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.LJ,-J(_.4,_%nDiUCOUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING3e7S* COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGENGINEERINGREPORTTechnicalInformationReportSouthportOfficeRenton,WAPREPAREDFOR:SECODevelopment1083LakeWashingtonBlvdN,Suite50Renton,WA98056(425)282-5833PREPAREDTHROUGH:ZGFArchitecture925FourthAvenue,Suite2400Seattle,WA90104Phone:(206)623-9414PREPAREDBY:COUGHLINPORTERLUNDEEN801SecondAvenue,Suite900Seattle,WA98104P206.343.0460CONTACT!HartBalko,P.E.ReceivedOCT132015DevelopmentServicesp801SECONDAVENUE.SUITE900SEATTLE,WA98104/P206.313,0460/cplinc.com . pCOUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGTABLEOFCONTENTSI.PROJECTOVERVIEWIGeneralDescription1/4ExistingConditions1ProposedDrainageSystem1II.CONDITIONSANDREQUIREMENTS2SpecialRequirements2ProjectSpecificRequirements3Ill.OFF-SITEANALYSIS4Task1—StudyAreaDefinitionandMaps4Task2-ResourceReview4Task3-FieldInspection4Task4-DrainageSystemDescriptionandProblemDescriptions4UpstreamAnalysis4DownstreamAnalysis5Task5—MitigationofExistingorPotentialProblems5IV.FLOWCONTROLANDWATERQUALITYFACILITYANALYSISANDDESIGN6ExistingSiteHydrology(PartA)6DevelopedSiteHydrology(PartB)6PerformanceStandardsandFlowControlSystem(PartsCandD)6WaterQualitySystem(PartE)7V.CONVEYANCESYSTEMANALYSISANDDESIGN8StandardRequirements(basedonKCSWDMandSAO)8On-siteConveyance8ExistingConditlons8DevelopedStormsystemdescription8VI.SPECIALREPORTSANDSTUDIES9VII.OTHERPERMITS10VIII.CSWPPPANALYSISANDDESIGN11StandardRequirements11////IX.BONDQUANTIW,FACILITYSUMMARIES,ANDDECRATIONOFCOVENANT12X.OPERATIONANDMAINTENANCEMANUAL13StandardMaintenance13AppendixA—Figures24801SECONDAVENUE.SUITE900SEATTLE,WA98104/P206.343.0460/cplinc.Com . ‘7pCOUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING1.PROJECTOVERVIEWGENERALDESCRIPTIONThefollowingpreliminaryTechnicalInformationReport(TIR)providesthetechnicalinformationanddesignanalysisrequiredfordevelopingtheDrainageandTemporaryErosionandSedimentationControlPlan(TESC)fortheSouthportOfficeproject.ThestormwaterdesignfortheprojectwasbasedontherequirementssetforthintheCityofRentonAmendmentstothe2009KingCountySurfaceWaterDesignManual(KCSWDM)(SeeFigure1—TechnicalInformationReportWorksheet)andthe2009KCSWDM.TheSouthportOfficeprojectislocatedwithintheCityofRenton,situatedatthesoutherntipofLakeWashingtontothewestoftheGeneCoulonMemorialBeachPark(SeeFigure3—SiteLocation).ThesiteisintheNW¼oftheNW¼ofSection8,Township23North,Range5East,WillametteMeridian.Thesitewilloccupyparcel0823059216,withanareaof233,210squarefeet.Overall,theprojectwillincludea3-towerofficebuildingandgeneralsiteimprovementsincludinglandscaping,parkingarea,andfireaccessTheexistingsiteconsistsof1.87acresofimperviousareaand3.48acresofpeMousarea.Theproposedconditionswillconsistofapproximately4.95acresofimperviousareaand0.40acresofperviousarea.SoilsfortheareaweremappedusingtheKingCountySoilSurveymaps(SeeFigure7’)8—SoilSurveyMap).0RunofffromthesitewillbedischargeddirectlytoLakeWashingtonviapipeflow.EXISTINGCONDITIONSTheexistingsiteconsistsofasphaltandgravelparkinglotsaswellasopengrassyareas.SeeTableIforsitesurfacecoverinformation.ThesitewaspreviouslyhometotheShuffletonSteamPlant,whichwasbuiltinthe1930’sanddemolishedin2001.Portionsofthesteamplantinfrastructurearestillinplace,includingalargeundergroundconcretevault,whichthisprojectproposestoreusetoprovidewaterqualitytreatmentforrunofffromthesurfaceparkinglot.RefertoSectionIVformoreinformation.PROPOSEDDRAINAGESYSTEMAccordingtoTable1.1.2.AoftheCityofRentonAmendmentstotheKingCountySurfaceWaterManual(COR-SWM),thiaprojectmeetsthecriteriaforaFullDrainageReview,includingflowcontrolandwaterqualityrequirements.Sincetheprojectiswithinabasicwaterqualitytreatmentbasin,BasicwaterqualitytreatmentforrunofffromalltargetpollutiongeneratingsurfaceswillbeprovidedbyeitheroneoftwowetvaultsoracartridgefiltersystembeforebeingdischargedtoLakeWashington.Conveyanceforthesitewillbeacombinationofclosed6to15-inchpipesandsheetflow.Stormwaterrunofffrompollutiongeneratingimpervioussurfaces(PGIS)willbecapturedbyaseriesofcatchbasinsandroutedtotheexistinglargewetvaultonsite.AllconveyanceonsitewillbedesignedaccordingtoChapter4oftheCityofRentonAmendmentstotheKCSWDM.801SECONOAVENUE.SUiTE900SEATTLE,WA98104/P206343.0460/cpilnc.com COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGII.CONDITIONSANDREQUIREMENTSThissectionwilladdresstherequirementssetforthbytheCoreandSpecialRequirementslistedinChapter1oftheCityofRenton’sAmendmentstotheKingCountySurfaceWaterDesignManual.CityofRentonAmendmentstotheKingCountySurfaceWaterManagementDesignManualCoreRequirements:1.DischargeattheNaturalLocation(121):Allrunofffromthesitewillbeconveyedtothenaturaldischargelocation(LakeWashington).2.Off-siteAnalysis(1.2.2):RefertoSectionsIllandIV.ALevel1downstreamanalysishasbeenperformed3.FlowControl(1.2.3.1):RefertoSectionIV.SincetheprojectdischargesdirectlytoLakeWashington,flowcontrolisnotrequired.4.ConveyanceSystem(1.2.4):RefertoSectionV.Closedpipesystemshavebeenprovidedforon-sitestormwaterconveyance.5.ErosionandSedimentationControl(1.2.5):RefertoSectionVIII,Theprojectwillconstructaseriesofsedimentcontrolstoaddressthespecificconditionsatthesite.6.MaintenanceandOperations(1.2.6):RefertoSectionX.Theproposedstormdrainagesystemwillbeowned,operatedandmaintainedbytheowner.7.FinancialGuaranteesandLiability(1.2.7):Theownerandcontractorwillobtainallnecessarypermitsandbondspriortothebeginningofconstruction.8.WaterQuality(1.2.8):RefertoSectionIV.E.Waterqualitytreatmentforrunofffromtargetpollutiongeneratingsurfaceswillbeprovidedbytheexistingwetvaultonsite.SeeSectionIVformoreinformation.SPECIALREQUIREMENTS:SpecialRequirement#1.OtherAdoptedArea-SpecificRequirementsSection1.3.1•CriticalDrainageAreas(CDA5):NotApplicable•MasterDrainagePlans(MDP5):Therearenoknownmasterdrainageplanscoveringthisprojectsite.•BasinPlans(BPS):TheprojectislocatedwithinLowerCedarRiverDrainageBasin.LakeManagementPlans(LMP5):NotApplicableSharedFacilityDrainagePlans(SFDPs):NotApplicableSpecialRequirement#2.FloodHazardAreaDelineation,Section1.3.2:SeeFigure7for100-yrfloodzone.Noworkaffectingthefloodstoragewilltakeplacewithinthe100-yrfloodzone.SpecialRequirement#3.FloodProtectionFacilities,Section1.3.3:NotApplicableSpecialRequirement#4.SourceControls,Section1.3.4:SeeattachedActivityWorksheetandRequiredBMP’s.SpecialRequirement#5.OilControl:Minimaltrafficisanticipatedinthisarea.Nooilcontrolisrequired.SOUTHPORTOFFICE2 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSISMICENGINEERINGPROJECTSPECIFICREQUIREMENTSTherearenoadditionalrequirementsforthisportionoftheproject.DesignandconstructionwillabidebyrequirementssetforthinthesedocumentsandKingCounty.SOUTHPORTOFFICE3 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIII.OFF-SITEANALYSISTASK1—STUDYAREADEFINITIONANDMAPSTheRentondrainagebasinmapwasusedtoverifythatthesitewasfullyintheLowerCedarRiverdrainagebasin(SeeFigure4—DrainageBasinMap).TASK2-RESOURCEREVIEWa)AdoptedBasinPlansLowerCedarRiverDrainageBasinb)Floodplain/floodway(FEMA)MapsSiteisnotlocatedinthefloodplain(SeeFigure7)c)Off-siteAnalysisReportsN/Ad)SensitiveAreasFolioSeeFigures7—KingCountyMAPe)DrainageComplaintsandStudiesSeeFigure91)RoadDrainageProblemsNIAg)KingCountySoilsSurvey:SeeFigure8—CityofRentonSoilSurveyMaph)WetlandInventoryMaps:NoWetlandsi)MigratingRiversStudyN/Aj)DOE’sSection303dListofPollutedWatersN/Ak)KCDesignatedWaterQualityProblemsNoWQProblemsI)CityofRentoncriticalmaps:NoCriticalAreasTASK3-FIELDINSPECTIONSitevisitshavebeenmadetogatherinformationincludingananalysisofthedischargefromthesite.PleaserefertoTask4,DownstreamAnalysisbelowformoreinformation.TASK4-DRAINAGESYSTEMDESCRIPTIONANDPROBLEMDESCRIPTIONSRunofffromthesitewillbeconveyedtoanexistingstormsystemthatdischargesdirectlytoLakeWashington.Theparkingareawillberoutedtotheexistingwetvaultbeforebeingpumpedouttotheexishngstormsystemintheprivateaccessroadtothenortheastofthesite.Similarly,runofffromthebuildingroofandsurroundinghardscapeswillbecollectedandroutedtothesameexistingstormsystem.RoadwayrunoffwillbecollectedinaseriesofcatchbasinsandwillberoutedtoaStormFiltersystempriortodischargetotheexistingstormsystemtothenorthwestofthesite.UpstreamAnalysisThesiteiswithintheLakeWashingtonEastdrainagebasin.Anexistingconveyancepipe,installedaspartoftheHotelatSouthportproject,isroutedthroughthesiteanddischargesrunofftoLakeWashington.ThisexistingbypasspipeconveysrunofffromtheadjacentPSEpropertytothesouth.SOUTHPORTOFFICE COUGHLINPORTERLUNDEENSTRUCTURAtCIV(LStISMICNC(NEER(NCDownstreamAnalysisThesitedischargesdirectlytoLakeWashingtonviaexistingpipeconveyanceandexistingoutfallstothelake.TASK5—MITIGATIONOFEXISTINGORPOTENTIALPROBLEMSTherearenoknownproblemsdrainagecomplaintsdownstreamofthesite(SeeFigure9).Nomitigationisproposed.SOUTHPORTOFFICE5 COUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIV.FLOWCONTROLANDWATERQUALITYFACILITYANALYSISANDDESIGNEXISTINGSITEHYDROLOGY(PARTA)Theexistingsitetotals5.35acresandconsistsofanexistingasphalt/gravelparkinglotandagrassfield.ThesitegenerallyslopestothewestwithdrainagedescribedinSectionIIIDownstreamAnalysis.TheseconditionsaresummarizedinTable1below.TABLE1-EXISTINGSITECONDITIONSAREABREAKDOWNDEScRIPTIONAREA(SQUAREFEET)AREA(ACRES)TOTALPERVIOUSI151,6233.48TOTALIMPERVIOUS81,5871.87TOTALDISTURBEDAREA233,2105.35DEVELOPEDSITEHYDROLOGY(PARTB)Thedevelopedsitehydrologywillincreasetheamountofimperviousareabyapproximately3.08acres.AsummaryofthebasininformationisshowninTable2.TABLE2-DEVELOPEDSITECONDITIONSAREABREAKDOWNDESCRIPTIONAREA(SQUAREFEET)AREA(ACRES)TOTALPERVIOUS2,1970.40TOTALIMPERVIOUS231,013495TOTALDISTURBEDAREA233,210PERFORMANCESTANDARDSANDFLOWCONTROLSYSTEM(PARTSCANDD)AccordingtoSection1,2.3.1(andtheFlowControlBasinMap)oftheCityofRentonAmendmentstotheKCSWM,thisprojectislocatedwithinthePeakFlowControlarea.However,sincethisprojectdischargesdirectlytoLakeWashingtonandsatisfiesalloftheDirectDischargeExemptioncriteria(discussedbelow),flowcontrolisnotrequired.SOUTHPORTOFFICE6 COUGHLINPORTERLUNDEENSTRUCTURALLIVILSEISMICENGINEERINGDirectDischargeExemptionCriteria:A)TheprojectsitedischargestoLakeWashingtonB)Theconveyancesystembetweentheprojectsiteandthemajorreceivingwater(LakeWashington)willextendtotheordinaryhighwatermark,andwillbecomprisedofmanmadeconveyanceelements(pipes)andwillbewithinapublicorprivatedrainageeasement.C)Theconveyancesystemwillhaveadequatecapacitytoconveythe25-yearpeakflow(perCoreRequirement#4,ConveyanceSystem)fortheentirecontributingdrainagearea.D)TheconveyancesystemwillbeadequatelystabilizedtopreventerosionE)Thedirectdischargeproposalwillnotdivertflowsfromorincreaseflowstoanexistingwetlandorstreamsufficienttocauseasignificantadverseimpact.WATERQUALITYSYSTEM(PARTE)Section1.2.8.1(A)oftheCityofRentonAmendmentstotheKCSWDMoutlinesthespecificlanduseswithinBasicWQTreatmentareaswhicharesubjecttoprovidingEnhancedBasicWAtreatment.Beingacommerciallanduse,theSouthportHotelprojectfallsintothecategoryofEnhancedBasicWOTreatment.However,exceptionnumber3ofSection1.2.8.1(A)statesthat“TheEnhancedBasicWQmenuasspecifiedaboveforcertainlandusesmaybereducedtotheBasicWQmenufortreatmentofanyrunoffthatisdischargeddirectly,viaanon-fish-bearingconveyancesystem,allthewaytotheordinarjhighwatermarkofastreamwithameanannualflowof1,000cfsormore(atthedischargepointoftheconveyancesystem)oralakethatis300acresorlarger”SincethisprojectwilldischargerunoffdirectlytoLakeWashington(approximately21,500acres)viaapipedconnection,itwouldfollowthattheprojectisexemptfromprovidingEnhancedBasicWQtreatment.Similarly,the“IntentparagraphofSection1.2.8.1(A)statesthat,“projectsthatdrainentirelybypipetothemajorreceivingwaterslistedonpage1-33[oneofwhichisLakeWashington]areexcusedfromtheincreasedtreatmentandmayreverttotheBasicWQmenubecauseconcentrationeffectsareoflessconcernastheoverallflowvolumeincreases.”Therefore,basicwaterqualitytreatmentforallnewandreplacedpollutiongeneratingimpervioussurfaces(PGIS)willbeprovidedbyeitherawetvaultoraStormFiltercartridgesystem,dependingonlocation.SeeFigure5formoreinformation.STORMFILTERSYSTEM:AsshowninFigure5,theaccessroadwillbetreatedbyanexistingStormFiltercartridgesystembeforedischargingtoLakeWashingtonthroughtheexistingdischargetunnel.ThecartridgefiltersystemwassizedandinstalledundertheHotelphaseoftheproject,usingthewaterqualitydesignflowrate(35%ofthe2-yrpeakflow)of115.93gpm.PerDOE,each27”cartridgecantreat11.3gpm,resultinginaneedfor11cartridgestotreattherunoff.SeeAppendixAandcivilplansformoreinformation.WATERQUALITYVAULT:Runofffromthedriveway,non-coveredparkingareas,hotelportecochere,andthenorthernstormwatercollectionsystemwillberoutedtoanexistingwaterqualitytreatmentvaultlocatedsoutheastofthehotelsitenearBristol1.Previouscalculations(fromtheMasterPlan)fortheexistingvault•showthatithasthecapacityforfuturebuild-outconditions,whichincludedtheimperviousareasroutedtothevaultinthisproject.SeeAppendixAformoreinformationandcalculations.SOUTHPORTOFFIcE7 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGV.CONVEYANCESYSTEMANALYSISANDDESIGNThissectiondiscussesthecriteriathatwillbeusedtoanalyzeanddesigntheproposedstormconveyancesystem.STANDARDREQUIREMENTS(BASEDONKCSWDMANDSAO):1.Facilitiesmustconveythe100-yearflowwithoutovertoppingthecrownoftheroadway,floodingbuildings,andifsheetflowoccursitmustpassthroughadrainageeasement.Allstormwaterconveyancewillbedesignedsuchthatthe100-yearflowisconveyedwithoutovertoppingthecrownoftheroadway(ordriveaisle)orfloodinganybuilding.2.Newpipesystemsandculvertsmustconveythe25-yearflowwithatleast0.5feetoffreeboard.(1.2.4-1).Thenewpipesystemswillbedesignedtoconveythe25-yearflowwithatleast0.5feetoffreeboard.3.Bridgesmustconveythe100-yearflowandprovideaminimumoftwofeet,varyinguptosixfeet,ofclearancebasedon25%ofthemeanchannelwidth.(1.2.4-2)(4.3.5-6).N/A.Thisprojectdoesnotproposeabridge.4.Drainageditchesmustconveythe25-yearflowwith0.5feetoffreeboardandthe100-yearflowwithoutovertopping.(1.2.4-2).N/AThisprojectdoesnotproposeadrainageditch.5.FloodplainCrossingsmustnotincreasethebasefloodelevationbymorethan0.01feet[41(83.C)]andshallnotreducethefloodstoragevolume[37(82.A)].PiersshallnotbeconstructedintheFEMAfloodway.[41(83.F.1)J.NoworkisbeingproposedwithinthebasefloodelevationorwithintheFEMAfloodway.6.StreamCrossingsshallrequireabridgeforclassIstreamsthatdoesnotdisturborbanks.Fortype2andtype3steams,openbottomculvertsorothermethodmaybeusedthatwillnotharmthestreamorinhibitfishpassage.[60(95.Bfl.Therearenonewstream(river)crossingsassociatedwiththeconstructionofthisproject.7.Dischargeatnaturallocationisrequiredandmustproducenosignificantimpactstothedownstreamproperty(1.2.1-1).Theprojectwilldischargetotheexistingstormsystem.ON-SITECONVEYANCEExistingConditions:RunofffromtheexistingsiteisgenerallycollectedintocatchbasinsviasheetflowandisrouteddirectlytotheoutfalltoLakeWashington.DevelopedStormsystemdescription:RunofffromthebuildingroofwillbecollectedintoroofdrainsandrouteddirectlytoLakeWashingtonviapipeflow.SitewnoffwillgenerallybecollectedbycatchbasinsandtrenchdrainsbeforebeingroutedeitherdirectlytoLakeWashington(NPGIS)ortooneoftwowaterqualitytreatmentfacilities(PGIS)..SOUTHPORTOFFICES COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING•VI.SPECIALREPORTSANDSTUDIESNoneatthistime.SOUTHPORTOFFICE9 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGVII.OTHERPERMITSThisprojectwillrequirebuildinganddemolitionpermitsfromtheCityofRentonandaCSWPPP.SeeSection8fortheCSWPPP(notincludedatthistime)..SOUTHPORTOFFICE10 COUGHLINPORTERLUNDEENSTRLJJRALCIVILSEISMICENGINEERINGVIII.CSWPPPANALYSISANDDESIGNThissectionliststherequirementsthatwillbeusedwhendesigningtheTESCplanforthissite.AcopyoftheDraftCSWPPPhasnotbeenincludedatthistime.AdraftCSWPPPwillbeprovidedbeforepermitisissued.STANDARDREQUIREMENTSErosion/SedimentationPlanshallincludethefollowing:1Facilitiesrequiredinclude:Catchbasinfiltersocks.(1.2.5-1).Theprojectwillprovidesedimentprotectionatexistingandproposedcatchbasins.2.Timing-FortheperiodbetweenNovember1throughMarch1disturbedareasgreaterthan5,000squarefeetleftundisturbedformorethan12hoursmustbecoveredwithmulch,sodding,orplasticcovering.Aconstructionphasingplanshallbeprovidedtoensurethaterosioncontrolmeasuresareinstalledpriortoclearingandgrading.(1.2.5-1).TheTESCplanwillincludeprovisionsfordisturbedareastobecoveredinaccordancewithCityofRentonrequirementsandthatallTESCmeasuresareinplacebeforeanyconstructionactivityoccurs.3.Planning-Planshalllimittributarydrainagetoanareatobeclearedandgraded.Delineatedimension,stakeandflagclearinglimits(1.2.5-1).TheclearinglimitswillbeindicatedontheTESCplan.4.Revegetation-Revegetateareastobeclearedassoonaspracticableaftergrading.(1.2.5-1).NotesaddressingthisitemwillbeincludedontheTESCplan.SOUTHPORTOFFICE11 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIX.BONDQUANTITY,FACILITYSUMMARIES,ANDDECLARATIONOFCOVENANTABondQuantityWorksheetisnotincludedatthistime.AWaterQualityFacilitySummarySheetoutliningtheproposedwaterqualitysystemwillbesubmittedfollowingapprovaloftheplans.AnyrequiredDeclarationsofCovenantwillbeincludedpriortoissuanceofthepermit...SOUTHPORTOFFICE12 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING•X.OPERATIONANDMAINTENANCEMANUALSTANDARDMAINTENANCEPerstandardssetforthintheKingCountySurfaceWaterDesignManual,theownerwillmaintainfacilities.SectionsoftheKingCountyStormWaterManagementDesignManualoutliningtheOperationsandMaintenanceofthesefacilitieshavebeenincludedinthissectiononthefollowingpagesSOUTHPORTOFHCE13 COUGHUNPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGMAINTENANCESTANDARDSFORPRIVATELYMAINTAINEDDRAINAGEFACILITIESATSOUTHPORTOFFICENO.2-CLOSEDDETENTIONSYSTEMS(VAULTS)One-hallofthecrosssectionofaventblockedatanypointwithdebrisandsedimentisDebrisandAccumulatedsedimentdepthexceedsSediment10%ofthediameterofthestorageareafor%lengthofstoragevaultoranypointdepthexceeds15%ofdiameter.Example:72-inchstoragetankwouldrequirecleaningwhensedimentreachesdepthof7inchesformorethan¼lengthoftank.VentsfreeofdebrisandsedimentAllsedimentanddebrisremovedfromstoragearea.ManholeCoverNotinPlaceCoverismissingoronlypartiallyinplace.Anyopenmanholerequiresmaintenance.Manholeisclosed..LockingMechanismNotWorkingMechanismcannotbeopenedbyonemaintenancepersonwithpropertools.Boltsintoframehavelessthan¼inchofthread(maynotapplytoself-lockinglids.)Mechanismopenswithpropertools.CoverDifficulttoRemoveLadderRungsUnsafeOnemaintenancepersoncannotremovelidafterapplying8olbsoflift.Intentistokeepcoverfromsealingoffaccesstomaintenance.KingCountySafetyOfficeand/ormaintenancepersonjudgesthatladderisunsafeduetomissingrungs,misalignment,rust,orcracks.Covercanberemovedandreinstalledbyonemaintenanceperson.Laddermeetsdesignstandardsallowsmaintenancepersonsafeaccess.CatchBasinsSee“CatchBasins”StandardsNo.4See“CatchBasins”StandardsNo.4.StorageAreaMaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedPluggedVentsAirSOuTHPORTOFFICE14 COUGHLINPORTERLUHDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.4-CATCHBASINSTrash&Debris(IncludesSediment)Trashordebrisofmorethan1/2cubicfootwhichislocatedimmediatelyinfrontofthecatchbasinopeningorisblockingcapacityofthebasinbymorethan10%Trashordebris(inthebasin)thatexceeds1/3thedepthfromthebottomofbasintoinvertthelowestpipeintooroutofthebasin.Trashordebrisinanyinletoroutletpipeblockingmorethan1/3ofitsheight.Deadanimalsorvegetationthatcouldgenerateodorsthatcouldcausecomplaintsordangerousgases(e.g.,methane).Depositsofgarbageexceeding1cubicfootinvolumeNoTrashordebrislocatedimmediatelyinfrontofcatchbasinopening.Notrashordebrisinthecatchbasin.Inletandoutletpipesfreeoftrashordebris.Nodeadanimalsorvegetationpresentwithinthecatchbasin.Noconditionpresentwhichwouldattractorsupportthebreedingofinsectsorrodents.StructureDamagetoFrameand/orTopSlabCornerofframeextendsmorethan3/4inchpastcurbfaceintothestreet(Ifapplicable).Topslabhasholeslargerthan2squareinchesorcrackswiderthan1/4inch(intentistomakesureallmaterialisrunningintobasin).Framenotsittingflushontopslab,i.e.,separationofmorethan3/4inchoftheframefromthetopslab.Frameisevenwithcurb.Topslabisfreeofholesandcracks.Frameissiftingflushontopslab.MaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisperformedGeneralSOUTHPORTOFFICE15 COUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.4-CATCHBASINS(CONTINUED)MaintenanceDefectConditionWhenMaintenanceisResultsExpectedComponentsNeededWhenMaintenanceisPerformed.CracksinCrackswiderthan1/2inchandlongerBasinreplacedorBasinWalls!than3feet,anyevidenceofsoilrepairedtodesignBottomparticlesenteringcatchbasinthroughstandards.cracks,ormaintenancepersonjudgesthatstructureisunsound.Crackswiderthan1/2inchandlongerNocracksmorethanthan1footatthejointofanyinletJoutlet1/4inchwideatthepipeoranyevidenceofsoilparticlesjoiniofinletloutletpipe.enteringcatchbasinthroughcracks.Sediment]Basinhassettledmorethan1inchorBasinreplacedorMisalignmenthasrotatedmorethan2inchesoutofrepairedtodesignalignment,standards.FireHazardPresenceofchemicalssuchasnaturalNoflammablegas,oilandgasoline,chemicalspresent.VegetationVegetationgrowingacrossandblockingNovegetationblockingmorethan10%ofthebasinopening.openingtobasin.VegetationgrowingininletioutletpipeNovegetationorrootjointsthatismorethansixinchestallgrowthpresent.andlessthansixinchesapart.PollutionNonflammablechemicalsofmorethanNopollutionpresent1/2cubicfootperthreefeetofbasinotherthansurfacefilm.length.CatchBasinCoverNotinCoverismissingoronlypartiallyinCatchbasincoverisCoverPlaceplace.Anyopencatchbasinrequiresclosedmaintenance.LockingMechanismcannotbeopenedbyonMechanismopenswithMechanismmaintenancepersonwithpropertools.propertools.NotWorkingBoltsintoframehavelessthan1/2inchofthread.CoverDifficultOnemaintenancepersoncannotCovercanberemovedtoRemoveremovelidafterapplying80lbs.oflift;byonemaintenanceintentiskeepcoverfromsealingoffperson.accesstomaintenance.LadderLadderRungsLadderisunsafeduetomissingrungs,LaddermeetsdesignUnsafemisalignment,rust,cracks,orsharpstandardsandallowsedges.maintenancepersonsafeaccess.SOUTHPORTOFFICE16 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMIcENGINEERINGMetalGratesGratewithopeningwiderthan7/8inch.Grateopeningmeets(IfApplicable)designstandards.TrashandTrashanddebristhatisblockingmoreGratefreeoftrashandDebristhan20%ofgratesurface.debris.DamagedorGratemissingorbrokenmember(s)ofGrateisinplaceandMissing.thegrate.meetsdesignstandards.SOUTHPORTOFFICE17 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.7-FENCINGMissingorBrokenPartsErosionAnydefectinthefencethatpermitseasyentrytoafacility.Erosionmorethan4incheshighand12-18incheswidepermittinganopeningunderafence.Partsinplacetoprovideadequatesecurity.Noopeningunderthefencethatexceeds4inchesinheight.WireFencesDamagedPartsPostoutofplumbmorethan6inches.Postplumbtowithin1-1/2inches.Toprailsbentmorethan6inches.Anypartoffence(includingpost,toprails)morethan1footoutofdesignalignment.Missingorloosetensionwire.Extensionarmmissing,broken,orbentoutofshapemorethan11/2inches.Toprailfreeofbendsgreaterthan1inch.Fenceisalignedandmeetsdesignstandards.Tensionwireinplaceandholdingfabric.Extensionarminplacewithnobendslargerthan3/4inch..DeterioratedPaintorProtectiveCoatingPartorpartsthathavearustingorscalingconditionthathasaffectedstructuraladequacy.Structurallyadequatepostsorpartswithauniformprotectivecoating..MaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentsNeededWhenMaintenanceisPerformedGeneralSOUTHPORTOFFICE18 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSUSMICNCINEERINQNO.9-CONVEYANCESYSTEMS(PIPES&DITCHES)MaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedPipesSediment&AccumulatedsedimentthatexceedsPipecleanedofallDebris20%ofthediameterofthepipe.sedimentanddebris.VegetationVegetationthatreducesfreeAllvegetationremovedmovementofwaterthroughpipes.sowaterflowsfreelythroughpipes.DamagedProtectivecoatingisdamaged;rustisPiperepairedorcausingmorethan50%deteriorationreplaced.toanypartofpipe.AnydentthatdecreasesthecrossPiperepairedorsectionareaofpipebymorethanreplaced.20%.OpenDitchesTrash&DebrisTrashanddebrisexceeds1cubicfootTrashanddebrisper1,000squarefeetofditchandclearedfromditches.slopes.SedimentAccumulatedsedimentthatexceedsDitchcleaned/flushed20%ofthedesigndepth.ofallsedimentanddebrissothatitmatchesdesign.VegetationVegetationthatreducesfreeWaterflowsfreelymovementofwaterthroughditches.throughditches.ErosionSee“Raingardens’StandardNo.1See“Raingardens”DamagetoStandardNo.1SlopesRockLiningMaintenancepersoncanseenativeReplacerockstodesignOutofPlaceorsoilbeneaththerocklining,standards.Missing(IfApplicable).CatchBasinsSee“CatchBasins:StandardNo.4See“CatchBasins”StandardNo.4DebrisSee“DebrisBarriers”StandardNo.5See“DebrisBarriers”Barriers(e.g.,StandardNo.5TrashRack)SOuTHPORTOFFICE19 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.10-GROUNDS(LANDSCAPING)Weedsgrowinginmorethan20%ofthelandscapedarea(treesandshrubsonly).Weedspresentinthan5%ofthelandscapedarea.SafelyHazardAnypresenceofpoisonivyorotherpoisonousvegetation.Nopoisonousvegetationpresentinlandscapedarea.TreesandShrubsTrashorLitterDamagedPaper,cans,bottles,totalingmorethan1cubicfootwithinalandscapedarea(treesandshrubsonly)of1.000squarefeet.Limbsorpartsoftreesorshrubsthataresplitorbrokenwhichaffectmorethan25%ofthetotalfoliageofthefreeorshrub.Areaclearoflitter.Treesandshrubswithlessthan5%oftotalfoliagewithsplitorbrokenlimbs.Treesorshrubsthathavebeenblowndownorknockedover.Treesorshrubswhicharenotadequatelysupportedorareleaningover,causingexposureoftheroots.Treeorshrubinplacefreeofinjury.Treeorshrubinplaceandadequatelysupported;removeanydeadordiseasedtrees.GeneralMaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedWeeds(Nonpoisonousless..SOUTHPORTOFFICE20 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.11-ACCESSROADS!EASEMENTSTrashandDebrisTrashanddebrisexceeds1cubicfootper1,000squarefeeti.e.,trashanddebriswouldfilluponestandardssizegarbagecan.Debriswhichcoulddamagevehicletires(glassormetal).Anyobstructionwhichreducesclearanceaboveroadsurfacetolessthan14feet.Anyobstructionrestrictingtheaccesstoa10to12footwidthforadistanceofmorethan12feetoranypointrestrictingaccesstolessthana10footwidth.Roadwayfreeofdebriswhichcoulddamagetires.Roadwayfreeofdebriswhichcoulddamagetires.Roadwayoverheadclearto14feethigh.Obstructionremovedtoallowatleasta12footaccess.RoadSurfaceSettlement,Potholes,MushSpots,RutsWhenanysurfacedefectexceeds6inchesindepthand6squarefeetinarea.Ingeneral,anysurfacedefectwhichhindersorpreventsmaintenanceaccess.Roadsurfaceuniformlysmoothwithnoevidenceofsettlement,potholes,mushspots,orruts.VegetationinRoadSurfaceWeedsgrowingintheroadsurfacethataremorethan6inchestallandlessthan6inchestallandlessthan6inchesapartwithina400-squarefootarea.Roadsurfacefreeofweedstallerthan2inches.MaintenanceDefectConditionWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedGeneralBlockedRoadwaySOUTHPORTOFFICE21 COUGHUNPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.12-WATERQUALITYFACILITIESA.)CartridgeFilterVaultMaintenanceComponentBelowGroundSedimentSedimentdepthexceeds0.25-inches.NosedimentdepositsVaultAccumulationwhichwouldimpedeonMedia.permeabilityofthecompostmedia.SedimentSedimentdepthexceeds6-inchesinNosedimentdepositsinAccumulationfirstchamber.vaultbottomoffirstinVaultchamber.Trash!DebrisTrashanddebrisaccumulatedonTrashanddebrisAccumulationcompostfilterbed.removedfromthecompostfilterbed.SedimentinWhendrainpipes,clean-outs,becomeRemovetheDrainfullwithsedimentand?ordebris,accumulatedmaterialPipes!Clean-fromthefacilities.OutsBelowGroundCompostDrawdownofwaterthroughthemediaReplacemediaCartridgetypeMediatakeslongerthan1hour,and!orcartridges.overflowoccursfrequently.ShortCircuitingFlowsdonotproperlyenterfilterReplacefiltercartridges.cartridges.DamagedAnypartofthepipesthatarecrushed,Piperepairedand?orPipesdamagedduetocorrosionand!orreplaced.settlement.AccessCoverCovercannotbeopened,onepersonCoverrepairedtoproperDamaged!Notcannotopenthecover,corrosion!workingspecificationsorWorkingdeformationofcover,replaced.VaultStructureCrackswiderthan1!2-inchandanyVaultreplacedorIncludesevidenceofsoilparticlesenteringtherepairedtodesignCracksinWall,structurethroughthecracks,orspecifications.Bottom,maintenance!inspectionpersonnelDamagetodeterminesthatthevaultisnotFrameand/orstructurallysound.TopSlabCrackswiderthan1?2-inchatthejointNocracksmorethanofanyinlet/outletpipeoranyevidence1/4-inchwideatthejointofsoilparticlesenteringthevaultoftheinlet!outletpipe.throughthewalls..SOUTHPORTOFFICE22 COUGHLINPORTERLUHDEENSTRUCTLALCIVI..SEISMICENGINEERINGBafflesBafflescorroding,crackingwarping,Repairorreplacebafflesand!orshowingsignsoffailureastospecification.determinedbymaintenance/inspectionperson.AccessLadderLadderiscorrodedordeteriorated,notLadderreplacedorDamagedfunctioningproperly,missingrungs,repairedandmeetscracks,andmisaligned.specincations,andissafetouseasdeterminedbyinspectionpersonnel.SOUTHPORTOFFICE23 .. COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGENGINEERINGREPORTTechnicalInformationReportSouthportOfficeRenton,WAPREPAREDFOR:SECODevelopment1083LakeWashingtonBlvdN,Suite50Renton,WA98056(425)282-5833PREPAREDTHROUGH:ZGFArchitecture925FourthAvenue,Suite2400Seattle,WA90104Phone:(206)623-9414PREPAREDBY:COUGHLINPORTERLUNDEEN801SecondAvenue,Suite900Seattle,WA98104P206.343.0460CONTACT!HartBalko,P.E.ReceivedOCT132015DevelopmentServicesp801SECONDAVENUE.SUITE900SEATTLE,WA98104/P206.313,0460/cplinc.com . pCOUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGTABLEOFCONTENTSI.PROJECTOVERVIEWIGeneralDescription1/4ExistingConditions1ProposedDrainageSystem1II.CONDITIONSANDREQUIREMENTS2SpecialRequirements2ProjectSpecificRequirements3Ill.OFF-SITEANALYSIS4Task1—StudyAreaDefinitionandMaps4Task2-ResourceReview4Task3-FieldInspection4Task4-DrainageSystemDescriptionandProblemDescriptions4UpstreamAnalysis4DownstreamAnalysis5Task5—MitigationofExistingorPotentialProblems5IV.FLOWCONTROLANDWATERQUALITYFACILITYANALYSISANDDESIGN6ExistingSiteHydrology(PartA)6DevelopedSiteHydrology(PartB)6PerformanceStandardsandFlowControlSystem(PartsCandD)6WaterQualitySystem(PartE)7V.CONVEYANCESYSTEMANALYSISANDDESIGN8StandardRequirements(basedonKCSWDMandSAO)8On-siteConveyance8ExistingConditlons8DevelopedStormsystemdescription8VI.SPECIALREPORTSANDSTUDIES9VII.OTHERPERMITS10VIII.CSWPPPANALYSISANDDESIGN11StandardRequirements11////IX.BONDQUANTIW,FACILITYSUMMARIES,ANDDECRATIONOFCOVENANT12X.OPERATIONANDMAINTENANCEMANUAL13StandardMaintenance13AppendixA—Figures24801SECONDAVENUE.SUITE900SEATTLE,WA98104/P206.343.0460/cplinc.Com . ‘7pCOUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING1.PROJECTOVERVIEWGENERALDESCRIPTIONThefollowingpreliminaryTechnicalInformationReport(TIR)providesthetechnicalinformationanddesignanalysisrequiredfordevelopingtheDrainageandTemporaryErosionandSedimentationControlPlan(TESC)fortheSouthportOfficeproject.ThestormwaterdesignfortheprojectwasbasedontherequirementssetforthintheCityofRentonAmendmentstothe2009KingCountySurfaceWaterDesignManual(KCSWDM)(SeeFigure1—TechnicalInformationReportWorksheet)andthe2009KCSWDM.TheSouthportOfficeprojectislocatedwithintheCityofRenton,situatedatthesoutherntipofLakeWashingtontothewestoftheGeneCoulonMemorialBeachPark(SeeFigure3—SiteLocation).ThesiteisintheNW¼oftheNW¼ofSection8,Township23North,Range5East,WillametteMeridian.Thesitewilloccupyparcel0823059216,withanareaof233,210squarefeet.Overall,theprojectwillincludea3-towerofficebuildingandgeneralsiteimprovementsincludinglandscaping,parkingarea,andfireaccessTheexistingsiteconsistsof1.87acresofimperviousareaand3.48acresofpeMousarea.Theproposedconditionswillconsistofapproximately4.95acresofimperviousareaand0.40acresofperviousarea.SoilsfortheareaweremappedusingtheKingCountySoilSurveymaps(SeeFigure7’)8—SoilSurveyMap).0RunofffromthesitewillbedischargeddirectlytoLakeWashingtonviapipeflow.EXISTINGCONDITIONSTheexistingsiteconsistsofasphaltandgravelparkinglotsaswellasopengrassyareas.SeeTableIforsitesurfacecoverinformation.ThesitewaspreviouslyhometotheShuffletonSteamPlant,whichwasbuiltinthe1930’sanddemolishedin2001.Portionsofthesteamplantinfrastructurearestillinplace,includingalargeundergroundconcretevault,whichthisprojectproposestoreusetoprovidewaterqualitytreatmentforrunofffromthesurfaceparkinglot.RefertoSectionIVformoreinformation.PROPOSEDDRAINAGESYSTEMAccordingtoTable1.1.2.AoftheCityofRentonAmendmentstotheKingCountySurfaceWaterManual(COR-SWM),thiaprojectmeetsthecriteriaforaFullDrainageReview,includingflowcontrolandwaterqualityrequirements.Sincetheprojectiswithinabasicwaterqualitytreatmentbasin,BasicwaterqualitytreatmentforrunofffromalltargetpollutiongeneratingsurfaceswillbeprovidedbyeitheroneoftwowetvaultsoracartridgefiltersystembeforebeingdischargedtoLakeWashington.Conveyanceforthesitewillbeacombinationofclosed6to15-inchpipesandsheetflow.Stormwaterrunofffrompollutiongeneratingimpervioussurfaces(PGIS)willbecapturedbyaseriesofcatchbasinsandroutedtotheexistinglargewetvaultonsite.AllconveyanceonsitewillbedesignedaccordingtoChapter4oftheCityofRentonAmendmentstotheKCSWDM.801SECONOAVENUE.SUiTE900SEATTLE,WA98104/P206343.0460/cpilnc.com COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGII.CONDITIONSANDREQUIREMENTSThissectionwilladdresstherequirementssetforthbytheCoreandSpecialRequirementslistedinChapter1oftheCityofRenton’sAmendmentstotheKingCountySurfaceWaterDesignManual.CityofRentonAmendmentstotheKingCountySurfaceWaterManagementDesignManualCoreRequirements:1.DischargeattheNaturalLocation(121):Allrunofffromthesitewillbeconveyedtothenaturaldischargelocation(LakeWashington).2.Off-siteAnalysis(1.2.2):RefertoSectionsIllandIV.ALevel1downstreamanalysishasbeenperformed3.FlowControl(1.2.3.1):RefertoSectionIV.SincetheprojectdischargesdirectlytoLakeWashington,flowcontrolisnotrequired.4.ConveyanceSystem(1.2.4):RefertoSectionV.Closedpipesystemshavebeenprovidedforon-sitestormwaterconveyance.5.ErosionandSedimentationControl(1.2.5):RefertoSectionVIII,Theprojectwillconstructaseriesofsedimentcontrolstoaddressthespecificconditionsatthesite.6.MaintenanceandOperations(1.2.6):RefertoSectionX.Theproposedstormdrainagesystemwillbeowned,operatedandmaintainedbytheowner.7.FinancialGuaranteesandLiability(1.2.7):Theownerandcontractorwillobtainallnecessarypermitsandbondspriortothebeginningofconstruction.8.WaterQuality(1.2.8):RefertoSectionIV.E.Waterqualitytreatmentforrunofffromtargetpollutiongeneratingsurfaceswillbeprovidedbytheexistingwetvaultonsite.SeeSectionIVformoreinformation.SPECIALREQUIREMENTS:SpecialRequirement#1.OtherAdoptedArea-SpecificRequirementsSection1.3.1•CriticalDrainageAreas(CDA5):NotApplicable•MasterDrainagePlans(MDP5):Therearenoknownmasterdrainageplanscoveringthisprojectsite.•BasinPlans(BPS):TheprojectislocatedwithinLowerCedarRiverDrainageBasin.LakeManagementPlans(LMP5):NotApplicableSharedFacilityDrainagePlans(SFDPs):NotApplicableSpecialRequirement#2.FloodHazardAreaDelineation,Section1.3.2:SeeFigure7for100-yrfloodzone.Noworkaffectingthefloodstoragewilltakeplacewithinthe100-yrfloodzone.SpecialRequirement#3.FloodProtectionFacilities,Section1.3.3:NotApplicableSpecialRequirement#4.SourceControls,Section1.3.4:SeeattachedActivityWorksheetandRequiredBMP’s.SpecialRequirement#5.OilControl:Minimaltrafficisanticipatedinthisarea.Nooilcontrolisrequired.SOUTHPORTOFFICE2 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSISMICENGINEERINGPROJECTSPECIFICREQUIREMENTSTherearenoadditionalrequirementsforthisportionoftheproject.DesignandconstructionwillabidebyrequirementssetforthinthesedocumentsandKingCounty.SOUTHPORTOFFICE3 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIII.OFF-SITEANALYSISTASK1—STUDYAREADEFINITIONANDMAPSTheRentondrainagebasinmapwasusedtoverifythatthesitewasfullyintheLowerCedarRiverdrainagebasin(SeeFigure4—DrainageBasinMap).TASK2-RESOURCEREVIEWa)AdoptedBasinPlansLowerCedarRiverDrainageBasinb)Floodplain/floodway(FEMA)MapsSiteisnotlocatedinthefloodplain(SeeFigure7)c)Off-siteAnalysisReportsN/Ad)SensitiveAreasFolioSeeFigures7—KingCountyMAPe)DrainageComplaintsandStudiesSeeFigure91)RoadDrainageProblemsNIAg)KingCountySoilsSurvey:SeeFigure8—CityofRentonSoilSurveyMaph)WetlandInventoryMaps:NoWetlandsi)MigratingRiversStudyN/Aj)DOE’sSection303dListofPollutedWatersN/Ak)KCDesignatedWaterQualityProblemsNoWQProblemsI)CityofRentoncriticalmaps:NoCriticalAreasTASK3-FIELDINSPECTIONSitevisitshavebeenmadetogatherinformationincludingananalysisofthedischargefromthesite.PleaserefertoTask4,DownstreamAnalysisbelowformoreinformation.TASK4-DRAINAGESYSTEMDESCRIPTIONANDPROBLEMDESCRIPTIONSRunofffromthesitewillbeconveyedtoanexistingstormsystemthatdischargesdirectlytoLakeWashington.Theparkingareawillberoutedtotheexistingwetvaultbeforebeingpumpedouttotheexishngstormsystemintheprivateaccessroadtothenortheastofthesite.Similarly,runofffromthebuildingroofandsurroundinghardscapeswillbecollectedandroutedtothesameexistingstormsystem.RoadwayrunoffwillbecollectedinaseriesofcatchbasinsandwillberoutedtoaStormFiltersystempriortodischargetotheexistingstormsystemtothenorthwestofthesite.UpstreamAnalysisThesiteiswithintheLakeWashingtonEastdrainagebasin.Anexistingconveyancepipe,installedaspartoftheHotelatSouthportproject,isroutedthroughthesiteanddischargesrunofftoLakeWashington.ThisexistingbypasspipeconveysrunofffromtheadjacentPSEpropertytothesouth.SOUTHPORTOFFICE COUGHLINPORTERLUNDEENSTRUCTURAtCIV(LStISMICNC(NEER(NCDownstreamAnalysisThesitedischargesdirectlytoLakeWashingtonviaexistingpipeconveyanceandexistingoutfallstothelake.TASK5—MITIGATIONOFEXISTINGORPOTENTIALPROBLEMSTherearenoknownproblemsdrainagecomplaintsdownstreamofthesite(SeeFigure9).Nomitigationisproposed.SOUTHPORTOFFICE5 COUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIV.FLOWCONTROLANDWATERQUALITYFACILITYANALYSISANDDESIGNEXISTINGSITEHYDROLOGY(PARTA)Theexistingsitetotals5.35acresandconsistsofanexistingasphalt/gravelparkinglotandagrassfield.ThesitegenerallyslopestothewestwithdrainagedescribedinSectionIIIDownstreamAnalysis.TheseconditionsaresummarizedinTable1below.TABLE1-EXISTINGSITECONDITIONSAREABREAKDOWNDEScRIPTIONAREA(SQUAREFEET)AREA(ACRES)TOTALPERVIOUSI151,6233.48TOTALIMPERVIOUS81,5871.87TOTALDISTURBEDAREA233,2105.35DEVELOPEDSITEHYDROLOGY(PARTB)Thedevelopedsitehydrologywillincreasetheamountofimperviousareabyapproximately3.08acres.AsummaryofthebasininformationisshowninTable2.TABLE2-DEVELOPEDSITECONDITIONSAREABREAKDOWNDESCRIPTIONAREA(SQUAREFEET)AREA(ACRES)TOTALPERVIOUS2,1970.40TOTALIMPERVIOUS231,013495TOTALDISTURBEDAREA233,210PERFORMANCESTANDARDSANDFLOWCONTROLSYSTEM(PARTSCANDD)AccordingtoSection1,2.3.1(andtheFlowControlBasinMap)oftheCityofRentonAmendmentstotheKCSWM,thisprojectislocatedwithinthePeakFlowControlarea.However,sincethisprojectdischargesdirectlytoLakeWashingtonandsatisfiesalloftheDirectDischargeExemptioncriteria(discussedbelow),flowcontrolisnotrequired.SOUTHPORTOFFICE6 COUGHLINPORTERLUNDEENSTRUCTURALLIVILSEISMICENGINEERINGDirectDischargeExemptionCriteria:A)TheprojectsitedischargestoLakeWashingtonB)Theconveyancesystembetweentheprojectsiteandthemajorreceivingwater(LakeWashington)willextendtotheordinaryhighwatermark,andwillbecomprisedofmanmadeconveyanceelements(pipes)andwillbewithinapublicorprivatedrainageeasement.C)Theconveyancesystemwillhaveadequatecapacitytoconveythe25-yearpeakflow(perCoreRequirement#4,ConveyanceSystem)fortheentirecontributingdrainagearea.D)TheconveyancesystemwillbeadequatelystabilizedtopreventerosionE)Thedirectdischargeproposalwillnotdivertflowsfromorincreaseflowstoanexistingwetlandorstreamsufficienttocauseasignificantadverseimpact.WATERQUALITYSYSTEM(PARTE)Section1.2.8.1(A)oftheCityofRentonAmendmentstotheKCSWDMoutlinesthespecificlanduseswithinBasicWQTreatmentareaswhicharesubjecttoprovidingEnhancedBasicWAtreatment.Beingacommerciallanduse,theSouthportHotelprojectfallsintothecategoryofEnhancedBasicWOTreatment.However,exceptionnumber3ofSection1.2.8.1(A)statesthat“TheEnhancedBasicWQmenuasspecifiedaboveforcertainlandusesmaybereducedtotheBasicWQmenufortreatmentofanyrunoffthatisdischargeddirectly,viaanon-fish-bearingconveyancesystem,allthewaytotheordinarjhighwatermarkofastreamwithameanannualflowof1,000cfsormore(atthedischargepointoftheconveyancesystem)oralakethatis300acresorlarger”SincethisprojectwilldischargerunoffdirectlytoLakeWashington(approximately21,500acres)viaapipedconnection,itwouldfollowthattheprojectisexemptfromprovidingEnhancedBasicWQtreatment.Similarly,the“IntentparagraphofSection1.2.8.1(A)statesthat,“projectsthatdrainentirelybypipetothemajorreceivingwaterslistedonpage1-33[oneofwhichisLakeWashington]areexcusedfromtheincreasedtreatmentandmayreverttotheBasicWQmenubecauseconcentrationeffectsareoflessconcernastheoverallflowvolumeincreases.”Therefore,basicwaterqualitytreatmentforallnewandreplacedpollutiongeneratingimpervioussurfaces(PGIS)willbeprovidedbyeitherawetvaultoraStormFiltercartridgesystem,dependingonlocation.SeeFigure5formoreinformation.STORMFILTERSYSTEM:AsshowninFigure5,theaccessroadwillbetreatedbyanexistingStormFiltercartridgesystembeforedischargingtoLakeWashingtonthroughtheexistingdischargetunnel.ThecartridgefiltersystemwassizedandinstalledundertheHotelphaseoftheproject,usingthewaterqualitydesignflowrate(35%ofthe2-yrpeakflow)of115.93gpm.PerDOE,each27”cartridgecantreat11.3gpm,resultinginaneedfor11cartridgestotreattherunoff.SeeAppendixAandcivilplansformoreinformation.WATERQUALITYVAULT:Runofffromthedriveway,non-coveredparkingareas,hotelportecochere,andthenorthernstormwatercollectionsystemwillberoutedtoanexistingwaterqualitytreatmentvaultlocatedsoutheastofthehotelsitenearBristol1.Previouscalculations(fromtheMasterPlan)fortheexistingvault•showthatithasthecapacityforfuturebuild-outconditions,whichincludedtheimperviousareasroutedtothevaultinthisproject.SeeAppendixAformoreinformationandcalculations.SOUTHPORTOFFIcE7 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGV.CONVEYANCESYSTEMANALYSISANDDESIGNThissectiondiscussesthecriteriathatwillbeusedtoanalyzeanddesigntheproposedstormconveyancesystem.STANDARDREQUIREMENTS(BASEDONKCSWDMANDSAO):1.Facilitiesmustconveythe100-yearflowwithoutovertoppingthecrownoftheroadway,floodingbuildings,andifsheetflowoccursitmustpassthroughadrainageeasement.Allstormwaterconveyancewillbedesignedsuchthatthe100-yearflowisconveyedwithoutovertoppingthecrownoftheroadway(ordriveaisle)orfloodinganybuilding.2.Newpipesystemsandculvertsmustconveythe25-yearflowwithatleast0.5feetoffreeboard.(1.2.4-1).Thenewpipesystemswillbedesignedtoconveythe25-yearflowwithatleast0.5feetoffreeboard.3.Bridgesmustconveythe100-yearflowandprovideaminimumoftwofeet,varyinguptosixfeet,ofclearancebasedon25%ofthemeanchannelwidth.(1.2.4-2)(4.3.5-6).N/A.Thisprojectdoesnotproposeabridge.4.Drainageditchesmustconveythe25-yearflowwith0.5feetoffreeboardandthe100-yearflowwithoutovertopping.(1.2.4-2).N/AThisprojectdoesnotproposeadrainageditch.5.FloodplainCrossingsmustnotincreasethebasefloodelevationbymorethan0.01feet[41(83.C)]andshallnotreducethefloodstoragevolume[37(82.A)].PiersshallnotbeconstructedintheFEMAfloodway.[41(83.F.1)J.NoworkisbeingproposedwithinthebasefloodelevationorwithintheFEMAfloodway.6.StreamCrossingsshallrequireabridgeforclassIstreamsthatdoesnotdisturborbanks.Fortype2andtype3steams,openbottomculvertsorothermethodmaybeusedthatwillnotharmthestreamorinhibitfishpassage.[60(95.Bfl.Therearenonewstream(river)crossingsassociatedwiththeconstructionofthisproject.7.Dischargeatnaturallocationisrequiredandmustproducenosignificantimpactstothedownstreamproperty(1.2.1-1).Theprojectwilldischargetotheexistingstormsystem.ON-SITECONVEYANCEExistingConditions:RunofffromtheexistingsiteisgenerallycollectedintocatchbasinsviasheetflowandisrouteddirectlytotheoutfalltoLakeWashington.DevelopedStormsystemdescription:RunofffromthebuildingroofwillbecollectedintoroofdrainsandrouteddirectlytoLakeWashingtonviapipeflow.SitewnoffwillgenerallybecollectedbycatchbasinsandtrenchdrainsbeforebeingroutedeitherdirectlytoLakeWashington(NPGIS)ortooneoftwowaterqualitytreatmentfacilities(PGIS)..SOUTHPORTOFFICES COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING•VI.SPECIALREPORTSANDSTUDIESNoneatthistime.SOUTHPORTOFFICE9 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGVII.OTHERPERMITSThisprojectwillrequirebuildinganddemolitionpermitsfromtheCityofRentonandaCSWPPP.SeeSection8fortheCSWPPP(notincludedatthistime)..SOUTHPORTOFFICE10 COUGHLINPORTERLUNDEENSTRLJJRALCIVILSEISMICENGINEERINGVIII.CSWPPPANALYSISANDDESIGNThissectionliststherequirementsthatwillbeusedwhendesigningtheTESCplanforthissite.AcopyoftheDraftCSWPPPhasnotbeenincludedatthistime.AdraftCSWPPPwillbeprovidedbeforepermitisissued.STANDARDREQUIREMENTSErosion/SedimentationPlanshallincludethefollowing:1Facilitiesrequiredinclude:Catchbasinfiltersocks.(1.2.5-1).Theprojectwillprovidesedimentprotectionatexistingandproposedcatchbasins.2.Timing-FortheperiodbetweenNovember1throughMarch1disturbedareasgreaterthan5,000squarefeetleftundisturbedformorethan12hoursmustbecoveredwithmulch,sodding,orplasticcovering.Aconstructionphasingplanshallbeprovidedtoensurethaterosioncontrolmeasuresareinstalledpriortoclearingandgrading.(1.2.5-1).TheTESCplanwillincludeprovisionsfordisturbedareastobecoveredinaccordancewithCityofRentonrequirementsandthatallTESCmeasuresareinplacebeforeanyconstructionactivityoccurs.3.Planning-Planshalllimittributarydrainagetoanareatobeclearedandgraded.Delineatedimension,stakeandflagclearinglimits(1.2.5-1).TheclearinglimitswillbeindicatedontheTESCplan.4.Revegetation-Revegetateareastobeclearedassoonaspracticableaftergrading.(1.2.5-1).NotesaddressingthisitemwillbeincludedontheTESCplan.SOUTHPORTOFFICE11 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIX.BONDQUANTITY,FACILITYSUMMARIES,ANDDECLARATIONOFCOVENANTABondQuantityWorksheetisnotincludedatthistime.AWaterQualityFacilitySummarySheetoutliningtheproposedwaterqualitysystemwillbesubmittedfollowingapprovaloftheplans.AnyrequiredDeclarationsofCovenantwillbeincludedpriortoissuanceofthepermit...SOUTHPORTOFFICE12 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING•X.OPERATIONANDMAINTENANCEMANUALSTANDARDMAINTENANCEPerstandardssetforthintheKingCountySurfaceWaterDesignManual,theownerwillmaintainfacilities.SectionsoftheKingCountyStormWaterManagementDesignManualoutliningtheOperationsandMaintenanceofthesefacilitieshavebeenincludedinthissectiononthefollowingpagesSOUTHPORTOFHCE13 COUGHUNPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGMAINTENANCESTANDARDSFORPRIVATELYMAINTAINEDDRAINAGEFACILITIESATSOUTHPORTOFFICENO.2-CLOSEDDETENTIONSYSTEMS(VAULTS)One-hallofthecrosssectionofaventblockedatanypointwithdebrisandsedimentisDebrisandAccumulatedsedimentdepthexceedsSediment10%ofthediameterofthestorageareafor%lengthofstoragevaultoranypointdepthexceeds15%ofdiameter.Example:72-inchstoragetankwouldrequirecleaningwhensedimentreachesdepthof7inchesformorethan¼lengthoftank.VentsfreeofdebrisandsedimentAllsedimentanddebrisremovedfromstoragearea.ManholeCoverNotinPlaceCoverismissingoronlypartiallyinplace.Anyopenmanholerequiresmaintenance.Manholeisclosed..LockingMechanismNotWorkingMechanismcannotbeopenedbyonemaintenancepersonwithpropertools.Boltsintoframehavelessthan¼inchofthread(maynotapplytoself-lockinglids.)Mechanismopenswithpropertools.CoverDifficulttoRemoveLadderRungsUnsafeOnemaintenancepersoncannotremovelidafterapplying8olbsoflift.Intentistokeepcoverfromsealingoffaccesstomaintenance.KingCountySafetyOfficeand/ormaintenancepersonjudgesthatladderisunsafeduetomissingrungs,misalignment,rust,orcracks.Covercanberemovedandreinstalledbyonemaintenanceperson.Laddermeetsdesignstandardsallowsmaintenancepersonsafeaccess.CatchBasinsSee“CatchBasins”StandardsNo.4See“CatchBasins”StandardsNo.4.StorageAreaMaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedPluggedVentsAirSOuTHPORTOFFICE14 COUGHLINPORTERLUHDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.4-CATCHBASINSTrash&Debris(IncludesSediment)Trashordebrisofmorethan1/2cubicfootwhichislocatedimmediatelyinfrontofthecatchbasinopeningorisblockingcapacityofthebasinbymorethan10%Trashordebris(inthebasin)thatexceeds1/3thedepthfromthebottomofbasintoinvertthelowestpipeintooroutofthebasin.Trashordebrisinanyinletoroutletpipeblockingmorethan1/3ofitsheight.Deadanimalsorvegetationthatcouldgenerateodorsthatcouldcausecomplaintsordangerousgases(e.g.,methane).Depositsofgarbageexceeding1cubicfootinvolumeNoTrashordebrislocatedimmediatelyinfrontofcatchbasinopening.Notrashordebrisinthecatchbasin.Inletandoutletpipesfreeoftrashordebris.Nodeadanimalsorvegetationpresentwithinthecatchbasin.Noconditionpresentwhichwouldattractorsupportthebreedingofinsectsorrodents.StructureDamagetoFrameand/orTopSlabCornerofframeextendsmorethan3/4inchpastcurbfaceintothestreet(Ifapplicable).Topslabhasholeslargerthan2squareinchesorcrackswiderthan1/4inch(intentistomakesureallmaterialisrunningintobasin).Framenotsittingflushontopslab,i.e.,separationofmorethan3/4inchoftheframefromthetopslab.Frameisevenwithcurb.Topslabisfreeofholesandcracks.Frameissiftingflushontopslab.MaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisperformedGeneralSOUTHPORTOFFICE15 COUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.4-CATCHBASINS(CONTINUED)MaintenanceDefectConditionWhenMaintenanceisResultsExpectedComponentsNeededWhenMaintenanceisPerformed.CracksinCrackswiderthan1/2inchandlongerBasinreplacedorBasinWalls!than3feet,anyevidenceofsoilrepairedtodesignBottomparticlesenteringcatchbasinthroughstandards.cracks,ormaintenancepersonjudgesthatstructureisunsound.Crackswiderthan1/2inchandlongerNocracksmorethanthan1footatthejointofanyinletJoutlet1/4inchwideatthepipeoranyevidenceofsoilparticlesjoiniofinletloutletpipe.enteringcatchbasinthroughcracks.Sediment]Basinhassettledmorethan1inchorBasinreplacedorMisalignmenthasrotatedmorethan2inchesoutofrepairedtodesignalignment,standards.FireHazardPresenceofchemicalssuchasnaturalNoflammablegas,oilandgasoline,chemicalspresent.VegetationVegetationgrowingacrossandblockingNovegetationblockingmorethan10%ofthebasinopening.openingtobasin.VegetationgrowingininletioutletpipeNovegetationorrootjointsthatismorethansixinchestallgrowthpresent.andlessthansixinchesapart.PollutionNonflammablechemicalsofmorethanNopollutionpresent1/2cubicfootperthreefeetofbasinotherthansurfacefilm.length.CatchBasinCoverNotinCoverismissingoronlypartiallyinCatchbasincoverisCoverPlaceplace.Anyopencatchbasinrequiresclosedmaintenance.LockingMechanismcannotbeopenedbyonMechanismopenswithMechanismmaintenancepersonwithpropertools.propertools.NotWorkingBoltsintoframehavelessthan1/2inchofthread.CoverDifficultOnemaintenancepersoncannotCovercanberemovedtoRemoveremovelidafterapplying80lbs.oflift;byonemaintenanceintentiskeepcoverfromsealingoffperson.accesstomaintenance.LadderLadderRungsLadderisunsafeduetomissingrungs,LaddermeetsdesignUnsafemisalignment,rust,cracks,orsharpstandardsandallowsedges.maintenancepersonsafeaccess.SOUTHPORTOFFICE16 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMIcENGINEERINGMetalGratesGratewithopeningwiderthan7/8inch.Grateopeningmeets(IfApplicable)designstandards.TrashandTrashanddebristhatisblockingmoreGratefreeoftrashandDebristhan20%ofgratesurface.debris.DamagedorGratemissingorbrokenmember(s)ofGrateisinplaceandMissing.thegrate.meetsdesignstandards.SOUTHPORTOFFICE17 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.7-FENCINGMissingorBrokenPartsErosionAnydefectinthefencethatpermitseasyentrytoafacility.Erosionmorethan4incheshighand12-18incheswidepermittinganopeningunderafence.Partsinplacetoprovideadequatesecurity.Noopeningunderthefencethatexceeds4inchesinheight.WireFencesDamagedPartsPostoutofplumbmorethan6inches.Postplumbtowithin1-1/2inches.Toprailsbentmorethan6inches.Anypartoffence(includingpost,toprails)morethan1footoutofdesignalignment.Missingorloosetensionwire.Extensionarmmissing,broken,orbentoutofshapemorethan11/2inches.Toprailfreeofbendsgreaterthan1inch.Fenceisalignedandmeetsdesignstandards.Tensionwireinplaceandholdingfabric.Extensionarminplacewithnobendslargerthan3/4inch..DeterioratedPaintorProtectiveCoatingPartorpartsthathavearustingorscalingconditionthathasaffectedstructuraladequacy.Structurallyadequatepostsorpartswithauniformprotectivecoating..MaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentsNeededWhenMaintenanceisPerformedGeneralSOUTHPORTOFFICE18 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSUSMICNCINEERINQNO.9-CONVEYANCESYSTEMS(PIPES&DITCHES)MaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedPipesSediment&AccumulatedsedimentthatexceedsPipecleanedofallDebris20%ofthediameterofthepipe.sedimentanddebris.VegetationVegetationthatreducesfreeAllvegetationremovedmovementofwaterthroughpipes.sowaterflowsfreelythroughpipes.DamagedProtectivecoatingisdamaged;rustisPiperepairedorcausingmorethan50%deteriorationreplaced.toanypartofpipe.AnydentthatdecreasesthecrossPiperepairedorsectionareaofpipebymorethanreplaced.20%.OpenDitchesTrash&DebrisTrashanddebrisexceeds1cubicfootTrashanddebrisper1,000squarefeetofditchandclearedfromditches.slopes.SedimentAccumulatedsedimentthatexceedsDitchcleaned/flushed20%ofthedesigndepth.ofallsedimentanddebrissothatitmatchesdesign.VegetationVegetationthatreducesfreeWaterflowsfreelymovementofwaterthroughditches.throughditches.ErosionSee“Raingardens’StandardNo.1See“Raingardens”DamagetoStandardNo.1SlopesRockLiningMaintenancepersoncanseenativeReplacerockstodesignOutofPlaceorsoilbeneaththerocklining,standards.Missing(IfApplicable).CatchBasinsSee“CatchBasins:StandardNo.4See“CatchBasins”StandardNo.4DebrisSee“DebrisBarriers”StandardNo.5See“DebrisBarriers”Barriers(e.g.,StandardNo.5TrashRack)SOuTHPORTOFFICE19 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.10-GROUNDS(LANDSCAPING)Weedsgrowinginmorethan20%ofthelandscapedarea(treesandshrubsonly).Weedspresentinthan5%ofthelandscapedarea.SafelyHazardAnypresenceofpoisonivyorotherpoisonousvegetation.Nopoisonousvegetationpresentinlandscapedarea.TreesandShrubsTrashorLitterDamagedPaper,cans,bottles,totalingmorethan1cubicfootwithinalandscapedarea(treesandshrubsonly)of1.000squarefeet.Limbsorpartsoftreesorshrubsthataresplitorbrokenwhichaffectmorethan25%ofthetotalfoliageofthefreeorshrub.Areaclearoflitter.Treesandshrubswithlessthan5%oftotalfoliagewithsplitorbrokenlimbs.Treesorshrubsthathavebeenblowndownorknockedover.Treesorshrubswhicharenotadequatelysupportedorareleaningover,causingexposureoftheroots.Treeorshrubinplacefreeofinjury.Treeorshrubinplaceandadequatelysupported;removeanydeadordiseasedtrees.GeneralMaintenanceDefectConditionsWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedWeeds(Nonpoisonousless..SOUTHPORTOFFICE20 COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.11-ACCESSROADS!EASEMENTSTrashandDebrisTrashanddebrisexceeds1cubicfootper1,000squarefeeti.e.,trashanddebriswouldfilluponestandardssizegarbagecan.Debriswhichcoulddamagevehicletires(glassormetal).Anyobstructionwhichreducesclearanceaboveroadsurfacetolessthan14feet.Anyobstructionrestrictingtheaccesstoa10to12footwidthforadistanceofmorethan12feetoranypointrestrictingaccesstolessthana10footwidth.Roadwayfreeofdebriswhichcoulddamagetires.Roadwayfreeofdebriswhichcoulddamagetires.Roadwayoverheadclearto14feethigh.Obstructionremovedtoallowatleasta12footaccess.RoadSurfaceSettlement,Potholes,MushSpots,RutsWhenanysurfacedefectexceeds6inchesindepthand6squarefeetinarea.Ingeneral,anysurfacedefectwhichhindersorpreventsmaintenanceaccess.Roadsurfaceuniformlysmoothwithnoevidenceofsettlement,potholes,mushspots,orruts.VegetationinRoadSurfaceWeedsgrowingintheroadsurfacethataremorethan6inchestallandlessthan6inchestallandlessthan6inchesapartwithina400-squarefootarea.Roadsurfacefreeofweedstallerthan2inches.MaintenanceDefectConditionWhenMaintenanceisResultsExpectedComponentNeededWhenMaintenanceisPerformedGeneralBlockedRoadwaySOUTHPORTOFFICE21 COUGHUNPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNO.12-WATERQUALITYFACILITIESA.)CartridgeFilterVaultMaintenanceComponentBelowGroundSedimentSedimentdepthexceeds0.25-inches.NosedimentdepositsVaultAccumulationwhichwouldimpedeonMedia.permeabilityofthecompostmedia.SedimentSedimentdepthexceeds6-inchesinNosedimentdepositsinAccumulationfirstchamber.vaultbottomoffirstinVaultchamber.Trash!DebrisTrashanddebrisaccumulatedonTrashanddebrisAccumulationcompostfilterbed.removedfromthecompostfilterbed.SedimentinWhendrainpipes,clean-outs,becomeRemovetheDrainfullwithsedimentand?ordebris,accumulatedmaterialPipes!Clean-fromthefacilities.OutsBelowGroundCompostDrawdownofwaterthroughthemediaReplacemediaCartridgetypeMediatakeslongerthan1hour,and!orcartridges.overflowoccursfrequently.ShortCircuitingFlowsdonotproperlyenterfilterReplacefiltercartridges.cartridges.DamagedAnypartofthepipesthatarecrushed,Piperepairedand?orPipesdamagedduetocorrosionand!orreplaced.settlement.AccessCoverCovercannotbeopened,onepersonCoverrepairedtoproperDamaged!Notcannotopenthecover,corrosion!workingspecificationsorWorkingdeformationofcover,replaced.VaultStructureCrackswiderthan1!2-inchandanyVaultreplacedorIncludesevidenceofsoilparticlesenteringtherepairedtodesignCracksinWall,structurethroughthecracks,orspecifications.Bottom,maintenance!inspectionpersonnelDamagetodeterminesthatthevaultisnotFrameand/orstructurallysound.TopSlabCrackswiderthan1?2-inchatthejointNocracksmorethanofanyinlet/outletpipeoranyevidence1/4-inchwideatthejointofsoilparticlesenteringthevaultoftheinlet!outletpipe.throughthewalls..SOUTHPORTOFFICE22 COUGHLINPORTERLUHDEENSTRUCTLALCIVI..SEISMICENGINEERINGBafflesBafflescorroding,crackingwarping,Repairorreplacebafflesand!orshowingsignsoffailureastospecification.determinedbymaintenance/inspectionperson.AccessLadderLadderiscorrodedordeteriorated,notLadderreplacedorDamagedfunctioningproperly,missingrungs,repairedandmeetscracks,andmisaligned.specincations,andissafetouseasdeterminedbyinspectionpersonnel.SOUTHPORTOFFICE23 .. COUGHLINPORTERLUNDEENCalculationsEngineeringCalculationsEastStormFilterCalcuationsWestStormFilterCalcuationsParkingLotWetvaultSizingCalcuationsTHEHOTELATSOUTHPORT26 . pCOUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGIN_ERING0EngineeringCalculationsCONVEYANCEANALYSIS000/000801SECONDAVENUE,SUITE900SEATTLE.WA98104/P206343.0460/cplinc.com .. Hi.IrI.!l.nt’Li—.H--1--—1—I—4__i_i_WiilfB5Ft.t_cc1irtBASIj3Ntr?tIWIB:BASINA4BASINC4JRIjjfr:]YBASINf’FIii\BASINWIciINH‘;.‘)HZJ?L_LJ%1t<I_..n;HtKpI1”=100’COUGHLINPORTERLUND[EN11_‘r/1/iIL-z__CONVEYANCEBASINMAPSOUTHPORTHOTELSTRUCTURALCIVILSEISMICENGINEERING .. SouthportHotelCatcliBasinSub-basinAreasSub-TotalCompositeImperviousPerviousBasinArea’CValueAreaArea(Acres)(Sq.Fr.),C0.90(Sq.Ft.),C=0.25CB#B90.130.824836661CB#B80.130.7743981151CB#B70.170.7656771563CB#B60.120.7640871074CB#B50.120.854918408CB#BSa0.330.90142380CB#B40.180.887817213CB#B30.120.854680416CB#B20.080.742548666CB#BI0.070.662752161CB#A40.140.9061140CB#A30.140.875633308CB#A20.0000CB#A1(Pumped)0.0000OUTLET0.0000Totals1.71676986821Notes:1.55‘Thcscsub-basinareasarebasedondevelopedsiteconditions.0.16SouthportHotelRenton,WAConveyanceAnalysis3/3/2015- .. 25-YearBackwaterBackwaterAnalysisTableManningsCoefficient0024SnuthporlHotelStormEvcrnRelurnPeriod25ProposedSiteConditionstoVaultLocationQLPipeTYPOutletInletBarrelBarrelVelocityExcelCriticalTWFrictionIIOLEntryEntryExilOutletlleadwatcrInletApproachBendBendJuneLossJunctionIleadwaterRimFlew.O.K.?DownstreamUpstream(cft)(FT)Dium(in).aEJewflewAreaVelocityheadCheckDepthFlewLossFlewCoalLossLossControlDepthConlrolheadCoefficientLossCoefficientLossElewotionO)8crenc,OutletCB8AI(Pumped)3.22II150.024(2.0018.001.2272.6270.1(171(k)0.72(2.99(1.101(9.250.500050.11tQ4t0ffl10.12-0110I0.000.0001(0(9.3021W).70yesCU#AlPumped)CB#A2322450.02412.501275t2’7‘6’?0.11)7(0007’(3490.03414000.500.050.11141606t(3.6(1-0.1100000.00(I(‘0140521.507.45yesC84A2CHqA30.65t0.02411.0011.8003491.85501)531.000.3114,0500779470.500.030.05‘1.550.68(9,26.00500000.00t11109.4921.431,94esCB8A)Cfl#A40356080,02411.8019,400.3490.98901(151.000.2719.490.16520.070500010.0220090.4419.69-0.0200.000.100.1020.1721.000.113yesCB#A2CUllS!2.58isüöihis101.2272.0990.0681.000.6416.100.11317.350.500.030.077,450.5716.81-0,071.330.090.10(1.2117.6921.433.74yesCB#HlCB#522.4848150.0241S—(.2272.0230.0641.000.6317.690,24017.920.500030.06o.ss7,04-0,060.10.010.000.0017.962(543.58yesCUll82C8#832.398515U51T—.2271.9460.059i131r062(7.960,3928.360.500030.06ThW(1.547,42.0.06dTh5ThWo.wDIII)8,3%*t3W3.12vetCUllS)CR5842.2234(5.e—1.127.8080.051L?T0.5911.380.534(8.920.500.030.05(W”0.52111.10.0.05d•iZWQ.%0.0011.94*tW2.56yesCB#84C8885fT•5isaII—(.2271.5700.038uiiiT0.5518.940.22519.170.5001(20.04(9,130,4718.3%4(04d,0.1(019.19*tW2.31yesCB#85CBUB5a‘W7T12a0.7851.0230.016ThUr0.3%19.190.12420.000.500.010.0220.020.409,40.0.02“ôT.01(020.01E3W1.44yesCB#B5CB#66WT•W121’£Pt’I&h3.;0.7851.1790.022“i,iiW0.4019.190.159(9,25.0.500.010.0119.380,4318.56-0.02p000‘,,,s0.004.3621.502(4yesCB#B6CB#B7WT.]W12?8’%‘.te1LI3.I8.0.7850.9530.0(4I.W0.3619.360.16819.53‘‘0.500.010.01(9.550.38It.66-0.01.036wricrs0.0019.5421.832.29yesCB#B7CB#B8‘Th3W’’9’W12a,:*‘18.72.0.7830.6310.006Th.W0.2919.540.09519.72“.0.500.000.0119.730.3019.02-0.01.a0.00,n0.0019.7321.101.37yesCB#BtCB#B9‘O3’T5F’12•‘%t‘:19,50”0.7850.3610,002i,tiW”0.2219.730.02320.600500.000.0020.600.2319.830.00‘.‘..•.ThöW‘Q0.0020,6021.100.50yesSouthportHotelBackwaterAnalysis-25-YearRenton,WA3/3/2015 25-YearConveyanceLocationSubAreaC&ASumTcIQ(R)PipeTyp.SlopeQ(F)VVLTtdinQR/BasinCA(c.f.s.)(pipe(pipe(at/QrFromToNumber(acres)(mm.)(in.)Mannings“n’(fEJft.)full)fill)Q(R))(ft.)(mm.)(%)(%)CB#89CH#B8C8#890.130.820.100.106.32.730.2880.0280.50%0.401.151.091752,769.50%70.9%CB#88CB#87C3#880.130,770.100.209.02.170.50120.0280.50%1.171.491.23891.251.00%42.3%C8#37C8#86CB#870.170.760.130.3310.22.000.75120.0280.50%1.171.491.38300.465.00%64.0%CB#B6C8#85CB#360.120.760.090.4210.51.960.93120.0280.50%1.171.491.47480.575.00%79.1%C8#35aCB#B5CB#35a0.330.900.290.716.32.730.8080.0280.50%0.401.152.30740.599.90%201.1%CB#85CB#B4CB#850.120.850.100.82I1.11.891.93150.0280.50%2.131.741.781010.982.50%90.5%CB484C8#B3C34340.180.880.160.9812.01.802.22150.0280.50%2.131.741.811081.099.90%104.2%CBs33CBSB2CBS330.120.850.101.0813.01.712.39150.0280.50%2.131.741.95850.799.90%112.1%CB#B2CB#B1C8#B20.080.740.061.1413.71.652.48150.0280.50%2.131,742.02480.499.90%116.6%C8#B1CB#A2C8#Bl0.070.860.061.1914.11.622.58150.028‘0.50%2.131.742.10210.299.90%121.0%CBSA4CB#A3CB#A40.140.900.130.136.32.7303580.0281.00%0.561.601.46600.764.00%61.7%CB#A3CB#A2C8#A30.140.870.120.247.02.560.6580.02810.00%1.785.104.0280.047.00%36.4%C8#A2CBSAl(Pumped)CBSA20.000.000.001.4414.31.60322150.0282.00%4.253.463.3640.073.00%75.9%CBSAl(Pumped)OutletCB#AI(Pumped)0.000.000.001.4414,31.603.22150.02854.20%22.1418.0410.18120.030.50%14.6%Project:SouthportHotelR=P(R)=4QCalesby:CJBJobNo:04-0507-01Location:RentonWADale:3/3/2015SouthportHotelRenton,WAConveyanceAnalysis-25Year3/3/2015 100-YearConveyanceLocationSubAreaCCASumTcIQ(ft)PipeTyp.SlopeQW)VVLdIDQR/flasinCA(ci.s.)(pipe(pipe(at/QFFromToNumber(acres)(mm.)—(in.)Mannings“n(ft/ft.)full)fill)0(R))(ft.)(mm.)(%)(%)CB#89C8#88C8#890.130.820.100.106.33.190.33_120.0280.50%1.171.491.071752.741.50%28.3%C8#88CB#B7CB#880,130.770.100.209.02.550.58_120.0280.50%1.171.491.27891.256.50%49.5%C8#87CB#B6CB#370.170.760.130.3310.22.360.88—120.0280.50%1.171.491.45300.372.00%75.0%C8#86CB#BSCR4360,120.760.090.4210.52.311.09120.0280.50%1.171.491.53480.584.50%92.9%CB#35aCB#B5CR4B5a0.330.900,290.716.33.190.94120.0280.50%1.171.491.47740.876.00%80.3%CR435CB#84CR4850.120.850.100.8211.12.242.26150.0280.50%2.131.741.841010.999.90%106.0%CR484CB#B3CR4340.180.880.160.9812.02.132.61150.0280.50%2.131.742.121080.899.90%122.3%CR483CB#B2CR4330.120.850.101.0812.82.042.81150.0280.50%2.131.742.29850.699.90%131.8%CR482CB#B1CB#B20,080.740.061.1413.41.982.92150.0280.50%2.131.742.38480.399.90%137.2%C3#B1CB#A2CB#B10.070.860.061.1913.81.953.03150.028fl.50%2.131.742.47210.199.90%142.5%C8#A4C8#A3C8#A40.140.900.130.136.33.190.4080.0281.00%0.561.601.55600.670.00%72.0%CB#A3CB#A2C8#A30.140.870.120.246.93.000.7680.02810.00%1.785.104.1380.052.00%42.6%CR#A2CB#A1(Pumped)C8#A20.000.000.001.4413.91.94.3.79150.0282.00%4.253.463.5240.082.00%89.2%CRMl(Pumped)OutletIMl(Pump0.000.000.001.4413.91.943.79150.02854.20%22.1418.0410.74120.033.00%17.1%Project:SouthportHotelP(R)=Calesby:CiiiJobNo:Cl4-0507-0lLocation:kentonWADate:3/3/2015SoulhpoftI-Tote]Renton,WAConveyanceAnalysis.100Year3/3/2015 100-YearBackwaterBackwaterAnalysisTableMannlngCfficicnc0.024SouthporlHotelStormEventReturnPeriodIt)))ProposedSiteConditionstoVaultLocationQLPipeTYPOutletInletBarrelBarrelVelocityExcelCriticalTWFrictionIIOLEntryEntryExitOutletIleadwaterInletApproachBendBendJoncLossJunctionileadwalerRimElev.O.K.?DownstreamUpstream(cfs)(Fr)Diam(In).aEIevElevAreaVelocity(leadCheekDepthElevLossElevCodLossLossControlDepthControlIleadCoefficientLossCoefficientLossElevationOItThrr”rcOulIrtCU0.41(Pumped)3.791215ê02412.0018.001,2273.1)9001481.0110.793.0211.141)19.250.500070.15I’)470.9719,22-0.15011.01)0.0001)1)193221.00IhI)VCSCS#AI(Pumj)CBCA23,794(50.02412.5012.751.22730900.1481000.7935200471401)0.500.070.1514220.75(3.69.0.1500000.000tX)140721St7.47C8#A2CUSA)0.76180.0248.0018.800.3492.1710.0731.1(t)(1.414.070.11)69.470.500040.071Q560.759.30.00700.000.000.00lOSt)21.43‘-93yesCS#A3CBsA40.406080.02418.8019,40(1.3391.1550.0211(11)0.30(9.500.22520.070.500010.0220,100.4819.72.0,0200.000.100.122111421.001)61yesCotA2CB#III3.0321150.024(6.101.2272.4730.0951.010.706.830.15617.350.500.050.0917.4’)0,6316.89-0.091.33(1,130.100.25(7.7721.43166yesCUtUICUt1122.9248150.02416.1016.351.2272,3810.08%1.010.6917.770.33218.100,500.040.0918.230.6117.11.0.090.10.0!0.000.0018.1621.543.36esCUt112CDtU)23)1‘—iris‘4’93&‘7i72.28%0,1181‘niir0.6718,160.542(8.700300.040.08iW”0.6017.5041.080“öiiir0.000.008.7421.502.76yesCUtS)COW1142.6113415Th7Tit11]T1.2272.1230.0701]F”0,6518,7411.736(9,470.500.03007flO3W‘0.5718.17.0.0700.000.00OW)19,5121.50(.99yesCR8114CBS11575155N1T9TWi3T’(.84011.053UiW0.6019.51(1311)19,620.500.03Otis‘TWiT—0.526.44.0.05pmtirDM00,00(96521.501.65C5405CUWUSaDM47(2]‘WW‘Th3P3”((960.022lAM0.41l483”(1.16920.010.500.010.0220.050,44(0,44.0.0200.000.000.00200121.50(.47yesCB#B5CU#B6‘t1W”(212T7T’7VILl)0.7851.3830.030‘TnT’-0.44(9.850.22020.060.500.010.0320110.4718.60-0.030-mn—0.00.0020.0821.501,42yesCB#56CB4B7“ô1iiiY(2‘tTh]T18.4’0.7151.1170.019(.0!0.3920.0811.23120.310300.010.0220,340.4218.70.0.020.36‘WffF0.000.0020.3328.83(.50‘tsCB#117CB#B8Th39’ii1E2!’(8.720.7850.7180.008‘9’W0.3220,330.12920,460.500.000.0120.470.3319.054010361W’0.000.0020,4621.83.37yesCU8U8CBPD9“m]r-’9r12‘--‘&r19400.7850.4220.003‘i’—0.2720.460.03120.600.500.000.0020.600.2819.880000ThW0.000.0020.6021.100,50yesSouthportHoldBackwatcrAnalysis-100-YcarRenton,WA3/3/2015 25-YearBackwaterBackwaterAnalysisTableManningsCoefficient0024SnuthporlHotelStormEvcrnRelurnPeriod25ProposedSiteConditionstoVaultLocationQLPipeTYPOutletInletBarrelBarrelVelocityExcelCriticalTWFrictionIIOLEntryEntryExilOutletlleadwatcrInletApproachBendBendJuneLossJunctionIleadwaterRimFlew.O.K.?DownstreamUpstream(cft)(FT)Dium(in).aEJewflewAreaVelocityheadCheckDepthFlewLossFlewCoalLossLossControlDepthConlrolheadCoefficientLossCoefficientLossElewotionO)8crenc,OutletCB8AI(Pumped)3.22II150.024(2.0018.001.2272.6270.1(171(k)0.72(2.99(1.101(9.250.500050.11tQ4t0ffl10.12-0110I0.000.0001(0(9.3021W).70yesCU#AlPumped)CB#A2322450.02412.501275t2’7‘6’?0.11)7(0007’(3490.03414000.500.050.11141606t(3.6(1-0.1100000.00(I(‘0140521.507.45yesC84A2CHqA30.65t0.02411.0011.8003491.85501)531.000.3114,0500779470.500.030.05‘1.550.68(9,26.00500000.00t11109.4921.431,94esCB8A)Cfl#A40356080,02411.8019,400.3490.98901(151.000.2719.490.16520.070500010.0220090.4419.69-0.0200.000.100.1020.1721.000.113yesCB#A2CUllS!2.58isüöihis101.2272.0990.0681.000.6416.100.11317.350.500.030.077,450.5716.81-0,071.330.090.10(1.2117.6921.433.74yesCB#HlCB#522.4848150.0241S—(.2272.0230.0641.000.6317.690,24017.920.500030.06o.ss7,04-0,060.10.010.000.0017.962(543.58yesCUll82C8#832.398515U51T—.2271.9460.059i131r062(7.960,3928.360.500030.06ThW(1.547,42.0.06dTh5ThWo.wDIII)8,3%*t3W3.12vetCUllS)CR5842.2234(5.e—1.127.8080.051L?T0.5911.380.534(8.920.500.030.05(W”0.52111.10.0.05d•iZWQ.%0.0011.94*tW2.56yesCB#84C8885fT•5isaII—(.2271.5700.038uiiiT0.5518.940.22519.170.5001(20.04(9,130,4718.3%4(04d,0.1(019.19*tW2.31yesCB#85CBUB5a‘W7T12a0.7851.0230.016ThUr0.3%19.190.12420.000.500.010.0220.020.409,40.0.02“ôT.01(020.01E3W1.44yesCB#B5CB#66WT•W121’£Pt’I&h3.;0.7851.1790.022“i,iiW0.4019.190.159(9,25.0.500.010.0119.380,4318.56-0.02p000‘,,,s0.004.3621.502(4yesCB#B6CB#B7WT.]W12?8’%‘.te1LI3.I8.0.7850.9530.0(4I.W0.3619.360.16819.53‘‘0.500.010.01(9.550.38It.66-0.01.036wricrs0.0019.5421.832.29yesCB#B7CB#B8‘Th3W’’9’W12a,:*‘18.72.0.7830.6310.006Th.W0.2919.540.09519.72“.0.500.000.0119.730.3019.02-0.01.a0.00,n0.0019.7321.101.37yesCB#BtCB#B9‘O3’T5F’12•‘%t‘:19,50”0.7850.3610,002i,tiW”0.2219.730.02320.600500.000.0020.600.2319.830.00‘.‘..•.ThöW‘Q0.0020,6021.100.50yesSouthportHotelBackwaterAnalysis-25-YearRenton,WA3/3/2015 25-YearConveyanceLocationSubAreaC&ASumTcIQ(R)PipeTyp.SlopeQ(F)VVLTtdinQR/BasinCA(c.f.s.)(pipe(pipe(at/QrFromToNumber(acres)(mm.)(in.)Mannings“n’(fEJft.)full)fill)Q(R))(ft.)(mm.)(%)(%)CB#89CH#B8C8#890.130.820.100.106.32.730.2880.0280.50%0.401.151.091752,769.50%70.9%CB#88CB#87C3#880.130,770.100.209.02.170.50120.0280.50%1.171.491.23891.251.00%42.3%C8#37C8#86CB#870.170.760.130.3310.22.000.75120.0280.50%1.171.491.38300.465.00%64.0%CB#B6C8#85CB#360.120.760.090.4210.51.960.93120.0280.50%1.171.491.47480.575.00%79.1%C8#35aCB#B5CB#35a0.330.900.290.716.32.730.8080.0280.50%0.401.152.30740.599.90%201.1%CB#85CB#B4CB#850.120.850.100.82I1.11.891.93150.0280.50%2.131.741.781010.982.50%90.5%CB484C8#B3C34340.180.880.160.9812.01.802.22150.0280.50%2.131.741.811081.099.90%104.2%CBs33CBSB2CBS330.120.850.101.0813.01.712.39150.0280.50%2.131.741.95850.799.90%112.1%CB#B2CB#B1C8#B20.080.740.061.1413.71.652.48150.0280.50%2.131,742.02480.499.90%116.6%C8#B1CB#A2C8#Bl0.070.860.061.1914.11.622.58150.028‘0.50%2.131.742.10210.299.90%121.0%CBSA4CB#A3CB#A40.140.900.130.136.32.7303580.0281.00%0.561.601.46600.764.00%61.7%CB#A3CB#A2C8#A30.140.870.120.247.02.560.6580.02810.00%1.785.104.0280.047.00%36.4%C8#A2CBSAl(Pumped)CBSA20.000.000.001.4414.31.60322150.0282.00%4.253.463.3640.073.00%75.9%CBSAl(Pumped)OutletCB#AI(Pumped)0.000.000.001.4414,31.603.22150.02854.20%22.1418.0410.18120.030.50%14.6%Project:SouthportHotelR=P(R)=4QCalesby:CJBJobNo:04-0507-01Location:RentonWADale:3/3/2015SouthportHotelRenton,WAConveyanceAnalysis-25Year3/3/2015 100-YearConveyanceLocationSubAreaCCASumTcIQ(ft)PipeTyp.SlopeQW)VVLdIDQR/flasinCA(ci.s.)(pipe(pipe(at/QFFromToNumber(acres)(mm.)—(in.)Mannings“n(ft/ft.)full)fill)0(R))(ft.)(mm.)(%)(%)CB#89C8#88C8#890.130.820.100.106.33.190.33_120.0280.50%1.171.491.071752.741.50%28.3%C8#88CB#B7CB#880,130.770.100.209.02.550.58_120.0280.50%1.171.491.27891.256.50%49.5%C8#87CB#B6CB#370.170.760.130.3310.22.360.88—120.0280.50%1.171.491.45300.372.00%75.0%C8#86CB#BSCR4360,120.760.090.4210.52.311.09120.0280.50%1.171.491.53480.584.50%92.9%CB#35aCB#B5CR4B5a0.330.900,290.716.33.190.94120.0280.50%1.171.491.47740.876.00%80.3%CR435CB#84CR4850.120.850.100.8211.12.242.26150.0280.50%2.131.741.841010.999.90%106.0%CR484CB#B3CR4340.180.880.160.9812.02.132.61150.0280.50%2.131.742.121080.899.90%122.3%CR483CB#B2CR4330.120.850.101.0812.82.042.81150.0280.50%2.131.742.29850.699.90%131.8%CR482CB#B1CB#B20,080.740.061.1413.41.982.92150.0280.50%2.131.742.38480.399.90%137.2%C3#B1CB#A2CB#B10.070.860.061.1913.81.953.03150.028fl.50%2.131.742.47210.199.90%142.5%C8#A4C8#A3C8#A40.140.900.130.136.33.190.4080.0281.00%0.561.601.55600.670.00%72.0%CB#A3CB#A2C8#A30.140.870.120.246.93.000.7680.02810.00%1.785.104.1380.052.00%42.6%CR#A2CB#A1(Pumped)C8#A20.000.000.001.4413.91.94.3.79150.0282.00%4.253.463.5240.082.00%89.2%CRMl(Pumped)OutletIMl(Pump0.000.000.001.4413.91.943.79150.02854.20%22.1418.0410.74120.033.00%17.1%Project:SouthportHotelP(R)=Calesby:CiiiJobNo:Cl4-0507-0lLocation:kentonWADate:3/3/2015SoulhpoftI-Tote]Renton,WAConveyanceAnalysis.100Year3/3/2015 100-YearBackwaterBackwaterAnalysisTableMannlngCfficicnc0.024SouthporlHotelStormEventReturnPeriodIt)))ProposedSiteConditionstoVaultLocationQLPipeTYPOutletInletBarrelBarrelVelocityExcelCriticalTWFrictionIIOLEntryEntryExitOutletIleadwaterInletApproachBendBendJoncLossJunctionileadwalerRimElev.O.K.?DownstreamUpstream(cfs)(Fr)Diam(In).aEIevElevAreaVelocity(leadCheekDepthElevLossElevCodLossLossControlDepthControlIleadCoefficientLossCoefficientLossElevationOItThrr”rcOulIrtCU0.41(Pumped)3.791215ê02412.0018.001,2273.1)9001481.0110.793.0211.141)19.250.500070.15I’)470.9719,22-0.15011.01)0.0001)1)193221.00IhI)VCSCS#AI(Pumj)CBCA23,794(50.02412.5012.751.22730900.1481000.7935200471401)0.500.070.1514220.75(3.69.0.1500000.000tX)140721St7.47C8#A2CUSA)0.76180.0248.0018.800.3492.1710.0731.1(t)(1.414.070.11)69.470.500040.071Q560.759.30.00700.000.000.00lOSt)21.43‘-93yesCS#A3CBsA40.406080.02418.8019,40(1.3391.1550.0211(11)0.30(9.500.22520.070.500010.0220,100.4819.72.0,0200.000.100.122111421.001)61yesCotA2CB#III3.0321150.024(6.101.2272.4730.0951.010.706.830.15617.350.500.050.0917.4’)0,6316.89-0.091.33(1,130.100.25(7.7721.43166yesCUtUICUt1122.9248150.02416.1016.351.2272,3810.08%1.010.6917.770.33218.100,500.040.0918.230.6117.11.0.090.10.0!0.000.0018.1621.543.36esCUt112CDtU)23)1‘—iris‘4’93&‘7i72.28%0,1181‘niir0.6718,160.542(8.700300.040.08iW”0.6017.5041.080“öiiir0.000.008.7421.502.76yesCUtS)COW1142.6113415Th7Tit11]T1.2272.1230.0701]F”0,6518,7411.736(9,470.500.03007flO3W‘0.5718.17.0.0700.000.00OW)19,5121.50(.99yesCR8114CBS11575155N1T9TWi3T’(.84011.053UiW0.6019.51(1311)19,620.500.03Otis‘TWiT—0.526.44.0.05pmtirDM00,00(96521.501.65C5405CUWUSaDM47(2]‘WW‘Th3P3”((960.022lAM0.41l483”(1.16920.010.500.010.0220.050,44(0,44.0.0200.000.000.00200121.50(.47yesCB#B5CU#B6‘t1W”(212T7T’7VILl)0.7851.3830.030‘TnT’-0.44(9.850.22020.060.500.010.0320110.4718.60-0.030-mn—0.00.0020.0821.501,42yesCB#56CB4B7“ô1iiiY(2‘tTh]T18.4’0.7151.1170.019(.0!0.3920.0811.23120.310300.010.0220,340.4218.70.0.020.36‘WffF0.000.0020.3328.83(.50‘tsCB#117CB#B8Th39’ii1E2!’(8.720.7850.7180.008‘9’W0.3220,330.12920,460.500.000.0120.470.3319.054010361W’0.000.0020,4621.83.37yesCU8U8CBPD9“m]r-’9r12‘--‘&r19400.7850.4220.003‘i’—0.2720.460.03120.600.500.000.0020.600.2819.880000ThW0.000.0020.6021.100,50yesSouthportHoldBackwatcrAnalysis-100-YcarRenton,WA3/3/2015 COUGHLINPQRTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGKCRTSSTORMFILTERPEAKFLOWCALCULATIONSEASTSTORMFILTERTIMESERIES:KCRTSProgram...FileDirectory:C:\KCSWDM\KCDATA\[C]CREATEanewTimeSeriesST0.000.000.000000TillForest0.000.000.000000TillPasture0.010.0C0.000000TillGrass0.000.000.000000DutwashForest0.000.000.000000DutwashPasture0.000.000.000000DutwashGrass0.000.000.000000Wetland0.370.000.000000:mperviousEASTSF.tsf1.00000FWESTSTORMFILTERTIMESERIES:[C]CREATEanewTimeSeriesST0.000.000.000000TillForesc0.000.000.000000TillPasture0.170.000.000000TillGrass0.000.000.000000OutwashForest0.000.000.000000OutwashPasture0.000.000.000000OutwashGrass0.000.000.000000Wetland1.550.000.000000ImperviousWESTSF.tsfT1.00000F801SECONDAVENUE,SUITE900SEATTLE,WA98104/P206.343.0460/cpIinc.com rr’zzzrzCOUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGEASTSTORMFILTERFLOWFREQUENCYANALYSISTimeSeriesFile:eastsf.tsfProjectLocation:Sea-Tac-——AnnualPeakFlowRates———FlowFrequencyAnalysiFlowRateRankTimeofPeak——Peaks-—RankReturnProb(CFS)(CFS)Period0.17668/27/0118:000.4421100.000.9900.12389/17/0217:450.336225.000.9600.336212/08/0217:150.239310.000.9000.14278/23/0414:300.19845.000.8000.188510/28/0416:000.18853.000.6670.198410/27/0510:450.17662.000.5000.239310/25/0622:450.14271.300.2310.44211/09/086:300.12381.100.091ComputedPeaks0.40650.000.980WESTSTORMFILTERFLOWFREQUENCYANALYSISTimeSeriesFile:westsf.tsfProjectLocation:Sea—Tac———AnnualPeakFlowRates———FlowFrequencyAnalysiFlowRateRankTimeofPeak——Peaks——RankReturnProb(CFS)(CFS)Period0.73868/27/0118:001.911100.000.9900.51689/17/0217:451.43225.000.9601.43212/08/0217:151.01310.000.9000.59578/23/0414:300.83645.000.8000.792510/28/0416:000.79253.000.6670.836410/27/0510:450.73862.000.5001.01310/25/0622:450.59571.300.2311.9111/09/086:300.51681.100.091ComputedPeaks1.7550.000.980.2 COUGHLINPORTERLUND[ENSTRUCTURALCIVILSEISMICENGINEERINGEastStormFilterCalculations2-yearstormflow(perKCRTSreport,attached)0.176CFS=79.0gpm35%of2-yearstormflow(perICCSWMM6.5.5.1.2):27.65gpmCartridgesRequired(perKCSWMMTable6.5.5.A,below):(4)18”Cartridges=30gpmdesignflow>27.65gpmTABLE6.5.5AMAXIMUMSTORMFILTERDESIGNFLOWRATESBASICTREATMENTWITHZPGMEDIAEffectiveCartridgeHeight(inches)CartridgeFlowRate(gpmlcartridge)PERCARTRIDGEFOR801SECONDAVENUE!SUITE900SEATTLE,WA98104/P206343.0460/cplinc.com VIpii‘4COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGWestStormFilterCalculations2-yearstormflow(perKCRTSreport,attached):D.738CFS=331.23gpm35%of2-yearstormflow(perKCSWMM6.5.5.1.2):115.93gpmCartridgesRequired(perKCSWMMTable6.5.5.A,below):(11)27”Cartridges=124.3gpmdesignflow>115.93gpmTABLE6.5.S.AEffectiveCartridgeHeight(inches)MAXIMUMSTORMFILTERDESIGNFLOWRATESPERCARTRIDGEFORBASICTREATMENTWITHZPGMEDIACartridgeFlowRate(gpm/cartridge)60iSECONDAVENUE,SUiTE900SEATTLE,WA96101/P206,3430460Icplinc,Com pCOUGHLINPORTERLUNDEENCTURALCIVILSEISMICENGINEERINGSouthportWetvaultSizingCalculationsFollowingtheprocedureoutlinedin6.4.1.1oftheKingCountyStormwaterDesignManual:Step1:Identifyrequiredwetpoolvolumefactorf=3(sincebasic)Step2:Determinerainfall(R)forthemeanannualstormUsingFigure6.4.1,4,R=0.47”=0.039’Step3:CalculaterunofffromthemeanannualstormVr=R(O.9A1+o.ZSA+o.loA,,+o.o1A)=190,000SFAg=0.00SF///A1=0.00SFA0=0.00SF=(0.039FT)(0.9)(190,000SF)Vr6,669CFStep4:CalculaterequiredwetpoolvolumeVb=fVr=(3)(6,669CF)Vb=20,007CFWithinsidedimensionsof178.5’x25’,andalivestoragedepthof4.8,theprovidedvolumeoftheexistingvaultisapproximately21,420CF,so,21,420CF>20,007CF“provided>VrequjreTherefore,theexistingvaultisadequateforreuseasawetvaulttoprovidebasicwaterqualitytreatment.//0Additionally,theexistingwetvaultmustmeettherequirementsofCityofRentonAmendmenttoKCSWDMSection6.4.2./pPROJECT---DESIGNEDBYDATE—---3OJECTNUMBERCLIENTCHECKEDBY-SHEETOF—00801SECONDAVENUE,SUITEoooSEATTLE,WA98104/P206.343.0460/cpiInc.com .. 1tZz0wr00ZuUDzJwUIz0—U_Izo‘14.’In‘IIINScII‘C’‘3IifC,,atmH-AC,,0<-JOHatH-J<Iwo(90-70-CNHC,,—owu‘I‘34.N‘111‘0‘3:1.4-0-.4—.4a)4.,tU.1’-oa)C04a)0-41%1%tQ13.r4’I’‘3I&a2rr-4‘a.3V.IitS0aC’a41a(*4-0Ua)a)-C-I,m:3u9a)mU”,0>0S0“CCo‘hEw3qK-3i-c-I‘*-UUa)2C-UJPOH1DPOJui1iRno31,661IlIuxdoz——a-—-a-————— 2/14/013:37:34pmCoughlin,Porter,LundeenInc.SOUTHPORTC990570-01page1WATERQUALITYDESIGNStormFilterFlowsQBASINSUMMARYBASINID:WQVaultSBUHMETHODOLOGYTOTALAREARAINFALLTYPE....:PRECIPITATION....:TIMEINTERVAL..ABSTRACTIONCOEFF:PEAKRATE:NAME:64%2yrPrecip-4.33AcresBASEFLOWS:TYPE1AWQStorm0.00cfsPERVIMP0.00Acres4.33Acres86.0098.006.30mm6.30mm7IID63EXISTINGWETVAULTCALCULATlONS;.FROM2001SOUTHPORTMASTERPLAN/1.28inches10.00mm0.20AREA..:TC..1.06cfsVOL:0.38Ac-ftTIME:480mmI 0II,z00zLi//I.1’//P0..,I/\C.(N!jhII—.ch!44us-,N11I.•‘i1i—I-—t..?4qev,g--2001SQUTHPORTMASTERPLANIM$TRflIWATERQUAUIVTh&IARYMEA-—HSOUTHPORTINFRASTRUCTURE .. II%.1‘CtPROPOSEDPGISIF4’-I.4zzC93,927SF=2.16ACMASTERPLANPGISpSF=2.82AC<2.82AC0T//1ir:;jI41ILIIriLiiiIIII[IIflIIEII .. COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGAppendixA—FiguresII0/00801SECONDAVENUE.SUITE900SEATTLE,WA98104IP206343.0460/CpIinC.Com/VA .. KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart1PROJECTOWNERANDPROJECTENGINEERProjectOwnerSECODevelopmentPhone(425)282-5833Address1083LakeWashingtonBIvd,SuiteSORenton,WA98056ProjectEngineerBartBalko,P.ECompanyCoughlinPorterLundeenPhone206-343-0460Part3TYPEOFPERMITAPPLICATIONLILanduseServicesSubdivison/ShortSubd.IUPDLIBuildingServicesMIF/CommericalISFRLIClearingandGradingLIRight-of-WayUseIOtherSPRPart2PROJECTLOCATIONANDDESCRIPTIONProjectNameSouthportOfficeDDESPermit#LocationTownship23NRangeSESection8SiteAddressPart4OTHERREVIEWSANDPERMITSLIDFWHPALIShorelineLICOE404ManagementLIDOEDamSafetyLIStructuralRockeryNaulU_____LIFEMAFloodplainLIESASection7LICOEWetlandsLIOtherPart5PLANANDREPORTINFORMATIONTechnicalInformationReportTypeofDrainageReviewIFullIITargetedI(circle):LargeSiteDate(includerevisionAttached.dates):DateofFinal:SiteImprovementPlan(Engr.Plans)Type(circleone):Full/ModifiedISmallSiteDate(includerevisiondates):DateofFinal:Part6ADJUSTMENTAPPROVALSType(circleone):Standard/Complex/Preapplication/Experimental!BlanketDescription:(includeconditionsinTIRSection2)DateofApproval:2009SurfaceWaterDesignManualFigureI-TIRWorksheet KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart7MONITORINGREQUIREMENTS...MonitoringRequired:Yes/NoDescribe:StartDate:CompletionDate:Part8SITECOMMUNITYANDDRAINAGEBASINCommunityPlan:GreenRiverValleySpecialDistrictOverlays:DrainageBasin:LakeWashingtonEastDrainageBasinStormwaterRequirements:Part9ONSITEANDADJACENTSENSITIVEAREASLIRiver/StreamLISteepSlopeLakeWashingtonLIErosionHazardLIWetlandsLILandslideHazardUClosedDepressionLICoalMineHazardLIFloodplainLISeismicHazardLIOtherLIHabitatProtectionLIPart10SOILSSoilTypeSlopesErosionPotentialLoosenon-silty/siltysand0-5%Mediumstiffsilt&clayMediumstiffsiltLIHighGroundwaterTable(within5feet)LISoleSourceAquiferLIOtherLISeeps/SpringsLIAdditionalSheetsAttached2009SurfaceWaterDesignManual21/9/2009 KINGCOUNTY,WASHINGTON,SURFACEWATERDESLGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart11DRAINAGEDESIGNLIMITATIONSREFERENCELIMITATION/SITECONSTRAINTUCore2—OffsiteAnalysisUSensitive/CriticalAreasUSEPAOtherSeeSectionIV-DownstreamAnalysisSeeSectionIV-DownstreamAnalysisU__________________UAdditionalSheetsAttachedPart12TIRSUMMARYSHEET(provideoneTIRSummarySheetperThresholdDischargeArea)ThresholdDischargeArea:SouthportOfficeSite(nameordescription)CoreRequirements(all8apply)DischargeatNaturalLocationNumberofNaturalDischargeLocations:I(LakeWashington)OffsiteAnalysisLevel:Q/2/3dated:Seeattachedreport.FlowControlLevel:1/2I3orExemptionNumber3of1.2.8.1(A)(md.facilitysummarysheet)SmallSiteBMPsConveyanceSystemSpillcontainmentlocatedat:N/AErosionandSedimentControlESCSiteSupervisor:ContactPhone:TBDAfterHoursPhone:MaintenanceandOperationResponsibility:IPrivatel/PublicIfPrivate,MaintenanceLogRequired:YesFinancialGuaranteesandProvided:IwillbeprovidedpriortoconstructioniLiabilityWaterQualityType:IBasic1/Sens.Lake/EnhancedBasicmIBog(includefacilitysummarysheet)orExemptionNo.LandscapeManagementPlan:YesINoSpecialRequirements(asapplicable)AreaSpecificDrainageType:CDAISDO/MDPIBPILMP/SharedFac.INonelRequirementsName:Floodplain/FloodwayDelineationType:Major/Minor/Exemption/INoneI100-yearBaseFloodElevation(orrange):Datum:FloodProtectionFacilitiesDescribe:SourceControlDescribelanduse:(comm.Iindustriallanduse).Seeattachedreport.Descnbeanystructuralcontrols:2009SurfaceWaterDesignManual1/9/20093 KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETOilControlHigh-useSite:YesIj’9TreatmentBMP:MaintenanceAgreement:YesINowithwhom?OtherDrainageStructuresDescribe:Part13EROSIONANDSEDIMENTCONTROLREQUIREMENTSMINIMUMESCREQUIREMENTSMINIMUMESCREQUIREMENTSDURINGCONSTRUCTIONAFTERCONSTRUCTIONClearingLimitsLIStabilizeExposedSurfacesLICoverMeasuresRemoveandRestoreTemporaryESCFacilitiesPerimeterProtectionCleanandRemoveAllSiltandDebris,EnsureLITrafficAreaStabilizationOperationofPermanentFacilitiesSedimentRetentionLIFlagLimitsofSAOandopenspaceLIpreservationareasSurfaceWaterCollectionOtherLIDewateringControlLIDustControlFlowControl—Part14STORMWATERFACILITYDESCRIPTIONS(Note:IncludeFacilitySummaryandSketch)FlowControlType/Description—WaterQualityType/DescriptionLIDetentionLIBiofiltrationLIInfiltrationLIWetpoolLIRegionalFacilityMediaFiltrationStormFilterMHLISharedFacilityLIOilControlLIFlowControlLISpillControlBMPsLIFlowControlBMPsLIOtherLIOther.2009SurfaceWaterDesignManual41/9/2009 KINGCOUNTY,WASHINGTON,SURFACEWATERDESIGNMANUALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETLIDrainageEasementLICovenantPan15EASEMENTS/TRACTSPart16STRUCTURALANALYSISLINativeGrowthProtectionCovenantLITractLIOtherLICastinPlaceVaultLIRetainingWallLIRockery>4’HighLIStructuralonSteepSlopeLIOtherPart17SIGNATUREOFPROFESSIONALENGINEERI,oracivilengineerundermysupervision,havevisitedthesite.ActualsiteconditionsasobservedwereincorporatedintothisworksheetandtheattachedTechnicalInformationReport.Tothebestofmyknowledgetheinformationprovidedhereisaccurate.Siqned/Date2009SurfaceWalerDesignManual51/9/2009 KingCounty0823059216ElectoralDistrictsVotingdistrictKingCountyCouncildistrictCongressionaldistrictLegislativedistrictSchooldistrictSeattleschoolboarddistrictDistrictflrnjrtelectnraldistrictKingCountyplanningKingCountyzoningDevelopmentconditionsComprehensivePlanUrbanGrowthAreaCommunityServiceAreaCommunityPlanningAreaCoalminehazards?Erosionhazards?Landslidehazards?Seismichazards?DrainageBasinWatershedWRIAPLSSLatitudeLongitudeNA,checkwithjurisdiction__________NonedoesnotapplyUrbandoesnotapplyGreenRiverValleyNonemappedNonemappedNonemappedNonemappedFiredistrictWaterdistrictSewerdistrictWater&SewerdistrictParks&RecreationdistrictHospitaldistrictRurallibrarydistrictPotentialannexationareaRuraltown?WaterserviceplanningareaRoadsMPSzoneTransportationConcurrencyManagementForestProductiondistrict?AgriculturalProductiondistrict?Criticalaguiferrechargearea?100-yearfloodplain?Wetlandsatthisparcel?WithintheTacomaSmelterPlume?doesnotapplyNodoesnotapply111andll2doesnotapplyNoNoNonemappedNonemappedNonemappedNon-Detectto20.0ppmEstimatedArsenicConcentrationInSoil.Figure2-ParcelCondition]KingCountyDistrictsandDevelopmentConditionsforparcel0823059216ParcelnumberAddressJurisdictionZipcodeKrollMappageThomasGuidepageNotAvailableRenton98056309and3l9626EastLakeWashington-RentonandWater-LakeWashingtoncedarRivenLakeWashingtonCedar-Sammamish(8)NW-8-23-547.5021-122.20551[RNT37-0991Districts,DaveUpthegrove(206)477-1005937Renton#403doesnotapply(notinSeattle)Southeast__________andcriticalareasdesignationsdoesnotapplydoesnotapplydoesnotapplydoesnotapplydoesnotapplyPublicHospitalDistrictNo.IRuralKingCountyLibrarySystemkin.Thisreportwasgeneratedon3/31/201512:47:08PMContactusatgiscenterãkingcounty.gov.©2010KingCounty COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING£zI”‘U0z-J0az-lxU181•I—xiSa’i-.‘rojectSiteProjectSouthportOfficeDesignedBy:CJBDate:ProjectNo:CI40194-I2Client:ZGFCheckedBy:BSBSheet---1Figure3-SitiLocationi801SECONDAVENUE,SUITE900SEATTLEWA98104P:206/343-0460F:206/343-5691wwwcplinccom COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERING‘4-1t.,—TcfSOUTHPORTHOTELPROJECTI(UNDERSEPARATEPERMIT)—Ir-_1,—E°HIE}‘4ti4—tøiiL)EXISTINGGRAVELLOTh/v.ajI/I/øw0gj—,—_41_1r)iri4/OUSAR9__H_ROADTOBECONSTRUCTED‘c7[Lrr----vsFigure4-ExistingConditionH111=1o0ProjectSouthportOfficeProjectNo:C140194-12Client:ZGFDesignedBy:CJBCheckedBy:BSBDate:SheetUCzCzz-12zU0U20U/)801SECONDAVENUE.SUITE900SEATTLEWA98104ft206/343-0460F:2061343-5691www.cplinc.com COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGIINEWPGISROUTEDTOEXWATERQUALITYVAULT,r-{TORF1LTERCARTRIDGESEXPGISROUTEDTOEXCLEANRUNOFFTODISCHARGETOEX.STORMSEWERJ1TSProjectSouthportOfficeProjectNo:C140194-12ClientZGFDesignedBy:CJBCheckedBy:BSBDate:SheetU£SOUTHPORTHOTELPROJECT(UNDERSEPARATEPERMIT)SOUTHPORTOFFICEI•NEWPGISROUTEDIINTERALLYTOEX]____*QUALITYVAULT-rataS—tL--tr;FigureSProposedConditions801SECONDAVENUE,SUITE900SEATTLEWA98104P:206/343-0460F:206/343-5691www.cplinccom . PointofDischargetoLakeWashingtonProjectLocation-LowerCedarRiverBasin . Reference11-Aatr—.A‘FSE72ndSI3fEeOthStNewc:ueWa.çc1FlowControlStandard______PeakRateFlowControlSIFlowControlDurationStatFlowControlDurationStatA;’LakeWashingtonwCoC)-CCo—cii/FloodProblemFlowUnincorporatedKingCow,RentonCityLimitsPotentialAnnexationAreaECTSITECu,ItILSW7thSt/fl“I’—Q153./.I!ILRi’‘N\va’‘IA-1-405FWVSW27thSt0Liza)>(UwA9,C)a)Coa)a)(UVa)xcCC34thSt-QICN .. 3Q1’ tb C n pa 24 68t11AvEs p.,’p.rLI’ owt0 C,w -4 w-4‘a n LOGN1 AW N WILLIA!Ac AVE N I PARK AVE N GARDEN 2 El AVE N ‘a NaAY FGOV tô4 0.9 PASKAcN 0’ El 2 El — N 3AV MDCV]i’g m -4 JONES AVE NE zI, ElI4TEREYAVENE a-4 aIn ‘V Cl] -4 2m C, 1 z ‘a 1 NCG I.OUC 2 t ‘a — ---S— tLt r 2m 2I” p KENNEWtXAVE NE 2I” El 2U’ ABERDEEI4 AVE NE- asti E AW NE rn I’, -4z Co-4 2 2 AVE NC El JNMVSVIWDCMIASAVCNCCMIASA’Jc NC 2 -4 iMAPLegend•/CountyBoundaryStreetsADrainageStudies•NeighborhoodDrainagenOsiari,isProjectsjLad•RegionalStormwaterFacilitiesParcels•ResidentialStormwater100YearFloodplainFacilitiesLakesandLargeRivers•CommercialStormwaterStreamsFacilitiesKighwaysTheInlonnationincludedonthismaphasbeancompiledbyKInoCountystaff1mmavarietyofsourcesandIssubjecttochangewithoutnotice,KingCountymakesnorepresentationsorwarranties,expressorlmptld,astoacwracy,completeness,tImeliness,orrightstotheuseofsuchInformation.ThisdocumentIsnotIntendedforuseasasurveyproduct.Kin9Countyshallnotbeliableforanygeneral,special,Indirect,Incidental,orconsequentialdamagesincluding,butnotlimiLedto,lostrevenuesorlostprofitsresultingfromtheuseormisuseoftheInformationcontainedonthismap.Anysaleof.tthismaporInformationonthismapIsprohibitedexceptbywrittenpermIssionofKIngCounty.Date:3131/2015Source:KingCountyMAP’Stonnwater(http2Awni.metrokc.gov/GISIIMAP) U) C Di 7c Co C0C ‘C CDDi Di00 CD 0 . z flZ’17 itT W . 0 0 it UI -i S -s I z r r 0 •2r IZitTW zDi C Di COo0- Di = m C -5 CD c-fl 2. c-fl C CD -v 12r ‘trw z Ia izrw I Nz SoilMap—KingCountyArea.WashingtonMAPLEGENDMAPICRAreaofInterest(Aol)SpoilAreaThesoilsurveysthatcompriseyourflAreaofInterest(Aol)CStonySpotWarning:SoilMapmaynotbevalidSoilsVeryStonySpotEnlargementofmapsbeyondthescLiSoilMapUnitPolygons•1,WetSpotmisunderstandingofthedetailofm....SoilMapUnitLinesplacement.ThemapsdonotshowOthersoilsthatcouldhavebeenshownatSoilMapUnitPoints.SpecialLineFeatures---SpecialPointFeaturesPleaserelyonthebarscaleoneaciWaterFeaturesBlowoutmeasurements.Streamsandcanals0BorrowPitSourceofMap:NaturalResourceTransportationWebSoilSurveyURL:htlp:/JwebtXClaySpotj_j_iRailsCoordinateSystem:WebMercatcoClosedDepressionInterstateHighwaysMapsfromtheWebSoilSurveyareGravelPitprojection,whichpreservesdirectiorUSRoutesdistanceandarea.AprojectionthatGravellySpot-MajorRoadsAlbersequal-areaconicprojection,0LandfillLocalRoadscalculationsofdistanceorareaareA..LavaFlowBackgroundThisproductisgeneratedfromtheLtheversiondate(s)listedbelow.MarshorswampAerialPhotographySoilSurveyArea:KingCountyAr*MineorQuarrySurveyAreaData:Version10,StoMiscellaneousWaterSoilmapunitsarelabeled(asspace-0PerennialWaterorlarger..RockOutcropDate(s)aerialimageswere<gn2013SalineSpotTheodhophotoorotherbasemap::SandySpotcompiledanddigitizedprobablydiffi..SeverelyErodedSpotimagerydisplayedonthesemaps.Iofmapunitboundariesmaybeevid0SinkholeSlideorSlipSodicSpottJSti\NaturalResourcesWebSoilSurveyaConservationServiceNationalCooperativeSoilSurvey SoilMap—KingCountyArea,WashingtonMapUnitLegendLT0talSforAreaofInterestUSIJANaturalResourcesConservationServicei100.0%5.0100.0%iKingCountyArea,Washington(WA633)MapUnitSymbolMapUnitNameAcresinAOlPercentofAol•UrUrbanland5.0WebSoilSurveyNationalCooperativeSoilSurvey3/31/2015Page3of3 N2BDISTNE2RT)ISTESTNE27ThCTNEZEnISTNTHSTJINMn1STtozLaN£fltlaNE2’Then141C,LakeWashingtonz‘IiCNESTNEJfllST‘aUNEirna“INE15THsr0NE16ThSTtotoUINE1CNSTle/lQrII!i¾Ii/a’zflInztorNE17tHSTiI--NE1GflIR.He/NUNOSIGWAYNE10111STlINETNN8111512NW8THNEThNE8ThaSTz‘UNETJFfSrIIST(CpZKiigCoutN6ThSTzusN5Th___—N411TherloimahonindLedonthismapnasocenCovr4ymakesrrep1esenta3itsorwananties,expresscc..ThE*osnwnlisnotinter4edhruseasasurveyp,t.Kifdamagesincluding,butnotlimitedto,lostrevenuesOr051pthismaporinformationonthismapIsprohibitedexceptbywriavarietyofsourcessitisstkecIto-.__10-DrainageComDtaintsMapDaLe:3131/2015Source:KinoCountyiMAP- iMAPLegendICountyBoundarySfteetsDrainageStudiesF1•NeighborhoodDrainagesfProjectsLoalRegionalStormwaterFacilities—ParcelsLakesandLargeRivers•ResidentialStormwaterFacilitiesStreams•CommercialStormwater.DrainageComplaintsFacilitiesHighways1sInformationincludedonthismaphasbeencompdedbyKingCountysiallfromavarietyofsourcesandIssubjecttochangewithoutnotice.KingCountymakesnorepresentationsorwarranties,espressorimphed,astoaccuracy,completeness.ilmellness,orrightstotheuseofsuchInformation.ThisdocumentIsnotintendedto,useasasurveyproduct.Kin9Countyshallnotbeliableforanygeneral,special,rnciirect,Incidental,orconsequentialdamagesIncluding,butnotlimitedto.lostrevenuesorlostprofitsresultingfromtheuseormisuseofiheInfonnarioncontainedonthismap.Anysaleof.I(tthismaporinlormatlononthismapIsprohibitedesceptbywrittenpermissionofKingCounty.1fl9OUfl31Date:313112015Source:KingCountyiMAP-Storrowater(httpi%wv.meimkc.govIGlSIlMAP) . COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGAppendixBGEOTECHNICALREPORTGeotechnicalEngineeringDesignStudy,SouthportHotelPreparedforSecoDevelopmentbyHartCrowser,IncDatedApril18,2014THEHOTELATSOUTHPORT27 .. ag_.a—GeotechnicalEngineeringDesignStudySouthportOfficeDevelopmentRenton,WashingtonPreparedforSECODevelopmentMay1,201519014-04MWMsHARTCROWSERI-I- celebratingccasHARTcROWSERosc[;icaEngineeringDesignStudySouthportOfficeDevelopmentRenton,WashingtonPreparedforSECODevelopmentMay1,201519014-0411*BriceExley,PEProjectGeotechnicalEngineer1700VVSSI1UcI:jisN771.51115IDSea:tto,W.st,jncloi,907096212Fa2063285581lel206.32.79520.PreparedbyHartCrowser,Inc./11*7/,i8,cDavidWinter,PE,LEEDAPVicePresident ContentsPURPOSEANDSCOPEOFTHISSTUDYISITEANDPROJECTDESCRIPTIONIGroundwaterError!Bookmarknotdefined.GEOTECHNICALENGINEERINGCONCLUSIONSANDRECOMMENDATIONS2GeneralConsiderationsErrorlBookmarknotdefined.GeotechnicalRecommendationsSupportingStructuralDesign2SeismicDesignIssues2ReuseoftheExistingTimberPiles3PileFoundationDesign4FloorSlabDesign6Below-GradeWallsandStructuralFill6GeotechnicalRecommendationsSupportingCivilDesign6RoadwayandUtilitySettlementandConstructability6TunnelsBeneaththeRoadways7UnderslabDrainageforBuildings7SiteDrainageUtilities8PavementSupport9StructuralFill9UseofOn-SiteSoilasStructuralFill10ExcavationGroundwaterControl11RECOMMENDEDADDITIONALGEOTECHNCIALSERVICES11GroundwaterMonitoringandPumpingTests.11DrivenPileLoadTests.11ServicesduringConstruction.12USEANDLIMITATIONSOFTHISREPORT12TABLES12012IBCSeismicDesignParametersn£119014-04HzrnTcnowsznMay1,2015 iiContentsFIGURES1VicinityMap2SiteandExplorationPlan3SubsurfaceCrossSectionA-A’4SubsurfaceCrossSectionB-B’SLiquefactionAssessment6LPILESoilSite1Results:16-Inch-DiameterAugercastPileFixedHead3rdRowandHigherSpacing7LPILESoilSite2Results:16-Inch-DiameterAugercastPileFixedHead3rdRowandHigherSpacing8LPILESoilSiteSResults:16-Inch-DiameterAugercastPileFixedHead3rdRowandHigherSpacing9PileCapPassivePressureLoad-DeformationCurvesAPPENDIXAFieldExplorationsMethodsandAnalysisAPPENDIXBHistoricalHartCrowserExplorationsandLaboratoryTestingAPPENDIXCHistoricalExplorationsbyOthersATTACHMENTIConePenetrationTestData.n19014-04AlMay1,2015UIJUcRO$JSER GeotechnicalEngineeringDesignStudySouthportOfficeDevelopmentRenton,WashingtonPURPOSEANDSCOPEOFTHISSTUDYThepurposesofthisstudywereto:•Assesssubsurfaceconditions;•Establishfoundationdesigncriteriatosupportthestructuralengineer;•Developspecificsiteuserecommendation5tosupportthecivilengineer;and•Providegeotechnicalengineeringrecommendationsforconstruction.Thescopeofthisstudyincluded:•Newfieldexplorationsconsistingofcorepenetrometerprobes;•AreviewofearlierworkatthesitecompletedbyHartCrowser,Inc.,datedApril9,1999;•AreviewofearlierworkatthesitecompletedbyGeotechConsultants,Inc.,(Geotech)datedDecember15,2000;•Identificationandanalysisofthegeotechnicalengineeringcon5iderations;and•Preparationofthisreport.Ourfieldexplorationsconsistedofsixconepenetrationtests(CPTs;HCCPT-1throughHCCPT-6).Inaddition,wereviewedthelogsoffivemudrotaryborings(B-ithroughB-5)andeightconepenetrationtests(CPT-1throughCPT-8}fromthepreviousHartCrowserandGeotechstudies.Finally,weperformedgeotechnicalanalysistodeveloprecommendationsfordesignandconstruction.SITEANDPROJECTDESCRIPTIONThesiteisonthesouthernedgeofLakeWashington,inRenton,Washington,asshownonFigure1.Theprojectconsistsofthree9-storyofficetowers,apodium,andacommongarage.Thegarageisessentiallyatgrade,althoughsomeareasrequirelimitedexcavationtoachievefinalgrades.AsiteandexplorationplanshowingtheapproximatelocationofthesoilboringsandconepenetrationtestsisonFigure2.Threedistinctsubsurfacesiteconditionswereobserved,andareshadedasSoilSites1through3onthefigure.NewHartCrowsersoilexplorationsaredescribedinAppendixA,existingHartCrowsersoilexplorationsandlaboratorytestinginAppendixB,andhistoricalexplorationsandtestinginAppendixC.CPTdataareprovidedinAttachment1.Figures3and4showsubsurfacecrosssectionsbasedonthenewandhistoricalsoilexplorations.n19014-04HsRTcRowsE.nMay1,2015 2IContentsThedepthto,andthicknessof,thesoillayersvarygreatlythroughoutthesite,asdiscussedlaterinthisreport.Groundwaterlevelinourexplorationswasabout5feetbelowexistinggradeforHCCPT-2through6,andabout10feetforHCCPT-1,whichwasatahigherelevationthantheotherCPTs.Thesegroundwaterlevelswereidentifiedatthetimeoftheexplorations,butgroundwaterlevelsareaffectedprimarilybythelevelofLakeWashington,whichvariesbyonlyabout3feetannually.Thegroundwatergradientisfromsouthorsoutheasttonorthornortheast,asgroundwaterflowsfromtheuplandareastowardthelake.GEOTECHNICALENGINEERINGCONCLUSIONSANDRECOMMENDATIONSThefollowingsectionincludesdesigncriteriaaddressingsitepreparation,structuraldesignissues,civildesignissues,andseismicdesign.Thesedesigncriteriaarebasedontheprecedingsitedescription,appliedloadsasprovidedbythedesignteam,andthesubsurfaceconditionsrevealedbytheexplorationscompletedatthesite.Subsurfacesoilconditionsweredeterminedfromexplorationsatdiscretelocationsatthesite.Soilpropertiesinferredfromthefieldandlaboratorytestsformedthebasisfordevelopingourgeotechnicalrecommendationsinthisreport.Thenatureandextentofvariationsbetweentheexplorationsmaynotbecomeevidentuntilconstructionbegins.Ifvariationsthenappear,itmaybenecessarytore-evaluatetherecommendationsinthisreport.Asthedesigncriteriacontinuetoevolve,weneedtocontinuetoconsultwiththeteamsothatourrecommendationsremaincurrent.Thefoundationschemewillconsistofdeepfoundationelements(likelydrivengroutpiles),withastructuralslabconnectingthepilecapsasfoundationsupport.Groundimprovementshouldoccurundertheentirebuildingfootprinttomitigateliquefactionanddecreasethepotentialmagnitudeofsoilsettlementfollowingaseismicevent.GeotechnicalRecommendationsSupportingStructuralDesignSeismicDesignIssuesBasedondatafromexplorationsatthesite(sixbyHartCrowserandfivebyGeotech),wehaveconcludedthattheaverageshearwavevelocityandnatureofsitesoilsintheupper100feetjustifyanInternationalBuildingCodesoilprofilesiteclassD,ifliquefactionismitigated.Thisisbasedonmeasuredandestimatedshearwavevelocitiesfromacrossthesite.Thecalculatedaverageshearwavevelocityintheupper100feetisbetween600and700feetpersecond(fps),orjustabovethe600fpscutoff.Thisdoesnottakeintoaccountthebenefitsresultingfrominstallingearthquakedrains.Currently,thereisariskofliquefactionofthesitesoilsduringasignificantseismicevent,asshownonFigureS.Widespreadliquefactioncouldresultingroundsurfacesettlementbothbelowthebuildingsn19014-04MSMay1,2015IJJIJflrJ?OIaJSER Contents3andintheaccessareasaroundthebuildings.Giventhesettlement-pronenatureofthesite,evenifgroundimprovementtechniquesareused,werecommendthatundersiabutilitiesbehungfromtheslaband/orgradebeamsratherthangrade-supported.Exteriorpavements,walkways,utilities,andgrade-supportedstructuresaresubjecttodistressfromliquefactionandmaynotfunctionafteramajorseismicevent.Foundationpilesforthebuildings(ifused)shouldbelargelyunaffected,exceptthattheymaynotbedesignedforlateralresistanceorfrictionalsupportintheliquefactionzone.Thepreferredgroundimprovementmethodforthesitetoreducetheareasofpotentialliquefactionisearthquakedrains.Becauseoffinescontent,someoftheliquefiablesoilsmaynotbemitigatedbyearthquakedrains,sootherimprovementmethodsmightberequiredindiscreteareas;suchasrammedaggregatepiers,stonecolumns,orvariousgroutingmethods.Evenifnogroundimprovementstepsaretaken,installingdrivenpilesateachcolumnlocationwillmakethesoildenserandwilllikelyfurtherreducetheextentofliquefaction.BuildingCodeSeismicParametersTable1provides2012InternationalBuildingCode(BC)seismicdesignparametersforthesitelatitudeandlongitudeandthesoilSiteClass.TheparameterswereobtainedfromtheUSGSUSSeismicDesignMapswebapplication(http://earthquake.usgs.gov/designmaps/us/application.php)accessedonApril30,2015.Table1—2012IBCSeismicDesignParametersParameterValueLatitude47.50533Longitude-122.19981SiteClassDRiskCategoryI,II,IllSpectralResponseAccelerationatShodPeriods,SsMappedMCEGeometricMeanPeakGroundExistingTimberPilesApproximately3,500timberpilesareinplacetosupportvariouselementsassociatedwiththesteamplant.Thecurrentplanistoextractthepilesandnotusethemforstructuralsupport.Ifthepilesarerequiredasverticalsupportelementsgoingforward,furthertestingthroughaload-testingprogramwillberequiredtoverifytheintegrityandcapacityofthepiles.nMl19014-04MaV1,2015Htarcnowsst 4ContentsPileFoundationDesignWerecommendusingonlydrivenpilesatthesitefortworeasons:(1)itiseasiertoidentifythesometimesirregularbearingLayerifthepilesaredrivenratherthandrilled,and(2)thedrivingprocesswillincreasethesoildensityandreducethepotentialforliquefaction.Consideringtheload-carryingrequirements,appropriatetypesofdrivenpilesaretheDeWittdrivengroutpileandprecastconcrete.Pilelengthswillvaryfrom60to75feetacrossthesite.Forplanning,werecommendassuminganaveragelengthof70feet.Becausethesupportingsandlayerisoflimitedthickness,wewillputlimitsonthedrivingandpenetrationlengthstoavoidpunchingthroughthelayer.Thesepileswilllikelynotbedriventorefusal.Basedonpreviousloadtestsandcurrentanalyses,werecommendanallowablecapacityof135tonsfor16-inch-diameterdrivengroutpiles60to70feetlongforthemajorityofthesite.TheCPTsattheextremenortheast(SoilSite2)andsouthwest(SoilSite3)portionsofthesiteencounteredsignificantlydifferentsoilprofilesthanacrossmostofthesite.ThepileswithinSoilSite2haveanallowablecapacityofapproximately120tonswithinthedesigndepth.TheexplorationswithinSoilSite3encounteredathick,deeplayerofsiltandclay.Pilesinthisareaofthesitewillrequireapproximately90feetofembedmenttominimizedifferentialsettlementbetweenSoilSites1and3,andtoattainacapacityof135tons.Theinstallationofgroundimprovementwilllikelyresultinaminorincreaseinthepileresistance.Withgroundimprovement,thelossoffrictionanddowndragfromliquefactionwillbeminimal.Asthepreviousloadtestingdidnotincludeinstrumentationofthepile,itisnotpossibletodistinguishthepiletipresistancefromtheshaftresistance.Giventheuncertaintyinthis,werecommendanallowableupliftresistanceof50tonsacrossthesite.Allcapacitiesmaybeincreasedby1/3duringtransientwindandseismicloads.Basedonpreviousloadtestsatthesite,weanticipatethedrivengroutpileswillhavesettlementcharacteristicsincompressionsimilartothoseofaspringwithastiffnessof920kips/inch,andtheirtensionresponsewillbehavesimilartoaspringwithastiffnessof300kips/inch.Soilsbelowthebearinglayerarelooseinmanyareas.Inaddition,acompressiblesoilzoneexistsatdepthsofabout100to120feetinsomelocations,asdisclosedbyseveraloftheexplorations.Weestimatethatthepilescouldexperienceaninitialcompressionofasmuchas1inchasthebuildingloadsareapplied.Overseveralmonthsfollowingconstruction,anadditional1-1/2to2inchesofdeep-seatedsailconsolidationandbuildingsettlementcouldoccur.Wedonotexpectthisconsolidationtoresultinabruptdifferentialsettlement,butportionsofthestructurebuiltatdifferenttimescouldexperiencedifferentialsettlement.LateralPileCapacityLateralresistanceanddeflectionsofverticalpilefoundationsareoftengovernedbythelateralcapacityofnear-surfacesoilsandthestrengthofthepileitself.Thedesignlateralcapacityoftheverticalpileswilldepend,toalargeextent,ontheallowablelateraldeflectionsofthepiles.Note,MW19014-04aMay1,2015HORTcROWSER Contents5however,thatifnogroundimprovementiscompleted,undersevereseismicloadingthepileswillexperienceminimallateralresistanceinthezoneofliquefaction.Figure5,7,and8providetheanticipatedpileresponsetoloadingfor16-inch-diameterdrivengroutpileswith3Dspacingwiththemaximumappliedaxialload.Theappliedcompressiveloaddecreasestheallowabledeflectionbyinducinganadditionalbendingmomentwithinthepile.Discussionswiththestructuralengineerhaveindicatedthedrivengroutpileshaveanallowablebendingmomentcapacityofapproximately800kip-inches.TheresultsinFigure6,7,and8arebasedondeformationcompatibilitywithinthepilecap.Thedesignhasrequiredlimitingtheallowabledeformationtothatofthepilerowthatreachestheallowablebendingmomentatthesmallestdeformation,andcalculatingthepileloadingresponseforeachotherrowatthatlimitingdeformation.Developmentoflateralpilecriteriarequiresthestructuralengineertoassumethedegreeoffixityatthepilehead.Apileisconsideredfree-headedifthetopisfreetorotate.Ifthetopofthepileisfixedagainstrotationbyembedmentinapilecapthatissufficienttodevelopafixed-endmoment,thepileisconsideredrestrainedandfixed-headed.Itisourunderstandingthatthepilesarecurrentlybeingdesignedunderafixed-headcondition.Thepilecap,upondeflection,willcontributesomelateralresistancetothefoundationsystem.Theequivalentfluidweightforpassiveresistanceofcompactedfillabovethegroundwatertableis450poundspercubicfoot(pcf),andbelowthegroundwatertableitis250pcf.Thisisanultimatevaluethatassumesthepilecapcanmovelaterallyatleast1percentofitsheight(heightdefinedasdepthfromadjacentgradetothebottomofthepilecap).Forlesslateralmovement,theultimatepassiveresistanceshouldbeinterpolatedfromthecurvesonFigure9.ThecurvesonFigure9assumetopsofthepilecapsareapproximately5feetabovethegroundwatertable.Thelateralresistanceagainstthepilecapassumestheconfiningsoiliscompactedstructuralfill.PileInstallationWerecommendthefollowing:•Spacepileswithingroupsnocloserthan3timesthepilediameteroncenter.•Giventheinstallationmethodsofdrivengroutpiles,verifythecapacityofatleasttwopilespersoilsitecondition,andofnolessthan2percentoftheproductionpiles,byhighstraindynamictestingwithsignalmatching(PDAandCAPWAP).Thiscanbecompletedbystrikingtheinstalledpilewithapiledrivinghammerfollowinginstallationandsetup,orbyapplyingadropweighttothepileheadsuchasGRL’sAPPLEsystem.•Tocorrespondtotheallowabledesignvalue,applyafactorofsafetyof2.5totheultimatepilecapacityasdeterminedbyhighstraindynamictesting.HartCrowsershouldreviewthepileplansandspecifications,andestimatethedesignpilelengthspriortoconstruction(andorderingpiles,ifprecastconcreteareused).Asnotedearlier,alengthof70feetSWIS19014-04HsRTcROwszRMay1,2015 6Contentsisappropriateforplanning(exceptinSoilSite3),andthelengthsinthefieldwillbecarefullymonitoredtoprotectagainstoverdrivingandpunchingthroughthebearinglayer.FloorSlabDesignForthepilefoundationsupportalternative,werecommenddesigningthefloorslabasastructuralslab,supportedbythepilecapsandgradebeams.Asrecommendedbelowtheslabshouldbeunderlainbyatleast3inchesofopengradedstoneaboveatleast6inchesofwell-gradedsandorsandandgravelwithafinescontentofnomorethan3percentbyweight.Avaporbarrierisnotrequired.Below-GradeWallsandStructuralFillWallsbackfilledononesideonlycanbedesignedusingsoilpressuresestimatedusingequivalentfluidweightsforthesoil.Foractiveconditions,wherethewallisfreetodeflectslightly,theappropriatefluidweightis35pcf.Forpassiveresistanceabovethegroundwatertable,theappropriatefluidweightis425pcf;belowthegroundwatertable,itis250pcf.Forat-restconditions,wherenodeflectionisallowed,theappropriatefluidweightis55pcf.Theseequivalentfluidweightsassumealevelbackfill,nosurcharges,andproperdrainagebehindthewall.Structuralfillwillberequiredinsomeareasaroundthesite.Generally,thestructuralfillshouldconsistofclean,well-gradedsandorsandandgraveltoallowplacementandcompactionunderwetconditions.Compactionto95percentofthemodifiedProctormaximumdrydensityisrequiredinbearingareas.Lowercompactionlevelsareacceptableinnon-bearingareas.Forexample,inpavedareas,alevelof92percentisacceptable.Inlandscapedareas,88to90percentisacceptable.Beneathstructuralslabs,thefillneedsonlybecompactenoughtosupportthecuringslab.Crushedconcretecanbeusedasfillbelowstructuralslabs,andatdepthsgreaterthan2feetbelowtheslabinslab-on-gradeareas.Crushedconcreteshouldhaveamaximumsizeof4inches.Wallswithsoilbackfilledononesidewillrequiredrainage,ormustbedesignedtowithstandfullhydrostaticpressure.Werecommendthefollowing:•Backfillwithaminimumthicknessof18inchesofwell-graded,free-drainingsand(lessthan3percentfinesbasedontheminus3/4-inchfraction)orsandandgravel.•Installdrainsbehindanybackfilledsubgradewalls.Drainswithcleanoutsshouldincorporateaminimum4-inch-diameterperforatedpipesurroundedbyatleast6inchesofwell-graded,free-drainingsand(lessthan3percentfinesbasedonminus3/4inchfraction),orsandandgravel.Thedrainsshouldbeslopedtocarrythewatertoasumporothersuitabledischarge.IThebackfillshouldbecontinuousandshouldenvelopthedrainagebehindthewall.GeotechnicalRecommendationsSupportingCivilDesignRoadwayandUtilitySettlementandConstructabiityAsmuchas8feetoffillwillbeplacedtoconstructroadwaysaroundthesite,potentiallyresultingintime-dependentsettlementsofasmuchasabout2inches.Tomitigatethesettlement,theroadwayn19014-04MMMay1,2015HARTO?OWSER Contents7fillareascouldbepreloaded,probablyforabout3to4months,orsurcharged,forashortertime,dependingontheheightofthesurcharge.Ourunderstandingofthescheduleisthatsuchtimeisnotconsistentwithothersiteneeds.AnotheralternativecouldbetheuseofalightweightembankmentfillcalledGeofoam.Thismaterialissuppliedinblocksorsheetsandisstrongenoughtosupportsomefillandpavementloadings.Weneedtotalktovendorsaboutitsapplicationhere.Utilitieswillsettlewiththesurfaceofthefill,sincethesettlementisdeep-seated.Ifthefillisplacedfirstandtheutilitiesafter,someoftheutilitysettlementwillbeeliminated.Utilityconnectionsshouldbeasflexibleaspossible,andutilitygradesandslopesshouldbeadjusted,asappropriate,toadapttotheexpectedsettlement.Belowthegroundwatertable(estimatedtobeashighaselevation17and19feet,orabout3feetbelowthecurrentsitegrade),ourabilitytodewatersufficientlytoallowforastabletrenchandworkableconditionsisuncertain,OldphotographsofconstructionatthesteamplantandourexperienceatPaccarandatthehotelsitesuggestthatthegroundwatercanbecontrolledusingwellpointsorwells,plussheetpilecutoffwalls.Ifthisisthecase,thenatraditionaltrenchboxtosupporttheexcavation,combinedwithareadewatering,couldbecost-effectiveandefficient.Ifthewatercannotbecontrolled,morecostlyalternativessuchasgroundfreezingmayneedtobeconsidered.Ineithercase,thepipebeddingandbackfillshouldconsistofhighqualitysandandgravelwithalowfinescontent,sincetheworkwillbecompletedinwetconditions.Awell-gradedsandandgravelcanevenbeplacedwithsomewaterintheexcavation.Ifthebottomoftheexcavationisinpeatorsoftsilt,whichtheexplorationsindicateispossible,aseparationfabricshouldbeusedtolinethepipetrenchandkeepthecleanbeddingandbackfillfrombecomingcontaminatedwithfine-grainedsoil.TunnelsBeneaththeRoadwaysThetunnelsthatapparentlywillextendbeneaththeroadwaysdonotneedtobefilled,inouropinion.Iftheyarefilledwithatypicalmaterialsuchassoil,CDF,constructiondebris,orleanmixconcrete,theweightwillinitiatenewsettlement.Rather,werecommendcappingthetunnelswithastructuralmembercapableofsupportingtheweightoftheoverlyingfillandtrafficloading.Alternatively,anon-organiclightweightfillcouldbeused(anorganicfill,suchaswoodchips,couldbreakdownovertime,producingpotentiallyexplosivegases).UndersiabDrainageforBuildingsWerecommendthatnounderslabdrainnetworkbeinstalledforeitherapilefoundationorastonecolumn/spreadfootingfoundationsystem.Insupportofdrain-basedgroundimprovementmethods,andduetothehighgroundwatertable,theslabshouldbeunderlainbyatleast3inchesofopengradedstoneaboveatleast6inchesofwell-gradedsandorsandandgravelwithafinescontentofnomorethan3percentbyweight,basedontheminus3/4-inchfraction.Perimeterdrainsanddrainsatthebaseofbelow-gradewallswillstillbeneeded.n1*19014-04HCRTO?OWSERMay1,2015 8IContentsSiteDrainageFinalgradesshouldbeslopedtocarrysurfacewaterrunoffawayfromstructurestopreventwaterfrominfiltratingnearthefoundationwalls.Roofdrainageandnewsurfacewaterdrainageshouldnotbetiedintothesubdrainsystemandshouldnotdischargeontothesite.UtilitiesThecompressiblesoilsaredeeperthanthetypicaldepthofburiedutilities;therefore,utilitiesplacedunderareasofraisedgrademaysettlealongwiththenewfill.Inareaswherethegradewillberaisedabovethecurrentgroundsurface,werecommendinstallingutilitiesafterplacingthebackfilltoreducetheamountofutilitysettlement.Areasofimprovedgroundwillsettlelessthanareaswithoutgroundimprovement.Utilityconnectionsshouldbeasflexibleaspossible,andutilitygradesandslopesshouldbeadjusted,asappropriate,toadapttotheexpectedsettlement.Forshallowutilities,weanticipatethatopen-cuttrenchesand/ortrenchboxescouldbeusedforutilitytrenchexcavations.Forplanningpurposes,werecommendthattemporaryunsupportedopen-cutslopesbedesignedinaccordancewithcurrentWISHArulesandregulationsforaTypeCsoil.Notethatunshoredcutsdeeperthan4feetwillneedtobesloped;cutsshallowerthan4feetdonotrequiresloping.Duringwetweatherexcavation,theslopesshouldbeprotectedfromsloughinganderosion.Thecontractorshouldbemaderesponsibleforthestabilityofalltemporaryexcavation,groundsettlementandassociateddamagetonearbystructures,andworkersafety.Asnotedpreviouisly,excavationsdeeperthan3to5feetcouldencountergroundwater.Dependingonthepreciselocationofutilities,deleteriousmaterialsuchasconcrete,wood,stumps,andotherdebrismaybeencountered.Weanticipatethatthemajorityoftheutilityexcavationscouldbecompletedwithconventionalearthworkequipment.Inaddition,excavationsmustconformtofederal,state,andlocalsafetyregulations.Ourrecommendationsforbeddingandtrenchbackfillmaterialsarepresentedbelow.TheminimumpercentcompactionrecommendedbelowisapercentageofthemodifiedProctormaximumdrydensityasdeterminedbytheASTMD1557testprocedure.SAtleast4inchesofbeddingisrecommendedforallutilitypipes.Werecommendthatbeddingmaterialsconsistofwell-gradedsandandgravelwithlessthan3percentmaterialpassingtheNo.200sieve(basedontheminus3/4-inchfraction).Beddingmaterialshouldbecompactedusingcarenottodamagetheutilitypipes.•Therecommendedbeddingbackfillmaterialscanbeusedasbackfillaroundthepipeutilities(pipezonebackfill).Pipezonebackfillshouldextendtoatleastthetopofthepipe.•Forbeddingmaterialbeneathcatchbasinsandmanholes,werecommendatleast5inchesofimportedstructuralfill(oracceptableon-sitematerial)thatconsistsofwell-gradedsandandgravelwithlessthan3percentpassingtheNo.200sieve(basedontheminus3/4-inchfraction).Thebeddingmaterialshouldbecompactedtoatleast90percent.n19014-04ISMay1,2015IISRTcR0ws.ER Contents9SIfthebottomoftheexcavationisinpeatorsoftsilt,whichtheexplorationsindicateispossible,aseparationfabricshouldbeusedtolinethepipetrenchandkeepthecleanbeddingandbackfillfrombecomingcontaminatedwithfine-grainedsoil.CompactionEquipment.Generallywerecommendusinghand-operatedcompactionequipmentwithin12inchesofanypipe,catchbasin,orsimilarstructuretoreducetheriskofdamage.Morethan12inchesfrompipesandstructures,itiscommontouseavibratoryplatecompactorattachedtoabackhoe,orevenaself-propelledroller.Thecontractorshouldberesponsibleforselectingappropriatecompactionequipmentandadjustingtheliftthickne5sandmoisturecontentofthebackfillasneededforadequatecompactionandtoavoiddamagetothepipe.Ingeneral,heavymechanicalcompactionequipmentshouldnotbeallowedoverthepipeuntilthebackfillisatleast2feetabovethetopofthepipe.PavementSupportHaulroads,dependingontheirlocationaroundthesite,couldtraveloverrelativelyfirmgroundoracrosspocketsofsoftsoil.Wehaveflexiblerequirementsforthehaulroadbase.Itcanconsistofquarryspalls,orcrushedrock,orcrushedrockwithanNIBsurface.Thecontractorshouldhavesomecontroloverthisisadecision,sincethenatureoftheground,thetrafficloading,theweatherconditions,andothernon-designfactorswillaffectthesubgradeneeds.Forthepermanentroadways,werecommendthattheupper2feetoffillornaturalgroundbewell-compacted(toatleast95percentofthemodifiedProctormaximumdrydensity),firm,andnon-yielding.Thepavementsubgradecouldconsistof4inchesofasphaltover6inchesofcrushedrock,withheaviersectionsinthemajortruckaccessareas,andlightersectionsinlow-trafficareas.ThepavementsectionshouldbecomparedwiththeminimumCityorCountyrequirementsfortheroadways,andthemorestringentsectionshouldbeused.Weexpectthattheroadwayswillundergosomewidespreadsettlementovertimeinthehighfillareas,butabruptdifferencesinsettlementarenotexpected.StructuralFillSoilsplacedbeneathstructures,aroundutilities,orbelowpavedareasshouldbeconsideredstructuralfill.Inthesefillareas,werecommendthefollowing:•Structuralfillshouldonlybeplacedonadenseandnon-yieldingsubgrade.•Forimportedsoiltobeusedasstructuralfill,werecommendusingaclean,well-gradedsandorsandandgravelwithlessthan5percentbyweightpassingtheNo.200meshsieve(basedontheminus3/4-inchfraction)forgradinginwetconditions.Compactionofmaterialcontainingmorethanabout5percentfinematerialmaybedifficultifthematerialiswetorbecomeswet.Duringdrygradingconditions,thefinescontentmaybeincreasedprovidedthesoiliscompactednearitsoptimummoisturecontent.n5.R19014-04HAna?owsvsMay1,2015 10Contents•Placeandcompactallstructuralfillinliftswithaloosethicknessnogreaterthan10inches.Ifsmall,hand-operatedcompactionequipmentisusedtocompactstructuralfill,fillliftsshouldnotexceed6inchesinloosethickness.•Controlthemoisturecontentofthefilltowithin?percentoftheoptimummoisture.OptimummoistureisthemoisturecontentcorrespondingtothemaximummodifiedProctordrydensity.•Belowallstructures,thecompactionrequirementshouldbeatleast95percent.TheminimumpercentcompactionrecommendedhereinisapercentageofthemodifiedProctormaximumdrydensityasdeterminedbytheASTMD1SS?testprocedure.•Ifwetsubgradeareasareencounteredduringfoundationorpavementsectionpreparation,cleanmaterialwithagravelcontent(materialcoarserthanaUSNo.4sieve)ofatleast30to35percentmaybenecessary.•ThecompacteddensitiesofeachliftshouldbeverifiedbyaHartCrowserrepresentative.Beforefillcontrolcanbegin,thecompactioncharacteristicsmustbedeterminedfromrepresentativesamplesofthestructuralanddrainagefill.Samplesshouldbeobtainedassoonaspossible.Astudyofcompactioncharacteristicsshouldincludedeterminationofoptimumandnaturalmoisturecontents,maximumdrydensity,andgradationofthesesoils.UseofOn-SiteSoilasStructuralFillThesuitabilityofexcavatedsitesoilsforuseascompactedstructuralfilldependsonthegradationandmoisturecontentofthesoilwhenitisplaced.Astheamountoffines(thatportionpassingtheNo.200sieve)increases,thesoilbecomesincreasinglysensitivetosmallchangesinmoisturecontentandadequatecompactionbecomesmoredifficulttoachieve.Soilcontainingmorethanabout5percentfinescannotbeconsistentlycompactedtoadensenon-yieldingconditionwhenthewatercontentisgreaterthanabout2percentaboveorbelowoptimum.Reusablesoilmustalsobefreeoforganicandothercompressiblematerial.Topsoil.Werecommendthatthesurficiallayeroftopsoilnotbeusedasstructuralfill.Thismateriallikelycontainssignificantlymorethan5percentfines,and,therefore,willbemoisture-sensitiveduringperiodsofwetweather.Inaddition,thismaterialcontainsorganicmatterthatcouldleadtolong-termsettlementastheorganicmatterbreaksdownovertime.Surflcialtopsoilorothernativesoilmaybeusedinlandscapedareasifitcanbecompactedtoareasonabledegreewithconstructionequipment.FillandSurficialSoils.Becausethislayerconsistedofvaryingamountsofsiltnearthesurface,muchofthefillmaybesuitableforuseasstructuralfill.However,someofthesoilwithinthefilllayermayhaveafinescontentthatisgreatenoughtomakeitmoisture-sensitivewhenwet.Duringperiodsofwetweather,orifthematerialiswet,itwillbemoredifficulttouse.Earthworkoperationswouldneedtobescheduledduringperiodsofdryweathertokeepthematerial’smoisturecontentnearitsoptimumlevel..MW19014-04—May1,2015WIRTO?OWSER Contents11ExcavationGroundwaterControlOurexplorationprogramconsistedoflimitedtestpitexcavationstoobservetheshallowexcavationconditions.Wenotedthatwhilegroundwaterispresentintheexcavations,itshouldflowslowlyenoughtobecontrollableusingconventionalmean5.Teamexperienceatnearbysitesandhistoricalphotographsofworkatthesteamplantsupportthisopinion.Insomelocations,thiswillnotbethecase,butingeneral,shallowexcavationforconstructionofpilecapsorfootingsdonotrequireadetaileddewateringplanifthedepthofthecutislessthanabout7feetbelowexistinggrade.Reasonablydryconditionsshouldbeabletobemaintainedbypumpingfromoneortwosumpslocatedwithineachexcavation.Theexcavationsidewallsshouldbeprotectedfromsloughingbyusingsteelsheetsorsimilarprotection.Analternativemethodwouldbetoinstallanumberofseparatesumpsjustoutsidetheexcavationfootprintstolowerthegroundwatertableoverawiderareathanjustonepilecap.A12-inchslottedplasticcasingorculvertpipeplacedabout2feetbelowthebottomofexcavationandbackfilledontheoutsidewithpeagravelwouldserveasthe5ump.Deeperexcavationwillmostlikelyrequireanactivedewateringsystemusingdrilledwellsorwellpoints.Wewouldexpecttopumpsignificantquantitiesofgroundwaterbelowdepthsofabout10feet,andexcavationsofthisdepthshouldbeconductedwithgreatcaretoavoidsuddencollapsesofsidewallsandlossofsoilintegrityinthebase.Itisourunderstandingthatsuchasystemiscurrentlyunderconsiderationforremovalofthehistoricalpowerplantfoundationontheeastsideofthesite.Notethatattheadjacenthotelsiteaseriesofdewaterwellsandasheetpilecutoffwallwereusedtoconstructafoundationmat9feetdeep.RECOMMENDEDADDITIONALGEOTECHNCIALSERVICESHartCrowsercouldpotentiallycompleteadditionalservicessupportingthedesignandconstructionoftheproposedfacility.GroundwaterMonitoringandPumpingTestsSincetheconditionsalongtheroadwayaccessawayfromthesitetowardLakeWashingtonBoulevardarenotwellknown,therecouldbesomevalueintwoorthreeadditionalboringsandgroundwatermonitoringwellsthroughthatsegmenttoassessthegroundwatercontrolandconstructabilityissuesfortheutilities.Agroundwaterpumpingtestinthisareaisneededtoconfirmtheabilitytocontrolthegroundwaterandremovetheexistingpowerplantfoundationswithoutasheetpilesystemtoactascutoff.DrivenPileLoadTestsIn1999,fourdrivengroutpileswereloadte5tedbyDeWittConstructionandPrecisionMeasurements,Inc.WecontactedBruceLaneofPrecisionMea5urements,whosentustheloadtestreportincludingload/deflectioncurvesbutnotincludingtestlocations.Themaximumloadappliedwas300tons.Withagoodloadtestandtestreport,wecanjustifyreducingthefactorofsafetytoaslowas2.0.Then1.119014-04HreRTcROWSERMay1,2015 12IContentsoriginalloadtestsdidnotloadthepilestotheircapacity(loadingtocapacityresultsinanoverlyconservativedesign),andarenotapplicabletootherpilelengths.WehavecontactedAppliedFoundationTesting(AFT)toperformStatnamicloadtestingandobtainedthecompany’spricefortestingandreportingonthreeadditionalpiles(thatwouldneedtobeinstalled)uptoloadsofapproximately450tons.Ifhighercapacitypilesarecost-effective,AFTcantestthepilestoashighastwicetheloadforanadditionalcostofapproximately$40,000.WewillcoordinatewithCPLandExxelPacifictodeterminethemosteffectiveoptionfortheproject.AkeydifferencewiththeStatnamicapproachandstaticloadtestingisthatthereisnoneedtoinstallreactionpiles;also,multipletestscanbecompletedveryquicklycomparedwithtraditionalmethods.Thesedifferencesresultinlessexpensiveloadteststhanwhentraditionalmethodsareused,especiallywhenmorethanonetestisperformed.Inaddition,wewouldinstrumentthepilethroughoutitslength,whichwouldgiveustheloadversusdeflectioncurvenotjustatthetopofthepile,butalsoatotherpoints.Thistellsushowtheloadisshedtothesoilandhelpsuspredictnotjustcapacity,butalsosettlement,moreaccurately.Theresultsfrominstrumentedtestshelpavoidmisinterpretationofloadtests,andhelpinproperlydesigningpilestovariouslengths.Inaddition,theresultsallowustolocatethenewpilesfortestinginparticularlysensitiveareas.Withhighertestloadsandbroaderinstrumentation,thedesignshouldhavesignificantlyfewerpiles.ServicesduringConstructionDuringtheconstructionphaseoftheproject,werecommendthatHartCrowserobservethefollowingactivities:•Placementofstructuralanddrainagefillatthesite;•Observationoftheinstallationandtestingofpilefoundations;•Observationoftheinstallationofgroundimprovement;•Observationandverificationofthesuitabilityofallexcavatedsurfaces;•Excavationandplacementoffoundationsfloorslabs;•Othergeotechnicalactivitiesthatmayariseduringthecourseofconstruction.Thepurposeoftheseobservationsistoobservecompliancewiththedesignconcepts,specifications,orrecommendationsandtoallowdesignchangesorevaluationofappropriateconstructionmeasuresintheeventthatsubsurfaceconditionsdifferfromthoseanticipatedpriortothestartofconstruction.USEANDLIMITATIONSOFTHISREPORTWecompletedthisworkinaccordancewithourproposaldatedMarch2,2015.OurreportisfortheexclusiveuseofSecoDevelopmentanditsdesignconsultantsforspecificapplicationtothesubjectprojectandsite.Wecompletedthisstudyinaccordancewithgenerallyacceptedgeotechnicalpracticesforthenatureandconditionsoftheworkcompletedinthesameorsimilarlocalities,atthetimetheworkwasperformed.Wemakenootherwarranty,expressorimplied.L:\Notebooks9D14O45outhportofficeDevelopmentDesign\Deiiverables\Reports\Draft\southportCeotechnicalDesignReport.docxn19D14-04LXMay1,2015HtRTO?owsER SServiceLayerCred,ts:Sources:Esd.HERE.DeLorTne,USGS,Intennap,incrementPCorp.NRCAN,EsnJapan,MET!,EsriChina(HongKong),Esh(Thailand).TomTom.Mapnylndia,©OpenStreetMapwntributors.andthe015UserCommunityS4ISNIlISSINzre,lS;\3ItSINSIS4.4StN,a.ItlInt’4£Mt24.,IIN‘SeciNSINItN24:511S.11:.I1ikIPnyd.I.Nl2,dSNIlN25*,’425*11N21,,PtN2Se,Pikr,.IVStSnatItflesi--!tNesI‘Ca,‘204cd-Jo11aILNSINSISI2l*l5i1INt21*11NtSillSi44aI.NC2Sn4SCbyeI—N,‘I,£4IS4•425*Sia8NC2i,SWNC22:4ciN!22ndIiNC21.1214aII4a41-aCIjetililSISI4S5111*3,3115.4IluauProjectSiteUIt‘2*St‘I—•TI,.,,S,T7flPt:1111*51-aSS120InSi512111SItSi734uS•5123.401I3SMoth4S2ic.nhNINh%4NLa,NINStSSIS0FNS•411*511/2s24iSINCNI4141121*1144%‘InSIII1411:!4.nd.-aNIaSiS:5SS3NCISrS0.I•NWSIPSII;.5tI1321431‘4_I•NCN3:5StSSSSSI44NCS04501W1451501444’.1-‘-•stU44”40F,,d06*5*4“C4thIISt/Arnwns14*31447.4S-aSI’IaFa0SouthportOfficeDevelopment10002,000Renton,WashingtonNScaleinFeet4,000hVicinityMap ... .aaHCCPT-Ia•CPT-10HC-IrB-ISAA’4,4.CPTexploration(currentstudy),___;__HistoricalCPTexploration(byothers)Historicalboring(HartCrowser)Historicalboring(byothers)CrosssectionlocationanddesignationApproximateextentofsimilarsubsurfaceconditionsSoilsite1-C$—I.?,ç,k&Soilsite2I;Soilsite3fl,Transitionfromsoilsiteconditionsislikelygradual.I—betweenexplorations.LocationoftransitionisinferredbasedoninterpolationApproximate-iShuffletonfoundationsI’Sextentofri.1FtHCCPT-la•S,J4’-•1‘r‘11’spiiI151jr‘$311/HCCPT-2A1:!hL-1-A1t’HC-2‘Alzi]IN----- ---CPT3frApproximateextentof—‘CPT-5V5B4--S.CPT4’A’Splannedofficedevelopment’11HCCPT-5•i:—-£4d4L_-—.,111,tNA4-40%elI100•‘200‘:4d4;c4Ft-0r(%’‘*ti)’%SA.4’‘:\N‘%LW?‘%êScalea.SS.9inFeeta•HCqPV4-qEF?i“SouthportOfficeDevelopmentRenton,WashingtonSiteandExplorationPlan19014-045/15-VaKMFigure2 —U)--%(00zN-ZC,,0IciIflL0)F-FL0(2F-UFLAft0ft(2UI0IU00VeryloosetomediumdenseSAND15withlayersofSILTandCLAY77—7SofttostiffCLAYandSILTwithlayersofsiltysand_45adi—o960MediumdensetodenseSANDwithlayersofsiltySANDandsandySILTU,VC--275____770)97ESOftCLAY——?——?—?——7——?—?——?B—7907(—?—7__—105DensetoverydenseSAND120135150SouthportOfficeDevelopmentICPT-4ExplorationnumberRenton,Washington(245)(Offsetdistanceanddirection)HorizontalScaleinFeete—060120CrossSectionA-A’Cn0306019014-045/15Contactbetweensoilunitsisinterpolatedbetweenborings________________________________________________Note:IExplorationlocatioVerticalExaggerationx2VerticalScaleinFeetandrepresentsourinterpretationofsubsurfaceconditionsFigurebasedoncurrentlyavailabledata._________3 IiiLooseSANDandsiltySAND_____—7——?—————7——7——7——?——?SoftCLAY————B’B0•15300a006ODU,-aCz275-C)604:ago-a0a105120-135150Note:Contactbetweensoilunitsisinterpolatedbetweenboringsandrepresentsourinterpretationofsubsurfaceconditionsbasedoncurrentlyavailabledata.Loosetomediumdense/siltySANDandsandySILT11/__——?ft—/withCLAY-————layers79SoftCLAYandSILT——7———?——7——7—————7—7——7——7——7—SANDandsiltySAND7——7—————7———7____7______7——?————-.-_7———————•_.—7—-——--——?——--—7—-----—7——?——7--——tr———-7InterbeddedsofttostiffSILTanddensetoverydenseSANDC,t0CC)In0nCCPT-4Explorationnumber(245)(Offsetdistanceanddirection)ExplorationlocationHorizontalScaleinFeet06012003060VerticalScaleinFeetVerticalExaggerationx2SouthportOfficeDevelopmentRenton,WashingtonCrossSectionB-B’19014-045115iSWaaFigure4 aEa,5C0§HCCPT-1AVirScalsett4msnt.HCCPT-?V.flk.InttI.m.nt.I,1,’‘I,.Is’a5ThSaM?lwHCCPT-3•2V.flkaI..tthm.M/IC(SRT)CaWI-‘ULUvi,FanThof‘alety7-9’3FIII,ISeFIIeflpn(is)rHCCPT-4-SrflatK--nmol-I—II—U—0’IasWIIi,Ian-I--Iflflk.InnJ.mnt.—irmr—,—-rI,II13 5tttIennt(II)-jHCCPT-5I20U‘I’‘U.IL’13’—C.3-a503’.La707NI>7,//IV.rtflIi•ttIn.htiI3-la‘,‘2330’I,.4IlC43-a:3(3-3,,—barTh‘3.II.ii,’’0053’31.111Snlenpnt(b•s)/1HCCPT-6VertIcaleqflkm.Ms3-3I’Ill5(7-1,-’40’4?a:Ut’55’La.,.‘a7?iS’iiP115I(37Facto-ofsafety//‘II’TVFCI7I43SetIleent(01I/-,-rrraII45ISttiUentOf587kaend—Jr-‘4-ai4-IS.Jolt—II—‘ItoSI—4.33-10”01I:11—C30’40’a44.46’‘a52’34.30.60’LI‘I]’61412Il‘U1e533T)Irrrrrr0113I15SrancrofsafetynIInputpanniewnandanalysisdataLIIa14bIcreb.(0141Un:,’t.rnu:Icn¶IrthTtBA!12D1’)54,4Setflesrs(nfDe,t.toGWteruqj:IO,Q2ifnUo-vrtaJtsIIltTV.I:-—F.S.colorschenie•saIKatrdshI—veyiieaiysitltWs’!ySouthportOfficeDevelopmentRenton,Washhigton BJE 04/3012015 file CD0C V DO UI DCCOCD 00DV 3CDD CD C -C aCD0 Deflection in inches 20 30 a,a C 0 CDa C C aa,C 10 20 ... -0.05 0 O 0.05 0_i 0.15 0,2 0.25 0.3 0 Bending Moment in inch-kips -600 400 -200 0 200 400 10 Shear in kips -10 0 10 20 30 40 50 60 0 10 20 30 40 50 60 7070 Note5: I 0) 50 60 70 1.The pile head condilion was fixed and a lateral deflection was applied to the top of the pile,which resulted in abendingmomentofapproximately800inch-kips for the lowest displacement row.The top of the pile is located at adepthof0feet. 2.The generalized subsurface profile is based primarily on CPT-5. 3.A 70-foot-long augercast (concrete)pile was assumed based on the length needed to achieve axial capacity. 4.A 16-inch-diameter pile was modeled assuming a concrete strength of 5.500 psi.The steel rebar was assumed to have a yield stress of 60 ksi and an elastic modulus of 29000 ksi.A total of 8 US Std.#7 rebars was assumed. A compressive load of 270 kips was applied at the pile head. 5.A p-multiplier of 0.81 0.4,and 0.3 for rows 1,2,and 3,respectively,was used to reduce the lateral capacity ofpilesincloselyspacedgroups.This is based on a pile spacing of 3D. ‘IaC0 C CD r-U rm Co0 0 CD CDUIC a C C a, 3 CD -Rowl -n (0C CD ——Row 2 Row 3 and Higher .. eJE 04’3012015 ... Deflection in inches 0 0.05 Shear in kips -5-D.D5 0 10 2D 3D 40 50 SD 0 5 a).2 C -C aa)0 15 25 10 20 30 40 SD 60 Bending Moment in inch-kips 0.1 -800 -SOD -400 -200 0 200 400 0 10 20 30 a)a .2 40 o 0 50 60 70 Notes: 1.The pile head condition was fixed and a lateral deflection was applied to the top of the pile,which resulted in a bending moment of approximately SOD inch-kips for the lowest displacement row.The top of the pile is located at a depth of 0 feel. 2.The generalized subsurface profile is based primarily on CPT-1. 3.A 70-foot-long augercast (concrete)pile was assumed based on the length needed to achieve axial capacity. 4.A 1 S-inch-diameter pile was modeled assuming a concreLe strength of 5,500 psi.The steel rebar was assumed to have a yield stress of 60 ksi and an elastic modulus of 29,000 ksi.A total of S US Std.#7 rebars was assumed. A compressive load of 270 kips was applied at the pile head. 5.A p-multiplier of 08,0.4,and 0.3 for rows 1,2,and 3,respectively,was used to reduce the lateral capacity of piles in closely spaced groups.This is based on a pile spacing of 3D. 70 I -1 0w —0 fll,0 wa 2.&9- D a5t Ca”——a a, O a —0-I 70 CD0C 0 DO DCCo0 00Dt CDD ] CoC 0 -Rowl ——Row 2 Row 3 and Higher . .. SJE 04)3012015 xsx -Co Co 6 n*1 EL 0.0 a 0 0 a CD 30 a0 C ,4D 50 a.a, C C a0 Deflection in inches 0 10 20 -0.05 0 0.05 0.1 -800 -600 400 -200 0 200 400 Bending Moment in Inch-Rips . -5 Shear in kips 5 15 25 U 10 20 30 40 50 6060 70 0 10 20 30a.a, C C40 a0 50 60 70 Notes: 1.The pile head condition was fixed and a lateral deflection was applied to the top of the pile,which resulted in a bending moment of approximately 800 inch-kips for the lowest displacement row.The top of the pile is located at a depth of 0 feet. 2.The generalized subsurface profile is based primarily on CPTA. 3.A 70-foot-long augercast (concrete)pile was assumed based on the length needed to achieve axial capacity. 4.A 16-inch-diameter pile was modeled assuming a concrete strength of 5,500 psi.The steel rebar was assumed to have a yield stress of 60 ksi and an elastic modulus of 29,000 ksi.A total of 8 US Std.#7 rebars was assumed. A compressive load of 270 kips was applied at the pile head. 5.A p-multiplier of 0.8,0.4,and 0.3 for rows 1,2,and 3,respectively,was used to reduce the lateral capacity of piles in closely spaced groups.This is based on a pile spacing of 30. I I 70 r‘V rm CD0 CD CD C-, CDCo C Gt -a 9, n a 0 3 CD“aCD a) 0C 0 CO CD 00 ‘O3CD -Rowl 11 C CD ——Row 2 Row 3 and Higher . cc000Ua,aU,aa,UCccU,U,a,a,U,U,cca•• -• •16142.5-Foot-DeepPileCap—5-Foot-DeepPileCap10-Foot-DeepPileCap1210864200.00.10.20.30,40.50.6LateralDeformation(Inches)0.70.80.91.0In0U0SouthportOfficeDevelopmentRenton,WashingtonPileCapPassivePressureLoad-DeformationCurves04/15 MWZRIMRTO?OwSB?APPENDIXAFieldExplorationsMethodsandAnalysis19014-04.May1,2015 APPENDIXAFIELDEXPLORATIONSMETHODSANDANALYSISThisappendixdocumentstheprocessesHartCrowserusedtodeterminethenatureofthesoilsunderlyingtheprojectsiteaddressedbythisreport.Thediscussionincludesinformationonthefollowingsubjects:•ExplorationsandTheirLocation•ConePenetrationTestingExplorationsandTheirLocationHartCrowsersubsurfaceexplorationsforthisprojectincludesixconepenetrationtestspushedtoanon-surficialrefusaldepth,HCCPT-1throughHCCPT-6(2015).LocationofExplorations.Figure2showsthelocationofexplorations,locatedbyGPS.Thegroundsurfaceelevationsattheselocationsarebetween20and24feet,andwereinterpretedfromelevationsshownonbasemapprovidedbyBush,RoedandHitchings,datedSeptember6,2000.Themethoduseddeterminestheaccuracyofthelocationandelevationoftheexplorations.ConePenetrometerProbesWeusedaconepenetrometertoprobethesubgradesoilsforthisstudy.CompletedbyInsituEngineering,mc,theprobes,designatedHCCPT-lathroughHCCPT-6,wereadvancedtodepthsrangingfrom77.43to100.07feetbelowthegroundsurfaceonApril2,3,and15,2014.InsituattemptedonepushatHC-CPT1awhichhitandobstructionwithin5feetofthegroundsurface.Thepiezoconeisarrangedtomeasurethefollowingparameters,whichareusedforthesoilclassification:•Tipresistance,Qintsf(resistancetosoilpenetrationdevelopedattheconetip);•Frictionresistance,F5intsf(resistancetosoilpenetrationdevelopedalongthefrictionsleeve);and•Porewaterpressurebehindtheconetip,U2inpsi.Thesystemismountedonatruckwhichprovidesthenecessaryreactionfortheappliedloads.Theconeanditssleeveprovideinformationbywhichwecaninterpretthedensityandconsistencyofthesoils.Adirectcorrelationexistsbetweenthepointresistanceoftheconeandthebearingcapacityinthesoil.Anotherdirectcorrelationexistsbetweenthefrictionregisteredonthesleeveandthefrictioncharacteristicsofthesoil.Weusethepenetrometerresultsinconjunctionwiththesoilclassificationmethodsasappropriateforeachsite.SeeAttachment1fortherawCPTdata.FrictionValuesandSoilType.Generally,africtionratiolessthan2indicatessand;aratiobetween2and4indicatesasilt-sandmixture,clayeysand,orsilt;andratiosgreaterthan4indicateaclayeysiltorclay.nas19014-04May1,2015St. HartCrowser,IncnasHAIRTCROIVSERhttp://www.haftcrowser.comProject:SouthpoftOfficeDevelopmentLocation:Rentonn4-,aa)0ConeresistanceqtFrictionratioPorepressureu..SETIndex100200300400Tipresistance(tsf)Rf(°k)Pressure(psi)CPeT-flv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:49AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDesign\FieldData\ExplorationWgs\CPTAnalysisFile.cptIcSBTSBTlegend•1.Sensitivefinegrained2.Organicmaterial•3.Claytosiltyclay nasHartCrowserrIncI1t1RTCROWSERhttp:/fwww.hartcrowser.com47ojectSouthportOfficeDevelopment‘.ncation:RentanICalculationparametersPermeability:BasedonSBTRelativedesnistyconstant,Car:350.0SPTN5:Basedontandq,Phi:BasedonKuihawySiMayne(1990)Young’smodulus:BasedonvariablealphausingIc(Robertson,2009)•UserdefinedestimationdataPermeabilitySPTN601wYoung’smodulus5-1510-2015-25S20-30-5-10-15-20-25-30-35-40--Ca45-5°-55-60-70’75-80-25-35-30-IC35-0--C3-2a04C5-SITh_40--c4-250-55-60-65-7075-80-50--C3-2a0CS.10-15-20-25-30-35-40-45-50-55-60-65-70-75-so-55-Relative-cC0Dr(‘60-65-70-1x1091x1061x103Ksbt(ft,’s)80-01020304050N60(blows/It)II01,0002,000Es(tsf)CPeT-flv.1.7.642-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:49AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDesign\fleIdDa\ExplorabonLogs\CPTAn&ysisflIe.cpt atMaHartCrowser,IncIMRTcROIIISEI?http://www.hartcrowser.comProject:SouthpoftOfficeDevelopmentLocation:RentonOCRfactorforclays,[Itt:0.33•Userdefinedestimationdata.ConstrainedModulusShearmodulus5-10-5101520253035.Shearstrength15-—Supeak—5uremolded20--C4-,aa,CUndrainedstre10—15—20-25-Jo-47525-30-35-40--Caa,45.C50-55-6065-55.6010-15-20-25-30-35-40-45-50-55.60-65-70-75.80--C3-baa,C6570-C4-baa,Cc758070-75-35-40-45-50-55-60-65-70-75-80-80-010002,000010002,000M(CPT)(tsf)Go(tsf)CalculationparametersConstrainedmodulus:BasedonvariablealphausinghandQ,(Robertson,2009)Go:Basedonvariablealphausing1(Robertson,2009)Undrainedshearsfrengthconefactorforclays,N:Auto012345Su(tsr)600.51Su/a’,CPeT-ITv.1.76.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:50AMProjectfile:L:\Notebooks\1901404_SouthportOfficeoevelopmentDesign\FieldData\ExplorationLags\CPTAnalysisFiIe.cpt. flHaltCrowser,IncasIL4RTCROWSERhttp://www.hartcmwscr.comroject:SouthpoftOfficeDevelopment_.ocation:RentonShearWavevelocityStateparameterIn-situstressratioSoilSen10-10-rj45f5ci!!•::Vs(fVs)KoSCalculationparametersSoilSensitivityfactor,Ns:7.00•UserdefinedestimationdataCPeT-flv.1.7.6.42-CFflJdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:50AMProjectfile:L:\Notebooks\1901404_SouthportofficeDevelopmentDesigi\ReldData\ExplorationLogs\CPTAnalysisFiIe.cpt flHanCrowser,IncasIIARTCROWSEI?http://www.harftrowser.comProject:SouthportOfficeDevelopmentCPT:HCCPT-OlaLocation:RentonTotaldepth:83.83ftDissipationTestsResultsDissipationtestsDissipationtestsconsistsofstoppingthepiezoconepenetrationandobservingporepressuresCu)withelapsedtime(t).Thedataareautomaticrecordedbythefieldcomputerandshouldtakeplaceuntilaminimumof5Q%dissipation.Campanella(1989),yieldsavaluefort50,whichcorrespondstothetimefor5Q%consolidation.HwasthencalculatedbyHoulsbyandTehs(1988)theoryusingthefollowingequation:Txr2xl0.5c=—____tsOwhere:r:piezoconeradius1rstiffnessindex,equaltoshearmodulusGdividedbytheundrainedstrengthofclay(Sj.t50:timecorrespondingtoSO%consolidationPermeabilityestimatesbasedondissipationtestThedissipationofporepressuresduringaCPTudissipationtestiscontrolledbythecoefficientofconsolidationinthehorizontaldirection(Ch)whichisinfluencedbyacombinationofthesoilpermeability(kh)andcompressibility(M),asdefinedbythefollowing:kh=chxvW/Mwhere:Misthe1-Dconstrainedmodulusandvistheunitweightofwater,incompatibleunits.TabularresultsCPTUDepthasstsotsaGIScbci,MkhBorehole(It)Cso)Cs)(years)U(ft2/s)(ifa/vear)(tsf)(ft/s)HCCPT-Ola16.08124.4154774.91E-004327.339.59E-o08325.051.20E-010HccpT-ola22.97110.3121633,86E-004718.911.B1E-00763.711.52E-009HCCPT-01a35.760.000.OOE+000100.000.00E+0000405.57-1.OOE+004HCCPT-Ola42.490.000.00E+000318179.28O.OOE+0000352.85-1.00E+004HccPT-Ola55.450.000.00E+000100.000.00E+0000982.10-1,00E+004HCCPT-Ola71.520.00O.OOE+000100.00O.OOE+00001112.86-1.OOE÷004HCCPT-Ola83.990.000.00E+000100,000.00E+00002842.780,00E+000. ThissoftwareIslicensedto:HartCrowsercrname:HCCPT-OlaPiezoconeDissipationTest:HCCPT-OlaDepth:16.08(ft)Porepressure15145•1413.513LflaSC)SC)aC)CC.uinitial9.858•7.5.7.naC)Ctm(s)110100uO=3.90(ps14000050100—___ __ _Pressure(psi)Legend—u2penebation•Initialdissipation‘Endofdissipation(extrapolated)•Initialestimatedatt=0-- - Thissoftwareislicensedto:HartCrowserCPTname:HCCPT-OlaInaNa,InIna,aa,C0-PiezoconeDissipationTest:HCCPT-OtaDepth:22.97(ft)Porepressure•Initialdissipation‘Endofdissipation(exfrap&ated)•Initialestimatedatt=0-Caa,0tirmCs)110ia&=6.89(psi)Pressure(psi)Legend—u2peretmtion Thissoftwareislicensedto:HartCrowserCPTname:HCCPT-OlaPiezoconeDissipationTest:HCCPT-OlaDepth:35.76(ft)Pressure(psi)Legend—u2penetration•Initialdissipation11.811.6-11.4-11.2-Porepressure10.8-10.410.6-n.jciLIciaciCa10.2-0123456789101112V0.50(SAO.50)50100VEndofdissipation(extrapolated)Initialestimatedatt=0 Thissoftwareislicensedto:HartCrowserU,a0aa)00.r4-,a0CCPTname:HCCPT-OlaPorepressure14.5-14-13.5-13-12.5-12-11.5-11—10.5-10-9.5.9.8.57.5.7.6.56-S4.5-4-3.5-3.2.5-PiezoconeDissipationTest:HCCPT-OlaDepth:42.49(ft)=14.86(psi)IIIIIIIIIo123456789101112t”0.50(sAO.50)osoiooPressure(psi)Legend—u2penetration•InitialdissipationVEndofdissipation(extrapolated)•Initialestimatedatt=0. Thissoftwareislicensedto:HartCrowserCPTname:HCCPT-OlaPiezoconeDissipationTest:HCCPT-OlaDepth:55.45(ft)Porepressure•2O.420.2-20-19.8-19.6-19.4-19.2-19-Lfla18.818.4.a)b.182a)&18-17.8-17.6-17,4-17.2-1716.816.616.40123456789V0.50(sA0.50)50100Pressure(psi)Legend—u2penetratcon•Initialdissipation•Endofdissipation(extrapolated)•Initialestimatedat1=0 Thissoftwareislicensedto:HartCrowser30•2826242220-1816n.j0LflU,a)aa)C0-CPTname:HCCPT-OlaLegend—u2penetration.Porepressure.PiezoconeDissipationTest:HCCPT-OlaDepth:71.52(ft)uO=30.14(psi)IIIIIIIIIIII01234567891011121314V0.50(s’0.50)1412-10-8-6-4-2-0--2--4--Caa)C15Pressure(psi)•InitialdissipationVEndofdissipation(extrapolated)•Initialestimatedatt=0 ThissoftwareIslicensedto:HartCrowserCPTname:HCCPT-Dla32-3D-28-26-24-22-20-aisr.JDa,U,Laa,aa,0aPiezoconeDissipationTest:HCCPT-OlaDepth:83.99(ft)Porepressure34-U=35.55Cisi)16-14-12-10-8-6-4.2-0--2--4--6-raa’I’’’o1234567891011121314151617V0.50(s”0.50)Pressure(psi)1’S119050100rL_-—uZpenetration•InitialdissipationVEndofdissipation(extrapolated)•Initialestimatedatt=O HartCrowser,IncnamHARTcROWSERaa,CProject:SouthportOfficeDevelopmentLocation:kentonConeresistanceqtFrictionratioPorepressureuSBTIndex20040060002468tOTipresistance(tsf)Rf(%)0204060Pressure(psi)CPeT-ffv.1.7.6.42-CPTUdatapresentaUon&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:50AMProjectfile:L:\NoWbooksU9Ot4O4.SouthportOfficeDevelopmentDesign\ReIdData\ExplorauonLogs\CPTAnalysisFiIe.cptIcSBTSBTlegend•1.Sensifr.efinegrained•4.Clayey•2.Organicmaterial[]5.Siltys•3.claytosiltyclayJ6.clean. flHartCrowser,IncMsHORTCROWSERhttp://wvnv.hartcrowser.comProject:SouthpoitOfficeDevelopmentStation:PermeabilitySPTN60RelativedensityCa0C‘<-C‘ICta5.1015’20’25’3035.40’45£50-a55-60-65-70-75-80-85-90-95-0Caci05.10152025’30’35.4045’SD-55.6065-70’75.8085-90-95-too-Young’smodulus5.1015’202530’35.4°’Caci055’60’65’70’75.85’90-950t1x101x104lxlo3102030405001,0002,000Ksbt(1t,’s)N60(blows/Vt)Es(tsf)CalculationparametersPermeability:BasedonSBT,Relativedesnistyconstant,Ctq:350.0SPTNec:BasedonIandq,Phi:BasedonKulhawy&Mayne(190)Young’smodulus:Basedonvariablealphausingk(Robertson,200)•UserdefinedestimationdataCPeT-flv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:50AMProjectfile:L:\Notebooks\19o1404_SouthpoftOfficeoevelopmentDesign\Fieldoata\Explorationtogs\cflAnalysisflle.cpt20406080Dr(0/0) nasHartCmwser,IncHARTCROWSERhtW://vA’w.hartcrowser.comProject:SouthportOfficeDevelopmentLocation:RentonCPeT-ffv.1.76.42-CRrUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:50AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDeslgn\fleldDab\ExplorationLogs\CPTAnalysisFllo.cpt.ConstrainedModulusShearmodulusShearstrengthUndrainedstrengthra22fl34C.45a556065705.10IS.2025-30-35-40-C45553.acio5560-65-70-75-so.85-90-95.100•t10-15-20-25-303545-05055.60-65-70-75.—Supeak—SuremoldedaL10-15-20-25-30-35.-40.-Caci45-050-55.60-65-70-75.8590950CalculationparametersConstrainedmodulus:BasedonvariablealphausingIandQrn(Robertaon,200w)Go:Basedonvariablealphausingk(Robertson,200g)Undrainedshearstrengthcomefactorforclays,Nm,:Auth2,00062,0000123400.5M(CPT)(tsf)Go(tsf)Su(tsf)Su/a’,vOCRfactorforclays,Nkl:0.33•Userdefinedestimationdata flHartCrowser,IncasIIARTcROWSERhttp://www.hartsrowser.comrojed:SouthpoftOfficeDevelopmentcation:kentonShearWavevelocityStateparameterTn-situstressratioSoilsensitivity5.rc70)70-4,6060-75.75.8080-65-65-a85-85-70-70-90-90-75.75.100 -____ ____ _ ____ _ ____ _ ____ _ ____ ____ ____ _ ____ _ ____ _ ____ _ ____ _ ___.___ ___ _ ___ _ ___ _ ___ _ ___ _ ___ _ ___—•I•I•II•II•I•I•I•05001,000-04-0.2001201234Vs(His)qiKoSCalculationparametersSoilSensitivityfactor,N5:7.00•UserdefinedesthnationdataCPeT-flv.1.7.5.42-CPThdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:50AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDesign\RddData\Exp!ocationLogs\CPTAnalysisFilo.cpt HaftCrowser,Incn‘aIIARTCROWSERhttp://www.haftcrowser.comProjectSouthpoftOfficeDevelopmentLocation:RentonDissipationTestsResultsDissipationtestsCPT:HCCPT-02Totaldepth:100.07ftDissipationtestsconsistsofstoppingthepiezoconepenetrationandobservingporepressures(u)withelapsedtime(t).Thedataareautomaticrecordedbythefieldcomputerandshouldtakeplaceuntilaminimumof50%dissipation.Campanella(1089),yieldsavaluefort50,whichcorrespondstothetimefor50%consolidation.Teh’s(1988)theoryusingthefollowingequation:where:wasthencalculatedbyHoulsbyandr:piezoconeradiusrstiffnessindex,equaltoshearmodulusCdividedbytheundrainedstrengthofclay(Se).t:timecorrespondingtoSQ%consolidationPermeabilityestimatesbasedondissipationtestThedissipationofporepressuresduringaCPTudissipationtestiscontrolledbythecoefficientofconsolidationinthehorizontaldirection(q,)whichisinfluencedbyacombinationofthesoilpermeability(Rh)andcompressibility(M),asdefinedbythefollowing:kh_h<VW/Mwhere:Misthe1-Dconstrainedmodulusandyb.,istheunitweightofwater,incompatibleunits.CPThDeptht50G/S.ci,c14Borehole(ft)Cso)(s)(years)(ft?/s)(ft1flear)(tsfl(ftIs)HccPT-o236.090.0U0,00E+000100.00O.OOE+0000593.97-1.OOE+004HccPT-o245.770.00O.OOE+000100.00O,00E+000U1131.84-1.UUE+004cPeT-rrv.1.7.6.42-cvrudatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1901404..SouthportOfficeDevelopmentDesign\FieldData\ExplorabonLogs\cPTAnalysisFile.cpt.Txr2x0.5ch=tsoTabularresults17--.j.. Thissoftwareislicensedto:HartCrowserCPTname:HCCPT-02an.jzzU,U,a,aa,00.CPeT-ITv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1g014o4_SouthportOfficeDevelopmentDesign\Fieldoata\ExplorationLogs\CPTAnalysisFile.cpt18p.13.5-•13.12.51211.511-10.51095.9.PorepressurePiezoconeDissipationTest:HCCPT-02Depth:36.09(ft)=13.59(psi)IIIIIIIII12345678910111213tAO.5O(sAO.50)8.5-87.5.7.6.565.5.5.4.5-4.3.53.2.5-21.5--Caa,C0Pressure(psi)Legend—u2penetration•InitialdissipationVEndofdissipation(exflpolated)•Initialestimatedatt=OA Thissoftwareislicensedto:RaftCrowserCPTname:HCCPT-02InaNDa,totoa)aa)0aPiezoconeDissipationTest:HCCPT-02Depth:45.77(ft)Porepressureis.-CaSia0123456789V0.5O(sAQ5Q)Pressure(psi)Legend—u2penetration•InitialdissipationVEndofdissipation(extapolated)•Initialestimatedatt=OCPeT-ffv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1901404_SouthpoftOfficeDevelopmentDesign\FieldData\ExplorationLogs\CflAnalysisFile.cpt flHartCrowser,IncasHARTCROWSERhttp://www.hartcrowser.comProject:SouthportOfficeDevelopment(‘)ication:RentonConeresistanceqtFrictionratioSBTIndex5101520Porepressureu25303540—45raci05055606570758085901002003004000246810Tipresistance(tsr)Rf(°/o)02040608010023Pressure(psi)IcSBTSBTlegend•1.Sensirivefinegralned•4.CIa$2.organIcmaterialQ5.Silt•3.Claytosiltyclayj6.dc.CPeT-ffv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1901404_Southpo,tOfficeDevelopmentDesign\FieldDab\ExplorauonLogs\CPTAnalysisFile,cpt flHartCrowser,IncSRHAIRTO?OWSERhttp://vw.hartcrowser.comProject:Location:SouthportOfficeDevelopmentRentonPermeability510SPTN60152025}Young’smodulus5.10Relativedensity3035405-N-r‘—45raa’SOC5631520253°.35.4045.C0.050C55.60-‘I.610-15-20-25-30-35-40-t‘—45-Ca50-055-60-65-70-BB65-7°-75-80-85-75-1x1091x1061x10301020304050Ksbt(fIJs)N60(blows/It)go.BCB5-90-CalculationparametersPermeability:BasedonSBTrRelativedntyconstant,C0.3500SPTN50:BasedonIandqPhi:BasedonKulhawy&Mayne(1990)Young’smodulus:BasedonvariablealphausingI,(Robertson,2009)•Userdefinedestimationdata5001,0001,5002,000Es(tsf)CPeT-flv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDeslgn\FieldDab\ExplorabonWgs\CPTAnalysisFile.cpt0204060BCDr(%). flHartCrowser,IncMsIL2RTCROWSERhttp://www.hartcrowser.comConstrainedModulusShearmodulus-ShearstrengthUndrainedstrengthiProject:SouthportOfficeDevelopment(“)cation:kenton5.10•1520253035.4045.n0-a,50-U55.6065•5.10-15-20-25-30-35.4°-4-45.raci50-a55.60-65-7075.80-85-28-30-32-34.36-38-40-42-44.46-48-50-52-54.S6-58-aw60-62-64-66-68-70-72-74-76-78-80-82-84-86-88-70-75.80-t—surn&dedin56-£aci60-62-64-66-68-70-72-74.76-78-80-t-r=;4,85-90-90I•I•01,0002,000M(CPT)(tsf)I•I•I01,0002,000CalculationparametersConstrainedmodulus:BasedonvariablealphausingIandQtn(Robertson,2009)Go:BasedonvariablealphausingI(Robertson,2009)Undrainedshearstrengthconefactorforclays,Ne:AutoGo(tsf)Su(tsflSu/a’,vOCRfactorforclays,Nkl:0J3•UserdefinedestimationdataCPeT-ffv.1.7.6.42CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51ANProjectrile:L:\Notebooks\1901404SouthportOfficeDevelopmentDeslgn\FieldData\ExploraUonLogs\cPTAnalysi5FiIe.cpt n-SHartCrowser,IncHARTcROWSERProject:SouthportornDevelopmentLocation:Renton0500Vs(fVs)CalculationparametersSoilSensitivityfactor,N5:7.00———Userdefinedestimationdata28-3°-32-34-36-38-40-42-44.46-48-50-52-54.aci60-62-64-66-68-70-7274.76788082-8486-88-28-30-32-34-36-3540-42-44.46-48-so.52-54.56-£58-aci60-62-6466-68-70-72-74-76-78-80-82-84-5688-SoilsensitivityCPeT-ffv.1.7.6.42-CPTIJdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDeslgn\Fie!dDato\ExploradonLogs\CPTAnalysi5File.cpt.I5-10-15-20-25-30-35-40-‘—‘45--Caci50-a55.60-65-70-75-50-85-go.5-10-15-20-25-30-35-40-45-50-55-60-65-70-75.80-raciaShearWavevelocityStateparameterIn-situstressratioL85-901,000I•I•I‘I•-0.3-0.2-0.10‘p•—I00.510123KoS HartCmwser,IncnaHARTCROWSERhttp://wwwhartcrowser.comCojed:SouthportOfficeDevelopmentcation:RentonDissipationTestsResultsDissipationtestsCPT:HCCPT-03ThtaIdepth:g4.ooftDissipationtestsconsistsofstoppingthepiezoconepenetrationandobservingporepressuresCu)withelapsedtime(t).Thedataareautomaticrecordedbythefieldcomputerandshouldtakeplaceuntilaminimumof50%dissipation.Campanella(1989),yieldsavaluefort,whichcorrespondstothetimefor50%consolidation.Teh’s(1988)theoryusingthefollowingequationhwasthencalculatedbyHoulsbyandwhere:Ch=TxrzxJrO5t5Dr:piezoconeradiusrstiffnessindex,equaltoshearmodulusGdividedbytheundrainedt:timecorrespondingto50%consolidationPermeabilityestimatesbasedondissipationteststrengthofdayThedissipationofporepressuresduringaCPTudissipationtestiscontrolledbythecoefficientofconsolidationinthe‘trizontaldirection(qjwhichisinfluencedbyacombinationofthesoilpermeability(kh)andcompressibility(M),as—<ieflnedbythefollowing:kh=chxVW/Mwhere:Misthe1-Dconstrainedmodulusandy1,istheunitweightofwater,incompatibleunits.TabularresultsCPTUDeptht,ot,o0,ci,IIkj,Borehole(ft)(s)(years)U(ft2/s)(ft’fyer)(tsf)(his)HccPT-0320.010.000,00E+000100.00O.00E+0000485.20-1.OOE+004HCCPT-0332.81468.12191566.95E-003176.454.g7E-oog086.191.SOE-012CPeT-ITv.1.7.6.42-cudatapresentation&interpretationsoftware.Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\Notebooks\1901404_SouthpoftOfficeDevelopmentDesign\FieldData\ExplorauonLogs\cPTAnalysisFile.cpt24H Thissoftwareislicensedto:HartCrowserCPTname:HCCPT-0367V0.50(5AO.50)5-0-15-20-25-30-35-4°-45-Caa,U5°-55-60-65-7°-75-80-85-9°-Legend—uZpenetrationVInitladissipationEndordissipation(exUpolated)Inibalestimatedatt=0CPeT-ITv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectrile:L:\Notebooks\1901404_SouthpoftOfficeDevelopmentDesign\FieidData\ExplorationLogs\cPTAnalysisFiiecpt25.H:;riPorepressure728-7.27-7.26-7.25-7.24-7.23-7.22-7,21-7.2-7.19-7.18-7.17-7.16-7.15-7.14-7.13-7.12-7.11-7.1-7.09-7.08-7.07-7.06-7.05-7.04-PiezoconeDissipationTest:HCCPT-03Depth:20.01(ft)uO=7.29(psi)IIIIIIIII01234591011121314..\II•050100Pressure(psi) ThissoftwareIslicensedto:HartcrowserCPTname:HCCFr03PiezoconeDissipationTest:HCCPT-03Depth:32.81(ft)PorepressureCPeT-ffv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L:\FLotabooks\19014o4SouthportOfficeDevelopmentDesign\FieldData\ExplorationLogs\CPTAnalysisFile.cpt— ._ .—26an.jinC’,aaa0a-aa0110tin(s)1001,000III050100Pressure(psi)Legend—u2penetetlon•Initialdissipation•Endofdissipation(ettrapolawd)•Initialestimatedatt0 HartCrowser,IncnaHARTO?OWSERhttp://vwvm.hart.aowser.comProject:SouthportOfficeDevelopmentLocation:Renton1015203035.£a00555.60’65’70’75,80’ConeresistanceqtFrictionratioPorepressureuCPeT-flv.1.7.5.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:52AMProjectfile:L:\Notebooks\1901404,.,SouthpoftOfficeDevelopmentDeslgn\FieldData\ExplorationLogs\CPTAnalysisFile.cpt.5.25SBTIndex0’tCaciC85Tipresistance(1sf)01020304050Rf(°/o)Pressure(psi)23IcSBTSBTlegend•1.S&isitverinegrained•4.2,OrganIcmaterialQ5.SiltyLa•3.Claytosiltyclays.clean HartCrowser,IncnMsHI1RTCROWSERhttp://www.haftcrowser.comProject:SouthportOfficeDevelopment)cation:RentonSPTN6OYoung’smodulusII102030405005001,000N60(blows/It)Es(tsf)CalculationparametersPermeability:BasedanSBT,Relativedesnistyconstant,CDr:350.0SPTNoo:BasedonIandqoPhi:BasedonKulhawy&Mayne(1990)Young’smodulus:BasedonvariablealphausingL(Robertson,2009)•UserdefinedestimationdataPermeability1015202530Relativedensity35540raa,O50455-10-15-20-25-30-35-45-aa,0so-55.60-65-70-75.80-85-55am4>60655.10-15-20-25-30-35.545-aa,Oso-55.60-65-70-75-80-85-705-10-15-20-25-30-35£aV055.60-65-70-75.80-85-80851x109zxzo6ixio’Ksbt(IWs)00CPeT-flv.1.7.6.42’CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:52AMProjectfile:L:\Notebooks\1901404SouthportOfficeDevelopmentDesign\FieldData\ExplorationLogs\cPTAnalysIsFiIe.cptI—I—I—I20406080Dr(%) n-SHartCrowser,IncHIRTCROwSER10•15-20-25-30-35.p40.45.a0o5055.60657075.8065’http://www.haftcrowser.comProject:SouthpoftofficeDevelopmentLocation:Renton5ConstrainedModulusShearmodulusShearstrengthn—Supeak—SummoldedUndrainedstrenqthral55.101520253035.n45-aa,050-55-60-5.10’15•202530354045.5.10-15-20-25-30-35-fl45.aCoso.55.60657°-75-60-55.5CaC050•C55.65-70-75p86-85-1’1•11’050010001,50005001,0001500M(CPT)(tsf)Go(tsf)CalculationparametersConstrainedmodulus:BasedonvariablealphausingkandQ(Robertson,2009)Go:Basedonvariablealphausingl(Robertson,2009)Undrainedshearstrengthconefactorforclays,N:148055I’I.012345Su(tsr)OCRfactorfordays,N:0.33•UserdefinedesbmabondataCPeT-flv.1.7.6.42-cvrudatapresentabon&interpretabonsoftware-Reportcreatedon:4/30/2015,11:58:53AMPrnjedfile:L:\Nobocks\190l404_SouthpottOfficeDevelopmentDesign\Fi&dData\ExplorabonLogs\CPTAnalysisFile.cpt00.511.5SuJa,v HartCrowser,IncaIIARTCROWSERhttp://www.hartcrowser.comProject:SouthpoftOfficeDevelopment•otion:RentonShearWavevelocityStateparameterIn-situstressratioSoilsensitivity--5.5.5.10-4O-Z’40-40.,..40545.545-45-050.so-5O.cC___ _1Vs(fVs)KoSCalculationparametersSoilSensitivityfactor,N5:7.00•UserdefinedestimationdataCPeT-flv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:53AMProjectfile:L:\Notebooks\1901404_SouthportOfficeDevelopmentDesign\FieldData\ExplorabonLogs\CPTAnalysisFile.cpt nMsHartCrowser,IncHARTO?OWSERhttp://ww.hartcrows&.comProject:SouthpoftornDevelopmentLotion:RentonadiaFrictionratioPorepressureuSBTlegend1.Sensitivetinegrained2.Organicmaterial3.ClaytosiltyclayConeresistanceqt115•2025SBTIndex3035.2004006000246B10Tipresistance(tsr)Rf(°/o)0102030Pressure(psi)12IcSBT••4.•ci5.SiltysIQ6.cleanCPeT-ffv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:53AMProjecttile:L:\Notebooks\1901404_southportOfficeDevelopmentDesign\FleldData\ExplorabonLogs\CPTAnalysisFllecpt na.HartCrowser,IncHtRTCROWSERhttp://www.hartcrowser.comProject:SouthportOfficeDevelopmentation:kenton1520253035.40C-45.a,U5055.606570SPTN6O5-10-15-20-25-30354Q.C45.0JU50-55-60-65-70-75.80-85-Permeability5..2S.C-,Relativedensity5.10-15-20-25-30-3540-C45-a,CSO-55.60-65-70-75.IYoung’smodulusi15.10-15-20-25-30-35.40-C45.a,U50-55.60-65-70-75.80-85-80-85-ThCix1o’-1xi0ixio’Ksbt(Ws)CalculationparametersPermeability:BasedonSBTRelativedesnistyconstant,Co,:350.0SPTN60:BasedonIandq0Phi:BasedonKuihawy&Mayne(10)Young’smodulus:BasedonvariablealphausingI(Robertson,200w)•Userdefinedestimationdata0102030405005001,0001,500020406080N60(blows/It)Es(tsf)Dr(°/o)CPeT-rrv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:53AMProjectfile:L:\Notebooks\19D1404_SouthpoftOfficeDevelopmentDesign\FieldData\ExplombonLogs\CPTAnalysisFile.cpt flHaltCrowser,IncatHARTCROWSERhttp://www.haftcrowser.comProject:SouthportOfficeDevelopmentLocation:RentonConstrainedModulusShearmodulusShearstrengthUndrainedstrengthratCc_9’409’4040-t’40-_______________7070-65-65-.1,0’002,c,006i’4aM(CPT)(tsf)Go(tsf)Su(tsf)Su/a’,vCalculationparametersConstrainedmodulus:Basedonvariablea/p/iausingkand%,(Robaton,2009)OCRfactorfordays,N.,:0.33Go:Basedonvariablealphausingk(Robertson,2009)tUserdeflnedestimationdataUndrainedshearstrengthconefactorforclays,N:14CPeT-flv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:53AMProjectfile:L:\Notebooks\1901404SouthpoitOfficeDevelopmentDesign\FieldData\ExploraUonWg5\CPTAnalysi5File.cpt. flHartCrowser,IncatLe.RTCROWSERhttp://www.haacrowser.comProject:SouthportOfficeDevelopmentf’).cation:RentonShearWavevelocityStateparameterIn-situstressratioSoilsensitivityE4024040-___ __ ___CNc.CiCi@145ooa5050-5055.55-6060-6565-605001M00Vs(ftjs)KoCalculationparametersSoilSensthvityfactor,N5:7.00—•——UserdefinedestimationdataC‘I1015•202530CCC-CaCiaC30455055.60657075CC-C2012CPeT-flv.1.7.6.42-CPThdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:53AMPmjedfile:L:\Notebooks\t901404_SouthportOfficeDevelopmentDesign\FieldData\ExplorabonLogs\CRrAnalysisFile.cptS n£1HartCmwser,IncHAnTcIIOMSERhttp://www.hartcrowser.comProject:SouthportOfficeDevelopmentLocation:kentonCPeT-rrv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:51AMProjectfile:L\Notebodcs\1g01404_SouthportOf&eDevelopmentOesi9n\FieldData\Explorationlsgs\CPTAnalysisFiletptConeresistanceqtFrictionratioPorepressureuSBTIndex-Caa,020040002468Tipresistance(1sf)Rf(°/o)010203040506070123Pressure(psi)IcSBTSBTlegend•1.Sensitivefinegrained•4.Clayey•2.Organicmaterial5.Siltys•.claytosiltyclay[]6.Clean!. nasHIIRTCROWSERHartCrowser,Inchttp://www.hartcrowscr.comSPTN6O-I—-I010203040N60(blows/It)5.10-15-20-25-30-35-na,045-50-55-60-65-70-75.500500I•II•020406080Dr(°/o)CalculationparametersPermeability:BasedonSBTrRelativedesnistyconstant,L-r:350.0SPTN61:Basedon1andqPhi:BasedanKulhawy&Mayne(iggO)Young’smodulus:BasedonvariablealphausingIC(Robert500,200)•Userdefinedesfimabondataroject:cation:SouthpoftOfficeDevelopmentRentonPermeabilityYoung’smodulusN.Relativedensity-Caa03lxio’lxio’lxio’Ksbt(fWs)tz.t5.10-is.20-25-30--Ca40-a045.50-55.60-65-70-75-5.lois.20-25-30-35.-Ca40-a,045.50-55.60-65-70-75.7amIT1,000i,500Es(tsf)CPeT-ffv.i.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,li:58:52AMProjectfile:L:\Notebooks\190i404..SouthportOfficeDevelopmentDesign\FieldData\ExplorabonLogs\CPTAnalysisFiIe.cpt SHanCrowser,Inca.HARTCROWSERht://www.hartcrowser.comProject:SouthpoftOfficeDevelopmentLocation:RentonConstr&nedModulusShearmodulusShearstrengthUndrainedstrengthraSSupeakI—Suremolded3636-__1010-38-3840-40-15-15-.,—_—42-42-20-20-44-44-25-25-46-4630-30-45-48SD.50g35-S24f3.54-S40056-56-45-45-50-60-60-55-55.62-62-60-64-64-60-66-66-65-65-68-68-7070-7°-7°.C75EEE_E’-72-72-IIIIIIII•II01,0002,00001,0002,000012330.511.5M(CPT)(tsf)Go(tsf)Su(tsf)Su/o,vCalculationparametersConstrainedmodulus:Basedonvariablealphausinghand%,(Robertson,2009)OCRfactorforclays,NkI:033Go;Basedonvariablealphausingk(Robertson,2009)•UserdefinedestimationdabUndrainedshearstrengthconefactorforclays,Nk:AutoCPeT-flv.1.7.6.42-CPTUdabpresentation&interpretationsoftware-Reportcreatedon:4/30f2015,11:58:52AMProjectfile:L:\Notebooks\1901404_SouthpoftOfficeDevelopmentDesign\Fieldoata\ExplorabonLogs\CflAnalysisFile.cpt. flHartCrowser,IncasIIARTCROWSERhttp://w.hartcrowser.comProjectSouthportOfficeDevelopment()cation:RentonStateparameterSoilsensitivity5.1015-20-25-30-Ca40-a)C45-50-55.60-70-75-ShearWavevelocityrS5—10-15-20-25-30-Ca4D-a)C45-50-55-60-65-70-75-34.36-3540-42-4446-45.50-52-C54.C56-58-60-6264-65-68-70-72-In-situstressratioC34-36-38-40-42—44-46—45-50-52-C54-C56-58-SD.62-64-66-68-70-72-aCCcczVs(fvs)CalculationparametersSoilSensitivityfader,Ns:7.00•Userdefinedestimationdata‘pI•I•I•I•III1•105001,000-0.2-0.1000.5101234KoCPeT-ITv.17.5.42CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:52AMProjectfile:L:\Notebooks\1901404.SouthpoftOfficeDevelopmentDesign\FieldData\ExplorationLogs\CPTAnaIy5isFiIe.cptS flHartCrowser,IncastIP.RTCROWSERhttp://www.haftcrowser.comProject:SouthpoftOfficeDevelopmentCPT:HCCPPOGLocation:RentonTotaldepth:77.43ftDissipationTestsResultsDissipationtestsDissipationtestsconsistsofstoppingthepiezoconepenetrationandobservingporepressures(u)withelapsedtime(t).Thedataareautomaticrecordedbythefieldcomputerandshouldtakeplaceuntilaminimumof50%dissipation.Campanella(1989),yieldsavalueforL,whichcorrespondstothetimefor50°kconsolidation.wasthencalculatedbyHoulsbyandTehs(1988)theoryusingthefollowingequation:Txr2x10.5ch=tsowhere:r:piezoconeradiusIr:stiffnessindex,equaltoshearmodulusCdividedbytheundrainedstrengthofclay(Se).tso:timecorrespondingto5O%consolidationPermeabilityestimatesbasedondissipationte5tThedissipationofporepressuresduringaCPTudissipationtestiscontrolledbythecoefficientofconsolidationinthehorizontaldirection(Ch)whichisinfluencedbyacombinationofthesoilpermeability(kh)andcompressibility(M),asdefinedbythefollowing:khch>(VW/Mwhere:Misthe1-0constrainedmodulusandvistheunitweightofwater,incompatibleunits.TabularresultsCPTUDepthtsotso615ci1Borehole(if)su)(s)(years)(ft’/s)(ft’iyear)(tsr)(ftls)HCCPT-O621.980.000.OOE+000100.00O.OOE+0000439.59-t.OOE÷004cPeT-rrv.1.7.6.42-cpmdataprentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:52AM31ProjectPile:U’Noteoks\19014O4SouthportOfftDevelopmentDesn\FieldData\ExploratlenLogs\cPTAnaIpsFiIe.cpt ThissoftwreIslicensedto:HartCrowserCPTname:HCCPT-OE.PiezoconeDf5sipationTest:HCCPT-06Depth:21.98(ft)PorepressureCPeT-rv.1.7.6.42-CPTUdatapresentation&interpretationsoftware-Reportcreatedon:4/30/2015,11:58:52AMProjectrile:L:\Notebooks\19014D4SouthportOfficeDevelopmentDesign\FieldData\ExplorationLogs\CPTAnalysisFile.cptS__ __ _32Inan.lSInInVaV0araC)0012345tAO.50(sAQ5Q)6789Pressure(psi)Legend—i,2ponetratlon•[nidaldissipationVEndofdissipation(extrapolated)•Initialextmateda:t=0 APPENDIXBHistoricalHartCrowserExplorationsandLaboratoryTesting19014-04May1,2015nasHuiRTO?OWSER TestSymbolsCSGrainSizeGssificcticnCNConsalicatonuuuica.nsalidatee..,c-circdrr:ax;clCUConscldatearar:ifledir.ax:cCDConsnidoledDr&nedir’x.lCUUncon’inedCorpess.onOSDirectShearA-‘rrrecaIyPPacetPciietrsene:eAoproxmcteCompressiveStrengthin75FrvTarAoproxirnateShearStrengthinTSrCSRCcIiarnic8ecrngRatioVDMoistureDensIyReistianshipAlAtteroergLm’t5IWaterContentin°ercentI—LouaL’it——hilatural_____ ___ ___ _—Picsti:Phatcionlater,DetectorReodngChern-cciAi0isisinS;tDens:tyestnas.4keytoExplorationLogs•SampleDescriptionClossificctionofsoilsnthsreportisbasedanvisjalfeldandlaboratoryobservationswnohincludeaensity/cansisiency,moistureCondition,grainsze,andplasticityestimatesandshouldnotocconstruedtoralyheldnorlaboratorytes:ngunlesspresentedhereinVisual—manualclas&ficationmethodsofASTM02488wereusedOsanidentificationguide.Saildescriptionsconsistcithefollowing:Density/consistency,moisture,color,minorconstituents,MAJORCONSTITUENT,additionalremarks.Density/Consistency5oildan5ity/csnss:ercynbarngsisrelatedDrmcriytotheStandardPenetrationResistance.Safldensly/consistencyi”testpitsisestimc:ecoaseaonvisuctobservationandi5o’ese’tedporentneticallyontatestpitiagsStcndcrdStcndo’aAopra.inalcSAND0rGRAVEL2enetratianSILIorCLAYPenetrationShearResistance(N)esstance(N)SLen5tnDensityinBlows/FsatConsistency:n5:ows/FaatinTSrVeryloose0—4Verysoft0—2<0125>30>20Loose410Sa’t24MediumdenseID—3QMediumsF1145Dense30—SCStill5-ISVerydense>50Verystill5-300,125—0250.25—OS05—IDIC—20ristureCryLittleperceptiblemoistureDoraSamepercepibremoisture,probably0010waotrnumMoistPr000blynearoptimummoisturecontentMuchperceptiblemoisture,probablyaboveoptimumLegendsMinorConstituentsNotidentifiedindescriotonSlightly(clayey.silty,etcClayey.silty,sandy,gra’ierlyVery(cloyey,silly.etc.)EstimateaPercentcqe0—55—212—30Jo-50ISamplingrestSymbolsOCPNCSA’,IPLESSpl;tSpoonNShelbyTubejJCuttingsLCoreRun*NaSaroteReciveryPPushed,NatDrivenTESIPITSAMPLESGrab(Jar),/SapSn&bybe__zT--GroundwaterObservationsSurcc’:SeaiC-cniincteLoveanDate1I(AID)At‘ireofOiling.ElCsswsuior‘ti2ll-D0’SidledSeccc”JEIJQC’cuniwc:erSeepage:L__?CeslO.s)—ploCADlHARTCROWSERJ-745212/00FigureA-I BoringLogHC-1SoilDescriptionsApproximateGroundSurfaceElevationinFeetBrown,slighUysilty,gravelly.finetomediumSANDovermediumdense,wet,brown-gray,slightlygravellySAND.Loose,wet,gray,silty,fineSAND.Loose,wet,black,gravellySAND.Loosetomediumdense,wet,darkgray.non-gravellytoslighUygravelly,tinetomediumSAND.Mediumdense,wet,darkgray.slightlysilty.gravellySAND.MediumstifftosUll,wet,darkgraytogray,fine,sandySILT.STANDARDPENETRATIONRESISTANCETESTSSBlowsperFoot5102Am5-4•—Slightlysilty.5-56-6DepthInFeel--0‘.5--10--IS-20--25--30--‘40--45:50-.5560-:€SampleS.:5-26-3xxxxs-Is5.7xSB3<5.9x-GS-GS-CSx5—ID-S-IlMediumdense,wet,gray,silty,fineSANDwithtraceorganicmaterial0UUiIMediumstiff,wet,darkgray,slIghtlyfineDsandySILT..Mediumdensetodense.wet.gray,siltytoslightlyslLy,finetomediumSAND‘5-126.13N>(5-12S-Is•WaterContentgiPercentnINIRefertoFigureA-iforeAplanationofdescnptionsandsymbols2.Saildescriptionsandstratumlinesareinterpretiveandactualchangesmaybegradual3Groundwaterlevel,(indicated,isattime&drIling(ATD)or(ordatespecJfledLevelmayvarywithtimeaHARTCAOWSERJ-745209/00FigureA-21/2 .BoringLogHC-1SoilDescriptionsApproximateGroundSurfaceElevationinFeet:Mediumdensetodense,wet,gray.siltytoslightlysilty,finetomediumSAND.“-Stratifiedlayersoforganicmaterial.STANDARDPENETRATIONRESISTANCETESTSSamp;eABlowsperFtI25IC2050100x6.175.19xxxxDepthinFeet:65-‘70:7580--85--9095:b00105-115-120-:125BottomofBodngail2soFeet-:130Completed09/20100.1RefertoFigureAlforexplanationofdescriptionsandsymbols2Soildescriptionsandstratumlinesareinterpretiveandactualchangesmaybegradual.3Groundwaterlevel,ifndited.isattimeofdrilling(ATD)orfordatespecified.LevelmayvarywithlimeVerystifftohard,wet,gray.non-sandytofinetomediumsandySILTMediumstifftohard,wet.lightgrayCLAY.“-Tracefinesandandgravel.‘-Tracefinesand.>(8-208.215-fl3.23‘8.243-258-266.276-206.29S-Jo3-31xa‘30-0UU’&CS13C(3zax0xx•WaterContentInPercentnasHARTQ?OflSERJ-745209/00FigureA-22/2,.... .U.•..—. - BoringLogHC-2SoflDescriptionsApproximateGroundSurfaceElevationinFeet:IMPORTFILLVeryloose,moistbrownandgray,slightlygravelly,silty,finetomediumSANDwithinterbeddedsilt.OrganicsiltandfibrouspeatwithinsamplerLoosetodense,wet,gray.non-siltytoslightlysilty,finetomediumSANDwithtracescatteredgravel.‘NGradingtolesssilty.Stiff,wet,gray,fine,sandySILT,thInly\laminated“1.5feetofheaveobserved.Soft,wet,graySILT,thinlylaminated.•WatercontentinPercent1RefertoFigureAlforexplanationofdescriptinnsandsyrnbcls2.Soildescripicnsandstratumlinesareinterpretiveandactualchangesmaybegradual3Groundwaterowel.ifindicated,isattimeofdrillingtATD)ortordatespecifiedLevelmayvarywithtime.STANDARDPENETRATIONLABRESISTANCETESTSSampleaBlowsperFoot5-15-25,3xx‘‘—rracewoodfragments.‘-1.5feetofheaveobserved.S4xS-sx5-6x-o.5‘10‘20-25:°-40:°-55-60-65-Abundantorganicmaterialnoted.S-ixs-gMediumdense,wet,gray.slightlysilty,finetomediumSAND.2.5feetofheaveobserved.—InterbeddedsiltzonesandorganicmaterialnotedVerydense,wet,gray,slightlysiltytosilly,fineSAND.1.5feetofheaveobserved.‘-4feetofheaveobservedMediumdensetodense,wet,gray,slightlysiltytosilty,fineSAND.5-10x0C0uUIaCSNNC0Cz00S-IlxS.t2x5.13nKMHwTcRobnER’J-745209/00Fi’gureA-31/3 BoringLogHC-2SoilDescriptionsApproximateGroundSurfaceElevationinFeetMediumdensetodense,wet,gray,slightlysiltytosilly,lineSAND-Laminationoforganicmaterialnoted.-LIIIzonesand1-inchorganiclayer(PEAT)Mediumstifftostiff,moist,gray,slightlyfinetomediumsandytonon-sandySILT.Densetoverydense,moist,gray,siltytoverysilty,linetomediumSAND‘ -Abundandtorganicmaterial(shellfragments)noted.Verysoft,wet,gray,slightlysandytonon-sandySILTMediumstifftoverystiff,wet,gray.slightlyfinetomediumsandySILTIReferIDFigureA-iforexplanationofdescipCiunsandsynbols2.Soildescriptionsandslralumlinesareinlerpreliveandactualchangesmaybegradual.3.Groundwaterlevel,ifindicated,isaltimeofdrilling(AID)orfordatespecifledLevelmayvarywilhtime__________.srANDARDPENETRATIONRESISTANCETESTSxIOUSampleaBlowsperFoolI25105-14S-IS5-16Xx>ix5-175-18-ALS-I9DephiinFeet:65:70-.7560--85--90:100:j35-:110-‘us-120-1253Q5.20Verysoft,wet,grayCLAY.Verysofttoverysliff,wet,graySILI.-ALaC00.00,0&C8‘5CC-JC0a5-215-21B5-225-na5-235-245-25xx-AL,cNx5-26-ALx•WalerContentinPercenlna’HARTCROIflERJ-745209/00F(gureA32/3‘A:4 BoringLogHC-2SoilDescriptionsApproximateGroundSurfaceElevationinFeet:a0SMediumstifftoverystiff,wet,gray,slightlyfinetomediumsandySILT.Varyloose,wet,gray,silty,finethmediumSAND.Densetoverydense,wet,gray,slightlygravelly,finetomediumSAND.1RefertoFigureA-Iforexplanationofdescriptionsandsymbols.2.Soildescriptionsandstratumlinesareinterpretiveandactualchangesmaybegradual.3.Groundwaterlevel,ifindited,isallineofdrilling(ATD)orfordatespecifledLevelmayvarywithtine.STANDARDPENETRATIONLABRESISTANCETESTSSampleaBlowsperFootx5-27S.2S5.29xxBottomofBoringat149.0FeeLCompleted09/18/0th‘6.30xDepthrnFeet:130:135.445:450-155‘160165170175185-190‘1952•WaterConlentinPercentnasHARTcRO1ISSIIJ-745209/00FigureA-33/3 APPENDIXBLABORATORYTESTINGPROGRAMAlaboratorytestingprogramwasperformedforthisstudytoevaluatethebasicindexandgeotechnicalengineeringpropertiesofthesitesoils.Bothdisturbedandrelativelyundisturbedsamplesweretested.Thetestsperformedandtheproceduresfollowedareoutlinedbelow.SoilClassificationFieldObservationandbborataryAnalysis.Soilsamplesfromtheexplorationswerevisuallyclassifiedinthefieldandthentakentoourlaboratorywheretheclassificationswereverifiedinarelativelycontrolledlaboratoryenvironment.Fieldandlaboratoryobservationsincludedensity/consistency,moisturecondition,andgrainsizeandplasticityestimates.Theclassificationsofselectedsampleswerecheckedbylaboraton’testssuchasAtterberglimitsdeterminationsandgrainsizeanalyses.ClassificationsweremadeingeneralaccordancewiththeUnifiedSoilClassification(USC)System,ASTMD2487,aspresentedonFigure8-1.WaterContentDeterminationsWatercontentsweredeterminedformostsamplesrecoveredintheexplorationsingeneralaccordancewithASTMD2216,assoonaspossiblefollowingtheirarrivalinourlaboratory.Watercontentswerenotdeterminedforverysmallsamplesnorsampleswherelargegravelcontentswouldresultinvaluesconsideredunrepresentative.Theresultsofthesetestsareplottedattherespectivesampledepthontheexplorationlogs.Inaddition,watercontentsareroutinelydeterminedforsamplessubjectedtoothertesting.Thesearealsopresentedontheexplorationlogs.GrainSizeAnalysis(GSGrainsizedistributionwasanalyzedonrepresentativesamplesingeneralaccordancewithASTMD422.WetsieveanalysiswasusedtodeterminethesizedistributiongreaterthantheU.S.No.200meshsieve.TheresultsofthetestsarepresentedascurvesonFigures8-2and83plottingpercentfinerbyweightversusgrainsize.HartcrowserPage8-1I-7452 AtterbergLimits(AL)WedeterminedAtterberglimitsforselectedfine-grainedsoilsamples.TheliquidlimitandplasticlimitweredeterminedingeneralaccordancewithASTM134318-84.TheresultsoftheAtterberglimitsanalysesandtheplasticitycharacteristicsaresummarizedintheLiquidandPlasticLimitsTestReportFigures84through8-7.Thisrelatestheplasticityindex(liquidlimitminustheplasticlimit)totheliquidlimit.TheresultsoftheAtterberglimitstestsareshowngraphicallyontheboringlogsaswellaswhereapplicableonfigurespresentingvariousothertestresults.ConsolidationTest(CN)Theone-dimensionalconsolidationtestprovidesdaLaforestimatingsettlement.ThetestwasperformedingeneralaccordancewithASTM132435.Arelativelyundisturbed,fine-grainedsamplewascarefullytrimmedandfitintoarigidringwithporousstonesplacedonthetopandbottomofthesampletoallowdrainage.VerticalloadswerethenappliedincrementallytothesampleinsuchawaythatthesamplewasallowedtoconsolidateundereachloadincrementMeasurementsweremadeofthecompressionofthesample(withtime)undereachloadincrement.Reboundwasmeasuredduringtheunloadingphase.Ingeneral,eachloadwasleftinplaceuntilthecompletionof100percentprimaryconsolidation,ascomputedusingTaylor’ssquarerootoltimemethod.Thenextloadincrementwasappliedsoonafterattaining100percentprimaryconsolidation.Forselectedtests,loadswereleftin.placeforaslongas24hourstorecordsecondaryconsolidationcharacteristics.Thetestresultsplottedintermsofaxialstrainandcoefficientofconsolidationversusappliedload(stress)arepresentedonFiguresB-Band8-9.F\docsabs\7$52\Sotrhportreport.docHancrowserPage8-2J-7332 UnifiedSoilClassification(USC)SystemNumberatMeshperInch(USStandard)GrainSizeinMillimetresCoarseGrainedSofls>50%largerthanNo200sieve>4forGWSWandSWI—D,0/>6forSW&1<(i?2—3\D,QXD;SPandSPCleanGRAVELorSANDnotmeetingrequirementsfarSWandSWGMandSMAtterberghrnitsbelowAlinewithP1<4SCandSCAtterberglimitsaboveALinewithP1>7*Coarse-grainedsoilswithpercentageoffinesbetweenSand12areconsideredborderlinecasesrequireduseofdualsymbolsD0,D.andDaretheparticlesdiameterofwhich10,30.and60percent,respectively,ofthesoilweightarefinerFine-GrainedSoilsSoilGrainSizeSizeofOpeningInInchesSia-c3?SIIIliiiIIItILIiiIIp!I.ILII’ItI.,1.I..III—nCNGrainSizeinM,E!,melresCOESLESGRAVELSANDSILTandCLAYCoarse.GranedSoils—-IF:ne-GrajnedSoilsCoarse-GrainedSoils.GWfGPGMGCSWSP.SMSc’,(*>.CleanGRAVEL<5%hnes1GRAVELv.ith>12%fhesCleanSAND<5%f:nesSANDwith>12%tinesGRAVEL>50%coarsetractionlargerthanNo,4SAND‘50%coarsefractionsm&erthanNo4MLSILTCLOLMHCHCLAYOrganic,StT-.ICLAY60Highly_____ _ _ ______ ____ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ - --. -OrganicSoilsw;:hLiqu:dLimit:50%SoilswilhL’quidLint>50%Soilsine-Grg:nedSoils>50%smaierIflanNo200sieveOHSQPtOrganic40a,0C0U,Ita-30201006050403020100Q10203040506070Liqu:dLimitMaHARTCROWSS6090100J-745212/00Figure8-1 CQ.Qbo.oAl0.0¶4GRAVEL%SAND¶4FINES¶4+3”CR5.FINECR5._[MEDIUMFINESILTCLAY18.644.91520.642.149.612.045.520.2LLxl0,012.40.00.00.016.8gI__________5.641.771210.6300.3760.2950.7659900.6890.4400.3890.3080.2230.1351.593.25a5.921.230.8710.4850.2820.1990.966.16MATERIALDESCRIPTIONUSCSNAT.MOIST.CGravellySANDSP16%DSlightlysiltymediumtormeSANDSP-SM31%ASlightlysilty.ave1lySANDSP-SM16%Remarks:Project:Southport0gClient:aoSource:HC-1SampleNo.:5-3oSource:HC-1SampleNo.:5-6aSource:HC-1SampleNo.:S-Sna—J-745210/4/2000ITCRQWSS?FigureNo.B-2P1Das060D50Do2.97.75.5D1sD10CcCuPARTICLESIZEDISTRIBUTIONTESTREPORTUzU-HzLuaUa-GRAINSIZE-mm LUzLAI—zLUUU0Cx0CLLPARTICLESIZEDISTRIBUTIONTESTREPORTV.GRAVELV.SAND%FINES%+3”CR5.FINECR5.MEDIUMFINESILTCLAY0SAND0.00.00.00.0P13.104D351.14j0.5056.22.340.547.32.937.152.67.6D500.42403140.7620.4240.3630.2670.1770.1200is0.2380.201C0.9740SPCSlightlysilty,mediumtofineSANDSP-SM21%23%LGRAINSIZE-mmCu2.51MATERIALDESCRIPTIONIUSCSNAT.MOIST.3.52Remarks:Project:SouthponCClient:0Source:HC-1SampleNo.:S-3CSource:HC-2SampleNo.:S-5na,.1-745210/4/2000H.’rsr_RowcrRFigureNo.8-3L LIQUIDANDPLASTICLIMITSTESTREPORT0ztCI—0a-Location+DescriptionUQUIDUMITPLH-200uscs•Source:lit-iSampleNo.:5-21.1195960MHElasticSIT•Source:HC-1SampleNo.S-25CLAY382216CLASource:HC-ISampleNo.:S-JOCLAY382414CLRemarks:Project:Southpon.IAClient:Location:Renton,WAbnMsJ-745210/5/2000HfiSTCRQWSERFigureNoB-4 _____________ri—LIQUIDANDPLASTICLIMITSTESTREPORT///////AZZ’MLorCLVIPLocation+DescriptionLLPLP1-200USCS•Source:HC-ISampleNo.:S-27FatCLAY692841CHRemarks:Project:Southpon.Client:Location:Renton,WAnn3-74529/29/2000‘HARTCROWSERFigureNo.6-5a///6060—40-30-20107Dashedlineindicatestheapproximateupperlimitboundaryfornaturalsoils///z0zciIU,074V/1////711030507090MHorOHLIQUIDLIMIT LIQUIDANDPLASTICL!MITSTESTREPORTISource:HC-ISampleNo.:5-27FatCLAY692841CH0z0IU,50emarks:Project:Southport.Client:Location:Reman,WA.nl3-74529/29)2000H._TOWWSERFigureNo.B-sLocation•DescriptionLIQUIDLIMITLLPLP1-200USCSC- ‘CUiCz0I-CDLIQUIDANDPLASTICLIMITSTESTREPORTLIQUIDLIMITLocation+DescriptionLLPLP1-200USCS•Source;HC-2SampleNo.;5-17824537MMElasticSILTKSource;HC-2SampleNo,:S-21.543024Vn{ElasticSILTASource’HC-2SampleNo,;5-25SILT382513MIRemarks:Project:Southpor..AClient:Location:Renton,WAn1S1-745210/5/2000HARTCROWSERFigureNo,8-6—[EJ LIQUIDANDPLASTICLIMITSTESTREPORT•Source:HC-2SampleNo:S-22bFatCLAY542529CHRemarks:Project:SouthportClient:Location:Renton,WAnaHARTCROWSERJ-7452FigureNo.8-7U9/22/20000zaIU,0-Location+DescriptionLIQUIDLIMITLLPLP10-200usCsCD— CtototoxtoVC0to00LAC0U0aUCONSOLIDATIONTESTRESULTSStress(tonslft2)Expi.SampleDepthW.C.%AtterbergLimitWetWtUSCDescriptionNo.No.(it)BeforeAfterLLPLP1(pcf)HC-15-27109-111’57%47%692841110pciCHFatCLAYRemarks:nnJ-74529/29/20(Ii/J?Tc??Ofr1rSEI?Figure8-81/321/161/81/61/2124816320.000.050.100.150.200.250.000.200.400.600.801.001.20 CONSOLIDATIONTESTRESULTSStressltonsflt2)CCoIU,to‘C0.000.050.100.150.200.250.400.600.801.001.201/321/161/81/2126816320.000.20to•0‘.4C0to•00U,C0U00)0UExpi.SampleDepthW.C.%AtterbergLimitWetWtUSCDescriptionNo.No.Ut)JBeforeAfterLLPLP1(pcI)HC-2S-22b12.5-115.d56%40%542529110pcfCHFatCLAY‘Remarks:Ifln.1-74529/21/2000IIttItTCRO14sERFigure8-9 LIQUIDANDPLASTICLIMITSTESTREPORTLocation+DescriptionLLPLP1-200USCS•Source:HC-2SampleNo.:S-17.824537ElasticSITBSource:HC-2SampleNo.:S-21.543024MI-IElasticSITASource:HC-2SampleNo..5-25SIT382513NaRemarks:Project:Southport.BAClient;Location;Renton,WAnMl3-745210/5/2000HIRTO?OWSERFigureNo,B-6S//Dashedlineindicatestheapproximateupperlimitboundaryfornaturalsoils//////wCz0ICD0-6050—40-30-20—10747V.///1—IMLorOLMHo10305070901rOHLIQUIDLIMITha...- LIQUIDANDPLASTICLIMITSTESTREPORT•Source:HC-2SampleNo.:S-22bFatCLAY2529CHemarks:Project:SouthponSClient:Location:Renton,WArNJnn3-74529/22/2000HARTCROWSERFigmeNo.6-70Location+DescriptionLIQUIOLIMITLLPLP1-200 CONSOLIDATIONTESTRESULTSStress(tons/ft2)C,0@4C0m-CaU,C0U0di0UExpl.SampleDepthW.C.%AtterbergLimitWetWtUSCDescriptionNo.No.(ft)BeforeAfterLLPLPt(pcf)HC-1S-27109,-iii’57%47%692841110cfCHFatCLAYRemarks:nJ-74529/29/20(If/U?TC)?OI4(S.EI?Figure8-81/321/161/81/61/212481632CC,U,Co‘C0-000.050.100.150.200.250.000.200.400.600.801.001.20 >.C,-CC.’CCC,-C0U,C00000CONSOLIDATIONTESTRESULTSStress(tons/1t2)nMaHñR1/321/161/81/61/212681632CI,CoC,N0.000.050.100.150.200.250.000.200.400.600.801.001.Z0--Ir——7.J/----————-Expl.SampleDepthW.C.%AtterbergLimitWetWtUSCDescriptionNo.No.Ut)BeforeAfterLLPLP1(pcI)RC-2S22b12.5-115.156%40%542529110pcICRFatCLAYRemarks:IJ-7452FigureB-99/21/2000r- LIQUIDANDPLASTICLIMITSTESTREPORTLocation+DescriptionLLPLP1-200JUSCS•Source:HC-2SampleNo.:5-17.824537MHElasticSILT•Source:HC-2SampleNo.:S-21.543024ElasticSILTASourceHC-2SampleNo.:S-25SIT382513Nfl.Remarks:Project:Southport..AClient:Location:Renton,WAnaN3-745210/5/2000HIIRTCROWSEI?FigureNo.B-6a//V/Dashedlineindicatestheapproximateupperlimitboundaryfornaturalsoils//6050—40—wC[a1074/AFI’07’//VI//////A/I77’;’10MLorOLMHorOH30507090LIQUIOLIMIT LIQUIDANDPLASTICLIMITSTESTREPORT10305070LIQUIDLIMITLocation+DescriptionISPtP1__[__-200•Source:HC-2SampleNo.:S-22bFatCLAY542529CHemarks:Project:Southport.Client:Location:Renton,WAfln3-74529/22/2000HARTCROWSERFigweNoB-7//Dashedlineindicatestheapproximateupperlimitboundaryfornaturalsoils///6050—40—01074/-zV///////,‘Vz7!IMLqrOLMHorOH90110a CONSOLIDATIONTESTRESULTSStress(tonslft2)0C0It00toC0U0CCEcpI,SampleDepthW.C.%AtterbergLimitWetWtUSCDescriptionNo.No.Pt)BeforeAfterUPLFl(pet)HC-1S-27109-11157%47%692841110pcICIIFaiCLAYRemarks:InnJ-74529/29/2CCIIAJ?TC??OlltSEllFigureB-B1/321/161/61/61/212461632CCaUIItx0.000.050.100.150.200.250.000.200.400.600.801.00L20 CU,‘Cto0C,’C0C,-c0U,C0U0V0UCONSOLIDATIONTESTRESULTSStress(tonsltt2)1/321/161/81/61/2126816320.000.050.100.150.200.250.000.200.600.600.801.001.20Expk.SampleDepthW.C.%AtterbergLimitWetWtUSCDescriptionNo.No.(tOBeforeAlterLLPLP1(pct)HC-2S-22b12.5-115.56%40%542529110pcICHFatCLAY‘Remarks:ImaJ-74529/21/2000IIILRTc7IOIItSEI?FigureB-9LJJ nIsHeiRTO?OWSERAPPENDIXCHistoricalExplorationsbyOthers19014-04May1,2015A APPENDIXCHISTORICALEXPLORATIONSBYOTHERSInadditiontotheexplorationsandlaboratorytestresultspresentedinAppendicesAandB,previoussoilexplorationsandlaboratorytestsbyHartCrowserandotherswereusedtogainanunderstandingofthesubsurfaceconditionsatthesite.ThelocationsoftheexplorationsbyothersincludedinthisappendixareshownonFigure2.TheselogsandlaboratorytestsarepresentedforreferenceonlyandHartCrowserisnotresponsiblefortheiraccuracyorcompleteness.nasHARTOZOWSER..19014-04May1,2015 457-becomesverylooseBORINGIISCONTINUEDONNEXTPAGE,PLATE4GEOTECHCONSULTANTS,LNC.BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonJob:Date:Loggedby:Plate:99Q37February1999SES3J-745212/00GravelDescriptionDarkbrown,gravellySAND,fine-tomedium-grained,moist,loose-becomeswetiF23JulSMIIIDarkgray,siltySAND,fine-tomedium-grained,wet,veryloosei-uMLLightgraySILT,lowplasticity,wet,veryloose-becomesgray-green5118642Lightgray,gravellySAND,medium-tocoarsegrained,wet,loose101520—25-30—35—40—Lightgraytobrown,slightlysandySILT,lowplasticity,wet,verylooseAFigureC-i1/4 Description6065707580-containssomesiltlayersLightgray,siltydenseSAND1Lightgray,siltySANDwithinterbeddedsiltlayers,fine-tomedium-grained,wet,medium-dense-becomesveryloose.BORINGI/SCONTiNUEDONNEXTPAGE,PLATE5-GEOTECHCONSUL1Ar4TS,INC.—Job:Date:99037FebruaryLoggedby:Plate:iggSESJ-7452FigureC-i12/002/445DarkgraySAND,medium-grained.wet,veryloose50.55fine-tomedium-grained,wet,medium-a,BORINGLOG1101LakeWashingtonBoulevardNorthRenton,Washington ncinii’a,icu,iuiiueuLightgray,siltySANDinterbeddedwithsiltlayers,fine-tomedium-Date:Loggedby:Plate:L99037February1999______SES_________4590‘pDescHpticaLightgraySILT,lowplasticity,wet,veryloosegrained,wet,medium-dense18ense95Lightgray,siltySANDinterbeddedwithsandgrained,wet,medium-dense19IiLiiIlayers,fine-tomedium-becomes100dense20-becomesverylooseLightgray.21clayeySILT,medium-plasticity,wet,soft11022115sandlensesnoted23120DoseBORINGIFSCONTINUEDONNEXTPAGE,PLATE6-GEOTECHCONSUL1’ANi’S,INC.BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtoniiJ-745212/O(Figurec-i3i ‘V125c,%t&”#s°€1‘3IIIII1%JI.flJI‘LIIIL1tjDescriptionLightgray,slightlyclayeySILT,lowplasticity,wet,soft.-GEOTECHCONSULTANTS,INC.11BORINGLOG1101LakeWashingtonBdulevardNorthRenton,WashingtonJob:Date:Loggedby:Plate:99037February199gSES6J-7452FigureC-I12/CC4/4._130Lightgray,sHghtlysiltySAND,fine-grained,wet,medium-densetodense135140145-becomesfine-tomedium-grainedI50-becomesverydense155*Testboringwasterminatedat151.5feetduringdrillingonFebruary16&171999.*Groundwaterseepagewasencounteredat3feetduringdrilling.160 ‘3,‘°•‘$FILLGraveloverLightbrown,sandySILTwithgravel,lowplasticity,moist,loose(FILL)Darkbrown,sandySILTinterbeddedwithsandlayers,verymoist,verylooseLightgraySANDwithgravel,medium-tocoarsegrained,wet,loose-becomesfine-tomedium-grainedBORING2ISCONTINUEDONNEXIPAGE,PLATESGEOTECHN’CONSULTANTS,INC.BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonJob:Date:Loggedby:Plate:99037February1999SESj7J-7452FigureC-212/001/3SQQ’jOtJflhIM3LDescriptionVPush41074Push65101520—303540—1237 -becomeslooseBORING2IsCONTINUEDONNEXTPAGE,PLATE9SjGEOTECHCUNSULI’AN1’S,crc‘13ADate:Loggedby:Plate:L99O37Febtuar,1999SESJ-7452FigureC-22/3I_,’_,,%II4’’s—‘—‘si‘“I‘‘-fl—tiDescription-somegravelnoted,medium-dense.Q.“9)%45—50M=50.8%55—60—6570118234°2244Lightgray,siltySANDinterbeddedwithsiltlayers,fine-tomediumgrained,verywet,looseLightbrownish-gray,slightlysandySILT,lowplasticity,interbeddedwithsandlayers,wet,verylooseIII-nosandlayersILightgraySAND,fine-tomedium-grained,wet,denseiib121314i5Lightbrownish/greenish-gray,slightlysandySILT,lowplascity,wet,verylooseLightgraySAND,fine-tomedium-grained,wet,medium-densehLHGreenish-gray,slighilysandySILT,lowplasticity,we!,verylooseiijGray,siltySANDinterbeddedwithsandlayers,fine-tomedium-grained,wetBORINGLOG1101LakeWashingtonBoulevardNorthRenton,Washington‘tS)*Sn*]- Gray,slightlygravellySAND.fine-tomedium-grained,wet,verydenseLightgray,slightlysandySILT,wet,medium-dense95100—120—*Testboringwasterminatedat91.5feetduringdrillingonFebruary24,1999.•Groundwaterseepagewasencounteredat9feetduringdrilling.AGEOTECHCONSUL!’ANTS,INC.BORINGLOG1101LakeWashingtonBdulevardNorthRenlon,WashingtonJob:Date:Loggedby:Plate:99037February1999SES9IsJ-7452FigureC-212/003/35\0\€‘w’s&M=25.4%S‘SJ1’iII’4’.3Lt,OIliiiIUCUDescriptioftense1611714184.859018181Li —________________________________&flijtidt3sQq’4,EPDescriptionGraveloverFILLLightbrown,stySANDwithsomegrave!.Tine-tomedium-grained,verymoist,loose(FILL)5Push1SLightgray,siltySAND,fine-grained,wet,verylooseLightgraySAND,mediumtocoarse-grained,wet,loose826320—1142575g46-becomesfine-tomedium-grained3517HILightgrayish-brown,slightlysandySILT,lowplasticity,wet,verylooseI]71tJ-becomessandierBORING3IsCONTINUEDONNEXTPAGE,PLATE11BORINGLOGGEOTECH1101LakeWashingtonBoulevardNoahCONSULTANTS,INC.Renton,WashingtonAJob:Date:Loggedby:Plate:—.99037February199956J-745212/00FigureC-3_______--a. I—’—IiI%d,J\\(.__ __ _ _ _ __f9Description28j(continuedfrompreviouspage).11YLL1iJ___ ____ _ ____ _ ____ _ ____ _ ___LightgraySAND,fine-tomedium-grained,wet,medium-denseLightgray,sandySILTinterbeddedwithlayersofsand,lowplasticity,wet,veryloose5021QLightgray,graveflySAND,medium-tocoarsegrained,wet,medium-48densetodense60342970271423i5Lightgray,siltySAND,fine-tomedium-grained,wet,medium-denseIll______________________________________80__!BORING3ISCONTINUEDONNEXTPAGE,FLArE12BORINGLOGGEOTECH1101LakeWashingtonBoulevardNohCONSULTANTS,INC.Renton,WashingtonAJob:Date:Loggedby:Plate:99037February1g99SES11J-745212/00FigureC-32/4 85‘.,o’S‘3Description90Lightgray,denseslightlygravellySAND,medium-tocoarsegrained,wet,veryIJob:Date:Loggedby:Plate:L99037February1999SES12’—95-lessgravelLightgraySAND.fine-tomedium-grained,wet,verydense-becomessiltyandmedium-denseLightgray,clayeySILT,medium-plasticity,wet,stiffbecomessoft120GEOTECHCONSULTANTS.INC.A-BORING3ISCONTINUEDONNEXTPAGE.PLATE13BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonJ.745212/00FigureC-33/4 (continuedfrompreviouspage)LightgraySAND,tine-tomedium-grained,wet,dense-becomescoarser,verydenseTestboringwasterminatedat146.5feetduringdrillingonFebruary24&25,1999.*Groundwaterseepagewasencounteredat7feetduringdrilling.GEOTECHxcCONSUL1’ANTS,INC.BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonJob:Date:Loggedby:Plate:[99037February1999SES13J-745212/00&OLJflhIN30t.UIILIIIUeUQo4OsDescription‘ML2412526127F-becomesmedium-stiff-becomessoft162405257125—130—135—140—CE150155160—26E29FigureC-34/4 5\(‘‘5,,a%O\fvc?çO’40—V1025FILLLightbrown,siltySANDwithgravel,extensiveorganics,fine-grained,verymoist,loose(FILL)LightgraySAND!medium-tocoarsegrained,wet,loose-becomesmedium-dense-becomesfine-tomedium-grainedLightbrown,sandySILTinterbeddedwithsandlayers,lowplasticityBORiNG4ISCONTINUEDONNEXTPAGE,PLATE15ttCONSUL1’ANTS,INC.,i,’A-----Job:Date:[_99037FcbruarLoggedby:Plate:¶399SESJ-745212/00FigureC-41/3C,e’BORING4Grave!overDescription576S1420—-withsomegravel-becomesgravelly4137-withtraceofsilt[IHwet,verylooseBORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonL..’r--- •%;-Desthpdon-.M=51.7%2(continuedfrompreviouspage).456p-becomeslightgray50M=221%27Lightgray,gravellySAND,medium-tocoarsegrained,wet,medium-dense38ii-becomesdense12-becomesfine-tomedium-grained,medium-dense1313-becomesgraveHy706-becomesmedium-tocoarsegrained,loose2815-becomesmedium-denseGreenish-gray,sandySILT,lowplasticity,wet,veryloose80—BoRING4ISCONTINUEDONNEXTPAGE,PLATE16-.BORINGLOGGEOTECH1101LakeWashingtonBoulevardNoh-CONSULTANTS,INC.-Renton,Washington_____________________________________[rb:1D:re:1Laggedby:Plate:J-745212/00FigureC-42/3. _FI‘II‘——T%,.s..I•t.%.’..DescriptionGray,gravellySAND,fine-tocoarse-grained,wet,verydense.120Testboringwasterminatedat96.5feetduringdrillingonFebruary•Groundwaterseepagewasencounteredat4.5feetduringdrilling.18,1999.GEOTECHCONSULTANTS,INC.BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonJob:Date:Loggedby:Plate:L99037February1999SES16J-7452FigureC-43/3 51020Vt-WIS.‘OLightgray,siltySAND,fine-tomedium-grained,moist,verylooseLightgraySAND,fine-tomedium-grained,wet,loose-withtracegravel,medium-dense3035401,4%Lightgray,sandySILT,lowplasticity,wet,verylooseBORING5ISCONTINUEDONNEXTPAGE,PLATE18aGEOTECFJCONSULT1NTS,INC.BORINGLOG1101LakeWashingtonBoulevardNorthRenton,WashingtonJob’Date:Loggedby:Plate99037February1999SES17J-7452FigureC-512/001/2ar,o0ss6r’bUKINtSDescription15 i’52rri-becomessandyrkgray,gravelly,siltySAND,medium-tocoarsegrained,wet,medium-denseGEOTECHCONSUUI’ANiS,INC.Job:Date:-Loggedby:L99037February‘99LSESPlate:J-745212/00,p‘,‘&49DJFlIMLDCUIILIIIUUUDescription45-withtracegravel,loose-becomesmedium-grained,medium-dense.DarkgraySILT,lowplasticity,wet,veryloose-becomesolive/greenish-gray-becomesdensetoverydense.Testboringwasterminatedat76.5feetduringdrillingonFebruary18&19,1999.BORINGLOG1101LakeWashingtonOduievardNorthRenton,WashinglonFigureC-S2/2 GEOTECHCONS1TLTArnS,INC.JobNo:Date:Plate:99037-1ApriI1919J-745212/00FigureC-6C0aaaCC00CaCCCCCVaI•E2•Ea=-0Ea—CCCEEH0nflU’CaCaVC0CaCaa-CU,UCaCCaCCVE0CBaz-C0oaCVCC-C‘Ia-s0VCa‘I,CCaVEVaC0-C0,0aCaCCaEaUCVa-J‘9CCC0Ii,rI-iaC9RB82B070aC0IS-___ ___ _U,0aCa4I,—C=‘“C=0.4C0-IaCE0o9782B.C-.4cm--0,U,CONEPENETROMETERTEST11D1LakeWashingtonBoulevardNorthRenton,Washington Co0—aaCCaCC-D—.-•—C—CCCC—CaEc=2•>oCo-D-V0Cc—aEE=1—0-I—c<2COE—>--ø,.-—•000C>.z•z.-Cug-9I,(3‘.9CCCCV0CaCC-DSztOaCiS-a-—o—•zd<:°‘:£>-S%UVC—UCU=aennU,JobNa:Thte:Plate:99037-1April192O”,-J-7452FigureC-iVCI—-sen0CUCaCCVSVCSCzenenCaCCVSVCS0z-C00C;11—UC9B2CCC0UILU,0C•UC•a-I•CtoUCItCI.C0U.S000C,9B2BR-a2iU•JO0C39BGEOTECHCONSUL1ANTS,LNC.CONEPENETROMETERTEST1101LakeWashingtonBoulevardNorthRenlon,Washington 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II—00*1UCaI,a—CI,aaC0U92519251$1GEOTECHC()NSLII;FAN1S,INC.JobNo:Date:Plate:L_29037-1April199926ç—)J-7452FigureC-1312/00C0aaaC0a,aD0CEaaaIJa,0Ca0,aaCC00aCCa•0k0C£Cza,‘Ia,CCCa0S0a£0z-CU,>1a’CaCC030CSCz-Ca,UaCCaSa0CzCa,aCaSCaS0UanaI4a,VCa0.aaCaV0aaCa0S3•0CS0z-C00aCa-aaVCa0aCCSaUCnaI—-s0aa0aaCaVCCz-C0‘I.-—aaICCUIA.0U,0S0988251=a3aIi4’0aCONEPENETROMETERTEST1101LakeWashingtonBoulevardNorthRenton,Washington ATTACHMENTIConePenetrationTestResultsna19014-04HCtRTcROWSERMay1,2015 nanunowsenOperator:BrownSounding:CPT-O1ConeUsed:DDG123SMaximumDepth=4.76feetOPTDate/Time:4/21201510:57:10AMLocation:SouthportOfficeDevelopmentJobNumber:1901404DepthIncrement=0.164feet2organicmaterial13clayInsituEngineeringTipResistanceOcTSFFsJQc(%)0300012-20FrictionRatioPorePressurePwPSIIIII1200IIIIISoilBehaviorTyp&Zone:UBC-198311111IiIIIIFIIIII!’’I’ll11:11:111III1—I_I-.I-IJ.L4-—II.’::’II.’!liii’II1111111IIPItP.I I IIILP 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harttrowserOperator:BrownSounding:CPT-01ConeUsed:DDG1238OPTDate/Time:4/2/201511:47:38AMLocation:SouthportOlliceDevelopmentJobNumber:19014041sensitivefinegrained2organicmaterial13clayInSituEngineeringMaximumDepth=83.83feet14siltyclaytoclay•5clayeysilttosiltyclay16sandysilttoclayeysiltDepthIncrement=0.164feet•7siltysandtosandysilt8sandtosiltysand0FrictionRatioTipResistancePorePressureCcTSFFs/Qc(%)0300012-2D10SoilBehaviorTypePwPSIZone:UBC-19831200120SPTN60%Hammer90203040506070IIIIIIIIII I I I I IIIII 9IrV19I8090.•10gravellysandtosand1jiverystillfinegrainedfl•12sandtoclayeysand()19sand 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IILI1111111I IIIIIL11111 IIIILL L—ILJJI_LJLLJ111111LLJ23 IIII11111 II•IIII-10L1-101001000Time:(seconds) DataFile:HCCPT-014/2/201511:47:38AMOperator:BrownLocation:SouthportOfficeDevelopmentConeID:DDG1238JobNo.:1901404Cymer:UNITS:EnglishDEPTHTIMEDISSIPATIONOFPOREPRESSURE(psi)(ft)(sec)(psi)83.990-4.76583.991-4.85183.992-4.42683.993-4.86583.994-5.29983.995-6.69983.996-6.76883.997-7.05883.998-6.90483.999-6.82183.9910-6.77183.9911-6.73083.9912-6.68383.9913-6.39883.9914-5.82183.9915-5.01483.9916-4.13883.9917-3.194r918-2.0588S419-0.82983.99200.39083.99211.80183.99223.50083.99235.25483.99247.06483.99259.01283.992610.83583.992712.16483.992813.65883.992915.69483.993017.96883.993120.68183.993222.91883.993324.99983.993426.99983.993528.62683.993630.00783.993731.02983.993831.86183.993932.56383.994033.041824133.44783i94233.74283.994333.96183.994434.143 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DataFile:HCCPT-064/3/20159:22:55AMOperator:BrownLocation:SouthportOfficeDevelopmentConeID:DDG1238JobNo.:19014041jomer:UNITS:EnglishDEPTHTIMEDISSIPATIONOFPOREPRESSURE(psi)(ft)(sec)(psi)21.9807.11621.9817.16321.9827.18321.9837.15821.9847.73221.9857.38721.9867.26621.9877.22421.9887.20221.9897.18021.98107.16621.98117.16921.98127.16121.98137.15821.98147.15221.98157.14721.98167.14721.98177.14127’S187.144197.14421.98207.14421.98217.14421.98227.14421.98237.13921.98247.13921.98257.14421.98267.15021.98277.14121.98287.14121.98297.14421.98307.14421.98317.14421.98327.14721.98337.15021.98347.15221.98357.14421.98367.15821.98377.14721.98387.15021.98397.15821.98407.158$417.1612:cS8427.16321.98437.16621.98447.158 21.98457.16321.98467.16321.98477.16321.98487.17221.98497.17721.98507.18021.98517.18321.98527.18021.98537.18321.98547.18321.98557.18521.98567.18521.98577.19421.98587.19721.98597.20221.98607.20521.98657.21321.98707.22721.98757.23221.98807.25221.98857.26321.98907.279.. COUGHLINPORTERLUNDEENSTRUCTURALJVILSEISMICENGINEERINGAppendixCSTORMWATERPOLLUTIONPREVENTIONPLAN(SWPPP)THEHOTELATSQUTHPORT28r;. .. nStormwaterPollutionPreventionPlanForSouthportOfficePreparedForNorthwestRegionalOffice3190-160thAvenueSEBellevue,WA98008-5452425-649-7000OwnerDeveloperOperator/ContractorProjectSiteLocationRenton,WashingtonCertifiedErosionandSedimentControlLeadTBDSWPPPPreparedByCoughlinPorterLundeen801SecondAveSuite#900Seattle,WA98104(206)343-0460ChaseBlood,CivilEngineerSWPPPPreparationDate6/17/2015ApproximateProjectConstructionDatesTBD nContents1.0Introduction.12.0SiteDescription32.1ExistingConditions32.2ProposedConstructionActivities33.0ConstructionStormwaterBMPs53.1The12BMPElements53.1.1Element#1—MarkClearingLimits53.1.2Element#2—EstablishConstructionAccess53.1.3Element#3—ControlFlowRates63.1.4Element#4—InstallSedimentControls63.1.5Element#5—StabilizeSoils73.1.6Element#6—ProtectSlopes83.1.7Element#7—ProtectDrainInlets83.1.8Element#8—StabilizeChannelsandOutlets93.1.9Element#9—ControlPollutants93.1.10Element#10—ControlDewatering113.1.11Element#11—MaintainBMPs113.1.12Element#12—ManagetheProject115.0PollutionPreventionTeam175.1RolesandResponsibilities175.2TeamMembers176.0SiteInspectionsandMonitoring196.1SiteInspection196.1.1SiteInspectionFrequency196.1.2SiteInspectionDocumentation196.2StormwaterQualityMonitoring206.2.2pHSampling207.0ReportingandRecordkeeping237.1Recordkeeping237.1.1SiteLogBook237.1.2RecordsRetention237.1.3AccesstoPlansandRecords237.1.4UpdatingtheSWPPP237.2Reporting247.2.1DischargeMonitoringReports247.2.2NotificationofNoncompliance247.2.3PermitApplicationandChanges24II F)AppendixA—SitePlans.25AppendixB—ConstructionBMPs26AppendixC—AlternativeBMPs27AppendixD—GeneralPermit29AppendixE—SiteInspectionForms(andSiteLog)30AppendixF—EngineeringCalculations39AppendixASiteplansAppendixBConstructionBMPsAppendixCAlternativeConstructionBMPlistAppendixDGeneralPermitAppendixESiteLogandInspectionFormsAppendixFEngineeringCalculations‘H StormwaterPollutionPreventionPlan1.0IntroductionThisStormwaterPollutionPreventionPlan(SWPPP)hasbeenpreparedaspartoftheNPDESstormwaterpermitrequirementsfortheSouthportOfficeconstructionprojectinRenton,Washington.ThesiteissiwatedatthesoutherntipofLakeWashingtontothewestoftheGeneCoulonMemorialBeachPark.ThesiteisintheNW¼oftheNW¼ofSection8,Township23North,Range5East,WillametteMeridian.Thesitewilloccupyparcels0823059216,withanareaof245,086-SF,respectively.Theexistingsiteconsistsof1.87acresofimpervousareaand3.48acresofperviousarea.Overall,theproposedprojectwillincludea3-towerofficebuildingwithparkinggarageandgeneralsiteimprovementsincludinglandscaping.Theproposedconditionswillconsistofapproximately4.95acresofimperviousareaand0.40acresofpeiwiousarea.Constructionactivitieswillincludedemolition,excavation,grading,relocationofonsiteservices/utilities,constructionofahigh-riseofficecomplexwithassociatedparkingandlandscaping.ThepurposeofthisSWPPPistodescribetheproposedconstructionactivitiesandalltemporaryandpermanenterosionandsedimentcontrol(TESC)measures,pollutionpreventionmeasures,inspection/monitoringactivities,andrecordkeepingthatwillbeimplementedduringtheproposedconstructionproject.TheobjectivesoftheSWPPPareto:I.ImplementBestManagementPractices(BMPs)topreventerosionandsedimentation,andtoidentify,reduce,eliminateorpreventstormwatercontaminationandwaterpollutionfromconstructionactivity.2.Preventviolationsofsurfacewaterquality,groundwaterquality,orsedimentmanagementstandards.3.Prevent,duringtheconstructionphase,adversewaterqualityimpactsincludingimpactsonbeneficialusesofthereceivingwaterbycontrollingpeakflowratesandvolumesofstormwaterrunoffatthePennittee’soutfallsanddownstreamoftheoutfalls.ThisSWPPPwaspreparedusingtheEcologySWPPPTemplatedownloadedfromtheEcologywebsiteonDecember17,2014.ThisSWPPPwaspreparedbasedontherequirementssetforthintheConstructionStormwaterGeneralPermitandStormwaterManagementMantialforWesternWashington(SWMMWW2005).Thereportisdividedintosevenmainsectionswithseveralappendicesthatincludestormwatcrrelatedreferencematerials.Thetopicspresentedintheeachofthemainsectionsare:•Section1—INTRODUCTION.Thissectionprovidesasummarydescriptionoftheproject,andtheorganizationoftheSWPPPdocument.•Scction2—SITEDESCRIPTION.Thissectionprovidesadetaileddescriptionoftheexistingsiteconditions,proposedconstructionactivities, StormwaterPollutionPreventionPlanandcalculatedstormwaterflowratesforexistingconditionsandpost—constructionconditions.•Section3—CONSTRUCTIONBMPs.ThissectionprovidesadetaileddescriptionoftheBMPstobeimplementedbasedonthe12requiredelementsoftheSWPPP.•Section4—CONSTRUCTIONPHASINGANDBMPIMPLEMENTATION.ThissectionprovidesadescriptionofthetimingoftheBMPimplementationinrelationtotheprojectschedule.Section5—POLLUTIONPREVENTIONTEAM.Thissectionidentifiestheappropriatecontactnames(emergencyandnon-emergency),monitoringpersonnel,andtheonsitetemporaryerosionandsedimentationcontrolinspector•Section6—INSPECTIONANDMONITORING.Thissectionprovidesadescriptionoftheinspectionandmonitoringrequirementssuchastheparametersofconcerntobemonitored,samplelocations,samplefrequencies,andsamplingmethodsforallstormwaterdischargelocationsfromthesite.Section7—RECORDKEEPING.ThissectiondescribestherequirementsfordocumentationoftheBMPimplementation,siteinspections,monitoringresults,andchangestotheimplementationofcertainBMPsduetositefactorsexperiencedduringconstruction.SupportingdocumentationandstandardformsareprovidedinthefollowingAppendices:AppendixA—SiteplansAppendixB—ConstructionBMPsAppendixC—AlternativeConstructionBMPlistAppendixD—GeneralPermitAppendixE—SiteLogandInspectionFormsAppendixF—EngineeringCalculations2 StormwaterPollutionPreventionPlan2.0SiteDescription2.1ExistingConditionsTheexistingsiteconsistsofasphaltandgravelparkinglotsaswellasopengrassyareas.ThesitewaspreviouslyhometotheShuffletonSteamPlant,whichwasbuiltinthe1930’sanddemolishedin2001.Portionsofthesteamplantinfrastructurearestillinplace,includingalargeundergroundconcretevault,tobedemolishedwiththeconstructionoftheofficeproject.ThesiteissituatedatthesoutherntipofLakeWashingtontothewestoftheGeneCoulonMemorialBeachPark.ThesiteisintheNW¼oftheNW¼ofSection8,Township23Norlh,RangeSEast,WillametteMeridian.Thesitewilloccupyparcel0823059216,withanareaof245,086-SF.Thesiteis5.63acresinsizeandincludesalandscapedareawithassociatedparking.Thetopographyofthesiteandsurroundingpropertiesgentlyslopestothenorthwest.Perthegeotechnicalreport,soildepthandthicknessvariesgreatlythroughoutthesite.Generally,thesiteissiltysandandclayoversilt.Groundwaterliesapproximatelythreetoninefeetbelowexistinggrade,varyingontheelevationoftheadjacentLakeWashington.Runofffromthesitegenerallyinfiltratesorsheetflowsintotheexistingcatchbasinswhichdivertrunofftotheexistingstormnetwork,ultimatelydischargingdirectlytoLakeWashington.Therearenocriticalareasonthesitesuchashigherosionriskareas,wetlands,streams,orsteepslopes(potentiallandslidearea).2.2ProposedConstructionActivitiesOverall,theprojectwillincludea3-towerofficecomplexandgeneralsiteimprovementsincludinglandscapingandaparkinggarage.Theexistingsiteconsistsof1.87acresofimperviousareaand3.48acresofpewiousarea.Theproposedconditionswillconsistofapproximately4.95acresofimperviousareaand0.40acresofperviousarea.AnexistingwewaultwillbeusedtotreatPGISfromthesite,whileanexistingStormFiltercartridgevaultfromtheSouthportHotelprojectwilltreatrunofffromtheremainingPGIS.Newsanitary,waterservice,andstormdrainutilitieswillalsobeconstructed.Constructionactivitieswillincludesitepreparation,TESCinstallation,demolitionoftheexistingvaultonsitc,excavationforthebuildingfoundations,pouredconcretefoundations,concreteconstruction,site-widegrading,andasphaltpaving.ThescheduleandphasingofBMPsduringconstructionisprovidedinSection4.0.StormwaterrunoffvolumeswerecalculatedusingthecomputersoftwareKCRTS.ThetemporarysedimentationwillbeprovidedbyBakertanksthatwillbeusedduringconstructionwasdesignedusingthe2-yearstormevent.Thesearepeakflowsbasedonthedevelopedconditionsthroughoutconstruction.3 StormwaterPollutionPreventionPlanTheBakertankswereallsizedusingBMP251andareintendedforstormwatertreatmentoftotalsuspendedsolidsandstormwaterdetenlion.CalculationsforallpondsinphaseIandasamplecalculationonhowthepondsweresizedareallincludedinAppendixF.Thefollowingsummarizesdetailsregardingsiteareas:•Totalsitearea:5.63acres•Percentimperviousareabeforeconstruction:33%•Percentimperviousareaafterconstruction:88%•Disturbedareaduringconstruction:5.63acres•Disturbedareathatischaracterizedasimpervious(i.e.,accessroads,staging,parking):5.63acresAllstormwaterflowcalculationsareprovidedinAppendixF.4 StormwaterPollutionPreventionPlan3.0ConstructionStormwaterBMPs3.1The12BMPElements3.1.1Element#1—MarkClearingLimitsToprotectadjacentpropertiesandtoreducetheareaofsoilexposedtoconstruction,thelimitsofconstructionwillbeclearlymarkedbeforeland-disturbingactivitiesbegin.Treesthataretobepreserved,asvellasallsensitiveareasandtheirbuffers,shallbeclearlydelineated,bothinthefieldandonthepLans.Ingeneral,naturalvegetationandnativetopsoilshallberetainedinanundisturbedstatetothemaximumextentpossibLe.TheBMPsrelevanttomarkingtheclearinglimitsthatwillbeappliedforthisprojectinclude:HighVisibilityPlasticorMetalFence(BMPC103)AlternateBMPsformarkingclearinglimitsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidcdinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthealternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.3.1.2Element#2—EstablishConstructionAccessConstructionaccessoractivitiesoccurringonunpavedareasshallbeminimized,yetwherenecessary,accesspointsshallbestabilizedtominimizethetrackingofsedimentontopublicroads,andwheelwashing,streetsweeping,andstreetcleaningshallbeemployedtopreventsedimentfromenteringstatewaters.Allwashwastewatershallbecontrolledonsite.ThespecificBMPsrelatedtoestablishingconstructionaccessthatwillbeusedonthisprojectinclude:•StabilizedConstructionEntrance(BMPC105)•WheelWash(BMPC106)•ConstructionRoad/ParkingAreaStabilization(BMPC107)AlternateconstructionaccessBMPsareincludedinAppendixCasaquickreferencetoolfortheonsitcinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthe5 StormwaterPollutionPreventionPlanalternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.3.1.3Element#3—ControlFlowRatesInordertoprotectthepropertiesandwaterwaysdownstreamoftheprojectsite,stormwaterdischargesfromthesitewillbecontrolled.ThespecificBMPsforflowcontrolthatshallbeusedonthisprojectinclude:NoBMPstobeimplementedAlternateflowcontrolBMPsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfy’therequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStonnwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthealternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.TheprojectsiteislocatedwestoftheCascadeMountainCrest.Assuch,theprojectmustcomplywithMinimumRequirement7(Ecology2005).Ingeneral,dischargeratesofstormwaterfromthesitewillbecontrolledwhereincreasesinimperviousareaorsoilcompactionduringconstructioncouldleadtodownstreamerosion,orwherenecessarytomeetlocalagencystormwaterdischargerequirements(e.g.dischargetocombinedsewersystems).3.1.4Element#4—InstallSedimentControlsAllstormwaterrunofffromdisturbedareasshallpassthroughanappropriatesedimentremovalBMPbeforeleavingtheconstructionsiteorpriortobeingdischargedtoaninfiltrationfacility.ThespecificBMPstobeusedforcontrollingsedimentonthisprojectinclude:•DetentionPondOrVault•StormDrainInletProtection(BMPC220)AlternatesedimentcontrolBMPsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthe6 StormwaterPollutionPreventionPlanalternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.Inaddition,sedimentwillberemovedfrompavedareasinandadjacenttoconstructionworkareasmanuallyorusingmechanicalsweepers,asneeded,tominimizetrackingofsedimentsonvehicletiresawayfromthesiteandtominimizewashoffofsedimentsfromadjacentstreetsinrunoff.Wheneverpossible,sedimentladenwatershallbedischargedintoonsite,relativelylevel,vegetatedareas(BMPC240paragraph5,page4-102).Insomecases,sedimentdischargeinconcentratedrunoffcanbecontrolledusingpermanentstormwaterBMPs(e.g.,infiltrationswales.ponds,trenches).SedimentloadscanlimittheeffectivenessofsomepermanentstormwaterBMPs,suchasthoseusedforinfiltrationorbiofiltration;however,thoseBMPsdesignedtoremovesolidsbysettling(wetpondsordetentionponds)canbeusedduringtheconstructionphase.WhenpermanentstormwaterBMPswillbeusedtocontrolsedimentdischargeduringconstruction,thestructurewillbeprotectedfromexcessivesedimentationwithadequateerosionandsedimentcontrolEMPs.AnyaccumulatedsedimentshallberemovedafterconstructioniscompleteandthepermanentstormwaterBMPwillberestabilizedwithvegetationperapplicabledesignrequirementsoncetheremainderoftheThefollowingBMPswillbeimplementedasend-of-pipesedimentcontrolsasrequiredtomeetpermittedturbiditylimitsinthesitedischarge(s).Priortotheimplementationofthesetechnologies,sedimentsourcesanderosioncontrolandsoilstabilizationRMPeffortswillbemaximizedtoreducetheneedforend-of-pipesedimentationcontrols.•TemporarySedimentPond(BMPC241)1ConstructionStormwaterFiltration(BMPC251)•ConstructionStormwaterChemicalTreatment(BMPC250)(implementedonlywithpriorwrittenapprovalfromEcology).3.1.5Element#5—StabilizeSoilsExposedandunworkedsoilsshallbestabilizedwiththeapplicationofeffectiveBMPstopreventerosionthroughoutthelifeoftheproject.ThespecificBMPsforsoilstabilizationthatshallbeusedonthisprojectinclude:•TemporaryandPermanentSeeding(BMPC120)AlternatesoilstahilizationBMPsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriate7 StormwaterPollutionPreventionPlanduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthealternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.TheprojectsiteislocatedvestoftheCascadeMountainCrest.Assuch,nosoilsshallremainexposedandunworkedformorethan7daysduringthedryseason(May1toSeptember30)and2daysduringthewetseason(OctoberItoApril30).Regardlessofthetimeofyear,allsoilsshallbestabilizedattheendoftheshiftbeforeaholidayorweekendifneededbasedonweatherforecasts.Ingeneral,cutandfillslopeswillbestabilizedassoonaspossibleandsoilstockpileswillbetemporarilycoveredwithplasticsheeting.Allstockpiledsoilsshallbestabilizedfromerosion,protectedwithsedimenttrappingmeasures,andwherepossible,belocatedawayfromstormdraininlets,waterways,anddrainagechannels.3.1.6Element#6—ProtectSlopesAllcutandfillslopeswillbedesigned,constructed,andprotectedinamannerthanminimizeserosion.ThefollowingspecificBMPswillbeusedtoprotectslopesforthisproject:TemporaryandPermanentSeeding(BMPC120)AlternateslopeprotectionBMPsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthealternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.3.1.7Element#7—ProtectDrainInletsAllstormdraininletsandculvertsmadeoperableduringconstructionshallbeprotectedtopreventunfilteredoruntreatedwaterfromenteringthedrainageconveyancesystem.However,thefirstpriorityistokeepallaccessroadscleanofsedimentandkeepstreetwashwaterseparatefromenteringstormdrainsuntiltreatmentcanbeprovided.StormDrainInletProtection(BMPC220)willbeimplementedforalldrainageinletsandculvertsthatcouldpotentiallybeimpactedbysediment-ladenrunoffonandneartheprojectsite.Thefollowinginletprotectionmeasureswillbeappliedonthisproject:8 StormwaterPollutionPreventionPlanDropInletProtection•CatchBasinFiltersIftheBMPoptionslistedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD),orifnoBMPsarelistedabovebutdeemednecessaryduringconstruction,theCertifiedErosionandSedimentControlLeadshallimplementoneormoreofthealternativeBMPinletprotectionoptionslistedinAppendixC.3.1.8Element#8—StabilizeChannelsandOutletsWheresiterunoffistobeconveyedinchannels,ordischargedtoastreamorsomeothernaturaldrainagepoint,effortswillbetakentopreventdownstreamerosion.ThespecificBMPsforchannelandoutletstabilizationthatshallbeusedonthisprojectinclude:NoBMPstobeimplementedAlternatechannelandoutletstabilizationBMPsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthealternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.TheprojectsiteislocatedwestoftheCascadeMountainCrest.Assuch,alltemporaryon-siteconveyancechannelsshallbedesigned,constructed,andstabilizedtopreventerosionfromtheexpectedpeak10minutevelocityofflowfromaTypeIA,10-year,24-hourrecurrenceintervalstormforthedevelopedcondition.Alternatively,the10-year,I-hourpeakflowrateindicatedbyanapprovedcontinuousrunoffsimulationmodel,increasedbyafactorof1.6,shallbeused.Stabilization,includingarmoringmaterial,adequatetopreventerosionofoutlets,adjacentstreambanks,slopes,anddownstreamreachesshallbeprovidedattheoutletsofallconveyancesystems.3.1.9Element#9—ControlPollutantsAllpollutants,includingwastematerialsanddemolitiondebris,thatoccuronsitcshallbehandledanddisposedofinamannerthatdoesnotcausecontaminationofstormwater.Goodhousekeepingandpreventativemeasureswillbetakentoensurethatthesitewillbekeptclean,wellorganized,andfreeofdebris.Ifrequired,BMPstobeimplementedtocontrolspecificsourcesofpollutantsarediscussedbelow..9 StormwaterPollutionPreventionPlanVehicles,constructionequipment,and/orpetroleumproductstorage/dispensing:Allvehicles,equipment,andpetroleumproductstorage/dispensingareaswillbeinspectedregularlytodetectanyleaksorspills,andtoidentifymaintenanceneedstopreventleaksorspills.•On-sitefuelingtanksandpetroleumproductstoragecontainersshallincludesecondarycontainment.•Spillpreventionmeasures,suchasdrippans,willbeusedwhenconductingmaintenanceandrepairofvehiclesorequipment.•Inordertoperformemergencyrepairsonsite,temporaryplasticwillbeplacedbeneathand,ifraining,overthevehicle.•Contaminatedsurfacesshallbecleanedimmediatelyfollowinganydischargeorspillincident.Demolition:•Dustreleasedfromdemolishedsidewalks,buildings,orstructureswillbecontrolledusingDustControlmeasures(BMPC140).•Stormdraininletsvulnerabletostormwaterdischargecarryingdust,soil,ordebriswillbeprotectedusingStormDrainInletProtection(EMPC220asdescribedaboveforElement7).•ProcesswaterandslurryresultingfromsawcuttingandsurfacingoperationswillbepreventedfromenteringthewatersoftheStatebyimplementingSawcuttingandSurfacingPollutionPreventionmeasures(BMPC152).Concreteandgrout:•ProcesswaterandslurryresultingfromconcreteworkwillbepreventedfromenteringthewatersoftheStatebyimplementingConcreteHandlingmeasures(BMPC151).Sanitarywastewater:•Portablesanitationfacilitieswillbefirmlysecured,regularlymaintained,andemptiedwhenneccssary.Jo StormwaterPollutionPreventionPlan•Wheelwashortirebathwastewatershallbedischargedtoaseparateon-sitetreatmentsystemortothesanitaryseweraspartofWheelWashimplementation(BMPC106).SolidWaste:•Solidwastewillbestoredinsecure,clearlymarkedcontainers.ThefacilitydoesnotrequireaSpillPrevention,Control,andCountermeasure(SPCC)PlanundertheFederalregulationsoftheCleanWaterAct(CWA).3.1.10Element#10—ControlDcwateringExtensivedewateñngisoccuringwiththisproject.Dewateringispumpedtosettlementtankstocontrolsedimentifneeded,otherwisedewateringwellsdischargingcleangroundwaterisdischargedthroughundergroundconveyancesystemstoanexistingdischargelocationtoLakeWashington.3.1.11Element#11—MaintainBMPsAlltemporaryandpermanenterosionandsedimentcontrolBMPsshallbemaintaincdandrepairedasneededtoassurecontinuedperformanceoftheirintendedfhnction.MaintenanceandrepairshallbeconductedinaccordancewitheachparticularBMPsspecifications(attached).VisualmonitoringoftheBMPswillbeconductedatleastonceeverycalendarweekandwithin24hoursofanystormwaterornon-stormwaterdischargefromthesite.Ifthesitebecomesinactive,andistemporarilystabilized,theinspectionfrequencywillbereducedtoonceeverymonth.AlltemporaryerosionandsedimentcontrolBMPsshallberemovedwithin30daysafterthefinalsitestabilizationisachievedorafterthetemporaryBMPsarenolongerneeded.Trappedsedimentshallberemovedorstabilizedonsite.DisturbedsoilresultingfromremovalofBMPsorvegetationshallbepermanentlystabilized.3.1.12Element#12—ManagetheProjectErosionandsedimentcontrolBMPsforthisprojecthavebeendesignedbasedonthefollowingprinciples:•Designtheprojecttofittheexistingtopography,soils,anddrainagepatterns.•Emphasizeerosioncontrolratherthansedimentcontrol.1Minimizetheextentanddurationoftheareaexposed.•Keeprunoffvelocitieslow.II StormwaterPollutionPreventionPlan•Retainsedimentonsite.•ThoroughlymonitorsiteandmaintainallESCmeasures.Schedulemajorearthworkduringthedryseason.Inaddition,projectmanagementwillincorporatethekeycomponentslistedbelow:AsthisprojectsiteislocatedwestoftheCascadeMountainCrest,theprojectvillbemanagedaccordingtothefollowingkeyprojectcomponents:PhasingofConstruction•Theconstructionprojectisbeingphasedtotheextentpracticableinordertopreventsoilerosion,and,tothemaximumextentpossible,thetransportofsedimentfromthesiteduringconstruction.•Revegetationofexposedareasandmaintenanceofthatvegetationshallbeanintegralpartoftheclearingactivitiesduringeachphaseofconstruction,pertheSchedulingBMP(C162).SeasonalWorkLimitations•FromOctober1throughApril30,clearing,grading,andothersoildisturbingactivitiesshallonlybepermittedifshowntothesatisfactionofthelocalpermittingauthoritythatsilt-ladenrunoffwillbepreventedfromleavingthesitethroughacombinationofthefollowing:ciSiteconditionsincludingexistingvegetativecoverage,slope,soiltype,andproximitytoreceivingwaters;andciLimitationsonactivitiesandtheextentofdisturbedareas;andciProposederosionandsedimentcontrolmeasures.•Basedontheinformationprovidedand/orlocaiweatherconditions,thelocalpermittingauthoritymayexpandorrestricttheseasonallimitationonsitedisturbance.•Thefollowingactivitiesarcexemptfromtheseasonalclearingandgradinglimitations:ciRoutinemaintenanceandnecessaryrepairoferosionandsedimentcontrolBMPs;12 StormwaterPollutionPreventionPlanCRoutinemaintenanceofpublicfacilitiesorexistingutilitystructuresthatdonotexposethesoilorresultintheremovalofthevegetativecovertosoil;andCActivitieswherethereis100percentinfiltrationofsurfacewaterrunoffwithinthesiteinapprovedandinstallederosionandsedimentcontrolfacilities.CoordinationwithUtilitiesandOtherJurisdictions•Carehasbeentakentocoordinatewithutilities,otherconstructionprojects,andthelocaljurisdictioninpreparingthisSWPPPandschedulingtheconstructionwork.InspectionandMonitoringAllBMPsshallbeinspected,maintained,andrepairedasneededtoassurecontinuedperformanceoftheirintendedfunction.Siteinspectionsshallbeconductedbyapersonwhoisknowledgeableintheprinciplesandpracticesoferosionandsedimentcontrol.Thispersonhasthenecessaryskillsto:CAssessthesiteconditionsandconstructionactivitiesthatcouldimpactthequalityofstormwater,andAssesstheeffectivenessoferosionandsedimentcontrolmeasuresusedtocontrolthequalityofstormwaterdischarges.•ACertifiedErosionandSedimentControlLeadshallbeon-siteoron-callatalltimes.•Wheneverinspectionand/ormonitoringrevealsthattheBMPsidentifiedinthisSWPPPareinadequate,duetotheactualdischargeoforpotentialtodischargeasignificantamountofanypollutant,appropriateBMPsordesignchangesshallbeimplementedassoonaspossible.MaintaininganUpdatedConstructionSWPPP•ThisSWPPPshallberetainedon-siteorwithinreasonableaccesstothesite.•TheSWPPPshillbemodifiedwheneverthereisachangeinthedesign,construction,operation,ormaintenanceattheconstructionsitethathas,orcouldhave,asignificanteffectonthedischargeofpollutantstowatersofthestate.13 StormwaterPollutionPreventionPlanTheSWPPPshallbemodifiedif,duringinspectionsorinvestigationsconductedbytheowner/operator,ortheapplicablelocalorstateregulatoryauthority,itisdeterminedthattheSWPPPisineffectiveineliminatingorsignificantlyminimizingpollutantsinstormwaterdischargesfromthesite.TheSWPPPshallbemodifiedasnecessarytoincludeadditionalormodifiedBMPsdesignedtocorrectproblemsidentified.RevisionstotheSWPPPshallbecompletedwithinseven(7)daysfollowingtheinspection.AlternatedewateringcontrolBMPsareincludedinAppendixCasaquickreferencetoolfortheonsiteinspectorintheeventtheBMP(s)listedabovearedeemedineffectiveorinappropriateduringconstructiontosatisfytherequirementssetforthintheGeneralNPDESPermit(AppendixD).Toavoidpotentialerosionandsedimentcontrolissuesthatmaycauseaviolation(s)oftheNPDESConstructionStormwaterpermit(asprovidedinAppendixD),theCertifiedErosionandSedimentControlLeadwillpromptlyinitiatetheimplementationofoneormoreofthealternativeBMPslistedinAppendixCafterthefirstsignthatexistingBMPsareineffectiveorfailing.14 StormwaterPollutionPreventionPlan4.0ConstructionPhasingandBMPImplementationTheBMPimplementationschedulewillbedrivenbytheconstructionschedule.ThefollowingprovidesasequentiallistoftheproposedconstructionschedulemilestonesandthecorrespondingBMPimplementationschedule.Thelistcontainskeymilestonessuchaswetseasonconstruction.TheBMPimplementationschedulelistedbelowiskeyedtoproposedphasesoftheconstructionproject,andreflectsdifferencesinBMPinstallationsandinspectionsthatrelatetowetseasonconstruction.TheprojectsiteislocatedwestoftheCascadeMountainCrest.Assuch,thedryseasonisconsideredtobefromMay1toSeptember30andthewetseasonisconsideredtobefromOctober1toApril30.•EstimateofConstructionstartdate:TBD•EstimateofConstructionfinishdate:TBD•Mobilizeequipmentonsite:TBD•MobilizeandstoreallESCandsoilstabilizationproducts(storematerialsonhandBMPC150):TBD•InstallESCmeasures:TBD•Installstabilizedconstructionentrance:TBD•Beginclearingandgrubbing:TBD•Demolishexistingone-storybuildingstructure:TBD•ExcavationforbuildingfoundationsTBD•Soilstabilizationonexcavatedsideslopes(inidle,noworkareasasshownonESCplans)TBD1Temporaryerosioncontrolmeasures(hydroseeding)TBD•Siteinspectionsreducedtomonthly:TBD•BeginconcretepourandimplementBMPC151:TBD•Excavateandinstallnewutilitiesandservices(PhaseI):TBD•Beginbuildingconstruction:TBD15 StormwaterPollutionPreventionPlan•CompletePhase1utilityconstructionTBDBeginimplementingsoilstabilizationandsedimentcontrolBMPsthroughoutthesiteinpreparationforwetseason:TBD•WetSeasonstarts:10/01/2015•SiteinspectionsandmonitoringconductedweeklyandforapplicableraineventsasdetailedinSection6ofthisSWPPP:TBD•ImplementElement#12BMPsandmanagesitetominimizesoildisturbanceduringthewetseasonTBD•Nositeworksuchasgradingorexcavationplanned:DrySeasonstarts:05/01/2016•Sitegradingbegins:TBD•Excavateandinstallnewutilitiesandservices(Phase2):TBDSitegradingends:TBDIBuildingconstmctioncomplete:TBD•Finallandscapingandplantingbegins:TBD•Permanenterosioncontrolmeasures(hydroseeding):TBD16 StormwaterPollutionPreventionPlan5.0PollutionPreventionTeam5.1RolesandResponsibilitiesThepollutionpreventionteamconsistsofpersonnelresponsibleforimplementationoftheSWPPP,includingthefollowing:•CertifiedErosionandSedimentControlLead(CESCL)—primarycontractorcontact,responsibleforsiteinspections(BMPs,visualmonitoring,sampling,etc.);tobecalleduponincaseoffailureofanyESCmeasures.•ResidentEngineer—Forprojectswithengineeredstructuresonly(sedimentponds/traps,sandfilters,etc.):siterepresentativefortheownerthatistheproject’ssupervisingengineerresponsibleforinspectionsandissuinginstructionsanddrawingstothecontractor’ssitesupervisororrepresentative•EmergencyEcologyContact—individualtobecontactedatEcologyincaseofemergency..•EmergencyOwnerContact—individualthatisthesiteownerorrcpresentativeofthesiteownertobecontactedinthecaseofanemergency.•Non-EmergencyEcologyContact—individualthatisthesiteownerorrepresentativeofthesiteownerthancanbecontactedifrequired.•MonitoringPersonnel—personnelresponsibleforconductingwaterqualitymonitoring;formostsitesthispersonisalsotheCertifiedErosionandSedimentControlLead.5.2TeamMembersNamesandcontactinformationforthoseidentifiedasmembersofthepollutionpreventionteamareprovidedinthefollowingtable.TitleName(s)PhoneNumbercertifiedErosionandSedimentControlLead(CESCL)TBDTBDResidentEngineerTBDTEDEmergencyEcologyContactTEDTBDEmergencyOwnerContactTEDTED.17 StormwaterPollutionPreventionPlanNon-EmergencyEcologyContactTBDTBDfMonitorinuPersonnelTBDTRD18r StormwaterPollutionPreventionPlan6.0SiteInspectionsandMonitoringMonitoringincludesvisualinspection,monitoringforwaterqualityparametersofconcern,anddocumentationoftheinspectionandmonitoringfindingsinasitelogbook.Asitelogbookwillbemaintainedforallon-siteconstructionactivitiesandwillinclude:•ArecordoftheimplementationoftheSWPPPandotherpermitrequirements;•Siteinspections;and,•Stormwaterqualitymonitoring.Forconvenience,theinspectionformandwaterqualitymonitoringformsincludedinthisSWPPPincludetherequiredinformationforthesitelogbook.ThisSWPPPmayfunctionasthesitelogbookifdesired,ortheformsmaybeseparatedandincludedinaseparatesitelogbook.However,ifseparated,thesitelogbookbutmustbemaintainedon-siteorwithinreasonableaccesstothesiteandbemadeavailableuponrequesttoEcologyorthelocaljurisdiction.6.1SiteInspectionAllBMPswillbeinspected,maintained,andrepairedasneededtoassurecontinuedperformanceoftheirintendedfunction.TheinspectorwillbeaCertifiedErosionandSedimentControlLead(CESCL)perBMPC160.ThenameandcontactinformationfortheCESCLisprovidedinSection5ofthisSWPPP.Siteinspectionwilloccurinallareasdisturbedbyconstructionactivitiesandatallstormwaterdischargepoints.Stormwaterwillbeexaminedforthepresenceofsuspendedsediment,turbidity,discoloration,andoilysheen.ThesiteinspectorwillevaluateanddocumenttheeffectivenessoftheinstalledBMPsanddetermineifitisnecessarytorepairorreplaceanyoftheBMPstoimprovethequalityofstormwaterdischarges.Allmaintenanceandrepairswillbedocumentedinthesitelogbookorformsprovidedinthisdocument.AllnewBMPsordesignchangeswillbedocumentedintheSWPPPassoonaspossible.6.1.1SiteInspectionFrequencySitcinspectionswillbcconductedatleastonceaweekandwithin24hoursfollowinganydischargefromthesite.Forsiteswithtemporarystabilizationmeasures,thesiteinspectionfrequencycanbereducedtoonceeverymonth.6.1.2SiteInspectionDocumentationThcsiteinspectorwillrecordeachsiteinspectionusingthesiteloginspectionformsprovidedinAppendixE.ThesiteinspectionlogformsmaybeseparatedfromthisSWPPPdocument,but19 StormwaterPollutionPreventionPlanwillbemaintainedon-siteorwithinreasonableaccesstothesiteandbemadeavailableuponrequesttoEcologyorthelocaljurisdiction.6.2StormwatcrQualityMonitoringMonitoringrequirementsfortheproposedprojectwillincludeeitherturbidityorwatertransparencysamplingtomonitorsitedischargesforwaterqualitycompliancewiththe2005ConstructionStormwaterGeneralPermit(AppendixD).Samplingwillbeconductedatalldischargepointsatleastoncepercalendarweek.TurbidityortransparencymonitoringwillfollowtheanalyticalmethodologiesdescribedinSectionS4ofthe2005ConstructionStormwaterGeneralPermit(AppendixD).Thekeybenchmarkturbidityvalueis25nephelometricturbidityunits(NTU)forthedownstreamreceivingwaterbody.Ifthe25NTUbenchmarkisexceededinanysamplecollectedfromCBS,thefollowingstepswillbeconducted:1.EnsureallBMPsspecifiedinthisSWPPPareinstalledandthnctioningasintended.2.AssesswhetheradditionalBMPsshouldbeimplemented,anddocumentmodifiedBMPsintheSWPPPasnecessary.3.Sampledischargedailyuntilthedischargeis25NTUorlower.Iftheturbidityexceeds250NTUatanytime,thefollowingstepswillbeconducted:1.NotifyEcologybyphonewithin24hoursofanalysis(seeSection5.0ofthisSWPPPforcontactinformation).2.Continuesamplingdailyuntilthedischargeis25NTUorlowerInitiateadditionaltreatmentBMPssuchasoff-sitetreatment,infiltration,filtrationandchemicaltreatmentwithin24hours,andimplementthoseadditionaltreatmentBMPsassoonaspossible,butwithinaminimumof7days.3.DescribeinspectionresultsandremedialactionstakeninthesitelogbookandinmonthlydischargemonitoringreportsasdescribedinSection7.0ofthisSWPPP.6.2.2pHSamplingStormwaterrunoffwillbemonitoredforpHstartingonthefirstdayofanyactivitythatincludesmorethan40yardsofpouredorrecycledconcrete,oraftertheapplicationof“EngineeredSoils”suchas,Portlandcementtreatedbase,cementkilndust,orflyash,Thisdoesnotincludefertilizers.Forconcretework,pHmonitoringwillstartthefirstdayconcreteispouredand20 StormwaterPollutionPreventionPlancontinueuntil3weeksafterthelastpour.Forengineeredsoils,thep14monitoringperiodbeginswhenengineeredsoilsarefirstexposedtoprecipitationandcontinueuntiltheareaisfullystabilized.Stormwatersampleswillbecollectedweeklyfromallpointsofdischargefromthesiteandmeasuredforp1-IusingacalibratedpHmeter,pHtestkit,orwiderangepHindicatorpaper.IfthemeasuredpHis8.5orgreater,thefollowingstepswillbeconducted:1.PreventthehighpHwaterfromenteringstormdrainsorsurfacewater.2.AdjustorneutralizethehighpHvaterifnecessaryusingappropriatetechnologysuchasCO2sparging(liquidordryice).3.ContactEcologyifchemicaltreatmentotherthanCO2spargingisplanned...21 StormwaterPollutionPreventionPlan7.0ReportingandRecordkeeping7.1Recorilkeeping7.1.1SiteLogBookAsitelogbookwillbemaintainedforallon-siteconstructionactivitiesandwillinclude:ArecordoftheimplementationoftheSWPPPandotherpermitrequirements;•Siteinspections;and,•Stormwaterqualitymonitoring.Forconvenience,theinspectionformandwaterqualitymonitoringformsincludedinthisSWPPPincludetherequiredinformationforthesitelogbook.7.1.2RecordsRetentionRecordsofallmonitoringinformation(sitelogbook,inspectionreports/checklists,etc.),thisStormwaterPollutionPreventionPlan,andanyotherdocumentationofcompliancewithpermitrequirementswillberetainedduringthelifeoftheconstructionprojectandforaminimumofthreeyearsfollowingtheterminationofpermitcoverageinaccordancewithpermitcondition55.C.7.1.3AccesstoPlansandRecordsTheSWPPP,GeneralPermit,NoticeofAuthorizationletter,andSiteLogBookwillberetainedonsiteorwithinreasonableaccesstothesiteandwillbemadeimmediatelyavailableuponrequesttoEcologyorthelocaljurisdiction.AcopyofthisSWPPPwillbeprovidedtoEcologywithin14daysofreceiptofawrittenrequestfortheSWPPPfromEcology.AnyotherinformationrequestedbyEcologywillbesubmittedwithinareasonabletime.AcopyoftheSWPPPoraccesstotheSWPPPwillbeprovidedtothepublicwhenrequestedinwritinginaccordancewithpermitconditionS5.G.7.1.4UpdatingtheSWPPPInaccordancewithConditionsS3,54.B,and59.13.3oftheGeneralPermit,thisSWPPPwillbemodifiediftheSWPPPisineffectiveineliminatingorsignificantlyminimizingpollutantsinstormwaterdischargesfromthesiteortherehasbeenachangeindesign,construction,operation,ormaintenanceatthesitethathasasignificanteffectonthedischarge,orpotentialfordischarge,ofpollutantstothewatersoftheState.TheSWPPPwillbemodifiedwithinsevendaysofdeterminationbasedoninspection(s)thatadditionalormodifiedBMPsarenecessarytocorrectproblemsidentified,andanupdatedtimelineforBMPimplementationwillbeprepared.23 StormwaterPollutionPreventionPlan7.2Reporting7.2.1DischargeMonitoringReportsIfcumulativesoildisturbanceis5acresorlarger:DischargeMonitoringReports(DMRs)willbesubmittedtoEcologymonthly.Oftherewasnodischargeduringagivenmonitoringperiod,thePennitteeshallsubmittheformasrequired,withthewords“Nodischarge”enteredintheplaceofmonitoringresults.TheDMRduedateis15daysfollowingtheendofeachmonth.7.2.2NotificationofNoncomplianceIfanyofthetermsandconditionsofthcpermitarcnotmet,anditcausesathreattohumanhealthortheenvironment,thefollowingstepswillbetakeninaccordancewithpermitsectionS5.F:1.Ecologywillbeimmediatelynotifiedofthefailuretocomply.2.Immediateactionwillbetakentocontrolthenoncomplianceissueandtocorrecttheproblem.Ifapplicable,samplingandanalysisofanynoncompliancewillberepeatedimmediatelyandtheresultssubmittedtoEcologywithinfive(5)daysofbecomingawareoftheviolation.3.AdetailedwrittenreportdescribingthenoncompliancewillbesubmittedtoEcologywithinfive(5)days,unlessrequestedearlierbyEcology.7.2.3PermitApplicationandChangesInaccordancewithpermitconditionS2.A,acompleteapplicationformwillbesubmittedtoEcologyandtheappropriatelocaljurisdiction(ifapplicable)tobecoveredbytheGeneralPermit.a024 StormwaterPollutionPreventionPlanAppendixA—SitePlans25F ProjectSouthportOfficeDesignedBy:CJBDate:ClientZGF801SECONDAVENUE,SUITE900SEATTLEWA98104ft206/343-0460F:2061343-5691S-itg.-COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGNTSProjectNo:C140l94-l2SiteLocatioçCheckedBrBSBSheetwww.cplinc.com SOUTHPORTHOTELPROJECT(UNDERSEPARATEPERMIT)COUGHLINPORTERLUNDEENSTRUCTURAL-CIVILSEISMICENGINEERINGEXISTINGGRAVELLOT‘HROADTOBECONSTRUCTEDWITHSOUTHPORTHOTELProjectSouthportOfficeDesignedBy:CJBClientZGFSalSECONDAVENUE.SUITE900SEATTLEWA98104P:2061343-0460-F:206/343-5691www.cpIinc.com[IProjectNo:C140194-12CheckedBy:BSBDate:Sheet F-ProposedCondition!ProjectSouthportOfficeDesignedBy:CJBDate:ProjectNo:C140194-l2ClientZGF801SECONDAVENUE,SUITE900SEATTLEWA98104P206/343-0460-E20/343-569ICheckedBy:BSBSheerwww.cplinc.comp-COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGSOUTHPORTHOTELPROJECT(UNDERSEPARATEPERMIT)EXWATERQUALITYVAULTNEWPGISROUTEDTOEXWATERQUALITYVAULTtIEXPGISROUTEDTOEXSTORMFILTERCARTRIDGESSOUTHPORTOFFICEiiCLEANRUNOFFTONEWPGISROUTEDINTERALLYTODCWATERQUALITYVAULTDISCHARGETODC.STORMSEWERIE/H—-—ip---_____---e:rrrcç-NTS)Figure3L StormwaterPollutionPreventionPlanAppendixB—ConstructionBMPs264 BMPC103:HighVisibilityFencePurposeFencingisintendedto:1.Restrictclearingtoapprovedlimits.2.Preventdisturbanceofsensitiveareas,theirbuffers,andotherareasrequiredtobeleftundisturbed.3.Limitconstructiontraffictodesignatedconstructionentrances,exits,orinternalroads.4.Protectareaswheremarkingwithsurveytapemaynotprovideadequateprotection.ConditionsofUseToestablishclearinglimitsplastic,fabric,ormetalfencemaybeused:•Attheboundaryofsensitiveareas,theirbuffers,andotherareasrequiredtobeleftuncleared.•Asnecessarytocontrolvehicleaccesstoandonthesite.DesignandHighvisibilityplasticfenceshallbecomposedofahigh-densityInstallationpolyethylenematerialandshallbeatleastfourfeetinheight.PostsforSpecificationsthefencingshallbesteelorwoodandplacedevery6feetoncenter(maximum)orasneededtoensurerigidity.Thefencingshallbefastenedtotheposteverysixincheswithapolyethylenetie.Onlongcontinuouslengthsoffencing,atensionwireorropeshallbeusedasatopstringertopreventsaggingbetweenposts.Thefencecolorshallbehighvisibilityorange.Thefencetensilestrengthshallbe360lbs,/ft.usingtheASTMD4595testingmethod.IfappropriateinstallfabricsiltfenceinaccordancewithBMPC233toactashighvisibilityfence.Siltfenceshallbeatleast3feethighandmustbehighlyvisibletomeettherequirementsofthisBMP.Metalfencesshallbedesignedandinstalledaccordingtothemanufacturer’sspecifications.Metalfencesshallbeatleast3feethighandmustbehighlyvisible.Fencesshallnotbewiredorstapledtotrees.1fainteganceIfthefencehasbeendamagedorvisibilityreduced,itshallberepairedorStandardsreplacedimmediatelyandvisibilityrestored.Volume11—ConstructionStormwaterPollutionPrevention—August20124-6 BMPC105:StabilizedConstructionEntrance!ExitPurposeStabilizedConstructionentrancesareestablishedtoreducetheamountofsedimenttransportedontopavedroadsbyvehiclesorequipment.Thisisdonebyconstructingastabilizedpadofquarryspallsatentrancesandexitsforconstructionsites.(‘onditionsofUseConstructionentrancesshallbestabilizedwherevertrafficwillbeenteringorleavingaconstructionsiteifpavedroadsorotherpavedareasarewithin1,000feetofthesite.Forresidentialconstructionprovidestabilizedconstructionentrancesforeachresidence,ratherthanonlyatthemainsubdivisionentrance.Stabilizedsurfacesshallbeofsufficientlength/widthtoprovidevehicleaccess/parking,basedonlotsize/configuration.Onlargecommercial,highway,androadprojects,thedesignershouldincludeenoughextramaterialsinthecontracttoallowforadditionalstabilizedentrancesnotshownintheinitialConstructionSWPPP.Itisdifficulttodetermineexactlywhereaccesstotheseprojectswilltakeplace;additionalmaterialswillenablethecontractortoinstallthemwhereneeded.DesignandSeeFigure4.1.1fordetails.Note:the100’minimumlengthoftheInstallationentranceshallbereducedtothemaximumpracticablesizewhenthesizeSpecificationsorconfigurationofthesitedoesnotallowthefulllength(100’).Constructstabilizedconstructionentranceswitha12-inchthickpadof4-inchto8-inchquarryspalls,a4-inchcourseofasphalttreatedbase(ATB),oruseexistingpavement.Donotusecrushedconcrete,cement,orcalciumchlorideforconstructionentrancestabilizationbecausetheseproductsraisepHlevelsinstormwaterandconcretedischargetosurfacewatersoftheStateisprohibited.Aseparationgeotextileshallbeplacedunderthespallstopreventfinesedimentfrompumpingupintotherockpad.Thegeotextileshallmeetthefollowingstandards:GrabTensileStrength(ASTMD4751)200psimitt.GrabTensileElongation(ASTM30%max.D4632)MullenBurstStrength(ASTM400psimm.D3786-80a)AOS(ASTMD475l)20-45(U.S.standardsievesize)•Considerearlyinstallationofthefirstliftofasphaltinareasthatwillpaved;thiscanbeusedasastabilizedentrance.Alsoconsidertheinstallationofexcessconcreteasastabilizedentrance.Duringlargeconcretepours,excessconcreteisoftenavailableforthispurpose.VolumeII—ConstructionStormwaterPollutionPrevention—August20124-7‘.áaaws**—aa- •Fencing(seeBMPC103)shallbeinstalledasnecessarytorestricttraffictotheconstructionentrance.•Wheneverpossible,theentranceshallbeconstructedonafirm,compactedsubgrade.Thiscansubstantiallyincreasetheeffectivenessofthepadandreducetheneedformaintenance.•Constructionentrancesshouldavoidcrossingexistingsidewalksandbackofwalkdrainsifatallpossible.Tfaconstructionentrancemustcrossasidewalkorbackofwalkdrain,thefulllengthofthesidewalkandbackofwalkdrainmustbecoveredandprotectedfromsedimentleavingthesite.MaintenanceQuarryspallsshallbeaddedifthepadisnolongerinaccordancewithStandardsthespecifications.•Iftheentranceisnotpreventingsedimentfrombeingtrackedontopavement,thenalternativemeasurestokeepthestreetsfreeofsedimentshallbeused.Thismayincludereplacement/cleaningoftheexistingquarryspalls,streetsweeping,anincreaseinthedimensionsoftheentrance,ortheinstallationofawheelwash.•Anysedimentthatistrackedontopavementshallberemovedbyshovelingorstreetsweeping.Thesedimentcollectedbysweepingshallberemovedorstabilizedonsite.Thepavementshallnotbecleanedbywashingdownthestreet,exceptwhenhighefficiencysweepingisineffectiveandthereisathreattopublicsafety.Ifitisnecessarytowashthestreets,theconstructionofasmallsumptocontainthewashwatershallbeconsidered.Thesedimentwouldthenbewashedintothesumpwhereitcanbecontrolled.•Performstreetsweepingbyhandorwithahighefficiencysweeper.Donotuseanon-highefficiencymechanicalsweeperbecausethiscreatesdustandthrowssoilsintostormsystemsorconveyanceditches.•Anyquarryspallsthatareloosenedfromthepad,whichendupontheroadwayshallberemovedimmediately.•Ifvehiclesareenteringorexitingthesiteatpointsotherthantheconstructionentrance(s),fencing(seeBMPC103)shallbeinstalledtocontroltraffic.•Uponprojectcompletionandsitestabilization,allconstructionaccessesintendedaspermanentaccessformaintenanceshallbepermanentlystabilized..VolumeII—ConstructionStornwaterPollutionPrevention—August20124-8. Figure4.1.1—StabilizedConstructionEntranceApprovedasEquivalentEcologyhasapprovedproductsasabletomeettherequirementsofBMPC105.TheproductsdidnotpassthroughtheTechnologyAssessmentProtocol—Ecology(TAPE)process.Localjurisdictionsmaychoosenottoacceptthisproductapprovedasequivalent,ormayrequireadditionaltestingpriortoconsiderationforlocaluse.TheproductsareavailableforreviewonEcology’swebsiteathttp://www.ecy.wa.gov/programs/wg/stormwater/newtech/eguivalent.htmlBMPC106:WheelWashPurposeConditionsofUseWheelwashesreducetheamountofsedimenttransportedontopavedroadsbymotorvehicles.Whenastabilizedconstructionentrance(seeBMPC105)isnotpreventingsedimentfrombeingtrackedontopavement.WheelwashingisgenerallyaneffectiveBMPwheninstalledwithcarefulattentiontotopography.Forexample,awheelwashcanbedetrimentalifinstalledatthetopofaslopeabuttingaright-of-waywherethewaterfromthedrippingtruckcanrununimpededintothestreet.Vohune1!—ConstructionStonnwaterPollutionPrevention—August2012DrivewayshallmeettherequirementsofthepermittingagencyItisrecommendedthattheenhanceDeJoMiednotrialrrcffdrnselfthepadInstalldnvewayculvertthereisaroadsideditchpresent4—8auarwsoatisGeotextite12mm.thicknessVProvidefu.twidthatinqres&eqessarea4-9 •Pressurewashingcombinedwithanadequatelysizedandsurfacedpadwithdirectdrainagetoalarge10-footx10-footsumpcanbeveryeffective.•Dischargewheelwashortirebathwastewatertoaseparateon-sitetreatmentsystemthatpreventsdischargetosurfacewater,suchasclosed-looprecirculationoruplandlandapplication,ortothesanitarysewerwithlocalsewerdistrictapproval.•Wheelwashortirebathwastewatershouldnotincludewastewaterfromconcretewashoutareas.DesignandSuggesteddetailsareshowninFigure4.1.2.TheLocalPermittingInstallationAuthoritymayallowotherdesigns.Aminimumof6inchesofasphaltSpecificationstreatedbase(ATB)overcrushedbasematerialorBinchesoveragoodsubgradeisrecommendedtopavethewheelwash.Usealowclearancetrucktotestthewheelwashbeforepaving.Eitherabellydumporlowboywillworkwelltotestclearance.Keepthewaterlevelfrom12to14inchesdeeptoavoiddamagetotruckhubsandfillingthetrucktongueswithwater.Midpointspraynozzlesarconlyneededinextremelymuddyconditions.Wheelwashsystemsshouldbedesignedwithasmallgradechange.6-to1-inchesfora10-foot-widepond,toallowsedimenttoflowtothelowsideofpondtohelppreventre-suspensionofsediment.Adrainpipewitha2-to3-footrisershouldbeinstalledonthelowsideofthepondtoallowforeasycleaningandrefilling.Polymersmaybeusedtopromotecoagulationandflocculationinaclosed-loopsystem.Polyacrylamide(PAM)addedtothewheelwashwateratarateof0.25-0.5poundsper1,000gallonsofwaterincreaseseffectivenessandreducescleanuptime.IfPAMisalreadybeingusedfordustorerosioncontrolandisbeingappliedbyawatertruck,thesametruckcanbeusedtochangethewashwater.MaintenanceThewheelwashshouldstartoutthedaywithfreshwater.StandardsThewashwatershouldbechangedaminimumofonceperday.Onlargeearthworkjobswheremorethan10-20trucksperhourareexpected,thewashwaterwillneedtobechangedmoreoften..Vohune11—ConstructionStormwaterPollutionPrevention—August20124-10a- Notes:Figure4.1.2—WheelWash1.Asphaltconstructionentrance6in.asphalttreatedbase(ATB).2.3-inchtrashpumpwithfloatsonthesuctionhose.3.Midpointspraynozzles,ifneeded.4.6-inchsewerpipewithbutterflyvalves.Bottomoneisadrain.Locatetoppipe’sinvert1footabovebottomofwheelwash.5.8footx8footsumpwith5feetofcatch.Buildsothesumpcanbecleanedwithatraekhoe.6.Asphaltcurbonthelowroadsidetodirectwaterbacktopond.7.6-inchsleeveunderroad.8.Ballvalves.9.15foot.ATBaprontoprotectgroundfromsplashingwater.VolumeIf—constructionStonuwaterPollutionPrevention—August20124-1]6SEWERPIPEWITHBUTTERFLYVALVES—.8x8SUMPWrnI5OFCATCH3TRASHPUMPWITHFLOATSAONSUCTiONHOSE=2SCHEDULE401—1/2SCHEDULE40-FORSPRAYERS_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _-IMIDPOINTSPRAYNOZZLESSLDPEh-c—hIFNEEDEDSLOPE1:1j.V=\CONSTRUCTiONL.SLOPEALXN_._ENTRANCE15AAPRONTOPROTECTBAVALVESASPHALTCURBONTHEGROUNDFROMSPLASHINGWATERLOWROADSIDETODIRECT6SLEEVEUNDERROADWATERSACKTOPONDIPLANviEwI-——15——20—IIIIiSISO.-ELEVATIONViEWICURBCSLEEVELOCATEINVERTorTOPorWHEELWASHPIPE1•ABOVEBOTTOMWATERLEVE8xWSUMP\LL7_iI__________ __ _____5.DRAINPIPENOTES:ISECTiONA—Al1:1SLOPE1.BUILD8*6SUMPTOACCOMODATECLEANINGBYTRACKHOE._-%itit$-wJ4p BMPC107:ConstructionRoadlParkingAreaStabilizationPurposeStabilizingsubdivisionroads,parkingareas,andotheron-sitevehicletransportationroutesimmediatelyaftergradingreduceserosioncausedbyconstructiontrafficorrunoff.conditionsofUseRoadsorparkingareasshallbestabilizedwherevertheyareconstructed.whetherpermanentortemporary,forusebyconstructiontraffic.HighVisibilityFencing(seeBMPC103)shallbeinstalled,ifnecessary,tolimittheaccessofvehiclestoonlythoseroadsandparkingareasthatarestabilized.Designand•Onareasthatwillreceiveasphaltaspartoftheproject,installthefirstInstallationliiiassoonaspossible.Specifications.A6-inchdepthof2-to4-inchcrushedrock,gravelbase,orcrushedsurfacingbasecourseshallbeappliedimmediatelyaftergradingorutilityinstallation.A4-inchcourseofasphalttreatedbase(ATB)mayalsobeused,ortheroad/parkingareamaybepaved.Itmayalsobepossibletousecementorcalciumchlorideforsoilstabilization.Ifcementorcementkilndustisusedforroadbasestabilization,pHmonitoringandBMPs(BMPsC252andC253)arenecessarytoevaluateandminimizetheeffectsonstormwater.Iftheareawillnotbeusedforpermanentroads,parkingareas,orstructures,a6-inchdepthofhogthelmayalsobeused,butthisislikelytorequiremoremaintenance.Wheneverpossible,constructionroadsandparkingarcasshallbeplacedonafirm,compactedsubgrade.Temporaryroadgradientsshallnotexceed15percent.Roadwaysshallbecarefullygradedtodrain.Drainageditchesshallbeprovidedoneachsideoftheroadwayinthecaseofacrownedsection,orononesideinthecaseofasuper-elevatedsection.DrainageditchesshallbedirectedtoasedimentcontrolBMP.Ratherthanrelyingonditches,itmayalsobepossibletogradetheroadsothatrunoffsheet-flowsintoaheavilyvegetatedareawithawell-developedtopsoil.Landscapedareasarenotadequate.Ifthisareahasatleast50feetofvegetationthatwatercanflowthrough,thenitisgenerallypreferabletousethevegetationtotreatrunoff,ratherthanasedimentpondortrap.The50feetshallnotincludewetlandsortheirbuffers.Ifrunoffisallowedtosheetfiowthroughadjacentvegetatedareas,itisvitaltodesigntheroadwaysandparkingareassothatnoconcentratedrunoffiscreated.•Stormdraininletsshallbeprotectedtopreventsediment-ladenwaterenteringthestormdrainsystem(seeBMPC220).MaintenanceInspectstabilizedareasregularly,especiallyafterlargestormevents.StandardsCrushedrock,gravelbase,etc.shallbeaddedasrequiredtomaintainaI7ohmzeII—ConstructionStonnwarerPollutionPrevention—August20124-12 stabledrivingsurfaceandtostabilizeanyareasthathaveeroded.Followingconstruction,theseareasshallberestoredtopre-constnictionconditionorbettertopreventfutureerosion.Perfornistreetcleaningattheendofeachdayormoreoftenifnecessary.VolumeIf—ConstructionStonnwaterPollutionPrevention—August20124-13— BMPC120:TemporaryandPermanentSeedingPurposeSeedingreduceserosionbystabilizingexposedsoils.Awell-establishedvegetativecoverisoneofthemosteffectivemethodsofreducingerosion.ConditionsofUseUseseedingthroughouttheprojectondisturbedareasthathavereachedfinalgradeorthatwillremainunworkedformorethan30days.TheoptimumseedingwindowsforwesternWashingtonareAprilIthroughJune30andSeptember1throughOctober1.BetweenJulyIandAugust30seedingrequiresirrigationuntil75percentgrasscoverisestablished.BetweenOctoberIandMarch30seedingrequiresacoverofmulchwithstraworanerosioncontrolblanketuntil75percentgrasscoverisestablished.ReviewalldisturbedareasinlateAugusttoearlySeptemberandcompleteallseedingbytheendofSeptember.Otherwise,vegetationwillnotestablishitselfenoughtoprovidemorethanaverageprotection.•Mulchisrequiredatalltimesforsccdingbecauseitprotectsseedsfromheat,moistureloss,andtransportduetorunoff.Mulchcanbeappliedontopoftheseedorsimultaneouslybyhydroseeding.SeeBMPCl21:Mulchingforspecifications.•Seedandmulch,alldisturbedareasnototherwisevegetatedatfinalsitestabilization.Finalstabilizationmeansthecompletionofallsoildisturbingactivitiesatthesiteandtheestablishmentofapermanentvegetativecover,orequivalentpermanentstabilizationmeasures(suchaspavement,riprap,gabionsorgeotextiles)whichwillpreventerosion.DesignandSeedretention/detentionpondsasrequired.Installation.InstallchannelsintendedforvegetationbeforestartingmajorSpecificationsearthworkandhydroseedwithaBondedFiberMatrix.Forvegetatedchannelsthatwillhavehighflows,installerosioncontrolblanketsoverhydroseed.Beforeallowingwatertoflowinvegetatedchannels,establish75percentvegetationcover.Ifvegetatedchannelscannotbeestablishedbyseedbeforewaterflow;installsodinthechannelbottom—overhydromulchanderosioncontrolblankets.kohune11—ConstructionStonnwarerPollutionPrevention—August20124-13-___ •Confirmtheinstallationofallrequiredsurfacewatercontrolmeasurestopreventseedfromwashingaway.•Hydroseedapplicationsshallincludeaminimumof1,500poundsperacreofmulchwith3percentlackifier.SeeBMPC121:Mulchingforspecifications.•Areasthatwillhaveseedingonlyandnotlandscapingmayneedcompostormeal-basedmulchincludedinthehydroseedinordertoestablishvegetation.Re-installnativetopsoilonthedisturbedsoilsurfacebeforeapplication.•Wheninstallingseedviahydroseedingoperations,onlyabout1/3oftheseedactuallyendsupincontactwiththesoilsurface.Thisreducestheabilitytoestablishagoodstandofgrassquickly.Toovercomethis,considerincreasingseedquantitiesbyupto50percent.•Enhancevegetationestablishmentbydividingthehydromulchoperationintotwophases:I.PhaseI-Installallseedandfertilizerwith25-30percentmulchandtackifierontosoilinthefirstlift.2.Phase2-Installtherestofthemulchandtackifieroverthefirstlift.Or,enhancevegetationby:I.Installingthemulch,seed,fertilizer,andtackifierinonelift.2.Spreadorblowstrawoverthetopofthehydromulchatarateof800-1000poundsperacre.3.Holdstrawinplacewithastandardtackifier.Bothoftheseapproacheswillincreasecostmoderatelybutwillgreatlyimproveandenhancevegetativeestablishment.Theincreasedcostmaybeoffsetbythereducedneedfor:•Irrigation.•Reapplicationofmulch.•Repairoffailedslopesurfaces.Thistechniqueworkswithstandardhydromuich(1,500poundsperacreminimum)andBFM/MBFMs(3,000poundsperacreminimum).•Seedmaybeinstalledbyhandif:•Temporaryandcoveredbystraw,mulch,ortopsoil.•Permanentinsmallareas(usuallylessthanIacre)andcoveredwithmulch,topsoil,orerosionblankets.•Theseedmixeslistedinthetablesbelowincluderecommendedmixesforbothtemporaryandpermanentseeding.Vohmze1!—ConstructionStormwaterPollutionPrevention—August20124-14____ _ __ _ ___ ___ _— •Applythesemixes,withtheexceptionofthewetlandmix,atarateof120poundsperacre.Thisratecanbereducedifsoilamendmentsorslow-releasefertilizersareused.•Consultthelocalsuppliersorthelocalconservationdistrictfortheirrecommendationsbecausetheappropriatemixdependsonavarietyoffactors,includinglocation,exposure,soiltype,slope,andexpectedfoottraffic.Alternativeseedmixesapprovedbythelocalauthoritymaybeused.•Othermixesmaybeappropriate,dependingonthesoiltypeandhydrologyofthearea.Table4.1.2liststhestandardmixforareasrequiringatemporaryvegetativecover.Table4.1.2TemporaryErosionControlSeedMix%Weight%Purity%GerminationChewingsorannualbluegrass409890Festucarubrava;conunutataorPoaannaPerennial‘ye-509890Loliumperenne—---—-----—Redtoporcolonialbentgrass592854grostisalbaor4gostistenuisWhitedutchclover59890Trifoliurnrepens•Table4±3listsarecommendedmixforlandscapingseed.Table4J.3LandscapingSeedMix%Weight0/Purifl%GerminationPerennialryeblend709890Lolnprenne----.—-Chewingsandredfescueblend309890Festucarubravar.contnutataorFestucanthraVohuneI!—ConstructionStormwaterPollutionPrevention—August20124-15-...:. Table4.1.4Low-GrowingTurfSeedMix%Weight%Purity%GerminationDwarftallfescue(severalvarieties)459890Festucaanuzthnaceavar.Dwarfperennialiye(Barclay)309890Loliumperennevar.bard—Redfescue209890FestucarubraColonialbentgrass59890AgrostistennisTable4.1.5listsamixforbioswalesandotherintermittentlywetareas.Table4.1.5BioswaleSeedMix*%Weight%Purity%GerminationTallormeadowfescue75-809890FestucaanwdinaceaorFestucaelatiorSeaside/Creepingbentgrass10-159285Agrostispalustris- -Redtopbentgrass5-109080AgrostisalbaorAgrostisgigantea*ModifiedBriargreen,Inc.HydroseedingGuideWetlandsSeedMixVohime1!—ConstructionStonnwaterPollutionPrevention—August20124-16.•Table4.1.4listsaturfseedmixfordrysituationswherethereisnoneedforwatering.Thismixrequiresverylittlemaintenance. •Table4.1.6listsalow-growing,relativelynon-invasiveseedmixappropriateforverywetareasthatarenotregulatedwetlands.Applythismixtureatarateof60poundsperacre.ConsultHydraulicPermitAuthority(HPA)forseedmixesifapplicable.Table4.1.6WetAreaSeedMix*%Weight%Purity%GerminationTallormeadowfescue60-709890FestucaarundinaceaorFestucaelatior_____Seaside/Creepingbentgrass10-159885Agrostispqlustris____-.______--Meadowfoxtail10-1590804frpocuruspratensis-_____-Alsikeclover1-69890-Redtopbentgrass1-69285Agmstisalba*ModWedBriargreen,Inc.HvdroseedingGuideWetlandsSeedMix•Table4.1.7listsarecommendedmeadowseedmixforinfrequentlymaintainedareasornon-maintainedareaswherecolonizationbynativeplantsisdesirable.Likelyapplicationsincluderuralroadandulilityright-of-way.SeedingshouldtakeplaceinSeptemberorveryearlyOctoberinordertoobtainadequateestablishmentpriortothewintermonths.Considertheappropriatenessofclover,afairlyinvasivespecies,inthemix.Amendingthesoilcanreducetheneedforclover.Table4.1.7MeadowSeedMix%Weight%Purity%GerminationRedtoporOregonbentgrass209285AgrostisalbaorAgrostisorçgqnensis_____-—Redfescue709890Festucarubra_____________Whitedutchclover109890TrifoliutnrepensVolumeII—ConstructionStormwaterPollutionPrevenrIo,z—August20)24-17 RougheningandRototilling:•Theseedbedshouldbefirmandrough.Roughenallsoilnomatterwhattheslope.Trackwalkslopesbeforeseedingifengineeringpurposesrequirecompaction.Backbladingorsmoothingofslopesgreaterthan4H:IVisnotallowediftheyaretobeseeded.•Restoration-basedlandscapepracticesrequiredeeperincorporationthanthatprovidedbyasimplesingle-passrototillingtreatment.Whereverpractical,initiallyripthesubgradetoimprovelong-termpermeability,infiltration,andwaterinflowqualities.Ataminimum,permanentareasshallusesoilamendmentstoachieveorganicmatterandpermeabilityperformancedefinedinengineeredsoil/landscapesystems.Forsystemsthataredeeperthan8inchescompletetherototillingprocessinmultiplelifts,orpreparetheengineeredsoilsystemperspecificationsandplacetoachievethespecifieddepth.Fertilizers:•Conductingsoilteststodeterminetheexacttypeandquantityoffertilizerisrecommended.Thiswillpreventtheover-applicationoffertilizer.•Organicmatteristhemostappropriateformoffertilizerbecauseitprovidesnutrients(includingnitrogen,phosphorus,andpotassium)intheleastwater-solubleform.•Ingeneral,use10-4-6N-P-K(nitrogen-phosphorus-potassium)fertilizeratarateof90poundsperacre.Alwaysuseslow-releasefertilizersbecausetheyaremoreefficientandhavefewerenvironmentalimpacts.Donotaddfertilizertothehydromulchmachine,oragitate,morethan20minutesbeforeuse.Toomuchagitationdestroystheslow-releasecoating.•Therearenumerousproductsavailablethattaketheplaceofchemicalfertilizers.Theseincludeseveralwithseaweedextractsthatarebeneficialtosoilmicrobesandorganisms.If100percentcottonseedmealisusedasthemulchinhydroseed,chemicalfertilizermaynotbenecessary.Cottonseedmealprovidesagoodsourceoflong-term,slow-release,availablenitrogen.BondedFiberMatrixandMechanicallyBondedFiberMatrix:•OnsteepslopesuseBondedFiberMatrix(BFM)orMechanicallyBondedFiberMatrix(MBFM)products.ApplyBFM/MBFMproductsataminimumrateof3,000poundsperacreofmulchwithapproximately10percenttackifier.Achieveaminimumof95percentsoilcoverageduringapplication.Numerousproductsareavailablecommercially.Installedproductspermanufacturer’sinstructions.Mostproductsrequire24-36hourstocurebeforerainfallandcannotbeinstalledonwetorsaturatedsoils.Vohane11—ConstructionStonnwaterPollutionPrevention-August20124-18ttst Generally,productscomein40-50poundbagsandincludeallnecessaryingredientsexceptforseedandfertilizer.BFMsandMBFMSprovidegoodalternativestoblanketsinmostareasrequiringvegetationestablishment.Advantagesoverblanketsinclude:•BFMandMBFMsdonotrequiresurfacepreparation.•HelicopterscanassistininstallingBFMandMBFMsinremoteareas.•Onslopessteeperthan2.5H:IV,blanketinstallersmayrequireropesandharnessesforsafety.•InstallingBFMandMBFMscansaveatleastS1,000peracrecomparedtoblankets.MaintenanceReseedanyseededareasthatfailtoestablishatleast80percentcoverStandards(100percentcoverforareasthatreceivesheetorconcentratedflows).Tfreseedingisineffective,useanalternatemethodsuchassodding,mulching,ornets/blankets.Ifwinterweatherpreventsadequategrassgrowth,thistimelimitmayberelaxedatthediscretionofthelocalauthoritywhensensitiveareaswouldotherwisebeprotected.•Reseedandprotectbymulchanyareasthatexperienceerosionafterachievingadequatecover.Reseedandprotectbymulchanyerodedarea.•Supplyseededareaswithadequatemoisture,butdonotwatertotheextentthatitcausesrunoff.ApprovedasEcologyhasapprovedproductsasabletomeettherequirementsofBMPEquivalentC120.TheproductsdidnotpassthroughtheTechnologyAssessmentProtocol—Ecology(TAPE)process.Localjurisdictionsmaychoosenottoacceptthisproductapprovedasequivalent,ormayrequireadditionaltestingpriortoconsiderationforlocaluse.TheproductsareavailableforreviewonEcology’swebsiteathttp://www.ecy.wa.gov/programs/wg/stormwater/newtech/epuivalent.html.Voiwne11—ConstructionStormwaterPollutionPrevention—August20124-19---:_____________________ BMPC151:ConcreteHandlingConcreteworkcangenerateprocesswaterandslurrythatcontainfineparticlesandhighpH,bothofwhichcanviolatewaterqualitystandardsinthereceivingwater.ConcretespillageorconcretedischargetosurfacewatersoftheStateisprohibited.UsethisBMPtominimizeandeliminateconcrete,concreteprocesswater,andconcreteslurryfromenteringwatersofthestate.ConditionsofUseAnytimeconcreteisused,utilizethesemanagementpractices.Concreteconstructionprojectsinclude,butarenotlimitedto,thefollowing:Curbs•Sidewalks•Roads•Bridges•Foundations•Floors•RunwaysDesignandInstallation•Washoutconcretetruckchutes,pumps,andinternalsintoformedareasonly.AssurethatwashoutofconcretetrucksisperformedoffVobmie11—ConstructionStormwaterPollutionPrevention—August20124-42Purpose Specificationssiteorindesignatedconcretewashoutareas.Donotwashoutconcretetrucksontotheground,orintostormdrains,openditches,streets,orstreams.RefertoBMPC154forinformationonconcretewashoutareas.Returnunusedconcreteremaininginthetruckandpumptotheoriginatingbatchplantforrecycling.Donotdumpexcessconcreteonsite,exceptindesignatedconcretewashoutareas.•Washoffhandtoolsincluding,butnotlimitedto,screeds,shovels,rakes,floats,andtrowelsintoformedareasonly.•Washequipmentdifficulttomove,suchasconcretepayersinareasthatdonotdirectlydraintonaturalorconstructedstormwaterconveyances.•Donotallowwashdownfromareas,suchasconcreteaggrcgatcdriveways,todraindirectlytonaturalorconstructedstomiwaterconveyances.•Containwashwaterandleftoverproductinalinedcontainerwhennoformedareasareavailable,.Disposeofcontainedconcreteinamannerthatdoesnotviolategroundwaterorsurfacewaterqualitystandards.•Alwaysuseformsorsolidbarriersforconcretepours,suchaspilings,within15-feetofsurfacewaters.•RefertoBMPsC252andC253forpHadjustmentrequirements.•RefertotheConstructionStormwaterGeneralPermitforpHmonitoringrequirementsiftheprojectinvolvesoneofthefollowingactivities:•Significantconcretework(greaterthan1,000cubicyardspouredconcreteorrecycledconcreteusedoverthelifeofaproject).•Theuseofengineeredsoilsamendedwith(butnotlimitedto)Portlandcement-treatedbase,cementkilndustorflyash.•Dischargingstormwatertosegmentsofwaterbodiesonthe303(d)list(Category5)forhighpH.MaintenanceCheckcontainersforholesinthelinerdailyduringconcretepoursandStandardsrepairthesameday.Volume!!—ConstructionSton;nvaterPollutionPrevention—August20124-43 BMPC160:CertifiedErosionandSedimentControlLeadPurposeTheprojectproponentdesignatesatleastonepersonastheresponsiblerepresentativeinchargeoferosionandsedimentcontrol(ESC),andwaterqualityprotection.ThedesignatedpersonshallbetheCertifiedErosionandSedimentControlLead(CESCL)whoisresponsibleforensuringcompliancewithalllocal,state,andfederalerosionandsedimentcontrolandwaterqualityrequirements.ConditionsofUseACESCLshallbemadeavailableonprojectsoneacreorlargerthatdischargestormwatertosurfacewatersofthestate.SiteslessthanoneacremayhaveapersonwithoutCESCLcertificationconductinspections;samplingisnotrequiredonsitesthatdisturblessthananacre.•TheCESCLshall:•HaveacurrentcertificateprovingattendanceinanerosionandsedimentcontroltrainingcoursethatmeetstheminimumESCtrainingandcertificationrequirementsestablishedbyEcology(seedetailsbelow).EcologywillmaintainalistofESCtrainingandcertificationprovidersat:http://www.ecy.wa.gov/programs/wg/stormwater/cescl.htmlOR•BeaCertifiedProfessionalinErosionandSedimentControl(CPESC);foradditiona’informationgoto:www.cpesc.netSpecifications•Certificationshallremainvalidforthreeyears.•TheCESCLshallhaveauthoritytoactonbehalfofthecontractorordeveloperandshallbeavailable,oron-call,24hoursperdaythroughouttheperiodofconstruction.•TheConstructionSWPPPshallincludethename,telephonenumber,faxnumber,andaddressofthedesignatedCESCL.•ACESCLmayprovideinspectionandcomplianceservicesformultipleconstructionprojectsinthesamegeographicregion.DutiesandresponsibilitiesoftheCESCLshallinclude,butarenotlimitedtothefollowing:•MaintainingpermitifieonsiteatalltimeswhichincludestheConstructionSWPPPandanyassociatedpermitsandplans.•DirectingBMPinstallation,inspection,maintenance,modification,andremoval.Vohune11—ConstructionStonnwaterPollutionPrevention—August20124-53 •UpdatingallprojectdrawingsandtheConstructionSWPPPwithchangesmade.•CompletinganysamplingrequirementsincludingreportingresultsusingWebDMR.•Keepingdailylogs,andinspectionreports.Inspectionreportsshouldinclude:•Inspectiondate/time.•Weatherinformation;generalconditionsduringinspectionandapproximateamountofprecipitationsincethelastinspection.•AsummaryorlistofallBMPsimplemented,includingobservationsofallerosion/sedimentcontrolstructuresorpractices.Thefollowingshallbenoted:1.LocationsofBMPsinspected.2.LocationsofBMPsthatneedmaintenance.3.LocationsofBMPsthatfailedtooperateasdesignedorintended.4.LocationsofwhereadditionalordifferentBMPsarerequired.•Visualmonitoringresults,includingadescriptionofdischargedstormwater.Thepresenceofsuspendedsediment,turbidwater,discoloration,andoilsheenshallbenoted,asapplicable.•Anywaterqualitymonitoringperformedduringinspection.•Generalcommentsandnotes,includingabriefdescriptionofanyBMPrepairs,maintenanceorinstallationsmadeasaresultoftheinspection.•Facilitate,participatein,andtakecorrectiveactionsresultingfrominspectionsperformedbyoutsideagenciesortheowner.BMPC162:SchedulingPurposeSequencingaconstructionprojectreducestheamountanddurationofsoilexposedtoerosionbywind,rain,runoff,andvehicletracking.ConditionsofUseTheconstructionsequencescheduleisanorderlylistingofallmajorland-disturbingactivitiestogetherwiththenecessaryerosionandsedimentationcontrolmeasuresplannedfortheproject.Thistypeofscheduleguidesthecontractoronworktobedonebeforeotherworkisstartedsothatseriouserosionandsedimentationproblemscanbeavoided.Followingaspecifiedworkschedulethatcoordinatesthetimingofland-disturbingactivitiesandtheinstallationofcontrolmeasuresisperhapsthemostcost-effectivewayofcontrollingerosionduringconstruction.TheremovalofsurfacegroundcoverleavesasitevulnerabletoacceleratedVohune11—constructionStormwaterPollutionPrevention—August20124-54- erosion.Constructionproceduresthatlimitlandclearingprovidetimelyinstallationoferosionandsedimentationcontrols,andrestoreprotectivecoverquicklycansignificantlyreducetheerosionpotentialofasite.Design.Minimizeconstructionduringrainyperiods.Co,,siderations•Scheduleprojectstodisturbonlysmallportionsofthesiteatanyonetime.Completegradingassoonaspossible.Immediatelystabilizethedisturbedportionbeforegradingthenextportion.Practicestagedseedinginordertorevegetatecutandfillslopesastheworkprogresses.J’olu,ne11—ConstructionSronnwaterPollutionPrevention—August20/24-55-Wn1’t 4.2RunoffConveyanceandTreatmentBMPsThissectioncontainsthestandardsandspecificationsforRunoffConveyanceandTreatmentBMPs.Table4.2.1,below,showstherelationshipoftheBMPsinSection4.2totheConstructionStormwaterPollutionPreventionPlan(SWPPP)ElementsdescribedinSection3.3.3.Table4.2.1RunoffConveyanceandTreatmentBMPsbySWPPPElementElement#1Element#2ElementflElement#13ElemenI#5EIennLElermattISElerrenI#11ElerTeni#12PreserveEstablishStabilizePmleaLOWBl.IPorElenntNanStabilizeProtectConirDiMaintainManagethechanneisWgetalonll.IarkConstructionSoilsSlopesPollutantsaMPsPmjcctliwactClearingtintsaccessaidOuUelsDevelopmentBLIPClOt:PreRivingNeutralWqetalonBLIPC102:Bulterzones1.1SMPClOlHighVisibilityPlasticorMetsifenceaMPcios:StabitzedContuaionIEntranceIExitBLIPClad:iieelWashIBLIPC107:ConstructionRoa&PathngIAreaStathtonOMPCIZ)TenoraryandPermanentIISeedingBLIPC121:MuldiEng11BLIPCm:NetsaidBlanketsII/IOURCiflPlesdeCoveringIaMPC12tSoddingIBLIPC125:ropsoilingIConpostlngIBLIPC126:PolyaaylanidetarSoilErosionProtecflonBLIPcirsijttnRougheningBLIPC131:GradlentTeaaces11BLIPC140:DustControl/BLIPCISC:MaterialsOnHandI/BlIPCISI:ConcreteHandlingIBLIPC152SavecuningandSudating/PollutionPreventionBLIPCISZMaterialDelivery.StorageandConLainnntBLIPelM:ConcreteWastioutAreaIBlIPCitCertifiedErooiaidIISehmntCofitrtlLeadBLIPC162:ScheaullngIVolume!!—ConstructionStonnwaterPollutionPrevention-August20124-56 BMPC220:StormDrainInletProtectionPurposeConditionsofUseStormdraininletprotectionpreventscoarsesedimentfromenteringdrainagesystemspriortopermanentstabilizationofthedisturbedarea.Usestormdraininletprotectionatinletsthatareoperationalbeforepermanentstabilizationofthedisturbeddrainagearea.Provideprotectionforallstormdraininletsdownslopeandwithin500feetofadisturbedorconstructionarea,unlessconveyingrunoffenteringcatchbasinstoasedimentpondortrap.Alsoconsiderinletprotectionforlawnandyarddrainsonnewhomeconstruction.Thesesmallandnumerousdrainscoupledwithlackofguttersinnewhomeconstructioncanaddsignificantamountsofsedimentintotheroofdrainsystem.Ifpossibledelayinstallinglawnandyarddrainsuntiljustbeforelandscapingorcapthesedrainstopreventsedimentfromenteringthesystemuntilcompletionoflandscaping.Provide18-inchesofsodaroundeachfinishedlawnandyarddrain.Table4.2.2listsseveraloptionsforinletprotection.Allofthemethodsforstormdraininletprotectiontendtoplugandrequireahighfrequencyofmaintenance.Limitdrainageareastooneacreorless.Possiblyprovideemergencyoverflowswithadditionalend-of-pipetreatmentwherestormwaterpondingwouldcauseahazard.VoiwneII—Co,,structjo,,StormwaterPollutionPrevention—August2012—4-79 Table4.2.2StormDrainInletProtectionApplicableforTypeofInletEmergencyPaved!EarthenProtectionOverflowSurfacesConditionsofUseDropInletProtectionExcavateddropinletYes,EarthenApplicableforheavyflows.Easyprotectiontemporarytomaintain.LargeareafloodingwillRequirement:30’X30’IaereoccurBlockandgraveldropYesPavedorEarthenApplicableforheavyconcentratedinletprotectionflows.Willnotpond.GravelandwiredropNoApplicableforheavyconcentratedinletprotectionflows.Willpond.Canwithstandtraffic.CatchbasinfiltersYesPavedorEarthenFrequentmaintenancerequired.CurbInletProtectionCurbinletprotectionSmallcapacityPavedUsedforsturdy,morecompactwithawoodenweiroverflowinstallation.BlockandgravelcurbYesPavedSturdy,butlimitedfiltration.inletprotectionCulvertInletProtectionCulvertinletsediment18monthexpectedlife.trapDesignandExcavatedDropInletProtection-AnexcavatedimpoundmentaroundtheInstallationstormdrain.SedimentsettlesoutofthestormwaterpriortoenteringtheSpecificationsstormdrain.•Provideadepthof1-2ftasmeasuredfromthecrestoftheinletstrocture.•Slopesidesofexcavationnosteeperthan2K:IV.•Minimumvolumeofexcavation35cubicyards.•Shapebasintofitsitewithlongestdimensionorientedtowardthelongestinflowarea.•Installprovisionsfordrainingtopreventstandingwaterproblems.•Cleartheareaofalldebris.•Gradetheapproachtotheinletuniformly.•Drillweepholesintothesideoftheinlet.•Protectweepholeswithscreenwireandwashedaggregate.•Sealweepholeswhenremovingstructureandstabilizingarea.VolumeII—ConstructionStonnwaterPollutionPrevention—August20124-80 •Buildatemporarydike,ifnecessary,tothedownslopesideofthestructuretopreventbypassflow.BlockandGravelFilter-Abarrierformedaroundthestormdraininletwithstandardconcreteblocksandgravel.SeeFigure4.2.8.•ProvideaheightofIEo2feetaboveinlet.•Recessthefirstrow2-inchesintothegroundforstability.•Supportsubsequentcoursesbyplacinga2x4throughtheblockopening.•Donotusemortar.•Laysomeblocksinthebottomrowontheirsidefordewateringthepool.•Placehardwareclothorcomparablewiremeshwith½-inchopeningsoverallblockopenings.•Placegraveljustbelowthetopofblocksonslopesof21-I:IVorflatter.•Analternativedesignisagraveldonut.•Provideaninletslopeof3H:IV.•Provideanoutletslopeof2H:IV.•Provideal-footwidelevelstoneareabetweenthestructureandtheinlet.•Useinletslopestones3inchesindiameterorlarger.•Usegravel¼-to¼-inchataminimumthicknessof1-footfortheoutletslope.VolumeI!—ConstructionStonnwaterPollutionPrevention—August20124-81— Figure4.2.8—BlockandGravelFillerGravelandWireMeshFilter-Agravelbarrierplacedoverthetopoftheinlet.Thisstructuredoesnotprovideanoverflow.•Useahardwareclothorcomparablewiremeshwith‘/2-inchopenings.•Usecoarseaggregate.•Provideaheight1-footormore,18-incheswiderthaninletonallsides.•Placewiremeshoverthedropinletsothatthewireextendsaminimumof1-footbeyondeachsideoftheinletstnicture.Overlapthestripsifmorethanonestripofmeshisnecessary.Volume11—ConstructionStormwaterPollutionPrevention—August2012PlanViewDrainGrateConcreteBlock‘pGravelBackfillSectionA-AGravelBackfillConcreteBlockWireScreenor-FilterFabricOverflowWater___________________PondingHeightfinflI—Notes:1.Dropinletsedimentbarriersaretobeusedforsmall,nearlyleveldrainageareas.(lessIhan5%)2.Excavateabasinofsufficientsizeadjacenttothedropinlet.3.ThelopofIhestructure(pondingheight)mustbewellbelowIhegroundelevationdownslopctopreventrunofffrombypassing(heinlet.Atemporarydikemaybenecessaryonthedownslopesideoftheslnicture.4-82 •Placecoarseaggregateoverthewiremesh.•Provideatleasta12-inchdepthofgravelovertheentireinletopeningandextendatleast18-inchesonallsides.CatchbasinFilters—Useinsertsdesignedbymanufacturersforconstructionsites.Thelimitedsedimentstoragecapacityincreasestheamountofinspectionandmaintenancerequired,whichmaybedailyforheavysedimentloads.Toreducemaintenancerequirementscombineacatchbasinfilterwithanothertypeofinletprotection.Thistypeofinletprotectionprovidesflowbypasswithoutoverflowandthereforemaybeabettermethodforinletslocatedalongactiverights-of-way.•Provides5cubicfeetofstorage.•Requiresdewateringprovisions.•Providesahigh-flowbypassthatwillnotclogundernormaluseataconstructionsite.•Insertthecatchbasinfilterinthecatchbasinjustbelovthegrating.CurbInletProtectionwithWoodenWeir—Barrierformedaroundacurbinletwithawoodenframeandgravel.•Usewiremeshwith½-inchopenings.•Useextrastrengthfiltercloth.•Constructaframe.•Attachthewireandfilterfabrictotheframe.•Pilecoarsewashedaggregateagainstwire/fabric.•Placeweightonframeanchors.BlockandGravelCurbItiletProtection—Barrierformedaroundacurbinletwithconcreteblocksandgravel.SeeFigure4.2.9.•Usewiremeshwith‘/2-inchopenings.•Placetwoconcreteblocksontheirsidesabuttingthecurbateithersideoftheinletopening.Thesearespacerblocks.•Placea2x4studthroughtheouterholesofeachspacerblocktoalignthefrontblocks.•Placeblocksontheirsidesacrossthefrontoftheinletandabuttingthespacerblocks.•Placewiremeshovertheoutsideverticalface.•Pilecoarseaggregateagainstthewiretothetopofthebaffler.CurbandGutterSedimentBarrier—Sandbagorrockberm(ñprapandaggregate)3feethighand3feetwideinahorseshoeshape.SeeFigure4.2.10.Volume!!—Constructio,zStormwaterPollutionPrevention—August20/24-83 •Constructahorseshoeshapedberm,facedwithcoarseaggregateifusingriprap,3feethighand3feetwide,atleast2feetfromtheinlet.•Constructahorseshoeshapedsedimentationtrapontheoutsideofthebermsizedtosedimenttrapstandardsforprotectingaculvertinlet.Maintenance•Inspectcatchbasinfiltersfrequently,especiallyafterstormevents.StandardsCleanandreplacecloggedinserts.Forsystemswithcloggedstonefilters:pullawaythestonesfromtheinletandcleanorreplace.Analternativeapproachwouldbetousethecloggedstoneasfillandputfreshstonearoundtheinlet.•Donotwashsedimentintostormdrainswhilecleaning.Spreadallcxcavatcdmaterialevenlyoverthesurroundinglandareaorstockpileandstabilizeasappropriate.ApprovedasEcologyhasapprovedproductsasabletomeettherequirementsofBMPEqznva!entC220.TheproductsdidnotpassthroughtheTechnologyAssessmentProtocol—Ecology(TAPE)process.Localjurisdictionsmaychoosenottoacceptthisproductapprovedasequivalent,ormayrequireadditionaltestingpriortoconsiderationforlocaluse.TheproductsareavailableforreviewonEcology’swebsiteathttp://www.ecy.wa.gov/programs/wQ/stormwater/newtech/eQuivalent.html.Volume11—ConstructionStormwaterPollutionPrevention—.4ugust20124-84 PlanView1Useblockandgraveltypesedimentbarrierwhencurbinletislocatedingentlyslopingstreetsegment,wherewatercanpondandallowsedimenttoseparatefromrunoff.2.Barriershallallowforoverflowfromseverestormevent,3.Inspectbarriersandremovesedimentaftereachstormevent.Sedimentandgravelmustberemovedfromthetraveledwayimmediately.Figure4.2.9—BlockandGravelCurbInletProtectionVolume11—ConstnictionStormwaterPollutionPrevention-August2012BackofSidewalkAICBackofCurbCatchBasin2x4WoodStudConcreteBlockSectionA-AVI’Drain(20mm)VI’DrainGravel(20mm)ConcreteBlockPondingHeightConcreteBlockWireScreenorFilterFabricNOTES:(100x50TimberStud)1CurbInlet>//>/7CatchBasin4-85 PlanViewBackofSidewalkNOTES:1.Placecurbtypesedimentbarriersongentlyslopingstreetsegments,wherewatercanpondandallowsedimenttoseparatefrommuoff.2.Sandbagsofeitherburlaporwoven‘geotextile’fabric,arefilledwithgravel,layeredandpackedtightly.3.Leaveaonesandbaggapinthetoprowtoprovideaspillwayforoverflow.4.Inspectbarriersandremovesedimentaftereachstormevent.Sedimentandgravelmustberemovedfromthetraveledwayimmediately.Figure4.2.10—CurbandGutterBarrierVohuneII—ConstructionStonnwaterPollutionPrevention—August2012.BurlapSackstoontoCurbCatchBasinCurbInletRUNOFFRUNOFFBackofCurbGravelFilledSandbagsStackedTightly4-86 ... StormwaterPollutionPreventionPlanAppendixC—AlternativeBMPsThefoLlowingincludesalistofpossiblealternativeBMPsforeachofthe12elementsnotdescribedinthemainSWPPPtext.ThislistcanbereferencedintheeventaBMPforaspecificelementisnotfunctioningasdesignedandanalternativeBMPneedstobeimplemented.Element#1-MarkClearingLimitsElement#2-EstablishConstructionAccessElement#3-ControlFlowRatesElement#4-InstallSedimentControlsStrawBaleBarrier(BMPC230)SirawWattles(BMPC235)StormDrainInletProtection(BMPC220)AdvancedBMPs:Element#5-StabilizeSoilsPreservingNaturalVegetation(BMPCl01)Element#6-ProtectSlopesElement#8-StabilizeChannelsandOutletsChannelLining(BMPC202)StrawWattles(BMPC235)InterceptorDikeandSwale(BMPC200)Element#10-ControlDewateringCheckDams(BMPC207)OutletProtection(BMPC209)AdditionalAdvancedBMPstoControlDewatering:.27 BMPClOl:PreservingNaturalVegetationPurposeThepurposeofpreservingnaturalvegetationistoreduceerosionwhereverpracticable.Limitingsitedisturbanceisthesinglemosteffectivemethodforreducingerosion.Forexample,coniferscanholdtiptoabout50percentofallrainthatfallsduringastorm.Up1020-30percentofthisrainmayneverreachthegroundbutistakenupbythetreeorevaporates.Anotherbenefitisthattherainheldinthetreecanbereleasedslowlytothegroundafterthestorm.ConditionsofUseNaturalvegetationshouldbepreservedonsteepslopes,nearperennialandintermittentwatercoursesorswales,andonbuildingsitesinwoodedareas.•Asrequiredbylocalgovernments.•Phaseconstructiontopreservenaturalvegetationontheprojectsiteforaslongaspossibleduringtheconstructionperiod.DesignandNaturalvegetationcanbepreservedinnaturalclumpsorasindividualInstallationtrees,shrubsandvines.SpecificationsThepreservationofindividualplantsismoredifficultbecauseheavyequipmentisgenerallyusedtoremoveunwantedvegetation.Thepointstorememberwhenattemptingtosaveindividualplantsare:•Istheplantworthsaving?Considerthelocation,species,size,age,vigor,andtheworkinvolved.Localgovernmentsmayalsohaveordinancestosavenaturalvegetationandtrees.•Fenceorclearlymarkareasaroundtreesthataretobesaved.Itispreferabletokeepgrounddisturbanceawayfromthetreesatleastasfaroutasthedripline.Plantsneedprotectionfromthreekindsofinjuries:•ConstructionEquipment-Thisinjurycanbeaboveorbelowthegroundlevel.Damageresultsfromscarring,cuttingofroots,andcompactionofthesoil.Placingafencedbufferzonearoundplantstobesavedpriortoconstructioncanpreventconstructionequipmentinjuries.•GradeChanges-Changingthenaturalgroundlevelwillaltergrades,whichaffectstheplant’sabilitytoobtainthenecessaryair,water,andminerals.Minorfillsusuallydonotcauseproblemsalthoughsensitivitybetweenspeciesdoesvaryandshouldbechecked.Treescantypicallytoleratefillof6inchesorless.Forshrubsandotherpiants,thefillshouldbeless.Whentherearemajorchangesingrade,itmaybecomenecessarytosupplyairtotherootsofplants.Thiscanbedonebyplacingalayerofgravelandatilesystemovertherootsbeforethefillismade.Atilesystemprotectsatreefromaraisedgrade.ThetilesystemshouldbeVolumeII—Co,istructionStonnwaterPollutionPrevention—August20124-3 laidoutontheoriginalgradeleadingfromadrywellaroundthetreetrunk.Thesystemshouldthenbecoveredwithsmallstonestoallowairtocirculateovertherootarea.Loweringthenaturalgroundlevelcanseriouslydamagetreesandshrubs.Thehighestpercentageoftheplantrootsareintheupper12inchesofthesoilandcutsofonly2-3inchescancauseseriousinjury.Toprotecttherootsitmaybenecessarytoterracetheimmediateareaaroundtheplantstobesaved.Ifrootsareexposed,constructionofretainingwallsmaybeneededtokeepthesoilinplace.Plantscanalsobepreservedbyleavingthemonanundisturbed,gentlyslopingmound.Toincreasethechancesforsurvival,itisbesttolimitgradechangesandothersoildisturbancestoareasoutsidethedriplineoftheplant.Excavations-Protecttreesandotherplantswhenexcavatingfordrainfields,power,water,andsewerlines.Wherepossible,thetrenchesshouldberoutedaroundtreesandlargeshrubs.Whenthisisnotpossible,itisbesttotunnelunderthem.Thiscanbedonewithhandtoolsorwithpoweraugers.Ifitisnotpossibletoroutethetrencharoundplantstobesaved,thenthefollowingshouldbeobserved:Cutasfewrootsaspossible.Whenyouhavetocut,cutclean.Paintcutrootendswithawooddressinglikeasphaltbasepaintifrootswillbeexposedformorethan24-hours.Backfillthetrenchassoonaspossible.Tunnelbeneathrootsystemsasclosetothecenterofthemaintrunktopreservemostoftheimportantfeederroots.Someproblemsthatcanbeencounteredwithafewspecifictreesare:•Maple,Dogwood,Redalder,Westernhemlock,Westernredcedar,andDouglasfirdonotreadilyadjusttochangesinenvironmentandspecialcareshouldbetakentoprotectthesefrees.•ThewindthrowhazardofPacificsilverfirandmadronaishigh,whilethatofWesternhemlockismoderate.Thedangerofwindthrowincreaseswheredensestandshavebeenthinned.Otherspecies(unlesstheyareonshallow,wetsoilslessthan20inchesdeep)havealowwindthrowhazard.•Cottonwoods,maples,andwillowshavewater-seekingroots.Thesecancausetroubleinsewerlinesandinfiltrationfields.Ontheotherhand,theythriveinhighmoistureconditionsthatothertreeswouldnot.•ThinningoperationsinpureormixedstandsofGrandfir,Pacificsilverfir,Noblefir,Sitkaspruce,Westernredcedar,Westernhemlock,Pacificdogwood,andRedaldercancauseseriousdiseaseproblems.Diseasecanbecomeestablishedthroughdamagedlimbs,trunks,roots,Vohone!I—ConstructionStor,nwaterPollutionPrevention—August20124-4 4faintenanceStandardsandfreshlycutstumps.Diseasedandweakenedtreesarealsosusceptibletoinsectattack.Inspectflaggedand/orfencedareasregularlytomakesureflaggingorfencinghasnotbeenremovedordamaged.Iftheflaggingorfencinghasbeendamagedorvisibilityreduced,itshallberepairedorreplacedimmediatelyandvisibilityrestored.•Iftreerootshavebeenexposedorinjured,“prune”cleanlywithanappropriatepruningsaworlopersdirectlyabovethedamagedrootsandrecoverwithnativesoils.Treatmentofsapflowingtrees(fir,hemlock,pine,softmaples)isnotadvisedassapformsanaturalhealingbarrier.BMPC102:BufferZonesPurposeConditionsofUseDesignandInstallationSpecificationsCreationofanundisturbedareaorstripofnaturalvegetationoranestablishedsuitableplantingthatwillprovidealivingfiltertoreducesoilerosionandrunoffvelocities.Naturalbufferzonesareusedalongstreams,wetlandsandotherbodiesofwaterthatneedprotectionfromerosionandsedimentation.Vegetativebufferzonescanbeusedtoprotectnaturalswalesandcanbeincorporatedintothenaturallandscapingofanarea.Critical-areasbufferzonesshouldnotbeusedassedimenttreatmentareas.Theseareasshallremaincompletelyundisturbed.Thelocalpermittingauthoritymayexpandthebufferwidthstemporarilytoallowtheuseoftheexpandedareaforremovalofsediment.•Preservingnaturalvegetationorplantingsinclumps,bisgenerallytheeasiestandmostsuccessfulmethod.•Leaveallunstablesteepslopesinnaturalvegetation.locks,orstrips•Markclearinglimitsandkeepallequipmentandconstructiondebrisoutofthenaturalareasandbufferzones.Steelconstructionfencingisthemosteffectivemethodinprotectingsensitiveareasandbuffers.Alternatively,wire-backedsiltfenceonsteelpostsismarginallyeffective.Flaggingaloneistypicallynoteffective.•Keepallexcavationsoutsidethedriplineoftreesandshrubs.ftlaintenanceStandards•Donotpushdebrisorextrasoilintothebufferzoneareabecauseitwillcausedamagefromburyingandsmothering.•Vegetativebufferzonesforstreams,lakesorotherwaterwaysshallbeestablishedbythelocalpermittingauthorityorotherstateorfederalpermitsorapprovals.Inspecttheareafrequentlytomakesureflaggingremainsinplaceandthearearemainsundisturbed.Replacealldamagedflaggingimmediately.Volume1!—ConstructionStormwaterPollutionPrevention—August20124-5 BMPC121:MulchingPurposeMulchingsoilsprovidesimmediatetemporaryprotectionfromerosion.Mulchalsoenhancesplantestablishmentbyconservingmoisture,holdingfertilizer,seed,andtopsoilinplace,andmoderatingsoiltemperatures.Thereisanenormousvarietyofmulchesthatcanbeused.Thissectiondiscussesonlythemostcommontypesofmulch.Asatemporarycovermeasure,mulchshouldbeused:ConditionsofUse•Forlessthan30daysondisturbedareasthatrequirecover.•Atalltimesforseededareas,especiallyduringthewetseasonandVolume1!—ConstructionStormwaterPollutionPrevention—August20124-19 BMPC123:PlasticCoveringPurposePlasticcoveringprovidesimmediate,short-termerosionprotectiontoslopesanddisturbedareas.ConditionsofPlasticcoveringmaybeusedondisturbedareasthatrequirecoverUsemeasuresforlessthan30days,exceptasstatedbelow.Plasticisparticularlyuseflulforprotectingcutandfillslopesandstockpiles.Note:Therelativelyrapidbreakdownofmostpolyethylenesheetingmakesitunsuitablefortong-term(greaterthansixmonths)applications.•Duetorapidrunoffcausedbyplasticcovering,donotusethismethodupslopeofareasthatmightbeadverselyimpactedbyconcentratedrunoff.Suchareasincludesteepand/orunstableslopes.•Plasticsheetingmayresultinincreasedrunoffvolumesandvelocities,requitingadditionalon-sitemeasurestocounteracttheincreases.Creatingatroughwithwattlesorothermaterialcanconveycleanwaterawayfromtheseareas.•Topreventundercutting,trenchandbackfillrolledplasticcoveringproducts.•Whileplasticisinexpensivetopurchase,theaddedcostofinstallation,maintenance,removal,anddisposalmakethisanexpensivematerial,uptoS1.50-2.00persquareyard.•Wheneverplasticisusedtoprotectslopesinstallwatercollectionmeasuresatthebaseoftheslope.Thesemeasuresincludeplastic-coveredberms,channels,andpipesusedtocoveycleanrainwaterawayfrombaresoilanddisturbedareas.Donotmixcleanrunofffromaplasticcoveredslopewithdirtyrunofffromaproject.•Otherusesforplasticinclude:1.Temporaryditchliner.2.Pondlinerintemporarysedimentpond.3.Linerforbermedtemporaryfuelstorageareaifplasticisnotreactivetothetypeoffuelbeingstored.4.Emergencyslopeprotectionduringheavyrains.5.Temporarydrainpipe(“elephanttrunk”)usedtodirectwater.Designand•Plasticslopecovermustbeinstalledasfollows:Installation1.Runplasticupanddownslope,notacrossslope.Specifications2.Plasticmaybeinstalledperpendiculartoaslopeiftheslopelengthislessthan10feet.3.Minimumof8-inchoverlapatseams.Volume!!—ConstructionStonnwaterPollutionPrevention—August2Q124-26 4.Onlongorwideslopes,orslopessubjecttowind,tapeallseams.5.Placeplasticintoasmall(12-inchwideby6-inchdeep)slottrenchatthetopoftheslopeandbackfillwithsoiltokeepwaterfromflowingunderneath.6.Placesandfilledburlaporgeotextilebagsevery3to6feetalongseamsandtiethemtogetherwithtwinetoholdtheminplace.7.Inspectplasticforrips,tears,andopenseamsregularlyandrepairimmediately.Thispreventshighvelocityrunofffromcontactingbaresoilwhichcausesextremeerosion.8.Sandbagsmaybeloweredintoplacetiedtoropes.However,allsandbagsmustbestakedinplace.•Plasticsheetingshallhaveaminimumthicknessof0.06millimeters.•Iferosionatthetoeofaslopeislikely,agravelberm,riprap,orothersuitabLeprotectionshallbeinstalledatthetoeoftheslopeinordertoreducethevelocityofrunoff.Maintena,,ce•Tomsheetsmustbereplacedandopenseamsrepaired.Standards•Completelyremoveandreplacetheplasticifitbeginstodeteriorateduetoultravioletradiation.•Completelyremoveplasticwhennolongerneeded.•DisposeofoldtiresusedtoweightdownpLasticsheetingappropriately.ApprovedasEcologyhasapprovedproductsasabletomeettherequirementsofBMPEquivalentCl23.TheproductsdidnotpassthroughtheTechnologyAssessmentProtocol—Ecology(TAPE)process.Localjurisdictionsmaychoosenottoacceptthisproductapprovedasequivalent,ormayrequireadditionaltestingpriortoconsiderationforlocaluse.TheproductsareavailableforreviewonEcology’swebsiteathttp:T/www.ecv.wa.gov/proQrams!wglstormwater!newtech/eguivalent.htmlBMPC124:SoddingPurposeThepurposeofsoddingistoestablishpermanentturfforimmediateerosionprotectionandtostabilizedrainagewayswhereconcentratedoverlandflowvilloccur.OmditionsofUseSoddingmaybeusedinthefollowingareas:•Disturbedareasthatrequireshort-termorlong-termcover.•Disturbedareasthatrequireimmediatevegetativecover.•Allwaterwaysthatrequirevegetativelining.Waterwaysmayalsobeseededratherthansodded,andprotectedwithanetorblanket.VolumeII—ConstructionStonnwaterPollutionPrevention—August20)24-27 DesignandSodshallbefreeofweeds,ofuniformthickness(approximately1-inchInstallationthick),andshallhaveadenserootmatformechanicalstrength.SpecificationsThefollowingstepsarerecommendedforsodinstallation:Shapeandsmooththesurfacetofinalgradeinaccordancewiththeapprovedgradingplan.Theswaleneedstobeoverexcavated4to6inchesbelowdesignelevationtoallowroomforplacingsoilamendmentandsod.•Amend4inches(minimum)ofcompostintothetop8inchesofthesoiliftheorganiccontentofthesoilislessthantenpercentorthepermeabilityislessthan0.6inchesperhour.Seehttp://www.ecy.wa.gov/proarams/swfalorganics/soil.htmlforfurtherinformation.•Fertilizeaccordingtothesupplier’srecommendations.•WorklimeandfertilizerIto2inchesintothesoil,andsmooththesurface.•Laystripsofsodbeginningatthelowestareatobesoddedandperpendiculartothedirectionofwaterflow.Wedgestripssecurelyintoplace.Squaretheendsofeachstriptoprovideforaclose,tightfit.Staggerjointsatleast12inches.Stapleonslopessleeperthan31-1:IV.Stapletheupstreamedgeofeachsodstrip.•Rollthesoddedareaandirrigate.•Whensoddingiscarriedoutinalternatingstripsorotherpatterns,seedtheareasbetweenthesodimmediatelyaftersodding.MaintenanceIfthegrassisunhealthy,thecauseshallbedeterminedandappropriateStandardsactiontakentoreestablishahealthygroundcover.Ifitisimpossibletoestablishahealthygroundcoverduetofrequentsaluration,instability,orsomeothercause,thesodshallberemoved,theareaseededwithanappropriatemix,andprotectedwithanetorblanket.BMPC125:TopsoilingICompostingPurposeTopsoilingandcompostingprovideasuitablegrowthmediumforfinalsitestabilizationwithvegetation.Whilenotapermanentcoverpracticeinitself,topsoilingandcompostingareanintegralcomponentofprovidingpermanentcoverinthoseareaswherethereisanunsuitablesoilsurfaceforplantgrowth.UsethisBMPinconjunctionwithotherBMPssuchasseeding,mulching,orsodding.Nativesoilsanddisturbedsoilsthathavebeenorganicallyamendednotonlyretainmuchmorestormwater,buttheyalsoserveaseffectivebiofiltersforurbanpollutantsand,bysupportingmorevigorousplantgrowth,reducethewater,fertilizerandpesticidesneededtosupportVolume!!—constructionStonnwaterPollutionPrevention-August20124-28- BMPC140:DustControlPurposeDustcontrolpreventswindtransportofdustfromdisturbedsoilsurfacesontoroadways,drainageways,andsurfacewaters.ConditionsofUse•Inareas(includingroadways)subjecttosurfaceandairmovementofdustwhereon-siteandoff-siteimpactstoroadways,drainageways,orsurfacewatersarelikely.Designand•Vegetateormulchareasthatwillnotreceivevehicletraffic.InareasJnstallatio,zwhereplanting,mulching,orpavingisimpractical,applygravelorSpecificationslandscapingrock.•Limitdustgenerationbyclearingonlythoseareaswhereimmediateactivitywilltakeplace,leavingtheremainingarea(s)intheoriginalcondilion.Maintaintheoriginalgroundcoveraslongaspractical.•Constructnaturalorartificialwindbreaksorwindscreens.Thesemaybedesignedasenclosuresforsmalldustsources.•Sprinklethesitewithwateruntilsurfaceiswet.Repeatasneeded,Topreventcanyoutofmudontostreet,refertoStabilizedConstructionEntrance(BMPCl05).•Irrigationwatercanbeusedfordustcontrol.Irrigationsystemsshouldbeinstalledasafirststeponsiteswheredustcontrolisaconcern.•Sprayexposedsoilareaswithadustpalliative,followingthemanufacturer’sinstructionsandcautionsregardinghandlingandapplication.Usedoilisprohibitedfromuseasadustsuppressant.LocalgovernmentsmayapproveotherdustpalliativessuchascalciumchlorideorPAM.•PAM(BMPC126)addedtowateratarateof0.5lbs.per1,000gallonsofwaterperacreandappliedfromawatertruckismoreeffectivethanwateralone.Thisisduetoincreasedinfiltrationofwaterintothesoilandreducedevaporation.Inaddition,smallsoilparticlesarebondedtogetherandarenotaseasilytransportedbywind.AddingPAMmayactuallyreducethequantityofwaterneededfordustcontrol.UseofPAMcouldbeacost-effectivedustcontrolmethod.Techniquesthatcanbeusedforunpavedroadsandlotsinclude:•Lowerspeedlimits.Highvehiclespeedincreasestheamountofduststirredupfromunpavedroadsandlots.•Upgradetheroadsurfacestrengthbyimprovingparticlesize,shape,andmineraltypesthatmakeupthesurfaceandbasematerials.•Addsurfacegraveltoreducethesourceofdustemission.Limittheamountoffineparticles(thosesmallerthan.075mm)to10to20percent.Volume11—Const,-uctionStormwaterPollutionPrevention—August20124-40atdc& •Usegeotextilefabricstoincreasethestrengthofnewroadsorroadsundergoingreconstruction.•Encouragetheuseofalternate,pavedroutes,ifavailable.•Restrictuseofpavedroadwaysbytrackedvehiclesandheavytruckstopreventdamagetoroadsurfaceandbase.•Applychemicaldustsuppressantsusingtheadmixmethod,blendingtheproductwiththetopfewinchesofsurfacematerial.Suppressantsmayalsobeappliedassurfacetreatments.•Paveunpavedpermanentroadsandothertraffickedareas.•Usevacuumstreetsweepers.•Removemudandotherdirtpromptlysoitdoesnotdryandthenturnintodust.•Limitdust-causingworkonwindydays.•ContactyourlocalAirPolltLtionControlAuthorityforguidanceandtrainingonotherdustcontrolmeasures.CompliancewiththelocalAirPollutionControlAuthorityconstitutescompliancewiththisBMP.MaintenanceResprayareaasnecessarytokeepdusttoaminimum.StandardsBMPC150:MaterialsonHandPurposeKeepquantitiesoferosionpreventionandsedimentcontrolmaterialsontheprojectsiteatalltimestobeusedforregularmaintenanceandemergencysituationssuchasunexpectedheavysummerrains.Havingthesematerialson-sitereducesthetimeneededtoimplementBMPswheninspectionsindicatethatexistingBMPsarenotmeetingtheConstructionSWPPPrequirements.Inaddition,contractorscansavemoneybybuyingsomematerialsinbulkandstoringthemattheirofficeoryard.ConditionsofUse•Constructionprojectsofanysizeortypecanbenefitfromhavingmaterialsonhand.Asmallcommercialdevelopmentprojectcouldhavearollofplasticandsomegravelavailableforimmediateprotectionofbaresoilandtemporarybermconstruction.Alargeearthworkproject,suchashighwayconstruction,mighthaveseveraltonsofstraw,severalrollsofplastic,flexiblepipe,sandbags,geotextilefabricandsteel“T”posts.•Materialsarestockpiledandreadilyavailablebeforeanysiteclearing,grubbing,orearthworkbegins.Alargecontractorordevelopercouldkeepastockpileofmaterialsthatareavailableforuseonseveralprojects.•Ifstoragespaceattheprojectsiteisatapremium,thecontractorcouldmaintainthematerialsattheirofficeoryard.Theofficeoryardmustbelessthananhourfromtheprojectsite.VolumeII—constructionStonuwaterPollutionPrevention—August20124-41n’ DesignandDependingonprojecttype,size,complexity,andlength,materialsandInstallationquantitieswillvary.AgoodminimumlistofitemsthatwillcoverSpecificationsnumeroussituationsincludes:______MaterialClearPlastic,6muDrainpipe,6or8inchdiameterSandba&s,filled_______StrawBalesformulching1—_______QuarrySpallsWashedGravel________________GeotextileFabric________________CatchBasinTnserts_____________—Steel“T”Posts_______________Siltfencematerial_____________StrawWattlesMaintenance•Allmaterialswiththeexceptionofthequarryspalls,steel“T”posts,Standardsandgravelshouldbekeptcoveredandoutofbothsunandrain.•Re-stockmaterialsusedasneeded.Volume!!—ConstructionStonnwaterPollutionPrevention—August20124-42 BMPC200:InterceptorDikeandSwaleProvidearidgeofcompactedsoil,oraridgewithanupslopeswale,atthetoporbaseofadisturbedslopeoralongtheperimeterofadisturbedconstructionareatoconveystormwater.Usethedikeand/orswaletointercepttherunofffromunprotectedareasanddirectittoareaswhereerosioncanbecontrolled.Thiscanpreventstormrunofffromenteringtheworkareaorsediment-ladenrunofffromleavingtheconstructionsite.ConditionsofUseWheretherunofffromanexposedsiteordisturbedslopemustbeconveyedtoanerosioncontrolfacilitywhichcansafelyconveythestormwater.•Locateupslopeofaconstructionsitetopreventrunofffromenteringdisturbedarea.•Whenplacedhorizontallyacrossadisturbedslope,itreducestheamountandvelocityofrunoffflowingdowntheslope.•Locatedownslopetocollectrunofffromadisturbedareaanddirectwatertoasedimentbasin.•Dikeand/orswaleandchannelmustbestabilizedwithtemporaryorpermanentvegetationorotherchannelprotectionduringconstruction.•Channelrequiresapositivegradefordrainage;steepergradesrequirechannelprotectionandcheckdams.•Reviewconstructionforareaswhereovertoppingmayoccur.•Canbeusedattopofnewfillbeforevegetationisestablished.•Maybeusedasapermanentdiversionchanneltocarrytherunoff.•Sub-basintributaryareashouldbeoneacreorless.•Designcapacityforthepeakflowfroma10-year,24-hourstorm,assumingaTypeIArainfalldistribution,fortemporaryfacilities.Alternatively,use1.6timesthe10-year,1-hourflowindicatedbyanapprovedcontinuousrunoffmodel.Forfacilitiesthatwillalsoserveonapermanentbasis,consultthelocalgovernment’sdrainagerequirements.Interceptordikesshallmeetthefollowingcriteria:2feetminimum.1.5feetminimumonberm.2H:IVorflatter.Dependsontopography,however,dikesystemminimumis0.5%,andmaximumis1%.Minimumof90percentASTMD698standardproctor.Volume11—ConstructionStornnvaterPollutionPrevention-August20124-57——4’.‘.heC’’PurposeDesignandInstallationSpecificationsTopWidthHeightSideSlopeGradeCompaction HorizontalSpacingofInterceptorDikes:AverageSlopeSlopePercentFlowpathLength20H:IVorless3-5%300feet(lOto2O)H:lV5-10%200feet(4to10)H:IV10-25%100feet(2to4)14:IV25-50%50feetStabilizationdependsonvelocityandreachSlopes<5%Seedandmulchappliedwithin5daysofdikeconstruction(seeBMPC121,Mulching).Slopes5-40%Dependentonrunoffvelocitiesanddikematerials.Stabilizationshouldbedoneimmediatelyusingeithersodorripraporothermeasurestoavoiderosion.Theupsiopesideofthedikeshallprovidepositivedrainagetothedikeoutlet.Noerosionshalloccurattheoutlet.Provideenergydissipationmeasuresasnecessary.Sediment-ladenrunoffmustbereleasedthroughasedimenttrappingfacility.Minimizeconstructiontrafficovertemporarydikes.Usetemporarycrossculvertsforchannelcrossing.Interceptorswalcsshallmeetthefollowingcriteria:BottomWidth2feetminimum;thecross-sectionbottomshallbelevel.Depth1-footminimum.SideSlope211:IVorflatter.GradeMaximum5percent,withpositivedrainagetoasuitableoutlet(suchasasedimentpond).StabilizationSeedasperBMPCl20,TemporaryandPermanentSeeding,orB/VPC202,ChannelLining,12inchesthickHprappressedintothebankandextendingatleast8inchesverticalfromthebottom.Inspectdiversiondikesandinterceptorswalesonceaweekandaftereveryrainfall.Immediatelyremovesedimentfromtheflowarea.Damagecausedbyconstructiontrafficorotheractivitymustberepairedbeforetheendofeachworkingday.Checkoutletsandmaketimelyrepairsasneededtoavoidgullyformation.Whentheareabelowthetemporan’diversiondikeispermanentlystabilized,removethedikeandfillandstabilizethechanneltoblendwiththenaturalsurface..Volume!!—ConstructionStonnwaterPollutionPrevention—August20124-58-SL;>‘Qaçr BMPC202:ChannelLiningPurposeToprotectchannelsbyprovidingachannellinerusingeitherblanketsorriprap.ConditionsofWhennaturalsoilsorvegetatedstabilizedsoilsinachannelarenotadequatiUsetopreventchannelerosion.•Whenapermanentditchorpipesystemistobeinstalledandatemporarymeasureisneeded.•Inalmostallcases,syntheticandorganiccoconutblanketsaremoreeffectivethanriprapforprotectingchannelsfromerosion.Blanketscanbeusedwithandwithoutvegetation.Blanketedchannelscanbedesignedtohandleanyexpectedflowandlongevityrequirement.Somesyntheticblanketshaveapredictedlifespanof50yearsormore,eveninsunlight.•Otherreasonswhyblanketsarebetterthanrockincludetheavailabilityofblanketsoverrock.Inmanyareasofthestate,rockisnoteasilyobtainableorisveryexpensivetohaultoasite.Blanketscanbedeliveredanywhere.Rockrequirestheuseofdumptruckstohaulandheavyequipmenttoplace.Blanketsusuallyonlyrequirelaborerswithhandtools,andsometimesabackhoe.•TheFederalHighwayAdministrationrecommendsnotusingflexiblelinerswhenevertheslopeexceeds10percentortheshearstressexceeds8lbs/ft2.DesignandSeeBMPCl22forinformationonblankets.installation....Sincenprapisusedwhereerosionpotentialishigh,constructionmustbeSpecificationssequencedsothattheriprapisputinplacewiththeminimumpossibledelay.•Disturbanceofareaswhereriprapistobeplacedshouldbeundertakenonlywhenfinalpreparationandplacementoftheriprapcanfollowimmediatelybehindtheinitialdisturbance.Whereriprapisusedforoutletprotection,theriprapshouldbeplacedbeforeorinconjunctionwiththeconstructionofthepipeorchannelsothatitisinplacewhenthepipeorchannelbeginstooperate.•Thedesigner,afterdeterminingtheriprapsizethatwiLlbestableundertheflowconditions,shallconsiderthatsizetobeaminimumsizeandthen,basedonriprapgradationsactuallyavailableinthearea,selectthesizeorsizesthatequalorexceedtheminimumsize.Thepossibilityofdrainagestructuredamagebychildrenshallbeconsideredinselectingariprapsize,especiallyifthereisnearbywateroragullyinwhichtotossthestones.•Stoneforriprapshallconsistoffieldstoneorquarrystoneofapproximatelyrectangularshape.ThestoneshallbehardandangularVohune11—ConstructionStormwaterPollutionPrevention—August20124-63I BMPC203:WaterBarsandofsuchqualitythatitwillnotdisintegrateonexposuretowaterorweatheringanditshallbesuitableinallrespectsforthepurposeintended.Aliningofengineeringfilterfabric(geotextile)shallbeplacedbetweentheriprapandtheunderlyingsoilsurfacetopreventsoilmovementintoorthroughtheriprap.Thegeotextileshouldbekeyedinatthetopofthebank.Filterfabricshallnotbeusedonslopesgreaterthan1-l/2H:1Vasslippagemayoccur.Itshouldbeusedinconjunctionwithalayerofcoarseaggregate(granularfilterblanket)whentheripraptobeplacedis12inchesandlarger.PurposeConditionsofuseDesignandInstallationSpecificationsAsmallditchorridgeofmaterialisconstructeddiagonallyacrossaroadorright-of-waytodivertstormwaterrunofffromtheroadsurface,wheeltracks,orashallowroadditch.SeeFiaure4.2.3.Clearingright-of-wayandconstructionofaccessforpowerlines,pipelines,andothersimilarinstallationsoftenrequirelongnarrowright-of-waysoverslopingterrain.Disturbanceandcompactionpromotesgullyformationintheseclearedstripsbyincreasingthevolumeandvelocityofrunoff.Gullyformationmaybeespeciallysevereintiretracksandruts.Topreventgullying,runoffcanoftendivertedacrossthewidthoftheright-of-waytoundisturbedareasbyusingsmallpredesigneddiversions.•Givespecialconsiderationtoeachindividualoutletarea,aswellastothecumulativeeffectofaddeddiversions.Usegraveltostabilizethediversionwheresignificantvehiculartrafficisanticipated.Height:8-inchminimummeasuredfromthechannelbottomtotheridgetop.•Sideslopeofchannel:2H:IVmaximum;3H:IVorflatterwhenvehicleswillcross.Basewidthofridge:6-inchminimum.•Locatethemtousenaturaldrainagesystemsandvegetatedstableareas.todischargeintowellGuidelineforSpacing:>35UserocklinedditchVa/june!!—ConstructionStormwaterPollutionPrevention—August20124-64.Slope%Spacing(ft)<51255-1010010-207520-3550 BMPC207:CheckDamsPurposeConstructionofsmalldamsacrossaswaleorditchreducesthevelocityofconcentratedflowanddissipatesenergyatthecheckdam.ConditionsofUseWheretemporarychannelsorpermanentchannelsarenotyetvegetated,channelliningisinfeasible,and/orvelocitychecksarerequired.CheckdamsmaynotbeplacedinstreamsunlessapprovedbytheStateDepartmentofFishandWildlife.Checkdamsmaynotbeplacedinwetlandswithoutapprovalfromapermittingagency.•DonotplacecheckdamsbelowtheexpectedbackwaterfromanysalmonidbearingwaterbetweenOctober1andMay31toensurethatthereisnolossofhighflowreftgehabitatforoverwinteringjuvenilesalmonidsandemergentsalmonidfry.•Constructrockcheckdamsfromappropriatelysizedrock.Therockusedmustbelargeenoughtostayinplacegiventheexpecteddesignflowthroughthechannel.Therockmustbeplacedbyhandorbymechanicalmeans(nodumpingofrocktoformdam)toachievecompletecoverageoftheditchorswaleandtoensurethatthecenterofthedamislowerthantheedges.•Checkdamsmayalsobeconstructedofeitherrockorpea-gravelfilledbags.Numerousnewproductsarealsoavailableforthispurpose.Theytendtobere-usable,quickandeasytoinstall,effective,andcostefficient.•Placecheckdamsperpendiculartotheflowofwater.•Thedamshouldformatrianglewhenviewedfromtheside.Thispreventsundercuttingaswaterflowsoverthefaceofthedamratherthanfallingdirectlyontotheditchbottom.VohuneII—ConstructionStonnwaterPollutionPrevention—August20124-73Treated2x10”maybeabulledendtoSpreadermustbelevelendformax,spreaderlengthof506”mm.1miIA-[-Ir11Ii---I1&mm.rebarsupporls8max.spacingFigure4.2.6—DetailofLevelSpreader •Beforeinstallingcheckdamsimpoundandbypassupstreamwaterflowawayfromtheworkarea.Optionsforbypassingincludepumps,siphons,ortemporarychannels.•Checkdamsinassociationwithsumpsworkmoreeffectivelyatslowingflowandretainingsedimentthanjustacheckdamalone.Adeepsumpshouldbeprovidedimmediatelyupstreamofthecheckdam.•Insomecases,ifcarefrillylocatedanddesigned,checkdamscanremainaspermanentinstallationswithveryminorregrading.Theymaybeleftaseitherspillways,inwhichcaseaccumulatedsedimentwouldbegradedandseeded,orascheckdamstopreventfurthersedimentfromleavingthesite.•Themaximumspacingbetweenthedamsshallbesuchthatthetoeoftheupstreamdamisatthesameelevationasthetopofthedownstreamdam.•Keepthemaximumheightat2feetatthecenterofthedam.•Keepthecenterofthecheckdamatleast12incheslowerthantheouteredgesatnaturalgroundelevation.•Keepthesideslopesofthecheckdamat214:IVorflatter.•Keythestoneintotheditchbanksandextenditbeyondtheabutmentsaminimumof18inchestoavoidwashoutsfromoverflowaroundthedam.•Usefilterfabricfoundationunderarockorsandbagcheckdam.ifablanketditchlinerisused,filterfabricisnotnecessary.Apieceoforganicorsyntheticblanketcuttofitwillalsoworkforthispurpose.•Inthecaseofgrass-linedditchesandswales,allcheckdamsandaccumulatedsedimentshallberemovedwhenthegrasshasmaturedsufficientlytoprotecttheditchorswale-unlesstheslopeoftheswaleisgreaterthan4percent.Theareabeneaththecheckdamsshallbeseededandmulchedimmediatelyafterdamremoval.•Ensurethatchannelappurtenances,suchasculvertentrancesbelowcheckdams,arenotsubjecttodamageorblockagefromdisplacedstones.Figure4.2.7depictsatypicalrockcheckdam.MaintenanceCheckdamsshallbcmonitoredforperformanceandsedimentStandardsaccumulationduringandaftereachrunoffproducingrainfall.Sedimentshallberemovedwhenitreachesonehalfthesumpdepth.•Anticipatesubmergenceanddepositionabovethecheckdamanderosionfromhighflowsaroundtheedgesofthedam.•Ifsignificanterosionoccursbetweendams,installaprotectiveripraplinerinthatportionofthechannel.VolumeII—ConstructionStormwaterPollutionPrevention—August20124-74-. ApprovedasEquivalentEcologyhasapprovedproductsasabletomeettherequirementsofBMPC207.TheproductsdidnotpassthroughtheTechnologyAssessmentProtocol—Ecology(TAPE)process.Localjurisdictionsmaychoosenottoacceptthisproductapprovedasequivalent,ormayrequireadditionaltestingpriortoconsiderationforlocaluse.TheproductsareavailableforreviewonEcology’swebsiteathttp:!/www.ecy.wa.2ov/prorams!wQ/stormwater/newtech/eguivalent.htmlVolume!!—Co,,structjo,,StorniwaterPollutionPrevention-August20124-75 VolumeII—ConstructionStormwaterPollutionPrevention—August20124-76______AFigure4.2.7—RockCheckDam Standardsaccumulationduringandaftereachrunoffproducingrainfall.Sedimentshallberemovedwhenitreachesonehalftheheightofthedam.Anticipatesubmergenceanddepositionabovethetriangularsiltdamanderosionfromhighflowsaroundtheedgesofthedam.Immediatelyrepairanydamageoranyundercuttingofthedam.BMPC209:OutletProtectionPurposeOutletprotectionpreventsscouratconveyanceoutletsandminimizesthepotentialfordownstreamerosionbyreducingthevelocityofconcentratedstormwaterflows.ConditionsofuseOutletprotectionisrequiredattheoutletsofallponds,pipes,otherconveyances,andwhererunoffisconveyedtoanaturaldrainagefeaturesuchasastream,wetland,lake,orditch.Thereceivingchannelattheoutletofaculvertshallbeprotectedfromerosionbyrockliningaminimumof6feetdownstreamandextendingupthechannelsidesaminimumofI—footabovethemaximumtailwaterelevationorI-footabovethecrown,whicheverishigher.Forlargepipes(morethan18inchesindiameter),theoutletprotectionliningofthechannelislengthenedtofourtimesthediameteroftheculvert.•Standardwingwalls,andtaperedoutletsandpavedchannelsshouldalsobeconsideredwhenappropriateforpermanentculvertoutletprotection.(SeeWSDOTHydraulicManual,availablethroughWSDOTEngineeringPublications).•Organicorsyntheticerosionblankets,withorwithoutvegetation,areusuallymoreeffectivethanrock,cheaper,andeasiertoinstall.Materialscanbechosenusingmanufacturerproductspecifications.ASTN’Itestresultsareavailableformostproductsandthedesignercanchoosethecorrectmaterialfortheexpectedflow.•Withlowflows,vegetation(includingsod)canbeeffective.•Thefollowingguidelinesshallbeusedforriprapoutletprotection:1.Ifthedischargevelocityattheoutletislessthan5fs(pipeslopelessthan1percent),use2-inchto8-inchriprap.Minimumthicknessis1-foot.2.For5to10Thsdischargevelocityattheoutlet(pipeslopelessthan3percent),use24-inchto48-inchriprap.Minimumthicknessis2feet.3.Foroutletsatthebaseofsteepslopepipes(pipeslopegreaterthan10percent),anengineeredenergydissipatershallbeused.•Filterfabricorerosioncontrolblanketsshouldalwaysbeusedunderripraptopreventscourandchannelerosion.VolumeII—ConstructionStormwaterPollutionPrevention-August20124-78CDesignandInstallationSpecificationsditches,orormanmade •Newpipeoutfallscanprovideanopportunityforlow-costfishhabitatimprovements.Forexample,analcoveoflow-velocitywatercanbecreatedbyconstructingthepipeoutfallandassociatedenergydissipaterbackfromthestreamedgeanddiggingachannel,over-widenedtotheupstreamside,fromtheoutfall.Overwinteringjuvenileandmigratingadultsalmonidsmayusethealcoveasshelterduringhighflows.Bankstabilization,bioengineeHng,andhabitatfeaturesmayberequiredfordisturbedareas.ThisworkmayrequireaI-WA.SeeVolumeVformoreinformationonoutfallsystemdesign.Maintenance•Inspectandrepairasneeded.Standards.•Addrockasneededtomaintaintheintendedfunction.•Cleanenergydissipaterifsedimentbuildsup.Voliune11—ConstructionStormwaterPollutionPrevention—August20124-79-________________.. BMPC232:GravelFilterBermPurposeConditionsofUseDesignandInstallationSpecificationsAgravelfilterbemiisconstructedonrights-of-wayortrafficareaswithinaconstructionsitetoretainsedimentbyusingafilterbermofgravelorcrushedrock.Whereatemporarymeasureisneededtoretainsedimentfromrights-of-wayorintrafficareasonconstructionsites.Bermmaterialshallbe3/4to3inchesinsize,washedwell-gradegravelorcrushedrockwithlessthan5percentfines.Spacingofbenris:—Every300feetonslopeslessthan5percent—Every200feetonslopesbetween5percentand10percent—Every100feetonslopesgreaterthan10percentBermdimensions:—1foothighwith3H:IVsideslopesMaintenanceStandards—8linearfeetperIcfsrunoffbasedonthe10-year,24-hourdesignstormRegularinspectionisrequired.Sedimentshallberemovedandfiltermaterialreplacedasneeded.BMPC233:SiltFencePurposeConditionsofUseUseofasiltfencereducesthetransportofcoarsesedimentfromaconstructionsitebyprovidingatemporaryphysicalbarriertosedimentandreducingtherunoffvelocitiesofoverlandflow.SeeFigure4.2.12fordetailsonsiltfenceconstruction.Siltfencemaybeuseddownslopeofalldisturbedareas.•Siltfenceshallpreventsoilcarriedbyrunoffwaterfromgoingbeneath,through,oroverthetopofthesiltfence,butshallallowthewatertopassthroughthefence.•Siltfenceisnotintendedtotreatconcentratedflows,norisitintendedtotreatsubstantialamountsofoverlandflow.Conveyanyconcentratedflowsthroughthedrainagesystemtoasedimentpond.•DonotconstructsiltfencesinstreamsoruseinV-shapedditches.Siltfencesdonotprovideanadequatemethodofsiltcontrolforanythingdeeperthansheetoroverlandflow.Volume!!—ConstructionSronnwaterPollutionPrevention—August20124-88- Jointsinfilterfabricshallbesplicedatposts.Usestaples,wireringsor2”x2’b14Ga.wireorequivalenttoattachfabrictopostsequivaent.ifstandard_ZLihilii]if__strenLhHlerfabhc6max—‘—Minimum4x4’trench.E/Backfilltrenchwithnativesoil/Postspacingmaybeincreasedor3’4”i.5’washedgravelto8’iiwirebackingisused2x2woodposts.steelfenceposts,orequivalentFigure4.2.12—SiltFenceDesignand•UseincombinationwithsedimentbasinsorotherBMPs,Installation•Maximumslopesteepness(normal(perpendicular)tofenceline)Specifications1H:IV.•Maximumsheetoroverlandflowpathlengthtothefenceof100feet.•Donotallowflowsgreaterthan0.5cfs.•Thegeotextileusedshallmeetthefollowingstandards.Allgeotextilepropertieslistedbelowareminimumaveragerollvalues(i.e.,thetestresultforanysampledrollinalotshallmeetorexceedthevaluesshowninTable4.2.3):Table4.2,3GeotextileStandardsPolymericMeshADSTO.ömmax1mmtt’o0eve).0(ASTM1)4751)mmmaximumforallothergeotextiletypes(#50sieve).0.15mmminimumforallfabrictypes(#100sieve).waterPermittivity0.02sec5flnimum—-(ASTMD4491)GrabTensileStrength180lbs.Minimumforextrastrengthfabric.(ASTMD4632}100lbsminimumforstandardstrengthfabric.GrabTensileStrength30%maximum(ASTMD4632)______________UltravioletResistance70%minimum(ASTMD4355)I•Supportstandardstrengthfabricswithwiremesh,chickenwire,2-inchx2-inchwire,safetyfence,orjutemeshtoincreasethestrengthoftheVolume!!—ConstructionStonuwaterPollutionPrevention-August20124-89-fl_Z’ fabric.Siltfencematerialsareavailablethathavesyntheticmeshbackingattached.Filterfabricmaterialshallcontainultravioletrayinhibitorsandstabilizerstoprovideaminimumofsixmonthsofexpectedusableconstructionlifeatatemperaturerangeof0°F.to120°F.One-hundredpercentbiodegradablesiltfenceisavailablethatisstrong,longlasting,andcanbeleftinplaceaftertheprojectiscompleted,ifpermittedbylocalregulations.RefertoFigure4.2.12forstandardsiltfencedetails.IncludethefollowingstandardNotesforsiltfenceonconstructionp’ansandspecifications:1.ThecontractorshallinstallandmaintaintemporarysiltfencesatthelocationsshowninthePlans.2.Constructsiltfencesinareasofclearing,grading,ordrainagepriortostartingthoseactivities.3.Thesiltfenceshallhavea2-feetmm.anda2V2-feetmax.heightabovetheoriginalgroundsurface.4.Thefilterfabricshallbesewntogetheratthepointofmanufacturetoformfilterfabriclengthsasrequired.Locateallsewnseamsatsupportposts.Alternatively,twosectionsofsiltfencecanbeoverlapped,providedtheContractorcandemonstrate,tothesatisfactionoftheEngineer,thattheoverlapislongenoughandthattheadjacentfencesectionsarecloseenoughtogethertopreventsiltladenwaterfromescapingthroughthefenceattheoverlap.5.Attachthefilterfabricontheup-slopesideofthepostsandsecurewithstaples,wire,orinaccordancewiththemanufacturersrecommendations.Attachthefilterfabrictothepostsinamannerthatreducesthepotentialfortearing.6.Supportthefilterfabricwithwireorplasticmesh,dependentonthepropertiesofthegeotextileselectedforuse.Ifwireorplasticmeshisused,fastenthemeshsecurelytotheup-slopesideofthepostswiththefilterfabricup-slopeofthemesh.7.Meshsupport,ifused,shallconsistofsteelwirewithamaximummeshspacingof2-inches,oraprefabricatedpolymericmesh.Thestrengthofthewireorpolymericmeshshallbeequivalenttoorgreaterthan180lbs.grabtensilestrength.Thepolymericmeshmustbeasresistanttothesamelevelofultravioletradiationasthefilterfabricitsupports.8.Burythebottomofthefilterfabric4-inchesmm.belowthegroundsurface.Backfillandtampsoilinplaceovertheburiedportionofthefilterfabric,sothatnoflowcanpassbeneaththefenceandVolumeii—constructionStonnwaterPollutionPrevention—August20124-90 scouringcannotoccur.Whenwireorpolymericback-upsupportmeshisused,Ihewireorpolymericmeshshallextendintotheground3-inchesmm.9.Driveorplacethefencepostsintotheground18-inchesmm.A12—inchmm.depthisallowediftopsoilorothersoftsubgradesoilisnotpresentand18-inchescannotbereached.Increasefencepostmm.depthsby6inchesifthefenceislocatedonslopesof3H:IVorsteeperandtheslopeisperpendiculartothefence.Ifrequiredpostdepthscannotbeobtained,thepostsshallbeadequatelysecuredbybracingorguyingtopreventoverwmingofthefenceduetosedimentloading.10.Usewood,steelorequivalentposts.Thespacingofthesupportpostsshallbeamaximumof6-feet.Postsshallconsistofeither:•Woodwithdimensionsof2-inchesby2-incheswidemm.anda3-feetmm.length.Woodpostsshallbefreeofdefectssuchasknots,splits,orgouges.•No.6steelrebarorlarger.•ASTMA120steelpipewithaminimumdiameterof1-inch.•U,T,L,orCshapesteelpostswithaminimumweightof1.35lbs./ft.•Othersteelpostshavingequivalentstrengthandbendingresistancetothepostsizeslistedabove.11.Locatesiltfencesoncontourasmuchaspossible,exceptattheendsofthefence,wherethefenceshallbeturneduphillsuchthatthesiltfencecapturestherunoffwaterandpreventswaterfromflowingaroundtheendofthefence.12.Ifthefencemustcrosscontours,withtheexceptionoftheendsofthefence,placegravelcheckdamsperpendiculartothebackofthefencetominimizeconcentratedflowanderosion.Theslopeofthefencelinewherecontoursmustbecrossedshallnotbesteeperthan3H:IV.•GravelcheckdamsshallbeapproximatelyI-footdeepatthebackofthefence.Gravelcheckdamsshallbecontinuedperpendiculartothefenceatthesameelevationuntilthetopofthecheckdaminterceptsthegroundsurfacebehindthefence.•Gravelcheckdamsshaltconsistofcrushedsurfacingbasecourse,gravelbackfillforwalls,orshoulderballast.Gravelcheckdamsshallbelocatedevery10feetalongthefencewherethefencemustcrosscontours.RefertoFigure4.2.13forslicingmcthoddetails.Siltfenceinstallationusingtheslicingmethodspecifications:Vohune11—ConstructionStonnwaterPollutionPrevention—August20124-91________iiiiatat 1.Thebaseofbothendpostsmustbeatleast2-to4-inchesabovethetopofthefilterfabriconthemiddlepostsforditchcheckstodrainproperly.Useahandlevelorstringlevel,ifnecessary,tomarkbasepointsbeforeinstallation.2.Installposts3-to4-feetapartincriticalretentionareasand6-to7-feetapartinstandardapplications.3.Installposts24-inchesdeeponthedownstreamsideofthesiltfence,andascloseaspossibletothefilterfabric,enablingpoststosupportthefilterfabricfromupstreamwaterpressure.4.Installpostswiththenipplesfacingawayfromthefilterfabric.5.Attachthefilterfabrictoeachpostwiththreeties,allspacedwithinthetop8-inchesofthefilterfabric.Attacheachtiediagonally45degreesthroughthefilterfabric,witheachpunctureatleastI-inchverticallyapart.Eachtieshouldbepositionedtohangonapostnipplewhentighteningtopreventsagging.6.Wrapapproximately6-inchesoffabricaroundtheendpostsandsecurewith3ties.7.Nomorethan24-inchesofa36-inchfilterfabricisallowedabovegroundlevel.Compactthesoilimmediatelynexttothefilterfabricwiththefrontwheelofthetractor,skidsteer,orrollerexertingatleast60poundspersquareinch.Compacttheupstreamsidefirstandtheneachsidetwiceforatotaloffourtrips.Checkandcorrectthesiltfenceinstallationforanydeviationbeforecompaction.Useaflat-bladedshoveltotuckfabricdeeperintothegroundifnecessary.VOILOnCII—ConstructionStormwaterPollutionPrevention—August20124-92 •Repairanydamageimmediately.Standards•Interceptandconveyallevidentconcentratedflowsuphillofthesiltfencetoasedimentpond.•Checktheuphillsideofthefenceforsignsofthefencecloggingandactingasabarriertoflowandthencausingchannclizationofflowsparalleltothefence.Tfthisoccurs,replacethefenceorremovethetrappedsediment..VohuneII—ConstructionStonnwaterPollutionPrevention—August20)24-93JfrfaintenanceFigure4.2.13—SiltFenceInstallationbySlicingMethod •Removesedimentdepositswhenthedepositreachesapproximatelyone-thirdtheheightofthesiltfence,orinstallasecondsiltfence.•Replacefilterfabricthathasdeterioratedduetoultravioletbreakdown.BMPC234:VegetatedStripPurposeConditionsofUseDesignandInstallationSpecificationsVegetatedstripsreducethetransportofcoarsesedimentfromaconstructionsitebyprovidingatemporaryphysicalbarriertosedimentandreducingtherunoffvelocitiesofoverlandflow.•Vegetatedstripsmaybeuseddownslopeofalldisturbedareas.•Vegetatedstripsarenotintendedtotreatconcentratedflows,noraretheyintendedtotreatsubstantialamountsofoverlandflow.Anyconcentratedflowsmustbeconveyedthroughthedrainagesystemtoasedimentpond.Theonlycircumstanceinwhichoverlandflowcanbetreatedsolelybyastrip,ratherthanbyasedimentpond,iswhenthefollowingcriteriaaremet(seeTable4.2.4):Table4.2.4ContributingDrainageAreaforVegetatedStripsAverageContributingAverageContributingareaIMaxContributingareaSlopePercentSlopeareaElowpathLengthI.5H:IVorflatter67%orflatter100feet21-1:IVorflatter50%orflatter115feet41-I:IVorflatter25%orflatter150feet-6H:IVorflatter-—16.7%orflatter200feetIOH:IVorflatter10%orflatter250feet•Thevegetatedstripshallconsistofaminimumofa25-footflowpathlengthcontinuousstripofdensevegetationwithtopsoil.Grass-covered,landscapedareasaregenerallynotadequatebecausethevolumeofsedimentoverwhelmsthegrass.Ideally,vegetatedstripsshallconsistofundisturbednativegrowthwithawell-developedsoilthatallowsforinfiltrationofrunoff.•Theslopewithinthestripshallnotexceed4H:IV.A4aintenanceStandards•Theuphillboundaryofthevegetatedstripshallbedelineatedwithclearinglimits.•Anyareasdamagedbyerosionorconstructionactivityshallbeseededimmediatelyandprotectedbymulch.•Ifmorethan5feetoftheoriginalvegetatedstripwidthhashadvegetationremovedorisbeingeroded,sodmustbeinstalled.•Ifthereareindicationsthatconcentratedflowsaretravelingacrossthebuffer,surfacewatercontrolsmustbeinstalledtoreducetheflowsVolume!!—ConstructionStormwaterPollutionPrevention—August20124-94a,.’-t., enteringthebuffer,oradditionalperimeterprotectionmustbeinstalled.BMPC235:WattlesPurposeWattlesaretemporaryerosionandsedimentcontrolbarriersconsistingofstraw,compost,orothermaterialthatiswrappedinbiodegradabletubularplasticorsimilarencasingmaterial.TheyreducethevelocityandcanspreadtheflowofnIlandsheetrunoff,andcancaptureandretainsediment.Wattlesaretypically8to10inchesindiameterand25to30feetinlength.Wattlesareplacedinshallowtrenchesandstakedalongthecontourofdisturbedornewlyconstructedslopes.SeeFigure4.2.14fortypicalconstructiondetails.WSDOTStandardPlan1-30.30-00alsoprovidesinformationonWattles(http://www.wsdot.wa.gov/Design/Standards/Plans.htm#Scctionl)ConditionsofUse•Usewattles:•Indisturbedareasthatrequireimmediateerosionprotection.•Onexposedsoilsduringtheperiodofshortconstructiondelays,oroverwintermonths.•Onslopesrequiringstabilizationuntilpermanentvegetationcanbeestablished.•Thematerialuseddictatestheeffectivenessperiodofthewattle.Generally,Wattlesaretypicallyeffectiveforonetotwoseasons.•Preventrillingbeneathwattlesbyproperlyentrenchingandabuttingwattlestogethertopreventwaterfrompassingbetweenthem.DesignCriteria•Installwattlesperpendiculartotheflowdirectionandparalleltotheslopecontour.•Narrowtrenchesshouldbedugacrosstheslopeoncontourtoadepthof3-to5-inchesonclaysoilsandsoilswithgradualslopes.Onloosesoils,steepslopes,andareaswithhighrainfall,thetrenchesshouldbedugtoadepthof5-to7-inches,or1/2to2/3ofthethicknessofthewattle.•Startbuildingtrenchesandinstallingwattlesfromthebaseoftheslopeandworkup.Spreadexcavatedmaterialevenlyalongtheuphillslopeandcompactedusinghandtampingorothermethods.•Constructtrenchesatintervalsof10-to25-feetdependingonthesteepnessoftheslope,soiltype,andrainfall.Thesteepertheslopetheclosertogetherthetrenches.•Installthewafflessnuglyintothetrenchesandabuttightlyendtoend.Donotoverlaptheends.•installstakesateachendofthewattle,andat4-footcentersalongentirelengthofwattle.Volume11—ConstructionStormwaterPollutionPrevention—August20124-95 Mai,,te,,a,,ceStandards•Ifrequired,installpilotholesforthestakesusingastraightbartodriveholesthroughthewattleandintothesoil.•Woodenstakesshouldbeapproximately3/4x3/4x24inchesmm.Willowcuttingsor3/8-inchrebarcanalsobeusedforstakes.•Stakesshouldbedriventhroughthemiddleofthewattle,leaving2to3inchesofthestakeprotrudingabovethewattle.•Wattlesmayrequiremaintenancetoensuretheyareincontactwithsoilandthoroughlyentrenched,especiallyaftersignificantrainfallonsteepsandysoils.Vohune11—ConstructionSror,nivaterPollutionPrevention—August20124-96C 3,4,StrawRollsMustBePlacedAlongSlopeContours‘N/3-5’(75-125mm)/2\*\\_//—---‘v:-—/-\-‘71”Xl”Stake(25x25mm)10’01k(200-250mm)Figure4.2.14—WattlesVolumeII—ConstructionStormwaterPollutionPrevention—August2012.S/SN/10-25(3-Sm)/SedHnent,oranlcmatter,andnativeseedsarecapturedbehindtherolls.SpacingDependsonSoilTypeandSiopeSteepnessLiveStakenottoscaleNOTE:I.Strawroilinstallationrequirestheplacementandsecurestakingoftherollinatrench,3-5”(75-125mm)deep,dugoncontour.runoffmustnutbeallowedtonounderoraroundroll.4-97 .ApprovedasEquivalent•Inspecttheslopeaftersignificantstormsandrepairanyareaswherewattlesarenottightlyabuttedorwaterhasscouredbeneaththewattles.EcologyhasapprovedproductsasabletomeettherequirementsofBMP035.TheproductsdidnotpassthroughtheTechnologyAssessmentProtocol—Ecology(TAPE)process.Localjurisdictionsmaychoosenottoacceptthisproductapprovedasequivalent,ormayrequireadditionaltestingpriortoconsiderationforlocaluse.TheproductsareavailableforreviewonEcology’swebsiteathttp://www.ecy.wa.gov/programs/wg/stormwater/newtcch/eguivalent.htmlBMPC236:VegetativeFiltrationPurposeConditio,,sofUseVegetativeFiltrationmaybeusedinconjunctionwithBMPC24ITemporan’SedimentPonds,BMPC206LevelSpreaderandapumpingsystemwithsurfaceintaketoimproveturbiditylevelsofstormwaterdischargesbyfilteringthroughexistingvegetationwhereundisturbedforestfloordufflayerorestablishedlawnwiththatchlayerarepresent.VegetativeFiltrationcanalsobeusedtoinfiltratedewatedngwastefromfoundations,vaults,andtrenchesaslongasrunoffdoesnotoccur.•Foreveryfiveacreofdisturbedsoiluseoneacreofgrassfield,farmpasture,orwoodedarea.Reduceorincreasethisareadependingonprojectsize,groundwatertableheight,andothersiteconditions.•Wetlandsshallnotbeusedforfiltration.DesignCriteria•DonotusethisBMPinareaswithahighgroundwatertable,orinareasthatwillhaveahighseasonalgroundwatertableduringtheuseofthisBMP.•ThisBMPmaybelesseffectiveonsoilsthatpreventtheinfiltrationofthewater,suchashardtill.•UsingothereffectivesourcecontrolmeasuresthroughoutaconstructionsitewillpreventthegenerationofadditionalhighlyturbidwaterandmayreducethetimeperiodorareaneedforthisBMP.•Stopdistributingwaterintothevegetatedareaifstandingwaterorerosionresults.•Findlandadjacenttotheprojectthathasavegetatedfield,preferablyafarmfield,orwoodedarea.•Iftheprojectsitedoesnotcontainenoughvegetatedfieldareaconsiderobtainingpermissionfromadjacentlandowners(especiallyforfarmfields).•Installapumpanddownstreamdistributionmanifolddependingontheprojectsize.Generally,themaindistributionlineshouldreach100to200-feetlong(manylargeprojects,orprojectsontightsoil,willVoluneII—ConstructionStonuwaterPollutionPrevention—August20124-98tr____ _ ___ _ _ BMPC240:SedimentTrapPurposeAsedimenttrapisasmalltemporarypondingareawithagraveloutletusedtocollectandstoresedimentfromsitesclearedand/orgradedduringconstruction.Sedimenttraps,alongwithotherperimetercontrols,shallbeinstalledbeforeanylanddisturbancetakesplaceinthedrainagearea.JoudirioirsofUsePriortoleavingaconstructionsite,stormwaterrunoffmustpassthroughasedimentpondortraporotherappropriatesedimentremovalbestmanagementpractice.Non-engineeredsedimenttrapsmaybeusedon-sitepriortoanengineeredsedimenttraporsedimentpondtoprovideadditionalsedimentremovalcapacity.Itisintendedforuseonsiteswherethetributarydrainageareaislessthan3acres,withnounusualdrainagefeatures,andaprojectedbuild-outtimeofsixmonthsorless.Thesedimenttrapisatemporarymeasure(withadesignlifeofapproximately6months)andshallbemaintaineduntilthesiteareaispermanentlyprotectedagainsterosionbyvegetationand/orstructures.Sedimenttrapsandpondsareonlyeffectiveinremovingsedimentdowntoaboutthemediumsiltsizefraction.Runoffwithsedimentoffinergrades(linesiltandclay)willpassthroughuntreated,emphasizingtheneedtocontrolerosiontothemaximumextentfirst.Wheneverpossible,sediment-ladenwatershallbedischargedintoon-site,relativelylevel,vegetatedareas(seeBMPC234—VegetatedStrip).Thisistheonlywaytoeffectivelyremovefineparticlesfromrunoffunlesschemicaltreatmentorfiltrationisused.Thiscanbeparticularlyusefulafterinitialtreatmentinasedimenttraporpond.Theareasofreleasemustbeevaluatedonasite-by-sitebasisinordertodetermineappropriatelocationsforandmethodsofreleasingrunoff.Vegetatedwetlandsshallnotbeusedforthispurpose.Frequently,itmaybepossibletopumpwaterfromthecollectionpointatthedownhillendofthesitetoanupslopevegetatedarea.Pumpingshallonlyaugmentthetreatmentsystem,notreplaceit,becauseofthepossibilityofpumpfailureorrunoffvolumeinexcessofpumpcapacity.Allprojectsthatareconstructingpermanentfacilitiesforrunoffquantitycontrolshouldusetherough-gradedorfinal-gradedpermanentfacilitiesfortrapsandponds.Thisincludescombinedfacilitiesandinfiltrationfacilities.Whenpermanentfacilitiesareusedastemporarysedimentationfacilities,thesurfacearearequirementofasedimenttraporpondmustbemet.Ifthesurfacearearequirementsarelargerthanthesurfaceareaofthepermanentfacility,thenthetraporpondshallbeenlargedtocomplywiththesurfacearearequirement.Thepermanentpondshallalsobedividedintotwocellsasrequiredforsedimentponds.Vohune11—ConstructionStonnwaterPollutionPrevention—August20124-101—a--—-—-- Eitherapermanentcontrolstructureorthetemporary’controlstructure(describedinBMPC241,TemporarySedimentPond)canbeused.Ifapermanentcontrolstructureisused,itmaybeadvisabletopartiallyrestrictthelowerorificewithgraveltoincreaseresidencetimewhilestillallowingdewateringofthepond.Ashut-offvalvemaybeaddedtothecontrolstructuretoallowcompleteretentionofstormwaterinemergencysituations.Inthiscase,anemergencyoverflowweirmustbeadded.AskimmermaybeusedforthesedimenttrapoutletifapprovedbytheLocalPermittingAuthority.Designand•SeeFigures4.2.16and4.2.17fordetails.I,zstallatjon•Ifpermanentrunoffcontrolfacilitiesarepartoftheproject,theySpecificationsshouldbeusedforsedimentretention.•Todeterminethesedimenttrapgeometry,firstcalculatethedesignsurfacearea(SA)ofthetrap,measuredattheinvertoftheweir.Usethefollowingequation:SA=FS(Q21V5)whereQ2=Designinflowbasedonthepeakdischargefromthedeveloped2-yearrunoffeventfromthecontributingdrainageareaascomputedinthehydrologicanalysis.The10-yearpeakflowshallbeusediftheprojectsize,expectedtiminganddurationofconstruction,ordownstreamconditionswarrantahigherlevelofprotection.Ifnohydrologicanalysisisrequired,theRationalMethodmaybeused.=Thesettlingvelocityofthesoilparticleofinterest.The0.02mm(mediumsilt)particlewithanassumeddensityof2.65g/cm3hasbeenselectedastheparticleofinterestandhasasettlingvelocity(V5)of0.00096ftlsec.FS=Asafetyfactorof2toaccountfornon-idealsettling.Therefore,theequationforcomputingsurfaceareabecomes:SA=2xQ2/0.00096or2080squarefeetpercfsofinflowNote:Evenifpermanentfacilitiesareused,theymuststillhaveasurfaceareathatisatleastaslargeasthatderivedfromtheaboveformula.Iftheydonot,thepondmustbeenlarged.•Toaidindeterminingsedimentdepth,allsedimenttrapsshallhaveastaffgaugewithaprominentmarkI-footabovethebottomofthetrap.Volume11—ConstructionStormwaterPollutionPrevention—August20124-102-daflflL__ _ __ •Sedimenttrapsmaynotbefeasibleonutilityprojectsduetothelimitedworkspaceortheshort-termnatureofthework.Portabletanksmaybeusedinplaceofsedimenttrapsforutilityprojects.tilainrenanceStandards•Sedimentshallberemovedfromthetrapwhenitreaches1-footindepth.Anydamagetothepondembankmentsorslopesshallberepaired.Figure4.2.16—CrossSectionofSedimentTrapFigure4.2.17—SedimentTrapOutletVolumeII—ConstructionStonnwaterPollutionPrevention—August2012NSurfaceareadeterminedattopofweir\743515141[_4VMin.11’Mm.I1.5’Mm.____FlatsottomINote:TrapmaybeformedbybermorbypartialorcompleteexcavationOverflow1’Mm.I’.’-15”WashedgravelGeotextiloDischargetostabilizedconveyance,outlet,orlevelspreader6Mm.——91MndepthoverflowsplllwayI1I11I11I IrI[[.Pir—IIIIIIriI11II:Nativesoilor........JLMm.1’depthcompactedbackfillF’1I2-4rockElll‘ImjI=lIEI’IEEMm1depth3/4-15”GeotextileiIF’FlIFlI,IIFIIIIHIIF’washedgravel4-103 BMPC241:TemporarySedimentPondPurposeSedimentpondsremovesedimentfromrunofforiginatingfromdisturbedareasofthesite.Sedimentpondsaretypicallydesignedtoremovesedimentnosmallerthanmediumsilt(0.02mm).Consequently,theyusuallyreduceturbidityonlyslightly.C’ondidonsofUsePriortoleavingaconstructionsite,stormwaterrunoffmustpassthroughasedimentpondorotherappropriatesedimentremovalbestmanagementpractice.Asedimentpondshallbeusedwherethecontributingdrainageareais3acresormore.Pondsmustbeusedinconjunctionwitherosioncontrolpracticestoreducetheamountofsedimentflowingintothebasin.Sedimentbasinsmustbeinstalledonlyonsiteswherefailureofthestructurewouldnotresultinlossoflife,damagetohomesorbuildings,orinterruptionofuseorserviceofpublicroadsorutilities.Also,sedimenttrapsandpondsareattractivetochildrenandcanbeverydangerous.Compliancewithlocalordinancesregardinghealthandsafetymustbeaddressed.Iffencingofthepondisrequired,thetypeoffenceanditslocationshallbeshownontheESCplan.•Structureshavingamaximumstoragecapacityatthetopofthedamof10acre-ft(435,600if3)ormorearesubjecttotheWashingtonDamSafetyRegulations(Chapter173-175WAC).•SeeFiQures4.2.18,4.2.19,and4.2.20fordetails.•Ifpermanentrunoffcontrolfacilitiesarepartoftheproject,theyshouldbeusedforsedimentretention.Thesurfacearearequirementsofthesedimentbasinmustbemet.Thismayrequiretemporarilyenlargingthepermanentbasintocomplywiththesurfacearearequirements.Thepem-tanentcontrolstructuremustbetemporarilyreplacedwithacontrolstructurethatonlyallowswatertoleavethepondfromthesurfaceorbypumping.Thepermanentcontrolstructuremustbeinstalledafterthesiteisfullystabilized.•Useofinfiltrationfacilitiesforsedimentationbasinsduringconstructiontendstoclogthesoilsandreducetheircapacitytoinfiltrate.Ifinfiltrationfacilitiesaretobeused,thesidesandbottomofthefacilitymustonlyberoughexcavatedtoaminimumof2feetabovefinalgrade.Finalgradingoftheinfiltrationfacilityshalloccuronlywhenallcontributingdrainageareasarefullystabilized.TheinfiltrationpretreatmentfacilityshouldbethIlyconstructedandusedwiththesedimentationbasintohelppreventclogging.•DeterminingPondGeometryObtainthedischargefromthehydrologiccalculationsofthepeakflowforthe2-yearrunoffevent(Q2).The10-yearpeakflowshallbeusedifVohuneIi—ConstructionStorniwaterPollutionPrevention—August20124-104.DesignandInstallationSpecifications theprojectsize,expectedtiminganddurationofconstruction,ordownstreamconditionswarrantahigherlevelofprotection.Ifnohydrologicanalysisisrequired,theRationalMethodmaybeused.Determinetherequiredsurfaceareaatthetopoftheriserpipewiththeequation:£4=2xQ2/0.00096or2080squarefeetpercfsofinflowSeelIMPC240formoreinformationonthederivationofthesurfaceareacalculation.Thebasicgeometryofthepondcannowbedeterminedusingthefollowingdesigncriteria:•RequiredsurfaceareaSA(fromStep2above)attopofriser.•Minimum3.5-footdepthfromtopofrisertobottomofpond.•Maximum311:lVinteriorsideslopesandmaximum2H:IVexteriorslopes.Theinteriorslopescanbeincreasedtoamaximumof2H:IViffencingisprovidedatorabovethemaximumwatersurface.•Onefootoffreeboardbetweenthetopoftheriserandthecrestoftheemergencyspiflway.•Flatbottom.•Minimum1-footdeepspillway.•Length-to-widthratiobetween3:1and6:1.•SizingofDischargeMechanisms.Theoutletforthebasinconsistsofacombinationofprincipalandemergencyspillways.Theseoutletsmustpassthepeakrunoffexpectedfromthecontributingdrainageareafora100-yearstorm.If,duetositeconditionsandbasingeometry,aseparateemergencyspill-wayisnotfeasible,theprincipalspillwaymustpasstheentirepeakrunoffexpectedfromthe100-yearstorm.However,anattempttoprovideaseparateemergencyspiliwayshouldalwaysbemade.Therunoffcalculationsshouldbebasedonthesiteconditionsduringconstruction.Theflowthroughthedewateringorificecannotbeutilizedwhencalculatingthe100-yearstormelevationbecauseofitspotentialtobecomeclogged;therefore,availablespiliwaystoragemustbeginattheprincipalspillwayrisercrest.Theprincipalspillwaydesignedbytheprocedurescontainedinthisstandardwillresultinsomereductioninthepeakrateofrunoff.However,theriseroutletdesignwillnotadequatelycontrolthebasindischargetothepredevelopmentdischargelimitationsasstatedinMinimumRequirement#7:FlowControl.However,ifthebasinforapermanentstonrnvaterdetentionpondisusedforatemporaryVolumeII—ConstructionStonnwaterPollutionPrevention—August20124-105 sedimentationbasin,thecontrolstructureforthepermanentpondcanbeusedtomaintainpredevelopmentdischargelimitations.Thesizeofthebasin,theexpectedlifeoftheconstructionproject,theanticipateddownstreameffectsandtheanticipatedweatherconditionsduringconstruction,shouldbeconsideredtodeterminetheneedofadditionaldischargecontrol.Seefjgure4.2.21forriserinflowcurves.Figure4.2.19—SedimentPondCrossSectionVohune11—(‘onstructionStormwaterPollutionPrevention—August20124-106Thepondlengthshattbe3to6timesthemaximumpondwidthInflowNote:PondmaybeformedbybermorbypartialormpteteexcavationFigure4.2.18—SedimentPondPlanViewRiserpipe(principalspiliway)openattopwithtrashrackCrestofDewateringdeviceriserdetail)emergentspiliway6’mm.Width(seenotbeusedJrWirebackedsiltstakedhaybalesvmppedconveyanceoutletorwithfitterfabric,orequivalentdividerDewateringConcretebaseorifice(seeriserdetail)levelspreader.ta*’Utt— Figure4.2.20—SedimentPondRiserDetailVolumeI!—ConstructionStormwaterPollutionPrevention—August20124-107.PolyethylenecapProvideadequateSIreppin9Perforatedpolyethylenedrainagetubing,diametermm,2’largerthandewaleringorifice.WatertightMSHTDM2B4E‘i/,iit=1Corrugatedmetalriser3.5’mm.Tackweld7DewateringDitice,hedule,.—4OealtiubmmDiameteraspercalculatonsIIG’nin.18in.Lrama:i*metatakesIConcru:abaandwirenaybe‘usedtopreventfatalon2Xriserdia.Mn.,j_:. 100C0UCCCE.10CC0.0UaFigure4.2.21—RiserInflowCurvesVolumeII—ConstrucfloiiStormwaterPollutionPrevention—August20124-1080.1110HEADINFEET(mensuredfromcrestofriser)0w.w7OH”o,Ioc.=3782‘HIn0incit.DandHInfeetSlopechangeoccursatwelr.orificetransition PrincipalSpiliway:Determinetherequireddiameterfortheprincipalspiliway(riserpipe).Thediametershallbetheminimumnecessarytopassthesite’s15-minute,10-yearfiowrate.TfusingtheWesternWashingtonHydrologyModel(WWHM),Version2or3,designflowisthe10-year(1hour)flowforthedeveloped(unmitigated)site,multipliedbyafactorof1.6.UseFigure4.2.21todeterminethisdiameter(Ii=1-foot).Vote:Apermanentcontrolstructuremaybeusedinsteadofatemporal)’riser.EmergencyOverflowSpiliway:DeterminetherequiredsizeanddesignoftheemergencyoverflowspillwayforthedevelopedIOU-yearpeakflowusingthemethodcontainedinVolumelIT.DewateringOrifice:Determinethesizeofthedewateringorifice(s)(minimum1-inchdiameter)usingamodifiedversionofthedischargeequationforaverticalorificeandabasicequationfortheareaofacircularorifice.Determinetherequiredareaoftheorificewiththefollowingequation:A—____________—0.6x3600Tg°5whereA0=orificearea(squarefeet)=pondsurfacearea(squarefeet)h=headofwateraboveorifice(heightofriserinfeet)T=dewateringtime(24hours)g=accelerationofgravity(32.2feet/second2)ConverttherequiredsurfaceareatotherequireddiameterDoftheorifice:D=24x=13.54xThevertical,perforatedtubingconnectedtothedewateringorificemustbeatleast2incheslargerindiameterthantheorificetoimproveflowcharacteristics.Thesizeandnumberofperforationsinthetubingshouldbelargeenoughsothatthetubingdoesnotrestrictflow.Theorificeshouldcontroltheflowrate.AdditionalDesignSpecificationsThepondshallbedividedintotworoughlyequalvolumecellsbyapermeabledividerthatwillreduceturbulencewhileallowingmovementofwaterbetweencells.Thedividershallbeatleastone-halftheheightoftheriserandaminimumofonefootbelowthetopoftheriser.Wire-backed,2-to3-foothigh,extrastrengthfilterfabricsupportedbytreated4x4’scanbeusedasadivider.Alternatively,stakedstrawbaleswrappedwithfilterfabric(geotextile)maybeused.Ifthepondismorethan6feetdeep,adifferentmechanismmustbeproposed.AriprapembankmentisoneacceptablemethodofVolume1!—ConstructionStonnwaterPollutionPrevention—August20124-109-.,.,._________________ separationfordeeperponds.Otherdesignsthatsatisfytheintentofthisprovisionareallowedaslongasthedividerispermeable,structurallysound,anddesignedtopreventerosionunderoraroundthebarrier.Toaidindeterminingsedimentdepth,one-footintervalsshallbeprominentlymarkedontheriser.11anembankmentofmorethan6feetisproposed,thepondmustcomplywiththecriteriacontainedinVolume111regardingdamsafetyfordetentionBMPs.Themostcommonstructuralfailureofsedimentationbasinsiscausedbypiping,Pipingreferstotwophenomena:(I)waterseepingthroughfine-grainedsoil,erodingthesoilgrainbygrainandformingpipesortunnels;and,(2)waterunderpressureflowingupwardthroughagranularsoilwithaheadofsufficientmagnitudetocausesoilgrainstolosecontactandcapabilityforsupport.Themostcriticalconstructionsequencestopreventpipingwillbe:I.Tightconnectionsbetweenriserandbarrelandotherpipeconnections.2.Adequateanchoringofriser.3.Propersoilcompactionoftheembankmentandriserfooting.4.Properconstructionofanti-seepdevices.Maintenance•Sedimentshallberemovedfromthepondwhenitreaches1—footinStandardsdepth..Anydamagetothepondembankmentsorslopesshallberepaired.BMPC250:ConstructionStormwaterChemicalTreatmentPurposeThisBMPapplieswhenusingstormwaterchemicalsinbatchtreatmentorflow-throughtreatment.Turbidityisdifficulttocontroloncefineparticlesaresuspendedinstormwaterrunofffromaconstructionsite.Sedimentationpondsareeffectiveatremovinglargerparticulatematterbygravitysettling,butareineffectiveatremovingsmallerparticulatessuchasclayandfinesilt.TraditionalerosionandsedimentcontrolBMPsmaynotbeadequatetoensurecompliancewiththewaterqualitystandardsforturbidityinreceivingwater.Chemicaltreatmentcanreliablyprovideexceptionalreductionsofturbidityandassociatedpollutants.Chemicaltreatmentmayberequiredtomeetturbiditystormwaterdischargerequirements,especiallywhenconstructionistoproceedthroughthewetseason.ConditionsofUseFormalwrittenapprovalfromEcologyisrequiredfortheuseofchemicaltreatmentregardlessofsitesize.TheLocalPermittingAuthoritymayalsoVolumeII—ConstructionStonnwaterPollutionPrevention—August20124-110 OperatorTraining:Eachcontractorwhointendstousechemicaltreatmentshallbetrainedbyanexperiencedcontractor.EachsiteusingchemicaltreatmentmusthaveanoperatortrainedandcertifiedbyanorganizationapprovedbyEcology.StandardBMPs:SurfacestabilizationBMPsshouldbeimplementedonsitetopreventsignificanterosion.Allsitesshalluseatruckwheelwashtopreventtrackingofsedimentoffsite.SedimentRemovalandDisposal:Sedimentshallberemovedfromthestorageortreatmentcellsasnecessary.Typically,sedimentremovalisrequiredatleastonceduringawetseasonandatthedecommissioningofthecells.Sedimentremaininginthecellsbetweenbatchesmayenhancethesettlingprocessandreducetherequiredchemicaldosage.•Sedimentthatisknowntobenon-toxicmaybeincorporatedintothesiteawayfromdrainages.BMPC251:ConstructionStormwaterFiltrationPurposeFiltrationremovessedimentfromrunofforiginatingfromdisturbedareasofthesite.BackgroundInfonnadon:Filtrationwithsandmediahasbeenusedforoveracenturytotreatwaterandwastewater.Theuseofsandfiltrationfortreatmentofstormwaterhasdevelopedrecently,generallytotreatrunofffromstreets,parkinglots,andresidentialareas.Theapplicationoffiltrationtoconstructionstormwatertreatmentiscurrentlyunderdevelopment.ConditionsofUseTraditionalBMPsusedtocontrolsoilerosionandsedimentlossfromsitesunderdevelopmentmaynotbeadequatetoensurecompliancewiththewaterqualitystandardforturbidityinthereceivingwater.Filtrationmaybeusedinconjunctionwithgravitysettlingtoremovesedimentassmallasfinesilt(0.5pm).Thereductioninturbiditywillbedependentontheparticlesizedistributionofthesedimentinthestormwater.Insomecircumstances,sedimentationandfiltrationmayachievecompliancewiththewaterqualitystandardforturbidity.TheuseofconstructionstormwaterfiltrationdoesnotrequireapprovalfromEcologyaslongastreatmentchemicalsarenotused.FiltrationinconjunctionwithpolymertreatmentrequirestestingundertheChemicalTechnologyAssessmentProtocol—Ecology(CTAPE)beforeitcanbeinitiated.ApprovalfromtheappropriateregionalEcologyofficemustbeobtainedateachsitewherepolymersuseisproposedpriortouse.FormoreguidanceonstomiwaterchemicaltreatmentseeBMPC250..Vohunefl—ConstructionStormwaterPollutionPrevention—August20124-118 DesignandinstallationSpecificationsiliaintenaneeStandardsTwotypesoffiltrationsystemsmaybeappliedtoconstructionstormwatertreatment:rapidandslow.Rapidsandfiltersarethetypicalsystemusedforwaterandwastewatertreatment.Theycanachieverelativelyhighhydraulicflowrates,ontheorderof2to20gpm/sf,becausetheyhaveautomaticbackwashsystemstoremoveaccumulatedsolids.Incontrast,slowsandfillershaveverylowhydraulicrates,ontheorderof0.02gpm/sf,becausetheydonothavebackwashsystems.Slowsandfiltrationhasgenerallybeenusedtotreatstormwater.Slowsandfiltrationismechanicallysimpleincomparisontorapidsandfiltrationbutrequiresamuchlargerfilterarea.FiltrationEquipmentSandmediafiltersareavailablewithautomaticbackwashingfeaturesthatcanfilterto50pmparticlesize.Screenorbagfilterscanfilterdownto5pm.Fiberwoundfilterscanremoveparticlesdownto0.5pm.Filtersshouldbesequencedfromthelargesttothesmallestporeopening.Sedimentremovalefficiencywillberelatedtoparticlesizedistributioninthestormwater.TreatmentProcessDescription.Stormwateriscollectedatinterceptionpoint(s)onthesiteandisdivertedtoanuntreatedstormwatersedimentpondortankforremovaloflargesedimentandstorageoftheslormwaterbeforeitistreatedbythefiltrationsystem.Theuntreatedstormwaterispumpedfromthetrap,pond,ortankthroughthefiltrationsysteminarapidsandfiltrationsystem.Slowsandfiltrationsystemsaredesignedasflowthroughsystemsusinggravity.Rapidsandfilterstypicallyhaveautomaticbackwashsystemsthataretriggeredbyapre-setpressuredropacrossthefilter.Ifthebackwashwatervolumeisnotlargeorsubstantiallymoreturbidthantheuntreatedstormwaterstoredintheholdingpondorlank,backwashreturntotheuntreatedstormwaterpondortankmaybeappropriate.However,othermeansoftreatmentanddisposalmaybenecessary.•Screen,bag,andfiberfiltersmustbecleanedand/orreplacedwhentheybecomeclogged.•Sedimentshallberemovedfromthestorageand/ortreatmentpondsasnecessary.Typically,sedimentremovalisrequiredonceortwiceduringawetseasonandatthedecommissioningoftheponds.SizingCriteriaforFlow-ThroughTreatmentSystemsforFlowControlExemptWaterBodies:Whensizingstoragepondsortanksforflow-throughsystemsforflowcontrolexemptwaterbodiesthetreatmentsystemcapacityshouldbeafactor.Theuntreatedstormwaterstoragepondortankshouldbesizedtohold1.5timestherunoffvolumeofthe10-year,24-hourstormeventminusthetreatmentsystemflowrateforan8-hourperiod.Forachitosanenhancedsandfiltrationsystem,thetreatmentsystemflowrateshouldbesizedusingahydraulicloadingratebetween6-8gpnVfi2.OtherhydraulicVohune11—ConstructionStonnwaterPollutionPrevention—August20124-119 loadingratesmaybemoreappropriateforothersystems.Bypassshouldbeprovidedaroundthechemicaltreatmentsystemtoaccommodateextremestorms.RunoffvolumeshallbecalculatedusingthemethodspresentedinVolume3,Chapter2.Worst-caseconditions(i.e.,producingthemostrunoff)shouldbeusedforanalyses(mostlikelyconditionspresentpriortofinallandscaping).SizingCriteriaforFlowControlWaterBodies:Sitesthatmustimplementflowcontrolforthedevelopedsiteconditionmustalsocontrolstounwaterreleaseratesduringconstruction.Constructionsitestormwaterdischargesshallnotexceedthedischargedurationsofthepre-developedconditionfortherangeofpre-developeddischargeratesfrom1/2ofthe2-yearflowthroughthe10-yearflowaspredictedbyanapprovedcontinuousrunoffmodel.Thepre-developedconditiontobematchedshallbethelandcoverconditionimmediatelypriortothedevelopmentproject.Thisrestrictiononreleaseratescanaffectthesizeofthestoragepond,thefiltrationsystem,andtheflowratethroughthefiltersystem.ThefollowingishowWWHMcanbeusedtodeterminethereleaseratesfromthefiltrationsystems:I.Determinethepre-developedflowdurationstobematchedbyenteringthelanduseareaunderthe‘Pre-developed”scenarioinWWHM.Thedefaultflowrangeisfrom¼ofthe2-yearflowthroughthe10-yearflow.2.Enterthepostdevelopedlanduseareainthe“DevelopedUnmitigated”scenarioinWWHM.3.Copythelanduseinformationfromthe“DevelopedUnmitigated”to“DevelopedMitigated”scenario.4.Therearetwopossiblewaystomodelstormwaterfiltrationsystems:a.Thestormwaterfiltrationsystemusesanuntreatedstormwaterstoragepond/tankandthedischargefromthispond/tankispumpedtooneormorefilters.In-linefiltrationchemicalswouldbeaddedtotheflowrightafterthepond/tankandbeforethefiLter(s).Becausethedischargeispumped,WWHMcan’tgenerateastage/storage/discharge(SSD)tableforthissystem.ThissystemismodeledthesamewayasdescribedinBMPC250andisasfollows:Whileinthe“DevelopedMitigated”scenario,addapondelementunderthebasinelementcontainingthepost-developedlanduseareas.Thispondelementrepresentsinformationontheavailableuntreatedstomiwaterstorageanddischargefromthefiltrationsystem.Incaseswherethedischargefromthefiltrationsystemiscontrolledbyapump,astage/storage/discharge(SSD)tablerepresentingthepondmustbegeneratedoutsideWWHMandVolume11—ConstructionStormwaterPollutionPrevention—August20124-120-—‘———--“—_____ importedintoWWHM.WWHMcanroutetherunofffromthepost-developedconditionthroughthisSSDtable(thepond)anddeterminecompliancewiththeflowdurationstandard.ThiswouldbeaniterativedesignprocedurewhereiftheinitialSSDtableprovedtobeoutofcompliance,thedesignerwouldhavetomodi&theSSDtableoutsideWWHMandre-importinWWHMandrouletherunoffthroughitagain.Theiterationwillcontinueuntilapondthatenablescompliancewiththeflowdurationstandardisdesigned.NotesonSSDtablecharacteristics:ThepumpdischargeratewouldlikelybeinitiallysetatjustbelowV2ifthe2-yearflowfromthepre-developedcondition.Asrunoffcomingintotheuntreatedstormwaterstoragepondincreasesandtheavailableuntreatedstormwaterstoragevolumegetsusedtip,itwouldbenecessarytoincreasethepumpdischargerateabove1/2ofthe2-year.Theincrease(s)aboveV2ofthe2-yearmustbesuchthattheyprovidesomerelieftotheuntreatedstormwaterstorageneedsbutatthesametimetheywillnotcauseviolationsoftheflowdurationstandardatthehigherflows.ThefinaldesignSSDtablewillidenti&theappropriatepumpingratesandthecorrespondingstageandstorages.Whenbuildingsuchaflowcontrolsystem,thedesignmustensurethatanyautomaticadjustmentstothepumpingrateswillbeasaresultofchangestotheavailablestorageinaccordancewiththefinaldesignSSDtable.b.Thestormwaterfiltrationsystemusesastoragepond/tankandthedischargefromthispond/tankgravityflowstothefilter.ThisisusuallyaslowsandfiltersystemanditispossibletomodelitinWWHMasaFilterelementorasacombinationofPondandFilterelementplacedinseries.Thestage/storage/dischargetable(s)maythenbegeneratedwithinWWHMasfollows:(i)Whileinthe“DevelopedMitigated”scenario,addaFilterelementunderthebasinelementcontainingthepost-developedlanduseareas.Thelengthandwidthofthisfilterelementwou]dhavetobethesameasthebottomlengthandwidthoftheupstreamuntreatedstormwaterstoragepond/tank.(ii)Incaseswherethelengthandwidthofthefilterisnotthesameasthoseforthebottomoftheupstreamuntreatedstorrnwaterstoragetank/pond,thetreatmentsystemmaybemodeledasaPondelementfollowedbyaFilterelement.Byhavingthesetwoelements,WWHMwouldthengenerateaSSDtableforthestoragepondwhichthengravityflowstotheFilterelement.TheFilterelementdownstreamoftheuntreatedstormwaterVolume!!—Co,,sfructionStonuwaterPollutionPrevention—August20124-121 storagepondwouldhaveastoragecomponentthroughthemedia,andanoverflowcomponentforwhenthefiltrationcapacityisexceeded.WWFIMcanroutetherunofffromthepost-developedconditionthroughthetreatmentsystemsin4banddeterminecompLiancewiththeflowdurationstandard.Thiswouldbeaniterativedesignprocedurewhereiftheinitialsizingestimatesforthetreatmentsystemprovedtobeinadequate,thedesignerwouldhavetomodifythesystemandroutetherunoffthroughitagain.Theiterationwouldcontinueuntilcompliancewiththeflowdurationstandardisachieved.5.Itshouldbenotedthattheaboveprocedureswouldbeusedtomeettheflowcontrolrequirements.Thefiltrationsystemmustbeabletomeettherunofftreatmentrequirements.Itislikelythatthedischargeflowrateof¼ofthe2-yearormoremayexceedthetreatmentcapacityofthesystem.Ifthatisthecase,theuntreatedstormwaterdischargerate(s)(i.e.,influenttothetreatmentsystem)mustbereducedtoallowpropertreatment.Anyreductionintheflowswouldlikelyresultintheneedforalargeruntreatedstormwaterstoragevolume.Ifsystemdesigndoesnotallowyoutodischargeattheslowerratesasdescribedaboveandifthesitehasaretentionordetentionpondthatwillservetheplanneddevelopment,thedischargefromthetreatmentsystemmaybedirectedtothepermanentretention/detentionpondtocomplywiththeflowcontrolrequirements.Inthiscase,theuntreatedstormwaterstoragepondandtreatmentsystemwillbesizedaccordingtothesizingcriteriaforflow-throughtreatmentsystemsforflowcontrolexemptwaterbodiesdescribedearlierexceptalldischarges(waterpassingthroughthetreatmentsystemandstormwaterbypassingthetreatmentsystem)willbedirectedintothepermanentretention1detentionpond.Ifsiteconstraintsmakelocatingtheuntreatedstormwaterstorageponddifficult,thepermanentretention/detentionpondmaybedividedtoserveastheuntreatedstoimwaterdischargepondandthepost-treatmentflowcontrolpond.Abermorbarriermustbeusedinthiseasesotheuntreatedwaterdoesnotmixwiththetreatedwater.Bothuntreatedstormwaterstoragerequirements,andadequatepost-treatmentflowcontrolmustbeachieved.Thepost-treatmentflowcontrolpond’sreviseddimensionsmustbeenteredintotheWWHMandtheWWHMmustberuntoconfirmcompliancewiththeflowcontrolrequirement.VolwneII—ConstructionStonuwaterPollutionPrevention—August20124-122.n-- StormwaterPollutionPreventionPlanAppendixD—GeneralPermit29 StormwaterPollutionPreventionPlanAppendixE—SiteInspectionForms(andSiteLog)Theresultsofeachinspectionshallbesummarizedinaninspectionreportorchecklistthatisenteredintoorattachedtothesitelogbook.Itissuggestedthattheinspectionreportorchecklistbeincludedinthisappendixtokeepmonitoringandinspectioninformationinonedocument,butthisisoptional.However,itismandatorythatthisSWPPPandthesiteinspectionformsbekeptonsiteatalltimesduringconstruction,andthatinspectionsbeperformedanddocumentedasoutlinedbelow.Ataminimum,eachinspectionreportorchecklistshallinclude:a.Inspectiondate/timesb.Weatherinformation:genera!conditionsduringinspection,approximateamountofprecipitationsincethelastinspection,andapproximateamountofprecipitationwithinthelast24hours.c.AsummaryorlistofallBMPsthathavebeenimplemented,includingobservationsofallerosioWsedimentcontrolstructuresorpractices.d.Thefollowingshallbenoted:i.locationsofBMPsinspected,ii.locationsofBMPsthatneedmaintenance,iii.thereasonmaintenanceisneeded,iv.locationsofBMPsthatfailedtooperateasdesignedorintended,andv.locationswhereadditionalordifferentBMPsareneeded,andthereason(s)whye.Adescriptionofstormwaterdischargedfromthesite.Thepresenceofsuspendedsediment,turbidwater,discoloration,and/oroilsheenshallbenoted,asapplicable.f.Adescriptionofanywaterqualitymonitoringperformedduringinspection,andtheresultsofthatmonitoring.g.Generalcommentsandnotes,includingabriefdescriptionofanyBMPrrepairs,maintenanceorinstallationsmadeasaresultoftheinspection.h.Astatementthat,inthejudgmentofthepersonconductingthesiteinspection,thesiteiseitherincomplianceoroutofcompliancewiththetermsandconditionsoftheSWPPPandtheNPDESpermit.Ifthesiteinspectionindicatesthatthesiteisoutofcompliance,theinspectionreportshallincludeasummaryofthe30 -ateStormwaterPollutionPreventionPlanremedialactionsrequiredtobringthesitebackintocompliance,aswellasascheduleofimplementation.i.Name,title,andsignatureofpersonconductingthesiteinspection;andthefollowingstatement:“Icertifyunderpenaltyoflawthatthisreportistrue,accurate,andcomplete,tothebestofmyknowledgeandbelief’.WhenthesiteinspectionindicatesthatthesiteisnotincompliancewithanytermsandconditionsoftheNPDESpermit,thePermitteeshalltakeimmediateaction(s)to:stop,contain,andcleanuptheunauthorizeddischarges,orotherwisestopthenoncompliance;correcttheproblem(s);implementappropriateBestManagementPractices(BMPs),and/orconductmaintenanceofexistingBMPs;andachievecompliancewithallapplicablestandardsandpermitconditions.Inaddition,ifthenoncompliancecausesathreattohumanhealthortheenvironment,thePermitteeshallcomplywiththeNoncomplianceNotificationrequirementsinSpecialConditionS5.Fofthepermit.3’ StormwaterPollutionPreventionPlanSiteInspectionFormGeneralInformationProjectName:InspectorName:Date:InspectionType:DDCTitle:CESCL#:Time:WeatherPrecipitationDescriptionofGeneralSiteConditions:Element2:EstablishConstructionAccessEleuzent1:MarkQeathigLimitsInspectionofBMPs32 StormwaterPollutionPreventionPlanElement3:controlFlowRatesBMP:InspectedFunctioningLocationYNNIPProblem/CorrectiveActionBMP:InspectedFunctioningLocationYNNNIPProblem/CorrectiveActionElement4:InstallSedhacmControlsBMP:InspectedFunctioningProblem/CorrectiveActionLocationYN[XNNWBMP:InspectedFunctioningLocationYN__ ___NWProblem/CorrectiveActionBMP:InspectedFunctioningProblem/CorrectiveActionLocationYNLYNNWBMP:InspectedFunctioningProblem/CorrectiveActionLocationYNENNIPBMP:InspectedFunctioningLocationYNLXNNPProblem/CorrectiveActionH33 Element5:StabilizeSoilsBMP:LocationStormwaterPollutionPreventionPlanEEZElement6:ProtectSlopes34 Element7:ProtectDrainInletsBMP:StormwaterPollutionPreventionPlanEZ__LE__Elenient8:StabilizeGhannelsandOutletsEE__LI_I__35 StormwaterPollutionPreventionPlanElement9:(‘ontrolPollutantsElement10:ControlDewatering36 StormwaterPollutionPreventionPlanStormwaterDischargesFromtheSiteObserved?Problem/CorrectiveActionLocationTurbidity______Discoloration____ ___Sheen____ ___LocationTurbidityDiscolorationShe e n __ _ __ ___ ___ ___ _37 StormwaterPollutionPreventionPlanWaterQualityMonitoringWasanywaterqualitymonitoringconducted?uYesDNoIfwaterqualitymonitoringwasconducted,recordresultshere:Ifwaterqualitymonitoringindicatedturbidity250NTUorgreater;ortransparency6cmorless,wasEcologynotifiedbyphonewithin24hrs?______DYesaNoifEcologywasnotified,indicatethedate,time,contactnameandphonenumberbelow:Date:Time:ContactName:Phone#:GeneralCommentsandNotesIncludeBMPrepairs,maintenance,orinstallationsmadeasaresultoftheinspection.WerePhotosTaken?aYesaNoIfphotostaken,describephotosbelow:.38 StormwaterPollutionPreventionPlanAppendixF—EngineeringCalculations39 . COUGHLINPORTERLUNDEENSTRUCTURALCIVILSEISMICENGINEERINGSouthportOfficeTESCTemporarySedimentPond*thevolumeisbasedonaminimumponddepthof3.5’-thisdepthdoesnotincludetheminimumsedimentstoragevolumeorfreeboardQ2FS.Vdwhere:S.A.=Minimumallowabletopsurfaceareaofpondffi2)Qio=DesignPeakFlowRate(cft)perBMP241.=ApproximateParticleSettlingVelocity=000096fL/sF.S.=Factorofsafety=2ProjectAreaSedimentPondsurfacearearequiredforconstructionrunoff:LandCoverCharacteristics:MSSFloodResults:ImperviousArea=4.12AcresPeakflowforthe2-yearrunoffevent(assume100%imperviousduring1.478cfsconstruction)(seeMGSFloodanalysis)Q2=1.478cfsS.A=3079SFAssumeanaveragestoragedepthof3.5feet,therequiredvolumeis:Volume=10,777CF80,617gallonsAssume18,100gallonspersedimentstoragetank,thensedimentstoragetanksarerequired.Project:DesignedBy:Date:ProjectNo:ClientCheckedBy:Sheet801SECONDAVENUE.SUITE900SEATTLE,WA96104/P206.343.0460/cplinc.ccmrJ::jtc4*:krj.*IJZit;:ZJE...iZtL. . . .