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Home My WebLink About03522 - Technical Information Report � � °�4.ce . 3+a e+?'�z��;.�'at�y,.lqr^_m- � ,t�.�!p► . �. .� . . .� �•. �. k: .�� ' \ Y (V ;� s. ;: �� x t� CONSULTANTS =`�� ' ��- , ��` � s� . - • . , f f _ �` �: =�, `- .� ,. . _,_.�__ . � � � � • � � � ' • ' � • • • • � ' • • • • `_.� � - � .1. ` � i � � +' .',.�:_.. g� 'Sf t.r cf�_i�- � .• . � �- - - . �� I !� � , i � ;� Prepared for: , , �t-�� , ____ . _ _ Rick Burnstead Construction Ca � � Mr. Greg Strong ��, , - , �,� , ' ,;,. ` _ 1 1980 NE 24t" St., Suite 200 �y.. ._ . .._ � � . -, � ::;s - Bel levue, WA 98005 ,�' . �� ti � - �-'. • . -_� Prepared by: . i� �. .: � � ) ` , .: . �. �`-� ' �. _�,�- CPH Consultants . . i ' � . , ' Mr. Jamie B. 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's��'vn ,:� r'�� ';+m.e... . .,.�� CP H CONSULTANTS TECHNICAL INFORMATION REPORT FOR DELANEY PARK SUBDIVISION TABLE OF CONTENTS SECTION 1 —PROJECT OVERVIEW.-----------•-•....................•-----------------------------------------------•-•---••---•----•••------------.1 FIGURE 1 —LOCATION�VICINITY MAP FIGURE 2—TIR WORKSHEET SECTION 2—CONDITIONS AND REQUIREMENTS SUMMARY_______________________________________________________________________________3 SECTION 2.1 —PRELIMINARY PLAT REPORT AND DECISION SECTION 3—OFF-SITE ANALYSIS.-------------------------------------------------••••-------••--------••----------------------------------------•-5 SECTION 3.1 —DRAINAGE COMPL41NT5 SECTION 3.2—SITE SOIL CONDITIONS SECTION 3.3—DOWNSTREAM ANALYSIS SECTION 4—FLOW CONTROL AND WATER QUALITY ANALY515 AND DESIGN 14 ---------------_...-------•--•-•------------------------- SECTION 4.1 —HYDROLOGIC ANALYSIS AND KCRTS MODEL RESULTS FIGURE 4—EXISTING SITE CONDITIONS FIGURE S—DEVELOPED SITE CONDITIONS FIGURE 6—DRAINAGE SUB-BASINS AND SITE CHARACTERISTICS SECTION 4.2 —FLOW CONTROL AND WATER QUALITY ANALYSIS AND DESIGN SECTION 5—CONVEYANCE SYSTEM ANALYSIS AND DESIGN 17 -------------•--••----•-----------------------------•--------------------------- SECTION 5.1 —CONVEYANCE AND BACKWATER ANALYSIS FIGURE 7—BASIN CONTRIBUTING AREAS $ECTION b—SPECIAL REPORTS AND STUDIES 1 S ------------------------------------------•----•--••••-•---------------------------------------- SECTION 6.1 — WETLAND AND WILDLIFE ASSESSMENT REPORT (RAEDEKE ASSOCIATES, INC.;IUCY 19, 2007) I SECTION 6.2— TRAFFIC IMPACT ANALYSIS (THE TRANSPO GROUP;DECEMBER 18, 2007� SECTION 6.3— WETLAND IMPACT ANALYSIS (RAEDEKE ASSOCIATES, INC.;MAY 13, 2009) SECTION 7—OTHER PERMITS 1 9 ------------------------------------------------------•-••-.._.....-•--------------------------------------------- SECTION 8—CSWPPP ANALYSIS AND DESIGN 20 ------------------------------------------------------------------------------------------- SECTION 8.1 —ESC FACILITIES DESIGN CALCULATIONS SECTION 9—BOND QUANTITIES, FACILITY SUMMARIES,AND DECLARATION OF COVENANT ________________________________23 SECTION 9.1 —BOND QUANTITY WORKSHEET AND DECLARATION OF COVENANT SECTION 9.2 —FACILITY SUMMARY SHEETS SECTION 1 O—OPERATIONS AND MAINTENANCE MANUAL 24 ------------------------------------------------•----------•----------•--- Site Planning (iril Engineering Project Management Land Development Consulting Delaney Pork Subdivision Technical Information Report SECTION 1 - PROJECT OVERVIEW This Technical Information Report (TIR) describes the storm water conditions and proposed drainage improvements for the Delaney Park Subdivision project site. It summarizes the analysis criteria of the proposed storm drain collection and conveyance systems as well as provide the calculations and discussion necessary to confirm the capacity of the proposed on-site storm water facilities that will support the development. The analysis and supporting calculations for the sizing of the proposed on- site temporary erosion and sediment control facilities are also provided with this report. The Delaney Park Subdivision project site is located at 1 201 9 148�' Avenue SE in Renton, Woshington. More generally,the site is located in the NE '/a of the SE �/a of Section 10,Township 23 North, Range 5 East, W.M., King County,Washington. The project site has a total area of 8.81 acres and is comprised of b separate parcels (KC parcel Nos.: 1023059350, 1023059368, 1023059391, 1023059189, 1023059346 and 1023059345). Figure 1 provides a vicinity map highlighting the regional location of the Delaney Park Subdivision. � ,� ��T 4 -� t._ � ; . _— � _ � _ 1 , _. ... . _ . � �: �, , _ ��'�-= ` IT _ �`�! ..1:�_ „T�� r=L7�.L�� .�f --.�' . � k_ '1 � ' _ , : � ^ ' , �. _ , , ._ —� � �- — -- ; v . . _ __ _ ��- �R(�JEG�'�SI�T�, __ _ �` ,r_ i�J zL-�_ � � � �� - . - - ��--- ��:- - .�� . - - _ _ _ � -. � _ _ �t -- -�_�__ �r ; � __;� . - __ - - __ � � ,___�-__ __� � � _ -�-�, ''I tu L _�-- _" ` _ ' �, , �' = �_ --- � . _ _ � �- ' - l� _ �,� t:�-�-:� __ __ rc•� �, ,F-- - '_ _ _ - - : _-- !':T`If.,�'.�: �'`i�.i-�, -I. — � r�� t��_ y_ — ._. .I - _ -- -- , i '; _ —=- _ � i -� ,� -,. _: ,-*�—.� +--� �- �--_ , � I E ; � L._,;.� � Z�r j-Y i �= �� j.:r ` �—{�,.` �"�-- �;� _ —'F`�� z� T'J-.�,r-- _ --- I 1 --�,�� -1 T. . L Il��1 _ ...,._._ -i- -.� _J � �,`_��x.;r�;7*�4--x,:,��',..k ,�.. � F'ti:��i,�'T'� _ �� -- � ��+-�`� _ � _ � _�S �1 � 1+,i� .�� - �_ :'1T5 E 1.,� � �1L� ��rf"r��r�- �� '"J__ �! 1 �_:� -- 1� � ' �f� :� -_-_-a ��rx� "� xTi?µ � 'i ___— �� 4�_ � f _�' �-+--,��,� � T--�;l. �P� ��. t_��.`��'�� -�,� a�. � _ : 1'';�^ :. � � _ - : � �,�� w - �„� I�,- � �.- -- T ��_ ` �� c� ��--,_� i _ ��j�--�- _._ -�. : f�� --�-� r ..-r `_ —� �Q-�_ _ -} _ ..aI u . T i�lQl17� : �i .. I � �� – �-•�-n � � j � P.,¢� i _�-3 [' � �u�, .T �t� � ; ' .�. � � II �� _ . _ ; .... , � _....i ,�. ['� -,_..��,I7T `�� -- rx 1 � � � _: � _��I+ I --{� � 1 -�:,:� _ - r. � " �_ `_-`� �� --1�j -=L-� ---��-- "_-- - l��'� -�:_� ��--T �`�. �-� �-. ''�i�;-,�=r` „ -_ .-. —_ ---�-- —� ��f�� , _� , � � -- �� u % �,.,� '� ; _: � �— � r ,��., s — L t� _� f � - _, . sT � r r � t �i�,: � r -- I �� _� r�`. r �', :_, _, � � �— �,�--- - ; { I �'� ��-4''�� _ �� 1.�E='N , �i� -� � r `��-- - , ,� -r-- � � � � �� —1 t� �.�� i�''r�,-1 �� -� _.� l j_`=:� f'?�t�i� , ti t-h _ _._. �.�4 1 �1{�'. , �._ ---�._ _ T_ , _ , � —:.� T l.. _� i �; ; � - -i f�� ;k� i � � �,-� _.-: . � ,F NOT TO SCALE _ '�� r..—:,} � — Figure 1 — Locatron�Vicinity Map There are 4 existing single-family residences, garages, barns and other various out buildings currently located on the site (see Figure 4 -Existing Site Conditions). The rempining ground cover in the developed portion of the project consists of pasture or residential landscaped areas. All existing development occurs on the eastern half of the project site, as the western half of the project site has four delineated wetlands and associated buffers. CPH Project No.0011-08-006 May 12,2009 CP I H CONSULTANTS Page 1 Delaney Park Subdivision Technical Information Report The existing topography falls westerly at slopes between 5 and 20% on the eastern half of the site. The existing drainpge basin is generally contained within the (ot boundaries flowing parallel with the east/west property boundaries. The project proposes to subdivide the parcels into 27 single-family residential lots on the 4.68 acres of developable area.The western portion of the site consisting of wetland and associated buffer will remain undeveloped within a sensitive area tract. Access to the subdivision will be provided by a single access road heading west from 148"' Ave SE with a stub for future connection to the East Renton (Rosemonte) development to the north. The subdivision is vested and has an approved preliminary plat application from the King County Department of Development and Environmental Services under File No. L07P0010 and Ordinance No. 2008-0591. However,the area will be annexed by the City of Renton. It is anticipated that the annex will be completed by the Summer of 2009. Construction plan permitting and platting approval will be performed by the City of Renton based on the vested King County zoning and design criteria stated in the preliminary plat approval. Storm water flow control for the project is proposed by means of an on-site, below grade vault facility. This facility is to be located within the proposed storm water tract in the southwest corner of the developable area as shown on the Grading and Drainage Plans. A series of on-site catch basin inlets and underground pipes will collect and convey surface water runoff westerly within proposed road right-of-way for ihe majority of the developed site to the storm water vpult. Roof drainage from four of the north-westerly lots will be collected separately and dispersed along the edge of the sensitive area tract to maintain wetland hydrology and implement limited impact development (LID) techniques for the project. Site Soil Conditions '� The soils on the site are characterized as Alderwood gravelly, sandy loam (AgB and AgC) with 0- 15% slopes per the Natural Resources Conservation Service Soil Survey for King County. These glacial till soil units are moderately well draining and are identified as having very low avpilpble water capacity. A summary of the soil descriptions is provided in Section 3.2. CPH Project No.001 1-08-006 May 12,2009 CP�H CONSULTAM-S Page2 � — CP H CONSULTANTS FIGURE 2 TIR WORKSHEET Site Planning Civil Engineering Projed Management lond Development Consulting KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND '� Part 2 PROJECT LOCATION AND PROJECT ENGlNEER ' DESCRIPTION Project Owner: Rick Bumstead Construction Project Name: Delane Park Subdivision Phone: 425 454-1900 DDES Permit#: L07P0010 Address: 11980 NE 24 'St, Suite 200 L�cation: Township: 23 N Bellevue, WA 98005 Range: 5 E Project Engineer: Jamie B. Schroeder, PE Section: 10 Phone: 425 285-2390 Site Address: 12019 148th Ave SE ' Part 3 Tl'PE'OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS ■ rvices ❑ DFW HPA ❑ Shoreline Subdivison / Short Subd. / UPD ❑ COE 404 Management ❑ u ' ervices ❑ DOE Dam Safety ■ Structural � M/F / Commerical / SFR ❑ FEMA Floodplain RockeryNaulU ■ Clearing and Grading ❑ COE Wetlands ❑ ESA Section 7 ❑ Right-of-Way Use ■ Other NPDES General Permit ❑ Other Part � PLAN AND REPORT(NFORMATION Technical Infor ' n Report � Site Improveme (Engr. Plans) Type of Drainage Full Targeted / Type (circle one): Full Modified / / Review(circle): Large Site Small Site Date (include revision Date(include revision dates): 5-12-09 dates): 5-12-09 Date of Final: Date of Final: Part 6 ADJUSTMENT APPROVALS Type (circle one): Standard / Complex / Preapplication / Experimental / Blanket Description: (include conditions in TIR Section 2) Date of Approval: 2005 Surface Water Design Nianual 1 1/1/0� KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 7 MONITORING REQUIREMENTS Monitoring Required: Yes No �Describe: � � Start Date: Completion Date: Part 8 SITE COMMUNITY AND DRAINAGE BASIN Community Plan: Newcastle Special District Overlays: None Drainage Basin: Ma Creek Stormwater Requirements: 2005 KCSWDM Part 9 ONSITE AND ADJACENT SENSITIVE AREAS I ❑ River/Stream ❑ Steep Slope ❑ Lake ❑ Erosion Hazard ■ Wetlands ❑ Landslide Hazard ❑ Closed Depression ❑ Coal Mine Hazard ❑ Floodplain ❑ Seismic Hazard ❑ Other ❑ Habitat Protection Part 10 ' 'SOILS _ Soil Type Slopes Erosion Potential Ag6 0-6% AgC 6-15% moderate ❑ High Groundwater Table (within 5 feet) ❑ Sole Source Aquifer ❑ Other ❑ Seeps/Springs ❑ Additional Sheets Attached 2005 Surface 1�vater Design Manual 2 1/1/05 KING COUNTY WASHINGTON, SURFACE WATER DESIGN MANUAL _ TECHNICAL INFORMATION REPORT (TIR) WORKSHEET � Part 11 DRAINAGE DESIGN LIMITATIONS ' REFERENCE LIMITATION 1 SITE CONSTRAINT i ❑ Core 2 —Offsite Analysis I ■ Sensitive/Critical Areas ' ❑ SEPA ❑ Other ❑ ❑ Additional Sheets Attached � Part 12 TIR SUMMARY SHEET (pravide one TIR Summary Sheet per Threshold Discharge Area}: f,; Threshold Discharge Area: Basin A (name or description Core Requirements all 8 appl Dischar e at Natural Location Number of Natural Dischar e Locations: 1 ' Offsite Analysis Level: 1 2 ! 3 Dated: 3-2-09 Flow Control Level: 1 / 2 3 or Exemption Number (include a facility summary sheet) Sm211 Site BMP's: Conve ance S stem S ill containment located at: Erosion and Sediment Control ESC Site Supervisor: Greg Strong Contact Phone: 425-454-1900 After Hours Phone: 206-396-5471 � Maintenance and Operation Responsibility: Private / ublic If Private,Maintenanc uired: Yes / No Financial Guarantees and Liabilit Prov� Yes No Water Quality Type: Basic / Sens. Lake / Enhanced Basic / Bog (include facility summary sheet) or Exe O. Landscape Management Plan: Yes / No Special Requirements as applicable Area Specific Drainage Type: CDA / SDO / MDP / BP / LMP / Shared Fa one Re uirements Name: j Floodplain/Floodway Delineation Type: Major / Minor / Exemption one 100-year Base Flood Elevation (or range): Datum: Flood Protection Facilities Description: Source Control Describe landuse: (comm./industrial landuse) Describe an structural � /A Oil Control High-use Site: Yes Treatment BMP: Maintenance Agreement: Yes / No with whom?: Other Drainage Structures Describe: 2005 Surface Water Design ivlanual 3 1/1/05 KING COUNTY WASHINGTON, SURFACE WATER DESIGN MANUAL TECHNICAL INFORMATION REPORT {TIR) WORKSHEET Part 13 EROSION AND SEDIMNET CONTROL REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION ■ Clearing Limits ■ Stabilize Exposed Surfaces I ■ Cover Measures ■ Remove and Restore Temporary ESC , ■ Perimeter Protection Facilities ', ■ Tra�c Area Stabilization ■ Clean and Remove All Silt and Debris Ensure ' ■ Sediment Retention Operation of Permanent Facilities ■ Surface Water Control � ■ Flag Limits of SAO and open space ■ Dust Control preservation areas ■ Construction Sequence ❑ Other Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and 5ketch} � Flow Control T pe/Description Water Qualit T perDescription ■ Detention Vault ❑ Biofiltration ❑ Infiltration ■ Wetpool Vault ❑ Regional Facility ❑ Media Filtration ❑ Shared Facility ❑ Oil Control ❑ Small Site BMP's ❑ Spill Control � Other ❑ Small Site BMP's ❑ Other Part 15 EASEMENTS 1 TRACTS ; , Part 16 STRUCTURAL ANALYSfS I i j ■ Drainage Easement ■ Cast in Place Vault � ❑ Access Easement ■ Retaining Wall 'i ❑ Native Growth Protection Covenant ■ Rockery> 4' High I ■ Tract ❑ Structural on Steep Slope �, ❑ Other ❑ Other i � ' ; Part 17 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were incorporated ' into this worksheet and the attached technical Informati�n Report. To the best of my knowledge the information ' provided here is accurate. I . � � ��-- S-/2 -�9' Signed Date 2005 Surface Water Design Manual 4 1/1/0� Delaney Pork Subdivision Technical Information Report SECTION 2 - CONDITIONS AND REQUIREMENTS SUMMARY Compliance with Projed Drainage Requirements The 2005 King County Surfoce Water Design Manual (KCSWDM) identifies the following eight core requirements and five special requirements that shall be met for the project: KCSWDM Core Requirements 1. Distharge at Natural Location: The project will maintain natural surface water runoff patterns within the May Creek drainage basin. 2. Off-site Analysis: Summarized in Section 3 — Off-site AnaJysis. 3. Flow Control: Summarized in Section 4–Flow Confrol and Water Quality Facility Analysis and Design. The lots that contain dispersed roofs that drain toward a sensitive area tract will employ "basic dispersion" methods of surface water control and will reduce detention requirements of the formal flow control facility.The remaining portions (i.e., easterly limits' of the Delc��ey Park Subd=�ision r.�-oiec• .:�!i c3rtiin to c, ne:, _omb��,�d ,:;at�r� qoc ity ard de`ention vault. 4. Conveyance System: Summarized in Secfion 5—Conveyance System Analysis ana '�� ;;• 5. Erosion and Sediment Control: Described in Secfion 8 —ESC Analysis and Design 6. Mainten .. _ _ Manua(. 7. Financial Guarantees and Liability: See Section 9 - Bond Quant;ty Worksheet, Faci1,; Summaries, and Declarafion of Covenant. 8. Water Q�ality:The development provide basic water quality treatment for pollution generating impervious surfaces.This is summarized in Secfion 4—Flow Control and Water Quality Facilify Analysis and Design. KCS WDM Special Rec�uirements 1. Other Adopted Area-Specific Requirements: No area-specific requirements apply to this project site. 2. Flood Hazard Area Delineation: The limits of these project sites are not located within or in proximity to the 100-year floodplain. 3. Flood Protection Facilities: Not applicable. 4. Source Control: There are no additional source control facilities or BMP's proposed with this p roject. 5. Oil Control: No oil control facilities are required or proposed with this project. CPH Projeci No.0011-08-006 May 12,2009 CP�H CONSULTANTS Page 3 Technicaf Informatron Re ort I Delaney Park Subdiv�sion p Delaney Park Preliminary Plat Approval The Delaney Park Subdivision entitled for development with specific conditions of approval by King County Department of Development and Environmental Services File No. L07P0010 proposed Ordinance No. 2008-0591.The Report and Decision issued by the King County Hearing Examiner is provided in Section 2.1. CPH Project No.0011-08-006 May 1 2,2009 CP I H CONSULTANTS Page 4 CP H CONSULTANTS SECTION 2. 1 ' PRELIMINARY PLAT REPORT AND DECISION , Site Planning (iril Engineering Projeci Manngement Land Development Consulting January 6,2009 OFFICE OF TIiE HEARING EXAMINER REC�lVED KING COUNTY,WASHINGTQN 40U Yesler Way,Room 404 Seattle,Washington 98104 JAN 0 7 2009 Telephone(206}296-46b0 Facsimile(206)296-1654 CPH CONSULTANTS Email: hearingexarniner@kingcounty.gov REPORT AND DECISION SUBJECT: Department of Development and Environmental Services File No.LO'7P0010 Proposed Ordinance No.2008-0591 DELANEY PARK Preliminary Ptat Application Location: West side of 148th Avenue Southeast and approximately 160 feet south of Southeast 120th S2reet Applicant: Rick Bumstead Construction Company represented by Matt Hough CPH Consultants 733 Seventh Avenue,Suite 100 Kirkland, Washington 98033 Telephone:(425)2875-2390 King County: Department of Deve(opment and Environmental Services{DDES} represented by Kimberly Claussen 900 Oakesdais Avenue Southwest Renton,Washington 9$OSS 7'elephone:(206)296-7167 Facsimile: (206)29b-7051 St3MMARY O�RECOMMENDATIONSlDECISIC?N: Department's Preliminary Recommendation: Approve,subject to conditions DepartmenYs Final Recommenda[ion: Approve, subject to conditions(modified) Examiner's Decision: Approve, subject to conditions{modified) EXAMINER PROCEEDINGS: Hearing Opened: December lb,2048 Hearing Closad: December 16,2008 Participants at the pub(ic hearing and the exhibits offered an�entered are listed in the attached rninutes_ t.(37i'll(Ilu- Ucl��nc�• � ;� �-crhatim rccordin�:of thc hearing is avail�ble in the of'fice af�the Kin�County Hearin� ��amincr. tSSUES AND TOPICS ADDRESSED: Road improvements; schoul bus I�adi�ig area SUMMARY: Suhdivision of 27 3ots on 8.&I acres in the urban area is approved, subject to conditions. �'I?1DRJGS, COi�iCLliS10NS& D�ClSION: Having reviewed the record in this matter, the Examiner now makes and enters the followi»g: FIN D INGS: l. GeneralInformation: Owne�:'Developer: Rick Burnstead Construction Company 1 1980 Northeast 24th St., Suite 200 Bellevue, WA 98005 �125-454-I 900 Engineer. CPH Consultants 733 Seventh Avenue, Suite 100 Kirkland, Vb'ashington 98Q33 (425}2875-2390 STR: ]0-23-OS Location: The site is located on the west side of i48th Ave SE and approximately t 60-feet south of SE 120th St.Pastal City Renton Zon i ng: R-4 Acreage: 8.81-acres Number of Lots: 27 Density: Approximately 3 units per acre Lot Size: Ranges from approximately 4,700 to 7,000-square feet in size Proposed Use: Singie Family Detached Dwetfings Sewage Disposaf: City of Renton Water Suppty: King County Water District No. 90 Fire District: King Counry Fire District No. 10'Eastside Fire& Rescue School Uistrict: issaquah Date Application Filed: July 24,2007 Comp)ete Appfication Date: August 20,2007 2. Except as modified herein,the facts set fortli in the King County Land L'se Sen�ices Division's (LUSD) preliminary report to ihe King County Hearing Examiner for the December 16,2008, public i�earing are Found to b�correct and are ineorporated herein by this reference. The I_.I;�SD staCf recvmmends approval of the appiic�►tion, subject to conditions. LO7P(?U 1�-Delaney 3 3. The pra�ased development is subject to the requirements of the 2005 King County Surface Water Design Manuai. 4, The Issaquah School District has requested that a school bus Ioadzng pad be construcied on 148th Avenue Southeast,to provide increased safety for studei�ts who will travet to and fr�m schaol by bus. The applicant has agreed to constrttct the loading pad in the vicinity of the intersectioo of the new sub-access street with 148th Avenue Southeast. This improvement is concepttially shown on ihe applicant's preliminary site plan. CONCLUSIONS: 1. If approved subject to the conditions recommended be�ow,the proposed sui�divis+on will comply with the goals and objectives of the King County Comprehensive Pian,subdivision and zoning codes,and other of�icial land use conirols and policies of King County. 2. If approved subject to the conditions recommended below,this proposed subdivision wilt make appropriate provision for the public health,safety and genera!welfare,and for o�n spaces, drainage ways,streets,other public ways,transit stops,potable water supply,sanitary waste, parks and recreation,playgrounds,schools and school grounds and safe walking conditions for stucients who only walk to school;and it�vill serve the pubiic use and interest. 3. The conditions for final plat approval recommended below are in the pubfic interest and are reasonable and proportionate reqe�irements necessary to mitigate the impacts of the development upon the environment. 4. The dedications of land or easements within and adjacent ta the proposed plat,as required for fina! plat approval or as shown an the revised preliminary plat submitted by the Applicant on September 29,2008,are reasonable and necessary as a direct result of the development of this proposed plat,and are proportionate to the impacts of the devetopment. 5. The applicant's proposal to construct the access road with a driving width of 36 feet curb to curb, to aUow for parking on both sides of the street without the necessity for installation of sprinklers in the residences to be constructed in this plat,exceeds the minimum requirements of the King County Road Sta.ndards for a sub-access street. Final engineering plans could provide for less width of the roadway,consistent with the King County Road Standards, if the applicant agrees to meet the al[ernative requiremenis of the King County Fire Marshal(e.g.,sprinklers or parking restrictions}. 6. Although the City of Renton has requested that road improvements meet city standards,this application is subject to the King County Road Standards. King County dces not have the authority to require that improvements meet City of Renton standards. 7. The applicant should be requzred to construct the school bus stop loading pad as requested by the Issaquah School District, in order to reasonably provide for the safety of students who wilf be bused from this development to and from issaquah schools. Lll?I'(1O10-- 17LIunr�• a nE�cr��o�v: � "1'he pr•oposed �lat c�f�elai�e.y !'ark, as revised aalel receive� nn Se��temher 29, 2008, is�ranted S�reliminary approval, subject to khe fol(o�ving c�nditions of finaE plat approval: E. Compliance with all platting provisions ofTitle 19A of the King Counry Cade. � ?. A11 persons havino an oHmership i��terest in the subject property shall sign on the tiace of the tinal plat a dedication that includes the (anguage set farth in King County Couiicil Motion No. 5952. 3. The plat shall comply with tlie base density and �ninimum der�sity requirements of tlle R-4 zone classification. All Iv[s shall meet the minimum dimensional requirements of the R-4 zone classification or shall be shown on the face of the approved pre(iminary plat, whichever is larger, e�cept 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 Environment Services. Any/all plat boundary discrepancy shall be resolved to the satisfaction of DDES prior to the submittal of the fina] plat documents_ As used in this conditian, "discrepancy" is a boundary hiatus, an overlapping boundary or a physical appurtenance which indicates an encroachment, lines of possession or a conflict of title. 4. All co��struction and upgrading of public and private roads sha(1 be done in accordance�y�ith the Kin�County Road Standards established and adopted by Ordinance No. 15753 {2007 KCRDCS) 5. The applica�it must obtain the appraval 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. Any futtire residences constructed within this subdivision are required to be sprink{ered NFPA 13D unlessthe requirement is removed by the King Counry Fire Marshal or his/her designee. Tl�e Fire Cocfe requires all portions of tlie exterior walls of structures to be within l50 feet (as a person woulcf��alk via an approved route around the huilding) from a minimum 20-foot wide, unobstructed driving surface that is not over 150 feet in length if dead-end. Vehicles parked on roadwav surfaces or within the cul-de-sac are an obstruction. To qualify for removal of the sprinkler reyuirement the curb-to-curb driving surface of the roadway witllin the proposed subdivision has to have a minimum curb-to-curb width of 36 f'eet iF parking is permitted on both sides of the roadway;or 28 feet if parking is allowed on only one side. The driving surfaces of Tracts C and D must also be a minimum of 20 Feet in width. Additionally,the tire hydrant requirements outlined below must be met. A separate permit is reqE�ired for the installation of water mains andlor fire hydrants. Submit three (3) copies of drawings and specifications to DDES Building Services Division Pennit Service Center for a permit application. Review and approval by Fire 8ngineering Section is required prior to installation. Plans shall include, but are not limited to; pipe sizes, pipe type, valves/fittings,thrust blocks and/or rodding and materiai listings. Fire hydrants shail be installed per K.C.C. Title f 7 Vl�'ater mains shall be installed and tested per AW WA standards andJor NFPA�24 (S'CA�IDARDS FOR PRiVATE FIRE HYDRAI�TTS AND WATERMAINS); as applicabie Ref. lUU1.4 UFC LU7P001t3—Delaney 5 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.�4. Compliance may resutt in reducing the number and/or location of lots as shown on the preliminary approved plat. Preiiminary review has identified the following conditions of approval which represent portions of the drainage requirements. A(1 other appiicable requirements in K.C.C.9.04 and the Surface Water Design Manual(SWDM)must also be satisfied during engineering and fnal review. a. Drainage plans and analysis shatl comply with the 2005 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 foltowing 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 an the approved construction drawings# on file with DDES andlor the King County Department of Transportation. This plan shatl be submitted with ttie 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 !ot infiltration systems,the systems shall be constructed at the time of the building permit and shail comply with plans on file." 7. The drainage facilities shall meet the requirements of the 2005 King County Surface Water Design Manual(KCSWDM). The drainage design shall meet at a minimum the Conservatian Flow Control and Basic Water Quality Treatment requirements in the KCSWDM. ' 8. Ta implement the required Best Management Practices{BMP's)for treatment of storm water,the final engineering plans and technical information report(TIR)shall clearly demoastrate compliance with all applicable design standards. The requirements for best management practices are outlined in Chapter 5 of the 20U5 KCSWDM. The design engineer shail address the appticable requirements on the final engineering plans and provide a[I necessary documents for implementation. The final recorded plat shali include all required covenants,easemenis,notes, and other details to implement th�required B?VIP's for site development. 9. The 100-year floodplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Speciat Requirement 2 of the KCSWDM. l0. The following road improvements are required to be constructed according to the 2007 King County Road Design and Construction Standards(KCRDCS): a. The internal access road(Road A)shall be improved at a minimum to the urban subaccess street standard;with a temporary cul-de-sac at the nartherly end, unless otherwise approved by DDES. Note that the applicant is proposing a 36 feet wide road vs.the minimum required 24 feet wide subaccess road. The applicant's proposed raad width in excess of the minimum required by the King County Road Standards is a voluntary proposal,which may be modified by the applicant during the final engineering plan teview, provided that the minimum requirements of tbe King County Road I n?!'DU 1 ti I l�lancy (, Standards are met and any alternative requirements c>Ftl�e Kin�Co�mty Fire Marshll are implerner�ted. b. FftONTAGE: The frontage along l4R'�'rlve SE{wes[side)Shall t�: i�nproved at a minimum to the urban arterial collector standard. "This improvement shall meet the Street requirements in Sectioo 4.03 of tlie KCRDCS. In additio�i to the frontage impravement,a road loweriisg improvement is required to achieve sight distance along 148'" Ave SE in�eneral cornplia�ice�vith the 5topping Sight Distaiice Plan received Sept. 28''',2008. The road lowering is ort 148'"Ave SE from the Road A intersectian to appro�inzately 330 feet south. c. Paired curb ramps shall be provided at the Road A/ 148'°Ave SE intersection per Section 3.05 of the KCRDCS. d. A school bus loading pad will be provided as conceptually shown on the preliminary site plan(sheet 1 of 7)to accommo�ate the request contained in the Issac�uah School Disirict ]etter dated 1/8/07. e. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.12 of the KCRDCS. '� l ]. Ali utilities within proposed rights-of-w•ay must be included within a franchise approved by the Kin�County Councii prior to final plat recording. � l2. The applicant or subsequent owner shall comply with Kiiig Coutity Code 14.75,Mitigation Payment System(MPS},by paying the required MPS fee and administration fee as determined by the applicable fee ordinance. The appiicant has the option to either: (1)pay the MPS fee at the final plat recording, ar(2)pay the MPS fee at the time of buiiding permit issuance. �f the first option is chosen,the fee paid shall be the fee in effect at the time of plat application and a note shal] be placed on the face of the plat that reads, "All fees required by King County Code t4.75, Mitigation Payment System (MPS),have been paid." Tf the second option is chosen,the fee paid shall be the amount in effect as of the date of buildin�permit application. f 3. Lots within this subdivision are subject to King Counry Code 21 A.43, which imposes impact fees t� fund schoo( system improvements needed to serve new development. As a condition of final approval, fifty percent(SQ%)of the impact fees due for the plat sh�ll be assessed and collected immediately prior to the recording, using the fee schedules in effect when the plat receives final approval. The halance of the assessed fee shall be allocated evenly to the dwelling units in the plat and shall be collected prior to building permit issuance_ 14. There shall be no direct vehicular access to or from l48`�'Ave S� from those lots which abut it. f1 note to this effect shall appear on the engineering plans and the final plat. 15. The �ropc�sed subdivision shall comply ��•ith the Criticat Areas Code as ot�tlined in K.C.C. 2 I A.24. Pennanent survey marking and signs as specified in K.C.C. 21 A.24.160 s}iall aiso be addressed prior to fin�l plat approval. Temporary marking of stnsitive areas�nd their buffers (e.g., with bright orange construction Fencing)shail he ptaced on the site ane� shall remain in place until all construction activities are completed. L07P001 U—Delaney 7 16. Preliminary plat review has identified the following specific requirements which apply to this project. All other appticable requirements from K.C.C.2l A.24 shall also be addressed by the applicant. Wetlands a. Wetland A is a Category 11�wetland and shalf have a 75 foot buffer as measured &om the wetland edge. b. Wetlands B, is a Category III wetiand and shall have a 75 foot buffer as measured from the wettand edge. c. Wetlands C, is a Category III wetland and shalt have a 75 foot buffer as measured from the wetland edge. d. Wetlands D,is a Category IV wetland and shall have a 50 foot buffer as measured from the wetland edge. e. The bnffers for Wetlands C and D maybe modified as proposed on the preliminary plat map dated September 8,2008. f. Alt wetlands and their buffer shall be placed in a Criticai Areas Tracts(CAT)as shown on ihe preliminary plat map dated September 8, 2008 for long term protection. g. A 15' building set back tine is required from the edge of Critical Area Tracts and shall be shown on atl affecteci lots. h. Prior to construction activities the CAT boundary shall be clearly marked with both bright orange construction and erosion control fencing. The fencing shalt remain in place until all construction activities are complete. r. Prior to ptat recording the applicant shall detineate the boundary between the adjoining property and CATs using uon or concrete markers as established by current survey standards. The applicant shall also identify the CA'T boundary with permanent signs and fencing along adjacent lots andlor recreation tracts. The permanent fence shall be Cedar split-railed or similar and no more than four feet in height. j. Engineering plans shall be routed to the Critical Areas Section for review and approval ' of the above conditions. k. The following note shal!be shown on the final engineering plan and recorded plat: RESTRICTIONS FOR CRITICAL AREA TRACTS AND CRITICAL AREAS AND BUFFERS Dedication of a critical area tracdcritical area and buffer conveys to the public a beneficial interest in the land within the tracdcritical area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health,safety and�velfare, inctuding control of surface water and erosion, maintenance of slope stability,and protection of plant and animal habitat. The critical area tract/critical area and buffer imposes upon atl present and future owners and occupiers of I.tl%I'OUI(I- 1)riaii�� g the land su�ject to �he tract/critical area and buffer the obli�,atio��, enforceabie��ra hehalf c�Fthe public by King C��unty_, to leave undisturbed all trees and other ve£etati�n �vithin the tracdcritical area and buffer. "i�he vegetatian witiiin the lracUcritical area and buffer may noE be cut,pruned,covered by fill, removed or damaged without approval in writing From the King County Department of Development and En��ironrrtenta! Services�� iu successor agency, unless otherwise provided by law. The con�mon boundary between the tract/critical area and buff'er and the area of developme�u activiry 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 critical area tract/eritical area and buFfer. The required inarking or fla�ging shall reinain in place until all development proposaf activities in the vicinity of the c�•itical area are completed. No btiiEding foundations are a{iowed beyond the required i 5-fooi building setback line, unless ocherwise provided by taw. l 7. Suitable recreation space shall be provided consistent with the requirements of K.C.C. 21A.14,I80 and K.C.C.21 A. 14.190{i.e., sport court[s],chi[dren's play equipment, picnic table[sj,benches,etc.). a. A c�etailed recreation space plan(i.e., location,area calculations,dimensions, landscape specs, equipment specs, etc.)shall be submitted for review and approval by DDES and King County�Parks prior to or concurrent with the s«bmittat of er►gineering plans. b. A perfonnance bond for recreation space improvements shall be posted prior to recording of the plat. 18. A homeowners'association or other workable organization shali he establistied 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 shali be provided as follo«�s(per KCR.DCS 5.03 and K.C.C. 21A.16.050}: a. Trees sllall be planted at a rate of one tree for every d0 teet of fcontage along alf roads. Spacing may be mod;'fied to accommodate sight distance requirements for dr�veways and inte��sections. b. Trees shall be located within the street rigl�t-of-way and pEanFed in accordance with Drawing No. 5-009 of the 2U07 KCRDCS 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 shouid not be located within the right-of=way, they shall be located no more than 20 Feet from the street right-af-way line. d. "�'Ize irees shall be owned and mainiained by the abutting lot owners or the horrieow•ners association or other workable organization unless the county l�as adopted a maintenance pro�ram. Ownership and maintenance shall be noted on the face of the tina! recorded plat. L07P0010—Delaney 9 e. The species of trees shall be approved by DDES if located within the right-of-way,and shall not inc3ude poplar, cottonwood,soft maples, gum,any fruit-bearing uees,or any other tree or shrub whose roots are likeiy to obstzvct sanitary or sionn sewecs,or that is not compatible with overhead utility tines. 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 applicant shall contact Metro Service P3anning at(206)684-1622 to determine if 148'�Ave SE is on a bus r�ute. If so,the street tree plan shall also be reviewed by Metro. h. The streeE trees must be installed and inspected,or a performance bo�d posted prior to recording of the plat. If a performance bond is posted,the street trees must be installed and inspected within one year of recording of the plat. At the time of inspecEion, 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 heid 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. 20. To imp(ement K.C.C. 16.82.156 which applies to the site,a detailed tree retention plan shall be submitted with the engineering ptans for the sabject plat. The tree retention pian{and engineerir�g plans)shall be consistent with the requirements of K.C.C. 16.82.156. No clearing of the subject property is permitted unti!the fmal tree retention plan is approved by LUSD. Flagging and temporary fe,ncing of trees ta be retained shall be provided,consistent with K.C.C. 1 b.82.i 56. The placement of impervious surfaces,f ll materiai,excavation work,or the storage of construction materials is prohibited within the fenced areas around preserved trees,except for �ra.ding work permitted pursuant to K.C.C. 16.82.156_ A note shall be placed on ihe final plat indicating that the trees shown to be retained on the tree retention plan shall be maintained by the future owners of tfie proposed lots,consistent with K.C.C. (Note that the tree retention plan shall be included as part of the final engineering plans for the subject plat.) ORDERED this 6th day of January,2009. °-^"�.�.�-� . C.a\ 1. J es N.O'Connor b King Counry Hearing Examiner pr� tem 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 Couneil with a fee of$250.00(check payabte to King County Office of Finance)on or hefore January 20,2009. If a notice of appeal is filed,the original and six(6)copies uf a written appeal statemeni specifying the basis for the appeal and argument in support of the appeal must be fled with the Clerk af the King County Council on or before January 27,2009. Appeal statements may refer only to facts cantained in the hearing record;new facts may not be presented on appeai. I.U?P001(1-I)clancy il) Filing requires actual delivery to the Office oF the Clerk of dte Council,Rooin i Q25, King Caunty C��urthouse, �I fi 3"�,Avenue, Se.�ttle. 1ti'�shiagEoii 9S 14�#, prior to the close of business (4:30 p.m.)on the dxte due. Prior maiting is not,«fficient if actiial receipt by the Clei-�does not occur within the applicable time period. 1'he Examiner does not}�ave authority to extend the time period unless the Office af the Clerk is not ope�� on the specitied closing date, in which event delivery prior to the close of business on the ne�t business day is sufficient to meet the fiti�ig requirement. If a �vritten notice of appeal and tiling fee are not Filed within fourteen(14)calendar days of the date of dzis report, or if a written appeal statement and arguntent are not filed within twenty-one(21)calendar days of the date of this report,the decision of the hearing examinec contained herein shali be the fina[ decision of Kircg Counry without ihe need for further action by the Council. MINUTES OF THE DECEMB�R I6,2008,PUBLIC EtfiARING ON DEPARTMEI�'T OF DEVELOPMENT AND E�tVIRONMENTAL SERVTCES FILE N�. L07P0010. James N. O'Connor was the Hearing Examiner in this rr�atter. Participating in the hearing were Kimberly Claussen and Bruce Whittaker representing the Department and Matt Hough representing the Applicant. The following Exhibits were offered and entered into the record: Exhibit No. 1 Department of Development and Environmental Services (DDES} file no. L07P00 t Q Exhibit N�. 2 DDES Preliminary RepoR,dated December 16,2Q08 Exhibit No. 3 Application for Land Use Permits received July 24, 2007 C-.�chibit No. 4 State �,nvironmenta! Policy Act(SEPA)checklist received Juiy 24,2007 EYhibit No. 5 SEPA Determination of Non-Significance issued 4ctober 17, 20�8 E�chibit No, 6 AFfidavit of Postin�indicating a posting date of�ugust 29,20d7; received by DD�S ', on August 30,2007 Exhibit�lo. 7 Preliminary Plat map,re��ised September 25,2�08, received September 29,200$ F.xhibit No. 8 King County Assessor maps: SW 11-23-QS,dated March 17, 2006;N W 11-23-05, dated January 2G,2007; SE t 0-23-05, dated April 11,2006;NE 10-23-05,dated June 26,2007 Exhibit No. 9 Level 1 Offsite Analysis dated July 20,2007 Exhibit Na. !0 December l7,2007 Revised Level 1 Offsite Analysis Exhibit No. 1 I Wetland and VVildlife Assessment dated 3uly 19,2007 E�ibit No. 12 rlddendum to Vb'etlanti and Wildlife Assessment dated December 13,2007 E�chibit No. 13 January 3l,2408 Addendum to Wettand and Wildlife Assessment Exhibit No. 14 Traffic trnpact Analysis dated July 17,2007 E�ibit No. 15 December 18,2007 Supplement to Traffic Impact Analysis Exhibit No. 1 b Preliminary Grading and Drainage plan revised January 29,2008 Exhibit No. 17a Gregg 7immerman, City of Renton, letter regarding appIicabl�road standards for proposed plat,dated September 28, 2007 Exhibit No. 17b Gre�g Zimmerman, City af Renton, letter regarding SEPA decision; dated October 28, 2008 Exhibit Nu. 18 !'ublic cornments of Gaudia Donnelly regarding downstream (from proposed piat} floodino,received November 6, 2048 Exhibit No. I9 �ntering Sight Distance plan, revised September 25,2008 Exhibit No. 20 School Walk map dated July 20, 2007 .MOC:gao LC�?�40!!? RF'"f January 6,2009 OFFICE OF THE I3EARING EXAMINER IQNG COUNTY,WASHINGTON 40U Yesler Way,Room 404 Seattle,Washington 98104 Telephone(205}296-4660 Facsimile(206)296-1654 Email hearingexaminer�a.kingcount�gov CERTIFICATE OF SERVICE SUBJECT: Department of Development and Environmental Services Fi(e No.L07P4010 DEI.ANEY PARK Preliminary Plat Application I, Ginger O�rmundt,certify under penatty of perjury under the laws of the State of Washington that I transmitted the Report and Decision to the fo[lowing parties of record and interested persans: Terra Behan Brian Berg Claudia Donnelly 11920- 248th Ave.SE 12035- 148th Ave. SE 10415- ]47th Ave.SE Renton WA 98059 Renton WA 98459 Renton WA 98059 Gwendolyn High Jaymarc Development Mead Gilman&Assoc. C.A.R.E. 555 S Renton Village PI Ste.715 Shane Bames P.O.Box 2936 Renton WA 9&O55 P.O.Box 289 Renton WA 98059 Woodinville WA 98072 Rick Bumstead Const. Jamie Schroeder Seattle KC Health Dept. 11980 NE 24th St.,Ste 204 733-7th Ave.,Ste. 100 14350 SE Eastgate Way Bellewe WA 98t�5 Kirkland WA 98033 $ellewe WA 9800'7 Mack Shultz Gregg Zimmerman Steve Bottheim 12249- 147th Ave.SE City of Renton . DDES-LUSD Renton WA 98059 1 Q55 S Grady Way MS OAK-DE-0100 Renton WA 9805'7 Kim Claussen Lisa Dinsmore Nick Gillen DDES-LUSD DDES-LUSD DDES-LUSD MS OAK•DE-0100 MS OAK-DE-014Q MS OAK-DE-0100 Kristen Langley Steve Townsend Larry West DDES-LUSD DDES-LUSD DDES-LUSD MS OAK-DE-0100 MS OAK-DE-0104 MS OAK-D�-0100 Kelly Whiting Bruce Whittaker DOT-Rd Svcs DDES-LUSD MS KSC-TR-0231 MS DAK-DE-0100 � EMAILED to all County s[aff fisted as parties of record/interested persons and primary parties with e-mail addresses on recvrd. I:t}il'l)OIU [)cL�nc� I':u•k ' 0 deposiled �vidi the lJnited Statec Postal Srr�-ice, �vitfi sufficient posta2e, as 1=[fZS�I�CLASS MAIi, in an en�•elope addressed ta dse non-County employec partics of�rccord/in[crested persans at the addresses indicated on tiic list a[t�zched to the ori�inal Certificate ofService. � se»t via Coimty 1NTFROFFfCE 1�1�1L to County staff o�t the list attachccl to the oi•iginal Certificate of Servic;e. DEITED January 6, 2009. � i ,�. , -- �'. - -- ' �`-----�t`--....�-�--�,.��—._-� Ginger Ohnnundt L.egislative Secretary /�ao L07P00I0 RPT CRT uerU:�tr � ..;:K �.:uc.i�v.>>vtl .,,�.,,.,��., ...,... ...�..,�.. ..::��... SECTION 3 — OFF-SITE ANALYSIS TASK 1 - STUDY AREA DEFINITION AND MAPS The proposed project site is located at 12019 148�'Avenue SE in Renton, Washington. More generally, the site is located in the NE �/a of the SE '/a of Section 10 of Township 23 North, Range 5 East, in King County, Washington (see Figure below). It is in the Cedar River / Lake Washington Watershed, May Creek Basin, and has a total area of 8.81 acres with a net developable area of 4.68 qcres. �_- 4 L _ - _ �1 i � r — __. � } .,��t �1.T t '—I I�"- � � �` � �t —' - _ _ � ,-; -' ,� ; �_ � � _. �� 1�.�. - � -- �f, -- i 7.; ) �� - � .� ,., �, .r. �� - -- _ - —, _ _ _ , � � �.. � ; ��_ -� _ ,_, _ � , T .+� _, � _. _--_._ �� I=p��`�'� ��,f�- ,� � _-` ;� ; ��T_�1 i=- � , T k _ . � �--� .� .� � �r �� . �_ �� - — , . f�� ri �.L, ` - - -- _,.. � �� - -��i _ � 1J i - 1 � .-_ 11_"�. � i�-�� i7.� .� � _ � � ; .�y"� - ��-� �_ ' �� _ _ - � __ ---- - __._ - t � t - _ __ � _ � � -�_�'�_= �r:�� ,_ � :��, �� _ _ � � � _ � �� ` C ,� � �� =r Et T..t.t � >,�� i ' �. � 1 L -��> ti �t� .7 �-1�� y 'j�-� ;-_ — ' ��' f -^—'� f �., M� +� _ -5 T �� y � r`� �� ( t ��.�"'i.L �.� .,,'� ---- ----- � � i �:� `�;,� .� �r= .t_�; � -- - I ----- �� . " � �: - � : { :. • �� :� � - F� v `�. ��`L",' � i.- {� _ i r � i��-� . �� '`�1 ��. � '_" __ ._._ . TT ..L'. b �..Y` ({ __,.._.... T�..j ��;� . � =y � y :�,� -.�' ..� r� ,� - :. ---+4 f .-.sz. �� r T J" � . �-r ��.,�I ��. -. '. _.v, r j ��, i(, � �.T� �� ,� - � ��.�� _ T 1�I. F _� ,,.� _-- � � � __ r^ r i�.G i=. I i:, � ,:;� ;-r f��, , �� _, ,_._..� �� _ � �� : I � — -I ,i.r��;~ 1 -.._..— ..} {— 7 �.�".,i : ' ;�L� - , -e -� I �.} `�-� , e ' ; I .._I �,C�t _��_}� -�T'', 1� ��T'� `` � . � ._ _� } � � . , ! : i' ; ,�..f� r,�._ _ C i. _ �. � �...i �Y �� '�.. �__ _ � (.��.._� i, � �-� ��r,; _. � .._ -� .�,i r---- , . r -. . __:- _ . .-, � I _ -- - __ � �. �_.,=1 E-�—� � ' �—;�-r--�—� � , - . _� _; _ __._ � J�'`_' _ �� -�a��- - - r � f{� -��_ , _ �, _.� _�. , __� � 1 r�. � w-� _� �� -�, � '� S` - l '� . _ l � _ + -_ --I � - �y �� r� �--� �-�r £ � '-- _ _ — T . _. -� ___ l ..�TTr ' �'�� '_�t � `—, � � 1 r�?,�. :�� ,�� _ 1 � , i . �:1� ��, �,.T: f 7 ��. ' : i .l 't t __ ..; --- .�.. � .:: ti � � , �.1�i- � L i` � � �'t� - ,_ `` ,-.}� _- � ��r.� _ ,, ;,,:'� �^=�1 NOT TO SCALE , ; , : -'-� ._-- . _,1< r ;,_�_f __ _ ,_.�:1.' "—, �r_�, ,_� _, Vicinity Map Existing Site Conditions The soils on the site are characterized as AgC,AgD (Alderwood till) series soils per the Natural Resources Conservation Service Soil Survey for King County (see Site Soils Conditrons figure below). ' The total site area consists of 6 separate parcels (KC parcel Nos.: 1023059350, 1023059368, 1023059391, 1023059189, 1023059346 and 1023059345}. There are 4 existing single-family residences, garages, barns and other various out buildings currently located on the site (see Figure 3, Existing Site Conditions). The remaining ground cover in the developed portion of the project consists of pasture or residential landscaped areas. All existing development occurs on the eastern half of the project site, as the western half of the project site has four delineated wetlands and associated buffers. The existing topography falls westerly at slopes between 5 and 20% on the eastern half of the site. The existing drainage basin is generally contained within the lot boundaries flowing parallel with the east/west property boundaries. CPH Project No.001 1-OS-006 May 12,2009 CP I H CONSULTAfVTS Page 5 Deloney Park Subdivision Technical Information Report � 5��.il� '_ �` ��'(p __ �s�,9 " „ ;_ ` - : rj11N ( _ Sti ��9 '- ^ _ _ _ .. ___ _? ._ �, _ � , , , .� , � - _ _ . ; � �, . _ � �p f�� .. `_ �. � 3 � i t ] � 1-�H i . ^ T � tl.. '-� i . . y' 1r„ i._ �-+ __ __ \\.. - . . �� ' � ' � �� .. - y - � .Z {� _ _ . ...__ _.. _ . _f t l `"' L ._I ' ` ��j{� ..��' __ . F �I .. . pk� . �. � _� �� i " .'. -:c (( �{:� T' T,.._ -- c� ._.:.. v. � , �+�{.s ��. �::_ �T � { , '"1 t.��e - JL iS6 ._ - I � , �. ' � ._ � � _ _ ..____ ,- iT -- ._ '_T�';i , E �.�.,� i -� -- -� Ttt�Y � , __ ' ; . _.� , : ;) � _ .. ..� __ _ , �., , , !.__ __ _ JFC r _ � . ... � __ _ _ : �, � . � , r -,- , :.� -,T _ ' _ _ _ - � � - . - _ � � � - , _. , .: , � , , , � � `; � _ ___ - - r . . ,� o __.._� _ , t � t� . ;, ,. } z __ � _ _.. __ . , - ; � .v� � .:. iY.._ � . � I .� � __'x . i '� � .�:_.:: •� . _... . : ...��.... _ -F .. 2 . ; - ❑ '-1 _- . ' 4 � . . 1 ... j h -_ �� ' ... ��.. ... .�_ � - _..... � 4 ; _ �;.. � -;_ AgB ,^ _ _ i _ _ _. .:. �. . .... _ �t. `-1 _ w Q = �' �; =r � — �_ �` (� } /--�� -._ � � , . ` �. ` � ` , . �� _ ' - __ __ _- ° -} �Bh�.' ; __ _. . � _ - ._ ..::. ��r i 4�4� _ M,.iC} •r y) i �� i �:�., : I I : � :�. i�. k� _ _ . f+' r� r ._._ _ . _ ... t'' _ �� i g� I _ �t,'""7: .,i _ . j _.. � ' Y '_�� } , , ' r ^� f ' ' � _ � _ _ .�L � � ��' .�� /� .; _ r � � . ' � . . � :�.; _. _ . , _. - � `;' - NE�TH:ST, .�'. �� ` '�,\ __ _. � - f , P _;_. ` ` — ,_. ; , J _. : __ hor ro scacE Site Soils Conditions Developed Site Conditions The project proposes to subdivide the parcels into 27 single-family residential lots, with all the existing residences and other structures to be demolished (see Figure 5, Developed Site Conditions).The storm water runoff generated by new impervious surfaces will be collected by a series of catch basins connected by underground pipes that flow westerly along the proposed subaccess street. The runoff will be conveyed to an on-site combined detention and water quality vault. The natural discharge area will be maintained with the developed conditions. CPH Project No.001 1-08-006 May 1 2, 2009 CP I H CONSULTANTS Page 6 Delaney Pork Subdivision Technical Information Report TASK 2 - RESOURCE REVIEW The western half of the site is identified as wetland according to available King County GIS information.A Wetland and Wildlife Assessment Report was prepared by Raedeke Associates, Inc. (dated luly 19, 2007) supports these findings, see Section 6.1. No other on-site sensitive areas are identified by available resources. There were no drainage complaints directly related to the proposed site, but some complaints refer to the surrounding properties.A list of these complaints is provided in Section 3.1. The site is not located in a 100 year floodplain, is not identified as an erosion hazard area, and it is not in a landslide hazard area. Mitigation of existing and potential problems is discussed in Task 5 of this report. CPH Project No.0011-08-006 May 1 2, 2009 CP�H CONSULTAMT Page 7 ` I Delaney Pork Subdivision Technical Information Report TASK 3 - FIELD INSPECTION A field inspection was performed on Monday, April 10"', 2006, on a clear, dry day with a temperature of approximately 55 degrees and December 7"', 2007, on an overcast day with a temperature of approximately 41 degrees. Below are the descriptions of the onsite, downstream and upstream drainage basins. Onsite Drainage Basins The existing topography of the site has slopes ranging from 0 to 25 percent, generally tending east to west. The property is comprised of two basins (A and B) that drain westerly then northerly. Basin A, approximately 3.3 acres, located on the western portion of the site is comprised of the majority of the proposed Sensitive Area Tract. The topography of this basin slopes generally from southeast to northwest at 0.5- 1.0 percent. The existing vegetation is pasture, wetlands and random clumps of deciduous and evergreen trees. Runoff from Basin A flows west into wetlands A,then north into Wetland B (see point A2 on the Downstream Exhibit) and continues north off site. Basin B is comprised of the eastern 5.5 acres of the site including Wetland C. The topography of his basin slopes generally from east to west from 0 to 20 percent. Existing ground cover consists of lawn, pasture, few trees, several existing homes with associated driveways and various out buildings. Runoff from Basin B flows into west into Wetland C then north off site. (See downstream discussion below). Upstream Drainage Basin Single-family residential developments exist to the south, west and east of the property.The properties directly west of the project site are currently under construction. A single-family residential development is proposed to the north and is currently in process at King County. The storm water runoff systems for the surrounding developments appear to be in place and functioning properly. Basin A's upstream connection to the site is located at point A1 on the Downstream Exhibit. A twelve- inch and six-inch corrugated metal pipes connect the existing wetland located on the Shamrock Heights subdivision to Wetland A on this site. This offsite wetland is considered one of the headwaters for Honey Dew Creek (Honey Creek). Runoff contributions to Basin B from upstream properties are limited due to the existing topography of the property and the drainage system along 148'� Avenue SE. Downstream Drainage Basin Basin A Please refer to the Downstream Exhibit located in Appendix A for clarification. Basin A is conveyed from the site at point A3 via shallow concentrated flow. This is a continuation of the onsite Wetland B to the offsite Wetland A on the East Renton proposed plat. The drainage course consists of a � vegetated water way of approximately 200 feet with slow flowing and standing water present. Drainage then flows through an eighteen-inch corrugated metal pipe at A4. The wetland continues to convey water in a northerly direction for approximately 400 feet (A5) in a thickly vegetated drainage course. A twelve-inch corrugated metal pipe (Ab� is located at this point. The stream/wetland changes direction at the north end of this culvert from northerly to easterly (A7) for approximately 180 feet, then merges with the drainage from Basin B (A8�B2). Once the two flows combine,the direction of flow is once again directed towards the north within Wetland F of the E. Renton/ Rosemont proposed plat (A9/B3). This area is thickly vegetated with trees,grasses, and blackberry bushes. Approximately 1,510 feet north of the proposed site, Wetland F flows into a thirty-six inch corrugated polyethylene pipe (Al 0�B4). This point of Honey Creek is the �/a mile point. Honey Creek continues to flow north and west until it combines with May Creek and eventually discharges into Lake Washington approximately six miles to the northwest. CPH Project No.001 1-08-006 May 12, 2009 CP I H CONSULTAM-S Page 8 Delaney Park Subdivision Technicaf Information Report Basin B Basin B, comprised of the eastern 5.5 acres of the proposed site includes Wetland C. Wetland C conveys water to the north at B 1 where it is connected to Wetland C on the East Renton/ Rosemonte proposed plat. This drainpge channel consists of shallow concentrated flow within a forested wetland. Approximately 650 feet north of the property line, a twelve-inch corrugated metal pipe connects Basin B with Basin A (B2/A8). Please see the above paragraph for the remainder of the combined drainage course to the �/a mile mark. � CPH Project No.001 1-08-006 May 12, 2009 CP�H CONSULTANTS Page 9 Delaney Park Subdivision Technicvl Inforrriatron Reporf TASK 4 - DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCR[PTIONS Tf12 pI"Opv52C� StOfiTi v�Gt2f CGi��i:t,0(i, C.Gf1V2�Cl1C2� uila v.GtC�f :.iuu�lty ;y'yiE]fTl; ;Uj:��vl�iliiCJ.' ifli; �:ifO�eCi r... be in accordance with the provisions of the King County Surface Water Design Manual. The project is required to adhere to conservation flow control standards and basic water quality standards. Roof runoff and surface water generated by portions of the landscaped areas of the proposed development will drain toward an improved roadway that runs east-west through the center of the property where it will be collected by a series of catch basins.A series of underground pipes that connect the catch basins will convey the runoff westerly to an on-site combined detention and water quality vault, after which the runoff will be discharged to the buffer at the eastern boundary of the on- site wetlands. The proposed on-site detention and water quality vault was sized using the King County Runoff Time Series program (KCRTS). Historic site (i.e., fully forested) conditions were considered in the analysis of the pre-developed conditions for all on-site targeted developed surfaces in accordance with KCSWDM standards for Conservation Flow Control.The portion of 148"' Avenue SE which contributes runoff to the proposed system was considered to be impervious in both the existing and developed conditions since it was constructed prior to January 8, 2001 and is not considered to be new or replaced impervious surface. CPH Project No.001 1-08-006 May 12,2009 CP�H CONSULTANTS Page 10 Deloney Park Subdivision Technical Information Report TASK 5 — MITIGATION OF EXISTING OR POTENTIAL PROBLEMS The Off-site Analysis Table provided in Section 3.3 lists the components of the downstream drainage system and conditions of each individual reach. Development of the proposed site will be in accordance with current King County Stpndards. The proposed storm water collection, conveyance, and water quality systems will provide adequate measures to collect, convey, detain and treat increased surface water runoff and mitigate potential downstream systems. Severe erosion problems will be avoided with the conveyance system design.This system is designed to contain runoff rates generated by a 100 year storm event. Potential erosion or other impacts to the on- site wetlands will be further protected with the conveyance of runoff generated by roofs and portions of on-site landscape areas to the improved roadway. Since the storm water will be conveyed underground, detained and released from the on-site vault at a controlled rate, potential erosion or damage to the on-site wetlands will be mitigated. Potential flooding problems will be mitigated by the capacity of the conveyance system.The storm water runoff will be discharged to the on-site wetlands buffer, further decreasing the possibility of overflow due to back watering. Temporary Erosion and Sedimentation Control (TESC) measures will be installed during the construction phase to further mitigate any erosion problems. These measures will be continually monitored and maintained in accordance to King County Standards. Multiple drainage complaints are listpd for the properties surrounding the subject parcel. None of these complaints appear to result from or affect the on-site and downstream drainage features.A summary of the complqints that have occurred within the last ten years are given in Appendix B of this report and are summarized below. TASK 5.1 — Drainage Complaints within 1 mile radius A list of complaints has been compiled within a one mile radius of the site. All complaints were inserted into a spread sheet and sorted by date. Per the King County Surface Water Design Manual, drainage complaints that are more than ten years old are not required for the Level 1 downstream analysis. 102 complaints remained on the list within the last ten years. The list was then culled to the complaints that could potentially be affected by or affect the site's drainage leaving eleven complaints to investigate by requesting the information from the Water and Land Resources Division, Storm Water Services Section (Cindy Torkelson). Two of the complaints (2003-0837 and 2004-0162) are still open pertaining to water quality review and water quality enforcement respectively, thus are not available for review. All complaints reviewed have been categorized under the following system: (please see page 1-22 of the 2005 KCSWDM for definitions) Level 1 —Conveyance System Nuisance Problem Level 2 —Severe Erosion Problem Level 3 — Severe flooding Problem 1. Complaint #1999-0151 (Level 1). The complaint was about nuisance flows through the horse pasture. The investigator found that an existing wetland�pond overflows into this property as CPH Project No.0011-08-006 May 1 2, 2009 CP I H CONSULTANTS Page 1 1 Delaney Park Subdivision Technical Information Report a natural drainage path. The property owner wished to channel the flows to decrease the impact area. This parcel is now within the Plat of Wedgewood Division 4 and is assumed to have been resolved. 2. Complaint #2000-0473 (Level 1). The property owner complains of stormwater being diverted onto her property due to new construction next door. It appeared that the neighbor had an agreement with the school district to exchange access for gravel. The investigator referred the problem to DDES and considered it a private matte - -�-" - - - initiated on 8/7/2000 and closed on 8/31/2000. This parcel is up gradient to 148"' Ave SE ar proposed subdivisions frontage improvemen 3. Complaint #2000-0528—no problem- conversion or con��merc�a� property ro re��aentiai ren�c drainage facility from King County Inventory. 4. Comptaint #2001-0027 (Level 1). Same property owner as complaint #2000-0473. Additio� neighbor `dumping water' onto her property. WLRD deemed this to be a continued privc issue and referred property owner to DDES. This parcel is up gradient to 148"'Ave SE and not impacted by potential runoff from the proposed subdivisions frontage improvements. 5. Complaint #2003-0252 (Level 1) The property owner stated that recent development within the City of Renton causes flooding on his property. Both King County and City personnel observed `wet site indicator plants' on this property prior to the recent development and after. King County reviewer provided information to the property owner for keeping improvements and debris out of the lowest are of the property to limit flood levels. This parcel is west and up gradient of the proposed project and stream corridor thus not impaded by potential runoff from the subdivision. b. Complaint #2003-0567 (Level 1} The property owner requested assistance for the water that seeps into their basement. KCWLRD provided the homeowner with information on footing drains. This parcel is up gradient of the wetland/stream corridor by approximately 55 feet vertical and up gradient of the sag curve within 148't'Ave SE by approximately 15 feet vertical according to IMAP. The proposed project will not impact this parcel by storm discharge from the proposed detention facility nor the frontage improvements. 7. Complaints #2003-0702 (Level 1) The property owner complains of flooding from right of way conveyance. This occurred during a rain event on 10/20/03 at a time of heavy construction upgrading the storm system in the road. This parcel is west and up gradient of the wetland/stream corridor to the west of the site. In addition, a ridge lies between the stream corridor and the complainant thus the,proposed project will not impact this parcel. 8. Complpint #2006-0515 (Level 1) The property owner complains of stormwater overtopping catch basins and flooding his garage. This parcel is south of new construction for the Shamrock subdivision. According to the engineer on record, a design change was initiated to change the catch basin grate to a through curb inlet, add a driveway drop and an additional catch basin to intercept flows. The proposed subdivision does have frontage improvements that could be tributary to CPH Project No.001 1-08-006 May 1 2,2009 CP I H CONSULTANTS Page 1 2 Deloney Park Subdivision 7echnical Information Report this parcel, however,there are several inlets between the new subdivision and the complainants property. It is not anticipated that the proposed project will impact this property. CPH Project No.001 1-OS-006 May 12,2009 CP�H CONSULTANTS Page 13 CP H CONSULTANTS SECTION 3. 1 DRAINAGE COMPLAINTS Site Planning [ivil Engineering Project Monagement Land Derelopment Consulting ar�c �Berg-G cek reliminary Subdivision �� - - _ � . � � _ Z � �, 4�� _ j; � _ f `�? ' �� ' '�i ' - - i I � _-- O. ' 7�`J2lC��939J = _ f - `�6381'_��_. . � } i� --, ,*l+,�f ,� ;i . :i�—" _ J � �+ j. r� _ - i' ' �' �,' i .- ~, 1�- _•'�"++"�_-_ - - _— �_ 505_- � - ,y,� I --., � �;! ,' � ��if I,JI � � �,'' f! -_ a, � � _ _ 4� ! �1lr�Syr�' �,yi �f� ';'_ ,i�! ! .��r� �t,�p � Obt�?'_�Oc�9 .t'i�Kf�AL'� ! - _ ! _ ,��s �� } ri �'� `, - � ' - - -- i �,y` �' II� I ' I t ,, � '� � ''� `s i t�`, � � ; � ' ~ ', �' =- -'- -` -� "'- - - I _ 4 � ,�� '��' f � : F _ t� i f �i f ' � :,�a.p� � �. �� i�� - ( , �n13G54!13--, � i._./ ;oi . ,� �� II €ti 'I ��.I � � t_ -_— _ . t '�o ' .'' ' I ,{ j � ;�I I __-_ —_I_- - .� _I +4 J I I� ' I 5 �; �i �'� � � � ��. 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'S � _ �i3 �i69D��, y ' J v 1 � � "G � �.'1:30S9061�.y. � i,_�_i•,�:i.�.. :�itl��JGBJJ.� !.'J81J76f�1 �6�f:0$lyJylU..-d,TO r itn� i M1 , � 1lt � � ��+ t � I .Jd20(1G27 :J:1610��YlJ�� 1 � � � �1 ti �� l_ . ::0$10��6/�� 1 �� t/OSl'UJlU I,0 I� 0 1!?6800'<'�� '081U0�0//��1JU630. i y� ;!pg ru�9f0.__ t ti -} q, I i I . i.�.�ir�g.�n y I � I,y ri'i`�5�_i?6� I t � -'t , �.�,��.� �, - i - � q . �i✓ i�u,�r � . . � ��i� ....._ - �Y�, ,� i.t ��i�i.�, t_r�ui _ ;CI 2K105K�ag CountY i 12ST>�5T :r'�� 0 280f� , Le ge nd �_� Caunry Boundary �J Incorpo�ated Area �; Lakes and Large Rivers �� Mountain Peaks Streets , Streams Contours [5ft dark) �{,�h,,,�„ ./ 100:500:1000 Ancrw�z �'Y a ncr �o�cai Highways Parcels The informatlon inGuded on tFds map has been mmpded by King Counry staft from a vanety of sources and is subject to c�ange without notice.King County mekes no representations or wartanties,express or implied,as to accuracy,completeness,Gmeliness,a rights to fhe use ot such infamaUo�. This documenl is not intended for use as a survey pnducl.King Counry shall ral be IiaDla for any ge�.special,indirect a�cidenfal,a consequential a damages i�dudng,but not Gmited to,lost revem�es a bsl profrts resufting from the use or misuse of the intortnetion conlained on Viis map.My sab oi King County thi9 map a infamatio�on this map is prohiDiled e:cept by written permissan of Klrg County. Date:4/aJ2007 Swrce:King County iMAP-SensNve Areas(http:/Mnvw.metrokc.gov/G1S(iMAP) Fi9v.r� 5: S'►�2.To(�ogro.�lhr� iMAP ' `� NewcastlMe v_lrr•,a_ `��,. � � __ ,� a I r �, 4 tiE 25T�i a_ ± ?�`' "`1� r �W. 1 tiE ZT��ST SE t�]p7��o_ � `lI. ff v_ VL2:lR�p'L � ( , 'T . � .K � �- --� _-_ � '� V�22�10 ST e 'vE I2Ni7 PL NE�,c,;- , '`4'y s� :u � � 1 :�' d'j �9 z Z VE XIT�.D: 1.l5-�"�Ct�L .L� L � L Q � � R` � `--� �r y�! NE 19T��ST -a i � � = y ' F� � � �S g n v `•a �O t Z � T. _ r�,�r�,sr �Q q rl, F � y) r1 LL z � s - '�'E' �., n - 'St{.y_ T -'_ __-- n' •� s�cT�� } �� -'' �`� �t � �; �- < '� _ '1 rit •�tH 5r $ a , � �t�asr�r.�r � W� � SF 112TM�: ��1?TM Sj :r: R� �..'mav��Y � = til0 ,Y�, '� � � SE 1 t]TN� �Y�� t W � ' .. � yC t t7��5T � I �I1fTM$7 Q(/,� - y � NE 1QTr�='_ �`- 3 � 'P{�i q T ' I' I > z " � � � *rE�or�,sr SE i1QTM$T T T - � C' � ��, � "' Vf9'TNST •1=9T,�� r� �r J� . �;1 � �� ttdT��-•. C 3• I � � Renton - a � a `� �� y V_]TH ST � � � - � ~ �• 3�, 7� y `�E 1T��yT_ � 'r ' C.'iq ST � l }E''�'S7S7 } ::T�,.yr SE_�h]Tr�_ST ��':._ < Z 4E TTH ST ' J TE VE�a! ` � ,'g T � 3 ,,� - r v-3T��a NEgTMGS '' I , '4' �123R05T `J` `� - �'� M£8TM ST � S[t�eT��ST �r 'd—Q f '``�.�� _� kE STN� _ - ` NE STM ST tiE gTN ST �� _Q�". �., � R �ti i ' � ^ HE STN ST " Q � � �°J� y�<T�1� ! �, � W I�� NE dTN oL yE=j'+°- � 7 � _ � NE atM st sE-�ZSFF{sf�.�-.� W W � <= Ol � i V_lR�_T p ` �I �fE�t0 ST� � . � C., ' tiE2Y��: � z � � � � x- y �'',�� r��c� �sE�sbro sr �r�aro sr n sF��zvc sT : � � y�?, � D V�>;T?_ �� VE tST CiR SE�]]Rf'.ST � �+� SE tST p� ', ♦ NE 1ST S7 ,u 1ST a. �9 SE 1]�TN ST �� n ��ST � SE 1�M ST 'L SE 7M0 R SE t N ST ti �ZND�T 4 �' � Q SE 1]BT��ST � 31�� S � �' �:: i�= SE t l7T�t vl SE t�N 7gt `� S c � � Sk;tN �' � � . � _ �=SE t]BTM PL -___.,.,,,, � .- '�Ip __— � 9E 1]9TN PL !�t]9TM ST ---- � ��444 � � _ - - ,, �US� � < � �� 1� <�I�tST�t - - SF t�p ST � Z � 2 � ,� �� 'E a2Nt)p� � d ��rx--� _ � � � � � '� SE 1.9dTN ST `� � - 'E'`15TN .S'F �.WjH SE �94TH Si :CI 1005 King CouMy.. �F. � Q �1850n �'� I'ST��ST COMMENTS:1 mile Drairx,�e Complaints The inlormaGon incMided on this map ha�been cart�piled bY Kin9 Cou�y slaft from a variety o1 sources a�d is wbject to change wiUio�rt natice.Kng Courriy makes ro representabona or wartanties,e�ress a mpied.as W accura�y,cornpleteness.tMneliness,or righrs ro Ne use d wch mfortnetion. This document is not nterWed ior use as a survey product Counry shap not De Yable tor any general,specia�,indxect.ncidental,a consequential � • damages indudng.bul na!IimRed Do.bat revenues or bst��a��«��o.�,,,�� King County his m�a information on this mep is pohibited except DY'Nritten DB^niasan d King Caunry- Cate:12,7l2007 Source:Kmg Counry iMAP-Stomrwater(httpJhvwwmetrolcc.govlGI�MAPI SEP. 14. 2007 9: 33AM KIN� CO3 WLRD N0. 6772 P• � Fage 1 of I TQrl�elson, Cindy m: Rebe�cca Cushman [rebecca(�cphconsultants.com] �ent: Thursday, September 13,2007 11:24 AM 'Co: Torkelson, Cindy Cc: Jamie Schroeder Su6ject: Drainage Gomplainfs Gbod morning Cindy, It has been quite some time since I have last spoken to you. I am now working at CPH consultants. I have a list af drainage complaints that I was hoping you could pull and either email or fax them to me. 1999-0151 2p03-0252 ' 20U3-0567 - ' �,. n�",. 2003-0702 _ �nn � �Q� (� .�� /�`'• _ 20a3-0837 f�� 200�-0'162 '- � �"'� 2006-0515 Please let ms know if there are any issues about gettmg these campiains. Thanks! R�becca REB�OCArCU57rIlVIAN,P� �� a�,crMnxnGEx 733 7ih Avemie,Svito 100 � Kirkland,WA 98033 ��L,�,��,�� main:A25.285.2390 � fo�425285.2389 diroci:425.265.2397 � wwvixpFxonsukantscaro I Rec COMP NO PROBLEM TYPE RECD CLOSED ADDRESS PARCEL COMMENTS � e an 16:00:00 PST 1997-0055 FLDG C 1997 Sun Jan 12 16:00:00 PST 1997 SE 14105 133RD ST 6928000210 PUGET COLONY HOMES 2 e an 16:00:00 PST 1997-0055 FLDG NDA 1997 Wed May 7 17:00:00 PDT 1997 SE 14105 133RD ST 6928000210 PUGET COLONY HOMES 3 un an 16:00:00 PST Wed Jan 29 16:00:00 PST 1997-0055 FLDG R 1997 1997 SE 14105 133RD ST 6928000210 PUGET COLONY HOMES 4 e an 16:00:00 PST 13215 154TH AVE 1997-0056 DITCH C 1997 Sun Jan 12 16:00:00 PST 1997 SE 1463400005 5 un an 16:00:00 PST 13215 154TH AVE 1997-0056 DITCH R 1997 Tue Apr 22 17:00:00 PDT 1997 SE 1463400005 g e pr 17:00:00 PDT TREE DAMAGED FENCE ROADS 1997-0715 R/D FENC FCR 1997 Thu Apr 17 17:00:00 PDT 1997 SE 13845 131ST ST 1523059223 FACILITY 7 ue ct 17:00:00 PDT SE 15329 MAY PVT DRIVE CONST IMP TO RD DRNG 1997-1299 DRAINAGE E 1997 Sun Dec 31 16:00:00 PST 1899 VAILEY RD 223059005 SYS g ue ug 77:00:00 PDT SE 15329 MAY PVT DRIVE CONST IMP TO RD DRNG 1997-1299 DRAINAGE C 1997 Mon Sep 8 17:00:00 PDT 1997 VALLEY RD 223059005 SYS g on ep 17:00:00 PDT SE 15329 MAY PVT DRIVE CONST IMP TO RD DRNG 1997-1299 DRAINAGE R 1997 Tue Oct 7 17:00:00 PDT 1997 VALLEY RD 223059005 SYS 10 ue ep 17:00:00 PDT LOCALIZED DEPRESSION PUGET 1997-1378 DRAINAGE C 1997 Tue Sep 30 17:00:00 PDT 1997 SE 14004 133RD ST 6928000160 COLONY HOMES 1� ue ep 17:00:00 PDT Wed Jun 17 17:00:00 PDT LOCALIZED DEPRESSION PUGET 1997-1378 DRAINAGE R 1997 1998 SE 14004 133RD ST 6928000160 COLONY HOMES 12 ue ep 17:00:00 PDT LOCALIZED DEPRESSION PUGET 1997-1380 DRAINAGE C 1997 Tue Sep 30 17:00:00 PDT 1997 SE 14005 133RD ST 6928000170 COLONY HOMES �3 ue ec 16:00:00 PST Wed Sep 29 17:00:00 PDT 1997-1625 BMP'S WQA 1997 2004 SE 14413 128TH ST 847100016 WANTS TO BE A BCW MEMBER �4 ue an 16:00:00 PST INLET AND REST PLUGGED WITH 1998-0050 OVERFLOW FCR 1998 Thu Feb 5 16:00:00 PST 1998 SE 13800 118TH ST 1437650240 DEBRIS 15 un ar 16:00:00 PST 13115 158TH AVE PVT PROPERTY IMPACT DUE TO NTRL 1998-0152 DRAINAGE C 1998 Sun Mar 22 17:00:00 PDT 1998 SE 3664500215 DRNG 16 u aY �I 17:00:00 PDT Thu May 28 17:00:00 PDT APPEARS PRE GRADING ACTIVITY NO , 1998-0360 DRAINAGE C 1998 1998 SE 14454 132ND ST 847100054 PERMIT I 17 �, Sun Jul 5 17:00:00 CHAIN CUT AT BOLLARDS YARD ' 1998-0456 ROAD FCR PDT 1998 Tue Jul 21 17:00:00 PDT 1998 SE 16400 128TH ST 1656600290 WASTE IN PON 18 on ug 17:00:00 PDT Wed Dec 19 16:00:00 PST 13224 144TH AVE DISCHARGENEW RESIDENT NO ILLICIT 1998-0534 WQI WQR 1998 2001 SE 847100073 HOOKUP �g un ug 17:00:00 PDT Wed Dec 19 16:00:00 PST 13224 144TH AVE 1998-0534 WASHWATE WQC 1998 2001 SE 847100073 APPARENT GREY WATER DISCHARGE 20 ue an 16:00:00 PST 1999-0015 DRAINAGE R 1999 Tue Mar 2 16:00:00 PST 1999 SE 14013 133RD ST 6928000180 21 e an 16:00:00 PST Wed Feb 10 16:00:00 PST 1999-0038 EROSION C 1999 1999 SE 16043 125TH ST 1656600160 EROSION AT BACK OF SIDEWALK 22 e pr 17:00:00 PDT 1999-0038 EROSION NDA 1999 Sat Apr 24 17:00:00 PDT 1999 SE 16043 125TH ST 1656600160 EROSION AT BACK OF SIDEWALK P3 e e 16:00:00 PST Wed Apr 14 17:00:00 PDT 1999-0038 EROSION R 1999 1999 SE 16043 125TH ST 1656600180 EROSION AT BACK OF SIDEWALK 2q un e 16:00:00 PST 11624 142ND AVE INTERMITTEN STREAM CHANNELIZE 1999-0151 DRAINAGE C 1999 Mon Mar 8 16:00:00 PST 1999 SE 1023059092 INFO 28 un ar 16:00:00 PST Mon Jun 14 17:00:00 PDT 1999-0202 DRAINAGE CL 1999 1999 SE 14004 133RD ST 6928000160 RECORD OF INQUIRY ONLY-NO CLAIM z6 on pr 17:00:00 PDT Thu May 27 17:00:00 PDT SE 120-124 Q QUEST RE DRAINAGE EASEMENT& 1999-0334 DRAINAGE C 1999 1999 156TH SE 1123059072 HISTORY 27 Thu Jul 8 17:00:00 11900 138TH AVE ROADS REQUEST FOR WA TO 1999-0519 MAINT FCR PDT 1999 Thu Jul 29 17:00:00 PDT 1999 SE 1437650270 ADDRESS MAINT 28 on ug 17:00:00 PDT CONCERNS RE NEW DEVELP CITY OF 1999-0609 CONSTRUC C 1999 Thu Sep 2 17:00:00 PDT 1999 SE 14606 136TH ST 847100100 RENTON 29 e �9 17:00:00 PDT 128XX 155TH AVE 1999-0636 DRAINAGE C 1999 Tue Oct 12 17:00:00 PDT 1999 SE 1123059072 GRADING VIOLATION OPEN E#9901111 30 e ct 17:00:00 PDT SE 14813 RENTON- CONCERNS REGARDING SEDIMENT 1999-0725 CREEK WQC 1999 Sun Oct 24 17:00:00 PDT 1999 ISS RD 223059018 DRAINAGE 3� u an 16:00:00 PST 10415 147TH AVE LOT CLEARING PREP TO NEW 2000-0026 CLEARING C 2000 Mon Feb 7 16:00:00 PST 2000 SE 1776400020 CONST?? 32 e e 16:00:00 PST 2000-0090 DUMPING C 2000 Fri Feb 18 16:00:00 PST 2000 SE 16043 125TH ST 1656600160 UNAPPROVED USE OF COUNTY TRACT 33 e ar 16:00:00 PST 2000-0151 BOLLARDS FCR 2000 Tue Mar 7 16:00:00 PST 2000 SE 16400 128TH ST 1656600310 DEV INSTALLING PER SUP S-4-97 34 FAUNA IN WETLAND AREA OF REGIONAL FACILITY.NO SIGNIFICANT Sun Apr 23 DEBRIS OR POLLUTION PROBLEM 17:00:00 PDT Wed May 17 17:00:00 PDT IDENTIFIED.OH WHERE OH WHERE 2000-0282 WQO FCS 2000 2000 SE 16400 128TH ST 1656600310 HAVE THE FOGGIES GONE? 35 RAINSTORM TO CHECK FOR EROSION/SEDIMENT DDES IS INVOLVED WITH UPSTREAM Tue Jun 13 DEVELOPMENT AND CCF RESPONSE 17:00:00 PDT 10415 147TH AVE WAS SENT OUT ON 7/19 THROUGH 2000-0440 DES WQR 2000 Sun Dec 31 16:00:00 PST 1899 SE 1776400020 EMAIL 36 un un 17:00:00 PDT 16300 RENTON- 2000-0447 WQO WQR 2000 Sai Mar 17 10:27:40 PDT 2001 ISSAQUAH HWY 1656500015 37 a ar 10:27:40 PDT 16300 RENTON- 2000-0447 WQB WQAP 2001 Sun Dec 31 16:00:00 PST 1899 ISSAQUAH HWY 1656500015 BMP LETTER SENT 2/12/01 38 Mon Jun 26 GRAVELED PARKING AREA.FLOW 17:00:00 PDT 11800 148TH AVE FROM AREA POTENTIAL IMPACT TO 2000-0473 DDM C 2000 Mon Jul 17 17:00:00 PDT 2000 SE 638100180 COMPLAINANTS PROP 39 Tue Jul 25 TO RESIDENTIAL.PAST SWM FEES TO 17:00:00 PDT 11840 148TH AVE BE REFUNDED.REMOVED FACILITY 2000-0528 MMG FCC 2000 Tue Aug 29 17:00:00 PDT 2000 SE 638100210 FROM INVENTORY 40 on ug 17:00:00 PDT SE 14100 132ND NO FIELD INV NECESSARY.REF' 2000-0597 DCA C 2000 Tue Sep 5 17:00:00 PDT 2000 ST' 1523059217 TO SWEES FOR EXSTG CIP 41 e ug 17:00:00 PDT 15744 RENTIN Lots of unattended cars,debris and 2000-0609 WQB WQC 2000 Fri Sep 22 06:01:49 PDT 2000 ISSAQUAH RD 5229900295 possible WQ sources.Will refer for WQA 4p n ep 06:01:49 PDT 15744 RENTIN Lots of unattended cars,debris and 2000-0609 WQB WQR 2000 Sun Dec 31 16:00:00 PST 1899 ISSAQUAH RD 5229900295 possible WQ sources.Will refer for WQA 43 u c 17:00:00 PDT 11912 160TH AVE SYSTEM AND WETLAND.ACTIVE 2000-0712 WQO WQC 2000 Thu Dec 28 16:00:00 PST 2000 SE 638100291 CONSTRUCTION SITE. 44 on ov 03:15:42 PST 11912 160TH AVE SYSTEM AND WETLAND.ACTIVE 2000-0712 WQO R 2000 Thu Dec 28 16:00:00 PST 2000 SE 638100291 CONSTRUCTION SITE. 45 Sun Nov 19 Mrs.Waltrip has mulched all exposed soil 16:00:00 PST Wed Dec 20 16:00:00 PST 11204 148TH to stop erosion.Yard will be landscaped 2000-0760 WQB WQR 2000 2000 AVENUE SE 7206900085 next year during the spring. 46 on ov 18:00:00 PST R/W.NEEDS REPAIR.WHO IS 2000-0763 MNM FCR 2000 Fri Feb 2 16:00:00 PST 2001 SE 14004 133RD ST 6928000160 RESPONSIBLET 47 u an 16:00:00 PST 13400 158TH AVE SEDIMENT,MANAURE DISCHARGE 2001-0015 DDM WQC 2001 Thu Jan 25 16:00:00 PST 2001 SE 3684500260 INTO COUNTY ROADSIDE DITCH. 48 • PREVIOUS INV TO DDES.DDES Wed Jan 10 DETERMINED NO VIOLATION.NO 16:00:00 PST 11800 148TH AVE FLOODING,EROSION.PROBLEM 2001-0027 DDM C 2001 F�i Feb 2 16:00:00 PST 2001 SE 638100180 IDENTIFIED ON COMPL.PROP 4 on an 16:00:00 PST Wed Mar 21 17:00:00 PDT 10415 147TH AVE EMAIL RESPONSE SENT FOR RON 2001-0065 INQ X 2001 2001 SE 1776400020 SIMMS ON FEBRUARY 20,2001 5p u ar prepare ema or ancy ansen o sen 17:00:00 PDT Tue May 15 17:00:00 PDT 10415 147TH to Claudia Donnelly which was sent on 2001-0186 DCA X 2001 2001 AVE147TH AVE SE 1776400020 April 12,2001 51 e aY 17:00:00 PDT BIO SWALE RETRO FIT.CATEGORY 2001-0313 BSR R 2001 Thu Jul 5 77:00:00 PDT 2001 SE 15400 133RD CT 9432750210 CCLOSE TO RETRO FIT STUDY 52 ue ov 16:00:00 PST 13309 146TH AVE 2001-0697 DDM C 2001 Sun Dec 31 16:00:00 PST 1899 SE 847100077 53 Mon Nov 26 POTENTIAL QUICK FIX-WATER FROM 16:00:00 PST 10415 14TTH AVE NEIGHBOR IS FLOWING ACROSS AN 2001-0765 DDM R 2001 Wed Apr 3 17:00:00 PDT 2002 SE 1776400020 UNIMPROVED RIGHT-OF-WAY. 54 Thu Apr 4 POTENTIAL QUICK FIX-WATER FROM 03:04:36 PDT 10415 147TH AVE NEIGHBOR 15 FLOWING ACROSS AN 2001-0765 DDM NDA-Q 2002 Wed Apr 3 17:00:00 PDT 2002 SE 1776400020 UNIMPROVED RIGHT-OF-WAY. 55 ue an 16:00:00 PST 10415 147TH AVE PDR FOR ENFORCEMENT LETTER 01- 2002-0005 DDM C 2002 Wed Jan 9 16:00:00 PST 2002 SE 1776400020 0842. 56 Tue Jan 15 RESPONSE TO 1/9/02 EMAIL FROM 16:00:00 PST 10415 147TH AVE CLAUDIA DONNELLY.DARYL GRIGSBY 2002-0035 INQ X 2002 Sat Feb 23 16:00:00 PST 2002 SE 1776400020 SENT EMAIL RESPONSE ON 2/14/02. 57 e e 16:00:00 PST FENCE DAMAGED BY TREE FALL.TREE 2002-0126 INQ CL 2002 Wed May 8 17:00:00 PDT 2002 SE 14012 133RD ST 6928000150 GROWING IN UNOPENED KC R-O-W. 58 SWM#174:REQUEST TO REMEASURE: EXISTING IMPERV SURFACE 35.4%. Thu Mar 14 REMEASURE DETERMINED REDUCTIO 17:00:00 PDT Mon Aug 12 17:00:00 PDT TO 32.93%.RESULT IS NO CHANGE IN 2002-0214 REM FI 2002 2002 SE 15620 128TH ST 1123059028 RATE STRUCTURE 59 SWM#174:REQUEST TO REMEASURE: EXISTING IMPERV SURFACE 35.4%. Wed May 1 REMEASURE DETERMINED REDUCTIO 08:00:12 PDT TO 32.93%.RESULT IS NO CHANGE iN 2002-0214 REM FIR 2002 Tue Aug 13 01:07:47 PDT 2002 SE 15606 128TH ST 1123059028 RATE STRUCTURE 60 SWM#174:REQUEST TO REMEASURE: EXISTING IMPERV SURFACE 35.4%. Tue Aug 13 REMEASURE DETERMINED REDUCTIO 01:07:47 PDT TO 32.93%.RESULT IS NO CHANGE IN 2002-0214 REM FIH 2O02 Sun Dec 31 16:00:00 PST 1899 SE 15606 128TH ST 1123059028 RATE STRUCTURE 61 un pr 17:00:00 PDT EROSION AND RUTTING CAUSED BY 2002-0287 MMG FCR 2002 Mon Apr 8 17:00:00 PDT 2002 SE 13800 118TH ST 1437650240 VEHICLE USE.WA 16844. 62 e P� 17:00:00 PDT 10415 147TH AVE UNDERSIZED CULVERT CAUSES 2002-0303 DDM R 2002 Thu Apr 18 02:59:12 PDT 2002 SE 1776400020 BACKUP DURING LARGE EVENTS. 63 u pr 02:59:12 PDT 10415 147TH AVE UNDERSIZED CULVERT CAUSES 2002-0303 DDM NDA-F 2002 Sun Dec 31 16:00:00 PST 1899 SE 1776400020 BACKUP DURING LARGE EVENTS. 64 e ug 17:00:00 PDT Mon Aug 12 17:00:00 PDT TANSY INFESTATION WITHIN R/D 2002-0571 MNW FCR 2002 2002 13800 SE 118TH ST 1437650240 TRACT.REFERRED TO DOT 65 on c 17:00:00 PDT 15753 RENTON- 2002-0811 WQD WQE 2002 Sun Dec 31 16:00:00 PST 1899 ISSAQUAH RD 638100031 66 e ar 16:00:00 PST 10415 147TH AVE CONTROL BMP'S ON 2003-0210 INQ X 2003 Thu Mar 20 17:00:00 PDT 2003 SE 1776400020 NEIGHBOR'S PROPERTY. 67 Mon Mar 24 RENTON.DISCHARGE TO HISTORIC 17:00:00 PDT DRAIANGE.COMPLAINANT ALLEDGES 2003-0252 MMF C 2003 Sun Jul 13 17:00:00 PDT 2003 13825 SE 116TH ST 1023059380 PROPERTY IMPACT 68 Mon Apr 21 RENTON.DISCHARGE TO HISTORIC 00:25:07 PDT DRAIANGE.COMPLAINANT ALLEDGES 2003-0252 MMF R 2003 Sun Jul 13 17:00:00 PDT 2003 13825 SE 116TH ST 1023059380 PROPERTY IMPACT 69 Mon Jun 30 138TH AVE SE AND 20 FOOT UTILITY 17:00:00 PDT EASEMENT.WILL REQUIRE DRAINAGE 2003-0429 RVC C 2003 Thu Jul 24 17:00:00 PDT 2003 13604 SE 107TH PL 3450000080 EASEMENT 70 un u 17:00:00 PDT 2003-0485 MNW FCR 2003 Mon Aug 4 17:00:00 PDT 2003 13800 SE 118TH ST 1437650240 71 • Tue Aug 26 GROUNDWATER SOURCE. 17:00:00 PDT 11327 148TH AVE DOWNSPOUTS NOT CONNECT TO 2003-0567 DTA C 2003 Thu Oct 30 17:00:00 PDT 2003 SE 1023059296 DRAINAGE SYSTEM 7p ue ep 17:00:00 PDT NEAR 12033 160TH DETERMINED DUMPING WITHIN ROAD 2003-0633 WQD WQC 2003 Tue Oct 7 17:00:00 PDT 2003 AVE SE 1123059082 R/W.REFERRED TO ROADS ON 9/25l03 73 STORM EVENT:ALLEGED DISCHARGE Tue Oct 21 FROM COMMERCIAL FLOW CONTROL 17:00:00 PDT FACILITY.INVESTIGATION DID NOT 2003-0702 MMF FCC 2003 Tue Dec 23 16:00:00 PST 2003 SE 13611 116TH ST 1023059075 DETREMINE DEFECT 74 DEVELOPMENT ACTIVITY.CONCERN Mon Oct 20 REGARDING DITCHING OF ROADSIDE 17:00:00 PDT DITCH AND DISCHARGE TO HER 2003-0704 DES WQC 2003 Tue Dec 23 16:00:00 PST 2003 SE 15630 124TH ST 1123059072 PROPERTY. 7g u c 17:00:00 PDT Mon Dec 29 16:00:00 PST 12819 160TH AVE 2003-0747 WQAI WQA 2003 2003 SE 3664500320 AUDIT PER MCL REQUIREMENT 7g on ov 16:00:00 PST POND NOT DRAINING.DETERMINED 2003-0821 MNM FCR 2003 Thu Nov 27 16:00:00 PST 2003 SE 13812 121ST 1437850270 RESTRICTION IN ROADSIDE DITCH. 77 e ov �� 16:00:00 PST 11414 137TH AVE 2003-0837 WQDC WQR 2003 Sun Dec 31 16:00:00 PST 1899 SE 1023059332 I 7g ossi e cross-connec ion o sani ary in o ' storm system at SE 116 St,just west of ' 138th Ave SE(Duvall Ave NE). Investigation shows high level of fecal , Tue Feb 24 coliform.Appears recent work by City of � 16:00:00 PST Mon Mar 22 03:36:54 PDT &SE 116TH ST Renton conlractor in area.City of Renton 2004-0162 WQI WQC 2004 2004 138TH AVE SE 1023059434 investigating. 7g ossi e cross-connec ion o sani ary in o �, storm system at SE 116 St,just west of li 138th Ave SE(Duvall Ave NE). Investigation shows high level of fecal I Mon Mar 22 coliform.Appears recent work by City of 03:36:54 PDT &SE 116TH ST Renton contractor in area.City of Renton 2004-0162 WQI WQR 2004 Tue Mar 23 08:29:52 PDT 2004 138TH AVE SE 1023059434 investigating. gp ossi e cross-connec ion o sani ary in o storm system at SE 116 St,just west of 138th Ave SE(Duvall Ave NE). Investigation shows high level of fecal Tue Mar 23 coliform.Appears recent work by City of 08:29:52 PDT 8�SE 116TH ST Renton contractor in area.City of Renton 2004-0162 WQI WQE 2004 Sun Dec 31 16:00:00 PST 1899 138TH AVE SE 1023059434 investigating. g� on ay 17:00:00 PDT &140TH AVE SE SE Inquiry on Puget Colony Homes pipe 2004-0447 DTA I 2004 Sun Mar 12 17:00:00 PDT 2006 132ND ST 1523059067 alignment.Plan faxed 5/26/04 82 Sun Jun 13 IN THE CITY OF RENTON THAT IS 17:00:00 PDT BEING PROPOSED NEXT TO HER 2004-0487 DDM I 2004 Thu Jul 29 17:00:00 PDT 2004 SE 14012 133RD ST 6928000150 PROPERTY. g3 un ug 17:00:00 PDT SE RENTON 2004-0624 WQB WQR 2004 Sun Dec 31 16:00:00 PST 1899 ISSAQUAH RD 323059026 84 ac err es rees encroac ng on property.Investigation/research found Sun Aug 29 complainant property abuts Tract A,which 17:00:00 PDT Mon Sep 20 17:00:00 PDT is owned/maintained by HOA.D92220 not 2004-0651 MNM FCR 2004 2004 SE 16043 125TH ST 1656600160 affecting complainant. 85 , MR.ROBBINS THINKS CLEANING A i DRAINAGE CHANNEL JUST BEHIND HIS Tue Oct 12 NEIGHBOR'S HOUSE KILLED A 17:00:00 PDT Wed Oct 20 17:00:00 PDT 12611 155TH AVE TREE.HE DOES NOT WANT HIS TREES 2004-0787 DTA R 2004 2004 SE 9353300850 DAMAGED IN A SIMILAR MANNER. � 86 u ov � 17:00:00 PDT HOA REQUEST TO INSTALL PRIVATE I, 2004-0855 ACS SUP 2004 Thu Jan 13 16:00:00 PST 2005 SE 15236 136TH LN 3295900600 FENCE AROUND FACILITY. g7 u an 02:42:40 PST HOA REQUEST TO INSTALL PRIVATE 2004-0855 ACS SUPF 2005 Thu Jan 13 16:00:00 PST 2005 SE 15236 136TH LN 3295900600 FENCE AROUND FACILITY. gg on ov I 16:00:00 PST &SE 128TH ST 2004-0941 WQAI WQA 2004 Sun Dec 31 16:00:00 PST 1899 155TH AVE SE 1423059106 gg ota o rea= . cres. o a Thu Jul 22 Impervious Surface=2.71 Acres).Total 17:00:00 PDT Percentage Impervious=31.1%=Rate 2004-0978 REM FI 2004 Sun Feb 13 16:00:00 PST 2005 1340 144TH AVE SE 847100090 Category 4 Moderate gp on ec 16:00:00 PST 8�SE 136TH ST I 2004-0986 WQB WQR 2004 Sun Dec 31 16:00:00 PST 1899 142ND AVE SE 1523059067 city of renton project '! 91 This commercial parcel is currently under Thu Jul 22 construction.Buildings also occupying 17:00:00 PDT SE 16230 RENTON parcel 165650-0025.Need to measure both 2004-0987 REM FI 2004 Sun Feb 13 16:00:00 PST 2005 ISSAQUAH RD 1656500070 parcels when completed. 92 Possible blocked drainage.Investigation Wed Apr 6 found inlet to pipe on W side of 152 Ave SE ' 17:00:00 PDT Wed Apr 20 17:00:00 PDT 8 152ND AVE SE SE plugged.Research found this portion of I 2005-0192 DTA C 2005 2005 132ND ST 9432750210 road within Renton. � 93 ue ay 17:00:00 PDT 12652 155TH AVE Water in crawlspace.Property owner had 2005-0304 DTA C 2005 Thu Jun 23 17:00:00 PDT 2005 SE 9353300760 resolved problem when investigator arrived. 94 e P� 09:04:43 PDT RENTON 2005-0596 UTI SUPF 2007 Sun Dec 31 16:00:00 PST 1899 ISSAQUAH RD 293850370 S-236-05 UTILITY INSTALLATION 95 ue ov 16:00:00 PST 2005-0622 WQB WQR 2005 Sun Dec 31 16:00:00 PST 1899 SE 18135 113TH PL 5231000100 9B or y neig or as oo e ie . nv Mon Dec 26 informed of several grievances w/neighbor. 16:00:00 PST 11323 148TH AVE Referred to KC Alternative Dispute 2005-0674 RFN C 2005 Mon Jan 16 16:00:00 PST 2006 SE 1023059412 Resolution Program. g� eig or sump pump raining on o Sun Apr 23 property.Inv found hose from sump pump. 17:00:00 PDT Tue May 30 17:00:00 PDT Neighbor unaware of impact and will re- 2006-0347 RFN C 2006 2006 SE 15609 128TH ST 3664500315 located hose outlet. gg ee or ig t-ming. wi no pipe r - Wed Apr 26 side ditch,bit prop owner can do via ROW 17:00:00 PDT use permit.Provided info for water in 2006-0357 DTA C 2006 Sun Dec 31 16:00:00 PST 1899 SE 15859 116TH ST 638100138 crawlspace. gg u u ormwater rom ve . nv oun 17:00:00 PDT Wed Aug 30 17:00:00 PDT 12601 148TH AVE developments(under DDES)contributing. 2006-0515 RFN C 2006 2006 SE 1023059355 Provided DDES contacts. 100 eig or apos;s cu vert p ugge ut et Sun Nov 5 for D92220?SJ dispatched 11/7 1035. 16:00:00 PST Home phone 425-235-5803.Private drain 2006-0692 MNM FCR 2006 Sun Dec 31 16:00:00 PST 1899 SE 16027 125TH ST 1656600150 system. 101 e an 16:00:00 PST Changes to Windstone dev causing 2007-0029 DES C 2007 Sun Dec 31 16:00:00 PST 1899 SE 14702 105TH ST 323059210 flooding&erosion? 102 ue ar ons ma ena s ore in pon 17:00:00 PDT 10731 148TH AVE tract.Represenlative of adjacent 2007-0223 MNM FCR 2007 Wed May 2 17:00:00 PDT 2007 SE 323059274 development notified. SEP. 14, 2007 9: 33ANI��--KING C0. WLRD N0. 6772 P. 3� �� • �ING COUNT�f WATER RESOURCE5 bIVYSION �-'^�`�� DRAINAGE INVESTIGATI�N REPURT ' Page 1: �rvESnc�►�ox REQ�sr f '1�►pe � ROBI�M: �� . x�v�v BY-� Aate:�� OR'd byL E No. �`Z�d�� Received from: � (�Y) �� (E�) ��. rr�: 1� UA-�� - rric�xg ��4 � �57�' •� f � �'Jf� � --City �,�I�h1� State Zip�� . Anr��ss• 1,�W,�?��'��' �� ..acation of pmblen� if c�'eret�t: , I2epo�'ted P�vblem: CALL FIRS�'� (Would L�7oe To Be Present) �j,,,� ru�►�.r � �' �j �l Wa-S Gc ��( �lo� o-� �, � t,�l� �� (��"t� l�In '�1�� S1�c, � -g l� �(',�{- (� �'1, �' . "� �� .�►�j -�v� . � �� , �� 6 � �� Plat name: � � Lot No: Biack No: Other agenci�o�� No�eld ir�vestigation r�quired �u� �.. .� ,s. �'. -:�. � � � � . %4 S . T R Parcei No. ��7 Z3� ��b�� roll�0�� T1iBros: Nevv • . Old 7j��' ��Sin� Coun District� . Charge No. R�SPONS�: Cit�zen aoi�ed on �� bv: � pL+o�ze ]etter , in person L,,'�/��r �JP.�C.r�l�'� ?'1�� ,SP� �C•�rcfic�t...� N �'r� �- 4/z�9P�� ert 0'� �� l'"p ��IP/� t� �c,��,�C.i._c 1•T' .r7lt�/.✓�-c� ��r.cs.,�, •�� A�Y-P r3 �P� '��`�° ��`�'!,�'-�r-� DlsppS]CrION: Turned to on / 1 _ by OR: No further a�tion recommended because: ,^.,� T..ead aget�cy hafi bPe?�notif�i:�,.__._. � •-- �blem has beeu con-ec,-ted.. Y.! No probic;�n�as been ide�ed. Prior inves°�i,�,^4�oti add�'e=..��s prab��. �� Private prob�em-NDAP wi�Il not consider because: Water originates onsite and/or on neighboring parce�. T�ocation is outside WLRD S e$. Other(Specify): bAxE CLOSEn: �l � I � By: _ . . �-,,. ,:, rw;SEP. 14. 2607., 9: 33AM , KING CO3 WLRD . . . N0. 6772 P, 4 }: ��r��• .,>-,. . . � , , � . .� e , ,�'?';'f' , F t. • , ,'•' ' :.' ', ,, ti;', � ' � ' ' °r • ,r.' . • � , ::x'.••'. ;. �r,� � ' . . . , .,' �, � -":.c.� , � , � . .�f • . •k, �• , , . �, • . .�.^:. Ca�plaint 9g-0151 Rutledge Investi�ated by Pat Sim�mo�os U3/O1/99 Y met�a►ith Ms.Rutledge abaut the drainage tbat flows in the Hoase pasdu�e behind her home.The water flows out of a pond/wetland and througli a swale t�at is about 50 feet from her South fence.Tbe w�ter is about 2 feet wide on the West edge af her properiy and S-G fe�t wide on the East side of the.parccL'Y'his appears to be a natural drainage couFse that flows whea the wetl�d/pond get full enough.She would l�ce to keep the s�eam narrow ta allow more room faa�the horses. � T stated�at T would look into the nattue of this dramage to see hnw it is protected vndar current codes and provi�}e her with some mforms#ion on ttae z�estrictions�aear tf�e dx�image. 142°d Ave SE � � 11b�F2 ' Rutledge � � i � , � � � , � � � � � � � , , � � � ;-------- ,---��--,---� Paslure , , NTS , ;� , ' �-� , � � . , � , � . � , , -r-�� , , , � ---�-----__----- � --------�--_ �_-�------ --------� PondlWetland Dzamage Swale . APR, 5. 2007 4: 07P KING C0. WLRD --�~ N0. 4309 P. 3 �-� ' ' . ,��t� C,.,�..;� ...�,R��.A�n L�m REsa�tc.Es D��.., . - ��. * • � . � � ; � ��1N��E I11TVE�TI+�A�I�]►�1T�EP��tT' � � � . � � . . ; C�` � � • ; � • , 1N'�S'r'ICrA'r#ON R£QU�S'� � . . . .` , , T�'p� � � tb�L�14I: � ' � � , ' , • , - �.�E�CSIWED�Y: � � , D��.� °��b ,� �N�: a :o� �� . ' . ,��ei�d fxoln: � � . , ` � . � � ' . � . . . . .' • , ., .` � , . � (D�y� �� . , ' ' , � (Eve) f .. ) rr,a�:� � ��.��,�:,�2.�� a� ��_��'� � , � � .� ADnRFss• �f�(�� /�� ,rr�_t�, City � � 3t�ts Zip '�L,��,� . � � • � • ' . , . • , ' . • - � . ' LOCATI4N OF PR�pBLEM,I�'D�NC: . � , � � ''� , � ; . `' �� -- . � - ' • � , � ' ' � ,�� , L A ces Permissi,�n Orastted' � . C„�Il F,Frst (Woi�ld T�r7�e�To se Presem) �'� �13��- ' �� ' �" ��`�� , r � � r � ; , � , ' / , , ��C�^`�"�� ' ��%�� . Lr��L'¢�� , �/�'��, , •� ,. j � f I ' � ,� G� �� '�-� - �� . � �� , . . . -- c �� 7 , � . , , ( t ' � ��'�i��"' - y / ' . • . . � • r� r . � . . � , . , ' • . . II , ' • . � , � ' . � P1at Aam�: , , L�ot I�o: Blrac�C No: �#.b,ex ageai.�i�s�invt�lve�:. � � ' ' No�eld in��stigatiou requiz�d � :� ' �� .� � �_R� Parcel Na. ��Krt�Il�,� Th.Bros: N� � ", • . �- - . - ' � ' , , � • ' • ; � • � • •' C��`�� ; � �. , ' R�s�'�� Council District� ' ' Cb�a�ge Na. � , , , RFs,P�dY�E:. Citize��;ti�ied on .� � by: � pk�ane letter y in peision,;' , ' ` • . , . � . � �G�'35�1''�1� � �� • f . • *-l N�� .� �T �u3i l.i_._ --, �? ��' ' � = ' t�U ��'ic:��. �� }�ti1.� °� l��=-� P�r`rra'-�i' �.�� i�'►� , t-�� 1� , . ` j��`�i`,��--�h � 'T� r1�� ;.�a�u� Mo�i d�� '�'u�� '�°`� ,� �1ISP�S�}TI��T+i��tt��(Z�/ / �by OR: Na�rther arr�on�recot��nded b�use: ' � L�ad a�aney�as be�u notified: ��r- ,7'�-'� C� 6-a�r'�' ��c er-rS � � Pto�lei�n�as 6teen corrected. �.Na�roble�.fias 6ecn�ide�at�ed� p,rior'i��estigatipn add��pra�blena'� � • '• � � � ' . ', . • - • '� ' '' • � , �FII.E# ,_�,.�,��• - '; � ',Pc�v�'dte prAtii�ui-1�jDAP i�ll�ot�rco�side�'�becau'se: . � ' , ' , . ' � , ' ' , . , ,; . , • � � � � �W�er brigin�tes a�isifib amd/oc�o��eigb.bormg parcel. ' ' � ' . ' • , ' � � ' � - • � • � � ' LQr,�tion'is out�itie,�Slr,IrD� � Area. . Ot1ae��S]�eoaf3'�� . � , � '�►.��`c��ss�,�_' �7�, 1�'�a� �ay: ' ' � • � �' � ; , - � _ � " ` . . :'• , " . , � � � � � � , � � . ' . � - _ � _ ' . . ,$ .APR. 5. 2007� 4 O7P �- KING CC. �ti' C '�`g�",� ��;,_.� '� "��`�5� `` ;N ��` "`"' �'� � , G M . ` ' , 0. 4309 P. x � ��p y;, '°`+.�Sz ar. y�C'� '� s�- — ��y ix�• �t i.t,f �� + b�t �'k�`x.�`,.. .�..-.r�,��c&i�y ��r nr�' * 3 y' "t '�� {t� /'.k r �`' *}... �n i X� . .�,.,''lti�'r'' '(:K •�.?-1'�a �, � �`J'' 'yr�. a`� 'a, �s �7 ;�y� �i./. 4 ,;� ��'{i ,{�"r' 1 R"S,l�"� T'irt:L� �'fj1.�� C' i -�.� !''H�� + ..,�-oca.o.;,.Y,_y.'� ��1P:»�"�A;w� �, �..�, ��r J�"..�'Zi'y��-a.t-�1 J�G"��!4. k x� ""y:i°f,p; w+' �= �f y Cor�plaint No. Q(}-0473 Name: Michelle Pestl . ' Tnvestigated by_ Virgil Pa�campara Da�te: June 30, 20d0 I DETAILS aF INVESTIGA.TION . , I met Michelle Pestel on 6/30/00 a� 11,00 AM about her major con�cem on�her large Hozse ranch '' that v�as ixnpacted by diverting water runoff to h,er pmperty. She u�formed me t�at three months ago thc ne�ov z'esidence/business oWner has graded the access/turn around section of the road thus ' divez�ing runoff to her property, that they have been dwnping gravel And r�aking it as a parking lot fox their busil�.ess and the school, that there was an a�rreemeut between Apallo Elem Sch.00l and the new residence/business owner that the school will provide giavel in exchange the school can use the road as an access/parking/turn around. She is conce�rn of the polltrtsnt that n�ay bring to t]tie ditch and may a££ect her hoxses. Her minor concem xs runoff conaing from the House #11715 goi.ng to k�er property near her residence. The private road seems to have been. graded (Gut) G"-12" deep at eastside of Pestl Property (sEe Photo #1-#3) fihus creating a lowest spot and nmoff enters to a sballow ditch i�xside their pi'operty �,,, � (see phato #4 -#6). Records in DDES does not show any recent application/approval af any earth�+vork activities� in the area. 'The 150�' Ave, SE is higi�ez by 4'-6' fhan Pestl eastside properky, There is also an existing access road/easement inside thei�' properiy (see photo #6-#'7), from 148� Ave. SB ta the barn entrance. Pes� property slopes from SE to North,r7vesterly. � _ .t�',� �. �� '� "�� '�� I'o ' '`• ��. a ' � DNTS � C�* � : . 1 ��•---•� � � • PRIVATE RD. : � FESTL : - 1 PROP�X�TY � � ; � LOWESr ApOLLO _e r PES'I'�L e ' SppT ELEN� � g��.��E� # 118b0 n � SCAOOL. . � � � ACCESS ROAD/EAS�iT . � '••..� C�=� . � • . . .�� —•-^ �• . +�---�.._...� �.._..---- • . /"' ' . � I � � PESTL FAIZi�TG � Pzivate Road/ � � p1ZdPERTX Tura Around/ BARN � p�'� �* � � � '- I ; • � j SEK�'LING � ARBNA PROPBRTY � I p�'. � i � FRQP�RTX ��j - . . � �y � �_..._..�. �.--••---- , : '� Ditch \..� � '�� Improvise c�ainage - . '� . � '� �1 APR. 5. 2007 4: 07PM KING C0. WLRD . f � �� —. I�nvc CoorrrY WAr�Arm LAxn R�sou��s DYvrszoN � 4 3 0 9 P. 5 DRAIl�AGE��YNV�S'�'ICAT'Y4N 1�EP4RT�� n�vssTTa�,�vN 1t�Qt�s�r TY4� �� BLEM: /��_(��d t� I:�ECEIVED BY: r r G�r Date: � 6 f/ OK'.d b :��Cl F�No. .- R�ceived from: � (Day) �� (Eve) �� I�TAME: ,�-�'�1/1✓ S �l�A/�'_'� PHONE ��={ ��,— ADnx�ss: ��ff� ,�� /�City n1 State 4(l1�Zip ��d S� LOCATtON OF PR(3BLEM, IF D1F�EREN�: Access Per r ted �F� (�Wo�d I��e �°a��i�� w�� '� °�� v�'�'iOcc� c-�'.�� l,�i� l`�o �.-� a�v� ��:~� �� r.�✓�� ,� 1��'�� : ��L �' VI ��^" ��I S sr r �� I �/ ! � �r_ o✓JG L ��v (��'�� o�. C'f�-�'� s�!� �G�iti1b�� 4� ��t -�d.��ev�, Plat nazne: � Lot No: Block No: Other agencies invoh�ed: No field in�estigation zequ.ired i.. �ti_r.0.I V°.. �...-.� -.„ra,t;a,:< .,r..��+r�� .�-}� ro ^r �•�..vy�.�,� �.�vac�['4- �C ti{�y�c r ti. �."0 6� : r:c; �r�.+r��' �-Q' �.l �k�'(t�' 4'4. ' �Th Yq�$7'' x� �D T�� °,� :�Y7�� yra � S Nv V '� S A � G i� . k � f .�' �},y",� <e� i",i '�.'l�(-{• � ..-r . �'r �+-�'„�..jv�F.�'�`.W7'S`,�IJ 4y'`�-Q.L*A_V[:h11+1��,Kr"1'\7R^'11Yi.'K,�(�y.T . p[ux ��° �"R�,'�c" c',,�.,� ^-1� ��h�� :..� .._r�':...+i.,.;.3�."Qr.�.� . ,l.:;tt,t..-.... +s..�.�'.>......+.r�S.iF`.�.'.. � ,i. x._,N ;v �,r.... .:asaea.vK n._ ��:�arf.• ..�.�.:^. _u'.�u.`�zr3' �-�C'}'4 .�'�.+-��..r-�,�!,:.}a-�.,,.,;�s ,.ias"«'. +1 � � � 1/4 S T R Parcel No. �)r,��,�rU Kroll�� Th.Bros: New 7 $asin�_ Council District Charge No. $ES.PONSE: C'[tizen notifted on by. phone letter in persan �rS�� s-S� �/�cs�r a Y I�o G.� S. �'�an��-Y rs � �cu�rlr�'r� �-3 �t��/ ��dl.r7/�L. I"/�' �s�.��c]� �r ��'�iC� . �tJ t�' W/�.� /� �i�J1�� Sw iNI ��r,, /�t'c�r,�l d� �79�-�/�-r�y ��-� �1.�.c.Ti�r,�r��l �aa��.�r.�-�. fr�✓',�r-rr.�� T�ISPdSIT�ON: Turned to on � / by �: No further ac�ion recommended because: �. J_,ead agency has been notified: _ _ _ -- - _ Problem has been cocrected_ No�roblem has been identifed. prior investigation addresses problem: S��c�E# Private problem-NDAP v��i11 not consider because: � Water originates onsirte and/or on neiglibora�g pazcel. Locatian is outside WLRU Ares. Other(Specify): DATE CY.OS�D: � �� a By: ., � APR. 5. 2007� 4: 07PNp�"'"�' KING C0. WLRD ._�.:. �,_ - . --- �:r• �4.;_._ 'k�a}v��::� s� N0, 4309 ' 'P. 6:� �••� •.�� , PROJECX' �'`"�� . ,� KING CaUNTY _ --- .� �xo��r (NDEP�NDENT BAPTIST CHURCH � Departmet�� bf �9�atural Ra�ources ��,�pN 148YH AV S� 1 ��. Water and L.and Resource bwlsian MAY --.- KRpI,L.PAGB BOfiW SUB BASIN TB pAGE �7A7 Z-yPg POND FACIL.iTY SK�7CH SHEET ��DNLSIdN Two nAr� o�rog�sa � � ou�r oF ss�vrc� --�� - PJS ❑SPEC[AL US� PERMIT ❑N� M�W . N ❑MOW x �SPECIAL MOW • . � _ C SJC 8-1 r7RASN RACK r� GPEN OITGH B LLARDS _ � , � t�x'c I � �.. � �. i ;,µ.�.,�.,`�-'Y,.",.�.�� ,� .��_;:,..,-'�:ry. ..iw�:. ,G..'7.^'. PaNO � � x' "� »� � � . � � -�.,ti:'��-: � STE�� T.,. .'t.*y �,,,�r.,�_� I Gj,[ . BUI�QING � - '�tt�,.'a''`= ,� "�"i.,��'"r" �-.. I � � j ^�- ;�: �,�.� � ' Q HOAA DtTCH ! - - ' jr I �� , � I r �...,p.� � � �� . .:�, , � 00 , � : � __ _ _ _ i r � � � � �w•� •1 �� , �� T" � � I l � I� _ � i `n''�'� ___�_! - _ -- -- � C. ---_ .,. �-� �so�arioH ,� � �� .w -� OITCH HOUSE � � APR. 5. 2007 4: O1PM KING C0. WLRD a --.._ N0. 4309 P. 7'� �"'-'-�` �nvG CQu��7r�t A�m L�m 1�Sc�u�tc�s�rvxSrUN � � � � D�tAINACE INVES'Y'IGATYQN REP41tT nvvesTtGar�ort R�Q[�s�r � Type _� osL�:��-�1F�t-�o �F wA�l� !o H� i�l�� . R�C�IVED BY: �� n�: r I� D o�'d b ��'�$xo. Zoo� - R.eceived from: (Day (Eve) �� NAn�: ��-�N�� 7'L. Pxot� �� "C�f°� x�n�ss: I I � i� '� �� - c�ty �� s�� w� zip �8a� LocwTTON or• ��o$t,EM, r�n�xErrr: � �t�� Access Pern�ission Gra�ted Call First (Wou1d L�ce To Be Present) � �(�g�d� � 2 g°�� L� �rn�� G��7� �Dt�� /�r� t-�� op�' �m� ��b��t `l� ��-t� '1�� '��'►� .��-� �T �S F.� . � -t�� t--�o ��-1�� . -, + � k -- �t�N�� t� �fi` �� Y�P� �� .��4 �c.a.�'►��--��`�--��f�-- z-- '� �� '`_"�-� - Ti �i�� L.I I� .� C-�c�� i ��t�J . � i�-�I�l�'�— �1--�� 3��-�Z�t—�� f r/�-�� I � �'�� T �-� �f��J�J Pl�t name: ��j �'�_ �('�,� f'�'j�� Y.ot No: r,2�f Block No: Oth�r agencies involved: No fi�id in��estitration requized � .1`�w'v;•, 't� . �� :�s��k 5��a{�l�'.V [�>r�; � ��q�.v ,�. � ry.-� :� r;� m � r ,, � ��i;t r ti �Hre�^ (��iV�.re[ o N,i � t�4�: + • . , � , '� ..;.,. ,. , , , .,. �:, '�I ' �'i��" �111 v��7�.T'ZD`�3' i�,r�. ' �"rr �';:ra,aw,��, ,� �`.�,�:'�'t^w� . , . , . , . � , �:�;a.��ca��ry t�B�,c r� �"•li'' i •yi^ .�� e�: �-i'� w� w �i. .� o.�.. �u.'r.t ,3��,r4r�4�h.+�t'.:'rs.r�;��:�"F,t �.r2� �., �-`I��,+� i .� � � %4 S T R Parcel Nv.��,��_ Kroll� TtxBros: ATew (�-� Basin�� Council Distriet� Charge No. RESPUNSE: Citizen notified on a�� y3o d I by: r � hone letter in person � �G��•. Gd�"��►t-l�f..�i--�M � �.q ja t�.��'�'f+ �� I ST`��'►-a P4�°��1'�ec ��7� r..4A.?/�S �xH�`�� gF�'� �'��l�- .�h� ��-+� 4-1��'�i-1s� ,u 5i'� 4�rGd�,' �i�- /�� $Y a�S•A�� I C.� t-�'�'9�4�G�'I''r`�i�„'�T P�'¢ � �,a�.c~°r s1 D�� —td�a�` �'�� 1�h'S�+"�1 cs�..� 5�1��Nl� ��i`�"� - �� P�� 3'��L�� It�1�W��N Cfl '7t�'� �►s� �rn�'I�S.`�`I �r� Pt�+-� �i�� S r`'�!�°�-tS� t-b►4 L i�-' 7i-� DI S1T�OIV� um o w�o � N�� ,��'�•`. �'t� �T.�t�� `S � � by R- No fv er actaon recommended because: ,_ Lead agency.has been noti�ed: _ Problem has been corrected_ � No problern has been ident�ed. �'rior investigation addresses problem: S��.E# �C PrivatE problem-NDA,�will not consider l�ecause: �Water originates onsi�te and/or on neighboring parcel. Location is outside WLRD rvi e Area. Other(Speci�y)_ • �ATE CLOSED: �I/ .� /Q � �y: w ♦ � � APR. 5. 2007 4; 08PM KING C0. WLRD N0. 4309 P. � L.� l..ijil�:l�lUi310'vl. GUVVV.iV`T� �Ccl�iil6 6}11i.. 1..w4'-..�.u�..u:� t��uu.�.�-ii,;�� —t,,_.i•_;_.` .......,1,,,�...� Suilding w/aut permits;Permit status:Pextdiag;Dabe af applicatian: 4/44/2000 � Pii'Vate�LOad ;;�t;�'r';;'a?•- �;�y,��'�'�r�'r' �y�;vni'w�S��t�. p�� .;:�.:��L,.y�F`r.::s �� —Cl � Bl ��Idl �m �.':� : � � . ��S � � . � � . .t.� % .1}1tG�1 . � �, .._ � �� - --� 4 . H • � PES'zL � l PROP�RTY � ■ �' ; � Lw� Sp°t APOLLO � �ESTL e I � ♦: tli'verted here) LLEM #1180� n I � SCHOaL. � E��nce!Exit I � ACCE�S ROA.D/�ASEML�NT ^.��°r'�"� �r�f�� x; ''•. � }�i!llfl;��N�� q � �(j��{�li��.i,r�lni�1� N • ��^��fh"��:�j,�'i�1�(H i�e'r��kh i < � it�4 4^ �'It4�?',��"�'i,�:.�� rt''�v � p V�!�.Y . �--- ----- ;.y,"st�„gu" ' �''� • �.r��u �i^"o�(i�� . �---------•- .I----__.._ .-- � -,.�� 3��.;;��;�,��r? �tY,,, ■ :';' s;�o;�,Kf«; "' ��",�sE ' PAI�KIl�iG ',;�-�'s�''jG<F��w �,��h�,ra p, ;:�.,H�+�;x�� r�„��„N �� irl"M�1 ' pESTL � «�,�;��. �,wia,r;n�r��;E,E�,�� yun Around g'`r'd ir�rv n JI1��,ji��a��7�::R1�li1�;; i y��(� � �,, ��?I.,6�a��;., � :'�:h ',f`3�'ka.�r<��1�� A,z FRO1t'E "�;�' ,,;�� ,.}�"�' ea CrRAD1NG hi,l �I��a cM r"' inu%��d� l l Y 11� Y`"U�;; P��,,3�3" ,AG� BARN ��"'i' ,�, „�.. ' � - � � �aus� ��. i . . - �xA U ' ! �vT'. � �y � . E�'Lri�tG . E�asian � PROPERTY � �"' . PROPERTY /Ariditinn � ..� � �;,�i"'�r� '�;, :>.:, � , ��H�' ._ ._ �_ �_.,� �.._.._ ,.n. , � � ,�'�� ` '4r�i` '\ �. � �� °;r� '�� d Ditch �,;,�-- � ��, R : ir,provise dsaLaaoe� Shallow datc� ,e� � +��-� D98237 � � G '� �r��,'`��` z �^h � r`' �" `""x^ � °*i fS�N �`r i � � 4,.ti ,,y�Jn� C �y� �} �s a� � C "� �"' � �y i �A�r � �(� ,� k ti,• ,y,� 1 '�C f � �- .4„ k. � 'k. � � � C �� k r f r"�h.7�,1` �^(�'`•"'S� � '�b,S 'a 111�� JI h tr ��" �� ,Yfi � rh��ir ,^alii`�'� "°�'�F�, ,� 1 . ��i�� n�� 'T�l.� t r f }'a,� �1., �CY> h .N � Y 1 'S 4' }y� i ��r '. �a° � �r ,^� .y 1� t' ,�� r4.f .'Y �'yJr , 4 $�� .�ti��yrFh 'h'��' � t �•O�G�rwJS Y .'. f, ,� r��. �i7 �� F� ,,,. ..�r r'£ , �< � �� !rd�r! p `' � r ��. a�` �.'' . � �'�;,� k 1 � �Iti :.hf �1ry`' 4�r' , r w C� �+ 1. 4 tiw� t e' 4¢ ,� �, � f r� � ri , � y � r�,� F i' �, � F 4 r ,�r 1 �4h .� J i r � � Y .7 I y. f' I �t� �r,�� 4„!?+t � +C. �[ y"�1' F''�,�''�rll'�'' i..� �+.� +' ' �s r`�� '�� 1l. . �`H+d�ld O "��,�' a�'k o_ a k '!If�p,r�� G . t��p,� � 4 t r � �4 H M� 1�,� � n {-p� y� 1 p r' ,,j f(1'�� ar �� ,! t� ��I4Kt� f�,[r'�i�+ru Fw� � ��n1i��JLL�il .' F��4 k�i ��f 1^ J 11r Y4Y 1 d !' If4•T F1 f �IS 4p� i'r , 4� Q�/y�.* r. N�.6��p��},"�i o,.,i rq �1��,u � �4 v��+ 1 � � �' .r� � '�` 7y 17C..1 G 'k�{.„i� r-^ Y ��'y�F^tH�'��e,n I'�,��E7�4�`k��h�P��Yr� f f�5 rwM'�r�I° �y u�}J�yq✓C�i�}'�y'�1 LrlVE'rwa� . '�i�.��uL��p . .'.�e{ ,,'7�' .-,��'"�t d��J��„�i�� t;4 t � �� la��`i�4 1}� ti��+i5ti*N.'�i�fn � ■ • • • � ■ ! � ,.+. �, r' " t �� 4 1 . I"� :,a�'IPr �1 i G-7 ` i'��4 4'o-^ P�" 4'�'Jry p+, c; r��j ,tf ,Y:�, � N � ,. M "' �j�r=,�4.^'^'{{�'� �77T � �d �``� 1��1'f'w��d.�y��`T'�'-�- ,` �f''�V.x1�� c.��LJ c�,�1+].1.a�1�W�11� �P!"� .-�. �DuSPr 1 �N��„hd � �'v��ti �� 1� > �� I�d �rrt�� ti/�M�.r I� �N �� {*v j.,"� � ��'k�`rt �t � �r�i � �� 4'� .}t ��(i � ati"'� f �4�=y�' t r �a, p F 3� ,�-.rd r�"� z� � �., aq.a �' � � � i� '1��' � J i�ir i� � i , �'�,s �1�� e� �'��, � ��r �, ti � �'� � lir E �� C�� '�t f p, k � . k`rh . r14/' �ro��a�a �� M ��.4. � � „r �, r � i,i, ��; , ��,�6��r,��) �:.i ; s,�L ,�,, �;�;,� �- y��r1r� �� 5 � � , � ti � � qG �� ,�� , �� 'i+@ � '�W'+l� �C,� -r r4� ��5�� }�1 {'�J S�d!�i�"�F�� 'r9�A��r�Ofe +��i�+'aM1,��+!,``0 i y��i��Pt� ��,}f 071�l�Li � ,� � ��.� ti '��`�,�''.p� �I�hk�r�,�aS 6 5�f��y�rf��d��q�.y,�'Ct�Y.. '� �'" �ti�+�v i Yv''.n��i�i,,a4�'� + �,.� l5 i� i ��.d'�k;��rd`�� ' _,._»�',.� ..r�..��.W,`'in.�� ' ,'�Y.'^� #�dit�E�d�M'6i47d�.,. i l r ■ �� ■ ■ � .. r �� ■ ■ �� r . � ■ • ^� r ■ � ■ ■ �� ■ ■ � . r � ■ ■ �� M s�_ 12o'H sT.(Private xoaci} . SEP, 14. 2007 9:33AMlv KING C0. WLRD;R�D�ivnRESp�tCESDrvIsiCNO. 67)2 /�p, 5i�' -' DI�iYNA.GE IN'�ES'I'�GATION �PO�tT GA'RON REQUEST r�� n,�pBLEM' �� 3-�1-p� tc�cJ�rvm sY: . Date: � � OK'd b : ��Z�'k�No. 2��3 -v�o2 Received fram: �,��f�,,, � � �aY) ��.� (�ve) '�� NAM�_ � pxor� c I��3� CQ?'�?-D�� an�a�ss: /�� c5'� �/�O�c�'� _ cx�y sc�� z�P�� X.00ATION OF PROBLEM,IF DIFFERE'NI': .I./��b�t, , �'LJ . . . 1 � f `3[l ,� Access Pern�rssian Gra.nt�ed � Clrll F'ttSt (Would Like To 8e Present)� '`��'��0�� " �� ,��=C•C.Cd (O�!��r�.'�`�'� G��..vc.c'"f� �/l//L� ' i � � . � ��'/��i�?�� C� �� ' r� f�` �.�h'�� 9� d�� ., a�!��-� � c.�'�o f �` � J,��, r . 'j�.L� �j �r�. C.I�G��%�/ � CaC/ •i��i� �a��+1�/C.� ��C.�/ � �� . Plat name: � �� 'j�. ` ' Lot No: Block No: , 6 Qther encies involved: No field i�ves�i atiom re ' d � �'��1�,'�.'�M��"�vJ'i�'+�.8,��"�^'�"M,1�-C.�'�^K�.�.� �:•� ,-;!_��,.�w�'� ?Mw4 ,^,�w�` �"�� M yr � ■7111r7� •�'x'LDi[� / .� _� 1 � �10 � z/a S T R Parcel No. f�oic� �1.�� oll�W Th.Bzos: Nevv � ,R�P Basin�,,_ Council Disirict� City � Charge No. RES,PONSE: C�tizen notified on `�'�l Ir0 3 by: _?� phane letter in person • �.4 t=T l�l�s�G,-� C�.o.�n,p4u4-�-r-� �t3�-r.�4, S��i� �r,�2. �,�wR2 Rr�u��e � �it�Yv� �E2�]A�� S�t�-�lt.��r /� �r��' �� d�Jt7�C T� . Drsl�osYTxoN: "Ylu7aed to� on /�i f� by O1L• No further actio�recomnnended because: I,ead�gency has been noti�ed: � Probl�ni has been corrected. No problem has been identifsed. Prior investigation addresses problem: S�E P`XX..�# I Private problem-ND1�P will not consxder because: I Water originates onsite aud/or o�n nei�aboring parcel_ • . _____4tl�er�Speci�y): - }aATE CLOSED: � � f`t�a� sy: .�_ . •?•� SEP, 14. 2001 : 9: 34AM;��. •�--,KING C0. WLRD.-• � N0. 6777 P. 6 � ,i� s., ��;..�.r: ,yr!}!.t•�._ ...,t � �NO. 03-0252 � K�� c a u rv�r�r N� C��S McDANI�L ' Departtne�t ofNatura��sovrces �D� 13825-S�116TM ST Water and Land Resourr.e Division P�� (206�1p�304 626-H7 'X'�PAGE �t4LL PAGE 805W . D�,�,� 4-09-03 URAINAG� INVESTIGATION REPORT ��,I,.D�sYQN z ,nv��,s-�r FIELD [NV�STIGATION DET'AII.S O�'l'NVESTIGATION: GOMAI_,41NT STA7E5: CITY OF RENTON BUILT ROAD WITNOU'f aFiA1NS.WATER FROM ROAD RUNS OFF iNTD N CUl1NTY DRAINAG�THAT'FILLS WITN WAT�Ft AND FLOWS ONT�HIS RENTAL PROp�RTY CAUSIIdG tT TO �LOOD.RENTON SAYS IT IS HIS PROBLEM gECAUSE HE IS IN UNINCORPORATED KING COUNTY. � PHOTQS TAKEN#1 SHOWING GOMPL4INANTS PROPERTY AFFECTED 8Y bRAINAGE. #2 SHOWING AFi�A OF RUN-0FF WMICH ENTERS COUNTY CIFWINAGE. #3 SHOWING NE 10�N ST WHICH DRAINS TQ ARFA SURFAC�FLOWS NO DRAINAGE. 6�TG'kx: � , I ��. -- - - - 154' 110' ROAD NE 10TM ST BARWCADE� ASPWAL7 WAIxWAY _ _ ._ ; CI7Y OF RENTON 2 �` 26' FLOW DIR�CTI�N 3z' UNDARY f DRAI IAGE DITGH � _ _N�1�TM ST � i I HOUS I � I 13825 13827 , � 3 I � CATCH BASlN Cp,7iCN BASIN � �,� f I----� __y L----,.��---- I � �- — � . . � � � � a a A W � SEP. 14. 2007 9: 34AM KING C0. WLRD,� N0. 6772 P. 7 ENCriV�ERYNG REVIEW QF D�A.�NAGE Cb�VIPLAINT pATE: 5-27 and 7-5-2003, ]�tE_ ENGINEERINGr E'VAY.�TATTO�T F�R COMPr.A1N�f I�Q. 20U3-0252 McDanicl �3825 SE 116�ST1��T,RENTON C4MPLA.�N'f CHRONOLOCY: ORYGINAL- 3-25-2003 FIELD IN'V: 49-2003 BX N�II�E MAIN�RYCH FIELD EVAL: 5-8-2003 AT�AN MEYERS OLI3�,ES: NONE BACKGROUND: Please xead the attached complaint investigataon report writt�.by iV�i�e Maln�rich. '� FYN'riYN'GS AND DISCUSSION: I talked to McDaniels on May 21$`via gh�one and learned that the pzoperty has been in his fami�� since 193 8. According to McAaniels the City of Rentoz� approved the Plat of�rust Properry rEsidentia� development without proper detention storage. Since it was completed in 2001,he said his east ya�rd that did nat flood before the developm,ent now floods up to t�vo feet dee� and 70 feet zn diazz�eter in the area where the txee house is located. '�'l�is calculates to approxi�oo�ately 4000 cubic feet of ponded�vvater. At the Ciiy of l�enton, I picked up plan sheets and the Technical Ynformation Report(TIR)for the Plat of the Ernst Property(developed tmder the name of Laurel T�ane Development) a�ad�visited the site on May$�'2003.Mr.McDanie�s was not pres�nt since these two homes aure apparently rental properties. I talked to one gent�eman at the largez I�ome but he was a new renter just movYng m and �tne�w nothin.g about the flooding prob�em. I called the owzxer and left a message for him to call me. T toured the Iower east portion of his�roperty and noted it had dam�p soils with some wet type , vegetation and Japanese Knotweed. I did not eomp�eta a topograpluc survey of the east yaxd�uvhere tlie tree house as located. On May 27,2003 I talked via phone with T�ayren K.itfrick at the Cnty of Renton De�velapment Sezvices Division. She said McDaniels had attended mar�y predevelopmezzt�meetings and seems to be agai.nst development in genezal. She said the drain.age impacts a�n Mcl�auiels property is a combination of the City of Renton and King County road and development projects. She sa�id she observed skunk cabbage(a�vet site indicator plant speci�s) in iv�cDaniels property before the development project of concern begazx.She said Ren,tpn has no plans to relieve the�ooding problem by conve�ng the stormwater flows from the cu1-de�sac just east of Mc77aniel's px-operty west along NE 10 $treet to connect i�ato tl�e 138`h Avenue SE drainage s�►stem. I inspected t}�e plans for the recent Haze�High School ballfield improveme�t pmject and determined there are�a drainag�impacts from this project on the McDaniel's property. i SEP. 14. 7007 9: 34AM KING C0. WLRD./ � . N0. 6772 P. 8 I �,,e Ernst prop�,xty development project was completed uader the 1990 King Cottnty S�face � Water Design Mannal as adopted by the L�ty o�Rentan. A.ccording to the 1990 Nlanual and as � d.iscussed in the development's Stonoa brainage Study, 0.26 acres of the projecf dxains west down � N. �. 10�' Street onto NIr.McDaz�el's property.�Iovcrever this stor�nwater is exempt from de�tention storage because this�ortiom of the pmject will not iacrease 100-year peak flows by zx�ore than 0.5 cubic feet per second(cfs).As t�ze attached study sho�ws, the estinrxated 100-year peak flov�r from this sma11 area�vvill increase from 0.12 to 0.18 cfs. . I called tkxe owner and left a m�essage that Z planned to survey part of his east yard where the � floodi�g occurs. On J'une 2S,2003 I completed a small topogxaphic survey and took several I photagraphs tihxough the lowest portion of his east and sauth yazd fro�on northeast to sonth�c►est. Based an my survey, as shown on the attached profile uf�vlcD�niea's east yard,the ground level , under the tree house is the lowest point in this part of his yard. ; '�HE A'VA.�LASL� Q�TYONS APPEAR�'O B�A,S FOT,Y,OWS: ; Yn order to reduce fature flaoding on t�is property,it is recvmmended tb.at the owner keep the low . areas betweez�.his tree house and l�as south femce near the old bathtub clear of all t�ash, debris and dead vegetation to allow surface water to easily flovv southwest onto the next downhill property. Also ask tbe owner af the south property to move tb.e old bathtub to higt�ex ground away from tk�e 1oWest area w�.ere tl�e wat�r natural��►flows thxvugh the fence. P1ZUP4SED SO�.T.JT`YdN: I recommend this file be closed as technical assistance provided on ways to reduce flood le'vels in th�futwe. � a , SEP. 14, 2001 9: 34AM KING C0. WLRD N0. 6772 P. 9 '�� KYNG COIINTY WA.TEIt AIYI� I.AND RESOURCES DIVYSION v� DRAYNAGE INVE�'�'�GAT�ON R�POR� ' rNv�onr�orr ItEQuEsr � TYpe �� OB[..Favt: 8 z1 ' RECENEb BY: D�: a� o��d :��- �.E No. zoo3 � Recei'ved from: , . . (Day) (Eve) �_� NAME: PHONE A17DRESS: C11y Stdte Zlp�� LOCATION OF f'TtOBL,�M, XF DIFFERENT: Access Permissian Graraf.ed ❑ Cal1.F�rrst (Would L�1ce Ta�e Present) ' �- �`—7�3 d� �3 ��lt,e� /},�. . - —� � �e- w��- � � . . w��, _ �� . - �� . �� - .�.�., . ■V V�/ � � � p r Plat name; Lot No: Block Na: Other encies iza'voh�ed,: No field i�avesti I gai�ion ed ,. ' � ::�;��;�;��:�'v,,.��t�'s��,��;:;;: ;�,.;, . �� .�-- � / 1/a S 'Y' R Parcel Na. � Kz�oll� Th.Bros: l�Tew �O �DP_,____ Basin� I� Council Aistrict� G`ity�,_____� Gharge No. — ,R�Spolvs�: Citizen notified on a 1� �3 by: � pfione letter i�person --1�r.�t.l._ 2:�t�h ��e3 . , . . (�'�� `i�c�� u� s�t�-�D -�k�- � ��+�� -t��3"s� �c a�l ��y�M(� �D H�� '�s � s . ��. P�� l�`i�1 �un ~ �. �� b�-�2s��''fi�1�=�� ar-� Gav�7�u.w�� 6�'�'rn'�`�, Drs�osi�r�orr: Turned to an / / by R No er action recom�ao�ended because: Lead agency has been notified: '- � Probiem l�as beon corrected. No problem has beect identified. Prior uavestigation addresses�roblem: SEE FIL�# �P�ivate pmblem-NDAP wil�not consi�der because: Water originates onsite and/or on neighboring parcel. _�Qther(Speci�y): � AA.'� CLOS�: �I � l� By: r ��d J�b w f�"'l�_ �'� �i��'� � , • .SEP. 14. 2001 . 9: 34AM�..,��,•KING CO3 WLRD;;, ,.;��.;;,�;:;;,:� ,�f�.,.'±�.';� :�:.> ��; ,� N0. 6772 P. 10,; .►,'.N. . • • w.. , . � • �;,:•ys•�tN• tii�. .<.•.'.i . n',�' .. � i :t'. �}'• :�'. `�. . _ :.s.� .. �W.TVSV 1 � ICI NG C�IJNTY N�: �x�sTYcx�avs� Annx�SS: 11327 i4s�Ave, SE,,Renton, 98056 P�TOIVE: (42�228-3846 DRAIl�TAGE IN'V�S'1�GAITQN REPUYtT DATB OF INVES'Y'rGA'�TON: 09-04-03 �b II�TV�'S�TGATION INVgSTIGAT�BY: V'�Pacampara r�vent to tlt�reside�noe v�Iv�s. Stycansdd to invcsbigate a d�ainage canocrn an 9/i0M03 at 430 p1VY Sbe wvuId l�e some ucl�nacal . ass4�anoe drt�*'min+n�wbat to do about water seeping in base�ment She wants to kr�ow tl�e best plan fot his drsimage�!� '17ic prope�tl.y of Mrs. Stycrinssla is 8at on the east side and sla�pe gradnally towards west sid�e_Mr.and Mrs. Sty�slQ stiovved bo me the e�sting oandition af the property i��$tivn t,o the existing draib,age system It was s�mn�and dry tiuxmg fhe i�estigatio�Mzs. Styczins�wants the dxainage aatier fram the fronct sade of the propertq bo be dive�ted tiowards the rear side.'rb,e base�ment is approx.3-4 feet from the base�eAt iloot line�O eaost ground grade.Wa�er seems bave bee�n. seeping thro,�n the easmde of t1►e�x basement bnuse_1 noriced that tl�ey have su��taoap at the sE comer of tne b�se�m Tlle�alSO ShOWOd t0]11C the pIOPOSed�ffi1 p�(�'�ft1ll�wdtei SwB�fi'0111 t�dId1Il fiel�T�►'CNaUt t0 diVeIt thC WSt�C�Cdll�tb.8 dI�iII �P�t0'C�C 8d]aCeDL NW S��t]OIS jIIDpPdI�.A,CCOl�lilg t0�E1II,�1C1I 1LC1�OI W3718IIOW�1 W d1V��1C R�eI'SO�t�CdII eluaainabe the 3-4 inches s7�nding wat�r during wint,er and sto�events.I�od to t�tem that they might h�ve futiIIe liab�ities if ti�e �P P��ad tb.e drainage sysbem w�l not�wnc�on per desigt�that it�migbt impact the��v�,sbteam.I also noti�d nu�oaezvus caacks at tb�e basement wa]]s and flools.It seems the hnuse map�ave settled I observed numero�}arge xoa�of tbe trees at the east side o�the P�n3'tliat ma�have cantrl'bub�ad to the cracldoug of the walls and�tez seeping at t�e basement walls and Soors. T�gave them some it�a�amation on tirea�g waLer seepimg at the basement a�d standard sketche5 aa waII footin�drain systt�aa ofa resid�isl I�nuse aud standard trcnch. �told them that I�n71 chtx,]�We�de line/regulabions at DDES if they req�pxed a peimit finr theix p�capowd pl� �------------�-�------� �ng roadside di�h_...�. �--------•—•--- ♦ �`� � � � �� ( � , � _ � 3asement is aPProx��€ � I feet from baseiru5at flbor+ ; I •..•.....•••:::•..�p3S5��........ ............. ... �rge lzees,ave,�v�'� exis6mg g�ound gr8de= � j ��:�:::�...:::::�::�:......�.* �:::�::::::• I mots had acted the � ; .. � ou � ' ' ; � � �S . � : . . house sUcnctures. � � � : • • :: ; : � � ; � ; � ; �� S �� I : � �� "-�� HOUS� � � � � I , ; � �, , 1 I � � I Stqcanskt ' S- __ _ ; j 1�oU5e ' ' ' #11327 b ' : � 1 :� I � � � �; . � .� � � Ib :o � � `a •.. ` -'.� ' � /� 4 Q��13�,�BII�tLf I�C- i (�/ CAv�� %a' � ; � �• • ��• �� L� tnu7d/malae the Gxisiu�draipa�e �.- - :�t line�mctional bat s�uay : I � � �� ;�' encount+cr fuh�re�lia��7ities at � -I' ��xisting Draia fi�ld . . � r�r..�.,�m � , r: ! � .,I.:1—' j � ; ,.••� . 1 1 I ,,••' : � € € ,;.•• • , � I � ..,.�''' I c . � � '''� I ... .............�BR��C�l�t4�.2.................... I �y ..,•'�.•• : ' .. � - - : � ,.. � ; i :............••----••-- . ..........._........ ................... ....� i • ---... ,..•�� , ; � : ; .. ;.� � � � r-----------�------------•--------_,.-�-----�-- . --� �.• • ; s , o`neighbors � i� � I �P�P ! i . � I . t � . . � SEP. 14. 2007 9: 34AM KING CO3 WLRD . N0. 6772 P. 11—y -�.`� �n�r�Covrrz x vv.��x arm��sou�cES�u�visrON V j'�' s � DR.AYN'AGE INVESTIGATIQN' �EpOR'�' �J • n1vEs�r[c��oN REQt�s�r / Type , -GC I�O�LBNt: ' ��1�� cEtvED BY: Date: �0 OK d : Ft�;No. ZQQ3 - 0�' Received from: (�aY) �.____--� (Bve) f , 1 N.a,�: Pxor� ��7l,s A�Dx�ss: City Sto.te Zip ��a�QN oF��a��¢D�: ��f� s� ��`�� K � r�� Access Permission Granfed ❑ Calt F"�rst (wo L�e o Be Present) ❑ . ��za�a3 • �=� �� ° �o °3 �,� . �l� �9' o ' �f� . G�► �.�i�'1 � � �j . �,. �- �� . . w � � � � � � � � � �� - �i-"�' ;,� �.. � . - , � , � � C� ��, =�� . r��"'— � �, ��7�3� Y�L�i � � Plat name: Lot No: ��oc�No: � �th�r a encies involved: I�o field investi tzon re uired a��.. , �(�� j1��y n1,�:.y.�� M ��ww�..�,,,��i�i�ir,vry��.,na. rvn�..,,p„m,, wi^ "y;' .�.,,,. ' �� l��ll`il/n'W� ui��i� �w.�. .... .� '�� .iry`�k�rriK�n�� :�.��.. ��?��'�:� ��:,,.,:��::,::,':;�;�'�~��::;.�' •r��•�:�:�.:, . � � � I/a� S T R Parcel No.��`•a� KxoU. �� Th.Bros: NEw , . R.DF Basin�� Council District YJ Gity� Charge l�o. R�SPVIvsE: Citizen notified on by: phone letter iun per�on �i� P��'��'�N��'R�Nh'1� �� d"'1,.��D��. � �V��`1VY1��.�� .l.l�l.d_,. �G'�!3( c.�vl�',. � --- ��'�l �rt--�t►� .r��i�5�f �3 �� 1�C�� `1�4� �i�-aD�t.-D�R-l�tuy€}�`t�s-� Disposl(7[7toH, 'htmed to on _ / /___ _ by OR Na further action.recomm�ended 6ecau�e: . � Lead agency has been notifiied: ___ � • • Problem has been cor�ected. Na probleYn has been identified. �rior investigatiou addresses prablem: /� SI�E F�# �r Private prable�x►-NDAP will�ot consider because: - '� Water az�i�g�uraetes onsite andlor on ighbo;��ag paxcel. �Other(Speci�y): nAz�c�.asEn: �-�t�' sy: ��a�� -r ��✓�r�l �� SEP, 14. 2007. 9: 35AM � . KING C0. WLRD � . N0. 6772 P, 12=�� . - , , . ;,,,� �, . . :'��N"�.:�.003rOQ702 � rCl 1�1� CC��.INTY NAME: Mary A�ua AmundsoA �ann�ss: �c Roaa� PHONE_ (2U�296-7715 1�Y�1'AG��VEST�G�ATIQN REPORT DATE OF�1"VES�TGA�ION: �a2�-03 FIELD�NVFSTIGA,TION IIWESTIG,A.TED BY: Virgi�I'ac.ampara I went t0 tl�e�ide�aoe of�r.�obbf T�ae to investigabe a drainage pnoUlem on 10/30/03 at 3:00�`M.The comxplaiut was t�at d�ning the sto�m eve�a�10/20/03,Ms.Bobbi Lane repoorGeci flooding.�s.T.a�ae�ives iuside the C�tty of Renton.The Gily of Renton believes that the dtaina�e problem originates from aff ROW conve9ance at the MI��aptist Ch�ch.Maiy Ann Amundson o�X�C Rnads iespo�ded to the call at�raimd 10:40 PM and no�eti tl�at the R�OW co�veyanoe was near capacaty but not ove�llowing. I met Mr.LanC and s,poke to bouua�about the drainage complamt She showed,to me thc spot�te the vvater flow5�am the swale/pond� MLK Baptist Church and the loc:ation wes�e fhe wat�r an,t�ed To�s pxoPextY.He also mentioned tbat thc�cvater level at ihc�wnd is high, Dmn�ng the invesligation,we met Mr,Ke�gen af Sa��na Construetion.lVlr.�,egge�is the praject lead of the on-going caashuction Pra.lect of NE l0°i St.and A�acoxtes,A.ve.He menhon�ad fhat they took an old c�t�h basi�at t]ze in��tian af An�aortes a�ad 10�'sh�eef The wat,er has risen in the area d"*�ro the storm e�vents and wate.r w85 sb�ooti�g up with na access far the�vStdr.He said that they bave instaticd rexently a new t�Ccb basi�located at the NE corner to replace the old anc.They 8z�zeplaci�g the existing co�v�qance pxPes aIa�g lU�°Street with from I2-inch to 18-inch pipc atid alo�g Amacozbes with new 36-inch pipe line.T�c me�bion�ed tb�at he spoke tio the MLK personn�l�with rcgazds to tb�qi�(MLI�dr�in�g�e Problem.He told them tA w2uit uuW t�project is Snished,ihat it map�solve the drainage P�oblem in the anea , . X s�wl�e fio Mary Ann Am�mdson over the phone about the flooding duriitg th�e storm eveIIts_S�e told me ttat the pond/svyale is rumm�g in full capa�city af th�ti�ae sbe was at s�ts(approx 10:00 PM)_The wat.e,r is nat ovez�owing fhe banks.The s�(downstream)�vpas flooded�and City of Renton was pumping ouct the watex at the c�nshuction site_She beIie°vts that We coushvctian in the aiea anti the stc�p�abes has contr�bvted to the problem(all with in City o�'Rcnton). It seems that the wates at the ponct/swaIe has xiseu in full capacity due to high intensit�►of tl�z�n�dIUwaber nmoff at the huge�sp�halt s►�ace parl�g Iot.It bas i�an�actsd the flow from the swaIe/pond w'wards Y�he co�ol strnc��.The on-goi.ng consttucdon along tb�e ].0�Stre�t and Anacortes�as impacted and reshriated the watex�ows from pond/ditGh af MY..IC Churcb�tawazds downstre�m rn��)- �ated complaiat was recorded(1996 2033 Dotsan), vc��tC�r flows from paved�.ng lot of tLe chtu'�onto roadway then o11to several ----ir�c:rtie:c • ,O N cvv po�ad �� MI.K CHiJRC.�T pRQPHRTX 7 , (on gaing cansnucixon) l4 � � � S! Pond/swale � N�'S -- �..��-----�• �----------- ICING CAIT�i'�X JLJRISDICTION \_ :� � � - - — -- - - - -- -- �. . . - - -- - - - � -- - --- 4_ ; ; QTY OF RENTUN � � i' , �water � R�sidentiai�Touses I T�a�e � I en��ted here I 1 � #95R �,1 j �Mr.Lsue �ip�to be xeplaced from ` � j � �� iufom�atioa , 12-inchto 18-inch�ar � a ..............................................: .... .... :.•. Mr.I�eggen Information � M .........$��on Court(dizt road)�...........� y ... f � � 1 �',ipe to be replac�d Newiy installed � �dential Hou�e.s B�adway wa�s Sooded from existi�tg p'�e GB(T�'Po-2) I �g� d�u3ng the storm eveuts per Amundson to 36�nch � wa�remc�ved infol�tiol�. 1 ! .�.�.�, ��,�, �� .,.�:� ,^ — ......... .. � '•.......................................... 1 1 4 ' AIQAOORT�S�A.VE. ,1 � _ SEP. 14. 2007 9:35AM'-a1'�ING C0. WLRD'A�KH.1rL LAlVL I�.E'�VUK(,�LIVY�NO, 6712 P. 13 ��, ""'-"°• RAIl�AG� �TIGATION REPOIZT page 1: 1�rvE.snC�,�orr�Qc�Sr � '�'�pe �� PROBLEM: �V" ,`�l � � �`j I � tEc�tvED�Y. r"�' �� Date: � �$ b� OK'd b : �� F�,�,No. � lteceived fram: • � � (�1aY) � (lEve) �1 rr,�: �Gc S �^� rHvr� ZtiS=� �1,� AnDxEEss: � �� j i�c��..° �� City� S Zip Location of problem,if different: , I R'epOrted Problem: CALI,k�ItST �(�rould Like To Be$resent) d�J �b tr� fi✓G�'T"- � � �.c5'Wl I.Y�q �Lt d� � Gt��? ��t �k�!if�.S � � � � �m� o�'� ✓e �E � . r-r� c� � �e ��-vp� c� l� � r �.y-y� �D �j� � �✓1 i/ " �� v �" J `r�/ Y 1 /� �� j, � �� f ` �,,,[� F l/v�'i1 �1� d7J ��e� VV/� �� 1`�j �e�J'� � I GG: �/( �j` � ! , , q �1��' �, �`��il 5.Py G'C�2`r � G'1 �'��n�►C� CC T'��lyl C. r . ✓ Plat z�ame: Lot No: $lock No: dther agencies involved; �To field invesagati�on required (initials) ;- • . . . _ ' . ;�'�T4 BE,�CO]�L'�T�Eb�Y-G0,1�'�.l111;I'��',ItO .GR�►�;97'��-'J�`�`�"�� i'.:'" •,f�� h��'�'•':� 4-. • A/�'. rr 1. .�• �•Y 1 ` :R ,� �ln.~{.��:r � � 1/4 S T R Parcel No. � Kroll � Th.Sros: New � ' � Old Basin�� Cau�cil District� Ghazge No. R,�'SPONSE: T�Cifiizen notified on r 1� z.x 0�' � by: � Phone �� lett�r - in.person�.. �N1,�1�'S �F�M�ti� PRD�s� 3��rl�zd��u�` ��5 r� 6 n � �l�CS, C'��,ft��u� CU�C7SrR�l�rcO,tJ �S S1L�S St��Lf Gd ��d $E" ��'S.SELI ��' d�E,� D�sPosrcYoH: Turned to � on / / by pR: Na furthez�action recammended because: ✓ Lead ager�cy has been not�ified: �� C�.t1��' �`':DU�� Prob[erc, has�een corrected. No problem has been identified, Priar investigation addresses pmblem: s��r,e� Privat�probleu�.-NDAP will riot consider because: V+rater originates onsite andlar on neighborizag parcel. � Location is outside WLRD Service Area. pther(Specify); AA1`E C�,OS�D: /� / � By; �� . SEP, 14. 2007 9 ; 35AM KING C0. WLRD N0. 6772 P. 14 �'�� tt�NO.: 2006-051 S � DEPAR'TMENT OF NA'TURAL RESOURCES ADDRESS: _ ��a� 148°.'Ave._SE, Renton,9$059 AND PARK NAME: Safet Basic WA7ER AND LAND RESOURCES ��NE: (425� 254-0613 DRAINAG� INYE$TIGAYI4N REPORT pATE OF INVESTIGATtON: �9�St 3,2006 FfELD 1NVESTIGAT(ON INVEST1GAl'ED BY:V'uyii Pacampara I wenf tv the site an $/03/2006 at 3:o0 PM to investigate a drainage complaint 1 spoke to Mr.Safe#about his drainage complaint He was aoncemed that during hea�y rain, run-aff frorn roadway(148�'Ave.SE) flowed and entered on to the common access road and some water flowed ontd his driveway and garage.He said that catch basin (CB�1 was averwhelmed by the debris,and water bypassed fhe basin and flaw bowards the driveway.The water flow also overtopped the berm next to CB-B. It was sunny during the investigation. lt appeaced that the drainage system were not adequate to pratect the property af Mr. Basic from flooding during heavy rain. It appeared that the cantrac�or/developer of Shamrodc Heights-1 paved the entrance Mr. Sabic's driveway and appeared to be substandard. tt directs more water to Mr. Basic gar�qe and surrounding area(see the same observation an the e-mail comespvr�dences bet�n►�en Pete Dye(KC-DDES)and Tim Cheatum (KCrDDES, Land Use Services Div.)dabed March 3,2006. Engr. Cheatum alsa mentioned on their e-mail cort�espondences that they wv asked the developer/contractor of Shamrocic Heights�l to reptace the c�evron grate with a vaned grate to captured more water. The cornman gravel roadway that serves the property of AAr. Basic and adjacertt west side properties is part of the Martin Subdivision fvture development(L05P0019).The permit appl►carrt is Cam West Develapment and on review process stage. Mr. Basic would fike the county to fix it or tell him haw he can fix the drainage problem. . .�. . . , . . _ . . _ . . � , . _ . . _ .. _ • • l � • ' � N , � , m ; , o . . : N ; a�sic I �e�� #12601 : NTS �e�op 2 p � � � {��5�orl , , Higher � ' `Od' a�a ; �,'C�� j Q a,��u � ,� eAsic � ; � �c,4[�� : , . � ASphaR pavement paved by � � � .j ,� Shamrodc developerloontrdCto� .�.' � �►°� � per Mr.BaSIt&Engr.Pete Dye ; �•� � (KGDDES)informa5on. — —� . . . . _. . — • - - • — ..., . . _ . . _ . . _ . . _ . . _ . . ^ • �r � •��Yr��q��■ W � `' S'-► ' ,_. � � � 8ertn .' 6-� � �. • B- I ' ii�.._�• �-. .�•� s ractengulsr kd) , � �.. � •�� i��i�rr• a ' T Camrnon gravel ro�d(main sacess of tuhue . i— CB-1. development-NI�1�subdivision) � rectangular slot lid � y� 1 .� •' 1 . :/ R 1 .�Cj �� til '� � �OG g g�a� � ��e�p . � SOIL SURVEY OF KING COUNTY AREA, WASHINGTON Berg-Gacek Preliminary Subdivision ' 563800 ��900 564000 564100 5E;�7'00 ,i;q?i10 �.h44nn 564500 SF34600 664700 564800 564900 565000 5651W :i657(H7 � 4 .,u��' , Y ,�►�''' :51��' +�`*d �+ a.. � ."a�s ' � u�i . M.,.i�� "'y' +�.i ! �'�"»'`,° . � i�" �.<�.��D x ` �� ! e �'��f , ��5� ~ � • � � � o � � � k� � . . + �� o +i��. � �.� �� ♦� � � .�sf. • y, a �Ilr M o �o � 4�� ry�. ` ,,,�$ ��.!. � � � . � � �...' ' � ' � � y-�. I�.. ��,�� *�� l.�r:u; � 'l� r � + k. � ,. �,,;a�� gy � li �R ��. � � , � 1 � 7�� iy��;u�' �, ,�`, �'w"'w � � �,� ;.� ,�"��.��' ,yy .�#� �an'� '�; � � � ♦ �g �' + � � ti °�� '~ � � '! �.d � � } '�>�. V{��d'M .aE�i�1,qr '�• ��.."� c yY.. ,��Kµ '�I . �;. � �n � # ��. aq1�I ` � ♦ ;. �� k '�„��,yR� � �" � �� : • r " w:, p � _ + , �. y t ' � � �( } � �. . � , . .. � �t" � � �uY � �, �"�,d ,� .' ,,�' " P _� � . ,��r��"• � � , � � �.� ,:,� �c .� �.. « �,. p�� D 'o ��y{ V�� h t' .. ui &",y � ��,.�� . r M� �` .� �.� �' ��Y � � in `n ..`� 1 y 4. ��d� ta �{`.,� ��..+� . »,. '�' ��T«' y w ..��,y ,. .� .i1 � �r� t 'e. � �a�'.�� ; ~ ■ `�i!dd �'� ' � t 1 7 � »��. � ��r' ' 4v{;3�.�.`"� :: / �� r `�e N o . ♦�k +,' ��11f� `��s�� :�' .,�' o � .� � "y� � w: �- �'�� . � .. �r�i ;•r, •,� . �` #�` �Wa`��tirf�t '�' `� -n . ,�"� y� �•+ , .a '91,s,� �7�,� � 9-. . � � �� . � � ��' `� x��,�C� � *; M +�r+Fs � . � � s` ��. � �, ; �r � �. . , �� ,� � r. '� Mp ` �;y�, �" r' '�F» �". � fi � . � �i � I � �'.: � �. .. r r -r� , � o ,. u� �� i' � r � �*.�r ru �R �,.�^' � �i� � fn � � . �.,,��d�..�' .,� � .:a° p ��' � �, � � ,. ¢k � x ~�t�,. �`�j � M1''�� Y � � '� � � « „� � � � y � y' "'� �'� � v � , . � + ! �� • �'' � `� � "� ,��"'� ' � '�' ��S�� ' ,� . ' ;�"° � ' u, y. ;� r . , .�� , � r �; �, �, � � Y �. �u 4 � I. �. . � .. . � � . � . a 114 � !� � �� . ,�yy} � .� H �' .t. 'qf`� �, � ZI�f� � �t «'. '�� O � � it' �N.k y ... r '�^ eYY'1�' ws�,. '%,,'; y. � �rt � .� piw��,� !4 T� �, t'"�[.ildk��4 ' � '�� b✓ u, II � � �,, �) �, 1.. " � yr� �•w„�%�'�` ��"+ ,'r'fl. � !� q�,� .�� ' �� . ' R } 'b� .F' i` ,�� I ;r. M ' ; ` o ,� n� ^ � �. , . .�M � k . � r� ,� o 0 � � w . . ,. �' C�a, ` � ,�� ,� � � � � �r6��`e.� �"" � � . w � ni; r,,, r� � .� . ,��` -t M. s-, � � ` � -�,�, �;�' .'„�,vu %_��W 5ts4(]n;; '�F�,:�_.. �U._„_ ,,.,.... 564400 564500 �qt,u� i,�r1;1)t; :P.7Au;, Fa-,q4t.io 565000 565100 565200 Meters Feet "'�` 0 50 100 200 0 200 400 800 1,200 1,600 USDA N■�urul Resrwrces Web Soil Survcy I.I 4/4/?Q07 � CaicervatlonSenice Naliunal Cooperdtivc Suil Survcy Page I of 3 SOIL SURVEY OF KING COUNTYAREA, WASHINGTON Ber�Gacek Preliminary Subdivision �� MAP LEGEND MAP INFORMATION ', Soil Map Units o ca+� Source of Map: Natural Resources Conservation Service , 0 ��i�a co�M�eg Web Soil Survey URL http://websoilsurvey.nres.usda.gov , Q Delailed Stffies � Interstate Highways Coordinate System: UTM Zone 10 I Roeda Soil Survey Area: King County Area, Washington � �� R�'�g Spatial Version of Data: 1 �, �ef Soil Map Compilation Scale: 1:24000 i Hydrogrephy Oceans i A�A�A�A� Escarpment,bedrock ; ��^� Escarpment,norrbedrock � � � � � � Gulley � wawuuai Levee ........ $�apg i I v Blowout I , � Borrow Pit � � Clay Spot ♦ Depression,Gosed � Eroded Spot x Gravel Pit Grave�ry Spa Gulley , /� Lava Flow ' � Landfill Map compnsed of aerial images photographed on these dates: �. �u►arst�or swamp 7/10/1990; 7/18/1990 � � Miscellaneous Water ' v ROCk Outcrop + Saline Spot � . . Sandy Spot ' ;� Slide or Slip G Sinkhole , m Sodic Spot �! � spoii a,rea The orthophoto or other base map on which the soil lines were compiled and ,, o ��,y S� digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. O Perennial Water USDA Natural Resourcec '� Wet Spot Web Soil Survey I.I 4/4/'_U(17 r fooservatlon Senice National CouperUive Soil Sun�ey Pagc 2 of'3 Soil Survey of King County Area,Washington Berg-Gacek Preliminary Subdivision �I Map Unit Legend Summary I King County Area, Washington I, Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI �� AgB Alderwood gravelly sandy loam, 46.6 15.9 0 to 6 percent slopes ' AgC Aldenuood gravelly sandy loam, 244.7 83.3 6 to 15 percent slopes AgD Alderwood gravelly sandy loam, 0.3 0.1 15 to 30 percent slopes Bh Bellingham silt loam 2.1 0.7 �J$py� M1amral Resoeces Web Soil Survey l.l 4.14,'2007 �coosma�ka s�r.kr National Cooperative Soil Survey Page 3 of 3 CP H CONSULTANTS _ � _. .� . _. : ._. . _- ...� _._ .. _.� _ _.. __ _._. - .._� _. _..,:_.. _..�. $ECTION 3.2 SITE SOIL CONDITIONS � Site Planning Civil Engineering Praject Management land Development Consulting CP H CONSULTANTS $ECTION 3.3 DOWNSTREAM ANALYSIS �,ite P�a��ri�q (ivil Engineen Project Manngem� Land Derelopment Consuh �s��suJ F11IO60J i'��0603 "F�"'�°' 148th AVE SE .,�� a;�, ��,�-,. �, �� i � � i , U � � � 2 � � � o � ;� w �, o z z � � �;,� � �! � � �,\ ., .�� , � '�`\� \�� \— � \' ,, � \ �1 � \ � �,�� , � � d1 . � ,,, �,\, '�, i �—P - w �\� �.� �� M � �� `� !�`�� o � m ` � � � � �, � � o �''� Q � N _ '� �� 1 '�\\\ U � — \ _ � �--.,,�. �-.` ' �` (� _ _� � 0�0 � .�� — _ , � . _ �1 � w • - � z r 1 - � ! �, � � DETENTION PON D ��-.�.._ .,� � A � o , - v o , 9 4 ' � �� a � ` ` � �, \ `�� \ 1 M J Y + s = a -�� y -� N n,� � --� a � • \ c _____� � � �� JERICHO PL NE ,;}�� ~� � `�� a 1(� \ � J , Q ¢ _ - � o = � _ � o � � I LWACO P L N E w � � z , � = I LWACO PL N E � ~ i � � � � � � � � J w U , = U � � � a- —� z 2 ' � 2 � I� � � pp w ti i Z 3 r-I p w Z w ' I z z I Db�N ST2Eft Y�n �jCµi$�T o w `� ' b �. Z W Z ' � OwNER/ RICK BL'RNS'EAD CONSTRUCRpN COMo.4NY � NO. DATE REYISION BV � CK �'� 119�NE 24th ST, SUiTE 200 BE�4L�, A'A 58005 � 7.i P � � PrrpNE: (a25J s54-19DC I 1`I o C 0 N S U L TA N T S '�2oisaw PREL1MIhARY$UBDN610N API'LIGTqN cn, ,as FAX: (425) d18-7369 7/20/7007 REVISEDNCCJMNEM /gg �g$ PRQIECTSURVEYOR yEAO G7LMAN k A,iSCClA'ES O y''�'�'��"� P.O. 80X 2B9 U h��'��"'y�� MDODlNNLLE, W4 98072 y � Z� � ra3imma.�.xs�r izo PHONE: (425)186-1252 •� K.wc.w�veaa3 P+mc��25��a39c SULE PROJECtNO. SHEET ��s��=s��, AS NOTED 0011-06-003 a PLAN IN FEEf � �.e�o x w...�...c �.�a� i . OFF-SITF. ANALYSIS DRAINAGE SYS'I'f:M TAI3LE �IIIZFACF WATER DI:SIGN MANUAL, CORF, REQUIREMF,NT#2 Basin: Cedar Rivcr/ Lake Washington Subbasin Name: Mav Crcck Subbasin Number: A Symbol Drainage Drainage Slope Distance Existing Potential Observations of field Component Type, Component from site Problems Problems inspector, resource Name, and Size Descri tion dischar e reviewer, or resident see map Type:sheet flow,swale, drainage basin,vegetation, % Y.ml=1,320 ft. constrictions,under capacity,ponding, tributary area, likelihood of problem, stream,channel,pipe, cover,depth,type of sensitive overtopping,flooding,habitat or organism overFlow pathways, potential impacts pond;Size:diameter, area,volume destruction,scouring,bank sloughing, • surface area sedimentation,incision,other erosion Al Channcl/pipe flow Flow f'rom wetland from 0.5-1 Onto Standing water Ylugging Uvcrflow pathway through 12" & 6" CMP Shamrock I Ieights site/soutli PL onsite wetland A A2 Channel/pipe flow 12" CMY 0.5-1 West/central Submerged pipe Ylug�ing Connection of Wetland A to 12" CMP on sitc Wctland B A3 Concentrated flow Vegetated watercourse 0.5-1 0-200 f't None observed Sedi�l�entation, No problems observcd (stream/wetland) scouring A4 Culvert crossing Continuation of vegetated 0.5-1 �202 ft Standing water Rackwater, Lar�e number of new tree fall 18" CMP water course after pipe plugging in general vicinity AS Concentrated flow Vegetated watercourse 0.5-2 �203-(50 ft Standin� water Sedimentation, No problems observed (stream/wetland) scow•ing A6 Culvert crossing Continuation of 0.5-2 �650-660 ft Submerged pipe Backwater, Large number of new tree fall 12" CMP intcrconnected wetlands plu��ing in �eneral vicinity A7 Concentrated flow Vegetated watercourse 0.5 "1'o east�180' Standin� water Sedimentation, I,arge numbcr of new tree fall (stream/wetland) minor distance scouriug in �eneral vicinity to north A8/B2 Culvert crossing Continuation of .OS-2 �705-710 ft Standing water Backwater, Large number of new tree fall 12" Conc. interco�uiected wetlands lu > >in in eneral vicinit A9/B3 Concentrated flow Vegetated watercourse 1-2 �710-1510 ft Standing water Seditnentation, No problems observed stream/wetland scotirin A10/B4 Culvert Crossing Culvert under NE 10" 1-2 �1510-1550 ft None observed, Backwater, No problems observed 36" ADS Street flowin £reel lu 7 7III 7 ;��u� OFF-SITE ANALYSIS DRAINAGF. SYSTEM TA[3LE SURFACE WATER DESIGN MANUAL, CORE REQUiREMENT#2 Basin: Cedar River/ Lake Washington Subbasin Namc: Mav Creek Subbasin Numbcr: B Symbol Drainage Drainage Slope Distance Existing Potential Observations of field Component Type, Component from site Problems Problems inspector, resource Name, and Size Descri tion dischar e reviewer, or resident see map Type:sheet flow,swale, drainage basin,vegetation, % '/.ml=1,320 ft. constrictions, under capacity,ponding, tributary area, likelihood of problem, stream,channel,pipe, cover,depth,type of sensitive overtopping,flooding, habitat or organism overflow pathways,potential impacts pond;Size:diameter, area,volume destruction,scouring,bank sloughing, surface area sedimentation, incision,other erosion B1 Concentratcd Flow Flow from wctland from 0.5-1 �0-(50 ft Slow moving Scdimcntation, Pathway of Wetland C onto (wetland) �nsite wetland C standing water scouring E. Renton Wetland C B2/A8 Culvcrt crossing Continuation of .OS-2 �650-660 ft Standing water Backwater, Large number of new tree fall 12" Conc. inlerconnected wetlands plu��ing in general vicinity I33/A9 Concentrated flow Vegetated watercourse 3-4 �660-l 510 ft Standing water Sedimentation, No problems observed (stream/wetland) scouring B4/A10 Culvert Crossing Culvert underNL 10` 1-2 �1510-1550 ft None observed, Rackwater, No problems observed 36" ADS Street flowing freely plugging �uo� I v`D�In y L �Berg- acek)Preliminary Subdivision �i y.�� 9196 0060 Jp6.i SE ncPi 9T D�yrt `-�`-�'1= 4E 11TH ST Z 91 t'; y20? '�J07 `-�0l3 �ui;! pp;d .,;�„ d �,�,;, � y�� 93dT �� 4E 10'TM Pl J � _�_t��i �� 93�3 y�5{ 915{i `-u.J�6 � y.i6! u36_� 9365 9381!+rn np'�� 936� f J�5} 9151 �i�i'S > � 93J0 9?% 915+ � 9:366 � yj�� yb �1 tdT�r ST 0?9S = 9pgp l 93•T! ri�y`� ri�y, } Y3�ti y35/ ch J7yi� yl�d 7 if 0'9Y p.yN 0','Z 'i7�3 .i... r y:�s�r z _ 'E'�'T'+s7 YOyJ � � J . w o+so a y3YD � SE itETN ST � ui td yS3; � `_�'�� y3/: ! `�=:0 ril jrl y2y3 ��i 0115 i 92'� YC�23 yrult y=•T6 ! `�`,` . . 71'0 ` S512JP�ST _,�.-- .- y!6� } tiFgi i r y066 ��•:i�� i y�ib, y,ij,� y'64 yJ9J SK�F�6 y�� - �.e...y.� ♦ z y� y�i t� � �_-._._ �� yi�8� y0i1 �%� �' �� Renton �� y=�'�� y:•+' �I� -:��'� ` � 9350 yryg 93�5 y'_�8; i11i:'---.=s � ��t � . �' �i/y0 R �� \ U��, +i{p 1060 ��dJ �� `.; �` - 0/.;0 OiiOU ?030 �' - � c� 0;60 0810 "�10 "-�� 9"'S9 y�� 01•}p � ,n \`ur/' 0;50 Od3U r 7p,ri ?OSU � K,, �� ♦ � J860 ypy:x:..:�� a � ��,\\�' `-' � 0850 '_�ygp 7 7'Jo .$ NVIR r � � oyau ao ,,;_; �, � �� ,� ;., . . ',� � �` \ 4 � Oy6J � �SE 127R;'ST ; �`�i y`�`�`91:? ^ a ri93i� � �6� � . ,�`�' 0}S'J,�(4��'y'� � ♦ ry . � � : �� 'JUIy .,.: �'.,�"XXX �ti} wt��, '9;1,� yJ•iY ' ��` •l, y`-�'6 �p�C"- �0.10�� _ � � � `�''0 . ��'J9�(] �. tiF � �. .i_;, � .9196 -b' � \.� 9U/5 \. P,�• i =.;w�. 933y ♦\ \ \ \. . . �� tN: ��c� "i;.i;t y�yf � y1ff4 \ Vi6T•�5T � �i � � �y':'�` y0'0 i.� ��4( i .:�'i � � � \ C!'J. � z '1 - yU'b, y�yp \ � \� \ \ � `'` . � 1 SE l2aTN S7 ft� VE8'T��ST _. _ _.� j...I� � 927! �\y`�j \�\Gd \ \, `�. .\ � � �\, \\` _ � _y _- �� = r� � \ `� � � �J7fs_ M �i��r� 9298�. � � � y�i.fl tS. � � � ,:Ci� ��:GU i Q ' ;r��, ��.71 �Y.B; . \: SEt2fTiw�. � i,ri � \+� c�. n _." � 926�\ � �\ \ \ .� \ ♦ ♦ � ��. � �3 w 058C _i�'_'„_: \�♦ ♦ .�ti��H�- �. � � \ \ � � . �,`� � 4 . U15U 4� z 0590 � n� � u ��.�u�; � 9Z51��w�,1. . �� .i i � \ � � ��- y�\ �► � U60p a� . � \ • \ \ `��, \93bS �♦ O,ru�� '�i100� �� y T ,J `-i.�.;. �S 91\'\ydSS • ` :�380 ti� � \'� ._i'j8ri � `� � � � �\ � � �\g� �� \` \`��` \ \�' ysds yus�, \ � � � � fi� � 4L TN ST�. .,` -1 ._ \ � � a �i.�n,i \ \ ♦ � \� \ y3t' .\\y`-r�? \ ♦� �\ t O 4 4 \' ` \ \ \ 'r�rl�_�\ � � � ` . \ � � � � i �n t, i r�' � . \v�ST��5T ri.{.t�i •� . ♦ �� \ � ,� � \ � �'��_` ��i;;0\ri3S0\'�3+p�`, y��'��♦ \ \\\ \\ � a y��; � ` \ ,� ., `4EaT�iCT . . � . . . , �� . � �it �i •\ � �\, \ � `T � IJ1 , \ � � ,d• ,' •� \ \ \ \ Z� � 1�1'I♦ y E+:. � `` � \��\ �� ♦ � ♦4+� \ \ � T, ij.p .i, �z � �(� \ 9`-��' \' \ \�\ ,�b;,� ri.f_:J ♦ � � a � �� \ \ �� r�310�y..9, 4 � , i. n 0.�,-� .` � \ �G?3U\O, a� 4�� ` t . ' �. � ��,� �� Ol� \ `68. �. , � .� � �Q � � � ��Y � �N �\�•�y?91 z . r,\. 'vExTMa` \ ' t_;, ` � � J• \ � � � \ �.`i�90 �79j�.J• � . ' \ � � \ � ' V_sT��- ` ,` � , • . '.Sd \ � �ic \> `\ � 91Jy� �_ � u„6, � � 1 , � ,� , \'\\'�"•' � \ \\z. 9!?2� . �_ •.` �\ �� \ �♦ �• \ . �_t. u�� ' \ �` .t.�iri ,-��•;,i \ \ �ri_.� . 9. 6.9f08 - � � '� �� \� �� \ \`- . � � � •y,,,�, , � �` ` ` ' 4 � 9106' Y'�'• \ n;._i {CI�5 Kmq County � � � , � N_4CH�f.,` � ♦ ♦ � 0 561.it � i The inforrnation iuluded an tlds map hes been comptled Dy King County staft from a variery d sources a�d is wbjecl lo change withou[notice.Ki�g Cowriy makes no ropreeentatio�or wartaMies.express or implied.as N accuracy.compleleness.timeliness.or rights Oo the use of wch iMormatio�. This dowrtient is not iMerWed fw use es a wrvey product.King Counry shall rqt ba lieble for eny general,speaai �ndirect,'r�ddeMel.or consequential a damegea induding.but nol Ymited to.bst revernres or bsl profits rosuttng hom Me use or misuse of the iMameUon contaned on this map.My sab of King County this map a irtfomiabm m tl�is mep is prohibited e:cept by wntten permiss�on d 14ng Counly. Date:4/4l2007 Source:King Counry iMAP-Sensitiva Areas(hGp:l/www.metrokc.govlGIS�SMAP� F�9u.rQ, lfl : Sex�a��ive, Rreas Mo,,Q Q Q� Berg-G cek reliminary Subdivision Legend , �_� County Boundary , 5treams �o-N ,, � Mvuntain Peaks � Floodway ;� Mod,�m , Nighways ""'? 1D0 Year Floodplain -` ��h �, ��1 �f Incorparated Area Channei Migra6on Hazard Area s 5treets N�ghwap �� MODCRATC rt Anaials SCYCR C �°`� � 5ole Source Aquiier Parcels � 5A0 Wetland �f Agricultural Watervvays lT � SAO Landslide Wildlife Network __ _. - 5A0 Caal Mine 5A0 Stream �� SAO 5eismic � C tass t 5A0 Erosion � C tnzs 2 Paran a u1 � � Chinook Distribution C tass 2 S.ilmon W � ■ 5ensitive Area Notice on Title C tass 3 � Drainage Complaints , Unctass�f�ad � Lakes and Large Rivers Areas 5usceptable to Graundwater Cvntaminatian The i�ortnation included on tMs map has bean com0lbd hy King County stafl from a variety of souroea and is subject to change witlwut rotice-iGng CouMy makes no rcWesenlations or wartarrtias,express or vnplied.as to xwracy.compbteness.Grneliiess.a rigMs to the use of such infmnation. This dowmeM is rot intended tor use as a wrvey poduct Kirg CouMy shall not be liable fa any general.special,ind'rxC inddentel,or consequential a damayes induding,but not Amited W,bst revenues a bsl profits rosuRing from the use w misuse af Ihe iMormation oontained on this map.Any sab of King County this map a i�lormatlon on this mep is prohibited exoept by wrilten permiaaon o1 Kirg CouMy. Date:4/M2007 Soirce:King County iMAP-Sensitive Areas(http:l/www.metrokc.gov/GIShMAP) Delaney Park Subdivision Technical Informafion Report SECTION 4 - FLOW CONTROL AND WATER QUALITY ANALYSIS AND DESIGN The hydrologic analysis of the runoff conditions for this project is based on drainage characteristics such as basin area, soil type, and land use (i.e., pervious vs. impervious). The King County Runoff Time Series (KCRTS) software was used to evaluate the storm water runoff conditions for the project site and to design the on-site flow control facilities. The following is a summary of the results of the analysis and the proposed drainage facility improvements for this project. Existing Site Hydrology Currently, there are 4 existing single-family residences, garages, barns and other various out buildings located on the site. The remaining ground cover consists of pasture, residential landscaped areas, or wetlands and associated buffers. The topography within the on-site basin tends westerly towards several wetlands at slopes of 0 to 20 percent. The proposed on-site detention and water quality vault was sized using KCRTS. Historic site (i.e., fully forestedj conditions were considered in the analysis of the pre-developed conditions for all on-site targeted developed surfaces in accordance with KCSWDM standards for Conservation Flow Control. The portion of 148"' Avenue SE which contributes runoff to the proposed system was considered to be impervious in both the existing and developed conditions since it was constructed prior to January 8, 2001 and is not considered to be new or replaced impervious surface. Table 4.1 summarizes the Basin areas and KCRTS input parameters for the existing (i.e., pre-developed) site conditions. Table 4.2 shows the resulting peak rates, and Table 4.3 shows the resulting peak target Table 4.1 —Land Use Cover, Existing Site Conditions Basin ID Total Area Land Cover (acres) (acres) Impervious Till Grass Till Forest On-Site 4.67 0.00 0 4.67 Off-Site 0.15 0.15 0 0 Table 4.2 —Flow Rate Summary, Exisiing Site Conditions I 2-year Peak 10-year Peak 100-year Peak Sub-basin Design Flow Design Flow Design Flow Name Rate (cfs) Rate (cfs) Rate (cfs) On-Site 0.1 30 0.226 0.377 Off-Site 0.037 0.044 0.071 * Section 4.1 of this TIR contains the KCRTS model inputs and results. CPH Projecf No.001 1-08-006 May 1 2, 2009 CP I H CONSULTANTS Page 14 Delar►ey Park Subdivision 7echnical Information Report Developed Site Hydrology The site will be re-graded and existing services/facilities will be extended to accommodate the new single-family residences. The grading efforts, and associated drpinage collection and conveyance systems, will generally maintain the existing discharge patterns of the subject site and neighboring properties. Figure 6 shows the proposed grading and drainage improvements and sub-basin delineation for the developed site. Fully developed conditions were modeled using measured and land cover standards established by the current King County Zoning Code. All lot areas were assumed to be 55% impervious and 45% grass, with the exception of lots that will have roofs dispersed to the wetland buffers using allowed dispersion techniques. There are a total of 4 lots that will have dispersed roofs. Each dispersed roof was assumed to have an area of approximately 2,000 square feet. The roof areas for these lots were modeled as 50% grass and 50% impervious. All other on-site areas contributing to the storm drainage systems including roadways and sidewalks were measured. Tables 4.3 and 4.4 summarize the land use parameters used in the hydrologic model and resulting peak design rates respectively for the different sub-basins under develo ed site conditions. A summar of the im ervious area calculations for the site P Y P is provided in Section 4.1. Table 4.3 — Land Use Cover, Developed Site Conditions Basin ID Total Area Land Cover (acres) (acres) Impervious Till Grass Till Forest On-Site 4.67 2.66 2.01 0 Off-Site 0.15 0.15 0 0 Table 4.4—Flow Rate Summary, Developed Site Conditions I� 2-yearPeak 10-yearPeak 100-yearPeak � Sub-basin Design Flow Design Flow Design Flow Name Rate (cfs) Rate (cfs) Rate (cfs) On-Site 0.824 0.994 1.68 Off-Site 0.037 0.044 0.071 II * Section 4.1 of this TIR contains the KCRTS model inputs and results. I Performance Standards ' Storm drainage facilities for this project are proposed to provide Conservation Flow Control , stqndards in general accordance with current KCSWDM Table 1.2.3.A. On-site water quality treatment facilities are required for the project according to section 1.2.8 of the KCSDWDM. Table ', 4.5 summarizes the design criteria for the on-site storm water facility. ', Table 4.5 - Performance Standards Facility Flow Control Standard Water Quality Treatment Standard On-site Vault Conservation Flow Control Basic Treatment Facility , i CPH Project No.001 1-08-006 May 12,2009 CP I H CONSULTANT$ Page 15 Delaney Park Subdivision Technical Information Report Flow Control and Water Quality Facilities A standard flow control riser is proposed at the outlet of the on-site water quality and detention vault to control the release rate of storm water to the off-site, downstream systems. The size and number of control orifices on this riser hpve been designed to control the on-site release rpte to pre- developed site conditions for the 2-year and 10-year storm events as well as matching developed durations to pre-developed durations for 50% of the 2-year event up to the full 50-year peak flow. A portion of roof drains are dispersed to the wetlpnd buffer using basic dispersion techniques, and the areas were modeled as 50% impervious and 50% grpss consistent with table 5.2.2.A of KCSWDM for facility sizing credits. Basic Treatment facilities are required with the developed project site. Due to topographic and aerial constraints, permanent wetpool facilities will be combined with the on-site detention facility to achieve the water quality treatment standard. The minimum required wetpool volume is calculated as the runoff volume for the 6-month, 24-hour storm event. This water quality volume was calculated using the equations provided in Section 6.4.1.1 of the KCSWDM. Copies of the wetpool calculations are provided in Section 4.2. Tables 4.6 and 4.7 summarize the calculated design water quality and detention volumes for this project. Table 4.6 Water Quality Volumes Facility Minimum Required WQ Volume Design WQ Volume (cu ff) (cu ft) On-Site Vault 56,500 57,024 Table 4.7 De�ention Vault Geometry Design Min. Required Design Detention Facility Detention Detention Volume Volume (cu-ff) Depth (ft) (cu-k) On-Site Vault 5.0 14,742 15,840 The basic treatment facilities that are proposed to be on-site are a series of dispersion trenches. There are two dispersion trenches proposed to be located on the site. Dispersion trench 1 will disperse the runoff generated by the impervious surface and back-yard of Lot 14, while the second dispersion trench is designed to disperse the runoff generated from lots 1 1-13. The impervious surface for the dispersion trenches are summarized in Table 4.8 and broken up into individual lot calculations for each trench. Table 4.8 Dispersion Trench I Confributing Impervious Pervious Area Dispersion Trench Facility Lots Area (sq-ft) (sq-ft) length (ff) Dispersion 14 1,822* 3,703 26' Trench 1 'I Dispersion � �_�3 6,000* 0 86' total Trench 2 8� 3 *Designed for the roof drainage,the remainder of the lot area will be collected by roadway drainage system CPH Project No.0011-08-006 May 1 2, 2049 CP I H CONSULTANTS Page 16 CP H CONSULTANTS $ECTION 4. 1 HYDROLOGIC ANALYSIS AND KCRTS MODEL RESULTS Site Planning (ivil Engineering Project Mnnogement Lond Development Consulting Delaney Park Subdivision Flow Frequency Analysis King County Runoff Time Series Resulfs Time Series File:off-site.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.036 7 2/09/O1 2:00 0.071 1 100.00 0.990 0.032 8 1/05/02 16:00 0.054 2 25.00 0.960 0.044 3 12/08/02 18:00 0.044 3 10.00 0.900 0.037 6 8/26/04 2:00 0.044 4 5.00 0.800 0.044 4 10/28/04 16:00 0.039 5 3 .00 0.667 0.039 5 1/18/06 16:00 0.037 6 2 .00 0.500 0.054 2 10/26/06 0:00 0.036 7 1.30 0.231 0. 071 1 1/09/08 6:00 0.032 8 1.10 0.091 Computed Peaks 0.065 50.00 0.980 Input: SeaTac 1.0 1 Hour Reduced 0. 15 ac Impervious CPH Project No.001 1-08-006 Page 1 of 1 May 12, 2009 ' Delaney Park Subdivision Flow Frequency Analysis King County Runoff Time Series Results Predeveloped Flows (Historic Conditions, Forest) ' Flow Frequency Analysis Time Series File:predev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Fnalysis------- � Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob � (CFS) (CFS) Period 0.295 2 2/09/O1 18:00 0.377 1 100.00 0.9°0 0.080 7 1/06/02 3:00 0.295 2 25.00 0.95Q 0.219 4 2/28/03 3:00 0.226 3 10.00 0.90C 0.008 S 3/24/04 20:00 0.219 4 5.00 0.8�� 0.130 6 1/05/05 8:00 0.191 5 3.00 0.6�� 0.226 3 1/18/06 21:00 0.130 6 2.00 0.5: 0.191 5 11/24/06 4 :00 0.080 7 1.30 0.2: 0.377 1 1/09/08 9:00 0.008 8 1.10 O.0 Computed Peaks 0.349 50.00 0.9 Input: SeaTac 1.0 1 Hour Reduced 4.67 ac Till Forest CPH Project No. 001 1-08-006 Page 1 of 1 May 1 2, 2009 Delaney Park Subdivision Flow Frequency Anolysis King Counfy Runoff Time Series Results Developed Flows (proposed development) Flow Frequency Analysis Time Series File:dev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.824 6 2/09/O1 2:00 1.68 1 100.00 0.990 0.660 8 1/05/02 16:00 1.02 2 25.00 0.960 0.994 3 2/27/03 7:00 0. 994 3 10.00 0.900 0.700 7 8/26/04 2:00 0.874 4 5.00 0.800 0.846 5 10/28/04 16:00 0.846 5 3.00 0.667 0.874 4 1/18/06 16:00 0.824 6 2 .00 0.500 1.02 2 10/26/06 0:00 0.700 7 1.30 0.231 1.68 1 1/09/08 6:00 0.660 8 1.10 0.091 Computed Peaks 1.46 50.00 0.980 Input: SeaTac 1.0 1 Hour Reduced 2. 01 ac Till Grass 2. 66 ac Impervious i CPH Projecf No. 001 1-08-006 Page 1 of 1 �� May 1 2, 2009 I I CP H CONSULTANTS FIGURE 4 EXISTING SITE CONDITIONS I� Site Planning Civil Engineering Project Monagement �and Developmenf Consuhing ; _.. _.. . -. _ _ _ _ _ __ _..... —_. � � , � ; _______ _.�. _ >*''�"'�� r �' '�a.;�"t+�"�""�."-::,x.rir:. : _ _:_ ... _ — __ : } 3'�...... � '' � \i ♦ �;1� � d. 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'� \ - �I .' • 0/}�I A ER�IION �C�! 8 S �Lb�VAULxUAPERNBpU�S2 � 1 \`� � �'m� i` �..^ _._. , rtE Sos + i i i . r _ _ ..� ,� {__-->_�,.'. . . � -i I�, �uPER4)OlRS� 0.19 ES . � - / `� ' ' 1 � - I EFFECTIVE`IIYP=0.14�1 S ' - � � '�IYRERNOU� 0.68 A02T � .. . __ '__,---T . __.... ... _ �i1 1� �-.� TOTAL� �.88 ACRE ��.\ , , .I � :TDT)IL� 7.�ACRES . � '��M f - , . . . �� -�. � �- ,;I I � . . i'/ ��•/r•�- • •WEILAND C' ' �. y .:'� �� 1 8 � � � � . � \ �I . I . ±�� ' ! I OfFSIIE TOTAL ARfA: OJ5 i ( ' '.'15,06fi"sQ.It, . " "j -.. � � � � ��.' \ , wPERN0U5 AREA: OJ5 7 v� � \_••/ �`� 1 . . . �l i. ,� � \ \ � �i i I�. I++ ' I PERNOUS AREA 0.00 L w U . '\ �' ` ' ' ' I I \ � � - ��;'3- ��n+?��__ _ F+��L �i- _-�' �+ � � NfW IMPERNWS 0.01 � 1= \` �" t, � \O � 4_ . .... . . . , • O � �_ I ,\ . . . • . ��, . .�. — 'R � .�:' . . . .: ) { - . . �. . . . . � � _ . ... .__�_-- �-- . . . . � _ � . L�'� �,�,�,` � � -------- �s ___ -- �, , � •. 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J � i a p I � O N 9 7 E Y A�T S� ! .I E I iI '_ / , / � � i. --�'-""'-�"'-�'-"-"-^' 'r � � u � , � ° � ¢ � �� 5 �: j ; � � a � ! I � Z z �� " � �n�a�rrvKws aa��tr� �l I�� i �g� 1 ,I � � � � � 'I ✓;/ % }yE'��NpJ4 , � :� - , I ,I I li j T�JiAI� 1. ACRES jl � � j � I + .. m ,. � � / , _ � - � r, � � ' - - —"'� � 1 - - ` : R,+i c j� , '% %' I �' `G __ - - � 00 , , � I � , , �I � � c : . . - ' ' ;1's^ .'�_ � - - � � � ` ..j� �. I � ', z � � J: 1�' �' � i u � E ' � . •. .. :.... :. . . . , :� ; t I �� ; � W J � - . . . ` ' `• .• - - ;-_•.•,•_• •_• , . . . . _ - ,.1--i1_: , . . . . . � , z __; , E ` �� '.'."." _ . . _ U - • . . _. . . . . . . _� s . . . . .�._--•�. . _ _ . �� _ _ __ _ __.. J � > -- - . � �� --�- � � � � � � `-�Y S-h�U i'�K .i�, • 2 O o � { � I: , �" '$ ' € I w V � :. ir� ...�. �s- �'- _ , � �n W z . � , • _ -, ''"" Ii t>. I •�C. V "� � F- Y . . .r>;- e�§� .� i „i: I �2:''t�.'%f,. i ?f i..�; ..._.._ /— ".__.__ '-' • - �.\ 7A�'y;;." .� ��(�' t ��___- _ ' :y�. f ± ,`�\. :� . ' '-_ �,� . r�� ' I I CLIINT . . . . . . . . . . . . . :�., i :, ��. . . . . _r � t t " _'_ , ; c`:•�-�•"-�-�•�•i. �. _ ------- --- _...----- -- I � � �'� RICKBURNSTEAD ;i , v ' � - --. .__. :l '; -��'.'-'-'<� � \ ' �'.L_;i � �� ; ; � CONSTRUCTION(:0. ---- � - - - --- j - - �._ ------ �� . ��' ---- ----` -- � 980 NE 24TH ST,SUfTE 2 � //_•_ ' �� ._ ..__.__.__ "__� . i � .! I�t( * ��'( il BELLEVUE.WA 9800r � i " , � y_•_' ` ` � '� �• � F ( ) 1&7369 ___..._ ______ ', -;._ :� . . . .' �/ � � . . . ___`_.- . ,., i . ' _____.,._�.- . � i � ' ---.___._�,__.__. --... -- _ � . T-�---_--_----'�--- • .. _� .� ------ � � � �� . ., —`- ------------ '. I� � � ` "_ . ___ -_ ____' �'�i �� --- --- --�. � __ ---------=-- --___------- ---- _ .._ ___ � . _;_ ; I CONSULTANTS ��•�� ryu�.r.rirr+r.� rsv�nw...,w�ao �ar.�aw�woa nnnc 1tx5t�rd7o f�1c1�1�7]i � PROJECTNO. Q7tNdBQ0l9 �^`�'� `�o�oa� �� FIGURE 6 o so wo ;`�>�� ,-soa�sa.ssss HORIZ IN FEET - o�P�ev,,.m CP _ �� _ ._a � s � � � $ECTION 4.2 FLOW CONTROL AND WATER QUALITY ANALYSIS AND DESIGN II Site Planning (ivil Engineering Project ManagemenT Land Development Consulting Wetpool Volume Calculation Based on King County Surface Design Manual Delaney Park Subdivision (KCSw�n4,2005) ersection 6.4.1.1 Area oF impervious surface: Ai:= 1 15974ft2 Area of fill soil covered wifh grass: A�9 := 86495tt2 Area of fill soil covered wiih forest: A�:= Oft2 Area of outwash soil covered with grass or forest: Aa:= Oft2 ' Rainfall from mean annual storm: r:= 0.039ft Volume of runoff from mean annual storm: Vr:= (0.9•Ai + 0.25•Atg + O.lO�Atf + O.OIAo)•{r) V�= 4914 ft3 Volume oF Required Wetpool f:= 3.0 Vb:= f•V� Vb= 14742 ft3 CPH Consultants Project No. 001 1-08-006 3/3/2009 wetpool volume.xmcd Page 1 of 1 Retention/Detention Facility Type of Facility: Detention Vault Facility Length: 132.00 ft Facility Width: 48.00 ft Facility Area: 6336. sq. ft Effective Storage Depth: 9.00 ft Stage 0 Elevation: 455.50 ft Storage Volume: 57024. cu. ft Riser Head: 9.00 ft Riser Diameter: 18.00 inches Number of orifices: 3 Full Head Pipe Orifice # Height Diameter Discharge Diameter (ft) (in) (CFS) (in) 1 0.00 1.00 `� 0.081 2 5.80 ✓ 1.50 � 0.109 4.0 3 6.30 � 1.25 ✓ 0.070 4.0 Top Notch Weir: Rectangular Length: 1.00 in weir Height: 8.30 ft Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation (ft) (ft) (cu. ft) (ac-ft) (cf s) (cfs) 0.00 455.50 0. 0 .000 0 .000 0.00 0.01 455.51 63. 0 .001 0 .003 0.00 0.02 455.52 127. 0 .003 0 .004 0.00 0.03 455.53 190. 0.004 0 .005 0.00 0.04 455.54 253. 0.006 0 .006 0.00 0.05 455.55 317. 0.007 0.006 0.00 0.06 455.56 380. 0.009 0 .007 0.00 0.07 455.57 444. 0.010 0 .007 0.00 0.08 455.58 507. 0.012 0 .008 0.00 0.09 455.59 570. 0.013 0 .008 0.00 0.30 455.80 1901. 0.044 0.015 0.00 0.51 456.01 3231. 0.074 0.019 0.00 0.72 456.22 4562. 0.105 0.023 0.00 0.93 456.43 5893. 0.135 0 .026 0.00 1.14 456.64 7223. 0.166 0.029 0.00 1.35 456.85 8554. 0.196 0.032 0.00 1.56 457.06 9884. 0.227 0.034 0.00 1.77 457.27 11215. 0.257 0.036 0.00 1.98 457.48 12545. 0.288 0.038 0.00 2.19 457.69 13876. 0.319 0.040 0.00 2.40 457 .90 15206. 0.349 0.042 0.00 2.61 458.11 16537. 0.380 0.044 0.00 2.81 458.31 17804. 0.409 0.046 0.00 I 3.02 458.52 19135. 0.439 0.047 0.00 � 3.23 458.73 20465. 0.470 0.049 0.00 I 3.44 458.94 21796. 0.500 0.050 0.00 3.65 459.15 23126. 0.531 0.052 0.00 3.86 459.36 24457. 0.561 0.053 0.00 4.07 459.57 25788. 0.592 0.055 0.00 I I 4.28 459.78 27118. 0.623 0.056 0.00 4.49 459.99 28449. 0.653 0.057 0. 00 4.70 460.20 29779. 0.684 0.059 0. 00 4.91 460.41 31110. 0.714 0.060 0. 00 5.12 460.62 32440. 0.745 0.061 0. 00 5.33 460.83 33771. 0.775 0.063 0.00 5.54 461.04 35101. 0.806 0.064 0.0a 5.74 461.24 36369. 0.835 0.065 0.00 5.80 461.30 36749. 0.844 0.065 0.00 5.82 461.32 36876. 0.847 0.066 0.00 5.83 461.33 36939. 0.848 0.067 0.00 5.85 461.35 37066. 0.851 0.070 0.00 5.86 461.36 37129. 0.852 0.073 0.00 5.88 461.38 37256. 0.855 0.077 0.00 5.89 461.39 37319. 0.857 0.082 0.00 5.91 461.41 37446. �.860 0.086 0.00 5.93 461.43 37572. 0.863 0.088 0.00 6.13 461.63 38840. 0.892 0.102 0.00 6.30 461.80 39917. 0.916 0 .111 0.00 6.31 461.81 39980. 0.918 0.112 0.00 6.33 461.83 40107. 0.921 0.114 0.00 6.34 461.84 40170. 0.922 0.116 0.00 6.35 461.85 40234. 0.924 0.119 0.00 6.37 461.87 40360. 0.927 0.122 0.00 6.38 461.88 40424. 0.928 0. 126 0.00 6.39 461.89 40487. 0.929 0.128 0.00 6.40 461.90 40550. 0.931 0.130 0.00 6.61 462 .11 41881. 0.961 0.149 0.00 6.82 462.32 43212. 0.992 0.163 0.00 7.03 462.53 44542. 1.023 0.176 0.00 7.24 462.74 45873. 1.053 0.187 0.00 7.45 462 .95 47203. 1.084 0.198 0.00 7.66 463.16 48534. 1.114 0.208 0.00 7.87 463.37 49864. 1.145 0.217 0.00 8. 08 463.58 51195. 1.175 0.226 0.00 8.29 463.79 52525. 1.206 0.234 0.00 8.30 463 .80 52589. 1.207 0.235 0.00 , 8.39 463.89 53159. 1.220 0.244 0.00 ', 8.47 463.97 53666. 1.232 0.253 0.00 , 8.56 464.06 54236. 1.245 0.267 0.00 �� 8.65 464. 15 54806. 1.258 0.282 0.00 � 8.74 464.24 55377. 1.271 0.299 0.00 8.82 464.32 55884. 1.283 0.317 0.00 8.91 464.41 56454. 1.296 0.336 0.00 9. 00 464.50 57024. 1.309 0.357 0.00 ' 9. 10 464.60 57658. 1.324 0.822 0.00 9.20 464.70 58291. 1.338 1.670 0.00 9.30 464.80 58925. 1.353 2.770 0.00 9.40 464.90 59558. 1.367 4.070 0.00 9.50 465.00 60192. 1.382 5.540 0.00 9.60 465.10 60826. 1.396 6.970 0.00 9.70 465.20 61459. 1.411 7.500 0.00 9.80 465.30 62093. 1.425 7.990 0.00 �, 9.90 465.40 62726. 1.440 8.460 0.00 I 10.00 465.50 63360. 1.455 8.900 0.00 10.10 465.60 63994. 1.469 9.320 0.00 10.20 465.70 64627. 1.484 9.720 0. 00 10.30 465.80 65261. 1.498 10.100 0.0a 10.40 465.90 65894. 1.513 10.470 0.00 10.50 466.00 66528. 1.527 10.830 0.00 10.6a 466.10 67162. 1.542 11.170 0.00 10.70 466.20 67795. 1.556 11.500 0.00 10.80 466.30 68429. 1.571 11.830 0.00 10.90 466.40 69062. 1.585 12.140 0.00 Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (Cu-Ft) (Ac-Ft) 1 1.68 0.38 0.81 9.10 464.60 57636. 1.323 2 0.82 ******* 0.29 8.67 464.17 54933. 1.261 3 0.99 ******* 0.21 7.72 463 .22 48887. 1.122 4 1.02 ******* 0.19 7.39 462.89 46820. 1.075 5 0.87 ******* 0.10 6.14 461.64 38932. 0.894 6 0.85 ******* 0.06 5.49 460.99 34812. 0.799 7 0.66 ******* 0.06 4.97 460.47 31470. 0.722 8 0.70 ******* 0.05 3.13 458.63 19833. 0.455 ---------------------------------- Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File:rdout Inflow/Outflow Analysis Peak Inflow Discharge: 1.68 CFS at 6:00 on Jan 9 in Year 8 Peak Outflow Discharge: 0.807 CFS at 10:00 on Jan 9 in Year 8 Peak Reservoir Stage: 9. 10 Ft Peak Reservoir Elev: 464.60 Ft Peak Reservoir Storage: 57636. Cu-Ft . 1.323 Ac-Ft Flow Frequency Analysis Time Series File:rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS} (CFS) (ft) Period Q .286 2 2/09/Ol 20:00 0.807 9.10 1 100.00 0.990 0.060 7 1/07/02 4:00 0.286 8.67 2 25.00 0.960 0.210 3 3/06/03 22:00 0.210 7.72 3 10.00 0.900 0.048 8 8/26/04 8:00 0.195 7.39 4 5.00 0.800 0.064 6 1/08/05 5:00 0.103 6.14 5 3.00 0.667 0. 103 5 1/19/06 5:00 0.064 5.49 6 2.00 0.500 0. 195 4 11/24/06 8:00 0.060 4.97 7 1.30 0.231 0.807 1 1/09/08 10:00 0.048 3.13 8 1.10 0.091 Computed Peaks 0.633 9.06 50.00 0.980 Flow Duration from Time Series File:rdout.tsf Cutoff Count Frequency CDF Exceedence Probability CFS % % % 0.004 30303 49.418 49.418 50.582 0.506E+00 0.012 7813 12. 741 62.159 37.841 0.378E+00 0.020 6267 10.220 72.379 27.621 0.276E+00 I 0.028 5396 8.800 81.179 18.821 0.188E+00 I 0.036 4725 7. 705 88.885 11.115 0.111E+00 �� 0.044 2616 4 .266 93.151 6.849 0.685E-01 0.052 1789 2.917 96.068 3.932 0.393E-01 0.060 1447 2.360 98.428 1.572 0.157E-01 0.068 604 0.985 99.413 0.587 0.587E-02 0.076 22 0.036 99.449 0.551 0.551E-02 0.084 10 0.016 99.465 0.535 0.535E-02 0.092 43 0.070 99.535 0.465 0.465E-02 0.100 60 0.098 99.633 0.367 0.367E-02 0.108 48 0.078 99.711 0.289 0.289E-02 0.116 27 0.044 99.755 0.245 0.245E-02 a.124 6 0.010 99.765 0.235 0 .235E-02 a.132 5 0.008 99.773 0.227 0 .227E-02 a.140 14 0.023 99.796 0.204 0 .204E-02 a.148 13 0.021 99.817 0.183 0 .183E-02 a.156 9 0.015 99.832 0.168 0.168E-02 0.164 9 0.015 99.847 0.153 0.153E-02 a.172 13 0.021 99.868 0.132 0.132E-02 0.180 11 0.018 99.886 0.114 0.114E-02 0.188 12 0.020 99.905 0.095 0 .946E-03 0.197 12 0.020 99.925 0.075 0.750E-03 0.205 6 0.010 99.935 0.065 0 .652E-03 0.213 15 0.024 99.959 0.041 0.408E-03 0.221 8 0.013 99.972 0.028 0.277E-03 0.229 3 0.005 99.977 0.023 0.228E-03 0.237 5 0.008 99.985 0.015 0.147E-03 �.245 1 0.002 99.987 0 .013 0.130E-03 �.253 2 0.003 99.990 0.010 0.978E-04 0.261 1 0.002 99.992 0 .008 0 .815E-04 0.269 1 0.002 99.993 0.007 0.652E-04 0.277 2 0.003 99.997 0 .003 0 .326E-04 0.285 1 0.002 99.998 0 .002 0 .163E-04 Duration Comparison Anaylsis Base File: predev.tsf New File: rdout.tsf Cutoff Units: Discharge in CFS -----Fraction of Time----- ---------Check of Tolerance------- Cutoff Base New %Change Probability Base New %Change 0.065 I 0.95E-02 0.75E-02 -21.1 � 0.95E-02 0.065 0.064 -1.7 0.082 I 0.63E-02 0.54E-02 -14.5 � 0.63E-02 0.082 0.065 -20 . 9 0.100 I 0 .50E-Q2 0.37E-02 -24 .7 I 0.50E-02 0.100 0.090 -10 .4 0.118 � 0.37E-02 0.24E-02 -34.4 � 0.37E-02 0.118 0.100 -14 .8 0.135 � 0.29E-02 0.22E-02 -25.0 � 0.29E-02 0.135 0.108 -19. 9 0.153 � 0.22E-02 0. 17E-02 -20.7 � 0.22E-02 0.153 0.135 -11.9 0.171 I 0.15E-02 0.14E-02 -8.8 � 0.15E-02 0.171 0.166 -2 .8 0.188 I O .10E-02 0.95E-03 -7.9 � O.10E-02 0.188 0.185 -1.9 0.206 I 0.62E-03 0.59E-03 -5.3 � 0.62E-03 0.206 0.205 -0 .3 0.224 I 0.34E-03 0.26E-03 -23.8 � 0.34E-03 0.224 0.216 -3.2 0.241 I 0.21E-03 0. 15E-03 -30.8 � 0.21E-03 0.241 0.229 -4.9 0.259 � 0.16E-03 0.82E-04 -50.0 � 0.16E-03 0.259 0.235 -9.3 0.277 I 0.11E-03 0.33E-04 -71.4 � 0.11E-03 0.277 0.250 -9.8 0.294 � 0.16E-04 O. 00E+00 -100.0 � 0.16E-04 0.294 0.285 -3 .0 Maximum positive excursion = 0.001 cfs ( 0.6°s) occurring at 0.192 cfs on the Base Data:predev.tsf and at 0.193 cfs on the New Data:rdout.tsf Maximum negative excursion = 0.020 cfs (-22.9°s) occurring at 0. 087 cfs on the Base Data:predev.tsf and at 0. 067 cfs on the New Data:rdout.tsf N � rdout.dur o target.dur • � o -� v 0 0 � o � U a> � o� � � o � U � � N O 000 � o � 00 � '�� I O O I 10 �5 10 � 10 -3 10 �z 10 �� 10° � Probability Exceedence I , Delaney Park Subdivision Technical Informalion Report SECTION 5 - CONVEYANCE SYSTEM ANALYSIS AND DESIGN Conveyance analysis for the project was performed in accordance with Chapter 4 of the KCSWDM which requires that new pipe systems be designed with sufficient capacity to convey and contain at minimum the 25-yr peak flow. This system is designed to contain runoff rates generated by a 100 year storm event. The design flow rate for conveyance/backwater analysis is based on peak flow rates calculated using the Rational Method using developed conditions for improved tributary areas and existing conditions for any off-site tributary areas. A copy of the Rational Method and backwater calculations are provided in Section 5.1 of this report. Figure 7 illustrates the drainage sub-basin/sub- catchment areas used in the conveyance and backwater analyses. CPH Project No.001 1-08-006 May 12,2009 CP�H CONSULTANTS Page 17 CP H CONSULTANTS $ECTION 5. 1 CONVEYANCE AND BACKWATER ANALYSIS Site Planning ' Civil Engineering Project Management �and Development(onsulting Delaney Park Subdivision King County Back Wafer Results BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:east.bwp Surcharge condition at intermediate junctions Tailwater Elevation:464 . feet Discharge Range:0.5 to 8.74 Step of 0.5 [cfs] Overflow Elevation:510.98 feet Weir:NONE Upstream Velocity:3. feet/sec PIPE NO. 1: 82 LF - 24"CP @ 8. 02$ OUTLET: 453 .00 INLET: 459.58 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 467.60 BEND: 10 DEG DIA/WIDTH: 4 .5 Q-RATIO: 0.28 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ************************,r****************************************************** 0.50 4.43 464.01 * 0.012 0.25 0.13 11.00 11. 00 4.43 4 .43 0.25 1.00 4.42 464.00 * 0.012 0.35 0.17 11.00 11.00 4.42 4 .42 0.38 1.50 4.42 464.00 * 0.012 0.43 0.21 11.00 11.00 4.42 4.42 0.49 2.00 4.43 464.01 * 0.012 0.50 0.24 11.00 11.00 4.43 4.43 0.58 2.50 4.43 464.01 * 0.012 0.56 0.26 11.00 11.00 4.43 4.43 0.66 3.00 4.43 464.01 * 0.012 0.61 0.29 11.00 11.00 4.43 4.43 0.73 3.50 4.44 464.02 * 0.012 0.66 0.31 11.00 11.00 4.44 4.44 0.80 4.00 4 .44 464.02 * 0.012 0. 71 0.33 11.00 11.00 4.44 4.44 0.86 4.50 4 .45 464.03 * 0.012 0. 75 0.35 11.00 11.00 4 .45 4.45 0.92 5. 00 4 .45 464.04 * 0.�12 0.79 0.37 11.00 11.00 4 .45 4.46 0.97 5.50 4 .46 464 .04 * 0.012 0.83 0.39 11.00 11.00 4 .46 4.46 1.02 6.00 4 .47 464.05 * 0.012 0.87 0.40 11.00 11.00 4.47 4.47 1.07 6.50 4.48 464.06 * 0.012 0. 91 0.42 11.00 11.00 4.48 4.48 1.12 7.00 4.49 464.07 * 0.012 0.94 0.43 11.00 11. 00 4.49 4 .49 1.16 7.50 4.50 464.08 * 0.012 0. 98 0.45 11.00 11.00 4.50 4 .50 1.20 8.00 4.51 464.09 * 0.012 1. 01 0.46 11.00 11.00 4.51 4.51 1.24 8.50 4.53 464.11 * 0.012 1. 04 a.48 11.00 11.00 4.52 4.53 1.28 9.00 4.54 464.12 * 0.012 1.08 0.49 11.00 11.00 4.53 4.54 1.32 PIPE NO. 2: 35 LF - 18"CP @ 1.00� OUTLET: 459.58 INLET: 459.93 INTYP: 5 JUNC NO. 2: OVERFLOW-EL: 467.56 BEND: 80 DEG DIA/WIDTH: 4 .0 Q-RATIO: 0.12 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ,r*************************************************************************,r**** 0.39 4.09 464.02 * 0.012 0.24 0.20 4 .43 4.43 4.09 4 .09 0.30 0.78 4.08 464.01 * 0.012 0.33 0.27 4.42 4.42 4.07 4 .08 0.44 1.17 4.09 464.02 * 0.012 0.41 0.33 4.42 4.42 4.08 4 .09 0.55 1.56 4.11 464.04 * 0.012 0.47 0.38 4.43 4.43 4.08 4.11 0.65 1. 95 4.13 464.06 * 0.012 0.53 0.43 4.43 4.43 4.09 4. 13 0.74 2.34 4 .16 464.09 * 0.012 0.58 0.47 4.43 4.43 4.10 4. 16 0.82 2.73 4.19 464 .12 * 0.012 0.63 0.51 4.44 4.44 4.11 4. 19 0.91 3.13 4.23 464.16 * 0.012 0.68 0.54 4.44 4.44 4.12 4.23 0.99 3.52 4 .27 464 .20 * 0.012 0.72 0.58 4.45 4.45 4.13 4.27 1.07 3 .91 4 .31 464.24 * 0.012 0.76 0.61 4.46 4.46 4 .15 4 .31 1.14 4 .30 4 .36 464.29 * 0.012 0.80 0.64 4.46 4 .46 4 .16 4.36 1.22 4 .69 4.42 464.35 * 0.012 0.84 0.68 4.47 4 .47 4.18 4 .42 1.30 5.08 4 .48 464.41 * 0.012 0.87 0.71 4.48 4 .48 4.20 4.48 1.38 5 .47 4 .55 464.48 * 0.012 0.91 0.74 4.49 4.49 4 .22 4.55 1.47 CPH Project No. 001 1-OS-006 Page 1 of 3 March 3, 2009 Delane Park Subdivision I Y King County Back Water Resulfis ' 5.86 4.62 464 .55 * 0.a12 0.94 0.77 4.50 4.50 4.25 4.62 1.55 6.25 4.69 464.62 * 0.012 0.97 0.80 4.51 4.51 4 .27 4.69 1.63 6.64 4.77 464.70 * 0.012 1. 00 0.83 4 .53 4 .53 4 .30 4.77 1.72 7. 03 4 .86 464. 79 * 0 .a12 1. 03 0.86 4 .54 4 .54 4 .32 4.86 1.80 PIPE NO. 3 : 30 LF - 12"CP @ 18.SOo OUTLET: 460.93 INLET: 466.57 INTYP: 5 JUNC NO. 3: OVERFLOW-EL: 471.07 BEND: 10 DEG DIA/WIDTH: 2.3 Q-RATIO: 0. 19 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.35 0.25 466.82 * 0. 012 0.25 0.10 3.09 3 . 09 0.25 ***** 0.24 0.70 0.38 466.95 * 0. 012 0.35 0.14 3.08 3 . 08 0.35 ***** 0.38 1.05 0.50 467.07 * 0.012 0.44 0.17 3.09 3. 09 0.44 ***** 0.50 1.40 0.61 467.18 * 0.012 0.50 0.20 3.11 3. 11 0.50 ***** 0.61 1.74 0.70 467.27 * 0.012 0.57 0.22 3.13 3.13 0.57 ***** 0.70 2 .09 0. 79 467.36 * 0.012 0.62 0.24 3.16 3.16 0.62 ***** 0.79 2 .44 0.88 467.45 * 0.012 0 .67 0.26 3.19 3.19 0.67 ***** 0.88 2.79 0.97 467.54 * 0.012 0.72 0.28 3.23 3.23 0.72 ***** 0.97 3 .14 1.06 467.63 * 0.012 0.76 0.30 3.27 3.27 0.76 ***** 1.06 3.49 1.19 467.76 * 0.012 0.80 0.31 3.31 3.31 0.80 ***** 1.19 3.84 1.32 467.89 * 0.a12 0.84 0.33 3.36 3.36 0.84 ***** 1.32 4. 19 1.46 468. 03 * 0.012 0.87 0.35 3 .42 3.42 0.87 ***** 1.46 4.53 1.61 468. 18 * 0.012 0.89 0.36 3 .48 3.48 0.89 ***** 1.61 4.88 1.77 468.34 * 0.012 0. 92 0.37 3 .55 3.55 0.92 ***** 1.77 5.23 1.95 468.52 * 0.012 0. 93 0.39 3 .62 3.62 0.93 ***** 1.95 5.58 2 .14 468.71 * 0.012 0.95 0.40 3 .69 3.69 0.95 ***** 2 .14 5.93 2 .34 468.91 * 0.012 0.96 0.42 3.77 3.77 0.96 ***** 2 .34 6.28 2.56 469.13 * 0.012 0.97 0.43 3 .86 3.86 0.97 ***** 2.56 FIPE NO. 4: 179 LF - 12"CP @ 12.72% OUTLET: 466.57 INLET: 489.34 INTYP: 5 JLTNC NO. 4: OVERFLOW-EL: 492.90 BEND: 0 DEG DIA/WIDTH: 2.3 Q-RATIO: 0.88 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN T'W DO DE HWO HWI ********************************,r**************************************,r******* 0.29 0.24 489.58 * 0.012 0.23 0.11 0.25 0.25 0 .23 ***** 0.24 0.59 0.37 489.71 * 0.012 0.32 0.15 0.38 0.38 0.32 ***** 0.37 0.88 0.49 489.83 * 0.012 0 .40 0.18 0.50 0.50 0.40 ***** 0.49 1. 17 0.59 489.93 * 0.012 0 .46 0.20 0.61 0.61 0.46 ***** 0.59 1.47 0.68 490.02 * 0.012 0 .52 0.23 0.70 0.70 0.52 ***** 0. 68 1.76 0.77 490. 11 * 0.012 0 .57 0.25 0.79 0.79 0.57 ***** 0.77 2 .05 0.86 490.20 * 0.012 0.62 0.27 0.88 0.88 0.62 ***** 0.86 2 .34 0.95 490.29 * 0.012 0.66 0.28 0.97 0.97 0.66 ***** 0.95 2 .64 1.04 490.38 * 0.012 0.70 0.30 1.06 1. 06 0.70 ***** 1.04 2 .93 1.13 490.47 * 0 .012 0.74 0.32 1.19 1. 19 0.74 ***** 1.13 3 .22 1.24 490.58 * 0.012 0.77 0.33 1.32 1.32 0.77 ***** 1.24 3 .52 1.36 490.70 * 0 .012 0.81 0.35 1.46 1.46 0.81 ***** 1.36 3 .81 1.49 490.83 * 0.012 0.84 0.36 1.61 1.61 0.84 ***** 1.49 4 .10 1.64 490.98 * 0.012 0. 86 0.38 1.77 1. 77 0.86 ***** 1.64 4 .40 1.79 491.13 * 0.012 0.88 0.39 1.95 1. 95 0.88 ***** 1.79 4 .69 1. 95 491.29 * 0.012 0.90 0.41 2.14 2. 14 0.90 ***** 1.95 4 . 98 2 . 12 491.46 * 0.012 0.92 0.42 2.34 2.34 0. 92 ***** 2.12 5.28 2.31 491.65 * 0.012 0.94 0.43 2 .56 2.56 0.94 ***** 2.31 CPH Project No. 001 1-08-006 Page 2 of 3 March 3, 2009 Delaney Park Subdivision King County Back Wafer Results PIPE NO. 5: 171 LF - 12"CP @ 10.57°s OUTLET: 489.34 INLET: 507.41 INTYP: 5 JLJNC NO. 5: OVERFLOW-EL: 510.98 BEND: 90 DEG DIA/WIDTH: 2.3 Q-RATIO: 0.93 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HV70 HWI ******************************************************************************* 0.16 0.17 507.58 * 0.012 0.17 0.08 0.24 0.24 0.17 ***** 0.17 0.31 0.26 507.67 * 0.012 0.24 0.11 0.37 0.37 0.24 ***** 0.26 0.47 0.34 507.75 * 0.012 0.29 0.14 0.49 0.49 0.29 ***** 0.34 0.62 0.40 507.81 * 0.a12 0.33 0.16 0.59 0.59 0.33 ***** 0.40 0.78 0.47 507.88 * 0.012 0.37 0.17 0.68 0.68 0.37 ***** 0.47 0.94 0.52 507.93 * 0.012 0 .41 0. 19 0.77 0.77 0.41 ***** 0.52 1.09 0.58 507.99 * 0.�12 0 .44 0.20 0.86 0.86 0.44 ***** 0.58 1.25 0 .63 508.04 * 0.012 0.48 0.22 0.95 0.95 0.48 ***** 0.63 1.40 0 .69 508.10 * 0.012 0.51 0.23 1.04 1.04 0.51 ***** 0.69 1.56 0 .74 508.15 * 0.012 0.53 0.24 1.13 1.13 0.53 ***** 0. 74 1.71 0.79 508.20 * 0.012 0. 56 0.25 1.24 1.24 0.56 ***** 0.79 1.87 0.85 508.26 * 0.012 0. 59 0.27 1.36 1.36 0.59 ***** 0.85 2.03 0.90 508.31 * 0.012 0.61 0.28 1.49 1.49 0.61 ***** 0. 90 2.18 0.95 508.36 * 0.012 0.64 0.29 1.64 1.64 0.64 ***** 0. 95 2 .34 1.01 508.42 * 0.012 0.66 0.30 1.79 1.79 0.66 ***** 1.01 2 .49 1.06 508.47 * 0.012 0.68 0.31 1.95 1.95 0.68 ***** 1.06 2 .65 1.12 508.53 * 0.012 0.70 0.32 2 .12 2.12 0.70 ***** 1. 12 2 .81 1.17 508.58 * 0.012 0.72 0 .33 2 .31 2.31 0. 72 ***** 1. 17 PIPE NO. 6 : 37 LF - 12"CP @ 1. 00°s OUTLET: 507.41 INLET: 507.78 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ,r****************************************************************************** 0.08 a.12 507.90 * 0.012 0. 12 0. 11 0.17 0.17 0.12 ***** 0.11 0.16 0. 17 507.95 * 0.012 0. 17 0. 14 0.26 0.26 0.17 ***** 0.14 0 .24 0.21 507.99 * 0.012 0.21 0.17 0.34 0.34 0 .21 ***** 0. 17 0 .32 0.24 508.02 * 0.012 0.24 0.20 0.40 0.40 0.24 ***** 0.20 0 .40 0.27 508.05 * 0.012 0.27 0.22 0.47 0.47 0.27 ***** 0.22 0 .48 0.29 508.07 * 0.012 0.29 0.24 0.52 0.52 0.29 ***** 0.25 a .57 0.32 508.10 * 0.012 0.32 0.26 0 .58 0.58 0.32 ***** 0.29 0.65 0.34 508.12 * 0 .012 0.34 0.28 0.63 0.63 0.34 ***** 0. 32 0.73 0.36 508.14 * 0 .012 0.36 0.30 0 .69 0.69 0.36 ***** 0. 35 0.81 0.38 508.16 * 0.012 0.38 0.32 0 .74 0.74 0.38 ***** 0. 38 0.89 0.47 508.25 * 0.012 0.40 0.33 0.79 0.79 0.41 0.47 0.41 0.97 0.50 508.28 * 0.012 0.42 0.35 0.85 0.85 0.47 0 .50 0.44 1.05 0.53 508.31 * 0.012 0 .44 0.36 0.90 0.90 0.52 0 .53 0.47 1.13 0.59 508.37 * 0.012 0.45 0.38 0.95 0.95 0.59 0.58 0.49 1.21 0.65 508.43 * 0.012 0.47 0.39 1.01 1.01 0.65 0.63 0�.52 1.29 0.71 508.49 * 0.012 0.49 0.40 1.06 1.06 0.71 0.68 0.55 1.37 0.78 508.56 * 0.012 0.50 0.42 1.12 1.12 0.78 0. 74 0.58 1.45 0.84 508.62 * 0.012 0. 52 0.43 1.17 1. 17 0.84 0. 80 0.60 CPH Project No. 001 1-08-006 Page 3 of 3 March 3, 2009 Delaney Park Subdivision King County Back Water Results BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:north.bw� Surcharge condition at intern.�u�a-e ;�a�:c�_��r.� Tailwater Elevation:464. feet Discharge Range:0.5 to 8.74 Step of 0 . 5 � r Overflow Elevation:464.67 fe Weir:NONE Unstream Velocitv:3. feet!se F=?E i10. �. 82 L= - 24"CP 2 . 0�° ��T:TL�',: ��3 . UC �I��=T: �59.58 IIdT'iP: � JUNC NO. 1: OVERFLOW-EL: 467.60 BEND: i5 DEG DIA/WIDTH: 4 .5 Q-RATIO: 0.28 Q(CFS) HW(FT� HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.50 4 .43 464.01 * 0.012 0.25 0.13 11.00 11.00 4 .43 4.43 0.25 1.00 4.42 464.00 * 0.012 0.35 0.17 11.00 11.00 4 .42 4.42 0 .38 1.50 4 .43 464.01 * 0.012 0.43 0.21 11.00 11.00 4 .42 4.43 0.49 2.00 4.43 464.01 * 0.012 0.50 0.24 11.00 11.00 4.43 4 .43 0.59 2.50 4.44 464.02 * 0.012 0.56 0.26 11. 00 11.00 4.43 4 .44 0.67 3.00 4.45 464.03 * 0.012 0.61 0.29 11.00 11.00 4.43 4.45 0.75 3.50 4.46 464.04 * 0.012 0.66 0.31 11. 00 11.00 4 .44 4.46 0.82 4.00 4.47 464.05 * 0.012 0.71 0.33 11. 00 11.00 4.44 4.47 0.88 4.50 4.48 464.06 * 0.�12 0.75 0.35 11. 00 11.00 4 .45 4.48 0.95 5.00 4.50 464.08 * 0.012 0.74 0.37 11.00 11.00 4.45 4.50 1.01 5.50 4.51 464.09 * 0.012 0.83 0.39 11.00 11.00 4.46 4.51 1.07 6.00 4.53 464.11 * 0.012 0.87 0.40 11.00 11.00 4.47 4 .53 1.13 6.50 4.55 464.13 * 0.012 0.91 0.42 11.00 11.00 4.48 4.55 1.18 7.00 4.57 464.15 * 0.012 0.94 0.43 11.00 11.00 4.49 4.57 1.24 7.50 4.59 464.17 * 0.012 0.98 0.45 11.00 11.00 4.50 4.59 1.29 8.00 4.61 464.19 * 0.012 1.01 0.46 11.00 11.00 4.51 4.61 1.34 8.50 4.64 464.22 * 0.012 1.04 0.48 11.00 11.00 4.52 4.64 1.39 9.00 4 .67 464.25 * 0 .012 1.08 0.49 11.00 11.00 4.53 4.67 1.45 PIPE NO. 2 : 35 LF - 24"CP @ 1.00% OUTLET: 459.58 INLET: 459.93 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 467.56 BEND: 80 DEG DIA/WIDTH: 4.0 Q-RATIO: 9.49 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.39 4.09 464.02 * 0.012 0.22 0.18 4 .43 4.43 4.09 4.09 0.28 0.78 4.08 464.01 * 0.012 0.31 0.25 4 .42 4.42 4.07 4.08 0.40 1.17 4 . 08 464.01 * 0.012 0.38 0.30 4.43 4.43 4.08 4.08 0.50 1.56 4 .09 464.02 * 0.012 0.44 0.35 4.43 4.43 4 .08 4.09 0.58 1.95 4 . 10 464.03 * 0.012 0.49 0.39 4.44 4.44 4 .09 4.10 0.65 2.34 4 . 12 464.05 * 0.012 0.54 0.42 4.45 4.45 4 .10 4.12 0.72 2. 73 4 . 13 464.06 * 0.012 0.58 0.46 4.46 4.46 4 .11 4.13 0.78 3.13 4 . 15 464 .08 * 0.012 0 .62 0.49 4.47 4.47 4.12 4 .15 0.84 3.52 4 .17 464 .10 * 0.012 0 .66 0.52 4.48 4.48 4.14 4.17 0.90 3.91 4 .20 464 .13 * 0.012 0 .70 0.54 4.50 4.50 4.15 4.20 0.96 4.30 4 .22 464.15 * 0.012 0.73 0.57 4.51 4.51 4 .17 4.22 1.01 4.69 4 .25 464.18 * 0.012 0.77 0.60 4.53 4.53 4 .19 4.25 1.06 5.08 4.28 464.21 * 0.012 0.80 0.62 4.55 4.55 4 .21 4.28 1.11 5.47 4.32 464.25 * 0.012 0.83 0.65 4.57 4.57 4 .24 4.32 1.17 CPH Project No. 001 1-08-006 Page 1 of 3 March 3, 2009 Delaney Park Subdivision King County Back Water Results 5.86 4 .35 464.28 * 0.012 0.86 0.67 4 .59 4.59 4.26 4.35 1.21 6.25 4 .39 464.32 * 0.012 0.89 0.69 4 .61 4.61 4.29 4.39 1.26 6.64 4 .43 464 .36 * 0.012 0.92 0.72 4 .64 4.64 4.32 4 .43 1. 31 7.03 4 .48 464 .41 * 0. 012 0. 95 0.74 4 .67 4 .67 4. 35 4 .48 i.36 PIPE NO. 3 : 33 LF - 12"CP 'a 0.48°s OUTLET: 460.93 INLET: 461.09 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 465.14 BEND: 10 DEG DIA/WIDTH: 2.3 Q-RATIO: 0.48 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI *******************+*********************************************************** 0.04 2.94 464.03 * 0.012 0.08 0.09 3 .09 3. 09 2. 94 2.94 0.10 0.07 2 .92 464.01 * 0.012 0.12 0.12 3 .08 3.08 2.92 2 .92 0. 15 0.11 2.92 464.01 * 0.012 0.14 0.14 3.08 3.08 2.92 2.92 0.18 0.15 2 .93 464.02 * 0.012 0.16 0.16 3.09 3.09 2.93 2 .93 0.21 0.19 2.94 464.03 * 0.012 0.18 0.18 3. 10 3 .10 2.94 2.94 0.24 0.22 2.96 464.05 * 0.012 0.20 0.20 3.12 3 .12 2.96 2. 96 0.26 0.26 2.98 464.07 * 0.012 0.21 0.22 3 .13 3 .13 2.97 2. 98 0.28 0 .30 3 .00 464.09 * 0.012 0.23 0.23 3.15 3.15 2.99 3.00 0.30 0 .34 3 .02 464.11 * 0.012 0.24 0.24 3 .17 3. 17 3.01 3.02 0.32 0 .37 3 .04 464.13 * 0.012 0.26 0.26 3 .20 3.20 3.04 3.04 0.34 0.41 3 .07 464.16 * 0.012 0.27 0.27 3 .22 3.22 3.07 3.07 0.36 0.45 3.10 464.19 * 0.012 0.28 0.28 3.25 3.25 3.10 3.10 0.38 0 .48 3 .14 464.23 * 0.012 0.29 0.29 3 .28 3.28 3.13 3.14 0.39 0.52 3 .17 464.26 * 0.012 0.30 0 .30 3.32 3.32 3.16 3.17 0.41 0.56 3.21 464.30 * 0.012 0.32 0.31 3 .35 3.35 3.20 3 .21 0.42 0.60 3 .25 464.34 * 0.012 0.33 0.32 3.39 3.39 3.24 3 .25 0.44 0.63 3 .29 464.38 * 0.012 0.34 0.34 3.43 3.43 3 .28 3.29 0.45 0 .67 3 .34 464.43 * 0.012 0.35 0.35 3.48 3 .48 3.33 3.34 a.47 PIPE NO. 4 : 36 LF - 12"CP @ 0.50% OUTLET: 461.09 INLET: 461.27 INTYP: 5 JUNC N0. 4 : OVERFLOW-EL: 464.67 BEND: 90 DEG DIA/WIDTH: 2.3 Q-RATIO: 0.52 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN T'W DO DE HWO HWI ************************************************************************,r****** 0.03 2 .77 464.04 * 0.012 0.07 0.07 2.94 2.94 2.77 2.77 O.Q8 0.05 2 .74 464.01 * 0.012 0.10 0.10 2.92 2 .92 2.74 2 .74 0.12 0.08 2 .74 464 .01 * 0.012 0. 12 0.12 2.92 2 .92 2 .74 2 .74 a.15 0.10 2 .75 464.02 * 0.012 0.13 0.14 2.93 2.93 2 .75 2.75 0.17 0.13 2 .76 464.03 * 0.012 0.15 0.15 2.94 2. 94 2 .76 2. 76 0.19 0.15 2 .78 464.05 * 0.012 0.16 0.16 2 .96 2. 96 2.78 2. 78 0.21 0.18 2 .80 464.07 * 0.012 0.18 0 .18 2 .98 2.98 2.80 2.80 0.23 0 .20 2.82 464.09 * 0.012 0 .19 0.19 3 .00 3.00 2.82 2.82 0.25 0 .23 2.84 464.11 * 0.012 0.20 0.20 3.02 3.02 2.84 2.84 0.26 0 .25 2 .87 464.14 * 0.012 0.21 0.21 3. 04 3.04 2.86 2.87 0.28 0.28 2.90 464.17 * 0.012 0.22 0.22 3.07 3.07 2.89 2.90 0.29 �.30 2 . 93 464.20 * 0.012 0.23 0.23 3.10 3.10 2.92 2.93 0. 31 0.33 2 .96 464.23 * 0.012 0.24 0.24 3 .14 3.14 2.96 2.96 0.32 0.35 3 .00 464.27 * 0.012 0.25 0.25 3.17 3 .17 2.99 3 .00 0.33 0.38 3 .04 464.31 * 0.012 0.26 0.26 3 .21 3 .21 3 .03 3 .04 0.34 0.40 3.08 464.35 * 0.012 0.27 0.26 3 .25 3.25 3 .07 3.08 0.36 0 .43 3.13 464.40 * 0.012 0.28 0.27 3.29 3.29 3 .12 3. 13 0.37 0 .45 3.18 464.45 * 0.012 0.28 0 .28 3 .34 3.34 3.17 3. 18 0.38 CPH Project No. 001 1-08-006 Page 2 of 3 March 3, 2009 Delaney Park Subdivision King County Back Water Results PIPE NO. 5: 33 LF - 12"CP C� 1.00% OUTLET: 461.27 INLET: 461.60 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******,r**********************�*************************,r*********************** 0.02 2.45 464.05 * 0.012 0.06 0. 05 2 .77 2 .77 2.45 2 .31 0.05 0.03 2.41 464.01 * 0.012 0.08 0.07 2 .74 2 .74 2.41 2 .27 0.07 0.05 2.41 464.01 * 0.�12 0.10 0.08 2 .74 2.74 2 .41 2.27 0.08 0.07 2.42 464.02 * 0.012 0.11 0.10 2.75 2.75 2 .42 2.28 0. 10 0.08 2.43 464.03 * 0.012 0 .12 0.11 2.76 2.76 2 .43 2.29 0.11 0.10 2.45 464.05 * 0.012 0.13 0.12 2.78 2.78 2.45 2.31 0.12 0.12 2.47 464.07 * 0.012 0. 14 0 .12 2.80 2.80 2.47 2.33 0.12 0.13 2.49 464 .09 * 0.012 0.15 0.13 2.82 2.82 2.49 2.35 0.13 0.15 2.51 464 .11 * 0.012 0.16 0.14 2.84 2.84 2.51 2.37 0.14 0.17 2.54 464 .14 * 0.012 0.17 0.15 2.87 2.87 2.54 2.40 0.15 0.18 2 .57 464.17 * 0.012 0.18 0.15 2.90 2. 90 2.57 2 .43 0.15 0.20 2 .60 464.20 * 0.012 0.19 0.16 2.93 2.93 2.60 2 .46 0.16 0.22 2 .63 464.23 * 0.012 0.20 0.17 2.96 2. 96 2 .63 2 .50 0.17 0.23 2 .67 464.27 * 0.012 0.20 0.17 3.00 3.00 2 .67 2.53 0.17 0.25 2. 71 464.31 * 0.012 0.21 0.18 3. 04 3.04 2 .71 2.57 0.18 0.26 2. 75 464.35 * 0.012 0.22 0.18 3. 08 3.08 2 .75 2.62 0.18 0.28 2.80 464.40 * 0.012 0.22 0.19 3. 13 3.13 2 .80 2. 66 0. 19 0.30 2 .85 464 .45 * 0. 012 0.23 0 .19 3 . 18 3 . 18 2 . 85 2. 71 0. 19 CPH Project No. 001 1-08-006 Page 3 of 3 March 3, 2009 CP H CONSULTANTS FIGURE 7 BASIN CONTRIBUTING AREAS Site Planning (ivil Engineering Project Management Land Development Consulting NE 1,/4, SE 1,/4, SEC. 10, 7WP 23 A�, R5E W.M. � > � � 0 � . . . . 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' ' .� 1 a J �� Y �� -�. ,' .�.�. . .::�':. . , .�. . '.::. .�': : . .,�.i�'�. . ,: ,. ' ..,:'; � .. ,f� `. , ...__... ._._'_. . . . . . . . ..._ . , , .�.; . ,.:: -" ��€ �;} i I� cuENr RICK BURNSTEAD CONSTRUCTION C0. 11960 NE 24TH ST,SUfTE 200 BELLEVUE.WA 98005 Pnone:(4 2 51 4 54-1900 FAY:(425)81&7369 CPI�--�� CONSULTANTS rti.yn+y.+� Mni��•I�IYiN+f�Y� 1331N MInr.Bub f�0 IG'lii4 WAiBPi3 Pl�u�(�]�]l62%0 FAC(�PB62i0Y w.vqear�rirmm PFr'�1=CT NC QD1.1-0BQOB GALL BEFORE DRAWiNG T� ,� � YOUDIG FIGURE 7 7-000-424-5553 HORIZ� IN FEET Delaney Park Subdivision Technical Information Report SECTION 6 - SPECIAL REPORTS AND STUDIES Speciai reports and/or studies for items such as Wetland Mitigation have been submitted in support of the entitlement and various phases of development. The references listed below have been used as a basis of design for the grading and drainage improvements proposed for the Delaney Park Subdivision project: • Wetland and Wildlife Assessment Report (Raedeke Associates, Inc.; July 19, 2007)—see Section 6.1 • Traffic Impact Analysis (The Transpo Group; December 18, 2007) —see Section 6.2 • Wetland Impact Analysis (Raedeke Associates, Inc.;May 13, 2009) —see Section 6.3 CPN Project No.001 1-OS-006 May 1 2, 2009 CP I H CONSULTA�fTS Page 18 � CP H CONSULTANTS $ECTION b. l WETLAND AND WILDLIFE ASSESSMENT REPORT (RAEDEKE ASSOCIATES, INC.; �ULY 1 9, 2007� Site Planning Ciril Engineering Project Management �and Development Consulting 4 . - � . . � � . . i � t i ' WETLAND AND WILDLIFE . ASSESSMENT , � � : � � � � � G � � Delaney Park King County, Washington � , ; � Ju13r 19, 2007 ''�I RAEDEKE ASSO�.+IATES, INC. Report To: Mr. Greg Strong Rick Burnstead Construction Co. 11980 I�'E24th Street, Suite 200 Belleti-ue, VVA 98005 Title: Wetland and��ildlife Assessment for Delaney Park, King Count}�,Washington Project Number: 2006-038-002 Prepared By: RAEDEKE ASSOCIATES, II�TC. 5711 Northeast 63rd Street Seattle, Washington 9811 S (206) 525-8122 Date: Julv 19. 2007 <�ECEKE ASSOCI,�TrS, INC r _ � '11 ��crtnea�t 63rc �t c�� 1,1� �� , � (��'�) ��-�� , , � �� Project Manager: Lisa Danielski, B.A. Wetland Biologist/Botanist Current Project Personnel: Jennifer Leach,M.S. Ecologist Richard W. Lundquist,M.S. Vice-president/Wildlife Biologist Claude McKenzie,B.S.L.A. Landscape Architect Emily Podolak, M.L.A. Landscape Designer Gail W. Livingstone, B.S.L.A. Natural Resource Planner&Editor r�,aE��L ,asso�,�TEs, iN� ��, � r'�,,✓�r�r,n;Jcr �,�.r�' j+ j�,�—',� ��''�,' C��v �,L��j �L�-R��L TABLE OF CONTENTS Page LISTOF FIGURES..............................................................................................................v LISTOF Tables....................................................................................................................v 1.0 �I"TRODUCTION.........................................................................................................1 1.1 Statement of Purpose.............................................................................................1 1.2 Study Area.............................................................................................................1 2.0 METHODS ...................................................................................................................2 2.1 Definitions and Methodologies..............................................................................2 2.2 Background Review...............................................................................................3 2.3 Field Sampling Procedures and Data Analysis......................................................4 3.0 EXISTING CONDI'I'IONS...........................................................................................7 3.1 Results of Background Investigation.....................................................................7 3.2 General Study Area Description............................................................................8 3.3 Wetland Descriptions.............................................................................................9 3.4 Upland Descriptions............................................................................................14 3.5 Special Habitat Features ......................................................................................16 3.6 Wildlife................................................................................................................16 3.7 Endangered, Threatened, Sensitive, and Other Priority Species and Habitats ....19 4.0 ��BTLAND FUNCTIONAL ASSESSMENT............................................................21 4.1 General Descriptions of Wetland Functions and Values.....................................21 4.2 On-Site Wetland Functional Assessments...........................................................24 5.0 REGULATORY CONSIDER.ATIONS......................................................................27 5.1 Federal Clean Water Act(U.S. Army Corps of Engineers).................................27 5.2 King County.........................................................................................................27 6.0 Proposed Impacts........................................................................................................30 6.1 Direct Impacts......................................................................................................30 6.2 Indirect Wetland Impacts.....................................................................................30 7.0 Mitigation....................................................................................................................34 7.1 Avoidance and Minimization of Wetland Impacts..............................................34 7.2 Compensatory Mitigation for Buffer Impacts......................................................35 iii S.0 LL�LII?�IIUtiS ...........................................................................................................=`; 9 A LITERATURE CI I'ED ...............................................................................................4�� FIGURES AND TABLES .................................................................................................4r� APPENDIXA: Methodolo;�� .............. ................. ..............._..............._......... ............ :1-l � APPENDIX B: Field Survey Data...................................................................................B- APPENDIX C: WSDOT (2000)Field Rating Forms......................................................0 APPE'_�TDIX D: ��DOE (20041 Wetland Ratina Forms..................................................D iv LIST OF FIGL?RES I Fi�Ture � I�� Pa�e � : . Re�ional map ................. ............. � I ..........................................................................�; 2. Vicinity map...........................................................................................................4� 3. USFWS Wetland Inventory map ...........................................................................4 4. NRCS Web Soil Survey map 5. WDNR Forest Practice Acti� I 6. King Couniy Sensitive Areas Folio .......................................................................52 7. King County iMAP................................................................................................53 8. Existing Conditions................................................................................................54 9. Proposed Site Plan.................................................................................................55 LIST OF TABLES Figure Page 1. List of aerial photos......................................:.........................................................56 2. WDI�'R water types................................................................................................57 3. Ratings and buffers of wetlands on project site.....................................................60 4. Wildlife species detected on project site................................................................61 5. Functions and Values for Wetlands A,B, C and D ...............................................62 I v 1 1.0 INTRODUCTION 1.1 STATEMENT OF PURPOSE The purpose of this report is to document the results of our field investigation of potential wetland areas located on the Delaney Park project site in King County, Washington (Figures 1 & 2). The primary objectives of this study are to: (1) identify and delineate any portions of the site that could be classified as��vetlands, (2)provide baseline biological information on the wildlife habitat on the site, (3) evaluate impacts of the proposed development on wetlands and wildlife habitat, and (4) discuss mitigation measures to avoid,reduce, or compensate for those impacts, as appropriate. 1.2 STUDY AREA The project site consists of six parcels totaling 8.84 acres in the southeast quarter of Section 10, Township 23 North,Range 5 East W.M., within the Urban Growth Area (L7GA) of King County, Washington. Specifically, the parcels are located southwest of the intersection of 148`h Avenue SE and SE 120`h St. and are identified as King County tax parcel#'s 1023059350, 1023059368, 1023059391, 1023059189, 1023059346, and 1023059345, as described to us by Mr. Jamie Schroeder of CPH Consultants on April 14, 2006 and Mr. Greg Strong of Rick Burnstead Construction Co. on October 12, 2006. Delanei�Park Raedeke A� 2 2.0 METHODS 2.1 DEFII�ITIONS AND METHODOLOGIES Under Section 404 of the Clean Water Act, a v��etland is defined as an area"inundated or I saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances does support, a prevalence of vegetation typically adapted for life in saturated soil conditions" (Federal Register 1986:41251). We based our investigation upon the guidelines of the U.S. Army Corps of Engineers (COE) Wetlands Delineation Manual (Environmental Laboratory 1987), as revised in the Washington State Wetlands Identification and Delineation Manual published by the ' Washington State Department of Ecology(WDOE 1997). The WDOE wetlands manual is required by state law for all local jurisdictions (including King County), is consistent with the 1987 COE wetland delineation manual with respect to wetland identification and delineation, and incoiporates subsequent amendments and clarifications provided by the U.S. Army COE (1991a, 1991b, 1992, 1994). The COE,which requires use of the 1987 delineation manual, as amended, has federal regulatory jurisdiction of the dredging or filling of"Waters of the United States,"which include wetlands. As outlined in the COE (Environmental Laboratory 1987) and WDOE (1997)wetland delineation manuals,wetlands are distinguished by three diagnostic characteristics: hydrophytic vegetation(wetland plants),hydric soil (wetland soil), and wetland hydrology. Definitions of these terms are provided below. Hydrophytic vegetation is defined as"macrophytic plant life growing in water, soil or substrate that is at least periodically deficient in oxygen as a result of excessive water content"(Environmental Laboratory 1987). The U.S. Fish and Wildlife Service (LJSFWS) Wetland Indicator Status(WIS)ratings are used to define whether hydrophytic vegetation is present(Reed 1988, 1993). The regional WIS ratings define the estimated probability of a species occurring in wetlands versus non-wetlands in the region. Plants are rated, from highest to lowest probability of occurrence in�Tetlands, as obligate (OBL), facultative wetland{FACW), facultative (FAC), facultative upland (FACLn, and upland(UPL),respectively. In general, under the 1987 federal methodology, more than 50% of the predominant plant species in an area must be rated facultative or wetter for the area under consideration to be regarded as having hydrophytic vegetation. Further discussion of this analysis is in Appendix A. A hydric soil is defined as "a soil that is formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part"(Federal Register 1994: 35681). The morpholobical characteristics of the soils on the study area were examined to determine whether any could be classified Delaney Park Raedeke Associates, Inc. Wetland and R'ildlife Assessment July 19, 2007 3 as h dric. A discussion of the morphological characteristics used to identify hydric soil II' Y is in Appendix A. Wetland hydrology could be present if the soils were saturated (sufficient to produce anaerobic conditions)within the majority of the rooting zone for at least 5% of the � growing season (COE 1992). It should be noted,however, that areas having saturation , to the surface between 5% and 12%of the growing season may or may not be wetland , (COE 1992; see also Table A.4, Appendix A). Depending on soil type and drainage II characteristics, saturation to the surface may occur if water tables were shallower than about 12 inches below the soil surface during this time period. Positive indicators of wetland hydrology include direct observation of inundation or soil saturation, as well as indirect evidence such as driftlines,watermarks, surface encrustations, and drainage ' patterns (WDOE 1997). 2.2 BACKGROUI��REVIEW i 2.2.1 Wetlands In preparation for our site investigation,we collected and analyzed available information for the project area. We collected maps and information from the U.S. Fish and Wildlife National Wetlands Inventory(USFV4'S NWI 2006),the U.S.D.A. NRCS (2006) V1eb Soil Survey, the Washington Department of Natural Resources (WDNR 2006) Forest Practices Base Map,King County(1990) Sensitive Areas Map Folio, the King County (1991) Wetlands Inventory, and the King County(2006b) iMAP. We also reviewed a series of aerial photographs (Table 1) to assist in the definition of historical and existing plant communities, drainage patterns, and land use. 2.2.2 Endangered,Threatened, Sensitive, and Other Priority Species We requested information from Washington Department of Fish and Wildlife (WDFW 2006) for documentation on the likelihood for occurrence of Priority Species and Habitats (PHS) on the project area and vicinity from their PHS/HRTG database. State priority species are defined as those fish and wildlife species "requiring protective measures and/or management guidelines to ensure their perpetuation" (WDFW 1999). State priority habitats are defined as habitat types `�vith unique or significant value to many i species" (WDFW 1999). In addition, we requested a WDNR (2006b)Natural Heritage Information System database search for the presence of any documented rare plants or high-quality native ecosystems within the vicinity of the project. We also consulted King County iMAP (2006b) for the occurrence of Wildlife Habitat Networks on or adjacent to the site. Wildlife Habitat Networks are natural azeas that have been identified by King County to provide linkages between habitats for wildlife movement (King County 2004). Delaney Park Raedeke Associates,Inc. Wetland and Wildlife Assessment July 19, 2007 4 In addition, lists maintained by the USFWS (2005) and the WDFW(1999, as updated in 2006) were consulted for information on the occurrence and habitat relationships of wildlife species of special concern that might use the site during at least some part of the year. Species accounts (including citations above) and management recommendations (e.g., Rodrick and Milner 1991,Lazsen 1997, Larsen et al. 2004)were consulted to determine habitat preference of such species and to evaluate the likelihood of their occurrence on the project site. 2.3 FIELD SAMPLING PROCEDURES AND DATA ANALYSIS 2.3.1 Wetlands Raedeke Associates, Inc. staff investigated the Delaney Park property on Apri125, 2006 to identify and delineate any wetlands on the property. In the two weeks prior to our site visit, at least 1.36 inches of rain was recorded at Seattle-Tacoma Airport, most of which fell prior to April 21, 2006 (Seattle Times 2006). During our field investigations,we used information from the background studies to assist us in the examination of the study area. We examined potential wetland areas and streams as identified on the reference maps. During our investigations,we inventoried, classified, and described representative areas of plant communities and soil and hydrologic conditions in both the wetlands and adjacent uplands. We searched specifically for areas with positive indicators of hydrophytic vegetation, hydric soil, and wetland hydrology. We used the Braun-Blanquet cover-abundance scale and a plot-less sampling technique to describe homogeneous plant "cover types"in both the wetlands and uplands (Mueller-Dombois and Ellenberg 1974). A detailed description of vegetation sampling and analysis is found in Appendix A. Vegetation nomenclature of plant species (Table B.1) follows Hitchcock and Cronquist (1976), as updated by USDA NRCS (2007). Wetland cover types were classified according to Cowardin et al. (1992). Two quantitative indices v��ere used to analyze vegetation data in order to determine if the plant community meets the definition of"hydrophytic vegetation." The first index represents the percentage of dominant species with a WIS rating of facultative or wetter. A species v�rith a cover class value of 2 (5% -25%canopy cover) or greater on the Braun- Blanquet scale was considered a dominant. The second vegetation index was a weighted mean of the WIS ratings, after Wentworth and Johnson(1986). This weighted mean index (WMn calculates the average WIS rating of all species in the plot by weighting each species based upon its relative cover. The W�1�I is a measure of the plant community's adaptation to saturated soil conditions Delaney Park Raedeke Associates, Inc. Wetland and R�ildlife Assessmeiat July 19, 2007 5 , (Wentworth and Johnson 1986). The WMI provides an objective parameter for determining whether a plant community is indicative of wetland or upland conditions. Ideally, the "breakpoint"between wetland and upland vegetation is a weighted mean i index of 3.0, with wetland vegetation characteristics indicated by a WMI less than 3.0 and I upland vegetation characteristics indicated by a WMI greater than 3.0. When the weighted mean index is near 3.0, however, vegetation may not clearly indicate whether an area is wetland or upland. In such cases, soil and hydrologic conditions must be carefully considered. As the weighted mean index of a plant community or plot approaches either extreme on the scale(i.e., approaching 1.0 or 5.0), the probability of the vegetation indicating wetland or upland,respectively, increases. Wentworth and Johnson (1986) confirmed the effectiveness of this methodology for a wide variety of plant communities in different regions of the United States. We excavated pits to at least 16 inches below the soil surface where possible in order to describe the soil and hydrologic conditions throughout the site. We sampled soil at locations that corresponded with vegetation sampling areas. Colors of the soils were deternuned using the Munsell Soil Color Chart (Munsell Color 2000). Wetland boundaries were established based on the presence of hydric soil,hydrophytic vegetation, and indicators of wetland hydrology. Topographic changes within the context of the landscape were used to aid in the placement of the wetland boundaries. We placed pink and black diagonally-striped plastic flagging or orange and yellow pin flags to represent the outer edge of all wetlands found on the study area. The boundaries of the on-site wetlands flagged by Raedeke Associates, Inc. were surveyed in the field by professional surveyors at Mead Gilman and Associates and plotted on base maps. The survey information was received in our office from CPH Consultants on December 5, 2006. 2.3.2 Wildlife Inventorv We investigated wildlife use of the site through direct field observations and through compilation of information about the site provided by local agencies and published sources. We used the King County(1987) Wildlife Habitat Profile to provide information on species-habitat preferences in order to evaluate the likelihood of the occurrence of additional wildlife species not observed on-site. We consulted additional information on wildlife-habitat relationships (Johnson and O'Nei12001) and on specific animal groups, including Hunn(1982), Penland (1984), Smith et al. (1997), and Wahl and Paulson (1994) for birds, Guenther and Kucera(1978) and Johnson and Cassidy (1997) for mammals, and Brown et al. (1995),Dvornich et al. (1997), Leonard et al. (1993), and Nussbaum et al. (1983) for reptiles and amphibians. We also extrapolated from our research and management experience in the Puget Sound lowlands to place the observations made at the site into a broader framework. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 6 Habitat reconnaissance efforts were conducted on October 19, 2006. During this field investigation, animal presence and sign was documented while describing plant communities and habitats. We recorded information regarding habitat use and activities of all v��ildlife species observed. Such information included concentrations of animals and special habitat features such as large trees, snags (standing dead or partially dead trees), or large do«�ned logs. 2.3.3 Endangered, Threatened, Sensitive, and Other Priority Species During our October 19, 2006 wildlife survey,we also searched for the presence or sign of any endangered, threatened, sensitive, or other priority plant and animal species suspected to occur on the project area or vicinity. Particular attention was paid to use of the site by raptors and woodpeckers, as these are the most likely of the threatened, endangered, or priority species to occur on or within the vicinity of the project area. Trees within the site were surveyed for nesting activity by raptors or cavity nesters (such as the pileated woodpecker) and for the presence of raptor nests or woodpecker nesting cavities. Delaney Paf•k Raedeke Associates, Inc. i3'etland and Wildlife Assessment July 19, 2007 . � 3.0 EXISTING CONDITIONS 3.1 RESULTS OF BACKGROtiND INVESTTGATION 3.1.1 Wetlands Natior:al Wetland Inventory The USFWS NWI(2006) online map depicts a small palustrine, forested, seasonally flooded (PFOC) wetland in the northwest corner of the project site (Figure 3). Several other small, isolated, palustrine forested(PFO),palustrine scrub-shrub (PSS) and palustrine, emergent(PEM)wetlands are depicted v��ithin half a mile of the site. Soil Conservation Service Maps According to the USDA NRCS (2006) Web Soil Survey, the east half of the property is mapped as Alderwood gravelly sandy loam, 6%to 15% slopes (Map Symbol AgC; Figure 4). This soil series extends at least 1,000 feet upslope to the east of the project site. The west half of the site is mapped Alderwood gravelly sandy loam, 0%to 6% slopes Map Symbol AgB); this soil series extends off-site to the west before becoming Alderwood gravelly sandy loam, 6%to 15% slopes. The Alderwood soil series is comprised of moderately well-drained, non-hydric soils formed in glacial deposits underlain by glacial till at a depth of 24 to 40 inches (Snyder et al. 1973; Federal Register 1995). Some areas in the Alderwood series may have inclusions of hydric soils such as Iv'orma, Bellingham, Seattle, Tukwila, and Shalcar soils. Fish Distribution Maps The Washington Department of Natural Resources (WDNR 2006a)Forest Practices Activity Map (Figure 5) for the project site shows a Type F (fishbearing) stream located in the west portion of the site. According to the WDNR(2006) map, the Type F stream originates north of the project site and flows south to the Cedar River. No other streams or other state waters are depicted in the study area. See Table 2 for a summary of the definitions of state water types. The Streamnet (2006) and interacti�Je mapper does not depict anadromous or resident fish use within any portion of the Delaney Park site. Ki�zg County Inventories The King County(1990) Sensitive Areas Maps Folio identifies a small wetland in the northwest portion of the site as wetland "May Creek 24b" (Figure 6), which corresponds in size and location to the PFOC wetland mapped by the USFWS (2006, Figure 3). The King County(1990) Sensitive Areas Maps folio indicates that wetlands designated with a "b" have not been field verified, and the King Count��(1991) Wetland lnventory does not Delaney Park Raedeke Associates, Inc. ii'etland ar:d i�'ildlife Assessment Jul}'19, 200' 8 describe "May Creek 24b." No other wetlands or streams are depicted on the project site in the King County(1990) Sensitive Areas Maps folio. The King County(2006b) iMAP (Figure 7) for sensitive areas and hydrographic information also depicts a small, uncategorized wetland in the west portion of the proj ect site that generally corresponds in size and location to the USFWS NWI (2006) and King County(1990) Sensitive Areas Folio. An unclassified stream is depicted originating south of the inventoried wetland and flowing north through the inventoried wetland. The unclassified stream is depicted flowing at least a mile to the north to May Creek, as opposed to the WDNR(2006) map,which shows the stream flowing south to Cedar River. While the location of the King County(2006) stream is generally consistent with No wildlife habitat corridors are shown on or in the vicinity of the project site. The King County(2006b) iMAP indicates the project site is located in a basin designated as having high basin condition value. 3.1.2 Endangered, Threatened, Sensitive, and Other Priority Species and Habitats The WDFW (2006) PHS map does not show any priority habitats or species on or adjacent to the project site. The PHS map depicts priority anadromous fish presence and I priority resident fish presence within 1.5 miles to the northeast (May Creek), northwest (Honeydew Creek), and southwest(Cedar River) of the Delaney Park property. In addition to the NWI mapped wetlands discussed above, priority habitat and species polygons mapped within the vicinity of the project site include the May Creek mixed forest riparian zone located approximately 1.5 miles to northwest and a large tract of Urban Natural Open Space associated with the Cedar River located approximately 1.0 miles to the southwest. Results of the WDNR(2006b)Natural Heritage Information System database search indicate there are no records of rare plants or high quality native ecosystems within or in the vicinity of the Delaney Park site. 3.2 GENERAL STUDY AREA DESCRIPTION The Delaney Park site is located in the upper portion of the May Creek drainage basin, within the Cedar River-Lake Washington watershed(King County 2006a). Based on the topography depicted on the King County(2006b) iMAP, the total contributing sub-basin to the project site extends upslope to the east from the site and is approximately 13 acres in size. The property lies on a west-facing slope that ranges in elevation from approximately 518 feet above sea level at the east end of the site to 446 feet in the west end of the site. The east half of the site has an average slope gradient of 10%, whereas the«est half of the site has an average slope of less than 2%. Delaney Park Raedeke Associates, Inc. T�Y"etland and Wildlife.Assessment July�19, 2007 9 j The eastern portion of the project site consists of several single-family residences with associated lawns and driveways. An access road from 148�'Avenue SE bisects the east portion of the site. The north-central portion of the site is an active horse pasture with scattered coniferous and deciduous trees. The south-central portion of the site consists of mowed lawn with some scattered conifers. The west half of the site consists of several wetlands interspersed between mowed grassland; portions of the v�retlands encountered also appeared to be regularly mowed. The perimeter of the project site is bounded by electrical and wire fencing, and the north and south half of the project site is bisected by wire fencing. Surrounding land use includes the Shamrock Heights subdivision to the south and the Wedgewood Lane development to the west. At the time of our Apri12006 site visit,these areas had been cleared and graded. A few single-family residences are located adjacent to the northeast of the Delaney Park site, and the remainder of the land north of the site is undeveloped forest and riparian comdor. Aerial photographs (Table 1) show that in 1970 a majority of Delaney Park site was forested. The central access road from 148�'Avenue SE was visible, and the south- central portion of the site had been cleared. A couple of single-family residences and other structures are visible in the east portion of the site. The 1981 aerial photographs show that more forested and shrub vegetation had been cleared in the south/southwest portion of the site. Few additional houses or other structures were visible. By 1989, most of the southwest and north-central portions of the site had been cleaxed of woody vegetation, and replaced with grassy vegetation. A dirt path extending west from the central access road to the west site boundary is visible. A majority of the single-family residences, associated structures and landscaping we observed during our 2006 site visit were present by 1989. The 2001 aerial photos indicate no additional land modifications have occurred since 1989. 3.3 WETLAND DESCRIPTIOnS Based on our April 25, 2006 field investigation, vve identified and delineated four wetlands (Wetlands A,B, C and D)on the Delaney Park site (Figure 8, Table 3). We did not identify any streams on-site. Following is a detailed description of the wetlands, including vegetation, soil, and hydrology. 3.3.1 VVetland A Wetland A is located in the southwest corner of the site (Figure 8) and totals 0.41 acres (17,709 square feet) in size. The hydrogeomorphic (HGIv� classification of Wetland A is slope in the eastern portion of the wetland and depressional in the western portion. Overall, the depressional HGM class comprises at least 10% of Wetland A. A dirt path at the north end of Wetland A divides Wetland A from Wetland B. A 10-inch-diameter Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 10 corrugated metal pipe under the dirt path connects Wetlands A and B;we observed a level surface water connection between Wetland A and B during our Apri12006 site visit. V4'etland A is bounded on the south side by another dirt path that divides Wetland A from a wetland off-site to the south. Wetland A has a level hydrologic connection with the off- site wetland via a 10-inch-diameter corrugated pipe. Based upon the aerial photo review described above, the dirt paths likely«•ere constructed beh��een 1981 and 1989. Vegetation The slope portion of Wetland A consists mainly of bluegrass, mosses and common vel��etgrass that appeared to have been mowed (Sample Plot [SP] 2, Table B.2). The central depressional portion of Wetland A consists of various emergent species including s«�amp smartweed, fowl mannagrass,three-petal bedstraw, and skullcap speedwell, among others (SP 3, Table B.3). Soils and Hydrology The soils in the slope portion of Wetland A are comprised of 9 inches of black (lOYR 2/1) soil over at least 6 inches of very dark grayish brown(lOYR 3/2) soil with redoximorphic features; soil texture was not characterized at this Sample Plot(SP 2, Table B.2). Soils were saturated at the surface and free water was present at 11 inches at the time of our April 25, 2006 site visit. The depression in the westem portion of Wetland A had 7 inches of inundation; soils were not sampled but are assumed to be hydric due to inundation during the growing season. According to the property owner, Wetland A dries out during the latter part of the growing season (Mr. Brian Berg, pers. comm. Apri125, 2006). Determination and Classification Positive indicators for dominance by hydrophytic vegetation, hydric soil, and wetland hydrology were present within the wetland during our April 25, 2006 field investigation. Therefore, the delineated area met necessary criteria to be considered wetland under guidelines of the WDOE (1997) delineation manual. Wetland A has less than 30%cover by tree and/or shrub species; thus, the wetland would be classified as a palustrine, emergent,persistent(PEM1)wetland according to the USFWS wetland classification system(Cowardin et al. 1992). Adjacent Uplands The adjacent uplands upslope to the east of Wetland A are dominated by poa and mosses (SP 1, Table B.4). The soil profile within the adjacent upland featured ten inches of black � (lOYR 2/1) gravelly sandy loam over at least five inches of dark yellowish brown{lOYR 3!4) gravelly sandy loam with redoximorphic features (Table B.4). Soils were saturated � at 10 inches, and free water was present at 15 inches during our April 25, 2006 site visit. I Delanev Park Raedeke Associates, Inc. GT'etland and YYildlife Assessment July 19, 2007 11 Wetland A was differentiated from the adj acent uplands primarily by the presence of hydric soils and soil saturation within a major portion of the root zone, which were found within the wetland but not in the upland. 3.3.2 Wetland B The on-site portion of Wetland B and is located directly north of Wetland A(Figure 8), and totals 0.42 acres (18,482 square feet) on-site. As previously mentioned, Wetland B has a level surface water connection with Wetland A via a 10-inch corrugated metal culvert undemeath the dirt path that divides Wetland A from Wetland B. The HGM class of Wetland B is depressional. Based on visual observations made from roads to the west and north of the Delaney Park site, Wetland B appears to continue off-site to the north for at least 50 feet. While no stream channel was observed in the on-site portion of Wetland B or immediately off-site to the north, surface water from 4�'etland B eventually collects in a stream channel that flows north for at least 0.25 miles. We were not able to confirm whether or not the stream drains directly into May Creek. Vegetatio�: A majority of the on-site portion of Wetland B consists of dense salmonberry, rose spirea, and twinberry honeysuckle, as well as patches of red alder and western red cedar trees (SP 8, Table B.5). Porti�ns of the eastern edge of Wetland B mainly consist of bentgrass, common rush, mosses, and scattered Himalayan blackberry(SP 5, Table B.6). Based on our visual observations of off-site portions of Wetland B north of the project site, vegetation mainly consists of willows and black cottonwood trees, as well as hardhack spirea. Soils and Hydrology Soils in the west-central portion of Wetland B could not be sampled due to the presence of over 4 inches of standing water; howe��er, soils are assumed to be hydric due to inundation during the growing season. Soils on the eastern edge consist of 12 inches of black (lOYR 2/1) fine sandy loam over at least 4 inches of dark brown (lOYR 3/3) loamy sand (Table B.6). We observed mucky soils less than 2 inches below the ground surface in other portions of Vdetland B. Soils were saturated at 2 inches below the surface and free water was present at 8 inches below the surface during our April 25, 2006 site visit. Determination, and Classification Based on our observations, positive indicators for each of the three wetland parameters were present; therefore, Wetland B meets the necessary criteria to be considered wetland according to the guidelines of the WDOE (1997) delineation manual. The on-site portion Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 12 of Wetland B is palustrine, scrub-shrub,broad-leaved deciduous (PSS1) wetland according to the USFWS (Covvardin et al. 1992)wetland classification system. Overall, there likely is greater than 30% cover by trees in off-site portion of Wetland B and therefore would be classified as a palustrine, forested,broad-leaved deciduous (PFO1) wetland accordina to the L'SFVG'S (Cowardin et al. 1992)wetland classification s}�stem. Adjacent Uplands Uplands adjacent to Wetland B were differentiated from the wetland primarily by a distinct topographic break along the eastem and western wetland boundaries, as well as b}�the absence of indicators of surface hydrology, soil saturation, and/or lack of dominant hydrophitic vegetation. Uplands immediately adjacent to the east of Wetland B consist mainly of cut-leaf blackberry and bentgrass,with scattered salmonberry sprouts, common velvet-grass, and common nzsh (SP 7, Table B.7). Vegetation in the uplands west of Wetland B consists mainly of mowed grasses. Soils within the upland area east of Wetland B generally consist of 4 inches of black(lOYR 2/1) sandy loam over at least 12 inches of dark yellowish bro«�n (lOYR 4/4) gravelly sandy loam with redoximorphic features (Table B.7). Soils were saturated at 6 inches and free water was present at 12 inches. However, due to lack of hydric soils and dominant hydrophitic vegetation, we did not consider this area wetland. 3.3.3 Wetland C The on-site portion of Wetland C is located upslope and directly east of Wetland B, in the north-central portion of the site (Figure 8), and totals 0.35 acres (15,066 square feet) on- site. The hydrogeomorphic (HGM) classification of Wetland C is slope in the eastern portion of the wetland and flats/depressional in the north-central portion. Overall, the depressional HGM class comprises less than 10% of Wetland C. Based on observations from the north property boundary, Wetland C continues off-site to the north; however, we could not determine ho«� far Wetland C extends off-site. Vegetatiori A majority of Wetland C is pasture comprised of bluegrass and other grasses (SP 16, Table B.8). Over 30% of the pasture is bare ground, likely due to heavy trampling and grazing from horses. Wetland C has patches of black cottonwood and red alder trees and saplings,with an understory of creeping buttercup,common ladyfern, bigflower tellima, and grasses (SP 10, Table B.9). Soils and Hydrology Soils within the east portion of Wetland C consist of 16 inches of black (lOYR 2/1) gravelly sandy loam with redoximorphic features throughout the profile (Table B.8). At the time of our Apri125, 2006 site visit, soils in this area were saturated at 12 inches and free«�ater«-as present at 16 inches. Soils in the northwest portion of R�etland C consist Delaney Park Raedeke Associates, Inc. i�''etland and u'ildlife Assessment Jul1� 19, 2007 13 of at least 15 inches of very dark grayish brown (lOYR 3/2) sandy loam with redoximorphic features (Table B.9). Soils were saturated at 9 inches and had free water at 12 inches on Apri125, 2006. Because these areas had hydric soils and a vegetation community dominated by hydrophitic vegetation, we assumed saturation is present within a major portion of the root zone during the early part of the growing season. We observed less than an inch of inundation in puddles throughout Wetland C. Determination and Classification Based on our observations, positive indicators for each of the three wetland parameters were present; therefore, Wetland C meets the necessary criteria to be co�:s�d�red «etlanc3 according to the guidelines of the WDOE (1997) delineation manual. Overall, Wetland C has 30% cover by a combination of tree and sapling species, and would be a palustrine, scrub-shrub,broad-leaved deciduous (PSS1)wetland according to the USFWS wetland classification system (Cowardin et al. 1992). There are also distinct patches ofpalustrine, emer�ent. ners;stent (PE'��1]1 �-eQe±ation that comn�-ise at least l �° of the total wetland are,: Adjacent Uplancl� Uplands surrounding the eastern and westem portions oi��etland C also consist o- pasture dominated by poa species (SP 12, SP 14; Tables B.10 and B.11). Soils adj acent to the west of Wetland C consist of 9 inches of very dark brown(lOYR 2/2) soil v�Tith redoximorphic features over at least 7 inches of dark brown(lOYR 3/3) soil with redoximorphic features (Table B.10). Soil saturation was present at 9 inches, and free water was present at 16 inches during our Apri125,2006 site visit. Soils east of Wetland C consist of six inches of black(l 0YR 2/1) sandy loam over 2 inches of yellowish red (SYR 4/6) loamy sand, over 8 inches of very dark brown(lOYR 2/2) sandy loam. Soils were saturated at 13 inches, and free water was present at 16 inches. Wetland C was differentiated from the adjacent uplands by the presence of indicators for all three wetland criteria. 3.3.4 Wetland D The on-site portion of Wetland D and is located in the south-central portion of the site (Figure 8), and totals 0.05 acres (2,164 square feet) in size. Wetland D is a depressional wetland, and extends off-site to the south into a Native Growth Protection Area(NGPA} ' in the Shamrock Heights development. Yegetation The on-site portion of Wetland D consists of mainly of bluegrasses that appear to be regulazly mowed(SP 20, Table B.12). Other herbaceous species present in this area include creeping buttercup, mint, and white clover. The off-site portion of Wetland D is Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 14 dominated by black cottonwood trees and an understory of salmonberry, rose spirea, and Himalayan blackberry. Soils and Hydrology Soils at the north edge of Wetland D consist of 4 inches of dark grayish brown(lOYR 4/2) fine sandy loam over 2 inches of gray(2.SY 5/1) loamy sand over 6 inches of black (lOYR 2/1) fine sandy loam(Table B.12). Soils were saturated at approximately 8 inches at the edge of Wetland D, and free water was present at 14 inches. Because this area had hydric soils and a vegetation community dominated by hydrophitic vegetation,we assumed saturation is present within a major portion of the root zone during the early part of the gro«�ing season. Deternii�zation, a�:d Classificatio�r B1SP,d 011 Otll'ObS0NSt10TLS�POSltlV�� iIi�i�alU?'S jUI" :3CI1 U1 �i1C i�li.:� A��:IillIl� �7,lI��iII1�:1�:�� were present; therefore, Wetland D meets the necessary criteria to be considered wetland according to the guidelines of the WDOE (1997) delineation manual. Overall, there is likely greater than 30% tree cover in the off-site portion of Wetland D; therefore, Wetland D would is a palustrine, forested, broad-leaved deciduous (PFO1)wetland according to the USFWS (Cowardin et al. 1992)wetland classification system. The on-site portion of Wetland D consists of palustrine, emergent,persistent (PEM1) vegetation, which appears to comprise less than 10% of the total wetland area. Adjacent Uplands Uplands adjacent to Wetland D were differentiated from the wetland by the lack of one or more indicators of wetland criteria, in particular hydric soils. Uplands immediately adjacent to the east of Wetland D also consist mainly of common velvetgrass that appears to be regularly mowed(SP 22,Table B.13). Soils within the upland area north of Wetland D generally consist of 6 inches of very dark brown (lOYR 2/2) fine sandy loam over at least 10 inches of dark brown(lOYR 3/3) fine sandy loam with some mottles present (Table B.13). Soils were saturated near the surface and free water was present at 13 inches during our Apri125, 2006 site visit. However, due to lack of hydric soils, we did not consider this area��etland. 3.4 UPLAND DESCRIPTIOVS In addition to the palustrine, forested, broad-leaved deciduous (PFO1), palustrine, scrub- shrub, broad-leaved deciduous (PSS1) and palustrine, emergent, persistent (PEM1) wetland plant communities identified on the Delaney Park site (described above),we identified three distinct upland cover types: Pasture(A), Shrubland (S), single-family residential(Urban), and Mowed grassland (Gma; Figure 8). These communities are described in the sections below. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 15 The south-central portion of the site consists of mowed grasses and other herbaceous species. Large (>32 inches dbh)native conifers, including Douglas-fir,western red cedar, and western hemlock, are dominant in the eastern portion of this area. Based on auger samples of soils throughout this area, we saw no indicators of hydric soil or wetland hydrology. 3.4.1 Grazed Pasture (A) The northeastern portion of the project site is dominated by horse pasture (Figure 8). Several buildulgs includmg a barn, stable, sheds and a smgle family home aze situated m I the northeastern portion of the site. Vegetation within the pasture is primarily dominated by grasses and weedy species such as bitter dock and stinking willie, sparsely scattered Douglas-fir trees, and scattered patches of shrubs including common snowberry, cut-leaf blackberry, and Himalayan blackberry(SP 2-A, Table B-14). Trees and shrubs become more dominant in the westem portion of the pasture. Vegetation in the pasture is heavily disturbed by trampling and grazing by horses, and large patches of bare ground are present. We were not able to identify many of the grass or herbaceous species, nor get soils samples during our field surveys due to their disturbed condition; however,we did not see any primary or secondary indicators of inundation in this portion of the site during our Apri12006 site visit. 3.4.2 Shrubland (S) Scattered patches of shrubland are located in the north-central portion of the site between the horse pasture to the east and the forested upland buffer of wetland B to the west (Figure 8). Shrub patches are dominated by red alder and western red cedar saplings, and Himalayan and cut-leaf blackberry. A few large trees, including black cottonwood and red alder are scattered throu�hout the area. 3.4.3 Urban (i� The southeastern portion of the site consists of several single-family homes with associated lawns and driveways (Figure 8). Previously cleared areas around existing houses are generally dominated by ornamental trees andlor shrubs, lawn grasses, and herbaceous weeds, with scattered Himalayan blackberry. Large trees including Douglas- fir and Lombardy poplar are located around the eastern and southern perimeter of this portion of the site. 3.4.4 Mowed grassland (Gm) • The south-central portion of the site consists of mowed grasses and other herbaceous species, with several small sheds scattered throughout (Figure 8). Large (>32"dbh) native conifers including Douglas-fir,western red cedar, and western hemlock are dominant in the eastern portion of this region(SP 1-A, Table B.15). V4'e were not able to identify Delaney Park Raedeke Associates, Inc. i�i'etland and i�'ildlife Assessment July 19, 2007 16 many of the grasses or herbaceous species during our field survey due to their mowed condition. 3.5 SPECIAL HABITAT FEATURES Special habitat features include biologic elements such as edges between plant communities or successional stages, cliffs, snags, and coarse woody debris, which are often important to wildlife (Brown 1985, Thomas and Verner 1986). Distinct edges on the Delaney Park property are created by roadways along the western and eastern site boundaries, and clearing for residential development along the southern site boundary. Within the site, a distinct edge exists along the property line between Wetlands A and B as a result of the historic clearing of Wetland A. Diffuse edges are created by landscaping and driveways associated with residential or agricultural areas within the site. Densely scattered patches of trees and shrubs create a diffuse edge between the wetlands and adjacent uplands and the horse pasture. Snags (dead or partly dead trees at least 4 inches diameter at breast height [dbh] and 6 feet tall) are important to many wildlife species for nesting, feeding, and roosting (Cross 1986,Neitro et al. 1985, Scott et al. 1977 in Ohmart and Anderson 1986). Snags (primarily dead red alders)were present��ithin the Delaney Park site. The highest density of snags was observed within the wetlands and adjacent uplands. However, some snags were also present in other upland areas in the western portion of the property. Additional snags were documented in the wetlands and adjacent uplands that continue offsite to the north. Coarse «�oody debris includes do«ned logs and major limbs of trees 1}�in� on the ground. Downed logs can enhance habitat value by providing perch sites, food sources, nest cavities, and cover for many species, such as woodpeckers, small mammals, and some amphibians (Jones 1986, Carey and Johnson 1995). Coarse woody debris was present in a variety of sizes and decay classes, and v��as primarily located within the wetlands and adjacent uplands. 3.fi «'ILDLIFE The�;�etlands, buffers, and large trees present within the Delaney Park site provide habitat for a variety of wildlife species. These areas provide habitat for resident wildlife, including birds, mammals, reptiles, and amphibians, and may also act as "stepping stones" or avenues of movement for migrating birds. Comparatively, the pasture and residential areas provide habitat for fewer wildlife species, and therefore have less value as wildlife habitat. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 17 Based on reference lists from similar habitats in western Washington, a number of species could occur in any of the habitats encountered (King County 1987); however, the actual number of species found in the habitats on the project site is limited to some degree by the size of the site and patches of associated vegetation cover types and the presence of urbanization on three sides of the property. Because the field investigation was conducted outside the breeding season in October, and because of the secretive habits of many wildlife species, only a portion of the species expected to use the on-site habitats were actually observed or detected(Table 4). 3.6.1 Reptiles and Amphibians Most reptiles and amphibians are secretive and seldom observed, except during short periods in their life cycles, and thus require special techniques to inventory• adequately. No formal searches or sampling were conducted for reptiles or amphibians. A Pacific treefrog was the only amphibian observed on-site, and no reptiles were observed. Wetlands A and B and adjacent uplands may provide some habitat for amphibians. Wetlands A and B likely provide breeding habitat for aquatic breeding amphibians, and adult amphibians could occupy the forested uplands of the site during the remainder of the year. Pasture, lawn, and residential areas may provide habitat for garter snakes. 3.6.2 Birds Raedeke Associates, Inc. staff observed fifteen bird species during our field visit at the Delaney Park property. However, additional species could be expected to occur in all habitats during different times of year(King County 1987). The project site has no open water habitat, which precludes most shorebird, waterfowl, and wading birds from using the property, except those that occur incidentally flying over the site. Of these, only glaucous-winged b lls were observed flying over the property. Raptors are typically large, predaton�birds including o��ls, ha«ks; and falcons, «hich range over relatively large home ranges. The wetlands and associated uplands on the Delaney Park site have some connectivity to undeveloped areas to the north. In addition, portions of the Delaney Park property contain large trees and snags suitable for breeding and/or foraging. Thus, there is the possibility that the site may be used as breeding and foraging habitat by raptors. However, no cavities large enough to be used by cavity- nesting raptors (such as small owls) or aerial raptor nests were detected on-site, and no raptors were observed during our field visit. Woodpeckers glean insects and larvae from on or under the bark of trees and snags. All are forest cavity-nesting species that excavate their own nests (primary cavity-nesters). One small (2-3 in. diameter)woodpecker cavity was observed on the Delaney Park site, ��rhich may have been excavated by a flicker or hairy woodpecker. I�'o si�s of recent use Delaney Park Raedeke Associares, Inc. Yi'etla�id and ti�'ildlife Assessment Juli•19, 2007 18 were evident, although the cavity may be used for nesting and/or cover by a variety of species. Pileated woodpecker foraging sign was noted on snags and coarse woody debris scattered throughout the western portion of the site, some of which appeared to be fresh. However, we did not observe any woodpeckers on the Delaney Park property during our October field visit. A Pileated«�oodpecker was observed in Wetland B during our field visit on April 25, 2006. Passerines, or perching birds, are generally small birds that exhibit a wide range of feeding modes and breeding strategies. The trees and shrubs on the property are likely used by many species �f passerines throughout the year as nesting, perching, foraging, and migratory habitat. During our October field visit, small flocks that included American robins, house finches,house sparrows, American goldfinches, chestnut-backed chickadees, black-capped chickadees,bushtits, Stellar's jays, and spotted towhees were observed foraging and perching on trees and shrubs scattered throughout the property. Bewick's wrens, golden-crowned kinglets, and a brown creeper were observed within Wetland A/B and adjacent uplands. 3.6.3 Mammals Most habitats within the site probably support a variety of mammals. They are less frequently observed than birds because of their generally secretive and nocturnal habi Moles likely live in some of the lawn areas in the residential portions of the site. Introduced house mice as well as Norwa and black rats aze common mammals ada� � Y � to live in association with humans. Eastern gray squirrels, raccoons, and opossums a1 31S0Il�iti_ :�` �:;� ��? . .�.. ., ��.�. �1�.. �11��i� .:1;� l�l: LII,�','\..��:� ��OI:=��i ��T 'fi�� Ci:.�- Park site. The wetland and forested uplands have dense shrub and ground cover in parts, and ha��e scattered deposits of coarse woody debris. Areas with better cover likely provide some habitat for sma11 mammals such as shrews, voles, mice, and rats. These species are an important food source for predatory birds. Small mammal numbers are probably more limited in areas sunounded by urban habitats due to the presence of domestic dogs and cats, which can be highly effective predators on native species (Penland 1984). No carnivores or their sign(footprints, scat)were observed, though as previously mentioned, raccoons are likely present. Because the area is fairly small and surrounded by urban development, as well as the presence of perimeter fencing (some of which is I electrified), it is unlikely that the site provides habitat for larger predators like bobcats or �i black bears. However, coyotes are better acclimated to living in proximity to humans and may visit the site. Domestic cats and dogs can be significant predators on species found in proximity to human dwellings, and are likely to hunt on the Delaney Park properly and contiguous habitats. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 19 3.7 ENDANGERED,THREATENED,SENSITIVE�AND OTHER PRIORITY SPECIES A'�'D HABITATS The Washington Department of Fish and Wildlife(2006) shows no records of federal- or state-listed endangered, threatened, or sensitive species of birds, maminals, reptiles, or amphibians present on the Delaney Park site. Raedeke Associates, Inc. did not observe any of these listed species on the project site during our field visit conducted in October 2006. The WTDFW(1999) lists species as "Priority" for management and conservation other than those legally designated as endangered,threatened, and sensitive (WAC 232-12-011, -014). State Priority species designations include candidate,monitor, and game species. State candidate species are those fish and wildlife species that "will be reviewed by the WDFW (POL-M-6001) for possible listing as endangered, threatened, or sensitive according to the process and criteria defined in WAC-232-12-297" (WDFW 1999). The WDFW(1999) also lists habitats as"Priorit�' for management and conservation. State priority habitats are those habitat types or elements with"unique or significant value to a diverse assemblage of species," and may consist of a"unique vegetation type or dominant plant species, a described successional stage, or a specific structural element". The WDFW (1999) identifies snags greater than 20 inches in diameter at breast heig}7 (dbh) and 6.5 feet in height as priority habitat. Most snags on the Delaney Park site a bet��een 12 to 16 inches dbh. However, several snags on the property meet the criteri�; �_� be considered priority habitat. Priority snags on the Delaney Park site are primarily between 20 to 24 inches dbh; one snag measured approximately 32 inches dbh. Priority snags «7ere located primarily within the wetlands and associated upland buffers (Figure 8). We did not identify any other priority habitats on the Delaney Park site. Foraging sign of one state candidate species,the pileated woodpecker, was detected on ' the site. Many snags showed pileated woodpecker foraging sign, some of which appeared to be fairly recent. Pileated woodpecker nest trees average 27" (no range reported) and 40" (range 26-61") dbh in westem Oregon and the Olympic Peninsula,respectively, and roost trees averaged 44"(range 16-82") and 59" (range 15-122") dbh in the same locations (Lewis and Azerrad 2003). Thus, the largest snags documented on the Delaney Park property could potentially be used by pileated woodpeckers for roosting and nesting. However, no pileated woodpeckers, or roost or nest cavities thereof, were actually obsen�ed during our field visit, and therefore the site would not be considered to be an active breeding site for this species. It is likely that the Delaney Park property is a peripheral portion of a larger territory for birds inhabiting the heavily wooded wetlands and adjacent uplands to the north. Pileated woodpeckers in western Oregon and on the Olympic Peninsula in Washington have been documented as having average home range sizes of 1,186 and 2,132 acres,respectively(Lewis and Azerrad 2003). Thus, the 8.84- Delaneti�Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 20 acres of land on the Delaney Park site would provide a relatively small portion of an overall home range of a pair of pileated woodpeckers. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 21 4A WETLAND FUNCTIONAL ASSESSMENT Wetlands perform significant roles in the ecosystem, some of which are of immediate value to society. These roles vary greatly with the hydrogeomorphic (HGM) classification, hydroperiod, soils, vegetation, and landscape position of the wetland. The evaluation of functions and values provided by individual wetlands combines both qualitative and quantitative analyses and is therefore typically based on professional judgment. Washington State Department of Transportation(WSDOT 2000) Wetland Functions Characterization Tool for Linear Projects qualitatively identifies functions and values that a wetland may provide. We used this tool to evaluate the functions and values of the wetlands on the Delaney Park site. The functions and values evaluated can be broadly divided into hydrologic functions,biological functions, and social values. Hydrologic functions include flood flow alteration, sediment removal,nutrient and toxicant removal, erosion control and shoreline stabilization. Biological functions include production of organic matter and its export, general habitat and its suitability, habitat for aquatic invertebrates, amphibians, selected wetland-associated mammals, and selected wetla��. ' associated birds, as well as, general fish habitat and native plant richness. ��ci�' �� :?_:. include educational or scientific value, as well as uniqueness and heritage Under the WSDOT (2000) functional assessment methodology, the potential for wetlands to provide a certain function is contingent on its HGM class. WSDOT precludes wetlands of certain HGM classes from performing certain functions, and the potential of a wetland to perform a function cannot be scaled with this assessment tool (Mr. Bill Leonard, WSDOT pers. comm. April 2, 2007). If the HGM class of a wetland indicates potential to provide a function, the wetland is further evaluated based on a suite of chazacteristics for each function. In some cases, a wetland may be considered to provide a specific function based on the evaluator's best professional judgment, even though it does not meet this tool's HGM requirements for a function or have a majority of the characteristics required for the function. 4.1 GEtiERAL DESCRIPTIO\S OF��4'ETLAND FU\CTIONS A`D �.�LLES 4.1.1 Hydrologic Functions Flood Flow Alteration Certain wetlands can reduce peak flows within streams and rivers by slowing and storing stream flow in overbank areas, and/or by holding back runoff during high water periods when it would otherwise flow directly down-gradient and increase flooding. Depressional wetlands that are located in the upper portions of the watershed, particularly those that do not have an outlet or those with constricted outlets, have the greatest Delaney Park Raedeke Associates, Inc. Wetland and Yl'ildlife Assessment July 19, 2007 22 potential for desynchronizing flood events, while riverine wetlands can dissipate energy from floodflow in floodplains. Sediment Removal Wetlands can remove sediments through their ability to reduce water velocities, thus allowing sediments to settle out of the��ater column. Wetlands that hold water for a long duration and are densely vegetated near the ground surface have the greatest potential for this function. , Nutrient and Toxicant Removal 'I Wetlands have the potential to remove nutrients, toxicants, organic compounds and nitrogen from the water column. Wetlands perform this function by trapping sediment to which fertilizers and pesticides are bound, removing of heavy metals and organic compounds by adsorption into soils that are high in clay content or organic matter, and by removing nitrogen through nitrification and de-nitrification. Typically, wetlands with the greatest potential to provide this function also perform sediment removal, have seasonal ponding to facilitate denitrification, are densely vegetated, and include areas of fine- grained or organic soils. Erosion Control and Shoreline Stabili<,ation Wetlands that perform this function must be associated with a watercourse or shoreline. Wetlands with dense, energy absorbing vegetation bordering the water course and that contain trees and shrubs that are able to «�ithstand erosive flood events, have the greatest potential to provide this function. 4.1.2 Biological Functions Production of Organic Matter and Its Export Wetlands that perform this function must both produce organic material at a high level and have a mechanism available to move it to adjacent or contiguous aquatic ecosystems. Wetlands that have a high percentage of vegetation cover(particularly if it consists of herbaceous, aquatic bed, or deciduous v��oody species) and have a large area that is seasonally inundated,with a surface water connection to a stream or other wetlands, provide this function. General Habitat Suitability This function is dependent on habitat suitability for a broad array of species as demonstrated by complex physical structure,high plant richness, high interspersion between vegetation classes, and the presence of seasonal or year-round standing water. Connectivity to other wetlands and habitats increase the potential of a wetland to perform this function. Delaney Park Raerleke Associates, Inc. Wetland and ii'ildlife,4ssessment July 19, 2007 23 Habitat for Aquatic b:vertebrates Wetlands that provide habitat for the greatest number of invertebrate species are considered to provide this function. This function is dependent on the complexity of the biologic and physical structures present, including areas of permanent or seasonal inundation with varying water depths, emergent vegetation within the ponded area, and cover such as leaf litter, woody debris, or rocks. Habitat for Ampl:ibians , Wetlands that provide this function contribute to the feeding,breeding, or refuge needs of I�' amphibians. This function is largely dependent on the availability of appropriate habitat characteristics for the various amphibian life stages, such as a diversity and stability of hydrologic regimes, vegetation class interspersion,and the availability of structure for egg-laying. Connectivity to other«�etlands and habitats increase the potential of a wetland to perform this function. Habitat for Wetland Associated Birds � Wetlands that provide this function typically are associated with open water or aquatic bed vegetation. Under the WSDOT (2000) assessment tool,wetlands that perform at a high level for this function provide habitats or life resources for certain species of wetland-associated birds, particularly waterfowl, shorebirds, and herons. This function is largely dependent on the plant structure, physical structure, the condition of buffers around the wetland, and the habitat suitability for amphibians, invertebrates, and fish. Wetlands with a closed canopy may provide a lower level of this function because access to waterfowl is limited. Habitat Suitability for Wetland-Associated Mammals Under the WSDOT (2000) assessment tool, wetland-associated mammals include beaver (Castor canadensis),muskrat(Ondatf•a zibethica),river otter(Lutra canadensis), and mink (Mustela vison). Wetlands that provide this function have wide, well-vegetated buffers, a variety of water depths with open water present, connectivity of the site to other suitable habitat, and an interspersion of vegetation and open water. Wetlands that have a high percentage of developed landscape within 1 km are generally less able to provide this function than those wetlands within less developed landscapes. General Fisli Habitat Wetlands that provide this function must be associated with a fish-bearing watercourse. Wetlands that have the opportunity to provide this function contribute to the feeding, breeding, or refuge needs of anadromous or resident fish. T'his function is largely dependent on adequate water depths, the presence of permanent or seasonal open water, Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessmeni July 19, 2Q07 24 the presence of different types of cover, the presence of spawning areas, and adequate food in the form of invertebrates. Native Plant Richness Wetlands that have diverse and mature assemblages of native plants provide this function. These wetlands are typically characterized by a high number of plant assemblages, a high numbers of native plant species, and structural elements such as a high number of vegetation strata or the presence of mature trees. Wetlands that are dominated or co- dominated by non-native species are considered to perform the function at a lower level. 4.1.3 Social Values Educatio�zal or Scientific Value Wetlands can provide this value when they have documented scientific or educational use, have public access, and have suitable parking areas available that can accommodate large groups of people. Uniqueness and Heritage Wetlands that provide this value contain documented occurrence of state or federally listed threatened or endangered species, documented critical habitat, high quality ecosystems, or priority species as designated by the U.S. Fish and Wildlife Service, the WDNR Natural Heritage Program, or WDFW Priority Habitat and Species Program. 4.2 ON-SITE WETLAI�'D FUnCTIONAL ASSESSMENTS Wetlands A and B likely provide the greatest overall of amount of biologic and hydrologic functions. Wetlands on the Delaney Park site cannot provide educational or scientific value because they are not held in public ownership. None of the wetlands provide value for uniqueness and heritage because it has not been identified by federal, state, or local agencies as containing threatened or endangered species, critical or priority habitat. A wetla.nd functional assessment is provided below for each of the on-site wetlands. Table 5 presents a summary of our determinations for the presence or absence of each function for Wetlands A through D. See Appendix C for the completed WSDOT (2000) Wetland Functions Field Data Forms. 4.2.1 Wetland A/B Hydrologic Functions Wetland A/B has the potential to provide floodwater storage and desynchronization because it is primarily a bo«�1-shaped depression that has evidence of relatively high Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessmeni July 19, 2007 25 ponding, and is located in the upper portion of the May Creek drainage basin. Wetland A/B also has high potential to remove sediments because it can hold water for a relatively long period of time and have dense vegetation to trap sediments. It is also able to remove nutrients and toxicants via sedimentation,perform denitrification, and has organic soils that can adsorb heavy metals. Wetland A/B does not dissipate floodwater energy during storm events nor provide erosion control since it is not associated with a watercourse or shoreline. Biologic Functions Wetland A/B is a relatively undisturbed wetland comprised of native vegetation that has connectivity to a large area of open space to the north of the Delane}�Park site. Thus, Wetland A/B is likely to provide some level of general habitat support and native plant species richness; however, the presence of perimeter fencing in the north, south, and central on-site portions of Wetland A/B my limit general habitat suitability for some terrestrial animals. Because surface water from Wetland A ultimately discharges to downstream habitats off-site to the north, Wetland A can provide some level of organic matter production and export. Wetland A/B appears to be at least seasonally inundated and has structural characteristics such as thin-stemmed emergent vegetation, woody and other organic debris, as well as snags; therefore, it may provide sufficient habitat for aquatic invertebrates, amphibians, wetland-associated birds. However, Wetland A/B likely does not ha��e permanent ponding and thus cannot provide habitat for wetland- associated mammals listed in WSDOT (2000). Wetland A/B does not appear to be associated with a fish-bearing stream and therefore does not provide fish habitat. 4.2.2 Wetland C Hydrologic Functions Wetland C is not likely to provide substantial wetland hydrologic functions such as flood flow alteration or sediment removal because it is situated on a slope that cannot detain substantial amounts of water; however, Wetland C is on a relatively gentle slope and thus may be able to detain some surface water in small depressions and behind hummocks. It is unlikely to provide nutrient and toxicant removal functions for the same reasons, as well as due to a lack of fine-grained mineral or organic soils. Wetland C does not provide erosion control since it is not associated with a water course or shoreline. Biologic Functions Wetland C is an unfi-agmented wetland comprised of native vegetation that has connectivity to a large area of relatively undisturbed open space. Thus, Wetland C is likely to provide some level of general habitat support and plant species richness; as v��ith Wetland A!B the presence of fencing in the north portion of the wetland may limit general habitat functions for terrestrial animals. We could not confirm if Wetland C has a surface water connection to downstream habitats to the north, so it is inconclusive Delaney Park Raedeke Associates,Inc. Wella�zd and yYildlife Assessment July 19, 2007 26 whether Wetland C provides organic matter production and export. Because Wetland C does not appear to be frequently flooded, it likely does not provide sufficient habitat for aquatic invertebrates, amphibians,wetland-associated birds, or wetland-associated mammals listed in WSDOT (2000). It is inconclusive whether Wetland C can provide fish habitat since we could not determine whether it is associated with a fish-bearing stream. 4.2.4 VVetland D Hydrologic Functions Wetland D is a closed depression, and thus may able to store v��ater for long durations and thus has potential to provide flood flow alteration function and sediment removal. However, its relatively small size and lack of evidence of ability to store large volumes of water may limit its overall potential in the watershed to provide hydrologic functions. Wetland D likely pro��ides some nitrogen removal functions since it appears to be seasonally ponded and provides nutrient and toxicant removal. However, the wetland soils we observed are mainly coarse-grained mineral soils that are not effective at toxicant adsorption. It does not provide erosion control since it is not associated with a watercourse or shoreline. Biologic Functions Wetland D is also an undisturbed wetland, and therefore provides general habitat support and native plant species richness. However, the potential of Wetland D to provide support is low due to its small size, low plant species diversity and lack of differen wetland vegetation classes (Cowardin et al. 1992), and general lack of undisturbed connectivity�Tith other habitats. Wetland D does not produce significant amounts of organic matter, and does not have direct connectivity with other aquatic systems that i11a� benefit from organic matter deposition. Wetland D does not have indicators of seasonal inundation and thus likely does not provide substantial habitat support for aquatic invertebrates, and amphibians. Wetland D does not have the potential to provide habitat for wetland-associated birds, or wetland-associated manunals. Wetland D is not associated with a fish-bearing stream and therefore does not provide fish habitat. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2407 27 5.0 REGULATORY CONSIDERATIONS Wetlands and streams are protected by Section 404 of the Federal Clean Water Act, Washington State Water Pollution Control and Shoreline Management Act state, and local policies and ordinances, such as the King County(2006a) Critical Areas code. Regulatory considerations pertinent to the Delaney Park site are discussed briefly below, but this discussion should not be considered comprehensive. Additional information may be obtained from agencies with jurisdictional responsibility for, or interest in, the site. We caution that King County has not yet confumed the boundaries or categories for wetlands on the Delaney Park site. 5.1 FEDERAL CLE�R'ATER ACT(U.S.ARMY CORPS OF ENGINEERS� Federal la«� (Section 404 of the Clean Water Act) generally discourages the discharge of dredged or fill material into waters of the U.S., including most wetlands,without a permit from the COE. The COE makes the final determination as to whether an area meets the definition of a wetland as defined by the federal government (Federal Register 1986:41251), and if it is under their jurisdiction. We should caution that the placement of fill within wetlands or other Waters of the U.S. without authorization from the COE is not advised, as the COE makes the fmal determination as to whether permits would be required for any proposed alteration. As the COE makes the final determination regarding pemutting under their jurisdiction, we recommend requesting a jurisdictional determination from the COE prior to any construction activities, if any modification of wetlands is proposed. A jurisdictional determination would also provide evaluation and confirmation of our wetland delineation by the COE. 5.2 KInG COUNTY 5.2.1 Wetlands King County regulatory considerations pertinent to wetlands on the Delaney Park site are described in the King County(2006a) Chapter 21A.24—Critical Areas. King County (2006a) classifies wetlands as Category I, II, III, and IV based on the adopted Washington State Wetland Rating System for Western Washington (Hruby 2004). The WDOE rating system (Hruby 2004) categorizes wetlands based on a wetland's rarity, its sensitivity to disturbance, the water quality, hydrologic and habitat functions it provides, and humans' ability to replace the wetland's functions. Delaney Park Raedeke Associates, Inc. j�Y''etland and YT'ildlife Assessment July 19, 2007 28 Based on our background review and analysis, Wetlands A/B, C, and D did not meet the WDOE (Hruby 2004) criteria for rare, significant,or ureplaceable wetlands. Please see , Appendix C for the complete rating forms for Wetlands A, B, C, and D. I We rated Wetland A/B as one assessment unit because: (1) the dirt path betw een ��'etland A/B is likely a manmade division, and(2)there is a level surface-v��ater connection between Wetland A and B. We also included the portion of the wetland off-site to the south of Wetland A, and the visible portion of Wetland B that extends off-site to the north. Assessment unit A/B received a high water quality functions score, a low hydrologic function score, and low to moderate habitat score of 17 points. Therefore, based on our background review and field investigations, it is our professional opinion that Wetlands A and B would be rated as Category III wetlands under WDOE (Hruby 2004). King County(2006a)requires a standard 75-foot-wide buffer for Category IlI wetlands that score less than 20 habitat points and are within the Urban Growth Area. Wetland C received a moderate water quality functions score, a low hydrologic functions score, and a moderate habitat functions score. T'herefore, it is our professional opinion I that Wetland C would be rated as a Category N wetland under WDOE (Hruby 2004). Within the Urban Growth Area, King County requires a standard 50-foot-wide buffer for ' Category IV ��vetlands. Wetland D also received a moderate quality functions score, a low hydrologic functions score, and a moderate habitat functions score. Therefore, it is our professional opinion that Wetland C would be rated as a Category N wetland under WDOE (Hruby 2004), and thus would require a standard 50-foot-wide buffer. The Delaney Park site is located within the King County UGA in a basin designated as "high" on the King County(2006b)Basin and Shoreline Conditions Map. However, the wetlands on the Delaney Park site do not meet the criteria for a`�vetland complex" as described in Section 21A.06.1392 of the King County(2006a) Critical Areas Code because the upland areas between Wetlands A,B, C and D aze mainly highly disturbed pasture or mowed lawn. Therefore,Wetlands A through D likely are not subject to additional buffer requirements as described in Section 21 A.24.325(D) of the King County (2006a) Critical Areas Code. �.2.2 �'�'ildlife King County identifies and protects critical wildlife habitat by protecting designated Wildlife Habitat Conservation Areas (King County 2004). A Wildlife Habitat Conservation Area is "an area for a species whose habitat the King County Comprehensive Plan requires the county to protect that includes an active breeding site and the area surrounding the breeding site that is necessary to protect breeding activit}�' (King County 2004). While the retention of laxge trees and snags (such as priority snags Delaney�Park Raedeke Associates, Inc. Wetland and ��'ildlife Assessment July 19, 2007 29 found on the Delaney Park property) is recommended for pileated woodpecker conservation in rural areas of King C�unty, the Delaney Park property is located within the Urban Growth Boundary. Therefore, no designated Wildlife Conservation Areas are present on the Delaney Park property. King County also protects critical wildlife habitat by designating and protecting an official wildlife habitat network system that"links wildlife habitat with critical areas, critical area buffers, priority habitats,trails,parks, open space and other areas to provide for wildlife movement and alleviate habitat frag�nentation" (King County 2004). Potential linkages are identified on the Wildlife Network and Public Ownership Map. Ivo wildlife habitat networks are mapped on or adjacent to the Delaney Park property(King County 2006b). Delaney Park Raedeke Associates, Inc. id%etla�zd and i�T ildlife Assessment July 19, 2007 —� 6.0 YROPOSED I�IPACT� Z'1115 Ci1SCUSSIOII Of pTO�eCt llllps�l� i� Oli-S1i� �0��.11dllti5 all�l DUIi�C� i� UdSc:U ull lllz J u1; `/.. 2007 site plan and May 24, 2007 preliminary grading and drainage plan prepared by CPI '. Consultants. The proposed development in�-olves construction of a 27-lot single-famih residential sul ' ' ' � ' 6.1 D��CT l��;;� �,: , � � 6.1.1 Wetland Impacf � The proposed development would not result in direct impacts to wetlands on the i Park site. A majority of the on-site portions of Wetlands A and B will be protected by a 75-foot-wide standard buffers as required by King County(2006a; Figure 9), with the exception of where the standard buffers extend onto adjoining properties to the west, which have been cleared and graded. A majority of the on-site portions of Wetlands and D will be protected by a 50-foot-wide standard buffer(Figure 9). Some indirect impacts to the wetlands, as discussed below, will likely result from the proposed proj`� 6.1.2 Wetland Buffer Impacts Portions of the standard buffers for Wetland C and Wetland D would be encroached upon by the proposed development. Clearing and grading will result in 1,634 square feet of direct impact to the buffers of Wetlands C and D (Figure 9). Encroachment into the 15- foot-wide building setback will result in 640 square feet of take of buffer around Wetland A. Approximately 6,700 square feet of buffer between Wetlands C and D will be temporarily disturbed in order to install water and sewer lines. Compensatory mitigation for these proposed buffer impacts is discussed in Section 7.2. C1.2 INDIRECT WETLA!�D IMPACTS 6.2.1 Overview Several environmental processes occur at a site-wide and watershed-wide scale that can indirectly affect the structural characteristics of a wetland, and thus affect—negatively or positively- the water quality, hydrologic, and habitat functions provided by a wetland (Stanley et al. 2005, Sheldon et al. 2005). Environmental processes include the delivery, movement, and loss of water, sediment, nutrients and toxicants through a site and watershed, as well as the size, spatial configuration, and connectivity of different habitats surrounding a wetland. The primary landscape characteristics that control water and sediment movement include climate, surficial geology, surrounding topography, soil characteristics, and vegetation (Stanley et al. 2005). Typically, areas with lower soil permeability provide lateral Delaney Park Raedeke Associates, Inc. YT stland and Wildlife Assessment July 19, 2007 31 subsurface flow of water, while areas with higher soil permeability allow for the vertical infiltration of water. Forested land provides the highest level of evapotranspiration and I groundwater rechazge, and the lowest level of interflow. Pastures and lawn provide high � levels of interflow, and low levels of evapotranspiration and groundwater recharge. The movement of nutrients and toxicants are contingent upon the characteristics above, as well as biotic cover and composition and manmade sources of pollution. Unless properly mitigated, the removal of forested and other vegetation, the removal and , compaction of topsoil,the construction of impervious surfaces, and alterations in overland flow drainage patterns may decrease groundwater recharge, reduce the downward movement of subsurface flow, and/or result in increased surface runoff flows (Stanley et al. 2005, Sheldon et al. 2005). Soil disturbance,vegetation removal, and runoff from streets, roads, and trails may also increase the delivery of sediments and pollutants to aquatic resources. Cumulatively, alterations to vegetation and soil may have , a wide range of impacts on the functions wetlands provide, and thus should be evaluated on a case-by-case basis. Many wildlife species in the Pacific Northwest use different types of habitat throughout their life cycle, and require a variety of habitat configurations and connectivity between ' habitats. Changes in land use have the potential to alter landscape-scale habitat associations and connectivity. A general discussion of how changes in landscape processes may impact the hydrologic, water quality and biologic functions of a wetland are discussed below; see Section 6.2.2 for a specific discussion of potential indirect impacts to retained wetlands on the project site. 6.2.2 Indirect Impacts to On-Site Wetlands The proposed development of the Delaney Park site would alter the existing conditions of portions of uplands on the site, and may result in indirect impacts to on-site wetlands. Following is a discussion of indirect impacts to the hydrologic, water quality, and biologic functions of�t'etlands A/B, C, and D. Hydrologic In:pacts The footprint of the proposed Delaney Park development would be located within a portion of the contributing basin of Wetlands A/B, C and D. Currently, the on-site contributing basin to the east of Wetlands A/B, C, and D consists mainly of heavily modified pasture, lawns and single-family residences. The existing pasture and lawns, as well as the soil composition of the site(Alderwood gravelly sandy loam), likely contribute substantial interflow that discharges to the west into the on-site wetlands. VVetlands C and D likel}� intercept a majority of the interflo«� from on-site uplands. Delanev Pm�k Raedeke Associates. Inc. !3�'etland and Yi'ildlife Assessmerzt July 19, 2007 32 However, hydrologic input also comes from surrounding uplands off-site to the south and west. Removal of existing vegetation and soil compaction would alter the timing and release of interflow that reaches the wetlands on the project site. CPH Consultants propose to route a majority of surface water runoff from impervious and less pervious surfaces to a stormwater vault in the south-central portion of the site (Figure 9). Stormwater from this vault would discharge into the east edge of the buffer of Wetland D. CPH Consultants also propose to maintain hydrologic input to the on-site wetlands by dispersing roof runoff from five of the houses near the east edge of the sensitive area tract, which consists of Wetlands A through D and their retained buffers (see CPH Consultant's [2007] preliminary grading and drainage plan). Roof runoff would be discharged via energy- dissipating dispersal trenches located along the north half of the east edge of the sensitive area tract. The stormwater and dispersal facilities would provide Leve12 flow control per the King County(2005) Surface Water Design Manual. Leve12 flow control are considered "Conservative Flow Control" and requires maintaining the durations of high flows at their pre-development levels for all flows greater than one-half of the 2-year up to the 50-year storm event under the existing conditions. Pre-development and post-development(vault-detained and rooftop dispersal) flow frequency and duration on the Delaney Park site was calculated using the King County Runoff Time Series (KCRTS). The KCRTS model calculated that peak discharge on the site during the 2-year storm event would be 0.5 cubic feet per second (cfs) after development, which matches peak discharge under existing conditions. Discharge rates during the five-year storm event would also be the same under pre-and post-development conditions (0.800 cfs). The proposed surface water detention and dispersal likely would result in minimal changes to the amount and timing of water that reaches Wetlands A/B through D. Thus, it is unlikely that there will be noticeable changes in each wetland's ability to detain floodwaters or perform water quality functions. Furthermore, it is anticipated that there would be minimal changes in the vegetation communities of on-site wetlands, particularly in Wetlands C and D,which are comprised mainly of weedy grass and herbaceous species. Erosion/Sedimentatio►i and Water Qualiry Impacts The Delaney Park development would include a temporary erosion and sediment control plan and other best management practices to attenuate water quality impacts from site development. The stormwater vault design will incorporate water quality measures as required in the King County(2005) Surface Water Design Manual. These practices would minimize loss of stormwater storage capacity and alterations in vegetation Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 33 communities and wildlife use that are commonly associated with increased input of sediment,nutrients, and toxicants into a wetland (Sheldon et al. 2005). �, Biologic Impacts �I The proposed development will encompass the majority of the site that is not contained ' within the retained wetlands and their associated buffers. This development would �I remove most of the pasture and grassland on the site, thus resulting in an unavoidable loss i of habitat for some types of wildlife. However, the on-site wetlands and a majority of the buffers, as well as the area between the buffers of A/B, C, and D, would be retained as open space, thus some habitat will remain available for a number of wildlife species. ' Removal of grazing and cessation of mowing in the wetlands and retained buffers would also allow vegetation to develop in the pastures, which would improve wildlife habitat over time. Save for the temporary disturbance associated with the installation of the sewer and water lines, there will be no disturbance to the connectivity of on-site wetlands and buffers. In addition, stormwater controls are expected to maintain surface water discharge flow rates at pre-development levels. Therefore, it is expected that there will be minimal changes to the wetlands' vegetative characteristics that support vvildlife habitat. Grading and construction activities associated with the proposed development, as well as increased levels of human activity on-site, would also result in increased short- and long- term disturbance to wildlife species using the retained habitat areas. This�rould further reduce the suitability of the on-site habitats to some wildlife species (Penland 1984). Some species adapted to urban environments and fringes, including many non-native plant and animal species,may find suitable habitat on-site and become established and/or increase in numbers. Those species less adapted for urban environments,however, would be expected to decrease in numbers. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 34 7.0 MITIGATION Mitigation has been defined by the SEPA (WAC 197-11-768; cf. Cooper 1987), and more recently in a Memorandum of Agreement between the Environmental Protection Agency and the COE (Anonymous 1989). In order of desirability, mitigation may include: 1. Avoidance - avoiding impacts by not taking action or parts of an action; 2. Minimization -minimizing impacts by limiting the degree or magnitude of the action and its implementation; 3. Compensatorv MitiQation -which may involve: a) repairing, rehabilitating, or restoring the affected environment; b) replacing or creating substitute resources or environments; c) mitigation banking. Development alternatives for the Delaney Park development could incorporate one or more mitigating measures that would avoid or reduce indirect impacts to on-site wetlands. 7.1 AVOID:�NCE Ai�D MInI1�1IZATION OF`��ETLAND IMPACTS King County's (2006a) Critical Areas Ordinance requires that de��elopment of the site avoid or minimize impacts to regulated critical areas (e.g.,wetlands) and attempt to limit impacts to these habitats by retaining them in open space tracts that include buffers. The proposed site plan for the Delaney Park project«�as designed to generally avoid or minimize impacts of the proposed development on wetlands and their buffers. The plan incorporates a number of elements that meet the definition of mitigation. 7.1.1 Avoidance of Impacts As noted previously, direct impacts (i.e., fill or excavation)to the on-site wetlands would not occur under the proposed site plan. Thus, 100% of the existing wetland acreage on the Delaney Park site would be retained under the proposed development. The proposed site plan will retain a majority of the on-site standard buffers on Wetlands A/B, C, and D. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 35 7.1.2 Minimization of Impacts The following design features applicable to the proposed site plan v�-ould minimize or limit direct and indirect impacts to the wetlands and their buffers: • Installing and maintaining temporary and permanent soil erosion control measures during and after construction, consistent with Best Management Practices, as required by King County, to limit the potential for sediment deposition or erosion in the retained wetlands and their buffers. • Routing stormwater runoff from the proposed development through stormwater detention and water quality facilities prior to discharge, to limit potential for sediment deposition and provide the required water quality treatment; where appropriate, discharge facilities would include energy dissipaters or flow dispersion facilities to prevent substantial erosion impacts. 7Z COMPENSATORY MITIGATION FOR BUFFER IMPACTS The proposed site plan for the Delaney Park development would result in impacts to portions of the standard buffers of Wetlands C and D. Below is a general discussion of characteristics that influence buffer functions,based on the research compiled in Sheldon et al. (2005), and an analysis of how the proposed buffer modifications and compensatory mitigation will affect buffer functions in Wetlands C and D. 7.2.1 Buffer Functions Wetland buffers protect and complement wetland functions by providing certain hydrologic and wildlife habitat functions. The potential of a wetland buffer to perform these functions depends on several structural and landscape characteristics of the buffer, which are discussed below. Water Quality Functions Typically wetland buffers do not substantially protect a wetland's abitlity to perfor. hydrologic functions such as flood storage or desynchronization; rather, stormwate� management and impervious surface control have a greater affect on the opportunit wetland to perform hydrologic functions (Dr. Tom Hruby, WDOE pers. conr- ' . ., .:. 2006). Wetland buffers do have the potential,however,to provide water quality functions sucl� as sediment removal, excess nutrient removal, toxicant removal and water temperature stabilization via micrcoclimate management (Sheldon et al. 2005). Sediment, toxicant , and nutrient removal generally require that surface and subsurface water flows are sufficiently slowed to allow particles to settle out of the «�ater column, and be irapped a1�d Deiarze,.Pm-k Raede�e Associates, Inc. Wetland and Wildlife Assessment Juiy 19, 2007 36 treated by plants and soils. Primary structural characteristics that influence a buffer's ability to perform these functions are low slope�adient, relatively high soil infiltration rate, and the presence of woody debris and vegetative obstructions on the buffer's ground surface. Additionally,toxicant removal requires vegetation and clay/hummus soils that can uptake and adsorb nutrients, respectively. Microclimate management in wetland buffers may promote more stable surface and subsurface water temperatures,which in turn may increase dissolved oxygen input and minimize nutrient loading in aquatic systems. The primary structural characteristic that influences stable water temperatures in wetlands and their buffers is the presence of a forest canopy to provide shade and block wind. A range of buffer widths may effectively perform these hydrologic functions. Effective buffer widths generally depend on a combination of structural characteristics of the buffer, its landscape position in the contributing watershed, the anticipated functions the buffer is to provide, and the intensity of surrounding land use. Wildlife Habitat Functions Wetland buffers can also support wildlife habitat by providing transition zones between aquatic and terrestrial habitats, screening wetland habitat from development disturbance, � and connecting isolated habitat areas. Structural characteristics important to these functions include presence of sufficient vegetation to generate woody debris and other organic matter,provide shelter and refuge, and screen wildlife from human disturbance. Based on the literature reviewed in Sheldon et al. (2005), wetland buffers comprised of native shrub and tree species seem to be most effective at protecting wetland habitat and providing upland habitat. Diversity in habitat types also creates more niches for wildlife species. Habitat connectivity generally is contingent upon external variables such as the landscape position of the wetland and v�Tetland buffer, and maintenance of habitat connectivity through landscape-scale planning and protection (Sheldon et al. 2005). As with hydrologic functions, a combination of several variables dictates effective buffer widths necessary to provide wildlife habitat functions. These include the structural features of the buffer,the life histories of target wildlife species, and the intensity of surrounding land use(Sheldon et al. 2005). 7.2.2 VVetlands C and D —Buffer Averaging Buffer averaging is proposed in order to allow the construction of one of the single-family residence lots and associated retaining wall in the west portion of the Delaney Park subdivision. Buffer width averaging also will be necessary for a recreation and stormwater tract within portions of the standard 50-foot-wide buffers of Wetland C and D (Figure 9). Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 37 Approximately 1,630 square feet of the east edge of buffer of Wetlands C and D would be eliminated (Figure 9). In order to accommodate encroachment into the 15-foot-wide building setback along the east edge of the Wetland C buffer, there would be an additiona1640 square feet of wetland buffer take. Lost wetland buffer would be replaced with approximately 2,300 square feet of wetland buffer along the west edges of Wetlands C and D (Figure 9). , The proposed buffer averaging will result in no net loss of buffer acreage for Wetlands C and D. The buffer take and the buffer give axeas lie on similar slope gradients upslope from Wetlands C and D. The proposed buffer take area consists of mowed lawn; none of the coniferous or deciduous trees within the buffer will be removed as a result of construction of residential lots or the recreation and stormwater tract. The vegetation in the proposed buffer give area is a combination of shrubland and mowed grasses. Since the buffer give area has comparable structural characteristics as the buffer area to be impacted, the proposed buffer averaging will likely result in no net loss of buffer function. 7.2.3 Wetlands C and D —Buffer Restoration The installation of water and sewer lines in a pre-existing City of Renton utility easement will result in approximately 6,700 square feet of temporary impacts to the buffer of Wetlands C and D (Figure 9). This portion of wetland buffer, which currently consists of mowed grassland and scattered deciduous and coniferous trees, will be revegetated with native woody vegetation after the water and sewer lines are installed. The proposed conceptual buffer restoration plan is discussed below. The proposed buffer restoration plan would restore as great or g-eater functions to portions of the buffers of Wetlands C and D that will be temporarily impacted by installation of sewer and water lines for the Delaney Park development. This goal will be accomplished through replanting the buffer surrounding the south portion of Wetland C and the north portion of Wetland D witl�native, shallow-rooted, shrubs. Species would be selected based on those native woody species currently found in uplands adjoining on- site wetlands, as well as those appropriate to hydrologic conditions provided and which are in compliance with applicable regulations regarding utility line construction and maintenance. The installation of shrub species would enhance the structural diversity and wildlife habitat value of the buffer area. Concurrent with the preparation of detailed engineering plans for final approval, full conceptual and final wetland mitigation plans would be developed based upon available site plan information. The conceptual wetland mitigation plan would present: (1) proposed design features and their locations, (2)mitigation goals and objectives, (3) monitoring plan outline, (4) evaluation criteria and performance standards, and (5) discussion of contingency plans and bonding. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July]9, 2007 � 38 � Upon approval of the conceptual wetland mitigation plan, a final planting plan and construction specifications would be prepared in conjunction with a landscape architect. The final planting plan would specify such items as: (1)plant species, quantities, and sizes, (2)planting locations, (3) general notes, (4)planting details, (5)construction timing, (6) protection of existing vegetation, (7) source of plant material, (8) soil amendments, (9)watering, and(10)maintenance. Specific plantings (consisting of native ; species, subject to availability} for the mitigation area would be developed in coordination with King County. The compensatory buffer restoration plans would include a systematic monitoring program to assess the success of the effort (Cooper 1987). The monitoring program would include construction, compliance, and long-term monitoring. The results of the monitoring would be used to develop any needed modifications or alterations of the mitigation site in subsequent years. The purposes of the monitoring program would be to: (1) document the physical and biological characteristics and wetland community development within the mitigation area; and (2) assure that the mitigation goals and objectives have been met and comply with pernut specifications. Performance standards of success (for use in monitoring), as well as contingency plans,would also be developed in coordination with King County. ; Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessrnent ,Iuty 19, 2007 39 8.0 LINIITATIONS We have prepazed this report for the exclusive use of Rick Burnstead Construction Co. and their consultants. No other person or agency may rely upon the information, analysis, or conclusions contained herein without permission from Rick Burnstead Construction Co. The determination of ecological system classifications, functions, values, and boundaries is an inexact science, and different individuals and agencies may reach different ' conclusions. With regard to wetlands, the final detemunation of their boundaries for regulatory purposes is the responsibility of the various agencies that regulate development activities in wetlands. We cannot guarantee the outcome of such determinations. Therefore, the conclusions of this report should be reviewed by the appropriate regulatory agencies. We warrant that the work performed conforms to standards generally accepted in our field, and was prepared substantially in accordance with then-current technical guidelines and criteria. The conclusions of this report represent the results of our analysis of the information provided by the project proponent and their consultants, together with information gathered in the course of the study. No other warranty, expressed or implied, is made. Delaney Park Raedeke Associates, Inc. t�'etland af�d [�i'ildlife Assessment .Iul}-19, 2007 40 9.0 LITERATURE CITED Anderson, J.R., E.E. Hardy, J.T Roach, and R.E. Witmer. 1976. A land use and land ' cover classification system for use with remote sensor data. U.S. Geological � Survey Professional Paper 964. 28 pp. Brown, H.A., R.B. Bury,D.M. Darda, L.V. Diller, C.R. Peterson, and R.M. Storm. 1995. �� Reptiles of Washington and Oregon. Seattle Audubon Society. Seattle, '�, Washington. 176 pp. Buol, S., D. Hole, and R. McCracken. 1980. 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Wahl, Bellingham, Washington. 139 pp. V�'ashington Department of Ecology. 1997. Washington state wetland identification and delineation manual. March 1997. Publication No. 96-94. 88 pp. plus appendices. Delane}�Park Raedeke Associates,Inc. Yi�etland and Wildlife Assessment July 19, 2007 �> �'�'ashin�ton Department of Fish and Vvildlife. 1999. Priority habitats and species list. Habitat Program. July 1999, Olympia, Washington. 32 pp. http:l/www.wdfw.v��a.gov/hab/phslist.htni. Virashington Department of Fish and��'ildlife. ?006. Priority Habitats and Species map I for To��nship �3 I�'orth, RanQe 5 East, Section 10. May 4, 2006. ,I V�'ashington State Department of I�atural Resources. 2006a. Forest Practices Base Ivlap �I for Township 23 North,Range 5 East, Section 10, W.M. I http://www3.wadnr.govldnrapp5/website/fpars.viewer.htm. November 28, 2006. , Washington State Department of Natural Resources. 2006b. Natural Heritage Information System search for Township 23 North, Range 5 East, Section 10. May 19, 2006. Washington State Department of Transportation. 2000. Wetland Functions Characterization Tool for Linear Projects. June 2�00. Washington State Forest Practices Board. 200�. Washington forest practices. Title 222 �T��AC, Forest Practices Board Manual; Chapter 222-16 WAC,Definitions. Department of Natural Resources, Forest Practices Division. Effective July 1, 2045. Wentworth, T. and G. Johnson. 1986. Use of vegetation in the designation of wetlands. Final report to USDI Fish and Wildlife Service. North Carolina Agricultural Service and N.C. State University, Raleigh. 107 pp. Delaney Park Raedeke Associates, Inc. I�'etland and Wildlife Assessment July 19, 2007 � W a � H � � � c.7 � , , . � , �, � .� � ; � _�, ..�_ _ _: __ �_____ _____ ,.� -� � �— -- ��__�,,._, �CA�ilAB,� h� � � � "UN1Tf0 STAT�S � � � ` -� � � � \ �eliin harr� ' � /San Juan Co. . 9 � \� {� e!1 ; .: , 3?�haico.n�o: � - - 'SkaqiY�a: ` d �� p � � O � Anac ries � � �� t.1 OfI�A I �JUAN 1SLAN05 � `\ � � \� <' : ' �sJand Co. . , : � . ' J' ' i \ _ _ �kagFi£o_ -_ _ � � 5nvhomish Ca. ' \ Fort ' Angeies � Port � � � � � ` -5 ` � ; ', ' ' '' ' / ' �I f�rett - � �� ' � i ` / �lallam�o. s :l Q4 \ -Jeffersan Co. --1 1 i � > � ; .Ed s : 2 �22 ' 3 � �4Ob _ �t�ltainish �o� - - /< thell lCing Co_ <' ; '' '< > . � _ _ i � � Redmond Jefferson�Co. " 0 31?ason Ga. Ki#sap Co. � � d �- / B vue o � J� �iremerton ts quat, � �� , Renton 202 'm � � 7 _ , � � j S/TE m , 3 ;� - <. �e� >�-s Y ' � ,;,� eder 3 c� - � A�bUrn `' 101 � m � !, ��; m ; ` ' I 164 ' 0 � ''� A ` s�,�� V�R�� y,'. �, o Puyatlup 4�0 ` m N � � .'�72 _�i__��_ �Ciny Q - - � . � r{ � ie��-�� Cv. Figure 1. Regional ma� showing general location of the project. � �� King County � � � iMAP 3 w 0.3(T D '1 � 2pl = � p3S8 0997 Ql91 ? t!3 � 835T 0353 O�DD 0188 0972 , ppg,p 935d �t t7111 Sr � ? 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Dala layers that appear on this map may or may not be accurate,current,or � SCele:1:24,000 otherwise reliable. THIS MAP IS NOT TO BE USED F�R NAVIOATION. Mep CBItt61':47°29'38"N,122°8�51��W Figure 3. U.S. Fish and Wildlite Natiunal Wetland Inventory (2UU6)map for the project area. � • � • � � � � • . . — . . �, : � �� k?+.9� ' r - sh , � ' 6� � % �� '" 8 j�'f�� p �n �' .� �'�.�� °�,!ti �, � ` r •in o�,a �, �''��,,�'� Trs,� � SF,t+RTH ST �''� y,,' � �" � �' b :��' � r o,p. � �w,s�,w ��"� ��y�'��'� : �,'w ��!. . a nt�y 1l ..n, ._. ..�,:� e�(1�'.1... �� ye'w'•"t ry �11hTM 3T d�"°�'�!rt!�" '�.'$r�u,r. ifl;� '114�Vi1 F� +��, �,�i +�, �,� 'i� F x �, �� .� ;d r �i, sr�� y : ^�+ ` ,a:. '� � �nt� � a� y �i.y; � �;' �� .o" , r'� .{r y,V�1�r ..F)� r� ti y�'.rr ''�'� +S"J,I •. Y .� : �, � ia � _y��$l /�... .. . ,� Aa g4�� , i, �' � � 2 : a.. 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' ','�'�-'�J � .a�ia.�'�ilra. .� _.�r� a�a:�if Le:�enc X � � ��.r Boundary .. � . � r -•i :� �o�!aJ's ISfI 1qh1� -�� , $L•varrs •�,:,��,,pp MAtlNo Nehnork � SAO NJeta��.1 � .� SAO Strearn :p�: Z �Jr�'.'�Y'<1 {"I:J:']: r_ Hqhway5 r ��-:a.t ` �/ i r_oroor�tod Aroa ^/ c s...:-..,_„� Y �ri S1'eet5 _.r.�...� .��7 �.�:.... . r.. c' .c �. c e infomiadon induded on this map has been compiled by King Counry staH from a variety of sources and is subject ro change without no0ce King County ; akes no represeMahons or wartandes,express or implied as to accurecy.completeneu,bmeliness a nghts to the use of wch Information King County all not be�iabk for arry 9enereL sp�clal.indirect,inadental,or conseQuenbal damages mGuding.but not limaed to.lost revenues ar bst profits result�rg from " he use or misuse of the information confained on this map My sale of this map or information on tliis map is prohibited except by written permission of King i� ounry. - ate.12-5-2006 Source.Ki Coun iMAP-Sensilive Areas htt ./lwww.metrokc. v/GIS/iMAP Figurc 7. 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I � I I , �a°��$�o? i �.��o, 5�� '�'Rc�L� �o'� �'� � .Et.�:;s�� l � ' �� o WETLAND D-PEM1 �70 �A��f P � pp� 8�0� \ 1 �, �R� Zp�� i ;� ' � 2,164 SF OnSite � ,7 � 7�0 P,�c$� � t i � �, ,;� d wetland coM�nues onsne, � � ��g�, E ma J o r l t y Is PFDt(Approx.loeatlon N l I „�'; - :',�' °1 bassd on vbual observatlonJ i �. u '. Q i v ... n ..,�:�� I�,rac+a.w.. . .� KEY ��x-.� f.:_. D �;�;Y�;-r�_��.,. ,. \ ' M.� n o r t h 3 = � � � PROJECT BOUNDARY � VEGETATION COVER TYPES � c� a �'�� ' „-�.�.,, :s ,ee � EXlSTING SURVEYED WETLANDS � GRAZED PASTURE � � """"�i j ��•��m , w � � RAI 4/25/06 ! ,�.x,>.:. ', �r.�° ° � � DECIDUOUS FOREST � � � — •.— KING COUNTY STANDARD BUFFER —JJ 'Z, m �m MOWED GRASSLAND RAEDEKE ASSOCIATES, INC. ° , EXISTING CONTOURS (Includes large trees) � '--`" 5711 NORTHEAST 63RD ST. SEA7TLE, WA 98115 N �sP-�a SAMPLE PLOTS (SURVEYED) � LOWU�ND SHRUB (zoe� s2s-e�sz FAX: (206) sse-2aao � d �sP-ia SAMPLE PLOT(APPROX. LOCATION) 0 URBAN � X PRtORITY SNAGS RAEDEKE ASSOCIATES PROJECT: 2006—�38-002 ' C (Approx. locations) DATE: 07/17/07 O E � DRAINN BY: ELP 0 0 � Base informotion provided by CPH Consultants: � files_ received 12-06-06, 06122-R14.dwg;received 07-09-07, CSIT110603_dwg ond CGRD110603.dWg � - FIGURE 9 RICK BURNSTEAD CONSTRUCTION CO. , � _ _ _ _ _ DELANEYPARK i — — — — _ _ KING COUNTY,WA i PROPOSED SITE PLAN I �LIMIT OF CLEARING i I � I � � � Wat�a�d CoMlnuea / � � Wettand Corklnus� 1 � `+.�OftSlta{Approx.fqc�fon I �� , '- �i � �� baasd on visual f � OffStte(Approx.loeatlon � � � � '�\ abnervatlodJ j �� I ,' based on vlauaF �l � �, � — I ■■ �■ ■ ■ — ■ _ ■ ■ — ■ _� obsarvatlon� 1 � , _y r � � � � .��-.'.'.� � i� r O1 '.'.';.'.'. . � — c ' ; r. 1` . . . :.:..:.�.: :.:.. ;� ` � - i i� � � -,i---�-3 i�—,� � '� ; .-• .s�s I / / •'•'\:�•.�.•.'.•.�. i' • � ��' l r. 6 I II �ir--- u � � ,] � I i I r;i , I I —�' � I � ■ - � .� WETLAND B - ' ( • �= ! � �� 'ii; ;f„ �i+� � �i ; ; � , I a i ■ �' ' � '� \�' . . . . . . . /��`.. � ,, i 4 �II , i( I� �i � li� jli i 'i�; ! I �� ' i � � „ , � '• :� 18,482SQ.FT ::�: { � `'� , �' s� :- �•,� � � I� ( ! � lil � i i i I i � I I a ' : ONSITE : '�� s''eu� ; �,�� ,� f� � �� '� ii v �ii � ij� � ��il � �� e �� ' I� � ��I B ! s �? < � s � z s i C � � `� . . . . _ .:::::,'.:-:... 1 1 � � ,., � �� I � � � �� j, ; J � � �I��' i • . . . . . . . . . ..4 � �� '� i �E i� ��i r ii! ,'i� � I�i i I i � � �� '�;�;�:•:•:•:,:.:t:.:.::::: , , . . . '� � �� I�� i , I�!I I� i�! �t ; I I I ; � - "'" � B �17�EAI�A '.'�'. \ S I �If; II �I � � ; I 3 � -:�:-�-:-:-;�:�:�:-:�:�' � ,�i � :�: WETLAND C .�.�. � �� . . � �i �� i � t� Ii I i� ,� � � i � I . � , � .•!-.•�.�.�.-.�.�.•.• � . .. i '�I��II/� �r I� ��I �� !�I I�� I� � I� � � + I y ,� � , •� � 15,066 SQ.FT i iii \ • � � �i��----f:�----��`� ii� !i i� i �!i: � + I i I � G c _ I;, , � ' . .y• .ON-SfTE � i� y�r �� , i -_.--_.ji ` � l_.�..� L-.-._-.- P.�' �1 �- ■ d , �:� , '� / . ��+ � � , � � � �I � I E ' � , � � �� '� i :�:r. euFre i�t r � ' i ! ; i i � � �� r � i I � ■10"CMP . . _ /J \ ��i� t t i � � t � i � � r c � � '" _� ��(approx. -: :;:•:�_: : � . ir _� � \ � N s � i�i � i ' I � _ + _ . + � � � a location • . :�.�.�-: . .-.�.�. •�:�:•:•:•:•:•. . �. • i ��, • ' ` �� - - � 1 :•. . . � ,I ;� ,��"i','� ,, a,��-----i i�-�----�,�-----=_, ` . r_ ' � � �, ,� �, � ' WETLANDA : .:.:5:.:.�'._ :: , I � � i , I I d�� ' � ."l � � � �:. � �,� i '� _;:,J,. . i �; '' � � ' I III �'I� li � i � f � v % ��:�:17,709 SQ,FT :::•:�: •:�:,` . � , j I I + ({ ��i�i i' �ir� � + �i � , �l , i i � i s s,-a� 3 ■ .f..�.:.'. . � . .�. .�. . . .�.�,�. . / . f � ;I �i1: t I� III � , I , ! I I' • I I I ,eD r� ,�.•.•.�.•.�.•.•.•.•.•.•.•.�. � 6, �� ' �I + It S7 i' i+` 1J II Lq �I I '��I I �I � � I' � � I i' � 7 I I�AJ10vMD yq �� 1/ I I� cv - - ■ � ,.i... . . . .�. . . . . . . . . . \ . I ��p. 8►pt111WTHt � I �L I 1��I ,1, � � Ilr n � I �y , li � � � � f I o . .4:.'i�'.� � � i�acr I ! I I ' I I' i ! � I O I - • • � 0� ' ' � I � ��' � �I � II� i ii ��II� �� I � il � i - � !��' ,�'►�r. '':. � 15' BSBL '; , lii � ��!; i ii ;i 4ii i� i i � � i; i i °° � . '� , �. �. _ : :,. . \ 4"�' 'ii� ' 'i ii i' � �'iI I�� !'� i ' F i i' i ' � � ( ' � ��' ■ �� ■ t� i�:-: . o� �ii, � ��i:� � � � � � ' � i �, I I I - 1 ■ ■ r ■ ■�.� ■ ■ � ■ ■ �:�:-: �•.�. . . i � I; Jr' , �I i t' R ii� i. i � � ' � � a _ � i r--- -----��. `l ,r; �t-� �' '��!"7'� i ��. ';' � 1�1 ' �. �II� I � � �� II � � I o ; 10"CMP ' � � .. Ewsr. ccr 4 � - - i � I--• II i� I� N � ( PPr ' i � - , 1 I I WETLAND D • � � a ox. OFF�SITE YMETLAND � �i ,,-= J ! � � a (Approx.Ixatlon based on �� EXi57.�PIIBL�C � Wetlahd Cortlnues ORSRa � � location) vi�usi oea�vanw,� , sEw�sesMr. J � � � �d�ox.rocanon�eaa,v� � � ' � Ex�sr. ause,c � � � � _ J ; � I � observatlon) i I � 5£MER fsuT I I I ' T EX/ST. PUBUC � � � £XIS7 PUBLIC � Wit1ER fSAfi. , . , WATFR£SMT. £JaST. LOT � £X�SL SEN9A4E Ea7S7. (0T I I I fX/5T. LOT � � ARE'A FACT � ��f � i I m d � + rn . % � ■ 1 � � ( + • north � I j � I I I � u �oo N 0 0 o so / " KEY �1 � 0 m � � ■ � PROJECT BOUNDARY -��-�� LIMIT O� CLEARING �� ` RAEDEKE ASSOCIATES, INC. o � EXISTING WETLANDS DELINEATED BY 0 BUFFER IMPACTS FROM CLEARING AND GRADING 5711 NORTHEAST 63RD ST. SEATTLE, WA 981 15 Q RAEDEKE ASSOCIATES, INC. 4/25/O6 (APPROX. 1,630 S� (zae� 525-8t22 FAX: (206} 526-2880 0 n q -�• -- � KING COUNTY STANDARD BUFFER � PAPER BUFFER TAKE TO ACCOMMODATE 15'BSBL v (APPROX. 640 S� RAEDEKE ASSOCIATES PROJECT:2006-038-002 � _ _,_ EXISTING CONTOURS r BUFFER RESTORATION E _ �____ PROPOSED GRADING (APPROX. 6,700 S� DATE: 07/17/07 ' DRAYVN BY; ELP a � BUILDING SETBACK L1NE (BSBL) � BUFFER GIVE ----'" � (APPROX. 2,300 SF) Base information provided by CPH Consultants: c�, _ _ __ _ ____ files. received 12-06-06, 06122�R14.dwg;received 0'7--d9-d'7, CSI�11b60�.dwg nnd CGRD110603.dWg 56 Table 1. List of aerial photob aphs used in the study. Agency Date Type 1 Scale V�'ash. Dept. Natural Resources (KP-70 series) 1970 B&W 1"= 1,000' Wash. Dept. Natural Resources (SP-81 series) 1981 B&W 1" = 1,000' `�4'ash. Dept. Natural Resources (SP-89 series) 1989 B&W 1"= 1,000' ��'ash. Dept. Natural Resources (NW-95 series) 1995 B&W 1"= 1,000' V�rash. Dept. Natural Resources (NW-01 series) 2001 Color 1"= 1,000' 1 B&W=black and white photograph Delaney Park Raedeke Associates, Inc. YY'etland and I�i'ildlife Assessment July 19, 2007 57 Table 2. Summary of definitions of water types found on Washington Department of Natural Resources Forest Practice Activity Maps (See Washington State Forest Practices Board [2005; WAC 222-16-030] for complete definitions). Type Definition (1) "Type S Water" means all waters,within theirbank-full width, as inventoried as "shorelines of the state"under chapter 90.58 RCW and the rules promulgated pursuant to chapter 90.58 RCW including periodically inundated areas of their associated wetlands. (2) "Type F`'�'ater"means segments of natural waters other than Type S Waters, which are within the bank-full widths of defined channels and periodically inundated areas of their associated wetlands, or within lakes,ponds, or impoundments having a surface area of 0.5 acre or greater at seasonal low water and which in any case contain fish habitat or are described by one of the following four categories: (a) Waters, which are diverted for domestic use by more than 10 residential or camping units or by a public accommodation facility licensed to serve more than 10 persons, where such diversion is determined by the department to be a valid appropriation of water and the only practical water source for such users. Such waters shall be considered to be Type F Water upstream from the point of such diversion for 1,500 feet or until the drainage area is reduced by 50 percent,whichever is less; (b) Waters,which are diverted for use by federal, state, tribal or private fish hatcheries. Such waters shall be considered Type F Water upstream from the point of diversion for 1,500 feet, including tributaries if highly significant for protection of downstream water quality. The department may allow additional harvest beyond the requirements of Type F Water designation provided the department determines after a landowner- requested on-site assessment by the department of fish and wildlife, department of ecology, the affected tribes and interested parties that: (i) The management practices proposed by the landowner will adequately protect water quality for the fish hatchery; and (ii) Such additional harvest meets the requirements of the water type designation that would apply in the absence of the hatchery; (c) Waters, which are within a federal, state, local, or private campground having more than 10 camping units: Provided, That the water shall not be considered to enter a campground until it reaches the boundary of the park lands available for public use and comes within 100 feet of a camping unit, trail or other park improvement; Delaney Park Raedeke Associates, Inc. Wetland and i�Y'ildlife Assessment July 19, 200' 58 Table 2. Continued. Type Definition (d) Riverine ponds,wall-based channels, and other channel features that are used by fish for off-channel habitat. These areas are critical to the maintenance of optimum survival of fish. This habitat shall be identified based on the following criteria: (i) The site must be connected to a fish habitat stream and accessible during some period of the year; and (ii) The off-channel water must be accessible to fish. (3) "Type Np Water"means all segments of natural waters within the bank-full v��idth of defined channels that are perennial non-fish habitat streams. Perennial streams are waters that do not go dry any time of a yeaz of normal rainfall. However, for the purpose of water typing, Type Np Waters include the intermittent dry portions of the perennial channel below the uppermost point of perennial flow. If the uppermost point of perennial flow cannot be identified with simple, non-technical observations (see board manual, section 23), then Type Np Waters begin at a point along the channel where the contributing basin area is: (a) At least 13 acres in the Western Washington coastal zone (which corresponds to the Sitka spruce zone defined in Franklin and Dyrness, 1973); (b) At least 52 acres in other locations in Western ��Vashington; (c)At least 300 acres in Eastern Washington. (4) "Type Ns Water"means all segments of natural waters within the bank-full width of the defined channels that are not Type S, F, or Np Waters. These are seasonal, non- fish habitat streaxns in which surface flow is not present for at least some portion of a year of normal rainfall and are not located downstream from any stream reach that is a Type Np Water. Ns Waters must be physically connected by an above-ground channel system to Type S,F, or Np Waters. (5) For purposes of this section: (a) "Residential unit"means a home, apartment, residential condominium unit or mobile home, serving as the principal place of residence. (b) "Camping unit"means an area intended and used for: (i) Overnight camping or picnicking by the public containing at least a fireplace,picnic table and access to water and sanitary facilities; or (ii) A permanent home or condominium unit or mobile home not qualifying as a"residential unit"because of part time occupancy. Delaney Park Raedeke Associates, Inc. I Wetland and Wildlife Assessment July 19, 2007 !i 59 Table 2. Continued. T}�pe Definition (c) "Public accommodation facilit�'means a business establishment open to and licensed to serve the public, such as a restaurant, tavern, motel or hotel. (d) "Natural waters" only excludes water conveyance systems which are artificially constructed and actively maintained for irrigation. (e) "Seasonal low flow"and "seasonal low water"mean the conditions of the 7-day, 2-year low water situation, as measured or estimated by accepted hydrologic techniques recognized by the department. (fl "Channel width and gradient"means a measurement over a representative section of at least SOO linear feet with at least 10 evenly spaced measurement points along the normal stream channel but excluding unusually wide areas of negligible gradient such as marshy or swampy areas,beaver ponds and impoundments. Channel gradient may be determined utilizing stream profiles plotted from United States geological survey topographic maps (see board manual section 23). (g) "Intermittent streams"means those segments of streams that normally go dry. (h) "Fish habitat"means habitat which is used by any fish at any life stage at any time of the year, including potential habitat likely to be used by fish which could be recovered by restoration or management and includes off-channel habitat. Delaney Park Raedeke Associates, Inc. Wetland and Wildlife Assessment July 19, 2007 60 TaUle 3. Probable ratings and buffers of wetlands on thc Dclancy Park property based on the VVI)OE (Hruby 2004) raling system and the current King County(2006a) Critical Arcas Ordinance. King County I�' On-sitc WDOE WDOE (2006a) Area Cowardin Veg. WDOE Total Habitat Standard Wctlaud/unit (acres) Classl HGM ClassZ Category3 Score Score Buffer A/B� A= 0.41 PSS 1 (on-site) Depressional III 44 18 75 I3 = 0.42 (Slope) C 0.35 PEM l, PSS l Depressional N 27 14 50 (Slope) D 0.05 PEMI (on-site) Depressional IV 28 12 50 � Vegetation classes based on Cowardin et al. (1992). See rating fonns for additional vegetation classes. ' Denotes Hydrogeomorphic (HGM) class used for rating purposes, as defined in Hruby(2004). Additional HGM class for a portion of the wetland assessment unit is shown in parentheses. j I2ating based on WDOE rating system (Hruby 2004). 4 Wetland continues off-site Delanc.y Purk Ruedeke Associates, hic. Weticind und Wildlife�lssessment July 19, 2007 61 Table 4. Wildlife species detected on the Delaney Park property during the October 19, 2006 wildlife reconnaissance or otherwise mentioned in report text. "(n" indicates introduced species, "*" denotes species detected by sign only. Common Name Scientific Name Detected Al�7PHIBIANS Pacific treefrog Hyla regilla X REPTILES Garter snake Thamnophis spp. BIRDS House finch Carpodacus mexicanus X American robin Turdus migratorius X American goldfinch Carduelis tristis X House sparrow Passer domesticus X Bewick's wren Thryomanes bewickii X Glaucous-winged gull Larus glaucescens X Northern flicker Colaptes auratus X Downy woodpecker Picoides pubescens Pileated woodpecker* Dryocopus pileatus X Steller's jay Cyanocitta stelleri X Black-capped chickadee Poecile atricapillus X Bushtit Psaltriparus minimus X Chestnut-backed chickadee Poecile rufescens X Brown creeper Certhia americana X Ruby-crowned kinglet Regulus calendula X Golden-crowned kinglet Regulus satrapa X Spotted towhee Pipilo erythroplzthalmus X MAI1'IMALS Common opossum (� Didelphis vifginiana Eastern gray Squirrel (I) Sciurus carolinensis Norway rat (n Rattus nos-�egicus Black rat (I) Rattus rattus House mouse (1� Mus musculus Black bear Ursus americanus Raccoon Procyon lotor Domestic dog (� Canis familiaris Coyote Canis latrans Domestic cat (� Felis sylvestris Bobcat Lynx rufus Black-tailed deer Odocoileus hen�ionus Delaney Park Raedeke Associates, Inc. ��etland azzd T�Jildlife Assessment Julv 19, 2007 62 Table 5. Functions and values for wetlands located within the Delaney Park site,based on the WSDOT(2000) Wetland Functions Characterization Tool for Linear Projects. See Appendix C for data forms. Hydrologic Functions �'etlands VVetland Wetland A/B C D Flood Flow Alteration YES NO YES Sediment Removal YES NO YES Nutrient and Toxicant Removal YES NO YES Erosion Control and Shoreline Stabilization NO NO NO Wetland Wetland Biological Functions Wetland A C D Production of Organic Matter and Its Export YES N/D NO General Habitat and its Suitability YES YES YES Habitat for Aquatic Invertebrates YES NO NO Habitat for Amphibians YES NO NO Habitat for Wetland Associated Mammals NO NO NO Habitat for Wetland Associated Birds YES NO NO General Fish Habitat NO NO NO Native Plant Richness YES I�TO YES Wetland �'4'etland Social Values V�'etland A C D Educational or Scientific Value NO NO NO Uniqueness and Heritage NO NO NO Delaney Park Raedeke Associates, Inc. ii'etlan�l and Wildlife Assessrnent July 19, 1007 � � � � �, A ° z o w � a.a � � � � A-2 I A.1 Plant Community Description and Classification Methods Qualitative and quantitative indicators are used to determine whether hydrophytic vegetation is present on a particular site. Each of the plant communities on the property are classified according to the predominant vegetative growth form, and in some cases, substrate material, flooding regime, and/or land use. Wetland communities are classified according to Cowardin et al. (1992), while upland communities are classified according to Anderson et al. (1976). The Corps of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987) defines hydrophytic vegetation as"the sum total of macrophytic plant life that occurs in areas where the frequency and duration of inundation or soil saturation produce permanently or periodically saturated soils of sufficient duration to exert a controlling influence on the plant species present"(Environmental Laboratory 1987:16). , Specifically, "hydrophytic vegeta.tion is prevalent in an area when the dominant species comprising the plant community or communities are typically adapted for life in saturated soil conditions" (Environmental Laboratory 1987:17). . Hydrophytic vegetation is present when"more than 50% of the dominant species are OBL, FACW, or FAC [as defined below] on lists of plants species that occur in v��etlands" (Environmental Laboratory 1987:19). Other indicators of hydrophytic vegetation include visual observation of plant species growing in areas of prolonged inundation and/or soil saturation,morphological adaptations of vegetation, technical literature, physiological and reproductive vegetation adaptations. In order to determine the dominant vegetation in an area, vegetation communities are described and classified using the Braun-Blanquet cover-abundance "plotless" sampling methodology as outlined in Mueller-Dombois and Ellenberg (1974; Table A.1). According to this methodology, a vegetated area is divided into one or more homogeneous cover types. For each cover type,plant species composition and cover are recorded based on"plotless" sampling. Table A.1 contains a key to the Braun-Blanquet cover scale. Scientific and common nomenclature of vegetation follows Hitchcock and Cronquist (1976), as updated by Pojar and MacKinnon (1994) and Hickman(1993). Each species within the cover type is assigned a wetland indicator status (WIS)rating as established by Reed(1988, 1993). Wetland indicator status ratings were developed in order to segregate species into "ecological groups." Each group contains species with similar probabilities of occurrence in wetlands or similar abilities to withstand saturated soil conditions. Plants are rated, from highest to lowest probability of occurrence in wetlands, as obligate(OBL), facultative wetland(FACV�, facultative (FAC), facultative upland (FAC�, and upland (UPL). Table A.2 contains a detailed key to the wetland indicator status categories. Plant species not listed in Reed (1988, 1993) are rated upland by default (Federal Interagency Committee for Wetland Delineation 1989). A-3 Two quantitative indices are used to analyze vegetation data in order to determine if the plant community meets the definition of"hydrophytic vegetation." The first index represents the percentage of dominant species with a WIS rating of facultative or wetter. A species with a cover class value of 2 (5% - 25%canopy cover) or greater on the Braun- Blanquet scale is considered a dominant. The second vegetation index is a weighted mean of the WIS ratings. This weighted mean index (V�MI) calculates the average WIS rating of all species in the plot by weighting each species based upon its relative cover. The WMI is a measure of the plant community's adaptation to saturated soil conditions (Wentworth and Johnson 1986). The WMI provides an objective parameter for determining whether a plant community is indicative of wetland or upland conditions. Ideally, the "breakpoint"between wetland and upland vegetation is a weighted mean index of 3.0, with wetland vegetation characteristics indicated by a WMI less than 3.0 and upland vegetation characteristics indicated by a WMI greater than 3.0. When the weighted mean index is near 3.0, however, vegetation may not clearly indicate whether an area is wetland or upland. In such cases, soil and hydrologic conditions must be carefully considered. As the weighted mean index of a plant community or plot approaches either extreme on the scale (i.e. approaching 1 or 5),however, the probability of the vegetation indicating either wetland or upland increases (see Figure A.1). Wentworth and Johnson(1986) confirmed the effectiveness of this methodology for a wide variety of plant communities in different regions of the United States. The following example illustrates the calculation of the two indices. Table A.3 contains an example of a calculation in the format contained within the text of Exhibit B of our report. l. Calculation of the percent of the dominant species that are rated facultative (FAC) or wetter: % FAC or wetter species=y/x * 100 Where, x =the total number of dominant species. Dominant species are defined as species with a cover class of 2 or greater according to the Braun- Blanquet methodology. y=the number of dominant species that have WIS ratings of FAC or wetter. 2. Calculation of the��eighted mean index (WMI): A-4 For the calculation of the WMI, each Braun-Blanquet cover value is converted to the mid-point of the cover class, and the WZS ratings are converted to numerical values. The calculation is done according to the following formula: WMI= sum of(CCM * WIS) sum of(CCM) where, CCM=percent cover class midpoint for each species, WIS =wetland indicator status rating for each species. The 1987 manual requires only an analysis of vegetation dominance. If the proportion of dominant plant species rated FAC or wetter is greater than SO%, the vegetation community is considered hydrophytic. Although a WMI is calculated for each vegetation community in this report, the determination of the presence of hydrophytic vegetation according to the 1987 methodology is based solely on vegetation dominance value5. A.2 Soil Description and Classification Methods Hydric soils are classified by examining soil morphology. Soils are described by using exposed profiles within pits or by examining soils obtained from boreholes. Other observations such as topography and degree of disturbance (i.e. filling and/or grading) are also recorded. In order to determine the variation and distribution of soils,boreholes are dug throughout the property. In addition to the field investigation, U.S. Soil Conservation Service Soil Survey reports and maps are examined to determine the soil mapping unit(s) for the property. Soil color is based on three spectral variables: hue(the dominant spectral color), value (the relative brightness of color) and chroma(the purity of color) (Buol et al. 1980). Alphanumeric values are assigned to these spectral variables using the notation of the EarthGolors soil chart (Munsell Color 2000). Soils are examined for hydric soil characteristics within the upper 20 inches of the profile. According to the 1987 manual, soils are specifically examined for hydric indicators immediately below the A horizon or 10 inches,��vhichever is shallower. Hydric soil indicators include, but axe not limited to, 1) gley conditions, 2)mottling in a low chroma matrix, 3)histic soils, and 4) saturated or inundated conditions. Gley conditions are the presence of gray, greenish gray, or bluish colors in the soil. Gley conditions indicate that iron in the soil has been leached or occurs only in reduced form because soil conditions have been anaerobic for a considerable amount of time. A-5 Mottling in a low chroma matrix is the occurrence of"spots" of contrasting soil colors within the soil matrix. Low chroma is defined as having a chroma less than or equal to 2, according to standard Munsell notation, and indicates colors of low purity(i.e. gray colors). The presence of mottles in a low chroma matrix indicates alternating oxidized and reduced conditions as occurs with fluctuating saturated and unsaturated soil conditions. A histic soil is a soil primarily composed of organic material. In most cases, organic soils axe indicators of very poorly to poorly drained conditions. Histic soils typically develop on sites with nearly constant saturation because under such anaerobic conditions plant materials decay slowly. Saturated or inundated soil conditions are often indicators of hydric soils; however, recent weather conditions must be taken into account. Intense rates of precipitation or constant precipitation over a period of time can produce saturated or inundated conditions in an otherwise non-hydric soil. While hydric soil morphology can be an indicator of wetland soil, it may not define an area as wetland. Artificially drained hydric soils may exhibit hydric morphology,but no longer be flooded or saturated for sufficient time to favor the growth and regeneration of hydrophytic vegetation. Therefore,these areas would no longer be classified as wetland (Cowardin et al. 1992; Environmental Laboratory 1987). Conversely, a soil may be subjected to saturated or flooded conditions for a sufficient period of time to favor the growth of hydrophytic vegetation, yet lack"typical"hydric soil morphology. This phenomena occurs commonly in young or poorly developed soils. Examples of soils lacking hydric morphology,yet meeting the hydric soil definition, include poorly drained recent deposits such as sand bars,poorly drained minesoils, or other recently disturbed soils. Certain soil materials can also "mask"the usual morphological indicators of poorly drained conditions. Soil morphology is an indicator of environmental conditions under which the soil developed; however, its morphology may not reflect present environmental conditions. Careful observation of soil morphology in association with vegetation,topography, and hydrology is needed especially when soils are young or disturbed. A.3 Characterization of Hydrology The importance of water to the existence of wetlands is clearly stated in the Corps of Engineers (COE) definition of wetlands as: those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions (Federal Register 1986:41251). A-6 , Wetland hydrology, the primary determinant for the development of hydric soils and � hydrophytic vegetation, is the most critical factor for wetland formation. Without wetland hydrology an area cannot be classified as a wetland. "Wetland hydrology" describes the hydrological characteristics of areas that are periodically inundated, or have soils saturated to the surface at some time during the growing season of the prevalent vegetation (Environmental Laboratory 1987). Topography and soil properties are the primary factors controlling local hydrology. Wetland hydrology exists because 1)topography directs water towards or impedes water flow out of an area, 2) soil conditions restrict drainage, or 3)both topographic and soil conditions favor wetland hydrology. Therefore, observations of topography and soil properties are a necessary part of any wetland determination. Indicators of wetland hydrology include both recorded and field data. Recorded data typically include stream, lake, and tidal gage records of the COE,U.S. Geological Survey (IJSGS), state, county, and/or local governments. Field data typically include visual observations of inundation, soil saturation, watermarks, driftlines, sediment deposits, and drainage patterns (Environmental Laboratory 1987). ' In order for an area to have�vetland hydrology according to the 1987 manual, soils must be saturated within a major portion of the��egetation rooting zone (usually within 12 inches of the surface) for at least 5% of the growing season(LJ.S. Army Corps of Engineers 1991b, 1992; see Table A.4). The growing season is defined as "the portion of the year when soil temperatures are above biological zero (41 degrees F). In the absence of soil temperature data, growing season length is estimated from climatological data provided by most U.S.D.A. Soil Conservation Service county soil surveys. Growing season starting and ending dates are deternuned based on the"28 de�ee F or lower" air temperature threshold at a 50 percent annual (i.e. "5 years in 10") frequency(U.S. Army Corps of Engineers 1992). For example, based on the criteria stated above,the growing season as recorded at Seattle-Tacoma Airport, King County, Washington begins on February 7 and ends on December 8 (NRCS National Weather and Climate Center 2006). Thus, the growing season is 304 days long. Five percent of the growing season (253 days) is 152 days. Therefore, soils at locations near Seattle-Tacoma Airport must be saturated in the major portion of the vegetation rooting zone for 15.2 consecutive days between February 7 and December 8 in order to exhibit wetland hydrology according to the 1987 manual. Since the climate in this region is generally cool and wet in the«inter and warm and dry in the summer, soils are generally wettest(and therefore most likely to meet the wetland hydrology criteria) during the 15-day period at the beginning of the growing season. Inundation or soil saturation is the most direct evidence of wetland hydrology; however, these obsen�ations must be considered in context with prevailing weather conditions. Saturation does not necessarily indicate wetland hydrology because even a well-drained soil may have ponded or saturated conditions when the rate of precipitation exceeds the A-7 infiltration rate of water in the soiL In most cases,however, saturated soil conditions associated with hydric soil morphology form a reasonable indicator of wetland hydrology. Because of the seasonal nature of precipitation in the Pacific Northwest,positive indicators of wetland hydrology(i.e. saturation)may not be present during all seasons of the year. In addition, the hydrology of many wetland systems has been altered through agricultural and construction practices such as ditching, diking, groundwater withdrawal, surface water diversion, excavation,placement of fill material, soil compaction, and removal of vegetation. These activities can make the evaluation of wetland hydrology difficult, and may require the use of more intensive field evaluation techniques. A.3.1 Field Techniques for Evaluating Wetland Hydrology Appropriate field techniques for wetland hydrology investigation may include detailed soil investigation and mapping to establish the presence of hydric soil morphology, and implementation of groundv��ater monitoring to detemune the extent and duration of soil saturation. In order to establish whether or not an area meets the federal wetland hydrology criteria, direct observation of wetland hydrology must be made in the field. These direct observations must be performed during the growing season vc�ith sufficient frequency to verify the duration of the hydrologic condition. Further, observations of wetland hydrology must be spatially distributed to adequately represent the area in question. Because soil saturation is a critical factor in wetland determination, it may be necessary to establish a series of monitoring points over a given area to measure the degree and duration of soil saturation. One method for performing this task is the implementation of detailed groundwater monitoring using a combination of groundwater observation wells, boreholes, and soil pits in conjunction with additional site-specific geologic, climatic, and hydrologic information. Measurement of a shallow water table may be done by excavating a soil pit or borehole in the soil pr�file and observing the depth at which the soil is saturated. Water table elevation data may also be obtained through the use of observation wells. When placed at variable elevations on the site, shallow groundwater monitoring wells allow measurement of water table levels over time. Observation wells have an advantage over soil pits or boreholes in that the wells are sealed from direct contact with precipitation arid allow measurement of water table elevations during periods of heavy precipitation. A.3.1.1 Soil Pit Methodology Soil pits are used to examine the morphology of the soil profile at a given location to ; establish the depth of the water table below the ground surface. Soil pits are excavated I with a six-inch wide trenching spade to a depth of at least 20 inches below the ground j surface. After excavation, one side of the soil pit is scraped so that fine soil is not I smeared across pore openings. Observations of soil morphology, color and texture are A-8 made. Observations of water table depth below the ground surface and seepage from the soil pit wall are recorded after a period of time depending on soil texture. A.4 Overview of 1987 Manual The Corps of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987) was originally developed as a set of guidelines for wetland determination rather than as explicit criteria. Nonetheless, all three parameters(i.e. hydric soil, hydrophytic vegetation, and wetland hydrology)must exist for an axea to be classified as wetland. The manual "stresses the need to use sound professional judgment,providing latitude to demonstrate whether an area is a wetland or not based on a holistic and careful consideration of evidence for all three parameters"(U.S. Army Corps of Engineers 1991b:1). According to the 1987 manual,hydroph}rtic vegetation cannot be inferred from hydric soils or wetland hydrology, except as detailed in the Atypical Situations and Problem Areas sections of the manual (Environmental Laboratory 1987). Hydric soils, however, can be inferred from hydrophytic vegetation given that the vegetation is dominated by obligate wetland plants, or the vegetation is dominated by facultative or wetter wetland plants and the wetland boundary(i.e. the wetland/upland interface) is abrupt. A-9 Ranee of VJeighted A�erage Scores � � extreme wetland �y'edand <---------^-------> Upland extreme upland (100°�b obligate hydrophytes) ^ (100%obligate upland species) � . ^ . 1.0 l.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 ;------------I---------i-----------�-------�-_--------�-------I-------I ----I <----------I-------->. . ^ . <-------�---------->. . � . . ^ . . � . Hieh probabi]ity site is wetland ^ High probabiliry site is upland � . <------->• ^ •<---->• . . � � � Good probabi]it}�that site is H-edand; ^ Good probability that site is an upland; additional data regardine soils and;'or ^ additional data regazding soils and/or hydroloe}•are desirable. ^ hydrology are desirable. � ��--------------------->. � • �'eeetation dzta alor.e are inadequate for designarion of site; additional data regarding soils and/or hydroloey are required. Figure A.1. Weighted Mean Index (WMI) Scale (Wentworth and Johnson 1986). A-10 Table A.1. Key to Braun-Blanquet cover-abundance scale. Braun- Blanquet Cover Class Cover Class Code Definition Range (%) Mid-Point (%) 5 Any number, with cover 75-100 87.5 more than 3/4 of the reference area 4 Any number, with cover 50-75 62.5 between 1/2 and 3/4 of the reference area 3 Any number,with cover 25-50 37.5 between 1/4 and 1/2 of the reference area 2 Any number, with cover 5-25 15.0 between 1/20 and 1/4 of the reference area 1 Numeraus,but less than < 5 2.5 1/20 cover, or scattered, with cover up ta 1/20 + Few,with little cover <5 2.5 r Solitary,with little cover <5 2.5 A-11 Table A.2. Key to United States Fish and Wildlife Service ��'etland Indicator Status (WIS) categories and equivalent numeric values. Indicator Indicator Numeric Category Symbol Value Definition Obligate OBL 1.00 Plants that occur almost always Wetland (estimated probability>99%) Plants in wetlands under natural conditions,but which may also occur rarely(est. probability <1%) in non-wetlands. - FACW+ 1.67 See footnote 1 Facultative FACW 2.00 Plants that occur usually Wetland (est.probability>67% - 99%) Plants in wetlands,but also occur (est. probability 1% - 33%) in non-«-etlands. - FACW- 2.33 See footnote 1 - FAC� 2.67 See footnote 1 Facultative FAC 3.00 Plants with a similar like- Plants lihood (est. probability 33% - 67%) of occurring in both wetlands and non-wetlands. - FAC- 3.33 See footnote 1 - FACti+ 3.67 See footnote 1 Facultative FACU 4.00 Plants that occur sometimes Upland (est. probability 1% - <33%) in Plants wetlands,but occur more often (est. probability>67% - 99%) in non-wetlands. - FACU- 4.33 See footnote 1 A-12 Table A.2. (Continued.) Obligate UPL 5.00 Plants that occur rarely(est. Upland probability<1%) in wetlands, Plants but occur almost always{est. probability>99%) in non-wetlands under natural conditions. Obligate UPL* 5.00 Not listed by Reed(1988, 1993), and Upland therefore presumed to be an Plants by obligate upland plant. Default 1 Species with a"+" after the rating are considered wetter(i.e., have a greater estimated probability of occurring in wetlands) than respective species without a plus rating, while species with a"-" are considered drier(i.e., have a lower estimated probability of occurring in wetlands)than respective species without a minus rating (Environmental Laboratory 1987:18-19). A-13 Table A.3. Example calculation of vegetation indices. B-B Cover Product of Scientific WIS WIS Cover Class Midpoint and Name Symbol Value Value Midpoint WIS Value Juncus effusus FACW+ 1.67 4 62.5 104.4 Ranunculus repens FACW 2.00 2 15.0 30.0 Phalaris arundinacea FACW 2.00 1 2.5 5.0 Holcus lanatus FAC 3.00 1 2.5 7.5 Dactylis glomerata FACU 4.00 1 2.5 10.0 Lolium perenne FACU 4.00 - 2.5 10.0 Juncus spp. FAC-OBL 2.00 - 2.5 5.0 TOTALS 90.0 171.9 WMI= 171.9/90.0= 1.91 Percent of the dominant species rated FAC or wetter=2/2*100 = 100% A-14 Table A.4. Hydrologic zones in nontidal areas (Environmental Laboratory 1987). Zonei Name Duration2 Comments I Permanently inundated 100% Inundation>6.6 feet mean water depth II Semipertnanently to >75% - <100% Inundation defined as £6.6 ft nearly permanently mean water depth inundated or saturated III Regularly inundated or >25°% - 75% saturated N Seasonally inundated or >12.�°'0 - 25% saturated V Irregularly inundated or >j°�o - 12.�% Many areas having these hydrolo�ic saturated characteristics are not uretlands VI Intermittently or never <�% Areas with these hydrologic saturated characteristics are not wetlands 1 This defines an aquatic habitat zone. 2 Refers to duration of inundation and/or soil saturation during the growing season. APPENDIX B Field Survey Data i I I 1 I APPENDIX B Field Survey Data B-2 Table B-1. Scientific and common names of plants with assigned Wetland Indicator Status (WIS) (Reed 1988, 1993). Scientific names from USDA NRCS (2007). Scientific Namel Common Name WIS2 TREES Alnus rubra Red alder FAC Populus balsarrcifera ssp. trichocarpa Black cottonwood FAC Thuja plicata Western red cedar FAC SHRUBS Alnus rubra (s) Red alder FAC Lonicera involucrata Twinberry honeysuckle FAC+ Populus balsamifera ssp. trichocarpa (s) Black cottonwood FAC Rubus laciniatus Cutleaf blackberry FACU+ Rubus spectabilis Salmonberry FAC+ Spiraea douglasii Rose spirea FACW HERBS/FERI�TS Agrostis spp. Bentgrass FACW/FAC� Athyrium filix femina Common ladyfern FAC Bryophytes# Undifferentiated mosses -- , Galium trifidium Threepetal bedstraw FACW+ Geum macrophyllum Largeleaf avens FACW- Glycena striata Fowl mannagrass FACW+ Gramineae# Undifferentiated grasses -- , Holcus lanatus Common velvetgrass FAC ', Hypochaeris radicata Hairy catsear FACU ! Juncus effusus Common rush FACW � Juncus spp. Rush FACW� Leucanthemum vulgare Oxeye daisy UPL@ Mentha spp. Mint FACW� Phalaris a�-undinacea Reed canarygrass FACW Poa spp.# Bluegrass -- Table B.1. Continued. B-3 Scienti�c Name� Common Name VVIS2 Polygonum spp.# Knotweed -- Ranunculus repens Creeping buttercup FACW Rumex acetosella Common sheep sorrel FACU+ Rumex crispus Curly dock FAC+ Taraxacum officinale Common dandelion FACU Tellima grandiflora Bigflower tellima UPLC Trifolium repens White clover FAC VeYonica scutellata Skullcap speedwell OBL Notes: 1 =The follo��ving codes are used: (s) = Sapling O = Genera with species having a narrow range of WIS ratings that were averaged and were then included in our vegetation plot calculations. � = Genera with species having a wide range of WIS ratings, not included in our ��egetation plot calculations. � = Those species not listed by Reed (1988, 1993) are rated UPL@ by default(Federal Interagency Committee for Wetland Delineation 1989). These species were included in our vegetation plot calculations. IVI=No indicator. Species not reviewed by Reed(1988, 1993) due to lack of information on r��hich to base an indicator status. These species were not included in our vegetation plot calculations. § =Federally listed as endangered, threatened, or sensitive 2 =WIS ratings with a minus symbol are considered "drier", while the plus symbol indicates "wetter" species. Plants not idenrified to species are shown with the WIS range for the species common to this region. Table B.2 Delaney Park Wetland and Wildlife Assessment. Sample Plot 2, located west of Flag A-7, in eastern portion of Wetland A. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Shrubs and Saplings i Herbs Holcus lanatus 2 15.0 3.0 45.0 Mentha spp. 1 2.5 2.0 5.0 Trifolium repens 1 2.5 3.0 7.5 Juncus effusus + 2.5 2.0 5.0 Hypochaeris radicata + 2.5 4.0 10.0 Musci 3 0.0 0.0 0.0 Poa spp. 5 I SUMS 25.0 72.5 Weighted Mean Index: 2.90 ..................................... Hydrophytic % of dominant species with a WIS vegetation: Yes index of 3.0 or less: 1.Q�.:.R.Q.................................................. Veg Notes ................................................................................................................. ............................................................................... ................................................................................................................................................................................................ Wildlife � ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ................................�---.............._..........................- ��--�--��--�--...._...........----......................--�-�---�-----.....................--- Field Date: 4/25/06 RAI Observers: MM RAI Project#: 2006-038-002 Table B.2 Continued. SOIL Soil pit number SP2 .. Field observations confirm mapped type? ❑Yes {� No ............................................ Map Unit(Series/Phase) Alderwood..gravelly.sandy.loam,........,_.. On hydric list? ❑Yes �No Map Symbol A9.B...................................... .............................................. Hydric inclusion? ❑Yes ❑ No Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-9" black (10YR 2/1) (no texture) i 9-15+^ very dark grayish brown many,fine, distinct dark brown-brown (no texture) {10YR 3/2) (7.5YR 4/4) � Soil Profile ............................................................................................................................................................................................... Notes: ..................................................................................... .......................................................................................................... Hydric Soil Indicators(check): ❑ Histosol �;Aquic Moisture Regime ❑Concretions [ Histic Epipedon ❑Reducing Conditions _High Organic Surface (sandy soils} C Sulfidic Odor �Gley/Low Chroma �Organic Streaking (sandy soils) Hydric Soil Criteria Met? B Yes ❑No Rationale Soils.immediately.below_the'A' horizon have a matrix chroma of 2 with redoximorphic...,.... ......................................................................................................................... f.s.a�ur.�s................................................................................................................................................................................. HYDROLOGY Field Date: 4125106 Field Observations: Recorded Data (gauge or well): Depth o pit ..5._,.. ............................................................ ........................................................................................................................ Depthto saturation surface ........................................................................................................................ Depth to free water/water table 11" Notes{inlet/outlet, etc.): Inundationdepth N/A ...................................................................................................................... Other indicators: Wetland Hydrology? g Yes ❑No Rationale: Soil saturation within major portion of the root zone indicate wetland hydrology ................................................................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? g Yes ']No Classification Palustrine, emergent, persistent wetland (PEM1) ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: MM RAI Project#: 2006-038-002 Table B.3 Delaney Park Wetland and Wildlife Assessment. Sample Plot 3, located in depression in center of«%etland A. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Shrubs and Saplings � � Herbs ! Veronica scufeUata 2 15.0 1.0 15.0 Glyceria elafa 2 15.0 1.7 25.1 Galium trifidium 2 15.0 1.7 25.5 Juncus spp. 2 15.0 2.0 30.0 Ranunculus repens + 2.5 2.0 5.0 Po/ygonum spp. 3 � ; I I �I I SUMS 62.5 100.6 Weighted Mean Index: 1:61................ o Hydrophytic /o of dominant species with a WIS vegetation: Yes index of 3.0 or less: 1.Q9.:4R.......................................... Veg Notes .................................................................................................... ............................................................................................ ..............................................................................................................................................................................................., Wildlife & ................................................................................................................................................. Habitat Features "��"'"""�"'"� ............................................................................................................................................................................... (snags, logs, etc.} ---��-----�--�--------------------------�--...._..--�--�--��-�-----..._........_..--��--��---.._...---�--�-�-��--��----....................----��---.....--��-�--�--�--...... Field Date: 4/25/06 RAI Observers: MJM, LCD RAI Project#: 2006-038-002 Table B.3 Continued. SOIL Soil pit number 3.........................................„ Field observations confirm mapped type? ❑Yes p No Map Unit (Series/Phase) Alderwood gravelly.sandy.loam,..........., On hydric list? p Yes ❑ No ......................... Map Symbol A�gB............................ ...... H dric inclusion� .................................................... .......... y . ❑Yes ❑ No Profile: Matrix Color Mottle Quantity, Mottle Color ' Depth Horizon (moist) Size, Contrast (moist) Texture I i � Soil Profile Soils,not.sampled.due to.inundation. ... ................................................................................................................ Notes: ............... ....................................:....................................................................................................................................... Hydric Soil Indicators (check): �Histosol �Aquic Moisture Regime ]Concretions ❑Histic Epipedon ❑Reducing Conditions �High Organic Surface (sandy soils) ❑Sulfidic Odor ❑GleylLow Chroma [Organic Streaking (sandy soils) Hydric Soil Criteria Met? �Yes ❑No Rationale Assumed due topondin.g,durin.g..growin,g season.................. ... ........................... . ....................................................................... ................................................................................................................................................................................................... HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depth of pit N/A..................... ..................,.......................................................:. ......................................... ............................................ Depth to saturation surface ............................................................................................................. Depth to free water/water table surface Notes (inlet/outlet, etc.): � Inundationdepth 7" ............................................................................................... I Other indicators Wetland Hydrology? �Yes ❑No Rationale: �nundation during growing season ................................................................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? �Yes 'L No Classification Palustrine, emergent, persistent wetland (PEM1) ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: MJM, LCD RAI Project#: 2006-038-002 Table B.4 Delaney Park��'etland and�'��ildlife Assessment. Sample Plot l; located east of �� Flag A-7, adjacent to the east portion of Wetland A. �'�, VEGETATION Cover Cover WIS Product of '' Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees I i i i Shrubs and Saplings I Herbs Holcus lanatus 2 15.0 3.0 45A Hypochaeris radicata 2 15.0 4.0 60.0 Trifolium repens 1 2.5 3.0 7.5 Rumex acefose!!a + 2.5 3.7 9.2 Musci 3 0.0 0.0 0.0 Poa spp. 5 SUMS 35.0 121J Weighted Mean Index: 3:48,,,,,,,,,,,,,,,,,,,,,,,, % of dominant species with a WIS Hydrophytic index of 3.0 or less: vegetation: No 50.00 ................................................................. Veg Common,velvetg.rass,does,not.provide,at,least,20%.cover and,thus,is,not.dominant;,,,,,,,, Notes ....................................................... . ........................................................................................................................................ ................................................................................................................................................................................................ Wildlife 8� ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ....................................... ........................................................................................................................................ Field Date: 4/25/06 RAI Observers: MM, LCD RAI Project#: 2006-038-002 Table B.4 Continued. SOIL Soil pit number 1 , Field observations confirm mapped type? ❑Yes � No ............................................. Map Unit(Series/Phase) Alderw.00d..gravelly.sandy.loam,..........., On hydric list? p Yes � No Map Symbol AgB................ Hydric inclusion� ............................................................................... ❑Yes ❑ No Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-10" black(10YR 2/1) few,fine, distinct daric yellowish brown gravelly sandy loam (10YR 4/6) � 10-15+" dark yellowish brown many,fine,faint dark yellowish brown gravelly sandy loam � (10YR 3/4) (10YR 4/6) ! II i Soil Profile Lots of gravel..and_cobbles:. I ............... ................................................................................................................................... Notes: ...................................................................................................................................................................................... Hydric Soil Indicators (check): _ Histosol ❑Aquic Moisture Regime ❑Concretions � Histic Epipedon �= Reducing Conditions ❑High Organic Surface (sandy soils) ❑Sulfidic Odor ❑Gley/Low Chroma ❑Organic Streaking (sandy soils) Hydric Soil Criteria Met? ,�Yes �No Rationale Soils.with bright.matrix.chroma.(>2�.immediately,below.'A' horizon or 10" are ........ .... . ...... ....................................................................... ch.ar.��r.i�tic.Qf..u�l�nd..sail�.................................................................................................................................... HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depth of pit 15"........................................ ....................... ........................................................................................................................ Depth to saturation 10'......... ........................................................................................................ ..................................... ................ Notes (inleUoutlet, etc.): Depth to free water/water table 15".,..... .,. ...................................................................................................................... Inundationdepth 0". ...................................................................................................................... .. .................................................. Other indicators ...................................................................................................................................................................................... Wetland Hydrology? J Yes �No Rationale: Soils.not.saturated_within.major.portion.of.root.zone;.lack.of.hydric.soil..indi.cators.and....._ l�Gk.of..damin��.t.1:iy.dr.�phitic..u�q�.t�tion.s.u�g�si.s.a�ur�tion.nQt.Rr.�s�nt.d�rio�..�ar.l�r ......... arowina season. CLASSIFICATION Wetland Criteria Met? _;Yes �No Classification Upland.grassland................ .......................................................................................................................... ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: MM, LCD RAI Project#: 2006-038-002 Table B.5 Delaney Park Wetland and Wildlife Assessment. Sample Plot 8, located south of Flag 5-B, in north-central portion of Wetland B. VEGETATION Cover Cover WIS Product of Index Class index Midpoint and ' Scientific name Value Midpoint Value WIS Value Trees Alnus rubra 3 37.5 3.0 112.5 Thu�a licafa 1 2.5 3.0 7.5 Shrubs and Saplings Rubus s ectabilis 3 37.5 2.7 100.1 S iraea dou lasii 2 15.0 2.0 30.0 ; Lonicera involucrata 2 15.0 2.7 40.1 � Herbs Phalaris arundinacea + 2.5 2.0 5.0 Athyrium filix-femina + 2.5 3.0 7.5 SUMS 112.5 302.7 ' Weighted Mean Index: 2.69 ..................................... I o Hydrophytic /o of dominant species with a WIS vegetation: Yes I� index of 3.0 or less: 1.Q�.:R�......................................... ......... I Veg �I Notes ................................................................................................................ ................................................................................ ................................................................................................................................................................................................ Wildlife 8� Pileated wood ecker observed fl in in vicini of sam.le .lot Amencan robin ...............................P.......................................X...9..................�!................P.....R.....:...................................... Habitat Features �nd..�t�JJ.ar.'s.J�X..aJ.�o..�b.��n!�d......................................................... ................................................... (snags, logs, etc.) -��---....._..-�...................��-�-----��--�--...._...---�----��--�--.....-�--��--��-------�--..._......._..---�---..................---�---�---.....--��-�-------....... Field Date: 4/25/06 RAI Observers: MM RAI Project#: 2006-038-002 Table B.5 Continued. SOIL Soil pit number 8........................................... Field observations confirm mapped type? ❑Yes �No Map Unit (Series/Phase) Alderw.00d..gravelly.sandy_loam............. On hydric list? ❑Yes �No Map Symbol A9B............................................................................................... Hydric inclusion? ❑Yes ❑ No Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture ' i I Soil Profile No.soils_sampled..:too.much inundation........................ .................................. ................................................................................. Notes: ............................................................................................................................................................................................... Hydric Soil Indicators(check): ❑Histosol gl Aquic Moisture Regime �Concretions ❑Histic Epipedon ❑Reducing Conditions ❑ High Organic Surface (sandy soils) ❑Sulfidic Odor J Gley/Low Chroma ❑Organic Streaking (sandy soils) Hydric Soil Criteria Met? '�Yes ❑No Rationale Soils_assumed to be hydric,based..on..in.undation._during_growing.season_ ............................. ..................................... ................................................................................................................................................................................................... HYDROLOGY Field Date: 4/25106 Field Observations: Recorded Data (gauge or well): Depth of pit NA............ .................................... ................................................... ...............................................................................,..., Depthto saturation surface ........................................................................................................................ Notes (inletloutlet, etc.): Depth to free water/water table surface Inundationdepth 4" ............................................................................................. .............. Other indicators: Wetland Hydrology? �Yes ]No Rationale: Inundation indicates wetland hydrology. ................................................................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? �Yes [ No Classification Palustrine, forested, broad-leaved deciduous wetland (PF01) ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: MM RAI Project#: 2006-038-002 Table B.6 Delaney Park Wetland and Wildlife Assessment. Sample Plot 5, located west of Flag B-2, in southwest portion of VVetland B. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees I j Shrubs and Saplings Rubus discolor 2 15.0 4.0 60.0 I Herbs Agrostis spp. 5 87.5 2.5 218.8 Juncus effusus 4 62.5 2.0 125.0 Geum macrophylJum + 2.5 2.3 5.8 � Musci 3 0.0 0.0 0.0 i � SUMS 167.5 409.6 Weighted Mean Index: 2.45 ..................................... o Hydrophytic /o of dominant species with a WIS vegetation: Yes index of 3.0 or less: ��............................................... Veg Notes .................................................................................................. .............................................................................................. ................................................................................................................................................................................................ Wildlife 8� ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ..........................��----�---�------�-�--�-�--��-�---�-�--�--................--��--��--�-�--.._..........--��--�----��----�--��--��---��----..._....................... Field Date: 4/25/06 RAI Observers: LCD RAI Project#: 2006-038-002 Table B.6 Continued. SOIL Soil pit number 5................ ......_...,... Field observations confirm mapped type? ❑Yes � No Map Unit (Series/Phase) Alderwood..gravelly.sandy.loam............. On hydric list? ❑Yes � No Map Symbol AgB............................. .................... Hydric inclusion? ❑Yes ❑ No ... ............................................ Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-12" black (10YR 2/1) fine sandy loam 12-16+" dark brown (10YR 3/3) loamy sand Soil Profile Some charcoal from 0-12". Some cobbles below 12". ............................................................................................................................................................................................... Notes: .................................................................................................................................................................... I ........................... Hydric Soil Indicators (check): ' �Histosol ❑Aquic Moisture Regime C Concretions i�Histic Epipedon ❑Reduci�g Conditions [ High Organic Surface (sandy soils) ❑Sulfidic Odor �Gley/Low Chroma C Organic Streaking (sandy soils) Hydric Soil Criteria Met? �'g'�Yes ❑No Rationale Soils immediately.below.10°.have a matrix chroma of 1 ... ............................... .............................................................................................................................. ..........................................................................................................................................................:........................................ HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depthof pit 16"................................................ ........... ........................................................................................................................ Depthto saturation <2" ........................................................................................................................ Notes (inletloutlet, etc.): Depth to free water/water table $" Inundationdepth N/A ...................................................................................................................... Other indicators: Wetland Hydrology? �Yes ❑No Rationale: Soil saturation and free water within major portion of root zone indicate wetland hYdCR1.0�Y........................................................................................................................................................................... CLASSIFICATION Wetland Criteria Met? �Yes �No Classification Palustrine, emergent, persistent wetland (PEM1) ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: LCD RAI Project#: 2006-038-002 Table B.7 Delaney Park VVetland and Wildlife Assessment. Sample Plot 7, upland sample plot located east of Flag B-2, near southwest portion of Wetland B. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees � Shrubs and Saplings Rubus laciniatus 3 37.5 3.7 137.6 ' Rubus s ectabilis + 2.5 2.7 6.7 ' Herbs Agrosfis spp. 3 37.5 2.5 93.8 Holcus lanatus 1 2.5 3.0 7.5 Juncus effusus + 2.5 2.0 5.0 I SUMS 82.5 250.6 Weighted Mean Index: 3:04................... .. o Hydrophytic /o of dominant species with a WIS vegetation: No index of 3.0 or less: 5Q�4Q.................. ....................... Veg Notes ................................................................................................. . .............................................................................................. ................................................................................................................................................................................................ Wildlife & ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ........--�-------�....................................�----��----��----...........---------�--...................................-�----��--�----��---....---.................. Field Date: 4/25/06 RAI Observers: LCD RA1 Project#: 2006-038-002 Table B.7 Continued. SOIL Soil pit number 7........................................... Fieid observations confirm mapped type? O Yes � No Map Unit(Series/Phase) Alderwood..gravelly.sandy.loam............. On hydric list? ❑Yes � No Map Symbol Ag6........................... .. ........ Hydric inclusion? p Yes p No Profile: Matrix Color Mottle Quantity, Mottle Color I Depth Horizon (moist) Size, Contrast (moist) Texture ' 0-4" black(10YR 2/1) sandy loam , 4-16+" dark yellowish brown strong brown (7.5YR gravelly sandy loam ' (10YR 4/4) 4/6) SoilProfile ............................................................................................................................................................................................... N otes: .............................................................................................................................................:.................................. ............... Hydric Soil Indicators (check): ❑ Histosol `Aquic Moisture Regime ❑Concretions ❑ Histic Epipedon i_Reducing Conditions ❑ High Organic SurFace (sandy soils) ❑Sulfidic Odor '�`Gley/Low Chroma ❑Organic Streaking (sandy soils) Hydric Soil Criteria Met? [Yes �No Rationale Soils_with bri�ht.matrix_chroma..(>2�.immediately.below..'A'horizon or 10" are ......... ...... ..... ....................................................................... �h.ar.��t�r.i�.ti�.Qf..u�l�nd..sails.................................................................................................................................... HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depth of pit 16"................................ ......................................................................................................................., ............................... Depthto saturation 6" ........................................................................................................................ Notes (inleUoutlet, etc.): Depth to free waterlwater table �2'� Inundationdepth 0" ...................................................................................................................... Other indicators: Wetland Hydrology? �Yes I '�No Rationale: Soil saturation and free water within 12"of surface indicate wetland hydrology ................................................................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? ❑Yes �i No Classification Area lacks indicators for all three criteria for wetland - Upland shrubland (S) ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: LCD RAI Project#: 2006-038-002 Table B.8 Delaney Park Wetland and Wildlife Assessment. Sample Plot 16, wetland sample plot at east edge of Wetland C. VEGETATION Cover Co�er WIS Product of Index Ciass Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Shrubs and Saplings �'Po ulus ba/samifera s + 2.5 3.0 7.5 � Herbs Holcus lanatus 2 15.0 3.0 45.0 Poa spp. 4 � i � I SUMS 17.5 52.5 Weighted Mean Index: 3.00 ..................................... o Hydrophytic /o of dominant species with a WIS vegetation: Yes index of 3.0 or less: 1.Q0;00,,,,,,,,,,,,,,,,,,,,,,,,,, ........................ Veg I Notes ............................................................. , .............................................................................................. , ..................................... ................................................................................................................................................................................................ Wildlife 8� ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ................�--�--��--------...._..---�--��---........-�-�-�-------�--��--�-��--------�-----.._...--�------�--......... �-� ............................................ Field Date: 4/25/06 RA1 Observers: MJM, LCD RAI Project#: 2006-038-002 Table B.8 Continued. SOIL Soil pit number 16 , Field observations confirm mapped type? ❑Yes ❑ No ............................................. Map Unit (Series/Phase) Alderwood graveliy.sandy.loam,..,.._...... On hydric list? ❑Yes ❑ No ..... ................ Map Symbol AgB/AgC................ Hydric inclusion? ❑Yes ❑ No ..................................................................... Profile: Matrix Color Mottle Quantity, Mottle Color i Depth Horizon (moist) Size, Contrast (moist) Texture 0-16" black(10YR 2/1) gravelly sandy loam j I Soil Profile Some.chroma 2.soils,mixed.in;,redoximorphic.features,throughout,,...,,.. ..................................... Notes: ............................................................................................................................................................................................... Hydric Soil Indicators (check): �] Histosol ❑Aquic Moisture Regime ,�Concretions � Histic Epipedon ]Reducing Conditions ❑High Organic Surface (sandy soils) ❑Sulfidic Odor �Gley/Low Chroma ❑Organic Streaking (sandy soils) Hydric Soil Criteria Met? �Yes �No Rationale Soils immediately,below.the'A'horizon or 10" have a matrix chroma of 1. .................................... .......................................................................................................................................... ................................................................................................................................................................................................... HYDROLOGY Field Date: 4/25106 Field Observations: Recorded Data (gauge or well): ept o pit ...................................................................... ........................................................................................................................ Depthto saturation 12" ........................................................................................................................ Depth to free water/water table 16" Notes (inlet/outlet, etc.): Inundationdepth ............................................................................. ......................................... Other indicators: Wetland Hydrology? �Yes �No Rationale: Hydrology likely present in early part of the growing season, based on hydric soils and hy.dr.QAhiti.c.v��etatian................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? �Yes [No Classification ..............................�--................................................................................................................................................ Field Date: 4/25/06 RAI Observers: MJM, LCD RAI Project#: 2006-038-002 Table B.9 Delaney Park Wetland and Wildlife Assessment. Sample Plot l0, located east of Flag C-1, in northern portion of Wetland C. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Alnus rubra 2 15.0 3.0 45.0 Po ulus balsamifera 2 15.0 3.0 45.0 ! Thu'a licata 1 2.5 3.0 7.5 Shrubs and Saplings Alnus rubra s 1 2.5 3.0 7.5 �Po ulus balsamifera s 1 2.5 3.0 7.5 Rubus laciniafus + 2.5 3.7 9.2 i Herbs Ranunculus repens 2 15.0 2.0 30.0 Athyrium filix-femina 2 15.0 3A 45.0 Tellima grandiflora 2 15.0 5.0 75.0 Chrysanthemum leucanthemum 1 2.5 5.0 12.5 Gramineae 2 0.0 0.0 0.0 SUMS 87.5 284.2 Weighted Mean Index: 3.25......._,.. ................. o Hydrophytic /o of dominant species with a WIS vegetation: Yes index of 3.0 or less: $Q�QQ................................................ Veg Notes ......................................................................... ....................................................................................................................... ................................................................................................................................................................................................ Wildlife 8� ............................................................................................................................................................................ Habitat Features �� ............................................................................................................................................................................... (snags, logs, etc.) -�- --�...........................�-�---�-��---.....--��---��---..._.._...-�--�---.._...-------�--- -------�--�-----�--............---�--..............---------.......... Field Date: 4/25/06 RAI Observers: MM, LCD RAI Project#: 2006-038-002 Table B.9 Continued. SOIL ' Soil pit number 10......_,. .... Field observations confirm mapped type? ❑Yes �No ........................... Map Unit (Series/Phase) Aldennrood._gravelly.sandy.loam............. On hydric list? ❑Yes � No Map Symbol AgB........................................ ........ .............. Hydric inclusion? ❑Yes O No ....... ........................... Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-15+" very dark grayish brown many, medium, dark yellowish brown sandy loam (10YR 3/2) (10YR 3/4) � Soil Profile ............................................................................................................................................................................................... Notes: ............................................................................................................................................................................................... Hydric Soil Indicators(check): ] Histosol ]Aquic Moisture Regime [Concretions J Histic Epipedon _I Reducing Conditions [ High Organic Surface (sandy soils) �Sulfidic Odor ��Gley/Low Chroma ❑Organic Streaking (sandy soils) Hydric Soil Criteria Met? ';�Yes ❑No Rationale Soils.immediately.below.1.0:'.have a matrix chroma.of 2.or.less.with.redoximorphic............... .. .... ....................... .............................. .. . f.�.axur.��................................................................................................................................................................................. HYDROLOGY Field Date: 4125/06 Field Observations: Recorded Data (gauge or well): ept o pit ...................................................................... ........................................................................................................................ Depthto saturation 9" ........................................................................................................................ Notes (inlet/outlet, etc.): Depth to free water/water table �2'� Inundation depth 0" .......................................................... ............................................................ Other indicators: Wetland Hydrology? �Yes ❑No Rationale: Soil saturation as well as hydric soils and hydrophytic vegetation indicate soils satur.�t�d..w..ithin.m�ior..p.Qr.ti.an.of..r.aot..zon�..�u�ing.e�dy..par.tion..�f.�r.nwinQ s�.asnn.............. CLASSIFICATION Wetland Criteria Met? �Yes �No Classification Palustrine, forested, broad-leaved deciduous wetland (PF01) ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: MM, LCD RAI Project#: 2006-038-002 Table B.10 Delaney Park Wetland and Wildlife Assessment. Sample Plot 12, located��vest of Flag C-1, in uplands adjacent to the northwest portion of Wetland C. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Shrubs and Saplings 'Rubus s ectabilis + 2.5 2.7 6.7 Rubus laciniatus + 2.5 3.7 9.2 Herbs ' Hypochaeris radicafa 1 2.5 4.0 10.0 ' Chrysanfhemum leucanfhemum + 2.5 5.0 12.5 Musci 2 0.0 0.0 0 A Poa spp. 4 { SUMS 10.0 38.4 Weighted Mean Index: 3.84 ..................................... ' % of dominant species with a WIS Hydrophytic index of 3.0 or less: vegetation: No NQ.�.q.minant.s��ie$,fo�nd,.,,, Veg Notes .................................................................................................... ............................................................................................ ................................................................................................................................................................................................ Wildlife & ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) -�-�...........................��---....._..--�-�--��--�-�---��-----------�---�------�----.._..---........................_..._....--�----��---��-----._........._............ Field Date: 4l25/06 RAI Observers: MM/LCD RAI Project#: 2006-038-002 Table B.10 Continued. SOIL Soil pit number 12 . Field observations confirm mapped type? ❑Yes �No ............................................. Map Unit (Series/Phase) Alderwood..gravelly.sandy.loam,.,...,..._., On hydric list? p Yes �No ...................... Map Symbol A�gB............................. .. Hydric inclusion? p Yes p No ................................................................. Profile: Matrix Color Mottle Quantity, Mottle Color ' Depth Horizon (moist) Size, Contrast (moist) Texture 0-9" very dark brown( 10YR few, medium,distinct dark yellowish brown (no texture) 2/2) (10YR 3/6) � 9-16+" dark brown (10YR 3/3) common,fine, distinct dark yellowish brown (no texture) ' (10YR 3/6) I , '� I Soil Profile ............................................................................................................................................................................................... Notes: ............................................................................................................................................................................................... Hydric Soil Indicators (check): ❑ Histosol `Aquic Moisture Regime [Concretions ❑ Histic Epipedon � Reducing Conditions [ High Organic Surface (sandy soils) [Sulfidic Odor !_Gley/Low Chroma [Organic Streaking (sandy soils) Hydric Soil Criteria Met? ❑Yes �,'g No Rationale Soils with bri�ht.matrix.chroma,.(>2�..immediately.below'A' horizon or 10"are .......................... .... .......... ....................................................................... �b.ar.��t�r.i�.tic.�f..u�l�nd..s.ail�.................................................................................................................................... HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depth of pit 16".............................................. ... ........................................................................................................................ .... .......... Depthto saturation 9" ........................................................................................................................ Notes (inlet/outlet, etc.): Depth to free water/water table >16" Inundation depth 0" ................................................................................... ................................... Other indicators: Wetland Hydrology? �]Yes �No Rationale: Soils not saturated within major portion of root zone; lack�f hydric soil indicators suQQ�st..��t.ur.ati4.n..n.at.pr.�s�.ot.du.�inQ.e�d.Y.�r.Qwin�.s�asQ.n.............................................................. CLASSIFICATION Wetland Criteria Met? J Yes �No Classification Area lacks indicators for all three wetland criteria - Upland grassland ................................................................................................................................................................................. Field Date: 4125/06 RAI Observers: MM/LCD RAI Project#: 2006-038-002 Table B.l 1 Delaney Park VVetland and�'�ildlife Assessment. Sample Plot 14, upland located just east of the east portion of Wetland C. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Shrubs and Saplings i � , Herbs Ranunculus repens 3 37.5 2.0 75.0 Holcus lanatus 2 15.0 3.0 45.0 Rumex crispus + 2.5 2.7 6.7 ' Poa spp. 4 SUMS 55.0 126.7 Weighted Mean Index: 2.30 ..................................... o Hydrophytic /o of dominant species with a WIS vegetation: Yes index of 3.0 or less: 1.QR.:QR.............................. ......... Veg Notes .................................................................................... ............................................................................................................ ................................................................................................................................................................................................ Wildlife � ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) .....----��------��---�--------�--------------�- �--�..................................�--�--�-��--��-----��----..._.._..-----��------�---�---.................._.......---�- Field Date: 4/25/06 RA1 Observers: MJM, LCD RAI Project#: 2006-038-002 Table B.11 Continued. SOIL Soil pit number 14 ......................... Field observations confirm mapped type? ❑Yes ❑ No ..................... Map Unit(Series/Phase) Alderw.00d.gravelly.sandy.loam,..,......... On hydric list? p Yes p No Map Symbol A�gB/A9C.................................................................................... Hydric inclusion? ❑Yes ❑ No Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-6" black(10YR 2/1) sandy loam ' 6-8" yellowish red (5YR 4/6} loamy sand 8-16" very dark brown (10YR sandy loam 2/2) Soil Profile Some.mottles_in,upper 6..inches;..charcoal.at.6-8". ................................................................................... Notes: ............................................................................................................................. .................................................................. Hydric Soil Indicators(check): � Histosol ❑Aquic Moisture Regime ❑Concretions � Histic Epipedon J Reducing Conditions ❑ High Organic Surface(sandy soils) ]Sulfidic Odor ❑Gley/Low Chroma [Organic Streaking (sandy soils) Hydric Soil Criteria Met? ❑Yes ��No Rationale Chrama 2 soils without redoximorphic.features immediatelx.below.'A' horizon or 10" do .......................................................................... .................................. .............................................. nQt..�di��t�.hYdr.i�..soils................................................................................................................................................ HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depth of pit 16+„ ........................................................................................................................ ...................................................................... Depthto saturation 13" ........................................................................................................................ , Notes (inletloutlet, etc.): Depth to free water/water table �6" � Inundationdepth N/A ...................................................................................................................... � Other indicators: Wetland Hydrology? _Yes �No ' Rationale: No saturation/free water in major portion of root zone. ................................................................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? I�Yes �No Classification Upland grassland ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: MJM, LCD RAI Project#: 2006-038-002 Table B.12 Delaney Park Wetland and Wildlife Assessment. Sample Plot 20, located south of Flag D-5, in northern portion of Wetland D. VEGETATION Cover Cover WIS Product of � Index Class Index Midpoint and ' Scientific name Value Midpoint Value WIS Value Trees Shrubs and Saplings ( Herbs Ranunculus repens 2 15.0 2.0 30.0 Mentha spp. 2 15.0 2.0 30.0 Trifolium repens 2 15.0 3.0 45.0 Taraxacum officinale + 2.5 4.0 10.0 ; Poa spp. 5 � ; � , S U MS 47.5 115.0 Weighted Mean Index: 2.42 ..................................... Hydrophytic % of dominant species with a WIS vegetation: Yes index of 3.0 or less: �qp,QQ Veg Mowed area Notes ................................................... ............................................................................................................................................. ................................................................................................................................................................................................ Wildlife & ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) .......................�-��------�--�--�--...._........-�----...._.............._ �----.....-�........................�---...............---�-----------�--�---...--�---��- �-- Field Date: 4/25/06 RAI Observers: LCD/MM RAI Project#: 2006-038-002 Table B.12 Continued. SOIL Soil pit number 20 .._....., Field observations confirm mapped type? ❑Yes � No ..................................... Map Unit (Series/Phase) Aldervvood._gravelly.sandy.loam............. On hydric list? ❑Yes �No Map Symbol Ag6................................ -. Hydric inclusion? ❑Yes ❑ No ............................................................. . Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-4" dark grayish brown fine sandy loam (10YR 4/2) 4-fi" gray(2.5Y 5/1) (mottles present) loamy sand i I 6-12" black(10YR 2/1) fine sandy loam Soil Profile ............................................................................................................................................................................................... Notes: ............................................................................................................................................................ ................................... Hydric Soil Indicators (check): ❑ Histosol ❑Aquic Moisture Regime —1 Concretions � Histic Epipedon ❑Reducing Conditions _ High Organic Surface (sandy soils) ]Sulfidic Odor �Gley/Low Chroma [Organic Streaking (sandy soils) Hydric Soil Criteria Met? g Yes �No Rationale Soils.immediately.below.the..'A' horizon have a matrix chroma of 1 . . .. .... ....................................................................................................................... ................................................................................................................................................................................................... HYDROLOGY Field Date: 4125/06 Field Observations: Recorded Data (gauge or well): Depth of pit 16" ........................................................................................................................ ...................................................................... Depthto saturation 8" ........................................................................................................................ Depth to free water/water table 14' , Notes (inleUoutlet, etc.): Inundationdepth 0" ...................................................................................................................... Other indicators: Wetland Hydrology? �Yes �` No Rationale: Soil saturation as well as hydric soils and hydrophytic vegetation indicate likely soils �atur.�t��..w.ithio..m�iA�..p.arti.an.af..r.aoi..zon�..�urinQ.e�dY.�or.tioo..Af.9r.Q.wing.s�.asn.o.............. CLASSIFICATION Wetland Criteria Met? ,�Yes �No Classification Palustrine, emergent, persistent wetland (PEM1) ......................�---....................................................................................................................................................... Field Date: 4/25/06 RAI Observers: LCD/MM RAI Project#: 2006-038-002 Table B.13 Delaney Park Wetland and Wildlife Assessment. Sample Plot 22, located north of Flag D-5, in upland adjacent to northern portion of Wetland D. VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees i I , � i j ' Shrubs and Saplings Herbs Holcus lanatus 2 15.0 3.0 45.0 ' Mentha spp. 1 2.5 2.0 5.0 Rumex crispus + 2.5 2.7 6.7 ; Trifolium repens + 2.5 3.0 7.5 � Taraxacum offrcinale + 2.5 4.0 10.0 � ' Poa spp. 5 � � SUMS 25.0 74.2 Weighted Mean Index: 2.97 ..................................... % of dominant species with a WIS Hydrophytic vegetation: Yes index of 3.0 or less: 1.QQ.:Q4............................................... Veg Common velvetgrass covers less than 20% of area and thus is not dominant Notes ................................................................................................................... ............................................................................. ................................................................................................................................................................................................ Wildlife & ............................................................................................................................................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) Field Date: 4/25/06 RAI Observers: LCD, MJM RAI Project#: 2006-038-002 Table B.13 Continued. SOIL Soil pit number 22.......................... . . Field observations confirm mapped type? �Yes p No Map Unit(Series/Phase) Alderwood..gravelly.sandy,loam............. On hydric list? ❑Yes � No Map Symbol Ag61AgC....................................... ...... Hydric inciusion? ❑Yes ❑ No ....................................... Profile: Matrix Color Mottle Quantity, Mottle Color Depth Horizon (moist) Size, Contrast (moist) Texture 0-6" very dark brown (10YR fine sandy loam I! 212) ; 6-16+" dark brown (10YR 313) (mottles present) fine sandy loam � I Soil Profile Mottles not described ............................................................................................................................................................................................... Notes: .......................................................................................................................................................................................... Hydric Soil Indicators (check): � �Histosol ❑Aquic Moisture Regime =Concretions `` Histic Epipedon ❑Reducing Conditions ❑High Organic Surface (sandy soifs) C'Sulfidic Odor ❑Gley/Low Chroma ❑Organic Streaking (sandy soils) Hydric Soil Criteria Met? ❑Yes �No Rationale Soils with bri�ht.matrix.chroma..(>2.j.immediately.below'A' horizon or 10" are ........................... ....................................................................... ch.ar.��t�r.i�tic.Qf..u�l�nd..sail�.................................................................................................................................... HYDROLOGY Field Date: 4/25/06 Field Observations: Recorded Data (gauge or well): Depthof pit 16"............................................................... ........................................................................................................................ Depthto saturation 0" ........................................................................................................................ Depth to free water/water table 13' , Notes (inlet/outlet, etc.): Inundationdepth 0" .................................................................................. .................................... Other indicators Wetland Hydrology? �Yes [No Rationale: Soil saturation within 12"of surface during growing season indicates wetland hydrology ................................................................................................................................................................................................ CLASSIFICATION Wetland Criteria Met? ❑Yes �No Classification Area lacks indicators for all three criteria- Upland grassland ................................................................................................................................................................................. Field Date: 4/25/06 RAI Observers: LCD, MJM RAI Project#: 2006-038-002 Table B.15 Delaney Park Wetland and Wildlife Assessment. Sample Plot 1-A, located in the south-central portion of the site, west of residential structures. VEGETATION ONLY VEGETATION Cover Cover WIS Product of � Index Class index Midpoint and Scientific name Value Midpoint Value WIS Value Trees ' Thu'a licata 3 37.5 3.0 112.5 Pseudotsu a menziesii 2 15.0 4.0 60.0 Tsu a hetero h lla 2 15.0 4.3 65.0 � P rus s . r 2.5 4.3 10.8 Shrubs and Saplings Sambucus racemosa + 2.5 4.0 10.0 ' Hedera helix + 2.5 5.0 12.5 „ Herbs Ranunculus repens 1 2.5 2.0 5.0 Taraxacum officinale 1 2.5 4.0 10.0 Cirsium vulgare r 2.5 4.0 10.0 � Gramineae 5 0.0 0.0 0.0 ; Viola spp. 1 � I I i i � i �i SUMS 82.5 295.7 Weighted Mean Index: 3,;�8,,,,,,,,,,,,,,,,,,,, o Hydrophytic /o of dominant species with a WIS vegetation: No index of 3.0 or less: 33.33 ................................................................. Veg Area.cons.ists.of_mowed.lawn,with.�cattered,maturewestern,hemlock,.Douglas;fr�.and., Notes western red cedar. Most conifers are >32"dbh. ................................................................................................................................................................................................ ................................................................................................................................................................................................ Wildlife 8� No„$ig,nifcant,h��itat.fg�.t�,r��.within_plQt„y,iGini,t�,;,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, .......................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) .................................................................................... . .......................................................................................... Field Date: 10/19/06 RAI Observers: JEL RAI Project#: 2006-038-002 Table B.14 Delaney Park Wetland and Wildlife Assessment. Sample Plot 2-A, located in the north-central portion of the site, in the western part of the horse pasture. VEGETATION ONLY VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Pseudofsu a menziesii 1 2.5 4.0 10.0 Shrubs and Saplings �' S m horicar os albus 2 15.0 4.0 60.0 Rubus laciniatus 1 2.5 3.7 9.2 Rubus discolor 1 2.5 4.0 10.0 , Herbs ', Senecio jacobaea 2 15.0 4.0 60A � Rumex obtusifolius 1 2.5 3A 7.5 ' Gramineae 4 0.0 0.0 0.0 SUMS 40.0 156.7 Weighted Mean Index: 3.;92,,,,,,,,,,,,,,,,,,,,,,,,,,,, o Hydrophytic /o of dominant species with a WIS vegetation: No index of 3.0 or less: 0.00 ................................................................. Veg Very.,p�tchy._shrub,lay.er,,.Most,herbaceous,ve,getation,ha�.been,grazed.;,..Much.of the,.,, Notes area consists.of.bare..ground,from horse troddmg......... ......... ......... ......... ......... ......... ................................................................................................................................................................................................ Wildlife 8 NQ.,$i�nifcant.ha�it�t,f��t�r,�$,ir�,p�pt_vi�inity,,,,,,,,,,,,,,,,,,,,,, ......................................................... Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ........................................................ Field Date: 10!19/06 RAI Observers: JEL RAI Project#: 2006-038-002 Table B.15 Delaney Park Wetland and Wildlife Assessment. Sample Plot 1-A, located in the south-central portion of the site, west of residential structures. VEGETATION ONLY VEGETATION Cover Cover WIS Product of Index Class Index Midpoint and Scientific name Value Midpoint Value WIS Value Trees Thu'a licafa 3 37.5 3.0 112.5 Pseudotsu a menziesii 2 15.0 4.0 60.0 Tsu a hetero h 11a 2 15.0 4.3 65.0 P rus s . r 2.5 4.3 10.8 i Shrubs and Saplings Sambucus racemosa + 2.5 4.0 10.0 Hedera helix + 2.5 5.0 12.5 � ,, � i Herbs Ranunculus repens 1 2.5 2.0 5.0 Taraxacum o�cinale 1 2.5 4.0 10.0 Cirsium vulgare r 2.5 4.0 10.0 Gramineae 5 0.0 0.0 0.0 I , Viola spp. 1 , SUMS 82.5 295.7 Weighted Mean Index: �,,�8,,,,,,,,,,,,,,,,,,,,,,,,,,,, a Hydrophytic /o of dominant species with a WIS vegetation: No index of 3.0 or less: 33.33 ................................................................. Veg Area,�onsists,of,mowed,lawn.with.$�ttergd,mat,�re we,$t�rn.hemlo�k,.Qouglas-fr�.and,. Notes western..red cedar Most conifers are>32..dbh ......... ......... ......... ......... ...................... ................................................................................................................................................................................................ Wildlife 8� N,q,�i,gnifc�n,�,h��jt�t,f�at�r,�$,wi�hi�,plQt,,,v,j�ini,�y,;,,,,,,,,,,,,,,,,,,,, ................................................ Habitat Features ............................................................................................................................................................................... (snags, logs, etc.) ............................................................................................. .................................................................................. Field Date: 10/19/06 RAI Observers: .1EL RAI Project#: 2006-038-002 APPE�DIX C «'SDOT (2000) Field Rating Forms � � � } ` 19 � i � � " . '-1� � gey to HGD�Wetland Classification: Washington Wetland Type 4 ` ` Wetland I\Tame: � ��:i �� - � \�1.1��..` ; /� Date: �1�L �l�S��" ' �� ?� 1) Water levels in wetland usually controIled by tides �o—go to 2 Yes—Tidal Fringe 2) Toppgraphy is flat and precipitationis onty source (>90%)of wates to the wetland `�'�o—go to 3 Yes—Fiat 3) Wetland is contiguovs with> 8 ha (19.8 ac)open cvztes,and water is deeper than 2 m(6.6 ft) over 30%of open waterarea �2Co—go to 4 Yes—Lacnstrine Fringe 4) Open mates is <8 ha(19.8 ac) and>2 m(6.6 ft) deep,but wetland is a ftinge naaower than'/z the radius of open water 'T o—go to 5 Yes—Lacustrin e Fri.nge 5) Water floa�in wetland is unid'uectional on a slope,�vater is not impounded in ihe wetland '`i�to—go to 6 Yes—Slope 6) Wetland is located in a topographic valley w�h stream or river ia the middie `�To—go to 9 Yes—go to 7 � Have data showing azea flooded mo=e than once every 2 yzs.;or indicators of floo�ng aze present � ❑ Scour masks common II ❑ Recent sediment deposition ❑ Vegetation thatis damaged or bent in one direction ❑ SoiL have altemating depo-�ts ❑ Vegetation alongbank edge has ffood mzrks i "No for all indicators—go to 9 Yes for any indicator—go to 8 ; 8) Flood waters retained No—R.iverine Flow-through Yes—Riveri.ne Impoundiag I� ❑ Depression in floodplain ❑ Constricted oudet � ' ❑ PeLmanent watei 9) Has s-;irface wa:er outFlow De ressional Outflow � Has no suiface outElow—Depression ose , Iiatianal�for Cboicts(bured on bt.ct availabk i�rform.�ar.-wbat can&tetn or�rviou.rfy knamr.infarmation about tbr mttland r�rtem�: zo 'V4'etland Functions Field Data Form-'V4%SDOT's BPJ Characterization * ` �' L Project: ��.,cS2..,1�'�- _ Date: "l dS O(� VS'etland Name: � Biologist: ��S�C-� A. Flood Flo��Alteration Likely or not likely to pro��de_ (Storage and Desynchronization) (State your rationale.) 1. W�tland ocMcu�,rslAin J�i�up�r porhon of its watershed ��`U fip �,f a�� e`j -- �.�,,.v, (.� to.:��(s.c,�,� J �"" ' i�� 2. YJetland is in a relatively flat area and�s capable of ��.` , retaining higher voiumes of water� sto�even#s, . than under norma]rzinfall nditions. ��L�S � �. D��ess��s �-�� °� ��.,�i �� A ��es 3. Wetland is a closed{depressio�l)syste�.� C�,. �a � Wa-�C..►' l� '!J�- 4. If flowthrou�h,wetland has constricted�utlet w-ith signs of �,al Gr��41 p f '��+"{- �Z-- fluctuafin$water levels,algal mats,and/or lodjed debris.�e5' �\_ ,u�� ,� �Q �("�.SS��+'�.. (�•(,- �U 1.1�._ ��f}- 5. Wetland has dease w�fldy vegrta�on. f�C�.��°.S T''�� p � 1�.,'t'�',r�.� �S't?e�- A-*� b. Wetland receives flo�dwater from 2n adjaceat water coT.usek � \ � �o�„s.`�,n,_ �� I v�. �,��-' 7. Fi��dwaters come as sheet flow rather than channel flow,x C�'��`�u-�- S �=� � ��°'S�� B, Sediment Removal Likel��or not likely to p:o��ide. (State yol:r rationale.) 1. 3ources of excess sediment(from tillage or cons::ucti�n; � pr�,,j�� - �1•1 H �e resent u ��e�n�t of the wetland ✓ �'�e'" � \ � � P �5� S V PX�N'��Cr;S �s��..'�i � �' � ' � (�,ve(� �Q.'f'�CA..i�� (..t�.�f�+r 2. Slow movi.ng wat r and�'or a d�.�epRrater habitat are present �/ '��,�F (�✓i�C '� { in tne wetland. e-,S -- wct�'�ru' �(ae-� h bfi` f �-p CE�i" � �s, rv.�� ; t� �a-��. C�-L syst-��-�- c�<<��v S d�� s� 3. Dense he aceons vegetation is present �(Q.S � ,�. ��-, ��'��-�� 'S��?o � 4�-. 6 j��b. ve.r� �� s. �e-�-�-;� � c� 4. Interspersi�n of vegeta�on and water is�gh in wetland. I ti � �Er�e� `y'd S w c_ �-.,p -f-�-V ` I ��- ��1''�v`T'.- 5. Ponding of water occurs in the wetlznd �S �e.�os�t+� v�s b�� 6. Sediment deposits 2re presen:in wetlaad �.�� '' Adapted frflm the Highwa3�Metiiodology Workbook Suppiement for Wet�a.zc Functions and Values(COE,i995). z7 C. Tutrient and Tozicant Removal Likely or not likely to provide. 1. Sources of excess nutrients (fertilizers)and tox.icants (State your rationaie.) (pesucides and heaty metals)are present upgradient of I '��` � r o-v�c�� the wetland. �� (,�.�['��,��c,+'�' �,�;, f v� (� � �. r z. we�a�5�undated or has indicators that floo:ing is a �� C�� u� ��t� seasonal event dur�ng the g�owing season. �E � V`U�''ri��S /�'�`�CCs--�.S �a �ODv�,a -�d S�P �'�'�-!�"�• i�c:l 3. Vdetland pro��ides long duration for water detentioa.�eS ,� �,a,�� ,SD�.S ��' �� S ' 4. Wetland has at least 30%areal cover of live dense (l�, .�- �o�i� � �_� ,�1 "��"_�� t 01�� herbaceous vegeta`.ion. �F�j �G� . I`�vic,f;� CJ�'YN�'�Cs�1 I��> 1 � I 5. Fine-grained minerzl or orgaaic soils are present in V.USor'�{-►sr�- ��-5�-\H�`� �l� � the wetland.�j QS �r��-FS C��'�`l '�Gt,'�1 �''\ f D. Erosion Control and Shoreline Stabilization L�ely o:not likely to provide. (State your rationale.) If associated with waier course or shoreline. , , ��-�- 1. Wet�and has dense, energy abso�ing vegetation�r�ring / the water course and no eYidence of er�sion. �`�,�— ��p� - L� r�� 2. A herbaceous layer is part of this dense vege��atioa. ��'�Q-� C�� 3. Trees and s�rubs able to withstand erosive fl�od events a.�e also p��t of this dense vegetation. E. Production of Organic Matter and its Eaport Liicely or no:li.keIy to provide. (Sra*.e your rationale.) 1. VJetland has at leasi 30%areal cover of dense herbaceous j ��`� .� �Y'�ti'l C��; vegetation. �� l�'� � �Ey��;�e�,� '�c��_c4�v��J 2. Wo�dy plants in wetland are mostly dec��duow. 'j F% �G�HC� �e �s�-�- �� c�.�.� � � 3. High de�ee ofplant;am�unity structure,vegetz�on ,y ��-}-- density, and s�cies richness presen� .��',��'=�: `;.�- L (� '`�i r�:v*�`�.� �S � �� ' � Cjs�ti �� 4. Interspersion of vegeiation and water is high in wetland.��S �''��`�'� t ��--Qr/ -f-c� �f��_.s� C� 5. Wefland is inundated or has indicators that fl��g is a seasonal event during the growing season_y Es ,,t p W,n�Y��{;�,�' v� b. �4'etland has outiet from whi.;h organic mati�:is flwhed. ��j�"S V�S � Adaptpd from�.e F--�i�:;�-a;-'�4e��odolog>-Vr'.�rK��:5::��i:�en:f�r��,'etland Fun`-`io�c z:�d �%aiues(COE,1995;. � F. General Habitat Suitabiliiy L�ely or not likely to provide. (State your rationale.) l. _etland is not fra�ent�d by develo ment. l��S� - ` �p.� (�,,�1 — �r hvf�-5��,Y�w�.�fY -�2.h�-l� �-1�-�\ � � R, 2, ��pland surrounding we�land is undeveloped.�� p. \s ��kd,,-4--�`�'''�--� � �� ..Mot !- - 3. Wetland has connecti��ity with other habiiat types.�� ,�� `S�-�}(b�(� � y�`-S 4. Diversit�r of plant species is high.y�S �Ut,()��'`�1�•' �6��"��, �� II ��,� . -�I�u�-�1 � 5. Vti;e�d has re thaL one Cowardin Class,i.e., (�'FO S�..../ PAB,POW,etc.) .,� � d� � 0� �� ,� '1 ��f� � � .��'�..��..C%. 5. Has hi�de�ee of Cowardin Class interspe:sion.N� d��" �-�. s��. 7. Evidence of wildlife use,e.g.,tracks, scat,g�awed s��s,etc.,is present N� G. Habitat for Aquatic Invertebrates Likely or nof likely to provide. (State y�ur ratio�ale.) . l. Wetland must have permanent or evidence f �n?1 �\,„ �L -`—o �Y�-��`�- ` inundation for this func#i�n to be provided.�� K-��' � �;�� "��,�� s 2. Various waier dep�hs present in wetla_nd �� `j��O�.j-S l�� .5� �— �. Aquatic bed vegeta�on present.�� p��..�ti/1,� , J�`~`�`"�-'` �y�`r �_,�, � �-r".�C��r� 4. Energent vegetation preseat within ponded area.�� l�� 1� („�!� ��. �, C)e�rl J/ 5. Cover(i.e.,woody debris,rocks,and leaf litt�er) �� -J p�Q�+-r-�-- present R:thin in the standing water area. �es �Y�-�� v�� 1��``��-�fc�.'K- 6. g stream or an�ther wetland within 2 km 1.2 mi � � ) -�}� C_�`� ..�. of wetland.� �� I -` H. Habitat for Amphibians Likely or not likely to provide. (State your ra�ionale.) 1. �G'etland contains areas of seasonal and;`or ermznen� -4�, � �;e �— standiag water in most years. (Mast be pre�nt ��--�� V` f fDr this function to be provided) �e� '��Gl. �:S -��Lt'�{6� � 2. �in-stemmed emergent and�or floatin�acuatic C��r��r'�S�'1 C� � �� vegeta�on present within areas of seasonal and/or ��,,y�_ perenn:�1 sianding water.�(�.,� S�,/�{'Y � (, �...- 4 �pVG� t�� d�� 3. �'etlanc�bz:.ffer<4Qt/o developed,i.e_,by pave�nt ��"' i� ��G �.�/y� anc'or bvilciin s. �t_ �'d��:�`�'� � �+ +� � ��`� i;` tCt.4 t�'u. i Y :�.�'a t�R ��.. '�N��.! " Ada��c frcm#i-ee�Lghvray Methodol��Worl�a�ok Supplemer_i foi Yveiiand rur��o=v ar.c V"a�ues{�..G��.,1��). 23 4. VJoody debris present R�ithin wetland. �QS Like:y or not likely to provide. 5. Lands a�ithi.n 1 km(0.6 mi)of wetland are gzeater ' (State your rati�nale.) than or equal to 40%undeveloped(e.g.,green belts, _ - - forest,grassland, agriculiural). �� 6. O�h.er wetlands and/or an intermittEnt or�eIrennial stream��ithin 11�(0.6 mi)of wetland. �!�'.`� i L Habitat for R'efland-Assor.iated Mammals Likely o:not likely to provide. (State y�ur rationale.) 1. Permanent water present within the wetland. (Must be present for this funcuon to be pro�2ded.) y�� / �u�� 1 � , 2. Presence of emergent vegetatron m areas of peimanent water. ��r��.�- �-p 3. Areas containing dense shrubs and/or trees are ��-�_ present within wetland or its bnffer. � 5 ��'j� 4. Interspersion between diiferent strata ofvegetation. ��G1�,� �', lIt a�l.— 5. Interspersion between permanent open water �`�"`�`'"u-� G`-�� (without vegetation)and per,�anent water with � '�,�'�t,� vege�ation. ��'--�N`��-,� J � �� -�t�°�.c.�, 6. Presence of banks suitable for denning. 7. Bvidence of wildlife use,e.g.,dens,tracks, scat, gnawed s�umps,etc.,is present. J. Habitat for R'etland-Associated Birds Likely or not likely to provide. i. Wetla.nd has 30 to 50%shaL��w open water and/or (5tate your rationale.) aqnatic bed classes present R�ithin fne wetland. � �.��1� �C° ��a t��' - � J ��,�.. 2. Emergeat vegeta+�on class present wzthin the�et;and. QS ��`�� c�� S s S� 3. Fore�tPd and scrub-shrub classes present wit�in V� � � � ..d t the wetland or its buffer. �� S r vtG�` r ��!'-�u-e`�.- , /' �G� pT �� J1 11 4. Snags present in we*land or its buffer. �'�� `„/, �� ,�i��, � TJ�-�- 5. Sand bars and/or mud fl�*s presen:w�,thia the � � C.i"tjy�� wetland. �}J C`-Ivt �n,�l., ��W� I - `�'l�',S ��- , "Ada�tec trom the��g�vva5'2«eiiiodo?o�-iti'ark'x�oic Sappi<.m�,:`o.�'etland F:inctiflti and Values(COE,i995;. 24 6. VJetland contain mvzrtebrate a phibians andlor fish. L�.cely o:not likely to provide. {State your rationale.) 7, Buffer contains relatively undisturbed grassland shrub and/or forest habita�s. '��5� S°N'''Q'�'`}4`� 8, Lands zvithi.n 1 1�(0.6 mi) of the wetland are greater than or equal to 40%undeveloped(e.g.,green belts, foresi,grassland,agicultural). �� K General Fish Habitat Like1yo ur not likely to provide. (Must be associated with a fish-bearing water.) (State yot�rationale.) 1. VJetlznd has a perennial or intermittent surface-water � 1 connection to a fish-bearing water body 4 v � '� , t 2. Wetland has sufficient size and depth of open water ! so as not to freeze completely dluing wiuter. �'" Q.�S d�` �� 3. Observation of fish. �t� � ��.Y��l. L�� -> � � 4. Herbaceous and/or woody vegeation is present in � (,1��'-'}'q�� wetland and/or buffer to provide cover,shade;and/or � '- �` J detrital�a�ter. � ��L.�,/��,1✓� � 5. Spawning areas�e present(aquatic vegetati�n and/or gravelbedsj. L. Native Plant Richness L�7cely or not 3ikely to provide. I �` (Sta+�e your ratio e.j 1. Dominant and codoninant plants are native. �S (�1 K-Q� � �Y o-�`�- " 11 � ` k s D/=F-' �I 2. VJefland contains two or more Cowardin Classes. ' u� ��`s � P ��J s �j�,� (��,�,�,w,,�-►�.i�-t eS 3. Wetlaad has three or more strata of vegetation. \/,�S { �Q,� � �� . 4. Wetland has mature trees. �C7 M. Educational or Scientific Valne Likely or not li�ely to provide. � {State your raaonale.) 1. Site has documented scientific or educationa�use. �V-o �� 1 _� ` � 2. �Gefland is in pnblic ovs�nership. �� S��- � � � 3. Parking at site is suitabl�for a schooi bL.s. PJ o '��I C� (�l•J/��s Yu� , { '� F �; �u ; �-. -, - � ��:- �� - Ad��tFd t-o��t��_H:�..h�ay�2�4 .odo_co. Y�`o.}:boa�:�urpl�e:�t ro_�Jz:�-�� .ln_.�o� ar.c Vaiva=_ (COE,199�j. 25 N. Uniqneness and Heritage Likely or not likely to provide. l. R'etland contains documented occurrence of a state—A (State your rationale.) or federally listed threatened or endangered species.IVU �f=C'i�� " 2. Vi'etland contains documented c�itical habiiat;high � � quality ecosystems,or priority species respectively ��-�(�,�� designated by the U.S.Fish and V4'ildlife Senlce, � the VJDNR's Natural Heritage Program,or �� .�r��-�� Vr�FR''s Priority Habitats and Species Prog-am 3. V�'etland is part of a ATational Natura�Landmark V�`-.'��'�� . desi�ated by the National Park Service or a �fl �� . ��`jQ� Natural Heritage Site desigpated by V4'DNR N l� � �- �,a c_v�`��. 4. VJetland has biological;geoiogicai,or o#her features �� that are determined rare by the Iocal juri.sdiction. N�� 5. V��etland h2.c been determined significant by the S'�,4��V'� S�� - local jul-�:sdicuon becaus�it provides functions ' scarce for the area. N�� 6. G�''eflZnd is part flf... ➢ an estuary, ➢ a bog, � D a mature iorest. *A3ap`�u fro�tne Highway Methodolog�-Vs'orkbook Suppleaient fo�Wet:a,-ic F�nc�o�s e.-�3 Values(COE;1995;. � 7 ! 19 g.ey to HGM D�etland Classificatiori: Washirigton V�'etland Type Wetland I�Tame: �V...��,� � Date: �l� �/\��(-- • - 1/a�/Q{{j 1) Water levels in wetland usually controIled by tides `�6"—go to 2 Yes—Tidal Fringe 2) Topo�aphy is flat and precipitationis on�y source (>90%)of mater to the we'land �—go to 3 Yes—Flat 3j Wet�nd is contiguous wirh> 8 ha (19.8 ac)open watet,and wate:i decper than 2 m(6.6 ft)oves 30%of op en mates area `�No—go to 4 Yes—Lacustdne Fringe 4) Open water is<$ha(19,g ac) and>2 m(6.6 ft) deep,but wetland is a fring�e naaower than 1/z the tadius of op cn watet ✓No—go to 5 Yes—Lacustrine Fri.nge 5) Water flo�r in wetland is uniduectional on a slope,water' unded in the wetland No—go to 6 Yes—51ope 6) Wetland i located in a topog�aphic valley�w�stream or�ver in the middle �o—go to 9 Yes—go to ? '� Have data shoa�ng uca flooded moze tbaa once evcr 2 prs.;or inaicators of flooding ase prescnt � ❑ Scour marks comaion ❑ Recent sediment depo�ition ❑ Vegetation that is damaged or bent in one di:ection ❑ Soils have alternating deposits ❑ Vegetati�n alongbank edge has flood marks No for all indic-atois—go to 9 Yes for any indicator—go to 8 8) F1ood�aters setaincd No—Riverine Flow-through Yes—Ris eri.ne Impounding ❑ Dep=ession in floo�lain ❑ Constricted outlet � ❑ PCrmanGIIt Wd�i 9) Has s�ace wa*er outflo�—Depiessional Outflow Izas no suLface outflow—Depressional Closed P.�innc!far Cboiat(based on bett av�bk infonn�tior-wbat car.be reer.arpnvioxr��knoryn ir.fv�m�lion aboui t6t weTland�rtnn): zo V4'etland �unctions Field Data Form—R'SDOT's BPJ Characterization '` Project: C�X — l� C, C� _ Date: �'�/�� VVetland Name: �/��'� � Biol�gist: �.��--�^�--i��.�`�� A. Flood�'low Alteration Likely�r not likely to provide. (Storage and Desynchronizaiion) (State yovr ratioaa'_e.) 1. V4%etland occurs in the uppe:portion of its watershed � V1�P..`� V�� -b 1 - 2. Wetland is in a relatively flat area and is capable of ��%l�e- � retaining hi�er voiimmes of wz�r during stoffi events, , �� }--` than�nder normal r�.:�fall conditions. �f p ,S l9�� lJ•y"� \G�.��;, 3. V+'etand is a closed{depressiona?)sys��. �p ��.-. ��-�,��-�- , . 4. If flowthrou�,wEtland h�s constricted outlet with si�s of �,./r �`,"'l�'- (��Jl''�"Y fluc�ti�water le�els,alga'mats;a�d/or la�ed debris. � 5. Wefland has dense w��dy vegeia�on. N� � . b. Wetland receives fl�odwater from�a adj aceni watei coure. N� 7. Fl�odwaters c�me as shmt�ow rzther than chann�l flow. B. Sediment Remo�al L�kely or not likel}�ie provide. (State your ra�onale.) 1. Sources of excess sedinent(fro�tilla.ge or construcu�nl �� 1�a;� � are present upgradient of the weiland.�,�i S Y l 2. 51ow�o��ing wate;and/or a deepwai.er habiat are present � ✓'t�c�-2- ` in tue wetlan�. �� ,�_. ��-°�Ch}'�� (�_'�'� �Q'1� 3. Dense herbaceous vegeta'�oa is present 1" � --�-�1 ��,Q U,) �G`� ��`� I I " �.�- I 4. I n t�r s p e�s i o n o f v e g e t��o n a�d w a t e r u�i g�i*�w e t l a n 3�� '�L l � Q��-�_ r3t�� . �oading of wa�.er occu..�in tt3e wetlaad�o ��l/� �� k�.0`tSJv 6. Seci�.�ea:de�si's�e p-ea.na ir:we�laa��p i v'�'J ` "Adapt�3 fror-t tze I-�.igh�-a,�?vie��olo�_�•�3:i:ta��:Sup�1=-��..:07�ti e�.d=i:-.uoz z-�u Vzlues(�rJ�,19��1. z� C. Nutrient and To�cant Removal Likely or not likely to provide. 1. Sources of excess nutrients(fe:tilizers)and toxicants (State your rationaie.) (pesticides and heavy metals)are present upgradient of / '�� the wetland. �� ,�-a-,,�� ". ��-�-.�..►�� 2. VJetland is inundated or has indicators that fiooding is a � � seasona]event during the grouzng season. ��'''�.�" �� _ 3. O4'etland rovides loa�durahon for water detention. S��5 `—� P .. �� ,�� +/Lv�'►'1 / 4. Weland has at least 30%zreal cover of live dense ' / ��, t�,� • I.� � o�g herbaceous vege#ation. S. Fine-�ai.ned minera?or organic so�ls are present in `-� � JO��S � the wetland. � o�.c�.5a{� � . . D. Erosion Contro] and Shoreli.ne Stabilization � L�ely or not iikeiy to provide_ (State your raiionale.) If associated with water crnrrse or shoreline. /� i. VJetland has derse enerw absorbinQ veQeta�an bor(�pT�t�7p � � tr O b �""S tbe water cAurse and no evidence of er�sion. n1� �SS�L � I ` 2. A herbaceous laye:s part of this dense vege�ation. r , 1 / ' , >�, ,l.. ,�� lJv� U�.v�.� 3. Trees and s�.-ubs able to wi��-tand erosive flood even:s � ere also part of this dense vegetation. E. Production of Organi�Matter and its E�port Lilcely or not likely t�provide. (State yo�rationaie.) 1. Wetland has a#leas�t 30%areal cover of dense he:�aceous s vegetahon. N� � � p'�C,(9�C�1� S� V'Q.- • 2. VJo�dy plants in wefland are mostly deciduous. ,e S '��9 il (� �O+` Y 3. Hi�deg�ee ofplant community structure,vegetation N4 � �'�(T�'� 1� �'� density,and species rchaess present �S � S �✓''�'t�C� 4. Interspersion of vegetario�and water is h��in we�.t�nd�p r �j�� 0 �X - � 5. Wetland is mundated or has mdicat�:s t'rat flooding�s a�Q( seasonal event during th�gzowing sezso�. •� �`��r�� 6. VJe�land has oatiet�i07Il Rrhich flrganic mztt„r is#lushed. �J +'�-�,� � � �� " Atlzpted from the�ii�'��-ay Me�tod�loa��1�orkx,c K S::ppi.��-��far V��et]�s�d F-�n�a��enc Values{C0�,19�?�,. � F. General Habitat Snitabilii}� L�ely or not].ikely to provide. � {State your rationale.) 1. �4'etland is not gmented by development. �S t �� `C'�' �r �,v�e,tiei;,e,,r �e,u,(,,,,, �,�i ,(�` �-a Y 6�v 2. Upland surrounding wetland is uudeveloped.�eS � �t-�ar.,�t �-� (Q,';Il� � ,�6'►��i 3. We t 1 a n d h a s connec hvi t y vs2 t h o t her h a bi t a t t y pe s.�.� � � � 4. Diversity of plant sp�cies is hi�_Ct�� ,� ��.� .0 �-{`��/ ��Q �- � -�„� 5. Vdetlznd has more than one Cowardin Class,i.e., ��`�`s ��<' �y,� (PFO,PSS,PEh�,PAB,POW,etc.j�`�O ��. �j c.�fi- �� (s � `" `�" 6. H a s h i g h d e g e e o f C o w a r d i n C l a s s i n t e r s p e r s i o n.� � �� C1�-t:p�, � r p . �t� �" , � �'�j�� S �'� S`� � 7. Evidence of wildlife use,e.g.,tracks,scat,gnawed r�.��;,+ ��%S� ��t ' stumps,etc.,is present f 1,10 C G. Habitat for Aquatic Invertebra#es L�kely or not 1ticely to pro�ide. (Stzte your rationale.) 1. Wetand must 3�ave pem�nent or ez�idence of seasonal iuundstion for this fun�tion to be pro�zded. ;,p � �. r� 2. Various water depths present in�s�etland �� 3. Aquatic bed vege+�a+�on present. � 4 �� -�� t�._ �� , 4, Emergent vegetation present within ponded ate�. , � !'�-ES�.l�..� g�'►^�; l'� S. Cover(i.e.,woody debris,rocks,and leaf litter) present within in the standing water area. C,�. �� ' 6. A stream or another wetland within 21�(1.2 m;) of wetland H. Habitat for Amphibians L�cely or not likely to provide. (State yo�ra�ionale.) 1. Wetland con#ains areas of seasonal and/or permanen: ��t ��, .�..�y stand',ng water in most years. (Must be present � � for this function to be p_ovided)� ��Gk ` ��" �6`3�� 2. �'hin-stemmed emergent and�or floati�a �a tic �i ��• �� veg�tation present within areas of seasonal and/or ��t � j,,,� perennial standing water. �j� ��} ��y��✓ �"" F" '�-... ` �� v.y 3. VJetlan�buffe:<40%develapec,i.e.,b}�pavemen� ! `` �� - �0�� and!or bui.ldisgs�� {�4� !�.4't�i.�$�S ��-�"t p�,.. , '�Adanted�om#�e I-��rez Ivie�odol�gy�YYoik�ook Sup�lemen:foi Yr'e;la�-id Fun�ao_-is ar�e Vaines{COE,1995). i 23 4. V�'oody debris present withi.n wetland�-e S Lik.ely or not Iikely to provide. 5. Lands wit�un 1 lan(0.6 mi)of wetland are greater (State your rati�nale.) than or equal to 40%undeveloped(e.g.,green belts, foresf,gassland,a�icultural). N� 6. Other wetlands and/or an intermittsnt or perennial s�eam within 1 lan(0.6 mi)of wetland. �p L Habitat for R'etland.�ssociated Mammals Likely or not likely to provide. (Sta.te your rationale.� 1. Permanen:water present w�;hin the wet]and. (Must be present for this function to be provided.) Y v� / � f � � 2. Presence of emergent vegetation in areas of �� eimanent water. �� ,�� 3. Areas contzini.ng dense shrubs and/or trees are present withi.n wetland or its buffer. �� r��" 4. Inters�ersion between d�ferenf strat2 of vegetation. �. Interspe�ion between permanent open water (wzthout vegetahon)and permanent water with vege+�ation. 6. Presence of banks suitable for denning. ! 7. Evidence of w3ldlife use, e.g.,dens,tacks,scat, gnawed stumps,etc.,is nresent. J. Habitat for R'efland:Associated Birds I L�1cely or not 1�1tely to provide. 1. Wetland has 30 to 50%shallow open R�ater and/o (5tate yo�,u rati�nale.) aquatic bed classes present within fne we+land. �,b �k,��y Vlp-�-- �^.��4�"i�Q�, J � 2. Emergent vegetation class present within the wetland.N� ��:� �C'�C��-S G�.� 3. Forested and scrub-shrub classes present RZthin J'u� ��1� �� " Y�� the wetland or its bu$er. �5 ��,� �,Q,[�,( � -� � �'� 1 4. Snags present in wetland or its buffer,� �,j��(�.,v� ` (�.�,� bC - ��' 5, Sand bars and/o:mud flats present within the S�Y�(`��, jM'�� US� • wetland. � } � ��' """`� . r � '�Adap�d from t3;e High�-a;-3�?=*hodolo��iNorlcbo�ic Su�plenent#or iNe�d Functit��ns and Values(COE,1995). 24 6. Wetland contains i.nvertebrates,amphibians, Likely or not likely to provide. ��or fi�.�i/ � ts+��yo��tio��.� 7, Buffer coniains relatively undisturbed grassland shrub andlor forest habitafs.��+�-?-��°'�-S �� t-o r �.�r� �.��,.;.�.�.S t�rb-c.d' J 8. Lands within 1 �n(0.6 mi)of the wetland are geater than or equal to 40%undeveloped(e.g.,green bel+s, forest,�assland,agricultural). �v K. General Fish Habitat Likely or not likely to provide. (Must be associated with a.fsh-bearing water.) (State your raiionale.) 1. Wetland has a perennial or intermittent su.�ace-water �, ` connection to a fish-bearing water body (v ' 2. V4'e*land has su�cient size and depth of open water ` L��L� �� so as not to freeze completely dising winter. �`� ' 3. Observa*�on of fish. i�'�Cj�a��Gl�`�C� (��CJ� �Y g P �S� � �C�� 4�� 4. Herba,:.eoi:s andlor w�o ve eration is resent in wetland and,�or b�.i$er to provide cover,shade,and/or ��`-��j..t,v�,,,r detr-ital ma.tter. 5. Spawning areas are present(aquaric vegetation and/or gravei beds). L. Nah��e Plant Richness L�lcely or not likely to provide. (Sta+.�your rationale.) 1. Dom?nant and codominant plants are native. �C'_ S �.��'�,G�- �� b fi- -�--p �Y`"�t./tC� 2. Vr'efland contains two or more Cowardin Classes. �Q� t�C.. 1��; �� y�`�' �� }-'�+�"�G� � �s v [�a��'��- 3. wetland�as#hree or more strata of vegetaaon. �� ` 1 � �� i Y'uZ.�tJ� 4�� o S�S --� 4, VrTetland has matsre trees. � � , � (�.�-f' ,5�� r t-�iV�.�S�.._ �,�1`-S - V M. Educational or Scientific Value Likely or not likely to provi e. (State yoLr rationale.) 1. Site has d�cumented s�ien�fic or educa�onal use. � C� /�,, _S�� 0� 8T �.Vl_ � 2. VJetland is in pub�ic oanership. �'�.� � . (;�:�� ylafi t� 3. Parking at site is suitabie for a schooi bus. �p � �� , �tJ� l�i �`i��-�'+'U�S�' � � ;�G3�IE�:'OL��1'c_'��iV:d�`�4��'16if.±D�-�F C��.JJ+�t'�:i:��.2'v'1P:i?:O: 1'4 E�'7..r'.1'ifi tL'Sl'1JP5 d=.� �c�12� ��,".,1:�% . 25 N. LTniqueness and Heritage Likely or not likely to provide. 1. Vt�etiand contains documented occurrence of a state— (State your rationzle.) or fede:ally listed threatened or endangered species. � � �' <<�� , ��,U _ 2. Werla�d contains documented critical habitat,hieh � ��.�'�"" J quality ecosystems,or prio:ity species respectively designated by the U.S.Fish and Wildlife Service, �''l `�* �- ��J��(iC�,�, the V�TD?vTR's Natural Heritage Program or �� VrTDFO4"s Priority Habitats and Species Program fJ17 � - � �..;��,� 3. Wetland is part of a National?�Tatural Landmark ` desi�ated by t�e National Park Service or a „` ,.. i Natural Heritage Site desi�ated by WDNR t,,}� +� .�� ' l,, 4. VJetl�nd has biological,geoiogical,or other features ` �t �� / �j„�,�1 � �U.�1 that are determined rare by the local jurisdiction.��D C. 5. Vi'etland has been determined significant by the �� .��,` local jurisdiction because it provides functions scarce for the area N j� _ � 5. Vr'etland is p�.�t of... � �`J'�-�� ' an estu�y, �Q ➢ a b�g, ➢ a mature forest. *Adap}�d 7om tile Highway 2vlethodologc Vti'orkbook Sapp:e�ert for Zti etia-�d FJnctio��an� Vaiues fCOE,1995). € I 19 I Bey to HGM Wetlarid Classification: Washington Wetland T�-pe IL' i � �`etland Name: C�L��'• -'��; �� Date: Sl� �!�$l� • `1 /��/C��O 1) Water levels in wetland usually conttoIled b j�tides ��to—go to 2 Yes—Tidal Fringe 2) Topo�raphp is flat and preapitationis only source (>90%)of water to the wetland vI'�i o—go to 3 Yes—Flat 3) Wetland is contiguous with> 8 ha(19.8 ac)open water,and water is deeper than 2 m(6.6 rtj oves 30%oF �o -zvates area No—go to 4 Yes—Lacustdne Fringe 4) Open�vater is <8 ha (19.8 ac)and>2 m(6.6 ft) deep,but we'land is a fiinge naao�er than'/z the radrss of �water I�To—go to 5 Yes—Lacustrine Fringe �) Wates flow in wetland is uniditectional on a slope,water is not i�pounded in the wetland '��To—go to 6 Yes—Slope � Wetland is locat�d in a topographic valley w-rth stream oz�vu in the middle �Ko—go to 9 Ycs—go to 7 '� Have data showing azea flooded more than once every 2�s.;or indicato=s of flooding are present ❑ Scour marl�common ❑ Recent sediment deposiuon ❑ Vegetation rhat is damaged or bent in one direction ❑ Soils have altemating c3eposits ❑ Vegetation alongbank edge has flood marhs C—'IhTo for all indicators—go to 9 Yes for an�indicator—go to 8 8) Flood waters retained No—Riverine F1ow-through Yes—R.iverine Impounding ❑ Depiession in floodplain ❑ Constricted outlet f ❑ Pe�anent wates 9} Has surface tvater outFlow—De iessional O ow Has no su�ace outIIow epressional Closed kvtionalr fnr Cboice�(barcd on 6et1 availablc ir.forma�on-wbat can be nen orpnvioruf�knawn infornration abord the wetland r.ystem): 20 Wetland Functions Field Data Form—'V4'SDOT's BPJ Characterization * Project: �I G,— `�� _ Date: • 1� 'V1St� • �aS/�C� Vi'etland Name: _ I J vQ�i�1[9.-V\(] � Biologist: � - �Q-�� A. �'iood Fiow Alteration Likely or not likely to provide. (Storage and Desynchronizason) {State your ra�onale.) 1. Vi'etland occurs in the upper portion of its watershe� `�`�S l�-1��-�� `�1 ��U� ' I 2. VJefland is in a rela�vely flat area and is capable of �"'�� '�� ret�'_'nin�hi�er voiumes of water during storm events, �v`. `{'�'�Q_ U� �'r�^ than under normal iai.nfall conditi�ns.�e S �� ,�n '^n ��" `''j/� -� �.,�� y�u� 3. Weflaad is a closed{depressional)system yE� C��G��Q 'QL� S+'� � 4. If flowthrough,wetland has constricted outlet with signs or ��d� �'�Sy��"��"� ' fluctuating water leveis,algal mats,and�or lo�ed debris. ��— ^ ��. �S au�-�; � IV 5. Wetland has dense w��dy vegefation. �2-S � (�p�,�/'CpU��s2— � � b, Wetland receives floodwater from an ad;acent water co-.�se. �� 90�-�`��'' �'��vt`�`#i 7. Fifl�dwa`�.ers c�me as sheet flow rathe:than channel flo�. �U,� v��-t- �ss1o� �- B. Sediment Removal L�kely or not like'_y to provide. � (State your ra�onale.) 1. Sources of excess sediment(from tillage or construc�i�n; are present upgradient of the wetland. Ye.S L,`,�-�-� � �� u�� 2. Slow moving w�ater and�or a c'ieepwater habiat are presei: ' �/UL�`�" �-C�'�- �� in the wefland�I�� ✓ � �"��" � (�-- . . " �� 3. Dense herbaceous vegetatron�s present��'S ��('�+�� S�-'� �� + ' .� n�-'� 6�1 ti��-� C D�U,M.h - � 4. 1nterspersion of vegetauon and wa�er�s lugh m wetland.y � �<��,+`t Lt� , �V� O+ ,S V } i 5. Ponding ofwate:oceurs in the we�land ��k S-e0,- �y r ,--,(� I �?.�; ;r:v�C� � 6. Secii�eni�iep,�sit�zre present in wetlan�. ��.�� Q1"� ' �� OCC��--- �, ,�, ��"�'""`�'"i �L� y � P � , r . _ Adapted fi��-.the Hig=v,-ar A�e�ia.:c1:.��,-Gr;o�kbo�k S�Y��es�ent for V.'e�.�d Fur��on: anc Valtt2s fCOE:i99�j. 21 C. Nutrient and Toxicant Removal Likely or not likely to provide. 1. Sources of excess nuuients(fertilizers)and toxicanu �(State your rationale.) (pesticides and h�metals)are present npgradient of I `�p � �.� �4 the wetland.V li��' �r pv i L�,�J .--. �j.�t� `�Yc�.� �11cJ�Yi�.G�..�� 2. V�'etland is inundated or has indicators tha:floo � g is�,, . � '��,,� �� seasonal event dunng the gzowing season.(� �S'`�-- -�-6�C� C-(2-:V� S / .SQG'1 W�-� 3�'" IG�L.�e� 3. V4'e`land provides long duration for wate.detention.N Q r��e✓�l►�a-�� 4. Wetland has ai least 30%areal cover of live dense � ,� �_ ��' herbaceoz:s vegetztion. !V p �'1�b- �y��. br"n�;.��c. �C.��..� ,�t:��S 5. Fine-�rr-ai.ned mineral or organic soiLs are present in 'J t the wetland_ �� I l.y�,,t;�j� "t�1,� f Wl Cfl `'�'"t_ D. Erosion Control and Shoreline Sfabiliza6on L�cely or not lilcely to proviae. (State your rationale.) If associated with water course or shoreline. . j � _ �� . Vdetland has dense,energy absorbing vegetation borderin; the water course and no evidence of erosion. ��. f� S��L, (�� iJ�- 2. A herbaceous layer is part of this dense vegetati�n. � 5�.-�� 6r�.�� 3. Trees and sb.Tubs able to withs+,and erosive flood events � are also part of this dense vegetauon. E. Producfion of Organic Matter and its Egport Lilcely or not Iikely to provide. (Sta:e your ra�onale.) 1. Wetland has at leas±30%areal cove:of dense he:�aceo� y vegeta�on. fs D �`��-j ��d 1 � / 2. VJoody pian�in we�land are mostly decidsous. �12 S r a'�l��,e �' � ��'F-"" 3. High degree o�plant ccmmtmity structu�e,vegetauoa J Q U�" � density, and species richness present � ..�S �(�s� D�t ��r�a-�ti.�C.. 4. Interspersion of vege�ati�n and wate:is hi�h in wetland.�, �;��.c�<� �,�'1�c�--'�"i��, 5. W etland is undated or has indicators that flooding is a seasonal event d;uing the gzowing season. ��.�+� / I 6. A�'etland has�:ulet fr��which organi:,ma�e:is flushed. � �� .�i4TdPt2�fT0�1�"':c_'''73�`V:c 1�i2'.�10u�1��j'4�'JI�'.�7��:SL'�"i�ic�le?'ii f3.'Z�1 2t::='i��FilT1,_'_,��nc Z.-i.� Valnes (CO�. lO°, 22 F. General Habitat Suitability L�ely or not lilLely to pro��ide_ , (State your rationale.) l. a'etland is no fr-a�nenied by development. �Q�� ! �x�e.��- �or �e�,,w.c�.� �en�.e, ��,Q� -�"a ��' •��°2. ` � 2. Upland sun-ounding wetland is undeveloped. N� � � �Q��(.,��1'� 1��.�-�1,.�2� 3. Wetlznd ha.s connectivi�y with other habitat type�.�,Q� u��s-��'�� "" 4. Di�*ersity of�lant species is hi�hh. y,�CS � C U�,�` �`�� f�r�� S 7 5. Vr'etland has e than one Cow�ardin Class,i.e., ��¢A�. S��- ��-- � �t,` �PS�PAB,POW,etc.) � ' 1^ _ '^ �� --� � C�� V\��-YJ 6. Has iugh degree of Cowardin Class interspersion N� � �.� �`t�5� f��' 7. Evidence of wildli.fe use,e.g.,tracks, scat,gnawed stumps,etc.,is preseni � G. Habitat for 4quafic InV ertebrates Likely or not likel5�to proizde. (S*zte yo�rationale.) l. �4'efland must have perma�ent or evidence of se ( inundation for this func#i�n to be provided. '� ��.Q`y � �� C�� 2. Various wa�r depths present in�retland�t� ��T ;��-�1 ��. ��6 � � � 3. Aquatic bed vege'�tion present.�� ' }��S"'" _` �� ` � 4. Emergent vegetation present within ponded area.�,.,�1� (�t�� '� � " � r v�c�;-- U�v';�v S �l-}C�'°`� ��-� 5. Gover(i.e.,woody debris,rocks,and leaf litter) presen.wZthin in the standing water area.�„�� ` �s �;;�r S 1�. �� _ ��,ti.��f � 6. A sti-eam or an�ther wetland v,�ithin 21an(12 mi) ��{�(/c�jt�.�`�-� ��,� ' of wetland'�( �� ,}. H. �abitat for Amphibians Likely or not likely to provide. I 'T (�tate your rationale.) 1. Wetland contaius areas of seasonal_and/or permanent I , ` ' standing water in most yea��. ust be present V�'��`Q'`J �� °t��/ � for this function to be pro`Zded) � ' �� .�- _ �v�,i;ti�r�.- � �-- 2. 'i'hin-stemmed emergent and/or floating aquatic ��S j}E{�� f�✓�.- L� � �` vegetation present within areas of seasonal and/or '(��"� C n,�,ti�, perennial standing water. � �'l� • �'�.�`'� � ��'y -". �/ � �� l� J 3. Wetland buffer<4C%devela i.e.,b avement ��,t S 1 v��-U1.�Q.S �� C.��. � P� Y P ; and,�or bli.ldings. �;� — ��^�-+4`�.��-�"`1 vE'�"'' I 1�,,,,�,,,: *�dap�c�om L'ne tiign�-e�-2s`_=_�oc�'_o�-L',or�.book Su��1=sz�:fo:�'��1�-�d tur��oz and �'al�es{C�E;19;�;. 23 4. VVoody debris present within wetland. ��-5 LikEly or not li�;ely to pro�zde. 5. Lands within 1 lan(O.b mi)of wetland are greater (Siate your rationale.) than or equal to 40%undevelope�}(��.,green belts, forest,grassland,agriculiural). �� r--� b. Other wetlands and,ior an intermittent or perennial stream within i 1�(0.6 mi)of wetland. �-� �.�--�-. , I. Habitat for V4'efland_Associated Mammals Likely or not likely to provide. (State your rationale.) 1. Permanent water present wiihin the wetland. (Must be present for this function to be provided.) .�'- � �' . 2. Presence of emergent vegetauon in arezs of permanent water. O , n � - �r� 3. Areas containi.ng dense shrubs and/or trees zre present within wetland�r its buffer. �� l lJ' 4. Inters�rsion betu�een dii'�erent s�ata of ve�e�iation. 5. Interspe:si�n be�veen pe�manent open water (a7thout vegetation)and pe-manent water w7th vegetation. 6. Presence of banks suitable for denning. 7. Evidence of wildlife use,e.g.,dens,tra�ks,scat, gnawed stumps,etc.,is present. J. Habitat for Wefland-Associated$irds Likely�r not l�cely to provid�. �5'�ctE yQlLT I3t..'OSLB.��.� � i. Vr'efland has 30 to 50%shaLow open water and/or ( aquatic bed classes present within the wetland.� L��\� ��i c�-�— � �r°v� Q 2. Emergent yeget.a*�on class present within the wetland. �� l�� (,,� Z�T— � - I 3. Fores*,.ed and scrub-shr�b classes present wi�in � �Q r��-� (i"� the wetland�r its bLffer. ` � `��S 4��- s-r�u�+�-�� i�- 4. Snags present in wefland or its buffer.�n� G� ��f�- `��,,,� ' 5. Sand b�and�or mud flat�present v,n�#hia the � `".}_. wetland. `,� �'� sS?%C(U�-z E C�, �U.�'��,�t.:�.� : � ' J , �`1 i � SC •� ' hcap�d from the I-io�i�ar T�?e�3c�loa-V,'orx�a�k Sup::�=n�fo:�',��-.�_-�c:u=�c+3��anc Values(CO�,-i9°5;. 24 6. Vi'etland contains invenebrates,ampbibians, and/or fish. ` Likely or not likely to provide. N�� (State yovr rationale.) 7, Buffer contains relatively undisturbed grassland shrub andr`or forest habitats.�� 8. Lands wz#hin 1 bzn(0.6 mi) of the wetland are greater thau or equal to 40%undeveloped(e.g.,�een belts, , forest,grassland,agricuitural). �,� ' K. General Fish Habitat Likely or not likely to provide. (Must be associated with a f�.sh-bearing water.) (State your rationale.) ' 1. Wetland has a perennial or inteimittent surface-wates connection to a fish bearing water b�dy ; � I "� ,' 2. Wetland has sufncient size and depth of open water so as not to freeze compleiely dlmng zvinter. (�,,� ; � �� r��6C� ' 3. Observahon of fish. � I,�_ I �� G�._ � S�"�J�-��;.�c< 4. He-aaceous and/or woody vegeta�on is present in v � wetland and,�or buffer to p:ovide cover,shade,and/or p �� detrital matter. �� '�;LiV 5. Spawn�ng areas are pr-.sent(aquatic vegetati�n and/or gravel beds). L. Native Plant Richness L�cely or not likely to proi3de. (State your ra�onale.) 1. Dominant and codoninant plants are native.�2S ��P�� ar a v1 ��F �. ! l 2. VJetland contains two or more Cowardin Classes.�-�� ,1�0,�-�;�C�..�i ((�Y 11�� y 1 ( 3. R'eland has three or more strata of vegeta�on. �2_f C'� � !�� 1 S ��'� � y 4. 4Vetland 31as mature trees. �� s.��- ve�. c�-`-`�,`''�-� ' /� t �. ,�y1G��L � Vl Q P VQl. M. Educational or Scientific�'slue Likely or not likely o provide. (State yonr rationale.) 1. Site has documented scientific or educational use. � � 2. V�'etlane is in public oa�ership. � t � � � - �,,�JE�� -4�-C' �-�— �Il�_� G . 3. Pa.*�ng at site is suitable for a school bus. , � 1 U��.� �r�l i * A�p�d from#�e I�.ig'�ti*ey Metio�ology Vvor}:�a�k SLpp:=�er�t ro=b'i ef3an��:i.zc;_�� .d . t�l;,o; rCOE,1��,:j. 25 1�'. Lniqneness and Heritage Likely or not likely to provide. 1. VJetland contains documented occurrence of a state— (State your rationale.) or federally listed threatened or endangered species.�l� 2. VJetland contains documented critical habitat,high � quality ecosystems,or priority species respectively � � designated by the U.S.Fish and Wildlife Service, � the VJDh'R's Natural Heritage Program,or � A` ` VJDFoi''s Priority Habitats and Species Progzam. � ��V�� `�-� �d� � �� ,�.�}--�f cPC� � ' 3. Wetland is part o{a National Natural Landmark �4�V�-t�u � designated by the National Park Service or a � Natural Heritage Site designated by VJDNR�f� � ,�� '`U��,�'-� . v 4. Wefland has biological,geoiogical,or other features .}- �vQ{l(1"��- that are determined rare by the iocal jurisdiction. �/� j� l7 e�_��--1 �` 5. VJetiand has been determined significant by the ��e,�_ �j t/�,. , � local jtnsdic�on becaue it provides funcuons scarce for the area. (�� /� �O V�'�--� , .� J , 6. Vt'efland is pa*t of... ➢ an estuary, � ; ➢ a bog, I V� ➢ a matz:re forest � :.GdY�.G i:Ovl�l� 'i��':iN'c?'?.i2�i�TiD�O1C�C i��1�'f.'✓J^�'.�:1D71=.':z.`.tJ_T 4'1 et:."cSl:::L1��=�c:�.'�i �d�ll?5 ��Di;1�'l:'�j. ' ' APPENDIX D \�'Tl(�l� (11ruh�� ?(1(1-11 «�rtland R.itii�,� f��i�rn� Wetland name or number�� I V��TLAND RATL'�'G FORM—V��ESTER'�1 VVASHINGTON �� g J�e�� Version 2-Updated July 2006 w increase accuracy and reproducibility among users ��Ar Name of wetland (if known): '��`�'►P�.{ �,✓��0�+1�.. �"�� Date of site visit�/�'��b Rated by � �0-��S� Trained by Ecology? Yes'✓No_ Date of training o��-� � SEC: 1,�TWNSHP�3 RNGE:� Is S/T/R in Appendix D? Yes_ No✓ Map of wetland unit: Figure� Estimated size �1 � I � �'�� S� SUMMARY OF RATING �I Category based on FIJNCT�IONS provided by vvetland I II III '� IV � Score for Water Quality Functions a� Category I= Score>=70 Category II=Score 51-69 Score for Hydrologic Functions (p Category III= Score 30-50 Score for Habitat Functions � Cate�ory N= Score< 30 TOTAL score for Functions !.� Category based on SPECIAL CHARACTERISTICS of wetland . I II Does not Apply Final Category (�hoose the "highest" category from above) � Summary of basic information about the wetland unit �'G'etland LToit has Special . �� «'etland HG'1�I Class � Characteristics used for Ratina Estuarine De ressional �� Natural HeritaQe VVetland Ri��erine Bo Lak�frin e Mature Forest Slo e Old Growth Forest Flats Coastal Laaoon Freshwater Tidal Interdunal None of the above Check if unit has multiple ✓ HGM classes resent Wetland Rating Form—western Washington 1 August 2004 version 2 Wetland name or number -' V � Does the wetland unit being rated meet any of the criteria below? If you answer YES to any of the questions below you will need to protect the wetland according to the regulations regarding the special characteristics found in the wetland. � Check List for ��'etlands That 1�Za��Need Additional Protection I'ES NO � . � (in addition to the rotection recommended for its cate or-y � SP1. Has the wetland unit been documented as a habitatfor any Federally listed Threatened or Endangered animal or plant species (T/E species�? � !I For the purposes of this rating system, "documented" means the wetland is on the � a ro riate state or federal database. SP2. Has the wetland unit been documented as habitat for arry State listed Threatened or Endangered animal species? For the purposes of this rating system, "documented"means the wetland is on the appropriate state database. Note: Wetlands with State listed plant species are cate orized as Cate o I Natural Herita�e Wetlands (see . 19 of data form). SP3. Does the wetland unit contain individuals of Priorrty species listed by the R'DFW for the state? SP4. Does the wetland unit have a local significance in addition to its functions? For example,the wetland has been identified in the Shoreline Master � r O Program, the Critical Areas Ordinance, or in a local management plan as j`S having special significance. �� U��;-t,� �d.o� � ;� � (� ��- ( �-�� _ �� '� , VJ��i, a S ��a-�,�, �ti,��`�;�k- C W�v.'►'�C� "'l !;�':,c F �� r'1,�� t. �L��.'-� To com lete the next art�o th�`data shee�ou wi�need to determine the Hvdro eg omorphic Class of the wetland bein r� The hydrogeomorphic classification groups wetlands into those that fiznction in similar ways. This simplifies the questions needed to answer ho«7«Tell the wetland functions. The Hydrogeomorphic Class of a wetland can be determined using the key below. See p. 24 for more detailed instructions on classifying wetlands. Wetland Raung Form—westem VVashington 2 Aueust 2004 version 2 � �� Wetland name or number � �-� �S � t�5 Se55►�#- �,✓�,at- ��-C�.-�S� '�.�'E.. �-S ��;�k�^�� l� �r�-- ra, �; p��.^,c�.� .� o..v D�' l��`PX -�-�'�J C�I�`�-r.S -f'� Ca-r�a"t-,r�- �- �l� tr`�:lassificationlof Wetland Units in Western Washington � �— + • �SS e sSr�,,�- � 1 �,,��rt- ��,�.�l;;n.�.�� -�.� - 5,:;-� -i-t,� C , �- t� , If the hS�drologic criteria listed in each,question do not appl��to the entire unif being ' rated,ti�ou probabl��ha�-e'a unit tii�th multiple'HGI1i classes. In this case;identifj �i-hich h��drologic criteria in questions'1-7 appl}�, and go to Question 8. 1. Are the water levels in the entire,unit usually controlled by tides (i.e. except during floods)? ,�P�go to 2 YES—the wetland class is Tidal Fringe � If yes, is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? YES—Freshwater Tidal Fringe NO—Saltwater Tidal Fringe (Estuarine) If your wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Salrivater Tidal Fringe it is rated as an Estuarine wetland. Wetlands that were called estuarine in the first and second editions of the rating system are called Salt Vi�ater Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were categorized separately in the earlier editions, and this separation is being kept in this revision. To maintain consistency between editions,the term"Estuarine"wetland is kept. Please note, however,that the characteristics that define Category I and II estuarine wetlands have changed(see p. ). 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. `— 1�0—go to 3 YES—The wetland class is Flats If your wetland can be classified as a"Flats"wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet both of the follo�ving criteria? _The vegetated part of the wetland is on the shores of a body of permanent open water (without an}�vegetation on the surface) at least 20 acres(8 ha) in size; At least 30%of the open water area is deeper than 6.6 ft(2 m)? �NO—go to 4 YES—The wetland class is Lake-fringe{Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? �The«�etland is on a slope(slope can be very gradual}, �The��ater flows through the wetland in one direction(unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banlcs. The t��ater leaves the w�etland vvithout being impounded? �NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shalloK�depressions or behind hummocks(depressions are usually <3ft diameter and less than 1 foot deep). NO - go to 5 �YES—The wetland class is Slope Wetland Ratin�Form—v��estern Vvashin2ton 3 August 2004 version 2 Wetland name or number V � '�� 5. Does the entire wetland unit meet all of the follo«�ing criteria? The unit is in a valley, or stream channel,where it gets inundated by overbanl: flooding from that stream or river The overbank flooding occurs at least once every two years. 'I N07'E: The riverine unit can contain depressions that are frlled with water when the river is , not flooding. � `�I�O- go to 6 YES–The wetland class is Riverine ' b. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time during the year. This means that any outlet, if present, is higher than the interior of the wetland. '� NO–go to 7 YES–The wetland class is Depressional � 7. Is the entire wetland unit located in a�ery flat area with no obvious depression and no overbank flooding. The unit does not pond surface water more than a fev��inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious naiural outlet. NO–go to 8 YES–The wetland class is Depressional 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM clases. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a depressional wetland has a zone of flooding along its sides. GO BACK A:'�D IDENTIFY W�IICH OF TI�HYDROLOGIC REGLMES DESCRIBED II�T QLIESTIOI�TS 1-7 APPLY TO DIFFERENT AREAS IN TI�IJNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within your wetland. NOTE: Use this table only if the class that is recommended in the second column represents 10%or more of the total area of the wetland unit being rated. If the area of the class listed in column 2 is less than 10%of the unit; classify the wetland using the class that represents more than 90%of the total area. ��Y��CZ`ass�s�itlun ihe��tZ�ir'td„zinrt�ieiiz '°r'irterl .,_� �� ,.;.; HGM,Class to;U'se in Ratz.n .:: Slo e+Riverine Riverine Slo e+De ressional —� �I aqo � �r��35 t De ressional Slo e+Lake-frin e Lake-frin e Depressional+Riverine along stream within boundary Depressional De ressional+Lake-frin e De ressional Salt V4'ater Tid�l Frinae and an}�other class of freshwater Treat as ESTUARIl�'E under wetland v��etlands with special characteristics If you are unable still to determine which of the above criteria apply to your wetland, or if you have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. Wetland Ratine Form—western«'asnin�or. 4 Au�us?2004 version 2 V L v Wetland name or number ;'y,�� j� Depressional and Flats ti'�'etlands Points �'4'ATER QLALITY FL��CTIO:�'S - Inc]icators��llat the «-etland unit functi�ons to� �� (01�`'� 5607�� h� i�n rove«�ater ualit�- � � � � � D D 1. Does the«-etland unit have the potential to improve w�ater quality�? (see p.38) D 1.1 Characteristics of surface water flows out ofthe wetland: Figure_ Unit is a depression with no surface water leaving it(no outlet) points=3 D Unit has an intermittently flowing,OR highl}'constricted permanently flowing outlet points=2 Unit has an unconstricted,or slightly constricted,surface outlet (permanently flowing)points= 1 � Unit is a"flat"depression(Q.7 on key),or in the Flats class,with permanent surface outflow and no obvious natural outlet and/or outlet is a man-made ditch points=1 (If ditch is not permanently flowing treai unit as "iniermittently flowrng'� Provide hoto or drawin S 1.2 The soil 2 inches below the surface(or duff layer)is clay or organic (use NRCS definitions) q � D YES �� d � points=4 � NO oints=0 D 1.3 Characteristics of persistent vegetation(emergent,shrub,and/or forest Cowardin class} Figure_ Wetland has persistent,ungrazed,vegetation>=9�%of area points=5 D Wetland has persistent,ungrazed,vegetation>= 1/2 of area points=3� VJetland has persistent,ungrazed vegetation>= 1/10 of area points= 1 3 Wetland has persistent,ungrazed vegetation<1/10 of area points=0 Ma of Cowardin ve etation classes D 1.4 Characteristics of seasonal ponding or inundation. Figure_ D This is the area of the wetland unit that is ponded for at least 2 months, but dries out sometime during the year. Do not count the area that is permanently ponded. Estimate area as the average condition�out of 10 yrs. Area seasonally ponded is> '/�total area of wetland points=4 Area seasonally ponded is> '/4 total area of vvetland points=2 � � A.rea seasonally ponded is<'/< total area of wetland points=0 , Ma of H dro eriods ' �� D Total for D 1 Add the points in the boxes above 1 � (� 1 ' D D 2.Does the wetland unit have the onuortunitv to improre water quality? (see p. 44) Answer YES if you know or believe there are pollutants in groundwater or surface water coming into the wetland that would othervvise reduce water quality in streams, lakes or , groundwater downgradient from the wetland.lb'ote which of the following conditions � provide the sources ofpollutants. A unit may have pollutants coming from several sources, but any single source would qual�as opportunity. — Grazing in the wetland or within 150 f� — Untreated stormwater discharges to wetland — Tilled fields or orchards within 150 R of wetland � A stream or culvert discharges into wetland that drains developed areas,residential �, � farmed fields,roads,or clear-cut logging S�,O.•�n�'ot�L �'�"y�Si r'�'5��""'��"�t' Residential,urban areas,golf courses are within 150 ft of wetland �Q`�" multiplier — Wetland is fed by groundwater high in phosphorus or nitrogen — Other � YES multi lier is 2 h'O multi lier is i D TOTAL-Water Quality Functions Multiply the score from D1 by D2 Add score to table on . I �� Vr'etland Rating Form–western VVashington 5 August 2004 version 2 Wetland name or number�� j] Depressional and Flats�'�'etlands ' Points HZ'DROLOGIC FUNCTIONS - Indic.ators that the�;�etland unit functions to (°ni�'1 S�re '' reduce floodin and stream de�radation Pef�� __ D 3. Does tbe�j�etland unit ha�e the potential to reduce flooding and erosion? (see p.46) D D 3.1 Characteristics of surface water flows out of the wetland unit Unit is a depression with no surface water leaving it(no outiet) points=4 Unit has an intermittently flov�2ng,OR hiehly constricted permanently flowing outlet points=2 Unit is a"flat"depression(Q.7 on key),or in the Flau class,�zth permanent surface outflow and � no obvious natural outlet and/or outlet is a man-made ditch points= 1 (If ditch is not permanently flowing treai unit as "intermittently flowing") Unit has an unconstricted,or sli htl�constricted,surface outlet ermanentl flowin ) oints=0 D D 3.2 Depth of storage during wet periods Estimate the height ofponding above the bottom of the outlet. For units with no outlet measure from the surface ofpermanent water or deepest part(rf dry). Marks of ponding are 3 ft or more above the surface or bottom of outlet points=7 The wetland is a"headwater"wetland" points=5 Marks of ponding between 2 ft to<3 ft from surface or bottom of outlet points=5 � Marks are at least 0.5 ft to<2 ft from surface or bottom of outlet points=3 Unit is flat(yes to Q.2 or Q. 7 on key)but has small depressions on the surface that trap water points= 1 Marks of ondin less than 0.5 ft oints=0 D D 33 Contribution of wetland unit to storage in the watershed �S� �,�,a Estimate the ratio of the area of upstream basin contributing surface water to the wetland �,13,a to the area of the wetland unit itself. ��y r q� a� The area of the basin is less than 10 times the area of unit points=S � The area of the basin is 10 to 100 times the area of the unit ' points=3✓ �Ssv'►k'�C� f�'� is The area of the basin is more than 100 times the area of the unit points=0 � ;�(P��y' Entire unit is in the FLATS class oints=5 � ;� ��.�,�,,,,_ S D Total for D 3 Add the points in the boxes above � � � " r�x � D D 4. Does the wetland unit have the opportunihr to reduce flooding and erosion? (see p. 49) 5��.� Answer YES if the unit is in a locauon in the watershed where the flood storage,or reduction in water velocity,it provides helps protect downstream property and aquatic resources from flooding or excessive and/or erosive flows. Answer NO if the water coming into the wetland is controlled by a structure such as flood gate,tide gate, flap r alve,reservoir etc.OR you estimate that more than 90% of the water in the wetland is from groundwater in areas where damaging groundwater flooding does not occur. R%ote which of the following indicators of opportunity apply. — VVetland is in a headwater of a river or stream that has flooding problems — Vdetland drains to a river or stream that has flooding problems]��,,,�,°;.�,L,� S,,, �e- '^'� - — Vdetland has no outlet and impounds surface runoff water that might otherwise� S � flow into a river or stream that has flooding problems multiplier — Other ^ YES multi lier is 2 NO multi lier is 1 J� j� TOTAL -Hydrologic Functions Multiply the score from D 3 by D 4 Add score to table on p. I �o «'etland Ratine Form–western Washineton 6 Aub st 2004 version 2 Vdetland name or number�� Tlzese �acestio��s apply to fvetla�ads of all HG1L1�classes. � �� Points � �� ` (onh-7 sco;e' �-L�,BIT_AT FUNCTION� - Indicators that unit functions to provide important habitat. �:r�o�_} H 1. Does the�i�etland unit have the potential to provide habitat for many species? H 1.1 Ve�eta#ion structure(see p. 71) Figure_ Check the types of vegetation classes present(as defned by Cowardin)-Size threshold for each class is '/.acre or more tharz 10%of the area if unit is smaller than 2.S acres. Aquatic bed �Emergent plants ; Scrub/shrub(areas where shrubs have>30%cover) �Forested(areas where trees have>30%cover) If th unit has a forested class check f �The forested class has 3 out of 5 strata(canopy,sub-canopy, shrubs,herbaceous, � moss/ground-cover)that each cover 20%within the forested polygon Add the number of vegetation structures that qual�. If you have: 4 structures or more points=4 Map of Cowardin.vegetafion classes 3 structures points=2 2 struciures points= 1 1 structure oints=0 H 1.2.Hvdroperiods (see p. 73) Figure_ Check the types of water regimes(hydroperiods)present within the wetland. The water regime has to cover more than 10%of the wetland or'/.acre to count. (see text for descripfions of hydroperiods) Pertnanently flooded or inundated 4 or more types present points=3 �Seasonally flooded or inundated 3 types present points=2 ; � Occasionally flooded or inundated�" �`�'e-��,°Y 2 types present point= 1 � �Saturated only p�,r,r�� 1 type present points=0 ✓Permanently flowing stream or river in, or adjacent to,the wetland Seasonally flowing stream in, or adjacent to,the wetland Lake fringe wetland =2 points Freshwater tidal wetland=2 points Map of hydroperiods H 1.3.Richness of Plant Snecies(see p. 75) Count the number of plant species in the wetland that cover at least 10 ftZ. (different patches of the same species can be combined to meet the size threshold) You do not have to name the species. Do not include Eurasian Milfoil, reed canarygrass,purple loosestrife, Canadian Thistle If you counted: > i 9 species points=2 List species below if you want to: 5 - 19 species points= 1 <5 species points=0 � � � l Total for page� VVetland Ra#ing Form—western Washington 13 August 2004 version 2 Vl'etland name or number H 1.4. Interspersion ofhabitats (seep. 76) igure_ Decide from the diagrams below whether interspersion between Cowardin vegetation classes (described in H 1.1),or the classes and unvegetated areas(can include open water or mudflats)is high,medium,low,�r none. � F.x �: None=0 poinu Low= 1 point ?�loderate=2 points ��`� � = � . r�_.- k�`,�, .�;a �..,.::�:.. � �.:,{. ,...:-._.. . ^,�:,t `�._: � ' J � �32e��t;.��i� - ��.+.�_a. � [riparian braided channels] High =3 points NOTE:If;�ou have four or more classes or three vegetation cIasses and open water the ratin is alwa s"hi h". Use map of Cowardin ve etafion classes H 1.5. Special Habitat Features: (see p. 77) Check the habitat features that are presenr in the wetland. The number of checks is the `/ number ofpoints you put into the next column. " �Large,downed,woody debris within the wetland(>4in.diameter and 6 ft long). y,/Standing snags(diameter at the bottom>4 inches)in the wetland Undercut banks are present for at least 6.6 ft(2m)and�or overhanging vegetation extends at least 3.3 ft(lm) over a stream(or ditch)in, or contiguous with the unit, for at least 33 ft (l Om) Sta.ble steep banks of fine material that might be used by beaver or muskrat for denning (>30degree slope)OR signs of recent beaver activity are present(cut shrubs or trees that (� �have not yet turned grey/brown) ` At least�/<acre of thin-stemmed persistent vegetation or woody branches are present in azeas ` / that are permanently or seasonally inundated.(structures for egg-laying by amphibians) " Invasive plants cover less than 25%of the wetland area in each stratum of plants NOTE: The 20%stated in early printings of the manual on page 78 is an error. H l. TOTAL Score - potential for providing habitat �� Add the scores on�HI.1, H1.2, H1.3, H1.4, HI.S � _ ��_� Comments ZT��:tlar.� Ra.:n��-,��r�. �-��r�,�-r.Az.�a�7i�;:_�,-. ]�; ti��,::. ,;,;;_ �I �ersi;�n ' � � I' Wetiand name or number � � � �,j,t,�, 5�� ",S��`�`o�'c.S;,�.��"�-s��'��.w d.Q.v�.�w� � �`�- �`-�� , y J H 2. Does the wetland unit ha��e the opportunit3� to provide habitat for many species? H 2.1 Buffers (see p. 80) Figure_ Choose the descriplion that best represents condition of buffer of wetland unit. The highest scoring criterion that applies to the wetland is to be used in the rating. See text for defrnition of "undisturbed." — 100 m(330ft)of relatively undisturbed vegetated areas,rocky areas, or open water >95% of circumference. No structures are within the undisturbed part of buffer. (relatively undisturbed also means no-grazing,no landscaping,no daily human use) Points=5 — 100 m(330 ft) of relatively undisturbed vegetated areas,rocl.y areas,or open water > 50% circumference. Points=4 — 50 m(170ft)of relatively undisturbed vegetated areas,rocky areas,or open water>95% circumference. Points=4 — 100 m(330ft)of relatively undisturbed vegetated areas,rocky areas,or open water>25% circumference, . Points=3 — 50 m(170ft)of relatively undisturbed vegetated areas,rocky areas, or open water for> / 50% cucumference. � �1 C � Si d� � I�L� (J��S �.) Points=3 V � If buffer does not meet any�f the criteria above — No paved areas(except paved trails)or buildings within 25 m(80ft)of wetland>95% circumference. Light to moderate grazing,or law�ns are OK. Points=2 — No paved areas or buildings within SOm of wetland for>50% circumference. Light to moderate grazing,or lawns aze OK. Points=2 — Heaw grazing in buffer. Points=1 — Vegetated buffers are Qm wide(6.6ft)for more than 95% of the circumference (e.g.tilled fields,pavine;basalt bedrock ea�tend to edge of wetland Points=0. — Buffer does not meet any of the criteria aboee. Points= 1 Aerial hoto showin buffers H 2.2 Corridors and Connections (see p. 8l) H 2.2.1 Is the wetland part of a relatively undisturbed and unbroken vegetaxed corridor (either riparian or upland)that is at least 150 ft wide,has at least 30%cover of shrubs, forest or native undisturbed prairie,that connects to estuaries,other wetlands or undisturbed uplands that are at least 250 acres in size? (dams in riparian corridors,heavily used gravel roads,paved roads, are considered breaks in the corridor). YES=4 points (go to H2.3) NO=eo to H 2.2.2 � H 2.2.2 Is the wetland part of a relatively undishubed and unbroken vegetated corridor ( (either riparian or upland)that is at least SOft w�ide,has at least 30%cover of shrubs or fores� and connects to estuaries,other wetlands or undisturbed uplands that are at least 25 acres in size? OR a Lake-fringe wetland,if it does not have an undisturbed corridor as in the question above? YES =2 points (go to H2.3) NO=H 2.2.3 � H 2.23 Is the wetland: within 5 mi(8km)of a brackish or salt water estuary OR within 3 mi of a large field or pasture(>40 acres)OR within 1 mi of a lake gr ater than 20 acres? YES = 1 oint � I�O=0 oints � s ��'�� -t� �� , �-- a y►�.�,r Q� � `�- Total for page� � � Weiland Rating Fortn-western��'ashineton 15 Au�-ust 2004 ' version 2 Wetland name or number� H 23 Near or adiacent to other prioritv habitats listed by WDFW (see p. 82) Which of the following priority habitats are within 330ft(100m)of the wetland unit?NOTE.• the connections do not have to be relatively undisturbed. These are DFW def nitions. Check with your local DFW biologist if there are any questions. Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terresuial ecosystems which mutually influence each other. Aspen Stands: Pure or mixed stands of aspen greater than 0.8 ha(2 acres). Cliffs: Greater than 7.6 m(25 ft)high and occurring below 5000 ft. Old-grow�th forests: (Old-growth west of Cascade crest)Stands of at least 2 tree species, forming a multi-layered canopy with occasional small openings; with at least 20 trees/ha{8 irees/acre)> 81 cm(32 in)dbh or>200 years of age. Mature forests: Stands with average diameters exceeding 53 cm(21 in)dbh;crown cover may be less that 100%; crov��n cover may be less that 100%;decay, decadence,numbers of snags, and quantinr of large downed material is generally less than that found in old- growth; 80-200 years old west of the Cascade crest. Prairies: Relatively undisiurbed areas(as indicated by dominance of native plants)where grasses and/or forbs form the natural climax plant community. Talus: Homogenous areas�f rock rubble ranging in average size 0.15-2.0 m(0.5-6.5 fr), composed of basalt, andesite,and/or sedimentary rock,including riprap slides and mine tailings.May be associated w�th cliffs. Caves:A naturally occurring cavity, recess,void, or system of interconnected passages �I�,^� Oregon white Oak: Woodlands Stands�f pure oak or oak/conifer associations where �f��"�"��"��" canop;�coverage of the oak component of the stand is 25%. J�«\ i;rban ?�atural Open Space: A priority species resides wzthin or is adjacent to the open �-� space and uses it for breeding and/or regular feeding; and/or the open space functions as a corridor connecting other prioriry habitats, especially those that would otherwise be ��`J isolated;and/or the open space is an isolated remnant of natural habitat larger than 4 ha(10 �� acres)and is surrounded by urban development. Estuary/Estuary-like: Deepwater tidal habitats and adjacent tidal wetlands, usually semi- G��1'` enclosed by land but with open,partly obstructed or sporadic access to the open ocean,and 330' in which ocean water is at least occasionally diluted by freshwater runoff from the land. � The salinity may be periodically increased above that of the open ocean by evaporation. Along some low-energy coastlines there is appreciable dilution of sea water.Estuarine habitat extends upstream and landward to where ocean-derived salts measure less than O.Sppt.durine the period of average annual low flow. Includes both estuaries and lagoons. Marine/Estuarine Shorelines: Shorelines include the intertidal and subtidal zones of beaches, and may also include the backshore and adjacent components of the terrestrial landscape(e.g.;cliffs;snags,mature trees, dunes,meadows)that are important to shoreline associated fish and wildlife and that contribute to shoreline function(e.g.,sand/rock/log recruitrnent, nutrient contribution,erosion control). If wetland has 3 or more priority habitats=4 points If wetland has 2 priority habitats=3 points If wetland has 1 priority habitat=1 point No habitats=0 poinu Note:All vegetated wetlands are by def nition a priority habitat but are not included in this list. IVearb •wetlands are addressed in uestion H 2.4 �;'etland Ratin�:orm—western l�'ashinQton 16 Auoust 2GU4 ��ersion 2 � � VVetland name or nurnber -' rf�� H 2.4 R�etland Landscape(choose the one description of the landscape arowid the H erland thar best fits) (see p. 84) There are at least 3 other wetlands within '/�mile,and the connections between them are relatively undisturbed(light grazing between wetlands OK, as is lal:e shore with some boating,but connections should NOT be bisected by paved roads, fill, fields,or other development. pa��_ $ The wetland is Lal:e-fringe on a lake H�ith little disturbance and there are 3 other lake-fringe wetlands within '/z mile points=5 There are at least 3 other wetlands within'z mile,BL'T the connections between them are �� disturbed w�t��S Ma.�% '{�o eG�5-� o-4--} ` S�}�._ points=3 _� The wetland is Lake-fringe on a lake R�ith disturbance and there are 3 other lake-fringe wetland within '/�mile points=3 There is at least 1 wetland within'/z mile. points=2 There are no wetlands within '/z mile. points= 0 H 2. TOTAL Score - opportunity for providing habitat � �� , Add the scores om H2.I,H2.2, H2.3, H2.4 _ _ TOTAL for H 1 from page 14 1 9 II Total Score for Habitat Functions -add the points for H 1, H 2 and record the result on I �� r. 1 Wetland Rating Form—western�Vashineton 17 Aueust 2004 version 2 0 Wetland name or number VVETLAND RATING FORI1'I-WESTERl�'WASFiLNGTON pJ Version 2-Updated July 2006 to increase accuracy and reproducibility amone users �C�rr� D/ l�0(j� Name of wetland (if l:nown)• C(.✓ ( �Date of site visit: -I 1�l 0 � , �. Rated by L.- �a-��1� Trained by Ecology? Yes�No_ Date of training� a�� SEC: I� TWNSHP: �3 RNGE:� Is S/TIR in Appendix D? Yes_ No `� Map of wetland unit: Figure� Estimated size � 7, �� '��i�� SUMMARY OF RATING Category based on FUNCTIONS rovided by wetland I II III IV � Score for Water Quality Functions � Category I= Score>=70 Category II= Score 51-69 Score for Hydrologic Functions � Category III= Score 30-50 Score for Habitat Functions j 3 Cate�ory IV= Score<30 TOTAL score for Functions � Category based on SPECIAL CHARACTERISTICS of wetland I II Does not Apply� Final Category (choose tbe "highest" category from above) Summar� of basic information about the wetland unit VVetland Lnit has Special VVetland HG1�7 Class `Characteristics used for RatinQ Estuarine De ressional :�atural Heritaae VVetland Riverine BoQ Lake-frin e Mature Forest Slo e Old Growth Forest Flats Coastal Laaoon Freshwater Tidal Interdunal None of the above Check if unit has multiple HG?vI classes resent Wetland Rating Form—��es#err.�Vashington 1 august 2004 version 2 W'etland name or nuinber � Does the �;�etland unit being rated meet any of the criteria below? If you answer YES to any of the questions below you will need to protect the wetland according to the regulations regarding the special characteristics found in the wetland. Check List for �Vetlands That I17av Need Additional Protection YES NO (in addition to the rotection recommended for its cateaor-�� SP1. Has tlae iti-etlafzd ur�it beera documefited as a Iiabitat for-any FederalT�� listed � Threatened or Endangered ani»ial or plant species (7'/E speciesj? For the purposes of this rating system, "documented" means the wetland is on the a ro riate state or federal database. SP2.Has the wetland unit been documented as habitat for arry State listed Threatened or Endangered animnl species? For the purposes of this rating system, "documented" means the wetland is on the appropriate state database. Note: Wetlands with State listed plant species are cate orized as Cate o I Natural Heritaae Wetlands see . 19 of data form). SP3. Does the wetland unit contain individuals of Priority species listed by the YVDFW for the state? SP4. Does the wetland unit have a local sign�cance in addition to its functions? For example, the wetland has been identified in the Shoreline Master �� Program,the Critical Areas Ordinance, or in a local management plan as having special significance. To cofnplete the next pa��t of the data sheet vou will need to determine the Hvdro�eomorphic Class of the wetland bein�rated. The hydrogeomorphic classification groups wetlands into those that function in similar ways. This simplifies the questions needed to answer how well the wetland functions. The Hydrogeomorphic Class of a wetland can be determined using the key below. See p. 24 for more detailed instructions on classifyin� wetlands. Wetland Rating Form—western Washington 2 August 2004 version 2 V+'etland name or number ✓ Classification of Wetland Units in Western Washington If the h��drologic criteria'listed in each question do not appl�- to the entire unit being', rated,��ou probat�l�- ha�-e a unit��ith multiple HG�1 classes. In this case,identif�-vFhich � h�-drologic criteria in questions�l-7 app1�-, and co to Question 8.�� 1. Are he water levels in the entire unit usually controlled by tides (i.e. except during floods)? �O—go to 2 YES—the wetland class is Tidal Fringe If yes, is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? YES—Freshwater Tidal Fringe 1�0—Saltv�°ater Tidal Fringe (Estuarine) If your wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saltwater Tidal Fringe it is rated as an Estuarine wetland. VVetlands that were called estuarine in the first and second editions of the rating system are called Salt Vi�ater Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were categorized separately in the earlier editions, and this separation is being kept in this revision. To maintain consistency between editions, the term "Estuarine"wetland is kept, Please note, however, that the characteristics that define Category I and II estuarine wetlands have changed (see p. ). 2. The entire wetland unit is flat and precipitation is the onl�� source (>90%) of��ater to it. `Groundwater and surface water runoff are NOT sources of w°ater to the unit. NO—go to 3 YES—The wetland class is Flats If your wetland can be classified as a"Flats"«�etland, use the form for Depressional wetlands. 3. Does the entire�vetland unit meet both of the follo�i-in�criteria? _The vegetated part of the wetland is on the shores of a body of permanent open water (without any vegetation on the surface)at least 20 acres (8 ha) in size; At least 30% of the apen water area is deeper than 6.6 ft(2 m)? �NO—go to 4 YES—The wetland class is Lak�fringe (Lacustrine Fringe) 4. Does the�ire wetland unit meet all of the following criteria? �e wetland is on a slope(slope can be very graduan, �/The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow; ar in a swale without �istinct banks. he water lea�es the wetland without being impounded? IvTOTE: Suf face water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3ft dia_'�__ _er and less than 1 foot deep). NO - go to 5 vY"E5—The wetland class is Slope ll etland Rating Form—��estern«2shin�ton � AuQust�OU4 version� �`etland name or number �--�'""-� 5. Does the entire wetland unit meet all of the following criteria? The unit is in a valley, or stream channel,��here it gets inundated by overbank flooding from that stream or river The overbank flooding occurs at least once every two years. NOTE: The riverine unit can contain depressions tlurt are filled with water when the river is not flooding. NO - go to 6 YES—The wetland class is Riverine 6. Is the entire wetland unit in a topographic depression in v�Thich water ponds, or is saturated to the surface, at some time during the year. This means that any outlet, if present, is higher than the interior of the wetland. NO—go to 7 YES—The wetland class is Depressional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding. The unit does not pond surface water more than a few inches.The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. NO—go to 8 YES—The wetland class is Depressional � � ( (� �a 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM clases. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF TI�HYDROLOGIC REGIIv1ES DESCRIBED II�QL'EST'IONS 1-7 APPLY TO DIFFEREI�'I'AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within your wetland. NOTE: Use this table oniy if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. If the area of the class listed in column 2 is less than 10%of the unit; classify the wetland using the class that represents more than 90%of the total area. HG1L�Classes within tlze wetland uriit bein rated ' HG_�I Class to �,rse in Ratin Slo e�Riverine Riverine Slo e T De ressional De ressional r/` SIo e+Lake-frin�e Lake-fringe Depressional+Riverine along stream within boundary Depressional De ressional +Lake-frin�e De ressional Salt`Vater Tidal Fringe and any other class of freshwater Treat as ESTUARI?�IE under wetland wetlands with special characteristics If you are unable still to determine which of the above criteria apply to your wetland, or if you have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. ��'etland Ratine Form—western V�'ashin,;ton 4 August 2004 version� Wetland name or number � s Slope V�'etlands : Points R ATER QUALITY FUNCTIONS - Indicators that the«�etland unit functions to �°°b i S�°re ��> im ro<<e «�ater ualitt� - S ' S 1. Does the «efland unit ha��e the potential to impro�e ��ater qualit��? (see p.64) S S 1.1 Characteristics of average slope of unit: t t� Slope isl%or less(a 1%slope has a 1 foot vertical drop in elevation for every 100 ft � Gl � horizontal distance) points=3 � "N�� Slope is 1%-2% points=2 �ao� t Slope is 2%-5% points= 1 �7 So� Slope is greater than 5°/a points=0 � S S 1.2 The soi12 inches below the surface(or duff layer)is clay or organic (use NRCS deftnitioru) � YES=3 oints NO=0 oints S S 1.3 Characteristics of the vegetation in the wetland that trap sediments and pollutants: Figure_ Choose the points appropriate for the description that besi fits the vegetation in the wetland. Dense vegetation means you have trouble seeing the soil surface(>75% cover), and uncut means not grazed or mowed and plants are hrgher than 6 inches. Dense,uncut,herbaceous vegetation>90%of the wetland area points=6 Dense,uncut,herbaceous vegetation> 1/2 of area points=3 � Dense,woody,vegetation>'/� of area points=2 Dense,uncut,herbaceous vegetation> 1/4 of area points= 1 ✓ Does not meet any of the criteria above for vegetation points=0 Aerial hoto or ma with ve etation ol ons S Total for S 1 Add the points in the boxes above 1 � 1 S S 2.Does the wetland unit have the opportunit�� to improve water qualit3r? (see p.67) Answer YES if you know or believe there are pollutants in�,croundwater or surface water coming into the wetland that would otherwise reduce water quality in streams, lakes or groundwater down2radient from the wetland. Note which of ihe following conditions provide the sources ofpollutants. A unit may have pollutants coming from several sources, but any single source would qual�as opportunity. — Grazing in the wetland or within 150ft — Untreated stormwater discharges to wetland j —�1'illed fields,logging,or orchards within 150 feet of wetland , ✓ multiplier — Residential,urban areas,or golf courses are within 150 ft upslope of wetland — Other � YES multiplier is 2 T�O multiplier is 1 S TOT.4L- VF'ater Qualinr Functions Multiply the score from S1 by S2 � Add score to table on . 1 Comments Wetland Ratine Form-westem R'ashin�ton I 1 Aueust 2004 version 2 v V V Wetland name or number � s Slope ti'4'etlands Points HYDROLOGIC FL`'�CTIOI�S - Indicators that the wetland unit functions to r°°�y� S�°re �r t�X> reduce floodina and stream erosion S 3. Does the��etland unit ha��e the potential to reduce flooding and stream (see p.68) erosion? S S 3.1 Characteristics of vegetation that reduce the velocity of surface flows during storms. Choose the points appropriate for the description that best fit conditions in the wetland. (stems of plants should be thick enough(usually>1/Sin), or dense enough, to remain erect during surface flows) Dense,uncut, rigid vegetation covers >90%of the area of the wetland. points=6 � Dense,uncut,rigid vegetation> 1/2 area of wetland points=3 Dense,uncut, rigid vegetati�n> 1!4 area points= 1 More than 1/4 of area is grazed,mowed,tilled or vegetation is not ri id oints=0 S S 3.2 Characteristics of slope wetland that holds back small amounts of flood flows: The slope wetland has small surface depressions that can retain v��ater over at least 10%of its area. YES points=2 ✓ � NO oints=0 S Add the points in the boxes above 1 � ,� 1 S S 4.Does the wetland have the opportunitc to reduce floodiug and erosion? see p. 70) Is the wetland in a landscape position where the reduction in water velocity it provides helps pro ct dow�nstream property and aquatic resources from flooding or excessive and/or osive flows? Note which of the following conditions apply. — Wetland has surface runoff that drains to a river or stream that has flooding problems — Other multiplier (Answer NO if the major source of water is controlled by a reservoir(e.g. wetland is a seep I that is on the downstream side of a damj YES multi lier is 2 NO multi lier is 1 S TOTAL -Hydrologic Functions Multiply the score from S 3 by S 4 � Add score to table on p. I Comments Vr'etland Ratine Form—��estern�l ashin�ton ]2 Aueust?004 version 2 � � Wetland name or number These c�arestions apply to wetlanrls of aCl HGM classes. Points �� {only l score�� HABIT:�T FUNCTIO'�1S -Indicators tl�at unit functions to provide important habitat Per b��) H 1.Does the wetland unit have the potential to provide habitat for many species? H 1.1 VeQetation struct��re(see p. 72) Figure_ Check the types of vegetation classes present(as def ned by Cowardin)-Size threshold for each class is '/.acre or more than 10%of the area if unit is smaller than 2.S acres. �Aquatic bed Emergent plants �crub/shrub(areas where shrubs have>30%cover) Forested(areas where trees have>30% cover) If the unit has a forested class check if.� The forested class has 3 out of 5 strata(canopy,sub-canopy,shrubs,herbaceous, moss/ground-cover)that each cover 20%within the forested polygon � Add the number of vegetation structures that qual�. If you have: 4 structures or more points=4 .�� Map of Cowardin vegetation classes 3 structures points=2 / 2 structures points= 1 r/ 1 structure oints=0 H 1.2.Hvdroperiods (seep. 73) Figure_ Check the types of water regimes (hydroperiods�present within the wetland. The water regime has to cover more than 10%of the wetland or'/e acre to count. (see text for descriptions of hydroperiods) Permanently flooded or inundated 4 or more types present points=3 Seasonally flooded or inundated 3 fypes present points=2 ` �ccasionally flooded or inundated 2 types present point= 1 �S ✓Saturated only Y��a�' ^�� '� �''�E'`�S S`�' 1 ri�p�j re nt points=0 y�J p.�l�u i Lti0%o �'1�� p�r�t�i� � Permanently flowing st�am or nve ,or ad�ac nt to, e we an Seasonally flowing stream in,or adjacent to,the wetland Lake fringe wetland =2 points Freshwater tidal wetland=2 p�ints Map of hydroperiods H 1.3.Richness of Plant Snecies(see p. 75) Count the number of plant species in the wetland that cover at least 10 ft2. (d�erent patches of the same species can be combined to meet the siae threshold) You do not have to name the species. Do not include Eurasian Milfoil, reed canarygrass,purple loosestrife, Canadian Thistle If you counted: > 19 species points=2/ � List species below if you want to: 5 - 19 species points= 1 <5 species points=0 � '� Total for page � ��'etland Razine Form—western��'ashin_ton 13 ^�ueust?OG4 version 2 y V r- V�'etland name or number � ' H 1.4. Interspersion of habitats (see p. 76) igure_ Decide from the diagrams below whether interspersion between Cowardin veeetation classes (described in H 1.1),or the classes and unvegetated areas (can include open water or mudflats)is high,medium, low, or none. _ � � None=0 points Low= 1 point Moderate=2 points ' � � � \ , : � , - �� ;i:.-.•.: , I �..a � _,.�} � [riparian braided channels] High =3 points NOTE:If you have four or more classes or three vegetation classes and open water the ratin is alwa �s"hi h". Use map.of Cowardin ve etation classes H 1.5. Special Habitat Features: (see p. 77) Check the habitat features that are present in the wetland. The number of checks is the number ofpoints youput into the next column. Large,downed,woody debris within the wetland (>4in.diameter and 6 ft long). Standing snags(diameter at the bottom>4 inches)in the wetland Undercut banks are present for at least 6.6 ft(2m)and/or overhanging vegetation extends at least 3.3 ft(lm) over a sh�eam(or ditch)in, or contiguous with the unit,for at least 33 ft (l Om) Stable s#eep banks of fine material that mieht be used by beaver or muskrat for denning � (>30degree slope)OR signs of recent beaver activiTy are present(cut shrubs or trees that have not yet turned grey/brown) At least'/a acre of thin-stemmed persistent vegetation or woody branches are present in areas at are permanently or seasonally inundated(structures for egg-laying by amphibians) Invasive plants cover less than 25%of the wetland area in each stratum of plants NOTE: The 20%stated in early printings of the manual on page 78 is an error. H 1. TOTAL Score- potential for providing habitat � � �� Add the scores om Hl.l, Hl.2, HI.3, HI.4, Hl.5 __�_� Comments VJetland Rating Form—westem��,'ashinb on 14 August 2004 version 2 VJetland name or number� H 2. Does the wetland unit have the opportunity to provide habitat for many species? H 2.1 Buffers (see p. 80) Figure_ Choose the description that best represents condition of buffer of wetland unit. The highest scoring criterion that applies to the wetland is to be used in the rating.See text for definition of "undisturbed." — 100 m(330ft)of relatively undisturbed vegetated areas,rocky areas, or open water >9�% of circumference. No structures are within the undisturbed part of buffer. (relatively undisturbed also means no-grazing,no landscaping,no daily human use) Points=5 — 100 m{330 ft)of relatively undisturbed vegetated areas,roc�.y areas,or open water > �0% circumference. Points=4 50 m(170ft)of relatively undisturbed veg tated azeas,rocky areas, or open water>95% � circumference. �^�A– '� N • � � Points=4 � — 100 m(3�Oft)of relatively undisturbed vegetated areas,rocky areas,or open water>25% ; circumference, . Points=3 — 50 m(170ft)of relatively undisturbed vegetated areas,rocky areas, or open water for> 50%circumference. Points=3 If buffer does not meet any of the criteria above — No paved azeas (except paved traiis)or buildings within 25 m(80ft)of wetland>95°/a circumference. Light to moderate grazing, or lawns are OK. Points=2 — No paved areas or buildings within SOm ofwetland for>50%circumference. Light to moderate grazing,or lawns are OK. P�ints=2 — Heary grazing in buffer. Points= 1 — Vegetated buffers are<2m wide (6.6ft)for more than 95%of the circumference(e.g.tilled fields,paving,basalt bedrock extend t�edge of wetland Points=0. — Buffer does not meet any of the criteria above. Points=1 Aerial hoto showin buffers H 2.2 Corridors and Connections(see p. 8I) H 2.2.1 Is the wetland part of a relatively undisturbed and unbroken vegetated c�rridor (either riparian or upland)that is at least 150 ft wide,has at least 30% cover of shrubs,forest or native undisturbed prairie,that connects to estuaries,other wetlands or undisturbed uplands that aze at least 250 acres in size? (dams in riparian corridors,heavily used gravel roads,paved roads, are considered breaks in the corridor). YES=4 points (go to H2.3) NO =go to H 2.2.2 I-i 2.2.2 Is the wetland part of a relatively undisturbed and unbroken vegetated conidor (either riparian or upland)that is at least SOft wide,has at least 30%cover of shrubs or forest,and connects to estuaries,other wetlands or undisturbed uplands that are at least 2� � acres in size? OR a Lake-fringe wetland, if it does not have an undisturbed corridor as in the question above? YES =2 points (go to H 2.3) NO=H 22.3 H 2.2.3 Is the wetland: within 5 mi(8km)of a brackish or salt water estuary OR � within 3 mi of a large field or pasture(>40 acres)OR �� .� ►'`"� .S C within 1 mi of a lake greater than 20 acres? YES =1 oint � ?r�0=0 oints Total for page � ��'etland Rating Form–westem�t'ashington 15 August 2004 version 2 Wetland name or number� H 2.3 Near or adiacent to other nrioritv habitats listed bv WDFW(see p. 82) W'hich of the following priority habitats are within 330ft(100m) of the wetland unit?NOTE: the connections do not have to be relatively undisturbed. These are DFW defrnitions. Check with your local DF'W biologist if there are any questions. Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems w�hich mutually influence each other. Aspen Stands: Pure or mixed stands of aspen greater than 0.8 ha(2 acres). Cliffs: Greater than 7.6 m(25 ft)high and occurring below 5000 ft. Old-growth forests: (Old-growth west of Cascade crest)Stands of at least 2 tree species, forming a multi-layered canopy with occasional small openings;with at least 20 trees/ha(8 trees,�acre)> 81 cm(32 in) dbh or>200 years of age. Mature forests: Stands with average diatneters exceeding 53 cm(21 in)dbh;crown cover may be less that 100%;crown cover may be less that 100%;decay,decadence,numbers of snags, and quantity of large downed material is generally less than that found in old- growth; 80-200 years old west of the Cascade crest. Prairies: Relatively undisturbed areas(as indicated by dominance of native plants)where grasses and/or forbs form the natural climax plant community. Talus: Homogenous areas of rock rubble ranging in average size 0.15-2.0 m(0.5-6.5 ft), composed of basalt, andesite,and/or sed'unentary rock,including riprap slides and mine tailings. May be associated with cliffs. Caves:A naturally occuning cavity,recess,void, or system of interconnected passages Oregon white Oak: Woodlands Stands of pure oak or oak/conifer associations where canopy coverage of the oak component of the stand is 2�%. Urban Natural Open Space: A priority species resides within or is adjacent to the open space and uses it for breeding and/or regular feeding;and/or the open space functions as a corridor connecting other priority habitats, especially those that would otherwise be isolated; and/or the open space is an isolated remnant of natural habitat larger than 4 ha(10 acres)and is surr�unded by urban development. Estuary/Estuary-like: Deepwater tidal habitats and adjacent tidal wetlands,usually semi- enclosed by land but with open,partly obstructed or sporadic access to the open ocean, and in which ocean��ater is at least occasionally diluted by freshwater runoff from the land. The saliniry may be periodically increased above that of the open ocean by evaporation. Along some low-energy coastlines there is appreciable dilution of sea water. Estuarine habitat extends upstream and landward to where ocean-derived salts measure less than O.Sppt.during the period of average annual low flow.Includes both estuaries and lagoons. Marine/Estuarine Shorelines: Shorelines include the intertidal and subtidal zones of , beaches, and may also include the backshore and adjacent components of the terrestrial '' landscape (e.g., cliffs,snags,mature trees, dunes,meadows)that are important to shoreline associated fish and wildlife and that contribute to shoreline function(e.g.,sand/rock/log recruitment, nuh-ient contribution,erosion control). If wetland has 3 or more priority habitaxs=4 points If wetland has 2 priority habitats=3 points If wetland has 1 priority habitat=1 point No habitats=0 points 1Vote:All vegetated wetlands are by defrnition a priority habitat but are not included in this list. 11�earb wetlands are addressed in uestion H2.4j V4'etland Rating Form—western��'ashin;ton 16 August 2004 version 2 Wetland name or number � H 2.4 VVetland Landscape(choose the one description of the landscape around the wetland that best fits) (see p. 84) There are at least 3 other wetlands w�thin'/�mile,and the connections between them are relatively undisturbed(light grazing between wetlands OK,as is lake shore with some boating,but connections should NOT be bisected by paved roads,fill,fields,or other development. points =5 The wetland is Lake-fringe on a lake with little disturbance and there are 3 other lake-fi-inge wetlands within'/�mile points=5 There are at least 3 other wetlands within 1/z mile,BUT the connections between them are � disturbed points=3 The wetland is La1ce-fringe on a lake w�th disturbance and there are 3 other lalce-fringe wetland within '/Z mile points =3 There is at least 1 wetland v��ithin'/z mile. points=2 There are no wetlands within '/z mile. points=0 H 2. TOTAL Score - opportunity for providing habitat � � i � Add the scores om H2.I,H2.2, H2.3, H2.4 ---- TOTAL for H 1 from page 14 � Total Score for Habitat Functions —add the points for H 1, H 2 and record the result on � � . l �� R'etland RarinQ Form—western Washin�[on 17 August 2G04 version 2 Wetland name or number� WETLAND R.ATING FORM-WESTERN WASHL'�1GTON �� S J, l�\ Version 2-Updated July 2006 to increase accuracy and reproducibility among users �� / J Name of wetland (if lazown): �� Date of site visit: �/�/�� Rated by �,��..t�ii Q� �l Trained by Ecology? Yes✓No Date of trainin� �4C�S /� � SEC:�v TVVNSHP: �RNGE: � Is SfT/R in Appendix D? Yes_ I�� Map of wetland unit: Figure� Estimated size �, ��`� � �� S��- SUMMARY OF RATING Category based on FUNCTIONS provided by wetland I II IlI IV / Score for Water Quality Functions �a Category I= Score>=70 Category II= Score 51-69 Score for Hydrologic Functions [� Category III=Score 30-50 Score for Habitat Functions �� CateQory IV= Score<30 TOTAL score for Functions a Category based on SPECIAL CHAR.ACTERISTICS of vvetland I II Does not Apply Fi11al Categoly (choose the ��highest" category from above) Summary of basic information about the wetland unit �'�'etland Unit has Special Wetland HGM Class Characteristics used for Ratin Estuarine De ressional l�atural HeritaQe Wetland Riverine Bo Lake-frin e Mature Forest Slo e Old Grovvth Forest Flats Coastal Laaoon Freshwater Tidal Interdunal None of the above Check if unit has multiple HGM classes resent R'etland Ratin�Form-western Vlashin�on 1 August 2004 version 2 V�'etland name or number� Does the wetland unit being rated meet any of the criteria below? If you answer YES to any of the questions below you will need to protect the wetland according to the regulations regarding the special characteristics found in the wetland. ' Check List for �'4'etlands That I1Za�-Need Additional Protection' YES N� � (in addition to the rotection recommended for its cateQor�-) SP 1. Has the tia etlaf�d atf�ait beef� docun�ented as a habitat for any Federally listed Threatened or Endangered animal or plant species (7YE species)? For the purposes of this rating system, "documented"means the wetland is on the a ro riate state or federal database. SP2. Has 1he wetland unit been documented as habitat for arry State listed Threatened or Endangered animal species? For the purposes of this rating system, "documented"means the wetland is on the appropriate state database. Note: Wetlands with State listed plant species are cate orized as Cate o I Natural Herita e V4'etlands see . 19 of data form . SP3. Does the wetland unit contain individuals of Priority species listed by the WDFYV for the slate? SP4. Does the wetland unit have a local significance in addition to its functions? � For example,the wetland has been identified in the Shoreline Master � ��- Prob am, the Critical Areas Ordinance, or in a local management plan as having special significance. To complete the next pat�t of the data sheet vou will need to deteYmine the Hvdro�eomorphic Class of the wetland bein rated. The hydrogeomorphic classification groups wetlands into those that function in similar vs�ays. This siznplifies the questions needed to answer how well the wetland functions. The Hydrogeomorphic Class of a wetland can be determined using the ke}�below. See p. 24 for more detailed instructions on classif5-ing wetlands. VJetland Rating Form—western V+'ashington ? Au,�ust 20C�4 version 2 Wetland name or number� Classification of V4'etland Units in Western Washington ��If tire��hj-drologic criteria�listed in each._question do n'ot a�ppl�-to the entire unit ti�being�� rated,��ou �robabl�- ha��e a unit j��ith multiple HG11f classes.: In this case,identify�i-hich ( h�•drolo�ic criteria in questions 1-7 app1�-, and go to'�uestion S. 1.Ar��he water levels in the entire unit usually controlled by tides (i.e. except during floods)? '�IO—go to 2 YES—the wetland class is Tidal Fringe If yes, is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? YES—Freshwater Tidal Fringe NO—Saltwater Tidal Fringe (Estuarine) If your wetland can be class�ed as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saliwater Tidal Fringe it is rated as an Estuarine wetland. Wetlands that were called estuarine in the first and second editions of the rating system are called Salt Water Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were categorized separately in the earlier editions, and this separation is being kept in this revision. To maintain consistency between editions, the term"Estuarine"wetland is kept. Please note, however,that the characteristics that define Category I and II estuarine wetlands have changed (see p. ). 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. ✓I�O—go to 3 YES—The wetland class is Flats If your wetland can be classified as a"Flats"wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet both of the following criteria? The vegetated part of the wetland is on the shores of a body of permanent open water (without any vegetation on the surface) at least 20 acres(8 ha) in size; At least 30%of the open water area is deeper than 6.6 ft (2 m)? I�TO—go to 4 YES—The wetland class is Lal�e-fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? The wetland is on a slope(slope can be very gradua�, The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks. The water leaves the wetland without being impounded? NOTE: Surface water does not pond in these rype of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually - <3ft diameter and less than 1 foot deep). P�O - go to 5 YES—The wetland class is Slope Vl'etland Rating Form—westem Washington 3 August 2004 version 2 Wetland name or number� 5. Does the entire wetland unit meet all of the following criteria? The unit is in a valley,or stream channel,where it gets inundated by o��erbank flooding from that stream or river The overbanl:flooding occurs at least once every two years. ATOTE: The riverine unit can contain depressions that are filled with w�ater when the river is n91 flooding. � go to 6 YES—The wetland class is Ri��erine 6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time during the year. This mean.s that any outlet, if present, is higher than the interior of the wetland. Iv0—go to 7 ,/YES—The wetland class is Depressional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding. The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched,but has no obvious natural outlet. NO—go to 8 YES—The wetland class is Depressional S. Your wetland unit seems to be difficult to classify and probably contains several different HGM clases. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a depressional wetland has a zone of flooding along its sides. GO BACK AND IDEIvTTIFY Vi�THICH OF THE HYDROLOGIC REGIUIES DESCRIBED IN QLTESTIOI��S 1-7 APPLY TO DffFERENT AREAS IN TI�tJNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have sev eral HGM classes present within your wetland. NOTE: Use this table only if the class that is recommended in the second column represents 10%or more of the total area of the wetland unit being rated. If the area of the class listed in column 2 is less than 10%of the unit; classify the wetland using the class that represents more than 90%of the total area. HG_�I Classes K�ithin Z1ie'ivetland unif beina'rated HG��I Class to Use i�z Ratin Slo e+Riverine Riverine Slo e+De ressional De ressional Slo e+Lake-frin e Lake-frin e Depressional +Riverine along stream within boundary Depressional De ressional +Lake-frin e De ressional Salt Water Tidal Fringe and any other class of freshwater Treat as ESTliARINE under wetland wetlands with special characteristics If you are unable still to determine which of the above criteria apply to your wetland, or if you have more than 2 HG?�1 classes within a wetland boundary, classify the wetland as Depressional for the rating. Vb`etland Ratine Form—western Washineton 4 August 2004 version 2 Wetland name or number � �� DepressionaI and Flatsti'�'e�tlands � � - � � Points�:�� ', �'�'ATER QU.4I.ITY FL��CTIO\S - Indicators that the��etland unit functions to turi`'' S�ozz ' ' per boxj llll I'OV��'3tZI" U'cllltt' � D 1. Does the w�etland unit ha��e the potential to improve�i�ater qualit��? (see p.38) �� D 1.1 Characteristics of surface water flows out of the wetland: Figure_ Unit is a depression with no surface watet leaving it(no outlet) points=3 D Unit has an intermittently flowing,OR highly constricted permanently flowing outlet points=2 Unit has an unconstricted,or slightly constricted,surface outlet (permanently flowing)points=1 Unit is a"flat"depression(Q.7 on key),or in the Flats class,with permanent surface outflow and, � no obvious natural outlet and�or outlet is a man-made ditch points=1�' (If ditch is not permanenily flowing treat unit as "intermittently flowing'� Provide hoto or drawin S 1.2 The soi12 inches below the surface(or duff layer) is clay or organic (use NRCS defrnitions) – � D YES points=4 NO oints–0 D 13 Characteristics ofpersistent vegetation(emergent,shrub,and,�or forest Cowardin class) Figure_ Wetland has persistent,ungrazed,vegetation>=95%of azea points=5 D VJetland has persistent,ungrazed,vegetation>= 112 of area points=3 `� � VJetland has persistent,ungrazed vegetation>= 1/10 of area points= 1 VJetland has persistent,ungrazed vegetation<1/10 of area points=0 Ma of Cowardin.ve etation classes D1.4 Characteristics of seasonal ponding or inundation. Figure_ D This is the area of the wetland unit that is ponded for at least 2 months, but dries out sometime during the year. Do not count the area that is permanently ponded. Estimate area as the average condition 5 out of 10 yrs. Area seasonally ponded is>'/�total area of wetland points=4 � Area seasonally ponded is> '/< total area of wetland points=2 ` Area seasonally ponded is<'/< total area of wetland points=0 V Ma of H dro eriods �� D Total for D 1 Add the points in the boxes above � (p 1 D D 2.Does the wetland unit have the opportunitv to improve water quality? (see p. 44) Answer YES if you know or believe there are pollutants in groundwater or surface water coming into the wetland that would otherwise reduce water quality in streams, lakes or groundwater downgradient from the wetland.Note which of the following conditions provide the sources ofpollutants. A unit may have pollutants coming from several sources, but any single source would qualify as opportuniry. — Grazing in the wetland or within 150 ft — Untreated stormwater discharges to wetland — Tilled fields or orchards within 150 ft of wetland — A stream or culvert discharges into wetland that drains developed areas,residential areas, �farmed fields,roads,or clear-cut logging Residentiai,urban azeas,golf courses are within 150 ft of wetland multipliei — R�etland is fed by goundwater high in phosphorus or nitrogen � — Other YES multi lier is 2 NO multi lier is 1 j� TOTAL- V4'ater Quality�Functions Multiply the score from D1 by D2 I� Add score to table on . 1 VJetland Rating Form—western Washington 5 August 2004 version 2 �Wetland name or number � j� Depressional and Flats «%etlands Points H�'DROLOGIC FL�TCTIONS - Indicators that the wetland unit fitnctions to (°°>>' � S�re reduce floodina and stream deeradation' �r b�X} : D 3. Does the wetland unit ha��e the potential to reduce flooding and erosion? (see p.46) D D 3.1 Characteristics of surface water flows out of the wetland unit Unit is a depression with no surface water leaving it(no outlet) points=4 Unit has an intemuttendy flowing,OR highly constricted permanently flowing outlet points=2 � Unit is a"flat"depression(Q.7 on key),or in the Flats class,with permanent surface outflow and �- no obvious natural outlet and/or outiet is a man-made ditch points= 1. (If ditch is not permanently flow�ing ireat unit as "inlermittently flowing'� Unit has an unconstricted,or sli htiv constricted,surface outlet ermanentl owin ints=0 D D 3.2 Depth of storage during wet periods Estimate the height ofponding above the bottom of the outlet. For units with no oullet measure from the surface of permanent water or deepest part(if dry). Marks of ponding are 3 ft or more above the surface or bottom of outlet points=7 The wetland is a"headwater"wetland" points t 5 Marks of ponding between 2 ft to<3 ft from surface or bottom of outlet points=5 Marks aze at least 0.5 ft to<2 ft from surface or bottom of outlet points=3 Unit is flat(yes to Q.2 or Q. 7 on key)but has small depressions on the surface that trap water points= 1� / Marks of ondin less than 0.5 ft oints=O✓ D D 33 Contriburion of wetland unit to storage in the watershed Estimate the ratio of the area of upstream basin coniributing surface water to the wetland �� to the area ojthe wetland unit ifself. _ ' � The area of the basin is less than 10 times the area of unit points=5 --��a� The area of the basin is 10 to 100 times the area of the unit points-3 c�� The area of the basin is more than 100 times the area of the unit points=0 �\ `C( Entire unit is in the FLATS class oints=5 ��'�` D Total for D 3 Add the points in the boxes above � � � p0 —�— � �j� � D D 4.Does the wetland unit have the opportunity to reduce flooding and erosion? (see p. 49) � Answer YES if the unit is in a location in the watershed where the flood storage,or reduction in water velocity,it provides helps protect dow�nstream property and aquatic resources from flooding or excessive and/or erosive flows. Answer NO if the water coming into the wetland is controlled by a structure such as flood gate,tide gate,flap valve,reservoir etc.OR you estimate that more than 90% of the water in the wetland is from groundwater in areas where damaging groundwater flooding does not occur. Note which of the following indicators of opportunity apply. — R%etland is in a headwater of a river or stream that has flooding problems — Wetland drains to a river or stream that has flooding problems — Wetland has no outlet and impounds surface runoff water that might otherwise flow into a river or stream that has flooding problems ��o d ` multipller 0�5 �b� — Other q b c�'�'�{�� YES multi lier is 2 NO multi lier is 1 � D TOTAL -Hydrologic Functions Multiply the score from D 3 by D 4 � Add score to table on p. 1 ' �T+'et:and Rating Form-��estern��'ashington 6 Au�ust 2004 version 2 Vi�'etland name or number � Tlzese qccestiorrs apply�to x�etlands of all HGMclasses. Points (only 1 score HABITAT FL�NCTIO'�S - Indicators that unit functions to provide imporzant habitat � per�.� '�� H 1.Does the wetland unit have the potential to provide habitat for many species? H 1.1 VeQetation structure(see p. 72) Figure_ Check the types of vegetation classes present(as defined by Cowardin)-Size threshold for each class is '/.acre or more than 10%of the area if unit is smnller than 2.S acres. Aquatic bed o �t� Emergent plants ��55 1"�. �� C"�-\ W� ��e�� ,,�'l �crub/shrub(areas where shrubs have>30%cover) �"L"\�' Forested(areas where trees ha��e>30%cover) �J �If the it has a forested class check if e forested class has 3 out of�strata(canopy,sub-canopy,shrubs,herbaceous, moss/ground-cover)that each cover 20%within the forested polygon � Add the number of vegetation structures that qualify. If you have: .. ' 4 structures or more points=4 Map of Coward"m vegetation classes 3 structures points=2 2 structures points= 1 1 structure oints=0 H 1.2.Hvdroperiods (see p. 73) Figure_ Check the types of water regimes (hydroperiods)present wiihin the wetland. The water regime has to cover more than 10%of the wetland or%acre to count. (see text for descriptions of hydroperiods� Permanently flooded or inundated 4 or more types present points=3 �easonally fiooded or inundated 3 types present points=2 Qccasionally flooded or inundated 2 types present point= 1 � ••�Saturated only 1 type present points=0 Permanently flowing stream or river in, or adjacent to,the wetland Seasonally flowing stream in; or adjacent to,the wefland Lake fringe wetland =2 points Freshwater tidal wetland=2 points Map of hydroperiods H 1.3. Richness of Plant Snecies(see p. 75) Count the number of plant species in the wetland that cover at least 10 ftZ. (different patches of the same species can be combined to meet the size threshold� You do not have to name the species. Do not include Eurasian Milfoil, reed canarygrass,purple loosestrife, Canadian Thistle If you counted: > 19 species points=2 List species below if you want to: 5- 19 species points= 1 <5 species points=0 5� � � , �- Total for pa�e � Wetland RatinQ Form—western Washin2ton 13 Au�ust 2004 version 2 V y V6'etland name or number� H 1.4. Interspersion of habitats(see p. 76) igure_ Decide from the diagrams below whether interspersion between Cowardin vegetation classes(described in H 1.1),or the classes and unvegetated azeas(can include open water or mudflats) is high,medium,low, or none. � N ��A �� None=0 points v Low= 1 point _ Moderate=2 points � . � ��#� x�:'. ."` £�.4� 1 ��. 'I . - ' � � �' % �': � [riparian braided channelsJ High =3 points NOTE: If you have four or more classes or three vegetation classes and open water the ratin is alwavs"hi h". Use map of Cowardin ve etation classes H 1.5. Special Habitat Features: (see p. 77) Check the habitat features that are present in the wetland. The number of checks is the number ofpoints you put into the next column. ; Large,downed;woody debris within the wetland(>4in.diameter and 6 ft long). J Standing snags (diameter at the bottom>4 inches)in the wetland Undercut banks are present for at]east 6.6 ft(2m)and/or overhanging vegetation extends at ieast 3.3 ft(lm)over a stream(or ditch)in,or contiguous v��ith the unit, for at least 33 ft (l Om) Stable steep banks of fine material that might be used by beaver or musla�at for denning � (>30degree slope)OR signs of recent beaver activiiy are present(cut shrubs or trees that have not yet turned grey/brown) At least �/4 acre of thin-stemmed persistent vegetation or woody branches are present in areas that are permanently or seasonally inundated(structures for egg-Icrying by amphibians) Invasive plants cover less than 25% of the wetland area in each stratum of plants Ru p, � o NOTE: The 20%stated in early printings of the manual on page 78 is an error. � �-%' ' H 1. TOTAL Score - potential for providing habitat � Add the scores�rom Hl.l, H1.2, H1.3, H1.4, H1.5 � � � �_:,_� Comments VVetland Rating Form—western Washington 14 August 2004 version 2 1��etland name or number H 2. Does the wetland unit have the opportunity to provide habitat for many species? H 2.1 Buffers (see p. 80) Figure_ Choose the description that best represents condition of buffer of wetland unit. The highest scoring criterion that applies to the wetland is to be used in the rating. See text for definition of "undisturbed." — 100 m(330ft)of relatively undisturbed vegetated areas,rocky areas, or open water >95% of circumference. No structures are within the undisturbed part of buffer. (relatively undisturbed also means no-grazing,no landscaping,no daily human use) Points=5 — 100 m(330 ft)of relarively undisturbed vegetated areas,rocky areas,or open water > 50% circumference. Points=4 — 50 m(170ft)of relatively undisturbed vegetated areas,rocl.y areas,or open water>95% circumference. Points=4 — 100 m(330ft) of relatively undisturbed vegetated areas,rocky areas,or open water>25% circumference, . Points=3 � — 50 m(170ft)of relatively undisturbed vegetated areas,rocky areas,or open water for> / 50% circumference. ��D.�'OC.�(. �C��rS �$� �QS�- -�'D �f 1 E� L.�Points=3 V If buffer does not meet any of the criteria above — No pa�ed azeas (except paved trails)or buildings within 25 m(SOft)of wetland>95% circumference. Light to moderate grazing, or lawns are OK. Points=2 — No paved areas or buildings within SOm of wetland for>50%circumference. Light to moderate grazing,or lawns are OK. Points=2 — Heavy grazing in buffer. Points= 1 — Vegetated buffers are<2m v�ride(6.6ft)for more than 95% of the circumference(e.g.rilled fields,paving,basalt bedrock extend to edge of wetland Points=0. — Buffer does not meet any of the criteria above. Points=1 Aerial hoto showin buffers H 2.2 Corridors and Connections (see p. 81) H 2.2.1 Is the wetland part of a relatively undisturbed and unbroken vegetated corridor (either riparian or upland)that is at least 150 ft wide,has at least 30%cover of shrubs, forest or native undisturbed prairie,that connects to estuaries,other wetlands or undisturbed uplands that are at least 2�0 acres in size? (dams in riparian corridors,heavily used gravel roads,paved roads, are considered breaks in the corridor). YES=4 points (go to H2.3) NO=go to H 2.2.2 H 2.2.2 Is the wetland part of a relatively undisturbed and unbroken vegetated corridor (either riparian or upland)that is at least SOft wide, has at least 30%cover of shrubs or � forest, and connects to estuaries,other wetlands or undisturbed uplands that are at]east 25 acres in size? OR a Lake-fringe wetland,if it does not have an undisturbed corridor as in �— the question above? YES =2 points (go to H2.3) NO=H 2.2.3 H 2.2.3 Is the wetland: within 5 mi(81:m)of a brackish or salt water estuary OR � within 3 mi of a large field or pasture(>40 acres)OR �� within 1 mi of a lake greater than 20 acres? YES =1 oint � ?�TO=0 oints Total for page �' Wet d � o -we R' _ 0 4 i lan Ratm�Form stern ashm�ton 1� Au�wt 200 version 2 �T�'etland name or number � H 23 Near or adiacent to other priorit� habitats listed bv WDFW (see p. 82) Which of the following priority habitats are within 330ft(100m)of the wetland unit?NOTE.• the connections do not have to be relatively undisturbed. These are DFW defrnitions. Check with your local DFW biologist if there are arry quesiions. Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems which mutually influence each other. Aspen Stands: Pure or mixed stands of aspen greater than 0.8 ha(2 acres). Cliffs: Greater than 7.6 m(25 ft)high and occurring below 5000 ft. Old-growth forests: (Old-growth west of Cascade crest)Stands of at least 2 tree species, forming a multi-layered canopy with occasional small openings;with at least 20 trees/ha(8 ,I trees/acre)> 81 cm(32 in) dbh or>200 years of age. , Mature forests: Stands with average diameters exceeding 53 cm(21 in)dbh; crown cover may be less that 100%;crow�n cover may be less that 100%;decay, decadence, numbers of snags,and quantity of large downed material is generally less than that found in old- growth; 80-200 years old west of the Cascade crest. Prairies: Relatively undisturbed areas(as indicated by dominance of native plants)where grasses and/or forbs form the natural clima�t plant community. Talus: Homogenous areas of rock rubble ranging in average size 0.15 -2.0 m(0.5-6.5 ft), composed of basalt,andesite, and,�or sedimentary rock,including riprap slides and mine tailings.May be associated with cliffs. Caves:A naturally occurring cavity,recess,void, or system of interconnected passages Oregon white Oak: R'oodlands Stands of pure oak or oak/conifer associations where canopy coverage of the oak component of the stand is 25%. � Urban Natural Open Space: A prioriTy species resides within or is adjacent to the open space and uses it for breeding and/or regular feeding;and/or the open space functions as a corridor connecting other priority habitats,especially those that would otherwise be isolated; and/or the open space is an isolated remnant of natural habitat larger than 4 ha(10 acres)and is surrounded by urban development. Estuary/Estuary-like:Deepwater tidal habitats and adjacent tidal wetlands,usually semi- enclosed by land but with open,partly obstructed or sporadic access to the open ocean, and in which ocean water is at least occasionally diluted by freshwater runoff from the land. The salinity may be periodically increased above that of the open ocean by evaporation. Along some low-energy coastlines there is appreciable dilution of sea water.Estuarine habitat extends upstream and landward to where ocean-derived salts measure less than O.Sppt.during the period of average annual low flow. Includes both estuaries and lagoons. Marine/Estuarine Shorelines: Shorelines include the intertidal and subtidal zones of beaches, and may also include the backshore and adjacent components of the terrestrial landscape(e.g., cliffs,snags,mature trees,dunes,meadows)that are important to shoreline associated fish and wildlife and that contribute to shoreline function(e.g.,sand/rock�log recruihnent,nutrient contribution,erosion control). If wetland has 3 or more priority habitats=4 points If wetland has 2 priority habitats=3 points If wetland has 1 priority habitat=1 point No habitats=0 points l�Tote:All vegetated wetlands are by definition a priority habitat but are not included in this list. Nearb •weilands are addressed in uestion H2.4J ��etland Rating Form—western R`ashington i 6 August 2004 version 2 Wetland name or number� H 2.4 Wetland Landscape (choose the one description of 1he landscape around the wetland that best fits) (see p. 84) There are at least 3 other wetlands within'/z mile,and the connections between them are relatively undisturbed(light grazing between wetlands OK,as is lake shore with some boating,but connections should NOT be bisected by paved roads,fill, fields,or other development. points= 5 The wetland is Lake-fringe on a lake with little disturbance and there are 3 other lake-fringe wetlands within '/�mile points=5 There are at least 3 other wetlands within'/z mile,BUT the connections between them are disturbed points=3 � The wetland is Lake-fringe on a lake w�ith disturbance and there aze 3 other lake-fringe wetland within '/�mile points=3 There is at least 1 wetland within'/a mile. points=2 There are n�wetlands within'/s mile. points=0 H 2.TOTAL Score - opportunity for providing habitat r—i�— Add the scores om H2.I,H2.2, H2.3, H2.4 � � � TOTAL for H 1 from page 14 —� _ Total Score for Habitat Functions -add the points for H 1,H 2 and record the result ol � � �'�'etland Ratine Porm-western��'ashineton 17 August 2004 version 2 � CP H CONSULTANTS $ECTION 6.2 TRAFFIC IMPACT ANALYSIS �THE TRANSPO GROUP; DECEMBER � H, 2007� Site Planning Civil Engineering Project Management Land Development Consulting 7}ie ' �� Trar�po y� gr,',€;E ��;:- .,Y�,F. UCQup . .,�� t � � �- €_ . _... .., . ...,,::� DecemUer 18,2007 TG: 0?015.00 11r. Greg Strong Rick Burnstead Construction Company 11980 NE 24th Street, Suite 200 Belleive,�X'A 98005 SUBJECT: DELANEY PARK SUBDIVISION—SUPPLEMENTAL TRAFFIC IMPACT ANALYSIS Dear Greg. Per vour request,�ve ha�-e reaiewed the transportation-related comments described ui ILing Countt�� Ke juest for_�dditional Irrfornlalron dated September�,2007.��'e hati e prepared this tecluucal letter in response to the follo�ving comment: "6. Pro�Tide a Le�-e1 I Traftic Impact rinah-sis to identif�� the r1�'�-1 and PRi peak hour impacts, and le`-els-of-ser�-ice, at the follo�ving inteisections: � ■ SR 900/148th t�venue SE (signalization s�-stem under construction) ■ Plat entrance/]48th l�venue SE Please include an assessment,based upon the criteria ui the��i%SDOT Desigtr��Iarraral,of the potential for installation of a center turn luie on 148th A�-enue SE at die project entrance— and,hence,any associated road�sa��videning." �fuch of the requested analysis��-as documented in a tecluiical letter�t-e prepared dated Jiil} 17,2007. As part of this anal�-sis,u�e e�-aluated the access road«-ay ("Plat entrance/148th Aeenue SE'� �cith respect to sight distance,intersection spacuig,traftic operations ("le�-els-of-ser�rice'�, and turn lane requirements. ��'e also re�-ie�ved the e�isting pedestrian facilities bet�reen the project site and r�pollo Element�in-School and c��lculated applicable trafFic unpact fees based on King County's�fitigation PaFment S�-stem (1IPS).This a.nal�sis did not,ho�;�ever,evaluate potential rraffic operations and safeh- impacts at the recentl�--sign�►lized intersection of SR 900/148th A�-enue SE. Potenti.il impacts at tlus location are documented in this tecluucal letter. I Project Description The project site is located at 12019 148th A�-enue SE in Lu�incorporated I�ing Cotuity.�s illustrated in i Attachment 1, the proiect site is located«-est of 148th Avenue SE just north of the Cih-of Renton. I ��'e Lu-iderstand the proposed project u-ould include the constniction of up to 27 su�gle-family d«-elling units. �'elucular access u-ould be pro�-ided �-ia 148`�'t1��enue SE and the adjacent C.unu'est de�-elopment ("East Renton'� to the north. A preluiunan-site plan is illustrated in Attachinent 2. The proposed project is e.r-pected to be comPleted, occupied and geiier�ltiti�traffic b�-201�. • The Transpo Group Inc. 11730 �18tn Avenue N.E.,Suite 600 Kirkland,WA 98034-7"20 425r`821-3665 Fax: 425J825-3434 � l�ir. Greg Strong ��S'�]O December 18,200? --�� Page2of� Roadway Netwark In the vicinin-of 148th��-enue SE, SR 900 is a tt��o-/three-lane pruicipal arterial�rid�a posted speed limit of 40 miles per hour(mph). 148th A�-enue SE is a tu-o-lane collector arterial«idi pa�-ed shoulders and a posted speed limit oE 3� mph. Left- and/or right-turn lanes do not esist in the northbound and southbound directions at SR 900/148th A�-enue SE. The traffic unpact an.il�-ses prepared on beh�ilf of the de�-elopers of Aster Park, East Renton, Rosemonte, Shamrock Heights, and Stoneridge concluded that projects ui the area«ould ha�-e a significant ad�-erse impact at SR 900/148th�renue SE and SR 900/164th�venue SE. To mitigate such impacts, Iung Count�•required diat each de�-eloper construct,either inclit-idually or in conjunction u-ith other de�-elopers,a traffic signal and eastbound and�vestbound left-turn lanes at SR 900/148th A�-enue SE.These unpro�-ement u�ere recently constructed b�Cam��'est Development �de�-eloper of Shamrock Heights and East Renton).T11e traftic si�nal«-as acTivated (turned-on) in n�id-October 20U?. Traffic 1lofumes :�ttachment 3 illustrates etisting:�:'l1 and Phf peak hour traftic�-olumes at SR 900/148di A�-enue SE. Traftic�-olumes «-ere collected in mid-No�-ember 200?,appro�cimatel��one month after the traffic signal�vas acti�-ated. ��'e rounded these��olumes to the nearest fi�re vehicles since traffic voliunes Eluctuate da��-to-da�-. �Y'e estimated future (2010) �i�ithout-project A�i and P�i peak hour traffic�-olumes b�-increasing etisting traffic b�an a�-erage annual grourth rate of 1 percent for three�•ears �uid adc�ing traftic attributable to tive Count�-"pipeline"projects,uicluding Acter Park,East Renton, Rosemonte, Shamrock Heights, and Stoneridge. "Pipeline"projects are defiiied as iuture de�°elopmerit projects �rithin the site vicinih-that ha�e a�-alid development permit application and/or appro��al. The a�-erage ,ulnual gro«-th r�te is based on the increase in P�I peak hour traEfic at SR 900/148th 1��-enue SE benveen 1999 and 2007. It«•as assuined that this gro��-th rate t�-ould be representati�•e of uicreases in borh��I and P�i peak hour traf£c. _�ttachment 3 illustrates 2010�rithout-project_�li and PI1i peak hour rraffic i-olumes at SR 9�0/148th A�-enue SE. Like e�isting traftic�-olumes, furure�-olumes «ere rouilded to the nearest fit-e �-ellicle�. Traffic C}perations "I11e operational characteristics of�ui intersecaon are determined bv calculating the intersection's level of ser�-ice (LOS). The uitersection as a�z�hole and its indi�-idual turning mo�-ements c,u►be described alphabeticall�•u-ith a range oi le�-els of sen-ice (A through F),�t-ith LOS 13 indicaring free-tlo�v traffic �uid LOS F indicating congestion and long eehicle dela�-s. LOS is measured in a�-erage dela�-per �-ehicle �uld is t��pic:ill�- reported E<�r the intersecti<�n a� a ��•h<�le �ir�i�naliz.ed ii�ter�ecrions. � l��r. Greg Strong T��,�� December 18, 2007 _._�..._.._.�� Page 3 of� E�isting and future��-ithout-project levels of ser�-ice,delaS-s, and�-olume-to-capacitt- (v/c) ratios�vere calculated at SR 900/148th Avenue SE based on methadalogies contained in the Hi�hr�.�aj�Capucrly �jlcinual(Transportation Research Board, 2000). SJ�ntjim(a. G.0) ��as used for these calculations. Table 1 illustrates the results for the weekda�-.��I and P�f peak hours. Detailed LOS u-orksheets for both etisting and future��-ithout-project conditions are attached. Tabfe 1. Existing and Future Withoui-Project Peak Hour Intersedion Operations AM Peak Hour PM Peak Hour Intersection LOS' DelayZ V/C' LOS Delay V/C SR 900/148'"Avenue SE Existing (2007) B 13.6 0.57 B 12.8 0.47 2010 Without-Project 6 16.5 0.66 B 1 5.Z 0.53 1. Level of service,based on 2000 Highway Capacity Manual methodology. 2. Average delay in seconds per vehicle. 3. Volume-to-capacity ratio. Based on the InlerlocalAgreenreitt behz�een Iiing Countt-and the��'ashuigton State Departmeiit of Transportation (��4'SDn"I),LOS E or better is considered an acceptable intersection operation at this lacation.�s illustrated in Table l, ewistu�g traftic�-olumes opei�te at LOS B di�ring the ADI and PRi pelk hours. Like�vise, b�-2010,r�I�i atid P�i peak hour traftic�-olumes«�ould operate at LOS B. T1lerefore, the intersection of SR 9i}0/148th A�-enue SE currentl��operates acceptaUl}�,and�vill continue to oPerate acceptable,duruig d�e«-eekda�-peak hours. Traffic Safety Traffic accident records at SR 9Q0/148th Avenue SE were obtained froin��'SDOT for the period betu-een JanuarF� 1,2U04 and December 31,2006.Tl�ese records represent the most recent three-year period for«-hich complete accident records are a�-aiLlble.��'ithifi this time period,three accidents u-ere reported at SR 900/148th A�-enue SE ui 2004,eight ui ?00�, and eight ui 2006. �11 accidents reflect unsignalized conditions and none of the reported accidents resulted ui a fatalitt-. On aE-erage, appro�matelS-C.3 accidents�er�•ear�t�ere reported at tl-us location. Tlus intersection is not classified b��!i'SDOT as a hazardous accident location (Hr1L) nor is it lacared��itlun a�X'SDOT-detined high accident corridor (HAC). Trip Generation `�'e estimated peak hour project trip generation based on the size of the project and a�-erage trip rares published by the Institute of Transportation Engineers (ITE) in Trzp Generation �`'' Edition, ?OC}3) for single-fainil�-detached housing (Land Lse Code No. 210).This information is based on hundreds of trip generation studies of single-tamil��residenrial de�-elopments in the Lnited States and Canada. t1t 27 unit5, �ve estimate that the proposed project��ould generate 20 vehicular trips during the f1Af peak hour and 27 vehicular trips during the PI�i peak hour. � l�Ir. Greg Srrong ��''� � December 18,200? ___.____�p___ Page4ofa � Tri� DistrEbut�at� and Assigt��n�� Etisting tra�-e1 patterns in die area«�ere used as a basis to distribute project traftic. For esample,�ve estimated dlat approa:imateh-three-quarters of project traftic u-ould travel to/from the intersection of SR 900/148th r1�-enue SE. Of this traffic,a-e estunated dlat approaimately �0-6� percent of project traffic�;�ould tra�el to/from the north,20-30 percent to/from the�-est,and 1�-20 percent to/from the east, dependu�g on the peak hour.Based on t�iese percentages and our trip generation estimates, site-generated traft7c�t-as assigned at dle SR 900/148th��•enue SE intersection.�ttaclunent 3 illustrates this assi�unent as well as 2010��ith-project:��1 and Pl�peak hour traffic�-olumes. Project Impacts The follo�ving summarizes potential project-generated impacts at SR 900/148d1 r��•enue SE with respect to traffic volumes,traftic operations, and rraftic safen�. Traffic Volume Impacts �t'e added peak hour project traffic�olumes to 201U�vithour-project pe11:hour�-olumes.The resulting 2�10��-ith-project peak hour traftic�-olumes are illustrated in Attachment 3. During bodz the ��i;uld P11��eak hoi�rs,project traffic�rould represern appra�imarel�• 1 percent of 2010��-irh-�roject traftic�-olumes. Traffic Operations I3ased on methodologies contained in the Hi�b��u�}�Cnpa�il��lfanunl,2010 u-ith-projert le�-els of ser��ice �t-ere calculated for pe� hour conditions. �'e determined that��irh project traffic, the inteisection of SR 900/148th A�-enue SE would continue to operate at LOS B«Tith less dian one second ot additional a�-erage dela�during the AI�f and P�I peak hours (det�uled LOS�vorksheets are attached). The applicable intersection standard is LOS E or better and therefore,the anticipated pe�;k hour intersection operation��-ould ineet this requireinent. Traffic Safety SR 900/14$th ��-enue SE is not classitied 6�-��'SDOT as a H_�L nor is it located t�-itlun a��-SDOT- detined HAC. Traffic generated b�-the proposed project u�ould likelv result in a proportionate increase in the probabilit4 of accidents at tlus location. It is ucilikel�•, ho��-e�-er,th�t tlus traffic (representing approsimatelF 1 percent oi 2010�i-ith-project peak hour traffic�-olumes)�t-ould create a safen-hazard r�r significantl�- increase the number of re�orred accidents. M itigation Measures � ��'e identified mitigation measures in our earlier technical lerter dated Julj� 1%,2007. These measures � included pa�-ment of Iting Coiulh's�1YS Eee and a pro-rata share to C�un\�est in ;ui amotuit , �ropnrrional r�� rhe im�acrs c�f the pr<��o�ed de�-elopinent T1�e�otenri�il traftic-rel;ited iinpacts at ', � Rir. Greg Strong Tr�ns � o �e�emver i a,aoo� _ _.__�_p__ Page � of5 � SR 900/14Sth A�-enue SE�vauld not require adclitional mitigation measures be��ond rhose idenritied pre�-iousl�-. Please contact me at(425) 821-3GG7 or I�e�-in�;TlieTrans�oGrou�.com should y�ou haee an�- questions or require adclition,il inforination. Sincerel�, T1ie Transpo GrouP, Inc. 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('1(3) (��J� ��15�� 21(3)�� . 3 .�_..__.�. ......... ��. ;ti. ,,.,,.,,.__ , ,_�__ ..m.,�. „_.�� .m,.d.�._Q , _.,..�.._�....._..�..�... s (3� r ��) (370)3 0! �(63)51 � 21(26) (4)2� y 9 (119)47� � 319 � (4) � (79) F � � LEGEND � (PM) AM Attachment 3 T� Existing and Future Peak Hour Traffic Volumes at SR 900/148th Avenue SE T�� _ _. _ ___.. — Delaney PArk Subdivision _ ____ __ _ _ GfoUp ', M:1071D7018 Delaney Paric SubdivisionlGraphicslDelany Park Subdivision graphic 1<Att�2>melindap 12I18107 09:24 - - - _____ _1__-- _----__ � Timings HCM Signalized Intersection Capacity Analysis � 2:SR 900&148th Ave SE Exisling-AM Peak Hour 2�SR 900&148th Ave SE Existing-AM Peak Hour � -� � �- -� t `► 1 � � � � `- � � t � �► 1 � LtiineGrouP : _..,.;�-,�61».,.�T N1�7L ;.�3T' ht81,.. .N�1"'::��8�......-S$�,:,�r..a _ Mnu�meii[... .."!, .,.EBL =�EB'f��Afi'. .VVM'�L,....YyAT.��.�1�,�==M87'._..NBF3::".,$QC.u�,"�uBT....,.:a6Fi Lane Contigurations '� � � � r'{� r� Lane Configurations � '�. � '� .j� .T+ Volume(vph) 55 360 15 320 35 225 5 15 „ _ IdeaiFlow(vphpp '1900 1900 1900 1900 1900 1900 1900 iBaO 1900 1900 1900 t900 Lane Group Flow(vph) 58 411 16 353 0 290 D 58 � Total Losl time(s) 4.0 4.0 4.0 4.0 4 0 4 0 Tum T Prot Prot Perm Perm s-'"" `z > Lane Uiil.Factor 1.00 1.00 1.00 1.OD 1.00 1.W YPa �c��'�_ Protected Phases 5 2 1 6 8 4 Frt 1.00 O.�J9 1.00 0,99 O.�J9 0.91 Permitted Phases - 8 4 �;�;��;.;'; PIt Protected 0.95 t.DO 0.05 1.00 0.99 1.00 Oetector Phases 5 2 1 6 8 6 4 4 Satd.Flow(prot) 1fi41 1707 1687 1764 1874 1695 �i Minimum Initiei(s) 5.0 10.0 5.0 10.0 SA� SA � 5.0 5.0 -.�.��` . ��'"�_.'��.: Flt Permitled 0.85 1.�0 0.95 1.OD 0.96 0.96 '� Minimum Split(s) 20A 20.0 20A 20.0 20A 20A 20A 20.0 Satd.Flow(perm) 1647 1707 1FiA7 1764 1803 1640 '� Total Spiit(s) 20.0 20A 20.0 20A 20.D 20A 20.0 20.0 ,"k�y�,,�3�;,";�+,�;it•- ' Volume(vphj 55 380 30 15 "320 15 35 225 15 5 75 35 Total Split("/1 33.3% 33.3% 33.3°!0 33.3% 33.3% 33.3% 33-3% 33 9% � Peak-houn c�tor,PHF 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 Yelbw Tirne(s) 4A 5.0 4.0 SA .4.0 4.0 4.0 4A ' '"��""`"`"` " �� `�j�*;`„�.�:;','- Adj.Flow(vph) 58 379 32 16 337 16 37 237 i6 5 16 37 All-Red Time(sl 1 A 1 A 1 0 1.0 1 A 1.0 1.0 1.0 RTOR Reduction(vph) 0 4 0 D 3 0 0 4 0 0 27 0 LeadlLag Lead ; Lag Lead Lag '-�`'��";-'.' Lane Group Flow(vph) 58 407 0 18 35D 0 � 286 0 0 31 0 Lead-Lag Optirnize9 Yes Yes Yes Yes � � �� Heavy Vehicles(%) 10% 10°6 10% 7% 7% 795 096 0°6 0% Zo�� po�� Zg6 Recall Mode None Min None Min Min Min Min Min ��;, „ Tum Type Prot Prot Perm Perm v!c Ratio 021 0 51 OA� 0 55 0.55 0.12 Protected Phases 5 2 1 6 B 4 Conhol Delay . 20.5 13.0 232 18.6 1B.2 B.5 �"'"'',�,.�m� _ _.. Permitted Phases . 8 �4 Uueue Delay 0.0 0 0 OA OA 0.0 0.0 Acivated Gree.n,G(s) 42 18 4 1.1 15.3 11.5 11.5 Total Dela 20.5 13A 23.2 18.6 18.2 8.5 ' � ""' Y 1 Eftective Green,g(s) 5,2 20.4 2.1 17.3 12 5 12 5 Uueue Lengm 50th(ft) t5 59 4 85 71 4 Aduated g/C Ratio 0.11 0.43 OA4 0.37 027 0 27 . Oueue Lenglh 95th(ft) 42 #226 18 k201 141 � 26 '` �"�� ,;�"�.,�;� C�earance Time(s) 5.0 6.0 5.0 6A 5A� � 5.0 � Intemal Link Dist�ft) 179 197 340 364 Vehicle E�Rension(s) 3.0 3.0 3.0 3D 3.0 3A . Turn Bay length(ft) . .. ..... . � ::'.�„�g�„��;rv�?:,i:• '+� Lene Grp Cap(vph)� 182� 741 ... . 75 fid9 480�:. . .� 436 �� ase Capacity(vph) 475 833 452 670 636� 601 v/s Ratio Prot c0.04 c024 0.01 020 � Starvation Cap Reductn 0 0 0 0 0 0 "�+„�'��"`rr ,. v!s Ratio Perm c0.16 0.02 Spillback Cap Reductn 0 0 0 0 0 0 v/c Ratio 0.32 0.55 021 0.54 0.60 0.07 Slorage Cap Redudn 0 0 � 0 0 0 ' '' Uniform Delay,d1 19.3 9.9 21.7 11.7 _ 15A 12.9 Reduced v/c Ratio 0.12 0.49 0.04 0.53 0 46 0.10 Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 - Incremental Delay,d2 t.D 0.6 tA 0.9 2A D.t Intt�r's�aliorr-�um41}atSl._.�� ..... _ 1. _ �� "�� : . Delayls) 20.3 107 231 12.6 17.0 13.0 � Cycle Length�60 . . Actuated Cycle Length:A3.7 Level of Service C 8 C 8 �`��=�� B B ' Natural Cycle�60 Approach Delay(s) 11.9 13 1 17A 13.0 Control Type:Actuated-UncooYdinated Approach LOS 8 B B B # 95th percentile volume exceeds capaciry:queue may be longer. , Intersection Summary � � � � "�µ �'�� .. �� -�.i� __:;� � . -... ....,:.,... ._,,.,... Queue ahown is maximum atter hvo cycles. .. . . �� .. . � - HCM Averac�e Conhnl Dr.lay 13 G HCM Level of Service . B � �� HCM Volume lo Capacity ratio 0,'i7 S lits and Phases�. 2�.SR 900&148fh Ave SF Actuated Cycle Length(s) 47.0 Swn ot losl time(s) ��12.0.: � . . �01 -►'e2 "ed Intersection Capacity UlilieaGon Sf.3% ICU Level of Serwce B Analysis Penod(min) 15 . - . � c Critical Lane Group ', e5 e6 �� m8 � M:\07\07018 Delaney Park Su6division\LOS\Existing\07018 existing AM.sy7 M�.\07107018 Oeianey Park Subdivision\LOS1ExistingY07018 existing AM.sy7 The Transpo Group Page 1 The Transpo Group Page 2 II -----_ ----_ ____ _ i �--_ ___- I I Timings HCM Signalized Inlersection Capacity Analysis 2:SR 900 8 148th Ave SE 2007 Existing-PM Peak Hour 2:SR 900 8 148th Ave SE 2007 Existing-PM Peak Hour � � � ~ � t � 1 � � � � ~ � � t � `► 1 -' Gar�@Group'' ''.�91"�E�T.. S�iBL:::.�Y�H7..:1�8L�;"'NBT,:S84 :SBT_ ..._.s_a � Mrrvement '''s":....�.EBL_ :F,�T`.: ��1� Vv�4�,aVs�g1`.��'�„N�wN��'.:,N6R�,`�BL.,:i'88T .:$� Lane Configurations � j� � f. � .fi Lane Configurations � F � � sfs eTr Volume(vph) 35 380 40 500 35 45 10 115 „ r ldealFlow(vphpp 1900 1H00 1900 1900 1900 1900 1900 1900 1900 18p0 1900 1900 Lane Group Flow(vphj 36 438 41 520 0 97 0 147 Total Lost time fs) 4.0 4.0 4 0 4 0 4.0 4A I 7um Type Prot Prot Perm Perm _�„��;..: Lane Utii.Factor 1.00 1.00 1.00 1.00 1.00 1.�0 �i Protected Phases 5 2 1 6 8 4 Frt 1.00 Q98 1.00 1.00 0.98 0.98 I Permitted Phases 8 4 ,��'�i�,;;: Fit Proreded 0.95 1.00 0.85 1.00 0.98 1.00 I� Detector Phases 5 2 1 6 8 8 4 4 Satd Row(proq 1770 1817 1770 1857 1791 7840 Minimum Initlal(s}� 5.0 10.0 5.0 10.0 5.0 5.0�� 5.0 5A � ':��,:�:.-. Flt Permitted 0.85 � 1.00 0.85 1_00 087 � 0.96 Minimum Split(s� 20.0 20A 20A 20.0 20.0 20.0 20A 20 0 Satd Flow jperm) 1770 1817 1770 1857 1585 18U1 � Total Spiit(s) � 20A 20.0 20A . 20A 20.0 20A�� Z0.0 20A �� `� � ��,��;:" Volume(vph) 35 360 70 40 500 10 35 45 15 10 115 20 Total Split(%) 33.3% 33.3% 33.3% 33.3% 33.3% 3�.3% .3�.3% 73 3% Peak-houn c�tor,PHF 0.98 Q98 0.98 0.88 0.98 0.98 0.98 0.98 0.98 0.98 0.98 0.98 Yellow Time(s} �� 4.0 5.0 4.0 5.0 4.0 4.0 4.0 4A `� ��;��:- �.' Adj.Flow(vph) 38 367 71 41 510 � 10 36 �46�� 15 10 117 20 , NI-Red Time(s) 10 1.0 1.0 1.0 1.0 1.0 1.0 1 A RTOR Reductian(vph) 0 10 0 0 1 0 0 12 0 0 10 0 , Lead/Lag Lead Lag Lead Lag ��.";."�:` Lane Group Flow(vph). 38 428 0 41 519 0 0 85 0 0 137 � 0 ��, Lead-Lag Optimrze? Yes Yes Yes Yes Heavy Vehicles(%) 2% 20;o p��o pqo z� z� 2ga p�o y�a �qa �o� �o.,, I Recall Mode None Min None Min Min Min .Min Min � °��"�-�,��_.;:` Tum Type Prot Prot Perm Perm I v/c Ratio 0.72 055 0 14 0 64 025 D.33 Protecled Phases 5 2 1 6 8 4 Control Uelay . . 18.1 15.1� .18.1 18.0 13.6 14.8 .,,��. "�r,�;�,,��"�� ''�� *;':;�. Pertnitted Phasos 8 4 � Queue Delay 0.0 0 0 0.0 0.0 0.0 0 0 Adualed Green,G(s) 2.4 14] 2.5 14.8 8.4 BA Total Delay 10,1 15.1 18.1 18.0 13.8 14.8 , ,�,� ° �;`:;' Eftective Green, g(s) 3A 16:7 3.5 16.8 9,4 94 Queue Length SOth(ft) 5 41 6 53 11 18 Aduated g/C Ratio 0.08 0.40 0.08 0.40 023 023 , Queue Length 95th(ft) 28 #236 31 #301 49 70 _ "�� ,�'1��?:.'; Clearance 7ime(s) 5.0 8.0 5.0 6A 5.0 5A Internal Link Dlst jft) 779 1�J7 340 364 Vehicle Extension(s) 3D 3.0 3A 3.0 3.0 3A Tum 6ay Length(ft} �� = Lane Grp Cap(vph) 145 729 149 750 358 407 � 8ase Capacity(vph) 530 799 531 811 578 683 v/s Ratio Prot 0.02 0.24 c0A2 c026 i, Starvalion Cap Reductn 0 0 0 . � 0 0 0 .�. ��"..� v!s Ratio Perm � 0.0.5 � c0.09 � Spillback Cap Reducin 0 0 0 0 0 0 v/c Ralio 025 0.59 028 O.fi9 Q24 0.34 Storage Cap Reductn 0 0 0 0 0 0 :'' Unifortn Delay,d1 17.9 9.8 17.9 10.3 13.2 13.5 Reduced v/c Ratio 0,07 0.55 0.08 0.84 0.17 0,22 Progression Factor 1.00 LOU 1.00 1.00 1.00 1.00 lnfefsection`6ummary.�:� ;;„ Incremental Delay.d2 0.9 1.2 1.0 2.8 ' 0.3 0.6 i Cycle Length�60 Delay(s) 16.8 it0 16.9 13.0 13.5 14.0 Actuated Cycle Length:38.6 Level of Service B B B 8 B 8 �� Natural Cycle�65 - �� - � � Approach Delay(s) 11.6 13.5 13.5 14.0 ��, Control Type:Actuated-Uncnordinated . _ Approach LOS . [3 Ei B B . . `' .....�.,.,:... . .: �._ '�, # 95th percentile volume exceeds capacity-queue may be longer. Intersedion SUmmAry - � �� - , : . . -., � .. - s. ...... , .,:... * Queue shown is maximum after two cycles. � . '. „_,�,� , ,� ��.... .�..�� HCM Average Control Delay � 12.8 FiCM Level of Servicr. B � . . � � HGM Volume to Capadty ralio Q47 S lifs and Phases� 2�SR 900&148th Ave SE Actuated Cycle Length(s) 41.8 Sum of losi timr.(�) 8,0 . . . .. ..,., j �e1 '-►e2 i'"�mA Intersection Capacity Utilization 55.9% ICU Level of Service B �, ,.�, Analysis Pedod(min) 15 � � �� , +, c Critical Lane Group �� , 05 06 ...� m6 M:107107018 Delaney Park SubdivisionlLOS\07018 existing PMsy7 M�\07t07018 Delaney Park Subdivision\LOS\W018 existing PM.sy7 � II The Transpo Group Page 1 The Transpo Group Page 2 , �-_ -- ---- -----._. _ -_ _.-- .___ � _ --- - _ __ _ _ _ __ i I Timings HCM Signalized Intersection Capacity Analysis I 2:SR 900&148th Av2 SE 2010 Without Project-AM Peak Hour 2:SR 900&148th Ave SE 2010 Wfthout Pro�ect-AM Peak Hour ' � -� � � � t `- 1 � --. � � � ` � t r � 1 -' _. ��C�.Giroup"':' ;':,��:.; �E47..WBL..:�B7,,......t+}BL.....NB7,..,sSBL S8T .. "'"��"',�'S�s��_.::� �taveinent _... � .;�,.�.�BL-��BT.,,. ._-".1M�L- �,. -:��.Nf�,"`1+18� `�" ;�, ., ! Lane Configurations � ja � j► .f+ .f. Lane Configuralions � 'N ►� f� � rj�� i Volume(vph) 60 370 20 330 50 310 5 30 IdealFlow(vphpq 19Q0 1900 1900 1900 1900 1900 1900 1900 1900 '1900 1900 1900 ', Lane Group Flow(vphj 63 436 21 363 0 400 0 90 Total Losl time Isj 4A 4 0 4.0 4A 4.0 4.0 ��. Tum Type . Prol Prot Perm Perm - ,,,„q�{�;,�.,�'„„;��. Lane Util.Factor 1.00. .1.00 1.00 1.00 1.00 � � 1.00 � ,' ��, ProtecledPhases 5 2 1 6 8 4 Frt 1A0 0.98 1.00 0.�9 0.99 0.92 ' Perrttitted Phases 8 4 ��j ° �,, Flt Protecfed �.95 1.00 0.95 1.00 0.99 �.00 �I Deleclor Phases 5 2 1 6 8 6 4 4 Satd Flow(proq 1641 1699 1687 1764 1674 1710 Minimum Initiat(s) 5.0 10A ��5.0 10.0 5.0 5A.. 5.0 6A �:.� ;��"�,�.. Flt Permitted � 0.85 1.OD 0.85 .1.00 0.95 0.98 Minimum Split(s) 20 0 20A 20.0 20.0 Z0.0 20.0 20.0 20.0 Satd Flow(perm) 1641 1699 1687 1764 1788 1679 . Total Split(s) 20 0 20A 20.0 20A 20.0 20A 20.0 ZOA "" , A;, Volume(vph) �0 370 45 20 l 330 15 50 370 20 5 30 50 Tofal Spli[(%} 35.9% 33.3% 33.3% 33.3% 33.3% 33.3%, 33.3% 33.3% Peak-hour factor,PHF 0.95 0.95 O.�JS 0.95 0.95 0.95 0.95 0.95 0.85 0.95 0.95 0.95 Vellow Time(s} 4A 5.0 4.0 5.0 4.0 4A �4.0 4A �.. ;-�� ,;::� AdJ.�Flow(vph) 63� 389 47 21 347 18 53 328 � 21 5 32 53 �� All-Red Tirne(s) 1 0 1 0 1 0 1.0 1.0 1.0 1.0 1.0 RTOR Redudion(vph) 0 F 0 0 3 D 0 4 0 0 38 0 i ��, LeatllLag Lead Lag Lead Lag ;��,�°„'"'�"�",'�_: Lane Group Flow(vph) 83 430 0 21 360 0 0 396 0 0 52 0 �., �i Lead-I..ag Optimize7 Yes Yes Yes Yes Heavy Vehicles(%) 10°io 10/ 10% 7% 7% 7°6 0% 0% 0% 2% 296 296 � Rerall Mode None Min None Min Min Min Min Min :.�q f�yx�`�>;'�.� Tum Type Prot Prot Perm � Perm v/c Ratio 0 23 0 56 0 09 0 5A 0.71 0.16 Protected Phases 5 2 1 6 8 4 Control Delay 21.1 14.8 23.7 20.2 24.8 � 8.5 ,:, ?�,��?��;�',�'T P; ,f�� Pertnitted Phasea 8 �. 4 Queue Delay 0 U 0 0 0 0 OA OA OA qctuated Green.G(5) 4A 19.1 1.3 16 0 13.5 13.5 Total Delay 21,1 14.8 23.7 20.2 24.8 8S r„„��,.�,�b,��,�' ; Eftective Green,g(s) 5.4 21.1 2.3 18.0 14.5 14.5 Oueue Length 50th(tt) 17 71 � 6 55 107 8 Actuated g/C Ratio 0.11 0.42 OA5 0.36 029 029 Queue Length 95th(ft) 44 #251 22 �t271 #241 35 g'��.a�.; Clearance Time(s) 5.0 6.0 5.0 6.0 SA 5A Internal Link Dist(ft) 179 197 340 364 Vehicle Extension(s) 3.0 3.0 3.0 3A 3A 3 0 ' Tum Bay Length(ft) _ _ Lane Grp Cap(vph) 178 718 78 636 520 488 � Base Capacity(vph) 454 794 431 633 616 610 v/s Ra�io Prol c0.04 c025 0.01 020 ; Starvation Cap Reducfi 0 0 0 0 0 0 .,„„:�`' v/s Ratio Perm c0.22 0.03 �� P P � v/c Ratio 0.35 0.60 027 0.57 076 0.11 S illback Ca Reductn 0 0 0 0 0 0 � Storage Cap Redudn 0 0 0- 0 � D D ;:�:.�� . ' �� Unifarm Delay,d1 20.6 11.1� � 23.0 12 6 � 18.1 � � 13.0 I Reduced v/c Ratio 0 14 0.55 0 05 0.57 0.65 0.15 Progression Fador 1.00 1 00 1.00 1.00 1.00 1.00 � ��ty��G�n��, : �,,, Incremental Delay,d2 12 1.4 1.9 �12 � 6.5 D.1 Cycle Lenglh:80 Delay(s) 21.8 12 5 24.8 14 0 22.7 13.1 � Actualed Cycle langth;46,2 W � !- Level of Service C B C B C B . Natural Cycle 65 � ... ... .,��': ..��....��...-. APProach Delay(s) 13 7 14 6 22.7 13.1 . ConVol Type:Actuated-Uncflordineted . �'� k , . �'��.�;.� ApProach LUS 6 B C 6 , # 95th percentile volume exceeds capacity.queue may be longer. Intersedion Summery `- ' ��` I Queue shown is maxfmum after two cycles. � � � �� . .. � � . HL'M Average Controi Del2y 18.5 HCM Level of Senwe .. .. �_B- HCM Volume ro Capacity raho 0.66 S lits and Phases�. 2 SR J00&148th Ave SE Actuated Cycle Length{s) 49.y Sum of lost time(s) � � -.�'�.12.0 `ot � �e2 i" 04 Intersection Capacfty Utilization 63.3'% ICU Level of Service 8 . Anatyais Petlod(min) 15 . „ ... �, c Critical Lane Group �I � e5 a6 �� Q9 M:\07107018 Delaney Park Suhdivision\LOS\Baseline107018 Base AM.sy7 M�.10 710 70 1 8 Delaney Park Su6divisionYLOS\BaSeline1070t8 Base AM.sy7 The Transpo Group Page 1 The Transpo Group Page 2 � ___ -- __ _-__-- .. - � Timings HCM Signalized Intersection Capacity Analysis 2'SR 900&148th Ave SE 2010 Without Project-PM Peak Hour 2:SR 900&148th Ave SE 20t0 Without Project-PM Peak Hour �I � --. � '- -� t �• 1 � -• � � ~ � � t � � 1 -' L�rr�'�ro�p' .::::�L:�;;E.�7. W�i:':;WdT =NH� ..,N�T .°�Bk��:,;�1Qt ,':,; -:-. �:;< ;'�Bl" :E�T.�:��f�, tNBL-tAlBT ::µ "";:: :� :-'��E�""��'T'��:�.8� lane Configuralions � js � � af� «j. Lane Configurations � j. � j� � � I� Volume(vphj 65 370 60 515 60 75 15 170 IdealFlow(vphpq 1900 1900 1900 190D 1900 1900 1900 1900 1900 1900 1800 1900 � Lane Group Flow(vph) 56 495 61 536 0 164 0 219 Total lost time(s) 4 0 4A 4 0 4.0 4.0 4 0 Tum Type Prot Prot Perm Perm ..;��j��;:..":; lane Util.Factor t.DO 1.00 �.o0 1.00 1.00 1.00 Protecled Phases 5 2 1 6 8 4 Frt 1.U0 0.96 1.OD 1.00 0.98 0.98 I Permitted Phases 8 � � 4 ,'�,��-�,,,'��,'�;"','`� Flt Protected . O.BS 1.00 0.85 7.00 � . �.98� 1.00 �� Detector Phases 5 2 1 6 8 8 4 4 Satd.Flow(prot) 1770 1797 1770 1858 1790 1839 ', Minimum Initial(s) 5.0 10.0 .. 5A.�. 10.0 5.0 5A 5.0 5A '�. ,,;,,��'y��;;-',�, Flt Permftted 0.85: 1.00 . . Q95 1.00 _ . .� 0.81 . 0.97. . � Minimum Split(s) 20.0 20A 20.0 20.0 20.0 20A 20A 20.0 Satd Flow(perm) 1770 1797 1770 1858 1483 1792 � Total Spiit(s) . .� .. 20.0 20A �.20A�. 20.0 20.0 20.0 20A � 20.0 ,„,x�y,,,�, +F,"�r . Volume(vph) ��.55��:� 370 115 � 60 515. 10 60��. 75�.� 25 15 . .17D.:. 3D Total Split(%1 33.3% 33.3% 33.3% 33.3% 33.3% 33.3% 33.3% 33.3% Peak-hour factor,PHF 0.98 0.98 0.98 0.98 0.98 0.88 0.98 0.98 0.98 0.9B 0.98 0.98 �', , Yellow Time{s) 4A 5.0 4.0 5.0 4.0 4.0 4.0 4A ,�..�. �.^�„r"?�,,,;"��"."��.,",�; i` Adj.Fiow(vph) ..58 .. 378 117 61 528 10 61 � 77 26 15 � �173 � 31 � � All-Red Time(s) 1 0 1 A t A 1.0 1.0 1.0 1.0 1.0 RTOR Reductian(vph) 0 15 0 0 1 0 0 11 0 0 10 0 , leadllaq Lead Lag Lead Lag „_ "'�;.;,.. Lane Group Flow(vph) 58 a80 0 81 535 0 0 153 D 0 209 0 �� Lead-Lag Optimize? Yes Yes Yes Yes Heavy Vehicles(°/) 2% 2°/ 2°0 2°6 2°'o Z°'o 2% 2% Z% 1% 1°!0 1% ' Recall Mode None Min None Min Mln Mi� ANn Min �.��:�� Tum Type Prot Prot Pertn Pertn � v/c Ratio 0 19 0 f9 0 20 0 65 0 41 OA6 Protected Phases 5 2 1 8 8 4 Control Delay 20.9 22.1 1BJ� 20.5 17.0 17.5 �.:; ��.��"�`�`':,_..:: Pertnitted Phases � � 8 . 4 .. Queue Delay 0.0 0.0 0.0 0.0 0,0 0.0 Actuated Green.G(s) 2.8 15.6 42 17.0 10.1 10,1 Total Delay 20.9 22.1 19.7 20.5 179 17.5 � nw '�p$�'��••' Effective Green,9(s) 3.8 17.6 5.2 19A 11 1 11.1 Dueue Length SOth�tt) 14 114 15 71 35 48 Actuated g/C Ratio 0.08 0.38 0.11 0.41 024 024 �ueue Length 95tb(ft) 40 #308 43 #346 81 103 ` s"�,. Clearance Time(s) 5.0 6.0 5.0 6.tl 5A 5A �, Intemal Link Dist�ft} 179 197 340 �64 Vehicle Eutension(s) 3.0 3.0 3A 3.0 3 0 3 0 ', Tum Bay Length(ft) ��, ��u... 'i�� r� Lane Grp Cap(vph) 147 689 201 789 359 . 493 �i Bese Capacity(vphl 495 718 513 822 522 621 v/s Ralio Prol 0.03 027 c0.03 c029 Starvatlon Cap Reductn D 0 0 0 0 0 ,, �, „ ��i v!s Ratio Perm 0.10 c0.12 Spillback Cap Fteductn 0 0 0 0 0 0 v/c Ratio 038 O70 0.30 OJO 0.43 0.48 Storage Cap Radudn 0 0 0 0 0 0 Uniform Delay,d1 19.9 11.9 18.7 t1.1 14.7 14.9 Reduced v/c Ratio 0.11 0.69 0.12 0,65 0.31 0.35 Progression Faclor 1 AO 1 00 1 00 L00 1 00 1 00 �h��;ll��,�; �,,,„ �ncremental Delay,d2 �� 1.6 3-1 � � 0.9 ��2.7 0.8 Q9 __ Cycle Length:80 Delay Is) 21.6 15A 79.5 73.8 15 5 15.6 Actuated Cycle Lengtb:43.3 Level of Service C B B 8 8 B �' �`�. .`"'" `.'";"""'""....:�` .' '....'::',- -�� Approach Delay(s) 15 G 14.4 15.5 15 8 � Natural Cycle�.85 , Co�trol Type;Actuated-Unwordinated , . � Approach LOS B B B B ' fk 951h percentile volume exceeds capaciry,queue may be longer. � � Infersection Summary� � . . . ... . . w� � ._..._.... ..s. , . _.. �i Queue shown is maximum aftet lwo cycles. .... , .�.. ..� . ... HCM Averape Control[k�lay 15 2 HCM Level of Service . . B � � HCM Volume to Capacity ratio 0 53 j S lits and Phases 2 SR 900 8 148th Ave SE Actuated Cycle Length(s) 45 9 Sum of lost time(s) 8.0 � `.� �.Z �;:.:.� Inlersection Capacity Utiliza�ion Fi5.6"/o IGU Level of Service G Analysis Penod imin) 15 * c CriUcal Lane Group � , e5 ~06 �...I eb ! M\07\07018 Delaney Park Subdivision\LOS\Baseline107018 Base PM.sy7 M 107�07018 Delaney Park SubdivisionlLOS\Baseline107018 Base PM.sy7 � The Transpo Group Page 1 The Transpo Group Page 2 -- � I i Timings HCM Signalized Intersection Capacity Analysis 2:SR 900&148th Ave 5E 2010 YVith Projecf-AM Peak Hour 2:SR 900&148th Ave SE 2010 WRh Pro�ect-AM Peak Hour � -. � � � t � 1 � � � � ~ i -, t r `- 1 -' I I;afe►:+larqup ,.�:EHL.��.E�bT".W�t,,=t�V.lT"; hIB1. ::�1�T ='6�L:" �87 ._...., ,:�T MovamWm' __."..,EBL.mEBT .EBFiss W�I..,.'��,��1�."'�'NB.I'm_�NBR„.'„.,��.W.��T::.�R Lane Configurations � � � � r� .ra Lane Configuralions � f. � '� � e� Volume(vph) 60 370 21 330 51 319 5 31 _ ,_ _, IdeaiRow(vphpq 1900 1900 1900 1900 1800 1900 1900 1900 1900 1900 1800 1900 Lane Group Flow Ivphj 63 438 22 363 0 412 0 91 � Total Losl time Is) 4 0 4.0 4.0 4.� 4A 4.0 I Tum Type Prot Prot Perm . � Perm. ��.. �.;�"�-�"��=;,; Lane UtH.Factor � � 1.00 1.00 1.00 1.OD. . 1.00 � . 1.00 . � Protected Phases 5 2 1 6 8 4 FA 1.00 O.�JB 1.00 0,99 0.99 0.92 Perrrtltted Phases 8 4 .,�'`�,�.;:��*;�': Flt Protected 0.95 1.00 O.B5 1.00 0.99 1.00 Detector Phases 5 2 1 6 8 8 4 4 Satd.Flow(proq 1641 1698 1687 1764 1874 1712 '. Minimum Initial(s) 5.0 10.0 5.0 10.0 5.0 5.0 5.0 5.0 ,:j:q' �,��.;',; Flt Permitted 0.85� 1.00 . .. 0.85 1.00 0.95 . D.9B i Minimum Split(s) 20.0 20A 20.0 20.0 20A 20A 20A 20.0 Satd Flow(perm) 1641 1698 1887 1764 1789 16A0 Totai Spiit(s) 2UA 20.0 20A 20.0 20.0 20.0 20 0 20.0 „��,K,yF,��um�'y�,,y'„'; Volume(vph) 60 370 47 ' 21 330 15 51 319 ' 21 5 31 50 I iotal Split(%1 3�3% 33.3% 33.3% 33.3% 33_3% 33.3`% 33:1% 33.3% Peak-hour factor,PHF 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 � 0.95 0.95 , Yellow Time(s) 4.0 5.0 4.0 5.0 4.0 4.0 4.0 4A ... .�G,�y,�''q;'3�,,,;[ Adj.Flow(vph) 63 389 49 22 347 16 54 336 22 5 33 53 All-Red lime(sl 1 0 1A 1.0 1.0 1.0 1.0 tA 1.0 � RTOR Reductian(vph) 0 6 0 0 3 0 0 4 0 0 37 0 ', LeadtLag Lead Lag Lead Lag -;,,;��^�,wp��,3'�; Lane Group Flow(vph) 63 _432 0 22 360 0 0 408 0 0 54 p Lead-Lag Optirnize9 Yes Yes Yes Yes Heavy Vehicles(°/n) 10% 10% 10°6 7°� 74'� 7°'� 0°'e 0% 0% 2% 2% 2% Recall Mode None Min None Min Min Min Min Min �`��'�,�,'•S 7um Type Prot Prot Perm Perm vlC Ratio 0 23 056 0.10 0.58 072 0 16 Protecled Phases 5 2 1 6 8 4 Confrol Delay 212 15.0 23.7 20.3 25.5 8.6 "�"`�`" '� "'�s� . . :��. -��q�'x.:.. Pertnitted Phasea 8 4 � Dueue Delay 0.0 OA 0,0 OA 0 0 OA nctuated Green,G(s) 4.5 192 1.3 16.0 13.8 13.8 Total Delay 212 15A 23.7 20.3 25.5 8.6 w'�r�"�'3�^,��",� ;j Effective Green, g(s) � � 5.5 27.2 2.3 18.0 14.8� '14.8 vueue Lengih 50th�fq 17 72 6 95 111 8 Aduated g!C Re6o 0.11 OA2 OAS 0.36 029 0 29 �ueue Length 95th(ft) 44 #252 22 tt211 #252 . 38 - �� ;:- Clearance 7ime(s) 5A . 6.0 5.0 6.0 5.0 5A �� Intemal Link Dist�ft) 179 197 340 384 Vehicle EMension(s) 3A 1.0 3.0 3.0 3 0 3A ' Tum Bay Length(ft1 � . . . .. ,�� l,:;v�.��. .'�`�,-:m� Lane Grp Cap(vph) 179.. 716 77 831 528 . . 494 . 'I Base Capacity(vph) 451 788 428 628 613 609 v/s Ratio Prot c0.04 c025 OA1 02U � SfarvaUon Ca Reductn 0 0 0 0 0 � P o vls Ratio Perm c023 0.03 , �.: Spillback Cap Reductn 0 0 0 0 0 0 v/c Ratio 035 0.60 0.29 0.5? 078 0.11 ', Storage Cap Reductn 0 0 0 0 0 0 Unitortn Delay,dt 207 11.3 23.2 13.0 162 12.9 Reduced v/c Ratio 0.14 0.58 OA5 0,58 0.67 0 15 Progression Factor 1.00 1.00 1,00 1.00 1.00 1.00 ' (nferseai'uin�umnngt7�='�''� , _ Incremenial Delay,d2 � 1.2 1.4 2.0 1.3 7.7 � 0.1 Cycle Length�60 ...�.�.... .. Delay(s) 21.9 127 252 14.1 23.3 13.0 Actuated Cycle Length:48.8 I Level of Service C B C B C B Natural Cycle-.65 ��.. . ±�::.,�µ, .,�P .. : ��. PP Y( ) 13_9 14.9 23.3 13 0 A roach Dela s Control Type:Actuated-Uncoordinated � � � � a,�,"`"��.:,�5�.'w��n�'�u w�.ts;�w��,r:ti,„n,: Appraach LUS 8 k3 C � d �� .. r....,,.,. -.. ., i �', # 95th percentile volume exceeds capacity.yueue may be longer. . In4eranction SUrtttnary� �� - � � "�� " �� Queue shovm is maximum aftet lwo cycles. �� . �.. � . � �. � HCM Averape Control Uelay � � 18.9 HCM lrvel of Service v V Bµ � S lits and Phases: 2:SR 900 8 148th Ave SE HCM Volume ro Capaaty raho 0.67 I Actuated Cycle Le�gth(s) � 50.3. Sum of lost time(s} . . 129 � `01 "►e2 ♦'�`aq Intersection Capaciry U6lization 64.0% ICU Level of Service C � Analysis Penod(min) 15 � � .., .� � � c Critical LaneGroup 05 a6 � e8 .,,;�^�i ' od',, � M.\07107018 Delaney Park Subdivision\LOS\WProject107018 W Prq AM.sy7 M 107\07018 Delaney Park SubdNisionlLOS\W.Project\07018 WProj AM.sy7 The Transpo Group Page 1 The Trenspo Group Pege 2 _ ----- - _ _ --._. ---- _ _ - - -- -- _ . � Timings HCM Signalized Intersection Capacity Analysis II 2:SR 900&148th Ave SE 2010 With Pro�ect-PM Peak Hour 2:SR 900&148th Ave SE 2010 Wdh ProJect-PM Peak Hour II i � � � �- -� T `► 1 f --. � � ~ � � t t � 1 � � _. ._.,, �anec'.7ratla.-= _'�L,,:�-.EHT'.=VW�„ UV81'.:'.NBI.. NBT..`;86L".S men` :��"„ E��.--:;�eT-.; .._. L':��"..WBff.;`-,� . .'. T, 6�#" SBL--;:;�„m Lane Configurations � � � f� � .� Lane Configurations � f� � N � .j� Volume(vph) 55 = 370 63 515 83 79 15 176 ' Itleai Flow(vphpp ' 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 19�0 1900 �, Lane Group Flow(vph) 56 499 64 536 0 172 0 226 � Tolal Losl hme(s) 4.0 4.0 4 0 4.0 4 0 4.0 � Tum Type Prot Prot Perm Perm M�,�� =:--: Lane Utit.Factor ' 1.00 1.00 1.00 t.OD 1A0 s 1.00 ,.,. ..� Protected Phases 5 2 1 6 8 4 Frt 1.00 0.96 1.OU 1.00 0.96 0.98 I Perrrdtted Phases 8 4 ;„ " "`:"� ;;; FIt Protected O.BS 1.00 0.95 t.OD 0.96 1.00 �. Detector Phases 5 2 1 6 6 8 4 4 � Satd.Flow(prop 1770 1795 1770 1858 1790 1840 �' � Minimum initiel(s). . . 5.0- �10.0 5.0 10.0 5.0 SA � 5.0 5.0 , ��,;;� ,� � �_,_�. Flt Permitted 0.95 1.00 .. . 0.95 1.00 0.80 . 0.97 � Minimum Split(s) 20.0 20.0 20A 20 0 2Q0 20A Z0.0 20.0 Sa�d.Flow(perm) V70 1795 1770 1858 74f5 1794 Total Split(s) � 20A ��20:0 20.0�� 20A ��20.0 20A ��'20.0 2�.0 ,;:� � .�rc�"'�q'",��' ,;- ` Valume(vph) . � . �� 55 370� 119�� 63 . .515. . iD ��`��83 79�� 26 15�.��176 30 1-otal Split(%) 3�3°/n 33.3% 33.3% 33.3% 33.3% 31 3% 33.3% 33.3% Peak-houn c�to�,PHF 0.98 0.98 0.98 0.98 0,98 098 �0.98 0.98 0.98 0.98 0.98 0.98 i Yellow Time(s) . 4.0 5.0 4.0 5.0 4.0 4.0 4.0 4A �" �'�-r�,� , . Adj.Fiow(vph) 58 378 121 64 528 10 64 81 27 15 180 . 31 All-Red Time(s1 1,0 7.0 1 0 1.0 1.0 1.0 1.0 1A �� RTOR Reduction(vph) 0 �6 0 0 1 0 0 11 0 0 10 0 LeadlLag Leatl .� Lag Lead�. Lag . ..... . . ;��,n,,;�',�sz�'�,��t'�,�`,; Lane Group Flow(vph) 58�� 483 A... 84 535� 0 �� 0 161 -. D. .. 0 216 � 0 Lead-Lag Optimize? Yes Yes Yes Yes Heavy Vehicles(%)� 2^/ 2",� 2 j 2% 2% p/ ��po� pq�� 2q� 1% 1 g6 �1",'o Recall Mode None Mln None MHi Min Min�.� Mi� Min �""� '=" ' � �� ' ��..�s,'�aa�a�-�'�+�;= Tum Type Prot�� Prot Perm Perm , v/c Ratio 0 20 070 021 0.65 0 43 0.47 Protected Phases 5 2 1 6 8 4 '� Conhol DelaY . �. 21.1 22.7 19.8 20S ... 17.5 . 17.7 „�,_<�.�',�ms,v�'�.z.��;`�. Peanitted Phases ..�....�.. . � 8 � 4 Oueue Delay 0.0 0.0 0.0 0 0 0.0 OA Actualed Green,G(s) 2 8 15 7 4.2 17.1 10.3 10.3 7otal pelay 21.1 22.� 98.8 20.5 ' 17S '17.7 ;��3�:�p�,u f..»�„�;; �,,;,:' ;, Effective Green.9(s) 3.8' 17 7 _ 6.2 19.1 11.3 11.3 �ueue Length SOIh�fq 14 116 16 72 37 51 � Acluated g!C Ratio 0.08 0.38 0.11 0.41 024 0 24 Queue Length 95th(R) 41 #312 44 #348 85 106 -.�``�"�' ' � � �x��'�-:-::' � Clearance Time(s) 5.0 � BA 5.0 6.0 5 0 5.0 ' Internal Link Dist(ft) 179 197 340 364 I Vehicle EMension(s) 3 0 3.0 3.0 3.0 3 0 3.0 � Turn Bay Length(ft)�'��. � .. .. . � . . . � : �s,r"'�'�,y,X.��rvs �''�: I Lene Grp Cap(vph) . 14G ��688 . � 199 766 � � 358 � 439 . .. � Base Capacity(vph) 493 714 512 821 512 620 v/s Ratio Prot 0.03 027 c0.04 c0.29 Starvatiai Cap Reducfi 0� 0 0 0 0 � 0 ,�g'��"�-�;,,;� vls Ratio Penn 0.11 c0.12 �� Spillback Cap Reductn 0 0 0 0 0 0 v/c Ratio 0.38 OJO 0.�2 070 0.45 0 49 Storage Cap Redudn 0 0 0 0 D fl �. .a s -""-'; Uniform Delay,d1 20.1 12A 18.9 11.2 14.8 15.0 Reduced v/c Ratio 0.11 070 0.13� 0.65 0.34 0.36 � Progression Faclor 1.00- 1.OU � 1.00 1.00 1.00 1.00 ftlt8l9L*Ctie�1'Summ&ry. :<�-�- . ��.. . ... Incremental Delay;d2� i.� .�....32 ... 0.9 2B � � 0.9� � ..�:� 0.9 � ', Cycle Length:60 Delay(s) 21 8 15.3 49.8 13.9 157 15.9 Actueted Cycle Length:43.5 Level of Service C B B B B B Netural Cycle:65 � �� "�"� �� Approach Delay(s) 75 9 74.6 15 7 15.9 Control Type:Actuated-Unco6rdineted w?��'-�"�"��`�� Approach LOS B B B B s ��yx_��: �-� # 95th percentile volume exceeds capacity.queue may be longer_ ITIt�t96t:�ion Summaiy� � ^ ..."�""�',` „m.�„�;;�� ueue shown is mazimum after two cycles. � � '� ' � �� HCM Average Controt fk�lay 15 4 HCM lPvr.l of Serv�ce � 8�. .:.. . .. S lits and Phases 2 SR 900&148th Ave SE HCM Volume lo Capacity ratio U 54 Actuatetl Cycle Length(s) 402� Sum of losl time(s) �� 6.0 . � . �, �el �'e'2 '` 0d inlersection Capacity U6lization 66.3"/o ICU l..evel of Service C Anatysis Pe�od(min) 15 ,� c Cnbcal Lane Group � 'l e5 a6 -�� e8 M:107\07018 Delaney Park Subdivision\LOS\W.Prqed107018 W.Proj PM.sy7 M�\07\07018 Delaney Park SubdivisioMLOS\W.Pro�ecl\07018 W.Proj PM sy7 ' The Transpo Group Page 1 The Transpo Group Page 2 `.__ _--- - -- - --- - - _ __ , - -_- . __ -- _ _-- _ -- I CP H CONSULTANTS $ECTION 6.3 WETLAND IMPACT ANALYSIS (RAEDEKE ASSOCIATES, INC.; MAY 13, 2009� Site Planning � Civil Engineering Project Managemenf Land Develapmeni Consulting Delaney Park Subdivision Technical lnformation Report SECTION 7 - OTHER PERMITS Permits either obtained or to be obtained prior to approval of the Delaney Park Subdivision project include: • NPDES General Permit—Washington State Dept. of Ecology CPH Project No.0011-08-006 May 1 2, 2009 CP�H CONSULTANTS Page 19 Delaney Park Subdivision Technical Information Reporf SECTION 8 - CSWPPP ANALYSIS AND DESIGN ESC Plan Analysis and Design Site specific details and provisions for temporary erosion and sediment control (ESC) facilities are provided with the improvement plans that accompany this TIR. The proposed facilities have been selected and sized in accordance with the recommendations provided in the KCSWDM standards. Sections 8.1 of the TIR contain the necessary calculations and/or details related to the ESC facilities proposed for this project. In addition to the site-specific ESC measures, the following general Best Management Practices (BMPs) for sediment control shall also be implemented in accordance with the provisions of the KCSWDM: 1. Clearing Limifs A construction clearing limits fence, or silt fence, will be installed by the Contractor along the entire project corridor to prevent disturbance of project areas not designated for construdion. A double silt fence will be used when the clearing limits are next to a sensitive area tract. These fences will be installed in accordance with the KCSWDM Section D.4.1.1 prior to clearing and grading activities to help minimize impact to the surrounding area. 2. Cover Measures Temporary and permanent cover measures will be provided by the Contractor to protect disturbed areas. Mulching will be used in accordance with KCSWDM Section D.4.2.1 to provide ' temporpry protection from erosion and to enhance plant growth. Plastic covering may be used following KCSWDM Section D.4.2.3 in order to protect cut and fill slopes and stockpiles, �' and/or to encourage grass growth in newly seeded areas. Disturbed areas will be seeded and mulched to provide permanent cover measure and to reduce erosion within seven days, if not worked. 3. Perimeter Protection In order to reduce the transport of sediment off-site, the Contractor will install silt fences or double silt fences as indicated on the drawings prior to any up slope clearing, grading and trenching activities. 4. Traffic Area Stabilizafion Stabilized pads of quarry spalls will be installed by the Contractor at all egress points from the project site to reduce the amount of sediment transported onto paved roads or other off- site areas by motor vehicles.There will be a wheel wash station on site to aid in reducing the amount of sediment transport. Also, if any on-site materials are contaminated by fuels, grease, metals or other pollutants,they will be disposed of as described in the Spill Control Plan (SPC) and in accordance with all appropriate regulations. 5. Sediment Retention Sediment retention will be provided by rock check dams, silt fencing and a temporary sediment pond and/or other inlet and outlet protection as required at the locations and dimensions shown on the drawings, with maintenance in accordance with KCSWDM Section D.4.5. CPH Project No.001 1-08-006 May 12,2009 CP I H CONSULTAM�S Page 20 Deloney Park Subdivision Technical Information Report b. Surface Water Control Surface water control will include ditches, check dams,temporary sediment traps and outlet protection at the locations and dimensions shown on the drawings, and maintained according to KCSWDM Section D.4.6.The proposed on-site conveyance system will be used to collect surface water and it will be dispersed out of the catch basin prior to entering the water quality and detention vault. All proposed temporary ponds will be constructed and operational prior to site grading activities to provide temporpry sediment collection and surface water control based on site conditions at the time of construction. 7. Dust Control Water will be used by the Contractor according to KCSWDM Section D.4.7 to prevent wind transport of soil. Exposed soils will be sprayed until wet and re-sprayed as needed. At the Contractor's option, a tackifier may be used with approval from the Engineer. 8. Wet Season Requirements If soils are exposed during the period of October 1 to March 31,the Contractor will mulch and seed as much disturbed area as possible by the first week of October, in order to provide grass cover for the wet season.The Contractor will also conform to the following wet season special provisions: A. Apply cover measures to disturbed areas that are to remain unworked for more than two days. B. Protect stockpiles that are to remain unworked for more than 12 hours. No area is to be left uncovered�denuded longer than 12 hours during the winter months. C. Provide on-site stockpiles of cover materials sufficient to cover all disturbed areas. D. Seed all areas that are to be unworked during the wet season by the end of the first week of October. E. Apply mulch to all seeded areas for protection. F. Provide on-site storage of 50 linear feet of silt fence (and the necessary stakes) for every acre of disturbed area. Straw bales are to be stockpiled on-site for use in an emergency. G. Provide construction road and parking lot stabilization areas for all sites. H. Provide additional sediment retention as required by the King County Engineer. I. Provide additional surface water controls as required by the King County Engineer. J. Implement construction phasing and more conservative BMPs for construction activity near surface waters (to be evaluated). K. Review and maintain ESC measures on a weekfy basis and within 24-hours after any runoff-producing event. 9. Sensitive Area Restrictions Clearing and grading within the on-site wetland buffers shall be limited to that necessary to prepare this area for the proposed buffer mitigation or incidental and temporary disturbances related to the site development activities as shown in the accompanying construction and mitigation plans. CPH Project No. 001 1-08-006 May 1 2,2009 CP�H CONSULTAM-S Page 21 Delaney Park Su�vision Technical Informotion Report 10. Maintenance Requiremenis All ESC measures will be maintained and reviewed on a regular basis following the maintenance requirements listed for each BMP in Section D.5.4 of the KCSWDM. An ESC supervisor will be designpted by the Contractor and the name, address and phone number of the ESC supervisor will be given to the County prior to the start of construction. A sign will be posted at the primary entrance to the projed site identifying the ESC supervisor and his/her phone number. The ESC supervisor will inspect the site at least once a month during the dry season, weekly during the wet season, and within 24 hours of each runoff-producing storm.A standard ESC maintenance report will be used as a written record of all maintenance. The Contrpctor will be responsible for the phasing of erosion and sediment controls during construction so that they are coordinated with construction activities. The Contractor will also be responsible for maintenance of temporpry controls during construction, including removal of accumulated sediment, and for the removal of the controls and remaining accumulated sediment at the completion of construction. 1 1. Final Stabilization Prior to obtaining final construction approval, the site shall be stabilized,the structural ESC measures removed and drainage facilities cleaned. To obtain final construction approval, the following conditions must be met as required by Section D.5.5 - Final Stabilization: • All disturbed areas of the site should be vegetated or otherwise permanently stabilized in accordance with project BMPs. At a minimum, disturbed areas should be seeded and mulched to provide a high likelihood that sufficient cover will develop shortly after final approval. The plans include erosion control notes and specifications for hydro-seeding and mulching disturbed areas. • Structural measures such as silt fences, pipe slope drains, storm drain inlet protection and sediment traps and ponds shall be removed once the proposed improvements are complete and vegetated areas are stabilized. • All permanent surface water facilities shall be cleaned completely and restored to working order prior to removal of ESC facilities. CPH Project No.001 1-08-006 May 12,2009 CP I H CONSULTA�lTS Page 22 CP H CONSULTANTS I SECTION 8. 1 i ESC FACILITIES DESIGN CALCULATIONS Site Planning (ivil Engineering Project Munngement �and Development Consulting Delaney Park Subdivision ESC Facilities Calculations SEDIMENT POND CAICULATIONS Surface Area: SA = FS (Q�o�Vs) FS = Factor of Safety = 2 , Q�o = 1.75 cfs VS = 0.00096 ft/s SA = 3646 sqft *design must be 3:1 ratio of L:W L = 35 W = 105 New SA = 3675 Spillway: t _ Q�oo = C�2g�z 3 LH 2 + 18�TANB�H 2 L _ Q�o0 3 —2.4H 3.21H'- H = 1 Qioo = 4.1 1 L = -1.12 FT MINIMUM OF 6 FT WIDE Spillway Length = 6.00 FT Riser: Ao = 4.81�10-6�As� AS= 3675 h = 2.5 Ao = 0.028 D =13.54 Ao D = 2.3 INCHES CPH Project No. 0011-08-006 I�' Delaney Park Subdi��ision Sediment Pond Flo«�s Flow Frequency Analysis Time Series File:sed trap.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 1.24 6 8/27/O1 18:00 4.11 1 100.00 0.990 0.909 8 1/05/02 15:00 2.80 2 25. 00 0.960 2.80 2 12/08/02 17:15 1.75 3 10. 00 0.900 0 .997 7 8/23/04 14:30 1.71 4 5. 00 0.800 1.71 4 11/17/04 5:00 1.52 5 3. 00 0.667 1.52 5 10/27/05 10:45 1.24 6 2. 00 0.500 1.75 3 10/25/06 22:45 0.997 7 1.30 0.231 4.11 1 1/09/08 6:30 0.909 8 1. 10 0.091 Computed Peaks 3 .67 50. 00 0.980 CPH Project No. 0011-08-006 Delaney Park Subdivision Technical fnformation Report SECTION 9 - BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT Bond Quantity Worksheet Bond Quantity Worksheets are not provided at this time. Cost estimates for bonding have already been provided to the City. This completed form will be prepared and submitted with the final TIR as Sedion 9.1 if required. Flow Control and Water Quality Facility Summary Sheet and Sketch In accordance with section 2.3.1.1 of the KCSWDM, Flow Control and Water Quality Facility Summary Sheets for the project site is provided in Section 9.2 of this report. Declaration of Covenant for Privately Maintained Flow Control and WQ Facilifies None of the proposed flow control or water quality facilities for this project are proposed to be privately maintained.As such, a Declaration of Covenant is not required. Declaration of Covenant for Publicly Maintained Flow Control and WQ Facilities The storm drainage facility proposed with this project is proposed to be publicly maintained. As such, a Declaration of Covenant for publicly maintained storm drainage facility will be prepared and included with the final TIR as section 9.1 prior to final engineering plan approval. Declaration of Covenant for Privately Maintained Flow Control BMPs No new privately maintained flow control BMP facilities are proposed with this project. As such, a Declaration of Covenant is not required. CPH Project No.001 1-08-006 May 1 2, 2009 I CP I H CONSULTANTS Page 23 I CP H CONSULTANTS $ECTION 9. 1 BOND QUANTITY WORKSHEET AND DECLARATION OF COVENANT Site Planning Ciril Engineering Project Management Land Derelopment Consulting CP H � CONSULTANTS II $ECTION 9.2 '� FACILITY SUMMARY SHEETS Site Planning Civil Engineering ProjecT Management Land Development(onsulting KING COtiNTY, �VASHINGTON, SL?RFACE VVATER DESIGN MANUAL STORMWATER FACILITY SUMMARY SHEET DDES Permit Number r (provide one Stormwater Facility Summary Sheet per Nattsral Discharge Loculion) Overview: Project Name 0.►� � �c��iftsio�-. Date �—�Z —�7 Downstream Drainage Basins Major Basin Name L.a�. (n/as��n�j7� Iinmediate Basin Name C Flow Control: Flow Control Facility Name/Number � Facility 1 1 , L Location ��rcv+av a�,..& '!v rr.tN�-i w ra� v a►, ar�c �s�i If none, Flow control provided in regionallshared facility (give location) No flow control required Exemption number General Facility� Information: Type/Number of detention facilities: Type/Number of infiltration facilities: ponds ponds 1 vaults tanks tanks trenches Control Structure Location Sn S i�t, v�.u,�1 Type o�Control Structure Cmp r i S�,Y- Nurnber of Orifices,�Restrictions �� Size of Orifice/Restricrion: No. 1 �•� No. 2 /,S„ No. 3 .2 S�� No. 4 ° �c�'. o Flow Control Performance Standard CohSe.rva.T��rn �� oW 2009 Surface VVater Design Nianu.11 1`9-2(H� 1 KI:�'G COt-NTY, WASHINGTON, SURFACE WATER DESIGN MANUAL Live Storage Volume �Z, 02� Depth �•0 Volume Factor of Safety Number of Acres Served 7.b7 �cr.-S Number of Lots 2 rj Dam Safety Regulations(VVashington State Department of Ecolog�) Resen�oir Volume abo�°e natural grade ,5'� 02� Depth of Reservoir abo�7e natural grade�F T Facility Summary Sheet Sketch All deteution, infiltration and water quality facilities must include a detailed sketch. (11"x 17" reduced size plan sheets may be used) 2009 Surface«'ater Desien Manual 1i9;2009 y 2 KING COLiN"IY, �VASHINGTOI�, SL"RFACE Vl'ATER DESIGN I�•fANUpL Water Quality: Type/Number of water quality facilities/B'_VIPs: biofiltration swale sand filter(basic or large) I {regulariwed or continuous inflow) sand filter, linear(basic or large) ��, combined detention/wetpond sand filter vault(basic or �i large) �I (wetpond portion basic or large) sand bed depth (inches) �! _�combined detentioii'weh�ault storm«�ater wetland filter strip storm filter flow dispersion wetpond (basic or large) farm management plan wetvault landscape management plan Is facility Lined? oil/water separator If so, what marker is used above (baffle or coalescing plate) Liner? � catch basin inserts: Manufacturer pre-settling pond pre-settling structure: I�lanufacturer l�igh flow bypass structure(e.g., flow-splitter catch basin) source cantrols Design Liformation Water Quality design flow Q,p7 g �-�S Water Quality treated volume (sandfilter) N l� Water Quality storage ti-olume {wetpool) (�,��f' Z Facility Summary Sheet Sketch 2009 Surface��'ater Design:�tanual 1�'�� 3 KING COL'NTl', R'ASHINGTON, SURFACE WATER DESIGN MANliAL All detention, infiltration and water quality facilities must include a detailed sketch. (11"xl7" reduced size plan sheets may be used) 2009 Surface�Vater Desien 14anual 1i9.%2009 4 , , N .1,/4, SE 1,/4, SEC. 10, lWP 23 N, R5E W.M. i -,�j �. � � _ � C 10+9 1 �� ' .�� 1 I � � � I I REypVAB�E$LAg, p2A TE AND _ . . . ` �i � -,� . ° � �� l I I [ '�I . ACC£SS HATC)1 AND FRAYE. , ` � . 1� � �, +o� \� SiANDARO MANHIXE RING I I '.I � V14JTY VAULi 5496'H20 OR . �y � o _Z/'� � � � � I; � �� AND SQW CO�£R(LOCIONC) APPR06f'D EWAI. 9ff AND _ - • �r �.. �-.J ' � � I � _ (n�,+��, . ..I� -\ . . � �� FMUSFIED CRADE(11P.) NARKED DRAIN. SURFAC£ LOCAM14 PQt PUN.SEE NOTE 5 . . : . < j �. � - � � - . 1 ! � ACC�SS SEE NOTE 5 1 \ \�\ \ \\ � I �y" s�+sn�,v� rn�'Cr ' � � ' ,'c�'\ � \_ - � L'� -_ . , . i � iRarav,leY.e � � _ . . . . .• � I: T .IOf � � \j / � ' I �� YAX WS-r6�.5 � . �:. . � '�`�- . . , r � . \ �� , . �� PRECAST G1R � �"�� . � ,:�; � � \ . •�� CAST-IN-PLAC£ , '" r .• � , .�I � ! �-,\ � 'f : J �, • n CONC. 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VAULT SHALL BE PRECAS7 OR CAST-IN-PUCE CpJCRET�MANUFACNRED FApU1Y ' �:` �� . `,5.0� � �� `� �, I �� I I I '�� nON VOLUYf AS'BU71'i DETETInON DESCNED TO SUPPORT A MWIYUM HS-70 TRAFFIC LOAD. VAULT YANUFACNRfR OR ____=___=__=====STORMWATERTR,4CT--=--=-------- --- - I__� '�,4 , �. � � i _ _ , 'I � �nnar�a � aRo r � w� c� • . oE uu� c� �om r,� uu� . x, - - ------------ -------- - ., �o maw�i smuct�iu��u��w n�As�i�aFAw�wctar �rxac � 15 6'9Gy. � . . i ' � i I �� VAULT CAPApTY AND COYPUANCE M7H Nl PR0..ECi REOUIREYEN75 ING.UOYNG � 1.D.S . . � I � �..` . �: I I 56.500 57.OZf ' PERFORATED WALL/FOUNDA710N DRAMI ELEVATIQNS SpL BEARINC CAPAGIY, AND I CROUNOWATER CON0ITIQNS. RECORO COPIfS QF THESE STRUCTURAL CALCUlA71Q45 ANO � � �' . � I � 1 I � ',I �/ SNCP DRAMMICS SHALL BE PROVIDED TO THE BlAIDWG OEPARTAIEMTS PR10R TO i �I I I'�I� I �� \ C YWIMUY REWIRED w��x ouwrr AS-BUILT WATER ca+smucncw. ; `. .�i , ,, �,; , � ------- � 'c� I h.� � � ` � � w�n�r ou�wir vrxuuE ou�un KxuuE fr,� „ f -- ,,- _ _ . . o� .. ,, -------- --s---- � ' I ��, � WLUYE(CF) PRONOm(f� 2 ALL VAULiS SHALL NEET IFIE 51RUCNRAL REq11RE11ENT5 FOR OVERBURDEN SUPPQ4T � ' � I . �.,s..��`�� :i y ;�S7Ml(>AR6 MANHOLE RMC AAIQ� - �.I . � � � ` � _ UNDER A YIMYUY HS-20 IRAfF1C LOADM& - .. � . �� -._ �� ' SOI.ID�.CbYFR(LOpCNVG) tYP. i ----- - L_ � 1Efl.EOR EOfNVALENiLL BE CpPROSIpV RE95TANi STEQ PAR75 SHALL BE STAWLESS __ . .� T � � � "....;... .:_ . : : _ __- ! 5 i �. 14.550 1$B40 t - - � C _� � v� +P- �___.._.. - - � v V y �„B',-, 4-FT HI(71&ApC-NNri COAIED � 4. PROhOE WATER S7GW AT ALL CAST-MI-PLACf CQNSTRUC110M/J(XNTS PRECASi VAULIS _ � FENL�AT WALL,�MSDOT hPE�, W,�!�Typ.� � - SHALL HAYE AN APPROY£D WATER TICHT,RUBBER CASICET SYSIEM. . . a� v .. � -� NQ♦-. � SfE Sf1EE'T C220 . � . . _ � 5. ALl VAI/L1S SHAII BE PRONOED MTH A YMIYUY OF ONE POINi OF SURFACE ACC£SS TO . : - '� `'. ." ••� .• .' ... � � � �. � ' � � EACH lN1ERIOR CHAMBER ARfA�AND EACH ACC£SS SNALL B£EWIPPED NITH � . . . .� .� . . .. . � > . , I � UDDER/F2UNCS. ACCESS UD$SHNl BE ALICNFD A T 1HE INL£T AND W R£T PIPf , . . . . . . LOCATIONS(MI/JIMUY). AN ADDI110NAL PpNT Q�SURFACE ACCESS, EIX/A!IN DINENSION TO /HOSE PRONDED AT THE MMEi AND OUTIEi PIPES, SHALL B£PRONDED AT THf YIDOLE EDC£Q�THE L£NGTH OF 7HE VAIN.T FLR ALL VAULTS MITH A TOTAL INTERIOR LENGTH GREAIER THAN QQ EOUAL iD 100 FFEi AND LES$ THAN LW EWAL TU 120 FFEi P�N 6. RIM ELEVATlONS SHALL 8E AWUSTED AS REOUREO TO ACCOMAIOOATE ACNAL ACCE55 LOCATIONS AND FMMSH£0 CRADE CQMa1T10NS SCALE 1'�2p' �py�(AS y10�y 7. ALL UNSUITABLE SqLS SHAL!BE RQIOYED FRCW FOOIPRXIT OF VAULi AND TU A �aµ) pSTANL�BEYpND 1HE VAULi EOUAL TO 1HE DEPIH Oi OYER EXGVAIED YATERIAL M : RMI EL.=�69t ACCQ4DANCE NITH 1HE PRQiECi PLANS AND SVEpFlCATICYJS.AND AS OIREClEO BY THE I ENGYJEfR. ALL UNSUIiABLE YATERIAL SHALL BE REPLACED NiTH Sl11TABL£CLINPACT �•�� SURfACE ACCESS SiRUCNRAL F7LL YAiER1AL RECiANC.tMR NOTp1 ��n.p� SiANDARD FRANE AND ROUND, g, pRp,�CT ORAWINGS REFERfNCE P007 KCRS ELBOW RESTRICTl.1R SOUD W(LOp(WC) i0C=469.5 �• W/f.?5'qAY. QP1FlL� I.Ox t fl. = 16dOf - 4. SURFACE ACCES$YANHOLE FRANES AND GRATES SHALL BE PRONDEO NITH A MAJOMUY fXPOSED CONLRElE OF 1B"Q�PoSER/LEVEL/NG SFCTIONS OTViEHWSE THE FRANE ANO GRATE SHAf1 BE VAULi FAC£5 • • • . . IU1P=I65.0 PLACID ON A TYPE 2-18'W OR MSER CONE EIBOW RESTRICTOR�/1.50" - MAX M5��.5 10. ANY DISCREPANGES BE711f.'E/�I iHE APPROYfD pNL AND STRUCNRAL PUNS REGAROMC DIAM. OR1f1f.�PER KCRS !E 4B0 =461.H EL=�63.8 ACCESS RISfR F�7GN15 AND/OR UDOQ2 LOCA7ILWS SHALL BE POVERNED BY iHE � DMG. N0.2-025 IE 4B0 =461.3 APPROIfD qNL PLANS �, 18�OIAY. PoSER PEN KCRS ��i' "� TOE=PER PUN DNC. N0. 2-025 a �� 20'MAX ' °' �... I��SHEAR GA/E AND � ov� 12'r12'KNOCXWi �,� o EX�ST. CRAOE �' ct . LIFiING IPOD ; , •i i ` _ ----WS Ei£V=455.5 ,. - - �`'� � �' -- ---------------- --------------o -- - ------------------------------------------------------------- 9 S _ ,a-�� x 20' ��-------- ---M/LElPIRE------ ��`!3,. �� PIPE W TFALL �� '� E-"3 YIDPQ�Ni � �.�'�. � �� 4 ! d' PROTECTION PER DEiALL ;. �`+ 3� FL- N9.5 � ,o � � g� � ON SNEET C2 f 03 ? :. ElEV.�450 5 � , �J �OSx 5 0.5x ;'s BOT.=149_2 � '. . • < • SOL�DPUIE � :-. �.,i xu.�� .,..., :J: ? : c : ,:a -� ,... .._� - � ':, f.. v.��,�..Z �-cs� '. , ,l �...-. , a ?i� ti,l .Y_:% �wr�'.'� �'�jJ l5T84�eq , . r/1.0"OIAY. A4lFlC£ 5� - ,3'` Y'�.,._�-3f�'3`-4>-.�y�.s.,�:�� x:c r.:.�.,.�,..,.-s--�+ cJ-��S.'�,k�.'1: _Y3�t-i;�v�:- F3a�-..,......x ....,.�..xu.�..� �;:,g_c.` .s.z':::x r ,i-��;:�� .�i'.>'.: i�t,�-; i� r �� `�� arou��'�� 0 N S U L TA N T$ �� ,�`��- IJ2A � "� t3 `�J . .,ti�.. o�..ya+r�y SEDAIENi PRECASi 0/7 VAULT LENGiH ... �W4�+'W��+1 SUI TABLE UNqST1/RBED NA TIIf YOU D16 ��m srt�c�oEpn� c�sr-w�-auce cw��s�orte rn,a�,...,sr�m CONC. VAULi OR COYPACi$iRUCNRAL fll.l. 1-000�424-5555 v�vcl�l�a■ q SECTION NATERIAL SEE NOIE 7 ��y� ' Nor ro scuF � .:rr cF =_�.r��: =F��ir s�ee��^'_ �es a-a;'oa �es s�.+ve e�.aNEs. =-s " „ . ., _,,; J,� DELANEY PARK SUBDNISION �s!'z'oe sc.��E �'s i �<u c 9.SC��+OE]ER, PE � v ROADWAY GRADING.DFiAINAGE AND SANITARY SEWER IMPROVEMENTS �P�R,,,�5 �E N-C r�� "�- DANM /''� (� �w�.E 9.SCrRCE7ER PE �ar�irgjBuildir��PubliC Wor.cs oe�c. STORMWATERVAULTDETAILS 1�2.101. .xnP�smovs�¢.:nxs_icuan�a.,....a NC. �=`IISI�N BY ^aT- APFP. sn�.�c� ec�?a.=c HI' t5 aZa Defaney Park Subdivision 7echnical Information Report SECTION 10 - OPERATIONS AND MAINTENANCE MANUAL All of the proposed storm drainage collection and conveyance systems, and proposed detention/water quality vault facilities will be publicly maintained. Each of these facilities has been designed in general accordance with current City of Renton standards and�or KCSWDM criteria. As such, an operations and maintenance manual related to these facilities is not required. CPH Project No.001 1-08-006 May 12, 2009 CP I H CONSULTANTS Page 24 � �EDEKE ASSOCIATES, INC. i 1 NE b3rd Street � � ��ttle, Washington 98 I 1 S — ,_ �6) 5Z5-81 ZZ F�,x j ZObi 5Zb-Z880 , TECH�iICAL MENIORA�'�iDUM I May 20, 2009 I To: Mr. Greg Strong, Rick Burnstead Construction , cc: Mr. Jamie Schroeder, CPH Consultants , From: Rick Lundquist,Raedeke Associates, Inc. RE: Delaney Park–Response to City of Renton Comments on Storm Drainage and Wetland Hydrology (R.A.I.No. 2006-038-005) At the request of Mr. Jamie Schroeder, of CPH Consultants, the purpose of this memorandum is to provide responses to comments from City of Renton staff(dated March 3 l, 2009) on the proposed plat of Delaney Park. These comments were received via email from CPH Consultants on April 22, 2009. In particular,this will address the comment relating to wetlands on the proposed drainage plans. The response will be indexed to the numbered comments from City staff. Storm Drainage Report Comments, S"' bullet: The Wetland and Wildlife Report references (sic) in the drainage report has very little discussion regarding the hydrology of the wetland. The report basically states that the project � proposes to disperse runof�j`�into the wetland butprovides no recommendation of its own. What specific hydrologic input is recommended by the project's wetland biologist? The report should provide an analysis based on the requirements of the Wetland hydrology Protection Guidelines (Reference 5) in the 2005 KCSWDM. Response: The review and analysis of wetland hydrology in the context of the proposed development will focus on Wetlands C and D. Wetland A/B lies to the west of Wetlands C and D, and its contributing basin would not be affected by the proposed plat. No stormwater discharge from the proposed development would be routed to Wetland A/B. As discussed in our wetland and wildlife assessment report(Raedeke Associates, Inc. 2007b),both Wetlands C and D extend off-site, Wetland C to the north and Wetland D to the south. The majority of both wetlands lie off the Delaney Park site. Wetland C is classified as a slope wetland with only a small depressional area (Raedeke Associates, Inc. 2007a, 2007b, 2008); the wetland extends downslope to the north within a shallow , topographic swale toward another wetland mapped on the property to the north,but ends without a surface connection to it or to Honey Creek(Raedeke Associates, Inc. 2008, ). Mr. Greg Strong May 20, 2009 Page 2 Wetland D lies within a closed depression with no surface inlet or outlet. The off-site portion and its buffer are surrounded by the Shamrock development. During our field investigations, the wetland was saturated within the upper soil profile,but exhibited little or no evidence of surface ponding(Raedeke Associates, Inc. 2007b). Most of the off-site portion consists of a forested vegetation community dominated by black cottonwood (Populus balsamifera),with an understory of salmonberry(Rubus spectabilis), rose spirea (Spirea douglasii), and Himalayan blackberry(Rubus armeniacus). Based on previous field investigations,neither Wetland C nor D appears to flood or pond water regularly. Wetland C lies generally on a gentle slope and has little capacity to pond water other than in small depressions or behind small hummocks. We observed only small puddles within the wetland during our spring field investigation. Although Wetland D is located within a closed depression,we observed only saturation within the soil profile and found no indicators of seasonal ponding or inundation during our field investigations(Raedeke Associates, Inc. 2007b). Thus, neither wetland likely provides habitat for breeding amphibians or aquatic invertebrates. Research results from the Puget Sound Wetlands and Stormwater Management Research Program have found that urbanization in the watersheds of wetlands is correlated with increases in water level fluctuations (WLF; both mean and maximum, and durations of "excursions" above base levels; Azous and Horner 2000). Higher average monthly water level fluctuations appear to be correlated to some degree with lower plant species richness and diversity(Cooke and Azous 1993) and lower amphibian species richness (Richter and Azous 1995),particularly during the spring season. The research results have suggested that the WLF "threshold" above which such changes occur is about 20 centimeters (about 0.66 feet, or 8 inches; Azous and Horner 2000). This research also suggested that increasing the duration and frequency of"excursions"of at least 15 cm (0.5 feet)above the pre-development water levels is correlated with reduced plant species richness or diversity(Azous et al. 2000). Consequently, the wefland protection guidelines in the King County(2005) Surface Water Design Manual (KCSWDM, Reference 5,Guide Sheet 2B) focus on these types of measures in evaluating project impacts to wetlands. However, for this project involving relatively small wetlands with limited seasonal hydrology,no detailed hydrologic modeling of each wetland could be constructed using a continuous computer model, as no baseline monitoring data are available. Because Wetlands C and D lack evidence of regular ponding or inundation, the measures of primary focus in such an analysis, monthly WLF or"stage excursions" above baseline levels, would be difficult to model and interpret meaningfully. The guide sheet includes a list of conditions under which WLF could be estimated based on general relationships found in existing watershed between WLF and the level of development (represented by total impervious area) in the contributing basin from i Mr. Greg Strong May 20, 2009 Page 3 wetland research conducted by King County (Azous and Horner 2000). The on-site basins of both wetlands contain a small area of impervious (gravel drive, existing buildings), along with horse pasture and relatively little native forest. The off-site basin for Wetland D (Shamrock Heights, south of the Delaney Park site) consists largely of urban residential development(aside from the wetland buffer),whereas most of the off- site basin of Wetland C (the Rosemonte plat, north of the Delaney Park site)has not been developed to this date. Thus, in theory based on the general relationships found in the research, monthly WLF in Wetland G likely do not exceed 20 cm (about 8 inches), whereas in Wetland D,WLF is more likely to exceed that threshold. However, as noted previously, we found no evidence of regular seasonal inundation or ponding in Wetland D, so WLF inay not be a significant factor in the current functioning of either wetland. The guide sheet section with hydroperiod thresholds associated with wetlands of high species diversity(plant species or habitat for breeding amphibians)would not be readily applied to Wetlands C and D in their cunent condition,because they do not appear to undergo regular ponding and no detailed modeling of WLF is available. In addition, Wetlands C and D are not priority peat wetlands (those with organic soils), so the hydroperiod thresholds associated with those types of wetlands do not apply. Development of the site under the proposed plat of Delaney Park would increase the amount of impervious surfaces on the site,which would result in increased stormwater runof£ If left uncontrolled, this runoff would result in a seasonsal increase in water to Wetlands C and D, and could result in a substantial increase in water level fluctuations. The proposed stormwater drainage system has been designed by CPH Consultants to collect and detain the majority of the runoff and release it at controlled rates to the wetland buffers to provide hydrologic support to the wetlands. In order to do this, CPH Consultants delimited the contributing basins (both on-site and off-site; see attached exhibit) for the wetlands and modeled stormwater runoff using the King County Runoff Time Series (KCRTS; King County 2009) computer model to size the facilities and compare existing conditions and post-development conditions under the proposed site plan. Under the 2005 KCSWDM, stormwater runoff from detention facilities must be controlled to the rate associated with native forest, even though the project site is ' currently a mixture of rural housing and associated horse pastures. In this way, storniwater runoff from the site would be controlled and released in such a way as to protect downstream resources,including the on-site wetlands. Peak flow rates for return periods from 1.1-year to 100-year storm events were calculated for pre-and post-development conditions. In addition, flow volumes for typical 2-year storm event were calculated for pre-and post-development conditions. The initial calculations showed a general reduction of peak flow rates for Wetland C and reduced peak flow rates for more frequent storm events for Wetland D, compared with existing conditions. However,the initial volume calculations indicated a substantial decrease in volumes for Wetland C and a substantial increase in volumes to Wetland D. Mr. Greg Strong ' May 20, 2009 Page 4 ' Upon review of the initial calculations, and in consultation with CPH Consultants, we recommended refining the drainage plan to provide a 50:50 split of flows from the stormwater detention vault between Wetlands C and D,with roof drains from selected , lots to provide additional flows to Wetland C (the larger of the two wetlands). Under the revised plan,peak flow rates to Wetland C from the project site would be reduced by 25% to 37% for the more frequent storm events (up to the 5-year event), with smaller reductions for the less frequent events and nearly matching flow rates for the 50- and ' 100-year events. Including the off-site basin to the north,peak flow rates to the entire wetland would be reduced by less 15% for the more frequent events, with peak flow rates essentially matched for the 50- and 100-year events. Post-development flow volumes for a two-year storm event are expected to increase by 43%within the on-site basin and 14% for the entire wetland. For Wetland D,post-development peak flow rates within the on-site basin are expected to decrease by 8%to over 70%, with the largest decreases for more frequent storm events, compared with existing conditions. Including on- and off-site buffer tracts, as well as th off-site basin to the south,the expected changes are generally smaller. The flow volumes for a two-year event are expected to increase by approximately 60%within the on-site basin (and buffer tracts) and by 39%overall, including the off-site basin to the south. I � Overall, although stormwater flow volumes are expected to increase to both Wetlands C and D after development,the rate of discharge from the detention vault would be lower than under current conditions. 'This results from the requirement of controlling developed flow rates to the level associated with the native forest condition. Although the wetlands will likely receive more volume of runoff, the controlled flow rate should help prevent increases in"flashiness,"or water level fluctuations. Essentially, the additional volume I will be metered out at a slower rate over a longer period, for a given storm event, than under current conditions. The stormwater detained within the vault should help prevent excess flooding within the wetland or to areas farther downstream. j We do not expect any substantial adverse impact within Wetland C from the proposed I�� drainage system, given that the majority of the wetland gently slopes to the north and '� because it consists primarily of well-developed forest vegetation (particularly the off-site portions. T'he on-site portions currently in pasture vegetation are expected to develop I into scrub-shrub and forested communities over time. Wetland D, which lies within a closed depression, could experience some increase in seasonal water depths after development. This has the potential to adversely affect the forest vegetation. However, the dominant cottonwoods are well-adapted to seasonally wet conditions, and cottonwoods can persist with some inundation. In addition,potential water depths are limited by the low topographic divide between Wetland C and D. Based on our assessment, the stormwater drainage system will thus provide hydrologic input to both Wetlands C and D, while preventing increases in WLF within the wetlands and flooding of areas farther downstream. This should maintain the overall functioning Mr. Greg Strong May 20, 2009 Page 5 of these wetlands over time. With cessation of livestock use on the site, including these wetlands, the disturbed, compacted pasture areas should develop into scrub-shrub and forest cover over time, enhancing their habitat functions. LI111TATIONS We have prepared this report for the exclusive use of Rick Burnstead Construction and its consultants. No other person or agency may rely upon the information, analysis, or conclusions contained herein without permission from Rick Burnstead Construction. The determination of ecological system classifications, functions, values, and boundaries is an inexact science, and different individuals and agencies may reach different conclusions. With regard to wetlands, the final determination of their boundaries for regulatory purposes is the responsibility of the various agencies that regulate development activities in wetlands. We cannot guarantee the outcome of such agency determination. Therefore, the conclusions of this report should be reviewed by the ' appropriate regulatory agencies prior to any detailed site planning or construction activities. We warrant that the work performed conforms to standards generally accepted in our field, and has been prepared substantially in accordance with then-current technical guidelines and criteria. The conclusions of this report represent the results of our analysis of the information provided by the project proponent and their consultants, together with information gathered in the course of the study. No other warranty, expressed or implied, is made. Thank you for the opportunity to provide this information. If you have any questions or comments, or wish to discuss this issue further, please contact me at (206) 525-8122 or at n�hmdquistfa�raedeke.com. Mr. Greg Strong May 20, 2009 Page 6 ' LITERATURE CITED Azous,A.L., and R.R. Horner, eds. 2000. Wetlands and urbanization: Implications for the future. CRC Press. 3b0 pp. Cooke, S.S., and A. Azous. 1993. Effects of urban stormwater runoff and urbanization on palustrine wetland vegetation. Puget Sound Wetlands and Stormwater Management Research Program: Center for Urban Water Resources Management, University of Washington Seattle. March 1993. 48 pp- King County. 2005. King County, Washington Surface Water Design Manual. January 24, 2005. King County Department of Natural Resources, Seattle, Washington. King County. 2009. King County Runoff Time Series (KCRTS)program documentation. Stormwater Services, King County Water and Land Resources Division. http:!�«��-.kingcounty.�ovien��ironment/waterandland!stormwateridocumentsi sur face-water-design-manual;`hvdrolo�ic-hydraulic-model-sofrivare/kcrts-program_ documents.aspx. Accessed May 2009. Raedeke Associates, Inc. 2007a. Delaney Park—Response to King County Comment Letter, Application No. L07P0010. December 13, 2007 technical memorandum to Mr. Greg Strong, Rick Burnstead Construction Company and Mr. Jamie Schroeder, CPH Consultants. 4 pp. plus attachments. Raedeke Associates, Inc. 2007b. Wetland and Wildlife Assessment for Delaney Park, King County, Washington. July 19, 2007 report to Rick Burnstead Construction Co., Bellevue, Washington. Raedeke Associates, Inc. 2008. Delaney Park—Response to King County Comment Letter, Application No. L07P0010. January 31, 2008 technical memorandum to Mr. Greg Strong, Rick Burnstead Construction Company and Mr. Jamie Schroeder, CPH Consultants. 4 pp. plus attachments. Richter, K.O., and A.L. Azous. 1995. Amphibian occurrence and wetland characteristics in lower Puget Sound Basin. Wetlands 15(3): 305-312. �emm� Nt 1.4 SL 1.�-1 SfC 10 Tlh'F`23,\. IiS[ W.M. .ori,oarw. . . , ; @ xn iuw,� am w.� . '' � � I i , m mr�mw . � '�""�"'.'�.""'."�"""""""'.""""�"' - � �Mxr.� I��H�.T�� '. � ... ' , .. ... .... .. ....... . .... � I . r ' y l � . . .. ... � ... � . � I i. �, . ,,... . , ... . ('.) � I.'.'./ �` I ; �. /�/ 1 /. . .� _ , . . . �'� 1 1.'.'t � . .�.� .... . ...... .........._..I I 1 � . I ....... .... ... ........................ � ; i �I... ��.�"�� ' �� "�``f..J:...•.•�:� Ii _ .. . ....__. ... .. _...... i � J li,.I, _:.., �.( ..' � �' � i.... ,. i l/ �.� . .._...... . . � .................. . . I.. . ' � i i.'I 1 f. �•�.".'.'/ ....��1 It I ....... ... ......... I_ .......... ... � I �� r� ��.'I � � . :,;.1 . ' � ... I,.. � I '.,�� E � . . . . . . . . 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