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Home My WebLink About03476 - Technical Information Report TECHNICAL INFORMATION REPORT Petro Vista Plat Southeast Corner of 118th Avenue S.E. and S.E. Petrovitsky Road King County, Washington King County Project No. L02P0012 Prepared for: Bennett Sherman, LLC 2100 — 124th Avenue N.E., Suite 100 Bellevue, WA 98005 , , r November 3, 2004 ��. %�� Our Job No. 1101 ��Zr`' ' � 5�� RECEIVED �.-��, ti Y. c ,�Q'�of"'A yi Nnv � 4 LU04 y� � KING COUNTY LAND USE SERVICES 75 0 �,�' ` G�STER� \a�. ` _/L SSIONALENG ' �`VT GHAV PIRES: 6 /10 / m '►I�SZ y CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES sG ��,','� y? 1SZ1 rJ 7ZND AVENUE SOUTH KENT,WA 98032 (425) 251-6222 (425) 251-8782 FAX �l �� BRANCH OFFICES ♦ OLYMPIA, WA � TEMECULA, CA ♦ WALNUT CREEK, CA "�EN�`"� www.barghausen.com � ; TABLE OF CONTENTS 1.0 PROJECT OVERVIEW 11 Technical Information Report(TIR)Worksheet 1.2 Vicinity Map 13 Soils Map 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Responses to Hearing Examiner's Conditions 22 Hearing Examiner's Report and Decision dated April 30,2004 2.3 SEPA Determination of Non-Significance dated March 15, 2004 3.0 OFF-SITE ANALYSIS 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN 5.1 25-Year and 100-Year Conveyance Calculations and 1�Iap 6.0 SPECIAL REPORTS AND STUDIES 6.1 Geotechnical Engineering Report prepared by E3RA, Inc., dated August 11,2004 6.2 Wetland Analysis Report prepared by Wiltermood Associates, Inc., dated September 20, 1999 63 Yhase 1 Environmental Site Assessment prepared by E3RA, Inc., dated August 16, 2004 7.0 OTHER PERMITS 7.1 Postmaster/Mailbox Location Approval 7.2 Water and Se��er Availabilitv Certificates 8.0 ESC ANALYSIS AND DESIGN 9.0 BOND QUANTITIES, FACILITY SUti7N1ARlES � s 10.0 OPERATIONS AND MAINTENANCE MANUAL > � z� � � _� lj�.l � V o U� G'3= W � YZ I L� z ¢ 1 l�l L004.doc[DED/dmJ 1.0 PROJECT OVERVIEW The proposed plat of Petro Vista Plat is approximately 3.8 acres in size and is located �vithin a portion of the Section 35, Township 23 North, Range 5 East, Willamette Meridian, within King County, Washington. More specifically, the site is located at the southeast corner of the intersection of I 18th Avenue S.E. and S.E. Petrovitsky Road. Please refer to the Vicinity Map included within Section 1.2 of this report for a more detailed site location. There are two existing drainage basins on this site. The majority of the on-site area drains to a wetland and depression referred to as Tract B. Tract B is located along the north propem� line and �vill contain this wetland and buffer area. Approximately three-quarters of the site slopes towards this depression with slopes ranging from 2 to approximately 40 percent. The balance of the site slopes in an easterly direction toward an off-site wetland along the east boundary line. There is an existing house and associated driveways and outbuildings that for the most part are located within the east drainage basin. The existing on-site vegetation consists of a mixture of trees, shrubs, and lawn areas in the developed portions of the site. The proposal for this development is to construct 18 single-family lots ��ith associated storm drainage facilities and road improvements. The proposed detention and water quality facility will be located within Tract A, which is located along the north portion of the development,just east of Tract B. The existing house and all of the outbuildings will be removed or demolished with the development of this project. A new public roadway will be constcucted down the center of the development in an east-west direction. Access will be gain from 118th Avenue S.E. for Lot l8. Access to the remainder of the lots ��vill be provided by the ne��v S.E. 176th Court. Frontage improvements are also being proposed along the east side of l 18th Avenue S.E. ]101 LL10-t doc�D[n'dm] 1.1 Technical Information Report {TIR) Worksheet King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESGRIPTION Project Owner Bennett Shertnan, LLC Project Name Address 2100 l24`h Ave. S.E., Suite 100 Petro Vista Plat Phone (425)709-6508 Location Project Engineer Hal P. Grubb, P.E. Township 23 N Company Barghausen Consulting Engineers, Inc. Range 5 E Address/Phone 1821� —72nd Avenue South Section 33 Kent, WA 98032/(425)251-6222 Part 3 TYPE OF PERMIT APPLtCATION Part 4 OTHER REVIEWS AND PERMITS ❑ Subdivision HPA ❑ DFW HPA ❑ Shoreline Management ❑ Short Subdivision ❑ COE 404 � Rockery � Grading ❑ DOE Dam Safety � Structural Vaufts ❑ Commercial ❑ FEMA Floodplain ❑ Other ❑ Other ❑ COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community Soos Creek Drainage Basin Green River Part 6 SITE CHARACTERISTICS ❑ River � Floodplain ❑ Stream � Wetlands ❑ Critical Stream Reach ❑ Seeps/Springs � Depressions/Swales ❑ High Groundwater Table ❑ Lake ❑ Groundwater Recharge ❑ Steep Slopes ❑ Other -1- 1]O1] TIR WORKSHEET.doc Part 7 SOILS Soil Type Slopes Erosion Potential Erosive Velocities Alder�vood (A C) 6-15% ❑ Additionai 5heets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT ❑ N/A ❑ ❑ ❑ ❑ Additional Sheets Attached Fart 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION I . � Sedimentation Facilities � Stabilize Exposed Surface � Stabilized Construction Entrance � Remove and Restore Temporary ESC Faalities � Perimeter Runoff Control � Clean and Remove All Silt and Debris � Clearing and Grading Restrictions � Ensure Operation of Permanent Facifities �� Cover Practices � Flag Limits of SAO and Open Space Preservation Areas � � Construction Sequence ❑ Other ❑ Other Part 10 SURFACE WATER SYSTEM � Grass Lined Channel ❑ Tank ❑ Infiitration Method of Analysis � Pipe System � Vauit ❑ Depression KCRTS Level 1 ❑ Open Channel � Energy Dissipater ❑ Flow Dispersal Compensation/Mitigation ❑ Dry Pond ❑ Wetland ❑ Waiver of Eliminated Site ❑ Wet Pond ❑ Stream ❑ Regional Detention Storage Brief Description of System Operation Uner ound i es convev storm�;�ater to under ound detention and WQ s stem in tract A prior to discharge into ex. i e system in Petrovisky Rd. Facility Related Site Limitations Reference Facility Limitation -�- I 1011 TIR WORKSHEET.doc Part 11 STRUCTURAL ANALYSiS Part 12 EASEMENTSITRACTS � Cast in Place Vault � Drainage Easement � Retaining Wall � Access Easement I � Rockery>4' High ❑ Native Growth Protecfion Easement ❑ Structural on Steep Slope � Tract � ❑ Other ❑ Other ' Part 13 SIGNATtJRE OF PROFESSIONAL ENGINEER I, or a clvil engineer under my supervision, have visited the site. 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TT � 2.0 CONDITIONS AND REQUIREMENTS SUMMARY II! 1 101 LOO�i.doc[DED.%dm] 2.1 Responses to Hearing Examiner's Conditions KING COUNTY HEARING EXAMINER'S CONDITIONS OF APPROVAL FOR PETRO VISTA KING COUNTY PROJECT NO. L02P0012 I. Compliance with all platting provisions of Title 19 of the King County Code. Response: This condition will be met with recording of the final plat. 2. All persons having an ownership interest in the subject property shall sign on the face of the final plat a dedication that includes the language set forth in King County Council Motion No. 5952. Response: This condition will be met with recording of the final plat. 3. The plat shall comply with the base density(and minimum density)requirements of the R-6-SO zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be as shown on the face of the approved preliminary plat, whichever is larger, except that minor revisions to the plat which do not result in substantial changes may be approved at the discretion of the Department of Development and Environmental Services. Response: This development is in accordance with the R-6 zone classification. 4. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 1 1 l 87, as amended (1993 KCRS). Response: Proposed road improvements are in accordance with the 1993 King County Road Standards. �. The Applicant must obtain the approval of the King County Fire Protection Engineer certifying the adequacy of the fire hydrant, water main, and fire flo�v to meet the standards of Chapter 17.08 of the King County Code_ Response: We are currently in the process of obtaining approval from the King County Fire Protection Engineer. 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location of lots as shown on the preliminary approved plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in KCC 9.04 and the Surface Water Design Manual (SWDM) must also be satisfied during engineering and final review. Response: This condition will be met with the approval of the construction plans. a. Drainage plans and analysis shall comply with the 1998 King County Surface Water Design Manual and applicable updates adopted by King County. DDES approval of the drainage and roadway plans is required prior to any construction. Response: The drainage plans and analysis are in compliance with the 1998 King County Surface Water Design Manual. -I- IIO11.00�.doc III - --_ � �-, b. Current standard plan notes and ESC notes, as established by DDES Engineering Review, shall ? be shown on the engineering plans. Response: These notes have been shown on the construction plans. c. The following note shall be shown on the fina) recorded plat: All building downspouts, footing drains, and drains from all impervious swfaces such as patios and drive�vays shall be connected to the permanent storm drain outlet as shown on the approved construction dra�vings # on file �yith DDES and/or the King County Department of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems, the systems shall be constructed at the time of the building permit and shall comply�vith plans on file." Response: This note will be shown on the finai recorded p1at. d. Storm water facilities shall be designed using the KCRTS Level One Flow Control standard. Water yuality facilities shall also be provided using the Sphagnum bog protection menu. As show�n on the conceptual drainage plan, the outlet of the detention pond and water quality facility �vill connect to the existing conveyance system along Petrovitsky Road and small areas of undetained flows will be used to maintain wetland hydrology within Tract B. Based upon the final drainage analysis, the size of the proposed drainage tracts may have to increase to accommodate the required detention storage volumes and water quality facilities. All runoff control facilities shall be located in a separate tract and dedicated to King County, unless portions of the drainage tract are used for recreation space in accordance with KCC 21 A.14.180. Response: Stormwater detention facilities have been designed using the KCRTS Level I Flo�� Control standard. The proposed water quality facilities have been designed using the Sphagnum bog protection menu. Please refer to the calculations and design enclosed within Section 4.0 of this report for further details on the detention and water quality facilities. e. The final drainage analysis shall evaluate the requirements for off-site bypass as outlined in the drainage manual on page 1-36. As noted in the design criteria, the contribution of flows to an onsite �vetland must be maintained and the natural attenuation of flows under pre-developed conditions must also remain. The design engineer shall evaluate all areas which may contribute offsite flows including the ditch along 118th Avenue SE. As noted in the applicants Level One Offsite analysis dated May 15, 2003, during major storm events the onsite wetland fills up and overtops to Petrovitsky Road and also backs up water across the south property line. The design engineer shall evaluate any potential flooding issues and provide drainage designs which adequately prevent potential drainage problems. As shown on the preliminary plat, an interceptor swale is proposed along the south property line of lots ]0 and I 1. Response: Please refer to Section 4.0 of this report for a detailed analysis of the off-site bypass and analysis of the on-site depression. £ 1�he final drainage plans and technical reports shall evaluate all applicable design criteria for onsite closed depressions and ponding areas as discussed in the drainage manual on page 3-54. 'The existing wetland in Tract B currently captures surface water from offsite areas and the western portion of the project area which may influence the storm water modeling for pre- and post-developed flow rates and volumes. During final engineering review, King County «�ill -2- 1 1 O 1 1.00�.doc review and determine how much offsite flow and/or undetained project areas may drain to the wetland in Tract B without pretreatment in detention or�vater quality facilities. Response: We have evatuated the on-site closed depression with our calculations sho�vn in Section 4.0 of this repor[ as well as the construction plans. Please refer to these documents for further details. g. 1'he final engineering plans and recorded plat shall show the 100-year floodplain boundaries as ' required by Special Requirements No. 2 in the drainage manual. Response: The construction plans show the ]00-year floodplain boundary for the on-sitc closed I, depression. The final plat wi}I show this same 100-year floodplain. ' 8. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: a. Southeast 176th Court shall be improved as an urban subaccess street. Response: S.E. 1 i6th Court has been designed as an urban subaccess street. b. One hundred eighteen (118th) Avenue Southeast shall be improved as an urban neighborhood ' collector along the frontage of the subject property. As noted in KCRS 2.03, for neighborhood collector streets intersecting with an arterial (SE Petrovitsky), the width must be 36-feet �vide for the first 150 feet. A 25-foot right-of-way line radius is also required as shown in KCRS 2.l 0. Response: 118th Avenue S.E. has been designed to be improved as an urban neighborhood collector along the eastern side of the existing roadway. As required, we have also provided a I 25-foot radius right-of-way dedication at the southeast corner of the intersection of 1 I 8th Avenue S.E. and S.E. Petrovitsky Road. c. One hundred eighteen (ll8th) Avenue SE is designated a neighborhood collector street which may require designs for bus zones and turn outs. As specified in KCRS 2.16,the applicant or his engineering consultant shall contact Metro and the loca) school district to determine specific requirements. Response: We are currentty in the process of coordinating with Metro to verify whether any bus turnouts are required along the frontage of this development. d. Street illumination shall be provided at intersections �vith arterials in accordance with KCRS �.05. Response: Illumination is already provided at the intersection of 118th Avenue S.E. and S.E. Petrovitsky Road. At this time we are not proposing any additional illumination. f. Modifications to the above road conditions may be considered by King County pursuant to the variance procedures in KCRS 1.08. Response: Acknowledged. 9. During preliminary site inspections, King County has identified fill material, building debris, and a concrete foundation within the site. To address the required site grading and designs for -3- 1 101 LOO�.doc development,the applicant shall submit a geotechnical report�vith the engineering plans to address all applicable earthwork, site preparation, road construction, and utilih� instailation. The geotechnical engineer shall also evaluate the soil conditions and requirements for the proposed storm water vault located��vithin Tract A. Structural plans and calculations for the vault must be prepared by a )icensed structural engineer. Response: T'his geotechnical report is included within Section 6.1 of this report. 10. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. Response: This condition will be addressed prior to final plat recording. 1 1. King County Code 16.82.150D requires seasona) limitations for construction within the Soos Creek basin. During the period October 1 through March 31, clearing and grading is not allowed unless certain provisions are complied with as outlined in the code. The applicants engineering plans shall demonstrate compliance with the applicable code requirements and provide notes referencing the seasonal limitations set forth in KCC 16.82.150D. Response: This note has been shown on the construction plans. 12. The applicant or subsequent owner shall comply with King County Code 14.75, Mitigation Payment System (MPS), by paying the required MPS fee and administration fee as determined by the � applicable fee ordinance. The applicant has the option to either: (1) pay the MPS fee at final plat �, recording, or(2)pay the MPS fee at the time of building permit issuance. If the first option is chosen, �, the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the ' face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System (MPS), have been paid." If the second option is chosen, the fee paid shall be the amount in effect as of the date of building permit application. Response: This condition will be met with the recording of the final plat or at the time of Building Permit issuance. 13. Lots within this subdivision are subject to King County Code 21 A.43, which imposes impact fees to fund school system improvements needed to serve new development. As a condition of final � approval, fifty percent (50%) of the impact fees due for the plat shall be assessed and collected immediately prior to recording, using the fee schedules in effect when the plat receives final approval. The balance of the assessed fee shall be allocated evenly to the dwelling units in the plat and shall be ! collected prior to buitding permit issuance. Response: These fees will be paid prior to the recording of the final plat and at the issuance of Building Permits. 14. There shall be no direct vehicular access to or from 118th Avenue SE from those lots which abut it, except lot 23. A note to this effect shall appear on the engineering plans and final plat. Response: The total lot count for this development has been reduced from 23 to 18. Lot No. 23 is now Lot No. 18. Notes to the effect of direct vehicular access to Lot 18 have been shown on the construction plans. � -d- I 101 I.00�.doc 15. The proposed subdivision shall compl}- �;-ith the Sensitive Areas Code as outlined in KCC 21A.24. ' Permanent survey marking, and signs as specified in KCC 21 A24.160 shall also be addressed prior to final plat approval. Temporary marking of sensitive areas and their buffers (e.g., �vith bright orange construction fencing) shall be placed on the site and shall remain in place until all construction activities are completed. Preliminary plat review has identified the following specific requirements which apply to this project. A11 other applicable requirements from KCC 21 A.24 shall also be addressed by the applicant. Response: Permanent and temporary markings for the sensitive areas have been shown on the construction plans. a. The Class 1 wetland near the east property line shall have a minimum buffer of 100 feet, measured from the wetland edge. Response: We have provided a buffer for this ��•etland. Buffer averaging will be used for this wetland buffer. Please refer to the��etland mitigation plans for further details. b. The Class 2 wetland near the north boundary of the site shall have a minimum buffer of 50 feet, measured from the wetland edge. Response: We have provided a buffer for this «-etland. Buffer averaging will be used for this wetland buffer. Please refer to the wetland mitigation plans for further details. c. The Class 2S stream shall have a miniminn 100-foot buffer, measured from the ordinary high water mark(OHW1�1). Response: We have provided a 100-foot buffer measured from the ordinary high water mark of the Class 2S stream located east of the site. d. The stream,wetlands and their respective buffers shall be placed in a Sensitive Area Tract(SAT). Response: We have placed these sensitive areas on the site into a separate tract. e. A minimum building setback line of 15 feet shall be required from the edge of the tract. Response: We have provided a 1�-foot building setback from the edge of the Sensitive Area Tracts. f. Buffer width averaging may be allowed by King County if it ��-ill provide additional protection to the wetland/stream or enhance there functions, as long as the total area contained in the buffer on the development proposal site does not decrease. In no area shall the buffer be less than 65 percent of the required minimum distance. To ensure such functions are enhanced a mitigation plan will be required for the remaining on-site sensitive areas. An enhancement plan shall be submitted for review during engineering review. Response: Buffer averaging is being proposed with this development. In no case is the buffer being reduced to Iess than 65 percent of the required buffer width. Please refer to the ��etland mitigation plans for details regarding this item. -�- I]Ol I.00�doc -- g. A mitigation plan and financial guarantee/bond will be required for any proposed impacts of ' sensitive areas including buffers. The bond amount will include all components of the mitigation plan including, but not limited to, plantings, grading, fencing, signs, inspections, and monitoring for five years. Response: This condition will be met prior to approval of the construction plans. h. Prior to commencing construction activities on the site, the applicant shall temporarily mark sensitive areas Tract(s) in a highly visible manner, and these areas must remain so marked until all development proposal activities in the vicinity of the sensitive areas are completed. Response: Temporary markings for the Sensitive Area Tracts have been proposed on the construction plans. These markings will remain in place until the development in the vicinity of these Sensitive Areas Tracts has been completed. i. Prior to approval of construction activities on the site, the boundary between the sensitive area Tract(s) and adjacent land shall be identified using permanent signs. Sign specifications shall be sho��vn on the engineering plans and shall be installed every 50 feet or as deemed appropriate by county staff at the time of engineering review. Response: Permanent sensitive area signs have been proposed on the construction plans to meet this condition. j. During engineering plat review the applicant shall provide a wetland hydrology analysis to demonstrate how the wetland hydrology will be maintained post-construction. I Response: Wetland hydrology analysis has been completed and shown in Section 4.0 of the Technical Information Report. k. Detention out-fall structures maybe permitted within the wetland/stream buffers, however, structures shall be located in the outer edge of the buffer, if possible. All buffer impacts shall be mitigated. Response: Drainage outfall structures have been located outside of the Sensitive Area Tracts. 1. Development authorized by this approval may require other state and/or federal permits or approvals. It is the applicant's responsibility to correspond with these agencies prior to beginning �i�ork on the site. Response: Acknowledged. m. The following have been established under SEPA authority as necessary requirements to mitigate the adverse environmental impacts of this development. The Applicant shall demonstrate compliance with these items prior to final approval. 1) A four-foot ta11 fence shall be constructed along the edge of the Sensitive Area Tracts B and C. The fence shall follow the common boundaries of the wetland tracts and the adjoining lots and road. Fencing details, construction and location shall be shown on the engineering plans for DDES revie�v and approval. This mitigation is intended to reduce disturbance �vithin the protective buffer and associated�vetland. I -6- ]IOI1.005.doc Response: A 4-foot-tall split rail fence has been proposed on the construction plans to meet this condition. 2) All existing structures and other debris shall be removed from the sensitive area tracts and the area shall be restored in accordance with KCC 21A.24. Response: The wetland mitigation plans will address this condition. n. The following note shal)be shown on the final engineering plan and recorded plat: Response: This note is sho�vn on the final construction plans and will be shown on the final recorded plat. RESTWCTIONS FOR SENSITNE AREA TRACTS AND SENSITNE AREAS AND BUFFERS Dedication of a sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health, safety and welfare, including contro) of surface water and erosion, maintenance of slope stability, and protection of plant and animal habitat. The sensitive area tract/sensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tract/sensitive area and buffer the obligation, enforceable on behalf of the public by King County, to leave undisturbed all trees and other vegetation within the tractlsensitive area and buffer. The vegetation within the tract/sensitive area and buffer may not be cut, pruned,covered by fill, removed �, or damaged without approval in writing from the King County Department of Development and 'I Environmental Services or its successor agency, unless othenvise provided by law. ' "I�he common boundary beh�een the tract/sensitive area and buffer and the area of development activity must be marked or othenvise flagged to the satisfaction of King County prior to any clearing, grading, building construction or other development activity on a lot subject to the sensitive area tracdsensitive area and buffer. The required marking or flagging shall remain in place until all development proposal activities in the vicinity of the sensitive azea are completed. No building foundations are allowed beyond the required 15-foot building setback (ine, unless othenvise provided by law. 16. The proposal is to combine the recreation and drainage tracts. A suitable recreation space shall be provided within the combined tract consistent with the requirements of KCC 21 A.]4.]80 and KCC 21 A.14.190(i.e., sport court[s],children's play eyuipment, picnic table(sJ, benches,etc.). a. An overall conceptual recreation space plan shall be submitted for review and approval by DDES, with the submittal of the engineering plans. This plan shall include location, area calculations, dimensions, and genera) improvements and landscaping. The approved engineering plans shall be consistent with the overall conceptual plan. Response: A conceptual recreation space plan is currently being prepared and will be submitted to King County for review and approval prior to construction plan approval. b. A detailed recreation space plan (i.e., landscape specs, equipment specs, etc.) consistent with the overall conceptual plan, and KCC 21 A.16 (landscaping code) as detailed in item a., shall be -7- I10] I.00�.doc submitted for review and approva) by DDES and King County Parks prior to or concurrent with the submittal of the final plat documents. Response: A detail recreation space plan will be prepared and submitted to Kin� County for review and approval prior to recording of the final plat. c. A performance bond for recreation space improvements shall be posted prior to recording of the plat. Response: This performance bond will be posted prior to recording of the final plat. 17. A homeowners' association or other workable organization shall be established to the satisfaction of DDES which provides for the o��nership and continued maintenance of the recreation, open space and/or sensitive area tracts. Response: A homeowners' association or other workable organization will be established for this development. 18. Street trees shall be provided as follows(per KCRS 5.03 and KCC 21A.16.050): a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along a11 roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. Response: Street trees will be provided for this development as required by this condition. Please refer to the street tree plan for further details. b. Trees shall be located within the street right-of-way and planted in accordance with Dra�ving No. 5-009 of the 1993 King County Road Standards, unless King County Department of 7'ransportation determines that trees should not be located in the street right-of-way. Response: Street trees will be provided for this development as required by this condition. Please refer to the street tree plan for further details. c. If King County determines that the required street trees shouid not be located �vithin the right-of- way,they shall be located no more than 20 feet from the street rig,ht-of-way� line. Response: Ackno��ledged. d. 1'he trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the County has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. Response: Notes to this effect will be added to the final plat documents. e. The species of trees shall be approved by DDES if located within the right-of-way, and shall not include poplar, cottonwood, soft maples, gum, any fruit-bearing trees, or any other tree or shrub �irhose roots are likel�� to obstruct sanitary or storm se��ers, or that is not compatible with overhead utility lines. Response: Street trees will be provided for this development as required by this condition. Please refer to the street tree plan for further details. -8- 1 101 1.00i.doc . f. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DDES prior to engineering plan approval. Response: The street tree plan will be submitted for review and approval prior to engineering plan approval. g. The applicant shall contact Metro Service Planning at 684-1622 to determine if 1 l 8th Avenue SE is on a bus route.If it is a bus route,the street tree plan shall also be reviewed by Metro. Response: V►�'e are currently in the process of coordinating with Metro on this item. If it is determined that that I I 8th Avenue S.E. is on a bus route, the plans will bc updated to provide the necessary improvements. h. The street trees must be installed and inspected, or a performance bond 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 inspection, if the trees are found to be instalted per the approved plan, a maintenance bond must be submitted or the performance bond replaced with a maintenance bond, and held for one year. After one year, the maintenance bond may be released after DDES has completed a second inspection and determined that the trees have been kept healthy and thriving. Response: The street trees�vill be installed and inspected prior to recording of the fina) plat or a performance bond will be posted. i. A landscape inspection fee shall also be submitted prior to plat recording. 'I'he inspection fee is subject to change based on the current County fees. Response: This condition will be met prior to recording of the final plat. 19. To implement KCC 21A.38.230 requiring retention of significant trees, the applicant shall show on the engineering plans that the significant trees retained within the sensitive area tract equal 25% or more of all the significant trees on the site. DDES Site Development Specialist shall inspect and verify this prior to the engineering plan approval and any site preparation work. Response: Please refer to the significant tree retention plan for details regarding this condition. ORDERED this 30th day of April, 2004. -9- 1 l01 1.00�.doc .-�i � 2.2 Hearing Examiner's Report and Decision �dated April 30, 2004 I, - - — - - ------ ----- � 0�:29/2004 13:56 4257096553 BENNETT DEVELOPMENT PtiGE ��_ __ , ; April 3a, 200a OrFTCE O�THE H�ARING EXAMIN�R Y�ING �OUNTY,WASHINGTON 400 Yes]er Way�Room 404 Seattle,_Washington 98]04 Telephone(206}296-4660 Flcsimitc(206)296-Ib54 CORR�CTTON TO REPQRT AND D�CTSl4N SUT3J�CT: Department of Development and �nvironmenta] Serviecs Filc No. L02P0012 Propased Ordinancc No.2004-4X43 pETRO VISTA Pceliminary Plat Application Location: Approximatcly on thc southeast corner of the intersection of 1 i 8'�Avenue$ovthe�,st and 5outhcast Petrovitsky Road � � Appl:cZnt: L�roy Sucveyors &Engineers Inc.,re�vresented by Pavl Grecn , Leroy Surveyors 8t Engineers,Ine. II I lb3 Shaw Road i Puynllup,Washington 48372 ' Telephone: (253)848-6608 King County: Department of Development and Environmental Services,represenred by Fereshteh Dehkordi ' �900 Oakesdalc Avenve Southwest Renton,Washington 98455-]2]9 Tcicphonc:(206)296-7173 �acsimile: (20� 296-6613 • This is a eorrected report nnd deeision that was mailed on April 29,2004_ 'J'hat report�nd decision states the incorrect ezse number and file n�me on pages 2 through I l. SUMM/1R�''O� b�CISION/RECOMMENAATION: Department's T'rcliminary Recommendation: Approve,subject to conditions DepartmenCs Fina1 ltecommendation: Approve, subjeet to conditions Examiner's Decisiott: Approve, subject to conditions 0�/29/2004 13:56 4257096553 BEt�ETT DEVELOPMENT PaGE 64:'1� `�; L02P0012—Pctro Vista 3 3. Dale VanDerscheldcn has fitcd a ptcliminaryplat application to subdivide 3.33 acres inTo 2� lots fot sing)c-family residentill development. Many of the sma11 R-6 zoned lots wi11 Uc constnicted with attached residcntial structures. The properiy is within a rapidly urbanizing area locatcd ��,�a�south of•Petrovitsky;Road;about,,lumilc,;cast:ofi�ts;intersectionfwithtthelBenson Highway.:,.cn K;i ��^'Al.�� 4. The major complications�viih respect to this ptat�ppli�ation relaie to wetland issucs. Thc tract B onsite welland functions ss a closed dcpression and overflows Petrovitsky Road to it5 north during mljor storm events. As a conscqucncc,most site drainage wit)Ue rerouted to a detention tract foc�tcd dircctly to the tvctland's east,with the wcdand itsclf only receiving a reduced flow sufficient to maint��in its hydrofogy. Since the�veilund will no longer be allowed to overflow, existing problems relating to drninage blcin�p on properties to the sovth �l�oulcl also be resolvcd. 5. An offsite wetland to thc cast and its outlet stream have been id�ntifrcd by DT�ES staff�s part of thc Soos Creek head�vaters system �nd assigncd�class 1 wettand rating and a class 2 S stream category respectivcly, Accordingly,the eastern flank of thc Petro Vista plat will be co�straincd by sensitive areas buffers. Moreovcr,DDES has determincd that the off'site siream is in hydraulic continuiry witll a downstream 6og,and the plat wiii be required to provide enhanced w�ter c�uality t�e�tment of site r►lnoff. G. Studcnts from Petro Vista will talk to Rcnton School Distriet schools, inc)uding Benson Elementary located at I 16'ti Avenue Southeast and Southeast I86`�Street. There :tre no sliouldcrs or sidewalks nlong 118'h Avcnuc Southeast sonih of thc p1at,but the roadway only carries a moderate nmouni of traffic. An altemative route further west via Petroviis[cy Road :�nd 1 l G`h Avenue Southe�st provides better wAlking facilities but is chamcterized by more tra�c_ In vicw of tl�c sm�ll size of the plat in the context of an arta-wide lack of walking facilitics, it is not appropriate to require thc Applicant to cure this ncighborhood defciency. CONCLUSIONS: I. If approvecl sttbject ta the conditions imposed below, the proposed subdivisian mlkes approPriate provision for the�ub)ic health,safety and welfare;serves the pvblic vse and interest; and meets the reqi�irements of RCVI�58.17.1]0. 2. The conditians of approval imposed herein, including dedications and easements,will provide ! improvements that promote Iegitimalc public purposes,arc necessary to serve thc subdivision �nd arc pro�ortional to its impncts; are required to make the proposed plat reasonably compatible �vilh the environmcnt;and will carry out a}�plicable state laws and regutations and the 1aws,policics and objectives of King County. DL-CTSION: The prcliminary plat appiieation for Petro Vista, as revised and received an Fcbniary 2G,2004, is APPROVEI�,subject to the following conditions of Final plat approval: 1. Compliance with a11 plattin�provisions o�'Title 19 of ihe King County Code. 2. All persans having an ownctship interest in the subject property shall sign on the face of the final - plat a dedication that includes the language set forth in King County Council Motion No, 5952. �I 0?/29/2004 13:56 4257096553 BENNETT DEVELOPMENT PAGE �_�� __ L02Pd012—Pccro Vista 5 e. The finfll drainage anaiysis sh�il evaluate the requirements for off-sitc bypass as outlined in the drainage manual on page 1-36.As notcd in the design�critcria, thc contribution of flows to an onsitc wetland must be maintained and the natura] attcnuation of flows under pre-developed conditions must also remain. The design engineer shnit evaiuflte all areas ��Iiich may coniribute offsite flows ineluding ihe ditch aIong 1 l 8'h Avenue SE. As noted in the appi'rcants Levcl Onc Oft'site�nulysis datcd May 15,2003,during major storm events the onsite wettand fills up and overtops to Petrovitsky Road and also backs up watcr across tftc south property linC. Thc dcsign engittccr sh�ll cvaluatc any potentiai flooding issues and provide drainage designs wl�ich adequate[y prevent patenti�►I drainage problems. As shown on the prcliminary piat, an interceptor swlle is proposed �long the south property line of lots l 0 and i l. f. Tl�e fina) drainage plans and technica) reports sha11 evaivate a11 applicabie design criteria for onsitc closed depressions:tnd ponding arcas as discttssed in the d1-:iinage mamial on page 3-54. The existing wetland in Tnct B currently captures surface water from ofrsiic areas and the w�stern portion of thc projcct area which may influence the storm v�ater modeling for pre-and post-developed flow mtes and votumcs. During final cngineering review,King County will review and determine how much offsit� fiow ancVor undetained project areas may drain to the wetland in Tcact B without pretreatment sn detention or watcr quality facilities. g. ?he final ertgineering plans and recorded plat shall show the l p0-ycar flooclplain boundaries as required by Spccial Rcquircmcnts No.2 in the dr�in�ge manval. 8. Tl�e proposed suhdivision shail comply with the 1993 King County Road Standards{I<CR5) including the following requirements: a. Soatheast 176'"Conrt shali bc improved �,s an urban svbaccess street. b. One hundred eighteen{i 18`�Avenue Southeast sha11 be impraved as an z�rban neighborhood collector along die frontage�f the subject property. As noted in KCRS 2.03,for neighborhood collector streets intersecting with an arterial (SE Petrovitsky), fl�e width must bc 36-feet wide for the first 1 SO feet, A 25-foot right-of way line radius is also required as�shown in IGCRS 2.10. c. Onc hundred cightcen(118`")Avenue SE is designated a neighborhood collector strect which may require designs for bus zones and turn outs.As spccified in KCRS 2.16,thc appiieant or his engineering consultant shall eontaet Metro and the Iocal sehool district to determinc specifc requirements. ,.,_ cf. Street itlumination shall be provided at intersections tvith artcrials in accordance witli KCRS 5.05. f_ Modifications to the abovc road conditions may be considered by King County pursuant to the variance procedures in KCRS I.08. 9_ During preliminary site inspections,King County has identified f11 material,building debris, and a concrete foundstion within the site. Z'o address the required site grading and designs for _ development, the nppiicant shall submit a g_eotechnical rcpori with the enginccring plans to address nll applict�ble earlhwork,site preparation, road construction,and utility installation. The 07!29/2004 13:56 4257096553 BE1�TT DEVEL�N�NT PAGE 0?i?� L02P00]2—Pctro Vista � geotechnical engineer shali also evaluate the soil conditions and requiren�ents for the proposed storm v��atcr vault located within Tract A. Struetural plans and calculations for thc vau)t must be prepared by a licensed 5tructural engineer. 10. All utiliiies within proposed rights-of-way must be ineluded within a franchise approved by tl�e King County Council prior to final plat recording, 1 l. King County Code 16.82.150D requires seasonal limitatior�s for construciion witl�in the Soos Creek Uasin. During the period October 1 tl�rough March 3l,C1eaRrig attd gt2t�itl�iS nOt aJlowed unless certain provisians are complied with as outlined in the cade. The applicants c»gineering plans s1�a31 demonstrate compliance with the applicable code requirements and provide notes rcfercncing the seasonal limitations set forth in KCC 16.82.I SOU. 12. Thc applicant or subsequent owner shalt comply with King County Code 14.75, Mitigation Paymcnt Systcm(MPS),by paying[he required Ml'S fee and administration fee as determined by tl�c applicablc fcc ordinancc. Thc applicant has.the option to either: (1)pay ll�c MPS fee at final plat rccording, or(2) pay thc MPS fcc at thc time of building permit issuancc. 1f t)�c firsi option is chose�l, the fee paid sha11 be the fcc in effEct at lhe time of plat application and a notc sE�al] be placed on thc facc of the plat that rcads,"All fecs rcquircd by King County Code {4_75, Mitigation Payment System(MPS},have bcen paid," ]f'the sccond option is chosen, the fee paid shal! Ue thc amount in effect as of thc date of buildi�g permit appti�ation. 13. Lots witl�in tl�is subdivision are subject to King County Code 2IA.43,whictl impuses impact fees to fund school system improvements necded to s�rvc new development. As a condition of final approval, fi�y pereent(50%)of ihe impact fees due for the plat shall be assessed and collected irr2mcdiately prior to recording,using the fee schedules i»cf�'cct whcn thc plat receives final approval. The balance o�the assesscd fcc sha11 be allocated evenly to thc dwcJ►ing units in the � plat and shall be collected prior to building permit issuanec. 14_ There sha)1 be no direct vehicular s►ccess to or from 1�8'�Avenue SE froni il�ose lots which abut it,except ]ot 23. A»otc to this cffcct shall appear on the engineering plans and final plat. 15. 71�e proposcd subdivision shall compiy with the Sensitive Areas Code as outlined in KCC 21 A.24. Permancnt survey marking,and sigr�s as sptcificd in KCC 21 A.24.160 shal I also be addressed prior to final plat approval, Tcmp�rary marking of sensitive arcas and their buffcrs (e.g.,with brigbt orange construction fencing)shall be plaeed on the site and shal) �emain in place until all construction activitics are completed. Pr�timinary plat review has identi�ed the following specific requirements which apply to tl�is project. All oihcr applicable requirements from KCC 21A.24 sha[1 also be addresscd by the applicant. a. The Class 1 wet]and near the east property linc shall have a minirnum buffer of 100 feet, I� measured from thc wcdand cdge. �, b. 71ie CJass 2 weiland near thc north boundary af the site shall have a minimum E�uffer of �' _ 50 feet,measured frvm thc wetland edge. 0?I29/2004 13:56 4257096553 BENNETT DEVELOPMENT PAGE ��'il_ . L02P0012—Petro Vista � c. Thc Ctass 2S stream shall have a minimum 100-foot buffer,measured from the ordinary high water mark(OHWM}. d_ Thc siream,wetlands and their respective buffers shall be ptaced in a Sensitive Aren Tract(SAT). e. A minimum building setback line of 15 feet shnll be required from tl�e edge of the tract. f. Buffcr width aver•tging rnay be allowed by King Covnty if it wilf provicie additional proteclion to the wetland/stream or enhance iherc fvnctions,as (ong;ts the total arca contained in the bui'fer on the developrnent proposal s+te does not decreasc. In no area shail the buffer be less than 65 percent of the required miaimum distance. To cnsure such futtctions are enhanced a mitigation pian wi11 be required for the remaining an-site sensitive areas. An erthancement plan shatl be submitted for review during cngineering review. g. A mitigation plan and finaneial guarantee/bo�d will be requircd for any proposed impnc[s of sensitive arcas iriclvding buffcrs. T'he bond amottnt witl include all comp�nents of the mitigation plar,including,but not limitcd to,plantings,grading, fencing,signs, inspections,and manitoring for five years, h. Prior to commencing eonstruetion activities on the site,ttze�pplicant sl�al) temporarily mark sensitivc areas Tract(s)in a highly visble manner,and these areas must rem�in so mark�d uniil all development proposal activities in the vicinity oFthc scnsitive nre�s arc complctcd. i. Prior to appro�al of constn►ction lctivities on the site,the boundary betwcen the sensitivc arcl Tr;tct(s) and adjaccnt Tand shall bc identified using pe�nanent signs. Sign specifications shafl be shown on the engineering plans and shali be installed evcry 50 fect or as deemcd appropriate by covnty sta1�'at the time of engineering rcview. j. Durin�engineering plat review thG applieant shall provide a wetland hydrology analysis to demonstrate how the wetland hydrology will be maintaincd post-constrvction. k. Detention out-fa11 structures mlybe permitted withi� thc wetlandJstream buffers, however, structures shall be located in the outer edge of the buffer, if poss;ble. Al! buffer impacts shall be mitigated. • 1. Deveiopmertt auttiorized by this approval may require other statc andlor fedcral permits or approvals. It is the applicant's responsibi[ity to corrcspond with these agencics prior to bcginning work on the site. m. The following have been established Under SEPA authority as necessary requiremcnts to mitigate thc adverse environmental impacts ofthis development. The Applicant shall dcmonstrate compliance with these items prior to finai approval. l)A four-foot tall fcrtce shaIi be conshvctcd along thc cdge of thc Sensitivc Area Tracts B and C. The fence shall follow the eommon bourtdnries of thc wetlnnd tracts and lhe adjoining lots 3nd road.Fencing details,construction and lxation shall bc shown on 07�29/2004 13:56 4257096553 BEMETT DEVELOPMENT PAGE ��=. _ _ ; L02POO12—Petro Vista 8 � � the engineering plans for DDES review and approval.This mitigation is intcndcd to reduce disturbance wiihin the proteet'rve buffer and nssociatcd wctIand. 2)A11 cxisting structures and othcr dcbris shall be removed fram tl�c sensitive area tracts and the area sha11 be re5tored in accordanee wilh KCC 21 A.24. n. The foltowing note shall bc shown on the final enginccring plan and recorded plat: I;�ESTRYCTIONS FOR SENSITIVE AKLA TRACTS AND SENSITIVF AREAS AND BUPFBRS Dedication of a sensitive�area traeUscnsitive area and buffer coaveys to the public a beneficial intcrest in the land within the tracdscnsitive area and buffer. This interest includcs thc preservation of native vegetation foz.all purposes that benefit the pvblic health,safety and welfare, including control of surface water and crosion,malntenancc of sIope stability,and protection ofplant and anima)habitat. The sensitive area tract/sensitive area and buffer imposes vpon all present and future owners and occupiers of tt�e land subject to the tracdsensitive area and bu;Ffer the obligation,enforceable on bchalFof the public by King County,to leave undisturbed all trees and otber vegetation within tl�e tracdsensitive areu and buffer. The vegctatioa within tl�c ttacdsensitive area ' and buf�er may not be cut,pruncd,cavered by �11,removed or damaged with�ut approval ' in writing fmtxt the King County Department of l�evelopment and Environmcntal Services vr its successor agency,unlsss othctwis�prov;ded by taw. The common boundary between the tractlsensitive arca and but�'er and tbe area of deveiopmeni activiry must bc marked or otherwise flagged to the satisfaction of King County prior ta any clearing,grading,building construction or other deveIopmcnt activity on a lot subjeci to the sensitive area tract/sensitivc arca and buffcr. 'The rcguired I marking ur flagging s�all xcmai» in piace until aIl development proposal activities in thc , vicinity of the sensitive area are completed. 'i No building fovndations are allowed beyond the required 15-faot building setback Iine, unless otherwise provided by Iaw.. 1 G. The proposa( is to combine the rccreation and drainagc lracts.A suitnble recreution space shall be pcovided wzthin the comhined tract consistent with the requirements oFKCC 2IA.14.I 80 and KCC 21A.14.190 (i.e.,sport court[s],children's play equipment,picnic tablejsJ,bcncl�cs, ctc.). a. An overall conceptual recreation space plan shall be submitted for review and approval by D�3ES,with the submittal o�'the engineering plans. This plan shall include Iocation, a�-ea calculations,dimensions,and general improvements and landscaping. The approved engineering plans shali be consistent with the overall-conceptual plan. b. A detailcd recreation spacc plan (i.e.,landscape specs, equipment specs,etc.)consistcnt with the overall conceptual plan,and KCC 2]A.16(landscaping code)as detailed in item a.,shall be submitted for review and approval by 1�DES and King County Parks prior to or concurrent with the subrriittal of the final plal documcnts. c. A performance bond fvr recrcation space improvements shall be posted prior to recording of the plat. B7/29/2004 13:56 4257096553 BEhINETT DEVELOPMENT PAGE 1��: i_ � L02P0012--Peiro Vistx 9 17. A homeowners'association or other worklble org�nizltion 5hai1 be established to the satisfaction of ADES which provides for the ownership ttnd continued maintenance of tbc recreation, open space anc!/or s�nsitive area tracts. 18. Street trees shall be provided as follows(perKCR$ 5.03 and KCC 21A.I6.450): a. Trecs shali bc planted at a rate of one tree for every 40 feet of fronlagc along ai1 roads. Spacing may be modif cd to eccommodate sight distance reqttirements for driveways nnci intcrsections. b. Trees sh�ll be locatcd within the street right-of-tivay and planled in accordance tivith Drawing No. 5-009 of the 1993 King County Road Standards,unlcss King County bcplrtment of Transportation detem�ines th�t trees should not be located in [hc strect right-of-way. c. If King County determines that the required street trees should not bc locatcd within tl�e right-of-way, they sh�il be )ocated no more than 20 feet from thc strcct right-of-way line. d. The trees sha11 be owned and maint��tined by the abutting lot owncrs or the homeowners :tcsociation or othcr wot'kable organization unless the County has adopted s►maintenance prognm. Ownership and maintenance shal)be noted on the face of the final recorded p1at. , ) c_ The species of trees shoil be approved by bDES if located within the right-of-way,�ind shafl not include poptar,cottonwood,soR maplcs�gum, any fniit-bcaring trccs,or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers,or that is not compatible with overhead utility lincs. f. Thc applicant shall submit a strect tree plan and bond quantity shcct for rcvicw ana npproval by DDES prior to engineering pl�n flpproval. g. ?he applicant shnll eontact Metro Serviee Planning ot 634-1622 to determine if 1 i 8'h Avenue SE is on a bus route.Tf it is a bus roLte,the street tree plan shall also be reviewcci by Mctro. � h. The strect trces must be installed and inspectcd,ar a performancc bond postcd prior to recording of the plat. If a performance bond is posted,the street trees must hc installcd and inspcctcd within one year of recording of the pIat. At the time of inspection, if tl�e trees are fonnd to be installed per the approvcd p]an, a maintenancc bond must Ue submitted or the performance bond replaced with a maintertance bond,and hcld For one year. ARer one ye1r,the maintenance b�nd may be released aRer DDES has complctcd a second inspection and detcrmincd that the trees have been kept healthy and thriving. i. A landscape inspection fcc shall also be submitted prior to�lat recording. Tlle inspcct�on Cec is subject to change based on the cutrent County fees. _ 19. To implement KCC 21 A38.230 requiring retention of significant trees,the�pplicant shaii sho�v on the cnginccting pians that the signiiicant tre�s retained within the sensetive arca tract equal 25%or morc of alt the significant trees on thc sit�,I�DES Site Development Spccialist sha11 inspect and verify this prior to the ertginEering plan �pproval and any site preparation work. 07/29/2004 13:56 4257096553 BENhETT DEVELOPMENT PAGE 11: 1_ �`. LQ2P0012—Petro Vista �0 i ORDERL=D tl�is 30th day of April,2004. r—._ .. . ��c.rt-d�. `�-^^�� Siafford�S ith �� King Counry Hcaring Exarniner TR.ANSMI'�TED tl�is 30t1�day of April,2004, to the pariies and interested persons of record� Ste�e F;ksdai eill a Jollene Good Paut Green John l.Scait Real Estate 18011-120th Ave.SE P.O_Box 7d0 3380-146th Pl.5E.#450 Ftenldl WA 98058 Puyaqup WA 98371 8etlevue WA 98007 Becky Kuberry Gsry Lindstrom .lefftey&i�ainia Manipcm 17509-118th Ave.SE,#C10 17632-1181h Ava_SE 10609 SE 252nd St. Rentdt WA 98058 Renton WA 98058 Kent WA 96030 Ron Noreen I�dark&M�heile Rulherford Seatlle KC HeaUh Dept. P.O.8ox SH2O2 17634-118th Ave.SE E Dtsl.Environ.Health Renton WA 98fl5F! Renlen WA 98Q59 14350 SE Eastgate Way Bepewe WA 98007 Gonavieve Sm1lh Da�VanDe►schelden �ale VanDerschelden 1 17636-1181h Ave.SE c/o leroy Surveyors d�Englneers,Inc. 21308 5nag Island�r.E. Rcnion WA 98051! 1103 SI18w Rd. Sumner WA 98390 Pvyallvp WA 98372 Greg Borba K1m Ctaussen Fereshleh Dehkordi DDESlI.US� DDES/LUSd DDES/LUSO M OAK-DE-0100 Cuaent Ptanri�ng CurreM Plarx�ing MS OAK-0E-010Q MS oAK-DE-0100 Peter Dye Nitk Gilten iG(sten Langley DDESJLUSU DDESlLUSD DDESll.USO �nglneerinq Review Site Developrnent Serv'ices �a�Use Treffic MS QAK-DE-01fl0 MS OAK-DE-0100 MS OAK-DE-010p , Carol Rogers Sieve Townsend Larry Wesi DDESIl.USD DDESILUSD �OESlLUSO MS OAK-DE-0100 Lanct Use tnspections Geo Revlew �as oaK-vE-otoo MS OAK-dE-0100 NOTICE OF RIGHT T4 APP�A,L In order to appea] tltc decision of the Examiner, written notice of appcul must be fled with thc Cicrk of the King County Council with a fee of$254.00 (cbsek payable to King County Office of Finance) on or befor� May 13, 2004. If a notiee of appeal is filed, the original and six (G) copies of a written appeal statement specifying the basis for the appcal and argument in support of ihe appeal must be filed with �hc Clerk of lhe King County Counci)on or before 11�ay Z0, 1004. Appeal Statcmer�ts may rcfer only to facts contained in thc hearing record;new facts may not be presented on appcal. 07/29/2004 13:56 4257096553 �TT DEVELOPMENT PAGE 12: :_ `'� L02POOt2—Pctro Vista 1 � � Filing requires actual delivery to the Office of thc C]erk of the Council, Room J 025, King County Courthouse, S 16 3nd Avenue, Seatde,Washington 98104,prior to the closc of business (4:30 p.m.) on tl�e date due. Prior mailing is not suffieient if actaal receipt by the Clerk does not occur witi�in the applicablc iime p�rivd. Thc Exami»ec does not have authority to cxtend the time period vnless thc Of�ce of t}ie Clerk is not open on the specified elosing date, in which event delivery prior to thc close of business on the next business day is sufficient to meet the filing requircmcn� Tf a writien notice of appcal and filing fee arc not filed within fouttccn (14} calendar days of the date of this report, or if a written appeal statement and argument are not �led within t,��enry-ane (21) calcndar days of the datc of this report, the decision of the hearing examiner contained herein shall be the finai decision of Kiag Counry without the need far furihcr action by ttu Council. MINUTES OF THE APRIL 27,2004, PUBLIC HEARING OI�I AEPARTMENT OF DEVELOPMENI' AND ENVIRONMEN'T'AL SERVIC�S�ILENO. L02P0�12. Stafford L. Smith was the Hearing Examiner in this matter. �articipating in the hearing we�e Fereshteh Dchkordi and Pete Dye,representing thc Dcpartmcnt; Paul Green, represcnting the Applic�nt, and 7effrey Manipon. The following exhibits werc o�fcred and entered into the record: Exhibit?�Io. 1 Department of Developmcnt and Environmentai Services File No. L02P0412. Exl�ibic No.2 Dcpartment of Develop�nent and Environmcntal Scrviccs Preliminary report,dated April 27,2004. ExhiUit No. 3 1lpplicatiozt dated June 17,2002. Exhibit No.4 EnvironmentaI Checklist dated Deccmbcr 19,2002. Exhibit No. 5 M�tigated Declaration ofNon-signi�cance datcd March 15, 2004. Exhibit No. 6 Affidavit of�osting indicating October 2�2002 as date of posting and DDES reccipt on ,, Octobcr 4,2002 ' Lxl�ibit No. 7 Rcvised site plan dated Febtvary 26,2004. I, Exhibit No. S Assessors maps NW 'h section of 33-23-5 &SW �/,section of 28-23-05_ ' Exl�ibit No.9 Level One Downstrcam Dcainage Analysis by Paul Grcen dated Septembcr 13,2002. ' Exhibit No. 1 U Rcvised Level One Off-site Drainage Analysis by Barghausen dated Muy l5,2003. I Exhib;t No. 1 l TrafFc Impact Analysis by TPE inc.datcd January 14,2003. Exhibit No. 12 Wetland Analysis Report by Wiltermood Associates,Inc. dated 3eptember 20, ]999. Exhibit No. 13 Petr�vitsky Off-site Wetland ltepoct by LeRoy Surveyors &�nginecrs dated 3anuary 5,2000. Exhibit No. 14 Adjaccnt Owncrs-Ortbophotograph , Exhibit No. IS Color Photograph ofBog Arca '� SLS:gaolms z,o2rao�z Rr�rz 2.3 SEPA Determination of Non-Significance dated March 15, 2004 • MqR 1 II � King County s2oa� Department of Development and Environmental Services ' State Environmental Policy Act (SEPA) Mitigated Determination Of NonSignificance for Plat of Petro Vista, KC File L02P0012 Date of Issuance: March 15,2004 Project: Subdivision of 3.83 acres into 23 residential lots together with associated road,drainage and recreation tract faciliries. Some af the lots will have attached residential developments. Location: Appro�cimately, Southeast corner of the intersection of 118'�Avenue SE and SE Petrovitsky Road. King County Permits: Subdivision SEPA Contact: Fereshteh Dehkordi Planner (206)296-7173 Proponent: Dale L. Van Derschelden c/o Leroy Surveyors& Engineers, Inc. 1103 Shaw Road Puyallup,WA 98372 (253)848-6608 Zoning: R-6 Drainage Subbasia: Soos Creek Section/Township/Range: NW%.33-23-OS Notes: A_ This finding is based on review of the project site plan dated February 26,2004;revised environmental checklist dated Dec�mber 19,2002; a Level One Downstream Drainage Analysis report dated September 13,2002,and revised May 15,20(}3; a Level One Flow Control&Downstream Analysis report dated January I3,2003; a Wetland Analysis Report dated September 20, 1999; an Offsite Wetland Report dated January 5,2000; a Traffic Impact Analysis report dated January 14,2003 and other documents in the file. B. Issuance of this threshold determination does not constitute approval of the permit. lfiis proposal will be reviewed for compliance with all applicable King County codes which regulate development activities,including the Uniform Fire and Building Codes,Road Standards, Surface Water Design Manual,and ihe Sensitive Areas Regulations. _ _ _ _ _ Petro Vista, L02P0012 March 15, 2004 � Page 2 Threshold Determination The responsible official finds that the above described proposal does not pose a probable significant adverse impact to the environmeni,provided the mitigation measures listed below are applied as conditions of permit issuance. � This finding is made pursuant to RCW 43.21C,KCC 20.44 and WAC 197-11 after reviewing the environmental checklist and other information on file with the lead agency and considering mitigation measures which the agency or the applicant will implement as part of the proposal. The responsible official finds this information reasonably sufficient to evaluate the environmental impact of this proposal. Mitigation List: The following mitigation measures shall be attached as conditions of pennit issuance. These mitigation measures are consistent with policies,plans,rules,or regulations designated by KCC 20.44.080 as a basis for the exercise of substantive authority and in effect when this threshold deternunation is issued. Key sources of substantive authority for each mitigation measure are in parentheses; however,other sources of substantive authority may exist but are not expressly listed. • A four-foot tall fence shall be constructed along the edge of the sensirive Area Tracts B and C. The fence shall follow the common boundaries of the wetland tracts and the adjoining lots and road. Fencing details, construction and location shall be shown on the engineering plans for DDES review and approval. This mitigation is intended to reduce disturbance within the protective buffer and associated wetland. • All existing structures and other derbies shall be removed from the sensitive area tracts and the area shail be restored in accordance with KCC 21 A.24. Comments and Appeals Written comments or any appeal of this threshold determination must be received by King County's Land Use Services Division prior to 4:30 PM Apri18, 2004. Appeals must be accompanied by a nonrefundable filing fee. PIease reference the file numbers when corresponding. Appeals must be in writing and state the perceived errors in the threshold determination,specific reasons why the determination should be reversed or modified, the harm the appellant will suffer if the threshold determination remains unchanged,and the desired outcome of the appeal. If the appellant is a group,the harm to any one or more members must be stated. Failure to meet these requirements may result in dismissal of the appeal. SEPA Detcrmination.doc 7/27/99 cic 3.0 OFF-SITE ANALYSIS Please refer to the enclosed Level 1 Off-Site Drainage Analysis prepared by Barghausen Consulting Engineers,Inc.,dated May l 5,2003. 1 1�I1.004.doc[DEDidm] LEVEL 'I OFF-SITE DRAINAGE ANALYSIS Proposed Petro Vista Plat Southeast Corner of 118th Avenue S.E. and S.E. Petrovitsky Road King County, Washington Y �q '�� • Prepared for: ��o w.+��s LeRoy Surveyors and Engineers, Inc. - y� �� Z _ 1103 Shaw Road _' Puyallup, WA 98374 J I� �� EY,PIAES 1 O�lO� May 15, 2003 Our Job Na. 11011 G HA Ci 4� - S Q' ��,� � CIVIL ENGWEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES m =}=- �' 18215 72No AvENUE SouTH KErvT,WA 98032 (425)251-6222 (425) 251-8782 FAx °y ? BRANCH OFFICES ♦ OLYMPIA,WA ♦ WALNUT CREEK, CA �� pg' www.barghausen.com r/~G ENG\N�f� r' : Table of Contents TASK 1 STUDY AREA DEFINTTION AND MAPS EXHIBI'I'A Vicinity Map EXHIBTT B Downstream Drainage Map EXI-IIBTT C Upstream Basin Map TASK 2 RESOURCE REVIEW EXH]BIT D FEMA Map EXHIBIT E Sensitive Areas Folios EXHIBTT F SCS Soils Map EXHIBIT G Assessor's Map EXHIBTT H Wetland Inventory Map BXHIBTT I Basin Reconnaissance Sum�nary Report TASK 3 FIELD INSPECTION ` EXHIBTT J Off-Site Analysis Drainage System Table 3.1 Conveyance System Nuisance Problems(Type 1) 3.2 Severe Erosion Problems (Type 2) 3.3 Severe Flooding Problems (Type 3) TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS EXHIBTf K Drainage Complaints TASK 5 MITIGATION OF EXISTING OR POTENTIAL PROBLEMS 11011.00I.doc(JPJfdm] TASK 1 STUDY AREA DEFINITION AND MAPS : TASK 1 STUDY AREA DEFINITION AND MAPS The proposed Petro Vista Plat is approximately 3.83 acres of land located within a portion of Section 33, Township 23 North, Range 5 East, Willamette Meridian, King County, Washington. More particularly, the site is located at I1925 S.E. Petrovitsky Road and is easily viewed on the enclosed Exhibit A — Vicinity Map, which depicts the exact location of the project site. The existing topography of the site has slopes ranging from 2 percent to 30 percent. The site tends to slope towards the north-centraI portion of the site and runoff collects in a closed depression and wetland area there. The vast majority of the site consists of second growth forest; however, there is a construction company office that is leased along the northeast comer of the site with another metal building behind it. More towards the center portion of the site is a storage yard for construction materials adjacent to the metal building. There is also a wetland area along the eastern property boundary of the site. The Bonneville Power Administration (BPA) transmission easement forms the eastem property line of the site. S.E. Petrovitsky Road forms the northern property line and 118th Avenue S.E. forms the eastem property line. An existing residential development zoned R-6 lies south of the site. The wetland area in the north-central portion of the site actually is created by a closed depression where runoff is infiltrated from the upstream basin and on-site basin when it collects there. However, during major storm events the wetland area dces fill up and overtop into the S.E. Petrovitsky Road right-of-way. UPSTREAM DRAINAGE ANALYSIS Based on the USGS Quad Map and our site visit, it appears that there is upstream flow onto and through the site. For the most part, areas south of the site and from 118th Avenue S.E. tend to drain onto and through the site. Please see E�chibit C— Upstream Basin Map for a complete overview of the upstream basin contributing runoff to the property. During major storm events this upstream basin may be actually larger in size than what is depicted on the Upstream Basin Map because runoff tends to overtop the right-of-way of 1 I8th Avenue S.E., which conveys runoff in ditches on both sides of the road. Runoff � from the west may cross 118th Avenue S.E. and discharge into the subject property as well. The property owner immediately south of the subject property indicated during the site visit that runoff from the upstream basin fills up within the subject property and backs up onto his property, prior to overtopping onto S.E.Petrovitsky Road. i 1101 I.00l.doc�7P1/dmJ EXHIBIT A Vicinity Map , ' � '? •�--I � �� 32N01 r ST�y=y. r �� / i I �� rsi s R � �3 1 J� '-�iuo sr i= � ■ i R � I i v�`ii y, m _� �m (EISURE AY . .:(p,M7 — - <fC � y� Ii]�n�, �, ! ?' �� fSTA7FS � Sr � arvrr i� 16 I ,,� 'sc �n �d- 1 ,�H s�i�5,�: � `; � ctrrJcar N rH° `. � `r \.+�r ` s� � , .� R�'Pl ,� R E N TO N _� =F�I ND �'�PL�1__ SE _-._- 136Ttf S7 yror�:< 1 �-� r �I trx u�l� :1�:.;" a'N � - .a � •z � 5."'�:p�..�1� ' ��a�� . I � -�p a:�'S�—---- -- n,c�.'=-�-=�t�' � �jPfl�`�� : ^ �[ »sn�:zT \ � ;m �° � �'_i_+aoo �<�_.! 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'� �-�m:w..n .. � �� .. nii�T•7.7�5i�—rw.71T+. rr�.n ,��>Ie�uaa�� ,.X.'. � -- ! - N I'03'14 ^- IJ!!.S! _- f,e. . . • 1�L�' � NE !!-?3.y � . _ .�� •�) ..� �� . • � ;-' au�wm�n.o�o�naw�rou e� ,�'(°��r.;�� -� 1� , ,.. :�.'Rc►G'•l%�T�c•n i1aeY � � ��,. � "' ��•��d� .Y��+�'� `'�'. � ._ �1!'i00uYW �r,i�',� :.��, � w I� � N � �i w � � E"� �i � 0 � W � TASK 2 RESOURCE REVIEW • Adopted Basin Plans: The site is part of the Soos Creek basin. • Finalized Drainage Studies: This is not applicable. - • Basin Reconnaissance Summary Report: Once again, the site is located in the Soos Creek basin. The Basin Reconnaissance Summary Report indicates a project is slated to be constructed in Boulevard Lane Park, which will be to construct a berm and proportional control weir there if the wetlands can maintain their integrity after the construction of the berm and weir_ It is not known if this project has been constructed or not; however, it was proposed ro help mitigate flow control problems in the upstream basin of Soos Creek. • Critical Drainage Area Maps: According to the Water Quality Applications Map in the 1998 King County, Washington Surface Water Design Manual (KCSWDM), basic water quality treatment is required. According to the Flow Control Applications Map, also in the 1998 KCSWDM, Level 1 Flow Control is required as a minimum. However, in spite of these water quality and flow control applications maps, King County has indicated in a letter dated February 20, 2003, addressed to Robert King of LeRoy Surveyors and Engineers, Inc., that for water quality purposes the site drains to Soos Creek Wetland No. 2, which is a sphagnum bog wetland that requires a special type of water quality pertinent to sphagnum bog wetlands. In addition,Level 1 Flow Control is not sufficient to meet the requirements for flow control for this project since it will impact the Trac[ B wetland with an increase of runoff volume, which will have a deleterious effect on the existing vegetation in the wetlands. • Floodplain and Floodway FEMA Maps: Please see the enclosed Exhibit D—FEMA Map utilized for this analysis. Panel No. 983 of 1,725,Map No. 53033C0983 F,revised May 16, 1995, and as indicated by this map, the proposed project site potentially dces lie within the floodplain or IIoodway of a stream along the eastern property line adjacent to the Soos Creek tributary. Please refer to Exhibit D—FEMA Map. • Oiher Off-Site Analysis Reports: A review of Exhibit I—Basin Reconnaissance Summary Report and the site invesiigation were conducted in prepazation of this Level 1 Drainage Analysis. The United States Department of Agriculture Soils Conservation Service Map is also provided. See Exhibit F. • Sensitive Areas Folios: Based on a review of the King County Sensitive Areas Map Folios, it was found the subject site dces not lie within any sensitive area; however, there are a couple of wetlands on the site and Soos Creek lies immediately east of the site, whose floodplain may impact the site,depending on topographic features. • Road Drainage Problems: This is not applicable. • United States Department of Agriculture King County Soils Survey: Based on the soils map for this area, the entire site is located within Alderwood-type soils, which are known to be till-type soils. • Weiland Inventory Map: The Wctland Inventory Map for this area is included. The site has one wetland on it; however, the entire site drains to Soos Creek Wetland No. 2, which is a large 11011.00I.doc(]P1/dmJ wetland comprising 134 acres. This known to be a sphagnum bog wetland and is highly sensitive. • Migrating River S[udies: This is not applicable. =� I 1011.001.doc(JP1/dm] A � � � � � � � � W W w LEGEND NATIONAL fL00D INSURANCE PROGRAM SPECIAL FLOOD r�znRo AREAS INUNDATED BY 100—YEAR FLOOD , ZONE A No base flood ele�rrti�ns delermn�ed. ZONE AE Base fl«�d elevariuns determined. F I RM ZONE AH Flood deptlu of t to 3 (eet luurally areas �r p«�d��,: � n�e �� e��m��a. FLOOD INSURANCE RATE MAP ZONE AO Fla�d depths � , �0 3 ,� ,,n,�,. � Ibw on sloping tenain); average deptAs delermined.Fw arcas of aNuvial fan ibodi�, velocities also detcrmined. KING COUN 1 i� ZONE A99 To be praected (rom 100.year flood by WASHINGTON AND F�e��, �� a��, �,em �^�� cons�r�ction; no base elevalicx�s determined. INCORPORATED AREAS ZONE V Coastal flood witfi velociry hazard Iwave act��nl;no base tl�wd eleva�ions determi�d. ZONE YE Coastal flood with �,el«iry hazard fwa�e PANEL 983 OF 1125 ��,; � +►� e�.�� ,m;�. i ISEE MAP INDEX FOR PANELS NOT PRINTED� � fIOODWAY AREAS IN ZONE AE OTHER FLOOD AREAS ��;�° ZONE X Meas d 5(1(�year flood;ar�as d 100-year Iloo�1 with average depths of le� tfwn CONTAINS: 1 (ool w witF� drainage areas ks than COMMUNflY NUMBER PANEL SUFFIX � Squa�e mile; and arex prrxecied by levees Irom t0p-year Ilood. Kir+� camn. OTHER AREAS UNHJCARPOHATED AREAS 530071 0983 F ZONE x Areas de[ermined to be outside 500- ar RENTON,CfTY OF S.'i0088 0983 F ye flOodp�ain. ZONE D Areas in which Ilood tuzxds are undetemiir.ed. UNDEVELOPED COASTA� BARRIERS � \ \ � , Identified Identified OtAenvise 7963 1990 Rdec[ed,4eas MAPNUMBER Coastal barrier areas are normally located within or adjacent �o Special 53033C0983 F H°°� "�`d �'� flood Bo�ndary Floodway Boundary ��G�r;CY ldA,y�P MAP REVISED: _ _ Zo„e D Boundary � �; MAY 16, 1995 gpundary o�,�9 �,� � � Hazard Zones, and Boundary p �� Dividing Areas o1 DiNerent `;r o t-� Coastal Base Ftood Elevations Within Special Flood Hazard Zones. Base Fbod Eleva�ion Line: Federal Emergency Management Agency 513 Elevation �� F��. s� Mao r,eex for Ele�ation Datum � Cross Section Line Base Flood Ele.vation in Feet IEL 9871 Where U�iforrn Within Zone. RM7 X See Map lndex fo� Elevation Datum. Elevation Reference Mark • MZ River Mile Horizontal Coordinates Based on North 97�07'30".32°22'30" American Datum ot t927 INAD 271 Rojetuon. P�-GHA��4 m � FEMA MAP � NORTH '�.„,� P,� S�v,.� ��.� in�c� J~�� ,� # �O Z � �, �Z SOUTHEAST �7 718TH LANE y�.Q N SOUTF+EAST �.'r � 120TH AVENUE SOUTHEAST r SOUTHEAS7�'��' 171ST LANE 1m a SE 772ND STREET �u, _ � � SOUTHEAST 172ND LANE � N � F-- a S�P�� Q Z ��3R0 �. = m SE 773RO S� � iQ � p v�i PLACE w � � n w SOUTNEAST F � ,L m � �174TH LANE O � � N � w � O O � � � � w j � rt� w a H � SO Ep51 1j5T � SOl1�HE� �i g 122ND AVENUE r 175TH �qNE SOUTHEAST �'�„ �5� E�j Q �0 � m F N ROAO � SE PETROVITSKY x �?��1283 U � �118TN AVENUE pE7AI ED STUDY BQ := ��-y- � ''C SOUTHEAST �,� ,t : � �- ZONE A 39`' "'�- �: , ' _ -'� w � � ;�_. '�-' � �.,:: � � � fi�,r-,;' Z `� J Q O �l � SOUTHEAST 168TH � PLACE 122ND PLACE SOUTHEAST SSP�� SOl1THEP'S� 178TH N W ZONE X o _ � � �� BO SOUTHEAS7 78pTH STREET p c x �- m i S 1815� S�FIEEj -Ni N j S�UZNEAS w o r- = v' a 32 � w o = � � W o � � Z W > Z a > w x a � m z > a mP�C,Ha�s�2 � r � FEMA MAP �� NORTH �� EXHIBIT E �� Sensitive Areas Folios Map Output Page 2 of 1 �K�9�Y � �� iMAP Print Pa ,,_ _ OY} Y RD °, s;'c� d .' 'c__ ,, �'.. aR"� \ -_ �AD�Y piffCU11#ITY " ' ' Legend � Sei6cted FaaAxes � �bud►v�aY �r' Gountp Bouridary � 140 Year FfnodWah �/ Sheets � 5A0 YNeUand �__3 Patiel � SAO I.bndside .r: lnoo+powted Asa � 5A0 Coa!►�i�e SAO Stream � 5AQ SeistNc � s:sa�i ;F'.x:� 8A0 Erosbn ^/ Cc�2aera� lar►dside Hazard Dwinage Area � L'7ts2s�i.-sar.a � �� C:nec 3 p,�d ..• u��od �/ Topo Contaurs-►Yes1 Ketg �_`; Lakes and Laige Rireis 20Q0 Cobr ImuyorY(VMosi K�g Coun(Y) e irJortnation inch�ded on this map has been compaed by King Cas►ty st�f Irom a variety of sour�es ard is s�jed b d�arx�e wlthout nodce. ng County makes no representatans or warrantias.express a implied,as to accwacy.oorrtipteleness,timelness.or rigt,ts fo Itroe use d such om�atiai.King Coisriy sha8 nd be lieble!a any general,spec;al.ndtreet,incide+Yal.or consequentia!damages±ndude�g,but not rmitad b. reverrues or bst protds resuriy from Ihe use or misase of the iMortnndon corrtained on this rt►ep.My sale of Q�a rt�a itama�m ' ma is bied ex D wi�ten issia�oi K" Coun , Ivng Countv�G�s Center I��I S�rvaes 1 G«r�enls I search By visAing th's and oiher Khg Coimty web pages,you expressty agree to be bound by tertns arul ca�cliions ot�e s+le.T�i� http://www5.metrokc.gov/servieVcom.esri.esrimap.Esrimap?ServiceNam�overvrew&Client Versio__. 5/SJ20E}3 tv�ap uutpu[ rn�c i vi i � King County � � � • � 3� � iMAP Print Pa e . �----�� {!, i 14241'0000 4`��4 I I lo I OT390(0065 .'\ � � ,��—� --�_ �� — — _ , _ Q � � , gE pETROVI_TSKYJiO � �� 2823Q�i9011 � — � i��,, 12 �� _ �, '� _,` '�.., � �'� .� '� , Y , \ : ' , ,, ,� E � '� . � �, � ';33�30bB021 9, 6196600381 61 '�� -�., : '�� '� ; , �� , ��, ,� � _ ti i; ',;�:'';;;'�_ � , - � ::` ,.� __ �?�45 r �� f,', 'I 1 2t g� 6196600423 '� ' `';,'";!.:' i%. � ' /: � �ti � 6� � �' �;:i � �_ ' \ � '�s1:��> -- I ' � � ;;sk�;; � � � '� � \ *� 67966004.{0 ' \ I \ \ I'� •.�c]2002KMGCOl1iI7;Y�� 1l+JdrAol�]I� \ I Legend I�I j� County 8oundary � 100 Year Floodplain I �/ Sireels � SAO YYetlartd ,I � Paroel � SAO Landside �,I � Inoorporatetl Area � SAO Coal N(ne , SAO Sheam � SAO Seesntic N �i .,.,.. 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King CounN�GIS Center�News�Services�Comments�Search By visiting this and other King Counry web pages,you expressly agree lo be bound by terms and conddions of the site.The details. http://www5.metrokc.gov/servleticom.esri.esrimap.Esrimap?ServiceName=overview&ClientVersio... 5/8/2003 Map (�utput Yage t ot � �� Kin9 CourrtY � �� • - � , iMAP Print Pa e ..��' � uWi ,l -- � - - —SEITSTN-$ � _`� �-=P , 'd0i0s� {Ott ry I i� � � t"� `, 2 i ��a g 'al 9oa9 �`� - _�- , '\ I � ��-� I � � ��' ! �� ' � ' � � � r I� � i �� ° +*-- i � I I �.=-i��, ��_� -� _�* �„� A ��— `�. _ I � � �� ' r _��(I{143 � $F pETROVI,SK1(RD -�+��^ �czGj1�=$Y 1� _ i`�` � _ J _,l' T .r _ -1 -.i`��`;��''•.�,_ i� i .i. 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Und�ied Inoorporated Area � Lakes�nd Large F�vers SAd$tream � Floodway � q�� 100 Year Fbodpla�l �l cr�2�� SAO Wetland (�*+f e iniormatan included on this map has been compi�ed by King County staft from a variety of sources and is subject to change wRhout notice. ing County makes no representations or warranties,express or implied,as to accuracy,completeness,timeliness,or rights to the use of such formatio�.King County shall not be liable for any general,special,indirect,incidental,or consequential damages includ'mg,bu1 not limited to, st revenues or bst protits resufling from the use or misuse of the information contained on ttiis map.Any sale of this map or intormation on his ma is rohibiled exce t b written ermission of Ki Coun . 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Unt3ae�d In[�orporated Mea � Lakes and Large i�vers SAO Stneam � �d+�Y � p�� 100 Year FlooAplan � �2��;� � SAO Wetfand t�+l e information included on this map has been compiled by King County statt from a variety ot sources and is subject to change wdhout notice. ing County makes no representations or warranties,express or implied,as to accuracy,completeness,timeliness,or rights to the use of such �fortnation.King County shall not be liable for any general,special,indirect,incidental,or consequential damages including,but not limited to, st revenues or bst protits resuqing trom the use or misuse of the�fortnation conta�ed on this map.Any sale of this map or intormation on is ma is rohibi[ed exce t b written ermission ot Kin Coun . KincLCountv�GIS Center�News�Services�Comments�Search By visiting this and other King County web pages,you expressly agree to be bound by terms and conditions ot the sile.The details. http://www5.metrokc.gov/servleUcom.esri.esrimap.Esrimap?ServiceName=overview&ClientVersio... 5/9/2003 .� EXHIBIT F I � � SCS Soils Map c�� 11 � �� 1 � � V• saa�aa�a�� v. ) Q �i �' � " �� , , ��• m . ... .... E �� . . w • a' =ea' yy� � �� t i m .R.4..� � .¢ •�s � :. :. u � • �; ;; i N �' U • F,°G N "... �� •,� t: V / � °� � �' � °�: . � F ��b °� �� . J�v P; -' I, � • i • Pg0 O. q /� �..�^ '' , ..1, , .. ,ii, U � �� ,,, •,�(,' i a 4 � r o0p� ' m E ii m °� m = ��KPg. I . J I '� �.Q . ' Q a : il W � f� � � � � � ��I °� '� � • Y � gtio , s p� �oi�. W • � Oqp`� N .i1 1�.....•. 'I Q � .. _�.. 11 m � � . � ,:11 > . � i l� •' II W • , ' i'i °Y� p . d � ^ �' � // vG • ��• ____ �•�`_'� N �J�' Z w / ��b� i d °�� .� �• n• O ' '� .. i � � — — — 4-- -- ---- — �� ♦_ —_�--'--- • � s �_' P4' • �G1.• o a ,:d�/ g 4�.< �� m _--��•^ � (• _ _ Z— � m,: i� �•Z, �� :: � � � ��' � I J';d.� •' �c y • moq ��• '��. �y\aE �. � � �i�� Q� .. {� � , N • � Q . U ii � .b�. " � .�PE%� 4 � .'� ''/t" ,Y . �S� • I~•' �' ii � � �r P\/ .� Pg ac vl .�i�:ti' m 's�I, a� ''�' u `J.r��-�/ F�� I '� +aa11 � W � � �.�,Y ii ' � ] ' �p �1� • � � �� ,�n • •' '��' ° y � . ^' '� E �� /'1„-.� ° � � .\ I}. °� • � (V -- ---- '� �._. _ _ _ `��w i � � ,.Y � :t„`r�� . sc%�� A � :�• •• Z � v Q1 J < �� p � s• • � _•,• ..0 n �� ,�P+ ♦9 0 F� 111' Q„4► ••• n P'g U �... mpp �� [ � � pU.-�'�+h:.•"m ' .. � � ��i Q Y� y � - . 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'� , � ••�,', v • .•::��. o V E � 'O . . O �� y � r• ' ' ••e� • �� I, Q �a . �: � �� • 4Sb, � s' U o y • . � � U ' . -r-• u � m U� , � °� �� i . r�''e ' E°8 m E . 1 � . / � m 0 � arn �.�t J: • u� � •' , Q� , �a C U / � � E 1 � � � '� m F o '� , 1 Y a� _ �� _ _ � .! _ �_�mN _____ ^I m _ I �� 11 �' �Q� �' Q ^r. �J�L , 1/'r \ � ' v ti�IO � V � . ^ PJ�' i . �_��_ ��. . . � 1 m •�,�, K Ci • •II C GP P�4 II � k EVf {� .�: �� "-',` `° ' 'i •E• • �� v �, ••�...:.� • `"•?. �7" II. il. - . 1 � - . ,. Ag� � . ,E ( ii• '�� '• 1 '• i b:� Vpp ¢ � � .�� • �� • • .i� ..•, � ' _�y" y� � �` a • t � •� E � . ` v . ii, . •'t i . � • . 1 1 •Y • � : � A6 N rn � � � �� . . .. . � �0 . • �• .. t �' . _ d i � � n 'I GUIDE TO MAPPING UNITS For a full description of a mapping im it, read both the description of the mapping imit and that of the soil series to which the mapping tmit belongs. See table 6, page 70, for descriptions of woodland groups. Other •information is given in tables as follows: Acreage and extent, ta}�le 1, page 9. Town and country planning, table 4, pagoe 57. Engineering uses of the soils, tables 2 and 3, Recreational uses, tabie S, page 64. pages 36 through 55. Estimated yields, table 7, page 79. Woodland Described Capability imit group Map , on symbol Mapping imit page Symbol Page Symbol Ag6 Aldeiw ood gravelly sandy loam, 0 to 6 percent slopes---------- 10 Ne-2 76 3d2 _ AgC Aldeiwood gravelly sandy loam, 6 to 15 percent slopes--------- 8 Ne-2 76 3d1 AgD Alden.00d gravelly san y oam, to 3 percen s opes-------- IO VIe-2 78 3d1 AkF Alden+ood and Kitsap soils, very steep------------------------ 10 VIIe-1 78 2d1 AmB Arents, Aldeiwood material, 0 to 6 percent slopes 1/---------- 10 IVe-2 76 3d2 AmC Arents, Aldeiwood material, 6 to 15 percent slopes 1/--------- 10 Ne-2 76 3d2 An Arents, Everett material 1/----------------------------------- 11 Ns-1 77 3f3 BeC Beausite gravel2y sandy loam, 6 to 15 percent slopes---------- 11 IVe-2 76 3d2 BeD Bea�site gravelly sandy loam, 15 to 30 percent slopes--------- 12 VIe-2 78 3d1 BeF Beausite gravelly sandy loam, 40 to 75 percent slopes--------- 12 VIIe-1 78 3d1 Bh Bellin�am silt loam------------------------------------------ 12 IIIw-2 76 3w2 Br Briscot silt loam--------------------------------------------- 13 IIw-2 75 3w1 Bu Buckley silt ioam--------------------------------------------- 13 IIIw-2 76 4w1 Cb Coastal beaches----------------------------------------------- 14 VIIIw-1 78 --- Ea Earlmont silt loam-------------------------------------------- 14 IIw-2 75 3w2 Ed Edgewick fine sandy loam-------------------------------------- 15 IIIw-1 75 201 EvB Everett gravelly sandy loam, 0 to 5 percent slapes------------ 15 IVs-1 77 3f3 EvC Everett gravelly sandy loam, S to 15 percent slcrpes----------- 16 VIs-1 78 3f3 EvD Everett gravelly sandy loam, 15 to 30 percent slopes---------- 16 VIe-1 77 3f2 S+C �Everett-Aldeivrood gravelly sandy loams, 6 to 15 percent slopes------------------------------------------------------ 16 VIs-1 78 3f3 InA Indianola loamy fine sand, 0 to 4 percent slopes-------------- 17 IVs-2 77 4s3 Indianola loamy fine sand, 4 to 15 percent siopes----�-------- 16 IVs-2 77 4s3 Indianola loamy fine sand, 15 to 30 percent slopes------------ 17 VIe-1 76 4s2 n Kiisap silt loam, 2 to 8 percent slopes----------------------- 17 IIIe-1 75 2d2 KpC Kitsap silt loam, 8 to 15 percent slapes---------------------- 18 IVe-1 76 �d2 KpD Kitsap silt loam, 15 to 30 percent slopes--------------------- 18 VIe-2 78 2d1 KsC Klaus gravelly loamy sand, 6 to 15 percent slopes------------- 18 VIs-1 78 Sfl Ma Mixed alluvial land------------------------------------------- 18 Viw-2 78 201 NeC Neilton very gravelly loamy sand, 2 to 15 percent slopes------ 19 VIs-1 78 3f3 Ng Newberg silt loam--------------------------------------------- 19 IIw-1 74 201 ADc Nooksack silt loam-------------------------------------------- 20 IIw-1 74 201 No Tbrma sandy loam---------------------------------------------- 20 IIIw-3 76 3w2 -Or Orcas peat---------------------------------------------------- 21 VIIIw-1 78 --- I Os Oridia siit loam---------------------------------------------- 21 IIw-2 75 3x1 I OvC Ova21 gravelly loam, 0 to 15 percent siopes-----------------— 22 Ne-2 76 3d1 ' OvD Ovali gravelly loam, 15 to 25 percent slopes------------------ 23 VIe-2 78 3d1 OvF Ovall gravelly loam, 40 to 75 percent slopes------------------ 23 VIIe-1 78 3d1 Pc Pilchuck loamy fine sand-------------------------------------- 23 VIw-1 78 2s1 Pk Pilchuck fine sandy loam-------------------------------------- 23 IVw-1 76 2s1 Pu Puget silty clay loam----------------------------------------- 24 IIIw-2 76 3w2 Py Puyallup fine sandy loam-------------------------------------- 24 IIw-1 74 201 RaC Ragnar fine sandy loam, 6 to 15 percent slopes---------------- 25 IVe-3 77 4s1 RaD Ragnar fine sandy loam, 15 to 25 percent slopes--------------- 26 VIe-2 78 4s1 RdC Ragnar-Indianola association, sloping: 1/---------------------- 26 Ragnar soi2--------------------------------------------- -- IVe-3 77 4s1 Indianola soil------------------------------------------- -- IVs-2 77 4s3 RdE Ragnar-Indianola azsociation, moderately steep: 1/------------ 26 -------- -- --- Ragnar soil--------------------------------------------- -- VIe-2 78 4s1 Indianola soil------------------------------------------ -- VIe-1 77 4s2 • U.S. COYERNMENT PRfH'CIIiC OFFICE:19T�O-48L-]66 GUIDE TO MAPPING UNITS--Continued Moodland Described Capability tmit group Map on ; symbol Mapping �m it page Symbol Page Symbol Re Renton silt loam-----------------------------------------— 26 IIIw-1 75 3w1 Rh Riven.�ash---------------------------------------------- 27 VIIIw-1 78 --- Sa Salal silt loam--------------------------------------------- 27 IIw-1 74 201 Sh Sammamish silt loam----------------------------------------- 27 IIw-2 75 3w1 Sk Seattle muck--------------------------------------------- 28 IIw-3 75 --- Sm Shalcar muck------------------------------------------------ 29 IIw-3 75 --- Sn Si silt loam--------------------------------------------- 29 IIw-1 74 201 So Snohomish silt loam----------------------------------------- 3p IIw-2 75 3w2 Sr Snohomish silt loam, thick surface variant------------------ 31 IIw-2 75 3w2 Su Sultan silt loam—------------------------------------- 31 IIw-I 74 3w1 Tu Tukwila muck----------------------------------------------- 32 IIw-3 75 --- UrU�an land-------------------------------------------------- 33 -------- -- --- Wo Woodinville silt loam--------------------------------------- 33 IIw-2 75 3w2 1/ 7he composition of these imits is more variable than that of the others in the Area, but it has been controlled well enwgh to interpret for the expected use of the soils. � I .� EXHIBIT G I � Assessor's Map . ;�,- v`.� � , �'%` �*'�'`��f �,»v,�oo.�� '' �� , ar ! . �,wa u Yfi.t::l�� '�. 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I ��q uY�tq� . � 0��OIM�Qa . , t V.,�� i EXHIBIT H } Wetland Inventory Map � Ce��' � Lower Cedar Rfver Greea �ti 2� �� - �� . 5 • el' �� $ 6 B$g• �Cj � g I.� 7 'e y0 2 �� 15 75 ,� 16 20 � 23 81 Black River 25 24 27 62 .Tenkins Creek `�' 26 2 �61 80 30 33 SOOS 29 Creek �338� E 3�-98 �H � �rid I 51 50 87 7 ` 1 s � 49 52 � r� �c�" 54 � 55 � Lower Green River �� 58 �ing�on Creek 67 qc "ot�J'a �G 86 Middle Greea River Mi1e N o 'r4 7 I Soos Creek I'' . � � i Green River Basin �. � . �f, -� ..�;� . . � ,� " ; 4 :`,:' , '^� � _: `. � A - �+i•�R '-) r�ie:,� ,z�� ,.a;T "` � �,� ,`'..Y',x �•j� � y `: 'k. `` �a_� + � �+ 1.� +M - � 4` _;jf•� �:-.j�,�.4�-�' .�, .�,, �. 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I� � e' � y �f r � - - ^ .+r.� :' 'F - .f '.-+ ,„��l��a� . x �r �' �,_ ,_.^ t �.�' I {� ,.;y,�✓^ "� $..�J r�. � �. i _ T*�,w � 3. -F:_ � f �r. .�� T '7�l � l {y-�ri f ti' � _a �* �r� .lx3Y y _ _ _d :'� '�`'iL _i S ' iK �z ,� . ♦ `•f�� L 'a � P .r ♦ ¢i.��}� �~� �-�e''�''c ..� .�. �! . � � � # -` �i� .�5. ��'-�\r � � � �� . .�� '°'�" 1,1"�t �` �v: �iF-`'.�l ��11.. -�r.i'7�t 4 � � �':+F ...-3T/J.tY�'�' ..`..� h, �i� � •-�[ �..� ^� ,�,� �. ��jh y�� , � w. _� !r , ),,, �„�,� .� `��. .. `� d,�"� � r� l. 1 �.S .�'�'..�h l[� L ��' '��rj-.Yf 3.,. � .r ; -•'T4'. 'r�• !► �� . ti�1 �t t jY� tTr�. .Y s::. � .Y. � ~� � ' • ' '' ;�r��. �" -�'. Y/ �� r/J�S � '��s�''s. :�' �. ��,. �"�� ;�;5� v '�?! s-..t�'s�wTr+ S""+i� �. MJ_ � �� F �= �r:_ •�j r�S'�s'. t �. � _ , 4''T j� _ ' ��s � ...�,�,r � � ta . �� . ,��,. ;r: i� ti'��" �.'ti "E �-: j'� :��e '�� : Y�'�"' s�� ;' �� i► � .j, .; .c t.� )r� I . .P ' '�r�. ' � s��,�. - =,�+��, � ��'� . ...y,�'` , i.F. s ^♦ ' � � ,•y ' ` �_4 �� }' �A � ��t '4r�`•y/ . --,:aa. �t.. .} r_�� '"<�1 .:., � �..�. . . ►''. ' • � � . • :1 • • �• � /// � � •� - • •� � . � . • • • L • � ' � � . . . � ' � • i ► • • • � � � � . • • • : �. � � � -� f- • • � � • � � l •. � C�� '1 • . 1 . f I � t � I 'I '1 / '/ I 'I � I �t � �1 ' �• ' I • I ' • • / � • Soos Creek 2 OBSERVED SPECIES: (refer to list in Appendix 1) � - Trees: AR, PT, TS, TP } Herbs: LA, MU, OS, PH, RR, SD, TL � Shrubs: AC, CS, GS, LL, RP, RS, SX, SD I Sedges/RusheslGrass/Fern: SE, BX, AX, AF, CX, EX, JE, JX, LM, ,PA I Bi►ds: �8, MA, VS, TS, BS, RB, AR, ST, MW, SS, YT, YW, WW, RS I Mammals: Fish: Other. OF RARE/ENDANGERED/THREATENED SPECIES: (refer to list in Appendix 2) Recorded/Observed: Poterrtiai: SIGNIFICANT HABITAT FEATURES: OUTLET: TYPe� Pipe, Overland, Undefined Condition: pPe� Outflow emen: Stream POTENTIAL STORAGE: ExistingActive: 786 ac. ft, Potential Active: 258 ac. ft. GENERAL OBSERVATIONS' Litter from park on south edge. Fi11 pushed into wetland from west edge. Ponds artificial. Bog area is drying up. �� ETLAND EVALUATtON SUMMARY: Date was collected i� tfie five categories shown below. Within each category the dffia was evaluated to produce numerical values. Composite values for each category were produced in order to compare each wetland to other weUands in its wb-basi�and in Ki�g County. The rewlt of that comparison was a percentile rank. The percentile is expressed on a scale of one hundred and indicates the percent of wetlands that soored equal to or below that particular site. For example,a percentile rank of 80 under wb-basin means that the wetla�d scored equal to or better than 80 percent of all sites within the wb-basin for that evaluation category.NOTE: The percentik ranks are valid only within the individual evaluation category and are intended solely for reference and comparison. Rank Eraluation Ca�eg�ry Iby percentile) Sub-basin County-wide Hydrology: runoff storage potential,water quality,potential for minimizing d�nage 94 98 in downstream areas BIOIOgy: quality of habitat,abundance and diveaity of plant arxl animal species 9�t 81 Viwal: diversity and contrast of wetland and wrrounding vegetation, 96 22 wrcounding landforms CUItUr'dl: types of acceu,proximity to schools/imtiwtio�s,overall 23 35 environmental quality EoOnomic: presence of agriculture/peat extraction,anadromous or game fish, 33 12 game birds or mammals of commercial value WETLAND RATING: Each wetla�d was assigned one of three pouible wetland ratings. The wetland ratings were determined by examining the scores of selected " ,•tory tasks, specific data or percendle ranks for individual evaluation categories. The criteria used to assig� the weUand ratings are � 'ibed i�tha Inuoduction. For each rating a number of specific guidelines fw new development in or adace�t to wetlands were prepared. � e guidelines are intended to auist in carrying out King County's Se�sitive Areas Ordinance and other wettand policies. They ere included in a seperate report titled"Guidelines for King County Wetfands". Wetland Rating: 1 (�� EXHIBIT I I Basin l�econnaissance Summary Report �', RECONNAISSANCE REPORT NO. ? SOOS CREEK BASIN JANUARY 1986 Natural Resources and Parks Division and Surface Water hlanagement Division _ King County. Washington King couoty F�e�,tive Tim Hiil I King Couaty Couocil �� Audrey Gruber, District 1 I • Cvnthia Sullivan. District 2 �'� Bill Reams, District 3 lil L,ois North. District -t Ron Sims. District 5 �� Bruce taing, District 6 Paul Barden, District 7 Bob Grieve. District 3 Gary Grant, District 9 Department of Public Wor�cs Pdrks, Plannin� and Resources Don LaBelle, Director Joe Naael, Director I I Sur[ace Water Management Divi.sioo Naturat Resources and Parks Division ' Joseph J. Simmler, Division Manao r Russ Cahill. Division Mana�er Jim Kramer. Assistant Division ManaDer Bill Jblty. Acting Division Mana�er Dave Clark, hiana�er, River S �'Vater Derek Poon, Chief_ Resources Plannin; Sertion Resourre Section Bill Ecke(. Manaper, Basin Plannin, Pro�am i Larrv Gibbons, Manager; Project I Management and Design Section , Contributing Sta[f Contnbutiag Staff Doug Chin, Sr. Enraneer Ray HelIer, Project Manager � Team Leader Randatl Parsons. Sr. En,ineer Matthev� C1ark, Project Mana,er Andv Levesque. Sr. Engineer Robert R Fuerstenberg. Biotogisc �� Team Leader Brure Barker, En�neer Matthew J. Bruen�o, Geolo�st Arny Stonkus, En�neer Lee Benda, Geolooist Ray Stei;er, En�neer Dereic Booth, Geologist Pete Ringen, En�neer Dyanne Sheldon, Wetlands Biolo�st �ndv Baker. Earth Scientist Di Johnson, Plannina Support Techni�tian Robert Radek Ptannina Support Technician Ranciai Bays. Plannin� Support Technician Fred Bentter, Plannin� Support Trchriician Consulting Staff Maric Hudson, Plannin� Support Technician Sharon Clausen, Plannin, Support Terhnirian Don Spenrer. Assa-iate Geologist, Earth David Truax. Plannin, Support Technician CoRsuttants. Inc. Brian Vanderi�urg,. Pfannin; Support Technician John Bethet. Soil Scientist. Earth Carolvn M. Bverlv. Technical �'Vriter Consultants, Inc. Susanna Horni�, Technical Writer Vir�inia Nevwman. Graphic Artist I�iarcia MeNultv. Typesetter I Mildred Milier Tvpesetter Jaki Reed. Tvpesetter Lela Lira. Office Techni��ian htarty Cox, Office Technician • � I P:CR I • � �� TABLE OF CONTENTS I. SUMMARY 1 II. INTRODUCTION 1 III. FINDINGS IN SOOS CREEK BASIN 2 A. Overview ? B. Effects of Urbanization 3 G Specific Problems 4 i 1_ Bank failures 4 ? Channel erosion 4 3. FioodinD and potentiai floodin� 4 4. Stream habitat �l 'k � IV. RECOMMENDATIONS S A. Inform appropriate governmental agencies of 5 the reconnaissance findin� � B. Reevaluate speci�ic surface water management 5 policies G Prepare a comprehensive basin ptan 6 D. Construct the capital improvement projects 6 E. Maintain or enhance instream and riparian habitats 6 V. M.�►P 7 APPENDICFS: APPENDIX A: Estimated Costs A-1 APPENDI;C B: Capita! Improvement Project Ranking B-1 APPENDIX C: Detailed Findin� and Recommendations C-1 I. �Y -- � '� The Soos Creek Basin is located north and east of the Green River in King Countv_ While the southern and eastern portions of the basin are rural, the remainder is a rapidly expanding suburban community. This devetopment pattern has not caused serious environmental damage or flooding, however, due to highly pervious soils, an extensive � network of streams and wetlands that pro�vide natural storage for stormvwater runoff, and the fact that development has only recently accelerated in this basin. Although the overatl severity of problems in the Soos Creek Basin was not �-eat at the time of reconnaissance, several si�iGcant problems were identified and shoutd be addressed_ These include bank faitures, channel erosion, flooding in some locations, and poor stream babitat Recommendations to address these problems include efforts to 1) inform appropriate agencies of the reconnaissance findings, 2) reevaluate speci5c policy issues regarding the management of surface water, 3) prepare a comprEhensivc basin plan, 4) mnstrud the capital improvement projects evaluated with citizen advisory committee criteria, and � maintain or euhance habitat throughout the basin. II. IN"I"RODUCTION: I-�istory and Goa1s of the Progiam In 1935 the Kino County Council approved funding for the Planninp Division (naw called the Naturat Resources and Parks Division), in coordination with the Surface Water Management Division, to conduct a reconnaissance of 29 roajor drainage basins located in KinD County. The effort began with an initial investigation of three basins —Evans, Soos. � and Hylebos Creeks — in order to determine existing and potential surface water problems � and to recommend action to mitigate and prevent these problems. These initial imestio tions used avai}able data and new Geld observations to examine geology, hydroloa, and habitat conditions in each basin. Fndin� from these three basins led the King County Council to adopt Resolution 6018 in April 1936, calling for reconnaissance to be completed on the remaining 26 basins. The Basin Reconnaissancc Pro�am, which was subsequently established, is now an irnportant element of surface w-ater management. The goals of the pro�ram are to pravide useful data �ith re�ard to 1) critica) problems needing immediate solutions, �) basin characteristics for use in the preparation of detailed basin mana�ement plans, and 3) capital costs as.sociated v�ith the earty resolution of drainage probtems. The reconnaissance raports are intended to pravide an evatuation of present drainage conditions in the County in order to transmit information to policymakers to aid them in developin; more detaiied rea latory measures and specific capital improvement plans. They are not intended to ascribe in anv conclusive manner the causes of draina;e or erosion problems; instead, they are to be used as initial survevs from which choices for subsequent detailed en�neering and other professional environmental analyses mav be made. Due to the limited amount of time available for the field work in each basin, the reports must be viewed as descriptive emironmental narratives rather than as final engineering conclusions. Recommendations contained in each report pmvide a description of potential rniti�ative measures for each particular basin; these measures might pravide maximum environmental protection throuoh capital project construction or development approval conditions_ The appropriate extent of such measures w-itl be decided on a case-bv-case basis by Countv officials responsible for reviewin� applications for permit approvais and for choosin� among - competin� projects for pub(ic construction. Nothing in the reports is intended to substitute P:SCB 1 • Soos Creek Basin (continued) _,� for a more thorouoh environmental and en�neering analysis possible on a site-specific basis for any proposal. III. FIl�IDINGS IN SOQS CREEK BASII1 Reconnaissance in the Soos Creek Basin v�as condvcted in November 1935 by Ray Heller, resource planner Randall Parsons, en�neer, and Don Spencer and John Bethel, consz,lting soil scientists. Their findin� and remmmendations are presented as follow-s. A Overview of Soos CreeY B�asin Geographic and land use features. The Soos Creek Basin is located north and east of the Green River in the eastern portion of the Soos Creek Plateau Community Planninb Area. The basin is situated east of the city of Kent, northeast of Auburn, and southeast of Renton The city of Seattle's Lake Youn� watershed is included in the Soos Creek Basin. The sonth and east portions of the basin are rurai in character, with the north and west portions committed to a suburban development pattern that includes subdivisions and scattered sinDle-family homes. The 1935 Kin� Countv Comprehensive Pian shaw�s areas east of Bip Soos Creek (in the northern part of the basin) and south of Lake Youn� with "rural development" desi�ations that specify 1-S dv�•elling units (DU) per acre. The southem area to the east of Soos Creek and north of the Green River is '; desi�ated "transitional." This interim desi�ation will limit devefopment to rural- ' residentiai densities until such time as rural/urban desi�ations are made throuoh updated community plans. The Kin� County Parks Department aw-ns more chan a frve-mile stretch from Soucheast 192nd Street to Lake Meridian, along Bia Soos Creek. These presently undeveloped park lands are mostly wedands and lie within the 100-year floodplain. Major gcolop� hydranliS and hydrologic features The Soos Creek drainaa area is a tributary basin to the Green River basin. The area is part of the Puget Sound lov�lands and is characterized by a glacial drift piain, covered by small ridges and rounded hills that were formed by continental'glaciation. While the Soos Creek Basin is moderately developed, the degree and amount of channel erosion, siope failures, and ot6er forms of geolo�c and hydraulic dama;e are far tess than mi�ht be ea-pected. Artificial convevances are also still functioning in this basin as they were oriD nally desi�ed and intended_ These conditions may be e�plained by three main factors. Frst� there is a verv effective natural retention and detention (R/D) svstem provided by an eztensive netvwork of 52 wetlands and numerous major and minor streams. Most of the wetlands are located in the northern portion of the basin in the upland areas as well as adjacent to stream� Bi� Soos Cree& ori�nates in the northeast corner of the plateau and flows southeast to the junction of little Soos and Jenkins Creeks. then curves west at its confluence with Cavin�ton Creek Bi� Soos Cr�ek joins the Green River east of Auburn near State Road (SR) 13 at 160th Avenue SE. These wettands and streams � : appear to be functioning wetl as stormw-ater control facilities for the rurrent tevels of de.�elopment. as weil as ser4ing to prevent damage fmm surface water runoff. P:SCB ? Soos Creek Basin �. (continued) � t Second, the soils in the upland areas generally have a high infiltrative capacity, particutarlv in the southern portion of the basin. Srormwater is absorbed into the I �ound at these locations before it can cause erosion or other damage. , Third, development in the basin has onty just be;un. Properly functioning wetlands and streams have not yet been altered, nor have weil-draining soils been covered by impervious surfaces to any �eat extent_ Maintaining these pmperly functioning drainage systems should be a goal in this basin and will be the focus of recommendations made later in the report_ I Habitat c�aracterisiics. 1'he habitat of Soos Creek Basin is generally good and supports Ja oe populations of both native and hatchery anadromous fish. The sourre of the hatchery flsh is a State facility near the mouth of Soas Creek. Cutthroat trout reside in stream w-aters, and anadromous C�sh spawn and travel in many of the tnbutaries and the main stem of Big Soos,-according to field observations and repons from local residents at the time of reconnaissance. Habitat is being damaged or threatened in some places by bank erosion and de�aded w-ater quality associated with land clearing, livestock feces, and wetland 611ing for development. One of the more serious instances of habitat-threatening erosion ori�nates at the parking lot of the Seattle Intemational Racewav (SIR), vwhich is located on the plateau in the lov�er portion of the basin. Draina�e from the paved parking lot is increasin� erosion in nearby tributaries and fiiling spaw-ning �avels with sediment. Appendix C of this report identifies sites of habitat damage or potential damage. Further w-ater quality , information reIated to habitat in the basin can be found in the Critical Stream Inventorv of Soos Creek. published by Metro. B_ Effecrs of Uifianization L.o.s leveis of devefopment in most parts of the Soos Creek Basin, together w-ith a weil-functioning naturat drainage system, have kept serious erosion, sedimentation, and habitat damao to a minimum until nrnr. Hawever, the present and projected rates of development indicate that there could be increasino amounts of damage, as suroested by the types of problems observed durina reconnaissance. The expansion of impervious surfaces in the basin is already be�nning to acceierate the rates and volumes of stormwater flaw-ing into (and reducina the capacities o� both natural and artificial chaane[s. Impervious surfaces are also reducing the amount of highly pervious . soils available to absorb runoff. The predictable impacts are already in evidence: erosion, mass-w-astin;, sedimentation, and de�-aded R-ater quality and other habitat destruction. The follawing section pravides a more detailed account of problems found during Celd imestigation. G Spet-ific Problems Ideniified 'The studv team examined numerous sites along the main stem of Bi� Soos, little Soos, and West Soos Creeks, as v�-e11 as 31 small drainages tribucary to these main stems. Several of the most si�ificant problems found during reconnaissance are � described belo.c. P_SCB 3 • Soos Creek Basin (continued) ,- -� 1_ Bank fai}ure�s On Tributary 007� nver mile 30, for example, there e�sts a major bank failure tri�ered by bank undercutting_ The source of the problem appears io be increased roaoff from street construction. Unless flow-s are intercepted and redirected to storm sewers or other facilities, there will be increased bank erosion and consequential deterioration of property and stream habitat. 2 Channel F�osioa This includes both instream and bank erosion caused by large volumes of runoff emeraing from storm drains and washing awav highly erodible soits. This creates a new, deeply incised channel that enla bes over tiroe. One example of this problem occurs on Tributary 0072 near the SIR in the lo�u�-er part of the basin. La pe e�cpanses of pavement at this location have contributed to high volume flov�s and channel erosion. 3. �7ooding and potential floodin� 1n numerous locations, development has -�' increased the amount of runoff entering eAsting drainage facilities or othervvise impeded the ability of natural systems to carry the amount of runoff. When drainage systems fai[ to function as they were intended, flooding can ocrur. Increased development w-ithout concunent increases in d:ainage facilities adds to the possibility that serious flooding will occur. On Tributary 009?. river mile 1.?0, for ezample (collection point 11), the Little Soos has been contained and manicured as it passes through a developed plat. Such alteration to a natura! drainage channel reduces the stream's capacity in places. The result has been the rea lar semi-annual flooding of some homes. Further development could ' � a�avate these kinds of flooding problems. 4. Poor stream habitat due to: � Lack of ovcrhead canopy and stream.side vegetation. Overhead canopy stabilizes w-ater temperature, while streamside vegetation protects banks from erosion. " b_ Contamination by livcstodc feoe.s. In areas of the basin v►�here livestock have eztensive ac�css to streams, w-ater quality has become de�aded by anirnal feces. These cause harmful nutrients to be added to the water which can , threaten Fish survival � Erosioa Streambank and channel erosion, already descnbed above, is caused in part by livestock access. On Tribntary OQ73, river miles 3.60-�.70, for example, there exists poor stream habitat because livestock have trampled and denaded banks of ve�etation; this has led to the sedimentation of spavr-nin� areas and pused turbiditv. IV. RECOARvIEMDATIONS FOR ACI'ION The follow-in� recornmendations are based on findin� of the field team and reflect the ori�nai �oals of the Basin Reconnaissance Pro�-am, as outlined in the introduction of this report. : --3 A Lnform appropriate gcn+�ernmental agencies of the detailed findin� from the Z,,;� reconnaissance of this basin. Project representatives should meet with staff frorn Kin� P:SCB � Soos Creek Basin -A--� (continued) 1 County Roads Division, Surface Water Management Division, Building and Land Development, and other interested agencies to transmit relevant information. B. Reevaluate speri5c policy issues regarding surface vrater management These may include the need to: 1_ Improve enforcement of wetiands regulatioas to maintain these areas in t6eir natural states, This will insure their continued function as surface water quality and quantity controllers, as we11 as preserve their habitat valve. If rep lation pmves ineffective, the County shouid serure easements or consider other means to preserve wetland areas� 2 Require the esiabtishmeat of undistur�ed buffers and setbac]�s adjacent to natural drainage swales. Variations in stream morphology and geolog}+ indicate the need for stream comdor guidelines that take these into consideration. Improve enforcement of "no cfearing" cavenants in these sensitive areas or seek Countv easements or actual o�-nership. Fencing alon� streams in livestock areas v►�ould help water quality and reduce erosion and sedimentation. 3. Imesiigate and promote the inCiltration of surface water where feasible and economical to reduce increased runoff from developed areas. Also, encoura�e the use of �ass sv�ales and open ditch convevance systems to imprave infiltration and � water quality enhancement capacity. Areas of high filtration are identified on _ final disptay maps (for the Basin Reconnaissance Pra�-am) in the offices of Surface Water Management, Building and Land Development, and Basin Plannino. 4. Require the tightlining of storm�rainage wtfalLs down steep or sensitive slopes using state-of-the-art facilities, including high density polyethylene pipe with enerw dissipation at the outfall. I S. Reevatuate stormwater rate and wtume retea.0 rcgulatioas for new developments. ' Current regulations may be inadequate and result in unacceptable dow-nstream erosion that causes property damage and loss of habitat. 6. Inciease current mainteaanec levels for King County sarface water R/D and mavcyance facilities. Due to the lack of funding, maintenance of eAstin, facilities is sometimes insufficient and resutts in facility dysfunction and failure. These will onlv be a�avated by additional upstream development. P:SCB 5 ' Soos Creek Basin (continued) , E C_ Prepare a comprehensivc basin pian to consider, at a minimum, ihe need to: 1_ Fnhance and utilizc the extensive e�osiing wetlands as regional siorm�etention farilities without jeopardizing habitat vatues. Prepare a xhedule for the anticipated need for these hydrolo�c enhancements as they relate to projected development in the basin and impact the wetland ecology. 2 Esamine e�asting storm�etention and conveyance facilities ro determine v�hether their control orifices are properly sized to optimize the detention site and achieve the marimum benefit to the downstream systems. 3. Fstablis6 Doodplains in low-lying areas of siight gradient for existing and developed runoff conditions, i.e�, adjacent to wettands, particularly for v�-etlands proposed as m�onal detention sites where inundation of adjacent properties raay be si�ificant. 4. Identify siream reaches critical to the maintenancc of anadromous and tiout P�Pulations. S. Review geologic findings from this study in order to identify areas of partirular soils' sensitivity and develop special analysis criteria for nevw developments. D. Coustrud the rapital imprvvement projerts a000rding to thc (.� priority selection j criteria. These PI'olecLs, identified in Append"nc B of this report, iaclude projects ta 1 CaLbrate and ret�rofit exisring detention-control str�ctures and to improve existing convevance svstems. 2 Stabilize cfiannels and slopes. 3. Provide iegional deteation faalities, includina the utilization of v�etlands, where bioloa cal assessment has determined that the natural habitat values will not be signiGcantly altered. E. Maintain or cnhaacc We insiream and iipatian habitats. 1_ Maiotain wctlands and buffer a�cas aroand them These pmvide both valuable wildlife habitat and natural stormwater storage that helps to maintain year-round baseflov�s in the stream. 2 Adopt a �m-oorridor policy in the Soos Creek Community Plan to protect the stream corridor from dama�ng types of tand uses in adjacent areas. 3_ Encourage the Washington State Department of Fisheries to allaw use of t6e natura! strcam system f�r salmon spavvning. Maintain a natural run of atl the indi�enous anadromous species. 4. Prohi-bit filling in the 100-year IIoodpiain. The Countv should establish rewlations to prevent the loss of floodplains in order to maintain their natural � � stora_e for floodwaters and p ard a;ainst de�-adation o[ important fish and wildGfe habitat. P:SCB 6 • : ,i!;I �'� NJ � �, .�, �1� � �` �+ r 1 ��' � 1' f � ,, .. ;r ..... I .. , �11�U,1 :, i xF._.. 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Lstimalc� Cosls Numhcr Poinl 1'r�jccl U�;scriplion Problcm Acldres�cd and Commcnts Sqpl' 20 <;onstruc� low bcrm (npprox. ?') un� hlitig�tcs increased upstrcam p�ak S153,000 proportional �ixhurgc-control wcir [lows an� runoff volumcs. (likcly �o be much �►t outic� lo wcllan�. (This projcct Icss due to land iti i��lupcnJcntly jusli[inblc.) Wetl�in� acquisition cost) raling is #2. L3iologic�l nsscssmcn� is ncc�cJ to i�ssurc lhis projcct docs not �ccruatic htiliilut v.�lucs. 54O2' 9 Lxc�rv,i�c nn� hcrm to construct rcgion�l Milig�tcs incrc�scd upstrcum pcs�k $194,000 fnciliry at lowc;r cnd o[ wcUand. flows nnd runofL This location sc�ves (Jc�cndcnt on land 1'rovidu proportionnl wcir dix;hnrg�. 'I'ril�. Q073 nnd 007b. (Good location.) costs) Wctl�i�d rnling ia #]. I3iologicnl .��.u;�.smcnt is nccdcd to n�.surc this projcct docs not �ccrcAso h��bitflt v�lucs. 5-1U3` C;ouIJ not loc�itc or v�ri[y, A��ress in b:isin plun. (Climinat� for now.) 540�" 17 Cc�ns�ruc� n proportionz�l control wcir Mi�ig�lcs incrc�scd upstrcnm pcak [lows $250,000 Wcllanas 4a 16 ,�l SL; 334th St. hriJgc. (I'rojcct shoulJ an� cun�ff. (I��irst sitc that coul� bu juslific� hy a futuru bFisin a��lrc�s flows south of Nctrovitsky.) . hlun.) WcUun� rating is #2. I3i�logical �i�.tic�.timunt is nccJcJ to n�.surc this rrojcct aa;s not Jccrunsu huhit��t valucs. i�:scu.nrn n-i �l�<< <�� _.. Cstimated Costs , �umhcr Pc�int 1'r�i�cl Uuu:rinlion Prohlcm A�di�cs5�� <in� Commcnts 5405• 19 Construct hc�m nn� proportionul control Mitigates increased uPstream pcak $98,OQ0 wcir in I3oulcvt�nJ l,�nc P�trk. (Projcct flows t�nd n�noff. shoulJ I�u justificd by a Ut�sin plan.) WcUunds rnling is #1 l3iolo�icul �i�tic�.timcn� is ncu�lc� lo , ti�.�urv Ihis projucl Jocs not �ccro��sc ' hahilal valucs. • S�iO(�" 12 (:ans�rucl aullut-c,onlrol slruc uru it' a cs i c�s u I t M ig I ncr � cd pstrcam pcak $17,300 , WcllanJ 5.1��1 al cxisling culvcrt p.issing flow [lows �nd n�noff. May provide � unJ�r SL 25�i1h St, (1'rojuc� woulJ extra dctcn�ion to �s.sist in ' bu inJcp�n�vnlly juslifitibl�.) Wcll��nd nllcvinting cnpi►cily problcros far r;�ting is #2. f3iolagicnl ��.ticssmunt is downstres�nt. nucdcJ to nstiurc this projcct clocs not �cercasu huhil��t vuluc4. S4O7 IS Ccros�nu;t t� hcnn iin� pr�porlion�l Mitig�tcs incrc�scd upst�c�m pc��k S?28,000 I� Wc11anJ Sa2p Jischarg� wcir nt oullct of uxis�ing flows �n� tlmoff. wutlsincJ. (Pmjcct shouW hc jusii- fic� hy Fi husin plan.) Wcil��ncl ra�ing is #2. Liiological �i�.ticttimcnt iti nccdcd to n�.tiurc lhis projc�l Jocs not J�crctiu: h�hilul viilucs. S�O�t' 13 R;iitic thc Sli ?4Qth Sl. raaiclwtiy Miligates incru�sed upstre�m pcuk $70,000 urproxinrUcly 2' u�J conslruct a ncw flows and ninoff. (Gooci loca�ion.) hri�gu witl� proportioni�l conlrol wcir. (Pr�jccl shauW hc juslificJ by i� basin �lun,) WcUunJ rt►ling is #2. L3iological t��.x:�.Smcnt is nccJucl to a�.,uru lhiti projccl Ja:s n�t accrcc�sc h.�l�ilul valuuti. • i�.�r.u.ni�n �.� ��- �. / ,� �� I'rojcct Cc>Ilcct. G�timatcci Costs Numh�r Pc�int I'r<�luct Uo�;ription i'rohlcm Aciclrc�,scd and (;omments SaO')' 13 C;onstruct berm �n� proportion�l control Mitigntes incrc�sed upstrcam pcak 5221,000 W�tlancl S�J33 wcir at outivl to (:lark I.�ikc. (Projcct [lows tind runo[f volumcs. Muy (dcpcnding on land c�ul� hu in�upcnctenlly juslificci.) proviJc catr� dctcntion to allcviatc costs) � Wctlu�J rnting is #1. 13iolo�ic;i�l cs�pacity problvm �iownstres�m. ��.tiu�.smcnt is ncc�cd to nssurc this pro- , jcct �locs not dccrc.isv ht�bitat valucs. 541U' 8 Constnict ccntral mnnholc at ouUct 1'rovidcs continucd detcntion for $28,000 WcUan� S4H8 �f c�;isling pond. Uc�d storpgc should mobilc homc park plus smull nmount bc muinluincd for ncsthcllcs. (Pr�jcct of ��JJitional nrc�. scums of vcry limitcd vnluc.) Wcll�nd � rating is #2. 5411` 1� Sm��ll wellan� locatcef ne�r top of No projeet proposed. M�int�in (Climinnte for now.) WuUancl 547C, suhh;�tiin; msiintuin conJilion ns is, wcllt�nd in its cxisting statc. Wctls►nJ r.�ting is #2. l3i�logici�l ��.u;�.smunt is ncc�icd to �ssurc this projct clocs not cJccrcUsa hnbilUt vF�lues. 5413° 1G (;onstruct Ucrm nnJ �roportion��l control Milig�tcs incrcascd upstrcam pcak flows $246,500 Wuil<inJ SqyQ wcir tit ouUct lo well�n�. (I'raject and runofG (dependent on land shoul� b� justificd I�y future biisin costs) plan,) Wctlun� r�ting is #2. I3iologicnt r��.scksmcnt is nccdcd lo �ssurc �his nrojcct docs not Jccrc:►sc h��hilat vnlucs. Sa 13' 3 ('onstruct l�crm nnd pr�portiont�l control Miligatcs incrc�scd upstccam peak 5193,600 WcU;in�i Sq77 wcir at �ullct lo wetlnnd �dji�ccnl t� flows �ncl runoff. (Mi�y not be ��s (cicpen�cn� on lancl SR I�t, (1'r�jcct shouW bc jutitific�l hy acsir�ihlu .is Projccts 5419 �nd 542Q.) costs) futurc h��sin plt�n.) Wctlnncl rtiling . is #?. L3iologic:i�) a�.ticsSmcnt is nc�Jcd lo ti�.tiur� thiti projcct �fa;s not �lccru�ise hahilal v�Uu�x. I':ti(:13.n1'A A-:� _— - ,cct (:oUcct. C.titim.�tcci C.,� , nh�r Poinl Projccl Ucx:riplion � Prohlcm �1�dres.scd �na C;ommcn�s 5�I�J 3 Constnict h�rm un�i cxcnv�itv �o Mi�ig,itc incrcascJ upstrenm pcak flows 51�>9,Q�0 rrovide nd�lition�l deten�ion v�lume. �nd runofF. Rcconstn,ct dischnrge from (:onstruct n conlrol mt�nholc, (Projcct SL, :i?Qlh St. lo stablc outict. (Justifi.ihle is in�c�x;n�cntly justifizihle.) immc�iutcty duc to imp�cts on statc fish I h.�Ichciy.) I S�I15 1 (;onslcucl libhUinc systcm in Prcvcnts furthcr roud cmbankmenl and stccp S15G,000 czi��ing slrcum chrinncl. (Nrojccl cut•h�nk f��ilures. (Justificd immcdiatcly is in�upcnJcntly juslifahlu.) �u� lo impacts on statc fish halchcry.) 5-11�i II Cc�nstruc:t ncw IanJu;�pcd hcrms �cljacent Prevenl neighhorhood flooding, which to uxititing privutcly ownc� iin� muin- juopurcJiccs 3-4 home;s by con�aining strcam Iainc� strcum chunncl to incrcasc ,�s it p�►sscs� through plat. (Juslifiablu c�irucity ;in� pr�vcnt ncighhochood immceli�►tely as situalion will only worsen flooJinb. (1'rojvcl is indu��nJuntly wi�h upstr�am Jcvclopmcnl.) i juslifuhlv.) 5.�17 I:� Itaik. I4Rth �1vc. SG ro�iclwuy ,ipprox. Llimin�tc sc�son�l flooding of roadway 5223,000 I.S' i�nJ conslruct proporlion:il conlrol and mitig<�le incrc�scd upstruam Pcak wcir ul Sl: 2S(>Ih hri�gc. (I'rc�jcct iti flows und n,noff. (Justifiublc imntcdialcly inJcpcnacnUy justif��hlc.) ciuc lo floocling of ro��way.) 541`� I�t ('onsiruct ccmtrol wcir ttt hricJbu on Mitigulu incrc�scJ upstrcnm pc�k flows 388,700 SLi I.��kc Youngs Wuy. (I'rojcc� should ancl ninoff. hc juslific� hy futurc bi�sin plun. S�19 IQ (:onstruct pro�rtionul wuii• ut uxisting Miti�atc incrcascJ upstrcam pcak flows $138,000 hri��;c. (1'rojuct shoulJ bc jus�ificJ ancl runoff volumcs. (Silc apput�rs morc (�cpenJcnt on land hy fu�uru husin plan.) �csirahlc than S�ll3 Juc �o uzisu of usc costs) �iccc�.ti.) S•a?0 I I l�ivurt cxcc�.ti fl�ws from I.it�lc Soos Miti�alu incrc��scJ urstrc��m pe��k flows $68,50Q into uh;inJonuJ horri>w ri� far infil�ra- un�l runoff volumuti. ('I'his is a hi�;hly �i�>n. (Projcc� sh�ulJ hu juslil'iuJ hy Jusicahlu ullurn�itivu �uc lo grouncJwalcr fu�urc hasin plan.) rucharbu �n� qualily c�ntrol.) I':ti(:L3.nl'/� !�-4 (,�"�� 1 `�d�°' -- - - - - - -- ------ - - - -- - APPErrDix s CAPITAL IMPROVEh1ENT PROJEC'T RANKING SOOS CREEK BASIN Prior to the Soos Creek watershed feld reconnaissance, 13 projects had been identified and rated using the CIP selection criteria developed by the Surface Water Manaaement (SWM) Division and the Natural Resources and Parks Division. Follawing the reconnaissance, 20 projects remain proposed for this area. They include the 7 new, previously unidentified and unrated projects ptus the initial 13 projects. The previous SWM capital improvements project list for the Soos Creek Basin had an estimated cost of S3,450,000, while the revised list decreases to an estimated cost of 5�62?,000. This 24r'o reduction in estimated capital costs is due mainly to dawnw-ard revised cost fib res for acquiring or securing easements aver wetlands. The foilov�ing table summarizes the scores and costs for the CIPs proposed for the Hylebos Creek Basin. The projects ..were rated according to previously established SWM Pro�-am Citizen Advisory Committee criteria. The projeas ranked belaw are those for which the first rating question, ELEMENT 1: "GO/N0.G0," could be answered affirmatively. The projects can now be considered for mer�ng into the "live" CIP list. Any project scoring over 100 points should be considered for incorporation into the soc-year CIP plans. RANK PROJECT NO. SCORE COST 1 5415 135 S 156,000 2 5�317 1'Z7 ?23,000 3 5�307' - 113 �?3,000 � 4 5�14 105 169,000 5 5409' 100 �?1,000 6 S�t16 93 63,400 7 5402' 95 194.000 3 5�301` 59 153.000 9 5�306' 33 17.300 TOTAL 51.�330.000 ' Indicates project w-as identified by S�'VI�t prior to the reconnaisance. API'CNUCX C DLi'I'Al1.L;U I�INUINC;S ANU Itl:<;()MMLiNUA'I'IUNS SOOS CRGLK BnSIN ' All iloms lis�ed he►e are localed on linal diaplay maps fn Ihe ollices ol Surlace Waler Managemenl, building and Lend Dovvlopmonl, and Eiasln Planning. 'I'rii�. .l (:olluc�. L:xislinb Anticipalecf Ilcm Itivcr Milu Poinl Calc•oi Prop. 1'roj. (:on�ilions �nd Pmhlcros Conclitions nn� Prohlems Recommcnd�tions I UU7? l llydrology Sce item b. M�in st�m wiU Ue strained to New devclopmcnts in upland arca ItM 2.��4 �ccommoJi►tc incresiscd volume shoulJ invcsligalc infiltration of of runoff from �cveloping runoff �s mucl� as possible. Direct are�s upstrcnm. li�nk erosion disch�rgc to stre�m, pfter tigh�lini�g (causin� incre�sed siltation down sensitivc slopes, is un�lesirable �na haUitiit cicstruction) and "last choicc" altcrn�tivc. slopc failures (Icnding to property d�mngc) will result. 2 OU72 1,3,10, I luhit�it l iubitnt of upper strcam Morc filling of wctl�nds. Prohibit (illing within 100-yr, 1tM .�,O 13,17, gooJ from buffcr of extcn- Scdimcnt from AdjAcent devel- floodpl�in or in weUands. Work with 1�'i,l'I, sivc wctltinds nnd m�in�cn- opmcnt will fill portions of I�ndowners to [cnccg nlongsidc str�am 2�� Anctl by Gounty P<irks Dept. w�llands and slreum ch��nnel to keep [arm animals out. Problums on .562 ncres qf duc to low gridicnts. Morc wcUands includc illcg�l dcbris, pollulion, And flood- filling, livcslock-rc:lalcd ing wiU result from �d�iition� bunk �rosio�, �lcbris in dcvclopmcnL � sU�cttm. 'I'hure is a grc�tcr �lcbrc� of �I�vclopni�nl . t►Jjticcnt lo sU�cam. M�iin stcm provi�cs import.�nt cuiiring hubitut for . �:ilmoniJ srccics. ��;tic:u.n��c: c:-i �r....... �3---- ,N;,. i��' �� ,v..I, �,,.;_. 'I'rih. .� C�Ilcc;t. l:xisting nnlicip��cd I��m Rivcr Milc I'oinl Calc rn f'rop. Proj. Con�iti�ns and i'rohlcros (;on�lilions �ncl Prohlems RecommcnJalions ;� 0O72 l C;uolo�ry ,Soos Cr�ck mc;�n�icrs on � Untit��bl� soils �na wct con- I�utuee construclion should r��civc RM .�i0 wi�� tilluvial plain. Ilum- �lilions on v,illcy slopcs. closc slu�y for stnbilily an�f ma:ks on v�►Ilcy w�lls and erosi�n polential. "pislol butt" trcc ti��nks su�csl coUuvi�il crccp. � Numcrous springs wiih silt/ clFiy lithology. � 4 (H)72 l 1(��hitat Dnm on muin slcm impounas Incrc��scd [lows will result Dcvclop basin plan wilh computcr 1tM .(�() fi51� for st�te fisl� in more floodi�g and polcntial simul�i�ion of strc��m flows to give (ttticltcry. .No problcros h��nk crosion. complctc an�lysis i� lower portion obscrvc�, of Soos Crcck. Also inclu�e Jcnkins �nd Covington Crccks. 5 (lO72 1 (icology Crosional cl�utc h' dccp llighligh!s scvere crosional Reccssional sand dcposits RM 1.70 cmcrgcs from runoff of po�cnti��l of tliis rcccssional in scctions 2, 3, ]0, 11, 14, 15, 16, Suulllc Intcrnalional Road- s��n� unit nnd impact of un- 21, and 22 of '1'21 N, R 5 C arc way (SIIt) p�rking Area. controlled runoff. highly sensitive to erosion. Reyuire Lithogrnpl� is loose, str�ti• liydroloic and geotechnical reveiw [icd reccssion�l s.�nds. for design, adequ�cy, and suitability l.nrgc sslidc induccJ north of collcction and convcyance facili• of rt�ilruocl rigl�t•o[-w�y. tics for ull runoff from S(R, as well as cxisting and planncd develop- ment within I�oundary of collcction area. Rcquirc implemcntation and complianc� if no (acilities exist. <, Oq7? 1 Gcol�bry Main stcm of Soos Crcck is Nonc. Nonc. IZM 2.Sp 25' wiJc will� wcll-dcvclopcd grnvcl Uars. '1'crr�iccs suggcst occasion��l flows 2" ��hov� currcnt Icvcl. I':SCl3.nl'(' C.� :� ...J 'I'rih. ��C (:c>Ilcc:l. [:xititing nnlicip�lcd I�cm Rivcr Milc Point C'alc�oi Prop. Pt'oj. Contlilions ��nJ 1'rohlcros Con�iitions s�nd 1'rohlcros Rcc;ommcnclations �� >7� � ��gy Mflin stcm of Soos Crcck is Nonc, Nonc. ItM 2.5p 25' wi�Jc with wcll-�cvulopccl grnvcl bnrs. '1'crraccs � su�cst occt�sioanl flows 2' nhovc currcnl luvcl. I � I 7 UQ72 I C;uol�6ry I� vic:inity of priv;itc foot Conlinucd mcdium to I�rgc None. I RM 2.(�O hridgc, mc�fium to I�rgc failures into crcck. � hunk f.�ilurus occur in silt/ , clay-rich colluvium. Cnusnlivc mcchunisms include undurculting rnd reJuced shc��r strcngth owing to nhun�nnt springs and seeptige �I, �S Op7? 1 Ilabitat Privatc I�nJowncr h�s [�ill and riprnp will shift Restrict filling and riprap in 1ZM 2.hp pliiccd ripnip foc 15Q' on stre�m onto opposite bank, n�tur�il me�nder of floodplain, if Ieft liank. resulting in inere�sed bank pro�erty in danger, consi�ler pro- erosion. tective measures along streamb�nk such as riprap. `) (l(172 I C;cology+ 3Q" dinmctcr CMP with Continucd m�intcnAnce. Nonc. RM ?b5 cra5ion in rccuasionul snnd�. l0 ()Q7? 3 IlycJrology 5413 Sc;a Item fi. Main stre�m will be increas- New developments in upland area ItM 2.�44- inbly slrain�J to hnndle should investigt�te infillution of 5.35 liibher.•.volumc of ninoff from runolf ns much as possiblc. Dircct- dcvclo}�ing nrcns. L3�nk ing dischnrge to strenm after crosion �nticip�tcd, c�using tighllining down scnsitivc slopcs huhit�t �lcgrid�lion, slopc is undesiral�lc "last choic:c° ��Itcr- failures, nnd property d.un�ge. nativc. I':S('13.nI'C C.3 F�"` :► �►„v� ,i 'I'rih. �� (:�Ilcct. Cxisting nnticip��tc� l�cm Itivur Milc Pc�int Gilc�o I'rop. I'roj. C�nJilions �m� 1'rohlcros Con�iti�ns �ind 1'rohlans Rccommcn�alions � � ��172 3 Cicology WCsI of ConfluCnCe of Crcck block�ge and lhreat lo Recessional sand deposits in scctions ItM 4.2(1 .I�nkins anJ Soos Crccks, Property nc�r edge of b�nk. 2, 3, l0, I1, 14, 15, !b, 21, an� 22 2�0' of sloughinb in of T 21 N, R 5 C ��rc highly scnsitivc rccc��ional k►nas und �o rrosion. IJc;n�ify �iiu;hargc grtrvcls in 40'•high l��nk. sourccs an�f cvuluate a�icqu�cy anJ Causu tippcu�:ti lo hc ovcrUank sui�abili�y of collcclion an�i convuy- ' dik;hurgu. �nce f�cililics. Rcquirc compliance if nonc cxisls. �2 (>O72 3 Il�ibilat Slrcant hahitat ap�cars to Nonc. None, IZM 4.2U b� in gooa conclilion on tl�is stucp�r portion of thc strcam. Rifflcs common, with somc pools. Strc�m- sidc vcgct�tion �nd ovcr- hc�d cnnopy both abund�nt. 13 OO7? 3 Gcology Ncnr bridge, streF�m flows Tncre�sed futurc flows could Development detention for RM .S.HQ through waoJcd wctland. ovcrtop cxisting berm stn�c- tributaries upstream. tures �n� flood �dj�cent agricultural lan�s. 14 (1Q72 IU Iiy�lroloby 5419 Sligltl Jcgrce of develop• AreA pltinncd to develop only A basin pl�n shoulcl examine ItM 5,$5 munt ht�s not cuuscJ sig- mo��r��tcly; significnnt prob• feasibility of �iructing flows from nilicanl probl�ms. South Icros will probably resull 1'rib, 0092 ut collection point I1 portion o[ WcUunJ G430 fcom u�strc�m arcas tribu- into proposcd R/D site at gravcl ��nJ un�csign�tc�l wctl�nd tary to this point rathcr pit e��st of 1S6th E'I. SC. This nt this colloctian point lh��n from flows gcncratc� coulci provide infiltration, deten- �rovi�i�t R/U for loc�l �n�i I�y n�noff. tion, �nd ovcrflow discharge �iircctly upstrct�m trihulsiry flows, lo collcction point ]0. Somu loc<iliic�i hank ovur- topping in rorli�ns of m�iin rc��ch, hul innundation . (►rohuhly limitc�l to ��Jj<ic- cnt tigricul�uriil I�incJ. I':S(:L3.nt'(: (:-4 � � i , 'I'rih ('olicct. Cxisling � nn�icip�lca � I Ilcm Riwr �%lilu Pc�int C�ilc��i 1'i'c)P. I'rol. Con�itions z�n� I'rohlcros ('oncli�i�ns iin�i Prohlcros RccommcnJalions � IS (x)72 13 (;calogy At 2Sbt1� crossing, wcll�nds C?verflow be�ween SL 143th ��ncJ Pcrform cost-benefit an<�lysis for I �ZM �,'-p nnJ slow flow ch�ir�ctcrizc SL. 25G1h. gracic raisc ancl improvc� �rainasc. sails. I<r OO72 13 Ucolo�ry Al 244th (24011�) ovcrland Non�. Nonc. ItM 7.�)5• • out-of-hiink [low is comm�n; n��s. 17 (H172 l3 IlyJroloby 5417 Wcllan�s provicic R/U for l�loo�in� of ronJw�ys will Incre�se hcight of roaJway embank- M�iin slcm 540fi nrcns upstrcam nncl tribu- becomc morc common �nd mcnts to prcvcnt conlinucd floo�ing. ItM 7•2O-7•4 Isiry lo rench. J48th Ave. grcater in extont as upl�nd Monitor weUands for illegal filling RM 7.�)S SL roi�dw�y crossing wctlnnds aru�s dcvclop. pnd gr�ding. in tiren is ovcrloppcd during high flows duc to a slight cicv�tion of ro�dw�y. Some locnli�cd bnnk ovcrtop�ing in nonwctlnnJ portions of muin rcach, hut innund�tion limitcd lo i�dj�►ccnt �gri- cuUurn) It�n�1. l8 OU72 17 Gcology Minor flooding in wctland lncreascd [loaiing activity Dcvclop dctcntion for upstream areas. 1tM ').4S nreas wi�h degracl�tion of is like:ly witli upstream porlions of SC 2?411i. devclopmcnt. I�) UU72 17 Ilydrology 54U4 No signific�nt problems in No upl�nd problems �ntici- Monitor arc�is �djacent to wetland RM ').55 uplan� Jue to low Ievcl p<�ted �s �rea is pl�nned to for illegal filling and �uke �nforce- dcvclopmcnt. SL 224th St. Jcvclop very littic more. ment i�ction �s nceded (or restor- rond emUnnkment is only Any devel�pments in nreas �►tion. iipprox. 2' ahove wc:tlnnJ; trihutiiry to �his sul,b�sin mny bc ovcrtoppcd. I'criodic will cx�ecrh��tc flooJing of ovcrtopping nna innund��lion SL; ??4tli Sl. of h�sc, dctcrior�ting road- way whcrc '!'rih. Q095 pa�.tics unJcr SL' ?Z�th. I':S(:13.nPC C-S �.,,,�, . ... 1 � '1'rih. ��c Collucl, L.xititing Anlici��tcct ' Ilcm Rivcr Milc I'oint Calc oi I'ron. 1'roj. ConJi�ions ��nd I'rohicros Con�ilions �n� Prohlcros Recommcncl��tions 2Q Op72 Ift (icology Soos hcndw�tcrs flow siowly Nonc. Nonc. ItM 10.5U through sniooth p�isturcl�nd. 21 (1()73 l�t Ily�rology 541� Wcllimd 5409 providcs R/D Continucd dcvclpmcnt may Monitor arc�s �djaccnt to wetland �ZM �� for �re�s tributnry to cause some loc�ilized c��p<icity for illegal filling and take enforce• ' rc�ch. Somc locnlixcd h�nk prohlcros in upinnd �rihut�ry mcnt �ction �s ncccJcd for restora- ovcrlopping in m�in rciich �rc�s. Ploociing south o[ tion. south of ?04th Wny, Uut SL ?Q4lh Way likcly to bccomc floaling currcnlly limited more scvcrc unlil upstre�m to adj�ccnt ngricultur�l rcgionnl �ctcntion sitcs la�nd. dcvclopmcnt. 23 Qq72 1') 11yJrolobry 5405 Wetland 54Q2 provid�s WctlanJs will continue to be L.egal �ctions pending against illegul RM 12.?0 nt�lurnl R/U to downstrcam thre�tened by illcgal filling filling; seek to restore weU�nd to syst�m, ulthoubh its func- timtil e[fective enforcement origin�l state. Yossible opportunity llons hme been scvercly m�thocis �r� developeJ. to crei�tc multi-use f�cilily in dcgr�dud hy illeg�l filling C.�p��city prablcros shouW be exis�ing King County 13oulevarJ l.�kc soullt of nnd �aj�ccnt to aciJresscd by downslre�m anal• I'ark if nccd idcntified in future Pclrovilsky ltd. �n� cnst ysis for ncw dcvclopments. b�sin pl��n. of SL 1�2nd St. Some County sl�ould coordinnte c�p�city problcros exist convcyancc improvcmcnls. nt undcrcrossing of I'ctro- I vitsky Rd. P:SC'L3.nl'C C-G { � � j.... .,... ��i 'I'rih. �� Collcct. Lxislinb AnticipatuJ llcm Itivcr Mi�u I'c�in� Calc��i Prnp, I'rol. C�nJitions anJ 1'rohlcros C:on�iti�ns �n�i Prohlems ItecommcncJ.�ti�ns I� 2:i Qq72 2U Ity�rolobry 54�1 I�t�clors expltiining I�ck of Recent installc�l s.�nilnry Protcct and cnhancc wc�lan�, A � RM 14.25 problums in this �ren: sewcrs make it likely that high-density mul�i-f��mily clevelopmcnt ', 1) this uppermost sub�rea �r�� will fippro�ch its m�y be pr�posed �djaccnt io wctl��nc1 h�►s no olhcr trihu��iiy ��nlicip��IcJ d�nsity soon. duc to incrcasing devclopmcnt �res• t�rc.�s; 2) Jevelopmenl is Wetliinci will conlinu� lo sures in arca. ' mcxtcr<�lc �nd m�ny homcs �rc providc ��Icquatc buf[cr for silunlcd on I�rgc scvcral- downsU•c�m systcm, providcd ncr� p�rccls; 3) nn cxtcn• it is not dcgr�idcJ by illcgal sivC wcll�nJ (#SAOI) ncts filling or cicaring. Ch�nncl ns cffcctivc niitur�l 1t/D upsU•cam of wctlt�nd is likcly site, as eviduncc� nt to experien�c somc c�pacity collcction�point. �roblcros; thcse shouW hc �cldresscd Uy ncw dcvclopmcnts ns thcy occur, possibly with County coordinnting a coopera- tivc funding of convcy�ncc improvcments. 2�1 OQ72n 1 I i:ibit:►t There Are sevcrAl severc More dcvelopment �t collcc- - Repair erosion of R/D pond at RM ?.dQ b�nk Cuts, ns well �s debris tion point 2 and �t Green upper end of tribulary. in strct�m. liaUit�t for Rivcr Community Collcge will - Remove eiebris from strcam. [ish is poor. incre�se flows. Increflsed flows�will result in more bank crosion, scJimcnt, nnd lo�.s o[ h;ibit.�t. 2.5 OQ73n 1 Gcola�y Urain pipc un�crcuts to Ilighlights potenli�l for �v�luatc source and establish RM ,2S form erosionnl chute. continued or incret�scd allcrn�ite mc�ins of conveyance. N.iturnl springs hovc down- crosion in loosc coUuvium cut H" inlo soils 1':S<'13.n1'(: �;.7 . ,, • ', ��.,,� 'I'rih. �l Collcc�. L:xis�ing nnlicipaica Ilcm Rivcr Milu I'c�int ('alu�oi f'ro�. I'roj. Con�ili�ns �ind 1'rohl�ms Con�filions ana Prohlems Rccomm�n�ia�ions ?(� O(172n I Ci�olo�,ry l3ank fnilures of �iclt�ic Incrensccl erosion of b�nks Intercept source flows in strcet ItM .30 Juposils (iincicnt Inkc) nnJ �ctcrioration o[ h��hitat. �rc��s ,�nd dircct to storm scwers ��'�SScrcd by uncicrcuUing; or suilahlc facili�ics. responsc to inrrc�is�� [lows , from strcets nUovc. 37 UO73n 2 (ly�frolo�,ry 5414 Uctcnlion facility for [f not corrcctcd, problcm Construct cicic�tion facility hcre RM 3.IU Rninicr Ri�1gc singlc-fAmily wiU cfccply incisc swvalc bank ancl aircct n�nof[ from SC 312th plul uppc�ircd lo bc nn�i transport �n uniuccpt��blc St. to this locution. Annlysis �n� functlo�ing, i�llhough onc volumc o[ mnlcrinl to strcam dcsign o[ f�cili�y shoul� c�libratc scclion of uerm h.�d crodcd bolow. Incrcnsc� runof[ from e�;isting dctcntion facilitics and s�vcrcly iind nccJs rcpair ncc� soon lo bc dcvclopecl construct rctrofitting control �nd zirmor. Pipe dir�cting will �gsr�vatc slopc failures fcntures to �Ilow all facililics in ro�dslde runoff from obseived. Rcach is of par• the subUasin to work as a compl�te north sidc of SL 3?Oth h�s liculnr concern duc to s�clversc system. f�ilcd, nn� nmoff hns imp�cts on slnte fish h�lchcry cut ditch through vcge- immc�ii�tety downstre�m. tnlion lo cnst, cuusing significnnl slopc f�ilure on righl Uank of tribuli»y. 2��i O(172L3 l Iluhitut Culvcrt unJcr ri�ilro�d is Incrc��sca strcnm downculting Placc strict onsite controls on any 1tM .IU n fish l�lock�ge. Sm�ll nn�i resulting l�nnk erosion, future dcvclopment tributary to this cphcmcral slrc,im undcrgoing sidccutting, �nd scdimcnta- dr�inage, sincc no nrca cxists for somc bi�nk crosion due to tion downslrcnm will occur. rcgional R/U. incrcnscd pc:ik flows. 2') (1O73U ] C;cology Sill/cluy lithology cxposcd Nonc. Nonc. ItM .7S in Utink. 1':S(:l3.nl'(: (;-8 'I'rih. �l (:allccl, Lxisling M�icipulc�i lwm Itivcr Milu I'c�int CFi�u�c)ry I'ro�. 1'roi. C�n�ilionti �in� Problcros ConJilions an�1 ('rohl�ms Rccommcn�alions :i0 (x►72(� I llahital Sntnll, clu�.S S s�rc�m; poor Lrosion Af1lI (JOWf15lfC1111 Lstablish nonerasive sto�mwater ItM .IO fish huhilut �1uu lo smull scJim�ntulion incvit�bl� if relc�sc rutcs �n� volumcs for sizc. Slroam�ictc vcfic�ntion Jcv�lopment occurs. fuluru acvclopmcnt. F�n� ovurhuuJ c�inopy in g�oJ conJition. 31 (1O731) I Il�ihi�,it Scvurc crosion, hnnk fail- 'I'hcrc will bc morc movcment Lstablish onsi�c control for S[R ItM .IQ ur�s, sliJus, nna scJimcnt of largc a�mounts of c��rth, stormwutcr. cxist. 7'hcrc t�rc iron[ixing hn�lCrin front achris. Out- full from SIR parking lot flowt into this trihulary, 33 OU73 I Ilt�hitat Ili�l�itnl in gaod condilion. MudJy wotcrs on r�iny day show - Rctain n�tural stroam corridor. RM .;�0-.90 Nica pools an� rifflcs. crosional proUlcros upstrc.�m - Cnforce crosion conU•ol rcquirc- somc dcbris ��ims hut no [rom collvction point S. mcnts foc new �cvclopment. [ish blockagcs. Strcunt is � fairly high, muddy nnd sil�y. Overhes�a Irees AUundant, ns is strc�msidc vegctntion. :�3 (>p7;i 1 Guolo�,y 100- to 30Q-yr.-oW �cbris Unst.�blc [or constn►ction. Monitor during permit rcvicw pra;css. ItM .35 flow with ncognizal�l� f.�n Itisky. morpholobry �mcrg�s from nturow dr��w. M�y h�vc Uccn triggcr�:d by logging Ucforc lurn o[ c�nlury. :�a OO73 I (,colo�ry Sill �xpos�cl in slopc (:ontimicd h<�nk reces.sion, Evaluate total system flows �n�, RM 12M .9Q fuilurc in�ucca hy Jcgruaing of spuwning cncironmcnt. i[ pnident, duvclop altrrnativcs un�cTculling. to instrcnm �iisc;hF�rg� of runoff from dcvclopmcnls. I':ti(:U.nl'<: C:-�� . f;� '�. .. ,� <�4{' i �� , � �..... 'I'i7h. .l Colluc:l. Lxisting Mticip.►tc� � licm Iilvcr Milu I'oinl (',ilu ot I'ron. I'roj. ('onclilions �in� Prohl�ms ConJilions �incl f'rohl�ms RccommcnJations 35 (H)71 I (icology Silt CxpO5c�) In (;onlinued h,ink rece.ssion, L;valuate total system flows ane1, II RM .')5 slopc failw•c in�uccJ hy dcgr��d��tion of spawning if prudcnt, dcvclop ultcrnatives � un�lcrcultin�. cnvironmcnt. to instrcam disch�rgc of ninoff from dcv�lopmcnts. ;ib �1��7:� I <;col�gy l.iUcr �n� �chris Ulocks PcrioJic bc•c�kout coul� (;Ican out and res�orc to natural 1tM I.(lU strc�im rhanncl. lri�g�r flooJing. concJition. 37 OO73 S I ty�rolobry nceelcrzilecl h�nk erosion As are� �bove TriU. OU73 f uture elevelopments nbovc "1'rib. 0073[i � of muin ch�innel due lo devclops, erosion of swale shouW use infiltr��tive cApacity of �i incr�a�u;J runoff upstrcnm. lh�il convcys it will caperi• soils in thc arca as fcasibl� to 'l'rih. 0073[3 capericncing cncc incrcasing cnpncity rcclucc runoff. Ucvclopn�cnts adjaccnt scrious inst�ihility ncar prohlems. Incre�se erosion to mnin stre.im ch�nnel shoulJ provi�Jc confluuncc with mnin slcm will occur ns strctim �ttempls n�cquate sctbacks from slor�s to due to dcvclo�ment. (Sce to scuk new cquilibrium prcvcnt slope [ailure. � gcologic �ppcndix.) c�ipacity. � 3�s O07;� 5 Gcalogy Conflucncc wi�h tribut�ry; None. Nonc. 1tM I.�iO crosiontil culs suggust rccent flooJ rsiiscJ stre�m � 3' al�ovic existing tlows. 3') OO73 S lluhitat llnbilnt in good condition. I3ank crosion will occur from • Plant some trccs in floodplain. RM I.(>0 Silt in suspcnsion; livc- prescncc o[ livcstock. corridor scction. stock hirv� acc;css lo sU'cum. - Pul in som� drop structures to crcAte pools. 4O OO73 7 G�c�lo�y G�ntlu (?0^/,) siJe slapcs in Slighl incn:ase in high flows Nonc. RM 21,5 p�islurclunJ. No cvidcncu proporlional to dcvclopcmnt of cr�si�n, but floocling upstrc.�m. rcportcd. I':SCL3,nP(: ' C-10 'I'rih. << Colluct. Cxitilin�; nnlici�atc� Ilcm Rivcr Milc I'c>int ('al�+o� I'ro�, 1'roj. ConJitions ��ncf 1'mhlcros (;onclilions �inJ 1'rohlcros Rccommcn�,itionti I 41 OO7:� 7 1ly�r<�Ic>bry Un�cicrmincJ sourcc pro�ua l..oc,ilizccl capacily problcros No rcgional facility proposccl for ItM 2.I S- ing Suhsttmtia) suspcn�fuJ will bccomc ntoru cvicicnt as lhis tribulary �uc to I�i�k of obvious �•S�� I�u� of sill in trihut��ry. ;irca acvelops. location, but basin plan may justify Slrcum uJuqu,�tcly a�commo- onc. dating incrc,isc�l runof[ ' [r�m upti�rc�im dcvclopmcnt. Q2 Ol)7:� 7 (ic�lc��y Slrenm cr��.sing wilh n�noff Slighl floocling, Mnintain distancc from 25-yr. floo�- ItM 3.55 of S.J� cfs. 13vi�cncc of plain using 3' abovic existing flows short-duration flooaing. ��s minimum ��idclinc. �i3 OO73 7 Geo�<�gy Lividencc for sidecuuing Widening �nd undercutting of None. RM ?�'iQ 4" tihovc cxisting flows. h�inks in response to pdacJ f lows. �1-1 OO7:� 7 C;colo�,ry Qn till soils, (>0'-widu None. Provides good index Nonc. ItM 2.95 flood pl�ins 1.5' abovc for cvaluation of system. cxisting flows with cvidencc for n�lclitionnl 1.5' dcpth. QS ()(17:� 9 IlyJrology 540? CxtcnSivc cxisting Wetl�nJ l�illing mny occur in s�rcn Monitor wctl�nd for filling; take RM 3.15. 54SQ is currcntly proviaing ��long north Uor�lcr of action to obtvin restoration if ��>5 R/U huffcring thc [low wetlund to increF�sd amount this occurs. Enforce wetland beforo it pus.scs into o[ potcntinl commercinl r��l protcction rcgul��tions. ch�inncl through King Coun�y cslulc. Subarca Jevclopmcnt tlousing nuthority dcvelop• m�y cause loc�tlized c�p�city mcnl. prohlcros in lowcr rcnchcs. 4G OO73 7 C;cc�logy In hautiing Jcvclapmcnt, C�ntinuc�i erosion �roun� Providc somc armoring �s b�nk �rotcc- �ZM �.2�1 vrotiion nraunJ culvcct s�ruclurc. tion (riprnp). cntr��ncc 3' �ih�vc cxirting , flowx. 1':ti('13.n I'(: G 1 l � �� , i. .. � 'I'rih. .l (;c�llcct. Lxixting Mticipa�cd Ilum Rivcr Milu 1'c�in� ('al�•oi I'ro�. Prol. t'on�ilions �in� Prohlcros <'onclitions and Prohlcros Rccommcn�i�itions d7 OQ7:� 7 (lcnlabry Pc��t ovcrlics till in Non�. Nonc. 1tM :�.55 wcUun� �ir�u. a� ��»� `� Ilahil�il Inslrc�un hahitat is poor Morc flooJing wilh incrcascd - Csti�hlish morc restrictivc; controls ltM ;i,(,U- auu to lack of ovcrh��J strc��mbc� �inc1 b�ink crosion on volumcs anJ rs��s of rcici�sc for `�•�� c�►nopy �inJ strc�unU�nk will occur. �icvelopmcnts. v�gcl�Uion in somc nrc�s. - Work wilh lan�lownc;r to providc I..ivcstak hzrvc �icccss lo fcncing <m�1 na�ural v�gu�ati�c strcam; hanks huvc bccn buffcr �ilong stream. croJuJ in somc �rc<�s. 4�) OO7:t �) C;coloby Strcam occu�ics swale in Nonc None. ItM �J,4 rolling tcrr�ce. No crosionnl strc�.s. SQ O(17:� I? [lyJrolo�,y 5401� No significant prohlcros. Arca planncd for only slight ruturc basin plan should consi�cr ItM 4.7,5 �dJi�ion�l dcvclopmcnt. No Wctl�nd 5444 for dctcntion facility problcros �ntici�nlcd, to �ssist in 111cviating downstrcam c�pncity problcros. , S I OQ7�L3 S I Iuhit�il Poor fish hF�bit�it. Sm<ill Incrc��scd Unnk erosion will GstAUlish nonerosive stormwater ItM .I()•.:�0 str�nm willi Unnk crosion occur. release rates and volumcs for t►nd i��.socituuJ pusturu future devClopments. with livcstock. 1':ti(:13,n1'(: (:.1? ��...�+,' 'I'rih. '.` (:c�llccl. Lxis�ing M�ici�alc� Ilum Rivur Milu 1'ainl Calc�c>i I'rn�, 1'roj. (`on�ili<ms ancJ 1'rohlcros ('onclitions un� I'rohlcnts Rccommenclations S2 Of)7a 1,4 Ily�lr�lobry 5415 Mostly unJcvclo�,cJ; high 1'utur� �lcvclopmcnt offcrs (:onstruct propose�i tightlinc p�ojcct ItM .3O-.SQ perecnlage o[ opun ficl�s op�ortunity to construct to prevent fuilurc of roacl z�n� p:istur�s. (3ank erosion r�gionnl dc;tun�ian facility, cmb��nkmcnt and tr�inspor�alion of �long wctit sicJc of SL 3l?th tis uncicvolopcd �t•ca �onsists mtitcci�l lo scnsilivc main �rcck W�iy Ihr�atens intcgrity of scvvral I��rgc, contiguous rc�chcs. of rot�Jwtiy. rarccls. L3ank undcrculting ' will acceler��tc, eausing f��ilure . of ron�lw�y ,ilong 10OU' of SCs 3121h W�y if only normal dctcntion rcquircmcnls mct. incrcased n�noff from suhhasin , now cicvclo�ing will �ggr.rva�c slopc f�iilures i�nc1 aclvcrscly imp�ict stutc fish htitchciy J�wnslrc�im. ; 5;� O(17a I ll�ihit�i� Ilubit�U �ownstre�m of SL Incrcasc�l flows mny causc - Clcan out dct�ris. ItM .SO 3121h W.�y. Culvcrt is scour �n� b,�nk crosion. • Providc R/U ns ncedcd at top improvcci from IZM .50 but of ravine. only marginnlly. I.ots af dcbris in strcam. S4 fl�7a 4 Ilahital I(illsi�c anJ roacJ sliding Bank erosion, scdimcntation Armor strcam bank and ItM .�i0 into slream ut USGS strcnm �nd ro�iJ [�iih�re exist. This rainforce roaa. g��ugc nt RM ..10. Ilt►bitnt will U� � big problcm with poor for fish auc to dcbris, incrcascd flows in [uture. roaJ, un� crosion prol�lcros. I';S('l3,nl'(' C-13 ��:.., �y ' � __ -- � � I i'�. ��`..�'' ��`"� I 'I'rih. �l (;ollcct. Ciaisling nnticipalccJ I�cnt Itivcr Milc I'oin� ('�i�u�oi I'i•on. 1'rni. C�nJili�ns <�n� I'rohlums Conclilions ancl Prohlcros RecommcnJalions SS QO75 �i IlyJrolc��ry Uuc la rclativcty slifiht No prohlcm5 nnticip��lcd as Nonc. � IZM .3i- Jugrcc of Jcvclopm�nt, ��rcu is pl�innccl to cJcvclop I.�lO thcru �o not appuar lo hc only slibhlly. �ny signi[icant prohlcros nt lhis timc. SG OpH I ') I l�ihiiat No major proUlcros othur Nonc. - Maintain strcam corriJor an�i ItM .10 thun luck of ovenc�aJ a�nopy bu[fcr. from 1a�.5 of lrc�s, vcgctt�- - Lncourage owner to fcncc strc�m lion. from nnimals. , 57 (1O�tl ') Cicolagy Culvc�l 2.S' X 2.5' p�sscs Incrc�scd flows will hnve Idcntify hydrocarbon sourcc ancl 1tM .�i2 under rond. Irridcscent minor incrcnse i� soil test to ev�lut�tc poUutants. hydracnrl�on shccn notcd on crosion. � Would bc bcncfici�l to isolnlc surfnce. Somc minor sidc- livcstock from sidcU.�nk arcas �nd I��nk scour notcd. establish veget�tion on banks for erosion control �nd filtration. 5�{ OO��t I ') I l�ibi�ut Slre�nt has bccn �fitchcd 13ank erosion will uccur. - Rcvegct�tc strc�msidcs. KM .fi2 through paslun;. Uirt - Cn�ourage owncr to fcnce off strc�m bunkx uxposed with fcw or from livcstock. no trccs to shade stre�m. 1':S('13.n1'(: C-.14 � , �...✓ �� 'I'rih. �l <:oiluc�. L:xitiling Anlicipnlc� Itcm Itivcr Milc I'c�inl (';ilc <�i 1'ron, Proj. (:on�litions �incl Pr�hlcros C�n�itions �nd 1'rohlcros Rccommcn�ialio�s S') (1(1'�I ��t 1(ycJro�o�,y 5410 I�.�kc Mcricii�tn �rc�� nc,�rly Arca trihut��ry t� I�ke is [3asin pinn shoulJ considcr IZM I.IO Cnlirciy ��cionca wilh nc��rly complctcly devcl�pcci, moclificAlion of I.��kc Mcridian outict singlcd�imily resiJcnccs. so IitUc changc is t�ntici- to proviJc consi�crably morc dctcn- I.�ikc ticts �s suUrcgional p.�lc� For sysl�m, Arc� south- tion with vcry minimal �Itcrntion �I rce�iving bo�ly is effee- east of I�ke h��s yet to fully of I�ke Ievels, 'f'Ihis could substan• � tivuly huffuring r��nof[ �fuvclop �incl potentiF►I exisls lially re�uc:e fulure e��pacity li to Jownstrcum rcnchcs. for loc�lizcd comcy�ncc problems immccliutcly downstrcnm. I Somc po�cntial for [loading cap<uity prohlcros Uint should I of m�hilc homc p�rk down- bc ��ilressc�f l�y downstream struam af I�ike Jue to �n<�lysis for ncw devclopments. ' � passiblc lin�iled c��pacity in pipc Jisch��rging from 'i onsil� pond. �iQ (lU�)In 1:� Ily�rolobry 54Q�) U�wclo�mcnt is c�using in- Capacity problems will Construct berm and control structure RM ,17- cren.u:d cnpacity problcros incrc�se �s upstref�m areas at outlot to Clark Lake to possib�y ?•�S and r�;sulling incre�sed Firc �evelop�d. "detain" runofF And help reduce volume of runoff, acccler- flow downstrcam. If a high-density ting crosion of strcum multi-family project is propscd chnnncl in subdivisions near Inke, ns is likcly, thcrc nc�r golf cour:nc. would be opportunity to develop bcrm and control mcasures. Address c�pacity problcros at Clark I.ake hy cl��nnel armoring or upsizing pipe. G I O0�)1�1 13 i iuhil�it AltcroJ portion of strc�m f uturc problcros only likcly Placcmcnt of somc I�rgcr rocks to ItM .2Q duc to rond construction. lo bc scouring of smnllcr crc��tc pools nnd cdclics. All rifflcs with [cw or no rock �iuring pcnk flows, �uc pools. /\IJcr shiicics struum to import of rock wcll. I':S('13.n1'(: (:-I S '► �. � , � � �� '1'rih, .l Colicct. L:xi�ling nnticipulc�i � licnt Itivcr Milu Pc�inl C,i�c c�i I'ro�. Pr�j, (;on�Jilions �n� Pr�hlcros CnnJilions nncl I'rohlcros Rccomman�ations i, (�2 0(1')I n 1:� I lahiltil Slt'cant hus t�ccn �il�he� �n�f M�rc bank crasion �ncl S►ahilize bank an� shadc strcam by ��M •�� most slrc��msiac vc�clntion sc�limcntalion of channcl plunting n�i�ivu vcgctution. rcmovc� through �olf coursc. cxpcctc�i. Somc hi��k crosion occurring. Vcry IiUlc ovcrh�i�d vegc- . tiition ulonbsiJ� strcum. fi:i (1(l�)In 13 Il.ihil�it C;ooei sU•c�msi�c vcgctntivc 'I'herc will bc �Jditionnl loss - Cnhnnce use of Clark L,akc as R/U ItM 1.2O- covur exccpt through of n��ivc vcgctalion nlong- f�cility to rcduc� pciik flows. I 2.2Q shopping cuntcr. (�cnc�a� si�� strc�m. Mor� flooJing - I'ur�hcr r�stricl stormwatcr ci�nopy vnrics by property.. �nJ crosion will occur. ratc �nd volume rcutcasc ratcs. �i•3 O(1�J I L3 I 5 1 fy�rolobry 54Q7 Moclurn�c �mount of current L.o��lizca c��p��city problems Protect anet Possibly enhance wetl��n� i ItM .��2 dvvulopmcnt. W�Ilancf 5240 may occur in upl�nd tribut��iy as upper arca cicvclops, provi�cs It/U, protccting ��s nrcas dcvclop. Wctland, , �owns�rcam ch��nncl from if prescrvcd, will continuc �' incrc,�u;J volumc of ninoff to providc !t/U for increasc� as arc�i cJcvclops. No s�g- flow gcncr�tccJ hy ncw �fcvclop- nifici►nt prohl�ms in airou, mcnts. �i5 OO')? 3 C;cology l.illlc Soos (:rcck ncnr norlh Nonc. None. ItM .tU murgin o[ Covington Channul. No ruportcJ or obscrvccf flow or crosion prol�lcros. ��, (1(1')2 3 C;cology UeUris �nJ bnnk crosion Incrcase� bank crosion is Re�ucc storm flows by use of stricter �Z�'1 •:�� fatmJ, cxpccicJ. stormw�ter controls, new R/D facili- tics, and fcncing of strcam. incrcascd flows. I';S('11.n1'(: C-1< '1'rih. (:oUcc�. Lxis�inb Anticip.�tcJ �,� Ilcm Itivci , = I'c�inl (',ilc c�i I'ron. Proj. (:on�ilionti �inJ I'rohlcros`""'� Conclilions �nJ Pr�hlcros RccommcnJ,�ti�ns (�7 (1(1t)? 11 Ily�rol<>�;y S��(> 1.ittic Soos (:rcck lrihu�ary ns Jcvclormcnl continucs, No apparcnt suilablc sites for ItM .;�5_�,�,q h�s hccn conts�inc� �nd ma�i- cxisling c��p��ci�y prohlcros rc�ional dct�nlion facilitics to h�lp curctl t►s it pa�.tics through wil) he furthcr nFgrav�teJ by rc�uee [low cntcring problcm rcuehcs. pluts. 'I'his has rc�ucccl incro�isc� volumc of runoff, Ad�ress incrc»sc� n�no[f volumcs from cup�icily of sU•ctim in kcy which prcviously w�s able lo ncw �cvclopmcnts wilh infillrntion li uruas whcru resultunl cnl�r groun�wi�tcr systcro systcros whcrc fc�siblc. Channul �� chnnncl ovur�opping c��uscs tlircclly. capacity c�h�nccmcn� pcojucts (surh as floo�ling of somc homcs scmi- I'rojcct S41�i) shoula bu constn�ct�� lil y�a�rly. to prcvcnt furthcr property cJ�mngc. 13�sin plan shoulJ� address potcnlial of dct�ining n�noff from upstrcam �� tributnry arc� to allow for incrc�sccl I flows. I �� OO`�2 I I Il�ihiti►t Instrct�m huhil��t is goo�1. Incrc�scd flows will cswse Gstnblish iindisturbed strcam RM .(>S Stn;um corridor mos�ly in flooding �nd erosion. buffcrs. II goai condition. Manicurcd I I�wns n�n down to strcam in • pli�ccs. � ��') OQ')2 I I Iluhi�ut Some dcbris found in stre�m. Bank erosion, [looding, and - Stricter control on R/D release RM I.C�O 11<ibilut gcncrully good. suaimcntation likcly to occur. ratcs and volumcs should be established. - Maintain natural buffer along most of cl��nnel. 7U (1O')2 14 Gcolobry Me�ndcring scgmcnt of Po�cntially unst�ble banks If construction were considered, RM 1.7Q l.,ittle Soos; po�.sible woul�l a[feet construclion. recommenJ cvalu��tion of soils and coUuvinl crccp in i�Jj,�ccnt stability o( sitcs. siJuh�nk �rcas. 71 O(1`)2 1-1 Ilyclrolo�,ry I,itllu currcnt Jcvclopmcnt. �1s arca �cv�;lops, channcl l�ulurt; devclopmcnts shoulJ RM 1.7Q- No tiignific�nt pr�hlcros c�ip,ici�y pr�hlums will bccomc utilizc infil�rative ca�ac:ity of �•��S ollt�r lh��n some I�c�li�ecl morc evident nnd irtcrensea soils to rc�uce incrensed n�noff h.ink ovcrtopping in,rorlion5 urosion will occur ns slre��m volumcs. Providc ��dcquntc flooding , of mtiin ru.ich. Innundntion �it�cm�s lo scck ncw cqui- �rolcclion for futurc ru�off con- will lik�ly hu limilucl lo lihrium c�i�iicity. �ilions. tiJjciccnt ugricultur�il I�in�. I':S('13.n I'(; C-17 � ��.,, , . .� I',1��1�• .�- ; „"�r"' , ..,. � 1 (:c>Ilccl. Lxitiling AnticipatcJ Itcm Itivcr Milc I'c�int C,ilu o 1'ro�. I'roj. ('ondilions nn� Prohlcros ('on�itions i�n� Pmhlcros Itcc�mmcn��i�ions 73 p(1`)2 14 Gcolo�ry i'�tuntial for floocling in I'o�.tiihlc floo�iing (minor). C:onsiJcr upstrc��m �ictention. ItM ?fiQ I�w urcf�s; vcry low si�c- slo�;s. 7:i Q(1`)? 14 lJ�ihilat Somc Jchris founa. Bank crosion �nd scdimcnta- - Cstahlish strictcr control on RM 3.fiU tion likcly. R/U rcicasc rates �nd volumcs. - MAintAin n�tural lwffcr nlong most of channel. 7a pq')? I�i C;colobry C�+crbnnk [lows. Po�.sible flooding (minor). Considcr upstrcnm �ictcntion. RM 3.:�5 7S OO'>2 !f> llahilt�t i,ots of k�nd in hedlo�d. More sedimenit�tion likely, - Cstablish stricte;r control on RM 3•�i0 Strvt�msiav bu[fur generally ns well i�s b��nk erosion an� R/D release rates anJ volumcs. goo�i. � floocling, - Maintain natural buffer along most of channcL 74 QO`)? 1(i Gcology Rcsidcnt reports trccs down Some continued erosion. Some clean-out of trc:es and 1ZM 3.AQ in sl�'cAm and siacb�nk limilcd armoring of banks would be erosion cvidcnt. beneficial. 7Z OQ')2 1G llyJrology 5412 Little cucrcnt dcvclopmcnt. No prohlems anlicipated Consider Wctland Sa80 for a RM 3.G5. som� Ioct�lizeJ b�nk over- ns vcry littl�s nddltion�l detcntion site, in a future hAsin 4.7,5 top}�ing in portions of m�in dcvclopmcnt is pl�nncd for rl��n, in ordcr to allcviate down- rcnclt hut innunJ�tion is tliis nrca, stream c�p�city problcros. probnhly IimitcJ to ndj�ccnt agriculturtil I��nJ. 7��t cic)'�2 IC> Iliihiiut StroAm ditehcd, I..itUe I3�nk erosion �nd flooding of - Work with land owner to fence off 1tM a.00- strcnmsicJc vcgctution �nd now "improved" pasturc will stream. �•�� no ovenc�nd c�nopy. Somc occur. - Plant native vegctation buffer. livestock-rcl�ted erosion nnd runo[f. 7') 0O')2 Ih Gcolobry Or.ingu iron prccipil�te Somc loc�lizca oaygen Natural deposition as iron is . 12M 4,GS nolcd in sU'c�tmhc�l nc�r �icPlclion of fish h�l�itnt, cxch�ingcd for o�,ygcn. oullut �o [��kc Yo�mgS. I':5(;l3,nl'(; C.�� ____ __ _ _ � � � -� � � -....� I �r��i,. :c c:<�u��. __ � L'aititing Mticip�►tcJ i Ilcm Itivur Milc I'c�int Calc�oi I'ro�. 1'rc�l. <:�nJilions ��nJ I'rohlcros Con�itions �inJ f roblcros Rccommcn�ations �, �tU (N)')3 1�, Il�ihi�al Iron-fixing hacicriu un� Nono. None. I' IZM 4.1�5 u�.�a:iutcJ oJ�r prusc�t. Sourco unknown. l.��ku Youngs rclu�sc r�i1u is minimum 2 �:r. ��tl (1O`)3 14 Ilubi��ii Vcry sm�ill trihut��iy wilh �rosion anJ •flooding from Recluc� storn� flows Uy use of slric�er ItM .UO.,�t7 un�efineJ ch��nncl in pl��ccs. futurc �uvclopmcnt likcly, stormw;��er controls, ncw It/U Ilahil�il v,�luc f�r fish is facililies, nnJ fcncing of str�am. low. ' �ti2 OO'�3 I�l (;�olo�y 1'oorly cicfinc� slrcam Nonc. N�ne. ItM Q.35 cht►nncl with no cvi�fcncc of crosion. �iz Q�1`�a �3 C,cology Minor si�cbnnk ceosion Slight cnlargcmcnt of Loc11 �rmoring/ri�r�p ap�licd by ItM O.3Q hclow convurgcncc of lwo crosional fe.uures. owners wouW rc�uce impacls. culv�rl/crccks. �`t� Op'>a 13 Ilal�ilut Strcnmsi�c vcgut�tion h��s Thcrc is � pos.sibility of - Provide stormwater control RM .0.30 bc�n rcmov�d l�y logging. b��nk erosion duo to incrc�scd - Fstttblish stream corriJor buffcr. flows from development. - Improve stoemwater control. k5 �1p`�.1 13 Iluhitat Imt�orl�►nt: 1'his is s� s.�lmon Mor� btink crosion will occur. - Lneour�ge property owncrs to [unce RM lA0 spt�wning s�rcam. Some bank stre�m. crasion probubly cluc to liv�- - 1'rovidc stre�m corridor bu[fer, slock. - Improvc slo�•mws�tcr control. ttfi (1(l'.)� I:� Ilahilal 'I'h�rc is i•ivcrinc wclland Nonc. M�inlnin wctlancis and stream corridor ItM I.$Q just cast of .lS�itl� Avc SLi. in nalurt�l st��tc. 1':S(:Il./11'C C-19 �;;;., _ � � � ..w.., 'I'►•ih. �� ('c�llcct. L'xisting Anticipalc�l Ilcm Itivcr Mil� I'c�inl C�iic�c�� I'rc�n. Proj. (;on�ili<ms ��nJ I'rohlcros Con�ilians anJ Pr�hlcros Rccommcncltitions ti7 O(1`)S 17 Iluhilut Smi�ll, c�hcmcral strc�im Nonc. �ncour�g� properly owner lo fcncc ItM .:�5..'tS fl�wing through pas�uru, strca�m. I,ivutilock c��using l��nk �rosion. �`��`i O(1')S/1 l� Ifahitat Uitchc� arca; lols of C;ontinucJ filling may Mainlain strcnm corri�ior. Cnforcc RM .00-.2ti �fcbrit. occur in flooct pl�in. gr�ding and filling or�inance. fi') OU')S/1 I��i Il�hil�it Uchris cxists in s��lmon 'l'his will h�vc minimal effcct M��in�nin strcam corriJor in ItM .�iS sp,�wning arc�i. on h�bit�l. nalural condition. `)U OO�>7 ln Gualagy Slrc�m flowing lhrough Continuing �djustmcnt will The kcy word is "cquilihratcs." I2M ,35 clvvulopmcnl shows minor bc�i oc;cur unlil systcnt est�hlishcs Disturb�incc o[ thu ��itural syst�m nnJ h�ink crosion �s strcam n m�turc, Jcvcloped wntcr- h�s initi�tcd or in�uced readjustmcnt cquilibrUcs to ncw ch�nncl. cours�. in thc bcd �s a function of new gradicnts, m.ilerinls, nnd othcr hydraulic factors. In timu, thc s�rcam will cstablisl� itsclf in another "nalural" cquilibrium, as.suming no ncw variablcs such as ad�ed flows or alteration of chpnnel gcomctry nre intraJuccd. ')1 OO�)7 I� Ilahilat llcbris �in� fill in wctl�in�. Morc filling may occur. Cnforcc gra�iing an� filling ordin�nce. ItM .:�5 I':ti('U.nl'(' r.?� �� I TASK 3 � FIELD INSPECTION EXHIBIT J . Off-Site Analysis Drainage System Table , OFF-SITE ANALYSIS Dn��NAGE SYSTEM TABLE � ' Surface Water Design Manual, Core Requirement #2 Basin: Soos Creek Subbasin Name: Subbasin Number: Distance Observations of Field Inspector, Drainage Component Drainage Component from Site Existing Potential Resource Reviewer,or Symbol Type,Name,and Size Description Slope Discharge Problems Proble�r�s Resident Constrictions,under capacity,ponding, Type: sheet flow,swale,stream, ovcrtopping,flooding,habitat or organism channel,pipe,pond;size, Drainage basin,vegetation,cover, destruction,scouring,bank sloughing, Tributary area,likelihood of problem, See Map diameter,surface area depth,type of sensitive area,volume 9h Ft. sedimentation,incision,other erosion overflow pathways,potential impacts �O Sheetflow from closed Flows over sidewalk 2 0'—20' Flows backup through site to depression on-site into property to south of site R.O.W, of Petrovitsky Road � CB in R.O.W. to 12" SD Flows east to MH in R.O.W. 0.5 20'-250' None noted None noted 0 SD discharging from MH into SD conveys runoff from north side 0.5 250'-280' None noted None noted BPA easement on south side of R.O.W. as well of R.O.W. � Stream,4'deep through thick Flows southeast under BPA 0.5 280'—680' None noted None noted vegetation,5'-wide gravel easement and becomes shallow bottom and meandering � 18"RCP Under access road for BPA 0.5 680'—720' None noted None noted easement � Meandering stream through Flows east 0.75 720'— 1470' None noted None noted thick vegetation 8 42" CMP culvert under 122nd Half filled with gravel 0.75 1470'— 1490' None noted None noted Place S.E. � Meandering stream through 15' wide,flat side slopes --- 1490'—3520' None noted None noted wetland � Twin 42"RCP culverts Flow under S.E. 182nd Street 0.5 3520'—3540' None noted None noted � >>o�i_ooz_do��Irli�i�,,; � TASK 3 FIELD INSPECTION The only problem reported or observed during the resource review is the fact that the site drains to Soos Creek, which is surrounded by a sphagnum bog. In addition, the subject property drains to an on-site closed depression. Based on a review of ihe drainage complaints in the downstream drainage course, there are no existing constrictions or lack of capacity in the existing drainage system. Nor did the field reconnaissance find any potential restrictions of lack of capacity in the existing drainage system downstream from the site. 3.1 Conveyance System Nuisance Problems(Type 1) Conveyance system nuisance problems, in general, are defined as any existing or predicted flooding or erosion tha[ dces not constitute a severe flooding or erosion problem. Conveyance system nuisance problems are defined as flooding or erosion that results in the overflow of the constructed conveyance system for runoff events less than or equal to a 10-year event. Examples include inundation of a shoulder or lane of a roadway. Overflows collecting in yards or pastures, shallow flows across driveways, minor flooding in crawlspaces of unheated garages/outbuildings and minor erosion. Based on a review of the drainage complaints provided by King County, there is no evidence of past conveyance system nuisance problems occumng nor is there any evidence of any occurring during our site visit. However,property owners to the south of the project site have indicated that during peak storm events the on-site closed depression dces backup through the site onto their property south of the site, almost to their access road to property further to the east and this is all � prior to the on-site closed depression overtopping the S.E. Petrovitsky Road right-of-way over ihe sidewalk and into the conveyance system of S.E. Petrovitsky Road. 3.2 Severe Erosion Problems(Type 2) Severe erosion problems are defined as downstream channels, ravines, or slopes with evidence of or potential for erosion/incision, su�cient to pose a sedimentation hazard to downstream conveyance systems or propose a landslide hazard by undercutting adjacent slopes. Severe erosion problems do not include roadway or minor ditch erosion. Based on our site visit and the King County drainage complaints, [here is no evidence of or potential for erosion/incision sufficient to pose a sedimentation hazazd to the downstream conveyance systems evident anywhere along the downstream drainage course. 3.3 Severe F7ooding Problems(Type 3) Severe flooding problems can be caused by conveyance sysiem overflows or the elevated water surfaces of ponds, lakes, wetlands, or closed depressions. Severe flooding problems are defined as follows: • Flooding of the finished area of a habitable building for runoff events less than or equal to the 100-year event. Examples include flooding of finished floors of homes and commercial or industrial buildings. Flooding in electricaUheating systems and components in the crawlspace or garage of a home. Such problems are referred to as "severe building flooding problems." 1]Ol l.001.doc[1P1/dm] � • Flooding over all lanes of a roadway or severely impacting a sole access driveway for runoff events less than or equal to the 100-year event. Such problems aze referred to as "severe roadway flooding problems." As mentioned previously, there is no evidence of flooding from the drainage complaints or from our site visi[downstream of the subject property. However, the downstream drainage course is in a streambed and there is a 100-year Floodplain Map by the Federal Emergency Managemen[ ' Agency of Soos Creek with potential flooding during the 100-year storm event all along the streambed course downstream from the subject property. Most of the area surrounding the downstream drainage course is developed property with single-family residence and condominiums, etc., located all throughout the area. The downstream drainage course dces flow through a large wetland area comprising over 100 acres, which is all forested and will remain that way after development of this project site. , Almost the entire drainage course consists of following Soos Creek. The portion of the li downstream drainage course investigated by the site visit and a review of the soils map indicates � that the downstream drainage course occurs through Alderwood, Seattle muck, and Everett-type , soils, all of which are till-type soils, except for the Everett, which is an outwash-type soil that is just a small portion of the downsveam drainage course. The field reconnaissance for the off-site analys:s drainage report was conducted on May 14, 2003. It was raining slightly at the time and the skies were overcast. The high temperature on this date was approximately 55 to 60 degrees. 1101 I.00l.doc[JPl/dm) � TASK 4 - DRAINAGE SYSTEM DESCRIPTION � AND PROBLEM DESCRIPTIONS � TASK 4 DRAINAGE SYSTEA�i DESCRIPTION AND PROBLEM DESCRIPTIONS Runoff leaves the site either by sheetflowing off the north property line of the site after overtopping the closed depression, or else sheetflowing off the east property line of the site immediately into the same downstream drainage course, although a little further downstream from the previously mentioned overf7ow. The vast majority of the runoff leaves the site at the north property line after overtopping the closed depression where it flows into the right-of-way of S.E. Petrovitsky Road and enters a pipe conveyance system for approximately 200 feet until discharging into a manhole where runoff is collected and conveyed underneath S.E. Petrovitsky Road and discharged on the south side of S.E. Petrovitsky Road, immediately into Soos Creek. Runoff then courses south for the most part, passing through an 18-inch RCP culvert under an access road and continuing easterly through thick vegetation, forestland, and wetland areas passing through another culvert under 122nd Place S.E. After that, the runoff enters the large Soos Creek Wetland No. 2 where runoff courses southerly all the way to 182nd Street S.E., where it is conveyed underneath the prolongation of that street through twin 42-inch RCP culverts. For a review of all the drainage complaints provided by King County see E�chibit K — Drainage Complaints. There are no complaints concerning low conveyance capacity, flooding, or erosion in the downstream drainage course within a mile of the site. We have investigated the attached complaints that we believe to be near the downstream drainage course based on the complaint list. After review of each complaint there is none that were concerning runoff from the subject properiy or any other properties concerning low flow conveyance capacity, flooding,or erosion. i 1011.001.doc[JP1/dm] � i EXHIBIT K Drainage Complaints � MAY. 8.z�03 3�01PM KC WLRD IV0.616 P.liS ' � I /C� l� Kin�Coun.ty V�ater and Land Reso�rces �L,R) Division 201 S Jackson S�,Suite 600 �� Seattle,WA 98104-3855 � � O� Date: Number of pages including cover sheet: � To: C��O��o� ��f/d/�� 'rom: Candi McKa.v_., En�. Teci�, II F�: �� l� ��8� . WLIt Stormwater Services Section Phobe:�20 }2_�6-�900 Phone: �� Fax N`"umber: 206 296-0192 -� 11�� RE: Leve12 Analvsis To follow is a list of complaints recei�►ed by the Water and Land Resources Division Stormwater Services Section. �on�plaint numbers beginning prior to 1990-7XXXX have been archived and are no longer in our possession. They can still be retrieved,if necessary,but vvill take additional time and may not be benefxcial to your research due to tlaeir age, development which has occurred,etc. If you are interested in reviewring the actual complaints,they can be pulled(time pernaitting) for your review, Copies can be obtained for$ ;15 per pa.ge, and$2.00 per page for plans, Kevs: �; - �ry�e of L►vestigatiob T e of Problem C Ac6on Request ""' - DC,A Devetopma►t/C�mehuction BCW &usincae'fosClasn Watcr DDM -�>��iirage-M"�saetlaneaus. IX� Rcxponseeulra�airy DfiS �-:Ek�aBo-8ro�ion/Sod-imecuation !CI. Qeim DLE Dreinqge—I�ndaliddP,mth Movcment EH Enforxment oe Hold lNQ Drainage—Oeneral Inqu►7' �2 Enfo�►ont Raview MMn Maintenance-Aesthetios S1,SZ,SN3 BnginccringStadies Mttiff Maintcnancc-Flooding FCC.FCR,FCS Pacility Cornplamts MMa Mai,rtwnncc-Gcnorat RR Pac�lty Hn�meoting Re�icw r�tM Memtmance-Mowing •LS Iawauit MNM Msa�teannce—NcedsM.intcna►a NDA Ncighbochood D�smage Assistance SWP SWM Fcc Qaestioas wQe wata Quality eomptainc wQB water Quac,ty—Besc Managamenc rracaces wQB waca Quaury Bnf�cemmc wQb waur Quatiry—Daa�in6 WQR WaL�r Qua1�lY&�ne�ein8 Raviaw WQI Wwkr Quality—IIticit Connea�n wQn wnur Qosury Aumc wQ0 wuer Qosury—ochc� •Subject w Pubhc Disclosore mqfliremm�s 1.Reoeipt of wricpcn roqucee for doanncm9 2.Rov'icw and approvnl hy Proexuting Actomayl'�officc :-� .. - MAY. 8.2�03 3=01PM KC WLRD N0.616 P.ZiS Kinp Camty Water at�]Land Resma�ces phtl�On-Qra�pe Se�r�s Sectt�t :'•,M Se�ch Pr�nted: 5/B/031:29�59 PM Cemplak�t i'ma Type o�Prok� 1Wdr�nf Pro�d bn�net�ts i�os Pape I�mher Code - 1974-0116 C DRNG 12517 PE7aOV17SKY RD SE CASC/�pEVISTA PLAT AREA 656F7 1975-0148 C FLDG 12210 SE�PETAOVITSKY RD 656F7 1977-0073 C DRNG 116TH AVE SE/PETROVI HEADWA7�f�S/SOOS CRK 656E7 1982-0224 C FLDG 11325 S�1�6TH ST CASCADE VISTA 656E7 i982-0548 C 116TH /SE 775TH ST DEPLETION OF WATER TO POND 656E7 1983-0361 C DRNG 12 711 SE 176TFi ST fLLEGAL FILL 656F7 1983-OGd6 C FLDG 12210 PETROVITSKY RD $E CASCADE V1STA AREA 656F7 1984-029i C 11417 SE 1801�i p� SINKING YARI� 656E7 1984-0298 C FILL 18b04 112TH A1/�SE ILLEGAL NEAR: 17409126TH AVE SE 686E1 1964-0304 C 17411 117TH AVE SE FILL 656F7 1984-0310 C FLDG 18019 118TM AVE SE BENSON H1LL AREA 656F7 198a-0315 C DRNG 18504 112TH AVE SE EASEMT BI.KED/17409 126TH AVE SE 656F7 1984-0310 C FILL 18504 112TH AVE SE ILLECaAL�4 17a09 126th AVE S� 656F7 19540322 C FLDG 1260z SE 176TH 5T - - 656F7 1904-0398 C FLDG 126d2 PE�`RDVITSKY RD -' "-' 656F7 ,«�.� •+ � -;;_: 1985-0235 E DRNG � SsnScCy,flQD-COMP BY CmDT 656�7 ..�:-f�-�-..- �QB5-0235 EH WQI . � . BsriStly ftQD-COMP BY CmDT 656F7 �� 5E 7) 656F7 ___ D604 C FII.L 17232 116TH AV� SE DRNG OBSTRUCTION 656F7 1985-1421 C FILL 12234 SE 178TH ST TO GFiADING 656F7 1986-0284 C FLDG 12137 SE 172ND ST FLOpDED LOT 656�7 1986-0907 C FLDG 175b� 1177N AV� $� $1'EA1�I1 ThIRU AREA 656E7 �sss-0907 ER P�PE ��500 ��7THaV� sE TRFRTOBA�n-GR�G � s�s� 1986-1047 C FLDG 1�665 111TH A1IE g� 70 SMALL OF PiPE 666E7 1987-0=i09 C FLDG 17685 111TH AVE SE INADEQUAT�t�ANG/PLUCaGED 96-1047 656E7 , 1987-0433 E DRNG 17661 109TH AV� SE DITCH OBSTRUCTION 656E7 � 1987-0499 C NO7 IN FILE. 656F7 I 1967-0723 C FLDG 17635 122ND PL $� SILTING&POLLUTION-P�7ROVISKY CON 656F7 '� �98�-0et7 C FILL 12637 S� 176T�i_.ST WETLANDS/SE PETROVITSKY R�n26TH s56F� 198�-0817 ER WE7LAND 12637 SE 176TH`ST BALD;LD ACT,Spl'BALD GRDG. 656F7 . ,.,,,.,;. 1987-0895 C FILL 18217 118TH A1IE SE FOLLOVII FROM GRADING 656F7 ' 1987-0095 E FIHL TO RD�FOEI COS7 EST.IOORE. 656F7 I 1987-1123 C DRNG 17324 117TH AVE SE HOLE AT END OF D�iNG PIPE 86-0129,111 656F7 � 1987-1194 X DRNG 18217 1187H AVE $� B�OCKED COUl�ITY DRAINAGE 87-0895 656F7 1968-0319 C DRNG 17827 116TH AVE g� DRNG DITCH/S�OPEIFRENCH DFaAIN 6S6E7 1988-0382 C DRNG 12505 SE 172ND ST DRNG DITCH-COLOR OF WAT�R/SOOS C 656F7 1990-0271 C DRtvG 12420 5E P�7AOVISKY RD DRAIP(AGE CONSTRUCTIOWSTORM EVE 656F7 Page 1 af 4 MAY. 8.2�03 3=01PM KC WLRD N0.616 P.�iS �� TYpe of Pcobie�q Addre��f� I�nnlents Ybroe PaOe � 66 GL FLDG 12602 SE P�TROVI7SKY F#D CL#12867 DUE MAY 656F7 1990-0664� E MANHOLE FAtLURE 656F7 1990-0809 C DRNG 17709 114TH P! gE SOGGY YARD/IN CRAWLSPACE 656E7 1990-1530 C FLDG 18427 112TH AVE SE 656E7 1990-1531 C FLDG 18427 112TH AVE SE 656E7 1991-0031 G FLDG 18217 124TH AVE SE STORM EVENT/NO DITCH PON�ING 656F7 �-- 1991-0099 CL FLpG 12602 SE PETROVI7SKY MEMO:TO FA 656F7 1991-0698 C SPRING 11504 SE 1�8Tf-!PL FILLfNG,M1AF POND 656E7 1991-0652 C FLOODING 12615 SE PETROVISKY RD WATER FROM BANK 656F7 1991-0852 SR F�OODING 12615 SE PETROVISKY AD WATEI-1 FPOM BANK 656F7 1991-1023 C FLOODiNG 11633 SE 180TH ST WATER FROM ROADWAY 656F7 1981-1087 C FLOODfNG 18216 124TH AVE SE LACK OF DRNGMEW HOUSES 656F7 �— 1992-0571 C DRAINAGE 12301 SE 172ND DITCH CAPACITY-OLD PROHLEM 656F7 1992-0571 SR DRAINAGE i2301 SE 172ND DITCH CAPACITY-OLD PROBI.EM NOT Np 656F7 1992-Q609 C DRAINAGE 17225 125TH SE CASCAD�VIS7A STUDY 656F7 1993-0062 W�C WQD97413 1193U SE PE7ROVITSKY RD 656E7 �'— 1993-0062 WQE WaD97413 11930 SE PETROVI7SKY RD DUMPING FLYER-STORM DRAINS 656E7�-- 1993-0161 C pRAtNAGE 17033 116TH AVE SE SOGGY YARp 656E7 1993-0186 WQC WQ-OIL 12301 SE 172ND SEE 91-1106 656F7 1993-0338 WQC OIL.DUMp 12000 SE PET(�OVITSKY RD SWM DIDNT ENF ACTION 856F7 F . �70 C DRAINAGE 17113 127TH AV�NUE SE WAT'�R LI�1�fE I.EAKS 656F7 _ : ��;;__._ =0644 WQC DUMPING 11930 S� PETAOVITSKY AD SEE�J3-0062 656E7 {-- 1g93-1059 E PIPE 12700 SE PE�FiOVITSKY CASCIADE�VISTA/BRODKA 656F7 1993-1059 ER PIPE 12700 SE PEfROVITSKY CASCAD�VISTA/BRODKA 656F7 1994-0128 C DRNG 12420 PETROVISKY RD NEIGHBOR CONSTRUCTING POND 656F7 i 1894-014�4 C DRNG 17925 116TH AVE SE POSS FILLING VIpUACT PLAT MORNING 686E1 1994-0�150 WaC ILlIHKUP 12517 SE PETROVITSKY RD SEPTIC PROgLEM 656F7 1995-0200 C DITCH?S 16204 116TH AVE SE LACK OF CONVE1fAYNCE ON PVT PROPE 686E1 1995-0492 C PONDDRN 11501 SE 173RD ST hAA1N7ENANCE O�PRIVATE��/D FACILITY 656E7 1995-0492 NDA PONDDF�N 11501 SE 173RD ST IulA1NTENANCE OF PRIVATE FUD FACILI�Y 656E7 1995-0492 RN POfVpDRN 11501 SE 173RD ST MAIMENANCE OF PRIVATE R/D FACILITY 856E7 1995-0535 WQR MAINP. 17421 120TH W SE fi56E7 1995-0649 C FLOODING 12602 SE PE7ROYISKY RD BRObKA/W�RELY DISPUTE 656F7 1995-0790 E DRAINAGE 12632 SE PETROVISKY RD OPEN LAWSUIT BEfWEEN WORLEYAND 656F7 i995-0790 ER I�RAINAG� 12632 SE PETROVISKY RD OPEN LAWSUIT B�'i'WEEf�1 WORLEY AND 666F7 1896-0591 C CREEK 17405 1�GTH AVE SE PL. � GEp,CULVERT 65fiE7 �.. . . 1996-0679 C FLDG 12031 SE �170TH PL IMPACT TO PVT PROPER71(FAOM UNMAI 656F7 1998-0757 C GRADING 17728 114TH PL � SE SHEET FLOW FROM A[�JACENT LOT 656E7 1996-0938 WQR �iL•POND 17200 116TH AVE SE SEND LET'fER W/MCL ATTACHEI? 656E7 1996-1135 C w-aR 17321 125TN AVE SE WATFA PONDING AT END OF SAC NO RD 656F7 Page 2 of 4 IhAY• 8-Z�03 3=01PM KC WLRD N0.616 P.4i5 6wnplel�t TYue Type ot Problem Addrass ef Pr�em I�uients i�ras P�e �"8�)�P 60d8 69 WQC OIL 12105 SE 1707N PL URBAN DRAINAGE DiSCHARGE INTO CFiA 656F7 1996-1236 C FLDG 17023 113TH AVE SE APPARENT IMPACT TO PVT PROP OP�N 656E7 199&1236 RR FLDG 1?023 113TH AVE S� APPAREM'1MPACT TO PVT PROP OPEN 656E7 1996-2050 C FLDG 12601 SE PETROVITSKY RD NAT CHAL SEDIMENT IMPAC7 CIP PRO.1? 656F7 1996-2071 C FLDG 11828 SE 1BOTH ST INAD�QUATE CONV�YANC�OFFSITE FL 68sE1 4-- 1996-2071 R FLDG 11828 SE 180TN ST INADEQUATE CONV�YANCE OFFSI7E FL 686E1 �, 1996-2125 C DANG 17311 1177H AVE SE TREES IfV CHANNEL, DOWIV FROM GAINS 656E7 1997-0586 C DRAINAGE 17310 119TH LN L5 S� PVT PR08 SINATION REMEDIED 6EfWE 656E7 1997-0692 C DRAINAGE 17103 125TH AVE SE G0770NWOOD TREE ADJ TO STOAM PIP 656F7 1997-1316 WQR SPILL 12700 SE 172ND ST �,,g� 1997-1�+77 W�A DUMPING 116XX PEl'ROVITSKY RD DRAINING OF SWIMMING POOL;HEALTH 656E7 1998-0052 C DRAINAGE 1�120 125TH AVE SE WATER PONDING ON PROP TECH ASST R 656F7 1998-0421 FCR �EBRIS i7611 114TH P� SE GaRBAGE�UMPED IN RN TRACs 65sE7 1998-0489 C pFiA1NAGE 17321 125TH AVE SE WATER PONDING WITHIN RD R/W 656F7 1998-0543 C �RAINAGE 17232 116TH AVE SE UNCONTROLL�D FLOW FROM PARKING L 656E7 1989-0329 �CR BAMBOO 12317 SE 179TN PL NON NATNE GROWTH IN R/D FACILITY 686F1 Y 1999-Q363 W�C MUD/SILT 112TH SE 17E'TH ST CONST ACTIVITY CAUSE MUD/DIRT ON R 656E7 1999-0384 C DRAIfVAGE 17832 114TH PL SE FLOW FROM ApJ PFIOP ONTO COMPI. 656E7 1999-Od66 C FILL 12420 PETROVITSKY RD FILL ACTIVI7Y ON ADJ PROP IMP FLOW DI 656F7 1999-0608 C FLOODING 17307 117TH AY� SE ROAD RUNOFF CAUSING FLOOD(NG 656E7 �57 C FLOODING 17314 1187H AVE $E ROADS CAUSING FLOODING SEE99-0608 656E7 =�383 C DRAINAGE 17300 116TFi AVE SE SEDIMENT IMPACT TO ORAINAGE CHANN 656E7 2000-0363 R DHAINAGE 17300 116T1-I AVE SE S�DIMENT IMPACT TO DRAINAGE CHANN 656E7 2001-0014 C DDM 12207 SE 1721VD ST REQLf�ST FaR CLEANING OF DRAINGE C 856F7 ,_�; 2001-0014 NDA- DDM 12207 3E 172ND�ST REQUEST FOR CLEANING O�DRAINGE C 656F7 2001-0014 Fi DOM 12207 SE 172Np ST REQU�ST�FOR CL.EANING OF DRAINGE C 656F7 20ot-0109 C DDM 12510 SE PETROVISKY APPAREIVT FILLIN�AND DRAINAGE ACTI 656F7 2001-0117 C DDM 12308 SE PEfROVISKY RD DUMPING OF YARD WASTE AND CHANNE 656F7 2001-0190 FCR MMA 114TH P SE &PETROVITSKY RD CONCERN REGARDING POND SITE COND 656E7 2001-0247 FCR MMA 12317 SE 179TH PL ID�NTIFIED NOXIOUS WEEDS. BLACKBE 686F1 '�- 2001-0322 WOC WQO 11631 SE 184TH S7 APPAREN7 GR�Y WATER DISCHARGE IN 686E1 2001-0322 WQR WQO 11631 SE 184T}i S7 APPAAENT GREY WATER DISCHARGE IN 886E1 2001-0382 C DDM 16924--1 125TH PL $E ROADS INDICATED PIPE SEPARATION OF 656F7 2001-0382 R DDM 16924-1 125TN PL SE ROADS INDICATED PIP�SEPARATION OF 656F7 2001-0389 WQC WQ! SE 1807 &118TM AVE S� POTENTIAL GRAY WATER DISCHARGE. C 686Et 2001-0389 WaE W�I SE 180T 8�118TH AV� SE POTENTIAL GRAY WATER DISCHARGE. C 686E1 20�1-0389 W�R WQI 5E 180T &118TH AVE S� POTENTIAL GRAY WAT�R DISCHARGE. C 686E1 2001-0684 C MNM 12301 S� 172ND 8T ALAN WORKING ON PROpOSED DRAINAG 656F7 2001-0726 C DDM 12215 SE 172ND ST THIS FROBLEM IS ALREADY 6EING ADDR 656F7 ,_} 2001-0742 FCC MMF 11802 SE PETROVISKY RD APpEARS PONDING PROBLEMIS IN R/D F 656E7 �C"- Page 3 Of 4 IyIH Y tt �� :b�NM KC I.�RD NO.616 P.Si5 CarpPlatnt Ty� �af Rrnblem Addres�of Pr�eru�: Ca�ieat9 = ibrae PaOB "�t�r C�e _ ,,314 C DpM 18524 114TH AVE SE SHE�TFLOW ONTO PROPERTY FROM UP 686E1 2002-0359 FCG MNM 17405 116TN AVE SE CLEARING ACTIVITY ALbNG STREAM GH 656E7 2002-0381 C DDM 11B25 SF 184TH ST SOGGY AREA IN YARD, MAY BE THE RES 6B6E1 2002-Qa07 WOC W�B 16836 1137H AVE $� EXTENSfON(WIpENING) OF EXtSTING D/ G56E7 2002-0535 FCR MNW 17602 114TI-i PL SE REPORTED INFESTA710N OF TANSY RAG 656E7 2002-0614 WaC WQD SE 175T &120TH AVE SE DISCiiARE OF CARPET CLEANING LIQUID 656F7 2002-oB14 WQE WQD S� 175T &1207H AVE SE DISCHARE OF CARPET CLEAN(NG LIQUID 656F7 2002-0774 C DYA 17�05 116TH AVE SE 656E7 2003-0030 FCC MNM 17425 119TH LN SE CHANNEL RESTRICTION AT TRASH RACK 656E7 2003-0201 FI REM 12B32 SE PETROVISKY 656F7 2Q03-0218 WQA WOAI 11802 SE PETROVISKY RD 656E7 �r-� -- 2003-0219 WQA WOA) 17445 11S�H AVE SE 656E7 `i.�_ _ .'�l�%1a . �'t�s . . . _ . .. e�ti+"V.i=.. � T� c+^ _ " I I .. Page s of 4 r'wr.14.2�03 2:49PM KC WLRD N0.713 P.12� � /lO �l Kin�.Countv Water and Land Resot�rces (WY.R nivision � 201 S J'acicson S�Suite 600 Seattle,'WA 9810a-3855 � �,�J n �� Date: "7 C/ � «E CO Number of pages including cover sheet: � To:� 00 �D.� �� . From: Candi McIz.ay, En�Tech.T� ��: �� ! 8�g� _ 'WLR Stormwater Services Section Phane: 20b 296-�900 Phone: (^� . . � . � Fax Number: 20 296-0192 j �9�?-0��3 ;s a�;�d Da u u��f �� fo c�o�� /lOt l � /°N�ro /�,s�c� �,�' . � � /P�3- oo�a ,s �.ss�ny Q c,�er i7�, RE: Level l� Analvsis '�o follow is a list o�camplai�s recei'ved by the Water and T.and R$sources Division Stormwater . Services Section. Complaint numbers begimung prior to 1990-XX�X hav+e been arehived and are no longer in our possession. They can st�l be retrieved,if necessary,but will take additional time and may not be beneficial to your researeh due to their age,development vvhich has oceurred,etc. Yf you are interested in reviewing the actual complaints, they can be puUed(time permitting) for your revie�vv. Copies can be obtained for$.l S per page,and$2.O�.per page for plans. Kevs: 'IWoe oi Yavestt�l3on 7Wae of�obfe�+ ' C Action Request . _ DC-A Dev�elopmenthConawction BCW Bcesimes'for Clcan Weter DDM -.�;:Ihainage-�eoua CCF Respa�e zo In9oir'9 DES ::�:'AauuB'e—&osion/3cd�attation •CL Qaim DL8 Aminege—I.andslidc/�ar�h Movemant Bii Enforoemait on Flold INQ Dr+mab�e—c3eaaal lnquiiy ER Paforco�riwt Revicw MMA Mamtcnence-Acsthetics S1,32,SN3 Eaginaring Slu�es MN1F Msirt�e�ce-Floodin8 FCC,FCI�FCS Facility Canpinints MMC Mninte�ance-denonl RR Fsc7iry Engieeaing Rcview I��R�Qvt Maiatr,�ao�e-A4ow�aE +LS I.�awoit MNM M�u�tenaooe—Needs Maiatmanct NnA Nei�boriwod Iksinage Aa�istanee SWF SWM FceQnastiorm WQC Wata Qaaliry Complalat WQB W�ner Quait,y—Best Mimngama�t Prsctias WQ� Wetu QanlitY Anforcanw'�t WQD Waper Qnelity—Dm�ing WQA � Water Quslit7 Hnginarin8 R,�nea' WQI Wamr Quality—�llioit Ccaineotion WQA Watu Qw[ity Andit � WQO Water Quality--Other sSubject tn Pub6e Discloanm�riarm�te 1.Rooci�t ef wriqai reqocst for do�vmatts 2.Rev'�ew�d approval by P�oeteuting Attane�t offia � MAY. 14.2�03K.z_50Pt�QUKC WLRD)tNAf-►I M�N I UF-"t�t�t.i�LIL WUtitt:N0.713 P.Ziz3 �J SURFACE WATER MANAGEMENT QtViSION � � � COMPLAINT INV�STIGATiaN REP4R� �Ro _ . � - o t � Date Rec�a: ` � t OF COMPLAINT: �� SEC�11AIPo�qG� � _OCATION: KROLL PG. /p�.� . �OMP�INANT: COUNCIL DIST. �� PMONE NO. Address a —� 5� f,�� ty 5tate�Zip �i�� HOME _�c��'7S�S�U WORK �� )ETAILS OF COMPLAINT: � �� /�� s . - � . �� "� � � � � � �� o° �� ;u�ro �x�r � ��- �� . . �� u� �� o Q- � � �� . �� , ��c�in �-{-�-?` . C � '��`�"�� G�a��-o�''`�c.�'4 , � 7 �� • �'�D�a2`'� �r�c vf�o �,��G%� . � , . C�t-��- , (/ �� , � LAINT R�CENED BY: � 7F``I[��OF {NVES71GqT10N: Sketch on reverse side:Yes�' No D Photos:Yes((y No O a u�r _.�t� ��o-9i, The Lattanzio property 1s r�1atiVely leYe1 , H�1th a Slqpe frOm �lest tp eas�t, �owards tlle road South of �he Lattanzio lot the roadslde d�t�h slopes ta the north, The l,dttanzio property and �he neighbor to the north do not have a ditch.�o tF�e north of the net�9hbor the ditch resumes. Run off is said to pond around La�fianzio•s mailbox (photo 2) and eYentuallY �'low across the road to the neighbors on the east. The road is county maintained and is a shoulder type road. Photo 1) Looks north on 12�th. Lattanzio's property starts clase to the pole at left. 2) Sam tattanzio's house is in foreground. 3) Looks south on 124th with Lattanzio's property cTeared a� right. 4) Oposite side of road where run off is said to flow. Pile of leaves at mail box is said to have originated at Lattanzio's. ?Z 8"`9/ - b,-�c.�s s� �..� �o.5F 1� �p/z �i,�H—,raN , �J c�Q G..`�G '�J ,�'o s�o f ��1 � �q -r-Tiq�/z� a is i.�. _.4� �..1 s�� i ��a0�.�-� Fi�� . •�o��s �i�L �/oT 7�,�H. .. AMFLAINT 1NVESTIGATED BY: � J � �r�/9-�� DATE: L �1 � �CT10N TAKEN: i_��r9/ /U�tY �/`g �.�'/ ,� �S5'� , �� '" �� , � 1 �� G`S ��yj �� "� �, � /��'� 9�-�� I� i.� �i�crr/9�' 7 ��T� v��="� G��w�� i�� Y � �.��'`�� d�3�n � T �POf. :,c �ant advlsed of act)on poss(ble or taken bY one�J tette Pe nal Contact ❑ � � �R f ;om��i ;� ' � QY ' ��: 6 - �'''�/ otc� : '�r �4i a�mt • . . Q�IA .i' n�4M'� . �Mi{.Kb'�52�rj� Y�wa�S/WK.�.�.�•p4r��'•I►'�' R�vl� � •.. ' �• ,•^ .�, � • ... .. . . ' i �.L:'. .-: • ._ . �--..�..r...w .�.. �r.. ... . . ..rw..«r�r.�..�.�.r h�Y.14.zEj03 2=5aPM KC WLRD � N0.713 P.3i23 4 S�etC�l ,�`�� S� N ' ii f2`�� 3 � , --"� � . ��-7 1$201 =. scale N J n� '. ,. _� . � - -ti ..--> _' L� \� ��j � � � �aZr� i �' ; � �g-fgn�o —'`.� ,�' .. �7 . �f � I � r � � I . .�L 1 , �P � � I � I 1 I � � � . _� � 3.41 AC. .�. � � , �, MAY. 14.2F903 �ry�COVi�iiR�URFACE � MANAGEMENT DiV{SI("o�?I3 P.7i2� � . DRAINAG� rNVEST�GATrQI�� REPOR'I' � � Pa9e �: INVESTIGATION REQUEST T�PE �QC•.,-• � PROBLEM Qj � (� --- P- -�Ned by: ' Date: �/3�9� OK'd by. Flle No. �3 • p338 _ � f---- �Bd from: I%Y%l��c..�j' ��.I/n �l-, �p��ior�r+ninp). (�Y) i�p) � c./ tdAME: o..��-� '�, /`�`.U� //<Q1�Z ~�/��T PHONE o'�� `��Q ADDRESS: ��DOO �� 7�0(/i ��T �� s�ce G� vp l..ocation of problem, If differenL ��r_ , ,,,�„�f �� CHARGE � . ��C,L,(J Defails of Prab/am: D%/ �� i�``��-`,�� ,c�� _ r� ��o� ��=�_.:= . _-:,::._ _ � �� . � .£.� other, agencies _ invo].ved: (Give d�tails) - Reported Impacis: # Properties: � Dates/freguenc3�•=:of occwrrences: Home Access road � Septic system _ outbuildings, garage ` Xard/Zandscaping _ Other pro�erty Stream, lake, wetland . _ Cvrr�menfs: . ... .--•--...-- .....-------....... .... .... - - - �• - -- �. ....... . . . .. .. .. ��,�t �►�. .L-b p � v. ..��,;��,�.,� ,k• ,:.,. Lac�Lon/Tra�ing /nfo: 1/d S T R Parcel Nc,. 7YDe�� Basin CouncU Dlst DlR ReffChg No: City Fleld investigation needed? Plat name: Block No: Lot No: ' � takB�: Rssigned to: Tumed to on_/ / initials; KRQL'L � . �nv�..•S BRQS '�J�� . DA'T� C�OSED'�� OK'd: �� - . .. . . __ • - OLD: . �� 1�� . � ._� ��T• I4•��e3 2=51PM KC WLRD N0.713 P.Ei2� oL� � � �x,�t�AC�E Il�l� S�� TION �PORT - Page 2: FlEI� INVESTfGATlON TYPE �Q �ile Name:, ' � _ � ' � Fle No. �.��38 Derails vf lnvesti9ation: Date of Fleld Investigation:�f� 9 Related Ir�vestlgatinns: �.e d-�� r��'e�'��d � � �'�m��a•�I`� . �s a C�U� ' S � �Q�v� c�h �� y�s��. .L'� ��o� �O v�o�i .�-.-.x..-��._.,��.��;,�,o��--.-��-��-�.�-�.G��.��_� _. �llc�l�n�- �� S�z� ��n� d�a��.�.s��. �=- su� s�� iDml/ �� -- ��`�� Q�� Zj (�D L�i�'�G� _ W�l >��`�� Q CJC��J O! � - �'C'� ��r� ��- ��s � �'�,v�-r�- �� . �'�� '� . �� s L�a� � ��D �� i�s�� ` � '� . y� �u 6a�� . C''!�- � � _ Sketch: � , d 6,� � � � . � ., . \ �_ / -�- � - . �ao� �.� �-5. oa�e �R�o�� .?�0�93 �y: _ -.5� �'11Q. ��I�e_ . Complainant noti�ed by by_phone�letter.�('persoriat contact. � � ivn-Gim . _ _ _ _ _ MHY. ia.z�e3 z:s2P�Kc„wu�DSURFACE WATER Ni�$EMENT DIVIS�O►�13 P.9'2�,. � DRA�CNAGE IN�V'ESTIGATION �PORT � Page t: lNVESTIGATlON REQUEST TYQ�. � PROBLEM (�m�'}y�rii -�'� -_ _� Received by, L. . G�� . Date: -? � ,p,� OK'd by: FUe No. �� '�� ed frOm: M e•�� (P1e�se priM pfainly 1w arBnninB�• N�Y) (Ev�) N �W� ' � WAME: c�17T1rC,l� pHONE ADDRESS: � IGi�4 _�3G PC-�'O►JitG(cJl) (� Ciry State Zip Location ot pr�blern, if different � _ - � � � CNARGE � . Data�7s of Piob/em: ' � ' CGt.f' i�t1��t�lir�t9 -Fc�tC'a ( i�-i� Gi�1��l�t'�� -i� ��f�n�1 �'�'�'�-R'� ��CG• GI'tfiolC-f/tCG� � ��-1t 1�� 2Y1�C-�"-� _ �• e13 _ ('� �%, Z . ��f� � •- • Other.ageneies._involved: _ (Gj.ve, .details) � Reported fmpacts: #Properties: Dates/frequency of occurrences: Hone � • Access road " Septic systezn � � Outbuildings, garage � _ Yaxd/landscaping ' � Other property _ Stream, la]ce, w�tland . . Comments; . •----.__ ....,-•��----------------------- -.._......... .. �,'4� +�� *R� y - � ' '' ' ''Y'�"""»"r'��i{ii:�s:'r:� :..r.,, 'f ;T f !a�':,ia�S%� Lotatior!/T��cking /nfa: 1/4 S T R ParCel No. 7ype Basin � CouncD Dist D1R Ref/Chg No: City Field investigat(on needed? Plat�ame: Block No: Lot No: .�-yaio taken: Assigneci to: Yumed to on�� Initials: KRQ'LL .. . . . T - gRp5 -NEW: • '_. .-- DATE CLOSED: rl �..-.__i�,� OK'd: __�� ._ _�!"- OL'D: • ' / ��Q�� r,� .�-,.crxia c•�crri K� wLrct� -- � � .� �� N0.713 P.lOiZ; _ � � • � �� • DRAINAGE I]�EST7C7ATIOI� REPORT - • Page 2: FIELD INVESTIGATION TYPE ��'�� Flle Name: �� _ F'i1e No. G�'3_��DC�SI Detafls of/nvestigation: ate ot Fleld I�vestigation:�J�/� Reiated Investfgations: j � 1� wj '�� .me C�� x�x�od �13e.� w��evt-� fV�o.,v�r�.�r, � � �c� W ��r �-"� .�� (.J�` .� � � �C�� L S �,o 1�� e� �� 1 ----•.,,.-„.<- .-_.,-.t-�:.__�-_.�.._,. .. ' � � • �RC�V'l�CS �� ('�e~. -� T �Ly�Qt��/l��C�.�`� ��CJ� � �S ^��`°'�s''- '_� r � _ , � � �X. � � -� �'\e�� oWi�g �t2� ��Ul'� � � r� ; -i � � � - �� wcpx�.� c��d ��vv� �L ��-- _� 0��-- ��{- C.1.ecLru� � 'P �� - - Cj,�l� OLSUeVY�Q�. QOl I�� '�� l (�G�I � �4L� � �� `'� � �Ctn-,, ; �� S� . J�"Q �CS► `�� pU� 't�"� �CS� �� , ! , �� t � � vvt�ina�. � i O� - J��b C� �a� � �� - �AC a,,t `�-� �,�.ctiSS O��✓e� Y��e.� . '� `�-�� 5 I� �-- `� - � /)�� ' � � e � `'�Y f�} �(1� �, l�� 1� d �o pal`v�.�� w+�l �.��- . � "� � u� ,+ Sketch: ` {�lso �`�`5 ��re �ee� G�ea��fi � o�-� �.� r��sfec�, RE i� ,��1� c�� p� z.g, ta.�3 � . .. . .... .. � _ S�e 0.��C��.�� v�vv�- C'-w� a`ke.-Ec_.Ir. • C--�vz�, Q�'� , — . ��' P�� t� � �t�'v'► 'r'�w�OtT�. - - . - . � w � � - � � L ._ � � ,. �:-�-� . ti Date of Report:�S f�3 ey. � _��,,,� Complainant notr�ied bY �C... �phone e, er perso�al contact. �. �co�t� of cov►1,��.w� MRY. 14.��3 z�52PM KC t�LRD NO.713 P.11 i2^' I _��. KING COUN'fY,,SI]S�►CE WATER MANAGEMEN7 DMSI�N r�l � �l�I i DRAINA,GE �TIG�.TION REPQIZT - �� Page 1: INVESTIGATION'REQUEST 7ype � � bY � � �ate: �z..��—�� o�ca �: D R-� �ua�No. 9��0�7�� - Received from: • (Piease prirrt p{�ly ior ocannln8). .. (DaY) (�"�0) NAME: /l(�hr'��'� / "'G C„ U lI O C�� l PHONE Z Z(� ��1�l� ADpRESS: f 1.g�� 'C� 7�� Jf City ��v'��r State Z.ip ��5� � i.ocation of probiern, ff diffareh� ' " • . Reported Problem: � r � . �;�<<„�1� `�`i'��,., - `t;�� r� Gb�ve�� ,�/o..y f�,��c �/��c�i'��'�� . wr5 G��.�: �<l�<i /v1r�`t�t:t1'. ��ii�c.PSLy/�i�.��•1 c.<<<.-� } _ ;,,�.._. v � i i! �''',D C . ��tti ! '7� !,S �iGl�! U� �-.� Ci r_r/' ��`�� /�J! � � ��(�� . • � �l: �� . . . / �� v U /��(�7 �� /�/ / r-' �t�� G!X!� �i�'�� _ � �larname: �or�y /f•Qsfe.�� G�r�lN� l�a�-s Q',.� ! Lot No: � Block No: � �ther agen�les Invatved: No.fleld IrnestlgaUon Needed - �: pr�ttta�a) ;` � — .�, .il`l�'.�k:IF�:�c3�1� ::;,ry:;`::;; �,t W '3 3 2 3 � Parcel Na �� 6 6 b �t�S�3 � KraM G v s l� Th.Bros: New IOcQ� �� 7/4 S T R ' ' • Old „ , � ' y�/�'% Baskn J�� CauncQ D(st� Charge 1�l0: � ESPONS� Cktzen not�if'ied on !-6'y(o by k phone,_, lettsr _in person CAc��-e ►��v L.�=Fr �tSSAe6.� �S-�:�.��. c.-�. �..�� .. S,`l� C_-��. . _. V ' � �SPOSIT/ON: Tumed to � 'On /�.2 7— � by__1�� OR: No furthe�actlon recommended because: L-eac! agency has been notified_ ,Probiem has been cotrected. ,�No_problem has been identffted. . Prtor Irrvestlgation addresses problem: - : ._ .see F1e# �rnrafe problerri- NDAP wll!no[corrs/der because: _ Water origlnates ons�e and/or on neighborirrg parcet ,_Rocatl�n ts outside SvVM Service Area. . _Other(Specffy): �a� cc.os��:_� 7 _l� by: n�/ � ��,,�� `�` MAY. 14.2�03 2=52PM KC kLFlll NO.�t1� P.12/2�: lanq Count�r .. __ �'FII E NO. � --.. 8urfac• Water �� Managem�nt N� R09�pT �MCCULLOUaH �,..• � �� nnDxsss ��a2a - s� 18oTH ST PHONE x28-2191,_,_ ,Tg pAGB 686-E1 DRAINAGE INVESTICaAT10N REPORT �o�pAc� _�osw FIELD INVESTIGATION DA� '2-2Q-sg Mn� niviszoz� a INTrL�T.S- MAM DETAILS OF INVHSTIGATION: , SITE VISIT ON 12-2496. DFiAiNAGt ALONO AACK �� pROPeRTY CONVEYED TNpGUQH PIPE FLOODING YARD. -r iNVE$71QATICN F��ND DRAlNAG!�RORI 8!1eoTH sT OU7'LET ONTO 11s06•SE 7a0TH B7 �AAfNAG� IS IN A ry oPEN cHANN�L POR neouT 20'TMeN CONVEYED?HRouGH A 12•PIP�WHICH AUNg NOHTHEAST TO 1162E -BE 'teOST . ST WHER� IT oUri.ers. Ir naPeARe Pu�TO TH�AMouN7 0�ve�eTA71aN AND MATERIaI wHlcrr„as ev11.T up THE FL4WS AR� B�IN� olvemto AcAoas THE PAOPERTY�T 11e2e .6E 1eoTH BT. IN TALKING WITt1 THII PRopERTY OWHER IT WAs MeNrroNeo ir 7He cHAIVHEI Was c�EnReo �tows wou�.p NOT FLOOD H�s PROPearY.wN��E LpoKtNG AT THE 1'LOODING A BMeI.L�F SEWAGL WAs DL'TlCTlD.THE PROpERTY OWNEp/IY 11E2a THOUGHT THE HoUSE AT 1160s -sE 780TH ST YfOHT HAVE A pqoBLEM NI1Tf1 THElR DRAIN FIE�.D. � PNOTOB TAKEN •1 SHOWING OUTLlT PIPE ON PROp�RTY AT 11E4s - SG 1a0TH 9T AND FLO�bING YARD. �r 2 �ApINAw�cH�wHe�aN� vlpE�N�T oN pqvpearr AT 1�ao6��e_�eotH sT. {y � - $KPTC�T: IJt - N W � . _ ar.- . . ,.:�, .. _ .. Xil•Y � -..� . � � � - ::. .... .:.:.: T .::��i::ri::t:3�3??.::;:.:i r � �r�� p�000ED aR�► � � � NouaE ►iouse Hnus� � �tsoe »ean neze � i n DRAIN RRD �` SE -180TH ST • .. � - • � - � � I'IHT. 14.C�.� G=J.�F''I'1 Kl. WLKL NO.713 F'. LJ�LJ "�-':�.�'=ns�,un a8gu� � � -��d'o .-------�.. .,...�.,.,...a,�.�.,i.►+,y�aiuuvuaJi dtTTQT.173OP PITY?�H��AAI�tAd jTC(n IIOn2� b.r�lEn��0�8''��I� d sP�x os��noa�f�tsaq�stt Brn�ulo�urrtq�t d�q sm'ale-� `sm�T4�d�P�s�no�. ' ��: �� t4 P� ��P=od 3?�vo�Y ap�d•o1 sr sxnw�as s,(y�S)�n�ma8�uryY i��QM?��Gano��ur}T��a �'_ �_�.. ,�r:_�:• ..�. .�:_: . �� _ . :�:;: -�.: :�,�.�:,"x-:�,-: ;.,: ,...:;_.,,�. . _ _ � O �� _ ''lEQ • ' ' . . '��.'.•Yi _�;-.�,... .:,,o:'.�:'1'':.• :'_..' •cL ;r_�.�:'r.J 4a..' r .T .. .. - -- - ' "� -:�"-- T _ .:�;•� -_ ' _`z/ , j�At��Q� Datc: Febrvary 6,1997 Date of Invc�ig�►tion: Febroary 5,1497 FM: (3ary Panl Reinkc R�:NDAP b.`valuation for Compla�t�f 96-2071 Robert Mc�llough 11828 SE 180'�Strxt Renton,WA. 98058 226-2191 Buck�onnQ Mr.McCtillough has private drainage flowittg through his back yst'd The pipe tuns fmm the S W to the NE an$pasaes under the inteisection of 118�'and 180�. The.ne is no reoord of th�drainage ayscem Findin� I met'with Mr.Mc��Ilough on sits and it b0si�cally came dovyn to offering soina TA. He bas 2lready placed soma ooncreete tilc to extend,�he flow through tlu corner of his lot btrt somo of the pipe has sepa�ated. T�om is a slough behind the Lause aad ic wanld tak+c abaut ao-50 ftet of].�"plastic pipe ta convey the water to the slough. I§u�sted he clear a path for thc pipe at this time of yeat bafor�the bush foIiage builds up. He agrted to thc idea and I closed the c;amplaint on site. � Impact Scare-N/A i Optione and Discassion • Flooding or erosion-No • Affects mainly plitvau P�P�Y-Y� • Caused by more tban one a�joining si�le family pa�+cel or not g code violation -Yes�No • Caused by laior upsh�eam development - No pro ased Solation Technical Assistance provided .,. - .. . . '�;;..,._ .: . .. . ' . . -:y� �.� _ Priority Score=N!A - . MHY.14.��fb� C�5�F'P"11r1a�1KC, w�KDy WA1�K A�ID L�AND 1tF,SOURCY�.S DIVL.�.713 • P.14/2 . � w�`� D1tA,INAGE INVESTIGATIOl'�T REPORT �G�� Pagc 1: II�rvFstic�►TiON RFQU�sT �e �� P1ZOBY.F.M; BY- • �� R�a b - � -�o eceived fivin: � - � ��- ' (D�) �r°�-, (�) i.�� N,v�: Pxor� "Z ADDxFss: � City State Zip 7.ocation ofprobleu� ifdifferent; l�3/'J �'� ��'9(.�V 1Q� Reported,�i�oblem: CALL FmST � (Would L�7ce To Bo�resent) , ��1.�o r� ' �7`z��a /�'�.�� G�,��in.Q - � � �.��?�0 , . /�?D� � � ,O9/� �'02 ��'�- :" . . � �name: _._ _ � �q ' -- --Lot No: B1ock No: // vther agencses involvcd: No fie�d investigation required (initisis it/l.�J �,.� �.� r - 1/a S . T R Parcrl No.�7'�.�D�JCo�Rroll �� Th.Bros: Ncw � �� Old �--2.�j�- Basin_�, � Cotmcil District 9 Charge No. R�sPolvs� Citize�notified on s—i2 —!� by: � phone letter in person • ��l Citi at�v k•e.ie w L�o,4K I�fl�o�ei 2a-Tiav lS /�,��I��x t�-�0 ra ��vF �3��0 ��a��. �'� o9r-v T �/� ��` �v/N32S. :.�� DLSPOSITION: T}umed to on / / -by OR' No�fiuther action recommended because; �7 Lead agency has bcen notified: �Q�s l�h-,� S'��/�'L l�PS , - ' Yroblcm has been cornected � No probiem has becn identified. Prior mvestigatio�addrr�ses problem: � �� . Private problein-NAAP w�l not consider because: � 'Water originate�onsite and/or on n�ighboring parcel. • � . � , T.�cation is a�side W�.1tD Sexvi ,. � . . Other(SPeafy'): . � . LA 4I.OS�A:. � ,-� ` By: � . � �. � LT' , � _ L• .1 ' . ��f�1�•M,yy`!�. �.� .�.� . �.. . . � a�1:'�• .. . �. . .� . ,•""" . ' � � . . � ,�7•j . � � . . . . '�,!�. •. ,1.. ' . . - ' �. . ' � � . � _ • • --._...�.,:.:......u�.::..::�.s.-,..., _-.�..,. _ti.i,t.r._..k�...�'.._��..,,s..v.-• . .n�'v/- ...i. _.�.. . � .. ... , r.� . . , . . __.� -_-- - .- _ �YV. !1J �.1.��L,> . -----i'IH T.14.C�]47� C=�:�'1"1 Kl: WLKll _. t �'� ��i ` _ y+�i�i��l ''�,1�� ----- - - - • . �� - - � ��[NG COVNz-Y . �No 99-032� _– Dep�rttnant of Natural RosoUrces N'�ME MNc HAWKINS �� Wator and Land Resource Division ADDRESS �epos - 124TW AVE SE ' PXTONE (425)228-7236 'rg PAGE 688-F1 �pRAiNAGE INVESTIGATION REPORT �pY,L PACrL' so�w � ' F1ELD INVESTIGATION DATE a-z7-ss f - . MAINT: DTVISION a I.*1ITiALS -MAM , � DETAYLS OF INVHSTTGATIOI�: ' ,_ SITE VISfT ON s-27-99. BAllIB00 FROIr! R/D FACILITY D�1979 INVADINQ YAflD. ' INVESTIQATI�N FOl1ND THE R/D FACII.ITY b91672 AT HIDDEN CEDApS HAS BAMBOO SHO�TS GFiOWING AROUND 7HE N coHTROI STRUC7uRE Al+io INV�pING UMDeR FENCE To NE�otiBoqlNG YARD. nUE To THe LOCaTION oF 7ME BAMeoo AROUND Tli� CONTAot, S7RUG7uRE IT SHOULD BE R�MOVED TO ALLOW FOR SAFE INSPECTIONS. r;T� PHO7os TAKEN �R t SHOWING BAM800 SHO�TS AHOUND CON7HpL STRUCTURE. � 2 SHOWIN[� 6AMB00 INVADING INTO N�IGHBqRIN6 PRoPERtY. - _ -.. -- I 1 SE 179TH PL CB-3 +►a ' '�a. I �yA I � ( TRASH RACK I HOU6E � . i 12�13 RIPRAP PAD � II � I • SKET . i � I �� : ' N� I �_ � � -'� � s � �r ,_ TRACT A ` ` '�` . (� WET POND � I � � � � . � � .aaa��aa�c.� � � iiiPRAP PAD 8P.ILLWJR7 ( 1 I TPA9N AACK q�PRAP PAD S WO DEN BOL.LARDS I � �P ' �,.e �asH pacK �';� I CB-4 � s` _____—� �'ya .) � CS/C�•t � � 2i'-+s•cMc CB-2 ,_, � _ � THAC7 BOUNWIAV x-X x--X-x-?�-•x-?[�-..X-x-X-�x-X--x-K�t-X�x-x-x-k-x-�x-?t-x�-x 6'WOODEN PE710E � . a Houss �eooe i`W T.14.G�JN.� C='.�FT7 Kl- l"1-K11 �`I�. T 13 P.16i2� �� _ . _ . . � r - . . . . . -A i nt - .. . � ::T:.h`. ._ . intenan[e D:�isiont 4 Thomas Bros l;ap: 666r1 tlA t W14az5 F�tility x: �9167� iype: tlet ac�d H�dden CedarS Div IT Street �ddress: 123i7 8E 179th Pl Di�ecticn5: FROM SE 192 GT & 11� AVE SE HEAA NORTH TO SE 184 ST THEN HEAD E1ST TO 124 AV� SE 7HEN NORTH 70 SE 179 PL. POND �S ON TH� L�FT, Chec�ed on 5/01/94 hy Michael A Mal�etich �tif�jt/( RaCio E: 512 Charge to Arnje�t s: Da�475 Fisheries: N 5pe�ial EquiF�2nt: . YLRD NateS/Comr.ents: � Nate; The ne:��bor is eaoplalning ba�ban :roa.County R/D farility is irtvading h"i5�`pf9perty, Baehoo ropt� �eeds to he re�oved froa �rour,� cartral stru[ture and fence area. ��'=• ',:;;�o•:�_ _. . i �oad5 Div, Nates: �:r.� a Date Attual Material t4ater;al �lype ;;:,its NarR Requesied � Caapleted lJriis Ir►it °la�ed fxcavaied r24 IEa.Fac. 1-1Perfo:� :he follaving �aictenante/:epzir aorf�: haobao � I Jar�lnd contro! stru�ture neede to �e reoaved. need , � �tereaove rock inordar to dig out roats.� �refb6al L_. �_ ; � - Wo- Au+horzz�d: Date: Work. Cdr*i;�let�cl : Date: '_��er Versia�: FBhClld_y 22, i993 , � - ---- .. _ . r�Hr.i n.��e.� �=�rr'�lU�K� w�Klx �'V AJ:1':K A1vL 1�AND 10EM1SOURG�'.S�NIS�.�;r i��t - . 1 ;L_ �� ' o- "� � D�2A�i1TAGE�II�NESTIGA�"�ON REPORT t � �� • , � . . . . -_ .- - . n�v�snoA�rorr�ussr � PROBT,EM' .,, �'p� ' �.. J �I. •� '^ENED BY: ate: K'd b : ��Fn.E o. Z�Q — ,� iZeceived from: , _ _ �- - - � - -- - _ ... • 1•f1.1',��9��;�i�'✓J .... . .. . - ---� (Da�,) -- -�� s� ,..,,3 NAME: PHON� �(�� — �,23(0 ADDRESS� ��rx��' ��y'`h (�_ S�c�ri s�� z��`os� I,OCATION Of PROBLEM, !F DT�EEZENT: �7 •F,•,� L Access Permissinn Granted Ca1[I+7�Pst ('W'ou(d Like To Be Presant) � f� . �G�,''', � . �'�� . . - � , � 0'3'� {�'1lL • • ,� � � _• . . c, ` J�� •'"'. � 1 1 , . � . ,�� :.- , . � , � . . _ -. � �;�-r=;�., b �, ,`� ��-�- j �:��. . � ` � .� :� � ,E,�.. o� .. � �t�`�� . Ur� � t� Z� • . . �a ,,��,,�,� L.,� � Plat name: � �� ,��,� +�'�'r ' �� q.pfi� �► T.,ot No: Block No: Othez agencies involved: I�To�ield investigation required ).� °��:;�t�'a'� ,� � .•,�. . �H..u :. I � � � � . � — / S T R Parcel'No,,�7 �5 D�i�b Kroll� Th.Bros: New Basin�^, Council Dist�ict� Chaige No, . .-�� R�SPONSE: Citizen notified on ��O y—D/, � by; _� phone � letter in persun . -.L�r e�Ti Zz� k�ow k �,u/� w�s ��t..�,�R�� To� {�i�vr- ��k��,�s 1�yV,¢=�f�qP�91�/�5��;/!/DrdtaL��p ,�?�s.�o�� . , - , � : ��4�� T� �,1�_ �� uJ!(P,�5$ . . . . - ; .. DCSPOSITION: :' Turnod t�o� ' � on � / / by . OR No further action recommanded because: ��Lead.�aganoy ha�been noti�iez�;�Q�'iDS "��/ieJT^• ��is'Z//�'� �QI�s � �' - � Prolilem�has been correct,ed. � •No.proble�n[ias.been identified,. '�P�iQr i�ve�gabo�.addresses problcm; —� . ' . . . - 4 ' ; ,r� :i`�'�` EE � , . i • _ �y .s .r �?. "-'•• ` ' �* .f �—��-- • �' '�iQ ; , .i. ` :•V — .� „�a�, i'IHT. 14.Gr�'UJ c-�vrri n�. t�rc1� �yv. r1� h'. lY�/C� � - � KINC COUNTY �'°-�N°. 0�-02�7 FCR O N� MAX HAWKINS � Department of Natural Resvurccs aDDRass iaoos - 124TH �v� sE Water and Land qesvurce blvlslon pHONE (4251226-723G 'I'� pAG.$ sss-F� KROLL PAGE BOS DATE 5-02-01 DRAINA�E INVESTIGATiON REPORT �T DIVISION 4 FIELD INVESTICA710N INTTI�I-S-MAM DETA.I�,S OF INVL'STIC�A�'iON: ' SITE VISIT ON �i-27•o1. BAMBoo AND BLACKBEARIES ENCROACHIN�s FROM R/O FACILITY. INVESTIGATIoN FOUNP THE R1D pqCILITY D�1A72 AT H1dD�N CEDARS HA3 JAPAN83E KNOTW��D GRoWINQ AROUND N CON7ROL 3TRUCTt1RE AND ON ACCESS ROAD. BLACK6ERRIEs ARE QROWING if�THE SOUTHWEST CORNER ANo AR� ENCqoACHING ON NEIGHBOR'g PROP�pTY. A WORK Al1THORI7AT10N I WOo00o HAS BE�N PREPARRU TO HAVE NTS BLACKBEARIES AND JAPANEsE I(NOTWFED REMoV�D FROM TH� SITE. PHOTO TAKEN� 1 SNOWING JApANESE KNOTWEED GROWINQ A7 p/�FACILITY D�1872. � � I � ♦ _;.... SE 179TH PL = , , � SKETCH: CB-3 - . . I W'�r. � . I � � TAASM McK ! NONEE ' RIpRAp pA0 ! �. 1Za�y I � ' j � � I i� � py W �� TRACT A `9'� I i� WET POND � � .. .,.: �: : � � :�c'cess•-A"vi►�: � � 9PILi . I I ' RIPRAY PAD ��Y� � I �� TRAEH RACK RIPAAV PAO - b WO D!N 80�{.qRDB � ' ° �� 6�g TRABM RACK �. �1 l ! , CB-4 � � ^� �`� CI'�h`�I�'•,� � —"'� � ,, i r��;!��i� JAPANESE KN I� Y�RRIES �lid �3 � ��'-,s�cMP CB-2 � i' ,� Teuc'r eouNwm – — — — a� J��t � I x=x x.—ii—k—x—t�—x—x=x—�oc=x��t—x-ac-�c=x—X=x-�=K=x=a�.-x=x=x • 0'WooDEN PYNCE - - — — i•iH� . iv.cr,�,� c-�4rri K� v�KL I`1u. ri� Y. 17iG� wat�� and Land Resoures Divisian fWLRp) Local Drainage services ,. - Residentfal R/D Work Autharizatio� � Complainti - . Mafntenance Division: 4 TAa�as Bras 11ap: fi�bFl YA t W162S8 Fuilit►r �: A91672 Typet Yet Pand Hiddea Cedars Div II Street Addre�s: 12317 5E 179�h pl Di.rectinns: FROM SE 19Z ST 8 ��.b AV� SE HEAD NORTH TO SE 184 ST THEN HEAD EAS7 TO ].2►+ AVE SE THEN NORTH TO SE 179 RL. POND IS QN THE LEFT. . ''Y•. CAecked nn 5/04/Q1 by �tithael A Malnerich�/f� ;' . Radio t: 512 Chatge to Project s: Qd1415 Fisheries: N Sppcial Equip�ent: � " ' YLAD Notes/Co�tents: Nute: Bla[kherries dnd Japanese knot�eed are encroa[hing into neigf�6or5 praperty to the sauth fro� are facility. Cut and reaove blackberries. The aapanese Inotveed needs to be dug up and re�oved. All Erag�entitiens cau3ed by diggiag up Japanese Rnot�eed ne�d to be pirked �p. This i5 �ainly hor the plant spreads. 8oads Dir. Mates: . � _ '�_ ,:- T�sk tlAit t - ' Date.�..�.�:>Ac�aal Ilaterial Katerial Cade Type Units Yurk Aequested Ca�pieted Units Init Pla�ed Exearated Y2k Ea.Fac. 1 rPer[or� the following ■ainten�nce/rep�ir rork: Re�ove 6iackberries and dap�rtese knotveed along the sauth Side aE � pond. ]apanese kontMeed neads to be aug up.. trefb601 Work Authorized: Date; Work Compl�ted : Date: PTo�ra� Version; Febru�ry 22, 1993 � .. a�ir.la.��.::: �;�r �.. �ru.t _ _ _ _ _ . , .:. �r+u. ri�:� -r.�e��_�„ . � . . '�� . �y G C"v ui��•: �Vx�''��:A.ND.�,AhT13��F,SQ�R��Q�7�.��i .�., f- , . -, . , _ . . . . . , . � � - � DRA.IN.iAGE INf VE,.��IGA��ON �P��t'�' : :�-- � - - - ,�, I — iriv��tc+wriorrx�Qvfis�,� = �, � � . _ .- :. �y�.�.� PROBLEM: , [A�!�_ , � . • . . • ' � � . '^(VED BY: (r_,�i+�OY] Date•�/�/�f CS/ O�C.'d by: �'II,E No. 2001 -�7�v� • j —�� Receir�ed froin: /� , . �gY) �1�w ) (E�e) �,� NAME: - PHONP _ o�3S '�ti�7 '/ A � !� ADDRESS: �7 � /v � �ity State Zip LOCAT70N OF PROBLEM, !F DIFFERENT: ' p r� Access Perm�ssior� Granled ❑ CaCI,Frrst (Would�,ike To se Presen ❑ � � � � � � . � . �� 5� G� - ��%u.�-- �,�� __ � C�� - - _ . . , - � : � �� -� � � � . . � , � � �q��GB' � Plat name; •�� . � . Lot No: Block No; Other agencies involved: ' . N'o field investigation required ~x%�:;;r:':r"�'�;;:��'1 '`' �� ` �•� , '.��,y;nM:,-;:.��,_,:: ~.5�.:r 1eAr "1 . ,.'f . �+1.:.�,�'!y.(h�yF�;,-��.'. � � � 1/a S T R Parcel No./�� ?�� . , Kroll ��Z�Bros: l�iew��i� RDP..�, Bas�iu� Counci�IDistrict, 9 . Charge No. - RF,SPONSB: - Citizen notified on '"'� _�y:,•��p ane � • leti�r in person - . - - . �� . �� ,� . � . .•.;��. . , . _ �-� . '� � � �II�* �'-b -� ' �� nYSI'OSITION: Tu�ned to � on � • / • / - by � ��Yt:� futther�action're mm��in ed b use: • � � i.ead:ag�ncy has tieen iiotYfied: , . . .' � ,�,' - - � i .•' , - . •.� • . ' .. .. . ��'. �� i� Q�1�A1` as b�en��orrectec�. � IVa piob e1n� �.��eg, ��ee�. � ' .��ior•inv�stigatiou addresse�problem. { _� . . • , _� � �'. J: -, � $' '�.;_ . .. ' ' . . '+' l O.�. � �� '{ I F iw. � i� . ." �� - - -- -('1HY.14.L�� C=5�F'f 1 - - Kl. WLKll .. � , I CONlPLAINT O1-0�42 ,7�1Y CARTER at CASCADfi PARK CONAOS D96368 11802 SF PETROVITSKY ROAD TS 656E7 - Investigated by A'GAN MLYERS I1-15-01 T toured the site about 1 PM the day after the heavy rains had ended. I The Soos Creek channel on the north side of 118"' Ave 6E between UniLs C I and b on the attached site plan was faxrly fu11 with a water level about i 3-4 faet below the road 1eve1. The deb�ri� level along t$e edge of the channel skzow'ed that a water level had been about 1-1.5 foot higher than I the eatis�iag leve7.. Baeed on the slow rotation of �he water surface at !, the south end of the chanzlel, the chazuiel was slow].y drainxng south th�ough the 2-24inch culverts under 118`ti Ave 6E. The tenuis courts on the south aide of the road were wet and �ooked as though several feet of water had been pond�d there zecemtly. The Nw-S� channel lvcated just south of the Recreation Buildiag waa very fulZ and appeared to be draini,ng S� at the outlet of the culverts under 1i8`a. ��ia phone, I ta�ked �to cartex on 11-20-01. She. Baid the cha�ne� north � of liB`b had flooded to withiu about one foot o� the top of zts banks � and about 2 feet of water had ponded in the tennfa courts on the eouth ' eide of 118`a`. j After conferring in our o#fice with Larry Gettle and Mike Malnerich, I called Carter bacl� on 11-28-01 and to�d hex the flooding in the channel and tennis courts were normal for a heavy 3 day rainfall with partial plugging of one or more downatream culvert entrancee. I thanked her foz her complaS.nt and gave her our 206-296-1900 complaint number and the roads 24-hour complaint nwaber at zo6-296-8100. Tlze photos I took at the site were not found in my dlgital camera. , .. __ . . -- '•'}- t�-'� � - `Gr''"" '� � . . � . w� � � r � � y, . , ,�_ - - ; , A + . .< :g _ ' , ''` _ � ��° � ? ' � ' ,� v� ' �C �, ,,�' ,` r y �,V �-r .,: � ��2 . .,.�..,�,°� . , ,�� ,. �(/� ., �E-, � � . r� �o �yC� �' � t � . ti ""� \ ��y, � ��, , O 116�1AV�'� 1�y�r:M A�'I � ,, �� / �}�� y 8l'7 � � � 1'�� 1�{0�,M1 '� 3�!:l'2' i ^ ��. �'4 ' 't�e�l�ll .� fi 70' �� ,�� B' 4 . �'� � . S'' . .� (E" �,i� Q � ' C/- G K /.1 Cgl�{2i.A'� ✓/ i . /♦ '° <<a � vl , . ��1 '. � �1 / � �,` '� 2�� • 1 �1% QV Z � 1 � � � � .,N .�. '�,. G� + � �� . '��.'� �S . � - � , ,�: : �Z __'------•- ;. �� -i , i � r, � F� :� i `1 r � � � � .�q C � �v � � � � �--- ; � �o � g � `� � u � s• � � �` o ' � N � 6 .'' �. � � t`� / ,` � o ( � � � � n ,� G'',� � ' � q � �� { � m ^ , � J � �z �N'"�i .1`Y.LC�C�✓ L•iu1�G�:vut�i Y�wA.�'.��D LAND� '� `D�Q''•S DIVISIVPt r i.� r.cJi� ; D�tAINAGE INVESTIGATYON REPORT W V84TIGATION R&QUEST � T`ype Y• �I� PROBLEM: Bv: Date:3r � �3 OK'd b . Fn.E No. 2003 - tcecei�ved fi-om: �-UW�(Yph ��i �q h � (�Y) �� (Eve) � ) NAn� PHorrE ADDRESS: ` � O� 2 �� ' � City ►'O'1 Stat_4 Zip � LO(',ATION OF pROBLEM,IF DIFFERENT: CU S�A�. 1"G� CO I��J. :.�.��V� �� 1 G�{� -i . '--r ' � �—•— Acccrs Permissio� Granted � Call First (wou(d Xa7ao To He P�cscntj�Q� j�o�.�t1� W� ih5 c��" � �1 � � � � � , , . . �� - �� . �M . �!...s.. J 1 � . f � � �f.'y..� ' A- �'' II r�ai name: ,�;=; �i;ot No: Block No: . � ; Other encies involved: ' • • No field investi tion ' d � .�•,y�?�,� •�� .� . ' ah�'..K �. �.� �i.��,,?1yi:��' Y %a S T R Parcel No.��Z�(�'"�Q o U Kroll 6�Z W T1LBros: New � � 'RDP Basin� ��O S �ouncil l��trict � City Charge�To. RFSPolvsB: Citi�ea notified ou by: • phone Iettor m person • . . , . bLSlbSITTON: T�uned to on / � / by OYL No further actioa recaa2mended because: Lead agency has boen noti5ed: . .. . � ., Pcoblem has been coirected. No problem hav been identified. Piior investigarion addr�sses problem: SEE FII.E# private problem -NDP►P will not consider because: � _�Waber orig�ates oasita and/or on neigi�boring parcel. ' • ' . - Other(SPec�fj'): L :.`Y.OSED: / / By: - . . • • . • : , . . � � , ' . .'� .' - . • . , . • . � . � � ' - � - •;' - • • - • . . . • • . " � . " ' .•' .' _:_.;._ _ ' ' � " : / ! TASK 5 MITIGATION OF EXISTING � ' AND POTENTIAL PROBLEMS 1- 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN ; � - .,;�} � �� ]1011.004.doc[DED/dm} � � 4. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN Part A: Existing Hydrology The Petro Vista project area has a total of 3.89 acres of which 2.71 acres will be developed(Table 1). The western portion of the site is predominately second growth forest and drains to a closed depression/wetland on the site. The depth of the depression is about 4 to 5 feet. During large storms the depression likely fills and overflows to a catch basin on the south side of SE Petrovitsky Road. The eastern portivn of the site has a construction company office building, a large metal storage shed, and an additional outbuilding. A gravel road accesses the construction office,metal shed, and cleared area where construction materials are stored. Second growth forest is the predominate cover type in areas that are not cleared. Based on 1977 aerial photographs of the site, the metal storage shed did not exist prior to that date and the majority of the site was pasture.The eastern portion of the site generally slopes to the east and flows to an offsite wetland(Figure 1). Based on the King County Soil Survey(U.S. Department of Agriculture, 1973) the site consists of Alderwood soils. Runoff from 4 acres of low density single-family residential development flows onto the project site across the south boundary of the site. Runoff collected by the roadside ditch along the east side of 118`t'Avenue SE also discharges to the project site. Runoff from both of these upstream areas '� contributes to the onsite closed depression/wetland. The ditch on the west side of 11 S`�Avenue SE intercepts runoff from upslope azeas to the west and conveys it to the stormwater conveyance system along the south side of SE Petrovitsky Roa3. SE Petrovitsky Road is located along the north property line of the site. A conveyance pipe collects runoff from SE Petrovitsky Road and upstream areas and i discharges to the wetland located along the east boundary of the project site. '� Part B: Developed Site Hydrology I! The proposal for development includes building 18 single-family dwellings and road improvements along the east side of 118`�Avenue SE(Figure 2). Under developed conditions,development will consist of 0.96 acre of lawn/landscape and 1.75 acres of impervious area, including the offsite road improvements. Cover type areas for developed conditions are summarized in Table 1. Under developed conditions, stormwater from the site will be discharged in three different locations including the following: ■ Runoff from Lots 15-18 will be dispersed into the buffer of the wetland in Tract B ■ Runoff from Lot 13 will be dispersed into the buffer of the wetland in Tract C ■ Runoff from the remainder of the site will be conveyed to the stormwater facility and discharged to the conveyance system on SE Petrovitsky Road Runoff from the roofs and lawns of Lots 15-18 will be collected and dispersed into the buffer of the wetland in Tract B.These lots were selected to match the existing peak flow rates and average annual runoff volumes to the wetland, in effort to maintain the wetland's hydrology. A tabulation of � the areas draining to the wetland, for both existing and proposed developed conditions, is provided in Petro V'rsta 71R-Nm�emdrr 2004 = �� Appendix B.4.The predicted 2-, 10-, and 100-year peak flows rates to the wetland match within " reason for existing and developed conditions. The average annual runoff volume to the wetland, however, is reduced from 1.25 acre-feet per year to 0.74 acre-feet. Because Lot 13 is too low in elevation to convey its runoff to the stormwater facility, it will be treated independently of the remainder of the site. Drainage from Lot 13 will be dispersed into the 100-foot buffer of the wetland in Tract C. The 100-year undetained peak flow rate from Lot 13 under developed conditions was estimated to be 0.038 cubic foot per second. Runoff from the remainder of the site will be collected and treated onsite in a treatment train consisting of a wet vault, followed by a sand filter, followed by a leaf compost filter. The treatment train is designed to meet bog water quality standazds. Level 1 R/D standards will be provided with a stormwater vault. Discharge from the outlet of the stormwater system will be tightlined to a catch basin in SE Petrovitsky Road. Table 1. Existing and Developed Site Basin Conditions used for Vault Design EaasNng Conditions(1979 cover are listed for the east basin) Till- Till- Till- Subbasins KCRTS forest pasture Wetland grass Imperv. Total Basin (AC7 (AC) (AC) (AC7 (AC) (AC7 Developed Area-West Basin 2.03 2.03 Developed Area-East ' Basin extarl 0.03 0.33 0.07 0.13 0.56 Lot 13-East Basin exlotl3 0.12 0.12 Wetland/Buffer 1.06 0.12 1.18 Total 3.24 0.33 0.12 0.07 0.13 3.89 Developed Conditions Till- Till- �'ill- Subbasins KCRTS forest pasture Wetland grass Imperv. Total Basin (AC) (AC) (AC) (AC) (AC) (AC) Developed Area to dev Stormwater Facilit 0.79 1.43 2.22 Developed Area to Onsite Wetland(Lots 15- 18) 0.12 0.25 0.37 Lot 13 1ot13 0.05 0.07 0.12 Wetland/Buffer I.06 0.12 1.18 Total 1.06 0.12 0.96 1.75 3.89 Note:Basin areas include 0.06 acre of offsite road improvements along the east side of 118 Avenue SE. Petro Vista TIR-November 2004 • Runoff from the tributary basin to the south,which currently flows to the site's closed I , ' depression/wetland, will be collected in an interceptor ditch along the south property boundary of the proposed plat and tightlined to a level spreader along the southeast edge of the wetland's buffer. I Part C: Performance Standards 'I A summary of flow control, conveyance, and water quality treatment performance standards for the I project is presented in Table 2,below. Table 2. Summary of Performance Standards Cate o Performance Standard Source '� Flow Control • Level 1 R/D ■ Flow Control �' Applications Map � Offsite tributary areas will be . Core Requirement#1 routed to the closed depression/wetland on the , project site ' Plat Conve ance S stem ■ Provide conve ance for ■ Su ace Water Desi n I Y Y Y rf 8 , Capacity developed 25-year storm Manual Section 1.2.4.1 Water Quality Treatment ■ Bog water quality treatment ■ Surface Water Design ; Menu standazds - wet vault+sand Manual Section 1.2.8.1; ; filter+leaf compost filter Site dischazges to Soos Creek Wetland No.2,a wetland with sphagnum bog components Source Controi ■ None proposed Oil Control ■ The site does not meet the ■ Surface Water Design definition of a hi -use site Nfanual Section 1.3.5 P�tro V'uTa77R-Navember20P4 _ Part D: Flow Control System KCRTS was used to design the proposed stormwater facility. Procedures and design criteria specified in the 1998 King County Surface Water Design Manual were followed for hydrologic modeling.Descriptions of the stormwater system and details of the design analysis aze provided below. A plan view of the stormwater system for the site is provided in Figure 3. For stormwater facility designs, the reduced KCRTS time series data set was used for the Seatac rainfall region with a correction factor of 1.0. Documentation of the KCRTS input and output, including vault design,times series routing, and peak flow rates is listed in Appendices A and B. Stormwater from the development will be managed with a facility designed to meet Level 1 R/D ' standards. Because the western portion of the site is a closed depression�, the discharge rate from the stormwater vault was limited to that of the eastern portion of the site.The azea for Lot 13 was excluded from the target time series,because it is not conveyed to the stormwater facili�under developed conditions.� _ -% ' ' , .=. �'�'�'�' 'y G - - �/ i `. v� . Peak flow rates representing the dischazge location from the R/D facility, for existing and developed � site condntions, are provided in the hydrologic model output in Figure 4.T'he peak flow rates match for the 2-yeaz and 10-year events for existing and developed conditions, indicating that Level 1 R/D criteria aze met at the outlet of the R/D facility.The stormwater facility requires 21,600 cubic feet of live storage. Assuming a 5 percent factor of safety, 22,680 cubic feet of live storage will be required. i Part E: Water Qua6ty System I Bog water quality standards apply to the site. A treatment train consisting of a wet vault, followed by ' a sand filter, followed by a leaf compost filter has been designed to meet the required standards. The required wet vault size was determined using procedures provided in Chapter 6 of the 1998 Surface Water Design Manual. Basin areas, annual runoff volumes and the required volume for a � basic wet vault are given in Table 3. Based on these calculations,the required wet vault volume is 7,600 cubic feet. The sand filter was sized using the routing method in KCRTS. Details of this routing assessment aze provided in Appendix B.3. A sand filter with 800 squaze feet of surFace area is required to provide treatment to 90 percent of the average annual volume flowing to the facility.The sand filter design assumed a 1-foot storage depth in the filter and a sand media hydraulic conductivity of 45 minutes per inch. The size of the leaf compost filter is based on the 2-year post detention rate from the stormwater sand filter. 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Z�� $ 3'50.090 GIGE ' ' S.UNOER DRAIN PIPE SIALL BE 6 a1CH OLWETFR PYC S[M35 WiM 2 ROWS OF 1qLES 1 �Y1CN DNNFIER) N � BOL7E0 OR IYBEODED � �/ �a�� i _ Y IX O � ' • • SPM,ED B PICN6 APIFi LONGfIUOYY�LLY(NVc.)MIM RONS tY0 DEGRE6 MARf(WD M�IIH NOLES 3�n in ci� MA1L 3r-0 SPICNG WTLET PIPE ' - � STCRMFILTER DO�MMl�fO) h N� WC`,, .. 1T�YN 2�YN (SEE IqTE 4) IE=100.97 `UNOERORNN ��in N s E (N/l ONE SWPORh � Cut�RiOGE(TW) - 12�$D NIlMfOLO 6.HL GRATED OGFMNGS$IWL�LDCIONG 6M7E5 N!D ARPCRf M-20 TRKFIC L6�pHG N Z[V IV K (SEE WJTE 2) �w v v �� a�+�n c,�7¢. ro�� 6� x 8� SiORM�fLTER - VLAN VfEW 6' x 8" S70RMFILTER SfCiION VIEW pa 7.T/E 11D QYER THE SNlU fLTER CE11 41M1 BE RELOVABIF DH1El5 WER Ti[[NflqE$µp g[D.P�VELS Y�� - e"DLl 9EAR su�r[x srxc w.cs SIWl BE AT CR�OE.lN4E STMIFSS S7Ql 11F7NC LYFS.ND MEICti NO YORE iHW 5 TOMS vER PMEL � �p p IESER — � s GENERAI NOTES ��N�. o - a�ion TABLE 6.5.2D(:�OlEXTLE:SPEGRCA710WS fp��sd„ - ,B"N6F1+ g'� u„v,.i w�mon.s. .rn,�an.-..n. J A �Z E >.. ,.o..�o..:. OEO7DCRE PROP6iTT YALA� TEST A�lF1OD Q � _ 12'IY7 4" i.1 na..nv •...r m omsmca n.mooua.w nr� 1Y V s�+�+� ��H(�) �'�') �� KIHG COUNTY �.C.E.S. _ ' ^ ' BlIRSf SfR£nIG7X PS� 1J0 � ar r r ow� TABL.E 6.52C SAWD MEDIA b'PEGFICA7KNiS rwrezao ivw(�) a(rw) wrn o4sna �b a ��va to a eow �r�� i� ..,��d�� Kx ( ) MM �sru oa�as a � _ a��.ro i�. _ (1� Reviw Eng�neaf Cwnpletion Dote �'� ��ON g vY asernroM DN=�/Y '�=� .o..o...�..M`..,o,.p:R U,8 SEYE S� PBiCB�lf PASSl�K1 �Svciw�m�/scc) �_ tisn w si S� s .. , . � FLOW F�STRICTOR��W DEfAIL `��°�`�'`� �°•n m••,••� ua�a.s ss�o�oo vExccxr � y av.muca o�m�.a,a. r US.Ib.Q 70 Rl 100 PERCEM 10.TR�wK7lFf iQ56fN10E 70 fi OR 9RFATER AStY D4355 ROW RESTRICTOR FOR WETVAULT Nor ro wac p,�W M.�,.�"�.,.m a.�•..a us.�a ie +o To so rcHaxr whs: ra��. �y�,ee. comqst�«� oot� ' �I� x NOT iD SULE u.s.rb.w n io�s vFnc�r 'lGCEPfA&LffY CF C£OlE7CfILF 1MIEIML SH�Il BE B0.5E�ON ISTI D-1759. E � _ ;g •WNMUN YNIIES SHWID B[N 11f pEA�(fp pNINCDLE DRECfIDN. /Y.L JqAAES M. SANDERS, P.E Apprwal pote � � COMPOST FLTER DETALS us.rb so s To u vcxc�r n�rxx v,u;�s�rars�r uouww,wEncc aou vrwE��c.hsr pEyFy�MENf ENGINEER � � � US.No.100 tE4 TF1N1{PEHCEM RESULTS FRON ANY SMWtFD LOT Sull YEE ON IXC�TME rNNLM VALUFS Ccmmanta: � I� rrot To SGIE W iNE lABIF). SUIED W�W6 ARE fDR MQ:CR(flGl MD NONSEVFRE Ui'. U.A Xo.200 tF54 THAN 1 PERCFM �YPL�GTIOrS .. _ Figure 4. Comparison of Peak Fiow Rates for R/D Design �� Predeveloped Peak Flow Rates Flow Frequency Analysis � Time Series File:extarl.tsf Project Location:Sea-Tac I ---Annual Peak Flow Rates--- -----Flow Frequency Analysis------- Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.057 5 2/09/O1 2:00 0.118 1 100.00 0.990 0.040 7 1/05/02 16:00 0.067 2 25.00 Q.960 0.067 2 2/27/03 7:00 0.061 3 10.00 0.900 0.035 8 8/26/04 2:00 0.058 4 5.00 0.800 0.043 6 10/28/04 16:00 0.057 5 3.00 0.667 0.061 3 1/18/a6 16:00 0.043 6 2.00 0.500 0.058 4 11/24/06 3:00 0.040 7 1.30 0.231 0.118 1 1/09/08 6:00 0.035 8 1.10 0.091 Computed Peaks 0.101 50.00 0.980 ' DeveloDed Peak Flow Rates Flow Frequency Analysis I Time Series File:levlout.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 0.310 2 2/09/O1 15:OU 0.715 5.16 1 100.00 0.990 0.039 7 12/28/O1 18:Q0 0.310 5.08 2 25.00 0.960 0.060 4 3/06/03 23:00 0.062 4.98 3 10.00 0.900 0.035 8 8/26/04 7:00 0.060 4.70 4 5.00 0.800 0.043 6 1/05/05 17:00 0.056 4.21 5 3.00 0.667 0.056 5 1/19/06 1:00 0.043 3.17 6 2.00 0.500 �� 0.062 3 11/24/06 10:00 0.039 2.57 7 1.30 0.231 I 0.715 1 1/09/08 9:0� 0.035 2.05 8 1.10 0.091 I Computed Peaks 0.580 5.14 50.00 0.980 � l.� � r � ° � �j�d�LE _- i . . .;'.C, j 1: u.,�.�r � � : � � �r i ��CJ G�-�� 4� �,��.`�,`�.ti �' .�t : � �� , �, �� , Paro V'uta 7lR-Nove�nlxr 2004 -� Tabie 3. Treatment Wetland Sizing Calculations Till Till Runoff Wet Vault Wet Vault Forest Grass Impervious Total Area Volume Vb/Vr Volume Facility (AC� (AC7 (AC7 (AC7 (CF� (CF� Onsite Stormwater Facility Developed Area to Stormwater Facility 0.00 0.73 1.17 1.90 2,108 3.0 6,324 R/D Tract 0.00 0.06 026 0.32 425 3.0 1,274 Total 0.00 0.79 1.43 2.22 2,533 7,598 Mean annual storm = 0.47 inch Peuo vuro 7nz—rvovene6�e.2ooa . A endix A. Stormwater R D S stem De i n li Pp / Y S g Appendix A.1 Stormwater Facility Control and Overflow Design Appendix A.2 KCRTS Stormwater Facility Design Pe[ro V'�sw 77R-NovemGer 2004 Appendix A.1 Stormwater Facility Control and Overflow Design Qa��ccFs�: C. ^.ve v!5. �-s� � 2.09 (KCRTS IS-minute peak rate) Top of Control Structure Riser (FT) 412.00 Overflow WSE(FT) 41230 Structure Head Capacity Elevation WSE Structure Size Units (FT) (CFS) (FT) (FT) Design Operation Riser Rl 18 inches 0.00 412.00 412.00 Emergency Overflow Riser R1 18 inches 0.30 2.40 412.00 412.30 Head (�T) Design Head above Required Freeboard: Riser 0.00 Emergency Overtlow 030 Total Required Freeboard 0.30 1 �� Paro V'rsta 77R-Na+em6rr20Q4 C:1Petrolpetro.doc O 1/10/200� Reten�ion;Ceter.ticn �'acility Tyoe of Facility: Cetent_on Vaul� �ac�lity Ler.gth: 116.00 ft Facility �n]idth: 4�.00 ft Facility Area: 4640. sc. =t Effec�ive Storage Cepth: 5.00 t� Stage 0 Elevatior.: 907.00 f� Storaae Vo�ume: 23200. cu. ft Riser Head: 5.00 ft Riser Diameter: 18.00 ir.ches I Number of orifices: 2 Full Head Fipe , Orifice # Heignt Diameter Discnarge Diamet�r , {ft) (in) (CFS; (in) 1 0.00 0. 94 C.054 2 3.22 0.50 0.009 4 . 0 Top Notch 4deir: None Outflow Rating Cnrve: None ' Stage Elevation Storage Discharge Percolatio:� (ft} (ft) (cu. ft) (ac-ft) (cfs) (�fs) O.CO 407 .00 0. 0.000 0.000 0.00 O.Oi 40? .O1 46. 0.001 0.002 0.00 0.02 �07 .02 93. 0.002 0.003 0.00 O. Q3 �07 .03 139. O. 0O3 0. 009 O. OG 0. 04 407.04 186. O. G09 0.005 O.OG ; 0. 05 407 .05 232. 0. 005 0.005 0. 00 0. 06 407 .06 27�. 0. 006 0.006 0. ^u0 0.0? 4C7.07 325. 0.007 0.006 O.CO 0.08 407.08 371. 0.009 0.007 O.CO 0.09 407.09 418. 0.010 0.007 O. CO 0. 19 907. 19 8�2. 0.020 C.O1C O. G�i 0.29 40?.29 1346. 0.031 C.013 O, O�i 0.39 407 . 39 1810. C.042 C.015 O. G�� 0.99 407 .49 22?4 . C.052 0.017 0. 0�� 0. 59 407 . 59 2?38 . Q.063 0.018 �.G� 0. 69 407. 69 32G2. 0.073 0.020 O.00 0. 79 407.79 3660. 0.084 0.021 O.00 0. 89 407.89 913G. G.095 0.023 O.00 O. y9 907. 99 4599 . O. 1G� 0. 024 O.00 1. 09 908.09 505E�. 0. 116 O. C25 O.00 1. �9 908. 19 5522. 0.127 0. 026 C.00 1.29 908.29 5986. 0.137 0. 027 C.00 1. 39 408.39 6450. 0. 148 0.028 C.00 1. 49 908 . 49 6914. 0. 159 0.029 O.OG 1.59 908.59 7378. 0. 169 0.030 O.OG 1. 69 408.69 7842. 0. 180 0.031 O.OG 1 .?9 408.?9 8306. 0. 191 0.032 O.00 1 . 89 408 . 89 87`]0. 0.201 0.033 Q.Ou 1 . 99 408. 99 9239 . 0.212 �.039 G.00 2 .09 409. C9 9698. 0.223 0.035 O. CC� 2 . 19 409. 19 10162 . 0.233 0.035 O. CO 2.2� 409.29 10626. 0.299 C.036 O.CO 2.39 409.39 11090. C.255 0.037 O.CO 2. 4a 409.49 ,�1554 . C.265 C.0?8 O. C�' 2 . 59 y09.�9 �2018 . 0.2,6 C . �� .. . �� 1 of 3 C:',,Petrolpetro.doc O 1;'10.,'200� 2 . 69 409. 69 12482. 0.287 C.039 O.00 2.79 409.;9 129�6. 0.297 C.040 0.0� 2 . 89 409.89 134�0. 0. 308 G.041 O.00 2. 99 409. 99 13874 . 0. 318 C. 041 O.00 3. 09 410.09 14338. 0. 329 0.042 0.00 3. 19 410.19 14802. 0.340 0.043 0.0� 3.22 41Q.22 14941. 0.343 0 .043 0.0� 3.23 410.23 19987. 0.344 0.043 0. 0� 3.24 410.2� 15034 . 0.345 0.044 0.0� 3.25 410.25 15080. 0.346 0.044 O. G� 3.26 410.26 15126. 0.347 0.045 0. 0� 3.2? 410 .27 i5173. 0.348 0.045 0. 00 3.3i 4i0. 37 i5637. 0.359 0.047 O. CO 3. 4? 410. 4? i61C1. 0.370 0.048 O. C�� 3.5i 4�0.57 16565. 0.380 0.049 O. CO 3. 6? 4'_0. 67 17029. 0.391 0.050 O. CO 3.�? 4�0.77 17493. 0. 4C2 0.052 O. CO 3. 87 4'_0.8? 1�95? . 0.412 0.053 O. CG 3. 9? 410. 97 18421. 0.423 0.054 O. �G 4 .0? 411.07 1�885. G.434 0.055 O.�u 9 . 17 411. 17 19349. C.494 0. 056 0.�0 9 .2? 411.27 19813. C.455 O. C�6 O. �C� 9 .3? 411. 3i 202?7. C.465 O. C�7 O.��G 9 . 47 411. 9i 20791 . C.476 0. 058 O.00 4 .57 411.57 2"�205 . C.48? 0. 059 O.OG 4 . 67 411. 6i 21669. C.497 0. 060 O.00 9 .77 411.?i 22133. 0.508 O.C61 O.OG 4 .87 411. �7 22597. C.519 0. 062 C.pr 9 . 97 411. 97 23061. 0.529 0. 062 C.GC 5.00 412.00 23200. 0.533 0.063 C.00 5. 10 412. 10 23664 . 0.543 0.525 C.GC 5.20 912.20 24�28. 0.554 1.370 O.GC 5.30 412.30 24592. 0.565 2.470 O.00 5.40 412.40 25056. 0.575 3.?60 O.GC 5. 50 412.50 25520. 0.586 5.230 O.00 5. 60 412. 6� 25989 . 0.597 6. 660 0.00 5. 70 412.70 26498. ��. 607 7 . 190 0.0� 5. 80 412.�0 269�2. 0. 61� 7 . 680 0.00 5. 90 412. 9� 27376. 0. 628 8 . 140 O. G� 6. G0 413.0� 27840. 0. 639 8 .580 0. 0�� 6. '�0 913. 1�� 28304 . 0. 650 9.000 O. G� 6.�0 913.20 28708. 0. 60'0 9.39C 0. 0�� 6. 30 413. 30 29232. 0. 671 9.77C O. C� 6. 40 913. 40 29696. 0. 682 1�. 14C O. C� 6. 50 413.50 30160. 0. 692 10.500 O. CO 6. 60 413. 60 30629 . 0.703 10.�40 O. CO 6. ?0 41.�.70 31088. 0.714 11. i70 O.CG 6. 80 913.80 31552. 0.?24 11.�90 O. CO 6. 90 413. 90 32016. 0.735 11.810 O. C�� 7 . 00 914 .00 32480. 0.746 12. i10 p, r0 Hyd Inf�ow Outflow Feak Storag� Target ^alc Stage Elev ;Cu-Ft) ,=c-Fr � 1 0.84 *�***** 0.7G 5. i2 412. 12 2376C. � �.54� 2 0.42 *F****� 0.27 5.05 412.05 23412. 0.53? 3 0.42 0.06, 0.06 4 .71 411.71 21849. 0.5�� 4 0.50 ******� 0.06 4 .�3 411.53 21022. 0.48? 5 0.44 ******* 0.05 3. 96 410. 96 18396. 0.922 6 0. 26 O. C4 0.09 2. 99 �09. 99 13875. 0.319 0. 34 ****F*� 0.09 2. 45 409. :5 11?��. �. �Fl 2 of 3 � . C:'�,Petrolpetro.doc O 1/10!2005 , 8 0. 3? *�***** 0.03 1. 95 4G8. 9� 902'c. 0.2Q7 �I ---------------------------------- Rc�;te Time Series t}:rcugh Facility In�low Time Series File:dev.tsf C�tflow Time Series File:levlo�:t Inflow/Outflow Ana�ysis I Peak Inflow Discharge: 0.843 CcS a� 6:00 or. Jar. 9 in YeGr 8 PeGk Outflow Discharge: 0.701 CrS a� 9:0� or Jar. 9 ir Year � Peak Reservoir Stage: 5. i2 F� Peak Reservoir Elev: 412.12 F� ?eak Reservoir Storage: 23760. Cu-I't . 0.595 Ac-Ft Flow Freque�cy Analysis Time Series File:levlout.tsf Project Locatio�:Sea-Tac ---F.nnual Peak Flow Rates--- -----Flow Frequency A�alysis------- Flow Rate Rank Time cf Peak - - Feaks - - Rank Return Frob (CFS; (CFS) {ft) Period 0.275 2 2/09/O1 16:Q0 0.7C1 5. 12 1 i00.00 0. 99:1 0.038 7 12/29/O1 10:00 0.275 5.05 2 25.00 0. 960 0.059 4 3/07/03 0:00 C.060 4 .71 3 i0.00 0. 90n 0.034 8 8/26/C4 7:OC 0.059 4 .53 4 5.00 0.8CG O.G41 6 1/05/05 17:00 0.054 3. 96 5 3.00 �. 66�' 0.054 S 1/19/06 1 :00 0.041 2. 99 6 2.00 O.S�C 0. 06C 3 11/2�/06 10:00 0. 03� 2. 45 ? 1. 30 0.23i 0. 701 1 1/C9/08 9:00 0. 034 1. 95 8 1. 10 O.C�91 �o�r.o�=ed P2aks 0. 5�9 5 . 1� 50. 00 G. 9'_'J 3 of 3 i Appendix A.2 KCRTS Stormwater Facility Design Retention/Detention Facility Type of Facility: Detention Vault r� Facility Length: �► (� _-�9$�"ffD ft �/ j p�..�,� � i�� Facility Width: 40.00 ft Facility Area: 9.32-0. sq. ft Effective Storage Depth: 5.00 ft Stage 0 Elevation: 407.00 ft Storage Volume: 216Q0. cu. ft Riser Head: 5.00 ft Riser Diameter: J ��1�:00 inches Number of orifices: �2 Full Head Pipe Orifice # Height Diameter Discharge Diameter {ft) (in) (CFS�. _ .. _ Errr} -- �� r► �, ; ��y�" 1 0.00 0.94 ..� -"- 0.054 � ! / 2 3.22 0.50 0.009 4.0 Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation (ft} (ft) (cu. ft) (ac-ft) (cfs) (cfs) 0.00 407.00 0. 0.000 0.000 0.00 0.01 407.01 43. 0.001 0.002 0.00 I 0.02 407.02 86. 0.002 0.003 0.00 0.03 407.03 130. 0.003 0.004 0_00 ' 0.04 407.04 173. 0.004 0.005 0.00 0.05 407.05 216. 0.005 0.005 0.00 0.06 407.06 259. 0.006 0.006 0.00 0.07 407.07 302. 0.007 0.006 0.00 j 0.08 407.08 346. 0.008 0.007 0.00 I 0.09 407.09 389. 0.009 0.007 0.00 ' 0.19 407.19 821. 0.019 0.010 0_00 0.29 407.29 1253. 0.029 0.013 0.00 0.39 407.39 1685. 0.039 0.015 0.00 i 0.49 407.49 2117. 0.049 0.017 0.00 0.59 407.59 2549. 0.059 0.018 0.00 0.69 407.69 2981. 0.068 0.020 0.00 0.79 407.79 3413. 0.078 0.021 0.00 0.89 407.89 3845. 0.088 0.023 0.00 0.99 407.99 4277. 0.098 0.424 0.00 1.09 408.09 4709_ 0.108 0.025 0.00 1.19 408.19 5141. 0.118 0.026 0.00 1.29 408.29 5573. 0.128 0.027 0.00 1.39 408.39 6005_ 0.138 0.028 0_00 1.49 408.49 6437. 0.148 Q.029 0.00 1.59 408.59 6869_ 0.158 0.030 0.00 1.69 408.69 7301. 0.168 0.031 0.00 1.79 408.79 7733. 0.178 0.032 0.00 1.89 408.89 8165_ 0.187 0.033 0.00 1.99 408.99 8597. 0.197 0_034 0.00 2.09 409.09 9029. 0.207 0.035 0.00 2.19 409.19 9461. 0.217 0.035 0.00 2.29 4Q9.29 9893_ 0.227 0.036 O.Oa 2.39 409.39 10325_ 0.237 0.037 0.00 2.49 409.49 10757. 0.247 0.038 0.00 Penn Vina 77R-Novendxr2004 �i ;�f: �lf a v� . "f S I Ta, �� ; ,vy� -- 0. � 6 � . � — a, d43 � C�5 _, 2.59 409.59 11189. 0.257 0.039 0.00 2.69 409.69 11621. 0.267 0.039 0.00 � 2.79 409.79 12053. 0.277 0.040 0.00 2 .89 409.89 12485. 0.287 0.041 0.00 2.99 409.99 12917. 0.297 0_041 0.00 3 .09 410.09 13349. 0.306 0.042 0.00 3.19 410.19 13781. 0.316 Q.043 0.00 '��G 3.22 410.22 13910. 0.319 0.043 0.00 3.23 410.23 13954. 0.320 0.043 0.00 3.24 410.24 13997. 0.321 0.044 0.00 3.25 410.25 14U40. 0.322 0.044 0.00 3.26 410.26 14083. 0.323 0.045 �.00 3 .27 410.27 14126. 0.324 0.045 0_00 3.37 410.37 14558. 0.334 0.047 0.00 3.47 410.47 14990. 0.344 0.048 0.00 3.57 410.57 25422. 0.354 0.049 0.00 3.67 410.67 15854. 0.364 0_050 O.OU 3.77 410.77 16286. 0.374 0.052 0.00 \ 3.87 410.87 16718. 0.384 0.053 0.00 3.97 410.97 17150. 0.394 0.054 0.00 • 4.07 411.07 17582. 0.4U4 0.055 0.00 1 � O�e ' \ 4.17 411.17 18014. 0.414 0.056 0.00 _ __�_ [ � 4.27 411.27 18446. 0.423 0.056 0.00 �,I �'� e�D`-Y- � 4.37 411.37 18878. 0.433 0.057 0.�0 '� '0�,�- �(. �' 4.47 411.47 19310. 0.443 0.058 0.00 `�., � �'yn��"-"'- " � 4.57 411.57 19742. 0.453 0.059 0.00 �`�,�E� / 4.67 411.67 20174. 0.463 0.060 0.00 �Q- •� � � 4.77 411.77 20606. 0.473 0.061 0.00 �, .. t'�* 4.87 411.87 21038. 0.483 0.062 0.00 `�6�� V"""`""'! 4.97 411.97 21470. 0.493 0.062 0.00 Q��'"" � � ; 5.00 412.00 21600. 0.496 0.063 0.00 , U �,�. 5.10 412.10 22032. 0.506 0.371 0.00 5.20 412.20 22464. 0.516 0.935 0_00 5.30 412.30 22896. 0.526 1.670 0.00 .�. td��•1c�a'-e • 5.40 412.40 23328. 0.536 2.460 0.00 � 5.50 412.50 23760. 0.545 2.740 U.00 5.60 412.60 24192. 0.555 3.000 0.00 5.70 412.70 24624. 0.565 3.230 0.00 ' 5.80 412.80 25056. 0.575 3.450 0.00 5.90 412.90 25488. 0.585 3.660 0.00 6.00 413.00 25920. 0.595 3.850 0.00 ' 6.10 413.10 26352. 0.605 4.U40 0.00 6.20 413.20 26784. 0.615 4.210 0.00 6.30 413.30 27216. 0.625 �.380 0.00 6.40 413.40 27648. 0.635 4.550 0.00 6.50 413.50 28080. 0.645 4.710 0.00 6.60 413.60 28512. 0.655 4.860 0.00 6.70 413.70 28944. 0.664 5.010 0.00 6.80 413.80 29376. 0.674 5.150 0.00 6.90 413.90 29808. 0.684 5.290 0.00 7.00 414.00 30240. 0.694 5.430 0.00 Hyd Inflow Outflow Peak Storage Target Calc Stage Elev "' " � '- - � �� 1 0.84 ******* 0.71 5.16 412.16 , /tIl I 2 0.42 ******* 0_31 5.08 412.08 � s � /j�J. ' 3 0.5 4 0.10 0.0 6 4.9 8 411.9 8 F � � i j,Gt�,r�' � �� 4 0.50 ******* 0.06 4.70 411.70 � � � �' ' S 0.44 ******* 0.06 4.21 411.21 I 6 0.45 0.06� 0.04 3.17 410.17 � �,1 � � � 7 0.34 ******* 0.04 2.57 409.57 � � ,,;,_ � 1 '�� Pmv Yula 7TR-Nmrmber2004 U �.� 8 0.37 ******* 0_03 2.05 409.05 8851. 0.203 �T� � Pemv Yuw 77R-Novanber2004 Appendix B. KCRTS Modeling � Appendix B.1 KCRTS Time Series Calculations Appendix B.2 KCRTS Peak Flow Rates � Appendix B.3 KCRTS Sand Filter Sizing �I Appendix B.4 Hydrologic Assessment of Onsite Wetland '�, Perm V'tstu 77R—NavernGer IA04 �,� Appendix B.1 KCRTS Time Series Calculations Vault Sizing KCRTS Command I ------------- � CREATE a new Time Series ' ------------------------ � Production of Runoff Time Series I Project Location : Sea-Tac Computing Series : extarl.tsf Regional Scale Factor : 1.00 Data Type : Reduced Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDM\KC_DATA\STTF60R.rnf . Till Forest 0.03 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STTP60R.rnf . Till Pasture 0.33 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STTG60R.rnf _ Till Grass 0.07 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf _ Impervious 0.13 acres -------------- Total Area : 0.56 acres Peak Discharge: 0.118 CFS at 6:00 on Jan 9 in Year 8 ' Storing Time Series File:extarl.tsf . Time Series Computed KCRTS Command ; � ------------- _# Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command ---------------------- Compute PEAKS and Flow Frequencies ---------------------------------- Loading Stage/Discharge curve:extarl.tsf . Flow Frequency Analysis -------------------------------------------------------- Time Series File:extarl.tsf Project Location:Sea-Tac , Frequencies & Peaks saved to File:extarl.pks . I Analysis Tools Command ', Compute Flow DURATION and Exceedence ------------------------------------ Loading Time Series File:extarl.tsf . Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:extarl.dur . Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command Petro V'uta 77R-Novrndxr 2004 _. CREATE a new Time Series � ------------------------ - Production of Runoff Time Series Project Location : Sea-Tac Computing Series : dev.tsf Regional Scale Factor : 1.00 Data Type : Reduced Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDP�I\KC_DATA\STTG60R.rnf . Till Grass 0.79 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf . Impervious 1.43 acres -------------- Total Area : 2.22 acres Peak Discharge: 0.843 CFS at 6:00 on Jan 9 in Year 8 Storing Time Series File:dev.tsf . Time Series Computed KCRTS Command Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command ---------------------- Compute PEAKS and Flow Frequencies ---------------------------------- Loading Stage/Discharge curve:dev.tsf . Flow Frequency Analysis -------------------------------------------------------- � Time Series File:dev.tsf ` Project Location:Sea-Tac Frequencies & Peaks saved to File:dev.pks . Analysis Tools Command ---------------------- Compute Flow DURATION and Exceedence ---------------------------------- Loading Time Series File:dev.tsf . Computing Interval Locations Computing Flow Durations Durations & Exceedence Pzobabilities to File:dev.dur . Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command ---------------------- Compute VOLUME Discharge ------------------------ Time Series Found in Memory:dev.tsf . Discharge Volume ---------------- Discharge Volume from Time Series Petro V'rsta T/R-Navember 2Q�4 dev.tsf � between 10/O1/00 00:00 and 09/30/08 23 :59 . 1512461. Cu-Ft or 34.721 Ac-Ft in 2920.0 days Discharge Volume File:dev.prn . Volume Computed Analysis Tools Command ---------------------- RETURN to Previous Menu -------------——---- Petm V'uw TfR-Novembtr 2004 Hydrology Assessment of Lot 13 � KCRTS Command CREATE a new Time Series ------------------------ Production of Runoff Time Series Project Location : Sea-Tac Computing Series : 1ot13.tsf Regional Scale Factor : 1.00 Data Type : Reduced Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDM\KC_DATA\STTG60R.rnf . , Till Grass 0.07 acres ' Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf . ' Impervious 0.05 acres , Total Area : 0.12 acres Peak Discharge: 0.038 CFS at 6:00 on Jan 9 in Year 8 � Storing Time Series File:lotl3.tsf . Time Series Computed KCRTS Co�nand � CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac Computing Series : exlotl3.tsf , - - Regional Sca1E Factor : 1.00 � Data Type : R�duced I Creating Hourly Time Series File � Loading Time Series File:C:\KC_SWDM\KC_DATA\STTF60R.rnf . Till Forest 0.12 acres Total Area : o.12 acres Peak Discharge: 0.010 CFS at 9:00 on Jan 9 in Year 8 I Storing Time Series File:exlotl3.tsf . Time Series Computed KCRTS Command �I ------------- �I Enter the Analysis TOOLS Module I ------------------------------- I Analysis Tools Command � ---------------------- � Compute PEAKS and Flow Frequencies �I ---------------------------------- I Loading Stage/Discharge curve:exlotl3.tsf . Flow Frequency Analysis -------------------------------------------------------- Time Series File:exlotl3.tsf Project Location:Sea-Tac ' Frequencies & Peaks saved to File:exlotl3.pks . Analysis Tools Command ---------------------- Compute Flow DURATION and Exceedence ------------------------------------ Loading Time Series File:exlotl3.tsf . Petro V'uut 77R-Nowrmtxr 2A04 _ Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:exlotl3.dur . Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command Enter the Analysis TOOLS Module ----------------------------- Analysis Tools Command ---------------------- Compute PEAKS and Flow Frequencies ---------------------------------- Loading Stage/Discharge curve:lotl3.tsf . Flow Frequency Analysis -------------------------------------------------------- Time Series File:lotl3.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:lotl3.pks . Analysis Tools Command ---------------------- Compute Flow DURATION and Exceedence ------------------------------------ Loading Time Series File:lotl3.tsf . , Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:lotl3.dur . Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command eXit KCRTS Program ------------------ Petro V'Wa TTR-Naveneber 2Q04 Hydrology Assessment of Onsite Wetland KCRTS Command CREATE a new Time Series ----------------------- Production of Runoff Time Series Project Location : -Tac Computing Series : , '` et.tsf Regional Scale Factor : 1.00 Data Type : Reduced Creating Hourly Time Series File , Loading Time Series File:C: \KC_SWDM\KC_DATA\STTF60R.rnf . Till Forest 4.53 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STTG60R.rnf . Till Grass 1.65 acres Load,}ng Time Series File:C:\RC_SWDM\KC_DATA\STWL60R.rnf . Wetland 0.12 acres Loadirig Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf _ Impervious 0.90 acres Total Area : 7.20 acres Peak Discharge: l.11 CFS at 6:00 on Jan 9 in Year 8 Storing Time Series File:t"�xwet.tsf . Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command ---------------------- Compute PEAKS and Flow Frequencies ---------------------------------- Loading Stage/Discharge curve:texwet.tsf . Flow Frequency Analysis -------------------------------------------------------- Time Series File:texwet.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:texwet.pks . Analysis Tools Conunand ---------------------- Compute Flow DURATION and Exceedence ------------------------------------ Loading Time Series File:texwet.tsf . Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:te�vet.dur . Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command Pemo Ycrta TIR—Nove�nber 2004 ---------------------- � Compute VOLiJME Discharge Time Series Found in Memory:texwet.tsf . Discharge Volume ---------------- Discharge Volume from Time Series texwet.tsf between 10/O1/00 00:00 and 09/30/08 23:59 �25058. Cu-Ft or 53.376 Ac-Ft in 2920.0 days Discharge Volume File:te�cwet.prn . Volume Computed Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command CREATE a new Time Series ------------------------ Production of Runoff Time Series Project Location : Sea-Tac Computing Series : tfuwet.tsf Regional Scale Factor : 1.00 Data Type : Reduced Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDM\KC_DATA\STTF60R.rnf . Till Forest 2.55 acres Loading Time Series File:C:\K.C_SWDM\KC_DATA\STTG60R.rnf . Till Grass 1.77 acres Loading Time Series File:C:\KC_SWDM\RC_DATA\STWL60R.rnf . Wetland 0.12 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf . Impervious 1_10 acres -------------- Total Area : 5.54 acres Peak Discharge: 1.08 CFS at 6:00 on Jan 9 in Year 8 Storing Time Series File:tfuwet.tsf . Time Series Computed KCRTS Command Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command ---------------------- Compute PEAKS and Flow Frequencies ---------------------------------- Loading Stage/Discharge curve:tfuwet.tsf . Flow Frequency Analysis -------------------------------------------------------- Time Series File:tfuwet.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:tfuwet.pks . Analysis Tools Command ---------------------- Compute Flow DURATION and Exceedence Pem�4'"�sta 77R-Novtmbrr 2004 ------------------------------------ Loading Time Series File:tfuwet.tsf . Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:tfuwet.dur . Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Com�nand Enter the Analysis TOOLS Module ------------------------------- Analysis Tools Command ---------------------- Compute VOLiJME Discharge ------------------------ Time Series Found in Memory:tfuwet.tsf . Discharge Volume ---------------- Discharge Volume from Time Series tfuwet.tsf between 10/O1/00 00:00 and 09/30/08 23:59 2147199. Cu-Ft or 49.293 Ac-Ft in 2920.0 days Discharge Volume File:tfuwet.prn . Volume Computed Analysis Tools Command ---------------------- RETURN to Previous Menu ----------------------- KCRTS Command eXit KCRTS Program ------------------ , -� /�`. - Pmro V'uw 77R-NavtmGer 2A04 ` = Appendix B.2 KCRTS Peak Flow Rates Vault Sizing extarl.tsf - East Dortioa of site that is proposed for develop�ent (minus Lot 13) under 1979 cover type conditions Flow Frequency Analysis Time Series File:extari.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 0.057 5 2/09/O1 2:00 0.118 1 100.00 0.990 0.040 7 1/05/02 16:00 0.067 2 25.00 0.960 0_067 2 2/27/03 7:00 0.061 3 10.00 0.900 0.035 8 8/26/04 2:00 0.058 4 5.00 0.800 0.043 6 10/28/04 16:00 0.057 5 3.00 0.667 0.061 3 1/18/06 16:00 0.043 6 2.00 0_500 0.058 4 11/24/06 3:00 0.040 7 1.30 0.231 0.118 1 1/09/08 6:00 0.035 8 1.10 0_091 Computed Peaks 0.101 50.00 0.980 dev.tsf - Portioa of site that is proposed for develop�eat that will be routed to the oasite stormvrater facility under proposed developed conditions 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 (CF'S) (CFS) Period 0.417 6 2/09/O1 2:00 0.843 1 100.00 0.990 0.341 8 1/OS/02 16:00 0.540 2 25.00 0.960 0.501 3 2/27/03 7:00 0.501 3 10.00 0.900 0.371 7 8/26/04 2:OU 0.446 4 5.00 0.800 0.446 4 10/28/04 16:00 0.443 5 3.00 0.667 0.443 5 1/18/06 16:00 0.417 6 2.00 0.500 0.540 2 10/26/06 0:00 0.371 7 1.30 0.231 0.843 1 1/09/08 6:00 0.341 8 1.10 0.091 Computed Peaks 0.742 50.00 0.980 Devl5.tsf - Portioa of site that is DroDosed for de.relo�eat that vrill be routed to the onsite stozmwater facility under proposed developed conditions (15-miaute time series used for vault rnrerflow desiga) Flow Frequency Analysis Time Series File:devl5.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 0.681 6 8/27/O1 18:00 2.09 1 100.00 0.990 0.483 8 1/05/02 15:00 1_46 2 25.00 0.960 1.46 2 12/08/02 17:15 0.950 3 10.00 0.900 0.548 7 8/23/04 14:30 0.830 4 5.00 0.800 Pemv V'uia TIR-Nmrmber 20�OW �u�a,-� v Gu� �- 4� r- � � l�Q"�` �x�a r l� l G � �_ �,�- � �,c,C'.�� /i� X�q�=� �� _� 0.830 4 11/17/04 5:00 0.814 5 3.00 0.667 0.814 5 10/27/05 10:45 0.681 6 2.00 0.500 0.950 3 10/25/06 22:45 0.548 7 1.30 0.231 2.09 1 1/09/08 6:30 0.483 8 1.10 0.091 Computed Peaks 1.88 50.00 0.980 leviout.tsf - Outflaw time series frosn stormvrater detention vault Flow Frequency Analysis Time Series File:levlout.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 0.310 2 2/09/O1 15:00 0.715 5.16 1 100.00 0.990 0.039 7 12/28/Ol 18:00 0.310 5.08 2 25.00 0.960 0.060 4 3/06/03 23:00 0.062 - 4.98 3 10.00 0.900 0.035 8 8/26/04 7:00 0.060 4.70 4 5.00 0.800 0.043 6 1/05/05 17:00 0.056 4.21 5 3.00 0.667 0.056 5 1/19/U6 1:00 -- 0_043- 3.17 6 2.00 0.500 0.062 3 11/24/06 10:00 0.039 2.57 7 1.30 0.231 0.715 1 1/09/08 9:00 0.035 2.05 8 1.10 0.091 Computed Peaks 0.580 5.14 50.00 0.980 sfout.tsf - Outfloao time series fro� etormwater sand filter Flow Frequency Analysis Time Series File:sfout.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 0.284 2 2/09/O1 15:00 0.686 1.13 1 100.00 0.990 0.014 6 1/07/02 2:00 0.284 1.06 2 25.00 0.960 0.035 4 3/06/U3 22:00 0.042 1.01 3 10.00 0.900 0.005 8 8/27/04 16:00 0_035 1.01 4 5.00 0.800 0.012 7 11/17/04 18:00 0.030 1.01 5 3.00 0.667 0.030 5 1/19/06 4:00 0.014 1.00 6 2.00 0.500 0.042 3 11/24/06 8:00 0.012 1.00 7 1.30 0.231 0.686 1 1/09/08 9:00 0.005 1.00 8 1.10 0.091 Computed Peaks 0.552 1.11 50.00 0.980 � Pttro Y�sw TIR-Novem(xr2004 � Hydrology Assessment of Lot 13 exlotl3.tsf - Lot 13 under forested conditions Flow Frequency Analysis Time Series File:exlotl3.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 0.008 2 2/09/O1 19:00 0.010 1 100.00 0.990 0_002 7 1/06/02 3:00 0_008 2 25.00 0_960 0.006 4 3/06/03 18:00 0.006 3 10.0� 0.900 0.000 8 12/23/03 16:00 0.006 4 5.00 0.800 0.004 6 1/05/05 8:00 0.005 5 3.00 0.667 0.006 3 1/18/06 21:00 0.004 6 2.00 0.500 0.005 5 11/24/06 3:00 0.002 7 1.30 0.231 O.Ola 1 1/09/08 9:00 0.000 8 1.10 0.091 Computed Peaks 0.009 50.00 0.980 � 1ot13.tsf - Lot 13 uader developed conditions/D7o deteation Flow Frequency Analysis Time Series File:lotl3.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 0.019 5 2/�9/O1 2:00 0.038 1 100.00 0.990 0.014 7 1/05/02 16:00 0.022 2 25.00 0.960 0.022 2 2/27/03 7:00 0.020 3 10.00 0.900 0.014 8 8/26/04 2:00 0.019 4 5.00 0.800 0.017 6 10/28/04 16:00 0_019 5 3.00 0.667 0.019 4 1/18/06 16:00 0.017 6 2.00 0.500 0.020 3 10/26/06 0:00 0.014 7 1.30 0.231 0.038 1 1/09/08 6:00 0.014 8 1.10 0.091 Computed Peaks 0.033 50.00 0.980 Petro V'uta 7TR-Novemlxr 2004 _� Hydrology Assessment of Oasite Wetland texwet.tsf - Total contributory area to wetland including offsite and onsite basins under existing coaditioas Flow Frequency Analysis Time Series File:teaovet.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 0.595 3 2/09/O1 15:00 ,�,11 1 100.00 0.99U 0.344 7 1/05/02 16:00 0:647 2 25.00 0.960 0.647 2 2/27/03 7:00 0.595 3 10.00 0.900 0.255 8 8/26/04 2:00 0.586 4 5.00 0.800 0.349 6 1/05/05 8:00 0.530 5 3.00 0.667 0.586 4 1/18/06 16:00 0.349 6 2.Od 0.500 0.530 5 11/24/06 3:00 0.344 7 1.30 0.231 1.1Z 1 1/09/08 6:00 0.255 8 1.10 0.091 Computed Peaks 0.955 50.00 0_980 tfuwet.tsf - Total coatributory area to wetland including offsite and oasite basins under future Droyosed conditioas Flow Frequency Anaiysis Time Series File:tfuvret.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 0.543 4 2/09/O1 2:00 1.09 1 100.00 0.990 0.359 7 1/05/02 16:00 0.638 2 25.00 0.960 0.638 2 2/27/03 7:00 0.561 3 10_00 0.900 0.307 8 8/26/04 2:00 0.543 4 5.00 0.800 0.378 6 10/28/04 16:00 0.515 5 3.00 0.667 0.561 3 1/18/06 16:00 0.378 6 2.00 0.500 0.515 5 11/24/06 3:00 0.359 7 1.30 Q.231 1.09 1 1/09/08 6:00 0.307 8 1.10 0.091 Computed Peaks 0.936 50.00 0.980 Petm V'rsta 71R-Nav�m6rr2004 � Appendix B.3 Sand Filter Sizing Retention/Detention Facility Type of Facility: Gravel Infiltration Trench Facility Length: 40.00 ft Facility Width: 20.00 ft Facility Area: 800. sq. ft Effective Storage Depth: 1.00 ft Stage 0 Elevation: 406.00 ft Storage Volume: 240. cu. ft Vertical Permeability: 45.00 min/in Permeable Surfaces: Bottom Riser Head: 1.00 ft Riser Diameter: 18.00 inches Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation ' (ft) (ft) (cu. ft) (ac-ft) (cfs) (cfs) 0.00 406.00 0. 0.000 0.000 0.02 0.05 406.05 12. 0_000 0.000 0.02 0.10 406.10 24. 0.001 0.000 0.02 0.15 406.15 36. 0.001 0.000 0.02 0.20 406.20 48. 0.001 0.000 0.02 0.25 406.25 60. 0.001 0.000 0.02 0.30 406.30 72. 0.002 0.000 0.02 0.35 406.35 84. 0.002 0.000 0.02 ° 0.40 406.40 96. 0_002 0.000 0.02 0.45 406.45 108. 0.002 0.000 0.02 ! 0.50 406.50 120. 0.003 0.000 0.02 0.55 406.55 132. 0.003 0.000 0.02 I 0.60 406.60 144. 0.003 0.000 0.02 0.65 406.65 156. 0.004 0.000 0.02 0.70 406.70 168. 0.004 0.000 0.02 0.75 406.75 180. 0.004 0.000 0.02 0.80 406.80 192. 0.004 0.000 0.02 0.85 406.85 204. 0.005 0.000 0.02 0.90 406.90 216. 0.005 0.000 0.02 0.95 406.95 228. 0.005 0.000 0.02 1.00 407.00 240. 0.006 0.000 0.02 1.10 407.10 240. 0.006 0.462 0.02 1.20 407.20 240. 0.006 1.310 0.02 1.30 407.30 240. 0.006 2.400 0.02 1.40 407.40 240. 0.006 3.700 0.02 1.50 407.50 240. 0.006 5.160 0.02 1.60 407.60 240. 0.006 6.590 0.02 1.70 407.70 240. 0.006 7.120 0.02 1.80 407.80 240. 0.006 7.610 0.02 1.90 407.90 240. 0.006 8.070 0.02 2.00 408.00 240. 0.006 8.51Q 0.02 2.10 408.10 240. 0.006 8.920 0.02 2.20 408.20 240. 0.006 9.320 0.02 2.30 408.30 240. 0.006 9.700 0.02 2.40 408.40 240. 0.006 10.070 0.02 2.50 408.50 240. 0.006 10.420 0.02 2.60 408.60 240. 0.006 10.760 0.02 2.70 408.70 240. O.Oa6 11.100 0.02 Pcrro V'u7a77R-No►+ember2004 � 2.80 408.80 240. 0.006 11.420 0.02 2.90 408.90 240. 0.006 11.730 0.02 3 .00 409.00 240. 0.006 12.030 0.02 Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (Cu-Ft) (Ac-Ft} 1 0.04 ******* 0.00 1.00 407.00 240. 0.006 2 0.02 ******* 0.00 0.00 406.00 0. 0.000 3 0.02 ******* 0.00 0.01 406.01 1_ 0.000 4 0.02 ******* 0.00 0.00 406.00 0_ 0.000 5 0.03 ******* 0.01 1.00 407.00 240. 0.006 6 0.04 ******* 0.01 1.00 407.00 240. 0.006 7 0.04 ******* 0.02 1.01 407.01 240_ 0.006 8 0.00 ******* 0.00 -0.01 405.99 Q. 0.000 ---------------------------------- Route Time Series through Facility Inflow Time Series File:levlout.tsf Outflow Time Series File:sfout.tsf Inflow/Outflow Analysis Peak Inflow Discharge: 0.715 CFS at 9:00 on Jan 9 in Year 8 Peak Outflow Discharge: 0.686 CFS at 9:00 on Jan 9 in Year 8 Peak Reservoir Stage: 1.13 Ft Peak Reservoir Elev: 407.13 Ft Peak Reservoir Storage: 240. Cu-Ft . �.006 Ac-Ft Flow Frequency Analysis Time Series File:sfout.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 0_284 2 2/09/O1 15:U0 0.686 1.13 1 100.00 0.990 0.014 6 1/07/02 2:00 0.284 1.06 2 25.00 0.960 0.035 4 3/06/03 22:00 0.042 1.01 3 10.00 0.900 Q.005 8 8/27/04 16:00 0.035 1.01 4 5_00 0.800 0.012 7 11/17/04 18:00 0.030 1.01 5 3.00 0.667 0.030 5 1/19/06 4:00 0.014 1.00 6 2_00 0.500 0.042 3 11/24/06 8:00 0.012 1.00 7 1.30 0.231 0.686 1 1/09/08 9:00 0.005 1.U0 8 1.10 0.091 Computed Peaks 0.552 1.11 50_00 0.980 Compute VOLiJME Discharge ----------------------- Loading Time Series File:sfout.tsf . Converting Stage to Discharge TSF 0 ' Discharge Volume Discharge Volume from Time Series sfout.tsf between 10/O1/00 00:00 and 09/30/08 23:59 147006. Cu-Ft or 3.375 Ac-Ft in 2920.0 days Discharge Volume File:sfout.prn . Compute VOLUME Discharge ------------------------ Loading Time Series File:dev.tsf . Discharge Volume Pttro Vicra 77R-Novtmbtr 2004 ---------------- Discharge Volume from Time Series dev.tsf between 10/O1/00 00:00 and 09/30/08 23:59 �512461. Cu-Ft or 34.721 Ac-Ft in 2920.0 days 55 2S 2— Discharge Volume File:dev.prn _ Volume into and Filter = 34.71 Ac-ft Volume not treated = 3 .38 Ac-ft j • � y� Percent of Average Annual Volume Treated = 90$ y',�' , f- � i�2-E� �CLi-t L�Clit C�S � ��G�y !'�� G�pQ' �'-' � %��?a,�i a-,�r �,,o� ,L/C S GUl�/�I . .....- G� � D�� Petro Vista TTR—November 2Q04 .- ; Appendix B.4 Hydrologic Assessment of Onsite Wetland Existing and Developed Onsite Wetland Basin Conditions �`�y� %� L�.��t�. f.5'� � E�sting Conditions C�(/t.� -��%l�� Till- Till- � Subbasins KCRTS forest pasture Wetland ,�� ' �. Basin AC (AC) (AC) � ' Onsite Area 2.93 0.12 Offsite Area 1.60 � Total 4.53 0.12 1 Developed �.-F'�we f, Conditions Till- Till- Till- Subbasins KCRTS forest pasture Wetland grass Imperv. Total Basin (A (A (AC� (AC (AC) (A Onsite Area 0.95 0.12 0.12 0.25 1.44 Offsite Area 1.60 1.65 0.85 4.10 � Total 1.60 0.12 1.77 1.10 5.54 I Predtcted Peak Flow Rates and Runoff Volumes II� Basin Condition �Year Peak 10-Year Peak lOQ-Year Peak Average Annual (CFS) (CFS) (CFS) Runoff Volume (AC- , Existin 0.06 0.10 0.18 1.25 I Develo d 0.07 0.09 0.14 0.74 � �� S��yrG D� ,i ��., � �� ,;��' �°�i�� C.- :��a . �� g �l I ��f �� Petro V'tsta 77R-Novtmber 2AP4 �`�'� f � s ,�..-.. 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN � Enclosed within this section are typical calculations necessary for the sizing of the pipe facilities proposed in this project. The Rational Method and Manning's formula were used for the sizing purposes. Com�eyance pipes have been sized to accommodate the ]00-year storm event at a flowing full condition. The intent of the pipe system within this development is to convey ' stormwater into the detention and water quality facility located within Tract A. The proposed facilities have not been sized to accommodate any off-site development. � ;l , � 11011.004.doc(DED/dm] � 5.1 25-Year and 100-Year Conveyance Calculations and Map 110 xls BARGHAUSEN CONSULTING ENGINEERS-PIPE FLOW CALCULATOR using the Rational Method&Manning Formula KING COUNTY DESIGN FOR 25 YEAR STORM JOB NAME: Petro Vista NOTE:ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING JOB#: 11011 DEFAULTS C= 0.7 n= 0.012 REVISED: 2/8/2005 d= 12 Tc= 6.3 A=Contributing Area(Ac) Qd=Design Flow(cfs) COEFFICIENTS FOR THE RATIONAL METHOD"Ir"-EQUATION C=Runoff Coefficient Qf=Full Capacity Flow(cfs) STORM Ar Br Tc=Time of Conceniration(min) Vd=Velocity at Design Flow(fps) 2YR 1.58 0.58 1=Intensity at Tc(In/hr) Vf=Velocity at Full Flow(fps) lOYR 2.44 0,64 PRECIP= 3.4 d=Diameter of Pipe(in) s=Slope of pipe(%) 25YR 2.66 0.65 Ar= 2.66 L=Length of Pipe(ff) n=Manning Roughness Coefficient 50YR 2.75 0.65 Br= 0.65 D=Water Depth at 9d(In) Tt=Travel Time at Vd(min) 100YR 2,61 0.63 FROM TO A s L d Tc n C SUM A A'C SUM A'C I Qd Qf ed/Hf D/d D Vf Vd Tt CB5 C84 0.05 1.00 24 12 6.3 0.012 0.85 0.05 0.04 0.04 2,73 0.12 3.86 0.030 0.120 1.44 4.92 2.19 0.18 C64 CB3 0.40 6.87 99 12 6.5 0.012 0.7 0.45 0.28 0.32 2.68 0.87 10.11 0.086 0.196 2.35 12.89 7,35 0.22 C63 CB2 0.21 2.13 83 12 6.7 0.012 0.7 0.66 0.15 0.47 2.62 1.23 5.63 0.219 0.315 3.78 7.18 5.72 0.24 C82 CBl 0.76 2,08 24 12 6.9 0.012 0.7 1.42 0.53 1.00 2.57 2.57 5.56 0.462 0.478 5.74 7.09 7.01 0.06 CBl VAULT 0.59 9.58 26 12 7.0 0.012 0.7 2.01 0.41 1.41 2.55 3.61 11.94 0.302 0.376 4.51 15.22 13.31 0.03 DITCH CB11 0.50 19.68 13 12 6.3 0.012 0.8 0.5 0.40 0.40 2.73 1.09 17.12 0.064 0.172 2.06 21.81 12.08 0.02 CBII CB10 0.00 7.43 229 12 6.3 0.012 0.9 0.5 0.00 0.40 2.73 1.09 10.52 0.104 0.219 2.63 13.40 8.62 0.44 CB10 C69 0,08 6.21 39 12 6.8 0.012 0.9 0.58 0.07 0.47 2.61 1.23 9.61 0.128 0.243 2.91 12.25 8.33 0.08 C69 DITCH 0.04 0.50 19 12 6.8 0.012 0.9 0.62 0.04 0.51 2.59 1.32 2.73 0.483 0.490 5.88 3.48 3.47 0.09 CB8 CB7 3.23 0.50 85 12 15.0 0.012 0.45 3.23 1.45 1.45 1.56 2.26 2.73 0.829 0.694 8.32 3.48 3.88 0.36 CB7 CB6 0.00 5.49 47 12 15.4 0.012 0.7 3.23 0.00 1.45 1.53 2.23 9.04 0.246 0.337 4.04 11.52 9.52 0.08 � ,� p O� � �m �� w � ,�� O m m�� cp i �� C � � � rn � Page 1 110 .xls BARGHAUSEN CONSULTING ENGINEERS-PIPE FLOW CALCULATOR using the Rational Method&Manning Formula KING COUNTY DESIGN FOR 100 YEAR STORM JOB NAME: Petro Vista NOTE:ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING JOB#: 11011 DEFAULTS C= 0.7 n= 0.012 REVISED: 2/8/2005 d= 12 Tc= 6.3 A=Contributing Area(Ac) Qd=Design flow(cfs) COEFFICIENTS FOR THE RATIONAL METHOD"Ir"-E9UATION C=Runoff Coefficient Qf=Full Capacity Flow(cfs) STORM Ar Br Tc=Time of Concentratlon(min) Vd=Velocity at Design Flow(fps) 2YR 1.58 0.58 1=Intensity at Tc(in/hr) Vf=Velocity at Full Flow(fps) lOYR 2.44 0.64 PRECIP= 3.9 d=Diameter of Pipe(in) s=Slope of pipe(%) 25YR 2.66 0.65 Ar= 2.61 L=Length of Pipe(ff) n=Manning Roughness Coefficient 50YR 2.75 0.65 Br= 0.63 D=Water Depth at Qd(in) Tt=Travel Time at Vd(min) 100YR 2.61 0.63 FROM TO A s L d Tc n C SUM A A'C SUM A'C I Qd Qf 61d/61( D/d D Vf Vd Tt CB5 C84 0.05 1.00 24 12 6.3 0.012 0.85 0.05 0.04 0.04 3.19 0.14 3.86 0.035 0.130 1.56 4.92 2.19 0.18 C64 CB3 0.40 6.87 99 12 6.5 0.012 0.7 0.45 0.28 0.32 3.14 1.01 10.11 0.100 0.213 2.56 12.89 8.14 0.20 C63 CB2 0.21 2.13 83 12 6.7 0.012 0.7 0.66 0.15 0.47 3.08 1.44 5.63 0.256 0.345 4.14 7.18 6.00 0.23 C82 CBl 0.76 2.08 24 12 6.9 0.012 0.7 1.42 0.53 1.00 3.01 3,01 5.56 0.542 0.524 6.29 7.09 7.22 0.06 CBl VAULT 0.59 9.58 26 12 7,0 0.012 0.7 2.01 0.41 1.41 3,00 4.24 11.94 0.355 0.411 4.94 15.22 13.94 0.03 DITCH CB11 0.50 19.68 13 12 6.3 0.012 0.8 0.5 0.40 0.40 3.19 1.28 17.12 0.075 0.185 2.22 21.81 12.43 0.02 CB11 CB10 0,00 7.43 229 12 6.3 0.012 0.9 0.5 0.00 0.40 3.19 1.27 10.52 0.121 0.237 2.84 13.40 8.96 0.43 CB10 C89 0.08 6.21 39 12 6.7 0.012 0.9 0.58 0.07 0.47 3.06 1.44 9.61 0.150 0.260 3.12 12.25 8.76 0.07 CB9 DITCH 0.04 0,50 19 12 6.8 0.012 0.9 0.62 0.04 0,51 3.04 1.54 2.73 0.566 0.537 6.45 3.48 3,57 0.09 CB8 CB7 3.23 0.50 85 12 15.0 0.012 0,45 3.23 1.45 1.45 1.85 2.69 2.73 0.985 0.804 9.64 3.48 3.93 0.36 CB7 CB6 0.00 5.49 47 12 15.4 0.012 0.7 3.23 0.00 1.45 1.82 2.65 9.04 0.293 0.370 4.44 11.52 10.00 0.08 r'� � n v� r�n ,� c L, ao � � �c � � �� C �� o m ��e , � � CONVEYANCE AREA MAP � � � sEc„ar��p�r�rrM�a easr,wu�rre�N � . � �� IaVO COl1NTY,3TATE OF WASFNqTON , � ;; .:, T�00' ,.. o ' I . , ,. __ � . �� ` • .: . : -...,, _. _...._..__ _. , � � � . 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I . .. _ ...: .. .__ ' .... , . ,... .- 6.1 Geotechnical Engineering Study Prepared by E3RA, Inc., dated August 11, 2004 L / ;:, �.ir L � � �_ � GEOTEC�iNIC�L ENGINEERING REPORT :_ PETRO VISTA DEVELOPMENT SE INTERSECTION 118TH AVE SE AIVD ' PETROVITSKY ROAD L RENTON, WASHINGTON �_ � , Submitted to: �L Bennett Development, Inc. ; 12011 NE lst Street, Suite 309 `- Bellevue, WA 98005 � � � i ,_ Submitted by: E3RA, Inc. �_ PO Box 44890 Tacoma, WA 98444 � � ' August 11, 2004 � .�� .t�, : — �� -��'�� ' • ; {','Y ,p h y'�ty .r�a�� '� — � : 1 . - �#*��j r# f Xc ' :;F _,, .. _ i i.- �;� .;s' �, _Y� � . 3,,._ .�,r . .aF' �- +"w,� } -�.'sr� �•' ti r� � �K T 1_�.� �_..�x ::4Z...- I 3�1 � _ ---� � � . � GEOTECHNICAL ENGINEERING �2EPORT PETRO VISTA DEVELOPMENT SE INTERSECTION 118TH AVE SE AND PETROVITSKY ROAD RENTON, WA5HINGTON Submitted to: Bennett Development, Inc. 12011 NE lst Street, Suite 309 Bellevue, WA 98005 � � Submitted by: E3RA, Inc. PO Box 44890 Tacoma, WA 98444 �f�� .��;�: ��, � �=r��a � August 11, 2004 �} ,�, ,� � �` '� T04116B � �y.� Y �� u. �{�" . r . . � . �� " �, ;� .�` , A�,�-�� h��= ` ', � ��, � ,�. � � ��=' _ - ' ; , , PO Box 44890 Tacoma WA 98444 253-537-9400 253-537-9401 fax ,} E3 RA August 11,2004 Bennett Development Inc. 12011 NE l s' Street Suite 349 Bellewe, Washington 98005 Attention: Bob Ehrlichman Subject: Geotechnical Engineering Report Petro Vista Development Southeast Intersection 118`h Avenue SE and Petrovitsky Road Renton, Washington Dear Bob: E3RA is pleased to submit this report describing ihe results of our geotechnical engineering eval�ation for the proposed Petro Vista residential development to be located in Renton, Washington. The purpose of our evaluation is to address the King County's Critical Areas Ordinances as they relate to erosion and landslide ' hazards and to �provide conclusions and recommendations regarding construction of the proposed � improvements on the project site. As outlined in our proposal letter,our scope of work comprised site reconnaissance,subsurface explorations, geotechnical research,and geotechnicat engineering analysis. This report has been prepared for the exclusive use of Bennett Development and their consultants,for specific application to this project,in accordance with generally accepted geotechnica! engineering practice. 1.0 SITE AND PROJECT DESCRIPTION The project site is a roughly rectangular parcel that measures about 230 by 600 feet and is located at the southeast intersection of 118'�' Avenve SE a��d Petrovitsky Road in Renton, Washington, as shown on the enclosed Location Map(Figure 1). The parcel is bordered by residential properties to the north,west, and south and by a power line right-of-way to the east. We understand tliat 22 sin�le-family residences are planned for the site.Several areas will remain undeveloped. These include wetlands on the east boundary and a��vetland and other grounds on the north boundary of the site. Plans call for the e�tension of a roadway east from 118`''Avenue SE through the center of the site. Residences will be located mostly south of tlie road�vay,but several residences will be constructed northwest and northeast offof the roadway alignment. 2.0 EXPLORATORY NIETHODS We explored s�rface and subsurface conditions at the project site on August 3,2004.Our exploration program comprised the follo�ving elements: 2 . • August 11, 2004 E3RA, Inc. T04116B/Petrovista Geotechnical Report • A surface reconnaissance of the site; • Nine test pits(designated TP-1 through TP-9), advanced across the site; and • A review of published geologic and seismologic maps and literature. Table 1 summarizes the approximate functional locations and termination depths of our subsurface explorations, and Figure 2 depicts their approximate relative locations. The following text sections describe the procedures used for excavation of test pits. TABLE 1 APPROXIMATE LOCATIONS AND DEPTHS OF EXPLORATIONS Terminatio n Elevation Depth Exploratioo Fuoctional Location (feet) (feet) TP-1 Low part Lot 19 412 8'/� TP-2 Lot 2 434 8 TP-3 Lot 5 428 7 TP-4 Top of slope Lot 8 410 8 TP-5 Lot 22 � 424 9 TP-6 Lot 18,edge of driveway 410 5'/� TP-7 Lot 14, central fill area 412 6 TP-8 Lot 11,edge of fill area 412 6'/z TP-9 West edge old foundation 434 5 'I Elevation datum: Site plan The specific number and locations of our explorations were selected in relation to the eristing site features, under the constraints of surface access,underground utility conflicts,and budget considerations. We estimated the relative location of each exploration. Consequently,the data listed in Table I and the locations depicted on Figure 2 should be considered accurate only to the degree permitted by our data sources and implied by our measuring methods. I� It should be realized that the explorations performed and utilized for this evaluation reveal subsurface I conditions only at discrete locations across the project site and that actual conditions in other areas could vary. Furthennore, tt�e nature and extent of any such variations would not become evident until additional explorations are perforn�ed or until construction activities liave begun. If significant variations are observed at that time,�ve may need to modify our conclusions and recommendations contained in this report to reflect the actual site conditions. 2.1 Test Pit Procedures Our exploratory test pits were excavated with a track-mounted excavator by an owner-operator under subcontract to E3RA. A geologist from our firm observed the test pit excavations and logged the subsurface conditions. 3 � , � August 11, 2004 E3RA, Inc. T04116B/Petrovista Geotechnical Report In our opinion, test pits are one of the preferred methods of exploration. Test pits,which are 6 to 10 feet in length,provide a continuous, broad,and more detailed picture of near-surface soil conditions than typically provided by 2-inch-diameter auger borings,which provide samples at 2'/z to 5 feet intervals and are extremety nanow in range. This is particulariy important in landslide areas where narrow slip planes can often go undetected by auger borings. The enclosed Test Pit Logs indicate tl�e vertical sequence of soils and materials encountered in each test pit, based o�i our fietd classifcations. Where a soit contact was observed to be gradational or undulating,our logs indicate the average contact depth. We estimated the relative density and consistency of the in-situ soils by means of the excavation characteristics and the stability of the test pit sidewalls. Our logs also indicate the approximate depths of any sidewall caving or groundwater seepage observed in the test pits. 3.0 SITE CONDITIONS The following sections oftext present our observations,measurements,findings,and interpretations regarding, surface, soil, ground��ater, seismic, and liquefaction conditions. 3.1 Surface Conditions Generally, site topography is variabte, undulating somewhat from uplands in the south�vest to a lo�v-lying wetland along the east boundary.The southwest upland slopes down to the northeast at grades of about 25 to 30 percent over an elevation change of about 25 feet. The central and northwest parts of the site are lowlands, most of which will not be developed. Grades rise 8 to 10 feet in elevation from the east part of the central lowland to form a low ridge that trends north-south.Grades then descend to the east from the low-lying ridge to a wetland that occupies the east ]Spercent or so of the site. An excavation business with a modular office building, sheds, and a garage/shop, occupy much of the low ; ridge on the east half of the site.A septic system there provides sewage treatment for the of�ice. A driveway with a turn around and a graveled equipment storage area,apparently constructed on fill soils, is also part of the excavation business_ An old building foundation,with a concrete slab floor and concrete sidewalk,occupies part of the soutliwest upland. Some small pieces of l�ousehold trash are scattered in the vicinity of the old foundation. An overgro��n drive��ay extends a short distance from the 118�'Avenue SE toward the old foundation. Vegetation onsite consists of scattered alder,fir,a�id maples with an under story of thick blackberries on the upland parts of tlie site. Vegetation on the wetlands parts of the site consists of large cottonwoods witli some willows and alders with a brushy under story. A small creek traverses tl�e wetlands near the east boundary. No otlier streams or streambeds were observed. No gullies,rills,or other indications of surface erosion,were observed.No surface expressions ofground�vater, such as seeps or springs,�vere noted. No surface features indicating unstable slopes,sucli as slumps, scarps, or tension cracks, were observed. 3.2 Soil Conditions Our on-site explorations revealed that native soils on upland parts ofthe site consist mostly ofglacial till and soils ai lo�vland parts of the site consist of glacial outwash. Both soil types I�ave a loose, upper weathered layer. 4 I • August 11, 2004 E3RA, Inc. T04116B/Petrovista Geotechnical Report ; r-�> In test pit TP-I,located on the lowland azea on the northwest part ofthe site,we observed a dense, 1 foot thick cap of fill consisting of silty,gravelly sand overlyi�g a'/�foot thick organic layer.Underlying the organic layer, we observed a foot of loose,weathered glacial outwash consisting of sandy gravel with some silt. At a depth of 2%z feet, we encountered dense,unweathered gravelly glacial outwash with few fines. In test pits TP-2, and TP-3, located on the southwest upland, we observed 6 inches of forest duff overlying 3 to 4 feet of loose,weathered glacial till consisting of silty, gravelly sa��d. 1fie�veathered ti11 observed in test pit TP-3 was rich in tree roots. Underlying the weathered glacial till layer, we observed very dense unweathered glacial till consisting of silty,gravelly sand with some cobbles. I In test pit TP-9, tocated adjacent to the old foundation on the southwest upland, we observed 6 inches of concrete sidewalk overlying 3 feet of loose,weathered glaciat tifl which in tum overlies dense to very dense, unweathered glacial till. In test pits TP-4 and TP-5, located in central and northwest lowland areas,respectively,we observed about l foot of forest duf�'overlying 2'/� feet of loose, weathered, gravelly glacial outwash with a significant fines content. Underlying the weathered outwash layer, at a depth of 3'/z feet and extending to the exploration terminus,we observed dense, unweathered,gravelly,glacial outwash with few fines. In test pit TP-6, located on tlie edge of driveway for the excavation company on the low-lying ridge, we observed 6 inches of forest duff overlying 3 feet of root-rich weathered glacial till. We noted unweathered, ' dense glacial till at a depth of 3'/� feet. Both till types are similar in consistency to the weathered and unweathered glacial till described above. i Test pits TP-7 and TP-8 were excavated into fill placed for roadways and equipment storage for the excavating business. In TP-7,located on the soutll edge of a roadway/turu around area,we encountered 3 feet ofdense fill consisting of silty, sandy gravel with some cobbles. Underlying the fill layer, we observed dense, native, unweathered, glacial outwash consisting sandy gravel with few fines. No organic horizon was observed separating fill and native soils. Test pit TP-8, eYcavated on tl�e west edge of tlie fill area, «�e observed 2 feet of fill soils consisting of toose silty,gravelly sand overlying a 6 inch thick organic-rich layer. Underlying the organic layer,�ve observed a 2 %z foot thick layer of native, loose,weathered glacial outwash consisting of silty,sandy gravel. Dense glacial outwash was observed at depths greater than 5 feet. The Geologic Map for South King County identifies soils onsite as glacial till deposited during the Vashon Stade of the Fraser Glaciation. As indicated above, we observed glacial till at higher elevations and glacial outwash at lower elevations. The Sor!Coliservation Surrey(SCS�for King County identifies soils on thepart of the site to be developed as AgC, Aldenvood gravelly, sandy loam, formed in glacial till. Tlle SCS identifies soils in the wetlands areas Sk, Seattle muck, formed in poorly drained depressions on glacial till plains. The SCS indicates that the erosion hazard for AgC soils is moderate and that they do not present severe lirnitations to building foundation and shallow excavations due to slope conditions. However il�e erosion I�azard for Alderwood soils on slopes greater than 15 percent is severe and they do present severe limitations to building foundation and shallow excavations due to slope conditions. 5 � . , � ',,; August 11, 2004 E3RA, Inc. , T041166/Petrovista Geotechnical Report � � � : The enclosed exploration logs provide a detailed description of the soil strata encountered in our subsurface ' explorations. 3.3 Groundwater Conditions At the time of our reconnaissance and explorations(August 3,2004),we did not observe groundwater in any of our subsurface explorations,nor did we note surface expressions ofgroundwater,such as seeps or springs. We � do not expect that significant quantities of groundwater will be encountered in excavations for the proposed ' residences. At all times of the year groundwater levels would likely fluctuate in response to precipitation patterns,of�site construction activities,and site utilization. 3.4 Seismic Conditions Based on our analysis of subsurface exploration logs and our review of published geologic maps,we interpret the on-site soil conditions to correspond�vitli a seismic site class S�,as defined by Table 1615.1.5 of the 2003 International Buildi»g Code (IBC). According to the IBC,the site is Seismic Region 3. � 3.5 Liquefaction Potential Liquefaction is a sudden increase in pore water pressure and a sudden loss of soil shear strength caused by shear strains,as could result from an earthquake. Research has shown that saturated, loose sands with a fines (silt and clay)content less than about 25 percent are most susceptible to liquefaction. Our on-site subsurface explorations did not reveal saturated, loose,silty sand layers or lenses. } 4.0 CONCLUSIONS AND RECOMMENDATIONS , Development plans call for the construction of 22 single-family residences with an access road on the site.We offer the follo��+ing general geotechnical conclusions and recommendations concerning this project • Feasibilitv: Based on our field explorations,research,and analyses,the proposed construction appears feasib}e from a geotechnical standpoint, provided that the recommendations in Sectioi� 5 and in this report are followed. • Landslide Hazards:Our site reconnaissance and geologic research revealed no indication of past or recent slope instability. In our opinion,the site does not present a landslide hazard to tl�e proposed construction or to tl�e surrounding area. • Erosion Hazards: Tl�e site has been identified by the SCS as a moderate to severe erosion hazard. We recommend that erosion control measures, consisting of properly placed silt fences or straw bales and interceptor ditches,as described in Section 5.1, be implemented. • Buffers and Setbacks: In our opinion,based on our site observations, no buffers or setbacks are necessary due to slope and erosion conditions onsite. - Foundation Options: We recommend that the addition be founded on conventiona) spread footings that bear on subgrades consisting oforganic-free,native soils,that are medium dense or denser, or on properly compacted structural fill. Recommendations for spread footings, soils reuse,and structural fill are provided in Section 5. 6 . . August 11, 2004 E3RA, Inc. T04116B/Petrovista Geotechnical Report � • Floor Options:We recommend either wooden joist supported or concrete slab-on-grade floors for the proposed residences. Recommendations for slab-on-grade floors are included in Section 5. • Fill Soi1s: Our explorations indicate that organic materials were removed before the placement of fill soils on the south part ofthe excavation company grounds,artd that fill soils are densely compacted there. However, an organic layer underlies the west part of the construction company fili area, and the overlying 2 feet of fill soils placed there are not densely compacted.We recommend the stripping of fill soits on the west part of the fill area and removal ofthe underlying organic layer. Tl�e stripping offill should continue to the east until the previously placed fill becomes dense and the underlying organic ]ayer ends. The thin fill layer observed on the northwest part of the site should be removed during site preparation. • DrainaQe: We recommend perimeter drains for foundation footings. We do not recommend floor drains for the proposed residences. Drainage recommendations are included in Section 5. • Seismic Considerations: Based on our literature review and subsurface interpretations, we recommend that the project structural engineer use the following seismic parameters for design of buildings, retaining walls, and other site structures, as appropriate.• Design Parameter Value Acceleration Coefficient(1997 USGS/[JBC) 0.3 Seismic Region.(IBC) 3 Soil Profile Type(IBC) Sp • Subgrade Protection: The contractor should u�stall appropriate temporary drainage systems to keep�vater out ofthe construction areas,and should limit traffic over any subgrades prepared within these soils. The following text sections ofthis report present our specific geotechnical conclusions and recommendations concerning site preparation,spread footings,slab-on-grade floors,drainage,subgrade walls,and structural fill. The WSDOT Standard Specifications and Standard Plans cited herein refer to WSDOT publications M41-10, Standard Specificotions for Road, 13ridge, arrd Municipa!Construction, and M21-01, Standard Plans for Road, Bridge, and Municipal Construction, respectively. 4.1 Site Prenaration Preparation of the project site should involve demolition and ctea�i up,erosion control, temporary drainage, c(earing,stripping,cutting, filling,eYcavations, and subgrade compaction. Demolition a�id Clean-Up: The first step in site prcparation will likely consist of demolishing existing structures. Any associated underground structural elements or utilities,such as old footings,stemwalls,septic systems,and drainpipes, should be exhumed as part of this demolition operation_ I 7 , � August 11, 2004 E3RA, Inc. T0411661Petrovista Geotechnical Report �`� Erosion Control: Before new construction begins,an appropriate erosion control system should be installed. This system should collect and filter all surface run offthrough either silt fencing or a series ofproperly placed and secured straw bales. We anticipate a system of berms and drainage ditches around the construction area will provide an adequate collection system. lf silt fencing is seiected as a filter,this fencing fabric should meet the requirements of WSDOT Standard Specification 9-332 Table 3. In addition,silt fencing should embed a minimum of 6 inches below existing grade. If straw baling is used as a filter,bales should be secured to the ground so that they will not shift under the�veight of retained water. Regardless of the silt filter selected,an erosion control system requires occasional observation and maintenance. Specifically,holes in the filter and areas where tlie filter has shifted above ground surface should be replaced or repaired as soon as they are identified. Temporarv Draina�e: We recommend intercepting and diverting any potential sources of surface or near-surface water within the construction zone. Because the selection of an appropriate drainage system wil] depend on the water quairtity, season, weather conditions,construction sequence,and contractor's methods, final decisions regarding drainage systems are best made in the field at the time of construction. Based on our current understanding of the construction plans, surface and subsurface conditions, we anticipate that curbs, berms,or ditches placed around the work areas�vill adequateiy intercept surface water runoff: Clearing and Stripping: After surface and near-surface water sources have been controlled,the construction area should be cleared and stripped ofall duffand topsoil. Our explorations indicate that the duffand topsoil layer can be more a foot thick, but may be locally thicker. Also, it should be realized that if the stripping operation proceeds during wet weather, a generally greater stripping depth might be necessary to remove disturbed moisture-sensitive soils;therefore, stripping is best performed during a period of dry weather. Site Excavations: Based on our explorations,we expect that excavations on the upland part of the site will , encounter dense to very dense glacial till.Special rippers or teeth on excavation equipment might be necessary to rapidly excavate this soil. Dewaterin�:Our explorations did not encounter groundwater witliin their termination depths,nor do we expect that groundwater�vill be present in site excavations. However, if groundwater is encountered,we anticipate that an intemal system of ditches,sumpholes,and pumps will be adequate to temporarily de«�ater excavations. 'I�emporary Cut Slopes: Alt temporary soil slopes associated �rith site cutting or excavations should be adequately inclined to prevent sloughing and collapse.Temporary cut slopes in site soils should be no steeper than 1'/4 H:l V, and should conform to WISHA regulations. Sub�rade Compaction: Exposed subgrades for footings and floors should be compacted to a firm,unyielding state before new concrete or fill soils are placed. Any localized zones of looser granular soils observed within a subgrade should be compacted to a density commensurate �vith the surrounding soils. 1n contrast, any organic, soft, or pumping soils observed �vitl�in a subgrade should be overexcavated and replaced with a suitable structurat fill material_ Site Filline: Our coilclusions regarding the reuse of o�l-site soils and our comments regarding�vet-«�eather filling are presented subsequently. Regardless of soil type,all fill should be placed and compacted according to our recommendations presented in the Slrcrctural Fill section oftl�is report. Specifically,building pad fill soil sl�ould be compacted to a uniform density of at least 95 percent(based on ASTM:D-1557). On-Site Soils: We offer the following evaluation ofthese on-site soils in relation to potentia)use as structural fill: 8 -� . • i August 11, 2004 E3RA, Inc. T041166/Petrovista Geotechnical Report `�'�� • Su�cial Organic Soils: The duff and topsoil mantling the site is not suitable for use as �! structural fill under any circumstances, due to high organic content. Consequently, this material can be used only for non-structural purposes,such as in landscapuig areas. I • Weathered Glacial Till and Clacial Ourivash: The weathered glacial till and glacial ouhvash that underlies the mantling of duff and topsoil is reusable as structural fil l,provided that it is relatively root and organics free and that rock clasts larger than 6 inclies are removed. Currently, these soils are dry of optimum and will need wetting before placement and compactio�i.Ho«�ever,they are sensitive to moisture content variations and will be difficult or , impossible to reuse during wet weather conditions,due to their moderately high silt content. • Unwealhered Glacial Till: The unweathered glacial till that underlies upland parts ofthe site at depths of 3Y�to 4'/�feet is near the optimum moisture content and is currently reusable as structura)fill,provided that rock clasts larger than 6 inches are removed.However,this soil is sensitive to moisture content variations and will be dif�icult or impossible to reuse during wet weather conditions. • Unweathered Glacial Outwash: The unweathered glacial outwash that underlies lowland parts of the site at depths of 3 to 5 feet is near the optunum moisture content and is currently reusable as structural fill,provided that rocks larger than 6 inches are removed. This soil is relatively insensitive to moisture content variations and will be reusable during most��eather conditions. � • Fill Soils: The fill soils placed in the vicinity of the existing excavation bosiness are reusable as structural fill,provided they do not include the organic layer that partially vnderlies them. All rocks larger than 6 inches should be removed. However,this soil is sensitive to moisture content vaziations and will be difficult or impossible to reuse during wet weather conditions. The foot-thick surficial fill layer observed on the north�vest part of the site is reusable, but separation from the underlying organic layer may prove di�cult. All rocks larger than 6 inches should be removed. This soil is sensitive to moisture content variations and will be difficult or impossible to reuse during wet weather conditions. ' Permanent Slopes: All permanent cut slopes and fill slopes should be adequately inclined to reduce long-term , raveling,sloughing,and erosion. We generally recommend that no pennanent stopes be steeper than 2H:1 V. For all soil types, the use of flatter slopes (such as 2Y�H:1V) would further reduce long-tenn erosio�� and facilitate revegetation. Slope Protection: We recommend that a permanent benn,swa}e,or curb be constructed along the top edge of all permanent slopes to intercept surface flow. Also,a hardy vegetative groundcover should be established as soon as feasible,to further protect the slopes from runoff water erosion. Alternatively,pennanent slopes could be armored with quarry spalls or a geosynthetic erosion mat. 4.2 Spread Footin�s vi our opinion, conventional spread footings will provide adequate support for the proposed residential structure if the subgrades are properly prepared. Footin�Depths and Widths: For frost and erosion protection,the base of all exterior footings should bear at least 18 incl�es below adjacent outside grades,wt�ereas the base of interior footings need bear only 12 inches below the sunounding slab surface Ievel. To reduce post-construction settlements, continuous (wall) and 9 , • ' August 11, 2004 E3RA, Inc. , T041166/Petrovista Geotechnical Report ! � isolated(column) footings should be at least I 8 and 24 inches wide,respectively. Bearing Sube,rades Footings should bear on medium dense or denser, undisturbed native soils which have been stripped of surficial organic material,or on bearing pads of properly compacted structural fill that extend to medium dense or denser native soils. After stripping of organic soils,medium dense or denser native soils will lie 1 to 4 feet below existing grades. In general, before footing concrete is placed, any localized zones of loose soils exposed across the footing subgrades should be compacted to a firm, unyielding condition, and any localized zones of soft, organic,or debris-laden soils should be overexcavated and replaced with suitable structural fill. ' T.ateral Overexcavations: Because foundation stresses are transferred o�tward as well as downward into the bearing soiIs,all footing over excavations should extend horizontally ounvard from the edge of each footing. This horizontal distance should be eyual to the over excavation depth. Therefore, an over excavation that extends 24 inches below the footing base should also extend 24 inches outward from the footing edges I, Sub�rade Observation: All footing subgrades should consist of finn,unyielding,native soils or structura)fill I materials compacted to a density of at least 95 percent(based on ASTM:D-1557). Footings should never be cast atop loose,soft,or frozen soil,slough,debris,existing uncontrolled fill,or surfaces covered by standing water. Bearing Pressures: In our opinion,for static loading,footings that bear on properly prepared subgrades can be � designed for a ma�cimum allowable soil bearing pressure of 2,500 pounds per square foot(ps�. A one-third increase in allowable soil bearing capacity may be used for short-term loads created by seismic.or wi��d related � activities. Footin�Settlements:Assuming that structural fill soils are compacted to a medium dense or denser state,we estimate that total post-construction settlements of properly designed footings bearing on properly prepared subgrades will not exceed 1 uich. Differential settlements for comparably loaded elements may approach one- half of the actual total settlement over horizonta) distances of approximately 50 feet. Footin� Backfill: To provide erosion protection and lateral load resistance, we recommend tliat all footing excavations be backfilled on both sides of the footings and stemwalls after the concrete has cured. Either imported structural fill or non-organic on-site soits can be used for this purpose, contingent on suitable moisture content at the time of placement. Regardless of soil type, all footing backfill soil should be compacted to a density of at least 90 percent(based on ASTM:D-1557). Lateral Resistance: Footings that have been properly backfilled as recommended above will resist lateral movements by means ofpassive earth pressure and base friction. We recommend using an allowable passive earth pressure of 275 pounds per square foot for glacial till,reusable onsite fitl soil and glacial ounvash. We recommend an allowable base friction coefficient of 0.35 for all of the non-organic soils onsite. 4.3 Slab-On-Grade Floors In our opinion,soil-supported slab-on-grade floors can be used in tl�e proposed structure if the subgrades are properly prepared. We offer the following comments and recommendations concerning slab-on-grade floors. Floor Subbase: Structural fill subbases do not appear to be needed under soil-supported slab-on-grade floors. However, the final decision regarding the need for subbases should be based on actual subgrade conditions observed at the time of construction. If a subbase is needed,all subbase fil(should be compacted to a density of at least 95 percent(based on ASTM:D-1557). . 10 , . • :>.:;�:_ August 11, 2004 E3RA, Inc. T041166/Petrovista Geotechnical Report '^� Capillarv Break and Vapor Barrier: To retard the upward wicking of moisture from beneath the floor slab,we recommend that a capillary break be placed over the subgrade. Ideally,this capillary break would consist of a 4-inch-thick layer of pea gravel or other clean, unifonn, well-rounded gravel, such as "Gravel Backfill for Drains"per WSDOT Standard Specification 9-03.12(4),but clean angular gravel can be used if it adequately prevents capillary wicking. In addition,a layer of ptastic sheeting(such as Crosstuff,Visqueen,or Moistop) should be placed over the capillary break to serve as a vapor barrier.During subsequent casting of the concrete slab,the contractor should exercise care to avoid pnncturing this vapor barrier. 4.4 Draina�e Systems In our opinion,the proposed structure should be provided with permanent drainage systems to reduce the risk of future moisture problems.We offer the following recommendations and comments for drainage design and � construction purposes. Perimeter Dra'vls: We recommend that the residential buildings be encircled with a perimeter drain system to collect seepage water. This drain shou{d consist ofa 4-inch-diameter perforated pipe within an envelope of pea gravel or washed rock,extending at least 6 inches on all sides of the pipe,and the gravel envelope should be � wrapped with filter fabric to reduce the mib ation of fines from the surrounding soils. tdeally,the drain invett would be installed no more than 8 inches above the base of the perimeter footings. Subfloor Drains: Based on the groundwater conditions observed in our site explorations, we do not infer a need for subfloor drains. Dischar�e Considerations: lf possible,all perimeter drains should discharge to a sewer system or other suitable location by gravity flow. Check valves st�ould be installed along any drainpipes that discharge to a sewer � system,to prevent sewage backflow into the drain system. Runoff Water Roof-runoff and surface-runofF water should not discharge into the perimeter drain system. II _ Instead,these sources should discharge into separate tightline pipes and be routed away from the building to a I storm drain or other appropriate]ocation. ��, Grading and Capping: Final site grades should slope downward away from the buildings so that runoffwater will flow by gravity to suitable coilection points, rather than ponding near the building. Ideally, the area surrounding the building would be capped with concrete,asphalt,or low-permeability(silty)soils to minunize or preclude surface-water infiltration. 4.5 Sub�rade Wails We offer these recommendations for subgrade walls if a daylight basemendgarage is part of the building design: Wall Foundations: Subgrade��alls can be supported on shallow footings bearu�g on suitable soils as described in the Spread Footings section ofthis report. Footings sl�ould be designed using the recommended allowable , bearing pressures and lateral resistance values presented for building foundations Wall Draina�e: Groundwater drainage s}�ould be provided behind concrete walls by placing a zone of sand and gravel containing less than 3 perce��t fines(material passing No.200 sieve)abainst the wall. This drainage zone should be at least 24 inches�vide(measured horizontally)and extend from the base ofthe wall to within 1 foot of the finished grade behind the wall. Smooth-walled perforated PVC drainpipe having a minimum diameter of 4 inches should be embedded within the sand a�ld gravel at the base of Ihe wall along its entire length. This drainpipe should discharge into a tightline leading to an appropriate collection and disposal system. 11 � . • i August 11, 2004 E3RA, Inc. , T04116B/Petrovista Geotechnicai Report i . �"'•� Backf311 Soil: Ideally,all retaining wall backfill placed beh'vid the curtain drain would consist of clean,free- draining, granular material, such as "Gravel Backfill for Walls" per WSDOT Standard Specification 9- 03.12(2). Alternatively,on-site granular soils could be used as backfill if they are placed at a moisture content near optimum. In the event that silty soils are used as backfill, a geotextile should be placed between the drainage zone and the backfll soil to prevent drain clogging. Backftll Compaction: Because soil compactors place significant lateral pressures on subgrade �valls, we recommend that only small,hand-operated compaction equipment be used within 2 feet of a backfilled wall. Also, all backfill should be compacted to a density as close as possible to 90 percent of the maximum dry density(based on ASTM:D-1557);a greater degree of compaction closely behind the wall wouid increase the lateral earth pressure, wl�ereas a lesser degree of compaction might lead to excessive post-construction settlements. Grading and Capping: To retard the infiltration of surface water into the backfill soils,we recommend that the backfill surface of exterior walls be adequately sloped to drain away from the wall. Ideally,the backfill surface directly behind the wall would be capped with asphalt,concrete,or 12 inches of low-permeability(silty)soils to minimize or preclude surface water infiltration. Applied Soil Pressure: Walls that are designed to move 0.1 percent of the wall height during and after construction are usually referred to as unrestrained walls. We recommend that unrestrained cantilever walls supporting stopes inclined at 2H:1 V or flatter be designed to resist an active pressure(triangular distribution) of 55 pounds per cubic foot(pcf}. The recommended pressure does not include the effects of surcharges from surface loads hydrostatic pressures,or structural loads. Ifsuch surcharges are to apply,they should be added to the above design lateral pressures. i � 4.6 Structura!Fill The term "structural fill" refers to any placed under foundations, retaining walls, slab-on-grade floors, sidewalks, pavements, and other structures. Our comments, conclusions, and recommendations concerning structural fill are presented in the following paragraphs. Materials: Typical structural fill materials include clean sand, gravel,pea gravel,washed rock,crushed rock, well-graded mixtures ofsand a��d gravel (commonly called"gravel borrow"or"pit-run"),and miscellaneous mixtures of silt,sand,a��d gravel. Recycled asphalt,concrete,and glass,which are derived from pulverizing the parent materials,are also potentially useful as structural fill in certain applications. Soils used for structural fill should not contain any organic matter or debris,nor any individual particles greater than about 6 inches in diameter. Fill Placement: Clean sand,gravel, crushed rock, soil mixtures, and recycled materials should be placed in horizontal lifts not exceeding 8 inches in loose thickness,and each lift should be thoroughly compacted with a mechanica(compactor. Compaction Criteria: Using the Modified Proctor test (ASTM:D-1557) as a standard, we recommend that structural fill used for various oi�-site applications be compacted to the following minimum densities: Fill Application Minimum Compaction Footing subgrade and bearu�g pad 95 percent Foundatioil back�ll 90 percent Slab-on-grade floor subgrade and subbase 95 percent Subgrade wall backfill 90 percent 12 , � � . i,�St i: . .:%',:y..• August 11, 2004 E3RA, Inc. F� ��` , T041166/Petrovista Geotechnical Report � . ':w �v�.� Subgrade Observation and Compaction Testing: Regardless of material or location,all structural fill should be " placed over firm,unyielding subgrades prepared in accordance with the Site Preparation section ofthis report. The condition of all subgrades should be observed by geotechnical personnel before filling or construction ' begins. Also, fill soil compaction should be verified by means of in-place density tests performed during fill placement so that adequacy of soil compaction efforts may be evaluated as earthwork progresses. Soil Moisture Considerations: The suitability of soils used for strnctural fill depends primarily on their grain-size distribution and moisture content wlien they are placed. As the "fines" content(that soil fraction passing the U.S.No. 200 Sieve)increases,soils become more sensitive to small changes in moisture content. Soils containing more than about 5 percent fines (by weight) cannot be consistently compacted to a firm, unyielding condition when the moisture content is more than 2 percentage points above or below optimum. For fill placement during wet-weather site work, we recommend using"clean" fill,which refers to soils that have a fines content of 5 percent or less(by weight)based on the soil fraction passing the U.S.No.4 Sieve. 5.0 RECOMMENDED ADD1T10NAL SERVICES Because the future performance and integrity of the structural elements will depend largely on proper site preparation, drainage, fill placement, and construction procedures, monitoring and testing by experienced geotechnical personnel should be considered an integral part of tl�e construction process. Consequently,we recommend that E3RA be retained to provide the follo�ving post-report services: • Review all construction plans and specifications to verify that our design criteria presented in this report have been properly integrated into the design; • Prepare a letter summarizing all review comments(if required by King County); I • Check all completed subgrades for footings and slab-on-grade floors before concrete is ' poured, in order to verify their bearing capacity;and • Prepare a post-construction letter summarizing all field observations, inspections, and test results(if required by King County). 6.0 CLOSURE The conclusions and recommendations presented in this report are based, in part,on the explorations that we observed for this study;tlierefore,if variations in the subgrade conditions are observed at a later time,we may need to modify this report to reflect those changes. Also,because the future performance and integrity ofthe project elements depend largely on proper initial site preparation, drainage, and construction procedures, monitoring and testing by experienced geotechnica) personnel should be considered an integral part of the construction process. E3RA is available to provide geotechnical monitoring ofsoils throughout consiruction. 13 � s August 11, 2004 E3RA, Inc. T041166/Petrovista Geotechnical Report � We appreciate the opportunity to be ofservice on this project. Ifyou have any questions regardingthis report or any aspects ofthe project, please feel free to contact our office. SincereIy, E3RA,Inc. �%„ -. gR. 8� -:- �- � 2�Q. �i=--� .`� - . p``�' ,� � � �.-.'.: ; �'� � `I, / �^ `��'.`r\'. 1 � �"<'„_;`- - '�.' '� � �f' � "`- ,�; ��. Enqi�ez rq�ea,,� ,/',c;' /`; �PO� �� 41 �'�o�s 71 1 , f\��.,r" �8S O AL�O� ed G��/ �fl � r 1 G� � Fred Emest �ennebaum ; t� c�S�-► a -___ Fred E. Rennebaum, L.E_G. James E Brigham, P.E. Senior GeoIogist Principal Engineer FER/JEB Enclosures: Figure 1 — LocaFio»Map Figure 2 — Site&Explor•ation Plarr Test Pit Logs TP-1 through TP-9 I 14 � � s August,11,2004 E3RA, Inc. T04116B/Petrovista Geotechnical Report . �;. " TEST PIT LOGS—PETRO VISTA SITE z . - '� Depth(feet) Material Descriation Test Pit TP-1 Location: Low part of Lot 19 Approximate ground surface elevation:412 feet 0.0— 1.0 Dense,damp, light brown,silty,gravelly SAND with some cobbles(Fill)(SM). 1.0— 1.5 Organic L.ayer. 1.5—2.5 Loose to medium dense,damp,light brown,sandy GRAVEL with some silt and cobbles(Weathered Glacial Outwash)(GP-Glvn. 2.5—8.5 Dense,damp,light gray,sandy GRAVEL with trace silt and some cobbles(Unweathered Glacial Ouwash) (GP). No caving observed No groundwater encountered Tes[Pit TP-2 Location: Lot 2 Approximate ground surface elevation:434 feet 0.0—0.5 Duff and Topsoil. 0.5—3.0 Medium dense,damp, light brown,silty,gravelly SAND with some cobbles(Weathered Glacial Till) (SM). 3.0—8.0 Dense,damp,light brown,silty,gravelly SAND with some cobbles(Unweaihered Glacial Till)(SM). No caving observed No eroundwater encountered "I'est Pit TP-3 Location: Lot 5,top of slope Approximate ground surface etevation:428 feet 0.0—0.5 Duff and Topsoil. 0.5—4.5 Loose,damp, light brown,silty,gravelly SAND with some cobbles and some roots(Weathered Glacial Till)(SM). 4.5—7.0 Dense,damp,light brown,silty,gravelly SAND with some cobbles(Unweathered Glacial Till)(SM). No caving observed No groundwater encountered � . 15 I A � � . , _ � . . ' August 11, 2004 E3RA, Inc. . .. . � T041166/Petrovista Geotechnical Report � TEST PIT LOGS—PETRO VISTA SITE . I Depth ([eet) Material Descrintion Test Pit TP-0 Location: Base of slope,Lot 8 Approximate ground surface elevation:410 feet 0.0— 1.0 Duff. 1.0—3.5 Loose,damp,light brown,silty,sandy GRAVEL with some cobbles(Weathered Glacial Outwash)(GIvn. 3.5—8.0 Dense,damp,light gray,sandy GRAVEL with trace silt and some cobbles(Unweathered Glacial Ouwash) (GP). No caving observed No groundwater encountered Test Pit TP-5 Location: Lot 22 Approximate ground surface elevation:424 feet 0.0— 1.0 Duf�: 1.0—3.5 Loose,damp,light brown,sandy GRAVEL with some silt and cobbles(Weathered Glacial Outwash) (GM). 3.5—9.0 Dense,damp,light gray,sandy GRAVEL with trace silt and some cobbles(Unweathered Glacial Ouwash) �G P)- No caving observed No groundwater encountered • Test Pit TP-6 Location: Lot 18,edge of drive�vay Approximate ground surface elevation:410 feet 0.0—0.5 Duff and Topsoil. 0.5—4.0 Loose, damp,light brown,silty,gravelly SAND with some cobbles;very root-rich(Weathered Glacial Till) (SIvQ. 4.0—5.5 Dense,damp,light brown,silty,gravelly SAND with some cobbles(iJnweathered Glacial Till)(SM). No caving observed No groundwater encountered 16 , . , I _r ,, t, :' August 11,.2004,� E3RA, Inc. '=.T041166/Petrovista Geotechnical Report . ,. � �r �, 1 5y k ' � . , �, � �; ; TEST PIT LOGS— PETRO VISTA SITE < . � � ; _ , sDepth(inches� , Material Description ' Test Pit TP-7 Location:Lot 14, edge of graveled fill area Approximate ground surface elevation:412 feet 0.0—3.0 Dense,damp,light brown,sandy GRAVEL with some silt and cobbles(Fill)(GM). 3.0—6.0 Dense,damp,light gray,sandy GRAVEL with trace silt and some cobbies(tJnweathered Glacial Outwashj (GP). No caving observed No groundwater encountered Test Pit TP-8 Location: Edge of fill area,Lot 11 Approximate ground surface elevation:412 feet 0.0—2.0 Loose,damp,light brown,silty,gravelly SAND with some cobbles(Fill)(Slvi}. 2.0—2.5 Organic Layer. I 2.5—5.0 Loose,damp,light brown,silty,sandy GRAVEL with some cobbles(Weathered Glacial Outwash)(SIVn. i 5.5—6.5 Dense,damp,light gray,sandy GRAVEL with trace silt and some cobbles(Unweathered Glacial Ouwash (SM). No caving observed No groundwater encountered :-Test Pit TP-9 -=_Location: Adjacent to west side otd foundation Approximate ground surface elevation:434 feet 0.0—0.5 Concrete Sidewalk. 0.5—3.5 Loose,damp,light brown,silty,gravelly SAND with some cobbles(Weathered Glacial Till}(SM). 3.5—5.0 Dense,damp,light gray,silty,gravelly SAND with some cobbles(LJnweathered Glacial Till)Slvn. No caving observed No groundwater encountered Logged by FER on 8/3/04 . . 17 , ' , i . � ❑a T m 0 , TBM— o 0 11 _1 pL4:_ - r.��,....c'tJt::._�. . / _ _ _:=_� 131 '-- ' ' `-' �_:=s=.-:=:_-::_�.. .:.....:... � 10 YE FLO B�r f+ � �: � a I a�a __ _ ' _ e t O 7 1" -_ ._:� _' ; F'; 2� � 3e Wet i�nq �: ' e � ° €4,' - �: _ WzP � E E OF � _ _ � /' G VEL � tr� _ W �r � .e � � :> � _ w �6 ._�� . � � � - I d � ° � M�� AY � - = �'15' SEWER EASEMENT F �3 ` PER EASEMENTS 7910230 � . - M 30 Q�a a = � � 3 & 7910230740 , N i ♦ � __-----_- _ \e � � _ .. � , . .. � . fl_. � � � ' - � �' . � '� �p � - - - 23. �� - _ t:= , . p � � ._."-._L: :. '_'_'_"-�' sS; . . .�" o pR �`, `- ", EEL CULVQY! -_s:`.� =�I�: MI' BROKEN CON �l,� \ 86 �e��3229 � O1D FOUNDA ION Y� � �'--. � OOV� `\ ,\ . / - O � —1 �e� / r {�,� + o �ZOV .`�,� �nf� Vi oc—� _ Q G�� _��_ P CVLYERT m --�� , �`� '` �e=.a�ez � _2 � , 1551��' � �R PNSM � �1�8a20 n 30 g� p � a B � � `l i?�.�''.h. ►►� 1 32 gHE JECT: PETRO VISTA i�� N = SITE PLAN 60 0 60 IGNER: FER FIGURE 2 SCALE: 1" = 60' � BY: RBH SCALE: N/A CKED BY: RBH SHEET: 1 �: AUG 10, 2004 FILE:T04116B 6.2 Wetland Analysis Report Prepared by Wilterrr�ood Associates, Inc., dated September 20, 1999 i � . �W� 1 �� LYS�S ��Z� FOR AN APPRO�ATELY 4.0 ACRE PAR.CEL Located on Petrovitsky Road King County,Washington . Prepasr.d For. Dalc VanDerscbeldon 2I3(}8 Snag Island D,-ivt Esst Sumner,WA 98390 Prepar�d By Emmett Pritchard � �— � II �� a � I � Wiltermood Associates,Inc. 1015 SW Harper Road Port Orchard,WA 98367 (360) 876-2403 Sepfember 20,1999 � i . Tabfe of Contents PAGE Il�tTRODUCTIOl�I 1 METHODS 1 BACKGRDUND INFORMATION 3 King County Soil Survey 3 King CountpWctlands Inveatory 3 Priority Species 3 � WETI�AND ASSFSSMENT 3 _ Vegetation 4 Soils 4 Hyc#rology 5 Cov�rardin Ctassification 5 WetIand Class 5 Fanctional Values 5 Recommended Buffers 6 OFF-SITE'PVETLANDS 6 POTENITAL Il17PACTS QF DEVELOPMENT 7 SIIMMARY S LIMITATIONS S REFERENCES ' APPErIDICES INZRODUCTION � The delineated wetland discussed in this report is tocated on an approumately four acre parcel on Petrovitsky Road, K'ing County, Washington. The parcel is located in the Soos Creek sub-basin. See Appendiz A-1 for a vicinity map. The parcel is located in Section 23, T 23 N, R 5 E WM. This parcel is irregular in shape with the north parcel boundary formed by � Petrovitsky Road and the west boundary formed by 118m Ave. SE. An office building, equipment yard and 2 sheds are located on the eastem half of the pazcel. The remainder of the paroel is vegetated with a mized farest int�rspersed with small ` I clearings. An area just to the west of the equipment yard is dominated by HimaIayan � ; blackberry. This area slopes down from the yazd to a small basin that contains a I Class II wetland dominated by scmb/shnib vegetation with a developing forested I vegetation class. A second wetland is locafed off-site to the east of the parcel approximately 20 feet from the east parcel boundary. The off-site wetland boundary appears to run parallel to the east pazcel boundary ranging 30 to 50 feet from the parcel. This off-site weQaud meets critcria for Class II rcgulation by King County. METHODS � By definition, wetlands are 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 prevalenc�of vegetation typically adapted for Iife in saturated soil�conditions. WeQands are regulated nationally as 'Waters of the United States" by the U.S. Army Corps of Engineers, and locally by K'ing County, � Washington as per the Ring County Code: Chapter 21A.24, tifled, "�rrvironmentallY �ensikive Areus". 1 The wetland was delineated on Juty 26, 1999 using the Department of Ecalogy Washington State Wetlands Identifica6on and Delineation Manual and is Coasistent with the 1987 Corps of Engineers Wefland Delineation Manual. The Routine Determination Method as per the U.S. Atmy Corps of Enginaers, Wetland DeIineation Manual (198'7)was used. The Routine Determination Method examines three parameters-vegetation, hydrology and soils to determine if wetlands exist in a given area. Tt is the presence of hydrology which is critical in determining what is � � wetland, however, since hydrologic conditions can change periodically, it is necessary to determinc if b fdrophytic vcgctation or hydric soils exist which wouid indicate that water is present for long enough duration to support a wetland plant community. I Data was coIleded in the wetland and in the upland. Information on vegetation, hydrology and soils was collected. Soil test holes were completed to a depth of IS inches. At each test hole, a profile description, complete with tezture and color of the Iayers was recorded on the enclosed data forms. Soil chromas were determined using damp soil samples that were compared to a corresponding color chip in the Munsell Soil Color Charts. The chromas were then recorded on the data sheet using Hue (YR) and ValuelChroma. Any Hue and Value with a chroma of 1 wlth Or � without mottles or a chroma of 2 with mottles is typical of hydric{wetland) soils that have developed due to prolonged inundation ar saturation by water. . Background information for this report was provided by the King County Soil , Survey, the l�'ing County Wetlands Inventory and K�ing County Sensitive Areas Folio. � This report includes a discussion of the on-site wedands with respect to data collected 2 • ia the field and inciudes a we[land ciassification, a valnes and function analysis and a ', recommendation for regulation according to the King Covnty Wefland Regulations. BACKGROUND INFORMATION ' King Countv Soil Surve� The on-site soiis have been mapped as AgC Alderwood gravelly sandy loam, 6-15% slopes by the Soi1 Conservation Servioe, Soil Survey of King County Area, Washington; September, 1973. Alderwood soils are not classified as hydric; however they can contain hydric inclusions of Norma sandy Ioam, Bellin,gham silt loam, Shalcar muck, Seattle muck and T�kwila muck. See Appendiz A-3 for site located on soil survey and Appendix B for description of the mapped soil types. ' in n etland nven nd ea Ma F li � g COU ty W s I torv a Sen�bve Ar s p o 0 Sensitive Areas Map�5 indicates one wetland within 500 feet of the parcel. This ' wetland is namcd Soos Creek 2 in the inventory and is Iocat�d appraumateIy 500 feet ' east of the parcel. The wetland is described in the K'ing County Wetlands Inventory, Volume 3 South, 1990 as 134 acres in size with five vegeiatioa sub-classes. This ' wetland has been given a Class 1 wet3and rating in the King Coanty Wetlands Inventory and is protected by a 100 foot buffer. The wetland and its buffer do not cxtcnd onto the parcel. See Appendiz A-5 for wetland data form. , Prioritv Species I There are no Washington State Priority 1, 2, or 3 plant or animal species Irnown to I eust on the parcel (Wastungton Natural Heritage Program, 1991) nor were any ! identified during our field survey. The presence of priority species was determined using the printed edition and a data base search was not completed at this time. 3 � -� , WETL�IVD ASSFSSftZELN'I' The wetland was delineated with 13 wetiand boundary flags. Thc�vetland consists of �, a small depression that is 5,264 sqnare feet in size. It is overhung by forest � ve etation with scrub-shrub and emer ent ve etation rooted within the w g g g etland baundaries. Yovng trees approximately 10 to 15 years in age are rooted in the wetiand and have begun to develop a forested vegetation cIass. Test�-Iole#2 was established within the wedand to verify the presence of the wetland paranneters. Test Hole�l3 was located cutside of the wetland just to the south. This area was dominated by westem crabapple (Pyrus fusca)FACW, a common wetland plant. Tttis area was not ineluded in the delincation bccanse it did not huve positive indicators far hydric soil or we�land hydrology. See Appendix A-2 fur location of wetland boundary flags and test holes, and Appendix G for data forms 2 and 3. Ye e� tation Thc wctland is dominated by red osiez doswood (Cornus stolonifern)FACW. Other species present in the wetland include salmonberry (Rubus spectabilis)FAC, and slaugh sedge (Carex obnupta) OBL, HookEr willow (Sa1ix hookerana)FACW, � Dewey's sedge(Car�x deweyana)FACU, and trailing blackberry (Rubus ursinus) � FACU. Oregon ash (Fraxinus latifolia)FACW was present in the wedand as young ; ; trees and apgeared to be developing into a forest canopy over the wetland. While not i ; yet consfituting 349b of the wefland cover, these trees should dominate tbe wetland � within the ne�ct 10 yexrs. See Appertdi7c D for Definition of Indicator Sfatus (OBL, � - iFACW, FAC, etc.). ( , ; oil , � � I� Test Hole�/2 revealed a hydric soil comprised of a silt Ioam. The uppermost six 'i i � inches eomprised the `A' ho_*izon with a matriu c,�u-oma of 10 YR 3I1 without i �� 4 I ' mottles. This was underlain by a `B' horizon with a matrix chroma of 10 YR 5/1 I without mottles. lo I' Water was not preser►t at the surface or as soil saturation within the roat zone at the time of the site visit_ However, areas of scouring and water stained Ieaves were present as secondary ind.icators of iauc�dation. This was determined to be adequate evidence to assume that water is present in the wetiand well into the growing season. An inlet or an oattet to the wefland was not observed and it is $ssumed that the � wetiand is hydrologically isolatcd. It is likely that the wetland receives hydrology primarily as run-off from suirounding uplands. Seeps were not observed flowing into the wefland. � Cowardin Wetland CIassificatiare The wetlund is cIassified as Palustrine, Forested,Seasonally Flooded (PFOC). Wetland Cfass The wetland class was�determined using Chapter 21A.06.1415 of the I{ing County jl Code. The wetland is recommended for a Class 2 designation bec�use it is a forested wetland less than 1 acse but larger than 2,500 square feet in size. �unc�onal Values Because the wetland occurs in a small basin withvut an outtet, it is likely that standing water is present well into the spring. Therefore, the wetland would be a source of � drinldng water for birds and small mammals dvring the winter and spring as well as - providing breeding habitat for Pacific chorus frogs (Pseudacris regilla) and long toed I salamanders (Ambystoma macrodactylum). T1u wctiand also captures runot�from '' 5 surrounding uplands and serves as an area of storm water retention. Finaliy, because water does not ouflet from the wetland but instead remains in th�wetland during the rainy season,it is lilaely that the wetland provides some groundwater recharge. Rec:ommended Baffers � — Class 2 wetlands require 50 foot vegetated buffers measured horiz.ontally from the delineated wetland boundary plus a 15 foot building setback according the King County Sensitive Areas Code. Buffers are to remain undisturbed. Buffer width averaging may be allowed by the County if it will provide additional protection to the wetland or enhance its fiwction, as long as the total area contained in the buffer on the development proposal site does not decarease. - ' OFF-STI�VYETLANDS A Type 2 wetland is locatcd just off-site to the east of the parcel. The wetland is • associaf.ed with a seasoaal stream that flows into the off-site area through a culvert under Petrovitsky Road. The wetlaud is dominated by rcai canary grass (Phalaris arur►dinaceae)FACW. The wetland boundary is located 30 to SQ feet east of the parcel and appears to run nearly parallel to the parcel for approxirnately 200 feet before it veers sharply to the east. Buffers from the off-site wetiand appear to intrude � a short distanoe into the east portion of the parcel. Test Hole/11 was examined near the east parcel boundary in a small clearing near the . off-site weQand. The area was dominated by common hydrophytic vegetation including western crabapple (Pynts fusca)FACW, black twinberry{I,onicera - involucrata)FACW, and creeging buttercup (Ranunculus repens)FACW. The area was dctcrmincd not to bc wctland because the test pit revealed soil with s non-hydric 6 two layer profile and indicators of wetland hydrology were not present. See Data Sheet�fl. POTENTIAL IlVIPACTS OF DEVELOPMENF The pazoel is proposed to be divided into 27 lots, The wefland buffer is proposed to be maintained at a minimum of 50 feet and will be substantially greater-on the east � and west sides of the wetland. A road is proposed to be built just south of the wetland buffer. Because the wetland buffer is moderately deuse, biological support provided by the wetland sbould not be diminished by develop�nent. Eaisting wetland hydrology w�1 be wlnerable to.impacts resulting from increased impermeable surfaoe frorn developmeat of the parcel. Impacts to wetland hydrology can bc mir�imized ; . I through use through use of storm-water retentionldetention facilifies. Short term impacts to the wettand such as sedimentation can be controlled through use pf . standard best management practices such as placement of silt fences or hay bales ' � around the perimeter of the wetland. Buffer from the off-site wetland located just to the east of the parcel encroaches onto Lots 18, 19, 20, snd 21. In general these lois slope moderately down to tt►e off-site , wetIand and the wetland will be wlnerable to impacts from run-off. Silt fences or I''� ' hay bales placed along the east parcel boundary should adequately protect the wetland during short term construction activity impacts. In addition, a nazrow sGreen of � native vegetation should provide adequate protection for the wetland from long term . noise and light intrusion impacts. 7 , � � _ SLJI1�IlViARY One wetland was delineated on tE�is approumately four acre parceL The wetland meets criteria for s Class II system that is dominate� by a scrub-shrub vegetation class with a developing forested vegetarion class. The wedand is located in a depression near the middle of the north half of the parcel. Ring County protects Class II wetlands with a SO�foot vegetated buffer plus a 15 foot building setback. The standard wetland buffer should adequately minimize impacts to wetland biological support. Impacts to wetiand hydrology should be minimized through use of storm water retentionldetention facilities. Short term impacts to the wetland including sedimentation during construction of the project shauld be rninimized by the implementation of Best Management Pracbices. Off-site wetlands?ocated just east of the parcel shonId be adequately protected by a screen of native vegetation and best . management.practices. . . ; . � �IMTrATIONS This report has been prepared for Dale Vanderschcldcn. It is important to acknowledge that definition of plant commvnity boundaries is not an eaact science. Different agencies and individuals may often disagree on exact boundaries aadlor plant community classifications. It is the responsibility of the various resource ' agencies who regutate development activities in wetlands to make the final determination of wefland boundaries. Therefore, the information presented in this _ report should be reviewed by the appropriate regulatory agencies prior fo deta�ed site planning and/or construction activifies. 8 � S Given th,e oonsfraints.of.schedules and scope of work, Wiltermood Associates warrauts thac the work performed is in accardance with the t�:chnical gvidelines and criteria in effect st the time ttus report was prepared. The results and recomraendations of this report represent professional opinion based upon the information provided by the client, the client's consultants, and that gathered through the course of this wetland study. N�other warc�nty, ezpressed or implied, is made: .�1�'I1P� i �� Emmett Pritchard �TiTetIand Ecologist 9 t,�.,,�, � ... , , t � RE��RENCES Cowardin, L.,F. Golet, V. Carter_ and E. LaRoe. (`lassification of Weflands and DcePwater Habitat of the United States. U.S_ Fish and Wildlife Service,F�SlOBS 79/31. 1979. I03 pp. Environmental Laboratory. Corps of Engineers Weflands Delineation Mannal. January � 1987. 100 pp.plus appendices ' Gnard,B. Jennifer. Wetland Plants of Oregon and Washin ton. Lone Pine Pnblishing. 1995. 239 pp. Hitchcock, Leo C.and Cronqnist,Arthur. Flora of the Pacific Northwest University of Washington Press. 1973. 730 pp. King County Code: Chapter 21A.24. Environmentally Sensitive Areas. 1998. King Conniy Scnsitivc Arcns Mup Folio, 1990. King County Weflands Inveniory, 1990_ Lyons, C.P and Merilees,BilL Trees. Shrubs, and Flowers To Know in Washington and ritish Columbi� Lone Pine Publishing. 1995. 375 pp. Asunsell Color. Munsell Soil Color Charts. Macbeth, a Division of Kollmorgen Corporation. 1994 Revised Eciilio�Baltimorc,MD. Pajar,7im and MacKinnon,Andy. Plants of the Pacific Northwest Coast;Washin t�on. Oregon.British Columbia, &Alaska. Lone Pine Publish�. 1994. 527 pp. Speare-Cooke, Sarah. A Fie1d Guide to the Common Wetland Plants of Westein � Washin�ton and Northwestern Oregon. Seattle Audubon Society. 1997. 417 pp. US Army Corps of Engineers. Wetland Plants of the Pacific Northwest September, 1984. 85 pp. US Department of Agriculture, Soil Conservation Service. Soil Survev of the Kin�CountY Area, Washin t�on. November, 1973. � US�nvironmcntal Protcction Agcncy. Wctlands Evaluation Techniqu�T�: Volume I: - Literahzre Review and Evaluation Rationale. October 1991 i REFERENCES,continaed US Fish and Wildlife Service_ National List nf Pianty��ecies That Occur In Wrtlands: 1988 National Summarv. September, 1988. 244 pp. U.S.Fish and Wildlife Service. National List of Plant Specics that Occur in Wctlands, Northwest Supplemen#(Region 9). 1993. US Fish and Wildlife Service National Weflands hiventorv. 1978. Washington State Department of Ecology. A Guide to ConductinR Wetlands Inventories_ Publication Number 89-60. December 1989. Washington State Depariment of Ecology. Washington State Wetlaad Idcntification snd Delineation Manual.Pablication No.96-94. March 1997. 88 pp.plus appendices. Washington State Department of Ecology. Wefland Ratin�Svstem for Westera Washin t�on. 5ccond Edifio� PublicationNumber 93-74. August 1993_ Washi.ngton State Department of Nataral Resonrces. State of Washin�ton Natnral Herita�e ' Plan. 1993/1995 Update. 2 SITE �� II , , • _t. ,�. � ' •: , '•. � • ' •. :,..�.. � i�•� ;b..�•.��j� �»�<<a:n�'Y:Y,.r;.�•� ;` �`� i��-�:1 r'�.�l.iN^•;1��,.,'� �s . 6E 104TS iT! . �� '. �. ,' '� � - � • _' SFTE i � � . < � � p ., -• "' tierg �va ss .. S8 176TH Si � 1�tQD$BI� � � m �a � � � � _ � � Wiltermood APPENDIX A- 1 � Associates, Inc. VI C INITY IUTAP � �gso,� �" � Port Orchard. Xl Q836Q , . . 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'��_: ��, . _��..� ,. , . _:T�,.._ `r :. „�,:•:Yyrz« �;. ;�,.. - _��gs"�-:;� ,.. `� K� �. .1 M •��.�/�•5 � J.: � �+ j.�!r.►.:»;• y ��•��u�,��- ��. a�_ �I�� •� � �',j"a'��"��,� +�. �.s�-: - _ � .�� *��°�,� � " '�+�^�� ;?�. . -. �. -�: .:�'�;�, ..H� \�� .. � �:�• �, � � � ' � � ••� :,�� 'j� +�, � � 7 �r � � �i��', �,�. �� ' ` �� . , - , �'��, -� -:�i� � ., �. �:. ;:- , " �, � �j; . . -�- .. p, ��- M � jy� 1 x � � � ' � �� ' �� • r�� . �iF�'�"'"��:i�',. �� ',;�ti�,,.• 1, ''�'��. ,�: �, '�1�;,�,�+ � ,'_ �yT,�+V+ • • � VI �, ,� a �4`��', _ �� 1 �V��. ��!1_`e6� � • ' � � �T. _�� , �L� � r . .....•. � ��:: _ , �• . _ �t ��;,^,x; •, 11 1 1 1 \1 i. � • �v�1i` '�: :;rtid �.""��: ( � ' � � ✓;f,%==;`. � ��```yyy�1��'� 'y. �•�a'1� =i�:.l:,r tl�t .� ,A:`- •'�:� ;�r'.; ��.'` 1 � } �• �� 1 �� *3�' �:'i � '�'� ' �:. � :�Vj� ' ii y\':' /� �I { • I �.�`,� �� • '� APPENDIR B KING COUNT'Y SOIL SURVEY DESCItIPTION OF SOIL TYPES The soils described in this appendix are ezceipts, considered applicable to urban developmeu� #aken from the Soil Conservation Service,Soil Survey of the King County Area,Washington; November, 1973. For fmtb.er info�ation, see pages 8-10 of the Soil Sunvey. AgC Alderwood velly sandy loam, 6 to 15%slopes. This moderately well drained soil is -on nplands. It formed under conifers in glacial deposits. This soil is nflt classified as hydric; however,thc poorly drained Noima,Bellingham, Shalcar. Sesttle and�cwila soils are often included in some areas up to 3%. Pemieability of this Alderwood soil is moderately rapid in � the surface and subsoil and very slow in the substratnm. Water moves on top of the substratum � in winter.Available water capacity is low. Run-off is slow to mcdinm, and the hazsrd of erosion is moderate. APPENDIX C: DEFINTTIONS AND CRITERION • The de�Snition for wetland established by the U.S.Atmy Corps af Engineers(COE)was used to detennine the preseace and extent of wetlands on this parcel. Section 444 of the Clean Waicr Act(1972) states that wetie.nds are: "Those areas that are inundated or saturated by surface or groundwater at a frequeacy and duration sufficient to suQport,a prevalence of vegetation ' typically adapted for life in saturated soil conditions. Wetlands generally inciude swamps,marshes,bogs, and similar areas." This criteria is based on the Department of F�ology Washington State VVetland Identificarion and and Detineation Manual,the 1987 Corps of Engineers(CO�Wetland Delineation Manual and tbe 1989 Federal Interagency Comrnittee for Wetland Delineation{FICWD). This committee included , representatives from the COE,U_S.Fish and Wildlife Service,Environmental Protection Agency,and Soil Conseivation Service,to establish technical procedures and guidelines for wetland determination and delineation. Tfiese guidelines as set forth in both delineation manuals rcquires that three technical criterion: (1)hydrophytic vegetatioq (2)hydric so�s, and(3)wetiand hydrology must aIl be met for an area to be identified as wedand. A general summary of ihese criterion or parame#ers as defined within the COE and FICWD manuals include: Hydro�h,vtic Vegetation Criterion: T6is cdiLeriotl iS met wheq under norn�al circumstances SOperce�or more of the composition of the dominani apeaes from elI strata nra obligate wetland(OBL),facultative wetland(FACR�, and/or facuitative(FAG�. ' �iydric Soil Criterion: This criterion is met for acry area having soils that are saturated,flooded,or ponded long enough during the grow�ng season to develop anaerobic conditions in the upper part{LTSDA Soil Conservation Service, 1987). Wetland Fiydrology Criterion: This criterion is me�for _ any area having peamanent or periodic inundatioq ar so�saturation to the surface,at least SessOnslly. These three criterion are the basis for alI field work and wetland delineation perFotmed on this pucel. The specific mcthodology used is outlined in the ne�d sedion WETLAND DEI.INEATION METHODOLOGY � The wetland delineation followed ihe Routine On-site and Intermediate Deiermination Methods as auttined in�each manuai. A summary of this method inctudes: Plant Community Assessmen� The entire pro}ect site was initially walked to identify the plant _ community types present. This provided a rough picture of the type and extent of wetland(s) which exist on site. Also observed and noted were topographical fcatures,hydrologic flow patterns,and any significantly disturbed areas. It was then deternuned whether normal envuonrnencal cond�t�ons were present, or human modifications had occurred to the wetland. 1 Sc[cction of Samplc Area(s). A series of sample areas or points were selected and fIagged to best characterize the plant commvnities of suspected wetland and non-wefland areas. The ' appro�dmate location of these flagged sampte points were noted on a map of the proje�c site for � - subsequecrt survey. Charactecnation of Plant Communities. At each sample point the dominant plant species within the tree, shrub, and herb stratum were identified and noted on a data form. Species were identified and noted according to Flora of the Pacific Northwest(Hitchcock&Cronquist, I973). , The estimated percent areal cover and the indicator status(as listed in the National List of Ptant Species that Occur in Wetlands: 1988, Washington)were also noted on the data farm. It was thcn dctermincd whether the hydrophytic vegetation criteria was met_ Whea 50%or more of the dominant species have an indicator status of OBL,FACW,or FAC,the vegetation is considered hydrophytic_ � Characteriaation of Soils. At each sample point, a hole 16 to 18 inches ia depth was dug using a spade(an e�cisting soil per�c hole was used if available). Soil characteristics(matrix coior,mottles, etc.}were examined and noted. It was thea determined whether the hydric soil cri[erion was met. Hydric soil ciiterion is outiined on page 6 of the FICVVD manual and pages 26 to 34 of the COE manual. Detcrmination otIIydro[ogy Criterion. At each sample point the presence ofinundation by water, soil saturati�n by water, or other hydrologic field indicators was noted. IL was then determ;ned whether the wetland hydrolog}r criterion was met. Wctland Dctcrmiaation. The completed data forms were then examined for each seleded sample point within the plant communities. Each plant community meeting the hydrophytic vegctatioq E►ydric soil, and wetland hydrolog}+criteria was considered wetland. Data forms are i . numbered cocrespondingly to the sample points located on the final survey drawing. DETERA'[INATfON Or WETLAND-NONWETLAND BOUNDARY After completing[hc dctermination method snmmarized above,the actual boundary between wetland and non-wetland was delineatcd. This delineation was completed by: l.recognizing obvious wetland and nan-wetland areas, 2. identification oftransitional areas between the two areas, ' 3. final determination of tF�e boundary by further sampling of vegetation, soiis, and hydrology. The wetland IIoundary was then lla�ged with numbered orange flags with WB (Wetland Boundary) wri(ten on thcm. The approximatc location of thesc flags was then noted on a map,if available, for subsequent survey. � - • * Important Note: The exact location of the boundary between wetland and non-wetland areas may be difficult to determine, especialty iftransition areas are more gradual. In cases such as this the wetland boundary is deternuncd, aRer further sampling,by using the best possible professional judgment. 2 , _ . . . ._ . •. t APPENQlX D: DEFfNITION OF PIANT 1ND{CATOR STATUS - The fotlowing ptant indicator status categories and their symbols are derived from the Wetland Plant list, Northwest Region, USFWS,Washington, D.C. (Reed, 7 988) Symbol Definition of Plant Indicator Status i � OBL Obtigate wetland plants are nearty always found in � wetfands(estimated ptobabitity 9996 or more) � FACW Facultative wettand plants usually found in wetlands . {estimated probability 67-9996) � FAC Facultative plants are equally likely in wetlands and uplands(estimated probability 34-b6%) FACU Facultative upland piants uwatly in uplands(estimated probabi{ity 67-9996) UPL Uptand ptants are nearly always in uplands iestimated probability 99% or more) Nf Not indicated plant species are not determined due to lack of wfficient information NL Not (isted in the"National List of Ptant Species that Occur in Wetlands" indcating the fack of lntormation ' for this species. Piote: The "National List of P1ant species that Occur in Wetlands"�uses a plus (+) � or minus (}sign to specify a higher a Iower portion of a particular wettand indicatoc frequency for the ihree facultative-type indicators...). (fronl sedion 2.5, page 6, Federal Manual for ldentifying and Delineating)urisdictional Wetlands) ' • APPENDIX F Wetland Yalues and �unctions It is important that those involved in wetland regulation and management understand thei.r _ functians and values. Knowledge of these mles can be a key factor in the design and implementation of Yvetland inventories. Not alI wetfands provide each func6on or valve nor do lhey provide them to the same degree. Variations oaur because of wetland type and characteristics; as well as regional and Ioca�influences. Some loq.l governments try to distinguish how functions and values relate to their community and region. The following is a brief _ �- - Water Supply With the growth of urban centers au�d dwindling water supplies, wetlands are increasingly important as a source of surface and ground water. They can function as recharge areas where j � water soaks into tl�e soils, repleaistiing gmund water suppiies. Wetlands are also•azeas where ground water moves to the surface through springs and seepage, often collacting in pools and - ponds, and supplying critical reseives during periods of drought. Flood Contrnl Wetlands are valuable in reducing the impact of floodiag. They have the ability to store and slow the flow of water from upiand run-off. If a wetland is associated�with a river in a flat valley, ttie - wetland and its vegetation reduces the height and velocity of flood pealcs. Some wetland soils can � store large amounts of floodwater and gradually release them downstream. Construction in flood � plain wetlands causes increase flood heights and rates, and an associated increase in flood damage. Frosion Control Vegetated wetlands serve as natural buffers fmm the effects of tides, waves, wind and river � currents. They dissipate the energy of these erosive forces. The fihrous root systems of wetland - plants bind and stabilizc banks, protecting the shoreIine from erosion. On the coa.st, they can limit wave generation, slow and absorb the impacLs of wave energy, and ihereby protect inland areas , from storm damage. Construction of bulkheads, rip-rap, and other banked hardening stabilization techniques simply transfer the erosive energy to neighboring areas. Pollufion and Sediment Control Wetlands protect and improve the quality of surface and ground waters by removing sediments, nutrients, heavy metals, and hazardous chemicals. Wetlands vegetation filters particulate matter from the water. When moving water comes into contact with vegetation, its flow is slowed and - sediment falis out of saspension. The root systems trap the sediment, reducing siltation in _-_-c: ,r �-t - � _ downstreani water bodies. Substances such as nutrients, pathogens, and many chemicals are often - boand to the surface of sediment puticies. T1ius, sedimentation reIIuces boih organic and inorganic pollutants. These pollutants may be released when wetland soiis ar�e disturbed. Wetland __ I vascular plant�and algae also absorb n�tricnts and chcmicals. The micro--organisms utilize � dissolved nutrients and break down organic matter. Research is underv�ray to determine the � impacts of utilizing wetlands u tertiary waste treatrnent facili6es. - -- � Wildlife Habitat . Wetiands, the interface beiween Iand and water, are among the richest wildIife habitats in the : world. They provide the conditions essential for the breeding, nesting, feeding,and protection for � many species of waterfowl, mammals, �ptilcs, and amp�u'bians. These conditions include � abundant water, diverse and rich vcgetation, and adeq�ate oovei. Many of these species are 'obligates" or dependeat upoa thc wetland for their survival_ Some such as the beaver spetld their - entine lifetimes in ttsee wetland environmea� Others like the salmon inhabit it for shorter, but : critical, parts of their life cycle. Numerous species (such as deer and raccooa)depend on - wetlasids as a source of drinking water, food, and winter cover. WetIands are as criticat to the . needs of these species as they are to thase that depend solely on wetland habitat. Though mauy waterfowl nest primarily in northern freshwater wetlands, they use wetIands through out the county while migrating and for over-wintexing. Birds such as herons, egrets, rails and harriers ; depend upon wetlands for their survival. Both saIt and fres�water wetlands ue importani spawning, nursery, feeding, and wintering azeas for sport and commercial fish and shellfish. Wcilands also support maay cndangcx�ed plant and anunal apacies. Although wetlands consiitute -: only 5 per cent of the nation's lands, close the 35 per cent of all rare and endangered animal - species are dependent upon them. {McMillan, A. 198� - Fooa w� �oau�t��tty � Wetlands play an important part in the food web. Coastal wetlands ue among ihe masi productive areas in the world. Solaz energy is uti[ized by wetland plants to produce hundreds of pounds of nutricnts per acrc of salt marsh annua2ly. The vegetation dies� decays,and is broken - � - dowa to form a nutrier►t-rich"soup' cailed detritus. T'his rich food source is converted by micro- _ - organisms into basic nutrients and elements for use by vascular plants and phytoplankton (minute - - � floating plant life). T�►e phytoplankton ue consumed by zooplankton (minute noating anirnal -� Iife). the detritus and plankton's are carried into tidal creeks,and bays and are consumed by __ � invertebrates such as oysiers, shrimp and crabs. they in turn aze preyed upon by other animals - - _: � ir►cluding humans. It has been esGmated that 90 per cent of tfie important oommercial marine species eitl�er spend their entire lives in estuarine wetlands or raquire estuaries as nursery grounds (Kusler, J. 1983). Freshwater weilands also provide food, habitat, and spawning grouads for �' many other species of fish. � - . L ". S _:y A- � ' Education and Restarch Coastal and inland wetlands provide unique opportunities for education and scientific research. Due to the land-water i�tecfac�diversity of vegetatioq topagraphy, and the resu�ting varied habitats, - wetlands are ideal for studying plant and animal life. Because ecological relalionships are easily observed,they are excelle,nt locations for teaching environmental science. The compiex ecological - relationships of wetland systcrr�s make them valuable areas for scienti&c rescarch as wo1L Recreation and Aesthetic Values �" Wetlands are areas not only of greai diversify but also of great beauty. They provide open space and contrast for bcsth visual and recreational enjoyment,especially valuable in urbaa areas. Vsitors - include ptwtographers,bud watchers,h�cers,boaters,hunters,fishers and natural history enthusiasts. A.ppreciation and use of wetlands as a recreational resource is sieadily increasing on both a national __ and state-wide basis. Nauonal,wetla�ad-dependeat waterfowl arc hunted by over 2 m�7lioa huaters. N�squally I�Iational w�dlife Refnge,near Olympia,Washingtou has had a 300 penx�increase on visitor usc sincc 1977.(McMiilan,A 198� Refesei►cts Washington StaLe Departmcnt of�calogy,A Gvide to Conducting Wetlands Inventories, 1989 � u�i�r v�c�+i �'-� MODIFIED - ) • ROUTINE ON SITE DETERA�NATIOrI METHOD E � Field Investiga or. Date: a Q ProjecdSite: LkV�� County. � �e: W A�plicandOwner. Surve or: � -� Describe current co ditions o wedand and surroundi g areas: � Has the vegetation,soits, and/or hydrology been significanily disturbed? Yes No_�_ If yes,what are modifiers: ` � SOIIS Mapped Series: /�1 � '�5�.S� - Hydnc soils Gst?: Yes No Hydric Incl sion? Depth Horizon Color Texture Hvdric Soi Indicators es o De th � Matrix Motde H�istosol . _ - /-� /O 3 I�istic Epipedon - O a Gleyed SSulfidic odor , Concretions - Is the hydric soil criterion mei? . Yes No,�_ - : Rationafe: �p:( C',{•,rc�►-y,r _ �S -M� l• ��h (t qd�-�_ rr��1. 9 %:� � HYDROLOGY General wetland type or characteristic: Emergent Scrub/Shrub Forested Permanentty flooded Seasonalty flooded Temporarily flooded Saturated Types of water hodies associated with the wetland: River Stream SeepJSprin�_ - , Pond/I.ake TidaI Drainage ditch/channel Other: ' Is the ground surface inundated? Yes No'n Surface watec depth: n(or-c Is the soit saturaled? .Yes No�Depth to water in test hole:_ _ 1s u�-c - Field evidenee of surface inundaiion or soil saturation: v�[� Is the wetland hydrology criterion met? Yes No�,_ . Rationale: j�n ,P.ut d�tm[.� Dr�fS-Cir,� , �1�.d,r�.a� t,.�a�,.o��.y tl J �� SUMMARY Hydric soil present? Yes No�_Hydrology present? Yes No_� Hydrophytic vegetation present? Yes�_Ido ' Percent of FAC,FACW, and OBL species: /� js thc sitc a wcttandT Ycs No�_ � Ralionale: - TEST HOLE# -�- OF 3 � APPENDIK G �►_ - ilOCAT[ON O�'TEST IIOLE � tiYiitercnood Associates, Inc. ` � � 1015 SW Iiarper Road SLE REVERS� FOR uEGETATtON � �'ort Orcl�ard,WA 98367 (3G0) 87G-Zd03 COh[MON WETI..ANA AND NON-WE'['i.AAtD VEGETATI0IV " �`. s-�. ' � " Dominant Trcc Spccict _ -.. %tovcr %wvcr _Paatc wiilow Saliz faaiandm FAC W _Sitkn spcuce Picea sitchuuis FAC _Oregon as6 Frnxinrs latijolia C:4CW _Wcstcm rcd ccdar 7hrrfo pGoola FAC , _Quaking aspca Pvpelus tremala TAC+ � _Cascara Rhamn,rr purshiana FAC- Red alder .�lnus nrbm FAC _Bigleatmaplc Accr�racrophy!lrmt FACU — � �Blaek eottonwood PoDtelus GaLranrijero FAC _Western hemlock Tsugo 6e�enop{q�lo FACU _Scot�ter's willow Saliz scorderiann FAC _Douglas fu Pseudotrngn marziesii FACU _Other tr�x speaes Praeat Dominaul Shrub Spcdq " _Hardhack Sptrm douglasit FACW _ScoYs broan Cytisus scoparius FACU -- Red Oszei Dopwood Contits slolduftra FACW Fve�grecn hTrcklchcrty Yneciniv,n o..atvm FACU �Bladc twinbusy Lonicun imalucmta FAC+ /S,Z,Ii'imalnyan blackberry Rubrv disrnlor FACU " _Devil's club Oplopaiar Lorridus FAC+ _Salal Cwr�lJreria.rha!!o» FACU __ ' Salmonberry R�b�u spectobtfis FAC Indian pium Oemlaria cuwsijorrnra FACU " Nootka rose 12asa natlknw FAC �Hazclnut Corylru cornum FACU 1Q Yu�e mapk .�errcirrirfotum FAG _Red huckleberry Yac�ciruum parvijolium UPL _Fuglish ivy Hedem heliz �FAGU _Oregoa grapc Be►{xrJs Aervasa UPL -- � �Rcd ddabacy Samburns racano.ra FACU _Oocan spray NotodlsCat dlacolor UPL � _Scawbaty S��aplrorncnrpus albuJ FACU � '� _ a shrub spccics t Domioant Focb Spaics _Skunk cabbage LyxldUtwn americvnura ODL �Sanging aetlte Urtica diocJa FAC+ _Calta� Typlw lotlolia ODL _Spsing beanly Claytatia rlbiritia FAC �Watcr parslry Oeewnf/x sarmartasa ODL _Yelvct grass Nolcur laeahu FAC _ _Slough srdge Ccrrx obmpta ODL _I.�dy C«n A�l+vrixm�lir�e+iurra FAC _Small fruitod bulrusi� Scirp�s micrornrpus 013L _Hocaetail l:qnisen+n�arveitse FAC _Talt[nanna grass Glyeeria elota FACW _Youlh-0n-age Tofmcia nrerrziuii FAC Sa��bcak scdgc Carex stipata FACW _Cal's car lfjqocliaeris rafica�a FACU Rushcs J�oicus spp. rACW Trailine blackberry Rubus rr.rinus FACU S Soft tusi� hrttart�'utus PACW �Bracken Ccm P►eridiunr aquili�rum FACU $b Crccping buttcrsup Rmrrmcvlut re�rs FACW _Sword fcrn Polysticl�um munitum FACU — � �Q Rced Canazy grass Plfalaris arxhdiracea FACW _Bleedi�heart Dicrnrm jomwaa FACU :j • ;3 Otha Corb spccics prescnt � ��^� P �_ �(1.vr,CW�. t'ft�.� - � % �o r :d.�,�.- a 57 :._ Pcrcent ofdominant s�ccics FAC,FACW,OBL:� IIPLAND? WF,Ti.ATiD? - Is ii►c hydroph}hic vcgctation crilcrion mct? Ycs�No_ WETLAPiD TYPE: Palustrine Riverine �,:� Rationalc: A t� �„�-�— �rcd�}u:�-,rr, Lacustrinc Estuarine i 5 ��q-�!1(w�(-�r . Forestcd SccuWSlirub -� x ��- E�ncrgcnt Opcn Watcr _� Wct Mcado�rlPasturc __ � -a ��rux��•i .�`' MODIFIED � � � ROUTINE ON SITE DETERMINATION METHOD '- Field Investigator. �� S4�C�.�-- Date: Project/Site: County: State: ApplicandOwner: . Surveyor: -- Describe ent nditions of wetland and surrounding areas: !o - � � _r . �_ Has the vegetatio�soiis, and/or hydro(ogy been si nificandy disturt�e ? Yes_�No If yes, at ue modifiers: 0,,�1� ` s - SOII,S . Mapped Series: - o S�5 •- Hydric soi(s list?: Y osl _ Hydric clusion? � Depth Horizon Color Texture Hydric Soil Indicators Yes No De th . Matrix Mottle Histosol :.. -Co � � �/t•- A(t� �j i k- (�...�;I�istic Epipedon - - -f (,�r,,r., Gle ed (,Q- S�� b �%! Sulfidic odor : Concretions ` Is the hydric s ' cri erion et? Yes_�No Rationaie: � HYDROLOGY General wetland type or characieristic: Emergent Scrub/Shrub Forested� Permanently flooded Seasonally flooded�_Temporarily flooded____Saturated Types of water bodies associated with the wetland: River Stream S�eeplSprin�_ -- Pond/I,ake Tidai Drainage ditch/channel Other: Is the ground surface inundated? Yes_No�Surface water depth: �,n,.s Is U►e soit saturated? Yes No X Depth to water in test hole: - - Fiel evidence of surface inundation or soil saturation: Is the wetland hydrology criterion met? Ycs No � _u� Rationale: � G� � - SUMMARY Hydric soil present? Yes�No Hydrology present? Yes x No Hydrophytic vegetation preseni? Yes x No Percent of FAC, FACW,and OBL species:�_ Is ihc sitc av�cilaiid? Yes l� No Rationale: ,E-1�11 u� A�,ra�►-.-e-��ir-S ��,i r.�F:t c�.�Ra,�--t� TEST HOLE# � OF 3 �� APPENDIX G /:_ = - . LOCATION OF TEST 1101,E � Wittermood Associatcs,Inc. y�� //�,_ Z � -1015 SW Harper Road � Port Orchard,WA 98367 SEE REVERSE FOR VEGETATiON (3G0)876-2403 COMMON WETLAND AND NON-WETLAND VEGETATTON -. �=� Doroinant Trcc S�Ccics __ � %covcr %covcr Pacific willow Sa1ix laaiandro FACW Sit3a spruce Picoo sttdreruis FAC --� � �a-�� F„�,,,�r�af�ta FACW _Watan red cedar rr�ulQ�r�� rnc _Quaking�1p«i Poyxla.t tremylc FAC+ _Cascara Rhammes pxrshiara FAG _Red alder �tlmrs rubra FAC _Bigleaf maple Acrr macrophyllu�n FACU -- _Blacic cottonwval Pop�Gcr baLmm;jcra FAC _Wc�tcm hcmlock T.wSa 6etarophylla FACU _Scouler's tvalow Sofixscroateriana FAC _Dauglas fir Pseudotsuga mrnziesii FACU _Other trcc specics prcunl• ^ . Domiatnt Shru6 Specics . Hardhack Spirmdouglosii. FACW _Scot'sbroom Cylirusaroparius FACU __ . �Rca osia nogwooa conrua srorw,lfe.n racw _Bvcrgccn hu�Jcicb«Ty vaoc�„rw,.c.ti.a,.r Fncu � _Dtatk twinbctry Loalecro iriwvluaola FAC+ _H'imalayan btackbeiry Rwbks discolor FACU _DeviPs ciub Oplopanax horridus FAC+ _Sa1al Govlrhaia alur!!on FACU —`�.�Salmonbcrry Rr.b.cs speda6ilis FAC _Indian pliun Ocrnlaria eernrfjonr+is FACU ' _Nootka rose Rom uWl�a�ur FAC _HartInut Coryrus cornuta FACU Y�ne maptc �nr circirurtwn FAG _Red kucklcbccry Yaedeirm pvrvijoli�nr UPL _____Ettglish ivy Nedua heliz . FACU _Ottgon grape Berb�ris nervara UPL - _Red ddnbary Sarnb�cus�ncemosa FACU _Ocean spray Xolodi.rc�rs diroolw UPL _Snowbary Sympl�orocarpus albus FACU } _Olher stuvb spexics pc�esent nomioaat Forlr 5ptcics `Sl-ua1:eabbage Lytichltunr americamm� OBL _Stiaging nettle Urticn dioria FAC+ _CaUmil Typ)�a Jafijolia OBL _Spcing beanty Claytaria sibirica FAC Water parstey Ouandu rarmrartasa OBL _Velvet gracs Hofcus lvrwtus PAC _ TYttcJ2 Slough scdgc C;aner obnupra OBL _I.edy Ccrn ilrhyr-lo,n filu frmi.�a FAC _Small fruited buln�sh Sci�pus ndcrrxarpus ODL `Hoaselail l'quiselum a►verrsc FAC _Tall manna grass Glrceria ilofa FACW _Youthon�ge Tolmeio maaiesii FAC _Sawbcak scdbc Caier adpata FACW Gt't ear Nypo�l.atri e�nAicata FACU - Rttslus Juncw app_ FACW 2�Trailing blxkbccry Rubus ursinus FACU . So(t rush Jxnau ef)'rrsua FACW _B[acl:en fem Pr�ridiirm aqurlinum FACU � ; _Crceping bultercup Ronenctdus ncptn.r FACW _Sword fern Polys�ichum n�mritun► FACU -- - !I _Rccd Csnary grass Plwlaris arwrdirwcm FACW _Bletdino h�'ari Dicn�tm jormara FACU f � Othcr forb spccics presrnt ti �T��L[,(..e FA(�w -- Pcrccnt of domin:uu spccics FAC,FACW,OBL:� UPI.AND? WETLATID? " ' Is Wc hydropli}Kic vcgctation crilcrion mcl7 Yes.�No WETLAND TYPE: Palustrinc Rivcrinc Rationalr I..xustrinc Fstuarine Forestcct Scrub/Sh�ub - Emcrgcnt Opcn Walcr Wcl Mcado�n/Pasturc � ' � �✓n xn, rvt�f�i A'IODIFFED � ROUTINE ON SITE DETER14iINATEON h�TKOD � Field Inves[igator:�� c�,� S�.-��;� �� Date: — ProjecdSite: County: Staie: A.ppticandOwner: Surve or: Describe cu�re t conditions of wctland and sarro�nding arcas: .- SJ � . Has th vegeiation, soils, and/or hydrology been significantly disturbed7 Yes�No _ If yes,what are modifiers: fll,cSL Q. rb � ` SOILS Mapped Series: u G P �,t ra�TQ 4 t''�(�� o�-�,u �u�-r, (c—t�, S-(,m�ze,s Hydnc soils list?: Y No�_ Hydnc I 1 sion? -- Depth �lorizon Color Texture H}�dric Soil Indicators Yes No De th \4atrix Mottle Histosol ' Q�—�n �- loY�/L No (�,cz�+--., HisticEpipedon (,�— , �ile��ed (� u,/ �5uifidic odor GuG��i� Concretions Is tl�e hydric soil criterion met? 1'cs No�_ -- Rationafc: .5,� L L,.-tn..Q �'�o �,��.� IiI'DROLOGY ` General wetland tvpe or chazacteristic: Emeree�i ScrublShrub Forested -- Pennanently llooded Seasonally flooJcd Temporaril��floo�ed Saturated . Types of��ater bodies associated with the wetland: River Siream Serp/Sprin�_ Pond/I,ake Tidai DrainaDe ditcl�/channe� Gther: _ �— Is the ground s�rface inundated? Yes No x Surface�vzter depth: r�� Is the so:l saturated? Yes T�`o,�c Depth to watcr in test hole: /1-�n�, Field evidei:ce of suctace inundation or soil saturation: /1� �_ � Is [hc wetland hydrology criterion met? Yes Ivo�_ • Ratior.alc: - . SUMh7ARY Hydric soi!present? Yes No K Hydrology preseut? 1'cs No_�_ Hydro�hytic ve�etaiion pr�,sent? Yes `� No � Percent of FAC,i'AC��/, and OIIL species: �ov Is tlie site a welland� Yes No�_ R.a 'onale:�-,,,�,5� �1c,c..,P [� 1.( � a��a�Lr� nr�vt l�S� �r11P r)�i�-� . b � TEST HOLE#�_OF�_ � APP�I�DIX G f: — _ LOCATIOI� nl�TES'i' iEOL.E � _ ` �'Viitcrmoad Associ�tes, inc. .�O ,�nr{ �a�.,�-�-, c�-�' 1,�.�F�—'� �: 1015 S�V I�ar��cr Road � � Port Orcliard,l'VA 983G7 SEE REVERS[', hOti <<EGETATtON ;;�,�� s7��-2aa3 COMhTON WETLA2'iD AND NON-WETLAND VEGETATION - - �--� , Dominant Trcc Spccics _ , •/.to�•cr %covcr Pacifet willow SaJiz lasiandrn FACW Silka spruce Picra sitchcn.ris FAC �Orcgon tsh Frosinus lofifolia FACW _Weslern rcd ctdar 7hrqa plrcam FAC _ _Quaking aspea Popvtus tremuln FAC+ _Cascara Rhamnus purshiana FAG _Rcd alder .11nut nrbra FAC _Bigltaf maple Acer mncrophyllurx FACU - !l31aGc tott�onWood Populus balsantlfcru FAC _Wcstcrn 2�catloek T.waa 6e�eroplryllo FACU , _Scoulds willow Solix urnrlcritrna FAC _Douglas Cu PJCI(dOLTfIgQ 1Ap727GT11 FACU ,�}IGC tICC SpCCIGS PCCSfSIt — : Doaunant Shrub Spccia Hasdliack Spina douglasii FACW _Scot's bromn Cyrisrr,r rcopori,�.s FACU — _Red OSitf llogwoOd Cornus s(olort fe�u FACW �vcrgrcrn hucklcbury 4caciniwnr ovoiM+N FACU • i . ,Black twinbary Lanicero i�rvolucrnta FAC+ "fj/jLcfZ Himalayan blatl:berry Rubas disrnlor FACU • _DeviPs ciub Op/opm�az horridus FAC+ Salal Gould+cra sha!/on FACU ,Salmonbary R,.bws spoctabilis FAC /�Indian plum Oemlaria cerosrjorn�is FAC(J , Noolkn mse Rosa►rutJ:mra FAC _Hazelnul Corylus eornura FACU �C'�Vine 1naple Acer einirwtwn FAG _Rod hucklcbary Yaccinium parvrfo(ium UPL _F.nglish ivy Htduu heli.r . FACU. Oregam grape I�erbcris nervosa UPL - _Red dduberry Sanrbucus mcm+asa FACU _Occan sp[ay Holodiscus discotor UPL !Snowb�y Symplrororerpus albus FACU � ; Ot�x sfwb specria��presrn�=��(,�� N�� QG�.� NZ � � �� '�i <-a-, F/�(d.(J � u Dominant Forii Spccics _Sliu�k cabbage Lysid�itun�mnericanwn OBL `Slinging uettle Unrc,o dioeia FAC+ _GUa�7 Tjpka loti�olia ODL ,Spting beauty Clayta+ia si6irica FAC � Weta pazsley Oaw�ube sarmanlosa OIIL Vdvet grass Nolcut lonalus FAC ._ _Slough sedgt Ca►er o6xnpla OBL ��Ltdy fern Afhvriwm frlrn�o��i�w FAC _Small fruited bulrush Scirpws n�icr»earpus OI3L _liaxtail F.quiselum an�aue FAC . _Tall manne grass Gf��rera elala FACW _Youth-on-agc Tolnrera mnrri�s+i FAC _$aw'bcak scdoe Caru stipatu FACW- Cat's car HtryN>cl�auis mdicolo PACU Rushts luncus.rpp. FACW �l� Trailing bleckbc[ry Rubus vrsiniu FACU So(l iush Juncus eff'usus FACW Dractcn fen� Pleridiwm aqvilir�unr FACU _Creepiitg buttcrcup Rnr,w�culws repou FACW /D Sarord fcrn Pofvs�ickrm�mmrrttun FACU - _Rccd Canary grsss Plralmi c arv�:dinacea FACW B{otding hcart Dictn(ro jo�masa FACU ' _Olhcr forb spccics presait: - . ' � Pcrocnt oI dominant spcCics FA�,FACW,OBL: UPLAND' WETLAHD? " Is thc liydroph�Kic vegctation crilcrion mct? Yes�No WETLAND 7'YPE: Paluslrinc Riverinc , Rationatc: Laaistrinc Esluarine Forestcd Scrub/Shrub Emcrgcnt Opcn Walcr � 17�'cl Mcado�c/P:isturc �� - � x ; :.D 6.3 Phase 1 Environmental Site Assessment Prepared by E3RA, Inc., dated August 11, 2004 � � ( E3 RA PHASE I F,NVIRONMENTAL SITE ASSESSMENT 11925 Southeast Petrovitskv Koad Renton, Washington (Parcel Numbers 6196600380 & 6196600381) Submitted to: Bennett Sherman, LLC 12011 NE 1S' Street, Suite 309 Bellevue, Washington 98005 Submittcd bti�: E3I2A, Inc. Post Office Box 44890 `Tacoma, Washington 98444 August l6, 2004 Job No. T041 l 6A . � 1��1[31,F. Of� ('ON'1�1�.N�fS EXECUTIVE SUN1MARl' 1.0 1NTRODUCTION.........................................................................................................................................� l.l LIMITATIONS...............................................................................................................................................3 2.0 SITE HISTORY AND HISTORICAL RECORDS REVIEW...................................................................� 2.1 SITE DESCRIPTION .....................................................................................................................................� 22 AERIAL PHOTOGRAPHS ............................................................................................................................� 2.3 SANBORN FIRE INSURANCE MAPS.........................................................................................................� 2.4 ENVIRONMEN"1'ALDn"I�nBASGSSEARC}1...................�----�----......._.........................................................� 2.4.1 FEDERAL DATABASES........................................................................................................................� 2.4.2 S'I'ATF DnTABnSES.............................................................................................................................6 2.4.3 ORYFfAN SI'T'ES........................ . --•--............................7 . ............................................ 3.0 SITE RECONNAISSANCE .............................................................................................7 3.1 PHYSICAL SETTING....................................................................................................................................8 3.2 ENVIRONMENTAL SETTING ....................................................................................................................9 3.2.1 S1TE GEOLOGY,I�YDROGEOLOGY,AND SO]LS............................................................................9 32.2 ADJACENT PROPERTIES.....................................................................................................................9 - 33 UNDERGROUND STORAGE TANKS(USTS)..........................................................................................10 } 3.4 ABOVEGROUND STORAGE TANKS(ASTS)..........................................................................................10 3.5 UTILITIES....................................................................................................................................................10 3.6 CHEMICAL USE AND STORAGE.............................................................................................................10 3.7 SOLID WAS"TE............................................................................................................................................10 3.8 WAS��GWATER...........................................................................................................................................10 3.9 STORMWATER...........................................................................................................................................10 3.10 POLYCHLORINATED I3IPHENYLS(PCBS)...................•--•--...................................................................10 3.11 SPILLS/RELEASES.....................................................................................................................................10 3.12 CERCI,A LIABILITY POTENTIAL............................................................................................................10 4.0 CON('Ll1SlONS AtiD RECOR11�1F,NU.1T10NS ...... ............................................................................. 1 1 LIS1�Of� FIGURES FIGURE 1 'I'OPOGRAPI�IC AND LOCATION MAP L1ST OF APPENDICES APPENDIX A PHOTOGRAPHS Or THE S1"l l: APYENDIX R EDR ENVIRONMENTAL DA"l A}3�1SL RI?POR"l nf'YI-:NI)1X (' "I�AX �1SSESSOR'S IZI�.CORf)S � �I oa I(,.4 i ►�:3RA 1 - � T I 1:3KA. inc. ;\ucutit 1R. 2U04 �I 1 04I1GA ' ' EXECUTIVE SUMMARY f;3RA has performed this Phase 1 ESA of the real properties(as listed in Section 1.0)in Renton. 1�'�shington in I' conformance with the scope and limitations of ASTM Practice E1527-00. Anv exceptions to, or deletions ' from, this practice are described in Section 1.0 of this report. Based on the results of the Phase I F,SA, including the Site inspection, information provided by persons knowledgeable of the Site and regulatory agencies, documents reviewed and the environmental database searches, no recognized environmental conditions were identified at the Site. "I�here were multiple piles of construction debris, including roofing materials and metal piping,and yard��aste spread throughout the undeveloped parcel. There were also mulliple pieces of scrap metal, including an automobile hood and bumper,and an old freezer spread throughout the parcel. There�vas also�tihat appeared to be an old foundation in the middle ofthe parcel, including a concrete pad and concrete masonry unit(CMU) walL The debris and foundation were overgrown��ith vegetation,making it difficult to assess the total amount ofdebris. 7�he debris and foundation are not considered likely to have negativel� impacted the Site. However, E3RA recommends that the debris be removed prior to the development ofthe property�and ihat the foundation and CMU wall be examined more thoroughly for signs ofan underground storage tank once the vegetation has been removed. Several properties kno��-n or suspected to be environmentally impaired��-ere listed in State databases. Soil and/ or groundwater at these properties have reportedly become contaminated during unspecified on-site operations. "I�he impact, if any,of these sites on the subject site cannot be determined without further investigation that is beyond the scope of this Phase I ESA. However, based upon the federal, state, and local database review as �vell as visual observations,properties near the subject site are not considered to represent a reasonable risk of impairment to the subject site. 1 1 � G3RA,Inc. ;�ugu�t 18.2004 T04116A �� 1.0 INTRODUCTION E3RA, lnc. (E3RA) was retained by Bennett Sherman I.LC to conduct a Phase I Environmental Site Assessment(ESA)oftwo real property parcels in Renton. King County, V4'ashington(Property,subject site or Site). The purpose of the Phase 1 ESA �i�as to identify potential recognized environmental conditions, as defined by ASTM Standard E1527-00, associated «�ith prior or on-going activities at the Site. The parcel numbers, addresses, and improvements(as listed by King Counh' Assessor)are listed in the table below. Parcel Number Address Taxpayer Improvements Mobile Home, 6196600380 ] 1925 SE Petrovitsky Road Dale Vanderschelden Shop, and Sheds Dale + Elizabelh 619660038] None Listed None Listed Vanderschelden This Phase I ESA has been conducted in general accordance with ASTM Standard E1527-00 for conducting environmental assessments. The scope of work for the Phase I ESA included: • A review of current environmental records pertaining to the Site and adjacent properties including Federal, State, and local environmental databases and records; • A review of historical records pertaining to the Site and vicinit}�; • A visual reconnaissance of accessible portions of the Site and observation of surrounding properties �i for past and current Property usage and adjacent property occupancy; ii • An inspection of Site structures, facilities, equipment, utility se►-vices, and operations; � • Visual inspection to assist in the identification ofconditions that represented potential environmental concerns; • A revie�� of practices and records associated with aboveground and underground storage tanks, � chemical usage and storage, spill/release incidents, �vaste handling, accumulation, storage and ' disposal, wastewater discharges, and equipment that potentially contain polychlorinated biphenyls (PCBs); • An intervie�v�arith key representatives kno��ledgeable with the uses and physical characteristics ofthe Site; and • The preparation of a report documenting the findings of this Phase 1 F,nvironmental Assessment. l.l Limitations This Phase 1 was prepared in accordance��ith E3RA's proposal dated July 29,2004 and in general accordance with ASTM E 1527-00. The Phase I ESA has been prepared for the use of Bennett Sherman LLC,and ma��not be relied upon b}�anv other pariy without the written concurrence from E3R�1. I;3RA esercised due diligence 2 ` ' I�-;R:1. fnc. ��ueust 1R. 200-� I�11-11 IG.� to visually inspect representative and reasonably accessible portions of the subject site. Some areas of the site ma�� not have been visuall}� inspccted duc ro the densit��of�egctation, standing�a�ater, or other obstructions. 2A SITE HISTORY ANU H1S'I'ORICAL RF,CORDS REVIEW As part of this Phase 1 ESA, E3RA contacted individuals and government agencies to provide information concerning the current and past use ofthe Property. E3RA revie��ed tax assessment records,historical maps, historical aerial photographs, and King Count�- records. In addition, E3RA contracted Environmental Data Resources, lne. (EDR) to conduct a search of federal and state environmental databases to assist in the identification of conditions of environmental concern at the Site (see Appendix B, FDR Lnvirom�re��tal Database Report}. 2_I Site Description The rectangular-shaped,3.87-acre site consists of t��-o separate tax parcels in Renton, Washington. "I�he two parcels consist of undeveloped forested land and single family residential with a mobile home,shop,and sheds that are currently occupied b� MKM Construction Inc. "I�he Site is physically south of Southeast Petrovitsky Road and east of 1 18th Avenue Southeast_ The legal descriptions and zoning t��r the parcels is included in /lppendix C, 7u.r As.ti��.csor's Rc�cr�r�d.e. 2 '' /lerial Photo�ra�� Aerial photographs were revie��ed to docurnent the development ofthe Site and assist in the identification of Site features and outdoor activities of potential environmental concern. Where visible,the presence or absence of structures on the Site and developmental trends in the area are noted. Aerial photographs were available for the Site area from Walker&Associates for the years 1936, 1946, 1960, 1968, 1974, 1980, 1990, 1995,2000, and 2002. The photographs ranged in scale from 1-inch=800 feet to 1-inch=2,000 ft. "rhe aerial photograph review is based on observations ihat are interpretive and limited to the area immediately on and surrounding the subject Site. These observations are also limited by variations in resolution, contrast, color and in the height from ��hich the photographs were taken. 1936 (1:800, E3&W) The subject site and vicinity are visible in the 1936 aerial photograph. The Site aF��cars as undcvclopcd forest. 'T'he subject site is bordcred to the n�rth. sc�uth_ east. and ��cst bv forested land. 1946 (I:1000, B&W') The subjectsite and vicinity are visible in the 19-1G aerial photograph. No appreciabl�changes fioni the 1936 aerial E�h<�to�raph are visible. I 960 (I :1000. 13&VV) l he subject site and vicinity are visible in the 1960 aerial photograph. "i�he Site appears as undeveloped forested land. The subject site is bordered to thc north, south. �vest. and east bv a mix of forested land and �I residential structures. '� I 1968 (1:1500, B&W) li The subject site and vicinitv are visible in the i 9G8 aeri�l photograph. No appreciable changes from the 1960 li 3 . � i:;itn. i�,� ;��i Itc.2c�o4 i ��a i i��:� � aerial h oto ra�h are visible. �I p �' � I 1974 (1:1500, B&W) "I he subject site and vicinity are visible in the 1974 aerial photograph. There is a single structure visible on the ��, cast side of the property. No appreciable changes to the surrounding area are visible from the 1968 aerial photograph. I� 1980 (1:1000, Color) � The subject site and vicinitv are visible in the 1980 aerial photograph. No appreciable changes from the 1974 aerial photograph are visible. 1990(1:1000, Color) "I'he subject site and vicinit}�are visible in the 1990 aerial photograph. 1�here are now t��o structures visible on the east side of tl�e propertv that appear to be the preexisting structure and a new structure directly south ofthe preexisting structure. No appreciable changes lo the s��rroundin� area are visible from the 1980 aeria( photograph ��ith the exception of an apartment comple� being built on the property directly north of the Site across Petrovitskv Road. 1995 (1:2000, Color) l�he subject site and vicinit��are visible in the 199�aerial photograph. No appreciable changes from the 1990 ' aerial photograph are visible. 2000 (1.2000, Color) l�he subject site and vicinity are visible in the 2000 aerial photograph. No appreciable changes from the 1995 aerial photograph are visible. 2002 (1:l 680, Color) 'l�he subject site and vicinity are visible in the 2002 aerial photograph. No appreciable changes from the 2000 aerial photograph are visible. 2.3 Sanborn I�ire Insurance_R1aps and Nolk's_Cit,� Directories Sanborn Fire lnsurance Maps assist in the identification of historic land use and commonly indicate the existence and location ofaboveground and underground storage tanks,structures, improvements and facility operations. No Sanhorn 1�9aps�i�cre reported to bc available for the Site in the EDR Historic 1�9ap Collection. Polk's City Directories�re used as a reference resource in helping to detennine the historic use of a property. �� I'olk's City Directories documenl the names of businesses by street address. Often times, the name of the business can assist in detennining the property use and associated environmenta) risk potential. E3RA contracted EDR to summarize historic City Directories for the Site. City Directory information pertaining to the Site for the years 1964 through 1996 were researched. The subject site is listed in the Polk's City I)irectories researched as a residence from 1977 to 1987. All of the neighboring sites listed in the Polk's City Directories were residences or apartments��ith the exception of 1 l 725 SE Petrovitsky Rd.,which was listed as a Diesel Parts& Service in 1987. The complete City Directory summary including neighboring properties is listed in Appendix B,EDR Environmental Database Summary. a � � Ii3f2�1. Inc. August 18,2E104 l 041 1(,�1 ' 2.4 Environmental Database Search As part of this Phase I ESA,E3 RA contracted Environmental Data Resources,lnc.(EDR)to conduct a search or federal and state environmental databases. Based on the address of the Site, the database searches were completed to assist in the identification of conditions at the Site and within a radius distance specified in AS"TM Standard E 1527-00.The ASTM search radii for each database are noted in parentheses. The following databases �vere searched�r�ith the findings as noted. 2.�.1 Federal Databases 1. National I'riority List(NPL)—(1 mile)The NPL is the EPA's database of uncontrolled or abandoned hazardous«�aste sites identified for priority remedial actions under the Superfund program. FINDING: According to the databases searched, the Site was not on the NPL. No sites within a one-mile radius orthe Site ��ere on the NPL. 2. Comprehensive Environmental Response, Compensation and Liability Information System (CERCLIS)—(1/2 mile)The CERCLIS List contains sites�vhich are either proposed to or on the NPL and sites ��-hich are in the screening and assessment phase for possible inclusion on the NPL. F1NDING: According to the databases searched, the Site was not on the CERCLIS List. No sites within a half-mile radius of the Site were on the CERCLIS List. ' i. No Further Kemedial Action Planned (NFRAP)Sites Report—(1/4 mile)NFRAP sites may be sites , �vhere,following an initial investigation,no contamination was found,contamination was removed quickly,or the contamination was not serious enough to require Federal Superfund action or NPL Consideration. I�1NDING: According to the databases searched,the Site was not listed in the NFRAP Sites Report.No sites ' within a one-quarter mile radius of the Site were on the NFRAP listings. I�i �l. Resource Conservation and Recover-y Act Corrective Action (CORRACTS)Report—(1 mile)The t�,PA maintains this database of RCRA facilities which are undergoing"corrective action". A"corrective action I� order" is issued pursuant to RCRA Section 3008(h) when there has been a release of hazardous �i�aste or constituents into the environment from a RCRA facility. FINDING: According to the databases searched, the Site was not listed in the CORRACTS Report. No sites �vithin one-mile radius of the Site�r�ere listed in the CORRACTS Report. �. Resource Conservation and Recovery lnformation System Treatment, Storage and Disposal 1�acilities(RCRIS-TSD)Report—(1/2 mile)The EPA's RCRIS Program identifies and tracks hazardous waste �I fi-om the point ofgeneration to the point ofdisposal. The RCRIS-TSD database is a compilation by the EPA of I f�icilities which treat, store, and/or dispose of hazardous waste. l�1ND1NG: According to the databases searched,the Site ��as not listed in the RCRIS-"T SD Report. No sites ��ithin a half-►nile radius of the Site were listed in the RCRIS-TSD Report. ' 6. Resource Conservation and Recovery Information System Large Quantity Generators (RCR1S- LQG) Report — (I!4 mile) "I'he RCRIS database is a compilation by the EPA of facilities, ��-hich report 5 ' ' 1;3Rn. Inc. nugust 18.2004 r ua�i��,� " generation, storage, transportation,treatment or disposal of hazardous waste. Facilities listed on tlie RCRIS- LQG report generate at least 1,000 kilograms(kg)per month of non-acutely hazardous waste(or 1 kg/month of acutelv hazardous waste. FINDING: According to the databases searched,the Site was not listed in the RCRIS-LQG Report. No sites within a quarler-mile radius of the Site were listed in the RCRIS-LQG Report. 7. Resource Conservation and Recovery Information System Small Quantity Generators (RCR1S-SQG)Report—(1/4 mile)The EPA's RCRA Program identifies and tracks hazardous waste from the point of generation t� the point of disposal. Facilities listed on RCRIS-SQG database generate less than ],000 kilograms(kg) per month of non-acutely hazardous waste. I�INDING: /lccording to the databases searched,the Site was not listed in the RCRIS-SQG Report. No sites within a quarter-mile radius of the Site �vere listed in the RCIZIS-SQG Report. 8. Emergency Response Notification System (ERNS)—(Target Propert_y) ERNS is a national database containing records on reported releases of oil and hazardous substances. FINDWG: According to the databases searched, the Site was not listed in the ERNS. 9. Toxic Chemical Release Inventory System(TRIS)—(Target Property)TRIS identifies facilities which release toxic chemicals to the air, water and land in reportable quantities under Section 313 of the Emergency I Planning and Commw�ity Right-to-Know Act(also known as SARA Title 111). F1NDING: According to the databases searched, the Site was not listed in the TRIS Database. 2.4.2 State Databases l. Washington Confirmed & Suspected Contaminated Sites List (CSCSL) — (1 mile) The State Hazardous W aste Sites records are the states'equivalent to CERCLIS. These sites may or may not already be listed on the federal CERGLIS list. Priority sites planned for cleanup using state funds (state equivalent of Superfund) are identified along with sites H�here cleanup will be paid for by potentially responsible parties. The data comes from the Department of Ecology's Confirmed & Suspected Contaminated Sites List. FINDING: According to the databases searched, the Site was not listed in the CSCSL database. Four sites �vithin a mile radius of the Site were listed in the CSCSL database. SITr NAtiIC ADDRESS DISTANCE/ DISPOS1TlON DIR�CTIONS Not reported 16840 I 16' Ave. SE 1/4-1/2 Mile/North- Soil and Ground��ater Contaminated, Northwest Ground�vater and Soil Listed as Still Contaminated Not reported 17023 1 13' Ave. SE 1/4-1/2 Mile/ Contamination Unknown, Site Suspected Northwest of Being Contaminated Based on Preliminar}� lm-estigation and Past Use as a Manufacturing Facility 6 ' � I?3Rn, Inc. nugust 18.20b4 I�U41 16i1 , Not reported 17403 108'h Ave. SE 1/2-1 Mile/West- Soil Contaminated, Final Independent Northwest Remedia) Action Repori Received at Ecology Oil Express 17642 108` Ave. SE 1/2-1 Mile/West Soil and Groundwater Contaminated, Renton Groundwater and Soi) Listed as Still Contam inated 2. Washington Confirmed &S�spected Contaminated Sites List No FurtherAction (CSCSL NP'A)— (1/2 mile)CSCSL is a compilation ofabout sites previously on the CSCL list that have received a No Further Action (NFA)from the Department of Ecology(Ecology). The CSCSL NFA list was most recently updated Januan' 2004. FINDING: According to the databases searched,the Site was not listed in the CSCSL NFA database. No sites �vithin a half-mile radius of the Site �vere listed in the CSCSL NFn database. 2. Registered Underground Storage Tanks(UST)—(1/4 mile)The UST database reports registered US'i's provided by the Department of Ecology. FINDING: According to the databases searched,the Site was not listed in the UST Database. One site within a quarter-mile radius ofthe Site was listed in the UST database. The site is 1/8-1/4 mile up gradient to the east and is listed as having one leaded gasoline tank that has been removed. 3. Leaking Underground Storage Tanks(LUST)—(1/2 mile)The LUS 1'rcports contain an inventory of reported underground storage tank incidents. The data comes from Ecology's Leaking Underground Slorage Tanks Site List. FINDING: According to the databases searched, the Site was not listed in the LUST Database. No sites ��ithin a half-mile radius ofthe Site�i�ere listed in the LUST database. 4. Washington Independent Cleanup Reports(ICR)—(1/2 mile)ICR reports are remedial action reports Ecology has received for actions that have been conducted without Ecology oversight or approval and are not under an order or decree. F1NDING: According to the databases searched,the Site��as not listed in the 1CK Repoi�t. No sites��ithin a half-mile radius of the Site were listed in the 1CR Report. 5. Voluntary Cleanup Program (VCP) —(1/2 mile) "fhis database is a listing of sites that have entered either the Voluntary Cleanup Program or its predecessor Independent Remedial Action Program. FINDING: According to the databases searched,the Site was not listed in the VCP Report. No sites�r ithin a half-mile radius of the Site were listed in the VCP Report. 6. Solid Waste Facility Database (SWF/LF)—(1/2 mile) "I�his database is provided by the Ecolog}� and I contains a list of solid waste disposal facilities or landfills in Washington State;these may be active or inactive I facilities or open dumps that failed to meet RCRA Subtitle D Section 4004 criteria for solid waste landfills or �I disposal sites. � ' F:3R.A, Inc. ilugust i8,2004 "l�OA 1 16A F1NDING: According to the databases searched,the Site was not listed in the SWF/LF Report.No sites within a half-mile radius of the Site were listed in the SWF/LF Report. 2.43 Omhan Sites The EDR Environmental Database review provides a list of sites �vhich ��-ere not able to be mapped (hence `orphan' sites). Sites may be unmappable due to incomplete information from regulating agencies,the age of the report, or a varien� of other reasons. Orphan sites near the subject site are listed in the EDR report. Specifics regarding the reasons for the listings are not available. Sites tisted in the Orphan summary can be reviewed in the attached EDR Database Summary. 3.d SITE R�CONNAISSANCE E3RA completed a Site reconnaissance ofthe Property on August 3`d, 2004. The Site inspection included a walkover of the propert_y and visual observations of adjacent properties as viewed from the Site and surrounding road�vays.The visual reconnaissance of the subject site��-as conducted on foot and photographs of relevant site features were taken (See Appendix A, Photographs of the Site). No stained soils, stained pavement,distressed vegetation,evidence of above-or below-ground product storage,or chemical storage was observed on the parcet #6196600381. There were multiple piles of construction debris, including roofing materials and metal piping,and yard waste spread throughout the parcel. There were also multiple pieces of • scrap metal, including an automobile hood and bumper spread throughout the parcel. There was also an old freezer in the western portion of the parcel. There was also �i�hat appeared to be an old foundation in the middle of the parcel, including a concrete pad and concrete masonry unit(C1�9 U) wall. No stained soils,stained pavement,distressed vegetation,evidence of above-or belo«�-ground product storage was observed on Parcel#6196600380. There were gasoline and automotive and household chemicals stored onsite,but all appeared to be stored properly in smal)quantities and there was no visual indication ofany leaks. In general the parcel appeared in relatively good order with no visuall�� discernable evidence of kno�vn or suspected environmenlal conditions. 3_1 Phvsical Settin� The subject site ��as visually inspected on-foot. The subject site, encompassing approximately 3.87 acres, slopes to the north. Tax assessor records indicate one property as vacant land and the other as a single family residentia{. Visual reconnaissance ofthe Site confirmed that one ofthe parcels is undeveloped and the other has a mobile home,garage,and sheds on it.The developed site is being used by MKM Construction,Inc.and is no longer a single family residence. The Site is bordered by 1 18'�' Avenue Southeast to the �vest and Southeast Petro��i[sky Road to the north, and a mi�ture of re-sidential and undevcloped properties. 8 ' ' f?3Rn, Inc. �lugust f8,2004 '1�041 I GA � # 3.2 Environmentai SettinQ 32.1 Site Geolo�y, I lydro�eologv,and soils E3RA's understanding of subsurface conditions is based upon familiarity tivith the area through other projects in the vicinity, as well as upon supporting documentation concerning regional, locat, and on-site subsurface , conditions. I I The surficial geology in the project area is dominated by the most recent glacial period,the Vashon Stade of � the Frasier Glaciation. During this period, ice from alpine and valley glaciers from the Cascade Range in British Columbia and Washington State, from the Coast Range in British Columbia, and from a continental glacier that covered much of northern, inland North America, coalesced to form a lobe of glacial ice that flowed to the south on the west side of the Cascade Range. "l'his glacial lobe scoured out present-day Nuget Sound and deposited vast amounts of glacial material in the Puget Lowlands. Generally, soils deposited by ]arge glaciers are comprised of three prominent types. The first of these is advance glacia) outwash, which is comprised mostly of sand and gravel derived from glacial melt water streams that flow from the terminus and in front of the advancing glacier. The second is lodgement glacial till, densely consolidated and deposited at the base of the glacier. `I�he third is recessional glaciat outwash, deposited by melt water streams as the glacier receded from the area. Post-glacial soils in the area consist mostly of river deposits and organic rich soils, such as muck and peat, formed on poorly drained areas of glacial till plains. Our subsurface explorations indicate that glacial soils underlie the upland and some ofthe lowland areas ofthe site. Soils on the �vetland areas of the site, where no subsurface explorations �irere conducted, have been mapped by others as post-glacial muck. Although groundwater flow direction is difficult to predict ��rithout installing at least three monitoring wells and observing surveyed water leve[s over time,the probably flow direction is provided to assess potential on- site and off-site contamination migration trends. Groundwater flo��direction is important, as it indicates the direction to��ard which dissolved contaminants are most likely to migrate. Based upon the local topography and regional geology,ground��rater flow direction is considered likely to be toward the southwest. However, variations in this inrerred near-surface groundwater flo��r direction, if any, would remain uncharacterized without performing work beyond the scope of this Phase I ESA study. 3.22 Adjacent Properties i� The subject site is bordered to the north by residential development, to the east by undeveloped land,to the south by a residential development, and to the west by residential development. Visual observations of properties bordering the Site generafly did not.reveal indications that would indicate potential adverse impacts to the subject site. 9 ' � Ii3Rn. lnc. Au�usl 1R.2004 I'U4116n f 3 3 Under�round StoraQe Tanks(USTS) E3RA performed a visual reconnaissance of the subject site. No direct visual indications of USTs were observed on the subject site. 3_4 Aboveground Storage Tanks(ASTS) E3RA perTormed a visual reconnaissance of the subject site. No direct visual indications of ASTs were observed on the subject site. 3.5 Utilities The City of Renton provides domestic water service. I'uget Sound Energy supplies natural gas service to the site. I 3.6 Chemical Use and StoraQe No visual indications of chemical use and/or storage were observed on the undeveloped parcel. There��ras gasoline and a�tomotive and household chemicals stored on the developed parcel,but all appeared to be stored properly in small quantities and there was no visual indication of any leaks. 3.7 Solid Waste 1 Based upon visual observations,solid waste is thought to be limited to the construction debris,scrap metal,an old freezer, and yard waste spread throughout the undeveloped parcel. The developed parcel is currently � serviced by Waste Management. 3_8 W astewater Wastewater generated onsite b�- MKM Construction, Inc. is disposed of through an onsite septic system. 3.9 Stormwater No stormwater collection devices��vere observed on the Site. Based upon visual observations, surface water �vould likely migrate according to local topography and percolate into near-surface soils. � 3.10 Polychlorinated Biphenvls(PCBS) No visual evidence of potentially PCB-containing equipment was observed on the subject site. 3.11 Spills/Releases No visual evidence of chemical spills or releases was observed on the subject site. E3RA contacted City of Renton Fire Department to inquire whether the Site had been the subject of any hazardous material releases and/or responses. There was no response record of any releases at the site. 3.12 CERCLA Liabilit Potential Y The Site is not listed on the NPL or in the Docket database. �o �"� 122 2156'°'X :Z2 20000^W 12218333°W 122 1666.'°W 'NG�84 122 15000°W 1 � �� r f -'�,�• � +, L � ��j=! p �,M - d �- �,, ...,, , ,. , �, � , �, b I. '. 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Renton, WA 98058 Inquiry Number: 1241001.2s The Standard in Environmental Risk Management Information Jul�- 30, 2004 440 Wheelers Farms Road Milford, Connecticut 06460 Nationwide Customer Service Telephone: 1-800-352-0050 Fax: 1-800-231-6802 Internet: www.edrnet.com ,�N�a., , EXECUTIVE SUMMARY A search of available environmental records was conducted by Environmental Data Resources, Inc. (EDR). The report meets the government records search requirements of ASTM Standard Practice for Environmental Site Assessments, E 1527-00. Search distances are per ASTM standard or custom distances requested by the user. TARGET PROPERTY INFORMATIOM ADDRESS 11805 SE PETROVITSKY RD. RENTON,WA 98058 COORDINATES Latitude(North): 47.445200-47° 26'42.7" Longiiude(West): 122.183400- 122' 11'�.2" Universal Tranverse Mercator: Zone 1� UTM X(Meters): 561566.6 UTM Y(Meters): 5254744.0 Elevation: 400 ft. above sea level USGS TOPOGRAPHIC MAP ASSOCIATED WITH TARGET PROPERTY Target Property: 47122-D2 RENTON,WA Source: USGS 7.5 min quad index TARGET PROPERTY SEARCH RESULTS The target property was not listed in any of the databases searched by EDR. DATABASES WITH NO MAPPED SITES No mapped sites were found in EDR's search of available ( "reasonably ascertainable ") government records either on the target property or within the ASTM E 1527-00 search radius around the target property for the following databases: FEDERAL ASTM STANDARD NPL_____________________ National Priority List Proposed NPL______________ Proposed National Priorily List Sites CERCLIS____________________ Comprehensive Environmental Response,Compensation,and Liability Information System CERC-NFRAP_______________ CERCUS No Further Remedial Action Planned CORRACTS__________________Corrective Action Report RCRIS-TSD__________________ Resource Conservation and Recovery Information System RCRIS-LQG__________________ Resource Conservation and Recovery Information System RCRIS-SQG_________________. Resource Conservation and Recovery Information System ERNS________________________ Emergency Response Notification System STATE ASTM STANDARD HSL_______.____________ HazardousSitesList ; TC1241001.2s EXECUTIVE SUMMARY 1 ,� - EXECUTIVE SUMMARY . } SWFILF______________________ Solid Waste Facility Database LUST________________________ Leaking Underground Storage Tanks Site List � VCP _________________________VoluntaryCleanupProgramSites ''� INDIAN LUST________________ Leaking Underground Storage Tanks on indian Land � INDIAN UST_________________.Underground Storage Tanks on Indian Land � FEDERALASTM SUPPLEMENTAL I CONSENT___________________ Superfund(CERCLA)Consent Decrees ROD_____________________ RecordsOfDecision � Delisted NPL________________.National Priority List Deleiions FI NDS_______________________.Facility Index System/Facility Identification Initiative Program Summary Report HMIRS_______________________ Hazardous Materials Information Reporting System MLTS________________________ Material Licensing Tracking System MINES____________________ Mines Master Index File NPL Liens___________________ Federal Superfund Liens PADS________________________ PCB Activity Database System US BROWNFIELDS__________A Listing of Brownfields Sites INDIAN RESERV_____________ Indian Reservations , FUDS________________________ Formerly Used Defense Sites I UMTRl1____________________ UraniumMillTailingsSites DOD_________________________ Department of Defense Sites RAATS_______________________RCRA Administrative Action Tracking System TRIS_________________________ Toxic Chemical Release Inventory System TSCQ_______________________ ToxicSubstancesControlAct SSTS______________________.Section 7 Tracking Systems FTTS INSP___________________ FIFRA/TSCA Tracking System-FIFRA(Federat Insecticide, Fungicide,8� Rodenticide Act)/TSCA(Toxic Substances Control Act) I f STATE OR LOCAL ASTM SUPPLEMENTAL CSCSL NFA________________.Confirmed 8 Contaminated Sites-No Further Action WA ICR_____________________ Independent Cleanup Reports SPILLS____________________ ReportedSpills CDL__________________________ Clandestine Drug Lab Contaminated Site List AST__________________________Aboveground Storage Tank Locations EMI__________________________ Washington Emissions Data System EDR PROPRIETARY HISTORICAL DATABASES Coal Gas____________________ Former Manufactured Gas(Coal Gas)Sites BROWNFIELDS DATABASES US BROWNFIELDS_.________ A Listing of Brownfields Sites VCP_.________________.Voluntary Cleanup Program Sites INST CONTROL_____________ Institutional Controt Site List SURROUNDING SITES:SEARCH RESULTS Surrounding sites were identified. TC1241001.25 EXECUTIVE SUMMARY 2 EXECUTIVE SUMMARY Elevations have been determined from the USGS Digital Elevation Model and should be evaluated on a relative (not an absolute) basis. Relative elevation information between sites of close proximity should be field verified. Sites with an elevation equai to or higher than the targei property have been differentiated below from sites wilh an elevation lower than the target property. Page numbers and map identification numbers refer to the EDR Radius Map report where detailed data on individual sites can be reviewed_ Sites listed in bofd italics are in multiple databases. Unmappable(orphan)sites are not considered ir the foregoing analysis. STATE ASTM STANDARD CSCSL: The State Hazardous Waste Sites records are the states' equivalent to CERCLIS. These sites may or may not already be listed on the federal CERCLIS list. Priority sites planned for cleanup using state funds (state equivalent oi Superfund) are identified along with sites where cleanup will be paid for by potentially responsible parties. The data come from the Department ot Ecology's Confirmed 8 Suspected Contaminated Sites List. A review of the CSCSL list, as provided by EDR, has revealed that there are 4 CSCSL sites within approximately 1 mile of the target property. EquallHigher Elevation Address Dist/Dir Map ID Page Not reported 1684�116TH AVE SE 1/4- 1/2NNW 2 6 Not reported 17023 113TH AVE SE 1/4- 1/2NW 3 7 ; Not reported 17403 108TH AVE SE 1/2- 1 WNW 5 9 Lower Elevation Address Dist/Dir Map ID Page OIL EXPRESS RENTON 17642 108TH AVE SE 1/2- 1 W 4 8 UST: The Underground Storage Tank database contains registered USTs. USTs are regulated under Subtitle I of the Resource Conservation and Recovery Act(RCRA).The data come from the Department of Ecology's Statewide UST SitelTank Report. A review of the UST list, as provided by EDR, and dated 04l07/2004 has revealed that there is 1 UST site within approximately 0.25 miles of the target property. Equal/Higher Elevation Address Disi/Dir Map ID Page RALPH P BOWEN 12328 SE PETROVITSKY RO 1/8- 1/4 E 1 6 , � TC1241001.2s EXECUTIVE SUMMARY 3 � � i � Map ID MAP FINDINGS Direction � �� Distance Distance(fl.) EDR ID Number Elevation Site Dalabase(s) EPA ID Number (Continued) S105992081 Polychlorinated biPhenyls(PCBs): Not reporled Pesticides: Not reported Pelroleum Products: Suspected lo be presenl I Phenolic Compounds: Not reported I Non-Halogenated Solvents: Not reported I Dioxin_ Not reported I Polynuclear Aroma6c Hydrocarbons(PAH): Not reported Reactive Wastes: Not reported Corrosive Wastes: Not reported Radioactive Wastes: Not reported Asbestos: Not reported Conventional Contaminants,Organic: Not reported Conventional Contaminants,Inorganic: Nol reported 4 OIL EXPRESS RENTON CSCSL 5105735388 West 17642 108TH AVE SE N1A 1/2-1 RENTON,WA 98056 3327 ft. Relative: SHWS: I Lower Facility ID: 25789174 , MTBE Code: Not reported I Actual: Responsible Unit:Northwest Region 399 ft. Lalitude: 47 26 41 Longitude: 122 11 47 � Ecology Sile Status relalive to the MTCA cleanup process: Independent Remedial Action I�dependent Site Status-those sites undergoing an independent cleanup: Final Independent Remedial Aciion Report received WARM Bin Number indicales the outcome of the Washington Ranking Model(WARM): Media Status: C(Confirmed)-The presence of hazardous substances above MTCA cleanup levels has been confirmed by laboratory analysis(or field determination in the case of pelroleum contamination) Affected Media: Soil Arsenic Code: Not reported BaselNeutral/Acid Organics: Not reported Halogenated Organic Compounds: Not reported Horizontal Collection Method: 4 EPA Priority Pollutants-Metals and Cyanide: Not reported Metals-Other non-priority pollutanl medals: Not reported Polychlorinated biPhenyls(PCBs): Not reporled Pesticides: Nof reported Petroleum Products: Confirmed above MTCA cleanup levels Phenolic Compounds: Not reported Non-Halogenated Solvents: Not reported Dioxin: Not reported Polynuclear Aromatic Hydrocarbons(PAH): Not reported Reactive Wastes: Nol reported Co�rosive Wasles: Not reported Radioactive Wastes: Nol reported Asbestos: Not reported Conventional Contaminants,Organic: Not reported Conventional Contaminants,Inorganic Not reported TC1241001.2s Page 8 Map ID � MAP FINDINGS I _` Direction � Oistance Distance(R.) EDR ID Number Elevation Site Database(s) EPA ID PJumber 5 CSCSL 5103398155 WNW 174�3 108TH AVE SE SPILLS NIA 112-1 RENTON,WA 98055 3407 ft. Relative: SHWS: Higher Facility ID: 34571263 MTBE Code: Not reported Actual: Responsible Unit:Northwesl Region 407 ft. Latilude: 47 26 46 Longitude: 122 11 50 Ecology Site Status relative to lhe MTCA cleanup process Independent Remedial Action Independent Siie Stalus-those sites undergoing an independenl cleanup Not reported WARM Bin Number indicates the outcome of the Washington Ranking Model(WARM) Media Siatus: C(Confirmed)-The presence o(hazardous subslances above MTCA cleanup levels has been confirmed by laboratory analysis(or field determination in the case of petroleum contamination) Affected Media: Ground Water Arsenic Code: Not reported BaselNeutraUAcid Organics: Not reported Halogenated Organic Compounds: Confirmed above MTCA cleanup levels Horizontal Collection Method: 4 EPA Priority Pollulants-Metals and Cyanide: Not reported Metals-Other non-priorily pollutant medals: Not reported Polychlorinated biPhenyls(PCBs): Not reported ) Pesticides: Not reported j Petroleum Producis: Not reported Phenolic Compounds: Nol reported Non-Halogenated Solvents: Nol reported Dioxin: Not reported Polynuclear Aromatic Hydrocarbons(PAH): Not reported Reactive Wasles: Not reported , Corrosive Wastes: Not reported Radioactive Wastes: Not repoRed Asbestos: Not reported Conventional Contaminants,Organic: Nol reported Conventional Contaminanls,Inorganic: Not reported Facility ID: 34571263 MTBE Code: Not reporled Responsible Unit:Northwest Region Lalitude: 47 26 46 Longitude: 122 11 50 Ecology Sile Status relative to the MTCA cleanup process: Independent Remedial Action IndependeM Site Stalus-ihose sites undergoing an independent cleanup Not reported , WARM Bin Number indicates the outcome o(the Washington Ranking Model(WARM): ', Media SlaWs: C(Confirmed)-The presence of hazardous substances above MTCA cleanup{evels has been co�firmed by laboralory analysis(or field determination in the case of petroleum contamination) AKected Media: Soil Arsenic Code: Not reported Base/NeutrallAcid Organics: Not reported Halogenated Organic Compounds: Confirmed above MTCA cleanup levels Horizontal Collection Melhod: 4 EPA Priority Pollutants-Melals and Cyanide: Not reported TC1241001.2s Page 9 Map ID MAP FINDINGS Direction � Distance Distance(ft.) EDR ID Number Elevation Site Database(s) EPA ID Number (Continued) S103398155 Metals-Other non-priority pollulant medals: Not reported Polychlorinated biPhenyls(PCBs): Not reported Pesticides: Not reported Petroleum Products: Nol reported Phenolic Compounds: Not reported Non-Halogenated Solvents: Not reported Dioxin: Not reported Polynuciear Aromatic Hydrocarbons(PAH): Not reporied Reactive Wastes: Not reported Corrosive Wastes: Not repoAed Radioactive Wastes: Not reported Asbesios: Not reported Conventional Contaminants,Organic: Not reporled Conventional Contami�anis,Inwganic: Not reported � � , � TC1241001.2s Page 10 . � ORPNAN�MMARY "� Ciry EDR ID Site Name Site Address Zip Database(s) RENTON S105687504 ARCO#4368lCRAIG INVESTMENTS INC. 17605 SE 108TH AVE. 98055 WA ICR RENTON 5103508447 NORTHWEST PIPELINE METER STATIONS 800 S 21ST ST. 98055 WA ICR RENTON 5103508440 NORTHWEST PIPELINE METER STATIONS 19241 SE 272ND AVE. 98055 WA ICR RENTON S106249820 BLENCOE DENTAL BUILDING 200 S.3RD 98055 WA ICR RENTON 1003035055 STERNOFF METALS CORP 1600 SW 43RD ST 98055 WA ICR,CERC-NFRAP RENTON S103508800 RENTON MUNICIPAL AIRPORT APPROXIMATELY 800 R.4INIER AVE. 98055 WA ICR RENTON S103507583 GOODYEAR SERVICE CENTER 207 3RD AVE. 98055 WA ICR RENTON 5103850497 CHEVRON#9 7111 19044 108TH AVE.SE/BENSON HWY 98055 WA ICR RENTON S103508537 PACCAR INC. 500 BLOCK OF HOUSER WAY N. 98055 WA ICR RENTON S103508538 PACCAR INC. 500 BLOCK OF HAUSER WAY N. 98055 WA ICR RENTON 5103508747 PUGET POWER/BOEING/PACIFIC NW GROU BUILDING 7-81-4 98055 WA ICR RENTON 5103503016 CHEVRON#9 9114 301 GRADY WAY 98055 SPILLS,WA ICR RENTON 5103505635 BOEING-RENTON BLDG.4-75 LOGAN AVE.N. 98055 WA ICR RENTON 5105454266 BOEING-RENTON FACILITY•BLDG.4 STH / LOGAN 98055 WA ICR RENTON S105454267 80EING-RENTON FACILITY-BLDGS 4 8TH / IOGAN 98055 WA ICR RENTON S105124678 R.P.CHARLEY AUTOMOTIVE 207 MAIN ST. 98055 WA ICR RENTON S103505575 BLACK RIVER CORP.PARKlfRACK A 8 B OAKSDALE AVE.SW/SW 7TH/MONSTE 98055 WA ICR RENTON 5103507539 G&M INVESTMENTS/GARDEN PLAZA 5TH / PARK BLDGS AT PARK AVE 98055 WA ICR RENTON 5104873217 PUGET SOUND ENERGY TALBOT HILL SUB 2400 S.PUGET DR. 98055 WA ICR RENTON 5105454402 PUGET POWER-TALBOT HILL SUBSTATI PUGET DRIVE SE / EDMON�S AVE 98058 WA ICR RENTON 5103503851 SOUND SUBARU 240/250 RAINIER AVE.S. 98055 WA ICR RENTON 5103509540 SOUND FORD RENTON 750 R,4INIER AVE. 98055 WA ICR RENTON S105454410 RENTON SHOPPING CENTER(EIGHT REPO RAINIER AVE.S. I SUNSET BLV 98055 WA ICR RENTON 5103511699 METRO EAST DIVISION RENTON TREATMENT PLANT 98055 WA ICR RENTON 5103503581 TARGET EQUIPMENT RENTALS(TWO REPO 18017 SE RENTON MAPLE 98058 WA ICR RENTON S105430735 BNSF SHATTUCK STREET DERAILMENT SHATTUCK I HOUSER STS 98055 CSCSL.VCP RENTON 1006366241 SUNSET VIEW APARTMENTS 2101 SW SUNSET BLVD 98055 CSCSL RENTON 1001969468 YOUNKER NISSAN 3920 E VALLEY HWY S 98055 RCRIS-SQG.FINDS RENTON 1003880386 C]UENDALL TERMINAL 4.503 LK WnSHINGTON BLVD N 98055 CERCUS TC12410012s Page11 ' ' --- --- --- - -- --- _ _ - - -- -- - - - __ - - -- - - ---- GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING � To maintain currency ot Ihe following federal and state databases.EDR contacts the appropriate governmental ager.cy on a monthly or quarterly basis,as required. Elapsed ASTM days: Provides confirmation ihat this EDR reporl meets or exceeds ihe 90-day updaling requiremerl of lhe ASTM standard. FEDERAL ASTM STANDARD RECORDS NPL: National Prioriiy List Source: EPA Telephone: N!A Nationai Priorities Lisl(Superfund)-The NPL is a subset ot CERCLIS and idenlifies over 1,200 sites for prionty cleanup under the Superfund Program.NPL sites may encompass relatively large areas.As such,EDR provides polygon coverage for over 1,000 NPL site boundaries produced by EPA's Environmental Photographic Interpretation Center (EPIC)and regional EPA ofiices. Date of Government Version:04/27/04 Date o(Data Arrival at EDR:05iO4r04 Date Made Active at EDR:05/21l04 Elapsed ASTM days:17 Database Release Frequency:Semi-Annually Date of Last EDR Contact 05/04/04 NPL Site Boundaries Sources� EPA's Environmental Photographic Inlerpretation Cenler(EPIC) Telephone:202-564-7333 EPA Region 1 EPA Region 6 Telephone 617-918-1 i43 Telephone 214-655-6659 EPA Region 3 EPA Region 8 Telephone 215-814-5418 Telephone 303-312-6774 � � EPA Region 4 Telephone 404-562-8033 Proposed NPL: Proposed National Priority List 5ites Source: EPA Telephone: N/A Date of Government Version:04/27/04 Date o(Dala Arrival at EDR:05/04/04 Date Made Active at EDR:05/21/04 Elapsed ASTM days: 17 Dalabase Release Frequency:Semi-Annually Dale of Last EDR Contact:05/04/04 � CERCLIS: Comprehensive Environmental Response,Compensation,and Liability Information Syslem Source: EPA Telephone: 703-413-0223 CERCLIS contains data on potentially hazardous waste sites that have been reported to the USEPA by slates,municipalities, private companies and private persons,pursuant to Section 103 of the Comprehensive Environmental Response,Compensation, Iand Liability Act(CERCLA).CERCLIS contains siles which are eilher proposed to or on the Natio�al Priorities Lisl(NPL)and sites which are in the screening and assessment phase for possible inclusion on the NPL. Date of Government Version:02f26l04 Date of Data Arrival at EDR:03/22/04 Date Made Active at EDR:04/02/04 Elapsed ASTM days: 11 Database Release Frequency:Quarterly Date of Last EDR Contact:06/23/04 CERCLIS-NFRAP: CERCLIS No Further Remedial Action Planned Source: EPA Telephone: 703-413-0223 As of February 1995,CERCLIS sites designated"No Further Remedial Action Planned"(NFRAP)have been removed (rom CERCLIS.NFRAP sites may be sites where,following an initial investigalion,no contamination was found, contamination was removed quickly without the need tor the site to be placed on the NPL,or the contamination was not serious enough to require Federal Superfund aclion or NPL consideration.EPA has removed approximalely 25,000 NFRAP sites to lift Ihe unintended barriers to the redevelopment of these properties and has archived them as historical records so EPA does not needlessly repeat the invesligatio�s in the future.This policy change is part of the EPA's Brownfields Redevelopment Program to help cities,stales,private investors and aHected citizens to promote economic redevelopment of unproductive urban sites. TC1241001.2s Page GR-1 , . GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING .� Date of Govemment Version:02/26/04 Date of Data Arrival at EDR:03/22/04 Date Made Active al EDR:04/02l04 Elapsed ASTM days: 11 Dalabase Release Frequency:Quarterly Date of Last EDR Contact 06!?3/04 CORRACTS: Corrective Action Report Source: EPA Telephone: 800-424-9346 CORRACTS identifies hazardous waste handlers with RCRA corrective action activity. Date of Government Version:03115/04 Date of Data Arrivai at EDR 03/25104 Dale Made Active at EDR:04/15/04 Elapsed ASTh1 days:21 Database Release Frequency:Semi-Annually Date oi Last EDR Contact 06/07I04 RCRIS: Resource Conservation and Recovery Information System Source: EPA Telephone: 800-424-9346 Resource Conservation and Recovery Information System.RCRIS includes selective in(ormation on sites which generate. iransport,store,Ireat and/or dispose of hazardous waste as defined by Ihe Resource Conservation and Recovery Act(RCRA).Conditionally exempt small quantity generators(CESQGs):generate less than 100 kg of hazardous waste,or less than 1 kg of acutely hazardous waste per month.Small quantily generators(SQGs):generate between 100 kg and 1,000 kg of hazardous wasle per month.Large quantity generators(LQGs):generale over 1,0�0 kilograms (kg)oF hazardous waste,or over 1 kg of acutely hazardous wasfe per month.Transporters are individuals or entities that move hazardous waste irom the generator oK-site to a facility that can recycle,treat,store,or dispose of the waste.TSDFs treat,store,or dispose of the waste. Date of Govemment Version:06l15l04 Date of Data Arrival at EDR:06/23/04 Dale Made Ac6ve at EDR:07120/04 Elapsed ASTM days:27 Database Release Frequency:Varies Date of Last EDR Conlact:06/23/04 ERNS: Emergency Response Notification System Source: National Response Center,United States Coas1 Guard Telephone: 202-260-2342 � Emergency Response Notificalion System.ERNS records and slores information on reported releases of oil and hazardous substances. Date of Government Version: 12/31/03 Date of Data Arrival at EDR:01f26/04 Date Made Active at EDR:03/12/04 Elapsed ASTM days:46 Database Release Frequency Annually Da1e of t asl EDR Contact 07/26104 FEDERAL ASTM SUPPLEMENTAL RECORDS BRS: Biennial Reporting Syslem Source: EPA/NTIS Telephon e: 800-424-9346 The Biennial Reporting System is a national system administered by the EPA thal collects data on the generation and managemenl of hazardous waste.BRS captures detailed data trom two groups: Large Quantity Generators(LQG) and Treatmenl,Storage,and Disposal Facilities. Date of Government Version:12/01/01 Date of Last EDR Contact:O6/22/04 Database Release Frequency:Biennially Date of Next Scheduled EDR Contact:09l13/04 CONSENT: Superiund(CERCLA)Consent Decrees Source: EPA Regional OKces Telephone: Varies Major legal settlements that establish responsibility and standards for cleanup at NPL(Superfund)sites.Released periodically by United States District Courls aHer settlement by parties to litigalion matters. Date of Governmenl Version:N/A Date of Last EDR Contact:N/A Database Release Frequency:Varies Date of Next Scheduled EDR Contact:N/A TC1241001.2s Page GR-2 . � GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING -�--� — —--- --— ----—— -- a ROD: Records Of Decision Source: EPA Telephone: 703-416-0223 Record of Decision.ROD documents mandate a permanent remedy at an NPL(Superfund)site containing technical and heallh in(ormation to aid in ihe cleanup. Date of Govemment Version=04/08/04 Date of Last EDR ContacC 07l07/04 Database Release Frequency Annually Date of Next Scheduled EDR Contact: 10l04104 DELISTED NPL: Nationai Priority List Deletions Source: EPA Te►ephone: N/A The National Oil and Hazardous Substances Pollution Contingency Plan(NCP)establishes the criteria that the EPA uses lo delete sites irom the NPL.In accordance with 40 CFR 360.425.(e),sites may be deleted from the NPL where no further response is appropriate Date of Government Version:04/27l04 Date of Lasi EDR Contact_05l04/04 Database Release Frequency:Quarterly Date of Next Scheduled EDR Contact:08102l04 FINDS: Facility Index System/Facility Identification Initiative Program Summary Report Source: EPA Telephone: N/A Facility Index System.FINDS contains both facility informalion and'pointers'to other sources that contain more detail. EDR includes the following FINDS dalabases in this report:PCS(Permit Compliance System),AIRS(Aerometric Information Retrieval System},DOCKET(Enforcement Docket used to manage and track information on civil judicial enforcement cases for all environmental statutes),FURS(Federal Underground fnjection Control),C-DOCKET(CriminaF Docket System used to track criminal enforcement actions for all environmental statutes),FFIS(Federal Facilities Information System),STATE(State Environmental Laws and Statutes),and PADS(PCB Aclivity Data System). Date of Government Versan:04/08/04 Date of Las[EDR Contact:07l06104 Database Release Frequency:Quarterly Dale of Next Scheduled EDR Contact: 10/04/04 � HMIRS: Hazardous Materials Information Reporting System Source: U.S.Departmenl of Transportation Telephone: 202-366�555 Hazardous Materials Incident Reporl System.HMIRS contains hazardous material spill incidents reported to DOT. ', Date of Govemment Version:02/17/04 Date of Last EDR Contact:04/20/04 Database Release Frequency:Annualty Date of Next Scheduled EDR Contact:07/19/04 MLTS: Material Licensing Tracking System 5ource: Nuclear Regulatory Commission Telephone: 301-415-7169 MLTS is maintained by the Nuclear Regulalory Commission and contains a list oi approximately 8,100 sites which possess or use radioaclive materials and which are subjecl lo NRC licensing requirements.To maintain currency, EDR contacls lhe Agency on a quarterly basis Date of Governmenl Version:04/19/04 Dale ot Last EDR Contact:07/O6l04 Database Release Frequency:Quarterly Date of Next Scheduled EDR Contacl:10/�4104 MINES: Mines Master Index File Source: Department of Labor,Mine Safety and Health Adminislration Telephone: 303-231-5959 Date of Government Version:03l05/04 Date of Last EDR Contact:06/30/04 Database Refease Frequency:Semi-Annually Date of Next Scheduled EDR Contacl:09/27/04 NPL LIENS: Federal 5uperfund Liens Source: EPA Telephone: 202-564-4267 Federal Superfund Liens.Under the authority granted the USEPA by the Comprehensive Environmental Response,Compensation and Liability Act(CERCLA)o(1980,the USEPA has the authority to file liens againsi real property in order to recover remedial action expendilures or when the property owner receives notification o(polential liability. USEPA compiles a listing oi filed notices oi Superfund Liens. I TC12410012s Page GR-3 'L _ . . GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING Date of Govemment Version: 10/15/91 Date of Last EDR Contact:05/24/04 Database Release Frequency:No Update Planned Date of Next Scheduled EDR Contact:08l23l04 PADS: PCB Activity Database System Source: EPA Telephone: 202-564-3887 PCB Activity Database.PADS identifies generators,transporlers,commercial storers and/or brokers a�d disposers ot PCB's who are required to notify the EPA of such activilies. Date of Government Version:03I30I04 Date of Last EDR Contact 05l12104 Database Release Frequency:Mnualiy Date of Next Scheduled EDR Contact:08/09/04 DOD: Deparlment of Defense Siles Source: USGS Telephone: 703-692-8801 This data set consists of federally owned or administered lands,administered by the Department o(Defense,that I have any area equal to or greater than 640 acres of the United States,Puerto Rico,and the U.S.Virgin Islands. � Dale o(Govemme�t Version: 10/01/03 Date o(Last EDR ContacC 05/14/04 I Database Release Frequency:Semi-Annually Date of Next Scheduled EDR Contact:08/09l04 � STORMWATER: Storm Waler General Permits Source: Environmental Protection Agency Telephone: 202 564-0746 A listing of all facilities with Storm Water General Permits. Date oi Government Version:N/A Date of Last E DR Contact:N!A � Database Release Frequency:Quarterly Date of Next Scheduled EDR Contacl N/A � INDIAN RESERV: Indian Reservations Source: USGS Telephone: 202-208-3710 This map layer porlrays Indian administered lands of the United States ihat have any area equal to or greater than 640 acres. Date of Government Version: 10101/03 Date oi Last EDR Contact 05/14l04 Database Release Frequency:Semi-Annually Date of Next Scheduled EDR Contact:08/09/04 US BROWNFIELDS: A Listing of Brownfields Siles Source: Environmental Prolection Agency Telephone: 202-566-2777 Included in the listing are brownfields properties addresses by Cooperative Agreement Recipients and brownfields properlies addressed by Targeled Brownfields Assessments.Targeted Brownfields Assessments-EPA's Targeled Brownfields �ssessments(TBA)program is designed lo help stales,iribes,and municipalities--especially those withoui EPA Brownfields Assessment Demonslration Pilots--minimize the uncertainties o(contamination oRen associated wilh brownfields. Under Ihe TBA program,EPA provides funding and/or technical assistance for environmenlal assessments at brownfields sites throughout the country.Targeted Brownfields Assessments supplement and work with olher efforts under EPA's Brownfields Initialive lo promote cleanup and redevelopment of brownfields.Cooperalive Agreement Recipients-States,political subdivisions,lerritories,and Indian tribes become BCRLF cooperative agreement recipients when they enter into BCRLF cooperative agreements with the U.S.EPA.EPA selects BCRLF cooperative agreement recipients based on a proposal and application process.BCRLF cooperative agreement recipienls must use EPA funds provided through BCRLF cooperative agreement for specified brownfields-related cleanup activities. Date ot Government Version:04/14l04 Date of Last EDR Contact:O6/14/04 Dalabase Release Frequency:Semi-Annually Date of Nexl Scheduled EDR Conlact:09l13/04 RMP: Risk Management Plans Source: Environmental Proteclion Agency Telephone� 202-564-8600 When Congress passed the Clean Air Act Amendments of 1990,it required EPA to publish regulations and guidance for chemical accidenl prevention at facilities using extremely hazardous substances.The Risk Management Program Rule(RMP Rule)was written to implement Section 112(r)of Ihese amendments.The rule,which built upon existing industry codes and standards,requires companies o/alI sizes thal use certain flammable and toxic substances to develop a Risk Management Program,which indudes a(n):Ha�ard assessment that details the potential eNecis of an accidental release,an accident history of the last five years,and an evalualion of worst-case and alternative accidental releases;Prevention program that includes safety precautions and maintenance,monitoring,and employee training measures:and Emergency response program that spells out emergency health care,employee training measures and procedures for informing the public and response agencies(e.g the fire department)should an accident occur. TC124100L2s Page GR-4 _ _ _ _ _ _-- _ - - __ _ _ _--- -- I- GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING � -- - _ - -- _ _ _- --- -----_ -_ _-----_-- __ -- ------ Date o(Govemment Version:04/13/04 Date of Last EDR Contact:06/21/04 Database Release Frequency:Quarterly Dale of Next Scheduled EDR Conlact:09/20/04 SSTS: Section 7 Tracking Systems Source: EPA Telephone: 202-564-5008 Seclion 7 of the Federal Insecticide,Fungicide and Rodenticide Act,as amended(92 Stat.829)requires all registered pesticide-producing establishments lo submit a report to the Environmental Protection Agency by March 1 st each year.Each establishment must repoR ihe types and amounts of pesticides,active ingredients and devices being produced,and those having been produced and sold or distributed in the pasl year. Date of Government Version: 12/31l01 Date oi Last EDR Contact:07/20/04 Database Release Frequency:Annually Date of Next Scheduled EDR Contact: 10/18/04 FTTS: FIFRA/TSCA Tracking System-FIFRA(Federal Insecticide,Fungicide,8 Rodeniicide Act)(fSCA(Toxic Substances Control Act) Source: EPA/O�ce of Prevenlion,Pesticides and Toxic Substances � Telephone: 202-564-2501 FTTS tracks administrative cases and pesticide enforcemenl actions and compliance activities relaied to FIFRA, TSCA and EPCRA(Emergency Planning and Community Right-to-Know Acl}.To maintain currency,EDR contacts the Agency on a quarterly basis. Dale of Govemmenl Version:U4/13/04 Date of Last EDR Contact:06/21l04 Database Release Frequency:Quarterly Date of Next Scheduled EDR Conlact:09/20/04 STATE OF WASHINGTON ASTM STANDARD RECORDS CSCSL: Con(irmed 8�Suspected Conlaminaled Sites List Source: Department of Ecology T elephone: 360-407-7200 State Hazardous Waste Sites.State hazardous waste site records are the states'equivalent to CERCLIS.These sites may or may not already be listed on the federal CERCLIS Iist.Priority sites planned for cleanup using siate funds I (state equivalenl of Superfund)are identified along with sites where cleanup will be paid for by potentially responsiWe parties.Available information varies by state. Date of Government Version:01/14/04 Date of Data Arrival at EDR:02l17/04 Date Made Active at EDR:03/02l04 Elapsed ASTM days: 14 Database Release Frequency:Semi-Annually Date of Last EDR Conlact 07/02/04 HSL: Hazardous Sites List Source: Deparlmenl of Ecology T e lephone: 360-407-7200 The Hazardous Sites List is a subset of the CSCSL Reporl.It includes sites which have been assessed and ranked using lhe Washington Ranking Method(WARM). Date of Government Version:04/25/04 Date of Dala Arriva�at EDR:04/16/04 Date Made Active at EDR:04l29f04 Elapsed ASTM days: 13 Database Release Frequency:Semi-Annually Date oi Lasl EDR Contact:06/07/04 SWFlLF: Solid Waste Facilily Database Source: Department of Ecology T ele phone: 360-407-6132 Solid Waste Facilities/Landfill Sites.SWFILF type records typically contain an inventory of solid waste disposal facilities or landfills in a particular state.Depending on the state,these may be active or inactive facilities or open dumps that failed to meel RCRA Subtille D Section 4004 criteria(or solid waste Iandfills or disposal sites. Dale of Governmenl Version: 10/01/03 Daie ot Data Arrival at EDR:11l05/03 Dale hlade Active al EDR: 12(10103 Elapsed ASTM days:35 Database Release Frequency:Annually Date of Last EDR ContacC 06/30l04 TC1241001 2s Page GR-6 � - -__- _ _ - -- ------ - - - - --- --- -- [ GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING �_ -----__ _ _ -- ---- _-- -- ---- ---- -- - -- --- - -- - -- ,�--, - LUST: Leaking Underground Storage Tanks Sile Lisl Source: Deparlment o(Ecology Telephone: 360-4d7-7200 Leaking Underground Storage Tank Incident Reports.IUST records contain an inventory o(reported leaking underground storage tank incidents.Not all states maintain these records,and the information stored varies by state. Date of Government Version:04107/04 Date of Data Arrivai at EDR:04/19I04 Date Made Active at EDR:05l19/04 Elapsed ASTM days:30 Database Release Frequency:Quarterly Date of Last EDR Contact:06l18104 UST: Underground Storage Tank Database Source: Department o(Ecology Telephone: 360-407-7170 Registered Underground Siorage Tanks.UST's are regulated under Subtitle I of the Resource Conservation and Recovery Act(RCRA)and must be registered with the state department responsible for administering the UST program.Available information varies by state program. Dale of Government Version.04/07/04 Dale of Data Arrival al EDR 04i19,�04 Date Made Active al EDR:05f13/04 Elapsed ASTM days:24 Database Release Frequency:Ouarterly Date of Last EDR Con[act OfI18;04 VCP: Voluntary Cleanup Program Sites Source: Deparlment ot Ecology Telephone: 360-407-7200 Sites that have entered eilher the Voluntary Cleanup Program or its predecessor Independent Remedial Action Program. Date of Government Version:05/18/(?4 Date of Data Arrival at EDR:05118l04 Dale Made Active at EDR:O6/18/04 Elapsed ASTM days:31 Database Release Frequency:Varies Date of L.ast EDR Contact:05I17/04 INDIAN UST: Underground Storage Tanks on Indian Land � Source: EPA Region 10 Telephone: 206-553-2857 Date of Government Version:06/23l04 Dale of Data Arrival at EDR 06�23;04 Date Made Active al EDR:07/12/04 Elapsed ASTM days: 19 Database Release Frequency:Varies Date of Last EDR Contacl:05/24/04 INDIAN LUST: Leaking Underground Storage Tanks on�ndian Land Source: EPA Region 10 T elephon e: 206-553-2857 LUSTs on Indian land in Naska,Idaho,Oregon and Washington Dale oi Govemment Version:06/23l04 Date of Data Arrival at EDR:06i23�04 Date Made Active at EDR:07/12/04 Elapsed ASTM days: 19 Database Release Frequency:Varies Date oF Last EDR Contacl:05/24104 STATE OF WASHINGTON ASTM SUPPLEMENTAL RECORDS CSCSL NFA: Confirmed&Contaminated Siles-No Further Action Source: Department ol Ecology Telephone: 360-4 07-7170 The data set contains information about siles previously on the Confirmed and Suspected Conlaminated Sites lisl that have received a No Further Action(NFA)determinalion.Because it is necessary to maintain historical records of sites that have been investigated and cleaned up,sites are not deleted from the database when cleanup activities are completed.Instead,a No Further Action code is entered based upon the type of NFA determination the site received. Date of Govemment Version:01/14/04 Date of Lasl EDR Conlacl:07/02104 Database Release Frequency:Semi-Annually Date of Next Scheduled EDR Co�tact:08l16l04 I� TC12410012s Page GR-7 GOVERNMENT RECORDS SEARCHED ! DATA CURRENCY TRACKING �_ --- - - _- - - __-- -- --- ____- ------- -- ------ --- ICR: Independent Cleanup Reporis Source: Departmenl of Ecology Telephone: 360-407-7200 These are remedial action reports Ecology has received from either the owner or operator of ihe sites.These actions have been conducted without department oversighi or approval and are not under an order or decree.This database is no longer updated by the Department of Ecdogy. Date ot Government Version: 12/01/02 Date of Last EDR Contact:06/29/04 Database Release Frequency:No Updale Planned Date of Next Scheduled EDR Contact:08/16/04 SPILLS: Reported Spilis Source: Department of Ecology Telephone: 360-407-7450 Spills reported to the Spilt Prevention,Preparedness and Response Division. Date of Govemment Version:07107/04 Date of Last EDR Contact:07/06/04 Database Release Frequency:Semi-Annually Date of Next Scheduled EDR Contact: 10/04/04 AST: Aboveground Storage Tank Locations Source: Department of Ecology Telephone: 360-407-7562 A listing of aboveground storage tank locations regulated by the Department of Ecology's Spill Prevenlion, Preparedness and Response Program. Date of Governmeni Version:03/OS/04 Date of Lasl EDR Contact:O6I01/04 Database Release Frequency:Varies Dale of Nexl Scheduled EDR Contact:08/30/04 CDL: Clandestine Drug Lab Contaminated Site List Source: Department of Heallh Telephone: 360-236-3380 Illegal methamphetamine labs use hazardous chemicals ihat create public heatth hazards.Chemicals and residues , can cause burns,respiratory and neurological damage,and death.Biological hazards associated with intravenous needles,feces,and blood also pose heaflh risks. Date of Govemment Version:05l27/04 Date of Last EDR Conlact:06/08/04 Database Release Frequency:Varies Date o(Next Scheduled EDR Contact:09l06I04 EMI: Washington Emissions Data System Source: Department of Ecology Telephone: 360-407-6040 Date of Governmenl Version: 12/31IO2 Date ot Lasl EDR Contac[:07/20/04 Database Release Frequency:Annually Dale ot Next Scheduled EDR Contact: 10/18/04 LOCAL RECORDS KING COUNTY: Abandoned Landfill Study in King County Source: Seatlle-Kirx�County Department ot Public Health Telephone: 206-296-4785 The King County Abandoned Landfill Survey was conducted from October through December 1984 by the Health DepartmenCs Environmental Health Division at the request of the King County Council.The primary objective of lhe survey was lo determine if any public health problems existed at the predetermined 24 sites. Date of Government Version:04/30/85 Date of Last EDR Contact: 10/21/94 Database Release Frequency:No Update Planned Date oi Next Scheduled EDR Contact:NJA TC1241001.2s Page GR-8 GOVERNMENT RECORDS SEARCHED ! DATA CURRENCY TRACKING --- - -- ---- -- � SEATTLE COUNTY: Abandoned Landfill Study in the City of Seattle Source: Seattle-King County Department of Public Health Telephone: 206-296-4785 The Seattle Abandoned Landfill Survey was conducted in June and July o(1984 by the Health Departmenl's Environmental Health Division at the request of the Mayor s Office.The primary objective of the survey was to determine if any public healih problems existed af the predetermined 12 sites. Date o(Government Version:07/30/84 Date of Last EDR ContacC 10/21/94 Database Release Frequency:No Update Planned Date of Next Scheduled EDR Contacl Nrn SEATTLEIKING COUNTY: Seattle-King County Abandoned Landfill Toxicity 1 Hazard Assessment Project Source: Department of Public Heatth Telephone: 206-296-4785 This report presents lhe Seattle-King County Health Department's follow-up invesligation of two city owned and four county owned abandoned landfills which was conducted from February to December 1986. Date ot Government Version:12l31186 Date o(Last EDR Contact 08/14/95 Database Release Frequency:No Update P�anned Date of Next Schedufed EDR ContacL NiA SNOHOMISH COUNTY: Solid Waste Sites of Record at Snohomish Health District Source: Snohomish Health District Telephone: 206-339-5250 j Date of Government Version:01112104 Date of Lasl EDR Contact:07l20/04 I Database Release Frequency:Semi-Annually Date of Next Scheduled EDR Contact: 1�/18/04 TACOMA/PIERCE COUNTY: Closed Landfill Survey Source: Tacoma-Pierce County Health Department Telephone: 206-591-6500 Following numerous requests for information about closed dumpsites and landfills in Pierce Counly,the Tacoma-Pierce County Health Department decided to conduct a study on the matter.The aim of the study was to evaluale public health risks associated with the closed dumpsites and landfills,and to determine ihe need,if any,for further investigations ot a more detailed nature.The sites represent all of the known dumpsites and landfills closed after 1950. � Date of Government Version:09/01l02 Date of Last EDR Contact 03i19/03 Database Release Frequency:No Update Planned Date of Next Scheduled EDR Contact: NIA EDR PROPRIETARY HISTORICAL DATABASES Former Manufactured Gas(Coal Gas)Sites: The existence and location of Coal Gas siles is provided exclusively to EDR by Real Property Scan,Inc. OCopyright 1993 Real Properly Scan,Inc. For a technical description of the types of hazards which may be found al such sites,conlact your EDR customer service representative. � Disclaimer Provided b Real Pro rt Scan Inc. II Y PQ Y . The iniormation contained in this repoA has predominanlly been obtained from publicly available sources produced by entities , other than Real Property Scan. While reasonable steps have been taken lo insure the accuracy o(this report,Real Property Scan does not guarantee lhe accuracy of this report. Any liability on the pari oi Real Property Scan is strictly limited to a re(und of the amount paid. No claim is made for the actual exislence ot toxins at any site. This report does nol constitute a legal , . opinion. TC1241061.2s Page GR-9 . , GOVERNMENT RECORDS SEARCHED / DATA CURRENCY TRACKING �� ---- _ -- __-_ . _-- -------- _ -- --- - - BROWNFIELDS DATABASES VCP: Voluntary Cleanup Program Sites Source: Departmenl of Ecology Telephone: 360-407-7200 Sites that have entered either the Voluntary Cleanup Program or its predecessor Independent Remedial Action Program. , Date of Government Version:05I18/04 Date of Last EDR Contact:05/17l04 Dalabase Release Frequency:Varies Daie of Next Scheduled EDR Contacl:08l16/04 US BROWNFIELDS: A Listing of Brownfields Sites Source: Environmental Protection Agency Telephone: 202-566-2777 included in the listing are brownfields properties addresses by Cooperative Agreement Recipienls and brownfields properties addressed by Targeied Brownfields Assessments.Targeted Brownfields Assessments-EPA's Targeled Brownfields Assessme�ts(TBA)program is designed to help states,tribes,and municipalities--especially those withoul EPA Brownfields Assessment Demonstration Pilots--minimize the uncertainties of contamination often associaled with brownfields.Under the TBA program,EPA provides funding andlor technical assislance for environmental assessmenis at brow�tields siles Ihroughoul the country.Targeled Brownfields Assessmenls supplemenl and work with other efiorts under EPA's Brownfields Initiative to promote cleanup and redevelopment of brownfields.Cooperalive Agreement , Recipients-States,political subdivisions,territories,and Indian tribes become BCRLF cooperalive agreement recipients when they enter inlo BCRLF cooperative agreemenls with the U.S.EPA.EPA selects BCRLF cooperalive agreement recipients based on a proposal and application process.BCRLF cooperative agreement recipienis must use EPA funds provided through BCRLF cooperative agreement for specified brownfields-refated cleanup activities. Date of Government Version:NIA Date ot Last EDR Contact:N/A Database Release Frequency:Semi-Annually Dale ot Next Scheduled EDR Contact: N/A INST CONTROL: Institutional Control Site List Source: Department of Ecology Telephone: 360-407-7170 I Sites that have inslitutional conUols. I � Date of Govemment Version:06/08l04 Date of Last EDR Contact:06/08/04 ' Database Release Frequency:Varies Date o(Next Scheduled EDR Contact:09/06/04 i OTHER DATABASE(S) Depending on the geographic area covered by this report,the data provided in these specialty databases may or may not be complete. For example,the existence o(wellands intormation data in a specific report does not mean that all wetlands in the area covered by the report are induded. Moreover,the absence of any repoRed wetlands information does not necessarily mean that wetlands do not exist in the area covered by Ihe report. OillGas Pipelines:This data was obtained by EDR from the USGS in 1994.It is referred lo by USGS as GeoData Digilal Line Graphs from 1:100,000-Scale Maps.It was extracled from the transportation category including some oil,but primarily gas pipelines. Electric Power Transmission Line Data Source:PennWell Corporation Telephone:(800)823-6277 This map includes information copyrighted by Pe�nWell Corporalion.This iniormalion is provided on a besl efiort basis and PennWell Corporalion does not guaranlee its accuracy nor warrant ils fitness for any particular purpose. Such intormation has been reprinted with the permission of PennWell. Sensitive Receptors: There are individuals deemed sensitive receptors due to lheir tragile immune systems and special sensitivity to environmental discharges. These sensitive receptors typically include the elderly,the sick,and children. While the location of all sensitive receptors cannot be determined.EDR indicates those buildings and facilities-schools,daycares,hospitals,medical centers, and nursing homes-where individuals who are sensitive receptors are likely to be located. AHA Hospitals: Source:American Hospital Association.Inc. Telephone 312-280-5991 The database i�cludes a listing of hospitals based on the American Hospilal Association's annual survey of hospitals. TC12410012s PageGR-10 GOVERNMENT RECORDS SEARCHED 1 DATA CURRENCY TRACKING � � Medical Centers: Provider of Services Listing Source:Centers for Medicare&hledicaid Services Telephone:410-786-3000 A tisting ot hospitals with Medicare provider number,produced by Centers of Medicare 8�Medicaid Services, a federal agency within ihe U.S.Depariment of Health and Human Services. Nursing Homes I Source:National Institutes of Health i Telephone:301-594-6248 Information on Medicare and Medicaid certified nursing homes in the United States. Public Schools Source:National Center for Education Statistics Telephone:202-502-7300 The National Center tor Education Statistics'primary database on elementary and secondary public education in the United States. It is a comprehensive,annual,national slalistical database of all public elementary and secondary schools and school districts,which contains data thal are comparable across all slales. Private Schools Source:National Center for Educalion Stalislics Telephone:202-502-7300 The National Center for Educalion Statistics'primary dalabase on private school locations in the United States. Daycare Centers:Daycare Center Listing Source:Department ot Social 8 Heallh Services Telephone:253-383-1735 Flood Zone Data: This data,available in select counties across the country,was obtained by EDR in 1999 from the Federal Emergency Management Agency(FEMA). Data depicts 100-year and 500-year Oood zones as defined by FEMA. NWI: National Wetlands Inventory. This data,available in select counties across ihe country,was obtained by EDR in 2002 from the U.S.Fish and Wildli(e Service. STREET AND ADDRESS INFORMATtON OO 2003 Geographic Dala Technology,Inc.,Rel.07/2003.This product contains proprielary and confidential property of Geographic Data Technology,Inc.Unauthorized use,including copying for other than testing and slandard backup procedures,of this product is expressly prohibited. TC1241001 2s Page GR-11 „.-,� GEOCHECK�- PHYSICAL SETTING SOURCE ADDENDUM TARGET PROPERTY ADDRESS PETROVISTA DEVELOPMENT PHASE 1 ESA 11805 SE PETROVITSKY RD. RENTON,WA 98058 TARGET PROPERTY COORDINATES Latitude(North): 47.445202-47°26'42.7” Longitude(West): 122.183403- 122' 11'0.3" Universal Tranverse Mercator: Zone 10 UTM X(Meters): 561566.6 UTM Y(Meters): 5254744.0 Elevation: 400 ft.above sea level EDR's GeoCheck Physical Setting Source Addendum has been developed to assist the environmental protessional with the collection of physicat setting source information in accordance with ASTM 1527-00,Section 72.3. Section 72.3 requires that a current USGS 7.5 Minute Topographic Map(or equivalent,such as the USGS Digital Elevation Model)be reviewed. It also requires that one or more additional physical setting sources be sought when(1)conditions have been identified in which hazardous substances or petroleum products are likely to migrate t�or from the property,and(2)more information than is provided in the current USGS 7.5 Minute Topographic Map(or equivalent)is generally obtained,pursuant to local good commercial or customary practice, to assess the impact of migration of recognized environmental conditions in connection with the property. Such additional physical setting sources generally include information about the topographic,hydrologic,hydrogeologic, ��' � and geologic characteristics of a site,and wells in the area. Assessment of the impact of contaminant migration generally has two principle investigative components: 1.Groundwater flow direction,and 2.Groundwater flow velocity. Groundwater flow direction may be impacted by surface topography,hydrology,hydrogeology,characteristics o(the soil,and nearby wells. Groundwater flow velocity is generally impacted by the nature of the geologic strata. EDR's GeoCheck Physical Setting Source Addendum is provided to assist the environmental professional in forming an opinion about the impact of potential contaminant migration. } TC1241001.2s Page A-1 o� GEOCHECK� - PHYSICAL SETTING SOURCE SUMMARY GROUNDWATER FLOW DIRECTION INFORMATION Groundwater flow direction for a particular site is best determined by a qualified ernironmental professional using site-specific well data. If such data is not reasonably ascertainable, it may be necessary to rely on oiher sources of intormation,such as surface topographic information,hydrologic in(ormation,hydrogeologic data collected on nearby properties,and regional groundwater flow information(from deep aquifers). TOPOGRAPHIC INFORMATION Surface topography may be indicative of the direciion of surficial groundwater flow. This information can be used to assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or, should contamination exist on the target property,what downgradient siies might be impacted. TARGET PROPERTY TOPOGRAPHY USGS Topographic Map: 47122-D2 RENTON,WA General Topographic Gradient: General ENE Source: USGS 7.5 min quad index SURROUNDING TOPOGRAPHY:ELEVATION PROFILES r � A � O {� � � m y lO O -+ A � � ..W. AI N A A U � N � A 4r 1 � � A � O W . � ' � ' _ ' _ ' � ' � ' � ' � ' � ' _ " _ � " _ ' _ ' ' ' _ ' ' ' ' ' � ' ' ' � ' ' ' � ' � ' North South TP r � 0 A q p y� m A 1�6 A J > N ONi A A A IJ A A W m u p' a o o � w u e o W O O A A O ImD O m J N t�0 W � y�_ . . � . � . � . � . � . � . � . � � � . . � W O West East TP 0 1;2 1 Miles Target Property Elevation:400 ft. Source:Topography has been determined from the USGS 7_5' Digital Elevation Model and should be evaluated on a relative(not an absolute)basis. Relative elevation information between sites of close proximity should be field verified. TC1241001.2s Page A-2 , � �_�-, GEOCHECF(� - PHYSICAL SETTING SOURCE SUMMARY � Soil Layer Information Boundary Classification Layer Upper Lower Soil Texture Class AASHTO Group Unified Soil Permeabilit Soil Reaction Rate(inlhr) (pH) 1 0 inches 7 inches gravelly- Granular COARSE-GRAINED Max: 6.00 Max: 6.50 sandy loam materials(35 SOILS,Gravels, Min: 2_00 Min: 5.10 pct.or less Gravels wilh passing No. fines,Silty 200),Silty,or Gravel Clayey Gravel and Sand. 2 7 inches 35 inches very gravelly- Granular COARSE-GRAINED Max: 6.00 Max: 6.50 loam materials(35 SOILS,Gravels, Min 2.OU Min: 5.10 pct.or less Gravels with passing No. fines,Silty 200),Stone Gravei Fragments. Gravei and Sand. 3 35 inches 39 inches cemented Not reported Not reported Max: 0.00 Max: 0.00 Min: 0.00 Min: 0.00 OTHER SOIL TYPES IN AREA � Based on S�il Conservation Service STATSGO data,the following additional subordinant soil types may appear within ihe general area of iarget property. Soil Surface Textures: silt loam very gravelly-sandy loam Surficial Soil Types: silt loam very gravelly-sandy loam Shallow Soil Types: silt loam Deeper Soil Types: very gravelly-coarse sand stratified very gravefly-sand very gravelly-loamy sand ADDITIONAL ENVIRONMENTAL RECORD SOURCES � According to ASTM E 1527-00,Section 72.2,"one or more additional state or local sources of environmental records may be checked, in the discretion of the environmental professional,to enhance and supplement federaf and state sources... Factors to consider in determining which local or additional state records, if any,should be checked include(1)whether they are reasonably ascertainable, (2)whether they are sufficiently useful,accurate, and complete in light of the objective of the records review(see 7.1.1), and(3)whether they are obtained,pursuant to local,good commercial or customary practice." One oi the record sources listed in Section 7.2.2 is water well information. Water well information can be used to assisi the environmental professional in assessing sources that may impact groundwater flow direction,and in forming an opinion about the impact of contaminant migration on nearby drinking water wells. I i TC12410012s Page A-5 fs:_ GEOCHECK� - PHYSICAL SETTING SOURCE SUMMARY � - - - -- WELL SEARCH DISTANCE INFORMATION DATABASE SEARCH DISTANCE(miles) Federal USGS 1 000 Federal FRDS PWS Nearesl PWS within 1 mile Staie Database 1.000 FEDERAL USGS WELL INFORMATION LOCATION MAP ID WELL ID FROM TP 1 USGS1084488 1/4-1/2 Mile South 2 USGS1084546 114-1/2 Mile SE 3 USGS1084545 1/2-1 Mile SE � 4 USGS1084522 1/2-1 Mile SSE 6 USGS1084613 1/2-1 Mile WNW 7 USGS1084664 1!2- 1 Mile NE 8 USGS1084461 1!2- 1 Mile SSW A9 USGS1084597 1/2-1 Mile West A10 USGS1084644 112- 1 Mile West FEDERAL FRDS PUBLIC WATER SUPPLY SYSTEM INFORMATION LOCATION MAP ID WELL ID FROM TP No PWS System Found Note: PWS Syslem localion is not always ihe same as well location STATE DATABASE WELL INFORMATION LOCATION MAP ID WELL ID FROM TP No Wells Found TC1241001.2s Page A-6 � � PHYSICAL SETTING SOURCE MAP - 1241001.2s �: i � i � � ,_ ! i' F� \ I I y' ' ` �,. ,.• ." ,� I ;I ' �i � �1 , I i \` � � ^ I � i �,� ,� 1 �� =,l � '. 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ADDRESS: 11805 SE Petrovitsky Rd. CONTACT: Chad Kean CITY/STATElZ�P: Renton WA 98058 INQUIRY�i: 1241001.25 LAT/LONG: 47.4452/122.1834 DATE: July 3Q,2004 3:38 pm Gop„ight n 2001 EDR.I�>�200J 60T.Inc.Rel O7/1W7 AM Riphts Reserved. GEOCHECK�- PHYSICAL SETTING SOURCE MAP FINDINGS Map ID Direction Distance Elevation Database EDR ID Number � South FED USGS USGS1084488 114-112 Mile Higher Agency: USGS Site ID: 472618122105301 Sile Name: 23N/05E-33E01 Dec.Latitude: 47.43816 Dec.Longitude: -122.18262 Coord Sys� NAD83 State: WA County: Ki�g County Allilude: 450 Hydrologic code: 17110013 Topographic: Hillside(slope) Site Type: Ground-water other than Spring Consl Dale: 19850820 Inven Date: 19661211 Well Type: Singie well,olher than collector or Ranney type Primary Aquifer: Not Reported Aquifer type: Not Reported Well depth: 136 Hole depth: 136 Source: driller Project no Not Reporled Ground-water levels,Number of Measurements: 1 Feet below Feet lo ' Dale Surface Sealevel 1985-OS-20 109 2 SE FED USGS USGS1084546 1/4-1!2 Mile Higher Agency: USGS Site ID: 472625122102901 Site Name: 23N/05E-33F01 Dec-Latitude: 47.4401 Dec.Longitude: -122.17595 Coord Sys: NAD83 State� WA County King Couniy Altitude: 400 Hydrologic code: 17110013 Topographic: Valley tlat Site Type: Ground-water ofher than Spring Const Date: 19790130 Inven Date: 19861211 Well Type: Single well,olher than collector or Ranney type Primary Aquiter: Nol Reporled Aquifer type: Not Reported Well depth: 105 Hole deplh: 105 Source: driller Project no: Not Reported TC1241001.2s Page A-8 GEOCHECKo- PHYSICAL SETTING SOURCE MAP FINDINGS � k Ground-water levels,Number of Measurements:4 Feet below Feet to Feet below Feet to Date Surface Sealevel Date Surface Sealevel 1987-04-14 55.23 1986-08-15 79.94 Note:The site was being pumped. 1986-07-18 60.21 1979-01-30 75 3 SE FED USGS USGS1084545 1!2-1 Mile Lower ' Agency: USGS Site ID: 472625122102401 Site Name: 23N/05E-33G01 Dec.Latitude: 47.4401 Dec.Longitude: -122.17456 Coord Sys: NAD83 State: WA County: King County Altitude: 400 Hydrologic code: 171 t0U13 Topographic: Vailey flat Site Type: Ground-water other than Spring Const Date: 19770927 inven Date: 19861211 Well Type: Single well,other than collector or Ranney[ype Primary Aquifer: Nol Reported Aquifer type: Not Reported Well depth 104 I Hole depth: 104 Source: driller Project no: Not Reporled Ground-water levels,Number of Measurements:3 Feet below Feet to Feel below Feel lo Date Surface Sealevel Date Surface Sealevel 1987-04-13 34.73 198608-15 37.96 1977-09-27 57 4 SSE FED USGS USGS1084522 112-1 Mile Higher Agency: USGS Site ID: 472609122103801 Site Name: 23N/05E-33L01 Dec.Latitude: 47.43677 Dec.Longitude: -122.17956 Coord Sys: NAD83 Staie: WA County: King County Altitude: 400 Hydrologic code: 17110013 Topographic: Nol Reported Site Type: Ground-water oiher than Spring Const Date: 19490615 Inven Date: Not Reported Well Type: Single well,olher than collector or Ranney type TC1241001.2s Page A-9 ,-� GEOCHECKo- PHYSICAL SETTING SOURCE MAP FINDINGS Primary Aquifec Not Reporled Aquifer rype: Not Reporled Weil depth: 100 Hole deplh: 196 Source: driller Project no: Not Reported Ground-water levels,Number of Measurements: 1 Feet below Feet to Date Surface Sealevel 1949-06-17 49 5 SitelD: 5343008758 West Groundwater Flow: SW AQUIFLOW 60980 1/2-1 Mile Shallowest Water Table Depth: 2.64 Lower Deepest Water Table Depth: 13.64 Average Water Table Depth: Not Reporied Date: 03/15/1999 6 WNW FED USGS USGS1084613 1/2-1 Mile Higher Agency. USGS Site ID: 472703122115201 Site Name: 23N105E-29L01 Dec.Latitude: 47.45066 Dec.Longitude: -122.19901 Coord Sys: NAD83 State: WA County: King County Altitude: 400 Hydrologic code: 1711Q013 Topographic: Not Reported Site Type: Ground-water other lhan Spring Const Date: 19850218 Inven Date: Not Reported Well Type: Single well,other than collector or Ranney lype Primary Aquifer: Not Reported Aquifer type: Not Reported Well depth: 67 Hole depth: 67 Source: driller Project no: Not Reported Ground-water levels,Number of Measurements:1 Feet below Feet to Date Surface Sealevel 1985-02-18 33 7 , NE FED USGS USGS1084664 1/2-1 Mile Higher TC1241001.2s Page A-10 • -- --- --- --- -- -- - -- GEOCHECKo- PHYSICAL SETTING S�URCE MAP FINDINGS � �� x�� ., I .�:, I Agency: USGS Site ID: 472710122100301 5ite Name: 23NlOSE-28H01 Dec.Latitude: 47.4526 I, Dec.Longitude: -122.16873 I Coord Sys: NAD83 , Slate: WA County: King County Altitude: 415 Hydrologic code: 17110012 Topographic: Not Reported Sile Type: Ground-water other than Spring Const Date: 19790405 Inven Date: Not Reported Well Type: Single well,other than collector or Ranney type Primary Aquifer: Not Reported Aquifer type: Not Reported ' Well depth: 100 Hole depth: 100 Source: driller i Project no: Not Reporied Ground-water levels,Number of Measurements:4 Feet below Feet to Feet below Feet to Date Surface Sealevel Date Surface Sealevel 1987-09-28 45.83 1987-04-13 38.15 198Cr07-18 43.25 1979-04-09 60 8 '• SSW FED USGS USGS1084461 1!2-1 Mile Higher Agency: USGS Site ID: 4 725551 221 1 1 1 01 Site Name: 23N/05E32R01 Dec_Latitude: 47.43177 Dec.Longitude: -122.18762 Coord Sys: NAD83 State: WA County: King County Aititude: 512 Hydrologic code: 17110013 Topographic: Not Reported Site Type: Ground-water other than Spring Const Date: 19010101 Inven Date: Not Reporied Well Type: Single weil,other than collector or Ranney type Primary Aquifer: Nol Reported Aquifer type: Not Reported Welt depth: 45 Hole depth: Not Reported Source: driller Project no: Nol Reported Ground-water levels,Number of Measurements:1 Feet below Feet to Date Surface Sealevel -------------------------------------- 1962-07-24 21.1 TC1241001.2s Page A-11 ♦ • GEOCHECK�- PHYSICAL SETTING SOURCE MAP FINDINGS � . RADON AREA RADON INFORMATION Federal EPA Radon Zone for KING County: 3 Note:Zone t indoor average level>4 pCilL. :Zone 2 indoor average level>=2 pCi/L and<=4 pCilL. :Zone 3 indoor average level<2 pCi/L. Federal Area Radon Informaiion for Zip Code: 98058 Number of sites tesled:5 Area Average Aclivity %<4 pCilL °�4-20 pCi/L %>20 pCi/L Living Area- 1st Floor 0.140 pCi/L 100% O�o 0% Living Area-2nd Floor Not Reported Nol Reported Not Reported Not Reported Basemenl -O.t00pCi/L 100% 0% 0% TC12410012s Page A-13 . • ---- - -- - ---- -- -_ -------- - - ---- -- - - -- �. I PHYSICAL _SETTING SOURCE RECORDS SEARCHED j '� `� TOPOGRAPHIC INFORMATION USGS 7.5'Digitai Elevation Model(DEM) Source: United Stales Geologic Survey EDR acquired the USGS 7.5'D'gital Elevation Model in 2002 7 5-Minute DEMs correspond to the USGS 124,00Q and 125,000-scale topographic quadrangle maps. HYDROLOGIC INFORMATION Flood Zone Data: This data,available in select counties across the country,was obtained by EDR in 1999 from the Federal Emergency Managemeni Agency(FEMA). Data depicls 100-year and 500-year flood zones as defined by FEMA. NWI: National Wetlands Inventory. This data,available in select counties across the counlry.was obtained by EDR in 2002 from the U.S.Fish and Wildlife Service HYDROGEOLOGIC INFORMATION AQUIFLOVYR Information System Source: EDR proprietary database o(groundwater flow iniormation EDR has developed the AQUIFLOW Information System(AIS)to provide data on the general direction o(groundwater tlow al spec'rfic poinis.EDR has reviewed reports submitted to regulatory authorities at select sites and has extracted the date of the report,hydrogeologically determined groundwater flow direction and depth lo water table information. GEOLOGIC INFORMATION Geologic Age and Rock Stratigraphic Unit Source:P.G.Schruben,R.E.Amdt and W.J.Bawiec,Geology of the Conterminous U S at 1:2,500.000 Scale-A digitai : � representation of the 1974 P.B.King and H_M.Beikman Map,USGS Digital Data Series DDS- 11 (1994). STATSGO: State Soil Geographic Database Source: Department of Agriculture,Natural Resources Conservation Services � The U.S. Departmenl of Agriculture's(USDA)Natural Resources Conservation Service(NRCS)leads the national Conservaiion Soil Survey(NCSS)and is responsible for collecting,storing,maintaining and distributing soil survey information(or privately owned lands in Ihe United States.A soil map in a sal survey is a representation of soil patterns in a landscape.Soil maps for STATSGO are compiled by generalizing more delailed(SSURGO) soil survey maps. I ADDITIONAL ENVIRONMENTAL RECORD SOURCES FEDERAL WATER WEILS PWS: Public Water Systems Source: EPAIOtfice of Drinking Water Telephone: 202-564-3750 Public Water System data from the Federal Reporting Data Syslem. A PWS is any water system which provides water to at least 25 people for at least 60 days annually. PWSs provide water from wells,rivers and other sources. PWS ENF: Public Water Systems Violation and Enforcement Dala Source: EPAlOffice of Drinking Water ' Telephone: 202-564-3750 Violalion and Enforcement data for Public Water Systems from the Safe Drinking Wa1er Information 5ystem(SDWIS)after August 1995. Prior lo August 1995,the data came from lhe Federal Reporting Data Syslem(FRDS). USGS Water Wells: USGS National Water Inventory System(NWIS) This database conlains descriptive information on sites where the USGS collects or has collected data on surlace water and/or grou�dwater.The groundwater data includes intormation on welfs,springs,and other sources of groundwater. TC1241001.2s Page A-14 I . � - - - -- -- -- - -- - - --- - _ - - -- - �- --. _ - --- ------ ----- - --- -- -- -- ---- - - I( PHYSICAL SETTING SOURCE RECORDS SEARCHED `{ ____ --- - . � STATE RECORDS Water Wells Source: Department of Transportation Telephone: 360-705-7444 Group A well location points in Washington State. Kitsap County Water Welis in Washington Source: Public Utility District No. 1 of Kitsap County Telephone- 206-779-7656 RADON Area Radon Information Source:USGS Telephone: 703-356-4020 The National Radon Dafabase has been developed by the U.S.Environmental Protection Agency (USEPA)and is a compilation of the EPA/State Residential Radon Survey and the National Residenfial Radon Survey The study covers the years 1986-1992.Where necessary data has been supplemented by informalion collecled at private sources such as universilies and research institutions. EPA Radon Zones Source: EPA Telephone: 703-356-4020 Sections 307 8 309 of IRAA directed EPA to lisl and identify areas of U.S.with the potential for elevated indoor radon tevels. OTHER Airport Landing Facilities: Private and public use landing facilities Source: Federal Aviation Administralion,800-457-6656 Epicenters: World earthquake epicenters,Richter 5 or greater Source: Department of Commerce,National Oceanic and Atmospheric Adminislration I } , TC1241001.2s Page A-15 . EDR`"Environmental �a Data Resources Inc � "Linking Technology with Tradition" I Sanborn0 Map Report Ship To: Chad Kean Order Date: 7/30i2004 Completion Date: 8/2/2004 E3RA, Inc. Inquiry #: 1241001.3s 201 160th Slreet South, P.O. #: NA Tacoma, WA 98444 Site Name: Petrovista Development Phase 1 ESA Address: 1 1805 SE Petrovitsky Rd. I Customer Project: T04116A CitylState: Renton, WA 98058 4014740KRA 253-537-9400 Cross Streets: This document reports that the largest and most complete collection of Sanborn fire insurance maps l�as been reviewed based on client supplied information, and fire insurance maps depicting the target property at the specified address were not identified. NO COVERAGE This report contai�s intormation obtained from a variety oi public and other sources. NO WARRANTY EXPRESSED OR IMPLIED,IS DdADE WHATSOEVER IN CONNECTION WITH THIS REPORT. ENVIRONMENTAL DATA RESOURCES.INC.SPECIFICALLY DISCLAIMS THE MAKING OF ANY SUCH WARRANTIES,INCLUDING WITHOUT LIMITATION, MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE. AlL RISK IS ASSUMED BY THE USER. IN NO EVENT SHALL EDR BE LIABLE TO ANYONE,WHETHER ARISING OUT OF ERRORS OR OMISSIONS,NEGLIGENCE,ACCIDENT OR ANY OTHER CAUSE,FOR ANY LOSS OR DAMAGE,INCLUDING,WITHOl1T LIMITATION,SPECIAL, INC�DENTAL,CONSFQUENTIAL,OR EXEMPLARY DAMAGES. N can not be concluded from this report thal coverage information(or lhe largel and surrounding propeAies does nol exist fi r sources.Any analyses,estimates,ralings or risk codes provided in this report are provided tor illustrative purposes ony,and are not in[ended to provide,nor should they be ir ,1 as providing any(acts regarding,or prediction or forecast of,any environmental risk Tor any property. Any liability on the paA of EDR is stricty limited to a relund o1 the amount p �is repoA. Copyrighl 2004 by Environmental Data Resources,Inc. All rights reserved. Reprodud'an in any media or format,in whole or in part,ot any report or map o(Environmental Dala Resources, Inc.w its aHiliates,is prohibited without prior written permission. EDR and its logos(induding Sanbwn a�d Sanborn Map)are trademarks of Environmenlal Data Resources,Inc.or its affiliates. All other trademarks used herein are the property of their respective owners. . . _ ,� EDR'� Environmental Data Resources Inc The EDR-City Directory Abstract The Standard In Environmental Risk Management Information Petrovista Development Phase l 11805 SE Petrovitsky Rd. Renton, WA 98058 440 Wheelers Farms Road Milford, Connecticut 06460 ,��g�sc o�, 2ooa Nationwide Customer Service Inyuiry Number: 1241001-4 Telephone: 1-800-352-0050 Fax: 1-800-231-6802 . . Environmental Data Resources, lnc. " � City Directory Abstract Environmenial Data Resources. Inc.'s (EDR) City Directory Abstract is a screening tool designed to assist professionals in evaluating potential liabiliry on a target property resulting from past activities.ASTVI E 1527-00, Section 73 on 1 listorical Use information identifies the prior use require�nents for a I'hase 1 en��ronmental site asses�nent The AS7T-1 standard requires a revie�v of rc�rzconahh•arcerlai�utble sta�ulm•d historic�al sotu�c�s.Reruoiuibh�asce�tainuble means injormation thal is publicly avc�ilable, nh�ntnnhle Jr�om a soi�r�•e x�itlt reasnrrahlc� time and rnsl coi�slrain�s, artd praclically reviewab/f�. To meet the prior use reyuirernents uf AS'11�1 E 1�27-00, Section 7.3.4, the follo��ing standard historical source.c may be used:aerial photographs,fire insurance maps,property tax files,land tide records(althoubh these cannot be the sole historical source consulted),topographic maps,city directories,building department records,or zoning/land use records. ASTM E 1527-00 requires'i111 ohrio:rs uses o�the property shal!he identifred Jrona the present, back to the properry'.e obti�ous frrs7 de�eloped tese,or hnck to 1940,x hiche�+er is earlier.71ris task requires re��iewing onh•as nutny oj�he slanda�-d histoncal scnu-ces as crre necessa�y,u�ul lhal mr reasaiably accerluinable and lrkely to be useful."(AS71�7 E 1527-00,Section 7.3-2,page 12.) EDR's City Directory Abstract includes a search and abstract of avaitable city directory data. City Directories City directories have been published for cities and towros across the U.S.since the 1700s.Originally a list of residents,the city directory developed into a sophisticated tool for locating individuals and businesses in a particular urban or suburban area.Twentieth century directories are generally divided into three sections:a business index,a list of resident names and addresses,and a street index.With each address,the directory lists the name of the resident or,if a business is operated from this address, the name and t�-pe of business (if unclear from the name). While city directory coverage is comprehensive for major cities,it may be spotty for rural areas and small to�vns.ASTh9 E 1527-00 specifies that a "review of cit}'directories(standard hislorical sources)at less than appro.rima�ely fire year intervals is not required by this practice."(ASTM E 1527-�0, Section 7.3.2.1,page 12.) � NAICS(North American Industry Classification System)Codes NAICS is a unique, all-new system for classifying business establishments. Adopted in 1997 to replace the q prior Standard Industry Classification (SIC) system, it is the system used by the statistical , __ agencies of the United States. It is the first economic classification system to be constructed based on a single economic concept. To learn more about the background, the development and difference between NAICS and SIC, visit the following Census website: http://w�vw.census.gov/epcdhvww/naicsdev.htm. 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It can not be concluded from this repon that co��erage information for the target and surrounding properties dces not exist from other sources.Any analvses,estimates,ratings or risk codes proeided in this report are pro�ided for illustrative purposes only,and are nol inlended to procide,nor should they Fie interpreted as providing any facts regarding,or preJiction or forecast of,any environmental risk for any property. Any liabilit}•on the part of EDR is slrictly limited to a refund of the amount paid for this report. Copyrigh[2004 by Fnvironmental Data Resources,lnc. All rights reserved. Reproduction in any media or fortnat,in whole or in part, vf any report or map of Iim�ironmental Data Resources,Inc.or its affiliates,is prohibited�vithout prior�vritten permission. fiDR and its logos(including Sanbom and Sanborn�9apj are trademarks of Em•ironmental Data Resources,Inc.or its affiliates. All other trademarks used herein are the property of their respecti�•e owners. . s 4. SUNINIARY � • Crty Directories: l3usiness directories including city,cross reference and telephone directories were reviewed, if available,at approximately five year intervals for the years spanning 1964 through 1996. (These years are not necessarily inclusive.) A summary of the information obtained is provided in the text of this repori. ;� ) 1241001-4 1 PUR ID Year Uses NAICS Source 1977(continucd) Vacant(11804) N!A Rcsidcncc(11812) Rcsidcncc�11925) -Vo olhcr addresscs within rangc *'l I8T11 AV'E SF,'* Address not lis�cd in rescarch source(17521) N/A Address nd Iistcd in rescarch sourcc(17619) N!A 1982 '�SE PETROVITSKI'RD" Polk Ciry Dircctory Rcsidcncc(117051 , Rcsidcncc(It707) Rcsidrncc(11725) Rcsidrncc(I 1804) Rcsidcncc(11812) Rcsidcncc(II925) -No olhcr addresscs wilhin rangc "•1/8TH AVE SE•' Addrcss not lislcd in rescarcb sourcc(17521) AUA I Address not listcd in rescarch sourcc(i76I9) N/A ' I98% •*SE PETROVI"f SKl'RD*• � Polk City Dircctory Rcsidcncc(11705) Hcsidcncc(1t707) . I)iescl Parts&Scrvicc(I 1725) Kcsidrncc(ll925) -No olhcr addresscs within rangc '*I ISTII AFE SE•• A pt s(17521) Address nol lislcd in rescarch source(17619) N/A 19�r •'SE PE'I'RO�'ITSKY'RD'• Rcsidcncc(1I705) Polk City Dircctory Ncsidrncc(11707) Kcsidcncc�11725) Vo o�hcr addrascs within rangc "I 18TH AVE SE'• �1 p�s(1752 I) ,Ap�s(I?619) 1241001-4 3 e � � i I APPENDIX C TAX ASSESSOR'S RECORDS � i King County: Assessor Property �'haracteristics Report I'age 1 01�2 ., , , a ._ � KI11� COUEtty �• - � � • - � By law this information may not be used for commercial purposes. Assessor Real Property Records: _ . :,_...__ .__ ._. .._ . _ ._. _ __. , ._ �....._.,. _ __ VANDERSCHELDEN Parcel Number 6196600380 Taxpayer DALE � Account Number 619660038008 � __._,. Tax Year 2005 Levy Code 4250 Tax Status TAXABLE Taxable Value Reason NONE OR UNKNOWN Appraised Land Value $131,000 Taxable Land Value $131,000 Appraised Improvement $g0,000 Taxable Improvement Value $80,000 Value VANDERSCHELDEN Parcel Number 6196600380 Taxpayer DALE � Account Number 619660038008 Tax Year 2004 Levy Code 4250 Tax Status TAXABLE Taxable Value Reason NONE OR UNKNOWN Appraised Land Value a131,000 Taxable Land Value $131,000 Appraised Improvement $g0,000 Taxable Improvement Value $80,000 Value t Assessor Property Sales Records: Tip: Use the Recorders Off_ice; Excise Tax Affidayits Report to see more sales records details Sale Date 2/5/1993 Sale Price $150,000 Seller Name GILL ROY G+KATHERINE M Buyer Name VANDERSCHELDEN DALE L+ Assessor Parcel Records: District Name KING COUNTY Property Name TYpee�Y RESIDENTIAL Plat Name NORTHWESTERN GARDEN Present Mobile Home TRACTS DIV NO. 01 Use Plat Block 2 Water WATER System DISTRICT Plat Lot �_2 Sewer pRIVATE System Lot Area 98,010 SqFt(2.25 acres) Access PUBLIC Section/Township/Range NW 33 23 5 Street pAVED Surface http://www5.metrokc.�ov/ren�rts/nrnnPrtv rPnnrt a�n`��=��qF.�.nn:un a�i�r�nn:� King County: Assessor Nroperty Characteristics Report Na�e 2 01�2 f � " '� f. .� Assessor Legai Description Records: Account Number 619660038107 Record 01 Number Legal Description 1-2 2NORTHWESTERN GARDEN TRS DIV# 1W 250 FT This report was generated:8/17/20Q4 8:3429 AM Related on-line re orts: DDES_Permit_Applications_R_eport King County: Districts and Development Conditions Report King County Assessor: eReal.Property Report(PDF format requires_Acrobat) King County Treasury Operations: Property Tax Information Recorders Office:_Excise Tax Affidavits Report Recorders Off_ice:_Sc_anned images of plats�_surveys; and other m_ap documents Enter a 10 digit Parcel Number: or Enter an address: Search I King Cou_n_ty � GIS Center � News � Se�ices � _C_omments � Search By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. The details. / llttp:/I��v�5.tnetr��kc.��c�v/reports/nronertv renort.asn?PIN=fi196f,��Rl R�`17I�(l�d �:._ 7.0 OTHER PERl��ITS 7.l Postmaster/Mailbox Location Approval � 7.2 Water and Sewer Availability Certificates ' � 11011.004.doc[DED/dm) 7.1 Postmaster / Mailbox Location Approval , ROAD AND STORM DRAINAGE PLAN � � SECl10N 35,TOWWSI-pP 23 NORTH,RIWGE 5 EAST,�M�IIDIAN �w �u KWG COUNTY�STATE OF WASHNGTON � _ � �.�.� Q t��Bn IE.J99.:N 4�"� Q �?��'• � . � �� ) CB ai]5 ' rB 11J7 lY OP E[��IOI,IIH i��,` � ''�•✓/ o�.;- � o �s ao eo ,� r.-'z; r�.�.w ,-.e�-� iw=a}.c+ n.,..:..ix p � s` W _;:.��''' .� � �s'avse..o�.ie . - � � � r��. 12'OP 5 IENN.02 I�� VFA7IGLL J6'fYP- Q I � ,•i" I . SVJMC W1FR TOP=J35!] "z (� .7C'bK M IE�39J.77 Q •.. 1 I � ;, ' ��,, CB�15o II (1E1.f/ll Q . 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Ussu[o) ' 1 --- ^3��n �i '.o,�.•'''� I I �� '_ '_ _- 30 -'�� N N � 1 -DC .V\ ��1(f � �� m Yvv �G ' b W I W�($ ��yAM[5 9.N/'70 10.30' I ��M I �E�,� t ' ,� r �ru+�eto��xttis -0 s �.o m au siacur oc.wwvu 1f , TYPICAL DITCH SECTION WITHOUT BERM �ul �'av�. � I 21 WX 9DVE � SDEM'ALR 6� AS$IqWH d/PlN1 � I M01 TO SCAIE ��V O�. . , :• �I 2• F_�� J � � � ----I I I I p�y . � 2% 2x .01 R./17. .0.1 R./F�. YI�flES � ' $� Q��_ q:� ! y NING COUf(1Y D.D.ES. _ . I-- ��`•_.S�'-� ��- � r�,��,�r� �� , s-�curirt wrKr�rre secwwc �-�n-��2 K��- r��T�� b ' �0� Prx Kcrts owc.no.a-aoi S�'cawNc�cn ocrm�Te caaraucr.•cc�cwr cwcanc �°'^"�' � ��^P�^ � 8 �co 5'C01V1CIED OEPfN CRU9IED IdOCN SURFMl�G&l5E CqAtSE 1-1/1'CO4VACIm OFPM CA1614D ROpc AIK�O�C WF COUPS[ �YEIR CONCRlIF RIX1FD QNB Cd6TMIC7 CEYEM OONCRflE CUPB t pR1ER �ft sti5c awSS'e'wr eE REq1�Ku o[YcioMc a�s0a ea�dlqe6 s'cap�nm o[vm eemm noac snriaw eASE canst PER KCAS DWG.ND.J-p12 IiOv{�r E�qinNf COTQhCOf� Oct� (SEE SECf10N5�A2 f a.0.S KC.RS.) tllklEl 8lY CUSS b'wY BE NFOURED OEAIpIG 011 90L MIDIt10l6 � S.E.176TH CT c��•�!..�RCA�) � � KING COUIJTY I�iBAN SUBACCES3 t18TH AVE.SE(1/2 STREET MiPROVEAAENTS) �ovwExr�'Q+an�v.e. "�'°"°' °°'� � � "°"°� KWG COUN'TY URBAN NEIGHBOF�-IOOD COLLECTOR comm«�es: � Nor ro sc�e � 7.2 Water and Sewer Availability Certificates � � �� S.0 ESC ANALYSIS AND DESIGN The limits of clearing have been shown on the construction plans to encompass the entire site area with the exception of the sensitive areas and their buffers. Bright orange sitt fences have been proposed along the north property Iine and along the proposed Sensitive Area Tract lines. Temporary V-ditches have been proposed along the proposed road alignment to convey sediment-laden water to the proposed sediment trap. This temporary sediment trap will help to remove the sediment from the stormwater prior to being discharged into Tract B. The north portion of this site will sheetflow through the proposed silt fence prior to being discharged into the Sensitive Area Tract. A temporary construction entrance will also be installed off of 118th Avenue S.E. This temporary construction entrance will help retain sediment on site. f � I� I I il ! I � ; ]1011.00�.doc[DEDldm] 9.0 BOND UANTITIES FACILITY SUMMARIES AND DECLARATION OF 'I Q � � COVENANT Enclosed within this section is the facility summaries sheet and sketch. Bond quantity ��orksheets«ill be completed at the initial revie�� by King Count}�. I 1011.004.doc(DED;dmJ - KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL �I STORMWATER FACILITY SUMMARY SHEET Development Petro Vista Plat Date T I/3/04 I Location SEC of 118`�'Ave SE and SE PetroviskY Rd II ENGINEER DEVELOPER I Name Hal P. Grubb,P.E. Name Bob Ehrlichman Firm Barghausen Consulting Engineers,Inc. Firm Bennett Sherman LLC i Address 18215 72nd Avenue South Address 2100 124`�Ave NE Suite 100 ' Kent,WA 98032 Bellewe, WA 98005 � Phone (425)251-6222 Phone (425)709-6508 Developed Site: Acres 3_8 Number of lots 18 Number of detention facilities on site: Number of infiltration facilities on site: ponds ponds 1 vaults vaults tanks tanks Flow control provided in regional facility(give location) N/A , No flow control required N/A Exemption number N/A Downstream Draina e Basins TmmP�iiate Mainr Ra�in Rasin A (;reen River , ;, Rasin R Rasin C� Ra¢in 17 I Number&type of water quality facilities on site: biofiltration swale regular/wedor sand filter(basic or large?) continuous inflow?) sand filter,linear(basic or arge?) combined detention/WQ pond 1 basic sand filter vault(basic or lazge?) ' (WQ portion basic or large?) 1 combined detention/wet vault stormwater wetland 1 compost filter wetpond(basic or large?) filter strip wetvault flow dispersion farm management plan landscape management plan oiUwater separator(baffle or coalescing plate?) catch basin inserts: Manufacturer pre-settling pond pre-settling structure; Manufacturer flow-splitter catchbasin DESIGN INFORMATION INDIVIDUAL BASIN A B C D Water Oualitv desien flow .043 Water Oualitv treated volume or wetoond V. 7.600 1998 Surface Water Design�tanual 9��98 1 1 1011 SUMMARY SHEET.doc KING COUNTY,WASHINGTON,SURFACE WATER DESIGN MANUAL � DESIGN TOTAL INDIVIDUAL BASIN INFORMATION,cont'd Drainaee basinlsl A B C D Offsite area 0 Tvne of Storaee Facilitv vault Live Storaee Volume 22_680 Predeveloned Runoff Rate 2-vear .043 10-vear .061 100-vear .118 Develoned RunoffRate 2-vear .043 10-vear .062 ]00-vear .715 Tv�e of restrictor Orifice Size of the orificelrestrictor No. 1 ]" No.2 0.5" No.3 No.4 FLOW CONTROL&WATER QUALITY FACILITY SUMMARY SHEET SKETCH All detention,infiltration and water quality facilities must include a sketch per the following criteria: ` �� 1. Heading for the drawings should be located at the top of the sketch(top right-hand comer). ' The heading should contain: • Nonh arrow(point up or to left) • D9# • Plat name or short plat number • Address(neazest) • Date drawn(or updated) • Thomas Brothers page,grid number 2. Label CBs and MHs with the plan and profile designation. Label the control structure in writing or abbreviate with C.S. Indicate which structures provide spi[1 control. 3. Pipes--indicate: Pipe size I Pipe length Flo�v direction Use a single heaw weight line 4. tanks--use a double,heavy weight line and indicate size(diameter) 5. Access roads • Outline the limits of the road • Fill the outline�vith dots if the road is gravel. Label in writing if another surface. 6. Other Standard Svmbols: • Bollards ! ! ! !++++ • Riprap ###### ###### Fences --Y--x--x--x--x--x-- • Ditches �D��D��—>D 7. Label trash tracks in�vriting 8. :Label all streets with the actual street sign designation. lf you don't know the actual sVeet name,consult the pla[map. 9. Include easements and lot lines or tract limits when possible. 10. Arrange all the labeling or writing to read from left to right or from bottom to top with reference to a properly oriented heading. I 1. lndicate driveways or features that may impact access,maintenance or replacement. 1998 Surface VVater Design Manual 9/1/98 2 11011 SUMMARY SHEET.doc Site Improvement Bor .�. Quantity Worksheet King County Department of Development&Environmental Services 800 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Project Name: PETRO VISTA Date: 2/4/2005 �ocation: SOUTHEAST CORNER OF SE 176TH AND 118TH AVE SE Project No.: L02P0012 I Activity No.: L04SR074 Note: All prices include labor, equipment, materials, overhead and Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seattle area or from local sources if not included in the RS Means database. x yes no If yes, Forest Practice Permit Number. ' (RCW 76.09) Page 1 of 9 � .S�Y. GR ti ��OF WAsy�� O Z '�,p 75 � �� /STE��G\�� S/ONAI.'� L '•,� ox m m E IRES: 6 /10 / d �_� W n cn ;O � m A Z �� " : � �. .� � < , Unit prices updated: 02/12/02 Version: 04/22/02 kc-bqw-2-4-05.x1s Report Date: 2/9/2005 Site Improvement Bor,.� Quantity Worksheet ; > ;:.;: t}n ii<: ,;:.::::.. <' #of : 'i ;; ' ;' Fiefarnr�� : l�rt�e Unit Ctuantit A iir,�t�on� Gost _ _ _ __ ..._ ....__.._ _..... .................. ..... . . ..._. _ _ _ _ _ _ _ _ _ _ _ �ROSt4NISEDIMENT C{3NTR01� i> , ` , _.... . _ Backfill & com action-embankment $ 5.62 CY 200 1 1124 Check dams, 4" minus rock SWDM 5.4.6.3 $ 67.51 Each 15 1 1013 Crushed surfacin 1 1/4"minus WSDOT 9-03.9 3 $ 85.45 CY Ditchin $ 8.08 CY 56 1 452 Excavation-bulk $ 1.50 CY Fence, silt SWDM 5.4.3.1 $ 1.38 LF 1258 1 1736 Fence,Tem ora NGPE $ 1.38 LF H droseedin SWDM 5.4.2.4 $ 0.59 SY 7686 1 4535 Jute Mesh SWDM 5.4.2.2 $ 1.45 SY Mulch, b hand, straw,3"dee SWDM 5.42.1 $ 2.01 SY Mulch, b machine, straw,2"dee SWDM 5.4.2.1 $ 0.53 SY 7686 1 4074 Pi in ,tem ora ,CPP, 6" $ 10.70 LF Pi in ,tem ora ,CPP, 8" $ 16.10 LF Pi in ,tem ora , CPP, 12" $ 20J0 LF Plastic coverin , 6mm thick,sandba ed SWDM 5.4.2.3 $ 2.30 SY Ri Ra , machine laced; slo es WSDOT 9-13.1 2 $ 39.08 CY Rock Construction Entrance, 50'x15'x1' SWDM 5.4.4.1 $ 1,464.34 Each Rock Construction Entrance, 100'x15'x1' SWDM 5.4.4.1 $ 2,928.68 Each 1 1 2929 Sediment ond riserassembl SWDM 5.4.5.2 $ 1,949.38 Each Sediment tra , 5' hi h berm SWDM 5.4.5.1 $ 17.91 LF Sed.tra ,5'hi h,riprapped spillwa berm section SWDM 5.4.5.1 $ 68.54 LF 50 1 3427 Seedin , b hand SWDM 5.42.4 $ 0.51 SY Soddin , 1"dee , level round SWDM 5.4.2.5 $ 6.03 SY Soddin , 1"dee ,slo ed round SWDM 5.4.2.5 $ 7.45 SY TESC Su ervisor $ 74.75 HR 24 1 1794 Water truck, dust control SWDM 5.4.7 $ 97.75 HR 12 1 1173 ,. . :::::::.:...::::....>:::::;:;:<:::::>:C 6.i:.>;;::;:;.;:;:E I::<I<rE'rE<: .....:.::::.:::: ,�+�it* ......,...,:...:.:.:::: ,. .:.:::...; ;: ��. _. SE9@, $ ;.�;:>::::;.:;::>::;._:::>:>:>:>:::::::;:;:e•:<::;<:: ..:..:::::::::: __ _. Each ESC SUBTOTAL: $ 22,256.17 30%CONTINGENCY & MOBILIZATION: $ 6,676.85 ESC TOTAL: $ 28,933.02 COLUMN: A Page 2 of 9 Unit prices updated: 02/12/02 Version: 04/22/02 kc-bqw-2-4-05.x1s Report Date: 2/9/2005 Site Improvement Bor�' t�uantity Worksheet , .... ;: ' ' ` Eklsttn Fnture Public ': Fsivate Duantity Cotnplsi�d r< , ; on�., .: ;::.fil�ht!QY Yvdy : �t6ad tmprovemenis 111ipto�tements ��o < , <::: ;::..... nd Reducti ' ' ' `; ' >:: ' &Oraina e:Eaeilities : Qc�nt. ' >: ' ;:,` Unit�'nc� : tlnii 4ua�`Ef, ` Ct�st I Quant" : Ct�st " _:'Q�ant,.'. Cast Cc3m�1r�te Cc�r�t Backfill&Com action-embankment $ 5.62 CY 100 562.00 1303 7,322.86 7819 43,942.78 Backfill&Com action-trench $ 8.53 CY Clear/Remove Brush,b hand $ 0.36 SY 0.01 0.00 Clearin Grubbin ree Removal $ 8,876.16 Acre 0.07 621.33 0.5 4,438.08 1.75 15,533.28 F�ccavation-bulk $ 1.50 CY 3 4.50 888 1,332.00 3239 4,858.50 ��i Excavation-Trench $ 4.06 CY Fencin ,cedar,6'hi h $ 18.55 LF Fencin chain link vin I coated, 6'hi h $ 13.44 LF 439 5,900.16 Fencin ,chain link, ate,vin I coated, 20' $ 1,271.81 Each Fencin ,s lit rail,3'hi h $ 12.12 LF 501 6,072.12 Fill&com act-common barrow $ 22.57 CY Fill&com act- ravel base $ 25.48 CY Fill&com act-screened to soil $ 37.85 CY Gabion, 12"dee ,stone filled mesh $ 54.31 SY Gabion, 18'dee ,stone filled mesh $ 74.85 SY Gabion,36"dee ,stone filled mesh $ 132.48 SY Gradin ,fine,b hand $ 2.02 SY Gradin ,fine with rader $ 0.95 SY 279 265.05 1512 1,436.40 Monuments,3'lon $ 135.13 Each 1 135.13 6 810.78 Sensitive Areas Si n $ 2.88 Each 15 43.20 Soddin 1'dee ,slo ed round $ 7.46 SY Surve in ,line& rade $ 788.26 Da 0.5 394.13 1 788.26 ', Surve in ,lotlocation/lines $ 1,556.64 Acre 1.5 2,334.96 � Traffic control crew 2 fla ers $ 85.18 HR 24 2,044.32 Trail,4"chi ed wood $ 7.59 SY Trail,4"crushed cinder $ 8.33 SY Trail,4"to course $ 8.19 SY Wall, retainin ,concrete $ 44.16 SF Wall, rocke $ 9.49 SF 373 3,539.77 1131 10,733.19 Page 3 of 9 SUBTOTAL 7,566.23 21,260.96 84,285.61 Unit prices updated: 02/12/02 `KCC 27A authorizes only one bond reduction. Version: M22/02 kc-bqw-2-4-05.x1s Report Date: 2/9/2005 Site Improvement Bor�' t�uantity Worksheet � ; < < Exist�ng Fu€ure:PubUc Priv�t� �3ond Red�ict�on�' Right-ut-�vay ; Aaad iritprAv�m�n�s Impravem��ts &Draina e�aciliUes . fauan�. ` ;:: _ ::.: llriiE Pr�ee .::: E,�it Quant. ''. Coo-�1 ' {��anE,' �ast :_ :Q�aant.::: C�st �oFn ete :I �st _...... ..__ _ _ _ __ __.. .... ............ .._............. ..... ........._,. _....... . ....... _ _._.. _ _.._. . ...._.. __.... ___ ___ _ __ ..........._.......... . . . .................__.._..._........._........._.... _..... __ _ _ _ AC Grindin ,4'wide machine<1000s $ 23.00 SY AC Grindin ,4'wide machine 1000-2000 $ 5.75 SY AC Grindin 4'wide machine>2000 $ 1.38 SY AC RemovaUDi osaVRe air $ 41.14 SY Barricade, e I $ 30.03 LF Barricade, e III Permanent $ 45.05 LF Curb&Gutter,rolled $ 13.27 LF 671 8,904.17 Curb&Gutter,vertica) $ 9.69 LF 234 2,267.46 248 2,403.12 Curb and Gutter,demolition and dis osal $ 13.58 LF Curb,extruded as halt $ 2.44 LF Curb extruded concrete $ 2.56 LF Sawcut,as halt,3"de th $ 1.85 LF 280 518.00 Sawcut concrete er 1"de th $ 1.69 LF Sealant,as halt $ 0.99 LF Shoulder AC see AC road unit rice $ - SY Shoulder, ravel,4"thick $ 7.53 SY 9 67.77 Sidewalk,4"thick $ 30.52 SY 151 4,608.52 79 2,411.08 Sidewalk 4"thick,demolition and dis osal $ 27.73 SY 1 27.73 Sidewalk,5"thick $ 34.94 SY 278 9,713.32 Sidewalk, 5"thick,demolition and dis osal $ 34.65 SY Si n,handica $ 85.28 Each Stri in , er stall $ 5.82 Each Stri in thermo lastic, for crosswalk $ 2.38 SF Stri in ,4"reflectorized line $ 0.25 LF Page 4 of 9 SUBTOTAL 7,489.48 23,431.69 Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Vefslon: M22/02 kc-bqw-2-4-05.x1s Report Date:2/9/2005 Site Improvement Bor�' �uantity Worksheet _` <,: ;: ` ;; ,,. " ` �xisting ' �ulttre::pub3�¢ ..: _ Private Bot1d Redu�#fAtt* Right-of•way Aoad lmpriiyetnents Improvements _ , _ ' E�C3reina e�'awlities.. : 'Q�ant ; UrlitPnCB _Unii Quanf- Cogt ;Quattt, 'r f;0&I : ' _�uant C�si Gom�l�+ie �p&t ;: .; _ : , _::. ;. _, _ ;. K ' 1 ': .. ' > :<..�:::E�t+.c�c...�>��tas�&<:i.;�'r.>;... .:�au.r.sa�::;::;�ar 5t�t��f��E.e 5; �nc�c-i5 ba�s�..t.r�R C��s�t�ur�al; : For KCRS'93, additional 2.5'base add: $ 3.60 SY AC Overla , 1.5"AC $ 7.39 SY 685 5 062.15 AC Overla ,2'AC $ 8.75 SY AC Road,2',4'rock, First 2500 SY $ 17.24 SY 279 4,809.96 AC Road 2" 4"rock,Q .over 2500SY $ 13.36 SY AC Road,3',4'rock, First 2500 SY $ 19.69 SY 1512 29,771.28 AC Road 3" 4"rock Q .over 2500 SY $ 15.81 SY AC Road 5" First 2500 SY $ 14.57 SY AC Road,5",Q .Over 2500 SY $ 13.94 SY AC Road 6',First 2500 SY $ 16.76 SY AC Road 6' Q .Over 2500 SY $ 16.12 SY As halt Treated Base,4`thick $ 9.21 SY Gravel Road,4'rock, First 2500 SY $ 11.41 SY Gravel Road 4"rock,Q .over 2500 SY $ 7.53 SY PCC Road,5", no base,over 2500 SY $ 21.51 SY PCC Road, 6",no base,over 2500 SY $ 21.87 SY Thickened Ed e $ 6.89 LF Page 5 of 9 SUBTOTAL 9,872.11 29,77128 Unit prices updated: 02/1?J02 'KCC 27A authorizes only one bond reducGon. Version: M22/02 ko-bqw-2-4-05.x1s Report Date: 2/9/2005 Site Improvement Bor�' �uantity Worksheet ;: ,;:; .. .:,;; ,:;;; ;;;; . Existing ; F'uture Pubiic Private Bond Reduction� . ,. ; ': ' Rfgh�oi-way ; RQad t�provemen3s Improvsmsnts ; '; E�.[�raina eFacilities �u.int --- ; . '; :: Unif Pdce� ' Unii<._ Qt�3nt: �s�::i �vant; Cost :Quant. ' '::GQ:st C��m �1�.te Ga3t. , ;, :::: ,:..; - ,, ;: <:.:..< ;:::, _ f�#:?�, ..:.. i�4t�'1�sEi�l?i 8 F�E'�.�Qt�. Yslett ...... ::.....:.;,,.::. ,:. ,,, . :; .��'� �e - ;: > <> ; , ,: > ; �`•�.......................P � ...............�..........�.............: ;:::��:::.�.�s��t�lfteaE �., ; as[►#4'covecwas assuRi�d:'�ssusna> . [aled YVC is:same aae as sWid e. Access Road,R/D $ 16.74 SY 130 2 176.20 Bollards-fixed $ 240.74 Each 2 481.48 Bollards-removable $ 452.34 Each 2 904.68 ' CBs include frame and lid CB T e I $ 1 257.64 Each 3 3,772.92 6 7,545.84 CBT eIL $ 1,433.59 Each CB T e II,48'diameter $ 2 033.57 Each 3 6,100.71 for additional de th over 4' $ 436.52 FT CB T e II 54'diameter $ 2,192.54 Each for additional de th over 4' $ 486.53 FT CB T e II,60'diameter $ 2 351.52 Each for additional de th over 4' $ 536.54 FT CB T e II,72"diameter $ 3 212.64 Each for additional de th over 4' $ 692.21 FT Throu h-curb Inlet Framework Add $ 366.09 Each Cleanout, PVC,4" $ 130.55 Each Cleanout, PVC 6" $ 174.90 Each 3 524.70 1 174.90 4 699.60 Cleanout, PVC,8' $ 224.19 Each Culvert PVC,4' $ 8.64 LF Culvert,PVC,6' $ 12.60 LF Culvert,PVC 8" $ 13.33 LF Culvert,PVC, 12' $ 21.77 LF 229 4,985.33 399 8,686.23 Culvert,CMP,8" $ 17.25 LF 27 465.75 Culvert CMP 12" $ 26.45 LF 58 1,534.10 Culvert,CMP, 15" $ 32.73 LF Culvert,CMP, 18" $ 37.74 LF Culvert CMP,24' $ 53.33 LF Culvert,CMP,30" $ 71.45 LF Culvert,CMP, 36" $ 112.11 LF Culvert CMP,48" $ 140.83 LF CulveR,CMP,60" $ 235.45 LF Culvert,CMP,72" $ 302.58 LF Page 6 of 9 SUBTOTAL 10,817.05 26,535.79 699.60 Unit prices updated: 02/12/02 "KCC 27A authorizes only one bond reduction. Vefslon: M22/02 kc-bqw-2-4-05.x1s Report Date:2/9/2005 Site Improvement Bor�' �uantity Worksheet ` >: Existing ' >; Future F?ublic Private �ontl Reduction' ` `' ` _ Rfght ai-v�a� ' RAad lmproveme�#.s Iniprovemer�ts >. 1�flAlN#4t��ON'�'�Nll��3 &1Drainaye�aciliUQs C�ua�itv. . . - Ut'tiE Prite Unil' Quarit. Cobz: ' �uanf ' Cast f�uant. CQ�# C<am�ieie �ast Culvert,Concrete,8" � $ 21.02 LF Culvert,Concrete, 12" $ 30.05 LF Culvert,Concrete, 15" $ 37.34 LF Culvert,Concrete, 18" $ 44.51 LF Culvert,Concrete,24" $ 61.07 LF Culvert,Concrete 30" $ 104.18 LF Culvert,Concrete,36" $ 137.63 LF Culvert Concrete,42" $ 158.42 LF Culvert,Concrete 48" $ 175.94 LF Culvert,CPP 6" $ 10.70 LF Culvert,CPP,8" $ 16.10 LF Culvert,CPP, 12" $ 20.7o LF Culvert,CPP, 15" $ 23.00 LF Culvert,CPP, 18" $ 27.60 LF Culvert CPP,24" $ 36.80 LF Culvert,CPP,30" $ 48.30 LF Culvert,CPP,36" $ 55.20 LF Ditchin $ 8.08 CY 106 856.48 508 4104.64 Flow Dis ersal Trench 1 436 base+ $ 25.99 LF French Drain 3'de th $ 22.60 LF Geotextile,laid in trench, ol ro lene $ 2.40 SY Infiltration ond testin $ 74.75 HR Mid-tank Access Riser 48"dia, 6'dee $ 1,605.40 Each Pond Overflow S illwa $ 14.01 SY RestrictodOil Se arator, 12" $ 1 045.19 Each RestrictodOilSe arator, 15" $ 1,095.56 Each Restrictor/Oil Se arator, 18" $ 1,146.16 Each Ri ra laced $ 39.08 CY 10 390.8 Tank End Reducer 36"diameter $ 1,000.50 Each Trash Rack, 12" $ 211.97 Each 1 211.97 Trash Rack 15" $ 237.27 Each Trash Rack, 18" $ 268.89 Each Trash Rack,21" $ 306.84 Each ' Page 7 of 9 SUBTOTAL 1068.45 4495.44 Unit prices updated: 02/12/02 *KCC 27A authorizes only one bond reduction. Vel'sion: 4/22/02 kc-bqw-2-4-05.x1s Report Date: 2/9/2005 Site Improvement Bor�' �uantity Worksheet ' '. ' < ; :::Existing Future Publi� `` ` Private Bond�ted�rction�` = ' _ > . . _ ' Rfght-af-way RoAd improuements lmprovsmsnts ;...:': i _ &Draina �Facilities Qt�ant. _:,:: '' < (.3ml:T�rioe Unii QudRt: PrieE: �uunL _ Cust f3t�antc.:::; ' 'Co�t :'' �dtn ate ;>...... ..,east . ..::._;: 2'AC 2"to course rock&4'borrow $ 15.84 SY 2'AC, 1.5" to course& 2.5`base course $ 17.24 SY 4'select borrow $ 4.55 SY I 1.5'to course rock&2.5`base course $ 11.41 SY I ;. .:.:.::::::::::..::::...:..:..... .... ' ;....:. ..........:.....:...::.:..:..:..•.>:;:::;:;�::::::..,.::.;�•;<::;::•;:.;;::.;;;;::... ., . ...... S�R �r ��,t� ;:.::;•,>;••>:;:<::...:;:::;.;..:.......:. .... .. . ......,... .. ..... .............. .. . .. . r: .�,i .;:..:;:;<,::;;;:a::::.<:«<:<;.>r;::::.::::::::<::::>::>::>r:::::::»<:<:i::::::»:r:::::::>::r:::rrr:::•:::::::r::rrrr�>::>::>:::::::..:.:.,r.:._:...:;::::�:� . ,.,............. :.:::::::<�s;:;;:::<:>:><E..:;s";.>;::;s..;:.. . �. �t.l�.�:,IJ.'q'.'�Gfl7.'�'j..:.:::.:::....::.....::::::...........::.:...::::.:.:..:. ...:::..:.�.::...::.:::.::.:.:.:..:.::.�:::::..:.::....:..:�..:.: , . , ..;:::»>:o�::.:::.?�:;<sr,:.:;:�sr.::.:�s::5::::::::;:r. •� . ............ ............................... ........... ........... , ', Detentlon/water uali vault $ 3.50 CF. 23200 81,200.00 Sand filter $ 4.00 CF. 8509 34 036.00 I Com ost Filter $ 15,000.00 EA. 1 15 000.00 EA. EA. EA. LF SF LF LF SUBTOTAL 130,236.00 SUBTOTAL(SUM ALL PAGES): 36,813.32 231,235.72 89,480.65 30%CONTINGENCY&MOBILIZATION: 11,044.00 69,370.72 26,844.20 G RAN DTOTAL: 47,857.32 300,606.44 116,324.85 COLUMN: B C D E Page 8 of 9 Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Ve�slon: M22/02 � kcbqw-2-4-05.x1s Report Date 2/9/2005 Site Improvement Bo� .,� Quantity Worksheet Original bond computations prepared by: Name: HAL P. GRUBB Date: 2/4/2005 PE Registration Number: 23975 Tei.#: (425)251-6222 Firm Name: BARGHAUSEN CONSULTING ENGINEERS INC. Address: 18215 72ND AVE. SOUTH KENT, WA 98032 Project No: L02P0012 ROAD IMPROVEMENTS&DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS PERFORMANCE BOND' PUBLIC ROAD&DRAINAGE AMOUNT BOND'AMOUNT MAINTENANCE/DEFECT BOND' REQUIRED AT RECORDING OR Stabilization/Erosion Sediment Control (ESC) (A) $ 28,933.0 TEMPORARY OCCUPANCY**` Existing Right-of-Way Improvements (B) $ 47,857.3 Future Public Road Improvements&Drainage Facilities (C) $ 300,606.4 Private Improvements (D) $ 116,324.8 Calculated Quantity Completed (E) $ - Total Right-of Way and/or Site Restoration Bond*/"" (A+B) $ 76,790.3 (First$7,500 of bond*shall be cash.) Performance Bond"Amount (A+B+C+D) = TOTAL (T) $ 493,721.6 T x 0.30 $ 148,116.5 OR irnmum on amount is 1 00. Reduced Performance Bond*Total**' (T-E) $ 493,721.6 Use larger o x o or - (B+C)x Maintenance/Defect Bond'Total 0.25= $ 87,115.9 NAME OF PERSON PREPARING BOND'REDUCTION: Date: *NOTE: The word"bond"as used in this document means any financial guarantee acceptable to King County. "NOTE: KCC 27A authorizes right of way and site restoration bonds to be combined when both are required. The restoration requirement shall include the total cost for all TESC as a minimum,not a maximum. In addition,corrective work,both on-and off-site needs to be included. Quantities shall reflect worse case scenarios not just minimum requirements. For example,if a salmonid stream may be damaged,some estimated costs for restoration needs to be reflected in this amount. The 30%contingency and mobilization costs are computed in this quantity. "`NOTE: Per KCC 27A,total bond amounts remaining after reduction shall not be less than 30%of the original amount(T)or as revised by major design changes. SURETY BOND RIDER NOTE: If a bond rider is used,minimum additional performance bond shall be $ 416,931.3 (C+D)-E REQUIRED BOND"AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DDES Page 9 of 9 Unit prices updated: 02/12/02 Version: 4/22/02 kc-bqw-2-4-05.x1s Report Date: 2/9/2005 • - I -- - � l0A OPERAT[ONS AND 1IAINTEN.atiCE I�IAVU:�L I 1 IO1I.004.doc[DED/dm] K�NG COUNTY, WASFi1NGTON, SURFACE WATER DESIGN MANUAL =-. :� 1C.1NG COUNTY, WASHINGTON SLIRFACE WATER DESIGN MANUAL APPENDIX A MAINTENANCE REQUIREMENTS FOR PRIVATELY MA.INTAINED DRAINAGE FACILITIES ; Section No. Subi� 1 Detention Ponds 2 Infiltration 3 Closed Detention Systems 4 Co�t-ol Structure/Flow Restrictor 5 Catch Basins 6 Debris Barriers 7 Energy Dissipaters 8 Fencing 9 Gates , 10 Conveyance Systems ', 11 Grounds 12 Access Roads/Easements 13 Water Gluality Facilities A)Biofiltration Swale B)Filtersirips C)Wetponds D)Wetvaults E)Sand Filters � Leaf Compost Filters G) Infiltration Ponds 14 Oil Control Facilities A)OiU Wafer Separators B)Catch Basin Inserts 9/1/98 KWG COUNT,Y_ WASHINGTON, SURFACE: WATFR DFSIGN MANUAL APPENVIX A �� MAINTENANCE STANDARDS FOR �� PRIVATELY MAINTAINED DRAINAGE FACILITIES NO_ 1 - DETENTION PONDS Mainienance Detect Conditions When Maintenance Results Expected When Component Is Needed Mainte�ance Is Periormed General Trash 8 Debns Any trash and debris which exceed i cubic foot Trash and debns cieared from sife_ per 1,000 square leet(this is about equal to the amount ot trash it would take to fill up one standard size office garbage can). In general, there should be ra visual evidence of dumping. Poisonous Vegetation Any poisonous a nuisance vegetation which No danger ot poisonous vegetation may constrtute a hazard to County personnel a where Caxity persor»el or the the public. public rrrght normatty be. (Coordination with Seattle-Kng C',ounry Heatth Departrr►ent) Pollution O7,gasoline,or other contaminants of one No conlaminants present other than gallon or more or any amount found that could: a surface film. (Coordination with 1)cause damage to plant,animal,or manne Gie; Seattle/Kng G�uniy Health 2)coristitute a fire hazard;or 3)Ge flushed Departrnent) downstream during rain storms_ Unmowed Grass/ If faciGty is bcated in private residential area, When mowing is needed, Ground Cover mowing is needed vrhen grass exceeds 18 grass/ground cover should be inches in height In other areas,the general mowed So 2 inches ui height policy is to make the pond site match adjacent Mowing of selected higher use ground cover and terrain as long as there is no areas rather than U�e enOre sFope • interference with the tu�ction of the facility, may be acceptable tor some situatioru_ Rodent Holes My evidenoe ot rodent hdes if tadGiy is acting Rodents destroyed and dam or as a dam or berin,or any evidence of water berm repaired_ (Coo�nation with piping through dam or bertn via rode�t holes. Seatlfe/Kng Counry Health Departrneni) Insects When insects such as wasps and homets Insects destroyed or removed from interfere with rnaintenance activities. siie. Tree Growth Tree growtl�does not allow maintenance access Trees do not hinder maintenance or interteres with mairnenance activiry(_e_,slope ac.�tivities. Selectivey cuttivate vees mowing,sill�emoval,vactoring,or equipmeni such as alders for firewood. movements)_ If trees are rwt intertering with access,leave trees alone_ Side Sfopes of Pond Erosion Eroded damage over 2 irx:hes deep where Slopes should be stabalized by cause c�(damage is still present or where ihere usirg appropriate erosion controt is potential for co�tinued erosion. measure(s);e_g.,rock reinforcernerrt,planting oi grass, co:npaction_ Storage Area Seciiment /�ccumulated sedimeni that exceeds l0%of the S�ment deaned out to designed desigr,ed pond depth. pond shape and depth;pond reseeded"rf necessary to'contrd. erosion. Pond Dikes Settfements My pari of dike which has settled 4 inches lower Dike should be bu�lt back to the than the design efevation. design elevation_ Emergency Rock Missing Onty one layer ot rock exists above naUve soil in Replace rocks to design standards. Overfbw/Spillway area five square teet or larger,a any exposure of native sal at the top of out flaw path of spiUway. Rip-rap on inside slopes�eed not be replaced. 1998 Surface Water Design Manual 9��g A-1 APPENDIX A h7A1NTENANCG STANDARDS FOR PRIVA7ELY MAINlA1NED DRAINAGE FAGLITIES NO_ 2- INFILTRATION Maintenance Detect Conditions When Maintenance Results Expected When Component Is Needed Maintenance Is Performed General Trash 8 Debris See'Ponds'Standard No. l See'Ponds'Standard No. 1 Poisonous Vegetation See'Ponds'Standard No. 1 See'Ponds"Siandard No. 7 Poilution See'Ponds'Standard No. 1 See'Ponds'Standard No_i Unmowed Grass/ See'Ponds'Standard No. 1 See'Ponds'Siandard No_1 Ground Cover Rodent Holes See'Ponds'Standard No_ 1 See'Ponds'Standard No_ 1 Insects See'Ponds'Standard No_ 1 See'Ponds'Standard No_t Storage Are2 Sediment A percolation test pit or test ot tacility indicates Sediment is removed and/or facility facility is only working at 90°/ct its designed is deaned so that intiltration system capabilioes. If two inches or more sediment is woAcs accordmg to design_ present,remove_ Sheet Cover(It Sheet cover is visible and has more that three Sheet cover repaired or replaced. Applicable) 1/4-inch holes in it. Sump Flted with My sediment and debris filling vault to 70�0 of Clean out sump to design depth. Sediment and Debris depth from sump bottom to boriom ot outlet pipe (H Applicable} or obstructing Aow inio the connector pipe. Ffter Bags FOed with Sediment Sediment and debris fiU bag more than 1!2 full_ Replace filter bag or redesign and Debris system. Rock Flters Sediment and Debiis By visu�inspection,little or no water flows Repiace gravel in rock fiqer. through fiRer during heavy rain storms_ S+de Slopes of Pond Erosion See'Ponds'Standard No_1 See'Ponds'Standard No_t Emergency Rock Missing See'Ponds'Standard No_1 Overflow Sp+llway Settting Ponds and Sediment Remove when 6'or more. Vautts Note_ Sediment accumufa6on oI more U�an 25 inches per yea�may i�cate excessive erosion is occurring up�stream of C�e faci7iry or fhat conveyance systems are not be;ng prope�ly maintained. The contribuiing�irainage area shoufd be checked lor erosion prablems or inadequate ma;ntenance of cbrneyance systems if excessive sedimentation is r.oted in an mfi/trafion laciliry. Check hvice a year during fir�t 2 years of operabon;once a year U�ereafrer. Gean manholes/catcli basins,repa�damaged inlets/outlets, dean Lash radcs_ 9/1/98 1998 Surface Water Design Manuai A-2 i APPENDIX A MAIN7F,NANCE STANDARDS FOR PRIVA7FI.Y MAIf1TA1NED DRAINAGE FAC1LTiTFS . NO_ 3- CLOSED DETENTION SYSTEMS(PIPESJTANKS) Maintenance Defect Conditions When Maintenante is Needed Results Expected When Component Maintenance is Periormed 'Storaye Area Plugged Air Vents One-half of tfie cross section of a vent is blocked at Vents free of debris and any point with debris and sediment sediment Debns and Accumulated sediment depth exceeds 10%of 1he All sediment and debris Sediment diameter ot�e storage area for'k le�gth of storage removed from storage area. vault or any point depth exceeds 15%of diameter. Example:72-inch storage tanlc would require dearang when sediment reaches depth of 7 inches fa more than 34 length of tank. Joints Between Any crack allowing materi�lo be transported into All joint between tank/pipe TanWPi�e Section tacility secaons are sealed Tank Pipe Bent Any part oi tank/pipe is bent out oi shape more than Tank/pipe repaired or replaced Out of Shape 10%oi iYs design shape to design. Manhole Cover Not in Place Cover is missing or oMy partially in place.My open Manhole is dosed_ manhole requires maintenance. Locking Mechanism cannot be opened by one maintenance Mechanism opens with proper Mechanism Not person with proper tools_Botts iMo frame have less tools_ Working than 14 inch ot thread(may not apply to setf-locking 1ids.) Cover Difficutt to One maintenance person camot remove Gd after Cover can be rertioved and Fiemove applying 801bs of tift. InteM is to keep cover from reinstalled by one mainienance seafing ott access to maintenance_ person. Ladder Rungs King C,ounry Satery Office andJor maintenance person Ladder meets design standards i Unsafe judges that ladder is unsafe due to missing rungs, a9ows maintenance person safe misalignmenk rust,or cracks. access_ ;Calch Sasins See'Catch Basins'Standards tJo_5 See'Catch Basins'Standards �i No.5 I 1998 Surfacc Watcr Dcsign Manual 9/1/98 A-3 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINFD DRAINAGE FACILfiIES NO. 4 - COfvTROL STRUCTURE/FLOW RESTRICTOR Maintenance Defect Condition When Maintenance is Needed Resutts Ezpected When Component Maintenance is Performed � General Trash and Debris Distance beiween debns build-up and bottom of All irash and debns removeti_ (Includes Sediment) onfice plate is less than t-7/2 teet. Strudural Damage Structure is not securely attached to manhole wall Structure securely attached to and outlet pipe structure shouid support at least waH and ontlet pipe 1,000 lbs oi up or down pressure. Sinich�re is not in upright position(allow up to SVucture in correct posiUon_ 10%lrom plumb). Connections to outlet pipe are not watertight and Connections to outlet pipe are show signs of rust_ water tighY,structure repafred cr replaced and worics as designed. Any holes—other than designed holes—in the SVucture has no holes oiher sUucture. thart designed holes_ Cleanout Gate Damaged or Missing Cleanout gate is not watertight or is missing_ Gale is watertighi and works as designed. Gale cannot be moved up and down by one Gate moves up and down ea�ily maiMenance person. and is watertight Chain leading to gate is missing or damaged. Chain is in place and works as designed. Gate is rusted over 50%of i[s surface area. Gate is repaired or replaced to meei design standards.. Orifice Plate Damaged or htissing Control device is not workirig property due to P1ate is in place and worf�s as rrtissing,out of place,or bent orifice plate. designed. Obstructions My trash,debris,sedimeni,or vegetation Plaie is free ot all obstructions blocking ihe plate. and works as designed_ Overflow Pipe Obstructions My trash or debris Dlocking(or having the Pipe is free of aIt obstructions poten6al o(blodcing)the overtbw ppe. and works as designed. Manhole See'Cbsed Detention Systems'Standards No.3 See'Cbsed Deientio�Systems' Staridards No_3 Catch Basin See'Catch Basins'Standards No_5 See'Catch Basins'Standards � No.S ' 9/1/98 1998 Surface Watcr Dcsi�Manual A-4 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY N1AlNTA1NED DRAINAGE FACILfiIES NO. 5-CATCH BASINS Maintenance Delect Conditions When Maintenance is Needed Resulls Expected When Component Maintenance is performed , , eneral Trash&Debris Trash or debns o1 more than t/2 cubic toot which is No Tcash or debris locatecl (Indudes Sediment) located immediately in front of the catch basin immediately in front of catch openfng or is blocking capacity of the basin by basin opening. more than 70% Trash or debns(in the basin)that exceeds 1/3 the No irash or debris in Ihe a3tch depth from the boriom of basin to invert the lowest bar,in_ pipe into or out of the basin. Trash or debns m any inlet or outlet pipe blocking Inlc-t ar,d outl��t pipe�hc�ef more lhan 113 ot its height_ tra�h or debris_ Dead animals or vegetaUo�that could generate No dead animals or vegetation odors that could cause compfaints or dangerous present within Uie catch basin_ gases(e.g_,methane). Deposils of garbage exce�ng t cubic fooi in No condition present which volume would attrad or suppoA the breeding of insects or rodents_ Structure Damage to Comer of frame extends more than 3/4 inch past Frame is even with curb_ Frame a�d/or Top S1ab curb face into the street�If applicable). Top slab has holes larger thar►2 square inches or Top slab is tree of holes and aacks wider thari 1/4 inch(intent is to make sure cracks. all matertal is ruruiing into basin). i Frame noi sitting flush on top slab,i.e.,separation Frame is sitting flush o�top of more than 3!4 inct►of the irame fmm the top slab. slab. Cracks in Basin Walls/ Cracks wider than 1!2 inch and bnger than 3 fee� Basin replaced or repaired to Bottom any evidence of soil particles entering catch basin design standards. through cradcs,or maintenance person judges tfiat structure is unsound_ Cracks wider than 1!2 inch and longer than 1 toot No crac'cs more than 1/4 inch at the joini of arry in1eU outlet pipe or any evidence wide at the joint ot inleVoutlei of sod partides entering catch basin through pipe. cracks. SedimenU Basin has settled more than 1 u�ch or I�.rotated Basin replaced or repaired to Misalignment more Than 2 inches out ot alignment design standards. 1998 Surlace Watu Dcsi�Manual 9/1/98 I A-5 I qppENDlX A MA1N7�NANCG STANDARDS FOR PR1VA"IEI_Y MAINTAINED DRAINAGE FACILIT[ES NO. 5-CATCH BASINS (CONTlNUEI7� Maintenance Detect Conditions When Maintenance is Needed Results Expected When Component Maintenance is periormed � i Fire Hazard Presence of chemicals such as natural gas,al and No flammable chemicals � gasoline. present. Vegetation Vegetation growing across and blocking more than No vegetation blocking opening t0%o(�e basin opening. to basin. VegetaDon growing in inleUoutlet pipe jants that is No vegetation or root growth more Uian six inches tall and less than six inches present. apaR Pellution NonflammaWe chemicals of more than 1/2 cubic foot No pollutio�present other than per tluee feet ot basin length_ surface film. Catch Basin Cover Cover Not�n F'lace Cover is missing or onfy partia)ly in place_Any open Catch basin cover is cbsed catch basi�requires maintenance. Locking Mechanism Mechanism cannot be opened by on maintenar►ce Mechanism opens with proper Not Woricing person with proper toots.BotLs into hame have less tools. than 12 inch of thread_ Cover Difficutt fo One maintenance person cannot remove 6d after Cover can be removed by one Remove applying 80 Ibs_of irfi;interrt is keep cover from maintenance person. seaGny ott access to maintenance. Ladder Ladder Rungs Ladder is unsate�ue to missing rungs,misalignment, Ladder meets design standards Unsafe rust,cracks,or sharp edge� and allows mainienance person sate access_ Mehal Graies Grate with opening wider than 7/8 incn. Grate opening meets design (If AppGcabte) standards. Trash and Debas Trash and debris tfiat is blocking more Uian 20%of Grate free of hash and debris. grate surface_ Damaged or Grate missing or broken member(s)ot the grate. Grate is in place and meets Missing_ design standards. NO. 6 DEBRIS BARRIERS(E.G.,TRASH RACKS) , Maintenance Defect Condrtion When Mai�tenance is Needed Resutts Expected When Components Maintenance is Periormed_ General Trash and Debris Trash or debris that is plugging more ttian 20%of Bamer dear to rece'rve capacity the c,pe�ings in the barrier. flow. Metal Damaged/Missing Ba�s are bent out of shape more Uian 3 inct�es. Bars in place with no bends more Bars. than 3/4 aKh_ Bars are missing or entire barrier missing. Bars in ptace according to design- 8ars are loose and rust is causing 50`�6 deterioration Repair a replace barrier to to any part of barrier. design standards. 9/1/98 1998 Surface Watcr Desegn Manua! A-6 APPFNDIX A MAIMFI4ANCE STANDARDS FOR PRIVATII.Y MAINTAINFD DRAINAGE FACiLITTES NO_ 7- ENERGY DlSSIPATERS Maintenance Defeet Conditions When Rlaintenance is Needed Results Expected When Components Maintenaoce is Performc�d xtemat: 'Rock P2d Missing or Moved Only one layer of rock exists above native so�l in Replace rocks to design Rock area five square feet or larger,or any exposure ot standards_ native soil_ Dispersion Trench Pipe Plugged with Accumulated seciiment ttiat exceeds 20�0 of the Pipe deaned/flushed so Uiat n Sedimenl design depth. matcf�es design. Not Discharging Visual evidence of water discharging at Trench must be redesigned or Water Properly concenVated points along trench(normal condition rebuilt to st�3ndards. is a'sheel Oov�I'of water abng trench).Intent is to prevenl erosion damage. PeAorations Over 1/2 ot perforations�n pipe are plugged with Glean or replace pertoraled pipe. Plugged_ debris and sediment. Water Flows Out Maintenarice person observes waier tlowing out Fadlity must be rebuilt or Top of'Distributor' during any storm less than the design storm or its redesigned lo standards. Catch Basin_ pusing or appears likely to cause damage. Receiving Area Water in receiving area is causing or has potentia! No danger of landslides. Over-Saturated of causing landsfide problems_ Intemal= Manhole/Chamber Wom o�Damaged SUucture dissipating flow deteriorates to 1/2 or Reptace structe�re to design Post_Battles,Side original size or any ooncentrated wom spot standards. o(Chamber exceedng one square foot which would make structure unsound. Otfier Defects See'Catch Basi�s"Standard No_5 See'Catch Basins'Standard No. 5 1998 Surface�Vatu Design Manual 9/1/98 A-7 urn� m IANLfAKllJ i-UK F'K1VA 1�1,Y MAIf�TAINED DKAINAGE hAC ILl 1It=S NO_8- FENCiNG . Maintenance Defect Conditions When Mai�tenance is Needed Results Expected When Components Maintenance is Periormed -"`j�General Missing or Broken Any defect in the fence that permits easy entry Parts in place to provide adequate Parts to a taciliry. secunty Erosion Erosio�more than 4 inches high and 12-18 No opening under the fence that I inches wide permitting an opening under a exceeds 4 inches in he�gM. , fence. Wire Fences Damaged Parts Post out ot plumb more than 6 inches. Post plumb to w;thm 1-112 inches. Top rails benl more than 6 inches. Top rail hee of bends greater than ' 1 inch. Any part ot lence(including post,top rails,and Fe�ce is aligned and meets design i tabric)more than 1 foot out of design alignment_ standards_ Missing or toose tension wire. Tension wire in place and holding tabric_ Missing or loose barbed wire that is sagging Barbed wire in place wiih less than more than 2-1/1 inches between posts. 3/4 inch sag between post Exteruion arm missing,broken,or bent out oi Extension arm in place with no shape rtare tfian 1 12 incfies_ bends larger tlian 3l4 inch. ' Deteriorated Paint or Part or parts that have a rusting or scaling Stn�cturally adequate posLs or Protective Coatino conditio�that has afiected structural adequacy. parts with a unAorm protective coating_ Operrngs in Fabric Operungs in fabric are such that an 8-inctr No openings in fabric_ dameter ba1 cadd frt thraugh- NO.9-GATES 4aintenance Defeci Conditions When Maintenance is Needed Resutts Expected When Component Maintenance is Pertormed Genera! U�amaged or Missing Missing gate or lodcing devices. Gates 2nd Locking devices in Members place_ Broken a missing hinges such that gate cannot Hinges intad and lubed.Gate is be easity opened and dosed by a maintenance work;ng freely. Person. Gate is out of pl�anb rrare B►an 6 indies and Gate is�gned and vertica!_ more than 1 toot art of design aligrunenL Missing sireicher bar,stretcher bands,and ties_ SVetcher bar,bands and ties in place_ Openings in Fabric See'Fencing'Standard No.8 See"Fencing'Standard No_8 y��8 1998 Surfacc Watcr Design Manual A-8 APPENDIX A MAI[ST-ENANCE STAIVDARDS FOR t'RIVA7F1_Y fv1Alf�fl�AIfYF�DRAINAGEFACILI'TIES �, NO. 1 U- CONVEYANCE SYSTEMS(PIPES & DITCHES) , Maintenance Detect Conditions When Maintenance is Needed Results Ezpected When I Component Mainte�ance is Pertormed I Pipes Sedfinent&Debris Accumulated sediment that exceeds 209b ot the Pipe cleaned of aU sediment li diameter of the pipe. and debns. li ✓egetation VegetaUon that reduces iree movement ol water All vegetation removed so water III through pipes. flows treely through pipes. I Damaged Prolective coating is damaged;rus!is causing Pipe repaired or replaced_ more than SO%deteriorabon to any part of pipe. Any dent that decreases the cross sect,on area of Pipe repaired or replaced. pipe by more than 20%. � Open Ditches Trash 8 DeGris Trash and debris exceeds 1 cubic fooi per 1,000 Trash and debris Geared from , square teet of ditch and slopes. difc�es. Sedfinent Accumulated sediment that exceeds 20%of Uie Ditch deaned/flushed of aJl ' design depth. sediment and debris so ihat it matcties design_ Vegetation Vegetation that reduces iree movement of water Water flows freety through througn dAches_ ditches_ Erosion Damage to See'Po�ds"Standard No_ t See'Ponds"Sfandard No.1 Stopes , Rock lining Oul of Maintenance person can see native saI beneath Replace rocks io design Place or Missing(If the rock fining_ standards. Applicable)- Caich Bas.ns See'Catch Basins:Standard No.5 See"Catch Basins'Standard No.5 Debris Barriers See'Debris Barriers'Standard No.6 See"Debris Bartiers Standard (e_g_,Trash Rack) No.6 , Na_ 11 -GROUNDS{LANDSCAPING) � Maiotenance Defect Conditions When Maintenance is Needed Resutts Expected When i Component Maintenance is Performed General YJeeds Weeds growing in more than 20%of ihe landscaped Weeds present in less than 5% (Nonpoisonousj area(trees and shnibs only). of the landscaped area_ Safety Hazard Arry presenoe of poison ivy or other poisonous No pasonous vegetatio� vegetation_ present in landscaped area. 7rash or Litter Paper,cans,bottles,totaling more than t cubic foot Area dear of Irtier_ within a landscaped area(Vees and shrubs only)of , i,000 square feet I 7rees and Shrubs Damaged Limbs or parts of trees or shrubs that are split or Trees and shrubs with less U►an broken which afied more than 25%ot the total 5%of total tofiage with split or fofrage of the tree or stirub_ broken Gmbs_ Trees w sh►ubs that have been bbwn down or Tree or shrub in place free of knocked over_ injury. �_ Trees a shrubs which are not adequately supporied Tree or shrub in place and or are Ieaning over,causing exposure ot the roots. adequately supported;remove any dead or diseased trees. 1998 Surfacc Water Desi�Manual 9/1/98 A-9 APPENDIX A MAlrfi-ENANCE STANDARDS FOR PRIVATELY MAIM'AII`'ED DRAINAGE FACILTIlES NO. 12-ACCESS ROADS/EASEMENTS Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed `�General Trash and Debns Trash and debns exceeds t cubic toot per 7,000 Roadway free of detrns which square feet i.e.,trash and debris would fill up could damage tires. one standards s¢e garbage can_ Blocked Roadway Debns which could damage vehicle lires(glass Roadway free ot debns which or metal). could damage tires. Any obstruction which reduces clearance above Roadway overhead dear to 14 feet road surface to less than 14 feet high_ Any obstruction reslricting the access to a 10 to Obstruction removed to atlow at 72 foot width for a distance of more than 12 feet least a 72 toot access. or any point restricting access to less than a 10 foot width. Road Surface Settlement,Potholes, When any surtace defect exceeds 6 inches in Road surface uniformly smooth Mush Spots,Ruts deptfi and 6 square teet in area.In general,any with no evidence of settfement, s�rface defect which hinders or prevents potholes,mush spots,or ruts_ maintenance access. Vegetatio�in Road Weeds growing in the road suAace that are Road surtace hee o!weeds tadef i Surface more than 6 inches tatl and less than 6 ir�es than 2 inches. tafl and less than 6 inches apart within a 400- square fooi area_ Modular Gcid Build-up of sedimeni mildly contaminated with Removal of sediment and disposal Pavement petrdeum hydrocarbons. in keeping with tiealM Departrnent recommenda6ons for rruldiy contaminated sals or catch basin sediments. Shoulders and Erosion Damage Erosion witfiin t toot of Uie roadway more Cian 8 Shoulder hee of erasion and Ditches inches wide and 6 inches deep_ matching the surrounding road_ I Weeds and Brush Weeds and brush exceed 18 inches in heighi w Weeds and br�sh cut to 2 a�ches I hinder maintcnance access. in height or deared in such a way ' as to allow maintenance access. 911�8 1998 Surface Water Design Manual A-10 APPENDIX A MAlf�fiFNANCE STANDARDS FOR PRIVATFI..Y MAII1i'AINFD DRAINAGE FACILTI7ES NO. 13-WATER �UA�fTY FACILIl1ES A_) Biofiltration Swale Maintenance Detect Condition When Maintenance is Needed Resulis Expected When 'omponent Maintenante is Performed Biofiltratien�wale Sedimern Ar_cumulation Sedfinent depth exceeds 2-inches No sediment deposits on grass II on Grass L<,yc r tayer of the bio-swale,wfiich would impede fiitratio�of ru�oft_ i VeqeL3t�on When the grass becomes excessively tall Vegetation is mowed ot nuisance I' (qreater than 70 fnches);�fien nuisance weeds vegetatio�is eradicated,sudi ihat I and other vegetation starts to take over. flow not impeded.Grass should be 'I mowed to a height between 4 inches and 9 inches. Inlet Outlet P�pe InIeU outlet ppe clogped�nnth sediment and/or No clogging or blockage in the inlet li� debris_ and outtet piping_ ' Trash and Debris Trash and debris accumulated in the bio-swale_ Trash and debris removed from ' Accumufation bioswale. �� Erosion/Scouring Where the bio-swale has eroded or scoured Bioswale should be re-graded and the bottom due to flow channelization,or higher re-seeded to tpecificatio�,to flows_ e6minated ct►anneled flow. Overseeded when bare spots are evident N0. 13-WATER QUALfTY FACIL1l1ES(COM7NUE1� B.) Grasslined Filter Strips ', Maintenance Qefect Co�dition When Maintenance is Needed Results Expected When i Component Maintenance is Perfortned I �ilier Strip SecSment Acc�mulation Sediment depth exceeds 2 inches_ No sedment deposits on grass ��i on Grass Layer layer ot the fitter strip,which woufd impede fitbation runoff_ Vegetation When tlie qrass becomes excessively tall Vegetation is mowed or rni�isance (greater than 1Qinches);when nuisance weeds vegetation is erad'icated,such U�at and other vegetation starts to take over. flow not impeded.Grass shoutd be mowed to a height between 4 ir#tes and 9 indtes_ Trash and Debris Trash and debris accumulated on ttie filter Trash and Debris removed trom Accumulation strip. fitter. Erosion/Scouring Where the fiRer strip has eroded or scoured Strip should be re-graded and r� d ue to flow channelization,or higher flows. seeded specifx:ation,to eliminate chameled flow.Overseeded whe� bare spots are evident V-Notch Pipe Weir When the V-Notcti pipe becomes darnaged or Cteaned and prope�tylfunction7ng clogged with sedimenU debris_ weir,such that flows uniformly spread. 1998 SurCace Watcr Design Manual 9�1/9g A-11 APPENDIX A MAINTFJdANCE STANDARDS FOR PRIVA7LLY MAINTAINED DRAINAGE FACILITIES . C_) Wetponds Maintenance Delect Conditio�When Maintenance is Needed Results Expected When Component Maintenance is Performed Wetpond Vegetation Vegetation such as grass and weeds need to be Vegetation should be mowed to mowed when it starts to impede aesthetics of po�d. 4 to 5 inches in height. Trees Mowing is generally req�nred when height exceeds and bushes should be removed 18-inches.Mowed vegetation should be removed where they are interfenng witfi trom areas where it could enter the pond,eiUier pond maimenance acUvities. when the pond level rises,or by rainfall runoff. Trash and Debris Accumulation that exceeds 1 CF per 1004SF of Trash and debris removed from pond area. porid_ InIeV Outlet Pipe InIeV OuUet pipe clogged with sediment and/or No dogging cr btockage in the debris material. inlet and outlet piping. Sedirtier�t Sediment accumulabons m pond bottom that Removal of sediment from pond Accumulation in Pond exceeds tl►e depth of sediment zone plus 6inches, bottom_ Bottom usually the first cetl. OiI Sheen on Water Prevalent and visible oil sheen_ Rernovat o!sediment hom pond bottom. Erosion Erosion of the pond's side slopes and/a scou�ng of S{opes shoufd be stabilized by the pond bottom,that exceeds Eincfies,or where using proper erosion control continued erosion is prevalent measures,and repair methods Settlement of Pond Any part of these cort�ponenis that has settled 4 Dike1 berm is repaired to Dike/Berm i�or lower Uian ths design elevaUon,a specifications. inspector determines dilce/berm is unsoixid_ Rodc Window Rodc window is clogged wilh�merrt. Window is iree of sediment and debris_ Overflow Spillway Rodc is missing and soit is e�osed at Iop of Replace rocfcs to specifications_ spilMay or outside sbpe- 9/1/98 1998 Surfacc Watcr Dcsign Manual A-12 APPENDIX A h1AINTENANCE STANDARDS FOR PRIVATELY MAIt1I'AINED DRA[NAGE FACILIT7ES NO. 13-WATER C�UALITY FACILITIES(CONTINUED� D.)Wetvaults Mai�tenance Detect Condition When Maintenance is Needed Results Expected When � Component Maintenance is Performed Wetvault Trash/Debns Trash and debns accumulated in vault,ppe or Trash and debris removed Irorn Accumulation inleV outlet,(includes floatables and non- vault Iloatables). Sediment AccumulaUon Sediment accumulation in vault bottom that Removal of sediment from vault. in Vault exceeds ihe depth of the sediment zone plus 6- inches. Damaged Pipes Inlet/outlet piping damaged or broken and in Pipe repaired and/or replaced. need ot repair. Access Cover Cover cannot be opened or removed,especiaUy Pipe repaired or replaceci to Damaged/Not Woricing by one person. proper working specificalions. Vautt Structure Vautt Cracks wider Uian 1/2-"s�ch and any No cracks wider than 1/4-inch at Damaged evidence of soil partides entering the structure the joint of the in1eU ouUet pipe. through the aacks,or maintenanceJ i�spection Vautt is determined to be personne!detem►ines tha2 the vault is not struchxally sou�d. structurally sour►d_ Baffles Baffles oorroding,cradcing,warping and/or Repair or replace batfles to showing signs of failu►e as detemMned by specifications_ maintenar►ce/inspection staft. Access Ladder Damage Ladder is corroded a deteriorated,not func6or�ng Ladder replaced or repaired to P��h/.�9�9s.has cradcs and/or specificatioru.and is safe to misaligned_ use as determined by inspection Personnel- 1998 Surface Watu Dcsign Manual 9/1/98 A-13 APPEND)X A MAIMENANCE STANDARDS FOR PR7VATELY MAINTpfNED DRA]NAGE FACILiT7ES � NO_ 13-WATER GlUALITY FACILITIES(CONTINUEDj , E.) Sand Filters Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Periormed Above Ground Sediment Sediment depth exceeds 1/2-inch_ No sediment deposit on grass Accumulation on Grass layer ot sand filter which would Layer impede permeabiliry of the filter section_ Trash arxi Debns Trash and debris accumulated on sand filter bed. Trash and debris removed from Accumulations sand fitter bed_ SedimenU Debris in When the yard drain CB's and dean-out become Sediment,material from tt�e Yard Drainsl Clean- tull or partialty plugged with s�ment and/or CB's and clean-outs removed. Outsj debris. Vegetanon When the grass becomes excessively tall(greater VegetaDon is mowed or than 6-inches);when nuisance weeds and other nuisance vegetaUon is vegetation starts to take over_ eradipted,such that flow is not impeded_ Sand Filter Med�a Drawdown ot water through the sand filter media, Usually requires replacement ot takes longer than 24hours,and/or flow throvgh top 6 to 12-inches of inedia_ the overflow pipes occurs hequeniiy. May require reptacement of entire sand idier secSon, dependmg on section_ Prolonged flows Sand is saturated tor prdo�ged periods of time limit the low,continuous flows (several weeks)and does nof dry out between to a smal)portion of the facility stomu due to continuous base flow or prolonged by use�g a bw wooden dvider or tbws from deferrdon taciGties_ sGghtly depressed sand surface. Short Circuiting When flows become concentrated over the sand Fbow and percolation d water filter rather than dispersed. through the sand fitte�is uniform and dspersed aaoss 1he fifter section. Erosion Damage to Erosion over 2-irtches deep where caus2 of Slopes st�ould be siabilized by Slopes damage is prevaient or potential!w continued using prooer erosion control erosion is evident measures. Rocic Pad N6ssi�g or Soil beneath the rodc is visible_ Replace or rebuild the rock pad Out of Place to design specifications_ V-Notch Pipe Weir When the V-Notch pipe becomes damaged or Clean and properly tunctioning dogged with sedimenV debris. weir,sucxi that flows uniformty spread Damaged Pipes My part of ihe piping that is crushed or deformed Pipe repaired or replaced_ more than 20%a arry other failure to the piping_ Below Ground S�ment Sediment depth exceeds 1/2-inch. No�ment deposits on sand Vault Accumuiation on Sand fifter section,which would Media Secticxi impede permeability ot the fitter section. Sediment Sediment depth exceeds 6-inches in vault bottom. No sedment deposit in the first Accumula5on in Vau1t chamber of the vautt Trash/Debris Trash and debris accurnulated in vauR,or pipe Trash ar►d debris rerrtOyed from Accumulation in1eU outlet,floatables and non-floataWes vautt,and in1eV outlet pipng- Sedanent in Drain VYhen drain pipes,cleanouts,and yard drains Rernove the material from the Pipes/Yard Drai�sl become full with sediment and/ot debris_ facilities_ Cleanouts 9/1/98 1998 Surfacc Watcr Duign Manual A-14 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATEZY MAlNTA1NED DRAINAGE FACILITIES NO. 13-WATER QUALtTY FACILITIES(COMINUEfJ� E.) Sand Filters (Continued) Maintenance Defect Conditions When Maintenance is Needed Resulis Expected When � '{:omponent Maintenance is Performed ? Below Ground Short Circuiting Whe�seepagel flow occurs atong ihe vautt walis Sand filter media seciion r�laid Vault(Continued) and corners_ and compacted along penmeter oi vault to torm a semi-seai. Vertical Riser Pipes Pfugged,tailure due to cradcing deformation.F)ows Clean out the riser pipe;replace tend to back-up in first chamber d the vault_ pipe as needed_ Damaged Pipes Inlet or outlet piping damaged or broken and in Pipe repaired andl or replaced_ need of repair. Access Cover Cover cannot be opened,one person cannot open Cover repaired to proper Damagedl Not the cover,corrosion/deformation ot cover. working specificalions or Working �eplaced_ Vault Struciure Cracks wider U►an 1r2-inch and arry evidence of soil Vautt replaced or repaired to Damaged;Indudes partides entering tfie structure through the cracks, design specifications_ Cracks in Watls, or maintenanceJ rc�spection personnel deteRnines Bottom,Damage to that the Yautt is noi sUucturallyr sound. Frame and/or Top Slab_ Cracks wider than 1r2-inch at tfie janLs of any inleV No cracks more than t/4�nch outlet pipe or any evidence of sod particles entering wide at the joint ot tt�e inleV the vault through ttie walts. ouUet pipe. Baffles Baffles corr�ng.aacl�ing,vrarping and/or showing Repair or replace baffles to signs of fadure as detertnined by maintenance,! specifica5ons. �P��- Access Ladder Ladder is cortoded a deteriorafed,not functioning Ladder replaced or repaired to Damaged p►opedy,rt►issin9 nm9s.cracks,and misaligneci. specifcations,and is sate to t use as determined by inspec.-tion personnel. I� - 1998 Surfacc Watu Design Manual 9/1/98 A-15 i tNANCE STANDARDS FOR PRIVA"iF1.Y h1A1NTAINED DRAINAGE FACILIT7FS NO. i 3-WATER QUALITY FACIL(iIES(CONTINUEC� F.) Leaf Compost Filters Maintenance Detect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Pe�iormed �� Above Ground Sediment Sediment depth exceeds 025-inches. No sediment deposits on tab��c Open Swale accumulation o�Geo- layer which woufd impede Textde/media permeability of the fabnc Trash and debns Trash and debris accumulated on compost filter �i rash and debris removed trom accumulations bed. compost filter bed. SedimenU debris in When the yard drain CB's and cleanouts become Remove the accumulated drain/yard drains/ tul!of sediment and/or debns. material horn the tacility. clean-outs. Vegetalion Vegetation impendfng flow through sedion,or Vegetation is mowed or encroactiing into compost media. e�adicated such that flow is no longer impeded_ leaf Compost Media Drawdown of water through the leaf oompost, Replace media with new to takes longer than 12-hours,and/or flow through design specifications,in addition the overftow p"�pes occurs frequentty_ to replacing fabric. Short-Circuiling When Channeled flow occurs over the leaf ined�ia; Flow is�iform over the entire and where flow perlcs through the media at the width of ihe media secbon,and baffles_ ooncer�trated percota8on does not oocur at the baifle wails. Media needs to be graded and re-set at the batfles to form a seal_Weir plate may need to be adjusied'm additic�n_ Erosion Oamage to Eroded damage over 2-inches deep where cause Slopes should be stabilized by Slopes of damage is prevalerrt or potential for continued using proper erosan coniro! erosio�is prevalent. measures_ ` � Damaged Geo-TexUle When fabric is 2om,deteriorated,raveled,etc. Fabric replaced as necessary_ ` Fabric_ Rock Pad Missing or Sal beneath the pad is visible. Replace a rebuild 1he rocic pad out of place to design standards. Damaged Pipes My part of the pipe system that is crust►ed, Pipe repaired or reptaced. damage due to corcosion,and!or settlement V-Notch Weir Flow is not Deing uniformfy s�xead over fitter Clean,repair or replace the weir Assemblies med�a systems. Below Ground Sediment SedQnent depth exceeds 025-irx:hes. No seduneni deposits ori iabric � Vautt Acamiulatiort on Geo- layer which would irnpEde I Textilef Media permeabiC�ty of the fatxic and I compc�st media_ Sed"unent Sedmerrt depth exceeds 6-ir�es in first cfiamber. No sedment deposits in vautt Accumulation i�Vault bottom of first chamber. Trash/Debris Trash and debris accumulated on compost filter Trash arxi debris removed from Aoam►�ation bed_ the compost filter bed. Sedimerrt in Drain When drain pipes,dearrarts,yar�d drains become Rernove the accixnulated Pipes!Yard Drains/ futl with sed'nnerrt and/or debris_ material trom the faaBties. Clean-Ou1s 911/98 • 1998 Surface Watcr Dcsion Manual A-16 APPENDIX A MAINTENANC[ STANDARDS FOR PRIVATEI_Y MAINTAINED DRAINAGE FACILfITES NO. 13- WATER GIUAL(TY FAClLfT1ES (CONTINUED� F.) Leaf Compost Filter(Continued) Maintenance Defect Condition When Maintenance is Needed Resutis Expected When `_ �;omponent Maintenance is Pertormed } Below Ground Leat Compost Media Drawdown of water through the leaf compost,takes Replace media with new longer than 12-hours,andl or oveAlow occurs compost to specifications,in frequently. addilion to replacing fabric_ Short CircuiUng When seepage occurs along the vau11 watt and Percolation of water occurs comers occur_ along tlie walls and oomers and not tFxough the rt►ed�a section. Media needs to be re-set along the vault wall and comers to form a semi-seal. Plugged/Damaged Flow tends to backup unusually high in the firsS Clean out the elbow firongs and/ Elbows chamber ot the vautt_ or replace rf damaged. ii Damaged Geo-Textile Fabric is tom,deteriorated,raveled,etc_ Fabric replaced as necessary_ Fabric Rock Pad Missing or Soil beneath ihe pad is visibte_ Replace or rebuild the rodc pad Out d Place to design standards. ' Damaged Pipes Any part of the pipes that are cnuhed.darnaged Pipe repaired and/or replaced. due to corrosion and/or settlement Access Cover Cover cannot be opened,one person cannot open Cover repaire•1 to proper Darnaged/Not the cover,corrosaN defortnation of cover. worldng specifications or Working replaced. V-Notch Weir Flow does not spread uniformly over fitler media by qean,repair and/a replace the Assemb(ies weir section_ weir plate section,a adust �- �t Vault Structure Cracks wider ihan 1/2-ir�►and any evidence of soit Vautt replaced or repaired to ' Indudes Gacks in partides eMering the strudure ttuough the cracla, design specifications_ WaB,Bottom, or mairKenanceJ inspec.�tion personnel detemrnes Dart�age to Frame ihat the vault is not struclurally sound. andJ or Top Slab Baffles Baflles corrodng,cradong warping,and/or showi�g Repair or replace baffles to signs of failure as detemrincd by maintenar►oPJ specificalion. inspection p�rson_ Acoess Ladder Ladder is corroded or deteriorated,noi iunctioning Ladder replaced or repaired and Damaged property,missin9 nm9s.cracks,and misaGgned. meets speafiqtions,and is safe b use as detertnined by inspection persanel. Cracks wider U1an 1!2-incfi at the joini d any No aacks mwe than 1/4-inch inleVoutlet pipe or any evidence d sod partides wide at the joint d tt►e inleV entering the vauft through the rralls_ a�tlet pipe. 1998 Surface Watcr Design Manual 9/1/98 A-I'7 APPENDiX A MAIMENANCE STANDARDS FOR PRNA7FI,Y MAINTAl1YED DRAINAGE FACILfIIES NO. 13-WATER DUALtTY FACILfiIES(CONTINUED� G.} Infiltration Ponds Maintenance Defect Condition When Maintenance is Needed Resutts Expected When �f -,, Component Maintenance is Performed E� lnfilhation Pond Vegetation Vegetabort such as grass and weeds needs to be Vegetation should be mowed to mowed when it siarts to itnpede infiltration fundion. 2-inches in height.Trees and Mowing is generally requaed when height exceeds bushes should be removed 12 inches. whe�e they impact the infiflrating area of the pond. Sand Flter Layer Sand filter layer has sediment deposits that exceeds Remove sediment and top layer 1!2-inch or the infittration rate of ihe sand layer is of sand,and replace in kirxf per less than 2 in/hr. specification. Sediment Sediment accumulations in pond bottom that Removal o(sediment from pond Accumulation in exceeds 12-inch in depih or percolation test of the bottom_ ' Pond Botlom pond indicates taaGty is only woricing at 90'/of iYs I design percolation rate_ Trash and Oebris Accumulabon that exceeds i-CF per 1,OOU-SF oi Trash and Debris rernoved from pond area. pond_ INeV Outlet Pipe INeV outlet pipe dogged with sediment andl or No dogging or blockage in the debris materiai. intet and outlet piping. Erosion Erosion oi the pond's side sbpe and/or scouring d Slopes stwuld be stabif¢ed by U►e pond bottom,that exceeds 2-inches,or where using proper erosion corYtrol poterrDa!for continued erosio�is prevaferrt measures and repair methods. Sedunent of Pond My part of Uiese ownponer�tlial Itas settled 4- S1ope5 should be stabi6zed by DikeJ Bertn inches or lower than the de.sign eleration,or whe�e using proper erosio�oontrol potential for co�nued erosion is prevalent measures and repair methods_ Rodc Window Rodc window is dogged with sedanent Window is free ot sediment and debris. Overflow SpiBway Rodc is missing and sal is e�ed RepJace rocks to specifications_ Infittration VautU Sedment Tanks:Sediment depth exceeds 6inches in depth. No sedunen2 deposiis in tank Tank Accumutation in bottom_ Vautt Trash and Debris Trasfi and debris aocurtu�lated ir►tank,vault or Trasti and debris removed from Accumula6on connectin9 P�Pe.lndu�des floatables and non- each fadfiy- floatables. Access Cover Cover carnot be operied or removed,espeaaRy by Cover repaired or replaced to Damaged/Not o�e person. proper worldng speci6cations or Worlti�9 replaoed- Tank or Vault Tanic Joints between tardc sections failing,such that Tank replaced or repaired lo Structure Damaged leakage occtas and or material being washed design specifications. - Vrough inb�fac�ty;a mairrtenar►ocJ inspection person determines the Yank is not stnicturalty sound. 9/1/98 1998 Surfacc Watu Dcsign Manual A-18 APPENDIX A MAINIENANCE STI�VDARDS FOR PR1VA7�ELY MAINTAINED DRAINAGE FACILIT[ES NO_ i 3-WATER QUALITY FACILITIES(CONTINUEI� G.) Infiltration Ponds (Continuec� Maintenance Deted Conditions When Maintenance is Needed Results Expected When �omponent Maintenance is PerioRned lnfiltration VauIV Tank or Vaufl SVuctural Vault:Cracks wider than 1!2-inch and any Tank replaced or repaired to Tank ��ge evidence of soil partides entering ihe structure design specifications. through the cracks,or maintenance inspeclion personnel determines that the vault is not structurally sound. Access Ladder Damaged Ladder is corroded or detenorated,�ot ladder replaced or repaired to furx,-tioning property,missing rungs,has cracks specifications,and is sate to and/or misafigned_ use as determi�ed by inspection personnel. ' �� II �- 1998 Surfaoe Watu Dcsig�Manual 9/l/98 A-19 _ I APPENDlX A MAINIENANCL-STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FAC1LI77ES j I NO. 14- OIL CONTROL FACILITIES A.) OiU Water Separators Maintenance Defect Condition When Maintenance is Needed Results Expected When f--,, Component Maintenance is Performed. � �API Type OWS Mon�tonng Inspection of discharge water lor obvious signs Effl�ent discharge trom vauft ot poor water qual�ry. should be dear with oul thick vis�ble sheen. Sediment Accumulation Sediment depth in bottom of vauft exceeds 6- No sediment deposits on vautt ' inches in depth_ bottom whicfi would impede flow � through the vault and separation eificiency- Trash and Debris Trash and debris accumulation in vautt,a pipe Trash and debris rernoved from Accumulation in1eU outlet,floatables and non-floatables. vault,and in1eU artlet piqng. Oil AccumulaDon Oil accumulations that exceed t-inch,at the Extrad a!from vault by � suAace of the water vactoring_Disposal in i aocordar►ce with state and local rules and regulations. Damaged Pipes Inlet or outlet piping damaged or broken and in Pipe repaired or replaced. need of repair. Access Cover DamagedJ Cover cannot be opened,one person cannot Cover repaired to proper Not Working open the cover,corrosion/defortnatio�of oover. worf6ng spedfica8ons or replaced. Vauft Structure Damag� Cracks wider tt►an i!2-+nch and arry evidence of Vautt r�laced w repaired to Mdudes Cracks in Walls soil partides entering the struchire through fhe design specfications. � Bottom,Damage to cracks,or mainlenance/inspec�on personnel I Frame and/or Top Slab detertrsnes tt�at the vault is not stn�ctually sound_ Battles BafAes corrodng,cracking,warping and!or Repair or�eplace baffles to showing signs of failure as detertnined by specifica5ons. maintenance/irupection person. � Access Ladder Dartiaged Ladder is corroded a deteriorated,nat Ladder replaced or repaired and ��9 ProPe�Y•missing rungs,uacks,and meets specifiqtions.and is , misaligned. sffie to usz as detertr„ned by irupection persoru�el. Cradcs wider tt�an 121ncti at the joi�ot any No crad�more tlian 1/4inch inleV outlet pipe or arry evidence of sol partides wide at the joint d 0►e in1eY entering the vault through�e waps_ outlet pipe. CPS-Type OWS Monitoring Inspection o!d�scharge water for obvious signs EHluent dsd�arge from vaul[ of poor water quaGty. should be dear wilh no thick visible sheen. Sedttnent Acwmutation Sedimerrt depth in bottom of va�t exceeds 6- iVo sedmer►t deposits on vauR indies in depth and/or visble signs of sedment bottom and plate med�which on plates. watld irnpecle flow ttxagh the vault and separation effidenc,y- Trash and Debris TrasA and debris accumulated in vautt,or pipe Trash and debris rertaved from Ac�,cumulation inleV outfet,floarables and norrfloatables. vauft.and'mlet/outlet P�P�9• Oi1 Accumulati�n Oil acwrtx�abon that exceeds 1-ind�at the Extrad oil from vault by water surface_ vacioring methods.qean ��9 Pla�es bY Cioio�9►�Y �nsing and flus�ng.Should be no vis�-ble al depth on water. 91�8 1998 Surface Water Dcsign Manual A-20 APPENDIX A MAIIv'�NANCE STA�(DARDS FOR PRIVATFI.Y MAIt1TAlNED DRAINAGE FACIL[71ES NO. 14- OIL CONTROL FACfUl1ES(CONTINUED� A_) OiV Water Separators(Continued) __ aintenance Defect Condition When Maintenance is Needed Results Expected WAen �mponent Maintenance is Perlormed Damaged Coalesci�g Plate media broken,detormed,cracked and/or Replace that portion of inedia Plates showing signs ot failure. padc or entire plate pack depending on severity of falure. Damaged Pipes lnlet or outlet piping damaged or trroken and in need Pipe repaired and or replaced. of repair_ Battles Baifles corroding,cracking,warping andl or showing Repair or replace baffles to signs ot failure as determined by mairnenancel specifications. inspection person. Vault Structure Cracks wider than 1/2-inch and any evidence of soil Vautt replaced or repaired to Darnage-Includes partiGes entering the sVucture U�rough the cracks, design specifications. Cracks in WaJls, or ma;ntenance inspection perso�nel determines Bottom,Damage to that the vault is not stniduraly sound. Frame and/w Top Slab Aocess Ladder Ladder is oorroded or deteriorated,not fwictioning Ladder reptaced or repaired and Oama9� P��PQ�Y.+�ss+n9 rungs,cracl�s,and misafgned meets specifications,and is safe to use as deterrruned by insPection Personne�- Cracks wider than 1/2-inch at the joint of any inteU No cracks more than 1/4-irich ouUet pipe w arry evidence of soil parEGes enterirg wide at the joint ot the in1eU the rault ttuough the wa(ts. outlet pipe. Z. Catch Basin Inserts � -- . . ,��nienance Defeci Condrtions When Ma�ntenance�s Needed Results ed YVhen ponent Maintenan�c�e s Performed Catch Basin S�ment 1Nhen sedmeM tomLs a cap over the insert media of No sediment cap on the inse�i Acciuntdation the insert and/or unit rtieda and iYs unit Trash and Debris T�ash and debris acc�anulates on insert unit creating T�asfi and debris removed i�pm Accumulation a b{odcage/restriction. insert udL Runoff freely flows into catch basin. lnspection Inspection d me3a insert is required. Effluent vrater irom meda insert is free d ods ar�d has no visible sAeert Meda Insert-Wate� Catch basin inseR is saturated with water.which no Remave and repiace meda �aturated br►ger has the ca�acity to absorb_ inseit Meda Insert-Od Media al satuated due to petroteum spi'Jiai drains Rerrave and repface media Saturated irrto catch hasin. inserL General Regular interval repacement due to typical average Rertave and replace meda at lite af ined'ia insert produc� regular intervals.de�ng on insert product 1998 Surtace Wata Dcsign Manual 9/1/98 A-21