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Home My WebLink About02954 - Technical Information Report TECHNICAL INFORMATION REPORT Eden's Garden Renton, Washington June 18, 2001 Revised August 9, 2001 Our Job No. 7535 1 / „ '�' �,L/� ,� . G ,�1 � � . U�� P�'o`n+^s,,, � �' � �� °� � Z � � '� 23975 Q' 'AO '�G�STER�`��i �SSIpNAI.E�G •7• �� GHA VS �i�s:�-�a mP �I� �.� CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES ;,�__ 18Z'I 5 72ND AVENUE SOUTH, KENT,WA 98032 . (425)251-6222 . (425)251-8782 FEvc � � i www.barghausen.com o''.` �I/,►1` ,. <��G�G�N� � �,c--r/ 1.0 PROJECT OVERVIEW Eden's Garden is located in the Southeast quarter of Section 5, Toarnship 23 North, Range 5 East, Willamette Meridian,City of Renton, King County,Washington,more particularly described as located in the 2400 Block, on the south side of N.E. 20th Street between Camas Avenue N.E. and F�lmonds Avenue N.E. See Exhibit "A" -Vicuuty Map within the downstream analysis in Section 3. The existing topography of the site is fairly undulating in nature,with slopes varying from 1 to 40 percent on the project site. The 40 percent slopes consist of a small portion of the site,located in the southeast portion. For the most part, the site slopes in a northwesterly duection into a closed depression located in the northwest corner of the site. An e�sting house with associated garage and outbuildines is located in the northeast corner of the site. The remainder of the site is covered with trees and brush. This project proposes to develop the approximately 3.4-acres site into a subdivision of approximately 201ots. Street improvements are also proposed for the south side of N.E. 20th Street, which will entail the construction of sidewalk,curb and gutter, and asphalt. The proposed site is surrounded by existing developments consisting of detached single-family residences. The closed depression located on site is the drainage point by infiltration for a contributing basin of approximately 15.2 acres. For the purposes of the calculations for the proposed infiltration facility, this project assumes the upstream basin and on-site basin to tota15.92 acres of impervious and 9.28 acres of outwash grass. A wet vault is proposed for the treatment of stormwater runoff prior to infiltration in accordance with the 1990 King County Surface Water Design Manual (KCSWDM). The infiltration pond has also been designed to infiltrate the 100-year storm event per the 1990 KCSWDM. Should the infiltration facility ever fail,it would be conveyed into the e�sting storm system via a Type II catch basin with a bird cage lid. If the underground storm line was to fail, runoff would tend to flow off the southwestern property line and flow in a southwesterly direction through a channelizeri area consisting of existing residential developments and collected in pipe conveyance systems located within the streets downstream from the site. 7535.009[DEDfmm] 1.1 Technical Information Report Worksheet King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNEFi'AND ' Part2 PROJECT LOC,4TION AN� ' ___ _. _ ... _ PROJECI"ENGIN�ER UESCRIPTION Project Owner Lyle Homes Project Name Eden's Garden Address 11555 S.E. 8th Street, Suite 140 Location Bellewe, WA 98004 Township 23N Phone (425) 646-6311 Range 5E Project Engineer Hal P. Grubb, P.E. Southeast Quarter Section 5 Company Barqhausen Consulting Engineers, Inc. Address/Phone 18215-72nd Avenue South Kent,Washington 98032 (425)251-6222 _ _ _ __ _ Part 3 TYPE O� PERMtT Part 4 OTNER REVIEWS AND PERMCfS ' APPL1CATiQN , ❑ Subdivision HPA ❑ DFW HPA ❑ Shoreline Management ❑ Short Subdivision ❑ COE 404 � Rockery � Grading ❑ DOE Dam Safety � Structural Vaults ❑ Commercial 0 FEMA Floodplain ❑ Other ❑ Other 0 COE Wetlands Pari 5 Sll'E COMMUNITY AND DRAINAGE BASIN ' Community Cihr of Renton Drainage Basin Closed Depression 7535.009[DED/mm] _ _ _ _ _ __. . _ __ _ _ _ __ _ . _ . _ ....__ Part 6 SITE CHARACTERISTI€S ❑ River ❑ Floodplain ❑ Stream 0 Wetiands ❑ Critical Stream Reach 0 Seeps/Springs � Depressions/Swales � High Groundwater Table ❑ Lake � Groundwater Recharge � Steep Slopes Small Area of 40% 0 Other _ . _. _ _Part7 SQILS : Soil Type Slopes Erosion Potential Erosive Velocities Indianola 4%to 15% Loamy Fine Sand ❑Additional Sheets Attached Par#8 DEVELOPMENT UMfTATIONS'' ' REFERENCE LIMITATION/SITE CONSTRAINT � Ch. 4- Downstream Analysis Closed Depression ❑ ❑ ❑ ❑ Additional Sheets Attached Part 9 ESG REQU►REMENTS' ' MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION � Sedimentation Facilities � Stabilize E�osed Surface � Stabilized construction Entrance � Remove and Restore Temporary ESC � Perimeter Runoff control Facilities � Clearing and Grading Restrictions � Clean and Remove all Silt and Debris ❑ Cover Practices � Ensure Operation of Permanent Facilities � Construction Sequence ❑ Flag Limits of SAO and open space ❑ Other preservation areas ❑ Other 7535.009[DID/mm] _ _. _ _ __ _ ____ ___ __ _ _ _ __ _ ___._ . _. ..____ _ _ _ _ __ _ __ _ __ __. . . . _ _ _ __ .. _. __ _ _ _ _ _._ _ __ __.__ Rart�D SIJR�AGE WATER SYSTEM. ❑ Grass Lined Channel ❑ Tank � Infiltrafion Method of Analysis � Pipe System � Vault � Depression KCRTS Compensation/M itigation ❑ Open Channel 0 Energy Dissipater ❑ Flow Dispersal of Eliminated Site Storage 0 Dry Pond 0 Wetland 0 Waiver � Wet Vault 0 Stream ❑ Regional ' Detention Brief Description of System Operation Stormwater controlled by catch basins and conveved via pipes to underqround vault for detention and water quality. Facility Related Site Limitations Reference Facility Limitation _ #'art 11 ST'RUCT"URAL ANALI'S1S Part 12 EASEMEfV'TSlTRACTS' � Cast in Place Vault ❑ Drainage Easement � Retaining Wall ❑ Access Easement � Rockery>4' High ❑ Native Growth Protection Easement ❑ Structural on Steep Slope � Tract ❑ Other 0 Other Part �3 SIG�fATURE O�PRQFESSIONAL ENGINEER I or a civil engineer under by supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is acc ate. � ' �•O SignetYDate 753�.009[DED/mm� I 2.0 PRELII�IINARY CONDITIONS SUMI�IARY Following are responses to the Hearing Examiner's cotiditions of approval dateci April 26, 2001: 1. The plans are in compliance with tbe conditions imposed by the ERC. 2. This condition will be met with the recorcling of the final plat documents. 3. A survey for hazardous substances has been completed by ADaPT Engineering,Inc.,dated May 7, 2001. This report has been included w�itivn Section 6 of this rer�rt. 4. This condition will be met with the approval of the fmal plat. 5. A Homeowners' Association or maintenance agreement will be prep.u-ed concurrently with the recordin�of tbe fmal plat. 7535.009[DID/mm] � 2.1 Hearing Examiner's Report � 7 �� April 26, 2001 OFFICE OF THE HEARING EXAMINER CTTY OF RENTON REPORT AND RECOMMENDATION APPLICANT: Jack Willing Lyle Homes 1601 114`h Street SE, Suite 100 Bellevue, WA 98002 File No: LUA01-007,PP,ECF LOCATION: South Side of NE 20�' Street; between Dayton Avenue NE& Camas Avenue NE SUMMARY OF REQUEST: Subdivide a 3.41 acre parcel into 20 lots suitable for construction of detached, single family houses SUMMARY OF ACTION: Development Services Recommendation: Approve with conditions DEVELOPMENT SERVICES REPORT: The Development Services Report was received by the Examiner on April 3,2001. PUBLIC HEARING: After reviewing the DeveIopment Services Report,examining available information on file with the application, field checking the property and surrounding area;the Examiner conducted a public hearing on the subject as follows: MINUTES The jollowing minutes are a summary of tJre April 10, 2001 hearing. The legal record is recorded o�:tape. The hearing opened on Tuesday,April 10,2001, at 9:01 a.m. in the Council Chambers on the seventh floor of thP Renton City I-Ial�. Parties�vishing to testify were affi-ried�y t;ie Examiner. The following exhibits were entered into the record: Exhibit No. 1: Yellow file containing the original Exhi6it No. 2: Proposed Plat Plan application, proof of posting, proof of publication and other documentation pertinent to this request. Exhibit No. 3: Neighborhood Map Exhibit No. 4: Zoning Map Exhibit No. 5: Colored Site Map showing protected slopes The hearing opened with a presentation of the staff report by Leslev Nishihira, Senior Planner, Development Services, City of Renton, 1055 S Grady Way, Renton, Washington 98055. The applicant has proposed the Eden's Garden Prelimin�_�Plat File No.: LUA01-007,PP,ECF April 26, 2001 Page 2 subdivision of a 3.41 acre site into 20 lots intended for the development of detached,single-family residences. The site is currently developed with a single-family residence,along with the associated detached accessory structures,all of which are proposed to be demolished as part of the proposal. The site is located within the R-8 Zone. The proposed lots would range from 4,525 square feet to approximately 7,451 square feet in size. The project includes the installation of utilities and the dedication of a 42-foot wide residential street extending from NE 20'" Street. The proposed right-of-way would terminate in a cul-de-sac after a length of approximately 420 feet. The project would include approximately 6,500 cubic yards of earthwork,as well as the removal of several trees. The project was presented to the Environmental Review Committee on March 13, 2001. "The ERC issued a Determination of Non-Significance—Mitigated,which included 10 mitigation measures. A fourteen day appeal period followed this determination,during which no appeals were filed. Of the ten mitigation measures, numbers 1 through 7 app(y to the topography of the site. Measures 8 through 10 are the typical Fire,Traffic, and Parks Mitigation Fees applicable to the project. Ms.Nishihira reviewed the project's consistency with Preliminary Plat Criteria. The proposal is located within the Residential Single Family designation. The objective established by the RSF designation is to protect and enhance single family neighborhoods. The proposal is consistent with this designation in that it would provide for the future construction of single family homes and would promote goals of infill development. Densities in the R-8 Zone are required to be a minimum of five to a maximum of eight d�velling units per acre. Net density is calculated after deducting critical areas and public rights-of-way from the gross acreage of the site. After the deduction of the roadway and the protected slope area,the net density would be 7.17 dwelling units per acre, which is within the required range of the R-8 Zone. The proposed plat would create lots ranging from 4,525 square feet to approximately 7,451 square feet,which is within the minimum lot size required. T�he subdivision regulations require that side lot lines are to be at right angles to street lines. All 20 lots of the proposed plat are at right angles to street lines. Each lot would have access to a public right-of-way. The proposed lots also comply with the R-8 requirements for minimum lot width and minimum lot depth. The appropriate front and rear yard setbacks of 20 feet, interior side yard setbacks of 5 feet,and side yards along public street setbacks of 15 feet are indicated on the plan. When considering the required setbacks, as well as access points for each lot, the proposed lots appear to have sufficient building area for the development of suitable detached single family homes Access to the site is proposed via a residential street with a reduced right-of-way width of 42 feet_ 1fie street would include 32 feet of pavement and 5-foot sidewalks on both sides. The proposed street extends 420 feet south of NE 20'" Street, ending in a cul-de-sac. Full street improvements would be constructed as part of the project. As proposed, access to the site would not align directly with Dayton Avenue NE. The ne�vly created residential street would create an offset intersection of approximately 65 feet. The offset alignment is necessary for the project in order to avoid the creation of a large portion of unusable property and to allow for the creation of appropriately sized lots �vithin the density range required in the R-8 Zone. A traffic report, prepared by Gibson Traffic Consultants,�vas provided with the project application. Based on this report, the proposed alignment��ould not result in a potential hazard to traffic. Limited traffic volumes on the associated streets and the available sight distances are not expected to result in any potential hazards to traffic. Staff concurs with the report's conclusions and does not see a problem with the offset atignment. The initial set of plans submitted with the application showed a substandard cul-de-sac that did not meet minimum radius requirements. In addition,the proposed street included a reverse curve that did not comply�vith minimum separation requirements. As requested by staff, the applicant revised the plans for staff's review prior to the public hearing. Staff recommends that a Homeowners' Association maintenance agreement be established for the shared utilities. Eden's Garde�i Preliminary Plat FileNo_: LUAO]-007,PP,ECF i� April 26,2001 Page 3 I The proposal would result in an increase in traffic trips to the City's street system,therefore the Environmental Review Committee imposed a Traffic Mitigation Fee as part of the SEPA Determination issued for the project. The subject site is generally flat and is characterized by a gently sloping northern portion that slopes down to the central portion of the property from the east sides. With the land use application,the applicant submitted a Geotechnical Report prepared by AdaPT Engineering,dated May 3, 2000. The report concludes that the site is suitable for the proposed development provided that the recommendations included in the report are � incorporated into the design and construction of the project. T'he ERC required the applicant to comply with , those recommendations as one of the SEPA Mitigation Measures. The project would require approximately 6,500 cubic yards of earthwork,which would involve site preparation for the required improvements and I building pads, would utilize on-site materials and would not require the import or expoct of fill. Approximately 1,b06 square feet along the eastern boundary of the site which is located within lots 14 and 15 contains sloped areas at 40%with a vertical rise of 18 feet. These areas quatify as protected slopes, must be deducted for purposes of calculating density, and cannot be cleared, graded,etc. North and south of this area,also along the eastern perimeter of the property within lots 13, 15, I 6 and 17,are sloped areas of 40%with vertical rises of less than 15 feet. These areas are designated as sensitive slopes. Based on the Geotechnical Report's investigation of the site, no evidence of subsidence or slope instability was observed on the site. The applicant has indicated that the protected slope area would be set aside as a native growth protecion area, as required by the City's ' Critical Areas regulations. A nine-foot buffer around the protected slope area is also required to be planted with appropriate native species afrer the completion of all grading work. Temporary erosion control measures will be required to be maintained throughout the duration of the project,as well as weekly reports on the status and condition of the erosion control plan,and certification of the installation,maintenance and proper removal of the erosion control facilities. I Police and Fire Prevention staff indicate sufficient resources to serve the proposed development, subject to the payment of the required Fire Mitigation Fee. In addition, a Parks Mitigation Fee will be required. The site is located within the boundaries of the Renton Schoo) District. The project is expected to increase student enrollment by approximately 8.36 students. These students would attend Kennydale Elementary School, McKnight Middle School and Hazen High School. The school district has indicated that these schools would be ' able to support the additional students generated by the proposal. A Drainage Report prepared by Barghausen Consulting Engineers was submitted with the land use application. The report indicates that offsite surface water and surface water runoff from adjacent properties current(y collects and infiltrates on-site in a large depression located in the northwestern corner ofthe site. Drainage problems ha��e been knoti:�to exist i�t the area of the subject site. The applicant investigated tiie use of the abutting property to the south for use as an infiltration pond. However, due to field tests indicating porous soils at 10-foot depths, it was determined not to be feasible for use by the proposed plat. The project proposes to provide a drainage tract for an infiltration pond to accommodate current storm water runoff,which�vould be located in the northwest corner of the property. The facilities would be designed in accordance with the 1998 King county Surface Water Design Manual. There is an existing 6-inch water line in NE 20'� Street and two 8- inch water mains stubbed to the southeast corner of the parcel. The proposal includes the installation of a new 8-inch waterline, wl�ich would connect to the existing line in NE 20`h and would loop through the site and connect to the existing waterlines stubbed to the southeast corner of the property. Water System Development Charges based on a rate of$1,105.00 per sing]e family home��vill be required prior to the issuance of construction pennits for tlie subdivision. Staff recommends approval of the Eden's Garden Preliminary Plat, subject to the condition that a Homeowners' Association or maintenance a;reement shall be created concurrently�vith the recording of the final plat. � Eden's Garden Prelimin��y Plat � File No.: LUA01-007,PP,ECF April 26, 2001 Page 4 Larissa King, Barghausen Consulting Engineers, 18215 72"d Avenue S, Kent, WA 98032 stated that her firm had been working with the City on behalf of the applicant to address the issues relating to the proposed development. She clarified several items mentioned in the staff report and stated that the applicant agrees to both the SEPA and the Plat conditions that are listed in the Staff Report. Hal Grubb, Barghausen Consulting Engineers, 18215 72"d Avenue S,Kent, WA 98032 stated that his firm provided a preliminary design of the storm water facility for the project,incorporating the soils information that was prepared by the Geotechnical Consultant. The pond has been sized in accordance with King County's 1998 Manual. li is sized adequately for the entire drainage basin, which is 3 or 4 times larger than the size of the property. A final drainage report will be prepared which will incorporate additional calculations, in accordance with the King County Manual, for the City's final review and approval. Raymond Pinz,2000 Dayton Avenue NE,Renton, WA 98056 stated that his property is northwest of the proposed entrance to the project. He expressed concern with the tra�c situation in the area. Drivers exceed the speed limit by as much as 20 to 30 mph. Pedestrians using the sidewalks adjacent to this project would be in danger due to vehicles exceeding the speed limit. Mr. Pinz also expressed concem regarding storm water drainage in the area of the new project. Larry Samples, 1824 Camas Avenue NE, Renton, WA 98056 asked for clarification on the location of the proposed drainage retention pond. He owns two lots to the west of the proposed lots 7 and 8,and was concerned that the vacant lot next to his was to be used for the retention pond. He wanted to make sure this was not the case. Mr. Samples also expressed concern about fences bordering the property, and possible contamination of the site from past storage of heavy equipment and the dumping of concrete there. Kayren Kittrick, Development Services, 1055 S.Grady Way, Renton, WA 98055 stated that the drainage problems on tliis parcel have been accommodated by the calculations as provided. A final report is given at the time of issuance of construction permits to allow for any additional items that are found in the course of design. Ms. Kittrick also addressed the offset of the proposed road. While the offset is not ideal, it is within tolerances for a residential street. She stated that she will express the concerns about excessive speeds in the area to the City's law enforcement and Transportation Operations staff. Ms. King stated that the issue of previous dumping on the site was brought up as part of the Environmental Review on the project. She has done site visits and did not notice any evidence of spare mechanical parts or soil contamination. The project will comply with City recommendations if any soil contamination is found in the course of development. Soi} test�ng was done as part of the Geotechnicai Report, and no evidence of contamination was found. Mr. Samples stated that he was present when some of the soil sampling was done,and most of it was done in areas where the concrete was not dumped. T1�e concrete was dumped along the west side of the parcel from approximately lot 6 north. That area l�as been artificially raised approximately 6 feet higher than it was before the material was dumped tl�en covered with dirt. Ms. King cited a map from the Geotechnical Report showing the location of the test pits. Test pit#5 in located in the area of proposed lot 6. The report did not show that any kind of contaminant material was found. Mr. Pinz stated that he lived �pposite lot S of the proposed project from approximately 1963 to 1974. Prior owners of the site had a partnership with a trucking company. Draining of oil and various repairs were done to heavy equipment on the site. Mr_ Pinz wrote a letter to the City, resulting in the heavy equipment being moved off the site. Eden's Garden Preliminary Plat FileNo.: LUA01-007,PP,ECF Apri126,2001 Page 5 The Examiner called for further testimony regarding this project. There was no one else wishing to speak, and no further comments from staff. The hearing closed at 9:46 a.m. FINDINGS, CONCLUSIONS& RECOMMENDATION I Having reviewed the record in this matter,the Examiner now makes and enters the following: FINDINGS: 1. The applicant,Jack Willing for Lyle Homes, filed a request for approval of an 20-lot Preliminary Plat I together with one tract. ' 2. T'he yellow file containing the staff report,the State Environmental Policy Act(SEPA)documentation and other pertinent materials was entered into the record as Exhibit#1. 3. The Environmental Review Committee(ERC), the City's responsible official, issued a Declaration of Non-Significance-Mitigated(DNS-M)for the subject proposal. 4. The subject proposal was reviewed by all departments with an interest in the matter. 5. "rhe subject site is located on the south side of NE 20th Street. Dayton Avenue NE is located north of the subject site and if extended south would run along the eastern property line. Edmonds Avenue NE is located a block east of tne subject site and Camas Avenue NE is west of the site. 6. The subject site is approximately 3.41 acres in area. The parcel is rectangular. The subject site is approximately 588.52 feet long(north to south)by approximately 252.46 feet wide. 7. The subject site was annexed to the City with the adoption of Ordinance 1822 enacted in March 1960. 8. The subject site is currently zoned R-8 (Single Family- 8 dwelling units/acre). 9. The map element of the Comprehensive Plan designates the area in which the subject site is located as suitable for the development of single family uses. 10. There is a single family home and other structures on the subject site. These structures will be removed if the proposal is approved. 1 1. The applicant proposes dividing the subject site into 20 single family lots, and one tract that will handle storm water retention. In the main,there will be two tiers of lots with some lots arrayed around a proposed cul-de-sac terminus for a new extension of Day�ton Avenue NE into the plat. Running dotivn the��est side will be Tract A at the northwest corner follo�ved by Lots 1 to 8,with Lot 8 at the southwest corner. Proposed Lots 10 and 1 1 �vill be located along the south side of the cul-de-sac. Proposed Lots 12 to 20 will run up the east side. I, 12. The applicant proposes dedicating a 42-foot right-of-way for an extension of Dayton into the plat where ' it��vili end in a cul-de-sac. As noted above,the northern leg of Dayton corresponds�vith the subject site's eastern property line. Developing Dayton in the plat to align �vith the existing road��ould create awkward lots or lot accesses and substantially reduce the density as�vell as traversing the steeper slopes that need to be protected. Therefore, Dayton �vi11 be offset approximately 65 feet which staff indicated Eden's Garden Prelimina�y Plat File No.: LUAOI-007,PP,ECF April 26, 2001 Page 6 is not perfect but will be satisfactory. To provide a safe offset it will curve and re-curve slightly creating an alignment slightly west at its cul-de-sac. 13. 'I�he proposed lots will range in size from 4,525 square feet to 7,451 square feet. Many of the lots wi11 be in the 5,200-5,400 square feet range. 14. The density of the project after subtracting the road right-of-way and the protected slopes will be 7.17 dwetling �nits per acre_ I5. The subject site is more gently sloped along its northern section and then has steeper slopes near the center of its eastern margins. In the areas of Proposed Lots 13 through 17 there are slopes of 40%. On portions of Lots 14 and I S those slopes meet the criteria for protected slopes since there is a vertical rise of l 8 feet. On the other lots with steep slopes,the vertical rise is less than 15 feet. 16. The applicant has agreed to place the protected slopes in a Native Growth Protection Area. The ERC required the provision of a nine(9)foot buffer in which no construction or disturbance occurs. Native plants would be planted there. I 17. Staff noted that with the exception of two trees along the westem edge of the property,most of the � vegetation will be removed to allow the development of the new street and building pads. 18. The development of the street and building pads will require a substantial amount of on-site grading. I, The applicant estimates that approximately 6,500 cubic yards earthwork will be required. The estimate also indicates that this will be done with on-site materials aiid that rio importing or exporting of fill will be required. 19. The development will also require a number of retaining rockeries or walls. These structures would be between four and eight(4-8)feet tall with the ERC requiring taller walls to be engineered. These structures will be located on or adjacent to Proposed lots 1 through 7, 11, 12 and 13. 20. Neighbors who have lived in the area for a long time report that the site was used for dumping. The report indicate that dumped materials consisted of things such as concrete debris and drained automotive oils. The Geotechnical Report did not explore all areas of the site but did find some fill materials. 2'.. Develaprnent of 20 single family homes will generate approximately i92 traffic trips(based on approxi�nately 9.57 trips per dwelling). It is anticipated that approximately ]0% of the traffic trips�vill occur at each of the morning and evening peak hours. The ERC imposed mitigations measures for fee generation. 22. The development of the subject site will generate approximately 9 school age children. These students will attend scl�ools in the Renton School District. These students would be spread among the different grades. 23. Tract A �vill contain the detention system. There have been drainage problems in the area and storm «-ater from surrounding properties apparently flow to an pool on the subject site in the vicinity of Tract A. The subject site is also located in Aquifer Protection Zone 2. Infiltration will be provided to recharge the underlying aquifer. The applicant will have to comply with the 1998 King County Surface Water Design Manual. � Eden's Garden Preliminary Plat File No.: LUA01-007,PP,ECF Apri126,2001 Page 7 24. The City will provide sanitary sewer service and domestic water service. The site is subject to two Special Assessment District fees. CONCLUSIONS: 1. The proposed plat appears to serve the public use and interest. The applicant will be protecting the steep slopes with a Native Growth Protection Easement and provide a setback buffer to avoid intruding into the steep slopes. 2. The plat will provide additional housing in an area in which urban services are available. The applicant will be providing appropriate storm water storage and infiltration since the subject site is located in an aquifer protection area. The ERC imposed conditions to avoid exacerbating drainage problems down stream. Storm water will be contained and diverted to avoid excessive flows. 3. The revelation that dumping may have occurred on the subject site will require additional vigilance in order to determine if such dumping did occur and what types of materials,other than possible concrete debris or old soils,were dumped. Since the site is located in an aquifer protection zone,the applicant will have to do additional studies of the site and its soils before disturbing too much of the surface layers. 4. The substantial grading will require the clearing of most of the subject site. The applicant will be preserving only two trees if possible. The ERC imposed conditions to deal with grading and the construction of retaining walls. ' 5. The density of 7.17 falls within the range of 5 to 8 required by both the Zoning Code and Comprehensive Plan. 6. `fhe proposed plat will increase traffic and noise into this area. Staff has indicated that the traffic is acceptable on tlie nearby roads. In addition,the applicant will be paying a fee to offset its transportation impacts. 7. The plat should contain language acceptable to the City Attorney regarding the fact that Tract A is for storm �vater detention and development is precluded. 8. In conc!us:on,the �roposed preliminary plat should be approved by the City Council subject to the conditions noted below. RECOMMENDATION: The Preliminary Plat should be approved subject to the following conditions: 1. The applicant shall comply with the conditions imposed by the ERC. 2. The plat should contain language acceptable to tl�e City Attomey regarding the fact that Tract A is for stonn vvater detention and development is precluded. 3. The applicant sliall have the subject site surveyed by a licensed firm with expertise in hazardous substances. The review shall be subject to review and approval of the City and the results shall be submitted to the City. The review shall indicate whether there are hazardous materials on the subject Eden's Garden Prelimiz�u�y Plat � File No.: LUA01-007,PP,ECF April 26,2001 Page 8 site or if the subject site is free of such contamination. If substances are found the report shall be submitted to the City and it shall contain information on the nature of such substances and how best to remove them and restore the subject site to a clean state suitable for the development of single family residential uses. The survey team shall be informed that a drinking water aquifer recharge area underlies the subject site in order that proper precautions are taken. 4. The plat shall contain language acceptab(e to the City notifying residents that the subject site is located in Aquifer Protection Zone 2 and precautions necessary to protect it. 5. A homeowners' association or maintenance agreement shall be created concurrently with the recording of the final plat in order to establish maintenance responsibilities for shared private utility improvements. The satisfaction of this requirement shall be subject to the review and approval of the Development Services Division prior to the recording of the fina) plat. ORDERED THIS 26`h day of April,2001. �4 � �.,, FRED J. KA AN HEARING E MINER TRANSMITTED THIS 26'h day of April, 2001 to the part:es of record: Lesley Nishihira Larissa King Raymond Pinz ]O55 S Grady Way Barghausen Consulting Engineers 2000 Dayton Avenue NE Renton, WA 98055 18215 72nd Avenue South Renton, WA 98056 Kent, WA 98032 Kayren Kittrick Hal Grubb Larry Samples 1055 S Grady Way Barghausen Consulting Engineers 1824 Camas Avenue NE Renton, WA 98055 18215 72"d Avenue South Renton, WA 98056 Kent, �VA 98032 TRANSMI"ITED THIS 26`h day of April, `?001 to the follo�ving: Mayor Jesse Tanner Gregg Zimmerman, Plan/Bldg/PW Admin. Members, Renton Planning Commission Neil Watts,Development Services Director Larry Rude, Fire Marshal Sue Carlson, Econ. Dev. Administrator Lawrence J. Warren,City Attorney Larry Meckling, Building Official Transportation Systems Division Jay Covington,Chief Administrative Officer Utilities System Division Councilperson Kathy Keolker-Wheeler South County Journal Betty Nokes,Economic Development Director Pursuant to Title IV, Chapter 8, Section 100Gofthe City's Code, request for reconsideration must be filed in writin�on or before 5:00 p.m.,May 10,2001. Any aggrieved person feeling that the decision of tlie Examiner is ambiguous or based on erroneous procedure,errors of la�v or fact,error in judgment,or the discovery of new evidence �vhich could not be reasonably available at the prior hearing may make a written request for a review Eden's Garden Preliminary Plut I FileNo.: LU:�U1-UO?,Pl',ECF �, April 26, 20U 1 I Page 9 ' by the Examiner within fourteen (14)days from the date of the Examiner's decision. This request shall ser t;,r�!, the specific ambiguities or errors discovered hv such appeliant, and the EYaminer mav. after revie�v of th� record,take further action as he deems proF� An appeal to the City Council is governed t ' � � � ; ;. � : ;:.._ . ..�i: � : . :, I' be filed with the City Clerk, accompanying a tiling fee'of$75.00 and meeting other specified requirements. I� Copies ofthis ordinance are available for inspection or purchase in the Finance Department, frst fl��r of Citti I Hall. An appeal must be filed in writin�on or before 5:00 p.m.,May 10,2001. If the Examiner's Recommendation or Decision contains the requirement for Itr�tricti�e C'��n:�nt�, the executed Covenants will be required prior to approval by City('� �s�� '� , , r may contact this office for information on formatting covenants !, The Appearance of Fairness Doctrine provides that no ex parte(priti��i� unc-u,�-�ne� c��u�nunicat»ns may occi;:. �� concerning pending land use decisions. This means that parties to a (and use decision may not communicate i� private with any decision-maker concerning the proposal '' � � -' ' ' ' ' ' the Hearing Examiner and members of the City Council. All communications concerning the proposal must be ma�e in public. i lus public cuiumunicat�on perm�ts a interested parties to know the contents of the communication and would allow them to openly rebut the evidence. Any violation of this doctrine would result in the invalidation of the request by the Court. 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SUMMARY AND PURPOSE OF REQUEST: Public Hearing Date: April 10,2�01 Project Name: Eden's Garden Preliminary Piat Applicant/ Jack Willing , Address Lyle Homes , 1601 114�'Street SE, Suite#100 Bellewe,WA 98002 Contact/ Larissa King Barghausen Consulting Engineers Address �g2�5 72nd Avenue South Kent,WA 98032 Owner/ Charles&Wilma Eaton Keith &Janet Lankester Address: 2401 NE 20`h Sfreet 12215 SE 88`" Place Renton,WA 98056 New Castle, WA 98056 File Number. LUA-01-007, PP, ECF ProjectManager. Lesley Nishihira Project Description: The applicant proposes to subdivide a 3.41-acre parcel into 20 lots intended for the eventual development of detached single family residences. The proposed lot sizes range from 4,525 square feet to approximately 7,451 square feet. The net density of the proposal is 7.17 dwelling units per acre: Access to the site is proposed from a residential street off of NE 20'�StreeL Project Location: South"side of NE 20�'Street; between Dayton Avenue NE & Camas Avenue NE � - . . . : :�..' .�':;`'•..�;�, � �' � � "!�! .,! ,� . J 4� i�i i ,� �� . � ( � .� � �. r �. =m - - � ��m +p�ay ic iB A � �. ! �� • ! • ,� + � - • �. 4' •�� / ��:•� j .� /��.�,� � � �, d r� � j1�• J ' o _ j� '/ ! '�' ,T1� yT ,�. �� `a' '�6� ��k �.3: 4 .i` ,� '--�"�r"f I' � � � .. rW j• 9' =e i.•j .>• _ � e.- o��ei w�a e f c �p,• <�<' ; � .� 4 - •� 'r�. -i• c ss _ J• - . '�. 6,d� �� '� . �#="i� '.1}S I� � \ .. '_4t ., t' -'�' .,iTt' . � 7�� /rjl j�_/� ` . }., .� _ .�.r ti+� '- ,_� �,-= 6 .�� - ;. - ,':�, --•-�--- �-L � ;, _ , �; ' `-�� - 'f ;� '- � , %1%L.h - �,; . _ , 'r ' ' ' /� �-r ' = , �+ J•�� i -�'� f•� �� t�y� r ^�. �'��- ��`� � � � �M� � � � ��.;. ' � s�`_�, SITE _y „ '=- '`:-=�� -�; =--�--- � � ��_ '� ` � �� '.;�;. —�- � � _�f. � N i �.4,i, �' _ = ;-;::�- ' � _ 1� � �^� ,j� i.� - � � _ t•�.��+,: f, : �: � .:.'�`T '�� ys ' .-a , f �+ i ''i -� _ �� '� .?�--� _.` - _ - 1 _ . _ _. _''c -_ i �� -'- a'• f := � .. �`i - �T��`��'J, i :: - ,'.��-�;� �Y � � _±"� '.� �. . }�. = �� .1i1y�r._ i l ' �-`- � �. � - - .�_ �3�.''',�+• G _ ''F Y '�S�i„�'�� _/ ' .. ... • 9�Y � �.�5 �.�� _ �� ` '�'� � ; � _�._� � � -__ L t =y �: "�" —� � +�.f` .Ct. ��'�: - �_}I s - ' ? � a'�!. •v _ i — _ � ��'.�.:__� � .j� 1 /, .,,§,�t" ��'� .�4 �a�� _ . _ ��' 911 � r-�1 r . i=�1'� ��J� "�_31 -��"`�l \�-�\� & t..•� �. � �• _. ' l. �rT� . � at_ � •♦ �tCity ofi2enton P/6/Pt1�Department Preliminary Report to the Nearing Examiner � EDENSGARDENPREUMINARYPLAT LUA-Ot-007,PP,ECF PUBLIC NEARING DA7F: Apri!10,2001 Page 2 of 9 8. GENERAL lNFOR1VIATION: 1. Owner of Record: Charles &Wilma Eaton 2401 N E 20t''Street Renton,WA 98056 Keith &Janet Lankester 12215 SE 88�'Place New Castle,WA 98056 2. Zoning Designation: Residential—8 Dwelling Units per Acre(R-8) 3 Comprehensive Plan Residential Single Family(RSF) �and Use Designation: 4. Existing Site Use: The property is presently developed with a single family home and associated detached accessory structures. 5. Neighborhood Characterisfics: North: Single family residential; R-8 zoning East: Single family residential; R-8 zoning South: Single famity residential; R-8 zoning ' West: Single famity residential; R-8 zoning 6. Access: Proposed right-of-way off of NE 20t"Street 7. Sife Area: 3.41 acres(148,539.6 s� 8. Project Data: area commenfs Existing Building Area: 2,761 sf Existing residence and accessory structures New 8uilding Area: N/A N/A Total Building Area: N/A N/A C. HISTORICAL/BACKGROUND; Action Land Use File No. Ordinance No. Date Annexation N/A 1822 03/22/1960 Comprehensive Plan N/A 4498 02/20/1995 Zoning N!A 4404 06/07/1993 D, APPLICABLE SECTIONS OF THE RFNTON MUNlClPAL CODE: 1. Chapter 2 Land Use Districts Section 4-2-020: Purpose and Intent of Zoning Districts Section 4-2-070: Zoning Use Table SecGon 4-2-110: Residential Development Standards 2. Chapter 3 Environmental Regulations and Special Districts Secti�n 4-3-050: Critical Areas Reguiations 3. Chapter 4 Property Devefopment Standards Section 4-4-030: Development Guidelines and Regulations Section 4-4-060: Gradir►g, Excavation and Mining Regulations Section 4-4-080: Parking, Loading and Driveway Regutations -: t . hex i. City of Renton P/HiPW Department Preliminary Repo�t to the Nearing Examiner EDEN S GARDEN PRELJMINARY PLAT L UA-O t-007,PP,ECF PUBLIC HEARlNG DATE: Apn7 10,2001 Page 3 of 9 4. Chapter 6 Streets and Utility Standards Section 4-6-060: Street Standards 5. Chapter 7 Subdivision Regulations Section 4-7-050: General Outline of Subdivision, Short plat and Lot Line Adjustment Procedures Section 4-7-080: Detailed Pr�cedures for Subdivision Section 4-7-120: Compatibility with Existing Land Use and Plan-General Requirements and Minimum Standards Section 4-7-150: Streets—General Requirements and Minimum Standards Section 4-7-160: Residential Blocks—General Requirements and Minimum Standards Section 4-7-170: Residential Lots—General Requirements and Minimum Standards Section 4-7-220: Hillside Subdivisions 6. Chapter 9 Procedures and Review Criteria T. Chapter 11 Definitions E. APPLICABLE SECTIONS OF THE COMPREHENS/VE PL4N: 1. Land Use Element: Residentiat Single Family objectives and policies; Residential Streets objectives and policies;Subdivision of Land objectives and policies. 2. Housing Etement: Housing Supp{y objectives and policies; Minimum Density Policies. F. DEPARTMEIYT ANALYSIS: 1. PROJECT DESCRIPTION/BACKGROUND The applicant has proposed to subdivide a 3.41-acre site into 20 lots suitable for the development of detached single family residences. The site is currently developed with a single family residence, along with associated detached accessory structures, all of which are proposed to be demolished as part of the project. The property is currently vegetated with blackberry bushes, short scrub bushes and trees. The proposed lots would range from 4,525 square feet to approximately 7,451 square feet in size. The project includes the installation of utilities and the dedication of a 42-foot wide residential street extending from NE 20�' Street. The proposed right-of-way would terminate in a cul-de-sac after a length of approximately 420 feet. The project would inGude approximately 6,500 cubic yards of earthwork, and the removal of several trees. The subject site contains areas designated on the Cit�s Steep Slopes Critical Areas map with sensitive and protected slopes. The applicant requested a waiver of the third party review of the geotechnical report typically required for properties with such designations, which was granted on March 7,2001. 2. ENVIRONMENTAL REVIEW Pursuant to the City of Renton's Environmental Ordinance and SEPA (RCW 4321C� 1971 as amended), March 13, 2001, the Environmental Review Committee issued a Determination of Non-Sign�cance - Mitigated (DNS-M) for the Eden's Garden Preliminary Plat. The DNS-M included 10 mitigation measures. A 14-day appeal period commenced on March 19, 2001 and ended on April 2,2001. No appeals of the threshold determination were filed. - 3. COMPLIANCE WITH ERC MITIGATlON MEASURES Based on an anatysis of the probable impacts from the proposal, the Environmentat Review Committee issued the following mitigation measures with the Determination of Non-Sign�cance— Mitigated: hexrpt Gty of Renton PB/PW Department Preliminary Report to the Hearing Examiner ' EDEN'3 6ARDENPRELIMINARYPL4T LUA-Dl-0OT,PP,ECF PUBLIC HEARlNG DATE: April 10,2001 Page 4 of 9 1. T�e area containing profecfed slopes shall be noted on fhe face of the plat as a Native Growth Protection Area and recorded separately as a profective easement concurrently with the recording of the plaf. 2. The 9-foot building setback from the Nafive Growth Protection Area shal!be established as a buffer area fo be planted wiih appropriate nafive species atter the completion of all grading work. The safisfaction of this requirement shall be subject to fhe review and approva!of the Developmenf Services Division prior to the recording of fhe final plat_ 3 The foilowing note shall be placed on the civil drawings for the project: `A licensed engineer wifh geotechnical expertise must be retained for proposed rockeries greater than four feet in heighf. The engineer must monitor rockery construcfion and verify in wrifing fhat fhe rockery was construcfed in general accordance wifh Associated Rockery Contracfors (ARC) standards and with his/her supplemenfa!recommendations, in a professional manner and of competent and suifab/e maferial. Written verifrcation by the engineer must be provided to the City of Renfon public works inspector prior to approva! of an occupancy permit or plat approval for the project A separate building permit will be required.' The safisfaction of this requirement sha!! be subject to the review and approval of the Development Services Division prior to the issuance of construcfion permits for plat improvements. 4. The applicant shall comply wifh the recommendations confained within the Geotechnica/ Study dafed May 3, 2000 prepared by ADaPT Engineering in regards fo site preparation, design, and construction of the project. 5. Temporary erasion contro/ measures shall be maintained to the satisfacfion of the represenfative of fhe Developmenf Services Division for the durafron of fhe projecYs construction. 6. Week/y reports on fhe sfafus and condition of the erasion control plan with any recommendations of change or revision to maintenance schedules or insfallafion sha11 be submitted by the project engineer of record fo fhe Pub/ic Works inspecfor. 7. CertifrcaSon of the proper remova!of fhe erosion control facrlities sha!/be required prior fo the recording of fhe frnal plat 8_ The applicant shaA pay fhe appropriate Fire Mifigatron Fee based on a rate of$488.00 per new single family lot prior to the recording of the final p/at. 9. The applicant shall pay fhe appropriate Tra�c Mitigation Fee based on$75.00 per each new average daily trip associated with the project prior fo the recording of the final plat ?0. The applicant shall pay fhe appropriafe Parks Mitigafion Fee based on $530.76 per new single family homs prior to fhe recording oi the fnal plat The appiicant is required and intends to comply with each of these mitigation measures prior to the recording of the final plat. 4. STAFF REVIEW COMMENTS Representatives from various city departments have reviewed the application materials to identify and address site plan issues from the proposed develapment. These comments are contained in the official file, and the essence of the comments has been incorporated into the appropriate i sections of this report and the Departmental Recommendation at the end of the report. I 5. CONSISTENCY WITH PRELIMINARY PLAT CRITERIA: Approval of a plat is based upon several factors. The following preliminary plat criteria have been established to assist decision makers in the review of the subdivision: (a) Compliance with the Comprehensive PJan Designation. The subject site is designated Residential Single Family (RSF) on the Comprehensive Plan Land Use Map. The objecfive established by the RSF designation is to protect and enhance single famity neighbofioods. The hewpt City of Renton P/B✓PW Depa�tment Pieliminary Report to the Hearing Examiner EDEIY'S GARDENPRELfMlNARYPLAT LUA-01-00T,PP,ECF PU8t1C HEARING DATE- April 10,2001 Page 5 of 9 proposal is consistent with the RSF designation in that it would provide for the future construction of single family homes and would promote goals of infill development. The proposed plat is consistent with the following RSF policy: Policy LU-34. Net development densities should fall within a range of 5 to 8 dwelling units per acre in Residentia! Single Family Neighborhoods. After the deduction of critical areas and roadways, the proposal for 20 units on the 3.41-acre site would result in a net density of 7.17 dwelling units per acre. (b) Compliance with the Underlying Zoning Designation. The 3.41-acre site is designated Residential — 8 Dwelling Units per Acre (R-8) on the City of Renton Zoning Map. The proposed development would allow for the future construction of up to 20 new dwelling units and associated plat improvements. Density— The allowed density range in the R-8 zone is a minimum of 5.0 to a maximum of 8.0 dwelling units per acre (du/ac) for lots exceeding 0.5-acre in size. Net density is calculated after critical areas and public rights-of-way are deducted from the gross acreage of the site. After the deduction of the roadway (25,264.8 square feet) and protected slope area (1,742.4 square feet) from the 148,539.6 gross square foot site(148,539.6 gross square feet—27,007.2 total deducted area = 121,532.4 net square feet / 2.79 net acre), the proposal would arrive at a net density of 7.17 dwelling units per acre(20 units/2.79 acre=7.17 du/ac),which is within the allowed density range of the zone. Lot Dimensions — The minimum lot size permitted in the R-8 zone is 4,500 square feet. A minimum lot width of 50 feet is required for interior lots and 60 feet for comer Iots. Lot depth is required to be a minimum of 65 feet. The proposed plat would create 20 lots ranging in size from 4,525 square feet to approximately 7,451 square feet. Lot widths range from 50 to 71 feet and depths of 79 to 114 feet are also provided. The proposal's compliance with the required lot dimensions and setbacks is discussed further under the analysis of compliance with the subdivision regulations. Buildinq Standards—The R-8 zone permits one single family residential structure per!o� Each of the proposed lots would support the construction of one detached unit. Accessory structures are permitted at a maximum number of two per lot at 720 square feet each, or one per lot at 1,000 square feet in size. Building height in the R-8 zone is limited to 2 stories and 30 feet for primary structures and 15 feet for detached accessory structures. Maximum building coverage is limited to 35% of the lot area or 2,500 square feet,whichever is greater, for lots over 5,000 square feet in size, and 50% for lots less than 5,000 square feet in size. The proposal's compliance with each of these building standards will be verified prior to the issuance of building permits for each individuat structure. Parkinq—Each detached dwelling unit is required to provide two off-street parking stalls per unit. Tandem parking is also permitted. The provision of two off-street parking spaces will be verified during the review of building permits. (c) Compliance with Subdivision Regulations. Lot ArrangemenL Side lot lines are to be at right angles to street lines, and each lot must have access to a public street or road. Access may be by private access easemenf street per the requirements of the Street Improvement Ordinance. The side lot lines of the proposed lots are at right angles to street lines. Each of the proposed lots would have direct frontage to a public roadway. All lots comply wilh arrangement and access requirements of the Subdivision Regulations. Lots: The size, shape and orientation of lots shall meet fhe minimum area and width requiremenfs of the applicable zoning classiFcation and shall be appropriate for the type of development and use contemplated. Each of the proposed lots satisfies the minimum lot area requirements of the R-8 zone. The proposed lots would range in size from 4,525 square feet to approximately 7,451 square feet. In hexrpt Gty of Renton PB✓PW Departmenf Preliminary Repori to the Hearing Examiner ' EDENS GARDENPREUMINARYPLAT ` LUA-Ol-007,PP,ECF PUBLJC HEARING DATE: Apri!10,2001 Page 6 of 9 addition, the proposed pipestem lots (lots 8 and 11) satisfy the minimum lot area requirement when excluding the pipestem portion of the lots. The proposed lots also comply with the R-8 requirements for minimum lot width and minimum lot depth. In addition, all pipestem lots must provide a minimum width of 20 feet—which lots 8 and 11 comply with. The plat plan includes setback fines for each lot showing potential buitding envelopes. The proposed envelopes indicate the appropriate building setbacks as required by the R-8 zone, including front and rear yard setbacks of 20 feet, interior side yard setbacks of 5 feet, and side yards along public or private street setbacks of 15 feet. In addition, lots 8 and 11 appear to provide the appropriate front yard setbacks when excluding the pipestem. When considering the required setbacks, as well as access points for each lot, the proposed lots appear to have sufficient building area for the development of suitable detached single family homes. Property Corners at lnfersections: A!l lot comers at intersecfions of dedicated public rights-of- way, except alleys,shall have minimum radius of?5 feef. The proposed subdivision would create one lot at the intersection of public rights-of-way (tot 20). The preliminary grading plans for the proposal appears to include the required corner radius. (d) Reasonab/eness of Proposed Boundaries Access and Street lmprovements: Access to the site is proposed via a residential street with a reduced right-of-way width of 42 feet. The proposed street would include 32 feet of pavement and 5-foot sidewalks on both sides. The proposed street extends 420 feet south of NE 20�' Street, ending a cul-de-sac. Full sVeet improvements, including curb, gutter, sidewalks, and street lighting would be constructed as part of the project. As proposed, access to the site would not align directly with Dayton Avenue NE. The newly created residen6al sUeet would create an offset intersection of approximately 65 feet. The offset alignment is necessary for the project in order to avoid the creation of a large portion of unusable property and to allow for the creation of appropriately sized lots within the density range required � in the R-8 zone. With the project application, the applicant provided transportation information and analysis in a report prepared by Gibson Traffic Consultants, dated January 5, 2001. Based on this repart,the proposed alignment would not result in a potential hazard to traffic. The limited traffic volumes � on the associated streets and the availabfe sight distances are not expected to result in any potential hazards to traffic. After review of the transportation analysis, spec�cally with regard to the proposed intersection atignment, staff concurs with the reporYs conGusions and recommendations. The initial set of plans submitted for the project depict a substandard cut-de-sac that did not meet minimum radius requirements. In addition. the proposed street included a reverse curve that did not comply with minimum separa6on requirements. As requested, the applicant revised , the proposed plat plans for stafPs review prior to the public hearing. The revisions provide the I required minimum 55 feet of cul-de-sac radius. as well as the necessary 100-foot separation i between the reverse curves of the roadway. The revised roadway resulted in minor modifications to lots dimensions and a slight increase in the area to be dedicated to right of-way. The updated plans appear to comply with code requirements and stafPs analysis of the revised ' plans has been included throughout the body of this report. The establishment of a homeowners association or maintenance agreement for the private driveways, as well as shared utilities. will be recommended as a condition of the short plat approval. The proposal would result in an increase in traffic trips to the Cit�s street system; therefore, a Tra�c Mitigation Fee has been imposed by the Environmental Review Committee as part of the SEPA Determination issued for the project(SEPA mitigation measure#9). The Traffic Mitigation Fee is based on $75.00 per additional generated trip per single famity home at a rate of 9.55 nexrpt City of Rertton P/B/PW Depariment Preliminary Report to the Hearrng Examiner EDEN'S GARDEN PREUMlNARY PLAT L UA-01-007,PP,ECF PUBLIC HF11RUVG DATE: Apri!f 0,2001 Page 7 of g trips per home. For the proposal, the Tra�c Mitigation Fee is estimated at $13,637.25 (19 new lots x 9.55 trips x $75 per trip =$13,637.25). The fee is payabie prior to the recording of the final plat. Topography: The subject site is generally flat and is characterized by a gently sloping northern po�tion that slopes down to the central portion of the property from the east sides. The property i vegetated with mostly blackberry bushes, short scrub bushes and trees — including deciduou° cottonwood, fir, maple, oak, evergreen, fruit and pine trees ranging in size from 6-inches to 2• inches in caliper. The site currently contains a single family residence along with sever,: abandoned outbuildings and scattered debris throughout the property. With the land use application, the applicant submitted a Geotechnical Report prepared b; ADaPT Engineering dated May 3, 2000. Soil conditions were evaluated by reviewing test pit� and log borings, which indicate soils at the site are underlain by very dense, moist, gray, silty gravelly sand interpreted to be glacial till. The central portion of the property appears to contai� man-placed fill materia(s underlain by the soils previously described. Approximately 1,606 square feet located on the eastem boundary of the site within proposed lots 14 and 15 contains a sloped area of 40%with a vertical rise of 18 feet—qualifying as a protected slope. North and south of this area, also along the eastem perimeter of the property (within{ots 13, 15, 16, and 17), are sloped areas of 40% with vertical rises of less than 15 feet, which are designated as sensitive slopes. According to the Geotechnical Report, no evidence of subsidence or slope instability was observed on fhe site,specifically in these areas. The applicant has indicated the protected slope area would be set aside within a Native Growth Protection Area (NGPA) as required by the Cit�s Critical Areas Regulations. As a SEPA mitigation measure, the applicant is required to note on the face of the plat that this area is a NGPA and must also record the NGPA separately as a protective easement concurrently with the recording of the plat (SEPA mitigation measure #1). Based on the submitted plans, the applicant intends to maintain a 9-foot building setback from the protected slope area. In order to ensure potential eros{on impacts associated with the protected slope area are mitigated, the applicant is also required to establish a 9-foot buffer area around the protected slope area. This area must be planted with appropriate native species after the completion of all grading work (SEPA mitigation measure#2). As proposed, all vegetation on the property would be removed with the exception of two trees located on the western perimeter of the site that are to be retained. Earthwork activities for the project are estimated at 6,500 cubic yards. Site preparation for the required improvements and building pads would utilize on-site materials and would not require the import or export of fill. New rockeries are proposed along the west and south sides of the proposed drainage tract, along the west sides of lots 1 through 7, along the east sides of lots 11, 12 and 13, as well as on the south side of the protected slope area within lot 13. The rockeries are proposed between heights of 2 feet to 8 feet, requiring building permits for those that exceed 4 feei in height. In order to ensure the rockeries are properly designed, the ERC required that the following n�te be inGuded on the civil plan:"A licensed engineer with geotechnicat expertise must be retained for proposed rockeries greater than four feet in height. The engineer must monitor rockery construction and verify in writing that the rockery was constructed in general accordance with Associated Rockery ConUactors (ARC) standards and with his/her supplemental recommendations, in a professional manner and of competent and suitable material. Written verification by the engineer must be provided to the City of Renton public works inspector prior to approval of an occupancy permit or plat approval for fhe project. A separate building permit will be required" (SEPA mitigation measure#3) The Geotechnical report concludes that the site is suitable for the proposed devetopment provided that the geotechnical recommendations included in the report are incorporated into the design and construction of the project. The City's Critical Areas Regulations require proposed developments containing sensitive and protected slopes to undergo third party review of the geotechnical report submitted with the application (RMC 4-3-050.J.3). The applicant requested a waiver of this review as permitted by the regulations, which was granted on March 7, 2001. The review of the Geotechnical Report indicated that the steep slope area and geological hewpt City of Renton P/8,/PW Deparfrnent Prefiminary Report to the Hearing Examiner ' EDEN'S GARDEN PRELIMINARY PLAT L UA-0'1-00T,PP,ECF PUBLJC HEARING DATE: April f0,2001 Page 8 of 9 hazards were adequately addressed and would be sufficiently mitigated by recommendations contained within the report. The recommendations include measures to be implemented during site and sub grade preparation, use of fill materials, cut and fill of slapes, building foundations, and site drainage— al! of which the applicant is required to comply with as imposed by the ERC (SEPA mitigation measure#4). Potential erosion impacts that could occur during project construcfian would be adequately mitigated by City Code requirements for approval of a Temporary Erosion and Sedimentation Control Plan (TESCP) pursuant to the King County Surface Water Design Manual (KCSWDM) and a Construction Mitigation Plan prior to issuance of Construction Permits. The applicanYs SEPA Checklist indicates the use of erosion contr�l measures, including silt fences, drainage ditches, and sedimentation control ponds during site construction. However, in order to ensure potential erosion impacts are adequately mitigated, temporary erosion control measures are required to be maintained to the satisfaction of the represenfative of the Development Services Division for the duration of fhe project(SEPA mitigation measure#5}. In addition, weekly repo�ts on the status and condition of the erosion control plan with any recommendations of change or revision to maintenance schedules or installation must be submitted by the project engineer of record to the Public Works inspector (SEPA mitigation measure #6). Certification of the installation, maintenance and proper removal of the erosion control facilities must be complefed prior to recording of the final plat(SEPA mitigation measure#7). Relationship to Existing Uses: The subject site is currently developed with an existing single family residence and three detached accessory structures. The surrounding properties include residential single family development—all zoned R-8—under development pattems similar to the proposed plat. The project is consistent with the intent of the both the Comprehensive Plan and Zoning Code and would not be out of character with the existing development in the area. (e) Availabilify and lmpact on Public Services(Timeliness) Police and Fire: Police and Fire Prevention staff indicate that sufficient resources exist to�umish services to the proposed development, subject to the condition that the appticant provide Code required improvements and fees. The Environmental Review Committee has imposed a Fire Mitigation Fee based an $488.00 per new single family residence in order to mitigate the proposal's potential impacts to emer�qency services (SEPA mitigation measure #8}. The fee is estimated at $9,272.00 (19 new lots x $488.00 = $9,272.00) and is payable prior to the recarding of the final plat . Recreafion: The proposal does not provide on-site recreation areas for future residents of the proposed plat. There are existing recreationat facilities in the area of the subject property (e.g., May Creek Park) and it is anticipated that the proposed devetopment would generate future residents that would utilize existing City park and recreational facilities and programs. Therefore, a Partcs Mitigation Fee based on $530.76 per each new single famity lot has been required by the ERC (SEPA mitigation measure#10). The fee is estimated at$10,084.44 (19 new Iots x$530.76 _$10,084.44)and is payable prior to the recording of the final ptat. Schools: The site is located within the boundaries of the Renton School District. Renton School District No. 403 has indicated that the increased student enrollment that may result from the development of the proposed project, estimated at 8.36 students, can be accommodated by Kennydale Elementary School, McKnight Middle School and Hazen High School. The schoo{ district has indicated that these schools would be able to support the additional students generated by the proposal. Storm water. Based on the City's Critical Areas Maps, the site lies within Aquifer Protection Area —Zone 2. The applicant has submitted a Drainage Report prepared by Barghausen Consulting Engineers, dated January 11, 2001 with the land use application. The report indicates that on- site surface water and surface water runoff from adjacent properties cuRenUy cotlects and infiltrates on-site in a large depression located in the northwestem comer of the site. Drainage problems have been known t�exist in the area of the subject site. The applicant investigated the use of the abutting property to the south (City owned)for use as an infiltration pond. However, due to field tests indicating porous soils at 10-foot depths, it was determined not to be feasible for use by the proposed plat. The project proposes to provide a hexrpt City of Renton P/81PW Department Preliminary Report to the Nearing Examiner EDEN S GARDEN PRELlMINARY PLAT L UA-01-007,PP,ECF PUBLIC NEAR/NG DATE: Apri!J0,2001 Page 9 of 9 drainage tract for an infiltration pond to accommodate current storm water runoff, which wouid be located in the northwest corner of the property. Storm water runoff from the proposed development would be collected in catch basins and conveyed in underground pipes to this infiltration pond. The facilities would be designed in accordance with the 1998 King County Surface Water Design Manual, including water quality treatment and infiltration at present rates to allow ground water recharge. According to the drainage report, site investigation saw no evidence of overtopping of the existing depression that would indicate there is a problem with infiltrating runoff from the upstream properties contributing to the site. However, prior to the issuance of construcGon permits for the installation of the storm water system, staff will verify the proposed drainage facility is appropriately designed to accommodate storm water runoff (e.g.. infiltration pond and/or detention vault}. Water and Sanitary Sewer Utilities: There is an existing 6-inch water line in NE 20'" Street and two 8-inch water mains stubbed to the southeast comer of the parcel. The proposal includes the instaltation of a new 8-inch waterline, which would connect to the existing line in NE 20�' and would loop through the site and connect to the existing waterlines stubbed to the southeast corner of the property. The installation of a fire hydrant is also proposed to ensure ali lots are within 300 feet of a hydrant as required by City code. Water System Development Charges. based on a rate of $1,105.00 per single family home will required prior to the issuance of construction permits for the subdivision. A redevelopment credit for the two existing water service connections has been given, for an estimated SDC fee of$19,890.00 ($1,145.00 x 18 new lots = $19,890.00). The project would install an &inch sanitary sewer line within the proposed roadway, which would connect to the existing 8-inch line in NE 20�' Street. The project will be required to extend sanitary sewer to all lots as shown on the preliminary drawings. Wastewater System Development Charges, based on $760.00 per single family site, witl be required prior to the issuance of construction permits for the subdivision. Redevelopment credit has also been given for one existing sewer connection. for an estimated SDC fee of $14,440.00 ($760.00 x 19 ne�. lots = $14,440.00). In addition, two Special Assessment District (SAD) fees are owed for th� subject property. Under the Jones Avenue NE SAD, approximately$6,878.00 plus interest is due and approximately $6,300.00 plus interest is due under the West Kennydale SAD. These fees must be paid prior to the issuance of construction permits for the project. G. RECOMMENDATION: Staff recommends approval of the Eden's Garden Preliminary Plat, Project File No. LUA-01-007, PP, ECF subject to the following condi6on: 1. A homeowner's association or maintenance agreement shall be created concurrently with the recording of the final plat in order to establish maintenance responsibilities for shared private utility improvements. The satisfaction of this requirement shall be subject to the review and approval of the Development Services D'nrision prior to the recording of the final plat. EXPIRATION PERIODS: Preliminary Plats (PP): Preliminary plat approval shall lapse unless a final plat based on the preliminary plat,or any phase thereof, is submiried within five(5)years from the date of preliminary plat approval. hexrpt , �.1dNARY M.AT �-�wl�— POR � EDENS GARDEN � r'S0� A roarari oF n�t�v�oF n�eE u�a�eec.�a,rowrier�2s r�,u�s�w�. � � E�;��'� FIENTCN,WABFtlVOTON �g � r- � �w,oa�ar,mM .-� ani mt.w t.i r. Il�y � � � � qn->-rr Mu qN�c ,11 1 � � MIltRO tRR kp[ OA�A�. Q M lill MG f.l�,w. �� ruw<a.cwe wn n wn � � V1C�TY MA� � � V rurr..awi aa�rt. �w/r � � n „ n aa rr Inr.) � I �Q� �� .w�ca w�m r.u w/. ' . �r ��r �. u h�+w�«ee.u.r.ew� 5 d � 4 Wrrr�tyU w�pl__ � � -_` f. Yn4 M MM AIt r [ .........�� , .i y...r:•� .� f...... � `f ,......�.;�..... ....,.. . ..... LOT AREA TABLP _.. •r........ _ .,..� . � .•�•��7M$T. i Kr rrt w�L�ti w�� uult�.� w� .rt�s.r � ......:_....�.��.�,--.. 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N I � z�t n� � H£zz � - sa CITY OF RENTON � DETERMINATION OF NON-SIGNIFICANCE (MITIGATED) MITIGATfON MEASURES APPUCATION NO(S): LUA-01-007,PP,ECF APPLiCANT: Jack Willing of Lyie Homes PROJECT NAME: Eden's Gardens Preliminary Plat DESCRIPTION OF PROPOSAL: The applicant is requesting Environmental (SEPA) Review and Preliminary Plat Approval for the 20-lot subdivision of a 3.41-acre site. The residential plat would create lots intended for the construction of detached single family homes —ranging in size from 4,599 square feet to 8,627 square feet. �he project inctudes the installation of utilities and the dedication of a 42-foot wide residential street extending from NE 20 Street. The proposed right-of-way would terminate in a cul-de-sac after a length of approximately 420 feet. The project would include . approximately fi,500 cubic yards of earthwork, and the removal of several trees. The subject sife contains areas designated on the City's Steep Slopes Critical Areas map with sensitive and protected slopes. The applicant has requested 2 waiver of the third party review of the geotechnical report typically required for properties with such designations. The waiver was approved on March 7,2001. LOCATION OF PROPOSAL: South side of NE 20`"Street;between Dayton Avenue NE&Camas Avenue NE � �_�z-.:��j�:.��.�:-,;�� _ MITIGATION MEASURES: �;`'` �- ��'-`=t,,, �.� �;` • �: � �� 1. The area containing protected s�opes�shall�b��,noteci-o�_t�e f�ace f_�t� plat as a Native Growth Protection Area and recorded separately as a p�i��ctive�a�ement concuR�ntJy��nri�tf�e�cording of the plat. �_ The 9-foot buildin setback f '� �the, a�ive Growth Protectiori` � be establ'�shed as a buffer area to be planted with appropriate natrrve�pec�es after�� 'on�Il g ing work. The satisfaction of this requirement shatl be subje�t to the=`revie��a��p�,�c3ir��f th�Devel ent Services Division prior to the recordin of the final lat. ; - � � - '�- �� " 9 P � �� i - r. :'� � .'iF'-, )!��.��y�tAY-.;t}- t r 3. The following note shall be ac�ii o{� the��_: ' � the proje� f�1'icensed engineer with geotechnical expertise must be retaineii�ir pr�pd�sed<� gr ,,t. � than fo�r feet ' height The engineer must monitor rockery construc6on and verify in wrii�g{,��'� ocke - con�u cted generaf accordance with Associated Rockery Contractors (ARC)s��nda��,��"w� �is/tier su `j�em �tarr co 'mendations, in a professional manner and of competent and suitab�. rriater�a 1�Written verification��t�en eer must be provided to the City of Renton public works inspectorh rio�'�b-:��p�oval of an oc�:i cyc,tpe,�i�t or plat approval for.the projecL A separate building permit will be r�q dire�_',,,�ae's�Gsfactiofi o��thi r ' •r�ement shall be subject to the review and approvat of the Devetopment Se�yice� :D'nri��gn; pri� tc�,th� ' uance of construction permits for plat improvements. '`�:,,�" ;�.� s_ ,�� y�,� �� , . �� 4. The applicant shall comply with ihe recomm�,�,o.j�c:or►t�uied within the Geotechnicai Study dated May 3, 2000 prepared by ADaPT Engineering in regards to site preparation.design, and construction of the projec� 5. Temporary erosion control measures shalf be maintained to the satisfaction of the representative af the Development Services Division for the duration of the projecYs construction. 6. Weekly reports on the status and condition of the erosion control plan with any recommendations of change or revision to mamtenance schedules w installation shall be submitted by the project engineer of record to the Public Works inspector. 7. Certification of the proper removal of the erosion control faciliGes shal! be required prior to the recording �f th�� final plat. 8. The applicant shall pay the appropriate Fire Mitigation Fee based on a rate of$488.00 per new single famity �� prior to the recording of the final plat. 9. The applicant shall pay the appropriate Traff►c Mitigation Fee based on $75.00 per each new average daity tr� associated with the project prior to the recording of the final ptat. 10. The applicant shall pay the appropriate Parks Mitigation Fee based on $530.76 per new single family home prior to the recording of the final plat. MITMEASURES CITY OF RENTON �' DETERMINATtON OF NON-SIGNIFlCANCE (MITIGATED} ADVISORY NOTES � APPLICATION NO(S): LUA-01-007,PP,ECF APPLICANT: Jack Willing of Lyle Homes PROJECT NAME: Eden's Gardens Preliminary Plat DESCRIPTION OF PROPOSAL: The applicant is requesting Environmentai (SEPA) Review and Preliminary Plat Approvat for the 20-lot subdivision of a 3.41-acre site. The residentia! plat would create lots intended for the construction of detached single family homes— ranging in size from 4,599 square feet to 8,627 square feet. �he project includes the installation of utilities and the dedication of a 42-foot wide residential street extending from NE 20 Street. The proposed right-of-way would terminate in a cul-de-sac after a length of approximately 420 fee� The project would include approximately 6,500 cubic yards of earthwork, and the removal of several trees. The subject site contains areas designated on the Cit�s Steep Slopes Critical Areas map with .sensitive and protected slopes. The applicant has requested a waiver of the third party review of the geotechnical report typically required for properties with such designations. The waiver was approved on March 7, 2001. LOCATION OF PROPOSAL: South side of N_ �Q�' . eet;between Da on Avenue NE&Camas Avenue NE Advisory Notes to Applicant: �� Y��_ � '� �"��:.. ::''� Z�' �' �L„. 'ii YP.� Y...: �. .'_ Q +�'�+. i ;� ' " '. n�4 The followinq notes are supplem'�ntal l�forinafion provid�iol;In ^�c,,on�nct�on with the environmental determination. Because these no��s:are p�ovided as informatioi);bl�,.`th�y are not subject to the appeal� �ocess for environmenta!determir�atia��: "` �'s"-�'�>�>�<: '' �: ��,-�:;- . �:.:_ . � • - : =�_ '`�`~'� "'�: Plannin4 � _ y'��; `..�:'��,.� ci: :� � r� � �;.. t a`:3 � � - �#,y`' _ 't3'�` �°�,��'�y�'k�'"�` �+ � 1. Rursuant to RMC 4-3-050.G, aIF;Native�rov��=:.r° ti� ea boun�iaries s- !I be marked with barriers easily � visble in the field during the de�elopm , � o�� ..�ect �;�S hall �lso be �r nanen t l y identified with signage approved by the Development Se�i rices C?ivi�ion. �?� :a -� � �- �. t i;:4.�. i��' r� 2. RMC section 4-4-030.C.2 limits hau?::��►�s b #vVeen 8:30 am ta3:34� m �M �day through Friday unless othervvise approved by the Development Servic�,Dn,� ��Uevef�p�n,nt S�rvi s Division reserves the right to rescind �i. the approved extended haul hours at an}�;,�im�e��r. aint�a�r�" ; �� 3. Necessary revisans (e.g..reverse curve for ro�y�.��r�,�c��-d�sac r�us, pipestem lots building setbacks) to the preliminary ptat plans must be completed and suBFrl'�ed to the projecf manager a m�imum of 2 weeks prior to the schedu(ed public hearing. 4. All debris and demolition materials must be removed from tFie site and properly disposed of in an approved off-site location. If underground tanks or hazardous materials are encountered during site preparation, the applicant must contact the City to discuss appropriate soils testing and disposal measures (e.g., Fire Deparbnent tank removat permits and verification soits are not contaminated). - 5. Asbestos abatement may be necessary prior to the removal of the dilapidated structures present on the site. Certification from Puget Sound Air Quality Authority may be reguired prior to the issuance of demolition permits for the project. Fire 1. A fire hydrant with 1,000 GPM fire flow is required within 300 feet of all new sirigle family structures. If the building � square footage exceeds 3,600 square feet in area, the minimum fire flow increases to 1,500 GPM and requires two hydrants within 300 feet of the structures. �. The street cut-de-sac. as shown, does not meet minimum requirements. The 90-foot diameter is the drrving surface inside curbs. Sidewalks would have to be installed outside of ihe required 90-foot diameter. Adv�soryNotes , t ' Eden's Gardens Preliminary Plat 'A-01-007,PP,ECF �isory Notes (continued) age2of3 ' Plan Review—Surface Water � 1. There are no System Development Charges owed for this projec�Appticant has proposed to treat and infiltrate aN surface water onsite within the development. 2. Applicant has submitted a drainage report for review.Applicanf proposes 100qo infiltration of entire site.The report is currently under review. The applicant may be required to redesign the stormwater faci[ity to appropriatety accommodate runoff from the site(e.g.,detention vautt). 3. Applicant shatl submit separate structural plans for review and approval under a buflding permit for proposed vault I Special inspection from the building department is required. Please add note on civil plans. 'i 4. Existing septic system shall be abandoned in accordance with King County Health prior to recording of the pla�. II, Plan Review=Water '� 1. The System Deve{opment Charge fo�water shall be$19,890.00.(The rate is$1,105 x 18)A redeveiopment credit I� was given for two existing water service connec'��Fti�feeis;�ayable with the construction permit. � �a%�' ..� -.�a: : �.,�, �I 2. Fire flow requirement for singte-famity re�ideti�,*es rs�` �00 gpm. -E�. �. ion of a water main and looping of the ! system is required on site: The utilityyp'i�a� subr�tted�p�ears tc��iav � dressed this. A new hydrant is shovm , within the developmen� �- '�.,,� �-._'"'"' y� �, r � .V�.,y �. � }C�. an Review—Sanitarv Sewer ' � -_-�'�' � . 1.` � . . yH }. �. : • ; s �� ,s� , � y �. The System Development Charg�e for sewer s�b�- 1��,,,40.0�(The�rate is��60 x 19)A redevelopment credit I was given for one existing sewer:�ont�ecti�n.��i' - �a}�� "th th�co�s bon permit .ti .-� .. . �vr:`-';•. �-t� �,y`,�;?'�;' � Y 2. Two Special Assessments are o�ed on this '*� ' p atety$6,�78 plu�nterest is owed under.the Jo►�es Ave NE SAD and approximately'�.$6,300�plu .,�n r f is o unde�the We�st Kennydate SAD. This fees are payable with the construction perr�i�� _� �• ��:' ` ` ` -` - `� .. :�s' , '. r �. �, . ,� ,�. _- �� 3. Dual side sewers are not allowed. Nlipirr�eir'��o�,�hall be 2%j__- �Y`��'-y' ..ti}�.._ _�` �..� . ;.y. <... '� F . 4. Extension of a sewer main is required oa'i�.sjte..,Appl'�t TT�a��ow�e� ension on the plan. . ""' �: .�.v� , � . ,;:� _: ,- Plan Review—Transao�tation �z�:F.,�,,,�.t.<<,;�;,�"�='j ,1. Sidewalk, curb and gutter, storm and street lighting wiU be required fronting the property along NE 20"'Street and within the developmen� Street lighting plans are required. 2. Cul-de-sacs shall have a minimum aaved radius of 45 feet and a right of way radius of 55 feet.Applicant shows 40 - feet of paved radius. Plans must be revised to meet City Code. 3. Street signs are requi�ed and shall be installed as part of this project. 4. Applicant proposes 42 feet of right-of way with 16 feet of pavement and 5-foot sidewalks within the development Utility easements will be required for atl franchise u6lities to be instalied outside the right-of-way. Plan Review—General � 1. A construction ptan indicating hau!route and hours,construction hours and a traffic contral plan shaU be submitted for approval pr'�or to any permit being issued. Haul hours shatl be restricted to 8:30 a.m. to 3:30 p.m. unless ' approved in advance by the Development Services Division. 2. A separate utility permit to cut and cap existing utiliGes to existing structures on site will be required as part of the demolition permit. Eden's Gardens Preliminary Plat LUA 01-007,PP,ECF '�visory Notes (continued} jge3of3 3. All plans shall conforrn to the Renton Drafting Standards 4. All required utility, drainage and street improvements will require separate plan submittals prepared aceording to City of Renton drafting standards by a licensed Civil Engineer. 5. A traffic study has been submitted.There are no substantial conflicts with alignment of proposed street locafion. 6. Separate permits for side sewers,water meters and backflow device are reGuired.When plans are complete three copies of the drawings, two copies of the drainage report, a construction estimate and application fee shaq be submitted at the si� floor counter. A fee worksheet is attached for your use, but prior to preparing a check it is recommended to call 425-430-7266 for a fee estimate as generated by the permit system. Buildinq 1. The applicant must obtain demolition permits for the existing structures prior to the recording of the plat. � Propertv Services ,�:�:� 2. The reference to the lot line adjustment at tt�. �� _th leg'a�de criptions for Parcels A and B (sheet 1 of 4) is incorrect (#LLH-010-79). The correct re.�e�c��is��A-010-79.�s should be corrected prior to the public hearing for the project. x� � _.�,. �,. �' �� _.��.,,..,,..e,,,,,, � ' �e 3. Comments regarding corrections n�essa�f�he fina! plat sGtimi�l �I � forwarded under separate cover. } ' . i r` - �;t,� � .. . :s _ • '' "'i2;��=;� � `s•� � ��, .; . -�it'' ��;��-'—, �� - ^� 3� n r .:,� N �. .� , -? ';t�; � .f:'.yc,.,.. ��1��'�.�j 3, �•�J• � � i r; a;��*� . � � _ :��=.', ��: �.Kx� � �s � �4 ?S-:.izti�,� '.i�i t : 1� ' �R t � :��. � ,�. - .i . f� � �� s_.�_� "�--� � _ ,,�4�•�;. `��y�-...... . �...�`��.�'_ . �pj�`j � �,�� L `�� ...g:i:: . �'1",�}h�S..Xy!'.x;^>',�+ AdvisoryNotes 3.1 Downstream Drainage Analysis DOWAISTREAM A�IALYSIS Proposed Edens Garden 2400 Block of N.E. 20th Street Renton, Washington Prepared for: Lyle Homes 1601 - 114th Avenue S.E., Suite 100 Bellevue, Washington 98004 January 11 , 2001 Our Job No. 7535 ¢.GHA�� Civil Engineering, Land Planning, Surveying, Environmental Services �Q� ��`� �� 18215 72nd Avenue South, Kent, WA 98032 . (425) 251-6222 . (425) 251-8782 fax www.barghausen.com n ; _O a•1..<�.' y`�� ff�� y <��'c�GtNf`wQ` TABLE OF CONTENTS 1.0 PROJECT OVERVIE�'V 2.0 UPSTREAM DRAINAGE ANALYSIS 3.0 DOWNSTREAM DRAINAGE ANALYSIS AND PROBLEM SCREENING 4.0 RESOURCE REVIEW 5.0 CONCLUSION EXHIBITS EXHIBTT..A>, VICIlVITY M�P E�HIBIT"B" UPSTREA�1 BASI�1 �t,1P EXHIBTT"C„ SOIIS 1��1�P EXHIBTT"D" SOII.S REPORT �:. � �t- . �; . �;. --i � � � W � � � W � O N � � O � a 0 � 1.0 PROJECT OVERVIEW The proposed Edens Garden subdivision is a plat of approximately 3.4 acres with 201ots and associated street improvements to N.E. 20th Street and the street within the plat. The project is located within the Southeast quarter of Section 5,Township 23 North,Range 5 East,Willamette Meridian,City of Renton, ' King County,Washington,more particularly described as located in the 2400 Block, on the south side of N.E.20th Street between Camas Avenue N.E.and Edmonds Avenue N.E. See Exhibit"A"-Vicinity Map, which depicts the approximate location of the proposed site. The existing topography of the site has slopes ranging from 1 to 40 percent. At this time, an existing house with associated garage and outbuildings is located in the northeast corner of the site. There are no wetlands located on site; however,it is covered with dense trees and brush. The site topography is such that it slopes for the most part in a noRhwesterly direction to a closed depression located in the northwest comer of the site. - 1 - 7535.006[JPJ/jss] 2.0 UPSTREA�I DRAINAGE AN�LYSIS �.. ,� �; � �FS., � � �= - - ��n ,: ',� � - T: 2.0 UPSTREAM DRAINAGE ANALYSIS '' Based on a 1"=100'topographic map provided by the City of Renton and our site visit, it appears that �I there is upstream flow onto the site. Approximately 15.2 acres, counting the site,contributes runoff to , a large depression located in the northwest corner of the site. The area surrounding the site is fully �, developed, for the most part, with single-family detached residences. Portions of the upstream basin already have infiltration facilities provided for those areas;however,to be conservative,we have assumed that some of these areas contribute runoff into the closed depression located on site. Should the closed depression,which will be modified into an infiltration facility,ever fail,runoff will tend to sheetflow in a southwesterly direction off the southwestern property line of the site, and then flow through a channelized area through existing subdivisions into a street collection system downstream from the site. In conversations with the City of Renton,we are not aware of any overtopping of the closed depression to have ever occurred. Please the attached Exhibit "B" - Upstream Basin Map for delineation of the upstream basin contributing to the site. - 2- 7535.006(JPJ/jss] 3.0 DOWNSTREAM DRAINAGE ANALYSIS AND PROBLEM SCREENING � 3.0 DOWi�iSTREAi4i DRAINAGE ANALYSIS AND PROBLEM SCREENING I Since there is no downs�eam drainage course from the site for runoff contributing to the site,and from ' runoff generated on site, there is no downstream drainage analysis required. However, a field reconnaissance was performed in order to determine the size of upstream basin contributing to the site. Based on the site visit, there is no evidence of overtopping of the closed depression on site that would indicate there is a problem within infiltrating runoff from the upstream properties contributing to the site. - 3 - 7535.006[JPJ/jss] � W � � � W U � � O � � 0 � 4.0 RESOURCE REVIEW The United State Depar[ment of Agricultural Soil Conservation Service Map is provided with this downstream analysis. Also, Exhibit "D" - Soils Report prepared by AdaPT Engineering, Inc., was reviewed and incorporated within this report. Please review this document for the infiltration rates computed for the areas on site. -4 - 7535.006[JPJ/jss] � � � � 1�+ r�� .I � � � � � I � i r 5.0 CONCLUSION Since this site already exists as a closed depression in the northwest corner of the site,modifying the site to include the developed site and the upstream basin,which is fully developed,into an infiltration facility located where the closed depression is located,based on the KCRTS methodology and the infiltration rates computed by the soils consultant utilized for this project, this project concludes that there is no problem developing the site as planned. 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':L " .i aM� � i � f .�{��• Y� �tJ�.l.wr �r� .°'�� '�, r �kd;,� \ N O n °:�' m � 9� �: �k f �� ✓C� °,� t C1t.J� � �� "��¢" H r a K�Pa,dx a � �.+"'�z ��f,_`'�� . ._ � �" � ' '�i �.\II\'-..�. � �' 4 .' �t yy.' }I � i�Y k . �;i � r ,�';cµ �J �` {�� ,�,�i. ..''� v+r bt�s,��#�..� . . ,��y�,�y,9 �� .�� ti.1)��;,_ -,,, � e�.p.� �'� � �� ;f; , ., ..�� .. iA ..�� 2'�r dr p �Y�� .�, I L 1 i e � 1 �� I..{ J ' r 1/ , � �� . .I� I� � �. t t . .; ... � . A . 7 p ,,;�, , ,. a . . ,= s �4f , .�.: .r �= ��1�f� .1�.��. � . . . , � . �� -e , >a,.�r1`,"jn tili �x. , � , � .;..., ; , ,,'...:�... . �r�,.f� �nr GUIDE TO MAPPING UNITS For a full description of a mapping tmit, read both the description of the mapping im it and that of the soil series to which the mapping �mit belongs. See table 6, page 70, for descriptions of woodland groups. Other information is given in tables as follows: Acreage and extent, table 1, page 9. Town and country planning, table 4, page 57. Engineering uses of the soils, tables 2 and 3, Recreational uses, table 5, page 64. pages 36 thrwgh 55. Estimated yields, table 7, page 79. Woodland Described Capability timit group Map on syabol Mapping unit page Symbol Page Symb ol AgB Aldeiwood gravelly sandy loam, 0 to 6 percent slopes---------- 10 Ne-2 76 3d2 AgC Aldeiwood gravelly sandy loam, 6 to 25 percent slopes--------- 8 IVe-2 76 3d1 AgD Aldeiwood gravelly sandy loam, 15 to 30 percent slopes-------- 10 VIe-2 78 3d1 AkF Aldeiwood and Kitsap soils, very steep------------------------ 10 VIIe-1 78 2d1 AmB Arents, A2deirrood material, 0 to 6 percent slopes 1/---------- 10 IVe-2 76 3d2 AmC Arents, Alde n+ood material, 6 to 15 percent slopes 1/--------- 10 IVe-2 76 3d2 Art Arents, Everett material 1/----------------------------------- 11 IVs-1 77 3f3 BeC Beausite gravelly sandy loam, 6 to 15 percent slapes---------- 11 IVe-2 76 3d2 BeD Beausite gravelly sandy loam, 15 to 30 percent slopes--------- 12 VIe-2 78 3d1 BeF Beausite gravelly sandy lo�, 40 to 75 percent slvpes--------- 12 VIIe-1 78 3d1 Bh Bellin�am silt loam------------------------------------------ 12 IFIw-2 76 3w2 Br Briscot silt loam--------------------------------------------- 13 IIw-2 75 3w2 Bu Buckley silt loam--------------------------------------------- 13 IIIN-2 76 4w1 Cb Cvastal beaches----------------------------------------------- 14 VIIIw-1 78 --- Ea . Earlmont silt loam-------------------------------------------- 14 IIw-2 75 3w2 Ed Edgewick fine sandy Ioam-------------------------------------- 15 IIIw-1 75 201 EvB Everett gravelly sandy loam, 0 to 5 percent slo�pes------------ 15 IVs-1 77 3£3 EvC Everett gravelly sandy loam, S to 15 percent slopes----------- 16 VIs-1 78 3f3 EvD Everett gravelly sandy loam, 15 to 30 percent slopes---------- 16 VIe-1 77 3f2 EwC �Everett-Aldeiwood gravelly sandy loams, 6 to IS percent slopes------------------------------------------------------ 16 VIs-1 78 3f3 "?'" InA Indianola loaary fine sand, 0 to 4 percent slopes-------------- 17 IVs-2 77 4s3 InC Indianola lo fine sand, 4 to 15 ercent sl es------------- 16 IVs-2 77 4s3 InD Indianola loamy ine sand, 15 to 30 percent slopes------------ 17 VIe-1 76 4s2 KpB Kitsap silt loam, 2 to 8 percent slopes----------------------- 17 IIIe-1 75 2d2 KpC Kitsap silt loam, 8 to IS percent slopes---------------------- 18 IVe-1 76 �d2 RpD Kitsap silt loam, 15 to 30 percent slopes--------------------- 18 VIe-2 78 2d1 KsC Klaus gravelly loaary sand, 6 to 15 percent slopes------------- 18 VIs-1 78 3f1 Ma Mixed alluvial land------------------------------------------- 18 VIw-2 78 Zol NeC Neilton very gravelly loamy sand, 2 to 15 percent slopes------ 19 VIs-1 78 3f3 Ng Nexberg silt loam--------------------------------------------- 19 IIw-1 74 201 lac Nooksack silt loam---=-----------------------------=---------- 20 IIw-1 T4 201 No Norna sandy loam---------------------------------------------- 20 IIIN-3 76 3w2 Or Orcas peat---------------------------------------------------- 21 VIIIw-1 78 Os Oridia silt loam---------------------------------------------- 21 IIx-2 75 3w1 OvC Ovall gravelly loam, 0 to 15 percent slopes------------------- 22 Ne-2 76 3d1 OvD Ovall gravelly loam, 15 to 25 percent slopes------------------ 23 VIe�2 78 3d1 OvF Ovall gravelly loam, 40 to 75 percent slopes------------------ 23 VIIe-1 78 3d1 Pc Pilchuck loamy fine sand-------------------------------------- 23 VIw-1 78 2s1 Pk Pilchuck fine sandy loam-------------------------------------- 23 IVw-1 76 2s1 Pu Puget silty clay loam----------------------------------------- 24 IIIx-2 76 3x2 Yy Puyallup fine sandy loam------=------------------------------- 24 IIx-1 74 201 RaC Rag►ar fine sandy lo�s, 6 to 15 percent slapes---------------- 25 IVe-3 77 4s1 RaD Ragnar fine sar►dy loam, 15 to 25 percent slopes-------------=- 26 VIe-2 78� 4s1 " RdC Ragnar-Indianola association, sloping: 1/---------------------- 26 -------- -- --- ' Ragnar soil---------------------------------------------- -- rie-3 77 4s1 Indianola soil------------------------------------------- -- IVs-2 77 4s3 RdE Ragnar-Indi�ola association, moderately steep: 1/------------ 26 -------- -- --- Ra�ar soil--------------------------------------------- -- VIe-2 78 4s1 Indianola soil------------------------------------------- -- VIe-1 77 4s2 U.S.COVEFiN11�7T pRIN2'IIRG OFFICE:19?S O-4�-a� I GUIDE TO MAPPING UNITS--Continued Woodland Described Capability unit group p on mbol Mapping imit page Symbol Page Symbol Re Renton silt loam------------------------------------------=- 26 IIIw-1 75 3w1 Rh Rivenaash--------------------------------------------------- 27 VIIIw-1 78 --- Sa Salal silt loam--------------------------------------------- 27 IIw-1 74 201 Sh Sammamish silt loam----------------------------------------- 27 IIw-2 75 3w1 SkSeattle muck------------------------------------------------ 28 IIw-3 75 --- Sm Shalcar muck------------------------------------------------ 29 IIw-3 75 --- Sn Si silt loam------------------------------------------------ 29 IIw-1 74 201 So Snohomish silt loam----------------------------------------- 30 IIx-2 75 3w2 Sr Snohomish silt loam, thick surface variant------------------ 31 IIw-2 75 3w2 Su Sultan silt loam-------------------------------------------- 31 IIw-I 74 3w1 11i 7til�ila m�ck------------------------------------------------ 32 IIw-3 75 --- Urll�an land-------------------------------------------------- 33 -------- -- --- No Woodinville silt loam--------------------------------------- 33 IIw-2 75 3w2 1/ 7he compositian of these tmits is more variable than that of the others in the Area, but it has been ' controlled well enoug}� to intex�ret for the e�ected use of the soils. �� EXHIBIT "D" SOILS REPORT ADaPT � May 3, 2000 I WA99-4139 I Lyle Homes 1601 1 I4�'Avenue Southeast,Suite 100 � Bellewe,Washington 98004 Attention: Mr.Jack Willing � Subject: Subsurface Exploration and Geotechnical Engineering Evaluation Eden's Garden Parcel 2401 Northeast ZU'�Street i Renton,Washington Dear Mr. Willin I g' I This report summarizes our observations and conclusions, and provides geotechnical recommendations i �` � for development of ihe site. The project site is located at 2401 Northeast 20'� Street in Renton, Washington. The location of the site is shown relative to the surrounding features on the LocationrTopographic Map,Figure 1, attached to this report. Our services are provided at your request. We received verbal authorization to perform the work &om Mr. Reg Willing of Lyle Home. Our work was performed in accordance with our Scope of Work and Cost Estimate (ADaPT Proposal No. P-1613, dated April 3, 2000. Our understanding of the project is based on our discussions with you, our review of the preliminary project plans provided to us,our site reconnaissance, as we11 as our soils explorations and groundwater infiltration test results. The subject property is a rectangular-shaped parcel that covers approximately 3.44 acres and currently supports a house and garage on the northeast corner of the property along with several small sheds and outbuildings, as well as two other small wooden sheds and a dilapidated house elsewhere on the northem portion of the parcel. A 6-foot high rockery borders the house at 2401 NE 20`� Street to the east. The southern portion of the property slopes moderately to steeply to the north to northwest, and is variably overgrown with blackberry bushes, scrub and small trees. It is our understanding that the proposed development would include construction of a cul-de-sac roadway that provides access to twenty two (22) tots to be developed with single-family residences. In addition, an on-site stormwater infiltration trench is proposed for the north-central portion of the site. 1fie development would likely entail a significant amount of grading. The exisring site conditions are as depicted on the attached Site and Exploration 800 Maynard Avenue South ADaPT Engineering,Inc. Tel(206)654-7045 Suite 403 Fax(206)654-7048 Seattfe,Washington 48134 www.adaptengr.com ADaPT Engineering, Inc. Plan, Figures 2, which depicts the location of the explorations accomplished for this study, as well as topographic contours and other relevant site features. The purpose of our study is to conduct a geotechnical evaluation of the site and provide geotechnical recommendations for developrnent of the site for the project site. Specifically our scope includes the following: • Conduct a geotechnical exploration program at the site,including an infiltration test; • Provide a site plan showing the relative location of the test pits; • Provide detailed,interpretive logs of the test pits; • Provide an assessment of the subsurface conditions and their impact on construction; • Provide site preparation recommendations; • Provide building foundation design criteria; • Provide recommendations and design parameters for retaining walls and rockeries; • Provide drainage recommendations, including results of groundwater infiltration testing, and; • Recommendations for further work, if necessary. � SITE CONDITIONS SURFACE CONDITIONS The site is tocated at 2401 Northeast 20'' Street in Renton, Washington, Washington. The subject property is a rectangular-shaped parcel that covers approximately 3.40 acres. The property is generally characterized by a gently sloping northem portion that slopes down to the central portion of the property from the east sides. The eastern margin of the parcel adjacent to the existing house at 240I NE 20'b Street is marked by a 6 foot high rockery. The southem half of the property is characterized by an upper terrace at the southeast comer, which grades down moderately to steeply toward the northwest. This slope becomes steeper moving toward the north. The centr-al portion of the parcel is marked by a high � area which is related to a man-placed stockpile of fill soils. The western portion of the property is developed with a house with a basement, detached garage and several small sheds, along with an additional dilapidated house and three small sheds. The northem half of the parcel slopes down gentIy toward the northwest. A dirt roadway currently accesses the north-central half of the parcel. The exisring residence at 2401 NE 20'" Street supports a landscaped yard with a manicured lawn. A 2-foot high concrete retaining wall is present to the west of the house. The balance of the property is variably overgrown with blackberry bushes,short scn�b bushes and small alder and maple trees. The steep slopes along the east central portion of the property appear to have gradients of 45 to 60 percent,rising 12 to 18 feet. We did not observe evidence of subsidence or slope instability, including irregular or hummocky topography, pistol-butted trees, active or past active scarps, seepage zones, or hydrophyllic vegetation. No surface waters or surface water seepage was noted at the time of our site work. ADaPT Job No.WA00-4139 ADaPT Engirseering,lnc. May 3,2000 Page 2 ADaPT Engineering, tnc. SUBSURFACE CONDITIONS Subsurface conditions were evaluated by advancing eteven backhoe-excavated test pits across the parcel. Our field explorations were completed on April 6, 20�0 using a track-mounted backhoe under subcontract to our firm. In general, the test pits disclosed up to one foot of topsoil overlying loose grading to medium dense, moist to damp (locally wet), fine sand with variable silt and gravei. These soils extended to the full depth explored in test pits TP-1, TP-4, TP-7, and TP-10. These soils were � underlain in test pits TP-8, TP-9,and TP-11, advanced on the western portion of the site,by very dense, I moist, gray, silty, gravelly sand interpreted to be glacial titl that extended to the full depth explored tup � to 13 feet bgs). The upper sands were underlain and/or interbedded with silt-rich deposits at depths ranging from approximately 6%2 to 9 feet bgs in test pits TP-2, TP-3, TP-5, and TP-8, located on the southern portion of the parcel. Test pit TP-6, advanced on the central portion of the site,disclosed 8 feet I of variable loose to medium dense silty fine sand with gravel with organics, interpreted to be uncontrolled, man-placed fill materials, that extended to a depth of 8 feet bgs. These soils were underlain by a one-foot topsoil layer and the previously described native sands that extended to the full depth explored (up to 14 feet bgs).The location of the test pits, designated as TP-1 through TP-11, are shown on the attached Site and Explorativn Plan (Figure 2). The specific location and depth of the explorations performed were selected in relation to the proposed site features, under the constraints of budget and site access. The location of the test piis and other features shown on Figure 2 were obtained by hand taping from existing site features. As such, the explorarion location shown on Figure 2 should- be considered accurate to the degree implied by the measuring methods used. The test pit logs appended to this report describe the various types of soils encountered in the expiorations, based primarily on visual interpretations made in the field. The log also indicates the approximate depth of the contacts between different soil types, although these contacts rnay be gradational or undulating. Minor shallow groundwater seepage was observed in test pits TP-2, TP-3, TP-8, TP-9, and TP-11 at - depths ranging from 7 feet to 11 feet bgs. These wet zones appeared to be perched on top of underlying fine grained, less permeable silt-rich interbeds or glacial tili soils. Fine-grained soils are often characterized by seasonal near surface "perched" water, which collects and ponds above the relatively impervious glacial till or oiher silt-rich horizons during the wet fall winter and spring months. Groundwater conditions can vary seasonally with changes in precipitation, and may fluctuate with changes in site utilization and other factors. ADaPT Job No.WA00-4139 ADaPT Engineering,Inc. May 3,2000 page 3 ADaPT Engineering, Inc. Gro�ndtivater Infiltration Testing The proposed development calls for installation of an on-site stormvvater retention and infiltration system. ADaPT completed a groundwater infiltration test on the north-central portion of the property. The infiltration test was completed in accordance with the King County 1990 Surface Water Design Manual. Lnitially, ADaPT excavated test pits near the north and south sides of the area of the proposed infittration trench to depths of 11 feet to 13 feet bgs (test pits TP-8 and TP-11)_ The test pits disclosed fine sand with some silt overlying glacial till at depths of approximately 10 feet in TP-8 and 12 feet in TP-11. The Stormwater Manual requires that the base elevation of a proposed infiltration pond or trench be located at a minimum of 3 feet above an imperrneable surface (i.e. glacial till or "hard pan") or a seasonal high water tab}e. Test pit TP-8 was advanced in a lower area of the site. We installed three 6- inch diameter PVC pipes to depths of approxirnately S to S%2 feet bgs along the aiignment of the proposed tank location. The test locarions, designated INF-1, INF-2, and INF-3 are graphically depicted on Figure 2. ADaPT retumed to the site on April 9 to perform the infiltration tests. In accordance with the manual, each pipe was pre-saturated for 4 hours, and a head was maintained throughout the pre- saturation period. After pre-saturation,three falling head tests were completed at each location. The test results are included in Table l, Appendix C. The results of the tests indicated average infiltration rates ranging from approximately 71 inches to 128 inches per hour. No factor of safety has been applied to this field data. CONCLUSIONS AND RECOI�INIENDATIONS GENERAL Based on our interpretation of the subsurface explorations, and site reconnaissance, it is our opinion that the site is suitable for the proposed development provided that the geotechnical recommendations provided below are incorporated into the design and consh-ucrion. The medium dense or denser near surface native soils at shallow depth on the parcel wauld provide suitable support for the proposed � single-family residences and associated easements. 'The steep slope areas located along the north-central portion of the parcel will require special consideration with respect to development. Based upon our review of City of Renton "Critical Area" Maps, the subject site dces not appear to tie within the areas marked for the fotlowing critical area designations: • Erosion Hazard; • Slide Sensitive Areas; � • Seismic Sensitive Areas; • Coal Mine Hazards; and, " • Wildlife Areas (Forest/Open Space/Wetland). ADaPT Job No.WA00�139 ADaPT Engin�ering,fnc. May 3,2000 Page 4 ADaPT Engineering, Inc. However, the site is located within the City of Renton Aquifer Protection Area-2. The City of Renton � has special drainage plan requirements for development within the APA-2 zone. Based upon a I telephone conversation between ADaPT and our discussion with Mr. Neil Watts, senior technician with � the City of Renton Planning Department, a steep slope is defined as a 40 percent gradient with an elevation change of l5 feet or more. Based upon this definition, a small portion of the slope on the east- central portion of the parcel may be designated as a"steep slope"area by the City of Renton. However, Mr.Watts did not offer a suggested setback distance from the upper or lower slope breaks. EART�VORK Site Preparation The near-surface native soils encountered in the test pits generally consist of inedium dense sands with variable fines conient (estimated to be 10 to 20 percent)_ The fill soils on central portion of the site appeared to have a greater perceniage by weight fines. These silty soils are workable only during dry ' weather conditions. As the moisture content of the silty soils increases,the soil will become difficult, if not i impossible, to operate on or compact during wet weather conditions. The operation of heavy equipment at , the site can be expected to result in disturbance of the exposed subgrade soils during wet weather conditions. In areas where the silty soils are exposed or nsed as fill in wet weather,we expect that operation of heavy-wheeled equipment will result in significant ground disturbance. During extended periods of dry weather conditions, the moisture content of the soil may become depleted and moishue conditioning of the sand may become necessary. This may require the use of water trucks or other water devices. We therefore recommend that earthwork utilizing the onsite silty soils be imdertaken only during dry weather conditions, if feasible, to minimize grading costs. Earthwork during wet weather will require the use of select import fill soils, with the fines content limited to 5 per cent or less passing the U.S. No. 200 Sieve. The native soils, consisting of predominantly fine sands with some silt would be somewhat moisture sensitive, while the sil sand fill soils observed on the central 'on of the arcel would be hi 1 moisture sensitive. h' P� P �Y Subgrade Preparation We did not review a grading plan for the property at the time of this writing. However, we anticipate a significant amount of grading will take place. In addition, development of the proposed lots on the east- centi-al portion of the parcel will include encroaching upon the steep slope in this area_ Also, the topographic high area on the central portion of the property will ]ikely be reduced by grading. We anticipate the base of the excavations for the proposed structures will extend into the medium dense soils at shallow depth. Prior to placement of any fill material,the exposed subgrade areas should be compacted to a firm and unyielding surface. We recommend that a member of our staff evaluate the exposed subgrade conditions after removal of vegetanon and topsoil stripping is compieted and prior to placement of ADaPT Job No.WA00-4139 ADaPT Engineering,Inc. May 3,2000 Page 5 ADaPT Engineering, I�c. structural fill. The exposed subgrade soil should be proofrol3ed with heavy r�bber-tired equipment during dry weather or probed with a '/z-inch-diameter steel rod during wet weather. Any soft, loose or otherwise unsuitable areas delineated during proofrolling or probing shouId be recompacted, if practical, or overexcavated and replaced with structural fill,based on the recommendations of our site representative. Structural Fill All fill material used to achieve design grades within the building foundation,or parking and driveway areas should be placed as structural fill. The structural fill should be placed in horizontal li$s of appropriate thiclrness to allow adequate and uniform compaction of each lift. Fill placed below the building foundations and for wall backfill should be compacted to at least 90 percent of MDD (maximum dry density, as determined in accordance with ASTM D-155� to within 2 feet of subgrade, and 95 percent of MDD in the upper 2 feet below pavement and foundation areas. The appropriate Iift thiclrness wiIl depend on the fill characteristics and compacrion equipment used_ We recommend that the appropriate lift thiclrness be evaluated by our field representative during consh-uction. For planning purposes, we recommend a maximum loose-]ift thiclrness of 12 inches. We recommend that our representative be present during site grading activities to observe the work and perform fieId density tesLs. The suitability of material for use as structural fill will depend on the gradation and moisture content of the soit. As the amount of fines(material passing the U.S.No. 200 Sieve)increases,soil becomes increasingly sensitive to small changes in moisture content and adequate compaction becomes more difficuit to achieve. If it is necessary to import structural fill material to the site,we recommend that fill material consist of we11- graded sand and gravel with less than 5 per cent passing the U.S. No. 200 Sieve based on that fracrion passing the%,-inch sieve. During prolonged dry weather conditions, a somewhat higher(up to 10 to 12 per cent) fines content will be acceptable. Material placed for structural fill should be free of debris, organic matter, trash and cobbtes greater than 6 inches in diameter. Particle sizes larger than 3 inches should be excluded from the top 1-foot of filt. The moisture content of the fill material should be adjusted as necessary for proper compacrion. Suitability of On-Site Materiats as Fill Site grading plans were not provided to ADaPT at the time of this writing. However,we anticipate tnat the site work will include a significant amount of earthwork. During dry weather conshuction,any non-organic on-site soil may be considered for use as structural fill,provided it meets the criteria described above in the struchu-ai fill section and can be compacted as recommended. If the material is over the optimum moisture ADaPT Job No_WA00-4139 ADaPT Engineering,Inc. May 3,2000 Page 6 ADaPT Engineering, Inc. content (typically 2 to 4 percent above optimum) when excavated, it will be necessary to aerate or dry the soil prior to placement as structural fill. The workahility of material for use as structural fill will depend on the gradation and moisture content of the soil. As the amount of fines increases, soil becomes increasingly more sensitive to smalI changes in moisture content and adequate compaction becomes more difficult or impossible to achieve. In general, the near surface native soils encountered on the site were observed to consist of fine sand with variable silt,while silty sand uncontrolled fill deposits were observed in the central portion of the site. Exclusive of the silty sand fill soils on the central portion of the site, the other native sand deposits appeared to have a relatively moderate silt content(visually estimated to be 10 to 20 percent). We recommend reserving the most sand-rich portion of excavated soil for beneficial onsite use as structural fill. It may be necessary to moisture condition these soiis prior to use as struciural fill, particularly diuing dry weather conditions. The deposits of predominantly silt-rich soils encountered on the cenh-al portion of the site should be considered highly moisture sensirive. CUT AND FILL SLOPES Temporary cut slopes (foundation and utiIity excavations)may be necessary during grading operations. As i a general gt�ide,temporary slopes of 2H to 1 V{Horizontal to Vertical)or flatter may be used for temporary , ... cuts in the upper 9 or more feet of loose or medium dense sand soils. Steeper temporary slopes in the dense � or hard native soits may be used. For planning putposes, a 1H:1V slope may be used for the dense to very dense or very stiff soils, typicaIly encountered at depths below 9 feet or mo.re on the northern portion of the project site. These guideliries assume that all surface loads are kept at a minimum distance of at least one half the depth of the cut away from the top of the slope and that significant seepage is not present on the slope face. Flatter cut slopes will be necessary where significant soil moisture or seepage occurs. BUILDING FOUNDATIONS The following foundation recommendations aze presented for conventional spread footings bearing in suitable native soils, or for footings supported by structw-al fill, placed above suitably prepared native subgrade. For structures which can bear on medium dense or denser granular native soils,stiff or very stiff silt soiis, or on structural fill compacted to at least 95 per cent of the appropriate MDD in accordance with ASTM D-1557,we recommend they be supported on shaltow spread footings. In general,footings founded on undisturbed medium dense native soil or on properly compacted structural fiIt can be designed using an allowable soil bearing pressure of 2,000 pounds per square foot(ps fl for combined dead and long-term live loads, exclusive of the weight of the fooring and any overlying backfill. These values may be increased by one-third for transient loads such as those induced by seismic events or wind loading. ADaPT Job No.WA00-4139 ADaPT Engineering,ln� May 3,2000 Page 7 ` ADaPT Engineering, Inc. We recommend a minimum width of 18 inches for isolated footings and 16 inches for continuous footings. I All exterior footing elements sabjected to frost action should be embedded at least 18 inches below the I lowest adjacent exterior grade. Interior footings for heated spaces should penetrate at least 12-inches below finished �ades. We recommend that any disturbed soils in the footing excavations be removed, or if j practical, recompacted prior to concrete pIacement. All foundation subgrades should be examined by a I representative of our firm to verify adequate bearing surface preparation prior to placing concrete. � In areas where the shallow soils are unsuitable, organic rich, sofVloose, or over-optimum in moisture I content, we recommend that the unsuitable material be removed and recompacted if practical, or replaced I with structural fiil as described previously. Where unsuitable soils or old fill materiaI extend to or occur at I depth and overexcavation is impractical, we recommend that foundation svpport be extended through the I unsuitable or old fill material, if present. This is typically accornplished with deepened footings or by extending the footing stem wall. We estimate that settlements of footings designed and constructed as recommended will be less than 1 inch, with differential settlements between comparably]oaded footings of 1/2 inch or less. Settlements will occur essentially as loads are applied. Disturbance of the foundation subgrade during constcuction could result in larger settlements than predicted. FLOOR SLAB SUPPORT Slab-on-grade floors should be supported on native soils or on structural fill prepared as recommended. We recommend that floor slabs at the site be underlain by a 4-inch thickness of uniformly graded gravel or sand containing no more than 3 per cent fines to provide a capillary break. The capillary break material should be placed in one lift and compacted to 90 percent of the MDD. The capillary break material should be connected to a suitable drain oudet to provide an ezit for any accumulated seepage. A vapor barrier,such as a polyethylene Iiner, is also recommended. A thin layer of"clean" sand may be placed over the vapor � barrier and immediately below the slab to protect the polyethylene liner during steel and/or concrete placement. A subgrade modulus of 250 kcf(tdps per cubic foot)may be used for design. We estimate that settlement of the floor slabs designed and constructed as recomrnended, will be 1/2 inch or less over a span of 50 fee� LAT'ERAL RESISTANCE Lateral loads may be resisted by friction on the base of footings and floor slab and as passive pressure on the sides of footings. We recommend an ultimate coefficient of friction of 0_45 be used to calculate friction between the concrete and medium dense or denser narive soils or compacted structural fill. Passive pressure - ADaPT Job No.WA00-d139 ADaPT Enginearing,inc- May 3,2000 Page 8 ADaPT Engineering, Inc. may be determined using an equivalent fluid weight of 300 pcf(pounds per cubic foot) above the water table. This assumes that structural fill is placed against the sides of the footings and that the top of the fill is confined by either a concrete floor slab or pavement. A safety factor of 1.5 is conventionally applied to � these values. RETAINING AND SUBGRADE WALLS Retaining and/or subgrade walls can be supported on shallow footings founded on native soils or structural fill, if properly prepared. Footings bearing on at least medium dense native soils or structura] fill as described above can be designed using an average allowable bearing value of 2,000 (pounds per square foot) psf with a maximum toe pressure of 3,000 psf. Lateral loads on conventional retaining structures founded as described above rnay be resisted by friction on the base of the wall footings and as passive pressure on the sides of footings. We recornmend using an ultimate ccefficient of friction of 0.45 to calculate friction between the foundation and native soils or on structural fill. For the condition of a horizontal ground surface beyond the wall, the passive pressure may be determined using an equivalent fluid density of 300 pcf. This assumes that the foot�ngs are cast"neaY'against the cut,and that any fill soils around the wall are placed and compacted as structura]fill. A safety factor of 1.5 should be applied to these � values,for sliding and overtuming. The lateral active soii pressure acting on reinforced concrete retaining walls depends on the nature,density and configuration of the soil behind the wall. We recommend that walls supporting horizontal backfill be designed using an equivalent fluid density of 35 pcf for the condifion of a level back-slope behind the wall. This pressure criteria wouid apply for backfill placed within 2 feet of the wall being compacted by hand- operated equipment to a density of 90 per cent of the MDD and consisting of clean sand or sand and gravel. T6e recommended pressure does not include the effects of surcharges from surface loads,adjacent footings or the surcharge effects of sloping ground above the walls. We recommend the surcharge ef�'ect be evaluated using elastic methods. For the candition of a 2H: 1 V(Horizontal:Vertical)slope above the wall, � the lateral soil design pressure acting on the wall should be increased by 50 per cent. Adequate drainage behind any retaining struchare is irnperative. We recommend that a drainage system consisting of a minimum 24 inches of c]ean sand and grave) with less than 5 per cent fines be placed along the back of the wall. In addition,a drainage collector system consisting of 4inch perforated PVC or ABS � pipe should be installed behind the wall to provide an outlet for any accumulated water. The drainage material should be capped at the ground surface with 1-foot of relatively impermeable soil or otherwise sealed. ADaPT Job No.WA00-4139 ADaPT Engineering,inc• May 3,2000 0-,..�o ADaPT Engineering, Inc. ROCKERIES If rockeries are to be used on this project, we recommend that a setback for foundation elements be � provided for all structures. We recommend that building limits in these areas be located at or behind a point � such that a slope of 1 H:1 V slope from the base of the rockery would not encounter any foundation elements. We recommend that all rockeries be placed in accordance with current City of Renton specifications and be limited to the reshictions stated therein. A copy of a typicat rockery detail is included in Appendix D as an enclosure to this report. Rockeries should be constracted only with sound, durable rock. Drainage provisions and building and paricing setbacks are provided in local codes and standards. Depending on the rockery location and application,reinforcing rnaterial and select fill behind the rockeries may be required. Although commonly used in the northwest, it should be noted that unreinforced rockeries are actually landscape features rather than engineered retaining stnzctures. Their primary function is to provide a facing for othervvise stable slopes and to protect them &om erosion and sloughing. As such, the materials in a rockery face cut slope should consist of relatively dense strata. It should also be realized that rockeries, even when they are properly constn►cted,will require occasional maintenance. Therefore,rockeries should be located so that they are readiIy accessible for a contractor's equipment should repairs become necessary. -- PAVEMENTS i Pavement subgrade areas should be compacted as previously outlined, except that the minimum compaction achieved in the upper 2-feet below pavements should be compacted to 95-per cent of MDD, in accordance with ASTM D-1557. STTE DRAINAGE All ground surfaces,pavements and sidewalks at the site should be sloped away from the structure. Surface water runof�'should be controIled by a system of curbs,berms, drainage swales, and or catch basins, and conveyed to an appropriate discharge point. Roof drains for the structure should be tightlined separately from footing drains. Footing drains should be installed adjacent to all exterior footings. The footing drains should not be connected to the roof drain system until sufficient gradient will prevent roof water from entering or surcharging the fooring drain. Drains should also be provided behind all retaining or subgrade walls. Driveway/sidewalk surfaces should be sloped such that surface water runoff is directed away from the structure,and where appropriate collected and routed to suitable discharge points. Surface water should not be allowed to discharge over steep slopes. All stormwater should be collected and routed via rightIine to an appropriate discharge point. ADaPT Job No.WA00-4139 ADaPT Engineering,inc- May 3,2000 page 10 ADaPT Engineering, Inc. LIMITATIONS We have prepared this report for use by Lyle Homes, and members of their design team, for use in the design of this project Our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Variations in subsurface condirions are possible between the explorations and may also occur with rime. A contingency for unanticipated conditions should be included in the budget and schedule. Sufficient monitoring, testing and consultation should be provided by our firm during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated, and to evaluate whether earthwork and foundation installation acrivities comply with contract plans and specifications. When the design is finalized, we recommend that the design and specifications be reviewed by our firm to see that our recomme�ndations have been interpreted and implemented as intended. The scope of our � services does not include services related to environmental remediation and construction safety precautions. Our recommendations are not intended to direct the contractor's methods, techniques, sequences or procedures, except as specifically descnbed in our report for consideration in design. If there are any changes in the loads,grades,locations,configurations or type of faciliries to be constructed,the conclusions and recommendarions presented in this report may not be fulIy applicable. If snch changes are made, we should be given the opporiunity to review our recommendarions and provide written modifications or verifications,as appropriate. ADaPT Job No_WA00-4139 ADaPT Engineering,Inc. May 3,2000 page 11 ADaPT Engineering, Inc. Within the limitations of scope,schedule and budget,our services have been executed in accordance with generally accepted practices in this area at the time this report was prepared. No other conditions,express or implied,should be understood. Respectfully submitted, ADaPT Engineering,Inc. J � � t � j / ,; � . . �i ` Fes .Cace �� Senior Engineering Geologist �+1. GR O �4��W�f'L�'��'� � �� c� �=� , --�� =� , � :�x �: Kurt W.Grcesch PE 1 ° `� d`r,_..� � o�r � �. Senior Geotechnical Engineer �G`��S�CISTER�':�:�;; S�i;1V,�I.�:,":;; �J {�v 1 � �/, � E�(FiRES cr"I�/,-°~'._. KWG/ccc Enclosure: Appendix A- Figures Appendix B- Test Pit Logs Appendix C- Groundwater Infiltration Test Results Appendix D- City of Renton Rockery Detail ADaPT Job No.WA00-4139 ADaPT Engineering,Inc. May 3,2000 page 12 ADaPT Engineering, lnc. APPENDIX A ' FIGURES ADaPT Job No.WA00-4139 ADaPT Engineering,Inc. 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' -��---,... t, ! M LE � ��FT � 500M 1000n7 Priatcd frmn TOPOI�1999 W�d$acver Productions �vww.ta o.com ADaPT Engineering, �f1C. FIGURE 1 - Location/Topographic Map 800 Maynord Avenue S., Suite 403 Locatfon : Eden's Gorden Seattie, Washington 98134 2aoi ►vE 2otn street Renton, Washington 98056 Client : Lyle Homes Ph : 206.654.7045 Fax : 206.654.7048 Date : 4/17 0o Job � • S—WA-00-4139 .,�„ ,P ��:;:' . . � , . , ,, , ..,,.:, , •.;r;,..dd . ^-.�'i�tw tivy_�.,...t�*t`�^'`,� , . . , , � �»�;:iibrwf.. , . ,.. , . . ,„.. .� -.. �.�.,,i .� . . . .^ ' . rr,.�.;_,.s.. '(.�r�:.,., .. �.,;,.,y�. .. . i � Q � � M � � I I F— O ' W I l�i a � (� � o ? � �' � � .. w �' * 0 x Q V � O (� � "' '7 � (tf N [ O // // // Q� (n O� ' Y 'xo� d � C L � _�,� ;,�;'�� Q yr ��y � � �w� E a �.' . . � � ao WYcr.l.� � ..... .. .� : I tnZ O= \ � N yoca� � ro a e�'S,\ WNd' J '� i'_� �T" � � Cp .. 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'3 � I � s ' '�' T.,, ' ,'• ai�m. z i � �• ,L, ; t� ,: � �= -- — ;F; ; F =„ :. ,;� �„_ '� N ,� ,;; � r :, ;• ;:� i : - ;�:'� ^ ,._..� `r, - ri`s;F;; ::r'� o , f r ., a r (1-10)d �HO)d �N� +�H�-� �"�`�( o)e (ori) �. (HO) , '�T17Z' � , t ; . i i I �1+,ah�.ni6�/:+,,,. �,,,r�,,, inn i / k 4 ,.,,1� o .. � �' \.. {{ �/ , r _t ,. . r� �^T/'+rr� ��, /'� �' n , 6 . . : 1'�y :. :. r, � � ;j,,,m,n„w '' Qe� �,.. �� yrsrm. xit5ttitHN+t�f Wxi( Htttttsiki f ik n45 i kUftlnm �tW 1 tV.�iNUtw tau ftN t m u t�fi' nt�.1mN+1 ��d�1 tGhc;1 ua(uHl H�R htHntt+ritttMMtc tm+/t µN�. thN+h4Nt fFiMmtfNfMh�{ tk(Mr-�m� �i' �� /,��/� %;' � t j „ ....f,4�".�..,� w » .. ...�a. .�p��7•��,,��, '�� '4 '�".� L »�, .,'s �,FN J�# / /�� ''_ '".'_ ,,�,' �� .. � � , s��,� � /��6��y�% �/��/ �f� k / /��/G �` f �a ,,w 'R:;,.. ,,..Ww.. � ,� i,� �� u � ��- — M — -�j9(f t i e�' � �,;,:r k;�/ �,,,,,,,. Clrc: �.s > � ..�,� ,.i..;.,�i.�..,.<,.�< ,�'i'�/rv/b�iu,.-'/iU' 6'a''i�%i,:ci✓i:G,Uri�ra,�� ,. � tdNiwm 3a ADaPT Engineering, Inc. � APPENDIX B TEST PIT LOGS ADaPT Job No.WA00-4139 ADaPT Engineering,inc. May 3,2000 page 3 -- ADaPT Engineering, inc. TEST PiT LOG 800��^�^��°�5�� SEATTLE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654,7p4g I PROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-i 2401 NE 20th Street Renton. Washington 98056 Ekvatla�RulrMo: WA MMQan{.�YYd: WA 7�p� c�,a s,rx.o«�: w� csy o...so,,: w� AS-BU1LT DESIGN �� v �� _� � �� 3 Brown topsoil I Loose grading to medium dense, (@2.5 feet), mast,gray fine SAND,some silt I�, 5 Grades to gray/brown,gravetly,fine to coarse II 10 SAND,with some silt � �I Test pit terminated at 12 feet depth No seepage observed;caving observed throughout 15 20 25 30 ND 2id�0.D.Sp1lSpoon Sa�yw �_ Sale w�r I�M a D/iYq �y��/. Gnb Sanpb ! S•pap�Y�dcrr DATE I!� � �(— yCsopoO� � SdfeWrirtswl w�m�oot T�dArdyticalT�sigUs�d 1 —jL DATE r+� � Page: s,,,,p.,,a a.00Y..e �_ Pw�a cro�.w�.a. �m ►b A.00�.r 1 of 1 �m [ ATD A1 Tlm�d Drilling Start Date: 4/6100 Drilling Completion Date: 4/6/pp Lopged BY= �C ADaPT Engineering, inc. TEST PIT LOG 8°°M�A�e�e�,,s�� sEnrnE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654.7048 ^ROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-2 I 2401 NE 20th Street Renton, Washington 98056 o..zuu,r+a..�n: w� wacort�peoa: w,► �� II �w�e s,roc.o.+,aro�: wA c�Er,-�: w� AS-BUIL7 DESIGN 2k 1y W �m g � O� �� o� �3 rown o so Loose grading to medium dense,(@ 1.3 feet), tan-gray grading to gray fine SAND with s�me siit 5 ' Wet — Very minor perched water Dense, m�ist/damp,brown with gray,gravelly, �silty fine to medium SAND 10 Test pit terminated at 11 feet depth Slow seepage observed at 7.5 feet depth; some caving observed to 7 feet deep. 15 20 25 �� END Y-6d�Q D.S�iFSpom Ss�pY � Shtic W�lwN�DiiAO � �'a$�^D� ` S��PoP hAcatr DA7E \ _ � 1'CsoPoM � S�c Wsrr Lw�Y wm�o ra 7�d Nrlyyd TKyiy Usb . DATE �o+s J � SatrpN ml Rav�M � VwcJwd Crwn+d�.�r NR ►b R�m.or P3Q@: Z � 1 l ATD N Tirns d , Drilfing Start Date: 4l6100 Drilfing Completion Date: 4l6J04 Logged By: C� — ADaPT Engineering, lnc. TEST P1T LOG 800MaynardAvenueSouth.s��.� SEATTLE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654.7048 "ROJECT : Eden's Garden Job Number : wAoo-atss Boring No. : �� 2401 NE 20th Sireet � Renton, Washington 98056 � o.�ae+..<.: w� ww cw�a: w� tssrwo �,,,,,e s„�,�a,,,i,�: w� c�„y a„6,,,: w� ASBUILT DESIGN ad �� o Z� I �� _ �� o� �� 0 Brown topsoil - - - - - - - - - - - - - - - - Loose,grading to medium dense(@ 32 feet), brown grading to tan/brown,fine SAND with � some silt 5 ' Wet ' Stiff, moist, gray with tan,SILT with some fine = Perched groundwater I sandandday r - - - - - - - -- - Grades to medium dense,moist to wet,gray, sitty,very fine SAND with silt-rich interbeds �� Test pit terminated at 10 feet depth I Stow seepage observed at 6.5 feet depth; some caving observed through 6 feet depth , 15 25 �n aEND t z-tie,a a sy�s�a��. �_ sbee wr.t.Y.�r a�rv � c�n s.�a. � s..o.c•►,aacr _L as� � Y G�ap�oD� � Sbafc W�er LM �� TYV�d Ndytcal T�aYq Uwd WTE w�� \/ s�,�p.�a n.�..e �_ r.�.e c�.,e,�. rm �w n.�..y. Page: J� 1 ot 1 i / \ A1D A1 Tlm�d DriHing Start Date: 4/6J�0 Orilling Completion Date: 4J6/00 Logged By: CCC '- ADaPT Engineering, inc. TEST P IT LOG �00�►ard Avenue South,Su�e 403 SEATTLE, WASHtNGTON 98134 TEL•206.654.7045 FAX:206.654.7p4g ''ROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : Tp-a I 2401 NE 20th SVeet Renton, Washington 98056 I, EbralbnRd�: WA WMCon+p4bd: WA TESTN6 ��: w� ��,,,�,,,: w� AS-BUILTDESIGN �� _ �� _� �� - �� = m� �a �� Topsoil - - - - - - - - - - - - - - - - loose grading t�medium dense, (@ 2.5 feet), moist,gray,fine SAND wifh some sift 5 Becomes damp 1� Test pit terminated at 10 feet depth � No seepage observed,some caving observed throughout . 15 20 25 �n END � arc�a o.Syldr000�synyl. � s�e wa.l,w�r DriRo � cwe sarp. C s«pap.riaryor DATE . � t'C+bP� � St�eWaYLw�l wmaam Typ�dAnd�fni7�abiplb�d DA7E �ot� � Page: # \J�/ s�p.�a n.�.�.e �'_ v.�n.e cA,.w�.r ►a� w�.r i ot 1 1 / \ — A7D NiMd Drilfing Start Date: 4/6d00 Drilling Compte�on Date: 4/f✓pp Logged By: C� -� ADaPT Engineering, Inc. � TEST PIT LOG �Mayna►d Avenue South,�� , sEnrnE, wnsHr►��Tori sa�aa TEL:206.654.7045 FAX:206.654.7048 � ''ROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-5 2401 NE 20th Street Renton, Washington 98056 o.�a,a.i..k.: w� wa co��+..a: w� rEsrexi ASBUILT DESiGAJ °x; c�.,a s.rx.o.ra�: wA c�o�-�: w� � W � z W , y� � J < �� Z �t�J OC �; Loose,moist, gray,siity fine to medium SAND with some gravel(Fil) I - - - - - - - - - - - - - - - - Brown ropsoil , M�um dense, moist,oxidized brown grad�ng to tan-gray,fine SAND with some silt �i 5 Grades to wet,tan-brown,sitty fine SAND �� Grades to damp,fine SAND with some sitt Test pit terminated at 11.5 feet depth I No seepage or caving observed 15 20 25 �n . 3END � 2isi�Q 0.SplSboon� � Sbfe Ylir[rnr�Dri^0 � d�ab Ss�qM ! S�q�Ydo�or DA7E \ � TCsopiob � StileYla�rlw+l �a� �S'WdkrN4yT�stY�OU�W ' DATE � j \J�/ Sanph not R�m.�.�d � � PrdW Gandr�r ltll ►b imcc.�y Pa�B' [ / \ ATD At TYrr d � Of � DriUing Start Date: 4/6r90 Drdling Comple0on pate: 4J6�00 Logc)ed By: �C ADaPT Engineering, inc. TEST PIT LOG 8°°�,^�,��.5�� SEATILE, WASHINGTON 98134 TEL•206.654.7045 FAX:206.654.7048 pROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-6 2401 NE 20th Street Renton, Washington 98Q56 E7�rralbfRoMncs: WA WJCorry40ed: WA TESTWG caa.dswr�.o.l�: w� c.��ae��: w� AS-BUILTDESIGN € � Q� �� 'oa �� Surface grass over loose,mdst,brown,sitty fine SAND (Fill) Grades to medium dense, moist,dark brown, silty fine SAND wifh some gravel and organic fragments(Filn At 3.7 feet grades to gravelty,silty,fine to coarse 5 SAND with some roots(Fill) Medium dense,moist,gray,gravelly,si)ry fine to medium SAND (Fifl) - - - - - - - - --- - - - - - Brown topsopil Medium dense, moist,brown,sitty,fine SAND 10 Test pit terminated at 14 feet depth �5 No seepage observed,some caving observed throughout 25 30 GEND � 2i�d�R R S�R.Syom Ssrpb � Sdre W�Yr Lw�l�DriY � ��4� � Swpy�Mub/ DATE _ � 1'Csoprcb _]L_ SdMc W+�r lwr rnn�o ea 7yp�d/ud/tcal T�sfiq Us�d DA7E MM � p�: � X srww�w r�«.e �_ r.Rme c.a,.,e�... ►a+ w n�.r t d t [ / � A7D NTin�d , Dt�l'uig Start Date: 4/6r00 Drilling Completion Date' M6J00 Logged By: C� . -� ADaPT Engineering, Inc. � TEST PIT L�G 800""�^�^��.�� ' SEATTLE, WASHINGTON 9g134 TEL:206.654,7045 FAX:206.654.7048 I pROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-7 I 2401 NE 20th Street I Renton, Washington 98056 E)rv�aiR�lerrs: WA WdCorttiiV4: WA TESTNO c�+,�d a.+�o..a�: w� c��,sn.: w� AS-BUiLT DESIGN i i� �� 03 � Bto��p�iL - - - - - - - - - - - Loose to medum dense (@ 2.0 feet), moist, brown,silty�ne SAND gradng to fine SAND with some siEt Loose to medium dense,moist,gray-tan,fine i � SAND with some silt • � 10 Test pit terminated at 10 feet depth I No seepage observed,some cavng observed throughout 15 2 25 3� END I 2-YcA 0.D SpIFSyorn Sanp► � Sme Warr t�l a Dn7rV Grap Sa�pM � Snpap�h�dr�lor 1 �� _ � Y G+uRsb � Shtlt N1rir lwJ *nn.0 Fx Tyy�d Ardyiol T�Snp Usd DAlE w+o t �/ Sanp4 nol R�m�d � Prdrd G�wdwar HR !b fi�roy �9: 3 �� — � � 1 _ / \ - ATD M iYns d Drilling Start Date: 4/6r00 DrilCmg Completion Date: 4J6J00 �,,,,��i Rv- (:rr TEST PIT LOG AoaPT E��g, ��G 800 Maynard Avenue South,Suite 403 SEATTLE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654.7048 �ROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-8 2401 NE 20th Street Renion, Washingi�n 98056 o..��eonn�..»: w� w.�con+p+a: w� tFsrnq c��+e s�o.r�: w� c��,�,,: w� AS-BUILT DESiGN 0 �� i �� o� �; Brown topsoil - - - - - - - - - - - - -- - - Loose to medium dense(�2.8 feet)�moist, oxidized brown to tan-gray,silty very fine SAND grading to very fine SAND with some sift 5 Grades to wet,gray-brown,fine to medium � = Perched groundwater SAND with some silt - �a Very dense, moist,gray-tan,gravelly,silty fine SAND Tesi pit terminated at 11.5 feet depth Minor seepage ohserved at 9 feet,some caving � observed to 9 feet depth . 15 20 25 �� 4END � 2�Q D.SpiSyom 9^V� � 50/e 1M�7�r LsM Y D'irp � Gne Srrqti j y��kde� DATE � � t'(3�op.ab � S1yle War tw+l wm�oea Typ�d/4dyical T�sbq Und i DATE n» X s��p.�a r+.�w,a �_ v«o,.a�o.,aq... Nn w r+.�.y Page: i — 1 Ct 1 A7D At Tim�d Drilling Start Date: q/6/pp Drilling Completlon Date: 4/6/pp �ogged By: CCC ADaPT Eng�neering, Inc. TEST P i T LO G �Maynard Avenue Sa�th,S�� SEATTLE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654.704g pROJECT : 24oi,NE 20th street Job Number : WA00-4139 Boring No. : TP-s I Renton, Washington 98056 °ivatlOO�"': w� NMC0O1�`°" w� AS-BUtLT DESIGN �T°'a ; l?ro�d S�u1aw Elrraa�: WA Casi�q E1er+ton: WA '�� o� S3 �� ' Brown topsol - - - - - - - - - - - - - - - - Loose to medium dense(@ 2 feet),oxidized brown to tan gray,fine SAND with some silt 5 � — Perched groundwater I 10 ��omes wet — — — — — � Very dense, moist,gray,sifty,gravelly fine SAND (Glacial Tiil) Test pit terminated at 11 feet depth I Siow seepage observed at 9 feet,some caving observed to 8 feet depth I 15 25 30 �END � 2i�d 0.D.S�!-A�om Sarry4 � S1fe YY�Yr lsnl�f Dri[n0 � ��d� C SMpq�Y�dcabr DAiE _ � /�G�praD� � Slyk YY�Or lswl w�rna0et Trq d MI�d 7�stip Used DATE w» \J�/ Sa'npb�+o�t Aaao�arW � Awd�dCyoV�dw��r �IR W R�mv�y P89e� i / \ — ATD NTirt�d t � ' Driping Start Date: 4/6/00 Driiling Completion Date: M6/00 ��9�gy: CCC -- ADaPT Engineering, Inc. TEST PIT LOG �""�A��".S°�� 5EJITTLE, WASHINGTON 98134 TEL•206.654.7045 FAX:206.654.7pqg pROJECT : Eden's Garden Job Number : wAoa-41ss � Boring No. : TP-to 2401 NE 20th SVeet Renion, Washington 98056 �ea,R.�.��.: wA ��°^�= w� qS-gUILTDESlGN �T�+ Crwd Swhc�Elx+fan: WA Casinp Eler�Son: WA �- � ig O� �� 'o� �3 � Brown topsoil - - - - - - - - - - - - - - - - Loose to medium dense (@2.4 feet)ox'rdized brown to tan-brown, silty fine SAND to fine SAND with some silt 5 Grades to gray,fine to medium SAND with some fine gravel 10 Test pit terminated at 11 feet depth No seepage observed,some caving observed ___ throughout 15 20 I 25 3Q END � Z�iwA Q 0.SpiFSboa�S,s�qA � Saak Wrir lsral�DiiiiY � CraD SampM ! S�pop�Ydc�f � �� 1'Cwaprcb � Shtte W�r lrel �o� Typ�d IHryfral Tas74q Il�ed DATE �oie t P�9: � \/ SanqM nq iAm.w.d � P�JiM Grwdnalr � �'r°�f ' oe t 1 %\ ATD AtTlmsd Drilfing Start Date: M6/00 Drilling Cpmplgtipn pate: 4/E,/00 Loq�ed BY= CCC TEST PIT LOG ADaPT Engineering, lnc. , soo►�y�a nv�,�so�n.s�e� SEATTLE, WASHtNGTON 98134 I TEL:206.654.7045 FAX:206.654.7048 4ROJECT : Eden's Garden Job Number : WA00-4139 Boring No. : TP-11 I 2401 NE 20th Street � Renton, Washington 98056 , EbvbfmRal�rsnw: WA MMCanplAd: WA �}q c��e s.+x.o��so.: w� c��,: wA AS-B11�T DESIGN iW dm Z p W o'-�- �� _ �� o� �3 o�soi — — — — — — Loose to medium dense(� 1.8 feet),brown grading to taNgray,fine SAND some sift 5 10 — — — — — — — Minor wet zone � Wet = Very dense, moist,gray silty,gravelly fine to medium SAND Glacial Till Test pit terminated at 13 feet depth �� Trace seepage observed at 11 feet,some caving observed to 11 feet depth 20 25 zn END � rrd�a n.sp�syOo.�s�.a. � soak w,r t�a o� � c�sanp. j s..�.��amrr DATE \ _ � �'�a� � �wa.t..�.+ ,.,...ocx ryP.a tidrsf.y r.�y uw � o�rf n+. S � Sampb nat Ram�v�d � FarWd Giwd.r�r NA No limYarr �9: F — 1 of 1 �ro unT.a Drilling Start Date: 4J6✓00 Drilling Completion Date: 4,'6/00 �M^�+R"' r�C ADaPT Engineering, Inc. APPENDIX C I GROUNDWATER INFILTRATION TEST RESULTS ADaPT Job No.WA00-4139 ADaPT Engineering,Inc. May 3,2000 page 4 TABLE 1: INFILTRATION TEST RESULTS EDEN'S GARDEN 2401 NORTHEAST 20TH STREET RENTON,WASHINGTON ADAPT JOB NO.S-WA-00-4139 Infiltration tests were completed on April 9,2000. Test tNF-1 inches headfall elapsed time(minutes) ` Test 1 Test 2 Test 3 1 0:47 0:48 0:47 2 1:34 1:35 1:36 3 2:24 2:25 2:26 4 3:15 3:15 3:17 5 4:09 4:10 4:12 6 5:02 5:01 5:05 headfall in inchesmr. 71.50 71.8 70.8 Test tNF-2 � inches headfalt elapsed time (minutes) Test 1 Test 2 Test 3 1 0:44 0:44 0:46 2 1:28 1:29 1:32 3 2:18 2:19 2:23 4 3:12 3:14 3:18 5 3:52 3:54 3:58 � 6 4:34 4:34 4:35 headfall in 78.80 78.8 78.5 - inches/hr. ( ' TP-3/Test INF-3 inches headfa(1 elapsed Gme(minutes) � Test 1 Test 2 Test 3 1 0:26 0:28 0:24 2 0:55 0:57 0:56 - 3 1:24 1:28 1:27 4 1:51 1:53 1:54 5 2:16 2:19 2:18 6 2:46 2:50 2:50 headfall in inches/hr. 130.12 127.06 127.06 ADaPT Engineering, Inc. APPENDIX D -- � TYPICAL RO CKERY DETAIL ADaPT Job No.WA00-4139 ADaP7 Engineering,Inc. May 3,2000 Page 5 G" of 5/U" (-) � v� � �a��r Crusheil Rock • 1 OR fLA71[R 1 _� ��III _��= G �� - i ' _r--,� � ��II i! =�:•111�:�-J •'•�f�-:IIII � � IVI�� n��"�� uUllflflY Sf'�LLS u ��,�-- 0 oe Y � I VI � �� .-,; � N r�nz. Fnct J .- nr�raovGu FILTER FAORIC �, Y010 6" r � ¢�' hlllY QC• REQUIRCD UNOCR � .�UII�.�I I! CEf2TA I N S01 L COND I T I ONS i Ifii� s �' -�i�� * �_q��j,: �o � -��19_�i; y��-- CIIINK VOIUS, G" OR GRElITER � ' x � !-� o � "� � � 12" MINII�IUM o � � II� ' J � _ �r� _ I 1� � �� 6° PEa�oan�rEn o�n�r� P��e, auN To � I =1ll � 1�j� 5TOItM SCWER OR A5.D1REC7ED DY � �� i Y�V111 E=��(J-. TIIE ENGINEER 12" t•i l t!. �M��,�;.�� III IIII�I =:.II!!'�"",_�'. _ ��_--, UNDISTURDED SOIL OR COMP/1CTE0 FILI TIIE LONG DiMENStON OF TI�E ROCY,S S11/1Ll EXTENO ]Nt0 TIIE E11�2?ll TO f'ROVIDE 1•U1XiP1Uht STl1DIL1TY. TIIE ItOCK SH/1ll DE PLACEO 50 !1S TO LOCY. INTO TWO ROCKS (N TIIE r1ER. 1 f1AN ROCKS 15Q LDS. I-IIN. 300 LDS. MAX. SIT[ 10" IN I7S LE11ST DIh1ENS10N 2 11�N ROCKS 300 LDS. " 800 I.OS. " S12E 13" TO l�3" 3 r1�N ROCKS •000 IDS. ° 1500 LI;S. �� SI ZE 10�� TO zn�� 4 r1nN �ZUCY,S 15U0 L(!S. " 21UU IUS. �' ;1ZL• 24�� TO 7z�� 5 I1I�N ROCKS 2100 L(1S. " 3000 LOS. " SIZE 30" 70 30" Rockery Deta.ils "/1fVY ROCKERY GREATER T1111N 0 FEET (N IIEIGIIT t4UST OE DESIGNEO ANO 1NSPECTEO D1' A LICENSED ENGINEER IJITIi CEOTECIINICAI EXPERTISE. TIIE CNGINEER MUST CERTIFY TO TtIE CITY THE ROCKERY W/15 1HST/1LlED IN ACCOR0/1NCE W(TN PL/INS /IND SPEC(fICl1TfONS. � ROCKERIES ) FEE1 IIND LOWER SII�LI. OE CONSTRUC7ED OF 4 t•InN TO 2 MnN ROCKS FHOM . QOTT011 TO TOP. ROCKERI[S 7 FEET nN0 tI1GIlER S!I/1LL UE CONSTRUCTED Ot' S 11/1N TO 2 Ml1N ROCKS FR014 ' • � A D O P T E D 807T011 TO TOP, U� �'c1 CITY OF RENTON 0 ' • � � ��N '� LST DATE:I.N � _ . ____ � � 4.0 INFILTRATION POND ANALYSIS AND DESIGN Storm drainage that will be produced by the roadway will be controlled and conveyed via underground pipes to the wet vault and infiltration facility located adjacent to N.E. 20th Street. This underground vault will provide the required water quality treatment as required by the 1990 King County Surface Water Design Manual (KCSWDIVn. The infiltration facility has also been sized per the 1990 King County Surface Water Design Manual to infiltrate the 100-year post-developed storm event. Please see the enclosed calculations for further details. The contributing basin area for this facility is 152 acres. This includes on-site and upstream areas. The impervious area is 5.92 acres. The pervious area is 928 acres. These areas were achieved using 3.5.2.B of the 1990 KCSWDM. The azeas aze based on 3.5 DU/AC or approximately 39 percent impervious. 7535.009[DED/mm] 4.1 Inf'iltration Pond Calculations l N� � �T�t� t�`� ��C-s 6/20/O1 7 :18 : 1 am Shareware Release page 1 EDEN'S GARDEN INFILTRATION POND CALCS BCE FILE #7535-INF --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUNIMARY BASIN ID: A1 NAME: 2YR POST-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 15 .20 Acres BASEFLOWS: 0 . 00 Cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 9 .28 Acres 5 . 92 Acres TIME INTERVAL. . . . : 10 .00 min CN. . . . : 68 . 00 98 . 00 TC. . . . . 30 .00 min 30 . 00 min ABSTRACTION COEFF: 0. 20 PEAK R.ATE: 1 . 81 cfs VOL: 1 . 03 Ac-ft TIME: 480 min BASIN ID: A2 NAME: lOYR POST-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 15 .20 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERV IMP PRECIPITATION. . . . : 2 . 90 inches AREA. . : 9 .28 Acres 5 . 92 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 98 . 00 TC. . . . : 30 .00 min 30 . 00 min ABSTRACTION COEFF: 0 .20 PEAK RATE: 2 . 95 cfs VOL: 1 .76 Ac-ft TIME: 490 min BASIN ID: A3 NAME: 100YR POST-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 15 .20 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 9.28 Acres 5 . 92 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 .00 98 . 00 TC. . . . : 30 . 00 min 30 . 00 min ABSTRACTION COEFF: 0 .20 PEAK RATE: 4 . 71 cfs VOL: 2 . 69 Ac-ft TIME: 490 min BASIN ID: B1 NAME: 64% 2YR POST-DEV (WETVAULT) SBUH METHODOLOGY TOTAL AREA. . . . . . . : 15 .20 ACres BASEFLOWS: 0 . 00 cfs R.AINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 0 . 67 inches AREA. . : 9.28 Acres 5 . 92 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 98 . 00 TC. . . . : 30 .00 min 30 . 00 min ABSTRACTION COEFF: 0 . 20 PEAK RATE: 0 . 48 Cfs VOL: 0 . 23 Ac-ft TIME : 490 min r 6/20/O1 7 : 18 : 1 am Shareware Release page 2 EDEN' S GARDEN INFILTRATION POND CALCS �, BCE FILE #7535-INF --------------------------------------------------------------------- --------------------------------------------------------------------- HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib ' NUM R.ATE PEAK HYDRO Area cfs min. cf\AcFt Acres --------------------------------------------- --------------------------------------------- 1 1 . 808 480 44681 Cf 15 .20 ZY� PbsT 2 2 . 949 490 76743 cf 15 .20 IoYR t'� 3 4 . 713 490 117244 cf 15 .20 IbbYR �Sr 4 1 . 10 3 5 5 0 4 4 6 81 C f 15 .2 0 2,`(e I�tst� 5 1 . 161 690 76743 cf 15 . 20 �o�r� R�uFrp 6 1 . 283 990 117244 cf 15 . 20 ��yYQ ��p BARGHAUSEN DATE: � - �'� � d� PAGE OF �II CONSULTING ENGINEER: D- �S ENGINEERS, INC. � PROJECT#: ��35 PROJECT/SUBJECT: �� S C��(7�N " IJ� L - �'j � Vbl. . , ; . ; . . _ . . ,_ __ _- ..._._ - . : ; 1 - ; . - - l t � , � � � ; i � I __ _, _ _ __ . _ _..._ =- . . --; �---� ; � - ` I � �1�1�. 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T I ' ' , � ' � _ � i � . , ! � ; j i � __- '-------� -- - _- --------- �- � - ---�-- --- , , _ 1--r - --- - - __--•- - -__--,- ; �- 6/20/O1 7 : 18 : 1 am Shareware Release page 3 EDEN' S GARDEN INFILTRATION POND CALCS BCE FILE #7535-INF STAGE STOR.AGE TABLE CUSTOM STORAGE ID No. 1 Description: INFILTR.ATION POND STAGH <----STORAGE----> STAGS r---STORAGE----> STAGS <----STORAGPs----> STAGE <----STORAGB----> (ft) ---cP--- --Ac-Ft- (ftj ---cP--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-F't- 283.00 0.0000 0.0000 285.10 13841 0.3177 287.20 28861 0.6626 269.30 45002 1.0331 283.10 643.45 0.0148 285.20 14539 0.3338 267.30 29611 0.6796 2B9.4D 45901 1.0515 283.20 1287 0.0295 285.30 15236 0.3498 267.40 30361 0.6970 289.50 46600 1.0698 283.30 1930 0.0443 285.40 15934 D.3658 287.50 31111 0.7142 289.60 47399 1.0681 283.40 2574 0.0591 285.50 16632 0.3818 287.60 31860 0.7314 2B9.70 48198 1.1065 283.50 3217 0.0739 285.60 17330 0.3978 287.70 32610 0.7486 289.80 48997 1.1248 283.60 3861 O.OB86 285.70 18028 0.4139 287.80 33360 0.7658 289.90 49796 1.1432 263.70 4504 0.1034 285.60 18725 0.4299 267.90 34109 0.7830 290.00 50595 1.1615 283.80 514B 0.1182 285.90 19423 0.4459 288.00 34859 0.8003 290.10 51416 1.1804 283.90 5791 0.1329 266.00 20121 0.4619 288.10 35634 0.8180 290.20 52241 1.1993 284.00 6435 0.1477 286.10 20845 0.4785 288.20 36408 0.8358 290.30 53064 1.2162 264.10 7105 0.1631 286.20 21569 0.4952 288.30 37183 0.8536 290.40 53887 1.2371 264.20 7776 0.1785 286.30 22293 0.5118 288.40 37956 0.6714 290.50 54710 1.Z560 264.30 8447 0.1939 286.40 23017 0.5284 288.50 3H732 0.8892 290.60 55533 1.2749 264.40 9118 0.2093 286.50 23742 0.5450 288.60 39507 0.9070 290.7D 56356 1.2937 284.50 9789 0.2247 286.60 24466 0.5617 288.70 4O2H2 O.9247 290.80 57179 1.3126 284.60 10460 0.2401 286_70 25190 0.5783 288.80 41056 0.9425 290.90 58002 1.3315 284.70 11130 0.2555 286.BD 25914 0.5949 288.90 41831 0.9603 291.00 58624 1.3504 284.80 11801 0.2709 286.90 26638 0.6115 289.00 42606 0.9781 284.90 12472 0.2663 287_00 27362 0.6261 289.10 43404 0.9964 2H5.00 13143 0.3017 287.10 28112 0.6454 269.20 44203 1.0148 6/20/O1 7 : 18 : 1 am Shareware Release page 4 EDEN' S GARDEN INFILTR.ATION POND CALCS BCE FILE #7535-INF STAGE DISCHARGE TABLE DISCHARGE LIST ID No. 1 Description: INFILTRATION POND STAGB r-DISCHARGH---> STAGS c--DISCHARGE---> STAGfi r-DISCHARG$---> STAGB <--DISCHARG$---> (ftl --cfs-- ------- (ft) ---cfs-- ------ !ft) ---cfs-- ------- (ft) ---cfe-- ------- 283.00 1.0900 285.10 1.1850 287.20 1.2800 289.30 1.3720 283.10 1.0660 285.20 1.1900 267.30 1.2850 289.40 1.3760 283.20 1.0920 285.30 1.1950 287.40 1.2900 289.50 1.3B00 283.30 1.�980 285.40 1.2000 287.50 1.2950 289.60 1.3840 283.40 1.1040 285.50 1.2050 2H7.60 1.3000 289.70 1.3880 283.50 1.1100 285.60 1.2100 267.70 1.3050 289.80 1.3920 283.60 1.1160 285.70 1.2150 287.60 1.3100 289.90 1.3960 283.70 1.1220 285.80 1.2200 287.90 1.3150 290.00 1.4000 2H3.80 1.1280 265.90 1.2250 288.00 1.3200 290.10 1.4040 283.90 1.1340 286.00 1.2300 288.10 1.3240 290.20 1.4080 284.00 1.1400 286.10 1.2340 288,20 1.3280 290.30 1.4120 284.10 1.1440 286.20 1.2380 286.30 1.3320 290.40 1.4160 284.2D 1.1480 266.30 1.2420 268.40 1.3360 290.50 1.4200 284.30 1.152D 266.40 1.2460 288.50 1.3400 290.60 1.4240 284.40 1.1560 286.50 1.2500 288.60 1.3440 290.70 1.4260 284.50 1.1600 286.60 1.2540 288.70 1.3480 290.80 1.4320 284.60 1.1640 266.70 1.2580 288.80 1.3520 290.90 1.4360 284.70 1.1680 266.80 1.2620 286.90 1.3560 291.00 1.4400 284.80 1.1720 286.90 1.2660 289.00 1.3600 ' 264.90 1.1760 287.00 1.2700 289.10 1.3640 285.00 1.1800 28'I.10 1.2750 289.20 1.3680 6/20/O1 7 : 18 :2 am Shareware Release page 5 EDEN' S GARDEN INFILTRATION POND CALCS BCE FILE #7535-INF --------------------------------------------------------------------- --------------------------------------------------------------------- LEVEL POOL TABLE SUMMARY MATCH INFTAW -STO- -DZS- <-PfiAIC-> OUTFIAW STORAGE <--------DSSCRIPTION---------> (cfe) (cfe) --id- --id- <-STAGH> id (cfs) VOL (cf) 2YR ROUT� ..... .............. 0.00 1.81 1 1 283.39 4 1.10 2478.17 cf lOYR ROUTID .... .............. 0.00 2.95 1 1 284.54 5 1.16 10031.72 cf 100YR ROUTID ........ ......... 0.00 4.71 1 1 267.26 6 1.28 29280.22 cf KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5�[3 SCS�VESTERN WASHINGTON RUNOFF CURVE NLJMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1A rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY i HYDROLOGIC SOIL GROUP LAND USE DESCRIPTION� A B C D Cultivated land(t): winter cocxlition 86 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed or older second growth 42 64 76 Rt Wood or forest land: young second growth or brush 55 �2 n' 8� Orchard: with cover crop 81 88 yz y4 Open spaces, lawns, parks, gdf courses, cemeteries, landscaping. good condition: grass cover on 7596 or more of the area a 80 86 90� , fair condition: grass cover on 50% to 75°�6 of the area 77 85 90 92 Gravel raads and parking lots 76 85 89 91 _ � Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pavement, roofs, etc. 9 98 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 100 Sing{e Family Residential (2) Dwelfing Unit/Gross Acre % Impervious (3} 1.Q DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion -- 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/GA 42 . 4.5 DU/GA 46 5.0 DU/GA 48 5.5'DUfGA 50 6.0 DU/GA 52 " 6.5 DU/GA 54 . 7.0 DU/GA 56 . • Planned unit developments, % impenrious condominiums, apartmenfs, must be computed commercial business and . industrial areas. 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I`��i �� .. i 1 � ` � • • • ' • . � ��`��,�� . ♦ �.Y�. � . 1 •• • 1 1 � � � � ,�'��>�� . . . � � ,��'�1� �- � i R"'""= ► � . � -, -------- ► , �w, .. ..� �� 1 i 4.2 Wet Vault Calculations I ��TU�v LT' ` s 6/20/Ol 7 : 18 :44 am Shareware Release page 1 EDEN' S GARDEN INFILTR.ATION POND CALCS BCE FILE #7535-INF --------------------------------------------------------------------- --------------------------------------------------------------------- HYDROGRAPH SUNII�IARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres --------------------------------------------- --------------------------------------------- 2 9 490 76743 15 .20 3 4 . 713 4 cf 15 . 20 4 1 . 103 1 cf 15 . 20 5 . 1 690 76743 c 15 .20 7 0 .4 7 6 4 9 0 10 2 0 9 c f 15 . 2 0 �o N�TI�F 'Zc�.r�f-� Fr Q r,�L�?�t,t� -� � ��o'p v�w rU� �22. t��U�ri—T Vo[,uyu� �!1 D� _ `�4-� c.or.� x 18� t�1D� x �S r Ca� = I o,��8 c� � I o, �� b� T 4.3 Post-Developed Basin Area Maps .:� 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN Enclosed are typical calculations necessary for sizing of the pipe facilities proposed on this project. The rational method and Mannings formula were used for sizing purposes. Conveyance pipes have been sized to accommodate the 100-year storm event at the flowing fu11 condition. The intent of the pipe system within the proposed roadway is to convey stormwater runoff into a water quality and retention facility. The proposed facility has not been sized to accommodate any off-site development. ,��_�.O(_�9 �1)I�.�)'niii,�. r� �5 �``'_. �. ,;: � � 5.1 Piped Conveyance Calculations �: �� - .�- �. ... ��:;, . ��;, �;: }.: � .S 1 1 � *:�. �R� „�. �f�� '�.+.*P�j��s �� t x`= ,jg-��r' �.�" ,�:.<. .1�; �e,- .e�i t- ;� a,•�i��Z +8�� .{tf4 .Z�L 7 . �' r, �2 �� _ l j . a.✓ L. . in - - ,�'i Y ."�r �.{�.' �l vr 's� � .'f. � N � _ 4 ` � -{: .. �..�x � y r f�� +� '� t 1 �., �� ti d'�•�� rK�`� ,�'�i�� ¢� �� }:} -ta'7 �. .4 xi {.' Y z.�:. t''�'s.�,.. �" ��aZ '�'Fn _ s �.`3� y��^.:a9 . ; .,�' -_ ` r �� <. �y�'�y, . ... ,p�_. . v£' 1.. ':. ! F'_K' .. �G . Tns`P_" ._ �1 ��~ � ' ( � _ y ,y� � �s'�iV '�s{. � ' $t '�' :, :•.. r.�'" f'�.ja M...+�" e. . � . ' . . � + . " ' � - -: . �e �. •- .�..-�s�,a >.. .x. . ,��.., � , a . . �,s.�� :r � _ �: :_ < . . • , a.' �... . . ..x ,..:. i ' 75 xis BARGHAUSEN CONSULTING ENGINEERS-PIPE FLOW CALCULATOR using ihe Ratlonal Method&Manning Formula KING COUNTY DESIGN FOR 100 YEAR STORM JOB NAME: NOTE:ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING JOB#: 7535 DEFAULTS C= 0.75 n= 0.014 REVISED: d= 12 Tc= 6.3 A=Contributing Area(Ac) 9d=Design Flow(cfs) COEFFICIENTS FOR THE RATIONAL METHOD"Ir"-EQUATION C=Runoff Coefficient 9f=Full Capacity Flow(cfs) STORM Ar Br Tc=Time of Concentratfon(min) Vd=Velocity at Design Flow(fps) 2YR 1.58 0.58 1=Intensity at Tc(In/hr) Vf=Veloclty at Full Flow(fps) lOYR 2.44 0.64 PRECIP= 3.9 d=Dlameter of Pipe(in) s=Slope of pipe(%) 25YR 2.66 0.65 Ar= 2.61 L=Length of Pipe(ff) n=Manning Roughness Coefficient SOYR 2.75 0,65 Br= 0.63 D=Water Depth at Qd(in) Tt=Travel Time at Vd(min) 100YR 2.61 0.63 FROM TO A s L d Tc n C SUM A A'C SUM A'C I Qd 9f 6ld/6lf D/d D Vf Vd Tt CB7 CB6 0.66 1.67 30 12 6.3 0.014 0,75 0.66 0.50 0.50 3,19 1,58 4.27 0.370 0.420 5,04 5.45 5.04 0.10 CB6 CB5 0,51 7.40 102 12 6.4 0.014 0.75 1.17 0.38 0.88 3,16 2,77 9.00 0.308 0.379 4.54 11.46 10.07 0.17 CB5 C83 0.23 4.00 126 12 6.6 0.014 0.75 1.4 0.17 1.05 3.11 3.27 6.61 0.494 0.496 5.96 8.43 8.45 0.25 CB3 CBl 0.97 3.55 148 12 6.8 0.014 0.75 2.37 0.73 1.78 3.04 5.40 6.23 0.867 0.718 8.62 7.94 8.93 0.28 CBl VAULT 0.65 4.22 23 12 7.1 0.014 0.75 3.02 0.49 2,27 2.96 6.71 6.79 0.988 0.806 9.67 8.66 9.78 0.04 CB4 CB3 0.58 1.67 30 12 6.3 0.014 0.75 0.58 0.44 0.44 3.19 1.39 4.27 0.325 0.392 4.70 5.45 4.87 0.10 CB2 CBl 0.47 8.33 30 12 6.3 0.014 0.75 0.47 0,35 0,35 3.19 1.13 9.54 0.118 0.233 2.79 12.16 8.08 0.06 ge 1 5.2 Conveyance Area Map '�«: znv: r�or w,c. a�ar su�c. rnrcn sw.ce. src aoo�o�. <D: PPP-SS-TTTT �„°"`","°�"'r", a CITY OF � � � �, � „ � RENTON °w �MO' � DATUM °�"° °� OD ,"�� Pbnnlny/Bulldlnq/Publk WarM� O�pt. 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Y. . \, �1'i'm'M �l.M' � � \"'�'� RIM�5S�_6�.�J�� J'"tX�F'?,31'� �a+c[�s:,�':Hcafn•• .tSil.�{Ci. ' .�!'Y...QH.....� ( �� IE 8' PVC N�322.71 � ar'vr�exn t,►�E UkE�t'�LS 14tAU UNE STA11 iN94 I i �,` IE f0` P+F. E�3'L2.'/5 �� r � �.b.i�i"��o i�'��BF FFtOPCRTY CDRN[R � � n Sl'AA�PEU 'l.i 5524' � � � �� fl ' � . � �� $ a �� B�C.E.JOB N0. 7`� FYr.V:�SDSIfPAQI\7bJ6��vin9�75JS-Ml.dwo Dab/ilmr.01/40/1001 1�:�E srni.: i.so oen x.d.� n�a_s�ntiu_r,naiLo� — , . . ; . � , ;_ £ „ , _ , � , . � ;; . , .. . � - . . :.. . . _ > _ , . -_ �Y:- ��:.• f: , c� .� ry,;;: _ , r¢ :+t.�; i' j r,.. '�' ;;� � - +i '�. , � - � . . . . . , . . � ,-. . ' . •. � . ��'�� '�_,�#` .. . - h+ `...___... . . �� . �^�''r .. _ . , . r,s'R,+- _ . ., - - . .. . � �.. � �': [,. � 5.3 Miscellaneous Conveyance Calculations i For Overflow Spillways, Stand Pipes, Etc. � 6.0 SPECIAL REPORTS AND STUDIES Miscellaneous reports and letters have been included for review. 7535.009[DED/inm] 6.1 Subsurface Exploration and Groundwater Inf'iltration Evaluation by ADaPT Engineering, Inc., dated November 20, 2000 � 7 S3� ADaPT' � November 20,2000 WA00-4139 Lyle Homes 1601 - 114'"Avenue Southeast, Suite 100 Bellewe,Washington 98004 Attention: Mr. Jack Willing Subject: Subsurface Exploration and Groundwater Infiltration Evaluation Eden's Garden—Camas Avenue Parcel 18xx Camas Avenue East Renton,Washington � Dear Mr. Willing, ' This report summarizes our observations and conclusions, and provides results of groundwater Infiltration tests completed at the above site. The project site is located at 18� Camas Avenue East in Renton, Washington. The location of the site is shown relative to the surrounding features on the Location/Topographic Map, Figure 1, attached to this report. Our services are provided at your request. We received written authorization to perform the work from Mr. Jack Willing of Lyle Home. Our work was performed in accordance with our Scope of Work and Cost Estimate (ADaPT Proposal No. P-1706, dated October 5, 2000). Our understanding of the project is based on our discussions with you, our review of the preliminary project plans provided to us, our site reconnaissance, as well as our soils explorations and groundwater infiltration test results. The subject property is an irregular-shaped parcel that covers a reported 7,144 square feet and is � currently vacant. It is our understanding that this parcel was granted to Lyle Homes by the City of Renton for possible location of a storm water retention/infiltration system to serve the adjacent development to the east. The existing site conditions are as depicted on the attached Site and Exploration Plan, Figures 2, which depicts the location of the explorations accomplished for this study, as wel] as topographic contours and other relevant site features. 800 Maynard Avenue South ADaPT Engineering,Inc. Tel(206)654-7045 Suite 403 Fax(206)654-7048 � Seattle,Washington 98134 www.adaptengr.com i. � ADaPT Engineering, Inc. 'The se of ow stud is to conduct a '' purpo y groundwater infiltration test on the site. Specifically our scope includes the following: � Conduct a subsurface exploration program at the site; � Conduct a groundwater infiltration test per City of Renton requirements; • Provide a site plan showing the relative location of the test pits; • Provide detailed,interpretive logs of the test pits; I, • Provide results of groundwater infiltration testing,and; • Recommendations for further work,if necessary, PREVIOUS SITE WORK S ADaPT previously completed a geotechnical evaluation,including a groundwater infiltration test, of the I� Eden's Gazden parcel, which borders the current subject site to the east (ADaPT Job No. WA00-4139, dated May 3, 2000). SITE CONDITIONS I SURFACE CONDTITONS The site is located at 18xx Camas Avenue East in Renton,Washington. The subject property is irregular in shape and covers a reported 7,144 square feet. The parcel is vacant and supported a manicured lawn and several trees. The parcel slopes down from the cul-de-sac to the west to the east to a lower flat area, with site elevations ranging from 289.55 feet on the eastern portion of the parcel to 298.14 feet adjacent to the fire hydrant. No surface waters or surface water seepage was noted at the time of our site work. The site is bordered to the north and south by single-family residences, to the west by the asphalt paved cul-de-sac and more housing,and to the east by an overgrown portion of the Eden's Garden parcel. I SUBSURFACE CONDITIONS Subsurface conditions were evaluated by advancing two backhoe-excavated test pits across the parcel. Our field explorations were completed on October 17, 2000 using a rubber tire-mounted backhoe under subcontract to our firm. Test pit TP-1A disclosed 6 inches of topsoil overIying loose silty fine sand grading to clayey silt with some fine sand that extended to a depth of 8 feet. These silty soils were underlain by medium dense, moist, brown, fine sand with some silt and silt-rich zones that extended to the full depth explored (up to 13 feet). Test pit TP-2A disclosed thin topsoil over silty fine sand that extended to a depth of 5.5 feet bgs. These soils were underlain by stiff, moist, tan grading to gray silt ADaPT Job No.WA00-4139-1 ADaPT Engineering,Inc. November 20.Z000 Pa9e 2 ADaPT Engineering, Inc. with some sand-rich inclusions that extended to a depth of 14 feet bgs. These soils, in turn wer� underlain by fine gray sand with oxidized silt-rich inclusions that extended the full depth explored(up to , 15 feet bgs). The approximate location of the test pits,designated as TP-lA through TP-2A,are shown on the attached . Site and Exploration Plan(Figure 2). The specific location and depth of the explorations performed were selected in relation to the proposed site features, under the constraints of budget and site access. The locarion of the test pits and other features shown on Figure 2 were obtained by hand taping from existing site features. As such, the exploration location shown on Figure 2 should be considered accurate to the degree implied by the measuring methods used. The test pit logs appended to this report describe the various types of soils encountered in the explorations, based primarily on visual interpretations made in the field. The log also indicates the approximate depth of the contacts between different soil types, although these contacts may be gradational or undulating. Groundwater seepage was not observed in the explorations. Fine-grained soils are often characterized by . seasonal near surface "perched"water,which collects and ponds above the relatively impervious glacial till or other silt-rich horizons during the wet fall winter and spring months. Groundwater conditions can vary seasonally with changes in precipitation,and may fluctuate with changes in site utilization and other factors. Groundwater Infiltration Testing ADaP'T completed a groundwater infiltration test on the eastern portion of the subject parcel. The infiltration test was completed in accordance with the King County 1990 Surface Water Design Manual. The approximate infiltrarion test locations, designated INF-1, INF-2, and INF-3 are graphically depicted on Figure 2. Each pit was excavated until the underlying sand-rich soil unit was exposed, which ranged from approximately 10 feet to 12 feet bgs at the infiltration test locarions. ADaPT installed three 6-inch diameter PVC pipes to depths of approximately 11%z to 13 feet bgs. The pipes were installed at these depths due to the presence of the relatively impermeable overlying silt soils. In accordance with the test procedures outlined in the Manual, each pipe was pre-saturated for 4 hours, and an approximate 6-inch head was maintained throughout the pre-saturation period. After pre-saturation,two(2)falling head tests were completed at each location. The results of the tests indicated average infiltration rates were 115.2 inches per hour (INF-1), 16.8 inches per hour (INF-2), and 13.06 inches per hour (INF-3). No factor of safety has been applied to this field data. ' ADaPT Job No.WA00�139-1 ADaPT Engineering,Inc. November 20,2000 Page 3 ADaPT Engineering, Inc. CONCLUSIONS AND RECONIlI�IENDATIONS - � GENERAL • Based on our test pits explorations, the Camas Avenue East parcel is underlain by silty sands grading to I silts and clayey silts that extend to depths of 8 to 14 feet bgs. 'The infiltration test locations disclosed over 10 feet of low permeability silt-rich soils over the lower sand formarion. The infiltration test results for INF-1 were comparable to those obtained from the north-central portion of the Eden's Garden site, though they were an order of magnitude greater than those values obtained for INF-2 and INF-3. It is possible that the pipes at these locations were seated within a more silt-rich horizon than INF-1, and more sand-rich soils may have been present at a greater depth. If infiltrarion testing is required to a greater depth than completed for this study,it would be necessary to urilize an all-terrain drill rig. i LIMITATIONS We have prepared this report for use by Lyle Homes, and members of their design team, for use in the design of this project. Our report, conclusions and interpretations should not be construed as a warranty of the subsurface conditions. Variations in subsurface canditions are possible between the explorations and may also occur with time. A contingency for unanticipated conditions should be included in the budget and schedule. Sufficient monitoring, testing and consultation should be provided by our firm during construction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during ihe work differ from those anticipated, and to evaluate whether earthwork and foundation installation activiries comply with contract plans and specifications. When the design is finalized, we recommend that the design and specifications be reviewed by our firm to see that our recommendatians have been interpreted and implemented as intended. The scope of our services dces not include services related to environmental remediation and construction safety precautions. Our recommendations are not intended to direct the contractor's methods, techniques, sequences or procedures, except as specifically descnbed in our report for consideration in design. If there are any changes in the loads,grades,locations,configurations or type of facilities to be constructed,the conclusions and recommendations presented in this report may not be fully applicable. If such changes are made, we should be given the opportunity to review our recommendarions and provide written modifications or verifications,as appropriate. ADaPT Job No.WA00�139-1 ADaPT Engineering,Inc. November 20,2000 Page 4 I ADaPT Engineering, Inc. Within the limitations of scope,schedule and budget,our services have been executed in accordance with � generally accepted practices in this area at the time this report was prepared. No other conditions,express or implied,should be understood. Respectfully submitted, ADaPT Engineering,Inc. Charles C.Cacek c ��, ��,r„S�� 0 Senior Engineering Geologist ��'�' Q�,� �'{.Q' �=- G'�+. I y �'^.;`� � i �r: :' � Gw-f-/� t' �"' � �,, 'P,s 194F�i ,�� i�,-{� c,r .� r_��.j,-c Ul� I Kurt W.Groesch PE '�f-��`ut'v�� Senior Geotechnical Engineer c� �� yb E Fs�=t�S �i 15/U'L KWGlccc Enclosure: Appendix A- Figures Append'uc B- Test Pit Logs ADaPT Job No.WA00�139-1 ADaPT Engineering,inc. November 20,2000 Page 5 f- o � r � t,t r� _ m , '�! � !�. `�� ["D � ' � i � �- Sia r ' `� �'�� i — _ i _ � � ! :i� -_ �� ¢+ �l ' _• . V 1 -� ' �/�� i- �f' :�'� _ ' . � -, t t - • � / y �� :�' J�� - i ,t ,�' � ' _ �.1 _ _7 �J � �,: { , , - . . J 'j' p�' r `� • ' < � L � \ . �,�f ,� 1 �.l Y y,• r�• �� '`` 1. T . { �� '�r t' ,� . _.{ i •• . . _ 'l. ` ' `� ,f/ _ i �. _-- , h � .} . . . F �. �k� . � � , •�u �� jt ,.. .. . r ��. � 'r� -,� u `�. �� f. � . • s • . } � j`� �r � �� . . . t � �" � � a4r ' , _ �'xh . � ; � ._- �l �� n ��• .• 1 • t : ' ' i. �' [ � r F,� .�� .� f i�. �/ ,� • � ` �� ' _ .. 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FIGURE 1 - Location/Topographic Map 800 Maynard Avenue S., Suite 403 �� :Eden's Gorden Camas Avenue Porcel 18XX Camas Avenue East Seattle, Washington 98134 Renton, washtngton q�t ; Lyle Homes Ph : 206.654.7045 Fax : 206.654.704-8 Dat� : t�/to/oo ,�ob # : S—WA-00-4139-1 �� _-� \ / / . - � � - sHEa -1 / � '�� \ � / £ _.f \ � i � ( / / 1 � : - � � DECK � � / " : � � � � ; � / � / :.. � � � , � / � ' > / . -� .:. � . ��89- 30 ' S5 "W 1' �----, } � � � , / � / � � / 102 . 31 � l - � � � � � � / f o � / I � � � 1NF-1 � � � .�� _ � � „ � � ( � 9 �DEC. _ � � � � � � i \ iNF � _ -� N/ I 1 � TREE �� : f � 1°` f , � � f � � ` - � � � � ' � : � � � � � :_s I � � ' � �� / W TP-1 A TP-2A (3 1 1�"�ALDE S � � � i COL—DE—SAC � � ` � ' ' I t I I � � I 1 � � 8„�A � � ^ � � - � __ � LDER � I J � � I � � 9"�ALDER INF-2�� I � � I '"�--�� l � I � � � o „ -�- �o I I I J ��— � � 1 1 �ALDER � O � � � \ �� - � / ( � �C � I � � � � � � \ : ; LOG � � � � � � \ S 1� � � � � � ' ;-� LEGEND: B 0 R D E R Sc�, 6 � \ .�� 8� � � � TEST PIT N4. AND � � � I \ \ \ � -�- R. R. TI E OS �, ,�, I z APPROXIMATE LOCATION ` � � � \ ` _i TP-1A BORDER Q� � I � � i � � � � INFILTRATION TEST PIT N0. AND I ' APPROXIMATE LOCATION I I \ ' ` INF-1 � � � „ _ � � � � � IE 3 PVC -292 .01 � � o � � � o , � ` tNOT TO`SCALE MAP MODIFIED FROM BOUNDARY ADaPT Engineering, Inc. FIGURE 2 - Site � Expioration Plan ? AND TOPOGRAPHIC SURVEY � �ocatbn : Eden's cord� comos A��e Po�cd �' COMPLETED BY BARGHANSEN FENCE IS 1 .2 f NORTH 800 Maynard Avenue S., Suite 403 tsxx c�,os A�,�e Eost CONSULTIN ENGINEERS Seott�e, woshin ton 98134 Renton, woshington � OF PROPERTY LINE P�, : 2os.s54.7045 Fox : 2os.s54.�o4s � = ��"� "°m� � Dat� : 11�10/00 Job # ; S—WA-00-4T39—f �i _ ADaPT Engineering, Inc. � APPENDIX A FIGURES ADaPT Job No.WA00�139-1 ADaPT Engineering.Inc. November 20,2000 Page 2 ADaPT Engineering, lnc. APPENDIX B TEST PIT LOGS ' , - ADaPT Job No.WA00-4139-1 ADaPT Engineering.Ina November 20,2000 page 3 TE S T P I T LO G ADBPT Engineering� lnc. 800 Ma�rt�ard Avenue 5outh.Sw'Ee 403 SEATTLE, WitSHINGTON 96134 TEL:206.654J045 FAX:206.654.7048 PROJECT : Eden's Ganien Camas Avenue Parcel Job Number : WA00-4139-1 Test Pit No. : TP_-1 A 18XX Camas Avenue East Rerrton, Washington � � Elev�iorx 292 rt as.t *�� MATERUIL DESCRIPTION � �� - ; � � grass over rown -- - - - - - - - -- - - - - - - - - - - Stiff,mast,dark tan with black organics,sandy SILT to sitty fine SAND - - - - - - - - - - - - - - - - - -- - - Very stiff, moist,mottted tan with gray,clayey SILT with some very fine SAND 5 Medium dense, moist,brown�fine SAND with some silt,and silt-rich zones 10 Test pit terminated at 13 feet depth;No seepage observe. M'inor caving below 8 feet depth 15 20 �END � �,�..�.�� ,�.�8..�, a� � se�e,M.r,t�r e�me s.�o. ;°��°o o e.o s.�p. w� �eo�a�,� •' � yv.r yti.�.a.r�avv Pape: � �- F"''rd°'°""°"" � �� . 1 d t , ��ar�sr�rc o�e: �a n roo o�c«�anon�: �an�roo ��Br: cxc TE S T P I T L 0 G AoaPT Engineering. Inc. �� TEL:206.654.7045 FAX:206.654.7048 PROJECT : Eden's Garden Camas Avenue Parcel Job Number : WA00-4139-1 Test Pit No. : TP�2A 18XX Camas Avenue East Renton, Washington � ElevaOon:2so 1t a.s.l T�*+ �� MATERIAL DESCRtPT10N � �� u� s O � rown Loose, moist,brown,siity fine SAND,some gravel(FI� - - - - - - - - - - - - - - - - - - - - - - - - Medium dense, moist,oxidized brown�silty fine SAND 5 Stiff, moist,tan with oxidation SILT I 10 - Grades to stiff,damp,gray,SILT with minor sand-rich indusions: Grades to medium dense,moist,gray,fine SAND with oxidized siR-rich�ndusions 15 Test pit terminated at 15 feet depth. No seepage or caving observed �0 END � arew..t,�.a�, � ,Mn.a..ro a�� surew�r.tw�r s.awsr�y�. �o�oobo e.os.�p. s� � �_ r.�nw cso�.�r °"a.' � �""s«v.�.�'°`�r �� 1 t � , �►am,o sr�t�B: �a n�oo o�ug c«�,�uon o�e: �orl�roo �.o�ed By: ccc TE S T P i T LO G ADaPT Engineering� Inc. BOO lulaynard Avenue SouU►,SuiEB�OCi SEA7TLE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654.7048 PROJECT : Eden's Garden Camas Avenue Parc:el Job Number : H►Aoaa1�s-� Test Pit No. : INF-1 18XX Camas Avenue East Renton, Washir�gton � � �� MATERUIL DESCRIPTION � a g � �o-- ;� � s U C9 QrdSS OVBf — — — — — — — — — — — — — — — — — ——— — Stiff,moist,gray,SILT 5 Very fine sandy SILT � �� Grades to medium dense, moist,gray with brown,fine SAND, trace to some siR install 6"I.D. PVC at i 1.5 feet depth 15 ?0 "GEND � ss�we..�.,a:o�, � vr�.e..r,, a�tF .�L_, b7dcYlhOrlwr 6� �ayg��y �tO00y m0� � . ¢ � Nw Swp4 Ydatr P�� 1 t � PRid6n�d��r ! � , �attr,�s�t�ee: �a»roo o�c«�o�+oa�: �a»roo �o�ed sy c CCC TE S T P I T LO G ADBPT Engineering, Inc. 800 Maynard Avenue Saith.S1ilEs 403 SEATTLE, WASHtNGTON 98134 TEL•206.654J045 FAX:206.654.7048 PROJECT : Eden's Garden Camas Avenue Parc�l JOb N11111be� : WA00-4139-1 Test Pit No. : INE-2 18XX Camas Avenue East Renton, Washington � �� ;� MATERU0.IDESCRIPTiON � �� 0 6 u ce grass over rown P — —— — — — — — —— — —— — — — — — — — — Stiff, moist,gray,SILT varying to clayey SiLT with minor fine sand 5 � Damp,taNgray, SILT with some fine SAND 10 —— — — — —— — — — — — — — — — — — — — — Medium dense, moist,gray,fine SAND,some SILT Test pit terminated at 13 feet depth. Install 6"I.D. PVC at 13 feet bgs 15 20 GEND Z �Ma..�+.� � wd..B..�„ �� ss�ew..u� a� �� Q ��, - _� raai.d ciane.�. . _ . � w.a.s..p.0.rdaYr P�' 1 , DriRrg Sfart Da�: 10l 17/00 �►iqin0 Cortipletion Dame: t OJ17/00 Logped By: CCC ADaPT Engineering, Inc. TEST PI T LOG �°�^��5�°� SEATRE, WASHINGTON 98134 TEL:206.654.7045 FAX:206.654.7048 PROJECT : Eden's Garden Camas Avenue Parcei Job Number : WA00-4139-1 Test Pit No. : INF-3 18XX Camas Avenue East � Renton, Washington � t �s`na �� a�� MATERUIL DESCRIP'TION � �� u ace w s over m topsoi over s taNgray to clayey S{LT 5 Grades to moist to damp,fine sandy SILT 10 — — — —— — — —— — — — — — — — — —— — — Grades to medium dense, moist,gray�fine SAND�silt Test pit terminated at 12 feet depth Insta116" I.D. PVC at 12 feet depth 15 2n GEND � �Ma..�.�, � »r.B..�, �,� � srew.rtM �� Pwdwd Oia�d��r l�sLt - � Marr 8�py�Yiirre� . P��p(• 1 , Dnlb�y Start Dale: 1 d 17 i00 �w��w�►oar: �a��roo �o�ea ar: ccc 6.2 Limited Phase II Environmental Site Assessment by ADaPT Engineering, Inc., dated May 7, 2001 ; � � ��s` :. � '►�� ,� � T rw ��a+ : � �t� �� 1, - �' ks r: a� � „, � ,�� Y��z �v �+, i � „ >-� -a y �.;a� - �� { --a a ;� + �# � �i' . �1f� i"`�:'�� ..ti."'��< g ,` �f. ..� .py�,�.. ��'��e �:}� ��''`'7r��..�i'��R � � ��' �`� r �� _ _ ADaPT . � : May 7,2001 � WA01-6224 � Lyle Aomes 1601 - 114`�Avenue Southeast, Suite 100 Bellewe,Washington 98004 Attention: Mr. Jack Willing Subject: Limited Phase II Environmental Site Assessment Proposed Eden's Garden Development 2401 Northeast 20`�Street Renton,Washington Dear Mr. Willing, The following report summarizes the results of LSI ADAPT's (ADAPT's) Limited Phase II Environmentat Site Assessment at the above referenced site. Written authorization to complete our work was given by Mr. Jack Willing of Lyle Homes(ADAPT Proposal No.P-1841,dated Aprit 10,2001). BACKGROUND ADAPT previously completed a geotechnical assessment of the above mentione� property in April, 2000 (ADAPT Report No.WA00-4139,dated May 3,2000). The assessment included advancing eleven(11)test pits and three infiltration pits across the site to depths of up to approximately 14 feet below ground surface (bgs). The test pit locations are depicted on the enclosed Site and Exploration Plan,Figure 2. In general,the test pits disclosed up to approximately one foot of topsoil overlying loose grading to medium dense,moist to damp(locally wet),fine sand with variable silt and gravel. These soils extended to the full depth explored in test pits TP-1, TP-4, TP-7, and TP-10. These soils were underlain in test pits TP-8, TP-9, and TP-11, advanced on the western portion of the site,by very dense, moist, gray,silty, gravelly sand interpreted to be glacial till that extended to the full depth explored (up to 13 feet bgs). Ttie upper sands were underlain and/or interbedded with.silt-rich deposits at depths ranging from approximately 6'/z to 9 feet bgs in test pits TP-2, TP-3, TP-5, and TP-8, located on the southem portion of the parcel. Test pit TP-6, advanced on the central portion of the site,disclosed 8 feet of variable loose to medium dense silty fine sand with gravel with organics, interpreted to be uncontrolled, man-placed fill materials, that extended to a depth of about 8 feet bgs. These soils were underlain by a one-foot topsoil Iayer and the previously described native sands that _ extended to the full depth explored (up to 14 feet bgs). The soils encountered in the explorations did not exhibit obvious signs of contaminant impacts,such as staining or odors. 800 Maynard Avenue South LSt-ADAPT Tel(206)654-T045 Suite 4Q3 Fau(206)654-7048 Seattle,Washington 98134 www.adaptengr.co - LSI -ADAPT _ ___ ___ _ _. _ _ _ _ ._ _ - _.. __. __ _ _.__ _. r i ' At the time of the public hearing for the proposed residential development, local residents stated that the current owner of the property has stored hazardous materials on the property, such as petroleum products, i and disposed of concrete onsite. No information we were able to obtain indicated that previous analytical � screening or testing of soil or groundwater had been performed on the subject parcel. It is our understanding i that the hearing examiner stated to Lyle Homes that it would be prudent have a subsurface environmental i assessment completed on the property to assess the presence of potential contaminants in the subsurface. i PURPOSE SCOPE OF WORK I The purpose of this phase of work was to visually evaluate locations where potential hazardous chemicals are currently or may have been used, stored,or disposed, and assess the.condition of the soils in the vicinity of the possible on-site contaminant sources. This initial phase of work involved completing a visual reconnaissance of the parcel to assess potential Iocations where contaminants may have been or are currently stored. Based upon the results of the reconnaissance, ten (10) hand augered soil borings were completed across the parcel. The borings were advanced to depths of up to 5'/z feet below ground surface (bgs). Each of the borings were continuously I logged by an ADAPT environmental geologist. Selected soil samples from the borings were screened I with a photoionization detector(PID)equipped"with a 10.6 eV lamp. T'he PID is capable of detecting the I presence of volatile organic compounds, such as gasoline constituents and some chlorinated I hydrocarbons. Selected samples collected from each boring were collected in laboratory-prepared jars and were subsequently placed in a chilled cooler until they could be transported to an analytical taboratory under ADAPT's chain-of-custody procedures. Selected soil samples collected from the explorations were analyzed for gasoline through motor oil-range total pefroleum hydrocarbons (TPI-� by Washington Department of Ecology Method Northwest TPH — Hydrocarbon Identification (NWTPH- HCID). RESULTS Surface Conditions The site is located at 2401 Northeast 20'° Street in Renton, Washington,Washington. The subject property is a rectangular-shaped parcel that covers approximately 3.40 acres. The property is generally characterized by a gently stoping northern portion that slopes down to the central portion of the property from the east sides. The eastern margin of the parcel adjacent to the existing house at 2401 NE 20�'Street is marked by a 6-foot high rockery. The southern half of the property is characterized by an upper temace at the southeast corner,which grades down moderately to steeply toward the northwes�t. This slope becomes steeper moving towazd the north. The central portion of the parcel is marked by a high area,which appears to be related to a man-placed stockpile of fill soils. The weste7n portion of the pmperty is developed with a house with a basement,detached garage and several small sheds, along with two dilapidated houses and two small sheds. The northern half of the parcel slopes down gently toward the northwes�. A dirt roadway currently accesses � LSI-ADAPT Job No.WA01-6224 Page 2 � May 7,2001 � !SI -ADAPT the norih-central half of the parcel. The existing residence at 2401 NE 20�'Street supports a landscaped yazd with a manicured lawn. We observed two dilapidated house or shed structures,old crane truck and a bull dozer,as well as two other _ small sheds on the northwestern portion of the pmperty. A stockpile of paver-type bricks and a small amount.of concrete were observed near the northern margin of the site. We also observed severa155-gallon drums, including four drums adjacent to House No. 2, and a drum and an unearthed former underground storage tanlc(US'1�neaz House No. 1. We also observed small containers of paint products two partially full 55-gallon drums, and at least four 55-gallon drums in a bum pile associated with the sheds due south of the existing residence. We observed several one-gallon, 5-gallon containers, and a few 55-gallon drums of oil product (rnotor oil, hydraulic fluid, transmission fluid, and concrete form release compound) within shed nos. 1 and 2, along with surficial staining on the floors. We did not observe any areas of surficial staining . elsewhere on the site. We also did not observe any other evidence of significant recent or historic storage, handling or spillage of hazardous materials on the site. Subsurface Conditions The hand boring exploration locations are depicted on the Site and Exploration Plan,Figures 2. The hand boring explorations were advanced to depths of approximately 5%Z feet bgs. Soils conditions were generally consistent in all of the borings. In general,the soils consisted of dark brown grading to tan-gray fine sand with a trace to some silt that extended to the full depth explored. The soils encountered in these borings did not exhibit obvious signs of contaminant impacts, such as stains odors, or measurable PID readings. Copies of the hand boring logs are included in Appendix B. Analytical Test Results Shallow soil samples collected from the hand borings did not exhibit detectable concentrations of gasoline through lube oil-range TPH by Ecology Method NWTPH-HCID. Analytical Test results area summarized on Table 1,and analytical test certificates are included in Appendix C. CONCLUSIONS � During our April 25, 2001 site visit, we observed containers of hazardous materials at four locations on the property. These materials were stored in 55-gallon and 5-galloon containers and appeared to contained petroleum products, including motor oil, hydraulic oil, lube oil, and possibly dieseI fuel. We also observed old heavy equipment parked on the site. Surficial staining was apparent on the floors of the two dilapidated houses. Based upon the results of our current site work,soil samples screened from our site hand borings (HB-I through HB-10) did not exhibit obvious signs of contaminant impacts. Also, � eight (8) selected soil samples did not exhibit detectable concentrations of gasoline through motor oil- L.SI-ADAPT Job No.WA01-6224 Page 3 May 7,2001 I.. LSI -ADAPT I� __. _ _ _. _ __ _ _ ._ _ .. _. � range total petroleum hydrocarbons(TPI�. Alsq we did not observe evidence of any ASTs or USTs on I the property. Finally, fourteen (14) excavations completed for our previous geotechnical evaluation did not reveal the presence of stained or odorous soils. . It is our understanding that the site is planned for redevelopment into a residential subdivision. In ow opinion, it would be prudent to pmperly remove and dispose of the remaining hazardous materials on the i property. Even though our assessment did not encounter evidence of a significant release of contaminants . onsite, this does not preclude the possibility that minor isotated azeas of impacted soils may be encountered during redevelopmen� If such conditions are revealed during redevelopment, we recommend retaining ADAPT to help characterize and remediate such soils,if they are encountered. j LIMITATIONS This report has been prepared to aid in the evaluation of the site. Our conclusions and recommendations � have been prepared in accordance with generally accepted pmfessional engineering principles and practices. I We make no other warranty, either expressed or impli�l. Our conclusions are based on results of fieId explorations in a limited portion of the subject site, and on our interpretation of analytical results. If in the future conditions aze encountered that appear different from those described in this report, we must be notified so we may review and verify or modify our recommendations. ' I This report has been prepared for the exclusive use of Lyle Homes and their agents for specific I application to the project site. Use or reliance upon this report by a third pariy is at their own risk. ADAPT does not make any representation or warranty, express or implied, to such other parties as to the accuracy or completeness of this report or the suitability of its use by such other parties for any purpose whatever,known or unknown,to ADAPT. LSI-ADAPT Job No.WA01-6224 Page 4 May 7,2001 � LSI -ADAPT ___ _ ._. _ -- - . _ _ __. .. _ _ __ _ _ _ - ---- . . - -- _. _ . _ ' � We appreciate the opporlunity to be of service to you. If you have any questions or need additional. I information please contact us at 206-654-7045. � I Respectfully Submitted, ' ; LSI-ADAPT i � I Charles C.Cacek, Senior Project Manager Environmental Services � , � Daryl S.Petrarca,R.E.A.,VP Environmental Services Enclosures: Table 1—Analytical Test Results-Soil Appendix A-Figures Appendix B-Hand Boring Logs Appendix C—Analytical Test Certificates LSI-ADAPT)ob No.WA01-6224 Page 5 May 7,2001 r FIGURE 1: SUMMARY OF ANALYTICAL TEST RESULTS - SOIL EDEN'S GARDEN 2401 NORTHEAST 20TH STREET RENTON, WASHINGTON LSI - ADAPT JOB NO. S-WA01-6224 Samples collected on Apri125, 2001 Sample_ Depth PID NWTPH-HCID Number (feet) (ppm) Gasoline (ppm) Diesel (ppm) Motor Oil (ppm) HB-1/1-1.5 1 to 1.5 0 <23 <57 <110 HB-1/5-5.5 5 to 5.5 0 NT NT NT HB-2/1-1.5 1 to 1.5 0 <23 <57 <110 HB-2/4.5-5 4.5 to 5 0 NT NT NT HB-3/1-1.5 1 to 1.5 0 <21 <53 <110 HB-3/5-5.5 5 to 5.5 0 NT NT NT HB-4/1.5-2 1.5 to 2 0 . <22 <56 <110 HB-4/5-5.5 5 to 5.5 0 NT NT NT HB-5/1-1.5 1 to 1.5 0 <22 <56 <110 HB-5/5-5.5 5 to 5.5 0 NT NT NT HB-6/1-1.5 1 to 1.5 0 <23 <57 <110 ' HB-6/4.5-5 4.5 to 5 0 NT NT NT HB-7/1-1.5 1 to 1.5 0 NT NT NT HB-7/5-5.5 5 to 5.5 Q NT NT NT HB-8/1-1.5 1 to 1.5 0 <22 <56 <110 HB-8/5-5.5 5 to 5.5 0 NT NT NT HB-9/1-1.5 1 to 1.5 0 <24 <60 <120 HB-10/1-1.5 1 to 1.5 0 NT NT NT HB-10/3.5-4 3.5 to 4 0 NT NT NT MTCA 100 200 200 Notes: ppm=all concentrations reported in parts per million,which is equivalent to milligrams/kilogram - PID=Photoionization detector NWTPH-HCID=Northwest Total Petroleum Hydrocarbons-Hydrocarbon Identification MTCA: Model Toxics Control Act(Method A cleanup levels shown) ADAPT Engineering Inc. APPENDIX A FIGURES [.SI-ADAPT Job No.WA01-6224 Page 1 May 7,2001 � _ '` }; '`+ . � : . 4 :�._ � �Jj� F�.�`w . ( �} 1 ` � •,' `�`�y S�� 's� .y= ��t �j � � � { � 1 ._ � . � ._ \ _ � `� � - (, ��_�y� .. . �.. N � . �'' -- � � �'. y ., " f . � •. �i� •� } t t i � .• � f .: �; .Jri�; � .��'.1' ` f L s - .•� \ • �� ; "`� �` �'11��' 1/�� F �' - � f ' �. '� � " �� r � `.'`� �� F •.� _ � • v ; � �.• � � � �'� - � ��r.,r � 1 � `��, � .r� •• ��F �.. .��` ; : j tSJ � . f � 3 � , _.{ ,` U ` i�.F j .�(' _' _ }� . i_ .� _ .. ' r Ft �. �..' .,• . 2 � y{� � �: � ( % ! . � tt . •� .� • • '� :• J�; • �*( `� 1�1'. '{ . � �� jl i . `, • �.•-/ � ' � � �_�.V. ,� , � � �� i )'• �. . / ..a �,i � �K•� �1�� • � �f � , . �. '�- � � � � t� �. .., � � �� {�/ ' �' t ` � � . ':. . ,�/� .l : 1 - s•.},• • __ /�'.. i•� • •��+ ,' S: �,� � . .� . '�� / � ♦ � i j j� I. � i� - -� � . a� �t � � : . � ril � �� r: � >, _� r`�• � ' `�. '' ' '� ' � �. � ` �.� �C- -.�i:.-r - `}: ' � - - �.r�— * +'- - � i � { �; _ �. �1�aY¢I �9LS �i� `^'"`- � i ' ' t '' � � _. ` � w • _ s� 3 –y .�/ f ��.- .: �9sTN . � � � _ .(,j � r� �. .�rx ��. T ?3' - • ,� � . _ .i' r; \ �� i ] -�- _ -- ' `��;`�,`. �c"i L 1 � - -� 1�, l� �� tl6• 1 A4 S , � �� "z' � ;�' '' �P�k ,:Par(c,�if c� %` �� , � � � 2 :, `. • F �l � � \\ . � .p T •• -�' . �, i:� l��`,,\\�1h��\��i ,� ' � � � � .. . , - � • �� 3. � _ •�.__ r ��t� �` i - � • . � p'�� . � �t .�1�' �� .. •�(C + ` . `�� ( 1� �q? ( �.� .� ti / �� .., ( 1�� .11 � �. � ` .�� . � r12' '� �1 _ . ` - � .�h ��` �I � � � jr� � . . f � � •� L- �-- •�— --`tir -�-�,.— '�., . i �: ^ \ . . . �_ _ Q � t� ' ,�,�. .. ; ,, � � ;a �.:. � . . t- ; ,` '; ;�_--:�' �----` `�� `'( �`r �� , � � . � ,� �.;�, . t 1jt � � �� °° . �.— , + '• • _- If �/� /s ,��4 � � ` y _ :�` �� rJ ; � . i .f.:� � ^y � , - e� i . `_ �/�' ` T • � �� '�L.y-.''��i- a l � l N i:W r '•" •\�?5 � "� �,� � /�- r� -� � ��• �� .i "'_ �C.: r �` J ' �� ;' ,�-.. ; . � �' P7♦% . — �'� : ' f t:l �"'�.e�+• ^Powet --► � " NF� 1 ia�: c �� t%•; �� `• r�f..1�`' ��: - _ -_ _ � _ : F. '� •�.; i �.� ��5 ♦_ �f!� � � .� 'j � RTH R 0 � ts , -•a � . / �, , � , �A ,," � ��'� ' �'' '�'�'�� bs /� ��;��s .l, �r�` • .-_ �I�• � '� - — _ — � �..� - \ ' '� r __. �-w�s�.:_,� `�. .a r . ;. . �,.nK- { I I,, �, �� Y �/ � ��^ ` ��> r \' t � ` � . � �•-('f '`�- � � � . � �� y� f �. "' , " � . 1 �-_ _ l� � , � �� ,i l } K � L �• { �.�` :�5� t t�_–_ Tank•� � � � j`��, � .��, � � -,�:• i : • ■ ' � - ��, �� , :. E ` , � r� J � � C, 8 �� 'r !EIY ,� - ;� , r _ ; __.:s . _ ;�., �!� � � � I ` tmL � tOn j � ' - � �. ,�iu j `� �� I � r � • f t .�. �' � � - , -'� M�'� ■ -----�..t_ :! ��cr e �no,,, imnM Pridcd from TOPOI 01949 Wild9awer Produchmns www.bo .c� LSI ADAPT, INC. FIGURE 1 - LocationlTopographic Map II 800 Maynard Avenue S., Suite 403 Pro�ect : Eden's Garden tocatlon : 2401 NorthEost 20th Street Seattle, Washington 98134 Renton, woshington CNertt : Lyle Homes Ph : 206_654.7045 Fox : 206.654.7048 Date : 04 26 01 Job # : S—WA-01—fi224 .. z � ' X . - - _-`_Y�` � S �`t • �l+, I - ''tY.i 3 � \ � PROPERTM LA� r y {i 1., . C �` \..... .? ' x � '�q� _ ! . � y t �t� { x I �p 1:-. : � f �R__. .,�� 7( X _ ' . � `` � r " Paq$ j ' -X � � k^`. n�� ` { y e o CaARDEN SHED � o m� � � \4, � +:` . Sm.� � f `- D i SSG�IL.LON DflUM I _. "'�- � r ? � _� y �;� � T � � � �, i�-=- s TP-2 �_ • � � ? ` R,.. � � � �� t�� Q � � � � r �?' � v � 5SGl1LLON DRUMS •�< �.�s=;y'- y s.' .e IN BURN PN.E _ ;r`��i � TP-1 t<3 TP-4 I . r o � o \ a H � � F � I � � � � TP-9 x � x �I . a - G_ '� " a TP-7 � , � _, ,� r � � , = i {� �' f� — ` � � � �� , �-x + h r HB-7� Shed \ I , _ .�� `� ' = T , � s: � INF-2 ►�-a m �2 �\ �` , INF-3 „� 1; �:. H� INF-1 �.r� � a� ` r � } � � ' .�� $ �--�� ' ' sroacP� �. kas� TP-8 �� a�sscnu � an so� ' t �F TP-11 oFsa�cs �� _ sroc�� : ; o ow nAEMourrren "�+ 3oo-c� usr a -6 �J ,,J� CRANE TRUCK �� +� � �SSGALLON D � r' 3 : O, -3 � :� � oo � ; .... .. _� � � r 7 ►�g - H&Z i'."' "'- C� no � `��` OlD BUILDOZER 'a � � � � AND 5vCAL.LON DRIAiA }+y � \\ I ei J � �\ S I / L � � T'1 � O 3 a LEGEND: _ ' . 0 50 100 TP'� � - APPROXIMATE SCALE IN FEET {� TEST PIT No. AND APPROXIMATE LOCATION (ADAPT, APRIL 2000) � ; � INF-1� INFILTRATION PIT No. ANO IOCATION ADAPT, APR�� 200o ADaPT Engineering� �I1C. FIGURE 2 — $it@ � Expioration Plan � � Location : Eden's Gorden � �.� 800 Maynard Avenue S., Suite 403 2401 NorthEost 20th Street a � HAND BORING' No. AND APPROXIMATE LOCATION (CURRENT STUDY� Seottle, Washington 98134 Renton, Woshington � PcoM> � Ph : 206.654.7045 Fax. : 206.654.7048 p�atet:' o/2s/ot S �ob � : s-wc,-o�-s2z4 ADAPT Engineering Inc. APPENDIX B i HAND BORING LOGS .. LSI-ADAPT Job No.WAOlfi224 Page Z May 7,2001 LSI ADAPT HAND BORING LOG �°�^��S°�� _ _ _- _ _ _ �. W�►,� �,� . _ TEL:206.654J045 FAX:206.654.7048 PROJECT : Eden's Garden Job Number : wAo�-s22a Boring No. : HB-� �CATION : 2401 NorthEast 20th SVeet Renton, Washin ton L le Homes Ground Su�face Eleratbn: WA Casing Elevation: WA Elevatfon Retererxe: WA age: I, 1 Of 1 �g� SOIL DESCRIPTION �� Q� �3 AS-BUILT WELL DESIGN �� = d Old flooring over, moist,dark brown,silty,fine SAND,some roots ,,,,,,,�,� Grades to moist, light brown with oxidation,fine HC1D SAND,some si�,no odor i Grades to tan-gray,fine SAND,trace to some siR , 5 Boring terminated at 5.5 feet depth. � 10 15 20 25 30 � Z N �srr eb�do�wil _� suao www l.iid r o�i0 � c�E SanpN ISd QarW � c�ain sto ArrA+4 DATf Ikws da�/�j = XlC E � S1r'I T�Sr�ql� � Shfe Warr Iwd � T�d Ardylkal Teiq pof�rd � \� SrnpA na1 wca�d � Pwtlyd Owd�rr 1A W RRsrs� � Z00 Wah /� ATD At 7Yir d Uiip �R�d�a LL Start Date: Oq/25rp1 Completfon Date: Oa/25/Ot Logged By: C.C.C. � HAND BORING LOG LSI ADAPT eoo uray�a�d a,�,e so�n►,s�4oc; _ _ _ _ .. _ _ , _ _ Seatlle, WasAington. 96134 _ ____. _ TEL•206.654.7045 FAX:206.654.7048 PROJECT : Eden's Garden Job Number : WA01-6224 Boring No. : HB-2 �CATION : 2401 NorthEast 20th Street Renton, Washin ton L le Homes Ground Surtace Elevation: WA Cas�g Elevarion: WA Elevatlon Reierence: WA �e' 1 of 1 �� SOIL DESCRIPTION �� Q� �� AS-BUILT WELL DESIGN �� d ; Moist,dark brown,siity�fine SAND,some roots Grades to moist, light brown with oxidation,frne N�* SAND,some sift, no odor H� Grades to tan-gray,fine SAND,trace to some sift 5 Boring terminated at 5.0 feet depth. 10 15 � 20 25 30 :ND �� D�msNc Car Pwnta��rT�t p�iY � g�iM(y�q�W � C�S�� C SdL¢We�r linl�I (3raE (7L fms sho+w� (E4�+��SPT Bb�ccut tlw�n� DA7E . � � Slrb/Ttb Srapb � Shmc W�r lwd � TYW d MWr/cal Tvrq PrkmNd � � 7DOYII�A X B�yA�naR Raarw�d � PvNMd Oiourd�wr � ��l (7G 6rs Yqwrd � = A7D AtT1ns d DrEp Start Data: 04l25J01 Compfetlon DatB: 04l25J01 Logged By: C.C.C. HAND BORING LOG �si A�aPT ��,A,�e�.�� Seattle. WashingDon 96134 _ __ _ -- _ _ _ TEL 206.654.7045 FAX:206.�4.7048 PROJECT : Eden's Garden Job Number : WA01-6224 Boring No. : HB-3 �CATiON : 2401 NorthEast 20th SVeet Renton, Washin ton L le Homes Ground Surtace Elevatia►: WA Casing Elevallon: WA E{evaHon Reterence: WA �8� 1 of 1 �� SOIL DESCRIPTION �� o� �� AS-BUILT WELL DESIGN �� O Z m L 3 Moist,dark brown,silty,fine SAND,some roots Grades to moist, light brown with oxidation,fine �+- to medium SAND,trace silt,no odor �� Grades to tan-gray, fine to coarse SAND,trace to some silt _ 5 Boring terminated at 5.5 feet depth. 10 I � i5 20 25 30 =ND � _ �s�r��q � smo w.�r i;w.pa�ro � ca�e s.�nq.�S,o.as�j � o�n s�z.M+r.+s (x M..Yom9 x p( Slieb/Tib San4� � Shce WaYr ls�wl � Typ�d Mdyfcal TdrO Prlonnd � � � � 4001MatA z \X/ S�N naR Rxorssd � Pwrl�d bw+��Yr � �� r1G 6w�Iciw� G / ` _ Start Date: 04/25J01 Completlon Dale: 04J25J01 Logged By: C.C.C. k LSI ADAPT HAND BORING LOG �°�A�� _ _ _ . _ Seattle. Washh,pta, 98,34 TEL:206.654.7045 FAX:206.654.7048 - PROJECT : Eden's Garden Job Number : wAo�-s22a Boring No. : H&4 �CATiON : 2401 NorthEast 20th Street Renton, Washin on L le Homes Ground Surface Elevatfon: WA Castnp ElevaUon: WA Elevatfon Reterence: WA 1�� } SOIL DESCRIPTION �� Q� �� AS-BUILT WELL DESIGN � � = 4 3 Moist,dark brown,sitty,fine SAND,some roots Grades to moist, light brown with oxidation,fine �p►+- SAND,some silt, no odor `�p Grades to tan-gray,fine SAND,trace to some silt 5 Boring terminated at 5.5 feet depth. 10 t5 20 25 r30 ; _ � __.iEND orwde ar w�.r+�rrr.a �_ stiro wrw twwi r ws,� c3.b s.��p.(so+as�,f ca.in sro.Nw�.�s � � (Eqi/wlwt SPT BbRoi�l aAOM�� p�7E � �b � (x��^I � � Strby TuE�Sr�p� � Shtle WaYr Lwwl � Typ d MryUnl T�iq qrknn�d � 2C0 Yfad� � v Swipb M Rso�sd � P«dW OarA�lv � ��Y � (7G inw Mow/d LL /� ATD At7lm�dpiq Start Date: 04/25�01 Completion Date: 04/25/01 - Logged By: C.C.C. LSI ADAPT HAND BORING LOG 800�^�� - _ _s�ne, wasr,�� es,3a : _ - TEL 206.654.7045 FAX:206.654.7048 PROJECT : Eden�s carden Job Number : WA01-6224 Boring No. : HB-5 ;ATION : 2401 NorthEast 20th Street Renton, Washi ton L le Homes Ground Surface Elewatfon: WA Casing Elevatlon: WA ElevaUon Reterence: WA ��= � �� SOIL DESCRIPTION �� 4� �� AS-BUILT WELL DESIGN �� 0 z d 3 TEsrHc; Otd flooring over, moist,dark brown,siliy,fine SAND,some roots ��. I Grades to moist, light brown with oxidation,fine HC1D SAND,some sitty, no odor Grades to tan-gray,fine SAND,trace to some silt 5 I Boring terminated at 5.5 feet depth. 10 i5 2 i 25 30 I ,ND � � DymrNe Carr PwiMarrlwTd � sutlo w�r tswi r D�o � ta�b arryr(sb�aerW � u��+� (EQArrwR srT eb.cau�do� �p��77E « •' � Slrey T�b ylnyb _]G_ SYatle WaYr lwl � 7}p�d A�rlyt�d T�atnp paApimd )OC � 200 Wah X S�npM nof R�aors�d � Pwdrd O�oudiwYr HH !b RRwary � (�(fi�� 3 ATD NTYn�dpiq StaR Da[e: p4125d01 Completion Date: OM25/01 Logped By: C.C_C. � LSI ADAPT HAND BORING LOG _ �°�^�^��°�� _ _ _ Seattle, Washinghm. 98134. _.._ _. _ TEL•206:654.7045 FAX:2D6.654.7048 PROJECT : Eden's Garden Job Number : WA01-6224 Boring No. : HB-s 'ATION : 2401 NorthEast 20th Street Renton, Washin ton L (e Homes Ground Surtace Elevation: WA Casfig Elevatior►: WA ElevaUon Reteietxa: WA ��' � 0 �� SOIL DESCRIPTION � �� Q� �� AS-BUILT WELL DESIGN �*«� O = d a Moist,dark brown,silty,fine SAND,some roots Grades to moist, light brown with oxidation,fine �� SAND,some silt, no odor H� Grades to tan-gray,fine SAND,trace to some sift 5 Boring terminated at 5.0 feet depth. 10 15 i � 20 25 30 I :ND � = q�.nc an.rw�ra�rr r..t � sme wrr t�.i r w�v � c�,e s,r„p.lsd ae�W � ean sw�wy.r (EW�Jwt svr a�o.Aou+,row�i 7E (��""yo""� � SI�y T�b Ss�qY � Statle WiYr Lml � Tp�d Arrylkd TMiq Pwknrrd � � � . � 200YVuh X 8�ea1 Raorawd � PMci�d t#oud��Ir � �v )OC �� Start Date: 04/251pt � Completion Date: 04125/01 Logged By: C.C.C. HAND BORiNG LOG �si a�A� ��A,�S�.�� ,_ , __ _ _ , _ _ . SeatUa. Washington 98734 - - _ . TEL:206.654.7045 FAX:206.6b4.7048 � PROJECT : Eden's Garden Job Number : wAot-s22a Boring No. : HB-7 �ATION : 2401 NorthEast 20th Street Renton Washin ton L Is Homes Ground Surtace Eleva�on: WA Casing Elevation: WA Elevation Reterence: WA �= 1 oF 1 �� SOIL DESCR(PTION � �� s� �� AS-BUILT WELL DESlGN �� = m � ; Moist,dark brown,silty�fine SAND,some roots Grades to moist, light brown with oxidation,fine SAND,some silt,no odor Grades to tan-gray,fine SAND,trace to some silt 5 � Boring terminated at 5.5 feet depth. � 10 15 20 25 30 L_.._�VD T �P��Ca»Prn�tsrwrT�l �. . .� Smlk 1►W lwwl�D�iq . � (�a!g��p�4�) � � QaY�S�Arr�/�Y —1— (E4A�a�r�SPT Bb�mu�slww� DcA77E (%mws do�w� � SIr6y71b�9s�pb _Y_ Shlel��YrLM � Typd/b�ly6eaiTeafrqPaMn�d � - DATE A � 2pp Wah X 9amp4 not Mtanrnd � P�rdrd Ooudw�r Iri qu R�� +�� ATp /{t Tinr d Driq Start Date: 04/2S,101 Completion Date: ON25I01 Logged BY: C.C_C. HAND BORING LOG �si A�A�-r 800 Mapna�d Avernie Soutb,Su�400 _ _.. _ _._ _. _ _ Seattle, Washirplon 98134 — . _ TEI:206.654.7045 FAX:206.�4.7048 PROJECT : Eden's Garden Job Number : WA01-6224 Boring No. : 1-�e-s �7CATION : 2401 NorthEast 20th Street , Renton, Washin on L te Homes I Ground Surface Elevation: WA Casirg Elevatlon: WA Elevadon Reterence: WA �a9e�'- � � �� SOIL DESCRIPTION �� s� �� AS-BUILT WELL DESIGN - uaow►�oar 0 a 3 �� Moist�dark brown,sitty,fine SAND,some roots Grades to moist, light brown with oxidation.fine ��+� SAND,some silt,no odor Grades to tan-gray,fine SAND,trace to some silt 5 ' i Boring terminated at 5.5 feet depth. 1 II 5 II 20 25 30 'END ; � = c�nw,x cr,.ren.r+nws r.� � su�e w,r.trv.�a�on�ro � c�r.e s�p�i��vN � �"�~�` �svr e�o.icou�dn.�� p��7� � (%�v�^I � SIrEp Tub�9rM� �L_ Shtc Vfair lMl � Tpp�d Mylld Twyq prlamd ' '� � 200 YMaU � � Sanipb not Mcorw�d � Patlyd fi�oudnlr � �°°p� � (%Anw Iow� Start Date: 04/25/01 Completion Da�: OM2.5J01 _ Logged By: C.C.C. � L f ADAPT ! ORING LOG �°°�^��5�� ' _ _ - -- __ _ seae�e. w�n�►,� �e,sa .. _ _ ' TEL•208.6b4.7045 FA?C:206.65�4.7P18 � PROJECT : Eden's Garden Job Numbe� : WA01-6224 Bo�ing No. : HB-9 CATION : 2401 NorthEast 20th Street Renton Washin on L le Homes � Ground Suriace Elevalfon: WA Casfng Etevatfor►: WA Elevatfon Reference: WA �e' 1 of 1 �� SOIL DESCRIPTION �� o� �� AS-BUlLT WELL DESIGN ►�� : d a '�s'*'° 0 Old flooring over, moist,dark brown,silty,fine , SAND,some roots ,,,,,,,r�. i Grades to moist,light brown with oxidation,fine HO1D � SAND, some silty,no odor ' Boring terminated at 2.0 feet depth. II i0 II � . I 15 20 25 �30 ---;ND = c�ront cy»v...a�■.T..� � s�ro w..,i,;:��o�o � ar.e s.np.(sa asn��- � m.w sa,� @�4w.w,r srr ee.�wr y,o.,� ��„�7� (�c�r■s y�o.�l �.. SIrE�T�9��pb —�L Shcle WaYr lw� � T�q d Ar�1�7ea1 T�siq 7�lemrd � � 200 Wa�A �/ . S�npY oal R�m�w�d � O'wrJrd @ourd� m �� (7611n�t a1o�� Data: 04125+01 Completlon Da�: 04/25J01 Logged By: C.C.C. HAND BORING LOG �sr AnaP-r ��A,�.��.�� _ _ __ _ _ __.seanle, wasFungmn.sst3�t:.--: --- - _ , _ . _ , _ TEL:206.654.7045 FAX:206.664.7048 PROJECT : Eden's Garden Job Number : wAot-s22a Boring No. : HB..�o �CATION : 2401 NorthEast 20th Street Rent�n, Washin ton L le Homes Ground Surtace ElevaUon: WA Casing Elev'ation: WA E)evatfon Reterence: N!A 1�of 1 �� SOIL DESCRIPTION � � �� AS-BUILT WELL DESIGN � 0 Old flooring over, moist,dark brown,siliy,fine SAND, some roots I Grades to moist, light brown with oxidation,fine SAND,some silty,no odor Grades to tan-gray,fine SAND,trace to some silt � Boring terminated at 4.0 feet depth: 10 I 15 20 25 3 : L__�ND ' � o�xe an.r.�.��n�.rT� �._ aao w.rr�:+�c n� � a,s a.nq.lsar cvsW � c�str.Nwrsi (Eaw�«+svr eiowca.t dowN oditE pc m.s�w�w� � SIrEr T+b�51i�Y � SIa11¢YWYr lwd . � Tjp�d MJ�Ara17�q Prfanwd � DA1H �' 200YVad� btinyl�nal R�ow�W � Pwdrd(�oudMwr ►R Ib RKw�I . . � �� X . . = ATD AtTbrdLliq . � StaR Date: 04/25/Ot Co�npledon Dats: 04125�I01 �099�BY= C-C-C- ADAPT Engrneerrng Inc. i _.__ _ _. _ _ _ . . _ _ _. __ __ _ J II APPENDIX C li ANALYTICAL TEST CERTIFICATES I �'� LSI-ADAPT Job No.WA01 fi224 �8�3 May 7,2001 . .• : . �, _ .� :._ - - . . .r . ,� �., OnSite . ; ��=��. �nvironmenta! Inc. Analytical Testing and Mobile Laboratory Services � May 1, 2001 - Charles Cacek LSI-Adapt Engineering . 800 Maynard Avenue S, Suite 403 Seattle,WA 98134 . Re: Anatytical Data for Project WA01-6224 Laboratory Reference No. 0104-181 Dear Char(es` Enclosed are the anafytical results and associated quality control data for samples submitted or, April 25, 2001. The standard policy of OnSite Environmental Inc. is to store your samples for 30 days from the date of receipt If you require longer storage, please contact the laboratory. We appreciate the opportunity to be of service to you on this project If you have any questions concerning the data, or need additional information,please feel free to call me. Sincerely, � � . . . � , - _ David eister � � ` . . . � �. - . _ - Project Manager : . • , . Enclosures ' _ � 14648 NE 95th Street,Redmond,WA 98052•(425)883-3881•Fax(425)885-4603 . - � � � . 2 Date of Report: May 1, 2001 . _ Sampies Submitted:Aprii 25, 2001 . Lab Traveler. 04-181 . Project: WA01-6224 ` � NWTPH-HCID � Date E.xtracted: 4-25-01 � Date Analyzed: 4-25-01 � - . Matrix: Soil . , .: Units: mg/K9 (PPm) � ClientlD: " HB-1/1'-1%2 HB-211'-1%i HB-3/1'-1'/2 �� LabID: 04-181-01 04-181-03 04-181-05 II Gasoline: ND ND ND I PQL: 23 23 21 Diesel Fuel: ND ND ND PQL: 57 57 53 - Heavy Oif: ND ND ` ND PQL: 110 110 � 110 Surrogate Recovery: - o-Terphenyl 141% 143°� 127% , Flags: . . �� - -i. � ' . - . . . � _ . _: . . . ,. ' . ,: . . . .. . 3 : . .. : ; Date of Report: May 'F, 2001 , � Samples Submitted: April 25, 2001 ; Lab T�aveler. 04-181 . . .. Project�WA01-6224 . NVYTPH-HCID ' Date Extracted: 425-41 _ Date Analyzed: 4-25-01 � � Matmc: Soil . • : Units: m9�9�PPm) Client iD: . HB-4/1%i-2' HB-5/1'-1'/�` HB-6/1'-1'/Z � Lab tD: . 04-181-07 04-181-09 � 04-181,11 Gasoline: ND ND ND PQL: 22 22 23 DieseF FueY. ND ND ND PQL: 56 56 57 Heavy Oil: ND ND ND PQL: 110 110 110 Surrogate Recovery: o-Terphenyl � 134°� 132% 138% Flags: _ , . � � - � _ • . : : _ �..' - . . _ . �4 Date of Repart: May 1, 2001 . � Samples Submifted:April 25, 2001 ; . � Lab Traveter. 04-181 � - : Project:WA01-6224 � NWTPH-NCID . Date Extracted: 4-25=01 Date Analyzed: 4-25-01 �. . Matrix: SoiF •� Units:- mg/K9 (Ppm) Client ID: HB-811-1'/: H6-9/1-1'/: Lab I D: : 04-181-15 - . 04-181-17 .. ` . _ Gasoline: ND ND I PQ L: . 22 24 Diesel Fuel: ND ND PQL: 56 60 Heavy Oil: ND ND PQL: 110 120 - � Surrogate Recovery: _ _ - - � aTerphenyl 133°� - . , -. '128% Flags: � . - - _ � . � � _ � , . . - - 5 II ` ` _ __ - -.:.- -�.,_ , �.. :.=. ._ . :_-. __ _._. . -_-..' ;�:. � ._ -___ __ _ _ _ - - ,. _ . _ _. I Date of Report: May 1, 2001 � Sam les Submitted:A ril 25, 2001 - II P P Lab Traveler. 04-181 � Project WA01-6224 . NWTPH-HCID � METHOD BLANK QUALITY CONTROL Date E�racted: 4-25-01 Date Analyzed: 4-25-01 � i Matrix: Soil . Units: m9�K9 (PPm) : . . Lab ID: . M60425S1 Gasoline: ND PQL: 20 Diesel Fuel: ND . PQL: 50 . Heavy OiL ND PQL: 100 Surrogate Recovery: - � o-Terphenyl 131% . . . � � - _ Flags � . . . I . � � _ � . � � - s _. . _ _ -� - _-._ � , . ---_ . ,_ . __ _ _ , _ . ___ :-.,-- : . �.._ _._... _ I _ . Date of Report: May 1, 2001 Samples Submitted: Aprii 25, 2001 . ; Lab Traveler. 04-181 Project:WA01-6224 � _ % MOISTURE Date Analyzed: 4-25-01 Client ID Lab ID % Moisture H&1i1'-1'/Z 04-181-01 12 HB-2/1'-1%' 04-181-03 13 H B-3/1'-1%z 04-181-05 6.0 H B-4/1'/2-2' 04-181-07 " 1 p HB-5/1'-1'/' 04-181-09 10 I HB-6/1'-1'/2 � 04181-11 13 - � HB-8/1'-1'/Z 04-181-15 11 HB-9/1'-1%' 04-181-17 17 I _ . . .. 7 ' . ' - . . s `.��t�l. On ite . : � 3 Environmentai 6�c. DATA QUALIFIERS AND ABBREVIATIONS ' ' /A-Due to a high sample concentration;the amount spiked is insufficient for meaningful MS/MSD recovery data. B-The analyte indicated was also found in the blank sample. C-The duplicate RPD is outside coMrol limits due to high resutt variabil'rty when analyte concentr�tions are within five times the quantitation 6mit. D-Data from 1: dilution. E-The value reported exceeds the quantitation range;and is an estimate. F-Surrogate recovery data is not available due to the high concentration of.coeluting target compounds. . G-Insuffiaent sample quantity for duplicate anatysis. - H-The analyte ind'icated is a common laboratory solveM and may have been introduced during sample preparation, and be impacting the sample result. t-Compound recovery is outside of the control limifs. J-The value reported was below the practical quantitation limit. The value is an estimate. K-Sample duplicate RPD is outside confrol limits due to sample inhomogeniety. The sample was � re-extracted and re-analyzed with similar results. L-The RPD is outside of the control limits. M-Hydrocarbons in the gasoline range(toluene-napthalene)are present in the sample. O-Hydrocarbons outside the defined gasoline range are present in the sample; NWTPH-Dx recommended. P-The RPD of the detected c�ncentrations between the twa columns is greater than 40. Q-Surrogate recovery is outside of the control limits. _ S-Surrogate recovery data is not available due to the necessary dilution of the sample. T-The sampte chromatogram is not similar to a typical U-The analyte was analyzed for,but was not detected above the reported sample quantitation limit. V-Matrix SpikelMatrix Spike Dup{icate recoveries are outside control limits due to matrix effects. W-Matrix Spike/Nlatrix Spike DupCcate RPD are outside control limits due to mafrix effects. X-Sampte extract treated with a silica gel cleanup procedure. Y-Sample extract treated with an aad cleanup procedure. . Z- ND-Not Detected at PQL � MRL-Method Reporting Limit . PQL-Practical Quantitation Limit � RPD-Relative Percent Difference _ , I, � �6�� C��I� O� C�S�O�y Page � of ��.... � , _ ' ��,� OnSite ��`'':��`:'�, Environmentai Inc. � t Q � • Project Chemist: / 14646 NE 95th Street . Laborator NO. Redmond,WA 98052 � 0 y � �. '"� � Q Fax:(425)885-4603 . Phone:(425)883-3881 (CheCk One) - - . - : :� , company: ❑ Same Day ❑ 1 Day L S 1�"A C7.�41-�"'T' ❑ 2 Day �g pay m ProJect No.: �� ' ��Z.� ❑ Standard o (Hydrocarbon analyses:5 days, � � r;,. Prolecc Name: All other analyses:7 days) � m � ^� C0 , �7�= h�� C��1Z,�c, �( � � o co ProJect Maneger: ❑ � pe� p � � > � � c� � � ��'! o.t`� ��S ��,c��,,, �her) `' = c� o .�' m �°--� � `� � � m i, a a n=. � pd� Q �' �' ;o � � � r O y . � r �- � .� � m U ,O ' '� ' ¢ . V � o U a d � I , , ., � ., � z Z Z > x cn a a � ' 1-,►� � ` � , r � I- H > w o 1 � I l�z.. y ; ,� ��;1 }-�,� ' � ��'`i ;3 � 2 ,.� (_ �,.L " x 4f - z v� ' �z- s' , S- H 1 '-- / '/z.' 8' I Z �r' _ � � ��Z ;2� � - c 'I2�2. ' �• S , " �1 ' . �/Z. Q; U . " /'/ � �- � g;s 2. U � ` �/z, ��q �� - G� r �/`j„� !� �,, �" -f Y l z'S'' ;2� REL p S ED Y DAT RECEI ECf Y ,.� DATE COMM ` ENTS: � z� . � r 0 � � FIRM �/ �� A � TIME . FIRM TI E �"' � C t /� //•. � RELINQUISHED BY DATE RECEIVED BY DATE � FIRM : TIME FIRM TIME REVIEWED BY DATE REVIEWED 'I Chromatographs with final report❑ , DISTRIBUTtON LE�END: White-OnSke Copy Yellow•Report Copy Pink-Cllent Copy , � . �... �� x� � � � �� Pa e � of � , ,, , ��`�1131te y g ___�a_ �`� ��'��`� Environmentai lnc. � � � � � � '•• - Project Chemist: y � � � � � � 14646 NE 95th Street • Redmond,WA 98052 � ' '• � Laborator NO. Fax:(425)885-4603 • Phone;(425)683-3881 (Check One) - - . - . - � , Company: ❑ Same Day ❑ 1 Day i (.� � /`t Q�p� ❑ 2 DaY 3 Day m ProJect No.: � � ��Q�.,.. �, Z�t.� ❑ Standard � ProJect Neme: (Hydrocarbon analyses:5 days, � � � � �n�. /,� �Rp�_ ! All other analyses:7 days) � o a � tO i° �J /v N Project Manager. � /X�a.n cr c.t,,cy..�,�'4.,w,�!/t� � p~p x � >-p � � � � � y � '�V 1 r��\C�� w,«..�c"L r,��'�,,,,. . (bt,, r) /G✓..� S � � d � "" r' � � r�„ 2 2 S a� a�i � .�' �� v U � � , � � � � � rn .E = m � � y I I � � � ft� J � _ _ � 1 1 1 1 ' 1 : 1•' I � .Z Z Z � _ � d Q. � �- � W � `�f� �.,./I / �y , (� \ .rn� /'� (I�r � �'2!� t'l. �'�f...3 'R..,�'J.3( j p� O �� " — �' ~S'��. 9sK�., /-� - 8 -- '�2 �.�� ' "'��Z- :.SS"� � � " _ I l'Z.. /�?:a Z � S` - � -- '��.. �,��g . � � � , - � �.�.. :� RELI &,1,�11 D B � DA7E REC V D BY � �. DA `„ COMMENTS: � �.s o � �� FIRM TIME � FIR � / �' I ►� �, �" �' r TIME�t �,,�f� �a.,, C.+ ` � �61 � �� J��`JIJA+'1^� i �� RELINQUISHED BY D TE RECEtVED BY DATE �?�, ' FIRM TIME FIRM TIME �'• - AEVIEWED BY DATE REVIEWED , Chromatographs with final report C] DISTRIBUTION LEGEND: WhRe-OnSite Copy Yeliow-Report Copy Pink-Clfent Copy 7.0 BASIN AND COMMUIVITY PLAN AREAS See attached maps. 7535.009[DED/mm] � W � � Q � � . � � � r � - , i.. .� Z Z z . * ,.� .., ., , . � r., � Z � i `�'1,� ,�,h:._ .� 1 .l''^''1?''�'i' O � �� . � �N /,�, .11"4�"�''� 1/ J � � 1•• U .e ,�1•' ,f.+' �p�/ ,r , U.� gr, e � .�... p ,; , , , ,; �,, a i '�•,,. ,,I� ,'j F� � ,��'�� .� (� Y � � � i - --�:.:�T �� ~: �•`> f�+ Z � . j, \ ` �� _. � . , �� `, �'"" ` . _ ,, ' �,,�',�;�►� '' llr �C Z < � �1,. �.1.. -�,, II•� ,� �i� r' ' � II. .`'� � � � 'il � � ��i�' ,i•j �'e'�.� �C j ��l � i 1 > � � i I . � ��a,�1 !1 � � ''�. � �. ,r �! `�, , �;, 11 � '' l ! 1 � '� � � I 1� ��... 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" -- ' : `�� i'� ^�� + ' �/.. • � .� _ �� •�.� -'� � • • C'� .2�f _ �G 7a.a -y _ ._.. � n'9�n"1 ` ��{='`'", ` ��t :_ - . i • rka,.wanCi.+ � _� ..i - i _ � •�•.. . .� M"°` Y�'�/1� - _ �- ` ._ � ii — ' �c.. _i7 _ ;�%F. . � ;� ` i �r '� �. t G� `1. /{ � - � -. •, `' ! �• . �` '\ �. i ti � ,L � �r ti ,`�� . .� � ' . � s� ��-\�� -1��• • �' ._�� \. t•. ��.. ` I `JW�fir U� _ / �.✓� _ I . . � �J�� !t ,�'� j � �' 1y��1 . � . ��._ � .� ' �1`y��N G �•��. - � ~•2;' � '�^ � _ 1 ;� �.. _ 1 �'.�.. / 1 - `'= ON IYYw 4 y � �,/� �� ` SaR1�Fak .� - \'�. a �,d,`` -�� ; -``�j � ? ` Hwr �� t�pD� (�i``�1 � .` �o�fqrripwr � . `�'i � Figure 2 i � - �;- � � -.� � '.�-_•�, � ;; ��a = . ;. r,,,�_� -_--T-4�`- - -;:;:: - - -,,:- .� `� �'' , i s� ��'`i.=� — '��a ~�f,;:-" t� " DRAINAGE BASINS� _• ` v {: , ti�y'� r s u•ia.t `. ♦ > � i o�ef f 1 '. - _ t � �' ��. ' "'- ��`� � 111R ," • �` � KIII�COUI1t�I ,—. ��..�DRAlNAG - : . � �,�.�,rn ,n��o . --�. -• ,� " - ` _ �-` _ ,-,_ '.�� ' ._' � �.,+ �;2 �� ._ '.�, i� ';�� T. • ( - `�=- � - ' �_,. � - . '::� — ,� _- 1 � _ f=� f` -,y ,% ,_ � �_�' r �� - .: , .,. � � .;`��►... .�. � ! \~ ~�•- � 1 b �7 ro� �, Z�~ � ,\4 . . _.-- - - � - '-- ., ` . � _,, .Q� ._ '—. -��.;._- .-��_,:,�„ .��.. Major Basin Boundary �TACOIM . I �..f . � , /�N'1 �'• , v. -�_.�' - '� . . - , \ • .,� � �� -' � � ` "°^� � �t ��.Y�---- . �a _ . " ' Sub-Basin Boundary � � �- - - ---- �, � � _� �r , , . _' _ -_-� r� `l l,, ' i �.� � w..�. �i �i- � •'' . � �' � -��„ �� _i _ , , �;: .� f- ' � Source: Kinp Covnty Sensitiw Aross ',• __ �^��_ � •%;�` _,r= — _�. � �� .. — MspFolio,WetlandsSupplement y ",j � � � '" ''-`: 1 � ,. --..,,, �tt.•»s.+ :J orr w r�nor►w.isns�rto '`t- "s�• J .,�-.. .-� - �. �� -- � ---.. ��t_�. � �.• �t . �'i. -- - �- F ,�i �.,.,. ` �.` � " �`�. __ ,� .�.�.�.,. � � '� - �, ,, _ �f� ,� - �� .;, • �v BAS� � _ ;:- � 'f � - � ,�~� _f 6"��-^C�i �'b'•. .'�-�. _ 'i� ( ,� .t - :, `� � _ -� . � �; ` / �'� 'r•.'-- ,�'��.�._ �,.�� f �.'�` y . '.\ �_....�` _ O I 2 3 4 S 6 7 B Mlles '�� `,' / � 1:300,000 • 8.0 OTHER PERI�llTS At this time,the permits anticipated ior tlus pr��ject �u-e a: follo��: • Roadway and DrainaRe C�nstructi��it • Gradin�Pern�it 7535.009[DED/mm] 1 9.0 EROSION/SEDIMENTATION CONTROL DE5IGN The limits of clearing have been shown on the construction plans to encompass the entire site area. Silt fences have been shown on the plans to protect the adjacent properties from any possible sediment runoff. Since the site is only approximately 3.4 acres in size, and currently infiltrates all on-site stormwater, we do not feal that it is necessary to provide any form of sediment traps ar ponds. As construction progresses, silt fences will be maintained, and catch basin protection will be installed to ensure that all stormwater leaving the site is clean and free of sediment. Once the underground wet vault is installed, it will act as a sediment trap, which will ensure that not sediment laden water will leave the site. 7535.009[DED/mm] 10.0 ADDITIONAL DOCLTMENTS � 7�3�,nU��I�LD!ciin�J � > �!_; . .- �'' ' . � _ -. .. 3 � ".� �ST��A 1 �ix�i �;.r.� . .. _ � , .. .. __.` ...,��: . ��.�_� � . �, _ , _ . � � :� � � � ; i i, } , `z ' 10.1 Retention/Detention Facility Summary Sheet and Sketch Ki �i„�;_ COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL RETENTI�N/DETENTION SUMMARY SHEET � , Development �� S `��`�Q�� Date b� lg -b J Location Zy"�p 8�,�- p� N� Z�� `��£�' ENGINEER DEVELOPER Name �� Name �K- �lW� Firm ��ffkt�s� �G�7f*S�cfLS Frm V'(l� �61�1it.fiS Address (g2�s �2-�`�D �1� s Address � � l � � ��`f� IIfU �'r trs74 [�D3 Z 8�.1.1,�.0 u� c� `� Phone '�S� Z5f- b22Z Phone �'?� -b�- b�v� � • Developed Site 3 '� acres Number of Lots � • Number of Deteniion Facilities On Site • Detention provided in regional tacility � Regional Facility bcation • No detention required 0 Acceptable receiving waters - • Downstream Drainage Basins � � Immediate Major Basin BasinA N/� �N�I�T�'rjb7� ; � —� Basin B - Basin C Basin D TOTAL INDIVIDUAL BASfN Drainage Basin(s) ( A B C D Onsite Area �' � � 4ffsite Area 11 'g - - Type of Storage Facirty �N� Live Storage Volume �g $2� � Predeveloped Runofl Rate 2 year 10 year � Postdeveloped Runoff Rate 100�year � 2 year 10 year � Developed Q 100 year � Type of Restriction � � � Size of Orifice/Restriction �� _ ` Orifice/Restriction No.1 - -� -�- � �� f� No2 No.3 ; No.4 � No.S