Post on 28-Dec-2021
STATE OF CALIFORNIA
PUBLIC UTILITIES COMMISSION Edmund G. Brown Jr., Governor
505 VAN NESS AVENUE SAN FRANCISCO, CA 94102-3298
May 22, 2015 Susan Nelson, Project Manager Regulatory Affairs Department Southern California Edison 8631 Rush Street, General Office 4 – G10Q (Ground Floor) Rosemead, CA 91770 Re: Data Request No. 1 for the Mesa 500-kV Substation Project (CPUC Proceeding A. 15-03-003) Ms. Nelson: Upon further review of Southern California Edison’s Proponent’s Environmental Assessment (PEA) for the Mesa 500-kV Substation Project, the Energy Division requests the information contained in Attachments 1 and 2 to this letter. We request that the responses to this item be provided to us within 14 days. The Energy Division reserves the right to request additional information at any point in the process. Questions relating to the Mesa 500-kV Substation Project should be directed to me at (415) 703-1966 or lisa.orsaba@cpuc.ca.gov. Sincerely,
MJ Orsaba
Lisa Orsaba, California Public Utilities Commission Energy Division CC: Mary Jo Borak, CPUC Infrastructure Permitting and CEQA
Molly Sterkel, CPUC Infrastructure Planning and Permitting Nicolas Sher, CPUC Legal Division
Rachel James, Ecology and Environment, Inc. Attachment 1: Data Request #1 Attachment 2: Mesa Traffic Study Outline
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
1 PEA,2.0PurposeandNeed
PowerFlowData ProvidethePowerFlowData.
2 PEA,3.0ProjectDescription,Section3.4,Page3‐2
ModificationstoExistingSubstations
Provideadetailedexplanationoftheactivitiesthatwouldbeinvolvedduringtheproposed220‐kVterminationequipmentreplacementatLagunaBellandLightpipeSubstations.Clarifyiftheproposedequipmentreplacementactivitieswouldrequireadditionaltruckandvehicletripsandtheiranticipatedduration.Inaddition,describethetypeofdisturbancethatwouldbeassociatedwiththeproposedupgradestoprotectionrelaysand/ortelecommunicationequipmentsatothersatellitesubstations.
3 PEA,3.0ProjectDescription,Section3.4,Page3‐2
ModificationstoExistingSubstations
Providetheestimatedduration,materialexcavationimport/exportquantities,andvehicleandtrucktripsrequiredfortheproposedrerouteofexistingtelecommunicationroutesinsidetheperimeterofVincent,Pardee,andWalnutSubstations.Attachment3‐BofthePEAalsomentionstheinstallationofnewconduitstoadjacenttransmissiontowerstoprovidediversefiberopticroutesintotheGoodrichSubstation.ClarifyifthisadditionalsubstationispartoftheproposedreroutesoftelecommunicationlinesinsideexistingsubstationslistedinPage3‐22ofthePEA.
4 PEA,3.0ProjectDescription,Section3.5,Page3‐2
ConversionofStreetLightSourceLine
ProvidetheestimateddurationandadetaileddescriptionoftheactivitiesandstructuresrequiredintheproposedconversionoftheexistingstreetlightsourcelineintheCityofBellGardens.
5 PEA,3.0ProjectDescription,Section3.7
HelicopterUse Page3‐84indicatesthathelicopters"mayusethepotentialstagingyardlocations,asneeded."IntheeventthestagingyardlocationsdescribedinTable3‐7cannotoptimizeflighttimetostructurelocations,clarifyifadditionalhelicopterstagingyardswouldbeused.Ifadditionalhelicopterstagingareaswouldberequired,provideapproximatesizeofsuchareas.
Submitted May 22, 2015 Page 1 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
6 PEA,3.0ProjectDescription,Section3.4,Page3‐6
OperationandMaintenance Section3.4ofthePEAindicatesthattheproposedMesa500‐kVSubstationwouldbestaffed;however,Section3.8onlyrefersto"SwitchingCenterPersonnel,""SubstationOperationsSupervisor,""SystemOperator,"and"MaintenancePersonnel."ProvideaspecificnumberofpermanentstaffthatwouldbeworkingworkingattheproposedMesa500‐kVSubstation.
7 PEA,3.0ProjectDescription,Section3.7
RemovalofExistingStructures
Pages3‐91and3‐92ofthePEAmentionthepotentialuseofimportedfilltobackfilltheholesleftfromremovingtemporaryshoo‐flystructuresandwoodpoles.Providetheestimatedvolumethatwouldbeimportedandpotentialsourceforthismaterial.
8 PEA,3.0ProjectDescription,Section3.7
TrenchlessTechniques Page3‐100ofthePEAindicatesthatalternativetrenchlessmethodswouldbeusedtoinstallundergroundconduitswhereopen‐cuttrenchingmaynotbepermitted,fesible,orpreferred.Providetheanticipatedjack‐and‐boreandHDDlocationsfortheproposedproject.
9 PEA,3.0ProjectDescription,Section3.7,P.3‐102
HorizontalDirectionalDrilling
Provideacopyoftheproposed'frac‐out'contingencyplantobeusedduringHDDoperations.ClarifywhethertheproposedHDDoperationswouldhaveadrillingmudspillpreventionandcontrolplaninplace.
10 PEA,3.0ProjectDescription,Section3.5,P.3‐4
WoodPoleRemoval Provideestimateddateortimeframewhenthewind‐loadtestingandfinalnumberofwoodpolestoberemovedwouldbeavailable.
11 PEA,3.0ProjectDescription,Section3.7
WasteManagement Providetheestimatedquantityofsolidwastethatwouldbegeneratedbytheproposedprojecttobedisposedofatapprovedlandfills.Clarifyiftheoff‐sitedisposalfacilitieslistedinTable3‐10wouldbeusedforallproposedprojectconstructionactivities.
12 PEA,3.0ProjectDescription,Section3.4
SubstationEquipment/GreenhouseGas
ClarifyifalltheproposedMesaSubstationequipmentwouldbe100%airinsulated.Intheeventthattheproposedsubstationwouldusegas‐insulatedequiment,providetheestimatedvolumeofSF6tobestoredattheMesaSubstationsiteandtheanticipatedleakratefromgas‐insulatedequipmentduringoperations.
Submitted May 22, 2015 Page 2 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
13 PEA,3.0ProjectDescriptionand4.16Traffic,3.7.1.1/4.16.1.1
ConstructionRoutesandStagingAreas
Confirmthattheexistingroadwaynetworkdefinedin4.16.1.1includesaccesstothestagingareasdefinedin3.7.1.1.Ifnot,definetheprobableroutesthatwillbeusedforaccesstothestagingareasandmaterialdeliveryfromthestagingareastotheconstructionsites.
14 PEA,3.0ProjectDescription,Table3‐7
StagingYards Table3‐7identifiesfourstagingyardsfortheproposedproject.Confirmthesizeandlocationofanyadditionalstagingorlaydownyardswouldbeneededfortheproposedproject.PleaseprovideGISdataforanyadditionallocationsidentifiedthatwerenotincludedintheoriginalGISdatarequest.
15 PEA,4.1Aesthetics,p.4.1‐24
NewTelecommunicationsLinesandPoles
Thedocumentstates:"Thenewtelecommunicationslineswouldbeinstalledoverheadandinexistingandnewundergroundconduitsandwouldutilizeexistingmanholesandutilitypoles.Wherenecessary,upto46utilitypolesalongtheserouteswouldbereplaced."Explainwhetherthereplacementpoleswouldbethesametypeandheight.Iftheywillbedifferent,describethedesignandheightsofthenewpolescomparedtotheexistingpolestheywouldreplace.
16 PEA,4.1Aesthetics,p.4.1‐24‐4.1‐39
MapofPhotoLocationsforTelecommunicationLines
Provideamapormapsshowingthelocationsanddirectionsofviewsofphotographs15through24.
17 PEA,4.1Aesthetics,p.4.1‐40‐4.1‐41
PotentiallyAffectedViewerGroups
Providesourcesforthedeterminationsofsensitivityforthefivepotentiallyaffectedviewergroups.Inaddition,providetheviewersensitivitylevelforthesixthgroupoffutureviewersfortheplannedretailshoppingcenter.
18 PEA,4.1Aesthetics,p.4.1‐64,footnote2
ColoringofLSTs Thedocumentstatesinfootnote2:"ColoringofLSTelementspriortoassemblywillhamperorimpedethiscontinuouselectricpathbecauseitcreatesaninsulatorbetweentheelements.ColorapplicationtoLSTstructureswouldneedtobeappliedfollowingassemblyoftheindividualpieces."Clarifyifthisstatementappliestothepre‐assemblyapplicationofcommerciallyavailabledarkeningstainsforgalvanizedsteelforLSTs.
Submitted May 22, 2015 Page 3 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
19 PEA,4.1Aesthetics,p.4.1‐65
VegetationRemovalandPlantingAreas
Thedocumentstates:"TheProposedProjectwouldrequireremovalofsomematurevegetationandwouldalsoincludeinstallationofnewstreettreesatthesitefrontagealongPotreroGrandeDrive."Provideaplanofthesiteindicatingthelocationsofmaturevegetationtoberemovedandaconceptplanshowingareaswherenewstreettreesandothervegetationwouldbeplanted.Identifytheapproximateheight(s)orheightrangesofareasofmaturetreesthatwillberemoved.
20 PEA,4.1Aesthetics,p.4.1‐65‐4.1‐71
RelativeHeightsofExistingandNewStructures
IntheassessmentofimpactsforviewswithvisualsimulationsforKOPs1through13,anumberofreferencesaremadetoneworreplacementstructuresbeingrelatively(i.e.,"somewhat")shorterortallerthanexistingstructures.Wherethesereferencesoccur,identifytheheightsoftheexistingandnewstructuresortherelativeheightdifferences(e.g.,"threeLSTsandoneTSPreplacefiveexistingtowersthatrangebetween10and20feetshorterthanthereplacementstructures"or"thethreenewLSTswillbeapproximately20feettallerthanthefiveexistingLSTstheyarereplacing").InadditiontoheightsofLSTsandTSPs,provideapproximateorrelativeheightsoftheothermajorelementsdiscussed,includingtheswitchracks,transformerracks,operationsbuilding,testandmaintenancebuilding,andperimeterwall.
21 PEA,4.4Biology AgencyContacts ProvidethenamesandcontactinformationfortherepresenativesthatSCEconsultedwithatvariousgovernmentagencies(e.g.wildlifeagenciesandcountyandcityrepresentatives).
22 PEA,4.4Biology ConsultationwithUSACEandRWQCB
ProvideanupdateonthestatusofconsultationwiththeU.S.ArmyCorpsofEngineersregardinganyrequestforanApprovedJurisdictionalDetermination.Inaddition,provideanupdateonthestatusofconsultationwiththeCaliforniaRegionalWaterQualityControlBoardregardingjurisdictionalWatersoftheState.ThisinformationisneededtoevaluatepotentialimpactstoWatersoftheU.SandWatersoftheState.
Submitted May 22, 2015 Page 4 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
23 PEA,4.6Geology Geo/Soils/MinResourcesReferences
ElectroniccopiesofthereferencescitedintheGeology&SoilsandMineralResourcessectionsofthePEAareneededtoverifyinformationprovidedinthePEAanddeterminewhetheradditionaldataareneeded.
24 PEA,4.8HazardsandHazardousMaterials
HazardousSubstancesOnSite
ProvidealistofhazardoussubstancescurrentlybeingstoredorusedattheMesaSubstationsite,whichwouldneedtobehandled,transported,ordisposedofaspartofthedecommissioningoftheexistingsubstation.
25 PEA,4.16Traffic,Sec.4.16.4
RoadwayRepair Describemeasurestoensureanydamagedonetoarearoadways,includingbicyclelanes,resultingfromconstructionworkwouldberepairedfollowingcompletionofprojectconstruction.
26 PEA,4.16Traffic TrafficStudy Duetothehighvolumeoftrafficduringconstruction,aTrafficStudyisrequiredtosupporttheconclusionsintheimpactanalysis.ProvideaTrafficStudybasedonthe"ProposedTrafficStudyOutline"providedasAttachment#2tothisDataRequest(DataRequest#1).TheTrafficStudyshouldbebasedontheproposedoutlinebutisnotlimitedtothedatarequestedintheoutline,shouldadditionalinformationbenecessarytosupporttheconclusionsintheTrafficStudy.TheTrafficStudymustbeoverseenorpreparedapprovedbyaTrafficEngineerpriortosubmittaltotheCPUC.
27 PEA,4.18Cumulative
CumulativeProject‐‐2015MesaSubstation66‐kVCapacitor
Provideadditionaldetailsastowhattheprojectentailsandwhenconstructionoftheprojectisanticipated.
28 PEA,4.18Cumulative
CumulativeProject‐‐NewMesaSubstationDistributionSubstationPlanCircuit
Provideadditionaldetailsastowhattheprojectentailsandwhenconstructionoftheprojectisanticipatedtostartandend.
29 PEA,4.18Cumulative
CumulativeProject‐‐HardingSubstationElimination
Provideanupdatedscheduleofwhendemolitionisanticipatedtooccurandwhenitisexpectedtobecomplete.
Submitted May 22, 2015 Page 5 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
30 PEA,4.18Cumulative
CumulativeProject‐‐Mesa‐LagunaBellNarrows66‐kVReconductoring
Provideanupdatedscheduleofwhenreconductoringisanticipatedtooccurandwhenitisexpectedtobecomplete.
31 PEA,4.18Cumulative
CumulativeProject‐‐DistributionCircuitatWalnutGroveAvenueandLandisLane
Provideadditionaldetailsastowhattheprojectentailsandwhenconstructionoftheprojectisanticipatedtostartandend.
32 PEA,4.18Cumulative
CumulativeProject‐‐DistributionCircuitatParamountBoulevardandElbaStreet
Provideadditionaldetailsastowhattheprojectentailsandwhenconstructionoftheprojectisanticipatedtostartandend.
33 PEA,4.18Cumulative
CumulativeProject‐‐TehachapiRenewableTransmissionProject
ProvideadditionaldetailsastowhetherportionsofTRTPnearMesaSubstationwillbecompleteand,iftheyarenot,whentheywillbecompleted.ProvidedetailsaboutTRTPactivitiesoccurringnear(i.e.,within1mile)oftheMesaSubstationoranyotherprojectcomponents.
34 PEA,4.18Cumulative
CumulativeProject‐‐Mesa‐RushNo.3LineSubtransmissionReconductoring
Provideadditionaldetailsastowhattheprojectentails,theprojectalignment,andwhenconstructionoftheprojectisanticipatedtostartandend.
35 PEA,5.0Alternatives
NoProjectAlternative IftheMesaSubstationProjectisnotapproved,wouldTRTPbeconnectedtotheMesaSubstation(i.e.,wouldthesubstationbeupgraded)aspartoftheNoProjectAlternative?WhatupgradeswouldberequiredundertheNoProjectAlternativetoconnectthe500‐kVline?
36 PEA,AppendixWaterStudy
WaterStudy Thewaterstudyspecifiesthegeneralwaterusefortheproject.Providedetailsforthewateruseduringbothconstructionandoperationsothattheirseparateimpactscanbedetermined.
Submitted May 22, 2015 Page 6 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
37 DeficiencyResponsePD‐01
EquipmentRemoval Phase1wouldinvolvetheremovalof"someequipmentstoredonsite."Clarifythetypeandquantityoftheequipmentthatwouldberemovedandtheintendeduseofthisremovedequipment(i.e.,ifreused,recycled,ordisposedofatanoff‐sitelocation).
38 DeficiencyResponsePD‐01
LandDisturbanceperPhase ProvidetheanticipatedlanddisturbanceperconstructionphasewithintheMesaSubstationsite.
39 DeficiencyResponsePD‐01
Stockpile ProvidethepotentiallocationoftheStockpileforPhase3indicatedinTable1andtheproposedmeasurestocontrolfugitivedustfromthisstockpileduringPhase2ofconstruction.
40 DeficiencyResponsePD‐01
StructurestobeConstructedperPhase
ProvidetheanticipatednumberofoverheadandundergroundstructuresthatwouldbeinstalledwithintheMesaSubstationsiteduringeachphaseofconstruction.
41 DeficiencyResponsePD‐01
RetainingWalls Providelocationsandassociatedtemporarydisturbanceareasfortheretainingwallsthatwouldbeconstructedordemolishedduringtheproposedsubstationconstructionphases.
42 DeficiencyResponseNOI‐01
ConstructionNoiseExposure DeficiencyResponseNOI‐01documentschangesintheanticipatednoiseforspecificactivitiesintheworstcasescenario(Phase1,4thquarterof2016)toevaluateconstructionnoise.ThewesternboundaryoftheproposedPhase1area(asdepictedinResponsetoDeficiencyQuestionPD‐01)wouldbeadjacenttotheBestWesternMarklandHotel(locatedat434PotreroGrandeDrive,MontereyPark,CA).Althoughhotelsarenotcommonlydefinedassensitivereceptors,workersandguestsatthishotelcouldbeexposedtonoiseandairemissionsinexcessofambientlevelsduringdaytimehours.ProvidetheestimateddurationandscopeofactivitiesproposedinthewesternboundaryofthePhase1constructionareaadjacenttotheBestWesternMarklandHotel.Inaddition,providetheanticipateddistancefromthesubstationsiteboundarywheremostoftheproposedPhase1constructionwouldoccur.
Submitted May 22, 2015 Page 7 of 8
SCE Mesa 500‐kV Substation Project CPUC Data Request #1
Item # Reference/ Page #
Title Request
43 DeficiencyResponseAIR‐01
SensitiveReceptors TheupdatedLocalizedSignificanceThreshold(LST)analysisresultsassumepresenceofreceptorslocatedatadistanceof280feetfromtheMesaSubstationsiteand100feetfromthetransmissionandsubtransmission.Justifytheseassumptionsandprovidethelocationofthesereceptors.
Submitted May 22, 2015 Page 8 of 8
Mesa500‐kVSubstationProjectProposedTrafficStudyOutline
1: ExecutiveSummary Brief Project Overview
Short Discussion of Project Traffic Generation Potential
Expected Project Impacts
Summary of Mitigation Measures
2: Introduction Detailed Study Methodology
Regional Map
General Overview of Project Site and Study Area Boundary
o Site Layout Map
o Existing Roadways and Intersections in the Study Area
o Construction Routes
3: AreaDevelopment Description of Existing Land Uses Near Project Site
Description of Proposed Land Uses Near Project Site
4: ExistingStreetSystem(Baseline/2015)o Roadways Used for Project Activities (Anticipated impacted roadways included below;
Transportation Engineer to verify)
Study Area Intersections
East Markland Drive and Potrero Grande Drive
Greenwood Avenue and Potrero Grande Drive
Potrero Grande Drive and Hill Drive
San Gabriel Boulevard and Paramount Boulevard
Study Area Links
Potrero Grande Drive (between East Markland Drive and Greenwood
Avenue) (to capture impacts from substation driveway use)
Study Area Ramps
SR 60 (west) off‐ramp at East Markland Drive
SR 60 (west and east) off‐ramp at Paramount Boulevard
o Roadway Classification (per Monterey Park)
o Peak Hour Traffic Count
Traffic counts can be derived from the Monterey Park Marketplace 2015 Traffic
Impact Assessment (without project) projections if such projections reflect
actual conditions (i.e., actual growth since 2010 and projects constructed
nearby since 2010). If they do not reflect actual conditions, revise 2015 numbers
to reflect actual conditions and provide the methodology for the revision.
o Daily Traffic Volumes
Traffic counts for 2015 can be derived from the Monterey Park Marketplace
2015 Traffic Impact Assessment (without project) projections if such projections
reflect actual conditions (i.e., actual growth since 2010 and projects constructed
nearby since 2010). If they do not reflect actual conditions, revise 2015 numbers
to reflect actual conditions and provide the methodology for the revision.
Existing SCE Traffic Volumes to the proposed substation site
5: TrafficGenerationForecast Projected Trip Generation Based on Construction Activity Data
o AM peak, by construction phase
o PM peak, by construction phase
o Daily, by construction phase
Mitigation Measures, if proposed
o Projected reduction in trips at AM peak, PM peak, and daily
6: TrafficDistributionandAssignment Utilization of Roadways by Project Traffic
Projected Daily Link Volumes
o For three phases of project, using worst‐case scenario
Morning and Afternoon Peak Hour Turning Movement Volumes
o For three phases of project, using worst‐case scenario
Projected Freeway Ramp Volumes
o For three phases of project, using worst‐case scenario
7: TrafficImpactStudy/ProjectImpacts Study Area
o Selected intersections , links, on‐ and off‐ramps as listed in section 4
Intersection Analysis (using ICU procedure)
o Forecasted LOS for studied intersections during three phases of project, using worst‐
case scenario (project plus baseline)
Midblock Analysis (Links) (using HCM method)
o Forecasted LOS for links during three phases of project, using worst‐case scenario
(project plus baseline)
Ramp Analysis
o Forecasted impacts to on‐ and off‐ramps for three phases of project, using worst‐case
scenario (project plus baseline)
Cumulative Analysis
o For three phases of project, using worst‐case scenario
o Cumulative projects may include, but not necessarily be limited to:
Monterey Park Market Place
TRTP
New Mesa Substation Distribution Substation Plan Circuit
Mesa Substation 66‐kV Capacitor
200 East Markland Drive Specific Plan
2015 Potrero Grande Drive Specific Plan
Potrero Grande Drive Sewer Spot Repairs
Montebello Hills Specific Plan
Garfield Village Specific Plan
8: ParkingImpacts Parking During Construction
o Location of staging yards and other parking areas for vehicles associated with substation
construction
o Parking quantity
Parking During Operation
o Location and quantity
9: OtherConstructionImpacts Unusual Circumstances (e.g., truck turn radius issues, use of oversize/overweight vehicles and
any resultant safety issues, potential damage to pavement surfaces and measures for repairing
damage)
Impacts at non‐substation construction areas (e.g., telecom, other substations)
o Lane closures
o Duration of construction activities
o Number and type of vehicles involved
Proposed Traffic Control
o Lane Closures
o Construction Signage
o Safety Features
o Detours