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Home My WebLink AboutTIR-3880Frn.’rcWi—ooSloa..STORMDRAINAGEDRAINAGEREPORTFORCITYOFRENTON521PARKAVE.N,RENTON,WA98057CLIENT:D+BGROUP,5100SEHARNEYDR.PORTLAND,OR97206ArrN:DONSNAIR,PROJ.MGR,503.232.1974X102,don@dandbgroup.comPREPAREDBYWR&ASSOCIATES106MONTEREYDRIVENE,RENTON,WA98056VOICE:425.277.5664GWALKENl;GMA1L.COMFAX:1.206.569.00119J2iJ20512.18.15REVISEDPERCITYOFRENTONREVIEWCOMMENTS1.14.16REVISEDPERCITYOFRENTONREVIEWCOMMENTS TABLEOFCONTENTSSECTIONI-PROJECTOVERVIEWSECTION2-CONDITIONSANDREOUIREMENTSSUMMARY8SECTION3-OFFSITEANALYSIS9COREREQUIREMENT#1,DischargeatNaturalLocationCOREREQUIREMENT#2,OffsiteAnalysisSECTION4-FLOWCONTROL&WATEROUALITYFACILITYANALYSIS10&DESIGNCOREREQUIREMENT#3,FlowControlCOREREQUIREMENT#8,WaterQualitySECTION5-CONVEYANCESYSTEMANALYISANDDESIGN15COREREQUIREMENT#4,ConveyanceSystemSECTION6-SPECIALREPORTSANDSTUDIES18SITESOILSREPORT,APPENDIXCSECTION7—OTHERPERMITS18SECTION8-ESCANALYSISANDDESIGN19COREREQUIREMENT#5,TemporaryErosion&SedimentControlSECTION9-BONDqUANTITIES.FACITLITYSUMMARY&DECLARATON20OFCOVENANTCOREREQUIREMENT#7,FinancialGuarantees&LiabilitySECTION10-OPERATIONSA}JDMAINTENANCEMANUAL34COREREQUIREMENT#6,Maintenance&OperationsSECTION11-SPECIALREOUIREMENTS1-543APPENDIXA-KCRTSPREDEV44APPENDIXB-KCRTSDEVELOPEDAPPENDIXCKCRTSWATEROUALITY49 1of50TIRSECTION1PROJECTOVERVIEW:THISPROJECTREQUIRESAFULLDRAINAGEREVIEW.PERP.1-11OFCORAMENDMENTSOMEOFTHECOREANDSPECIALREQUIRMENTSHAVEEXEMPTIONSORTHRESHHOLDSTHATMAYPRECLUDEORLIMITTHEIRAPPLICATIONONASPECIFICPROJECT.ANYAPPLICATIONOFTHETHRESHOLDOREXEMPTIONSWILLBENOTED.Thefollowingdrainagereportisrequiredalongwithutilitydrawingsforthisproject.TheproposedprojectcombinestwoexistinglotsonthewestsideofParkAveN.Theaddressofthetwolotsare521and525ParkAve.Nandeachhasasmall,oldersinglefamilyhomethatwillberemovedinaccordancewithademolitionpLan.Thetotalareaofthecombinedlotsisapproximately10,191SF(95’N-Sby107.3’E-W.TopographyoftheexistingsiteisshownonanALTAsurveybyGeo-DimensionsinJune2014.Afterdemolitionaproposeddentalofficewitharoof/awningareaof4,220SFwillbeconstructed.Theremainderofthesitewillbeparking,drivewayandlandscaping.ThisprojectrequireddedicationtotheCitybytheownerof9.5’onParkAveNand2’onthewestsideofthelottoexpandthealleyROW.Seearchitectssiteplanforexactlocationonthesiteoflandscapingsidewalks,striping,paving,etc.TIRWORKSHEETANDSITELOCATION/DRAINAGEMAPAREBELOW.SEESOILSREPORTFORSOILINFORMATIONOFSITEANDSURROUNDINGAREA. 2of50CityofRentonPrintmapTemplateNotesLegendNoneCityandCountyBoundaryOtherrI0Parcels—PipeSITELOCATION&DRAINAGEeCulvertPIPEMAPPrivatePipe—I 2720136272FeetPrivateCulvertIVGS_1984_Web_Mercator_AuxilIary_Sphere•InrormationTechnology-GISThramapisauscrgencmtcdstaticoutputfromanInternetmappingsiteandCityofie_aiiTttiisforreferenceonty.Datalayersthatappearonthismapmayormaynotbe—aaiLjh1RentonMapSupport@Rentonwa.govaccurate,current,orothe,w’sereliableFinance&ITDivision1/14/2016THISMAPISNOTTOBEUSEDFORNAVIGATION 3of50KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart2PROJECTLOCATIONANDDESCRIPTION_____ ____ ____ ___ProjectName44y___ ____ _ ____ _ ____ _DOESPermit#LocationTownshipLi1stRangeSe ction __ ___ __ ___ __ ___ __ _SiteAddressLI/6L6941*gve.Wk/APart4OTHERREVIEWSANDPERMITSUDFWHPAUShorelineUCOE404ManagementUDOEDamSafetyUStructuralRockeryNaulVUFEMAFloodplainUESASection7UCOEWetlandsUOther__ _____ _TechnicalInformationReport—SiteImprovementPlan(Engr.Plans)TypeofDrainageReviewcEUjJ?/Targeted/Type(circleone):IModified/(circle):LargeSiteSmallSiteDate(includerevisionqSDate(includerevisiongt11(‘5(Z.dates):/,ic,IL,“dates):ç,,çii...DateofFinal:DateofFinal:Part6ADJUSTMENTAPPROVALSType(circleone):StandardIComplexIPreapplication/EmenlBlanketDescription:(includeconditionsinTIRSection2)itpv.—c4-/-/qtppjgf’I4t4fl3k...eUZ-tLaa...L.ohJADateofApproval:Part1PROJECTOWNERANDPROJECTENGINEERPr oje c t Owner _____ ____ ____ ___Phone_____________________Address_____ __ _ __ _ __ ___ ___ __ProjectEngineer4.çiaidW.(ha_riCompany#Phone4Z.tfl._cC4%Part3TYPEOFPERMITAPPLICATIONULanduseServicesSubdivisonIShortSubd./UPDUBuildingServicesMIFICommehoalISFRUClearingandGradingURight-of-WayUseUOtherPart5PLANANDREPORTINFORMATION2009SurfaceWaterDesignManualI1/9/2009 I4of50KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart7MONITORINGREQUIREMENTSMonitoringRequired:Yes/NoDescribe:_____________________________________StartDate:__________________________________________________________________CompletionDate:_________________________Part8SITECOMMUNITYANDDRAINAGEBASINCommunityPlanSpecialDistrictOverlays:DrainageBasinStormwaterRequirements:Part9ONSITEANDADJACENTSENSITIVEAREASURiver/StreamUSteepSlopeULakeUErosionHazardUWetlandsULandslideHazardUClosedDepressionUCoalMineHazardUFloodplainUSeismicHazardUOtherUHabitatProtectionU________________Part10SOILSSoilTypeSlopesErosionPotential&b5Pt1een’(yLnsJ&Iio)L.tt5annythvStq’5atJUHighGroundwaterTable(within5feet)USoleSourceAquiferUOtherUSeeps/SpringsUAdditionalSheetsAttached2009SurfaceWaterDesignManual21/912009 5of50KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart11DRAINAGEDESIGNLIMITATIONSREFERENCELIMITATION!SITECONSTRAINTUCore2—OffsiteAnalysisUSensitivefCriticalAreasUSEPAUOther‘_____ _____ ___ ___ __UAdditionalSheetsAttachedPart12TIRSUMMARYSHEET(provideoneTIRSummarySheetperThresholdDischarpeArea)ThresholdDischargeArea:(nameordescription)CoreRequirements(all8apply)DischargeatNaturalLocationNumberofNaturalDischargeLocations:‘j(OffsiteAnalysisLevel:1I2I3dated:____________________9-eq’C.—41uktJ.’4fltd4tSyg/&ti’adeqan1oFlowControlLevel:II2I3orExemptionNumberV(md.facilitysummarysheet)SmallSiteBMPs40.1—cCiitc-veaceConveyanceSystemSpillcontainmentlocatedat:ErosionandSedimentControlESCSiteSupervisor:rContactPhone:/,(3PAfterHoursPhone:MaintenanceandOperationResponsibility:trii/PublicIfPrivate,MaintenanceLogRequired:YesFinancialGuaranteesandProvided:J/NoLiabilityWaterQualityType:Basic/Sens.LakeIEnhancedBasicm/Bog(includefacilitysummarysheet)orExemptionNo.sroR—LandscapeManagementPlan:YesI(FJE)ftLSpecialRequirements(asapplicable)AreaSpecificDrainageType:CDAISDO/MDP/BPILMP/SharedFac./NoneRequirementsName:Floodplain/FloodwayDelineationType:MajorIMinor/Exemption/None100-yearBaseFloodElevation(orrange):Datum:FloodProtectionFacilitiesDescribe:SourceControlDescribelanduse:(comm/industriallanduse)Descnbeanystructuralcontrols:2009SurfaceWaterDesignManual1/9/20093 6of50KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETOilControlHigh-useSite:YesTreatmentBMP:MaintenanceAgreement:Yes/Nowithwhom?OtherDraInageStructuresDescribe:Part13EROSIONANDSEDIMENTCONTROLREQUIREMENTSMINIMUMESCREQUIREMENTSMINIMUMESCREQUIREMENTSDURINGCONSTRUCTIONAFTERCONSTRUCTIONClearingLimitsLIStabilizeExposedSurfacesLICoverMeasuresLIRemoveandRestoreTemporaryESCFacilities14PerimeterProtectioniSCleanandRemoveAllSiltandDebris,EnsureETrafficAreaStabilizationOperationofPermanentFacilitiesLISedimentRetentionLIFlagLimitsofSAOandopenspacepreservationareasLISurfaceWaterCollectionOtherLIDewateringControlLIDustControlLIFlowControl—Part14STORMWATERFACILITYDESCRIPTIONS(Note:IncludeFacilitySummaryandSketch)FlowControlType/Description—WaterQualityType/DescriptionLIDetentionLIBiofiltrationWInfiltrationLIWetpoolLIRegionalFacilityMediaFiltrationLISharedFacilityLIOilControlLIFlowControlLISpillControlBMPSLIFlowControlBMPsLIOtherLIOther2009SurfaceWaterDesignManual1/9/2009 7ofSOKINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETUDrainageEasementCovenantUNativeGrowthProtectionCovenantUTractUOtherUCastinPlaceVaultURetainingWallURockery>4HighUStructuralonSteepSlopeUOtherPart17SIGNATUREOFPROFESSIONALENGINEERI,oracivilengineerundermysupervision,havevisitedthesite.ActualsiteconditionsasobservedwereincorporatedintothisworksheetandtheattachedTechnicalInformationReport.Tothebestofmyaccurate.///4Part15EASEMENTS/TRACTSPart16STRUCTURALANALYSISSfltate2009SurfaceWaterDesignManualS1/9/2009 8of50TIRSECTION2CONDITIONSANDREOUIREMENTSSUMMARY:ApresettlingvaultorbasinisrequiredpriortoaSTORMFILTERwaterqualityvault.However,duetospacelimitationsonthissmallsiteawaiverletterhasbeenprepared.ThewaiverrequestletterisinTIRSection4. 9DI50TIRSECTION3OFFSITEANALYSIS:Runofffromtheexistingsitesheetflowswesttoanasphaltalleywhenitflowsnorthintoacatchbasininthealley.Fromthereitflowsabout350’throughprivatepropertyin12”to8”to10”pipesuntilitconnectsintoaType1CBonthesouthsideofN.6thAve.Itthenflowsnorthina10”concretepipeabout40’whereitthenconnectstoa24”CMP(approximately150’westofthecenter-lineofParkAveN).Wewillcallthisconnection“JunctionA”.This24”stormdrainsystemflowwestabout2300inN.6thStuntilitoutfallsintotheCedarRiver.TheCityhasdirectedustoconnectourstormsystemtoanexistingTypeICBonthewestcurbofParkAveN.FromthisCBrunoffflowsthrougha12”stormsystem,430’toaType2CBontheeastsideofParkAve.N.Fromhereourrunoffwillflow190’throughthe24”stormdrainto“JunctionA”.Itiscommondrainagelawtoconsiderdischargetobeinitsnaturallocationifthesystemsreconnectwithin¼mile.Our620’viathelongestroute(ParkAveN.and6th)meetsthatcriteria.PLEASESEESITELOCATION/DRAINAGEMAPINTIRSECTION1FORprintoutoftheCity’sstormdrainagesystemintheprojectareathatshowstheabovedescribedpipingsystem.BasedonthedescriptionoftheexistingstormdrainsystemfromoursitetotheCedarRiverasdescribedabovetheexistingdrainagesystemisadequate.AproposedprojectisexemptfromCoreRequirement#2ifanyoneofthefollowingistrue:1.RDSDtogetherwiththeCityofRentonSurfaceWaterUtilitydeterminethereissufficientinformationforthemtoconcludethattheproposedprojectwillnothavesignificantadverseimpactonthedownstreamandlorupstreamdrainagesystem. lOaf50TIRSECTION4FLOWCONTROLANDWATEROUALITYFACILITYANALYSIS&DESIGN:FLOWCONTROLANALYSISANDDESIGN:PerPre-applicationmemoweareintheaPeakRateFlowControlStandardarea.Thetargetedsurfacesthatapplytothisprojectistheentiredevelopedsitearea,10,191SF(0.231acres).FromtheCORamendmentto2009KCSWDM,ThefollowingexceptionsapplyonlyinPeakRateFlowControlStandardAreas:1.ThefacilityrequirementinPeakRateFlowControlStandardAreasiswaivedforanythresholddischargeareainwhichthetargetsurfacessubjecttothisrequirementwillgeneratenomorethanaO.1-cfsincreaseintheexistingsiteconditions100-yearpeakflow.Note:forthepurposesofthiscalculation,targetsurfacesservedbyflowcontrolBMFsperAppendixCmaybemodeledinaccordancewiththeflowcontrolBMPfacili4’sizingcreditsinTableI.2.3.C.1-42).Theexistingsiteconditions100-year,15’timesteppeakflowis0.176CFSperKCRTSasdocumentedinAppendixAwhichcontainsFig.No.1fortheexistingsiteconditionsandtheKCRTSoutput.Asnotedabovethecalculationofthe0.1cfsmaximumincreaseallowsforsizingcredits.Thefuturesiteconditions100-year,15’timesteppeakflowis0.262CFSperKCRTSasdocumentedinAppendixBwhichcontainsFig.No.2forthefuturesiteconditionsandtheKCRTSoutput.Thesitesoilsvaryfromsandwithfinestogravellysandwhichinfiltratesevenbetterthanfinesand/loamysandperthesitegeo-technicalreport.Therefore,wehavemodeledthe4,220sfroofareaat50%impervious/50%grassusingKCRTSandthisresultsina100-yeardevelopedpeakflowof0.262CFSasdocumentedinAppendixB.Theincreaseof0.086cfsduringa100-yrstormislessthan0.10cfsandthuswemeetthedetentionexemption.TABLE5.2.2.AFLOWCONTROLBMPFACILITYSIZINGCREDITS(1)(KCSWDM)FlowControlBMPTypeFacilitySizingCreditFulldispersionModelthilydispersedsurfaceasforest(2)Fullinfiltration(3)SubtractimperviousareathatisfullyinfiltratedLimitedinfiltrationModeltributaryimpervioussurfaceas50%impervious,50%grass<===From2009KCSWDM,AppendixCC.2.3.4USEOFDRYWELLSFORLIMITEDINFILTRATIONThespecificationsforuseofdrywellsforlimitedinfiltrationarethesameasthoseusedforfullinfiltration,exceptthatevery1,000squarefeetofthbutaiyimpervioussurfacerequiresdifferentgravelvolumesasfollows:(a)230cubicfeetifthesoilisafinesandlloamysand,<=====seep.4sitegeo-techreportBELOW(b)380cubicfeetifthesoilisasandyloam,or(c)570cubicfeetifthesoilisaloam.Wehaveselectedadrywelltoinfiltratetheroofrunoff(MODIFIEDDRYWELLINFILTRATIONSYSTEM,P.C-432009KCSWDM).Thesitesoilsrequire230CFofdiywellvolumeper1,000SFofroofareaforatotalvolumeof970CF.Thegeotechnicalreport(p.4)estimatestheseasonalgroundwatervariesfrom8’to15’orapproximatelyelevation17to24.Wesetthebottomofthedrywellatelevation26.SeelocationanddclailsonplanshtC-2. 11of50PleaseseePERWOUS/IMPERVIOUSAREACALCULATIONSinAppendixAbeforeFig.No.IWATEROUALIflANALYSISANDDESIGN:NewPollutionGeneratingImperviousSurface(PGIS)fortheproposedsiteincludingrun-on(fromsidewalks)is5,600SF(SEEBREAKDOWNBELOW).BECASUEThEPGISEXCEEDS5,000SFthereisnoexemptionforthissitetoawaterqualityfacilityPEREXEMPTIONCRITERIA,P.1-6)OFCORADDENDUM.TOTALLOTAREATOBEDEVELOPED=10,191SFEXCLUDE:5LANSCAPEAREASALONGN.&E.SIDEBLDG.SEEFIG.NO.2(SEEAPPENDIXB)-1,049SFEXCLUDE:2ENTRYSWALKSTHATFLOWTOPARKAVE.-102SFEXCLUDE:AREABORDEREDBYOUTSIDEOFBLDGWALLS-3,443SFNEWPGISFORSITETh1CLUDNGRUN-ONFROMSWALKS5,597SF<Fordevelopedsiteconditionsthe2-year,15’timesteppeakflowis0.061CFSperKCRTSasdocumentedinAppendixC.ThesmallsitelimitschoicesforwaterqualitytoaSTORMHLTER.Fromp.6-134of2009KCSWDMStormFilterwithZPGMediaforBasicWaterQualityTreatment1.Themaximumflowrate(gpm/carthdge)isbasedontheeffectivecartridgeheight.ThemaximumflowratepercartridgeshallbeperTable6.5.5.A(below).Themaximumspecificflowrateis1gpmlftz.2.Thewaterqualitydesignflowshallbeasfollows,whicheverisapplicable:Precedingdetention(ornodetention):35%ofthedevelopedtwo-yearpeakflowrate,asdeterminedusingtheKCRTSmodelwith15-minutetimestepscalibratedtositeconditions.3635%ofthedevelopedtwo-yearpeakflowrateis0.0217cfs.PeremailfromMichaelMacnoskey,P.EwithContechEngineeredSolutionsLLC”AttachedarepdfandACADfilesforasinglecarthdgeCBStormFilter.Foryour0.0217cfswaterqualityflowrateyouwillneeda27”tallZPGStormFiltercartridge.”DetailsforthewaterqualityvaultarconshtC-6.PresettlingisrequiredpriortotheSTORMFILTER.However,thesiteistoosmalltoaccommodatepresettlingchoicesexceptforabelowgradeconcretevault.However,the2009KCSWDM,SECTION6.5.5STORMFILTERstatesinpart...AnadjustmentwithoutprescttlingmaybeconsideredonanexperimentalbasisfordrainagebasinslessthanV2acreofimperviousarea.PleaseseeBELOWforletterrequestingawaivertothepresettlingrequirement. 12of50WR&ASSOCIATES106MONTEREYDRIVENE,RENTON,WA98056VOICE:425.277.5664GWALKEN(WGMAIL.COMJanuaryN,2016BriannaBannwarth,DevelopmentEngineeringManager1055S.GradyWayRenton,WA98057Re:R1B15007908,MyDentalDearMs.Bannwarth:Thepurposeofthisletteristorequestawaiverfromtherequirementtoprovidepresettlingfortheproposedwaterqualityvault.Thesiteissmallat10,200SF.Theproposeddentalofficeismodestat4,600SF.Theremaining5,600SFisusedupbycoderequiredparking,landscapingandwalkways.Thereisnoroomforanywaterqualityfacilityexceptamediafiltrationsystem.TheonlyapprovedsystemisaSTORMFILTER.FromSection6.5.5of2009KCSWDMPresettlingisrequiredaheadofaSTORMFILTER.Thisrequirementmaybemetbyanyofthefollowing:1.AwaterqualityfacilityfromtheBasicWQMenu(seeSection6.1.1forfacilityoptions).OPTIONSAREBIOSWALE,FILTERSTRIP,WETPOND,WEWAULT,STORMWATERWETLAND,COMBINEDDETENTION/WETPONDANDSANDFILTER.2.Apreseuithgpondorvault,whichmaybeintegratedasthefirstcellofthefiltrationfacility,withatreatmentvolumeequalto0.75timestherunofffromthemeanannualstorm(164CE).Noneoftheaboveoptionsarefeasiblebecauseoflimitedsiteareaorhighcostforaburiedconcretevault.Section6.5.5allowsfor“anadjustmentwithoutpresettingmaybeconsideredonanexperimentalbasisfordrainagebasinslessthan½acreofimperviousarea”.Ourtributaryareaat5,600SFis5600/21780(1½acre)or26%ofthe½acrelimit.ForthereasonsstatedaboveIamrequestingthatyougrantawavierforthepresettlingrequirementforthisproject.Sincerely,a”GeraldWalken,P.E.cc:AnnFowler,CityofRentonDonSnair,ProjectManager ‘LOTS.521PARKAVEN.IIMPERVIOUSAREAsAED211CONCRETE190[GRAVELDWY-1209—JOTALIMPERIOUSAREA2060_JOTALPERVIOUSAREA2768TOtALLOTAREA4828LOT7.525PARKAVEN.IMPERVIOUSAREASHED-HOUSE-790LA”DWY547TOTALIMPERIOUSAREA1949TOTALPERVIOUSAREA34i4TOTALLOTAREA5363:13ci50SheetiMYDENTALSITE,RENTONPARKAVSEEALTASURVEY&FIGURENO.1,EXISTINGGROUNDCOVER(‘SEEAPPENDIXA)I——-$9.FEET+59.FEETI+- -ILOTS6&7ARECOMBINEDFORThISPROJECTAREAS,ACRESCOMBiNEDEXISTINGIMPERVIOUSAREA!—40090.092rCOMBINEDLOTAREAS-101910.234rCOMBINEDEX.PEAViOusAREA6182jFIGURENO2,PROPOSEDGROUNDCOVER(SEEAPPENDIXB)ROOFAREAPHALTDWYCONCRETEWALKWAYSPERVIOUSAREA,(LS.NOTUNDERROOF)JOTALAREAJ-+4220:±479p399+6714—PERVIOUSIMPERVACRESACRES0.0970.04840.0484°“qf—0.110.--0.0090.0150.0150.2340.06340.1674IMPERVIOUSIPERVIOUSAREACALCULTIONS_ ___ _ __ _ ____ _ ______ _ _____ _ _ _____ _ _ -—-..IPage1 14of50sandandgravelfluvialdepositfromtheCedarRiver.UnderlyingthesandandgraveldepositsareUpperPleistosceneVashonGlacialDriftdeposits.TheareawasinvadedbyglacialiceatleastthreetimesduringthePleistoceneEpoch,about1.6millionto10,000yearsago.3.4SurfaceandGroundWaterConditionsWedidnotobservesurfacewaterduringoursiteinvestigationsonJune20andJuly7,2014.Weencounteredgroundwatertableatdepthof10’.Weinterprateconstantgroundwatertableisat(liedepthof15’fromsoilcolorandfluctuatebetween8’to15’year-round.1-Jowever,shallowstormwatermayflownearthesurfaceduringwinterwetseasonasindicatedfromthesoilmottling.4.LABORATORYTESTSANDINFILTRATIONFordetenninhgsoilhilMtrationattheshallowdepth,alaboratorytestwasperformedonshallownearsurfacesoilsamplecollectedduringtestboringsJuly7,2014.Thetestwasaimedatestimatingsoilinfiltrationforon-sitestormwatersystemdesign.0SieveAnalysis:Usedtoassessparticlesizedistributionofagranularmaterial.ThesievetestresultispresentedinFigure8.ThesoilwasthenclassifiedusingbothUSDAandASTMmethods.Weconclude,anditisouropinionthatalongtermrateforthesiteof0.5-1.0inches/hourisacceptablefordesignpurposesbasedonourdatabaseandexperienceandknowledgeforthistypeofsoilinthearea,5.CONCLUSIONSANDRECOMMENDATIONSWeconclude,basedonthisinvestigation,thatthesiteissuitablefortheproposedprojectiftherecommendationsinthisreportarefollowed.Weunderstandthatcurrentplansfortheproposedbuildingcallforashallowspreadfootingfoundation.£1SitePreparationandGradingWerecommendremovinganytoporganicsoil,uncontrolledfills,andunsuitablelooseandsoftfIei’ltEngineertugInc.-4- 15of50TIRSECTIONSCONVEYANCESYSTEMANALYSISANDDESIGN:Theconveyancesystemhasbeensizedtohandlea100-yrrainfallevent.Pipematerials,catchbasins,yarddrains,etc.meetCityofRentonstandards.AnewType1catchbasinwillbeinstalledinthewestcurblinearoundanexisting12”SDtocollectrunofffromthesite.2009KCSWDRECOMMENDSTHERATIONALMETHODFORSIZINGNEWCONVEYANCESYSTEMSTHATDRAINSMAlL(<10acres).USINGTHERATIONALMETHODFOROURSITEWEHAVEASFOLLOWS:(NOTE:REFERENCESEC3.2.1OF2009KCSWDM.WEHAVECONSERVATIVLYMODELEDTHEENTIRESITEASIMPERWOHJSEVENTHOUGHTHEREISSOMELANDSCAPINGONEASTANDNORTHSIDEOFDEVELOPEDSITE.Qioo=C*I100.AWFIEREC=0.90,A0.234ACRES(10,200SF)1100=P100*IWHEREIISAFUNCTIONOFTIMEOFCONCENTRATION(CONSERVATIVELYASSUMEDAT6.3MINUTES)=(aioo)*(6.31_)=(2.6fl(6.3)&0630820.8181100=(Pioo)*(ii)=3.9*0.818=3.19Qioo=C*1100.A=0.90*3.19*.234=0.67cfsTHEROOFAi{EAOF4,220SFIS41.4%OFTHESITESOWEATTRIBUTE41%OFTHE0.67cfs100YR.PEAKFLOWTOTHEROOFOR0.28CFS.AMAXIMUMOF75%OR0.21CFSISTRIBUTRYTOTHE130’LONG,4”PVCROOFTIGHTLINEALONGTHENORTHANDWESTSIDEOFTHEBUILDING.THEMAXIMUMDESIGNWATERLEVELINTHEDRYWELLISELEV.29.0(NOTE:THISISAFTERWELOWERTHEBOTTOMOFTHEWETWELL1’ASSHOWNONREVISEDDETAILONSHT.0.2).WITHTHE4”TIGHTLINECOMPLETELYFULLTHEHEADLOSSFROMDOWNSPOUTATNECORNEROFBUILDINGTOTHEDRYWELLIS3.5’(32.5toppipe-29.0max.designwaterlevelonthywell).HYDRAULICSLOPEIS3.5’/130’OR2.7%.WITHAPIPESLOPEOF2%THETIGHTLINEWILLCARRY0.31CFSVS.THE0.21CFSFORTHE100YRSTORM.SEEFIGUREINAPPENDIX(NOTE:FROMENGINEERSTOOBOX,PolyvinylChloridePVC-withsmoothinnerwalls00090011MANNINGSNVALUE.-[NTHEUNLIKELYEVENTOFANOVERFLOWFROMTHEDRYWELL.THEPROPOSED8”DIAPIPEWILLNEEDTOCARRYTHEENTIRE0.67CFS,100YR.FLOW(ASCALCULATEDABOVE).THEPROPOSED8”PVCPIPEAT1%WILLCARRY1.42CFSOR2TIMESPEAK100YR.FLOW. 1114/2016FreeOnlineManningPipeFlowCalculatar16cr50FreeOnlineManningPipeFlowCalculatorListofCalculators‘draulicsLarweManningFormulaUniformPipeFlowatGivenSlopeandDepthCanyouhelpmetranslatethiscalculatortoyourlanguageorhostthiscalculatoratyourwebsite?4”PVCROOFDRAINTIGHTLINEPROPOSEDMYDENTALONPARKAVEN.ResultsFlow,q0.3180cfsvVelocity,v3.6447ft/secSetunits:mmmftinchesVelocityhead,h2.4774inches4Pipediameter,d0.Flowarea12.5664sq.in.InchesvManningroughness,n2.011Welledperimeter12.5664inchesPressureslope(possibly2equaltopipe2Hydraulicradius1.0000inchesvslope),Sj%riseimnTopwidth,T0.0000inchesPercentot(orratioto)fulldepth(100%100Froudenumber,0.00or1ifflowingfull)FShearstress(tractiveforce),19.9258N/mA2tauPleasegiveusyourvaluedwordsofsuggestionorpraise.Didthisfreecalculatorexceedyourexpectationsineveryway?HomeSupportIFreeSoftwareDocumentsIBIba(newin2009)EngineeringServicesIEngineeringCalculatorsITechnicalIPersonalessayspCollaborativeFamilyTreesIContacthllp:/www.hwsedc.com/engcaks/Mannhig-Pipe-Flcw.php1/1 17cr501/15/2016FreeOnflneMainingPipeFlawCalculatorFreeOnlineManningPipeFlowCalculatorListofCalculatorsHydraulicsLanquaqeManningFormulaUniformPipeFlowatGivenSlopeandDepthCanyouhelpmetranslatethiscalculatortoyourlanguageorhostthiscalculatoratyourwebsite?8”PvcFROMCB#3THRUSTORMFILTERTO1211SDINPARKAVEN,MYDENTALResultsFlow,q1.4280cfsvSetunits:mmmftinchesVelocity,v4.0910ftlsecvVelocityhead,h3.1214inches8Pipediameter,d0inchesFlowarea50.2656sq.in.vManningroughness,n2.011Wettedperimeter25.1327inchesPressureslope(possibly2equaltopipe1Hydraulicradius2.0000inchesvslope),5o%rise/mnTopwidth,T0.0000inchesPercentof(orratioto)fulldepth(100%100Froudenumber,0.00orIifflowingfull)vFShearstress(tractiveforce),19.9258N/mA2tauPleasegiveusyourvaluedwordsofsuggestionorpraise.Didthisfreecalculatorexceedyourexpectationsineveryway?HomejSupportFreeSoftwareEnnineeringServicesIEngineeringCalculatorsITechnicalDocumentsIBlog(newin2009)1PersonalessaysICollaborativeFamilyTreesIContacthttp:thcww.hawsedc.com/engcalcs/Manning-PIpe.Flow.php1/I 18of50TIRSECTION6SPECIALREPORTSANDSTUDIES:Nonerequired.TIRSECTION7OTHERPREMITS:Nonerequired. 19of50TillSECTION8CSWPPPANALYSISANflDESIGN:ESCPLAN:Thesiteisalmostflatvaryingfrom32.8neartheSEcornerofthesiteto32.4neartheNWcornerofthesite.Runoffflowswesterlyandthennortherlyinanasphaltalleytoacatchbasin.Constructionaccesswillbeviatheexisting12pavedalleyandaconstructionentrancewillbelocatedintheSWcornerofthesite.130IfofsiltfencewillbeinstalledfromthenorthsideoftheconstructionentrancenorthtotheNWcornerofsiteandtheneasterlytotheexistingbuildingonthenorthpropertyline.Orangeclearingfencedwillbeplacedonthesouthproperlyline.Nosiltfenceisneededhereasthegroundgoesupslightlyfromthesouthpropertyline.CatchbasinprotectionshallbeinstalledonexistingcatchbasinsinthealleyandonwestcurblineofParkAve.N.Catchbasinprotectionshallinstalledonallnewcatchbasinsastheyareinstalledperthesitestormwaterplan.ThelocationofthesefacilitiesanddetailsareshownontheTESCplan.SWPPSPLAN:TheroofistributarytoadrywellandisnotconsideredPGIS.ThepollutiongeneratingsurfaceistheparkinglotandallparkinglotrunoffisdirectedtoaSTORMFILTER. 20of50TIRSECTION9BONDOUANTITIES.FACILITYSUMMARIESANDDECLARATIONOFCONVENANT:Maintenanceoftheflowcontrolfacilitieswillbeprovidedinaccordancewithcoderequirements.ADeclarationofCovenantforMaintenanceandInspectionofFlowControlBMP’sfollowsfortheroofDrywellandtheSTORMFILTER. -D(aCD—%—_0MLñWoo1CDI.,nbJt‘iirIS.(na1°m•RanaCi)CD—w—10)-o—aC—23Cwc,ZCaCD—n0(31b00(I)00—.0CD9CDa—P.it,aBo-zrn—xS0DCmrn022-SCD3CDDr103___ ___ ____ _0D0t—a.-I——00-I,ooat—‘DCi,a2)—o—D—C,D2)—CD—.5Srn—0CDrrn7c--‘—CD0CDCD00oa-I-.CDtSS-‘-.N)a)a)DccN)a)(iia0)ap0—SaCDCD000aSC” 22 of 50 S15 Web date:04103/2015SiteImprovementBondQuantityWorksheet Unit Reference #Price Unit Quantity Applications Cost EROSIONISEDIMENT CONTROL Number Backfill &compaction-embankment ESC-1 $6.00 CY Check dams,4”minus rock ESC-2 SWUM 5.4.6.3 $80.00 Each Crushed surfacing 1 114”minus ESC-3 WSDOT9-03.9(3)$95.00 CV Ditching ESC-4 $9.00 CV Excavation-bulk ESC-5 $2.00 CV Fence,silt ESC-6 SWUM 54.3.1 $1.50 LF 132 1 198 Fence,Temporary (NGPE)ESC-7 $1.50 LF 107 1 101 Hydroseeding ESC-8 SWDM 5.4.2.4 $0.80 SY Jute Mesh ESC-9 SWUM 5.4.2.2 $3.50 SY Mulch,by hand,straw,3”deep ESC-1O SWUM 5.4.2.1 $2.50 SY Mulch,by machine,straw,2”deep ESC-11 SWUM 5.4.2.1 $2.00 SY Piping,temporary,CPP,6”ESC-12 $12.00 LF Piping,temporary,CPP,8”ESC-13 $14.00 LF Piping,temporary,CPP,12”ESC-14 $18.00 LF Plastic covering,6mm thick,sandbagged ESC-15 SWUM 5.4.2.3 $4.00 SY 100 1 400 Rip Rap,machine placed;slopes ESC-16 WSDOT 9-13.1(2)$45.00 CV Rock Construction Entrance,50xlS’xl’ESC-17 SWUM 5.4.4.1 $1,800.00 Each 1 1 1800 Rock Construction Entrance,100’xlS’xl’ESC-18 SWUM 5.4.4.1 $3,200.00 Each Sediment pond riser assembly ESC-19 SWUM 5.4.5.2 $2,200.00 Each Sediment trap,5’high berm ESC-20 SWUM 5.4.5.1 $19.00 LF Sed.trap,5 high,dpmpped spillway berm section ESC-21 SWUM 5.4.5.1 $70.00 LF Seeding,by hand ESC-22 SWUM 5.4.2.4 $1.00 SY Sodding,1”deep,level ground ESC-23 SWUM 5.4.2.5 $8.00 SY Sodding,1”deep,sloped ground ESC-24 SWUM 5.4.2.5 $10.00 SY TESC Supervisor ESC-25 $110.00 HR Water truck,dust control ESC-26 SWUM 5.4.7 $140.00 HR WRITE-IN-ITEMS (see page 9) CATCH BASIN FILTER FABRIC PROTECTION $50.00 Each 7 1 350 Page 2 of 9 ESC SUBTOTAL: 30%CONTiNGENCY &MOBILIZATION: ESC TOTAL: COLUMN: $2,908.50 $872.55 $3,781.05 A Unit prices updated:3/2/2015 Version:3/2/2015 Report Date:0111 5/2016MYDENTALBOWSSHT1-9 C•0000(A•g<.goc.9.woow000-0(.3-COCMMN)N)N)N)0000)CMCMCD-‘CD3-C10CD3CDDrlw0a0CD-I0-,Cl)CDCD-<C-,00Z•-j-I>>r,r00O00•0a.00.C00=N)w0CM0a0a0CaF00(A -U0Co0-C0NC=CaNC‘C,0CCoCoo—CC.C0-C,0.C0CP(0CDB-C-I0CDBCDD0DaaC£1)r4-0-,CoCDCDCmzNCenCCCoC0-10CenenCCCD-CaaC,CoU,E<.aC.9LmooF!CCCC.JC.)-sCCUINNNNNCCCenenenC.a0CtCa0C.)N0U, 25of50SiteImprovementBondQuantityWorksheetWobdato:04/03/2015ExistingFuturePublicPrivateRight-of-wayRightofWayimprovements&_Drainage_FacilitiesUnitPriceUnitQuant.ICostQuant.CostQuantCostROADSURFACING(4”Rock=2.5base&15”tocourse)91/2”Rock8”base&1.5”topcourse)Additionai2.5”CrushedSurfacingRS-1$3,60SYHMA1/2”Overlay,1.5”RS-2$14.00SIHMA1/2”Overlay2”RS-3$18.00SI1482,664.00HMARoad,2”,4”rock,First2500SIRS-4$28.00SfHMARoad,2”,4”rock,Qty.over2500SRS-5$21.0051HMARoad,3,91/2”Rock,First2500SRS-6$35.00SfHMARoad,3”,91/2”Rock,QtyOver251RS-7$42.00SINotUsedRS-SNotUsedRS-9HMARoad,6”Depth,First2500SYRS-10$33.10SYHMARoad,6”Depth.Oty.Over25005’?RS-11$30.00SYHMA314”or1”,4”DepthRS-12$20.00SYGravelRoad,4”rock,First2500SYRS-1$15.00SYGravelRoad,4”rock,Oty.over250051RS-14$10.00SYPCCRoad(AddUnderWrite-Insw/OesigRS-11ThickenedEdgeRS-l7$8.60LFPagesof9SUBTOTAL2,664.00___________________Unitpricesupdated:03/02/2015“KCC27Aauthorizesonlyonebondreduction.Version:03/02/2015MYDENTALBOWSSHT1-9ReportDate:01/15/2016 a,CC00U,U,000009999900COLt)00U,Nr-.00CDNa0--aEa,’—I,.0a)—0)a)—LL.It=3.E.i.‘Ua,Ia)UCaUa)I,C04U,0N000a)Ca-o.0a)-I-aa)a)-C0I—0>4-a4-aCCuCVC04-Ca)S0)>2aS0)4-aU)0U)0CDNEn00CCaa)aEn00CI,a)aEn00CCaa)aCDa)U0-CDCaa,0-Caa,ECaU,U,00-oa)SCCa)Ea)EnEn-cia)Ea)EnEnCoEnCa3a)>000a,aSa)U,a,00ta)>a)04—0UCa)Caa)LU0Nza)a0-U=EnCa0-a)Ca0)0&0-0LU0z0NLOOM)—eIDNnm-rn-Cfl.C-C.C000000frUUUULi-Ii-U-Li-U-U-Li-U-ILU-U-ILU-ILLZLILU-U-U--JJ-J-JJ-JJ-J-JJJJ-i0000000000000000000000000000999999999999999990900000000000000U)0000000000U)00)thu—cicicici0U)0a,00’000U,0U,1-Or.NtN0U,1-00)P.-U,U)U,CW0),NrrNfl‘—NNN06,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6’6,66,6,6,6,6,6,6,6,ep.-0N0U,CDP.-=aoN0U,U,P.-0’0’0—LOU,a,0)NNNNNNNNNNOO000000U)U,U,—000NNNNNU,00—C,C’)—000worn0aU,a)-CaCDC0Ua)•0a)=0.00“H00Ngo-Ca,NW000>09U,aa,-Ja,0a0Coa)01Ca0--C0CaLU0N6,N00a)ICEn2Ca0a,>-009N600Ca0IEnEna)UU-CUCaLUNU,6,C,0a).0Ca0Ba)EnCa0a,VCCaa)BSa)V=0CEna,0a)0-Caa)VCaC00VCa0a)0Saa)-oCaC0VCa0a)a)BCaVa,a)Ha,0a)>0Saa)VCaC00VCa0a)a)BCa0a)F-a,0a)0S0a)CaC0=VVCa0a)a)BCa00Coa)aI-a,0a)a)BCaVNP.-Ja)Ha,00V<.03a)BCaU.!•S---0’,rr-rNflflCtP--2>>>dD0D9.s..C0-0-0-0000000000Ca)a)a)000Otttttttttttttta)CCCa)a)a)a)a)a)a)a)Caa)a)a)Wa)2CaCaCa>>>>>>>>>>>>H00000000000000000 27of50SiteImprovementBondQuantityWorksheetE,clstingFuturePublicPrivateRIght-of-wayRIghtofWayImprovementsDRAINAGECONTINUED&DrainageFacilitiesNo.UnitPriceUnitQuant.CostQuant.CastQuant.CostCulvert,Concrete,8”0-32$2500LFCulvert.Concrele,12”0-33$36.00LFCulvert,Concrele,15”0-34$42.00LFCulvert,Concrete.18”0-35$40.00IFCulvert,Concrete.24”D-36$78.00LFCulvert.Concrete.30”0-37$125.00LFCulvert,Concrete,36”0-38$150.00I.ECulvert,Concrele,42”0-395175.00IFCulvert,Concrete,48”0-413$205.00IFCulvert,CPP,6”0-41$14.00IFCulvert.CPP.8”0-42$16.00LFCulvert,CPP,12”0-43524.00IFCulvert.CPP,15”0-44$35.00IFCulvert,CPP,18”0-45$41.00IFCulvert,CPP,24”0-46$56.00IFCulvert.CPP,30”D-47$78.00LFCulvert,CPP,36”0-48$130.00LFDitching0-49S9.50CYFlawDispersalTrench(1.436base.)0-50528,00IFFrenchDrain(3’depth)0-51$26.00IFGeotextile,laidintrench.polypropylene0-52$3.00SYMid-tankAccessRiser,48’dia,6’deep0-54$2,000.00EachPondOverflowSpillway0-55$16.00SYRestnctor/OilSeparator,12”0-56$1,150.00EachResbictor/OilSeparator,15”0-57$1,350.00EachRestxictorloiiSeparator.18”0-58$1,700.00EachRiprap,placed0-59$42.00CVTankEndReducer(36”diameter)0-60$1,200.00EachTrashRack,12”0-61$350.00EachTrashRack.15”0-62$410.00EachTrashRack,18”0-63$480.00EachTrashRack,21”D-64$550.00EachPage7af9SUBTOTAL______________________________Unitpricesupdated:03/02/2015KCC27Aauthorizesonlyonebondreduction.Version:03/0212015MYDENTALBOWSSHT1-9ReportDate:01/15/2016 Web date:04/03/2015 28 of 50 Site Improvement Bond Quantity Worksheet UTILITY POLES &STREET LIGHTING Utility pole relocation costs must be accompanied by Franchise Utility’s Cost Estimate I up-i I Existing Future Public Private Right-of-way Right of Way Improvements &_Drainage_Facilities Unit Price Unit Quant.Price Quani.Cost Quant.Cost PARKING LOT SURFACING Not To Be Used For Roads Or Shoulders No. 2”AC,2”topcourserock&4”boaow PL-1 $21.00 SY NA NA 2 AC 1.5”top course &2,5”base cou PL -2 $28.00 SY NA NA 650 182pL 4 select bormw PL -3 $5.00 SY NA NA 1.5”top course rock &25”base course PL -4 $14.00 SY NA NA Utility Pole(s)Retocation Lump Sum I UP-2 I I Each WRITE-IN-ITEMS (Such as detenio&water quality vaults.)N2 1 CARTRIDGE STORMFILTER WI-i $8500.00 Each 1 8,500.00 3 HIvIA OVER EX.BASE.ALLEY Wl-2 $12.00 SY 145 1776 WI-3 CV WI-4 LF Wl-5 FT WI -6 WI -7 WI -8 WI -9 WI-10 Street Light Poles w/Luminaires 1.77600 SUBTOTAL (SUM ALL PAGES):11,526.00 30%CONTiNGENCY &MOBILIZAtON:3,457.80 GRANOTOTAL:14,983.80 COLUMN:B Unit prices updated:03/0212015 Version:03102/2015 Report Date:01/15/2016 SUBTOTAL Page 8 of 9 26,700.00 35045.00 11,413.60 C 0 49,458.50 KCC 27A authorizes only one bond reduction. MY DENTAL BOWS SHT 1-9 29of50Originalbandcomputationspreparedby:SiteImprovementBondQuantityWorksheetWebdate:04/03/2015Name:PERegistrationNumberFirmName:Mdmss:GERALDWALKEN16844WR&ASSOCIATES106MONTEREYDRNE,RENTON,WA98056Date:Tel.N:ProjectNo:12121/2015425.277.5664FINANCIALGUARANTEEREQUIREMENTSStabilization/ErosionSedimentControl(ESC)ExistingRight-of-WayImprovementsFuturePublicRightofWay&DrainageFacilitiesPrivateImprovementsCalculatedQuantityCompletedTotalRight-ofWayand/orSiteRestorationBond’/”(First$7,500ofbond’shallbecash.)PerformanceBondAmount(A+B+C+D)=TOTALPERFORMANCEBOND’AMOUNTMINIMUMBOND’AMOUNTREQUIREDFORRECORDINGORTEMPORARYOCCUPANCYATSUBSTANTIALCOMPLETIONPUBLICROAD&DRAINAGEMAINTENANCEIDEFECTBOND’$3,746.0Minimumis$2000.*NOTE:Theword‘band’asusedinthisdocumentmeansafinancialguaranteeacceptabletoKingCounty.“NOTE:KCC27Aauthorizesrightofwayandsiterestorationbandstobecombinedwhenbotharerequired.TherestorationrequirementshallincludethetotalcostforallTESCasaminimum,notamaximum.Inaddition,correctivework,bothon-andaft-siteneedstobeincluded.Quantitiesshallreflectworsecasescenariosnotjustminimumrequirements.Farexample,ifasalmonidstreammaybedamaged,someestimatedcostsforrestorationneedstobereflectedinthisamaunLThe30%contingencyandmobilizationcostsarecompuledinthisquantity.NOTE:PerKCC27A,totalbandamountsremainingafterreductionshallnotbelessthan30%oftheoriginalamountfr)orasrevisedbymajordesignchanges.REQUIREDBOND’AMOUNTSARESUBJECTTOREVIEWANDMODIFICATIONBYKINGCOUNTYPage9of9CheckouttheDDESWebsiteatwwwSingcounty.govfpermitsUnitpricesupdated:03/02/2015Version:03/02/2015ReportDate:01/15/2016(A)(B)(C)(0)(A+B)(T)$3,761.1$14,983.8S549,456.5518,764.9566,223.4Minimumis$2000.Maintenance/DefectBond’TotalNAMEOFPERSONPREPARINGBOND’REDUCTION:TxO.30$20,467.0Minimumis52000.(B+C)x0.25=Date:MYDENTALBQWSSHT1-9 30of50RECORDINGREQUESTEDBYANDWHENRECORDEDMAILTO:CITYCLERK’SOFFICECITYOFRENTON1055SOUTHGRADYWAYRENTON,WA98057DECLARATIONOFCOVENANTFORMAINTENANCEANDINSPECTIONOFFLOWCONTROLBMPS09LLCGrantor:_______________________________________________Grantee:CityofRentonLOT6&LOT7INBLK10OFRENTONFARMPLATASRECORDEDLegalDescription:INVOLUME10OFPLATS,P.97,RECORDSOFKINGCOUNTYAUDITORSITUATEDINCITYOFRENTON,COUNTYOFKING,STATEOFWASHINGTON.AdditionalLegal(s)on:LOT6=7224000850,LOT7=7224000855AssessorsTajcParcelID#:_________________________________________________________________INCONSIDERATIONoftheapprovedCityofRenton(checkoneofthefollowing)Uresidentialbuildingpermit,Ucommercialbuildingpermit,Uclearingandgradingpermit,Usubdivisionpermit,orUshortsubdivisionpermitforApplicationFileNo.LUA/SWP_____________________relatingtotherealproperty(“Property”)describedabove,theGrantor(s),theowner(s)infeeofthatProperty,hereby 31of50covenants(covenant)withCityorRenton,apoliticalsubdivisionofthestateofWashington,thathe/she(they)willobserve,consentto,andabidebytheconditionsandobligationssetforthanddescribedinParagraphsIthrough8belowwithregardtotheProperty.Grantor(s)herebygrants(grant),covenants(covenant),andagrees(agree)asfollows:I.Grantor(s)orhis/her(their)successorsininterestandassigns(“Owners”)shallretain,uphold,andprotectthestormwatermanagementdevices,features,pathways,limits,andrestrictions,knownasflowcontrolbestmanagementpractices(“BMPs”),shownontheapprovedFlowControlBMPSitePlanforthePropertyattachedheretoandincorporatedhereinasExhibitA.2.TheOwnersshallattheirowncost,operate,maintain,andkeepingoodrepair,theProperty’sBMPsasdescribedintheapprovedDesignandMaintenanceDetailsforeachfflvWattachedheretoandincorporatedhereinasExhibitB.3.CityorRentonshallprovideatleast30dayswrittennoticetotheOwnersthatentryonthePropertyisplannedfortheinspectionoftheBMPs.Afterthe30days,theOwnersshallallowtheCityofRentontoenterforthesolepurposeofinspectingtheBMPs.InlieuofinspectionbytheCity,theOwnersmayelecttoengagealicensedcivilengineerregisteredinthestateofWashingtonwhohasexpertiseindrainagetoinspecttheBMPsandprovideawrittenreportdescribingtheircondition.Iftheengineeroptionischosen,theOwnersshallprovidewrittennoticetotheCityofRentonwithinfifteendaysofreceivingtheCity’snoticeofinspection.Within30daysofgivingthisnotice,theOwners,ortheengineeronbehalfoftheOwners,shallprovidetheengineer’sreporttotheCityofRenton.Ifthereportisnotprovidedinatimelymannerasspecifiedabove,theCityofRentonmayinspecttheBMPswithoutfurthernotice.4.IftheCitydeterminesfromitsinspection,orfromanengineer’sreportprovidedinaccordancewithParagraph3,thatmaintenance,repair,restoration,and/ormitigationworkisrequiredfortheBMPs,TheCityshallnotifytheOwnersofthespecificmaintenance,repair,restoration,and/ormitigationwork(Work)requiredunderRMC4-6-030.TheCityshallalsosetareasonabledeadlineforcompletingtheWorkorprovidinganengineertsreportthatverifiescompletionoftheWork.Afterthedeadlinehas 32of50passed,theOwnersshallallowtheCityaccesstore-inspecttheBMPsunlessanengineer’sreporthasbeenprovidedveriingcompletionoftheWork.IftheworkisnotcompletedproperlywithinthetimeframesetbytheCity,theCitymayinitiateanenforcementaction.FailuretoproperlymaintaintheBMPsisaviolationofRMC4-6-030andmaysubjecttheOwnerstoenforcementundertheRMC1-3,includingfinesandpenalties.5.Apartfromperformingroutinelandscapemaintenance,theOwnersareherebyrequiredtoobtainwrittenapprovalfromtheCityorRentonbeforeperforminganyalterationsormodificationstotheBMPs.6.AnynoticeorapprovalrequiredtobegivenbyonepartytotheotherundertheprovisionsofthisDeclarationofCovenantshallbeeffectiveuponpersonaldeliverytotheotherparty,orafterthree(3)daysfromthedatethatthenoticeorapprovalismailedwithdeliveryconfirmationtothecurrentaddressonrecordwitheachParty.Thepartiesshallnoti&eachothcrofanychangctothciraddrcsscs.7.ThisDeclarationofCovenantisintendedtopromotetheefficientandeffectivemanagementofsurfacewaterdrainageontheProperty,anditshallinuretothebenefitofallthecitizensoftheCityofRentonanditssuccessorsandassigits.ThisDeclarationofCovenantshallrunwiththelandandbebindinguponGrantor(s),andGrantor’s(s)successorsininterestandassigns.8.ThisDeclarationofCovenantmaybeterminatedbyexecutionofawrittenagreementbytheOwnersandtheCityofRentonthatisrecordedbyKingCountyinitsrealpropertyrecords. 33of50INWITNESSWHEREOF,thisDeclarationofCovenantfortheMaintenanceandInspectionofFlowControlBMPsisexecutedthisdayof___________________,20GRANTOR,ownerofthePropertyGRANTOR,ownerofthePropertySTATEOFWASHINGTON)COUNTYOFKING)ss.Onthisdaypersonallyappearedbeforeme:________________________________________________tomeknowntobetheindividual(s)describedinandwhoexecutedthewithinandforegoinginstrumentandacknowledgedthattheysignedthesameastheirfreeandvoluntaryactanddeed,fortheusesandpurposesthereinstated.Givenundermyhandandofficialsealthis____ _dayof_____________________20PrintednameNotaryPublicinandfortheStateofWashington,residingatMyappointmentexpires 34of50TIRSECTION10OPERATIONSANDMAINTENANCEMANUAL:DRYWELLINFILTRATONSYSTEMMAINTENANCETheprimaryfactorcontrollingtimingofmaintenanceoftheDiywellissedimentloading.Runofftothedrywellcomesonlyfromthemetalroof.Sedimentloadingwillbeminimal.TheonlyotherpointsofentryofsedimentarethetwoType1catchbasinsintheparkinglotthatdirectflowfromtheroofintothedrywellviaperforatedpipes.Thesecatchbasinsarenotinadrainageswalesothesedimentloadshouldbeminimal.Soinspectingthecatchbasinsannuallyorwheninspecting/maintainingtheSTORMFILTERwillbeadequate. 35of50ertc;flCONSTRUCTiONPRODUCTSINC.StormFilterInspectionandMaintenanceProceduresTheStormwa(erManagementStormFilter 36of50MaintenanceGuidelinesTheprimarypurposeoftheStormwaterManagementStormFiIteristofilteroutandpreventpollutantsfromenteringourwaterways.Likeanyeffectivefiltrationsystem,periodicallythesepollutantsmustberemovedtorestoretheStormFiltertoitsfullefficiencyandeffectiveness.Maintenancerequirementsandfrequencyaredependentonthepollutantloadcharacteristicsofeachsite.Maintenanceactivitiesmayberequiredintheeventofachemicalspillorduetoexcessivesedimentloadingfromsiteerosionorextremestorms.Itisagoodpracticetoinspectthesystemaftermajorstormevents.MaintenanceProceduresAlthoughtherearelikelymanyeffectivemaintenanceoptions,webelievethefollowingprocedureisefficientandcanbeimplementedusingcommonequipmentandexistingmaintenanceprotocols.Atwostepprocedureisrecommendedasfollows:1.InspectionInspectionofthevaultinteriortodeterminetheneedformaintenance.2.MaintenanceCartridgereplacementSedimentremovalInspectionandMaintenanceTimingAtleastonescheduledinspectionshouldtakeplaceperyearwithmaintenancefollowingaswarranted.First,aninspectionshouldbedonebeforethewinterseason.Duringtheinspectiontheneedformaintenanceshouldbedeterminedand,ifdisposalduringmaintenancewillberequired,samplesoftheaccumulatedsedimentsandmediashouldbeobtained.Inadditiontothesetwoactivities,itisimportanttochecktheconditionoftheStormFilterunitaftermajorstormsforpotentialdamagecausedbyhighflowsandforhighsedimentaccumulationthatmaybecausedbylocalizederosioninthedrainagearea.ItmaybenecessarytoadjusttheinspectioWmaintenancescheduledependingontheactualoperatingconditionsencounteredbythesystem.Ingeneral,inspectionactivitiescanbeconductedatanytime,andmaintenanceshouldoccur,ifwarranted,inlatesummertoearlyfallwhenflowsintothesystemarenotlikelytobepresent.MaintenanceFrequencyTheprimaryfactorcontrollingtimingofmaintenanceoftheStormFilterissedimentloading.Aproperlyfunctioningsystemwillremovesolidsfromwaterbytrappingparticulatesintheporousstructureofthefiltermediainsidethecartridges.Theflowthroughthesystemwillnaturallydecreaseasmoreandmoreparticulatesaretrapped.Eventuallytheflowthroughthecartridgeswillbelowenoughtorequirereplacement.Itmaybepossibletoextendtheusablespanofthecartridgesbyremovingsedimentfromupstreamtrappingdevicesonaroutineas-neededbasisinordertopreventmaterialfrombeingre-suspendedanddischargedtotheStormFiltertreatmentsystem.Siteconditionsgreatlyinfluencemaintenancerequirements.StormFilterunitslocatedinareaswitherosionoractiveconstructionmayneedtobeinspectedandmaintainedmoreoftenthanthosewithfullystabilizedsurfaceconditions.Themaintenancefrequencymaybeadjustedasadditionalmonitoringinformationbecomesavailableduringtheinspectionprogram.Areasthatdevelopknownproblemsshouldbeinspectedmorefrequentlythanareasthatdemonstratenoproblems,particularlyaftermajorstorms.Ultimately,inspectionandmaintenanceactivitiesshouldbescheduledbasedonthehistoricrecordsandcharacteristicsofanindividualStormFiltersystemorsite.ItisrecommendedthatthesiteownerdevelopadatabasetoproperlymanageStormEilterinspectionandmaintenanceprograms.Priortothedevelopmentofthemaintenancedatabase,thefollowingmaintenancefrequenciesshouldbefollowed:InspectionOnetimeperyearAftermajorstormsMaintenanceAsneeded,basedonresultsofinspection(Theaveragemaintenancelifecycleisapproximately1-3years)PerRegulatoryrequirementIntheeventofachemicalspillFrequenciesshouldbeupdatedasrequired.TherecommendedinitialfrequencyforinspectionisonetimeperyearStormFilterunitsshouldbeinspectedaftermajorstorms.Second,ifwarranted,amaintenance(replacementofthefiltercartridgesandremovalofaccumulatedsediments)shouldbeperformedduringperiodsofdryweather2 37of50Sedimentremovalandcartridgereplacementonanasneededbasisisrecommendedunlesssiteconditionswarrant.Onceanunderstandingofsitecharacteristicshasbeenestablished,maintenancemaynotbeneededforonetothreeyears,butinspectioniswarrantedandrecommendedannually.InspectionProcedure5Theprimarygoalofaninspectionistoassesstheconditionofthecartridgesrelativetothelevelofvisualsedimentloadingasitrelatestodecreasedtreatmentcapacity.Itmaybedesirabletoconductthisinspectionduringastormtoobservetherelativeflowthroughthefiltercartridges.Ifthesubmergedcartridgesareseverelyplugged,thentypicallylargeamountsofsedimentswillbepresentandverylittleflowwillbedischargedfromthedrainagepipes.Ifthisisthecase,thenmaintenanceiswarrantedandthecartridgesneedtobereplaced.Warning:Inthecaseofaspill,theworkershouldabortinspectionactivitiesuntiltheproperguidanceisobtained.NotifythelocalhazardcontrolagencyandCONTECHConstructionProductsimmediately.Toconductaninspection:Important:InspectionshouldbeperformedbyapersonwhoisfamiliarwiththeoperationandconfigurationoftheStormFiltertreatmentunit.1.Ifapplicable,setupsafetyequipmenttoprotectandnotifysurroundingvehicleandpedestriantraffic.3.Opentheaccessportalstothevaultandallowthesystemvent.6.Withoutenteringthevault,visuallyinspecttheinsideoftheunit,andnoteaccumulationsofliquidsandsolids.5.Besuretorecordthelevelofsedimentbuild-uponthefloorofthevault,intheforebay.andontopofthecartridges.Ifflowisoccurring,notetheflowofwaterperdrainagepipe.Recordallobservations.Digitalpicturesarevaluableforhistoricaldocumentation.6.Closeandfastentheaccessportals.7.Removesafetyequipment.8.ifappropriate,makenotesaboutthelocaldrainagearearelativetoongoingconstruction,erosionproblems,orhighloadingofothermaterialstothesystem.9.Discussconditionsthatsuggestmaintenanceandmakedecisionastoweatherornotmaintenanceisneeded.MaintenanceDecisionTreeTheneedformaintenanceistypicallybasedonresultsoftheinspection.ThefollowingMaintenanceDecisionTreeshouldbeusedasageneralguide.(Otherfactors,suchasRegulatoryRequirements,mayneedtobeconsidered)a.if>4”ofaccumulatedsediment,maintenanceis2.Sedimentloadingontopofthecartridge.a.If>1/4”ofaccumulation,maintenanceisrequired.3.Submergedcartridges.a.if>4’ofstaticwaterinthecartridgebayformorethat24hoursafterendofrainevent,maintenanceisrequired4.Pluggedmedia.a.Ifporespacebetweenmediagranulesisabsent,maintenanceisrequired.5.Bypasscondition.a.IfinspectionisconductedduringanaveragerainfalleventandStormFilterremainsinbypasscondition(waterovertheinternaloutletbafflewallorsubmergedcartridges),maintenanceisrequired.6.Hazardousmaterialrelease.a.ifhazardousmaterialrelease(automotivefluidsorother)isreported,maintenanceisrequired.7.Pronouncedscumline.a.Ifpronouncedscumline(say1/4”thick)ispresentabovetopcap,maintenanceisrequired.8.CalendarLifecycle.a.Ifsystemhasnotbeenmaintainedfor3yearsmaintenanceisrequired.2.Visuallyinspecttheexternalconditionoftheunitandtakenotesconcerningdefects/problems.1.Sedimentloadingonthevaultfloor.required.S—F,,‘es.nc”tr’;.,a‘‘-.-3 38cr50Assumptions•Norainfallfor24hoursormore•Noupstreamdetention(atleastnotdrainingintoStormFilter)•Structureisonline•Outletpipeisclearofobstruction•ConstructionbypassispluggedMaintenanceDependingontheconfigurationoftheparticularsystem,maintenancepersonnelwillberequiredtoenterthevaulttoperformthemaintenance.Important:Ifvaultentryisrequired,OSHArulesforconfinedspaceentrymustbefollowed.FiltercartridgereplacementshouldoccurduringdryweatherItmaybenecessarytoplugthefilterinletpipeifbaseflowsisoccurring.Replacementcartridgescanbedeliveredtothesiteorcustomersfacility.InformationconcerninghowtoobtainthereplacementcartridgesisavailablefromCONTECHConstructionProducts.Warning:Inthecaseofaspill,themaintenancepersonnelshouldabortmaintenanceactivitiesuntiltheproperguidanceisobtainedNotifythelocalhazardcontrolagencyandCONThCHConstructionProductsimmediately.Toconductcartridgereplacementandsedimentremovalmaintenance:1.Ifapplicable,setupsafetyequipmenttoprotectmaintenancepersonnelandpedestriansfromsitehazards.2.Visuallyinspecttheexternalconditionoftheunitandtakenotesconcerningdefects/problems.3.Openthedoors(accessportals)tothevaultandallowthesystemtovent.4.Withoutenteringthevault,givetheinsideoftheunit,includingcomponents,ageneralconditioninspection.S.Makenotesabouttheexternalandinternalconditionofthevault.Giveparticularaftentiontorecordingthelevelofsedimentbuild-uponthefloorofthevault,intheforebay,andontopoftheinternalcomponents.6.Usingappropriateequipmentoffloadthereplacementcartridges(upto150lbs.each)andsetaside.7.Removeusedcartridgesfromthevaultusingoneofthefollowingmethods:Method1:A.Thisactivitywillrequirethatmaintenancepersonnelenterthevaulttoremovethecartridgesfromtheunderdrainmanifoldandplacethemunderthevaultopeningforlifting(removal).Unscrew(counterclockwiserotations)eachfiltercartridgefromtheunderdrainconnectorRolltheloosecartridge,onedge,toaconvenientspotbeneaththevaultaccess.Usingappropriatehoistingequipment,attachacablefromtheboom,crane,ortripodtotheloosecartridge.ContactCONTECHConstructionProductsforsuggestedattachmentdevices.B.Removetheusedcartridges(upto250lbs.each)fromthevauIt.ImportantCaremustbeusedtoavoiddamagingthecartridgesduringremovalandinstallation.ThecostofrepairingcomponentsdamagedduringmaintenancewillbetheresponsibilityoftheownerunlessCONTECHConstructionProductsperformsthemaintenanceactivitiesanddamageisnotrelatedtodischargestothesystem.C.Settheusedcartridgeasideorloadontothehaulingtruck.D.Continuestepsathroughcuntilallcartridgeshavebeenremoved.Method2:A.Enterthevaultusingappropriateconfinedspaceprotocols.B.Unscrewthecartridgecap.C.Removethecartridgehoodscrews(3)hoodandfloat.0.Atlocationunderstructureaccess,tipthecartridgeonitsside.1.-.t—,_;Important:Notethatcartridgescontainingleafmedia(CSF)donotrequireunscrewingfromtheirconnectorsTakecarenottodamagethemanifoldconnectorsThisconnectorshouldremaininstalledinthemanifoldandcouldbecappedduringthemaintenanceactivitytopreventsedimentsfromenteringtheunderdrainmanifold.4 39of50Important:Notethatcartridgescontainingmediaotherthantheleafmediarequireunscrewingfromtheirthreadedconnectors.Takecarenottodamagethemanifoldconnectors.Thisconnectorshouldremaininstalledinthemanifoldandcappedifnecessary.13.Emptythecartridgeontothevaultfloor.Reassembletheemptycartridge.E.Settheempty,usedcartridgeasideorloadontothehaulingtruck.F.Continuestepsathrougheuntilallcartridgeshavebeenremoved.9.Oncethesedimentsareremoved,assesstheconditionofthevaultandtheconditionoftheconnectors.Theconnectorsareshortsectionsof2-inchschedule40PVC,orthreadedschedule80PVCthatshouldprotrudeabout1”abovethefloorofthevault.Lightlywashdownthevaultinterior.a.Replaceanydamagedconnectors.10.Usingthevacuumtruckboom,crane,ortripod,lowerandinstallthenewcartridges.Onceagain,takecarenottodamageconnections.11.Closeandfastenthedoor.12.Removesafetyequipment.13.Finally,disposeoftheaccumulatedmaterialsinaccordancewithapplicableregulations.MakearrangementstoreturntheusedrnpycartridgestoCONTECHConstructionProducts.I8.Removeaccumulatedsedimentfromthefloorofthevaultandfromtheforebay.Thiscanmosteffectivelybeaccomplishedbyuseofavacuumtruck.5 40of50RelatedMaintenanceActivities-Performedonanas-neededbasisStormFilterunitsareoftenjustoneofmanystructuresinamorecomprehensivesormwaterdrainageandtreatmentsystem.InorderformaintenanceoftheStormFiltertobesuccessful,itisimperativethatallothercomponentsbeproperlymaintained.ThemaintenancWrepairofupstreamfacilitiesshouldbecarriedoutpriortoStormFiltermaintenanceactivities.Inadditiontoconsideringupstreamfacilities,itisalsoimportanttocorrectanyproblemsidentifiedinthedrainagearea.Drainageareaconcernsmayinclude:erosionproblems,heaioilloading,anddischargesofinappropriatematerials.MaterialDisposalTheaccumulatedsedimentfoundinstormwatertreatmentandconveyancesystemsmustbehandledanddisposedofinaccordancewithregulatoryprotocols.Itispossibleforsedimentstocontainmeasurableconcentrationsofheawmetalsandorganicchemicals(suchaspesticidesandpetroleumproduct).Areaswiththegreatestpotentialforhighpollutantloadingincludeindustrialareasandheavilytraveledroads.Sedimentsandwatermustbedisposedofinaccordancewithallapplicablewastedisposalregulations.Whenschedulingmaintenance,considerationmustbemadeforthedisposalofsolidandliquidwastes.Thistypicallyrequirescoordinationwithalocallandfillforsolidwastedisposal.Forliquidwastedisposalanumberofoptionsareavailableincludingamunicipalvacuumtruckdecantfacility,localwastewatertreatmentplantoron-sitetreatmentanddischarge.REcYcLEDtPAPERSupporta’aiwranaCSTNOCflOPOOUCflmc800.338.1122www.contech-cpi.com•Drawingsandspecificationsareavailableatcontechstormwater.com.•Site-specificdesignsupportisavailablefromourengineers.©2009CONTECHConstructionProductsInc.CONTECHConstructionProductsInc.providessitesolutionsforthecivilengineeringindustry.CONTECH’sportfolioincludesbridges,drainage,sanitarysewer,stormwaterandearthstabilizationproducts.ForinformationonotherCONTECHdivisionofferings,visitcontech-cpi,comorcall800.338.1122Nothinginthiscatalogshouldbeconstruedasanexpressedwarrantyoranimpliedwarrantyofmerchantabilityorfitnessforanyparticularpurpose.SeetheCONTECHstandardquotationoracknowledgementforapplicablewarrantiesandothertermsandconditionsofsale.Theproduct(s)describednaybeprotectedbyoneormoreofthefollowinguspatents:5,322.629;5,624,576;5.107,527;5,759,415;5,788,646;5,985,157;6,027,639;6,350.374;6,406,218;6,641,720;6,511,595;6,649,049;6.991.114;6,998,039;7,186,058;relatedforeignpatentsorotherpatent,pending. 41of50InspectionReportDate:Personnel:____ ___ __ _ __ _ __ ___ ___ ___ ___ __ _ __ _ __ ___Location:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _SystemSize:____________________________________________________________________________SystemType:VaultCCast-In-PlaceCLinearCatchBasinElManholeCOtherCDate:SedimentThicknessinForebay:Se dim e nt Dep th on Va u l t F lo o r _____________ _ _ _ _ _ _ _ ____________ _ _ _ _ _ _ _ _ ____________ _ _ _ _ _ _ _ _ ____________ _ _ _ _ _ _ _ _ ____________ _ _StructuralDamage:EstimatedFlawfromDrainagePipes(ifavailab’e):CartridgesSubmerged:YesCNoCDepthofStandingWater:____________________________________________StormFilterMaintenanceActivities(checkoffifdoneandgivedescription)CTrashandDebrisRemoval:____ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ ___ _ __ _ ___ __CMinorStructuralRepairs:CDrainageAreaReportExcessiveOilLoading:SedimentAccumulationonPavement:__________________________________________________ErosionofLandscapedAreas:__________________________________________________ItemsNeedingFurtherWork:Ownersshouldcontactthelocalpublicworksdepartmentandinquireabouthowthedepartmentdisposesoftheirstreetwasteresiduals.OtherComments:YesCNoCSource:YesCNoCSource:YesCNoCSource: Date:Location:-SystemTypo:VaultLIListSafetyProceduresandEquipmentUsed:SystemObservationsMonthsinService:OilinForebay:SedimentDepthinForebay:SedimentDepthonVaultfloor:__________StructuralDamage:DrainageAreaReportExcessiveOilLoading:SedimentAccumulationonPavement:ErosionofLandscapedAreas:StormFilterCartridgeReplacementRemoveTrashandDebris:ReplaceCartridges:YesSedimentRemoved:YesQuantityofSedimentRemoved(estimate?):MinorStructuralRepairs:Residuals(debris,sediment)DisposalMethods:.Notes:42ofSDReviewtheconditionreportsfromthepreviousinspectionvisits.StormFilterMaintenanceReport_______Personnel:_______SystemSize:—Cast-In-PlaceLILinearCatchBasinLIManholeLIOtherLIYesLINoLIYesNoLIYesLINoLIYesLINoLISource:Source:Source:MaintenanceActivitiesYesLINoLIDetails:LINoLIDetails:LINoflDetails:LINoLIDetails: 43of50SPECIALREOUIREMENT#1.OtherAdontedRequirementsN/ASPECIALREOUIUEMENT#2.FloodHazardAreaDelineationN/ASPECIALREOUUEMENT#3.FloodProtectionFacilitiesN/ASPECIALREOUIREMENT#4.SourceControlN/ASPECIALREOUIREMENT#5.OilControlN/ASPECIALREOUIUEMENT#6.AquiferProtectionPlanN/A a44of50APPENDIXAKCRTSCommandCREATEanewTimeSeriesProductionofRunoffTimeSeriesProjectLocation:Sea—TacComputingSeries:MYDENTALPREDEV15XIN.tsfRegionalScaleFactor1.00DataTypeHistoricCreating15—minuteTimeSeriesFileLoadingTimeSeriesFile:C:\KCSWDM\KCDATA\STOG1SH.rnf0.14acresLoadingTimeSeriesFile:C:\KCSWDM\KCDATA\STEI15N.rnf0.09acresTotalArea:0.23acresPeakDischarge:0.226CFSat11:45onDec29in1996StoringTimeSeriesFile:MYDENTALTimeSeriesComputedOutwashGrassImperviousPREDEV15MIN.tsfKCRTSCommandEntertheAnalysisTOOLSModuleAnalysisToolsCommandComputePEAKSandFlowFrequenciesLoadingStage/Dischargecurve:mydentalpredev15min.tsfFlowFrequencyAnalysisLogPearsonIIICoefficientsTimeSeriesFile:mydentalpredev15miMean—1.311StdDev=0.163ProjectLocation:Sea—TacSkew=1.662AnalysisToolsCommandComputePEAKSandFlowFrequenciesLoadingTimeSeriesFile:mydentalpredev15min.tsfFlowFrequencyAnalysisLogPearsonIIICoefficientsTimeSeriesFile:mydentalpredev15miMean-1.311StdDev=0.163Pro-ectLocation:Sea—TacSkew=1.662Frequencies&PeakssavedtoFile:MYDENTALPREDEV.pksCoTtedPeaks0.176100.000.990<=======ComputedPeaks0.14050.00o.geoComputedPeaks0.11025.000.960CoT.tedPeaks0.08010.000.900ComputedPeaks0.0758.000.875ComputedPeaks0.0635.000.800ComputedPeaks0.0442.000.500ComputedPeaks0.0371.300.231APPENDIXB 45of50CREATEanewTimeSeriesProductionofRunoffTimeSeriesProjectlocation:Sea—TacComputingSeries:0EVROOFINF1L.tsfRegionalScaleFactor:1.00DataType:HistoricCreating15—minuteTimeSeriesFileLoadingTimeSeriesFile:C:\KCSWDM\KCDATA\STOG15H.rnfOutwashGrass0.06acresLoadingTimeSeriesFile:C:\KCSWDM\KCOATA\STEI1SH.rnfImpervious0.17acresTotalArea:0.23acresPeakDischarge:0.307CFSat11:45onDec29in1996StoringTimeSeriesFile:DEVROOFINFIL.tsfTimeSeriesComputedKCRTSCommandEntertheAnalysisTOOLSModuleAnalysisToolsCommandComputePEAKSandFlowFrequenciesLoadingStage/Dischargecurve:devroofinfil.tsfFlowFrequencyAnalysisLogPearsonIIICoefficientsTimeSeriesFjle:devroofinfil.tsfNean=—1.055Stdflev0.147ProjectLocation:Sea—TacSkew1.296Frequencies&PeakssavedtoFile:DEVROOFINFIL.pksAnalysisToolsCommandFlowFrequencyAnalysisLogPearsonIIICoefficients 46of50TimeSeriesFile:devroofinfil.tsfMean-1.055StdDev0.147ProjectLocation:Sea-TacSkew=1.296ComputedPeaks0.262100.000.990<—ComputedPeaks0.21850.000.980ComputedPeaks0.18025.000.960ComputedPeaks0.13910.000.900ComputedPeaks0.1328.000.875ComputedPeaks0.1135.000.800ComputedPeaks0.0822.000.500ComputedPeaks0.0681.300.231C 47of50.otn4;TAXPARCELNO.7224000855:11I.-t4,5IflP•Wpci-FaT24USLa4,-Z-LOT---A-A[4—-t‘;;--14W.-:-IHIPQnw-1orGRAPHICSCAII1204,L_4EXISTINGGROUNDCOVER———111=20’I102030IJFIGURENO.1 48of50PROPOSEDGROUNDCOVERHICSCALEfl’20I1=201020LANDSCAPING,TYPICAL.FORKCRTSMODELINGUSEPASTURE.ENTIRESITEWILLBEIMPERVIOUSEXCEPTFORLANDCAPEAREAS.SSEPARATEISAREAS=1,049mFIGURENO.2 a49of50APPENDIXCKCRTSCommandCREATEanewTimeSeriesProductionofRunoffTimeSeriesProjectLocation:Sea-TacComputingSeries:WQ5600SF.tsfRegionalScaleFactor:1.00DataType:ReducedCreating15-minuteTimeSeriesFileLoadingTimeSeriesFile:C:\KC_SWDM\KC_DATA\STEI15R.rnfImpervious0.13acresTotalArea:0.13acresPeakDischarge:0.152CFSat6:30onJan9inYear8StoringTimeSeriesFile:WQ5600SF.tsfTimeSeriesComputedKCRTSCommandEntertheAnalysisTOOLSModuleAnalysisToolsCommandComputePEAKSandFlowFrequenciesLoadingStage/Dischargecurve:wq5600sf.tsfFlowFrequencyAnalysisTimeSeriesFile:wq5600sf.tsfProjectLocation:Sea-TacFrequencies&PeakssavedtoFile:WQ5600SF.pksAnalysisToolsCommandFlowFrequencyAnalysisTimeSeriesFile:wq5600sf.tsfProjectLocation:Sea-Tac---AnnualPeakFlowRates---FlowFrequencyAnalysisFlowRateRankTimeofPeak--Peaks--RankReturnProb(CFS)(CFS)Period0.06168/27/0118:000.1521100.000.9900.04389/17/0217:450.116225.000.9600.116212/08/0217:150.083310.000.9000.04978/23/0414:300.06845.000.8000.065510/28/0416:000.06553.000.6670.068410/27/0510:450.06162.000.500<= 50of500.083310/25/0622:450.04971.300.2310.15211/09/086:300.04381.100.091ComputedPeaks0.14050.000.980