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Home My WebLink About03222 - Technical Information Report ,��,�Cli�1 j l�-r iC7�e{ � G��Y� �,� v �f�� c� ��Z S/o� N � TECHNICAI, INFQRMATION REPORT FOR LIBE�Z'I�Y Gl�OVE & LIBERTY GR4VE CUNTIGUUUS RECEIVED MAR � 4 2G05 C�� KING COUNTY Lakeridge Development LAPlD USE SERVICES P.O. Box 146 Renton, WA 98057 Phone: (425)228-9750 �ECEIVED PRI�;PARFD RX: MQY 0 6 2005 Daley-Morrow-Poblete, Inc. KING COUNTY 726 Auburn Way North LAND USE SERVICES Auburn,WA 98002 . Phone: (253)333-2200 FROJECT No. O 1-470 DATE: May 27, 2004 (ZEv1s EO: J AM.3,ZDbS ��v 1 N - q (�EVIS�D_ MRRC.H 23,ZanS � �t ' N� � R�vISED : MA�I 4 � 2oc�5 �' ��, �. " Q � 132 � � o,�,F �F �\��4, � �� EN Ex�s_ ,fAN. 9, 2006 � • - STAYP N07 VALIO UNLE55 SICNm AMp DA7FD k . 3z2� TABLE OF CONTENTS DESCRIPTION PAGE SECTION I—PR03ECT OVERVIEW Project Overview I vcinity Map 2 'I`IR Wort�t 3 -5 Sails Map 6 SECTION Ii--CONDITIONS AND REOUIREMENTS SUMMARY Report and Hecision for Libe�Grove 1 — l 7 Regort and Decision for Liberty Grove Contiguous 18—34 Drainage Adjustment and Shared gacility Pian approva!{File No.�,03V_Oa65) 35—37 Mitigated Determieatiou of Non-Significance for Libeity Grove 38—�0 M'iri'gated Determinaiion of IJcxi Significance for L'berty Grc�ve Contigucx�s 41 —43 Response ta Liberty Grove Plat Conditians 44-4b Response ta LiberEy Grwe Contiguoas Piat Conditions 47-50 Response to Draina�e Adjustment Conditions 51 S�CTION III—OFF-SFTE ANALYSIS Downstream Analysis 1 —87 SECTION IV-FLOW CONTRdL AND WATER QtIALTTY FACII.ITY AI�IALY3I5 AND DESIGN Existing Site Hydrology(Part A) I E�cisting Condition Basin Map 2 Pre-Developed Coaditian�eak Fiow Rate for�,iberty Grove 3 Pre-Developed Condirion Peak Flow Rate for Liberty Grove Contiguous 4 Upstream Basin North of Liberty Grove 5 Upstream Basin North of Liberty Grovs Conriguous b Cambined Titne Series 7 D�eveloped Co�itioo Kydro(ogy(Part B) 8-9 Developed Condition Basin Map 10 Developed Condition Peak Flow Rates for Liberiy E'rrove 11 Developed Gonditian Peak Piow Rates for Iabeitg Grove Contiguous i 2 Developed Condition Peak F}ow Raxes for Lats I8-23 I3 SE 136"'St_and 160'b Avenue SE-Bypass Areas I4 Deweloped Candition CombinEd Time Series I 5 Combined Time Se�ies for Bypass Areas 16 Performance Standards(1'art C} i 7 Flovv Co�}System(Part D} 17 Water Quality Sy�em(Part E} 18 Deiention Facility Desiga 19—26 �$�Y�P�l�ay Design 27 Vertical Grate D�sign 28 �is+er Design 29 Wetpond Desigri 30 Stage-Stcxage'�abte 30A A�atysis of�Vetland Hydrology 3I —37 I SECTION V—CONVEYANeE SYSTEM ANALYS�,S f1ND DESIGN Conveyance System Design—Backwater Anaiysis 1 -28 SECTION VI—SPECIAL REP4ItTS A�iD ST'UDIES � Wetland Evatuarion and Delineation Report and Witdlife Habitat Evaluation 1-39 Addencium to Wetiaad Evaluation and I)elineatian Report ancf Wildlife Habitat Evaluation 40-47 SECTION VII—OTHER PERMITS Transfer of density Credit Documentation I — I6 SECTTQN VIII—T.E.S.C. ANALYSIS AND DESIGN Narrative for FSC Plan 1 Sediment Pgnd Design 2-3 SECTION IX—BQND QUANTI't'IES ANl3 FACILTI'Y SLIMMARIES Bond Quaotities Worksheet 1 -9 Storm Facitity Summary Sheet 10— 11 Landscape Bond Quantity 1�orksheet 2 Z- 13 SECTION X—OPERATI4NS AND MAINTENANCE MANI�AL NIA � SECTION I � PROJECT OVERVIEW � I PROJECT OVERVIEW The proposed Liberty Grove and Liberty Grove Contiguous developments wilt be within three separate parcels, located near the northwest and southeast corners of the intersection of SE 136�' Street and 160`�Avenae SE. Liberty Grove is within Parcel 3664500141, which is located near the nortl�west corner of said intersection. Parcels 1457500085 and 1457500090, which are located near the southeast corner of the previously mentioned intersection, is where Liberty Grove Contiguous is located The parcels are within the NE and SE quarters of Section 14,Torvnship 23 North,Range 5 East, Willamette Meridian, in King County Washington. The project site is located within an area zoned R-4. Since both proJects will be developed at the same time, and in fact will sharethe same detenrion facility,this T.I.R analysis will be for both projects_ There is an existing house and shop within Liberty Grove, with the remainder of the site mostly covered with grass and some trees. LiberEy Grove is approximately 4.84 acres and generally drains to the south. There are two houses within Liberty Grove Contiguous, with associated structures. The 7.92-acre parcel is presently forested in the northeast comer, wit�the remainder of the site being dominated by pasture land. There is a wetiand area within the southwest comer of Liberty Grove Contiguous,which wili remain,and wili be protected by a 25-foot buffer. Site soils have been identified as Alderwood gravelly sandy loam by the U_S. Soil Conservation Service (SCS). The two developments involve the creation of sixty single-family residential lots combined. Access roads and roadway improvements will also be part of the development. The detention facility will be constructed in the southeast corner of Liberty Grove Contiguous, and will serve bath developments. A wetpond, sized per tbe Basic �Va#er Quality Menu,w�ill l�constructed t�low the detention facility. Discharge from the pond will be to the upgraded conveyance facilities along the east side of 160�Avenue SE. 0 i 11 � N 12 i � � Q � �_ SE 128TH TftEET I � - - - - - -J- - - � � � � � a w � � � i 14 Q °° > � 13 ; � SE 136TH ST � 0 I � S�E _ ��IBERTY � I F a co �H_S. > I I � `D I � `- MAPLE�OOD � I � HEIGHTS � � S PA K � � �� I � 14 —I- - -,�� - - - - - I �� I a �T� — �-- — — I I �� 8TM Sr I n REC ,�� I °` S 24 � s aons,"� ^ .� a9n+ ��" � 23 � I � �" � � P A� � (�T ONES R o�� oN M�� `� � � RO,� I ' I I I � � VICINITY MAP Scale: 1 " = 1 /2 MtLE � � King County Department of Development and.Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND PROJECT ENGINEER DESCRIPTION Project Owner Project Name �AKERiOGE L1�vECoPME"NT G/l�E�T y r�F v= G/QE�2Ty G/10vE Address P�• �'r �� Location �T/6vouS ,Q�vToN , i,vA 98os7 23 n/ Township Phone ��{Z.� 228-' 9 7S0 Range s E !V�.�Y...Section /� Project Engineer S�� IEL �. DA C E y f?E Company�ALE��M0,2,�OGtJ-��O�LETE:/�C. 72,G A[> U2i1/ CWF y � AddresslPhone s 33-2 'Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS APPLICATION ' t�Subdivison DFW HPA � Shoreline Management Short Subdivision COE 404 Rockery , Grading DOE Dam Safety Structural Vaults Commercial FEMA Floodplain Other Other COE Wetlands Part 5 SITE COMMUNITY AND:DRAINAGEBASIN Community /U�w C�STLF Drainage Basin L�� E�A2 �/(/E�Q Part 6 SITE GHARACTERISTICS River Floodplain Wetlands � Stream Seeps/Springs Critical Stream Reach High Groundwater Table Depressions/Swales Groundwater Recharge Lake Other Steep Slopes � a i� I Part 7 SOILS Soil Type Slopes Erosion Potential Erosive Velcoties ff 11�E,CW�.D�AqC) � � /5 � ��E'2A TE � Additional Sheets Attached �_ � I ' Part 8 DEV�LOPMENT LIMITATIONS I , � REFERENCE LIMITATION/SITE CONSTRAINT � j Ch. 4—Downstream Analvsis � Additional Sheets Attached Part 9 ESG REQUIREMENTS _ MINIMUM ESC RE�UIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION �Sedimentation Facilities ✓�tabilize Exposed Surface ✓ Stabilized Construction Entrance ✓ emove and Restore Temporary ESC Facilities �Perimeter Runoff Contro! v Clean and Remove All Silt and Debris ✓ learing and Graing Restrictions ✓ Ensure Operation of Permanent Facilities � ver Practices �Flag Limits of SAO and open space ✓ Construction Sequence preservation areas Other Other O i: . . :: ,_ , , . - .. ...- } . r . . . , . . . � , zr_ . .. � . . . .w�.��_.r��_� Part 10 SURFAGE WATER SYSTEM Grass Lined Tank Infiltration Method of Analysis Channel kG'�� Vault Depression Pipe System Compensation/Mitigati Energy Dissapator Flow Dispersal on of Eliminated Site Open Channel Wetland Waiver Storage Dry Pand Stream Regional —�� Wet Po�d Detention Brief Description of System Operation [�UNOjf ��/�.=F fZ)"`7 r2ofi� �- G/.��F�? GrzovE �ar�TiGvous !�- aE coi�� 4- co.��,�� hr� Facility Related Site Limitations ��'��2 Qvi4�� F'`��-�`! "��/'� Reference Facility Limitation �/a�r"J G�avE c�TI6l.�c�r Part 11 ` STRUCTURAL ANALYSIS Part:12 . EASEMENTSJTRACTS Cast in Place Vault Drainage Easement ✓ Retaining 11Vall ✓Access Easement Rockery>4' High Native Growth Protection Easement Structural on Steep Slope ✓ Tract Other Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information ovided here is accurate. i �. � C� D I i ned/Date � �. ;� .`�_� �,_;_ ..._�. _ . , — , . . , � ;- •v I I �� I W, � a J � � ' � � ' � ' • �. a � � I ; ; � �, �,� = x . � • , ;, � � , . � T � � �' i � ; � ,, � � � . .. . �� , �� '� „ •i , ' ° ° Q m� � . 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SECTION II CONDITIONS AND REQUIIZEMENTS SUMMARY February 23, 2004 OFFICE OF THE HEARING EXAMINER KING COUNTY,WASHINGTON 400 Yesler Way,Room 404 Seattle,Washington 98104 Telephone(206)296-4660 Facsimile(206)296-1654 REPORT AND DECISION SUBJL-CT: Department of Development and Environmental Scrvices File Nos. L03P0006/L03TY403 Proposed Ordinance Nos. 2004-0004; 2004-0006 LIBERTY GROVE Proposed Preliminary Plat and Proposal for Transfer of Density Credits Location: North of Southeast 136'�Street,between 160`h Avenue Southeast and 158th Avenue Southeast Applicant: Lakeridge Development Atfi: Wayne Jones P.O. Box 146 Renton,Washington 98057 Telephone: (425)228-9750 Intervenor: C.A.RE.,represented by Gwendolyn High 13405—158`�Avenue Southeast Renton,Washington 98059 i King County: Department of Development and Environmental Services,represented by Karen Scharer 900 Oakesdale Avenue Southwest Renton,Washington 98055-1219 Telephone: (206)296-7114 Facsimile: (206) 296-6613 SUMMARY OF DECISION/RECOMMENDATION: Department's Preliminary Recommendation: Approve, subject to conditions Department's Final Recommendation: Approve, subject to conditions(modified) Examiner's Decision: Approve, subject to conditions(modified) � L03P0006/I.03TI'403—Liberty Grove 2 EXAMINER PROCEEDINGS: Hearing opened: February 10, 2004 Hearing closed: February 10, 2004 Participants at the public hearing and the exhibits offered and entered are listed in the attached minutes. A verbatim recording of the hearing is available in the office of the King County Hearing Examiner. ISSUES/TOPICS ADDRESSED • Transfer of density credits • Surface water drainage • Road improvements • Safe walking conditions SUMMARY Application for transfer of a maximum of 5 density credits,and approval of a preliminary plat to subdivide approximately 4.84 acres into 241ots in the urban area,are granted preliminary approval. FINDINGS,CONCLUSIONS&DECISION:Having reviewed the record in this matter,the Examiner now makes and enters the following: FINDINGS: 1. GeneralInformation: Proponent: Wayne Jones,Jr. Lakeridge L7evelopment Inc. ' PO Box 146 ' Renton,WA 98057 I Phone:425-228-9750 'I e-mail:joneswayne@qwest.net � Representative: Mel L.Daley,P.E. �' I Daley-Monow-Poblete, Inc. Auburn Way North Phone: 253-333-2200 i Facsimile: 253-333-2206 II Intervenor: C.A.R.E.,represented by II Gwendolyn High 13405–158'"Avenue Southeast Renton,Washington 98059 I Location: Lying south of SE 136`�S�between 160'�Ave. SE and 162'�Ave. SE. Section/Township/Range: SE 14-23-OS Parcel#3664500141 Acreage Plat: 4.84 acres � L03P0006/L03TY40�Liberty Grove 3 Current Zoning: R-4 Number of Lots: Proposed-24 w/5 TDR Density: 5.2 dwellings per acre Lot Size: generally 6,000 square feet Proposed Use: single family Sewage Disposal: City of Renton Water Supply: Water District#90 Fire District: King County Fire District#25 School District: Issaquah Community Plan: Newcastle Drainage Subbasin: Lower Cedar River King County Permits: Rezone and Subdivision Complete Application Date: May 15,2003 (Date Plat Filed March 11,2003 &Rezone May 7,2004) Threshold Determination: Mitigated Determination of Nonsignificance(MDNS) Date of Issuance: December 16,2003 KC Pernut Contact: Karen Scharer,Project Manager II,Current Planning Section, LUSD Phone#296-7114 or e-mail at karen.scharer@metrokc.gov 2. Except as modified herein,the facts set forth in the DDES preliminary report to the Hearing Examiner for the February 10,2004,public hearing are found to be correct and are incorporated herein by this reference. Said report is exhibit no.4 in the hearing record. 3. The Applicant's request to reclassify the subject property from R4 to R6 was withdrawn prior to commencement of the hearing. 4. On February 4,2004 the King County Hearing Examiner issued his report and decision granting preiiminary approval for the revised piat of�vendell,based upon transfer o�2�density credits . that would allow for development of 701ots on 12.43 acres. This would provide a density of 5.6 dwelling units per acre on the Evendell property,which is directly south,across Southeast 136`h Street, from the subject property. The Examiner's decision approving the Evendell plat revision, File No. LO 1 P0016,is exhibit no. 33 in the hearing record of this proceeding. 5. Directly east,north and west of the subject property are suburban-sized lots,ranging from approximately 9,000 to 30,000 square feet in area. The maximum permitted density in the R4 zone classification is 6 dwelling units per acre,utilizing density incentives or transfened development rights. 6. King County's"Transfer of Development Rights(TDR)"program is govemed by Chapter 21A.37 of the King County Code. The TDR program establishes a property right which is separable from the fee-simple ride to certain lands within King County,and provides a method for the transfer and utilization of that new right,which is colloquially known as a development right or"density credit." A density credit has a substantial market value. The underlying purpose of the TDR program is to allow for the movement of residential density from rural areas to urban areas of King County. The code is intended to provide,"...an e�cient and streamlined administrative review system to ensure that transfers of development rights to 0 L03P0006/L03"CY403—Liberty Grove 4 receiving sites are evaluated in a timely way and balanced with other County goals and policies, and are adjusted to the specific conditions of each receiving site." KCC 21 A.37.010.2. Receiving sites are required to meet the provisions of KCC 21A.37.030. Those requirements are that the receiving site: 1. be within an unincorporated urban area,zoned R-4 or higher, or be within a potential annexation azea; 2. be within a city where new growth is or will be encouraged,and where facilities and services exist or public investments in facilities and services will be made; or 3. be within RA-2.5 and RA-5 zoned parcels,subject to stringent criteria. The subject property is within the first category of eligible receiving sites listed in KCC 21 A.37.030. Sites within the unincorporated urban growth area are not required to have any specific level of available facilities and services. Development approvals that utilize density credits must meet only those service criteria that apply generally to development of the number of dwelling units proposed on the site. King County Code chapter 21A.12 governs densities and development standards in residential zones. The R-4 zone in the urban residential area allows for a maximum density of six dwelling units per acre,which may be achieved only through the application of residential density incentives or transfers of development rights. KCC 21A.12.030.A. and B.1. When density credits aze used,development shall comply with dimensional standards of the zone having a base density most comparable to the total approved density. KCC 21A.37.030.B. 7. The foregoing provisions of the King County Zoning Code are generally consistent with policies of the King County Comprehensive Plan governing residential land use. In particular,the Zoning Code provisions aze generally consistent with: Policy U-113,that new residential development in the Urban Growth Area should occur where facilities and services can be provided at the lowest public cost and in a timely fashion; Policy U-114,that the County seek to achieve an average zoning density of at least seven to eight homes per acre in the Urban Growth Area through a mix of densities,allowing for lower density zones to recognize existing subdivisions with little or no opportunity for infill or redevelopment; Policy U-122 that supports increases in urban density through a rezone or a proposal to utilize density transfer,when the proposal will help resolve traffic,utility,parks or open space deficiencies in the immediate neighborhood. This proposal will improve traffic circulation in the area,will extend sewer service further into the urban area,and will provide recreation facilities and open space available to future residents on the subject property. 8. "The subject property is in the City of Renton's potential annexation area. The City is considering modifications to its comprehensive plan that would limit density on this property to a maximum O L03P0006/L03TY4�3—Liberty Grove 5 of 4 dwelling units per acre. However,those plan changes were not in effect at the time a complete application for this subdivision was submitted. 9. DDES and the Applicant have agreed upon right-of-way dedications and road improvements to mitigate the impact of tra�c which this proposal will generate adjacent to and in the immediate vicinity of the proposed development. The dedications and improvements include additional right-of-way and construction that will open and improve the north side of Southeast 136th Street, from 160th Avenue Southeast to 158th Avenue Southeast. This dedication and improvement will be matched on the south side of 136th Street by dedication and imprvvements to be constructed by the plat of Evendell. Additional improvements that will be made to Southeast 136th Street from 158th Avenue Southeast to 156th Avenue Southeast will result in a new east-west route from 160th Avenue Southeast to 156th Avenue Southeast. This new route will divert tra�c from the high accident intersection of Southeast 128th Street and 160th Avenue Southeast. The subject plat will atso provide improvements to the west side of 160th Avenue Southeast along the plat frontage,to the urban neighborhood collector standard. These improvements will incIude a sidewalk from the norih property line to Southeast 136'j'Street. 1Q. The Issaquah School District plans to operate a school bus stop for elementary school children at the intersection of Southeast 136th Street and 160th Avenue Southeast. The internal road improvements and frontage improvements on 160th Avenue Southeast will provide a safe route for children to use between the lots of this subdivision and that bus stop. I 1. Final plat approval shall require fulI compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location of lots as shown on the preliminary approved plat. Preliminary review has identified the folIowing conditions of approval which represent portions of the drainage requirements. All other applicable requirements in KCC 9.04 and the Surface Water Design Manual(SWDM)must also be satisfied during engineering and final review. a. Drainage plans and analysis shall compty with the 1998 King County Surface Water Design Manual and applicable updates adopted by King County. DDES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes,as established by DDES Engineering Review, shall be shown on the engineering plans. c. The following note shall be shown on the final recorded plat: "All building downspouts,footing drains,and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings# on file with DDES and/or the King County Depaitment of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems,the systems shal!be constructed at the time of the building permit and shall comply with plans on file." � �� L03P0006/L03TY403—Lberty Grove 6 d. The stormwater detention design shall comply with the Leve12 or Leve13 Flow Controi requirements,as applicable,per the 1998 King County Surface Water Design Manual (KCSWDM). (See SEPA conditions in condition no. 19.) e. The storm water control facility shall be located in a separate tract and dedicated to King County unless portions of the drainage tract are used for required recreation space in accordance with KCC 21A.I4.180. 12. A surface water drainage adjustment(no. L03V0065)has been approved for this proposal and the Liberty Grove Contiguous proposal(no. L03P0005). Stormwater detention for the subject property will be provided on the Liberty Grove Contiguous property site that lies on the south side of Southeast 136th Street and east side of 160th Avenue Southeast. The level 3 flow control standard is required as a condition of the drainage adjustment for discharge from the surface water detention facilities. In addition,some downstream surface water conveyance improvements have been made by King County,and others are required to be made by this and other developments that are being proposed and constructed in this area. The downstream analysis and required improvements assure adequate conveyance of surface , water for a distance greater than '/e mile from this plat. The level 3 flow control standard protects downstream properties from damage from surface water discharge from this development. CONCLUSIONS: 1. If approved subject to the conditions recommended below,the proposed subdivision will comply with the goals and objectives of the King County Comprehensive Plan,subdivision and zoning codes, and other official land use controls and policies of King County. 2. If approved subject to the conditions recommended below,this proposed subdivision will make appropriate provision for the public health,safety and general welfare and for open spaces for drainage ways,streets,other public ways,transit stops,potable water supply,sanitary waste, parks and recreation,playgrounds,scbools and school grounds and safe walking conditions for students who only walk to school; and it will serve the public use and interest. 3. 'The conditions for final plat approval recommended below are in the public interest and are reasonable requirements to mitigate the impacts of the development upon the environment. 4. The dedications of land or easements within and adjacent to ihe proposed plat,as required for final plat approval or as shown on the proposed preliminary plat submitted by the Applicant on September 3,2003,are reasonable and necessary as a direct result of the development of this proposed plat,and aze proportionate to the impacts of the development. 5. The Applicant has negotiated for the purchase of development rights that would allow for an increase in the number of lots to be developed on the subject property to a total of 24. The development of 241ots on the subject property will be within the maximum density of 6 dwelling units per acre pemutted in the R4 zone classification in the urban area,although it will be most comparable to the base density of the R6 zone classification. The proposed development of the subject property,utilizing up to 5 density rights,is consistent with all applicable development standards and other provisions of the king county code. Provisions of the City of Renton O TY4 Li Gr v 7 03P0006/L03 03-- o e L berty Comprehensive Plan concerning density of development on this properiy are not applicable to this proposal. 6. The road improvements proposed and agreed to by the Applicant,including those shown on the September 3, 2003 preliminary plat and set forth in the conditions below,will reasonably mitigate the impacts of tra�c generated by the proposed development_ 7. Safe walking conditions for children who walk to school from the subject property will be ' provided by using one of the alternatives for improvements incorporated into this proposal and set forth in condition no.22 below. 8. The conditions of appmval of the surface water drainage adjustment L03 V0065,and the conditions recommended by DDES and agreed to by the Applicant,incorporated into the conditions below,mitigate the impacts of surface water drainage from this proposed development. DECISION: The proposed preliminary plat of Liberty Grove,as revised and received September 3,2003,utilizing up to 5 density credits(transferable density rights), is APPROVED,subject to the following conditions of final plat approvaL• 1. a. Compliance with alI platting provisions of Title 19 of the King County Code. ' b. Prior to the recording of Liberty Grove,the plat of Liberty Grove Contiguous shall be recorded(as drainage facilities for Liberty Grove will be constructed off-site in the plat of I Liberty Grove Contiguous}. �, 2. All persons having an ownership interest in the subject property shall sign on the face of the final ' plat a dedication which includes the language set forth in King County Council Motion No. 5952. 3. a. The plat shall comply with the maacimum density(and minimum density)requirements of the R-4 zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be as shown on the face of the approved preliminary plat,whichever is larger, except that minor revisions to the plat which do not ' result in substantial changes may be approved at the discretion of the Department of Development and Environmental Services. b. The Applicant shall provide Transfer of Density Credit documentation to DDES prior to final approval to allow transfer of a maximum of five density credits. 4. The applicant must obtain final approval from the King County Health Department for abandonment of existing septic systems on-site serving on and off-site homes. 5. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187,as amended (1993 KCRS). � L03P0006/L03TY403—Liberty Grove 8 6. The applicant must obtain the approval of the King County Fire Protection Engineer for the adequacy of the fire hydrant,water main,and fire flow standards of Chapter 17.08 of the King County Code. 7. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location of lots as shown on the preliminary approved pla� Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in KCC 9.04 and the Surface Water Design Manual (SWDM)must also be satisfied during engineering and final review. a. Drainage plans and analysis shall comply with the 1998 King County Surface Water Design Manual and applicable updates adopted by King County. DDES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes,as established by DDES Engineering Review,shall be shown on the engineering pians. c. The following note shall be shown on the final recorded plat: All building downspouts,footing drains, and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings# on file with DDES and/or the King County Department of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems,the systems shall be constructed at the time of the building permit and shall comply with plans on file." d. The storm water control facility shaii be located in a separate tract and dedicated to King County unless portions of the drainage tract are used for required recreation space in accordance with KCC 21A.14.180. 8. A drainage adjustment(L03V0065) is approved for this site and for the Liberty Grove Contigvous site(L03P0005). The adjustment allows combining the storm water from both subdivisions on the Liberty Grove Contiguous site;and routing post developed flows to 160`�Ave SE. A flow splitter is proposed to maintain existing flows to the south. All conditions of approval for this adjustment shall be met prior to engineering plan approval. A Conceptual Drainage Plan showing the preliminary configuration was received March 11,2003. �I 9. The stormwater detention facility shall be designed to the Level 3 flow control standard in the �', 1998 King County Surface Water Design ManuaI(KCSWDM). The facility shall also be �, designed to meet the basic water quality menu. 10. The downstream drainage system along the east side of 160'�Ave SE from the south plat boundary of Liberty Grove Contiguous to approximately 50 feet south of the culvert 29(House# 14028); shall be improved to achieve adequate drainage capacity per the 1998 KCSWDM. Culvert 29 is approximately 900 feet south of the southwest corner of the LCG site and is shown � L03P0006/L03TY403—Liberty Grove 9 in the Level 1 Ot�site Analysis received September 3, 2003. Plans and supporting capacity analysis for this improvement shall be submitted with the engineering plans. 11. � The 100-year floodplain for any on-site wetlands or streams shall be shown on the engineering plans and the final plat per Special Requirement#2 of the KCSWDM. 12. The following road improvements are required to be constructed according to the 1993 King I County Road Standards(KCRS): a. SE 135'"PL shall be improved to the urban subaccess street standard. ' b. FRONTAGE: The frontage along l60`''Ave SE shall be improved to the urban �� neighborhood collector standard(west side only). c. FRONTAGE: The frontage along SE 136�'ST may be improved to the urban standards ', per the SEPA mitigation list_ 'I d. Tract A shall be improved as a private access tract according to Section 2.09 of the I' KCRS. The tract shall be owned and maintained by the owners of those Lots being served. Tracts C and D shall each be improved as a joint use driveway per Section 3.01 of the KCRS. The tracts shall be owned and maintained by the owners of those Lots being served. e. A R/W radius shall be dedicated at the northeast quadrant of 158'�Ave SE and SE 136'� St. (southwest comer of Lot 16),and a second radius shall be dedicated at the northwest quadrant of 160'�Ave SE and SE 136`�St. (southeast corner of Lot 24). f. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. 13. Alt utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. 14. The applicant or subsequent owner shall comply with King County Code 14.75,Mitigation ' Payment System(MPS),by paying the required MPS fee and administration fee as determined by the applicable fee ordinance. The applicant has the option to either: (1)pay the MPS fee at final plat recording,or(2)pay the MPS fee at the time of building pernut issuance. If the first option is chosen,the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System(MPS),have been paid." If the second option is chosen,the fee paid shall be the amount in effect as of the date of building pernut application. 15. The proposed subdivision shall comply with the Sensitive Areas Code as outlined in KCC 21A.24. Preliminary plat review has identified the following specific requirements that apply to this project. All other applicable requirements from KCC 21A.24 shall also be addressed by the applicant: � - , :.G .... . . . . .. :, ._ .. . . . . ' .. �.'. �� :SI... ' r...+.._. �. . . . . , .�. ., . - " a . . ... . a .. ' ��. L03P0006/L03TY403—Liberty Grove 10 Southeast 136�'Street to the south of the project site may or may not be improved prior to beginning construction on Liberty Grove. If road improvements are made or are in the process of being constructed,then no wetland conditions shall apply. If however the improvements are not made or are not under construction, then the extent of the buff'er/wetland area shall be shown on the Plat of Liberty Grove and a Sensitive Areas Tract is required for the protection of the Class II buffer/wetland area for the wetland identified on the Plat of Evendell. 16. The following note shall be shown on the final engineering plan and recorded plat, if wetland buffer is necessary per condition 15 above: RESTRICTIONS FOR SENSITIVE AREA TRACTS AND SENSITIVE AREAS AND BUFFERS Dedication of a sensitive area tracdsensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health,safety and welfare, including control of surface water and erosion,maintenance of slope stability,and protection of plant and animal habitat. The sensitive area tracbsensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tracUsensitive area and buffer the obligation,enforceable on behalf of the public by King County,to leave undisturbed all trees and other vegetation within the tracdsensitive area and buffer. The vegetation within the tracdsensitive area and buffer may not be cut,pruned,covered by fill,removed or damaged without approval in writing from the King County Department of Development and Environmental Services or its successor agency,unless otherwise provided by law. ; The common boundary between the tracVsensitive area and buffer and the area of development ' activity must be marked or otherwise flagged to the satisfaction of King County prior to any clearing,grading,building construction or other development activity on a lot subject to the sensitive area tracdsensitive area and buffer. The required marking or flagging shall remain in , place until all development proposal activities in the vicinity of the sensitive area are completed. I No building foundations are allowed beyond the required 15-foot building setback line,unless otherwise provided by law. 17. Suitable recreation space shall be provided consistent with the requirements KCC 21A.14.180 and KCC 21 A.14.190 in providing sport court[s],children's play equipment,picnic table[s], benches,etc. ' a. A detailed recreation space plan(i.e.,landscape specs,equipment specs,etc.)shall be submitted for review and approval by DDES and King County Parks prior to or , concunent with the submittal of the engineering plans. This plan shall comply with Ordinance# 14045. b. A performance bond for recreation space improvements shall be posted prior to recording � of the plat. 'I � /b I _ _ _ _ _ L03P0006/L03TY403---Liberty Grove 1 I II 18. A homeowners'association or other workable organization shall be established to the satisfaction of DDES which provides for the ownership and continued maintenance of the recreation,open space and/or sensitive area tract(s). 19. Street trees shall be included in the design of all road improvements,and shall comply with I Section 5.03 of the KCRS and KCC 21A.16.050: � a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King County Road Standards,unless King County Department of Transportation determines that trees should not be located in the street right-of-way. c. If King County determines that the required street trees should not be located within the right-of-way,they shall be located no more than 20 feet from the street right-of-way line. d. The trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the County has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. e. The species of trees shall be approved by DDES if located within the right-of-way,and shalI not include poplar,cottonwood,soft maples,gum,any fruit-bearing trees,or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers,or that is not compatible with overhead utility lines. f. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DDES prior to engineering plan approval. g. The street trees must be installed and inspected, or a performance bond posted prior to recording of the pla� If a performance bond is posted,the street trees must be installed and inspected within one yeaz of recording of the plat.At the time of inspection, if the trees are found to be installed per the approved plan,a maintenance bond must be submitted or the performance bond replaced with a maintenance bond,and held for one year. After one year,the maintenance bond may be released after DDES has completed a second inspection and determined that the trees have been kept healthy and thriving. A landscape inspection fee shall also be submitted prior to plat recording.The inspection fee is subject to change based on current County fees. SEPA 20. The following have been established by SEPA as necessary requirements to mitigate the adverse environmental impacts of this deveIopment. The applicants shall demonstrate compliance with these items prior to final approval. // L03P0006/L03TY403—LibeRy Grove 12 Individually,or joint with other area developers,the Applicant shall design and construct improvements to Southeast 128th Street at 160'�Ave. SE to mitigate project impacts at the High Accident Location. Or,the Applicant shall reduce the project impacts at the High Accident Location by completing the remainder of the improvements to Southeast 136th Street(i.e. additional paving,concrete curbs, gutters and sidewalks),between 158th Avenue SE and 160th Avenue SE, and,revise the channelization at the intersection of 156th Avenue SE/SE 136th Street to provide a southbound left turn lane. School Mitigation Fees 21. Lots within this subdivision are subject to King County Code 21A.43,which imposes impact fees to fund school system improvements needed to serve new development. As a condition of final approval, fiRy percent(50%)of the impact fees due for the plat shall be assessed and collected immediately prior to recording,using the fee schedules in effect when the plat receives final approval. The balance of the assessed fee shall be allocated evenly to the dwelling units in the plat and shall be collected prior to building permit issuance. School Walkwavs 22. The Applicant,individually or in conjunciion with other developers,shall construct an off-site walkway to Liberty High school from the site. The walkway shall be constructed within the right-of-way from 160th Ave SE,east along SE 135th Street to 166th Ave SE,and south to Liberty High School at SE 136th Street,or via alternative right-of-way and easements that become available and are approved by DDES. One acceptable alternative would be to use future right-of-way of Southeast 136th Street and 162nd Avenue Southeast to connect with the sidewalk improvement of"five lot subdivision,"and through the plat of"five lot subdivision"/LOOP0023 to the southwest gate of Liberty High School. The walkway shall be designed and constructed in accordance with the 1993 King County Road Standards and shown on the engineering plans for DDES review and approval. Any surfacing alternative from the King County Road Standards(KCRS 3.09)may be submitted for approval through a road variance application. ORDERED this 23rd day of February,2004. , J es . O'Connor ing ounty Hearing Examiner pro tem TRANSMITTED this 23rd day of February, 200 ,to the parties and interested persons of record: William J.Bowen Wilma J.Bowen Marshall Brenden Bowen Revocable Living Tnut 13644-160th Ave.SE 18225 SE 128th 13644-160th Ave.SE Renton WA 98059 Renton WA 98059 Renton WA 98055 /Z L03P0006/L03T1'403—Liberty Grove 13 Carolyn Ann Buckeri Thomas Cariyle Melvi�L.Daley 16524 SE 145th St. PO Box 581 DMP,INC Renton WA 98059 Tacoma WA 98401 726 Aubum Way N Aubum WA 98002 Kathy Graves Brad 8�Ju6e Herrin Gwendolyn High 13020-160th Ave.SE 16202 SE 137th PI. P.O.Box 2936 Renton WA 98059 Renton WA 98059 Renton WA 98056 Victor 8 Gwendolyn High Wayne Jones Edward June 8 Kris Nill ' 13405-158th Ave.SE Lakeridge Devebpment Inc. 13527 156th Ave.SE Renton WA 98059 PO Box 146 Renton WA 98059 I Rentan WA 98057 I I �on 8 Diane Kezele Milton b Helen Lee Rebecca Lind 15657 SE 137th PI. P.O.Bou 2574 City of Renton,EDNSP Renton WA 98059 Renton WA 98056 1Q55 S.Grady Way Renton WA 98056 Leroy Nass Kathy Nelson Richard 8�Anita Oliphant i5713 SE 128th St. Transportation Dept 16519 SE 145th SL Renton WA 98059 805-2nd Ave.S. Renton WA 98059 ' Issaquah WA 98027 Larry 8�Susan Oord David&Georgia Platt Guy Platz 16013 SE 136th St. 510 Panoramic Dr. 13535-160th Ave.SE Renton WA 98059 Camano Island WA 98282 Renton WA 98059 Resident Mike Romano Seattle KC Health Dept. 13020-160th Ave.SE Centurion Devebpment Services E.Dist.Environ.Health Renton WA 98059 22617 8th Drive SE 14350 SE Easigate Way Bothell WA 98021 Bellevue WA 98007 Deborah Stewart Jesse Tnatcher Mike Tull 16207 SE 136th St. 13817-162nd Ave.SE 16056 SE 136th St. Renton WA 98059 Renton WA 98059 Renton WA 98059 Mr.&Mrs. Bob Wilmot Kevin M.Wyman Gregg Zimmerman 13900-160th Ave.SE 16540 SE 149th SL City of Renton-Planning Renton WA 98059 Renton WA 98059 1055 S Grady Way Renton WA 98055 Greg Borba Kim Claussen Nick Gillen DDES/IUSD DDESlLUSD DDES/LUSO MS OAK-DE-0100 Current Planning Site Development Services MS OAK-0E-0100 MS OAK-DE-0100 Kristen Langley Carol Rogers Karen Scharer DDES/LUSD DDESlLUSD DDES/LUSD Land Use Traffic MS OAK-0E-0100 Current Planning MS OAK-DE-0100 MS OAK-DE-0100 Steve Townsend Larry West Bruce Whittaker DDESlLUSD DDESlLUSD DDES/LUSD Land Use InspecGons Geo Review Prel.Review Engineer MS OAK-DE-0100 MS OAK-0E-0100 MS OAK-DE-0100 � L03P0006/L03TY403—Liberty Grove 14 NOTICE OF RIGHT TO APPEAL In order to appeal the decision of the Examiner, written notice of appeal must be filed with the Clerk of the King County Council with a fee of$250.00 (check payable to King County Office of Finance) on or before March 8, 2004. If a notice of appeai is filed, the original and six (6) copies of a written appeal statement specifying the basis for the appeal and argument in support of the appeal must be filed with the Clerk of the King County Council on or bejore March IS, 2004. Appeal statements may refer only to facts contained in the hearing record;new facts may not be presented on appeal. Filing requires actual delivery to the Office of the Clerk of the Council, Room 1025, King County Courthouse, S16 3`�Avenue, Seattle, Washington 98104,prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if actual receipt by the Clerk does not occur within the applicable time period. The Examiner does not have authority to extend the time period unless the Office of the Clerk is not open on the specified closing date, in which event delivery prior to the close of business on the next business day is sufficient to meet the filing requirement. If a written notice of appeal and filing fee are not filed within fourteen (14) calendar days of the date of this report, or if a written appeal statement and azgument aze not filed within twenty-one (21) calendar days of the date of this report, the decision of the hearing examiner contained herein shall be the final decision of King County without the need for further action by the Council. MINUTES OF THE FEBRUARY 10,2004,PUBLIC HEARING ON DEPARTMENT OF ' DEVELOPMENT AND ENVIRONMENTAL SERVICES FILE NOS. L03P0005/LIBERTY GROVE CONTIGUOUS (LGC)AND L03P0006/L03TY403/LIBERTY GROVE (LG). � James N. O'Connor was the Hearing Examiner in this matter. Participating in the hearing were Karen Scharer,Bruce Whittaker,Nick Gillen and Kristen Langley,representing the Department;Wayne Jones and Dave Casey,representing the Appellant;Gwendolyn High,Intervenor for C.A.R.E.and Anita Oliphant,Kristy Hill,Mary Brotherton,Diane Kezele,Rhonda Bryant,and Joann Lee. The following exhibits were offered and entered into the record: Exhibit No. 1 LGC—DDES File L03P0005 Exhibit No. 2 LG—DDES File L03P0006 \ Exhibit No. 3 LGC—DDES Preliminary Report for L03P0005,Prepared January 26,2004 with attachments as follows: 3.1 36 Lot Plat Design 3.2 Density Calculations R-4 w/4 TDRs 33 Issaquah School District 3.4 Certificate of Water Availability dated January 8,2003 3.5 City of Renton Letters,including the Sewer Certificate 3.6 Certificate of Transportation Concurrency Exhibit No.4 LG—DDES Preliminary Report for L03P0006,Prepared Ianuary 26, 2004 with attachments as follows: 4.1 24 Lot Plat Design 4.2 Density Calculations R-4 w/5 TDRs � L03P0006/L03TY403-Liberty Grove 15 4_3 Issaquah School District � 4.4 Certificate of Water Availability dated January 8,2003 � 4.5 City of Renton Letters, including Sewer Certificate 4.6 Certificate of Transportation Concurrency Exhibit No. 5 CorrectionsJRevisions of Conditions to DDES Preliminary Reports (Conditions 7.d. & 12.d)dated February 9,2004-Not Entered into the Record Exhibit No. 6 LGC-Application for Land Use Permit/Plat L03P0005 Received March 11,2003 Exhibit No. 7 LG-Application for Land Use Permit/Plt L03P0006 received March 11,2003 Exhibit No. 8 LGC-Revised Environmental Checklist Received September 3,2003 Exhibit No. 9 LG-Revised Environmental Checklist Received September 3,2003 Exhibit No. 10 LGC-Mitigated Determination of Non-Significance dated December 16,2003 Exhibit No_ 11 LG-Mitigated Determination of Non-Significance dated December 16, 2003 Exhibit No. l 2 LGC-A�davit of Revised Posting Indicating Posting Date of June 2,2003 And received June 3, 2003 Exhibit No. 13 LG-Affidavit of Posting Indicating Posting Date of June 2, 2003 and received June 3,2003 Exhibit No. 14 LGC-Revised Site Plan(36 Lot Preliminary Plat Map)received September 3,2003 Exhibit No. I S LG-Revised Site Plan(24 Lot Preliminary Plat Map)received September 3,2003 Exhibit No. 16 Assessors Maps(2)SE 14-23-OS Revised February 3,2000&NE 14-23-OS Revised February 28, 2000 Exhibit No. l7 Letter w/attachments to DDES from Wayne Jones;Re: Intent to sell TDR-Density Credits dated Apri123,2003 Exhibit No. 18 Traffic Impact Analysis prepared by Gary A.Norris of DN Tra�c Consultants dated February 7,2003 and received March 11,2003 Exhibit No. 19 Revised Traffic Impact Analysis prepared by Gary A.Norris of DN Traffic Consultants dated June 24,2003 and received September 3,2003 Exhibit No. 20 Walkway Study Prepared by DMP,Inc. dated August 1 S,2003 Exhibit No. 21 LGC-Walkway Study Map Annotated by DDES prepared February 9,2004 Exhibit No. 22 March 10,2003 email from Issaquah School District to Ted Cooper regarding School walkways to Liberty High,Maywood Middle and Briarwood Elementary School for plat conditions of LOOP0023 Exhibit No.23 Level One Off-Site Analysis prepared by Daley-Motrow-Poblete,Inc. dated March 3, 2003 Exhibit No. 24 Revised Level One Off-Site Analysis prepared by Daley-Morrow-Poblete,Inc. � Dated July 11,2003 � Exhibit No. 25 Conceptual Drainage Plan received March 11,2003 Exhibit No. 26 Additional Downstream Information received November 25,2003 Exhibit No. 27 LG-Letter to Wayne Jones and Mel Daley from James Sanders and)im Chan Dated December 4,2003 regarding drainage adjustment(L03V0065) Exhibit No.28 Wetland Evaluation and Delineation Report and Wildlife Habitat Evaluation By Habitat Technologies dated November 5,2002 Exhibit No.29 LGC-Letter to Wayne Jones from Mark Heckert of H&S Consulting dated July 18, 2003;Addendum to the Wetland Evaluation and Delineation Report Exhibit No.30 LGC-Tnbutary Area Map Annotations by DDES;Prepared February 2004 Exhibit No. 31 Letter to Karen Scharer from Anita&Richard Oliphant dated January 29,2004 Requesting comments to LO1P0016&L03RE038 be considered in this matter Exhibit No. 32 Letter to Karen Scharer from Steven&Joann Lee dated February 2,2004 Regarding claim of adverse possession along south property line of LGC /5 L03P0006/L03TY403—Liberty Grove 16 Exhibit No. 33 Hearing Examiner Report&Decision for EvendelULO1P0016/L03RE038 Issued February 4,2004 Exhibit No. 34 Email from Shirley Day to Karen Scharer dated February 3, 2004 Exhibit No. 35 Email from Glenda Johnson to Karen Scharer dated February 10,2004 Exhibit No. 36 Letter from Bill &Dona Mokin to Karen Scharer dated February 7,2004 Exhibit No. 37 Photograph of driveway located at SE 136�'/160`�on February 4,2004 Exhibit No. 38 C.A.R.E. Response: Liberty Grove/I.iberty Grove Contiguous Plat Applications L03P0006&L03P0005 Exhibit No. 39 C_A.R_E. Households List Exhibit No. 40 Community Map Exhibit No.41 March and Apri1200G Press Releases from King County Executive Ron Sims Exhibit No. 42 King County Metro Six Year Transit Development Plan,February 2002 Exhibit No. 43 Report of the King County General Government Budget Advisory Task Force To County Executive Ron Sims dated June 25, 2003 Exhibit No. 44 A Joint City Position-The Cities' Suggestions for Inclusion in the King County Budget Advisory Task Force's Recommendations dated March 12, 2003 Exhibit No.45 Message to Employees from King County Executive Ron Sims; General Budget Advisory Task Force Recommendations dated July 9,2003 Exhibit No. 46 King County Council Budget&Fiscal Management Committee Capital Budget Plan, 2004 CIP Overview Exhibit No.47 In Transportation-Facing the Budget's Challenges from Harold Taniguchi Dated November 3,2003 Exhibit No. 48 High Accident Locations Report dated July 2003 Exhibit No. 49 Transportation Service Areas 2000 Exhibit No. 50 Kin Coun Con�urren� IlQ1,2D02and 2043 - ---- --- __ _------�---- tY - �MaFs2 Exhibit No. 51 Transportation Concurrency Detail Comparison Graphic Exhibit No. 52 City of Renton Long Range Wastewater Management Plan(Excerpts) Exhibit No. 53 2003 King County Annual Growth Report Exhibit I�'�. 54 King County B�nchmark Iteport-2003 (Land use-excerpts) Exhibit No. 55 Buildable Lands Report-Dated August 29,2002(Excerpts) ' E�chibit No. 56 State,County,City Populations E�chibit No. 57 City of Renton Economic Development,Neighborhoods,and Strategic Planning Department Reports(June 3,2003;Sentember 23,2003; October 1, 2003; October 10,2003) Exhibit No. 58 Renton Planning Commission Recommendation dated October 22,2003 - Exhibit No. 59 City of Renton Ordinance No. 5026 Exhibit No. 60 Renton City Council Meeting Minutes dated November 24,2003 Exhibit No. 61 C.A.RE. Member's Letters Detailing Adverse Impacts from High Density Development in this Community Exhibit No. 62 City of Renton Proposed Comprehensive Plan Land Use Map Exhibit No. 63 Two Photographs of Intersection Exhibit No. 64 Two Photographs of SE 144�'/62"d Ave. SE Exhibit No. 65 List of Individuals and Their Addresses in Attendance Exhibit No. 66 Letter to Karen Scharer from Ciaude R. &Eloise M.Stachowiak Dated November 16,2003 /6 L03P0006/L03TY403—Liberty Grove 17 Exhibit No. 67 Letter to the Hearing Examiner from Kristy J. Hill dated February 10,2004 Exhibit No. 68 Letter to the Hearing Examiner from Edward &June Hill dated February 10,2004 JOC:gao L03P0006/L03TY403 RPT O �, I February 27, 2004 OFFICE OF THE HEARING EXAMINER KING COUNTY,WASHINGTON 400 Yesler Way,Room 404 Seattle,Washington 98104 Telephone(206)296-4660 Facsimile (206) 296-1654 REPORT AND DECISION SUBJECT: Departrnent of Development and Environmental Services File Nos_ L03P0005/L03TY401 Proposed Ordinance Nos.2004-0003;2004-00�5 LIBERTY GROVE CONTIGUOUS Proposed Preliminary Plat and Proposal for Transfer of Density Credits Location: South of Southeast 136�' Street,between 160`�Avenue Southeast and i 52nd Aven�e Southeasi Applicant: Lakeridge Development Attn: Wayne Jones P.O. Box 146 Renton,Washington 98057 Telephone: (425) 228-9750 Intervenor: C.A.R.E.,represenled by Gwendolyn High 13405—158`�Avenue Southeast Renton,Washington 98059 King County: Depariment of Development and Environmental Services,represented by Karen Scharer 900 Oakesdale Avenue Southwest i Renton,Washington 98055-1219 Telephone: (206)296-7114 Facsimile: (20�296-6613 SUMMARY OF DECISION/RECOMMENDATION: Department's Preliminary Recommendarion: Approve,subject to conditions Department's Final Recommendation: Approve,subject to conditions(modified) Examiner's Decision_ Approve,subject to conditions(mod�ed) /8 L03P0005/L03TY401—Lberty Grove Contiguous 2 EXAMINER PROCEEDINGS: Hearing opened: February 10,2004 Hearing closed: February 10,2004 Participants at the public hearing and the e�chibits offered and entered are listed in the attached minutes. A verbatim recording of the hearing is available in the office of the King County Hearing Examiner. ISSUES/TOPICS ADDRESSED • Transfer of density credits • Surface water drainage • Road improvements • Safe walking conditions SUMMARY Application for transfer of a maximum of 5 density credits,and approval of a preliminary ptat to subdivide approximately 7.92 acres into 361ots in the urban area,are granted preliminary approval. FINDINGS, CONCLUSIONS&DECISION:Having reviewed the record in this matter,the Examiner now makes and enters the following: FINDINGS: 1. GeneralInformation: Proponent: Wayne Jones,Jr. Lakeridge Development Inc. PO Box 146 Renton,WA 9805? Phone:425-228-9750 e-mail:joneswayne@qwest.net Representative: Mel L.Daley,P.E. Daley-Morrow-Poblete,Inc. Auburn Way North Phone: 253-333-220(} Facsimile: 253-333-2206 Intervenor: C.A.RE.,represented by Gwendolyn High I 13405—158'�Avenue Southeast ' Renton,Washington 98059 Location: Lying south of SE 136'"St. between 160`�Ave. SE and 162�'Ave. SE. SectionrI'ownship/Range: SE 14-23-05 Parcels 1457500085 &90 Acreage: 7.92 acres ' /q L03P0005/L031'Y401—L�berty Grove Contig�ous 3 Current Zoning: R-4 Number of Lots: Proposed-36 w/4 or 5 TDRs Density: 4.7 dwellings per acre Lot Size: 4,400 to 8,700 square feet Proposed Use: single family Sewage Disposal: City of Renton Water Supply: Water District#90 Fire District: King County Fire District#25 School District: Issaquah Community Plan: Newcastle Drainage Subbasin: Lower Cedar River ' King County Pernvts: Subdivision Complete Application Date: Apri18,2003 (Dated Filed March 11,2003) Threshold Determination: Mitigated Determination ofNonsignificance(MDNS) Date of Issuance: December 16,2003 KC Permit Contact: Karen Scharer,Project Manager II,C�urent Planning Section,LUSD Phone#296-7114 or e-mail at karen.schazer@metrokc.gov 2. Except as modified herein,the facts set forth in the DDES preliminary report to the Hearing Examiner for the February 10,2004,public hearing are found to be corcect and are incorporated herein by this reference. Said report is eachibit no.3 in the hearing record. 3. The Applicant's request to reclassify the subject properly from R4 to R6 was withdrawn prior to commencement of the hearing. 4. On February 4,2004 the King County Hearing Examiner issued his report and decision granting preliminary approval for the revised plat of Evendell,based upon transfer of 20 density credits that would allow for development of 701ots on 12.43 acres. This would provide a density of 5.6 dwelling units per acre on the Evendell pmperty,which is directly west,across 160�'Avenue Southeast, from the subject property. The maacimum density permitted in the R4 zone classification is 6 dwelling units per acre,utilizing density incentives or transferred development rights. The Examiner's decision approving the Evendell plat revision,File No. LO1P0016, is exhibit no.33 in the hearing record of this proceeding. 5. Direcdy north of the subject property are single-family dwellings on lots that are approximately 9,600-10,000 square feet in area. East,across 162°d Avenue Southeast,is the plat of Liberty Lane,with lots appro�mately 12,500 square feet in size. South of the subject property is a 2.24 acre parcel. 6. King County's"Transfer of Development Rights(TDR)"program is governed by Chapter 21 A37 of the King County Code. The TDR program establishes a property right which is separable from the fee-simple title to certain lands within King County,and provides a method for the transfer and utilizafion of that new right,which is colloquially known as a development right or"density credit" A density credit has a substantial market value. "The underlying pwpose of the TDR program is to allow for the movement of residential density from rural areas to urban areas of King County. The code is intended to provide,"...an efficient � L03P0005/L.03TY401—Libercy Grove Contiguous 4 and streamlined administrative review system to ensure that transfers of development rights to receiving sites are evaluated in a timely way and balanced with other County goals and policies, and are adjusted to the specific conditions of each receiving site." KCC 21 A37.0102. Receiving sites are required to meet the provisions of KCC 21A37.030. Those requuements are that the receiving site: 1. be within an unincorporated wban area,zoned R-4 or higher,or be within a potential annexation area; 2. be within a city where new growth is or will be encouraged,and where facilities and services exist or public inveshnents in facilities and services will be made;or 3. be within RA-2.5 and RA-5 zoned pazcets, subject to stringent criteria. The subject property is within the first category of eligible receiving sites listed in KCC 21A.37.030. Sites within the unincorporated urban growth area aze not required to have any specific level of available faciliries and services. Development approvals that utilize density credits must meet only those service criteria that apply generally to development of the number of dwelling units proposed on the site. King County Code chapter 21A.12 governs densities and development standards in residential Izones. The R-4 zone in the urban residential area allows for a maximum density of six dwelling I units per acre,which may be achieved only through the application of residenrial density incentives or transfers of development rights. KCC 21 A.12.030.A. and B.1. When density credits are used, development shall comply with dimensional standards of the zone having a base density most comparable to the tatal approved density. KCC 21A37.030.B. 7. The foregoing provisions of ihe King County Zoning Code are generally consistent with policies of the King County Comprehensive Ptan goveming residential land use. In particular, the Zoning Code provisions are generally consistent with: Policy U-113,that new residential development in the Urban Growth Area should occur where facilities and services can be provided at the lowest public cost and in a timely fashion; Policy U-114,that the County seek to achieve an average zoning density of at least seven to eight homes per acre in the Urban Growth Area through a mix of densities,allowing for lower density zones to recognize existing subdivisions with little or no opportunity for infill or redevelopment; Policy U-122,that supports increases in urban density through a rezone or a proposal to utilize density transfer,when the proposal will help resolve traffic,utility,parks or open space deficiencies in the unmediate neighborhood. This proposal will extend sewer service further into the urban area, and will provide recreation facilities and open space , available to future residents on the subject property. �i 8. The subject property is in the City of Renton's potential annexation area. The City is considering � modifications to its comprehensive plan that would limit density on property in this area to a maximum of 4 dwelling units per acre. However,those plan changes were not in effect at the 0 L03P0005/L03TY401—Liberty Grove Contiguous 5 time a complete application for this subdivision was submitted, and the property is not presently within the City of Renton's jurisdiction. 9. DDES,this Applicant and the developers of other properties in the vicinity have agreed upon right-of-way dedications and road improvements to mitigate the impact of tr�c which this proposai will generate adjacent to and in the immediate vicinity of the proposed development. The dedications and improvements to be provided by this proposal will include the east side of 160`�Avenue Southeast and the south side of Southeast 136�'Street,along the plat frontage and north and west to the intersection of Southeast 136`�Street with 160`�Avenue Southeast. Improvemen#s that will be made to Southeast 136�'Street, from 156`�Avenue Southeast to 160� Avenue Southeast,will result in a new east-west route that will divert tr�c from the high accident intersection of Southeast 128"'Street and 160�'Avenue Southeast. 1'hose Southeast 136�'Street improvements may be made by other developers prior to tt�e deveiopment of Liberty , Grove,or may be made jointly by this plat in cooperation with other developers. 10. The Issaquah School District plans to operate a school bus stop for elementary schooi children at i the intersection of Southeast l 36th Street and 160th Avenue Southeast_ The internal road improvements and frontage improvements on 160th Avenue Southeast and Southeast 136'�Street !, will provide a safe mute for children to use between the lots of this subdivision and that bus stop. Additionally,the Applicant wiIl provide school walkway improvements pursuant to the requirements of condition no. 22 below,to provide safe walking conditions to the high school and middle school serving the area. 11. A surface water drainage adjustment(no.L03VOU65)has been approved for this proposal and the Liberty Grove proposal(no:L03P0006). Stormwater detention will be pmvided on this property for the Liberty Grove property that lies on the north side of Southeast 136th Street and west side of 160th Avenue Southeast. The level3 flow control standard is required as a condition of the . drainage adjustment for discharge from the surface water detention facilities. In addition,some downstream surface water conveyance improvements have been made by King County,and others are required to be made by this and other developments that aze being proposed and constructed in tlus area. "The downstream analysis and required improvements assure adequate conveyance of surface water for a distance greater than %.mile from this plat. The level 3 flow control standard protects downstream properties fi-om damage from sudace water discharge from this development. 12. Improvements to Southeast 136�'Street along the frontage ofparcels 0086-0488 will be consh-ained by the steepness of existing driveways on those three lots,particularly parcel 0086 at the inte�ection of 160�'Avenue Southeast and Southeast 13b�'Street. It may be necessary to substitute a walkway for the curb,gutter and sidewalk required by the King County Road Standards through a portion of this area. If a variance is necessary, it can be addressed at the time engineering plans are submitted for review and approval. 13. The Applicant has agreed to provide sewer connections to serve the three properties fronting Southeast 136`�Street that have drainfield easements on the subject pmperty_ The tenns of the existing drainfield easements provide for their abandonment at such time as sewers are available and connecrions provided. Approval by the King County Health Department of the abandorunent ZZ L03P0005/L03TY401—Liberty Grove Contig�wu 6 of e�cisting sepric systems on site,including drainfields that serve off-site homes,is required prior to final plat approval. 14. The proposed sensitive areas tract,"Tract F",provides appropriate protection for the on-site wetland in the south central portion of the property. CONCLUSIONS: 1. If approved subject to the conditions recommended below,the proposed subdivision will comply with the goals and objectives of the King County Comprehensive PIan,subdivision and zoning codes,and other official land use controls and policies of King County. 2. If approved subject to the conditions recommended below,this proposed subdivision will rnake appropriate provision for the pubtic heaith,safety and general welfare and for open spaces for drainage ways,streets, other public ways,transit stops,potable water sapply,sanitary waste, parks and recreation,playgrounds,schools and school grounds and safe wallcing conditions for students who only walk to school;and it will serve the public use and interest 3_ The conditions for final plat approval required below are in the public interest and are reasonable , requuements to mitigate the impacts of the development upon the environment. �I 4. The dedications of land or easements within and adjacent to the proposed plat, as required for I final plat approval or as shown on the proposed preliminary plat submitted by the Applicant on September 3,2003,are reasonable and necessary as a direct result of the development of this I proposed plat,and are proportionate to the impacts of the development 5. The Applicant has negotiated for the purchase of development rights that would allow for an , increase in the number of lots to be developed on the subject property to a total of 36_ The development of 361ots on the subject properiy will be within the ma�cimum density of 6 dwelling � units per acre permitted in the R4 zone classi5cation in the urban are� The proposed � ' development of the subject property,utilizing up to 5 density rights,is consistent with all � applicable development standards and other provisions of the king county code. Provisions of the i City of Renton Comprehensive Plan concem�ng density of devetopment on this property are not � applicable to this proposal. i 6. The road impmvements proposed and agreed to by the Appticant,including those shown on the September 3,2003 preliminary plat and set forth in the conditions below,will reasonably mitigate the impacts of traffic generated by the proposed development. 7. Safe walking conditions for children who walk to school from the subject property will be provided by using one of the alternatives for improvements incorporated 'mto this proposal and set forth in condition no.22 below. 8. The conditions of approval of the surface water drainage adjustment L03V0065, and the conditions recommended by DDES and agreed to by the Applicant, incoiporated into the conditions below,mitigate the impacts of surface water drainage from this proposed development 0 L03P0005/L03TY401—Liberty Grove Contiguous 7 9. The establishment of"Tract F"as a sensitive areas tract,and the conditions recommended by DDES and agreed to by the applicant,incorporated into the conditions below,preserve and protect the on-site Class 3 wetland in accordance with the requirements of the King County Sensitive Areas Code. DECISION: The proposed prel'uninary plat of Liberty Grove Contiguous,as revised and received September 3,2003, utilizing up to 5 density credits (transferable density rights),is APPROVED, subject to the following conditions of final plat approval: 1. Compliance with all platting provisions of Title 19 of the King County Code. 2. All persons having an ownership interest in the subject property shall sign on the face of the final plat a dedication which includes the Ianguage set forth in King County Council Motion No_ 5952_ 3_ a. The plat shall comply with the maximum density(and minimum density)requirements of the R-4 zone classification. All lots shall meet the minimum dimensional requirements of the R-4 zone classification or shall be as shown on the face of the approved preliminary plat,whichever is larger, except that minor revisions to the plat which do not result in substanrial changes may be approved at the discretion of the Department of Development and Environmental Services. b. The Applicant shall provide Transfer of Density Credit documentation to DDES prior to final approval to allow transfer of a maximum of five density credits. c. Fence encroachment shall be resolved to the satisfaction of King County DDES LUSD or the encroachment area shall be conveyed to the adjoining property prior to the recording of the final plat. The Applicant shall document the impact on lot density by the exclusion of any encroachment area. 4. The applicant must obtain final approval from the King County Health Department for abandonment of existing septic systems on-site,inctuding drainfields that serve off-site homes. 5. All construcLion and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187,as amended (1993 KCRS),except as modified by variance. 6. The applicant must obtain the approval of the King County Fire Protection Engineer for the adequacy of the fire hydrant,water main,and fire flow standards of Chapter 17.08 of the King County Code. 7. Finai plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or modifying the location of lots as shown on the preliminary approved plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements_ All other applicable requirements in KCC 9.04 and the Surface Water Design Manual(SWDI1�must also be satisfied during engineering and final review. � IA3P0005/L03TY401—Liberty Grove Contiguous 8 a. Drainage plans and analysis shall comply with the 1998 King County Surface Water Design Manual and applicable updates adopted by King County. DDES approvai of the drainage and roadway plans is required prior to any construction. b. C�rrent standard plan notes and ESC notes,as established by DDES Engineering Review,shall be shown on the engineering pians. c. The following note shall be shown on the fmal recorded plat: All building downspouts,footing drains,and drains from all impervious surfaces such as ' patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved consh-uction drawings# on file with DDES and/or the King County Department of Transportation. This pIan shall be submitted with the application ', of any building pernu� Ali connections of the drains must be constructed and approved ' prior to the final building inspection approval. For those lots that are designated for individual lot infi3tration systems,the systems shall be constructed at the time of the building permit and shall comply with plans on file." d. The storm water control facility shall be located in a separate tract and dedicated to King County unless portions of the drainage tract are used for required recreation space in � accordance with KCC 21A14180. ; 8. A drainage adjustrnent(L03V0065)is approved for this site and for the Liberty Grove site (L03POOOb). The adjustment allows combining the storm water from both subdivisions on the Liberty Grove Contiguous site;and routing post developed flows to 160�'Ave SE. A flow splitter is proposed to maintain existing flows to the south. All conditions of approvai for this adjustment shall be met prior to engineering plan approval. A Conceptuai Drainage Plan showing the pretiminary configuration was received March 11,2003. 9. The stormwater detenrion facility shail be designed to the Leve13 flow control standard in the 1998 King County Surface Water Design Manuai(KCSWDM). The facility shall also be designed to meet the basic water quaIity menu. 10. 'The downstream drainage system along the east side of 160`�Ave SE from the south plat boundary to approximately 50 feet south of the culvert 29(House# 14028);shail be impmved to achieve adequate drainage capacity per the 1998 KCSWDM. Culvert 29 is shown in the Level 1 Offsite Analysis received September 3,2003. Plans and snpporting capacity analysis for this improvement shall be submitted with the engineering plans. 11. The 100-year flaodplain for any on-site wetlands or streams shall be shown on the engineering plans and tbe final ptat per Special Requirement#2 of the KCSWDM. 12. The following road improveinents are required to be constructed according to the 1993 King County Road Standards(KCRS): a. SE 137`�Street(the intemal access street)shall be improved to the urban subaccess street standard. Z5 L03P0005/L037Y401—Liberty Grove Contiguous 9 b. 162"d Place Southeast shall be improved to the urban subaccess street standard from SE 137`�St to SE 136`�St; and improved to the nunor access street standard south of SE 137`�St. c. 160`h Ave SE from the south plat boundary to SE 136'�St shall be improved to the urban neighborhood collector standard(east side only). d. SE 136`�St from l60`�Ave. SE to 162"d Ave. SE shall be improved to the urban neighborhood collector standard(south side only}; except for the fust 270 feet east of 16��'Ave. SE. The first 270 feet can transition to a narrower width to avoid creating an adverse grade to the existing three driveways. Reverse slope driveways or other designs may be considered by DDES at engineering plan review stage. e. Tracts D and E shall each be improved as a joint use driveway per Section 3.01 of the KCRS. The tracts shall be owned and maintained by the owners of those lots being served. f. A R/W radius shall be dedicated at the southwest quadrant of 162"d Ave.SE and SE 136te St. (northeast comer of Lot 9)_ g. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. l 3. Ail utilities within proposed rights-of-way must be inclnded within a franchise approved by Ehe King County Council prior to final plat recording. 14. The applicant or subsequent owner shall comply with King County Code 14.75,Mitigation Payment System(MPS),by paying the required MPS fee and administration fee as detemuned by ' the applicable fee ordinance. The applicant has the option to either: (1)pay the MI'S fee at fmal ' plat recording,or(2)pay the MPS fee at the time of building permit issuance. If the first oprion ' is chosen,the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System(MPS),have been paid" If the second option is chosen,the fee paid shall be Lhe amount in effect as of the date of building pemut application. 15. The proposed subdivision shall comply with the Sensirive Areas Code as outlined in KCC 21 A.24. Preliminary plat review has idendfied the following specific requirements that apply to ' tlus project All other applicable requirements from KCC 21A.24 shall also be addressed by the � applicant li a. The Class 3 wetland shall have a minimum 25-foot bu�er of undisturbed vegetation as �I , measured from the wetland edge. b. Buffer width averaging rnay be allowed by King County if it will provide additiona] protection to the wetland or enhance there fimctions,as long as the total area contained in the buffer on the development proposal site does not decrease. In no area shall the buffer I be less than 65 percent of the required minimum distance. To ensure such functions aze 26 L03P0005/IA3TY401—Liberty Grove Contiguous 10 enhanced a mirigation plan will be required for the remaining on-site sensitive areas. An enhancement plan shall be submitted for review during final engineering review. c. Sensitive area Tract(s)shall be used to delineate and protect sensirive areas and buf�'ers in development proposals for subdivisions and shall be recorded on all documents of title of record for all afTected lots. d. A 15-foot BSBL shall be established from the edge of buffer and/or the sensitive areas Tract(s)and shown on all affected lots. e. A mitigation plan and financial guarantee/bond will be required for any proposed impacts of sensitive azeas. The bond amount will include all components of the mirigation plan including,but not limited to,plantings,grading, fencing,signs, inspections,and monitoring for five years. � � f. Prior to commencing construction activities on ihe site,the appiicant shall temporarily �I mark sensitive areas Tract(s)in a highly visible manner,and these azeas must remain so I marked until all development proposal activities in the vicinity of the sensitive azeas are completed. g. Prior to final approval of constn�ction activities on the site,tl�e boundary between the sensitive area Tract(s)and adjacent land shall be identified using permanent signs. Sign spec�cations shall be shown an fmal engineering plans and shall be installed every 50 feet or as deemed appropriate by county staff at the time of engineering review. h. During engineering plat review the applicant shall provide a wetland hydrology analysis to demonstrate how the wetland hydrology will be maintained post-construction. i. Detention out-fall structures maybe permitted within the wetland buffers,however, structures shall be located in the outer edge of the buffer,if possible. All buffer impacts shall be mitigated. j. Development authorized by this approval may require other state and/or federal pemvts or approvals. It is the applicant's responsibility to correspond with these agencies prior to beginning work on the site. k. During engineering review,the plan set shall be routed to the sensitive azeas group to determine if the above conditions have been met. 16. The following note shall be shown on the final engineering plan and recorded plat: RESTRICTIONS FOR SENSITIVE AREA TRACTS AND SENSITNE AREAS AND BUFFERS Dedication of a sensirive area tract/sensirive area and buf�'er conveys to the public a beneficial interest in the land within the ti-acdsensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health,safety and welfare, including control of surface water and erosion,maintenance of slope stabiIity, and O L03P0005/L03TY401—Liberty Grove Contiguous ll protection of plant and animal habitat. The sensitive area tracdsensitive area and buffer imposes ' upon all present and future owners and occupiers of the land subject to the tracdsensitive area and buffer the obligation,enforceable on behalf of the public by King County,to leave undisturbed , all trees and other vegetation within the tract/sensitive area and buffer. The vegetation within the tracdsensitive area and buffer may not be cut,pruned,covered by fill,removed or damaged with�ut approval in writing from the King County Department of Development and Environmental Services or its successor agency,unless otherwise provided by law. The common boundary between the tracdsensitive area and buffer and the area of development activiry must be marked or otherwise flagged to the satisfaction of King County prior to any clearing, grading,buiiding construction or other development activity on a lot sub}ect to the sensitive area tracdsensitive area and buffer. The required marking or flagging shall remain in place until all development proposal activities in the vicinity of the sensitive area are completed. No building foundations are allowed beyond the required 15-foot bnilding setback line,unless otherwise provided by law. I7. Suitable recreation space shall be provided consistent with the requirements KCC 21A.14.180 and KCC 21A.14.190 including sport court[s],children's play equipment,picnic tablejs], benches, etc. a. A detailed recreation space pIan(i.e.,landscape specs,equipment specs,etc.)shall be submitted for review and approval by DDES and King County Parks prior to or concurrent with the submittal of the engineering plans. This plan shall comply with Ordinance# 14(345. b. A performance bond for recreation space improvements shall be posted prior to recording of the plat. 18. A homeowners' association or other workable organization shail be established to tt�e satisfaction of DDES which provides for the ownerslup and continued maintenance of the recreation,open space and/or sensitive area tract(s). 19. Street trees shall be included in the design of all road improvements,and shall compty with Section SA3 of the KCRS and KCC 21A.16.050: a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King County Road Standards,unless King County Department of Transportation detennines that trees should not be located in the street right-of-way. c. If King County determines that the required street trees should not be located within the right-of-way,they shall be located no more than 20 feet from the street right-of-way line. Zg L03P0005/L03TY401—Liberty Gmve Contiguous 12 d. The trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the County has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the fmal recorded plat. e. The species of trees shall be approved by DDES if located within the right-of-way, and shall not include poplar,cottonwood,soft maples,gum,any fruit-bearing trees,or any other tree or shrub whose roots are likeiy to obstruct sanitary or storm sewers,or that is not compatible with overhead utility Iines. f. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DDES prior to engineering plan approvaL g. The street trees mvst be installed and inspected,or a performance bond posted prior to recording of the pla�If a performance bond is posted,the street trees must be installed and inspected within one year of recording of the ptat.At the time of inspection,if the trees are found to be installed per the approved plan,a maintenance bond must be submitted or the performance bond replaced with a maintenance bond,and held for one year.After one year,the maintenance bond may be released after DDES has completed a second inspection and determined that thc trees�ave been k�pt h�althy�d t�riv::.g. A landscape inspection fee shall also be submitted prior to plat recording. The inspection fee is sub,}ect to change based on current County fees. SEPA 20. The following have been established by SEPA as necessary requirements to mitigate the adverse environmental impacts of this development. T'he applicant shall demonstrate compliance with these items prior to fmal approval. Individually,or joint with other azea developers,tl�e Applicant shalI design and construct improvements to Southeast 128th Street at 160`�Ave. SE to mitigate project impacts at the High Accident Locarion. Or,the Applicant shall reduce the project impacts at the High Accident Location by completing the remainder of the improvements to Southeast 136th Street(i.e.additional paving,concrete curbs,gutters and sidewalks),between 158th Avenue SE and 160th Avenue SE,and,revise the channelization at the intersection of 156th Avenue SE/SE 136th Street to provide a southbound left turn lane. School Mitigation Fees 21. Lots within this subdivision are subject to King County Code 21A.43,which imposes impact fees to fund schooi system improvements needed to serve new development. As a condition of final approval, fifty percent(50%)of the impact fees due for the plat shall be assessed and collected immediately prior to recording,using the fee schedules in effect when the plat receives final � L03P0005/L03TY401—Liberty Grove Contiguous 13 approval. The balance of the assessed fee shall be allocated evenly to the dwelling units in the plat and shall be collected prior to building permit issuance. School Walkwavs 22. The Applicant, individually or in conjunction with other developers,shall construct an off-site walkway to Liberty High school from the site. The walkway shall be constructed within the right-of-way from 160th Ave SE,east along SE 135th Street to 166th Ave SE, and south to Lberty High School at SE 136th Street,or via alternative right-of-way and easements that become available and are approved by DDES. One acceptable altemative would be to use future right-of-way of Southeast 136th Street and 162nd Avenue Southeast to connect with the sidewalk improvement of"five iot subdivision,"and through the plat of"five lot subdivision"/LOOP0023 to the southwest gate of Liberty High School. T'he wallcway shall be designed and constructed in � accordance with the 1993 King County Road Standards and shown on the engineering plans for DDES review and approval. Any surfacing altemative from the King County Road Standards(KCRS 3.09)may be submitted for approval through a road variance application. ORDERED this 27th day of February,2004. , � . � am N.O'Connor � g County Hearing Examiner pro 1em i TRANSMITTED this 27th day of February,2004,to the parties and interested persons of record: William J.8owen Wlma J.Bowen Marshall Brenden Bowen Revocable Living Tnut 13644-160th Ave.SE 18225 SE 128th 13644-160th Ave.SE Renton WA 98059 Renton WA 98059 Renton WA 98055 , Carolyn Ann Buckett Thomas Carlyle Melvin L Daley ', 16524 SE 145th St PO Box 581 DMP,INC Renton WA 98059 Tacana WA 98401 726 Aubum Way N ! Aubum WA 98002 Kathy Graves &ad 8 JWie Herrin Gwendolyn High 13020-160th Ave_SE 16202 SE 1371h Pt. P_O_Box 2936 Renton WA 98059 Renton WA 980r9 Renton WA 98056 Vrctor&Gwenddyn High Wa�me Jones Edward June 8�Kris HiU ' 13405-158th Ave.SE Lakeridge Developmerit 1�. 13527 156th Ave_SE � Renton WA 98059 PO Box 146 Renton WA 98059 ', Renton WA 98057 '� Don 8�Diane Kezeie Milton�Helen Lee Rebecca Lind 15657 SE 1371h PL P_O.Box 2574 City of Ren6on,EDNSP Renton WA 98059 Renton WA 9805G 1055 S.Grady Way Renton WA 98056 O L03P0005/I.03TY401—Liberty Grove Contiguous 14 Leroy Nass Kathy Nelson Richard 8 Anita OGphant 15713 SE 128th St Transportation Dept 16519 SE 145th St Renton WA 98059 805-2nd Ave.S. Renton WA 98059 Issaquah WA 98027 Larry&Susan�ord David&Georgia Platt Guy Platz 16013 SE 136th SL 510 Panoramic Dr. 13535-160th Ave.SE Renton WA 98(}59 Camano Island WA 98282 Renton WA 98059 Resident Mike Romano Seatlle KC Health Dept 13020-160th Ave_SE Centurion Development Services E.Dis�Environ_Heaith Renton WA 98059 22617 81h Drive SE 14350 SE Eastgate Way Bothelt WA 98021 Bellevue WA 98007 Deborah Stewart Jesse Thatcher Mke Tul{ 16207 SE 136th St 13817-162nd Ave.SE 16056 SE 136th St Renton WA 98059 Renton WA 98059 Rentoro WA 98059 Mr.8�Mrs_Bob Wilmot Kevin M_YVyrnan Gregg Zirtur►erman 13900-160th Ave_SE 16540 SE 149th St Cily of Re�ton-Plannir►g Renton WA 98059 Renton WA 98059 1055 S Grady Way Renton WA 98055 Greg Borba Kim C[aussen Nidc Gillen DDES/LUSD DDES/LUSD DDES/LUSD MS OAK-DE-0100 Current Planning Site Developrnent Services MS OAK-0E-0100 MS OAK-0E-0100 Kristen Langley Carol Rogers Karen Scharer DDES/LUSD DDESILlJSD DDES/LUSD l.and Use Tcaffic MS OAK-0E-0100 Current Planning MS OAK-DE-0i00 MS OAK-DE-0100 Steve Townsend Larry West Bruce Whittaker DDES/LUSD DDES/LUSD DDES/LUSD Land Use Inspections Geo Review Prel.Review Engineer MS OAK-DE-0100 MS OAK-0E-0100 MS OAK-DE-0100 ' NOTICE OF RIGAT TO APPEAL In order to appeal the decision of the Examiner, written notice of appeal must be filed with the Clerk of II'�i the King County Council with a fee of$250.00 (check payable to King County Office of Finance)on or before March 12, 2004. If a notice of appeal is filed, the original and six (� copies of a written appeal statement specifying the basis for the appeal and argument in support of the appeal must be filed with the Clerk of the King County Council vn or before March 19, 2004. Appeal statements may refer only to facts contained in the hearing record;new facts may not be presented on appeal. Filing requires actual delivery to the Office of the Cierk of the Council, Room 1025, King County Cow�-ttiouse, 516 3�Avenue, Seattle,Washington 98104,prior to the close of business (430 p.m_)on the date due. Prior mailing is not sufficient if actuaI receipt by the Clerk does not occur within the applicable time period. The Examiner does not have authority to extend the time period unless the Office of the Clerk is not open on the specified closing date, in which event delivery prior to the close of business on the next business day is sufficient to meet the filing requirement. 31 L03P0005/L03TY401—Liberty Grove Contiguous 15 If a written notice of appeal and filing fee are not filed within fourteen (14) calendaz days of the date of this report, or if a written appeal statement and argument are not filed within twenty-one (21) calendar days of the date of this report, the decision of the hearing examiner contained herein shall be the final decision of King County without the need for further action by the Councii. Iv1INUTES OF THE FEBRUARY 10, 2004,PUBLIC HEARING ON DEPART'MENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES FILE NOS. L03P0005/LIBERTY GROVE CON'I`IGUOUS(LGC)AND L03P0006/I,03TY403/LIBERTY GROVE(LG)_ James N.O'Connor was the Hearing Examiner in this matter. Participating in the hearing were Karen Scharer,Bruce Whittaker,Nick Gillen and Kristen Langley,representing the Depaztment;Wayne Jones and Dave Casey,representing the Appellant;Gwendolyn High,Intervenor for C.A.RE. and Anita Oliphant,Kristy Hill,Mary Brotherton,Diane Kezele,Rhonda Bryant,and Joann Lee. The following eachibits were offered and entered into the record: Eachibit No. 1 LGC—DDES File L03P0005 Exh��bit No. 2 LG—DDES File L03P0006 Exhibit No. 3 LGC—DDES Preliminary Report for L03P0005,Prepazed January 26, 2004 with attachments as foilows: 3.1 36 Lot Plat Design 32 Density Calculations R-4 w/4 TDRs 33 Issaquah School District 3.4 Certificate of Water Availability dated January 8,2003 3.5 City of Renton Letters,including the Sewer Certif cate 3_6 Certificate of Transportation Concurrency E�ibit No. 4 LG—DDES Preliminary Report for L03P0006,Prepared January 26,2004 with attachments as follows: 4.1 24 Lot Plat Design 4.2 Density Calculations R-4 w/5 TDRs 4.3 Issaquah School District 4.4 Certificate of Water Availability dated January 8,2003 4.5 City of Renton Letters,including Sewer Certificate 4.6 Certificate of Transportation Concurrency Eachibit No. 5 Corrections/Revisions of Conditions to DDES Preliminary Reports (Conditions 7.d. & 12.d)dated February 9,2004—Not Entered into the Record E�chibit No. 6 LGC—Application for Land Use Permit/Plat L03P0005 Received Mazch 1 l,2003 Exhibit No. 7 LG—Application for Land Use Permit/Plt L03P0006 received March 11,2003 Exhibit No. 8 LGC—Revised Environmentat Checklist Received September 3,2003 E�chibit No. 9 LG—Revised Environmental Checklist Received September 3,2003 Exhibit No. 10 LGC—Mitigated Determination of Non-Sign�cance dated December 16,2003 Exhibit No. 11 LG—Mitigated Determination of Non-Significance dated December 16,2003 Exhibit No. 12 LGC—Affidavit of Revised Posting Indicating Posting Date of June 2,2003 And received June 3,2003 E�ubit No. 13 LG—�davit of Posting Indicating Posting Date of June 2,2003 and received lune 3,2003 E�bit No. 14 LGC—Revised Site Plan(36 Lot Preliminary Plat Map)received September 3,2003 O � i ' L03P0005/L03T'Y401—Li�berty Grove Contiguous 16 E�chibit No. 15 LG—Revised Site Plan(24 Lot Preliminary Plat Map)received September 3,2003 Exhibit No. 16 Assessors Maps(2)SE 1423-OS Revised February 3,2000&NE 1423-OS Revised February 28,2000 Exhibit No. 17 Letter w/attachments to DDES from Wayne Jones;Re: Intent to sell TDR-Density Credits dated Apri123, 2003 Exhi�bit No. 18 Traffic Impact Analysis prepared by Gary A.Norris of DN Traffic Consultants dated February 7,2003 and received March 1 l,2003 Elchibit No. 19 Revised Tra�c Impact Analysis prepared by Gary A.Norris of DN Traffic i Consultants dated June 24,2003 and received September 3,2003 � Exhibit No_ 20 Walkway Study Prepared by DMP,Inc_dated August 18,2003 Exhibit No.21 LGC—Walkway Study Map Annotated by DDES prepazed February 9,2004 Exhibit No. 22 March 10,2003 email from Issaquah School District to Ted Cooper regarding School walkways to Liberty High,Maywood Middle and Briarwood Elementary School for plat conditions of LOOP0023 � Exhibit No. 23 Level One Off-Site Analysis prepared by Daley-Morrow-Poblete,Inc. dated March 3,2003 � Eachibit No. 24 Revised Levet One Off-Site Analysis prepared by Daley-Morrow-Poblete,Inc. ' Dated July 11,2003 Extubit No. 25 Conceptual Drainage Plan received March 11,2003 Exhibii Iv'�. 26 Ad�itiona]D��nsueam I:,form.atian r�.�ved November 25,2�►03 Eachbit No. 27 LG—Letter to Wayne Jones and Mel Daley from James Sanders and Jim Chan Dated December 4,2003 regarding drainage ad}ustment(L03V0065) Exlubit No.28 Wetland Evaluation and Delineation Report and Wildlife Habitat Evaluation By Habitat Technologies dated November S,2002 Exhibit No. 29 LGC—Letter to Wayne Jones from Mark Heckert of H&S Consulting dated July 18, 2003;Addendum to the Wetland Evaluation and Delineation Report E�chibit No. 30 LGC—Tributary Area Map Annotations by DDES; Prepared February 2004 Exhibit No. 31 Letter to Karen Scharer&om Anita&Richard Oliphant dated January 29,2004 Requesting comments to LO1P0016&L03RE038 be considered in this matter Eachbit No. 32 Letter to Karen Scharer from Steven&Joann Lee dated February 2,2004 Regarding claim of adverse possession along south property line of LGC Exhibit No.33 Hearing Examiner Report&Decision for EvendelULO1P0016/L03RE038 Issued February 4,2004 Exhibit Nv. 34 Email from Shiriey Day to Karen Scharer dated February 3,2004 Exhibit No. 35 Email from Glenda Johnson to Karen Scharer dated February 10,2004 Exhibit No.36 Letter from Bill &Dona Mokin to Karen Scharer dated February 7,2004 Exlubit No. 37 Photograph of driveway located at SE 136`�/I60'�on February 4,2004 Exhibit No. 38 C_A.RE.Response: Liberty Grove/Liberty Grove Contiguous Plat Applicarions L03P0006&L03P0005 Exh�bit No. 39 C.A.RE. Households List Exh�bit No.40 Community Map Exhibit No.41 March and Apri12000 Press Releases from King County Executive Ron Sims E�bit No.42 King County Metro Six Year Transit Development Plan,February 2002 E�chbit No.43 Repart of the King County General Government Budget Advisory Tasic Force To County Executive Ron Sims dated June 25,2003 Exhibit No.44 A Joint City Posirion—The Cities' Suggesrions for Inclusion in the King County Budget Advisory Task Force's Recommendations dated March 12, 2003 � L03P0005/L03TY4�1—Liberty Grove Contiguous 17 Exhibit No. 45 Message to Employees from King County Executive Ron Sims; GeneraI Budget Advisory Task Force Recommendations dated July 9,2003 Exhibit No.46 King County Council Budget&Fiscal Management Committee Capital Budget Plan,2004 CIP Overview Eachibit No.47 In Transportation—Facing the BudgeYs Challenges from Harold Taniguchi Dated November 3,2003 Exhibit No.48 High Accident Locations Report dated July 2003 Exhibit No.49 Transportation Service Areas 2000 Exhibit No. 50 King County Concurrency Maps 2001,2002 and 2003 Exhibit No. 51 Transportation Concurrency Detail Comparison Graphic Eachi�bit No. 52 City of Renton Long Range Wastewater Management Plan(Excerpts) Exhibit No. 53 2003 King County Annual Growth Report Exhibit No. 54 King County Benchmark Report—2003 (Land use—excerpts) Exhibit No. 55 Buildable Lands Report—Dated August 29,2002 (Excerpts) Exhibit No. 56 State,County,City Populations Exhibit No. 57 City of Renton Economic Development,Neighborhoods,and Strategic Planning Departrnent Reports(June 3,2003; September 23,2003;October 1,2003; October 10,2003) Exlubit No. 58 Renton Planning Commission Recommendation dated October 22,2003 Exhibit No. 59 City of Renton Ordinance No. 5026 Exhibit No. 60 Renton City Council Meeting Minutes dated November 24,2003 Exhbit No. 61 C.A.RE.Member's Letters Detailing Adverse Impacts from High Density Development in this Community Exhibit No. 62 City of Renton Proposed Comprehensive Plan Land Use Map E�chibit No.63 Two Photograpbs of Intersection Exhibit No. 64 Two Photographs of SE l44'�/62°d Ave. SE Exhibit No. 65 List of Individuals and"I'heir Addresses in Attendance Exh�bit No. 66 Letter to Karen Scharer from Claude R &Eloise M. Stachowiak Dated November 16,2003 Exlu�bit No.67 Letter to the Hearing Examiner from Kristy J. Hill dated February 10,2004 E�ubit No. 68 Letter to the Hearing Examiner fi-om Edward&June Hill dated February 10,2004 30C:gao L03P0005/L03TY401 RPT 0 c_-� • - '� REC��T�D King County ��; � � 20D3 Department of Development BY' and Environmentai Services 900 Oakesdale Avenue SW Renton,WA 98055-1219• December 4, 2003 Wayne Jones Mel L_Daley, P.E. Lakeridge Development Daley-Morrow-Poblete, Inc. P.O. Box 146 / 726 Auburn Way North Renton, WA 98057 Auburn, WA 98002 RE: Libertv Grovz Conti�uous Subdivision I998 KCSWDM Ac�justment and Shared Facility Plan Request (File No. L03V0465) Dear Applicant and Engineer: The Land Use Services Division, Engineering Review Section,has completed review of the adjustment request for tne Liberty Grove Conii�uous subdivision. You are requesting approval for an adjustment from the 1998 King County Surface Water Design Manual (KCSWDM) Core Requirement No. 1, Section 1.2.1, Discharge at the Natural Location and approval of a shared facility plan with the Liberty Grove subdivision. Our review of the information and a site visit provides the following findings: 1. The proposed Liberty Grove Contiguous subdivision is located between 160`h and I 162"d Avenues SE, south of SE 136�' Street. The 361ot, 7.9 acre, proposed Liberty Grove Contiguous subdivision is filed under Land Use Services Division (LUSD) file number L03P0005_ The proposed Liberty Grove subdivision is located in the northwest quadrant of the 160`�'Avenue SE/SE 136`h Street intersection. The 24 lot, 4.8 acre, proposed Liberty Grove subdivision is filed under Land Use Services Division (LUSD) file number L03P0006. 2. The Liberty Grove and Liberty Grove Contiguous subdivisions are located in the Orting Hills subbasin of the Lower Cedar River basin. The sites are subject to the Level Two flow control and Basic water quality requirements of the 1998 KCSWDM. 3. The Liberty Grove site slopes gently to the south and southeast, causing sheetflow to migrate to the south property line where it is intercepted by a well defined ditch. The ditch flows east to the west side of 160`h Avenue SE into a well defined channel that proceeds south. Gentle slopes across the Liberty Grove Contiguous site direct sheetflow to the southwest. This results in the eastern portion of the site sheetflowing across the south property line where a constructed swale located on the adjacent parcel to the south carries flows to the midpoint of the common property line. Central flows migrate through an on-site wetland that allows excess flow to join intercepted eastern flows at the midpoint outlet. The drainage path from the defined outlet continues 3S Liberty Grove Contiguou�L03V0065 December 4, 2003 Page 2 of 3 south through a defined open swale that bisects several parcels to the south and ultimateiy flows via stream channel south in the 162"d Avenue SE unopened right-of- way. Sheetflow from the western side of the site migrates to the southwest and eventually reaches the ditch system on the east side of 160`h Avenue SE. Flow &om this portion of the site flows south in the ditch system on the east side of 160`� Avenue SE. Liberty Grove and western Liberty Grove Contiguous flows meet '/4�ile south on 160`h Avenue SE at a newly upgraded culvert crossing. Combined flows then cross parcel #145750-0110 to the east to rejoin eastern Liberty Grove Contiguous flows in the vicinity of the 162"d Avenue SE unopened right-of-way. Both sites have upstream tributary area of several acres. 4. The proposal is to collect most runoff from the Liberty Grove site and divert it to a single, combined detention and water quality facility located in the southwest corner of the Liberty Grove Contiguous site. Flows across the Liberty Grove Contiguous site will aiso be collected and diverted to the single, shared facility. The allowed release would then be proportionally split between the southern flows on the east side of 160`h Avenue SE and the natural discharge path that runs south through the neighboring parcels. Nuisance flows across the south property line of Liberty Grove Contiguous would be significantly curtailed. A small reduction of flow would occur in the western ditch of 160�' Avenue SE, offset by an increase in the eastern ditch. It is not clear if frontage improvements are included in the conceptual drainage plan. 5. No decorative ponds or shallow wells have been identified that would be affected by the proposed diversion. 6. The Level One DQwnstream Analysis identiFed drainage comptaints related to '' conveyance overflows at 14028 160`h Avenue SE (Brenden/Myers) and in the soutt�east corner of the 145750-0110 parcel and adjacent neighbor(Gragg) to the south. Continuing to utilize the natural discharge path that traverses the center of the intervening parcels reduces the volume of total flows that would reach the problem ; conveyance area and would minimize the diversion of flows. The applicant has � offered mitigation in the form of Level Three flow control in the on-site detention system ar.d, via a cembiaation ef flo«�control and s�!itting outflows, maintainir.g predeveloped flowrates to parcel 145750-0110. Potential conveyance upgrades along any of the downstream paths will be addressed in the plat conditions. i 7. Both sites are being developed by the same applicant who intends to build both projects at the same time. 8. A consolidation of facilities for the proposed subdivisions will be more economical in Iong term maintenance. Based on these findings, we hereby approve this adjustment to allow the diversion of runoff to a single, shared facility draining via flow splitter to two downstream paths with the following conditions: �6 Liberty Grove Contiguous/L03V0065 December 4, 2003 Page 3 of 3 1. The release rates for the detention facility will be based on all of the tributary area to be developed being directed to the facility. 2. The volume for the detention facility will be based on all flows directed to the facility at full development under current zoning. The allowed release rate will be reduced by any undetained flows that would bypass the proposed subdivision drainage facilities. The detention volume shall be sized using the Level Three flow control standard in the I998 KCSWDM. A 10 to 20 percent volumetric factor of safety must be applied to all storm events requiring detention. The design Technical Information Report shall state the factor of safety selected and the basis of that determination. 3. Water quality facilities must be sized based on the entire proposed subdivision draining to the facilities including any required frontage improvements. 4. All onsite or offsite drainage facilities must be located in a public right-of-way, recreation space tract with easement or storm drainage tract dedicated to King County. 5. Developed flows from Liberty Grove must be conveyed via tightline to the drainage facility located in the Liberty Grove Contiguous site. If not built concurrently, Liberty Grove Contiguous must precede Liberty Grove. 6. Additional storm drainage requirements identified by SEPA or the plat hearing review � will apply to this project. If you have any further questions regarding this KCSWDM adjustment or the design requirements, please contact Mark Bergam at(206) 296-7270. Sincerely, '� - j-- . '' � i �', �1 �.: _.__ __ ,� ;. __f i - James Sanders, P.E. Jim Ch�; P.E_ ' Development Engineer Supervising Engineer Engineering Review Section Site Engineering and Planning Section Land Use Services Division Building Services Division cc: Curt Crawford, P.E., Managing Engineer, Stormwater Services Section, KCDNR Randall Parsons, P.E., Engineer III, Engineering Review Section, LUSD Bruce Whittaker, Engineer III, Engineering Review Section, LUSD Karen Scharer, Project/Program Manager II, Current Planning Section, LUSD Mark Bergam, P.E., Engineer III, Engineering Review Section, LUSD 3� `/�— � . �\ �' Kin C ount g Y Department of Development and Environmental Services State Environmental Policy Act (SEPA) Mitigated Determination Of Non-Significance for Liberty Grove, File No. L03TY403 & L03P0006 Date of Issuance: December 16, 2003 Project: Proposed is a rezone from R-4 to R-6 and subdivision of the 4.6 acre site into 24 lots for detached single farnily residences and tracts for recreation and drainage facilities. The applicant proposes to use 5 density credit transfers to plat the 24 lots,if the rezone is denied. Location: The site is located north of SE 136`h Street, between 158�Ave. SE and 160�'Avenue Southeast King County Permits: Rezone and Formal Plat County Contact: Karen Scharer, ProgramlProject Manager II Phone: (206) 296-7114 e-mail—karen.scharer@metrokc.gov Propanent: Wayne Jones Lakeridge Development PO Box 146 Renton, WA 98057 (425) 228-9750 Existing Zoning: R-4 Draivage Subbasin: Orting Hills subbasin of Cedar River Section/Township/Range: SE 14-23-5 Notes: A. This finding is based on review of the project site plan received 1�4arch 11, 2003 for 24 lots; revised Environmental Checklist,dated September 3, 2043; Conceptual Drainage Plan;Level One Downstream Drainage Analysis, Revised July 11, 2003;Drainage Adjustment, approved December 4, 2003 (L03VOQ65); Wetland Report by Habitat Technologies, dated November 5,2002;Addendum Wetland Report, H&S Consulting,July 18,2003; 7'raffic Impact Analysis, dated February 7,2003; and other documents in the file. B. Issuance of this threshold detemunation does not constitute approval of the pernut(s). This proposal will be reviewed for compliance with all applicabte King County policies, codes which regulate development activities, including the Uniform Fire and Building Codes, Road Standards, Surface Water Design Manual, and the Sensitive Areas Regulations. C. The density with this plat of 241ots would yield an average density of 5.2 dwellings per acre(based on the net buildable area). This density requested is within ihe density range of 4-12 dwelling units per acre as shown on the Land Use Map of the King County Comprehensive Plan_ The lots will mostly be 6,000 square feet in area and have a width of 60 feet. 38 Liberty Grove Rezone & Plat- _.iDNS December 16, 2002 Page 2 D. The proposed projec�will send trips into the intersection of Southeast 128th Street at 160th Avenue Southeast which has, as of June 2003,been placed upon King County DOTs High Accident Location list(ID: HAL#16). The recommended countermeasure is to construct both east and west left turn channelization at the intersection. � These improvement measures are appropriately required prior to King County approving furiher development that would reduce the level of safety by adding vehicles trips to this intersection. Therefore,due to the additional impacts,mitigation ofproject impacts at this intersection is necessary and could be accomptished with the recommended road widening and channelization. Alternatively, development impacts could be mitigated and improvements at the intersection could be deferred if another local access route would be provided. T'ne alternarive local access route will be at SE 136'� St.between 156`�Ave. SE and 160�'Ave. SE. As a result of submittal of a major revision of the plat of Evendell, Southeast 136th Street is again proposed to be constructed by the Applicant of Evendell. Their proposed improvements include a 'hatf-street' improvement opposite the frontage of the proposed plat of Liberty Grove. Completion of the balance of the improvements by this Applicant of Liberty Grove could provide a more attractive alternative route for project-generated trips that would otherwise enter the HAL identified by King County DOT. Typically,absent a direct connection to this roadway, improvements to Southeast 136th Street by the Applicant for the proposed plat of Liberty Grove would not be required as a condition of plat approval. However, by completing the improvements to Subcollector Street(Urban) standards, project-generated trips of the plat of Liberty Grove would have an alternative westbound access (towards the City of Renton) along Southeast 128th Street at the signalized intersection of 156th Avenue SE. Additionally,project-generated trips would have the altemative access to SR-169 from plat-generated trips by use of SE 136�'Street(in lieu of traveling northbound on 160"`Ave. SE., making the left turn at the intersection of 128`�Street—the HAL—and another. left turn at the 156`� Ave. SE signal). E. Renton will provide sewer service. Extension of a 10"or 12"diameter sewer trunk will be located along SE 136''' St. and a sewage pump station will be required off site to provide service. Threshold Determination The responsible official finds that the above described proposal does not pose a probable significant adverse impact to the environment,provided the mitigation measures listed below are applied as conditions of permit issuance. This finding is made pursuant to RCW 4321C,KCC 20.44 and WAC 197-11 after reviewing the environmental checklist and other information on file with the lead agency and considering mitigation measures which the agency or the applicant will implement as part of the proposal. The responsible official fmds this information reasonably sufficient to evaluate the environmental impact of this proposal. Mitigation List The following mitigation measures shall be attached as conditions of permit issuance for the plat. These mitigation measures are consistent with policies,plans,rules,or regulations designated by KCC 20.44.080 as a basis for the exercise of substantive authority and in efTect when this threshold deternunation is issued. Key sources of substantive authority for each mitigation measure are in parentheses;however, other sources of substantive authority may exist but are not expressly listed. � Liberty Grove Rezone & Plat- _.iDNS December 16, 2002 Page 3 Individually, or joint with other area developers,the Applicant shall design and construct improvements to Southeast 128th Street at 160`�Ave. SE to mitigate project impacts at the High . Accident Location. Or,the Applicant shall reduce the project impacts at the High Accident Location by completing the remainder of the improvements to Southeast 13bth Street(i.e. additional paving, concrete curbs, gutters and sidewalks),between 158th Avenue SE and 160th Avenue SE, and,revise the channelization at the intersection of 156th Avenue SE/SE 136th Street to provide a southbound left turn lane. Comments and Appeais Written comments or any appeaI of this threshold determination must be received by King County's Land Use Services Division prior to 4:3U PM,January 9,20G4. Appeais must be accompanied'oy a nonrefundable filing fee_ Please reference the file numbers when corresponding. Appeals must be in writing and state the perceived errors in the threshold deternunation, specific reasons why the detennination should be reversed or modified,the harm the appellant will suffer if the threshold determination remains unchanged, and the desired outcome of the appeal. If the appellant is a group,the harm *.o a.*:y enP or an�re mP::abers r.2�.:s±be s±ate�. Fail2:r� to meet t��se r�Gnirer.:�r.ts may result i.^d:s:nissa. of t�:e appeal. CommenUappeal deadline: 4:30 PM on January 9, 2004 . Appeal fiting fee: $250 check or money order made out to tbe King County Office of Finance Address for comment/appeal: King County Land Use Services Division 900 Oakesdale Avenue SW Renton,WA 98055-1219 ATTN: Current Planning Section ' Responsible Official: � t _ � ' � �� / G 3 � Greg Borba, Current Planning Supervisor Date Si ed I, Current Planning Section , ; Land Use Services Division ' � I , - � Date Mailed: ppcpmber 16, 2003 '', I ' i ,I ', i � ' i i ' i '� � �«- -�t�.� �,�� ' . �t� 1 7 2��3 '� ' �' Kin Count B . i , g Y Y. � �, Department of Development and Environme Services i State Environmental Policy Act (SEPA) I;� _ Mitigated Determination Of Non-Significance for I� Liberty Grove Contiguous, File No. L03TY401 & L03P0005 Date of Issuance: December 16, 2003 . Project: � Proposed rezone from R-4 to R-6 and subdivision of the site into 36 lots for detached single family residences and tracts for sensitive areas, recreation and drainage facilities. The applicant proposes to use 4 . density credit transfers to plat the 36 lots, if the rezone is denied. Location: Th naite is located south of SE 136�' Street, between 160`�Ave_ SE and ct� 162 Avenue Southeast � Kiug County Permits: Rezone and Formal Plat I County Contact: Karen Scharer, Program/Project Manager II Phone: (206) 296-7114 e-mail—karen.scharer@metrokc.gov Proponent: Wayne Jones I Lakeridge Development PO Box 146 � � Renton, WA 98057 � (425) 228-9750 � � Ezisting Zoning: R-4 � ' Drainage Subbasin: Orting Hills subbasin of Cedar River I Section/Township/Range: SE 14-23-5 �II Notes: A_ This finding is based on review of the project site plan received March 1 l, 2003 for 36 lots; revised I Environmental Checklist,dated September 3,2003; Conceptual Drainage Plan;Level One Downstream Drainage Analysis, Revised July 11,2003;Drainage Adjusiment, approved December 4, 2003 (L03V0065); T3'etland Report by Habitat Technologies, dated November 5,2002;Addendum YYetland Report, H&S Consulting,July 18,2003; Tra�c Impact Analysis, dated February 7, 2003; and other documents in the file. B. Issuance of this threshold determination does not constitute approval of the permit(s}. This proposal will be reviewed for compliance with all applicable King County policies, codes which regulate development activities, including the Uniform Fire and Building Codes,Road Standards, Surface i� , Water Design Manual,and the Sensitive Areas Regulations. C. The density with this plat of 361ots would yield an average density of 4.7 dwellings per acre(based on the net buildable area). This density requested is within the density range of 4-12 dwellin units er g P acre as shown on the Land Use Map of the King County Comprehensive Plan. The lots will mostly be � Liberty Grove Contiguous Rezone and Plat-MDNS December 16, 2002 Page 2 5,600 square feet,but would range from 4,400 square feet to 8,700 square feet in area. Most lots would also have a width of 53 to 56 feet. D. The proposed project will send trips into the intersection of Southeast 128th Street at 160th Avenue Southeast which has, as of June 2003,been placed upon King County DOT's High Accident Location iist (ID: HAL #16). The recommended countermeasure is to construct both east and west left turn channelization at the interseciion. These improvement measures are appropriately required prior to King County approving further development that would reduce the level of safety by adding vehicles trips to this intersection. Therefore,due to the additional impacts,mirigation of project impacts at this intersection is necessary and could be accomplished with the recommended road widening and channelization. Altematively, development impacts could be mitigated and improvements at the intersection could be deferred if another local access route would be provided. The altemative local access route will be at SE 136`h St_ between 156`''Ave. SE and 160`h Ave. SE. As a result of submittal of a major revision of the plat of Evendell, Southeast 136th Street is again proposed to be constructed by the Applicant of Evendell. Their proposed improvements include a 'half-street' improvement opposite the frontage of the proposed plat of Liberty Grove(L03P0006). Compietion of the balance of the improvements by this Applicant of Liberty Grove Contiguous could provide a more attractive altemative route for project-generated trips that would otherwise enter the HAL identified by King County DOT. Typically, absent a direct connection to this roadway, improvements to Southeast 136th Street by tt�e Applicant for the proposed plat of Liberty Grove Contigubus would not be required as a condition of plat approval. However,by compieting the improvements to Subcollector Street(Urban)standards, project-generated trips of the plat of Liberty Grove Contiguous would have an altemative westbound access (towards the City of Renton)along Southeast 128th Street at the signalized intersection of 156th Avenue SE. Additionally,project-generated trips would have the alternative access to.SR-169 &om plat-generated trips by use of SE 136`�' Street(in lieu of traveling northbound on 160`�Ave. SE., making the left turn at the intersection of 128`h Street—the HAL—and another left tuin at the 156"' Ave. SE signal). E. Renton will provide sewer service_ Extension of a 10"or 12"diameter sewer trunk will be located along SE 136`� S� and a sewage pump station will be required off site to provide service. Threshold Determination � The responsible official finds that the above described proposal does not pose a probable significant adverse impact to the environment,provided the mitigation measures listed below are applied as conditions of permit issuance. This finding is made pursuant to RCW 43.21C,KCC 20.44 and WAC 197-11 after reviewing the environmental checklist and other information on file with the lead agency and considering mitigation I� measures which the agency or the applicarit will implement as part of the proposal. The responsible official finds this information reasonably sufficient to evaluate the environmental impact of this proposal. Mitigation List The following mitigation measures shali be attached as conditions of permit issuance. These mitigation measures are consistent with policies,plans,rules, or regulations designated by KCC 20.44.080 as a basis for the exercise of substantive authority and in effect when this threshold detemunation is issued. Key sources of � Liberty Grove Contiguous Rezone and Plat-MDNS December 16,2002 Page 3 substantive authority for each mitigation measure are in parentheses;however, other sources of substantive authority may exist but are not expressly Iisted. Individually, or joint with other area developers,the Applicant shall design and construct improvements to Southeast 128th Street at 160`�'Ave. SE to mitigate project impacts at the High Accident Location. Or, the Applicant shall reduce the project impacts at the High Accident Location by completing the remainder of the improvements to Southeast 136th Street(i.e. additional paving, concrete curbs, gutters and sidewalks),between 158th Avenue SE and 160th Avenue SE, and, revise the channelization at the intersection of 156th Avenue SE/SE 136th Street to provide a southbound left ' - tum lane. Comments and Appeals Written comments or any appeal of this threshold detemunation must be received by King County's Land Use Services Division prior to 4:30 PM,January 9, 2004. Appeals must be accompanied by a nonrefundable filing fee. Ptease reference the file numbers when corresponding. Appeais rritisi be in w-riung and state t�e perceiveci errors in tne tnresnoid determinarion,specific reasons why the determination should be reversed or modified,the harm the appellant wi11 suffer if the threshold determinarion remains unchanged,and the desired outcome of the appeal. If the appellant is a group,the harm to any one or more members must be stated. Failure to meet these requirements may result in dismissal of the appeal. Comment/appeal deadline: 4:30 PM on January 9,2004 Appeal filing fee: $250 check or money order made out to the King County O�ce of Finance Address for commendappeal: King County Land Use Services Division 900 Oakesdale Avenue SW Renton,WA 98055-1219 ATTN: Current Planning SecUon Responsible Officia�: � • �` / Z O Greg Borba, Curr nt lanning Supervisor Date Si ed Current Planning Section Land Use Services Division Dace Mailed: December 16, 2003 �l3 , - - __ � . ., - �':�� . . _ RESPONSE TO LIBERTY GROVE PLAT CONDITIONS l.a. All platting provisions of Title 19 of the I�ing County Code have been met. �_b. Liberty Grove Contiguous will be recorded prior to recording of Liberty Grove. 2. All persons having an ownership interest wiil sign the f nal plat. 3.a. The plat meets the reqwrements of the R-4 zoning classification. 3.b. The applicant will provide Transfer of Density Credit documentation to D.D.E.S_ prior to final approval. 4. The appl�carrt will ohtain final approval from the King County Healttt DeparttneIIt for abandonment of e�sting septic systems on-site. 5. All roads have been designed in accordance with King County Road Standards. 6_ The Applicant will obtain approval o�the King County Fire Protection Engineer for water mains and fire flows as part of the water plans. 7. a. The plans have been prepared in accordance with 1998 King County Surface Water Design Manual and applicable upciates adopted by King County. , Constructian will begin only upon DDES approval. �� b. The currerrt notes are shown on the plans. c. T'he"Beeilding Da;unspout:?�Ivte"�i�l t�s�o�vn on ihP final Yl�t. d. The storm water coimol facility will be located in a separate tract within the Liberty Grove Contiguous plat. 8. Flows fmm Liberty Crrove and Liberty C�rove Contiguoc�s will be combined and will discharge into the detention facility within Lib�rty Grove Contiguous. A flow splitter will be installed to allow oniy the equivalent amount of flow from the development areas into the detention faciiity. 1'he flows to the soutb will be maintained 9. The detention facility was designed per the Levei 3 flaw control standard and meets the basic quality menu. 1Q. The pige will be upgraded as required. The sizing catculation will be included in Section V of this report. 11. See response to Cor�dition 1S_ � �—la. .,.}. ... , .. r_.. - , l2. a. SE 135`�Piace will be improved to the urban subaccess standard,however, the pavement width was increased to 26 feet. b. The west side of the frontag�aIong 160`�Avenue SE will be impr�ved to the urban neighborhood collector standard. c. The north lZalf of SE I 36`�Street will be improved to the urban hatf street standards. d Tract A will be a private access tract, and wilf be owned and maintained by the Lot being served Tract C wi11 serve more than 2 lots, and will therefore be a pnvate fract as well. Tract D will be a joint use driveway. 13. All e�tilities within the R.O.W. will be included within a franchise apprvved by King Couniy. 1�. The Applicant will pay the MPS fee and admirristration fee. i 5_ SE 136� Street will be improved,therefore the wetland area and its buffer are not shown. , 16. Final plat issue. �'i 17_ The tecreational space glan requirements were addressed as follows: I a. A detailed recreational space pIan will be provided. h. A pe�o*�a��r_d wii}�e pvst�.��t�*�rding vf+hP Y1_�. 18. A homevwners' assaciatian witl be established. 19. The street tre�e requireinents were addressed as follows: a. A Street Tree Plan will be added to the plan set prior to engineering plan approval. b. Trees wiIl be lacated within the R.O.�V. whenever possible, otherwise, the i trees will have to be Ioeated i�the lots where there is not enough R.O.V�. c. Location of the tcee wili be shown on the Street Tree Plan for the County's review. d. Final plat issue. e. The street tree specie wi11 come from the approved King County street tree list. : � f. A Street Tree Plan will be added to the plan set. 'I'he bond quantity sheet will be provided. g. Final plat issue. 20. The applicarrt is working with other area developers with regards to the required improvements. 21. The applicant will pay the required fees. 22. The applicant is working with other area developers witt�regards to the required school walkway. , � , � I � I ! � I � RESPUNSE TO LIBERTY GROVE CONTIGUOUS PLAT CONDTI'IONS • 1. Atl platting provisions of Title 19 of the King County Code have been met. 2. All persons having an ownership interest will sign the final plat. 3. a. The piat meets the requirements of the R-4 zoning classification. b. Tl�e applicant wiIl provide Transfer of Density Credit d�cumentation to D,D.E.S. prior to fnal approval. c. Fence encroackment will be resolved to the satisfaction of King county DDES LUSD. 4. The applicant will obtain final approval frvm the King County Health Department for the abandonment of exis�ing septic systems and drainfields on-site_ 5. All roads have been designed in accordance with King Caunty Road Standards. 6. The Applicant will obtain approval of the King Courrty Fire Protection Engineer far water mains and fire flows as part ofthe vvater plans. 7. a. The plans have been prepared in accordance with 1998 King County Surface Water Design Manual and applicable updates adopted by King County. Consrivction wiil begin only upon DDES apprvval. b. The curretrt notes are shown an the p�ans. c. The"Building Downspout Note"will be shown on the final plat. d. The storm water co�rol facility will be located in a separate tract. 8. See res�onse to drainage adjustment. 9. The detention faciiity was designed per the Leve13 flow control standard and meets the basic quality menu. t0. The pipe will be npgraded as required. The sizing calculation will be included in Section V of this report. 1 I. The downstream pipe(See pages 82 and 83 of Seciion III)has an invert of appro�mately 457.80. The top of the existi�g grade around the pipe is about 3_5 feet high. The downstream overflow elevation is therefore approximately at elevation 461.30. The Iowest ho�se in Liberty Grove Contiguous wiIl be in Lot 23, and will have a finished floor elevation on agproximately 454.00. The hause will therefore be more than 2 feet above the overflow elevarion. This project is �7 therefore exempt per Lhe exemption in Sectian 4.4.2.1. A note was added to the engineering ptans specifying that the fnished floor elevations within the new subdivision can be no lower that 463.30,which is two feet above the overflow elevation. In the event that water reaches the overflow elevation,water will begin to disperse within a wide area and will continue south. By inswir�g that the new buildings are at least 2 feet above the overflow eievation, we are confident that no house will be flooded 12_ a. SE 137�Street will be improved to the urban subaccess stand�rds,however, the pavement widtb was increased to 2b feet. b. 162"�Fl,ace SE wi11 be improved ta the urban subaccess si�eet sta.ndard from SE 137�' Stteet to SE !36`� Street,however,the pavement width was inc;eased to 26 feet. �62°d Plaee SE will be impr�ved to minor aceess street south of SE �3'7`�' Street, �xcept that the pavement width�vas increased to 26 feet. c. The eas�side of 16Q�'1�ven�e SE from the so�zth plat boundary to�E 136`� Street will be improved to neighborhood collector standards, d. The south side of SE 13b`�'Street from 16a�'Avenue SE to 1b2�Avenue SE wili be improved to the wban neighbonc��ad collector standa.rd,except for tt�e firs# 270 feet east of I60�'Avenae��. See plans fpr proposed improvements. e. Tracts D and E will be improved as joint use driveways. The tracts will be owned and maintained by the owners of the Iots being served f. The R.O.W. radi�s will be provided at the nort�east corner of L�t 9 as rec}uired. g. No modifications are proposed. �3. All utilities within the R.O.W. wiil be included within a francluse approved by King Cou�ty. 14. The Applicant will pay ihe MPS fee and administration fee. 15. a. A 25-foot buffer will be provided arou�d the wetland. See plans. ', b. Buffer averaging will not be used. I, c. The wetland and it's buffer vvill be in a sensitive area tract, and shall be I�� record�i on all documents of ti�1e of record for all af��cted lots. . � vQ d. A 15-foot BSBL will be provided for the lots adjacent to the wetland buffer. See plans. e. Sensitive areas will not be impacted by this development. �, f. The sensitive areas will be marked prior to construction. See T.E.S.C,plan. g. Permanent signs will be placed around the sensitive area tract. See T_E.S.C. plan for loca.tion. h. See Section IV of this T.I.R. for the wetland hydrology analysis. i. See plans for proposed location of out-fall to wetland. j. Required permits will be acquired prior to beginning construction. k. No action required at this time. 16. The note is shown on the engineering plans. The note will also be added to the final plat map. 17. The recreational space plan requirements were addressed as follows: a. A detailed recreational space plan will be provided prior to final plan approval. b. See response to 1'7.a. c. See response to 17.a. 18. A homeowners' association will be estabiished_ 19. The street tree requirements were addressed as follows: a. A Street Tree Plan will be prepared and will be attached to the plan set. b. Trees wi11 be located within the R.O.W. whenever possible,otherwise, the trees will have to be located in the lots where there is not enough R.O.W. , c. Location of the tree will be shown on the Street Tr�Plan for the County's I review. d. Final plat issue. e. The street tree specie will come fram the apprvved King County street tree list. � f. A Street Tree Plan will be prepared and wi11 be attached to tne plan set. The bond quantity sheet will be provided. g. Final plat issue. 20. The applicant is working with other area developers with regards to the required improvements. 21. The applicarn will pay the required fees. 22_ The applicant is working with other area developers with regards to the required schooi walkway. So RESPONSE TO DRAINAGE ADJUSTMENT CONDTI'IONS 1. The release rates for the detention facility are based on all of the tributary areas proposed to be developed 2. The volume for the detention is based on a11 flows directed to the facility at full development under current zoning. The bypass was considered in the sizing of the detention facility. The Level 3 Flow Control standard was used to determine the required storage volume. A 12 percent factor of safety will be provided. The adequacy of the factor of safety is explained in Part D of Section IV. 3. The water quality facility was sized based on the entire proposed subdivision and any required frontage improvements. 4. All on-site or off-site drainage facilities will be located in a public R.O.W., recreation space tract with easement or storm drainage tract dedicated to King County. 5. Flows from Liberty Grove will be tight-lined to the drainage facility within Liberty Grove Conriguous. Both developments will be developed concurrently. 6. There are no additional drainage requirements in SEPA. �/ SECTION III OFF-SITE ANALYSIS I; I TABLE QF CONTENTS TASK 1: Study Area Definition and Maps General Information On-Site Drainage Analysis Upstream Drainage Analysis Downstream Drainage System Description Future Site Conditions TASK 2: Resource Review 1. Flood PIaiNFloodway (FEMA) Maps 2. Offsite Analysis Reports 3. Sensitive Areas Information 4. SWM Division Drainage Investigation Information 5. King County Soi(s Survey Maps TASK 3: Field Inspection 1. Investigation of Reported or Observed Problems During Resource Review 2. Location of Existing/Potential Constrictions or Lack of Capacity in the Existing Drainage System 3. Identify ExistinglPotential Flooding Problems 4. Identify ExistinglPotential Overtopping, Scouring, Bank Sloughing, or Sedimentation 5. Identification of Significant Destruction of Aquatic Habitat or Organisms 6. Collect Qualitative Data on Land Use, Impervious Surfaces, Topography and Soil Types 7_ Cvllect Information on Pipe Sizes, Channe! Characteristics and Drainage Structures 8. Verify Tributary Basins Delineated in Taslc 1 9. Contact Neighboring Property Owners in the Area 10. Note the Date and Weather Conditions at the Time of the Site Visit TASK 4: Drainage System Description and Problem Description 1. Drainage System Descrip#ions 2. Problems TASK 5: Mitigation of Existing or Potential Problems 0 r-,. . . ��f� EXt'trbft�k \'f�i€titY Map- Exhibit B D�irr� Basirr RIfaR F�chibit C Dovmstream Dra�nage 8ystem(dtap Exhibit E? FE�I#A Map Exhibit E Ass�ssors N4ap Exhrbit F Sensitive Afeas informatiorr , Exhibit G SVV�I# Division Drainage Mvestigation irfforr�atioR '� Exhibit H King Cout�ty Soits Survey 1Nap Exhibit f 4ff-Site Anafysis Qrainage System Tabte Exhibit J S�t�P#an of Libert}� Gruve & �iberty Grove Con#iguous Exhibit K �vpy of December 5, 2UO2 ietter from Haozotrs Er:gineering Exhibit L Copy af Noveml3er 27, 2002 lefter from Ms. Laura Casey 0 - TAS(r� 1: Stualy Area Definition and P�iaps General Information The proposed Liberty Grove and Liberty Grove Contiguous developmen#s will be within three separate parcels, located near the northwest and southeast corners of the intersection of SE 136"' Street and 160�'Avenue SE. Parcel 3664500141, which is located near the northwest comer of said intersec#ion, will be designated as °Parcel A" in this report_ Liberty Grove will be entirely within Parcel A. Parcels 1457500085 and 1457500090, which are located near the southeast comer of the previously mentioned in#ersection, will be designated as "Parcel B� in this report. Liberty Grove Contiguous witt be entirety within Parcel B. The parcels are located within the NE and SE quarters of Section 14, Township 23 North, Range 5 East, Wllamette Meridian, IUng County Washington. The project site is located within an area zoned R-4. Since both projects wil( be developed at the same time, and in fact will share the same detention facility, this off-site anatysis will be fior both projects. There is an existing house and shop within Parcel A, with the remainder of the site mostly covered with grass and some tree. Parcel A is approximately 4.84 acres and generally drains to the south. There are two houses within Parcei B, with associated structures. The 7.92-acre parcel is presently forested in the northeast comer, wi#h the remainder of the site being dominated by pasture land. There is a wetland area within the sauthwest comer of Parcel B, which witl remain, and will be protected by a 25-foot buffer. Site soils have been ident�ed as Alderwood gravelly sandy loam by the U.S. Soil Conservation Service (SCS}. On-Site Drainaqe Analvsis Parcel A has an average stope of approximately 3.6 percent, and generally drains to the south via sheet flow. Parcel B has an average slope of 4 percent, and genera(ty releases water along the southem property tine. Uustream Drainaqe Analvsis As shown in Exhibit B, Parce!A receives n.moff from approximatefy 2.5 acres. The upstream basin is presentty covered with trees, pasture land, grass and some houses. Water from said basin enters the site via sheet flow along the northem property tine. Parcel B has an upstream area of approximatefy 0.95 acres, plus 7_6 acres to the wettand. This basin is partialty fiorested, but is dominated by single-family houses with a density of approximatety 6 DUIGA. Water from the upstream area mostly enters the site via culvert that discharges near the northem property line, and into a ditch #hat flows to a wetland area within the site. There are minor flows from the ditch near the northeast comer of Parcel B. The ditch continuous sou#h and starts to broaden. Water#hen enters the site, disperses and eventually drains into the wetland area. � Downstream Drainage Svstem Description As previously described, there are two separate areas to be devetoped as part of#his project, which are designated as Parceis A and B. Parcel A presentty discharges into an earth-lined ditch along its south property line. Water then enters a ditch aiong the western side of 160"'Avenue SE and continues to flow south. Approximately %-mile downstream, a new 24-inch diameter ADS N-12 culvert interoepts water and brings it across 160"' Avenue SE. We are proposing to bypass the above mentioned downstream system as part of the development, and will therefore provide no further analysis of said system. Furthermore, said system will most likety be improved by the proposed Evendell Plat, located south of Parcel A. tt is proposed to collect runoffi from the developed Parcel A and its upstream tributary area, and convey it to the proposed detention facitity within Parcel B. The existing downstream facilities from the proposed detention facility will therefore be described in more detail in this repor#. Parcel B presently discharges runoff aiong its south property iine. However, most of the runoff passes thru an on-site wetland located near the southwest comer of Parce! B. Water that is reieased by the wetland is collected by a yard drain located within the adjacent parcel to the south. We were unable to enter the property to collec# more information about the system within said property. Although we were unable to collect more information about the above me�tioned yard drain, we believe this system will be inadequate to handle runoff from the proposed development. The County may however, require the existing hydrology to the wettand be retained, and therefore, the yard drain will continue to receive #he same amount of runoff. tt i� p.ro�s� to const�uct th� detent�en faci!ity wrthi� ±he sou#heast comer�f Parce! S. Discharge will be to the existing conveyance facilities atong the east side of 160"' Avenue SE. The drainage facilities consist of driveway cufverts and drainage ditches. The system components are shown in Exhibit C, and are itemized in the Off-site Analysis Drainage System Table (Exhib+t I). There have been several complaints within this downstream system, copies of which are included in Exhibit G. Furthermore since we are proposing to convey runoff from Parcel A to this system, the facility will have to convey more flows. We are therefore proposing to improve the conveyance facilities between point 1 to point 24 (See Exhibits C and !). The new conveyance system will be designed to handle the peak flow rates. Points 25 through 30 have recently been upgraded. � . __ . _ ,f , - _ ,. ..,�-� . . . .. ; Future Site Conditions This development involves the creation of sixty single-family residential lots within Parcels A and B. Access roads and roadway improvements will also be a part of the development_ As previousiy stated, the detention f�cility wiii be constructed in the southeast comer of Parcel B. A wetpond, sized per the Basic Water Quality Menu, will be constn.rcted below the detention facility_ The proposed facility will discharge to the facilities along the east side of 160"'Avenue SE. There have been several recorded complaints along this downstream route (See Exhibit G). Due to the proposed plan to convey water from Parcel A to Parcel B, runoffi to the downstream faci�ities on the eastside of 160�'Avenue SE will be increased. It is therefore proposed to improve a portion of the downstream facilities to handle the post-development flows, and will be further discussed in Task 5 of this report. Per discussion with Mr. Bruce Whitaker of King County D.D.E.S, it is our understanding that developments within the basin will be required to provide downstream improvements, in lieu of the Level 3 Flow Control requirement. Although we were previously proposing to use the Level 2 Flow Control criteria together with downstream improvements, not all downstream faciiities are within the R.O.W. and therefore cannot be easily upgraded. Beyond point 30, the ditch begins to disappear. Water then disperses within the private property and then collects in a ditch, then continuous east. Although there have not been any drainage complaints from the property owners, it appears that the drainage facilities within said property will be inadequate to convey flows beyond p�e-development rates. In lieu of upgrading facilities beyond point 30, we are proposing to upgrade the conveyance facilities from the project site to point 24 together with the Level 3 Flow Control criteria. Another attemative is to provide the Level 2 Flow Corrtrol criteria and provide adequate oonveyance along 1fi0"'Avenue SE down to SE 144�' Street, which will prevent water from entering private property. The pond shown in the Conceptual Drainage Plan, in our estimation, will be able to accommodate a pond sized per the Leve! 3 Flow Control criteria. � Flow to the existing wetland wilt be calculated and maintained by allowing some roof and yard runoff to drain directly into the wetland. Runoff from upstream areas, presently draining into the wetland will be collected and discharged directly into the wetland. There is a proposed development called Evendell Ptat, which is located south of Parcel A and across the street from Parcel B_ A Level 3 downstream analysis, dated August 26, 2002 has been prepared by Haozous Engineering for said development. The analysis was later supplemented by a letter from Houzous Engineering, dated December 5, 2002 (See Exhibit t�, which identfied conveyance facilities that need to be upgraded. We believe that with the improvements proposed by Liberty Grove and Liberty Grove Contiguous, and together with the improvements for Evendell Plat, most o#the downstream problems will be eliminated. � _ , � ,._.f _. . . ,. � TASK 2: Resource Review The following is a description of each of the resources reviewed in preparation of this Downstream Analysis: 1. Flood Plain/Floodway lFEMA) Maps The site is not within a 100-year floodplain_ Refer to Exhibit D. 2. Offsite Analysis Reports We have reviewed the Level 3 Downstream Drainage Analysis for the Evendell Plat. Evendell Plat is located south of Parcel A and west of Parcel B. We also reviewed a supplemental letter, dated December 5, 2002, which lists the downstream facitities that need to be upgraded by the Evendell Plat (See Exhibit �. We have afso review the Preliminary Technical Information Report for Evendell Plat, dated June 15, 2001. 3. Sensitive Areas Information We have included a printout from the King County website as Euhibit F in this report. The printout shows that there are no sensitive areas on or adjacent to the site. However, a wetland area has been identified near the southwest comer of Parcel B. A wetland evaluation and delineation report has been prepared by Habitat Technologies_ The report, dated November 5, 2002 has been review by Ms. Laura Casey of King County's Critical Areas Section. See Exhibit L for a copy of the lett2r from Ms. Casey. The wetlard area is shawn on the �nceptuai drainage plan, and will be within a Tract. 4_ SWM Division Drainage Investiqation Information 'i There have been several recorded c:omptaints, both on-site and within the downstream flow path. In Exhibit G, we have included a map showing the location of where each problem occurred and the comptaint number. We have also incfuded a summary of the pertinent complaints and a copy of each complaint. 5. Kinq Countv Soils Survey Maps The soif underlying the site is Alderwood. A copy of the relevant page from the I King County Soils Survey Map is inGuded as Exhibit H. � TASK 3: Field Inspection � As previousiy mentioned, this project invofves the development of Parcels A and B. � Although the parcels are not connected, they are part of the same basin. Parcel A I presently drains into the facilities along the western side of 160�'Avenue SE, whiie Parcef B presently drains into the eastem side of 160"'Avenue SE. The flows however converge further downstream. It is proposed to divert runoff from the developed Parcel A into the proposed detention facility within Parcef B. This analysis therefore focuses more on the facilities downstream from the proposed detention facility. 1. Investiqation of Reported or Observed Problems During Resource Review There were several drainage problems identfied in the review. Please see F�chibits G, I and K, and also Task 5 of this repo�t. 2. Location of Existinq/Potential Constrictions or Lack of Caaaci#y in the E�dstin,g Drainage Svstem See Exhibit I. 3_ Identify Existinca/Potential Flooding Problems See Exhibits �, I and K 4. Identify Existinq/Potential Overtoppinq. Scourinq, Bank Sloughinq, or Sedimentation See Exhibits G, I and K � 5. Identification of Siqnficant Destruction of Aquatic Habitat or Organisms At the time of the site visit, there where no signs of aquatic habitat or organism destruction. 6. Collect Qualitative Data on Land Use. Impervious Surfaces, Topoqraphv and Soil Tvaes ' Qualitative data has been collected from previous field visits. This information is incCuded within this report. � 7. Collect Information on Pipe Sizes, Channel Characteristics and Drainage Structures See Exhibits C and I. 8. Verifv Tributary Basins Delineated in Task 1 At the time of the site visit, the tributary basins described in Task 1 were verified as being accurate. 9. Contact Neiqhborinq Property Owners in the Area At the time of the site visit, a neighbor living in address 13814 160�'Avenue SE was available during our site visit. This neighbor had previously complained about wafer overflowing from the ditch along the west side of 160�'Avenue SE and flowing into the facility in front of his property, causing said system to fail {See F�chibit G}. This problem has been identfied for the Evendei! Plat also, and improvements were proposed to eliminate this problem (See Exhibit K}. We are also proposing to upgrade this systeM �� €ront of his property. The wetland area witt�in Parc�i B cu�rentiy c�rains acro5s addr�ss i 3ou� 160�' Avenue SE, before discharging into a channel behind the above mentioned neighbor's property (See Exhibit C). Said neighbor stated that he constructed the channel to allowr water to flow�r�ty. He also s�ated that tffe cha��rz� �s dry during summer and wet during winter. He mentioned that there was no problem with fhe system. Furthermore, due to the requirement to maintain the wetland hydrology (See Exhibit L}, the proposed plat of Liberty Grove should not have any effect on the system. 10. Note the Date and Weather Conditions at the Time of the Site Vsit The site and downstream system were visited on Jan. 17 and Jan. 20, 2002. It had just rained prior to our Jan. 20, 2002 visit. 0 TASK 4: Drainage System Description and Problem �escription 1. Drainage System Descrietions: As previousty stated, runoff from the developed Parcel A wifi be conveyed to the detention facility to be constructed within the southeastern comer of Parcel B. Discharge from the detention facility wili be to the drainage facilities along the east side of 1fi0"'Avenue SE, which is the f�us of this report. The existing drainage facilities along the east side of 160"'Avenue SE consist of roadside ditches and driveway culverts. Several complaints have been filed due to the failure of this system. One residence has experience flooding on more than one occasion. Haozous Engineering, in their study of the downstream facilities, prepared a Level 3 analysis. A supplemental letter, dated December 5, 2002, outfining their propased improvements is included as E�chibit K in this report. It is evident that the downstream facilities wiil have to be upgraded to fix the ongoing problems within said system. 2. Problems: A summary of the different complaints is included in Exhibit G. P(ease se� Exhibits C and I also. � TASK 5: Mitigation of Existing or Potential Problems Drainage facilities for the proposed Liberty Grove and Libe�ty Grove Contiguous Plats will be designed using the guidelines within the King County Surface Water Design manual. The development is proposing to install a new detention and water quality facility within the southwest property comer. Due to several recorded downstream drainage probiems, we are proposing to improve some of the downstream facilities as shown in the Conceptual Drainage Plan. The new facilities will be designed per the quidelines within the 1998 King County Surface Water Design Manual. Per discussion with Mr. Bruce Whitaker of King County D.D.E.S, it is our understanding that developments within the basin will be required to provide downstream improvements, in lieu of the Level 3 Ffow Control requirement_ Although we were previously proposing to use the Level 2 Flow Control critena together with downstream improvements, not ali downstream faci{ities are within the R.O.W. and therefore cannot be easily upgraded. Beyond point 30, the ditch begins to disappear. Water then disperses within the private property and then collects in a ditch, then continuous east. Although there have not been any drainage complaints from the property owners, it appears that the drainage facilities within said property will be inadequate to convey flows beyond pre-deveiopment rates. In lieu of upgrading facifities beyond point 30, we are proposing to upgrade the conveyance facilities from the project site to point 24 together with the Leve{ 3 Flow Control criteria. Another alternative is to provide the Level 2 Flow Control criteria and provide adequate conveyance along 160�'Avenue SE down to SE 144�' Street, which will prevent water from entering private property. The ��nd show� in the Conceptuai Drainage Plan, in our esiimation, wiii be abie to accommodate a pond sized per the Level 3 Flow Control criteria. Flows to the existing wetland will be calculated and maintained by allowing some roof and yard runoff to drain directly into the wetland. Runoff from upstream areas, presentfy draining into the wetland will be collected and discharged directly into the wetland. The drainage complaints are induded in Exhibit G. Also included in Exhibit G is a summary of the drainage complaints that relate to this project. Each complaint will be address as foiiows: 1. Complaint Number: 2000-0322 and 1982-0520 Address: 13612 160�'Ave. SE Description: Complaini 2000-0322 was a water quality complaint. Problem could not be identified; therefore the County closed the file. Complaint 1982-0520 was file in 1982 and involves flooding of the property. /o Salution: These comptain#s originated from Parcet B of the project. These problems will be eiiminated by the developmerrt o#the property. 2. Complairtt Mumber. 1989-0867 Address: 13802 160�'Ave. SE Descxip�on: Was not avaiEable. Complainf may be too okl and may already have been addressed. Satution: Tiie County wiii require the flaws to the wetland within I Parcei B to be mairrtained, and there€ore there shouid ', be no afi�ect on this property. ' 3. �omplair� Number. CAR No.9g 004152 and CAR No. 01-005339 Address: 13814 160�'�4ve. SE Description: Camplafrrts indicated that the ditch i�frort of the property has plugged. King county respo�ded by cleaning the ditch. The pr�per#y owner indicated that the d�ch alonc� the west side of 460�'Avenue SE floods. VV�lhhen fiooding oc�curs, water crc�.sses onto�is ProPertY- Sofufion. We are proposing to upgrade the faciiities in #ront ofi this pro�ertx ta Mandte post-devebpment peaK�aws. Tf�e proposed P#a# ofi Evendeit wi11 be improving the west side 160"'Avenue SE, wf�ich wip atso hefp eliminate the probtem. 4_ Complaint Number. 1997-0203, 't997-0423 and C1aim Nos. 3'l249 & 21860 Address: 14028 160�'Ave. SE E?escription: Complaint �997-0423 is not avaitable. Complaints 97-203 and Claim No. ��860 were fil� by the previcrous owner Mr. Marshalt Brenden. Ctaim No. 31249 was fited by the cu�rent owner 1Vlr. Chad IlAyers. Ail the complaints invo(ve faiiure o#the� drairrag� system and flooding o#the property, which includes flooding af the lower level of the house. �tution: Tt3e '�8� pipe in front of#hi� property was recently enlarged #o a 30" ADS pipe, whicF� shoutd be adeqr�ate to c�vey #he flows. !/ 5. Complaint Number: 1997-206 Address: 16046 SE 142"d PL. Description: Off-site flows impacting property_ Property gets � flooded and septic system operation impacted. j Although Drainage Investigation Report does not I indicate any actions were taken at the time of the complaint, it appears that the County has installed an 18-inch diameter pipe behind pipe behind his � property. There is still a problem with erosion downstream from the 18-inch pipe. Solution: This is beyond '/+-mile downstream from the project site. We believe our proposed mitigation will improve � existing conditions. i This level 1 analysis has provided a compfete review of the downstream conditions. ' With implementation of the conveyance, detention and water quality standards, the I' I project should not pose significant negative impacts to the downstream drainage course. � � I !2 - �xr�IB�r ,� i 11 � � 12 i � � Q � � SE 128TH TftEET � I- -�— � - - - - - -r- - - � �'�'„ > � ( i ¢ �, I 1 ; 14Q � > > ` 13 ' � � SE 136TH ST I � � I w � zLIBERTY � I S�� IH.S. � I 1 a i � '- MAPLE�OOD � I .� HEIGHTS � � � ,�`' PA K � � � � 144 T —,— —��,��' a�r+ra+ — — — — — -{- — — � I a � I a �ANO � . 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IGn�Cour��GlS Ce�ter�News E Services�Comments{Search o....:�:w.,,,H„��...�„rr,o,tr.,,.r��n...bh.,anue vn��avnroccN anrPP tn hc M�inr1 hv tarmc anA rnnriitinnc nf thP tite ThP(�P.�i ILS � �XN/BIT G Sr�,r'1 D� r/tSio�J .0�2AInlA�t /NVESTiG�#Tia/Il ��v�cv2M�TlaV r�a�►rra�r ane iar��-er�� cae�uc� �: ,��_�� 1lrN�f►r�1i� Art��f►riel� p�ts iir�s hw � 1974-0095 C RlPF2AP 15225 JONES RD ROCK,SlD�KE/15219 JONES RO/CEDAR RN 657A0 t974-009fi C WPf2AP 15224 JONES RD ROCX/DIi�JJONES RD/CEDAF2 RNER 657qq 19740103 C 15631 JONES RD SE W/O BACKFILLIJONES RD 657A4 1976-0106 C Df2NG 1500� JONES RD DITGFilAIONf�CEDAR 5$7A4 �9T5-0128 C FIDG 16418 SE��STH ST STOFtM SEVVERSBRIAtiWOOD 5 6$7B4 19760084 C 156TH PL SE/JONES RD p/UMGE/1LONG RpJ(',FpHR RIVER ARFA 657A4 19760091 C DEBRI 15163 SE JONES RD CEpAR RIVER G57/W 7 979�0090 C DFtNG 14406 7 62ND AV SE �7g3 �9840117 C DRNC 13405 tSBTH AVE SE g57/� 1981-0316 C 15035 SE JONES RD DIKE JE7TYICEMF2 RIVEf2 657A4 ,/ 1982-0520 C FIDC 13612 160T}t AVE SE 657g2 1962-0527 C FlDG 16426 SE 145TH PL BRIARWOOO AREA 65764 1983-0357 C DRNC 14827 SE JONES RD CFtDI�pVERF10/MADSEFi CRK 657A4 � 1963-0386 C DRNG 15243 SE 732ND ST DRNG DtTCWSE 132ND STM52ND AVE SE 6S7A2 1963-0387 C FIDG 14063 171 ST AVE SE BRIAR1N000 AREA 65763 1984-0224 C FLOG 16211 SE 145TH ST � 657gy �9850710 E FJLL 15035 SE JOt�S RD KG C7Y NOT RESP-WILI�wtENF 657A4 7986-0372 C VIOLATE 15817 SE JONES RO M081LE FiOME M FLOOD PiA1N 657qd 19H6-0372 E ILL DVLT 15817 SE JONES fm TO BALD FOR Ct�A(CNK STAT BY CMDn. 657M 1986-0378 C FLDG t3129 160TH AVE � gLppCED UiTCFI 65762 �986-0437 C CULVERT 75252 SE 7�2NDPl INSTALIATiON-l1EEDC8 6y7A3 1966-0651 C FfLLING 15045 SE JONES RD SEE 86U745,1158 657A4 198607d5 C Flil 15045 SE JONES RD ILIEG/►L FtLL-CEDAR R1VER 657/W 1986-0812 C EROSION t5421 SE JONES RD CEpAR RIVER 657A4 19867158 C FLDG 15059 SE JONES RO SEE Sfr0745 BRAMSLETT 86-0745 65TAd 1987-0430 C TRFD TO SYVI+tiFMVF2D ORNG. 65762 1967-0430 ER OFV5INM pN PLY. 65762 1987-0430 NDA OWSVYM DN P[.Y. 65762 1987-0496 C DRNG 16423 SE 135fH ST SEEPAGE 65782 1987-0`,�89 C SEE 87-0430 WILSON. 65782 1987-0593 C DRNC' 16904 SE 136TH ST DRNG ESh(T WATEF2lDITC}i NEE0.S MAWT 65782 1987-1001 X FILL �6861 SE JONES RD IU.EC,AL FILL IN FLDPLAIN 65784 19H8-0377 C DF2rK' 74250 S6tSTAVE SE FWJ1FtDOUS POND OWfO CA�1.06/t0l89 65763 19H9-00'10 C F!LL 13400 168TH AVE � NEAR DRNG CHNL 65762 1989-0086 C ORNG 7�820 150TH PL SE INSTALIING ORAINAGE 657A4 1989-0863 C DRNG 13224 1b8TN AVE SE DfTpi CL£ANINGJlO51NG YARO 65/B2 � '1969-0867 CL DRNG 73802 160TH AVE � CLtt12735 DUE APRIL 657H2 Page t d 4 , . O � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � M � � � � � M , � � � ~ � '' a � 5 � � + � � w � � � � � � � V � � � � � � Q b � � � � ` � � � � � � � � � � & ° N r y � � � � � � � � � LL � � � � � � ° � a � g� o � � � � o � " � � � � � .� µ� �{ � � � y� � � � � �S �S � � < � � � � � � O � �' o Q a .. � � � � � � � � � � � � $ � � � � � � � o � ; � � � � � o � o � � � � � � � � � � � � � µ�{ . , , � � a p �, ti a � , � D � 0 � 3 � � � � � � � � � 3 � � � d � � � 3' � � � cn � 3 � � � � �f l� !� N N N N N N N N N I� w w � � � � � � � � � � � � � � � � � � � � � a � � � � ay < a � � � � . � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � s � � �. � � � � � � � � .. � � .� r � i �� N N t� N N N N N N N N N N �A N N N �A N N !� N t� !� U1 N N t� I �'i re � � �P ao � i. i. r. i. o 0 . � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � '� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Q � �� ui� � d � �S � d � uw � � � u � � � � u �iuw � u � � � � u � � w � � � w � u � � � � � � � � � ss � � � � � � � � � � � � � � � � 4 � � � � � � � ~ � � � � r � � � � � � � e� �� a r r r r r r �- r r r � r r r r �- r r r � r .+ � � � � r '- � t• � � � � � � r � . i � � i M■rrr Ltii ill�d htY�■ A�rst�f R�Yw Crtt �a� � 1993-0724 C FLDG 13516 164TH AVE � FLOpDRJG 657gy 1993-0724 RN FLDG 13516 164TH AVE � FIOODING iN WETLAND ON PROP£RTY 65762 1�su7a� Jri�. vvMribw� i o0o i x .ii�lES rZC. g$7gt 1993-0752 WpE DIJMPWG 16861 SE JONES RO SEDIIiAENT FROM YVELL DRIWNG 65784 I1993-1063 C FIOLE 16519 SE 149TH ST FfOLE IN ROAD SI-tOULDER 65764 1994-032fi C i)FiNG 13200 156TH AVEY RD � NEW UPSTREMA CONSTRUCTION-WILL 657/12 1994-0538 C t1AZ/1RD 16519 SE 749TH ST NEW KC DfTCH W YARD lS A FIAZARD 65764 I 1990-1011 C DRNG SE 132ND a 156TH A � DtRECT DtSCl1ARGE FROM PIAT OEVELO 657A2 19950107 C CULVERT? 15641 SE 138TH PL PpS3lB(_E GROUNDYVATER IMPACT TO S 65763 19950715 C RUNOFF �64XX SE 73S17i ST ROAD CUIVERT DtSCNAF2GE HtST DRNG 65762 19950907 C DF2AlNAGE 13100 166TH AVE � Lqp(OF CONVEYANCE W UNOPENED R! 65762 1995-09d7 R ORAINAGE 13100 164TH AVE $� Wq(pF COP1VEYqNCE W UNppETfEp W 657g2 19951070 C CREEK 159i5 SE 1487Fi ST STREAM FIOW iNFO REOUEST 65784 1996-0039 C DRNG 15609 SE 128TH ST NO INFORMATlON AVAILABLE 657g2 1996-0289 C FLDG 15225 162ND AVE g GRpUNDWATER STREMA IMPAGT PVT PR 65764 19960289 R F�pG 15225 162ND AVE � GF20UNpWATER S7REl1M lMPACT PYT PR 65784 t9960376 CU SEEPAGE 15225 162ND AVE � $EE g6-p289(fUP g5764 1996-0556 C RUMOFF 1Q301 166TH PL � qppqRENT GRpt1NpWATER SUFtFACING 65783 1996-0556 R RUNOFF 14301 166TH PL SE APPARENT Gi2011fV01NATER SURFACING 65763 1996-0869 C FLDG 15035 SE JONES RD HIGH FLOW PONDING PVT PROP NO OEIi 657q4 7996-0869 NDA FtDG 15035 SE JOI�S RO HIGH ROW PONDING PVT PROP NO OUT 657M . 1996-0869 R FLDG 15035 SE JONES RD HIGH FLOW PONDING PVT PROP NO OUi 657M 19960870 C R/D POND 15XXX SE 143RD ST }(1ps USI(Vr,PONp FpR ptRT BII�S 657A3 1996t050 C1 FLDG 7507Q 1567H PL SE REp�ASURSMEN�FOR CLEAN UP VWORIC W 657A4 �99Cr�253 C DRNG/PIP 15226 162ND AVE SE PVT DRNG INSTALLATIOf�!IIiAPACT ROAD? 65781 1996-t253 NOA ORNG/PIP 15226 1G1ND AVE SE ��G��TALLATION IMPACT f20AD? 65784 1996-1253 R DRNG/PIP 15226 162fJD AVE � PVT DitNG lNSTALlATION IMPACT ROAD? 657Bq 199f>1557 WQA CONSULT 132U3 156TH AVE $E B(,'W StTE COhtS11LTAT10N 657/12 1996-1724 C FLDG 14206 164TH AVE $E pFF$fTE FLpW IMPACTING PVT PROP 65783 19961762 C FLDG t5059 SE JONES {Zp DMMGE TO DRNG OUTFALL TO CEOAR R 657A6 �997-0056 C DRGi 13215 156TH AVE � 657q2 1997-00�,�6 R DfTCN 13215 154TH AVE � 657A2 �/ 7997-0203 C FLDG 14028 760TH AVE � OVERFLOW FROM D/W CULV IMPACT PVC 65763 �' 1997-0206 G FIDG 16046 SE 142ND Pl OFFSfTE FLOW 6rIPACTING PRNATE AF20 65783 �/ 1997-0206 NDA FLDG 16046 SE 142ND Pt_ OFFSITE FiOW IbtPACTING PRNATE PRO 65783 � 1997-0206 R FLDG 16046 SE 742N0 P� OFFS(7E FiOW IMPACTING PRIVATE PRO 65763 1997-0318 CL CWM 14038 567H AVE SE FLOODWG DUE TO RUGGED CULVERT 657A3 h�/�� 1997-(M23 CL FLDG 14028 160TH AVE � ROApSIDE DffCH OVERFLOW-160TH AVE 65783 �997-0484 C DRAINAGE 15701 �138TH PL SE ��7Y DEV CONCEfiNS PVT DRN(' 657A3 �997-0524 C EROSION 14631 156TH AVE SE NATURAL SUDE AREA AD,IACENT TO PIP 657Ad P'ege3d4 O � � � � � � � � � � � � � � � � � � � � � � � � N � � � r � � � � �� . � � � � 0 3 � . $ � � o � � � � � � � � � � �n N � z � � + � � � � g � � o � } � � � � � � � � � �� ag � � Q � � � J Fs � . � � O � � � � � � � � i . o � � � � � � � � � � � � � � � o � o � � � � � � N � ; � � �y� � ~ � � � �LL71 , o (?�. 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E£ _s 6£ _ � -- - - -- -----: - - - . - - S - � � - , _ .-_ __ - . - � � - � - - -- ` � : �a „ . - ,.,, - � - _ . . , : ,-.� DRAIN�4GE COMPU�iNTS SEiMMARY: 1. Cvmptaint Number. 200D-b322 and 1982-0520 Address: 43612 160�'Ave. SE D�escription. �omplaint 20E30-Q322 was a wafer quality cor�plain�. Problem could not be identified; fherefore t#ie County dosed tk�e file. CompFain# 1982-0520 was file in 1982 and involve� �ooding o#the property. 2. Gomplairrt Number. 9989-0867 Addre�s: 13802 '!60'�Ave. �E Description: 1lVas not a�ra�lab#e. Compfaint r�ay be t�vld and rr�ay airead�r have been addressed. 3. Complairrt Nurr�ber: C�R No. 99-004152 and CAR Mo. 01-005339 Address: �fi3814 �60”'Ave. SE Qescription: Comptaints indicate�l that the ditch rn #ror�t of the P+�t��h�s plugged. King oounty responded by etearing �he di#ch. Tt�property owner indicaied itiat j , the ditch atong the west side of 160�' Avenue SE � ' r�oods. VrPne� fiooaing �rs, wat�r crosses onto his i ��Y- a_ rcxn{�laint Niuutnber: �997-D203, 1997-0423 and Claim Nc�s. 3'#249 8� 21860 Addt'ess: 1�40�8 �tfi0�'�. SE De�crip#i�n: �omp#aint �g97=0423 �s not available. Compk�aint� 9�-203 and C(aim No. 2'l860 were filed by the �evic�t�s owrrtes'Ntr. J�llarshall Brenden. Claim Na. 31249 was f�led by the current a+nmer Mr_ Chad t�lyers. AI1 the compiair3#s invotve#ai�ure o##F�e drainage sys#er� and fil�ooding of t�e property, which includes#looding o#the #c�reFr levei of#he house. Probtem-appeacs to�ave been resolved by installataon of 30" culvert in place a#the 18" culvert. � I :., . ., : , ;.... . r 5. Complaint Number. 1997-206 AddreSS: 16046 SE 142"d PL. Description: Off-site flows impacting property. Property gets flooded and septic system operation impacted. Although Drainage Investigation Report does not indicate any actions were taken at the time of the complaint, it appears that the County has installed an 18-inch diameter pipe behind pipe behind his property. There is still a problem with erosion downstream from the 18-inch pipe. � � ,I . i 0 JAN.24.2003 4�15PM KC WLRD �`�.ccc r.c�o � �ING+�A�N'�'Y'OVATER ANA LAND�ESO[TRCFS DIVISION - � D1�L'�l.l�\AV� �LL�I Y�iJ'CIGAT�4N REPOR.T .. � ' . .�i,�•,��,. I` ,��,.� � , . � 1: '`�< ��,; �..r,,+} ••_ ' .• .��f . ITNESTTGAT[ON R�QUEST � 'Y'�rpc .C!J(�/�.; rlC08L�1�'i� ,` C�� ' � . �.' �'.r:� �'� 1 , CBIVED BY' ' �' D :� � �K'd bv: �� •1 0��..r��S'' '.`� ' E�V_ Received'from�(��'.e��1' �Q6-97y3 � � � � � � � �� : . � ;'�. Ou ' � � � - - , (�aY) �� . C�ve? , �_��"� N�rE: ��Q.��, , ,Vl � - Pxor� � _ : : . '`t' : , J � y' - ADDRESS: "�c��n� /�((L"11,�_Sll,�,� ��_,_City ��'� State ' Zip."�d_� , . ' LoenT�oN oF PRos�M,�p�xErrr: . . . . . . . � : . .�,_ • • - � � • . � Access'Permissi n Grarrted � Call 1�'irst (would Like To Be Pr�nt ' ' ` ��- �• �� r-r 1g.,08+ ��F1'►'1 � : � � - � ' � �' . � � ��• � ' ' •� '. - � "��,y��; � , ��duo ,��o .. . � .�� '� . �-��rr � . � � �. � , . . . . , . � r� �'��'. � - � � -x��' . . � � , ��'-�, �,i?� � ��,`��o .� ` �`' . ; :. '��" � �,��[_.,�z ' ��:17 �a�i� . . . .� � � � �,�� : . 1,� .� �- . . � ,�� , �-��' . - . , . � � � � . � . � � .� . � � . � � . . .. . .� , � � . . . � � - Plat nat�te: �"�p(p�� ,�r T-�p,� Lot No: l Block No;� Other agencies involved: • � No field investigation rcquited `� h��+�Jh 1' , - �.'Iw Y'' Y� � �� i�d s �r - R � p��vo, /�15��"'l,G��'��ou �'IJ - �.s�s: rr�+► ��1 2— 1. � . . . . . . . � . - Bas3u �� , Council Disfirict�_ . Charge No. � RF.SPoNs�: Citizen notified on �'�� lo:0�/�w� �by: _ Y phone letter in person . ��'� 5+�� '��'��L�� -�t,w,� ,�"��i�� ;� � C..�,� . .�?' _ 9-00 lo:o��!�t� - . . , . � '� =��:�-�F'. �� -��.�►� a��e. � �.,� � ' �,� �,,.#,� _ s��s�� ..�n�s��t G •� P�-� � N�`S C.a��e N�'`f �f p� ' � T� t�l : �'�h'�' DIs�POS�irrl[ rr: � 'I uvsn-ed to.•��' � y�_'_ QR No�h��'�� ,';._. '•^ � e�r action t�ccommended because:�,.�' ;�,.i:� � . � . . - � . . • - , ;L�:-f�;..�;�• ;,.'s�. � Lca�d agency hss bcen notified: � � . .• � '' . . � �,� Probleni h�s been wrre�ted �� No problem�has b�n identified :� Prio��in�tigatio�addrosseb pfoblem:� , �:, , �,,. � . . . � � . , .:. , ._�., , �. � � . .� , �' .•SEEFA,�#.-, .�•.,, � .', ` '�� , • � , . priyat�pcob[em-N1�AP vh'�l not cons}de�bec��se: . . • �., :%•'-�� . -`='' ; " 4'.. .' ' �, .��.-`�. . • . - � • � ` ' � � Water originates oasite and/or on�eigh�horing parcel.�• : �.r: ',,: .. �- . '.. . • . ,. . � , �_,_,LoGation is ou�ide WLRD Ara�. . � •. , . ' ,�Qthtr(Speoify), i �,- - :� :� '� - •, DATE CLOSED: � �/� C/ '4 O.� gy; , , � , . �'� � . Y, - !s.+•�,� . '�•', ' ��:� .'•. - '. ,� • �" ;,1 ,:.;.�,�:.� . � ' ' .. � . , . , . • . , . . . ,;, . - '�. �';�1,1 ,�� - _� •. ` � ' �o.v�ec��l��r- � - .�, : ..Y,. �_ ,, ,,...�-��- - � �Ir�la� s:�ah� '. � �: - _ � , .. - .. . =-.�.....�:::_.. . _ .�,.- . . . ..�.. �ro�.cv.ceir�.� �+•tari•i ni, w�w �,v.�� ..� .� Complaint No. 00—0322 Name� 7eff Kttchel [nvestigated by: Virgil pacampara • Date: May 16, 0000 . DETAILS OF INVESTCGATION: I met with Mr.Craig Geller (rosident) ac 2:30 PM:regarding a water cjuality complaint. He ipformed me that fie has no idea where the pipe has originated, its source of flow and notice the discharge two mot�ths ago. He been living in that house fer sev�n months only. The subject of complairRs a 6"dia., white coloreci PVC pipe discharging an orange colored liquid. The exposed end-part{out fall) of pipe line is located fu side ditch of 160tf� Ave. SE. ap�rox. 40 feet North from the 8W coruer of thc property. Using the end of pipe as reference point (refer to photo# 1,2,3). It seems it was been [aid laterally at an angle towards the house in narth-�asterly diroction and buried in varying depth of 1'to 2' feet. At time of visit, 1 took a water sample fi-om out fail(end of pipe). It is discharging clear/colorless liquid(refer to photo#5,6). Noted a consta�►t flow of dischatge in the whole dvratian of visit. Stained area is stilt visble(refer to photo#4,S,7), No �ace of recent back fi(1/ excavations along d�e probable route of PVC pipe due to presence of'debris aad yard waste scatrered all over the properry. Notice the south side of the small garage, a stock pile of usod/remnants of varyina size of PVC pipe including an identicsl :,ize and colar of pipe mentioned in the complaint(he informed me that it was materials u9e a� his othei• work as a plumber). Checked water meter for possible leak in waber supply of the house, (noted water meter gage is not running despite a cor�siant discharge of liquid/water in out fall). He added t4�at a septic tank is serving his sewerage syskem and a drain field loeated at backyard. The roof downspout is not connecced to any storm drain pipe, will create a surface run off in the area (refer to photo:�8). 'Water sample taken from the pipe reveals Category #a; variety of isoa-relaced bacteria and Cabegory#S; Iron-related bseteria plus anaerobic&aerobic slima- forming bacteria. � ;� P �� `�J�d� T� ��P � 16" dia. r— ,_. � � �..._ _,r .._ _ _ _� _. ._ ._ _ _.I drainage pipe � f (buried) � P�PP� � �� I DVolberg #IGOU9 � #tti01 I #1602] � Property line � � � � � � r - -j -�- i �� ariveway _`- I � #13612 brain field 1 watu :' � � oia �a�a� ! meter � ' •' I .• ,4, : Old trailer .'�' debris , Stock pile ofpipes � I �.� (used J remnaeu) � ditch �+7 Garage �u� � � ( . � Out fall/ h�3 ' � ——-- — — �-�– � —— � ..._ _ _ _... J End of�ine . I Property line ! � Probable route cf Staioed ° I 6"dia.PVC pip�� area � � L� — JHIY.�`j.�I�?:3 1��1�1-'f'I KC. WLKll 1'IV.JJ7 r.ic.-� 1J �—� � �� ....r�. _ 1�� DEPARTMEMT OF PUSLIC WORKS K o��sioN o- � tOMPLAINT lNVESTIGATIQN REPORT �� DATE- �S �d� � ' NATURE OF COMP�AINT: �LO d d/N(� Complainr Rec d / r aod�o p c�� p LOCATION: ��6 �2. ' !f�� A�E �G Phone On•view ❑ COMPLAINANT: �Q KN ��h�C� ADDRESS 13.6 l Z - l�o �u� S� PHONE: 7 7 Z�(a��C Detoils of Complaint: �-{�. �7Ec�/ARr S PRD�ERTy 3E�,v� �cpo�E�. Jok�u �Kov�,e Atie �iG` M��17L �A�/C 7vL�j H/•�t Tv C.�GG SG(�/�• �iCJ/ld T G'A.0 BC D oirJ C � Complaint Reteived By: /c7.r� �� . Comploint Referred To:– �QE�E� ��AZ/ER Z �rE�' 8'� Dote; The S�tewar� propertq is natura].�.q law,lping appros. 4 feet be7.oW the ACTION TAKEN: Sl1TP011lldiIIg p�Opel`ty vhich is Coun�y xoad, and other pr�.vate propert�, 'he road and ��s culverts have been in e�istence for ��.1 bepoad 7 years. I 3on' 'eel we should do any work,e$pend�.ng publlc funds to 3mprove private propertp. tr. Stewart could install a French drain,co].lec�t any Water tbat enters his pro��eri :nd dxscharge �rom the fxenc$ dra,in into the roadside ditch�t along 160th AYE.S.�. 'he discb�arge wou�d have to be Contro7.3.ed so that it was ao� much more than a tric ,n order �o assure that the d��tch can ha8d�e it, and that we algo do not create az �roblems elsewhEre. gtewa.�t told me he aats County to channe� the dtaxnag� alo Compla�nont od�ised of Action passible e : Phone � i_errer � Personol Contoc� ❑ x -�,�(�� he roads and not onto � �.y qy.} o��,� �y, �/; Camplainr Action Hondled By �' �SL�.—�dr.a( rei {-��1 cu� ta s shoW NBtural dx�airiag e ►'u"' �"TE �+s,�r'� tf�+a�' `�r%s i .c�oss his property.Established dr xDage. cr �r;,,Q� �rol�les.� . RETAIN PINK CA�tBON: END YELLpW AND WHIT OR RD_�W�,�,tC� rtYLe G�N��' G��f/� �� 1'lOt �kG G G'F►�'f. G w �los�,g -f�.�s Ir�w- ' / , � � � �r � � JAN.29.2003 1 Z� 10PM KC I�RD N0.339 F'.1�1:� � ' - - � � 6 0 A V S �4v� - I E SKdJ�DE/1 _ � — — — � � ,_ 1 OPEN DITCH -�-- - = O.DTTCS 6 2 �i �.E. 136th Street �� ' A i r � � � � OPEN � � g � DITCH ' I E ! OPEN ].3612 DITCH� �L__ � 1 ii ,:_ _ ____ a STEW,�RT � ;' p��8� � . � : , � �tl/LL/LUV! VI _:JJ 1'�n c.i.. �o.. ..�..v _... _`.� .." '_"'___ . . . . _ ._. ._--.__ t,Ci�g C�ount�t Depardnent of Transpo�tatiQn Request N 99-�Oaj 52 Request DaLe_ 1 9 Citizen Actian Req�est Form RequestTrne: 9�0 Request taken Ha: P (P)hone (R�dio (0)n-View (�ax By_ MCDONALD Catler Name: BOWDEN, BRET Day Phone: (425)255-6152 Other_ L Ca11er Address: 160 AV SE 1�13814 PAQGEG n�0. /�575c�(� 3� � g� l b� r''�.^.�.�. Location_ 160 AV SE�13814 q$a�$ Request Detais: CLEAN DITGH Requesi forvrarded to= PU 004 DN: 4 Dispatched to_ Time RePd: /lbove tlis�w ior OffiCe USe Beforr ttds Yre Tor Fisld Use tr»itial Investigation by: CAMPBELL Req.Type: D Investigation Date= 10f05J1999 Findings Action Taken_ SLOPE MOWED Task Completed: 262 Referd to_ RPU or Work SclYeduFed: / Responding Pit SUMMIT Date RePs: Seco�d Investigatio�by: Date Rec�d_ Action Taken: Task Completed_ Requesi Type: Date�bsed: 08l23I2p00 Contact Log: I 10/6I9g pM CONTACTED CffQEN I .� . • " ' � CaNer contacted by_ t {P)Pfione (1)fn persan (N)Nate or:etter (U)Unable to contact Type of Request Choices A Vph'de G.Guard�IFenoe Dam�qe M_Itegal Use d RIW 5.Sh�eet R�tainJSwee{� B-lM�df►�pec�o� H.Sp�f�e�rxiP(C,�a� N.Shautd�a Main4az+anoe T_Trasl�ILCler on R/W C.Cmha�Ouerla�t issues I.k►qui�ies RE:Maint Aciv�es O_Misc.Requesls U.SnowAoe D-t�age J.SpTay Appl�Oon P_Poltwle V.Wa�on RoadlFlooding E.Debris on Ro�ad�ray K Washout ReparlSide Removal Q.Sid�e�ACurb IulainL W.Lid alissmg(C1B 1191-) F-fiood�ns P�*ey �.ve�renon co.�,d iMar.B►ush.e1c.) R-Repe's StieetJPavin9 x-ot�►� Y.8ridge tsu�s \J _ __ �f K{� Cctunty Oepart�me�t of Tra�nsport�tion Request N 01-0�5339 Request Date: Citizen Action Reguest Form RequestTsme: 1633 Request taken via_ p (P)hone (R�dio (OM-view (�ax By_ GALLARDO Galler Name: �OWpEN,�RET Day Phone_ (425)T93-7783 Other. CallerAddress: 160 AV$E�13814 P.4�2CE[ No, /`fS75GbO�jG tocation: 160 AV SE�t 3814 Request Detads: DRAINAGE DtTCH PLUGGED Request forwarded to: PU 004 DN: 4 Dispabched to.;RONIN Time Ref'd1633 Above tl�s ine for o16ce UsQ aQlow n�s Ikw rw F'wid use trtitiai Investigation by_ C120NfN Req.Type: � Investgation Date: 12l932�Ot Findings Action Taken_ VACTORED�FLUSHED SYSTEM Task Completed_ 241 Reiei d to: RPU or Work Scheduled: 1 Responding PR: SUMMIT Date RePs: Second Investigation by. Date Rec�fd_ Action Taken_ Task Completed: Request Type: Date Closeci: 42/14/2001 Contact Log: � Caller contacted by_ U (Pj Phone (q tr�person {N)Note or letter (U�Umable tn cAntact Type of Request Cho�es A Vehide G_Cwardrad�Fence Demage M_fkqal Use af RNY S_Sdeet 11+tain-/SweeD B-tlbTdr kxPe�io^ H-Spi C+earx+P(G�e�al) Hi S►wuaer Ma�neenancR T_Tr�shlLiqer on ww C.Contr'a�ilOverfay� I.Y�quiries RE:IlAarnt Attivipes O_UA7sc_Requests U.S�wwJlce Q-� �-SP�aPD�'ation P.Paftnle , V,Waier on RoadlFboding E.DeCris d1 Roadwey K_WasAo1R RepairlSSde Removal Q Side+weicFCurb 111ani W_Lid Missing(C/B U�) F.Floodrig Ptopettq L VegelaEion Cadrd(�Oow,Srush,e�) R.Re�SUeetlPar'vg X.D'4ching Y.Bridge Issues 3► JHY.L4.CUYJ.3 4•1Jr'I'1 Kl. WLKL "v•"-'- ' •"' " '��.. . • . .. . . ..�� ' � � ' � -. KING COUMY SURFACE WATER MA[�IAGEMErff D1ViSiGN �''--y`-r _ _ "9 , �� ' - ��- - _ ]�RA�TAGE IN"�ES'Z'IGA.TION REP��2T �� - - Page t: 1NVESYiGATlON"REQU�ST 'fypa �� .Recetved by. � Date: l� OfCd 6y. Fila•N0. 9��(/� - Recsived from: • �teass pri pleln for scannfn�). . � (Dsy) (E+e) r�u�: � P�oN�=�� v� �� ADDRESS• / fJ (/ � -7 �/�� Q�.�t''� C�Y Staia Zlp_1��.SG! � . , . � . Locatlon af problom� tf differer� ' ' �' . Reported Probfem: ' ' ' y`' ' ' . . �'G. �'� � : �� - ' , , � ��.U�� `�2�� c� � � � ��2/.� G�'2� ��.Uo �'�� . � � � � � � �..�� :�. �" � �� . C��j��,�'�-0 �.�7 �� . , �.�/ , �.�r-f�� ` , � � �� ' /f?' 9� Ca!� �'.�-� � �� . �.��7�I . ._ _ �.�-,--�- ,�--r- . �� __..___._.. _ . _ - . , Plat-name: � eqour f�r� C� U�rY r�,s f.s�iNa ..S^ BfockNo_ 3 O�er agencies t�votv�: No F1eld Investtgatien Needed � � � pn1SSals) �;c�'�F� � �" 1Fyi��ir'Ak :..�� '� ��!l� r f � '8F3r:�. ;�3k � � �. ¢ . �� Parcet No. 1�;�7S6--oiC��` to-ol! U� 7h.Bros: New �� 1f4 S T R � � ' ' � Old �� B3S�R �C� Councp Dlst �� Ctk«gA No: • ,_ RESPONSE; Citizsn natified on 3-I d��' by �L phvne letier �In person � ��e�u� . �.I�-�:,.-:..�cs.. ,�,.,� � � ,� ,�,,a.a:�� .��.� �.�� - � . ,��, .,�� ..��.�.. -i� r.,.�� o-�� .-�.�:ti�- Q�;��-� �'� �..�.� �-�4� l.�0�'�4,-� -al�:� `��ij . s�-o� .lo.(.u�{ . � reTQe�11.C.c z'fN-�Ca t�.� ,,,,,,,..,.;e.^��.r�.. Pr'� �-a.0�-'`-_ �� P �`�-"��5., � � - � �� '��l.rf�..�. . Dl.SPpSlT�ON; Tumed to 'bn • Ety OR: No further actton recommended beca� Lead agency has been not'�ied: . � � � • _ Probferrt hzs been cotrecced. �No problem has been Edertti�ed. Prior irnrestEgai�on addresses proble , ' —Ses Fife f Priwate probJem-NDAP will no� conslder because: � �Water originates orisite and/or on neight►oring parcei � ,�Locatlonrls outside S1NhA Servi 'Ar�,a . ,;�Other(SpecIfy): • DATE CLOSED:� f � /� by. , � � v��g JAN.24.2003' 4�16PM KC WLRD' � ' ivv.ccc r..,��, �'�.t'. . � ,w.�r' '�'n' — -- h�.—��"�. , -- � - . ► � '��,�,�;+ � > , ,i . � �C-"iCf'_'C'7 A��J�2�� i'TVL�O'?�,• °.t-�I'•I� � .i . .` ,'r. �mestigaced by;r�an cnoom,'oa►�1 � � • , . . : i;;�� . , , _ . 1v�s�au srcnaon bwlt bis i�,'dena�ocamd ad�abav�:�t;��n�oea adaress u�1�2. "rb�s is�e Sr�c�an a� flooding in tpe hausq�xpa�icnc�si�cc bo moti�cd in,howGvcr,nr1'crcua Fjle No. 97 20C fos hi�torlc IIooding ia #he n�ighborhood:;Tbc draiaa�ditch boz�aily in the pas�ye�s�nd1Cd�s�ifaa watar IIo�v t�uring storm ev�ent�,Bren�°n s�d.`�'hc gara�i q►traace of Bnndon's bome is aliglaty bela�'�qii�ont�raiAago ditc�►,bot�ora elevation. T�eiG i�a storm�rain'�d��?a�t to tb.e garago enu�an,ce that is soinp�s oven'vhtlmed b�,►,t�g,sui'face wate=flow but tau,s u i�o�fust tiitEp the bp�cme�t flQot»vaa flo�3ed '�'ha o�Setl d1tr�mimodiat�yu��c of" Brendon's dVv�lling i��cavily' � ,yqge�tcd which�duce�volume. Also,the flqw�8��e,a�ated bY comb�ni�ig both �des o�160`�Ayc SF.,'�pcffar,c�ia homc. �rondon wants pocential�oodin�o��us'.$aragc and ba�nt to ix �� climiiiatcd. T6c ftequdu,y od�f+ef t�nn�ag down his dri�ve to�d his gar��e a�td 1�ement is high but thc stor�n drain`�j�ceat i+o�t�e ddv�C is leae�t+aqwsttly overwhelrtted,Brendon said. ,�`� '� � � ' ' , . � ` �� ' . , ., .. , i � 'M � � . � ' , ' i' . � ' ,.f.!'. ' . � + + • �6�� V�". 5.�. ' =,: ; ' ..,: . . ' o . • . - - � . - . ..;., ., , ' . . .....�' , - � � , � :i .. . , ,-. � i _ ' : - .� , . 'i . �� . t��ve:rt i�let area reduc�d by '' sedim��nt an gravel build=u� � _. . - � , . � , ,. . . ,� �, . � ,. . . . � ; , , Storm d�ain ' � � .? � -- ,� � � ., , . � 140 8� f., � , ,:_� � ,. •� � � � i ,� }, � • • I , _.....�.._ ,_. ... . , � . � . 5 ' . . __ , , .., ,.„ .„ . ........... �------ - � i . -� -- �- ,-,. . ............ .. . ..... . .....�• . _..... .. `� .-•-• ' S��ding Water i _ � ��._ .. •��;iuf�ace Watez Ais�har�es '� i : ; , t� G�en,Lanr�' , � � : _.. ... ...... . .. . . , � .................... .._... -•- _ �--. ------------------ --�' ' , __ � 33 . -� �- , . � - JI"III.G4.GYJYJJ '+•LOf I'1 1\L. V'1LICL �'v•�� ••• •-� � '__"" �.� .. � ,��•...,,...._.. �'•"'....., \ �\ ��in County - � . � - - - \\� Sur�ace Waler '', ProJect ��• � I � anagement , � �.� ,��,,,, , Eueryone liyes dow�stream C� P _ �hk Rev . �ngineenng&Environmer�l Servicea pat _ Date Date Page of Pages � — � 1��1�1�.1�-.9�'—�¢ . t . ` k � � . , , � , ,' f 'i 1 , � i � • � f @ ��yc"'�' . � � , f !� , ��,.,�,E� (.�9Z ti a � � � � , ` � , � , E � � ; � � r E t � ' ` �. . , � � � ! � , � �) � r � N j . , � , � � �� .,� !' t.,;�.� �,�;�� . �O i� 1- �,� � � - //.,.�1 /(��n�p�- ., 'u-�-� L�,�� . ` . � �' ,� � ��~�;�_ � � � `� . � � l ' `' � � � � i , , .� � _ _ �. � � , - �- � - ` �' ' `��rcr Ty,�c� .�� , - \ SWM-EnyWorkSt,eet a22�9a � � � �' ' - _ -- :, ...:.._.:. ... :...:.:.:::�:-.,..._. . � .. . . . -... . f ;i , . ; ; ' '- K1NG COUNTY,WASHINGTON ; a • � - CLA1M FOR DAMAGES Cj.AIM 2,�-g s � � •''• NO71C�: ��;c das;�ages caZ�e�.�,aid by'rEing Ccu�ty u�tzss a ci�im ccmp�ying with�"Jashinyian Stat2 La�::s �; preser�fed t:, fhe Kin� Coun;y Co��c:i. A�er fifmg �taEm, piease direct ali w*uestior,s to the C�;i"ire cf :=cisk ifHslz.^�C��e:�i�t,(206)296-7�332. � " INSTRUC710NS: 1�Gmal2:e for,�, givir.g spzci;`;c de a�3s about yc�z dar:�age cr loss. lnclui2�ates, ?imes ti ana vr�;;�sses_ 2}Sigr�and have U'�e torm natarized_ 3)Return iorm ta Kirg Coun;y.Cler�c`.he Ccurx:�, E?�.;m � aG3, Kir�Coi:�.,Ccurt�use, Seat�z,WA, 981�4. t . �/f J �1Q, � ` ;NA�� 'Yl4i'f/!ff/� �: �r.PN P�✓� : 3 , � ;=rst,m�.�fdte, :ast a bijs�^.ess name) ; i �aoaR�ss f�� l�d'—�.9J. S� �. -- �,��a--,rlrr� ��os p � ; � 4homp cr c�.:s;z2ss; inctude city,staro andz.p ` � ! � �ausi�:� s NOM� ' �EssAc� _ ! ; =Hon��c�'��7�}'P�/ �`►�on�:��'��t7Z��2! �rvt: ; ; i � � ia��ss s�x uor�t F�;s�=roRE � i # i��SS/ACCIrJE^fs ` �OCC�RRE�. /�� Z� .�-- /�A S r ��(/ 3 ` !ncluds c.Ty,smta and z1p i s . - � � � _� � i�a,;�c�ac,a�rv�r "�-�`� p� �i�n�o��xioErt�8-�d •n►-AMoc��CLAIR!�D��f��--' + '/ p �(//� � � ; �LC�ATI.^��: LOJSiE'iCC1v�NT �7 O ZO ��O J-� �I�.fJ�� • t . ! : �i.'�E�CRi:-^'t(�'d C'�'��+t�"+ILS(D�cr`�oe hrnv��tosshnc'ide.�t#oc.,^ure�j: ' = � � ;�_��C�QCh.+e e a.L � '. ' i � f � 7C � : i � - ---- - -- - - ".,�.-._ — �-- �-�^ - � , KING CrJU�tiY'S tn!VC�V=h4Eh�(.r poss�b�,identify ti;e er.:p�y�or departmer�t irn�ii�eC: = � �ir.��i;' �1 �c�.c►ev� ,B � -+n �R? -1 �. �_ �� N TTI � � r� — C7 . VJtTt��SSES (P,eas�3ve ph�,ane n�:mters and ac�dr�sses). `'� ' } h �} , Q a S. E.� c.✓ o Gl ZzG- �P/� �3 '�✓ / —Ari'C s£ � ~ a fto – -,'P�'t � �) �_ � r,t/" ./ i S � !D ° S €�RO?ER EY�a+saG��lease cescnoe the value ar�d ex;en!of c�a�ac�e to your home, autom:.�bE�,cr � �?��tza:�ro;,�r;y. �ttar.h es'�iirctes,bilis a w`��tever eGcumentation c`da,�ages you rn�� : �nave)- � 1._ Acrf�-�.,s�.r< <" ' . —-- '- . F .4 s C tN 4t.� _ KJ� , t V .wc./ . :'t . i 711�`I^�• r�t..-v c•r�'f8 I'?;'5��, '-�3�.f'?SB Q�SGrIf?6 11l fU��: _ i @ � r-� Al}rA/c_ c�N rc dT rr�� t 1 � � �ic8nf:ty p�,rsici2nfs)cr ar,y c+?�er medical protessior�a:(s)invcivec: � � . : , �; . � � � ;n^E Vv�SC,ii f@��/i^C f�t�diCal tte3tiTlBft'.?:- -�--I . i cv�wa;;t;{S 45 d!fL:B ' � a�tc 2ccur�!�$,�!�rier�' ig .afu e of Claimanf £ 3 =e�'• SUS�RIBED�thD S�UORN j0 ME�li�S ��-tiL�D�Y t�F � f'^ � ¢� �. � � ` / '' � '�+tir�i z Notary c�and t o!Wast�ton r �s�� '`'._ , � . � 35 � ,:�,�.--��-:-_.� �. _ - _ _:- . ... _ _ -_ . `-":-...:-z---� _ ---t-r-,�-�..- '. -- - �.,�:: .. ,. .._ .. �..._��..� ,t t � �� - Brenden�1aim ? �1it�.hn�ent C � JanuarSr l 8, i991 . � � • i . r . >� � PR{JFF'�tTY UAhi�GE _ <:� ' 35.0(� 1-�air�ryer '� 95-40 vacuu€:�eleaner ` J�O.flU (:arpct�nd p�ti I SU.04 Tten�oval .`,-�� 600.00 I�ell Hvuse -' 4�.(10 Uoe�•ct ??5.p0 t,a��,�NuiEendos 100.U0 Stereo caoiner 4 $Q6_Cd`i klideabert i 75(1.(;U Cottc4 _a0.00 Rectiner ;� 2�0_Ufi St�rco s,ne.�,kers �y 246.OU roffcz tsblc t 75.c�0 Pic;n�re frames _ l SS.CO 11'icker chair � 4jD:�4 thr�e s#eers a# 1��J.GC`ezch IDO.Od Kug.:)e<u�zr-rer��C ' SO_(3() Rug f:�n rental-5 d��'s `" S5,]4S_Q();Tota1 Casts _� RFhe t��ta!a�ro+.sni �u�s not ir�cl�de hidde�2 cf�ar¢es such as m ilde�t er w�ter ciama�e3 ta the walls�r :g if1SU��t it)n. `� � i � # - � . f {F } ; . � .. . ' . � . .. O ..�t � s:i"�i �'`�,r r .. . . _:i � � .L _ ..i i�. .. � .� .-�Y.. �Z�._ . r..`� .. _._ ._'�'�-��/�s�,.`t. � ._�._'�'..- . .. ._-t�.�. ._�.._.. ..�.�. __... � � ' - . . � � � ; Brentii-;�ctaim '• Aitact�ment B � � ]anuat} 1$,1997 � � Kiczg Cout�ty Invo��ement. ; � � - � fikir:g Courrty�tainlenance avar a penod of�hree months hav�been cicaaing;lining and othenvise ' improv�rg the c�rainagc:ditches on both sides af 160 S�above my pro�serty starting at a point from SE � S.iOtlz s�eet. Ti3ese improvemenis and cleaning�:as exiende�i to a�pr�ximate#}� i hlock North of my pruprrf}•.Ti�is aciinn c ansea the drains�e wa�er tc)b��11 divcrtc�d tu!he cuiv�R at my propert}•sife rather � ihan somz i�aters be absorbec!by properties above mine. lmmcdi�t�ly�3orth af my site the Ccwntv andlor uthers divertei!�il«;aters draining an the VJ�st sicie of ib� -' SL• by�}:e u.s�:aC s cui�•ert undcr che rosdway to thc East sicf�ot l b4 5E thereby doabling the watr.r volume :� '' immediaEel�=aha��e niy hun�site. This action along with ditch�nprovemencs to ths Narth and the debris . huildup in the�itrh nest to my home caused an o�erflotiv of tl�e culvert area and ciirec!]y causL-d my ho�se � to be de�u�cd��s`th draena�e wat�,r. �believ�e the Couniy erred in improving the drainage areas above my � site racher t�a�� bzlow my site_ 'Fhis lefl onEy my Nausc to contain the�rcess flo�v of w�t�r. - 1 have included photoaraphs to trel�yau beiter un�erstand the Count�°'s negligence in this rnatter. ,S :� PhUto T�o.1 Uri:cwav al i�S!� lC�O SE-sho:ts drain culv2rt and�roia��ie af watzr on�VEST side of I6Cl S� � T'hot�T�o.2 l�rsi�tr��c and culvert tE'�ST side of 16C�$E }�flUtt)��O_� • C)r�ina�e af t}�atrr in diteh on 1VF,S�side of t5�3 SF.,an�the point►�;here this drainage is direc:fy ciased o(Tand roured ta the E�tS'1 side of]60 SE��d disecily feeds tltis�vateF throu�h my culvert. � Fhotn;,'u:=i Dra�i:�a�e an F_�ST�'sde of t6t�S�and immediate[y prior to corrersion of waters se�Phot�.No.3 1 Phota No, 5 � Drainape�itch on EAST sicle where�vatcrs f arn both E.1ST snd«'E5T diiches were diverted by the Cowity direc�!}•a�uve my residence. � Photo�lo_6 � Drain cc�h�ert from �VEST ditch to EAST ditch. ;� PhoFu No_7 • � EAST dicch ciirecUy 3�onh of niy r�sidance and after ths conversion of both«'ES'i'and EAST drauzage � � ditches►ntn on�drain�ae clizch. I ' }'hotv No. 8 = l�est side of 160 SE(across the street frprn my home). Althourh ther�is a culvert ore the South tt:� rulvert t:n�fs or is plugged t�fore it meets the drain water�on the V4'EST sidz af 160 SE. � f . � I .ti ;? � . _ I i�i,rk�:•:;'.`�.i`.''''.b'��r�'i�s�'�h�. :•s`��'�-`:.y.5�.'..'K.:4.;�3:'..,+s5>�i3�..�:.`�,i.-r�^� ��- .�._.. :4?'.`•'5�.�'�%L�;x::c.� . . ., �..;.,s ..�s r.-:�:'�.6:4�7R. ,�'s'�'sa. . �...:x;,Y'.-��ses�* t`i' . . +, . . ; r � . . . • 4' � / �� \ �.. ry�, `� R�•��I _ .... . 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Aescription of dztails: {see att�ct;mesrt A) � �.oss resuhed frwn a��roxim�te[v a fo�t rrr sn o#'waf�r tnttring ihe gcovnd�taar�rea of my ho�rte at I40"�S �� i ca.lvenu� SE and sever::iy damagin�cu destroying the c�nt�nts of the living area ofmy h�te. The � :vater�4es the result flCan overfiaw frem the roadside diiches and its drainage cufvert an 160 SE cause�t�y � J_O��gEOtYT�3�If t�etation 2.�ie�ris in the dit�h imm€di�tcty adjacent to my hame and 3_excessive+«t�r dr:s'v��e rQezted to chc ditch adjatez►c tc�my htrme_by the County. ;� . ; � :� .� ::.� _.a :._ � � � � y � � ; i � { . 3 � . . . � . � � . 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' . � � �•........�I..fi„�� +� ��.vY- .. �.�, "" .`' �, , ,� `�� ' � �. .. , ',y �' � �',�. : ., � �, � ��,, •� � / '•4 ,� �'M ,.,�..;� � � �,n � ,.. �� y ,� ' �� ' � �; � � � .. ii}` � ; ; .. //r� iFi �',K.� '� ' . • ' .��• T� ♦ .r., ....-�'' r -•r� ; °1� � , J�` � t' tv, i r'•a ►� /r . .• � . � ' �dddn�� ' &+ '.�r ��M ��. �'�� ..��'. � 1 - . ' . ��{.r, . , M1� '.ry. '1".�� 'SWl �'.�� f� 9�w�.Fw+�+e.� - " K Z �1.'� , 1 . �e'n:c'. .6 i'a'j?• . 'I[�. .'ly . �� - Y . . � . . . � . '. i:��{r l;j�o + � � � " . ��"' �1,., � � • -•� ��►,y��,''�+�^�Q�'i' PC + 4� ,"��'2yr"''.�v,�t�' � '' � ;, � �,r�'"i ;.,r�"'�Me;j� � � .+��r� �'•o�'i,�d3' . , . ... . .� � , g 1 . . 1,�' ��' � r :y . � ; i�? � r ,. . , f� a , . .��.-{r\n.r.,fk�* �•,...,I ± • �p� .. �.. � � .. 74 5 P i. � �/' ,�� . ' ' ! tA l` r,� r� ;,� 1 .t�' 1� ,� ��. � t N� ,,.;�^: i �'%� ,'�: t . � � ��„ �� ' SepceLnber 11, 1998 , T0: Karen Graham; Claims Officer, Office of R.isk Management Tti I � � FIv�: Harold S hi, Manager, Road Serviccs Division � . RE; G►�in+� 2��OlGlaimant: Marchall M.,�r�nden/Amou�$S,SOS,QO `' Thank you for your February 5, 1997 memorandum requcsting comments and a rccommendation ,�� conceming the above-roferenced claim filed against King County. This claimant aUeges damage I ' to varfous pieces of psrsonal property due to King County Maintenance cleaning,piping and � otherwise improving the drainage ditchos on both sides of 160`"Avenue 5outheast, above his property at #14028. This work caused the dra{nage v��ater to be diverted to the culvert at his property site,rather than some waters to be absorbed by propertios above his, The flooding i incident reportcdly occurred an December 31, 1996,between 8:00 p,m. and 10;00 p.m. ; My staff has reviewed this claim and the findings arc as follows: 'o � The incident was confirmed by Road Services, Maintenance Division Four personnel who responded the same day to a report of plugged drains. Staff did not located a plugged pipe, apparently there was just too much water for the pipo, Also aAain on January 2, 199'7 County forces observed one-foot plus of water in the Brenden residence and a driveway culvert that could not handle the heavy flows. D�ma e o�tirmation: King County employees did not assess damages to the � property, The claimant's property is located below the road with no provisions to address possible overflow of the roedside ditch. RP� ndail n: I recommend denying payment of this claim. Althaugh King County has dona ditch cleaning, some installation.of drainage pipo and other improvements to drainage ditches on 160`" Avenue Southeast,this work was a considerable distance north of the claimanc's property and none of theso activities altered water flows. Staff did not confirni the claimant's altegations of a plugged pipe inlet, 'there is an 18-inch diameter culvert pipe along the front of the Brenden properry and � there is no history of previous or subsequent problems at this site. ; � � � Karen Graham September 1 t, 1998 ...,,, . Kinq County Roed SeMce Dlr�is(oc P�gt Tw0 Depertmant of Trenspc Road Maintenancc Sec I SS Montoc Ave NE Renton,Wq 98456-01 �eca� artv Ll�b�litv: None, Staff report there was just too much water for the system to handle dwing the storm of Decembe�31, 1996, The event included snow and ice melt concurrent with the rainfall. . September 10, 199 Remedia1l �,ction; Th�drainage system on l60`" Avenue Southeast is baing reevaluated for possibie improvements, � T'0: Harold Tanigu j�old Harml�s Ag�eement; None knawn, „ FR; Roderi�k Mats If you have any questions concerning these ftndings, please eontact Field Engineer Bill ' , 0'Connor at 296-8I�7. �� t C75( HST:WEO,Ie Attached is Change ( Conttacting Compan; cc; Roderick E. Matsuno, Maintenance Operations Manager � change does not resul � Bi110'Canr�or, Field Engineer � required because the � building permit applic , spacc provided and re " � 7f you have any questi� ' ��: Kaihy Brown, � Jon Cassidy, Su t . . �,, t � - ` _° . �� - �� ;� � � �� a�� '��TICE: ?*o el-wsz=.�can bc�*ai�.`e}'�mg C..�a�wL4�s rl:�t'cixm3ftia�tcah w�cbar�gton�tate T�r is prescxi[cd to f�e C1esk t3f Th�GecinciF. �1SFa fi€in��lai�t pr�a.t,�rzc�s,'I yw3i`i•�te thz l�fttre otRi:tic�,ana�cv�cne at(206)2Qb-7d32. 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KI�i:f'c)�17l S r.ti`UI.1�1tE:'��f(if�t�,ebr_.vtc�:tdaitify'c'�1i,�cc 3nd:,r at�tr'.r�n��id�ti'&� " --��'____,�,��Ckz.h� ___�__.�-�- - -- HFrI:�E.;.�.4b:s�.s*Ic�t Fro.�ae sai��nu.-�Li-rs.� t�} t./'��C� +it��t:ia t;� _ }:�. �� C�tYiStC'�'l � {`�i�GP�i4�� 2= t3 -C�1 �,.._� �. --�-- — - - -� �-� �EL� �u 1 � - �2�-�► �+r3 c�e�iF��-1r+�a.t� -��= , L_T �z}__i�t..�i..�:� �.��.�r=.�r� - 1`��+Z`'�'s �.��%r^ i�2 S-� ��..� (,Lic.:�i5��1 �� Z._-�.�-_`�_.��i_:,..7�_ � r`" _ _ _ 7' � PROPER7'Y D:1.}'41GE {ptrssc+d�.-smE�e!he v�3nd g�:rtM c+1'ti�,:d�mgc Fo rs.�ur 2u�nx.auti�ivhite'br pc�scxnl proyertr. :1�a�t`�m�bil �sriniewes �+a-umc�ationatd�u3g�c�i�uii�yir.�e_�' , `r=; :a . _ . . _. ` _ �. '—�--_-=�...�-- —�--� [� � +L '—t ---!`- 1 ._!'.��F. _.KFt�ea'T'�.�-tt��rti�L S�.C.I:��.` t Y>�7 _..��: � F�— __._'_�_ '_" _�,.� . -,—� ....._._...—_ ."'_. ___ . ..__- --..� '_3'�'� . . � - . , Q � . . " � II�.IZ'�Y�(if VS!u uY�c I31jL11Ct�,�1.,�3sc^�ivt dc'LSi�s�= ---- . ._<,..,....,. � - - � — � . '—..__. -._... . ....__._ ��'�" —.�� .-.�.�..,..._ —_—,._..._ _....f Scicyl�t'1 aW Fin��:ian(s)tx�mt c�fixs7��dx�IgiOfa.'ssentul(F}mvc.Ired_ ., _.� ."'—"_______,_ �—._.__ �� . �.�. - —._��—__.�.- :irc yr.0 fiifi nrci•-ing nar�iir.J 3rcat:nrnt7 R. ._�.��_.�..�_.-,-.- N � ,. 1 dec)sre undes pcaa�ty of�sc:tjwy undcr tb�ia�vs o#'th�Siate of Washington f'o is uve and artred:' � �� p,t.L'�}Y, � ��i�� ____._ ' ' �'�+ _ :.^ � 4 -r.�te and�'lacc(C-itl`;St:�te)) � Signattu�e . ..tis,��.l:_rS_'-y's5^ . . . . . . . . . _ . . ' _ . _ . . . � � . . .. . . ,� . . . .� � � ti 3� � t � ��i� � �-� �` � ' 11��ERS FL{){�D►- PAG� � t�F 2 l Il1�Ifl1--Arri�}ed hame at ap�ro�ir�at�Iy 530�m ta fi� t�mt�law�r I�i��l of the hous�had �1cx�d�c� that�l�y. ?viost+�f th��at�r had soalced m�v th�carpet aind pad b�+thz time that I gat �iome. B�t�at ti�ne,th� ditch��as also lov�-er but I suspected ihat it ba+�o�e=flo«ed, Th�re�-ere sig�of c�•aier�nd�i�}�z;s n��ing�z the drive«;ay fxozri th�ditch sa I c311ed Kin�Caur�t�F to r�gc�ri th�probl�m. 11129t01 —I c�lled Kin�:Gountn�Rcyads Di�-ision a�ai�.� They st�t�d ihat somec�ne�t�u�d tie out on A��nday,D�c�mb�r 3'a i�i int=estz��fe the probl�rr�. 12i5lO1 - I arrive�hc�tne at apgroximately�6pm,I had a m€ssa�e vn�my an�u,-�rin�nzachine�t`t�� til�nny Es�in9s�wzfh I�i�i�t�cint�hoad�. H��ted_�at l�w�:.�zn m}��neighbor}lood an�woulc� be out tc�my prc�pertti in a�pr€��cinrately'i�hour. He dis3 not staie the time that he catled anid my ans�verin�machine doean't traclt it�o I do uat kno�v whac time flf.th�day he c�lled, This�ra� the onhr messa�e il�t I recei��ed fram him. 1 do r�t know if l��w�s out�o my-�uuss��ir not_ 12/131A1 --�iv r�3#e arrii�ed l�ome st approxin�azely 3 pm to find th�t the ditch h�tl been overila�{in�and the��-ster mm�inrg into th�h�use again#}u'c�ug�i th��ara�: �he��ed m��uid I calied L1e�n��unty Rc3�d I��risi�n ai�:s��n.I��l��H134�411 3��ECI �f.S_��pIll. ��5i8f�(� that the draina�e tiIe probabl�n�ed�d to be up�rad�d to�andle a lar�er capacit�of�.ater flc��. He instru�ted�ne to cali 1-80�-KC;ro�. �fy�vife alsa c�11ed 911 and�he Rernton Fne Departm�rtt��a.�dispacGhed. B�ll Ku[lbur�and ha�cr�w fron��ing Counitir Fir�District�2� assisted en dz-ainin�all of th�t�=atc,'r�'rom our ht�m� ��t day. 12/i 4/4l —I called �-$(�4-kCRoads and t�ikeci t��oL�I��a�ier. :'1il 4£th�oiher ernpIoy�es tiv�r� c��t at l�uich. I tol�}�im t�at this�u�th�sec€�nd ti�ne that th�s h�haP�n�d and�•e n�eeded sar��eone aut tc�our hazn�to se�the damage as soon�s possibl�.He s�.id th�t sQm�one v�ould be cc�ntactin�us and would com�out�nd�ee tk�e dama�e before�'e r�p�.ired an�-thing. He_said thai this persc�n ��oulci t�e ou�la�t�r th�s<'u�e d�;��or��Ipn��s,I��ember �7�'. '� � _ i rt2l1�#101 - I called and talked to Lori Kronan at 1:�� pm.;Sh�hac�.c�lled�n}�•;�ife ear3ier��1 ' �tated that t_t��had a"vac �ek"atrt to o�a proj�er�'an#he mornin�of Dec�rnber 1�`t`bu�shz didn't kn��;' 1��1��1�tI �QUIIt��ItZ�}1311�[}l�L�:aulct.haw�caused the gra�lem. l.�ll8ifll—G�lled a�9:00 arn�nd l�ft�rness��e f�r�r.��d�de�rtment to st�if thel ha�!been 'r oizt y-et aixi if thz��hat3n't,it��as inlperative tt�at th�m coIIie out AS�P b�caus�ufe«rere having � ne�•carpe�z�nstalled and c�icin't tvani tbis to h�ppen�third#ira�: 12/I8141�I call�d �-��-K�Roads at 3 p�n. 7alked to a�oman at firs#,then t��a�tr�nsferred � to �.c�ri ICx��ans voicemail. I I�ft her a messa�e to cali me. Lori Kronan cailed me_baek that i I same dav�nd stated that th�re v�=ouldn'�be an�-one firoFn their departrnent laflkin��t#our , dama��s_ She:�aid someone�ioulcl be vur to�.heck�ut the�drain that same�f��rnioon. I, i ', O - � . . f `. . . . . . . . _ . , _ . - . . ". . '�. . , ._ . . ' " .' . _ . , . . � . . ' .. . . .. � . . �. , . - : . . . . .' . ��s�� ..� � � � . 1'��E`�ERS �L��— continu�d �"A�� 'Z 12127/p1 --I�a.11ed a�Rin at 11:5�am: I asked for I:ori t�uf sh�was o�t intE�fiel�- The persan it�at I talked t�laoked up�ny f le and said that nothin�was reparteii as bei�t�d�ye�"Sh� ��=oul�i l�at�z a mes�ag�f�i�Lc�ri. = � � 1�I�Sf�1— 1(?:3�arn--l�eceive�call from �.ari Krc�nan. She said�e hacl be�:out at our� � prQpem and look�d da��z�our d�in and dic�zt't�c-�an��blackag�. She saw a:�li�ht b�ia�in ihe I� ' pipe n�ar the t�le�sh��e pol�e�rea,but nc�th�t��hat should restrict#Iow. �h�'.s not stire if th� vactor cleaned put sti�tts or debri�,but�t�rben they va�c�red ii,they fonnd�c�thing that was of l�rge�raporti�n t�can�e htoeka�e. She said�he had f�lee�the F�P�rw�r�e ta have�h�ci�t�h idu� . and elean�d. 1l2�142—Called Lori�ronan a[7 a.m,i�ormin��r fbst the di�ch«�s�r+��titig a�ain and it �eed�d to b�foc�ked at immediatel}. S6metime that Fnorning after l0am, som�ne was c��t to my propert}', but�i�that tir��e,the vva��r i�i Ehe dit�h had decz�a.�d." 'I'hey left.�lQa�o�sandb�gs in a pile in �rt} drij�ewat. �he, staied ih�t she had itlet! the tec�uest tt>h�ve th�dit�h clzsned but uas tlot 5ur�1�-hen ihis u:oul�i happen. CU�ZRE�IT SI��!�TI�I� - As of toda;T's c�ate, the ditc�� has not been ti�� aut a�d'there �re stitl times diirin� ��eav�,� rai� ti�rhere th� water is at a ��v�1 l�ghe� th� ��pected, � i � � fY r �, '� � �� a � �' � � � � �,� i: ,, ._ ._ I O I Q , � � ;;, � ::� ; ';`<.:. . b�' � ti'�1{,�" I� •.j � , ih �� (�( -��a1'� � � �� . . . �d }}'�.',�� R. . f � r t�.. � . . � � ' ,, ' t Y•� �9 4z y1 j ,� r��l . � �� M � ,� �� "e' s �� .�.� p . ,y�+af� 1 ; �, .�, 1 ��i y�ti�� {;> i .:i ,-. tfxF� � o � a^1}P�� , '�- (i. i r ., � , �y , �+.r ,�v �r � - ,: . . . � . � ' , � , tt�x +^� t�.'�"� ,,." rJ�� ...:., � ; "� + �.� +�.P � ,�,. - � . �.._ �sr9v{ , �w'0 "�a .�ra � ., . . ..� .u�! . N:, .. . . � K, � � � M r� �,a � � : +�` � �) 4 ° � u �S �r�r ��x��"�� ^ ry � .. . i�� F�f{� �' .,k"� '� 'R� h 1 �y. +T t . . . . �� .�r .��.1q� �`,j . . � M4�a.� 4n. � ?�� Y . i':. x "' "a1� v F�� Y, w !�.F�g,. . � .�? �,�t, ��Y�A � . 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' � , � .�� i � ' , � ,�!� �.� �, � King county Road Services Division Department of Transportation 201 South Jacicson Seattle,WA 98104-2637 March 27,2002 TO: Robert Hansen, Claims Officer, Office of Risk Management FM: Linda Dougherty, Manager, Road Services Division RE: Claim: 31249/Claimant: Chad L. Meyers /Amount: $6,402.61 Thank you for your February 12, 2002 email requesting comments and a recommendation concerning the above-referenced claim filed against King County. Tlle claimant alleges County responsibility for flooding damage to the garage and lower level of a residence located at 14028 160th Avenue Southeast, which occurred on November 14, 2001 and again on December 13, 2001 between 8:00 AM and 5:00 PM. My staff has reviewed this claim and provides the following findings: Incident Confirmation: A query of the Citizen Action Request database produced CAR O1- 005097, received from the claimant on November 30, 2001 at 2:55 PM,which stated"ditch plugged from last rain, had water in basement." CAR 01-005343 and O1-5405, which were received on December 13th and 14th also confumed the incident. Damage Confirmation: Roads staff did not confirm damage to the Meyers' residence. Used sandbags were, however, located on the north edge of the property, which would indicate a flooding problem. Recommendation: Staff recommends this claim be denied. Roads staff believes there is no liability on the part of King County. Second Party Liabilify: Please note Brenden Marshall, Jr. (former owner), filed a claim for flooding damage (Claim 21860), which occurred on December 31, 1996. Staff investigation confumed the installation of an 18-inch enclosed drainage system extending across the entire frontage of the property. A check with DDES could not locate any valid right of way use permits authorizing installation of this pipe. Staffbelieves this pipe is undersized(and probably�vas at time of installation) and cannot handle flows from event storms. Roads staff further recommend Mr. Meyers check his purchase paper work to determine if the `l�own' flooding problem was disclosed. C� ;{ 3�:�.. . ' . . . .. ... ., . . .. .. . , . � � � � .. u�'� . . • . . ... .. . .. �•�f:'. . _. Remedial Action: County engineering staff have reviewed the site,have assigned tra.cking number(4-1032) to this project and are currently designing an upgraded system to correct the problem created by the improper pipe installation. Hold Harmless Agreement: N/A If you have any questions concerning these findings,please contact Office Engineer Bill Hintz at 296-8709. Enclosures: cc: Roderick E. Matsuno,Maintenance Operations Manager Bill Hintz, Office Engineer a2 � � ` � � JpY. 8.2001 5=0�sRM KC f.LRD . ' N0.64Z P_3i9 , • _ � • . � . . - - /•' /_ tCtt��OUN'iY SURFACE WATFR MANAGQViQJi'DNt�t9l�— �,-_" t/ � . . DRAII�TAGE T,C�(VESTZGATION REPORT - � � Pa�e 7:•iT�VE5T1G/ITiON"RBDUE.S7 _Zype � R��a t� �?t�tf. - - � ��G�9j, o�ce e�r. � �o�a �7�-�`J�o � , -.R�r�.ae s�: . �- �..�.w�p�►�.�. : ' �n a�•� !� ,�:� - GY - � ��=G�� .►�D�: ��o�� s i-s�a�� .� �► y`r��; � �� ' s.oeasor,o�prodeai 1F axt�m,e - � . - . - - ,�;' �� : � - � Rs�orseeProma.�r ' '/ ��"�� /��..�`� � ..2�i ✓�z�'�i-7.��t � ll.f1�l!l�4. Crr�/1.��/�4d�i' �/ . � :.�n ��n-r�fc�•-r�.cJc� it Z` • �- - �'�' ��'�'�� . ��iri iau•�'�r��'�-�� r.'.:¢��x��%��'u!�'�_d i��o��n,,,�x-�«lc.�.�a�- t�urrn c�.'u.��-�� Zr.��`9�..��.J ." �"`n�� `✓yr �.�.� ��1,e'.��.� � ��.� � t-�'ir.r.r,�;��,�,. �_�-c�.�s-�P� -J;S9 /.'?/?!1l.G7'.�� L'��`� /'«�.r.-'-��l' n;/� ��..��-�.c�"�; . • � ' � � (� �-��l.� .dc.�� "�- . . - ' � � ,c.p��` A � - g�``' y ``�-o. . - ' . �• .. . - - - . � Plaz-rs:r+ec• • R�L� L�� .�:% . lat Na �� ffiock Noc � O�er agcncles i�va►vac� No Fleld Ir�vsstl9at�On Need�d � . �� 5�� Z3 _ � �t r�o. �z s 3�0-ciio �a �r!�E ��n.s�rsE,�,lo,�"76 � i��, s 7 �c . - ' . � � �f=E � - ' � Basln.G� • Coix�d bts[ �� Ctsarps I�o: - RPSPONS� C.huen not�Tied wT�-7A-9�b'Y ..SC P�a_. ��g� ��°n • � � • � n �� aQ�e�..�" . s..�f .'`-'J�4�� HL6c-,u,�-�- 6�'TG` -�` �+�.�.�ya�'""'� Ra""...r � � _ ,(>�?.y��C '�� -� '�� '�:� ' . � DJ5P05lTfON_• Tume�to �` `On ��a i-5 7.by- �� OR l�o fsrtt�er adfon reoosrvnersded Dec � Lead aQency has baan noe8ted: � ' � ,_Problem Tus been cotreded ^No prnDlPm has been lden"�'ied. _Prior lmresttgation a3dr�sses prot � - • - S..F,w• _Pin'ate pin�hlem-NDAP w�77�:conslder becausc • � = VKatnr oripmates onstte atd/or as nni9fi��►9 D� � LocaUon�wtside SWM Service Area _ —Ot�¢r(5pec�. �J`.17.. � -�--f-�� S�� DATE CLOSED:�J by_ ��i,�. • � � � ' � � � ��'��'��0�"� ��"° Drainage Compiai�ts -From the Files of KCWLRD � � 63 � � � JAfi_ 6.2061 5=0nP1M KC bLRD �'� P'4� 1. Comp]ainc 97 206;Don G�,16046 SE I4Y'"Pl.,Remtoa lavestigaced by Scan Groom on Ol/14197 �c�iztYg 2�r�a Dved st tnc aoove rcSasace,Q locatiou aace tlx e�z2y 60s(Sis hrn.se o�s socond DviIt in cbe � devtlapmetlt� Stufsoe aYtum wsiti Ilaws began flooding bis gaiYgc appro�da�ately fi�2 ytats agU. A[hii vwa expcasc at thai time hc bswgbu[a bxY hoe im to aa a dxainese di�ch alnoy tbc batY ade d'Lis pxope:ry. ZLis opcn ��D��3��8 m�P�edpitrlion ore�s a�uface wata movcs uvuas his p�oQtsty_ Stvim watec does breecL tLC top occacionaIIy. 'I�LC dioch flk srdimmts ttp and he cieazs thc ditt�d d�is tS�8oau do��rn md re�ces flow. Hc waDa tLe dr8na�e ditch durioa a�creats(Ae wasn't amuad f�thc iasi swia evmt)Lo obeQve its fttnctionality as a ptas000n as w�eli_ Be w�ands tLe dcaiaage Lo oontim�c doaa 150d Avc SE mstad or a coa�eyanct sysocm azvmad Lis aad ndF,hbart's p�roprity /�ppatta[!y;as deve3oQ�ma�mrtL afl�it pxnper�hnr �aca�ed additional tunr�is o�ated'mm the drainage alnag 160a Are SE sad snDmoqocntiy cm�s to his ( prope:ty. i 1 Srin�xngwarc,�tzam 16D'dAvc SE marLar�es f�n tLss asta. Low par.alatinn, G¢c�stid tLe 7and ma't bc devrloped cecrosc ffi�y dna't have l6e pacolanon f� �luatioa d Sc�Cc sysoems_ � � � 160`�'Ave S.E. -_._y 1 � __ �� q,�r v�r� 5�'�4)� 16038 1 _ I r� a f � � SE 142�Place /C0�3 � ,'��am�Je Ser-�-ie �ra,..�i e�� t I • /� ' } e c� � ` `,o0 5 v�i � �S� �� K. �, �Z�� `�' o W ----�-+ � � �-��"�L��='y��"� ��• Drainage Complaints - From the Files of KCWLRD 64 � JAtY_ B_2001 S=BSPf7 KC ►LRD IVO_642 P.7i9 � � ` � �� I r � foPSIdf8 7UfD DZEQJSSZaN � !!r_ Gragg is coac�raeQ about eoaiinui�sg ape**�� d4velopmenL whicb � typica117 reeults in aor� aurfac. wat�r 12Qs+s througD Di■ drainaga dttch aad occasionallr iato his r:rd_ I rzpizimd tAit for largar � Qc�elopmerrts .azere oore tLan 5,000 aqaare fo�t of impozvioue surtncs■ , a=� coaatractcd, the dtvalopar•e Qagin�er ia os�17 reqnixad to revie.r �ha � draiaagc syatos•• capacity ap to one quwrt�r of a aile do.raetreeu�'fawm t!� propoeed plat-e outlet point_ ioz •ingle booe�i�ar, t6are ta � ao=ma11p nn cbwastrcas aaal�wia requirad ai.nce ther� i� naaellp 2eas thaa S,OOO square LeQL ef aev istpervion� suriaeaa coaacructcd. � Z �ngqeatad tnat 2lr. sraqg look foz Dav�lopseat Sigae alanq 160� c�ozth ot IIis howa. lihen he sa�� aew siqne, � c�a �ttaad pvblic bearinge aaC � �+r�ta letttss expressing Ilia coaicerns aad outliaiaq Aio Qrainage ��- � n�,.Q a� = iao p,�m ��: r Po wlution to thie drainage problem vaa ideatifi�d. Nr. GYagg � zequ�stsd tLat we claan out Qie drainaqe ditcb. Wa o=teztd to clann wt part of Aia QitcA if our coMractor can get tha aocoeaary equipment £ram Gzaqg'a drivevay iato tha ditch. r NO PRIoBITS 3COatS N]�S �'�t�'^'s'++*+ SIlTt� NO SOLQtZ00f KAS ZDS1T1Z1�ZZD � � � � . • � I � I � I 3 � � � � TfTLE ! �I��g��+�� K- Drainage Complaints - From the Files of KCWLRD � 1 C� � i 1 1 1 1 Jt7t. 8.2901 5=�1 KC I�LRD - �'� P�S�.o r'M'�7� , oo¢z�+s `�•Y�oa � "°��Ta.��r�w��.�,� —`-• _ '��i*mi*1�1��mtmrds4 yvs►e-,,.)��I� � � tsz�ostnooD Dsanuae nsa2caasca ��to�ar (�ar) ( oc.aPt.[n� svai�oaszon �m�o � D7►TE: 3-19-97 .. TO: TZL� � lRO�le alaL Maylri � Ra: �P �ALV�TICl1 �Oli �LaIHr llO. 97-0206 6R71[�G � 1GOa6 SY 142� YL.11� 1�TOt 135-0168 I COl�"LaI11? Cffi�QZ06z� . _. _' C7iliGlnaL I-1P-9? rZ3LD DIV 2-2s-97 DS �!i G7100ti � I 72�D �tLL. 3-T-97 EZ �Y ?�YffieS_ - O�� lTLSSs 1RlS � S�iL7�lOt�s � i Pleas� ae� ttae attac.LW dr+�� co�laiat iav��Gi��atioa r�pori 6at�d 1-i�-97 by 9saa lirooe. � r�SlBS: 3iac� the p�ohl�t �eei� all of th� 1maP psvject criteria liac�d D�lov. it quallfies fnr and has beaa laveotiqated uadar t!x lm]►P progrw. • She praDiaa •Sie i• withia tIIe SqH service araa and doee not in.ol�� a risq coamtY (�[C) cod� violatioa. • T2�e p�-capie� ai�e �hovo evideaee o1 or raported localizod floodinq, erosioa and/or esdieeatatiom ritIIin tha off road Qrainaqe �prteos oa pri4�te re�id<ntiel and/or eora�ercial gropazty dus la par� to later vpstraas aevelopmoat. • The proLlm ie eau.sd by avrface vaier fraee aor� tbaa on� ��4 P�'P��7- SOZLS: �►ccorQiag to tha 7GC eaile �ap, the sitx ie locaieA in tLe follo�ring soil associslion: )►LD¢Rii00C 71SsoCi7►TIOtt: I[odsra2aly �11 draiesed undralatinq to nilly soil� that Aave daaoc, vazy elow2y permsable glacial ti21 at a d�pth oi 20 to s0 inch��; oa vpland� aad tcrracae. Z mt vith itr. 6raqq oq Mareh �� and toarad Lia propertp_ J►i develvpseat oontin��s ia tb� appro�cimato 60 acr� dratiaaqe buin mrth of Rie PmD�rtY, mre draiinaqa vacer hac been rouLad avuth into t� penA locatad jaet 7qM of hi.a property w*hicA tl�ee drains �avt and aaath around tA¢ edqQ of hi6 propertp. . 2 7IJlE ��Qg��'��i�RlP�i. �-�• Drainage Complaints -From the Files of KCV1�-RD � JAN. B_2501 5=65f'C1 KC 1�LRD M0.642 P_6i9 l ! !iT O yJ 1 Ae requeSted 2hat ihe dzainagr flrn►ing swtA a2ong the eeet eid� of 160� nwaue SI bt zttoaetaQ stz'aiqht eoatb aloag tAe eaet elde of 160� pa�t SE 212nd Dlaca rath�r tt�a tA� cus�at rou« srhich r1oM� oaat aad •outh amand Lis proparty_ lir. Gragg statad that aQvaral lot�g ios� r¢�idersts Sav� told �is th.e dralaac! uaed to £lov atraight ro�tth along tho w�t and east sides of 160tb all �L� vap aown io SE 16��. Z otatad tflat maI be true bot t� e�cittiyag drainage patt�za is ald �d canx�aG Da raviasd Deeiuse it ie coneiderad the sstaDliahBd drsi.aage pattern for hie nzaa_ - Z revin.rad hie and hia tw neig�bor•• drainwqs rslated Smpacta and ' scorad the problem at 11 rits Lie qaraqa nnd �optic ryst�u impact� aad 7ard dasaq� to Lw pz�oyeZil��. altlaoagh thc laat tav 7asrs hw�s DeeRi esp�cially wt and bsd, I ratad the eo�at iraquaac7. at 10 0� autce BvBrp 2-5 pear� vhich is my aaLimale of t]�c fraqucncy of hor oftsn his eagtic •ystam vill b. �w�z+ly 3mp:ct�d o�cr tbo lonq tozm. isr. cragg atatad fh�t bis pumpcd cffluent eaptic �yoi� has �.ozk� ii.n� tor tAe =Ssst 15 yeara. Ho..a�.ar, h�e hae bumed ap four p�pe within the last thsva paara dna to the incr�aeed groandvatcr floc� inio di� ��ptic taak/dzal.afield area. Fram his vet/d=7r e�saon ohn�rvations. Dc is coav�ced tnat most of tha qroaadvat¢r comee from the drainaga ditc6 loaated jnet abo�e Lia drainfi�ld_ wa zevierad vap� of proiecLing hie eeptic draiafield froai GAe uio�eaeat of grouxdwater fzoo the upAill poad aad drainaqa ditch. 1fe ciiscaseed vays to eeal ilne carttaen d'atch iL�elY usi.nq a plutic liaar or a l:rge hwlt round or full plpe occtinas alonq abaut 50 ?eat of ditcL nbove liis draiaPield. I pointad out t�aS coneideraDle groundwater a�a7 still Slov Srom noYth to south bglov ths ditch eectioo so that •ealiag ths ditrh s�ay aot eolve tIle problom. � Deprnding on t�a depGh to hardpan, an imperviove vcrtical layar of plastic or bantonite alurry located uphill of Li• draipfield betweea hie draiafield anG tbe ditch vo�ld pzobaDly Da tha aasi�rt �nd noei ef£ectioe eolntien to thi� p�nblem. This ia�pez'iws lay�er ++vald rua from tDQ around s�:rface dova to tAe Aazdpan layer vbere it wau16 be ksyed dovn iato the IIardpan layer. Beeauo� �ueh a 2ayvz vov2d r4etrict ihe flw of ground water, Aig�er groundvater l�+rele auqt�t resnit ia thio part of Grwqg'e yazd vitA moze gsouadvater ��rfacing duriaq che vet a�aroa oepecially naaz eaeA end of svch an inpar�tous well zesultfnq in mora vnt aQaaoa wrlac¢ .�atnr ae¢page/flows and icy conditiona on portionv ot llr. Cragg'a drivewa7. For an� wrlc thie cloee to tt�e drainfiald, any yard draia or impervious facility of ihie kind would Aave to be zeviewed aad apprwed by thc 7Cing Cwatp Resltti Dapartmaet (Flayne Olaen at Z96-9737j_ � ( 2 � � 7ritE ��6��'"��°� �� Drainage Complaints - From the Files of KCWLRD � � 1 - - �_ .. ,:,.,,-----__-_—+ —_--- . . --- . , . ., I, r- . — — — -- i � i i i i � w . . � , � \ W, r � , � ' ' � � ' � � �, a I � ; ; I � � z � f � • ' � T � � � � , � p_ a f�v �� ; .� � � eb °'�, "Ae� I � I I 4 � �� . .. � •' • �� , •��" // I �I 1 � �,Y a � � �;, ' x � �� A � . � � . ... . . . . �q . � , � : : Y o � m . � : . . : � � .. � : ..� � � . ; � � � . : : � � 3� � � . : . : � w ` :, . ; � ; . , , .� � � ., � : ; . J � .� i '��, q Q I ,./'• � ; ' �] � � � �` , •� � � ;I ' N � � ..�,I,�� I 1 � C�{ N � o N, -� � .. � � I; � �,.�� ..�. S' �,: �; F r ��'' "' � �'I;� , "�' .. } � � .� I r � .,�.._-ZZ-- h ' �' � , � .. �. 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I : � � � � CA � ' � �.c o �I (j o � � s �, ; �, i m p4� , : i �j . z ;. � ; � Q�P,, . , . ,. , , . . . � . . N n.. . I . // _ �� ii i •� • 'll, .. ��__�___�....__i.��.______� �+ �� _ � , . .Y ' Ii�'i�� ___ Y/// ��_ � ' t�• ' ,'� n �I �j� .i'F a i � � � � , ii . . . . �� M W I I� i° I� , {•� . �i i i� 1 i I / . ( � ,�pp � � . �� ' �( li pp N . I� �:m E �� Q . '' .. i�� y, i i x � '�:.� t ss ♦ / Vj � � �.ti�, � a��, �rnu Q 0 Q �� A � ��t Q/ � �f � � ��,�� • ' �� '�. ,� '�,� ,1 �pp �° ei . N ' ' ,•�,.. �rs�I •...��'`�,• �� Q � i i i � • nr�• � � i � \ +a � i Q �� .' �i f �� r � � .ii• ' F� . . I: � +�a � II I i �i / I� 1 , .. . i � . . '� � �ii� s� : � t� % II � I� �� i� N 'r,�, • i ,� 'II � � ` • � Q: II . ..:.. : � .r � n m ;��..�....� '. � � �� .� u fd Oo .� � P� �. .� '�,� ' ii W ' � � I ��U � � d ��//' < , : �,......-..,� �I �� , • �.1 ' ^, ,�,- �•, ,�, , ; � . ..�:• . :`,,,. I ., ; � .v�, ,/' � :SJ� � � `•\ X, f �.�� .�+a�+ I?� 4�;� *' W,e'%;� I �\\ � •.. . . .. d � . p, r � ' � . � �' . . Q � , �� 6 � �o � .� 1,� � i `t� �! f�L �� i � � ..oee: . :��t� ; \ -.m _ i .� y •� � i j r z � � � � ', N • ' «r ': � �� ' \ �o r ,•,• /��.� � G m ' P o m �J "l ., . 'r . . 9s9_� �\\ ._�_ 1.��O ,`.• . . �,.A �Q'�'o' i'r 4�� • ' . � i , �s II G� (, �—+ ' •�'• /� i ,� ' / . • v•• E I , . ..�.._ II II . • ,� „ . 1J _._'.1\' . , � Pa e 1 of 4 I 9 OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Baain; Basin drainins�to 160th AVE. S� Site Visit 1/20/2003 Site Visit 1l21/2003 , Weather Overcast Weather rainy ' A B C D E F G H Loca#ip. Qraina��i Dramage Siope Distance from Existing Patet�#i�l Obsenrations Q#�'ield . la c�mpnnent Typ�, 'Component � Site�?is�harge , f'rablems , ;. Problems inspectar, R�source Nar�e, and Size Description Reviewer, or ; _, � .. ' , , . . Etesident . _ see Type: sheet fiow, swale, drainage basin, 1/4 mite=1,320 ft constrictions, under capacity, ponding, tributary area, likelihoad of map stream, channel, pipe. vegetation, cover, depth, (%) (�T) overtoppine, scouring, bank sloughing, problem, overflow 51xe: diameter width t a of se sitive area sedimentation,incision, other erosian 1 37LF-18"LCPE Crossing SE 136th St. N.to S. 1.4% 0-37 None SEE NOTE 2 2 CB(Shallow) Collectinp from pavement N/A 37 None System in good Condition 3 218LF-18"LCPE Under grevel drlveway 3.8% 37-256 None 4 58LF Channel 4'wide;3'deep 4.8% 258-313 Rusty weter running from None Slde slopes 1:1 Rockery to earth lining the east 8"plastic pipe 5 38LF-12"LCPE Under utllfty access drive 3.8°� 313-352 Eroslon due to a water Water pool 2.5'wide.5'deep ouHall from pipe to channel (�south end of pipe 95LF Channel 4'wide;2.5'deep o Side slope 2'from edge of 4"roof drain east,At beginning e Side slopes 1;1 to 1:2 Earth lined 4.2/0 416-468 pavernent � of channel Straw ,��ti bail 7'from S.culvert 7 20LF-12"Concrete Under dirt drive to back of 0.4% 448-488 ponding�south end oi �� Plugged 4"roof drain east� prop, pipe �Q,� south end of ipe 41 LF Channel 5'wide;2.5'deep , Water pool 3'wide.5'deep. 1.5'edge of pave.to edge of 8 Side slopes 1;1 Earth lined 3.2/0 468-508 Straw bail 9'from S.culvert water 9 18LF-12"Concrete Dirt drive to back of properly 2.2% 508-527 None SEE NOTE 1 � 1'outfell to 2.5'wlde 0.5' - � deep weter pool at end of � �� 153LF Channel 4'wide 2.5'deep 3.0% 527-678 pipe. Straw bail 6'from S. 5'EP to EW�S.side of '� Side slopes 1;1 to 2:1 Earth Iined culvert.Straw bail 57'from channel �W N.culvert � 11 74LF-12"Concrete Under asphalt pavement 3.0% 678-753 None None SEE NOTE 2 NOTE 1: LOCATION ID 2 TO 10 WILL BE UPGRADED BY THIS DEVELOPMENT AS PART OF THE ROADWAY IMPROVEMENTS,AND WILL BE SIZED TO NANDLE EXPECTED FLOWS. l . NOTE 2: LOCATION ID 1 11-24 WILL BE ANALYZED AND WILL BE UPGRADED ACCORDINGLY TO HANDLE EXPECTED WATER FLOWS. +� � �� x�viaiT e ��so Page 2 of 4 OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Basin: Basin draininp to 160th AVE. SE � A B C D E F G H Lacation � Drainage ` Drainag� Slape Distance fram :: Existing �';: Patentiai 4bservatians of Field 1� ccrmpc�nent fiypa; Gomponent Sft�t3ischatga Probl�rn� � Prnblems Inspectbr, Re�urce ; Name,and Size Desc�iption Reviewer; or Rasident sea Type; sheet flow, swale, drainage basin, (%) 1!4 mile=1,320 ft cr�nstrictions, under capacity, ponding, tributary area, likelihood of m�p stream, channel, pipe. vegetation; covor, depth, (FT) overtopping, scouring, bank sloughing, problem, averflow Size: diameter,width e of sen5itive area sedimentation, incision, ather erosion � S.end of N.pipe broken. Water currently seeping into 12 CB(Shallow) Collecting surrounding water N/A 753 CB in destructlon ground.Made of Conc.Bncks. Bncks out of place. 13 52LF-12"Concrete Under asphalt pavement 2,0% 753-805 None SEE NOTE 2 14 CB(Shellow) Collecting surrounding water N/A 805 Water likely seeping 4"roof drain into cb from east underground 15 35LF-12"Concrete Under asphalt pavement 2.0% 805-840 None 16 3.SLF Channel 3'wide;1.5'deep 2 0% 840-844 None Side slopes 1.2 Grass Iined Property owner noted water 17 38LF-12"ConCrete Under gravel drive 2.0% 844-882 draining into property over 180th 3yrs aflo 118LF Channel 5'wide;2.5'deep o 3'wide 0.5'deep water pool� �g 2.0/0 882-998 end of channel ,L Side slopes 1:1 Grass lined Straw bail 44'irom N,culvert 0� SEE NOTE 2 � 18 55LF-12"Concrete Under gravel drive 2.0% 998-1053 e"outfall to 3'wide 0.5'deep c�� water pool(�end of pipe AdJacent property owner noted � 156LF Channel 3'wide 2'deep o that water par�aly drains onto 2� Side slopes 2;1 Vegetation lined 2.0/0 1053-1209 the north property durinp heavy : reinfall.Flowing southeaet then , south 21 44LF-12"Concrete Under newly paved drive 2.0% 1209-1 53 None straw bail e'N.of culvert Straw bail 128'N,of culvert 125LF Channel 4'wide 2'deep o 4'from EP to EW�begfnning � 22 Side slopes 1:1 Grass lined 2.5/0 1253-1 78 ot channel SEE NOTE 2 Straw bail 30'from S.culvert 23 28LF-12"Concrete Under Gravel drive 3.0% 1378-1 04 None NOTE 1: LOCATION ID 2 JO 10 WILL BE UPGRAOED BY 7HIS DEVELOPMENT AS PART OF THE ROADWAY I PROVEMENTS,AND WILL BE SIZED TO HANDLE EXPECTED FIOWS, NOTE 2: LOCATION ID ' —Z�{' WILL BE ANALYZED AND WILL BE UPGRADED ACCORDINGLY TO HANDLE EXPECTED WATER FLOWS. 0 s� Exyi/��r c �C,�'o � Page 3 of 4 OFF-SIT� ANALYSIS DRAINAGE SYSTEM TABLE Basin: Basin draining to 160th AVE. SE A B C D E F G H ! Location Drainage Drainage , Slope Distance frarn Existing Potentia! Observations of�ield fC7 component T'ype, Gamponent Site Discharge Problems i'roblems ; lnspecfar, Resoures Name; and Six� Descripti4n , { • Reviewer, or Resident see Type: sheek flow, swale, drainage basin, 1/4 mile=1,320 ft constnctions, under capacity, ponding, tributary area, likelihood of map stream, channel, pipe. vegetatiarl, Cover, depth, (%) (FT) overtopping, scduring, bank sioughing, prablem, overftow Size; dlameter,width t e af sensitive area sedimentation, incisian, other erosion 24 35LF Channel 3.5'wide 3'deep 3.0% 1404-1439 Erosion of slopes SEE NOTE 2 Aimost vertical slopes Side slopes 1:2 Grass Iined 25 41'24"ADS N-12 Crossing 160th Ave.W.to E. 3.0% 1439 None None Recently installed(old pfpe was 12"conc,) 28 9LF Channel 4'wide 3'deep.9LF in length 2.0% 1439-1448 Nona None Was recently upgraded Side slopes:riprapped 27 20'30"ADS N-12 Under gravel drive 2.0°r6 1448-1468 None None Recently installed(old pipe was 24"cmp.) 28 112LF Channel 3'wide 3.5'depth 3.0°� 1468-1580 None None Was recentty regraded Side slopes 1;1 Grass Ilned 29 133'30"ADS N-12 Along property frontage 3.0°/a 1580-1713 None None Recently installed(old pipe was 18"Icpe.) 30 501F Chennel 3'wide 3'depth to none 2 0°� 1713-1763 Minor eroston at outlet of SEE NOTE 2 Natural bralded channel et end Side slope 2:1 to none Earth to forest lined 18"LCPE of 50'ditch 31 Breided channel Forested 1.0°h 1763=1863 None None Water flows east among trees 31A Ponded Area Forested 0.5% 1863-1963 None None Flow path through middle of ponded area 3�� 2,5'channel,1'deep with Earth-Iined 2.0% 1963-2113 None None See proposed mitfgation Side slopes:2:1 Shall be upgraded by this 32 12 Concrete culvert Under gravel drive 2.0% From Parcel A None None development and sized to handle water flow. 33 12"CMP culvert Gravel cover 2.0% 30 Will not be affected by this Road currently not developed development 34 12'��NC. Lawn cover N/A From Parcel B None identified None identified Flows wiil be maintained NOTE 1: LOCATION ID 2 TO 10 WILL BE UPGRADED BY THIS DEVELOPMENT AS PART OF THE ROADWAY IMPROVEMENTS,AND WtLL BE SIZED TO HANDLE EXPECTED FLOWS. NOTE 2: LOCATION ID 1 8 11-24 WILL BE ANALYZED AND WILL BE UPGRADED ACCORDINGLY TO HANDLE EXPECTED WATER FLOWS. ; S��" �XK��3 rr C �C.So Page 4 of 4 � OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE / Basin: Basin drainfnp to 160th AVE. SE A B C D E F G H Location prainage Drainage Siope Distance from Existing Pntentiaf Observations of Fiel� ID component Type, Companent 5ite Qischarge Problems . Probiems Inspector, Resource Name, and Sixe ' Dascription , : Reviewer, or ; , ,, , ; , Rasideni see Type: sheet flow, swale, drainage basin; 1/4 mile=1,320 ft constrictions, under capacity, ponding, tributary area, likelihood of map stream, channel, pipe. vegetation, cover, depth, (%) (FT) overtopping, scouring, bank sloughing, problem, overflow Sfze: dfametec,width t e of Sensitive area sedimentation, incision, other erosion 35 12"Concrete pipe Lawn cover N/A 150 None None Visible end of pipe from north. Under fence at property line 38 �20LF Channel Grass lined 2.0% 150-270 None None Collects water from N.pipe 2'wide 1.5'depth and from edjacent properties 37 15'12"Concrete Under drive to rear property 2.0°h 270-285 None None 38 30LF Channel Alongside of drive 2.0°k 285-315 None None if current flows Running east to west to on-site wetlands Is 39 12"Concrete pipe Under drive to rear property 2.0% Nona maintained. Running north to south NOTE 1: LOCATION ID 2 70 10 WILL BE UPGRADED BY THIS DEVELOPMENT AS PART OF THE ROADWAY IMPROVEMENTS,ANQ WILL BE SIZED TO HANDLE EXPECTED FLOWS. NOTE 2: LOCATION ID 1, " AND I 2 WILL BE ANALY2ED AND WILL BE UPGRADED ACCORDINGLY TO HANDLE EXPECTED WATER FLOWS. 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Edward J.McCar�hy,Ph.D.,P.E, 13428-451h Court Mukilreo, WA 98175 /4816 SE 116th Street Renton, WA 98059 faz (425) 742-8488 (425)7�5-5872 jaz (425)254-0579 (425)235-2707 December 5, 2002 IMr. Michael Romano � Centurion Development Services 22617 8th Drive SE Bothell, WA 98021 RE: Additional Information Request Application No. LO1TY401 & LO1P0016—Evendell Deat Mr. Romano: This letter is in response to an information request by DDES in their letter dated November 26, 2002. I have analyzed additional drainage complaints in the downstream Evendell basins tliat were recently released by DDES. The analysis presented below includes proposed mitigations for the downstream problems per Core Requirement 2 of � the King County Surface Water Design Manual. Drainage Complaints Drainage complaints along the downstream systems from Evendell were investigated at King County Water and Land Resource Division as part of the Level 1 Downstream Drainage Analysis submitted with the project's preliminary technical information report (TIR)(Haozous Engineering,June 20U1). However, since the preliminary TIR was prepared, the following drainage complaints and claim information have been reteased by DDES: Complaint ID Date of Address of Type of Flooding/Description Complaint Complaint KCDOT Action 12/13/O1 13814 160'� Nuisance Flooding - Ditch on west side Request O1- Avenue SE of 160th Ave SE overtopped road and 005339 flooded the owner's driveway and yard. Complaint 97- 1/7/97 14028 160t° Severe Flooding—Capacity of pipe 0203 Avenue SE system in front of house was exceeded. Water overtopped ditch, and flooded road and ground level floor of home. O Mr. Mike Romano December 5, 2002 Page 2 Complaint ID Date of Address of Type of Flooding/Description , Complaint Complaint Claim 31249 1/29/02 14028 160`� Severe Flooding—Capacity of pipe Avenue SE system in front of house was exceeded. Water overtopped ditch, and flooded road and ground level floor of home. Claim 21860 1/25/97 I4028 160'� Severe Flooding—Capacity of pipe Avenue SE system in front of house was exceeded. Water overtopped ditch, and flooded road and ground level floor of home. Complaint 97- 1/21/97 14038 156`� Severe Flooding—Inlet pipe in front of 0318 Avenue SE house overtopped and flooded basement. Claim 21699 1/10/97 14038 156�' Severe Flooding—Inlet pipe in front of Avenue SE house overtopped and flooded basement. I have also provided additional information regarding the following drainage complaint that was presented in the TIR for the project(Haozous Engineering, June 2001): Complaint 97- 1/10/97 16046 SE Severe Erosion-Soil eroded from bank 0206 142°d Place is deposited 50— 100 feet downstream and contributes to ditch overtopping and garage flooding. � Analysis of Complaints The complaints and claims listed in the table above document problems that occurred along the downstream conveyance systems from the proposed Evendell plat. The complaints were filed by property owners due to flooding caused by inadequate capacity of conveyance structures. The hydraulic structures at the locations of each complaint were evaluated as part of the Leve13 Downstream Drainage Analysis (Haozous Engineering,August 26, 2002)prepared for the Evendell Plat. KCDOT Action Request 01-005339 was filed on 22/13/O1 by Mr. Bret Bowden, a resident at 13814 160'�Avenue SE. The ditch on the west side of 160th Avenue SE overtopped the road and flooded the complainant's driveway and yard. King County DOT responded to Mr. Bowden's action request and cleaned the ditches on both sides of the road The flooding that motivated Mr. Bowden's call to the county was apparently � Mr. Mike Romano December 5, 2002 Page 3 caused by a blockage in the ditch. Two driveway culverts on the west side of 160th Avenue SE, across from Mr. Bowden's property,were modeled in the Leve13 Downstream Drainage Analysis. The culverts, idendfied as P 116 and P 117 in the drainage analysis, were predicted to flood at a 2-year retum period. Flooding at these culverts could create a backwater condition in the ditch,thereby causing water to sheetflow onto Mr. Bowden's property, as'did occur when the ditch was blocked. T'his type of flooding would likely be classified as a"nuisance" problem by the King County Surface Water Design Manual. � Complaint 97-0203, Claim 31249, and Claim 21860 relate to flooding that has occurred Iat the residence located at 14028 160th Avenue SE. Flooding at this location has been a recurring problem. Both 160th Avenue SE and a residential structure are subject to flooding. On at least two occasions in the past,the culverts in front of the property have overtopped. When flooding occurs, stormwater flows down the driveway and into the garage and ground level floor of the home. This problem is considered both a"severe building" and a"severe road" flooding problem by the King County Surface Water Design Manual. The Leve13 Downstream Drainage Analysis predicted flovding occurs in front of this residence at a 2-year retum period. Flooding is caused by undersized culverts at locations P 113,P 114, and P 115. Complaint 97-0318 and Claim 21699 were filed by the property owner located at 14038 156th Avenue SE. A 12-inch diameter inlet pipe to a conveyance system, identified as j P001 in the Leve13 Downstream Drainage Analysis, is located in front of the j complainant's property. Stonnwater in the easterly ditch of 156th Avenue SE overtops � the 12-inch diameter inlet pipe and flows down the owner's driveway and into her i basement. Flooding has occurred on more than one occasion and has resulted in damage � to the owner's washer, dryer, and water heater. This flooding problem is considered a � "severe building" problem by the King County Surface T3'ater Design Manual. Based on � the Leve13 Downstream Drainage Analysis,the 12-inch diameter inlet pipe in front of � the property is predicted to overtop at a 2-year return period. i Lastly, a "severe" channel erosion problem is located in the downstream system on the east boundary of the property located at 16046 SE 142nd Place. The channel is within the right-of-way of SE 162°�Avenue. Channel bank erosion that is occurring at this location could be depositing in a flat section of channe150 to 100 feet downstream from the eroded azea. Sediments in the channel could be contributing to flooding as documented in Complaint 97-0206. In my field visit of the site,Mr. Don Gragg,the property owner, described flooding that impacted his garage in the past. A 4-inch pipe drains a catch basin in the driveway neaz the garage. The invert of this pipe is only 1.4 feet above the bottom of the channel. It appears that when the channel fills, water backs up in the pipe and �loods Mr. Gragg's driveway and garage. Minor channel improvements at this location would likely improve the existing flooding/erosion and sedimentation problem. Altematively, cbanges to the configuration of the 4-inch diameter drain pipe could prevent further flooding of the driveway and garage. O Mr. Mike Romano December 5, 2002 Page 4 Proposed Mitigations Leve12 detention standards are required on the Evendell site, and were included in the preliminary drainage plan for the proposed plat. Prior to receiving recently released flooding information from DDES, described above, we had considered the flooding to be a"nuisance" problem and did not propose mitigations in addition to the Leve12 detention ' standards. In light of the new information, additional stormwater mitigations will be � needed as part of the Evendell Drainage plan to conform with the King County Surface � R'ater Design Manual. Draina�e Problems at 13814 and 14028 160'"Avenue SE For the severe flooding problem at 14028 160'� Avenue SE, I recommend upgrading the � downstream system as opposed to adopting onsite Level 3 detention standards. In my opinion, in this situation, upgrading the conveyance system along 160th Ave SE by eliminating constrictions, would provide more benefit to the neighborhood and surrounding properties than would adopting a more stringent onsite detention standard. By upgrading the system, the existing "severe roadway" flooding problem would be fixed, as would the existing "severe building" flooding at the residence located at 14028 160th Ave SE_ Proposed upgrades would also solve the nuisance flooding problem at 13814 160`�Avenue SE. While adopting onsite Leve13 detenrion standards would conform to requirements in the Surface Water Design Manual, only conveyance upgrades would fix the existing problems. Pipes that would need to be upgraded would include the following: ■ Two driveway culverts on the west side of 160th Ave SE (P 116 and P 117) ■ Cross culvert under 160th Ave SE (P115) ■ Culvert immediately upstream the property at 14028 160th Ave SE (P 114) ■ Existing 18-inch diameter pipe at 14028 160th Ave SE (P113) Upsizing these pipes would prevent the ditch from overtopping. Stormwater would be contained in the roadside ditch and would not be allowed to flow across the road or onto adjacent properties, as has occurred in the past at 13814 and 14028 160`�Avenue SE. Draina�e Problem at 14038 156�Avenue SE For the severe flooding problem at 14038 156`�Avenue SE, either onsite Level 3 . detention standazds could be adopted in place of Leve12 standards or the capacity of the existing 12-inch inlet pipe could be increased. Increasing the capacity of the 12-inch inlet pipe would likely entail upsizing at least 115 feet of 12-inch diameter pipe. By upsizing this reach of pipe to 18-inch diameter and increasing the head above its crown at the inlet, the capacity of the inlet pipe would be increased. The frequency of flooding would be reduced from a 2-year return period to approximately a 10-yeaz return period. � Mr. Mike Romano December 5, 2002 Page 5 Draina�e Problem at 16046 SE 142°�Place For the severe erosion problem along the east boundary of the property at 16046 SE 142°� Place, the proposed Level 2 R/D standards provide the mitigation required by code. Other types of mitigations to reduce erosion at tlus location, such as bank stabilization in the eroded section of channel or Level 3 R/D standazds, can be imposed through the King County Surface Water Drainage Manual under certain circumstances. Cleaning sediment out of the flat section of channel and stabilizing the eroding banks immediately upstrearn would reduce flooding to the driveway and garage at 16046 SE 142°�Place. Aiternatively, the owner of the property could explore the possibility of retrofitting the outlet of the drainpipe from his property with a flap gate or extending the outlet of the pipe an additional 80 to 100 feet downstream to where the flood water surface in the cbannel is below the upstream invert of the pipe. Impacts of Mitigations on Downstream Properties I do not believe that upsizing the conveyance pipes alvng 160`�Avenue SE would aggravate flooding that occurs further downstream. The amount of runoff that flows out of the constricted ditch during floods along 160"'Avenue SE is enough to cause damage to affected properties. However, containing this water in the conveyance system would likely not result in a substantial increase in flow rate. Furthermore,because the storage volume in the roadside ditch is relatively small and provides insignificant attenuation, upsizing the pipes as proposed would not result in an increased flow rate at the downstream end of the improvements. If you have questions regazding these analyses or need additional documentation,please do not hesitate to call me. Sincerely, C.�k)cr r� � ��CQrf'�( _/• J �/ Edward McCarthy, Ph.D. P.E. � Hydrologist �8 Mr. Mike Romano December 5, 2002 I Page 6 References Haozous Engineering, August 26, 2002. Evendell Plat—Leve13 Downstream Drainage Analysis. Renton, Wash. Haozous Engineering, June 15, 2001.Evendell Plat—Preliminary Technical Information Report. Renton, Wash. King County Department of Natural Resources, 1998. King County Surface Water Design Manual. Seattle. � � � 79 . - �XyIB/T" L � Kin�County . Departmcnt of DeveloPment t�E C E 1 V E U and Environmental Services 9000a1:csclalcAvenucSou�h�n�est DEC D 2 2002 Kenton,�NA 9tSO5Fi-1219 November 27, 2002 �M� Mr. Wayne Jones Lakeridge Development, Inc. P. O. Box 146 Renton, WA 98057 RE: Liberty Plat, A02P0151 Wetland Determination , Dear Mr. don�s: I revi�wed the Wet�and Evafuation and De(ineation Report and Wiid(ifie Habitat Evaluation for the "Liberty Ridge° property, prepared by Habitat Technologies, Inc., dated November 5, 2002. I met Mark Heckert of Habitat Technologies at the site on November 25, 2002 and walked the property and suRounding areas. I also reviewed aerial photos in the County files, from 1936, 1970, 1985, 1990, 1996 and 2000. I confeRed with several of my colleagues on interpretation of the Sensitive Areas Code in relation to this property. The site consists of two properties, separated by 160�' Avenue SE. Parcel A ; (3664500141) has apparently been filled many years ago (prior to 1985) with � ditches installed around the west, south and east sides. The property is maintained as lawns and landscaping with a residence and shop. There are neither wetlands nor streams on this parcel. Parcei B is two tax parcels (1457500085 and 1457500090). The northeastern portion of this site is forested upland. The remainder of the property is pasture with a few structures and outbuildings. A central drainage through the site was ditched across the property following recent construction of three residences to the northwest. This conveyance has some wetlar►d characteristics through the logged area, then is ditches across the pasture. An eastern drainage outlets from a culve�t under SE 136�' Street, conveying stormwater runoff from the roads, lawns and roofs of a pre-1970's subdivision to the north_ This drainage has some wetland characteristics through the forested area, then is ditched ` through the pasture. These drainages are excavated through upland soils, and are neither used by salmonids nor convey a stream that was naturally occurring prior to construction. Therefore, they are neither jurisdictional wetlands nor streams. � �� . � TO: Mr. Wayne Jones � � RE: Liberty Plat, A02P0151 November 27, 2002 Page 2 However, the wetland on the south-central portion of the site appears to have been present since at least the mid-1980s. The eastern ditch is evident in the 1970 aerial photo, conveying water from the culvert under SE 13fi�' Sfreet since that time. Thus, the source of hydcology to the wetland from the culvert is the "normal circumstance" for that wetland. This wetland on the south-central portion of Parcel B meets the criteria for a Class 3 rating_ The wetland and a minimum 25-foot buffer must be protected through the subdivision process by placement in a Sensitive Areas Tract. The wettand buffer width could be averaged, as allowed in Code and Administrative Rule, wiih enhancement of the wetland and buffer provided as compensatory mitigation. The wetland's hydrology must be protected through the subdivision process. This could occur by conveying the flows from the culvert underneath SE 136�' Street across the site, either in pipes or aboveground, and outletting into the wetland through a dispersal system. Alternatively, equivalent hydrology could be calculated and �ossibly provided from roof�rainage from surrounding structures. The stormwater runoff from the three new residences to the northwest is not required to be conveyed to the wetland as this is a recent new input to the wetland. The wildlife habitat survey may need an addendum prepared during early spring, to determine whether any of the nests observed on-site are used by species that require protection under the King County Comprehensive Plan. This property is within the Urban-designated portion of the County, so the few species that require protection include state and federal endangered, threatened or sensitive species, and certain raptors and herons. Please let me know if you have any questions or would like to discuss this further. I can be reached at (206) 29fi-7291 or laura_casey(a�metrokc.qov. Since ly, �� Lau a C. Casey �� Environmental Scientist— Ecologist Critical Areas Section Cc: Mark Heckert, Habitat Technologies, Inc. ` Steve Bottheim, Supervising Engineer, Critical Areas Section 8� P.O. BOX 1255 FALL CITY,WA 98024-1255 CELL:206-227-8187 FAX:425-228-7232 CASEY ENGINEER�TG �l�f'W'�H��cT� Q'�,�� t�� ,�� 'O y W" f- � `G ._ November 20, 2003 t► _ 26a7� Bruce Whittaker, P.E. //Zy-� ��•��'�' L.U.S.D. ��-� King County D.D.E.S. �P�Es ,�=/3-oS REFERENCE: Liberty Grove Contiguous, L03P0005, (L03TY401) and Liberty Grove, L03P0006, (L03TY403) SUBJECT: Response to November 12, 2004, Plat Screening, Request For Additional Downstream Information Dear Mr. Whittaker: The following is a narrative of the existing downstream system from the Parcel "B" portion of the Liberty site to the Petrie Property. A. Description of stormwater drainage within the Parcel '�B" portion of project: The stoRnwater generated from the site'in the existing condition and any stormwater that enters the site from the north (SE 136th St.) flows to an existing wetland at the southem central portion of the property. The wetland is shown on the preliminary plat. Stormwater leaves Parcel "B"at the low point of the wetland and flows to the south. It should be noted that the wetland is not a closed depression. B. Description of Stormwater Drainage Across Property#1: Tax Parcel#: "0095" 13802 160�' Ave. SE Steve &Joanne Lee This property is located directly to the south of Parcei "B" of the proposed development. Permission was granted by the property owner to cross this property. Stormwater leaving Parcel"B" (under a wood fence) enters Property#1 and is intercepted by a constructed swale (sump). See Picture#2 that is taken from the STORMWATER f�'DRAUIIC ANALYSIS CIVIL ENGINEERING DESIGN T�1ND PLANNING �2 North end of the swale looking south. The swale (sump) is approximately 15' wide and 28' long. At the south end of the swale there is a 12" Concrete Pipe (CP). The top of the existing grade around the swale is approximatefy 3.5'above the IE of the culvert. The culvert conveys stormwater across this property to the adjacent property to the south. Within this property there is also an additiona! swale that flows into the above mentioned sump. The swale is to the south of the Parcel "B"fence and begins approximately 50'east of the southeast corner Parcel "B". This swale intercepts stormwater leaving the Parcel "B" property and directs the stormwater to the west to the sump feature. Picture #1 is taken to the east of the sump, looking to the east. This swale is approximateiy 10'wide and 2'deep with gentle side slopes. The swale is grassed and is stable. C. Description of Stormwater Drainaqe Across Property#2: Tax Parcel#: "0096": 13814 160�' Ave. SE Brett Bowden. Mr. Bowden granted permission to cross his property. Reach l: A 12"CP conveyance system outFalls from Property 1 to Property 2 adjacent to a large cottonwvod stump. The pipe d�scharges into a short swale/ditch that is approximately 8' long and 3'wide. The swale is approximately 3'deep with varying side slopes and appears to be stable. At the end of the swaie is a 12"CP pipe that conveys stormwater under a gravel road. The IE of the CP to the top pf the gravel road is approximately 2.5'. Reach 2: Stormwater leaves the 12"CP under the gravel road and enters a broad swale. Picture#3 was taken near the upstream culvert under the gravel road looking to the south. The swale is approximately 110' long, 3'wide at the bottom, approximately 3'deep with varying side slopes. The swale ends at another gravel road. There is a 12"CP at the southern end of the swale where the water is conveyed under the gravel road. Picture #4 was taken at the southern end of Reach 2 looking to the north. D. Description of Stormwater Drainage Across Property#3: Tax Parcel# "0101": The property owner was not home and a card was left at the front door. Reach 1: Stormwater leaving the 12"CP under the gravel road from Property 2, discharges into a shallow ditch on the north side of the driveway access to the Property 3 residence — see Picture #5. The ditch flows for a short distance to the south and then tums to the west—see Picture #6. At the westem terminus of the ditch, stormwater is intercepted by a 12"CP that conveys stormwater under the driveway to the south. Picture #7 shows the outfall at the southem side of the gravel drive. The ditch is approximately 2'wide, 1'deep with varying side slopes. There was approximately 2'from invert to tfie top of the gravel road. There were no observed capacity issues within this reach. � Reach 2: I Stormwater leaving the 12"CP under the gravei road for Property 3 enters a cleariy ' defined channel/swale that varies in width from 2'to 5'with side slopes from 3:1 to flatter. This channel flows to the southeast. Near the southem property line of this parcel, the channel transitions to a wide, broad swafe that matches the existing topography of the land. The identification of a clearly defined drainage feature at this point cannot be distinguished. There are no identified capacity issues within this reach. E. Description of Stormwater Drainaqe Across Properties#4 &#5: Tax Parcels # "0100"&"0116": There was no attempt to contact property owners for this portion of the downstream analysis, as the houses were quite a distance to the west from the area of interest. Stormwater leaving Property 3 enters into a very broad area with no defined drainage features. The ground slopes gendy to the southeast. The majority of this area is covered with alders, salmonberries, vine maples and law groundcover. The ground is hummocfcy. There are tree blow-downs and debris from historic logging activity. The logical direction that stormwater would flow was followed to a point that terminated at an east/west dirt bike trail. There was no defined channel across this traif. It is assumed that this trail was within Property#5. Within this area, there were many dirt bike trails meandering every which way. A route was chosen (to the southeast) to continue the investigation through an area that appeared to be where stormwater would flow in the absence of the dirt bike trails. This route led to an old stream channel. The channel was meandering with a rocky bottom and no water. This channel is within the southeastem portion of Property#5. This channel was fotlowed to a point where it entered Property#6. There are no identified capacity concerns within these properties. F. Description of Stormwater Drainage Across Property#6: Tax Parcel# '�0110": The property owner was contacted for this report. Stormwater enters Property#6 appro�cimately 120'west of the northeast east/west fence line that is assumed to be near the property corner. At this location, there is a 4' high field fencing with 2 strands of barbwire on the top. There is old pink survey flagging attached to the centerline of the stream with the notation "CL Stream". The stream continues to the southeast through the property and leaves the site approximately 80'south of the northeast fence comer. The stream within Property#6 is within a wide broad channel with varying side sfopes. There are no identified capacity issues within this properly. Attached is the following information: 1. Copies of photos descnbed in this report. g�- ', e • � rya�� !��' � � ��:'� I �p�+ �. � •' N��,: »�,t' ' ik. . ti�4� ,w • �� M �1"' '• .� "� 1 � , � ' .. � z • �.. .. . �� • �.�'.f�. ` a .� 1 . • ",C'1�M" ' i•+ .i` . 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'�' v „J i ;;��oYb,: ,(.,♦ ,M�+, '��.`�.�"�,�< -'� � ,�. :y,` iw v: d . , •. , , _, � r;n-.ti rr r! ." ,'k� r,M r.�v�� ;r;: � rc � �,{i , X a;r�.� .^t .. ,. . . . .' � �� ai.x �� i �r z }�V�'�y,�.rV,,��.f,,�� d.. 4��M� '� ,.� -��;�.`; ;�.. „', • �� . . . - . .v�, � . � .�.�:.� ,;. , .. � ��'/) .. � �.. � 4 ' ' ' ' . y . �� ( �f, �t e�,y yI};�`�M�� t ��1�� , �q"� �Yn. �k�� ' - y 1F � �arsfl M *�M '� �fF R 1� .\ _ aRr �.s i W ytS.. y� ��y f�� .<'�:�'�r� . �A ,� ' a'�.�'t1 � t.. . .. �r� r f ��,��i . . � f. `.' .� .�tC �4;"q'� ..1�.f.QX' +h��7 t� u �" . � , „ .. ,��: �„ .�i.� .,. ,�'- . . ,. � . 4 y .�� 5.... .�,r � _ � SECTION IV FL4W CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN � , I i i _ , - I i . � I I f � ,,T� _ _ ,�> . ,�� . . � EXISTING STTE HYDROLOGY(PART A) The proposed Liberty Grove and Liberiy Grove Contiguous developments will be within three separate pa.rcels, located near the northwest and southeast corners of the intersection of SE 136`� Street and 160`�Avenue SE. Liberty Grove is within Parcel 3664500141, � which is located near the northwest corner of said intersection. Parcels 1457500085 and 1457500090, which are located near the southeast corner of the previously mentioned intersection, is where Liberty Grove Contiguous is located. The parcels are within the NE and SE quarters of Section 14,Township 23 North,Ra.nge 5 East, Willamette Meridian, in King County Washington The project site is located within an area zoned R-4. Since both projects will be developed at the same time,and in fact will share the same detention facitity,this T.I.R. anaiysis will be for both projects. There is an e�sting house and shop within Liberiy Grove,with the remainder of the site mostly covered with grass and some trees. Liberty Grove is approximately 4.84 acres and generally drains to the south. 'There are two houses within Liberty Grove Contiguous, with associated structures. The 7.92-acre parcei is presently forested in the northeast corner, with the remainder of the site being dominated by pasture land There is a wetland area within the southwest comer of Liberty Grove Contiguous, which will remain,and will be protected by a 25-foot buffer. Runofffrom Liberty Grove Contiguous either drains irrto the existing wetland, or irrto the drainage facilities along 160�Avenue SE. Runoff from both developments, as well as the upstream areas, converges downstream. Site soils have been identified as Alderwood gravelly sandy loam by the U.S. Soil Conservation Service(SCS). � Liberty Grove and Liberty Crrove Contiguous both have upstream areas that contribute flows through the site. The time series for the upstream areas were deterrruned and added to the time series for Liberty Grove and Liberty Grove Contiguous to determine the allowable release rates for the proposed stormwater facility. The following pages include the existing condition basin maps for both developments, as well as, the upstream areas. Also included are the peak flows from each area and the combined peak flows from all the areas. The combined peak flows will be used as the allowable release rates for the new detention facility. � � I I I I I � � "' � � � '�F r- � I � � � i � .._.,.� � � 1 I I 1 I I 1 � ' � I��jpI1 �� •---- � I � P � I I ;' _� � 1� � � � � � � ' �� r•...��.�..�J �.��1=4 4 J I I �. , ' � � . I_._._.J.�.1J...�-l_..--_L._-......J . �I�_ _......................._...--•-�J.._.. �•-' i �,��"" � � � `w .`� 'ir� ..« "'�, s-r�r..- _.�..1.. � � (ONiBI � r ,'.,,,!' ,,=__t,�----':�_„�'�'r,- � •C , _.�--.".... �._......�...__ 9e anr aua�l � � v ..._.. � �'��"=�• � _—_ � . �""" ,��' 'F" ��`__ � ,� o O , � ~� � •' � ~'.'' �r� � � t 1 �� r _ � � ' � � i _�..r r '�'� ! 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I 1 � � . �I �..._ I � I � � I I i � r--•� ., i � I I � � � ! ! � LJL'�f2TN C�fZD t/E KCRTS Cornmand P2E-nEvEl�oP� cnN��r�on CREATE a new Time Series ------------------------ Producti on of rtunoff Ti rne Seri es �roject Location : Landsburg Cornputing 5eries : a:lgpre.tsf rtegional scale Factor : 0.80 �ata rype : tteduced CreatTng Hour�y Time SerTes File Loading Time Series File:C:\K�SWDM\KCRTS\LATF60R.rnf 8 Till �arest 0_30 acres Scaling Yr: 8 Loadi ng Ti r�e Se ri es Fi 1 e:C:\K�SWDM\KCRTS\LATG60R. rn f 8 Till �rass 4.59 acres Adding Yr: 8 Loading Time Series File:C:\KC_SWDM\KCRTS\LAE160R.rnf 8 Impervious 0.14 acres Adding Yr: 8 Total A�ea : 5.03 acres Peak �ischarge: 1.34 CFS at 7:00 on �an 9 in Year 8 Storing T�s�e Se.rles File:a:lgpre.tsf 8 Time Series Computed FIOw Frequency Malysis Time 5eries File:a.l pre.tsf Project tocation:�an�sburg ---nnnual Peak Flow Rates--- -----Flow Frequency Malysis------- � �low Ftate Etank Time of Peak - - Peaks - - �tank Return Prob (CFS) (CFS) Period 0.628 3 2/09/OI 2:00 1.34 1 100.00 0.990 0.197 8 1/05/02 16:00 0.756 2 25.00 0.960 0.378 5 2/28/03 16:00 0.628 3 1Q.00 0.900 0.443 4 8/26/04 1:00 0.443 4 5.00 0.800 0.335 6 1/05/05 10:00 0.378 5 3.00 0.667 0.335 7 10/22/05 17:00 0.335 6 2.i�(3 0.�00 0.756 2 11/21/06 9:00 0.335 7 1.30 0.231 1.34 1 1/09/08 7:00 0.197 8 1.10 0.091 I Computed Peaks 1.14 50.00 0.980 NOTE "r�ToT�tL t�PJ�U)D(�..5 A/L�A �QUALS l).3� /4C Z� FF�-�c-r,v� rMOE2U/eLc.<S �IfL�A�C flULlLS p.3�X 0,� � a.iy ,�� lJ ��r�Ty ��` KCR75 Co�nand C�/UTl G CJD LG S ------------- C�tEATE a new Ti me Se ri e� P/T� -!�(/Fl_� Fr' PF'OdllCtlO[t O� --r_.-_ -- - �roject.Locat�on : La�sburv comp�t�ng Series : a:lgcp ttegio�al Scale �actor : 0.8�. oata rype . Reducec Creating HasrTy T�me Serles Fi � _ Loading Tirile Series Fiie:C:\KC SWDM\KCRTS\LATF60R.rnf 'ti 17 Farest 2.40 acs�es scal i ng �r: 8 Load�ng Ti me Se ri es Fi 7 e:C\K�SWDF�1\KCRTS\LATP6UR.rnf �i 11 �asture 4.39 acrEs acidi ng Yr: 8 �oadi ng 'ri me Se ri es �i 1 e:C:�K�SwDM\K�RTS\LATG60R.rnf TiiZ 6rass 1.00 acres Adding Yr• 8 Leadi ng Ti me Seri es F11 e:e'`K�.SMI0�1�KCttTS\�AEZ6QR.�nf I�perviaus Q.12 atres Adding Yr: 8 Tota7 Area : 7.91 acrQs Peak Di scf�arge: 1.19 CF5 a�t 7:00 on 3an 9 i n �ear 8 S�aring �isne series �i3e:a:lgcpre.t�f 8 T-ime Series �omputed �7ow Frequency Ana�ysis Time 5erie5 F-sie:a.lg+cp re.tsf Qroject Location:Landsburg � ---nnnual Peak Flo�r Rates--- -----F�ow Freq�ency Anal�sis------- �7aw Rate rtank Time of Pea�C - - �eaks - - Rank ateturn Proia (CFs) (cFs) Per�od 0.559 2 2/09/O1 14:OQ I.19 1 lOQ.00 0.9�30 �.i71 8 1J05/U2 1f:00 0.559 2 25.00 O.g60 0.446 4 2/28/03 15:00 U.542 3 10.00 0.9t)0 Q.313 7 $f26/04 1_OG u.446 4 5.00 0.8�0 0.�413 5 3/OS/95 10:00 0.413 5 3_00 0.6fi7 0.329 b 1/18/06 21:Q4 0.329 6 2.fla 0_50� 0.542 3 11/21/06 J:00 0.313 7 3..30 fl.231 i.ig i 1/o�lc�s 7=c�v o.i�� s 1.20 0.o�i C�erputed Peaks 1.0I S0.00 0.98t? NoT�: r.� TaTAL f M PElLL/O l�,S A�2C�4 = 0� Z 9 A c 2.� �FF�cr�v� ��,P�,��s �� = o.2� x o, � = a , �z ,�� T�F�� xcRTs command ��T� aF L/6�2fy C�l�� vE CREATE a new Time Series ------------------------ Production of ttunoff Time Series Projett,LocatiOn : Landsburg comptst�ng 5eri es : a:�sl g,tsf Regional Scale Factor : 0.8U �ata Type : Reduced creating trourly Time Series File Loading �'7me Series File:C:\KLSWbM\KCRTS\LATF60R.rnf 8 T�11 Farest 0.23 acres Scaling Yr: 8 �oading �ime Series FiIE:C:\KC.,_SWDM\KCRTS�LATG60R.rnf 8 Ti17 Grass 1.64 acres Adding Yr: 8 �oadi ng 'ri ree Ser�i es Fi 1 e:C'\K�SYVENN\KCRTS\LAE160R. t'nf 8 Irnpervious 0.63 acres Adding Yr: 8 -------------- To�al nrea : 2.50 acres Peak �ischarge: 0:739 CFS at 7:00 on 7an 9 in Year 8 Stor�ng Time Series �ile:a:u�g.tsf 8 Time Series Computed �+aw �re�uency An�iysis T�me Series File:a:ulg.tsf R�oject t�acation:�anclsburg ---Annual Peak Flow Rates--- -----Flow Frequency Ana7ysis------- � Flqnr Rate ttanic Time of Peak - - peaks - - Rank Return Prob (CFS) (CFS) PeriOd 4.378 3 2/09/Ol 2:00 0.739 1 lOQ.QO 0.990 0.�.73 8 32/�3/�1 17:00 0.453 2 25.00 0.950 0.257 7 9/10/03 I5:00 0.378 3 10.00 0.900 0.354 4 8/26/04 i:00 0.354 4 5.00 0.800 0.284 6 10/28/Q4 18:Q0 0.�91 S 3.00 0.667 U.291 S 10/22/05 17:00 0.284 6 2.00 0.5�f3 0.453 2 11J21/06 9:OQ 0.257 7 1.30 0.231 0.739 1 i/i}9/D8 7:Q0 0.173 8 1.14 0.091 �omputed Peaks 0.643 50.00 0.980 ;UarE; l.}A2EA �5 �tAs Zp��GA o� z5 % �,tioE�ur�ou�s. 1.� G�ss d Fo�ST cn��1Z .�Ssurv�E� �,vD a�SED on/ FiECD vis�-.s o� k�n�� co�,��y �MaP. O vPsr�,ar1 6�s�n� � KcrtTs Canmand /IJ02%f� OF L�6�2T�9 G�DVE C�t�zE a new Ti me�se ri es G'��G UDC.z� Production of Runoff Time Series Pfi'OjeCt.tOCatlO►'1 : Ldnf�S�UY`9 Comput�ng Series : a:uplgc.tsf Regivnal scale Factor : 0.8Q Data Type : Reduced Creat-ing Hourly Time Series F�le Loading Time Series File:C:\K�SwDM\KC�zTS\I.ATG60R.rnf 8 Ti�l Grass 0.61 acres Sca�ing Yr: 8 �oadi ng Tl t11e se ri es Fi 1 e:C:\KC_SWDM\ICCRTS\LAEZ 60R. rnf 8 rmperv�ous 4.34 acre5 Adding Yr: 8 Total nrea :T fl.95 acres Peak �ischarge: 0.3i3 �FS at 7:00 on �an 9 in Year 8 � Storing 7ime Series File:a:uplgc.tsfi 8 Time Series Computed Fl ow f requency Anal ysi s Time Series FiTe:a:uplgc.tsf Project tatation:tiandsburg ---Annual Peak Flow Rates--- -----Flow Frequency nnalysis------- Flow ttate Ra�k Time of Peak - - Peaks - - �tank rteturn Prob (CFS) (CFS) Period � Q.i63 4 2/09/O1 2:00 �.3�3 1 100.Q0 0.99Q 0.083 8 12/03/O1 17:00 0.197 2 25.00 Q.960 0.129 7 9/10/03 15:00 0.167 3 10.�Q 0.900 0.167 3 8/26/04 1:40 0.163 4 5.00 0.800 0.135 6 10/28/04 1.8:00 0.139 5 3.Q0 0.667 0.139 5 10/22/Q5 i7:U0 0.235 6 2.00 0.5Q0 0.197 2 11/21/06 9:00 0.129 7 1.30 U.231 0.323 1 �./0�/OS 7:00 0.083 8 1.i0 0.091 computed Peaks 0.274 50.00 0.980 IUDTE: /.) AeFA HAS APPfLextM�TEt��f 3.t6 �vI6A a� .35. 3�� ihPE2vioc�s, � �i2E- D�[l�L DPEn CDAI t�lfifON Conc��N�O Ti�i�" S�2r�S L�t3ER-7`! G rlo�E KCRTS Command ��7t,f ��j�E"��r/�� aoa Ti me se ri es t j�S'-f�i2F�q�vj � LIL'tLclZj''j GIZOU� --------------- Addi ng Time seri es U��AM Tb L I,a�2 Ty G/l01/� Co�l'I. Computing Series:a:pre.tsf �oading Time Series �iie:a:�gpre.tsf 8 Peak Flow rtate: 1.34 CFS at 7:00 on 7an 9 in Year 8 Lag= 0.00 Factor: 1.00 �oading Time Series File:a:lgcpre.tsf 8 Peak flow rzate: 1.19 CFS at 7:00 on 7an 9 �n Year 8 �ag= D.00 Factor: 1.00 Completed Yr- 8 �oading Time Series -�iTe:a:ulg.tsf 8 Peak F�ow Rate: 0.739 CFS at 7:00 on 7an 9 in Year 8 �ag= 0.00 Factor: 1.00 Canpleted Yr: 8 �oading 7�ime series File:a:uplgc.tsf 8 �eak Flow Rate: 0.313 CFS at 7:OQ on 7an 9 in Year 8 La� 0.00 Factor: 1.00 �ompleted Yr: 8 Qeak �low �tate: 3.58 C�5 at 7:00 on �a� 9 in Year 8 Flow Frequency Analysis Time series File:a:pre.tsf �roject tioc�tion:tiandsb�srg ---annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate ►tank Time of Peak - - Peaks - - rtank �tetur-n Prob (CFS) (C�S) Pe riod 1.78 3 2/09/O1 2:00 3.58 1 100.00 0.990 0.590 8 1/05/02 16:00 2�05 2 25.00 0.960 1.16 5 2/28/03 16:U0 1.78 3 30.00 0.900 1.2$ 4 8/2b/04 1:00 1.28 4 �.00 O.SQO 1.06 6 1/OS/05 10:40 1.16 5 3.00 0.657 0.998 7 10/22/05 17:00 1.06 6 2.00 O.SOU 2.05 2 11/21/06 9:OU 0.998 7 1.30 0.231 3.58 1 i/09/08 7:00 0.590 8 1.10 0.091 Computed Peaks 3.07 50.00 0.980 �,�E'D�t��LDP�D I�ELEAS C �AT�S IN�2l�AL S��E = C 3.0� - r•O6/2 �YC 3�- �) _ �. 073 �/�ST INTL�lLrIAL = � 1,o6�Z� = 0�53 0 w '� � . - . - . � . � -.e i . '4�. _'hfi2' . . � � . �f.;:�. _ . ' . . . . . .. , �.� DEVELOPED CONDITION HYDROLOGY The two developments involve the creation of si�y single-family residential lots combined. Access roads and madway impro�ements wili also be part of the development. The detention facility will be constructed in the sautheast comer of Liberiy Grdve Contiguous, and wiil serve both developments. A wetpond, sized per the Basic Water Qua.Iity Menu, will be constructed below the detention facility. Discharge from the Qond will be ta the u�graded conveyance facilities aiong the east si�e of 160�'Avenue SE. The wet�and area will remain, and will be protected by a 25-foot buffer. It is proposed to convey nuioff from Liberty Grove to the stormwater facility within Liberty Gro�e Contiguous. However, since off-site runoffcollected by the ditEh along 158'�Avenue SE wili enter the praposed facilities along�SE 136`�Street,there �ill be some bypass areas in order to prevent additional off-si#e runoff from entering the , proposed facilities. The bypass areas include improvements to SE 136�Street(south af , LiberEy Grove)and a small area near the southwest corner of Liberty Grove Contiguous. ! The bypass areas within the R.O.W. will have a total new pollution-generating I impervious surface o�appro�uma#ely 12,310 sq.ft. In order io mirigate for the untreated a.reas,we wiil collect existing untreated pollution-generating impervious surface aion� 160�Avenue SE fronting the two sites. T'he total existing area being picked up is appro�mately 8,560 sq.ff. of PGIS. This wiIl leave approximately 3,750 sq_ft. of ne« PGIS. However,per Exemption# 1 of CorE Requirement# $,if the�ted PGIS i less than 5,000 sq.ft.,then it is exempt from the water quality requirements. Since th� ' on-site areas will be increased by pieking up additiona� impervious areas along 1b0'� Avenue SE,the bypass areas within the RO.W. will be reduced by the same amount so th�t the total pre and post-development areas will balance. A comparison of the total areas is provided as follows: E�sting Condition Deve� Liberty Grove 5.03 Ac Liberty Grove Contiguous 7.91 Ac 7.I8 Ac i 36�and 160`�B}rpass 0.56 Ac m Lot 18-23 Bypass 0.80 Ac Totat 12.�4 Ac 12_94 Ac * Reduced try 0.20 acres to account for exishng untreated areas along i 60 � Avenue SE that were added to Liberty Grove and Liberty Grove Contiguous(Treatment trade area). It is also requir+ed fo mimic the hydrology of the e�usting wetland. In order to approximate e�sting wetland hydrology, it is necessary#o allow some areas of the development to bypass th�detention facility and drain directly into the wetland. Although not a condition of the Drainage Adjustment, it was previously mentioned that a flow splitter will be provide to maintain�isting flows to the wetland and the downstrea3n properties, however, since by allowing some developed lots to drain directly 0 into the vvetland maintains e�sting hydrolagy to the downstream properties, it is not necessary to install an additional stnicture that will serve no purpose�See Analysis of Wetland Hydralogy in this Section). Liberty Grove Comiguous will thea be divided into three sub-basins, which includes the bypass area near the southwest corner of Liberty Grove Contiguous,the basin draining into the pond and the basin for Lots 18—23. The different drainage basiris are shown in the developed condition basin map in the next page. Also included with this section are rhe peak flow ra#es for the different on-site and bypass basins. The time series for the on-site and�pstream areas were ca�nbined and will be routed through#he proposed detention facility, while the bypass areas were added and will be used as tributary flows in the pond sizing calculations. O �, L tBEQry ��vE R/�fA - �.� Ac , +; r ' C�xIS'�!'iN6 f!� ��ar�� l��4A� � ��— � � ---- � � � w, � � '�,�, , �---+--��-�--- �. II ' _==_==.--- --1----,--_— � -- ' �., i - ; � , , �- � ' ' � i 1 i i I � ' N , I r � -- �' � i �R i 1 �___.r-'l i �' � F-_--- I I I 1 I -_ , , �� 1 � ��un, � J ` 1 1 i ! I I I � , , � � srr. ��i ' I 1 I t ... i � � r-� � .--i� � . f . . � � � � � .�';�1 �-� �---� �;--;� ;--L__�i �_� ^:L: i � '� a' ___� + i i i t � '� " ' ' i i i i i i --J � � L- , -- ---��-� -- i� ; ' e _1'__J_ __L' n�C�.' 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' ! i � ------- r---�---- - L�eERry ��ovE cn�rr�6 ua� To l,J�TLaND F/Zor� LoTS �g - L3 A�A -- o•84Ac D�vEt�PL�D CvnJ��na�1 li�SiAt MAI Sc�ac.F- !"= Zno' �o ��l/ELOGED GD1Vl�/TIDnI L�.��2 ry G2�vc KCRTS Command CREATE a new Time Series ------------------------ ProductlQn of Runoff Time Seri�s Proje[t Location ; Landsburg Comput�ng Se ri es : a:ctevl g.tsf Regiona7 Scale Factor : n.80 Data Type : Reduced Creating Hourly Time 5eries File Loading Time Series File:C:\KC_SWDM\KCRTS\LATG60R. rnf 8 T1'il Grass i.35 acres scaling Yr: 8 toading 7ime Series File:��\KC_SWDM\KCRTS\LAE160R. rnf 8 Zropervi�s 3.05 acres Adding Yr: 8 Total Area : 4.40 acres �eak oischarge: 1.68 CFS a€ 7:00 on �an 9 in Year 8 stori ng Ti nEe Se ri es Fi 1 e:a:devl g.tsf 8 �ime Series Computed �low Fr�equer�cy Ana7ysis T�me 5eries �;le:a:�e;r7g.tsf Qroject �ocation:�.andsburg ---Annual Peak Flow itates--- -----Flow Frequerrc�r Analysis------- Fl�w �tate rt�nk Time of Peak - - Peaks - - tzank rteturrr �rob OC945 7 2/09/O1 2:Q0 ��F68 1 �OOr�Q� 0.990 Q.593 8 12/03/02 17:D0 1.14 2 25.00 0.960 1.02 4 9/10�03 15:00 i.14 3 10.00 0.300 I.I4 2� 8/26/04 1:00 L 02 4 5.00 0.800 Q.95U 6 10/28/04 18:00 0.988 5 3.00 0.667 0.988 5 10/22/05 Z7:00 0.950 6 2.Q0 0.500 l.i� 3 ll�21fU6 9:00 0.945 7 1.30 0.231 1.68 1 1/09J08 7:00 0.593 8 1.I4 0:{�91 Computed Peaks 1.50 50.00 0.98fl ND%E � //�?f�11lGt� �/'c�A i al�LJl��.� � ��,�� ,Tr�R�rs, �o�,�r usc �n�v�r�A�� = a.�� GU/�6 S � S/D�GUAL�S �XIS7l�U6 PC/5 AL�iG 1�fJ Tf� �i/� �� " D. 0 J!�C Zy Lo3 @ �.at� SF � • - Z.Z �G 3.D� Ac !� ��EcoPE� �o�uD�nonl Gi��ry G2o�E co�rc�udc�;s KCRTS Command CREATE a new Time Series ------------------------ Production of rtunoff �ime series Project_�ocatiort : �andsburg Comput�ng Seri�s : a:devlgc.tsf Regiona7 Scale Factor : 0.80 �ata Type : rteduced Creating Hourly Time series File Loading Time Ser�es File:�:\K�SWDM\KCRTS\LATG60R.fnf 8 Till �rass 3:04 acres Scaling �r: 8 Loading Time Series File:C�tKC SINDM\KCRTS\i..AE160R.rnf 8 Impervious 4.14 acres Adding Yr: 8 Total Area : 7.38 acres Peak Discharge: 2.61 CFS at 7:OQ on 3an 9 in Year 8 s�oring Time series File:a:devlgc.tsf 8 Tiroe series �omputed Flow Frequency Analysis �ime Se:ies �iie:a:devTgc.tsf P�oject tocation:tandsburg --��►nnual Peak Flow Rates--- -----Flow Frequency Analysis------- �1 ow rtate ttank 7�i me of Peak - - Peaks - - ttank ttetu rn Prob (tF5) (CFS) Pe ri od 1:43 4 2/09/O1 2:00 2.f1 1 100.00 0.990 0.849 8 12/03/O1 17:00 1.73 2 25.00 4.960 1.43 S 9/10/03 15:Q0 1.66 3 �0.00 0.900 1.66 3 8/�6/04 1:00 1.43 4 5.00 0.800 1.37 7 10/28/04 18:00 1.43 5 3.00 0.667 1.42 6 10/22/05 17:OQ 1.42 6 2.00 0.500 L 73 2 11/21/06 9:00 1.37 7 1.30 0.231 2.61 1 1/09/08 7:00 0.849 8 1.10 0.091 Computed Peaks 2.32 50.00 0.980 �vorE: ��r��c��a�s b2EA �ticL��.s : 2o AU � C U R 6S �. S�DEU1/��KS " /• Z$/�� 3o CvTS Ca rfpoU SF E�1. = 2 . 7SAc � �XIST/NC� PGIS A[.oNG /601.N AU SE � O./I Ac 4, /�/�G O ��UEL.I�PE� cdnJD�Ti on1 Tb l.uETL�J� King County rtunoff Time series Program �� Version 4.42a ��'s /8 — 23 ------------------------------------------------------------------------------- KCRTS COmmdnd CREATE a new Time Series ------------------------ Producti on of rtunoff Ti roe Se ri es Project_�ocation : �andsburg Computing Series : a:lots.tsf Regional scale Factor : 0.80 �ata Type : rteduced Creating Hourly Time Series File LOadlhg Tlr11e series Fl1e:C:\KC_SWDM\KCRTS\LATG60R. rnf 8 Till Grass 0.25 acres Scaling Yr: 8 Loading Time Series File:C�\KC_...SWDM\KCRTS\LAE160R. rnf 8 �mpervious 0.55 acfes Adding Yr: 8 Total Area : 0.$0 acres Peak �ischarge: 0.305 cFs at 7:00 on 7an 9 in Year 8 Storing Time Series File:a;7ots.tsf 8 Time Series Computed F7ow Frequency Analysis Time series File:a:lots.tsf PPOjEC� LOCdtIOR:�andsburg ---Annual Peak Flow Rates--- -----Flow Frequenty Analysis------- Flow rtate rtank Time of Pe�k - - Peaks - - Rank tteturn Prob (CFS} (CFS) Period '� 0.171 7 2/09/O1 2:00 0.305 1 140.00 0.990 �, 0.107 8 12/03/O1 17:00 0.207 2 25.00 0.960 0.185 4 9/10/03 15:00 0.207 3 10.00 0.900 0.207 2 8/26/04 1:00 O.185 4 5.00 0.800 0.17Z 6 10/28/04 18:Od 0.179 S 3.00 0.667 0.179 S 10/22/05 17:00 0.172 6 2.00 0.500 0.207 3 11/21/06 9;00 0.171 7 1.30 0.231 ' 0.305 1 1/09/08 7:00 Q.107 8 I.10 0.091 j Computed Peaks 0.272 50.00 0.980 ', �LoTF: lM��i�vioU.S QIZEA 1�IC�uU�S ; � (.oTS � �iblx� S,f, = O�SS Ac , ,I l3 Sr 136TH sT a �6o r� AVE sF ,� ypAss .��,�s Kctt7s command CREATE a new Time Series ------------------------ Production of Runoff Time series Project.�ocat-ion : �andsburg Comput�ng Series : a:rowbypass.tsf , ttegional Scale Factor : 0.80 Data rype : Reduced creating Hourly Time Series File Loading Time Series File:C:\K�SWDM\KCRTS\LATG60R. rnf 8 Till Grass 0.38 acres Scaling Yr: 8 �oading Time series File:c:\KC`SWDM\KCR7S\LAE160R. rnf 8 Impervious 0.18 acres Adding Yr: 8 -------------- 7ota1 Area : 0.56 acres Peak Discharge: 0.181 CFS at 7:00 on ]an 9 in Year 8 Storing Time Series File:a:rowbypass.tsf 8 Time 5eries Computed Flow Frequency analysis Time Series File:a: rowbypass.tsf Project Location:�andsburg ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow ttate Rank Time of Peak - - Peaks - - ttank Return Prob (CFS) (CFS) Period 0.093 4 2/09/O1 2:00 0.181 1 100.00 0.990 0.046 8 12/03/O1 17:00 0.113 2 25.00 0.960 0.070 7 9/10/03 15:00 0.094 3 10.00 0.900 0.094 3 8/2fi/04 1:00 0.093 4 5.00 0.800 0.075 6 10/28/04 18:00 0.078 5 3.00 0.667 0.078 5 10/22/OS 17:00 0.075 6 2.00 0.500 0.113 2 11/21/06 9:00 0.070 7 1.30 0.231 0.181 1 1J09/08 7:00 0.046 8 1.10 0.091 Computed Peaks 0.159 50.00 0.980 I�IDT� : IMP�/LUlOt,GS �S�/� //l,lCLU�IES ' Poaos � 51��wacx5 �- CuRt�s = 0.�8 � � � 0, 20 fiG aF P6/S tU�}S 2�i�IDtIEIJ T(� f�GGOUN.T��/Z i �EATM�N T T/�AD� X2EAS 7"HA� Gv E�i4DD�t) Td L�a��i �� v6�-�.� ��v� ��T��u�us � .DE v�co�Fv �atio�r�o n/ Con�a/n/ED i/ME SF2rES L�aE�ry G�Lorl� KCRTS Command (J,(��f ,��if� [�(jf�,�T/��J�,uJ ADD Ti me Seri es (J�Ti2��-'� � [�1�i�� uPSTnFAr� TD ci�3E/l�'�J�/touc�CG� Addi ng 7'i me se ri es Computing Series:a:dev.tsf toading Time Series �i�e:a:ulg.tsf 8 Peak Flow Rate: 0.739 CFS at 7:00 on �an 9 in Year 8 Lag= 0.00 Factor: 1.00 �oading Time series File:a:uplgc.tsf 8 Peak Flow ►tate: 0.313 CFS at 7:00 on 7an 9 in vear 8 �ag= 0.00 Factor: 1.00 Completed Yr: 8 �oading Time Series File:a:devig.tsf 8 Peak Flow rtate: 1.68 CFS at 7:00 on �an 9 �n vear 8 �ag= 0.00 Factor: 1.00 Completed Yr: 8 �oading Time Series File:a:devlgc.tsf 8 Peak Flow ttate: 2.61 Cfs at 7:00 on �an 9 in Year 8 Lag= 0.00 FaCtor: 1.00 Completed Yr: 8 Peak Flow Rate: 5.35 CFS at 7:00 on �an 9 in Year 8 storing Time Series File:a:dev.tsf 8 Time Series addition complete Flow Frequency Analysis Time Series File:a:dev.tsf Project �ocation:�andsburg � ---annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow ttate rtank Time of Peak - - Peaks - - rtank rteturn Prob (CFS) (CFS) Period 2.92 4 2/09/O1 2:00 5.35 1 100.00 0.990 1.70 8 12/03/O1 27:00 3.52 2 25.00 0.960 2.84 5 9/10/03 15:00 3.33 3 10.00 0.900 3.33 3 8/26/04 1:00 2.92 4 5.00 0.800 2.73 7 10/28/04 18:00 2.84 5 3.00 0.667 2.84 6 10/22/05 17:00 2.84 6 2.00 0.500 3.52 2 11/21/06 9:00 2.73 7 1.30 0.231 5.35 1 1J09/08 7:00 1.70 8 1.10 0.091 Computed Peaks 4.74 50.00 0.980 ; , ' � -- � , , � � ; � � /,� /��U�"LOPE"C� L�11/UJ/T/ertJ /3i!}31�.5 �/ZUni cors �S - z 3 KCRTS Command 5C/361N ST caG /60 7/� AlIE S� B�ASS ADD Time Series --------------- ndding 7ime Series computing Series:a:bypass.�tsf toading Time series �ile:a:rawbypass.tsf 8 Peak Flow ttate: 0.181 CFS at 7:00 on 7an 9 in Year 8 �ag= 0.00 Factor: 1.00 �oadinc� Time series File:a:lots.tsf 8 Peak Flow Rate: 0.305 CFS at 7:OQ on 7an 9 in Year 8 Lag= 0.00 Factor: 1.00 Completed Yr: 8 Peak Flow Rate: 0.486 CF5 at 7:00 on �an 9 in Year 8 Storing Time Series File:a:bypass.tsf 8 Time Series addition comp7ete Fl ow Frequency nr�al ysi s Time Series File:a:bypass.tsf Qroject Location:tandsburg ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Fl ow rtate Rank Ti me of �eak - - Qeaks - - rtank tteturn prob (C�S) (CFS) Period 0.264 4 2/09/O1 2:00 0.486 1 100.00 0.990 0.153 8 12/03/O1 17:00 0.320 2 25.00 0.960 Q.255 6 9/14/03 15:00 0.301 3 10.00 0.900 � 0.301 3 8/26/04 1:00 0.264 4 5.00 0.800 0.247 7 10/28/04 18:00 0.256 S 3.00 0.667 0.256 5 10/22/05 17:00 0.255 6 2.00 0.500 0.320 2 11/21/06 9:00 0.247 7 1.30 0.231 0.486 1 1/09/08 7:00 0.153 8 1.10 0.091 Computed Peaks 0.431 50.00 0.984 ,,}:. � h9',: ,:��. .. � . : .. . . . ' . , . . ,_ . . . . . :.,V ,. . . . . _ " . . . - y, . ;,� ��T t- � � � _ /6 - �f'Yh":'t",�.�'x . � . • . � . . . � .. . . . ;,§r �>'�:�x'i PERFORMANCE STANDARDS(PART C� It is required to provide a detention facility sized per the Leve13 F14w Control criteria for both Liberty Grove and Liberty Grove Contiguous. In addirion,condition 2 of the drainage adjustment(File No. L03VOOb5)requires a factor of safety between 10 to 20 percent. The water qua�ity facility is required to be designed per the Basic Water Quality menu. It is also required to mimic the hydrology of the existing wetland(See pages 31 — 37). In order to approa�imate earisting wetland hydrology, it is necessary to allow some � areas o�the development#o bypass the detention facility and drain directly into the wetland. �'he bypass area(Lots i 8—23) was taken into account in sizing the detention facility. Liberty Grove and Liberty Grove Contiguous both have smal! upstream areas that contribute flows through the site{See pages 2, 5 and 6�. The 1 QO-yr peak flow rates for fhese upstream basins were calculated and are beiow 50 percent of the 10�-yr post- development flow rate for the two pr�oject sites. In page 11,the 100-yr post-development peak flow rate far Liberty Grove is 1.68 cfs, while in page S the 100-yr peak flow rate from the upstream area is 0.739 cfs. Ir�page 12 the 100-yr post-development peak flow for Liberty Grove Contiguous is 2.61 cfs, while in page 6 the upstream 100-yr peak flow rate is only 0.313 cfs_ Since the upstream flows are less than 50 percent of the 100-yr post�development flows from the project sites, upstream nenoff can flow through the site. FLOW CONTROL SYSTEM(PART D) � The sizin calculations for the detention facili can be found in es 19 -26. The g tY Pa� required starage volume is 115,Sb7 cu_ft., while the storage volume avaiiable in the detention facility is 135,223 caft. (See page 30A),or an additianal storage of 19,656 cu.ft. It is required to provide a factor of safety between 10 to 20 percen�. The factor of safety is approximately 17.0%. We believe the factor of safety being provided is suffieient since the projects s�t�s are within the Level 2 Flow Control area. T'he pond is therefore way oversized and should not have any adverse effects on the downstream properties and facilities. As previously stated,the bypass area(Lots 18-23)and the R.O.W. improvement bypass along SE 136�` Street and 160`�Avenue SE were taken into account in the sizing of the facility. /7 WATER QUALFI'Y SYSTEM{PAR3'E) The proposed wetpond was designed per the Basic Water Quality menu as required. The wetpond wiI�be constructe�d beneath the detention facility,and was sized for Liberty Grove, Liberty Grove Contiguous and all the associated areas of the development. The sizing ca(culations for the vvetpond ean be found in page 30_ "i'he required size for the first cell is 11,622 eu.ft., while the available storage is i4,287 cu.ft. The required storage volume for�the secend cel�is 27,117 cu.f�.,while the available storage is 29,021 cu.ft. � /8 Retention/Detention Facility Type of Faciiity: Detention Pond Side Slope: 2.00 H:1V Pond Bottom Length: 178.12 ft Pond Botto� Width: 89.06 ft Pond Bottom Area: 15863. sq. ft ToD Area at 1 ft. FB: 24128. sa. ft 0.554 acres Effecti_ve StoraQe Depth: 6.00 ft Stage 0 Elevation: 456.00 ft Storage Volume: 115567. cu. ft �- VOLUIYIE �Ql�12Ed 2.653 ac-ft Riser Head: 6.00 f� St� p�}G� 3�� f-D/Z Riser Diameter: I-8.00 inches uo��rnF C�iEGK Number of orifices: 3 F�11 Head Pipe Orifice # Heiqht D3ameter Discharqe Diameter (ft) (in) (CFS) (in) 1 0.00 3_31 9A� 3Y�(° 0.730 2 3.65 4.39 g�,y µ��8�0.800 8.0 3 4.81 7.69 1.752 10.0 Top Notch Weir: None Outflow Ratina Curve: None Stage Elevation Storage Discharge Percolation Surf Area (ft) (ft} {cu. ft) fac-ft) (cfs) (cfs) (sq.. ft) 0.04 456.Q0 0. 0.000 0.000 0.00 15863. 0.03 456.03 476. 0.011 O.Q55 0.00 15895. 0.07 456.07 1113. 0,026 0.078 0.00 35938. Q.10 456.10 1592. 0.037 0.096 0.00 15970. 0.14 456.14 2231. 0.051 0_111 0.00 16013. 0.17 456.17 2712. 0.062 0.124 0.00 16f345. 0.21 456.21 3355. 0.077 O.i36 0.00 16088. 0.2�1 456.24 3838. Q.088 0.147 0.00 16220._. 0.28 456.28 4�84. 0.103 0.157 O.OQ 16263. 0.39 456.39 5268. 0.144 U.187 0.00 16282. 0.51 456.51 8230. 4.i89 0.213 0.00 i6412. 0.63 4�6.63 1d207. 0.234 0.236 0.00 16593. 0.75 456.75 I2200. 0.280 0.258 O.QO 16574. 0.86 456.85 14041. 0.322 0_277 0.00 16794. 0.98 456,98 16064. 0.369 0.295 0.00 16926. 1.10 457.10 18103. 0.416 0.313 0.00 17058. 1.22 457.22 20158. 0.463 0.329 0_00 17191. 1.34 457.34 22229. 0.510 0_344 0.00 17324. 1.95 457.45 24141. 0.554 0.359 0.00 1�446. 1.57 457.57 26243. 0_602 0.373 0.00 17580. 1.69 457.69 28360. 0.651 0.387 0.00 17715. 1.81 457.81 30494. 0.700 0.400 0.00 17850. 1.92 457.92 32465. 0.745 0.413 0.00 17979. 2.09 458.04 34630. 0.795 0.426 0.00 18110. 2.16 458.16 36811. 0.845 0.438 0.00 18246. 2.28 458.28 39009. 0.896 0_450 0.00 18383. 2.39 958.39 41038. 0.942 0.461 0.00 18509. �q 2.51 458.51 93267, 0.993 0.472 fl.00 i8646. 2.63 958.63 45513. 1.095 0.48� 0.00 18784. 2.75 958.75 97775. 1.097 0.494 0.00 18923. 2.86 458.86 49864. 1.145 0.504 0.00 19050. 2.98 458.98 52158. 1.197 0.515 0.00 19190. 3.10 459.i0 54469. 1.250 0.525 0.00 19330. 3.22 459.22 56797. 1.304 0.535 0.00 19470. � 3.34 459.34 59t42. 1.358 0.544 0_00 19611. 3.45 459.45 61307. 1.407 0.554 0.00 19740. 3.57 459.57 63684. 1.462 0.563 0.00 19882. 3.65 459.65 65278. 1.499 0.569 0.00 19977. 3.70 459.70 b6279. 1.522 0.579 0.00 20036. 3.74 459.74 670$1. 1.540 0.599 0.00 20084. 3.79 459.79 68087. 1.563 0.631 0.00 20143. 3.83 459.83 68893. i.582 O.b72 0.04 20191. 3.88 459.88 69904. 1.605 0.723 0.00 20250. 3.92 459.92 7�715. I.623 G.783 0.00 20298. 3.97 959.97 71732. 1.647 0.851 0.00 20358. 4.02 960.02 72751. 1.670 0.913 0.00 20418. 4.06 460.06 73569. 1.689 0.935 0.00 20466. 4.18 460.18 76033. 1.745 Q.989 0.00 20610. 4.30 460.30 78515. 1.802 1.Q40 0.00 20754. 4.41 460.91 80805. 1.855 1.080 Q.00 20887. 4.53 460_53 83321. 1.913 1�120 0.00 21033. 4.65 460.65 85853. 1.971 1.160 O.OQ 2i178. 4.77 460.77 88403. 2.029 1_200 0.00 21325. 4.81 46Q.81 89257. 2.099 1.220 0.00 21379. 4.89 460.89 90971. 2.088 1.260 0_00 21472. 4.97 460.97 92693. 2.128 1.340 0.00 21570. 5.05 461.05 94422. 2.168 1.460 0.00 21668. 5.13 46I.13 96160. 2.208 1.610 0.00 Z1767. 5.21 461.21 97905_ 2.248 1.780 0_00 21865. 5.29 461.29 99658. 2.288 2.470 0.00 21964. 5.37 46I.37 10I419. 2.328 2.580 0.00 22063. 5.45 461.45 103188. 2.369 2.680 0.00 22163. 5.53 461.53 104965. 2.410 2.780 0.00 22262. 5.65 461.65 107�46. 2.471 2.920 0.00 22412. 5.7? 46i.77 110344. 2.533 3.050 0.00 22562. 5.88 461.88 112834. 2.590 3.i70 0.00 22700. 6.00 462.00 115567. 2.653 3_280 O.DO 22851. 6.10 462.10 117858. 2,706 3.840 O.OQ 22977. 6.20 462.20 120162. 2.759 4.780 0.00 23104. 6.30 462.30 122479. 2.812 5.960 O.OQ 2323I. 6.40 462.40 124808. 2.865 7.340 0.00 23358. 6.50 462.50 127152. 2.919 8.890 0.00 23486. 6.60 462.60 129506. 2.973 10.400 0.00 23613. 6.70 462.70 131873. 3.027 11.010 0_00 23742. 6.80 462.80 134254. 3.082 11.580 0.00 23870. 6.90 462.90 136647. 3.137 12.120 0.00 23999_ 7.00 463.Q0 139054. 3.192 12.630 O.QO 24128. �.10 463.10 141473. 3.248 13.120 0.00 24257. 7.20 463.20 143905. 3.304 13.590 0.00 24387. 7.3Q 963.30 146350, 3.360 14.040 0.00 24517. 7.40 4�3.40 148809. 3,416 14.470 0.00 24648. 7.50 463.50 151280. 3.473 14.900 O.flO 24778. 7.60 463. 60 153764. 3.530 15.300 0_00 24909_ 7.70 463.70 156262. 3.587 15.700 0.00 25041. � 'r,a:�:��;,� ., . �� .-:::t�1 7.80 463.80 158772. 3.645 16.090 0.00 25172. 7.90 463.90 161296. 3.703 16.470 0.00 25304. 8.00 464.00 163833. 3.761 16.830 0.00 25437. Hyd Inflow Outflow Peak Storage Stage El�v (Cu-�'t) (Ac-Ft) 1 5.35 3.28 6.00 462.00 115572. 2.6�3 2 2.92 1.62 5.13 461.].3 96234. 2.209 3 3.52 1.25 4.88 460.88 90685. 2.082 4 2.73 0.79 3.92 459.92 70772. 1.625 5 2.84 0.76 3.90 459.90 70345. 1.615 6 2_84 0.52 3.01 459.01 52795_ 1.212 7 3.33 0.39 1.76 457.76 2�3604. 0.680 8 1.70 0.34 1.32 457.32 21952. 0.504 H�rd R/D Facility Tributary Reservoir POC Outflow OutfZow Inflow Inf3ow Target Calc 1 3.28 0.49 **�*��'** 3.58 3.57 2 1.62 0_26 ******** ******* 1.74 3 1.25 0.32 ******** ******* 1.38 4 0.79 0.25 ******** ******* 0.84 5 �.76 0.25 �******* ******* 0.81 6 0.52 0.26 *+****** ***��** 0.62 7 0.39 0.30 ******** ***�**� 0.55 8 0.34 0.15 ******** ******* 0.39 ---------------------------------- Route Time Series through Facility Inflow Time Series File:a:dev.tsf Outflow Time Series File:a:rdout POC Time Series File:a:dsou� Inflow/Outflow Analysis Peak Inflow -Discharge: 5.35 CFS at 7:00 on Jan 9 in Year 8 Peak Outflow Discharge: 3.29 CFS at 9:00 on Jan 9 in Year 8 Peak Reservoir Stage: 6.00 Ft Peak Reservoir Elev: 462.00 Ft Peak Reservoir Storage: 115599. Cu-Ft . 2.659 Ac-Ft 1 � Add Time Series:a:bypass.tsf Peak Summed Discharge: 3.58 CFS at 9:00 on Jan 9 in Year 8 Point of Compliance File:a:dsout.tsf F1ow Frequency Analysis Time 5eries File:a:rdout.tsf Project Location:Landsburg ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Pzob (CFS) {CFS) (ft) Periad 1.62 2 2/09/O1 19:00 3.29 6.00 1 100.00 0.990 0.342 8 11/09/O1 8:00 1.62 5.13 2 25.00 0.960 0.756 5 2/28/03 18:00 1.25 4.88 3 10.00 0:900 0.395 7 8/26/04 5:00 0.787 3.92 � 5.00 0.800 0.787 4 1/05/05 15:00 0.7�6 3.90 5 3.00 0.6b7 0.518 6 I/19/06 0:00 0.518 3.01 6 2.00 0.500 1.25 3 11/24/06 7:00 0.395 1.76 7 1.30 0.23I 3.29 1 1/09/08 9:00 0.342 1.32 8 1.10 0.091 Computed Peaks 2.73 5.50 5Q.00 0.980 Flow Frequency Analysis Time Series File:a:dsout.tsf Project Location:Landsburg ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- ' Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob j (CFS) (CFS) Period 1.74 2 2/09/O1 19:00 3.58 =3•S8 .�•A�1 100.0� 0.990 0.389 8 11/03/O1 17:00 1.74 2 25.00 0.960 0.8I3 5 2/28/03 18:00 1.38� /.7Q��o� 10.00 0.900 0.598 7 B/26/04 i:00 0.840 4 S.OQ 0.800 0.8�0 4 1/05/05 15:00 0_813 5 3.00 0.667 0.620 6 1/18/06 21:00 0.620� �.06:. Ok6 2.00 0.500 1.38 3 11/24/06 5:00 0.548 7 I.30 0.231 3.58 1 1/09/08 9:00 0.389 8 1.10 0.091 Computed Peaks 2.97 50.00 0.980 Flow Duration from Time Series File:a:rdout.tsf Cutoff Count Frequency CDF Exceedence Probability CFS $ � $ 0.023 40339 65.784 65.784 34.216 0.342E+40 0.068 5483 8.942 74.726 25.274 0.253E+00 0.114 4680 7.632 82.358 17.642 0.176E+00 0.159 3725 6.075 88.433 11.567 0.116E+00 0.204 2517 9.105 92.538 7.462 0.746E-01 0.250 1664 2.719 95.251 4.749 0.475E-01 0.295 1071 1.747 96.998 3.002 0.300E-01 0.340 652 1.063 98.061 1.939 0.194E-01 0.386 423 0.690 98.751 1.249 0.125E-01 0.431 254 0.414 99.165 0.835 0.835E-02 0.476 173 0.282 99.447 0.553 0.553E-02 0.522 149 0.243 99.690 0.310 0.310E-02 0.567 90 0.147 99.837 0.163 0.163E-02 0.612 26 0.092 99.879 0.121 0.121E-02 0.657 9 0.015 99.899 0.106 0.106E-02 0.703 6 O.OIO 99.904 0.096 0.962E-03 0.798 7 0.011 99.915 0.085 0.848E-03 0.793 4 0.007 99.922 0.078 0.783E-03 � 0.839 3 0.005 99.927 0.073 0.734E-03 0.884 0 0.000 99.927 0.073 0.734E-03 0.929 3 0.005 99.932 0.068 0.685E-03 0.975 3 0.005 99.936 0.064 0.636E-03 1 .02 4 0.007 99.943 0.057 0.571E-03 1.07 � 0.007 99.999 0.051 0.506E-03 1.11 7 0.011 99.96I 0.039 0.391E-03 1 .16 6 O.OIO 99.971 0.029 0.294E-03 1_20 6 0.010 99.980 0.020 0.196E-03 1.25 3 0.005 99.985 O.fl15 0.147E-03 1.29 3 0.005 99.990 0.010 0.978E-04 1.34 0 0.000 99.990 0.010 0.978E-04 1.38 1 0.002 99.992 0.008 0.$15E-04 1.43 0 0.00� 99.992 0.008 0.815E-04 1.47 1 0.002 99.993 0.007 0.652E-04 1.52 1 0.002 99.995 0.005 0.489E-04 i.56 2 O.OQ3 99.998 0.002 0.163E-04 1.61 0 0.000 99.998 0.002 0.163E-04 Flow Duration from Time Series File:a:dsout_tsf Cutoff Count Frequency CD� Exceedence Probability CFS $ $ $ 0.025 40052 65.316 65.316 34.684 0.347E+00 0.073 5728 9.341 74.658 25.342 0.253E+00 0.122 4694 7.655 82.312 17.688 0.177E+00 0.171 3654 5.959 88.271 11.729 O.i17E+00 0.220 2567 9.185 92.458 7.592 0.754E-01 0.268 1623 2.647 95.104 4.896 0.490E-01 0.317 1069 1.743 96.848 3.152 0.315E-01 0.366 698 1.138 97.986 2.014 0.201E-OI 0.415 419 0.683 98.669 1.331 0.133E-01 0.463 264 0.431 99.100 0.900 0.900E-02 0.512 189 0.308 99.408 0.592 0.592E-02 0.561 142 0.232 99.640 0.360 0.360E-OZ 0.610 104 0.170 99.809 0.191 0.191E-02 0.658 26 0.042 99.852 0.148 0.148E-02 0.707 17 0.028 9g.879 0.121 0.121E-02 0.756 9 0.015 99.894 0.106 0.106E-02 Q.805 10 0.016 99.910 0.090 0.897E-03 0.853 8 0.013 99.923 0.077 0.766E-03 0.902 2 0.003 99.927 0.073 0.734E-03 0.951 2 0.003 99.930 0.070 0.701E-03 1.000 Z 0.003 99.933 0.067 0.669E-03 1.Q5 2 0.003 99.936 0.064 0.636E-03 1.10 4 0.007 99_943 0.057 0.571E-03 I.15 3 0.005 99.948 0.052 0.522E-03 1.19 5 0.008 99.956 0.044 0.440E-03 1.24 9 0.015 99.971 0.029 0.294E-03 1.29 4 0.007 99.977 O.Q23 0.228E-03 ' 1.34 3 0.005 99.982 0.016 0.179E-03 1.39 3 0.005 99.987 0.013 0.130E-03 1.44 2 0.003 99.990 0.010 0.978E-04 1.49 0 0.000 99.990 0.010 0.978E-04 � 1.54 1 0.002 99.992 0.008 0.815E-04 1.58 0 0.000 99.992 0.008 0.815E-04 1.63 3 0.005 99.997 0.003 0.326E-04 'i 1.68 0 0.000 99.997 0.003 0.326E-04 ' 23 I -_ . 1.73 1 0.002 99.998 0.002 0.163E-04 Duration Comparison Anaylsis Base Fiie: a:pre.tsf �Tew File: a:dsout.tsf Cutoff Units: Discharge in CFS -----Fraction of Time----- ---------Check of �olerance------- Cutoff Base New $Change Probab3lity Base New $Change 0_529 J O.S1E-02 O.S1E-02 -0.3 � 0.51E-02 �,529 0.529 -fl:l � 0;, 1�� 0.646 � 0_2�E-02 0.15E-02 -46.3 � 0.29E-02 0.646 0.575 -10.9 0.763 t 0.16E-02 O.1QE-02 -34.7 � 0.16E-02 0.763 b.63i -17.2 � 0:879 I 0.11E-02 0.77E-03 -28.8 � O.11E-02 0.879 0.748 -I4.9 0.996 � 0.7-0E-03 0.68E-03 -a.3 � 0.70E-03 0.996 0.985 -l.l 1.11 1 O.S1E-03 0.57E-03 i2.9 � 0.51E-03 1.11 1.17 4.� nOrE 7 �o Y�o 1.23 � 0.26E-03 0.36E-03 37.5 � 0.26E-03 1.23 1.27 3.6 ��, p� 1.35 I 0.18E-03 0.18E-03 4.0 � 0.18E-03 1.35 1.36 l.l 1.46 � 0.15E-03 0.9$E-04 -33.3 I 0.15E-03 1.45 1.38 -6.0 1.58 J fl.65E-04 0.82E-04 25.0 � 0.65E-09 1.58 2.60 1.2 �D�� T�y4N 1.70 � 0.33E-04 a.33E-04 4.D � 0.33E-04 1.70 1.7Q 0.2 1.81 1 0.16E-04 0.00E+00 -100.O � 0.].6E-04 1.81 1.74 -q .� �ALF �O ," .:- 1.93 I 0.16E-04 O.00E+00 -i0Q.0 { 0.16E-04 1 .93 1 .74 -9. 2.05 � 0.16E-04 O.00E+00 -1Ga.t} E a.1r. Maximum positive excursion = 0.077 cfs ( 7.(� occurring at 1.09 cfs on the Base Data:a:pre. �:,: and at 1.16 cfs on the New Data:a:dsout.tsf Ma�cimum negative excursion = 0.141 cfs (-17.3�) occurring at O.S14 cfs or� the Base Uata:a:pre.tsf arrd at 0.673 cfs on the New Data;a:dsout.tsf 2� Return Pe�iod 10� - --- 2 5 i 1 p 2Q _�00 o a:rdout.pks m Landsburg ♦ a:dsout.pks o a:pre.pks � � � R o � 0 o � � 0 .� ♦ ` o00 � o � � o � 10° o ♦ � � � � o � o0 ♦ 0 � , ♦ o I � 10�� , 1 2 5 10 20 3U 40 50 60 70 8U 90 9v 98 99 I � Cumulative Probabitity 2S ' r N a:rdout.dur o � a:dsout.dur ♦ a�.taFget.dur o 00 � r �i 1 ; � � � � � I 1 � � � � � N _ � � I V � � � � {� , v� � i � ' i I i � � � �� C� Q QQ i M O I � oj � � 1��-s ' -a ' � -2 ' -� a � 10 10 '�Q 1Q 1a Probability Exceedence � DATE: 3HSlZt�S JOS NUMBER: 03-470 tt�fi��j�i.�i�ff�►Y DESIGN �� '� i � H= 0.20 ft_ 1 _I , _, L= (Q,ao t�43.21'{H{"'`)3)?-{2.4'H) W�IERE: ' L=i.�NG'�M OF SF'iLLWH'Y I = 18.15ft H= 0.2 ft Q��= 5.35 cfs SAY t9.�fE �--- � �I 27 �-�d<.; rss.e�a: . . � ::�� ` DATE: 3N 6J2005 .:'"'`t�'- �:u�.�s��: £�-,"k7.�'s VER=1'IGA� CRAT� DESt�N � f � , , �Tl , H = 0.50 ft � � i � � � , � j i . � 1 , , � �- � � t `� t ' Qi� = C(L-02#{) H� WHERE: 5.35= 3.3f[L-02(0.5)}0.5^(3/2) Q��= 5.35 cfs F.. = tENGTk OF GRATE �= 4_68 ft H = 0.50 ft L = 3.27+C3.4!-�!�'F SAY 5.Q0 ft f—�-- = 3.30 ZB SECT'ION 53 DETEM70N FACILCT�S Riser Overflow T'he nomograph in Figure 53.4.H can be used to determine the head(in feet)above a riser of given diameter and for a given flow(usually the 100-year peak flow for developed conditions)_ FIGURE 5.3.4.H RISER INFLOW CURVES �� 72 54 48 i 42 t 36 � 33 � 30 27 i - --- 2 4 � � � 21 � � � c � 0 � 18 � � N � € N �� 15 ! :' � s U ' � � � M --- - - -- --- - 1 2 � �i �► ' . � � � _ _ � 10 � � . � E i I S E � ; � i , � ��fta o.i (''), � �o �._ HEAD IN FE T (m easured from crest of riser) �7 `/62, S� Qweir=9.739 DH3Iz � z „z 462,U0-- w ,. Q oririce=3.782 D H 1$ Q in cfs, D and H in feei �1�� Slope change occurs at weir-orifice transition 9/I/98 , 1998 Surface Water Design Manual 5-50 �9 DATE: fl3146/OS JOB: LISERTY GROVEK.IBERTY GROVE CONTtGUOUS WATFR t�UAL� DES1Gt�t -VIIETPOND S�'EP 1: VOLUME FACTflR{f} = 3 STEP 2: RAINFALL FROM MEAN ANNUAL STORIIiI(R) = 0.47 inch STEP 3: VOLUME OR RUNOFF FROM MEAN ANNUAL STORM(V�) Vr=(0.9Ai{0.�5A#g+0_10At#+0.01 Ao)x(Ri12) V1lHERE: Ai=AREA OF IMPERVlOUS SURFACE = 313996 sf Atg=AREA OF TILk.SUIL(GRASS) = 19t228 s# Atf=/4REA OF T1LL SOIL(FORES� = 0 sf Ao=AREA�F OUTWASH SOlL(GRASS OR FOREST) = Q sf Vr= j0.9(313196j+�.25(1�J'1228)+0.10(0}+0.01 (Q)j x(0.47l12) = 12913 cu. �. �TEP 4= WETPflNl�VOLUME Vb= f(Vr) = 38'�39 cu.f�. Voc.UrYIE GHEGK: KEQ�rrZtD vor�cJn�� Fo2 CEu, / = 3$, 739 x o, 3 0 = �/, bzz �f 3 IzEQ�12E0 Ud LU�►'►E FD✓2 GELL2 � 3�, 73�1 X D� 70 = 27i// 7 � 3 s�� P,4G� .3oA- F��Z uvc.u.�E c��ECK � STaGE - ST4RAGE TI�BLE DETEN77UN POND ELEV. STAGE AREA STAGE VOLUME CUMMULATIVE VOLUME (ft.} (ft.} {sq.ft.) (cu.ff.} {cu.#�.) 456 0 f 7,039 0 0 458 2 21,046 38,015 38,015 460 4 24,236 45,303 83,31$ 462 8 27,fi45 51,905 135,223 VOLUME REQUIREU(SEE PAGE 19)= 115,567 cu.ft. < 135,223 cu.ft. .-_ OK WETPQND CELL 1 ELEV. STAGE AREA VOLUME CUMAAULATNE VO�UME (ft-) (ft.) (sQ.R) (cu.ft.) (cu.€t.� 452 0 t,711 0 0 454 2 3,439 5,050 5,050 455 3 4,606 4,008 9,059 455 3 4,796 � 9,059 456 4 5,672 5,22$ 14,z87 VOLUME REQUIRED(SEE PAGE 3E3j= 11,622 cu.ft_ < 14,287 cu.ft. .�. OK WETPOND CELL Z ELEV. STAGE AREA VOLUME CUMMULATII/E VOLUME ift) (ft,} (sq.ft.} («,.�t.) {cu.ft_3 453 Q 8,034 0 0 454 1 9,076 8,550 8,550 455 2 10,161 9,6'13 18,163 455 2 10,356 0 18,163 456 3 11,367 10,858 29,021 VOLUME REQUiRED(SEE PAGE 30}=27,117 cu.ft. <29,021 �.ft. .-. OK 3�� ANALYSIS OF WETI.AND HYDROLOGY The following pages include the analysis of ihe hydralogy to the existing wetIand: The upstream flows will be conveyed to the wetiand by a sepa�rate drainage system,therefore, the pre and post-cievelopme�rt ccmtn`bution fiom the upstream area wili remain �mchanged. In order to mimic existing kydrology, it was neces.sary to allow some on-sit�e area to bypass the detention facility and drain directl}�into#he wet�and The upsfream area time series was added to pre-developed on-site#im�series to generate the historical peak flows to the vvetiand The apstream ar�ea time series was then add�d to tbe on-site post-d�velopmen�t�ne series to genera#e the developed condibon peak flaws to the wetland. A�thovgh it is tmpossibie to match ai! flows,a comparison ofthe pre and post- develflpment peak flow rates(pages 35 and 3�shown that most of the storm ewents are aPProximately equai. As stated in the vvetland evatuation ih Sedion VI of this T.I.R,the wetland is smail and� exhibited very Iimited abiliiy to store stormwater. Punded water is of a very iimiied amourrt in the early growing seaso�. Since most of the nuu�ff entering the wetpc�nd only flows through and discharges�to the downstreatn pipe,we believe only the smalier storm events are cntical to maintain the wetland hydrology. A comparison of the pre and post-deveiopmerrt pealc flow rates show that the 2-yr peak flow rates ar�e almc�st e4uai- Most of the nmoff to the we�tiand cvmes from the upstream areas,which will be ma�ntained. By aliowing some on-site area to also drain into the wetla.nd,�he pealc flow rates are mestly matched We therefore believe that our�gn has suf�tciently provided measures to maintain the we�and � ;�� } , . � Nome News Services Comments Search , � � �■■�s�� ►►�1�� '1�� ►��;��'4wu �� 11 ' � �►r�t � � � ��. � ■ .� � �� ! � � �, �E �►�1�,►�'� , , � . . � . � ��u� � � :� , �� . • � . �,,, � � � � � �� ..�.�►� ti ,� '�"r��1 f ,,.��_ �► �� 5 i. _ . � � �� •. , , �r� � - _,,.�, �� k��i - � � �■ � � ��1;,��..� �--; _ � � �, a ;�'�.��1 �;� —� ° -�. ��f.. � � e _ � '��11i�� -� � I�r��:�� .� � - , , �" . ,�.� —�; � :�l''� � ��''' ,� � � � � �� —�� _ - -- �!� �.__ �.� � ► � � ., ��.�.�.�� - � 1 : � _�� , �•� ,. ;, - ,, - _ �� .�`- � �..""'"��'��- ��I_ _� .�� i�� ►.�.�� ' ,�.. .r}sA,��-J - ��►�� "'�--- ar�:�:� ��,��; .:`��1 �fi.` � �- �� t� � �M�• �►� � � � —� . � _ �� . �. � , � � � �� 1 �� - � , �"--''"� �� 1�� , "��`�' � �� t�� ►��'�.��1�1�� r�"� r.,� �!� �� . 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I � / �� a ' � � .._ �=^ � � � 1 � 1 � � �� i� : �k ' t►� p a� , � / ;�"� 1 I � / � /, ,,� (; / S�� r� , � �I �' � ` 8 � \ � �o�'� , .i�'��.,,i-_ ___ �1 I / j �/ � l % � l �:\,� oo ��I `� �� '' � � � � �, -� / I / I � � ; �,- � ,ti >; � I � I � � ( � �''.� �n' �' �Jm q � „ �' J � �/ — J � J I � � � �_—_ �� - _ �. � � ,�,: �� , � � H /'' ��70100 +T,�_ �' 71+00 �� /" ��_�—/ — ` / ' —�Y— '� � .G � \ �� l—" ..��'��'`�.�.��.�..� ~ � � u , ~ \ � � .� t�Jn.7 �`VL'' cLr_–iroic,�i[ne � i0 •• � '�'--- / \ � UPSr�ar'I a�-s�ni fio k/��kn/D Production of Runoff 7ime Series Project.Location : Landsburg cocaput�ng Seri es : a:aow.tsf Regional Scale Factor : 0.80 Data rype : Historic C reati ng Hou rl y Ti me Se ri es Fi 7 e Loadi ng Ti me se ri es Fl 1 e:C:�K�SWDM\KCRTS\U4TF60H.�'Y1f 54 TZZ1 Forest 1.20 acres Scaling Yr:50 loading Time Series File:C:\KC SwDM\KCRTS\LATG60H. rnf 5U Till �rass 4.32 acres adding trr:50 Loadi ng Ti me 5eri es Fi l e:C:\KC_$4VD1��}\KCRTS\LAE160H.rnf 50 zmpervious 2.08 acres Adding Yr:50 Tota7 Area : 7.60 acres Peak Qischarge: 3.62 CFS at ll:00 on Sep 17 in 1997 Storing Tin+e Series File:a:aow.tsf 50 n�ar�: �� TffF �?�A- Na5 2.Z�I>u/G�t O� 2�.�F% iMF�'2viot�S. 2� G�4ss a Foe�sr .�Q��-s A-ss��v f��s�v a�l �'/�[..o t/�si7S � ,�i,c� coo,u�j �i`9AP. Producti on of Runoff Ti me se ri es ��,�5�//tG CD�t/O,/�/UN Project.Location : Landsburg Comput�ng Se ri es : a:o�we.tsf �{f _ .S iTE ,9,?�EA TD Gv t�TLANL Regional scale Factor : 0.80 Data Type : Historic Creating Hourly Time Series File Loadi ng Ti me Se ri es F71 E:C:\K�SMIDM\KCRTS�LATF60N.rnf 50 Till �arest 2.40 acres Scaling Yr:50 Loadi ng Ti cne Se ri es Fi 1 e:C-\K�SwDM\KCRTS\u�TPfiOH.rnf 50 Till Pasture 2.86 acres Adding Yr:50 Loading Time Series File:C:\K�SWDM\KCRTS\LAE160N. rnf 50 impervious 0.02 acres Adding Yr:50 �ota7 �rea : 5.25 acres Peak ��scharge: 1_09 CFS at 21:00 on Sep 17 ir� 1997 Storing �ime Series Fi�e:a:awe.tsf 50 �V f1t�% J� I NIl'E2��0c�s A�2£A F'Q�Ac.S o. a6 x O• �{ = 0.02 A c 2) f�A57"UQ� al- FD��T A/Z�AS ASSuM�D !ASED QN FiEL� c.�Sirs v� /1/�llG CDU�v7�1 iMAP. ' Production of Runoff Time Series ' Project.�ocati on : �andsburg ��v�� ,UQ�T�� ', Cflmp�ti ng Se r�es : a:1 otsh.tsf I� Regi onal Sca7 e Factor : 0.80 D�tl-S/TE i�2�A TD !,�/�TL{F/VL3 Data Type : Historic ereating Hourly Time Series File Loading Time Series File:C:\KC_SwDM\KCRTS\LATG60H.rnf 50 T�11 Grass 0.25 acres Sca1�s►g Yr:50 Loading Time Series File:C:\K�SwUM\KCRTS\tr4E160H.rnf 50 Impervious 0.55 acres Add-ing Yr:50 -------------- Total Area : 0.80 acres Peak oischarge: 0.493 CF5 at 1Z:00 an sep 17 in 1997 Storing Tirtre Series File:a:lotsh.tsf 50 ND rE : //"1P�R u1oU.S A-2�A 1NCLUn�, : �' Ga TS � �,DoD S.F. E'-,4GH = 0.SS.4c � EX�5r'itiG C'o�vo7/oyI Flow Frequency Analysis LogPearson III Coefficients -------------------------------------------------------- Time se ries File:a:exwet.tsf Mean= 0.066 StdDev= 0_182 Project �ocation-�andsburg skew= 1.040 ---�►nnual Peak Flow Rates--- -----Flow Frequency Analysis------- �iow rtate Rank 7ime of Peak - - Peaks - - Rank Return Prob C1F31 15 2/16/d9 22:00 (4F71 1 89 SOd 0.989 2.78 2 3/03/SO 16:00 2.78 2 32_13 0.969 1.55 13 2/09/S1 2:00 2.55 3 19.58 0.949 0.928 34 1/30/52 8:00 2.09 4 14.08 0.929 0.881 38 3/24/53 15:00 2.06 5 10.99 4.909 1.21 18 12/19/53 19:00 2.01 6 9.01 0.889 0.736 45 2/07/55 22:00 1.97 7 7.64 0.869 0.825 42 12/ll/55 13:00 1.87 8 6.63 0.849 1.02 27 2/24/S7 14:00 1.78 9 5.86 0.829 0.721 46 12/25/57 17:00 1.77 10 5.24 0.8Q9 1.01 29 9/26/59 14:00 1.77 11 4.75 0.789 0.913 35 2/06/60 19:00 1.58 12 4.34 0.769 0.743 44 11/20/60 7:00 1.55 13 3.99 0.749 0.758 43 12/17/61 7:Ua 1.39 14 3.70 0.729 0.991 30 2/28/63 20:00 1.31 15 3.44 0.709 1.77 Z1 b/18/64 17:00 1.28 16 3.22 0.690 1.06 25 11/24/64 4:00 1.24 17 3.03 0.670 0.687 49 12/03/65 17:00 1.21 18 2.85 0.650 0.849 40 11/13/66 20:00 1.19 19 2.70 0.630 0.687 48 2/04/68 0:00 1.17 20 2.56 0.610 2.05 5 6/23/69 21:00 1.13 21 2.44 0.590 0.956 31 11/04/69 13:00 1.32 22 2.32 0.570 1.24 17 9/02/71 4:00 l.11 23 2.22 0.550 1.08 24 9/10/72 15:00 1.08 24 2.13 0.530 0.588 SO 1/13/73 5:00 1.06 2S 2.04 0.510 0.893 37 11/11/73 2:00 1.Q4 26 1.96 0.490 2.01 6 12j27/74 2:00 1.02 27 1.89 0.470 1.04 26 12/02/75 21:00 1.02 28 1.82 0.4�4 1.39 14 8/26/77 1:00 1.01 29 1.75 0.430 1.13 21 12/Ol/77 23:00 0.991 30 1.70 0.410 0.707 47 2/06/79 16:00 0.956 31 1.64 0.390 1.17 20 12/14/79 23:00 0.953 32 1.59 0.370 1.78 9 11/21/80 11:00 0.941 33 1.54 0.350 0.906 36 10/06/81 2:00 0.928 34 2.49 0.330 1.12 22 10/28/82 18:00 0.913 35 1.45 0.310 2.09 4 1/24J84 i�:44 0.945 35 1.41 0.291 1.U2 28 11/O1/84 23:00 0.893 37 1.37 0.271 1_19 19 10/22/85 17:00 0.881 38 1.33 0_251 i.87 8 il/21/86 9:00 0.865 39 1.30 0.231 0.836 41 2/09/88 12:00 0.849 40 1.27 0.211 0.941 33 1/09/89 22:00 0.836 41 1.24 0.191 1.77 10 1/09/90 7:00 0.825 42 1.21 0.171 1.97 7 10/18/90 19:00 0.758 43 1.18 0.151 1.11 23 7/06/92 i5:00 0.743 44 1.15 0.131 0.865 39 3/22/93 19:00 0.736 45 1.12 0.111 1.58 12 9/10/94 24:00 0.721 46 1.10 0.091 1.28 16 11/30/94 5:00 0.707 47 1.08 0_071 2.55 3 2/09/96 0:00 0.687 48 1.05 0.051 4.71 1 9/17/97 11:00 0.687 49 1.03 0.031 0.953 32 10/29/97 6:00 0.588 50 1.01 0.012 Computed Peaks 4.18 100.00 0.990 Computed Peaks 3.40 50.00 0.980 Corap�ted Peaks 2.75 25.00 0.960 corsputed Peaks 2.04 10.00 0.900 conputed Peaks 1.92 8.00 0.875 Computed Peaks 1.50 5.00 0.800 conrputed Peaks 1.08 2.00 0.S00 Z-�f/L Caaputed Peaks . . . � � ��UE�vP�b c�1r�t�1►r�Dnl Flow Frequency Malysis LogPearson III Coefficients -------------------------------------------------------- Time 5eries File:a:comwet.tsf Mean= 0.053 Stdnev= 0.171 Project �ocation:�andsburg sker� 0.826 ---qnnual Peak Flow ttates--- -----Flow Frequency Analysis------- Fiaw Rate Rank Ti�ee of Peak - - Peaks - - Rank Return Prob (CF5) (CFS) Period 1.24 17 2/16/49 19:00 4_1Z 1 89_SO 0_989 2.43 2 3/03/SO 16:00 2.43 2 32.13 0.969 1.37 14 2/09/51 2:00 2.17 3 19.58 0.949 0.879 39 1J30/52 8:00 1.94 4 14.08 0.929 0.899 37 3/24/53 15:00 1.89 5 10.99 0.909 1.18 20 12/19/53 19:00 1.89 6 9.01 0.889 0.517 49 2/07/55 22:00 1_81 7 7.64 0_869 0.774 42 12/11/55 13:00 1.75 8 6.63 0.8�9 , 0.984 29 2/24/57 14:00 1.73 9 5.86 0.829 i 0.750 44 12/25/57 17:00 1.65 10 5.24 0.809 1.05 25 9/26/59 14:00 1.62 11 4.75 0.789 0.899 38 2/06/60 19:00 1.57 12 4.34 0.769 0.666 47 ll/20/60 7:00 1.47 13 3.99 0.749 0.760 43 12/17/61 7:00 1.37 14 3.70 0.729 0.966 30 2/28/63 20:00 1.29 15 3.44 0.709 1.65 10 9/18/64 5:00 1.26 lb 3.22 0.690 1.03 26 11/24/64 4:00 1.24 17 3.03 0.670 0.742 45 12/03165 17:00 1.24 18 2.85 0.650 1.03 27 9/10/67 13:00 1.23 19 2.70 0.630 0.693 46 6/02/68 4:00 1.18 20 2.56 0.610 1.94 4 6/23/69 21:00 1.16 21 2.44 0.590 0.947 32 11/04/69 13:00 1.14 2Z 2.32 0.570 1.29 15 9/02/71 4:00 1.09 23 2.22 0.550 1.23 19 9/10/72 15:00 1.08 24 2.13 0.530 0.572 50 11/25/72 14:00 1.05 25 2.04 0.510 0.916 34 11/11/73 2:00 1.03 26 1.96 0.490 1.81 7 12/27/74 2:00 1.03 27 1.89 0.470 0.931 33 12/02/75 21:00 0.988 28 1.82 0.450 1.47 13 8/26/77 1:00 0.984 29 1.75 0.430 1.09 23 22/O1/77 23:00 0.956 30 1.70 0.410 0.662 48 2/06/79 16:00 0.963 31 1.64 0.390 1.08 24 12/14/79 23:00 0.947 32 1.59 0.370 1.62 11 11/21/80 11:00 0.931 33 1.54 0.350 0.921 35 10/05/81 2:00 0.916 34 1.49 0.330 1.16 21 10/28/82 18:00 0.911 35 1.45 0.310 1.�9 5 ZJ24/84 l�s:� Q.911 36 �.41 �.231 0.963 31 11/O1/84 23:00 0.899 37 1.37 0.271 1.26 16 10/22/85 17:OQ 0_899 38 1.33 0.251 1.75 8 11/21/86 9:00 0.879 39 1.30 0.231 0.817 41 2/09/88 12:00 0.835 40 1.27 0.211 0.91i 36 1/09/89 22:00 0.617 41 1.24 0.191 1.57 12 1/09/90 7:00 0.774 42 1.21 0.171 1.89 6 10/18/90 19:00 0,760 43 1.18 0.151 1.14 22 7/06/92 16:00 0.750 44 1.15 fl.131 0.835 40 3/22/93 19:00 0.742 45 1.12 0.111 1.73 9 9/10/94 14:00 0.693 46 1.10 0.09i 1.24 18 11/30/94 5:00 0.656 47 1.08 0.071 2.17 3 2/09/96 0:00 0.662 48 1.05 0.051 4.12 1 9/17/97 11:00 0.617 49 1.03 0.031 0.988 28 20/29/97 6:00 0.572 50 1.01 0.011 Computed Peaks 3.55 100.00 0.990 canputed Peaks 2.98 50.00 0.980 caaputed Peaks 2.48 25.00 0.9b0 coraputed Peaks 1.91 10.00 0.900 contputed Peaks 1_81 8_00 0.875 computed Qeaks 1.53 5.00 0.800 Computed Peaks 1.07 2.00 0.500 y- y2 co�puted Qeaks . . . 37 � SECTION V _ COI�f VEYANCE S�STEM � ANALYSIS AND DESIGN CONVEYANCE SYSTEM DESIGN The following pages inelude the b�ckwater analysis for the different pipe sections. The 25-yr storm peak flows were used in the design. The peak flows were determined using the KCRTS method with 1 S-min time steps. Portions of the downstream facility along the east side of 160�'Avenue SE were recently upgraded with 30"pi�es,therefore only the undersized pipes will be replaced. As required,the existing conveyance facilities along 160`�Avenue S�up to 50 feet past the house at 14028-160�' Avenue SE v�rere analyzed for the 100-yr storm event 0 �._,.... ! F�,,,�, ._... - ._._ � .�,�.._.•� � � — _1r i ` ,i �.� � (7( •�a,.. y {-'�y�' _� ",,.... / � � V � �� .;,, �f � ;,.r�- � , ,��.:•-�°�,� ��'� � RD��E S'�"~� __..Ix, .......i ��l i �.��-�'�'�.� � � -------' . ; RO:AVE S ;t.`*'��r,,,r.��r�,�--•�`;►..... ,.i •--...�,,•,._ ...�� .._. � OO .. s .�rf��'itfiL..r .�L'�� .. e�i ! 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''= !oo ' 0 L�I��Zty G/ZouE �fb PoN� KCRTS Command CRfATE a new rime series ------------------------ product-ion of Runoff 7ime series Project_�ocation : �andsburg Comp�st-�ng 5e ri es : a:1 gp15.tsf r�eglonal Scai e Factor : 0.80 � Data T�pe : Reduced Creating 15-m-inute Time S�ries Fi1e �oading �ime Se-ries File:C:\K�SWDM\KfJiTS�LATGISR. rnf 8 �ill Grass 1.3� acres scalzng Yr: 8 Loading Ti�re SerieS File:C�\KC_SWDM\KCRTS\LAEZ1�R.rnf 8 zmpervious 3.05 atres �►dding Yr: 8 Tota7 Area : 4.40 acres Peak �ischarge: 4.39 CFS at 7:3U ort 3an 9 in Year 8 Storing Time series file:a:1gp15.tsf 8 Time Series Computed ._... _ .�.) ....�. .J ... . .. Time Series File:a:i gp15.tsf �ruject L.acation:tiandsburg ---nnnual Reak Flow Rate�--- -----F7aw Frequency analysis------- � �iow ttate ttank Time of �eak - - Peaks - - Rank �teturn pro� tc�s) (cFs) Per;od 1.39 7 10/04/04 20:�5 4.39 1 1(30.00 0.994 1.38 8 5/06�aZ 7:15 2.95 2 25.4D 0.9bU 2.88 3 9/10/03 13:45 �.$$ 3 i0.00 0_9Q0 2.75 4 8/25/Q4 23:30 2.75 4 5.00 0_800 1.88 6 9/10/05 16:45 2.00 5 3.00 0.65� 2.93 2 10/22/OS 16:15 1..88 6 �.00 O.SQU 2_00 5 ll�21/06 8:04 i.39 7 1.3(} 0.231 4.39 i 1/Q9l08 7:30 1.38 8 1.10 O.Q91 Computed Peaks 3.91 50.00 O.g80 � Li6�R7Y C�l�D�IE �a�v��uavS 7'0 Pdn/� KCRTS Command CREATE a new Tirne Seraes ------------------------ production of Runoff Time Series Project Location : �andsburg Computing series : a:1�c115.tsf ttegional Scale Factor : 0.80 �a�a rype : REduced Cr�ating 15-minute Time series Fi1e Loadir�g Time Series File:C:\K�.SWDM\KCRTS\LATG1�R.rnf 8 Till Grass 3.04 acres scaling Yr: 8 �oading Time Series Fi1e:t:\KC_SWDM\KCRTS\LAE115R. rnf 8 Impervious 4.14 acres add�ng Yr: 8 -------------- Total Area : 7.18 atres Peak �ischarge: 6.61 Cfs at 7:30 on �an 9 in Year 8 storing Tirne series File:a:lgc115.tsf 8 Time Series Computed Fl ovr Frequency Anal ysi s �ime Series File:a:1gc115.tsf groject Locat�an:tandsburg ---Annual pea�c Flow Rates--- -----�low Frequency �►nalysis------- Flow ttate rtank Time of Peak - - Peaks - - ttank Return Prob ECFS) {CFS) Period 1.95 7 10/04/00 2U:15 6.�1 1 1U0.00 0.990 1.94 $ 5/Ob/02 7:15 4.32 2 25.00 0.9b0 4-II4 � 9�1Q�03-13r4i 4_2� � 1(2��0- a.-�4 4.24 3 8/�S/04 23:30 4.a4 4 S.QU 4}.$OtJ 2.7i 6 9/10/fl5 16:45 2.98 5 3.00 O.b67 4.32 2 10/22/fl5 15:15 2.71 6 2.Q4 0.50U �_� i }.��2�U�r �-�4�- �..45- 7 �.3�} 4.231 6.6� 1 1/4}��8 7:3U 1.44 8 1.10 Q.091 Computed Peaks 5.85 5Q.00 0.980 � UPST2�M 7D U�i2�y GnovE KCRTS Command CREATE a new Time Series ------------------------ Production of rtunoff Time series Projec� Location : Landsburg Comput�ng series : a:ulgl5.tsf Regional Scale Factor : 0.80 �ata Type : Reduced Creating 15-minute Time Series File Loading Time Series File:C:\KC_SWDM\KCRTS\LATFISR. rnf 8 Ti�l �orest 0.23 acres scaling Yr: 8 Loadi�g Time Series File:C:\K�SWDM\KCRTS\LATG15R. rnf 8 Till �rass 1.64 acres ndding Yr: 8 Loading Time Series File:C:\KC_SWDM\KCRTS\LAE115R. rnf 8 Impervious 0.63 acres Adding Yr: 8 -------------- Total Area : 2.50 acres Peak �ischarge: 1.66 CFS at 7:30 on 7an 9 in Year 8 stosing T�rue Series File:a:ulglS.tsf 8 Time Series Computed Flow Frequency Analysis Time 5eries File:a:uigl5.tsf Praject �ocation:�andsburg ---Annual Peak Flow Rates--- -----Flow Freguency Ana7ysis------- Fl ow ttate ttank Ti me of Peak - - Peaks - - ttank Retu rn Prob (CFS) (CFS) Period 0.475 7 2/08/O1 19:00 1.66 1 100.00 0.990 0.361 8 5/06/02 7:15 1.14 2 25.00 0.960 0.827 4 6/25/03 2:15 fl 975 3 10.00 0_900 1.14 2 8/25/04 23:30 0.827 4 5.00 0.800 I 0.559 6 9/10%45 16:45 0.718 S 3.00 0.667 0.975 3 10/22/05 16:15 0.559 6 2.00 0.500 , 0.718 5 11/21/06 8:00 0.475 7 1.30 0.231 ' 1.66 1 1/09/08 7:30 0.361 8 1.10 0.091 Computed Peaks 1.49 50.00 0.980 LJ UPST2E�M TD LBE2`ry G/lovE CvA/n6�oc�S KCRTS Conanand CREATE a new Time Series ------------------------ Production of rtunoff Time Series �roject �ocation : Landsburg Cornputing Series : a:.uplgGlS.tsf ttegional Scale Factor : 0.80 �ata rype : Reduced Crea�iRg 15-mirnrte Time Series File �oading Time Series File:C:\K�SWDM\KCRTS\LATG15R. rnf 8 Ti71 Grass 0.61 acres scaling Yr: 8 � toadi ng Ti me Se ri es Fi 1 e:C:\K�Si�DM\KCRTS\LAEIISR. rnf 8 zrnpervious 0.34 acres Adding Yr: 8 -------------- Total Area : 0.95 acres Peak oischarge: 0.738 c�s at 7:30 on �an 9 in Year 8 Storing Time Series file:a:upigclS.tsf 8 T`ime series computed Fl aer F requency Mal ysi s Time Series Fi3e:a:uplgclS.tsf Project �ocation:Landsburg ---nrinual Peak F7ow Rates--- --=--Flow Frequency Analysis------- � Flow ttate ttank Time of Peak - - Peaks - - ttank Return Prob ' OC209 7 2/08/O1 i9:U� OC738 1 100rQ0 0.990 0.179 8 S/06/02 7:15 0:49 2 25.00 0.960 0.370 4 9/10/03 13:45 452 3 10.00 0.900 0.499 2 8/25/04 23:30 0.370 4 5.00 0.800 0.267 6 9/IO/05 16:45 0.324 5 3.00 0.667 0.452 3 10/22/05 i6:15 0.267 6 2.00 0.500 0.32� S 11/21i�5 8:00 0.209 7 1.30 0.231 0.7�8 1 1/09/08 7:30 0.179 8 1.10 0.091 Computed Peaks 0.658 5Q.00 0.980 � UPsr��lM Q Rs�nl 7D � WETLAn/O � Kc�trs Caarnand CREI►TE a new Ti me se ri e s ------------------------ ProduCtiOn of Runoff Time series Project Location : Landsburg computi ng Se ri es : a_aa►r15.tsf Regional Scale Factor : 0.80 Data rype : Reduced Creating 15-minute Tirne Series File Loading Time Series File:C:\K�SWDM\KCRTS\LATF15R. rnf 8 Till Forest 1.20 acres Scaling Ys-: 8 Loading Time Series File:C�\K�SWDM\KCRTS\LATGZSR. rnf 8 Ti7� Grass 4.32 acres Add-ing Yr: 8 �oadi ng Ti ree se ri es Fi l e:C�\KC_SMfDM\KCRTS\LAE115R.rnf 8 zmpervious 2.08 acres Adding Yr: 8 Total Area : 7.60 acres Peak �ischarge: 4.94 CFS at 7:30 on ]an 9 in Year 8 stas-i�g �'ime series File:a:aowl5.tsf 8 �rime Series Canputed Fl aw F requency Ac�al ysi s Time Series File:a:aowl5.tsf Project �ocation:�andsburg ---Annual Peak Flow Rates--- -----Fiow Frequency Anaiysis------- Flow ttate tt�nk Time of Peak - - Peaks - - rtank Return Prob (CFS) (CFS) Pe ri od 1.41 7 2/08/01 19:00 4.94 1 100.00 0.990 1.13 8 S/06IO2 7:15 3.30 2 25.00 0.96E) 2.46 4 6/25/03 2:15 .92 3 1U.00 0.900 3.30 2 8J25/04 23:30 2.45 4 5.00 U.800 1.71 6 9/1Oj05 is:45 2.15 � 3.fl0 Q.b67 2.92 3 10/22J05 16:15 1.71 6 2.00 O.SQO 2.15 S 11/21/06 8:00 1.41 7 1.30 4.231 4.94 1 1/09/08 7:34 1.13 8 �.10 0.091 Computed Peaks 4.39 50.00 0.980 � 6As��u s KCRTS Corr�nand CREATE a new Time Series ------------------------ Production of Runoff Ti�ne series �roject LacatTon : �andsburg , tamput�ng 5erigs : a:igs.tsf Regional Scalg �actor : fl.80 Data Type : R�dUced creatirry 15-minute Time Series File- �oading Time Se�ieS Fi7e:C:\K�SWDM\KCRTS\LATG25R.rnf $ Tzll �sass 0.41 acres Sca1-"sng Yr: 8 Loading Time Series �i3e:C:\KC_SV�M\K�RTS\LAEi15R.rn� 8 Impe rvi ous 0.31 ac res Addi xrg Yr: 8 Tota7 Area : 0_7� acres peak Discharge: �.594 CFS at 7:30 on 7an 9 in Year S storing T-i�e series �ile:a:lgs.tsf 8 �ime Series �omputed Flaw Frequency Analysis Time series �i1Q:a:i�s.tsf PTo]eCt LOCdt�Ott:tandsbz.srg ---An�ual Peak Flow �tates--- -----Flow �requency analysis------- Fl ow ttate ttank Ti me of Peak - - Peaks - - Rarrk it�tu rn Prob {eFs) E�Fs) Qeriod 0.157 7 2/08/O1 29:00 Q.594 1 100.0U 0.990 0.156 S 5/06J02 ?:i5 0.394 2 2�.40 0.960 Q.322 4 9�14fQ3 13:45 �373— 3 3A.OQ 0.9DQ 0.3�4 Z 8l2�/44 23:36 0.322 4 5.00 �.800 0.226 6 9f10��5 1fi:45 0.263 5 3.00 0.567 0.373 3 1.0/22J{}5 36:�S 0.226 6 2.OQ 0.500 0.263 5 i1f21/Ub 8:40 O.i6� 7 1.3Q 0.231 Q.S94 1 1/09{pg 7:30 0.]55 8 �.10 U.U9Z Computed Peaks U.527 50.00 0.98D �J .aAs��/ w KCRTS Command CREATE a new Time Series Producti on of Runoff Ti me se r-i es Projett �otatinn : �a�dsburg [omput�ng Se ri�s : a:t�.tsf e�gional Scale Factor : 0.8{3 Data Type : Rec#uced Creafing 15-minute Time Series �ile �oading Time Sel'i�5 Fi�e:C-\K�SMtD��1�KCRTSlLATF15R.C71f 8 �il� �orest 0.24 ac�es 5ca13s�g Yr: $ �oadi ng Ti ree se r-i es Fi 1 e:C:\K�SWDM\KCRTS\lATG15R.1'nf $ Till Grass 0.65 acres adding Yr: 8 Loading Time Series F�le:C�\K�53�M\KCRTS�LAE125R,rnf 8 ImperviQus 0.57 acres Add�ng Yr: 8 'rotal area : 1.52 acres �eak oischarge: 1.17 CFS at 7:30 art 3aA 9 in Year 8 sto�is►g Time series �-ils:a:�rr.tsf 8 Time Series [aaputed Flow Frequency Anaiysis Time Series File:a:bw.tsf ProjPct Locatian:�andsburg ---annual Qeat� Flow Ftates--- -----Flow �r-equency Analysis------- �7ow rtate rtank Time of Peak - - Peaks - - ttank Return prob (CFS) (CfS) Pe ri od 0.336 7 2/09�01 3:00 1.1� 1 3.00.00 0.99Q 0.323 8 5/06/02 7:�5 0.753 2 25.00 0.960 0.670 4 �/10/03 13:45 0.743 3 IQ_00 0.990 0.753 2 8/25IQ4 23:30 O.b70 4 S.QQ 0.800 0.458 b 9/IO/(35 16:45 0.523 5 3.00 0.667 0.743 3 10/22/fl5 16:15 0.458 6 2.Q0 O.SOQ Q.523 5 lI/21/06 8:00 0.336 7 1.30 0.23I 1.17 1 1/09/0$ 7:3U 0.323 8 1.10 0.�9I computed Peaks 1.03 50.00 0.98f� /� l��4S�N X K�RTS �onmand CREATE a new Time Series ------------------------ Production of ttunotf Time Series Project �ocation : �andsburg Computing Series : a:bx.tsf Regional scale Factor : 0.80 �ata rype : tteduced creating 15-minute Time Series File Loading Time Series File:C:\K�SWDM\KCRTS\LATF15R.rnf 8 TZ 11 Forest 3.OQ acres Sca�i r►g Yr: 8 Loading Tirne Series File:C:\K�.SWDM\KCRTS\LATP15R.rnf 8 Till Pasture 7.00 acres Adding Yr: 8 �oading Tiroe 5eries File:C:\K�SINDM\KCRTS\LATGISR.rnf 8 Till Grass 7.00 acres Adding Yr• 8 Loading Time Series Fi1e:C_\KC`SY�DM\KCR75\LAEIlSR.rnf 8 zmpervious 4.50 acres Adding Yr: 8 -------------- Total nrea : 21.SQ acres Peak oischarge: 11.38 CFS at 7:30 on �an 9 in Year 8 Storing Time Series Fi�e:a:bx.tsf 8 Time Series Computed ` . I iFlow �requency Analysis ^'`: II Time Se ries �ile:a:bx.tsf ,s P�'oject Location:Landsburg. __ . _-._ . ---�►nnual Peak Flow Rates--- -----Flow Frequency Malysis------- Flow Rate Rank Time of �eak - - Peaks - - rtank rteturn Prob (CFS� (CFS) Period 3.21 7 2/09/O1 3:00 11.39 1 100.00 0.990 2.39 8 5/06/02 7:15 b.55 2 25.00 0.960 5.57 4 6/25/03 2:15 � 3 10.00 0.900 6.55 2 8/25/04 23:30 5.57 4 5.00 0.800 3.64 6 9/10/05 16:45 4.59 5 3.00 0.667 6.36 3 10/22/OS 15:15 3.64 6 2.00 0.500 4.59 5 11/21/06 8:00 3.21 7 1.30 0.231 11.39 1 1/09/08 7:30 2.39 8 1.10 0.091 Computed Peaks 9.78 50.00 0.980 � I��s�nl Y KCRTS Command CREATE a new Time Series ------------------------ Production of ttunoff Time Series Project Location : Landsburg Cornputing Se�ies : a:by.tsf Regional Scale Factor : 0.80 oata Type : Reduced Creating 15-minute Time Series File Loading Time Series File:C:\KC_,SWDM\KCRTS\LATF15R. rnf 8 Ti11 Farest 1.00 acres Scalzng Yr: 8 Loading Time Series File:C:\K�SwDM\KCRTS\LATGISR. rnf 8 Till Grass 4.80 acres adding Yr: 8 Loading Time Series File:C:\K�SWDM\KCRTS\LAEi15R. rnf 8 Impervious 2.00 acres Adding Yr: 8 -------------- Total Area : 7.80 acres Peak vischarge: 5.08 CFS at 7:30 on 7an 9 in Year 8 storing Time ser�es File:a:by.tsf 8 Time Series �omputed Flow Frequency Analysis Time Series File:a:by.tsf Project �ocatios�:tandsburg ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow rtate Rank Time of Peak - - Peaks - - rtank tteturn Prob ' (CFS) (CFS) Period 1.45 7 2/08/O1 19:00 5.08 1 100.00 0.990 1.12 8 5/06/02 7:15 3.44 2 25.00 0.960 2.53 4 6/25/03 2:15 92 8 3 10.00 0.9d0 3.44 2 8/25/04 23:30 2.53 4 5.00 0.800 1.73 6 9/10/OS 16:45 2.20 5 3.00 0.6b7 2.98 3 10/22/05 16:15 1.73 6 2.Q0 0.540 2.20 5 11/21/06 8:00 1.45 7 1.30 0.231 5.08 1 1/09/08 7:30 1.12 8 1.10 0.091 computed Peaks 4.54 50.00 0.980 /a 6A�s�N Z KCRTS Command CREATE a new Time Series i �roducti or► of ttunoff Ti�ne Se ri es ' Project Location : Landsburg ' Comput�ng Series : a:bzl5.tsf Regional Scale Faetor : 0.80 Data Type : Reduced Creati ng 15-m�nt�te Ti rae Se ri es Fi 1 e �oading Time Series File:C:\K�51�t\KCRTS\LATF�SR.rnf 8 �i 1 Z �orest 0.44 ac res Scal�i s�g Yr: 8 �oadi ng Ti me Seri es Fi l e:�:\K�Swoht\KC�tTS\�nTG15 R.rnf 8 Till Grass 5.05 acres Adding Yr: 8 �oada r�g Ti rne Se r�es Fi l e:C:�K�SWDM\KCRTS\LAE115 R.rnf 8 Imp�rvious 2.22 acres �dding Y�: 8 -------------- Total Area : 7.67 acres Peak �ischarge: 5.43 CFS at 7:30 on ]an 9 in Year 8 Storing Time Series �i��:a:bzl5.tsf 8 Time series computed �loy+ Frequency Analysis Time series File:a:bzl5.tsf Project �ocation:Landsburg � ---qnnual Peak F1ow �ates--- -----Flo� Freqaency anaiysis------- ■ Flow Rate ttank Time of Peak - - Qeaks - - [tank Return Prob (CFS) (CFS) Pe ri od 1.54 7 -2J08/O1 I9:U0 5.43 1 I00.00 0.990 1.23 8 5/06/02 7:15 3.71 2 25.00 0.960 2.70 4 6/25/�3 2:15 3.24 3 10.40 0.900 3.71 2 8/25/U4 23:30 2.70 4 5_00 0.800 1.t38 b 9�10�05 16:45 2.3ti 5 3.00 (1.667 3.24 3 10/22/05 16:15 i.88 6 2.00 0.500 2. 36 5 ll/21�Q6 8:00 1.54 7 1.30 U.231 5.43 1 i/09/D8 7:30 1.23 8 2.14 0.093 computed Peaks 4.86 5�.00 0.98� 0 WE 7L A N0 I�A S//1� KCRTS Carertand CRfATE a new Time Series � Producti on af ttunoff Ti� 5eri es � Praject �ocat-ion : �andsbarg ' �omputing Series : A:w€fiu�o.tsf ttegi ona3 Scal e �actor : 0.80 Data lype : Reduced Creating 3.5-minute Time 5er�es File , Loadi ng Ti me Se ri es Fi 7 e:C:\KC_SMlDM�KCRTS\LA'FF15R.rnf 8 fii 1 i �orest 1.04 acres Sca�z ssg �€c: 8 �oadifig �me Series �ile:C:\K�\KCRTS\LATPISR. rnf 8 Ti�l pasture O.SO acres addi�g Yr: 8 Load�ing Tir�e SerTes File:e:�K�SWt)M\KERTS\LAWLISR.rnf 8 wetland 0.40 acres Adding Yr: 8 �o�d�rg Tzme Series -Fi?e:C:\KC`SWU�t\lE��tT'S\LAE115R.�-nf 8 Imperwious O.iO acres adding Yr: 8 -------------- Total Area : 2.00 a�cres Reak �iscfiarge: U.462 CFS at 7:30 Qn �an 9 in Year 8 Storing Tit�de SQries Fi�e:�:wE�t�fl.tsf 8 Time Series Computed Flow Frequency Analysis Time ser�es �ile:a:wetland.tsf Pr�ojeCt tocatian:Landsburg ---�nua1 peak Flow Rates--- -----�low Frequency Arralysis------- F3owr �ate �tank Time of Peak - - peaks - - ttank rteturn �rob �cF53 (cF5) �eriod 0.192 3 2/09/O1 13:30 d.462 � IU0,00 0.990 O.U50 8 i/05/02 15:15 4.2fl2 2 Z�.O� Q.960 v.242 2 6/25jv3 2:15 0.192 3 it3.00 Q.900 0.100 7 8/25/04 23:30 0.1&5 4 5_00 0.800 0.185 4 1/U5�05 9:30 0.174 5 3.00 4.667 (3.134 6 �OJ22/05 16:15 0.1�4 6 2.Q0 0.500 0.174 5 li/23/06 19:45 0.100 7 3..3U 0.231 , U.462 1 i/09/48 7:3Q 0.050 8 1.10 4.491 ' �rx+rputed Peaks 0.375 50.00 0.980 I � f�ASiN �3 KCRTS Cotr�ridrld CREATE a new Time Series Production of �tunoff Tim� Series Project Location : Landsburg I, Comput�ng Se ri es : A:E3.tsf � Regional Scale Factor : 0.80 ', Data Type : Rgdated ' creating �5-mi�ute T7me Series ��le Loading Time SeriQs Fi1e:C:\K�SM�M\KCRTS\LATP�SR.rnf 8 Ti 1� �asture 1.'�U acres Sca1 i s►g Yr: 8 �aading TirtrE Series File:C:\KC_SWDM\K�RTS\L�#TG15R.rrtf 8 T7�1 G�'d55 0.�a acres Addi ng Y�': 8 Loading Time 5eries File.C:\KC_SWDM\KCRTS\LAEi15R_rn� 8 �mpe rvi ous Q.1Q acres adda ng Yr, 8 ', Totai Area : 2.50 acres peak oischarge: �.97fl C�5 a� 7:30 an ]an 9 in Year 8 Storzs�g Tic�e �eries FZZe:A:�3.tsf 8 �ime series Computed lVOI E� DATA� �'l3ftS/N 1��CF/V F�OM �'"!/EN,��LL /�LAT T/,� F�ow �auency�a�t�;Ss E'�lG//1/EF�ivG � D�}TE.t� J u�E/,5� Z�� Tiroe series File:a:e3.tsf � ,S�E ��,�,5 2�q G 2 8' Project �ocation:�andsbc�rg ---Mnual Peak FTow tza�tEs--- -----Flvw Fcequency analysis------- FTow Rate Rank Time of �eak - - €�eaks - - rtank Return Prob (tF5) (CFS) Period 4.252 7 Z/Q�/O1 3:OQ 0.970 1 lOQ.E�O 0.99Q 4_099 8 5/06/D2 7:15 0.461 2 25.00 0.960 0.452 3 5/25/03 2:15 0.452 3 3fl.OD 0.900 0.461 2 8j25ffl4 23:30 0.435 4 5.00 0.8fl0 �.378 5 1/45J05 9:30 0.'s78 5 3.00 0.6fi7 n.435 4 1Q�22/OS 16:i5 0.337 6 2.00 U.500 0_33� b 11/Zr/Ofi 8:15 O.ZS2 7 1.30 U.231 0.970 1 1/Og/08 7:30 Q.099 8 1.10 O.E�91 Cor�rputed Peaks 0.80� 50.00 0.98U /6 �3/+s iN � � KCRTS Command �REATE a new Time Series ------------------------ Production of ttunoff Time series Project_Location : �andsburg Comput�ng Series : A:E4.tsf Regional Scale Factor : 0.80 �ata rype : Reduced Creating 15-minute Time series File Loading Time Series File:C:\KC_SWDM\KCRTS\LATG15R.rnf 8 T311 Grass 0.90 acres sca�is�g Yr: $ Loading Time Series File:C-\KC_SwDM\KCRTS\LAE115R.rnf 8 �mpervious 0.20 acres adding Yr: 8 -------------- Total Area : 1.10 acres Peak oischarge: 0.727 CFS at 7:30 on 7an 9 in Year 8 Storing Time Series File:A:E4.tsf 8 Time Series Computed /UDTF % 1��!TA �' BAaIlU Ti4��AJ �/I1nv� �V ENDELL PcAT T//2 f�y f/A�D �Ot/S �/I��tIEE/�ONG ♦ D�iE1? �l UNE� �S , iov/ Fl ow �requency Anal ysi s ��L� 40/}�;�5 �� - �� Time se ries File:a:e4.tsf ProjeCt LOCation:Landsburg ---nrjnual Peak Flow Rates--- -----Flow Frequenty Analysis------- Flow ttate Rank T�me of peak - - Peaks - - ttank tteturn Preb (CFS) (CFS) Period 0.208 7 2/08/O1 19:00 0.727 1 100.00 0.990 0.136 8 S/06/02 7:15 .��- 2 25.00 0.960 0.360 � 6/25/03 2:15 0.412 3 10.00 4.900 0.520 2 8/25/04 23:30 0.360 4 5.00 0.800 0.224 6 9J10/OS 16:45 0.309 5 3.00 0.667 I Q.412 3 10/22/05 i6:15 0.224 6 2.00 0.50� 0.309 5 13/21/05 8:15 0.20� 7 1.30 0.231 0.727 1 1/09J08 7:3U Q.136 8 1.1U 0.091 computed peaks 0.658 50.00 0.980 � I I � _ I _ i � I I � ' ' ^ �! i � ��' ;; � . . ► � , -�� , , ,, . �_ � � � � , ► �., �; � , �;, - , � , . . , --..,-------- , � . . � � ' CH N L� �'cNCE � 1. .._� •� S CHAIN LINK f ENCE _ ��\ 1.. �.�t , \ / '____–__- i � � I !. .1 1', � ` __ ' _ 1RACT'A' �� -; i � i / 7 +� ;�, � � _� t2 � n i � ,, i accEss l - , & UTIUTIES � � {' 1= ��.s�,� y , , 6 , � , _ � , ' ,. � � �3 0� — — p0 I / � � 1 4r _ �I ! / � � j � �� /�`G�.�'�� - 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BACKWATER CALCULATION SHEET 25-YR DESiGN STORM Pro ject: Libe�ty Grove & Laberty Grove Contiguous Proj No: 01-470 Date: 03/18/05 Pipe Fric- Entr Entr Entr Exit Outle# Inlet Appr Bend Bend Junc Junc Ups Pipe' Pipe Pipe "n" Outlet Intet Pipe Pipe Vet TW tioa HGL Loss Head Head Contr Contr Yel Loss Head Loss Head HW Grafie Chec[c Segment Q Lngth Size Va1ue Elev Efev Area Ve! Head Elev Loss Elev Coeff Loss Loss E1ev Elev Head Coeff Loss Co�ff Loss Elev Eiev HW CB to CB (cfs) t� (�nl ES�I ifP&� (�1 (ft} t� i� (� (� (�1 t�} {ft) {f�� (�3 t�) t�1 P to 4 D.81 1fi9.7 12 0,012 454.00 461.50 OJ9 0.78 Q.01 461.24 0.04 461.28 0.5 0.00 0.01 �61.30 462.00 0.00 0.000 0.000 0.000 0.00 4$2.00 464.60 OK P to 10 7.61 v9.0 15 O.Q12 454.00 459.98 1.23 fi.�0 0.60 461.24 0.69 461.93 0.5 0.30 0,60 462.83 462.17 0.42 0.400 0.239 0.4Q4 0.17 462.82 468.70 OK 10 to 9 6.36 99_3 15 0.012 459.98 46�.Oa 1.23 5.19 U.42 4fi2.82 0.81 463.63 0.5 D.2'! 0.42 464.2G 464.78 Q.4Z 0.320 0.134 0.000 0.00 464.5Q 474.64 OK 9 to 8 6.36 34.3 15 0.012 463.00 463.20 1.23 5.'I9 0.42 464.50 0.28 464.�8 0.5 0.�1 0.42 4G5.40 4fi4.98 0.28 0.280 0.117 D.000 D_00 465.24 474.32 OK 8 6 5.20 1�8.0 15 0.012 463.2Q 467.53 1_23 4.24 Q.28 4652d 0.81 466.05 0.5 0.14 0.28 466.47 4fi�.03 0.28 0.070 0.020 0.000 0.00 �68.77 472.53 OK 6 5 5.20 77.5 15 0.03� 467.53 471.53 1.23 4.24 0.28 468.77 0.42 489.19 0.5 0.14 0.28 469.s1 473.03 0.17 0.700 U.195 O.QQD 0.00 473_05 474.80 OK 5 fo 25 4.03 175.6 15 0.012 471.53 479.45 1.23 3.33 0.17 �73.05 0.53 473.65 0.5 0.09 0.17 A73.91 480.70 �.17 0.1 t0 0.0'19 0.000 O.OU 480.55 482.20 OK � 25 #0 26 4.D9 93.5 15 0.012 479.45 482.08 1.23 3.33 �.17 480.55 4.32 480.86 0.5 0.09 0.17 481.12 483.33 0.17 0.700 0.�17 O.00Q 0.00 483.17 485.29 OK 26 to 27 4.tI9 81.2 15 O.Q'12 482.08 482.62 1.23 3.33 0.17 483.17 Q.28 483.45 0.5 0.09 0.17 483.71 483.87 0.42 1.32Q Q.228 0.000 0.00 483.68 488.08 OK 27 29 4.09 143.3 12 0.012 482.87 483.59 0.79 5.21 D.42 483.68 1.58 485.27 0.5 0.2'1 0.42 485.90 -485.15 0.12 0.000 0.000 O.00U 0.00 485.78 486.38 OK 29 33 �.17 173.3 12 OAZ2 483.59 484.46 0.79 2.76 �.12 d85.78 0.54 486.33 0.5 0.06 0.12 4$6.51 4$5.41 0.12 0.000 O.fl00 0.000 0.00 4$6.39 487.8& OK 33 to 35 2.17 82.8 12 O.Oi2 484.d6 484.87 0.79 2.76 Q.12 486.39 0.26 486.65 0.5 0.06 0.?2 4$5.82 485.82 0.�l2 4.850 Q.�!�J1 Q.00� QAQ 486.8a 488.79 OK 35 #0 36 2.17 112.0 12 O.Q12 484.87 486.59 0.79 2.76 Q.12 486.81 0.35 487.'t6 0.5 0.06 0.12 487.34 �87.54 U.12 0.5flD 0.059 O.fl00 0.00 487.48 490:58 OK 3fi to 37 2.17 14.2 12 0.012 486.5'I 487.48 Q.79 2.76 Q.12 487.48 O.U4 487.53 0.5 O.U6 0.12 487.70 488.43 Q,12 i.330 0.158 0.00t3 Q.00 488.47 �490.69 OK 3�' ta 38 2.17 22.4 42 0.012 487.4$ 487.60 0.78 2.76 D_9 2 488.47 0.47 488.54 0.5 0.06 0.12 488.72 488.55 Q.O� O.OdO 0.000 O.00U 0.00 488.72 499.69 OK 6 to 7 0.6'� 26.4 8 O.Q12 46�.60 469.86 0.35 4.75 0.05 468.77 0.06 468.83 0.5 0.02 0.0� 4fi8.90 470.36 0.00 0.000 0.000 0.000 0.00 �k7Q.36 472.53 OK 29 to 30 'f.41 26.5 12 0.012 483.58 483.65 0.79 1.80 0.05 485.78 0.04 485:82 0.5 O.Q3 U.05 485.89 �84.55 O.Q5 0.490 f3 005 �.000 0.00 485.85 486.38 OK 30 to 31 1.41 13.4 12 U.U12 483.�5 483.92 0.79 1.80 0.05 485.85 0.02 485.87 0.5 0.03 0.05 485.94 484.62 0.0� �.9fl0 0.045 0.000 0.00 48�.94 486.74 OK 3t to 3z 9.41 22.4 12 O.D12 483.92 4$�.94 0.79 1.Sfl Q.05 485.94 0.03 4$5.97 a.5 O.Q3 4.D5 48fi.04 484.84 O.DO O.00U 0.000 0.0�0 0.00 486.04 486.84 �K 33 to 34 2.17 26.5 12 0.092 484.46 484.73 0.79 2.7s 0.12 486.39 0.08 486.47 0.5 0.06 (1.12 486.65 485.67 0.00 0.000 O.Q04 0.�00 0.00 486.65 487.86 �K 27 to 28 1.p7 64.3 12 OAl2 482.87 487.15 0.79 1.36 O.Q3 483.68 0.05 483.73 0.5 0.01 0.03 483.�7 487.77 OAO U.00� Q000 0.0(JO 0.00 487.77 �94.19 OK P: DETENTION POND 2► BACKWATER CALCULATION SHEET 25-YR DESIGN ST�RM Projec� I.i'berty Grove and Liberty Grove Contiguous Proj No: 01-470 Date: 03Jt8/Q5 Pipe Fric- Entr Entr Entr Exit Outlet iniet Appr Bend Bend Ju�c Junc Ups Pipe Ripe Pipe "n" Oat�e# Mlet Pipe Pipe Vel TW tion HGL Loss Head Head Contr Contr Vet Loss Head Loss Head HW Grate Check Segment Q Lngth Size Value Eiev Elev Area Vel Head Efev Loss Elev Coeff Loss Loss Elev Elev Head Goef# Loss Cc�eff Loss Elev Elev HW CB to CB (cfsj (ft) (in) (st� (fps) {ft) (ft) (ft) {ft} (ft) (ft) (ft) (ft) (ft) (#t) (ft) {ft) (ft) i 3 tv 12 t.25 34.5 t2 O.fl9 2 474.46 474.63 0.79 1.59 0.04 475.09 0.04 475.f 3 0.5 0.02 f3.04 475.18 475-30 0.04 t.320 OA52 O.�Q 0.00 475.31 477.91 �K 12 to 11 t.25 26.4 12 0.012 474.63 474.90 U.79 1.59 0.04 4i5.31 U,03 475.34 0.5 0.02 0.04 475.40 475.57 O.t)0 0.000 0.0� 0.�0 0.00 475.37 477.91 OK 14 to 15 1.25 26.4 12 O.Q12 471.54 477.80 0.79 1.55 0.04 478.17 O.t}3 478.20 0.� 0.�2 0.04 478.26 478.47 0.00 0.000 Q.000 O.00p 0.00 478.47 48i.34 OK 22 to 23 1.2� 63.7 92 0.012 48i.86 A�88.00 4.79 �.59 0.04 482.54 0.07 482.61 0.5 0.02 0.04 482.�7 48857 O.DU O.UOQ O.00R 0.000 0.00 488.67 492.29 OK 2 to CM 5.35 31.2 18 0.012 455.5(? 456.00 1.77 3.03 0.14 457.46 0.07 457.53 0.5 fl.07 0.14 457.74 457.30 0.14 t.320 �.f88 D.000 0.00 457.79 464.�0 OK CM to P 5.35 101.0 18 0.012 456.OQ 454.00 1.77 3.03 0.14 457.79 0.22 458.U1 0.5 0.07 0.44 458.22 4�5_30 0.00 O.OQO Q.000 0:000 Q.OQ 458.22 462.00 OK !00 -4� On�D u�2 w Ff h'� � Q� D to 5BP 14.U9 20fi:8 24 0.012 471.� 473.83 3.14 4.49 0.31 472.90 0.68 473.58 4.5 0.16 Q31 47�.05 475.95 0.50 0.210 0.068 0.710 0.3� 475.87 482.40 OK � 58P to 6BP 6.9d 65.5 15 0.012 474.58 478.67 1.23 5.66 0.5t! 475.87 0.64 476.51 0:5 0.25 Q.50 477.26 480.fi� 0.50 Q.300 0.149 0.000 0.00 �8U:27 483.00 OK ' 6BP to �BP 6.94 150.0 15 0_012 478.67 �48t).00 �.23 �.66 0.50 480.27 1.46 481.74 0.5 0.25 0.50 482.48 481.95 0.50 fl.000 O,OOQ 0.000 0.40 481.99 484.24 OK 7BP to 8BP 6.94 '150.0 t5 0.012 480.00 481.65 1.23 5.fi6 0.50 481.99 1.4E 483.45 0.5 U.25 0.�0 484.20 483.60 0.50 �.000 0.000 O.OQD 0.00 483.70 485,40 OK 8BP to 98P 6.94 20UA 'f5 0.012 48{.65 482.94 1.23 5.66 0.50 483.70 1.9� 485.65 0.� 4.25 �.54 48�.4Q 48�.89 0.44 O.00Q 0.000 0.0�.5 O.D2 485.98 4�0.22 OK 9BP to 10BP 6.55 70.8 15 OA92 482.94 �88.90 'l.23 5.34 0.44 485.98 U.62 486.60 0.5 U.22 0.44 487.28 490.75 0.44 1.320 0.585 O.O�ET 0.40 49Q.89 491.70 OK 10B to D 6.55 46.3 15 0.012 488.9Q 489.50 1.23 5.3� 0.44 490.89 0.4Q 4�1.29 Q.5 0.22 0.44 491.� 491.35 0.00 D.OQO 0.000 O.003� 0.00 491.96 492.00 OK 5BP to 4BP 7.15 51.5 15 O.Oi2 474.58 477.28 1.23 5.83 0.53 475.87 0.53 476.40 0.5 0.26 0.53 477.20 479.28 0.53 0.300 0.958 0.3Q9 0.16 479.U7 484,28 QK 4BP #0 38P 7.15 128.5 15 0.09 2 477.28 485.Q0 1.23 5.83 0_53 479.Q7 1.33 480.40 0.5 Q.26 0.53 481.2U 487.� 0.30 1.320 0.6� �.580 0.17 487.57 488.6U OK 3BP to �BP 3.44 2fi.5 12 0.012 485.2� ,485.68 0.78 �.38 0.30 487.57 0.21 487.78 0.5 0.15 0,30 488.23 486.98 0.30 1.320 0.394 O.Q00 0.00 488.32 488.59 OK ZBP fo 1 BP 3.44 205.2 12 0.012 485.68 493.46 0.79 4.38 0.3f1 488.32 1.62 489� 0.5 0.15 0.30 490.39 494.7fi 0.3Q 0.030 0.�309 0.�0 9.00 494.47 49fi.46 OK 1 BP tv D �.4d 36.0 12 0.012 493.46 495.6Q 0.79 4.38 Q.30 494.47 0.28 494:75 U.5 0.15 0.30 495.20 496.� 0.00 O.DOQ 0.000 -0.000 0.00 49fi.9E} 498.00 OK D 1 to 3C 6.52 77.6 t 8 U.012 451.40 �451.95 1.77 3.69 039 452.90 D.25 453.t 5 4.5 0.1 i 0.21 453.47 453.45 0.2 4 0.000 O.aQO 0.000 0.00 453.26 454.70 OK 3C to 3B 6.52 51.8 18 O.Al2 45f.95 �453.05 1.77 3.G9 0.21 453.26 O.t7 453.43 0.5 0.11 0.21 453.74 454.5� 0.21 0.050 0.011 0.000 0.00 454.35 455.81 OK 3B to 3A 6.52 68.9 18 O.Q�2 453.0.5 �454.70 1.77 3.69 0.21 454.35 0.22 454.57 0.5 Q.11 0.21 454.89 45fi.20 0.21 1.320 0.279 O.OiOQ 0.00 456.27 458.80 OK 3A #0 3 6.52 8.5 18 0.012 454.70 454.78 1.77 3.69 0.21 456.27 0.03 456.30 0.5 Q.11 4,21 456.€i1 456.29 0.14 1.320 0.�79 D.000 0.00 456.75 458.24 OK 3 to 2 5.35 142.2 18 O.Ot2 454.79 4.55.50 1.77 3.03 0.14 456.75 0.31 �57.06 0.5 0.07 4.14 457.26 456.80 D.00 1.320 0.188 0.000 0.00 457.46 462.96 OK P: DETENTlON POND D: DITCH CM: COMTROL AAANHOLE Z2 BACKWATER CALCULATION SHEET 25-YR DESIGN STORM Project: Liberty Grove and Liberty Grove Contiguous Proj No: 01-470 Date: Q3/18/05 Pipe Fric- Entr Entr Entr Exit Outtet Inlet Appr Bend Bend Junc Junc Upstrm Pipe Pipe Pipe "n" Outiet inlet Pipe Pipe Vel TW tion HGL Loss Head Head Contr Contr Vel Loss Head Loss Head HW Grate Check Segment Q Lngth Size Value Elev Elev Area Vel Head Elev Loss Elev Coeff Loss Loss Elev Elev Head Coeff Loss Coeff Loss Elev Elev HW CB to CB (cfs) (ft) (in) (sfj (fps) (ft) {ft) (ftj (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) W to 15BP 3.30 186.9 t2 0.012 464.77 470.58 0.79 4.20 0.27 465.77 1.35 467.12 0.5 0.14 0.27 467.54 �471.83 0.27 1.320 0.362 0.000 0.00 471_92 474.87 OK 15B to 14BP 3.30 108.8 12 0.012 470.58 472.19 0.79 4.20 0.27 471.92 0.79 472.71 0.5 0.14 0.27 473.12 473.44 0.27 1.320 0_362 0.000 O.QO 473.53 476.22 OK 14B to 13BP 3.30 116.1 12 0.012 472.19 482.02 0.79 4.20 0.27 473.53 0.84 474.37 0.5 0.14 0.27 474.78 483.27 0.27 0.030 0.008 0.000 0.00 483.00 486.00 OK 13B to 12BP 3.30 127.8 12 0.012 482.02 484.21 0.79 4.20 0.27 483.00 0.93 483.93 0.5 0.14 0.27 484.34 485.46 0.27 0.040 0.011 0.000 0.00 485.20 488.70 OK 12B to 1711 3.30 50.9 12 0.012 484.21 485.64 0.79 4.20 0.27 485.20 0.37 485.57 0.5 0.14 0.27 485.98 486.89 0.00 1_320 0.362 0.000 0.00 487.25 488.04 OK 12B to 116P 3.30 247.3 12 0.012 490.90 491.00 0.79 4.20 0.27 485.20 1.79 486.99 0.5 0.14 0.27 487.40 �92.25 0.00 0.000 0.000 0.000 0.00 492.25 493.00 OK 10 to 16 1.25 239.7 12 0.012 460.23 461.43 0.79 1.59 0.0� 4fi2.82 0.25 463.07 0.5 0.02 0.04 463_13 462.10 0.04 1.320 t�.052 0.000 0.00 463.14 474.12 OK 16 to 13 1.25 100.1 12 0.012 470.74 474.46 0.79 1.59 0.04 463.14 0.10 463.2�4 0.5 0.02 0.04 463.30 475.13 0.04 0.000 0.000 0.000 0.00 475.09 478.18 OK 13 to 14 1.25 57.6 12 0.012 474.46 477.54 0.79 1.59 0.04 475.09 0.06 475.15 0.5 0.02 0.04 475.21 478.21 0.04 0.000 0.000 0.000 0.00 478.17 48'1.34 OK 14 to 22 1.25 218.7 12 0.012 477.54 481.86 0.79 1.59 0.04 478.17 0.23 478.40 0.5 0.02 0.04 478.46 482.53 0.04 1.320 0.052 0.000 0.00 482.54 490.89 OK 22 to 24 1.25 187.9 12 0.012 481.86 482.80 0.79 1.59 0.04 482.54 0.24 482.74 0.5 0.02 0.04 482.8� �83.47 0.00 0.000 0.000 0.000 0.00 483.47 486.38 OK 16 to 18 1.25 124.2 12 0.012 461.43 462_05 0.79 1.59 0.04 463.14 0.13 463.27 0.5 0.02 0.04 463.33 462.72 0.04 0.000 0.000 0.000 0.00 463.29 471.27 OK 18 to 19 1.25 30.4 12 0.012 462.05 466.90 0.79 1.59 0.04 463.29 0.03 463.32 0.5 0.02 0.04 463.38 467.57 0.00 0.000 0.000 0.000 0.00 467.57 469.91 OK 16 to 17 1.25 25.8 12 0.012 470.74 471.00 0.79 1.59 0.04 463.14 0.03 463.17 0.5 0.02 0.04 463.23 471.67 0.00 0.000 0.000 O.Q00 0.00 471.67 473.35 OK 18 to 20 1.25 104.0 12 0.012 462.05 4fi3.'!4 0.79 1.59 0.04 463_29 0.11 463.40 0.5 0.02 0.04 463.46 �463.81 0.00 0.000 p.000 O.Q00 0.00 463_81 46�.89 OK 18 to 21 1.25 102.1 12 0.012 462.05 466.45 0.79 1.59 0.0� 463.29 0.11 463.40 0.5 0.02 0.04 463.45 A67.12 0.00 0.000 0.000 0.000 0.00 467.12 469.46 OK P: DETENTION POND W: WETtAND 1711: EXISTING CB 1711 23. BACKWATER CAI.CUL,A.TION SHEET 1Q0 - YR DESiGN STORM Project: I.i'berty Gro�ve and Liberty Grove Contiguous Proj No: 01-470 Daxe: 03/1�/05 Pipe Fric- Entr Er�tr Entr E�cit Outlet 1n1et Appr Bend Benc# Junc Junc Upstrm Pipe Pipe Pipe "n" Outlet Inlet Pipe Pipe Yet TYV tion HGL Loss Head Head Contr Contr Vel toss Head �oss Head HW Grate Check Segment Q Lngth Size Value Elev EI�v Area Vel Head Efev loss Elev Cceff Loss Loss E[ev Elev Head Coeff Loss Coeff toss Elev Eiev HW CB �o CB (c#s} (f�) (in) Es� (�Psi (ft) (ft) (ft) (ft) (ft� �ft) (ft� {ft) f ft) �ft) (ft) f ft) f ft) D4 to D3 6.52 27.� t8 0.012 441.60 442.10 1.77 3.69 0.21 443.10 0.09 443.19 0.5 0.11 0.21 443.51 443.60 0.00 O.Of}0 4.OQ0 0.000 0.00 443.60 444.85 OK D3 to D2 6.52 46.fi 18 0.012 4h4.00 445.40 1.�7 3.69 0.21 �45.50 0.45 445.65 0.5 0.11 0.21 445.97 4�6.90 0.00 U.000 0.00� O.00Q Q.00 446.90 448.'!5 OK D2 to D1 6.52 52.6 18 0.012 447.50 449.20 1.77 3.69 0.21 449.00 0.17 449.17 0.5 0.11 0.21 449.49 450.70 0.0� 0.000 0.000 0.400 D.00 450.7Q 451.95 OK 05 to D4 26.68 24.1 30 0.0't 2 438.91 439.56 4.91 5.44 0.4fs 44 t.41 0.09 441.50 0.5 0.23 Q.46 442.19 442.4'i 0.QO O.OpO 0.000 0.000 Q.00 442.�1 443.OD OK D6 to D5 26.68 121.7 30 (1.012 4�0.89 -434.43 4.91 5.44 0.46 433.39 0.44 433.83 0.5 0.23 0.46 434.51 437.28 0.00 0.000 0.000 0.Q00 0.00 437.28 438.00 4K D4 to D7 20.16 48.0 24 0.012 439.56 442.69 3.14 6.42 0.64 441.�6 0.32 441.88 U.5 0.32 0.64 442.84 445.49 0.40 0.000 O.ODO 0.000 4.00 445.49 445.50 C3K D7 to CB1B 19.43 59.0 24 0.012 444.86 445.45 3.14 6.49 0.59 446.86 0.37 447.�3 0.5 0.30 U.59 448.12 448.25 0.59 0.03� Q.018 0.000 0.00 447.6� 449.9i OK CB1 to CB1 19.43 239.0 24 �.012 445.45 449.75 3.14 6.19 0.59 447.67 1.49 449.17 0.5 0.30 0.59 450.U6 �452.55 0.54 0.0�0 0.012 0.000 0.00 452.03 454.77 OK CB9 to CB1A 18.46 291.0 24 0.012 449.75 458.00 3.14 5.88 0.54 452.03 1.fi4 453.67 0.5 0.27 0.54 454.47 460.60 O.Oa 0.000 0_000 0.000 0.00 460.60 461.Q0 OK D: DITCH CB: CATCH BASIN � Trapezoidal - LIBERTY GROVE Ct31�tl2�t: DITCH - 50� BEYOf�D tOT 14028 160'i'H AVE. SE Salve For. . . . . .�epth Battom width. . . 3_00 ft veloc�ty. . . . . . . . 5.78 fps �t side s7Qp+e. . 2_QO:i {H:v) �low Area. . . . 4.62 sf Rt Side Slvpe. . Z.40:1 (N:v) �low Top �tidt�+. . 6_78 ft Mannln9`s n. . . . 0.027 Wetted Perimeter 7.22 ft charuiel s2ope. . p.0200 ft[ft cr�ticaT c�epth. . �.06 ft oepth. . ._ . . . . . . d.9� �f Cri��ca7 51ope. . 0.0128 ftJft �ischarge. ._ . .-. 2C_68. cfs Frou�e �uaab�er. . . .�.2� � ,;o�lc �e�iorf� .� �•S �>o•9 y` �?,00 CSE� P�� 20� �' . olC � � i _ �y � ��.�� .,, ��b. � �� r , ��+.�' � . :'�: - Flow Frequency Analysis Time 5eries File:posteast.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Retnrn Prob (CFS) Period 1_94 6 2/09/O1 2:00 3:90 1 100.00 0.990 � 1.59 8 1/05/02 16 :00 52 2 25.00 0.960 2 _32 3 2/27/03 7:00 2_32 3 10_00 0_900 1.73 7 8/26/04 2 :00 2.08 4 5_00 0_800 2 .08 4 IO/28/04 16:00 2.06 5 3_QO 0.667 2 .06 5 1/18/06 16_00 2.94 6 2.00 0.500 2.52 2 10/26/06 0:00 1_73 7 1.30 0_231 3 _90 1 1/09/08 6:00 1.59 8 1.10 0.091 Computed Peaks 3.44 50.00 0_980 lo�o--y/� ovE2Fcv� �orL EI�-SiEi2�l PDND a�' �trE�cl��zl. �,c�T. iA�EN �!�l T!/Z PI?�Ph 2�D B y CD/ZE D�SIGN, INC. � QATED �vL y Zoo�� , -- Table 2. Summary of Existiog Basin Cover Types by Sub6asin Curve Number= 81.0 8�_0 98_0 86.0 98.0 j Cover Type I Subbasin �I!forest Till pasture Wdland Ti1l grass Imperv Tota1 (A� (A� (A� (A� (A� (A�I East Basin el - 5_8 I2_0 I_9 I9.7 e2 6_0: 52 1�.6 7.0 '� e3 - 1_7 0.7 Q_1 2.4 i� e4 - - 0.9 0_2 1_1 � e5 4.0 1_8 I2.3 5.4 23.�. e6 14_9 3.5 9.8 23 30.4 e7 1.8 - - - 1_8 Site- 8.9 22 0_4 - 0_I 11.6 . Subtotal 35.6 202 0.4 51.4 I6.9 124_5 West Basin wl - - 23 0_6 2.9 w2 - 0.7 13.8 1_8 163 w3 - - I_0 02 1_2 w4 - - 2.7 0.� 3_2 w5 - - 1_8 0.4 22 w6 0.8 - 1_8 13 3.8 ��7 l.6 - 3_8 2.4 7.8 w8 3.8 49 0_4 0.0 9.1 Site- Wesi 0.4 1.4 - - 0_1 1 9 Subtotal 6_6 7.0 - 27.6 72 4g_a �i2rJYr! EvEivD�l..c. P�r TIR . Pr2��'r42�D ay h`�At��vs ��, ENGl�V�2iNG � ;d�I�'D � UrtJ�/S � ZGY�/. I 2� . .�.. 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'•,;:}.. ,., TRIBUtARY AREA� •�.:�''z,� � SITE IS 9% ❑F . ,: ', '. � _. v.� TRIBUTARY AREA Cfi;,./'. 'e!�'� � � .,, � '' . ...'.. ,.. r,,, ;..,'f; .,�., '''M^.,•1�,•�;��.. .. ,.. . . . ' �/) � ��I} .17R -1. . " .. ',,' ... . , ...... . , i �,� ' .. ��r . j .,..„.,..,... .. ..�..... ., .. , • V,�.,�V^... .. . . . �.., • . .. . . . . � ' � ..., .. ' ,� . .� ,� •.. � .. �.�. � • ' ' . . . y� " ...� 'f�• � 1 � .. . . .. ,. � . ',� t . PROJECT Haozous Engineering r,o. CIVfL ENOII�EERINQ EVENDELL PLAT . O 14816 SE 136TH ST, RSNTON, VA 980II9 423-233-E707 oaa��n wn, tw e/t2/o2 Drainage Basins 2 ' auw n, wM ��`' e/12/oZ � SECTION VI ' SPECIAL REPORTS & STUDIES � HABITAT TECHNOLOGtES WETLAND EVALUATION AND DELINEATION REPORT AND WILDLtFE HABlTAT EVALUATION LAKERIDGE PROJECT SlTE King County, Washington Part of Section 14, Township 23 North, Range 5 East, W.M. � prepared for l.akeridge Development Inc. P.O. Box 14G Renton, Washington 98057-0146 prepared by HABITAT TECHNOLOGIES P.Q. Box 1088 Puyaffup, Washington 98371-1088 253-84�-5119 November 5, 2002 ��, wetlands, streams,fisheries, wildlife - mitigation and permitting solutions I P.O. Box 7088, Puyallup, Washington 98371 �I voice 253-845-5119 fax 253-841-1942 0 I I EXECUTIVE SUMMARY The Lakeridge Project Site is approximate{y 12_7 acres in total size and located to the east of the City of Renton, ICng County, Washington. The project site is comprised of three parcels; two contiguous parcels (Parce! B # 1457500085 and 'l457500090) of 7.9 acres and an adjacent parcel ( Parcel A# 36G4500149) of 4.8 acxes, kitty-comer to the northwest. The Parcel A portion of the project site is dominated by a well managed and maintained lawn. A single family dwelling with a detached shop is located in the eastem portion of Parcel A. The parcel B portion of the project site is dominated by a livestock pasture in the south with a singie family residence and bam in the west, and a forested area in the north, the westem portion of which has been cleared within the last ten years. Onsite assessment of the proje�t site following the procedu�es outlined in the Washingfon State Wetlands /dentification and Delineation Manual (Vt/ash. Manual� and #he Corps of Engineers Wetlands Delineation Manual (1987 Manual) resulted in the ident�cation of one area that exhibited hydric soils, wetland hydrology, and hydrophytic vegetation consistent with the established critena of both the Wash. and 't 987 Manuals. This area had been impacted by prior grazing and pasture management activities, and active and on-going lawn and pasture management. This assessment, completed in accordance with King County regutations, included an evaluation of the function and value rating for the identified wetfand, a classification of the wetland following the U.S. Fish and Wildlife methods, and an iden�cation of the standard FGng County buffer width required for this wetland_ Onsite assessment also included an evaluation of the wildlife habitat availability and utilization. Species �resenc� and t�abitat utiiization were evaivated �oiiowing the methods identified by Horner and Raedeke (1989) and within U.S. Fish and Wildlife Service Pubiication 80/58 (Mikol, 1980}. In addition, the King County Wiidlife Study Guidelines (Draf� Wiidlife Management in King County, fssue Paper, 1993) were fol(owed to assure consistency with the King County permit process and documentation of habitat types. WETI�IND StZE ONSITE CtASSIFICAT�N KtNG COUNTY �UNCTION STANDARD (square feet) (USFWS) RATING AND VALUE BUFFER RATiNG WIDTH C 9,967 PEME 3 tow 25 feet PEME palustrine, emer�gent, seasonally flooded The �habitat type" best represented within the site wou(d be that of "Agricultural Lands." This habitat type included two freshwater wetlands. PRlMARY HABITAT TYPES INCLUDED MINOR HABITAT TYPES - Agricultural Lands Wet meadow - Residential Mixed U land Forest-low understo 0 i The U.S. Army Corps of Engi�eers and fGng County, as well as a number of other tocal, state, and federai agencies, regulate activities in and around identified wetiand and � drainage corridor areas. Such regulations focus on the avoidance of adverse impacts to wetlands, streams, associated buffers and the mitigation of such impacts that cannot be avoided. King County has established criteria to categorize wetla�ds for purposes of regulation and the establishment of buffers. !n addition, Kmg County allows a limited amount of alterations to wetlands (i.e. isolated wetlands, roadway crossingsj provided such impacts are mitigated pursuant to an approved mitigation plan_ The Se/ected Action P/an of the Lakeridge project site focuses on the cxeation of independent lots suitabte for the development of single-family homesites consistent with the King County Comprehensive Plan. a.#'- . • � _ ,r,*;. . . .. . . . . - � . - . ' t�'` . � � ' . � . . . . . �" . .. � . � .� - � . . �. . � . ' . . . . .. . � . �;;� .s;,:- - � . . . . . . . . _. ' '� �. . . - � � . . . . . { ... � . . . . . . , • � � . . _ . - x • . O TABLE OF CONTENTS � INTRODUC'I'ION.................................................................................••---.............................. 1 STUDYPURPOSE•-•-••...................•--•--•--.........._..__..........................-•----..................-•-•----..... 1 SI'I'E DESCRIP"TION..--�.............•-�•---.......-•--••--••---••---•--............._...._......._................_............ 1 BACKGROUND iNFORMATION.........................................................................................Z NATIONAL WETLAND INVENTORY MAPPING.............•---••-----...---......_...---..................2 STATE OF WASI-IlNGTON PRIORTI'Y HABITATS AND SPECIES.................................. 2 STATE OF WASHINGTON STREAM CATALOG....................................................•---...._.2 KING COUN'I'Y SENSI'I'IVE AREAS MAPPING...............................................•-----•--........2 SOILSMAPPING.................................................................................................................. 2 AERIAL PHOTO ANALYSIS............................................................................................... 3 ONSITE EVALUA'I'ION-WETLANDS................................................................................3 WETLAND S'I'iJDY ME'I�iODS.......................................................................................... 3 FIELDOBSERVATION................................................................................................•--•--..4 • Yegetation......................................•--............................._....._.....---...__......__............... 4 • Soils.....................................••------•---.............._.................................._........_.............. S • Hydrology..........................•-•--.........................._....._......._..........................._..........._.. S WETLAND AND STREAM DE'I'ERMINATION.............................................. ...............6 � WETLAND F[JNC'I'ION AND VALUE ASSESSMENT........................................................7 ONSI'I'E WETLAND VALUATION...................................................................................... 9 ONSITE EVALUATION-WILDLIFE..................................................................................10 WIi..DLIFE S'I'tJDY ME'I'HODS.--.••.............................................••-----•--................_...-•---....10 ONSI'I'E HABI'I'AT TYPES --•--••---•--•-�-�---•-•--...-•-�-•-•.................................•---�-•-•---..._......-----10 PLANT AND ANIMAL SPECIES OBSERVA'1'IONS--------------•--..........._.............._....._..._....11 MOVEMENT CORRIDORS ............................................... ........12 ......................................... PRIOR.i'I'Y SPECIES............................................................................................................13 S'I'A'TE CANDIDA'1'E SPECIES .............................•-•-------•--.....__....................._.....--•-••--•--...13 REGULATORY CONSIDERATION.....................................................................................13 U.S_ ARMY C4RPS OF ENGINEERS -SEc�rtoN404..........................................................13 STA'TE OF WASHINGTON DEPARTMENT OF ECOLOGY.............................................14 KING COIJNTY-"�rvutOrnv�ivl',v,LY S�xSrrtv�AxE�s"ORnII1ANCE 2 tA24................14 . Wetland and Stream Classes...............................•••--.........._..................._....._............14 • Reyuired Bufj'ers..................................... ......................15 ............................................ SELECTEDACTION PLAN..................................................................................................16 FIGURES.................................................................................................................................17 REFERENCELIST................................................................................................................18 APPENDIXA..........................................................................................................................19 O STANDARD OF CARE Prior to extensive site pianning, this document should be reviewed and the wet[and boundaries verified by the appropriate resource and permitting agencies. Wetland boundaries, wetland classifications, wetland ratings, and afl proposed wetland restorafion and enhancement activities should be reviewed and approved by FGng County and potentialty other regulatory staff. The above consultants have provided professional services fhat are in accordance with the degree of care and skitl generally accepted in the nature of the work accomplished. No other warranties are expressed or implied. The consulta�t is not responsible for design costs incurred before this document is approved by the appropriate resource and permitting agencies. Mark Heckert Wetland Ecologist M - � � INTRODUCTION This repo�t details the culmination of activities and onsite evaivations undertaken to complete both a wetlands evaluation and a wildlife habitats assessment as an element of the planning and site development of the Lakeridge Project Site. The project area is approximatety 12.7 acres in totai size and generally located within a quickly urbanizing area east of the City of Renton, King County, Washington (Figure 1). The evaluation and delineation of onsite and adjacent wetlands, drainage corridors, and wildlife habitats is a vita! element in the planning and sefection of a site development action. The goal of this approach is to assure that planned site platting does not result in adverse environmental impacts to such areas. Wettands are generally de#ined as "those ar+eas of King County that are inundated or saturated by ground or surface water at a frequency and duration sufficient to support, and that under normat circumstances do support, a prevalence of vegetation typicaily adapted for life in saturated soit conditions." (Ki�g County Environmentally Sensitive Areas). STUDY PURPOSE This purpose of this document is to present the results of the onsite assessment and '�, M evaivation of the wetland/drainage corridor areas and the wildlife habitats within the ' project area. lnduded within this report is an assessment of the proposed impacts and compensatory actions to be taken to ensure that proposed onsite actions do not ' adversely impact environmentally sensitive areas. This study was designed to accommodate site planning and potential regu{atory actions. This report is suitable for submitta! to federal, state, and local authorities for wetfand boundary verification and ' permitting actions. SITE DESCRIPTtON The project site is comprised of three parcels; finro contiguous parcels ( Parcel B # 1457500085 and 1457500090} of 7.9 acxes and an adjacent parcel ( Parcel A # 366450Q141) of 4.8 acxes kitty-comer to the northwest. The Parcel A portion of the pro}eck site is dominated by a weit managed and maintained lawm. A single-family � dwelling with a detached shop is {ocated in the eastem portion �f Parce! A. The parcet B portion of the project site is dominated by a livestock pasture in the south with a singie-family residence and bam in the west, and a foresfied area in the north, the westem portion of which has been cleared within the last ten years. The forested � portion of parcet B is dominated by a mixed forested plant community of mature Douglas fir(Pseudotsuga menziesi�) and mature big leaf maple (Acer macrophy/lum). The project si#e is generally flat and rolling and two narrow drainage corridor areas are I present generally through the center of the Parcel B portion of the site. The eastem narrow drainage corridor is a ditch, created in upland, to convey surface water from the 02154 Lakeridge-'1 WetlandNVildlife Report � residential developments to the north. This ditch conveys surface water through the site north-#o-south, into the common ditch in the south, then offsite into a cuivert at the property boundary. The westem narrow drainage comdor is a ditch which was apparentty created, within an upland area, in the c�urse of developing the residential sites to the north, and flows south through the center of the B parcel, joining with the eastem ditch, #hen flowing offsite to the south into a culvert. There is no evidence onsite o#a continuous stream channel other than the ditches. BACKGROUND INFORMATION NATt�NAL WETLAND INVENTORY MAPPING The Nationai Wetland Inventory (NWI} mapping comp{eted by the U.S. Fish and Wildlife Service was reviewed as a part of this assessment. This mapping resource did not identify any wetlands or drainage corridors on the project site. (Figure 2). STATE 4F WASHiNGTON PRI4RlTY HABITATS AND SPECIES The State of Washington Priority Habitats and Species (PHS) Mapping was reviewed as I a part ofi this assessment. This mapping resource did not identify any Priority Habitats �� or Species onsite or within the immediate vicinity(Figure 3)._ i STATE OF WASHINGTON STREAM CATALOG ' The State of Washington Stream Catalog for Puget Sound was reviewed as a part of this assessment. This mapping resource did not identify any streams within the project site. This mapping did identify the Cedar River to the south of the project site. The Cedar River was identified to provide habitat for a number of anadromous and resident salmonid fish specc:ies. KfNG COUNTY SENSITNE AREAS MAPPING The King County Sensitive Areas Mapping was reviewed as a part of this assessment. This mapping resource did not identify any wetland areas or streams within or adjacent to the prvject site. (Figure 4). SOILS MAPPiNG A review of the mapping of soit types within the prvjed area completed by the U.S. Soils Conservation Service (SCS) identified that the onsite soils consist primarily of Alderwood gravelly sandy loam (Soi/s Survey of King County Area Washington, Nov. 1973) (Figure 5). This soil is described as: 02154 Lakeridge-2 WetlarsdhN'adlife Repart � i ; , AqC - Alderwood q�aveliv sandy loam: This series consists of moderately weil drained soiis that have a weakly conso{idated to strongly consolidated substratum at a depth of 24 to 40 inches. This soil is on uplands and formed in giacial deposits. A typical pedon of Aldecwood soiis from 0 -12 inches is dark brown (10YR 4/3) gravelly sandy {oam. From 12 to 27 inches the soi! is grayish-brown (2.5YR 5/2) grave!!y sandy loam with many medium, distinct mottles. This soil series is not listed as a hydric svil. AERlAL PHOTO ANALYSIS Recent aerial photos of the project site were used within the background data collection process. These aeria{ photos identified that a livestock pasture community and single- family houses dominated the majority of the projec� site. A mixed forest community was identified to pass generally within a narrow corridor through the eastem portion of the parcet B site. The project site was within an area of large-lot single family homesites and a number of intemal roadways were present through the site. - ONSITE EVALUATION - WETLANDS ' WETLAND STUDY METHODS Presently accepted wetland identification is based on a three parameter cxiteria test as established within both the Corps of Engineers Wet/ands DeJineation Manua! (1987 Manual) and the Washington Stat� Wetfands ldentificafion and Delrrreation Manual (Wash. Manual). These criteria are: 1. A predomi�ance of hydrophytic vegetation. 2. The presence of hydric soits, and 3. The presence of wetiand hydrotogy. Initial onsite assessment and evaluation was completed during several site visits in September 2002. Specific identification of wetland boundaries was completed on September 10, 2002. Assessment transects were estab{ished on a northlsouth pattem through the project area. Wetfand assessment within the project site followed the methods and procedures outlined in both the Wash. Manuaf and the 1987 Manual. Onsite assessment noted that there were no differences in the identified wetland boundaries as a result to using either the Wash_ Manual or the 1987 Manuai. Drainage corridors were assessed and identified in aocordance with the criteria established by FGng County and the State of Washington Departrnent of Natural Resources {WDNR) Forest Practice Rules (WAC 222-16-030). The boundary between wetland and non-wettand areas was established by examining the transitional gradient between wettand criteria along transects through the site. 02154 takeridge-3 Wetland/Wildlife Report O Delineation was performed using the r�utine methodology for areas greater than five acres as detailed in the 1987 Manual. Fie(d data sheets are provided in Appendix A. Identified boundaries were marked in the field with number flagging. These baundaries were then surveyed and made a pa�t of the site plan mapping. FiELD OBSERVATION • Vegetatio� A mature managed pasture/lawn plant community dominated approximately two-thirds of the project site. This plant community was composed of a wide varie#y of invasive and seeded grasses. This plant community included colonial bentgrass (Agrostis tenuis}, meadow foxtail (Alopecurus pratensis), velvet grass (Holcus lanatus), reed canarygrass (Phalaris arundinacaea), bluegrass (Poa spp.), fescue (Festuca spp.}, orchardgrass (Dactylis glomerafa), quadcgrass (Agropyron repens), txacken fem (Pteridium aquilium), westem yarrow (AchiUea lanulosa), thistle, cats-ear (Hypochaeris spp), softrush (Juncus effusus), tansy (Tanacefum vulgar+e), dandelion (Taraxacum offcina/e), buttercup (Ranunculus repens), curted dock (Rumex crispus) and dover (Trifolium spp.). This plant community was identified as non-hydric {i.e. typicat of uplands) in charader. � In the northeastem portion of parcel 6, the dominant onsite species was Douglas fir and big leaf maple. These mature trees formed open stands across the treed portion of the site. Additional tree species ocx;urring onsite induded Westem red cedar (Thu/a plicata), Western hemlock (Tsuga heterophy/la), red alder (A/nus rubra), black cottonwood (Populus trichocarpa), cherry {Prunus spp), and cascara (Rhamnus purshiana). The understory included a wide variety of shrubs and herb species including vine maple (Acer circinatum), salal (Gaulfheria shallon}, Oregon grape (Berberis spp.), hazefnut (Corylus cornuta), salmonberry (Rubus spectabilis), Scot's broom (Cytisus scoparius), '�, Himalayan blackberry (Rubus p►�c,era), evergreen blackberry (Rubus /aciniatus), Pacfic red elderberry (Sambusus racemosa), snowberry (Symphoricarpus albus), bracken fem ' (Pteridium aquilium}, and sword fern (P�/ystichum munifum). Throughout the project site this plarrt community had been altered by prior forest harvest actions. This plant community was identfied as non-hydrophytic(i.e, typical of�on-wetlands). Parcel A was comprised of a single family house with a shop with the remainder of the prope�ty well maintained and intensively managed as a lav►m. The plant community within the central drainage cvrridor of parcel B that was ident�ed to generally pass from north to south through the site was dominated by a young, mixed deciduous forest and emergent piant community. This plant community had also been altered by prior forest harvest and grading actions which had removed the mature trees, created slash pites, and created an intemal ditch across this drainage. Observed iree species inGuded sapling red alder, black cottonwood, and Pac�c willow (Salix 02154 Lakeridge-4 WetlandMl'�Idlife Report � lasiandra). The understory was dense and included salmonberry, Douglas spiraea (Spiraea doug/asi�), Westem crabapple (Pyrus fusca), Sitka willow (Salix sitchensis), slough sedge (Carex obnupta),horsetail (eqruisetum arvensis), buttercup (Ranunculus repens}, reed canarygrass (Phalaris arundinacea), soffrush (Juncus eflusus), and {ady fem (Athyrium filix-femina). This plant association was iden#ified as hydrophytic in character (i:e. typical of wetlands). The plant community within the south-centrai portion of parcel B (Wetland C) was dominated by an emergent plant community comprised of reed canatygrass. This plant community had been altered by on-going grazing and pasture managemen# activities. This p4ant associatson was identified as hydrophytic in character {i.e, typical of wetlands). • Soits As identified by numerous sample plots throughout the project site, the majority of the site exhibited a soil profile typica! of the Alderwood soil series. The soil was defined as gravelly sandy loam with a soil matrix color of dark brown �10YR 3/3) to brown (10YR 414). These soils did not exhibit redoximorphic features such as prominent soi! motties, oxidized rooi channels, or glayed soil layers within the first 20 inches of soil depth. The majority of the project site exhibited soil which would not be considered °hydric.' Representative sample plots are iderrt�ed on Figure 4. (S,pecial note - many more sample ptots were completed during the fietd assessment than are shown within Figure � 4 or reported within Appendix A). Sample plots within the defined drainage corridor that was identified to generally pass from north to south through the central portion of parcel B exhibited a mixed gravelly ioain sail �exture. These sais appeared to be minerat in character. Soils ranged in color from very dark brown ('{OYR 3/1) to dark grayish brown (10YR 4/2). �, Redoximorphic features were present and often very prominent. Soils within these areas exhibited "hydricA characteristics. Sample plots within the depression at the soufhem portion of parcei B exhibited a mixed graveily loam soil texture. These soils appeared fo be mineral in character. Soils ranged in color from very dark brovm (10YR 3/1) to dark grayish brown (10YR 4/2). Redoximorphic features were present and often very prominent. Soils within #hese areas exhibited �hydric" characteristics. • Hydrology Onsite hydrotogy appeared to be the result of seasonal stormwater runoff from onsite and adjacent properties. In addition, the pattem of surface water movement appeared to have been modified by prior land use activities. These activi6es have included the devefopment of offsite homesites, the development of roadways and utilities, and the placement of culverts. 02154 Lakeridge-5 WetlandlWildlife Repo�t �p The genera! movement of surface water runoif across parcel A of the site was generally to the south. Surface water through parcel A was captured in boundary and roadside ditches which occurred at the west, south, and east boundaries of the site. 6ased on fiefd indicafors (i.e. water stained leaves, drift lines, surface water, soil saturation, oxidized root channets, wetland drainage pattem) no poction of parcel A met the wetland hydrology cxiteria of the 1967 Manual and the Wash. Manual. Within an area located in the north-central portion of parcel B, directly south of the new development to the north, evidence of the passage of water was documented. This area was in a small, linear depression, and had been created and impacted by prior land use aetions (i.e. compaction, creation of drainage corrido�). This cocridor was apparently created, through upland soils, during the development arf the houses to the north to facilitate the drainage of water collected by the homesites. Based on field indicators {i.e. water stained leaves, drift lines, soil saturation, oxidized root chara�e{s, wetland drainage pattem) this iinear feature met the wetland hydrology cxiteria of the 1987 Manual and the Wash. Manual. However, this drainage appeared to be cxeated within an upland area, as evidenced by the soils, and was assuming hydric characteristics as a result of the direction of roof and street runoff through the site. In the northeast portion of parcel B, a storm drain culvert outletted on to the site_ This stoRn drain apparentiy collected stormwater runoff from the development to the north as well as street runoff. This runoff was directed through a ditch, created in upland, south through the site, joining with #he centraf ditch in the southem portion of the site. Based on field indicators (i.e. water stained leaves, drift lines, surface water, soil saturation, oxidized root channeis, wetland drainage pattem) this drainage oorridor did not meet the wettand hydrofogy criteria of the 1987 Manual and the Wash. Manual. Within an area tocated in the south-centra! portion of parcel B, evidence of seasonat soil saturation was also documented. This area was in a smail depression, and had been impacted by prior land use actions (i.e. grazing, oompaction, pasture management). This area received the combined nnoff from the two ditches to the north. Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxidized root channels, wet{and drainage pattem) #his depression met the wettand hydrology criteria of the 198?' Manua{ and the Wash. Manual. 1NETLAND AND STREAM DETERMINATION Wetland determination was based on sample plots which confained hydrophytic vegetation, hydric soils, and wetland hydrology in accordance with the 1987 Manua! and the Wash. Manual. Based on these methods one wetland area was identified onsite (Figure 4). No area was identified onsite to exhibit characters typical of a "streamA (i.e. a continuous pattem of surface water movement, either permanent or intermittent). 02154 Lakeridge-6 Wetia��tdlrfe Report // However, two areas, noted to have been intentionaify created in upland areas, directed runoff through the site in parcel 6. � WETLAND SIZE ONStTE CLASSIF{CATION KING COUNTY FUNCTION STANDARD i (square feet) (USFWS) RATING AND VALUE BUFFER RATING WIDTH C 9,167 PEME 3 low 25 feet I PEME palustrine,emergent, seasonally flooded Wetland C: This wetland was identified within the lower portions of a topographic drainage that passed generally from the central northem boundary to the south boundary of the project site. This wetland was dominated by an emergent plant community comprised entirely of reed canarygrass. This plant community was very dense. This wettand exhibited shallow ponded surface water during the winter and early growing season as a resuft of topography and the direction of the surface water by the ditches irrto the area. Soil saturation to the surface was noted to occur within a majority of this wetland oomp{ex into the early pa�t of the growing season. This wetland plant community ended adjacent to a culvert inlet at the southem boundary of parcel B. Wetland C was identified to meet the U.S. Fish and Wildiife Service (USFWS) criteria for class�cation as palustrine, emergent, seasonally flooded/saturated (PEME)_ Based � on the size of the wet{and and the emergent plant community this wetland complex was ident�ed to mee# the criteria for designation a King County Class 3 Wetland. As such, King county mandated the protection of this wetland with a 25 foot buffer as measured perpendicutar to the wetland edge. Ditches: T�nre ditches tran�eet parcel � vf the project sit�, nort�h to south, approximateiy through the site, originating at SE 136�' Street, proceeding south to the southem boundary of the site, then exiting via a culvert under the property adjacent to the south at the southem site boundary. These di#ches apparently convey swface water from offsite through the site. Because these features are entirely artificial watercourses, intentionally created in upland, these ditches apparently do not meet the regutatory criteria for designation as a King County "stream". . WETLAND FUNCTiON AND VALUE ASSESSMENT Wetlands are known to perForm significant roles in the ecosystem, some of which are of immediate vatue to society. These roles vary greatly with the size, type, hydrqtogy, vegetation, and location of wetland areas. Although ihe ecological functions per€ormed by this wetland are complex, interrelated, and diificuit to assess and quantify, methods have been deveioped for the U.S. Army Corps of Engineers (Adamus et al_ 1987: Reppert e# at. 1979). The functions provided by wetlands indude hydrologic suppor#, shoreline protection, stormwater and floodwater storage, water quality, groundwater recharge, and provision of wildlife habitat. 02154 Lakeridge-7 Wetlan�ldlife RepoR O Q The HYDROLOGIC SUPPORT FUNCTION is d�ned by the measure of hydrologic stability and environmentai integrity which the wetland provides. This function is measured by the frequency of inundatian and saturation by tidal actions, stream flow, runoff, and precipitation. Wetlands permanentiy inundated or saturated, or intertidal wettands are valued as high. Medium valued wettands are seasonally fiooded or are open water systems that remain saturated during most of the growing season. Wetlands that are intermittently flooded or hydrologically isolated are considered of low value. The SHORELINE PROTECTiON FUNCTION is defined by the measure of shielding from wave action, erosion, or storm damage which a wetland provides. This function is measured by the focation and width of the wetland along shoreline areas, types of vegetation present, and the extent of development along the shoreline. A high value is given to wetlands along a shoretine that have a width greater than 200 yards and dense woody vegetation. A medium value is given to a wetland with a width of 100 to 200 yards, sparse woody vege#ation, and dense emergent vegetation. Wetiands tess than 100 yards in width and emergent or lacking vegetation are considered of low value. The STORMWATER AND FLOODWATER STORAGE FUNCTtON is defined by the abitity of a wetland to store water and retard flow during periods of flood or stoRn discharge. Wetlands of larger size are generally considered to have greater ability to provide this funetion. In addition, wetlands nearer to urban or potentially develop-able areas are also considered to provide greater �lood protections than wet(ands which are in undeveloped areas. The WATER QUALITY FUNCT'ION is defined by the physical, biological, and :hemical �rocesses which wetlands provide to naturatty purify water. This function removes organic and minerat particulates through natural filtration. In general, wettands of greater size, more dense vegetation, and those which are close to point sources of pollution are considered to be of higher value. Wetiands which are small (<5 acres), tacking dense vegetation, and no# close to point or non-point sources of pollution are considered of low vafue. The GROUNDWATER RECHARGE FUNCTION is defined by the interaction of the underlying geology and soils, and the surface topography. This fundion provides for the movement of surface water inta groundwater systems. Important to this function is wetland size, period of inundation, and depth of standing water within the wettand. High value is given to permanently inundated wetfands greater than 10 acres in size. Medium value is given to wetlands which are seasonally flooded and 5 to 10 acres is size. Wetlands less than 5 acres in size, isolated, and temporarily saturated are oonsidered of low value. The NATURAL BIOLOGICAL FUNCTION is defined by the complexity of physical habitats and biologicat species within the wetland area_ The value given to a wetland depends upon its ability to provide habitat for nesting (spawning), 02'154 Lakeridge-8 Wetlan�ldliFe Report (j incubation, feeding, rea�ng, and cover of aquatic and terrestrial animal and fish species. In additiori, the ability of a wetland to provide support for varying food chains is an important element in value assessment Wetlands of high species diversity, three or more habitat types, unique habitat features, large in size, and associated with a permanent stream or tidal marsh are considered of high value. Wetlands with moderate species diversity, two habitat types, moderate in size, and associated with an intermittent stream or high salt marsh are considered of medium value. A low value is given to wetlands of !ow species diversity, small , size, and isolated. These six functions are rated low, moderate, or high, based on the criteria outlined above. These criteria are guidelines compiled from Adamus (1987) and Reppert (1979) and professional judgment must be exercised in assessing these criteria. Overal! values for a wettand are assigned, based on a synthesis of individuaf values. !n ' addition to intrinsic functions, extrinsic functions are also recognized. These extrinsic functions provide soaal values that have indireet benefits to wetlands. Education and recreational opportunities are most often mentioned as extrinsic functions. Associated vatues are often subjedive and are thus difficult to evatuate. As such, these functions are not rated, but are nonetheless important when considering creation, restoration, or enhancement projects. ONSITE WETLAND VALUATION � Following the function and value assessment process noted above Wetland C was rated as exhibiting a low rating: • Water Quality Ben�ts - This wetland was small and had been impacted by prior grazing and pasture and land management. This wetiand appeared to retain less than 25% of the runoff which occurred within the Iocal area. This wetland also exhibited a limited vegetation diversity as a resuit of prior grazing. The pnmary water quality benefit provided by this wetland was a very limited amount of biofittration of surface stormwater. • Stormwater Storage - This wetland appeared within a topographic j depression and had been impacted by prior land uses. This wettand was focated in a rapidly developing part of tGng County. This wetfand was smal! , and exhibited a very limited ability to store stormwater. • Hydrologic Support - This wettand appeared small, and noted to pond a limited amount of surface water earfy in the growing season. Evidence of seasonai ponding and saturation to the surfaoe was limited. • Groundwater Recharge - This wetland appeared small, and to pond a timited amount of surface water early in the growing season. Evidence of seasonal ponding and saturation to the surfaoe was limited. Q 02�54 Lakeridge-9 Wetian�ldlife Report I I • Natural Siological Function - This wetiand was small, and exhibited a very limited range of plant diversity and vegetation complexity. Avaifable habitat was dominated to young deciduous trees and a dense shrub oommunity. Unique habitat features (i.e. snags, fat{en trees, mature trees along the wetland boundary) were absent. This wettand included a large slash pile resulting from prior forest harvest. ONSITE EVALUATlON - WlLDLIFE WILDLIFE STUDY METHODS The onsite assessment of wildlife species presence and available wifdlifie habitats was completed as a part of the onsite assessment of wetland characteristics. This assessment included both early moming and late aftemoon observations. Species presence and habitat utilization were evaluated following the methods ident�ed by I Homer and Raedeke (1989) and within U.S. Fish and Wildlife Service Publication 80/58 (Mikol, 1980). In addition, the I�Gng County Wi{dlife Study Guidelines (Draft Witdlife �, Management in King County, Issue Paper, 1993) were also followed to assure ' consistency with tlie King County permit process and documentation of habitat types. Onsite activities documented observations of individual species presenoe, the general location of the species sighting, and the life history activity being undertaken. Sample stations were established within the site for these observations. This range of observations were documented because for many of the smaller, less mobile species � (i.e. smail mammals, amphibians) the project site may provide all of their life history requirements (nesting, cover, feeding, and reproduction) while far the more mobile species (i.e. waterfowl, songbirds, medium sized mammats) the project site may be used for only a few of the life history requirements. These more mobile species may depend more upon adjacent habitat for more critical habitat needs such as nesting and cover from predators. It is unlikely based upcx� the existing site conditions, coupled with adjacent land uses, that species which require large areas �f undisturbed habitat woufd exist onsite. ONSITE HABITAT TYPES The site exhibited one primary habitat type that had been manipulated as a part of past land use activities. A pasture plant community dominated this primary habitat type. This piant community had been created in the development of gra�ing opportunities for livestock. Included within this primary habitat type were #wo additionat habitat types. � 02154 Lakeridge- 10 Wetlan�tdlife Report As defined by King County, the �habitat type° best represented within the site was "Agricufturai.° The primary vegetation within this habitat type is introduced and cultivated pasture grasses. One additional habitat type was Mixed Upland Forest-low understory. This upland habitat type has been manipulated and modified by prior forest harvest activities. In parcel A, the entire site was managed and maintained fawn_ The adjacent properties a{so exhibited similar land use actions along with the development of single family homesites. The "wet meadovW' habitat type was identified as present within the central drainage corridor (Wetland C}. This habitat type had also been impacted by prior forest harvest activities and adjacent iand uses. This habitat type was comprise entirely of reed canarygrass. PRIMARY HABITAT TYPES INCLUDED MlNOR HABlTAT TYPES - Agricuttural Lands Wet meadow - Residential Mixed U land Forest-low understo PLANT AND ANIMAL SPECIES OBSERVATIONS Agricultural �ands: The majority of the 12-acre projeet site was identified to be dominated by a pasture grass pfant community. The primary plant species were introduced and cultivated pasture grasses. Tree cover was limited to individual trees, ' Douglas firs. Avian species obsenred within thi$ coniferous upland forest habitat type ' inGuded tree swaltow (Tachycineta bicolor), song sparrow (Melospiza me%dia), American crow (Corvus brachynchos), American robin (Turdus migratorius), house finch {Passer domesticus), Steller's jay (Cyanocitta sfe/len), black-capped chickadee (Parus atncapillus), varied thrush (Ixoreus naevius), and rufous sided towhee �Pipilo erythrophthalmus). These avian species were feeding throughout this habitat type with the greatest number of observations noted atong the edge between this pasture and the upland forested habitat type. This habitat type also appeared to provide cover to many species that also used the adjacent areas, particularly the residential areas. Mixed Upland Forest: A portion of the project site was identified to be dominated by a mixed upiand forest plant community. Total crown cover exceeded 60 percent. The primary tree species was Dougtas fir that had been retained following prior forest harvest. Additional tree species include Westem hemtock, big leaf maple, westem red cedar, hawthorn, cascara, b(ack cottonwood* and red alder. The understory was dense and composed of a wide variety of shrubs and herbaceous species. Avian species observed within this coniferous upland forest habitat type induded tree swallow (Tachycineta bicolo�, song sparrow (Melospiza melodia), dark eyed junco (Junao hyemalis), American crow (Conrus brachynchos), American robin (Turdus migratorius), golden crown kinglet (Regu/us satrapa), bushtit (Psa/triparus minimus}, house finch (Passer domesticus), Steller's jay {Cyanociffa stellen�, pine siskin (Car�luelis pinus}, bfack-capped chickadee (Parus atricapilJus), brown creeper (Certhia americana), ruffed grouse (Bonasa umbellus), varied thrush (lxoreus naevius), rufous sided towhee (Pipilo �� 02154 Lakeridge-91 WetlandNVildfiFe Report erythrophthalmus), Northem flicker (Colaptes auratus}, and hairy woodpecker (Picbides villosus). These avian speaes were feeding throughout this habitat type with the greatest number of observations noted along the edge between this upiand forested habitat type and the pasture areas. This habitat type also appeared to provide cover to many species that also used the adjacent areas, particularly the residential areas. A number of nests were observed onsite and appeared to have been used during the 2002 breeding season. A limited number of stumps and snag trees are preserrt within this plant community. These stumps and snags appeared well utilized as feeding areas by a wide variety of avian species, particularly hairy woodpeckers, creepers, and Northem flicker. A few of these snags also exhibited a limited use by pileated woodpecker (Drpocopus pileatus). Mammal species observed within this habitat type inGuded deer mouse (Peramyscus manicu/afus), shrew (Sorex spp.}, opossum (Dide/phis virginianus), Douglas squirrel (Tamiasciurus douglasir), mountain beaver (Aplodonha rufa), raccoon (Procyon lotor}, and black tailed deer (Odocoileus hemionus). Wet Meadow: An emergent wetland area was identified in the southem portion of parce! B portion of the project site. This wettand represented less than 5°�6 of the total project area, had been greatly mod�ed by prior pasture management and grazing activities, and was dominated by an emergent plant community of reed canarygrass. Grading has enhanced an existing swale that ran through the property. Avian species observed within this fr'eshwater wetland habitat type included tree swallow, violet green shallow (Tachycinefa thallassina), bam shaflow (Hirundo rustica), song sparrow, daiic eyed junco, and American robin. These avian speaes were noted to use the "edge" between the 7iixed wetland habitat ty� and the pasture habitat type. Many of these avian speaes were #eeding and seeking cover either within this wet{and habitat type or within the adjacent upland fiorest plant community. This wetland plant community did not include any woody habitat features. As identified the apparerrt length of surface water ponding resulting from water retention by the wetland would be inadequate to provide spawning habitat for amphibians_ M�VEMENT CORRIDORS As identified by onsite wildlife trials, small and medium size mammals appeared to be moving throughout the project site and into the adjacent areas. The larget of these trails (many of which are logging roadways and draglines) also appeared to be used by domestic cats, domestic dogs, horses, and neighbors. 0 02154 Lakeridge-12 Wetlan�ldlife Report PRIORITY SPECIES Two wiidlife speaes identified by the State of Washington as "Priority Species" were observed onsite during this assessment. Biack#ailed deer and ruffed grouse are noted � by the State of Washington as a "priority species' because these species are regulated as �gameA species. The project site may also provides suitable habitat for other game species such as mouming dove {Zenaida marroura) and band-tailed pigeon (Columba fasciata). STATE CANDiDATE SPECIES A single "State Candidate' species - the pileated woodpecker - was observed to utilize the forested areas onsite. State candidate species ane presently under review by the State of Washington Department of Fish and Wildlife (WDFVV) for possible listing as endangered, threatened, or sensitive. WDFW has developed a list of recommendations for management of the piteated woodpecker tha#focused on the preservation of nesting habitat. As defined by WDFIIV the most popular nest trees are typicaliy hard snags with bark and broken tops within riparian areas. REGULATORY C�NSIDERATION The proposed afteration of lands defined by various federal, state, and local authority rules and regufations as "wetlands" raises environmentat concerns that are generally addressed 'sn the development review process. These concems center around the development's potential adverse impacts to the strueture, function, value, and size of these 'y►retland" areas. Such adverse impacts may include a reduc#ion in witdlife habitats, reduced surface water quafity, reduced water reterrtion, a reduced ground water recharge rate, reduced plant species diversity, and the reduction in the function and value of other associated wetland and non wetland characteristics. U.S. ARMY CORPS OF ENGINEERS - Section 404 Section 404 of the Clean Water Act (33 U.S.C. 1344) prohibits the discharge ofi dredged or fill materia! into "Waters of the United States" without a permit from the Corps of Engineers (Corps}. The Corps has jurisdiction over freshwater systems waterward from the ordinary high water line of a water body or waterward from the upland boundary of the adjacent wetiand. The definition of fiil materials inGudes the replaoement of aquatic areas with dry iand, grading which changes the surface contour of a wettand, and mechanized land dearing in wetlands. For the purposes of Section 404 permitting the Corps makes the final determina6on as to whether an area meets the wetland definition and would be subject to regulation under the Corps program. Currently the Corps has two specific types of permits which apply to wetiand fill proposals. These two types are a series of specific Nationwide Permits and the !g 02154 Lakeridge-13 Wettan�ldlife Report lndividual Permit. The Nationwide Permit process identifies specific categories of work that can be undertaken following a set of specific conditions applicable to each Nationwide Permit number. For example; NV1/P#92 allows for the limited, short term impacts to wetlands for the placement of utilities, and NWP#14 allows for a limited impact to wetlands as a part of the development of a roadway crossing. The Corps has noted several times within ir�formation papers, documents, and workshops that a project proponent that places fill within a wetland without specific Corps authorization does so at the proponent's own risk. The Corps requires an Individual Permit where a proposed activities within an identified jurisdictional wetland area can not be authorized under one of the Natiornvide Permits. Within the lndividual Permit proc:ess the Corps undertakes a much more in- depth review of the proposed project a�d the proposed impacts. The Corps must - evaluate whether the benefits derived from the project outweigh the foreseeable environmental impacfs of the project's completion. STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Proposed acti�n undertaken through either of the Corps of Engineers processes (Nationwide, Individual, or isolated) are aiso subject to the provisions of the Washington State Department of Ecology Water Quality Cerf�cation Process. Projects that may be exempt from Corps of Engineers Section 404 jurisdiction may still require review by the Washington State Department of Ecology to ensure consistency with State water qualify protection provisions. KiNG COUNTY - "Environmentally Sensitive Areas" Ordinance 21A.24 • Wetland and Stream Classes King County regulates adivities in and around wetland areas. Such regulations also require that an undisturbed native vegetation buffer be retained along the upland side of the identified wetiand areas. To assist in this regulation the County has defined classes by which to regulate wetlands, streams, and their associated buffer area. These ' categories are based on such features as size; the presence of endangered or threatened plants, fish, or animals; regionally rare wetlands; wetlands of locaf sign�cance for wildlife or stormwater functions; the number of wettand dasses and subclasses; and percentage of open water. A Class 1 Wetland means a wetland assigned the Unique/Outstanding rating in the King County Wetlands lnventory, or any wetland which meets any of the fotlowing criteria: 1. The presence of species listed by fhe #ederal govemment or state as endangered, or threatened, os the presence of critical or outstanding actual habitat for those species; 02154 Lakendge-14 � Wetian�ldlife Report 2. Wettartds having 40°r6 to 60°� permanent open water in dispersed patches with two or more ctasses of vegetation; 3. Wetiands equal to or greater than ten acres in size and having three or more wetiand Gasses, one of which is open water; or 4. The presence of plant associations of infrequent occurrence. A Class 2 Wetland means a wetland assigned the Significant #2 Rating in the K�ing County Wetlands Inventory; or any wetlands which meet any of the fottowing criteria: 1. Wetlands greater that one acre in size; 2. Wettands equal to or less that one acre in size and having three or more wetland Gasses; 3. Wetlands equal to or less than one acre that have a forested wettand class; 4. The presence of heron rookeries or raptor nesting trees. A Class 3 Wetland means a wetiand assigned a Lesser Concem #3 Rating in the King County Wetlands Inventory, 1983, or uninventoried wetlands that area equal tv or less than one acre in size and that have two or fewer wetland classes. King county defines "Streams" as those areas in King County where surface waters � produce a defined channel or bed, not inctuding imgation ditches, canafs, storm or surface water run-off devices or other entirely artificial watercourses, unless they are used by salmonids or are used to convey streams naturally occuming prior to constnaction in such watercourses. • Required Buffer� King County has established a standard buffer to be applied to a wetland or stream to assure protection of the wetland fun�tion and vatue. This buffer area is measured perpendicular to the defined wetland edge or perpendicular to the iderrt�ed ordinary high water mark of a stream. WETLAND STANDARD BUFFER CLASS WIDTH 1 100 feet 2 50 feet 3 25 feet King County allows the standard buffer to be modified where such actions would provide additional protection to wetlands or enhance the wetland's funcfions (21A.24.320.B). Buffer averaging may be altawed as tong as the total area corrtained in the buffer on the develapment proposa! site does not decrease and the minimum width of#he final buffer is not (ess than 65% of the standard buffer width. 1�' 02154 Lakeridge-15 O WetlandNVildlife Report , _- .. _ _- _ - . . I . I I I SELECTED ACTION PLAN � The Selected Action Plan of the Lakeridge project site focuses on the cxeation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Pian. A primary feature in the creation �f these homesife {ots will be the establishment o#a protective buffer adjacent to the identified onsite wetland consistent with the fGng County Envirr�nmental Sensitnre Areas Ordinance. The creation of these homesite lots will not require the adverse impact or ptacement of fiH within identified wetland area or buffer. 3 _ . � . � . � �. � . . � . . 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'.'�.�.; ��J��'IT�}: — -��-• ^ _ � --��—�"� •..,�.�� I W ( �- � I � I � J m � az _ _ � w a . . . . s. �. �. ■ . ■�. . �. � � � � � .- — � � � � � a z � � � : � � � . . . ,. 1,`�� o � 1 I! ! � ■ �.: � �,r'�„�a �t f i y o,: t ( r i � ; , � • A � , ,� •�' �'i i�.x�,.e ��ri f ��Y }� } ? ��ttV �i i1��1 y �. ' � r • � , , , a :: � � r�" � � M�IIM�T�� N r��et� �r' � `A+ ' , � � y � . , , i„7 � 'f� , � t % . �N M � , • " r� Rk"i��P na r'��YS f�i �� l� � r �g �' � �, .1 i ,f� �'. /�� . � � � � A A�� i��,w��1� j�� ri 1� l+�IY � �� i ta�;'�; �'�1 � f� �� ? �+d� > �r, � /A ` 1 �� ' i = � i'� ^� \// '�, � < , � _.,_,,: _,.--- � � , x-n>�a-,s-�s ra'�*"`:�"^"�-'.'+T,.-,+r,-� b r R � . ,. . .: � .. ., � � � ' ,��. ,' �! � � � r • ' � � �'"'.�`W'� , ' 1''-" ' .�� , � R ! Jr� � � �,� � I �j, �, � � r �'� � "�+ . �� , •. V(� R �' � � �� :!'.":� � � ! , I � ' • , � r ' � � . r ;', �+. , f * � `. �\ R '.. � � � •� R / _�r�Mr��r�� ',. I � �� r w � � �r�r��M�ilA!l�M��;;: '� � � � ■ � � � , ., ., R , ■ • � � � r "� I �. .. i.i �� r �r ( � ! " 'i �R O �� .� � � ' N ■ � o ■ � ' ' 1 s � �� • � �� t ' �; V; , '� G ; � � , ' . ' . ; ;t � :. I � '' '� ;;> . �` " � . , �� rn �;: � R ■ R � � � � • ■ . �'' �l ''i � � fv . '� � ` i � � .. . .. �� ..� � � ' • � "a ' ,� , , r � � � � w M' � . I • � < �, + � . . . • . . ' .rr ,� .. ' I p ��, ��t �� '�,;:f i� . i. 3 r 11 • N �. vi� • � �t +9 � 1 1 � ��; 1 � ��'" i� � �i s, � � � � , - �M� � r 1 � . _�i• � y;:• . ,.`: '"`r f'�` ..�. .r;' n„, �,F , . .11 � � . ! � I � � REFERENCE LIST Adamus, P.R., E.J. Clairain Jr., R.D. Smith, and R.E. Young. 1987. Wetiand Evaluation Technique (1IVET); Volume II: Methodology, Operational Draft Technical Report Y-87, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Mississippi. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. Office of Biological Services, U.S. Fish and Wildlife Service, U.S. Department of the Interior, FWS/OBS-79131_ Environmental Laboratory. 1987. "Corps of Engineers Wetlands Delineation Manual," Technical Report Y-87-1, US army Engineer Waterways Experiment Station, Vicksburg, Miss. Hitchcock, C_L_, A. Cronquist. 1977. Flora of the Pacific Northwest. Univers�#y of Washington Press. Seattle, Washington. � Homer, R.R. and KJ. Raedeke. 1989. Guide for Wetland Mitigation Proje�t Monitoring. - Washington State Department of Transportation. contract number GC8286, task 6. King County Department of Natural Resources. 1993. DRAFT Wildlife Management in King County: tssue Paper. Mikol, S.A 9 980. Field Guidelines for Using Transects to Sample Nongame Bird Populat�ons. U.S. Fish and Wldlife Service publication FV1/S/OBS -80158. Reppe�t, R.T., W. Sigleo, E. Stakhiv, L. Messman, and C. Meyers. 1979. Wetland Vaiues - Concepts and Methods for Wetland Evaluation. Research Report 79-R1, U.S. Army Corps of Engineers, fnstitute for Water Resources, Fort Befvoir, Virginia. U.S. Department af Agriculture, Soifs Conservation Service. Soils Survey of King County Area Washington, Nov. 1973. Washington State Department of Ecology. 1997. Washington State Wetlands identification and Detinea6on Manual_ Publicatiorr Number 96-94. Washington State Department of Fisheries, Catalog of Washington Streams and Salmon Uti{ization, Volume 1., 1975 ?� 02154 Lakeridge- 18 Wetlan�ldlife Report a� APPENDtX A FIELD DATA FORMS � 02154 Lakeridge-19 Wettan�ldl"rfe Repo�t ;,,. � ,..• .�. •, . . . ;. r . _.; ,�..� ':5:,� . . . . �.-.,.. . . .M1'3 �ICaE�, . . . . . . . . ... .....� .. . ' . �a� FOrI'il Routine Wetland Determination Wetland Data Point_ SP 1 P��= ��4� Job Numt�er: 02154 ApplicarWOwner: L.akeridge Developnteat Date: Septembe�10,2002 InvestigaRor M.tfeckert �y; �NoI Fiave vege�tion.so�.or hydrology been disturbecfl �MYY K�9 lNol Is the area a pot�rrtial probleYn�? Stace: WA Vegetation Donr��nt-----Speaes------------------------------------- C«mwn Name--------------------------------saaeum---------,-x cover----M�cacor-- Pe�u a►Pa -----Cdto�f-Wood T�ee 80 FAC Yes Po s bidioc Yes Poa pratenss Bkiegrass,lCenhicky Hprbaceais 100 FACU+ 96 Species tt�at are OBL,FACW,or FAC(ezc�pt FAC-): 50 Co�warr�n Classification: + Remarks aippears to drain vreq Hydrology (Na)Recorded QaAs(descr�e in remarks) WeCand Hydrabgy Indkatars I�]St�eam.Lake.a Tide Gage [Nol iruu�ated [No]Aerial Photograph [No1 Sahrated in�12 inct�es l�1 oa�er(descrine in ren�arks) [No1 Water marks Fiea o�uvatio�: IMoI wa�ur�s [�1��s Depth af Surface Water(m.): 0 [No]Drainege paftems n w�ands Depth ta Free Water in P�(in.): >24 (No]O�dd¢ed root channels in upp�12 inches oepth to s�uratea sa�ls(in.): >u [r�o]wa�-siained� [No]LoCal soil strver c}ata Remarks (No1 Ott�(e�lain fi re�r�arlcs) nww�ed and►r�aged taum epp�s to drain w�l $OtIS Depth Madra Color Mdile Color Mottie T�xhue,Concretions, ��:�--------(�-11�oisl�----—jM�Moist)---Abundance�Ca�frast--------�-------------------•----R��:•---�------------------------- 0 to 6 10YR�3 rane gravewy bam 6 to 18 10YR N3 na�e graveN�r bant Hydric Sois Iridreators [Hol H+stosd ltrol concr�nons [�l Histic Epipedon [Nol Hig►►Organic 96 in Surtace l.ayer l�l SulNdic odor 1�10�S�9 (M°)Probebfe AquRic Mbist R�me lNol Listed on Loc�l Fiydric Soils List (No�Reducin9 Condi�s (Fb]Llsted on Nationel Hydric Sals List [�1�Y'�or Lw►r-Chroma Colors (Pbl Otlter(e��tan�in remarks) Urx't Name: Tazonomy Oralnage Class: (No]Field O�rvatians match rrtap Remarks appears to drain wed Wetland Determination (No}Hydrophytic Vegeta�ion Pres�nt pro]Tlus Da�Point is a YV�fand (11M�hlydric So►�s Pr� (NoI Wetland tiy�oiogy Pr�serrt Rerr►ark,g wetiand cideria NOT met app�rs to drain wel � Page 1 of 9 r ...-,. . _ .. � .. . , _ _ . .. .. . . ., . . ' . '. . - ' . �. _.'841� Data Fonrt Routine Wetland Determtnation Wetland Data Point: 3P 2 Projec,t/Site: L.Alceridge Job Nunber 0215t A�IiprrtJOvme� t.s�l�erid�e Drvelopment QaGe- Septe�rr�ber 1@,200Z Inv�or M.Heck�t Ciy: [No1 Have vegetadion.svAs,or hydrdogy been d'esturbed? �Y �9 [No]is the area a poterMid proWan areei? State: WA Vegetation ocm�na��t------s�c�--�-------------------------------------con.r�on N±rne----------------- --Scntun.----�------X Cova----h�_d_��c__aR'-°'--- �Y.Hirn�ya --�-----.------- Stwb 3Q FACU Yes Rubus Piocerus P..l.Musl. B Yes Polygonum cuspidadrm Kndweed,Ja�panese Hmbaceous 40 Ni No Phalans anindnacea G�ass,Reed Canery Herbaceous 1Q FACW %Species that arc OBt,FACW,or FAC(ewcept FAG): 0 Cowardin Cla�ssfficatlan; Ret�rks appeara to drain weell Hydrology [t+ol Reooraea Data(aesaibe in rertwrks) wefland Fryaolopy Malcatwa l�I Str�m,Lake,w Tide Gage jNo]Irwndated � �lol Aeda!PhotograPh IAIo]Saturated in tipper 12 inches tNol o@xr"(aescribe in remaiis) ENoI Water m�rxs I Field Obset►rations: INo]WaRer lines [Mo]Sed�meiR de�ita oepttt ot Surface water('m•): o [►+b3 Draa�elge Paltems in wettan�s Depth to Free Water in Pit('m.): >2t [No]O�ddized root channels in upper 12'aiches Depth to Satwated SoiFs(m.): >24 (l�i�]Water-ctained baves [�I Locxl sal survey daca Rematks [Nol Otl�er(e�la+�in►ernarks? fJ oentraf by N boundary appears bo drain wes $OI�S Depftl Nlatrbc Cobr Nbttle Cobr hbttle Te�Qure,Cotxxetions, C�•�.--•-----tMunse�_Moist)--..----jtJq..-�seu Moist2.__..Ab+xidanca!Cor►trast---------•------------ -------Rh¢ospheree st�,--- -- -- -- - �--�-- 0 to 18 10YR 3/3 rwne gtavelly flY ------------------�-----------•�-•------•---�------------ ------------------------•------------- ------------...---- -- ----------------...._...�-------- ---------—---- ---------- l�Jyrkic So�s 1►�aficatas lNo]Histosa (Nol conae6ons [No]Histic EpiNedon (NoJ Hi�Oryardc%in Sixface Lay� [�1 Su��aic odor !�10��s [No1 Probable Aquitic Mo�st Reg'vne lHbl Listed on Local Hydrlc Shcs List [Nol Reducing Co�ditions (Noj Listed on National Fty�ic Sotls Lisi (Nol Cteyed or Lovr-chroma Goto�s [M4l�t��) Urut Name: Taxawmy. Draetiage Class: [No1 Ffeld Observations match map Remarks appeers to drain we11 Wetland Determination P'bl�Y'�P�M�V�P►�esertt lNo)Ttus Dats Poht is a Wetland R�l M�►ic so�s Present [�l Wetlaula Hydrology Preserrt RemaAcs wetland ar�eria NOT met app�rs to drair►weN O Page 2 of 9 �a -a::SY-� _ ' . � � � . � .. . . �� .;':la;,� . . . . .. . . .... . . � � ..: ,_ , . . . . . . . . .. ..'�.i.a.::+AS� Data Form Routine Wetfand Determinat��n Wetiand Data Point Sp 3 Projea�site_ L.aherwye Job Nuriber: o:�sa APP�� -a*��9�� Date: Septe�nber 10,2002 Inve�tor: M.Heckert �y: iNol Fla►^e r��Rion.so�s.or hY'�'�9Y bcen dr�rbed9 CountY IGn9 INoJ Is tbe area a poma�Wal problem areal StaDe: WA Vegetation oornirw,t-----s�----------�-----------�-------------------con.rwn Nsne------------------------- -- -- -----Sfrattm----------%C°v°r-•---��---- Yes Juncus Efirsus L Rush,Soft He�ceo�s 30 FACW Y�s Agrostis Tenuis S�th Be�,Cobnlal Harbacxais 30 FAC Yes Agropyron t�pens Quackgra� Herbaceous 30 FACU ---�------------------- --------�----------------------------�---------------------------------�----._...---•--------------•---...-----------------------------•-------�----�------------------------- %Species that are OBL,FACW,ar FAC(except FAC-): �6 Cowa�din C�sificatlon: Remarics old raad bed Hydrology lNoj Recorded Data(descfibe in►emarl6} VYetlan4Hyal►olo�Ir�dcalDrs lMol sere�,►.[..alce,or ride Gage tWol�nw,daDea [Ha]Aerial Photo�aph (Nol Saturated in upper 12 ir�es t�I other(descriae�n remarks) tNol water marks Field Obsenratjons: I�l Water ines I�1 Se�merrt de�a Deptt�af Surtace Watet(in-): 0 [�l�P�ema in w� Depth to Free Water k�Pd('m.): >Z4 [NoJ 0�6diZed rooR cb8nnels in upper 12 inches Depth to SahYated SoiisCu�-): >Z4 (NoJ Water-sta�ed k+eves [No]Locai so�sutvey Qata Remarks [Nol Otl�(ea�lain in rernatics) IV11V corr�er app�rs bo dran wpll j I $0115 Deplts Nlatr'vc Color Nbttle Color Moiife Te�Rure.Caxxetions, r \ ��/��` � . . ` p . �(! 1�_1..._._.____..l'�'.�:.^._�^��._.'"_... _.'."...'__�___.__.._._/__._'.__'___"._..'_.___,..'..'.___""._._.___'__._."_."'._.."___�.__"_"....____�1��1_--^................'__'��.�_____".____' ... 0 to 8 10YR 3/3 none gravveily fip I{yd�ic Sols ln�fcatois (�ol H�tosa P�ol c�o� I�1 H+�EP�P� I�l Hiph Orgarrc%in Surtace Layer [�1 S�rdic odor (Nol org�,ic str�lans INoJ Probable Aquitic Moist Repime Pdol l.iated on Loal liydric So�s Lfst lNol R�cond'i6ons (trol Lestea on Naboc�ai Nyd�ic so�s I.ust l�l G�or Lo�w-cnroma colors [Nol Ofher(e�lain in remarks) UnR Name: Taoaonort�r. Drainage Class: [No�Fieid Obs�rvations match map Recnart� geo tech hbric at 8' Wetland Deberrnination [�I Hra►�r��+�+�� pro)rn�s�aa Po�nt is a We�d l�l�►�sods Preseca �l w��sr� Remarlcs wattand cnTerfa NOT met appears to drain well �� Page 3 of 9 �ata Form Routine Wetland DeteRnination WeUand Data Point SP 4 ProjecUSite: Lakeridge Jab N�t�ber. OY154 ApplicanVOwner. lakefidge DevNopmerlt Date: Sep�ember 10.2002 Invesii�tor: M.Ficdtart C�ty. [NoI Neve vegetation.soas.or hy�drdogy becn d�sturbed? CantY K+�9 INoj is the area a poter�ial pudem area? State: WA Vegetation oomina�,a-----s�eS-------------------------------------- ------c«n�on niarne.----�-----------------------------saatun---------x cover.---.t�afcator---- Yes Ak�us rubra Alder,Red Shrub 20 FAC Yes Sabrlasisndra VYdaw.Pacific Sluvb 30 FACW+ No Pofwh�s bichocarpe Cdbon-Wood sap Shnib 30 FAC -- --------------------------------•--------•------------------------------�-------•-------------------------------•-------------------------------------------------------�---------- %Speciss t�at are OBI,FACW,or FAG(except FAC-): 100 Cowar�n Ctasslfication: Remarks Hydrology ------- — -- - — — - (Nol Recorded Da�a(desuibe in remarks} WeEland Hyc�afngy lr�dcatws (No)Stream,Lalce.or Tide Gage (Nol Inundabeci [Nol Aerial Phatograph INo1 Satixaded in upper 12 incl�es INo]Other(desaibe in remarlcs) [No)Waber marks Fie[d Qbserva6o�: [Yas]Water lines [�I�� Deptt,ot surtace water(in-). 0 [Nol D►airu�e c�attems in wenanda Depth to Free W�in Pi�'in.): >24 [No)O�dd¢ed root d�eru�eks in upper 12 k�ches Depth to Sattxated SokS(-m.): >t� (Noj Water-stafned leaves [�l Local soi survay daa � Re►narks [Nol Olt�(e�n in rerrwrks) smaN pre+�oiusy-fdfed de�xesaion $OI�S I Depth Matrfic Color MoWe Cotor Mottie Texture,Concrdions, � (in-�------------tMcx�sell-Mo�st}-----._IMur�seC_Moistl_---Abgudanoarcontrast------------------•---- •. —Rt�¢osptierea etc.--------------------------------- li 0 to 12 7 UYR 4f3 none -- -- -gravelly ; 12 to!$ t 0YR 25/2 none s�ty bam Nydric Sois he6cators It�to�Histosd jNoJ Conaetions [No]Histic Ep�ecion (No]NiBh Orpertic%in Surface Layer INo�5utf4dic Odor (Noj Or9anic Stre�dn9 L�1 Prubabie Aqudk Moist Regirne �IoJ Lisied on Lncai Hydric SoNs i.ist INoI Reducing Cona;bor�,s (Moj t�ea on Nationar Fl�rdric sals t.ist ' INo1 Gley�ed or Low-Cfxoma Cobrs (No]Other(e�ialn fn iemarlcs) Urut Ptame: Taxorwmy � Drainnape Class: [Noj Fieid Obs�vatloRs tnatc�h map Reynarlcs �� Wetland Determination � IY�I HI��Y�V�Pneser� lNo)This Data Point is a Wetland I l�l��soils Prase�c t�l w�M�'��'reaenc Remarks wetland crYstia NOT met app�rs to�wetl 32 � Page 4 of 9 Data Form Routine Wetiand Determination Wetiand Data Point SP 5 Projecvsice: LaOc�riaye .mb N+,mber o21a4 Appiic�tlOwrxr. L.akeridge Devaloprnent Date: SeQternber 10,2002 investi�artor: M.Heckert CRy: l�l Iiave vegetation.sals.or hY��9Y�� Y �9 I�1!s the are+a a po�tential preblern area? State: WA �/@9@tAt1011 Dorrw�ar�t------Sp�cies-----------------------. Cortrrwn Nyne-----__....----------_--__.---- Strtihm-_---------%Cover--•—I�cator - ---------- - ------ Yes Thule picata Cedar,Westem Red T►ee � FAC Yes Ranuncudus acrts Sutte�-Cup,Tap Herbeiceotts 60 FACW- Yes Pseudolsupa Men� FIr,Douglas Trae 80 FACU' No Agr»stis Tentds Sibtir. Bentgrass,Colon� Herbaoeous 10 FAC -------------------------------�---�----�-----------------------�--------�-------------- ------ ---�-------•--�----�----�-•--------•------...---�---------------------------- -- -------------- %Species that�e OBL,FACW,or FAC(e�acept FAG): 86 Cahrardin C�on: Remarks app�s to dra�weN Hydrology l�l Recaded Da�a(desa�e in rerrnrks) WetJarid Hydmlogy lndcators lNo1 Streaun.I.ake.or Tfde Gage [No)irnux�ted (Noj Ae►ial Phatograph [Noj Sattuated in u�per 12 inches l�l other(descnbe in remarks) [No)Water marxs Field Observations: INoJ Wa�ter lines �NO�Se�rnent deposits Depth of Su�facs Water(u�•): D I�1�s�P��in�ds Dep4h to Frce Water in PitCm-): >Z4 [Noj O�ddized root channels in upper 12 inches Deptt►to Satutat�ed Soils(in.)_ >24 [Noj Water-�iained leaves I�1 Locai sod suvey daRa Ren,artcs [�1�(��) appears to drain wd! SOi�S Depth Matrnc Color MoEtie Cotor Mo�ittk Te�Q�ue,Concrelior�s, (ks:�-•----------(MtmseN_IlAoist}_..---.--j�At�r�ll Moist).----Abtmda�calCa►gast---------•-----.----- - - ----�--•------h�es etc'---------- --------...------ 0 to 18 10YR 25/2 none man�xe durr�p pae -------------------------------•-------�-------------------�----�---------��--•�------------ ----------------------•----- - - ---...---._ ------- -.---- - �- ------ Hyd�ic Sols lnacatars puo]His�osot l►�1� [Ho]Histic Epipedon [No)High Organic%in Swface Layer [�oI surr�odor (�ol or�c S�a�ar� (NoJ Probabie AquRic Mast Regime INo)Listed on Local Hydric SoNs List l�1 Reducirg Co�ditions @11oJ L�on Na�tionaf Hydric Soiis t.ist [�l G�or L.ovv-chr�orria ca«s INo1 Other(exp�n in reanarks) Urot Name: T�ronomy: Drai�age Ctass: [No1 Field Obsefvatio�[riatch map Remarics m�wre dump pile Wetland Determination f ----�--- - [Yes]Hydrophytic VegeCation PreserK (No]This Data Pdnt is a Wetland (Yes)tirdric SoiFs Present (nol Weuand tiydrdoyy Pre�r,t Remarks manur+e dumD pGe appears to drain w�eAl � � Page 5 of 9 II Data Form Routine Wetiand Determination Wetland Data Poinfi SP 10 PmjecUSite= Lake�idge Job Number. 02t64 ApplicarrUOwnx: Lakeridge Devdopment Date: Sep�nber 10,2902 Investigakor M.fiecicert C,�Y [NoI Have vegetatlon,sals.a hyd�oagy neen disturbea? co�x,tY lGrg INoj Is the area a poterrtiaJ problern ar�? State: WA Vegetation Dorninam---species------- ------- ---- --------Co�m�on-Narr�e --- - - -- - - Strattm..._.- ---X-Covu -Indicator Yes Agros&s Alba L Redtop Herbaceous 100 FAC' --- -- - ..- --- -- --- _- - - -- -- ---- - --- -- - -- ------ -- - ----- ---- ------ -------- - --------- %Species U�at are OBL,FACW,or FAC(except FAG): 100 Cowardin Classification: Remarks appears to dtain rveH no r+edaa chara. Hydrology I�l Recorded Dada(d�scnbe in remarks) Wet/a�d Flydrologyln�cators [�I Stream.take,or Tide Gage [Nol Irnu�dated (Nol Aeriel Photograph (No]Saturated in upper 12 inches [No}ou�r(aegcribe in rernarks) [Nol waoer marks Field Ob�rvaBons: I�I Water lines lr�ol s�m�t de�ts D�t,or ss,rtace wacert�-Y 0 [No]�rair�ge w�ttems in wetlar�ds Depifi to Free Water in P�(in.): >24 [NoJ O�zed root channels in upper 12 ir►cties Depth ta 5altxated Soils(n.): >24 [No)Water-sfained leaves [NoJ Local soa stavey data Remarf� [Noj Other(e�qin in rernarics) �o hydro characteristics apprars to drain weR SOI�S Depth Nla�c Cobr [�AAottle Cobr Mlohtle Te�QRure,Concretio�ns, Lm,}-----------tM�seil Moist�---------(N�cir,seli Moist�-.-•Abtu�dar�oa/Contrast-----•----------------------------RF�¢�phe�es e�C°--•-------------•------------ 0 to 8 101fR 252 none sandy loaur► ----- 8 to 16 10YR 3l3 none 9ravepy bam ----------------------------------------------------------�---------------------------------------�----.._------------------------------•-------------�---•-------------------------••------------- Hydric Sois Ind�catavs [�I Histosot (ntoj Corrctelions lNo1 Histic Epipedon (Nol High Organic%in SurFace layef (No]Sutfidic Odor t�l��9 [Nol ProbaDle Aqtutic Nbist Regime ((�io]Listed on Locaf Hydric 5oilss L.ist [�]R��9 C�� INo�L'sted on►Vational Hy�ic Soils i.ist [No]Gleyeci or Lanr-Chrorna Cdors LNo1 Ott�er(e�taki in rmnarks} Unic IVame: Taworwrt�y: Drait�age Ctass: (No]Field�match map R�rrarks no redox appears to drain weeU WeNand Determination [Yes]Hy�drophytic V�on Present (No]Ttus Data Point is a Welfand l�1 M�G soas Pre.s�eret �No}Wetland Hydrology PraqeM Rerr�artcs wetland criteria NOT me�t appears io drain wea � Page 6 of 9 Data Form � Routine Wettand Determination Wetland Data Point: SP 11 Projed/S�e= Lakaidge Job Number 02154 APP��= ��K Date: Saptembef 10.Z002 Imestigator. M.HecfcM �r. [No)Have veg�aRion.sa7s,or hydrology been cGsturbed'? County. lGng [�I Is the aree a potentiat probtern ar�? State: WA Vegetation Dominar�----s�---------------�- c°m-'-�°"IY�-'-'-e---------- --�--- - • --------------------- Stratun--_---,------7L Cover___ind�cator-- ------ ----- Yes Phafaiu aiundmacea Grass,Reed Canary Fie�baceous 100 FACW � - -----------------•- %Species tt�at are OBL,FACW,a FAC(Pxcept FAG): 10Q Cowardm C�: PEME Remarks aPP�rs to drain Poor�Y root oxY Hydrology INo]Recorded Data(descrbe ir►rernarks) Wetland Hydrology Ir►�cators INo]Strearn.Lake,ar Tide C�qe [No]Inund�ed (Nol Aeriai Photo9�aPh (Nol Sadtaated in�per t2 inches IHo)onier(desaibe"u�re►r�rks) [Yes]Water marics Fiek!Observations: I�I Water fines �I�� o�a�or s�taoe wace�{m_�: o [Yesj Drau�ge p�tems in wetlarxls Depth to Free Water in PR{in.): >24 [Yes]O�ddized root ctrannels�upper 12 Qtdies Depth to Saturated Sois(m.}: >24 [NoJ Wat��ined 1�ves [No)Local soY survey data Rernartcs t�l�(��n�) appears to drain poorly ' $O1�S Depth Matrut Color MdUe Cobr Mottle Texture,Conct�etions, {�rt�-----------{tYh�e1-IMoFst)-------.'�Ata�sell Mgstj-----Abut�da.'x�/Canttast----------•-----...-----------Rh¢�t��etc------------ ------------------------ 0 to 18 10YR 25/1 none sitt bam Hydric Sa7s Indcators [�1 H� l�l canaet;ons (No]Histic Epipedon (Yes]High OrgaMC%in Surface Lsyer � i�l Sutfidc oaor l�l��r►9 [Yes]Probahle Aqw'tk Moist f2egime �IoJ L.isted on Local Flydric Sals L�t [Yes]Reducing Con�tions �No}Listed on National Flydric Soils Lisi [Yesl Gley�d or Low-Chroma Colors lNol Ott�er ie�qKa�n'u�re�riarks) Unit Name: Taxonorny: Dr�e Class: �Nol Field Observations match map Remarka appedrs to drain poorly Wetland Determination IY�I�Yd►ePhYtic Vegetation Present [Yes]Ttrs DmRa Poinrt Ps a Wetland (Yes]Hydric Sa1s Preserrt ', (Yes1 Wetl�d HY'�9Y� Remarks wettand criteria MET appears to drain poorty ' � Page 7 of g 'I � Data Forrn , Routi�e Wetiand Determination Wetland Oata Point SP 15 Pro�ect/Site: L.akeridge Job Ntanbet: 02154 �� D�e: Se�tdrfber 10,Y002 lttvestigator: M.I�lecicert ��Y t�l�"'e�.sods.or hy�drology been d�sturbed? Coir�t�r. IGrg [NoJ Is the area a potential problat��ea? St�e: WA Vegetation oomi�wrrc----s��.----------------------------�-----------ca„Ynon-M,rr,e------------------------------Str,tu,,,..---------x.Co�,er.._..I�cator_._ Yes JuRcus Eflusus L Rush,Soft Herbeceous 30 FACW Yes Phalaris arun�nacea Grass,Reed Canary Herbaceous 50 FACW No Agrosffs alba Redtop Herbaceats 10 FACW ------------------------ ---- ------------------�-------------------- --------------------------�--�-----------------------------._-�------�-----------------------------�--------------- 96 Species tlwt are OBL,FACW,or FAC(except FAC-): 100 Covvarc�n Classtf�cation_ Remarics aq�pears to drain weq no r�oot oxYdation Hydrology t►rol Recorded Data(aescribe in rema�ks) weaand!-tyaErorogy rn�icarois R'b1�.�dce.or Tide Gaye [NoI�nundated �NoJ Aeriai Phdograph [No1 Saturated in upper 12 inches [�]�t�er(descr�e n remar�a) [No1 Water rnarks Fietd Observations_ I�I Water�nes i�l�� Uepm or sur�aoe Wacer(ei.): o iNol�►a�ge pattems in wetlands 'I Depth to Free Wader in Pit('u�): >Z4 INo]0�6d'rced root chant�els�uppe�12 inctks ' Depth to^�edurated Safs('u�.): >24 jNo]W�er-sta�ed leaves jNo)Local sal surve�r data Remarks INo)Other(e�laa►k�re�nark�) at edge of depres�an app�ts to drain well SO1�S Depth Matrbc Color Moftk Color Mdtle Texture,Concretiwis. {!n�------------(Munse!-�Aos��--------�Atst:sel!Mofstl.----AbundancrJCanfrasS--------__...____ -------------Rtbza�pt!eres etc: Oto6 t0YR312 naie ---------�-------�------------------ oomPacted 9rav�lY bam 6!018 t 0YR 313 rane oompadeci graveqyi foam -----•-----•------------------•---------•---------------- �------------•----�--....------------- �--------------------------------------�----•--�-•------------------------------------------ Hydric Sais JnaG�ato�s [�I Histosol (nto]concretions l�l Histic EPiPedo�n [Nol F�gh Or�C%in Surface Layer [�l S�� I�1��9 (No]Pro6able Aqu�ic Nbist Regime �!o]t�sted on Loc�Hydric Sals List [�]R��9 C�� 1�)l'ested an l+letional Hydric Sorts List , [�1 G�1�or Low-Chrama Colors lNol Omer(e�lain in remarks) Unit Narr�e: Ta�oonotrry. Draicr�qe Class: [Noj Fleld Observations mabch rriap Remarks ' �eve�ely c�ed aPP�rs to drain wea Wetland Determination (Yes]Hydrophytic VegeW�ion Present (I+io]This DaMa Pant is a Wetiand (Noj Hydric Soas Presecrt [No]Wetland Hydrofogy Preserrt Remarks wetland criteria NOT met appears to drain well O Page 8 of 9 _ Data Form Routine Wetland Determination Wetland Data Pant: SP t8 Project/Site: L�teridt,�e Job Nurriber 02154 Appticarrt/Owner. Lakeridge Deva9opment D�e: SepEe�nber 10.2002 Investigator. M.Fleckert Cit�r. (Nol tlav�e v�egetation,sdb,or hydroloyy been�Sturbed'T Co�r�tY K�n9 [Nol Is the area a po�ential probfern a�ea? Stabe: WA Vegetation oomirwnt----Speaes-,-------------- - -- - ------Camwn Narne -- -- -_...__- .. Stratum --- %Covet --Ir�cator Yes Phalarrs erunrinacea Grass,Reed Canary Herbaceous 10Q FACW -------------------------- ---�--------------------------•----- -- ----------._-- - - - ---- -------- - �-- --- --- ---- ------- ------------..... 96 Specie�s tltat are OBL,FACW,or FAC(except FAC-): 100 Cowatd'm Classifiption: PEME Remarks appears to drain pooriy Hydrology ----------- - - INoJ Recorded Data(des�ibe in remarks) WeOand Nydre�logy In�fcators t�]svearn.Lake,or ride C�age [No]�nundatea l�l��P�9� [Noj SaRurated�up�per 12 inches l�l Otlier(describe in remarks) [lfes)Wader marks Field Ob�rvaaions: [No1 Water le�es INoj Sedm�ertt depoeits Deptlt of 5urtace WaterC�-)= � IY�I��P��in wetlarxis Dep�l,co Free water in Pit(n.): >zt [lres]o�dd'¢ea roa cnamels in upper 12 i�es Depth to Sat�uaQed Sals('vi.): �24 [Noj water-siair�ed leaves [Noj Local so�sutvey daRa Re�narls lNol ott�(e�af in r+e�narks) aPPears to dram PoortY $0115 Depth Nla�uc Color Mottle Color Ma�ttle Texture,Concre6ons, f�:1-----------(Nh,�eo-Moist�--------�tNunses Moist)----Ab�rsdar�cdcantrast.---------------------------R�zo�h�etc.------.-------------.-----.. 0 to i 8 f OIfR 2.52 10YR 516 ptam and oormion oor�etbns s�y loam -- Hydric Sois lndreatas � I�1 Histasol (Yes1 Corxxe�ons 11Vol H�tic EPiPeda► [Yesl High�t'9a��ic%in SurtacQ Layer � lMo)SulfEdlc Odor [YesJ Organic 5tr�ldng [Yes]ProbaWe Aquitic Moist Reginte lNo1 Listed on Local Hydric Sa7s l�st [lresJ Reduang conadions (Noj listed on Nabonal tiydric soits List (No1 Gteyed or Low�Chroma Colors jNol Ofher(eo�{ain in remari�,) UruZ Name: Taoaonomy: Dralnage Class_ (Nol Field ObservaUons maach map Rernarks �ed appears to dran poory Wetland Det�rmination (Yes]�ty�dropttytic vegetation Present (�res]7his flata Po�nt is a Weuand [Yesl Hydric sods Present [Yes]Wettand Hydrolo�y Present Remarks w�etland a�ia MET app�rs to drain poorly , O Page 9 of 9 � C�i- y�-c1 .�� `��s� � � onsulting o �� ; J - July 18,2003 Mr_ Wayne Jones � Lakeridge Development Inc. P.O. Box 146 Renton, Washington 98057-0146 RE: Additional Sensitive Area review for Liberty Plat, King County submittal L03P005 � L03P006 Dear Mr. Jones, In response to the letter of from King County staff I have conducted an additional review to assess the area cited in the letter as requiring additional assessment. Ptease consider this an addendum to the WETLAND EVALUATION AND DELINEATION REPORT AND WILDLIFE HABITAT EVALUATION, LAKERtDGE PROJECT SITE, by Habitat Technologies, November 5, 2002. The area noted in the response is tocated in the southeast portion of the eastem portion of the project site (see attached map)_ Onsite assessment of the project site following the proc�,edures outlined in the Washingfon State Wetlands ldent�cafion and Delineation Manual (Wash. Manual) and the Corps of Engineers Wetlands Delineahon Manual (1987 Manua!) resutted in the identification of NO area that exhibited hydric soils, wetland hydrology, and hydrophytic vegetation consistent with the established criteria of both the Wash. and 1987 Manuals. This area had been impacted by prior grazing and pasture management activities, and active and on-going lawn and pasture management. ONSITE EVALUATION -WETLANDS � Onsite assessment and evaluation was conducted on July 7, 2003. Wetland assessment within the project site fo8owed the methods and procedures outlined in both the Wash. Manual and the 1987 Manual. The site is an open meadow, unti! recently utifized as a livestock pasture. A road drain passes under 162"d Avenue at the junction with 136�' Street. This roadside ditch continues south a{ong the side of the road thru approximately the north one-hatf of the p�oject site. At approximatefy the northem boundary of the pasture, it tums slightfy ._ southeast and transects the southeastem portion of the project site. Rom the southern boundary of the project site, a ditch conveys surface water west to a cuivert south of the � eastem portion of the project s�te. � P. O. Box 731695 • Puyallup WA 98373 02154 Lakeridge-1 � 253-732-6515 mheckert@qwest_net 360��"d Rep°rt �J�� " � . ��.e. �1 � . . � . � . . . � �.. .��.�� k y:a� �s ,, . -,�;,,i.:. _ ti� " � � r #=,.c�,_�'. � � '. . . t� FIELD OBSERVATION • Vegetation A mature managed pasture/lawn ptan# community dominated the evaluation site. This plan# community was composed of a wide variety of invasive and seeded grasses. This plant community inciuded colonial bentgrass (Agrostis tenuis), meadow foxtail (Alopecurus pratensis), velvet grass (Holcus lanatus), reed canarygrass (Phalaris arundinacea), bluegrass (Poa spp.), fescue (Festuca spp.), orchardgrass (Dactylis giomerata), quackgrass (Agropyron repens), bracken fem (P,feridium aquilium), westem yarrow (Achi!!ea !a�c.,!osa), th�stlP, ca+s-ear (flYRx.haeRs s�p}, soft�.�sh (��un_cus effusus}, tansy (Tanacetum vulgar�), dandelion (Taraxacum officinale), buttercup (Ranuncu/us repens), curled dock (Rumex crispus} and clover (Trifolium spp.). These mature trees formed open stands across the treed portion of the site_ A few mature Douglas-fir trees were present along the westem boundary_ Additional tree spec�es occumng onsite included Westem red cedar (Thuja plicata) Sapling red alder (Alnus rubra) were colonizing the meadow, black cottonwood (Populus tnchocarpa), cherry (Prunus spp), and cascara (Rhamnus purshiana). This plant community was identified as non-hydric (i_e. typical of uplands) in character. • Soifs As identified by four sample pfots (data attached) throughout the project site, the site exhibited a soil profite typical of the Alderwood soii series. The soil was defined as gravelly sandy loam with a soit matrix cofor of dark brown (10YR 3/2) to brown (10YR 4/4)_ These soils did not exhibit redoximorphic features such as prominent soil mottles, oxidized root channels; or glayed soil lavers withiri the first 20 inches of soit depth. Soifs - � - withirr this area did not exhibit"hydfic" characteristics: � • Hydrotogy � - Along the westem boundary of the evaivation site, evidenoe of the passage of water was documented. A culvert passed under 162"� Ave. (flowing west). This surface drainage was contained in a ditch flowing south along the road to approximately hatf way through the evatuation area. The dramage c,�.irved slightiy to the west and through the southem portion of the site. In the southem portion, the drainage ditch became less defined, and continued to the southem boundary in an undefined channei swate. F�om the southem boundary, the surface flow was collected into a defined ditch which flowed west to a cutvert inlet. This drainage appeared to be created within an upland area, as evidenced by the soits, and was assuming hydric characteristics as a resutt of the direction of roof and street runoff through the site. o2,sa�k�-z 41 Addendum Wetland iteport ,i '� � ��:- x ��`.: �� . • . +'�A»�'l�r,jt K^� �� j� $. H W k R _ �l _ `� �d1:tir:F;s!:x'�,-:.. a,. � . . . .�i{ FINDINGS AND CONCLUSlONS Onsite assessment was completed on July 7, 2003 fotlowing the methods and procedures defined within both the Wash. Manual, the 1987 Manual, and the WDNR Forest Practice Rules. This assessment ident�ed that no area on the site, or within the immediate vicinity of the project site, exhibited all three of the established criteria for designation as `wvettand'°. The entire site would be best defined as upland unmanaged pasture. No area was ident�ed onsite that would meet the criteria for designation as a "stream." Thank you for allowing H 8 S the opportunity to assist with this project. Shoutd you have any questions or require additionat assistance please cal! me a# 253 732-6515_ � Sincerely, , �� I � Mark Heckert � Senior Wetlands Ecologist . � . � I ,- I ; . �; � . � 02154 Lakeridge-3 � ' Addendum Wetland Repat � Job Number. 02154 Data Forrn cay. Routine Wetland Determination 1�Uetland Data Point SP 20t ProjedfSde= LFberty Lakeridge Date: July OT,2003 ApplicarMAOvvner. L.akridge Development CouMy: King Investigator M.Flec�ert State_ WA [X]Do normal ciram�stances e�st on ihe s�Te? ---------- Community IQ IKeadow ------ [ ]Have vegetadon,sods,or hydrology been disturbed? Sta6on ID: I 1 Is the area a potential probfem area? Plot tD: Vegetation Dominarrt Species ___ _ Common Name_ _ %Cover_ Indicator Herb,aceous X Ag►osfis Tenuis Sibth Berrtgrass,Colonia{ 50 FAC X Dactylis glomerata Grass,Orchard 50 FACU Shrub Rubus procerrrs Bladcberry,Himafaya 10 P!I T ee X --- Pseudots�a Menzie�Mn_bel) F�iryDouglas ------ --- 25------ FACU'---- .- °k Species that are OBL,FACW,or FAC(except�AC-)_ 33 Cawardm Ctassification: Remarks appears to drain wetl Hyd rology �rima,y weua�Hya►oro�y r,��..3ro�►s seoor,aa►y Nyc�oroy1 r�ro� [X)Recorded Data(descxibe in remarks) I ]Inundated [ ]Oxidized rooR drannels [ l stream,Lake.oc r�de cage [ l saturated u,u��2 inc�es [ ]wa�er-stained leaves I 1��9�ph [ ]Water marics [ )Local soil survey data [ ]Other(descxibe in remarks? I j Drift lines [ 1 FAC-Neutral test F+etd Observations: [ I Sed�mer►t deposds [ I omer(e�,�ain�n rema�cs> Depth of Surface Water(inJ: 0 � ]Drainage pattems in weUands Depth to Free Water in Pit(in.): >24 Depth to 5ahxated Soils(in.): >24 Remacks up slope of ditched swale � SOI�S Depth Hw. Matrix Mottle/2r�d MotUe Texture, �n_) Color -- Color Abundanoe Conhast Strudure,etc_ ------- 0-8 A 10YR 3/2 Sandy Loam pebbfes �-iS B 10YR 4.�4 Coarse Sandy Loarn Nydric Soi/s Indicators . [ j Histosol [ j Concretions [ )Histic Epg�edon [ )Ffigh Organic%in Surface Layer [ ]Suifidic Odor [ 1 Organic Streakmg . � . ... _ . .L 1 ProbaWe Aquatic Mast Re9ime- - � [ l L'Rsted on Locat Hyd�c Soils List . . . ' � I j Reducing Cooditions [ ]Li�d on Nationat Nydric Soils List..-_ • . -. . . _ . . . ( ]Gteyed or Low-Chroma Colors � . I l Othe�(e�lain in remarks) Unit Flame: Taxonany. . Drairsage Class: [Xj Field Observations match map Remarks appears to drain wel{ Wetland Determination [ J Hydrophytic Vegetation Present [ ]This DaFa Point is a WeUand [ ]Hydric Soils Presert [ J Wetland Hydroiogy PreseM Remarks w�etland cri�eria NOT me.t appears to drain well \J Paae 4 of 4 i ' Job Number: d2154 Data Form c,ey: � Routine Wetland Determination 1Metland Uata Pant SP 202 ProjeWSite: Liberty Lakeridge Date: duly 07,2003 I AppC�canU�mer. Lakridge Development County. fGng Investigator. M.Heckert State: WA IXl Do normal aramestances e�dst on the site? ---------- — Community IU Meadow -- f I Have vegetation,soils,or hydrology been disturbed? Station IQ [ ]Is tbe area a potentiai problem area? Pbt IQ Vegetation Dominant S e�cies Comrnon Name___�_ _X Cover Indicator Herbaceous � X Lofuscomicufatus Trefoil,Birds-Foot 40 FAC Shrub X Rubusprvicerus Bladcberry,H'enalaya 90 NI X Alnus n�bra Alder,Red 50 FAC %Species that are OBL,FACVN,or FAC(except FAF): 66 Cowardin Classification: Remarks no sign of portd'mg Hyd rologY Prirnary WeBand Hydrology In�catws s�da,y Hyd,or«�y ir►�rors [X]Recorded Data(describe in remarks) I ]Inundated [ ]O�ddized root channels I I Soream,i.aice,or Titie Gage I j�aturated in upper 12 inches [ j Wa6er-stained leaves [ j Aerial Photograph [ ]Water marks [ j Local so�l survey data i [ ]Other(describe in remarks) I ]Drift lines [ ]FAC-Neutrat test � Fieb Obser�atioru: I j Sediment deposits [ ]Ott►er(e�lain ire remarks) i flepth of Surface Water(in.): 0 [ ]Drainage paftems in wetlands � Depth to Free Water in Pd(i�.): >24 ' Depth to Saturated Soils(in.): >24 Remarks in swale appears fo drain welf $OI�S Depth Hor_ Matruc M�tle/2rx!Mottle Texture. (in.) Cobr Color anoe t Structure,etc. 0-8 A 10YR 32 8-16 A!8 10YR 4r3 10YR 5A6 few faiM lfydr�c Sor7s IndiCators [ I Histosol [ J Concretions [ ]Histic Epipedon [ j High Organic 9L in SurFace Layer ' _ [ }Sulfidic Odor [ ]Organic Sireaking [ ]Probable Aquatic Moist Regime [ ]listed on Zocal I-Iydric Soits List - [ ]Reducirx�Conditions [ j Listed on Nahional Hydric Soiis List . G ed or Lo�v-Chroma ColorS " ' � . � . � . . -. . . --E 1� ►eY - --- [ 1 Ott�er(e�lain in remarks) UnR Name: Taxonomy: . , - . . Drainage Class: [X]Field Observations matcfi map Remarks ditched swale Wetland Determination IXl��Y�Vegetation Ptesent [ ]This Data Parrt is a Wetland [ ]Hydric Soils Preserrt I I W��Hydrology Present Remarks wetland cx+teria PiOT met appears to drain well 4`� Pann 4 nf d Job Number. 02�54 Data Form c;�y_ � Routine Wetland Determination Wetland Data Point SP Z03 ProjectlSite_ L�berty Lakeridge Date: Jufy 07,2oos . AAP�icarrt/Owner: Lakridge Developrt�ent Count�r. King Investigator. M.4ieckert State: WA (X]Do nom�al circumstances e�dsi on the site? Community ia Mea�o�w I I Have vegetatan,sals,or hydrology been disturbed? Station ID: [ ]Is the area a poterdial problem area? Plot tD: Vegetation DominaM SDecies __ Common Name _ 76 Cover Indicator He�baceous X Phleum pratense Timothy 30 FACU X Jur►cus effusus Rush,SoR 40 FACW+ X Ser►ecio jacobaea Tartsy tagwott 20 UPL X Lotus car�iculafus Trefoil,Birds-Foot 30 FAC Pfantavomaior Plantain,Common _ 10_____ FAC�____ %Species that are 08L,FACW,or FAC(exoept FAF): 50 Cowardin Classification: Remarics HydroiogY P►;,,�y we�a.�d Hy�a«�y rr�rors s�aa.y x�a«�y��a�ro,s [Xj Recorded aat�,(�esaiGe u�re��ark�) I i Inundated [ )Oxid"¢ed rooi channels [ j Stream, Lake,or Tide Gage [ ]Saturated in upper 12 inches [ j Water�tained leaves ( ]Aerial Photograph [ �Water marks [ )Local soil survey data [ ]Other(describe in re.marics) [ J Drift Gnes . [ J FAGNeutrat test Fiefd Observatiorts ( l��ment deposits [ ]O[her(e�tain in remarks) Depth of Surfaoe Water(in.): 0 I ]Drainage pattems in wetlands Depth io Free Water in P�(in_): >24 Depth to Saturated Soils(in.): >24 F2emartcs � $O1�S Depth Hor. Matruc Mottie/2nd Mottle Texture, �-Z__!Cola __ ndance Contrast Stradure.etc. -- 0-8 A 10YR 3J2 Sandy Loam stones 8-16 8 10YR M3 Sandy Loam stones fiyciric Soi/s/ndic�ators [ 1 Histosol [ J Concretions - [ j Histic Epipedon [ J High Organic.%in 5urface Layer [ ]Sutfidic Odor [ ]Organic SUeaking [ ]Prob3ble Aqaatx RRoist Regime [ ]Listed on Local Hydric Soiis List [..]Reducing Conditions. .. � � [-jtisted on 1Vational Hydric So�Lisf � . -. .. . . - [ ]Gleyed or Low-Chroma Cobrs I ]Other(e�lain in rernarks) � � �- -�- . Unif Name: Taxonomy: � � Drainage Class: [X]Field Observations match map Remarks appears to drain we� Wetiand Determination [ ]Hydrophytic Vegetation Present [ j This Data Point is a Wettand f l�ric Soils Present [ )Wetland Hydrobgy Present Remarks weUand criteria NOT met appears to drain well 45 Paqe 2 of 4 � Job Number. 02�54 Data Form c�c�r Routine Wetland Determination Wetland Data Point SP 204 Project/Site: Liberty Lakeridge Date: July 07,2003 Applicant/Owner Lakridge Development County: King ' Invesfigator. M.Heck�t 5tate: WA . [Xl Do normal cireumstances e�ost on tfie site? -- Comrnunity IQ Meado�w [ ]Have vegetation,soils,or hydrology been d+sturbed? Station ID { ]is the area a patential problem area? Plot ID: Vegetation Dominarrt S e�ies ----- -- Common Name _ 9G Cover tncfcator Herbaceous X Agropyron iepens Quadcgrass 20 FACU X Agiasds Tenuis SibU�. Berttgrass,Cobnial 20 FAC X Lotus comiculafus Trefal,Birds-Foot 60 FAC X Alopea�usgeniculatus Fo�dail,Meadow 30 FACW+ Sh�b X Rubuslaaniatus BlackberyCut_Leaf 30 ____ FACIJ+____ %Species that are OBL,FACW,or FAC(except FAG): 60 Cowardin Classification: � Remarks HydrologY P•;►r►a,y weaa.►d t+yd.aoyy t,�r�►s saoor,��y Hyda�royy�.,d�to� I l Recorded IIata(�be in remarics) [ 1 inundated [ ]O�dd'¢ed root cFtanneRs [ ]Stream,Lake,or Tide Gage [ )Saturated in upper 12 ind►es [ ]Water-stained leaves [ J Aeriat Photograph [ ]Water marks [ ]Loca)soil survey data [ ]Other(describe in remarks) [ j Drift lines [ ]FAGNeutral test Fietd Observations I 1�i�M�� I )Other(e�tain in remarksj Depth of Surface Wate�(in.)_ 0 [ ]Drainage paltems in wetlar�ds Depth to Free Water in Pit(in.): >24 Depth to Saturated Sals(in_): >24 � Remarks $OI�S ' Depth Hor. Matrix Mottle/2nd Ntottle Textuce, in_ Cobr _ _. Abundance Contrast Strudure,etc. U-12 A 10Y}2 32 none Sandy Loam stones — 12-1$ A/B '!OYR 4r3 10YR 5/6 few faint Sandy Loam stones Nydric Soi/s lndicatws - [ ]Histosol [ ]Concxetions [ j Histic Epipedon ( ]High Organic%in Surface Layer [ ]Sutfidic Odor [ ]Organic Streak�g - [ ]Probable Aqua6c►uloist Res.�.. .. .. I I�istea on_locat tiydric soils llst. . • • . - - . . .. • •[ �j'tteducing Co[iditions �. . - [ ]Listed on Nationa!Hydric So�List . _ . . � [ j Gleyed or Low-Chroma Cobrs [ j Other(e�lain in remarks) Unit Name: Taxorwmy: Drainage Class: [XI Field Observations matc,fi map Remarks sandy gravelty loam Wetland Determination [Xj Fiydrophytic Vegetation Present [ j This Data PaM is a Wetland f I��Soils Present I J Wetland Nydrology Present _- Rema�lcs Wet�nd criteria NOT met appears to drain wel! � ^--- , _r. --J'�_ � �'� 1--� '; � .. ' i /� � ' 95' �' tr+. i� o �. / m j � � �m , �00' � 4 � � � o f � � / �+ i �T+ � ti m 'r � %c3� c3� � f � � � �' I �I � o R.� ,% �. �. ..- �� c�',,, ctiy "I t � � U' ` _ _ _ ,� : , � � ; c� *, o � �' � -�� w m � ,�" � ,�-�, o C�D f ,. ',� ~p � �ax�n�� / �� (� ' ; r�, 116' �` c',�. �� ,.�.. s� � 7 { � � ,�. ._..1'D3'. � � ! � n , � 100 � �� m q� :C'z�"C' O n , � � /� I � l�� ...._ ..-.C/•� � v�.AY f , � � � �, f ,� � , � � . r1 r� V L I �� ` rq � � � � � �"'�,,. Oo � ' �' � 2 Q� �� ,� � � . _ y � , .";f i 1} �'~ � f`S r�l� ''r !� � �� J t � �,� � 26' f, ,,•'��6' ° � ,, '� / �" �'+ rvi � � ��' � ,� ND PLA � � S . �PR � � ,. 0 � �� / � , 2�5� � �•,' � r'' / _ � ;, t tb�' -�------ ;.��----_ (�.._." � r'`-�-- �454' � . 1 � � �, � � l m�° ��'� � � �54' S6' S6' p 56' 1 56' � � n�i ��r'� � �y � I N � 1 �O � r� ._.. 1 1 � � p � r� - r� ,.,A,.� �� r � ` f 1 f � . "� , .r � m� '-� O `� O �� '-' � '_' 10 �I "a% o � � �3'" �� 2 .� �� ...� �`� " �? ',, (.Jl O -�'� �Q � � Q �fU � /' � ' ��/� .c�. � � t � �� tf ,�r . �� ►--5/�'N J�v R° � ...., ...... .,� ... .... _... � J �' � � / � ��' ` � =�'�� o � i 1 � , / ,� 0' �' S6' 56' �� 56' �l6' � � 56'� a ( � � TAqC M IEAD IN ''! I+ {pr 6 2 8 i � � \ � �.'.! �YR�AI��Mp IiOtT AT,,�D6� � � � ' � � «n - . .�. ��.r�-�-- �.�� E " ..� � ...� J .r^ �� ,r''' I' r � ,..,,rY's �'.y `� -�rw- +�-'r•-�-�.. . �.w.�� ...,�� \^� + �yr� 1�.� '� (E X I T I N G�,� ... � _.�,,...� ....�.._.....�...._,�..,� � �. _ _..., .�._.._..__._.....��....._._.._._.�. +��... �� v^ '" fa \ \ �� / '�.'wy""'.'"\,,`"""' h I r f .,r f� f � t � Wf � t � . r I �' � f �f� � � �� 'i �� -� � ; � -� �. � � ir � � I , V1 � F�i /7 O � � � � � . U W � � � O � J�n. ��. ^00�� ':I :lha�,� L.A�,_�rIDG_ D�V INC �o.=�F?9 P i � � � King County Water and Land ResourCW Pivision Departrnerrt of Natural Resources and Parks King SUe2t Center 201 South)adcson SUec4 Suite 600 Seattle,WA 9810a-3855 2D6-296-6519 206-296-0192 Fax June 28,2004 �_ � Wayne 7ones,Jr. Lakeridge Aevelopment,Inc. Post Office Box 146 Renton,VJA 980�7 R�: Transfer of Development Ri #s(T'DR)Certificate#76,DDES Sending Site File#A99P3116 Dear Mr.7ones: Enciosed is a confozmed copy(#20040623001597}of your Transfer of Development Rights (TDR)Certificate#76,dated 7une 22,2004. This Cerli£tcate is official documentation that Lakeridge Developmemt Inc.owns niue vrban development rights acquired from Ventis Capital, LLC. The ori�nal Cezcificate#76 will be mainrained in this Office. Please snbmit the entire fouz pages from Ceitificate#76 and the recozding cover sheet when and i,f addztzonal developmeut rights aze sold. I apologize for the delay in completing tbas Certificate transfer. In the future,submutting a purchase and sale agreemeut wi�t�i the Ceztificaze and a completed Real Estate Fxcise Tax Afftdavit will eicpedite the�ansfer process. Lf I may be of further service please contact me anytime at(206)296-1941 or via e-mail at n;sr3�soliitto(a�metrolr:�_gov. i hank you 2or your participation in the Transfer�f Developinent Rights Progtam. , Sincer � I � Mazk So o � _ TDR Pmgram?vlanager I MS:pr,9 I ; Enclosure '' cc: Faich Roland,Depar4meAxt of Nahual Resources and Parks ` Fereshteh Dehkordi,Deparlment of Developmeztt and�nvironmteata]Sezvices � �,�� ' `:J ;en. s. ^�C6 :; : '-iAM LAKE�iCGt DEV ;VC No•�639 P. 3 �� Recarding Raquested By And When Recorded Mail To:Mazk Sollitto z�i��co�ri CONF�A COPY Water and I.ands Reso►uces Dzvision Resource J ands and Open Sp3Ce Sectio �0i597 zo� sou�J�.�ofl S��S�t�bofl 20040fi23 M13 KSC-NR-0600 �nisc e.e0 Seattle,WA 98104 ��4e� KiNc wuHTv, ua RECOTtDING COVER SHEET TDR CERT��'ICATE #7b C'Jrantor:Ventis Capital LL.0 Grantee I.akeridge Developmen�Inc.. L,egal Descraption(abbreviated):Parcei#1-"�"RACT 1,BL.00K 3,CEDAR P_ARK FIVE ACRE TRACTS,VOLL:�LE 15,PAGE 91.Parcel r'�'2-I.OT 2,$I,OCK 3,CEDAR PARK FNE AC`i2E TIZl�CFS,Vt)TI,EJIvfE!5;PAGE 91.Parcel#3-LOT 7,BI.00K 1,AI�'D'I'HAT PORTION OF LOT 6,BLOCK 1,ALL IN JANETT'S RENTON BOLZEVARD TRACTS, VOLLJME 17 OF PT,ATS,PAGE 60. Additional legal(s)on: P8¢e One Assessor's Tax ParcellD#:.145750-0085-03.366450-0141-00_I45750-0090-06 � --— - — - , :;;A� �A�E�1DGt DEJ ;rC ao.°63�� P. 4 1an• s• �OGS ? � ' Recording Requested By And When Recorded Maii 70: Mark Sollitto � King County Transfer of Devetopment Rights Program Water and Land Resources Division 201 50.Jackson St.,Suite 600 MS: KSC-NR-0600 Seattle,WA 981p4 Transfer of Development Rights Ce�tificate Number: 76 9 Urban Deve[opment Rights Date Issued: June 22,2004 Certificate lssued To: Name: Lakeridqe Development Inc. Address: P.O. Box 146 City&Zip: Renton,WA 98057 This development right(s)is/are transferred from the folfowing certified sending site, pursuant to K.C.C.21A.37: Sending site file number: A99P3116 Grantor.King County,a political subdivision of the State of Washington Parcel Number,052205-9225 ' This certifies that Lakeridqe Develooment Inc. owns nine urban davelopment rights removed fram the sending site identified above,which has been qualified as a transfer of development rights sending site pursuant to K.C.C.21A.37, Receiving site: Parcei #1-Recordinq#199901132522 TRACT 1,BLOCK 3,CEDA.R PARK FIVE ACRE TRACFS,ACCORDING TO"I'HE PLA.T THEREOF,RECORllED L�1 VOLi,'ME 15�P PLATS,PAGE 91,IIv K�iG COL'I�'TY, WASHINGTON.EXCFPT'�HE?�TORTH 100 FEET OF'fHE WEST 270 FEET A.�ID BXCEPT THE SOUTH 29 FEET OF THE NOR'I'HERLY 129 FBBT OF EASTERLY 70 FEET OF TAE WEST 270 FEET AS PER KL�TG COiJti'TY ENGINEER SC.TBDMSION NO.6845, -RECORDED U?�TDF.?,R RECORDIIr G Na.94I0250673. Parcel #2-Recording#199402090504 LOT 2,BLOCK 3,GEDAR P.ARK F'IVB ACRE TRACTS,ACCORDING TO PLAT RECORDED IN vOLL'ME 15 OF PLATS,PAGE 91,IN KING COUNTY,WASHINGTON. Parcel#3-Recording#20031119U01446 ALL OF LOT 7,BLOCK 1,AND THAT PORTION OF I,OT 6,BLOCK 1,LYI�v'G SOUT��RLY OF A LTNE�EGLti'�11NG ON TI-�EAST L3NE OF SAID LOT 6 AT A POINT 123 FEET TORTH OF THL SOL"�HWEST CORIv�P,R THEREOF AND RUNNING 'WESTERLY TO A POINT ON T'I�WEST LL'�TE OF SAID LOT 6 AT A POINT 4.8 F�ET I�'ORTH OF THE SOU'I'HWEST COR'�1ER THP.REOF AND'IT� TERMINUS OF SAID L1N�AS SAID LII�'E WAS ESTABLISHED BY NDGEMENT ENTERED JA.rIi7ARY 29,1969�i KATG COiJNTY SUPERIOR COURT CAUSE NUMBIIt 691199,ALL IN JANETT'S RE�ITO?v BOITLEVARD TRACTS,ACCORDII�iG TO TF� PLAT THEREOF RE.CORDED IN VOLiJME 17 OF PLATS,PAGE 60 IN KII�G COUNTY, WASHINGTON,ASSESSOR'S TAX PARCEL N(31�IBER(S)366450-0141-00. Cerrificacc Number 7ti Page 1 of 4 Date Issued 6'22/04 O lae� � _il,`� � _'��1 L��_t;,:c�E D�`,� ,��;� �vo•:'639 P• 5 7he o�cial record of these development rights is maintained by King County. if there is any discrepancy between the number of rights ident�ed on fhis certificate and the official record,the officia!record shall control. lf any o#the development rights identified on this certifcate are sold,conveyed or transferred,the person acquiring the rights shall within ten (10)business days deliver to the King County Transfer of Development Rights Program this original cerEificate. A new certificate in the buye�s name shall then be issued. 7he development rights may be used onfy on a receiving site(s)that haslfiave been given final approval for additional residential density achieved through the transfer of development righis in accordance with King County Zoning Code(K.C.C.21A.37). � Approved by Representative of the King County Transfer of Development Rights Program Enteragency Revievv�Committee � . � � Signature D te STATE QF WA5HINGTON) )SS. COUNTY OF KWG ) l certify that I know or have satisfactory evidence that lI/� �;c.S�c.c--1�7o is the person who appeared before me, and said person acknowledged that he signed this instrument,on oath stated that he is autttor'tzed to exeCute the instniment and acknowledged it as the Program Manager,Transferable bevelopment Rights Program of King County to be the free and voluntary act of such party for the uses and purpases mentioned in the instrument. Dated: �0 27i�`� / ```p�UHO E 6��ii .�`��t�'oH �%.%',. ho#ary Pubiic in and for in� ;=?� �"�9 ': State of Washington � �oTapr _ _ --`-- ~ Residing at 1�'7Jt� �Ns•, p�91�t' b ` :�1.� �'yE o°,tCs: My appointment expires �O 3� 0/v ��''.�o�'w►a�`�,�`��• To Redeem Development Rights: In applying for receiving site approval,the applicant shall provide the Department of Development and Environmental Services with either a copy of this certificate issued in the name of the applicant or a copy of this certiflcate with a signed option to purchase these development right(s). For receiving sites within incorporated municipat jurisdictions,the applicant shaH provide the above documentation to the municipal jurisdictlon and shall follow that jurisdiction's development appliCation rev►ew process. Before building permit issuance or before final plat or short plat recording,the applicant shall deliver the appropriate TDR cefificates issued in the applicanYs name to the. Transfer of Development Righfs Program. The appficant shall receive an extinguishment document showing that the development rights have been applied to an approved receiving site. The TDR Program shall coc�firm for DDES or the municipal jurisdiction that the requirements of K.C.C.21A.37 have been met. Cerrifi�te 2�umbcr 16 Page 2 of 4 Date Issued 6!22/04 /,� � Jan � �� i)05 �� _�F'4� LAF:EP, iGuE �E'� IV�� do � ^��48 � � � � , , : P I N aF DEVELO N � AND i2EDEMPT O ME T ALE CONYEYANCE TRANS E 3 , R, . . � - : ; RIGHTS ' ; lf a1iy.,:uf the devebpme�t nghts identified on this certficate are sold,conveyed, �' ti'stt9ler ` andlor redeemed for use,the rson ac uirin and/or redeemi the ri hts . r�,d pe 4 9 � 9 -� s�talC�nnthin ten. 10 business da del�ver to tl�e Kin Courrry Trar�sfer of Deveb ment . . ( ) Ys 9 P _ .�t�gf�ts P��ra�i th�s ot�g�nai certficate with th�s sechon properly compfeted. �'�,. �� : . . . .._„ ' U,pon:receipt,.cerEi#�cat�(s}w�l be.�g-issued to nsflect the new number af nghts ., availebie;if thei'e are an�io the owrjer orlo the petson acqwnng the nghts after the : . � 5aE4 transfer=i�onve' nce$ful/or r�iem tion re orted hereln � , t. Ye . P P r . . `� ��t4.. A�. L-jll dat'thl.�sect{a�°•for a s�1l�,,:�Onvgy�nCe or transter of development righfs. - . � 1. GRANTE�(Buygr)' "��^r w ; ' Y . NAME ADDR�SS `� � ', CI7Y/STA7E ZIP CODE � ,� : 2.GRANTtiF�.(Seiler) ' . , :., NAME�:- � ,. , �,._ ADDRES��:• �. - - � ; C' CI� . .:. STAT�IZIP ,._„ ....�..._..._ 3.<NUM�i�O��DEVELOP�A�N7 RIGNTS SQLD,TR�►tJSFERftEd�:..;' nR:rQN�EYED .:� - ?JR�H�sS�PP.lC� +l. RECEMNG=.SIT��STR��7 AbDRE35 5.REC�IVING SIT�ZONING :� � '.I�� ..4. _ B.DDES RECEIVING SiTE PFt��APPLICA'FIOi�IPF.WIAIT FILE # ;" � .�...?'' ' 7. UEVELOPMENT RIGHT SELLEEZ APPROVAL . Signeture af Setler Date • , � 8. DEVELOPMENT RIGHT Bi1Y�R APPROVAL . ,: S�gnature of Buyer Date , . '. ` ' ti; 9. ATTACH WRtT'fEN EVfDENCE pF TRAAlSACTION „ =� `k: �;� {e g.Contract of Sale,8i{i of Sala) " _' Cert�f'icate Number 76 Page 3�Qf4:� � K� Dste Issexd b/22l04 ;y � r n ��F � ii�M LnN�.C'.�'.,_ .�� .�� 0•CbS�J • � Ij . Fill out this section for a redemption of development rights for use at a recetving site. 1. OWN�R(Person FZedeeming Rights) NAME � ADDRESS CITY STATE/ZIP WA 2. RECENING SITE fiOR WHlCH DEVELOPMEN7 RIGHTS ARE REDEEMED: TAX PARCEL NUMBER(S) 3_ KING COUNTY DEPARTMENT OF DEVELOPMENT AND ENVIRONMEN7AL SERVICES RECIEVING SITE DEVELOPMENT APPI.ICA710N FILE NUMBER � 4. KlNG COl1NTY DEPAR7MENT OF DEVELOPMENT AND ENVIRONMEN7Al SERViCES RECE{VING SiTE DEVELOPMEr�? APPLICA7ION APi'ROVAL DATE � 5_ NtIMBER OF RIGHTS t2EDEEMED 6. DEVEIOPMENT RIGH7 REDEEMER APPROVAL Signature of Redeemer Date �-;-,.•. - � n��.` _ .��'� :,.�.°` �� - -��:_ � • .. �,�� , .' - . . • C�cate Number 76 Page 4 of 4 Date Issued 6/22104 • � � � SECTION VIII T.E.S.C. ANALYSIS AND DESIGN T.E.S.C. DESIGN The T.E.S.C. plan has been prepared per the guidelines within Appendix D of the 1998 King Connty Surface Water Design Manual. The proposed detention/stormwater wetland facility will be used as a temporary sedimentation pond Silt fencing,catch basin protection,construction endrances and temporary interceptor trenches will be provided for additional control. The proposed detention facility within Liberty Grove Contiguous will be used as a temporary sediment pond. A ternporary sediment pond will also be provided for Liberty Grove. The calculations are in the following pages. � �I i � � I , � ' SEDI�AENT P�ND DES�GN- �i�ERTy 6 RavE ConiTl GcJouS SURFACE AREA SA=FS(Qz/Vs) where: Q, = Design inflvw based on the peak discharge from the developecf 2-yr runaff event frorR the contributing drainage area(See � 5ection 4). = 2_46 cfs VS = The settling velocity of the soil parbcte of interest. = 0.00096 ft/sec FS= Safety factor oi 2 to axouM for non-ideat set#fing. therefore SA= 2 x 2.46 l0.00096 = 5'125.0 s.f. SA Prwided = 25,224 s.f:( Area rt►easixed using Soft+desk Design Module) > 5125_0 s.f. therefore ok PRIMCIPAL SPILLWAY Q,o = D�evefOped 10-yr peak flow = 287 cfs D=Q�,,, /(9.739x H'a) = 0.29 ft where: D=diameter in feet �= f Qaer-�/(.3.782 x fi'rz)) 0.5= 0.87 R I-i= 1 Qv�uc��awc�c� =Qao �.. therefore use Q= 12 in diameYer risef fMERGENCY OYERFIOW SPlLLWAY �lwo= Deveioped 1 E)U-yr peak flow = 4.46 cis L=(Q,�!I(3.218'H'rz))-E 24 H)} = 15.05 ft where: t=ler�gth of splhaar H= 0.2 Feet �erefore use L= i6 ft DEWATERlNG ORIHCE Ao= fk(2 h�5 �rhere : ,qo=orifice area(s.f.) 0.6 x 3600 7g°S q.=pond surface area(s.f.y 25224 SF h= head nf w�er abave orifice(ft) = 5.5 ft = 0.284 s.f. g= acceleration of gravity(322 ft/sec�) T=dewatering time(24 hours) D= 43.54 x(A,)09° where : D = orifice diameter(in) = 7.72 in therefore use D= 7 1!4 in diameter orifice O , SEDIMENT PaND DESIGN - LIBERTY GROVE SURFACE AREA SA=�S�Q,/VS} ��: QZ = �n inflow based on the peak discharge from the devefoped 2-Yr runoff everrt from the contributing drairrage are�a(See Sectiort 4). = 1.33 cfs VS = The settl�rg velocRy of the soil partide of irrterest. = Q.00Q96 fUseC FS= Safety factor of 2 to accourrt for non-ideal settling_ therefore SA= 2 x 1.33/0.00096 = 2779.2 s.f. SA Provided = 2800 s.f.( Area measured using Softdesk Design Modale) > 2779.2 s.f. therefore ok PRINCIPAL SPILLWAY Q,o = Developed 10-yr peak flow = 1.64 ds D= (�,,,�,,, !(9.739 x t-i"�) = 0.17 ft where: D=diameter in fee# D= (Q«,��cE/(3.782 x H,a)) °5= 0.66 ft H= 1 ! Q,M�c afld Qa�c� =fl,o I therefore use D= 12 in diameter riser �I E�4ERGENCY 01lERFLOYY SP14.WAlf Q,�= Devefoped t04-yr peak(1ow = 2.639 cis L= (Q,�/((32'!8'H"�)}-(2.4 H)) = 8.71 ft where: L=length of spithvay H= 0.2 Feef iherefwe use L= 9 ft DElNATERING ORIFICE Ao= At(2 h p5 where : Ao= orifice area(s�f.) 0.6 x 3600 Tg� A�= pond surface area(s.f.) 2779.2 SF h= head ot water above o�ce(ft) = 2 ft = 0.019 s.f. g= accelerabon of gra+rity(32.2 ftlsecZ) t= dewatering time(24 hou�s) D= 13_54 x(A,}°5° where : D = orifice diameter(in) _ 'I.86 in therefore use D= 1 7/8 in diameter onfice `.J � " SECTION IX BOND QUANTITIES, FACILITY SUM S, AND DECLARATION OF COVENANT Site Improvement Bond Quantity Worksheet O King County Department of Development 8�Envfronmental Services 900 Oakesdale Avenue Southwest Renton,Washington 98055-1219 206-296-6600 TTY 206-296-7217 Alternative Formats Available Upon Request Pro)ect Name: LIBERTY GROVE Date: 4-May-05 l.ocation: NW & SE OF INT. OF SE 136TH ST. AND 160TH AVE. SE Project No.: L03P0005 8� L03P005 Act�vity No.: L04SR055 Note: All prices include labor, equipment, materials, overhead and Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seattle area or from local sources if not included in the RS Means database. yes � no If yes, Forest Practice Permit Number: ' (RCW 76.09) Pege 1 of 8 ' Unit prices updated: 02/12/02 Version: 04/22/02 KingCountyBondquantities.xls Check out the ODES Web s/te at www.metrokc.gov/ddes Report Date: 5/4/2005 - - i ■ 1 Site Improvement Bond Quantity Worksheet Unit #ot Reference# Price Unit Quantl A ifcations Cost ER SI N/S I T CONTR Number Backfill&com action-embankment ESC•1 $ 5.62 CY 36 1 202 Check dams,4"minus rock ESC-2 SWDM 5.4.6.3 $ 67.51 Each 15 1 1013 Crushed surfacin 1 1/4"minus ESC-3 WSDOI"9-03.9 3 $ 85,45 CY Ditchin ESC� $ 8.08 CY 560 1 4525 Excavation-bulk E3C-5 $ 1.50 CY Fence, silt E3C-6 SWDM 5,4.3.1 $ 1.38 LF 1840 1 2539 Fence,Tem ora NGPE E3C-7 $ 1.38 LF 480 1 662 H droseedin ESC-8 SWDM 5.4.2.4 $ 0.59 SY 22000 1 12980 Jute Mesh ESC-9 SWDM 5.4.2.2 $ 1.45 SY Mulch, b hand, straw,3"dee E3C-10 SWDM 5.4.2.1 $ 2.01 SY Mulch, b machine, straw, 2"dee ESC-11 SWDM 5.4.2.1 $ 0.53 SY Pi in ,tem ora , CPP,6" ESC-12 $ 10.70 LF I Pf in ,tem ora , CPP,8" ESC-13 $ 18.10 LF PI In ,tem ora , CPP, 12" ESC-14 $ 20.70 LF 70 1 1449 Plastic coverin ,6mm thick, sandba ed E3C-15 SWDM 5.4.2.3 $ 2.30 SY Ri Ra , machine laced; slo es ESC-76 WSDOT 9-13.1 2 $ 39.08 CY Rock Construction Entrance, 50'x15'x1' E3C-17 SWDM 5.4.4.1 $ 1,464.34 Each Rock Construction Entrance, 100'x15'x1' E3C-18 SWDM 5,4.4.1 $ 2,928.68 Eech 2 1 5857 Sediment ond riser assembl ESC-19 SWDM 5,4.5.2 $ 1,949.38 Each 2 1 3899 Sediment tra , 5' hi h berm ESC-20 SWDM 5,4.5.1 $ 17.91 LF Sed.tra ,5'hI h,rl ra ed a illwe berm aectlon ESC-21 SWDM 5.4.5.1 $ 88.54 LF Seedin , b hand E3G22 SWDM 5.4.2.4 $ 0.51 SY I Soddln , 1"dee , level round ESC-23 SWDM 5.4.2,5 $ 6.03 SY Soddin , 1"dee , slo ed round E3C-24 SWDM 5.4.2.5 $ 7.45 SY TESC Su ervisor ESC-26 $ 74.75 HR 8 1 598 Water truck, dust control ESC-26 SWDM 5.4.7 $ 97.75 HR 32 1 3128 WRITE- N-I S **"* se e 9 Each , ESC SUBTOTAL: $ 36,852.49 � 30%CONTINGENCY&MOBILIZATION: $ 11,055.75 E3C TOTAL: $ 47,908.24 COLUMN: A Page 2 of 9 Unit prlces updated; 02/12/02 Version: 04/22/02 KingCountyBondquantitfes.xls Check out the DDES Web s/te at www.metrokc.srov/ddes Report Date: 5/4/2005 Site Improvement aona Quantity v�orKsneC� Existing Future Public Private Qu�ntity ComplatM Rlght-of-Way Roed Improwmanb Improvement� (Bond Raductlon)" d�Dralna a Facllitlas Quant. Unit Price Unit Quant. Cost Quant Cost Quant. Coat Com lete Coat ERA IT Backfill 8 Com action-embankment GI-1 $ 5,62 CY 14 7B.68 Backfill 8 Com action-trench GI-2 $ 8.83 CY Clear/Remove Brush b hand GI-3 $ 0.36 SY Clearfn /Grubbin /Tree Removel GI-4 $ 8 876.16 Acre 0.7 6,213,31 2 17,752.32 10.8 95,862.53 Excevatlon-bulk GI-B $ 1.50 CY 200 300.00 1000 1,500.00 4000 6,000.00 Excavatlon-Trench GI-8 $ 4.06 CY Fencin ,cedar,6'hl h GI-7 $ 18.55 LF Fencin ,chain Iink,vin I coated, 6'hl h GI-8 $ 13.44 LF 290 3,897.60 Fencin ,chain link, ete,vin I coated, 2 GI-9 $ 1,271.81 Each Fencin ,a lit rafl,3'hi h GI-10 $ 12.12 LF Ffll&com act-common barrow GI-11 $ 22.57 CY FIII 8 com act- ravel base GI-12 $ 25.48 CY Fill 8 com ect-screaned to soil GI-13 $ 37.85 CY Geblon, 12"dee ,atone fllled mesh GI-14 $ 54.31 SY Gabion, 16"dee ,stone filled meah GI-15 $ 74.85 SY Gabion,36"dee ,stone filled mesh GI-16 $ 132.48 SY Gradin ,fine,b hand GI-17 $ 2.02 SY Gredin fine,with rader GI-18 $ 0.95 SY 8800 6,460.00 9700 9,215.00 52200 49,590.00 Monuments,3'lon GI-19 $ 135.13 Each 3 405.39 8 1,081.04 Sensitive Arees Si n GI-20 $ 2.88 Each 9 25.92 Soddin 1"dea alo ed round GI-21 $ 7.46 SY Surve in ,I(ne 8� rade GI-22 $ 788.28 Da 2 1,576.52 2 1,576.52 1 788.26 Surve in ,lot location/Iines GI-23 $ 1,556.64 Acre 12.8 19,924.99 I Traffic control crew 2 fla ers GI-24 $ 85.18 HR 32 2,725.76 Trall,4"chi ed wood GI-25 $ 7.59 SY Trail,4"crushed cinder GI-28 $ 8.33 SY Trail 4"to course GI-27 $ 6.19 SY 100 819.00 Wall,retainin ,concrete GI-28 $ 44.16 SF 1700 75 072.00 Wall,rocke GI-29 $ 9.49 SF 15 142.35 15 142.35 Pege 3 of 9 SUBTOTAL 17,823.33 111,160.43 172,165.78 Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. VersfOn: 4/22/02 KingCountyBondquantitfes.xls Check out the DDES Web slte at wrvw.metrokc.t�ov/ddes Report Date: 5/4/2005 Site Improvement t3ona Quantity v�orKsneC� Existing Futun Public Privata Bond Reductlon• Rlpht-of•way Road Improvamonb Improvemanb 6 Droln� o Facilltlas Quant. Unit Price Unit Quant. Cost Quent. Cost Quent. Cost Com lete Cost O OV AC Grindin ,4'wide machine<1000s RI-1 $ 23.00 SY AC Grindin ,4'wide machine 1000-200 RI-2 $ 5.75 SY AC Grindin ,4'wide machlne>2000s RI-3 $ 1.39 SY 3430 4,733.40 AC Removel/Dls osal/Re air RI-4 $ 41.14 SY Barricade,t a I RI-5 $ 30.03 LF Barricade, e III Permanent RI-6 $ 45.05 LF Curb 8 Gutter,rolled RI-7 $ 13,27 LF 3020 40,075.40 500 6,635.00 I Curb&Gutter vertical RI-8 $ 9.69 LF 1960 18,992.40 � Curb and Gutter,demolition and dis osa RI-9 $ 13.58 LF Curb,extruded es halt RI-10 $ 2.44 LF Curb,axtrudad concrete RI-11 $ 2.58 LF Sawcut as halt,3"de th RI-12 $ 1.85 LF 1200 2,220.00 Sawcut,concrete, er 1"de th RI-13 $ 1,69 LF Sealant as halt RI-14 $ 0.99 LF 1200 1,188.00 Shoulder,AC, see AC road unit rice RI-15 $ - SY Shoulder, ravel,4"thick RI-16 $ 7.53 SY Sidewalk,4"thick RI-17 $ 30.52 SY 555 16 938,60 Sidewalk,4"thick,demolition and dis os RI-18 $ 27.73 SY Sidewalk,5"thick RI-19 $ 34.94 SY 733 25,611.02 Sidewalk 5"thick,damolition and dfa oa RI-20 $ 34.85 SY SI n handfce RI-21 $ 85.28 Eech Strl in , er stall RI-22 $ 5.82 Each Stri in thermo lastic, for crosawalk RI-23 $ 2.38 SF Stripin ,4"reflectorized Ilne RI-24 $ 0.25 LF 1200 300.00 Page 4 of 9 SUBTOTAL 44,372.40 65,686.42 6,635.00 Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. Version: 4/22/02 KingCountyBondquantities,xis Check out the DDES Web s/te et www.metrokC.t�Ov/ddes Report Date: 5/4l2005 Site Improvement t3on Quantity v�orKsneC� �xlsting Future Public Prlvate Bond RaducGon" Rlaht-of-w�y Roed Improvamenb Improvemanb 8 Dralna a Facllitles Quant. UnK Price Unit Quarrt. Cost Quant. Cost Quent. Cost Com lete Coat FACt (4"Rock=2.5 base&1.5"top course) For'93 KCRS(6.5"Rock=5"bese 81.5"top course) For KCRS'93, additional 2.5"base add RS-1 $ 3.60 SY 3590 12,924.00 5720 20,592.00 AC Overla , 1.5"AC RS-2 $ 7.39 SY 3430 25,347.70 AC Overie ,2"AC RS-3 $ 8.75 SY AC Roed,2",4"rock,First 2500 SY RS-4 $ 17.24 SY 2500 43,100.00 400 8,896.00 AC Road,2",4"rock,Q ,over 2500SY RS-5 $ 13.36 SY 3220 43,019.20 AC Road,3" 4"rock,First 2500 SY RS-6 $ 19.69 SY 2500 49,225.00 AC Road,3",4"rock,Q ,over 2500 SY RS-7 $ 15.81 SY 1090 17,232.90 AC Road,5",First 2500 SY RS-8 $ 14.57 SY AC Road,5",Q .Over 2500 SY RS-9 $ 13.94 SY AC Road,6" Firat 2500 SY S-1 $ 16.76 SY AC Roed,6",Q .Over 2500 SY S-1 $ 16.12 SY As halt Treated Bese 4"thick S-1 $ 9.21 SY Grevel Roed,4"rock,First 2500 SY S-1 $ 11.41 SY Grevel Road,4"rock Q .over 2500 SY S-1 $ 7.53 SY PCC Road 5",no base,over 2500 SY S-1 $ 21.51 SY PCC Road, 6",no base,over 2500 SY S-1 $ 21.87 SY Thickened Ed e S-1 $ 8.89 LF 197 1,357.33 Page 5 of 9 SUBTOTAL 104,729.60 106,711.20 8,253,33 � Unit prices updated; 02/12/02 il 'KCC 27A authorizea only one bond reduction. Version: 4/22/02 KingCounryBondquantitles.xls Check out the DDES Web site at www.metrokc.�ov/ddes Report Date;5/4/2005 _ _ _ _ _ — I 5ite Improvement dona Quantity vJorKSr�ee� Existlnq Future Public Prlvat� Bond Reductlon• Right-of•way Roed Improvamenb Improvaments d�Dralna •Facllltles QuaM. Unit Prlce Unit Quant. Cost Quar�, Coat Quant. Cost Com lete Cost ( A E (CPP s Corrugated Plastic Pipe,N72 or Equfvelent} For Culvert ncea Avera e of 4'cover was assumed.Assume erforeted PVC is seme rlce as solld i e. Access Roed,R/D D-1 $ 16.74 SY 133 2,226.42 Bollards-fixed D-2 $ 240.74 Each 2 481.48 Bollarda-removeble D-3 $ 452.34 Each 2 904.68 " CBs Include frame and ifd CB T e I D-4 $ 1,257.64 Eech 23 28,925,72 18 22,637.52 6 7,545.84 CB T e IL D-5 $ 1,433.59 Each 1 1,433.59 CB T e II,48"diameter D-6 $ 2,033.57 Each 6 12,201.42 5 10,167.85 for additional de th over 4' D-7 $ 436.52 FT 22 9,603.44 34 14,841.68 CB T e II,54"diameter D-8 $ 2,192.54 Each for additional de th over 4' D-9 $ 486.53 FT CB T e II,60"diameter D-10 $ 2 351.52 Eech 1 2,351.52 for additional de th over 4' D-11 $ 536.54 FT 4.5 2,414.43 CB T e II,72"diameter D-12 $ 3,212.64 Each for addit(onal de th over 4' D-13 $ 692.21 FT Throu h-curb Inlet Framework Add D-14 $ 366.09 Eech Cleanout,PVC,4" D-15 $ 130.55 Eech Cleanout,PVC,6" D-16 $ 174.90 Each 30 5,247.00 Cleanout PVC,8" D-17 $ 224.19 Each 6 1,345.14 Culvert,PVC,4" D-18 $ 8.64 LF Culvert,PVC,6" D-19 $ 12.60 LF 1880 23,688.00 Culvert,PVC, B" D-20 $ 13.33 LF 508 6 771,64 Culvert PVC, 12" D-21 $ 21.77 LF 529 11,516.33 Culvert,CMP,8" D-22 $ 17.25 LF Culvert,CMP, 12" D-23 $ 26.45 LF 1875 49,593.75 139 3,676.55 Culvert PVC,15" D-24 $ 25.00 LF 827 20,675,00 418 10,450.00 Culvert,PVC,18" D-25 $ 29.00 LF 476 13 804.00 132 3,826.00 Culvert,PVC,24" D-26 $ 33.00 LF 207 6,831.00 Culvert,CMP,30" D-27 $ 71.45 LF Culvert,CMP,36" D-28 $ 112.11 LF Culvert,CMP 48" D-29 $ 140.83 LF Culvert,CMP,60" D-30 $ 235.45 LF Culvert,CMP,72" D-31 $ 302.58 LF Page 6 of 9 SUBTOTAI. _ 104,990.50 119,897.33 48,274.17 Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. Version: 4/22/02 KingCountyBondquantitiea.xls Check out the DDES Web slfe at www.metrokc.�ov/ddes Report Date: 5/4/2005 5ite Improvement aona Quantity vdorKsnec� Existing Futuro Public Prlvete Bond Reductlon" Right-of-way Road Improvements Improvomenta D IN C3 T N ED 8 Drainape Facllfties Quant. No. Unit Pnce Unit Quant. Cost Quant Cost Quant. Coat Com lete Coet Culvert Concrete,8" D-32 $ 21.02 LF Culvert,Concrete, 12" D-33 $ 30.05 LF 23 691.15 Culve�t,Concrete, 15" D-34 $ 37.34 LF Culvert,Concrete 18" D-35 $ 44,51 LF Culvert,Concrete 24" D-36 $ 61.07 LF Culvert,Concrate 30" D-37 $ 104.18 LF Culvarl,Concrete 36" D-38 $ 137.83 LF Culvert,Concrete 42" D-39 $ 158.42 LF Culvert,Concrete,48" D-40 $ 175.94 LF Cutvert,CPP,6" D-41 $ 10,70 LF Culvert,DI,8" D-42 $ 21.00 LF Culvert,DI, 12" D-43 $ 30.00 LF 232 6960 286 8580 140 4200 Culvert,DI, 15" D-44 $ 37.00 LF 384 14208 Culvert,DI, 18" D-45 $ 27.60 LF 26 717.6 Culvert,CPP,24" D-46 $ 36.80 LF j Culvert,CPP,30" D-47 $ 48.30 LF � Culvert,CPP,36" D-48 $ 55.20 LF Ditchin D-49 $ 8.08 CY 200 1616 Flow Dis ersel Trench 1,436 base+ D-50 $ 25.99 LF French Drain 3'de th D-51 $ 22.60 LF Geotextlle,laid in trench, ol ro lene D-52 $ 2.40 SY Inflltration ond testfn D-53 $ 74.75 HR Mid-tenk Access Riser,48"dla, 8'dee D-54 $ 1 605.40 Each Pond Over�ow S fllwa D-b5 $ 14.01 SY 5 70.05 Restrictor/Ofl Se arator, 12" D-58 $ 1,045.19 Each Restrictor/Ofl Se arator, 15" D-57 $ 1,095.56 Each Restrictor/Oil Se arator, 18" D-58 $ 1,146.16 Each 1 1146.16 RI ra , laced D-59 $ 39.08 CY 10 390,8 Tank End Reducer 36"diameter D-60 $ 1 000.50 Each Trash Rack, 12" D-61 $ 211.97 Each Trash Rack, 15" D-62 $ 237.27 Each 1 237.27 Trash Rack, 18" D-63 $ 268.89 Each 7 1862.23 Trash Rack,24" D-64 $ 340.00 Each 1 340 Page 7 of 9 SUBTOTAL 25934.65 10904.81 4200 Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. V9f8i0n: 4/22/02 KingCountyBondquantities.xls Check out the DDES Web s/te at www.metrokc.srov/ddes Report Date: 5/4/2005 Site Improvemen�ona Quantity vdorresnec� �xisting Futuro Public Private Bond Raductlon` RIgM-of•way Road Improvemants Improvom�nts 3 Drain� a Fecllltles Quant. Unit Price Unit Quant: Price Quant. Cost Quant. Cost Com lete Cost PA t T No. 2"AC,2"to course rock&4"borrow PL-1 $ 15.84 SY 2"AC, 1.5" to course&2.5"base cou PL-2 $ 17.24 SY 4"se�ect borrow PL-3 $ 4.55 SY 1.5"to course rock&2.5"bese courae PL-4 $ 11.41 SY Rir - - � CHANNELIZATION INT. 156TH&136T WI-1 $ 400.00 LS 1 400 5'WIDE PED.WALKWAY WI-2 $ 17.24 SY 170 2,930.80 STAIRS W/HANDRAIL WI-3 $10,000 LS 1 10,000.00 W I-4 EA. WI-5 EA. W I-6 EA. WI-7 LF WI-8 SF WI-9 LF wi-to LF SUBTOTAI_ 400.00 12,930.80 SUBTOTAL(3UM ALL PAGE8): 298,250.48 427,290.79 239,528.28 30%CONTINGENCY 8 MOBILIZATION: 89,475.14 128,187.24 71,858.48 (3RANDTOTAL: 387,725.63 555,478.03 311,388.78 COLUMN: B C D E Page 8 of 9 Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Version: 4/22/02 KingCounryBondquantities.xls CheCk ouf the DDES Web slte at www.metiokc.nov/ddes Report Date: 5/4/2005 Site Improvement Bond Quantity Worksheet Origlnal bond computations prepared by: Name: MEL L. DALEY, P.E. Date: 5/4/2005 PE Registration Number: 13258 Tel.#: (253) 333-2200 Firm Name: DALEY-MORROW-POBLE'fE, INC. Address: 726 AUBURN WAY N, AUBURN, WA 98002 Project No: L03P0005 & L03P005 ROAD IMPROVEMENTS&DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS PERFORMANCE BOND' PUBLIC ROAD&DRAINAGE AMOUNT BOND"AMOUNT MAINTENANCE/DEFECT BOND' REQUIRED AT RECORDING OR ' Stabilization/Erosion Sediment Control(ESC) (A) $ 47,908.2 TEMPORARY OCCUPANCY*•• Existing Right-of-Way Improvements (B) $ 387,725.6 Future Public Road Improvements&Drainage Facilities (C) $ 555,478.0 Private Improvements (D) $ 311,386.8 Calculated Quantity Completed (E) $ - Total Right-of Way and/or Site Restoration Bond`/'• (A+B) $ 435,633.9 (Flrst$7,500 of bond•shall be cash.) Performance Bond"Amount (A+B+C+D) = TOTAL (� $ 1,302,498.7 T x 0.30 $ 390,749.6 OR immum on amoun is . Reduced Performance Bond*Total"** (T-E) $ 1,302,498.7 Use larger o x o or - (g+C)x Maintenance/Defect Bond"Total 0.25= $ 235,800.9 NAME OF PERSON PREPARING BOND"REDUCTION: Date: "NOTE: The word"bond"as used in this document means any financial guarantee acceptable to King County. ""NOTE: KCC 27A authorizes right of way and site restoratlon bonds to be combined when both are required. The restoration requlrement shall include the total cost for all TESC as a minimum,not a maximum. In addition,corrective work,both on-and off-site needs to be inctuded. Quantities shall reflect worse case scenarios not just minimum requirements. For example,If a salmonid stream may be damaged,some estimated costs for restoration needs to be reflected in thls amount. The 30%contingency and mobilizatlon costs are computed in this quantity. """NOTE: Per KCC 27A,total bond amounts remaining after reduction shall not be less than 30%of the original amount(T)or as revised by maJor deslgn changes. SURETY BOND RIDER NOTE: If a bond rlder Is used,minimum additional performance bond shall be $ 866,864.8 (C+D)-E REQUIRED BOND"AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DDES Page 9 of 9 Unit prices updated: 02/12/02 Check out the DDES Web site at www.metrokc.s�ov/ddes Version: 4/22/02 KingCounryBondquantities.xls Report Date: 5/4/2005 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL �' STORMWATER FACILITY SI;fMMARY SHEET Development �� vE ��T/6�ioGcs Date !��Ay ZT��f �I , Locarion A/�,�/ 4� -S'F D�' /.VTE2�S'ECT/B�tl af SE f3�T� .S�i2.E� A�vt� /60 TN AUENUE .S'�'. ENGINEER DEVELOPER Name EC L GE . E. N� L KE D (/ECo Fum OfjL E -MOr2eDGt�- C-" it/G Firm a� - Address Address , Q, (jp�( 0 2 iv 980.s7 Phone 25 3 —Z 20 Phone L � 9 S'p Developed Site: Acres �Z. 7� Number of lots �00 N�ber of detention facilities on site: Number of infil�ration faciiiries on site: - � ponds ponds vauits vaults tanks tanks - Flow control provided in regional facility(give location) No flow control rcqvired Ezemption number Downstream Dcaina e Basins Immediate Ma"or Basin Basin A (j C671�! 2� G(J Basin B B asin C � Basin D Number&type of water quality faciliries on site: biofiltrarion swale(regular/wed or sand filter{baSic or large?) continuous inflow?) sand filter,linear(basic or luge?) _�combined detentionftiJQ pond sand fiiter vauii @asic or iarge2) (WQ portion batic or large?) combined detention/weivault stormwater wettand compost fiiter _L wetpond asi or large?) . filter strip wetvatilt flow dispersion farm management plan landscape management plan oiUwater separator(baflle or coalescing plate?) caich basin inserts:Manufaciurer pre-seulinD pond pre-settling structure:Manufacturer flow-spiitter catctibasin DESIGN INFORMATION � INDNIDUAL BASIN A " B C D Water Quali desi flow A Water Quali treated volume or we nd Vr 1998 Surface Waier Design Manaal 9/1/'98 1 _ � �l KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL DESIGN TOTAL INDNIDUAL BASIN " INFORMATION,cont'd D�ainage basin(s) A B C D Onsite area /2 � y c offsice area 3•�/S c T of Stora e Facili ETEJ�T/O�/ Live Stora e Vo2ume $ $ Predevelo Runoff Rate 2- ear , ia � i oo- � G .s Develo runoff rate 2- ear S � ia � 3 i oa � � T of resti-ictor G ' Size of onficehestriction No_ 1 �� No.2 g�a•• No. 3 / '� No.4 FLOW CONTRaL&WATER QUALTIY FACILITY SU1�IIv1ARY SHEEI'SKETCH Ali detention,infiltration and waier quality facilities must include a sketch per the following criteria: I. Heading for the drawings should be located at the top of the sketch(top right-hand corner)_ The heading should contain_ � • North arrow(point up or to leh) • D9# - . � • Plat name or short ptat number . •Address(nearest) , • Date drawn(or updated) •'Ibomas Brothers page,gid number � 2. Labet CBs and MHs with the plan and profile designation. Label che control structure in writing or abbreviate � with C_S. Indicate which structiues provide spill con�oL 3. Pipes—indicate: Pipe size Pipe length F-7ow direction Use s single heavyweight line 4_ Tanks—use a double,heavyweight line and indicate size(diameter) 5. Access roads • Ouflme the Iimits of the road • Fll the outIine with dots if the road is gravel. Laf�el in wriang if another surface. 6_ Other Standard Symbols: • Bollards:• •�• ■ ■ ■ ■ • Rip rap o00000 000000 Fences —x--x—x—x—x—x— • D1tChes —I}----�D----�D--;D " 7. Label trash racks in writing. 8. Label all streets with the actual street sign designation. If you don t know the actual street name,consult the plat map. . 9. Include easements and lot tines or tract limits when possible. 10_ Arrange all the labeling or wnting to read from left to rigt►t or from bottom to top with reference to a properly oriented heading. 11. Indicate driveways or features that may impact access,maintenance or replacement. 9/1J98 1998 Surface Wacer Desi�Manual 2 ��I,, LANDSCAPE BOND QUANTITY WORKSHEET FORM � KI�vG COUtvTY PROJECT NAME: L/,��/2jGJ G/Zov�/G/�E�� /Zov� �a�VTi� �ept_of Developme� nd Environme�ual Services DDES PROJECT#: G D v�PQ�S AND L 0,��.�� 900 Oakesdale Avemie Southwest / :enton,WA98055-1219 ADDRESS: � �s3S �(��TJ� A�� E 9� /36 yy /�� Tiy ��,�-� o6i296-660o PREPARED BY: /�LEX /�OBCETE" Pxo1vE: (2S3J333 -22� Ronds are based upon required landscaping only and will be posted for pesformance and/or maintenanc� Requued landscaping mcludes perimeter �ndscaping,surface parking azea landscaping,(KCC 21A.16)and any landscaping required by SEPA environinental review_ The maintenance period s for the life of the project,however,aftet posting for maintenance,the perfonnance bond will be reduced io 30%($I,000.00 minim�un)and be held for a two year period. Upon re-inspection of the site the bond will be released if the site has been properly maintained (21A.16_180)_ A landscape -naintenance inspection deposit of 5316.80 is required prior to permit issuance to cover the costs of tbe 2-year maintenance inspecfion_ _andscape inspections are billed at the current hourly rate once the initial deposit is exhausted.If the project has not been maincained and there are lead trees,shrubs,gound cover,or other deficiencies noted in the required landscaping,the bond will be held until the deficiencies aze cotrected_ ,_. . . .=. ... : �.- ' - _ u��r P�c� urt�r�� Q�Ari�-rr� �e� � SOD LAWN AREAS 5500.00 MSF(1000 SQ.F'I) HYDROSEEDING $50.00 MSF(1000 SQ.F1� SOII.PREPARATION A.TOPSOII.(6 INCHES DEEP) $2S_00 CY(CiJBIC YARD) B_MULCH(2 INCHES DEEP) $4_00 SY(SQUARE YARD) C_PEAT MOSS(TWO INCHES DEEP) $2.30 SY(SQUnRE YARD) D_COMPOST(3 fi�(CHES DE£P&7�iLLFNG 526.00 SY(SQUAR£YARD) E_FERTILIZER $6.67 CY(CUBIC YARD) PLANT MATER7AL.S A.DECIDUOUS TREES I.7S-2.00"CALIPER(mm�r►um height 10') $250.00 EACH COST&LABOR PERIMETER&PARKING AREAS � i.S- I.75"CAiII'ER �22�.QG EACfi CUST&LABG� 1G 4Z Z� S2 S R7IFWOR l.WDSCAP[NG OR OTffER REQUIR£D IaNDSCAPiNG G/ 7 B.EVERGREEN TREES � FIVE(5)FEE'i'OR ABOVE $150.00 EACH COST&LABOR C.SHRUBS $35_00 EACH COST&LABOR BOND AMOUNT SUB TOTAL: I SUB TOTAL BOND AMOUNT $ 2 �f, S ZS R�a i.sQw sr�v.zoo, PAGE 1 OF 2 �L LJIVIT PRICE I1NIT TYPE QUANTTI'Y PRICE D_GROUND COVER 54.00 EACH COST&LASOR MISCELLAI�IEOUS TREE STAKES 52.65 EACH iE�R SOTAKE& ^ /� �� ` G vj FENCING_ LINEAR FOOT SOLID WOOD CEDAR $28.5a INCLUDES LABOR � BERMING $17_50 LINEAR FOOT INCLUDES LABOR IRRIGATION 80¢ SQUARE FOOT RELOCA"[�(G TREES ON SIT'E 36"BALL �260.00 EACH 60"BALL 5920.00 EACH RELOCAT'II�IG SHRUBS ON SITE 12"BALL $26.00 EACH 24"BALL $33.00 EACH I� ADDITIONAL ITEMS I SUB TOTAL BOND AMOUNT BOND SUB TOTAL: s Z.�;ID3 �r Add 30% of the Bond Su�Total for Contingency in accordance with 30 % CONTINGENCY- Financial Guarantee Ordinance 120220,Section 13. - � s 7,53 / TOTAL BOND PRICE TOTAL BOND PRICE: � $ 32� �3�G . � ;�ri�a�aQw srz9rZooi /.� ti" SECTION X OPERATIUNS AND A�IAINTENANCE MANUAL - /t//iq