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93-102896 s City of Federal Way FINAL STAFF EVALUATION FOR ENVIRONMENTAL CHECKLIST Application No. SEP93-0023 Date: December 23, 1993 Project Name: Chrzanoski Retaining Wall Applicant: Mr. and Mrs. E. Chrzanoski Contact: Mario Morales, phone 646-3473 Location: 610 South 288th Lane, Federal Way S-T-R: SW-32-22-4 Parcel Size: Approximately 17,820 square feet Proposal: Construct one 80 foot long by 11 foot tall soldier pile retaining wall on a 17,820 square foot developed residential lot. Type of Action: Building Permit Existing zoning: RS-15. 0 Comprehensive Plan Designation: Suburban Residential NOTE: Technical reports and attachments referenced below may not be attached to all copies of this staff evaluation. Copies of reports, attachments or other documents may be reviewed and/or obtained by contacting Bill Kingman, Associate Planner, Department of Community Development, 33530 1ST Way South, Federal Way, WA. , 98003, phone: 661-4110. A: BACKGROUND: The proposed action is construction of one 80 foot long by 11 foot tall soldier pile design retaining wall as described in the environmental checklist and building permit documents. This improvement is proposed to stabilize a eroding steep slope. SEPA review is required because the proposed development is within 25 feet of a environmentally sensitive area (slope greater than 40 %) . B: ENVIRONMENTAL ELEMENTS: 1. Earth: The southerly portion of the site, developed with a residence, is approximately 205 feet above sea level. 1 The northerly portion of the lot, north of the house, slopes down 75 feet to the abutting lots at a grade in excess of 53%. The north portion of the site has experienced slope failures due to several factors including, but not limited to, surface water drainage and soil types. Federal Way City Code (FWCC) Section 22-1286 regulate development and land surface modifications within twenty five feet of any slope in excess of 40 percent. Development and land surface modifications may not occur unless no reasonable alternative exists and no increase in landslide, seismic or erosion hazard will occur. Analysis of these conditions must be based on a soils report prepared by a licensed engineer. A subsurface investigation and geotechnical recommendation dated 6/25/93 and amendment dated 12/22/93 were prepared by RZA Agra, Inc. , for the site and proposed development. The report indicates the proposed development is feasible from a geotechnical standpoint provided certain recommendations are followed. Based on these documents no increased landslide, seismic or erosion hazard is expected from the proposed development. Approximately 23 cubic yards of material will be imported as backfill for the wall. The geotechnical report provides specific construction recommendations for the retaining wall. These recommendations will be incorporated into subsequent building and site construction plans and documents as required by City codes. FWCC Section 22-1286(d) provides authority for imposing conditions on approval of building or land surface modification on or within twenty five feet of a regulated slope. The FWCC is adopted as a basis for the exercise of substantive SEPA authority pursuant to FWCC Section 22-122, to approve, condition or deny projects. Based on this authority, the following condition is recommended: a. Recommendations of the subsurface investigation and geotechnical recommendation dated 6/25/93 and amendment dated 12/22/93 prepared by RZA Agra, Inc. , shall be incorporated into the design and construction plans for the project as required by the city. 2 . Air: Construction equipment may produce increased dust and odors. Existing vehicle emission systems will adequately mitigate this impact. No further mitigation is necessary. 3 . Water: The geotechnical report provides specific recommendations for controlling surface water drainage issues on the site. These recommendations will be incorporated into 2 subsequent building and site construction plans and documents as required by city codes. In summary, the geotechnical report recommends all storm water at the top of the slope, uphill and behind the proposed retaining wall, either be routed away from the slope or be collected, tightlined to the bottom of the slope and discharged. The design of the conveyance system should be completed by a civil engineer and accepted by the city prior to commencement of construction. FWCC Section 22-1286 (d) provides authority for imposing conditions on approval of building or land surface modification on or within twenty five feet of a regulated slope. The FWCC is adopted as a basis for the exercise of substantive SEPA authority pursuant to FWCC Section 22-122, to approve, condition or deny projects. Based on this authority, the following condition is recommended: a. The drainage system recommended in the geotechnical report shall be designed by a civil engineer licensed in Washington State and accepted by the city prior to commencement of construction related to the retaining wall. 4. Plants: The slope is vegetated with grasses. The submitted geotechnical report recommends the slope be revegetated once the water is removed from the slope to prevent erosion. 5. Animals: Existing urban encroachment and prior removal of significant vegetation has reduced potential Wildlife habitat on the site. This site is not part of a known migratory route or habitat area for an endangered species. 6. Energy and Natural Resources: Concur with checklist. 7. Environmental Health: Concur with checklist. 8. Land and Shoreline Use: The site is zoned RS-15.0 and the city Comprehensive Plan designation is Suburban Residential. The construction of the retaining wall will be compatible with adopted city regulations through review of relevant permit application. 9. Housing: One dwelling exists on the site. One will remain. 10. Aesthetics: No significant aesthetic impacts are anticipated. 11. Light and Glare: Concur with checklist. 12. Recreation: Concur with checklist. 3 13 . Historic and Cultural Preservation: Concur with checklist. 14. Transportation: No transportation improvements are proposed with the application. If the retaining wall development exceeds 25% of value of all structures, the applicant will be required to construct vehicular access easement improvements along South 288th Lane (a private road) in accordance with FWCC Section 22-1496. These improvements will consist of 28 feet (min) of paving, 5 foot sidewalks, vertical curb/gutter and associated drainage facilities. The applicant may request (in writing to Ronald Garrow, Senior Development Engineer) a modification, waiver or deferment of the aforementioned improvements per FWCC Section 22-1477. The request must address and meet at least one of the four criteria listed in the code section. After the request has been received, it will be routed to City staff for determination of an appropriate response. The submittal of a request does not assure that a modification, waiver or deferment will be granted. No further mitigation is necessary. 15. Public Services: Concur with checklist. 16. Utilities: Concur with checklist. C. CONCLUSION: The proposal can be found to not have a probable significant adverse impact on the environment if appropriate conditions are properly implemented pursuant to a mitigated DNS. Conditions of the MDNS are based on impacts identified within the environmental checklist, attachments, and the above Final Staff Evaluation for Environmental Checklist; and are supported by policies, plans, rules and regulations formally adopted by the City for the exercise of substantive authority under SEPA. The City reserves the right to review any future revisions or alterations to the site or to the proposal in order to determine the environmental significance or non- significance. Prepared by: Bill Kingman, Associate Planner Date: December 23, 1993 SEP9323.ENV 4 t • >) CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT 33530 First Way South Federal Way, WA 98003 (206) 661-4118 MITIGATED DETERMINATION OF NON-SIGNIFICANCE FILE NUMBER: SEP93-0023 Description of Proposal: Construct one 80 foot long by 11 foot tall solider pile design retaining wall on a 17,820 square foot developed residential lot. Applicant: Mr. and Mrs. E. Chrzanoski Contact: Mario Morales, phone 646-3473 Location: 610 South 288th Lane, Federal Way Lead Agency: City of Federal Way City Contact: Bill Kingman, Associate Planner, 661-4110 The Responsible Official of the City of Federal Way hereby makes the following Findings of Fact based upon impacts identified in the environmental checklist, the referenced geotechnical report dated 6/25/93 and amendment dated 12/23/93, submitted plans and the "Final Staff Evaluation for Environmental Checklist, Application No. SEP93-0023," and Conclusions of Law based on the Federal Way Comprehensive Plan and other municipal policies, plans, rules and regulations designated as a basis for exercise of substantive authority under the Washington State Environmental Policy Act Rules pursuant to R.C.W. 43.21C.060. Findings of Fact: 1. The proposed action includes construction of one 80 foot long by 11 foot tall retaining wall on a 17,820 square foot developed lot. 2. The geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93, are hereby incorporated by reference as though set forth in full. 3. The "Final Staff Evaluation for Environmental Checklist No. SEP93-0023" is hereby incorporated by reference as though set forth in full. Conclusions of Law: 1. Prepare maintenance standards to protect stormwater systems,prevent erosion and protect natural vegetation. (Comprehensive Plan Policy #H-30) The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment, and an Environmental Impact Statement (EIS) is not required under R.C.W. 43.21C.032(2)(c), only if the following conditions are met. This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. Conditions: 1. Recommendations of the geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93 shall be incorporated into the design and construction plans for the project as required by the city. 2. The drainage system recommended in the geotechnical report shall be designed by a civil engineer licensed in Washington State and accepted by the city prior to commencement of construction related to the retaining wall. This MDNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 15 days from the date of issuance. Comments must be submitted no later than 5 p.m. 1 t I j q y . Unless modified by the City, this determination will become final following expiration of the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the City within 14 calendar days of the above comment deadline. Responsible Official: Kenneth E. Nyberg Position/Title: Assistant City Manager, Director of Community Development Address: 33530 First Way South Federal Way, WA 98003 Date Issued: I 21 2-( q 3 Signature: enneth E. Nyber is nt anager, Director of Community Development SEP9223.MDS 2 y MASI LAND USE APPLICATION caw jjEIF1L_ DEPARTMENT OF COMMUNITY DEVELOPMENT VS) 33530 1st Way South♦Federal Way,WA 98003 APPLICATION NO. f g 3-60g3 Date November 8, 1993 C 1-a"ie5 lb BLP ct3— 1110 Agent Mario Morales Name of Applicant Mario Morales Owner E. Chrzanoski Address 10860 NE 3r lace, Bellevue, WA 98004 Phone 206-646-3473 Q Signature Owner Name/Address Mr. & Mrs. E. Chrzanoski Phone 206-839-6999 (4j different than applicant)610 S. 288th Lane, Federal Way, Wa 98003 Property Location Kroll 365W; 702W Zone RS-15.0 Legal Description Marine Hills No 17 lot 20 TGWUND IN-TR Code 1205 Project Description Hillside retaining wall 80 linear ft. to support eroding hill. Parcel Number(s) 515-293-0200 Type of Permit Required: SEPA Notice Sign Checklist ' Mailed Board Site Plan Review R R * Land Surface Modification R R * Boundary Line Adjustment Binding Site Plan R R R Short Subdivision * * * Subdivision R R R Shoreline R R IRECEIVED Variance R R Conditional Use R R R Use -Process I R R * N O V 1 0 1993 Use -Process II R R R Use -Process III R R RCITY OF FEDERAL WA 1/ Quasi-Judicial Rezone R R R BUILDING DEPT. Variance R* R R Comp. Plan/Rezone R R Annexation R R Lot Line Elimination *Pre-Application Meeting R = Required * = Optional by City MASTERLA.-RM j R G 33530 First Way South Federal Way WA 98003 çif=rzFn_.N) Phone(206) 661-4000 ENVIRONMENTAL CHECKLIST a y _ Purpose of Checklist: el r, ;- The State Environmental Policy Act (SEPA), Chapter 43.21C RCW, requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An environmental impact statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide information to help you and the agency identify impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be done) and to help the agency decide whether an EIS is required. Instructions for Applicants: This environmental checklist asks you to describe some basic information about our proposal. Governmental agencies use this checklist to determine whether the environmental impacts of your proposal are significant, requiring preparation of an EIS. Answer the questions briefly, with the most precise information known, or give the best description you can. You must answer each question accurately and carefully, to the best of your knowledge. In most cases, you should be able to answer the questions from your own observations or project plans without the need to hire experts. If you really do not know the answer, or if a question does not apply to your proposal, write "do not know" or "does not apply." complete answers to the questions now may avoid unnecessary delays later. Some questions ask about governmental regulations, such as zoning, shoreline, and landmark designations. Answer these questions if you can. If you have problems, the governmental agencies can assist you. The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to determining if there may be significant adverse impact. Use of Checklist for Non-project Proposals: Complete this checklist for non-project proposals, even though questions may be answered "does not apply." In addition, complete the Supplemental Sheet for Non-project Actions (part D). For non-project actions, the references in the checklist to the words "project," "applicant," and "property or site" should be read as "proposal," "proposer," and "affected geographic area," respectively. $ 2 TO BE COMPLETED BY APPLICANT EVALUATION FOR AGENCY USE ONLY A. BACKGROUND 1. Name of proposed project, if applicable: Chrzanoski Retaining Wall 2. Name of applicant: Mario Morales Paul Davis Systems 3. Address and phone number of applicant'and contact person: 10860 NE 3rd Place Bellevue, Wa 98004 206-646-3473 4. Date checklist prepared: November 8, 1993 5. Agency requesting checklist: Community Development 6. Proposed timing or schedule (including phasing, if applicable): ASAP 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. NO 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. RZA Agra Inc. Dated 25 June 1993 3 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. Yes, Reference Deb Barker BLD93-1014 Noyes Retaining Wall 10. List any government approvals or permits that will be needed for your proposal, if known. BLD93-1146 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. Build a soldier pile wall approximate length 80 linear feet, approximate depth 35 feet. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. 610 S. 288th Lane Federal Way, Washington 98003 Legal Description: Marine Hills No. 17 Lot 20 TGWUND IN-TR Code 1205 4 B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one): Flat, rolling, hilly, (jteep slope mountainous, other. b. What is the steepest slope on the site (approximate percent slope)? 100 Vertical 150 Horizontal 66% c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, mulch)? If you know the classification of agricultural soils, specify them and note any prime farmland. See RZA Agra report last page (Boring Report) Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. Yes, this is the purpose of the retaining wall. After the neighbor (Noyes) had a retaining wall and drainage system put in the hill side began to slide. e. Describe the purposes type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Approximately 23 yards of sandy/gravel fill which will be trucked to the site. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Erosion is already occurring, this the reason for this project. 5 g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Approximately 40% h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any. Again, the sole purpose for the wall is to control the erosion of the hillside. 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. NONE b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. NONE c. Proposed measures to reduce or control emissions or other impacts to air, if any. NONE 6 3. WATER a. Surface. 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. N/A 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. NO 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. NO 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. NO 5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. NO 7 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. NO b. Ground. 1) Will ground water be withdrawn, or will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. Drain lines are already in existance. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. N/A c. Water Runoff (including storm water). 1) Describe the source of runoff(including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. The house has_had a working drainage system since the original construction. These lines remove water from the gutter systems and transverse the backyard dumpin out to a line that flows into the sewer system. 8 2) Could waste materials enter ground or surface waters? If so, generally describe. NO d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any. 4. PLANTS a. Check or circle types of vegetation found on the site. ❑ deciduous tree: alder, maple, aspen, other O evergreen tree: fir, cedar, pine, other ® shrubs ® grass ❑ pasture 0 crop or grain O wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other ❑ water plant: water lily, eelgrass, milfoil, other [3d other types of vegetation slack berries, Natural b. What kind and amount of vegetation will be removed or altered? NONE c. List threatened or endangered species known to be on or near the site. NONE 9 d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any. Possible use of jute netting and hydraseed 5. ANIMALS a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site. birds:f , eron, eagle, 4gbird ) other: mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other: b. List any threatened or endangered species known to be on or near the site. N/A c. Is the site part of a migration route? If so, explain. Yes, because it overlooked Puget Sound. d. Proposed measures to preserve or enhance wildlife, if any. NONE 10 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. N/A b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. N/A c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any. N/A 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. NONE 1) Describe special emergency services that might be required. N/A 11 2) Proposed measures to reduce or control environmental health hazards, if any. N/A b. Noise. 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment operation, other)? NONE 2) What types and levels of noise would be created by or associated with the project on a short-term or long-term basis (for example: traffic, construction operation, other)? Indicate what hours noise would come from the site. Work should not create more than moderate levels of noise. Work will be restricted to daytime hours. 3) Proposed measures to reduce or control noise impacts, if any. Work Will be restricted to daytime hours. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? Single family residences on site and adjacent property. • 12 b. Has the site been used for agriculture? If so, describe. NO c. Describe any structures on the site. Split level single family residence. d. Will any structures be demolished? If so, what? NO e. What is the current zoning classification of the site? RS 15.0 f. What is the current comprehensive plan designation of the site? Suburban residencial g. If applicable, what is the current shoreline master program designation of the site? N/A 13 h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. Yes, Slope in excess of 40% i. Approximately how many people would reside or work in the completed project? 2 people • j. Approximately how many people would the completed project displace? NONE k. Proposed measures to avoid or reduce displacement impacts, if any. N/A 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. Complies with all codes 9. HOUSING - a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. N/A 14 b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. N/A c. Proposed measures to reduce or control housing impacts, if any. N/A 10. AESTHETICS a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The wall should not exceed the level of the hill by more than a couple of feet. Materials will consist of steel and wood. b. What views in the immediate vicinity would be altered or obstructed? NONE c. Proposed measures to reduce or control aesthetic impacts, if any. NONE 15 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce? What time of day would it mainly occur? NONE b. Could light or glare from the finished project be a safety hazard or interfere with views? NONE c. What existing off-site sources of light or glare may affect your proposal? NONE d. Proposed measures to reduce or control light and glare impacts, if any. NONE 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? Sacaj awea Park 16 b. Would the proposed displace any existing recreational uses? If so, describe. NONE c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any. NONE 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on, or proposed for, nation, state, or local • preservation registers known to be on or next to the site? If so, generally describe. N/A b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. N/A c. Proposed measures to reduce or control impacts, if any. N/A 17 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. Access is soley off Dash Point Rd. b. Is the site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? NO c. How many parking spaces would the completed project have? How many would the project eliminate? 0 (Zero) d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). NONE e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. NONE 18 f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. NONE ADDED g. Proposed measures to reduce or control transportation impacts, if any. NONE 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally describe. NO b. Proposed measures to reduce or control direct impacts on public services, if any. NONE 19 16. UTILITIES a. Circle utilities currently available at the site: (lectricity� natural gas, ater, refuse -lephone nitary sewe)septic system, other (please list). b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. NONE C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: Mario Morales Date Submitted: November 10, 1993 . o° .--A,.^... . .,:•.-- --- ---- iiiipp -4.e -.. . i/ 44 .41e t .1 1'7% ..' I 44 to *Ilkintag,/..io .* \.41/ Ak P TO ' ��N�•so• •.'�, .y ye 4/ �.�a �• .i fe'. • w of /0. %• 4J ` 'it 41J4 ca 1/N J s. G i r r C � • mp oo O� •� cocto ;N 4y '° tr4 • /o • .'t .1 0 may; ` c. 1' i Q N. '• • h Si. p 4 • a 9ti / .y .n �:� !. !/ 'r w �' S dt ` �'�; /v 04. Orr y ,IO 1 �� r' . _,,,, • • l (`(• v, M i r ito • iz . •••• - `fir,.• i t /' �• +8 �° �/o .�J 1 9 i - R - .gr • off %\<., -‘_ 4 % gi II 1 A 't .., 4‘.4. ;IV %.%11 .91 540%:. ici(..ill i ‘,. *-:. N .:ram 1 `-C% /,' 0 . •�� oh t • #... • ...1.- '.4:61:i ...1/4 9% C N Tili ..-. •:k• J S - ` �.e � . • y ° J, •• •�• Vr, a bf ,•b • . 1f"N • .h �•�'. } t. .p" .t• #A, ��+['o '' .:� �'. �p 0 tee' ��► o c :.$•r '°*1 t r;l / ' •S �,.4 ./ 9 •lb o -4 w o c W O r '', a� del ! e v„- / r t.IV. 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Bo0 74.w.. 1'V...".„ 4: 1w g % N c ` a yy ! ; Y `' /y'10 9 a Z Zp, R Y , 0 II i M K'P rem' of o , L° ✓✓r►stl< ly !! Z 'o'. u� ''a 9� 1� kV* o .ro°.o/ sc� c,v t , �� '1J� ! �Y aro W NN w o- p 1w :2t.l. =ol• ' ,M.`• ° aes o Nu ° W oI "rl L� 1�'` 00.OP'F "Y.� td o�t. ,o'e.•♦ `T r 1.M '(. '1 • • AI,S 0• •z , ter '` '.e ini ,�. •�': 'ti `ap Ise«GYC .C� .�ie •1 •il-tr _ o '11 --i: °?..6 r�� ' � 3r n'' o y� , ., / . . 1 I , A I e--- 4 Z7----? ----------1 <- ---- C7 1 i cL. et i (.1\ i—o __ ----- /I 1 .3 I 1,4 I (--. 4s-t --9 t 1 1 1 i . „....., ....„, 'i--- k' \ V k N*sk JUN-10—'era 20:51 ID: TEL. NO: 14390 P02 _____ M 11335 NE 122nd Way RZA AGRA, Inc. Suite 100 Engineering& Environmental Services Kirkland,WA 88034.6516 (206)820-4669 FAX 1206)821 3914 22 December 1993 11-08969-00 Paul Davis Systems 10800 N.E. Third Place Bellevue, Washington 98004 Attention: Mr. Mario Moralis Subject; Seismic Concerns Chrzanoski Residence 610 S. 288th Lane Federal Way,Washington Gentlemen: This letter concerns the seismic hazard of the proposed new retaining wail at the Chrzanoski residence requested by Mr. Mario Moralis as, In turn, requested by Mr. Bill Kingman of the Cky of Federal Way. We previously performed a subsurface Investigation for retaining wail recommendations in our report dated 25 Jura 1993 for Job No, 11.08989.00. In Its current configuration, the slope Is In a marginally stable condition, Based on our studies, It Is likely that a moderately strong earthquake would result In some displacement of the existing slope. Construction of the new wail will Increase the safety factor against !Aside movement during an earthquake event. Conventionahy, designed retaining walls possess an adequate safety factor to resist transient loading Imposed by substantially large earthquakes. Therefore,the new wail will reduce the risk of damage in the event of a seismic occurrence. We trust this letter is sufficient for your current needs. if there are any questions, or if you require further information, please do not hesi< }I. FLEA, Respectfully submitted, 4� R?A AGRA, Inc. 164'7 41:4314‘ Larry A, B fie, P.E. ti Project Engineerf:.q '� PIRE$ 8/• "1r4 .« s DRAB ames S. Dranip P.E. 40°euAssociate , rho IABJJSOfah 0 4, ��;±at,'' 4,, • s�014ALSr. AGRA •',�.•`- Earth&Enveronmanial R,roop FIRES 12/19/' JUN-10-'00 20:50 ID; TEL N0: U330 Poi A Facsimile Transmission Cover RZA AGRA, Inc 0 • 11335 NE 122nd Way Suite 100 Kirkland, WA 98034-6918 (206) 820-4669 Fax: (206) 821-3914 Date:AEG_�a r'4i Time: Please deliver the following material as soon as possible: Attention: I3 r I) K 7,4161 Fax 8: I- acq 46 1- 41a, Company: G,'ry a 4 b7-cvld na./ From; L a r r y r3sy4, Includes cover plus pages Subject: IP'g'' .',P !6 e t›-i eA cc, Please natty RZA AGRA,Inc.Immediately tt not received properly. Call sender _. at(206)820-4669 Remarks: . . 4 AFFIDAVIT OF PUBLICATION • NOTICE OF ENVIRONV tNTAL No. 119 MITIGATED DETiEF.JINATION OF NONSIGNIMCANCE Federal Way,Washington STATE OF WASHINGTON) Application No:SEP93.0023 COUNTY OF KING )ss. The City of Federal Way has deter- mined that the following project does not have a probable significant I,Carla Royter,being first duly sworn on oath deposes and says: adverse impact on the environment, That she is the Marketing Director of The Federal Way News,a and an Environmental Impact State- tri-weekly newspaper which is now and at all times herein ment (Elm is not;required under mentioned has been published and printed in an office maintained RCW-4'S.'21'C:030(2)tbri'h15 dadtaibir at the place of publication at Federal Way, King County, was made after review of a' corn- Washington,that by order of the Superior Court of the State of pleted enyironmental checklist and Washington in and for King County,said newspaper is now and other information on.file with the at all times mentioned herein has been approved as a legal City newspaper for the publication of any advertisement, notice, PROPOSED ACTION: Construct one summons,report,proceedings,or other official document required 80 foot long by 11 foot tall solider by law to be published, that said newspaper was published pile design retaining wall on a regularly at least once each week,in the English language,as a 17,820 ;square foot developed newspaper of general circulation in Federal Way, King County, residential lot.. Washington, at the time of application to the aforementioned PROPONENT: Mr. and Mrs. E. Superior Court for approval as a legal newspaper, and was so Chrzanoski published for at least six months prior to the date of said AGENT: Mario Morales, Paul bavis publication,and is now and at all times mentioned herein has been Systems,phone 646 3473 LOCATION: 610 South 288th Lane, so published. Federal Way That the annexed is a true copy of a Notice by the City of Federal Way of Environmental Mitigated Determination of CITY CONTACT: Bill Kingman, As- Nonsignificance regarding proposed construction of soldier pile socials Planner,phone 661-4110. • design retaining wall on a developed residential lot, File No. MITIGATION MEASURES SEP93-0023 (Summary): Recommendations of the geotechnical report prepared by RZA Agra, dated 6/25/93 and amend- mentas it was published in regular issues of said newspapers once each dated system, s including the drainage. shall be incor- week fora porated into the design and con- period of one consecutive week(s),commencing structions plans as required by the city. on the 30th day of December , 1993, and ending Further information regarding this action is available to the public upon on the 30th day of December , 1993,both dates request at_the Federal Way Depart- ment of Community Development, inclusive,and that said newspaper was regularly distributed to its Federal Way City Hall, 33530 First subscribers and as a newspaper of general circulation during all of Way South, Federal `'Way, WA, 98003, Contact: Bill Kingman, As- said period. sociate Planner, Phone: (206) 661- 4108. This MDNS is issued under That the full amount of the fee charged for the WAC 197-11-340(2). Comments foregoing p5,/ on is/is the suum/�of$ 49.56 must be submitted by 5:00 p.m. on A.�i/ �t-[' F ,..... 1U1l es. Unless modified by the City, this determination will become final fol- Subscribed and sworn to before me this 6th day lowing the comment deadline. Any of January , 1994. o person aggrieved by the City's determination may file an appeal with the City within 14 days of the No blic in and q the S (e of Washington above comment deadline. Residing at Seattle.My c miss n I expires 5/30/95. Published in the Federal Way News on December 30,1993. 119 RECEIVED JA N 0 7 1994 -r wr EEC WAY 1111JJi V11 Ur U131t JiU11V1V hereby declare, under penalty of perjury of the laws of the State of Washington, that: ❑ Notice of Public Hearing ❑ Determination of Non-Significance ❑ Notice of Public Meeting Mitigated Determination of Non- ignificance ❑ Board of Adjustment Agenda ❑ Determination of Non-Significance Packet and Scoping Notice ❑ PIanning Commission Agenda ❑ Notice of Action Packet. ❑ Short Subdivision Agenda ❑ Official Notice Packet ❑ Notice of Application for . ❑ Other Shoreline Management Permit ❑ Shoreline Management Permit ❑ Other was mailed/fax posted ?/at each of the following addresses (see attached list) on '-"/ I c/ 3 , 1993. Name of Project 17/ KZ ANt / '` "Signature File Number 5 '` 3`� 2 Date )Z 6/ I -T; AFFmA\7.F➢J.i REVISED 1/10192 The .City of Fe 1 Way posted the attache _ roposal to the following locations: The Federal Way Regional Library 34200 1st Way South Federal Way, 98003 Federal Way Library. 848 South 320th Street Federal Way, WA 98003 Federal Way City Hall (Bulliten Board) 33530 1st Way South Federal Way, WA 98003 / `'' -� .`,-U '-1 2 5 �'v �'- • CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT 33530 First Way South Federal Way, WA 98003 (206) 661-4118 MITIGATED DETERMINATION OF NON-SIGNIFICANCE FILE NUMBER: SEP93-0023 Description of Proposal: Construct one 80 foot long by 11 foot tall solider pile design retaining wall on a 17,820 square foot developed residential lot. Applicant: Mr. and Mrs. E. Chrzanoski Contact: Mario Morales, phone 646-3473 Location: 610 South 288th Lane, Federal Way Lead Agency: City of Federal Way City Contact: Bill Kingman, Associate Planner, 661-4110 The Responsible Official of the City of Federal Way hereby makes the following Findings of Fact based upon impacts identified in the environmental checklist, the referenced geotechnical report dated 6/25/93 and amendment dated 12/23/93, submitted plans and the "Final Staff Evaluation for Environmental Checklist, Application No. SEP93-0023," and Conclusions of Law based on the Federal Way Comprehensive Plan and other municipal policies, plans, rules and regulations designated as a basis for exercise of substantive authority under the Washington State Environmental Policy Act Rules pursuant to R.C.W. 43.21C.060. Fmdings of Fact: 1. The proposed action includes construction of one 80 foot long by 11 foot tall retaining wall on a 17,820 square foot developed lot. 2. The geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93, are hereby incorporated by reference as though set forth in full. 3. The "Final Staff Evaluation for Environmental Checklist No. SEP93-0023" is hereby incorporated by reference as though set forth in full. Conclusions of Law: 1. Prepare maintenance standards to protect stormwater systems, prevent erosion and protect natural vegetation. (Comprehensive Plan Policy #H-30) The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment, and an Environmental Impact Statement (EIS) is not required under R.C.W. 43.21C.032(2)(c), only if the following conditions are met. This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. Conditions: 1. Recommendations of the geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93 shall be incorporated into the design and construction plans for the project as required by the city. 2. The drainage system recommended in the geotechnical report shall be designed by a civil engineer licensed in Washington State and accepted by the city prior to commencement of construction related to the retaining wall. • This MDNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 15 days from the date of issuance. Comments must be submitted no later than 5 p.m. t/t I f q 1 .. Unless modified by the City, this determination will become final following expiration of the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the City within 14 calendar days of the above comment deadline. Responsible Official: Kenneth E. Nyberg Position/Title: Assistant City Manager, Director of Community Development Address: 33530 First Way South Federal Way, WA 98003 Date Issued: ( z/1-1( q3 • Signature: �!«� — -- enneth E. Nyber. ' anager, Director of Community Development SEP9223.MDS 2 i r AFFIDAVIT OF DISTRIBUTION I, 2/ 42)x' hereby declare, under penalty of perjury of the laws of the State of Washington, that: ❑ Notice of Public Hearing ❑ Determination of Non-Significance ❑ Notice of Public Meeting Ci Mitigated Determination of Non- Significance ❑ Board of Adjustment Agenda ❑ Determination of Non-Significance Packet and Scoping Notice ❑ Planning Commission Agenda ❑ Notice of Action Packet ❑ Short Subdivision Agenda ❑ Official Notice Packet ❑ Notice of Application for ❑ Notice of Application Shoreline Management Permit ❑ Shoreline Management Permit ❑ Other was mailed/faxed/posted to/at each of the following addresses (see attached list) on 7 , 1993. Name of Project Sigi ature File Number 5/2/'-95 3 Date /. f/i...j AFFIDAVI.FRM REVISED 7/2/93 SEP93-0023 - MAILING LIST Mario Morales Cozen & O'Connor Mantz Sarah Paul Davis Systems Wash Mutual Tower#5200 28701 - 6th P1 So #101 10860 NE 3rd P1 1201 - 3rd Ave Feeral Way WA 98003 Bellevue WA 98004 Seattle WA 98101-3033 Wilson Dale & Judy McGaughey John Roning Robert & Mildred 28701 - 6th P1 So #103 28701 - 6th P1 So #105 28701 - 6th P1 So #107 Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Dorman Linda Wolfe Kathleen Ann Gonzalez Dianne 28701 - 6th P1 So #109 28701 - 6th P1 So #201 28701 - 6th P1 So #203 Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Gilbert Bryan Roney Robert & Pamela Chapman Randall 28701 - 6th P1 So #205 28701 - 6th P1 So #207 28701 - 6th P1 So #209 Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Burgess Karen Sailer Nancy Lewis Charles & Betty 28701 - 6th P1 So #102 28701 - 6th P1 So #104 28701 - 6th P1 So #106 Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Post Linda Atkin Sharon Mays Sandra 28701 - 6th P1 So #108 28701 - 6th P1 So #110 28701 - 6th P1 So #202 Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Jordan James & Kathy Peterson Kenneth & Clara Sampson William & Jean 28701 - 6th P1 So #204 28701 - 6th P1 So #206 28701 - 6th P1 So #208 Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Elliott William Berlin M E Kois John & Karen 28701 - 6th P1 So #210 700 So Marine Hills Wy 532 So Marine Hills Wy Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Olch Lee & Marsha Robinson Mark Lin Charles & Pamela 606 So Marine Hills Wy PO Box 5789 708 So 288th Ln Federal Way WA 98003 Kent WA 98064 Federal Way WA 98003 Welch Garry & Donna Virji Alnoor Noyes Charles & Mary 716 So Marine Hills Wy 602 So 288th Ln 704 So 288th Ln Federal Way WA 98003 Federal Way WA 98003 Federal Way WA 98003 Agodoa Lawrence Park Jong Nicholson Dale 13217 Glenhill Rd 159 So 293rd St 11926 - 53rd St Ct E Silver Spring MD 20904 Federal Way WA 98003 Sumner WA 98390 Deen Samir & Arlene Thompson Michael Conachan Jack & Gladys 3041 - 52nd Ave SW Hardesty Suzanne 522 So 288th Ln Seattle WA 98116 28736 Beach Dr So Federal Way WA 98003 Redondo WA 98054 Hwang Andrew & Hesook Joint Venture Assoc Nelson Gordon 504 So Marine Hills Wy PO Box 3149 28620 - 6th P1 So Federal Way WA 98003 Federal Way WA 98063 Redondo WA 98054 Deen Samir & Arlene 3041 - 52nd Ave SW Seattle WA 98116 CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT 33530 First Way South Federal Way, WA 98003 (206) 661-4118 MITIGATED DETERMINATION OF NON-SIGNIFICANCE FILE NUMBER: SEP93-0023 Description of Proposal: Construct one 80 foot long by 11 foot tall solider pile design retaining wall on a 17,820 square foot developed residential lot. Applicant: Mr. and Mrs. E. Chrzanoski Contact: Mario Morales, phone 646-3473 Location: 610 South 288th Lane, Federal Way Lead Agency: City of Federal Way City Contact: Bill Kingman, Associate Planner, 661-4110 The Responsible Official of the City of Federal Way hereby makes the following Findings of Fact based upon impacts identified in the environmental checklist, the referenced geotechnical report dated 6/25/93 and amendment dated 12/23/93, submitted plans and the "Final Staff Evaluation for Environmental Checklist, Application No. SEP93-0023," and Conclusions of Law based on the Federal Way Comprehensive Plan and other municipal policies, plans, rules and regulations designated as a basis for exercise of substantive authority under the Washington State Environmental Policy Act Rules pursuant to R.C.W. 43.21C.060. Findings of Fact: 1. The proposed action includes construction of one 80 foot long by 11 foot tall retaining wall on a 17,820 square foot developed lot. 2. The geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93, are hereby incorporated by reference as though set forth in full. 3. The "Final Staff Evaluation for Environmental Checklist No. SEP93-0023" is hereby incorporated by reference as though set forth in full. Conclusions of Law: 1. Prepare maintenance standards to protect stormwater systems, prevent erosion and protect natural vegetation. (Comprehensive Plan Policy #H-30) The lead agency for this proposal has determined that the proposed action does not have probable significant adverse impact on the environment, and an Environmental Impact Statement (EIS) is not required under R.C.W. 43.21C.032(2)(c), only if the following conditions are met. This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. Conditions: 1. Recommendations of the geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93 shall be incorporated into the design and construction plans for the project as required by the city. 2. The drainage system recommended in the geotechnical report shall be designed by a civil engineer licensed in Washington State and accepted by the city prior to commencement of construction related to the retaining wall. This MDNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 15 days from the date of issuance. Comments must be submitted no later than 5 p.m. t/t i ! q 9 . Unless modified by the City, this determination will become final following expiration of the above comment deadline. Any person aggrieved of the City's final determination may file an appeal with the City within 14 calendar days of the above comment deadline. Responsible Official: Kenneth E. Nyberg Position/Title: Assistant City Manager, Director of Community Development Address: 33530 First Way South Federal Way, WA 98003 Date Issued: ( 2 f 2.7( q 3 Signature: Kenneth E. Nyber i t anager, Director of Community Development SEP9223.MDS 2 .. 4.1114„ CITY Or `` �/ * 31 3363O 1 AT WAY SOUTH . F<OE R^I.W . WA9NINOTON c seoaCoastncil Members Mayor Mary faintest hart S. Stead Rod Ointz Joel Marks City r Mahlon "Skip" Priest I. Strata ant McFall i Lynn Samplatoa Ray Somllasoa FAX TRANSMITTAL 1VIEMO17LAN'DLTM TG DATE.: (Z /�7 I 1 /J a.JS FAx iv: l— 7"7 r ' 1WMEMFt. OI- X E.S (Including Menlo Shect) • / / /rr PROM: � /e(_. 'it/C4/ri /R"A) ( 67 1 -1 5`9 OFFICE. OF: � f'iNN L4J 12'44 s H4.4t4,sa+try.,y /`7 93�' y�t� ,,, .-r C- •7" 1 -4i3Ltc /.? lo✓ - . TF-+ qt_S -sl ZZ� . tI If there are any problems during this transmission. pisaaa ra11 661-4000 and :.xlc for TRANSMISSION REPORT THIS DOCUMENT (REDUCED SAMPLE ABOVE) WAS SENT ** COUNT # 2 *** SEND *** NO REMOTE STATION I. D. START TIME DURATION #PAGES COMMENT 1I 2062412776 12-27-93 8: 15AM 1 '36" 2 TOTAL 0:01 ' 36" 2 XEROX TELECOPIER 7020 NOTICE OF ENVIRONMENTAL MITIGATED DETERMINATION OF NON-SIGNIFICANCE Federal Way, Washington Application No: SEP93-0023 The City of Federal Way has determined that the following project does not have a probable significant adverse impact on the environment, and an Environment Impact Statement (EIS) is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the City. Proposed Action: Construct one 80 foot long by 11 foot tall solider pile design retaining wall on a 17,820 square foot developed residential lot. Proponent: Mr. and Mrs. E. Chrzanoski Agent: Mario Morales, Paul Davis Systems, phone 646-3473 Location: 610 South 288th Lane, Federal Way City Contact: Bill Kingman, Associate Planner, phone 661-4110 Mitigation Measures (Summary): Recommendations of the geotechnical report prepared by RZA Agra, dated 6/25/93 and amendment dated 12/23/93, including the drainage system, shall be incorporated into the design and construction plans as required by the city. Further information regarding this action is available to the public upon request at the Federal Way Department of Community Development, Federal Way City Hall, 33530 First Way South, Federal Way, WA, 98003, Contact: Bill Kingman, Associate Planner, Phone: (206) 661-4108. This MDNS is issued under WAC 197-11-340(2). Comments must be submitted by 5:00 p.m. on 1/11/94. Unless modified by the City, this determination will become final following the comment deadline. Any person aggrieved by the City's determination may file an appeal with the City within 14 days of the above comment deadline. Published in the Federal Way News on 12/30/93. SEP9323.NOT { LAW OFFICES COZEN AND O'CONNOR A PROFESSIONAL CORPORATION PHILADELPHIA,PA SUITE 5200 DALLAS,TX WASHINGTON MUTUAL TOWER CHARLOTTE,NC 1201 THIRD AVENUE NEW YORK, NY SEATTLE,WA 98101 COLUMBIA,SC SAN DIEGO,CA (206)340-1000 (800)423-1950 WESTMONT,NJ FACSIMILE (206)621-8783 SHAUNA J. MARTIN DIRECT LINE: (206) 224-1251 December 2, 1993 Mr. William Kingman City of Federal Way 33530 1st Way South Federal Way, WA 98003 Re: Chrzanoski Building Permit No. BLD 93-1146 SEPA Review Process Our File No. 42803 Dear Mr. Kingman: Enclosed please find the addressed, stamped envelopes for the Chrzanoskis' neighbors that are required as part of the SEPA review process. We understand that these enve- lopes are the final requirements of the application and SEPA checklist. Please let us know if additional materials are necessary as soon as possible. Thank you for your helpfulness and please do not hesitate to let me know if you have any questions or concerns. Sincerely yours, COZEN AND O'CONNOR $hau a J. Ma SJM/ksm Enclosures *************************************** c***************************************** * !BATCH NUMBER: PT COMMEN * CUSTOMER NAME CHR . .AOSKI * * ***************************************+ s***************************************>( 515292-0020-00 515292-0030-08 BERLIN M E R0578 OLCH LEE F+MARSHA D 069999 700 S MARINE HILLS WAY 606 S MARINE HILLS WAY FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 515292-0040-06 515292-0060-01 KOIS JOHN C C KAREN L 000576 ROBISON MARK W 329999 1 532 S MARINE HILLS WAY PO BOX 5789 FEDERAL WAY WA 98003 KENT WA 98064 T 515293-0160-09 515293-0180-05 WELCH GARRY L+DONNA G 329999 LIN CHARLES+PAMELA LEE 709999 1 716 5 MARINE HILLS WAY 70$ SOUTH 288TH LANE FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 ) 515293-0190-03 515293-0210-09 NOYES CHARLES W+MARY LISA 709999 VIRJI ALNOOR 289999 704 SOUTH 288TH LANE 602 S 288TH LN FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 • 1/ 515293-0220-07 515293-0230-05 CONACHAN JACK 6 GLADYS R0877 AG0D0A LAWRENCE OR 3N5148 11 522 S 288TH LANE 13217 GLENHILL RD FEDERAL WAY WA 98003 SILVER SPRING MD 20904 515293-0240-03 515293-0250-00 HWANG ANDREW S+HESOOK 329999 PARK JONG S 352200 41 504 S MARINE HILLS WY 159 S 293RD ST FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 41 720360-0155-00 720360-0440-05 JOINT VENTURE ASSOC 189999 NICHOLSON DALE 651345 41 PO BOX 3149 11926 53RD ST CT E FEDERAL WAY WA 98063 SUMNER WA 98390 41 720360-0540-04 720360-0545-09 NELSON GORDON D R0378 DEEN SAMIR E ARLENE 7N0334 40 28620 6TH PL S 3041 52ND AVE SW REDONDO WA 98054 SEATTLE WA 98116 40 720360-0550-01 720360-0560-09 DEEN SAMIR F 6 ARLENE 7N0334 THOMPSON MICHAEL 130715 41 3041 52N0 AVE SW HARDESTY. SUZANNE SEATTLE WA 98116 28736 BEACH DR S REDONDO WA 98054 ) IC0545-0010-03 720545-0020-01 MANTZ SARAH L 199999 BURGESS KAREN M 099999 $8TO1 6TH PL SO. 0101 28701 6 'L. S :102 FEDERAL WAY WA 98023 FEDERAL f WA 98003 720545-0030-09 720545-0040-07 WILSON DALE E E JUDY L 900194 SAILER NANCY L 999999 28701 6TH PL S 0103 28701 6TH PL S :104 FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 720545-0050-04 720545-0060-02 MCGAUGHEY JOHN 300382 LEWIS CHARLES E+BETTY J 119999 28701 6TH PL S :105 28701 6TH PL S t106 FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 720545-0070-00 720545-0080-08 RONING ROBERT C+MILDRED M 909999 POST LINDA SUSAN 9N9999 28701 6TH PL S 0107 28701 6TH PL S 0108 FEDERAL WAY_ WA 98003 FEDERAL WAY WA 98003 720545-0090-06 720545-0100-04 DORMAN LINDA D Q49999 ATKIN SHARON L 149999 28701 6TH PL SO 0109 28701 6TH PL S ;110 FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 720545-0110-02 720545-0120-00 WOLFE KATHLEEN ANN 319999 MAYS SANDRA A 999999 28701 6TH PL S 0201 28701 6TH PL S 0202 REDONDO WA 98003 FEDERAL WAY WA 98003 720545-0130-08 720545-0140-06 GONZALEZ DIANNE L 099999 JORDAN JAMES R+KATHY S 149999 28701 6TH PL: S 0203 28701 6TH Pt S 0204 FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 720545-0150-03 720545-0160-01 GILBERT BRYAN W 999999 PETERSON KENNETH A+CLARA 8E999999 28701 6TH PL S 0205 . 28701 6TH PL S 0206 FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 720545-0170-09 720545-0180-07 RONEY ROBERT J+PAMELA M 989999 SAMPSON WILLIAM E+JEAN W 999999 28701- 6TH PL S 0207 28701 6TH PL S C208 FEDERAL WAY WA 98003 FEDERAL WAY. WA 98003 720545-0190-05 720545-0200-03 CHAPMAN J RANOALL 989999 ELLIOTT WILLIAM L 299999 28701 6TH PL S 0209 28701 6TH PL S 0210 FEDERAL WAY WA 98003 FEDERAL WAY WA 98003 1 Public Works Office Memorandum, City of Federal Way TO: Bill Kingman FROM: Skip Tullock DATE: December 6, 1993 SUBJECT: BLD93-1146 & SEP93-0023 , Chrzanoski Retaining Wall (Kroll 365W & 702W, SW 32-22-04, 610 South 288th Lane) The site plan, SEPA checklist and other associated documents for the subject project have been reviewed and the following comments are provided: 1. If the proposed facilities exceed the 25% improvement valuation threshold, the applicant will be required to construct vehicular access easement improvements along South 288th Lane (a private road) in accordance with section 22-1496 of the Federal Way City Code (FWCC) . These improvements will consist of 28 feet (min) of paving, 5 foot sidewalks, vertical curb/gutter and associated drainage facilities. The applicant may request (in writing to Ronald Garrow, Senior Development Engineer) a modification, waiver or deferment of the aforementioned improvements per section 22-1477 of the FWCC. The request must address and meet at least one of the four criteria listed in the code section. After the request has been received, it will be routed to City staff for determination of an appropriate response. The submittal of a request does not assure that a modification, waiver or deferment will be granted. 2 . Since the applicant is proposing to construct facilities within 25 feet of a geologically hazardous area (steep slopes) , compliance with section 22-1286 of the FWCC will be required. The geotech report provided by the applicant appears to address most of the items listed in the aforementioned code section. However, the report needs to include information related to seismic stability of the proposed wall as well as its' affect on adjacent properties as required in the code. 3 . Plans for all of the proposed improvements shall be drawn on sheets no larger than 24"x36" in size to a scale of 1"=20 ' (or larger) and need to be signed by a Professional Engineer licensed in the State of Washington. 4 . The following items in the Environmental Checklist also need to be addressed: a. Item B. l.e (page 4) - Based on our estimate of the amount of fill material that will need to be brought into the site, it appears that the 23 CY figure is low. b. Item B.2 .a (page 5) - Emissions from construction equipment that will be operating on the site during construction of the wall (along with other related improvements) will need to considered. c. Item B. 3 .c. 1 (page 7) - The location of the existing storm drainage system for the house and other impervious surfaces needs to be verified to determine what impacts, if any, the runoff from the existing system will have on the proposed retaining wall (the geotech report does not indicate where the drainage lines are located) . d. Item B. 3 .d (page 8) - Perforated groundwater interceptor pipes will need to be placed behind the wall to prevent fluid pressure buildup. These pipes will then need to be routed to an approved storm drainage facility. --1111/11 E-DEVELOPMENT INFORM ION FEDERAL WAY BUILDING SEC1 661-4118 1/(c_i-a(`(A,c' uJ4 ( VA" PROJECT N E OCCUPANCY TYPE CONSTRUCTION �c1fG 2( 1. Submit with completed application for permit, ` complete sets of plans of 24"x36" maximum dimension(include architectural, structural,electrical,drainage,utilities,and landscaping). Provide three each 81"x11" and three full size site plans for addressing multiple building sites. 2. At submittal provide two sets of structural calculations prepared by a professional engineer, registered in the State of Washington.iN C--f" S 4r114,7 r F t( 3. At submittal provide two copies of soil investigations and reports, as specified in Chapter 29 of the Uniform Building Code. 4. At submittal provide two sets of energy code calculations, including lighting budget. Washington State Energy Code (1991). 5. Provide two copies of King County Health Department approved drawings. _ 6. At the time of submittal, those regulations which are currently in effect shall be applicable to all project plans and specifications. The City of Federal Way has currently adopted all Uniform Codes, 1991 editions. — 7. Washington State Disability Free Standards apply (WAC 51-20). _ 8. Special inspection by an approved testing laboratory is required for site welding, high-strength bolting, piling operations,sprayed-on fireproofing,structural masonry,and cast-in-place concrete. Include testing . lab selection and personnel credentials with building permit submittal for Building Section approval prior to construction (must be WABO certified agency and inspectors on January 1, 1994). _ 9. Separate permits are required for demolition, signs, rack storage, rockeries, etc., refer to Washington State Department of L & I for electrical permits. Plumbing and mechanical should be included on the main application for permits, described in !11 above. 10. Revisions to submitted drawings will be subject to additional plan review fees, if on larger sheets than 81h"x11". 11. Minimum estimated fireflow.(gpm) • 12. Provide TWO FULL SIZE SITE PLANS APPROVED BY THE FEDERAL WAY POSTMASTER, showing approved locations, when installing gang-type mail boxes. 13. No building or portion of a building shall be occupied or used for storage prior to the issuance of the CERTIFICATE OF OCCUPANCY. X14. No work shall start prior to the issuance of the permit. K 1 . Other: TGA S S r-' y ' 6 r ( 2_- ( - q3 Lc>t, _. PREPARED BY DATE rREDEV. ' 32.6 i.N4.6 /� I \i / /70.8 �/ '� X X , X 76., / I � X / 2.0 67. / 32.8c;) X 32, X / X x67.3 75.7 // x �/� X // AO x 31.64 - 4 /63.3 / / / .•�. Le__ -, e 5OX31.9 31.4 . �� X 76 .1 63.4 / /XX 59.4 .- -- - -. )31.6 / X cl))/ X 60.7 200.E / X / � / / /. i 7 / // x x 58.6 �/ �// / ie �/ / /57.2 ,/ 57.9 �/// �� / •• 4800.11,1009.8 X � 0111111k. � � 213.8x XIff 10PIST 21.8 � /�� 1 220 /�/ , 227.1 dir ' //l/( / ' iiiiiik X 227.2 227.4 r :) 14 It , - _ 228.0 X x 231 238.4 X 227.6 X7'1 x 227.3 X 1 . 242. 153.2 X ] :' 180 ‘kft 227.2 X 152.1 Si 15 x 411r1IIIIIIIIII196.9 9.3x x207.X 4 152.3 x151.8 X ilm m r ii. 157.5 eV05.9 arf, X 241.7 , I FT Ca N Ta - Emma_ FEDERAL WAY AERIAL MAPPING PROJI FEDERAL WAY, WA 98003 CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT MEMORANDUM DATE: November 18, 1993 TO: Community Development Review Committee (CDRC) Members Kathy McClung, Land Use Administrator Ron Garrow, Senior Development Engineer Dick Mumma, Building Official Rick Gilmore, Supervisor of Technical Services, FW Water and Sewer Pat Kettenring, Assistant to the Fire Marshal, KC Fire District #39 Tina Piety, Administrative Assistant FROM: Bill Kingman, Associate Planner '"� PROJECT PLANNER: Bill Kingman PHONE: 661-4110 PLEASE RESPOND BY: December 2, 1993 ********************************************************************** FILE NUMBER: SEP93-0023 PROJECT NAME: Chrzanoski Retaining Wall PROJECT ADDRESS: 610 South 288th Lane PROJECT DESCRIPTION: Construct 80 foot long retaining wall. APPLICANT: Mr. Mario Morales, 10860 NE 3rd Place, Bellevue, WA 98004 PHONE: 646-3473 NOTE: This SEPA review relates to the building permit #BLD93-1146 for the retaining wall. ogruep ,tt9lLt Q 0/l6113 fit`, I((. pc:G 'a -e �,� 4.51_Grv3 SEP9323.MEI RZA AGRA, Inc. 133 NE 122nci �'''a'" Suite 100 Engineering S Envircnmen:al Services Kirkland, WA 98034-6918 (206) 820-4669 FAX (206) 821-3914 25June 1993 11-08969-00 Paul Davis Systems 10860 N.E. Third Place F ILE Bellevue, Washington 98004 Attention: Mr. Mario Moralis Subject: Chrzanoski Residence 610 S. 288th Lane Federal Way, Washington ( Gentlemen: This letter presents the results of our subsurface investigation and geotechnical recommendations at the } Chrzanoski residence at 610 S.288th Lane in Federal Way,Washington,approximately as shown as our Site Vicinity Map, Figure 1. The approximate location of the boring for this evaluation along with the surficial features observed are shown on the Site and Exploration Plan, Figure 2. A boring log with interpretive description of the subsurface conditions encountered at the boring location is also enclosed. The information in this letter was prepared in accordance wtth the scopeof work in our proposal dated 8 P Pa P Po June 1993, in accordance with generally accepted geotechnical practice. This information is for the exclusive use of Paul Davis Systems, and their agents, for specific application to this site. SITE DESCRIPTION The project site is located at 610 S. 288th Lane in Federal Way, Washington. All directions in this letter assume that 288th Lane in this area is running north-south. The existing residence is located west of 288th Lane. Behind the house is then approximately a 15-to 20-foot wide rear yard, surfaced with washed rock over plastic sheeting. Past the washed rock is a railroad tie divider. Behind the divider is an existing hedge behind which is a steep slope down to the residences on Redondo Beach area. To the north of the subject property is approximately a 3-to 4-foot high rockery behind which is a newly landscaped yard with grass. At the far western side of the newly grassed yard is a railroad tie retaining wall with a planter area. At the base of the planter area are several 6-inch diameter drainage pipes headed down the slope. At this time, AGRA Earth&Environmental Group 1 y. Paul Davis Systems 11-08969-00 25 June 1993 Page 2 it appears that these drain pipes discharge onto the slope. In general,the grassed yard slopes towards the west-southwest. It appears that some of the surface water from this area is entering the residence's yard. To the south of the residence is some vegetation before the next residence to the south. It appears that the majority of the drainage for the subject residence Is directed towards the south over the plastic sheeting/washed rock surface and empties into an existing catch basin located along the southern property line. This catch basin then appears to drain to the west down a drainage line. The actual outfall of this drainage line is not known, but appears not to be on the slope (since no erosive damage to the lower slope was observed in this area). However, at this time some water appears to be running over the side of the slope below the subject residence, and not being directed into the catch basin. This water appears to probably be coming from the residence next door to the north. At the time of our site visits, it appeared that approximately the central third of the shrub line had dropped approximately 4 feet down from previous rear yard (washed rock elevation) grade. In general, it appears that between 2 to 4 feet of the surficial soils have slid down the slope. Several slump blocks were observed on the slope. A seepage zone was observed approximately 4 feet below the top of the scam below the residence, approximately coincident with the base of the upper slump. The source of this water is not known at this time. There is another seepage zone approximately 50 feet below the slump block. Along the south side of the slump area are several more open fracture, possible slump blocks forming. To the north of the slump block the area is very heavily vegetated with blackberry bushes. Just north of this area appeared to be a possible active slump block. It appears that the slope had been marginally stable before the introduction of the water. SUBSURFACE CONDITIONS A subsurface investigation was performed on 14 June 1993 by drilling one boring at the approximate location shown on Figure 2. The boring was advanced by a portable Acker drill rig which advanced hollow stem auger. Standard Penetration Test samples were taken at 2.5 foot depth intervals during drilling. The boring was drilled on the top of the 4-foot slump block just below the washed rock backyard. Subsurface conditions encountered at this location consisted of approximately 1 1 feet of gravelly, cobbly sand fill. Below the fill was approximately 5 feet of loose to soft,wet silty fine sand to fine sandy silt. Below the loose sand was then a very stiff silt with some fine sand to a depth of approximately 11 feet. From approximately 11 feet to 15 feet was a dense, very fine sand. Below the dense layer of sand was then a hard silt to the final depth explored of 18 feet. No groundwater was encountered at this time,although a very wet zone was encountered from approximately 4 to 6 feet. +' �^ AGRA 1 Earth&Environmental Group Paul Davis Systems 11-08969-00 25 June 1993 Page 3 CONCLUSIONS AND RECOMMENDATIONS At this time It does not appear that the existing slide presents a current danger to the existing residence. It is recommended that some remedial action be taken as further slope movement could endanger the residence. It is felt that controlling the surface water will improve the slope stability. It is our opinion that most of the slope instability is due to the introduction of water to the slope. It appears that the four foot drop was caused by the surficial slide of the slope immediately below the drop. It is likely that this slumping is being caused by the introduction of surface water to the slope. To a lesser extent, it may be that the lslope instability is being aggravated by groundwater seepage through the sandy soils atop the silts in a westerly direction across the site. In order to reduce the risk of slope instability, it will be necessary to route all surface water sources away from the slope, or fully collect the flow and tightline it into a suitable outlet at the base of the slope. To facilitate this, the slope from the edge of the yard should be sloped towards the residence to a drainage swale which should be sloped to the existing catch basin. All surface water coming fkrim the neighbors to the north should also be routed to the catch basin. The drainage swale should be lined so that no water is introduced to the soils. The location of the outlet of the drainage basin should be confirmed. It also appears that the existing drainage conduits from the neighbor's residence to the north will need to be tightlined to the base of the existing slope. Once the water is removed from the slope, the slope should be revegetated with native vegetation so as to try and prevent soil erosion. We understand that it is proposed that a retaining wall be put in so that the backyard grades can be raised to the previous elevation to return the yard to its former condition before the slump occurred. Cantilevered soldier pile with timber lagging could be used for this purpose. Due to the unstable nature of the near- surface soils, conventional retaining walls would not be possible at this site. Due to the existing residence mass excavation to install reinforced earth retaining walls would not be practical either. The cantilevered soldier pile would probably return the slope to its previous safety factor before the slide,which was probably safe but below standard engineering design criteria for safety factor. To fully stabilize the yard from further slope movement it is likely that a cylinder pile wall would need to be constructed at the top of the slope. This report will give recommendations for the soldier pile design. The cylinder pile design was beyond the scope of work of this project. It is likely the cylinder piles would need to be approximately 30-40 feet deep to provide horizontal resistance. Below are the recommendations for the cantilevered soldier piles and timber lagging retaining system. This shoring system can also be upgraded to serve as the permanent retaining wall system itself. The structure should be designed using passive earth pressure. Even with use of the passive earth pressure, some settlement of the soil retained immediately behind the system should be anticipated. Embedment depths AGRA Earth&Environmental Group Paul Davis Systems 11-08969-00 25 June 1993 Page 4 of the soldier piles will need to be designed to provide adequate lateral or `kick our resistance for the horizontal loads being applied by the additional fill. For design,the lateral resistance may be computed on lthe basis of passive pressure acting over twice the diameter of the concrete and soldier pile spacing, whichever is less. A passive pressure of 250 pcf, expressed as equivalent fluid pressure, may be used in design. Passive resistance within the upper 6 feet of soil of the existing grade should be neglected,due to the slope and its loose and disturbed state. An active earth pressure of 55 pcf should be assumed to cut on the upsiope side of the wall. We recommend lagging or some other form of protection be installed in all areas. Due to soil arching effects,temporary laggings may be designed for 50 percent of the lateral earth pressure used for soldier pile design. Prompt and careful installation of lagging will reduce the potential for loss of ground. We recommend that any voids between the lagging and the soil be backfilled. The above parameters could be utilized by a structural engineer in developing an appropriate design for an about 4 to 6 foot high cantilevered soldier pile wall. Depending on embedment depths required for design, a deeper exploratory boring may be required for confirmation of assumed subsurface conditions at depth. These values should also be reviewed if a higher wall is planned. Drainage behind the wall must be maintained, collected and tightlined to a suitable outlet at the base of the slope. Groundwater was not noted, except at the base of the 4 foot slump block. Assuming surface water sources are controlled, any groundwater could exit through the timber lagging or weep holes. CLOSURE The conclusions and recommendations presented in this report are based on the explorations accomplished for this study. The number, location, and depth of the exploration was completed within the site and scope constraints so as to yield the information to formulate our recommendations. The integrity of the retaining structure will depend upon proper site preparation and construction procedures,including dewatering of the slope. We are available to provide geotechnical engineering services during design and construction phases of the project to minimize delays as the project develops. AG RA Earth&Environmental Group I Paul Davis Systems 11-08969-00 25 June 1993 Page 5 I We appreciate the opportunity to be of service to you on this project. If you have any questions, please do Inot hesitate to call. IRespectfully submitted, 1 RZA AGRA, Inc. yet ,"^: :` , LL11rr YYY' \ I Larry A. Boge, P.E. �ti` .; ; Project Engineer I I EXPIRES S ' yLi Ir....y Jo' g o i3A,c f r s;f mes S. Dran• d, P.E. `y • IAssociate litl.� f^ '. .. '. :y LAB/JSD/DLO 4.''". �.1,4 , '`*A EXPIRES 12/19/ q3 1 Enclosures: Figure 1 - Site Vicinity Map Figure 2 - Site and Exploration Plan l Figure 3 - Cross-Section Boring Log B-1 I 1 1 l J A G P. A Earth&Environmental Group • t � 05 H PL 260T� � s7001H -moo ST s 7,....4 YI r Pi. T, .. > 40> s„r S26151PL >I • V7 S 2e2aD z - ! 2 -.P1•�, NI 22 S 2S3RD- alj-' pQ• =.}x3RD PL < "+ OOP s•�e� s a�Tn S7 Q L 8 S j 26 1 i g 29 S zasTH z e S=26 v000rroHT BEACH `" r I ti PARK ~ s. N - _ .-. --__ -.--_j . . i'' - f PRIVATEI 4:: 2,46) HvooAwR7 TH — —_ - —. - - - ' J $ •.i./ARK =y.-o- ' -} Q•, •" ^6BT^ ST 1 I t't'Tor e Z;� < < N < >� 1=S Z .] MT < V I 0 S 270TH PL - <P 0 = ,' , Eilis I Q STAR LAKE Q. N PARK b Ripe G - a S z S 21•JRD r••• • • Iril fl4r A•T. I I > CT ?<+ ♦�'r'� K • ,vim WV s hl•L�I'S �. �(1 N 4 = Mont 41f I I •• F. 4 27SjH27¢TH �,' •`b! 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K n«n . - ( tv :Z:'/MK�iT. j•: CHRZANOSKI RESIDENCE RZA-AGRA WO. W-8969 FEDERALWAY, WASHINGTON ENGINEERING 8 ENVIRONMENTAL SERVICES DESIGN 1 AB 11335 N.E. 122nd Way DRAWN DMW LOCATION MAP Suite 100 DATE JUN 1993 i Kirkland, Washington 98034-6e16 SCALE N T S FIGURE 1 I WZ Cl�Lu Z I CC2Z < M W = 0 C7 N U. 0 Y3 v cc 0 y} W z; • N a� co _- 0 to U w V J W LWi. W U �p N_ Q ZZX J Q r >W a CC I 0 CCw m CC W w m Z -i W a I cn 0 oc \ N >_w o� \ Q 0 6 \` 0CC a < M Z Ci z N WW z z u, 44 -I W p cn ¢ I-- Q \ mac' coQ 3 0 0 0 � I%\ u. \ D cf) co W \ Wcc \ W cn W 3 Z e (t? N i o \ Qz 3,a \ < w w �. \ a 1 Z ��1p W C8 \ CC W COV/ N w N a N O N CO z \ Ill -' w 1 0 -J l a a co \ E co w \` 0 N• I PROJECT: Chrzanoski Residence w.o. W-8969 BORING NO. g- i 1 1 1 STANDARDPENE'IRATION RESISTANCE I Page I SOTI.DESCRIPTION < - stow.pa too( oi < q I A Approximate ground surface elevation: T., v 3 0 10 ao 30 40 so TESTING I 0 - - . Gravelly,cobblySAND(Fl ��I1)' Y Loose/soft,wet to saturated,gray/brown,silty, ` _ fine SAND to fine sandy SILT S-7 J t ._ ` 5 S-2 : T Very stiff,moist,gray/brown,SILT with some fine - sand with thin sandy laminations I - Hard,fine sandy SILT with some fine sand S-3 - r r--" 10 Dense,moist,brown,very fine SAND Wet,silty,flue SAND I �b I J 1 I Hard,moist,tan,SILT - S-6 - 1 Grades to hard,gray,clayey SILT �7+ 62 IBoring terminated at approximately - - 18 feet 20 — — 1 — . I. 30 O • 10 20 30 .W 60 LEGEND MOISTURE CONTENT i • i IPlastic limit Natural Liquid limit 12-inch OD split-spoon sample RZA AGRA, Inc I Engineering&Environmental Services 11335 NE 122nd Way,Suite 100 Kirkland,Washington 98034-6918 1 Drilling started: 14 June 7993 Drilling completed: 14 June 1993 Logged by: CCC II • • RZA AGRA, Inc■ 206)113t 35 NE 122nd Way Engineering & Environmental Services Kirkland, WA 98034-6918 COMMUNITY20-4669 EVE OPMENT DEPA EIVED BYiRrr 206) 821-3914 22 December 1993 DEC 2 3 1993 11-08969-00 Paul Davis Systems 10860 N.E. Third Place Bellevue, Washington 98004 Attention: Mr. Mario Moralis Subject: Seismic Concerns Chrzanoski Residence 610 S. 288th Lane Federal Way, Washington Gentlemen: This letter concerns the seismic hazard of the proposed new retaining wall at the Chrzanoski residence requested by Mr. Mario Moralis as, in turn, requested by Mr. Bill Kingman of the City of Federal Way. We previously performed a subsurface investigation for retaining wall recommendations in our report dated 25 June 1993 for Job No. 11-08969-00. In its current configuration, the slope is in a marginally stable condition. Based on our studies, it is likely that a moderately strong earthquake would result in some displacement of the existing slope. Construction of the new wall will increase the safety factor against hillside movement during an earthquake event. Conventionally, designed retaining walls possess an adequate safety factor to resist transient loading imposed by substantially large earthquakes. Therefore, the new wall will reduce the risk of damage in the event of a seismic occurrence. We trust this letter is sufficient for your current needs. If there are any questions, or if you require further information, please do not hesitat calk A ,40 Respectfully submitted, 44��01 RZA AGRA, Inc. phi C;?Or telt7 G� G4i^ G' A � G 3 Larry A. Boge, P.E. ` �` Project Engineer ,PIRESm�sic! /AO DRA. s ames S. Drans ield, P.E. 40 III4 4 r Associate E74` y'r o " : . LAB JSD ahvt "0 �GIr, IONALE AGRA Earth&Environmental Group 5 EXPIRES 12/19/ ROCKERY . , SUBJECT RESIDENCE • II I - CATCH BASIN NEIGHBORS RESIDENCE ,., ;,I, DECK ___ t+, EDGE OF TERRACE � -� ,/ ( �� VIRTUALLY UNSUPPORTED 'SLOPE 2 80% ` WASHED ROCK OVER ', / n VISQUEEN ON TERRACE p (� / +VI, LANDSCAPED YARD \` �} V P OVER SLOPE / V r _�/ • . RETAINING WALL O^ -TT BB SLUMP / •/ LOCK OPEN FRACTURES CONDUIT DRAINAGE it APPROXIMATESCARPIP TOP OD&F f B-1 / MINERAL SOIL EXPOSED OF WALL- /„... 2X4 RETAINMENT- \\ OOBSERVEDUTFALL T 3'HIGH) // ) \11, � \\\ \\ `\ \\ / \ SLUMP BLOCK \ \\ A SEEPAGE ZONE 4' BELOW TOP OF SCARP r OPEN FRACTURES STEEP BANK BREAK,\ \POSSIBLE PAST >' ' -+y / ACTIVE SLUMP BLOCK THICK BERRY BUSHES / \ 80-100%SLOPE i \ SLUMP BLOCK RECENTLY ACTIVE 1 DEBRIS SLIDE SURFACE.VERY J \ \ITTLE VEGETATION \ / \ �i \ /G07� _ LEGEND \ \ J Q0.- E9 BORING NUMBER AND APPROXIMATE ( yam LOCATION \ .......-/ / < INDICATES DIRECTION OF SLOPE THICK BERRY APPROXIMATE DIRECTION OF BUSHES / ~'—. WATER FLOW WA 1 g, L Al A A' DESIGNATION AND APPROXIMATE �Q i LOCATION OF GENERALIZED ` SEEPAGE CROSS SECTION ZONE RZA-AGRA CHRZANOSKI RESIDENCE WO W-89819 FEDERAL WAY, WASHINGTON ENGINEERING£ENVIRONMENTAL SERVICES DESIGN LAB 11335 N.E. 122nd Way DRAWN MAX_ SITE & EXPLORATION PLAN Suite 100 Kirkland Washington DATE JUN 1993 98034-6918 SCALE IJ.T.S._ FIGURE 2 /pit,„ �. _- Z kL 4� t L r Z. �.A W -c. I J _ I / as- �6 07 �CI• ,M,e!aJ'71' �� /��T.Ser'LA :�/-A>'h r¢60 /q'Tefio,•; %�/»'n•ilibrYj eY:1Gint�ftr... A7'fh�//4 G tk L'n aTs �' .i x i. +�� '� 'Y of 172: ninn/Y1H/1� 'i;ST• / Qa/o 1rjL,iilSne/ These design plans and calc'rl Lions are proprietary information, produced for anchlnred w?G installation �y ,Nicholson Construction of Tacoma, Wachingt' r. This information shall be. used only with the written permisal,in or Nicholson Construction. 1 % QA PRINTED ON NO. 1000N CLEARMNT �7 17N1 -mil Ale. - �a.-s•o•J �. F• //e� �� I 1 J-/s" ems,• ,off,., , ram,-bp---,''� �nc%d+r ,'gym FILE .------TE ' .E A.� • rT Orui(�a Grit la l�tdtde "t'' he ,M manent anchc-ed wall was obtainea from the • •'y kt.e,- by kZA Z a, ln,,. dated June 25, i993. 2' A I methods 'W n*tiN' requites 'nts. , - shc.l! cor°orm to the current King County buil(t;ng code _ y variation front grades ich wt •old tr d' "/ this Jesign shall be reported to this Engineer. 4. All bear* Pes And steel ''es shall conform to ASTM A572 Grade 50. 5. QtAi''bPLTSp{jDd� a• Anehoe t6WOM SW ; I50 ksi Ih►ell(WIrt cortorm o' )70 ksi 'even wire strt"ids conforming to ASTM A416 b. Anchor tendons shall be do- to ASTM A/22. or , , corrosion protected. 6. QMf a• All methods and materials requirements ibr reinforced ( a:' conform to the latest edition of the ACI building code • b. Neat cement groin for the ti Type UII oeme,tt :rete. X.r ;'le embedrn _ A and tieback anchors shall be a composed and water strength with 28 daya cane ti of ac rato - b.a5) ano shall ce• elop a 3,00(. psi nut-mumtcube .. 7 er La¢tan¢ a. Tim; er lagging shall be rout -r Douglas Fir Larch No. shall be seated with pteserva, 2 or better (Fh = 1,25J ,si) and c , .; Lccorda.ace with At:VYI ytar4: rd Specification LP-22. 8. Wgl�q All welding shall be perlbrmet '.y cert;:izi I3 9. Tieba�hor,l a. Anchor st,essing art testn:p Institute's "Recenunendahctn, :, a.t 1... ., axordance with the Post -Tensioning b. One each production anrho: _'' `i 1 `r l f ` 1Chors. ll oc anchor s'<ir, friction. , , ot the design load to verify the design c. T'he re.-r - At maximum teat load == 3� " f to - At design load = 60 % of the - gu IT, ed t.a;imate tan 'le st: Lngth. t. rat;tcec' e. Installation and grouting pit ult:., ae }ensile strength. dotes shall Construction Co.. tie selected by tee Contractor, Nicholson f. In the event of the fzHure of a t; ')ark to actl:eve tLe load attained shall be recor9ed..his required p: onf test lead the ultimate test anchor sha'l be assigrec of the ultimate test load, Ana , of the required design 4 � thing :oa . e lt,al ;o 5- tonal anchc r shall be installed which shall anon the oalance toad us p! 33 .o proof load, 10. Obsetvanionandtnspection b: z qualified inspector shall be provided by the owner. L-aw•u�a �ao/ tTh.a.�j � ',fin • T� o0or+ :.� - r+ne�G •'0 1J� Y[� / WY F FFUaRAL WAY DEFT. OF CC IMLINtTY JEVELOPMEMT PERMIT NUMBER_ ADDRESS L /(i >[J< '' /-/j PLANS FOHi OWNER /4/�11,'_',5. C'�%'7f/v��, i DATESUBMITTED fL, .,, , . PATEAPPROVED /3sr:✓E_ /�.ssEoi-c_ p r f/f .2cys� ON.•I• � s �'/• ioo.q; xP1 CL UI QL' UI'Q3 h�c1� ✓c_ ��J f �' �' e- -- ?a-t1c �2c�;nq a✓ar• '.Z'/C Q5 N'r1t 1 ,t j APPN(.:Eo By; - `•- -- orAWN o• �.r2a.nOSkt N. JISED 93•lDJ994s6 6Jsj93 oaoa 11Aw'Ir1G NJ•H 6cl.