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ADDRESS SERVICE REQUESTED as7 A. , ' * - - ' ,...., ." 7158401 °-g• PO * PRSRT-FIRST401..IES-SE.A -NA SE-1 tit-rA no -. .. , t NI\\ King County .) n *I V'cv THIS IS A BLESS o L,4_,, aiG Ikifk MUST I'',IC-Liii.;E 05 0 Fourth Avenue M I OR Seattle, WA 98104 SUITE II4SEER AI E ,-,`--.--,; 1 If43I1FFICIENT ,....:. ' ,,,,,60 ' CO' \C:: \- ---- :- PiGgl Milt-TO REGEN r . DELBLER_ .. Ily -- A t.:_RESS I RE-z:Ril TO SEN1.: c ,. '' ,2.442,4%-wvs-grAscr$2,.. Ililiiiii11111.111111.111,1.111.1111iiIliii111.111,1111,111111 ,!e, 1 R ''- ; CITY OF RENTON • fi Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator June 29, 2000 TO: Parties of Record SUBJECT: Sunnydale Storm System Replacement Project No. LUA-00-071,ECF Dear Resident: This letter is written on behalf of the Environmental Review Committee (ERC) and is to advise you that they have completed their review of the subject project. The ERC, on June 27, 2000, issued a threshold Determination of Non-Significance-Mitigated with Mitigation Measures. See the enclosed Mitigation Measures document. Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8-11 B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430-6510. The preceding information will assist you in planning for implementation of your project and enable you to exercise your appeal rights more fully, if you choose to do so. If.you have any questions or desire clarification of the above, please call me at(425)430-7270. For the Environmental Review Committee, 724,6i 5 Lesley Nishihira Project Manager cc: Mr. Bryan Heath/Owner King County/Owners LaPianta LLC/Owners Enclosure nNSMI FTTFR 1055 South Grady Way-Renton, Washington 98055 CITY OF RENTON DETERMINATION OF NON-SIGNIFICANCE • (MITIGATED) MITIGATION MEASURES • APPLICATION NO(S): LUA-00-071,ECF APPLICANT: City of Renton/Surface Water Utility Division PROJECT NAME: Sunnydale Downstream Storm System Replacement Project DESCRIPTION OF PROPOSAL: The City of Renton is requesting Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace 700 feet of existing 18-inch corrugated metal storm pipe with new 18-inch high-density polyethylene pipe (HDPE). In addition to Environmental (SEPA) Review, the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet of the ordinary high water mark of a creek. LOCATION OF PROPOSAL: Southwest of Sunnydale Mobile Home Park; North of SE 5th • Street MITIGATION MEASURES: 1. The project shall comply with the recommendations contained within the Geotechnical Report prepared by Zipper Zeman Associates, Inc. dated.May 10, 2000. • • mitmeasures : • •• ,...... . 0 CITY OF RENTON . ., - • • , NAL Planning/Building/Public Works \ ,., rzl - 4t -1 . o 4) JU$ 0700 - 0 3 0 1055 South Grady Way - Renton Washington 98055 C to' % . ... , i. tst er _. PB MITER ADDRESS SERVICE REQUESF 758401 U.S. POSTAGE 4, THIS IS A BUSINESS Eilki [MP - - 1- il;. uu Op FCMIRESDRIED SEA IAA 981 IML MUST hk6CLUDE A , . ! G„ SUITE MAIDER AND/GR f,,, 0-1:1;::; RM 'fikiE •, c<, Cr, FI INTO Er"- IVE DELIVERY ' P v-.11-- • 0 ° <'‘ •,—.7,2,1 .,„,•, ® King County . 500 - 4th Avenue ,---.,, Seattle, WA 98104 ( -) ._,..., 9105Crs... '....r3 0 Off ., • • INSUFFICIENT e-7--r--.-_, - ADOflESS • , z o, . • • RETURN TO SENDER n) Nd r,')/, . • • • • 1 ' ..... , '--,:, :\itsivi, seezys•s/112.1-eA. . 1111.111,411mililidiliiillnailitilisil,11111111,11,11111 7 - „` CITY OF RENTON ..LL r1 Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator June 7, 2000 Allen Quynn City of Renton Utility Systems Division 1055 South Grady Way Renton, WA 98055 • SUBJECT: Sunnydale Storm System Replacement LUA-00-071,ECF,V-H Dear Allen: The Development Planning Section of the City of Renton has determined that the subject application is complete according to submittal requirements and, therefore, is accepted for review. It is tentatively scheduled for consideration by the Environmental Review Committee on June 27, 2000. Prior to that review, you will be notified if any additional information is required to continue processing your application. A public hearing will be held by the Renton Hearing'Examiner at his regular meeting in the Council Chambers on the seventh floor of City Hall. On July 25, 2000 at 9:00 AM to consider the Variance. The applicant or representative of the applicant is required to be present at the public hearing. Please contact me, at (425) 430-7270, if you have any questions. • Sincerely, /1•6//4/69 Lesley Nishihira Project Manager cc: LaPinata LLC/King County/Bryan Heath/Property owners _capt• 1055 South Grady Way-Renton, Washington 98055 �a_.. . . -___. -- -.- -. �/'� ®09L5 aasel siagei ssaappd ®All3AH Sil 512690005503 ' ; I512690005008 162305901801 BEAL DAVID M+TERRI L , CARLSON CARRENIA JO+JOHN L : CITY OF RENTON 26018 SE 38TH CT 24322 147TH AV S E ' FINANCE ' ISSAQUAH WA 98027 , KENT WA 98042 , ! 200 MILL AVE S ) „ ! RENTON WA 98055 J 162305904904 ' 512690006006 ' 512690004001 CITY OF RENTON ' DEADY TROY LEE DOBSON JOHN W ESTATE BENNETT W E ' 3436 SE FIFTH ST • DOBSON WYMAN K P R 200 MILL AVE S ' RENTON WA 98055 PO BOX 59 RENTON WA 98055 ( RENTON WA 98057 512690006501 162305900308 , 512690004506 GOMES SAMUEL E+WISSLER COLL KING COUNTY LEISE RONALD E+GERALYNN M 2222 SAHALEE DR E 500A K C ADMIN BLDG 3412 SE 5TH ST REDMOND WA 98053 500 FOURTH RENTON WA 98058 f SEATTLE WA 98104 1 „ t 512690007004 • 512690003003 512690003508 NELSEN KAREN NELSON E SUZANNE+DARRYL R : STREIFEL JOHN J+MARION 0 3500 SE 5TH ST ' 3332 SE 5TH ST 3340 SE 5TH ST RENTON WA 98058 RENTON WA 98058 RENTON WA 98055 ' 162305902205 162305904805 WEST COAST MGMT INC ' LA PIANTA,LLC SUNNYDALE MOBILE HOME PARK 1 PO BOX 88028 5339 PROSPECT RD#261 TUKWILA,WA 98138 SAN JOSE CA 95129 r • , , li , I I N . ' ) I ' r- S 086V OINN2I TIIIN 00Z ' M.LL3NN1H .L au 30 AM I ' t 6170650£Z9I — 55086 M NLN�2I 'c - �- S any IJA OOZ 1 . ; ' aDNVNI3 I ' N N 3O ADD ' ' , . 10810650£Z91 ; ., --� eons Joj aieidwai asn I As1aays paaj wows • CIT' F' RENTON • Hearing Examiner Jesse Tanner,Mayor Fred J.Kaufman • OEVELGPh,.1t i.?P;, \\'IP! October 31,2000 OCT 3 q 2000 : Nicola Robinson 3110 SE 5th Renton,WA 98058-2824 Re: . APPEAL OF DNS-M FOR SUNNYDALE STORM SYSTEM REPLACEMENT FILE NO. LUA00-098,AAD Dear Ms.Robinson: The Examiner's Report and Decision on the above referenced matter,which was issued on October 16, 2000,was not appealed within the 147day period established,by ordinance. Therefore,this matter is considered final by this office and the file on your;appeal is being transmitted to the City Clerk as of this date. Please feel free to contact this office if further assistance or information is required. Sincerely, —1-14 AV, Fred J.KaufmaU Hearing Examiner FJK/jt cc: •Leslie Nishihira ' Sandi Seeger,Development Services • 1055 South Grady Way- Renton, Washington 98055 -.(425)430-6515 5 PrNDI S • i',October 16,2000 OFFICE OF THE HEARING EXAMINER CITY OF RENTON ®e/ '� i<jG t REPORT AND DECISION <.)1 APPELLANT: Nicola Robinson Appeal of DNS-M for Sunnydale Storm System Replacement File No.: LUA00-098,AAD LOCATION: SW of Sunnydale Mobile Home Park,North of SE 5th SUMMARY OF APPEAL: Appeals DNS-M and requests further study of the impact to existing stream and wetland PUBLIC HEARING: After reviewing the Appellant's written request for a hearing and examining the available information on file,the Examiner conducted a public hearing on the subject as follows: MINUTES The following minutes are a summary of the August 29,2000 hearing. The official record is recorded on tape. The hearing opened on Tuesday,August 29, 2000, at 9:00 a.m. in the Council Chambers on the seventh floor of the Renton City Hall. Parties wishing to testify were affirmed by the Examiner. The following exhibits were entered into the record: Exhibit No. 1: Yellow file containing the appeal, Exhibit No.2: Exhibit No.2: Yellow file No. proof of posting and publication, and other LUA00-071,ECF containing the original application, documentation pertinent to the appeal. proof of posting,proof of publication and other documentation pertinent to this request(by reference) Exhibit No.3: Ms. Robinson's written comments Exhibit No.4: Declaration of Allen Quynn Exhibit No.5: Site map(A&B) Exhibit No. 6: Vicinity map Parties present: Nicola Robinson, appellant 3110 SE 5th Renton, WA 98058-2824 Representing City of Renton Russ Wilson,City Attorney Leslie Nishihira,Development Services Allen Quynn 1055 S Grady Way Renton, WA 98055 • Nicola Robinson Appeal of DNS-M for Sunnydale Storm System Replacement File No.: LUA00-098,AAD October 16, 2000 Page 2 The Examiner explained that the appeal was an administrative appeal held pursuant to Ordinance 3071 and was the only administrative review to occur on the matter. The matter may be submitted back to the Examiner for reconsideration if the parties are not satisfied with the decision. He stated that the appellant had the burden of demonstrating that the City's action was erroneous,and would have to show clear and convincing evidence that the City's determination was incorrect. At that point the City could respond, if they chose to do so. As a preliminary matter,the City Attorney moved to have the appeal dismissed for lack of standing on the appellant's part, and stated the appellant failed to allege any specific harm that the replacement system would cause. The Examiner overruled the motion and allowed the appeal to go forward. Ms.Robinson stated that a matter of concern was the wetland located to the north of a stream which runs parallel to the existing pipe. In the past 10 years there has been flooding of the stream. With the increased flow from the new pipe,there may be increased flooding and potential degradation of the wetland. She also stated the latter portion of the pipe cuts across a path which the neighborhood has been using for several years. A further concern was the release of sedimentation into the stream and potentially the wetland. It was her understanding that the Sunnydale treatment facility was not up to the current standards. She also stated that wildlife habitat was not addressed in the SEPA review. Even though the City is not in a position to treat the existing stream in any other way than a conveyance of storm water,Ms.Robinson was concerned when a project is passed without considering the natural environment. She would like to see the pipe moved to another location that would not impact this stream and wetland in the way proposed. She referred to Department of Ecology's storm water manual that states "streams are not to be used as a means of conveyance for storm water run-off." Mr. Wilson stated that the vested rights doctrine applies to these types of projects and their SEPA review. The system does not have to meet current codes,but only those that were in place at the time it was installed. The record must demonstrate that environmental factors were adequately considered in a manner sufficient to establish prima facie compliance with SEPA. The City studied all codes involved,and a geotech study was also completed on the project.The pipe has been leaking for a number of years,but the system's volume is not increasing from when it was originally installed. Ms.Nishihira testified that the new pipeline course was designed to avoid a stream crossing and was determined to be less of an impact to existing slopes. Mr. Quynn explained the current stream and pipeline course, and the proposed pipeline course. The proposal is not a maintenance project,but in fact the pipe is going to be realigned approximately 100 feet south of its location to avoid impacts to the stream. The flow from the pipe was analyzed using the 25 and 100 year storms, and the pipe was sized to handle the capacity. He described the dissipator at the end of the pipe and its purpose. He further described the actual layout of the pipe and the proposed method of installation. Mr. Quynn clarified that the City used the standards set forth in the King County Storm Water Management Manual. On cross-examination,Mr. Quynn responded that the existing pond at the mobile home park was used only by the mobile home park. Nicola Robinson • Appeal of DNS-M for Sunnydale Storm System Replacement File No.: LUA00-098,AAD October 16, 2000 Page 3 In her closing argument,Ms. Robinson reiterated the Puget Sound Basin's standard that using streams and wetlands as a conveyance of storm water is prohibited under state and federal law. The SEPA review indicates no measures are necessary to decrease aesthetic impacts,but if you live in the neighborhood and enjoy walks in the area,the proposal is considered unsightly. Mr.Wilson concluded that the appellant's case was based on wanting the pipeline moved out of her backyard, and not whether the ERC had done a thorough review. The ERC did in fact review the project and the proposal actually lessened the impact to the environment. The Examiner called for further testimony regarding this appeal. There was no one else wishing to speak. The hearing closed at 10:05 a.m. FINDINGS,CONCLUSIONS &DECISION Having reviewed the record in this matter,the Examiner now makes and enters the following: FINDINGS: 1. The appellant,Nicola Robinson,filed an appeal of a Determination of Non-Significance-Mitigated (DNS-M) issued for a proposed replacement of the Sunnydale Storm System. 2. The City, in the course of, and as a result of its SEPA review, issued a Declaration or Determination of Non-Significance for the project. The Declaration of Non-Significance(DNS)was conditioned by the City in what is known as a mitigation process, and became a DNS-M,the "M" alerting readers to the fact that mitigating measures were attached to the project. 3. The condition imposed by the ERC required compliance with the recommendations found the Geotechnical Report prepared for the project. 4. The appeal was filed in a timely manner. The appellant lives in the Maplewood Community. That community is near the pipeline and the creek it empties into. The appellant apparently walks along a trail that the new pipeline will transect. 5. The action is a City-sponsored action to replace a damaged storm water line. That line drops down from the plateau north of Maple Valley near the Sunnydale Mobile Home near Union Avenue NE and NE 2nd and terminates near SE 5th Street near the Maplewood community. The existing line serves the mobile home park. From the record it appears that the original line was constructed sometime after 1985 or 1986. 6. The appellant's letter of appeal raised issues regarding the affects of the reconstruction on a stream and wetland and wildlife in the Resource Conservation area in which the pipe would be located. Also the appellant raises the fact that the Sunnydale Trailer Park's treatment facility and detention pond do not meet current treatment or water quality guidelines, are undersized and that beneficial uses are impaired and threatened by these issues. The appellant also noted that neither the creek nor the wetland are Nicola Robinson • Appeal of DNS-M for Sunnydale Storm System Replacement File No.: LUA00-098,AAD October 16,2000 Page 4 properly inventoried and may have been overlooked by the ERC in its environmental review. She also noted that streams are not to be used as a means of conveyance for storm water run-off. The appellant also noted that the current pipe is damaged and probably does not carry the "normal" quantity water and pollutants down to the creek but once repaired,water and pollutant load will be increased. 7. While the project has been termed a"replacement" of a damaged stormwater drainage pipe,the pipe will be relocated outside of the existing alignment in some locations. The record reveals that the reconstructed line will diverge from the current alignment and realigned approximately 100 feet south of its current location. This new alignment was meant to avoid impacts to the stream and to avoid crossing the stream and to lessen the impacts on the steeper slopes. There will be a dissipator at the end of the pipe. The dissipator will be flush with the ground and not be the "typical" above ground birdcage. There will be approximately 150 feet of excavation for the new alignment. Rockery supporting structures will be rebuilt. Some existing access manholes and the damaged pipe will be removed manually to lessen impacts on the slope and vegetation. 8. The appellant noted that the creek has flooded a number of times over the last ten years. The appellant speculates that repairing the pipe so that it conveys all of the stormwater will probably direct more storm water into the pipe and worsen flooding conditions. 9. The appellant seeks either a fuller environmental review or a relocation of the pipe to avoid creating impacts on the stream and wetland. 10. The new 18" (eighteen inch)pipe will cross an existing social trail and probably create an impasse to walking on the trail. 11. The pipeline traverses slopes that range up to near vertical. CONCLUSIONS: 1. The decision of the governmental agency acting as the responsible official is entitled to substantial weight. Therefore,the determination of the Environmental Review Committee(ERC),the city's responsible official, is entitled to be maintained unless the appellant clearly demonstrates that the determination was in error. 2. The Determination of Non-Significance in this case is entitled to substantial weight and will not be reversed or modified unless it can be found that the decision is "clearly erroneous." (Hayden v.Port Townsend, 93 Wn 2nd 870, 880; 1980). The court in citing Norway Hill Preservation and Protection Association v.King County Council, 87 Wn 2d 267,274; 1976, stated: "A finding is'clearly erroneous' when although there is evidence to support it,the reviewing court on the entire evidence is left with the definite and firm conviction that a mistake has been committed." Therefore,the determination of the ERC will not be modified or reversed if it can meet the above test. For reasons enumerated below,the decision of the ERC is modified. Nicola Robinson • Appeal of DNS-M for Sunnydale Storm System Replacement File No.:LUA00-098,AAD October 16, 2000 Page 5 3. The clearly erroneous test has generally been applied when an action results in a DNS,since the test is less demanding on the appellant. The reason is that SEPA requires a thorough examination of the environmental consequences of an action. The courts have,therefore,made it easier to reverse a DNS. A second test,the "arbitrary and capricious"test is generally applied when a determination of significance(DS) is issued. In this second test an appellant would have to show that the decision clearly flies in the face of reason since a DS is more protective of the environment since it results in the preparation of a full disclosure document, an Environmental Impact Statement. 4. An action is determined to have a significant adverse impact on the quality of the environment if more than a moderate impact on the quality of the environment is a reasonable probability. (Norway, at 278). Since the Court spoke in Norway,WAC 197-11-794 has been adopted, it defines "significant" as follows: Significant. (1) "Significant" as used in SEPA means a reasonable likelihood of more than a moderate adverse impact on environmental quality. (2) Significance involves context and intensity...Intensity depends on the magnitude and duration of an impact....The severity of the impact should be weighed along with the likelihood of its occurrence. An impact may be significant if its chance of occurrence is not great, but the resulting environmental impact would be severe if it occurred. 5. Also redefined since the Norway decision was the term "probable." Probable. "Probable"means likely or reasonably likely to occur, ...Probable is used to distinguish likely impacts from those that merely have a possibility of occurring,but are remote or speculative. (WAC 197-11-782). 6. Impacts also include reasonably related and foreseeable direct and indirect impacts including short- term and long-term effects. (WAC 197-11-060(4)(c)). Impacts include those effects resulting from growth caused by a proposal, as well as the likelihood that the present proposal will serve as precedent for future actions. (WAC 197-11-060(4)(d)). 7. Environmental impact is also related to the location. A development whether an office building or a single family development may or may not create impact depending on the existing surroundings. 8. In the main,the proposal replaces a damaged storm water pipe that already serves the same detention system and empties into the same creek drainage system. While there will be realignment the impacts of the entire project do not appear such that it will have more than a moderate impact on the environment. The new alignment avoids some of the steeper slopes and avoids an unnecessary crossing of the creek. The new dissipator structure will be less visually intrusive. Twenty-five and 100-year storm calculations have been factored into the project. 9. The only cause for concern is that the new pipe will create an approximately eighteen inch(18")barrier to an existing trail that allows residents to enjoy the creek,wetlands and forest environment. The • Nicola Robinson Appeal of DNS-M for Sunnydale Storm System Replacement File No.: LUA00-098,AAD October 16, 2000 Page 6 barrier appears to deserve mitigation and the applicant shall provide a method that allows pedestrians to cross over the pipeline and continue to use the existing trail. 10. The determination of the Environmental Review Committee is modified to add an additional mitigation measure. DECISION: The decision of the Environmental Review Committee is modified to contain an additional mitigation measure: 1. The applicant shall provide a method that allows pedestrians to cross over the pipeline and continue to use the existing trail. ORDERED THIS 16th day of October,2000. FRED J. KAU N HEARING E INER TRANSMITTED THIS 16th day of October,2000 to the parties of record: Nicola Robinson Russell Wilson Leslie Nishihira 3110 SE 5th 1055 S Grady Way 1055 S Grady Way Renton,WA 98058-2824 Renton, WA 98055 Renton, WA 98055 Allen Quynn John C. Ramsey Neal Whitney 1055 S Grady Way 3517 SE 5th 3532 SE 5th Renton,WA 98055 Renton, WA 98058 Renton, WA 98058 James 3324 SE 5th Renton,WA 98058 Nicola Robinson Appeal of DNS-M for Sunnydale Storm System Replacement File No.:LUA00-098,AAD October 16, 2000 Page 7 TRANSMITTED THIS 16th of October, 2000 to the following: Mayor Jesse Tanner Gregg Zimmerman,Plan/Bldg/PW Admin. Members,Renton Planning Commission Jana Hanson,Development Services Director Chuck Duffy,Fire Marshal Lawrence J. Warren, City Attorney Transportation Systems Division Jay Covington, Chief Administrative Officer Utilities System Division Councilperson Kathy Keolker-Wheeler Sue Carlson,Econ.Dev.Administrator Betty Nokes,Economic Development Director South County Journal Larry Meckling,Building Official Pursuant to Title IV, Chapter 8, Section 15 of the City's Code, request for reconsideration must be filed in writing on or before 5:00 p.m., October 30,2000. Any aggrieved person feeling that the decision of the Examiner is ambiguous or based on erroneous procedure, errors of law or fact, error in judgment, or the discovery of new evidence which could not be reasonably available at the prior hearing may make a written request for a review by the Examiner within fourteen (14) days from the date of the Examiner's decision. This request shall set forth the specific ambiguities or errors discovered by such appellant, and the Examiner may, after review of the record,take further action as he deems proper. An appeal to the City Council is governed by Title IV,Chapter 8, Section 16,which requires that such appeal be filed with the City Clerk, accompanying a filing fee of$75.00 and meeting other specified requirements. Copies of this ordinance are available for inspection or purchase in the Finance Department, first floor of City Hall. If the Examiner's Recommendation or Decision contains the requirement for Restrictive Covenants,the executed Covenants will be required prior to approval by City Council or final processing of the file. You may contact this office for information on formatting covenants. The Appearance of Fairness Doctrine provides that no ex parte(private one-on-one)communications may occur concerning pending land use decisions. This means that parties to a land use decision may not communicate in private with any decision-maker concerning the proposal. Decision-makers in the land use process include both the Hearing Examiner and members of the City Council. All communications concerning the proposal must be made in public. This public communication permits all interested parties to know the contentsof 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. The Doctrine applies not only to the initial public hearing but to all Requests for Reconsideration as well as Appeals to the City Council. • CITY OF RENTON OFFICE OF THE HEARING EXAMINER IN THE MATTER OF THE APPEAL ) OF A DNS-M FOR SUNNYDALE STORM SYSTEM ) DECLARATION OF REPLACEMENT-FILE NO LUA-00-098, AAD ) ALLEN QUYNN ) ) ) Allen Quynn hereby declares under penalty of perjury, pursuant to the laws of the State of Washington that the following is true and correct: 1. I am a civil engineer for the City of Renton. 2. I graduated from the University of Washington with a Bachelor of Science degree in oceanography in June of 1987. 3. I graduated from Washington State University with a Bachelor of Science degree-in Civil Engineering in December of 1993. 4. I am currently the service water utility projects manager for the City of Renton. 5. I am in charge of the project commonly known as the sunnydale storm system replacement project, file#LUA-00-098, AAD. 6. Attached hereto as exhibit A is a true and correct copy of the Master Application submitted to the Environmental Review Committee for the sunnydale project. 7. Attached hereto as exhibit B is a true and correct copy of the environmental checklist submitted to the Environmental Review Committee for the sunnydale project. Attached to that checklist is a true and correct copy of the geotechnical report referred to in the committee's mitigation requirement's. 8. Attached hereto as exhibit C is a true and correct copy of the project narrative submitted.to the Environmental Review Committee for the sunnydale project. 9. These are the documents relied upon by the City of Renton in there request for a determination of non-significance. E . A 10. This request was made pursuant to the requirements of RCW 43.21C.030(2)(c). 11. Attached hereto as exhibit D is a true and correct copy of portions of the King County Washington Surface Water design Manual. 12. This manual is the controlling authority for the sunnydale project. 13. Attached hereto as exhibit E is a true and correct copy of the definition of an impervious surface as defined by the stormwater management manual for the puget sound basin. 14. The sunnydale project does not involve the installation of any impervious surfaces. 15. The sunnydale project does not require the installation of any filtration system. 16 Attached hereto as exhibit F is a true and correct copy of determination of non significance-mitigated issued by the Environmental Review Committee. Dated this 281 day of August, 2000. ,6-04,A / Allen Quynn 111. CITY OF RENTON CERTIFICATE OF EXEMPTION FROM CRITICAL AREAS REGULATIONS August 28, 2000 LAND USE FILE NO.: LUA-00-071, ECF PROJECT NAME: Sunnydale Storm System Replacement Project OWNER/APPLICANT: City of Renton; Storm Water Utilities PROJECT MANAGER: Lesley Nishihira (x7270)/Allen Quynn (x7247) PROPOSAL: The City of Renton has requested a letter of exemption for the replacement of the Sunnydale downstream storm system from the Critical Areas Regulations under RMC 4-3-050.C.d.4. The proposal is to replace 700 feet of existing 18-inch corrugated metal storm pipe with new 18-inch high- density polyethylene pipe (HDPE). The existing pipe is buried for 160 feet at the top of a slope, with the remainder of the pipe constructed above ground downward of the slope. Presently, the upper 60 feet of the pipe is partially crushed and has resulted in joint separation, subsequent water leakage and reduction in the conveyance capacity of the pipe. In addition, one of the two manhole structures on the slope has been undermined and is in danger of collapsing. The project would include the removal of the existing pipe and associated structures. The new pipe would be buried in the existing trench at the top and would follow an improved above ground alignment to the bottom of the slope. The new pipe would have no intermediate structure and would also have an energy dissipator at the bottom in order to control scour. The buried portion of the pipe would cross over two Olympic PipeLine Company (OLPC) petroleum lines that run in a north-south direction along the top of the slope. The invert elevation of the proposed pipe at the OPLC crossing would be set at a minimum of one-foot above the petroleum lines. During construction, the top of the project site would be accessed from an existing maintenance road located southwest of the Sunnydale Mobile Home Park, off of Union Avenue NE. The bottom of the site would be accessed through an existing maintenance road located on the north side of the Maple Valley Highway, north of SE 5t Street. The proposal was issued a Determination of Non-Significance — Mitigated (DNS-M)on June 27, 2000. PROJECT LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street SPECIFIED CRITICAL AREA: The subject site contains sloped areas in excess of 40%, which are considered "protected slopes" under the Geologic Hazards section of the Critical Areas Regulations. exempt r • 11. IP Pursuant to RMC section 4-3-050.C.5.e.4, an exemption from the Critical Areas Regulations is hereby granted on the proposed project described on the attached form for the following reason(s): X Modification of Existing Utilities and Streets by 10% or less: Overbuilding (enlargement beyond existing project needs) or replacement of existing utility systems and replacement and/or rehabilitation of existing streets, provided the work does not increase the footprint of the structure, line or street by more than ten percent (10%) within the critical area and/or buffer areas.. The proposed development is consistent with the following (RMC section 4-3-050.C.5.c): 1. The activity is not prohibited by this or any other chapter of the RMC or state or federal law or regulation; 2. The activity will be conducted using best management practices as specified by industry standards or applicable Federal agencies or scientific principles; and, 3. Impacts are minimized and, where applicable, distrubed areas are immediately restored, unless the exemption is a wetland below the size thresholds pursuant to RMC 4-3- 050.C.5.f.1 and f.2. (Tbkl:"-eikA/•-e0Th t2V/0 0 reg im erman, Administrator DATE Planning/Building/Public Works Department exempt CITY OF RENTON Planning/Building/Public Works MEMORANDUM DATE: August 28, 2000 TO: File FROM: Lesley Nishihira, Development/PlanningV SUBJECTS: Variance for Sunnydale Storm System Replacement Project (File No. LUA-00-071, ECF/Appeal File No. LUA-00-098,AAD) The subject project proposes to perform work on slopes in excess of 40%, as well as within 25 feet of the ordinary high water mark of a creek. Therefore, the project is subject to the City's Critical Areas Regulations and the Tree Cutting and Land Clearing Regulations. Pursuant to RMC 4-3-050.C.4, a letter of exemption is required for activities exempt under the Critical Areas Regulations. A letter of exemption has been issued for the proposed work within identified Geologic Hazard areas under RMC 4-3-050.C.5.d.4. The exemption reads as follows: • "Modification of existing utilities and streets by 10% or less: overbuilding (enlargement beyond existing project needs)or replacement of existing utility systems and replacement and/or rehabilitation of existing streets, provided the work does not increase the footprint of the structure, line or street by more than ten percent(10%)within the critical area and/or buffer areas. However, due to review delays, the code amendment which provides an exemption for the work proposed within the stream buffer was not adopted by City Council until August 8, 2000 and will not be effective until September 10, 2000 (see attached Ordinance#4851). Because the proposal clearly falls under the exemption intended for both the Geologic Hazards and Tree Cutting and Land Clearing Regulations as adopted by Council, the project has been processed under the applicable exemption for both the sloped and stream buffer areas. Furthermore, the timing of project construction is such that all relevant code sections will be in full effect. ORDINANCE NO. 4851 (2) Results of previous sampling and analysis of earth materials to be imported to the site. f. Source Statement Not Required for Imported Fill Obtained from Washington State Department of Transportation Approved Source: The source statement defined in RMC 4-8-120.D.19 is not required for those projects located in the Aquifer Protection Area if contractual documents confirm that imported fill will be obtained from a Washington State Department of Transportation approved source. SECTION XXVIII. Section 4-4-130.0 of Chapter 4, Property Development Standards, of Title IV, Development Regulations, of Ordinance No. 4260 entitled "Code of General Ordinances of the City of Renton, Washington" is hereby amended by adding a new subsection, 4-4-130.C.12, which reads as follows: 12. Modification of existing utilities and streets (not otherwise exempted by 4-3-050.C.7) by 10% or less: overbuilding (enlargement beyond existing project needs) or replacement and/or rehabilitation of existing streets, provided the work does not increase the footprint of the structure, line or street by more than ten percent (10%) within the critical area and/or buffer areas. SECTION XXIX. Section 4-5-120.G of Chapter 5, Building and Fire Prevention Standards, of Title IV, Development Regulations, of Ordinance No. 4260 entitled "Code of General Ordinances of the City of Renton, Washington" is hereby amended to read as follows: G. DEFINITIONS OF TERMS USED IN THIS SECTION: AQUIFER PROTECTION AREA (APA): Refer to RMC 4-3-050.B.2, Applicability: Critical Areas Designations/Mapping, Aquifer Protection, and RMC 4-11-010, Definitions A. SECTION XXX. Sections 4-6-030.E.1 and the introductory paragraph of 4-6-030.E.3, of Chapter 6, Street and Utility Standards, of Title IV, Development Regulations, of Ordinance No. 4260 entitled "Code of General Ordinances of the City of Renton, Washington" are hereby amended to read as follows: 4-6-030.E.1: Content: All persons applying for any of the permits and/or approvals contained in subsection C.1 of this Section shall provide a drainage plan for surface water flows entering, flowing within and leaving the subject property. The drainage plan and supportive calculation report(s) shall be stamped by a professional civil engineer registered in the State of Washington. The drainage plan shall be prepared in conformance with the Core and Special Requirements contained in 60 • NOTICE OF APPEAL HEARING RENTON HEARING EXAMINER RENTON, WASHINGTON A Public Hearing will be held by the Renton Hearing Examiner at his regular meeting in the Council Chambers on the seventh floor of City Hall, 1055 South Grady Way, Renton, Washington, on August 29, 2000, at 9:00 AM, to consider the following petition: APPEAL AAD-00-098 Appeal of Determination of Nonsignificance Mitigated in re Sunnydale Storm System Replacement. The City of Renton is proposing replacement of the Sunnydale downstream storm system (File No. LUA-00-071,ECF). Location: SW of Sunnydale Mobile Home Park; North of SE 5th St. Legal descriptions of the files noted above are on file in the Development Services Division, sixth floor, Municipal Building, Renton. All interested persons to said petitions are invited to be present at the Public Hearing. Publication Date: August 18, 2000 Account No. 51067 aadpub • 411 CITY .uF RENTON Hearing Examiner Jesse Tanner,Mayor Fred J.Kaufman July 20,2000 • Ms.Nicola Robinson 3110 SE 5th Street Renton,WA 98058-2824 Re: Appeal of DNS-M for Sunnydale.Storm System Replacement Appeal File No.LUA-004198,AAD Dear Ms.Robinson: Your letter of appeal in the above matter has been`received and a date and time for said hearing have now been established. The appeal hearing has been set for:Tuesday,;August`29 2000, at 9:00 a.m. in the Council Chambers on the seventh floor of City:Hall,at' 0.55 S:Grady Way:in Renton. Should you be unable to attend, would you please appoint a representative to act on your behalf x;. We appreciate your cooperation, and if you have any questions,please contact my secretary. Sincerely, +1.-11 Fred J. Kaufman - Hearing Examiner • FJK:mm cc: Mayor Jesse Tanner Jay Covington, Chief Administrative Officer Larry Warren, City Attorney • Jana Hanson,Development Services Director John C: Ramsey. Neal Whitney • • • ;1055 South Grady Way-.Renton, Washington 98055 -•(425)43076515 1/4 • • / Nicola Robinson 3110SE5tSt, Renton WA 98058-2824 Monday 17th July 2000 Mr Fred Kaufman.Hearing Examiner. City of Renton. 1055 South Grady Way, CITY OF RENTON Renton WA 98055 ' - Ut1 L 1 7 2000 Subject: Sunnydale Storm System Replacement. Project No. LUA-00-071,ECF RECEIVED CITY CLERK'S OFFICE Dear Mr Kaufman, 9:17? I am filing this appeal on behalf of many residents of the Maplewood community, in response to the Determination of Non-significance-Mitigated with Mitigation measures in reference to the above-mentioned project. The designation of the area where the stream, (into which the Sunnydale Storm Water Run-off Pipe empties)and its attached wetland are located is `Resource Conservation.' I believe this is because of the sensitive nature of the area in term of the water bodies here, because it is part of a wild life corridor and because of the presence of many species of animals, including: deer, opossum, coyote, eagles, and herons to name a few. I have photographs of a heron on the banks of the detention pond, and also resting in various trees. There could very well be a nesting area here as they come every year. It would be important to pursue this issue further as pollution of the stream; detention pond and potential degradation of the wetland would put the wildlife here at risk. The stream into which the storm water run off is to be discharged has been given the#29,but has not yet been placed on the `Sensitive (or Critical)Areas Map. The same is true of wetlands#48,both of which were documented in a memo dated September 25th, 1992 by Lynn Guttmann,P/B/PW Department Administrator. (Enclosed)I received a letter from Mayor Jesse Tanner dated June the 2nd 2000, reassuring us that this error is- being corrected. The Critical Areas Map available to the public at City Hall does not yet show this correction. . Our concern reference the above omission is that any maintenance proposal, possible future request for development or rezoning will not take in to account the presence of a stream and wetland if they are not documented. The wetland borders the stream on the north side,the risk of flooding of the stream is always present and associated with this is the potential for overflow into the wetland which would carry with it pollutants from the storm water run-off. Item I- 1.1 Effects of Urbanization. Para 4 from the `Storm Water Management Manual for the Puget Sound Basin. Run-off from urban areas has been shown to contain many different types of pollutants. The run-off from roads and highways is contaminated with oil and grease,lead, cadmium and other pollutants. Residential areas contribute herbicides, pesticides,fertilizers and animal waste to the run-off. All of these can seriously impair beneficial uses of receiving waters. The existing pipe carrying the run- off is old and its integrity is in question. This may suggest that not all of the run-off is reaching its destination and to replace this pipe with a new one could therefor result in increased amounts of run-off The water in the stream at the point where the pipe empties its contents can be seen at times to be foaming, it does this all the way down to the detention pond. Neither the treatment facility for storm water in the Sunnydale Trailer Park and the detention pond into which the stream empties (where it once ran its full course as a tributary of the Cedar River)meet current guidelines and are undersized to deal with the present load. Beneficial uses are impaired and threatened. Ongoing housing development and the resulting mass cutting of trees above the slopes on the northerly border of the wetland pose an ongoing threat to the integrity of the slopes and the ecosystem that is struggling for survival at its base. From this source may come additional polluted run-off, and from the stream yet more. Due to the critical nature of the area in which the stream and wetlands exist, and the ever present risk of degradation and contamination of the wetland from pollutants carried in the stream; we respectfully request that an alternate dumping ground be located for the storm water run- off from the Sunnydale Trailer Park and easements be applied for to this end. There are laws in place that protect streams against degradation and that state `streams are not to be used as a means of conveyance for storm water run-off As the presence of the Wetland and Stream have not been recorded and placed on the appropriate maps etc, we question whether an analysis has been performed on the wetland hydrology, and wetland water quality to show what the effects of this project will be on the health of the wetland?Have tests been performed to show what is being - discharged into the stream that has the potential to adversely effect the wetland area? Thank you for your consideration of the above matter. Sincerely. �� 3S - 62 43 ems-. SfC 5 PaM.L, c)24 S %� 3S3 z se 67e(1 -) cc: Jesse Tanner. Mayor. /RAJ qz3, 33 yy SE S „jzn /44L yJ4J5 City Council Members ••ZO., O .CIT RENTON n Planning/Building/PublicWorks Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator June.29, 2000 Washington State Department of Ecology Environmental Review Section PO Box 47703 Olympia,WA 98504-7703 Subject: Environmental Determinations Transmitted herewith is a copy of the Environmental Determination for the following project reviewed by the Environmental Review Committee (ERC)on June 27, 2000: DETERMINATION OF NON-SIGNIFICANCE-MITIGATED SUNNYDALE STORM SYSTEM REPLACEMENT LUA-00-071,ECF The City of Renton is requesting.Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace700 feet of existing 18-inch corrugated metal storm pipe with new 18-inch high-density polyethylene pipe (HDPE). In addition to Environmental (SEPA) Review,the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet ofthe ordinary high water,mark of a creek. "Location: Southwest of Sunnydale Mobile Home Park;.North of SE 5th'Street. Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton,WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8-11 B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430-6510. If you have questions, please call me at(425)430-7270 For the Environmental Review Committee, 4./A., Lesley Nishihira Project Manager cc: King County Wastewater Treatment Division Larry Fisher, Department of Fisheries David F. Dietzman, Department of Natural Resources Don Hurter, Department of Transportation Duwamish Tribal Office • , Rod Malcom, Fisheries, Muckleshoot Indian Tribe(Ordinance) , US Army Corp. of Engineers. Washington State\ 1055 South Grady Way-Renton,Washington 98055 Oil Oil NOTICE OF ENVIRONMENTAL DETERMINATION ENVIRONMENTAL REVIEW COMMITTEE RENTON,WASHINGTON The Environmental Review Committee has issued a Determination of Non-Significance-Mitigated for the following project under the authority of the Renton Municipal Code. SUNNYDALE STORM SYSTEM REPLACEMENT LUA-00-071,ECF Environmental review for replacement of 700 feet of existing storm pipe. Location: SW of Sunnydale Mobile Home Park; North of SE 5th St. Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8-11 B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430-6510. Publication Date: July 3, 2000 Account No. 51067 dnsmpub.dot AFFIDAVIT OF PUBLICATION • Charlotte Ann Kassens, first duly sworn on oath states that he/she is the Legal Clerk of the SOUTH COUNTY JOURNAL 600 S. Washington Avenue, Kent, Washington 98032 a daily newspaper published seven (7)times a week. Said newspaper is a legal NOTICE OF ENVIRONMENTAL newspaper of general publication and is now and has been for more than six DETERMINATION ENVIRONMENTAL_REVIEW COMMITTEE months prior to the date of publication, referred to, printed and published in the . _ RENTON,WASHINGTON English language continually as a daily newspaper in Kent, King County, The Environmental Review Committee Washington. The South CountyJournal has been approved as a legal has issued a Determination of•Non- g pp g Significance-Mitigated for the following pro- • newspaper by order of the Superior Court of the State of Washington for King , ject under.the authority of the Renton . County. Munical Code. SUNNY A E STORM SYSTEM. ' • The notice in the exact form attached, was published in the South REPLACEMENT . County Journal (and not in supplemental form)which was regularly distributed to , LUA-00-071,ECF the subscribers during the below stated period. The annexed notice, a Environmental review for replacement of , 700 feet of existing storm pipe. Location: SW of Sunnydale Mobile Home Park; Sunnydale Storm System Replacement w ' North of SE 5th•St. ? _;s/t, .. Appeals of the environmental determina- *tion must be filed in writing on or before as published on: 7/3/00 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required The full amount of the fee charged for said foregoing publication is the sum of I $75.00 application fee with: Hearing $40.25, charged to Acct. No. 8051067. .Examiner,City of Renton,and 1055 South g Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Legal Nu 920 7, lRenton Municipal Code Section 4-8-11B. Additional information regarding the appeal • process may be obtained from the Renton City Clerk's Office,(425)430-6510. Published in the South County Journal � /-- July 3,2000.7920 Leg erk, South County Journal • Subscribed and sworn before me on this /al.\ day of 4_ ___, 2000 . `.oliiil►iii,,,. . pRIE p0 0 v▪ /GOB` /'QFr» © NOTAAy S z:71,...2.....,. )1.,,,jr,___ _� = Notary Public of the State of Washington residing in Renton • cf,A 0. PUB Os ® o King County, Washington 4i/Op 11 A WSN`` %c��� • • ' ENVIRONMENTAL DETERMINATION POSTED TO NOTIFY INTERESTED PERSONS OF AN ENVIRONMENTAL ACTION PROJECT NAME; SUNNYDALE DOWNSTREAM STORM SYSTEM REPLACEMENT PROJECT NUMBER: LUA-00.071,ECF The City of Renton is requesting Environmental(SEPA)Review for the replacement of the Sunnydale downstream storm system.The proposal is to replace 700 feet of existing 18-Inch corrugated metal storm pipe with new 18-Inch high-density polyethylene pipe(HOPE). In addition to Environmental(SEPA) Review,the project requires a Certificate of Exemption from the City's Critical Areas Regulations In order to perform work on slopes In excess of 40%and within 25 feet of the ordinary high water mark of a creek. Location:Southwest of Sunnydale Mobile Home Park;North of SE 5'Street. THE CITY OF RENTON ENVIRONMENTAL REVIEW COMMITTEE (ERC) HAS DETERMINED THAT THE PROPOSED ACTION DOES NOT HAVE A SIGNIFICANT ADVERSE IMPACT ON THE ENVIRONMENT. • Appeals of the environmental determination must be filed in writing an or before 5:00 PM July 17,2000.Appeals must be filed In writing together with the required 575.00 application fee with:Hearing Examiner,City of Renton, and 1055 South Grady Way,Renton,WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4.8.11B.Additional information regarding the appeal process may be obtained from tho Renton City Clerk's Office,(425)430.6510. e en, sr : C N 1 V e Hr 2TV Y d d eeresr e' A< s Ti rip ee®�/ '�� xc nx sr�b; + 7t' //�420 ` 0 �� ri" svw•m ` Pal�� ; • VIi yrh• _ SE SDI r �3 sera sr S �AZ s r„CT Nov*rr PROJECT LOCATION ,is � � S.' \ CEDAR ,,� RENTON N ® sf o �. • PY°ET @ s Sin 3 FOR FURTHER INFORMATION,PLEASE CONTACT THE CITY OF RENTON,DEVELOPMENT SERVICES DIVISION AT(425)430-7200. DO NOT REMOVE THIS NOTICE WITHOUT PROPER AUTHORIZATION IPlease Include the project NUMBER when calling for proper file identification. I ' CERTIFICATION • I, 4o.ci vt-e 0P 34?a,-J , hereby certify that 7 copies of the above document were posted by me in 4 conspicuous places on or nearby the described property on; \ 3v co . Signed: - aie . - ATTEST: Subcribed and sworn before me,a Nortary Public,in and f the State of Washington residing in r0,„ , ,on the 1 /'9-- day of • 4 MARILYN KAMCHEFF Y? co__-2-,A .! + NOTARY PUBLIC /1 ; STATE OF WASHINGTON IV7ARILYN KAMCHEFF �` COMMISSION EXPIRES MY APPOINTMENT EXPIRES:6-29-03 ( JUNE 29, 2003 SO CITY OF RENTON MEMORANDUM Date: June 29, 2000 To: Allen Quynn/Surface Water Utility Section From: Lesley Nishihira/Development Planning Ue Subject: Sunnydale Storm System Replacement Project No. LUA-00-071,ECF This letter is written on behalf of the Environmental Review Committee (ERC) and is to advise you that they have completed their review of the subject project. The ERC, on June 27, 2000, issued a threshold Determination of Non-Significance-Mitigated with Mitigation Measures. See the enclosed Mitigation Measures document. Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Renton, Municipal Code Section 4-8-11 B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430-6510. If you have any questions or desire clarification of the above, please call me at (425)430-7270. dnsmmemo S. CITY OF RENTON DETERMINATION OF NON-SIGNIFICANCE (MITIGATED) MITIGATION MEASURES APPLICATION NO(S): LUA-00-071,ECF APPLICANT: City of Renton/Surface Water Utility Division PROJECT NAME: Sunnydale Downstream Storm System Replacement Project DESCRIPTION OF PROPOSAL: The City of Renton is requesting Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace 700 feet of existing 18-inch corrugated metal storm pipe with new 18-inch high-density polyethylene pipe (HDPE). In addition to Environmental (SEPA) Review, the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet of the ordinary high water mark of a creek. LOCATION OF PROPOSAL: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street MITIGATION MEASURES: 1. The project shall comply with the recommendations contained within the Geotechnical Report prepared by Zipper Zeman Associates, Inc. dated May 10, 2000. mitmeasures CIT��F RENTON eel ' Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator June 29, 2000 TO: Parties of Record SUBJECT: Sunnydale Storm System Replacement Project No. LUA-00-071,ECF Dear Resident: This letter is written on behalf of the Environmental Review Committee (ERC) and is to advise you that they have completed their review of the subject project. The ERC, on June 27, 2000, issued a threshold Determination of Non-Significance-Mitigated with Mitigation Measures.. See the enclosed Mitigation Measures document. Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8-11 B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430-6510. The preceding information will assist you in planning for implementation of your project and enable you to exercise your appeal rights more fully, if you choose to do so. If you have any questions or desire clarification of the above, please call me at(425)430-7270. For the Environmental Review Committee, (75724,-(-3 J ' Lesley Nishihira Project Manager ' cc: Mr. Bryan Heath/Owner King County/Owners LaPianta LLC/Owners Enclosure • r)NSMI FTTFR 1055 South Grady Way-Renton, Washington 98055 ®This paper contains 50%recycled material,20%post consumer • CITY OF RENTON DETERMINATION OF NON-SIGNIFICANCE (MITIGATED) MITIGATION MEASURES APPLICATION NO(S): LUA-00-071,ECF • APPLICANT: City of Renton/Surface Water Utility Division PROJECT NAME: Sunnydale Downstream Storm System Replacement Project DESCRIPTION OF PROPOSAL:_ The City of Renton is requesting Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace 700 feet of existing.18-inch corrugated metal storm pipe with new 18-inch high-density polyethylene pipe (HDPE). In addition to Environmental (SEPA) Review, the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet of the ordinary high water mark of a creek. LOCATION OF PROPOSAL: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street MITIGATION MEASURES: 1. The project shall comply with the recommendations contained within the Geotechnical Report prepared by Zipper Zeman Associates, Inc. dated May 10, 2000. • mitmeasures , ., _ , CITY OF RENTON • DETERMINATION OF NON-SIGNIFICANCE (MITIGATED) APPLICATION NO(S): LUA-00-071,ECF APPLICANT: City of Renton/Surface Water Utility Division PROJECT NAME: Sunnydale Downstream Storm System Replacement Project DESCRIPTION OF PROPOSAL: The City of Renton is requesting Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace 700 feet of existing 18-inch corrugated metal storm pipe with new 18-inch high-density polyethylene pipe (HDPE). In addition to Environmental (SEPA) Review, the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet of the ordinary high water mark of a creek. LOCATION OF PROPOSAL: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street LEAD AGENCY: City of Renton Department of Planning/Building/Public Works Development Planning Section The City of Renton Environmental Review Committee has determined that it does not have a probable significant adverse impact on the environment. An Environmental Impact Statement (EIS) is not required under RCW 43.21C.030(2)(c). Conditions were imposed as mitigation measures by the Environmental Review Committee under their authority of Section 4-6-6 Renton Municipal Code. These conditions are necessary to mitigate environmental impacts identified during the environmental review process. Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8- 11 B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430- 6510. PUBLICATION DATE: July 03,2000 DATE OF DECISION: June 27, 2000 SIGNATURES: /MN W.,el t hil 7/JO GrZ r an dministrator DATE Department of I ning/Building/Public Works 4-41" 0 06 Jim hepherd,Ad inistrafo'r DATE Co munity Services o°' 87-- ela Lee W� el r, Fire C ief �2 DATE Renton Fire Department dnsmsign • • CITY OF RENTON DETERMINATION OF NON-SIGNIFICANCE (MITIGATED) MITIGATION MEASURES APPLICATION NO(S): LUA-00-071,ECF APPLICANT: City of Renton/Surface Water Utility Division PROJECT NAME: Sunnydale Downstream Storm System Replacement Project DESCRIPTION OF PROPOSAL: The City of Renton is requesting Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace 700 feet of existing 18-inch corrugated metal storm pipe with new 18-inch high-density polyethylene pipe (HDPE). In addition to Environmental (SEPA) Review, the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet of the ordinary high water mark of a creek. LOCATION OF PROPOSAL: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street MITIGATION MEASURES: 1. The project shall comply with the recommendations contained within the Geotechnical. Report prepared by Zipper Zeman Associates, Inc. dated May 10, 2000. mitmeasures • STAFF City of Renton REPORT Department of Planning/Building/Public Works ENVIRONMENTAL REVIEW COMMITTEE A. BACKGROUND ERC MEETING DATE: June 27, 2000 Project Name: Sunnydale Downstream Storm System Replacement Project Applicant:. City of Renton; Surface Water Utility Division (Allen Quynn) File Number: LUA-00-071, ECF Project Manager: Lesley Nishihira Project Description: The City of Renton is requesting Environmental (SEPA) Review for the replacement of the Sunnydale downstream storm system. The proposal is to replace 700 feet of existing 18-inch corrugated metal storm pipe with new 18- ' inch high-density polyethylene pipe (HDPE). The existing pipe is buried for 160 feet at the top of a slope, with the remainder of the pipe constructed above ground downward of the slope. Presently, the upper 60 feet of the pipe is partially crushed and has resulted in joint separation, subsequent water leakage and reduction in the conveyance capacity of the pipe. In addition, one of the two manhole structures on the slope has been undermined and is in danger of collapsing. The project would include the removal of the existing pipe and associated structures. The new pipe would be buried in the existing trench at the top and would follow an improved above ground alignment to the bottom of the slope. The new pipe would have no intermediate structure and would also have an energy dissipator at the bottom in order to control scour. The buried portion of the pipe would cross over two Olympic PipeLine Company(OLPC) petroleum lines that run in a north-south direction along the top of the slope. The invert elevation of the proposed pipe at the OPLC crossing would be set at a minimum of one-foot above the petroleum lines. During construction, the top of the project site would be accessed from an existing maintenance road located southwest of the Sunnydale Mobile Home Park, off of Union Avenue NE. The bottom of the site would be accessed through an existing maintenance road located on the north side of the Maple Valley Highway, north of SE 5th Street. Project construction is scheduled to begin August 21, 2000 and is anticipated to be complete by September 22, 2000. In addition to Environmental (SEPA) Review, the project requires a Certificate of Exemption from the City's Critical Areas Regulations in order to perform work on slopes in excess of 40% and within 25 feet of the ordinary high water mark of a creek. Project Location: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street Exist. Bldg. Area gsf N/A Proposed New Bldg.Area gsf N/A Site Area Approx. 0.3 acre Total Building Area gsf N/A RECOMMENDATION Staff Recommend that the Environmental Review Committee issue a Determination of Non-Significance—Mitigated(DNS-M). ercrpt City-of Renton P/B/PW Department Env. I Review Committee Staff Report SUNNYDALE DOWNSTREAM STO_:A 1.'srsiEM REPLACEMENT PROJECT LUA-00-071,ECF REPORT AND DECISION OF JUNE 27,2000 Page 2 of 3 B. RECOMMENDATION Based on analysis of probable impacts from the proposal, staff recommends that the Responsible Officials make the following Environmental Determination: DETERMINATION OF DETERMINATION OF NON-SIGNIFICANCE XX NON-SIGNIFICANCE-MITIGATED. Issue DNS with 14 day Appeal Period. XX Issue DNS-M with 14 day Appeal Period. Issue DNS-M with 15 day Comment Period followed by a 14 day Appeal Period. C. MITIGATION MEASURES 1. The project shall comply with the recommendations contained within the Geotechnical Report prepared by Zipper Zeman Associates, Inc. dated May 10, 2000. D. ENVIRONMENTAL IMPACTS In compliance with RCW 43.21 C. 240, the following project environmental review addresses only those project impacts that are not adequately addressed under existing development standards and environmental regulations. 1. Earth Impacts: Based on the City's critical areas maps, the subject site is designated as having erosion hazards, high to very high slide hazards, as well as 25%to 40% and 40% and greater steep slope hazards. According the King County Soil Survey, the area consists of Alderwood soils (primarily gravelly sandy loam) and a small amount of Puyallup soils (primarily fine sandy loam)at the lower end of the site. Areas of the site also contain evidence of the remnant of a shallow landslide/erosion scar. There is the presence of several trees with curving and leaning trunks, suggesting that the vegetation is subject to slow downslope creep of near surface soils. The site is best described as containing a developed upland including and adjacent to the Sunnydale development, then proceeding into an undeveloped ravine and lowland. The developed upper portion of the project site is relatively level and contains a gravel surface road that provides access to a storm water detention pond located on the east side of the road. The slope below the upper detention pond is approximately 30%to 35%, of which portions have been oversteepened and reinforced with large rock in order to repair erosion. There is also a cleared easement area for overhead electrical transmission lines and underground petroleum pipelines. Beyond the developed area,the large ravine extends southwesterly from the easement and terminates on the north side of the Cedar River Valley. The ravine is vegetated with brush, as well as deciduous and evergreen trees, and contains a shallow stream. The storm pipe replacement project would reduce erosion at the pipe outlet, as well as the chance of landslides at the top of the slope as a result of the leaking pipe. The elimination of the manholes would also reduce erosion and landslide potential at other location due to pipe leaks or the failure of structures. The installation of the proposed pipe would disturb approximately 352 cubic yards of soils. An additional 20 cubic yards of soil would be removed during construction of the proposed energy dissipator structure. The existing rock buttress would be dismantled and reassembled on-site. For drainage purposes, some additional rock backfill would be placed at the rock buttress. Approximately 16 cubic yards of controlled density fill would be installed within the trench to protect the existing gas pipelines. No new impervious surfaces would be added as part of the project. The existing pipe, manholes and pipe supports would be removed by hand. Some brush and blackberries would be cleared at the top of the project where the pipe is located underground. For the portion of the alignment where the pipe is above ground, only a minimal amount of vegetation would be cleared. In addition, some grasses would be disturbed for the construction of the proposed outfall structure. No trees are proposed to be removed. The exposed soils at the system outlet, as well as any disturbed soils, would be seeded with natural grass. A Geotechnical Report prepared by Zipper Zeman Associates, Inc. dated May 10, 2000 was submitted with the land use application. The report concludes that the steep slope is unlikely to degrade due to instability as a result of the proposed project because of the underlying native glacially consolidated soils. The report also contains recommendations regarding the sensitive areas on the site, including trench excavation and backfilling, structure foundation, subgrade preparation, and tightline anchorage—all of which staff recommends the project be required to comply with in order to reduce potential erosion impacts. ercrpt City of Renton P/B/PW Department } Env I Review Committee Staff Report SUNNYDALE DOWNSTREAM STC,,SYSTEM REPLACEMENT PROJECT I LUA-00-071,ECF REPORT AND DECISION OF JUNE 27,2000 Page 3 of 3 Mitigation Measures:The project shall comply with the recommendations contained within the Geotechnical Report prepared by Zipper Zeman Associates, Inc. dated May 10, 2000. Nexus: Environmental (SEPA)Ordinance 2. Water Impacts:The proposed project would convey storm water runoff from the Sunnydale Mobile Home Park down a steep slope to an energy dissipator located at the base of the slope. The energy dissipator would then discharge the storm runoff into a natural groundwater fed stream which continues west for approximately 1,300 feet and enters two small detention ponds in series. Where the stream enters the first pond, a second outfall discharges additional runoff from a storm system serving the Maplewood Subdivision. Once the stream exits the last detention pond, it enters a 24-inch storm pipe which conveys the stream across the maple Valley Highway for approximately 350 feet before discharging into the Cedar River. The purpose of the project is to reduce runoff water impacts. It would replace an existing pipe, which is in poor condition and leaking,with a more reliable storm water system. It would also replace an eroding outfall structure with an energy dissipator to reduce impacts from erosion and scour. The project includes the use of best management practices to control erosion and sedimentation impacts, especially during construction of the outfall, in order to reduce sedimentation of the stream. Prior to beginning work, silt fencing would be placed along the stream bank between the areas to be disturbed and the ordinary high water mark of the creek. In order to minimize the introduction of sediment into the stream during construction of the energy dissipator, a temporary 18-inch bypass pipe would be installed to divert flows around the construction area as recommended by the Washington State Department of Fish and Wildlife (WDFW)at a site meeting. The pipe would be laid along the streambed on the opposite side of construction, beginning at a point approximately 20 feet upstream of the proposed structure. Sandbag headwalls would be constructed by hand around both ends of the pipe to act as a dam and direct the stream flow into the pipe. Plastic sheeting would be used on the upstream side of the headwalls to minimize infiltration though the sandbags. The bypass pipe would discharge approximately 20 feet downstream of the energy dissipator. The bypass pipe and headwall would be removed immediately upon completion of the downstream work. In-water construction would be done within the allowed WDFW Hydraulic Project Approval (HPA)construction period. Mitigation Measures: No further mitigation is recommended. Nexus: N/A 3. Wildlife Impacts:The subject site has been known to include the presence of hawks, songbirds, deer and frogs. In addition, the Cedar River(located approximately one-half mile down gradient of the site. The Cedar River is used by migrating adult and juvenile chinook salmon, coho salmon, and native char, including bull trout. The project site is also located within the Pacific Flyway migration route. The proposal is not anticipated to negatively impact wildlife or habitat areas. Mitigation Measures: No further mitigation is recommended. Nexus: N/A E. COMMENTS OF REVIEWING DEPARTMENTS The proposal has been circulated to City Departmental/Divisional Reviewers for their review. Where applicable, these comments have been incorporated into the text of this report as Mitigation Measures and/or Notes to Applicant. X Copies of all Review Comments are contained in the Official File. Copies of all Review Comments are attached to this report. Environmental Determination Appeal Process Appeals of the environmental determination must be filed in writing on or before 5:00 PM July 17, 2000. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, and 1055 South Grady Way, Renton,WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8-11B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425)430-6510. ercrpt 405 C7 ? \\ NE 12TH ST e #`,. NE PPRK`OR ?' z = tin 4„.,,, �900 ' ' 0OTNE a ^¢ o w z 900 NE 10TH ST SE 2 o W¢ 1_u z z 1STTH z N 8TH ST z m NE- < ¢ w N z. NE ��ST = IPAT, Z = _ ''� � =w w w RT < < _ o m 0 Na N 6TH ST w o Vc oJ Y w = 0 a o // _1 a_ • co en N 4TH ST y / 405 NE 4TH ST S N '' 46 5S 3RD ST 5i° licnIl 015D)/ it NE 4 O a ��/ 4, _1 `, 9� z MO dD ST F SUNNYDALE J<� MOB HOME > D STcn m ` PARK ¢ < rn � �FJ o s N a Q 'y4,y SE 511-1 ST 3 tr S 6TH STN 0 W < �F PROJECT T { ` •TH 3T o tnkg!, CT sl LOCATION e' Cec s o ¢ `�9�. W aE — = o z__ z„DiIR 4 s� REN TON No (16) SE )p0 to c.:7 \ iii SF PUGET S a o z 0 o ^ w PROJECT TITLE: PROPOSED WORK: Sunnydale Downstream Replace existing damaged pipe, Storm System Replacement Project structures, and eroding outfall with ADJACENT PROPERTY OWNERS: new pipe, improved alignment and DIRECTIONS TO SITE: outfall location, and energy Take 1-405 South to Maple Valley King County dissipator. Hwy. (SR169), East on SR169 to SHEET TITLE: VICINITY MAP AT: Township 23N, Range 5E SE 5th. A maintenance access SCALE: NOT TO SCALE Section 16 road to the site is located just 2z west of SE 5th. SHEET: 1 of 3 c., ASSISTANCE BY: Entranco a DATUM: City of Renton DRAWN BY: GLS DATE: May 2000 xLi-------- _ o W ~ Z c O O } > u7 Z O Y 1— 1- OL Li /O w01- � ZQ =' N iij o`t. ,�, Q —�OLYMFIk ` FELINE EASEMENT _ J w (BASED ON R/W. M. . o �v -ED W/ STATE P.N.R. zQ k �� _ ) mm 1/16TH LINE . c9.' N 01'04'1 1 " E (170.21 ' DEED) '2.4-a- p w ? , �� �\ �.. rz0 o w� rn w w _ • W Z 1- MO toJQ Z . BP A. 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IR-8 I Residential D du/ac I—I Center Downtown* •• (Grey Text) Prezones SECT/TOWN/RANGE PM Residential Manufactured Homes Ell Center Office Residential nrii Automall District A (R-10I Residential 10 du/ac I-I Commercial Arterial I•:•:•:1 Automall District B I� Commercial Office • For additional regulations in overlay districts 1R-14 I Residential 14 du/ac u not shown on this map, please see RMC 4-3. 3 I RR-I I Residential Multi-Family Infill I—I Industrial - Heavy A w • Residential Multi-Family Neighborhood Center In Industrial - Medium PAGE Y Residential Multi-Family Suburban Center n Industrial - Light INDEX C. N MI Residential Multi-Family Urban Center• r---1 Public Use Y O O co x % '= CIIWOF•RENTON gi ; Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator June 28,2000 Nicola Robinson Maplewood Community 3110 SE 5th St. Renton,WA 98058 • SUBJECT: SUNNYDALE DOWNSTREAM STORM SYSTEM REPLACEMENT PROJECT(LUA-00-071,ECF) Dear Ms.Robinson: Thank you for your letter dated June 20, 2000, concerning the environmental issues related to the above referenced project. This project is needed to replace an existing storm system that is at risk of failure, which could cause slope destabilization and adversely impact the downstream receiving water bodies and properties. The existing storm system currently crosses two high-pressure petroleum transmission lines owned by Olympic Pipeline Company,which could be damaged if the existing storm system failed. The project does not result in any change in the quantity or quality of runoff, since the project does not replace or add any new impervious surface. Furthermore, the existing storm line will be replaced with a storm line that is the same size (18" inside-diameter pipe), and is not being upsized to convey additional runoff. The project will relocate the existing storm system in a location further away from the stream and install an energy dissipator at the outfall to reduce erosion, which will benefit water quality and the stream in general. The storm system conveys runoff from an existing upstream development, which met the required storm water standards at the time that the development was approved. In fact,the Plat that you live in also discharges storm water without any water quality treatment, since it was developed prior to the adoption of any water quality treatment standards. When the Sunnydale Mobile Home Park site redevelops in the future, the redevelopment project could be required to provide water quality treatment at that time, as a condition of redevelopment. The nonpoint source pollution from a development's storm water is controlled through the use of the storm water "Best Management Practices" that are required at the .time that the development is approved. The use of Best Management Practices are recognized as an acceptable..method of satisfying WAC 173-201A-070 (See WAC 173-201A-100(10) and WAC-173-201A-160(2)). The proposed project will implement best management practices to prevent erosion during construction. The discharge of storm water runoff into streams is allowed, provided that the project meets any required storm water standards for detention and water quality at the time of construction. The proposed project does not trigger any storm water drainage standards for detention or water quality, since the project does not add any new impervious surface. The Sunnydale Mobile Home Park site met all storm water standards and"Best Management Practices"at the time of development. 1055 South Grady Way-Renton,Washington 98055 June 28,2000 Page 2 • • If you have any additional questions, please call me at 425-430-7270, or Allen Quynn, project manager, at 425-430-7247. Sincerely, . Lesley Nishihira,Associate Planner Development Services Division • cc: Allen Quynn Ron Straka Jana Hanson Gregg Zimmerman Jim Sheperd Chief Wheeler Mayor Jesse Tanner City Council Members Parties of Record Larry Fisher,WDFW • • • • H:\DIVISION.S\DEVELOP.SER\DEV&PLAN.ING\PROJECTS\00-07112000-294.doc\cor CITY OF RENTON Planning/Building/Public Works MEMORANDUM DATE: June 27, 2000 TO: Members of the Environmental Review Committee FROM: Lesley Nishihira, Development/Planning') SUBJECT: Sunnydale Downstream Storm System Replacement Project (File No. LUA-00-071, ECF) The attached letter regarding the above referenced project was received from a concerned party of record. The issues raised in the comment letter have been considered by the Surface Water Utilities Section and have been addressed in a response letter(draft copy is attached). Please contact me at x7270 if you have any questions or concerns relating to this project. Thank you. cc: Jana Hanson Cii, _Renton Department of Planning/Building/Alt'v cam,r.s ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: 1:72)1t ' COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley Nishihira PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th•Street • SITE AREA .3 acre BUILDING AREA(gross): SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental (SEPA) review, the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historic/Cultural Natural Resources Preservation Airport Environment 10,000 Feet 14,000 Feet qiummai unyott- (00(.0 Kvi(cuL , B. POLICY-RELATED COMMENTS • • C. CODE-RELATED COMMENTS We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas w ere additional information is needed to properly assess this proposal. MI/ 2(VY '7— dp--OD Signature o Director or A horize epresentative Date devapp Rev.10/93 Nicola Robinson. Representing Maplewood Community . .�. ..--. 3110 SE 5th St ono®Eo , Renton WA 98058. SEEPA Environmental Review Committee. Tuesday 20th June 2000 J U N 2 0 2000 c/o Marilyn Peterson, City Clerk , BUILDING DIVISION Renton City Hall. y 1055 South Grady Way, Renton WA 98055 Reference: Sunnydale down stream storm system replacement project. Land use#LUA - 00 - 071 -V - HECF Dear Committee Members, We have some serious concerns with regards the above mentioned project. They are as follows: 1) Because of the close proximity of the stream to the wetlands there is the very real risk of overflow of the stream into the wetlands during periods of heavy rain, and the pollution that would result. There have already been periods of flooding at the point of the proposed project and further down stream. 2) There is no water treatment facility attached to this line. Also what facilities may be in place are not adequate and would not meet current standards. 3)Use of the stream as a method of conveyance of storm water is not in compliance with the following State and Federal Law. Reference: DOE 'Storm Water Management Manual for the Puget Sound Basin." Page III - 5 - 4. "Use of Waters of the State and Waters of the United States, including wetlands and streams, for the treatment or conveyance of wastewater(including storm water) is prohibited under state and federal law." 4) Ref: WAC 173-201A-070 ANTIDEGRADATION. The antidegredation policy of the state of Washington, as generally guided by Chapter 90.48 RCW, Water Pollution Control Act, and Chapter 90.54 RCW, Water Resources Act of 1971, is stated as follows: 1) Whenever the natural condition of said waters are of a lower quality than the criteria assigned, the natural conditions shall constitute the water quality criteria. 2) Whenever waters are of a higher quality than the criteria assigned for said waters,the existing water quality shall be protected and pollution of said waters which will reduce the existing quality shall not be allowed, except in those instances where: a) It is clear, after satisfactory public participation and intergovernmental coordination, that overriding considerations of the public interest will be served. b) All wastes and other materials and substances discharged into said waters shall be provided with all known, available, and reasonable methods of prevention, control, and treatment by new and existing point sources before discharge All activities which result in the pollution of waters from nonpoint sources shall be provided with all known, available , and reasonable best management practices. 5) Use of the stream as part of a storm water management system is inconsistent with the Water Pollution Control Act (Chapter 90.48.RCW) 6) Pollutants contained in the storm and surface water run off are fed into the stream and discharged into the Cedar River via a retention pond which is poorly maintained and does not meet current standards and requirements. The result is degradation of water quality of the stream, the Cedar River and the bodies of water it replenishes. There are potential adverse impact on wild life, especially the salmon who use the Cedar River and its tributaries as spawning ground. There is a very real risk of damage to fish life. The original pipe which carries storm water run off from up on the hill where the 'Sunnydale Mobile Home Park' is located, was constructed (I have been told)in the early eighties, and it"appears this was inconsistent with and out of compliance with the Laws passed in 1971 as referenced above; ie the Water Pollution Control Act and the Water Resources Act. There is no water treatment facility attached to this line; the facility for collection of the storm water in the mobile home park(if any) does not meet current standards. The current pipe runs along the edge of a year round stream which is inventoried on the sensitive areas map as#'S29.' and it discharges its contents into the referenced stream. The stream runs along the southerly border of a wetlands #W48. The designation of the area in which the Wetland, Stream and surrounding woods exist is 'Recourse Conservation.' CG . COctiPc-t( (cr) { Much eat ill the last century, long before the co u.,ciun of this neighborhood in the mid 1940's,the stream fed the wetlands and a grove of enormous cedars flourished here. Many skeletons of which are scattered throughout this area many of them 4 or more feet in diameter. Progress, and human population growth have resulted in the wetlands and stream giving up much of their right to coexist with development. There size has diminished and they are now being degraded by pollutants in storm and surface water. The above referenced project wants to maintain use of the stream as a source of conveyance for storm water and surface water run off. The Federal and State Law already mentioned prohibits such use. The City Council members and the various departments at City Hall have to be commended with regards their successful efforts to improve and bring life back to the City Center. I believe all these individuals depend in part on public input and insight to help guide them in making the best possible decision for everyone and for the good of the fragile and beautiful natural environment that surrounds us. Despite the fact that the present system of disposal of storm water run off from the Sunnydale Mobile Home Park already exists, and this usually makes any future maintenance automatic, and simply'Grand-fathered' in.' We ask that you; the SEEPA review Committee members consider this project not as a given, but as an opportunity to; continue the processes of: protection of our waterways, for thoughtful control and disposal of the pollutants that result from our presence here, and continued compliance with State and Federal Laws to avoid degradation of our waterways, processes that I am sure are priorities on the cities agenda. We respectfully request that a determination of significance be your decision, finding that there will be significant environmental impacts as a result of continued use of the stream for conveyance of storm water run off. As a result we would ask the various groups with the authority to do so would seek'easements' in other locations to relocate the present system, and to bring into compliance storm water treatment facilities associated with it. Sincerely. • GiTY Og "rid 011, I Vityrip;i=ilimommmil REC WED JUN 2 0 2000 BUILDING DIVISIONvir c I, 3.sl7 SF S st, Residents of the Maplewood Community. cc. Marilynn J Peterson. City Clerk Members of the Renton City Council. SEEPA Environmental Review Committee Meeting Members. Meeting scheduled June 27th Alan Quynn isiaks Lorna.Nishihira. Greg Zimmerman. (��, Jan Shepherd. W a�s�.a, , � ` a tatik ° �!�� rl sid c Chief Wheeler. cc • t • JUN202000 Please find attached for your referrence: BUILDING DIVISION 1) Memorandum from: Lynn Guttman. P/B/PW Department Administrator. Dated: September 25th, 1992. To Mary Lynn Myer,Principal Planner. Subject: Maplewood Wetlands and Sensitive Areas. 2) Letter from: Mayor Jesse Tanner. Dated: June 2nd 2000 Subject: Critical Areas Map Omission. 3� s �ti�©`roG PI�� • :yam; CIT'�i i RENTON N L Mayor Jesse Tanner June 2,2000 Nicola Robinson 3.110 SE 5'h Street Renton,WA 98058 SUBJECT: Critical Areas Map Omission-Maplewood Wetlands Dear Ms.Robinson: Thank you for your letter of May 17, 2000,bringing this oversight to the City's attention. In fact, the critical areas map change described in.Lynn Guttmann's'inennorandum was addressed in 1992. The revised version of the Wetlands arid{Streams Map showing 'Wetland W-48 and Stream S-29 was presented as a figure in the original 1993 adoption of the Land"Use Element of the Comprehensive Plan. Unfortunately, the wrong version of this map was included:,in the current Critical Areas Ordinance. This error is being corrected: As a point of clarification, with the exception of'the Steep Slopes:Map, the maps in the Ordinance are not critical to the application of the.regulations;;;; Rather,;the regulations are based on explicit criteria identified in the Code. The Wetlands Map is included for reference only. The 1991 wetlands mapping;was gleaned from a variety of sources, including prior wetland studies, soil surveys, and aerial photos. Complete data on all wetlands Within the City was not and is not now available. Consequently, the mapping_was never intended to establish the presence or absence of wetlands at a specific location. At the;time development is proposed for a particular site, disclosure of the existence of wetlands and delineation of their boundaries are required as part of the application and review process. It is, however, the City's intent to provide the public with the best available information. Thank you again for your comments. erely, Jesse Tanner Mayor cc: City Clerk(Referral#20045-C) City Council Members . • . . . • , . Sue Carlson Gre Zimmerman'; .. . .. - 1055 South Grady Way -Renton,Washington 98055 -.(425)430-6500 /FAX(425)430-6523 0 This paper contains 50%recycled material;20%post consumer P.mo d 41) D-P-- cee CITY OF RENTON MEMORANDUM DATE: September 25, 1992 TO: R ton City Council via Mayor Earl Clymer FROM: nn ttmann, P/B/PW Department Administrator STAFF CONTACT: M. ne Myer, Principle Planner SUBJECT: Maplewood Wetland and Sensitive Areas WETLAND: Recently, two residents representing the Maplewood Forest and Wildlife Society brought to the City's attention the existence of a wetland roughly six acres in size and two associated streams, all of which appear to have been overlooked by the City's wetland inventory. On September 10, 1992, I met with Nicola Robinson at the site to verify this claim. At this site, I verified the presence of a wetland roughly 6 acres and the associated streams. The wetland is at the east end of a•dirt road immediately north of the Maplewood subdivision. The wetland consists of an emergent wetland, scrub shrub, and forested wetland. Wetland plants present include cattails, sedges, skunk cabbage; willow, and alder, to name a few. A small man made detention pond also exists north of the same dirt road. The detention pond is associated with the lower reach of the stream near the Maple Valley • highway. Because of its man made nature, this pond would not be classified as a wetland under:the wetland ordinance (Ord. #4346, Sec. 4-32-3.C.)The approximate locations of these sensitive areas were mapped based on the site visit, topographic maps, and aerial photographs. All pertinent elements of the City's critical areas inventory have been updated to include the wetland and associated streams. The wetland will be numbered W-48. The associated streams will be numbered S-29. LAND USE DESIGNATION: Presently this area is designated Low Density Single Family in the Council's Preferred Land Use Alternative map. Underlying zoning could include G-1 (one dwelling unit per one acre) or RC, (one dwelling unit per 10 acres). The area-wide zoning process will address this area. Deadline for area-wide zoning requests is October 31, 1992. Requests may also be submitted during the neighborhood meetings to be held October • 13, 20, 22, 27, 29, of 1992. The wetland, of course, will fall under the jurisdiction of the City's Wetland Ordinance (Ord. #4346) as well as the underlying zone. Transmitted with this memo are the following items: 1. A map showing the approximate location of the wetlands and streams based on the staff site visit, aerial photographs, and topographic maps (Exhibit A). 2. A letter from the Maplewood Forest and Wildlife Society to Mayor Clymer and City Council informing them of and describing sensitive areas adjacent to the Maplewood subdivision (Exhibit B). • 3. A letter and Land Use map to Mary Lynne Myer from Steven Schwartz pointing out streams and a wetland behind his property that were not included in the wetland inventory (Exhibit C). 4. A hand written letter to Nicola Robinson, of the Maplewood Forest and Wildlife Society, from Ted Mallory describing the wildlife habitat associated with the wetland and surrounding area (Exhibit D). 5. A letter to Mary Lynne Myer, Principle Planner, from Philip Schneider, a habitat biologist with the Department of Wildlife, describing the wetland, creeks and upland habitat (Exhibit E). 6. A petition in support of preserving the Maplewood forest (Exhibit F). If you have any questions, please call David Saxen in Long Range Planning, 277-2475. a r- t i , .. t \ , - H hall a W .1i09 i� leY�1��'A ,7 ��alddw t r t* #i* v 1„, a• t,* A ♦ ♦ o rO151l�IQ�1L ♦f 1�r M xt* r xf♦♦ 3 ' • dapMTUVW �♦ • i 1r ■ 11 I A 1t M N 4 a4'11NAM all ' No11• !• x _ •�• ,fir '• # w 1. (Q4, M) • �4 ♦+i.Di x f c ii3M • • I a '.41:k zilkIc;ri-t. - d1`b4 • • _i_,• (W rw ,mow 5103j- Q�?101 SkILL--mhoC...inv V•a S?1 ?I hi �V W1 1v Sk IA N J Q Q U..Gr1 �)S a w �—S S -y • ' CE N a-tl3ci 03i-s3193 ` 4• ' S!1v1- saw-c n5-6 d W -�.5 N, h-nvnx)Ci Si UM(-1-Le I 1 4.4°P:414 4*-ihed- 717 44175' id2=7 11A(1 - 00- V7 'PO -1,a//.6/ ; III 411171.f 9-4 Pv/il Av.r d n7 nip 0.a • „A r 114.1f,./.1"rier—Jetfi 2/7-1 (r) /11 - 1, fterf / •f s pi 7 9 7L .ir --pAfp pp itow elyt 7e,'WO 71ff Or -711fri 41 •f• p-1171-rAll-7V777 1,49 g°,r741 Qf u#4.11.1 ifff. -COW:Ilk, 147 rig lueiv r6 "-111 r"fr7 :11 6,47c // 1r-1; )fi "2 ? 1 ?f rt 4, v f • T x --7-7)1-- NO1STAICI ONIC111rIS oou T Nnr --------- OJ33J (1//A CITY OF RENTON MEMORANDUM Date: June 14, 2000 To: Allen Quynn/Utility Systems Division riVJ From: Lesley Nishihira/Development Planning Subject: Revised Public Hearing date for Sunnydale Storm System Replacement Project No. LUA-00-071,V-H,ECF The Development Planning Section of the City of Renton has revised the public hearing date for the subject application. A presentation of the proposed amendment to the Environmental Review Committee (ERC) is scheduled for June 27, 2000. At that meeting, you will present staff recommendations for the Committee's review. and environmental determination. The date of Tuesday, July 18, 2000, at 9:00 AM, has been set for a public hearing to review the above- referenced project for which you are a design team member. The hearing, before Fred Kaufman, Hearing Examiner,will be held in the Council Chambers on the second floor of City Hall, Renton,Washington. The applicant, in this case the City, is required to be represented at the public hearing. A copy of the Preliminary Report to the Hearing Examiner will be made available to you one week before the hearing. hexmm Cit, :..:n Department of Planning/Building/It :..,,ts ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: pa ' COMMENTS DUE: JUNE 21, 2000 O APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 C 9 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley Nishihira Z O 0 PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 t»m CO LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street SITE AREA: .3 acre I BUILDING AREA(gross): m Z m SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental (SEPA) review,the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historic/Cultural Natural Resources Preservation Airport Environment 10,000 Feet 14,000 Feet so 6 B. POLICY-RELATED COMMENTS '] p �i�^Z /CJ C. CODE-RELATED COMMENTS 1710 t /(c)v)k, We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where dditional information is ded to properly assess this proposal. ad....__ 1/4 Signature of Director or Authorized Representative Date � l devapp Rev.10/93 CitSSon Department of Planning/Building/ rks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: Titre_ V-f...AA+1,(3-v\ COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGE slra re f V PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: ' 9 L� LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street JUN _ 8 2000 SITE AREA: .3 acre I BUILDING AREA(gross): SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated rr etal storm `t3iwn1 r3-inch hig i- density polyethylene pipe. The upper portions of the pipe will be below ground and the lover portion Iaipund. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Th +on ` ' " "PA) review, the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historic/Cultural Natural Resources Preservation • Airport Environment 10,000 Feet 14,000 Feet k B. POLICY-RELATED COMMENTS • C. CODE-RELATED COMMENTS lug We have reviewe this applicat with particular attention to those areas in which we have expertise and have identifed areas of probable impact or areas where ad ional inform.'n is needed to properly assess this proposal. Signature Di ector or Authorized -•epresentative Date devapp Rev.10/93 City!!'.on Department of Planning/Building/Ps�llc�irks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: 1,1sLIN � >}— . ttv— COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley Nishihira PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street SITE AREA: .3 acre I BUILDING AREA(gross): SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental(SEPA) review, the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historic/Cultural Natural Resources Preservation Airport Environment 10,000 Feet 14,000 Feet B. POLICY-RELATED COMMENTS • C. CODE-RELATED COMMENTS 0 COV141/l4e4/7, We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional infor ation is needed to properly assess this proposal. • b/ ,/C) Signature of Director or Authorized Representative Date devapp Rev.10/93 City Department of Planning/Building/ ENVIRONMENTAL 8 DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT: IN�IL i eAol .U- COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2i0I._ APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley ishihira PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 JUN 7 2000 LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street ECONOMIC DEEVral p Ndc,HgpRHOoDs:MI SITE AREA: .3 acre BUILDING AREA(gross): AN�STRaTEGfCPLAtr1NIN�, SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental (SEPA) review, the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services _ Energy/ Historic/Cultural Natural Resources Preservation Airport Environment 10,000 Feet 14,000 Feet B. POLICY-RELATED COMMENTS N ( i Ssv (6 rU Yt- s a l-r c 6'Lr3-7v,vi n/L C. CODE-RELATED COMMENTS We have revie is-app rJ ation with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas whe additional informstio is needed to properly assess this proposal. 6/N/a) Signatur o D're tor or Autfi rized Representative Date devapp Rev.10/93 filCit :—:an Department of Planning/Building/ is vvurks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT S\D6 a\--to-In COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley Nishil i LOPMENT SERVICES CITY0E-REN i U14 PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5''Street JUN O 2000 SITE AREA .3 acre I BUILDING AREA(gross): RECEIVED SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental (SEPA) review,the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ HistoriclCultural Natural Resources Preservation Airport Environment 10,000 Feet 14,000 Feet B. POLICY-RELATED COMMENTS C. CODE-RELATED COMMENTS No Co WM vlic1i14/� • We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additio al information is needed to properly assess this proposal. � 1J / GVG4 /7/.9 L) Signature of Director or Authorized Representative Date devapp Rev.10/93 Cif_ an Department of Planning/Building AIL vvoi-ks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT:Sk uts ��- COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley Nis Tf OPMENT SERVICES Mf OF RBI I UN PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street JUN 07 2000 SITE AREA: .3 acre I BUILDING AREA(gross): RECEIVED /ED SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental (SEPA) review, the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable. Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historic/Cultural Natural Resources . Preservation Airport Environment 10,000 Feet 14,000 Feet B. POLICY-RELATED COMMENTS C. CODE-RELATED COMMENTS We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is needed to properly assess this proposal. OZ4 k.17/0(1) Signature of Director or Authorized Representative Date devapp Rev.10/93 4,11, C .. ..ton Department of Planning/Building W_ ::irks ENVIRONMENTAL & DEVELOPMENT APPLICATION REVIEW SHEET REVIEWING DEPARTMENT:CMIS4111181,6-0. ge)(cc 6 COMMENTS DUE: JUNE 21, 2000 APPLICATION NO: LUA-00-071,ECF,V-H DATE CIRCULATED: JUNE 7, 2000 APPLICANT: City of Renton, Utilities Systems Div. PROJECT MANAGER: Lesley NisWLOPMENT SERVICES CITY OF RENTON PROJECT TITLE: Sunnydale Storm System Replacement WORK ORDER NO: 78699 LOCATION: Southwest of Sunnydale Mobile Home Park; North of SE 5th Street JUN 07 2000 SITE AREA: .3 acre BUILDING AREA(gross): RECEIVED SUMMARY OF PROPOSAL: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high- density polyethylene pipe. The upper portions of the pipe will be below ground and the lower portion will be above ground. The project site contains slopes in excess of 40%and is located within 25 feet of a creek. Therefore, in addition to environmental(SEPA) review, the proposal requires a Certificate of Exemption from the Critical Areas Regulations and a variance from the Tree Cutting,and Land Clearing Regulations. A. ENVIRONMENTAL IMPACT(e.g.Non-Code) COMMENTS Element of the Probable Probable More Element of the Probable Probable More Environment Minor Major Information Environment Minor Major Information Impacts Impacts Necessary Impacts Impacts Necessary Earth Housing Air Aesthetics Water Light/Glare Plants Recreation Land/Shoreline Use Utilities Animals Transportation Environmental Health Public Services Energy/ Historic/Cultural Natural Resources Preservation Airport Environment 10,000 Feet 14,000 Feet B. POLICY-RELATED COMMENTS • / min? C. CODE-RELATED COMMENTS We have reviewed this application with particular attention to those areas in which we have expertise and have identified areas of probable impact or areas where additional information is needed to properly assess this proposal. &(?4; ,'nature of Dir r o Authoriz Representage Date •evapp Rev.10/93 IMO #.0 - • CITY OF RENTON DEVELOPMENT SERVICES DIVISION" LIST OF SURROUNDING PROPERTY OWNERS within 300 feet of the subject site PROJECT NAME: SUNNYDALE DOWNSTREAM STORM SYSTEM REPLACEMENT PROJECT APPLICATION NO: L'A-OO •O`l I , V--{{ *LL The following is a list of property owners within 300 feet of the subject site. The Development Services Division will notify these individuals of the proposed development. NAME ADDRESS ASSESSOR'S PARCEL 1 NUMBER See Attached list of thirteen (1%)addresses. Applicant Certification I, ALLEN QUYNN , hereby certify that the above list(s) of adjacent property (Print Name) owners and their addresses were obtained from: ❑ Title Company Records x King County Assessors Records Signed Date 6800 (Applicant) NOTARY ATTESTED: S bscri d, and sworn before me, a Notary Public, in and for the State of Washington, residing at on the /54 day of 20 00 Signed 1 " (Notary Public) ****For City of Renton Use***, CERTIFICATION OF MAILING I, k - , hereby certify that a notice of the proposed applicatiofi, ;c sit a'irt Cfe tl� Nir'1G (City Employee) e `7;irv0 MARILYN c EFF �' 1 1U �. .. S. �� Date: .v�. t STATE OF WASHINGTON I'ECLII D COMMISSION EXPIRES NOTARY JUKE 20, 2003 A i�srli�_�e a rn before me, a Notary P blic, in and for the State of Washington residing at` . eery r, on the 1' 91 day of , 20 cl?o. ' Signed listprop.doc ANARtyN HADIVISION'S1U'il'Li"1`YL"SlM ilifi )% 512690005503 512690005008 162305901801 BEAL DAVID M+TERRI L CARLSON CARRENIA JO+JOHN L CITY OF RENTON 26018 SE 38TH CT 24322 147TH AV S E FINANCE ISSAQUAH WA 98027 KENT WA 98042 200 MILL AVE S RENTON WA 98055 162305904904 512690006006 512690004001 CITY OF RENTON DEADY TROY LEE DOBSON JOHN W ESTATE BENNETT W E 3436 SE FIFTH ST DOBSON WYMAN K P R 200 MILL AVE S RENTON WA 98055 PO BOX 59 RENTON WA 98055 RENTON WA 98057 512690006501 162305900308 512690004506 GOMES SAMUEL E+WISSLER COLL KING COUNTY LEISE RONALD E+GERALYNN M 2222 SAHALEE DR E 500A K C ADMIN BLDG 3412 SE 5TH ST REDMOND WA 98053 500 FOURTH RENTON WA 98058 SEATTLE WA 98104 512690007004 512690003003 512690003508 NELSEN KAREN NELSON E SUZANNE+DARRYL R STREIFEL JOHN J+MARION 0 3500 SE 5TH ST 3332 SE 5TH ST 3340 SE 5TH ST RENTON WA 98058 RENTON WA 98058 RENTON WA 98055 162305902205 162305904805 WEST COAST MGMT INC LA PIANTA,LLC • SUNNYDALE MOBILE HOME PARK PO BOX 88028 5339 PROSPECT RD#261 TUKWILA,WA 98138 SAN JOSE CA 95129 vtY O V Yt1 Comments on the above applicatio ed In writing to Lesley Nishihira,Project Manager,Development © + _ _ Services Division,1055 South Gra,II_-. .n VA 98055,by 5:00 PM on June 21,2000.This matter is also - ® scheduled for a public hearing on July 25,20110 el 9:00 AM,Council Chambers,Seventh Floor,Renton City Hall.1055.,,t� South Grady Way,Renton.If you are Interested in attending the hearing,please contact the Development Services r-4jA.rT0 I, Division,(425)430-7282,to ensure that the hearing has not been rescheduled.If comments cannot be submitted in writing by the dale indicated above,you may still appear at the hearing and present your comments on the proposal ! before the Hearing Examiner.If you have questlans about this proposal,or wish to be made a party of record and NOTICE OF APPLICATION receive additional information by mail,please contact the project manager.Anyone who submits written comments will AND PROPOSED DETERMINATION OF NON- automatically become a party of record and will be notified of any decision on this project. . SIGNIFICANCE(DNS) CONTACT PERSON: LESLEY NISHIHIRA(425)430.7270 I PLEASE INCLUDE THE PROJECT NUMBER WHEN CALLING FOR PROPER FILE IDENTIFICATION DATE: June 7,2000 LAND USE NUMBER: LUA-00-071,V-H,ECF t�—yI Ob. cf \ APPLICATION NAME: Sunnydale Storm System Replacement HE raw sr T `' PARK OR .tr" '�i PROJECT DESCRIPTION: The proposal Is to replace 700 feel of 18-inch corrugated metal storm pipe with a r NE rr cal , . new 18-inch high-density polyethylene pipe.The upper portions of the pipe will be below pound and the lower portion will CD '.mow R, be above ground.The project requires a Certificate of Exemption from the Critical Areas Regulations for work on slopes ® HT r°m St in excess of 40%and a variance from the Tree Cutting and Land Clearing Regulations to do work wilhin.25 feet of a A .i.gi rsin creek. ¢¢ N SIN sr PROJECT LOCATION: Southwest of Sunnydale Mobile Home Park;North of SE 5a Street N car `< S 'z z IP• >H z� "` �L.. d OPTIONAL DETERMINATION OF NON-SIGNIFICANCE(DNS):As the Lead Agency,the City of Renton has RT. < . P V z < ' determined that significant environmental impacts are unlikely to result from the proposed project.Therefore,as N am sr a �< permitted under the RCW 43.21 C.110,the City of Renton is using the Optional DNS process to give notice that a DNS is 1 d / g likely to be Issued.Comment periods for the project and the proposed DNS are integrated Into a single comment period. There will be no comment period following the Issuance of the Threshold Determination of Non-Significance(DNS).A sr 14-day appeal period will follow the Issuance of the DNS. Me.6m ° SC .m Sr s PERMIT APPLICATION DATE: June 1,2000 sr ?'o/ aso s+ ® NE NOTICE OF COMPLETE APPLICATION: June 7,2000 \ / /� + APPLICANT: City of Renton;Utility Systems Division;Surface Water Utility /\/� //� s.� V Section »+D sr !�„ sunLenwam ®R[ �[ OWNER: La Pianta,LLCIKing County/Bryan Heath ] s " `sC)- mill nA Permits/Review Requested: Environmental(SEPA)Review,Variance for Tree Cutting and Land h sc MN sr • 3 Clearing Regulations 3 i .'i� S em en 11111 . Other Permits which may be required: City of Renton Construction Permits,Hydraulic Project Approval(HPA) ` �.�l-8',m s% 1.. s N cr �` s> PROJECT permit from the Department of Fish and Wildlife M 6-W �- , LOCATION Requested Studies: Geotechnical Report I -, _ Locationdere application may ,I RENTON `E J be reviewed: Planning/Building/Public Works Division,Development Services Department, 1055 South Grady Way,Renton,WA 98055 ao,�rH�H PUBLIC HEARING: Public hearing scheduled for July 25,2000 before the Renton Hearing Examiner j a in Renton Council Chambers.Hearings begin a19:00 AM an the 7th floor of the ® se new Renton City Hall located at 1055 Grady Way South, `� H r�� CONSISTENCY OVERVIEW: o war Land Use: The subject site Is designated Residential Rural on the City of Renton's s a Comprehensive Plan Land Use Map and Resource Conservation on the City's , 1 . Zoning Map.The proposed replacement of the existing storm drain pipe Is a consistent with both of these land use designations. PROJECT TITLE: PROPOSE°WORK: Sunnydale Downstream Replace existing damaged pipe, Environmental Documents that Storm System Replacement Project structures,and eroding oulfall with Evaluate the Proposed Project: None. DIRECTIONS TO 517E ADJACENT PROPERTY OWNERS: new pipe,improved alignment and Take 1-405 South to Maple Volley King County outfall location,and energy Development Regulations Hwy.(5R169),East on SR169 la SHEET TITLE VICINITY MAP dissipater, Used For Project Mitigation: The project will be subject to the City's SEPA Ordinance,Sensitive Areas SE 5th. A maintenance accessroad t AT: Township 23N,Range 5E Ordinance,Zoning Code,Public Works Standards,Uniform Building Code, '^ west of SEe sasite is located just SCALE: NOT TO SCALE Section 16 Uniform Fire Code and other applicable codes and regulations as appropriate. V ASSISTANCE BY: Entrance. SHEET: 1 of 3 Y DATUM:City of Renton DRAWN BY: GLS DATE May 2000 Genmalot CERTIFICATION I, A h.a,Y-e-t De 3,u w , herlify certify that �) copies of the above document were posted by me in conspicuous places on or nearby the described property on . Zoao • Signed: 1Z, i __., ATTEST: Subcribed and sworn before me, a Nortary Public, in and r the State of Washington residing in 9'�'c2_,AS , on the l \f`" day of ;.,r_" , /�� .,r,.selr�0,. ..� - MAIRTYN � CHEFF z NOTARYPUBLIC 2� STATE OF INASHINGTON COMMISSION EXPIRES MARILYN KAMC . w. JUNE 2fl,2003 MY APPOINTMENT EXPIRES:6-29-03 """. - ' cop baL YP- • NOTICE OF APPLICATION • AND PROPOSED DETERMINATION OF NON • - SIGNIFICANCE (DNS) DATE: June 7,2000 LAND USE NUMBER: LUA-00-071,V-H,ECF APPLICATION NAME: Sunnydale Storm System Replacement PROJECT DESCRIPTION: The proposal is to replace 700 feet of 18-inch corrugated metal storm pipe with a new 18-inch high-density polyethylene pipe. The upper portions of the pipe will be below gound and the lower portion will be above ground. The project requires a Certificate of Exemption from the Critical Areas Regulations for work on slopes in excess of 40% and a variance from the Tree Cutting and Land Clearing Regulations to do work within,25 feet of a . creek. PROJECT LOCATION: Southwest of Sunnydale Mobile Home Park;North of SE 5th Street OPTIONAL DETERMINATION OF NON-SIGNIFICANCE(DNS): As the Lead Agency,the City of Renton has determined that significant environmental impacts are unlikely to result from the proposed project. Therefore,as permitted under the RCW 43.21 C.110,the City of Renton is using the Optional DNS process to give notice that a DNS is likely to be issued. Comment periods for the project and the proposed DNS are integrated into a single comment period. There will be no comment period following the issuance of the Threshold Determination of Non-Significance(DNS). A 14-day appeal period will follow the issuance of the DNS. PERMIT APPLICATION DATE: June 1,2000 NOTICE OF COMPLETE APPLICATION: June 7,2000 APPLICANT: City of Renton;Utility Systems Division;Surface Water Utility Section OWNER: La Pianta,LLC/King County/Bryan Heath Permits/Review Requested: Environmental(SEPA)Review,Variance for Tree Cutting and Land Clearing Regulations Other Permits which may be required: City of Renton Construction Permits,Hydraulic Project Approval(HPA) permit from the Department of Fish and Wildlife Requested Studies: Geotechnical Report Location where application may be reviewed: Planning/Building/Public Works Division,Development Services Department, 1055 South Grady Way,Renton,WA 98055 PUBLIC HEARING: Public hearing scheduled for July 25,2000 before the Renton Hearing Examiner in Renton Council Chambers. Hearings begin at 9:00 AM on the 7th floor of the new Renton City Hall located at 1055 Grady Way South. CONSISTENCY OVERVIEW: Land Use: The subject site is designated Residential Rural on the City of Renton's Comprehensive Plan Land Use Map and Resource Conservation on the City's Zoning Map. The proposed replacement of the existing storm drain pipe is consistent with both of these land use designations. Environmental Documents that Evaluate the Proposed Project: None. Development Regulations Used For Project Mitigation: The project will be subject to the City's SEPA Ordinance,Sensitive Areas Ordinance,Zoning Code,Public Works Standards,Uniform Building Code, Uniform Fire Code and other applicable codes and regulations as appropriate. Genmalot Comments,,on the above application must be in writing to Lesley Nishihira,Project Management Services Division, 1055 South Grady Way,Ril , A 98055,by 5:00 PM on June 21,2000. This , lso sche,duled for a public hearing on July 25,2000,at 9:00 AM,Council Chambers,Seventh Floor,Renton City Hall,1055 South Grady Way,Renton. If you are interested in attending the hearing,please contact the Development Services Division,(425)430-7282,to ensure that the hearing has not been rescheduled. If comments cannot be submitted in writing by the date indicated above,you may still appear at the hearing and present your comments on the proposal before the Hearing Examiner. If you have questions about this proposal,or wish to be made a party of record and ' receive additional information by mail,please contact the project manager. Anyone who submits written comments will automatically become a party of record and will be notified of any decision on this project. CONTACT PERSON: LESLEY NISHIHIRA (425)430-7270 PLEASE INCLUDE THE PROJr, ECT NUMBER WHEN CALLING FOR PROPER FILE IDENTIFICATION Izly , .., 11 NE 12TH Si a • krNEP PRE4R4' ,1z1 900 y0 w 4 2< O t z 900 NE 10TH Si y w< y=� z i SE 16TH 0Q ST z N 8TH ST z N to At W z z z z NE 1f1ST z. IPAL '� S� N OZ N RT < < o0 m JV - N6TH ST o O 5a Q I� W N O 6 B J ¢a and / 1 0 o 1 ,t N 4TH ST , / �' .o JP 405 NE 4TH ST S O N 3RD ST SS S SO V7 900 �• < ` V M O< ` f1 9 m w M ID ST '` /4103) AeF SUNNYDALE z MOBILE HOME D ST Inm< %.. 1.• PARK a S eF} z 0 z • z yGG__ SE STH ST 0 .1.< WO "Y E(/1 < N �, o 6THS ST T< �A •TH 57 ,.. m N�9Pcks--- \� ST PROJECT ✓✓11 LOCATION 41 sC 4 z N 15 s� RE T 0 �,yDAR N, SE 2 "r O� Se �PUGET S "O 0 a z 0 3 n 0W PROJECT TITLE: PROPOSED WORK: Sunnydale Downstream Replace existing damaged pipe, Storm System Replacement Project structures, and eroding outfall with ADJACENT PROPERTY OWNERS: new pipe, improved alignment and DIRECTIONS TO SITE: KingCountyoutfall location, and energy Take 1-405 South to Maple Valley dissipator. Hwy. (SR169), East on SR169 to SHEET TITLE: VICINITY MAP AT: Township 23N, Range 5E SE 5th. A maintenance access road to the site is located just SCALE: NOT TO SCALE Section 16 west of SE 5th. ASSISTANCE BY: Entranco SHEET: 1 of 3 o DATUM: City of Renton DATE: May 2000 '4 DRAWN BY: GLS •� . .,;. 111, CIIPOP OF RENTON — Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator June 7, 2000 Allen Quynn City of Renton Utility Systems Division 1055 South Grady Way Renton, WA 98055 SUBJECT: Sunnydale Storm System Replacement LUA-00-071,ECF,V-H Dear Allen: The Development Planning Section of the City of Renton has determined that the subject application is complete according to submittal requirements and, therefore, is accepted for review. It is tentatively scheduled for consideration by the Environmental Review Committee on June 27, 2000. Prior to that review, you will be notified if any additional information is required to continue processing your application. A public hearing will be held by the Renton Hearing Examiner at his regular meeting in the Council Chambers on the seventh floor of City Hall. On July 25, 2000 at 9:00 AM to consider the Variance. The applicant or representative of the applicant is required to be present at the public hearing. Please contact me, at (425) 430-7270, if you have any questions. Sincerely, gif6a1/1,9 Lesley Nishihira Project Manager cc: LaPinata LLC/King County/Bryan Heath/Property owners =ccptlr 1055 South Grady Way-Renton,Washington 98055 CITY OF RENTON : • DEVELOPMENT SERVICES DIVISION 'MASTER APPLICATION OWNER(S) • PROJECT'INFORMATION(cont) Note: If there is more than on legal owner,please attach an additional notarized TIN L Master application to each owne. EXIS G AND USE(S): i, ' STORM DRAIN PIPE NAME: LA PI A4A ADDRESS: 0 cgsKA PROPOSED LAND USE(S): City: 761‹ t,J A ZIP: 9 8),3e STORM DRAIN PIPE TELEPHONE NUMBER: — ca06 _ts`)3 aoc0 • CONTACT PERSON/APPLICANT EXISTING COMPREHENSIVE PLAN MAP DESIGNATION: RESIDENTIAL RURAL NAME: Allen Quynn, City of Renton, Utility Systems Div. Surface Water Utility Section PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION: ADDRESS: 1055 South Grady Way N/A EXISTING ZONING: City: Renton ZIP: 98055 RC—RESOURCE CONSERVATION TELEPHONE NUMBER: 425-430-7247 PROPOSED ZONING: PROJECT INFORMATION N/A SITE AREA(SQ.FT.OR ACREAGE): PROJECT OR DEVELOPMENT NAME: THE PROPOSED PIPELINE WILL COVER AN AREA . SUNNYDALE DOWNSTREAM STORM SYSTEM APPROXIMATELY 03 ACRES. REPLACEMENT PROJECT PROJECT VALUE: $150,000.00 PROPERTY/PROJECT/ADDRESS(S)/LOCATION: IS THE SITE LOCATED IN THE AQUIFER PROTECTION AREA? SEE LEGAL DESCRIPTION. NO KING COUNTY ASSESSOR'S ACCOUNT NUMBER: SEE ATTACHED ç3 656161-ie IS THE SITE LOCATED IN ANY OTHER TYPE OF ENVIRONMENTALLY SENSITIVE AREA? SEE ATTACHED"PROPERTY IDENTIFICATION YES, THE SITE OR PORTIONS OF THE SITE HAVE LISTING". BEEN CLASSIFIED AS WITHIN THE SENSITIVE AREAS: STEEP SLOPES, SEISMIC, SLIDES, EROSION AND STREAMS. DEVELOPMENT PLANNING CITY oF Rpm-rnm JUN 0 1 MO LiCaniElt HADIVISION.S\UTILITIE.S\DOCS\2000-237.doc\a LEGAL DESCRIP N OF PROPERTY(Attach sepa te sheet if needed) The project is located in the SE quarter(1/4)of Section 16,Township 23N,Range 5E. The upper end of the project is at the Southeast corner of the Sunnydale Mobile Home Park. The lower end of the project is near the intersection of SE 5th Street and Newport Ave. SE,North of Maple Valley Hwy. The City has three existing drainage easements within the project limits(see attached easement legal descriptions). Two of the easements are with King County and are designated Easement"A"and Easement"B". The third easement is with the Estate of John C.Edwards,the Estate of Anna G.McMahon and the Rainier Sand and Gravel,Inc. The property is now under the ownership of LA Pianta LLC. TYPE:OF APPLICATION & FEES Check all application types that apply--City staff will determine fees: _ANNEXATION $ SUBDIVISION REZONE $ _SPECIAL PERMIT $ _LOT LINE ADJUSTMENT $ _TEMPORARY PERMIT $ _SHORT PLAT $ _CONDITIONAL USE PERMIT $ TENTATIVE PLAT $ SITE PLAN APPROVAL $ _PRELIMINARY PLAT $ GRADE&FILL PERMIT $ _FINAL PLAT $ (No.Cu.Yds: ) X VARIANCE $ (from Section:4-4-130) $ 250.00 PLANNED UNIT DEVELOPMENT $ WAIVER $ PRELIMINARY _ROUTINE VEGETATION _FINAL MANAGEMENT PERMIT $ _BINDING SITE PLAN MOBILE HOME PARKS $ SHORELINE REVIEWS: _SUBSTANTIAL DEVELOPMENT $ _CONDITIONAL USE $ _VARIANCE $ _EXEMPTION $ X ENVIRONMENTAL REVIEW $ 1,000.00 REVISION , AFFIDAVIT OF OWNERSHIP I,(Print Name) M.P.K P. ALE ,declare that I am(please check one) _the owner of the property involved in this application, x the authorized representative to act for the property owner(please attach proof of authorization),and that the foregoing statements and answers herein contained and the information herewith are in all respects true and correct to the best of my knowledge and belief. I certify that I know or have satisfactory evidence that M4rZe- A • ,signed �� �• `� this instrument and acknowledged it to be his/her/their free and volun1 dct tE RKh 1 f�lf• CZ) L��O OU.C� N l 3 L, purposes mentioned in the ins ment. v`P g\ON�,•.s�`Ii� �1 tNiPa GEV„, 7oh.i i �O=•`� TARYLO� p)of (Name o Owner/Represe tive) Notary Public in and for the State of W• �i b on :p VI Cl): f PUBS-G Notary(Print) Lt i i —G• F1i iil►V 6S / `5(Signature of Owner/Re rese ative) My appointment expires: - 9 i Q t�[ i �i ,9•••.` .9'0�`••• /K KK aa. '%%,OFwws �11J I.C. �QJG r` ! H:\DIVISION.S\UTILITIE.S\DOCS\2000-237.doc\a i01 m-0it ECF EGTION TO`BESHPL COMPLECU TED BY CITY STA City File N5mber: SA R LLA PP FP TP SP RVMP / ✓�' " W FPUD SM. SME ;. MHP BSP A� CPA TOTAL FEES"$: t �a TOTAL POSTAGE PROVIDED:.$ "t1 f, H:\DIVISION.S\UTILITIE.S\DOCS12000-237.doc\a MAY-24-2000 10:06 CITY OF RENTON PBPW 425 430 7241 P.02/03 I OF RENTON • • ' DEVELOPMENT SERVICES TTIVISOO • • • MAS TER:APPLIC�• �T :.. . OwNE (s)• INFORMATION(coiitj• • • N9*e_• .If here is more.tlran:on Ibgai owner,p]aase attach ari.'additional.notarized• EXISTING LAND USE(S),Master application to•each owner. STORM DRAIN PIPE NAME: y_t til' Leak l\ . ADDRESS: •t= �bU � PROPOSED LAND USE(S): City: S ` l t ZIP: etch�U STORM DRAIN PIPE TELEPHONE NUMBER: - 2 l(v Lt c/_ CONTACT.PERSON/APPLICAN '••+ : • •': EXISTING COMPREHENSIVE PLAN MAP DESIGNATION: RESIDENTIAL RURAL NAME: Allen Quynn,City Of Renton, Utility'Systems Div. Surface Water Utility Section. T` PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION: ADDRESS: 1055 South Grady Way . N/A EXISTING ZONING: City: Renton ZIP: 98055 • RC--RESOURCE CONSERVATION TELEPHONE NUMBER: 425-43077247 , , PROPOSED ZONING: N/A PROJECT INFOEMATION; ... ••;;; •• SITE AREA(SQ.FT.OR ACREAGE): PROJECT OR DEVELOPMENT NAME: THE PROPOSED PIPELINE WILL COVER AN AREA SUNNYDALE DOWNSTREAM STORM SYSTEM APPROXIMATELY .03 ACRES. REPLACEMENT PROJECT PROJECT VALUE: PROPERTY/PROJECT/ADDRESS(S)ILOCATION: $I50,000.00 , IS THE SITE LOCATED IN THE AQUIFER PROTECTION AREA? SEE LEGAL DESCRIPTION. NO KING COUNTY ASSESSOR'S ACCOUNT NUMBER: , .. SEE ATTACHED IS THE SITE LOCATED IN ANY OTHER TYPE OF ENVIRONMENTALLY SENSITIVE AREA? SEE ATTACHED"PROPERTY IDENTIFICATION YES,THE SITE OR PORTIONS OF THE SITE HAVE LISTING". BEEN E TIEV AREAS: STEEPCLASSIFIED SLOPESASWITHIN, SEISMICTH,SLIDESSENSI, EROSION AND STREAMS. H:\DNLSION.S\UTILITIE.SIDOCS12000-237.doc\a MAY-24-2000 10:06 CITY OF RENTON PBPW 425 430 7241 P.03/03 ' LEGAL DESCRIP•. F PROPERTY(Attach separilibetif needed) ,The project is located in the SE quarter(1/4)of Section.16,Township 23N,Range SE.The upper end of the project is at the Southeast corner of theSunnydale Mobile Home Park. The lower end of the project is near.the intersection of SE 5'h Street and Newport Ave. SE,North of Maple Valley Hwy, . The City has three existing drainage easements within the project limits(see attached easement legal descriptions). Two of the easements.are with King County and are designated Easement"A"and Easement"B". The third easement is with the Estate of John C.Edwards,the Estate of Anna G,McMahon and the Rainier Sand and Gravel,Inc. The property is now under the ownership of LA Pianta LLC. . . TyPE.OF APPLICATION &• .iftts . • :Check all:application.types that•:apply:4:City'staff:will..determin e ees.. • _ANNEXATION .$ ' SUBDIVISION • REZONE •- . $ • SPECIAL PERMIT $ LOT LINE ADJUSTMENT $ . TEMPORARY PERMIT $ • SHORT PLAT $ CONDITIONAL USE PERMIT $ _TENTATIVE PLAT $ . —SITE PLAN APPROVAL $ • _PRELIMINARY PLAT ' $ _GRADE&FILL PERMIT $ . — —FINAL PLAT $ • (No.Cu.Yds: ) X VARIANCE • $ (from Section:4-4-130) ' $ • 250.00 • ' PLANNED UNIT DEVELOPMENT $ —WAIVER $ _ _PRELIMINARY —ROUTINE VEGETATION FINAL MANAGEMENT PERMIT $ — _BINDING SITE PLAN - ' .MOBILE HOME PARKS $ SHORELINE REVIEWS: • _SUBSTANTIAL DEVELOPMENT $ _CONDITIONAL USE $ VARIANCE • S EXEMPTION $ _ X ENVIRONMENTAL REVIEW S 1,000.00 REVISION ' ' • .:: ; AFFIDAVIT:O.P O''VVNERSHIP . .•• • I,(Print Name) / Y. t AJ t(X Vet A @ declare that I am(please check one), the owner of the property involved in this application, the authorized representfidie to act for the property owner(please attach proof of authorization),and that the foregoing statements and answers herein contained and thy information herewith are in all respects true and correct to the best of my knowledge and belief. 0 I certify that I know or have satisfactory evidence that ba\it0A % i e e,t eino+signed this instrument and acknowledged it to be his/her/their free and voluntary act fr the uses and ..,ypurposes m ,eel Ft3 i iif tyre 4 \t t t t t t r t r r}},„° °° . U* I'd /'# j : 4 � `L. ! .. �•I.Ale: Al •(Name of Oner/Repres e) , Notarye�l'ub tq�r t%e n nngton w ,d 1st r • / " ` ` ten' `e 11 `^ G‘ 0 TA r Nota�(Prim ,v �T s lf�x ('; , �'P U Si�F 1 \1 ,, , (Signature of Owner/Represcntativc) My ai► 't u L I: !03 =C e f f 11 y 7: d:-.Y" '•,,,,, VP I SM` \e0\ .a`` •• F tDIVISION,SIUTILITIE,S\DOCS12000-237.doc\a �'its/in t t°t t o TOTAL P.03 CITY OF:RENTON • DEVELOPMENT SERVICES:DIVISION MASTER APPLICATION OWNER(S) PROJECT INFORMATION(cont) Note:.,If there is more than on legal owner,please attach an,additional notarized EXISTING LAND USE(S): Master application to each owner. STORM DRAIN PIPE NAME:3r�?Ar\ j I1^a1� ADDRESS: ? ! l rdsr s"+ PROPOSED LAND USE(S): City: 4,.. ZIP: viS`z.7 STORM DRAIN PIPE TELEPHONE NUMBER: — CONTACT.PERSON/APPLICANT. EXISTING COMPREHENSIVE PLAN MAP DESIGNATION: RESIDENTIAL RURAL NAME: Allen Quynn, City of Renton, Utility Systems Div. Surface Water Utility Section PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION: ADDRESS: 1055 South Grady Way N/A EXISTING ZONING: City: Renton ZIP: 98055 .. RC—RESOURCE CONSERVATION ... TELEPHONE NUMBER: 425-430-7247 PROPOSED ZONING: PROJECT INFORMATION N/A SITE AREA(SQ.FT.OR ACREAGE): PROJECT OR DEVELOPMENT NAME: THE PROPOSED PIPELINE WILL COVER AN AREA SUNNYDALE DOWNSTREAM STORM SYSTEM APPROXIMATELY .03 ACRES. REPLACEMENT PROJECT PROJECT VALUE: PROPERTY/PROJECT/ADDRESS(S)/LOCATION: $150,000.00 IS THE SITE LOCATED IN THE AQUIFER PROTECTION AREA? SEE LEGAL DESCRIPTION. NO KING COUNTY ASSESSOR'S ACCOUNT NUMBER: SEE ATTACHED IS THE SITE LOCATED IN ANY OTHER TYPE OF ENVIRONMENTALLY SENSITIVE AREA? SEE ATTACHED "PROPERTY IDENTIFICATION YES, THE SITE OR PORTIONS OF THE SITE HAVE LISTING". BEEN CLASSIFIED AS WITHIN THE SENSITIVE .. . -• AREAS: STEEP SLOPES, SEISMIC, SLIDES, EROSION AND STREAMS. • • H:\DI VISION.S\UTILITIE.S\DOCS\2000-237.doc\tb • LEGAL :OF PROPERTY (Attach sep to sheet if needed) The project is located in the SE quarter(1/4) of Section 16, Township 23N,Range 5E. The upper end of the project is at the Southeast corner of the Sunnydale Mobile Home Park. The lower end of the project is near the intersection.of SE 5th Street and Newport Ave. SE,North of Maple Valley Hwy. The City has three existing drainage easements within the project limits (see attached easement legal descriptions). Two of the easements are with King County and are designated Easement"A"and Easement"B". The third easement is with the Estate of John C. Edwards,the Estate of Anna G. McMahon and the Rainier Sand and Gravel, Inc. The property is now under the ownership of LA Pianta LLC. TYPE OFAPPLICATION & FEES • Check all application types that apply -- City staff will determine fees. _ANNEXATION $ SUBDIVISION _REZONE $ _SPECIAL PERMIT $ _LOT LINE ADJUSTMENT $ _TEMPORARY PERMIT $ _SHORT PLAT $ CONDITIONAL USE PERMIT $ _TENTATIVE PLAT $ _SITE PLAN APPROVAL $ _PRELIMINARY PLAT $ _GRADE&FILL PERMIT $ _FINAL PLAT $ (No. Cu. Yds: ) X VARIANCE $ (from Section:4-4-130) $ 250.00 PLANNED UNIT DEVELOPMENT $ WAIVER $ _PRELIMINARY _ROUTINE VEGETATION _FINAL MANAGEMENT PERMIT $ BINDING SITE PLAN MOBILE HOME PARKS $ SHORELINE REVIEWS: _SUBSTANTIAL DEVELOPMENT $ _CONDITIONAL USE $ VARIANCE $ _EXEMPTION $ X ENVIRONMENTAL REVIEW $ 1,000.00 REVISION • AFFIDAVIT OF OWNERSHIP I, (Print Name) t } � declare that I am(please check one) the owner of the property involved in this application, a,uthorized representative to act for the property owner(please attach proof of authorization),and that the foregoing statements and answers herein contained and the information herewith are in all respects true and correct to the best of my knowledge and belief. I certify that I know or have satisfactory evidence that Sr V.41 HeA44.1 signed this instrument and acknowledged it to be us free aAd voluntary act for the uses and l l purp s s mentioned in the instrument. (Name of er/Rep ntative) Notary Public in and for the State of n l/�/ 44457 s Notary(Print) Kt{� (Sou- - (Signatur f Owne/Repr entative) My appointment expires: oz 349.ZDp/ • :Ccimmisslortk 1144555 }�P I1b1 Cq fps, H:\DIVISIONS\UTILITIES\DOGS\2000-237.doc\tb• t _- vsTRiiTl,rd;�?5 v�131D4 ,` Y�f' . • ----iir- a 5339 Prospect Rd. Suite 261 • San Jose Ca. 95129 • • .iii'l;:•;i;:i;;i.;,Z;:;::;N:ci:-Sli;:Ti';::;;;:;;;i:ii:i;;I•li;i:!iAN'' • M§t-- !•:.!!e''' it.• -'..1\4:in- - - H'"'i:T: ::k::':::::::.!!-!:::'*- -: :i:1:!::;! ':E.::::::;!:':.!; :::1:;:i!!! !:::!!!!!:•!1!:!1:: :;;!iR!!-!•!!!:'::::::;•; ii::' ":! •!:•::: :::i ilil . .. . „ . . . . • • .. . • •• .. •••• " ••• • . . . ..... . RE: Sunnydale Manufactured Housing Community,Renton Washington July 11,2000 City of Renton Attn: Allen Quynn Project Manager/Surface Water Utility 1055 S. Grady Way Renton,Wash. 98055 Dear Allen Quynn and City of Renton etal: ' Please find attached the executed master application for the stormwater pipe project for the :::"Sunnydale Downstream Storm System Replacement Project" :Thiwantiitii:again reiterate the position of Sunnydale Mobilehome Community and West Coast • . Management etal. Mr. John Woodring and our office have expressed verbally and in writing that ::Slum dal d West Coast Management etal. will NOT bear any financial obligation now or in the ... fiitinei Tor:the work done in reference to this application and associated correspondences regarding such work'. Wei will not reimburse the City of Renton and/or its associated departments or any affiliates etc. in any way for or because of the work referenced within this letter and or application. My signature(on the attached application)is conditioned upon the City of Renton and Allen Quynn acknowledging the afore noted facts, especially the fact that we (Sunnydale and/or West Coast Management and/or Bryan Heath and/or any of our affiliates) Will NOT now or ever reimburse the City of Renton (or any of its associated affiliates) in any form. If this correspondence is unclear please contact Mr. John Woodring for clarification and do not proceed with the storm system work until you(the City of Rental etal)understand this letter and its implications for the City of Renton Sincerely; i71 Brya • or S ydale Manufactured Housing Community 4110 May-31-00 04: 27A 1'"- "1 s, III • John E. Woodring Attorney at Law State & Sawyer Building, Suite 201 2120 State Avenue N.E. Olympia, Washington 98506 (360) 754-7667 FAX (360) 754-0249 SENT VIA FACSIMILE 4(425) 430-7241 ORIGINAL MAILED May 31, 2000 Allen Quynn Engineer city of Renton 1055 South Grady Way Renton, WA 98055 Re: 5unnvdale Mobile Home Park - Development Services Division Master Application Dear Mr. Quynn: Pursuant to your request I am sending the faxed Affidavit of Ownership signed by Sunnydale Park owner Buyan Heath for the City of Renton Master Application for the stormwater pipe work at Sunnydale Mobile Home Park and adjoining property. My client has requested that his signature on this document is exclusively for the purposes of affidavit of ownership of his property which is one of the properties where the stormwater pipe maintenance and repair work will take place. He and I are under the impression that in no way does his signature on this document commit him as the Park owner to any financial responsibility for the stormwater maintenance and repair activities that are the subject of this application. If this impression is incorrect, ,please so advise. My client's signature is contingent upon the" above understanding. I understand you will be transmitting to me in the immediate future correspondence indicating the stormwater retention facilities in the Park are in proper working order. This correspondence will not relate to the stormwater pipe on the Park property that will be replaced until the subject master application. Thank you for your consideration. Sincerely, J (../ OHM E./WOODRING Attorney at Law JEW:da Attachment cc: Bryan Heath via facsimile Gail Roy via facsimile SECTION TO BE COMPLETED BY CITY STAFF:) " City File Number`. ECF SA; R: SHPL CU LLA PP FP" TP SP RVMP. V AAD : W FPUD .'" SM SME MHP.: BSP :A : CPA TOTAL FEES: $. TOTAL POSTAGE PROVIDED:$ • H:\DIVISION.S\UTILITIE.S\DOCS\2000-23 7.doc\a FREDERICK V BETTS LAW OFFICES PETER D.BALCH JOHN P BRAISLIN ROBERT M COHON TRACY L.BROWN BETTS, PATTERSON & MINES, P.S. MARTIN T.COLLIER PAUL D CAREY MEREDITH A COPELAND WILLIAM P.FITE THE FINANCIAL CENTER CHARLES W.DAVIS CARL H HAGENS ELSA R.DURHAM INGRID W.HANSEN 1215 FOURTH AVENUE FRANCIS S.FLOYD BRUCE H HURST STEVEN GOLDSTEIN S THOMAS MAGNUSON SEATTLE, WASHINGTON 98161-1090 JEFFREY C.GRANT MICHAEL MINES DAVID L.HENNINGS JOHN C PATTERSON (206) 292-9988 KENNETH S.McEWAN DALE RIVELAND TELECOPIER: (206) 343-7053 JAMES D.NELSON CHRISTOPHER W TOMPKINS KIM C.PFLUEGER LIVINGSTON WERNECKE DOROTHY B.RICHARDSON JAMES P SOLIMANO June 18 , 1984 W. R.McKELVY 119721 F.B.FITE 119691 Eng.Dn,s,n r" City of Ream, Robert E. Bergstrom -� � • � d Engineering Supervisor Engineering Department City of Renton 200 Mill Avenue South rJUN 1 9 1986 Renton, Washington 98055 Re: McMahon/City Drainage and Maintenance Agreement Dear Bob: Enclosed herewith you will find a fully executed original of the Drainage and Maintenance Agreement, which our client has authorized to be delivered to you. The new page 2 has been initialed and made a part of the agreement. In your letter of May 17 , 1984 , you referred to the request of King County Public Works that the alignment of the off site drainage ditch be modified slightly to jog on to the McMahon property. To accommodate this change, you added a 30-foot strip to the legal description set forth on page two of the agreement. Based upon your explanation of the County' s requirements and our visit to the site on June 15 , 1984 , our client has approved the request. Our primary concern was that the realignment of the drainage ditch onto the McMahon property would not impair the future development of that parcel. You indicated that • there would be no difficulty constructing a drainage pipe as opposed to a ditch , or paving over the area, so long as access- to the drain was maintained to enable the City to perform its maintenance function. This arrangement is satisfactory to our client. As far as we know, this concludes the matter of the Drainage Maintenance Agreement. We would very much appreciate it if you would advise the Issaquah office of the Department of Natural Resources that the agreement has been concluded, and that the City will he performing the maintenance in the Robert E. Bergstrom -2- June 18 , 1984 future . The Department had expressed some concern about the drainage problem in the area behind Mrs . McMahon' s former residence, and it would be helpful to us if you- would advise the Department that the situation is now under control . Most sincerely, 7-75-2) Jdh P, in JPB: jsk Encl. ` cc: Thomas F. McMahon DRAINAGE AND MAINTENANCE AGREEMENT IL THIS AGREEMENT made and entered into this ..5 ) day of /Irv% , , 1984, by and between THOMAS F. McMAHON, Personal Representative of the Estate of John C. Edwards and the Estate of Anna G. McMahon, Deceased, and Rainier Sand and Gravel, Inc. , a Washington corporation, (hereinafter referred to collectively as "Grantor") , and THE CITY OF RENTON, a municipal corporation, (hereinafter referred to as "Grantee") . WITNESSET H: WHEREAS, Grantor is the owner of certain real property in tl?e City of Renton, and more particularly described herein, upon which is located a temporary storm drainage system for the purpose of draining surface water from surrounding property; and WHEREAS, The City of Renton is desirous of obtaining a right of entry onto Grantor's property for the purpose of maintaining, operating, repairing and replacing said drainage system; and WHEREAS, Grantor is willing to grant the City of Renton a right of entry upon the terms and conditions hereinafter set forth. NOW, THEREFORE, in consideration of the mutual covenants and agreements herein contained, the parties agree as follows: 1. Grantor, by this agreement, does hereby grant to Grantee a right of access over, through, across and upon the real property hereinafter described, for the purpose of maintaining, operating, repairing, altering, replacing, or reconstructing an existing storm drainage system with all necessary appurtenances. Said property is located in the City 1 of Renton, King County, Washington, and is more particularly described as follows: A parcel of land situate in the SW 1/4 of Section 16, Township 23 N, Range 5 E, more particularly described as follows: The S. 150.00' of the NE 1/4 of the SW 1/4 of Section 16, Township 23 N, Range 5 E, W.M. , King County, Washington. TOGETHER with the S 150.00' of the E 440. 00' of Govern- ment Lot 1, Section 16, Township 23 N, Range 5 E, W.M. , King County, Washington. TOGETHER with the N 70.00' of the E 440.00' of Govern- ment Lot 2, Section 16, Township 23 N, Range 5 E, W.M. , King County, Washington, less SR-169. TOGETHER with the east 350.00 feet of the west 850.00 feet of the north 30 feet of the SW 1/4 of the SE 1/4 of Section 16, Township 23 N. , Range 5 E, Willamette Meridian, King County, Washington. 2. In consideration for the right of access herein granted, Grantee agrees, at its own cost and expense, to operate, maintain, repair, alter, replace and reconstruct the said storm drainage system, and do all things necessary to keep said drainage system open and properly functioning at all times. This includes, without limitation, the cleaning of the drainage ditch, the maintenance of pipes and culverts, and removal of silt from the ditch and siltation ponds as may be reasonably •required from time to time. 3. Grantee shall have the right, without prior institution of any suit or proceedings at law, at such times as may be necessary, to enter upon said property for the pur- pose of operating, maintaining, repairing, altering, replacing or reconstructing said storm drainage system or making any connections therewith, without incurring any legal obligation or liability on account of such entry, provided, however, that such entry and all work performed pursuant to this agreement shall be accomplished in a workmanlike manner, and in a way which will not disturb, damage or destroy the improvements on the property. In the event any of the improvements are disturbed, damaged or destroyed, Grantee agrees to immediately 2 E;...TF 1 restore the same to the condition such improvements were in prior to Grantee's entry upon the property. 4. Grantee shall provide reasonable notice to Grantor prior to entering the property or performing work thereon. Grantee agrees to keep the property free of liens or encumbrances arising out of any of the work performed on the property pursuant to this agreement. Grantee further agrees to indemnify and hold harmless Grantor from and against any and all liability, claims, demands, actions or causes of action whatsoever, for personal injury, property damage or otherwise, arising out of or in any way relating to any of the work performed by Grantee pursuant to this agreement. 5. Grantor shall retain the right to use the surface of the drainage ditch, so long as said use does not interfere with storm drainage and so long as no permanent buildings or structures are erected on or over said drainage ditch. 6. Grantor and Grantee acknowledge that the existing drainage system located on Grantor's property is a temporary system which may be substantially altered or eliminated entirely at such time as the subject property is developed. Nothing herein contained shall be construed nor is intended to be construed as in any way preventing or precluding Grantor from developing the subject property, provided the existing drainage system is maintained, a suitable replacement drainage system is constructed, or surface water drainage is otherwise adequately provided for in a manner consistent with applicable state and local laws and ordinances. 7. This agreement shall be binding upon and the benefits thereof shall inure to the parties, their heirs, successors, assigns and personal representatives. 3 IN WITNESS WHEREOF, the parties hereto have set their hands the day and year first above written. GRANTOR: ESTATE OF JOHN C. EDWARDS BY C�-r�• rzyl�a Thomas F. McMahon, Administrator ESTATE OF ANNA G. McMAHON By c� -a-y^-e.d .r S 1 l' fli,4_ Thomas F. McMahon, Executor RAINIER SAND AND GRAVEL, INC. BY ca-Qer»rc-to �' Y1(\`Y14" C Its President GRANTEE: THE CITY OF RENTON By f.,(4t-c L,'7 G- " " STATE OF WASHINGTON ) ss. COUNTY OF KING ) On this 3Q day of /C , 1984, before me personally appeared THOMAS/F. McMAHON, to me known to be the individual described in and who executed the within and foregoing instrument, and acknowledged that he signed the same as his free and voluntary act and deed for the uses and purposes therein mentioned. GIVEN under my hand and official seal the day and year first above written. Z/Il��� jai. NOTARY PUBLIC ! arfd for the tat of Washingtozi, residing at F"�r- W / STATE OF WASHINGTON ) ss. COUNTY OF KING ) On this �'"�O day of aP, f , before me, the undersigned, a Notary Public rn and for the State of Washington, duly commissioned and sworn, personally appeared THOMAS F. McMAHON and to me known to be 4 . 1. the President and , respectively, of RAINIER SAND AND GRAVEL, INC. , the corporation that executed the foregoing instrument, and acknowledged the said instrument to be the free and voluntary act and deed of said corporation, for the uses and purposes therein mentioned, and on oath stated that ht• p authorized to execute the said instrument and that the seal affixed is the corporate seal of said corporation. WITNESS my hand and official seal hereto affixed the day and year first above written. ..---' / NOTARY PUBLIC: m aria for the.State of Washington', residing at l V/2-4- / 5 • • 8 _ 141 #n567 D STORM DRAINAGE EASEMENT RECO F .00 CPSHEL *****.00 55 This agreement made this llth day of February , 19 85 , by and between King County, a political subdivision of the State of WasFiii ton, hereinafter termed the Grantor, and the City of Renton , hereinafter termed the Grantee. WITNESSETH: That for and in consideration of mutual benefits, the Grantor herein does by these presents grant unto the Grantee, its successors and assigns, easements and right of way over, through, under, across and upon the following described property, situated in King County, Washington, to wit: EASEMENT "A" That portion of the Northwest 1/4 of the Southeast 1/4 of Section 16, Township 23 North, Range 5 East, W.M., King County, Washington, being a strip of land 15 feet in width having 7.50 feet on each side of the centerline described as follows: COMMENCING at the Southeast corner of said subdivision; thence N 1°04'23" E along the East line thereof 170.21 feet to the POINT OF BEGINNING of said easement and centerline; thence S 55°41'00" W 50.00 feet; thence S 78°00'00" W 87.00 feet; thence N 80°00'00" W 150.00 feet; thence S 67°40'00" W 195.00 feet; thence S 53°37'48" W 112.05 feet; to the South line of said subdivision and the terminus of said centerline. NPurpose: Easement "A" The Grantee shall have the right to construct, 0 reconstruct, operate, maintain, and repair its storm drainage pipe line with necessary appurtenances over, under and upon the above described strip of N land. 0 OD EASEMENT "B" That portion of the Northwest 1/4 of the Southeast 1/4 of Section 16, Township 23 North, Range 5 East, W.M., King County, Washington, being a strip of land 40 feet in width described as follows: The South 40.00 feet of the West 800.00 feet of the Northwest 1/4 of the Southeast 1/4 of Section 16, Township 23 North, Range 5 East, W.M., King County, Washington. Purpose: Easement "B" The Grantee shall have the right to construct, reconstruct, operate, maintain, and repair an open storm drainage ditch and service road within the above described•strip of land. The Grantor and Grantee herein, by accepting and recording this easement mutually covenant and agree to the terms and conditions described in detail in Appendix "A" attached hereto and by this reference made part of this agreement. DATED this llth day of February , 1985 • cob_z KING COUNTY, WASHINGTON en in-,r._ BY I-• cv —W Randy Re •1le ltJ �c:U TITLE "' ;..^ Gounty Executive '..ice . STATE OF WASHINGTON) COUNTY OF KING ) ss / / /' On this day personally appeared._before me lj'ie.e�J 7 - 1,v S 1 to me known to be the County Executive ofQii,Kg County, Washington, the person who signed the a o and foregoing instrument for King County for the uses and purposes therein stated and acknowledged to me that he signed the same as the free and voluntary act and deed of King County and that he was authorized to so sign. p 1 GIVEN under my hand and official seal this a% zz day ofa.Aiz y, s, 19gE. 1 an •: or ie • State of Washington residing • at..,2)44_ v!.1 44!..___ . CITY OF RENTON BY 1'OJ`OGrcJ i,5 0(,P/�, ... Barbara Y. Shinpoch TITLE Mayor I` • DATE February 8, 1985 CD ATTEST/gym�i�c¢J o d� U7 STATE OF WASHINGTON) City Clerk in COUNTY OF KING ) ss N • O On this day personally appeared before me a v_ Sh i n nc-h and axine Motor in to me known to be the person:who signed the above and foregoing Instrument for OD the uses and purposes therein stated and acknowledged to me that he signed the same as the free and voluntary act and deed of the Representative of City and that he was authorized to so sign. • GIVEN under my hand and official seal this' 8th day of February , 1985 . ____ 5 -e/ ^ • i AR in an or the State f �. ington residing • j at ad/-o D APPROVED AS TO FORM & LE ITY: BY De uty-P o Jtin toce DATE U io• • • APPENDIX "A" Terms and conditions applicable to easements "A" and "B" granted by King County. 1. PERMIT REQUIRED: Before any work is performed under this agreement, Grantee must obtai a right of way construction permit or a special use permit from the Real Property Division. To obtain said permit, Grantee shall submit complete plans and specifications of the proposed project including details of landscaping, and comply with any and all other provisions as more specifically set forth in the permit application. 2. DAMAGES: In the event that any damage of any kind is caused by Grantee in the course of performing any act authorized by this easement, Grantee shall immediately reimburse the damaged party to the full extent necessary to restore said party to the position he would have held absent said damage. 3. ASSESSMENTS: Neither Grantor, nor its property shall be subjected to any charge, assessment or expense arising from, growing out of, or in any way attributable to, the use, occupance, or actions authorized herein, whether within or without the confines of Grantor's property. If Grantor or its property is legally subjected to any such charge, assessment or expense, Grantee shall pay Grantor, as additional compensation for the rights granted in this instrument an amount of money equal to any such charge, assessment or expense paid by the Grantor. 4. HOLD HARMLESS: The Grantee agrees to protect and save King County, its electi and appointed officials and employees while acting within the scope of their duties as such, harmless from and against all claims, demands and 0 causes of action of any kind or character, including the cost of defense thereof, arising in favor of the Grantee's employees or third parties on account of personal injuries, death or damage to property arising out of the premises herein or in any way resulting from the acts or omissions of the Grantee and/or its agents, employees or representatives. 5. HIRING AND EMPLOYMENT: In all hiring or employment made possible or resulting rom tl-iis agreement, there shall be no discrimination against any employee or applicant for employment because of sex, age, race, color, creed, national origin, marital status or the presence of any sensory, mental, or physical handicap, unless based upon a bonafide occupational qualificatiqn, and this requirement shall apply to but not be limited to the following: employment, advertising, lay-off or termination, rates of pay or other forms of compensation, and selection for training, including apprenticeship. No person shall be denied or subjected to discrimination in receipt of the benefit of any services or activities made possible by or resulting from this agreement on the ground of sex, race, color, creed, national origin, age, except minimum age and retirement provisions, marital status, or the presence of any sensory, mental or physical handicap. Any violation of this provision shall be considered a violation of a material provision of this agreement and shall be grounds for cancellation, termination or suspension in whole or in part of the agreement by the County and may result in ineligibility for further County agreements. 6. RESERVATIONS: Grantor reserves to itself, licensees, lessees, successors and assigns, the right not only to continue to keep and use or operate all other facilities or structures now upon or beneath the surface of, or above, the said described premises, but also the right to install and use or operate other facilities and structures, provided that said installations may be made without substantial interference with the use of the said premises as provided in this instrument. ..- r- 8. TERMINATION AND ABANDONMENT: If the use of the easement on the ' premises described in—Ws instrument for the purposes expressed herein shall be abandonded or discontinued, or if the Grantee violates any provision of this instrument, the said easement shall thereupon cease and terminate, and • Grantee shall surrender or cause to be surrendered to Grantor, to its successors or assigns, the peaceable possession of the said described premises, and title to the said premises shall remain in Grantor, or its successors or assigns, free and clear of all rights and claims of Grantee. Upon termination of the easement for any reason, Grantee shall remove at his , expense all facilities placed on said property by Grantee and restore the premises to a condition which is equivalent in all respects to the condition existing prior to installation of the facilities or to a condition which is satisfactory to Grantor. If Grantee has not accomplished removal and restoration at the end of a ninety day period following the effective date of revocation, termination or abandonment, Grantor may acomplish all of the necessary work and charge all of the costs to Grantee. 9. RESTORATION AFTER INSTALLATION: Following any construction, Grantee shall return the Granto sr sr property to its original condition by fixing any damage Grantee's construction caused to Grantor's property, including but not limited to property damage to slopes, shrubbery, landscaping, fencing, roadway or structures. 10. EMERGENCY SITUATIONS: In the event of an emergency, Grantee shall take immediate steps to perform any necessary repairs, and in the event Grantee fails so to do, Grantor may perform said necessary repairs at the sole cost and expense of Grantee. 11. OTHER APPLICABLE LAWS: Grantee shall comply with all federal, state 117 and local laws, and assume aT cost and expense and responsibility in vi connection therewith, without any liability whatsoever on the part of Grantor. 04 LI OD Special terms and conditions: 1. The final design of the Sunnydale Mobile Home Park detention facility has been approved for a maximum five (5) year release rate equal to 0.764 cubic feet per second and a twenty-five (25) year storm detention volume equal to 45,916.0 cubic feet. Any increase in discharge rate shall require prior approval by the King County Department of Public Works. 2. The improving and upgrading of the drainage ditch for the purpose of enhancing storm water runoff shall be completed by the City of Renton within four (4) years of the acquisition of the necessary rights in land owned by the Estate of Anna McMahon referred to in special use permit #FS-122-83. _ 'ELOPMENT SERVICES DIVISION WAIVER OF SUBMITTAL REQUIREMENTS FOR LAND USE APPLICATIONS Calculations,Survey, tarsi �.>V1tb ksh�et .............................................................. ................... . ... ......:.........:.:..::::::::::: :::::::::::::.::::.::�.::.._:.::.:::::::.::::::::.............................................. Drainage Control Plan 2 j 2 / Elevations,Architectural 3 AND 4 & . 'Existing Covenants (Recorded Copy)4 Flood Plain Map, if applicable 4 Geotechnical Report2AND3 AJR( () Grading Plan, Detailed 2 ,tleW ite.'4'::::;::;::;::;::;::: ::::::;:;:;::;:::::z::..:: ::>:::;:: ":: '::::::::::::::.;::::iii:i::`: i::;:::.;';:i::i;:::<:i::::;:::;;;;;;:`;•i:::::<:::::;;;:::::;:r;'.'< ;:;: : :::::':::::.::::::;:; Kiri:Cotan ::Assessor::s:::Ma .:1ne#tcatln .5....:.::::::::::::. ::::.:�::::.::::::.:..:.................................... .................................................................................... Landscaping Plan, Conceptual 4 t :fie aI Desc:i :..on.:....:....:....:::::::..:.::::............ ........................... .....................:::.::::..:.:..::::....:::::::................;:;.::.:.:;;:.;.;:.;:;.;:.;:.;:.;::.;:.::.;:.;.;:;:::.;:.:.;::;:::.;::.;::.::::.::.::.;>:.::..:.:::...:....:.... List of Surrounding Property Owners 4 Map of Existing Site Conditions 4 Monument Cards (one per monument), Plan Reductions (PMTs)4 Preapplication Meeting Summary 4 Pubti. ,Sill. u:.::;;.:.:.�..:....::.;;. ...........:::::.::::.:.:::::::: :::. .:�:.::. :::.: .:::...:.:.� :..:.>:.;::.;:::.; ::..:........................................................<.;::.::.:::::::.: ............ Rehabilitation Plan 4 This requirement may be waived by: �aa 1. Property Services Section PROJECT NAME: .U -„ ll R/ . l,,11 )0 wvt,stre-A7n 5(u wi Sys , Ieep1ace,,,w.st 2. Public Works Plan Review Section 3. Building Section DATE: s//VOC) erVi.ect 4. Development Planning Section DEVEGLIOP nF\rr Tv pNN ING VED h:\division.stdevelop.seAdev.pnnsgE\wp REVISED 5/17/00 &� t DEVELOPMENT SERVICES DIVISION WAIVER OF SUBMITTAL REQUIREMENTS FOR LAND USE APPLICATIONS MODIFIED.... ................................ . ;;:.;:.;::;.;::,.::.;:.;.LAND.:...S...::P�.R...M..:.::5:..:...:..:.................................. ............................... ................................................................. . . •:.::::::::.....::::::::.:.:::::: ::>: Screening Detail 4 files .......................................................................................:.....:::.:::::.::...:::.::.. Title Report or Plat Certificate 4 Topography:i.Map>:•5::can.ou..s............................................................................... ................................ ............................................................................................:... Traffic Study 2 /v 2GU TreeCu#tin 1:1fe'..�tatiorlCfear..iri� .Pt..�..�::::::::::::::::::::::::. .:.:.:...:.................................................................................................................................................... Urban Center Design Overlay District Report 4 ... . ..................................................... ..:.... :f�.............� .......:....:::::...:...:.............................................:::::.::::::::.::::::::::::::::::.::::::::::::::::::::::::. Wetlands Delineation Map 4 14 ri ' 2' 2 ` '' < 1l�eftandsPlan#in Pl:Plaan.. ::::::::.:;:::::::::.� :......... :....:.... ... . :.:.::.::;:;:::.:::::.......:::....:.: :...:.. Wetlands Study 4 II/h,N Wireless ......... :»::>::>::>::>::»::>: :::;::>::>::::>::>::>::>: :::>:::::>::>::>::::>::::>::;::<>:>::>::»:::: ::::<:>;: :» :> ir�ven#Q •`<i�f:EXistin .. .I# s. .....::::::::::::::::.:.::::::...:.:::::::........:.:......................................................::::.:::.:::....................................................:............... > >> >A::.reermen..,.:.....:.....: Sitegiglkigwgirtgvkig4i;ifgtg;aiiigWgNINONN >`'> > >#> « > MOMMUI < [ >> »> <[ <'<>': > >< » < > >< < > <> `:<?i`.>< >> f Vi w r This requirement may be waived by: 1. Property Services Section PROJECT NAME: S ic/e 4'v4iffear r 51Wm story, 2. Public Works Plan Review Section fe<vlaam Paieet 3. Building Section DATE: 5// /OO 4. Development Planning Section • • h:\division.s\develop.ser\dev.plan.ing\waiver.xis REVISED 5/17/00 IP O Project Narrative The purpose of the Sunnydale Downstream Storm System Improvement project is to replace 700 feet of 18-inch, corrugated metal storm pipe with a new High-Density Polyethylene (HDPE) pipe of the same diameter. The project is located in the Southeast quarter of Section 16, Township 23 North, Range 5 East W.M., City of Renton,King County Washington. The upper end is at the southeast corner of the Sunnydale Mobile Home Park;the lower end is near the intersection of SE 5th Street and Newport Ave. SE,north of the Maple Valley Highway. The project site is zoned Resource Conservation (RC). The project is bounded by the Sunnydale Mobile Home Park on the northeast corner of the site and the Maplewood Subdivision located near the project outfall to the south. The Mobile Home Park and Subdivision are zoned Residential Manufactured Homes(RMH)and Residential 8 du/ac. (R-8),respectively. Currently,the site consists of 700 feet of storm pipe and associated manhole structures. The site is heavily forested and includes steep slopes (70 % in some places)and a groundwater fed stream which originates from the hillside. Based on the Soil Survey, King County, Washington (USDA Soil Conservation Service 1973), the area soils consist of Alderwood and a small amount of Puyallup soils at the lower end of the project. Alderwood soils are primarily gravelly sandy loam and Puyallup soils are primarily fine sandy loam. `%%, The proposed project is to replace an existing 700-foot-long corrug ted metal storm pipe with a new High Density Polyethylene (HDPE) pipe of the same diamete . The existing pipe is buried for 160 feet at the top of a slope. The remaining portion of the pipe is constructed above ground down. a steep slope. The upper 60 feet of the existing structure is partially crushed, and has resulted in joint separation and subsequent water leakage as well as a reduction in the conveyance capacity of the pipe. One of the two manhole structures on the slope has been undermined and is in danger of collapsing. The buried portion of the existing pipe crosses over two Olympic Pipe Line Company (OPLC) petroleum lines that run north-south along the top of the slope(see site map). The new pipe will be buried in the existing trench at the top of the slope, and will follow an improved above ground alignment to the bottom. The invert elevation of the proposed pipe at the OPLC crossing will be set at minimum of one foot above the petroleum lines. The new pipe will be designed to maximize the vertical clearance between the two facilities. It is anticipated that no clearing will be required, other than brush, for installation. The new pipe will have no intermediate structures, and will have an energy dissipator at the bottom to control scour. The existing pipe and structures will be removed as part of the project. The storm pipe replacement project will reduce erosion at the pipe outlet, and the chance of landslides occurring at the top of the slope as a result of the leaking pipe. The elimination of intermediate manholes will also reduce the chance of landslides and erosion occurring at other locations due to of pipe leaks or the failure of structures. The estimated construction cost of the proposed project$150,000. DEVELOP')nPN%T PLANNING - 'TON H:\DIVISION.S\UTILITIE.S\DOCS\2000-241.doc\AQ\tb L' d iJ 1 E Gag 11111 O Approximately 352 cubic yards of soil would be disturbed during pipe installation. There will be approximately 88 cubic yards of soil removed during construction of the outfall structure. The existing rock buttress will be dismantled and reassembled on-site. Some additional rock backfill for drainage will be placed at the rock buttress. Approximately 16 cubic yards of controlled density fill will be installed within the trench to protect the existing gas pipelines. The City will modify two existing drainage easement to account for the new pipe alignment. The City currently has existing drainage easements with King County and La Pianta,LLC. H:\DIVISION.S\UTILITIE.S\DOCS\2000-241.doc\AQ\tb O Construction Mitigation Description Construction on the proposed-project is scheduled to begin August 21, 2000, and end approximately four weeks later on September 18,2000. The contractor will begin work no earlier than 7:30 AM and will not continue to work past 5:00 PM. The contractor will enter the work site from two locations. The lower end of the project will be accessed via a city maintenance road off of the Maple Valley Highway near SE 5th St. The maintenance road runs approximately 2,000 feet, along the north side of the Maplewood subdivision were it terminates at the existing outfall. The upper end of the project will be accessed via a city maintenance road, which begins at the south end of Union Ave.NE and runs along the southern boundary of the Sunnydale Mobile Home Park. There will be no traffic or transportation impacts as a result of this project. Standard erosion and sediment control BMP's will be used during construction of the outfall to reduce sedimentation of the stream. Prior to beginning work, silt fence will be placed along the stream bank,between the disturbed area and the ordinary high water mark. To further minimize the introduction of sediment into the stream during construction of the energy dissipator, a temporary 18-inch bypass pipe will be installed to divert flows around the construction area. The pipe will be laid along the streambed on the opposite side of construction, beginning at a point approximately 20 feet upstream of the proposed structure. A sandbag headwall will be constructed by hand around the end of the pipe to act as a dam and direct the streamflow into the pipe. Plastic sheeting will be used on the upstream side of the headwall to minimize infiltration through the sandbags. The bypass pipe will discharge approximately 20 feet downstream of the energy dissipator. The bypass pipe and headwall will be removed immediately upon completion of the downstream work. Every effort will be made to minimize disturbance of vegetation in the 25-foot buffer area and in the overall project area. All disturbed areas will be stabilized with hydroseed upon completion of work. To minimize the impacts of equipment noise, construction will take place between the hours of 7:30 AM and 5:00 PM. It is not anticipated the project will produce dust or noxious odors. No special hours for construction and hauling are anticipated. The traffic control plan will be submitted by the contractor after award. The plan will be reviewed and approved by the operations section of the City Transportation Division. Letter of Certificate of Exemption Pursuant to RMC 4-3-050 Section C5-E3 (Utilities), it is requested that a Letter of Certification of Exemption be issued for construction in an area with slopes greater than 40%. H:\DI V ISION.S\UTILITIE.S\DOCS\2000-24I.doc\AQ\tb • O Justification for the Variance Request As part of the Sunnydale Downstream Storm System Replacement Project,the applicant requests a variance from RMC 4-4-130d, 3b for construction of an 18-inch, gravity stormwater discharge pipe within the 25-foot buffer of a stream. As demonstrated below, the request meets the four conditions for a variance. a. That the applicant suffers undue hardship and the variance is necessary because of special circumstances applicable to subject property, including size, shape, topography, and location or surroundings of the subject property; and the strict application of the Building & Zoning Code is found to deprive subject property owner of rights and privileges enjoyed by other owners in the vicinity and under identical classification; The proposed pipe alignment and associated outfall structure was chosen to minimize environmental impacts to the stream and surrounding area. Choosing to construct the pipe on the south side of the stream vs. over the current alignment(north side of stream) will avoid the need to construct a crossing and manhole structure adjacent to the stream, which would be susceptible to erosion and subsequent failure. The proposed alignment also eliminates the requirement for intermediate manhole structures at the top of the hill reducing additional soil disturbance. Because of the nature of the existing topography on the north side of the stream, it would be very difficult to construct an energy dissipator at the location of the existing outfall. The topography on the south side of the stream is relatively flat providing an ideal location for an energy dissipating structure. b. That the granting of the variance will not be materially detrimental to the public welfare or injurious to the property or improvements in the vicinity and zone in which subject property is situated;and, Replacing the existing system in a more stable location will reduce/eliminate system • failer while better protecting public welfare and property. c. That approval shall not constitute a grant of special privilege inconsistent with the limitation upon uses of other properties in the vicinity and zone in which the subject property is situated;and Storm systems must eventually discharge to natural waterbodies,which can only be done by allowing work/construction within the 25-foot buffer. d. That the approval, as determined by the Hearing Examiner or Board of adjustment, is a minimum variance that will accomplish the desired purpose. This is the only variance required for working within the 25-foot buffer of a stream. As stated above, storm systems discharge to a natural waterbody or drainage course, which requires construction work within the 25-foot buffer.There is no other alternative. H:\DIVISION.S\UTILITIE.S\DOCS\2000-241.doc\AQ\tb DEVELOPMENT SERVICESDWIS� EN'v 1RONMENTAL CHECKLIST PURPOSE OF CHECKLIST: The State Environmental Policy Act(SEPA),Chapter 43.21C RCW,requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An Environmental Impact Statement(EIS)must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide information to help you and the agency identify impacts from your proposal(and to reduce or avoid impacts from the proposal,if it can be done)and to help the agency decide whether an EIS is required. INSTRUCTIONS FOR APPLICANTS: This environmental checklist asks you to describe some basic information about your proposal. Governmental agencies use this checklist to determine whether the environmental impacts of your proposal are significant,requiring preparation of an EIS. Answer the questions briefly,with the most precise information known,or give the best description you can. You must answer each question accurately and carefully,to the best of your knowledge. In most cases,you should be able to answer the questions from your own observations or project plans without the need to hire experts. If you really do not know the answer,or if a question does not apply to your proposal,write"do not know"or"does not apply". Complete answers to the questions now may avoid unnecessary delays later. Some questions ask about governmental regulations,such as zoning,shoreline,and landmark designations. Answer these questions if you can. If you have problems,the governmental agencies can assist you. The checklist questions apply to all parts of your proposal,even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to determining if there may be significant adverse impact. USE OF CHECKLIST FOR NONPROJECT PROPOSALS: Complete this checklist for nonproject proposals,even though questions may be answered"does not apply." IN ADDITION, complete the SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS(part D). For nonproject actions(actions involving decisions on policies,plans and programs),the references in the checklist to the words"project," "applicant,"and"property or site"should be read as"proposal," "proposer,"and"affected geographic area," respectively. A. BACKGROUND 1. Name of proposed project, if applicable: Sunnydale Downstream Storm System Replacement Project 2. Name of Applicant: City of Renton Surface Water Utility 3. Address and phone number of applicant and contact person: Allen Quynn 1055 South Grady Way DEVELOPMENT PLANNING CITY OF RENTON Renton,Washington 98055 425-430-7247 J U N 0 1 Za'1 a-CEIv 4. Date checklist prepared: 5/10/00 5. Agency requesting checklist: City of Renton 6. Proposed timing or schedule(including phasing, if applicable): The project will be constructed during the summer of 2000. Environmental Checklist • 7. Do you have any plans for future additions,expansion,or further activity related to or connected to this project? Yes ® No. If yes, explain. 8. List any environmental information you know about that has been prepared,or will be prepared, directly related to this proposal. Geotechincal Report,Zipper Zeman Associates,May 2000. See Appendix A 9. Do you know whether applications,are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? Yes ® No. If yes, explain. 10. List any governmental approvals or permits that will be needed for your proposal, if known. Washington State Dept.of Fish and Wildlife Hydraulic Project Approval Permit. 11. Give brief,complete description of your proposal, including the proposed uses and the size of the project and site. The proposed project is to replace an existing 700-foot-long corrugated metal stormwater with a new High-Density Polyethylene(HDPE)pipe of the same diameter. The project is needed to replace the existing storm system which is failing. The existing pipe is buried for a length of 160-feet along a flat section at the top of a slope. The remaining portion of the pipe is constructed above ground,down a steep slope. The upper 60-feet of the existing pipe has been partially crushed,resulting in joint separation and subsequent water leakage as well as reduction in the conveyance capacity of the pipe. One of the two manhole structures on the slope has been undermined and is in danger of collapsing. The buried portion of the existing pipe crosses over two Olympic Pipeline Co. (OPLC) petroleum lines that run north-south along the top of the slope(see site map). The new pipe will be buried in the existing trench at the top of the slope,and will follow an improved above-ground alignment to the bottom. The invert elevation of the proposed pipe at the OPLC crossing will be set at a minimum of one-foot above the petroleum lines. The new pipe will be designed to maximize the vertical clearance between the two facilities. It is anticipated that no clearing will be required,other than brush,for installation. The new pipe will have no intermediate structures,and will have an energy dissipator at the bottom to control scour. The existing pipe and structures will be removed as part of the project. The project will reduce erosion at the pipe outlet. It will reduce the chances of landslides occurring at the top of the slope from the leaking pipe,and will reduce the chances of landsliding or erosion occurring at other locations because of pipe leaks or the failure of structures. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any,and section,township, and range if know. If a proposal would occur over a range of area,provide the range or boundaries of the site(s). Provide a legal description, site plan,vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency,you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The project is located in SE 1/a Section 16,Township 23N,Range 5E. The upper end is at the southeast corner of the Sunnydale Mobile Home Park. The lower end is near the intersection of SE 5th Street and Newport Avenue SE,north of the Maple Valley Highway. See Appendix B. A maintenance access road to the outlet is entered off of Maple Valley Road near the west end of SE 5th Street. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 2 Environmental Checklist •' B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site: ❑ flat ❑ rolling ® hilly ® steep slopes ❑ mountainous ❑ other For detailed information the soils condition on site,see the attached Field Exploration and Geotechnical Study(Zipper-Zeman 2000). b. What is the steepest slope on the site(approximate percent slope?) The steepest slope on the site is 70 percent. c. What general types of soils are found on the site(for example, clay,sand,gravel,peat,muck)? If you know the classification of agricultural soils,specify them and note any prime farmland. According to the Soil Survey King County,Washington(USDA Soil Conservation Service 1973),the area soils consist of Alderwood and a small amount of Puyallup soils at the lower end of the project. Alderwood soils consist primarily of gravelly sandy loam and Puyallup soils consist primarily of fine sandy loam. Also refer to the Field Exploration and Geotechnical Study(Zipper-Zeman 2000). d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. From Station 3+42 to 3+86,there is evidence of the remnant of a shallow landslide/erosional scar. From approximately Station 4+50 to 5+50,there is the presence of several trees with curving and leaning trunks,suggesting that the vegetation is subject to slow downslope creep of near surface soils. For more detailed information refer to the Field Exploration and Geotechnical Study(Zipper-Zeman 2000). e. Describe the purpose,type,and approximate quantities of any filling or grading proposed. Indicate source of fill. Approximately 352 cubic yards of soil would be disturbed during pipe installation. There would be approximately 88 cubic yards of soil removed during construction of the outfall structure. The existing rock buttress will be dismantled and reassembled on-site. Some additional rock backfill for drainage will be placed at the rock buttress. Approximately 16 cubic yards of controlled density fill will be installed within the trench to protect the existing gas pipelines. f. Could erosion occur as a result of clearing, construction, or use? If so,generally describe. Erosion could occur when the soils are exposed during construction..It is anticipated that construction will be completed within three to four weeks. g. About what percent of the site will be covered with impervious surfaces after project construction (for example,asphalt or buildings)? There would be no new impervious surface area. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 3 Environmental Checklist • h. Proposed measures to reduce or control erosion,or other impacts to the earth, if any: Only minor clearing of brush will occur along the aboveground alignment,with some hand digging in one location. The project would follow best management practices(BMPs)to control erosion. Construction is expected to be completed within a three to four-week time frame. The exposed soils at the catch basin outlet would be seeded. 2. AIR a. What types of emissions to the air would result from the proposal(i.e.,dust,automobile, odors,and industrial wood smoke)during construction and when the project is completed? If any, generally describe and give approximate quantities if known. During construction,emissions from construction equipment would be generated. b. Are there any off-site sources of emission or odor that may affect your proposal? Yes®No. If so, generally describe. None. c. Proposed measures to reduce or control emissions or other impacts to air, if any: None. 3. WATER a. Surface Water: 1) Is there any surface water body on or in the immediate vicinity of the site(including year-round and seasonal streams, saltwater, lakes,ponds,wetlands)?® Yes No. If yes,describe type and provide names. If appropriate, state what stream or river it flows into. A year-round groundwater fed stream follows the lower portion of the existing alignment to the outlet and is tributary to the Cedar River. 2) Will the project require any work over, in,or adjacent to(within 200 feet)the described waters? ® Yes El No. If yes,please describe and attach available plans. The existing pipe,manholes,and pipe supports would be removed by hand as part of the project. Approximately 800-feet of storm pipe will be constructed within 200-feet of the stream. The majority of the pipe or approximately 700-feet will be constructed above ground. The lower end of the new alignment will include an energy dissipator and approximately 100-feet of buried storm pipe adjacent to the stream. To minimize the introduction of sediment into the stream during the construction of the outfall structure,a temporary 18-inch bypass pipe will be installed to divert flows around the construction area. The pipe will be laid along the streambed on the opposite side of construction,beginning at a point approximately 20 feet upstream of the proposed structure. A sandbag headwall will be constructed by hand around the end of the pipe to act as a dam and direct the stream flow into the pipe. Plastic sheeting will be used on the upstream side of the headwall to minimize infiltration through the sandbags. The bypass pipe will discharge approximately 20 feet downstream of the energy dissipator. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 4 Environmental Checklist • 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. None. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose,and approximate quantities if known. No. 5) Does the proposal lie within a 100-year flood plain? Yes ® No. If so,note location on the site plan. 6) Does the proposal involve any discharges of waste materials to surface waters? Yes ® No. If so,describe the type of waste and anticipated volume of discharge. b. Ground Water: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description,purpose, and approximate quantities if known. No. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any(for example: Domestic sewage; industrial,containing the following chemicals..; agricultural; etc.). Describe the general size of the system,the number of such systems,the number of houses to be served(if applicable), or the number of animals or humans the system(s)are expected to serve. None. c. Water Runoff(including storm water): 1) Describe the source of runoff(including storm water)and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters, If so,describe. The proposed project will convey stormwater runoff from the Sunnydale Mobile Home Park down a steep slope to an energy dissipator at the base of the slope.The energy dissipator will then discharge the storm runoff into a natural groundwater fed stream which continues west for approximately 1,300 feet and enters two small detention ponds in series. Where the stream enters the first pond,a second outfall discharges additional runoff from a storm system serving the Maplewood Subdivision. Once the stream exits the last detention pond,it enters a 24-inch storm pipe which conveys the stream across the Maple Valley Highway for approximately 350-feet before discharging into the Cedar River. 2) Could waste material enter ground or surface waters? If so,generally describe. No. d. Proposed measures to reduce or control surface,ground,and runoff water impacts, if any: The purpose of the project is to reduce runoff water impacts. It will replace an existing pipe,which is in poor condition and leaking,with a more reliable pipe. It will also replace an eroding outfall with an energy dissipator to reduce erosion and scour. During construction,a flow bypass system will be installed which conveys any stormwater safely down the existing pipe,until the new pipe is installed. Erosion control BMPs will also be used during construction. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 5 Environmental Checklist • 4. PLANTS a. Check types of vegetation found on the site: ®deciduous tree:alder,maple,aspen,other ®evergreen tree:fir,cedar,pine,other ®shrubs ❑grass ❑pasture ❑crop or grain ❑wet soil plants:cattail,buttercup,bullrush,skunk cabbage,other ❑ water plants:water lily,eel grass,milfoil,other ®other types of vegetation b. What kind and amount of vegetation will be removed or altered? Some brush and blackberries would be cleared at the top of the project where the pipe is • buried. For the portion of the alignment where the pipe is above ground,only a minimal amount of vegetation will be cleared by hand. No trees would need to be removed. Some grasses would be disturbed for construction of the energy dissipator. c. List threatened or endangered species known to be on or near the site. Do not know. d. Proposed landscaping,use of native plants,or other measures to preserve or enhance vegetation on the site, if any: Natural grass seed would be used to replant on any disturbed soils. 5. ANIMALS a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: (see next page) Birds: hawk,heron,eagle,songbirds,other Mammals: deer,bear,elk,beaver,other raccoons Fish: bass, salmon,trout,herring, shellfish,other Frogs,(see 5b.,below) b. List any threatened or endangered species known to be on or near the site. Down gradient of the site approximately'/z mile is the Cedar River. The Cedar River is used by migrating adult and juvenile chinook salmon(Oncorhynchus tshawystscha),coho salmon(Oncorhynchus kisutch),and native char,including bull trout(Salvelinus confluentus). Only Chinook Salmon and Bull Trout are presently listed as threatened. c. Is the site part of a migration route? If so,explain The project is within the Pacific Flyway. d. Proposed measures to preserve or enhance wildlife, if any: None. 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy(electric,natural gas,oil,wood stove, solar)will be used to meet the completed project's energy needs? Describe whether it will be used for heating,manufacturing, etc. None. • w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp • Page 6 Environmental Checklist • b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: None. 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill,or hazardous waste,that could occur as a result of this proposal? If so, describe. Fuel or oil spills could occur from construction equipment. 1) Describe special emergency services that might be required. None. 2) Proposed measures to reduce or control environmental health hazards, if any: Refueling of equipment would not occur in sensitive areas. Equipment would be checked for oil leaks and repaired before returning to site. b. Noise 1) What types of noise exist in the area which may affect your project(for example: traffic, equipment,operation, other)? None. 2) What types and levels of noise would be created by or associated with the project on a short-term or a long-term basis(for example: traffic,construction,operation, other)? Indicate what hours noise would come from the site. Short-term noise would be generated from construction equipment and could go as high as 90 dBA. No long-term noise would be generated from the project. 3) Proposed measures to reduce or control noise impacts, if any: None are proposed. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? The site is currently a greenbelt and consists of forested steep slopes. Residential land uses are located atop the steep slopes,as well as at the bottom. b. Has the site been used for agriculture? Yes ® No. However,the site may have been used historically to harvest timber. c. Describe any structures on the site. None. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 7 Environmental Checklist • d. Will any structures be demolished? ® Yes Ej No.If so,what? An existing corrugated metal pipe,two catchbasins,and some pipe support structure, including an I-beam,will be removed an disposed of. e. What is the current zoning classification of the site? RC—Resource Conservation f. What is the current comprehensive plan designation of the site? Residential Rural g. If applicable,what is the current shoreline master program designation of the site? Does not apply. . h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. The existing and proposed pipe is on slopes greater than 40 percent. i. Approximately how many people would reside or work in the completed project? Does not apply. j. Approximately how many people would the completed project displace? Does not apply. k. Proposed measures to avoid or reduce displacement impacts, if any: Does not apply. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: The steep slopes preclude any future development. 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high,middle, or low- income housing. Does not apply. b. Approximately how many units, if any,would be eliminated? Indicate whether high,middle, or low-income housing. Does not apply. c. Proposed measures to reduce or control housing impacts, if any: Does not apply. 10. AESTHETICS a. What is the tallest height of any proposed structure(s),not including antennas;what is the principal exterior building material(s)proposed. Energy dissipator structure will extend approximately 20 inches above ground. b. What views in the immediate vicinity would be altered or obstructed? None c. Proposed measures to reduce or control aesthetic impacts,if any: Does not apply. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 8 Environmental Checklist __ 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce?None What time of day would it mainly occur?Does not apply. b. Could light or glare from the finished project be a safety hazard or interfere with views?No c. What existing off-site sources of light or glare may affect your proposal?None d. Proposed measures to reduce or control light and glare impacts, if any: Does not apply. 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? None known b. Would the proposed project displace any existing recreational uses? Yes ►i No. If so, describe. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: Does not apply. 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on,or proposed for,national state, or local preservation registers known to be on or next to the site? If so, generally describe. None known. b. Generally describe any landmarks or evidence of historic,archaeological, scientific,or cultural importance known to be on or next to the site. Does not apply. c. Proposed measures to reduce or control impacts, if any: Does not apply. 14. Transportation a. Identify public streets and highways serving the site,and describe proposed access to the existing street system. Show on site plans, if any. During construction,the top would be accessed from an existing maintenance road southwest of the Sunnydale Mobile Home Park,off of Union Avenue NE. The bottom of the project would be accessed through an existing maintenance road on the north side of the Maple Valley Highway,west of SE 5th Street. b. Is site currently served by public transit? If not,what is the approximate distance to the nearest transit stop? Does not apply. c. How many parking spaces would the completed project have? How many would the project eliminate? None d. Will the proposal require any new roads or streets,or improvements to existing roads or streets,not including driveways? If so,generally describe(indicate whether public or private? No w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 9 Environmental Checklist • e. Will the project use(or occur in the immediate vicinity of)water,rail, or air transportation? If so, generally describe. No f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. Does not apply. g. Proposed measures to reduce or control transportation impacts, if any: Does not apply. 15. Public Services a. Would the project result in an increased need for public services(for example: fire protection, police protection,health care, schools, other)? If so,generally describe. No b. Proposed measures to reduce or control direct impacts on public services, if any. Does not apply. 16. Utilities a. Circle utilities currently available at the site: electricity,natural gas,water,refuse service, telephone,sanitary sewer, septic system, other. Olympic Pipeline Co.has two petroleum lines that cross the existing storm line at the top of the slope. b. Describe the utilities that are proposed for the project,the utility providing the service,and the general construction activities on the site or in the immediate vicinity which might be needed. None. w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 10 Environmental Checklist • C. SIGNATURE I,the undersigned,state that to the best of my knowledge the above information is true and complete. It is understood that the lead agency may withdraw any declaration of non-significance that it might issue in reliance upon this checklist should there be any willful misrepresentation or willful lack of full disclosure on my part. Proponent: Ofv. Name Printed: 4 I+wl l/(v Date: 6/1/00 J w:projects/00050/SEPA/sunnychecklist(05/18/00)Imp Page 11 • APPENDIX A Geotechnical Report Zipper Zeman Associates, Inc. Geotechnical and Environmental Consulting J-686 10 May 2000 Entranco • ;;�,4 6; 10900 N.E. 8th Street, Suite 300 " 4.41 Bellevue, Washington 98004 ENTRANCO Attention: Mr. Bruce Jensen MAY 1 1 2000 Subject: Field Exploration and Geotechnical Engineering Study RECEIVED Proposed Sunnydale Downstream SIP Renton, Washington Entranco Project No. 1-10-00050-20 Dear Mr. Jensen: • Zipper Zeman Associates, Inc. (ZZA) is pleased to present herein a copy of the above- referenced report. This report presents the results of our surface mapping, subsurface exploration, and geotechnical engineering study relative to pipeline siting and construction aspects of the proposed project. Our services have been provided in accordance with the terms of our Subconsultant Agreement dated 13 March 2000. The purpose of the study was to establish general surface and subsurface conditions at the site from which conclusions and recommendations regarding storm water pipeline and structure design and construction considerations could be formulated. The scope of our services consisted of field explorations, laboratory testing, geotechnical engineering analysis, and preparation of this report. Our scope of services did not include sampling or testing of soil or water for regulated environmental contaminants. Should the nature of the proposed site improvements change from those described herein, we recommend that our firm be provided the opportunity to review the plans in order to verify that the conclusions and recommendations presented in this report are appropriate for the design. This report is an instrument of service and has been prepared in accordance with generally accepted geotechnical engineering practices for the exclusive use of Entranco, the City of Renton, and their agents, for specific application to this project and site location. SITE AND PROJECT DESCRIPTION The project site spans the area extending from the Sunnydale residential development located on the north hillside overlooking the Cedar River valley, toward the residential neighborhood located along S.E. 5th Street near the toe of the hillside. The site encompasses an existing drainage easement and adjacent areas, as shown on the Vicinity Map, Figure 1. The proposed project entails replacing existing storm water drainage system components between the detention pond located at the top of the hillside and the end of an above ground tightline terminating in a creek at the bottom of the hillside. Currently proposed project elements include: ' 19321 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 • Proposed Sunnydale Downstream SIP Fis J-686 • Renton, Washington fil 10 May 2000 Page 2 • Replacement of approximately 160 feet of 18-inch buried corrugated metal pipe (CMP) with a buried HDPE pipe; • Replacing an existing above ground 18-inch CMP with an 18-inch inside-diameter HDPE pipe installed at along a different alignment. The proposed tightline alignment is approximately 700 feet long; • Installing a stilling well energy dissipator adjacent to the creek a short distance downstream of the existing CMP terminus. SITE CONDITIONS The site conditions for the preliminary study were evaluated in March and April 2000. The surface and subsurface conditions are described below, while the exploration procedures and interpretive logs of the explorations are presented in Appendix A. Laboratory testing procedures and results are presented in Appendix B. The proposed site development and approximate exploration locations are shown on the Site and Exploration Plan, Figure 2. Surface Conditions The project site can be characterized as containing a developed upland including and adjacent to the Sunnydale development, and an undeveloped ravine and lowland. For descriptive purposes we have broken the site into these two areas, as presented below. Developed Upland The upper portion of the site comprised a relatively level area located south of, and behind, the residences along Madrona Drive, the southernmost street in the Sunnydale neighborhood. A gravel surface road extended south from Madrona Drive, accessing a storm water detention pond located east of the road. A control manhole was located west of the pond and road, adjacent to a moderately steep slope that extended downward in a westerly direction to a utility easement. The upland area adjacent to the pond was at approximately elevation 310 to 312 feet. Lawn bordered the pond and access road, while a thick growth of blackberry bushes mantled the slope to the west. The detention.pond contained water at the time of our site visits, and some standing water was present on the access road. The overgrown slope extending below the pond access road dropped approximately 12 to 15 feet at an inclination of approximately 30 to 35 percent. A portion of the slope approximately 25 to 50 feet southwest of the upper manhole, was oversteepened and mantled with large rock. As will be discussed subsequently, the rock was placed as part of efforts to repair an erosional scar on the steep slope. Zipper Zeman Associates,Inc. 19231 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 ID , ' Proposed Sunnydale Downstream SIP ;:;.' k 77 Renton, Washington 10 May 2000 Page 3 A cleared easement containing overhead electrical transmission lines and two underground petroleum pipelines bordered the slope below the pond and access road. The cleared portion of the easement was about 40 feet wide, and sloped downward to the west approximately 6 feet over its width west of the pond. A catch basin was located on the west side of the easement. The catch basin lid was at an elevation of approximately 284 feet, according to survey information provided to us by Entranco. A buried 18-inch diameter CMP extended between the upper manhole and the lower catch basin. The burial depth ranged from about 12 feet at the upper manhole to about 3 feet at the western catch basin. For descriptive purposes, we considered the catch basin the western extent of the developed upland portion of the site. Undeveloped Ravine A large ravine extended in a southwesterly direction from the petroleum pipeline easement. The ravine terminated on the north side of the Cedar River valley, approximately 600 feet west of the easement. Ground surface elevations from the western catch basin and the end of the ravine ranged from approximately 284 to 90 feet. The south side of the ravine had inclinations ranging from about 23 to 67 percent, with the slope inclination generally increasing in proximity to the slope toe. The inclination of the north side of the ravine was slightly steeper overall. The ravine sideslopes were well vegetated with brush and both deciduous and evergreen trees. A shallow stream flowed in the ravine bottom. Erosion of the ravine was evidenced by the incised nature of the channel with steep sideslopes. An 18-inch CMP extended from the west side of the catch basin on the west side of the petroleum pipeline easement above the ravine. The CMP extended essentially down the fall line of the ravine sideslope for a distance of about 215 feet. The CMP entered a manhole at the toe of the steep slope. The remainder of the CMP was located on a narrow shelf excavated near the toe of the ravine's north sideslope, a few feet above the stream below. The lowermost portion of the CMP extending toward the manhole in the creek was supported by timber and steel cribbing. The manhole was undermined, and supported in part by a piece of wood blocking jammed between the manhole bottom and the streambed below. The CMP was locally deformed from having been impacted by falling trees. The CMP terminated approximately 360 feet downstream of the manhole. Water from the CMP discharged approximately 4.3 feet above the streambed. Surface Conditions—Proposed Tightline Alignment The project includes abandoning the existing above ground CMP and replacing it with an above ground HDPE tightline following a different alignment. The proposed alignment extends across and down the south side of the ravine, approximately as shown on Figure 2. Surface conditions along the proposed tightline alignment are described below. For discussion purposes, we designated the existing catch basin at the west side of the petroleum pipeline easement as Station 0, and walked the alignment to the west, finishing at approximately Station 7+12, the downstream end of the HDPE tightline and proposed stilling well energy dissipator location. Zipper Zeman Associates,Inc. 19231 36`1'Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 • -- Proposed Sunnydale Downstream SIP ' . '' 44 J-686 Renton, Washington 10 May 2000 Page 4 Station 0+00 to Station 0+70 The alignment along this interval extended from the west side of the existing catch basin down a steep slope with an inclination of approximately 35 degrees from horizontal. The slope was mantled with both brush and trees, and lacked surficial evidence of landslide activity or significant erosion. Station 0+70 to Station 1+30 The slope inclination along this interval was approximately 30 degrees from horizontal, and like the steeper section above, lacked evidence of slope instability or surface water erosion. Station 1+30 to Station 3+10 This portion of the alignment followed a relatively gently sloping path cutting across the upper reaches of the south ravine sideslope. The cross slope inclination was as steep as approximately 25 percent. The hillside was mantled with a well-developed growth of deciduous and evergreen trees, as well as brush. Station 3+10 to Station 3+42 The cross slope inclination along this interval of the alignment increased to approximately 35 percent, based upon hand held clinometer measurements. Station 3+42 to Station 3+86 The alignment crossed the remnant of a shallow landslide/erosion scar along this section. The middle of the feature was 2 to 3 feet deeper than the adjacent grades on either side, and was well vegetated. Station 3+86 to Station 4+10 This portion of the alignment comprised an undisturbed, open section of slope lacking evidence of past earth movement or significant erosion. Station 4+10 to Station 4+50 This 40-foot long interval of the alignment spans a slight depression most likely produced by soil and root displacement resultant from a large tree having fallen over. The center of the feature was 3 to 4 feet below the adjacent grade at either side. Zipper Zeman Associates,Inc. 19231 36''Avenue West,Suite B20I Lynnwood,Washington 98036 (425)771-3304 • Proposed Sunnydale Downstream SIP r ' FrZ J-686 Renton, Washington sty+� 10 May 2000 Page 5 Station 4+50 to Station 5+50 The 100-foot long section extended downslope toward the toe of the south side of the ravine, extending through a brush-covered area. The presence of several trees with curving and leaning trunks suggest that the vegetation is subject to solifluction, or slow downslope creep of near surface soils, as well as phototropism. Station 4+50 to Station 7+12 This interval of the alignment followed the south side'of the stream channel flowing out of the steep sided ravine. The south side of the stream contained a sparse vegetation growth and abundant riprap immediately adjacent to the stream. The stream channel was about 3 to 4 feet along this interval. The channel bank at the proposed energy dissipator location was characterized by brush, bare ground, and some saplings. Subsurface Conditions Subsurface conditions were explored by advancing borings adjacent to the existing buried CMP near the detention pond and along the east side of the petroleum pipeline easement (B-1, B-2), by excavating two test pits (TP-1, TP-2) at the downstream end of the proposed tightline alignment where the energy dissipator will be installed, and by advancing four hand explorations (HA-1 through HA-4) on the south side of the ravine along the proposed tightline alignment. Soil descriptions presented in this report are based on the subsurface conditions encountered at specific exploration locations across the site. Variations in subsurface conditions may exist between the exploration locations and the nature and extent of variations between the explorations may not become evident until construction. If variations then appear, it may be necessary to reevaluate the recommendations of this report. The publication Preliminary Geologic Map of Seattle and Vicinity, Washington (U.S.G.S. Map I-354, 1962) describes the upland portion of the site as underlain by recessional outwash sand and gravel above Vashon glacial till. The recessional outwash is a normally consolidated granular soil deposit, generally characterized by a moderate to high permeability and susceptibility to erosion by flowing water. The glacial till is a glacially consolidated, heterogeneous soil with a wide ranging grain size distribution. The till is underlain by "older clay", a combination of clay, sand, and gravel, and advance outwash deposits. The advance outwash can contain sand, silt, clay, and some gravel horizons. The material is glacially consolidated. The referenced map describes the soils at the bottom of the ravine and in close proximity to the steep slopes on the north side of the Cedar River valley as older landslide deposits. Subsurface conditions as disclosed by the explorations completed for this study confirmed the presence of the soils described in the publication, and also disclosed fill material, as described below. Zipper Zeman Associates,Inc. 19231 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 Proposed Sunnydale Downstream SIP «' la,ra14 J-686 Renton, Washington 10 May 2000 Page 6 Developed Upland Area Boring B-2, advanced along the existing buried CMP southwest of the upper manhole, disclosed approximately 16.5 feet of loose to medium dense, moist, brown, gravelly, silty sand and sandy gravel fill material. The fill was underlain by very stiff, moist, blue-gray silt to the boring's termination depth of 21.5 feet below grade. Boring B-2, advanced along the buried CMP at the east side of the petroleum pipeline easement, disclosed soft to stiff silt and gravelly silt with some interbedded fine sand soils to the boring's termination depth of 11.5 feet below grade. Groundwater was not encountered at either of the two boring locations at the time of drilling. Undeveloped Ravine Hand explorations HB-1 through HB-4 were advanced along the proposed tightline alignment as shown on Figure 2. Each of the explorations disclosed a surficial organic forest duff horizon underlain by loose gravelly sand or soft silt with some fine sand. These soils were underlain by loose to dense sand and stiff to very stiff sandy silt. These lower soils are representative of the advance outwash materials. Slight groundwater seepage was observed at a depth of 2.7 feet while advancing boring HB-1. Test pits TP-1 and TP-2 were excavated at the mouth of the ravine at prospective energy dissipator locations. Test pit TP-1, located near the existing CMP outfall, disclosed approximately 6 feet of medium dense gravelly sand fill. The fill had a variable silt content, and contained some angular gravel and cobbles, as well as organic material. A relic topsoil horizon was encountered at a depth of about 6 to 6.5 feet. The old topsoil was underlain by approximately 1.5 feet of stiff to very stiff sandy silt with some gravel and interbedded sand. The test pit was terminated at a depth of 11 feet in a medium dense silty sand with some gravel and interbedded sandy silt. Slow groundwater seepage was observed at a depth of 9.5 feet at the time of excavation. Test pit TP-2 was excavated approximately 100 feet downstream of the existing CMP outfall. Approximately 3 feet of loose to medium dense gravelly sand with some silt (fill material) was observed at this location, above relic topsoil that extended to a depth of approximately 3.5 feet. The relic topsoil was underlain by soft to medium stiff sandy silt with some organics and trace gravel to a depth of approximately 6 feet below grade. This material is likely colluvium, or soil that has migrated downslope resultant from natural mass wasting processes, in our opinion. The colluvium was underlain by stiff to very stiff sandy silt and medium dense gravelly sand to the test pit's 10-foot termination depth. Rapid groundwater seepage at a depth of 8 feet below grade was observed. Conditions observed at the exploration locations are summarized in the table below. Zipper Zeman Associates, Inc. 19231 3611i Avenue West,Suite B201 Lynnwood,Washington 98036 • (425)771 -3304 Proposed Sunnydale Downstream SIP D .,Pnc .4s. FTJ-686 Renton, Washington 10 May 2000 1 Page 7 Exploration Summary Exploration Ground Surface Fill Thickness(feet) Depth to Med. Groundwater Elevation(feet)* Dense/Medium Depth(feet)** Stiff Soils(feet) B-1 289 NE 0 NE B-2 312 16.5 0 NE TP-1 103 6 6.5 9.5 TP-2 90 3 5 8 HB-1 220 NE 2.5 2.7 HB-2 196 NE 2 NE HB-3 178 NE 2 NE HB-4 172 NE 1.5 NE * Ground surface elevations referenced topography shown on plan provided by Entranco; ** Groundwater conditions may vary due to weather, irrigation,and other factors; NE: Not Encountered • S.C.S. Soil Descriptions Review of the Soil Survey of King County Area, Washington (U.S.D.A., Soil Conservation Service,November 1973) identified the site as mantled by three major soil types: • Alderwood gravelly sandy loam (6 to 15 percent slopes) near the detention pond. These soils are formed in glacial tills, and are characterized by a relatively low permeability and moderate erosion potential; • Alderwood and Kitsap soils (very steep) below the easement through the ravine. The Alderwood and Kitsap soils are derived from glacially consolidated materials, and are present on steep slopes. The soils may exhibit a severe to very severe erosion potential and a severe slippage potential; • Puyallup fine sandy loam has been mapped in the valley bottom. The Puyallup soils are described as loamy sands with a slight erosion potential. Groundwater Groundwater seepage was observed at the locations of test pits TP-1 and TP-2 at depths of approximately 9.5 and 8 feet, respectively. Slight seepage was observed at the hand boring HB-1 location at a depth of 2.7 feet. Groundwater was not encountered while drilling borings B-1 and B-2. A perched groundwater condition can sometimes develop within glacially consolidated soils, due to their relatively high fines content and density producing a low permeability, or within interbedded granular and fine grained soils. It should be noted that groundwater- conditions may fluctuate due to seasonal precipitation variation, site utilization, irrigation, and other factors. Zipper Zeman Associates,Inc. 19231 36h Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 Proposed Sunnydale Downstream SIP s J-686 G3� r '.I Renton, Washington 10 May 2000 Page 8 Seismic Criteria Figure 16-2 presented in the 1997 Uniform Building Code classifies the subject site as being within Seismic Zone 3. Based on the subsurface conditions encountered at the site and published geologic literature, it is our opinion that a Soil Profile Type of Se should be used to describe the average properties within the upper 100 feet of soil beneath the site. This designation describes soils that are considered very dense with a shear wave velocity of 1,200 to 2,500 feet per second, Standard Penetration Test values greater than 50, and an undrained shear strength of greater than 2,000 psf. The publication Liquefaction Susceptibility for the Des Moines and Renton 7.5-minute Quadrangles, Washington (Washington Division of Geology and Earth Resources, GM-41, 1994) describes the developed upland and undeveloped ravine portions of the site as having a Category III liquefaction susceptibility risk. A Category III characterization reflects a low liquefaction susceptibility, generally reflecting glacially consolidated soils. The valley margin immediately adjacent to the site (areas containing mass wasting and colluvial deposits) are described as a Category II liquefaction risk. The nomenclature considers a Category II risk low to high. CONCLUSIONS AND RECOMMENDATIONS Site improvement plans consider replacing approximately 160 feet of buried storm sewer with a new buried 18-inch diameter HDPE pipe near the Sunnydale development, installing approximately 700 feet of new 18-inch diameter HDPE pipe (about 550 feet on the surface and about 150 feet buried), and constructing a stilling well energy dissipator. Based upon the site conditions observed during our exploration, the project appears feasible from the geotechnical perspective. Selected considerations include: • Subsurface conditions observed along the buried portion of the pipe near the detention pond comprise native silt and silty sand soils, as well as sandy gravel and gravelly sand fill. Groundwater was not disclosed at the exploration locations along the buried pipe alignment; • Re-use of the existing granular fill as trench backfill for the upper buried pipe section is feasible. Re-use of the native fine grained soils will depend upon the material's moisture content at the time of compaction. Budget provisions for importation of granular backfill and removal of the fine grained soils is recommended; • Placement of the HDPE pipe on the ground surface between the petroleum pipeline easement and the bottom of the slope about 150 feet above the stilling basin is feasible. Limited hand excavation and shallow pipe burial is recommended at three locations along the surface alignment so that the pipe can be placed on the surface along two shallow depressions; • Conventional pre-cast manhole structure installation for the proposed stilling well energy dissipator is feasible. Dewatering at the time of excavation and structure placement should Zipper Zeman Associates,Inc. 19231 36ih Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 • Proposed Sunnydale Downstream SIP 'r J-686 i r'` H � Renton, Washington 10 May 2000 Page 9 be anticipated is the structure is founded at or below the depth where groundwater seepage was observed at the test pit TP-2 location; • Re-use of non-organic soils excavated along the lower section of buried HDPE, and at the energy dissipator location, is considered feasible. Presented below are our conclusions and recommendations regarding environmentally sensitive areas, trench excavation and backfilling, structure foundation subgrade preparation, and tightline anchorage. Environmentally Sensitive Area Considerations Erosion Hazard The sloping upland portion of the site, downslope of the detention pond access road and the toe of slope about 150 feet above the energy dissipator location, represents a potential erosion hazard, in our opinion, and should be considered sensitive to uncontrolled surface water flow during and after construction. Fortunately, excavation along this portion of the project is expected to be minimal, limited to the petroleum pipeline easement and three small sections along the surface tightline alignment. Potential erosion in these areas during construction can be reduced by following commonly accepted Best Management Practices such as diverting surface water away from excavations, and establishing a protective cover over the disturbed areas and revegetating the areas as well. Disturbed portions of the site where the pipe is buried or where construction equipment has disturbed the ground surface should be seeded, then covered with straw or a rolled erosion control product, such as Curlex®excelsior blankets, following backfill placement. The Curlex® should be installed in accordance with the manufacturer's recommendations. Straw may be utilized in the relatively level area adjacent to the pond access road and the petroleum pipeline easement. Sloping portions of the site, or the area in close proximity to the stream, should be covered with Curlex®. Landslide Hazard Steep slopes along the proposed alignment include the relatively short section extending between the pond access road and the petroleum pipeline easement, and the ravine's south slope, along which the tightline will be installed. Slope stability is influenced by a number of conditions, including slope inclination, subsurface soil and groundwater conditions, and surface water drainage. Review of published geologic maps, conditions observed at the exploration locations, and surface observations have lead us to conclude that the site is primarily underlain at relatively shallow depths by glacially consolidated soils that are generally not subject to deep- seated instability. However, the near surface weathered soils, and fill materials, can be destabilized by unfavorable surface water conditions. Zipper Zeman Associates,Inc. 19231 36'1i Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 Proposed Sunnydale Downstream SIP ' ` J-686 Renton, Washington 10 May 2000 Page 10 Two adjacent rockery-like features comprising large rock placed on the slope adjacent to the detention pond, southwest of the upper control manhole as shown on Figure 2, were observed during the field exploration. The uppermost rockery extended approximately 25 to 50 feet along the future new buried pipe alignment, and was approximately 4 feet high. The lower rockery was approximately 8 feet away from the upper one, had a 12-foot width, and was about 6.5 feet high. Based upon our field measurements, it appears that the existing storm line from the manhole to the lower catch basin may be underneath the uppermost rockery. The rock feature, and surrounding areas, lacked evidence of recent instability or significant groundwater seepage. The City of Renton provided copies of two letters that addressed conditions leading to installation of the rock fill feature, as listed below: • Earth Consultants, Inc.; Site Reconnaissance, Slope Failure West of Lot 170, Sunnydale Mobile Home Park, Renton, Washington; E-1894-4, 28 December 1994; • Harza Consulting Engineers and Scientists; Sunnydale Mobile Home Park, Slope Erosion, Renton, Washington; File 7160G, 12 December 1994. The letters describe the authors' opinions regarding conditions leading to the formation of a relatively small landslide and/or erosional feature on the slope between the pond access road and the petroleum pipeline easement below, west of the storm sewer. Both authors reference some groundwater seepage from the exposed soils in the feature, and apparent flow of surface water from the pond over the steep slope. Both authors recommended similar repairs — filling the disturbed area with large rock or constructing rockeries. Based upon our review of the referenced letters, and conditions observed during the field exploration, we tend to agree with the conclusions presented in the Harza letter. We find it likely that the slope degradation was resultant from a combination of surface water flow over the steep slope combined with seepage from the underlying fill material. Deep-seated instability of the underlying glacially consolidated soils does not appear to have contributed to the distress. The rock fill repair appears to have been effective as well. Conditions observed at the location of our boring B-2, and observations noted in the referenced letters, confirmed the presence of fill material along the top of the slope separating the pond and the petroleum pipeline easement. The fill soils would be susceptible to erosion by flowing water, such as if the pond were to overflow, or if surface water were directed over the slope in a concentrated fashion. However, it is our opinion that the steep slope is unlikely to degrade due to instability of the underlying native glacially consolidated soils. The proposed surface alignment of the tightline on the south side of the ravine below the petroleum pipeline easement follows, or is in close proximity to, slopes with inclinations as steep as about 70 percent. Based upon our understanding of site conditions, it is our opinion that the proposed tightline alignment may be considered stable in regard to deep-seated instability. However, the steep slopes are characterized by a shallow weathered soil zone, up to about 3 feet Zipper Zeman Associates,Inc. 19231 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 ; rProposed Sunnydale Downstream SIP - J-686 Renton, Washington 10 May 2000 Page 11 deep, that can be susceptible to downslope displacement in the form of slow creep, or more rapid movement, particularly during episodic storm events. The slow downslope soil displacement, referred to as solifluction, results in intermittent soil movement that can be evidenced by curved tree trunk growth, for example. That portion of the proposed tightline alignment between approximately Stations 4+50 and 5+50, as shown on Figure 2, is interpreted to susceptible to shallow soil creep. Two shallow depressions along the proposed tightline alignment are interpreted to have been subject to shallow displacement of the upper weathered soil horizon. The interval located between Stations 3+42 and 3+86 is interpreted as lacking the surficial weathered zone due to past shallow movement; most likely due to shallow soil saturation during a storm event, in our opinion . A second section between Stations 4+10 and 4+50 exhibits evidence of shallow downslope soil displacement. The root mass of a large fallen tree at this location suggests that displacement of the root mass initiated the soil movement, in our opinion. Future landsliding at the toe of the ravine slopes is likely, in our opinion, as the stream channel continues to erode soils in the streambed and channel sides. It is our opinion that erosion-induced landsliding along the channel would be manifested as high angle slump-type features resulting in oversteepened slopes along the channel. Upslope migration of such features is not likely to occur suddenly, in our opinion. Seismic Hazard A seismic hazard generally applies to an area that may experience distress due to soil strength loss during the cyclic earth movement associated with a seismic event. This soil strength loss phenomenon is referred to as liquefaction. Liquefaction is most commonly associated with loose and soft, relatively fine grained soils in combination with a high moisture content, typically in association with a shallow water table. It is our opinion that the glacially consolidated soils in the upland and ravine portions of the site would not be susceptible to significant strength loss due to liquefaction associated with a seismic event. The existing fill materials and colluvium disclosed by test pits TP-1 and TP-2 were relatively coarse and dense, and would not display significant soil strength loss during a seismic event, in our opinion. HDPE Tightline Considerations It is our understanding that current plans for the new surface tightline preclude utilizing the same alignment currently occupied by the 18-inch CMP. Use of an alternative alignment will allow eliminating installation of a structure and sharp turn in the alignment, avoiding the construction and maintenance problems exemplified by the current arrangement that employs a manhole constructed above the steam bed. Zipper Zeman Associates,Inc. 19231 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 • Proposed Sunnydale Downstream SIP k`` h �I T J-686 Renton, Washington ad.,) y. F 10 May 2000 Page 12 The proposed surface tightline alignment as shown on Figure 2 generally reflects one that was field flagged during a site walk with representatives of the City of Renton and Entranco. The alignment was selected due to its combination of length, favorable slope conditions, and proximity to the existing alignment. It is our opinion that the alignment traverses terrain that is generally stable, and is not likely to be subject to deep-seated slope instability. The proposed alignment is also favorable in that it does not appear that substantial mechanical anchorage of the pipe is warranted. The pipe will have several fixed attachment points, including the catch basin on the downhill side of the petroleum pipeline easement, the lower buried section beginning about 150 feet upslope of the energy dissipator, and three sections between Station 3+42 and 4+10 where shallow burial is recommended. We recommend that two mechanical anchorage points be installed at approximately Stations 4+50 and 5-S. We recommend that the mechanical anchorage consist of a 2-inch inside diameter, Schedule 80, galvanized steel pipe driven into the ground a minimum 8-foot distance on the downhill side of the tightline. The tip of the pipe may be flattened or equipped with a conical tip to facilitate achieving the recommended minimum embedment depth. We recommend that the pipes be driven with a jackhammer. We recommend that the tightline be regularly inspected after installation to verify that fallen trees, mass wasting, or vandalism have not adversely affected operation of the pipe. Several fallen trees of substantial size were observed within the ravine during our field visits. While we have found most HDPE pipe installations to hold up well under tree impact, regular inspection and maintenance is recommended. Utility Trenching and Backfilling The soils disclosed by the explorations can be excavated with conventional hydraulic excavation equipment, in our opinion, without exceptional difficulty. The soils disclosed by hand excavations along the surface tightline alignment can be excavated with normal hand tools, in our opinion. We recommend that utility trenching, installation, and backfilling conform to all applicable Federal, State, and local regulations such as WISHA and OSHA regulations for open excavations. In order to maintain the function of any existing utilities, we recommend that temporary excavations not encroach upon the bearing splay of existing utilities. The bearing splay of existing utilities should be considered to begin 3 feet away from the widest point of the pipe and extend downward at a 1H:1V slope. If, due to space constraints, an open excavation cannot be completed without encroaching on a utility, we recommend shoring the new utility excavation with a slip box or other suitable equipment. It appears that an open sided excavation will be required adjacent to the repaired slope failure near the upper manhole. We recommend that the existing rocks be carefully dismantled one by one, not mass excavated. Conditions should be carefully evaluated as the rocks are removed, as the existing CMP may be exposed during this process. The contractor should be Zipper Zeman Associates,Inc. 19231 36`1'Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 Proposed Sunnydale Downstream SIP E J-686 Renton, Washington 10 May 2000 Page 13 prepared to address leakage from the pipe, or seepage from the excavation, as the process proceeds. Reconstruction of this segment of the alignment is discussed subsequently. We recommend that pipe subgrades be firm, unyielding and free of all soils that are loose, disturbed, or pumping. Such soils should be removed and replaced with compacted structural fill. After a firm subgrade has been established, we recommend that a minimum of 3 inches of bedding material be placed in the trench bottom if cobble or boulder size material is exposed. Otherwise, bedding for the HDPE pipe would not be necessary. Bedding material for plastic pipe should conform to Section 9-03.16 of the 2000 WSDOT Standard Specifications for Road, Bridge, and Municipal Construction (Publication M41-10). All trenches should be wide enough to allow for compaction around the haunches of the pipe. Otherwise, materials such as controlled density fill (CDF) or pea gravel could be used to eliminate the required compaction around the pipe. Backfilling the remainder of the trenches could be completed with soils excavated from the excavations if they can be compacted to the minimum levels recommended in the Structural Fill section of this report. Wet-of-optimum soils excavated from utility and structure excavations could only be used as backfill by reducing the moisture content to within a few percent of optimum. Limited test pit sidewall caving was observed during the field excavation. Contractors responsible for excavations should be prepared to provide adequate temporary shoring. Groundwater seepage was observed at the locations of test pits TP-1 and TP-2. The contractor should be prepared to adequately dewater excavations, allowing pipe and structure installation and backfill placement. We anticipate that sumps and pumps would be adequate for dewatering in the vicinity of the energy dissipator. The disassembled rockfill or rockery on the slope below the detention pond access road should be reconstructed in general accordance with the details shown on the Rockery/Rock Buttress Schematic, Figure 3. Some variation from these details may be necessary, depending upon conditions observed during construction. Provided that the slope protection can be installed with a finished height no taller than 8 feet, it may be constructed as a rockery. The rockery should be constructed of a sound, durable rock with a batter no steeper than 6H:1V. The bottom course of each rockery should be founded in at least medium dense or very stiff native soils. If the finished slope height is greater that 8 feet, we recommend that the slope be constructed as a rockery, but that a finished rock face surface with a 1.5H:1 V inclination be constructed. The new HDPE pipe behind the rock facing should be placed upon a 3-inch minimum bedding thickness, as referenced above, in turn placed above 2 to 4-inch crushed rock quarry spalls (WSDOT 9-13.6) or shoulder ballast [WSDOT 9-03.9(2)]. The coarser crushed rock material should be utilized as backfill for the new trench behind the facing rocks, and be placed behind the facing rocks as they are installed. Zipper Zeman Associates,Inc. 19231 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 y Yf; T Proposed Sunnydale Downstream SIP J-686 Renton, Washington 10 May 2000 Page 14 Structural Fill All fill material placed in excavations for buried pipes and structures should be placed in accordance with the recommendations herein for structural fill. All structural fill should be generally free of organic material, debris, or other deleterious material. Individual particle size should generally be less than 6 inches in diameter. Structural fill should be placed in lifts no greater than 12 inches in loose thickness and each lift should be compacted to at least 90 percent of the modified Proctor maximum dry density as determined by the ASTM:D-1557 test procedure. We recommend that a geotechnical engineer, or his representative, be present during grading so that an adequate number of density tests may be conducted as structural fill placement occurs. In this way, the adequacy of the earthwork may be evaluated as it proceeds. The suitability of soils for structural fill use depends primarily on the gradation and moisture content of the soil when it is placed. As the amount of fines (that soil fraction passing the U.S. No. 200 sieve) increases, soil becomes increasingly sensitive to small changes in moisture content and adequate compaction becomes more difficult, or impossible, to achieve. Generally, soils containing more than about 5 percent fines by weight (based on that soil fraction passing the U.S. No. 4 sieve) cannot be compacted to a firm, non-yielding condition when the moisture content is more than a few percent from optimum. The optimum moisture content is that which yields the greatest soil density under a given compactive effort. At the time of the subsurface evaluation, some of the site soils disclosed by boring B-2, and test pits TP-1 and TP-2, generally had moisture contents above their optimum moisture content relative to their possible use as structural fill. However, soil moisture conditions should be expected to change throughout the year. Much of the site's native soil contains a significant fine-grained fraction. Re-use se of the on-site silt and silty fine sand soils disclosed by these explorations as structural fill will require that strict control of the moisture content be maintained during the grading process. Selective drying of over-optimum moisture soils may be achieved by scarifying or windrowing surficial materials during dry weather. Soils that are dry of optimum may be moistened through the application of water and thorough blending to facilitate a uniform moisture distribution in the soil prior to compaction. We recommend that the relic topsoil materials disclosed by test pits TP-1 and TP-2 be segregated from the mineral soil prior to re-using the excavated soils as backfill material. While not encountered in significant amounts at our exploration locations, deleterious debris in fill material may be present in close proximity to the detention pond access road. Debris materials should be segregated from the mineral soil and wasted from the site. Zipper Zeman Associates,Inc. 19231 36'1'Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 • Proposed Sunnydale Downstream SIP [ram' '_. 1.J J-686 Renton, Washington 10 May 2000 Page 15 In the event that debris content, inclement weather, or wet site conditions prevent the use of on-site soil or non-select material as structural fill, we recommend that a "clean", free- draining pit-run sand and gravel be used. Such materials should generally contain less than 5 percent fines, based on that soil fraction passing the U.S. No. 4 sieve, and not contain discrete particles greater than 6 inches in diameter. Controlled Density Fill (CDF) would be a feasible alternative to compacted structural fill, and is most commonly used to backfill confined areas such as utility trenches. The use of CDF to backfill the trench crossing of the petroleum pipeline easement would facilitate that process and reduce the amount of time the trench remains open. It should be noted that the placement of structural fill is, in many cases, weather- dependent. Delays due to inclement weather are common, even when using select granular fill. We strongly recommend that subsurface utility work be scheduled for the drier months, if at all possible. We recommend that the site earthwork budget provide provisions for import granular fill material. Temporary and Permanent Cut Slopes Temporary slope stability is a function of many factors, including the following: 1. The presence and abundance of groundwater; 2. The type and density of the various soil strata; 3. The depth of cut; 4. Surcharge loadings adjacent to the excavation; 5. The length of time the excavation remains open. It is exceedingly difficult under the variable circumstances to pre-establish a safe and "maintenance-free" temporary cut slope angle. Therefore, it should be the responsibility of the contractor to maintain safe slope configurations since the contractor is continuously at the job site, able to observe the nature and condition of the cut slopes, and able to monitor the subsurface materials and groundwater conditions encountered. It may be necessary to drape temporary slopes with plastic or to otherwise protect the slopes from the elements and minimize sloughing and erosion. We do not recommend unshored vertical slopes or cuts deeper than 4 feet if worker access is necessary. The cuts should be adequately sloped or supported to prevent injury to personnel from local sloughing and spalling. The excavation should conform to applicable Federal, State, and local regulations. Based upon our review of WAC 296-155-650, Part N (Excavation, Trenching, and Shoring), we have interpreted the site soils disclosed by the explorations to meet the following type definitions: • Type A: Dense to very dense or hard, undisturbed glacial glacially consolidated soils with no groundwater seepage; • Type C: Existing fill, colluvium, loose to medium dense granular soils. Zipper Zeman Associates,Inc. 19231 36"'Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 • Proposed Sunnydale Downstream SIP T F` �� *� J-686 Renton, Washington "u 10 May 2000 Page 16 Structure Foundation Recommendations Current plans call for constructing an energy dissipator adjacent to the stream channel at the bottom of the site. The structure will likely comprise a 72-inch pre-cast manhole with internal plumbing to allow water from the lower buried section of HDPE pipe to well upwards and flow over into the stream. We understand that the structure will require an excavation approximately 8 feet deep. Test pit TP-2 was excavated in close proximity to the proposed structure location. The test pit disclosed stiff to very stiff sandy silt with some gravel and interbedded sand, and medium dense gravelly sand to sandy gravel with some silt at the anticipated structure invert depth. These soils are adequate for support of the structure, in opinion. However, the sandy silt and silty sand soils would be easily disturbed when wet. We recommend that the excavation subgrade be mantled with a minimum 1-foot thickness of crushed rock shoulder ballast or quarry spalls as described for the rockery and rock buttress construction. The lift of coarse granular material will serve as a leveling course and working surface. In the event that debris, organic materials, or soft or loose material are encountered at structure subgrade elevation, we recommend that the material be removed and replaced with the shoulder ballast or quarry spalls. Site Disturbance Some of the native and fill soils that will be exposed during construction contain a significant percentage of fine-grained particles. Relatively clean sands are also present at or very near the ground surface. These soils are susceptible to disturbance, particularly when wet. We recommend that the contractor make every effort to minimize disturbance of stripped surfaces, and to limit site disturbance to those areas within the clearing and/or work limits. These efforts may include directing surface water away from open excavations, and utilization gravel-covered surfaces for construction equipment traffic and material storage. In addition, vehicle traffic over wet subgrades or prepared areas should be minimized. The steep slopes along the proposed surface tightline alignment would be susceptible to disturbance by tracked or wheeled construction equipment. We recommend that use of such equipment be prohibited during construction. Placement of the HDPE tightline utilizing winching techniques that preclude use of wheeled or tracked equipment on or in close proximity to the steep slopes is feasible, in our opinion. CLOSURE The conclusions and recommendations presented in this report are based on the explorations accomplished for this study. The number, location, and depth of the explorations for this study were completed within the site and scope constraints of the project so as to yield the information necessary to formulate our recommendations. Zipper Zeman Associates,Inc. 19231 36"'Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771 -3304 Proposed Sunnydale Downstream SIP .#''° '` ' Ili it J-686 Renton, Washington 10 May 2000 Page 17 We recommend that Zipper Zeman Associates, Inc. be retained to provide geotechnical engineering services during the earthwork phases of the project in the event that the City of Renton requires assistance in this area. If variations in the subsurface conditions are observed at the time of construction, we would be able to provide additional geotechnical engineering recommendations to the contractor and design team in a timely manner as the project construction progresses. We appreciate this opportunity to be of service to you, and would be pleased to discuss the contents of this report or other aspects of the project with you at your convenience. Respectfully submitted, Zipper Zeman Associates, Inc. David C. Williams Associate 4 1 John E. Zipper, P.E. Principal Enclosures: Figure 1 —Vicinity Map Figure 2—Site and Exploration Plan Figure 3 —Rockery/Rock Buttress Schematic Appendix A—Field Exploration Procedures and Logs Appendix B -Laboratory Testing Procedures and Results Distribution: Entranco (1) Zipper Zeman Associates,Inc. 19231 36th Avenue West,Suite B201 Lynnwood,Washington 98036 (425)771-3304 , , , , _, . - , .__..,., L -R, FPW-_--.1.K._--1.31rt ,,,, !' ..,' V FI . ' '' 1':':_ - .mum /lam\® 1��� mom" . :: ��;Y 7eG�.t ' a „ „-- Y . : . eta.,7 •. ! • , ��f �r.YL�CL iYdrTSI LL ie • I•• TF Eh - 11 '', •Y { 17.P.'t t?. 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PROJECT NO.J-686 PROPOSED SUNNYDALE SIP DATE:APRIL 2000 RENTON,WASHINGTON DESIGN:DCW GEOTECHNICAL AND ENVIRONMENTAL DRAWN BY:JPG SITE VICINITY MAP CONSULTING SCALE:UNKNOWN FIGURE 1 �', } 0 B-1 Boring number and approximate location.Borin; 4:4 A., advanced utilizing conventional mechanical holl' #44)4) stem auger drilling methods. K�� 41 ®HB-1 Hand boring number and approximate location. /�i ii Boring advanced utilizing hand tools. ® TP-1 Test pit number and approximate location. • a sr �1j lif�J_ H 4m Au •114iiii .,....„44 •4#44.t.444411,0y.! Ilk\ilkib.:\:gull/ i 47•J' ': AO' :, ,, '41e1/4 A.-:.,i_q.Av ! . 5711- 44-1Z 1 I If 1'0 • 17 4. 4 41 0 PA ' liviaidion. c-) 41, :'-!IVIII _1 . 15 1 = f 1 - j I • 2 � 1 • • i . 1 1 / ' - • • -. PROJECT NO.J-686 PROPOSED SUNNYDALE SIP DATE:APRIL 2000 RENTON,WASHINGTON DESIGN:DCW • 1TAL DRAWN BY:JPG SITE VICINITY MAP SCALE: 1"=40' FIGURE 2(PAGE I OF 2) Reference:Undated Preliminary Survey Data prepared by Entranco. • TCP • � MC IMIX s6 x . �v . 1 '1fr*" • 1,-- ,., ...._ 0 �,� . EASEMENT fa" ... . Mr, � _�T.� i DALE ir. _. „ 04:"--40 jor:Pe :, ,o, r,: 8141i . EP 11110p...ATO11111111,111 • . c;)) "Aar - 7 '.o • . -4 • . • — 10' SANITARY SEWER EASEMENT AF #8405110646 / • 300.000 si 1 • " • • • LEGEND 0 B-1 Boring.number and approximate to advanced utilizing conventional MI stem auger drilling methods. • ®HB-1 Hand boring number and approxim Boring advanced utilizing hand toc ®TP-1 Test pit number and approximate k •C. PROJECT NO.J-686 PROPOSED SUNNYDALE SIP DATE:APRIL 2000 RENTON,WASHINGTON DESIGN:DCW vTAL DRAWN BY:JPG SITE VICINITY MAP • • SCALE: 1"=40' FIGURE 2(PAGE 2 OF 2) ROCKER' ( BUTTRESS SCHEMATIC -1 0 SCALE FLATTER) SOUND, DURABLE 1 �- - - ��)) NON-WEATHERED ROCK �".'�/ 7 44 1 TO 2 MIN " • •••• /�/ 16 IN. ~ : FREE-DRAINING BACKFILL r. ' (MAX. 5% FINES); MIN.35 , _ ' WIDE LAYER OF 2"-4" • QUARRY SPALLS • .. • ADJACENT TO ROCKERY • , 6 •;' :. :,' HEIGHT • • ,r 1 . (MAX. 8') - •' • • ••1• ••, ' • .. ••• • . 18-INCH INSIDE DIAMETER , • ' HDPE TIGHTLINE • MINIMUM • • J WIDTH (FT) - MIN. 12" = HEIGHT/3 FIRM, UNDISTURBED SOIL NOTES: ROCK SHALL BE SOUND AND HAVE A MINIMUM DENSITY OF 160 POUNDS PER CUBIC FOOT. THE LONG DIMENSION OF ALL ROCKS SHALL BE PLACED PERPENDICULAR TO THE WALL EACH ROCK SHALL BEAR ON TWO ROCKS IN THE TIER BELOW. ROCKERIES ARE EROSION-CONTROL STRUCTURES, NOT RETAINING WALLS. NATIVE MATERIAL MUST BE STABLE AND FREE-STANDING IN CUT FACE. FOR HEIGHTS GREATER THAN.8 FEET, FACING.ROCK MAY BE STACKED IN FRONT WITH A 1.5H:1V 'INCLINATION LOCATION OF ROCKERY OR BUTTRESS RELATIVE TO TIGHTLINE SHOULD BE'FIELD-FIT • ZIPPER ZEMAN ASSOCIATES,INC. PROJECT NO. 1-686 PROPOSED SUNNYDALE SIP DATE: APRIL 2000 RENTON,WASHINGTON GEOTECHNICAL AND ENVIRONMENTAL DESIGN: DCW DRAWNBY: DCW ROCKERY/ROCK BUTTRESS SCHEMATIC CONSULTING SCALE: N.T.S. FIGURE 3 • d q APPENDIX A FIELD EXPLORATION PROCEDURES AND LOGS DnAFT APPENDIX A FIELD EXPLORATION PROCEDURES AND LOGS J-686 Our field exploration for this project included two test pits (TP-1, TP-2) excavated on 21 March 2000, and two borings (B-1, B-2) and four hand borings (HB-1 through HB- 4) advanced on 24 March 2000. Approximate exploration locations are shown on the Site and Exploration Plan, Figure 2. Exploration locations were determined by measuring distances from existing site features with a fiberglass tape relative to an undated topographic map of the site provided by Entranco As such, the exploration locations should be considered accurate to the degree implied by the measurement method. The approximate ground surface elevation at each exploration-location was determined by interpolating the information provided on the topographic plan, or via hand level methods relative to specific surveyed site features, such as manholes. The following sections describe our procedures associated with the exploration. Descriptive logs of the explorations are enclosed in this appendix. Soil Boring Procedures Our exploratory borings were advanced with a hollow stem auger, using a portable drill rig operated by an independent drilling firm working under subcontract to our firm. A geotechnical engineer from our firm continuously observed the borings, logged the subsurface conditions encountered, and obtained representative soil samples. All samples were stored in moisture-tight containers and transported to our laboratory for further visual classification and testing. After each boring was completed, the borehole was backfilled. Throughout the drilling operation, soil samples were obtained at 2.5- to 5-foot depth intervals by means of the Standard Penetration Test(ASTM: D-1586). This testing and sampling procedure consists of driving a standard 2-inch outside diameter steel split spoon sampler 18 inches into the soil with a 140-pound hammer free falling 30 inches. The number of blows required to drive the sampler through each 6-inch interval is recorded, and the total number of blows struck during the final 12 inches is recorded as the Standard Penetration Resistance, or "blow count" (N value). If a total of 50 blows is struck within any 6-inch interval, the driving is stopped and the blow count is recorded as 50 blows for the actual penetration distance. The resulting Standard Penetration Resistance values indicate the relative density of granular soils and the relative consistency of cohesive soils. The enclosed boring logs describe the vertical sequence of soils and materials encountered in each boring, based primarily upon our field classifications and supported by our subsequent laboratory examination and testing. Where a soil contact was observed to be gradational, our logs indicate the average contact depth. Where a soil type changed - niap AFT between sample intervals, we inferred the contact depth. Our logs also graphically indicate the blow count, sample type, sample number, and approximate depth of each soil sample obtained from the borings, as well as any laboratory tests performed on these soil samples. If any groundwater was encountered in a borehole, the approximate groundwater depth, and date of observation, is depicted on the log. Groundwater depth estimates are typically based on the moisture content of soil samples, the wetted portion of the drilling rods, the water level measured in the borehole after the auger has been extracted, or through the use of an observation well. Hand Boring Procedures Four hand borings (HB-1 through HB-4) were advanced at the approximate locations shown on the Site and Exploration Plan, Figure 2. An engineering geologist from our firm advanced an approximately 8-inch diameter boring by hand using a post- hole digger, continuously observing the soil cuttings as they were retrieved. Representative portions of the soils retrieved were placed in moisture tight containers and returned to our laboratory for further visual classification and testing. Logs of the hand borings are included in this appendix. Test Pit Explorations An independent contractor working under subcontract to our firm excavated the test pits through the use of a small trackhoe. An engineering geologist from our firm continuously observed the test pit excavations, logged the subsurface conditions, and obtained representative soil samples. The samples were stored in moisture tight containers and transported to our laboratory for further visual classification and testing. After we logged each test pit, the operator backfilled each with excavated soils tamped into place. Some settlement of the backfill should be expected over time. The enclosed test pit logs indicate the vertical sequence of soils and materials encountered in each test pit, based primarily on our field classifications and supported by our subsequent laboratory testing. Where a soil contact was observed to be gradational or undulating, our logs indicate the average contact depth. We estimated the relative density and consistency of in situ soils by means of the excavation characteristics and by the sidewall stability. Our logs also indicate the approximate depths of any sidewall caving or groundwater seepage observed in the test pits, as well as all sample numbers and sampling locations. IllkR ZEMAN ASSOCIATE'_ _ 'NC. DRAFT 19231 36 Ave.W.Suite B201,Lynnwood,Washington 98036 Hand Boring HB-1 Project: Sunnydale SIP Location: Tightline STA 1+30,see Figure 1 Project No: J-686 Approximate ground surface elevation(feet): 220 Date Drilled:24 March 2000 Depth Material Description Sample Nc %M Testing (ft) 2±inches ORGANIC FOREST DUFF above loose,wet,brown, gravelly SAND with trace silt and some roots 1 Loose,wet,brown,silty SAND with trace gravel S-I 22 2 Medium stiff,wet,brown with orange mottling, sandy SILT with 3 trace fine and fibrous organic material Stiff to very stiff,wet,brown,sandy SILT 4 Total depth=3.8 feet 5 No caving,slight seepage at 2.7 feet 2__ IlltR ZEMAN ASSOCIATIP NC. . 19231 36TH Ave.W.Suite B201,Lynnwood,Washington 98036 f /1 i• Hand Boring HB-2 Project: Sunnydale SIP Location: Tightline STA 2+55,see Figure 1 Project No: J-686 Approximate ground surface elevation(feet): 196 Date Drilled: 24 March 2000 Depth Material Description Sample Nc %M Testing (ft) 4±ORGANIC FOREST DUFF and soft,damp,dark brown,sandy SILT with fine organic material(Topsoil)above soft,wet,brown, 1 SILT with some sand and fine to medium roots 2 Medium dense,moist,brown with some gray mottling,fine SAND with trace fine to coarse gravel 3 S-1 21 4 Total depth=4 feet 5 No seepage or caving observed Z_s ';R ZEMAN ASSOCIA O NC. 19231 36TH Ave.W.Suite B201,Lynnwood,Washington 98036 DI A F T Hand Auger HB-3 Project: Sunnydale SIP Location: Tightline STA 3+65,see Figure 1 Project No: J-686 Approximate ground surface elevation(feet): 178 Date Drilled: 24 March 2000 Depth Material Description Sample Nc %M Testing (ft) 3±ORGANIC FOREST DUFF and soft,damp,dark brown,sandy SILT with fine organic material(Topsoil)above loose to medium 1 dense(at 2 feet),moist to wet,brown,gravelly SAND with trace to some silt,occasional cobbles to 5-inch diameter 2 S-1 8 3 4 Total depth=3.8 feet 5 No seepage or caving observed �� . . ER ZEMAN ASSOCIA*._ INC. 19231 36TH Ave.W.Suite B201,Lynnwood,Washington 98036 D L\ F Hand Boring HB-4 Project: Sunnydale SIP Location: Tightline STA 4+22 see Figure 1 Project No: J-686 Approximate ground surface elevation(feet): 172 Date Drilled: 24 March 2000 Depth Material Description Sample Nc %M Testing (ft) 3±ORGANIC FOREST DUFF and soft,damp,dark brown,sandy SILT with fine organic material(Topsoil)above loose,wet,brown, 1 silty,fine SAND with some fine roots 2 Dense,wet,brown,fine SAND with trace silt 3 S-1 28 4 Total depth=4 feet 5 No seepage or caving observed - i W1AFT Depth(feet) Material Description Sample No. TP-1 0.0—3.0 Surface brush atop loose to medium dense(at 2 feet),moist,dark brown/gray,silty S-1, S-2 gravelly SAND with some angular gravel,cobbles,roots and organics(fill). 3.0—6.0 Medium dense,moist,tan-brown,gravelly SAND with some silt(probable fill). S-3 6.0—6.5 Relic topsoil. 6.5—8.0 Stiff to very stiff,moist-wet,mottled brown/gray, sandy SILT with some gravel and S-4 interbedded silty SAND. 8.0— 11.0 Medium dense,wet,gray,silty SAND with some gravel and interbedded sandy S-5 SILT. Test pit terminated at 11.0-feet on 3/21/00. Location of boring approximately 30-feet west and 10-feet south of outfall. Slow seepage observed at 9.5-feet. No caving observed. Note: Adjacent creek grade approximately 6-feet below test pit surface grade. Ground surface elevation= 103 feet Depth(feet) Material Description Sample No. TP-2 0.0—3.0 Surface brush atop loose to medium dense,moist,tan-brown,gravelly SAND with S-1, S-2 some silt(fill). 3.0—3.5 Relic topsoil. 3.5—6.0 Soft to medium stiff,moist-wet,dark brown/gray/black,sandy SILT with some S-3 organics,and trace gravel. 6.0—8.0 Stiff to very stiff,moist-wet,mottled brown/gray,sandy SILT with some gravel and S-4 interbedded silty SAND. 8.0— 10.0 Medium dense,saturated,brown,gravelly SAND to sandy gravel with some silt. S-5 Test pit terminated at 10.0-feet on 3/21/00. Location of boring approximately 100-feet west and 10-feet south of outfall. Rapid seepage observed at 8-feet. Moderate caving observed below 6-feet. Note: Adjacent creek grade approximately 4.5-feet below test pit surface grade. Ground surface elevation=90 feet - _ . .... _ • D TD,), ni p I.— J - ._......., . . PRUjti.i: Sunnydale Downhill SIP JOB NO. J-686 BORING B-1 PAGE 1 OF 1 Location: Renton,WA Approximate Elevation: 289 feet Soil Description a Penetration Resistance w m E IT E Em Standard Blows per foot Other �° H o U) U) Z (..9 Z F 0 10 20 30 40 50 Hard(?),moist,brown,fine to coarse gravelly SILT S-1 I A 1 I I I I j I I 40/9" with some sand and organics(blow count may be overstated) T i , r•- 7 I — Stiff,moist,brown,gravelly SILT with some sand I I •.I" I I I T t•` I I I -I I I • Loose to medium dense,moist,brown,fine SAND S-2a 14, I 11 I —k with trace to some silt • 1 S-2b _-- __-- I I'• I I I I I 1 I I . 1 I I 5 I I ', I I I I I — Stiff to hard,moist,brown,SILT with occasional --- ---- S-3 1 ; - ;- • ; ; ; " 22 interbedded fine sand I I I •,1 I I I I 1 I I I I I I I I. I I I I I I ' I I 1 I — • - I I I I ' 1 I I I I S._4 I I I OA I I I 31 I I I 1 •` I I I r, I I I I •. 1 --- I I 1 I '�__ 1 I I 1 I I ', _ 10 I I I I I 'I. Grading to SILT with some fine sand S-5 I I I I I A 48 I I I 1 I I I I I 1 1 1 I 1 I I 1 Total depth=11.5 feet. I I I I I L 1 . No groundwater observed. I 1 I I I I I I I I 1 I J L I 1 L I . I I 1 I 1 I I I I I I 1 I J L I 1 L I I I 1 I I I I I 15 I I I 1 I I I I _________----- 1 J L I 1 L I . I I I I 1 I I 1 1 1 I 1 I _1L 1 1 L I . I I I I I I I I I I I I I 1 J L I 4 L I • I I I I I I I I I I I I I I I I I 1 I I I 1 I I 1 1 1 1 1 I I I I I I I I 20 I I 1 I I I I 1 1 1 I 1 I I }__I__-1__ f.__,_-y__ I I I I I I II- 1 I I I I 1 I 1 1 I I I I I I I 1 I I 1 1 1 - Y.__,__-1_ _ r__1__-, __r__,__. 1 I I I 1 1 I 1 I I I I I 1 I 1 I I I 25 I I I r I I I I Explanation 0 10 20 30 40 50 I2-inch O.D.split spoon sample Lab Testing Legend Moisture Content TE3-inch I.D Shelby tube sample ATT Atterberg Limit Plastic Limit Natural Liquid Limit 0 No Recovery GSA Grain Size Analysis I 0 V Groundwater level at time of drilling MC% Moisture Content >50% ATD or date of measurement Zipper Zeman Associates,Inc. BORING LOG Figure A-1 Geotechnical&Environmental Consultants Date Drilled: 3/24/00 Logged By: Eric Lim .. , , . •,._.. _ D N A ., , t--j, PROJECT: Sunnydale Downhill SIP �� JOB NO. J-686 BORING B-2 PAGE 1 OF 1 Location: Renton,WA Approximate Elevation: 312 feet Soil Description B.EL Penetration Resistance coa) - a E > E E o R c 12 C I- Standard Blows per foot Other j Z 0 Z 0 10 20 30 40 50 Medium dense,moist,dark brown,gravelly silty, S-1 I I I I 12 SAND and sandy GRAVEL with some silt(fill) i. , T I r 1 I I I 1 I I I I I I I I 15 GSA S-2— I I I I I I .1 I ' • 1 I I 1 __- --_- I I I I I I I 1 I I I I I 5 I I 1 I I I _-- _--- I I I I I I I I I TTT S_3 * I I 11 GSA — 1 I 1 I I I I I I I 1 I I I 1 I I I I - I 1 I I I I I I I • I I 1 I I I •I S-4 A 1 I I I I I I 12 I I I 1 I •'•I I I --- ---- •I I I 'J 1 I 1 I I I 10 1 I 1 I __- ____ I I I 1 S-5 t� 1 I I I I 16 GSA ,• 1 1 I I 1 I; 1 I I 1 I• 1 I I 1, 1 1 I 1 I - I 1' 1 I I I I I I I' I I I I S-6 ' 1 I 16 GSA I L 1 I I I ,I I I I 1 I 1 --- ---- I 1 'I J L I J L 1 . I . I I I I 1 I I 15 1 1 I I 1 --- I 14_1__J__L__1__J _ _L - _I__. ---- 1 S-7 I I I I I I I I 12 I '. I I I I 1 I I 1 `I J L J L I I 1 ,1 I I 1 I 1 1 I` I I I I I I Very stiff,moist,blue-gray SILT. + 1; J L I J L I I I I '• I I I I I I 1 I I 1 1 1 I I 1 •I 1 I 1 1 I I 1 ,1 1 I 1 I 1--I---I-- I I I I,• I I I I I 20 I I I I . 1 I 1 1 - --- ---- S-8 1 1 I 1 1 I 1 I 1 23 I 1 I I I I I I ___1__.f__1-_1__ f_ _I__y__r I 1 I I 1 I 1 1 I I I 1 1 I — Total depth=21.5 feet. +--I-- --r----- - -r --I-- No groundwater observed. 1 I 1 1 1 1 1 I +--I- --I-- r--1---- -I---1--- I I I I I I I I 1 I I I I 1 I I - I 1 I -1 r I 1 r I • I I I I I I I I I 25 I I 1 I I I 1 I Explanation 0 10 20 30 40 50 I2-inch O.D.split spoon sample Lab Testing Legend Moisture Content 3-inch I.D Shelby tube sample ATT Atterberg Limit Plastic Limit Natural Liquid Limit 0 No Recovery GSA Grain Size Analysis I • V Groundwater level at time of drilling MC% Moisture Content >50% ATD or date of measurement Zipper Zeman Associates,Inc. BORING LOG Figure A-2 Geotechnical&Environmental Consultants Date Drilled: 3/24/00 Logged By: Eric Lim ® AFc� APPENDIX B LABORATORY TESTING PROCEDURES AND RESULTS DRAFT APPENDIX B J-686 LABORATORY TESTING PROCEDURES A series of laboratory tests were performed during the course of the this study to evaluate the index and geotechnical engineering properties of the subsurface soils. Descriptions of the types of tests performed are given below. Visual Classification Samples recovered from the exploration locations were visually classified in the field during the exploration program. Representative portions of the samples were carefully packaged in moisture tight containers and transported to our laboratory where the field classifications were verified or modified as required. Visual classification was generally done in accordance with the Unified Soil Classification System. Visual soil classification includes evaluation of color, relative moisture content, soil type based upon grain size, and accessory soil types included in the sample. Soil classifications are presented on the exploration logs in Appendix A. Moisture Content Determinations Moisture content determinations were performed on representative samples obtained from the exploration in order to aid in identification and correlation of soil types. The determinations were made in general accordance with the test procedures described in ASTM: D-2216. The results are shown on the exploration logs in Appendix A. Grain Size Analysis A grain size analysis indicates the range in diameter of soil particles included in a particular sample. Grain size analyses were performed on representative samples in general accordance with ASTM: D-2487. The results of the grain size determinations for the samples were used in classification of the soils, and are presented in this appendix. [DR AF � GRAIN SIZE DISTRIBUTION ASTM D422 SIZE OF OPENING IN INCHES U.S.STANDARD SIEVE SIZE HYDROMETER 36" 12" 6" 3" 1 1/2" 3/4" 3/8" 4 10 20 40 60 100 200 100 I I I I I l 90 180 L7 W 70 } W 60 Z U. Z 50 — W • — U W 40— - a 30— — - — - 20 10_. I - I I i • I 0 I I it I 1000.00 100.00 10.00 1.00 0.10 0.01 0.00 GRAIN SIZE IN MILLIMETERS Coarse Fine Coarse Medium Fine Silt Clay BOULDERS COBBLES GRAVEL SAND FINE GRAINED Exploration Sample Depth (feet) Moisture(%) Fines(%) Description B-2 S-2, 3, 5, 6 2.5-12.5' 6 5 Sandy GRAVEL with some silt ZIPPER ZEMAN ASSOCIATES, INC PROJECT NO: J-686 PROJECT NAME: GEOTECHNICAL AND ENVIRONMENTAL DATE OF TESTING: 3/27/00 Sunnydale CONSULTING • APPENDIX B Project Location Sheets • APPENDIX B Project Location Sheets ink lir =ILf---- IV NE 12TH ST f' o$`r p p.RK 04) CO �� o z w NE � � �N Nf ae V 9000.4 y`s ENE a a a o z w 900 w NE 10TH ST SE Nm¢J2� z z 1STTM A z N 8TH ST ,z W xNE- < ¢ w f NE 1� z N Z Z Z �,� S� Z f w T N IPAL o 0 o Z RT a Z z Z L.T.a ¢ J Y Wz NSTHST W �^CC fa z a z0 a Q _I a_ ii- op 1) N 4TH ST y / 0 NE 4TH ST N of ��/ SS 3RD ST 503 ��� NE 900 + N `Id) J o < ,` w I- Ti9A z 1D ST ` 413) CF SUNNYDALE 1 �w� MOBILE HOME j D ST Q / P PARK ¢ P:n > C\- S 41110 zo ¢ •,n i ¢ �+ yh'J- SE 5TH ST z S 6TH ST AtPROJECT C * W w ¢ 0F` s n O� •ili ST' z N lb SS 7TH CT ST T LOCATION 0 .. L_ = o s _ CD�4R 4 RENTON at„ NCrav Np 1s9 se ...7 4Oiir o �qY 2 SF PUGET S 0 o z 0 0 0 v La i PROJECT TITLE: PROPOSED WORK: Sunnydale Downstream Replace existing damaged pipe, Storm System Replacement Project structures, and eroding outfall with ADJACENT PROPERTY OWNERS: new pipe, improved alignment and DIRECTIONS TO SITE: KingCountyoutfall location, and energy Take 1-405 South to Maple Valley dissipator. Hwy. (SR169), East on SR169 to SHEET TITLE: VICINITY MAP AT: Township 23N, Range 5E SE 5th. A maintenance access road to the site is located just SCALE: NOT TO SCALE Section 16 west of SE 5th. SHEET: 1 of 3 ASSISTANCE BY: Entranco a DATUM: City of Renton DRAWN BY: GLS DATE: May 2000 44 \ -�� - \. o — , Z L---- ""."". a - - pw \ ��N w� p �� \7,/ 0-V l - 0� 0 �— w in o z Q p0 w � Q � wZ J N wO � a 00� �,a'm w (BASED ON R W\\Atl _' /W M_ ' ED--- > \�_ WTATE P.N.R z Q- —. - - - \ -=�— .— __ _ _ m m 1/16TH LINE \'` _�---_ N---01'04'1 1 "JE (170.21 ' DEED) i ,� z 0� - .oar'-7wZ ���_ � \.i / wo • — c, tow ?_ wSF- \\\ -< w z F- no-►Qw \ 08 -�/i-- CC No u_ co B.P. . n p0)/�_ A EASEMENT 0 c �_id . L w PE(RNES ., _�-L\ E a _ viz w ..a NOFR --CI ERP\� _ o_ g E � _ 0 0oENi R \� ,_ -_ . _ wEAM150567 =;— To To LA 502 ; - \: 0 0 #g b _ rn 14-3m in Li ---------____\ 000 w 0 O00 - _--. -p \ 0 r9r � w a w _ ----. --- -V \ fn N N N m I w a O o� �_' -\-Q Ol(!) X w w W 0 a w _--`,-,--- w 0 N a 0- w W---0,z-- to_ V) 00 0 N O D co \w \ O W 6I-wSV (O ,.\ :\ \ W.^ \ ti \ \i7k \ \\°\\:N7N! :N\\: \ \\'\\\\\ \\\\ 11 \ \ \,,Tc‘i \ \\ , , , ,,,,,,,,‘,,. . s. :.:,,,,„....,..,,.,,.,,, ___ v.,,,,, , „„. „, ,\ \ \\\\\\ \s\‘64:7 -----------NN:, \ \\‘ \\ \\\\ ' \\\',I \, \\N\ \�\ \ \;;,� MATCHLINE PAGE 3 PROJECT TITLE: PROPOSED WORK: Sunnydale Downstream Replace existing damaged pipe, Storm System Replacement Project structures, and eroding outfall with ADJACENT PROPERTY OWNERS: new pipe, improved alignment and DIRECTIONS TO SITE: Kin Countyoutfall location, and energy Take 1-405 South to Maple Valley g dissipator. Hwy. (SR169), East on SR169 to SHEET TITLE: PLAN SHEET 2 AT: Township 23N, Range 5E SE 5th. A maintenance access rood to the site is located just SCALE: NOT TO SCALE Section 16 west of SE 5th. ASSISTANCE BY: Entranco SHEET: 2 of 3 DATUM: City of Renton DRAWN BY: GLS DATE: May 2000 `' '\\ `\_.....i_uw._.._ k ;\)\--;: �\�° \ \ ��, Z 1 MATCHLINE PAGE 2 ) \(/) x \ )II \\I N1 -, N\\\ . 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(SR169), East on SR169 to SHEET TITLE: PLAN VIEW 3 AT: Township 23N, Range 5E SE 5th. A maintenance access road to the site is located just SCALE: NOT TO SCALE Section 16 west of SE 5th. SHEET: 3 of 3 ASSISTANCE BY: Entranco DRAWN BY: GLS DATE: May 2000 t:. 2C . y-r, INTERFUND TRANSFER &/A- vO7i •nsfer Number. Date: , —(-1 General Description: SEPi nPPLK.il?IOt) f_ Department To Be Charged (Transfer Out-.From) p/e74760 Description Account Number WO/Function Amount 5 h/ . Poofitre,m Sloan solem `l2l-ocet(0/S5%00038,cS06�3,rs 6.5-3/51-sne> / 25Z7 X) i cpf c7 vest Pruett lea / Z Department Authorization: Department To Be Credited (Transfer In - To) ja(e p o : Description Account Number WO/Function Amount eel Vr � ,' ,7e J 3Vf ', 5z/0 /000-ad pcks i CM, 05;579, j0,y,2, / ,”53— J .f.(e Va ,3SS,w.D0. x'/q ,5)1ZZ 250,00 DEVELOPMENT f RT PLANNING Distribution: (� White: Finance Department J U N 0 1 2000 Yellow: Department to be Charged Pink: Department to be Credited RECNED REPT150 FEES COLLECTED PAGE 1 06/02/2000 08 :26 Detail Listing Post Date Range 06/01/2000 Thru 06/01/2000 Post Activity Receipt Init Method Notation Paid 06/01/2000 LUA00-070 R0002914 LN IOT INTERFUND XFER 1, 000.00 **************************************************************** City of Renton WA Receipt **************************************************************** Receipt Number: R0002931 Amount: 1,254 . 62 06/02/00 08 :26 Payment Method: IOT Notation: INTERFUND TRANS Init: JEJ Project #: LUA00-071 Type: LUA Land Use Actions Parcel No: 162305-9003 Site Address: 155 MONROE AV NE Total Fees: 1,254. 62 This Payment 1,254 . 62 Total ALL Pmts: 1,254. 62 Balance: . 00 **************************************************************** Account Code Description Amount 000 .345 . 81. 00 . 0007 Environmental Review 1, 000 . 00 000 .345 . 81. 00 . 0019 Variance Fees 250 . 00 000 . 05 .519 .90 .42 . 1 Postage 4 . 62 ® VC�pO&,, of FaTo VAi pi, UN® 12000