximately 74 percent hard surfaces, 9 percent pond area, and 17 percent landscaping and vegetation. UPSTREAM DRAINAGE ANALYSIS Based on a site survey, it appears there is no upstream flow onto the site. The only upstream flows would be from other areas tributary to the stream on site, but this does not affect the proposed development. 18943.002 EXHIBIT A Vicinity Map h 0l Lake nentary SC �+nCe n 5-348TH !ST w. West Hylebos 4Nettands' Park H4'belos Blueberry S=356TH-ST=Farm Park 35 -rl;;' 1gpTll S7•S =1C,TH'ST K Itj"s � 7 S 3r.7S- 5.3415T PL-1'pl r w =•5 343 Rp •ST t r 9 SITE CJ +�Q 4 1 $rorikhake cht isiian Schroat S '`YIH 1 h ii;I5T PL fi rri Q 99 5. <6-rH ST -- - If REFERENCE: Rand McNally (2017) Scale: Horizontal: N.T.S. Vertical: N/A CyHA(� �%S% 18215 72ND AVENUE SOUTH Ir w►I� fi KENT, WA 98032 (425) 251-6222 s (425) 251-8782 4��►► r �a CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES For: Title: 4 T" 6eames High School ��+K1 WAY Panattoni Federal Way Federal Way, Washington VICINITY MAP S 360TH J 5 3G4TH-PL Job Number 18943 02/08/18 I P:• 18000s1189431exhibingraphics118943 amap.cdr EXHIBIT B ❑ownstream Drainage Map DOWNSTREAM DRAINAGE MAP I r` ENTIRE SITE JInJ( > (9 00 �] APPROXIMATE Q Apo DEVELOPED AREA (5.3 AC) J0 -112 Jr;I Ml 3 109 e bo s DOWNSTREAM r FLOWPATH (1/4 MILE) ar f `35205 CD / r ��J3 540 1 i a `35400 V r H e Os 26 Bfu er +;F rm '�57 3s5as� 1355 4 ` �' —.1 77 d �° ,e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a survey product. King County shall not be liable for any general, special, indirect, incidental, or consequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information on this map is prohibited except by written permission of King County. Date: 2/ 12/2018 Notes: 3S Oa `3 000 �---.14, 71 � 1r40915 5050 P 351D❑ `B 93 `13 51 220 D 61224 61200 M Vy N, 11 _ I N King County A GIS CENTER Legend Address points Address labels Parcels index contours - 100 foot contours - 5 foot (below 1000 feet) and 10 foot EXHIBIT C Upstream Basin Map PSTREAM J} I RAINAGE-`34G17 63' 634620 1� �918 V 22 V 1'ti 3 463 ON [�471009 914 �S I 111-10 �15 2 6901 `1015 'Di 15 `1109 1105, ENTIRE SITE n, -.\ ILA j' APPROXIMATE DEVELOPED AREA (5.3 AC) ,35 UPSTREAM BASIN MAP `346O'O • J `i f w34s• - r 634701 f' �34G21 18 r 34720 +• 61400 34G2 7 34624 3 4703 gp • '.16110 3 47- =34.7-13 � 406 �•1" -I lb34727�' �3 47.3. �� �1420 / �1�3.0 01506 61520 j34726 1688 5 348th St - 1348`19 f 015 07 1!6a 634814 �1401 �14T3 I V i 634900 34910 i3 4$17 1 f [� V f 43 49 Ifl t9 1-4 910 �3493�4j3W30 }34�02 � 834940— .34919: _349f-0 43495 635000 �l 5050 `35 025 S 351 d �s�1 *1351 `1393 35 05 3 i f r D r r � a information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a survey product. King County shall not be liable for any general, special, indirect, incidental, or consequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information on this map is prohibited except by written permission of King County. e5106 61 F Date: 2/ 12/2018 Notes: f3 5 1635100 LQ King County GIS CENTER Legend Address points Address labels Parcels — index contours - 100 foot contours - 5 foot (below 1000 feet) and 10 foot TASK 2 RESOURCE REVIEW TASK 2 RESOURCE REVIEW Adopted Basin Plans: The site is part of the Hylebos Creek Drainage Basin Finalized Drainage Studies: This is not applicable Basin Reconnaissance Summary Report: This site is located in the Hylebos Creek Drainage Basin. • Critical Drainage Area Maps: According to the King County Surface Water Design Manual, for the commercial developments, Enhanced Basic water quality is required for this project site. In addition, the King County Surface Water Design Manual also indicates that Level 2 Flow Control is required as a minimum. Floodplain and Floodway FEMA Maps: Please see the enclosed Exhibit D — FEMA Map utilized for this analysis. Based on our review of the FEMA floodplain map, the site is not located within the floodplain. • Other Off -Site Analysis Reports: The United State Department of Agriculture Soils Conservation Service (SCS) map is also provided. See Exhibit F — Soil Survey Map. • Sensitive Areas Folios: Based on a review of the King County Sensitive Areas Map Folios, a class 2S stream bisects the site. Stormwater runoff from the site currently discharges to this stream and will continue to do so under developed conditions. Drainage Problems: This is not applicable • United States Department of Agriculture King County Soils Survey: Based on the Soils Map for this area, the majority of the site area being developed is located within Everett-Alderwood gravelly sandy loam, while the remainder of the site is located within Seattle Muck. • Migrating River Studies: This is not applicable. Department of Ecology 303(d) Waters: A tributary stream to the Hylebos Creek in the project vicinity is considered a 303(d) listed water for temperature and dissolved oxygen. However mapping has not been done so it cannot be said for certain if this stream is part of that, or another tributary stream. 18943.002 EXHIBIT D FEMA Map a 11 2E LEGEND { , OTHER AREAS ZONE X Areas determined to be outside 500-year fioodplain REFERENCE: Federal Emergency Management Agency (Portion \o\f Map 53033C1250 F, May 1995) Scale: For. Job Number Horizontal: N.T.S. Vertical. N/A Panattoni Federal Way 18943 &HAUS18215 72ND AVENUE SOUTH Federal Way, Washington 4 nA VA KENT, WA 98032 R� y 7. (425) 251-6222 Title: n S (425) 251-8782 FEMA MAP CIVIL ENGINEERING, LAND PLANNING, {T�NC E/1GtK�E� SURVEYING, ENVIRONMENTAL SERVICES DATi 02�08�1$ P:ll8000s1189431exhibitlgraphicsl18943 fema.cdr Sensitive Areas Folios imp Legend Parcels class 1 ® Potential landslide hazard areas (2016, see explanation --- >) class 2 perennial ® Potential steep slope hazard areas (2016, see explanation --- >) — class 2 salmonid Erosion hazard (1990 SAO) - class 3 Seismic hazard (1990 SAO) • • • unclassified Coal mine hazard (1990 SAO) Wetland (1990 SAO) REFERENCE. King County WAP (2017) Scale: For. Job Number Horizontal: N.T.S. Vertical: N/A Panattoni Federal Way Federal Way, Washington 18943 ��yHA(/.S 18215 72ND AVENUE SOUTH q TV 0 KENT, WA 98032 Q],- 'Z (425) 251-6222 Title.- (425) 251-8782 SENSITIVE AREAS DATE: 02/08/18 4 �,� �' CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES MAP P:118000s1189431exhibitlgraphics118943 sens.cdr *AV4N1=1kAA Sail Survey Map REFERENCE: USDA, Natural Resources Conservation Service LEGEND: EwC = Everett-Alderwood Gravelly Sandy Loams 6-15% slopes Sk = Seattle Muck Scale: Horizontal: N.T.S. Vertical., N/A 4,G11A 18215 72ND AVENUE SOUTH 0 KENT, WA 98032 (425) 251-6222 P (425) 251-8782 ' CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES For Title: Panattoni Federal Way Federal Way, Washington SOIL SURVEY MAP Job Number 18943 02/08/181 P:118000s1189431exhibitlgraphics118943 soil.cdr WAC . WC Assessor's Map REFERENCE: King County Department of Assessments (Jan. 2018) Scale: For; Job Number Horizontal: N.T.S. Vertical. N/A Panattoni Federal Way Federal Way, Washington 18943 &HA V 18215 72ND AVENUE SOUTH �� n� KENT, WA 98032 Title: Z4 Z (425) 251-6222 (425) 251-8782 ASSESSOR MAP DAl (_: 02/08/18 V CIVIL ENGINEERING, LAND PLANNING, }'h`+ SURVEYING, ENVIRONMENTAL SERVICES ENGSHc�¢ P:118000s1189431exhibitlgraphics118943 amap.cdr TASK 3 FIELD INSPECTION TASK 3 FIELD INSPECTION A stream tributary to Hylebos Creek flows through the site, however due to the grades on site compared to the stream site flooding would not be an issue. There are no known problems with the existing storm system in Pacific Highway 99. 3.1 Downstream Drainage Problems Requiring Special Attention 3.1.1 Conveyance System Nuisance Problems (Type 1) Conveyance system nuisance problems are minor but chronic flooding or erosion problems that result from the overflow of a constructed conveyance system that is substandard or has become too small as a result of upstream development. Such problems warrant additional attention because of their chronic nature and because they result from the failure of a conveyance system to provide a minimum acceptable level of protection. Based on the resource review, there is little evidence of past conveyance system nuisance problems occurring. 3.1.2 Severe Erosion Problems (Type 2) Severe erosion problems are defined as downstream channels, ravines, or slopes with evidence of or potential for erosion/incision, sufficient to pose a sedimentation hazard to downstream conveyance systems or propose a landslide hazard by undercutting adjacent slopes. Severe erosion problems do not include roadway or minor ditch erosion. Based on our site visit, there is no evidence of, or potential for erosion/incision sufficient to pose a sedimentation hazard to downstream conveyance systems evident anywhere along the downstream drainage course. 3.1.3 Severe Flooding Problems (Type 3) Severe flooding problems can be caused by conveyance system overflows or the elevated water surfaces of ponds, lakes, wetlands, or closed depressions. Severe flooding problems are defined as follows: • Flooding of the finished area of a habitable building for runoff events less than or equal to the 100-year event. Examples include flooding of finished floors of homes and commercial or industrial buildings. Flooding in electrical/heating systems and components in the crawlspace or garage of a home. Such problems are referred to as "severe building flooding problems." • Flooding over all lanes of a roadway or severely impacting a sole access driveway for runoff events less than or equal to the 100-year event. Such problems are referred to as "severe roadway flooding problems." The site is not in the floodplain, nor is the stream through the site anticipated to flood to the level that would impact this site. 3.1.4 Potential Impacts to Wetland Hydrology Problem (Type 4) Potential impacts to wetlands hydrology can be caused by changes in the rate, duration, and quantity of stormwater discharged from the project site to a wetland. 18943.002 With this development the existing site drains to the stream/wetland area as it will continue to do so under developed conditions. 3.2 Downstream Water Quality Problems_ Requiring Special Attention 3.2.1 Dissolved Oxygen (DO) Problem (Type 2) The state has Hylebos Creek, and an unmapped stream in the project vicinity listed as a Category 5 303(d) listed water for dissolved oxygen. 3.2.2 Temperature Problem (Type 3) The state has Hylebos Creek, and an unmapped stream in the project vicinity listed as a Category 5 303(d) listed water for temperature. 3.2.3 High pH Problem (Type 7) The state has the Hylebos Creek, Western Fork listed as category 2 water for pH. 18943.002 TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS Runoff from the project site will be routed to an on -site conveyance system that will include a detention pond in combination with a detention vault, and a post -detention modular wetland before it is conveyed west to the previously mentioned stream onsite. Detention will be provided to comply with level 2 flow control, and water quality provided will comply with Enhanced Basic water quality. The stream is assumed to be a Category 5 303(d) listed water for dissolved oxygen and temperature as well as a Category 2 water for pH per the state listing. 18943.002 TASK 5 MITIGATION OF EXISTING AND POTENTIAL PROBLEMS TASK 5 MITIGATION OF EXISTING AND POTENTIAL PROBLEMS The area downstream of this proposed project does not exhibit any potential erosion problems. Since the 2016 King County Surface Water Design Manual indicated Enhanced Basic for water quality and Level 2 Flow Control as the required means of treating and detaining runoff, this project assumes that this is adequate for this site. With the temperature, and dissolved oxygen problems, and pH problem assumed for this site, additional mitigation methods will be used. For temperature, as a portion of the runoff will be detained in a detention vault, this runoff will be kept underground which will keep the water out of the sunlight that may potentially warm it. As for dissolved oxygen, the outfall will be kept as high as possible to provide a higher DO content and promote aeration of the water. As for pH issues, the concrete detention vault will have all submerged surfaces coated to prevent a change in pH due to the vault. Based on these mitigation methods, this project will neither aggravate nor create a problem as specified in the problem -specific mitigation requirements set forth in Section 1.2.2.1 of the 2016 King County Surface Water Design Manual as adopted by the City of Federal Way. 18943.002 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology The existing site drains to the stream and wetland that bisects the property. A majority of the land is moderate to steep slopes with dense forest. B. Developed Site Hydrology Under the developed conditions the site will be approximately 74 percent impervious surface. The developed site area is approximately 5.06 acres with water quality and flow control being provided for the site. The runoff from the roof area will be conveyed to a detention pond, and the runoff from pollution generating surfaces conveyed to a detention vault with enhanced water quality treatment post -detention. The pond and vault discharges will combine before discharging to the stream and wetland onsite. C. Performance Standards This site is located within the unincorporated area of King County for flow control and water quality purposes. Level 2 flow control is required as well as enhanced basic water quality standard. The Modified Rational Method utilizing the 25-year storm event is used for pipe conveyance, as the site is less than 10 acres. D. Flow Control System A detention pond and vault sized to provide level 2 flow control are proposed for this site. Roof runoff will bypass water quality and discharge directly into the detention pond through a separate storm system for clean roof runoff only. The runoff from pollution generating surfaces will be conveyed to a detention vault followed by a water quality device before combining with the pond release to be discharged to the stream that bisects the property. Please see the following pages for more specifics on the detention sizing. E. Water Quality System The water quality required for commercial developments is enhanced basic water quality treatment. This will be provided by a Modular Wetland, which has General Use Level Designation (GULD) per the DOE for enhanced treatment level. 18943.001 a DETENTION AND WQ SIZING CRITERIA FLOW CONTROL AND WATER QUALITY SIZING CRITERIA Site Areas Building = 78,420 SF - 1.80 Ac Pavement = 85,380 SF - 1.96 Ac Pond = 18,295 SF 0.42 Ac Landscape - 38,535 SF 0.88 Ac Total Disturbed Area = 220,630 SF - 5.06 Ac Area to Pond = 78,420 SF _ 1.80 Ac Area to Vault and WQ = 123,710 SF - 2.84 Ac WQ Flowrate = 0.06 cfs 18943.001 a DETENTION POND SIZING WWHM2012 PROJECT REPORT 18943 Federal Way Tilt Detention Pond for Roof Runoff 47,000 CF Detention 11 /2/2018 General Model Information Project Name: 18943-Pond Site Name: Panattoni Site Address: 1019 s 351 st st City: Federal Way Report Date: 11 /2/2018 Gage: Seatac Data Start: 1948/10/01 Data End: 2009/09/30 Timestep: 15 Minute Precip Scale: 1.000 Version Date: 2018/03/08 Version: 4.2.14 POC Thresholds Low Flow Threshold for POC1: 50 Percent of the 2 Year High Flow Threshold for POC1: 50 Year 18943-Pond 11/2/2018 10:21:57 AM Page 2 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Forest, Flat 0.6 C, Forest, Mod 0.6 C, Forest, Steep 0.6 Pervious Total 1.8 Impervious Land Use acre Impervious Total 0 Basin Total 1.8 Element Flows To: Surface Interflow Groundwater 18943-Pond 11 /2/2018 10:21:57 AM Page 3 Mitigated Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROOF TOPS FLAT 1.8 Impervious Total 1.8 Basin Total 1.8 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 18943-Pond 11 /2/2018 10:21:57 AM Page 4 Mitigated Routing Trapezoidal Pond Bottom Length: 'Bottom Width: Depth: Volume at riser head: Side slope 1: Side slope 2: Side slope 3: Side slope 4: Discharge Structure Riser Height: Riser Diameter: Orifice 1 Diameter: Orifice 2 Diameter: Orifice 3 Diameter: Element Flows To: Outlet 1 100.00 ft. 116.00 ft. 5 ft. 1.0800 acre-feet. 0 To 1 0 To 1 0 To 1 0 To 1 4 ft. 18 in. 0.87 in. Elevation:0 ft. 1.16 in. Elevation:2.868 ft. 2.14 in. Elevation:3.61291666666669 ft_ Outlet 2 Pond Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infilt(cfs) 0.0000 0.266 0.000 0.000 0.000 0.0556 0.266 0.014 0.004 0.000 0.1111 0.266 0.029 0.006 0.000 0.1667 0.266 0.044 0.008 0.000 0.2222 0.266 0.059 0.009 0.000 0.2778 0.266 0.074 0.010 0.000 0.3333 0.266 0.088 0.011 0.000 0.3889 0.266 0.103 0.012 0.000 0.4444 0.266 0.118 0.013 0.000 0.5000 0.266 0.133 0.014 0.000 0.5556 0.266 0.147 0.015 0.000 0.6111 0.266 0.162 0.016 0.000 0.6667 0.266 0.177 0.016 0.000 0.7222 0.266 0.192 0.017 0.000 0.7778 0.266 0.207 0.018 0.000 0.8333 0.266 0.221 0.018 0.000 0.8889 0.266 0.236 0.019 0.000 0.9444 0.266 0.251 0.020 0.000 1.0000 0.266 0.266 0.020 0.000 1.0556 0.266 0.281 0.021 0.000 1.1111 0.266 0.295 0.021 0.000 1.1667 0.266 0.310 0.022 0.000 1.2222 0.266 0.325 0.022 0.000 1.2778 0.266 0.340 0.023 0.000 1.3333 0.266 0.355 0.023 0.000 1.3889 0.266 0.369 0.024 0.000 1.4444 0.266 0.384 0.024 0.000 1.5000 0.266 0.399 0.025 0.000 1.5556 0.266 0.414 0.025 0.000 1.6111 0.266 0.429 0.026 0.000 1.6667 0.266 0.443 0.026 0.000 1.7222 0.266 0.458 0.027 0.000 1.7778 0.266 0.473 0.027 0.000 18943-Pond 11 /2/2018 10:21:57 AM Page 6 1.8333 0.266 0.488 0.027 0.000 1.8889 0.266 0.503 0.028 0.000 1.9444 0.266 0.517 0.028 0.000 2.0000 0.266 0.532 0.029 0.000 2.0556 0.266 0.547 0.029 0.000 2.1111 0.266 0.562 0.029 0.000 2.1667 0.266 0.577 0.030 0.000 2.2222 0.266 0.591 0.030 0.000 2.2778 0.266 0.606 0.031 0.000 2.3333 0.266 0.621 0.031 0.000 2.3889 0.266 0.636 0.031 0.000 2.4444 0.266 0.651 0.032 0.000 2.5000 0.266 0.665 0.032 0.000 2.5556 0.266 0.680 0.032 0.000 2.6111 0.266 0.695 0.033 0.000 2.6667 0.266 0.710 0.033 0.000 2.7222 0.266 0.724 0.033 0.000 2.7778 0.266 0.739 0.034 0.000 2.8333 0.266 0.754 0.034 0.000 2.8889 0.266 0.769 0.040 0.000 2.9444 0.266 0.784 0.045 0.000 3.0000 0.266 0.798 0.048 0.000 3.0556 0.266 0.813 0.051 0.000 3.1111 0.266 0.828 0.054 0.000 3.1667 0.266 0.843 0.056 0.000 3.2222 0.266 0.858 0.058 0.000 3.2778 0.266 0.872 0.060 0.000 3.3333 0.266 0.887 0.062 0.000 3.3889 0.266 0.902 0.064 0.000 ` 3.4444 0.266 0.917 0.065 0.000 3.5000 0.266 0.932 0.067 0.000 3.5556 0.266 0.946 0.069 0.000 3.6111 0.266 0.961 0.070 0.000 3.6667 0.266 0.976 0.100 0.000 3.7222 0.266 0.991 0.114 0.000 3.7778 0.266 1.006 0.125 0.000 3.8333 0.266 1.020 0.134 0.000 3.8889 0.266 1.035 0.142 0.000 3.9444 0.266 1.050 0.150 0.000 4.0000 0.266 1.065 0.157 0.000 4.0556 0.266 1.080 0.372 0.000 4.1111 0.266 1.094 0.757 0.000 4.1667 0.266 1.109 1.250 0.000 4.2222 0.266 1.124 1.818 0.000 4.2778 0.266 1.139 2.436 0.000 4.3333 0.266 1.154 3.075 0.000 4.3889 0.266 1.168 3.707 0.000 4.4444 0.266 1.183 4.306 0.000 4.5000 0.266 1.198 4.846 0.000 4.5556 0.266 1.213 5.309 0.000 4.6111 0.266 1.227 5.684 0.000 4.6667 0.266 1.242 5.975 0.000 4.7222 0.266 1.257 6.200 0.000 4.7778 0.266 1.272 6.479 0.000 4.8333 0.266 1.287 6.702 0.000 4.8889 0.266 1.301 6.919 0.000 4.9444 0.266 1.316 7.128 0.000 5.0000 0.266 1.331 7.332 0.000 18943-Pond 11/2/2018 10:21:57 AM Page 7 5.0556 0.266 1.346 7.530 0.000 18943-Pond 11 /2/2018 10:21:57 AM Page 8 Analysis Results POC 1 017 m os� U 010 Q IL 007 Ja� ' _ c i 1OE M 10E-4 10E-3 10E-2 10E-1 n 1 100 Percent Time Exceeding + Predeveloped Predeveloped Landuse Totals for POC #1 � ° - Cumulative PrababilAy a oo� ' 05 1 2 5 10 296 1H M 13 t.' 95 N " 995 x Mitigated Total Pervious Area: 1.8 Total Impervious Area: 0 Mitigated Landuse Totals for POC #1 Total Pervious Area: 0 Total Impervious Area: 1.8 Flow Frequency Method: Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.061841 5 year 0.099574 10 year 0.123542 25 year 0.151834 50 year 0.171315 100 year 0.189438 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.027736 5 year 0.034573 10 year 0.039454 25 year 0.04603 50 year 0.051231 100 year 0.056699 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.068 0.024 1950 0.079 0.028 1951 0.130 0.047 1952 0.044 0.021 1953 0.035 0.028 1954 0.050 0.025 1955 0.087 0.025 1956 0.068 0.032 1957 0.058 0.025 1958 0.061 0.027 U4 18943-Pond 11 /2/2018 10:21:57 AM Page 9 1959 0.051 0.024 1960 0.092 0.033 1961 0.050 0.029 1962 0.033 0.022 1963 0.045 0.027 1964 0.059 0.029 1965 0.042 0.031 1966 0.040 0.026 1967 0.091 0.029 1968 0.052 0.026 1969 0.053 0.025 1970 0.045 0.027 1971 0.048 0.027 1972 0.101 0.034 1973 0.047 0.031 1974 0.049 0.026 1975 0.072 0.024 1976 0.050 0.026 1977 0.007 0.023 1978 0.045 0.028 1979 0.026 0.020 1980 0.112 0.047 1981 0.038 0.026 1982 0.084 0.032 1983 0.066 0.026 1984 0.043 0.022 1985 0.024 0.023 1986 0.108 0.029 1987 0.095 0.032 1988 0.039 0.025 1989 0.024 0.023 1990 0.210 0.033 1991 0.118 0.034 1992 0.049 0.028 1993 0.048 0.022 1994 0.016 0.020 1995 0.065 0.030 1996 0.146 0.040 1997 0.122 0.060 1998 0.033 0.022 1999 0.117 0.038 2000 0.049 0.029 2001 0.010 0.019 2002 0.055 0.029 2003 0.076 0.025 2004 0.098 0.050 2005 0.068 0.025 2006 0.073 0.033 2007 0.157 0.063 2008 0.202 0.034 2009 0.095 0.030 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.2098 0.0633 2 0.2025 0.0596 3 0.1572 0.0498 18943-Pond 11 /2/2018 10:22:33 AM Page 10 4 0.1456 0.0466 5 0.1303 0.0466 6 0.1220 0.0397 7 0.1176 0.0382 8 0.1172 0.0342 9 0.1116 0.0337 10 0.1084 0.0336 11 0.1005 0.0331 12 0.0984 0.0328 13 0.0953 0.0325 14 0.0951 0.0324 15 0.0920 0.0321 16 0.0909 0.0320 17 0.0869 0.0308 18 0.0839 0.0305 19 0.0788 0.0304 20 0.0757 0.0296 21 0.0729 0.0295 22 0.0720 0.0294 23 0.0680 0.0294 24 0.0678 0.0287 25 0.0675 0.0286 26 0.0660 0.0286 27 0.0647 0.0284 28 0.0609 0.0282 29 0.0590 0.0279 30 0.0579 0.0277 31 0.0550 0.0272 32 0.0526 0.0270 33 0.0522 0.0270 34 0.0510 0.0269 35 0.0504 0.0261 36 0.0501 0.0261 37 0.0498 0.0261 38 0.0494 0.0259 39 0.0494 0.0258 40 0.0486 0.0258 41 0.0482 0.0255 42 0.0477 0.0253 43 0.0471 0.0251 44 0.0450 0.0251 45 0.0448 0.0251 46 0.0446 0.0249 47 0.0440 0.0249 48 0.0426 0.0245 49 0.0419 0.0244 50 0.0398 0.0236 51 0.0389 0.0232 52 0.0380 0.0231 53 0.0346 0.0231 54 0.0334 0.0223 55 0.0330 0.0221 56 0.0256 0.0218 57 0.0244 0.0217 58 0.0237 0.0213 59 0.0163 0.0201 60 0.0096 0.0199 61 0.0074 0.0189 18943-Pond 11 /2/2018 10:22:33 AM Page 11 Duration Flows The Facility PASSED Flow(cfs) Predev Mit Percentage Pass/Fail 0.0309 14452 6211 42 Pass 0.0323 13195 3717 28 Pass 0.0338 12033 2227 18 Pass 0.0352 10987 1341 12 Pass 0.0366 10021 1239 12 Pass 0.0380 9109 1145 12 Pass 0.0394 8359 1043 12 Pass 0.0408 7683 952 12 Pass 0.0423 7065 864 12 Pass 0.0437 6506 779 11 Pass 0.0451 6021 690 11 Pass 0.0465 5568 577 10 Pass 0.0479 5148 522 10 Pass 0.0494 4753 447 9 Pass 0.0508 4408 388 8 Pass 0.0522 4096 331 8 Pass 0.0536 3803 280 7 Pass 0.0550 3542 243 6 Pass 0.0564 3309 188 5 Pass 0.0579 3106 154 4 Pass 0.0593 2902 130 4 Pass 0.0607 2714 110 4 Pass 0.0621 2558 75 2 Pass 0.0635 2368 0 0 Pass 0.0650 2194 0 0 Pass 0.0664 2014 0 0 Pass 0.0678 1852 0 0 Pass 0.0692 1727 0 0 Pass 0.0706 1590 0 0 Pass 0.0720 1481 0 0 Pass 0.0735 1362 0 0 Pass 0.0749 1251 0 0 Pass 0.0763 1143 0 0 Pass 0.0777 1070 0 0 Pass 0.0791 1010 0 0 Pass 0.0806 960 0 0 Pass 0.0820 914 0 0 Pass 0.0834 873 0 0 Pass 0.0848 822 0 0 Pass 0.0862 773 0 0 Pass 0.0876 729 0 0 Pass 0.0891 694 0 0 Pass 0.0905 648 0 0 Pass 0.0919 605 0 0 Pass 0.0933 567 0 0 Pass 0.0947 522 0 0 Pass 0.0962 481 0 0 Pass 0.0976 449 0 0 Pass 0.0990 415 0 0 Pass 0.1004 385 0 0 Pass 0.1018 343 0 0 Pass 0.1032 315 0 0 Pass 0.1047 284 0 0 Pass 18943-Pond 11/2/2018 10:22:33 AM Page 13 0.1061 259 0 0 Pass 0.1075 237 0 0 Pass 0.1089 216 0 0 Pass 0.1103 184 0 0 Pass 0.1118 165 0 0 Pass 0.1132 149 0 0 Pass 0.1146 133 0 0 Pass 0.1160 119 0 0 Pass 0.1174 104 0 0 Pass 0.1188 92 0 0 Pass 0.1203 80 0 0 Pass 0.1217 73 0 0 Pass 0.1231 68 0 0 Pass 0.1245 59 0 0 Pass 0.1259 53 0 0 Pass 0.1274 51 0 0 Pass 0.1288 46 0 0 Pass 0.1302 39 0 0 Pass 0.1316 36 0 0 Pass 0.1330 33 0 0 Pass 0.1344 31 0 0 Pass 0.1359 28 0 0 Pass 0.1373 27 0 0 Pass 0.1387 25 0 0 Pass 0.1401 21 0 0 Pass 0.1415 20 0 0 Pass 0.1430 17 0 0 Pass 0.1444 15 0 0 Pass 0.1458 13 0 0 Pass 0.1472 11 0 0 Pass 0.1486 11 0 0 Pass 0.1500 7 0 0 Pass 0.1515 6 0 0 Pass 0.1529 6 0 0 Pass 0.1543 4 0 0 Pass 0.1557 4 0 0 Pass 0.1571 4 0 0 Pass 0.1586 3 0 0 Pass 0.1600 3 0 0 Pass 0.1614 3 0 0 Pass 0.1628 3 0 0 Pass 0.1642 3 0 0 Pass 0.1656 3 0 0 Pass 0.1671 3 0 0 Pass 0.1685 3 0 0 Pass 0.1699 3 0 0 Pass 0.1713 3 0 0 Pass 18943-Pond 11 /2/2018 10:22:33 AM Page 14 Appendix 'redeveloped Schematic ' Basin �{ ,1.80ac 18943-Pond 11 /2/2018 10:23:01 AM Page 18 Mitigated Schematic a Basin 1 rapezoidal Pond 1 18943-Pond 11 /2/2018 10:23:03 AM Page 19 Disclaimer Legal Notice This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright 0 by : Clear Creek Solutions, Inc. 2005-2018; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 18943-Pond 11/2/2018 10:23:04 AM Page 31 DETENTION VAULT SIZING WWHM2012 PROJECT REPORT 18943 Federal Way Tilt Detention Vault and Water Quality Sizing 11 /2/2018 General Model Information Project Name: 18943-Vault Site Name: Panattoni Site Address: 1019 s 351 st st City: Federal Way Report Date: 11 /2/2018 Gage: Seatac Data Start: 1948/10/01 Data End: 2009/09/30 Timestep: 15 Minute Precip Scale: 0.000 (adjusted) Version Date: 2018/03/08 Version: 4.2.14 POC Thresholds Low Flow Threshold for POC1: 50 Percent of the 2 Year High Flow Threshold for POC1: 50 Year 18943-Vault 11/2/2018 9:27:25 AM Page 2 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Forest, Flat 0.75 C, Forest, Mod 0.75 C, Forest, Steep 1.34 Pervious Total 2.84 Impervious Land Use acre Impervious Total 0 Basin Total 2.84 Element Flows To: Surface Interflow Groundwater 18943-Vault 11/2/2018 9:27:25 AM Page 3 Mitigated Land Use Basin 1 Bypass: No GroundWater: No Pervious Land Use acre C, Lawn, Flat 0.88 Pervious Total 0.88 Impervious Land Use acre PARKING FLAT 1.96 Impervious Total 1.96 Basin Total 2.84 Element Flows To: Surface Vault 1 Interflow Vault 1 Groundwater 18943-Vault 11/2/2018 9:27:25 AM Page 4 Mitigated Routing Vault 1 Width: Length: Depth: Discharge Structure Riser Height: Riser Diameter: Orifice 1 Diameter: Orifice 2 Diameter: Orifice 3 Diameter: Element Flows To: Outlet 1 63 ft. 63 ft. 11 ft. 10 ft. 18 in. 0.91 in. Elevation:0 ft. 1.65 in. Elevation:6.77 ft. 0.88 in. Elevation:7.6 ft. Outlet 2 Vault Hydraulic Table Stage(feet) 0.0000 0.1222 0.2444 0.3667 0.4889 0.6111 0.7333 0.8556 0.9778 1.1000 1.2222 1.3444 1.4667 1.5889 1.7111 1.8333 1.9556 2.0778 2.2000 2.3222 2.4444 2.5667 2.6889 2.8111 2.9333 3.0556 3.1778 3.3000 3.4222 3.5444 3.6667 3.7889 3.9111 4.0333 4.1556 4.2778 4.4000 4.5222 Area(ac.) 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 0.091 Volume(ac-ft.) 0.000 0.011 0.022 0.033 0.044 0.055 0.066 0.078 0.089 0.100 0.111 0.122 0.133 0.144 0.155 0.167 0.178 0.189 0.200 0.211 0.222 0.233 0.245 0.256 0.267 0.278 0.289 0.300 0.311 0.323 0.334 0.345 0.356 0.367 0.378 0.389 0.400 0.412 Discharge(cfs) 0.000 0.007 0.011 0.013 0.015 0.017 0.019 0.020 0.022 0.023 0.024 0.026 0.027 0.028 0.029 0.030 0.031 0.032 0.033 0.034 0.035 0.036 0.036 0.037 0.038 0.039 0.040 0.040 0.041 0.042 0.043 0.043 0.044 0.045 0.045 0.046 0.047 0.047 Infilt(cfs) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 18943-Vault 11/2/2018 9:27:25 AM Page 6 4.6444 0.091 0.423 0.048 0.000 4.7667 0.091 0.434 0.049 0.000 4.8889 0.091 0.445 0.049 0.000 5.0111 0.091 0.456 0.050 0.000 5.1333 0.091 0.467 0.050 0.000 5.2556 0.091 0.478 0.051 0.000 5.3778 0.091 0.490 0.052 0.000 5.5000 0.091 0.501 0.052 0.000 5.6222 0.091 0.512 0.053 0.000 5.7444 0.091 0.523 0.053 0.000 5.8667 0.091 0.534 0.054 0.000 5.9889 0.091 0.545 0.055 0.000 6.1111 0.091 0.556 0.055 0.000 6.2333 0.091 0.568 0.056 0.000 6.3556 0.091 0.579 0.056 0.000 6.4778 0.091 0.590 0.057 0.000 6.6000 0.091 0.601 0.057 0.000 6.7222 0.091 0.612 0.058 0.000 6.8444 0.091 0.623 0.078 0.000 6.9667 0.091 0.634 0.092 0.000 7.0889 0.091 0.645 0.101 0.000 7.2111 0.091 0.657 0.109 0.000 7.3333 0.091 0.668 0.116 0.000 7.4556 0.091 0.679 0.122 0.000 7.5778 0.091 0.690 0.128 0.000 7.7000 0.091 0.701 0.140 0.000 7.8222 0.091 0.712 0.148 0.000 7.9444 0.091 0.723 0.155 0.000 8.0667 0.091 0.735 0.162 0.000 8.1889 0.091 0.746 0.168 0.000 8.3111 0.091 0.757 0.174 0.000 8.4333 0.091 0.768 0.179 0.000 8.5556 0.091 0.779 0.185 0.000 8.6778 0.091 0.790 0.190 0.000 8.8000 0.091 0.801 0.194 0.000 8.9222 0.091 0.813 0.199 0.000 9.0444 0.091 0.824 0.204 0.000 9.1667 0.091 0.835 0.208 0.000 9.2889 0.091 0.846 0.213 0.000 9.4111 0.091 0.857 0.217 0.000 9.5333 0.091 0.868 0.221 0.000 9.6556 0.091 0.879 0.225 0.000 9.7778 0.091 0.890 0.229 0.000 9.9000 0.091 0.902 0.233 0.000 10.022 0.091 0.913 0.289 0.000 10.144 0.091 0.924 1.109 0.000 10.267 0.091 0.935 2.368 0.000 10.389 0.091 0.946 3.758 0.000 10.511 0.091 0.957 4.989 0.000 10.633 0.091 0.968 5.847 0.000 10.756 0.091 0.980 6.418 0.000 10.878 0.091 0.991 6.901 0.000 11.000 0.091 1.002 7.351 0.000 11.122 0.091 1.013 7.775 0.000 11.244 0.000 0.000 8.177 0.000 18943-Vault 11/2/2018 9:27:25 AM Page 7 Analysis Results POC 1 �o m U 017 0 LL oil 10E-4 10E-3 10E-2 10E-1 1 10 100 Percent Time Exceeding + Predeveloped Predeveloped Landuse Totals for POC #1 Total Pervious Area: 2.84 Total Impervious Area: 0 Mitigated Landuse Totals for POC #1 Total Pervious Area: 0.88 Total Impervious Area: 1.96 'v Cumulative Probe6il6y 's LL 00 os i z - 10 a: n 67 ao ss vs N sas x Mitigated Flow Frequency Method: Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.103874 5 year 0.166624 10 year 0.206378 25 year 0.253226 50 year 0.285442 100 year 0.315386 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.058757 5 year 0.094963 10 year 0.126627 25 year 0.177167 50 year 0.22371 100 year 0.279026 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.114 0.042 1950 0.131 0.053 1951 0.214 0.183 1952 0.074 0.038 1953 0.058 0.047 1954 0.083 0.049 1955 0.146 0.049 r 1956 0.114 0.056 1957 0.099 0.049 1958 0.102 0.051 18943-Vault 11/2/2018 9:27:25 AM Page 8 1959 0.085 0.043 1960 0.153 0.156 1961 0.083 0.053 1962 0.057 0.037 1963 0.075 0.049 1964 0.098 0.050 1965 0.070 0.057 1966 0.066 0.046 1967 0.153 0.052 1968 0.087 0.047 1969 0.089 0.044 1970 0.076 0.047 1971 0.081 0.051 1972 0.167 0.133 1973 0.079 0.056 1974 0.080 0.051 1975 0.122 0.047 1976 0.084 0.050 1977 0.013 0.041 1978 0.077 0.052 1979 0.043 0.037 1980 0.188 0.158 1981 0.063 0.047 1982 0.144 0.105 1983 0.110 0.050 1984 0.072 0.041 1985 0.041 0.044 1986 0.182 0.057 1987 0.159 0.126 )1988 0.066 0.043 1989 0.040 0.043 1990 0.349 0.156 1991 0.198 0.141 1992 0.084 0.052 1993 0.081 0.041 1994 0.027 0.036 1995 0.106 0.053 1996 0.240 0.182 1997 0.204 0.172 1998 0.058 0.042 1999 0.192 0.124 2000 0.084 0.053 2001 0.017 0.035 2002 0.093 0.062 2003 0.127 0.046 2004 0.171 0.188 2005 0.115 0.050 2006 0.122 0.055 2007 0.262 0.232 2008 0.340 0.189 2009 0.159 0.058 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.3494 0.2316 2 0.3404 0.1888 3 0.2624 0.1882 18943-Vault 11/2/2018 9:28:01 AM Page 9 4 0.2400 0.1830 5 0.2145 0.1824 6 0.2041 0.1717 7 0.1976 0.1582 8 0.1922 0.1562 9 0.1880 0.1560 10 0.1819 0.1407 11 0.1707 0.1334 12 0.1669 0.1263 13 0.1595 0.1237 14 0.1593 0.1046 15 0.1531 0.0619 16 0.1525 0.0575 17 0.1465 0.0566 18 0.1445 0.0565 19 0.1308 0.0561 20 0.1270 0.0558 21 0.1219 0.0553 22 0.1217 0.0535 23 0.1150 0.0534 24 0.1143 0.0529 25 0.1136 0.0527 26 0.1097 0.0524 27 0.1059 0.0519 28 0.1015 0.0515 29 0.0994 0.0513 30 0.0978 0.0511 31 0.0933 0.0508 32 0.0888 0.0500 33 0.0869 0.0499 34 0.0847 0.0497 35 0.0844 0.0497 36 0.0836 0.0490 37 0.0836 0.0489 38 0.0835 0.0487 39 0.0829 0.0486 40 0.0808 0.0472 41 0.0805 0.0471 42 0.0801 0.0470 43 0.0794 0.0470 44 0.0771 0.0468 45 0.0762 0.0463 46 0.0753 0.0460 47 0.0743 0.0440 48 0.0721 0.0438 49 0.0704 0.0433 50 0.0663 0.0426 51 0.0661 0.0425 52 0.0633 0.0424 53 0.0579 0.0421 54 0.0577 0.0414 55 0.0566 0.0411 56 0.0426 0.0409 57 0.0409 0.0377 58 0.0396 0.0373 59 0.0274 0.0367 60 0.0165 0.0359 61 0.0128 0.0354 18943-Vault 11/2/2018 9:28:01 AM Page 10 Duration Flows The Facility PASSED Flow(cfs) Predev Mit Percentage Pass/Fail 0.0519 13543 10354 76 Pass 0.0543 12301 7009 56 Pass 0.0567 11223 4169 37 Pass 0.0590 10269 2667 25 Pass 0.0614 9364 2603 27 Pass 0.0637 8545 2545 29 Pass 0.0661 7835 2494 31 Pass 0.0684 7232 2449 33 Pass 0.0708 6656 2402 36 Pass 0.0732 6145 2329 37 Pass 0.0755 5664 2280 40 Pass 0.0779 5242 2218 42 Pass 0.0802 4825 2162 44 Pass 0.0826 4453 2091 46 Pass 0.0850 4149 2036 49 Pass 0.0873 3874 1959 50 Pass 0.0897 3610 1906 52 Pass 0.0920 3373 1857 55 Pass 0.0944 3153 1799 57 Pass 0.0968 2956 1737 58 Pass 0.0991 2761 1668 60 Pass 0.1015 2594 1596 61 Pass 0.1038 2421 1509 62 Pass 0.1062 2239 1448 64 Pass 0.1085 2055 1387 67 Pass 0.1109 1902 1293 67 Pass 0.1133 1746 1199 68 Pass 0.1156 1621 1123 69 Pass 0.1180 1501 1047 69 Pass 0.1203 1401 983 70 Pass 0.1227 1292 909 70 Pass 0.1251 1196 835 69 Pass 0.1274 1096 766 69 Pass 0.1298 1027 733 71 Pass 0.1321 972 708 72 Pass 0.1345 931 682 73 Pass 0.1368 883 655 74 Pass 0.1392 835 635 76 Pass 0.1416 789 609 77 Pass 0.1439 748 576 77 Pass 0.1463 702 555 79 Pass 0.1486 663 525 79 Pass 0.1510 628 487 77 Pass 0.1534 593 450 75 Pass 0.1557 553 402 72 Pass 0.1581 517 367 70 Pass 0.1604 472 345 73 Pass 0.1628 434 321 73 Pass 0.1652 399 296 74 Pass 0.1675 361 270 74 Pass 0.1699 325 249 76 Pass 0.1722 297 224 75 Pass 0.1746 271 206 76 Pass 18943-Vault 11/2/2018 9:28:01 AM Page 12 0.1769 245 187 76 Pass 0.1793 222 169 76 Pass 0.1817 195 147 75 Pass 0.1840 176 125 71 Pass 0.1864 154 104 67 Pass 0.1887 139 81 58 Pass 0.1911 127 73 57 Pass 0.1935 112 70 62 Pass 0.1958 95 66 69 Pass 0.1982 86 63 73 Pass 0.2005 78 59 75 Pass 0.2029 70 57 81 Pass 0.2052 58 54 93 Pass 0.2076 53 50 94 Pass 0.2100 51 48 94 Pass 0.2123 45 44 97 Pass 0.2147 42 42 100 Pass 0.2170 41 39 95 Pass 0.2194 39 35 89 Pass 0.2218 35 30 85 Pass 0.2241 32 23 71 Pass 0.2265 30 19 63 Pass 0.2288 29 15 51 Pass 0.2312 26 7 26 Pass 0.2336 25 0 0 Pass 0.2359 21 0 0 Pass 0.2383 19 0 0 Pass 0.2406 17 0 0 Pass 0.2430 14 0 0 Pass 0.2453 13 0 0 Pass 0.2477 12 0 0 Pass 0.2501 11 0 0 Pass 0.2524 7 0 0 Pass 0.2548 5 0 0 Pass 0.2571 5 0 0 Pass 0.2595 5 0 0 Pass 0.2619 4 0 0 Pass 0.2642 3 0 0 Pass 0.2666 3 0 0 Pass 0.2689 3 0 0 Pass 0.2713 3 0 0 Pass 0.2736 3 0 0 Pass 0.2760 3 0 0 Pass 0.2784 3 0 0 Pass 0.2807 3 0 0 Pass 0.2831 3 0 0 Pass 0.2854 3 0 0 Pass 18943-Vault 11/2/2018 9:28:01 AM Page 13 Appendix Predeveloped Schematic Basin 1 12.84ac 18943-Vault 11/2/2018 9:28:27 AM Page 17 Mitigated Schematic a asi n .84ac f F.il,'Vault 1 18943-Vault 11/2/2018 9:28:29 AM Page 18 Disclaimer Legal Notice This program and accompanying documentation are provided 'as -is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee ❑r sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business Interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright @ by : Clear Creek Solutions, Inc. 2005-2018; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com 18943-Vault 11/2/2018 9:28:30 AM Page 31 WATER QUALITY UNIT DETAIL SITE SPECIFIC DATA PROJECT NAME Federal Way Tilt PROJECT LOCATION Federal Way STRUCTURE lD TREATMENT REQUIRED VOLUME BASED (CF) FLOW BASED (CFS) 0.06 TREATMENT HGL AVAILABLE (FT) PEAK BYPASS REQUIRED (CFS) - IF APPLICABLE PIPE DATA I E. MATERIAL DIAMETER INLET PIPE 1 228.24 CPEP 12" OUTLET PIPE 227.74 CPEP 12" PRETREATMENT BIOFIL IRA TION DISCHARGE RIM ELEVATION 242.62 SURFACE LOAD PARKWAY OPEN PLANTER PARKWAY FRAME & COVER 0J0" N/A 024" WETLANDMEDIA VOLUME (CY) J.05 WETLANDMEDIA DELIVERY METHOD TBD ORIFICE SIZE (DIA. INCHES) 01.71 " MAXIMUM PICK WEIGHT (LBS) 27000 MO —TES: PRELIMINARY, NOT FOR CONSTRUCTION INSTALLATION NOTES 1. CONTRACTOR TO PROVIDE ALL LABOR, EQUIPMENT, MATERIALS AND INCIDENTALS REQUIRED TO OFFLOAD AND INSTALL THE SYSTEM AND APPURTENANCES IN ACCORDANCE WITH THIS DRAWING AND THE MANUFACTURERS SPECIFICATIONS, UNLESS OTHERWISE STATED IN MANUFACTURERS CONTRACT 2. UNIT MUST BE INSTALLED ON LEVEL BASE. MANUFACTURER RECOMMENDS A MINIMUM 6" LEVEL ROCK BASE UNLESS SPECIFIED BY THE PROJECT ENGINEER. CONTRACTOR IS RESPONSIBLE TO VERIFY PROJECT ENGINEERS RECOMMENDED BASE SPECIFICATIONS J. ALL PIPES MUST BE FLUSH WITH INSIDE SURFACE OF CONCRETE. (PIPES CANNOT INTRUDE BEYOND FLUSH). INVERT OF OUTFLOW PIPE MUST BE FLUSH WITH DISCHARGE CHAMBER FLOOR. ALL GAPS AROUND PIPES SHALL BE SEALED WATER TIGHT WITH A NON -SHRINK GROUT PER MANUFACTURERS STANDARD CONNECTION DETAIL AND SHALL MEET OR EXCEED REGIONAL PIPE CONNECTION STANDARDS. 4. CONTRACTOR TO SUPPLY AND INSTALL ALL EXTERNAL CONNECTING PIPES. 5. CONTRACTOR RESPONSIBLE FOR INSTALLATION OF ALL RISERS, MANHOLES, AND HATCHES CONTRACTOR TO GROUT ALL MANHOLES AND HATCHES TO MATCH FINISHED SURFACE UNLESS SPECIFIED OTHERWISE. 6. DRIP OR SPRAY IRRIGATION REQUIRED ON ALL UNITS WITH VEGETATION. _,ENERAL NOTES PRE-FlLTER PERIMETER 6 CARTRIDGE VOID AREA ca - - LLLLLLLL -- LLLLLLLL ' -- INLET PIPE `LLL`L� SEE NOTES r a.eresxw : UNDEROWN _N C/L MANHOLE MANIFOLD _-- __ --------, DRM/NDOWN - RLTER _ - - ILL LL LLLL I � I OUTLET PIPE — - SEE NOTES — - -- =s DRAIN DOWN LINE- I BED PLAN VIEW VEGETAAON PLANT ESTABLISHMENT MEDIA 14'-0' ELEVATION VIEW 1. MANUFACTURER TO PROVIDE ALL MATERIALS UNLESS OTHERWISE NOTED. THE PRODUCT "RM MAY BE PROPRIETARY AND CONFIDENTIAL: 1 2. ALL DIMENSIONS, ELEVATIONS, SPECIFICATIONS AND CAPACITIES ARE SUBJECT TO PR07ECMD BY ONE OR MoliE OF THE MOWNG US PA1EM£ THE INFOfiWWN CONTAINED IN 7HIS DRAWING IS 7HE SOLE U L A R l M Q_ DA CHANGE. FOR PROJECT SPECIFIC DRAWINGS DETAILING EXACT DIMENSIONS, WEIGHTS 7,425,262,• 7,470,362,• 7,674,378,• PROPERLY OF MODULAR WMMOS SM51W ANY ' t ° M L�-.. AND ACCESSORIES PLEASE CONTACT MANUFACTURER. �,To3sls,• REUTm FORDOREPRODUCLNJN IN PART OR AS A WHOLE wlnlour THE wRmav .j PAnWS OR OTHER PATDNLS PENDING PERM/SS/ON OF MODULAR WERANDS SYSTEMS 6 PROH187ED. --modulcrwetionds.com 11855) SMOD-WE'I 6"^4'-00 a- { 5 -Om LEFT END VIEW L r MANHOLE RIGHT END VIEW FLOW CONTROL RISER TREATMENT FLOW (CFS) 0.144 OPERATING HEAD (FT) J.4 PRETREATMENT LOADING RATE (GPM/SF) TBD WETLAND MEDIA LOADING RATE (GPM/SF) 1.0 MWS-L-4-13-V STORM INA TER B/OFIL TRA TION SYSTEM STANDARD DETAIL 5.0 CONVEYANCE SYSTEM ANALYSIS AN❑ DESIGN 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN The conveyance system sizing utilizes the Modified Rational Method with a 6.3 minute initial time of concentration and Manning's 'n' value of 0.014 for the pipe sizing calculations. 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