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Home My WebLink AboutERC Report and Exhibits Final_LUA16-000922 Talbot Hill SubstationDEPARTMENTOFCOMMUNITYANDECONOMICDEVELOPMENT—iz;conENVIRONMENTALREVIEWCOMMITTEEREPORTERCMEETINGDATE:January23,2017ProjectName:TalbotHillSubstationImprovementsProjectNumber:LUA16-000922,ECF,SA-H,ProjectManager:AngeleaWeihs,AssociatePlannerOwner:PugetSoundEnergy,Inc.;P0Box97034MISPSE-09N,Bellevue,WA98009Applicant/Contact:JeffMcMeekin;P0Box97034MISPSE-09N,Bellevue,WA98009ProjectLocation:2400SPugetDriveProjectSummary:PSEisrequestingHearingExaminerConditionalUsePermit,Environmental(SEPA)Review,andSitePlanReviewforproposedlalbotHillSubstationimprovementslocatedat2400SPugetDr.(parcelnumbers2023059003and2023059066).Theprojectsitetotals50.4acresandiszonedResidential-8(R-8).PSEisproposingtorebuildaportionoftheTalbotHillSubstationinordertoreplaceagingequipmentandprovidemorereliabilityforthetransmissionlinesconnectedtothesubstation.Theexistingcontrolhousewillbedemolishedandanewcontrolhouseisproposedinitsplace.Theexisting230kVsubstationequipmentinsidethefenceisproposedtoberemoved,includingsteelstructuresandfoundations.Noadditionaltransmissionlinesareproposedwiththerebuildofthisproject.Anewstormdrainagesystemisproposedwithinthefencedareaandadetentionpondwillbeinstalledsouthofthesoutherlysubstationfence.Thedetentionpondwillinvolveanexcavationofmorethan500cubicyards,whichtriggersSEPAReview.Thesubstationfootprintwillremainunchanged.Additionaldrivewayimprovementsareproposedtoallowlargervehicleaccesstothesubstation.Theprojectsitecontainsmoderatecoalminehazards,moderatelandslidehazards,andsensitiveslopes(within50feet).TheapplicanthassubmittedanArboristReportandGeotechnicalEngineeringStudywiththeapplication.Exist.Bldg.AreaSF:999SFProposedNewBldg.Area(footprint):1,449SFProposedNewBldg.Area(gross):1,449SFSiteArea:50.4acresTotalBuildingAreaGSF:2,448SFSTAFFStaffRecommendsthattheEnvironmentalReviewCommitteeissueaDeterminationofRECOMMENDATION:Non-Significance-Mitigated(DNS-M).i.—;IProjectLocationMapERCReport_LUA16-000922TalbotHillSubstation CityofRentonDepartmentofCommunity&EconomicDevelopmentEnvironmentalReviewCommitteeReportTalbotHillSubstationImprovementsLUA16-000922,ECF,SA-H,ReportofJanuary23,2017Page2of6PARTONE:PROJECTDESCRIPTIONIBACKGROUNDPSEisrequestingaHearingExaminerConditionalUsePermit,Environmental(SEPA)Review,andSitePlanReviewforproposedTalbotHillSubstationimprovementslocatedat2400SPugetDr.(parcelnumbers2023059003and2023059066).Theprojectsitetotals50.4acresandiszonedResidential-8(R-8).PSEisproposingtorebuildaportionoftheTalbotHillSubstationinordertoreplaceagingequipmentandprovidemorereliabilityforthetransmissionlinesconnectedtothesubstation.Thesubstationfootprintwillremainunchanged.Thesubjectproposalisbeingreviewedindependentlyandseparatelyfromallotherproposals,includingEnergizeEastside(theproposaltobuildnewelectricaltransmissioninfrastructure),thatincludethissite.TheTalbotHillSubstationwasconstructedintheearly1960sandisalegallyestablisheduse.AConditionalUsePermitwasnotrequiredatthetimeofconstruction;however,duetotheupgradesofthefacility(enlargementofcontrolhouse)anewConditionalUsePermithasbeentriggered.Theexistingcontrolhouse(999squarefeet)wouldbedemolishedandanewcontrolhouse(1,449squarefeet)wouldbeconstructedinitsplace.TheproposednewcontrolhouseexceedsthemaximumheightforaccessorystructureswithintheR-8zone(total18feettohighestpoint)by1footand4inches,andthereforerequiresapprovalofaHearingExaminerConditionalUsePermit.Theexisting230kVsubstationequipmentinsidethefenceisproposedtoberemoved,includingsteelstructuresandfoundations.Thenewequipmentwillbereconfiguredtocreateamoreefficientandmorereliablesubstationandallowforflexiblefunctioningofthesystem.Theproposalincludessometransmissionlineworkoutsidethesubstationfence;however,noadditionaltransmissionlinesareproposedwiththerebuildofthisproject.Anewstormdrainagesystemwillbeconstructedwithinthefencedareaandadetentionpondwillbeinstalledsouthofthesoutherlysubstationfence.Thetotaldisturbedareawillequalapproximately227,370squarefeet.Thecutwillbeapproximately11,500cubicyardsandthefillwillbeapproximately9,000cubicyards.Thestormimprovementswouldrequiretheremovalof69trees.Theapplicantproposestoremove11significant(Douglasfir)treestothewestoftheentrancedriveway(outsideoftheproposeddrainagepond)alongthesouthsideofthesubstation.Additionaldrivewayimprovementsareproposedtoallowlargervehicleaccesstothesubstation.Theprojectsitecontainsmoderatecoalminehazards,moderatelandslidehazards,andsensitiveslopes(within50feet).TheapplicanthassubmittedanArboristReportandGeotechnicalEngineeringStudywiththeapplication.PARTTWO:ENVIRONMENTALREVIEWIncompliancewithRCW43.21C.240,thefollowingenvironmental(SEPA)reviewaddressesonlythoseprojectimpactsthatarenotadequatelyaddressedunderexistingdevelopmentstandardsandenvironmentalregulations.A.EnvironmentalThresholdRecommendationBasedonanalysisofprobableimpactsfromtheproposal,staffrecommendsthattheResponsibleOfficials:IssueaDNS-Mwitha14-dayAppealPeriod.B.MitigationMeasures1.TheapplicantshallsubmitarevisedGeotechnicalreport,updatedtothe2015IBCdesignparameters,withconstructionandbuildingpermitapplication,andtheprojectshallfollowtherecommendationsoftherevisedGeotechnicalreport.C.ExhibitsExhibit1ERCReportExhibit2NeighborhoodDetailMapERCReport_LUA1G-000922TalbotHillSubstation City of Renton Department of Community & Economic Development Environmental Review Committee Report Talbot Hill Substation Improvements LUA16-000922, ECF, SA-H, Report of January 23, 2017 Page 3 of 6 ERC Report_LUA16-000922 Talbot Hill Substation Exhibit 3 Site Plan Exhibit 4 Tree Removal and Landscape Plan Exhibit 5 Access Road and Grading Plan Exhibit 6 Geotechnical Engineering Study prepared by GeoEngineers, Inc. (December 5, 2016) Exhibit 7 Technical Information Report prepared by HDR Engineering, Inc. (November 16, 2016) Exhibit 8 Arborist Report prepared by Otak Inc. (December 13, 2016) Exhibit 9 Construction Mitigation Description Exhibit 10 Advisory Notes to Applicant D. Environmental Impacts The Proposal was circulated and reviewed by various City Departments and Divisions to determine whether the applicant has adequately identified and addressed environmental impacts anticipated to occur in conjunction with the proposed development. Staff reviewers have identified that the proposal is likely to have the following probable impacts: 1. Earth Impacts: A geotechnical report (Exhibit 6), dated December 5, 2016, completed by GeoEngineers, Inc. was submitted with the application. The project site contains moderate coalmine hazards, moderate landslide hazards and sensitive slopes (within 50 feet). Erosion control measures would need to be in place prior to starting grading activities on the site. The report discusses the soil and groundwater characteristics of the site including infiltration potential and provides recommendations for project design and construction. The report discounts the use of infiltration for the site due to the depth of the outwash soils compared to the existing surface elevations present on the site. Geotechnical recommendations presented would need to be addressed within the project plans and construction/building permit submittal. According to the report, the soils mapped in the project vicinity are predominantly glacial till, but include localized areas of ice-contact glacial deposits overlying the till. The extent of disturbance will be approximately 5.89 acres. The cut will be approximately 11,500 cubic yards and the fill will be approximately 9,000 cubic yards. Approximately 4.17 acres will consist of gravel road and surface improvements. Another 1.22 acres will be for the installation of new foundations and Spill Prevention, Control, and Countermeasures (SPCC) structures. The remaining 0.5 acres will be for installation of a stormwater detention pond. The report states that the site is mapped in a moderate coal mine hazard area; however, based on the depth of historical coal mining activity and the relatively shallow depth of the proposed improvements, there is a low coal mine hazard at the site. The report identifies that the site is mapped in a 25 to 40 percent steep slope area and in a moderate landslide hazard area; however, the geotechnical engineer has concluded that the proposed improvements would not adversely affect the stability of the slopes in or around the site. Based on the provided report, the soils underlying the substation site have a low risk of liquefying under the design earthquake event and a low risk of lateral spread and earthquake-induced slope movement. The site is approximately 5 miles south of the Seattle Fault Zone, which is thought to have a recurrence interval on the order of 1,000 years. Based on the distance from the nearest mapped fault, there is a low risk of fault rupture at the site. GeoEngineers understand that the stormwater pond is planned with 2H:1V (horizontal:vertical) side slopes and a depth of up to 7 feet in the middle. They recommend that the side slopes be protected from erosion. CityofRentonDepartmentofCommunity&EconomicDevelopmentEnvironmentalReviewCommitteeReportTalbotHillSubstationImprovementsLUA16-000922,ECF,SA-H,Reportofianuary23,2017Page4of6Temporaryerosionprotectionshouldbeusedandmaintainedinareaswithexposedordisturbedsoilstohelpreducethepotentialforerosionandreducetransportofsedimenttoadjacentareasandreceivingwaters.Temporaryerosionprotectionshouldincludetheconstructionofasiltfencearoundtheperimeteroftheworkareapriortothecommencementofgradingactivities.Permanenterosionprotectionshouldbeprovidedbyre-establishingvegetationorsurfacingwithrock.Untilthepermanenterosionprotectionisestablishedandthesiteisstabilized,sitemonitoringshouldbeperformedbyqualifiedpersonneltoevaluatetheeffectivenessoftheerosioncontrolmeasuresandrepairand/ormodifythemasappropriate.Provisionsformodificationstotheerosioncontrolsystembasedonmonitoringobservationsshouldbeincludedintheerosionandsedimentationcontrolplan,whichshallbesubmittedtotheCitywiththeConstructionPermitapplication.TheGeotechnicalreportshouldbeupdatedto2015IBCdesignparameters,asthecurrentstudywasnotcompliant.Thegeotechnicalreportincludesspecificrecommendationsfor:sitepreparation,shallowandmatfoundations,drilledshafts,retainingwalls,earthwork,temporaryslopes,erosionandsedimentationcontrol,andthestormwaterpond.Therefore,staffrecommends,asamitigationmeasure,thatarevisedGeotechnicalreport,updatedtothe2015BCdesignparameters,shallbesubmittedwithconstructionpermitapplicationandtheprojectshallfollowtherecommendationsoftherevisedGeotechnicalreport.MitigationMeasures:TheapplicantshallsubmitarevisedGeotechnicalreport,updatedtothe2015IBCdesignparameters,withconstructionpermitapplicationandtheprojectshallfollowtherecommendationsoftherevisedGeotechnicalreport.Nexus:SEPAEnvironmentalReview,RMC4-3-050CriticalAreasRegulationsandRMC4-4-060Grading,ExcavationandMiningRegulations2.AirImpacts:Itisanticipatedthatsometemporaryairqualityimpactscouldbeassociatedwithsiteworkandbuildingconstructionrequiredtodevelopthissite.Projectdevelopmentimpactsduringconstructionmayincludedust,resultingfromgradingandexhaustfromconstructionvehicles.Dustcontrolwouldbemitigatedthroughtheuseofwateringofthesiteasneeded.Nofurthersitespecificmitigationfortheidentifiedimpactsfromtypicalvehicleandconstructionexhaustisrequired.MitigationMeasures:Nofurthermitigationrecommended.Nexus:N/A3.Watera.StormWaterImpacts:APreliminaryDrainagePlanandTechnicalInformationReport(TIR)(Exhibit7),datedNovember16,2016,wassubmittedbyHDREngineering,Inc.withtheLandUseApplication.BasedontheCityofRenton’sflowcontrolmap,thesitefallswithintheFlowControlDurationStandardareamatchingForestedSiteConditionsandiswithintheLowerCedarRiverandBlackRiverDrainageBasin.ThedevelopmentissubjecttoFullDrainageReviewinaccordancewiththe2009KingCountySurfaceWaterDesignManual(KCSWDM)andthe2010CityofRentonAmendmentstotheKCSWDM.AllcorerequirementsandthesixspecialrequirementsarediscussedintheTechnicalInformationReport.AsstatedintheTIR,theproposedimprovementswouldoccurontheeasternsideofthesubstation(referredtoastheprojectarea),andwouldincludetheinstallationoffoundations,securityperimeterfence,landscapescreening,pavingofasmallportionoftheaccessroad,installationofanewstormwaterdrainageandflowcontrolsystem,roadmaintenance,andon-siteoilspillcontrolbestmanagementpractices(BMPs).Theextentofdisturbancewillbeapproximately5.89acres.Approximately4.17acreswillconsistofgravelroadandsurfaceimprovements.Another1.22acreswillbefortheinstallationofnewfoundationsandSpillPrevention,Control,andCountermeasures(SPCC)structures.Theremaining0.5acreswillbeforinstallationERCReport_LUA16-000922TalbotHillSubstation CityofRentonDepartmentofCommunity&EconomicDevelopmentEnvironmentalReviewCommitteeReportTolbotHillSubstationImprovementsLUA16-000922,ECF,SA-H,ReportofJanuary23,2017Page5of6ofastormwaterdetentionpond.Theexistingsitecontainselectricalstructures,andyardrockcoversthegroundsurface.Ingeneralstormwaterrunoffflowsoutwardsfromthemiddleofthesubstation.Existingdrainagepipesonthenortheastandsoutheastsidesofthesubstationaretiedtocatchbasinswithinthefencelinewhoserimsareslightlyraisedabovetheyardrock,preventingthemfromcapturingflow.Theperimeterpathonthenortheasternsideofthesubstationishigherthantheexistinggradewithinthefenceline,preventingflowfromdrainingoffthesitealongthisedge.Anelevatedfieldalongtheeasternedgeofthesitepreventsdrainageawayfromthesubstationonthisside.Runoffalongthenortheastern,eastern,andsoutheasternsidesofthesubstationthereforetendstopondwithinthesubstationandinfiltrate.Alongthesouthernedgeofthesubstation,runoffisabletoflowsouthacrossthesouthernperimeterpathandintoadepressionlocatedbetweenthesubstationandaccessroad.Thisroutepresentsthepathofleastresistanceforstormwater.Thedepressionisdrainedbyaculvertbeneaththeaccessroadtoaseconddepressionwhichdrainseastwards,towardsGrantAvenueSouth.Proposedconditionswouldincludeare-gradedgravelsurfacewithinthesubstation(approximately3.43acres),additionalSPCCstructuresandequipmentfoundations(approximately1.22acres),re-gradingofgravelandasphaltroads(approximately0.74acres),andtheadditionofapondforflowcontrol(approximately0.5acres).Theproposedconditionswouldincreaseimperviousareaatthesitebyapproximately15%.ThispercentageisprimarilyduetotheadditionoftheSPCCstructuresandequipmentfoundations,aswellasasphaltentriestothegravelaccessdriveways.Yardrocksurfaceswouldonlybereplacedorre-graded,theywouldnotbeadded.Drainageimprovementsincludeanewstormwaterconveyancenetworkinsidethesubstationwhichwouldrouteflowstoa75,000cubicfootstormwaterdetentionpondlocatedalongthesoutheasternedgeofthesubstation.Thispondwoulddischargetoadepressiononthesouthernsideoftheexistingaccessroad,whereflowwouldresumetheexistingdrainagepathtowardsGrantAvenueSouth.Asnotedinthereport,theapplicantisexemptfromwaterqualitysincethenewplusreplacedpollutiongeneratingimpervioussurface(PGIS)areaislessthan5,000squarefeet.Anychangestotheredevelopmentprojectwhichresultsingreaterthan5,000squarefeetofPGISarea,asdefinedbythe2009KCSWDM,maytriggerwaterqualityfacilitiestobeprovided.MitigationMeasures:Nofurthermitigationrecommended.Nexus:N/A4.VegetationImpacts:AnArboristReportpreparedbyOtakInc.,datedDecember13,2016(Exhibit8),wassubmittedwiththeLandUseapplication,inadditiontoaStormwaterPondTreeRemovalandLandscapingPlan(Exhibit4).Atotalof116treeswereevaluatedasapartofthisproposal.TheexistingtreesontheprojectsiteincludeDouglasfirs,Pacificdogwood,Bigleafmaple,Madrone,Alder,Willow,Hawthorn,BeakedHazelnut,andCottonwood.Perthearboristreport,themajorityofthetreesareingoodshapewiththeexceptionofthewillowandalder,whichhavebeendamagedbyrecentbranchfailuresduringthespringwindstorms.TheArboristReportstatesthatthegradingofthestormwaterpondwouldrequireremovalofsignificanttrees.Atotalof69treesareproposedforremovalwithinthestormwaterpondareaperthesubmittedtreeremovalplan.Theapplicantproposestoremove11significant(Douglasfir)treestothewestoftheentrancedriveway(outsideoftheproposeddrainagepond)alongthesouthsideofthesubstation.Thereportstatesthatthemajorityofthesetreesarereachingaheightinwhichtheirrisktowardthesubstationisenhancedduetotheprevalenceofwindblownlimbsdamagingequipmentwithinthesubstation.Theexistingshrubsandsmallertreesinthisareaareproposedtoremainasaviewbufferforthesouthernneighbors.Noalternativestotreeremovalforthe11DouglasfirswasprovidedwithintheArboristReport,nordidthereportprovideexplanationforwhytheDouglasfirtreescouldnotbetrimmedasasolutiontopreventdamagetotheequipmentwithinthesubstation,ratherthantreeremoval.Therefore,staffwillbeERCRep0rtLUA1G-000922TalbotHillSubstation CityofRentonDepartmentofCommunity&EconomicDevelopmentEnvironmentalReviewCommitteeReportTalbotHillSubstationImprovementsLUA16-000922,ECF,SA-H,Reportofianuary23,2017Page6of6recommendingaconditionofSitePlanapprovaltoaddresstheseconcernspriortoconstructionpermitapproval.MitigationMeasures:Nofurthermitigationrecommended.Nexus:N/AE.CommentsofReviewingDepartmentsTheproposalhasbeencirculatedtoCityDepartmentandDivisionReviewers.Whereapplicable,theircommentshavebeenincorporatedintothetextofthisreportand/or“AdvisoryNotestoApplicant.”VCopiesofallReviewCommentsarecontainedintheOfficialFileandmaybeattachedtothisreport.TheEnvironmentalDeterminationdecisionwillbecomefinalifthedecisionisnotappealedwithinthe14-dayappealperiod(RCW43.21.C.075(3);WAC197-11-680).EnvironmentalDeterminationAppealProcess:Appealsoftheenvironmentaldeterminationmustbefiledinwritingtogetherwiththerequiredfeeto:HearingExaminer,CityofRenton,1055SouthGradyWay,Renton,WA98057,onorbefore5:00p.m.onFebruary10,2017.RMC4-8-110governsappealstotheHearingExaminerandadditionalinformationregardingtheappealprocessmaybeobtainedfromtheCityClerk’sOffice,RentonCityHall—7thFloor,(425)430-6510.ERCReport_LUA16-000922TalbotHillSubstation CDCDC)00-0-b.OC)zxw I I PUGET TALBOT HILL SOUND SUBSTATION ENERGY 230KV SWITCHYARD N \RENTON SE SECTION 30,TOWNSHIP 23 NORTH,RANGE 5 EAST,W.M. DRAWING LIST: DWG NO:SHT NO:TITLE: O—2N67R 1 FOUNDATION REMOVAL PLAN SHEET I OF 3D—2867R 2 FOUNDATION REMOVAL PLAN SHEET 2 OF 3O—2967R 3 FOUNDATION REMOVAL PLAN SHEET 3 OF 3D—28TT0 1 STRUCTURAL REMOVAL PLAN 0—18731 1 TOPOGRAPHIC SURVEY SHEET 1 OF 52TOPOGRAPHICSURVEYSHEET2OFS 5 GPGGRAPHIC SURVEY SHEET S CF 53-18732 1 TEMPORARY EROSION/SEDIMENT CONTROL 2 EMPORARY EROSITN/SETIMENT CONTROL 3 TEMPORARY EROSWN/SEOIMENT CONTROL OETAILSO—18T34 1 GRADING ANO FENCING PLAN 230KV SWJTCHAARO 3 GRATING SECTIONS ANT OETAIS 2 DRAINAGE SECTIONS AND AETAILS — 2 DETENTION PONT SFCTITNS AND DETAILS0—18738 1 FOUNDATION PLAN SHEET 1 OF 22FOUNDATiONPLANSHEET2AF2 0—18739 1 STRUCTURAL PLAN SHEET 1 OF 22STRUCTURALPLANSHEET2OF20—18746 1 V:SuAL BARRIER PLANTING PLAN S[IEET 1 OF 42VISUALBARRIERPLANTINGPLANSHEET2OF43VISUALBARRIERPLANTINGPLANSHEET3OF44VISUJALBARRIERPLANTINGPLANSHEET4OF4 SURVEY NOTES (CONTINUED)LEGAL DESCRIPTION PARCEL $202305—90B3: PARCEL a2O23O5—9O6: SURVEY NOTES 1.PORPOSE OF THIS SURVEY 2.BASIN OF TEARINO 3.VERTICAL DATUM 5.TETH000LBOY / /, /‘--z-,‘ .,/Z L11 AREA PLAN 7.MONUMENT AISITAION 9.IINDERGRTEND UTILUJG.3 1OCON000R INTERVAL l1.SU8SABFACE CONDITIONS 12.1—800—424—5555 GENERAL NOTES PSE ENGINEERING CONTACTS :ONSCTLTI?T JEFFMEBN 425-914-8621 ANL7IO GRAPHIC SCALE EXHIBIT 3 t/CALL BEFOREIIj:z you DIG I V Call:TOLL FREE IL1-8OO-424) 88010104 0€£C8IYlAM:8BNAMB6:1flA22315 SITE PLAN AND GENERAL NOTES 230KV SWITCHYARDi,TALBOT HILL SUBSTATION c8i (NEER gvcsji •VEB1:11 11115 1’UoJ I 04 B0V IPhp*IC)-Ph.C) t\7*r_,_,’•;i;iT-...b*z(DC)b:I!-:[1:IiI%_,.r—II%%.,;:N:---E**tJiq,‘v’-:-t;/H/.*-1’I,,,s‘:Ir,!•_______%\‘:/7Lc‘I%%%1:*w(;j)_sttU000C/)0-J0-J>0LiLiLiH-0C)0LiH-:DC0H-U)0zC0DCLiH-:DC0H-(In0->C)LiDCLiLiDCLi>H-0Li-JLiU)U-0LiDCIsensni•$]1vJ$ F--.aMIIII..ILZdOHdYIVGNOdNOIJN3J30L“•‘“_)]IvaI:NOI±V±SBflS11IH±O1V±INV1dDNI±NV1dlVflSAONI±NV1UThddV9JVflSIAXIasDNI±NV1d1NOdAdDSGNV I I COMMON BOTANICA&Z % NAME NAME WEIGHT PURITh’GERMINATION TALL OR MEADOW SCHEDONORUS 75—80%98%90%FESCUE PRATENSIS SEASIDE AGROSTIS 10—15%92%85%BENTGRASS PALUSTRIS REOTOP AGROSTISBENTGRASSGIGANTEA 98%90% SEED MIX I 23266 TOTAL SOFT EMERGENT PLANTING 7000TOTALSQFT S • CAREX ORNIPTA SLOUGH SEDGE I—YR TRANSPLANT I FT o.c.3,OTI 38/Ti OETCHAMPSIA CESPITOSA lIFTED HAIRORASS I—YR TRANSPLANT I FT S.C.2,151 26%\J_/SCIRPUS CYPEGNUS ROSY 505CC I—YR TRANSPLANT I FT SC.2,829 35% ‘%Ji_ TI22ACER CACINATUM VINE MAPLE 6 TALLc÷MORELLACERIFERAAAAMYRTLESSAL ,—-GARRYA ELLIPTICA SILK TASSEL S GAL :::_)_VF AAAUTUS REDO STRARBERRY TREE S GAL 4.378 TOTAL SOFT 6FTO.C.II IS 6 FT O.C.IS 5% 6 FT S.C.AK 3% 6FTS.C.30 25% NATIVE SHRUBS PLANTING DETAIL NOT TO SCALE ADO 3 COMPOST PER PROJECT AMENDED EMERGENT PLANTING TYPICAL LAYOUT ••,;•..::• SOIL AMENDMENT DETAIL VISUAL BARRIER _____ NOT TO SCALE RANT CENTER DECIDUOUS TREE PLANTING DETAIL TRIANGULAR SPACING DIAGRAM NOT TO SCALE NOT TO SCALE A— Pl STEP2 STEP 4 NOT TO SCALE ONE YEAR TRANSPLANT PLANTING STEPS STEP6 STEP7 ST8 VISUAL BARRIER PLANTING TYPICAL LAYOUT L;;ffr . VISUAL BARRIER PLANTING PLAN TALBOT HILL SUBSTATION I I SATE fM/D/YI 8.10FF SUBSTATION D6ADNO NO BOA DO .L.L .LL ‘‘.0 IREVOKED I ::::L056 DO:$$DO$I SL6D5:STE €TAL \\\ /,,/ 4W4.oo/J \-y /X :N-/,,/ V’ /8SH LEGEND GRAVEL ACCESS ROAD ASPHALT 1—,0OE45 CALL BE’t1;Li YOUDIG IrCaII:IOj FREE I-800-424-5555] DITCH 1/ \ !DrSi1EPSJ L NATIVE COMPACTED N”BASE COURSE SECTION GRAPHIC SCALE 32C4O8o GRAPH IC SCALE LEGEND —444 —PROPOSED CUNrotj Jill GRAVEL. ——OVERHEAD POWER LINES ,—*STREET LIGHT ENTRAMrF SECTJDN f115KV SIDE)%’ I r I :zi \J c , * REFERENCE DRAWINGS 1—CALL B’1ii;i YOUDIG I Call:TOLL FREE I L_____1 —800—424—5555J // / ,,y• ,// )\//‘7i:jI../ [—,———‘—- 634’—o’t . c,\“ii -1 &OUDE _---------t ---—— WGON 1 —I HE DE “——fl\i l___a ,_—“‘-—-‘-—‘a I I £:‘‘::L15’::‘“/•,,“‘ •‘:‘P” I t 1 ‘1 ]-J “‘J ‘‘J -J ‘‘-‘c ,:I a I IIl ‘!I --========‘: .E LJ _____:‘ I(,/ ,---‘---‘,---‘C---’,t [,‘,/\1’ ......[,h 1L1 I LLHLHt : 1 MATCH .-.::l : .-.-:L .. LINE.(23OKV SIDE )6’\i •.::::-.....:..al:-: :Q5.:.:::---::::::--.-::-::-:-:-:-.-: ...--.-:-.-:-.-:::::.:-::-.,:::-:::.:-.lfl .- LEGEND: —444— sPcc CUR8 AREA-’ -i1 _;I U GRADING NOTES C APPROX I MATE EARTHWORK iiRI’1 I I I NOTES GRAPHIC SCALE :--:--::---‘:::::::::: 4W/BAR5EDW[RE.Typ(_16381 I BECONSTRUCTED IN SAME PLACE j LEGEND: spoi ELEVATION L:z.. 1zøAAQo5 CALL YOUDIG I Call:TOLL FREFIL_1—800—424—5555] ,-,ttT5 GRADING AND FENCING PLAN 115KV SWITCHYARD ____________________ TALBOT HILL SUBSTATION ________ !FEDF7E*T ON 1 aw— T1lSoVso!roVTooo1 L_ P CORN AREA1 LEVA 0 L ::a:o 1<) NOTE: REFERENCE DRAWINGS INTALL4”O€NEWYARO I I GRAPHIC SCALE 1O _________________________________ i ZI0C)LU2CL2..U)-LUF--C0.zC>-I—ar)I—LU—r—I01—<‘—I01—L/w,z0_J—_JI——C)=LU(MI—00z-J-<20I—•<cC01(ci:>-LU>02-JCLU>H<Ca0V‘-c’.J-J-LU0zCC)CzC4C,ci->-x1DD1,DD(\JLUCIssns.:svas GeotechnicalEngineeringServicesReportTalbotSubstationImprovementsRenton,WashingtonPugetSoundEnergyDecember5,2016 FYEXHIBIT7EntireDocumentAvailableUponRequestTechnicalInformationReportTalbotSubstationStormwaterSupportPugetSoundEnergyRenton,WashingtonNovember16,2016 EXHIBIT8PSETalbotHillSubstationEntireDocumentArboristReportAvailableUpon—To:JeffMcMeeldn,PSERequestz-JFrom:TomEarly,OtakInc.11241v’i/lowsrottdiiesuite200Date:December13,2016red71YOid,wa98052phone(425)8224446ProjectNo.:319$3.hAssignmentThearboristreportisrequiredtoaccompanyaRentonSitePlanReviewsubmittal.Itisdevelopedtoconveyspecificinformationregardingthetreesproposedforremoval,treeprotectionfortreestoberetainedandsupplementaltreeplantingsuggestions.Iamcoordinatingtheintegrationoftreeremoval,treeretentionandtreeprotectionintothelandscapeplansofthestormwaterpond.AssessmentMethodsTheinventoryoftreessperformedonOctober13,2016.Theinventoryistabulatedinthetreetablewhichincludesanassignmentoftreenumber,identificationoftreespeciesbycommonandbotanicalnames,diameteratbreastheight(DBH)measurement,aconditionassessmentusingfivecategories(Excellent,Good,Fair,PoorandDead)basedonvisualtreeinspectionofeachtree,commentsspecifictoeachtreesconditionandtheproposaltoeitherremoveorretainthetree.InthecaseoftreesMthmultiplestems,typicallybeakedhazelnuttreesinthiscase,I’venotedtheapproximatenumberofstemsandthestemsaveragesize.SitedescriptionThesiteaddressis3004BeaconWaySouth.ThelocationofthesubjecttreesisalongthesouthsideandsoutheastcornerofthePSETalbotIlifiSubstation.Thelandsurfaceisundulatingwithvegetationtypicalofuplandplantspecies.Seefigure1.Themajorityofthetreesareingoodshapewiththeexceptionofthewillowandalder;theyhavebeendamagedbyrecentbranchfailuresduringthespringvndstorms.K:\proj\319OO\31983H\ProjDocs\Reports\Ta1botHillArboristReport.doc ConstructionMitigationDescriptionforPSETalbotHillSubstationProposedconstructiondates:Thisprojectistobeconstructedintwophases.PhaseoneincludesthecivilportionsofthejobandisproposedforApril2017toOctober2017.PhasetwoincludesassemblyoftheelectricalequipmentandisproposedforApril2018toOctober2018.Hoursanddaysofoperation:HoursanddaysofoperationaretofollowCityofRentonnormalworkinghours7:00a.m.-10:00p.m.MondaythroughFriday,and9:00a.m.-10:00p.m.SaturdayandSunday.Proposedhaulingandtransportationroutes:TheproposedhaulroutewouldbeviaPugetDriveandBensonRoad.Measurestobeimplementedtominimizedust,traffic,mud,noise,etc.:ATESCplanwillbedevelopedandimplementedduringconstruction.Dustandmudshouldnotenterthepublicroadrightofway.Ifdebristrack-outoccurs,immediatecorrectionswillbeimplemented.Anyspecialhoursproposed:Therearenospecialhoursproposedatthistime.Preliminarytrafficcontrolplan:Seeattachedtrafficcontrolplan.EXHIBIT9 ADVISORYNOTESTOAPPLICANTLUAI6-000922—--—-—--RentonApplicationDate:December06,2016SiteAddress:2400SPugetDrName:TalbotHillSubstationImprovementsRenton,WA98055-4311PLAN-PlanningReview-LandUseVersion1BuildingReview-PlanningCommentsContact:CraigBurnellI425-430-7290Icburnell@rentonwa.govRecommendations:ProjectwillbereviewedforcompliancewithBuildingCodes.Thecurrentadoptedbuildingcodeis2015InternationalBuildingCode.Recommendationsofthegeotechnicalreportmustbefollowedasaconditionofbuildingpermits.Geotechnicalreportshouldbeupdatedto2015IBCdesignparameters.EngineeringReviewCommentsContact:AnnFowler425-430-7382afowler@rentonwa.govRecommendations:IhavereviewedtheapplicationfortheTalbotHillSubstationat2400SPugetDrive(APN(’s)2023059003,9066,9064)andhavethefollowingcomments:EXISTINGCONDITIONSThetotalsiteisapproximately50.4acresacresinsizeandisirregularinshape.Thesiteincludesanexistingsubstationwithaccessgraveldriveways.Thesubstationcoversapproximately7.75acresofthetotalsitearea.WaterNowaterserviceisproposedorrequitedfortheredevelopmentproject.EXHIBIT10SewerNosewerserviceisproposedorrequiredfortheredevelopmentproject.StormRunofffromthesitesheetflowsoutwardfromthemiddleofthesubstation.Thereareexistingdrainagepipesonthenortheastandsoutheastsideofthesubstationwhichatetiedtocatchbasinswithinthefenceline.Therimsofthecatchbasinsarecurrentlyatanelevationhigherthanthesurroundingground,whichpreventsthemfromcapturingstormwater.Gradedifferencesbetweenthesubstationslabandthesurroundinggroundsurfacealongthenorthandnortheastsidesofthesubstationpreventsstormwaterfromdrainingawayfromthesubstationandtendstopondwithinthesubstationfootprint.RunoffalongthesouthernedgeofthesubstationflowsintoaculvertlocatedbeneaththeaccesstoadwhichultimatelyflowseasttowardsGrantAvenueSouth.StreetsThesiteisborderedbyBeaconWaySouthtothenortheast.BeaconWaySouthisclassifiedasaResidentialAccessRoadandislocatedwithintheCityofSeattleCedarRivetPipelineEasement.ThesiteisborderedbyPugetDriveSoutheasttothesouth.PugetDriveSoutheastisclassifiedasaMinorArterialStreet.ExistingrightofwayinPugetDriveSoutheastisapproximately100feetasmeasuredusingtheKingCountyAssessor’sMap.TherearenoexistingfrontageimprovementsalongPugetDriveSoutheast.CODEREQUIREMENTSSURFACEWATERI.Ageotechnicalreport,datedDecember5,2016,completedbyGeoEngineers,Inc.forthesitehasbeenprovided.Theprojectsitecontainsmoderatecoalminehazards,moderatelandslidehazardsandsensitiveslopes(within50feet).Erosioncontrolmeasureswillneedtobeinplacepriortostartinggradingactivitiesonthesite.Thereportdiscussesthesoilandgroundwatercharacteristicsofthesiteincludinginfiltrationpotentialandprovidesrecommendationsforprojectdesignandconstruction.Thereportdiscountstheuseofinfiltrationforthesiteduetothedepthoftheoutwashsoilscomparedtotheexistingsurfaceelevationspresentonthesite.Geotechnicalrecommendationspresentedneedtobeaddresswithintheprojectplans.2.APreliminaryDrainagePlanandTechnicalInformationReport(TIR),datedNovember16,2016,wassubmittedbyHDREngineering,Inc.withtheLandUseApplication.BasedontheCityofRenton’sflowcontrolmap,thesitefallswithintheFlowControlDurationStandardareamatchingForestedSiteConditionsandiswithintheLowerCedarRiverandBlackRiverDrainageBasin.ThedevelopmentissubjecttoFullDrainageReviewinaccordancewiththe2009KingCountySurfaceWaterDesignManual(KCSWDM)andthe2010CityofRentonAmendmentstotheKCSWDM.AllcorerequirementsandthesixspecialrequirementsarediscussedintheTechnicalInformationReport.ThefollowingstormwaterimprovementsarerequiredandshallbediscussedwithintheTIR:a.TheapplicantsubmittedacompleteConditionUsePermitApplicationonDecember6,2016andisthereforevestedtothe2009KCSWDMandthe2010CityofRentonAmendmentstotheKCSWDMforaperiodof180daysfromtheapplicationdate.ThevestingperiodwillexpireonJune4,2017inaccordancewithRMC41045E.2.b.AcompleteConstructionPermitApplicationmustbereceivedpriortotheexpirationdateofthevestingperiod.Otherwise,theapplicantwillberequiredtocomplywiththestormwatermanualthatisineffectatthetimeofconstructionpermitapplication.b.AppropriateflowcontrolBMPswillberequiredtohelpmitigatethenewrunoffcreatedbythisdevelopmentsincethenewplusreplacedimperviousareaisover2,000squarefeet.Apreliminarydrainageplan,includingtheapplicationofflowcontrolBMPs,shallbeincludedwiththelanduseapplication,asapplicabletotheproject.C.Asnotedinthereport,theapplicantisexemptfromwaterqualitysincethenewplusreplacedpollutiongeneratingimpervioussurface(PGIS)areaislessthan5,000squarefeet.Anychangestotheredevelopmentprojectwhichresultsingreaterthan5,000squarefeetofPGISarea,asdefinedbythe2009KCSWDM,maytriggerwaterqualityfacilitiestobeprovided.3.TheapplicanthasproposedinstallationofanewstormwaterconveyancesysteminsidethesubstationwhichwillrouteflowstoanewRan:January19,2017Page1of2 ADVISORYNOTESTOAPPLICANTLUAI6-000922--------—-RentonPLAN-PlanningReview-LandUseVersion1EngineeringReviewCommentsContact:AnnFowlerI425-430-73821afowIerrentonwa.govdetentionpondtobelocatedatthesoundendofthesubstationbetweenthesubstationandtheaccessroadinordertomitigatetheaddedimpervioussurfaceareaoftheredevelopmentproject.4.Allworkproposedoutsideoftheapplicant’spropertywillrequireapermanentdrainageeasementtobeprovidedtotheCityandatemporaryconstructioneasementpriortoanypermitsbeingissued.5.AConstructionStormwaterGeneralPermitfromDepartmentofEcologyisrequiredsincegradingandclearingofthesiteexceedsoneacre.AStormwaterPollutionPreventionPlan(SWPPP)isrequiredforthissite.6.Surfacewatersystemdevelopmentfeeis$0641persquarefootofnewimpervioussurface,butnotlessthan$1608.00.Thisispayablepriortoissuanceoftheconstructionpermit.TRANSPORTATIONI.PerCitycode46060,requiredhalfstreetfrontageimprovementsshallinclude54ftofpavedroadwaywidth(27ftfromcenterline),installationofa0.5footcurb,an8footplantingstrip,an8footsidewalk,streettreesandstormdrainageimprovements.Norightofwaydedicationisrequired.2.RefertoCitycode44080regardingdrivewayregulations.DrivewaysshallbedesignedinaccordancewithCitystandardplans104.1and104.2.a.Themaximumwidthofanydrivewayshallnotexceed30feetattherightofwayline.b.Drivewaysshallbelocatedaminimumof5feetfrompropertylines.C.Maximumdrivewayslopeis8%.3.PavingandtrenchrestorationshallcomplywiththeCity’sTrenchRestorationandOverlayRequirementsforanyworkwithintheCityrightofway.GENERALCOMMENTSI.Whenutilityplansarecomplete,pleasesubmitfour(4)copiesofthedrawings,two(2)copiesofthedrainagereport,one(1)completeelectronicsubmittal(drawingsanddrainagereport),thepermitapplication,anitemizedcostofconstructionestimate,andapplicationfeeatthecounteronthesixthfloor.PleasevisittheDevelopmentEngineeringFormspageforthemostuptodateplansubmittalrequirements:http://rentonwa.gov/business/default.aspx?id=424732.Adequateseparationbetweenutilitiesaswellasotherfeaturesshallbeprovidedinaccordancewithcoderequirements.3.Allconstructionutilitypermitsforutilityandstreetimprovementswillrequireseparateplansubmittals.AllutilityplansshallconfirmtotheRentonDraftingStandards.AlicensedCivilEngineershallpreparethecivilplans.4.Afinalsurveythatisstampedandsignedbytheprofessionallandsurveyorofrecordwillneedtobeprovided.Allexistingutilitiesneedtobesurveyedandshown.PleasereferenceCORMapsformappingandrecordsofexistingutilitiesintheprojectvicinity.5.Alandscapingplanshallbeincludedwiththecivilplansubmittal.Eachplanshallbeonseparatesheets.6.Allutilitylines(i.e.electrical,phone,andcableservices,etc.)servingtheproposeddevelopmentmustbeunderground.TheconstructionofthesefranchiseutilitiesmustbeinspectedandapprovedbyaCityofRentoninspector.7.Feesquotedinthisdocumentreflectthefeesapplicableintheyear2017onlyandwillbeassessedbasedonthefeethatiscurrentatthetimeofthepermitapplicationorissuance,asapplicabletothepermittype.Pleasevisitwww.rentonwa.govforthecurrentdevelopmentfeeschedule.Ran:January19,2017Page2of2