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PanGE®INCORPORATIDGeotechnca!&EarthquakeEngineenngConsultantsOctober30.2013FfleNo.13-200Mr.RaymondNgP.O.Box4084Renton,WA98057Subject:CeotechnicalEngineeringReportProposedRetailDevelopment60SWSunsetBoulevard,Renton.WashingtonDearMr.Ng.Asrequested,PanGEO.Inc.hascompletedageotechnicalengineeringstudytoassistyouandtheprojectteamtiththedesignandconstructionof’theproposedretaildevelopmentattheabove-referencedsite.ThisstudywasperlormedingeneralaccordancewithourmutuallyagreedscopeolworkoutlinedinourproposaldatedAugust29,2t)13.whichwassubsequentlyapprovedbyyouonAugust30,2013.Ourservicescopeincludedreviewingreadilyavailablegeologicdata.drillingtwotestborings.conductingasitereconnaissance.anddevelopingtheconclusionsandrecommendationspresentedinthisreport.SITEANDPROJECTI)ESCRLPTION1hesubjectpropertyislocatedat6()SWSunsetBoulevardinRenton.Washington(seeVicinityMap.FigureI).[hesiteisroughlytrapeioidalinshape.andisborderedhSWSunsetBoulevardapproximateltothesouth.b[lardieAvenueSWapproximatelytotheest.bySWlarrisPlacetothenorth,andb’acommercialproperttotheeast(seeFigure2).[hesubjectsiteiscurrentlanasphaltparkinglot‘.ithanarrowone—storybuildinglocatedalongthecastpropertline.Basedonareviewofthetopographicsurveymap.thesitegradegenerall\slpesdownfromthenorthwestcornertothesoutheastcorncr‘‘ithanaeragegradientotapproximateIt)toI5percent.C\1 GeotechnicalEngineeringReportProposedRetailDevelopment—60SWSunsetBoulevard.Renton.WAOctober30.2013SITECEOLOCYANDSUBSURFACECONDITIONSAccordingtotheGeologicMapofKingCounty(Booth.et.al.2007).theprojectsiteisLinderlainbyTukwilaFormation(Tpt),whichisdescribedasconsistingmainlyofandesiticsandstone,tutEandminorlavaflowsorsills.Thesoilsobservedintheboringsconsistedoffilloverloosetoverydensesiltysand(completelytohighlytoteathcredsandstonej,theresultsfromoursubsurfaceexplorationaregenerallyconsistentwiththemappedgeologyatthesite.Theftllowingisadescriptionofthesubsurfaceconditionsencounteredintheboringsadvancedatthesite.Pleaserefertothesummaryboringlogs(Figures4and5)bradditionaldetails.Unit1:Fill—Ourboringsencounteredapproximately3to3’/2tbetofbrowntodarkbrown,moist,loosetomediumdense,siltysandtosandysiltwithtracetosomegravel.Weinterpretthisunitastill.(‘nit2:Th,’lth’tocompletelyWeuthc’redSdtsione7Saiidstone—Belowthefill,ourboringsencounteredlightbrowntoyellowishbrown,siltysandthatextendedtoatleasttheterminationdepthsof11V2andIIfeetinBH—IandBH—2.respectively.Thisunitisloosetomediumdenseindensityfromapproximatel\3iëettoabout3andI0feet.andthenbecomesverydense.Basedonthetextureobservedonthesoilsamples.‘.einterpretthisunitashighlytocompletelyweatheredsandstone.ThisunitappearsconsistentwiththemappedTuk\tilaFormation.Groundaterwasnotencounteredintheboringsduringdrilling.Iloever.verymoistsoilwasobservedbetween2to5ICetintheboringsduringdrilling.Localizedwaterhearingfracturesmay’hepresentithinthe‘1’ukilaFormationand/orperchedwatermahepresentontopoftheIuktilaFormation.Itshouldhenotedalsothatgroundaterelevationsandseepageratesarelikelytovarydependingontheseason.localsubsurfaceconditions,andotherfactors.Groundaterlevelsandseepaueratesarenormallyhighestduringthewinterandearlyspring.SITESTABILITYBasedonourfieldobservationsohexistingsitefeatures.thegeneraltopograph’atthesiteand\ieinitv.andtheresultsob’oursuhsurliceexplorations,itisouropinionthatthesubjectsiteiselohall’stableinitscurrentconfiguration.Furthermore.itisalsoouropinionthattheproposedretaildcclopmentasplanned‘illnotdecreasethesitestahlIitorad\erselimpactthe%ubjcctI2s\\surtIn\d—kilRptPiie3Pdn(1.0.nc, GeotechnicalEngineeringReportProposedRetailDevelopment—60SWSunsetBoulevard.Renton.WAOctober30,2013bearingpressureisfordeadplusliveloads,Forallowablestressdesign,therecommendedbearingpressuremaybeincreasedbyone-thirdfortransientloading.suchaswindorseismicf’orces.Continuousandindividualspreadfootingsshouldhaveminimumwidthsof’I$and24inches,respectively.Footingsdesignedandconstructedinaccordancewiththeaboverecommendationsshouldexperiencetotalsettlementof’lessthanoneinchandditierentialsettlementoflessthan‘/2inch.Mostoftheanticipatedsettlementshouldoccurduringconstructionasdeadloadsareapplied.LateralResistance—Lateralloadsonthestructuremayberesistedbypassiveearthpresstiredevelopedagainsttheembeddedportionofthefoundationsystemandbyfrictionalresistancebetweenthebottomofthefoundationandthesupportingstihgradesoils.Forfootingsbearingonthedensenativeweatheredrockorcompactedsand/strticttiralfill,africtionalcoefficientof0.3maybeusedtoevaluateslidingresistancedevelopedbetweentheconcreteandthecompactedsuhgradematerial.Passivesoilresistancemaybecalculatedusinganequivalentfluidtveightof’300pcf.assumingproperlycompactedstructural1111willbeplacedagainstthefootings.Theabovevaluesincludeahctorofsafetyof1.5.Unlesscoveredbypavementsorslabs.thepassiveresistanceintheupper12inchesofsoilshouldheneglected.PerimeterFootingDrainfootingdrainsshouldbeinstalledaroundtheperimeterof’thebuildings.atorjustbelowtheinvertoftheFootings.Undernocircumstancesshouldroof’downspoutdrainlinesbeconnectedtothefootingdrain5)stems.Roofdonspoutsmustheseparatelytightlinedtoappropriatedischargelocations.Cleanoutsshouldheinstalledatstrategiclocationstoallo\\forperiodicmaintenanceofthefootingdrainanddownspotittightlinesystems.FootingSubgradePreparation—AllfootingexcavationsshouldbetrimmedneatandFootingstihgradesshouldhecarefullyprepared.TheadequacyoffootingsubgradeshouldbeverifiedbyarepresentativeofPanGLO.priortoplacingformsorrebar.Softsoilsencounteredatthefootingstihgradelevelshouldheover-e\catatedtocompetenthearingsoilandtheoer—excaationsshouldhehacktilleditlilean—mixconcrete.ControlDensit\Fill(CI)F)orstructuralfill.Weanticipatetheover—excavationof’footingsuhgradesoilna\heneededinthelocaliiedareas.FootingexcavationsshouldheohservedbyPanGEQtoconfirmthatthee\posedlootingsuhgradeisconsistentwiththeexpectedconditionsandadequatetost1pp)rtthedesignhearingpressure.usnsiflkd—I<ciuunRpPace5Paii([.f).tic. GeotechnicalEngineeringReportProposedRetailDevelopment—60SWSunsetBunlevard,Renton.WAOctober30.2013Surc’ht,ieSurchargeloads,wherepresent.shouldalsoheincludedinthedesignofretainingtalls.Werecommendthatalateralloadcoefficientof0.3beusedtocomputethelateralpressureonthewallfaceresultingfromsurchargeloadslocatedwithinahorizontaldistanceofone—halt’wallheight.Lttk’ralRc’cistt:iiceLateralforcesfromseismicloadingandunbalancedlateralearthpressuresmayheresistedbacombinationofpassiveearthpressuresactingagainsttheembeddedportionsofthefoundationsandbyfrictionactingonthebaseofthefoundations.Passiveresistancevaluesmaybedeterminedusinganequivalentfluidweightof3t)0pcf’.Thisvalueincludesafactorofsafetyof1.5,assumingthefootingispouredagainstdensenativesand,re-compactedon-sitesandysoilorproperlycompactedstructuralff11adjacenttothesidesoffooting.Africtioncoefficientof’0.3mayheusedtodeterminethefrictionalresistanceatthebaseofthefootings.ThecoefficientincludesafactorsafetyofI.5.WallDrainageProvisionsforva1ldrainageshouldconsistofa4-inchdiameterperforateddrainpipeplacedbehindandatthebaseofthewallfootings.embeddedin12to18inchesofcleancrushedrockorpeagravelwrappedwithalayeroffilterfabric.Whereapplicable,in-lieuofconventionalfootingdrains.teepholes(2”diameterof10Feetoncenter)maybeusedforsiteretainingalls.Aminimuml8-inchwidezoneof’t’reedraininggranularsoils(i.e.peagravelorashedrock)isrecommendedtobeplacedadjacenttothewallforthefullheightofthewall.Thedrainpipeatthebaseofthewallshouldbegradedtodirectwatertoasuitableoutlet.Wt,ilBuc’AjullInouropinion,theexistinuon—sitesoilissuitabletobere—usedasall.Wallbackfillshouldconsistofimported.freedraininggranularmaterial,suchasWSDO’IGraelt3orrow.Inareaswherethespaceislimitedbetweenthewallandthefaceofexcavation,peagravelnlaybeusedasbackfill\ithoutcompaction.WallhacktillshouldbeinoRtureconditionedtowithinabout3lerccnt0toptunurnmoisturecontent,placedinloose.horiiontalIiQslessthan8inchesinthickness,ands\steniatcalRcompactedtoadenseandrctaticlvtmnicidingconditionandtoatleast05percentof’theuamumdr\densit.asdetcrmnedusingtestmethodASI\1[)557.\\iiiin5Feetutthe5\SurleIIlRJ—l,iioniiPaee7Pan(il.Inc. GeotechnicalEngineeringReportProposedRetailDevelopment—60SWSunsetBoulevard,Renton,WAOctober30.2013mayalsoheconsideredasasourceofstructuraltill.Useofrecycledconcreteasstructuralfillshouldbeapprovedbythegeotechnicalengineer.STRtJCTLRALFILLPLACEMENToCoMPACTIoNStructuraltillshouldbemoistureconditionedtowithinabout3percentofoptimummoisturecontent,placedinloose,horizontalliftslessthan8inchesinthickness,andsystematicallycompactedtoadenseandrelativelyunyieldingconditionandtoatleast95percentofthemaximumdrydensity,asdeterminedusingtestmethodASTMD1557.Dependingonthetypeofcompactionequipmentusedanddependingonthetypeoffillmaterial,itmaybenecessarytodecreasethethicknessofeachliftinordertoachieveadequatecompaction.PanGEOcanprovideadditionalrecommendationsregardingstructuralfillandcompactionduringconstrtiction.WETWEA[HEREARTHWORKInouropinion,theproposedsiteconstructionmaybeaccomplishedduringtvetweather(suchasinwinter)withoutadverselyaffectingthesitestability.However,earthworkconstructionperibrmedduringthedriersummermonthslikelywillhemoreeconomical.Winterconstructionwillrequiretheimplementationofbestmanagementerosionandsedimentationcontrolpracticestoreducethechanceofoff-sitesedimenttransport.Someofthesitesoilscontainahighpercentageoffinesandaremoisturesensitive.Anytootingsuhgradesoilsthatbecomesoftenedeitherbydisturbanceorrainfallshouldberemovedandreplacedwithstructuralfill,ControlledDensityFill(CDF).orlean-mixconcrete.Generalrecommendationsrelativetoearthworkperformedinwetconditionsarepresentedbelow:•Sitestripping,excavationandsuhgradepreparationshouldhefollowedpromptlybytheplacementandcompactionofcleanstructurallillorUDE:•Thesiteandtpeofconstructionequipmentusedmahavetobelimitedtopreventsoilciisturhance;•Thegroundstirfacewithintheconstructionareashouldhegradedtopromoterun—oilofsurtheeaterandtopreventthepondingofater:•I3aIesofstraandorgeotextilesilttc’neesshouldbestrategicallylocatedtocontrolerosionandthemovementofsoil:-2ootoS\Sun’iflkJ.-IO.nkRtPaeC)Panül()_Inc. GeotechnicalEngineeringReportProposedRetailDevelopment—60SWSunsetBoulevard,Renton,WAOctober30.2013surfacegradientsshouldbeincorporatedintothegradingdesignsuchthatsurfacerunoffisdirectedawayfromstructures.ADDITIONALSERVICESToconfirmthatourrecommendationsareproperlyincorporatedintothedesignandconstructionoftheproposedaddition.PanGEOshouldberetainedtoconductareviewotthefinalprojectplansandspecifications.TheCityofRentonmayalsorequiregeotechnicalconstructioninspectionservices.PanGEOcanprovideyouacostestimateforconstructionmonitoringservicesatalaterdate.Weanticipatethatthefollowingadditionalserviceswillberequired:•Reviewfinalprojectplansandspecifications•Verifvimplementationoferosioncontrolmeasures:•Evaluateandconfirmthestabilityoftemporaryexcavationslopes:•Verifyadequacyoffootingsuhgrade:•Verifytheadequacyofsubsurfacedrainageinstallation:•Confirmtheadequacyoithecompactionofstructuralbackfill:and•otherconsultationasmayberequiredduringconstructionModilicationstoourrecommendationspresentedinthisreportmaybenecessary.basedontheactualconditionsencounteredduringconstruction.CLOSUREWehavepreparedthisreportforMr.RaymondNgandtheprojectdesignteam.Recommendationscontainedinthisreportarebasedonasitereconnaissance,asubsurfaceexplorationprogram.revie\ofpertinentsubstirt’aceinformation,andourunderstandingoftheproject.[hestudywasperformedusingamutuallagreed—upoiiscopeof\ork.\‘ariationsinsoilconditionsmayexistheteenthelocationsoftheexplorationsandtheactualconditionstinderitinthesite.Ihenatureandextentofsoilvariationsinantbeeidentuntilconstructionoccurs.IfantsoilconditionsareencocmteredatthesitethataredilThrentItonthosedescribedinthisreport.eshouldbentiliedimmcdiatelttorc.ietheapplicabilit’.ofI3-UI){‘‘,\\Suni01’dRniuntPaeIIPan(iii).Inc. GeotechnicalEngineeringReportProposedRetailDeelopment—60SWSunsetBoulevard,Renton,WAOctober30.2013Sincerely.SlewL.Tan.P.E.PrincipalGeotechnicalEngineerEnclosures:FigureIVicinityMapFigure2SiteandExplorationMapFigure3TermsandSymbolsfbrBoringandTestPitLogsFigure1LoofTestBorings131-I-IFigure5LogofTestBoringsBH-2MichaelH.Xue,P.E.SeniorGeotechnicalEngineerI\\SijnsII]—R.,ionII’tPage3Ian(,LO.Inc. zIiazE?-J<0rL.,—•c.L-;4.21--3tJ).00cia)D)00Ca)Ca)CozCC.-.C—cr;,c’),c—1)-çS•Pc/)7-‘wqIt0>-z0>Ca)20.0>(4,=CCa)0(00.0a7-to3-0-‘E\6?uL)UD/’[iL SANDIGRAVELSILTICLAYSPTApprox.RelativeSPTApprox.UndrainedShearDensityN-valuesDensity(%)Consistency:N-values:•Strength(psI)VeryLoose<4<15VerySoft<2<250Loose4tolO15-35:Soft-2to4250-500Med.DenselOto3O35-65Med.Stiff4to8500-1000Dense30to5065-85Stiff8to151000-2000VeryDense‘5085-100VeryStiff:15to302000-4000Hard>30>4000UNIFIEDSOILCLASSIFICATIONSYSTEMMAJORDIVISIONSGROUPDESCRIPTIONSLGWWell-gradedGRAVELGravelGRAVEL(<5%Fines)50%ormoreofthecoarseGPPoorly-gradedGRAVEL-fractionretainedonthe#4CR0:CIELsieve.Usedualsymbolsleg.GRAVEL(>12%fines)GP-GMIfor5%to12%knes.GCClayeyGRAVELSWWell-gradedSANDSandSAND(<5%fines)50%ormoreofthecoarseSPPoorly-gradedSANDfractionassingthe#4sieve.Useduarsymbotutog.SP-SM)SAND(>12%fines)-ItySAND.SCClayeySAND.MLSILTLiquidLimit50CLLeanCLAYSiltandClay:OLOrganicSILTorCLAY50%ormorepassing#200sieveMHElasticSILTLiquidLimit>50CHFatCLAYOHOrganicSILTorCLAYHighlyOrganicSoilsPTPEATLayered:Unitsofmatenaldistinguishedbycolorand/orFissured:BreaksalongdefinedplanescompositionfrommatenalunitsaboveandbelowSlickensided:FractureplanesthatarepolishedorglossyLaminated:Layersofsoiltypically005to1mmthick.max.1cmBlocky:AngularsoillumpsthatresistbreakdownLens:LayerofsoilthatpinchesoutlaterallyDisrupted:SoilthatisbrokenandmixedInterlayered:AlternatinglayersofdifferingsoilmatenalScattered:LessThanoneperfoolPocket:ErraticdiscontinuousdepositatlimitedextentNumerous:MorethanoneperfootHomoqeneous:SoilwithundormcolorandcompositionThroughoutBCN:AnglebetweenbeddingplaneandaplanenormaltocoreaxisCOMPONENTDEFINITIONSCOMPONENTSIZEISIEVERANGECOMPONENTSIZEISIEVERANGEBoulder:>12inchesSandCobbles:3to12inchesCoarseSand:#4to#10sieve1451020mm)GiavelMedlurniSand:#10to#40sieve(2.0toO42mm)CoarseGravel:3to3/4inchesFineSand:#40to#200sieve(042to0074mm)FineGravel:3/4inchesto#4sieveSilt0071toO002mm:Clay<0002mmPanGEeINCORPORATEDPhone:206.262.0370TESTSYMBOLSforInSituandLaboratoryTestslistedin‘OtherTests’column.AlTAttertergLimitTestCampCompactionTestsConConsolidationDDDryDensityDSDirectShear°AFFinesContentGSGrainSizePermPermeablittyPPPocketPenetrometerDryDustydiycIl:etouch1aistDampbutno,isiblewaterWetVisibletren-<daterRELATIVEDENSITYICONSISTENCYRR-valueSCSpecificGravityTVTorvaneTXCTriaxialCompressionUCCUnconfinedCompressionSYMBOLSSample/InSitutesttypesandintervals2-inchCDSplitSpoon,SPI(140-lb.hammer,30drop)N325-inchCDSpiltSpoon(300-lbhammer,30drop)Non-standardpenetrationtest(seebonnglogfordetails)Thinwall(Shelby)tubeGrabURockcoreNotes:1SoilexplorationtogscontainmatebaldescnptionsbasedonvisualobservationandheldtestsusingasystemmodifiedfromtheUniformSoilClassificationSystem(USCS).Wherenecessarylaboratorytestshavebeenconducted(asnotedinTheOTherTeslscolumn),unitdescnphonsmayincludeaclassificationPleaserefertothediscussionsinthereporttextforamorecompletedescriptionofthesubsurfaceconditions.2.ThegraphicsymbolsgivenabovearenotinclusiveofallsymbolsthatmayaepearontheboreholelsOthersymbolsmaybeusedwherefieldobservationsindicatedmixedsailconsfl)uentsordualconstituentmatenatsaneShearDESCRIPTIONSOFSOILSTRUCTURES2aMONITORINGWELLVGroundwaterLevelattimeofdrilling(ATD)YStaticGroundwaterLevelCementIConcreteSealBen/anilegrout!sealSilicasandbackfillSlottedtipSloughBottomofBoungMOISTURECONTENTTermsandSymbolsforBoringandTestPitLogsFigure3 Project.JobNumber:Location.Coordinates.ProposedRetailDevelopment13-20060SWSunsetBlvd.Renton,WashingtonNorthing..Easting—40’SurfaceElevation:TopofCasingElev.:DrillingMethod:SamplingMethod:HollowStemAugerSPTMATERIALDESCRIPTION46N-ValueAPLMoistureLL-1Unit1:FillMediumdense,moisttoverymoist,darkbrown-brown,sandySILT(ML)/siltySAND(SM).tracegravel.3440024681012Unit2:CompletelytohighlyWeatheredSandstoneLoose,verymoisttowet,brown,siltySAND(SM).tracefinegravel,completelyweatheredSANDSTONE.3611-Becomeslightbrown-orange,siltySAND(SM)withtracegravel,mediumdense,verymoisttowet,visualwaterontheupper12inchesofthesample.41213-Becomeslightbrown-brown,siltycouarseSAND(SM),mediumdense,verymoist,compeltelytohighlyweatheredSANTONE.2450/6-Becomesverydense,siltySAND,damptomoist,highlyweatheredSANDSTONEBoringterminatedatabout11feetbelowthesurfacePerchedgroundwateratabout5feetduringdrilling.14‘16———CompletionDepth11OftDateBoreholeStailedDateBoreholeCompletedLirtgedByDrillingCompanyPanGEE’IrdCORPORATEDRemarksAckerPortableDillRigStandardPenetrationTestISPT)sainpk?rlrivenwitha9/11/13140lbhammerusingaropeandcatimeaddropping30inchesperstrokeCJ/11/13HMXCNDrillingLOGOFTESTBORINGBH-2Figure5Thesrmti[icationlinesrepresentapproximatebou,daresThetranstionnaybegradualSheet1of1