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D_Franco CAE Decision_190919.pdf
CRITICALAREASEXEMPTION(FORSEPAEXEMPTACTIVITIES)PlanningDivision1055SouthGradyWay-Renton,WA98057Phone:425-430-7200Fax:425-430-7231ApplicantNameProjectNamePhoneNumberMarlandFrancoFrancoSlopeStabilization206-265-9280ParcelNumberProjectAddress19381000502855BlameAveNEBriefDescriptionofProjectReplantingprotectedslopealteredwithoutapermit(CODE18-000671).Ageotechnicalreport(PreparedbyAssociatedEarthSciencesIncorporated,datedJuly25th,2019)andareplantingplanwassubmittedwiththeapplication.TypeofCriticalArea:HighLandSlideHazardareaandWorkOccursinEWorkOccursinprotectedslopes(40-90%)CriticalAreaBufferPURPOSE:ExemptactivitiesprovidedwithaletterofexemptionfromtheDevelopmentServicesAdministratormayintrudeintoacriticalareaorrequiredbuffer(SubjecttoanyconditionsorrequirementsprovidedbytheAdministrator).APPLICABILITYOFEXEMPTIONS:Thefollowingisagenerallistofactivitiesthatmaybeexemptfromthecriticalareasregulations.MorespecificdescriptionsoftheactivitiesarecontainedintheCriticalAreasRegulations.Someofthelistedactivitiesmaynotbeexemptincertaincriticalareas.ThePlanningDivisionwillevaluateyourequestaccordingtotheCityofRentonCriticalAreasRegulationsinRMC4-3-050C,J,L,andN.IAMREQUESTINGACRITICALAREASEXEMPTIONFORONEORMOREOFTHEFOLLOWINGACTIVITIES:Conservation,Enhancement,andRelatedActivities:•Conservationorpreservationofsoil,water,vegetation,fish,andotherwildlife•Enhancementactivitiesasdefinedinchapter4-11RMCD’•Anycriticalarea,bufferrestoration,orothermitigationactivitiesthathavebeenapprovedbytheCityDResearchandSiteInvestigation:•Nondestructiveeducationandresearch•Siteinvestigativeworknecessaryforlanduseapplicationsubmittalssuchassurveys,soiltogs,etc.ElAgricultural,Harvesting,andVegetationManagement:•Harvestingwildfoods•Existing/Ongoingagriculturalactivities1c;\users\amorganroth\AppData\Local\Temp\246c2d3e•o2sa-46s6-afe4-g7csGog8dGdf\A_criticaiAreasAppiication_190910_vl.docx •Removalofdead,terminallydiseased,damaged,ordangerousgroundcoverorhazardoustreeswhichhavebeencertifiedassuchbyaforester,registeredlandscapearchitect,orcertifiedarboristDSurfaceWaterAlteration:•NewsurfacewaterdischargesprovidedthedischargemeetstherequirementsoftheStormandSurfaceWaterDrainageRegulations123•Newormodifiedregionalstormwaterfacilities123•Floodhazardreduction1346DRoads,Parks,PublicandPrivateUtilities:•RelocationofExistingUtilitiesoutofCriticalAreaandBuffer•Maintenance,operation,andrepairofexistingparks,trails,roads,facilities,andutilities12•Installation,construction,replacement,oroperationofutilities,trafficcontrol,andwalkwayswithinexistingimprovedright-if-wayoreasement12•Modificationofexistingutilitiesandstreetsby10%orless125•Managementandessentialtreeremovalforpublicorprivateutilities,roadsandpublicparks1DWetlandDisturbance,Modification,andRemoval:•AnyactivityinsmallCategory3wetlands12345•Temporarydisturbancesofawetlandduetoconstructionactivitiesthatdonotincludepermanentfilling1235DMaintenanceandConstructionforExistingUsesandFacilities:•Remodeling,replacing,orremovingexistingstructures12•Normalandroutinemaintenanceandrepairofanyexistingpublicorprivateusesandfacilitieswherenoalterationofthecriticalareaandrequiredbufferoradditionalfillmaterialswillbeplaced12•Constructionactivityconnectedwithanexistingsinglefamilyresidenceorgarage,providedthatnoportionofthenewworkoccursclosertothecriticalareaorrequiredbuffersthantheexistingstructureand/orthedevelopedareaofthesite12•Existingactivitieswhichhavenotbeenchanged,expandedoralteredprovidedtheycomplywiththeapplicablerequirementsofchapter4-10RMC1DEmergencyActivities:•RemovaloftreesorgroundcoverbyaCitydepartment,agency,public,orprivateutilityinanemergencysituation•Publicinterestemergencyuse,storage,andhandlingofhazardousmaterialsbygovernmentalorganizationsinanAquiferProtectionAreaADDITIONAl.PERMITS:Additionalpermitsfromotheragenciesmayberequired.Itistheapplicant’sresponsibilitytoobtaintheseotherapprovals.Informationregardingtheseotherrequirementsmaybefoundathttp://apps.ecy.wa.gov/opas/C:\Users\amarganroth\AppData\local\Temp\246c2d3e-025a-4656-afe4-97056088d6df\A_CriticaIAreasApplicatian_190910_vldocx I,theundersigned,declareunderpenaltyofperjuryunderthelawsoftheStateofWashington,thattothebestofmyknowledgetheaboveinformationistrueandcomplete.ApplicantSignature:MarlandFranco9/9/2019(digitalsignature)_Date:_______________________ForCityUseOnlyExemptionGrantedDExemptionDeniedJenniferT.Henning,PlanningDirectorDatePlanningDivisionConditionsofApproval:1.TheapplicantshallreplantthedisturbedareaaccordingtotheReplantingPlanforSlopeAreasubmittedwithapplication(Exhibit1).Allplantsshallbeatleastatwo(2)galloncontainersizeatplanting.2.Theapplicantshallremovethesmallretainingwall/debrisfromthe15-footprotectedslopestructuresetback.3.Theapplicantshallinstallerosiongeo-fabricsuchasjutemattingorequivalent,asrecommendedbythesubmittedgeotechnicalreportpreparedbyAssociatedEarthSciences,IncanddatedJuly25,2019(Exhibit2).4.Theapplicantshallplantfiveadditional‘tassel’ferns(Polystichumsp.),oranothersubstituteapprovedbytheCurrentlyPlanningProjectManagerifnotavailable,neartheeastpropertyline.Locationsfortheadditionalplantingshavebeenmarkedbystaffingreenonthesubmittedplantingplan(Exhibit1).5.TheapplicantshallcontacttheCurrentPlanningProjectManagerat(425)430-7219afterthereplantingandslopestabilizationiscompleteforalandscapeinspection.‘ExemptiondoesnotapplyinAquiferProtectionAreas2ExemptiondoesnotapplyinFloodHazardAreas3ExemptiondoesnotapplyinGeologicHazardAreas4ExernptiondoesnotapplyinHabitatConservationAreas5fxemptiondoesnotapplyinStreamsandLakes:Class2to46ExemptiondoesnotapplyinWetlandsC:\Users\amorganroth\Appoata\Local\Temp\246c2d3e-025a.4656-afe4-97056088d6df\A_criticalAreasApplication_190910_vl.docx ReplantingPlanforSlopeArea--Exhibft1 No associatedearthsciencesincorporatedJuly25,2019ProjectNo.190275E001Mr.MarlandFranco2855BlameAvenueNERenton,Washington98056Subject:LimitedGeotechnicalReportSteepSlopeRestoration2855BlameAvenueNERenton,WashingtonDearMr.Franco:ThepurposeofthisletteristorespondtoarequestforageotechnicalreportbytheCityofRenton(City)PlanningDivision.Atyourrequest,AssociatedEarthSciences,Inc.(AESI)recentlyperformedageotechnicalreconnaissanceoftheslope,andreviewedavailablegeotechnicalandgeologicinformationinthevicinityofthesite.Nosubsurfaceexplorationsortestingofsoilwasperformed.SITEDESCRIPTIONWeunderstandthatbackyardofyourresidencelocatedat2855BlameAvenueNEinRenton,Washingtonisadjacenttoamoderatelyforestedsteepslope.Youinformedusthatyouplacedpiecesofbrokenconcreteonasmallareanearthetopoftheslopewhichwasrelativelyfreeofvegetationtoprovidesomearmoringforerosion.Weunderstandthatintheprocessofdoingthiswork,yourneighborcontactedtheCityofRentontoreportthatyouwerecompletingworkinacriticalareawithouttheappropriateCitypermit.TheCitynotifiedyouthatyouwereinviolationandrequiredageotechnicalengineertoobservetheworkareaandprovideconclusionsregardingtheimpacttoslopestabilityandproviderecommendationsasnecessarytomitigatetheareadisturbedontheslope.SLOPECONDITIONSAnexperiencedgeotechnicalengineerfromourfirmvisitedthesite,metwithyouandobservedthecurrentslopeconditionsonJuly2,2019.TheareaofconcernislocatednearthetopofaExhibit2KirklandOfficeI911FifthAvenueIKirkland,WA98033pI425.827.7701MountvernonOfficeI5085.SecondStreet,Suite101IMountvernon,WA98273pI425827.7701TacomaOfficeI1552commerceStreet,Suite102ITacoma,WA98402pI253.722.2992Www.aesgeo.com FrancoResidenceRenton,WashingtonLimitedGeotechnicalReportnorthern-facingsteepslopethatisapproximately30feettallbasedonreviewoftopographicinformationfromtheKingCountyiMapwebsite.Theslopedescendsataninclinationestimatedtobefrom80to100percent.Theareaisroughlytriangularandmeasuresabout10feetwideatthetopandnarrowstoapointabout15feetdowntheslope.Theareaismostlycomprisedofexposedsoilwithscatteredconcreterubblepiecesacrosstheslopewithsometopsoilandlandscapingdebris.Asmallpileofstackeddriedwoodtreebranches/limbswaspresentatthetopoftheslope.Establishedvegetationoneithersideoftheareaconsistsofivy,smallfernswhichprovidegroundcover,andpredominantlylarge-diametertreesthatprovideathickoverheadcanopy.Theslopeisrelativelycontinuouswithsimilarslopeinclinationandvegetationonadjacentpropertiestotheeastandwestofthesite.WereviewedLightDetectionandRanging(LIDAR)data,whichisaremotesensingtechnologythatmeasuresdistancetoatargetbyilluminatingthattargetwithapulsedlaserlight,andmeasuringthereflectedpulseswithasensor.ReviewoftheLIDARtopographydoesnotindicatehistoriclarge-scalelandslidingatoradjacenttothesite.CityofRentonSensitiveAreasMap(November12,2014)indicatesthatthesiteandneighboringpropertiesareconsideredtohavea“Moderate”landslidehazardseverity.SUBSURFACECONDITIONSWeinterpretedsubsurfaceconditionsatthesitebasedonreviewofavailablegeologicmappingandobservationsmadeduringoursitereconnaissance.Handprobingwitha¾-inchdiametersteelt-rod,intotheslopeofabout24inchespenetrationindicatesthesurficialsoilsareloose.Geologicmappingindicatesthesitetobeunderlainbypre-Fraserfine-graineddeposits(DerekB.Booth,KathyA.Troost,andAaronP.Wischer,GeologicMopofKingCounty,Washington,March2007).Thepre-Fraserfine-graineddeposittypicallyconsistsofglaciallyoverriddensiltandclay.CONCLUSIONSANDRECOMMENDATIONSInouropinion,theactionofplacingtheconcreterubblepiecesonthesteepslopebelowyourpropertyhasnotincreasedtheexistinglandslidehazardrisk.Thebiggestissueinouropinionwouldbeprotectingthisareafromfutureerosion.Werecommendrevegetationoftheportionoftheslopethathasbeendisturbedtominimizethepotentialforerosion.Giventherelativelysmallareaandsteepnessoftheslope,practicalrepairoptionsaresomewhatlimited.Inouropinion,themostcost-effectiveapproachgiventheshadyconditionsduetothevegetationcanopy,wouldbetoplantsimilarnativevegetationinthisareathatexistsontheslopesuchasfernscombinedwithanerosiongeofabricsuchasjutematting.WhileuseofageocellproductcouldbeconsideredforJuly25,2019ASSOCIATEDEARTHSCIENCES,INC545/ms-190275E001-2-Pmjects20190167KEWPPage2 FrancaResidenceRenton,WashingtonLimitedGeotechnicalReportsteepslopeapplicationswithdifficultrevegetationissues,weconsideruseofgeocellinthisparticularcaseexcessive.CLOSUREWetrustthislettermeetsyourcurrentneeds.Shouldyouhaveanyquestions,pleasecontactusatyourconvenience.Sincerely,ASSOCIATEDEARTHSCIENCES,INC.Kirkland,WashingtonStephenA.Siebert,RE.AssociateGeotechnicalEngineerJuly25,2019545/ms-1902?SEOOI-2-Projects\20I9O16?KE1WPASSOCIATEDEARTHSCIENCES,INC.Page3I’llMatthewA.Miller,P.E.PrincipalEngineer