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o-eR’B(l.a°j10HJBJLTechnicalInformationReportPREPAREDFOR:RentonSchoolDistrict7812South124thStreetSeattle,WA98178PROJECT:RentonEarlyChildhoodLearningCenter1800IndexAvenueRenton,WashingtonKingCounty,Washington210515.10PREPAREDBY.DavidC.Nason,PECivilProjectManagerJenniferM.Kelly,PEProjectEngineerREWEWEDBY.DoreenS.Gavin,PE,LEEDAPPrincipalDA7EFebruary2012RevisedMay2012NOISINGONlGllflSZLOZ1gAvG3AI3D3bNOiNJUJOAIDCivilEngineersStructuralEngineersLandscapeArchitectsCommunityPlanners•NaturalResourceEcologists.LandSurveyorsNeighbors TechnicalInformationReportPREPAREDFOR:•‘:-3.N4/2..-sS5‘½RentonSchoolDistrict7812Southl24StreetSeattle,WA98178PROJECr:RentonEarlyChildhoodLearningCenter1800IndexAvenueRenton,WashingtonKingCounty,Washington210515.10PREPAREDBY:DavidC.Nason,PECivilProjectManagerJenniferM.Kelly,PEProjectEngineerREWEWEDBY:DoreenS.Gavin,PE,LEEDAPPrincipalDATE:February2012RevisedMay2012CITYOFRENTONRECEIVEDMAY2)2012IherebystatethatthisTechnicalInformationReportfortheRentonEarlychildhoodLearningcenterprojecthasbeenpreparedbymeorundermysupervision,andmeetsthestandardofcareandexpertisethatisusualandcustomaryinthiscommunityforprofessionalengineers.IunderstandthattheCityofRentondoesnotandwillnotassumeliabilityforthesufficiency,suitability,orperformanceofdrainagefacilitiespreparedbyme.BUILDINGDIViSION aaaa—aaaaaaaaaaaa TableofContents1.0ProjectOverview1-11.1PurposeandScope1-11.2ExistingConditions1-11.3Post-DevelopmentConditions1-11.4DrainageBasins1-11.5WetlandProtection1-1Section1.0FiguresFigure1-1TIRWorksheetFigure1-2SiteVicinityMapFigure1-3ExistingSiteMapFigure1-4DevelopedSiteMapFigure1-5CityofRentonSensitiveAreasFloodHazardMap2.0ConditionsandRequirementsSummary2-12.1CoreRequirements2-12.1.1C.R.#1—DischargeattheNaturalLocation2-12.1.2C.R.#2—DffsiteAnalysis2-12.1,3C.R.#3—FlowControl2-12.1.4C.R.#4—ConveyanceSystem2-12.1.5C.R.#5—ErosionandSedimentControl2-12.1.6C.R.#6—MaintenanceandOperations2-22.1.7C.R.#7—FinancialGuaranteesandLiability2-22.1.8C.R.#8—WaterQuality2-22.2SpecialRequirements2-22.2.1SR.#1—OtherAdoptedArea-SpecificRequirements2-22.2.2SR.#2—Floodplain/FloodwayDelineation2-22.2.3S.R.#3—FloodProtectionFacilities2-22.2.4S.R.#4—SourceControl2-22.2.5SR.#5—OilControl2-22.2.6S.R.#6—AquiferProtectionArea2-23.0OffsiteAnalysis3-13.1UpstreamAnalysis3-13.2DownstreamAnalysis3-1TechnicalInformationReportRentonEarlychildhoodLearningcenterDm0! ISection3.0FiguresIFigure3-1DownstreamAnalysis4.0FlowControlandWaterQualityFacilityAnalysisandDesign4-14.1FlowControl4-14.1.1ExistingSiteHydrology(PartA)4-1I4.1.2DevelopedSiteHydrology(PartB)4-14.1.3PerformanceStandards(PartC)4-1I4.1.4FlowControlSystem(PartD)4-14.2WaterQualitySystem(PartE)4-2ISection4.0FiguresFigure4-1ExistingBasinsMapIFigure4-2DevelopedBasinsMapFigure4-3AreaCalculationsFigure4-4InfiltrationRateCalculationsIFigure4-5InfiltrationDesignCalculationsFigure4-6WaterQualityCalculationsFigure4-7FrontageBypassCalculations5.0ConveyanceSystemAnalysisandDesign5-1Section5.0FiguresIFigure5-1ConveyanceandBackwaterCalculations6.0SpecialReportsandStudies6-1Section6.0FiguresFigure6-1SubsurfaceExploration,PreliminaryGeotechnicalEngineeringandInfiltrationReport.AssociatedEarthSciences,Inc.,November18,2010Figure6-2PreliminaryDesignInfiltrationRateTechnicalMemorandumAssociatedEarthSciences,Inc.,August15,2011Figure6-3SummaryofAdditionalBoringstoDelineateExistingFillAssociatedEarthSciences,Inc.,August17,20117.0OtherPermits7-18.0CSWPPPAnalysisandDesign8-1ISection8.0FiguresFigure8-1SedimentRetentionCalculationsRentonEadychUdhoodLearningcenteriiDODI 9.0BondQuantities,FacilitySummaries,andDeclarationofCovenant9-110.0OperationsandMaintenancePlan10-1Section10.0FiguresFigure10-1OperationsandMaintenanceManual11.0Conclusion11-1TechnicalInformationReportRentonEarlychildhoodLearningcenter0W0! I1.0PROJECTOVERVIEWI1.1PurposeandScopeThisreportaccompaniestherevisedcivilengineeringplansanddocumentsfortheRentonSchoolDistrict’sEarlyChildhoodLearningCenter(ECLC)locatedat1800IndexAvenue,onParcels722780-0135and722780-0155inthecityofRenton,KingCounty,Washington.ITheparcelproposedtobedevelopedisapproximately7.46acresinsize.ThisparcelisaportionoftheSouthwestQuarterofSection4,Township22North,Range5East,oftheWillametteMeridian.SeeFigure1-1foraSiteVicinityMap.TheprojectproposestoconstructanewbuildingtohousetheECLC,demolishtheexistingstructure,andimprovethesiteandsiteinfrastructure.StormwatermanagementistocomplyIwiththe2009KingCountySurfaceWaterDes,inf’fanual(KCSWDM)andCityofRentonAmendments.1.2ExistingConditionsIThesiteiscurrentlyoccupiedbytheHillcrestSchool.Theexistingone-storystructureislocatedinthecenterofthesite.AparkinglotislocatedonthewestsideofthesiteandparallelsIndexAvenue.Thereisacoveredplayareaontheeastsideofthesite,pavedandgrassplayareas,aswellasafewportableclassrooms.Thesitegenerallyslopesdownfromthenortheastcornertothesouthwestcorner.AccordingtotheGeotechnicalReport,completedbyAssociatedEarthSciences,Inc.,thesiteconsistsofVashonLodgementTilloverVashonAdvancedDutwash.ISeeFigure1-2—SiteVicinityMap,andFigure1-3—ExistingSiteMap.1.3Post-DevelopmentConditionsITheprojectproposestoconstructanewclassroombuildinganddemolishtheexistingstructure.Thesiteimprovementswillalsoincludenewparkingandbusdropoffareas,outdoorplayareas,andutilities.Theproposeddevelopedsite,includinggradinganddrainageamenities,canbeviewedontheDevelopedSiteMap,Figure1-4.1.4DrainageBasinsThesiteislocatedintheMayCreekBasin.AsdiscussedintheDownstreamAnalysis,theCityofRentonSurfaceWaterMapincorrectlyshowsthesiteintheJohn’sCreekBasin.1.5WetlandProtectionTherearenoknownwetlandsonorinthevicinityofthesite.IITechnicalInformationReportRentonEarlychildhoodLearningcenteri-iDOD! Section1.0FiguresFigure1-1TIRWorksheetFigure1-2SiteVicinityMapFigure1-3ExistingSiteMapFigure1-4DevelopedSiteMapFigure1-5CityofRentonSensitiveAreasFloodHazardMapTechnicalInformationReportRentonEarlychildhoodLearningcenterDOD! FLUwCI—IKINGCOUNTYWASHINGTON.SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETProjectOwnerSC\toL.i9flairPart3WPEOFPERMITAPPLICATIONULanduseServicesSubdivison/ShortSubd,/UPDUBuildingServicesM/F/Commerical/SFRUClearingandGradingURight-of-WayUseOtherSPR*CUPTechnicalInformationReportTypeofDrainageReviewTargeted/(circle):LargeSiteDate(includerevision12—dates):05/al/12DateofFinal:Part1PROJECTOWNERANDPROJECTENGINEERPhone(q2_o4l’?,ooAddress3oo5V.J7+kSTacEmgeiq-lvM,WAProjectEngineerCompanyDhVIDI’JPvSciJLPEPhone(2-67)3G_2Ln-zPart2PROJECTLOCATIONANDDESCRIPTIONProjectNameRclviti’JacLcDDESPermit#NJ/ALocationTownship2—3NtRangeCSectionHSiteAddressI’SooINDrVflJLjlPart4OTHERREViEWSANDPERMITSUDFWHPAUShorelineUCOE404ManagementUDOEDamSafetyUStructuralRockeryWaulu______UFEMAFloodplainESASection7UCOEWetlandsIOtherThb:BIAILDIF4éINPDIIIIIIIIIEs,IIIIIIIPart5PLANANDREPORTINFORMATIONSiteImprovementPlan(Engr.Plans)Type(circleone):FullIModifiedImallSiteDate(includerevisionC7.40(c)I2.dates):c€,JaI/laDateofFinal:PartSADJUSTMENTAPPROVALS...•Type(circleone):Standard/Complex/Preapplication/Experimental/BlanketDescription:(includeconditionsinTIRSection2)N/ADateofApproval:2009SurfaceWaterDesignManual1/9/2009 KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart7MONITORINGREQUIREMENTSMonitoringRequired:YesINoDescribe:StartDate:CompletionDate:Part8SITECOMMUNITYANDDRAINAGEBASINCommunityPlan:SRWS€yMPrS1g-PLAt.JSpecialDistrictOverlays:DrainageBasin:.M4kYce-—StormwaterRequirements:2-CD’?ktSVVDM4REN1tNJAMENDMEI’JTSPad9PNSITEANDADJACENTSENSITIVEAREAS- , -URiver/StreamUSteepSlopeULakeUErosionHazardUWetlandsULandslideHazardUClosedDepressionUCoalMineHazardUFloodplainUSeismicHazardUOtherN/AUHabitatProtectionUWPart10SOILSaS%wSoilTypeSlopesErosionPotentialVASk-4PNLo!X&rncPjT-flLU--‘M,cfleCb—MA-YCIVAS\tiJ_ADVA-NcCboucrWnS4pRoPeRtyLAMLThUHighGroundwaterTable(within5feet)USoleSourceAquiferOtherFiLU)$JNVM\4PUgrnbbjUSeeps/Springstps1Th_UAdditionalSheetsAttached2009SurfaceWaterDesignManual21/9/2009 KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETIIIIIIIIIIIIIIIIPart11DRAINAGEDESIGNIREFERENCELIMITATION/SITECONSTRAINTUCore2—OffsiteAnalysisUSensitive/CriticalAreasUSEPAUOtherUAdditionalSheetsAttached—-—-—---———---S—-Part12TIRSUMMARYSHEET(provideoneThresholdDischargeArea:(nameordescription)CoreRequirements(all8apply)DischargeatNaturalLocationNumberofNaturalDischargeLocations:.rj.OffsiteAnalysisLevel:(j/2/3dated:ce/fo/FlowControlLevel:1/2/3orExemptionNumber(mdfacilitysummarysheet)SmallSiteBMPsConveyanceSystemSpillcontainmentlocatedat:C-SSu,A-kPSErosionandSedimentControlESCSiteSupervisor:ContactPhone:AfterHoursPhonçi..MaintenanceandOperationResponsibility.(Privatata/PublicIfPrivate,MaintenanceLogRequired:/NoFinancialGuaranteesandProvided:Yes/NoLiabilityWaterQualityType:(cISens.Lake/EnhancedBasicm/Bog(includefacilitysummarysheet)orExemptionNo.LandscapeManagementPlan:Yes/NoSpecialRequirements(asapplicable)AreaSpecificDrainageType:CDA/SDO/MDP/BP/LMP/SharedFac.(Noj)RequirementsName:Floodplain/FloodwayDelineationType:Major/Minor/Exemption/)100-yearBaseFloodElevation(orrange):Datum:FloodProtectionFacilitiesDescribe:SourceControlDescribelanduse:SC-t4WDLeTIapstiMN€ptyr(comm/industriallanduse)Describeanystructuralcontrols:CDPPI.IWNSQDL-tfl2009SurfaceWaterDesignManual31/9/2009 KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETOilControlHigh-useSite.YesTreatmentBMP:MaintenanceAgreement:YesINowithwhom?OtherDrainageStructuresDescribePart13EROSIONANDSEDIMENTCONTROLREQUIREMEN1”.*MINIMUMESCREQUIREMENTSMINIMUMESCREQUIREMENTSDURINGCONSTRUCTIONAFTERCONSTRUCTIDNClearingLimitsStabilizeExposedSurfacesCoverMeasuresRemoveandRestoreTemporaryESCFacilitiesPerimeterProtectionCleanandRemoveAllSiltandDebris,EnsureTrafficAreaStabilizationOperationofPermanentFacilitiesSedimentRetentionUFlagLimitsofSAOandopenspacepreservationareasSurfaceWaterCollectionOtherLIDewateringControlDustControlFlowControl—Part14STORMWATERFACILIWDESCRIPTIONS(Nate:IncludeFacilitySummaryAndSketch)FlowControlType/Description—WaterQuality[Type/DescriptionUDetentionUBiofiltrationInfiltrationNLAflt’NUWetpoolWeJCHESURegionalFacilityUMediaFiltrationUSharedFacilityUOilControlUFlowControlUSpillControlBMPsUFlowControlBMPsUOtherOtherpa-iNGm,2-puN52009SurfaceWaterDesignManual1/9/20094 KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETIIPart15EASEMENTS/TRACTS[Part16STRUCTURALANALYSIS‘UDrainageEasementUCastinPlaceVaultUCovenantURetainingWailUNativeGrowthProtectionCovenantURockery>4’HighUTractUStructuralonSteepSlopeUOtherUOtherPart17SIGNATUREOFPROFESSIONALENGINEERI,oracivilengineerundermysupervision,havevisitedthesite.ActualsiteconditionsasobservedwereincorporatedintothisworksheetandtheattachedTechnicalInforniationReport.Tothebestofmyhereisaccurate.Signed/DateIIIIIIIIIIIIII2009SurfaceWaterDesignManualS1/9/2009 /•0RentonSchoolDistrictEarlyChildhoodLearningCenterVicinityMap01inch=100feetP1,4C-SCI.1- aaaaaaaaaaaaaaaaaaa O-OdOJ.IrrCmCDHmrCIrCI00CCmzm11iip0x0rnz0z0I00rC0,0íaShVaK,vo3‘,YU%&___000.9no0I‘‘2—2,t€wb4h4V4?t/N-7-o%%;‘5]r-(Ir\CSo.1VIN\\0I‘C‘-7//—‘\‘I—\41:—_\\\\\I—!\‘,_]_——/IN\/://c\øPL/‘o\0 -AiH•11NNN...t———°—.jNNOISNIHSYMAlNflQjONIMMacbNEZLCNOUD3SdoNOIIUOdVpll***zz7\:Ni/Iii crLuIzLu0UC0IUJI0JLuIC),Lu0JJISCALE-Sn;•tIII!ifi1II.oa.C0—’i—Ce.—•nflS1a13 NN\4N\N\N_—N‘-..c.,CCC-OdOi2z3[3,-.1ThasIrr0m(I,-1mI00C0mz-1rnI,4Inzaz0I00rCCora-II,,II!!-sfloop.•,sSNa-zii:QjIiIii—-i‘U—I—0tip_b,.—NN2-‘NN/‘pN-[P-—/NOIDNIHEYMA.lNflOOONJ>4-y(M35Uj£ZItNOIIO3SdoNOIWOdV 2Wa2zLU-JC00IC-3I0>--JLUTHEEAISDNCCILTURALAIDTORTHORAPAOEDMA040*9011THESEORAKNSSHASBENPREPARE,INPART.BASEDUPORIINFORBATORFURNISHEDBYOTHERSWILETHISINFORUATIORISJCA€XTOSERWADIE.MELCMINOTENSUREACOURACYMIDTHUSISNODEROISBIlFORTHEACOJRACYOFTHATHFORAATOKORFORMIT’ERRORSOR09150015*9104BAYHAWBECKINCORPORATEDAlTOTHESEDRAWINGSASARESOLT,TRENCHNOTEIFWKERSENTERHAlFTRENCHOROTHEREXCAVATIONFOURORMOREPETINDEPTHTHATDORSNOTBETTHEO’01PITREOJIREMOATSOF*0901SECTON2-093)3.ITSHAlLBESHOREMADORBOD.THECEATRACTORAURASHALLBERESP01ASTLEFORWORKERSAUlANDAHBLASOJUESNDRESPQISBUTV.AUTREMOR915THSYSTEMS54*11BEETTHERCOJIROJENTSOFTHEWASHINCTOAINDUSTRIALSAFETYMIDHEALTHACT,CHARTER4917ROWCHAPTER49.17RCW.FILLSPECIFICATIONPILLMATCIRALSHALLNOTCOITAINPUROREAMPRORUCTS,OROJESTANTESMACHAREHAZARDOUS.DANGEROUS.TOXC,ORBIRCHOTHERWISEAIPLATEANYSTATE.FEDERALORLOCALLAAI01XNAIICit.REGULATOR,RULE.ORDER.ORSTMAOMICUTILITYNOTETHELOCATORSOFEAISTNOUHIDEREROUNDUTUTESAREAPPROAUATE01111MIDHARENOTTWARIDERENDENTLYNERPIEDBYTHE04*401ORITSR0’RESERTATIW,THECOUTTACYORSlAt!DETERMINETHEEAACTLDCATIOROFAU.EXISTINGUTYJOESBEFORECOAWENONCWORKANDAOREESTOBEFULLYRESECKASBLEFORMAYANDAUDAMAGESTHATINCURORETXTHECONTRACTOR’SFAILURETOLOCATEEXACTLYMIDPREWANYMIDAUANCEROAOUNDUTUJIES.AIDEASSJMESNDUAAOUWFORTHELEEATOROFUNDERGROUNDUTIURES.UHr1=_-LEGALDESCRIPTIONSPARCELI.TRACTA,010095,REAlTORHISILMITSNO.2,CORRECTEPLATRECORDEDIVTaTtlE57OFPUTS,PAGES93TORB,INC.USAE.RECORDSOFKINGCOUNTY.WASINCTOR,LESSTHATP0100KLANGEASTERLYOFAUNEBEONNINCATTHENORTHWESTCORNEROFTRACTBOFSADPUT:THOICENORTH044109CASTTOTHENORTHERLYLOREOFTRACTA.PCII:TRACTC,BL0005,ROATORAHIDALMIDSND.2.CORRECTEDPLATRECORDEDHRO.UME57OFPUTS.PATES92TO98.INa.USAE,RECORDSOFKINGCOUNTY,WASHNDTTI4.LESSTHATPURTONLANGEASTERLYOFALINEWDNKNGATTHENORTRAESTCORNEROFTRACTOFSADPUT;THENCENORTHD4’41’09LASTTOTHENORTHERLYUNEOFTRACTC,APK;722700—0115—03APN:732700—0155—01VERTICALDATUMRHOCOUNTYCONTROL.VAX83/91PAOSCTISREFETENCEETOTHEFOIOWINCDESCRIBEDaCT’OFRElATOR009190.MORUWENTS:j3K9NT89O92.033E-1309215.307EL.332.57IS?NT00452.905E—130919C.39KEL.32D.41SITEADDRESSflINTERAWNUENERElATOR.WA98056OWNERRENTORSCHflDSTRICT309SW7(8STREETRElATOR.WA.98057PH.425)204—2340CONTACT:RICKSTRACKE,ESEWTHEDIRECTOR,FOREOWNER’SCONSULTANTGREENGASAKAYMID4ITCCTS,PILE3T62D23rdAVENUESOUTHFEDERALWAY,WA9fl3PH:253)941-4937CONTACT:CALMNGASAWAY.PBNINABMAUAL,PROLCTASSSTMITARCHITECTXLRBAROHITECTS,P.S.259PAORCARESAllE709TACOMA,WA99402PH,(253)027—1599FAA)253)572-5*7CONTACT:000GEASDUOHARME.P.M.ANDYCOURIWPATHORASBATES.F,LIA,LANDSCAPEARCHITECTTHERIASPENCSTORFASSOCIATES911WESTERNAVENUE,SUITE202SEATTLE.WA.99104PH:(209)082—7003CGRITACY:TORROAESTOUF.FRINOPLELORRAINEPA,LANDSCAPEARCHITECTSTRUCTURALENGINEERPESSTRUCTURALflUTIONSPACYCPLAZA250PASPICAVENUE.SUITE7D1TACORA,WA.99402PH:(253)383-2797FAR:(251)383—T557CONTACT:BRETTMADDOX,SCASSOCATEMECHANICALENGINEERDEEENONERS60211219STREETEAST,WITC290PIPE.NA.99424PH:(233)922—0446EORTACT:0995CASTE,P.l.C.—MEOAMIICALEASIERLIEHARDWIO4E,MECHANICALDESDAER/I/1/7CIVILENGINEERMIBLDICINEERS.PLANNERS.&SURVEYORS2215NORTh3009STREET.SHITC309TACORA,WA99403PA:)353)393-2422FAX:(253)393—2572CONTACT:DAMENASCHA,P-B,DOREENGARIN,P.E..PIE,AUTOCADFILEMAAUTOCADORAWINCPILEISAVAILABLEToAS9STHTNSTEUYOJTPLEASENOWTHATELECTRORICFTLESAREPROMFORCONTRACTOR’SCONVENIENCEANDSHALLNOTREPLACENORBEUSEDTOSUBSTTUTETHECONTRACT000JMENTS.THECONTRACTORISREPCHASBLEFORPRO.(CTLAYOUTACCORDINGTXCONTRACTD009BENTSANDEXSTFORELECTRONICAUTCOADPILES,PAORE:(253)383—2422FAA(253)383—2572CONTACT.DAVENASOR,P,E.CONIFEROUSTREEDEODJOASTREEPOTELEVATION/—RBFLOWUNE/FG—FRAISHEDGRADE“TTW-TOROFWAIL4’I9—2012co.oo_saU)En000—r2IICArc’uI.n-I:I:LAPORTIONOFSEC.4,TWP.23N9RiW.M9KINGCOUNTYWASHINGTONSWAREA1SEESHEETSCDI.OI,Ctll,Ct21,Clii,Ct41nIa.——SHEETINDEXSHEETDESCRIPTON00.09CORERSHEETOUT,DTDEMOUTONP1*—SWAREAI09002DEBTTJTONP1*—NWAREA209103DEUOJTO4PL*-SEAREA3CDI,OKDEMOlITIONPLAN—NEAREA4CIIIWSCPLM—SWARCATCOIlTCSCPLAN—NWAREA2CIIITEEPLAN-SEAREA3CNIMTESCPLAN—NEAREA4COIlGRADINGPLAN—SWMICAI01,22GRADINGPLAN—NWAREA2GRADINGPLAN—SEAREA3COIN01*0KGPLAN—NEAREA4CIIICIIS01*0*40PLAN-INDOORSPLAYGROUNDPAMNOANDHORIZONTALCONTRaPLAN—SWAREAI01,34CI,31PAMNGANDHORIZONTALCOMPEl.PLAN—NAAREA3CIIIPAMNCMIDHORIZONTALCONTR0.PLAN—SEAREA3rIIIIIr/t:f.li7227000145CITY-OPRENTON-‘3009NE180thSTREET4rIJ‘ER!CA’ITt-arDY..W,’501—TOPOGRAPHICNOTEVICINITYMAPNOTTOSCAlEPAMNDMIDHDDZONTALCONTRa.PLAN—NEAREA4LEGENDPARCEL7227000140IRENTONHOUSINGAUTHORITYI1430HILLCRESTLANE--‘WaCI4TSTORBDRAINAGEPUN—SWAREAI0042STORMDRAINAGEPUN—NWANEA2CT43STORUDRAINAGEPUN—SEAREA3ClAMSTORMDRAINAGEPUN-WEAREA4CT4SSTORMDRAINAGEPRURLESE140STORMDRAINAGEPRORTLESCI47STORMORAINAGEPROOLESC140STORMDRAINAGEPRORLES0151WATERPI.MAMADPROFILECr52WATERPLANMIDPROFILECL53WATERPLANMIDPROFILECr54WATERPLANANDPROFILECr55WATERRANMIDPRORTLEEISAWATERPLANANDPROULECr61SANITARYSEWERPLARMIDPROPILECr02SMIITARYSEWERPLMAANDPROPILECIIIOFESTEIMPROASNENTSPUNANDPRORLEC112OFFSTCIURROAEAENTSPLANANDPROFiLECr3OFYSTEIWPROWJAENTSPLANANTPROFTEE0214OFFSTCIWPROAEAENTSPUNANDPRORTLECVSOFFSTCIAPROAZA*ENTSPLANANDPROULEEI2TOFFSTEWATERPLANMIDPROYLE0122OFFOTEWATERREARANDPRDTLEC9,TAWSCDETAILS09,18TESCDETAILSEA,CAPAMNEDETAILSCOlDPARINGDETAILSC&3ASTORMDRAINAGEDETAILSCBAASANITARYSEWERANDWATERDETAILS0840SANITARYSEWERANDWATERDETAILSCISA0910WIMPROWNENTSDETAILSC9,SOFFSICIBPRDAOAENISDETAILSIPROPOSE.AHS—ELEV—C,E-tACUI—x—09——W——55——RD—EOSTOICDESERPTORAYUDAT‘,PDWER/TELEPat—-OURWIRETELEPHONEMH9TELEPHORERISERLVAULTC’iCATCHBASNSTORMDRAINMA3SANITARHSEWERMASONF”HYDRANTPOREDEPTCONNECTORN:WATERHALVEIT’WATERMETERCHANUNKFENCEUCERGROUNDPOWER—Uii’.GONTOURSON-STECURINGUAITSPUTRAILFENCECAANLAANFENCE—A--—-————STORMDRAINlINE——WATERUNE——I——SANITARYSEWERLINEROOFDRAINLINE—C———GASLIKE——P——POWER01OVERNEADPOWER——I——EDISTNGTELEPAORE——F——flIERRETAININGWALLUTILITIESI----II__________CEMENTCONCRETEH:i’“-WATER:CITYOFRO4TORSEWER:CITYOFRENTONPARCELNO.7227800135&0055TUEPHOIE:OWESTHA:T-030-244-ITIIPOWER.PUGETSOUNDENERGYPH:1—999—321—7779GAS.PAGESSOUNDENERGYPH:l-599-321-7779COVE0*131-809-424-5555NOHREVISIONEPA-—--.——z—__rnmtftiNAICTACOMA‘SEATTLEI5NatION08069Sd.301,Tsna,WA06403Tt1201SORtAnra,Sd.1620,Soflo,WA1640411.CTYOFRENTONPIDnnIYg/SuiIding/PUXIICWorksbopt.EARLYCHILDHOODLEARNINGCENTERRENTONSCHOOLDISTRICTCOVERSHEETF1&LaJ.—L4PEVELDrflS1TM,4PIAI-INININNIA4 PublicWorksDepartment0Zimmerman,AdministratorTechnicalServicesR.MacOnie,DVisneskiPrintedonMay21,20D9FI6QtE15CityofRentonSensitiveAreasDataSm.rcrPubhcWoriss,Ut,Iit,,sSystems.TecCnicalServicesFloodHazarda4.‘5I’.aWr,’‘-‘:———.II5”•—‘1——z.t)ttir‘5••1ti”:-.I-—-L‘1-1iiIiI.:IiA.—IS.•1‘INF,I‘.‘-—a/vi-‘5£II5’aS‘5IlliiLII/_•Ii4I\CffII.3‘I.‘Ia4—-aI—...SVAXsite’HazardConditionCriticalInfrastructureFloodHazardPoliceDepartmentFireSIaons\/½lleyMedicalCenter I2.0CONDITIONSANDREQUIREMENTSSUMMARYTheproposedprojecttriggersFullDrainageReviewandmustmeetCoreRequirements1through10.BelowisasummaryonhowtheproposedprojectwillmeettherequiredCoreRequirements:2.1CoreRequirements2.1.1C.R.#1—DischargeattheNaturalLocationCurrently,thesiteslopesdowntothesouthwestcornerofthesite.SurfacerunoffismainlycollectedbyaconventionalstormcollectionsystemthatoutletstothecitystormsysteminNE16thStreet.Theproposedprojectwillinfiltratedevelopedconditionsrunoff.2.1.2Cit#2—OffsiteAnalysisAHBLstaffperformedaLevelOneDownstreamAnalysisfortheproject.Theanalysisincluded:•Definingandmappingthestudyarea.•Reviewingavailableinformationonthestudyarea.•Fieldinspectingthestudyarea.•Analyzingtheexistingdrainagesystem,includingitsexistingandpredictedproblems,ifany.PleaserefertoSection3.0[orthefulloffsiteanalysis.2.1.3C.R.#3—FlowControlPertheCityofRenton2009SWDMAmendmentReference11-AFlowControlApplicationMap,thesiteissubjecttotheFlowControlDurationStandard(ForestedConditions).Flowcontrolwillbeprovidedthroughtheuseoffullinfiltrationintheformofinfiltrationtrenches.Siterunoffwillbeentirelyinfiltratedonsiteininfiltrationtrenches.2.1.4C.R.#4—ConveyanceSystemTheimprovementswillincludeatraditionalstormconveyancesystemtocollectandconveystormwatertothestormwatertreatmentandinfiltrationfacilities.ThecollectionsystemwillmeettherequirementsoftheCityofRentondrainagecode.Proposedconveyancesystemswereanalyzedinaccordancewiththe2009KCSWDMforthe25-yeardesignpeakdischarge.2.1.5CR.#5—ErosionandSedimentControlTheprojectwillconstruct,accordingtocurrentstandards,aseriesofsedimentcontrolstoaddressthespecificconditionsatthesite.ADepartmentofEcologyGeneralPermittoDischargeStormwaterAssociatedwithConstructionActivitywillbeobtained.AnErosionandSedimentControlPlanandaStormwaterPollutionPreventionPlanwereprepared.RentonEarlyChfldhoodLearningCenter2-1000 2.1.6C.R.#6—MaintenanceandOperationsTheonsitedrainagefacilitieswillbepubliclymaintainedbytheRentonSchoolDistrict.TheFinalTechnicalInformationReport(TIR)willcontainanoperationsandmaintenancemanual.2.1.7C.R.#7—FinancialGuaranteesandLiabilityThisprojectwillprovidethefinancialguaranteesasrequiredbytheCityofRenton.2.1.8C.R.#8—WaterQualityThenewpollutiongeneratingimpervioussurfacesfortheproposedsiteincludethepavedparkinglotonthewestsideofthesiteandthebusloopsonthenorthandsouthsidesofthesite.OnsiteflowswillbetreatedtomeettheperformancestandardoftheBasicWaterQualityMenubyutilizingraingardens.SeethewaterqualitycalculationsandanalysisinSection4.0ofthishR.2.2SpecialRequirements2.2.1SR.#1—OtherAdoptedArea-SpecificRequirementsTheprojectisincludedintheSunsetMasterPlanarea.2.2.2SR.#2—Floodplain/FloodwayDelineationThesiteisnotlocatedinafloodplain.2.2.3SR.#3—FloodProtectionFacilitiesTheprojectdoesnotcontain,willnotconstruct,andisnotadjacenttoanyexistingfloodprotectionfacilities.2.2.4S.R.#4—SourceControlThissitewillimplementwaterqualitysourcecontrolsasdeemednecessaryfortheexpectedsiteuseandfeatures.Minimalstructuralsourcecontrolsarerequiredduetotheanticipatedsiteactivities.Forexample,fueling,vehiclewashing,andstorageofmaterialswillnotoccuronthesite.Garbageandrecyclingcontainerswillbecovered.2.2.5S.R.#5—OilControlThesiteisnotconsideredahigh-usesite.2.2.6S.R.#6—AquiferProtectionAreaPertheCityofRenton2009SWDMAmendmentReference11-B,thesiteislocatedinAquiferProtectionAreaZone2.TechnicalInformationReportRentonEarlychildhoodLearningcenter2-2000! ITheproposedprojectmustcomplywiththefollowingrequirements:Ia.Openfacilitiessuchasflowcontrolandwaterqualitytreatmentponds,stormwaterwetlandsandinfiltrationfacilitiesmayrequirealinerinaccordancewiththedesigncriteriainSection6.2.4.PertheCityofRenton2009SWDMAmendmentSection6.2.4,nolinerisneededforaraingarden.Thissectiondoesnotmentioninfiltrationtrenches;thecorrespondingsectioninthe2009KCSWDMalsodoesnotmentioninfiltrationtrenches.Nofacilitylinersarerequiredforthisproject.b.OpenconveyancesystemssuchasditchesandchannelsmayrequirealinerinaccordancewithSection1.2.4.3.PertheCityofRenton2009SWDMAmendmentSection1.2.4.3:“AnyreachofInewditchorchannelproposedbyaprojectinwhichtheuntreatedrunofffrom5,000squarefeetormoreofpollution-generatingimpervioussurfacecomesintodirectcontactwithanoutwashsoilmustbefinedwitheitheralowpermeabilityfineroratreatmentfiner.”Thisprojectproposesareachofditchthatcollectsrunofffrompen’ioussurfaceonly;therefore,afinerisnotrequired.IIIIIIIRentonEarlyCMdhoDdLearningcenter23000II 3.0OFFSITEANALYSIS3.1UpstreamAnalysisTheproposedsiteisborderedtothenorthbyHarringtonAvenue,tothewestbyIndexAvenue,andtothesouthbyNEl6Street.Runofffromtheserights-of-wayisconveyedbythestreetcurbandgutterstocitystormcatchbasins.Norunofffromtheadjacentrights-of-wayentersthesite.Thesiteisborderedtotheeastbytwodevelopedsites.RunofffromthesesitesdoesnotflowontotheECLCsite,Therefore,therearenooffsiteareasthatdrainontothesiteandthatneedtobeaddressed.3.2DownstreamAnalysisThesiteslopestothesouthwestcornerofthesite.Existingsitedrainageelements,catchbasins/fieldunderdrainsoutlettothestormsysteminNEl6’Street.Thefollowingsummarizestheresultsofourdownstreamanalysis,performedtosatisfyCoreRequirement#2ofthe2009KCSWDMasAmendedbythe2010CityofRentonSurfaceWaterDesignManualAmendment.Thesurveyconfirmedtherouteofthedownstreamstormconveyancesystemanddrainagebasintheprojectsiteislocatedwithin.TheCityofRenton’sCoreRequirement#2requirementsareasfollows:1.DefineandmaptheStudyArea.2.ReviewallavailableinformationintheStudyArea.3.FieldinspecttheStudyArea.4.Describethedrainagesystem.Tasks1and2werecompletedpriortoasiteinspection.Theproposedprojectsitewassurveyed,andGISmappingfromtheCity’swebsitewasobtained.Inadditiontothesitesurvey,theavailableinformationforthesiteincluded:ExistingSiteAs-BuiltDrawings,GISMapping,DesignDrawingsfortheMcKnightMiddleSchool,andtheSunsetAreaSurfaceWaterMasterPlan.AmeetingwasheldwiththeCityofRentontodiscusstheproject.TheCitycommentedthattherewassomedoubtastotheaccuracyoftheCity’sGISinformationforthesite’sdownstream.Task3,thefieldinspection,wascompletedonJuly18,2011.Inadditiontotheinspectionofthedownstream,thedownstreamconveyancesystemwassurveyed.Theresultsoftheinspectionareincludedinthefiguresofthissection.Insummary,theresearchandfieldinspectionfoundthefollowing:1.Thestormwaterfromthesiteisconveyedtothesouthwestina12-inchstormdrainsystemalongNE15thStreet.AttheintersectionofNE16thStreetandEdmondsAvenueNE,thestormconveyancesystemconveysthestormwaternorthalongEdmondsAvenueNEinan18-inchstormdrain.2.TheschoolsiteislocatedwithintheMayCreekbasin.TheCityofRentonSurfaceWaterMapincorrectlyshowsthesiteintheJohnsCreekBasin.3.Uponasitevisitandvisualinspectionofthedownstreamcorridorandassociatedstormconveyanceinfrastructure,thestormsystemappearstobeinawell-maintainedcondition.Therewerenoobservedsignsofovertopping,buildupofsediment,orerosion.TechnicalInformationReportRentonEarlychildhoodLearningcenter3-121051510 ISection3.0FiguresIIFigure3-1DownstreamAnalysisIIIIIIIIIIIIICenter00!I PIbLARt?E1—-HL1-Hrt* dIIjId/IIIIIIIIIIIIIIIaI1I‘7nc1- ((DRAINAGEBASINSCH2MHILLFIgure1CityofRentonSunsetAreaMasterDrainagePlan 1s.iiCl•9tc—Hls2.ql%ct.tt0343__rrnztqmLcnSNACt,0341.4•cS. pV\\\\b7SC43S2-ISN“VS7AG---a---3JpcnrA (IWflIIIIIIIIIIIIIIII (-71)ra II.1IS.IIi1f—IIIIIIIIIIIIIeoFeI‘II.\ 4.0FLOWCONTROLANDWATERQUAUWFACILITYANALYSISANDDESIGN4.1FlowControl4.1.1ExistingSiteHydrology(PartA)Sincethesite’srunoffisbeingcompletelyinfiltrated,anexistingsitehydrologyanalysisisnotapplicable.SeeFigure4-1foranExistingBasinsMap.4.1.2DevelopedSiteHydrology(PadB)Theprojectproposestoconstructraingardenstotreattherunofffrompollutiongeneratingsurfacesandinfiltrationtrenchestoinfiltratetheentiresite’srunoff.Thesitewillconsistof32percentlandscaped(pervious)areas,and68percentpavedparking,sidewalk,andbuilding(impervious)areas.Thetotalsiteareais7.723acres,with5.286acresofeffectiveimperviousareaand2.437acresofperviousarea.Inaddition,theoffsiteplaygroundtotals0.799acre,andweareassumingitwillbe80percentimpervious.SeeFigure4-2foraDevelopedBasinsMap.4.1.3PerformanceStandards(PartC)PertheCityofRenton2009SWOMAmendmentReference11-AFlowControlApplicationMap,thesiteissubjecttotheFlowControlDurationStandard(ForestedConditions).Theproposedtrenchinfiltrationsystemswillinfiltrateallstormwaterrunofffromthesite,exceedingtheFlowControlstandards.Theonsitestormwaterconveyancesystemhasbeensizedtoadequatelyconveythefullydeveloped,25-yearstormevents,asstipulatedbyCityofRentondrainagecode.Inaccordancewiththe2009KCSWDMandCityofRentonAmendments,onsiteflowsfromthepollutiongeneratingimpervioussurfaces(PGIS)willbetreatedtomeettheperformancestandardsfortheBasicWaterQualityMenu.TheproposedraingardenswillexceedtheperformancestandardsoftheBasicWaterQualityMenu.4.1.4FlowControlSystem(PadD)Theproposedstormwaterflowcontrolsystemisdesignedtomeettherequirementsofthe2009KCSWDMtogetherwithCityofRentonAmendments.FlowcontrolwillbeprovidedthroughtheuseofaBMP:fullinfiltrationisproposedintheformofinfiltrationtrenches.Siterunoffwillbeentirelyinfiltratedonsiteininfiltrationtrenches(refertoFigures4-3and4-5).TheKingCountyRunoffTimeSeries(KCRTS)wasusedtosizetheinfiltrationtrenches.PerthegeotechnicalreportincludedinSection6.0ofthisTIR,outwashsoilsarelocatedbelowtillsoilsandthemeasuredinfiltrationrateoftheoutwashsoilsis28.8inchesperhour,Per2009KGWDMSection5.4.1,thedesigninfiltrationratecannotexceed20inchesperhour.Weused20inchesperhourtomodeltheinfiltrationtrenchesintheKCRTSmodel(verticalpermeabilityof3minutesperinch).Theinfiltrationtrencheshavebeendesignedtofullyinfiltratesiterunoff;therearenoflowcontrolstructures.Thefacilitiesarelocatedunderlandscapedareasandarenotbermedonanyside.Iftheinfiltrationcapacityofanytrenchisexceededorifthefacilityfails,theinfiltrationsystemoverflowoutletwilldischargetotheexistingstormsystemlocatedatthesouthwestcornerofthesite(thesite’snaturaldischargelocation).TechnicalInformationReportRentonEarlychildhoodLearningcenter4-1S21051510 IPertheCityofRenton2009SWDMAmendmentTable1.2.3.CFlowControlBMPFacilitySizingICredits,theFullInfiltrationBMPmeetstherequirementforflowcontrolBMPs.4.2WaterQualitySystem(PartE)IThenewpollutiongeneratingimpervioussurfacesfortheproposedsiteincludethepavedparkinglotonthewestsideofthesiteandthebusloopsonthenorthandsouthsidesofthesite.Asmentionedabove,onsiteflowswillbetreatedtospecificationsprovidedbytheBasicWaterQualitystandardsoftheCity’sdrainagecode,utilizingraingardens.SeethewaterqualityanalysisinFigure4-6.PertheCityofRenton2009SWDMAmendmentSection3.2,theWesternWashingtonHydrologyModel(WWHM)wasusedtosizetheraingardens.PerthegeotechnicalreportincludedinSection6.0ofthisTIR,outwashsoilsarelocatedbelowtillsoils.Weuseda2inchesperhourtillsoildesigninfiltrationratetomodeltheraingardensintheWWHMmodel,withaninfiltrationreductionfactorof1.ISeeFigure4-7foranalysisoftheFrontageBypassArea.IIIIIIIIIIITechnicalInformationReportchildhoodLearningcenter4-2000! Section4.0FiguresFigure4-1ExistingBasinsMapFigure4-2DevelopedBasinsMapFigure4-3AreaCalculationsFigure4-4InfiltrationRateCalculationsFigure4-5InfiltrationDesignCalculationsFigure4-6WaterQualityCalculationsFigure4-7FrontageBypassCalculationsTechnicalln(ormationReportRentonEarlychildhoodLearningcenter21051510 —————aa—aaaaa—aaaa ‘Sb’15133.2411‘t22267.24251_SOUTHBLDG)NORTHBLDG)NORTHBUSAREAMAINPARKINGLOTSOUTHBUSAREAFRONTAGEAREA16ThAVEAREAOFFSITEPLAYGROUND1.6591.8610.8381.3761.0740.9167.7230.3310.799N/IMPERViOUS(AC)-rPERVIOUSMAINc(Ac)PARKINGTOTAL(Ac)III0.3070.0230.1351.2080.9520.220SOUTHBUSAREALOT11.3521.8380.702D.1680.1220.69516TH2.8454.8780.2140.000Ii0.1170.799/GRAPHICSCALE0/35704%140FEET1”=70FEETNORTH/BUSAREASOUTHBLDG1/2I4-—INORTHOFFSITEPLAYGROUND4-4-4-4-4-4-4-BLDG1/2IIIb14-4-4-4-I‘I/.4/LEGENDI4-IELEWPATHII--4-4.6)B.LG1TLA6SNTACOMASEA722151vh301’Sfre&,Li,e300.TocLw—TWA96403Duflr’r‘1NIj.\cL..’.,210515.10 k.TOTAL(Ac)0.3310.799/IMPERVIOUS(Ac)cPERVIOUS(AC)SOUThBLDG)—NORThBLDG)NORThBUSAREAMAINPARKINGLOTSOUThBUSAREAFRONTAGEAREA—1.3780.2811.1110.7500.8180.2201.0820.2950.8070.2670.2910.6251.6591.8610.8381.3761.0740.9165.28616ThAVEAREAOFFSITEPLAYGROUND2.4370.1900.6397.7230,1410.160GRAPHICSCALE03570140FEET1”=70FEETSOUTHBLDG54A’1St(0•NORTHBLDG14IkoOFFSITEPLAYGROUND273•1a,1%J)‘SS.//LEGEND1‘.44.I‘FLDWPATHII—1’I’/--)tLITU-J.———E_____—--V.44,rnwràACO‘SIASEAT2?5tiM—Ath1tato,2H.3331L22TLE*Ag433RE\TONECLC2O5i5.1O 210515JMK4/13/2012SOUTHHALFOFBUILDING+SOUTHHALFOFFIRELANE-InfiltrationTrench#1FIGURE4-3AREACALCULATIONSPredev72,270sf1.659acImpervious13,375sf0.307acPervious58,895sf1.352ac72,2701.659Postdev72,270sf1.659acImpervious60,026sf1.378acPervious12,244sf0.281ac72,2701.659NORTHHALFOFBUILDING+NORTHHALFOFFIRELANE-InfiltrationTrench#2Predev81,046sf1.861acImpervious985sf0.023acPervious80,061sf1.838ac81,0461.861Postdev81,046sf1.861acImpervious48,390sf1.111acPervious32,656sf0.750ac81,0461.861NORTHBUSAREA-RaingardenC&InfiltrationTrench#3Predev35,483sf0.838acImpervious5,882sf0.135acPervious30,601sf0.702ac36,4830.838Postdev36,483sf0.838acImpervious26,915sf0.618acPervious9,568sf0.220ac36,4830.838ModelasRoads/Flat.ModelasC,Lawn,Flat.ModelasRoads/Flat.ModelasC,Lawn,Flat,ModelasRoads/Flat.ModelasC,Lawn,Flat.ModelasRoads/Flat.ModelasC,Lawn,Flat.ModelasRoads/Flat.ModelasC,Lawn,Fiat.16,014sJPGISModelasRoads/Flat,ModelasC,Lawn,Flat,1o3 MAINPARKINGLOT-RaingardenB&InfiltrationTrench#431,514sJPGISIIIIIModelasRoads/Flat.ModelasC,Lawn,Flat.I27,856sfPGISModelasRoads/Flat.ModelasC,Lawn,Flat.(IncludessidewalksandPGIS)IIjoR’ModelasRoads/Flat.ModelasC,Lawn,Flat.Predev59,947sf1.376acImpervious52,620sf1.208acPervious7,327sf0.168ac59,9471.376Postdev59,947sf1.376acImpervious47,110sf1.082acPervious12,837sf0.295ac59,9471.376SOUTHBUSAREA-RaingardenA&InfiltrationTrench#5Predev46,769sf1.074acImpervious41,465sf0.952acPervious5,304sf0.122ac46,7691.074Postdev46,769sf1.074acImpervious35,137sf0.807acPervious11,633sf0.267ac46,7691.074FRONTAGEBYPASSAREA-SidewalksPredev39,899sf0.916acImpervious9,604sf0.220acPervious30,295sf0.695ac39,8990.916Postdev39,899sf0.916acImpervious12,662sf0.291acPervious27,237sf0.625ac39,8990.916ModelasRoads/Flat.ModelasC,Lawn,Flat.3,829sfPG!S TOTALSITEPostdev336,414sf7.723acImpervious230,239sf5.286acPervious106,174sf2.437ac336,4147.72316THAVENUERAINGARDENPredev14,412sf0.331acImpervious9,317sf0.214acPervious5,096sI0.117ac14,4120.331Postdev14,412sf0.331acImpervious8,265sf0.190acPervious6,148sf0.141ac14,4120.331OFFSITEPLAYGROUND-InfiltrationTrench#6Predev34,808sf0.799acImpervious0sf0.000acPervious34,808sf0.799ac34,8080.Z.2Pastdev34,808sf0.799acImpervious27,846sf0.639acPervious6,962sf0.160ac34,8080.799996sftargetPG)54,003sfnon-targetPGISPredev336,414sfImperviousPervious7.723ac123,932sf212,482sf2.845ac4.878ac7.72337%63%68%32%ModelasRoads/Flat.ModelasC,Lawn,Flat.ModelasRoads/Flat.ModelasC,Lawn,Flat.ModelasRoads/Flat.ModelasC,Lawn,Flat.ModelasRoads/Flat.ModelasC,Lawn,Flat.op3 p1Ui4(Ar“7JINL..TA17(‘[1&i77:Cti;r/vik!Ar,c,\JSCommunityPlannersIpt::i•’SWMIIhILt[i]/lLC/i*,tLHviI&.7./5.J(i1/,,;?+jCJ)4+’/4-7_.Us’LandSurveyorsI1(K/iSdp5A1/ii1t,L,Lr/tHvvvJH1ul-L(J2-1v‘vVHLH/vi/iM%hi.253383.2422253.383.2572FAXSEAULE12006thAvenueSuite1620Seattle,WA98101-3123F1€LA.R2Li_HprojectR(VPHECProjectNo.2!VS/SI0PageoffCalculationsSubjectPhoneFaxWith/To_____________________________Fax#MemorandumAddressEMeetingMinutesDate01TelephoneMemo,:6%•W&HHFit1&7L’—StiI’I:‘1.11JraifFaxedPagesBy/V/-/SFSE0IIIp-e‘JlQ,4W,’L’SSF7IIoSF%/T);;--c.—I—eCivilEngineersStructuralEngineersLandscapeArchitectsI.H.IiIt’’c,J—£4SiA1i•i13)235J.TJ%/VL(%’9CH(H%.DI/C{c9[i%:itS)4Un‘f-’4(-I?:su:,/--(j1itNe/ghborsP/67,1/L(+]adL4bfvKLHL/..’Ii-FLji’/i:.i-.iJ_k4teIc1u1ivI(H6)tiLlJo/ti//15/fl/Li,6(X//i/?qLLP(vAt.t;IIIIv-HIt4160,020c-Tc7M‘V)x)ptx2QviLFwillIC2ZI---‘0’OYOciflfvt/vj2/jItT/i2CsiJ/J14511Th4/4DTACOMA2215N.30thSt.Suite300Tacoma,WA98403-3305Ifthisdoesnotmeetwithyourunderstanding,pleasecontactusinwritingwithinsevendays.THANKYOU.205.267.2425205.267.2429FAX 02/23/2012SouthHalfofBuildingInfiltrationTrench#1ifgrasspavedareaispaved.KCRTSOUTPUTFlowFrequencyAnalysisTimeSeriesFile:prel.tsfProjectLocation:Sea—Tac———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks——RankReturnProb(DES)(CFS)Periodc.oo:22/09/0114:000.0031:oo.oo0.9903.033411/34/0:3:003.001225.000.9600.00133/06/0318:000.001310.000.9000.000512/26/030:000.00045.000.8000.000610/28/0417:000.00053.000.6670.000710/24/0523:000.00062.000.5000.000810/26/CE15:000.00071.300.2310.00311/09/083:000.00081.100.091ConputedPeaks0.00250.030.980FlowFrequencyAnalysisT:rneSeriesFiIe:devl.tsfProjectLocation:Sea—Tac———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks—-RankReturnProb(CFS)(CFS)Period0.34372/09/012:000.6711100.000.9903.29481/05/0216:000.500225.000.9600.4:032/27/037:000.410310.000.9000.34368/26/042:000.40745.003.8000.407410/28/0416:003.35853.000.6670.35851/18/0616:000.34362.000.5000.500210/26/060:000.34371.300.2310.67111/09/086:000.29481.100.091ComputedPeaks0.61450.000.980Retention/DetentionFacilityTyoeofFacility:GravelInfiltrationrenchFacilityLength:207.00ftFacilityWidth:3.00ftFacilityArea:621.sq.ftEffectiveStorageDepth:20.00ftStage0Elevation:0.00ftStorageVolume:3726.cu.ftVerticalPermeability:3.00mm/inPermeableSurfaces:BottomRiserHead:20.00ftRiserD:areter:2.OCinchesTopNotchWeir:NoneOutflowRacingCurve:NoneIfgrasspavedareaispaved,InfiltrationTrench#1hastoincreasefrom194LFto207IS.Widenprevioustrenchby0.3’:134’x4.7’=E3Osf.RentonECLCLü4ZInfiltrationCalculationsFigure4-5 I1III1IIIIIKCRTSDataEntry&ComputationSheetProject:21051510-RentonPOLOpage1ofCompby:JMKDate:2/2/2012BasinName:InfiltrationTrench1PredevelopedFileName:PRE1Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKORTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassSouth1/2Bldg&OutwashForest72,2701.659South1/2FireLaneOutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KORTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForest1.659OutwashPastureOutwashGrassWetland----EffectiveImpervious----TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition.20F41 KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:2)23/2012BasinName:InfiltrationTrench1DevelopedFileName:DEV1Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass122440.281Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas1.3781.001.3780.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassDutwashForestOutwashPastureOutwashGrass0.281Wetland——EffectiveImpervious----1.378TotalAreaCheckt1.X\FfFlawPathDataLandUseLengthSlopeNotes:Grasspavedareasassumedtobe100%impervious. 02/23/2012SouthHalfofBuildingInfiltrationTrench#1ifgrasspavedareaispaved.StageElevationStorageDischargePercolation(ft)(if)(cu.ft)(ac—fr)(cfs)(cfs)0.000.000.0.0000.0000.290.270.2750.0.0010.0000.290.530.5399.0.0020.0000.290.600.80149.0.0030.0000.291.071.07199.0.0050.0000.291.331.33246.0.0060.0000.291.601.60298.0.0070.0000.291.871.87348.0.0080.0000.292.132.13397.0.0090.0000.292.402.40447.0.0100.0000.292.672.67497.0.0110.0000.292.932.93546.0.0130.0000.293.203.20596.0.0140.0000.293.473.47647.0.0150.0000.293.733.73695.0.0160.0000.294.004.00745.0.0170.0000.294.274.27796.0.0180.0000.294.534.53844.0.0190.0000.294.804.60894.0.0210.0000.295.075.07945.0.0220.0000.295.335.33993.0.0230.0000.295.605.601043.0.0240.0000.295.875.871094.0.0250.0000.296.136.131142.0.0260.0000.296.406.401192.0.0270.0000.296.676.671243.0.0290.0000.296.936.931291.0.0300.0000.297.207.201341.0.0310.0000.297.477.471392.0.0320.0000.297.737.731440.0.0330.0000.298.008.001490.0.0340.0000.298.278.271541.0.0350.0000.298.538.531589.0.0360.0000.298.808.801639.0.0380.0000.299.079.071690.0.0390.0000.299.339.331738.0.0400.0000.299.609.601789.0.0410.0000.299.879.871839.0.0420.0000.2910.1310.131887.0.0430.0000.2910.4010.401938.0.0440.0000.2910.6710.671988.0.0460.0000.2910.9310.932036.0.0470.0000.2911.2011.202087.0.0480.0000.2911.4711.472137.0.0490.0000.2911.7311.732185.0.0500.0000.2912.0012.002236.0.0510.0000.2912.2712.272286.0.0520.0000.2912.5312.532334.0.0540.0000.2912.8012.802385.0.0550.0000.2913.0713.072435.0.0560.0000.2913.3313.332483.0.0570.0000.2913.6013.602534.0.0580.0000.29RentonECLCHOP71InfiltrationCalculationsFigure4-5 InfiltrationTrenchhiifgrasspavedareaispaved.02/23/2012SouthHalfofBuildingRentonECLC:3.87.3.872584.0.0590.0000.2914.1314.132632.0.0600.0000.29:4.40:4.402683.0.0620.0000.2914.67:4.672733.0.0630.0000.2914.93:4.932782.0.0640.0000.2915.2015.202832.0.0650.0000.2915.4715.472882.0.0660.0000.2915.7315.732931.0.0670.0000.2916.0016.002981.0.0680.0000.2916.2716.273031.0.0700.0000.2916.5316.533080.0.0710.0000.2916.8016.803130.0.0720.0000.2917.0717.073180.0.0730.0000.2917.3317.333229.0.0740.0000.2917.6017.603279.0.0750.0000.2917.87:7.873329.0.0760.0000.2916.13:8.133378.0.0790.0000.2918.40.8.403428.0.0790.0000.29:5.67:8.673478.0.0800.0000.23:8.9318.933527.0.0810.0000.2919.2019.203577.0.0820.0000.2919.4719.473627.0.0830.0000.2919.7319.733676.0.0840.0000.2920.0020.003726.0.0860.0000.2920.1020.103726.0.0860.3080.2920.2020.203726.0.0860.8710.2920.3020.303726.0.0861.6000.2920.4020.403726.0.0862.3900.2920.5020.503726.0.0862.6700.2920.6020.60372€.0.08€2.9300.2920.7020.703726.0.0863.1630.2920.8020.603726.0.0363.3500.2920.9020.903726.0.0863.5900.2921.0021.003726.0.0863.7800.2921.1021.103726.0.0863.9700.292Z2021.203726.0.c854.1400.2921.3021.303726.0.0664.3100.2921.4021.403726.0.0864.4700.2921.5021.503726.0.0864.6300.2921.6021.603726.0.0864.7800.29OutflowPeakStorageHydInflowTargetCaicStageElev(Cu-Ft)(Ac—Ft)10.670.000.3120.1020.103726.0.08620.500.006.126.121140.0.0263‘0.41*t*tn0.003.933.93731.0.0:740.31**0.000.100.1013.0.00050.17flfl***0.000.000.00C.0.00060.170.000.000.000.0.00070.25***t*n0.000.000.000.0.00080.3:*0.000.250.250.001InfiltrationCalculationsFigure4-5 02/23/2012SouthHalfofBuildingInfiltrationTrench#1ifgrasspavedareaispaved.RouteTimeSeriesthroughFacilityInflowTimeSeriesFile:devl.tsfOutflowTimeSeriesFile:rdoutlInflow/OutflowAnalysisPeakInflowDischarge:0.671OFSat6:00onJan9inYear8PeakOutflowDischarge:0.000CFSat10:00onJan9inYear8PeakReservoirStage:20.10FtPeakReservoirElev:20.10FtPeakReservoirStorage:3726.Cu-Ft0.086Ac-FtFlowFrequencyAnalysisTimeSeriesFile:rdoutl.tsfProjectLocation:Sea—Tac—--AnnualPeakFlowRates--—FlowFrequencyAnalysisFlowRateRankTimeofPeak-—Peaks--RankReturnProb(CFS)(CFS)(it)Period0.000410/01/000:000.00019.881100.000.9900.000510/01/010:000.0006.12225.000.9600.000610/01/020:000.0003.37310.000.9000.000710/01/030:000.0000.0045.000.8000.000310/28/0419:000.0000.0053.000.6670.000810/01/050:000.0000.0062.000.5000.000210/26/063:000.0000.0071.300.2310.00011/09/0810:000.0000.0081.100.091ComputedPeaks0.00015.2950.000.980Thisinfiltrationtrenchmodelinfiltratescompletely,asillustratedbyzeroflowatanyofthecalculatedpeaks.IRentonECLCOFqiInfiltrationCalculationsFigure4-5 InfiltrationTrench#1ifgrasspavedareaispaved.02/23/2012SouthHalfofBuildingtrenchmodel,KCRTScouldnotcalculateorplotadurationcomparison.RentonECLCInfiltrationCalculations7ppL47Figure4-5Flow[ra:iozfromT:neSeriesFiIe:rdoutl.tsfCutoffCountFrequencyCDFExceedenceProbabilityCE’S0.0006:320:oo.oco100.0000.0’OO0.000E+000.30000.003100.0000.0000.000EDO0.00000.000100.0000.000O.000E*OO0.00000.000100.0000.000O.000E+OO0.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+0099999.9900.000100.0000.0000.000E+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005÷000.000C0.000100.0000.0000.0CDE000.00000.000100.0000.0000.000E—0O0.000C0.000100.0000.0000.0C0E0C0.00000.000100.0000.0000.000E+0C99999.9900.000100.0000.0000.000E÷000.00000.000100.0000.0000.000E000.00000.000100.0000.0000.000E÷000.00000.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.0005÷0099999.99C0.000100.0000.0000.0005—000.00000.000100.0000.0000.0005—00000000fl3Q0000000000000000.00000.000100.0000.0000.0005—000.00000.000100.0000.0000.0005—000.00000.000100.0000.0000.000E-000.000C0.000100.0000.0000.0005÷000.00000.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+00Duetotheminisculethresholdswithinthisparticularinfiltration FlowFrequencyAnalysisTimeSeriesFile:pre2.tsfProjectLocation:Sea—TaoFlowFrequencyAnalysisTimeSeriesFile:dev2.tsfProjectLocation:Sea—TacRetention/DetentionFacilityTypeofFacility:FacilityLength:FacilityWidth:FacilityArea:EffectiveStorageDepth:Stage0Elevation:StorageVolume:VerticalPermeability:PermeableSurfaces:BottomRiserHead:RiserDiameter:TopNotchWeir:NoneOutflowRatingCurve:NoneNorthHalfofBuildingInfiltrationTrench#2ifgrasspavedareaispaved.IIIIfgrasspavedareaispaved,InfiltrationTrench#2hastoincreasefrom196LFto210LF.Lengthenprevioustrenchby8.4’:126’x5’630sf.RentonECLCInfiltrationCalculationsSop1lFigure4-502/23/2012KCRTSOUTPUTI———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak--Peaks--RankReturnProb(CFS)(CFS)Period0.001312/05/0018:000.0031100.000.9900.000511/03/0123:000.001225.000.9600.00123/06/0318:000.001310.000.9000.000612/23/030:000.00145.000.8000.00141/04/0520:000.00053.000.6670.000710/24/0520:000.00062.000.5000.000810/26/0613:000.00071.300.2310.00311/09/083:000.00081.100.091ComputedPeaks0.00250.000.980———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks——RankReturnProb(CFS)(CFS)Period0.29352/09/012:000.5791100.000.9900.23781/05/0216:000.403225.000.9600.35632/27/037:000.356310.000.9000.27778/26/042:000.32845.000.8000.328410/28/0416:000.29353.000.6670.29061/18/0616:000.29062.000.5000.403210/26/060:000.27771.300.2310.57911/09/086:000.23781.100.091ComputedPeaks0.52050.000.980TrenchGravelInfiltration210.00ft3.00ft630.sq.ft20.00ft0.00ft3780.cu.ft3.00mm/in20.0012.00ftinches KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:2/2/2012BasinName:InfiltrationTrench2PredevelopedFileName:PRE2Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassNorth1/2Bldg&OutwashForest81,0461.861North1/2FireLaneOutwashPastureOutwashGrassWetland—ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTiNForestTillPastureTillGrassOutwashForest1.861OutwashPastureOutwashGrassWetland----EffectiveImpervious----TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition.‘lopL1l IIIIIIIIIII1I1KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/23/2012BasinName:InfiltrationTrench2DevelopedFileName:DEV2Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassDutwashForestDutwashPasturePerviousAreasOutwashGrass32,6560.750Wetland—ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas1.1111,0011110.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.750Wetland----EffectiveImpervious—--1.111TotalAreaCheck0FlowPathDataLandUseLengthSlopeNotes:(00F111 02/23/2012NorthHalfofBuildingInfiltrationTrench2ifgrasspavedareaispaved.StageElevationStorageDischargePercolation(if)(ft)(cu.ft)(ac—ft)(cfs)(cfs)0.000.000.0.0000.0000.290.270.2751.o.oo:0.0000.290.530.53100.0.0020.0000.290.800.80151.0.0030.0000.291.071.07202.0.0050.0000.291.331.33251.0.0060.0000.291.601.60302.0.0070.0000.291.871.87353.0.0080.0000.292.132.13403.0.0090.0000.292.402.40454.0.0100.0000.292.672.67505.0.0120.0000.292.932.93554.0.0130.0000.293.203.20605.0.3140.3000.293.473.47656.0.0150.0000.293.733.73705.0.0160.0000.294.004.00756.0.0170.0000.294.274.27807.0.0190.0000.294.534.53856.0.0200.0000.294.804.80907.0.0210.0000.295.075.07958.0.0220.0000.295.335.331007.0.0230.0000.295.605.601058.0.0240.0000.295.875.871109.0.0250.0000.296.136.131159.0.0270.0000.296.406.401210.0.0280.0000.296.676.671261.0.0290.0000.296.936.931310.0.0300.0000.297.207.201351.0.0310.0000.297.477.47:4:2.0.0320.0000.297.737.731461.0.0340.0000.298.008.001512.0.0350.0000.298.278.271563.0.0360.0000.298.538.531612.0.0370.0000.299.808.901663.0.0360.0000.299.079.071714.0.0390.0000.299.339.331763.0.0400.0000.299.609.601814.0.0420.0000.299.879.871865.0.0430.0000.2910.1310.131915.0.0440.0000.2910.4010.401966.0.0450.0000.2910.6710.672017.0.0460.0000.2910.9310.932066.0.0470.0000.2911.2011.202117.0.0490.0000.2911.471:.472:68.0.0500.0000.2911.7311.732217.0.0510.0000.29:2.0012.002268.0.0520.0000.2912.2712.272319.0.0530.0000.2912.53.2.532368.0.0540.0000.2912.8012.802419.0.0560.0000.29:3.0713.072470.0.0570.0000.2913.3313.332519.0.0580.0000.2913.6013.602570.0.0590.0000.29RentonECLC[1OF42InfiltrationCalculationsFigure4-5 02/23/2012NorthHalfofBuildingInfiltrationTrench#2ifgrasspavedareaispaved.13.8713.872621.0.0600.0000.2914.1314.132671.0.0610.0000.2914.4014.402722.0.0620.0000.2914.5714.672773.0.0643.0033.2914.9314.932822.0.0650.0003.2915.2015.232873.0.0660.0000.2915.4715.472924.0.0670.0000.2915.7315.732973.0.0680.0000.2916.0016.003024.0.0690.0000.2916.2716.273075.0.0710.0000.2916.5316.533124.0.0720.0000.2916.8016.803175.0.0730.0000.2917.0717.073226.0.0740.0000.2917.3317.333275.0.C750.0000.29:7.6017.603325.0.0760.0000.29:7.87:7.873377.0.0780.0000.2918.1319.133427.0.0790.0000.2919.4018.403478.0.0800.0000.2918.6718.673529.0.0810.0000.2918.9318.933578.0.0820.0000.2919.2019.203629.0.0830.0000.2919.4719.473680.0.0840.0000.2919.7319.733729.0,0850.0000.2920.0020.003780.0.0870.0000.2920.1020.103780.0.0870.3080.2920.2020.203780.0.0870.8710.2920.3020.303780.0.0871.6000.2920.4020.40./bU.0.0872.3900.2920.5020.503780.0.0872.6700.2920.6020.603780.0.0872.9300.2920.7020.703780.0.0873.1600.2920.8020.803780.0.0873.3800.2920.9020.903780.0.0873.5900.2921.0021.003780.0.0873.7800.2921.1021.103780.0.0873.9700.2921.2021.203790.0.0874.1400.2921.3021.30378C.0.0874.3100.2521.4021.403780.0.0874.4700.2921.5021.503780.0.0874.6300.2921.6021.603780.0.0874.7800.29HydInflowOutflowPeakStorageTargetCabStageEIev(Cu—Ft)Ac—Et)0.580.000.0019.9919.993777.0.08720.36nx*rrr0.001.241.24234.0.00530.290.000.000.001.0.00040.2000.30.000.000.0.00050.29““0.000.000.000.0.00060.160.000.000.000.0.00070.14“““0.000.000.000.0.00080.110.000.000.000.0.000RentonECLCI2_OFInfiltrationCalculationsFigure4-5 02/23/2012NorthHalfofBuildingInfiltrationTrench#2ifgrasspavedareaispaved.RouteTineSeriesthroughFacilityInflowTimeSeriesFile:dev2.tsfOutflowTimeSeriesFile:rdou:2Inflow/OutflowAnalystsPeakInflowDischarge:0.579CFSat6:00onJan9inYear8PeakOutflowDischarge:0.000CFSat10:00onJan9inYear8PeakReservoirStage:19.99FtPeakReservoirElev:19.99FtPeakReservoirStorage:3777.Cu—Ft0.087Ac-FtFlowFrequencyAnalysisTimeSeriesFile:rdcut2.tsfProjectLccation:Sea—Tac--—AnnualPeakFlowRates———1owFrequencyAnalysisFlcwRateRankTimeofPeak——Peaks——RankReturnProb(CFS)(CFS)(ft)Period0.000210/01/000:000.00019.991100.000.9900.000310/01/010:000.DOD0.00225.000.9600.000410/01/020:000.0000.00310.000.9000.000510/01/030:000.0000.0045.000.8000.000610/01/040:000.0000.0053.000.6670.000710/01/050:000.0000.0062.000.5000.000810/01/060:000.0000.0071.300.2310.00011/09/0810:000.0000.0081.100.091ComputedPeaks0.00013.3250.000.980Thisinfiltrationtrenchmodelinfiltratescompletely,asillustratedbyzeroflowatanyofthecalculatedpeaks.RentonECLCOFqaInfiltrationCalculationsFigure4-5 02/23/2012NorthHalfofBuildingInfiltrationTrench#2ifgrasspavedareaispaved.FlowDurationfromTimeSeriesFile:rdout2.tsfCutoffCountFrequencyCDFExceedenceProbabilityCFS0.00061320100.300100.0000.0000.0D0E-000.00000.000130.0000.000O.000E—0O0.00000.000130.0000.000D.000E000.00000.000100.3000.0000.000E+C00.00000.000100.0000.0000.000E+000.00000.000:oo.ooc0.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000:oo.ooo0.0000.000Er0099999.9900.000100.0000.0000.000E—030.00000.000100.0000.0003.000E+000.00000.000100.0000.000C.000EtOO0.00000.000100.0000.0000.000:÷0•00.00000.000100.0000.0000.000E±000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.000E+0099999.9900.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100,0000.000D.000E+oo0.00000.000100.0000.0000.0005±000.00000.000100.0000.0000.0035+0099999.9900.000100.0000.0000.0005+00Duetotheminisculethresholdswithinthisparticularinfiltrationtrenchmodel,KCRTScouldnotcalculateorplotadurationcomparison.IIRentonECLC14OFHZInfiltrationCalculationsFigure4-5 02/02/2012NorthBusArea—InfiltrationTrench$13KCRTSOUTPUTFlowFrequencyAnalysisTimeSeriesFile:pre3.tsfProjectLocation:Sea—Tac—--AnnualFlowRate(CFS)0.0000.0000.0000.0000.0000.0000.000nLi•ComputedPeaksFlowFrequencyAnalysisTimeSeriesFile:dev3.tsfProjectLocation:Sea—Tac———AnnualPeakFlowRates———FlowRateRankTimeofPeak(CES)0.1570.1320.1880.1540.1830.1610.2240.308ComputedFlowFrequencyAnalysis——Peaks——RankReturnProbCFS)Period0.0021100.000.9900.000225.000.5630.000310.000.900’0.00045.000.8000.00053.000.6570.000€2.000.5000.00071.300.2310.00081.100.0910.00150.000.980FlowFrequencyAnalysis-—Peaks——RankReturnProbCFS)Period3.3081100.000.9900.224225.000.9500.188310.000.9000.18345.000.8000.16153.000.5670.15752.000.5000.15471.300.2310.13281.100.0910.28050.000.980Retention/DetentionFacilityTyoeofFacility:FacilityLength:FacilityWidth:FacilityArea:EffectiveStorageDepth:StageCElevation:StorageVolume:VerticalPermeability:PermeableSurfaces:RiserHead:RiserDiameter:TopNotchWeir:OutflowRatingCurve:GravelInfzltration95.00ft3.00ft285.sq.ft20.00ft0.00ft1710.cu.ft3.00mm/inBottomNone:one20.00ft12.00inchesRentonECLCInfiltrationCalculations(oFq2-Figure4-5PeakFlowRates———RankTimeofPeak210/08/003:1/18/01410/31/0251/17/04610/28/04710/27/05810/26/0611/09/087:001:0020:0015:0017:0011:002:003:0052/09/0181/05/0232/27/0378/26/04410/28/0451/18/06210/26/0611/09/082:0016:007:002:0016:0016:000:006:00PeaksTrench IIIIIIIII1IIKCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/2/2012BasinName:InfiltrationTrench3PredevelopedFileName:PRE3Region:SeatacScaleFactor:1,00TimeStep:HourlyRecordLength:ReducedTotalAcreage:‘.•....:.;...PeMousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(Sf)AcreageTillForestTillPastureTillGrassNorthBusAreaOutwashForest36,4830.838DutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForest0.838DutwashPastureOutwashGrassWetland----EffectiveImpervious----TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition.ICoOF42- IKCRTSDataEntry&ComputationSheet1Project:210515.10-RentonECLCpage1ofCompby:JMKDate:1/26/2012BasinName:InfiltrationTrench3DevelopedFileName:DEV3Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasQutwashGrass95680220Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas0.6181000.6180.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.220Wetland----EffectiveImpervious--0.618TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:170F‘-12- I02/02/2012NorthBusArea—InfiltrationTrenchP3StageElevationStorageDischargePercolation(ft)(ft)(cu.if)(ac—if)(cfs)(cfs)0.000.000.0.0000.0000.130.270.2723.0.0010.0000.130.53-0.5345.0.0010.0000.130.800.8068.0.0020.0000.131.071.0792.0.0020.0000.131.33.33114.0.0030.0000.131.601.50137.0.0030.0000.131.871.87150.0.0040.0000.132.132.13182.0.0040.0000.132.402.40205.0.0350.0000.132.672.57228.0.0050.0000.132.532.93251.0.0050.0000.133.203.20274.0.0050.000DZ.33.473.47297.0.0070.0000.133.733.73319.0.0070.0000.134.004.00342.0.0080.0000.134.274.27355.0.0080.0000.134.534.53387.0.0090.0000.134.804.80410.0.0090.0000.135.075.07434.0.0100.0000.135.335.33456.0.0100.0000.135.505.60479.0.0110.0000.135.875.87502.0.0120.0000.136.136.13524.0.0120.0000.136.406.40547.0.0130.0000.136.576.67570.0.0130.0000.136.936.93593.0.0140.0000.137.207.20616.0.0140.0000.137.477.47639.0.0150.0000.137.737.73661.0.0150.0000.138.008.00684.0.0160.0000.138.278.27707.0.0160.0000.138.538.53729.0.0170.3000.138.808.80752.0.0170.0000.139.079.07776.0.0180.0000.139.339.33798.0.0180.0000.135.609.60821.0.0190.0000.139.879.87844.0.0190.0000.1310.1310.13866.0.0200.0000.13:0.4010.40889.0.0200.0000.13:0.67:ro.67912.0.0210.0000.13:0.93:0.93935.0.0210.0000.13:1.20:1.20sse.0.0220.0000.1311.4711.47se:.0.0230.0000.13:1.7311.731003.0.0230.0000.1312.0012.001026.0.0240.0000.1312.2712.271049.0.0240.0000.1312.5312.531071.0.0250.0000.1312.8012.801094.0.0250.0000.1313.0713.071118.0.0260.0000.1313,3313.331140.0.0260.0000.1313.5013.501163.0.0270.0000.13RentonECLCieOFL47_InfiltrationCalculationsFigure45 02/02/2012NorthBusArea—InfiltrationTrench#313.6713.871186.0.0270.0000.1314.1314.131208.0.0280.0000.1314.4014.401231.0.0280.0000.1314.6714.671254.0.0290.0000.1314.9314.931277.0.0290.0000.1315.2015.201300.0.3300.0000.1315.4715.471323.0.0300.0000.1315.7315.731345.0.0310.0000.1316.0016.001369.0.0310.0000.1316.2716.271391.0.0320.0000.1316.5316.531413.0.0320.0000.1316.8016.801436.0.0330.0000.1317.0717.071460.0.0340.0000.1317.3317.331482.0.0340.0000.137.5017.601505.0.0350.0000.13:7.6717.971528.0.0350.0000.1318.1318.131550.0.0360.0000.1318.4018.401573.0.0360.0000.1318.6718.671596.0.0370.0000.1318.9318.931619.0.0370.0000.1319.2019.201642.0.0380.0000.1319.4719.471665.0.0380.0000.139.7319.731687.0.0390.0000.1320.0020.001710.0.0390.0000.1320.1020.101710.0.0390.3080.1320.2020.201710.0.0393.8710.1320.3020.301710.0.0391.6000.1320.4020.401710.0.0392.3900.1320.5020.501710.0.0392.6700.1320.6020.601710.0.0392.9300.1320.7020.701710.0.0393.1600.1320.8020.801710.0.0393.3800.1320.9020.501710.0.0393.5900.1321.0021.001710.0.0393.7800.1321.1021.101710.0.0393.9700.1321.2021.201710.0.0394.1400.1321.3021.301710.0.0394.3100.1321.4021.401710.0.0394.4700.1321.5021.501710.0.0394.6300.1321.6021.601710.0.0394.7800.13Hyd:nflowOutflowPeakStorageTargetCa.cStageElevCu—Ft)(Ac—Et)0.310.000.1320.0420.041710.0.03920.19*******0.003.523.52301.0.00730.16*‘“0.001.371.37117.0.00340.110.000.000.000.0.00050.16““0.002.482.48212.0.00560.090.000.000.000.0.00070.080.000.000.000.0.00060.11****t0.000.000.000.0.000RentonECLCInfiltrationCalculationsFigure4-5 I02/02/2012NorthBusArea—InfiltrationTrench#3RouteTimeSeriesthroughFacilityInflowTimeSeriesFile:dev3.tsfOutflowTimeSeriesFile:rdout3Inflow/OutflowAnalysisPeakInflowDischarge:0.308CFSat6:00onJan9inYearBPeakOutflowDischarge:0.000CFSat10:00onJan9inYear$PeakReservoirStage:20.04FtPeakReservoirElev:20.04FtPeakReservoirStorage:1710.Cu-Ft0.039Ac-FtFlowFrequencyAnalysisTimeSeriesFile:rdout3.tsfProjectLocation:Sea—Tac---AnnualPeakFlowRates-—-FlowFrequencyAnalysisFlowRateRankTimeofPeak—-Peaks—-RankReturnProb(CFS)(CFS)(ft)Period0.000410/01/000:000.00019.921100.000.9900.000510/01/010:000.0005.5$225.000.9600.000610/01/020:000.0002.26310.000.9000.000710/01/030:000.0000.0045.000.8000.000310/28/0419:000.0000.0053.000.6670.000810/01/050:000.0000.0062.000.5000.000210/26/063:000.0000.0071.300.2310.00011/09/0810:000.0000.0081.100.091ComputedPeaks0.00015.1450.000.980Thisinfiltrationtrenchmodelinfiltratescompletely,asillustratedbyzeroflowatanyofthecalculatedpeaks.jOop142-RentonECLCInfiltrationCalculationsFigure4-5 02/02/2012NorthBusArea—InfiltrationTrench#3FlowDurationfromTimeSeriesFile:rdout3.tsfCutoffCountFrequencyCDFExceedenceProbabilityCFS0.00061320100.000100.0000.0000.000E+000.00000.000100.0000,0000.0001+030.00300.003100.0000.0000.0001±030.00000.000100.0000.0030.0001±000.00000.000:oo.ooo0.0000.0001+030.00000.000100.0000.0000.0001+030.00000.000100,0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.30300.000100.0000.0000.0001÷300.00000.000100.0000.0003.0301—000.00000.000100.0000.3300.030E-300.000o3.000:oo.ooo0.0000.0001—000.00000.000100.0000.0000.0001+0099999.9900.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+0099999.9900.000100.0000.0300.3001+0099999.9900.000:oo.ooo0.0000.0301+300.00000.000:oo.ooo0.0000.0301+300.30000.000100.0000.0030.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+0099999.9900.000100.0000.0000.0031+000.00300.003133.0300.0000.0031+003.00000.000100.0000.0000.0001+000.00000.000100.0003.0000.0001+000.00000.000100.0000.0000.0001+000.00300.000100.0000.0000.0001+000.Q0000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+0099999.9900.000103.0000.0000.0031+00Duetotheminisculethresholdswithinthisparticularinfiltrationtrenchmodel,KCRTScouldnotcalculateorplotadurationcomparison.RentonECLC21‘1InfiltrationCalculationsFigure4-5 02/02/2012MainParkingArea—InfiltrationTrench#4KCRTSOUTPUTFlowFrequencyAnalysisTimeSeriesFile:pre4.tsfProjectLocation:Sea—Tac-—-AnnualPeakFlowRates—--FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks——RankReturnProb(CFS)(CFS)Period0.00122/09/0114:000.0031100.000.9900.000411/04/0122:000.001225.000.9600.00133/06/0317:000.001310.000.9000.000512/26/036:000.00045.000.8000.000610/28/0416:000.00053.000.6670.000710/26/055:000.00062.000.5000.000810/26/061:000.00071.300.2310.00311/09/083:000.00081.100.091ComputedPeaks0.00250.000.980FlowFrequencyAnalysisTimeSeriesFile:dev4.tsfProjectLocation:Sea—Tac——-AnnualPeakFlowRates-—-FlowFrequencyAnalysiFlowRateRankTimeofPeak-—Peaks——RankReturnProb(CFS)(CFS)Period0.27262/09/012:000.5321100.000.9900.23181/05/0216:000.393225.000.9600.32632/27/037:000.326310.000.9000.26978/26/042:000.32045.000.8000.320410/28/0416:000.28153.000.6670.28151/18/0616:000.27262.000.5000.393210/26/060:000.26971.300.2310.53211/09/086:000.23181.100.091ComputedPeaks0.48650.000.980Retention/DetentionFacilityTypeofFacility:GravelInfiltrationTrenchFacilityLength:194.00ftFacilityWidth:3.00ftFacilityArea:582.sq.ftEffectiveStorageDepth:20.00ftStage0Elevation:0.00ftStorageVolume:3492.Cu.ftVerticalPermeability:3.00mm/inPermeableSurfaces:BottomRiserHead:20.00ftRiserDiameter:12.00inchesTopNotchWeir:NoneOutflowRatingCurve:NoneRentonECLCInfiltrationCalculationsFigure43 KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:2/2/2012BasinName:InfiltrationTrench4PredevelopedFileName:PRE4Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreagePerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassMainParkingLotOutwashForest59,9471.376OutwashPastureOutwashGrassWetland- -ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForest1.376OutwashPastureOutwashGrassWetland----EffectiveImpervious-- --TotalAreaCheckpFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition. I1IIIIIIIIIKCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:1/25/2012BasinName:InfiltrationTrench4DevelopedFileName:.DEV4Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:IflPerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(si’)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass12.8370.295Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas1.0821.001.0820.000N/AAdjustedLandUseAreasBasedonElFCalculationsKCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassDutwashForestOutwashPastureDutwashGrass0.295Wetland—--EffectiveImpervious----1.082TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes: 02/02/2012MainParkingArea—InfiltrationTrench#4StageElevationStorageDischargePercolation(if)(if)(cu.if)(ac—fr)(cfs)(cis)0.000.000.0.0000.0000.270.270.2747.0.0010.0000.270.530.5393.0.0020.0000.270.800.80140.0.0030.0000.271.071.07187.0.0040.0000.271.331.33232.0.0050.0000.271.601.60279.0.0060.0000.271.871.87327.0.0070.0000.272.132.13372.0.0090.0000.272.402.40419.0.0100.0000.272.672.67466.0.0110.0000.272.932.93512.0.0120.0000.273.203.20559.0.0130.0000.273.473.47606.0.0140.0000.273.733.73651.0.0150.0000.274.004.00698.0.0160.0000.274.274.27746.0.0170.0000.274.534.53791.0.0180.0000.274.804.80838.0.0190.0000.275.075.07885.0.0200.0000.275.335.33931.0.0210.0000.275.605.60578.0.0220.0000.275.875.871025.0.0240.0000.276.136.131070.0.0250.0000.276.406.401117.0.0260.0000.276.676.671165.0.0270.0000.276.936.931210.0.0280.0000.277.207.201257.0.0290.0000.277.477.471304.0.0300.0000.277.737.731350.0.0310.0000.278.008.001397.0.0320.0000.278.278.271444.0.0330.0000.278.538.531499.0.0340.0000.278.808.801537.0.0350.0000.279.079.071584.0.0360.0000.279.339.331629.0.0370.0000.279.609.601676.0.0380.0000.279.879.871723.0.0400.0000.2710.1310.131769.0.0410.0000.2710.40.0.40181€.0.0420.0000.2710.6710.67863.0.0430.0000.2710.9310.931908.0.0440.0000.2711.2011.201956.0.0450.0000.2711.4711.472003.0.0460.0000.2711.7311.732048.0.0470.0000.2712.0012.002095.0.0480.0000.2712.2712.272142.0.0490.0000.2712.5312.532188.0.0500.0000.2712.8012.802235.0.0510.0000.2713.0713.072282.0.0520.0000.2713.3313.332327.0.0530.0000.2713.6013.602375.0.0550.0000.27RentonECLCJ_pLjl—InfiltrationCalculationsFigure4-5 I02/02/2012MainParkingArea—InfiltrationTrench#413.8713.872422.0.0560.0000.2714.1314.132467.0.0570.0000.2714.4014.402514.0.0580.0000.2714.6714.672561.0.0590.0000.2714.9314.932607.0.0600.0000.2715.2015.202654.0.0610.0000.2715.4715.472701.0.0620.0000.2715.7315.732747.0.0630.0000.2716.0016.002794.0.0640.0000.2716.2716.272841.0.0650.0000.2716.5316.532886.0.0660.0000.2716.8016.802933.0.0670.0000.2717.0717.072980.0.0690.0000.2717.3317.333026.0.0690.0000.2717.6017.603073.0.0710.0000.2717.8717.873120.0.0720.0000.2718.1319.133166.0.0730.0000.2718.4019.403213.0.0740.0000.2718.6718.673260.0.0750.0000.2718.9319.933305.0.0760.0000.2719.2019.203352.0.0770.0000.2719.4719.473400.0.0780.0000.2719.7319.733445.0.0790.0000.2720.0020.003492.0.0800.0000.2720.1020.103492.0.0800.3080.2720.2020.203492.0.0800.8710.2720.3020.303492.0.0801.6000.2720.4020.403492.0.0802.3900.2720.5020.503492.0.0802.6700.2720.6020.603492.0.0802.9300.2720.7020.703492.0.0803.1600.2720.8020.803492.0.0803.3800.2720.9020.903492.0.0803.5900.2721.0021.003492.0.0803.7800.2721.1021.103492.0.0803.9700.2721.2021.203492.0.0804.1400.2721.3021.303492.0.0804.3100.2721.4021.403492.0.0904.4700.2721.5021.503492.0.0804.6300.2721.6021.603492.0.0804.7800.27HydInflowOutflowPeakStorageTargetCaicStageElev(Cu—Ft)(Ac—Ft)0.530.000.0019.9119.913476.0.08020.240.000.000.000.0.00030.140.000.000.000.0.00040.13*******0.000.000.000.0.00050.200.000.000.000.0.00060.320.001.381.38242.0.00670.25*******0.000.000.000.0.00080.39*******0.002.382.38416.0.010RentonECLC‘Z&OFLI1InfiltrationCalculationsFigure4-5 02/02/2012MainParkingArea—InfiltrationTrench#4RouteTimeSeriesthroughFacilityInflowTimeSeriesFile:dev4.tsfOutflowTimeSeriesFile:rdou:4Inflow/OutflowAnalysisPeakInflcwDischarae:0.532CFSat6:00onJan9inYear8PeakOttflcwDischarae:0.000CE’Sat10:00onJan9inYear8PeakReservoirStace:19.91F:PeakReservoir51ev:19.91FtPeakReservoirStorage:3476.Cu-Ft0.080Ac—FtFlowFrequencyAnalysisTimeSeriesFile:rdout4.tsfProjectLocation:Sea—Tac-——AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks——RankReturnProb(CFS)(CFS)(ft)Period0.000310/01/000:000.00019.911100.000.9900.000410/01/010:000.0000.26225.000.9600.000510/01/020:000.0000.00310.000.9000.000610/01/030:000.0000.0045.000.8000.000710/01/040:000.0000.0053.000.6670.000810/01/050:000.0000.0062.000.5000.0002:0/26/063:000.0000.0071.300.2310.00011/09/0810:000.0000.0081.100.091ComotedPeaks0.00013.3650.000.980Thisinfiltrationtrenchmodelinfiltratescompletely,asillustratedbyzeroflowatanyofthecalculatedpeaks.2-7cF42-RentonECLCInfiltrationCalculationsFigure4-5 02/02/2012MainParkingArea—InfiltrationTrench#4FlowDurationfromTimeSeriesFile:rdout4.tsfCutoffCountFrequencyCDFExceedenceProbabilityCFS—0.00061320100.000100.0000.0000.000E+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.0006+000.00000.000100.0000.000C.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.0001+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.0006+000.00000.300100.0000.0030.0031÷000.00000.300100.0000.0030.0001÷000.30000.000100.0000.0000.0006—000.00000.000100.0000.0003.0001—003.30000.000100.0000.0000.0001±0099999.9900.000100.0CC0.0000.0001+000.00000.000100.3000.0000.0001+000.00000.000100.3000.0000.0001+000.00300.000100.0000.0CCC.000E+0099999.9900.000100.0000.0000.0006+0099999.9900.000100.0030.0000.0031+000.00000.000100.0000.0000.0006+000.000C0.000100.0000.0000.000E+000.00000.000100.0000.0000.000E--000.00000.0CC:oo.ooo0.0000.0001+000.00000.030DC.0000.0000.000E+C00.000C0.000133.0300.0000.0001÷0099999.9900.000103.0000.0000.0001+000.000C0.000100.0000.0000.0001+000.000C0.000100.0000.0300.0031+000.000C0.000100.0000.0000.0006÷000.000C0.000100.0000.0030.CCCECC0.000C0.000100.0000.000C.C0CECC0.300C0.000100.0000.000o.ooo:÷oo0.00000.000100.0000.0000.0006÷0099999.9900.000100.0000.0000.0006+00Duetotheminisculethresholdswithinthisparticularinfiltrationtrenchmodel,KCRTScouldnotcalculateorplotadurationcomparison.II29°F42-RentonECLCInfiltrationCalculationsFigure4-5 02/02/2012SouthBusArea—InfiltrationTrench#5KCRTSOUTPUTFlowFrequencyAnalysisTimeSeriesFile:pre5.tsfProjectLocation:Sea—Tac—--AnnualPeakFlowRates—-—FlowRateRankTimeofPeak(CES)0.000o.DODO.0010.0CCnOn.J.V’so.COO0.0000.002ComputedFlowFrequencyAnalysis——Peaks——RankReturnProb(CFS)Period0.0021100.000.9900.001225.000.9600.000310.000.9000.00045.000.8000.00053.000.6670.00052.000.5000.00071.300.2310.00081.100.0910.00250.000.980FlowFrequencyAnalysisTimeSeriesFile:dev5.tsfProjectLocation:Sea—Tac———AnnualFlowRate(CFS)0.2040.1720.2450.2010.2380.2100.2930.400ComputedPeaksRetention/DetentionFacilityTyeofFacility:FacilityLength:FacilityWidth:FacilityArea:EffectiveStorageDepth:Stage0Elevation:StorageVolume:VerticalPermeability:PermeableSurfaces:RiserHead:RiserDiameter:TopNotchWeir:OutflowRatingCurve:1owFrequencyAnalysis——Peaks——RankReturnProb(CFS)Period0.4CC1100.000.9900.293225,000.9600.245310.000.9000.23845.000.8000.21053.000.6670.20462.000.5000.20171.300.2310.17281.100.0910.36550.000.980Gravel:nfiltratcn123.00ft3.00ft369.sq.ft20.00ft0.00ft2214.cu.ft3.00mm/inBottomNoneNone20.00ft12.00nchesRentonECLCInfiltrationCalculations7AOF42-310/08/004:1/05/0123/06/0351/12/04610/28/04710/26/05810/26/0611/09/085:000:0018:001:0016:008:002:003:00PeaksPeakFlowRates———RankTimeofPeak62/09/0181/05/0232/27/0378/26/04410/28/0451/18/06210/26/0611/09/082:0016:007:002:0016:0016:000:006:00TrenchFigure4-5 KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/2/2012BasinName:InfiltrationTrench5PredevelopedFileName:PRE5Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(Sf)AcreageTillForestTillPastureTillGrassSouthBusAreaOutwashForest46,7691,074OutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForest1.074OutwashPastureOutwashGrassWetland----EffectiveImpervious----TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition.IIIIIIIIIII300F1{2 [KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:1/26/2012BasinName:InfiltrationTrench5DevelopedFileName:DEV5Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PeMousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasQutwashGrass11,6330.267Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas0.8071.000.8070.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.267Wetland- ---EffectiveImpervious—--0.807TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:31oF142- I02/02/2012SouthBusArea—InfiltrationTrench#5StageElevationStorageDischargePercolation(if)(ft)(cu.if)(ac—fr)(cfs)(cfs)0.000.000.0.0000.0000.170.270.2730.0.0010.0000.170.530.5359.0.0010.0000.170.800.8089.0.0020.0000.171.071.07118.0.0030.0000.171.331.33147.0.0030.0000.171.601.60177.0.0040.0000.171.871.87207.0.0050.0000.172.132.13236.0.0050.0000.172.402.40266.0.0060.0000.172.672.67296.0.0070.0000.172.932.93324.0.0070.0000.173.203.20354.0.0080.0000.173.473.47384.0.0090.0000.173.733.73413.0.0090.0000.174.004.00443.0.0100.0000.174.274.27473.0.0110.0000.174.534.53502.0.0120.0000.174.804.80531.0.0120.0000.175.075.07561.0.0130.0000.175.335.33590.0.0140.0000.175.605.60620.0.0140.0000.175.875.87650.0.0150.0000.176.136.13679.0.0160.0000.176.406.40709.0.0160.0000.176.676.67738.0.0170.0000.176.936.93767.0.0180.0000.177.207.20797.0.0180.0000.177.477.47827.0.0190.0000.177.737.73856.0.0200.0000.178.008.00886.0.0200.0000.178.278.27916.0.0210.0000.178.538.53944.0.0220.0000.178.808.80974.0.0220.0000.179.079.071004.0.0230.0000.179.339.331033.0.0240.0000.179.609.601063.0.0240.0000.179.879.871093.0.0250.0000.1710.1310.131121.0.0260.0000.1710.4010.401151.0.0260.0000.1710.6710.671181.0.0270.0000.1710.9310.931210.0.0280.0000.1711.2011.201240.0.0280.0000.1711.4711.471270.0.0290.0000.1711.7311.731299.0.0300.0000.1712.0012.001328.0.0300.0000.1712.2712.271358.0.0310.0000.1712.5312.531387.0.0320.0000.1712.8012.801417.0.0330.0000.1713.0713.071447.0.0330.0000.1713.3313.331476.0.0340.0000.1713.6013.601506.0.0350.0000.17RentonECLC1.47....InfiltrationCalculationsFigure4-5 02/02/2012SouthBusArea—InfiltrationTrench#5RentonECLCInfiltrationCalculations3.30F2-Figure4-513.8713.871535.0.0350.0000.1714.1314.131564.0.03€0.0000.1714.4014.401594.0.3370.0000.1714.6714.6716:4.0.0370.0000.1714.93:4.931653.0.0350.0000.1715.2015.201683.0.0390.0000.1715.4715.471713.0.0390_ODD0.1715.7315.731741.0.0400.0000.1716.0016.001771.0.0410.0000.1716.27:6.27iso:.0.0410.0000.1716.5315.531530.0.0420.0000.1716.6016.60156G.0.0430.0000.1717.0717.071890.0.0430.0000.1717.3317.331918.0.0440.0000.1717.6017.601948.0.0450.0000.1717.8717.871978.0.0450.0000.1719.1318.132007.0.3460.0000.1718.4018.402037.0.0470.0000.1718.5718.672067.0.0470.0000.1718.9319.932096.0.0480.0000.1719.2019.202125.0.0490.0000.1719.4719.472155.0.0490.0000.1719.73:9.732164.0.0500.0000.1720.0020.002214.o.cs:0.0000.1720.1020.1022:4.0.0510.3080.1720.2020.202214.0.0510.8710.1720.3020.302214.0.0511.6000.1720.4020.402214.0.0512.3900.1720.5020.502214.0.0512.6700.1720.6020.602214.0.0512.9300.1720.7020.702214.0.0513.1600.1720.8020.802214.0.0513.3800.1720.9020.902214.0.0513.5900.1721.0021.002214.0.0513.7800.1721.1021.102214.0.0513.9700.1721.2021.202214.0.0514.1400.1721.3021.3022:4.0.0514.3:00.1721.4021.402214.0.0514.4700.1721.5021.502214.o.cs:4.6300.1721.6021.602214.0.0514.7900.17HydInflowOutflowPeakStorageTargetCaicStage61ev(Cu-Pt)(Ac—Ft)10.400.000.1920.0620.06224.0.05120.24““0.003.603.60398.0.00930.200.00Z451.45.6L0.00440.140.000.000.000.0.00050.210.002.732.73302.0.00760.12*******0.000.000.000.0.00070.10“““0.000.000.000.0.0008OZS0.000.000.000.0.000 02/02/2012SouthBusArea—InfiltrationTrench#5IFacilitydevE.tsfrdout5Inflow/OutflowAnalysisPeakInflowDischarge:PeakOutflowDischarge:PeakReservoirStage:PeakReservoir51ev:PeakReservoirStorage:0.4000.00020.0620.062214.0.051CFSat6:00onJanCFSat10:00onJanFtFtCu-FtAc-Ft9inYear89inYear8IIIFlowFrequencyAnalysisTimeSeriesFile:rdout5.tsfProjectLocation:Sea—TacThisinfiltrationtrenchmodelinfiltratescompletely,asillustratedbyzeroflowatanyofthecalculatedpeaks.IRentonECLCInfiltrationCalculationsst/ppqz.Figure4-5IIRouteTimeSeriesthroughInflowTimeSeriesFileOutflowTimeSeriesFileI———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks——RankReturnProb(CFS)(CFS)(ft)Period0.000410/01/000:000.00019.891100.000.9900.000510/01/010:000.0005.79225.000.9600.000610/01/020:000.0002.62310.000.9000.000710/01/030:000.0000.0045000.8000.000310/28/0419:000.0000.0053.000.6670.000810/01/050:000.0000.0062.000.5000.000210/26/063:000.0000.0071.300.2310.00011/09/0810:000.0000.0081.100.091ComputedPeaks0.00015.1950.000.960 02/02/2012SouthBusArea—InfiltrationTrench#5FlowDurationfromTimeSeriesFile:rdout5.tsfCutoffCountFrecuenDyCDFExceedenceProbabilityCFS3.00061320100.300100.0000.0000.000E±000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+0C0.00000.000100.0000.0000.000E+003.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E--000.30000.000100.0000.0000.000E—000.00000.000100.0000.000D.000E+000.00000.000100.0000.0000.000E÷000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.030E+D00.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000:—CO0.00000.000100.0000.000D.000E+000.00000.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E÷000.00000.000100.0000.000D.000E+DO0.00000.000100.0000.0CC0.000:+000.00000.0cc:oc.ooo0.0000.000:—co99999.9900.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E+0D0.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E000.30000.000100.0000.000C.000E±C00.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E+000.00000.000100.0000.0000.0005+000.00000.030100.0000.0000.000:4000.00000.000:oo.ooo0.000o.000s+oo0.00000.000100.0000.0000.000E÷000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.0005+0099999.9900.000100.0000.0000.0005+00Duetotheminisculethresholdswithinthisparticularinfiltrationtrenchmodel,KCRTScouldnotcalculateorplotadurationcomparison.RentonECLC3’5OF4tInfiltrationCalculationsFigure4-5 04/13/2012KCRTSOUTPUTOftsitePlayground—InfiltrationTrench#6IFlowFrequencyAnalysisTimeSeriesFile:pre6.tsfProjectLocation:Sea—TacFlowFrequencyAnalysisTimeSeriesFile:dev6.tsfProjectLocation:Sea—TacRetention/DetentionFacilityTypeofFacility:FacilityLength:FacilityWidth:FacilityArea:EffectiveStorageDepth:Stage0Elevation:StorageVolume:VerticalPermeability:PermeableSurfaces:BottomRiserHead:RiserDtameter:TopNotchWeir:NoneOutflowRatingCurve:NoneIIIIRentonECLCInfiltrationCalculationsFigure4-5———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRanklimeofPeak——Peaks-—RankReturnProbICES)(CFS)Per:od0.000310/08/007:000.0011100.000.9900.000411/19/012:000.001225.000.9600.00123/06/0319:000.000310.000.9000.00051/17/0415:000.00045.000.8000.000610/28/0417:000.00053.000.6670_ODD710/27/0511:000.00062.000.5000.000810/25/062:000.00071.300.2310.00111/08/081:000.00081.100.091ConputedPeaks0.00150.000.990———AnnualPeakFlowRates———FlowFrequencyAnalysisFlowRateRankTimeofPeak——Peaks—-RankReturnProb(015)(CFS)Period0.16062/09/012:000.3141100.000.9900.13681/05/0216:000.232225.000.9600.19132/27/037:000.191310.000.9000.15978/26/042:000.18945.000.8000.189410/28/0416:000.16653.000.6670.16651/18/0616:000.16062.000.5000.232210/26/060:000.15971.300.2310.31411/09/086:000.13681.100.091ComputedPeaks0.28650.000.980TrenchGravelInfiltration60.00ft5.00ft300.sq.ft20.00ft0.00ft1800.cu.ft3.00mm/in20.0012.00ftinches KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:4/13/2012BasinName:lnfDtrationTrench6PredevelopedFileName:PRE6Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassOffsitePlaygroundDutwashForest34,8080.799QutwashPastureQutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForest0.799DutwashPastureOutwashGrassWetland——EffectiveImpervious—--TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition.370pq2- KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:4/13/2012BasinName:InfiltrationTrench6DevelopedFileName:DEV6Region:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreageTillForestTillPastureTillGrassQutwashForestOutwashPasturePerviousAreasOutwashGrass6,9620.160Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas0.6391.000.6390.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestDutwashPastureOutwashGrass0.160Wetland—--EffectiveImpervious----0.639TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:Additionalplaygroundareaassumedtobe80%impervious.IIIIIIIIII 04/13/2012OffsitePlayground—InfiltrationTrench#6StageE1evatcnStorageDischargeFercolaticn(if)(if)(cu.if)(ac—if)(cis)(cfs)3.000.30C.0.0003.0003.140.270.2724.0.0010.0000.140.530.5348.o.oo:0.0000.140.600.8072.0.0020.0000.141.071.0795.0.0020.0000.141.331.33120.0.0030.0000.141.601.60144.0.0030.0000.141.871.87168.0.0040.0000.142.132.13192.0.0040.0000.142.402.40216.0.0050.0000.142.672.67240.0.0060.0000.142.932.93264.0.006.0C00.143.203.20298.0.0070.0000.143.473.47312.0.0070.000CZ13.733.73336.0.0080.0000.144.004.00360.0.0080.0000.144.274.27384.0.0090.0000.:44.534.53408.3.0090.0000Z44.du4.804.2.0.0.00.0005.075.07456.0.0100.0000.145.335.33480.0.0110.0000.145.605.60504.0.0120.0000.145.875.87528.0.0120.0000.146.136.13552.0.0130.0000.146.406.40576.0.0130.0000.146.676.67600.0.0140.0000.146.936.93624.0.0140.0000.147.207.20648.0.0150.0000.147.477.47672.0.0150.0000.147.737.73696.0.0:53.0000.148.008.00720.0.0170.0000.148.278.27744.0.0170.0000.148.538.53768.0.0180.0000.145.808.80792.0.0180.0000.149.079.07816.0.0190.0000.149.339.33840.0.0190.0000.149.609.60864.0.0200.0000.149.879.87888.0.0200.0000.1410.1310.13912.0.0210.0000.1410.4010.40936.0.0210.0000.1410.6710.67960.0.0220.0000.1410.9310.93984.0.0230.0000.1411.2011.201008.0.0230.0000.1411.4711.471032.0.0243.0000.1411.7311.731056.0.0240.0000.1422.0012.001080.0.0250.0000.14:2.2712.271104.0.0250.0000.1412.53:2.53:128.0.0260.0000.1412.80:2.601:52.0.0260.0000.14:3.0713.071175.0.0270.0000.1413.3313.331200.0.0280.0000.1413.6013.601224.0.0280.0000.14RentonECLC3’?OP1iInfiltrationCalculationsFigure4-5 04/13/2012OftsitePlayground—InfiltrationTrench#613.8713.871248.0.0290.0000.1414.1314.131272.0.0290.0000.1414.4014.401296.0.0300.0000.1414.6714.671320.0.0300.0000.1414.9314.931344.0.0310.0000.1415.2015.201368.0.0310.0000.1415.4715.471392.0.0320.0000.1415.7315.731416.0.0320.0000.1416.0016.001440.0.0330.0000.1416.2716.271464.0.0340.0000.1416.5316.531488.0.0340.0000.1416.8016.801512.0.0330.0000.1417.0717.071536.0.0350.0000.1417.3317.331560.0.0360.0000.1417.6017.601584.0.0360.0000.1417.8717.871608.0.0370.0000.1418.1318.131632.0.0370.0000.1418.4018.401656.0.0380.0000.1418.6718.671680.0.0390.0000.1418.9318.931704.0.0390.0000.1419.2019.201728.0.0400.0000.1419.4719.471752.0.0400.0000.1419.7319.731776.0.0410.0000.1420.0020.001800.0.0410.0000.1420.1020.101800.0.0410.3080.1420.2020.201800.0.0410.8710.1420.3020.301800.0.0411.6000.1420.4020.401800.0.0412.3900.1420.5020.501800.0.0412.6700.1420.6020.601800.0.0412.9300.1420.7020.701800.0.0413.1600.1420.8020.801800.0.0413.3800.1420.9020.901800.0.0413.5900.1421.0021.001800.0.0413.7800.1421.1021.101800.0.0413.9700.1421.2021.201800.0.0414.1400.1421.3021.301800.0.0414.3100.1421.4021.401800.0.0414.4700.1421.5021.501800.0.0414.6300.1421.6021.601800.0.0414.7800.14HydInflowOutflowPeakStorageTargetCabStageSlev(Cu—Ft)(Ac—Ft)0.310.000.1420.0520.051800.0.04120.230.005.175.17465.0.01130.19*******0.003.293.29296.0.00740.14*******0.000.020.022.0.00050.08***w***0.000.000.000.0.00060.080.000.000.000.0.00070.120.000.000.000.0.00080.150.000.030.033.0.000RentonECLCInfiltrationCalculationsFigure4-5 04/13/2012OffsitePlayground—InfiltrationTrench#6RouteTimeSeriesthroughFacilityInflowTimeSeriesFile:dev6.tsfOutflowTimeSeriesFile:rdout6Inflow/OutflowAnalysisPeak:nflowDischarge:0.313CFSat6:00onJan9inYearSPeakOutflowDischarge:0.000CE’Sat10:00onJan9inYear8PeakReservoirStage:20.05FtPeakReservoirElev:20.05FtPeakReservoirStorage:1800.Cu—Ft0.041Ac-FtFlowFrequencyAnalysisTimeSeriesF1e:rdout6.tsfProjectlocation:Sea—Tac———AnnualPeakFlowRates———FlowFrecuencyAnalyscFlowRateRankTimeofPeak-—Peaks--RankReturnProb(CE’S)(CE’S)(ft)Period0.000410/01/000:000.00019.981100.000.9900.000510/01/010:000.0005.17225.000.9600.000610/01/020:000.0001.42310.000.9000.003713/01/030:000.0000.0045.000.8000000310/28/0419:000.0000.0053.000.6570.000910/01/050:000.0000.0062.000.5030.000210/25/063:000.0000.0071.300.2310.00011/09/0810:000.0000.0081.100.091ComputedPeaks0.00015.0450.000.980Thisinfiltrationtrenchmodelinfiltratescompletely,asillustratedbyzeroflowatanyofthecalculatedpeaks.kentonECLCInfiltrationCalculationsFigure4-5 04/13/2012OffsitePlayground—InfiltraUonTrench#6FlowDurationfromTimeSeriesFile:rdout6.tsfCutoffCountFrequencyCDFExceedenceProbabilityCFS0.00061320100.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+0D99999.9900.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+000.00000.000100.0000.0000.000E+0099999.9900.000100.0000.0000.000E+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+000.00000.000100.0000.0000.0005+0099999.9900.000100.0000.0000.000E+00Duetotheminisculethresholdswithinthisparticularinfiltrationtrenchmodel,KCRTScouldnotcalculateorplotadurationcomparison.RentonECLCql0Fq2—InfiltrationCalculationsPigure4-5 01/17/2012SouthBusArea—RaingardenAWesternWashingtonHydrologyModelPROJECTREPORTProjectName:SouthBusAreaSiteAddress:CityReportDate:1/17/2012Gage:SeatacDataStart:1948/10/01DataEnd:1996/09/30PrecipScale:1.00c:iV3ProVersion:PREDEVELOPEDLANDUSEName:SouthBusAreaBypass:NoGround?ater:NoPerviousLandUseAcresC,Lawn,Flat.122ImperviousLandUseAcresROADSFLAT0.952ElementFlowsTo:SurfaceinterfiowGroundwaterDEVELOPEDBASINName:SouthBusAreaBypass:IcoGroundWater:NoPerviousLandUseAcresC,Lawn,Fiat.267ImperviousLandUseAcresROADSFLAT0.307EiementFlowsCc:SurfaceInterfiowGrounowaterRaingarden5,Raingarden5,RentonECLCOF31WaterQualityCalculationsFigure4-6 01/17/2012SouthBusArea—RaingardenAIFacilityNameDownstreamConnectionFacilityTyperPie4ii&ionAppedtoFackyFacilityBottomElevation(ft)1PFacilityDimensionsTrenchLengthTrenchBoftomEUecUveTotalDepthBottomslopeoE’TrenchL&tSieSbpeRiitSideSlopeMaterialLayersforLayerlfl*kness(ft)Layer1porosityLayer2TltknenFtJLayer2porosityLayer3TFicknen(U)Layer3paosIyRentonECLCWaterQualityCalculationsOutletStructureRiserH&,tfft)11.75HRismDisne1ei()usHRiserTypeIFlat—HNotchTweTienchVoknatRiseHead(aae4t).023Pondlnaemthloin—HShowPondTablelopenTaLkHTotalVobreTln4iFac(aae.ft)Pe.cedN*rated1Raingarden5Mitigated________________________________lRâioden5....:Outlet1Outlet20•....fltT.‘I..,QuickTrenthI9fjekwOutlet3liIIIIIIIOrificeDiameterHeiqhtOMaxNumber(In)(Ft)(ds)11°*oHa2$0HIoHa310HIoHUInfiltrationhisHMeasuedIrarationRatefmñi)1-!4ic1FD&rAbnFedarUseWettedSt4aceAsea(sidewab)TotalVobneIr,Jtateraae-tt)Tc1alVthsnefln4iRist[aae-ft)I?HI’HoH114,4456.853I121.X49435Requiredraingardenarea=900SF<2,911SFbottomareaprovidedonplans.Layer1thickness=18”soil.Layer2thickness=3”ponding+3”freeboard.Percentinfiltrated94.35>91%waterqualityrequirement.GravelTrenchBedHydraulicTableStage(ft)Areaacr)Volurne(acr—ft)Dschrg(cfs)Infi1tcfs)0.0000.0210.0000.0000.0000.0220.0210.0000.0000.0420.0440.0210.0000.0000.0420.0670.0210.0010.0000.0420.0890.0210.0010.0000.0420.1110.0210.0010.0000.0420.1330.0210.0010.0000.0420.1560.0220.0010.0000.0420.1780.0220.0020.0000.0420.2000.0220.0020.0000.0422-OF”)?-Figure4-6 01/17/2012SouthBusArea—RaingardenA0.2220.0220.0020.0000.0420.2440.0220.0020.0000.0420.2670.0220.0020.0000.0420.2890.0220.0020.0000.0420.3110.0220.0030.0000.0420.3330.0220.0030.0000.0420.3560.0230.0330.0000.3420.3780.0230.0330.3000.0420.4000.0230.0030.3000.0423.4220.0133.0040.3000.0420.4443.0230.0040.3000.0420.4670.0230.0040.0000.0420.4890.0230.0040.0000.0420.5110.0230.0050.0000.0420.5330.0240.0050.0000.0420.5560.0240.0050.0000.0420.5780.040.0050.0000.0420.6000.0240.0050.3033.3423.6:20.0240.0360.3003.0420.6440.0240.0060.0000.0420.6670.0240.0060.0300.C423.6830.0240.0060.0300.0420.7110.0250.0060.0000.0420.7330.0250.0070.0000.0420.7560.0250.0070.0000.0420.7780.0250.0070.0000.0420.8000.0250.0070.0000.0420.8220.0250.0080.0000.0423.8440.0250.0080.0030.0420.8670.0250.0080.3030.0420.6890.0250.3060.0003.0420.9113.0260.3080.0000.0420.9330.0260.0090.0000.0420.9560.0260.0090.0000.0420.9780.0260.0090.0000.0421.0000.0260.0090.0000.0421.0220.0260.0100.0000.0421.0440.0260.0100.0000.0421.0570.0270.0200.0300.0421.0893.0273.0100.0030.0420.3270.0110.0000.0421.1330.0270.0fl0.3000.0421.1553.027cc::0.3000.0421.1780.0270.0110.0000.0421.2000.0270.0120.0000.0421.2220.0270.0120.0000.0421.2440.0280.0120.0000.0421.2670.0280.0120.0000.0421.2890.0280.0120.0000.0421.3110.0260.0130.0300.0421.3330.0280.0130.0000.042..3560.0280.0.30.0000.0421.3780.0280.0130.0000.0421.4000.0280.0140.0000.0421.4220.0280.0140.0000.0421.4440.0290.0140.0000.0421.4670.0290.0140.0000.042RentonECLC3OF32-WaterQualityCalculationsFigure4-6 I01/17/2012SouthBusArea—RaingardenA1.4890.0290.0150.0000.0421.5110.0290.0150.0000.0421.5330.0290.0160.0000.0421.5560.3290.0170.000C.C421.5763.0290.0170.0030.0421.0000.0290.0180.3300.0421.6220.0330.0:90.0000.3421.6440.0300.0190.0000.0421.6670.3303.0230.0000.0421.6890.0300.0220.0030.3421.71:0.0330.0210.3300.342.7333.0300.0220.0000.0421.7560.0300.0230.0060.0421.7780.0300.0230.0680.0421.8000.0310.0240.1630.0421.8220.0310.3250.2840.0421.8440.0310.0250.4240.0421.8670.0310.0260.5820.0421.8890.0310.0270.7560.0421.9110.0310.0270.9450.0421.9330.0310.0281.1470.0421.9560.0310.0291.3610.0421.9780.0320.0301,5880.0422.0000.0320.0301.8260.042MITIGATEDLANDUSEANALYSISRESULTSFlowFrecuencyReturnPeriodsforPredeveloped.FCCReturnEertoaF1ow’cfs2year3.2434_35year0.2372810year0.33220925year0.37590350year0.408295100year0.440655FlowFrequencyReturnPeriodsforMitigated.P00#1ReturnPeriodFlow(cfs)2year0.1613935year0.21283910year0.22508225year0.23071550year0.232139100year0.232707YearlyPeaksforPredevelopedandMitigated.FCCYearPredevelopedMitigated19500.2510.18119310.3660.25919320.2453.17713530.2143.fl919540.1940.07519550.2320.077RentonECLCHOF3’ZWaterQualityCalculationsFigure4-6 01/17/2012SouthBusArea—RaingardenA19560.2480.16719570.2390.14519580.2730.18019590.2460.11619600.1890.12219610.2370.160196:0.2063.034:9630.21:3.073:9640.2023.07719650.2403.39619560.2:40.13319670.2130.12019680.3200.19819693.3610.09819703.1940.12519710.2130.14819720.2060.1279730.2330.21319743.1940.09C19753.2140.056:9760.2840.183:977o.:943.13319780.2460.05919790.3180.23219833.3130.06619310.2640.17119820.2930.16319830.1010.312:9843.2320.187.9853.2213.36319953.2390.14019870.2600.18819880.3640.23919890.1740.08419900.2180.00319913.4100.33219920.3823.29319930.2203.14713940.1510.06319953.1790.000:9960.2260.138:9970.2680.19319330.2580.13819990.2780.115RankedYearlyPeaksforPredevelopedandMitigated.FCC#1RankPredevelopedMitigated10.43950.33160.40120.311830.38230.298140.36633.258850.36380.231960.36060.213470.32010.209080.31750.197690.31340.1927RentonECLCSOFZWaterQualityCalculationsFigure4-6 I01/17/2012SouthBusArea—RaingardenA100.29770.18770.2927o.:866120.292:0.1855130.28370.1806140.27800.1800:s0.27320.:765160.26830.1738170.26440.1666180.26020.1630190.25780.1604200,25060.1485210.24800.1469220.24620.1446230.24550.1397240.24460.1375250.23990.1329260.23860.1267270.23660.1249280.23200.1220’290.22570.1139300.22140.1186310.22003.1157320.21790.::47330.21430.1084340.2:430.1026350.21380.0984360.21310.0959370.21280.0903380.21120.0844390.23900.0838400.20640.0767410.20610.0766420.20240.0755430.19430.0732440.194.0.0585450.19390.0678460.13330.0652470.18880.0592480.17930.3563490.17360.0032503.15060.0303FCC#1TheFacilityPASSEDTheFacilityPASSED.Flow(CFS)PredevDcvPercentagePass/Fail0.1217000Pass0.1246000Pass0.1275‘330Pass0.1334000Pass0.1333C00Pass0.1362C00Pass0.1191000Pass0.1420000PassRentonECLCWaterQualityCalculationsFigure4-6 01/17/2012SouthBusArea—RaingardenA0.1449000Pass0.1478000Pass0.1507000Pass0.1536000Pass0.1564000Pass0.1593000Pass0.1622000Pass0.1651000Pass0.1680000Pass0.1709000Pass0.1738000Pass0.1767000Pass0.1796000Pass0.1825000Pass0.1854000Pass0.1883000Pass0.1912000Pass0.1941000Pass0.1970000Pass0.1999000Pass0.2028000Pass0.2057000Pass0.2086000Pass0.2114000Pass0.2143000Pass0.2172000Pass0.2201000Pass0.2230000Pass0.2259000Pass0.2288000Pass0.2317000Pass0.2346000Pass0.2375000Pass0.2404000Pass0.2433000Pass0.2462000Pass0.2491000Pass0.2520000Pass0.2549000Pass0.2578000Pass0.2607000Pass0.2636000Pass0.2665000Pass0.2693000Pass0.2722000Pass0.2751000Pass0.2780000Pass0.2809000Pass0.2838000Pass0.2967000Pass0.2896000Pass0.2925000Pass0.2954000Pass0.2983000Pass0.3012000Pass0.3041000Pass0.3070000PassRentonECLC7oF31WaterQualityCalculationsFigure4-6 I01/17/2012SouthBusArea—RaingardenA0.3099000Pass0.3128000Pass0.3157000Pass0.3186000Pass0.3215000Pass0.3243000Pass0.3272000Pass0.3301000Pass0.3330000Pass0.3359000Pass0.3388000Pass0.3417000Pass0.3446000Pass0.3475000Pass0.3504000Pass0.3533C03Pass0.3562300Pass0.359100CPass0.36200CCPass0.36490C0Pass3.35780C0Pass3.3707030Pass3.3736C00Pass0.3765000Pass0.3753C00Pass0.382200Pass0.355:C0Pass0.36800CCPass0.3905000Pass0.3538000Pass0.3557000Pass0.3995000Pass0.4325000Pass0.4054000Pass0.4383C00PassWaterCual:yBMPFlowandVcluneforPOCI.On—linefacoirtyvolume:0acre—feetOn—linefacilitytargetflow:0dr.Ad:ustedfor15mit:0cfs.Off—Irmafaorlrytargetflow:0cfs.Adoustedfor15nit:0cfs.Thisprogramandaccompanyingdocumentationisprovided‘as—is’withoutwarrantyofanykind.Theentireriskregardingtheperformanceandresultsofthisprogramisassumedbytheuser.ClearCreekSolutionsandtheWashingtonstateDepartmentofEcologydisclaimsallwarranties,eitherexpressedorimplied,includingbutnotlimitedtoimpliedwarrantiesofprogramandaccompanyingdocumentation.InnoeventshallClearCreekSolutionsand/ortheWashingtonStateDepartmentofEcologybeliableforanydamageswhatsoever(includingwithoutlimitationtodamagesforlossofbusinessprofits,lossofbusinessinformation,businessinterruption,andthelike)arisingoutoftheuseor,orinabilitytousethisprogramevenifClearCreekSolutionsortheWashingtonstateDepartmentofEcologyhasbeenadvisedofthepossibilityofsuchdamages.Q:\2010\210515\1O_CIV\NON.CAD\CALCS\SouthBusArea\Raingarden5Output,doRentonECLCeoF32-WaterQualityCalculationsFigure4-6 01/17/2012MainParkingLot—RaingardenBWesternWashingtonHydrologyModelPROJECTREPORTProjectName:MainParkingLotSiteAddress:CityReportDate1/17/2012Gage:SeatacDataStart1948/10/01DataEnd:1998/09/3DPrecipScale:1.00WWMM3ProVersion:PREDEVELOPEDLANDUSEName:I’lainParkingLotBypass:NoGroundwater:NoPerviousLandUseAcresC,Lawn,Flat.168ImperviousLandUseAcresROADSFLAT1.208ElementFlowsTo:SurfaceInterflowGroundwaterDEVELOPEDBASINName:MainParkingLotBypass:NoGroundwater:NoPerviousLandUseAcresC,Lawn,Flat.295ImperviousLandUseAcresROADSFLAT1.082ElementFlowsTo:SurfaceInterflowGroundwaterRaingarden4,Raingarden4,RentonECLCWaterQualityCalculationsFigure4-6 01/17/2012MainParkingLot—RaingardenBIRentonECLCWaterQualityCalculationsI%•Raingarden4Mitigated________________Rigaden4Outlet1OutIet210IPr&dTièn&d8edOutlet311°______QuickTrenchIFacilityName________DownstreamConnectionFacilityTypeFPrecçitatgAppbedtoFaciyv?UFacilityBottomElevation(if)[aj4;;,FacilityDimensionsTrenchLengthTrenchBottomWidthEffectiveTotalDepthBottomslopeofTrenchLeftSideSlopeRightSideSlopeMaterialLayersforLayer1Thickness(It)Layer1porosityLayer2Thickness(It)Layer2porosityLayer3Thickness(It)Layer3porosityOutletStructureRisesHeight(H)11.75HRiserDineterfri)[18HRiserTypeIFlatHNotchTypeIIIIIIIOrificeNumber23DiameterHeightOMax(In)(Ft)(c(s)to*°_HOloHIoHOto-&BoHOInfiltrationIVESHMeasuredInMiationRateIn/h)kiIraUonRethdionFactorUseWettedStilacekea[sidewals)TotalVobneInflbate4acre1t)TotalVobneThoughRise4aae-ft)TrenchVoksneatRiserHead(ecrelt).030Poradlncwmedlola-HShowPondTablelopenTableH12HIi-HINOH1581368.877TotalVokxneThoughFadilyfacre1t)PercentIrfi&aked158.8138454Requiredraingardenarea=1,225SF<4,904SFcombinedbottomareaprovidedonplans.Layer1thickness=18”soil.Layer2thickness=3”ponding+3”freeboard.Percentinfiltrated=94.54>91%waterqualityrequirement.GravelTrenchBedHydraulicTableStae(ft)Area(acr)Vo1umeacr—ft)Dschrq(cfs)nfiit{cfs)0.0000.0280.0000.0000.3000.0220.0280.0300.0000.3570.0440.0280.0010.0000.3570.0670.0293.0010.3000.3570.0890.0293.0010.3000.0570.1110.0290.0010.0000.0570.1330.0290.0020.0000.0570.1560.0290.0020.0000.0570.1780.3290.0020.0000.057IIIIIIIFigure4-6 01/17/2012MainParkingLot—RaingardenB0.2000.0293.0020.0000.3570.2220.0300.3030.0CC0.057C.2440.0300.0030.0000.0570.2670.0303.0030.0000.0570.2890.0300.0030.0000.0570.3110.0300.0040.0000.0570.3330.0300.0040.0000.0570.3560.0300.0040.0000.0570.3780.0310.0040.0000.0570.4000.0310.0050.0000.0570.4220.0310.0050.0000.0570.4440.0310.0050.0000.0570.4670.0310.0060.0000.0570.4890.0310.0060.0000.0570.5110.0313.0060.0000.0570.5330.0320.0060.0000.3570.5560.0320.0070.0000.0570.5780.0320.0070.0000.0570.6000.0320.0070.0000.0570.6220.0320.0070.0000.0570.6440.0320.3080.0300.3570.6670.0320.0080.0000.0570.6890.0330.0080.0000.0570.7110.0330.0090.0000.0570.7330.0330.0090.0000.0570.7560.0330.0090.0000.0570.7780.0330.0100.0000.0570.8000.0330.0100.0000.0570.8220.0330.0100.0000.0570.8440.0340.0100.0000.0570.6670.0340.0110.0000.0570.8890.0340.0110.0003.0570.91:0.0340.0110.0003.0570.3330.0340.0120.0000.0570.9560.0340.0120.0000.0570.9780.0343.0120.0000.0571.0000.0350.0133.0000.0571.0220.0350.0130.0000.0571.0440.0350.0130.0000.0571.0670.0350.0130.0000.0571.0890.0350.0140.0000.0571.1110.0350.0140.0000.0571.1330.0350.0140.0000.0571.1560.0360.0150.0000.0571.1780.0360.0150.0000.0571.2000.0360.0150.0000.0571.2220.0360.0160.0000.0571.2440.0360.3160.0000.0571.2670.0360.0160.0000.0571.2890.0360.0170.0000.0571.3110.0370.0170.0000.0571.3330.0370.0170.0000.0571.3560.0370.0180.0000.0571.3760.0370.0160.0030.0571.4000.0370.0180.0000.0571.4220.0370.0190.0000.0571.4440.0370.0190.0000.057RentonECLCWaterQualityCalculationsFigure4-6 I01/17/2012MainParkingLot—RaingardenB1.4670.0360.0190.0000.0571.4690.0380.0200.0000.0571.5110.0380.0200.0000.0571.5330.0360.0210.0000.0571.5560.0380.0220.0000.0571.5760.0360.0230.0000.0571.6000.0380.0240.0000.0571.6220.0390.0250.0000.0571.6440.0390.0260.0000.0571.6670.0390.0260.0000.0571.6690.0390.0270.0000.0571.7110.0390.0280.0000.0571.7330.0390.0290.0000.0571.7560.0390.0300.0060.0571.7760.0400.0310.0660.0571.6CC0.3400.0320.1830.0571.8220.0400.3330.2840.0571.8440.0400.0330.4240.057.8670.043C.0340.5820.0571.8680.0400.0350.7560.0571.9110.0400.03€0.9450.0571.9330.0410.0371.147Q.Q571.9560.0410.0381.36:0.0571.3780.3410.3391.5880.0572.0000.3410.0401.6260.057MITIGATEDLANDUSEANALYSISRESULTSFlowFrequencyReturnPeriodsforPredeveloped.FCCReturn?ercdF1owcfs)1year0.309493year0.378li310year0.4226325year0,47633:50year3.519633lCDyear0.560901FlowFreouencyReturnPeriodsforMitiaated.FCClReturnPeriodF1cwcfs)2year0.2060735year0.27501113year0.29288525year0.30181350year0.304288100year0.305355YearlyPeaksforPredevelopedandMitigated.FCC#1YearFredevelopedMitigated19500.3190.23619510.4670.32019520.3110.22919530.2720.15219540.2470.099RentonECLClicE‘ZWaterQualityCalculationsFigure4-6 01/17/2012MainParkingLot—RaingardenB19550.2950.09219560.3150.21319570.3030.18619580.3480.23619590.3130.15319600.2400.15419610.3310.21319623.2620.11319630.2680.097:9640.2570.099:9650.3050.12219660.2720.13619670.2710.15119680.4070.24419690.4580.13119700.2470.16319710.2710.19813720.2620.16419730.3793.27919740.2470.118:9753.2720.05913760.36:0.23819770.2470.17519780.3120.07819790.4030.30619800.3980.08219810.3360.21319820.3720.19815830.5100.408:9840.3710.24719250.2810.088198E0.2650.18519870.3310.24319830.4620.27619890.2200.11119900.2760.00519910.5220.43319920.4870.38919930.2800.132:9940.19:3.38919950.2280.00019960.2870.13819970.3420.25:19930.3280.17819990.3530.152RankedYearlyPeaksforPredevelopedandMitigated.P00#1RankPredevelooedMitigated0.52190.433120.51040.408330.38690.389040.46693.320350.46190.305960.45830.278870.40690.275680.40310.2505RentonECLCL3oF3ZWaterQualityCalculationsFigure4-6 I01/17/2012MainParkingLot—RaingardenB90.39790.2475I:00.37880.2444110.37220.24340.37:00.2384150.56110.2364140.35340.2359150.34760.290160.34210.2162170.33640.2134180.33130.2134190.32810.1982200.31890.1980210.31520.1923220.31300.1864230.fllS0.1682240.31150.1782250.33510.1752260.30330.1635270.33130.1631230.29530.1545290.15680.1525300.23150.1521310.27970.1517320.27650.1507330.27220.1380340.27200.1356350.27200.1306360.27090.1222370.27050.1185380.26830.1128390.26550.1109403.26250.3994410.26190.3935420.25740.3969430.24710.3322440.24670.3896453.24670.0693460.24650.0817470.24000.0777480.22760.0691490.22020.0046500.19130.00008CC141TheFacilityPASSEDTheFaoilttvflow(CFS)Predev3evPercentagePass/Fail0.1547000Pass0.1584300Pass0.12l000Pass0.1558000Pass0.1695000Pass0.1732000Pass0.1769000PassRentonECLCK-IoF32-WaterQualityCalculationsFigure4-6 01/17/2012MainParkingLot—RaingardenB0.1805000Pass0.1842000Pass0.1879000Pass0.1916000Pass0.1953000Pass0.1990000Pass0.2027000Pass0.2063000Pass0.2100000Pass0.2137000Pass0.2174000Pass0.2211000Pass0.2248000Pass0.2285000Pass0.2321000Pass0.2358000Pass0.2395000Pass0.2432000Pass0.2469000Pass0.2506000Pass0.2543000Pass0.2579000Pass0.2616000Pass0.2653000Pass0.2690000Pass0.2727000Pass0.2764000Pass0.2801000Pass0.2837000Pass0.2874000Pass0.2911000Pass0.2948000Pass0.2985000Pass0.3022000Pass0.3059000Pass0.3095000Pass0.3132000Pass0.3169000Pass0.3206000Pass0.3243000Pass0.3280000Pass0.3317000Pass0.3353000Pass0.3390000Pass0.3427000Pass0.3464000Pass0.3501000Pass0.3538000Pass0.3575000Pass0.3611000Pass0.3648000Pass0.3685000Pass0.3722000Pass0.3759000Pass0.3796000Pass0.3833000Pass0.3869000PassRentonECLC16°FzWaterQualityCalculationsFigure4-6 101/17/2012MainParkingLot—RaingardenB0.3906000Pass0.3943000Pass0.3980000Pass0.4017000Pass0.4054000Pass0.4091000Pass0.4127000Pass0.4164000Pass0.4201000Pass0.4238000Pass0.4275000Pass0.4312000Pass0.4349000Pass0.4385000Pass0.4422000PassC.44590C0Pass3.4496CC0Pass0.4533000Pass0.4570300Pass0.4607300Pass0.1643000Pass0.4660030Pass0.4717030Pass3.4754030PassC.479:000Pass0.4828003Pass0:486500CPass0.49010C0.Pass0.4938000Pass0.4975300Pass0.5012000Pass0.5249030Pass0.5386030Pass0.5:23000Pass0.5159000Pass3.51960C0PassWaterQualityEMPFlowandVolumeforFCC1.Cn—i:nefarl:tvvolume;0acre—feetDn—1nefacilrvtaroetflow:0ifs.Ad,stedfor15mm:0ifs.Cff—iinefacrltytargetflow:0ifs.Adjustedfor15mm:0cfs.Thisprogramandaccompanyingdocumentationisprovided‘as—is’withoutwarrantyofanykind.Theentireriskregardingtheperformanceandresultsofthisprogramisassumedbytheuser.ClearCreeksolutionsandtheWashingtonStateDepartmentofEcologydisclaimsallwarranties,eitherexpressedorimplied,includingbutnotlimitedtoimpliedwarrantiesofprogramandaccompanyingdocumentation.InnoeventshallClearCreeksolutionsand/ortheWashingtonstateDepartmentofEcologybeliableforanydamageswhatsoever(includingwithoutlimitationtodamagesforlossofbusinessprofits,lossofbusinessinformation,businessinterruption,andthelike)arisingoutoftheuseof,orinabilitytousethisprogramevenifclearcreekSolutionsortheWashingtonstateDepartmentofEcologyhasbeenadvisedofthepossibilityofsuchdamages.Q:\20l0\2105l5\l0_CIV\NON_CAD\CALCS\MainParkingLot\Raingarden4Output.doRentonECLCILPOF32.WaterQualityCalculationsFigure4-6 01/17/2012NorthBusArea—RaingardenCWesternWashingtonHydrologyModelPROJECTREPORTProjectName:NorthBusAreaSiteAddress:CityReportDate:1/17/2012Gage:SeatacDataStart:1948/10/ClDataEnd:1998/09/3DPrecipScale:1.00WWhM3ProVersion:PREDEVELOPEDjqUSEName:NorthBusAreaBypass:NoGroundWater:NoFerviousLandUseAcresC,Lawn,Flat.702ImperviousLandUseAcresROADSFLAT0.135ElementFlowsTo:SurfaceInterflowGroundwaterDEVELOPEDBASINName:NorthBusAreaBypass:NoGroundWater:NoPerviousLandUseAcresC,Lawn,Flat.22ImperviousLandUseAcresROADSFLAT0.618ElementFlowsTo:SurfaceInterflowGroundwaterRaingarden3,Raincarden3,RentonECLC!7oF9ZWaterQualityCalculationsFigure4-6 01/17/2012NorthBusArea—RaingardenCII—-FacilityBottomElevation(if)FacilityDimensionsTrenchLengthTrenchBotomWdlhEffediveTOtalDepthBo{tomshpedTrenchLeftSideSlopeRightSideSlopeMaterialLayersforLaym1TFkIo,ess(II)Lay1powsslyLpe2Tltknessfit)L’er2pezodyLayes3Tlicknessfit)Layer3porosityInfiltrationiVESHMeasuredWiltrationRate(&h)WiKsaUonReductionFactorUseWettedSislaceArea(sidewas)TOtalVoêsnelrasate4aae4t)TotalVoknThroughRiser[aae4t)Requiredraingardenarea=625SFplans.Layer1thickness=18”soil.OutletStructureRiserHehtUt)hisHRisesDiameffi4in)118HRiserTypeIFlat—HNotchTypeTotalVokineTFw4iFaciy(acte1t)PercentIthtialedOMax(ds)000GravelTrenchBedHydraulicTableArea(acr)Volume(acr—ft)Dschrg(cfs)Infilt(cfs)0.0140.0000.0000.0000.3140.3000.3000.0290.0150.OOC0.0000.0290.015O.COC0.0000.0290.0150.0010.0000.329o.o:s0.0010.0000.029o.o:s0.0310.C000.3290.0150.0010.0000.0290.0150.0010.0000.029FacilityNameaRaingarden3Mitigated______________Outlet1Outlet2I;.IDownstreamConnection0_JJ0.£1,110FacilityTypeTrenchMedrJ%çmaaoriAppkedtoPajnoutdThrenchI_____________________________-Ji%j5t10..IOutlet3IonhNumber123DiameterHeight(In)(Ft)In._Jin-JJV.flV102-HIiHINOH87.2286.595TrenchVolumeatRiserHead(aaelt).016PondIncrementfiTiiHShowPondTableIopenThbleH83.82392.97<1,355SFcombinedbottomareaprovidedon1IIIIIIIIIIIILayer2thickness=3”ponding+3”freeboard.Percentinfiltrated=92.97>91%waterqualityrequirement.Stage(ft)0.0000.022C.0670.0890.111C.1330.1560.178RentonECLCWaterQualityCalculationsISoF3z-Figure4-6 01/17/2012NorthBusArea—RaingardenC3.2000.025c.oo:0.0000.0290.2210.0:50.0010.0000.0290.2440.015coo:c.oco0.0290.2670.0150.301(.0000.0230.2890.0160.3020.0000.0290.3110.0160.0020.0000.0290.3330.0160.0020.0000.0290.3560.0160.0020.0000.0290.3780.0160.0020.0000.0290.4000.0160.0020.0000.0290.4220.0160.0030.0000.0290.4440.0160.0030.0000.0290.4670.0160.0030.0000.0290.4890.0170.0030.0000.0293.5113.0270.0030.0000.0293.5330.0170.0330.0000.32?0.5560.0170.0030.0000.0290.5780.0170.0040.0000.0290.6030.0170.0043.0000.0290.6223.0170.0040.0000.0290.6440.0170.0040.0000.0230.6670.0170.0040.0000.0290.6890.0180.0040.0000.0290.7110.0180.0050.0000.0290.7330.0180.0050.0000.0290.7560.0180.0050.0000.0290.7780.0180.0050.0000.0290.8000.0180.0050.0000.0290.8220.0180.0050.0000.0290.8440.0180.0060.0000.0290.8670.0180.0060.0000.0290.8330.0180.0060.0000.0230.9110.0190.0060.0000.0293.9333.0190.0350.0000.0290.9560.0190.0360.300C.C290.9780.019CODE0.0000.0291.0000.0230.3070.3300.029L0220.0190.0073.0003.0291.0440.0190.0070.0000.0291.0670.0190.0070.0000.0291.0890.0190.0070.0000.0291.1110.0190.0080.0000.0291.1330.0200.0080.0000.0291.1560.0200.0080.0000.0291.1780.0200.0080.0000.0291.2000.0200.0080.0000.0291.2220.0200.0080.0000.0291.2440.0230.0030.0000.029L2670.0230.0090.0000.02912890.0230.009C.0300.0291.3110.0200.0090.0000.0291.3330.0200.0090.0003.0291.3563.0210.0030.0000.02913790.0223.0100.0000.0291.4000.0210.0100.0000.0291.4220.0210.0100.0000.0291.4440.0210.0100.0000.029RentonECLCHoF32WaterQualityCalculationsFigure4-6 I01/17/2012NorthBusArea—RaingardenC1.4670.0210.0100.0000.0291.4890.0210.0110.0000.0291.5110.0210.0120.0000.0291.5333.0210.01200000.0291.5560.0213.0:20.0300.0291.5750.0220.0120.3000.3:90.0220.0130.0000.029.6220.0220.0130.0000.0291.6440.0220.0:40.0000.0291.6670.0220.0:40.0300.0291.6590.0220.0150.3000.3291.7:10.0220.0150.0000.0251.7330.0220.0160.0000.0291.75€0.0220.0160.0060.0291.7780.0230.0170.0680.0291.8000.0230.0170.1630.0291.8220.0230.0180.2840.0291.8440.0230.0180.4240.0291.8670.0230.0190.5820.0291.8890.0230.0190.7560.0291.9110.0230.0200.9450.0291.5330.0230.0201.1470.0291.9560.0230.0211.3610.0291.9780.0230.0211.5880.0292.0000.0240.0221.8260.029MITIGATEDLANDUSE1ANALYSISRESULTSFlcwFrecuenoyReturnPeriodscrPredeveloped.FCCReturnPeriodflow(cs)2year0.0672345year0.09336410year0.11245725year0.13868450year0.15979100year0.182278FlowFrequencyReturnPeriodsforMitigated.POC#1ReturnPeriodFlow(cfs)2year0.133255year0.15330610year0.1548225year0.15506650year0.155085100year0.143342YearlyPeaksfforPredevelopedand1itiga:ed.POCUYearPredevelopedMitigated19500.3780.14719310.1640.20819520.0320.13919530.0520.39319540.0460.07319550.0650.088RentonECLCWaterQualityCalculationsFigure4-6 01/17/2012NorthBusArea—RaingardenC19560.3760.13319570.3750.12219580.3860.14519590.3650.39319600.0480.39719610.0790.12819623.0560.98319639.C470.058:9640.0590.06619650.0683.09519660.0540.08019670.3583.10719680.3863.17519690.0880.09619700.0560.09819710.0600.11619720.0610.13219730.1120.16619740.3520.37319750.0630.35819763.0980.15019770.0600.10519780.0473.05619790.0790.18019800.0550.06519810.0830.15019823.0800.15719830.1340.249:9840.06:0Z519850.0613.35813563.0443.10619873.0960.14719880.0890.16319890.0400.06819900.0400.01619910.1760.25719920.1510.23519930.0600.11819340.0400.05713950.0313.00219360.0533.0861997o.i:0.1549383.0890.12519990.0750.078RankedYearlyPeaksforPredevelopedandMitigated.900#1RankPredevelopedMitigated10.17583.256823Z540.249030.15110.234640.13410.237650.1:200.179863.11090.175470.09320.163380.09610.162690.09190.1565RentonECLC21OF32.WaterQualityCalculationsFigure4-6 101/17/2012NorthBusArea—RaingardenC103.08930.1543113.08910.1510123.06830.1504133.05650.1502140.08630.1467150.08280.1467160.08020.1449170.07920.1392180.07880.1296190.07820.1281200.07610.1252210.07500.1221220.07450.1178230.06790.1155240.065:0.:056150.0649o.:os260.06350.0052270.06140.1024280.06080.0975290.06250.0956300.0599310.05960.0945320.05960.0929330.05880.0904340.05630.0877350.05820.0661360.05640.0826370.05460.0799380.05360.0764390.05340.0754400.05230.073141C.0590.0678420.04830.0653430.047:0.0650440.04690.0583450.04560.0579460.04430.0576470.04040.0569180.04030.0555490.03950.0157500.03110.0016IFCC#1TheFacilityPASSEDTheFacilityPASSED.Elow(CFS)Predev0evPercentagePass/Fail3.033600CPass0.034900CPass0.0362000Pass0.337400CPass0.3387000Pass0.0400000Pass0.0413000Pass0.0425000PassRentonECLCWaterQualityCalculationsFigure4-6 01/17/2012NorthBusArea—RaingardenC0.0438000Pass0.0451000Pass0.0464000Pass0.0476000Pass0.0489000Pass0.0502000Pass0.0515000Pass0.0527000Pass0.0540000Pass0.0553000Pass0.0566000Pass0.0578000Pass0.0591000Pass0.0604000Pass0.0617000Pass0.0629000Pass0.0642000Pass0.0655000Pass0.0668000Pass0.0680000Pass0.0693000Pass0.0706000Pass0.0719000Pass0.0731000Pass0.0744000Pass0.0757000Pass0.0769000Pass0.0782000Pass0.0795000Pass0.0808000Pass0.0820000Pass0.0833000Pass0.0846000Pass0.0859000Pass0.0871000Pass0.0884000Pass0.0897000Pass0.0910000Pass0.0922000Pass0.0935000Pass0.0948000Pass0.0961000Pass0.0973000Pass0.0986000Pass0.0999000Pass0.1012000Pass0.1024000Pass0.1037000Pass0.1050000Pass0.1063000Pass0.1075000Pass0.1088000Pass0.1101000Pass0.1114000Pass0.1126000Pass0.1139000Pass0.1152000PassRentonECLCjOF32WaterQualityCalculationsFigure4-6 I01/17/2012NorthBusArea—RaingardenC0.1165000Pass0.1177C0CPass0.1:90CC0Pass0.1203033Pass0.1215000Pass0.122830CPasso.:14:CC0Pass0.1151033Pass0.1267000Pass0.1279000Pass0.1292000Pass0.1305000Pass0.131000CPass0.1330000Pass0.1343000Pass0.1356000Pass0.1368000Pass0.1381000Pass3.139400:3Pass0Z437C3CPass0.1419000Pass0.14320C0Pass0.14453C3PassC.1458033Pass0.1470000Pass0.1483C00Pass0.1496000Pass0.1509000Pass0.1521000Pass0.1534C0CPass0.1547C00Pass0.1560CC0Pass0.1572000Pass0.1585000Pass0.1598000Pass.WaterQualityaMPFlowandVolumeforFCC1.On—linefacilityvolume:0acre—feetCn—llnefac:litytaroetflow:0cs.Athustedfor15Din:Ccfs.off—i:nefacilitytargetflow:0cfs.Adjustedfor15mm:ocfs.Thisprogramandaccompanyingdocumentationisprovided‘as—is’withoutwarrantyofanykind.Theentireriskregardingtheperformanceandresultsofthisprogramisassumedbytheuser.ClearCreeksolutionsandtheWashingtonStateDepartmentofEcologydisclaimsallwarranties,eitherexpressedorimplied,includingbutnotlimitedtoimpliedwarrantiesofprogramandaccompanyingdocumentation.InnoeventshallClearCreeksolutionsand/ortheWashingtonStateDepartmentofEcologybeliableforanydamageswhatsoeverincludingwithoutlimitationtodamagesforlossofbusinessprofits,lossofbusinessinformation,businessinterruption,andthelike)arisingoutoftheuseof,orinabilitytousethisprogramevenifClearCreeksolutionsortheWashingtonstateDepartnentofEcolocyhasbeenadvisedofthepossibilityofsuchdamaces.Q:\2010\210515\1O_CIV\NON_CAD\CALCS\NofthBusArea\Raingarden3Output.docxRentonECLC2-9OF32-WaterQualityCalculationsFigure4-6 02/10/201216thAvenueRaingardenWesternWashingtonHydrologyModelPRO3ECTREPORTProjectName:16thAvenueRaingardenSiteAddress:CityReportDate:2/10/2012GageSeatacDataStart:1948/10/ClDataEnd::998/09/33PrecipScale:1.00WWHN3ProVersion:PREDEVELOPEDLMTDUSEName:16thAveRaingardenBypass:NoGroundwater:NoPerviousLandUseAcresC,lawn,Flat.117:mperviousLandUseAcresROADSFlAT0.214ElementFlowsTo:SurfaceInterfiowGroundwaterDEVELOPEDBASINName16thAveRainGardenBypass:NoGrondater:PervicusLandUseAcresC,Lawn,Fat.141ImperviousLandUseAcresROADSFLAT0.19ElementFlowsTo:SurfaceInterfiowGroundwater16thAveRainGarden,16thAveRainGarden,RentonECLC2-SoF32.WaterQualityCalculationsFigure4-6 02/10/201216thAvenueRaingardenIRentonECLCWaterQualityCalculations21ooF32.16th_______________________FacilityNamei’Outlet1Outlet2Outlet3DownstreamConnectionIDri%:..0FacilityTypejl%ØTreii&FFReci*abcnAppkdtoFacpOuickTrenchIFacilityBottomElevation(ft)FacilityDimensionsTienchLengthOutletStructureTienchDotLomWidthRiserHeightilt)f.mHEffectiveTot&DepthRiserDiametetfn)(18HBoktomsiopeofTrenthRiserTweInHLefiSideSlopeNokthTypeRightSideSbpeIIIIIIIIIOrificeNumber123MaterialLayersforLayer1Tbcknesfit)Layer1pornsyLayer2Tl*kness(It)Layer2poroLayer3Thickness(It)Layer3paosMylnfiftrationIVESHMeaswedlrrationRate[n/lw)ReductionFactorUseWettedSafacekea(sidewaRs)TotalVoknlrItr&ed(aoe1t)ToalVokzneTIwo&4Risa(aae1t)DiameterHeightQn)-&Ho__HH__Hin.SJin...:JILJ.flVQMux(ds)000TrenchVcineatRiserHead(aae1t).004lolaHShowPondTablejOpenTaUeHIzH__HINOH30fl9aB45TotalVOkMDeT[WOUQIiFac1t4aae4L)PercentIrrated312749205Requiredraingardenarea=210SF<600SFbottomareaprovidedonplans.Layer1thickness=18”soil.Layer2thickness=3”pending+3”freeboard.Percentinfiltrated=92.05>91%waterqualityrequirement.GravelTrenchBedHydraulicTableStaqe(ft)Area(acr)Voluwe(acr—ft)Dschrg(cfsInfilt(cfs)0.0000.0050.0000.0000.0000.0220.0050.0000.0000.0100.0440.0050.0000.0000.0100.0670.0050.0000.0000.0100.0890.0050.0000.0000.0100.1110.0050.0000.0000.0100.1330.0050.0000.0000.0100.1560.0050.0000.0000.0100.1780.0050.0000.0000.0100.2000.0050.0000.0000.010Figure4-6 02/10/201216mAvenueRaingarden0.2223.0350.0003.0000.0130.2440.0350.0003.0000.0100.2670.0350.0010.0000.0100.2890.0050.0010.0000.0100.3110.0050.0010.0000.0100.3330.0050.0010.0000.0100.3560.0050.0010.0000.0100.3780.0050.0010.0000.0100.4000.0050.0010.0000.0100.4220.0050.0010.0000.0100.4440.0050.0010.0300.0100.4670.3050.0010.0300.0100.4890.0050.0010.0000.0100.5113.0050.0010.0000.0100.5330.0053.0010.0000.0100.5560.0050.0010.0000.0100.5780.0050.0010.0000.0100.6000.0050.0010.0000.0100.6220.0050.0010.0000.0100.6440.0050.0010.0000.0100.6670.0050.0010.0000.0100.6890.0050.0010.0000.0100.7110.0050.0010.0000.0100.7333.3050.3010.0000.0100.7553.3050.0310.0000.0103.7780.0050.0020.0000.0100.8300.0050.0020.0030.0100.8220.0350.0020.0000.0100.8440.0050.0020.0000.0100.8670.0050.0020.0000.0100.8890.0050.0020.0000.0100.9110.0050.0020.0000.0100.9330.0050.0020.0000.0100.9560.0050.0020.0000.0100.9780.0050.0020.0000.0101.0000.0050.0020.0000.0101.3220.3050.0020.0030.0101.0410.0050.0320.00000101.0673.0050.0320.0003.020Z0390.0350.0320.0300.020IZ1I0.3350.0020.3000.0101.1330.3053.0020.0300.0101.1560.0050.0020.0000.0101.1780.0050.0020.0000.0101.2000.0050.0020.0000.0101.2220.0050.0020.0000.0101.2440.0050.0020.0000.0101.2670.0050.0020.0000.0101.2890.0050.0020.0000.0100.0050.0033.0000.0101.3330.0050.0030.0000.0101.3560.3050.0030.0030.0101.3780.0050.0030.0030.010Z4003.0050.0030.3000.0101.4220.0050.0030.3300.0101.4440.0050.0030.0000.0101.4670.0050.0030.0000.010RentonECLCZIOF32WaterQualityCalculationsFigure4-6 102/10/201216thAvenueRaingarden11.4890.0050.0030.0000.0101.5110.0050.0030.0000.0101.5330.0050.0030.0000.0101.5560.0050.0030.0000.0101.5780.0050.0030.0000.0101.6000.0050.0030.0000.0101.6220.0050.0040.0000.0101.6440.0050.0040.0000.0101.6670.0050.0040.0000.0101.6690.0050.0040.0000.0101.7110.0050.0040.0000.0101.7330.0050.0040.0000.0101.7560.0050.0040.0060.0101.7780.0050.0040.3680.0101.8030.0050.00401630.0101.8220.0050.0340.2840.010—1.8440.0050.00’S0.4240.0101.8670.0050.0050.5820.0101.8890.0050.3350.7560.3101.91:0.005D.crDS0.9450.0101.3330.0050.3051.1470.3131.3560.3053.0051.3610.0101.3760.3033.0051.5880.0102.0000.0033.0051.8260.010MITIGATEDLANDUSEANALYSISRESULTSFlowFreauencyReturnPeriodsorPredeveloped.FCC41ReturnPeriodE1owcfs2year5wear0.0335410year0.06236925year3.09413230year3.102925:00year0.111764FlowFrequencyReturnPeriodsfcrMitigated.FCC*1ReturnPeriodFlow(cfs)2year0.0385165year0.05511610year0.06453625year0.07479450year0.061386100year0.08721YearlyPeaksforPredevelopedandMitigated.FCCUYearPredevelopedMitigated19500.0620.04919510.097007019520.0620.04919530.0500.03119540.0460.02619550.0560.032RentonECLCZSOF?2-WaterQualityCalculationsFigure4-6 02/10/201216AvenueRaingarden19560.0600.04419570.0570.04219580.0680.05219590.0593.03:19630.0450.03119610.0580.04419620.D500.03219630.0500.01819640.0490.02219650.0580.04319660.0510.02619670.0320.03719650.0770.060:9693.0560.04019700.0470.03319710.0520.03719720.0490.03519730.0750.06019740.0470.03119750.3520.02319750.3700.05419773.0480.035:9780.0570.01819790.0740.05719630.0720.03019810.0650.04919820.0710.05415830.0950.023:9840.0583.04709350.0540.02419860.0490.33519670.0660.05219880.0340.05219890.0390.02219930.0490.01119910Z070.09:09910.0350.08219933.0530.03819340.0350.0:919950.0410.00619960.0530.02919970.0700.05519980.0650.044:9990.0670.329RankedYearly2eaksforPredevelopedandMitigated.EDOêRankPredevelopedMitigated10.10750.091020.09900.082730.09860.082440.03730.369350.38590.060060.08410.053670.07720.057480.07530.055090.07430.0545RentonECLC29oF32-WaterQualityCalculationsFigure4-6 102/10/201216thAvenueRaingarden100.07180.0544110.07140.0519120.07090.0518130.06990.0517140.06820.0489150.06760.0486160.06710.0485170.06620.0474180.06540.0445190.06480.0442200.06250.0441210.06190.0426220.05960.0422230.05930.0405240.05840.0382250.0584260.05700.0372270.05660.0352230.05640.0349290.05373.3345300.05350.0333310.05300.0324320.05240.0323330.05160.0310340.05150.0310350.05110.0309360.05020.0309370.0497.0.0303380.04950.0292390.04940.0292Anfl‘FQ9r410.04900.0256420.04630.0•24.430.04730.0227440.04740.0218450.04630.0216460.04630.0191470.04530.0183480.04103.0183430.03930.0105500.03510.0076IP00#1TheFacilityPASSEDTheFacilityPASSED.Flcw(CFS)PredevDevPercentagePass/Fail0.0294000Pass0.0302000Pass0.0309000Pass0.0317000Pass0.0324000Pass0.0331000Pass0.0339000Pass0.0346000PassRentonECLC.30OFZWaterQualityCalculationsFigure4-6 02/10/201216thAvenueRaingarden0.0354000Pass0.0361000Pass0.0369000Pass0.0376000Pass0.0383000Pass0.0391000Pass0.0398000Pass0.0406000Pass0.0413000Pass0.0421000Pass0.0428000Pass0.0435000Pass0.0443000Pass0.0450000Pass0.0458000Pass0.0465000Pass0.0472000Pass0.0480000Pass0.0487000Pass0.0495000Pass0.0502000Pass0.0510000Pass0.0517000Pass0.0524000Pass0.0532000Pass0.0539000Pass0.0547000Pass0.0554000Pass0.0562000Pass0.0569000Pass0.0576000Pass0.0584000Pass0.0591000Pass0.0599000Pass0.0606000Pass0.0614000Pass0.0621000Pass0.0628000Pass0.0636000Pass0.0643000Pass0.0651000Pass0.0658000Pass0.0666000Pass0.0673000Pass0.0680000Pass0.0688000Pass0.0695000Pass0.0703000Pass0.0710000Pass0.0717000Pass0.0725000Pass0.0732000Pass0.0740000Pass0.0747000Pass0.0755000Pass0.0762000Pass0.0769000PassRentonECLC3IOF32’WaterQualityCalculationsFigure4-6 I02/10/201215tbAvenueRaingarden0.0777000Pass0.0784000Pass0.0792000Pass0.0799000Pass0.0807000Pass0.0814000Pass0.0821000Pass0.0829000Pass0.0836000Pass0.081400DPass0.0851000Pass0.0859000Pass0.0866000Pass0.0873000Pass0.0881000Pass0.2888000Pass0.0896000Pass3.0933000Pass3.09:0000Pass0.09160C0Pass0.0925000Pass0.0333300Pass0.0940000Pass0.0348000Pass0.0935030Pass0.0552000Pass0.0970000Pass0.0977000Pass0.09S5000Pass0.099200CPass0.1003030Pass0.1007000Pass0.1014000Pass0.:022000Pass2.10290C3PassQualoty3>1?FlowandVolumefor?CCI.On—linefac:ltvvolume:0acre—feetOn—linefacolatytargetflow:0cfs.Ad-stedfor15ran:0cfs.Off—linefacilitytargetflow:0cfs.Adjustedfor15nun:3cfsThisprogramandaccompanyingdocumentationisprovided‘as—is’withoutwarrantyofanykind.Theentireriskregardingtheperformanceandresultsofthisprogramisassumedbytheuser.ClearCreeksolutionsandtheWashingtonStateDepartmentofEcologydisclaimsallwarranties,eitherexpressedorimplied,includingbutnotlimitedtoimpliedwarrantiesofprogramandaccompanyingdocumentation.InnoeventshallClearCreekSolutionsand/ortheWashingtonstateDepartmentofEcologybeliableforanydamageswhatsoever(includingwithoutlinitationtodamagesforlossofbusinessprofits,lossofbusinessinformation,businessinterruption,andthelike)arisingoutoftheuseof,orinabilitytousethisprogramevenifClearCreekSolutionsorthewashingtonStateDepartmentofEcologyhasbeenadvisedofthepossibilityofsuchdamages.Q:\2010\210515\l0_CIV\NON_CAD\CALCS\lGthAveRaingarden\SlopedBottom\l6thAveRaingardenOutput.docxRentonECLC32oF3ZWaterQualityCalculationsFigure4-6 02/152012FRONTAGEBYPASSCALCULATIONSDuetotopography,targetsurfacerunofffromthefrontageareaofthesitecannotbecollectedanddetainedonsiteandwillsheetfiowoffofthesiteinanunconcentratedmanner.RefertotheFrontageBypassAreainthefollowingfigures,includedinthissection:Figure1-1:ExistingBasinMap,Figure4-2:DevelopedBasinMap,andFigure4-3:AreaCalculations.KCRTSInputParametersfortheexistingorpredevelopedsiteconditionsareshownintheincludeddatainputsheets.Geotechnicalinvestigationrevealedtillsoilsatthesurface.PertheCityofRenton2009SWDMAmendmentReference11-AFlowControlApplicationMap,thesiteissubjecttotheFlowControlDurationStandard(ForestedConditions).AssumingHistoricalConditions,theentireFrontageBypassAreawasmodeledasforestinthepredevelopedcondition.ThehistoricalconditionpredevelopedmodelfortheFrontageBypassAreayieldsthefollowingpeaks:FlowFrequencyAnalysisTimeSeriesFile:Historicalpre.tsfProjectLocation:Sea-Tac———AnnualPeakFlowRates———FlowFrequencyAnalysiFThwRateRar.kTimeofPeak—-Peaks-—RankReturnProd(CFS)(CFS)Period0.05822/09/0118:000.0741100.000.9900.01671/06/023:000.058225.000.9600.04342/28/033:000.044310.000.9000.00283/24/0420:000.04345.000.8000.02561/05/058:000.03753.000.6670.0443:/:8/3620:000.32562.00C.50’D0.037511/24/364:003.01671.300.2310.07411/09/CS9:033.0028:.:o0.391ComputedPeaks0.06850.000.980Forcomparison,modelingtheFrontageBypassAreawithexistingsiteconditionsyieldsthefollowingpredevelopedpeaks:FlowFrecuencyAnalysisTimeSeriesFile:ExistingPre.tsfProjectLocation:Sea—Tao—--AnnualPeakFlowRates———FlowFrequencyAnalysiFlowRateRankTineofPeak-—Peaks--RankReturnProd(CFS)(CFS)Period0.08242/09/3115:300.1541100.000.9903.05971/05/0216:000.392225.000.9630.09222/27/037:000.088310.000.9000.05588/26/042:000.08245.000.8000.065610/28/0416:000.08153.000.6670.08831/18/0616:000.06562.000.5030.031511/24/063:030.05971.330.2310.15411/09/086:303.05581.100.031ComputedPeaks0.13350.000.980RentonECLCFUFrontageBypassCalculationsFigure4-7 KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:2/10/2012BasinName:FrontageBypassArea:HistoricalConditionPredevelopedFileName:HISTORICALPRERegion:SeatacScaleFactor:laoTimeStep:HourlyRecordLength:ReducedTotalAcreage:fl*:a.,s—PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreageFrontageBypassTillForest39,8990.916TillPastureTillGrassDutwashForestDutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForest0916TillPastureTillGrassOutwashForestOutwashPastureOutwashGrassWetland----EffectiveImpervious----TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesitemustbemodeledasforestinthepredevelopedcondition.IIIIIIIIIlo(O KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/10)2012BasinName:FrontageBypassArea:ExistingConditionPredevelopedFileName:EXISTINGPRERegion:SeatacScaleFactor:100TimeStep:HourlyRecordLength:ReducedTotalAcreage:PeMousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreagePerviousAreasTillForest30,2950.695TillPastureTillGrassOutwashForestOutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas0.2201.000,2200.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForest0.695TillPastureTillGrassOutwashForestOutwashPastureOutwashGrassWetland--—EffectiveImpervious- -—0.220TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:)OpIO I02/15/2012Alsoforcomparison,modelingtheentiresiteasforestinthepredevelopedconditionyieldsthefollowingpeaks:FlowFrequencyAnalysisTimeSeriesFile:TotalSiteHistor±calpre.tsfProjectLocaticn:Sea—Tac---AnnualPeakFlowRates--—FlowFrequencyAnalysiFlowRateRankTimeofPeak——Peaks--RankReturnProb(CFS)(CFS)Period0.48722/09/0118:000.6231100.000.9930.13271/06/023:000.487225.000.9600.36142/28/333:000.374310.000.9000.01383/24/0420:000.36145.000.8000.21461/05/058:000.31553.000.6670.37431/18/0621:000.21462.000.5000.315511/24/064:000.13271.300.2310.62311/39/089:000.31381.103.391ConDutedPeaks0.57750.000.983Alsoforcomparison,modelingtheentiresitewithexistingsiteconditionsyieldsthefollowingpredevelopedpeaks:FlowFrequencyAnalysisTimeSeriesFile:TotalsiteExistingPre.tsfProjectLocation:Sea—Tac—-—AnnualPeakFlowRates--—FlowFrequencyAnalysiFlowRateRankTimeofPeak——Peaks--RankReturnProb(CFS)(CFS)Period0.88352/09/012:001.691100.000.9900.68781/05/0216:001.03225.000.9601.0232/27/037:001.02310.000.9003.70978/25/042:030.95445.033.8003.842613/28/3415:003.88353.000.5673.95441/18/0616:000.84262.000.5001.03213/26/060:000.70971.303.23111/09/036:300.68781.233.091CcnpuoedPeaks1.4750.000.983RentonECLCFrontageBypassCalculationsFigure4-7 KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:2/10/2012BasinName:TotalSite:HistoricalConditionPredevelopedFileName:TDTALSITEHISTDRICALPRERegion:SeatacScaleFactor:100TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoUGroupCoverGroupArea(sf)AcreageTotalSiteAreaTillForest3364147.723TillPastureTillGrassOutwashForestOutwashPastureOutwashGrassWetland—ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:AdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForest7.723TillPastureTillGrassOutwashForestQutwashPastureOutwashGrassWetland----EffectiveImpervious----TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:AssumingHistoricalConditions,thesiteismodeledasforestinthepredevelopedcondition.Sop(0 IIIIIIIIIKCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/10/2012BasinName:TotalSite:ExistingConditionPredevelopedFileName:TOTALSITEEXISTINGPRERegion:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:3_,.,_PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreagePerviousAreasTillForest212,4824.878TillPastureTillGrassOutwashForestOutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas2.8451.002.8450.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForest4.878TillPastureTillGrassOutwashForestOutwashPastureOutwashGrassWetland----EffectiveImpervious----2.845TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:tooplO 021512012KCRTSInputParametersforthedevelopedsiteconditionsareshownintheincludeddatainputsheets.ThedevelopedmodelFrontageBypassAreayieldsthefollowingpeaks:FlowFrequencyAnalysisTimeSeriesFile:Dev.tsfProjectLocation:Sea—Tac-——AnnualPeakFlowRates——-FlowFrequencyAnalysiFlowRateRankTimeofPeak-—Peaks--RankReturnProbCFS)(CFS)?erod0.12642/09/012:000.2701100.000.9900.03171/05/0216:000.155225.000.9600.15522/27/037:000.133310.000.9000.08186/25/342:000.12615.000.8000.105613/28/0416:000.12453.000.6670.13331/18/0616:000.10562.000.5000.124511/24/063:000.09171.300.2310.27011/09/086:000.08481.100.091ComputedPeaks0.23150.000.980RentonECLC7OP(0FrontageBypassCalculationsFigure4-7 FIIIIIIIIIIKCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/10/2012BasinName:FrontageBypassArea:DevelopedFileName:DEVRegion:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:SPeMousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureRemainderofSiteTillGrass272370625OutwashForestOutwashPastureOutwashGrassWetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas02911.000.2910.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrass0.625DutwashForestDutwashPastureDutwashGrassWetland——EffectiveImpervious—--0.291TotalAreaCheck0.916FlowPathDataLandUseLengthSlopeNotes:op(O 0215‘2012FLOWCONTROLPertheCityofRenton2009SWDMAmendmentSectionL2.3.2.E.fiveconditionsmustbemetforprojectrunoff,fromtargetsurfacesthataresubjecttoflowcontrol,tobypasstheonsiteflowcontrolfacilities;justificationforeachconditionfollows:1.Beingthatthestormwaterfromthedevelopedsiteisentirelyinfiltratedonsite,therearenodischargepointsfromtheflowcontrolBMPs.However,thesiteislessthana¼milewide,sothepointofconvergencefortherunoffdischargedfromthebypassedareameetsthe¼milecriterion.2.ComparingtheFrontageBypassAreaexistingsitecondition100-yearpeakflowof0.154CFStotheFrontageBypassAreadeveloped100-yearpeakflowof0.270CFS,thereisa0.116CFSincreasewithdevelopment,whichislessthanthe0.4CFSthreshold.3.WedonotanticipatethattherunofffromtheBypassFrontageAreawillcreateanysignificantadverseimpacttodownstreamdrainagesystems,salmonidhabitat,orproperties.4.WaterqualityrequirementsapplicabletotheFrontageBypassAreawillbemetviaaMitigationTrade,detailedbelow.5.Modelingtheentiresitewithexistingconditionsyieldsa100-yearpeakflowof1.69CFSenteringtheexistingsurroundingstormsystem.ExclusiveoftheFrontageBypassArea,theentiredevelopedsiteisbeinginfiltratedonsitewiththeFullInfiltrationflowcontrolBMPintheformofInfiltrationTrenches;theonlyrunoffleavingthedevelopedsiteisfromtheFrontageBypassArea.ModelingthedevelopedFrontageBypassAreayieldsa100-yearpeakflowof0.270CFS.Sitedevelopmentresultsinanoverallreductiontothesurroundingstormsystem’s100-yearpeakflowby1.42CFS;theneteffectatthepointofconvergencedownstreamislesswiththebypass.Therefore,werequesttherequirementforcompensatorymitigationbyaflowcontrolfacilitybewaivedfortheFrontageBypassArea,RentonECLCOF10FrontageBypassCalculationsFigure4.7 I02/15/2012WATERQUALITYWaterqualitytreatmentfortheFrontageBypassAreaisexcusedviaaMitigationTradeperSection1.2.3.2.0oftheCityofRenton2009SWDMAmendment.Weareproposingtotreatanareaofl6AvenueinexchangeforbypassingtheFrontageArea;seeFigure4-2forthedevelopedconditionsofboththeFrontageAreaandthe16thAvenueArea.RunofffromPGISareassubjecttowaterqualitytreatmentrequirements(fivedriveways=3,829SFP015)isexcusedfromtheonsitetreatmentrequirementbecausetherunofffromtheexistingPOTS(non-targetedPOISarea=runofffromexistingimperviouscollectedbythe16thAvenueraingarden=4,003SF)istreatedontheprojectsiteviaaraingarden.Aportionoftheareadrainingtotheraingardenisbeingre-pavedforthesite’sfrontageimprovements.Weareproposingtotreatagreaterareaof“non-targetedPOTS”thantheareaof“targetedPOTS”thatisbeingreleaseduntreated:waterqualitytreatmentisprovidedinexcessby175SF.I110F1OFrontageBypassCalculationsFigure4-7 5.0CONVEYANCESYSTEMANALYSISANDDESIGNTheconveyancesystemisdesignedtoconformtothe2009KCSWDM.Thepipesystemisdesignedtoconveythe25-yearpeakflow.SeeFigure5-1.TechnicalInformationReportRentonEarlychildhoodLearningCenter5-1000! ISection5.0FiguresIIFigure5-1ConveyanceandBackwaterCalculationsIIIIIIITechnicalInformationReportkentonEarlychildhoodLearningCenter000! 05/10/2012CONVEYANCEANALYSISTheKingCountyRunoffTimeSeries(KCRTS)wasusedtoanalyzetheSouthBuildingHalfdevitimeseriesusing15-minutetimesteps.Aconveyancecalculationhasbeenpreparedtoshowthatonsiteflowscanbecontainedwithintheproposedpipesystem.Theundetained25-yearpeakflowis1.25CFS.A12-inchdiametercircularpipeat0.50percentslopehasafullflowcapacityof2.52CFS,Siteflowscanbeconveyedwithintheproposedpipesystem.FlowFrecuercyAnaysisTimeSeriesFile:l5mindevl.tsfProjectLocaticn:Sea—Tac—--AnnualPeakFlowRates—--FlowFrequencyAnalysiFlowRateRankTimeofPeak--Peaks——RankReturnProb(CFS)(CFS)Period0.65668/27/0116:001.651103.000.9900.45889/17/0217:451.25225.000.9601.25212/08/027:53.691310.CO0.9000.52878/23/C414:300.73445.000.8000.695510/28/0416:000.69553.000.6670.7344:0/27/0510:450.55652.000.5CC0.891310/25/0622:450.52871.300.23:1.6811/09/086:330.45881.100.091ComputedPeaks1.5153.000.980_ _ _UniformFlow-Sot,.ForrrtilfbwCapecly.FnnMeihodIMrDJRo4hnanCceffnt,Flowtdes:079ChannelSlope.0lIltWettedPemmzter314———-ftNom.&D.pTh:_00ftHydrauttftsdeie025DirtIer1-ftTapWth:100-Discharge--->D1neft’IsCrtt,IDepth:-—PercentrutSlope:P.MVelody:usWtyHesd:016Sp.[cEnergy116ftfroudeNunterMannwmDisi.ige:znDsthstVeFoe22ftIsSlopeFut0.OftSOOFIowType:Su,Cnh;el-0C.J,JsSOnSuccessfulRentonECLCICR2-iConveyanceandBackwaterCalcuLationsFigure5-1 IIIIIIIIIIKCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:2/23/2012BasinName:InfiltrationTrench1Dev15-mmFileName:15MINDEV1Region:SeatacScaleFactor:1.00TimeStep:15-mmRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreageTillForestTillPastureTillGrassOutwashForestDutwashPasturePerviousAreasOutwashGrass122440.281Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas1.3781,001.3780.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.281Wetland----EffectiveImpervious--—1.378TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:Grasspavedareasassumedtobe100%impervious.lopfl 05/10/2012KCRTSwasalsousedtoanalyzetheNorthBuildina1-lalifdev2timeseriesusing15-minutetimesteps.Aconveyancecalculationhasbeenpreparedtoshowthatonsiteflowscanbecontainedwithintheproposedpipesystem.Theundetained25-yearpeakflowis1.01CFS.An8-inchdiametercircularpipeat1.00percentslopehasafullflowcapacityof1.22CFS.Siteflowscanbeconveyedwithintheproposedpipesystem.FlowFrequencyAnalysisTimeSeriesFile:l5mindev2.tsfProjectLocation:Sea—Tac———Ann.aPeakFlowRates———FlowFrequencyAna1yssFlowRateRankTimeofPeak--Peaks-—RankReturnProb(CFS)(CPS)Period0.52968/27/0113:001.371100.000.9900.37089/17/0217:451.01225.000.9601.01212/08/0217:150.718310.000.9003.42€73/23/0414:300.59245.030.3000.56:510/28/3416:000.56153.003.667C.5524:0/27/0510:450.52962.000.5300.718310/25/0622:450.42671.300.2311.3711/09/086:300.37081.100.091ComputedPeaks1.2550.000.980UnitonnFbwa’idfl,w-uezsaiS.4ScbeFDridEIowC.pe*Fnoo__1Rougtneascoeffdent0.o1_-Fb,whseo:-it.Channelsk,pe:MIWeftedPttwT,eter2.10NonaIDepi.067ftIiflukada.s0.17-ft067ftToWdUi:ooftDischarge>0thae:ino.sIPerceqtrutwoo———-Fo.owa-VebdyWeVebvtyHead.019ftSpeofc!nerw.oas---ftFrwdeNuatercooM.xnjmDscharg1.32—---—-ftaDisdinerutinWisapeFiiift/ftFbwlypt:--—0CalalalianSoccessrul.RentonECLCOF2-2ConveyanceandBackwaterCalculationsFigure5-1 KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/23/2012BasinName:InfiltrationTrench213ev15-mmFileName:15MINDEV2Region:SeatacScaleFactor:100TimeStep:15-mmRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass32.6560.750Wetland—ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas1.1111.0011110.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureDutwashGrass0.750Wetland——EffectiveImpervious----1.111TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:IIII1IIIIIIHo2-2- 05/10/2012KCRTSwasalsousedtoanalyzetheNorthBusAreadev3timeseriesusing15-minutetimesteps.Aconveyancecalculationhasbeenpreparedtoshowthatonsiteflowscanbecontainedwithintheproposedpipesystem.Theundetained25-yearpeakflowis0.559CFS.An8-inchdiametercircularpipeat0.50percentslopehasafullflowcapacityof0.870CFS.Siteflowsca n beconveyedwithintheproposedpipesystem.FlowFrequencyAnalysisTimeSeriesFile:l5mindev3.tsfProjectLocation:Sea—Tao—--AnnualFlowRate(CFE)0.2940.2050.5590.2370.3120.3290.lCD0.74568/27/0169/17/32212/08/0278/23/04510/28/04410/27/05313/25/0611/09/388:0O17:1514:3016:0010:4522:135:30RentonECLCConveyanceandBackwaterCalculations6oF-2-PeakFlowRates———RankTimeofPeakComputedPeaksFlowFrequencyAnalysi--Peaks--RankReturnProdCOPS)Period0.7451:00.000.9900.559225.000.9600.400310.000.9000.32945.000.8000.31253.000.6670.29462.000.500C.23771.300.2310.2058i.:o0.0910.563E0.OCC.920:_UniformflowIcrdfbw___ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ ___SolveFor[Funbwcp.cty.HFroonMeuiod.IMennkiFonmiaHRm4inenoefIntChanotiSbpehonrelOeparDflterDëdrnmae:Discharge--->013005000610.670.81Wit0.35110-Dl?0.00ftftftma.WadedPrnTwterHydrauicR,dusTapWidth:CflicalDepftrPercentPutSlopeVettsrVetctyHead:SpecifcEnergyFmudeHurterMairgim0charge:OtdlarpePutSnFbwType:0.44-ftlanaO,00fi47-146-009076ft0.00I0.87000560MISubCstic,IJOCaIcuIaon&ceessfut.Figure5-1 KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:1/26/2012BasinName:InfiltrationTrench3Dev15-mmFileName:15MINDEV3Region:SeatacScaleFactor:1.00TimeStep:15-mmRecordLength:ReducedTotalAcreage:tr.avtPerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass95680.220Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas0.6181.000.6180.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.220Wetland----EffectiveImpervious----0.618TotalAreaCheckh44$t838%,%1*tFlowPathDataLandUseLengthSlopeNotes:IIII1IIIIIII(.coF-7- 05/10/2012KCRTSwasalsousedtoanalyzetheMainParkingAreadev4timeseriesusing15-minutetimesteps.Aconveyancecalculationhasbeenpreparedtoshowthatonsiteflowscanbecontainedwithintheproposedpipesystem.Theundetained25-yearpeakflowis0.979CFS.A12-inchdiametercircularpipeat1.00percentslopehasafullflowcapacityof3.56CFS.Siteflowscanbeconveyedwithintheproposedpipesystem.FlowFrequencyAnalysisTimeSeriesFile:l5mindev4.tsfProjectLocation:Sea—Tac---AnnualFlowRate3.5160.3600.9790.4150.5460.5760.7001.30ConoutedPeaks0calajaIlonSocce,,fij.FrequencyAnalysis-—RankReturnProdPeriod1100.000.990225.000.960310.000.90045.000.80053.000.66762.000.50071.300.23181.100.09150,000.920RentonECLCConveyanceandBackwaterCalculations7QPZ’2-PeakFlowRates———RankTimeofPeak66/27/3:89/17/02212/08/0278/23/04510/28/04410/27/053:0/25106_/C90812:0017:4317:1514:3016:0010:4522:15E:30Flow——Peaks(CFS)1.300.9790.7000.5760.5460.5160.4153.3601.19SolvefcrlFuIFCwCapaeflH___....UnflornFGraduaiyVariedFbw_S.uasawel--______ _ ___RoughnnaCaelf&,tChannelpe:I4onMIDepth’DiemelerDbcliarge:FreonMelliod.jaangronuieDischarge--->30_0l---‘ft1.00356FlowAreaWelledPe,*ielv’hydraitRed,,.:TopWdth:Cataloep4lvPettedPutCzfl:VekyVebcayHedSpefcEneryrmudaHunterVaximimDisdiarge:DóchargeFutSlopeFillFlowType’0,793.140250,00ft0.81ft100.00.00032—MINa0.321320.003.B3—ft’ts3.96WIt0.00000SubCxIFigure5-1 KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:1/26/2012BasinName:InfiltrationTrench4Dev15-mmFileName:15MINDEV4Region:SeatacScaleFactor:100TimeStep:15-mmRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(Sf)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass12,8370.295Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertstoImperviousAreas1.0821.001.0820000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOubwashGrass0.295Wetland----EffectiveImpervious----1.082TotalAreaCheck*tft2%*i’J4JFlowPathDataLandUseLengthSlopeNotes:FIII1IIIII 05/10/2012KCRTSwasalsousedtoanalyzetheSouthBusAreadev5timeseriesusing15-minutetimesteps.Aconveyancecalculationhasbeenpreparedtoshowthatonsiteflowscanbecontainedwithintheproposedpipesystem.Theundetained25-yearpeakflowis0.730CFS.A12-inchdiametercircularpipeat1.14percentslopehasafullflowcapacityof3.80CFS.Siteflowscanbeconveyedwithintheproposedpipesystem.FlowFrequencyAnalysisTimeSeriesFile:lsmindev5.tsfProjectLocation:Sea—TacRentonECLCConveyanceandBackwaterCalculations‘10P2-2-PeakFlowRates———RankTimeofPeak———AnnualFlowRate(CFS)0.3850.2680.7300.4070.4300.5220.972Computed66/2770189/17/02212/08/0278/23/04510/26/04410/27/05310/25/0611/09/0816:00:7:4517:1514:3016:0010:4522:456:30FlowFrequencyAnalysi—-Peaks-—RankReturnProb(CFS)Period0.9721100.000.9900.730225.000.9600.522310.000.9000.43045.000.8000.40753.000.6670,38562.000.5000.30971.300.2310.26881.100.0910.69150.000.980PeaksRougftnniCoeffictitChannelSlope:NormalDeoth:CemeterDziare:Discharge--->CMI3001140WItftft3S0ft,IFbwAn.:WelledPerneter:HydtaukcRadija:TOPWdth:CstnlDepUi:PercitPutCflkalStrWiodyHead:SpetfcEnergyEmodeNunter.Ma,nmOádrge:Dstliargerut:SbptPutFlow1.peG.m3.140250.000.8310000011164.840,361.36o.oo4½no0.01130-SutCrtatft.ftftftftft,WeftftIt,”WItFigure5-1 III1IIIIIIIIIKCRTSDataEntry&ComputationSheetProject:21051510-RentonECLCpage1ofCompby:JMKDate:1/26/2012BasinName:InfiltrationTrench5Dev15-mmFileName:15MINDEV5Region:SeatacScaleFactor:1.00TimeStep:15-mmRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreageTillForestTillPastureTillGrassOutwashForestDutwashPasturePerviousAreasDutwashGrass11,6330.267Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas08071000.8070.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassDutwashForestQutwashPastureDutwashGrass0.267Wetland----EffectiveImpervious--—0.807TotalAreaCheck4\FlowPathDataLandUseLengthSlopeNotes:109P2-2- 05/10/2012KCRTSwasalsousedtoanalyzetheOffsitePlaygrounddev6timeseriesusing15-minutetimesteps.Aconveyancecalculationhasbeenpreparedtoshowthatonsiteflowscanbecontainedwithintheproposedpipesystem.Theundetained25-yearpeakflowis0.766CFS.A12-inchdiametercircularpipeat2.09percentslopehasafullflowcapacityof5.15CFS.Siteflowscanbeconveyedwithintheproposedpipesystem.FlowFrecuenovAnalysisIineSeriesFjZe:i5mindev5.tsfProjectLocation:Sea—lao———ArnaPeakFlowPates———FlowFrecuer.cyAnalysiFlowRateRankTimeofPeak--Peaks-—RankReturnProb(CTS)(CFS)Period0.30468/27/0119:0007661100.000.9900.21289/17/0217:450.578225.000.9600.578212/08/0217:150.413310.000.9000.24578/23/0414:300.34045.000.8000.3225:3,28/04:5:000.32253.000.6670.340410/27/03:0:430.30462.000.5300.413310/25/0622:430.24571.300.2310.76611/09/086:300.21281.100.091ConputedPeaks3.70350.003.980rFbwGaauab.VafledaweI43ie.nrnj——____SclYtFor(FuIFIOWCepaclyFrdio’,I1&had:—RowInflSCoefctt:csaEFbwArnamCrrnnft&Spe:00209€YiefttdPtrm,eler:114-—ftNomalDt,:i--ftHydTouitRdlRJS025- -ftOëtrttetioo——ftTopWdft.0.00ftDischarge>Dc$IarQr515ftSjCnnlDtPlli0.92—ftperceiflrul.-¶4Crtc,lSbpe:-10thVelocty-WsVektyHedd:0.61——ftSpeofcEnngy1.67-- -ftFrovOtIhlTttr00*MazEmDc3iargt564- ---DlScter9tFiJ.515——SlopeFur0.02090Flowtype:sbcrrncal[OoaladabonsuccessM- - -RentonECLCIIoP’2-%-ConveyanceandBackwaterCalculationsFigure5-1 IIIIIIIIIIKCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:2/23/2012BasinName:InfiltrationTrench6Dev15-mmFileName:15MINDEV6Region:SeatacScaleFactor:1.00TimeStep:is-mmRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sf)AcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass6.9620.160Wetland--ImperviousLandTypesLandUseAcreageElFELANonEffectiveAreaRevertsto:ImperviousAreas0.6391.000.6390.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.160Wetland——EffectiveImpervious—--0.639TotalAreaCheckFlowPathDataLandUseLengthSlopeNotes:Additionalplaygroundareaassumedtobe80%impervious.I’DnC-y-U—VP_— 05/10/2012BACKWATERANALYSISKCBWmodelingusingtheundetained25-yearpeakflowswasperformedonthepiperunfromtheSouthBuildingHallcourtyardtoInfiltrationTrench1:CB24toCB20.ThecrownoftheproposedpipeatproposedCB20wasassumedtobethetailwaterelevation.SeetheplansandKCBWInputParametersonthefollowingpages.The25-yearpeakconveyanceflow,usingthe15-minutetimestep,fromtheI5mindevltimeseriesis1.25CFS.TheKCBWmodelusingtheundetained25-yearpeakflowyieldsthefollowingresultsfortherun:BACKWATERCOMPUTERPPOGRANFORPIPESPipedatafromfile:southbldghalf.bwpSurchargecoditiotatintermed:atejunctiensTailwaterElevation:375.12feetDischargeRange:1.25to1.25Stepof1.cfsOverflowElevatien:381.8feetWeirNONEUpstreamVelocicv:0.1feet/secPIPENO.1:86LF—12”PIPE80.50%OUTLET:375.12INLET:375.55INTYP:5JUNCNO.1:OVERFLOW-EL:381.45BEND:11DEC0Th/WIDTH:4.0Q-RATIO:0.00Q(CFS)NW(FT)NWELEV.*N—FACDCDNTMDODENWOHWI*1.250.75376.30*0.0130.480.501.001.000.670.750.64Freeboard=5.15feetPIPENO.2:77LF—12”PIPE60.49%OUTLET:375.55INLET:375.93INTYP:5JUNONO.2:OVERFLOW—EL:382.00BEND:69DECOIA/WIDTN:4.0Q—RATIO:0.00•flCFS)MW(FT)MWELEV.*N-FACDCONTWDODENWOMWI1.250.70376.630.0130.490.500.750.750.520.700.64Freeboard=5.37feetPIPENO.3:26IF—9’PIPE66.38%OUTlET:376.26INLET:376.04:NTYP:5JUNONO.3:OVERFLOW—EL:381.78BEND;0DESIA/W:CTH:2.0Q—RAT:0:0.00(CFS)NWNWELEV.•N-FAODONTMDODEMWOEWI1.250.74378.78*0.0130.530.300.370.370.53““0.74Freeboard=3.00feetPIPENO.4:34LE—8’PIPE80.79%OUTLET:378.04INLET:378.31INTYP:5JUNONO.4:OVERFLOW-EL:381.50BEND:0DECDIA/WIDTM:2.0Q-RATIO:0.00L(CFSMW(PT)JiMELEV.N-FACDODNTMDODEI-IWOHWI*1.250.94379.25*0.0130.530.670.740.740.630.940.76Freeboard=2.25feetPIPENO.3:25IF—8’PIPE80.49%OUTLET:376.31INLET:376.49INTYP:5JUNONO.5:OVERFLOW-EL.381.50BEND;BDECDIA/W:DTH:2.0Q—RATIO:0.00Q(OFS)EW(FT)NWELEV.N-FAODOONTMDODEMMDHWI1.251.25379.73*0.0130.530.670.940.941.141.250.78Freeboard=1.77feetRentonECLC0F2—2—ConveyanceandBackwaterCalculationsFigure5-1 PIPENO.6:31LF—B”PIPE80.48%OUTLET:JUNCNO.6:OVERFLOW—EL:381.50BEND:52DEGQ(CFS)HW(FT)NWELEV.N-FACDODN*******1.251.63380.260.0130.530.67Freeboard=1.24feet378.48INLET:379.63INTYP:5DIA/WIDTN:2.0Q-RATIO:0.00TWDODENWOHWI*******1.251.251.431.630.85PIPENO.7:34LF—8”PIFE90.50%OUTLET:378.63INLET:378.80INTYP:5Q(CFS)NW(FT)NWELEV.N—FACDCDNTWDODEHWOHWI***********1.252.12380,920.0130.530.671.631.631.822.120.96Freeboard=0.88feetRentonECLCConveyanceandBackwaterCalculationsi4OF-2IIIII05/10/2012IIIIIThebackwateranalysisshowsthatatleast0.5footoffreeboardismaintainedforthe25-yearevent.Siteflowscanbecontainedwithintheproposedcatchbasinandpipesystem.Figure5-1 05/10/2012KCBWmodelingusingtheundetained25-yearpeakflowswasperformedonthepiperunfromtheNorthBuildingHalfcourtyardtoInfiltrationTrench2:CR41toCR46.ThecrownoftheproposedpipeatproposedCS46wasassumedtobethetailwaterelevation.SeetheplansandKCBWInputParametersonthefollowingpages.The25-yearpeakconveyanceflow,usingthe15-minutetimestep,fromtheI5mindev2timeseriesis1.01CFS.TheKCSWmodelusingtheundetained25-yearpeakflowyieldsthefollowingresultsfortherun:BACKWATERCOMPUTERPROC-RANFORPIPESPipedatafromfie-.nortbbldghalf.bwpSurchargeconditionatintermediatejunctionsTailwaterElevation:376.49feetDischargeRange:1.0lto1.01Stepof1.[cfs]OverflowEevatior.:381.8feetWeir:NONEL1pstrear.Veloci:y:0.1feet/secPIPENO.1:29LI-12”PIPEC0.48%OUTLET:375.49INLET:375.63INTYP:5JUNONO.1:OVERFLOW-EL:381.60BEND:0DECDIA/WIDTN:4.0Q-RATIO:0.00OCCEs)MwFTMWELSU.N—lAoDDNTNDODEHWOsW:1.010.90376.530.0130.430.451.001.000.980.930.57Freeboard=5.07feetPIPENO.2:84IF—12”PIPEC0.50%OUTLET:375.63INLET:376.05INTYP:5JUNONO.2:oVERFLOW—EL:381.45BEND:12DEShA/WIDTH:4.0:—RAT:C:0.000(015)HW(FT)MWELEV.*N—FACDCONTMDODEENDRN:1.010.65376.70*0.0130.430.450.900.900.560.650.57Freeboard=4.75feetPIPENO.3:96LI—12”PIPE80.53%OUTLET;375.05INLET:376.45INTYP:5JUNONO.3:OVERFLOW—EL:382.00BEND:90DESDIA/M:DTH:4.0Q—RATIC:0.00HCF5)HW(FT)MWELEV.N—lAODONTNDODIHWOEWI**************1.010.69377.17*0.0130.430.450.650.650.450.690.64Freeboard=4.83feetPIPENO.4:27LI—9”PPE91.70%OUTLET:376.81INLET:377.27:NTYP:5JUNONO.4:OVERFLOW-EL:381.77BEND:14DECDIA/WIDTH:2.00-RATIO:0.00JCFS)HW(FT)MWELEV.*N—FACDCONTWDODEI-iWOMWI***1.010.65377.920.0130.460.390.3€0.390.490.65Freeboard=3.85feetPIPEND.5:68LI—B”PIPEC1.00%OUTLET;377.27INLET:377.95INTYP:5JUNCNO.5:OVERFLOW-EL:381.50BEND:4DECDIA/WIOTH:2.0Q-RATIO:0.00Q(CFS)MW(FT)NWELEV.*N—FACDCONTWDODEI-IWOFUll*1.010.65378.60*0.0130.480.470.650.650.60.65Freeboard=2.90feetRentonECLC150P2-2-ConveyanceandBackwaterCalculationsFigure5-1 05/10/2012I6:31LF—SPIPE81.00%OUTLET:6:OVERFLOW—EL:381.64BEND;35DEGHWFTFWELEV.*N-FACDC0.71378.970.0130.490.477:32LF—9”PIFE81.00%OUTLET:378.26HW(FT)HWELEV.*N-FACDCDNTW*0.81379.39*0.0130.480.470.71378.26INTYP:52.0Q—RATIO;0.00DEMWONW!0.500.713.68INLET;378.58INTYP:5DODENWOHWI**0.710.580.810.78Thebackwateranalysisshowsthatatleast0.5footoffreeboardismaintainedforthe25-yearevent.Siteflowscanbecontainedwithintheproposedcatchbasinandpipesystem.IRentonECLCConveyanceandBackwaterCalculations1CcPP2-2IIIIIPIPENO.3UIICNO.Q(CFS1.01FreeboardPIPENO.Q(CFS)*1.01=2.67feet377.95DIA/WTW0.65INLETIDTH:DOC.65Freeboard=2.41feetIIIFigure5-1 05/10/2012KCBWmodelingusingtheundetained25-yearpeakflowswasperformedonthepiperunfromwestoftheNorthBuildinciHalftoInfiltrationTrench2:CShAtoCS1SS.ThecrownoftheproposedpipeatproposedCS155wasassumedtobethetailwaterelevation.SeetheplansandKCSWInputParametersonthefollowingpages.The25-yearpeakconveyanceflow,usingthe15-minutetimestep,fromthelsmindev2timeseriesis1.01CFS.TheKCBWmodelusingtheundetained25-yearpeakflowyieldsthefollowingresultsfortherun:BACKWATERCOMPUTER?ROSPflFORPIPESPicedatafromfile:westhldgportion.bwpSurchargeconditionatinten.ediatejuncticnsTaalwaterElevatior.:376.12feetDischargeRarsge:1.01to1.01Stepof1.[cfs]OverflowElevation:381.35feetWeirNONEUpstreamVelocity:0.1feet/secFreeboard=4.30feetPIPENO.JUNGNO.Q(CFS)1.01Freeboard=2.69feetINLET:376.53:NTY?:510TH:2.0Q-PAT:o:0.00oo:6:r.’Th1.000.43”’”0.57INLET:376.97INn?:5WIDTH:2.0Q—RATIO:0.00DO0!HWOHWI0.570.430.57376.97INLET:377DIA/WIDTM:2.0TWDO060.570.570.43.44INTYP:5cj-RATIO:0.00i-IWOHWI0.57PIPENO.4:65LF—12’PIPE@1.00%OUTLET:JUNONO.4:OVERFLOW-EL:381.30BEND:35DEGQ(CFS)MW(FT)MWELEV.*N-FACDCDN****4***4*41.010.57378.66*0.0130.430.37Freeboard=2.64feet377.44INLET:378.09INTYP:5DIA/WIDTH:2.0-RATIO:0.00TWDODESWOHWI0.570.570.430.57PIPENO.5:26IF—12PIPE31.00%CUTlET:376.09INLET:378.35INTYP:S(CFS)HW(E’THWELEV.N-FACDCUN7WDODEHWOEWI****44*******4***4***-********1.010.59378.94*0.0130.430.370.570.570.430.59Freeboard=2.41feetThebackwateranalysisshowsthatatleast0.5footoffreeboardismaintainedforthe25-yearevent.Siteflowscanbecontainedwithintheproposedcatchbasinandpipesystem.RentonECLCConveyanceandBackwaterCalculations17oFflPIPENO-.-JUNONO.-(CFS)1.011:112LF—12”PIPE91.26%OUTLET:375.121:OVERFLOW-EL:381.40BEND:7DESDIA/Wp”(fl)MW61EV.‘l—FACDCONTW0.57377.10*0.0130.430.351.00376.53DIP.’TN0.57PIPENO.2:44LF—12”PIPE31.00%OUTLET:JUNGNO.2:OVERFLOW-EL:381.35BEND:9DEC-.(CFS)HW(FT)NWELEV.N—FACDCIN1.010.5377.540.0130.430.37Freeboard=3.81feet3:47LF—12”PIPE31.00%OUTLET:3:OVERFLOW-EL:381.35BEND:2DECHW(FT)MWELEV.*N-FAGDCDN0.57378.010.013C.430.37FigureS-1 210515FIGURE5-1JMK5/10/2012KCBWINPUTPARAMETERS=INPUTTHISINFORMATIONINTOKCBWINLETPIPEPIPEINLETRIMBENDINLETOUTLETINLETPIPELENGTHDIAMETERPIPEOUTLETINVERTINLETINVERTINLETELEVATIONANGLESTRUCTUREQCSCB#(FT)(IN)TYPEELEVATION(FT)ELEVATION(FT)TYPE(FT)(O)DIAMETER(FT)RATIOSOUTHBUILDINGHALF;n=0.013LCPE/CPEPTAILWATEROUTFLOWELEVATION=376.12FT2023186128375.12375.555381.4511402331277128375.55375.935382.00694031293288B376.26378.045381.78020292743488378,04378.315381.50020272653586378.31378.485381.50820262563188378.48378.635381.505220252473488378.63378.805381.80-20Ql5mindevl25=1.25CFSNORTHBUILDINGHALF(EAST);n=0.013LCP&CPEPTAILWATEROUTFLOWELEVATION=376A9FT4645129128375.49375.635381.600404543284128375.63376.055381.4512404334386128376.05376,485382.009940343642788376.81377.275381.771420363956888377.27377.955381.50420394063188377.95378.265381.643520404173288378.26378.585381.80-20Q15m1ndev225=1.01CFSNORTHBUILDINGHALF(WEST);n=0.013LCPE/CPEPTAILWATEROUTFLOWELEVATION=376.12FT158141112128375.12376.535381.407201410244128376.53376.975381.35920109347128376.97377.445381.3522098465128377.44378.095381.303520ShA526128378.09378.355381.35-20Ql5mindev225=1.01CFS-pN—————aaaaaaa—S—— 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C),0a0-LU-u-iUCDzzCuJ-J00rC-JC>--JCLUCATCHBASINSCHEDULE!PIPESCHEDULEIC8gI1W[IPis.BI35OOESs1F:0!AASN453442,CASTONTWIGAICCOVERNnmjEsiaE4vs—u’l:Sr.!;cPAFNic‘cAU7702042FE17CZVTU7STORMDRAINAGENOTESo250XC%0CCfl>FORSTD?iI0RRNACLMAOIJI.P40SEIOJNDAIODv04*09A4OJ*00PERIMETEROF031(095,COAHECITOCArD!0354II,IN,46,flAOSI..3RAIN0Nc94Th040%PEORMN.INPILWATO419001fl54b4.5W420U.NOTVt.oo,anrmojvrapvcat.o:SINSE.NOTUt.RPRAPWITALLNOTUtGRAINCNO094ThV4A0AWvREO0GENERALNOTESCNImZCrjRc‘305r3rER2ItO)fl1S2*E.4cjhO3WA...*0:25R5120[15L12AS1N3tSitsSE1502CaOCASr‘ao51rUhPPEOTAS-flC9ThEThERIC02C:TTDJRTAa..1ER20s.A.a¼CrPEATDNh)EJIIEC5540T02CTt3CPE’.D0AThjtE{RAL75C2204CFE042FT‘ENONC,2Srni,,*OGOWNS’S0(7*015.5.4591400744ThNLTI5PART*01704901530NO.I.CIII4Nt5L’-20-rPE‘-,‘47SF-fl250‘—/S—774%o6’050%32J-flftEcS150%CNCC:a©APORTIONOFSEC.4,TWP.23N.,RGE.E.,Wit,KINGCOUNTYWASHINGTONJr3*0OWE!—05-340500—___________/—\t.‘——0‘VN.‘:3’SNO(Vb*035.2‘0—N,N0447743013015011’_,/:6_e/*-FORC\\-,ri’‘___________‘—,—LUWRNC5014CR(500(0)\-S7—C*fl24ME3AR4/zN\\7V0.31400(I2’SW)0050-I/TWOE304000‘</(730710514/\—\/1NOTES,—-.PIPEMATERIALASSPECI7ER‘-“N-,—c)c‘3)vcp,CIASC6/IO_D!CREIT)TW(/r._ztf43f4///-\\‘L-314I-.,,—‘______<N/N.“.‘N//V’”,.Q.‘/“—.-4’¶t5-4\/S‘N.çN.N.CLEAN-OUTDETAILIr\_--cV04Cr...“NttIL__________________________IJATflUhUE-°Ed’444mnInLIn0Yb—____________________________________aCIT”O_______PDATE_____________IPonnngJ0uIdlflg/PubhCW0PkDept______NO.RE7AISIONEARLYCHILDHOODLEARNINGCENTERRENTONSCHOOLDISTRICTSTORMDRAINAGEPLAN-NWAREA24—15—102C1.42205D2-00F2-%I±INININ,NI4 UC=aLUIzuJCCDzzLU-JC00-IC-J4—>--J‘CLU,1.1’1’“I/1’;//1’/FF=382.04APORTIONOFSEC.4,TWP.23N.,RGE.E,W.M.KINGCOUNTYWASHINGTONMATCHLINE-SEEC1.41r-rTrrqrr77rr7r-‘—,‘I—__/T\H,-.IJJJLIII”.—Jfl///,__—‘--—-jOJ-7=r—--——-——HH’-1‘Ii—ir--’—=-P7’1Mi’I/?(\‘tt—”VIt.,IN(SIIS\‘‘II“-.I-{,385--‘4I——7II——‘128,,/I‘.•,..‘/CCIII—.—.——.‘‘‘-—.——34INlfl00601100114;..JI[3703425I/,1/--I///j/P—I,1i?___-C..T1,————Fl/////I.,CATCHBASINSCHEDULES1m.‘(4“91—Ia38140027653:irNS&’7.1307338042,5o.flOE24/SW)LIN0U)08.37550IF.374.50(13’NI)10375.00(II’N)N15801593307390.67jIS.1191348’tW/SW)ID00INC3608.36145IF.375.12(ItNW)6.37513(ItI)10’376.45(12SW)N188115441307349.72CPF.1191I98.38150II.378.50(664.00.5)N168122.361307354.50(sf170.Th7’[I0038150I[37915(8NIN6800404£1387412.494f179.11W1WIt7Sat1001N;[C8.330:03Tht2116.0)(.2780041C.37828(6’5)N14011050138780934EBpB.fl1IRIO38172F.37870(64*41,5)N14013464I138741)43COp9,I418.38170[.3767)(84*60,5)N16811625I38747429COPS,fl!348.1/5000LR2N0L8618.381.50It-37M2(it41.4,5)N16810433F1387404.11161211.1190348’NW/SCUDLOCRI4O1861037975C.375.75(ItNC’376.75(ItN)418802681F337495.55/(sr,i6,flOi2lOSs/flO.055,0SRsI380756’37575(:tF)6623414F130742633(sf21.11)12SIN.39015II.37564(8’N168156.30130751582p3.rooF48’sRiol—21.451E375.58(8•1)Il’37555(IlN.0411661506711337507.29(sf24.1190I08’.381.606—37880(8NWO44LSS,11)N168360.65,387263.30(sf35.WEI98.MI50it.37863(5’40.04,1)N193888.02I13873501991II11911—SW.391110378’!)t037885(C04;1683812[120741950tsr’.1191I618.36150Il’3783)(N’8158278.11[131145430(sf281101’61038170II.37&2i(081,56.50)58257.771317478.68cam.TonI610381750’37804(C8*0.54.50)8168275.31[130748815(sf387790I610381,720.37823)68*62,5)N158293.2211307481.87(sit’“W2‘S’s00.8=38250C—370%iS’k’tC-375S3i’,tcS’:N1638,515[1387514.20(sf32.119110,8.38545II—378.04or6,3)N5838785307531.49801U88260S-:2’042501I,—6’5.:5017701-’1’0405013511—5’5’63553011-8’5-I50%lILY—5’5.I001JILT-8,5=5.76135(1-05.25003311—CPIES.20013101-Cs=0,5013411—8.0.058%6501-‘3,52381SILI—13’5’‘.781PIPESCHEDULES‘C,00©@1SS©S501s-itt’41501s-at3015-01ClII’U,It5394%10311—2’041.20%811—85=126%NDU’—13’91PFE04050%47II—6’0.’.CL505—22811511—CS4,1387611—11’91WOFt5’0,00%13Li—I’04I00%7601—12’S—20095211—11’91007*0040.501S0©1010SS1010CITYOFRENTONPionning/OuOdinQ/PubIiCWork,D,pt.84,00)48’#WI6,0)0w‘IiU)Uia-j=0I.c06*100090*1201020401017For,STORMDRAINAGENOTES004140000100441C904,SEE8800600*0011044-30100i*04640110108804146041113040*90000*18*00091084(11600WJ,2.NL000.Ii‘31*7006*04II‘845,.435:6=1,01101½446Th680y24aC’.amoo,Wk045.!41,I.ithtD.®NC0US,134400Q211049i6If;52184&YC1500®sPEAoaartLQ.flt79oIfliI00404p.‘3.’.,4T*.23t.18000.40115.68151111*401410050013,SIC1/0’I000I%’26IICUOf;IAY(s55,36)W1,ThC0417140046&LI.,S’JxiCt’.GENERALNOTES000,nIO0.TRCp000r30.38224’?,,03,,r&40.IA,.%C16’,,.440C11(sSTEIN1,Sk,S’s-N049101,11.tC1264304717ayop4o,u(P910007t,,3,€_’5€CThK‘CC&’,I’SPICNNIII.DOSS,6060k41”014100083G€I73(0.15542713Cr,410#0050!071404S*061)J,XUA,7910112021LA90S1*,’ItANS138111242,82*S’RP,3340SE001*111,S.?‘k.SOnjWEmn.,,!,2‘S&1“——-c‘c’‘‘ca,.n.w.fl1”‘tI.-44’.S!‘.‘t?1rnmthaTACOMA-SEATTLE3815NflSetSdo304,Inn,,WA984041satnl2&d,Annu.,5,620,OasiSe,50*198101-,——298.3672428100EARLYCHILDHOODLEARND’JGCENTERRENTONSCHOOLDISTRICTSTORMDRAINAGEPLAN-SEAREA34102012Ct4329504N2J0F2-2-141—INININT4I4 UawF—2LUC02zLU-J000-I-9C>;LUC)’VI0:WIWI1I01I-I<I/FF=382.04//04APR108041!002040rETI,MATCHLINE-SEEC1.42_‘J11ICr7691600 2“k,-638446CTTOBUSSuITE2•7138DW4EOJTSw/C160STI7Th?‘-‘./42ANDSTUBS.I‘\\3_7I.3—‘-_\\,/I______j_I\j//1/.*___/4______382/“--____________________________S ---S-STORMDRAINAGENOTES1Lo,8a,4Nrc1nAIA004100908102084.35168)4688419*066100468TI—\CATCHBASINSCHEDULE.@3D84€8616898*11200046AR20IPOPERIUETE68/T\3L2046C0€It‘Tt-1038)1.51.@3sCR4r.110IZ@3‘C:@3))4P1!GTJ€8‘CUfl‘04SD1L0.01Ut.@3PWV4.LN/f4sfl25OM’38637SBSW6*)1.37043)1•N.5%806262€207526.910I46.fl?C2W/SQJD10LNCUIR9382.25ID.37548(ItSW)N16584135£120752103N8,5.6I--S.PIPESCHEDULE.IEi68134..284.382686.278BrrNw)6_27688itN8244422£130763710apS.738428/5030608IM381.7016.37744I8NCSW,)N6843263O30749644I36.fll’€IRu-38177ID.377.271WN84450.73£30750263E137.flItI44341761637739N18246343O307488.67(I3&flIt84.30176lB.374188•N)JO.374.16W5)I6376.33(!W)N168431031307435.076.41514.6)HILLCRESTLANENE5—020120•4w,satJX-(.%ICPu.342.36.37662(8.ES)3m0Jr00N1686516141307320.66$50.1384I8/SOlD10068112991€.311.76JO.37676(6•NL5468)N10861115130738312EjJI5l.fivE014.361.7510379.48(6•6N80624.94307375.53GENERALNOTES1Wogo—Ri.38:50037712(!V237435336844073841P14.201.6,037426(6’N18445468[1307415.09Ei4’.fiRSIP19.381604.374541W6*6058.68)N1684379468447,1384I0130737785988.3818716376.61(8N)68p41fivEI6-376.78)0SN(014.38158N18061788037658I!64.64.58.68)4130745122N16847366(130736091C3j4flIt14840/SOJO10681406068443lOPE248..984.38155P4.36145IT-37562)85)6:316.05(I24,5)ID’375,4892’0.0)N12022803N186047.1413076335761307453.70€01VOl--0’SEA0*fl41k?.ANS520O%2IT8.620103.Sfi8S•ROLNOS893..4363OlElST2.1316-6YZ5.630’38if.8’S2.83557iF—ItPEE989€5-0801CO‘4®@3@1@oS@@®@3®©@34681104624227!-in‘4).f•5_Tn12!-5-5.168160!-89.I68221If-89J02227OfCP42S.274931iF-85.I32Of-8.5-168132Of-8.5-I68264!-itS-066884[7—II5-06032966-rs.oso,4.0.,5T11114341Sja20CCOEttATCO0jtrnibE8*620*5k,OC0)42320941843Cl.’flL€rAEA’U8120030us.&42C4668104006’O&5JCE0(0’€0CSE0904688*0011:00*.7Sc:COSE*40SD*D0.ANStoaIn.509*.*0Ofl[0STETC4411—8’5-24536011-8.5.1,0014011.8.5.1680CILI-I’DI.0.5060502S35n,*L’çOo..,—5—4*_t*’retarTACOMASEATTLE2195Nat3S684&ä30ti.wA8840022fl24291201200Avsnu•,SoOe1820,Sae1e,WA00IOI—-—————268W,1425TE-.-CTYOFRENTONPJ:nnilg/Building/PUbI1C80,81DspIEARLYCHILDHOODLEARNINGCENTERRENTONSCHOOLDISTRICTSTORMDRAINAGEPLAN-NEAREA44—16—la1IAIHNIN 6.0SPECIALREPORTSANDSTUDIESAgeotechnicalanalysisofthesitewascompletedbyAssociatedEarthSciences,Inc.Theirreportandsupplementmemosareincludedintheappendix.TechnicalInformationReportRentonEarlychildhoodLearningcenter6-IDODS ——————————————— Section6.0FiguresFigure6-1SubsurfaceExploration,PreliminaryGeotechnicalEngineeringandInfiltrationReport.AssociatedEarthSciences,Inc.,November18,2010Figure6-2PreliminaryDesignInfiltrationRateTechnicalMemorandumAssociatedEarthSciences,Inc.,August15,2011Figure6-3SummaryofAdditionalBoringstoDelineateExistingFillAssociatedEarthSciences,Inc.,August17,2011TechnicalInlormabonReportRentonEarlychildhoodLearningcenter —————————aa———aa—a ‘-IAssociatedEarthSciences,Inc.‘L1IJb1[Ce/&r1thOver.zYiof&rtlceNovember18,2010ProjectNo.KE100287ARentonSchoolDistrictdoGreeneGasawayArchitects,PLLCP.O.Box4158FederalWay,Washington98063Attention:Mr.CalvinGasawaySubject:SubsurfaceExploration,PreliminaryGeotechnicalEngineering,andInfiltrationFeasibility’ReportProposedEarlyChildhoodCenter1800IndexAvenueNERenton,WashingtonDearMr.Gasaway:Wearepleasedtopresentthesecopiesofourpreliminarygeotechnicalandinfiltrationfeasibilityreportforthereferencedproject.Thisreportsummarizestheresultsofoursubsurfaceexploration,geologichazards,andgeotechnicalengineeringstudies,andofferspreliminaryrecommendationsforthedesignanddevelopmentoftheproposedproject.Adiscussionofthefeasibilityofinfiltratingstormwaterisalsopresented.Atthetimethisreportwasprepared,thesitewasintheconcepmalplanningstageandnoprojectlayoutorplanshadbeenformulated.Werecommendthatwebeallowedtoreviewtherecommendationscontainedinthisreportandmodifythem,ifnecessary,whenaprojecTplanhasbeendeveloped.Wehaveenjoyedworkingwithyouonthisstudyandareconfidentthattherecommendationspresentedinthisreportwillaidinthesuccessflulcompletionofyourprqject.Ifyoushouldhaveanyquestionsorifwecanbeofadditionalhelptoyou,pleasedonothesitatetocall.Sincerely,ASSOCIATEDEARTHSCIENCES,INC.Kirkland,WashingtonKrEftMerriman,RE.PrincipalEngineerKDM/Lb—KE2S7A2-ProjecLs\2OIOOZ87KE\W?Kirkland•EverettTacoma425-827-7701425-259-0522253-722-2992 WaterResourcesAssociatedEarthSciences,IflCQa’ny‘jJnvZwSubsurfaceExploration,PreliminaryGeotechnicalEngineering,andInfiltrationFeasibilityReportRenton,WashingtonPreparedforRentonSchoolDistrictdoGreeneGasawayArchitects,PLLCProjectNo.KE100287ANovember18,2010SustainableDevelopmentServicesGeotechnicalEngineeringIIIIIIIIIIPROPOSEDEARLYCHILDHOODCENTEREnvironmentalAssessmentsandRemedIadonGeologicAssessments SUBSURFACEEXPLORATION,PRELIMINARYGEOTECHMCALENGINEERING,ANIINFILTRATIONFEASIBILITYREPORTPROPOSEDEARLYCHILDHOODCENTERRenton,WashingtonPreparedfor:RentonSchoolDistrictdoGreeneGasawayArchitects,PLLCPU.Box4158FederalWay,Washington98063Preparedby:AssociatedEarthSciences,Inc.9115Avenue,Suite100Kirkland,Washington98033425-827-7701Fax:425-827-5424November18,2010ProjectNo.KE100287A ISubsuiface&ploimion,PreliminatyGeozechnicalProposedEarlyChildhoodCenterEngineering,andhzfiuivrio;zFeasibilityReportReman,WashingtonProjectandSheconditionsI.PROJECTANDSITECONDITIONSI1.0INTRODUCTIONThisreportpresentstheresultsofoursubsurfaceexploration,geologichazards,preliminarygeotechnicalengineering,andstormwaterinfiltrationfeasibilitystudiesfortheproposedEarlyChildhoodCenter.Thesitelocationisshownonthe“VicinityMap,”Figure1.Theapproximatelocationsofexplorationboringscompletedforthisstudyareshownonthe“SiteandExplorationPlan,”Figure2.LogsofthesubsurfaceexplorationsandcopiesoflaboratorytestresultscompletedforthisstudyareincludedintheAppendix.1.1PurposeandScopeThepurposeofthisstudywastoprovidegeotechnicalengineeringdesignrecommendationstobeutilizedinthepreliminarydesignoftheproject,andtoprovideinfiltrationfeasibilityrecommendationstoguideconceptanddesigndevelopmentphasesoftheproject.Thisstudyincludedareviewofselectedavailablegeologicliterature,advancingsevenhollow-stemaugersoilborings,installingonegroundwaterobservationwell,andperforminggeologicswdiestoassessthetype,thickness,distribution,andphysicalpropertiesofthesubsurfacesedimentsandshallowgroundwater.Geotechnicalengineeringstudieswerecompletedtoestablishrecommendationsforthetypeofsuitablefoundationsandfloors,allowablefoundationsoilbearingpressure,anticipatedfoundationandfloorsettlement,pavementrecommendations,anddrainageconsiderations.Wealsocompletedalimitedstudyregardingthefeasibilityofinfiltratingstormwatergeneratedbythenewproject.Thisreportsummarizesourfieldworkandofferspreliminarygeotechnicalengineeringandinfiltrationfeasibilityrecommendationsbasedonourpresentunderstandingoftheproject.Werecommendthatwebeallowedtoreviewtherecommendationspresentedinthisreportandrevisethem,ifneeded,whenaprojectdesignhasbeendeveloped.1.2AuthorizationAuthorizationtoproceedwiththisstudywasgrantedbyMr.CalvinGasawayofGreeneGasawayArchitects,PLLC.Ourworkwascompletedingeneralaccordancewithourscopeofworkandcostproposal,datedSeptember10,2010.ThisreporthasbeenpreparedfortheexclusiveuseofGreeneGasawayArchitects,PLLC,theRentonSchoolDistrict(District),andtheiragentsforspecificapplicationtothisproject.Withinthelimitationsofscope,schedule,andbudget,ourserviceshavebeenperformedinaccordancewithgenerallyacceptedgeotechnicalengineering,engineeringgeology,andhydrogeologypracticesineffectinthisareaatthetimeourreportwasprepared.Nootherwarranty,expressorimplied,ismade.NovemberiS,2010ASSOCIATEDEARTHSCIENCES,INC.-K510026712.Pr0jeu120100237.KSWPPage1 SubsurfaceExploration,PreliminaryGeotechnicalProposedEarlyChildhoodcenterEngineering,andInfiltrationFeasibilityReportRenton,WashingtonProjectandSiteConditions2.0PROJECTANDSITEDESCRIPTIONTheprojectsiteisthatoftheexistingEarlyChildhoodCenter,whichishousedinabuildingpreviouslyusedasanelementaryschoolandmiddleschool.WeunderstandthattheproposedprojectwillincludedemolitionofalloftheexistingbuildingsandconstructionofanewEarlyChildhoodCenterfacility.Noprojectconcepthadbeenpreparedwhenthisreportwaswritten.Stormwatermanagementplanshasalsonotbeenformulated.Weanticipatethatthenewfacilitywillincludelowrisebuildingswithfoundationloadstypicaloflocalschoolconstruction.Weanticipatethatthenewbuildingswillbeconstructedclosetoexistinggradeswithouttheneedforsubstantialearthworkcutsorfills.Theexistingfacilityincludespermanentandportablebuildingsalongthewestsideofthesite,existingpavedparkingareaswestandnortheastofthemainbuildings,andpavedandunpavedplayareaseastoftheexistingschool.Anaturalturfsoccerfieldislocatednorthandeastoftheexistingbuildings.Thesiteisrelativelyflat,withoverallverticalreliefvisuallyestimatedatlessthan10feet.Thesitedoesnotappeartocontainareasthatwilltriggergeotechnicalcriticalareasregulationsrelatedtosteepslopesorseismichazards.3.0SUBSURFACEEXPLORATIONOursubsurfaceexplorationcompletedforthisprojectincludedadvancingsevenhollow-stemaugersoilboringsandinstallingonegroundwaterobservationwell.Theconclusionsandrecommendationspresentedinthisreportarebasedontheexplorationscompletedforthisstudy.Thelocationsanddepthsoftheexplorationswerecompletedwithinsiteandbudgetconstraints.3.1ExplorationBoringsTheexplorationboringswerecompletedbyadvancinghollow-stemaugertoolswithatrack-mounteddrillrig.Duringthedrillingprocess,sampleswereobtainedatgenerally2.5-to5-foot-depthintervals.Theexplorationboringswerecontinuouslyobservedandloggedbyarepresentativefromourfirm.TheexplorationlogspresentedintheAppendixarebasedonthefieldlogs,drillingaction,andinspectionofthesamplessecured.DisturbedbutrepresentativesampleswereobtainedbyusingtheStandardPenetrationTest(SPT)procedureinaccordancewithAmericanSocietyforTestingandMaterials(ASTM):D1586.Thistestandsamplingmethodconsistsofdrivingastandard,2-inchoutside-diameter,split-barrelsampleradistanceof18inchesintothesoilwitha140-poundhammerfree-fallingadistanceof30inches.Thenumberofblowsforeach6-inchintervalisNovember28,2010ASSOCiATEDEARTHSCIENC’ES,INC.EWG/th-KE)0028742.ProJecuI2OIOO3B7lKElWPPage2 ISubsurfaceExploration,PreliminaryGeotechnicalProposedEarlyOdidhoodCenterEngineeuin,andInfihtivilonFeasibilityReportRenton,WashinEtonPig/euandSiteConditionsrecorded,andthenumberofblowsrequiredtodrivethesamplerthefinal12inchesisknownastheStandardPenetrationResistance(“N”)orblowcount.Ifatotalof50isrecordedwithinone6-inchinterval,theblowcountisrecordedasthenumberofblowsforthecorrespondingnumberofinchesofpenetration.Theresistance,orN-value,providesameasureoftherelativedensityofgranularsoilsortherelativeconsistencyofcohesivesoils;thesevaluesareplottedontheattachedexplorationboringlogs.Thesamplesobtainedfromthesplit-barrelsamplerwereclassifiedinthefieldandrepresentativeportionsplacedinwatertightcontainers.Thesampleswerethentransportedtoourlaboratoryforfurthervisualclassification.4.0SUBSURFACECONDITIONSSubsurfaceconditionsattheprojectsitewereinferredfromthefieldexplorationsaccomplishedforthisstudy,visualreconnaissanceofthesite,andreviewofselectedapplicablegeologicliterature.Becauseofthenatureofexploratoryworkbelowground,extrapolationofsubsurfaceconditionsbetweenfieldexplorationsisnecessary.Itshouldbenotedthatdifferingsubsurfaceconditionsmaysometimesbepresentduetotherandomnatureofdepositionandthealterationoftopographybypastgradingand/orfilling.Thenatureandextentofanyvariationsbetweenthefieldexplorationsmaynotbecomehillyevidentuntilconstruction.4.1StratigraphySutficialTopsoilOurexplorationboringswhichwerecompletedinunpavedareasgenerallyencounteredapproximately6to8inchesoftopsoilandgrass.Topsoilisnotsuitableforstructuralsupport,andshouldbestrippedfromstructuralareas.Excavatedtopsoilmaybesuitableforreuseinlandscapeareas.ExistingPavingExistingpavingwasencounteredattwooftheexplorationlocations.Measuredpavementthicknessisshownontheexplorationlogs,andrangedfrom1.5to2inches.FillExistingfillwasencounteredinoneofourexplorationborings(EB-7)toadepthofapproximately7feetbelowtheexistinggroundsurface.TheexistingfillwasobservedtobeNovember18,2010AsS0MTEDEARTHSCIEJ’VcEs,INCBY/Glib-KE1X287A2.PrOJeCicI2OJX2BTREIWPPage3 SubsurfaceExploration,Preli,ninwyGeozechnicalProposedEarlyChildhoodCenterEngineering,andInfiltrationFeasibilityReponRenton,WashingtonProjectandSiteConditionsloose,andappearedtoconsistprimarilyofmaterialsderivedon-siteandmovedordisturbedduringearliersitework.ItisworthnotingthathistoricalsiteplansdepicthousesthatpreviouslyexistedinthevicinityofEB-7.Itseemslikelythattheexistingfillwillextendalongthenorthsideofthesiteinthevicinityofthehousesthatweredemolished.Thehousesdonotappearontheoldest,readilyavailableaerialphotographtakenin1990,andmusthavebeendemolishedpriortothen.Theexistingfillislooseandwillrequireremovalorotherremedialpreparationbelowplannedbuildingareasandremedialpreparationbelowplannedpaving.LodgementTillEachoftheexplorationboringsexceptEB-7encounteredmediumdensetoverydensesiltysandwithgravel,interpretedasVashonlodgementtill.Thelodgementtillobservedinourexplorationswasrelativelymoreoxidized,andlessdensethanistypicalforlodgementtillsediments.Thesevariationsarelikelyrelatedtothecontactwiththeunderlyingadvanceoutwashsediments.Promanengineeringstandpoint,thelodgementtillobservedinourexplorationboringscanbeexpectedtoperforminamannersimilartotypicallodgementtillsediments.Lodgementtillwasdepositedatthebaseofanactivecontinentalglacierandwascompactedbytheweightoftheoverlyingglacialice.Lodgementtillissuitableforstructuralsupportwhenproperlyprepared.Excavatedlodgementtillmaterialissuitableforuseinstructuralfillapplicationsifsuitablemoistureconditionsareachievedandifspecificallyallowedbyprojectplansandspecifications,whichwillrequiredryingduringfavorabledryweather.Atthetimeofexploration,weestimatethatmostofthelodgementtillsoilsthatweobservedwereatoraboveoptimummoisturecontentforcompactionpurposes,andtherefore,willrequiredryingduringfavorableweatherpriortocompactioninstructuralfillapplications.AdvanceOunvashEachoftheexplorationboringsencountereddensetoverydensegranularsediments,typicallybelowalodgementtillcap,thatwereinterpretedtorepresentadvanceoutwashsediments.Advanceoutwashwasdepositedatthebaseofanadvancingglacier,andwassubsequentlycompactedbytheweightoftheoverlyingglacialice.Advanceoutwashissuitableforsupportofshallowfoundationsandpavingwithproperpreparation.Excavatedadvanceoutwashsedimentsareexpectedtobesuitableforreuseinstructuralfillapplicationsifspecificallyallowedbyprojectplansandspecifications,andareexpectedtobemoisture-sensitive,thoughsomewhatlessmoisture-sensitivethanJodgmenttillsediments.Itshouldbenotedthatduetothedepthbelowexistinggradewhereadvanceoutwashsedimentswereobserved,itisunlikelythattheywillprovidedirectfoundationsupportforasubstantialpartoftheproject.ItisalsoNoventheri8,2010A550(24TEDEARTHSCIENcES,INC.BWG/ib-kE100287A2.Profeasao)Page4 ISubswfaceExploration.PrethninaiyGeorechnicalProposedEarlyChildhoodCenterEngineering,andInfiltrationFeasthiliryReportRenron,WashingtonProjectandSireConditionsunlikelythatexcavatedadvanceoutwashsedimentswillbeavailableforreuseinstructuralfillapplicationsinsignificantquantity.PublishedGeologicMapWereviewedapublishedgeologicmapofthearea(GeologicMapofKingCounty,Washington,byDerekB.Booth,KathyA.Troost,andAaronP.Wisher,2006).Thereferencedmapindicatesthatthesiteisexpectedtobeunderlainbylodgementtill,withrecessionaloutwashmappedtothewest,andadvanceoutwashmappedtotheeastalongtheMayCreekdrainageanditstributaries.4.2HydrologyflyyTdidnotencountersubstantialgroundwaterinourexplorationsatthetimeofdrilling.IsolatedperchedseepagezoneswereobservedinsomelocationsandarenotedonthesubsurfaceexplorationlogsintheAppendix.WeconstructedawellinexplorationboringEB-1.Establishingaknownunsaturatedthicknessofadvanceoutwashsedimentscanbevaluableininfiltrationsystemdesign,anddatafromthewellinEB-1areexpectedtoprovidesuchevidence.Groundwaterisexpectedtooccurseasonallyatthissite“perched”abovetheunderlyinglodgementtillandadvanceoutwashsediments,andpossiblyaboveexistingfills.Perchedgroundwateroccurswhenverticalinfiltrationisimpededbyless-permeablesoillayers,resultinginhorizontalflow.Thequantityanddurationofperchedgroundwaterflowfromanexcavationwillvary,dependingonseason,soilgradation,andadjacenttopography.Groundwaterconditionsshouldbeexpectedtovaryinresponsetochangesinprecipitation,on-andoff-sitelandusage,andotherfactors,4.3LaboratoryTestingAsapartofourinvestigationoftheinfiltrationpotentialofthesitesoils,wecompletedthreelaboratorygrainsizeanalyses.CopiesofthegrainsizeanalysesreportsareincludedintheAppendix.4.4InfiltrationPotentialThesiteisunderlainbylodgementtill,whichisinturnunderlainbyadvanceoutwashsediments.Lodgementtillissiltyanddense,andisnotsuitableforuseasastormwaterinfiltrationreceptor.Advanceoutwashissuitableforuseasaninfiltrationreceptorundersoniccircumstances,Atthissite,thedepthbelowtheexistinggroundsurfacewhereadvanceNovember18,2010ASSOCiATEDEARTHSCIENCES,INC.BWG/th-K5100287A2-ProjecIsI2OiUOJR7IA’EiWPPage5 SubsurfaceExploration,PreliminaryGeotechnicalProposedEarlychildhoodCenterEngineem-ing,andinfiltrationFeasibilityReportRenron,WashingtonProjectandSireGonditionsoutwashsedimentswereobservedinourexplorationboringsrangedfromapproximately8to14feet.Thesingledeepexplorationboringcompletedforthisstudy,EB-1,encounteredadvanceoutwashsedimentstotheftlldepthexploredof61.5feet.WeinstalledawellinEB-l,anddidnotobservewaterinthewellatthetimeofdrillingoronthefollowingday.Wewillcontinuetosoundthewellforwaterperiodicallythroughthewinterof2010—2011.Theadvanceoutwashsedimentsweobservedtypicallyconsistedofsandwithrelativelysmallamountsofsiltandgravel,andwithsomegradationalstratificationthatistypicalofadvanceoutwashsediments.Inouropinion,theadvanceoutwashweobservedinourinitialexplorationsiswellsuitedtostormwaterinfiltrationusingdeeperinfiltrationstrategies,suchasinfiltrationtrenches,rock—filled“pitdrains”,orUICwells.Useofanyoftheseinfiltrationmethodsinafinaldesignshouldbebasedonaninfiltrationstudythatisspecifictotheinfiltrationsystemdesignandlocation.Weareavailabletoworkwiththeprojectcivilengineertohelpdevelopapreliminarystormwatermanagementplan,andtoformulateaninfiltrationstudythatisconsistentwiththepreliminaryplan.November18,2010ASSOCIATEDEARTHScIENCES,INC.BWGJiø-KE!GWS742-ProfecisI2OI&O287iKEWVPPage6 ISubsutfaceEzplorarion,PreliminanGeorechnicalProposedEarlyChildhood&uerEngineering,andInfiltrationFeasibtho’ReportRenron,WashingtonGeologicHazardsandMitigationsII.GEOLOGICHAZARDSANDMITIGATIONSIThefollowingdiscussionofpotentialgeologichazardsisbasedonthegeologic,slope,andgroundandsurfacewaterconditions,asobservedanddiscussedherein.Thediscussionwillbelimitedtoslopestability,seismic,anderosionissues.5.0SLOPEHAZARDSANDMITIGATIONSInouropinion,noslopesonoradjacenttothesitemeetapplicabledefinitionsformanagementascriticalareasinaccordancewithRentonMunicipalCodeSection4-3-050.Nodetailedslopestabilityanalysiswascompletedforthisstudy,andnoneiswarranted,inouropinion.6.0SEISMICHAZARDSANDMITIGATIONSThesitedoesnotcontainareasthatmeetCityofRentondefinitionsforhighseismichazardareas.ThefollowingdiscussionisamoregeneralassessmentofseisnilchazardsthatisintendedtobeusefultotheDistrictintermsofunderstandingseismicissues,andtothestructuralengineerforfinalstructuraldesign.EarthquakesoccurregularlyinthePugetLowland.Themajorityoftheseeventsaresmallandareusuallynotfeltbypeople.However,largeearthquakesdooccur,asevidencedbythe1949,7.2-magnitudeevent;the2001,6.8-magnitudeevent;andthe1965,6.5-magnitudeevent.The1949earthquakeappearstohavebeenthelargestinthisregionduringrecordedhistoryandwascenteredintheOlympiaarea.Evaluationofearthquakereturnratesindicatesthatanearthquakeofthemagnitudebetween5.5and6.0islikelywithinagiven20-yearperiod.Generally,therearefourtypesofpotentialgeologichazardsassociatedwithlargeseismicevents:1)surficialgroundrupture,2)seismicallyinducedlandslides,3)liquefaction,and4)groundmotion.Thepotentialforeachofthesehazardstoadverselyimpacttheproposedprojectisdiscussedbelow.6.1SurficialGroundRuptureGenerally,thelargestearthquakesthathaveoccurredinthePugetSoundareaaresub-crustaleventswithepicentersrangingfrom50to70kilometersindepth.Earthquakesthataregeneratedatsuchdepthsusuallydonotresultinfaultruptureatthegroundsurface.CurrentNovemberI&2010ASSOCIATEDEARTHScIENCES,WCBY,uThb-KEIØIS7%2.Projeasi2O]0028ZKE’WPPage7 SubsutfaceExploration,PreliminaryGeorechnicalProposedEarlyChildhoodcenterEngineering,andhLfllrrationFeasibilityReportRenton.WashingtonGeologicHazardsandMitigationsresearchindicatesthatsurficialgroundruptureispossibleinareasclosetotheSeattleFaultZone.Althoughourcurrentunderstandingofthisfaultzoneislimitedandisanactiveareaofresearch,thesiteliessouthofthecurrentlyrecognizedlimitsoftheSeattleFaultZone.Therefore,basedoncurrentinformation,theriskofdamagetoplannedimprovementsasaresultofsurfaceruptureduetofaultingislow,inouropinion.6.2SeismicallyInducedLandslidesItisouropinionthatthepotentialriskofdamagetotheproposeddevelopmentbyseismicallyinducedslopefailuresislowduetothelackofsignificantslopesonandadjacenttothesite.6.3LiquefactionLiquefactionisaprocessthroughwhichunconsolidatedsoillosesstrengthasaresultofvibrations,suchasthosewhichoccurduringaseismicevent.Duringnormalconditions,theweightofthesoilissupportedbybothgrain-to-graincontactsandbythefluidpressurewithintheporespacesofthesoilbelowthewatertable.Extremevibratoryshakingcandisruptthegrain-to-graincontact,increasetheporepressure,andresultinatemporarydecreaseinsoilshearstrength.Thesoilissaidtobeliquefiedwhennearlyalloftheweightofthesoilissupportedbyporepressurealone.Liquefactioncanresultindeformationofthesedimentandsettlementofoverlyingstructures.Areasmostsusceptibletoliquefactionincludethoseareasunderlainbynon-cohesivesiltandsandwithlowrelativedensities,accompaniedbyashallowwatertable.Thesubsurfaceconditionsencounteredatthesiteposelittleriskofliquefactionduetorelativelyhighdensityofthelodgementtillandadvanceoutwash,highsiltcontentofthelodgementtill,andlackofsignificantgroundwaterobservedinourexplorations.Nodetailedliquefactionanalysiswascompletedaspartofthisfinalstudy,andnoneiswarranted,inouropinion.6.4GroundMotionStructuraldesignofbuildingsshouldfollow2009InternationalBuildingC’ode(IBC)standardsusingSiteClass“C”inaccordancewithTable1613.5.2.The2009IECmappedspectralaccelerationsforshortperiod(Ss)and1-secondperiod(Si)spectralaccelerationvaluesweredeterminedbythelatitudeandlongitudeoftheprojectsitesusingtheUnitedStatesGeologicalSurvey(USGS)softwareutilitySeismicHazardCurvesandUniformResponseSpectra.TheUSGSsoftwareinterpolatedgroundmotionsattheprojectsiteasfollowsforperiodsof0.2and1.0seconds,respectively,witha2percentchanceofexceedencein50years:Ss=1.434,November18,2010ASSOCIATEDEARTHSCiENcES,INC.BY/C/lb-KEJX1B7A2.PmJeasi2OIOOJ&71KEIW?Page8 ISubsurfaceExploration,PreliminaryGeorechnicalProposedEarlyChildhoodCenterEngineering,andInfiltrationFeasibilityReportRenion,WashingtonGeologicHazardsandMitigationsS=0.490.Basedon2009IECtables1613.5.3(1)and(2),anFavalueof1.0andanFvalueof1.31shouldbeused.7.0EROSIONHAZARDSANDMITIGATIONSThesitecontainssoilsthatmeetCityofRentondefinitionsforErosionHazardAreas.ThefollowingdiscussionaddressesWashingtonStateDepartmentofEcologyerosioncontrolregulationsthatwillbeapplicabletotheproject.TheStaterequirementsarerelativelynewandareextensive.WeanticipatethatiftheprojectcomplieswithStaterequirements,itwillalsobeacceptablewithrespecttoCityofRentonrequirements.AsofOctober1,2006,theWashingtonStateDepartmentofEcology(Ecology)ConstructionStormWaterGeneralPermit(alsoknownastheNationalPollutantDischargeEliminationSystem[NPDES]permit)requiresweeklyTemporaryErosionandSedimentationControl(TESC)inspectionsandturbiditymonitoringforallsites1ormoreacresinsizethatdischargestormwatertosurfacewatersofthestate.Becauseweanticipatethattheproposedprojectwillrequiredisturbanceofmorethanoneacre,weanticipatethattheseinspectionandreportingrequirementswillbetriggered.Thefollowingrecommendationsarerelatedtogeneralerosionpotentialandmitigation.Theerosionpotentialofthesitesoilsishigh.Themosteffectiveerosioncontrolmeasureisthemaintenanceofadequategroundcover.Maintainingcovermeasuresatopdisturbedgroundprovidesthegreatestreductiontothepotentialgenerationofturbidrunoffandsedimenttransport.Duringthelocalwetseason(October1”throughMarch3P),exposedsoiLshouldnotremainuncoveredformorethan2daysunlessitisactivelybeingworked.Ground-covermeasurescanincludeerosioncontrolmatting,plasticsheeting,strawmulch,crushedrockorrecycledconcrete,ormaturehydroseed.Somefine-grainedsurfacesoilsaretheresultofnaturalweatheringprocessesthathavebrokendownparentmaterialsintotheirmineralcomponents.Thesemineralcomponentscanhaveaninherentelectricalcharge.Electricallychargedmineralfineswillattractoppositelychargedparticlesandcancombine(flocculate)toformlargerparticlesthatwillsettleoutofsuspension.ThesedimentsproducedduringtherecentglaciationofPugetSoundare,however,mostcommoniythesuspendedsoilsthatarecarriedbysitestormwater.Thefine-grainedfractionoftheglaciallyderivedsoilisreferredtoas“rockflour,”whichisprimarilyasilt-sizedparticlewithnoelectricalcharge.Theseparticles,oncesuspendedinwater,mayhavesettlingtimesinperiodsofmonths.November18,2010ASSOCIATEDEARTHSCIENCES,INC.BWC/th-K5100287A2.PnJecul2O)OO2S7mKaWPPage9 SUbSiUaceExploration,PreliminaryGeotecimicalProposedEarlyChildhoodCenterEngineering,andInflltrario,zFeasibilityReportRenton,WashingtonGeologicHazardsandMitigationsTherefore,theflowlengthwithinatemporarysedimentcontroltraporpondhasvirtuallynoeffectonthewaterqualityofthedischarge,sinceitwillnotsettleoutofsuspensioninthetimeittakestoflowfromoneendofthepondtotheother.Reductionofturbidityftomaconstructionsiteisalmostentirelyafunctionofcovermeasuresandflowcontrol.Temporarysedimenttrapsandpondsarenecessarytocontrolthereleaserateoftherunoffandtoprovideacatchmentforsand-sizedandlargersoilparticles,butareveryineffectiveatreducingtheturbidityoftherunoff.Tomitigatetheerosionhazardsandpotentialforoff-sitesedimenttransport.werecommendthefollowing:1.Thewinterperformanceofasiteisdependentonawell-conceivedplanforcontrolofsiteerosionandstormwaterrunoff.Itiseasiertokeepthesoilonthegroundthantoremoveitfromstormwater.Theownerandthedesignteamshouldincludeadequateground-covermeasures,accessroads,andstagingareasintheprojectbidtogivetheselectedcontractoraworkablesite.Theselectedcontractorneedstobepreparedtoimplementandmaintaintherequiredmeasurestoreducetheamountofexposedground.AsitemaintenanceplanshouldbeinplaceintheeventstormwaterturbiditymeasurementsaregreaterthantheEcologystandards.2.AllTESCmeasuresforagivenarea,tobegradedorotherwiseworked,shouldbeinstalledpriortoanyactivitywithinthatarea.Therecommendedsequenceofconstructionwithinagivenareawouldbetoinstallsedimenttrapsand/orpondsandestablishperimeterflowcontrolpriortostartingmassgrading.3.Duringthewettermonthsoftheyear,orwhenlargestormeventsarepredictedduringthesummermonths,eachworkareashouldbestabilizedsothatifshowersoccur,theworkareacanreceivetherainfallwithoutexcessiveerosionorsedimenttransport.Therequiredmeasuresforanareatobe“buttoned-up”willdependonthetimeofyearandthedurationtheareawillbeleftun-worked.Duringthewintermonths,areasthataretobeleftun-workedformorethan2daysshouldbemulchedorcoveredwithplastic.Duringthesummermonths,stabilizationwillusuallyconsistofseal-rollingthesubgrade.Suchmeasureswillaidinthecontractor’sabilitytogetbackintoaworkareaafterastormevent.Thestabilizationprocessalsoincludesestablishingtemporarystormwaterconveyancechannelsthroughworkareastorouterunofftotheapprovedtreatmentfacilities.November18,2010ASSOcIATEDEARTHSCIENCES,INC.Page10BWG/ib—KE!00287A1-Projectsl2OIOO2B7LKElWP ISuhsu,faceExploration,PreliminaryGeotechnicalIProposedEarlyChildhoodCenterEngineering,andJnfllr;mioizFeasihillryReportRenton,WashingtonGeologicHazardsandMitigations4.Alldisturbedareasshouldberevegetatedassoonaspossible.Ifitisoutsideofthegrowingseason,thedisturbedareasshouldbecoveredwithmulch,asrecommendedintheerosioncontrolplan.Strawmulchprovidesthemostcost-effectivecovermeasureandcanbemadewind-resistantwiththeapplicationofatackifierafteritisplaced.5.Surfacerunoffanddischargeshouldbecontrolledduringandfollowingdevelopment.IUncontrolleddischargemaypromoteerosionandsedimenttransport.Undernocircumstancesshouldconcentrateddischargesbeallowedtoflowoversignificantslopes.6.Soilsthataretobereusedaroundthesiteshouldbestoredinsuchamannerastoreduceerosionfromthestockpile.Protectivemeasuresmayinclude,butarenotlimitedto,coveringwithplasticsheeting,theuseoflowstockpilesinflatareas,ortheuseofstrawbales/siltfencesaroundpileperimeters.DuringtheperiodbetweenOctober1aandMarch31s,thesemeasuresarerequired.7.On-siteerosioncontrolinspectionsandturbiditymonitoringshouldbeperformedinIaccordancewithEcologyrequirements.WeeklyandmonthlyreportingtoEcologyshouldbeperformedonaregularlyscheduledbasis.TESCmonitoringshouldbepartoftheweeklyconstructionteammeetings.TemporaryandpermanenterosioncontrolIanddrainagemeasuresshouldbeadjustedandmaintained,asnecessary,atthetimeofconstruction.ItisouropinionthatwiththeproperimplementationoftheTESCplansandbyfield-adjustingappropriatemitigationelements(BMPs)duringconstruction,asrecommendedbytheerosioncontrolinspector,thepotentialadverseimpactsfromerosionhazardsontheprojectmaybemitigated.IIIINovember18,2010ASSOCMTEDEARTHSCIENCES.INC.OWO/ib-KE100287A2.Projeail2OIOO28llKEIWPPage111 SubsurfaceExploration,PreliminaryGeosecimicalProposedEarlyChildhoodCenterEngineering,andhzflhrrario;zFeasibilityReportRemon,WashingtonPreliminatyDesignRecommendationsIll.PRELIMINARYDESIGNRECOMMENDATIONS8.0INTRODUCTIONSomeportionsofthesiteareunderlainbyalayerofsurficialexistingfillthatislooseandvariable.Existingfillisnotsuitableforsupportofnewfoundationsandwarrantsremedialpreparationwhereitoccursbelowpavingandsimilarlightlyloadedstructures.Structuralfillornativesedimentsaresuitableforsupportofshallowfoundations,floorslabs,andpavingwithproperpreparation.9.0SITEPREPARATIONExistingfoundations,floorslabs,paving,buriedutilities,vegetation,topsoil,andanyotherdeleteriousmaterialsshouldberemovedwheretheyarelocatedbelowplannedconstructionareas.Alldisturbedsoilsresultingfromdemolitionactivitiesshouldberemovedtoexposeunderlyingundisturbednativesedimentsandreplacedwithstructuralfill,asneeded.Allexcavationsbelowfinalgrademadefordemolitionactivitiesshouldbebackfilled,asneeded,withstructuralfill.ErosionandsurfacewatercontrolshouldbeestablishedaroundtheclearinglimitstosatisfylocalrequireinentsOncedemolitionhasbeencompleted,existingfillshouldbeaddressed.TheobservedfilldepthinEB-7wasapproximately7feetbelowexistinggrade.Weanticipatethatexistingfillwillalsobepresentbelowandaroundtheexistingbuilding,andassociatedwithburiedutilities.Werecommendthatexistingfillberemovedfrombelowareasofplannedfoundationstoexposeunderlyingundisturbednativesediments,followedbyrestorationoftheplannedfoundationgradewithstructuralfill.Removalofexistingfillshouldextendlaterallybeyondthebuildingfootprintbyadistanceequaltothedepthofoverexcavation.Forexample,ifexistingfillisremovedtoadepthof2feetbelowaplannedfootingarea,theexcavationshouldalsoextendlaterally2feetbeyondthefootinglimits.Careshouldbetakennottodisturbsupportsoilsofexistingfoundationsofstructuresthatwillremain.Supportsoilsshouldbeconsideredthosesoilswithinaprismprojecteddownwardandoutwardfromexistingfootingsatinclinationsof111:1V(Horizontal:Vertical),Whereexistingfillisremovedandreplacedwithstructuralfill,conventionalshallowfoundationsmaybeusedforbuildingsupport.Noventher18,2010ASSOCIATEDEARTHSCIENCES,INC.-KE10023742-Projettsl2O?002871KE1WFPage12 ISubsurfaceExploration,PreliminazyGeorechnicalProposedEarlyChildhood‘enterEngineering,andInfiltrationFeasibiliryReportRenton,WashingtonPreliminaryDesignRecommendations9.1SiteDrainageandSurfaceWaterControlThesiteshouldbegradedtopreventwaterfrompondinginconstructionareasand/orflowingintoexcavations.Exposedgradesshouldbecrowned,sloped,andsmoothdrum-rolledattheendofeachdaytofacilitatedrainage.Accumulatedwatermustberemovedfromsubgradesandworkareasimmediatelypriortoperformingfurtherworkinthearea.Equipmentaccessmaybelimited,andtheamountofsoilrenderedunfitforuseasstructuralfillmaybegreatlyincreased,ifdrainageeffortsarenotaccomplishedinatimelysequence.Ifaneffectivedrainagesystemisnotutilized,projectdelaysandincreasedcostscouldbeincurredduetothegreaterquantitiesofwetandunsuitablefill,orpooraccessandunstableconditions.Ourexplorationboringsdidnotencountersubstantialfreegroundwateratthetimeofexploration.Weanticipatethatperchedgroundwatercouldbeencounteredinexcavationscompletedduringconstruction.Wedonotanticipatetheneedforextensivedewateringinadvanceofexcavations.Thecontractorshouldbepreparedtointerceptanygroundwaterseepageenteringtheexcavationsandrouteittoasuitabledischargelocation.Finalexteriorgradesshouldpromotefreeandpositivedrainageawayfromthebuildingsatalltimes.Watermustnotbeallowedtopondortocollectadjacenttofoundationsorwithintheimmediatebuildingarea.Werecommendthatagradientofatleast3percentforaminimumdistanceof10feetfromthebuildingperimetersbeprovided,exceptinpavedlocations.Inpavedlocations,aminimumgradientof1percentshouldbeprovided,unlessprovisionsareincludedforcollectionanddisposalofsurfacewateradjacenttothestructures.9.2SubgradeProtectionTotheextentthatitispossible,existingpavementshouldbeusedforconstructionstagingareas.Ifbuildingconstructionwillproceedduringthewinter,werecommendtheuseofaworkingsurfaceofsandandgravel,crushedrock,orquarryspallstoprotectexposedsoils,particularlyinareassupportingconcentratedequipmenttraffic.Inwinterconstructionstagingareasandareasthatwillbesubjectedtorepeatedheavyloads,suchasthosethatoccurduringconstructionofmasonrywalls,aminimumthicknessof12inchesofquarryspallsorlBinchesofpitrunsandandgravelisrecommended.Ifsubgradeconditionsaresoftandsilty,ageotextileseparationfabric,suchasMirafi500xorapprovedequivalent,shouldbeusedbetweenthesubgradeandthenewfill.Forbuildingpadswherefloorslabsandfoundationconstructionwillbecompletedinthewinter,asimilarworkingsurfaceshouldbeused,composedofatleast6inchesofpitrunsandandgravelorcrushedrock.Constructionofworkingsurfacesfromadvancingfillpadscouldbeusedtoavoiddirectlyexposingthesubgradesoilstovehiculartraffic.Novemberi8,2010ASSOC’IATEDEARTHSUENcES,INC.BWG/Ib-KE1287,1-ProJern2v)X23r.KEWPPage13 SubsutfaceExploration,PreliminaryGeorechnicalProposedEarl)’Childhood‘enrerEngineering,andInfiltrationFeasibilityReportReman,WashingtonPreliminaryDesignRecommendationsFoundationsubgradesmayrequireprotectionfromfootandequipmenttrafficandpondingofrunoffduringwetweatherconditions.Typically,compactedcrushedrockoralean-mixconcretematplacedoveraproperlypreparedsubgradeprovidesadequatesubgradeprotection.Foundationconcreteshouldbeplacedandexcavationsbackfilledassoonaspossibletoprotectthebearingsurface.9.3Proof-RollingandSubgradeCompactionFollowingtherecommendeddemolition,sitestripping,andplannedexcavation,thestrippedsubgradewithinthebuildingareasshouldbeproof-rolledwithheavy,rubber-tiredconstructionequipment,suchasafullyloadedtandem-axledumptruck.Proof-rollingshouldbeperformedpriortostructuralfillplacementorfoundationexcavation.Theproof-rollshouldbemonitoredbythegeotechnicalengineersothatanysoftoryieldingsubgradesoilscanbeidentified.Anysoft/loose,yieldingsoilsshouldberemovedtoastablesubgrade.Thesubgradeshouldthenbescarified,adjustedinmoisturecontent,andrecompactedtotherequireddensity.Proof-rollingshouldonlybeattemptedifsoilmoisturecontentsareatornearoptimummoisturecontent.Proof-rollingofwetsubgradescouldresultinfurtherdegradation.Lowareasandexcavationsmaythenberaisedtotheplannedfinishedgradewithcompactedstructuralfill.Subgradepreparationandselection,placement,andcompactionofstructuralfillshouldbeperformedunderengineering-controlledconditionsinaccordancewiththeprojectspecifications.9.4Overexcavation/StabilizationConstructionduringextendedwetweatherperiodscouldcreatetheneedtooverexcavateexposedsoilsiftheybecomedisturbedandcannotberecompactedduetoelevatedmoisturecontentand/orweatherconditions.Evenduringdryweatherperiods,soft/wetsoils,whichmayneedtobeoverexcavated,maybeencounteredinsomeportionsofthesite.Ifoverexcavacionisnecessary,ftshouldbeconfirmedthroughcontinuousobservationandtestingbyAssociatedEarthSciences,Inc.(AESI).Soilsthathavebecomeunstablemayrequireremedialmeasuresintheformofoneormoreofthefollowing:1.Dryingandrecompaction.Selectivedryingmaybeaccomplishedbyscarifyingorwindrowingsurficialmaterialduringextendedperiodsofdryandwarmweather.2.Removalofaffectedsoilstoexposeasuitablebearingsubgradeandreplacementwithcompactedstructuralfill.3.Mechanicalstabilizationwithacoarse-crushedaggregatecompactedintothesubgrade,possiblyinconjunctionwithageotextile.4.Soil/cementadmixturestabilization.November18,2010ASSOCIATEDEARTHSCIENCES,INC.BWGJth-KE100287A2.Projecisi2Oiø2S7iKEIWPPage14 ISubsiafaceExploration,PreliminaryGeotechnicalProposedEarl)’ChildhoodCenterEngineering,andInfiltrationFeasibiliryRepairkenton,WashingtonPreliminanDesignRecommendations9.5WetWeatherConditionsIfconstructionproceedsduringanextendedwet-weatherconstructionperiodandthemoisturesensitivesitesoilsbecomewet,theywillbecomeunstable.Therefore,thebidsforsitegradingoperationsshouldbebaseduponthetimeofyearthatconstructionwillproceed.Itisexpectedthatinwetconditionsadditionalsoilsmayneedtoberemovedand/orotherstabilizationmethodsused,suchasacoarsecrushed-rockworkingmat,todevelopastableconditionifsiltysubgradesoilsaredisturbedinthepresenceofexcessmoisture.Theseverity’ofconstructiondisturbanceIwillbedependent,inpart,ontheprecautionsthataretakenbythecontractortoprotectthemoisture-anddisturbance-sensitivesitesoils.Ifoverexcavationisnecessary,itshouldbeconfirmedthroughcontinuousobservationandtestingbyarepresentativeofourfirm.9.6TemporaryandPermanentCutSlopesInouropinion,stableconstructionslopesshouldbetheresponsibilityofthecontractorandshouldbedeterminedduringconstruction.Forestimatingpurposes,however,weanticipatethattemporary,unsupportedcutslopesintheexistingfillcanbemadeatamaximumslopeof1.511:1Vorflatter.Temporaryslopesinunsaturatedadvanceoutwashsedimentsandlodgementtillmaybeplannedat111:1V.Asistypicalwithearthworkoperations,somesloughingandravelingmayoccur,andcutslopesmayhavetobeadjustedinthefield.Ifgroundwaterseepageisencounteredincutslopes,orifsurfacewaterisnotroutedawayfromtemporarycutslopefaces,flatterslopeswillberequired.Inaddition,WISHA/OSHAregulationsshouldbefollowedatalltimes,Permanentcutandstructuralfillslopesthatarenotintendedtobeexposedtosurfacewatershouldbedesignedatinclinationsof211:1Vorflatter,Allpermanentcutorfillslopesshouldbecompactedtoatleast95percentofthemodifiedProctortnaximumdrydensity,asdeterminedbyASTM:D1557,andtheslopesshouldbeprotectedfromerosionbysheetplasticuntilvegetationcovercanbeestablishedduringfavorableweather.9.7FrozenSubgradesIfearthworktakesplaceduringfreezingconditions,allexposedsubgradesshouldbeallowedtothawandthenberecornpactedpriortoplacingsubsequentliftsofstructuralfillorfoundationcomponents.Alternatively,thefrozenmaterialcouldbestrippedfromthesubgradetorevealunfrozensoilpriortoplacingsubsequentliftsoffillorfoundationcomponents.Thefrozensoilshouldnotbereusedasstructuralfilluntilallowedtothawandadjustedtothepropermoisturecontent,whichmaynotbepossibleduringwintermonths.November18,2010ASSOCIATEDEARTHSCIENCES,INC.OWG/tb—K5100287A2ProJeac2O!OO28tKEtWPPage15 SubsnfaceErplorarion,PrelinilnanGeotechnicalProposedEarlyChildhoodcenterEngineering,and!nfilumionFeasibilityReportReman,WashingtonPreliminan’DesignRecommendations10.0STRUCTURALFILLAllreferencestostructuralfillinthisreportrefertosubgradepreparation,filltypeandplacement,andcompactionofmaterials,asdiscussedinthissection.Ifapercentageofcompactionisspecifiedunderanothersectionofthisreport,thevaluegiveninthaisectionshouldbeused.Afterstripping,plannedexcavation!andanyrequiredoverexcavanonhavebeenperformedtothesatisfactionofthegeotechnicalengineer,theupper12inchesofexposedgroundinareastoreceivefillshouldberecompactedto90percentofthemodifiedProctormaximumdensityusingASTM:D1557asthestandard.Ifthesubgradecontainssiltysoilsandtoomuchmoisture,adequaterecompactionmaybedifficultorimpossibletoobtainandshouldprobablynotbeattempted.Inlieuofrecompaction,theareatoreceivefillshouldbeblanketedwithwashedrockorquarryspallstoactasacapillarybreakbetweenthenewfillandthewetsubgrade.Wheretheexposedgroundremainssoftandfurtheroverexcavationisimpractical,placementofanengineeringstabilizationfabricmaybenecessarytopreventcontaminationofthefree-draininglayerbysiltmigrationfrombelow.Afterrecompactionoftheexposedgroundistestedandapproved,orafree-drainingrockcourseislaid,structuralfillmaybeplacedtoattaindesiredgrades.Structuralfillisdefinedasnon-organicsoil,acceptabletothegeotechnicalengineer,placedinmaximum8-inchlooselifts,witheachliftbeingcompactedto95percentofthemodifiedProctormaximumdensityusingASTM:D1557asthestandard.Useofsoilsfromthesiteinstructuralfillapplicationsisacceptableifthematerialmeetstheprojectspecificationsfortheintendeduse,andifspecificallyallowedbyprojectspecifications.Inthecaseofroadwayandutilitytrenchfilling,thebackfillshouldbeplacedandcompactedinaccordancewithcurrentCityofRentoncodesandstandards.Thetopofthecompactedfillshouldextendhorizontallyoutwardaminimumdistanceof3feetbeyondthelocationsoftheroadwayedgesbeforeslopingdownatanangleof2H:1V.ThecontractorshouldnotethatanyproposedfillsoilsmustbeevaluatedbyAESIpriortotheiruseinfills.Thiswouldrequirethatwehaveasampleofthematerial72hoursinadvancetoperformaProctortestanddetermineitsfieldcompactionstandard.Soilsinwhichtheamountoffine-grainedmaterial(smallerthantheNo.200sieve)isgreaterthanapproximately5percent(measuredontheminusNo.4sievesize)shouldbeconsideredmoisture-sensitive.Useofmoisture-sensitivesoilinstructuralfillsshouldbelimitedtofavorabledryweatherconditions,andisonlypermittedifspecificallyallowedbyprojectplansandspecifications,Thenativeandexistingfillsoilspresenton-sitecontainedsignificantamountsofsiltandareconsideredhighlymoisture-sensitive.Inaddition,constructionequipmenttraversingthesitewhenthesoilsarewetcancauseconsiderabledisturbance.IffillisplacedduringwetweatherNovember18,2010ASSOcIATEDEARTHScIENcES,INC.BWGJW—KEJOOZS7A2-Profec!sI2OJOO2S7IKEIWPPage16 ISubsutaceExploration,PreliminaryGeorechnicalProposedEarlyChildhoodCenterEngineering,andInfiltrationFeasibilityReportRenron,14’ashingtonPreliminaryDesignRecommendationsorifpropercompactioncannotbeobtained,aselectimportmaterialconsistingofaclean,free-draininggraveland/orsandshouldbeused.Free-drainingfillconsistsofnon-organicsoilwiththeamountoffine-grainedmateriallimitedto5percentbyweightwhenmeasuredontheminusNo.4sievefractionwithatleast25percentretainedontheNo.4sieve.Arepresentativeftomourfirmshouldinspectthestrippedsubgradeandbepresentduringplacementofstructuralfilltoobservetheworkandperformarepresentativenumberofin-placedensitytests.Inthisway,theadequacyoftheearthworkmaybeevaluatedasfillingprogresses,andanyproblemareasmaybecorrectedatthattime.ftisimportanttounderstandthattakingrandomcompactiontestsonapart-timebasiswillnotassureuniformityoracceptableperformanceofafill.Assuch,weareavailabletoaidtheDistrictindevelopingasuitablemonitoringandtestingprogram.11.0FOUNDATIONSSpreadfootingsmaybeusedforbuildingsupportwhenfoundeddirectlyonundisturbedlodgementtill,advanceoutwash,oronstructuralfillplacedabovesuitablenativedeposits,aspreviouslydiscussed.Werecommendthatanallowablebearingpressureof3,000poundspersquarefoot(psf)beusedfordesignpurposes,includingbothdeadandliveloads.Anincreaseofone-thirdmaybeusedforshort-termwindorseismicloading.Higherfoundationsoilbearingpressuresarepossibleforfoundationssupportedentirelyonundisturbedlodgementtillandadvanceoutwash,however,wedonotexpectthathigherbearingpressureswillbeneeded.Ifhigherfoundationsoilbearingpressuresareneeded,weshouldbeallowedtooffersituation-specificrecommendations.Perimeterfootingsshouldbeburiedatleast18inchesintothesurroundingsoilforfrostprotection.However,allfootingsmustpenetratetotheprescribedbearingstratum,andnofootingshouldbefoundedinoraboveorganicorloosesoils.Allfootingsshouldhaveaminimumwidthof18inches.Itshouldbenotedthattheareaboundbylinesextendingdownwardat1H:1Vfromanyfootingmustnotintersectanotherfootingorintersectafilledareathathasnotbeencompactedtoatleast95percentofASTM:D1557.Inaddition,aI.5H:IVlineextendingdownfromanyfootingmustnotdaylightbecausesloughingorravelingmayeventuallyunderminethefooting.Thus,footingsshouldnotbeplacedneartheedgeofstepsorcutsinthebearingsoils.Anticipatedsettlementoffootingsfoundedasdescribedaboveshouldbeontheorderof¾inchorless.However,disturbedsoilnotremovedfromfootingexcavationspriortofootingplacementcouldresultinincreasedsettlements.AllfootingareasshouldbeinspectedbyAESJNovember18,2010ASSOCIATEDEARTHSCIENcES,INC.Dwcnb—KEm7:8z42.Pr*cIs2oIoo2sTKswpPage17 Subsu,jäce&ploration,PreliminaryGeorechnicalProposedEarl)’ChildhoodCenterEngineering,andInfilirarionFeasibilityReportkenton,WashingtonPreliminaryDesignRecam,nendarthnspriortoplacingconcretetoverii’thatthedesignbearingcapacityofthesoilshasbeenattainedandthatconstructionconformstotherecommendationscontainedinthisreport.Suchinspectionsmayberequiredbythegoverningmunicipality.Perimeterfootingdrainsshouldbeprovided,asdiscussedunderthe“DrainageConsiderations”sectionofthisreport.11.1DrainageConsiderationsFoundationsshouldbeprovidedwithfoundationdrains.Drainsshouldconsistofrigid,perforated,polyvinylchloride(PVC)pipesurroundedbywashedpeagravel.Thedrainsshouldbeconstructedwithsufficientgradienttoallowgravitydischargeawayfromtheproposedbuildings.Roofandsurfacerunoffshouldnotdischargeintothefootingdrainsystem,butshouldbehandledbyaseparate,rigid,tightlinedrain.Inplanning,exteriorgradesadjacenttowallsshouldbeslopeddownwardawayfromtheproposedstructurestoachievesurfacedrainage.12.0FLOORSUPPORTFloorslabscanbesupportedonsuitablenativesediments,oronstructuralfillplacedabovesuitablenativesediments.Floorslabsshouldbecastatopaminimumof4inchesofclean,washed,crushedrockorpeagraveltoactasacapillan’break.Areasofsubgradethataredisturbed(loosened)duringconstructionshouldbecompactedtoanon-yieldingconditionpriortoplacementofcapillarybreakmaterial.Floorslabsshouldalsobeprotectedfromdampnessbyanimperviousmoisturebarrieratleast10milsthick.Themoisturebarriershouldbeplacedbetweenthecapillarybreakmaterialandtheconcreteslab.13.0FOUNDATIONWALLSAllbackfillbehindfoundationwallsoraroundfoundationunitsshouldbeplacedasperourrecommendationsforstructuralfillandasdescribedinthissectionofthereport.Horizontallybackfilledwalls,whicharefreetoyieldlaterallyatleast0.1percentoftheirheight,maybedesignedusinganequivalentfluidequalto35poundspercubicfoot(pcfl.Fullyrestrained,horizontallybackfilled,rigidwallsthatcannotyieldshouldbedesignedforanequivalentfluidof50pcf.Wallswithslopingbackfilluptoamaximumgradientof2H:1Vshouldbedesignedusinganequivalentfluidof55pcfforyieldingconditionsor75pcfforfullyrestrainedconditions.Ifparkingareasareadjacenttowalls,asurchargeequivalentto2feetofsoilshouldbeaddedtothewallheightindetermininglateraldesignforces.November18,2010ASSOCIATEDEARTHSCIENCES,INC.BWG/th-KE10028742-ProJeclsL’OlOO287lK5WPPage18 ISubsiofaceExploration,PreliminaryGeorechnicalProposedEarl)’ChildhoodCenterEngineering,andInfiltrationFeasibilityReportRenron,WashingtonPreliminaryDesignRecommendationsAsrequiredbythe2009IBC,retainingwalldesignshouldincludeaseismicsurchargepressureinadditiontotheequivalentfluidpressurespresentedabove.Consideringthesitesoilsandtherecommendedwallbackfillmaterials,werecommendaseismicsurchargepressureof511and1011psf,whereHisthewallheightinfeet,forthe‘active”and‘at-rest”loadingconditions,respectively.TheseismicsurchargeshouldbemodeledasarectangularIdistributionwiththeresultantappliedatthemidpointofthewalls.ThelateralpressurespresentedabovearebasedontheconditionsofauniformbackfillIconsistingofexcavatedon-sitesoils,orimportedstructuralfillcompactedto90percentofASTM:D1557.Ahigherdegreeofcompactionisnotrecommended,asthiswillincreasethepressureactingonthewalls.Alowercompactionmayresultinsettlementoftheslab-on-gradeorotherstructuressupportedabovethewalls.Thus,thecompactionleveliscriticalandmustbetestedbyourfirmduringplacement.Surchargesfromadjacentfootingsorheavyconstructionequipmentmustbeaddedtotheabovevalues.Perimeterfootingdrainsshouldbeprovidedforallretainingwalls,asdiscussedunderthe“DrainageConsiderations”sectionofthisreport.Itisimperativethatproperdrainagebeprovidedsothathydrostaticpressuresdonotdevelopagainstthewalls,Thiswouldinvolveinstallationofaminimum,1-foot-wideblanRetdraintowithin1footoffinishgradeforthefullwallheightusingimported,washedgravelagainstthewalls.13.1PassiveResistanceandFrictionFactorsLateralloadscanberesistedbyfrictionbetweenthefoundationandthenaturalglacialsoilsorsupportingstructuralfillsoils,andbypassiveearthpressureactingontheburiedportionsofthefoundations.Thefoundationsmustbebackfilledwithstructuralfillandcompactedtoatleast95percentofthemaximumdrydensitytoachievethepassiveresistanceprovidedbelow.Werecommendthefollowingallowabledesignparameters:•Passiveequivalentfluid=250pef•Coefficientoffriction=0.3014.0PAVEMENTRECOMMENDATIONSPavementareasshouldbepreparedinaccordancewiththe“SitePreparation”sectionofthisreport.Ifthestrippednativesoilorexistingfillpavementsubgradecanbecompactedto95percentofASTM:D1557andisfirmandunyielding,noadditionaloverexcavationisNovember18,2010ASSOcIATEDEARTHSCIENCES,INC.DWU/th-KE!X287A2-ProJec!r20!OO28TKtWPPage19 Subsu,face&plorarion,P,’ellminanGeotechnicalProposedEarlyChildhoodCenterEngineering,andInfiltrationFeasibilityReportRenron,WashingtonPreilminap’DesignRecommendationsrequired.Softoryieldingareasshouldbeoverexcavatedtoprovideasuitablesubgradeandbackfilledwithstructuralfill.Thepavementsectionsincludedinthisreportsectionarefordrivewayandparkingareason-site,andarenotapplicabletoright-of-wayimprovements.Atthistime,wearenotawareofanyplannedright-of-wayimprovements,however,ifanynewpavingofpublicstreetsisrequired,weshouldbeallowedtooffersituation-specificrecommendations.Theexposedgroundshouldberecompactedto95percentofASTM:D1557.Ifrequired,structuralfillmaythenbeplacedtoachievedesiredsubbasegrades.Uponcompletionoftherecompactionandstructuralfill,apavementsectionconsistingof2’/tinchesofasphalticconcretepavement(ACP)underlainby4inchesof1¼-inchcrushedsurfacingbasecourseistherecommendedminimuminareasofplannedpassengercardrivingandparking.Inheavytrafficareas,aminimumpavementsectionconsistingof3inchesofACPunderlainby2inchesof5/s-inchcrushedsurfacingtopcourseand4inchesof1¼-inchcrushedsurfacingbasecourseisrecommended,Thecrushedrockcoursesmustbecompactedto95percentofthemaximumdensity,asdeterminedbyASTM:D1557.AllpavingmaterialsshouldmeetgradationcriteriacontainedinthecurrentWashingtonStateDepartmentofTransportation(WSDOT)StandardSpecifications.Dependingonconstructionstaginganddesiredperformance,thecrushedbasecoursematerialmaybesubstitutedwithasphalttreatedbase(ATE)beneaththefinalasphaltsurfacing.ThesubstitutionofATEshouldbeasfollows:4inchesofcrushedrockcanbesubstitutedwith3inchesofATE,and6inchesofcrushedrockmaybesubstitutedwith4inchesofATE.ATEshouldbeplacedoveranativeorstructuralfillsubgradecompactedtoaminimumof95percentrelativedensity,andalh/2to2-inchthicknessofcrushedrocktoactasaworkingsurface.IfATEisusedforconstructionaccessandstagingareas,someruttinganddisturbanceoftheATBsurfaceshouldbeexpected.ThegeneralcontractorshouldremoveaffectedareasandreplacethemwithproperlycompactedATEpriortofinalsurfacing.15.0PROJECTDESIGNANDCONSTRUCTIONMONITORINGOurreportispreliminarysinceprojectplanshadnotbeendevelopedatthetimethisreportwaswritten.WerecommendthatAESIperformageotechnicalreviewoftheplanspriortofinaldesigncompletion.Inthisway,wecanconfirmthatourearthworkandfoundationrecommendationshavebeenproperlyinterpretedandimplementedinthedesign.November18,2010ASSOCIATEDEARTHSCiENcES,INC.UP/Glib-KE!X287A2.Projects201002871KEIWPPage20 ProposedEarlychildhoodcenterRenron,WashingtonSubsurfaceExploration,PreliminaryGeotechnicalEngineering,andInfiltrationFeasibiliiyReportPreliminazyDesignRecommendationsWearealsoavailabletoprovidegeotechnicalengineeringandmonitoringservicesduringconstruction.Theintegrityofthefoundationsystemdependsonpropersitepreparationandconstructionprocedures.Inaddition,engineeringdecisionsmayhavetobemadeinthefieldintheeventthatvariationsinsubsurfaceconditionsbecomeapparent.Constructionmonitoringservicesarenotpartofthiscurrentscopeofwork.Iftheseservicesaredesired,pleaseletusknow,andwewillprepareacostproposal.Wehaveenjoyedworkingwithyouonthisstudyandarewillaidinthesuccessfulcompletionofyourproject.requirefurtherassistance,pleasedonothesitatetocall.confidentthattheserecommendationsIfyoushouldhaveanyquestionsorISincerely,ASSOCIATEDEARTHSCIENCES,INC.IGridand,WashingtonEruceW.Guenzler,L.E.G.ProjectGeologistAttachments:Figure1:Figure2:Appendix:VicinityMapSiteandExplorationPlanExplorationLogsLaboratoryTestingResultsNovember18,2010ASSOCIATEDEARTHSCIENCES,INC.Page21IIIIIIIIIIKurtD.Merriman,P.E.PrincipalEngineerEIVGnbKE100287A3-Projec:s2O1OO287IKElWP ——--———————————————— ‘In’loOn?Vicinycd, m‘Im mz0m C0 C0 -I0-a0 -aa —1--’an --:Pk 100287 Early ChiIdh km m mr -rz(nc-c cz -a 0Fap om >0 - -:-:i.:i7”:I:çE LZ ______ 4.‘*-r -— __ ! __________ a ..:f ‘1N:a ___ Jr [4 ‘!‘--a,t b ri tijit; ________________ h;4E3n%v_tIiftUth r ‘*LS(½.$4 - _7 a.—-£ : zt hc)—& V —a t4)-t 0 s - K._.ci(--8 r C 6 a n()J zjtiS?r*j I t-erire-t I1th * .,Y3> :4Th/--’1--; rHUi-JCD00CDwUzwUIUUIz-JIzz1Z0)—00aozxrUJcZcwFU)VInVVCt-zt..IU-J0C00zCN04I—w—D0z0a44IILrIIIrL[IFrrseraa_n-JPoJIdx]puQUSLflOOJOIUODPOOLIPIIYD14J03Z9OO APPENIMX CCUECCOWWell-gradedgravelandgravelwithsand,littletonolinesOPPoorly-gradedgravelandgravelwithsand,TermsDescribingRelativeDensityandConsistencylittletonolinesCoarseGrainedSoilsC)4a0UC0U,I,=a)02a)>I,(3‘I’GMDensityVeryLooseLooseMediumDenseDenseVeryOerseSiltygravelaidsiltygravelwithsandDCa)>a)U,0aCzC0ta)CC0-V0U,CC=a)020C01‘Oa)CaU0a0USPTt21blows/foototo44tO10lOto3030to50>50SPT12%tows!foototo221044toBalois15to3D>3DClayeygravelandclayeygavelwithsandConsistencyVerySoilFine-SoilDrainedSoilsMediumSliHStillVery51:11HardC0taU.TestSymbolsS=GrainSteM=MostueContentA=AtterbergLimitsC=ChemtaiDD=DryDensityK=PermeabilitySWWell-gradedsandandsandwithgravel,littletonofines000a)ananIt0-Poorly-gradedsandSPandsandwithgravel,littletonofinesa)at0U0002001an-DCC(0fSillysandandjSMsillysandwithJ-gravel4ana)CDescriptiveTermBouldersCobblesGravelCoarseGravelFineGravelSandCoarseSandMediumSandFineSandSiltandClayComponentDefinitionsSizeRangeandSieveNumberLargerthan12’3”to12’3!loNo.4(4.75mm)3”to3/4’3/4’toNo.4(4.75mm)No.4(4,75mm)toNo.200(0.075mm)No.4(4.75mm)toNo.10(200mm)No.10(2.00mm)toNo.40(0.425mm)No.40(0.425mm)toNo.200(0.075mm)SmallerthanNo.200(0.07Smm)ScClayeysandandclayeysandwithgravelMLSilt,sadysiigravellysilt,siltwithsandorgraveIIIIIIIIIIIIICU,CI,,>‘noI,=Ut0’-J(3)EstimatedPercentagePercentaoebyComponentWeiahtTrace<5FewSlobLklle15to25Wilh-Non-primarycoarseconstituents:>15%-Finescontentbetweer.5%and15%C:ayoflowtomediumctplasticity:silty,sandy.orgravetyclay,leanclayOLa)>a)U,00Cz0a)00‘aaa)C20CU,00U)Va)C0(9a)CMoistureContentDry-Absenceofmoisture,custy.dytothetouchSlightlyMoist-PerceptiotemcistjreMoist-DampbutnovisibewalerveryMoist-WatersiblebutnotfreecrainingWet-V:sibletreewater.usuatyIronDelowwatertableOrganicclayorsilloflowplasticityMHElasticsilt,clayeysilt,siltwithmicaceousordialomaceousfinesandorsilla)CnoU,C=a5IBlows/6”orportionof6”II,SymbolsSamplerTypeDescriptIonSamplerType2.0”CDSplit-SpoonSampler(SP1)BulksampleGrabSample7—Clayolhighplasticity,çjsandyorgraveWyclay,fatjf;IOH(4)(4)Drganicclayorsillofmediumtohighplasticity3.0’CDSplit-SpoonSampler3.25”CDSplit-SpoonRingSampler3.0”CDThin-WallTubeSampler(includingShelbytube)PortionnotrecoverediiUCemenlgroulsurfacesealBentoniteseatFillerpackwilhblankcasingsectionScreenedcasingorHydrotipwithfillerpeckEndcapPeal,muckandotherpyhighlyorganicspits‘Percentagebydryweight2)(SRi)StandardPenetrationTest(ASTM0-1566)131InGeneralAccordancev4thStandardPracticeforDescriptionandIdentificationotSoils(ASThID-2458)a)0SD01—SSoj0CC(4)DepthofgroundwalerIAD=timeofdriflingVStaticwaterlevel(date)CombinedUSCSsynibolsusedfortinesbetween5%and15%classlfilior.sofsoilsInthisreportarebasedonvisualfieldand’orlaboratoryobservations,whichincludedensity/consistency,moisturecondlUon.grainste.andplasticItyestimatesandshouldnotbeconstruedtcimplyfieldorbborabqtestingunlesspresentedhereir..Visu&-manuaiand.’orlaboratoryciasstflUoninetnodsofASThI0-2387and0-2486wereusedasarlder,tificafonguidefortheUn4fiedSotCasstricauonSysten.AssociatedEarthSciences,Inc.EXPLORATIONLOGKEYFIGUREAl Grassanctoesoil.LodgementTillHanddug1o2112feet.isinchesrecover-v.Dense.verymoist,mottied,grayandbrown,flnetocoarseSAND,litUesilt,lirtlefinegrave!(SW-SM),NostratificationorstructureiSinchesrecovery.Becomesmediumdense,mottledbrownSubtlegradationalstratificationWeakseepagezone(perched)18inchesrecovery.Verydense,moisttowet(vales),gray.finetocoarseSAND,fewsi3,irterbeddedwithbrown,fireSAND,withsilt(SFwiinSM)Weaseepaoeabovebrowr,finesand18inchesrecovery.Verydense,moist,gray,finetomediumSAND,tracetofewsilt(SP).AssociatedEarthSciences,Inc.IGeologic&MonitoringWellConstructionLogLc.lWeNumberSheProjectNameEarlyChildhoodCenterLotat.onRenton.WAElevaor,(opolWellCasing)N/ASurlaceElevation(It)WaterLevelElevationDateStart/Finish11111/inii/ii/lflDrilling/EquipmentBoretec/TrackHoleDiameter(in)7inchesHammerWeight/Dropi40#/3D’-C—FoHWELLCONSTRUCTION°007DESCRIPTIONIFlushmonumentConcrete2tc0feelBentonitechips47to2feet11/4-inchPVCblanktosurfaceVt-‘-A5ID—15-20-25-3035AdvanceOutwash16inchesrecovery.Verydense,verymoist,brown,finetocoarseSAND,littletowithsilt,littlefinegravel(SM).16inchesrecover.Verydense.moistcrown/sbgray,fireSAND.jewsill.Subtlegradatior,alstratification(SF)18inchesrecovery.Gradeswithracefinegrave!.-r1012—8I1218T2033—30I20I32.1135•t29I32450283543I2829V20Cz0aaAsabove.a8SamplerType(ST):2”ODSplitSpoonSampler(SPT)3”CDSplitSpoonSampler(D&M)GrabSampleflNoRecoveryM-MoistureLoggedby:BWG[RingSampleWaterLevel()Approvedby:0ShelbyTubeSampleWaterLevelattimeoldrilling(ATD) AssociatedEarthSciences,Inc.Geologic&MonitoringWellConstructionLog-ProjectNumberWellNumberSheet.:KE100287AEB-12of2ProjectNameEarlyChildhoodCenterLocationRentonWAElevation(TopatWe:tCasing)N/ASurfaceEtevatian(ft)WaterLevelElevationDateStawFinisn11/11/1011/11/10DrilinoJEuipmentBorelecifrackHoleDiameter(in)7inchesRammerWeignvDroo1404/30”a,0—.giWELLCONSTRUCTIONwDESCRIPTIONIIIIIII34‘8inchesrezovery.Tracetinegravelconcentratedinzo9e51-incb-thick.45-12818inchesrecovery.Tracegravelbecomesmereevenlydistributed.38Colorado#10-2060to47feet—50•-24Iinchesrecovery.Gmieswithoutgravel.11/2-inchPVCscreen0020-inchslot60to50feet—f18inchesrecoveryasabove.60——12818inchesrecovery.Gradationasabove.WellTag#BBB965I32£_______________________-Boringterminatedat611/2feeton11/11/10L65-7075SamplerType(57):1112”CDSplitSpoonSampler(SPT)flNoRecoveryM-MoistureLoggedby:BWG3”CDSplitSpoonSampler(D&FM[RingSampleWaterLevel()Approvedby:GrabSampleShelbyTubeSampleIWaterLevelattimeofdrilling(ATD) 0Ia4,0I0,C000‘IwAssociatedEarthSciences,Inc.IExplorationLogProjectNumberjExplorationNumberjSheetWKE100287AEB-2ProjectNameEarlyChUdhoodCenterGroundSurfaceElevation((I)N/ALocationRenton,WADatumN/ADriller/EquipmentBoreteclTrackDateStart/Finish11/11/1Al1/1111flHammerWeight/Drop1404/30HoleDiameter(in)7nrhsscinenaE—m-JBlows/FootSE5,4)C(500oT,o”SDESCRIPTION19203040Grassandtopsoil.LodgementTillHanddugto2feet.ISinchesrecovery:De’.se,moist,mottled,gray,lineocoarseSAND.withsill,Nilefinegravel(SM).Nostratircatbr.Bottomofexp!omiionbor.noat112fee:18inchesrecovery:GradatonasaboveIDinchesecovery.BecomingorayandlessmottledAdvanceOutwash18inchesrecovery:Dense,moist,browiishgray,fineSAND,littlefinegravelandsilt(SM,).Gracat/onalstratificat,cn16inchesrecovery:Verydense,moist,gray,fineSAND:fewaft(SP)NostratificationA34£313171713222716350/f13iS0-10—152025-30-354950/’‘.5575-3•1S-sSamplerType(ST):W2’CDSplitSpoonSampler(SPT)ED3”CDSplitSpoonSampler(D&M)GrabSampleLINoRecoveryM-MoistureRingSampleVWaterLevel()ShelbyTubeSampleIWaterLevelattimeofdrilling(ATD)Loggedby:BWGApprovedby: AssociatedEarthSciences,Inc.ExplorationLogProjectNumberIExplorationNumberISheetLI1W1!iiJKE100287AEB-3ProjectNameEarlyChildhoodCenterGroundSurfaceElevation(H)N/ALocationRen’ton.WADatumN/ADriller/EquipmentBoretecrrrackDateStart/FinishII/l1/1011/11/10HammerWeighVDrop140#/30”HoleDiameter(in)7irrhpg—ILE=Eealte-‘2Blows/Foo’I0a--n‘a°1’S°IC,asis>02—;Ct0£;DESCRIPTION010293040SamplerType(ST):—--W2”CDSpUtSpoonSampler(SPT)NoRecoveryM-MoistureLoggedby:BWG3”CDSplitSpoonSampler(D&M)RingSampleVWaterLevel0Approvedby:GrabSampleShelbyTubeSampleTWaterLevelattimeofdrilling(ATD)j7JIII2inchesaspnatpavingLodgementTill18inchesrecovers’.Ve’ydensemcist,mottled,gray.finetocoarseSAND,littlefinegrave’(SM).Nostratificat:on,s218inchesrecovery.Gradationasabove.Becomingbrown.16inchesrecovery.Verydense,moist,gray,finetomediumSAND,few5-3finegravel,tracesilt(SP).Nostratification,(Weakseepagezone)Verydense,verymoisttowet,brown,fineSAND,withsilt(SM)NoS-4stratificatinnVerydense,moist,gray,IThetomediumSAND,tracesiltandfinegravel65(SP).Nostratification,510152025243536172730i42638I?2727172427‘72‘57‘64.5451IIIIIIIIIIIIIBottomofexplorationboringat211/2feet0“II0Cz0-CDC0020C0CD AssociatedEarthSciences,inc.ExplorationLogEl.- .,JProjectNumberExpiDraLonNumberSheetKEIGO2B7AEB-41ofaOUDGroundSurfaceElevation(It)N/ADatumN/ABoretec/TrackDateStart/Finish11/11/10,11/11/in140#/30”HoleDiameter(in)7nrhpc18inchesrecovery,Verydense,moist,brown,finetocoarseSAND,withsill,littlefinetocoarsegravel(SM)Nostratification,DESCR1PTIONLodgementTill2inchesrecovery.BlowcountoverstatedGradationasabovebasedonrecoveryandcuttings.18inchesrecoveryGradestowithfinetocoarsegravel(SM).AdvanceOutwash18inchesrecovery.To21feetgradationasabove.Below21feetdense,moist,gray,finetomediumSAND,tracesilt(SP).Boltcmofexplorationboringat211/2feetProjectNameLocationDriller/EquipmentHammerWeight/DropEarlyChildhoodCenterRenton,WA=C,0,0,a2LIDS11/2inchesasphaltpaving.10203040885-1S-2S-3S-4S5501118inchesrecovery.Verydense,moist,brown,lineSAND,fewsilt,tracelinegravel(SP).Gradationalstrat;rication.primalyofgravelfractionI—5i—1530-ia‘72A,7CICCz.0-CBI00SamplerTypeST):W2”ODSplitSpoonSampler(SPT)W3”00SplitSpoonSamplerCD&M)GrabSampeNoRecoveryRIngSampleMMoistureWaterLevel(\Loggedby:BWGApprovedby:ShelbyTubeSample1WalerLevelattmeodrilting(MD) 0CciC4,20-CD4,0Renton,WADatumN/ABoretecifrackDateStart!Finish1/11/1011/1i/in140#/30’HoleDiameter(in)7innhp14inchesrecovery.Verydense,moist,mottled,brown!finetocoarseSAND,withsiltandOnetocoarsegravel(SM).Nostratif.cation,SamprTypeT):—-W2”CDSplitSpoonSampler(SPT)UNoRecoveryM-MoistureLoggedby:SWGinoLu300SplitSpoonSampler(D&M)RingSampleWaterLeveloApprovedby:0—aNyi_jGrabSampleShelbyTubeSampleYWaterLevelattimeofdrilling(ATD)LocationDriller/EquipmentHammerWeighVDropAssociatedEarthSciences,Inc.ExplorationLogE...ProjectNumberExplorationNumberSheetKE1002B7AEB-5lollProjectNameEarlVChildhoodCenterGroundSurfaceElevation(It)N/ADESCRIPTIONC0ex—I0pLodgementTill0Blows/Foot1023300CDa,a,018inchesrecover].Gradationasahove.IIIIIIIItOAdvanceOutwash-Grassandto;soil.3-2S-36-46518inchesrecovery.Asabove.Bottomolexplorationboring8121t2(eel18inchesrecoveryVerydense,moist,brown,fineSAND,fewsilt(SP).Significantgradationalstratification.15‘I2933163042152629IS212516232918inchesrecovery.Gradationasabove,butwithoutstratification.20‘62‘72‘5552*42530-35 AssociatedEarthSciences,Inc.IExplorationLogProjectNumberIExplorationNumberSheetLLii‘KE100287AEB-S1of1ProjectNameEarlyChildhoodCenterGroundSurfaceElevation(ft)N/ALocatiorRenton.WADatumN/AD’)er/EquiprnentBoretecrrrpckDateStart/Finish11/11‘In11111/InHammerWeignbtroz140#/3Q•Hz!eDiameter(in)7inchpg—c052n‘ =°-E—e-sows/FootaI.SEB,EaO0T00’DESCRIPTION10203040———.————I‘30S-iS25-35-4s-SGrassandtopsoil.____ __ ___ __ ___ _—LodgementTill18inchesrecoveryDense,moist,mottled,brown,finetocoarseSAND,withsilt,littlefinetocoarsegravel(SM).Nostratification.15inchesrecovery.Graal:onasabove.AdvanceOutwash18inchesrecovery.Dense,verymoist,brown,fineSAND,fewsilt-siltstringer11to11.2feet(SPwithML).18inchesrecoveryBecomesverydense-Gradeswithtracefinegravel.Significantstratification(SP).16inchesrecovery,Gradationasabove,butminimatstatificatiàntSP).A42A431313211211142419224047‘524301015207-253035‘87So:tomofexoioraonb&ir.ga:211/2feWIIa 0000U,LUSamplerType(ST):Dl2’00SplitSpoonSampler(SPT)W300SplitSpoonSampler(0&M)GrabSampleNoRecoveryRingSampleM-MoistureWaterLevelt)ShelbyTubeSampleTWaterLevelattimeofdrillingtATD)Loggedby:BWGApprovedby: 18inchesrecovery.Dense,moist,brown,fineSAND,fewsilt,tracetinegravel(SP).Gradationalstratification.AssociatedEarthSciences,Inc.IExplorationLogProjectNumberExplorationNumberISheetLWäEIKE100287AEB-7lollProjectNameEarlyChildhoodCenterGroundSurfaceElevation(it)N/ALocationRentonWADatumN/ADriller/EquipmentBoretecltrackDateStart/Finish11/Il/ID11/11/10HammerWeiohbtropi40#/30’HoleDiameter(in)7inrhAc2—IC‘i,j,—-.°-‘°-EFe-.Blows/Footassl,..ol‘Io0T‘DESCRIPTION010203340-Grassandtopsoil.Fill14inchesrecovery.Loose,verymoist,brown,fineSAND,withsilt,fewfinegravel(SM).6inchesrecovery.Gradationasabove.AdvanceOutwash5inchesrecovery.DisturbedcuttingsresembleS-3.Norecovery.IIIIIIIIIIIIIIIIIDense,moist,gray!fineSAND,fewsilt(SP).Nostratification.A1.435-2Ag5910jS-314‘30is1571023“5330etTs5-ii£34171914A3I-——,..—___________———________—————-21—25Bottomofexplorationboringat24feet-3035SampterType(ST):—————————W2”CDSplitSpoonSampler(SP1]flNoRecoveryM-MoistureLoggedby:BWGED3”CDSplitSpoonSampler(0&M)IIRingSample£WaterLevel0Approvedby:GrabSampleShelbyTubeSampleIWaterLevelattimeofdrilling(ATD)CCECzC40CtnLU4 GRAINSIZEANALYSIS-MECHANICALDateProjectProjectNo.SoilDescription11/15/2010EarlyChildhoodCenterKE100287ATestedByLocationEB/EPNoDepthSandfewsilttracegravelMSOnsiteEB-15-520’Wt.ofmoisturewetsample+Ta284.12TotalSampleTare39502Wt.ofmois:ureGrySample+Tare268.47TotalSamplewi+tare78045WI.ofTare95.38TolalSampleWt3854Wt.ofmoistureDrySample169.09TotalSampleDryWt3528Moisture%9%SpecificationRequirementsSieveNo.Diam.(mm)Wt.Retained(q)%Retained%PassingMinimumMaximum3.590-100.00376.1-100.002.564-100.00250.8-100001.538.1-100.00125.4-100.003/419-100.003/89.512.120.6099.4D#44.766.861.9498.06#813816.54,6895.32#10220.985.9594.05#200.8560.7517.2282,78#400.42170.1248.2351.77#600.25252.4471,5628.44#1000.149288.98I81.9218.08#2000.0743035186.033.97USSTANDARDSIEVENOS.r:cND4kO‘cND33sc200103.i..I£I.I60.J:,,H.,t::i,C).560.‘‘IC -,C)..I• ‘• .240‘I’‘Hit;.20r.”’’.‘‘‘.;i:H’:Ii.tif.ti.,.i;•Li,.,,.-IOU1010100GrainSize,mm,,‘i,ASSOCIATEDEARTHSCIENCES,INC.Dli5thAve,Suite100Kirkiend,WA98033425-827.7701FAX425.827.5424 GRAINSIZEANALYSIS-MECHANICALIDateProjectProjectNo.‘SoilDescription1ill512010EarlyChildhoodCenterKE100287ATestedByLocationEB/EPNoDepthSandfewsilttracegravelMSOnsiteEB-45-4Wtofmoisturewetsample+Ta350.84TolalSampleTare51865WI.ofmoisturedrySample+Tare-328.44ITotalSamplewt+tare99907WI.ofTare97.74TotalSampleWI4604WI.ofmoistureD.Sample230.7TotalSampleDryWI437.9Moisture%10%SpecificationRequirementsSieveNo.Diam.(mm)Wt.Retained(q)%RetainedO/PassingMinimumMaximum3.590-100.00376.1-100.002.564-100.00250.8-100.001.538.1-103.00125.4-100.003/419100.003189.515.051.1598,85#44.7615.683.5898.42#82.3831.97.2892.72#10238.068.6991.31#200.6579.7318.2181.79#400.42185.2542.3057.70#600.25304.3569.5030.50#1000.149357.6281.6716.33#2000.074378.1886.3613.64USSTANDARDSIEVENOS.33/”N04NO16N040NO20010060:’;i’.r;,,‘i.,.:L;;i;•IS60H.I‘3H!ic.::..I20.;:;;01001010.1001GrainSize,mmASSOCIATEDEARTHSCIENCES,INC.IIII1IIIIIIII9115thAve,5tetOOKirkland,WA96033425-627-770?FAX425-627-5424 AssociatedEarthSciences,Inc.ti ______eimthyOver25rsofSenneAugust17,2011ProjectNo.KE100287ARentonSchoolDistrictdoGreeneGasaway,PLLCP.O.Box4158FederalWay,Washington98063Attention:Mr.CalvinGasawaySubject:SummaryofAdditionalBoringstoDelineateExistingFillEarlyChildhoodLearningCenter1800IndexAvenueNERenton,WashingtonDearMr.Gasaway:Thislettersummarizessupplementaryexplorationboringstodelineateexistingfillonthenortheastportionofthesite.Thisworkissupplementarytoourearlierworkon-site,whichhasincludedcompletionofsubsurfaceexplorationsandpreparationofageotechnicalengineeringreportdatedNovember18,2010.Thislettershouldbeconsideredsupplementarytoourearliergeotechnicalengineeringreport.BACKGROUNDOurearliersubsurfaceexplorationprogramon-siteidentifiedsubsurfaceconditionsgenerallycharacterizedbylodgementtillthatwastypicallyontheorderof8to14feetthick,underlainbyadvanceoutwashsedimentsthatwouldbeusedasthestormwaterreceptor.Oneboring,EB-7,identifiedexistingfilltoadepthofapproximately7feetabovethenativesedimentsonthenortheastpartofthesite.Reviewofavailablehistoricinformationshowedthatthenortheastportionofthesitehadpreviouslybeenoccupiedbyhousesthatweredemolished.WespeculatedthatexistingfillobservedatEB-7mayhavebeenrelatedtotheprevioushousesinthisarea.WeproposedtocompleteadditionalsubsurfaceexplorationsinthevicinityofEB-7tofurtherexplorethelimitsoftheexistingfill.Thisreportsummarizestheresultsofthoseadditionalexplorationborings.ADDITIONALSUBSURFACEEXPLORATIONSWecompletedatotalofeightadditionalsubsurfaceexplorationborings.Attachedwiththisletterarea“VicinityMap,”Figure1,showingthesitelocation;a“SiteandExplorationPlan,”Figure2,whichdepictsalloftheexplorationscompletedon-sitetodate;and“EnlargedSiteandKirklandEverettTacoma423-S27-7701423-939-0S2?.733-727-7.997 EarlyChildhoodLeandngCenterIRenion,WashingtonSuminaiyofAddItionalBoringstoDelineateExistingFillExplorationPlan,”Figure3,whichdepictsexplorationsinthevicinityofEB-7atalargerscale.Figure3alsodisplaysthedepthofobservedexistingfillateachexplorationboringlocation.Ingeneral,theadditionalexplorationboringsidentifiedanareaofexistingfillthatextendsnorthandsouthofEB-7.Theexistingfillappearstoextendbeyondthelimitsofthepreviouslyexistinghousesinthisarea,andthereforemaynotbedirectlyrelatedtothepreviousresidentialdevelopment.Ingeneral,theexistingfillisofsimilargradationandappearanceasthenativesitesoils,butislooser.Ourexplorationboringsdidnotencountersubstantialquantitiesofdeleteriousmaterialssuchasorganicmaterialordemolitionwasteintheexistingfill.Detaileddescriptionsoftheconditionsobservedineachexplorationboringareincludedontheinterpretivesubsurfaceexplorationlogsincludedwiththisletter.CONCLUSIONSANDRECOMMENDATIONSWedonotrecommendthatnewfoundationsbeconstructedaboveexistingfill.Werecommendthatbelowfoundationelementstheexistingfillberemoved,andtheplannedfoundationgraderestored,asneeded,withstructuralfillasdefinedinourearliergeotechnicalengineeringreport.Newfoundationscanthenbeconstructedwithanallowablefoundationsoilbearingpressureof3,000poundspersquarefoot(psf)abovethenewstructuralfill.Ifdesired,slab-on-gradefloorsmaybeunderlainbyexistingfillcappedwith2feetofnewstructuralfill.Ifthisapproachisselected,werecommendthattheexistingfillbeexcavatedasneededtoallowplacementofatleast2feetofnewstructuralfillbelowtheplannedfloorandcapillarybreakmaterials.Theresultingsurfaceshouldbeproof-rolledandcompactedto95%ofthemodifiedProctormaximumdrydensity.Anysoft,yielding,organic,orotherwiseunsuitablesoilsshouldreceiveadditionalpreparationasdictatedbyfieldconditionsatthetimeofconstruction.Followingsubgradepreparation,2feetofnewstructuralfillshouldbeplaced.Thisapproachwillresultinfloorslabsconstructedaboveexistingfill.Thisapproachwillresultincostsavingsascomparedtoremovingalloftheexistingfillaspreviouslydescribedforareasbelownewfoundations,andwillalsoresultinriskofsomeadditionalfloorslabsettlementifundetectedunsuitablefillremainsbelowthefloors.Thisriskisdifficulttoquantify,andsettlementoffloorslabsinthefinishedbuildingcouldbechallengingtorepair.Iftherisksoflargerthannormalfloorslabsettlementarenotacceptable,allexistingfillshouldberemovedfrombelowfloorslabs.Belowpaving,werecommendcompletingstrippingandexcavationtopavingsubgradeelevation.Theresultingsurfaceshouldbeproof-rolledandcompactedto95%ofthemodifiedProctormaximumdrydensity.Anysoft,yielding,ororganicareasshouldreceiveadditionalpreparation,asdictatedbyfieldconditionsatthetimeofconstruction.Thepavingsectionsrecommendedinourcomprehensivegeotechnicalengineeringreportcanthenbeconstructedasplanned.Thisapproachwillresultinconsiderablecostsavingsascomparedtoremovingalloftheexistingfillbelowpaving,butwillresultinsomewhathigherrisksofpavingsettlement.Pavingareasaregenerallyeasierandlessexpensivetorepairthanpreviouslydescribedforfloorslabs.IftheAugust17,2011ASSOciATEDEARTHSCIENcES,INC.KDM/th-KE10023745-ProJecn2OJOO287IKEiWPPage2 EarlChildhoodLearningCenterReman,WashingtonSzunn;a;yofAdditionalBoringstoDelineateExistingFillpotentialforlargerthannormaltotalanddifferentialsettlementofpavingareasisunacceptable,allexistingfillshouldberemovedfrombelowplannedpaving.Belowgradesensitiveburiedutilities,suchasgravitydrains,werecommendthatatleast1footoftheexistingfillberemoved.Thesubgradeshouldbeproof-rolledandcompactedto95%ofthemodifiedProctormaximumdrydensity.Anysoft,yielding,ororganicareasshouldreceiveadditionalpreparationasdictatedbyfieldconditionsatthetimeofconstruction.Onefootofnewstrucwralfillshouldbeplacedtoreachplannedgradeforpipebeddingmaterials.Thisapproachwillresultinsomeadditionalriskofsettlementascomparedtoremovalofalloftheexistingfill.Itmaybeappropriatetoincreasedrainagegradientsofutilitiesconstructedaboveexistingfillssuchthatsomesettlementcanbetoleratedwhilestillmaintainingplannedflowdirectionsandpositivegradientsinthepipes.CLOSUREWeappreciatetheopportunitytosubmitthisproposalandhopethatitmeetsyourneeds.Ifyouhaveanyquestions,pleasedonothesitatetocall.Sincerely,ASSOCIATEDEARTHSC[ENCES,INC.Kirkland,WashingtonKurtD.Merriman,P.E.PrincipalEngineerAttachments:Figure1-VicinityMapFigure2-SiteandExplorationPlanFigure3—EnlargedSiteandExplorationPlanSubsurfaceExplorationLogsAugust17,2011ASSOCIATEDEARTHSCIENCES,INC.KDM/th-KE10028745-ProJecisI2OIOO287lKEHi’PPage3 100281E2r1yCfrldhoodCentiI100287Vizny7-11.cdrm-nm:0mz001C0,00,—10-u0U,U,0nCD04rnnCDznCDU,I,0z—1>-UmmrcooxO2000ozZFjr:LL,a1!crr1rra___ietataiLflJt’1I---it_riwi________S____AJ___p___!cc:%..a>zjq11p114-:fr;iI_—1.1C‘1CCCA11omCILa”or7.—IfSZ-a————a—a—a—a—aaaaa U,toCn(tC)Cl-,nnCo—C-,CmIiiCto1mmz00aa0rmxI100287EarChh:oCenter167Sr.eendEpIr7-11cc,H3’>zEX-r<03’CoIozZr>z20a0Wi: 11(X)287EaIWChildhoodCome,‘1CWB7SiteandExpirLGairImmm20m0CC0rPh(4,(4,anI—(0rnntoI.,(0-4nL’H—F”I//5—//.om.3//rmu—dmr>c•°QthiiCrzoa?a(7N.qm01N\t.3.6NI•040/7.fle•mcam.aim-kmzr>0rnmr—z-<Hrz2°-U02zU0z-Urz-DCC2pmC(.1\0N--0/N3nN//,‘/I--—--———lNN’/2.7,<$i.//0mInm000////•/////*)//4N PushmonumentCcncrele2tonleerGassandtopsoiLLodgementThuHanddug1o2112feel8ncesrecovery.Dense,verymcst.molled,grayanthron.f:cetcoarseSAND,il:!esIrjutefineoave(SW-SM)Nos:-alificalonorstructure6inchesrc-caven.Becomesmedium,dense.mcltledo’ow’Suh:legradationalstrauticauncAdvanceOutwash8inchesrecoveryVerydense,verymoist,brown,fine(0coarseSAND.littletowithsilt.littlefinegravel(SM)16inchesrecoveryVerydense,moist,brownishgray,fineSAND,fewsiftSubtlegradationalstratification(SF)Weakseepagezone(perched)18incnesrecoveryVerydense,mcsIlower(vales),gray,finetocoarseSAND.few-srI,interbeccecwhobrown.FineSARD.w.iflsib(SPwilhSM).Weakseepaaeaoovecronn.linesar,c16inchesrecoveryVerydense,moist,gray,finetomediumSAND,tracetofewsilt(SP).Assu±tedEnithScienccsInctGeologic&MonitoringWellConstructionLogJ][E—..[ProjectNumberWellNumberSheet..IKE100287AES-i1o12PrnieclNameEarlyChildhoodCenterLocationRenton,WAElevation(TopnlWellCasing)N/ASurfaceElevation(II)WalerLevelElevatinriDateStart/Finish1/I1/1011/11/10Driliing/EriiiicinientBorefec/Track—_______________ __HoleDiameter(in)7inchesi-IoiT,mcriAieiglul/Dropi40U/3D_l--a.=—.a.in°.c-:iWELLCONSTRUCTrONSCu’DESCRIPTiONSertno;techips47to2eer14-inchPVCblanktosurfaceIIILIII.20II,30to2‘aa1to3330203238353$29Is225028Jo4.31V6inchesrecoveryGradeswithtracelinegraveiAsabnveCSUSamplerType(51):2CDSplitSpoonSampier(SF1)CDSplitSpoonSampler(D&M)UII171NoRecoveryRingSampleM-MoistureLoggedby:6WGWaterLevel()Approvedby:HGrabSampleShelbyTubeSampleIWaterLeveiattimeofdrilling(ATD) AssodatedOarlhSciences,Inc.Geologic&MonitoringWellConstructionLogED—ProjectNumberWellNumberSheet-KE10028YAEB-12of2ProjectNameEarlyChildhoodCenterLocationPenlon,WAElcvationITopofWellCasing)N/ASurfaceElevation(II)WalerLevelElevalronDateStaruFinish11/11/1011/11/1Drilling/EquipmentBoretec/Track—______________HoleDiameter(in)7inches1-lammerWeigliuDropi404/30C—=—bHWELLCONSTRUCTION00DESCRIPTIONIII1IIIIIII15-50-55—60-65—700i-750(3U00I18inchesrecoveryTracetinegravelconcentratedrozones1-inch38thick452518inchesrecoveryTracegravelbecomesmoreevenlydistrihutedI35£Colorado#10-20601047feet2418inchesrecoveryGradeswithoutgravel11/4-inchpycscreen0020-inchslot60to50feel-12518inchesrecoveryasabove4150-2818inchesrecovery.GradationasaboveWellTagIISBB95532Boringterminatedat811/2feelon11/11/10SamplerType(ST):2CDSplitSpoonSampler(SPT)NoRecoveryMMoistureLoggedby:BWG3!ODSplitSpoonSampler(D&M)[RingSampleWaterLevel()Approvedby:GrabSample0ShelbyTubeSampleWaterLevelattimeofdrilling(ATD)— iiS-iH—915-2-10AssocioledEatlItSciences,Inc.ExplorationLog_LEJ3J- ,,.ProjenlNumberExplorationNumberSheet:c’,J1JLKEIDD2S7AEB-2lctlOru1ecINameEarlyChildhoodCenterGrouncSurfaceE:evaton(It)NIA..ocallcnRenton,WA—DatumDriBe;]Equioment-Boretec/TrackDaleSlaruFinish11/Il/lflIl/i1/1—iamniervveiauDrnp4O#/3D”Ho;eDiameter(inLjcp”°;—cigotBlows/FontESBoro&5DESCRIPTIONio203040Grassandtopsoil,LodgementTillHanddugIn2feetranchesrecoveryDense,moisl.mollied.gray,finetocoarseSAND.lilt:efloegravetiSM)Nosualircalizn10inchesrecoveryGradationasabove10inchesrecoveryBecominggrayandlessmoltiedAdvanceOulwash18ir-zfleSrecoveryDense,moist,brownishgray.flreSAND.liltefinegravelandsilt(SM)G’adalcialstraIica:ion18inchesrecoveryVerydense,moist,gray,fineSAND,fewsilt(SP)Noslralification41317113222715350?!13162082530lu‘50/!‘555-5A3Bolloiiioferploralonboringal211/2leer20—25-30350IICCC00aSarrpvTypeST):LU2”CDSplitSpoonSampler(SFT)UI3”00SplilSpoonSampler(0&M)GrabSamoLe[3NoRecoveryM-MoistureRingSample?WaterLevel()VShelbyTubeSampleYWaterLevelattimentdrilling(ATD)Loggedby:BWGApprovedby: 18inchesrecoveryVerydense,moist,mottled,gray,finetocoarseSAND.littlelinegravel(SM)NDstralilir.alion15inchesrecov€ryVerydense,moist,grayfiretomediumSAND.fewliee’avei.traces:tl(SP).Nostratificaior.Verydense,111015:.cray.finalemacurnSAND.tracesilancfinegrav&(SP)NosIralilicationBottomc’exptcra:ionboorso1211/2lee:RenlonWA140#/30’AssociniedEatlliSciences,inc.ExplorationLogFEiFri“][]-‘[7IProjectNumberExplorationNumberSheetLnLULU’UJLUKE1002B7AEB3—1ofIProjectNameEarlyChildhoodCenterGroundSurfaceElevahoniiN/ALocation--Datum___________________Driller/EquipmentBoretec/TrackDateStarVFinish___________________________HammerWeighuDropHoleDiameter(in)N/A2inchesasphaltpaving11/14/1011/1I/tOJjhpDESCRIPTIONSja0a0Uto000LodgementTill15inchesrecoveryGraca::o:iasabueBecomingbmw,.05.315S-4(Weakseepagezone)Verydense,verymoisttowet,brown,tineSAND,withsilt(SM)NosIretificaIion23I____________________________________________________IILBlows/FootF-1aCo10203040I24364f72361727,,5730.II2538II 1712727I724271IIII1SarnpterType(ST).IED2’00SplitSpoonSampler(SPT)flNoRecoveryM-MoistureLoggeciby:BWGED3”00SplitSpoonSampler(D&M)[RingSampleVWaterLeveloApprovedby:GrabSampleShelbyTubeSampleWaterLevelattimeofdrilling(ATO)I253035C‘30CIxCIx0a‘C PiojectIjaniaLocationDilloIIEquipfllenlI-IriiiineiWeijhlJDiopGroundSurfaceElevation(II)N/ADatumNIA‘I,0;n132030‘10IEarlyChildhoodCenterRantonWAAssocialedFaithSciences,ExplorationLogED.-_ProjectNumberExploralionNumberSheel_ _ _ _ _ _ _ ___________-KE100287AEB-41of1Boretec/Track——DateStarUFinish14_cL3OZ— - _ _ _ _ ___ _ _ _ _ _ _ _ ___ _HaleDiameter(in)=DESCRIPTION11/11/in11111/in1i2inchesasphal:pavir.gJjctrhpc—______LodgementTill:5,ncfiesiecove’yVeiydense,iroSl,brown,tines:f.tItlenetocoarseg-av&(SM)NostratificationtDcoarseSAND,withICq_IS22:r,chesrecoveryBowcoon:oveistalodGrar:al,onasabovehaserlonIe::’:erVandci;ItinrwS-aS-3S-s18inchesrecoveryGradestowithrinetocoarsegravel(SM)IAdvanceOutwash18inchesrecoveryVerydense,moist,brown,fineSAND,fewsilt,tracefinegravel(810)Gradationalstratification,primarilyofgravelfraction12L32724°20IItO18inchesrecoveryTo21feelgradationasaboveBelow21feetdense,moist,gray,finetomediumSAND!tracesilt(SP)BntiomDierptoralionboringat21112eel294040162225I-J..—SamplerType(ST)aCL0‘a00W2”CDSplitSpoonSampler(SPT)NoRecoveryLU3”CDSplitSpoonSampler(D&M)[RingSampleGrabSampleM-MoistureLoggedby:BWG2WalerLevelApprovedby:ElShelbyTubeSampleIWaterLevelattimeofdrilling(ATD) Assocn(edEarthSciences,inc.ExplorationLogEDflProjectNumberExplorationNumberSheet•••KE1002S7AEB-51of1ProjectName,EriyChildhoodCenterGroundSurfaceElevation(It)N/ALocetictitRenton,WA—_____________________________DatumN/A—DrilLerIEqu}pmentBorelec/TraclcDateStaruFinish11/11/1011/1ill0HammerWeighuorop140#/30”HoleDiameter(in)2jh—ci2S2ot’°Blows/Foot—‘aS9T0’°oaDESCRIPTION10203040III1IIIIIII1I1IIIII1-Grassandtopsoil.-LodgementTiltIitinchesrecoveryVerydense,moist,mottled,brown,linetocoarseiiISAND,withsiltandlinetocoarsegravel(SM).NostratiFication29—33I,IT8nchesrecoveryG:adatiooasafloveI72—AdvanceOutwash-.-H-:2nchosrecaveft-Verynerse,most,tunwn,tineSANO.fewsilt(SP)‘is•I-‘Scr.ifs.artgrcdat;or.a.stratificatio25554,-15‘8:nrhesrerove’G,acat:c,asabove,hutvtt’,outslratirication5-42125-2C8inchesrecaveryAsaboveR0’tS-:2352—I29ISo::cn,01ep’oraIonbnhiroat21•(2eel3035SamplerType(ST).W2”CDSplitSpoonSampler(SPT)[NoRecoveryM•MoistureLoggedby:S’NGED3”CDSplitSpoonSampler(0&IA)[RingSampleWalerLevelApprovedby:GrabSampleShelbyTubeSampleIWaterLevelattimeofdrilling(ATD)©0“I0C0-CIt0CC0Ca)e 11MI)1P1I’i)’fl_ZinrhAssorintedEnribSciences,Inc.ProjectNameEarlyChildhoodCenterLocationDr’iedEc1u:pmentHam’ieiWeigtiliDro1,RentonWAExplorationLoqBoretedTrack1404/30”ProjectNumberExplorationNuirnherSheelKE100287AE8-61cliGroundSurfaceElevationIll)N/ADatumDaleStaWnish-ceD:ameierin)DESCRIPTIONS-il=ci_JC,1r’&Bra5B;ows/Foot1?2030498-2.0F00toA325-3A4,Grassandlcsc.LodgementTill18inchesrecoveyDensernosl,mottled,ornwn.tinetocoa’seSAND.withsit.NIlefinetocoarsecrave!SMNosl-a:1cal—:8‘rcnesrecovery.Grana:Ecnasabovej2121AdvanceOutwash18Itchesrecovery.Dense,verymn}st,brown,hoeSAND,fewsill-sill14strinuer11Icii2reel(SPwithML)241918incitesrecoveryBecomesverydenseGradeswithtracetinegravel22Significantstratification(SP)404718inchesrecoveryGradationasabove,butminimalslrati(icalinn(SP)18243015S-42055Bctic:’’,Si01pinto’,boringa’2’-25075435C,Fl’SamplerType(ST)W2’ODSplit5poonSampler(SRI)DNoRecoveryM-MoistureW3”00SplitSpoonSampler(D&M)[RingSampleWalerLevel()IGrabSampleShelbyTubeSampleYWaterLevelatlimeofdrilling(AID)Loggedby:BWGApprovedby: AssociatedPatthSciences,Inc.ExplorationLogHHHProjectNumberExplorationNumberSheet-KE1002S7A[67——lofl7rolectkaneEarlyChilohoodCenterGroundSurfacealevaon(FE)N/A—LccaFcr,Renton,WADatumN/ADnte/EquipmentBoretec[rrackDaleSlarL’Ftnish11/11/1011/11hIL,,,,l-.onmerWeight’DropiLQ#I3D”hoeDiamete-fin)gLor,°,iSlows/FootSC-.T001aI—DESCRIPTIDN10203040AI.9GrassandtopsoilFill14inchesrecovery.Loose,verymoist,brown,tineSAND,withsill,Fewlineg’avel(SM)6nonesrecoveryGradationasaboveAdvanceOulwash18inchesrecovery.Dense,moist,brown,fineSAND,Fewsill,traceFinegravel(SP)Gradationalstratification5inches‘occvervDistirheici:ngsresemble6-3Norecovery.Dense,moist,gray,FineSAND,fewsilt(SP)NostratificationBottomofexploationboringat24eel‘3115‘0‘Ia914101023971791421Is’2I20S-B—2535HIII1IIIIIIIIIIIIIIix00U,USamp:erTyneST)2CDSplitSpoanSan’pr(SPT)NoReenvery‘A-MoistureLoggedby:BWG3•!CDSplitSpoonSampler(0&M)ElRingSampleVwaterLevelApprovedby:GrabSampleShelbyTubeSampleWalerLevelattimeofdrilling(ATD) AssctciitcdEarthSCiLTICCS,Inc.ExplorationLogiProjectNumberExplorationNumberSheetKE1002B7AES-BIof1ProjectNameEarlyChildhoodCenterGroundSurfaceElevationN/ALocattonRenton.WADatumN/ADriller/EquipmentBoreteciTrackDateStart/Finish7/24/117/24/11HammerWeight1Drop140#/30HoleDiameter(in)_ __ _ ___ ___ _ __ _ ___ ___ _ _C.otoGrassandtopsoil5inche&Handdug11/2feetMediumdense,verymoist,lightbrown,fineSAND,withsilt,littlefinegravel(SM).Verydense,moist,lightbrownwithmottling,finetomediumSAND,withsilt,titttefinetocoarsegravel(SM);nostratificationVerydense,moist,gray,finetocoarseSAND,withsilt,fewfinetocoarsegravel(SM),nostratificationBottomofexplorationboringat61/2feet00CoTDESCRIPTIONiJe0—J000LodgementTilt102030401014412041oftI5J5-210-15-20-25-3035SamerType(Sfl:—-ED2”ODSplitSpoonSampler(SPT)flNoRecoveryM-MoistureLaggedby:BWGED3”CDSplitSpoonSampler(D&M)IIRingSampleWaterLevelQApprovedby:GrabSampleShetbyTubeSampleWaterLevelatlimeofdrilling(ATD)I 1019IS193025.36.0/4’ProjectNameLocationRen)nnWADriller/EquipmentEarlyChildhoodCenterAs%nrl,ilcdLiithScieiicus,Inc.ExplorationLogD—-ProjectNumberExplorationNumberSheetLL.KEIOO2S7AEB-91of1HammerWeight/Drop140#/30’Boretec/TrackGroundSurfaceElevation(II)N/ADatumDateStaWFinishHoleDiameter(in)N/A3/74/11,7/74/11DESCRIPTIONC,C-sC,C.CCCU03C‘II,,-C,‘I0C10IIIIIIIIII15Blows/Foot10203040Grassardtcpsoil——,,jj---Lodgementtitt19Medumdense,moist,lightbrown,fineSAND.withsilt,fewfinegravel(SM);nostratification.Dense,moist.brown,finetomediumSAND.withsilt(SM)A49yen’dense,mc;s[,gray.finetocoarseSAND,witnsit,littlefinegravel(SM).nostratilcancnSamplesmearedwithmaterialtronabove.SC!--AdvanceOutwashCuttingsbecomegray,withlesssilt.Verydense,moist,gray,finetomediumSAND.fewtolitilesilt(varies),fewisfinegravel(SP-SW);gradationalstratification2453--—‘—‘—-----——29BottomofexplorationboringallI1/2reel-20-25-30-35SamplerType(ST):W2’CDSplitSpoonSampler(SPT)HNoRecoveryM-MoistureLoggedby:BWGUI3”ODSplitSpoonSampler(D&M)RingSamplegWaterLevel()Approvedby:GrabSampleShelbyTubeSampleZWaterLevelattimeofdrilling(ATD)CNza04C.0C00C,0000 AsucialL’tILiithSciciicc,tnt’.ExplorationLogr—nr—’iyr—n-“‘rr’c,Pro)eclNumberIExplorationNumberSheetLJ!JLCJiLKE1002B7AEB-lOlofiEarlyChildhoodCenterProjectNameLocationRenton,WADrillerlEquipmentBoretec/TrackHammerWeight/Drop140#/30”(DUD=000S.tCoGroundSurfaceEievat:on(H)N/Ahi/ADatumDateStart/Finish7/241117/24/lIHoleDiameter(in)___ _ __ _ __ _ __ ___ ___ _DESCRIPTION510203.3405,35.41019Grassandtopsoil.FillMediumdense,moist,lightbrown,fineSAND,littletowithsilt,tracecoarsesand/finegravel,traceorganic(topsoil)(SM)Loose,moist,l;ghtbrown.flneSAND,withsilt,fewfinecravellcoarsesar,d,raceorganic(topsoil)AdvanceOutwashDense,moist,brown,fineSAND.fewsilt,traceflnegravet/coarsesand(SP);nostratification.Becomesverymoist,withthin(1/4-inch)siltystringers(SP)15£12A1121213S-S20cttcrnolexp:oraticnboringat161/2feet253035SarnerType(Sfl:2”CDSplit5poo.nSampler(SPT)NoRecoveryM-MoistureLoggedby:BWGW3”CDSplitSpoonSampler(D&hI)[RingSampleWaterLevel0Approvedby:GrabSampleShelbyTubeSampleIWaterLevelatlimeofdrilling(ATD)IID’C‘00I0U,w FillMediumdense,moist.mtxedbrownandgray,fireItCoarseSAND,withsilt,fewfinegravel(SM).Loose,moist,brownanddarkbrown,fineSAND,fewtolittlesilt,tracefinegravel(SP-SM).LodgementTiltDense,moist!gray,finetocoarseSAND.withsilt,littlefinegravel(SM);nostratification.Smootherdrilling..\ssotiatcdruth,Sciciices,Inc.ExplorationLogElr—,ProjectNumberExplorationNumberSheet,4KE100287AEB-li1ofIProjectNameEarlyChildhoodCenterGroundSuriaceElevation(ft)N/ALocationRenton,WADatumN/Aoñ:ter/EquipmentBoretecitrack‘DateStarU’Finish71741117/24/11HammerWeigntDrop140#/30”doleDiameter(in)€‘=a-o-sBlows/FootSB:1’DESCRIPTION.0I1D203040Grassandtopsotl.IIIIIIIIIIIIIIII____________6S-i‘S6T516.25Ag495JS-317-402310S-4Becomesverydense.-,280/78Soitomotexplorationbonngatt1feet‘52325-30-35SamplerType(ST)———________________W2”CDSplitSpoonSampler(SPT)DNoRecoveryM-MoistureLoggedby:swoED3”CDSplitSpoonSampler(D&M)[RingSampleWaterLevelQApprovedby:GrabSampleShelbyTubeSampleIWaterLevelattimeofdrilling(ATD)004C000Lu4 ProjectNameLocationDrile‘[EcupmntHammerWeight/Drop_EadvChfldhoodCenterRenton.WA,\ssoci,itt’dli.rlhScience’,,Inc.ExplorationLogj—j—)ProjectNumberExptorationNumberSheetLicKE1002BTAEB-12lollBoretecrrrack14U#/3QflGroundSurfaceElevation(h)N/ADatumN/ADateStawFinisn7/74/117/74/11HoteDiameter(in)_ _ _ _ _ _ _ _ ___________ _ _ _ _ _DESCRIPTION5-200=a)0Uci>a)-Ja)I,Co0005Blows/Foot1020305-300a)FciCLodgementTillVerydense,moist,gray,finetomediumSAND,withsilt,fewfinegravel(SM);nostratiflcationAdvanceOutwashVerydense,moist,gray,fineSAND,fewsilt,tracecoarsesand/finegraveltSP).4010Bottomotexpto’aIcnboringat6112feet4751216‘665°2640‘50/0/’15-20-25-3035SampterTvpe(ST,):—-TCDSotitSpoonSampler(SPT)flNoRecoveryM-MoistureLoggedby:SWGYODSpii:SooonSampler(D&M)RingSample2WaterLeveljApprovedby:GrabSampteShelbyTubeSampleXWaterLevelattimeofdrUling(ATD)I 04‘34CCCtCC00122424290/Assnci,iledFaithSciences,liii.ExplorationLogDH“•ProjectNumberExplorationNumberSheettc’i.KE100287AEB-131of1ProjectNameEarlyChildhoodCenterGroundSuriaceElevation((I)N/ALocationRenlon,WADatumN/ADritterjEquipmentBorefeclTrackDaleSla,tfFinish7)74/117/24/11HammerWeighUDroo140#/30’HoleDiameter(in)-cHSaa-,Blows/Foot—‘aSS5T,ö“——DESCRIPTION-10203040—S1015IIIIIIIIIIIII1Grassandtopsoi:S1LodgemeniTiltMediumdense,moist,brown,finetocoarseSAND,wjhsill,littlefinegravel(SM)./AdvanceOutwashS2Dense,moist,gray.rineSAND,fewsill,tracecoarsesand/finegravel(SP);A8gradationalstratification,JGradeswithlittlesilt.Gradationalstratification.‘79Bottomofexplorationboringat6feel10-15-2D-25-30SamplerType(ST):UI2”00SptitSpoonSampler(SPT)JNoRecovery(.1-MoistureLoggedby:SWGUI3”00SplitSpoonSampler(0&M)IIRingSample-WaterLevelApprovedby:GrabSampleShelbyTubeSampleWaterLevelattimeofdrilling(ATO) :\ssnci.1[CLIEniiiSCiCHtt’S,Iiw.ExplorationLogr,C—,.”ProjectNumberExplorationNumberSheetL-iJ[LKE100287AEB-141of1ProjectNameEarlyChildhoodCenterGroundSurfaceElevation(II)N/ALocahonRenton.WADatumN/ADriller/EquipmentBoretec/TrackDateStart/Finish7/74/117/24/11HammerWeight/Drop140#/30”HoleDiameter(in),8’DESCRIPTIONTSamplerType(ST):—_ _ _____ _ ____ _ _ _ _ _ _ _2”ODSplitSpoonSampler(SPT)[NoRecoveryM-MoistureLoggedby:BWGrGDSphtSpoonSampler(D&M)[RingSampleWaterLevelApprovedby:GrabSampleSnelbyTubeSamoleIWalerLevelattimeofdrilling(ATD)S-i5-2S-3Ij102030409Grassandtopsoil.FillMediumdense,moist,ightbrown,fneSAND.withsilt,fewfinegravel(SM)Loose,moist,brcwn,OneSAND.withsit:,tracefinegravel(SM)Loose,moist,gray,OneSAND,fewsilt,fewcoarsesand/finegravel(SP).AdvanceOutwastVerydense,moist,gray,fineSAND,fewsiltandfinegravel(59.Borcrpofexp!oral:cr.beringa:1Ifeel42O350/’50/5101520253035I4a040CU,, AssocifleilEarthSciences,Inc.ExplorationLog—EDProjectNumberExplorationNumberSheet:KE100287AEB-151ofIProjectNameEarlyChildhoodCenterGroundSurfaceElevation(it)N/ALocationRenton,WADatumN/ADriller/EquipmentBoretec/TrackDateStart/Finish7/24/117/24/11HammerWeight/Drop140#/30”HoleDiameter(in)—U,=00=-JBlows/FootIsESBacrUDESCRIPTIONio203040Grassandtopsoil.LodgementTillMediumdense,moist,brown,finetomediumSAND,withsilt,fewfinegravel(SM).Becomesdense,brownishgray.Becomesverydense.Bottomoleploralionboringat6feelSamplerType(Sfl:UI200SplitSpoonSampler(5Ff)NoRecovery7.1-MoistureLoggedby:BWGUI3”00SplitSpoonSampler(0&M)[RingSampleWaterLevel()Approvedby:GrabSampleShelbyTubeSampleWalerLevelattimeofdrilling(ATD)Is-iJ5-2J5-3A2510IS141420200/A3450/5101520—25-3035IIIIIIIII1IIIIII0000.toCC00U,U,C P1jv4e(-3AssociatedEarthSciences,Inc.TechnicalMemorandumDate:August15,2011Page1To:CalvinGasaway,GreeneGasawayProjectName:EarlyChildhoodCenteratArchitectsHillcrestSpecialServicesDavidNason,AHBLFacilityDoreenGavin,AHBLDougDucharme,BLRBFrom:BruceGuenzler,L.GProjectNo:KE100287ACurtisRoger,L.G.,LEG.,L.Hg.Subject:PreliminaryDesignInfiltrationRateThepurposeofthismemoistosummarizeourinfiltrationfielddataandinfiltrationsystemdesignrecommendationsfortheproject.Forthisstudy,wecompletedinfiltrationratetestinginfourexcavatedpits.StratigraphyVashonadvanceoutwashwasencounteredbeneathVashonlodgementtillatmostofthelocationsintheareaoftheproposedbuildingandineachoftheexcavationsmadeforconstructionoftestpitdrains.VashonadvanceoutwashconsistsofsandsandgravelsdepositedinlakesandmeltwaterstreamsduringtheadvancingphaseoftheFrasierGlaciation.Theoutwashdepositsweresubsequentlycompactedbytheweightoftheoverlyingglacialice.Advanceoutwashdepositstypicallyexhibitgradationalstratification,includingstringersconsistingofsiltand/orsiltysand.Suchstratificationhasthepotentialtolimitadvanceoutwashsedimentsfromperformingwellasaninfiltrationreceptor.Theconstructionofinfiltrationpitdrains,asrecommendedinthismemo,penetrateslowpermeabilityfinegrainedinterbedsandsubstantiallyimprovestheabilityofadvanceoutwashtoseneasaninfiltrationreceptor.Thedepthoftheadvanceoutwashsedimentsvariesacrossthesite.Attheinfiltrationlestlocations,thedepthtothesesedimentsrangedfrom4.5feet(ft)belowgroundsurfaceto16ftbelowgroundsurface.InfiltrationTestingGenerally,theinfiltrationtestingmethodconsistedofcuffingtheexistingsodattheproposedtestinglocationsandexcavatingpitswiththetrack-mountedexcavator.Thepitswereexcavatedwithanapproximateareaof2.5feetwideby6.5to9feetlong,withapproximatedepthsof16.5to8feet,andhadrelativelyverticalsidewallsandflatbottoms.Waterwasprovidedbyanon-sitefirehydrant.Thefirstphaseoftestingconsistedofpre-testsoakingfollowedbyaconstantheadflowtestingphase.Waterwasintroducedthroughanelectronicflowmeterwithinstantaneousandtotalflowreadout,Thewaterlevelinthepitswasmonitoredinapolyvinylchloride(PVC)soundingpipe,placedonthebottomofthepit,withanelectronicwaterlevelmeter.Waterwasallowedtoriseinthepituntilthewaterlevelreachedthetopofthereceptorinordertosimulateproposedfacilityconditions.Afterthewaterlevelreachedthetargetlevel,theflowKirklandOffice•911FifthAvenue,Suite100•Kirkland,WA98033•P1(425)827-7701•F1(425)827-5424EverettOffice•29111/2HewittAvenue,Suite2•Everett,WA98201•P1(425)259OS22•F1(4251252-3408TacomaOffice•805MartinLutherKingJr.WaysTacoma,WA98405•P1(253)722-2992•F1(253)722-2993www.aesgeo.com IAssociatedEarthSciences,Inc.TechnicalMemorandumwasreducedinordertomaintainaconstantwaterlevel(constanthead).Thedurationoftheconstantheadphasewasgenerally4hours.Readingsofthewaterlevel,instantaneousflowandtotalflowwererecordedatapproximately15minuteintervalsusingamanualelectronicflowmeter,andon15minuteintervalswithapressuretransducer.Thefinalphaseoftesting,thefallingheadphase,beganbydiscontinuingthewaterflowimmediatelyaftertheconstantheadphase.Afterdiscontinuingwaterflow,waterlevelsweremonitoredwithbothmanualelectronicwaterlevelmeterandpressuretransducermethods.Thedurationofthisphasevarieddependingontheinfiltrationrate.RecommendationsBasedontheperfonTlanceofinfiltrationtests,itisAESI’sopinionthattheon-siteVashonAdvanceOutwashsedimentsaresuitablefortheproposedinfiltrationpitdrain.Forpreliminarydesignpurposes,weanticipatethatapitwithdimensionsofatleast3feetwideby10feetlongand20feetdeepwillhavethecapacitytodisposeof0.020cubicfeetpersecond(cfs)ofstormwater.Weanticipatethatconstructionofthepitdrainswillbeperformedbyalargeexcavatorworkingatarmsreach.Trenchexcavationsarecurrentlyplannedforconstructionwithnear-verticalsidewallsandimmediatebackfillingoftheexcavatedpit.Basedontheobservedsoilconditionsinourexplorations,thismethodofconstructionisexpectedtobefeasible.However,areaswherewepreviouslyexcavatedtrenchesfortestingpurposesmayrequireslopingorsomeotherformofshoring,ifnecessary,duetothelooselyplacedexistingbackfill.Uponreachingthetotaldepthofexcavationforeachpit,thetrenchshouldbebackfilledwithfree-draininggranularmaterial,suchasclean,washedpeagravelorotherfree-drainingmaterial,asspecifiedbelow.Asampleofthefree-drainingmaterialshouldbemadeavailabletoAESIatleast1weekpriortodrainconstruction,sothatlaboratorytestscanbeperformed,asneeded.Afterdrainbackfillingandpriortoinstallingsurfacetreatments,thepeagravelmustbewater-settledtominimizesettlementofthepeagravelbackfilloncethefacilityis“online.”AESImustbepresentduringexcavationofthefacilityandduringdraintesting.ThefinalengineeringdesignforthestormwaterfacilitymustbereviewedbyAESItoconfirmtheconclusionsandopinionsascontainedinthismemo.Is€ct:.0o.oz.ocvfk’,4Date:August15,2011ProjectNo:KE100287APage2 GRAINSIZEANALYSIS-MECHANICALDateProjectProjectNo.SoilDescription11/15/2010EarlyChildhoodCenterKE1002B7ATestedByLocationEB’EPNoDepthSandfewsilttracegravelMSOnsiteEB-6S-520’Wt.ofmoisturewetsample+Ta335,45TotalSampleTare29908Wt.ofmoisturedrySample+Tare31595TotalSamplewI+tare692.02Wt.ofTare100.9TotalSampleWt392.9WIofmoistureDrySample215.05TotalSampleDryWt3603Moisture%9%Specif.cationRegukementsSieveNo.Diam.(mm)WIRetained(g)0/0Retained%PassingMinimumMaximum3.590-100,00376.1-100.002.564-100.00250.8-100.001.538.1-100.00125.4-oo.oo3/419-100.003/89.51-100.00#44.760.850.2499.76#62.381.110.3199.69#1024.311.2098.80#200.8582.622.9377.07#400.42227.05f63.023698#60—0.25]304[84.3815.62#1000.149]304.19L84.4315.57#2000.074329.2791.39861USSTANDARDSIEVENOS.3”3/4”NONOISND4010200100‘ .t’:‘.‘!j,{wi’.95O1’.l::iLi.,,, , ,,, •,E.I!4Qii20l.—.010010101001GrainSize,mm80::,ASSOCIATEDEARTHSCIENCES,INC.911SNAve.Sj/IeICCKirkianaWA9833325.827.77CAX425.827.5424 p——a—a—aaaaaaaaaaa 7.0OTHERPERMITSOtherpermitswillberequiredforthecompletionoftheproject.Thesepermitsinclude,butarenotlimitedto,buildingpermitsandaNationalPollutantDischargeEliminationSystem(NPDES)GeneralStormwaterConstructionPermit.TechncaIInlormationReportRentonEarlyChildhoodLearningcenter7-1Q I8.0CSWPPPANALYSISANDDESIGNTheproposeddevelopmentshallcomplywithguidelinessetforthinCityofRentondrainagerequirements.Theplanwillincludeerosion/sedimentationcontrolfeaturesdesignedtopreventsediment-ladenrunofffromleavingthesiteoradverselyaffectingcriticalwaterresourcesduringconstruction.AConstructionStormwaterPollutionPreventionPlan(CSWPPP)isprovidedunder5eparatecover.iThefollowingmeasuresareshownontheESCplansandwillbeusedtocontrolsedimentation/erosionprocesses:•ClearingLimits—Allareastoremainundisturbedduringtheconstructionoftheprojectwillbedelineatedpriortoanysiteclearingorgrading.•CoverMeasures—Covermeasureswillbeimplementedtothedisturbedareas.•PerimeterProtection—Filterfabricfencesforsiterunoffprotectionwillbeprovidedatthedownstreamsiteperimeter.•TrafficAreaStabilization—StabilizedconstructionentrancesconsistingofquarryspallsandfutureparkingareaswithATBwillbeusedduringconstructionoftheproject.•SedimentRetention—Sedimentationtanksandasedimentpond,locatedinarough-gradedpermanentraingardenarea,willbeusedforsedimentretention.DesigncalculationsareprovidedinFigure8-1.Thesedimentationtanksandthesedimentpondaresizedforthe10-yearstormevent,andthusmeettheflowcontrolrequirementsduringconstruction.•StormDrainInletProtection—Filterfabricprotectionwillbeprovidedonallnewandexistingcatchbasinsdownstreamofconstructionactivities.•SurfaceWaterCollection—Interceptorswaleswillbeinstalledtodirectrunofffromtheextentsofthesitetothesedimentpondandbakertanks.•DewateringControl—Dewateringwater,whichhassimilarcharacteristicstostormwaterrunoffatthesite,shallbedisposedofthroughoneofthefollowingoptionsdependingonsiteconstraints:1.Infiltration;2.Transportoffsiteinavehicle,suchasavacuumflushtruck,forlegaldisposalinamannerthatdoesnotpollutesurfacewaters;3.Dischargetothesanitarysewerdischargewithlocalsewerdistrictapprovalifthereisnootheroption;or4.Useofasedimentationbagwithoutfalltoaditchorswaleforsmallvolumesoflocalizeddewatering.Clean,non-turbiddewateringwater,suchaswell-pointgroundwater,maybedischargedviastableconveyancetosystemstributarytosurfacewaters,providedthedewateringflowdoesnotcauseerosionorfloodingofreceivingwaters.Highlyturbidorcontaminateddewateringwatershallbehandledseparatelyfromstormwater.TechnicalInformationReportRentonEarlychildhoodLearningcenters-imoo!21051510 DustControl—Dustcontrolmeasureswillbeimplementedwhenexposedsoilsaredrytothepointthatwindtransportispossible,androadways,drainageways,orsurfacewatersarelikelytobeimpacted.FlowControl—FlowcontrolwillbeprovidedthroughtheuseofaBMP:fullinfiltrationisproposedintheformofinfiltrationtrenches.Siterunoffwillbeentirelyinfiltratedonsiteininfiltrationtrenches.TechnicalInformationReportRentonEarlyChildhoodLearningCenter8-2000! ISection8.0FiguresIIFigure8-1SedirentRetentionCalculationsIIIIIIIITechnicalInlormationReportRentanEarlychildhoodLearningCenterDm0! 051b20I2SEDIMENTATIONTANKCALCULATIONSThetotaldisturbedarea(TotalSiteareatogetherwiththeOffsitePlaygroundarea)thatwillbecollectedinsedimentationtanksis8.522acres.KCRTSInputParametersfortheexistingorpredevelopedsiteconditionsareshownintheincludeddatainputsheets.Modelingtheentiresitewithexistingsiteconditionsyieldsthefollowingpredevelopedpeaks:PlowFrecuencvknalvsisTimeSeriesFjle:Disturbedpre.tsfProjectLocatton:Sea-Tac9mb0.990225.000.960310.000.90045.000.80053.300.6.6752.000.50071.330.23181.100.09150.000.980RentonECLCIOF!’)-——AnnualPeakFlowRates—-—FlowRateRankTimeofPeak(CFS)0.87:42/39/012:000.60981/05/0216:001.0922/27/037:00FlowFrequencyAnalysi-—Peaks--RankReturn(CFS)Period1.75.0c.oo0.7090.7511.331.75ComputedPeaks78/26/042:00510/28/0416:0361/18/0616:0031C,’25/060:0011/09/086:001.091.030.8710.8420.7513.7090.6091.53SedimentRetentionCalculationsFigure8-) KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:5/11/2012BasinName:TotalDisturbedArea:ExistingConditionFileName:DISTURBEDPRERegion:SeatacScaleFactor:1.00TimeStep:HourlyRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sflAcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePerviousAreasOutwashGrass2472895.677Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertstoImperviousAreas2.8451.002.8450.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass5.677Wetland----EffectiveImpervious----2.845TotalAreaCheck‘8FlowPathOataLandUseLengthSlopeNotes:Thetotaldisturbedareathatwillbecollectedbythebakertanksis:7.723acresofTotalSite+0,799acresofOffsitePlayground8.522acresIIII1IIII‘I12_oP1% 05‘H2012KCRTSInputParametersforthedevelopedsiteconditionsareshownintheincludeddatainputsheets.Modelingtheentiresiteinthedevelopedcondition,andassumingtheOffsitePlaygroundAreais80%impervious.yie’dsthefollowingpeaks:FlowFrequencyAnalysisTimeSeriesFile:Disturbedflev.tsfProjectLccation:Sea—Tac---AnnualPeakFlowRates-—-FlowRateRankTimeofPeak(OFf)1.5262/09/012:001.2552/05/0216:001.8332/27/037:001.4878/26/042:001.75410/28/0416:00:.Ei51/18/3616:002.15210/25/060:002.9911/05/086:00RentonECLCSedimentRetentionCalculationsFlowFrequencyAnalysis-—Peaks--RankReturnProb(OFf)Period2.991100.000.9902.15225.000.9631.83310.000.9001.7545.000.8001.5453.000.6671.5262.000.5001.4871.300.2311.2681.100.3912.7150.000.980ComputedPeaksoP1’Figure8-1 KCRTSDataEntry&ComputationSheetProject:210515.10-RentonECLCpage1ofCompby:JMKDate:5/11/2012BasinName:TotalDisturbedArea:DevelopedConditionFileName:DISTURBEDDEVRegion:SeatacScaleFactor:100TimeStep:HourlyRecordLength:ReducedTotalAcreage:L__________PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(sOAcreageTillForestTillPastureTillGrassOutwashForestOutwashPasturePeMousAreasOutwashGrass113,1362.597Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas5.9251.005.9250.000N/AAdjustedLandUseAreasBasedonElFCalculationsKCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass2.597Wetland----EffectiveImpervious——5.925TotalAreaCheckr,aS1484kat?.aFlowPathDataLandUseLengthSlopeNotes:Thetotaldisturbedareathatwillbecollectedbythebakertanksis:7.723acresofTotalSite+0.799acresofOffsitePlayground8.522acresAdditionalplaygroundareaassumedtobe80%impervious.IIIIIIIIIIIqop1 05112012AdetentionvaultwassizedusingKCRTS.todeterminetherequiredvolumeforthebakertanks:RetentcnJDetertionFacilatyTypeofFacility:DetentionVaultFacilityLength:47.36ftFacilityWidth:47.36ftFacilityArea:2243.sq.ftEffectiveStorageDepth:7.00ftStage0Elevation:0.00ftstorageVolume:15698.Cu.Ft=117,430gallonsRiserHead:7.00ftRiserDiameter:12.00inchesNuuberoforifices:FullHeadPipeOrifice#HeightDiameterDischargeDiameter(ft)(in)(CFS)(in)10.003.731.00025.250.920.0304.0‘opNotchWeir:NoneOutflowRatingCurve:NoneStageElevationStorageDischargePercolation(ft)(ft)(cu.ft)(ac—ft)(cfs)(cfs)3.000.000.0.0CC0.0000.000.040.0490.0.0020.0750.000.080.0673.0.0040.1050.000.120.12269.0.0060.1290.000.160.16359.0.0080.1490.000.190.19426.0.0100.1670.000.230.23516.0.0:20.1230.000.270.27606.0.0140.1970.000310.3:695.0.0150.11:0.000.430.43964.0.0220.2480.000.550.551233.0.0280.2800.000.670.671503.0.0340.3090.003.730.79:772.0.04:0.3350.000.900.902018.0.0460.3590.001.011.022167.3.3533.3820.001.141.142557.0.0590.4040.001.261.262826.0.0650.4240.001.381.383095.0.0710.4440.001.501.303364.0.0770.4530.001.621.623533.0.0830.4800.001.731.733280.0.0890.4980.001.851.854149.0.0950.5150.001.971.974418.0.1010.5310.002.092.094687.0.1080.5470.002.2:2.214956.0.fl40.5620.002.332.335225.0.1200.5770.002.452.455494.0.1260.5910.002.572.575753.0.1320.6050.002.682.686010.0.1380.6190.002.802.806279.0.1440.6330.002.922.925548.OZSO0.6460.003.043.0468:7.0.1570.6590.03RentonECLCSedimentRetentionCalculationsFigure8-! 05/11/201213.163.167086.0.1630.6720.003.283.287356.0.1690,6840.003.403.407625.0.1750.6970.003.513.517871.9.1810.7050.003.633.638:43.c.:670.7200.003.753.758410.3.1930.7320.003.873.875679.0.1990.7440.003.993.598948.0.2050.7550.004.114.119217.0.2120.7660.004.234.239486.0.2180.7770.004.344.349733.0.2230.7880.004.464.4610002.0.2300.7990.004.584.5810271.0.2360.8090.004.704.7010540.3.2420.8150.004.324.82:0809.0.2483.8300.004.944.9411078.0.2540.8400.005.065.0611347.0.2600.3500.005.185.18:1616.0.2670.8600.005.255.2511773.0.2700.6660.005.265.2611796.0.2710.8670.005.275.2711818.0.2710.8680.005.285.2811841.0.2720.8700.005.295.2911863.0.2720.8720.005.305.3011885.0.2730.8740.005.315.311:938.2.2730.860.005.325.3211930.0.2743.8770.005.335.33fl953.3.2740.8790.005.445.4412199.0.2803.891C.0C5.565.56:2468.0.2860.9043.005.685.6812739.0.2920.9160.005.805.8013007.0.2990.9270.005.925.9213276.0.3050.9380.006.046.0413545.0.3110.9490.006.166.1613814.0.3170.9600.005.286.2814083.0.3230.9700.006.356.3914330.3.3290.9800.006.516.5114599.0.3353.9900.006.636.63:4868.0.3411.0000.006.756.7515137.0.3471.0100.306.876.8715406.0.3541.0200.006.996.9915675.0.3601.0300.007.007.0015698.0.3601.0300.007.107.1015922.0.3661.3500.007.207.2016146.0.3711.9200.007.307.3016370.0.3762.6500.007.407.4016595.0.3513.4500.007.507.50:6819.2.3663.7400.007.637.6017043.0.3914.0100.007.707.7017267.0.3964.2530.007.807.80:7492.3.4024.4700.307.907.9017716.0.4074.6900.008.008.0017940.0.4124.8900.008.108.1018164.0.4175.0800.008.208.2018389.0.4225.2600.008.308.3018613.0.4275.4400.008.408.4018837.0.4325.6100.008.508.53:9061.0.4385.7700.00RentonECLCSedimentRetentionCalculationsFigure8-1 05:1120128.608.6019286.0.4435.9300.008.708.7019510.0.4486.0900.008.808.8019734.0.4536.2400.008.908.9019958.0.4586.3800.00:nfltwoutflowPeakSterageTar;etCabStageSlav(Cu—Pt)Ac—Ft)I1.751.031.037.007.0015532.0.36021.09“““0.632.802.806278.0.14430.75“““*0.582.372.375315.0.12240.87“““0.582.372.375307.0.12250.73*******0.562.162.164852.0.11150.840.521.901.901270.0.09370.610.381.031.032307.0.05380.710.381.011.312262.0.052Sedimentationtanksizingsummary:Collectionarea=8.522acresStoragerequired=118,000gallonsCombinedmaximumallowablereleaserate=1.03CFS(thepredev10-yearstormevent)Turbiditysamplingisrequired;turbiditybenchmarkis25NILorless.SeeNPDESpermitforadditionalrequirements.RentonECLCSedimentRetentionCalculationsFigure8-1 05/11/2012SEDIMENTPONDCALCULATIONSITheapproximateareacollectedbytheNorthSedimentPondis3.386acresperthemapinthefollowingpages.AnalyzingtheMarthSedPondDcvtimeseriesusing5minutetimestepsinKCRTSyieldsthefollowingpeaks:IFlowFrequencyAnalysisTameSeriesFile:NorthSedpondflevl5min.tsfProjectLocation:Sea—Tac———AnnualPeakflowRates———FlowFrenuencyAnalycFlowRateRar.kTimeofPea:-:——Peaks——RankReturnProb(CFS)(CFS)Period0.99668/27/01:8:002.541100.000.9900.69589717/0217:451.90225.000.960I1.90212/08/3217:151.35310.000.9000.80278/23/0414:301.1145.000.8001.05510/28/0416:001.0553.000.6671.11410/27/0510:450.99662.000.5001.35310/25/0622:450.80271.300.2312.5411/09/086:300.E9581.100.091Comcj:edPeaks2.3350.000.930IIIRentonECLCSedimentRetentionCalculationsFigure8-1 KCRTSDataEntry&ComputationSheetProject:21051510-RentonECLOpage1ofCompby:JMKDate:5/11/2012BasinName:NorthSedimentPondDevelopedCondthon15-mmFileName:NDRTHSEDPDNDDEV15MINRegion:SeatacScaleFactor:100TimeStep:15-mmRecordLength:ReducedTotalAcreage:PerviousLandTypesLandUseKCRTSSoilGroupCoverGroupArea(Sf)AcreageTillForestTillPastureTillGrassQutwashForestOutwashPasturePeMousAreasOutwashGrass424340.974Wetland--ImperviousLandTypesLandUseAcreageElFEIANonEffectiveAreaRevertsto:ImperviousAreas2.0921.0020920.000N/AAdjustedLandUseAreasBasedonElFCalculations—KCRTSSoilGroupCoverGroupAddedAcreageComputedAcreageforModelTillForestTillPastureTillGrassOutwashForestOutwashPastureOutwashGrass0.974Wetland——EffectiveImpervious----2,092TotalAreaCheck3067,•*&FlowPathDataLandUseLengthSlopeNotes:Thetotaldisturbedareathatwillbecollectedbythebakertanksis:7.723acresofTotalSite+0799acresofOffsitePlayground8.522acresTheapproximateareacollectedbytheNorthSedimentPondis3.067acres.‘OFI3 ———————a—a————— OFFSITEPLAYGROUNDcthàáTACOMASEATT1215North30thStreet,Suite300,Tacoma,WA2006thAvenue,Suite1620,Seotue,WA98101L&,,—253.383.2422TEL206.2672425TELl9oIc1.-.-——140FEET16THAVEAR/ASOUTHBLDG34NORTHBLDG34/—-7.//IKLCRESTUJfIEaIERENTONNORTHSEDIMENTPONDAREADEVELOPEDCONDITION FIëJUIF-E9-1Project._..iiv_‘SubjectWith/ToAddressDateProjectNo,/PhoneFax##FaxedPagesBy/(I.Pageof2UCalculationsCFaxUMemorandumCMeetingMinutesUTelephoneMemo•IICivilEngineers{1,!)j<fl/HLI’S]//’VcRStructuralEngineersS-ijiyiv%o(eLandscapeArchitects:y’C\/Vr.?‘?C5I.c-PsCo7C.—,6/,gCommunityPlannersLandSurveyorscL.‘)v.td%\.-(.Ch-c71vir0o.Neighbors—,IJ,Pti;.I;(/5,1@e/Lu.77,92IE:5z)s7/CTACOMA2215N.30thSt.Suite300Tacoma,WA98403-3305/5n•i-(+.iiOFl253.383.2422253,383.2572FM12006thAvenueSuite1620Seattle,WA98101-3123206.267.2425206.267.2429FAXC,.J/(0.-I--‘I=‘7>:Co1’Hidci/tdk/IC!aJj/64-j.’!/.,eL*VJV(Lt13‘ ,:/-I-/k34-.CL(/-(/i/6;vzgt(/vfi/7’,AlaICfSp)Iv!Ckjf/;nit./-.;d--177:1/5u/c-f’.CSEATTLEIfthisdoesnotmeetwithyourunderstanding.pleasecontactusinwritingwithinsevendays.THANKYOU. Projectitit!LCL-SSubjectWith!TDAddress________________________Datec.S/2i!—ProjectNo.____________Phone__________________Fax##FaxedPages_________ByCivilEngineersE-k1,ii1‘-/5?,uik1z1VStructuralEngineersN—.b.)yI4i-=3S2i)j-)IA3ri2.,SfIij1’hcSTip,ZLOH-C1,OFjf’CC2&iqt•&TACOMA2215N.30thSt.Suite300Tacoma,WA98403-3305253.383.2422253.383.2572FAXUSEATTLE12006thAvenueSuite1620Seattle,WA1lOF!98b01-3123-PageZof..jUCalculationsUFaxUMemorandumUMeetingMinutesUTelephoneMemoJrs0L=L/7o../IU,.Ltgtji)i’v/Lr!t./A0>‘iHiLandscapeArchitectsCommunityPlannersLandSuweyorsNeighborsIA=-_iHII--II=(&ti(v)V(i.’d’)([c;V)III(cvinec4Cd*0a5*Ifthisdoesnotmeetwithyourunderstanding,pleasecontactusinwritingwithinsevendays.THANKYOU.206.287.2425206.267.2429FAX 5.3.4CONTROl.STRUCrURES—METHODSOFAN.4L1515RiserOverflowThenomographinFigure5.3.4.Hmaybeusedtodeterminethehead(infeet)aboveariserofgivendiameterandforagivenflow(usuallytheIOO-vearpeakflowfordevelopedconditions).FIGURE5.3.4.HRISERINFLOWCURVES‘DevLL0P€d;12equ/vet!giScVri1liiic-bc=ic“1000=0LI)10Is0.0U0.1110HEADINFEET(measuredfromcrestofriser)n—n7dweirn—,7on2Lil’2onco—0incfs,DandHinfeetSlopechangeoccursatweir-orificetransition2009SurfaceWaterDesignManual5-471/9/2009 9.0BONDQUANTITIES,FACILITYSUMMARIES,ANDDECLARATIONOFCOVENANTTheFinalTIRforthissitewillcontainSiteImprovementBondQuantityWorksheets,aFlowControlandWaterQualityFacilitySummarySheet,andaDeclarationofCovenant,asrequiredforprojectplansubmittal.TechnicalInformationReportRentonEarlychildhoodLearningcenter94GODS 10.0OPERATIONSANDMAINTENANCEPLANThedrainagefacilitiesdetailedinthisreportwillbemaintainedbytheRentonSchoolDistrict.AnOperationsandMaintenanceManualisincludedinthissection.TechnicalInformationReportRentonEarlychildhoodLearningCenter10-1000! Section10.0FiguresFigure10-1OperationsandMaintenanceManualTechnicalInformationReportRentonEañychildhoodLearningCenterQ00S APPENDIXAMAINTENANCEREQUIRLMENFSFORFLOWCONTROL,CONVEyANCE.ANDWQFACILITIESNO.2—INFILTRATIONFACILITIESMaintenanceDefectorProblemConditionsWhenMaintenanceIsNeededResultsExpectedWhenComponent-MaintenanceIsPerformedSiteTrashanddebrisAnytrashanddebriswhichexceedIcubicfootTrashanddebrisctearedfromsite,per1,000squarefeet(thisIsaboutequattotheamountoftrashitwouldtaketofituponestandardsizeofficegarbagecan).tngenerat,thereshoutdbenovisualevidenceofdumping.NoxiousweedsAnynoxiousornuisancevegetationwhichmayNoxiousandnuisancevegetationconstituteahazardtoCountypersonnetortheremovedaccordingtoappticabtepubticregutations.NodangerofnoxiousvegetationwhereCountypersonnetorthepubticmightnormaltybe.ContaminantsandAnyevidenceofcontaminantsorpottutionsuchMaterialsremovedanddisposedofpotlution.asoil,gasoline,concretesturnesorpaint,accordingtoapplicableregutationsSourcecontrotBMPsimptementedif;appropriateNocontaminantspresentotherthanasurfaceo,tflimGrass/groundcoverGrassorgroundcoverexceeds18inchesinGrassorgroundcovermowedtoaheightheightnogreaterthan6inches..tnfittrationPond,TopRodentholes‘AnyevidenceofroaenthotesiffacitityisactingRodentsremovedordestroyedandorSideSlopesofasadamorbern,oranyevidenceofwalerdamorbernrepairedDam,BernorpipingthroughdamorbernviarodentholesEmbankmentTreegrowthTreegrowththreatensintegrityofdams,bermsorTreesdonothinderfacitityslopes,doesnotattowmaintenanceaccess,orperformanceormaintenanceinterfereswithmaintenanceactivityIftreesareactivities,notathreattodam,berm,orembankmentintegrityornotinterferingwithaccessormaintenance,theydonotneedtoberemovedErosionErodeddamageover2inchesdeepwherecauseSlopesstabilizedusingappropriateofdamageisstitpresentorwherethereiserosioncontrolmeasuresIferosionpotentialforcontinuederosionAnyerosionisoccurringoncompactedslope,aobservedonacompactedslopelicensedcivilengineershouldbeconsultedtoresolvesourceoterosion.SettlementAnypadofadam,bermorembankmentthathasToporsidesloperestoredtodesignsettled4incheslowerthanthedesignelevationdimensionsIfsettlementis.significant,alicensedcivileng:neerishouldbeconsultedtodetermineithecauseofthesettlement.tnfiltrationFono,SedimentIItwoinchesormoresediment’spresentoraFacilityinfiltratesasdesignedTank,Vault,Trench,accumulationpercolationtestindicatesfacilityisworkingatororSmallBasinlessthan90%ofdesign.StorageAreaInfiltrationTankPluggedairventAnyblockageoftheventTankorvaultfreelyvents.StructureTankbentoutofAnypadoflank/pipeisbentoutofshapemoreTankrepairedorreplacedtodesign.shapethan10%ofitsdesignshapeGapsbetweenAgapwiderthan¼-inchatthejointofanytankNowaterorsoilenteringtanksections,damagedsectionsoranyevidenceofsoilparticlesenteringthroughjointsorwallsjointsorcracksorthetankatalointorthroughawatt.tearsInwallInfiltrationVaultDamagetowall,Crackswiderthan‘h-inch,anyevidenceofsoil‘JaultissealedandstructurallyStructureframe,bottom,and/orenteringthestructurethroughcracksorqualifiedsound.topslabinspectionpersonneldeterminesthatthevaultisnotstructurallysound.2009SurfaceWaterDesignManual-AppendixA1/9/2009A-3JOF1 APPENDIXAMAINTENANCEREQUIREMENTSFLOWCONTROL,CONVEYANCE.ANDWQFACILITIESI1/9/2009A-42009SurfaceWaterDesignManualAppendixAZopI5IIIIIIIIINO.2—INFILTRATIONFACILITIESMaintenanceDefectorProblemConditionsWhenMaintenanceIsNeededResultsExpectedWhenComponentMaintenanceIsPerformedInlet/OutletPipesSedimentSedimentfilling20%ormoreofthepipeInlet/outletpipesclearofsediment.accumulationTrashanddebrisTrashanddebrisaccumulatedininlet/outletNotrashordebrisinpipes.pipes(includesfloatablesandnon-floatables)DamagedCrackswiderthan‘A-inchatthejointoftheNocracksmorethan¼-inchwideatinlet/outletpipesoranyevidenceofsoilenteringthejointoftheinlet/outletpipe.atthejointsoftheinlet/outletpipes.AccessManholeCover/lidnotinplaceCover/lidismissingoronlypartiallyinplace.Manholeaccesscovered.Anyopenmanholerequiresimmediatemaintenance.LockingmechanismMechanismcannotbeopenedbyoneMechanismopenswithpropertools.notworkingmaintenancepersonwithpropertoolsBoltscannotbeseated.Self-lockingcover/liddoesnotworkCover/liddifficulttoOnemaintenancepersoncannotremoveCover/lidcanberemovedandremovecover/lidafterapplying80lbsoflift,reinstalledbyonemaintenanceperson.LadderrungsunsafeMissingrungs,misalignment,rust,orcracksLaddermeetsdesignstandardsAllowsmaintenancepersonsafeaccess.LargeaccessDamagedordifficultLargeaccessdoorsorplatescannotbeReplaceorrepairaccessdoorsoitdoors/platetoopenopened/removedusingnormalequipmentcanopenedasdesigned.Gaps,doesntcoverLargeaccessdoorsnotflatand/oraccessDoorscloseflatandcoversaccesscompletelyopeningnotcompletelycovered,openingcompletely.LiftingRingsmissing,LiftingringsnotcapableofliftingweightofdoorLiftingringssufficienttoliftorrustedorplate.removedoororplate.InfiltrationPond,PluggedFitterbagmorethan1/2full.ReplacefilterbagorredesignTank,Vault,Trench,system.orSmaltBasinFitterBagsInfiltrationPond!Sediment6”ormoreofsedimenthasaccumulated.Pre-settlingoccursasdesignedTank,Vault,Trench!accumulationorSmallBasinPresettlingPondsandVaultsInfiltrationPond,PluggedHighwaterlevelonupstreamsideoffilterRockfilterreplacedevaluateneedRockFilterremainsforextendedperiodoftimeorlittleornoforfitterandremoveifnotwaterflowsthroughfitterduringheavyrainnecessary.stormsInfiltrationPondRockmissingOnlyonelayerofrockexistsabovenativesoilinSpiltwayrestoredtodesignEmergencyOverflow.areafivesquarefeetorlarger,oranyexposureofstandards.Spittwaynativesoilatthetopofoutflowpathofspittway.Rip-raponinsideslopesneednotbereplaced.TreegrowthTreegrowthimpedesfloworthreatensstabilityofTreesremovedspittway. APPENDIXAMAINTENANCEREQUIREMENTSFORLOWCONTROL.CONVEYANCE.ANDWQFACILITIESNO.3—DETENTIONTANKSANDVAULTSMaintenanceDefectorProblemConditionsWhonMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedSiteTrashanddebrisAnytrashandoebnswhichexceed1cubicfootTrashanddebrisclearedfromsite.per1.000squarefeet(thisisaboutequaltotheamountoftrashitwouldtaketofilluponestandardsizeofficegarbagecan)Ingeneral,thereshouldbenovisualevidenceofdumpingNoxiousweedsAnynoxiousornuisancevegetationwhichmayNoxiousandnuisancevegetationconstituteahazardtoCountypersonnelortheremovedaccordingtoapplicablepublic,regulationsNodangerofnoxiousvegetationwhereCountypersonnel.orthepublicmightnormallybe.ContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedandd:sposedofpollutionasoil.gasotne,concreteslurriesorpaintaccordingtoapplicableregulationsSourcecontrol8MPsimplementeditappropriateNocontaminantspresentotherthanasurfaceoilfilmGrass/groundcoverGrassorgroundcoverexceeds18inchesinGrassorgroundcovermowedtoaheightheightnogreaterthan6inchesTarkorVaultTrashanddebr,sAnytrashanddebnsaccumuiaedinvaultortankNotrashordebrisinvaultStorageAxea(includesfloatablesandnon-floatabtes)SedimentAccumulateosedimentdepthexceeds10%oftheAl:sedimentremovedfromstorageaccumulationdiameterofthestorageareafor%Iengtnofareastoragevaultoranypointdepthexceeds15%ofdiameter.Example.72-inchstoragetankwouldrequirecleaningwhensedimentreachesdepthof7inchesformorethan%lengthoftankTankStructurePluggedairventAnyblockageoftheventTankorvaultfreelyventsTankbentoutofAnypartoftank/pipeisbentoutofshapemore1Tankrepairedorreplacedtodesign.shapetnan10%ofitsdesignshapeGapsbetweenAgapw.derthan½-inchatthejointofanytankNcwaterorsoilentenngtanksections,damagedsectionsoranyevidenceofsoilparticlesenteringthroughjointsorwalls.jointsorcracksorthetankatajointorthroughawalltearsinwallVaultStructureDamagetowall,Crackswiderthan‘A-inch.anyevidenceofsoilVaultissealedandstructurallyframe,bottom,and/orenteringthestructurethroughcracksorqualifiedsound.topslabinspectionpersonneldeterminesthatthevaultisno:structurallysound.‘Inlet/OutletP:pesSedimentSedimentfilling20%ormoreofthepipeInlet/outletpipesdearofsediment.accumulationTrashanddebrisTrashanddebrisaccumulatedininlet/outletNotrashordebrisinpipespipes(includesfloatabtesandnon-floatables)DamagedCrackswiderthan½-inchatthejointoftheNocracksmorethan7.-inchwideatinlet/outletpipesoranyevidenceofsoilenteringthejointoftheinlet/outletpipeatthejointsoftneinlet/outletpipes2009SurfaceWaterDesignManuut—AppendixA1/9/2009A-5oFI5 APPENDIXAMAINTENANCEREQUIREMENTSFLOWCONTROL.CONVEYANCE.ANDWQFACILITIESNO.3—DETENTIONTANKSANDVAULTSMaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedAccessManhoeCover/lidnotinplaceCover/lidismissinooronlypaniallyInplaceManholeaccesscovered•Anyopenmanholerequiresimmediatemaintenance.LockingmechanismMechanismcannotbeopenedbyoneMechanismopenswithpropertools.notworkingmaintenancepersonwithpropertoolsBoltscannotbeseated.Self-lockingcover/liddoesnotwork.Cover/liddifficulttoOnemaintenancepersoncannotremoveCover/lidcanberemovedandremovecover/lidafterapplyingRDlbsoflift,reinstalledbyonemaintenancepersonLadderrungsunsafeMissingrungs,misalignment,rustora-acksLaddermeelsdesignstandards.iAhowsmaintenancepersonsafeaccess.LargeaccessDamagedordifficultLargeaccessdoorsorplatescannotbeReplaceorrepairaccessdoorsoitdoors/platetoopenopened/removedusingnormalequipmentcanopenedasdesignedGaps,doesntcoverLargeaccessooorsnotflatand/oraccessDoorsdoseHalandcoversaccesscomplelelyopeningnotcomplelelycovered,openingcompletelyLiftingRingsmissing,LiftingnngsnotcapableofliftingweightofdoorLiftingringssufficienttoliftorrustedorplateremovedoororplateIIIIIII1‘912009A-62009SurfaceWalerDesignManuai—AppendixAII‘-/0F15I APPENDIXAMAINTENANCEREQUIREMENTSFORFLOWCONTROL,CONVEYANCE.ANDWQFACIUIlLSNO.5—CATCHBASINSANDMANHOLESSedimentexceeds60%ofthedepthfromthebottomofthecatchbasintotheinvertofthetowestpipeintooroutofthecatchbasinoriswithin6inchesoftheinvertofthelowestpipeintooroutofthecatchbasinAnyevidenceofcontaminantsorpollutionsuchasoil,gasoline,concreteslurriesorpaint.Sumpofcateibasincontainsnosediment.Materialsremovedanddisposedofaccordingtoapplicableregulations.SourcecontrolBMPsimplementedifappropriateNocontaminantspresentotherthanasurfaceoilfilm,2009SurfaceWaterDesignManual—AppendixAA-91/9/2009StructureSedimentMaintenanceDefectorProbtemConditionWhenMaintenanceisNeededResultsExpectedWhenComponent.MaintenanceisPerformedTrashanddebrisTrashordebrisofmorethan¼cubicfootwhichNoTrashordebhsblockingorislocatedimmediatelyinfrontofthecatchbasinpo:entiallyblockingenirancetoopeningor’sblockingcapacityofthecatchbasincatchbasir,bymorethan10%TrashordebrisinthecatchbasinthatexceedsNotrashordebnsinthecatchbasin‘I,thedepthfromthebottomofbasintoinvertthelowestpipeintooroutofthebasin.DeadanimalsorvegetationthatcouldgenerateNodeadanimalsorvegetationodorsthatcouldcausecomplaintsordangerouspresentwithincatchbasingasesfeg.,metnane)DepositsofgarbageexceedingIcubicfootnNocond;tionpresentwhichwouldvolumeattractorsupporttheoreed:ngofinsectsorrodentsDamagetoframeCornerofframeextendsmorethan‘/4inchpastFrameisevenwithcurb.and/ortopslabcurbfaceintothestreet(Ifapplicable)Topslabhasholeslargerthan2squareinchesorTopslabisfreeofholesandcrackscrackswidertnan1,4inchFramenotsittingflushontopslab.ie,Frameissittingflushontopslabseparationofmorethan,4incooftheframefromthetopslab.CracksinwattsorCrackswiderthan¼inchandlongerthan3feet,Catchbasinisseatedandbottomanyevidenceofsoilparticlesenteringcatchstructuratlysound.basinthroughcracks,ormaintenancepersonjudgesthatcatchbasinisunsound.Crackswiderthan¼inchandlongerthan1footNocracksmorethan‘/4inchwideatatthejointofanyinlet/out.etpipeoranyevidencethejointofinlet/outletppeofsoi:partidesenteringcatchbasinthroughcracksSetttementlCatchbasinhassettledmorethan1inchorhasBasinreplacedorrepairedtodesignmisalignmentrotatedmorethan2inchesoutofalignmentstandardsDamagedpipejointsCrackswiderthanWinchatthepintoftheNocracksmorethan‘/.-inchwideatinlet/outletpipesoranyev,denceofsoilenteringthejointofinlet/outletpipesthecatchbasinatthejointoftheinlet/outletpipesContaminantsandpollutiontnlet/OuttetPipeSedimentSedimentfillina20%ormoeoftheppe.Inlet/outletpipesdearofsedimentaccumulationTrasnanddeorisTrashanddebrisaccumulatedininlet/outletNotrashordebrisinpipespipes(includesfloatablesandnon-floatables)DamagedCracksderthan¼-inchatthejointoftheNocracksmorethan1h-inchwideatinlet/outletpipesoranyevidenceofsoilenteringthejointoftheinlet/outletpipeatthejointsoftheinlet/outletpipes.S0F15 APPENDIXAMAINTENANCEREQUIREMENTSFLOWCONTROL,CONVEYANCE,ANDWQFACILITIESIMaintenanceDefectorProblemConditionWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedMetalGratesUnsafegrateopeningGratewithopeningwiderthan‘Jinch.Grateopeningmeelsdesign(CatchBasins)standards.TrashanddebrisTrashanddebristhatisblockingmorethan20%Gratefreeoftrashanddebris.ofgratesurfacefootnotetoguidelinesfordisposalDamageaormissingGratemissingorbrokenmember(s)ofthegrate.GrateisinplaceandmeetsdesignAnyopenstructurerequiresurgentstandardsmaintenance.ManholeCover/LidCover/lidnotinplaceCover/lidismissingoronlypartiallyinplace.Cover/lidprotectsopeningtoAnyopenstructurerequiresurgentstructure.maintenanceLockingmechanismMechanismcannotbeopenedbyoneMechanismopenswithpropertoolsNotWorkingmaintenancepersonwithpropertoolsBoltscannotbeseated.Self-lockingcover/liddoesnotwortCover/liddiffiwlttoOnemaintenancepersoncannotremoveCover/lidcanberemovedandRemovecover/lidafterapplftg80ibs,ofliftreinstalledbyonemaintenanceperson.1/9;2009A-102009SurfaceWaterDesignMasiual—AppendixAIIII(poFl5NO.5-CATCHBASINSANDMANHOLESIIIII API’ENDIXAMAINTENANCEREQUIREMENTSFORFLOWCONTROL.CONVEYANCE.ANDWQFACILITIESNO.6—CONVEYANCEPIPESANDDITCHESMaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformed.PioesSediment&debrisAccumulatedsedimentoroebristhatexceedsWalerflowsfreelythroughpipesaccumulation20%ofthediameterofthepipeVegetation/rootsVegetaton/rootsthatreducefreemovementotWalerflowsfreelythroughpipes.waterthroughpipesContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaintaccordingtoapplicableregulationsSourcecontrolEMPsimplementedifappropnateNocontaminantspresentotherthanasurfaceoilfilmDamagetoprotectiveProtectivecoatingisdamaged,rustorcorrosionPiperepairedorreplacedccatingorcorrosionisweakeningthestructuraintegrityofanypartofpipe.DamagedAnydentthatdecreasesthecrosssectionareaofPiperepairedorreplaced.pipebymorethan20%orisdeterminedtohaveweakenedstructuralintegrityofthepipeDitchesTrashanddebrisTrashanddebrisexceeds1cubicfootper1,000Trashanddebrisclearedfromsquarefeetofditchandslopes.dilches.SedimentAccumulatedsedimenttnatexceeds20%oftheDitchcleaned/flushedofallsedimentaccumu:ationdesigndepthanddebrissothatitmatchesdesignNoxiousweedsAnynoxiousornuisancevegetationwhichmayNoxiousandnuisancevegetationconstituteahazardtoCountypersonnelortheremovedaccordingtoapplicablepublic,regulations.NodangerofnoxiousvegetationwhereCountypersonnelorthepublicmightnormallybe.ContaminantsandAnyevidenceofcontaminantsorpollutionsuthMatenalsremovedanodisposecofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulationsSourcecontrolBMPsimplementedifappropriateNocontaminantspresentotherthanasurfaceoilfilmVegetationVegetationthatreducestreemovementofwaterWaterflowsfreelythroughditchesthroughditchesErosiondamagetoAnyerosionobservedonaditchslopeSlopesarenoterodingslopesRockliningoutofOnelayerorlessofrockexistsabovenativesoilReplacerockstodesignstandardsplaceormissing(Ifarea5squarefeetormore,anyexposednativeApplicable)sot.2009SurfaceWaterDesignManual-AppendixA1/9/2009A-Il7o/5 APPENDIXAMAThTENANCEREQUIREMEN]’SFORFLOWCONTROL,CONVEYANCE,ANDWQFACILITIESIMaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformed.SiteTrashanddebnsTrashand/ordebrisaccumulation,D-.ssipaterclearoftrashand/or.debris.ContaminantsandAnyevidenceofcontaminantsorpollutionsuchMalenatsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulations.SourcecontrolBMPsimplementedifappropriate.Nocontaminantspresentotherthanasurfaceoilfilm.RockPadMissingormovedOnlyonelayerofrockexistsabovenativesoilinRockpadpreventserosion.RockareafivesquarefeetorlargeroranyexposureofnativesoilDispersionTrenchPipepluggedwithAccumulatedsedimentthatexceeds2D%ofthePipecteanedlflushedsothatitsedimentdesigndepthmatchesdesignNotdischargingwaterVisualevidenceofwalerdischargingatWaterdischargesfromfeaturebyproperlyconcentratedpointsalongtrench(normalsheetflow.conditionisa“sheetflaw’ofwateralongtrench).Perforationsplugged.Over1/4ofperforationsinpipearepluggedwithPerforationsfreelydischargeflow.debrisorsediment.WaterflowsouttopofWaterflowsoutofdistributorcatchbasinduringNoflowdischargesfromdistributor“distnbutor”catchanystormlessthanthedesignstorm,catchbasin.basinReceivingareaover-WaterinreceivingareaiscausingorhasNodangeroflandslides.saturatedpotentialofcausinglandslideproblemsGabionsiDamagedmeshMeshofgabionbroken,tstedordeformedsoMeshisintact,norockmissing.structureisweakenedorrockmayfalout.;CorrosionGabionmeshshowscorrosionthrouahmorethanAtIgabionmeshcapableof¼ofitsgage.containingrockandretainingdesignedform.CollapsedorGabionbasketshapedeformedduetoanyAligabionbasketsintact,structuredetormedbasketscause.stanasasdesigned.MissingrockAnyrockmissingthatcouldcausegabiontoNorockmissing.loosestructuralintegrity.Manhole/ChamberWomordamagedStructuredissipatingflowdeterioratesto‘AorStructureisinnodangeroffailingpost,bafflesorsideoforiginalsizeoranyconcentratedwornspotchamberexceedingonesquarefootwhichwouldmakestructureunsound.Damagetowall,Crackswiderthan¼-inchoranyevidenceofsoilManhole/chamberissealedandframe,bottom,and/orenteringthestructurethroughcracks,or,structurallysound.topstabmaintenanceinspectionpersonneldeterminesthatthestructureisnotstructurallysound,DamagedpipejointsCrackswiderthan‘A-inchatthejointofthe,Nosoilorwaterentersandnowaterinlet/outletpipesoranyevidenceofsoilentenngdischargesatthejointofinlet/outletthestructureatthejointoltheinlet/outletpipes.pipes2009SurfaceWaterDesignManual—AppendixAA-13/9/2009SOF/5NO.8—ENERGYDISSIPATERSI1IIIIII APPEND[XAMANTENANCEREQUIREMENTSFLOWCONTROL.CONVEYANCE.ANDWQFACILITIESNO.9—FENCINGMaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedSiteErosionorholesErosionorholesmorethan4indieshighand12-Noaccessunderthefenceunderfence18incheswidepermittingaccessthroughanopeningunderafence.WoodPosts,BoardsMissingordamagedMissingorbrokenboards,postoutofptumbbyNogapsonfenceduetomissingorandCrossMemberspartsmorethan6inchesorcrossmembersbrokenbrokenboards,postptumbtowithin1%inches,crossmemberssound.WeakenedbyrottingAnypartshowingstructuraldeteriorationduetoAllpartsoffencearestructurallyorinsectsrottingorinsectdamagesound.DamagedorfailedConcreteormetalattachmentsdeterioratedorPostfoundationcapableofpostfoundationunabletosupportpostssupportingpastseveninstrongwind.MelalPosts,RailsDamagedpartsPostoutofplumbmorethan6inches.Postplumbtowithin1t4inchesandFabricToprailsbentmorethan6inches.Toprailfreeofbendsgreaterthan1inch.Anypartoffence(includingpost,toprails,andFenceisalignedandmeetsdesignfabric)morethan1tootoutofdesignalignment,standardsMissingorloosetensionwire.TensionwireinplaceandholdingfabricDelerioratedpaintorPanorparisthathavearustingorscalingSlructurallyadequatepostsorpartsprotectivecoatingconditionthathasaffectedstructuraladequacywithauniformprotectivecoating.OpeningsinfabricOpeningsinfabricaresuchthatan8-inchFabricmeshopeningswithin50%ofdiameterballcouldfitthroughgridsize1/9120092009SurfaceWaterDesignManual—AppendixAA-14qori5 APPENDIXAMAINTENANCEREQUIREMENTSFORFLOWCONTROL.CONVEYANCE,ANDWQFACILITIESINO.10—GATES/BOLLARDSIACCESSBARRIERSMaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedChainLinkFencingDamagedormissingMissinggate.Gatesinplace.Gatemembers..BrokenormissinghingessuchthatgalecannotHingesintactandtubed.Gateisbeeasilyopenedandclosedbyamaintenanceworkingfreely.person.Gateisoutofplumbmorethan6inchesandGateisalignedandvelica!morethan1footoutofdesignalignment.Missingstretcherbar,stretcherbands,andlies.Stretcherbar,bands,andtiesinplace.LockingmechanismLockingdevicemissing.no.functioningordoesLockingmechanismpreventsdoesnotlodcgatenotlinktoallpartsopeningofgate.Openingsinfabnc.Openingsinfaoncaresucnthatan8-inchFabricmeshopeningswith:n50%of.diameterballcouldfitthrough.‘gndsize.BarGateDamagedormissingCrossbardoesnotswingopenordosed,isCrossbarswingstullyopenandcrossbarmissingorisbenttowhereitdoesnotpreventclosedandpreventsvehicleaccess.vehicleaccessLockingmechanismLockingdevicemissing,no-functioningordoesLockingmechanismpreventsdoesnotlockgatenotlinktoallpartsopeningofgate.SupportpostSupportpostdoesnotholdcrossbarup.Crossbarhelduppreventingvehicledamagedaccessintofacility.BollardsDamagedormissingBollardbroken,missing,doesnotfitintosupportNoaccessformotorizedvehiclestoholeorhingebrokenormissing.getintofacility.DoesnotlockLockingassemblyorlockmissingorcannotbeNoaccessformotorizedvehiclestoattachedtolockbollardinplace.getintofacility.BouldersDislodgedBouldersnotlocatedtopreventmotorizedvehicleNoaccessformotorizedvehiclestoaccess,getintofacility.CircumventedMotorizedvehiclesgoingaroundorbetweenNoaccessformotorizedvehiclestoboulders,getintofacility.2009SurfaceWaterDesignManual—AppendixAA-151/9/2009/op/5I APPENDIXANtAINTENANCEREQUIREMENTSFLOWCONTROL.CONVEYANCE.ANDWQFACILmESNO.11—GROUNDS(LANDSCAPING)MaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformed•SiteTrashorlitterAnytrashanddebnswhichexceedIcubicfootTrashanddeorisclearedfroms:teper1000squarefeel(thisisaboutequaltotheamountoftrashitwouldlaketofilluponestandardsizeofficegarbagecan)Ingeneral,thereshouldbenovisualevidenceofdumping.NoxiousweedsAnynoxiousornuisancevegetationwhichmayNoxiousandnuisancevegetation‘constituteahazardtoCountypersonnelortheremovedaccordingtoapplicablepublicregutat:onsNodangerofnoxiousvegetationwhereCountypersonnel:orthepublicmightnormallybeContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulations.SourcecontrolBMPsimplementedifappropnateNocontaminantspresentotherthanasjhaceoifilm.Grass/groundcoverGrassorgroundcoverexceeds18inchesin‘Grassorgroundcovermowedtoa•height.heightnogreaterthan6inchesTreesandShrubsHazardAnytreeorlimbofatreeidentifiedashavingaNohazardtreesinfacilitypotentialtofallandcausepropertydamageorthreatenhumanlife.Ahazardtreeidentifiedbyaqualifiedarboristmustberemovedassoonaspossible.DamagedLimbsorpansoftreesorshrubsthataresplitorTreesandsnwbsthlesstflan5%brokenwhichaffectmorethan25%ofthetotaloftotalfoliagewithsplitorbroken‘foliageofthetreeorshrublimbsTreesorshrubsthathavebeenblowndownorNoblowndownvegetationorknockedover,knockedovervegetation.TreesorshrubsfreeofinjuryTreesorshrubswhicharenotadequatelyTreeorshrubinplaceandsupporledorareleaningover,causingexposureadequatelysu000fled;oeadoroftherootsdiseasedtreesremoved.1/9/2009A-162009SurfaceWaterDesignManual—AppendixAI1OF/5 ISECTIONC.2FLOWCONTROLUMPsThedepressionoverflowpointmustheatleast6inchesbelowadjacentpavementareaandmust1beedsothatoverflowdoesnotcauseerosiondoorunplannedinundation.4.Thedepressionsiesmusthenosteean3horizontaltoIvertical.5.Spacingbetweenmultipleinfidepressionsshallbeaminimumof4feet.6.Infiltrationdepressionsstbesetbackat15feetfrombuildingswithcrawlspaceorbasementelevationsthatareowtheoverflowpointoftheirationdepression.17.InfiltratdepressionsmaybeanysizeorshapeprovidedtheyespecificationsandtheminimumrerementsinSectionC.2.2.laremet.ThegroundsurfaceoftheinfiltrationdepressionmustbevegetatedwithgrassoerdensegroundIcover.C.2.2.6MAINTENANCEINSTRUCTIONSFORFULLINFILTRATIONIfthefullinfiltrationflowcontrolBMPisproposedforaproject,thefollowingmaintenanceandoperationinstructionsmustberecordedasanattachmenttotherequireddeclarationofcovenantandgrantofeasementperRequirement3ofSectionC.I.3.3(p.C-I8).Theintentoftheseinstructionsistoexplaintofuturepropertyowners,thepurposeoftheBMPandhowitmustbemaintainedandoperated.Theseinstructionsareintendedtobeaminimum:DDFSmayrequireadditionalinstructionsbasedonsite-specificconditions.Also,astheCounngainsmoreexperiencewiththemaintenanceandoperationoftheseBMPs.futureupdatestotheinstructionswillbepostedonKingCounty’sSw/ace(laterDesignAlanuatwebsite.UTEXTOFINSTRUCTIONSYourpropertycontainsastormwatermanagementflowcontrolOMP(bestmanagementpractice)called°fullinfiltration,”whichwasinstalledtomitigatethestormwaterquantityandqualityimpactsofsomeoralloftheimpervioussurfacesonyourproperly.Fullinfiltrationisamethodofsoakingrunofffromimperviousarea(suchaspavedareasandroofs)intothegroun&Ifproperlyinstalledandmaintained,fullinfiltrationcanmanagerunoffsothatamajorityofprecipitationeventsareabsorbed.Infiltrationdevices,suchasgravelfilledtrenches,drywells,andgroundsurfacedepressions,facilitatethisprocessbyputtingrunoffindirectcontactwiththesoilandholdingtherunofflongenoughtosoakmostofitintotheground.Tobesuccessful,thesoilconditionaroundtheinfiltrationdevicemustbereliablyabletosoakwaterintothegroundforareasonablenumberofyears.TheinfiltrationdevicesusedonyourpropertyincludethefollowingasindicatedontheflowcontrolBMPsiteplantDgravelfilledtrenches,Ddrywells.Dgroundsurfacedepressions.Thesize,placement,andcompositionofthesedevicesasdepictedbytheflowcontrolBMPsiteplananddesigndetailsmustbemaintainedandmaynotbechangedwithoutwrittenapprovaleitherfromtheKingCountyWalerandLandResourcesDivisionorthroughafuturedevelopmentpermitfromKingCounty.Infiltrationdevicesmustbeinspectedannuallyandaftermajorstormeventstoidentifyandrepairanyphysicaldefects,Maintenanceandoperationofthesystemshouldfocusonensuringthesystem’sviabilitybypreventingsediment-ladenflowsfromenteringthedevice.Excessivesedimentationwillresultinapluggedornon-functioningfacility.tftheinfiltrationdevicehasacatchbasin,sedimentaccumulationmustberemovedonayearlybasisormorefrequentlyifnecessary.Prolongedpondingaroundoratopadevicemayindicateapluggedfacility.Ifthedevicebecomesplugged,itmustbereplaced.Keepingtheareasthatdraintoinfiltrationdeviceswellsweptandcleanwillenhancethelongevityofthesedevices.Forroofs.frequentcleaningofgutterswillreducesedimentloadstothesedevices.l/9’20092009SurfaceWalerDesignManual—AppendixCC-4412op15 C.2.5RAINGARDENC.2.5.3MAINTENANCEINSTRUCTIONSFORARAINGARDENIftheraingardenflowcontrolBMPisproposedforaproject,thefollowingmaintenanceandoperationinstructionsmustberecordedasanattachmenttotherequireddeclarationofcovenantandgrantofeasementperRequirement3ofSectionC.1.3.3(p.C-IS).Theintentoftheseinstructionsistoexplaintofuturepropernowners,thepurposeoftheBMPandhowitmustbemaintainedandoperated.Theseinstructionsareintendedtobeaminimum;DDESmayrequireadditionalinstructionsbasedonsite-specificconditions.Also.astheCountygainsmoreexperiencewiththemaintenanceandoperationoftheseBMPs.futureupdatestotheinstructionswillbepostedonKingCounty’sSin/aceWaterDesignManualwebsite.TEXTOFINSTRUCTIONSYourpropertycontainsastormwatermanagementflowcontrolBMP(bestmanagementpractice)calledaraingarden,whichwasinstalledtomitigatethestormwaterquantityandqualityimpactsofsomeoralloftheimperviousornon-nativepervioussurfacesonyourproperty.Raingardens.alsoknownas“bioretention.”arevegetatedcloseddepressionsorpondsthatretainandfilterstormwaterfromanareaofimpervioussurfaceornon-nativepervioussurface.Thesoilintheraingardenhasbeenenhancedtoencourageandsupportvigorousplantgrowththatservestofilterthewaterandsustaininfiltrationcapacity.Dependingonsoilconditions,raingardensmayhavewaterinthemthroughoutthewetseasonandmayoverflowduringmajorstormevents.—Thesize,placement.anddesignoftheraingardenasdepictedbytheflowcontrolBMPsiteplananddesigndetailsmustbemaintainedandmaynotbechangedwithoutwrittenapprovaleitherfromtheKingCountyWaterandLandResourcesDivisionorthroughafuturedevelopmentpermitfromKingCounty.Plantmaterialsmaybechangedtosuittastes,butchemicalfertilizersandpesticidesmustnotbeused.Mulchmaybeaddedandadditionalcompostshouldbeworkedintothesoilovertime.Raingardensmustbeinspectedannuallyforphysicaldefects.Aftermajorstormevents,thesystemshouldbecheckedtoseethattheoverflowsystemisworkingproperly.Iferosionchannelsorbarespotsareevident,theyshouldbestabilizedwithsoil,plantmaterial,mulch,orlandscaperock.Asupplementalwateringprogrammaybeneededthefirstyeartoensurethelong-termsurvivaloftheraingarden’svegetation.Vegetationshouldbemaintainedasfollows:1)replacealldeadvegetationassoonaspossible;2)removefallenleavesanddebrisasneeded;3)removeallnoxiousvegetationwhendiscovered:4)manuallyweedwithoutherbicidesorpesticides;5)duringdroughtconditions,usemulchtopreventexcesssolardamageandwaterloss.2009SurfaceWaterDesignManual—AppendixCJ/912009C-63ISoPi’5 ISECTIONClFLOWCONTROLBMPsDesignSpecifications_z7’I1.Aminimumof6inchesoffreedrainingbasematerial(sandorgravel)isrequiredun(iiemodulargridmaterial.Themodulargridmaterialmustbeinstalledaccordingtothemanufacturersstructions.3.surfaceareaofthemodulargridopeningsmustbeatleast50%oftotalsurfaceareaofthemogridpavement.4.Themodurgridopeningsmustbefilledwithgravel,sand,ormixtureofboth.5.Smoothsuffacvalkwaysmayberunacrossmodulargriavements.provided(heimpervioussurfacedwalkwayonotexceed10percentofthetotpavementsurface.C.2.6.6GRASSEDMODULARIDPAVEINTGrassedmodulargridpavementisb‘callvadulargridpavementwithgrassplantedintheopeningsorinathinlayerofsoiloverthegridmai.Thebenefitsofthismeasurearereducedrunoffpeaksandvolumesresultingfromtheincreasedinfionofstormwater.theincreasedwaterstorageprovidedinthegridsoilandbase,andtheincreaseevapotspirationprovidedbythegrass.Thegrassedsurfacealsohelpsremovepollutantsthatareftbehindby‘ehicles.Uses:Low-trafficorinfrequtlyusedareassuchas-trafficdriveways,overflowparking,eventparking,churchpaing.employeeparking,maintnceaccessroads,etc.;theyarenotallowedinKingCountyadright-of-was’.DesignSpecifitions1.Aminimof6inchesoffreedrainingbasematerial(sandorgravel)requiredunderthemodulargridmerial.2.Tmodulargridmaterialmustbeinstalledaccordingtothemanufacturer’sinctions.3.hesurfaceareaofthemodulargridopeningsmustbeatleast50%ofthetotalsureareaofthemodulargridpavement.4.Themodulargridopeningsmustbefilledwithasandysoilmixsuitableforgrowinggrassspecifiedbythemanufacturer’sinstructionsoralandscapearchitect.5.Smoothsurfacewalkwaysmayberunacrossmodulargridpavements,providedtheimpervioussurfacedwalkwaysdonotexceed10percentofthetotalpavementarea.C.2.6.7MAINTENANCEINSTRUCTIONSFORPERMEABLEPAVEMENTIfthepermeablepavementflowcontrolBMPisproposedforaproject,thefollowingmaintenanceandoperationinstructions,plusanyprovidedbythemanufacturerorinstaller,mustberecordedasanattachmenttotherequireddeclarationofcovenantandgrantofcasementperRequirement3ofSectionC.l.3.3(p.C-18).Theintentoftheseinstructionsistoexplaintofutureproperty’owners,thepurposeoftheBMPandhowitmustbemaintainedandoperated.Theseinstructionsareintendedtobeaminimum;DDESmayrequireadditionalinstructionsbasedonsite-specificconditionsormanufacturer’srecommendations.Also,astheCountygainsmoreexperiencewiththemaintenanceandoperationoftheseBMPs.futureupdatestotheseinstructionswillbepostedonKingCounty’sSurfaceWalerDesignjianualwebsite.0TEXTOFINSTRUCTIONSFORNON-VEGETATEDPERMEABLEPAVEMENTYourpropertycontainsastormwatermanagementflowcontrolBMP(bestmanagementpractice)called“permeablepavement,”whichwasinstalledtominimizethestormwaterquantityandqualityimpactsof1/9/20092009SurfaceWaterDesignManualAppendixCC-66jqopic C2.6PEIUvIEABL.LPAVEMENTsomeorallofthepavedsurfacesonyourproperty.Permeablepavementsreducetheamountofrainfallthatbecomesrunoffbyallowingwatertoseepthroughthepavementintoafree-draininggravelorsandbed,whereitcanbeinfiltratedntotheground.Thetype(s)ofpermeablepavementusedonyourproperlyis:Uporousconcrete,Uporousasphalticconcrete,Upermeablepayers,Umodulargridpavement.TheareacoveredbypermeablepavementasdepictedbytheflowcontrolOMPsiteplananddesigndetailsmustbemaintainedaspermeablepavementandmaynotbechangedwithoutwrittenapprovaleitherfromtheKingCountyWaterandLandResourcesDivisionorthroughafuturedevelopmentpermitfromKingCounty.Permeablepavementsmustbeinspectedafteronemajorstormeachyeartomakesureitisworkingproperly.Prolongedpondingorstandingwateronthepavementsurfaceisasignthatthesystemisdefectiveandmayneedtobereplaced.Ifthisoccurs,contactthepavementinstallerortheKingCountyWaterandLandResourcesDivisionforfurtherinstructionsPtypicalpermeablepavementsystemhasalifeexpectancyofapproximately25-years.Tohelpextendtheusefullifeofthesystem,thesurfaceofthepermeablepavementshouldbekeptcleanandfreeofleaves,debris,andsedimentthroughregularsweepingorvacuumsweeping.Theownerisresponsiblefortherepairofallruts,deformation,and/orbrokenpavingunits.TEXTOFINSTRUCTIONSFORVEGETATEDPERMEABLEPAVEMENTYourpropertycontainsastormwatermanagementflowcontrolBMP(bestmanagementpractice)called“grassedmodulargridpavement,’whichwasinstalledtominimizethestormwaterquantityandqualityimpactsofsomeorallofthepavedsurfacesonyourproperty.Grassedmodulargridpavementhastherunoffcharacteristicsofalawnwhileprovidingtheweight-bearingcapacityofconcretepavement.Thegrassedsurfacenotonlyminimizesrunoffquantity,ithelpstofilterpollutantsgeneratingbyvehicularuseofthesurface.ThecompositionandareaofgrassedmodulargridpavementasdepictedbytheflowcontrolBMPsiteplananddesigndetailsmustbemaintainedandmaynotbechangedwithoutwrittenapprovaleitherfromtheKingCountyWaterandLandResourcesDivisionorthroughafuturedevelopmentpermitfromKingCounty.Grassedmodulargridpavementmustbeinspectedafteronemajorstormeachyeartomakesureitisworkingproperly.Prolongedpondingorstandingwateronthepavementsurfaceisasignthatthesystemdefectiveandmayneedtobereplaced.Ifthisoccurs,contactthepavementinstallerortheKingCountyWaterandLandResourcesDivisionforfurtherinstructions.Thegrassedsurfaceofthepavementmustberegularlymowedandmaintainedinagoodcondition.Barespotsmustbereplantedinthespringorfall,2009SurfaceWaterDesignManual—AppendixC1/9/2009C-67190pjc I11.0CoNCLUSIONIBasedontheinformationprovidedabove,theproposedimprovementswillmeetthedrainagerequirementsfortheCityofRenton.IAHOL,Inc.IJeniferM.Kelly,PEProjectEngineerIFebruary2012RevisedMay2012IQ:\2010\210515\WORDPRQC\Reports\20120521_Rpt_(TIR)_210515.10docxIIIITechnicalInformationReportRentonEarlyChildhoodLearningCenter11-1000! rrrFII.11JrsGe!TAcaMA2215Nert35thStreetSuite300Tucama,WA50403-3135253.3032422ilL253.303.2572rutwww.alabIcornSEATTLE12006thAvenueSuite1520Seattle,WA90101-3123256.267.2425rEv205.267.2429rvx