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HomeMy WebLinkAboutmarked up TIR for Monterra townhomestk-rct1o7-6-1ier<kiTTECHINICALINFORMATIONREPOWl’5t—r,cctJ—J1FORCtIVOFRENTONRECEIVEDAPR222016iouterraRenton,Washingtonfebruary2.016Preparedfor:PoolBrothersConstruction720N.1O’Street#A105RentoflWA9057Preparedb;DanielSmith,P1..,ProjectManagerApprovedBy:CraigDenver,PrincipalRFPORT#14038/i1,t\l4O3.Q\ReporIsrmMomerra.TIN.docBUILDINGDlVISION PAGEProjectOverview.ConditionsandRequirementsSummary19AnalysisofTheEightCoreRequirements19AnalysisofSpecialRequirements21Off-SiteAnalysis233.1StudyAreaDefinitionAndMaps233.2ResourceReview233.3fieldInspection243.4DrainageSystemDescriptionandProblemDescriptions243.5MitigationOfExistingorPotentialProblems254.0StormwaterAnalysisandDesign344.1ExistingSiteHydrology344.2DevelopedSiteHydrology344.3PerfonnanceStandards354.4FlowControlSystem354.5WaterQualitySystem365.0ConveyanceSystemAnalysisandDesign406.0SpecialReportsandStudies437.0OtherPermits748.0EscAnalysisandDesign759.0BondQuantities7610.0OperationsandMaintenanceManual$6LISTOFFIGURESFigure1.1—TechnicalInformationReport(TIR)Worksheet2Figure1.2—VicinityMap$Figure1.3—DrainageBasinMaps10Figure1.4—SoilMapandDescriptions13figure3.1—FEMAMap26Figure3.2—SensitiveAresMap2$figure3.3—OffsiteAnalysisDrainageSystemTable30Figure3.4—DrainageAnalysisMaps32Figure4.1—KRCTSOutputs37Figure5.1—LDDComputerOutput41Figure6.1—GeotechnicalEngineer’sReport44P:\1403$.0\Reports\Storm\Monterra.TIR.docz,/1.02.02.12.23.0 1.0PROJECTOVERVIEWTheMonterraprojectconsistofasingle12,Sl9sq.ft.(0.29-acres)parcel(#311990-0051)locatedat905SunsetBlvd.NEintheCityofRenton,KingCounty,Washington.TheprojectalsolieswithinaportionoftheSW¼oftheNE¼ofSectiong,Township23North,Range5EastW.M.RefertoFigure2—VicinityMapwithinthissection.Thesiteisgenerallyrectangularinshape,andcontainsanexistingdriveaislewithinaneasementalongitsnorthernpropertyline.Theremainderofthesiteiscoveredwithdensevegetation,andslopesfromtheeasttothewestatanapproximategradientof10%.Anexistinghouseusetobeonsite,butitwasremovedafter2005.Thepropertyissurroundedbymultifamilydevelopmentstothenorth,southandwest.TotheeastthepropertyabutsSunsetBlvd.NEofwhichasinglefamilyresidenceislocatedacrossthestreet.SitesoilsconsistofRagnar-Indianolaassociation,sloping(RdC).ThesesoilsareclassifiedastypeAsoilsbytheDepartmentofEcology.EarthSolutionsNWhaspreparedageotechnicalengineer’sreportdatedDecember10,2015.TheydiscoveredfinesandswhicharetypicalofRagnar-Indianolatypesoils,pleaserefertofigure4foraNRCSsoilsmapanddescriptions.L,Li°PRT715-S&CT7_d’r,rcuLoC7if£A-j1oflJ4RZVfL-7%r1”.TheMonterraprojectproposestheconstructionoffiveattachedtownhomes,driveways,walkways,frontageimprovements,andassociatedutilities.ThesiteimprovementsaredesignedpertheCity’sstandardsandit’samendmentstothe2009KingCountySurfaceWaterDesignManual(Manual).TheprojectsiterequiresafullDrainageReviewanditimplementsSmallSiteBMPsforstormwaterflowcontrol—morespecificallylimitedinfiltration.TheprojectmeetsExemption#1forrunofftreatment.ATIRworksheethasbeenincludedinFigure1ofthissection.Iv-r-rt-7C2SHo&CcyroLPage1P:\14038.0\Reports\Storm\Monterra.TIR.doc Figure1.1—TechnicalInformationReport(TIR)WorksheetPage2P:\1403$.0\Reports\Storm\Monterra.TIR.doc cIN((OLNTY.tV\Stl[NGTON.SURIACEWATERDES)CiNMANIALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPartIPROJECTOWNERANDPROJECTENGINEERProjectOwnerIoo1FrosihersCon&t.PhoneAddress720N.10thSt.STEM.05Ienton,_WA_9805ProjectEnneer_DanielSirrith,PEcompariCESInc.Phone5Ji11%2P.irtTYPLOFPERMITAPPUCATIONPart”PLANANDREPORTINFORMATIONTechnicalInformationReportTypeofDrnaeReview(Fuli)?Targeted/(circI:).SiteDateOncIuderevjon__________________dates):_ __ _ _ _ __ _ _ _ __ _D.teofFinalDateofApptoaI:SiteimprovementPlan(Engr.Plans)Type(crrcleone).tFuUMdifledISIàHSiteDate(includerevondates).DateofFinal:2009Sufe\ateIltcit’tiMamcd:?IPart2PROJECTLOCA1IONANDDESCRIPTION23NProjectNannMnleiinDDESPerm1WI_ _ ________ _ _ _ _ _ _ _ _LocationTownship_ _ ____ _ _ _ _ _ _ ___RangeSESectionS_ _ ___SiteAddress905SuryselMVi)NEULanduseServicesSubdivison/ShortSubU.IUPOJBuildingSercesM/FICurnmericfSFRUClearingandGradingLiRight-of-WayUseLiOtherREVIEWSANDPERMITSPart4OTHERLiCOh4D4LiDOEDamSafetyLiTEMATloodpianCOEWetlandsUOtheiUShorehneManagenientUStucturalRockeryNault!_____UESASrc1ion7Part6ADJUSTMENTAPPROVAl,$Iypetoicleone).(tand[)/ComplexIPreapphcation/EperirnentaiIBanketDesr-nphon’(neIudecondtioninhRSection2)Nut_Apphcuh]e_ _ _ _ _ _ _ _____________________________________________________________________________3 KlGCOL\TY.;SH1’JGTQ\,SURFACFWA1RL)LSIj)\N1.ALTECHNICALINFORMATIONREPORT(TIR)WORKSHEETPart7MONiTORINGREQUIREMENTS-Desiiib_ _ _ __ _ _ _ __ _ _ _ __ _ _ _ __ _ _ _ _Mon,torinRequired:YesNoStartDate:—___ ___ _ ___ _ ___ _ ___ _CompIeonDate:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Part8SiTECOMMtJNIrYANDDRAINAGEBASINCornmuniiyPlanCi1Ri________________________________SpecialDsffictOverlays:__ _ __ __ _ __ __ _____________________________________________DrDirmageBasirr(edarRiverLakeWalnnStormwiterReqLntements:Smal]LoB]’1PPart9ONSITEANDADJACENTSENSiTIVEAREAS21Rk’erfStream_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _21Steepsope_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _21Lake_________ _—(.1EruianHzzard___________________21Wetrtads__ _ __ _ _ -JLandslideHazard__ __ _ __ _ _ __ _ __ _ __ _ _ _21CladDopression_ __ _ _ __ _ _ __ _ _ __ _ _ __21CoalMinelIazar__ _ __ _ __ _ _ __ _ __ _ __21Floodplain___ ___ _ ___ _ ___ _ ___ _ ___ _ ___USeismicHrizrd__ _ _ __ _ __ _ __ _ _ _21Other_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _LIHabitatProttin__ _ _ _ __ __ __ _ _ _ __ _Part10SOILSSailTypeSlopesErosionPotcntialRdClOLoMuferae21HighGroundwaterTable(within5feet)USoleSourceAqwterUOthnr_____________________USeeps/Spifngs21AdditionalSheetsAttached2UllSurfaceW.IerI)in\tiiiu1L. K1GCUtIV,\ASHGTU.SURrACEV\rttDiSiG1A>UA[.TECHNiCALINFORMATIONREPORT(TJR)WORKSHEETPart11DRAINAGEDESIGNLIMtTAT1CNSREFERENCELtbITATIUN(SlTfCONSIA’iTi1Coie2—OffsiteAnalysis_____________________JSensitivefCriticalNeas_________________________________1JSPA_ _ _ _ _ _ _ _ __ __ __ _ __ _ __ _ __ _ __ _ __ _ __ ___ __ _LiOther________________________________ _ _ _ _ _ _ ___ ___ _ ___ _ ___ _ ___LiAddhonSheetsAttached12hRSUMMARYSHEETiprov;kiahRSumrnaShtperThteshodDichaeArealThreshildDischarteArea:jctsiteshedtotliw.ctasasingebasin..mPordecnphon)CoreReqtiirornonts(alt8apply)DsrhatNaturalLoationNumbcrofNaturalDischrqeIoeatiors1OftsiteAnalyi5LeveL.ii)213datetL_________________FoiCantroiLeveJ_3txempttonNmeet—findtacitjsummarysheeti5aJlSiteBMPIulllnltrmoiCorwcyanceSystemSpillccThTheittöatt:NAErosionandScdimentControlESCSiteSupervarTBDCrjntactPhone:___________AfterHoursPhone____ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _—MaintenanceandOperationHspoubIbiiPnvate.Public__ __ __ _ __ _ __ _ __ _ __ _IfPrtatMmeLyPLcurcd(YesjNof-riiIGuaraneesandPro¼,idedYc/N—Liability__ __ _ _ _ __ _ _ _ __ _ _ _ _ __ _ _ _ __ _ _ _ __ _ _ _ __ _WaterQuabtyType:Basic/Sens.LakeIEnhancedBasictiIBog(includefacIitysummarysheet)orExemptionNo1_ _ _ _ _ _ _ _ ________ _ _ __ _InndscapeManagementPlan:YestNo’)SpecialRequirements(asapplicable)___ _ _ ___ _ _ _ _ __AreaSpecificDrainageTypeCDAISDOIMDP/BPILMPfSharedFac.i(one)quircrncntsNameFIoodplainiFloodwayDelineation.•Type:MaoriMinorIExemption‘ioneiOOyearBaseFloodElevation(orranrje)._ _ ___ _ _ __DatumFloodProtectionracilitDescribe.ContclDescribelandLie(comm/iriclur,tnalIanduseDescribeanystructuralcnntrols•NIW)SurJL.aterDe:;in\tmua15 :I\GçOI\T’\‘HIcGTO\.SURTCEWATH&DlSt(T\MAUA[TECHNICALINFORMATIONREPORT(TIR)WORKSHEETOICnntrcHigh-useSiteYeIçNTreatmenICMP—r1aintenanceAgrcrnent:esf(Nol_ _ __ _ _ __ _ _ ____ __ _ _ __ _ __ _ __ _ _ _withvhom?__ _ _ __ _ _ _ _rDrairatructures__ _ __ _ _ _ _ __ __ __ __ _ _ _ __ __ _ __ __ __ _ _ _ __ _Decr’Ilt’]owgroundinliliraliontrcnchandupcircamndirnenicontrolstructure.a13ERDSONAND_SEDIMENTCONTROLREOUEMENTS___ __ ___ __ _ __MINIMUMESCREQUIREMENTSIMINIMUMESCREQUREMNTSDURINGCONSTRUCTIONAFTERCONSIRUCTIONCkoringLirnsIJStabthze[xpo.edSurfacesCoverMeasuresRemoveanaReMoteIempoiyESCEciIitiesFerimeerPrntertionCV-rnndeniuvAllSiftrindDebrisCosureTrarirIOperahonofPrmanrtFIIlie5ScdmentRetentionLIFbgIimitsofSACndopenspacepresetationareasLISurtaceWaterCoIleciooO t n e r ___ _ _ ___ _ _ ___ _ _ _LIDewaterincConfrelDustControlLIFlowConlrol_ __ __ _ __ __ ___ _ _ __I__ __ _ __ _ __ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ __ __Prt14S1ORMWATERrACILITDESCRIPTIC(NocIncludeFacitySummaryandSketch)FlowCuerc_jyp&DescnplionWtrQuIityTpe/DescntionU:DeteohonLIofiltrationLIInfiltralionI__ __ __ _ __ __ _ __ __ _ __LIWeipoolLiRegionalFacility__ _ _ ____ _ _ _ ____ _ _UMediaFkraiion__ _ _ _ ____LiSharedFacty___ __ _ _ _ __ __ __ _LioiControlFlowControlIntiltiationTcnchJ5pflCntroIBMPsUFIcwControIRMPsLiOtherLIOther2OOSurficeWarE)csin\LuniIOU9 KINGCOUNfl.\\SHI>GTON.SURFACE\AFLRDESIGNMANUMTECHNICALtNFORMATLONREPORT(TIR)WORKSHEETPart15EASEMENISJTRACTSi6SiRUCTURALANALYSISCiDraraF-isrrncnt—CastnVaulCiCovcnantCiRctFinrnqWailCiNativeGrowthProtectionCovenantCiKockery-4HighCiTractUStructuralonSteepSbpeLiOtherCiOtherPrt17SIGNAIIJREOFPROFESSIONALENGINEERI,ordenqineeiundermyuperision,havevisftethesite.ActualsitecondtionsasohsnedweceincorporatedintothiswokshetendthealtechedTechnicTInformationfepodTothebestofmyknuwferjQetheinformationprovdehereisaccurate.2Uti)Surl’\\1erDirniiutIII2Ot)9 Figure1.2—VicinityMapPage$P:\14O38.O\Reports\Storrn\MonterraTjRdoe $=‘!J; Figure1.3—DrainageBasinMapsPage10P:\14038.O\Reports\Storm\Monterra.TJRdoc MONTERRAPORTIONOFTHESW1/4OFTHENE1/4OFSECWILLAMETTEMERIDIAN,KINGCOUNTYEXISTINGBASINFLOWFREQUENCYTIJB—RAERIH00FL9t40USEEA(Ac.)REUNPERIWPE([COW£051100AIMPER000S0097100—YEAR6.041cIrslnhtXi t EXISTING09A09____________________5—YEYE0020CFS2—lEAR6.021CFS15.00WATEREASWCNT24.00ACCESSANOUSAPERAFN9007111033EASRENTPERAPR90071EI111———S09459ESAJ—---.--.--- -——-—_—‘1::i.——I\,—ct————-/-ii’/\\T\\II-‘:1)-TI/I\///c)I9—————I/1I\//////,//,////,////,/\L._..____fL__]1/////;I/////4\///I\.BASINBOUNDARYLINE//-/—.-‘————————‘—L—--p———.——-————-—__/___2<,_.<——-C-—I// C?:::0C?0—I—0Er0.-xwI0LULJ‘0U-‘1’I.‘IL‘H-j.1—1• Figure1.4—SoilsMapandDescriptionsPage13P:\14038.O\Reports\Storm\MonterraTlRdoc flC2C’0CCCCiMSzl*CCiC,U—‘I)‘to!1C—Ckisf:C’CCUCC-zrpCCtI*CUt1 .2.:3-zz3a—2.33(3>230(Jfl-t:3VIc2-?1ciciVIVI13.z2‘.-I’—aii—2,r—=33VI(3L(3:31k-o1mC)rnz33II:3:U(31V-31k:3.-‘-:3:3VI:3.21:311:3!Z--:.;•.:ç•‘3.1.3j_—:—.3(3L3——13C2p._——31?5‘“3:33‘3I:,(33333ft.433.33.6-3:33ID:3c.I]2VIVI3-:f:z(:3-33(3:33-ç—2:3-.0(3--1:3--1k.-S3——1)22.—3--——-3.3-I:CaI——‘-3--‘33-fl.4-.—•2>z0>H02 ciIMiKnirny?rWjtcnMapUnitLegendKijCornityAri,WahnUton(WA633)MapUmSyrnLoIMdpUnitAcresinAOlPeriitofINCkiar-Indantcn0,3100.CsbpinqTnI1sforAriioflntert1tU’NaturtRDurcesetSouivy12014ConrviiionSrjiceCoperatci1Suiveyo3 pUt’tDziponsigVArc,KingCountyArea,WashncitonRdC—Ragnar-Indianolaassociation,slopingMapUnitSettinjfJti)rk1mapU?7fSyflitJOi1hmiyEievfon:300to1000fotMtnrnnmlpictftafoiv30to65inchesMe&naann!airfwnparuWm.48to54aegreesFFroffrcnpennd150to210daySFam?ndcIsifsatianFarmiandofstatewideimportanceMapUnitctnpostonRinarandsimIarso;Ls45intIndia.riolandsimila,&iit.41]potcontEt?rnir-riascdonobservthuus,cipfin,andLiscLsofttenipunttDcriptionofaqnarSetting!ndfnris]cerS.kames.teiracParentinalerial(1aci-iIouiasTypicalprofileHI-CtoThcbes:ashyflns;ndyloamH24to27rnahesashyfinesandyloamH3-2Zto60inches:loamynandPropertiesandqualitiesSlope:2lo15percentDepThtocestflctivefeatum20to40inchestostronulycuntraslngtexturalstra1catonNaturaldrainagecla.sWelldranedCapacityof(homostlirniiinjlayertotranmiIwotnr(Kw)High(198to595in/hr)Depthtowatertable.Morethan0inchesTrequencyoffloodingNonerequencyofpodding,NoneAvailablewaetsto;ajeinpmfiiLow(nhout3.7inches;InterpretivegroupsLandeapabthfyclassffcation(tmgatnd):NonespecifiedLandcapabilityclassicatiori(noniffigatedI:3eHydrofoicSailGroupAOthervec,e(atWecfas.j/ca(,orrUnnamed(GOD2XN4O2WA)DescriptionofIndianolaSettingLigJfcjrm.TerracesPJfCfllmateriaLGlacialdrifttkOurlCecUreib3reyCnvtionServirNMn1pt;veurvtPi1u2 iipUilD.rpiinnR,rCLKf,n—KinqCcjn‘‘jtTypicalprofileHI0to6Thchsloamyfinsand1,2-6to30nhs:loamyfineeandH3-30tu60m:hssandPropertiesaridqualitiesSiope.2to15percentDplhtuetivefe&ure:Morethan50inchesNrurnidrainageclass:Somewhatexcessivelydrah,od‘rnosllimrt?Uaeatr3flc,fltPsrdiHh(18to595in/hr)Depthtuwiti:Wbic:MorethanSOnc)es&rcquencyoftcodiyNDI1EF:oquent.yu[pvnthncuNoneAvcuthloateiso,qiiiprvWeLowabou:50inches)InterpretivegroupsImucpnbthtycluzssihcalion(irrigaed)NonespecifiedLandcapabilityificiilIin(nnn,rriqated),3eHyr!miogscSoiGroupAOTherveqtatfteciu/Ptioi;UnnamedCOO2XN4O2WADataSourceInformationSoilSurveyArirKingCountyArea,WshungtunSurveyAreaDataVeriôn8,Dec1(3,2013NtiirnIResourcs-s’-GeivatiouSciviut3oiisurveyFj;2u2 2.0CONDITIONSANDREQUIREMENTSSUMMARYTheprojectissubjecttofullDrainageReviewasdictatedbytheManual’sCoreRequirementsNo.Ithrough8,andSpecialRequirementsNo.Ithrough5.2.1AnalysisoftheEightCoreRequirementsCoreRequirementNo.1:Dischar%eattheNaturalLocationIntent:Topreventadverseimpactstodownstreampropertiescausedbydiversionofflowfromoneflowpathtoanother,andtodischargeinamannerthatdoesnotsignificantlyimpactdownhillpropertiesordrainagesystems.Diversionscancausegreaterimpacts(fromgreaterrunoffvolumes)thanwouldotherwiseoccurfromnewdevelopmentdischargingrunoffatthenaturallocation.Diversionscanalsoimpactpropertiesthatrelyonrunoffwatertoreplenishwellsandornamentalorfishponds.Response:TheprojectproposestocontrolitsrunoffwiththeuseofLimitedInfiltration.Theproject’srunoffhistoricallyisinfiltratedasitsheetflowsacrossthesite.Runoffthatisnot--infiltratediscollectedbyprivateclosedconveyancesystemfortheappartrnentstothewest.7f‘o,.7iVV2CoreRecuireinentNo.2:Off-SiteAnalysisIntent:Toidenti’andevaluateoffsiteflooding,erosion,andwaterqualityproblemsthatmaybecreatedoraggravatedbytheproposedproject,andtoensureappropriatemeasuresareprovidedforpreventingcreationoraggravationofthoseproblems.Inaddition,thisrequirementisintendedtoensureappropriateprovisionsaremade,asneeded,tomitigateotheridentifiedimpactsassociatedwiththequantityandqualityofsurfaceandstormwaterrunofffromtheprojectsite(e.g.,impactstothehydrologyofawetlandasmaybeidentifiedbya“criticalareareport”perRMC4-3-050)P3m€1r-Response:Theprojectintendstocontrolitsrunoffwithfullinfiltrationwiththeuseofaninfiltrationtrenches.Runofffromtheproposedroofswillbecollectedonsiteandreleasedtothegroundwatertable.Theremainingrunoffisallowedtodischargedownstream.ALevelOne7LDownstreamAnalysisislocatedwithinSection3.0ofthisreport.(‘oreRequirementNo.3:flowControlIntent:Toensuretheminimumleve]ofcontrolneededtoprotectdownstreampropertiesandresourcesfromincreasesinpeak,duration,andvolumeofrunoffgeneratedbynewdevelopment.m1-7-Y7S.z7LCA1t?:44/fP:\I4038.0\Reports\Storm\Monterra.TIR.doc199r*- rCfVCLwz.TLt7e(i3CoreRequirementNo.5:TemporaryErosionandSedimentcontrolIntent:Topreventthetransportofsedimentandotherimpacts,likeincreasedrunoffrelatedtolanddisturbingactivities.Erosionofdisturbedareasonconstructionsitescanresultinexcessivesedimenttransporttoadjacentpropertiesandtosurfacewaters.Thissedimentcanresultinmajoradverseimpacts,suchasfloodingfromobstructeddrainageways,smotheringofsalmonidspawningbeds,algalbloomsinlakes,andexceedancesofstatewaterqualitystandardsforturbidity.Theseimpactscanalsoresultfromtheincreasedrunoffgeneratedbylanddisturbingactivitiesonconstructionsites.Page20CoreRequirementNo.4:ConveyaizceSystemmcM6‘C1tooY?M%1ThelevelofcontrolvariesdependingonlocationanddownstreamconditionsidentifiedunderCoreRequirement#2.Response:Theprojectislessthan22,000squarefeetandisbeingdevelopedasanindividualsite;therefore,theprojectusesSmallLotBMPsasdescribedinAppendixCoftheManual.Morespecificallylimitedinfiltration(SectionC.2.2)isimplementedfortheproject’srooftops.PerFigure5.2.1.AofAppendixCofthemanualaindividuallotlessthan22,000sq.ft.inwhichfulldispersionandinfiltrationisnotfeasiblemustcontrolatleast20%ofitssiteareawithanotherSmallSiteBMP.Thedisturbedlandscapedareaswillhavetheirsoilsamendedtoadepthtovkofatleast8-inches.iV\i€ricIntent:Toensureproperdesignandconstructionofengineeredconveyancesystemelements.Conveyancesystemsarenaturalandengineereddrainagefacilitiesthatcollect,contain,andprovidefortheflowofsurfaceandstormwater.Thiscorerequirementappliestotheengineeredelementsofconveyancesystems—primarilypipes,culverts,andditches/channels.Response:LiCATibFipeSystems:ittfCIlTheproposedconveyancesystemiscomprisedofroofdownspoutpipes/Theconveyancesystemissizedtoconveythe100-yeardevelopedpeakflowasdeterminedbyKRCTS,andanalyzedusingLDD’sManningCalculatorinSection5.0ofthisreport.Culverts:Therearenoproposedculvertsforthisdevelopment.Ditches/channels:Therearenoproposedditchesforthisdevelopment.P:\14038.0\Reports\Storm\Monteira.TIR.doc Response:ATemporaryErosionandSedimentationControl(TESC)PlanhasbeenpreparedaspartoftheConstructionPlans.TheTESCPlanwillpreventthetransportofsedimenttostreams,wetlands,lakes,drainagesystems,andadjacentpropertiesinaccordancewithalltheapplicablestandardsoftheKCWSWDMandtheCityofRenton.CoreRequirementNo.6:MaintenanceandOperationsIntent:Toensurethatthemaintenanceresponsibilityfordrainagefacilitiesisclearlyassignedandthatthesefacilitieswillbeproperlymaintainedandoperatedinperpetuity.Response:Theonsitestormwatercomponentswillbelocatedwithinprivateproperty.SeeSection10.0formaintenancestandardsfortheprivatelymaintaineddrainagecomponents.STo/Mh\tLJC1Td1LBMfCDVW41JTo*iO.1NCW.CoreRequirenientNo.7:FinancialGuaranteesmidLiabilitykTH7tTIntent:Toensurefinancialguaranteesarepostedtosufficientlycoverthecostofcorrecting,ifnecessary,incompleteorsubstandarddrainagefacilityconstructionwork,andtowarrantfortwoyearsthesatisfactoryperformanceandmaintenanceofthosenewlyconstructeddrainagefacilities.CoreRequirement#7isalsointendedtoensurethataliabilitypolicyisprovidedthatprotectstheproponentandtheCityfromanydamagesrelatingtotheconstructionormaintenanceofrequireddrainagefacilitiesbyprivateparties.Response:BondQuantitiesareincludedinSection9.0.CoreRequirementNo.8:WaterQualityIntent:Torequireanefficient,cost-effectivelevelofwaterqualitytreatmenttailoredtotheçcsensitivitiesandresourceprotectionneedsofthedownstreamreceivingwatertowhichtheprojectsitedrains,or,inthecaseofinfiltrationrotectionofthereceivinggroundwatersystem.Response:Theprojectproposes1,948sq.ft.ofnewpollutionimpervioussurfacesGIS),and5,004q.ft.ofpollutiongeneratingpervioussurfaces(PGPS).Additionallytheseareasarenotcontrolledwithfulldispersion;therefore,theprojectisexemptfromthiscorerequirementperExemption#1.j_._.2.2AnalysisofSpecialRequirementsSpecialRequirementNo.1:OtherAdoptectArea-SpecificRequirementsResponse:Thefollowingisalistofotherpossibleadoptedarea-specificrequirementsaccordingtotheManual:Page21P:\14038.0\Reports\Storm\Monterra.TIR.doc MasterDrainagePlan—Theareaisnotpartofamasterdrainageplan.BasinPlans—ThissiteislocatedwithintheCedarRiver/Lake‘Washingtondrainagebasin.Noadditionalrequirementshavebeenidentified.SalmonConservationPlan—ThesiteislocatedwithintheWRIA$ChinookSalmonConservationPlanArea.Noadditionalrequirementsapply.floodHazardReductionPlanUpdates—ThisprojectdoesnotappeartobewithinaFloodHazardArea;therefore,thisplandoesnotapply.SharedFacilityDrainagePlan—Theprojectdoesnotproposetoconnecttoashareddetentionfacilitysystemorcreateasharedfacility;therefore,thisplandoesnotapply.SpecialRequirementNo.2:floodHazardAreaDelineationResponse:Theproposedsiteisnotlocatedwithinthe100-yearfloodplainorfloodhazardarea.SeeincludedFEMAmapwithinSection3.0ofthisreport.SpecialRequirementNo.3:floodProtectionFacilitiesResponse:SpecialRequirementNo.3isnotapplicabletotheproposedsitesincethesitewillnotaffectanyexistingfloodprotectionfacilities.SpecialRequirementNo.4:SourceControlResponse:SpecialRequirementNo.4onlyappliestocommercialsitedevelopmentpermits.Sincethissiteisamulti-familyresidential,thisrequirementdoesnotapply.SpecialRequirementNo.5:OilControlResponse:SpecialRequirementNo.5doesnotapplytothesitesinceitisnotclassifiedasahigh-usesite.SpecialRequirementNo.6:AquiferProtectionAreaResponse:TheprojectisnotlocatedwithineitherZoneIorZone2;therefore,thisrequirementdoesnotapply.Page22P:\14038.0\Reports\Storm\Monterra.TIR.doc 3.0OFF-SITEANALYSIS3.1StudyArcaDefinitionandMapsTheCityofRentonrequiresasummaryoftheupstreamdrainagebasin,anda1-miledownstreamdrainageanalysis.ThepropertyislocatedonthewestsideofSunsetBlvdNEandsouthoftheintersectionofAberdeenAve.NE.Multi-familydevelopmentsarelocatedtothenorth,southandwest.Totheeastaresingle-familypropertiesacrossSunsetBlvdNE.RunoffupstreamoftheprojectsiteiscollectedwithinSunsetBlvdNE’sright-of-waybycurbandgutter.Oncetherunoffisinthegutterit’scollectedbyexistingcatchbasinsapproximately150-feetsouthand190-feetnorthoftheprojectsiteinSunsetBlvd.NE,andAberdeenAveNErespectively;erIIpstmasbsstlprojtt.Theprojectproposestoinfiltrateitsrooftopareas.Thereminderofthesiteisallowedtoshedtothewestwhereitiscollectbytheneighboringapartment’scollectionsystem.AnOffsiteDrainageAnalysisMapisincludedinthissection.3.2ResourceReview•AdoptedBasinPlans:ThissiteislocatedwithintheCedarRiver/LakeWashingtondrainagebasin.AccordingtotheCity’sG1SMapViewerthesiteistributarytoJohnsCreek,andultimatelyLakeWashington.•FloodplainandFloodwayFEMAMaps:PertheFEMAPanel977of1725ofmapnumber53033C0977fthesiteislocatedinZoneXandisnotlocatedwithinthe100-yearfloodplain.PleaseseetheFEMAmapwithinthissection.•OffsiteAnalysisReport:Nootheroffsiteanalysisreportswerelocated.•SensitiveAreasFolios:BasedonareviewoftheRentonandKingCountySensitiveAreasMaps,itwasfoundthatthesubjectsitedoesnotcontainanyseismichazards,floodhazards,iswithinanaquaferprotectionzone,orcoalmines.However,theprojectsiteislocatedwithinandadjacenttoahigherosionandlandslidehazardzones.•UnitedStatesDepartmentofAgricultureKingCountySoilsSurvey:Basedonthesoilsmapforthisarea,theentiresiteislocatedwithinRagnar-Indianolaassociation,sloping(RUC).Ragnarsoilsaretypicallyunderlinebyashyfinesandyloam0to27-inchesthentoloamysandstoadepthof60-inches.IndianolasoilsarePageI23P:\14038.0\Reports\Storm\Monterra.TIR.doc typicallyunderlinebyloamyfinesands0to30-inchesthentosandstoadepthof60-inches.ThesesoilsareclassifiedastypeA/Bandareeitherwelldrainedtosomewhatexcessivelydrained.•WetlandsInventoryMaps:BasedonareviewoftheRentonandKingCountymapstherearenoonsiteoradjacentoffsitewetlands.•WashingtonStateDOEListofPollutedWaters:Therearenopollutedwaterswithin1-mileoftheprojectsite.•ErosionandLandslideMaps:Aspreviouslymentionthesiteislocatedwithinandadjacenttoahigherosionandlandslidehazardarea.3.3FieldInspectionThesitewasvisitedonNovember25,2015.Itwasasunnydayafteraprolongedperiodofhighwindsandrain.ThedownstreamdrainagepathwaswalkedandwhatwasdiscoveredisrecordedintheOffsiteAnalysisDrainageSystemTablewhichisincludedwiththissectionforreference.Noseriousdrainageproblemswereobserved;although,atype2catchbasinattheendofacrossculvertunderInterstate405hassignsofpossib]esurcharging.3.4DrainageSystemDescriptionandProblemDescriptionsTheprojectsiteslopesfromeasttowestatanapproximaterateof10%.Whatrunoffthatisn’tinfiltratedonsitecontinueswesterlyoverlandfor380-feetontothepropertytothesouth(parcelnumber3119900050).Thispropertyhasaclosedconveyancesystemconsistingofatleast2catchbasinsinitsnortherndriveaisle.fromthispropertytherunoffcontinueswestforanother260-feetoveraPugetSoundEnergytransmissionlinetract,andintotheInterstate405’sditchsystem.Therunoffcontinuesnorthwithintheditchforapproximately190-feetwhereitisconveyedunderthefreewaybya24-inchcorrugatedmetalculvertpipe.FromthisculverttherunoffcontinuesintoHouserWayNwithaType2catchbasin.ThiscatchbasinpossiblysurchargingintoashortditchalongHouserWayNwhereitisinterceptedbya12-inchconcreteculvertpipe.Thisstructurecouldbeabubbler,butitcouldnotdefinitivelybedeterminedassuch.ThegroundsurroundingitismoistandsoftwithsomestormwatertricklingoverthetopbackofthecurbandintoHouserWayN.Onceinthe24-inchconcreteculvertthestormwaterisconveyedfor1,200-feettotheintersectionofNgthSt.OncetherunoffisinNgthSttherunoffflowswestintoa36-inchdiameterstormsystemforanother1,070-feettotheintersectionofGardenAveN.TheremainderoftheonemiledrainagepathendsnorthattheintersectionofGardenAveNandLkWashBlvdN.AtthisintersectionthestormwaterfromtheareadischargesPage24P:\14038.0\Reports\Storm\Monterra.TIR.doc toanopenchannelviaa72-inchcorrugatedmetalpipeonthenorthsideofLkWashBlvdN.fromheretherunoffisconveyednorthtowardslakeWashingtonwithaseriesoflargediameterconcreteculvertpipes.TheultimatedischargelocationforrunofffromtheprojectsiteisLakeWashingtonattheGeneCoulonMemorialBeachPark.AnOffsiteAnalysisDrainageSystemTableisincludedwithinthissectionforreference.3.5MitigationofExistingorPotentialProblemsTherearenoexistingproblemsthatneedmitigationduetotheconstructionofthisproject.Theprojectproposestouselimitedinfiltrationtocontrolitsproposedrooftops,andamendedsoilsforthefuturelandscapedareas.AnypotentialproblemsthisprojectcouldaggravatedownstreamaremitigatedwiththeuseoftheseSmallSiteBMPs.Page25P:\l4038.0\Reports\Storm\Monterra.TIR.doc Figure3.1—FEMAMapPage26P:\14038.0\Reports\Storrn\Monterra.TIR.doc r-r—-‘Cc:lD2—_-———-LLt_;LC-S=;:;c£C1-0—C.// Figure3.2—SensitiveAreasMapPageI28P:\1403$.0\Reports\Storm\Monterra.TIR.doc %G(,•,o19 949h e b 901 0 357 -. 15 411 K:c!±Q%2u nty iMap •{%2203 i 2 •!- 9S 4.£ 221 31 r 2220 2300 2308%Z62a b ,b‘ft J I 215 .i23 o&;;07 — - . 2310 j57 I F50 —.... •4- *909 * 16 •: t9W •2 Kingounty GIS CENTER )65 4” 24.05 I 964 252O 95’_4 10.1 — ..-,,—93I1T044 L...1 J25219$..... -‘i’2213 2313%?*‘•‘e•b 0 ••0J:190 I ,. 2ij1 242OJ .423 24.%4 —.LtF ._.400 —8.861\ç..825 ‘82S’* •‘0 B%1 /a 4S21 821r 1- $54 2104 712 •H 85?451 v317 “IT r; J14 JGI JOO .59 *1* 01 •tS t11 %1% a ‘$11 441\\ r 01 •.•I$O722O.o4 O3 •—a J?c1-41e111‘*02301r2 •ParkbL,302 J5::_75 64 771 Rento --‘j.751 40‘2107 -j50iac••*‘21 2215 S •4Th5 •:•r --I p754 j%042105—.L •L •0’,bj1.0 ‘-‘*4 1•\I */0/221 -‘:‘‘,691 ,475 d 21i3 - J82 . 4 1n-,wi r,r ‘lv m:4 H’“4i1 ‘‘ii Ir L,’N •‘•,4.,4.4’ri 11I.+,&—.‘,:1-’’i nil”’I1rs r rhirqrl4r.11.101141 ‘1l:l,’s..414 ‘4.It 4.i.,WI1 I,ri r 1,1 .‘‘i—’,11’’’.,‘iji’i It lr4,n,‘11 i’’:4tM’1’,4’4*l4 141 4’;Li lOll’0 1’*‘44 41i 411 ‘l4 ‘.4 “14 ‘i ‘I”11)11 {1i4 4144 çtf’441 4)4’1l,Cl’rll’,I I d.k’,‘l,ill 1.I,.q ,r,!Il,I l140ll0:4’.I,.IIllll1,4Ij4 I’ll IIIIIHI,C414 t,oi.,,r •;4 11 (I illuill 1’Ii,•,llnr,Ir;rl ‘llIlI ‘—41’N.‘.n &h,‘‘u.;ii I.:’’lIi’u_i,il II .,:1:111 ‘1,“lI’I tr1r41”l ii ti 4.i,z 11.4414, 1)4I4 Z2’’6 Figure3.3—OffsiteAnalysisDrainageSystemTablePageI30P:\14038.0\Reports\Storrn\Monterra.TIR.doc 7=7-j Figure3.4—DownstreamAnalysisMapPageI32P:\14038.0\Reports\Storm\Monterra.TIR.doc City of Renton Print map Template 1 1 , 4-4S’COP Towards Lake A’ashington to the North, (1S S 1 TTT 11 5111 j (5)72”CMP Outfall.End of 1 Mile L Downstrea9l Drainage Path .5 y5 - ,:. ‘.1 r L Downstream Drainage .4 .5’ 1.I\ %,,‘‘,. Lh. 4’ 1)PVT Drainage System 1’ ‘2 U 9,. ‘I (4)EX-CB Typ1713/L —_JRISt&3 Cflfl PIn flHt ‘a ... 4.0STORMWATERANALYSISANDDESIGN4.1ExistingSiteHydrologyTheexistingsiteis,generally,rectangularinshape,coveredwithsometrees,brushandblackberries.Thesiteslopesfromeasttowestatanapproximaterateof10%.Thereisanexistingpaveddrivewayonsitetoaccessthepropertytothewest.TheonsitesoilsareRagnarIndianolaassociation,sloping(RdC)whichisclassifiedasanoutwashsoil.APre-DevelopedBasinMapisincludedSection1ofthisreport.AccordingtoReference11-AoftheCity’samendmentstotheManualthesiterequiresaPeakRateFlowControlStandard,rnatchingstingjteconditionsrunoffrateforthefull2,10,and100-yearpeakrates,detentionisusedtomitigateitsrunoff)Thepre-developedpeakforthesitecre)areasfollows(fromKCRTSoutput):Q20.021-cfsQio0.026-cfsQ250.031-cfsQioo0.041-cfs4.2DevelopedSiteHydrologyLimitsofsitedisturbancewillincludeinstallationofsedimentanderosioncontrolBManagementPractices(EMPs),constructionoffrontageimprovements,driveways,walkways,infiltrationtrenches,utilities,landscapingand5townhomes.frontageimprovementsincludecurb,gutter,8-footplanterand8-footsidewalkonthewesternsideofSunsetBlvdNE.Thetotaldisturbedareawillcoverapproximately0.2$acresbothonsiteandoffe+Uponcompletionoftheproject,impervioussurfscoesieincludeapproximately0.07-acreofdriveways/pathways,and0.09-acreofnewrooftops.Theproposedinfiltrationtrenchesaresizedtoinfiltratetherooftopareasonly.Therooftopareaistributarytotwoparallelofinfiltrationtrenches.Thesetrenchesaresizetoinfiltratealltherooftoparea.TheI5-minutedeveopepeakflowsfortherooftopbasinareasfollows(fromtheKCRTScomputerprogram):PageI34P:\1403$.0\Reports\Storm\Monterra.TIR.doc Q2—0.041cfsQio0.056cfsQ25”0.078cfsQioo=0.103cfs4.3PerformanceStandardsAccordingtoFigure5.2.l.Aforlotslessthan22,000sq.ft.thesitemustevatfullinfiltrationandifneitherofthoseBMPsarefeasiblethenatleast20%ofthesitemustbecontrolledwithanotherSmallSiteBMP.Thesitedoesnothavetheproperflowpathsandsoilsforeitherfulldispersionorinfiltration,buttheonsitesoilsaresufficientforlimitedinfiltration.Y.)Theproject’srooftopsaremitigatedwithinfiltrationtrenchespei(tedinfiltrationSectionC.2.3ofAppendixCoftheManual,whichisgreaterthan20%ofthesitearea(20%ofsitearea=2,564sq.ft.rooftoparea=3795sq.ft.).Alldisturbedfuturelandscapedareasshallhavetheirsoilsamendedtoaminimumdepthof8-inchespertheManual.4.4FlowControlSystemAspreviouslymentioned,theproject’srooftopsaremitigatedwithinfiltrationtrenches.ThesetrenchesaresizedperSectionC.2.3andthegeotechnicalengineer’sreportwhichdiscoveredfinesands;therefore,thetrenchsizingratiois75-feetlongby2-feetminimumwide(150sq.ft.)per1,000sq.ft.oftributaryimpervioussurfaces.Themaximumtrenchlengthis100-feet,andeachtrenchcentershallbenocloserthan6-feet.Thetrenchissizedtoinfiltratealltherooftopareabeingconstructed.Theprojectproposes3,795sq.ft.(0.087acres)ofnewroofareas.Thisareaexceeds20%ofthesite(12,819sq.ft.*20%=2,564sq.ft.);therefore,nootherBMPsarerequiredperFigure5.2.1.AoftheManual.Trenchsizingcalculationsareasfollows:RooftopArea:3,795sq.ft.SizingRatio:150sq.ft.trenchbottomareaper1,000sq.ft.oftributaryimperviousarea.Calculation:150sq.ft./l,000sq.ft.*3,795sq.ft.569sq.ft.trenchbottomarearequired.ForbasindelineationpleaserefertotheDevelopedBasinMapinSection1ofthisreport.çzMCj4)to,ucc-flLPage35P:\14038.0\Reports\Storm\Monterra.TIR.doc Provided:two4$-feetlongby6-feetwideby2-feetdeepinfiltrationtrenches.(2*4$feet*6_feet=576sq.ft.);therefore,theprovidedtrenchisadequate.4.5WaterQualitySystemLék1€1ff.STheprojectproposes1,948sq..ofnewPGISand5,004sq.ft.PGPS.TheprojectdoesnotexceedthresholdsforwaterqualitytreatmentperExemption#1asdescribedinSection1.2.8oftheKCSWDM.PageI36P:\1403$.0\Reports\Storm\Monterra.TIR.doc VI3ifTLtoSff7IFigure4.1—KRCTSOutputsPage37P:\14038.0\Reports\Storrn\Monterra.TIR.doc MotftCtriRoofC1c.PKSF1oiFrequencyAnalysisTimeSeriesFiie:rnonterratc’oIcak.tsfPrüjectLocation:Sea-Tac---AnnualPeakFlowRates------ --FfoFrequenryAnalysisnowRateRankTimeofPeak-Peaks-RankReLLlf’nProb(CFS)(CF5)Period0134168/27/13118:13130.1031100.0013.980.02989/17/0217:450.078225.000.9600078212/:138/0217:150.056310.000,00013.133378/23/0414:3013.04%4S.0(30.80013.0445113/28/0416:008.04453.0013.6670.0i6410/27/0510:450.04162.000.5000.056310/25/0622:4513.133371,360.2310.10311/09/086:300.02981.100.091ComputedPeaks0.09550.000.980.()Page MonterraPteDev.pksFlowFrequencyAnalysisTimeSeriesFile:monterrapredev.tsfProjectLocation:Sea-Tac---AnnualFlowRate(CFS)0.0210.0190.0260.0210.0260.0230.0310.04172/09/0181/05/02312/08/0268/26/04410/28/0451/18/06210/26/0611/09/082:0016:0018:002:0016:0016:000:006:00PeakFlowRates---RankTimeofPeakFlowFrequencyAnalysis--Peaks--RankReturnProb(CFS)Period0.0411100.000.9900.031225.000.9600.026310.000.9000.02645.000.8000.02353.000.6670.02162.000.5000.02171.300.2310.01981.100.0910.03850.000.980ComputedPeaksrPage1 5.0CONVEYANCESYSTEMANALYSISANDDESIGNStormwaterfromtheproposedrooftopsarecollectedandconveyedtotwoinfiltrationtrenches.TheconveyancesystemupstreamofthetrenchesissizedperManning’sEquation.The100yearflowrate(0.1O3cfs)asdeterminedbyKRCTSstorrnwatermodelisusedtosizetheconveyancesystem.Theminimumpipediameter,materialtypeandslopeisasfollows:6-inchADSN-I2at0.50percent.TheminimumpipeslopepertheCityofRentonrequirementsis0.5percent.UsingLDD’sManningCalculator,aManningsCoefficient(n)of0.012andtheaforementionedpipeparameterresultsinafullflowrateof0.43cfs;therefore,theproposedsystemhassufficientcapacitytoconveytheI00-year,I5minuteflowrate.Page40P:\1403$.0\Reports\Storm\Monterra.TIR.doc Figure5.1—LDDComputerOutputPageI41P:\14038.0\Reports\Storrn\Monterra.TIR.doc RoofDownspout199Yeartalc.txtManningPipeCalculatorGivenInputData:Shape.............SolvingforDiameter...•4••DepthSlope.Manningesn..Cotq,utedReu1ts:Flowrate...................Area.WettedAreaWettedPerimeter.....Perimeter...4Velocity.....................HydraulicRadius...PercentlullFullflowflowrateFullflowvelocityCriticalInformationCriticaldepth—..............Criticalslope.......1••••CriticalvelocityCriticalareaCriticalpeimeterCriticalhydraulicradius....CriticaltopwidthSpecificenergy•.........Minaaumenergy.•••••••a.••—Froudenumber..........Flowcondition......CircularIlownite0.5000ft05080fte.eoseft/ft0.01200.4298cfs9.1963ftZ9.1963it;1.5708ft1.5708ft2.1293fps0.1250ft180.0000%0.4298cfs2.1891fps0.3965ft0.8084ft/ft3.5483fps0.1714ft21.0783ft0.1590ft03800ft0.6154ft0.5947ft0.7191SubcriticalPageL,2 6.0SPECIALREPORTSANDSTUDIES•GeotechnicalReport,preparedbyENSWdatedDecember10,2015.Page43P:\1403$.0\Reports\Storm\Monterra.TIR.doc Figure6.1—GeotechnicalEngineer’sReportPageI44P:\14038.0\Reports\Storrn\Monterra.TIR.doc “4:%‘IthPiacNEritc%OI*i3qL425i44947t)4a42c41471Cr1gS&UtJGflsIW4Orn- --i;:‘CtecIii;d1GeoloEnvironrncntalScintistCuiisruuIunIni1riaL—J-VF.*-IL-’:.4t-U--—‘—‘-———-GEOTECHNICALENGINEERINGSTUDY•--MONTERRATOWNHOMES-905-SUNSETBOULEVARDNORTHEAST’.RENTON,WASHiNGTONES-3622 PREPAREDFORPOOLBROTHERSCONSTRUCT!ONNOVEMBER23,2U15REVISEDDECEMBER10,2015-•:HenryT:wigI-t,EJ.T.ProjectEngineerPrincipal/IGEOTECHNICALENGINEERINGSTUDYMONTERRATOWNHOMES905-SUNSETBOULEVARDNORTHEASTRENTON,WASHINGTONE$-3622EarthSolutionsNW,LLC1805—136thPlaceNortheast,Suite201Rellevue,Washington98005Ph:425-449-4706Fax:425-449-4711TollFree:S6-33G-8710RaymondA.Coglas,PE. — n = - — —, ‘çtj — - - -r -K L - L —: F i .- —_. .4 ;‘ _____ EI fl-s 1; •;:p ‘-‘5 .2’ :t . sits ‘ 54) ‘1 -7 C - ca a cn r sL),—-,,CDCUY’: H rccçH tt&p ‘‘c.HO75 ,.:3 it ‘‘),&R vsEL-,:7 7’-H nHi —2 ,-J -t ‘ —— — C air;Y’ 7-a s:t - ‘H c.t.‘7 :-,‘.5 ;1 US ‘ —n-s -r --, “L ;:s_9_—‘: .5 :3% 7-tl 5-75 -, H 2. :‘- -r “-t H IL =CS Ste. 7?.4 ,‘° ;;]_-‘i:z S.,—., 7 SI —.—--2H5---,-77S’7---”•.74 -_>0—-it, -7 Zr7’-5 .C, -E ‘-tt -7 .--;.::- S H -‘H35 -7 E!y :-‘‘5--i ‘7;7-55 53 -17 ‘-s.;7; E.s ‘9 1),7’i :7 --3 5! ‘7 F:5’’ ‘7--4 L.,:, ;1 -E, 75 ‘4 41<7 ‘•51 2 r a 77 -, -1 7 7 5-ci7.7- 5’ 7 9 ‘7 7; 7: 5-4 5 4— ‘c Cl. •2 --Si, ‘H,4 7- 5 5; -LI “-5 fl: :1--‘3 7- ‘U S.a4-- H C’ u1 25á)ufloniNovember23.2015RevisedDecember10,2015EUthflSNWLLLES-3622I•••‘r’HPoolBrothersConstruction720North10Street,#A105Renton,Washington98501Attentjn:Mr.DavePoolDearMr.PooLEarthSolutionsNW,LLC(ESNW)ispleasedtopresentthisreporttitled‘GeotechnicatEngineeringStudy,MonterraTownhomes,905-SunsetBoulevardNortheast,Renton,Washngton’.Inouropfr’ion,developmentandconstructionoftheproposedmulti-familyresidentialdevelopmentisfeasiblefromageotechncalstandpoint.Followingsitepreparationandgradingactivities,theproposedbuildingstructurecanbesupportedonconventionalfoundationsbearingoncompetentnativesoil,recompactednativesoilornewstructuralfill,Ingeneral,competentnativesoilsuitableforsupportoffoundationseiEllikelybeencounteredbetweendepthsofapproximatelytwotothreefeetbelowexistinggrades.Recommendationsforsitepreparationandretatedearthworkactivity,structuralfillplacement,foundationandretainingwaildesignsubsurfacedrainage,andotherpertinentgeotechnicalrecommendationsareprovidedinthisstudy.Weappreciate[heopportunitytobeofservicetoyouonthisproject.11youhaveanyquestionsregardingthecontentofthisgeotochnicelengineeringstudy,pleasecall.ncerely,EARTHSOLUTIQNSNW,LLC/44444HenryTAdfIOhtElTProjectEngineer- ‘ , ;‘,--••--:, .,r-””.‘4,_‘ TableofContentsES-3622PAGEINTRODUCTIONIalProiecescnption2SITECONDITIONS2Surface2Subsurface2Topsoil3Fill3NativeSoIls3GeologtcSettingV3Groundwater3INFILTRATIONEVALUATION4InfiltrationRecommendations4DISCUSSIONAND.RECOMMENDATINS.,4General4SitePreparationandGeneralEarthwork5TemporaryErosionControl5Stripping.5InsituSoils5ImportedSoils6SubgradePreparation6StructuralFill6FoundationsV 6SeismicDesicin7Slab-OnGradeFloors7RetainingWalls7Drainaqe8ExcavationsandStones9PavementSections9UtilitySupportandTrenchackfiIl10LIMITATIONS10AdditionalSeMces10FirthhIDsNW,tC TableofContent.ConrdE84622ØBAPHICSPitt.IVicinityMapFIats2TestPitLocationManFlat.3RetainingWailDrainageDetailP1.64FootIngDrainDetailPEWDlCESAppendixASubsurfaceExplomifonTestPItLogsAppendixBLabomtoiyTestResult.SieveAnalysisResutteFwthSddbeNW.UtSI GEOTECHNICALENGINEERINGSTUDYMONIERRATOWNHOMES90S—SUNSETBOULEVARDNORTHEASTRENTQNWASHINGTONCES-3622TKDN-çoGeneralThisgeotechnicalenneeringstudywaspreparedforthefive-plex,three-storytowohomestoheconstructedonthewestsideofSunsetBoulevardNortheastneartheintersectionwithNortheastStreetinRenton,Washington.Thepurposeofthisstudywastoperforml1subsurfaceexplorationsacrossaccessibleportionsofthesite,conductappropriateanalyses,j4andpreparegeotechnicalrecommendationsforTheproposeddev&opmentOurscopeofservicesforcompletingthisgeotechnicienginooringstudyaddressedIlefollowing:Preparingasitegeologicdescriptionincludingsoilandgroundwaterconditionsthatmayimpactsitedevelopment;•Providingaproject-specificrecommendationsregardingsitegrading,drainage,structuralfillrequirements,erosioncontrol,recommendedpavementsections;Providingsoilbearingcapacity,subgradepreparation,andotherpertirentrecommendationsforfoundationsupport;•PreparinganassessmentofthesuitabilityofthesitesoilsforuseasstructuralflU;•FreparingapreliminaryinfiLtrationevaluationtoprovidedesigninfiltrationrates,and;•Providingadditionalgeotechnicalrecommendations,asapproprfate.Thefollowingdocumentsandmapswerereviewedaspartofourreportprepatation:•OnlineWebSoilSurvey(WSS)resourcemaintainedbytheUnitedStatesDepartmentofAgriculture(USDA),NaturalResourcesConservationService;aGeologicMapofTheRentonQuadranglecompiledby0R.Mullineaux,dated1965;ConceptualSitePlan,hyCE.S.NWlnc,datedOctober21,2014;and200UKingCountySurfaceWaterDesignManualtRenton) PoolBrothersConstructionE$3822November23,2015Pane2RevisedDecember10,2015ProjectDescriptionWeunderstandthatthesubjectsitewiflberedevelopedwithnewtownhomesandassociatedimprovements.TheproposeddevelopmentwillincludeconstructionofonestructurewithatotalofliveunrtsandassociatedimprovementsIheproposedbuildingwilllikelybethreestoriesinheightandconstructedutilizingr&ativ&ylightlyloadedwoodfraniingsupportedonconventionalfoundations.Finalbuildingloadswerenotavailableatthetimeofthisreport.basedonourexperiencewithsimilarprojects,weanticipateperimeterfootingloadsontheorderof1to2kipsperlinealfoot(ku)foreachstructuralstory.Slabongradeloadingisanticipatedtobeontheorderof150poundspetsquarefoot(psf).Basedontheexistingtopography,gradingwillberelativelyminimal,andwilllikelyrequirecutsandfillsoflessthanthreefeettoachievefinishfloorelevations.Astormwatetretention/detentionfacility_willbelocatedonthenorthsideofthebuildingwhichwiIflThtra1esurtacoffintothenativesoiLTheremainderofthesitewillbedevelopedwithgenerallandscapingandpavedwalkways.Iftheabovedesignassumptionsareincorrectorchange,ESNWshouldbecontactedtoreviewtherecommendationsinthisreportESNWchouldreviewthe[matdesigntoverifythatourgeotechnicalrecommendationshavebeenincorporated-SITECONDITIONSSuraceThesiteislocatedalongthewestsidoofSunsetBoulevardNortheastneartheintersec1onwith9thStreetinRenton,Washington.TheapproximatelocationofthepropertyisillustratedonplateI(VicinityMap)Thesiteraroughlyrectangularinshapeandconsistsofonetaxparcel(KingCountyParcelNo.311990-0051)totalingapproximately029acres.ThesubjectsiteisborderedtotheeastbySunsetBoulevardNortheastandprivatepropertiestothewest,north,andsouthTheoverallsitetopographyisrelativelylevel,withlittlediscernibleelevationchangeThemajorityofthesiteisoccupiedbyvegetationwithareasofbramblesandtrees.SubsurfaceAnESNWrepresentativeobserved,logged,andsampledfourtestpitsonOctober14,2015excavatedataccessiblelocationswithinthepropertyusinganiini-trackhoeandoperatorretainedbyourfirm.Thetestpitswerecompletedforpurposesofassessingsoilconditions,classifyingsitesoils,andcharacterizingsubsurtacegroundwaterconditionswithintheproposeddevelopmentarea.E-tSutnsNV,tiC PoolBrothersConstrucfjcnS-3S22November23,20153RevisedDecember10,2015TheapproximatelocationsofthetestpitsaredepictedonRate2(TestPitLocationPlan)PleaserefertothetestpitbgsprovidedinAppendixAformoredetaileddescriptionofsubsurfaceCDflditiQflSTopsoilTopsoilwasobservedintheupperapproximately6toabout12inchesofexistinggrades.Topsoitwascharacterizedbydarkbrowncolor,thepresenceoffineorganicmaterial,andsmallrootintrusionsTopsoilisnotsuitableforuseasstructuralfillnorshoulditbemixedwithmaterialtobeusedasstructuralfillTopsoilorotherwiseunsuitablematenalcanbeusedinlandscapeareasifdesired.NHFillwasencounteredduringourfieldworkattestpitlocationsTP-1andTP-2,Thefillrangedfromtheexistinggroundelevationtoadepthofone-and-one-halffeet.Thefillprimarilyconsistedofloose&ltysands(UnifiedSoilClassification,SM)inadampcondition.LocalizedareasoffitlmayheencounteredthroughoutthesiteWhereencounteredfillshouldbeobservedbyESNWatthetimeofconstructioninordertoassessthesuitabilityforuseasstructuralfill.NativeSoilsUnderlyingtopsoilandfill,thenativesoilswereencounteredconsistingprimarilyofmediumdensetodensesiltysandwithgravel(UnifiedSailClassificationSystemSM),consistentwithoutwashandglacialtilltransitionaldepositsUSDAtexturalclassifirationidentifredthesesoiltypesasfinesandloamysandandsandyloamNativesoilswereencounteredpnmanlyinadamptomoistconditionandextendedtothemaximumexplorationdepthofnine-and-one-halffeetbelowexistinggrades.GeologicSettingThereferencedgeologicmapresourceidentifiesgroundmorainedepositsforthesubjectsiteandimmediatelysurrounarngareaiAsdescribedontheqeologicmapgroundmorainedepositstypicallyconsistsoflodgmenttill,depositedbythePugetglaciallobe.Lodgmenttillisgenerallycomprisednfcompartunsortedrnxtureofsandsilt,clayandgiavelAdditionallythereferencedWSSresourceidentifiesRagnar-Indianolasoils(mapunitRUG)acrossthesiteandsurroundingareas.Thesoilconditionsenc..ounteredat-depthduringourfieldworkworcgenerallyconsistentwithlodgmenttillwithlocalizedareasofoutwashlndianolasoils.GroundwaterGroundwaterseepagewasnotobservedatthelimeofourfieldwork(October14,2015).Wedonotanticipateheavygroundwaterseepageinthemajorityofthesiteexcavations,exceptpossiblyindeeperutilityexcavations.Groundwaterseepageratesandelevationsfluctuatedependingonmanyfactors,includingprecipitationdurationandintensity,thetimeofyear.andsoilconditions.Ingeneral,groundwaterflowratesarehigherduringthewetter,wintermonthsrthSrlulnn’t’W,tCC PoolBrothersConstruchon[3-3622Novcrnber23.2015pa4RevisedDecember10,2015INFILTRATLONEVALUATiONAspertofourstudy,weperformedaninfiftrtonevauatbnfortheproposedinfiltreitionfacIties.WeunderstandthestormdrawagefortheproposedprojectwibedesignedusngAppendixCofIhe2OOKingCountySurtaeWaterDesignt1nu&(KCSWDM).VVeunderstandimitednfi1trationusingintlltraUonttenc1swi1bincorporatedintoLtoveraistormdrainagedesign.InfiltrationRecommendationsThesoilsencounteredwithintheproposedinfiltrationtrencharea(testpitlocationTP1)andattheproposedinfiltrationtrenchdepth(approximately4feet)generallyconsistofslightlygravellyfinesand(USDAclasstficahon)withloamycjfçt5encounteredatUepthandElewhereonsite.Basedonthesoilandgroundwaterconditionsobservedatthetestpittocations,werecommendtheinfiltrationtrenchesshouldhesizedingeneralaccordancewithSectionC23.3ofAppendixCofthe2009KcSWDMTheinfiltrationdesignrecommendationassumesinfiltrationwithinthemoreFavorableoutwashfindsandsoilsidcntiftdwithinthenortherlyportionsofthesiteIfthetoctionofTheproposedinfelttatonischanged,ESNWshouldreviewtheinftratiandesignrecommendationWealsorccomrnendmoororatinanemeiccncyovediowprovisionintenfiltrttonsysemdesignasplashblockoverflowwithpositivedrainageawayfromthebuildingwillbeufficint,ThesolandgroundwaterconditionsshouldbeconfirmedbyESNWatthetimeofconstruction,DISCUSSIONANDRECOMMENDATIONSGeneralBasedontheresultsofourstudy,constructionoftownhomcsatthesiteisfeasiblefromageotechnicalstandpointTheptimryqro1echnicalconsiderationsassociatedwiththeproposeddevelopmentincludefoundationsupport,sIab-ongradcsubgradesupport,andminimizingpost-constructionsettlements.Basedontheresultsofourstudy,theproposedbuildingstructurecanbesupportedonconventionalspreadandcontinuousfootingshearingonundisturbed,competentnativesoil,recompactednativesoilornewstructuralfill.Basedonourunderstandingoftheproposeddevelopmentcompetentnativesoilssuitabeforsupportoffoundationshouldbeencounteredatdepthsofbetweenapproximatelytwotothreefeetbelowexistinggrade.Wherelooseorunsuitablesoilconditionsareexposedatfoundationsubgradeelevations,compactionofthesoilstothespecificationsofstructuralfilloroverexcavatianandreplacementwithisutabtestructuralfillmaterial,willbenecessary.ThisstudyhasbeenpreparedfortheexclusiveuseofPoolBrothersConstruction,andthererepresentatives.Nowarranty,expressedorimphed,ismade,Thisstudyhasbeenpreparedinamannerconsistentwiththelevelofcareandskillofdinanlyexercisedbyothermembersoftheprofessioncuirentlypracticingundersimilarconditionsinthisarea.SiinM,L.C PoolBrothersConstructionES-%e22November23,2015Page5RevisedDecember10,2015SItePreparationandEarthworkSitepreparationactivitieswiHincludeinstaflingtemporaryerosioncontrolmeasures,establishinggradinglimits,andperformingsitestrippingandclearing.TemporaryErosionControtThereferencedsiteplanindicatesegresswillheprovidedtothjntiatlotfrotreetNortheastPncrtofinshqradinqandavtng,temporarycanattuoneniancesanddrivelanes,consistingofatleast12inchesofquarryspalls,shouldbeconsideredinordertominimizeoffsitesoiltrackingandtoprovideastableaccessentrancesurface.Ceotextilefabricmayalsoberequiredunderlyingthequarryspallsforgreaterstabilityofthetemporaryconstructionentrance,rnErosioncontrolmeasuresshouldconsistofsltfencingplacedarounddowngraoientmarginsofthestteSolstockpilessnoutdbecoveredorotherwiseprotectedtoreducesoileroqionTemporaryapproachesforcontrolingsurfacewaterrunoffshouldbeestahlshedpriortobeqinninoearthworkactivities,Stripping/11Topsoilviesgenerallyencounteredintheupper6to12inchesofexistinggradesatthetestpitlocations.ESNWshouldberetained(observesitestrippingactivitiesatthetimeofconstruction.Over-strippingmayresultinincreasedprojectdevelopmentcostsandshouldbeavoided.Topsoilandorganic-richsoilisneithersuitableforfoundationsupportnorisitsuitabeforuseasstruduratfill.Topsoilandorganic-richsocanbeusedinnon-structuralareasifdesired,tn-situSoilsFromageotechnicalstandpoint,nativesoilsencounteredatthetestptlocationswillgenerallybesuitableforuseasstructuralfillhoweverthenativesoilshavearnoqlwens1ivitythatcanbecharacterizedasmoderatetohigh.Siltysandsoilswithfinescontentsgreaterthan5percenttypicallydegraderapidlywhenexposedtoperiodsofrainfall,Successfuluseofnativesoilsasstructuralfillwilllargelybedictatedbythemoisturecontentatthetimeofplacementandcompaction,Iftheon-sitesoilscannotbesuccessfuflycompacted,Theuseofanimportedsoilmaybenecessary.Inouropinion,ifgradingactivitiestakeplaceduringmonthsofheavyrainfallactivity,acontingencyshouldbeprovidedintheprojectbudgetforexportofsoilthatcannotbesuccessfullycompactedasstructur&fillandimportofgranularstructuralfilLarhtiiorI’W,ItO PoBrothersConstructionES-3622November23,2015Page6RevisedDecember10,2075ImportedSoilsimportedsoilintendedforuseasstructuralflitshouldconsistofawell-gradedgranularsoilwithamoisturecontentthatisatorslightlyabovetheoptimumlevel.Duringwetweatherconditions,importedsoilintendedforuseasstructuralfillshouldconsistofawell-gradedgranularsoilwithafinescontentof5percentorlessdefinedasthepercentpassingtheNumber200sieve,basedontheminusthree-cuarletinchfraction.SubgradePreparationUniformcompactionofthefoundationandslabsubgradeareaswillestablisharelativelyconsistentsubgradeconditionbelowthefoundationandslabelements.ESNWshouldobservethecompactedsubgradepriortoplacingformwcrk,particularlywhereexistingstructureshaveboonremoved.StructuralFillStructuralFillisdefinedascompactedsoilplacedinfoundation,slab-on-grade,androadwayareas.Fillplacedtoconstructpermanentslopesandthroughoutretainingwallandutilitytrenchbackfillaeasisalsoconsideredstructuralfill.Soilsplacedinstructuralareacshouldbeplacedinlooseliftsof12inchesorlessandcompactedtoarelativecompactionof90perceni,basedonthelaboratorymaximumdrydensityasdeterminedbytheModifiedProctorMethod(ASTMD1557).Soilplacedintheupper12inchesofslab-on-grade,utilitytrench,andpavementareasshouldbecompactedtoarelativecompactionofatleast95percen4Additionally,morestringentcornpctionspecificationsmayherequiredforutilitytrenchbackfillzones,dependingontheresponsibleutilitydistrictorjurisdiction.FoundationsInouropinion,theproposedbuildingstructurecanbeconstructedoncompetentnativesoil,recompactednativesoil,ornewstructuralfillIngeneral,competentnativesoilsuitableforsupportoffoundationswilllikelybeencounteredbetweendepthsofapproximatelytwotothreefeetbelowexistinggrades.WherelooseorunsuitablesoilconditionsareexposedatfoundationsubQradeelevations,compactionofthesoilstothespecificationsofstructuralfill.oroverexcavationandreplacementwithasuitablestructuralfillmaterial,willbenecessary.Providedfoundationswillbesupportedasdescribedabove,thefollowingparameterscanbeusedfordesign:Allowablesoilbearingcapacity2,500psfPassiveearthpressure300pcI(equivalentfluid)Coefficientoffriction0.40ia’t’SuiiF’,V.’dC Poo[iothersConstructionES-36%2November23,2015Page7RevisedDecember102015Aone-thirdincreaseintheaTlowblesoilbearingcapacitycanassumedforshort4ermwindandseismiclodingcondiUcns.Theabovepassivepressureandfrictionvaluesincludeafactor-of-safetyofatleast15Withstructuralloadrngasexpectedtotalsettlementintherangeofoneinchanddifferentialsettlementofapproximatelyoneiialfinchisanticipated.Themajorityofthesettlementsshouldoccurduringconstructionasdead[oadsareapplied.SeismicDesignThe2012InternationalBuildingCoderecognizestheAmericanSocietyofClvi]Engineers(ASCE)forseismicsiteclassdefinitions.Basedonthesoilconditionsobservedatthetestpitlocations.inaccordancewithTable%03-1oftheASCEMinimumDesignLoadsforBuildingsandOtherStructuresmanuOl,SiteClassDshouldbeusedfordesign.DuringoursubsurfaceexplorationscompletedonOctober19,2015.groundwaterseepagewasnotencounteredatthetestpitlocations,Inouropinion,sitesusceptibilitytoliquefactioncanbecharacterizedaslow.1hegenerallyconsistentdensitiesotthenativesoilsandtheLackofaconsistentlyestablishedgroundwatertableweretheprimarybasesforthischaracterization.Slab-On-GradeFloorsSlabon-gradefloorsforproposedresidentialbuildingsconstructedonthesubjectsiteshouldbesupportedonafirmandunyieldingsubgrade.Wherefeasible,nativesoilslikelytobeexposedatslab-on-gradesubgradelevelscanbecompactedinsitutothespecificationsofstructuralfillUnstableoryieldingareasofthesubgradeshouldberecompactedoroverexcavatedandreplacedwithsuitablestructuralfillpriortoconstructionoftheslab.Acapillarybreakconsistingofaminimumoffourinchesoffree-drainingcrushedrockorgravelshoulobepacedbelowtheslabThefree-drainingmatenalshouldhaveafinescontentof5percentorless(percentpassingtheNumber200sieve,basedontheminusthree-quarterinchfraction)Inareaswhereslabmoistureisundesirabte,nstal]ationofavaporbarrierbelowtheslabshouldbeconsideredIfavaporbarrieristobeutilized,itshouldbeamaterialspecificallydesignedforuseasavaporbarrier,andshouldbeinstalledinaccordancewiththemanufacturer’sspecifications.RetaininWalIsRetainingwallsshouldbedesignedtoresistearthpressuresandanyapplicablesurchargeloads.Thefollowingvaluesshouldbeusedforconcreteretainingandfoundationwalldesign:ErthSciuionW,O.C PoolBrothersConstructionE8-3622November23,2015Page8RcYisedDecember10,2015•Activeearthpressure(yieldingwalh3pcf(equivalentfluidIgranularfill)•At-restearthpressure(restrainedwall)50pcfTrafficsurchargetpassengervehicles)70pet(rectangulardistribution)Passiveearthpressure300pcf(equivalentfluid)•Allowablesobeatingcapacity2500pf*CoefficientoffrictionGAOLateralseismicsurcharge611(whereHequalswallheightinfeet)Additionalsurchargeloadingfromfoundations,slopedbackfill,orotherloadingshouldbeincludedintheietatningwalldesign,whereapplicableDrainageshouldbeprovidedbehindretainingwallssuchthathydrostaticpressuresdonotdevelop,IfdrainageisnotprovidedhydrostaticpressuresshoulobeincludedinthewaUdesignTheqeotechnicalengineershouldreviewretainingwalldesignstoconfirmthatappropriateearthpressurevalueshavebeenincorporatedintothedesignandtoprovideadditionalrecommendations.ConcreteretainingandfoundationswailsshouldbebackfWedwithfreedrainingmaterialthatextendsalongtheheightofthewall,andadistanceofatleast18inchesbehindthewalLTheupperonefootofthewallbackfillcanconsistofalesspermeable(surfaceseal)soil,ifdesired.Aperforateddrainpipeshouldbeplacedalongthebaseofthewall,andconnectedtoanappropriatedischargelocation.AtypicalretainingdrainagedetailisprovidedasPlate3ofthisstudyDrainagePerchedgroundwatershouldbeanticipatedinsiteexcavationsdependingonthetimeofyeargradingoperationstakeplaceparticularlyinuttlityexcavationsatdepthTemporarymeasurestocontrolsurfacewaterrunoffandgroundwaterduringconstructionwouldlikelyinvolveinterceptortrenchesandsumpsESNWshoulabeconsulteddunrgpreliminarygradingtoidentifyareasofseepageandtoproviderecommendationstorcducethepotentialforinstabilityrelatedtoseepageeffects.Finishgradesmusthedesignedtodirectsurfacedrainwaterawayfromstructuresandslopes.Watermustnotheallowedtopondadjacenttostructuresorslopes.Inouropinion,foundationdrainsshouldbeinstalledalongbuildingperimeterfootings.AtypicalfoundationdraindetailisprovidedonPlete4CrhSlcrMf,LLCI PoolBrothersConstructionP5-3622November23,2015Page9RevisedDecember10.2015ExcavatoandSlopesTheFederalOccupationSafetyandHealthAdministration(OSHA)andtheWashingtonindustrialSafetyandHealthActtVMSHA)providesoilclassificationintermsoftemporaryslopeinclinations.Soilsthatexhibitahighcompressivestrengthareallowedsteepertemporaryslopeinclinationsthanaresoilsthatexhibitalowercompressivestrength.Basedonthesoilconditionsencounteredatthetestpitlocations,looseandmediumdensenativesoils,fillorareaswheregroundwaterseepageisexposedareclassifiedasTypeCbyOSHAandW1SHA,TemporaryslopesoverfourfeetinhehtinTypeCsoi]smustheslopednosteeperthan1,5H:1VfHorizontal:Vertical).Densenativegt2cialtillencounteredwithoutthepresenceofgroundwaterwouldbeclassifiedasTypeAbyOSHAandWISHA.TefnpolaryslopesoverfourfeetinheightinTypeAsoilsmustbeslopednosteeperthan0,75H:1V,TypeAsoilsthataretissured,subjectedtovibrationsfromheavytraffic,orhavebeenotherwisepteviouslydisturbedmustheciassifiedasTypeBbyOSHAandWISHATemporaryslopesoverfourfeetinheightinTypeBsoilsmustbeslopednosteeperthanIH:IV.Thepresenceofperchedgroundwatermaycausecavingofthetemporaryslopesduetoexcessporepressureandseepageforces.ESNWshouldobservesiteexcavationstoconfirmsoiltypesandallo.vableslopeinclinations.[1therecommendedtemporaryslopeinclinationscannotbeachieved,temporaryshoringmaybenecessarytosupportexcavations.Permanentslopesshouldmaintainagradientof2H:IV,orflaher,andshouldbeplantedwithvegetationtoenhancestabilityandtominmizeerosionAnESNWrepresentativeshouldobservetemporaryandpermanentslopestoconfirmtheslopeinclinationsaresuitablefortheexposedsoilconditions,andtoprovideadditionalexcavationandsloperecommendationsasnecessary.PavementSectionsTheperformanceofsitepavementsislargelyrelatedtotheconditionoftheunderlyingsubgrade.Toensureadequatepavementperformance,thesubgradeshouldbeinafirmandunyieldingconditionwhensubjectedtoproofrollingwithaloadeddumptruck,StructuralflitinpavementareasshoutdbecompactedtothespecthcationspreviouslydetailedinthisreportItispossiblethatsoft,wet,orotherwiseunsuitablesubgradeareasmaystillexistafterbasegradingactivities.Areascontainingunsuitableoryeldingsubgradeconditionswillrequiteremedialmeasuressuchasoverexcavationandthickercrushedrockorstructuralfillsectionspriortopavement.Weanticipatenewpavementsectionswillheprimarilysubjectedtopassengervehicletraffic.Forlightlyloadedpavementareassubjectedprimarilytopassengervehicles,thefollowingpreliminarypavementsectionscanheconsidered:Twoinchesofhotmixasphalt(HMA)placedoverfourinchesofcrushedrockbase(CRB),or;•TwoinchesofHMAplacedoverthreeinchesofasphalttreatedbasefATB)LhSjuhrit.’.LLC PoolBrothersCorsfructionES-3622November23.2015pg10RevsedDecember10,2015HevFettrafficareastsuchasaccossdrives)generaHyrequirethickorpavementscctionsdependingonsiteusagepavementhfeexpecaicyandstetrafficForprehmrnarydesnpurposes,thefoowingpavemeniSectionsforheavytrafficareasoanbeconsideredThreeinchesofHMAplacedoversixinchesofCR6,or;:ThreeinchesofHMAplacedoverfourandone-halfinchesofATB.TheHMA,AThandCR8materialsshouldconformtoWSDOtspecificahons,AflsoilbasematendlhouFdbecompactedtoatleast95percentoftnemaximumdrydensityFinalpavementdesinrecommendationscanbeprovidedoncefinaltrafficloadinghasbeendetermined.CityofRentonroadstandardsmaysupersedetherecommendationsprovidedinthisreport.UtilitySupportandTrenchBackfillInouropinion,thenativesoilswilllargelyhesuitableforsupportofutilities.Organic-richsoilisnotconsideredsuitablefordirectsupportofutilitiesandmayrequireremovalatutilitygradesifencountered.,Remedialmeasuresmaybenecessaryinsomeareasinordertoprovidesupportforutibties,suchasoverexcavationandreplacementwithstructuralfill,orplacementofgeotoxtilefabric.Groundwaterseepagemaybeencounteredinutilityexcavations,andcavingoftrenchwailsmayoccurwheregroundwaterisencountered.IngeneraLthenativesoilsshou’dbesuitableforuseasstructuralbackfillintheutilitytrenchexcavationsprovidedthcsoilisatorneartheoptimummoisturecontentatthetimeofplacementandcompactionMoistureconortioningofthesoilsmaybenecessaryatsomelocationspriortouseasstructuralfill,especiallywheregroundwaterseepageisencountered.Eachsect’onofutilityhneEmustbeadequatelysupportedinthebeddingmsteniUtilitytrenehbackfillshouldbeplacedandcompactedtoThespecificationsofstructuralfillaspreviouslydetailedinthisreport,ortotheapplicablespecificationsoftheCityofRentonorotherresponsiblejurisdictionoragencyLiMITATIONSTherecommendationsandconclusionsprovidedinthisgeotechnicalengineeringstudyareprofessionalopinionsconsistentwiththelevetofcareandskillthatistypicalofothermembersintheprofessioncurrentlypracticingundersimilarconditionsinthisarea.Awarrantyisnotexpressedorimplied.Variationsinthesoilandgroundwaterconditionsobsoedatthetestpitlocationsmayexist,andmaynotbecomeevidentuntilconstruction.ESNWshouldreevaluatetheconclusionsinthisgeotechnicaiengineeringstudyifvariationsareencountered.AUditonaIServicesESNWshouldhaveanopportunitytoreviewfinalprojectplanswithrespecttogeotechncairecommendationsprovidedinthisreportESNWshouldalsoheretainedtoprotidetestingandconsultationservicesduringconstruction.Eth5QitnsNW.LLC j7’44.,‘—-NOTETh15p:rny&ccr.ENWcantresponbfcrnvsuhseimrrisLerp-etatno1hecrma’Dresu’tfromttk&wiTEpoJu:73ncts)-‘‘4.7’:!VicinityMapMonterraTownhomesRenton,WashingtonDrn.GLSDatellIO%12015Proj.No,3622CheckedHIW[)aleNo2015Pte6L.A“444:w—.7—NORTHRferertrKingCounty,WashingtonMap62ByTheThomasGuideRandMcNally32ndFdt7on.F.‘$ok*lionsI—41 (i:17F,I/LacJcia‘0L.-0—(NLf)OEcLULCI)U_I<WW1—awCa(I)0(C)CV-oaJ0:—ci_01‘Th9LICD--i’£3E‘3‘-‘E-2-“Ui% 18’MTh.II//PerforatedDrainPipeNOTES:(SurroundInDrainRock)•FieeDriningickitshouldconsistotsoflhavinglessthan5percentfines.Picntpasno#4shoutdbe25to75percent•SheetDrainmaybotoasblcnIcuofrreeDrainingBackfill,perESNWecxnnmendetions.•DiinPipeshou[dconsistofperforated,riiidPVCPipesurroundedwith1”DrainRockLEGEND:rreeDraininaStructuralBackfiflIinchDinRockSCHEMATICONLY-NOTTOSCALENWAON8lRti(TIONDRAWING4r”D.‘==;o0C5OC)‘n—=.,1’‘—e_rCdC)‘UC,6r‘-6-CeaCC-StructuralHilI!$okdlous.4.1RIAININCWALt.RAlNAGEDETAILMonterraTownhamesReman,WashingtonDwn..GLSDate1i?02t20i5Proj.No.3822CheckedHTWDateNnv2015Plato •DoNOTtieroofdownspoutstFoiriDrain•SufaCSealoconsistof12”ofe55permeable,uitab1esoil.Slopeawayfrombuilding.LEGNDSCHEMATICONLY-NOLTOSCALENOTACONSTRUCTIONDRAWING•SrfaceSeal:nativesoilorotherlowpermeabiktymateriaL1DinRock¶a,ii$rJuflni$FCC[iN3DRAINDETAILMonterraTownhomesRnton,WashingtonDrinGLSData1i1Q22D15ProjNo3622CheckedHTWDateNov.2015Plate4(2,-)Slope-c8cMn3NOTES:(Surround AppendixASubsurfaceExporaUonES-3622Thesubsurfaceconditionsatthesuewereexploredbyexcavatingatota’offourtestpitsacrossthedevelopmentenveLopeolTheprop€rtyTheappmximatetestpitlocahonsartliustratedonPlate.2.oFThisreport,ThetestpittogsareprovidedinthisAppendix.ThesubsuthceexplowtionwascompletedinOctober2015usingarubber-tiredbackhoeandoperatorsubcontractedbyLSNW.Thetestpitswereexcavatedtoamaximumdepthofnineandonehalffeetbelowexistinggrades.LogsofthetestpitsexcavatedbyESNWarepresentedinAppendixA.ThefinaLlogstepresenttheinterpretationsofthefieldlogsandtheresultsoflaboratoryanalyses.ThestratificationlinesontheLogsrepresenttheapproximateboundariesbetweensoiltypes.Inactuality,thetransitionsmaybemoregradual.C1hSLticnsNW,LCC EarthSolutionsNWLLCSOILCLASSIFICATION_CRARTMAJoRDIVISIONSSYMBOLSTYPICAL_ __ _ _ _ __ _ __ __ __ __ _GRAPHLEUERDESCRIPTIONSNLLCRAOEDGFAVELS,GL-cF,VtLcAvts.bGWkDXTUPUTflECRNDGRAVLLYF--—IçLIrtURN]C.NF’1--.çpCArt-SAND5TL1E,LTI.ECOARSE-DRAINEDGPAVILSWEHSLrCRAvELSGPA’1iL-AI--O-SOILSFINES%OCTXTUECFCOEFRACID9.):‘‘+RETMNi)ONNO4SIEvE’APPRECI4EsS;’s*JIGCCLAYtYURWELS,ORVtLSANDOFtS)CLAYXTURES-_ _ _ _ __ _-CMELL-JCEO54N05,GVELLYuLEANSANDSLn-rottoflFoAND_ __ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___ _ _ _ ____ _ _ _ ___ _ _ _ _ ___ _ _ _ ___tAtGctThANS.ANDYOCILF)OP’rJDIJSANDS5170tJTflEORNOflNLSPCEiLYNjLfflLEON]fltESSANDSWITH‘EILT’Y5NDSSO•MUFIHANPINESSSTURESOFCDARSEFa4cTloN-PRrCU:j-s(L5’t’?SANDSSANOCLAY01-HNc,)‘‘.tLXTJRESFNZ.SANICSILTSNOyES5MSANDS.ROCKFLOURSLTtORkLCLAYEYH1EAt4D5ORC.AYYS1-JSWIIHSITPIASTOITYSITSSS;S;7%S1tDRSAN:CCLAYDFLt)toc’sLJtDUt’fTCL:—:—iORGANICSNJS%DCROAMS‘—“—t1ccAYsa-WWPIAFUCItYtORThANIctttt5,&1uFuUOROFtATEFALMHCLTG’.!ACEOJSSNE£MDORSLTYOIS_ __ __ _ __ _ _SIZE110010Ut1IT‘jINORGANICCLAYSOE’HIGN0PEATEPINAPtSO-‘ILASTICIflCLAYORCAMCCLAYSUI-ELWJOTi)OHmotiFSTIcrY,oRLTIHIGHLYORG,4NCSOILSPT.SITHDUALSYMOOLSareusedtoind;cateborderhnesoilcsionThediscussionnthetextofthisteportisnecessiyfraproperunderstand,nqofthenatureofthematedIpresentedrithea1tched1o, Frth5jtionkW1fl’1SfthT’iNt201R&kwiw.Whr.jtnnR005ThehQr424494[4FTESTPITNUMBERTP-1PAGE1OI1CuNFPcdE1hrPROJECTNANEMflteIrThwnhmPROJECTHUM3ER3522PROJECTLOCATIONRnIcn,WshintnDATESTARTED1014ii5COMPLE3D10114115GROUNDELEVATiONEXCAVATIONCONTRACTORbMIEvilnGROUNDWATERLEVELS;EXCAVATIONMFTHODATTIMEOFEXCAVATiONLOOGEDBYHThVCHECKEDYflWATENDOFEXCAVATION-NOTESatnbAFTEREXCAVA]IONILGIEITSZEUVSiSMSMSMMC650%MC770%MC110%1210%MC=400%MC12Bi1%flneMAThUIAL.DESCRIPTIONOcowisdlySANDwrthmosei1mpFIIThntSANDwiiNgcavcl,sen.dinipTonortfineSAND,nedur&r,ozm-ckUSDACoIieon.Unnh1yvyfineSANDITnpoorlygraoelineSANDwinsll,cre&urneiselocIens,0m-ycenenteoGrayiIfySAND,dene,mciLmoderotenycernenteliSflAC&5rntvrinrcIjLnyIytorySANDTetiUem’niedat9.5fetI&c.iinqredNo0rouIdoorointcreddlrrin0Et2floOI1Stptot95feettototo IU)LU1I—2cELL4_—wq0000—zEii1—I.-C001‘Iz0HQI—,u9cZ3H3WIN‘U>U,j____________________z-).,0U;’c0ww.iHIdf2h FIts:utjonNW-bP1ceNE,Su’t2UWhrtc8O(%Tphte54491704Fax425-4494711CLIENTPoOothersCcnsrjcrPROJECTNUMBER3622DATESTARTEDlfl.14.1COMW[tIti4l5EXCAVATIONCONTRACTORNWEotEXCAVAflQNMLflIOOLOGGEDBY111WNOTESD&phc-fTuw&Srd12brmbi€CFIECKEDBYHWdTESTPTNUMBERTP-3PAGE1OF1PROJECTNAMEMoLerroToome&PROJECTLGCAflO4Rcrtt,Wazi1j:.GROUNDELEVA11ONTFSTPITGIIOtHUWATERLEVELS:ATTIMEOFEXCAVATiON—AlElDOFEXCAVATIONAFTFRFXCAVATION0XTrh’TESTS0MAIFRIALDESCRIPTION‘;,flTPSLMC=G0%TOPSOIJ.to12ThistySANDthooottmdEmdr1sO,drn-comomedun,-nccTcp1tomnricd.5fottowitirgrodoNo9wurlawotorcun1c-rciurin0,ottpitat5.5tet EarthStnW_ _ __ _ _ __ _ -1%thPceN2(11_ _ __ __ _Bej,WhitjnOtDO5___ _ _ _ ___ _ _ _ _ThIephrn:t2—494/t)4Fat?5444?HCUENTPodSrotrrmtrupqPROJECTNUMBER3DATESTARTED116?15COPL1tOEXCAVA11ONCOMTRACTORNWEinqEXCAVATiONMEThODLOGGEDBY1iTWNOT[DepthctTojso.w0C,.TESTScD1)TESTPiTNUMBERTP-4PAGE1OF1PkUJLCINMLMottettaIownhomePROJECTLQCATIONRnn,WahinglnGROUNDELEVATIONTESIPITSIZEGROUNDWATERLEVELS:ATTIMEOFEXCAVATIONAl’ENUOtLXCAVKnONAFTEREXCAVATIONTOPSOIL1cTrtySANLwittigravet,oetornedwrcwii,rnp-JzSM[LJSDP%Casiotcnton5IrtlhtiyordyLOAM1becoosden!.IdOrtIycemettdTestpdtetmit’atedat1.0feetbowesstrtgretcgrovAerecounteedduriri&]ttom01ItpiSI70soIIT[1C/14F15CHECKLDflHTWzTPSLMAILKIALDFCRIFIION-htsc1i,me AppendixBLaboratoryTestResultsES-36fl#mthSobtmat GRAINSIZEDISTRIBUTION1&J-13thPeN,.5j201c?GLJLN1PIF::-cotr1crPROJECTNAMEM:rcriowrI’.sPROJECT4UMr3rFpROJUttIO(ATIONu5NU.SEtN.]zy;4T1:!ziz-z145.z- -— -- S ——-30—x—,... . ..—20.. --——- - , .—10.-5.0010.ooiooiCfANSIZEINMILLIMTEflSCOBRLFSGRAVELSANDStORCYIr€ccamdmfinc.SpecimenldentrfcationClassificationCcCu5TP-160ft.USDA:TanSlightlyGraueIyFineSand.USCS:SM.TP-19.aft.USDA:craySighLlyGravellyLoamySaniUSGS:SM.TP450ft.USDA:TanSlightlyravellySandyLoani.USGS:SM.FSpecimealdentcnton-0100DGOD30DiDLLFLPt%SiltTP-16.Oft4.750190124--12.79.Oft.9.5J241008926,8ZTP4-5.0ff,190227o,ozz29.5J) 7.0OTHERPERMITSThefollowingpermitsand/orapprovalsarethoughttoberequiredaspartofthisproject:•ConstructionStorrnwaterGeneralPermit(DepartmentofEcology)&I-‘-1_If5tL&•PostmasterApproval>t-c•BuildingPermits•RightofWayPermitP:\14038.0\Reports\Storm\Monterra.TIR.docPageI74 8.0ESCANALYSISANDDESIGNTESCmeasuresareputintoplacetopreventsedimentfromleavingthesite.Thesiteslopesfromeasttowestatanapproximaterateof10%.TheproposedTESCplanwillinclude,butnotbelimitedto,thefollowingguidelinessetintheManualandtheyCityAmendmentstothat4kdocumentinordertocomplywithCoreRequirementNo.5..,1ti1<22o<fClearingLimits—Theclearinglimitsareontheengineeringplansandwillbeflaggedinthefield.CoverMeasures—CovermeasuresarespecifiedontheTESCplansetandwillbeimplementedinthefieldasnecessary.—Off2PerimeterProtection—ThesiltfenceandclearinglimitswillbeshownontheTESCplansandimplementedinthefield.prIjoiIOL-TrafficAreaStabilization—Trafficareastabilizationwillbeaddressedbyastabilizedconstructionentrance.SedimentRetention—Retentionwillbeestablishedbysiltfencesaroundtheperimeterandcatchbasininsertsthatwillcontroloftheon-sitesediment-ladenwater.SurfaceWaterCollection—Runoffwillberoutedtothecollectionditchesandroutedtoasedimenttrapifnecessary.DewateringControl—Anywaterfromdewateringshallbefilteredorcontainedsosedimentcanfilteroutpriortodischargedownstream.DustControl—Dustcontrolbyplinkleringwillbeprovidedasneeded.WetSeasonConstruction:Infrastructurecconstructionwillbeconductedinthesummermonths.AnyconstructionplannedduringthewetseasonwillbeaccordingtoKingCountyandtheCityofRentonstandards.ConstructionWithinSensitiveAreasandBuffers:Therearenoonsitesensitiveareasorbuffers.Maintenance:MaintenancerequirementsaredetailedintheTESCnotesontheengineeringplans.FinalStabilization:Uponcompletionoftheproject,alldisturbedareaswillbestabilizedandBestManagementPracticesremovedifappropriate.t’wP:\l4038.0\Reports\Storm\Monterra.TIR.docPageI75 9.0BONDQUANTITIESTheCityofRentonBondQuantityWorksheetisincludedwithinthissection.P:\J403$.0\Reports\Storm\Monterra.TIR.docPageI76 SiteImprovementBondQuantityWorksheetKingCountyDepartmentofPermitting&EnvironmentalReview35030SEDouglasStreet,Suite210Snoqualmie,Washington98065-9266Foralternateformats,call206-296-6600TTYRelay711ProjectName:MonterraDate:Location:Renton,WAProjectNo.:ActivityNo.:Note:Allpricesincludelabor,equipment,Clearinggreaterthanorequalto5,000boardfeetoftimber?profit.PricesarefromRSMeansdataad]orfromlocalsourcesifnotincludedintheyesXflOIfyes,ForestPracticePermitNumber:__ _ __ _ __ _ _ __ _ __ _ __ _ _ _(RCW76.09)Page1of9Monterra.Bond.xls Site Improvement Bond Quantity Worksheet 515 Web date:02/22/2013 Unit #of Reference #Price Unit Quantity Applications Cost EROSIONISEDIMENT CONTROL Number Backfill &compaction-embankment ESC-1 $5.62 CY 138 1 776 Check dams,4”minus rock ESC-2 SWDM 5.4.6.3 $6751 Each Crushed surfacing 1 1/4”minus ESC-3 WSDOT 9-03.9(3)S 85.45 CY Ditching ESC4 S 8.08 CY Excavation-bulk ESC-5 $1.50 CY 36 1 54 Fence,silt ESC-6 SWDM 5.4.3.1 $1.38 LF 250 1 345 Fence,Temporary (NGPE)ESC-7 $1.38 CF Hydroseeding ESC-8 SWDM 5.4.2.4 $0.59 SY 425 1 251 JuteMesh ESC-9 SWDM5.4.2.2 $1.45 SY Mulch,by hand,straw,3”deep ESC-10 SWDM 5.4.2.1 $2.01 SY Mulch,by machine,straw,2”deep ESC-11 SWDM 5.4.2.1 $0.53 SY 425 1 225 Piping,temporary,CPP,6”ESC-12 $10.70 LF Piping,temporary,CPP,8”ESC-13 S 16.10 CF Piping,temporary,CPP,12”ESC-14 $20.70 CF Plastic covering,6mm thick,sandbagged ESC-15 SWDM 5.4.2.3 $2.30 SY 50 1 115 Rip Rap,machine placed;slopes ESC-16 WSDOT 9-13.1(2)$39.08 CY Rock Construction Entrance,50’x15’xl’ESC-17 SWDM 5.4.4.1 $1,464.34 Each 1 1 1464 Rock Construction Entrance,100’x15’xl’ESC-18 SWDM 5.4.4.1 $2,928.68 Each Sediment pond riser assembly ESC.19 SWDM 5.4.5.2 $1,949.3$Each Sediment trap,5’high berm ESC-20 SWDM5.4.5.1 $17.91 CF Sed.trap,5’high,riprapped spillway berm section ESC-21 SWDM 5.4.5.1 $68.54 CF Seeding,by hand ESC-22 SWDM 5.4.2.4 $0.51 SY Sodding,1”deep,level ground ESC-23 SWDM 5.4.2.5 $6.03 SY Sodding,1”deep,sloped ground ESC-24 SWDM 5.4.2.5 $7.45 SY TESC Supervisor ESC-25 $74.75 HR 16 1 1196 Water truck,dust control ESC-26 SWDM 5.4.7 $97.75 HR 16 1 1564 WRITE-IN-ITEMS ****(see page 9) Each ESC SUBTOTAL:$5,989.90 30%CONTINGENCY &MOBILIZATION:$1,796.97 ESC TOTAL:$7,786.87 COLUMN:A Page2of9 Unit prices updated:02/12/02 Version:11/26/2008 Monterra.Bond.xls Rnrrf flf 9IQ/2fl1R Site Improvement Bond Quantity Worksheet Web date:12/02/2008 Existing Future Public Private Quantity Completed Right-of-Way Right of Way Improvements (Bond Reduction)* &Drainage Facilities Quant.j Unit Price Un Quant.Cost Quant.Cost Quant.I Cost Complete Cost GENERAL ITEMS No. Backfill &Compaction-embankment Gl-1 $5.62 CY Backfill &Compaction-trench Gl-2 $8.53 CY Clear/Remove Brush,by hand GI-3 $0.36 SY Clearing/Grubbing/Tree Removal GI-4 $8,876.16 Acre 0.05 443.81 0.23 2,041.52 Excavation -bulk GI-5 $1.50 CY Excavation -Trench GI-6 $4.06 CY Fencing,cedar,6’high GI-7 $18.55 LF Fencing,chain link,vinyl coated,6’high Gl-8 $13.44 LF Fencing,chain link,gate,vinyl coated,2 GI-9 $1,271.81 Each Fencing,split rail,3’high GI-lO $12.12 LF Fill &compact -common barrow GI-li $22.57 CY Fill &compact -gravel base Gl-12 $25.48 CY Fill &compact -screened topsoil Gl-13 $37.85 CY Gabion,12”deep,stone filled mesh Gl-14 $54.31 SY Gabion,18”deep,stone filled mesh Gl-15 $74.85 SY Gabion,36”deep,stone filled mesh Gl-16 $132.48 SY Grading,fine,by hand Gl-17 $2.02 SY Grading,fine,with grader Gl-18 $0.95 SY Monuments,3’long Gl-19 $135.13 Each Sensitive Areas Sign GI-20 $2.88 Each Sodding,1”deep,sloped ground Gl-21 $7.46 SY Surveying,line &grade Gl-22 $788.26 Day 0.5 394.13 Surveying,lot location/lines Gl-23 $1,556.64 Acre Traffic control crew f 2 flaggers)Gl-24 $85.18 HR 16 1,362.88 Trail,4”chipped wood Gl-25 $7.59 SY Trail,4”crushed cinder Gl-26 $8.33 SY Trail,4”top course Gl-27 $8.19 SY Wall,retaining,concrete Gl-28 $44.16 SF Wall,rookery Gl-29 $9.49 SF Page3of9 SUBTOTAL 2,200.82 2,041.52 Unit prices updated:02/12/02 Version:11/26/08 Rnnrt flata 213/7fl16 KCC 27A authorizes only one bond reduction. Monterra.Bond xis Site Improvement Bond Quantity Worksheet Web date:12/02/2008 Existing Future Public Private Bond Reduction* Right-of-way Right of Way Improvements &Drainage Facilities Quant. Unit Price Unft Quant.Cost Quant.Cost Quant.Cost Complete Cost ROAD tMPROVEMENT No AC Grinding,4’wide machine <1 000sy RI-i $28.00 SY AC Grinding,4’wide machine 1000-2001 Rl-2 S 15.00 SY AC Grinding,4’wide machine >2000sy RI-3 $7.00 SY AC Removal/Disposal/Repair Rl-4 $67.50 SY 13 877.50 Barricade,type I RI-S $30.03 LF Barricade,type Ill f Permanent)RI-6 $45.05 LF Curb &Gutter,rolled RI-7 $17.00 LF Curb &Gutter,vertical RI-8 $12.50 LF 57 712.50 Curb and Gutter,demolition and disposa RI-9 $18.00 LF 57 1,026.00 Curb,extruded asphalt RI-b $5.50 LF Curb,extruded concrete RI-Il $7.00 LF Sawcut,asphalt,3”depth RI-12 $1.85 LF 63 116.55 Sawcut,concrete,per 1”depth RI-13 $1.69 LF Sealant,asphalt RI-14 $1.25 LF 63 78.75 Shoulder,AC,(see AC toad unit price)RI-15 $-SY Shoulder,gravel,4”thick RI-16 $15.00 SY Sidewalk,4”thick Rl-17 $35.00 SY 60 2,100.00 Sidewalk,4”thick,demolition and dispos RI-lB $29.50 SY 39 1,150.50 Sidewalk,5”thick RI-19 $38.50 SY Sidewalk,5”thick,demolition and dispos Rl-20 $37.50 SY Sign,handicap RI-21 $85.28 Each Striping,per stall Rl-22 $5.82 Each Striping,thermoplastic,(for crosswalk)Rl-23 $2.38 SF Striping,4”reflectorized line Rl-24 $0.25 LF Page 4 of9 SUBTOTAL 6,061.80 Unit prices updated:02/12/02 “KCC 27A authorizes only one bond reduction.Version:11/26/08 Monterra.Bond xis ‘)Ii’ñ Site Improvement Bond Quantity Worksheet Web date: Existing Future Public Private Bond Reduction* Right-of-way Right of Way Improvements &Drainage Facilities Quant. Unit Price Unit Quant.I Cost Quant.Cost Quant.Cost Jçmplete Cost ROAD SURFACING (4”Rock =2.5 base &1.5”top course)For ‘93 KCRS (6.5”Rock=5”base &1.5”top course) For KCRS ‘93,(additional 2.5”base)add RS-1 $3.60 SY AC Overlay,1.5”AC RS-2 $11.25 SY AC Overlay,2”AC RS-3 $15.00 SY AC Road,2”,4”rock,First 2500 SY RS-4 $21.00 SY AC Road,2”,4”rock,Qty.over 2500SY RS-5 $19.00 SY AC Road,3”,4”rock,First 2500 SY RS-6 $23.30 SY AC Road,3”,4”rock,Qty.over 2500 SY RS-7 $21.00 SY AC Road,5”,First 2500 SY RS-8 $27.60 SY AC Road,5”,Qty.Over 2500 SY RS-9 $25.00 SY AC Road,6”,First 2500 SY RS-1l $33.10 SY AC Road,6”,Qty.Over 2500 SY RS-1 $30.00 SY Asphalt Treated Base,4”thick S-1 $20.00 SY Gravel Road,4”rock,First 2500 SY RS-t $15.00 SY Gravel Road,4”rock,Qty.over 2500 SY RS-1 $8.50 SY PCC Road,5”,no base,over 2500 SY S-1 $27.00 SY PCC Road,6”,no base,over 2500 SY RS-1I $25.50 SY Thickened Edge S-1 $8.60 LF Pagesof9 SUBTOTAL Unit prices updated:02/12/02 “KCC 27A authorizes only one bond reduction.Version:11/26/08 r—,+,—,.‘DI’I’)n1Monterra.Bondxls Site Improvement Bond Quantity Worksheet Web date:12/02/2008 Existing Future Public Private ‘r Bond Reduction* Right-of-way Right of Way Improvements &Drainage Facilities Quant. Unit Price Unit Quant.Cost Quant.Cost Quant.Cost Complete Cost DRAINAGE (CPP =Corrugated Plastic Pipe Ni 2_or_Equivalent)For Culvert prices,Average of 4’cover was assumed.Assume perforated PVC is same price as solid pipe. Access Road,R/D D-i $21.00 SY Bollards -fixed D-2 $240.74 Each Boltards -removable D-3 $452.34 Each “(CBs include frame and lid) CB Type I D-4 $1257.64 Each CB Type IL 0-5 $1,433.59 Each CB Type II,48”diameter 0-6 $2,033.57 Each for additional depth over 4’D-7 $436.52 FT CB Type II,54”diameter D-8 $2,192.54 Each for additional depth over 4’D-9 $486.53 FT CB Type II,60”diameter D..10 $2,351.52 Each for additional depth over 4’0-11 $536.54 FT CB Type II,72”diameter 0-12 $3,212.64 Each for additional depth over 4’D-13 $692.21 FT Through-curb Inlet Framework (Add)D-14 $366.09 Each Cleanout,PVC,4”D-15 $130.55 Each Cleanout,PVC,6”D-16 $174.90 Each Cleanout,PVC,8”D-17 $224.19 Each Culvert,PVC,4”D-18 $8.64 LF Culvert,PVC,6”D-19 $12.60 LF Culvert,PVC,8”D-20 $13.33 LF Culvert,PVC,12”D-21 $21.77 LF Culvert,CMP,8”D-22 $17.25 LF Culvert,CMP,12”D-23 $26.45 LF Culvert,CMP,15”0-24 $32.73 LF Culvert,CMP,18”D-25 $37.74 LF Culvert,CMP,24”0-26 $53.33 LF Culvert,CMP,30”D-27 $71.45 LF Culvert,CMP,36”D-28 $112.11 LF Culvert,CMP,48”D-29 $140.83 LF Culvert,CMP,60”D-30 $235.45 LF Culvert,CMP,72”0-31 $302.58 LF Page 6 of 9 SUBTOTAL Unit prices updated:02/12/02 “KCC 27A authorizes only one bond reduction.Version:11/26/08 Site Improvement Bond Quantity Worksheet Web date:12/02/2008 Existing Future Public Private Bond Reduction’ Right-of-way Right of Way ImprovementsDRAINAGECONTINUED—&Drainage Facilities Quant. No.Unit Price Unit Quant.Cost Quant.J Cost Quant.Cost Complete Cost Culvert,Concrete,8”D-32 $21.02 LF Culvert,Concrete,12”D-33 $30.05 LF Culvert,Concrete,15”D-34 $37.34 LF Culvert,Concrete,18”D-35 $44.51 LF Culvert,Concrete,24”0-36 $61.07 LF Culvert,Concrete,30”0-37 $104.18 LF Culvert,Concrete,36”D-38 $137.63 LF Culvert,Concrete,42”D-39 $158.42 LF Culvert,Concrete,48”D-40 $175.94 LF Culvert,CPP,6”D-41 $10.70 LF Culvert,CPP,8”0-42 $16.10 LF Culvert,CPP,12”D-43 $20.70 LF Culvert,CPP,15”D-44 $23.00 LF Culvert,CPP,18”D-45 $27.60 LF Culvert,CPP,24”D-46 $36.80 LF Culvert,CPP,30”0-47 $48.30 LF Culvert,CPP,36”0-48 $55.20 LF Ditching 0-49 $8.08 CY Flow Dispersal Trench (1,436 base+)D-50 $25.99 LF French Drain (3’depth)D-51 S 22.60 LF Geotextile,laid in trench,polypropylene D-52 $2.40 SY Infiltration pond testing 0-53 $74.75 HR Mid-tank Access Riser,48”dia,6’deep 0-54 $1,605.40 Each Pond Overflow Spillway 0-55 $14.01 SY Restrictor/Dil Separator,12”0-56 $1,045.19 Each Restrictor/OiI Separator,1 5”0-57 $1,095.56 Each Restrictor/OiI Separator,18”0-58 $1,146.16 Each Riprap,placed D-59 $39.08 CY Tank End Reducer (36”diameter)0-60 $1,000.50 Each Trash Rack,12”D-61 $211.97 Each Trash Rack,15”0-62 $237.27 Each Trash Rack,18”0-63 $268.89 Each Trash Rack,21”D-64 $306.84 Each Page 7 of 9 SUBTOTAL *KCC 27A authorizes only one bond reduction. Unit prices updated:02/12/02 Version:11/26/08 Web date:12/02/2008 $ Site Improvement Bond Quantity Worksheet 21.00 $28.00 $4.55 $11.41 SUBTOTAL Page 8 of 9 SUBTOTAL (SUM ALL PAGES): 30%CONTINGENCY &MOBILIZATION: GRAN DTOTAL: COLUMN: 8,262.62 2,478.79 10,741.40 B C 2,041.52 612.46 2,653.97 D E Unit prices updated:02/12/02 Version:11/26/08 fl_.___L fl_S...fl In Iflfl,1 fl 2”AC,2”top course cock &4”borrow I PL -1 Existing Future Public Private Bond Reduction5 Right-of-way Right of Way Improvements &Drainage Facilities Quant. Unit Price Unit Quant.Price Quant.I Cost Quant.I Cost Complete Cost 4”select borrow 2”AC,1.5”top course &2.5”base courl PL -2 1.5”top course rock &2.5”base course I PL -4 SY PARKING LOT SURFACING I PL -3 SsT, SY sy UTILITY POLES &STREET LIGHTING Utility pole relocation costs must be accompanied by Franchise Utility’s Cost Statement Utility Pole(s)Relocation UP-i Lump Sum Street Light Poles w/Luminaires UP-2 $7,500.00 I Each WRITE-I N-ITEMS (Such as detention/water quality vaults.)Ni WI-i Each Wl-2 Each WI-3 CY Wl-4 LF WI-S FT WI -6 WI -7 WI -8 WI -9 WI -10 “KCC 27A authorizes only one bond reduction. r,,,-..,i-,.-..-,D....-,..l Web date:12/02/2008 Original bond computations prepared by: Site Improvement Bond Quantity Worksheet Name: PE Registration Number: Firm Name: Address: Daniel Smith,PE CES NW 47023 310 29th ST NE,Puyallup,WA 98372 Date: Tel.#: Project No: 2/3/2016 253-848-4282 NA ROAD IMPROVEMENTS &DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS PERFORMANCE BOND* AMOUNT $7,786.9 $10,741.4 $ $2,654.0 $18,528.3 $21,182.2 Minimum bond*amount is $2000. BOND*AMOUNT REQUIRED AT RECORDING OR TEMPORARY OCCUPANCY PUBLIC ROAD &DRAINAGE MAINTENANCE/DEFECT BOND” *NOTE:The word “bond”as used in this document means a financial guarantee acceptable to King County. ““NOTE:KCC 27A authorizes right of way and site restoration bonds to be combined when both are required. The restoration requirement shall include the total cost for all TESC as a minimum,not a maximum.In addition,corrective work,both on-and off-site needs to be included.Quantities shall reflect worse case scenarios not just minimum requirements.For example,if a salmonid stream may be damaged,some estimated costs for restoration needs to be reflected in this amount.The 30%contingency and mobilization costs are computed in this quantity.a NOTE:Per KCC 27A,total bond amounts remaining after reduction shall not be less than 30%of the original amount (T)or as revised by major design changes. REQUIRED BOND*AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DDES Unit prices updated:02/12/02 Version:11/26/08 0..4.fl._I..-..fl In P1fl A C’ Stabilization/Erosion Sediment Control (ESC)(A) Existing Right-of-Way Improvements (B) Future Public Right of Way &Drainage Facilities (C) Private Improvements (D) Calculated Quantity Completed Total Right-of Way and/or Site Restoration Bond*/**(A+B) (First $7,500 of bond”shall be cash.) Performance Bond”Amount (A+B+C+D)=TOTAL (T) L c ‘&VTh’J Reduced Performance Bond”Total *** Maintenance/Defect Bond”Total c7 + NAME OF PERSON PREPARING BOND”REDUCTION fE)$ T x 0.30 $6,354.7 OR (T-E)$21,182.2 Use larger of 1x30%or (T-E)(B÷C)x 0.25 =$2,685.4 Date: Page 9 of 9 Check out the DDES Web site at www.kingcounty.qov/permits Monterra.Bond.xls 10.0OPERATIONSANDMAINTENANCEMANUALThedrainagefacilitiesonthisprojectwillbemaintainedbythehomeowners.Maintenanceinstructionsareincludedwithinthissection.P:\1403$.0\Reports\Storm\Monterra.TIR.docPage$6 srci1\fHVCiRCL3(j)(2.3.5MAIN1Tr’ANcEISTRLlCTJf)S1t)RJJMtTFI)1N1iL[RA[IONlithenitdifllla1iunflovcutrolBMkisorosedfcaprojtcLthe1013OWflLIaintenanccrndorrnioninslitonsniuSt[rciniedasanattachmenttothereuheddeclaentiortofctonIndgtInIofsementciRcuitement3niSecticuc:i3,c’—is,.‘p1wintent‘fiheeinstructicmsktuvpliintofuturepropenvowners,thepurposeutthoBMPandhowitmusthnnmtaincdunduperated.ThcsiinctriCtntisnieintendedtohenminimum;flDFSmotequireadditinnolim;lmclionshadnflsesctliccciitkwis,Also.asthetocintgtnsniorccpiertcewiththcniiiitteiirieimdnpcrattonofLIILLR\IPI‘itureupdte,titneintentt1mIIhepoIdniin.Ctuuits11cfuI)t.,7?Manu1wobsiw.TEXTOFINSTRUCTtONSYourpropertycontainsastormwatermanagementflowcontrolOMP(bestmanagementpractice)cafled“limitedinfiltration,”whichwinstalledmitiqatethestormwaterquantityandqualityimpuotsofsomeraHoftheimpervioussurfacesonyourpropertylimitedinfiltrationisamthodofsoakingrunofffromimpeiviousareaIsuchaspavedareasandroofsintotheground.Infiltrationdevices.suchasgravelfilledtrenchesdryw&Is,andgroundsurfacedepressions.facJitatethisprocessbyputtinerunoffindirectcontactwiththesoilandhoidthotherunofflongenoughtosoakmostofitintothegroundTobesuccessful.thesoilconditionaroundtheinfiltrationnevicemustbeableLasoakwaterintothearoundforareasonablenumberofyears.TheinfiltrationdevicesusedonyourpropertyincludethelollownqasindicatedontheflowcontroltPstepan;JgraveLfilledtrenches.Jdr’wells.Thesize.placement.andcompositionofthesedevicesasdepitledbytheflowcontrolLMFsteplananddesirtnCcti1smusthemaintainedandmaynothechangedwithoutwuttonapprovaleitherfromtheKingCountyVaierandLandResourcesDivisionorthroughafuturedevulopmentpermitmomKingCountyInfihiratiendevicesmustheinspectedannuallyandaftermajorstormeventstodenti1’andrepairanyphysicaldefectsMaintenanceandoperationofthesystemshouldfacusonensuringthesystem’sviabilitybypreventingsedimentladenflowsfromenteringthedeviceFxcesmiened:mentohoowillresultinapluggedornon4un.etionirtgfacility.Iftheinfiltrationdevicehasacatchbasin,sedimentaccumulationmustberemovedonayearlybasisormorefrequentlyifnecessaryPiolongedpondingaroundoratopadevicemayindicateapluggedfacflityIfthedevicebecomespuggeditmustberectacedKeepingtheareasthatdraintoinfiltrationdeviceswellsweptandcleanwillenhancethelonevityofthesedevices.Forroofs,frequentcieaningofgutterswillreducesedtmentloadstothesedevicesIOiiij2OtY)Srfu,\tnwrDign1n,u1—.ppr:hC 1L.t.\.CLRLQLiu•trrsintrtCvIftuL\Vc\CL.‘t)VQr.uijitiFNO.2—INFILTRATIONFACILITIESnrtionPond,ToporSideSicpoofDam,6ernor[.rnbnkrnen1iiititTtrOrJr?or;d.Tank,Vault,Ir€nchortrniUn5torteFrehfiitrtionTankStrtrcturehfiirationVatilSrructJiGapstifvierseconsdamjdfrOt5orcrac;sCIIfoarinw&lOOhLi0flWhentarntnarioesNeededAnvcashandooL’uswfirrrjIctib1ojiI000sqr.iarefeetsabii1ouaitoItewri-ujntoftiasritwoulaketffpr,tandardorofb.lrrhqrcnhgener&1hee5ncnJbenorsuOlirrrrnfdurripinqAnynrooiornuoancceetalionwbchmayha;dtncrnl’lorfhpbtc4AniclenceofcrrantrpoUuionuciasotgasohnc,concreleslurriesorparnt.Grosorgrdnjixcd:ifnnhesinIArir’idricaifrnrfntholosi’falhtyadarnorboimurnywd€rintfwfnr-pipingthtOuhdarnorberniloriOntholos.reerOwththreatensintegrrtci[drni.b.nrrorslopesdoestotatcwanfnanoeaccess.orintifccwithn,antenanceOctrvrtyIflrearfhrrttodon,borni.orankmentnilrttorrioit.ifenriwithaccoasormeintenancetheydonotridinIrrrnridErciearnaocr2rtuficdir:pvhrrErnseofmaarstiIprecentorwheretooteintroteniwiforconhinuoerosionAnyerosonobrcdonacompactanslope.Airypcrlofdarn,bermorernbankjnenlthathassettd4qci’elowecthanthedosnalovahncItinchesormoresedimentspresentorannrentstnntestmircetesfacilityiworkingatorIthorr90%ofAiryckioothovent.Anypartnrankipipe5bentutofshapeniorethan10%ofikdoiiqnshapeAapwiCerthanl’-nchattheaotofanylankrn1nnnoranycvidcnccofsopanc:e5entennthrtanktajuintorIhrnrrrrhr,wallCrackswiderthan4inchanyrzvrdirnrotsoilemenlOteestructurethroughcracAsorqLaLticdn5pec1crpersonneldetormrnsthatthe‘iItnotruntotallyocuridResultsE.poct.udWhriMaintenanceIsPerformedTrasharcd&briclearedfrnrvsireNxrau&antInuisanceveoOtatronronrovotIa000ldinitoapicablerquintinnsNodangerotnorrousttrrrwhirriiCiinlynersornolorthepbtrcmightnorniatybMatenaisrernoodndiipcrronfofaccordiriçtoapplicableregutationoOnurceoontol0MPmemeriedifappropriate.Noconiarmnantsi’rennotherthanaijrfcoOilUrnGas.sorroundcc’orflowedtOahurlrliioqrnrthanfiniliesROdEntSremovedordesroyedanddamorbermropafredTrsdjnot5ricerfacOypeifoiniaiLUiJrnairrtnrianneaCtLlliC5tcpesstat)Aodu5inaopopriateIrrOSiOncontrolmeasuresIferosion5000bliIngOilcor:iprucdrdslopeiaensedc:wIergrneersioiidbeconsultedtoresolvesouicoferosion.TporstIesloperestoredtodOSioridimensionsIfsett[ernentissiqrnficrrratrenseccivilenrineershouldbeconsultedtodeterminethecanseoftIresattlarnifFiuitrtviii!rtlratasas:Tankorvaultfreeyvenis.TankrepairedorreplacedtodasrrjriNowateroreo.Ionterrrrgtankthrouphjointsorwails.ttatntraricaComponentSiteDefcotorProblemTrashanddebrisNo:rcusveaJsConn’inontsandpulluhorrGrass.oroundocvcrROdenticesItQurcvdhSodmontar.icumuilalonPIugedirventTankbentoutcishapearnagetowall.frarna,bottom.and/orlcrpsiahVaultissealedandstrudur&Iy%flhiOSrtElacVkitci[I.cjri\Iiniiai—\‘1%2rJ1t PP\1)r\\MNIIcS.XtTRr,flI1EFT’FtOV(ONV)\(‘JF.I11XNO.2—INHLTRATIONFACILiTIESSemen1ishnddebnsLoorqmecharimnQwokngConditoriWhenMünt.toncetNeededSedimeotfithrq2CtorniorcithepipeTrashanddebriseccumya1ednpeeidudesfoatabesanir’i4Loalobtes).Crockswiderthan4nhattheontofthetioutttpipesoranyevdence01soenterhqeithent$ofheiutpipes.CoverhdIsmissingorodyparialtyfripceAnyopenmflhOerequiresimmediatemaLntenancehtehirna-noonnctbocponeiivnrrmantenanceperscivthpoperlootsBoltscannotbetes.Sfbckncteo’eUhddecsnotResultsExpectedWhenMaintenanceIsPerformedlnoubeppescearofaedinentNotrashordebrisLiipipesNocracksmorethan-InchthejonlofIheinteLoutLetp1peMarthoteaeoeeSeoered.LcddormoeodsrnstandamcMOwsrthtenafleepersonsieA.4I2fhJSriciir1)sirmirin:iril—ppriuhtMaintenanceCGmponentDetectorPrObtOmtnebOulletPipesAccessMnhcleCvertidnotrnpaceMeohanmopenswithproperlodeLaddortwigsunsafoCcwerltrridhfrnrAltoOnemaintenarriopersoncannotremoverCoverilidcanhermaverrtendrcrLrC.ovrrr,iidifirriplyhrOlbsciIthrcrnstalkiibyoncnriteiancrperrsonMscThgtwigsmoolignnrent,rust,orcracksLameaccessDmageo1orditPciutLarooaresedeoreorp[aiesanrotbeReplaceorrepairaccessdoorsodtsptatstoopenOpened?rernovedosmgnomiaerquiprrrerritcancnoriettassrnedC5apsdOesn’toverLargeaccessdoorsnotttatondoraccessDoersclosefiat.aridcoversaccesscompIetelopinenotccnipltiycovered.openingcomptelt.LihiriRiru.srrgLflrriringsriotrsiaclctoicwreqtrlutdrorLiftingnnguthcaiittoliiiOrnrLedorpiatetemcedOOL0inffltrabonPond.PtugedFItorbagliroftithaii[ottReplacelifterbagorredesignTank.Vutt,1rench.system.rmatlBasinFiftersagstitf&a5cnPond.Sothrentormore1sedimenthasecnlatedPre-stthriqoccursasqr1dTankVault,TrnnharririmlaftinorSmnaIIB,usr’iProWsettkngPondsandVaultsttfn1lratrnPond,PtugudMliwtilevelonupstreamsdCutbIterRockfitterreplacedealua1eneonRockFitterremainsforextendedperiodotimeorlittleornoforfiberandremovednotwaterflowsthroughfitterdurnheavyrainnecessary.stormsInfiltrationPondodcmrasngOnlyonelayerofrockexistsabovenativesitnnSpmttwayrestoredtodesignEmorgencyOvarfiowascafivesvarefeeto’oreer.oranyeposurcofSprllwaynnlrv.esortatthetopofm211mwpathnsprh.ayRrp-aponinsrilsIoperteintriotberedaraniTiucff0WtlrTrou‘grnrvAhmurudosfkwccthrimtc:nssiabilityvtTrrstriiuvcdscri’ay APPENDIXAMAINTENANCEREQUIREMENTSFORFLOWCONTROL,CONVEYANCE,ANDWQFACILITIESNO.5—CATCHBASINSANDMANHOLESMaintenanceDefectorProblemConditionWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedStructureSedimentSedimentexceeds60%ofthedepthfromtheSumpofcatchbasincontainsnobottomofthecatchbasintotheinvertofthesediment.lowestpipeintooroutofthecatchbasinoriswithin6inchesoftheinvertofthelowestpipeintooroutofthecatchbasin.TrashanddebrisTrashordebrisofmorethan%cubicfootwhichNoTrashordebrisblockingorislocatedimmediatelyinfrontofthecatchbasinpotentiallyblockingentrancetoopeningorisblockingcapacityofthecatchbasincatchbasin.bymorethan10%.TrashordebrisinthecatchbasinthatexceedsNotrashordebrisinthecatchbasin.1/3thedepthfromthebottomofbasintoinvertthelowestpipeintooroutofthebasin.DeadanimalsorvegetationthatcouldgenerateNodeadanimalsorvegetationodorsthatcouldcausecomplaintsordangerouspresentwithincatchbasin.gases(e.g.,methane).Depositsofgarbageexceeding1cubicfootinNoconditionpresentwhichwouldvolume,attractorsupportthebreedingofinsectsorrodents.DamagetoframeCornerofframeextendsmorethan%inchpastFrameisevenwithcurb.and/ortopslabcurbfaceintothestreet(Ifapplicable).Topslabhasholeslargerthan2squareinchesorTopslabisfreeofholesandcracks.crackswiderthan%inch.Framenotsittingflushontopslab,i.e.,Frameissittingflushontopslab.separationofmorethan%inchoftheframefromthetopslab.CracksinwallsorCrackswiderthan%inchandlongerthan3feet,Catchbasinissealedandbottomanyevidenceofsoilparticlesenteringcatchstructurallysound.basinthroughcracks,ormaintenancepersonjudgesthatcatchbasinisunsound.Crackswiderthan%inchandlongerthan1footNocracksmorethan1/4inchwideatatthejointofanyinlet/outletpipeoranyevidencethejointofinlet/outletpipe.ofsoilparticlesenteringcatchbasinthroughcracks.Settlement!Catchbasinhassettledmorethan1inchorhasBasinreplacedorrepairedtodesignmisalignmentrotatedmorethan2inchesoutofalignment,standards.DamagedpipejointsCrackswiderthanY2-inchatthejointoftheNocracksmorethan%-inchwideatinlet/outletpipesoranyevidenceofsoilenteringthejointofinlet/outletpipes.thecatchbasinatthejointoftheinlet/outletpipes.ContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulations.SourcecontrolBMP5implementedifappropriate.Nocontaminantspresentotherthanasurfaceoilfilm.Inlet/OutletPipeSedimentSedimentfilling20%ormoreofthepipe.Inlet/outletpipesclearofsediment.accumulationTrashanddebrisTrashanddebrisaccumulatedininlet/outletNotrashordebrisinpipes.pipes(includesfloatablesandnon-floatables).DamagedCrackswiderthan%-inchatthejointoftheNocracksmorethan%-inchwideatinlet/outletpipesoranyevidenceofsoilenteringthejointoftheinlet/outletpipe.atthejointsoftheinlet/outletpipes.2009SurfaceWaterDesignManual—AppendixA1/9/2009 APPENDIXAMAINTENANCEREQUIREMENTSFLOWCONTROL,CONVEYANCE,ANDWQFACILITiESNO.5—CATCHBASINSANDMANHOLESMaintenanceDefectorProblemConditionWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedMetalGratesUnsafegrateopeningGratewithopeningwiderthan/8inch.Grateopeningmeetsdesign(CatchBasins)standards.TrashanddebrisTrashanddebristhatisblockingmotethan20%Gratefreeoftrashanddebris.ofgratesurface.footnotetoguidelinesfordisposalDamagedormissingGratemissingorbrokenmember(s)ofthegrate.GrateisinplaceandmeetsdesignAnyopenstructurerequiresurgentstandards.maintenance.ManholeCover/LidCover/lidnotinplaceCover/lidismissingoronlypartiallyinplace.Cover/lidprotectsopeningtoAnyopenstructurerequiresurgentstructure.maintenance.LockingmechanismMechanismcannotbeopenedbyoneMechanismopenswithpropertools.NotWorkingmaintenancepersonwithpropertools.Boltscannotbeseated.Self-lockingcover/liddoesnotwork.Cover/liddifficulttoOnemaintenancepersoncannotremoveCover/lidcanberemovedandRemovecover/lidafterapplying80lbs.oflift,reinstalledbyonemaintenanceperson.1/9/20092009SurfaceWaterDesignManual—AppendixAA-10 APPENDIXAMAINTENANCEREQUIREMENTSFORFLOWCONTROL,CONVEYANCE,ANDWQFACILITIESNO.6—CONVEYANCEPIPESANDDITCHESMaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedPipesSediment&debrisAccumulatedsedimentordebristhatexceedsWaterflowsfreelythroughpipes.accumulation20%ofthediameterofthepipe.Vegetation/rootsVegetation/rootsthatreducefreemovementofWaterflowsfreelythroughpipes.waterthroughpipes.ContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulations.SourcecontrolGMPsimplementedifappropriate.Nocontaminantspresentotherthanasurfaceoilfilm.DamagetoprotectiveProtectivecoatingisdamaged;rustorcorrosionPiperepairedorreplaced.1coatingorcorrosionisweakeningthestructuralintegrityofanypartofpipe.DamagedAnydentthatdecreasesthecrosssectionareaofPiperepairedorreplaced.pipebymorethan20%orisdeterminedtohaveweakenedstructuralintegrityofthepipe.DitchesTrashanddebrisTrashanddebrisexceedsIcubicfootper1,000Trashanddebrisclearedfromsquarefeetofditchandslopes,ditches.SedimentAccumulatedsedimentthatexceeds20%oftheDitchcleaned/flushedofallsedimentaccumulationdesigndepth.anddebrissothatitmatchesdesign.NoxiousweedsAnynoxiousornuisancevegetationwhichmayNoxiousandnuisancevegetationconstituteahazardtoCountypersonnelortheremovedaccordingtoapplicablepublic,regulations.NodangerofnoxiousvegetationwhereCountypersonnelorthepublicmightnormallybe.ContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulations.SourcecontrolBMPsimplementedifappropriate.Nocontaminantspresentotherthanasurfaceoilfilm.VegetationVegetationthatreducesfreemovementofwaterWaterflowsfreelythroughditches.throughditches.ErosiondamagetoAnyerosionobservedonaditchslope.Slopesarenoteroding.slopesRockliningoutofOnelayerorlessofrockexistsabovenativesoilReplacerockstodesignstandards.placeormissing(Ifarea5squarefeetormore,anyexposednativeApplicable)soil.2009SurfaceWaterDesignManual—AppendixA1/9/2009A-Il APPENDIXAMAINTENANCEREQUIREMENTSFLOWCONTROL,CONVEYANCE,ANDWQFACILITIESNO.if-GROUNDS(LANDSCAPING)MaintenanceDefectorProblemConditionsWhenMaintenanceisNeededResultsExpectedWhenComponentMaintenanceisPerformedSiteTrashorlitterAnytrashanddebriswhichexceed1cubicfootTrashanddebrisclearedfromsite.per1.000squarefeet(thisisaboutequaltotheamountoftrashitwouldtaketofilluponestandardsizeofficegarbagecan).Ingeneral,thereshouldbenovisualevidenceofdumping.NoxiousweedsAnynoxiousornuisancevegetationwhichmayNoxiousandnuisancevegetationconstituteahazardtoCountypersonnelortheremovedaccordingtoapplicablepublic,regulations.NodangerofnoxiousvegetationwhereCountypersonnelorthepublicmightnormallybe.ContaminantsandAnyevidenceofcontaminantsorpollutionsuchMaterialsremovedanddisposedofpollutionasoil,gasoline,concreteslurriesorpaint,accordingtoapplicableregulations:SourcecontrolBMP5implementedifappropriate.Nocontaminantspresentotherthanasurfaceoilfilm.Grass/groundcoverGrassorgroundcoverexceeds18inchesinGrassorgroundcovermowedtoaheight.heightnogreaterthan6inches.TreesandShrubsHazardAnytreeorlimbofatreeidentifiedashavingaNohazardtreesinfacility.potentialtofallandcausepropertydamageorthreatenhumanlife.Ahazardtreeidentifiedbyaqualifiedarboristmustberemovedassoonaspossible.DamagedLimbsorpartsoftreesorshrubsthataresplitorTreesandshrubswithlessthan5%brokenwhichaffectmorethan25%ofthetotaloftotalfoliagewithsplitorbrokenfoliageofthetreeorshrub,limbs.TreesorshrubsthathavebeenblowndownorNoblowndownvegetationorknockedover,knockedovervegetation.Treesorshrubsfreeofinjury.TreesorshrubswhicharenotadequatelyTreeorshrubinplaceandsupportedorareleaningover,causingexposureadequatelysupported;deadoroftheroots,diseasedtreesremoved.1/9/20092009SurfaceWaterDesignManual—AppendixAA-16