Final environmental impact statement : proposal for the TVX Mineral Hill Mine : consolidated closure plan modifications near Gardiner, Montana

446 Pages·2001·21.6 MB·English

by  Montana. Department of Environmental Quality

MONTANADEPARTMENTOFENVIRONMENTALQUALITY
PERMITTINGANDCOMPLIANCEDIVISION
RECORDOFDECISION
For
TVXMineralHill,Inc.
OperatingPermitNo.00100
Amendment002
ConsolidatedClosurePlanModifications
May10,2001
I. IntroductionandBackground
TVXMineralHill,Inc.(TVX)producedgoldattheMineralHillMinenearJardine,
ParkCounty,Montana,underOperatingPermitNo.00100,from1989through
September1996. TheoriginalpermitwasissuedonFebruary14,1988. Since
then,oneamendmentand19modificationshavesupplementedthepermit. The
permitcovers424acres. Thesiteconsistsofthemine,processingfacilities,the
JardineHistoricDistrict,andthetailingsstoragefacility. Atotalof69acreshave
beendisturbedtodateaspartofOperatingPermit00100.
TVX,throughitsmineoperatorAmerikanuak,Inc.,planstoreclaimtheminesite
completely. TVX,initsConsolidatedClosurePlan(CCP),proposestomodify
theapprovedreclamationplan.Therevegetationplanwouldalsobemodified.
Thetailingsstoragefacility(TSF)wouldreceivea48-inchwaterbalancecap,
insteadofthecurrentlyapproved15-inchwaterbarriercapovera9-inch
compactedbentonite-amendedlayeroftailings. Anyseepagethatwould
eventuallyreachtheTSFunderlinerwouldbetreatedinabiologicaltreatment
systemandhabitatdevelopmentsite,insteadofinareverseosmosisplant.
ThemajorityofthewaterfromtheCreviceAditwouldbeconveyedinaburied
pipelinetoBearCreek.TheCreviceAditwatermeetsallwaterqualitystandards.
Upto50gpmofthewaterfromtheCreviceAditwouldbeconveyedtoastorage
tankforpotentialdomesticuseandfireprotectionintheJardinearea.
The1300Aditwaterwouldbetreatedinachemicaladditionbuildingwithferric
sulfatetoremovearsenicandthendischargedtotheexistingsepticdrainfields.
TheDraftandFinalEnvironmentalImpactStatements(EIS)examinetheimpacts
oftheCCPandalternatives.
TheMontanaDepartmentofEnvironmentalQuality(DEQ)mustdecidewhether
topermittheCCPandwhatmitigationmeasurestoimposetoreduce
environmentalimpacts. DEQmustalsodecideonrevisionstotheMontana
PollutantDischargeEliminationSystem(MPDES)PermitNo.MT-0030252for
TVXConsolidatedClosurePlan-RecordofDecision 1
waterdischargestoBearCreekandgroundwater. Thesedecisionsare
documentedbelow.
II. Decisions
Afterconsideringtheproposal,issues,alternatives,potentialimpacts,public
commentsandmanagementconstraints,DEQhasselectedtheAgency
ModifiedPlan. Theproposedaction,asmodifiedbyDEQ,isapprovedfor
implementationasdescribedinthisRecordofDecision(ROD).
Mitigationmeasurestoreduceenvironmentalimpactsandtoimprovethe
potentialforlong-termreclamationsuccesswillbestipulatedtoAmendment002
totheoperatingpermitbeforethisdecisioncanbeimplemented. Thisapproval
isgivenundertheauthorityoftheMetalMineReclamationAct(MMRA). The
Applicant’sProposedPlanandtheAgencyModifiedPlanaredescribedin
detailinChapter2oftheDraftEIS.
III. Amendment002Stipulations
Stipulation100-002-01:TVXmustconstructthetailingsstoragefacility(TSF)
tforreartemveinetwsaynsdtaepmpsroavnadlpbiepfeolrineeismipnle2m0e0n1ta.tTioVnX.mIufstthesTubSmFitsfeienapladgeesibigonlsogtiocaDlEQ
treatmentsystemisshutdownforrepairsormaintenance,TVXmustimplement
thefollowingcontingencyplans.InQptionA,whichisthefirstcontingencytobe
implemented,TVXmustaddupto184gpmofCreviceAditwatertotheTSF
seepagepipeline,tomeetthegroundwaterarsenicstandardof0.02mg/I,before
thewaterenterstheuplandhabitatdevelopmentsite(HDS). Themixedwater
mustbemonitoredbeforeitenterstheuplandFIDS.
IfOptionAisnotimplementableforanyreason,TVXmustimplementOptionB.
InOptionB,TVXmustaddupto200gpmofCreviceAditwatertotheTSF
seepageinthewetmeadowFIDS. OverflowfromthewetmeadowFIDSmust
reporttoanephemeraldrainagefordischargeintoBearCreek. Thequalityof
theoverflowmustbemonitored,andthemixtureofCreviceAditwaterandTSF
seepageadjustedtomeetrequirementsoftheMPDESpermit. AnewOutfall
A00p6pemnudsitxbDeaofddtheedDtroafttheEIMSPfDorESacpoenrcmeitp.tuaSleedrFaiwgiunrgeo1f,tOhpeticoonnstiAngaenndcyBpilnans.
Rationale:ThesecontingencieswillensureimpactsfromTSFseepagewillbe
preventedifthetreatmentsystemisshutdownforrepairsormaintenanceand
willensurecompliancewithwaterqualitystandards.
S1t3i0p0ulAadtiiotndi1s0c0h-a0r0g2e-0c2he.mTiVcaXlmaudsdittisounbmbiuitlddiensgigannddrpaiwpienlginsesfofrotrhDeEpQropreovsieedwand
approval. Thetreatmentsystemandpipelinemustbeconstructedin2001. An
additionalwaterqualitymonitoringstationmustbeestablishedtomonitorthe
TVXConsolidatedClosurePlan-RecordofDecision 2
effluentfromthechemicaladditionbuildingaftertheferricsulfateadditionand
mixing. Monitoringmustalsobeperformed12timesperyearinthedosingtank
beforedischargeofwatertothedrainfields.
Twocontingencieshavebeendeveloped. InOptionC,ifthetreatmentsystemis
downforrepairsorreplacement,TVXmustmixupto190gpmofCreviceAdit
waterwiththe1300Aditwaterpriortodischargetogroundwater.TVXmustalso
burytheexisting1300AditdischargepipelinetoBearCreek. InOptionD,ifthe
ferricsulfatecoprecipitationsystemneedsmaintenanceorrepairs,CreviceAdit
watermustbemixedwiththe1300AditdischargeandOutfalls003and001 must
beused.SeeFigure1,OptionsCandDinAppendixDoftheDraftEISfora
conceptualdrawingofthecontingencyplans.
Rationale:Thesecontingencieswillensureimpactsfrom1300Aditdischargewill
bepreventedifthetreatmentsystemisshutdownforrepairsormaintenanceand
willensurecompliancewithwaterqualitystandards.
Stipulation100-002-03:TVXmustconstructthenewCreviceAditwatersystems
ibnef2o0r0e1c.onFsitnraulctdieosni.gnTpVlXanwsomuulsdtbbeersequubimrietdtetdofuosreatgheencCryerveivcieeAwdiatndwaatpeprroinval
othercontingencyoptionsifneededfortreatmentofTSFseepageorthe1300
Aditdischarge.
Rationale:ThisuseofCreviceAditwaterwillensureimpactsfromthe1300Adit
dischargeandTSFseepageareprevented.
Stipulation100-002-04:TVXmusthireaminedlandrevegetationspecialistto
preparearevisedrevegetation,revegetationmonitoringandnoxiousweed
monitoringandsoilamendmentplanbasedonrecommendationsinAppendixB
intheDraftEIS. Therevegetationplanmustincludearevisedseedmixand
seedingrateforthesitethatwouldfavorsurvivaloftreeandshrubspecies,allow
naturalinvasionofothernativespecies,andcontrolerosion. Theplanwould
includemoretreeandshrubplantingontheslopesoftheTSF.Theplanmust
ensureadequatemeasuresaretakentoguaranteedominancebytreesand
shrubs,especiallyontheTSF.
Thisrevegetationmonitoringplanmustspecifythemethodologiesforannual
measurementstobeemployedinthemonitoring,lengthofmonitoringand
reportingfrequency. Monitoringmustincludevegetativecanopycover,
production,andspeciesdiversity,woodyplantsurvival,soilmicrobecommunity
dynamics,soilfertility,noxiousweedcontrol,invasionbyothernativespecies
anderosion. Ifvegetativecanopycoverandspeciescompositiononrevegetated
areasarelessthantheEcologicalDynamicSimulationmodel’s(EDYS)second
yearpredictions,TVXmustproposeandimplementremedialvegetation
enhancement.
TVXConsolidatedClosurePlan-RecordofDecision 3
TVXmustcontinuetomonitorandcontrolnoxiousweedsonrevegetatedareas
atleastuntiltheDouglasfirseedlingsarewellestablished. Spotsprayingmust
beusedforweedcontroltopreventinjurytodesirabletreesandforbsthat
becomeestablished.
Therevegetationspecialistmustproviderecommendationsforfertilizerand
organicmatteramendmentsandapplicationrates.TVXmustusewoodwaste
organicamendmentsforareastobedominatedbytreesandshrubs,especially
ontheTSF.
TherevisedplansmustbesubmittedtoDEQbeforerevegetationcommencesin
2001. TVXmustfencetheTSFtoprotecttheshrubsandtreesfrombrowsing
animalsuntiltheyaresuccessfullyestablished.
Rationale:Theseplansareneededtoensurerevegetationsuccess.The
revegetationplanwillhelpprovideforthetimelyestablishmentandlong-term
survivalofvegetationforerosionandseepagecontrol. Thesemeasureswillhelp
encouragemoreDouglasfirsurvivalandgrov\rthandnaturalinvasionbyother
nativespecies. Dominanceofdeep-rootedDouglasfirontheTSFwillreducethe
long-termpotentialforwaterqualityproblemsfromTSFseepagebyremoving
waterfromthewaterbalancecapthroughevapotranspiration. Adensestandof
treeswillreducelong-termnoxiousweedsurvivalontheTSF. Theuseofwood
wastewillhelpensuredominancebyDouglasfirandreducethelong-termriskof
noxiousweedinvasionontheTSF.
Monitoringwillensureproblemsareidentifiedsomodificationscanbemadeas
needed.
Stipulation100-002-05:TVXmustmonitorflowsatthespringabovetheOld
TailingsNortharea.
Rationale:Thisstipulationwillensurethatthe1300Aditdischargebeingadded
tothesepticsystemdoesnotexceeddrainfieldcapacity.
Stipulation100-002-06:TVXmustsampleforthiocyanateintheTSFseepage
beforeandafterthebiologicaltreatmentsystemuntiltheagencyagreesthat
thiocyanateconcentrationsarenotaproblem.
Rationale:Thiswillensurethatthiocyanatedoesnotkillthevegetationinthewet
meadowHDS.
Stipulation100-002-07:TVXmustsubmitareviseddetailedmonitoringand
maintenanceplanupdatingtheCCPtoreflectaccuratelythechangesmade
throughtheEISandthisROD. ThisplanwillbeduetoDEQbytheendof2001.
TVXConsolidatedClosurePlan-RecordofDecision 4
Rationale:ThesechangesupdatingtheCCPwillmakethemanenforceablepart
ofOperatingPermit00100.
Stipulation100-002-08:TVXmustprovidereplacementpagesfortheCCP
documentincorporatingallstipulationsaspartoftheCCPrequirements.
Rationale:IncorporationofthestipulationsintotheCCPmakestheman
enforceablepartofOperatingPermit00100.
Stipulation100-002-09:IfTVXdoesnotcompleteconstructionofthewater
treatmentsystemsin2001,thenDEQwillbondfortheirconstruction.
Rationale: TVXhasconstructedportionsofthewatertreatmentsystems. TVX
hascommittedtoconstructtherestofthetreatmentsystemsin2001. DEQhas
notbondedforthedirectcostsofconstruction. Thisstipulationwillensurethat
thetreatmentsystemswillbebondedifTVXdoesnotcompleteitsperformance
schedule.
Stipulation100-002-09:IfTVXconvertstheletterofcredittoasuretybond,then
DEQwillrecalculatethebondcostsassociatedwithInterimMaintenanceand
Shutdown.
Rationale:DEQhasnotincludedtheextracostsassociatedwithcollectinga
suretybondinthebondcalculations. Aletterofcreditisamuchmoreliquid
financialinstrument. ThisstipulationensuresthatDEQwouldhavetheabilityto
bondforextramoneytocollectonthesuretybond.
IV. Implementation
ThisdecisioniseffectiveuponsigningofthisRQD. TVXmayimplementsurface
disturbingactivitiesimmediately. Thereclamationperformancebondmustbe
submittedtoDEQwithin30daysofthisRQD.
A. OtherRightsandPermits
Approvalofthepermitamendmentdoesnotconveyorcreateanyrealproperty
rightsoruserights.
TVX’sStormWaterPollutionPreventionPlan(SWPPP)wasapprovedunder
GeneralDischargePermitforStormWaterAuthorizationMTR300232. TVXalso
holdsAuthorizationtoDischargeundertheMontanaPollutantDischarge
EliminationSystem(MPDES)MT-0030252.
TVXholdsAirQualityPermit#2087-06.
TVXConsolidatedClosurePlan-RecordofDecision 5
TVXisresponsibleforobtaininganypropertyrights,easements,mineralrights,
orwaterrightsnecessarytoimplementtheoperatingpermitamendment. TVXis
responsibleforobtaininganyotherlocal,state,orfederalpermits,licenses,or
reviewsthatmightbenecessarytoimplementtheoperatingpermitamendment.
Duringimplementationofthisdecision,TVXmayproposewaivers,exceptions,or
modificationstothereclamationplansandassociatedstipulationsorconditions.
Suchchangescouldbeappropriatetoallowtheuseofalternatemitigation
methodsthatmightbedevelopedinthefuture,ortorespondtoanimproved
understandingofsiteconditionsgainedthroughoperationalexperience.
Anyproposedchangestotheoperatingprocedures,schedule,reclamation
design,ormitigationmeasureswillbereviewedbyDEQandacceptedifthe
changewouldprovideresourceprotectionequaltoorgreaterthantheoriginal
requirement,andwouldnotresultinsignificantimpactsnotidentifiedintheEIS.
Proposedchangesthatwouldnotachievethesamelevelofresourceprotection,
orwouldresultinpreviouslyundisclosedsignificantimpacts,wouldrequire
supplementalenvironmentalanalysispriortodeterminingtheiracceptability.
B. ReclamationBond
Areclamationbondistobepostedandmaintainedinanamountthatwould
enableDEQtoimplementthereclamationandotherplansasstipulatedabove
andinprioramendmentsshouldTVXbeunableorunwillingtodoso. The
reclamationbondmaybepostedincrementallyorreleasedtoreflectstagesof
performanceofreclamation,butwillalwaysremainatanamountadequateto
payforthereclamationofanydisturbancethatmightexist.
ThebondisreviewedonceayearbyDEQaspartofanannualbondoversight
processrequiredbytheMMRA,Section82-4-338,MCA. Theentirereclamation
costestimatewillbereviewedandadjustedbyDEQatleastevery5yearsas
requiredbytheMMRAtoaccountforchangesinreclamationcostsandinflation.
Thepublicwillbenotifiedoftheresultsofthe5-yearbondreviewprocessand
anyproposedbondreleasesandwillbeprovidedtheopportunitytocomment.
ThereclamationbonddoesnotrepresentthelimitsofTVX’sliabilityshould
actualreclamationperformancefailtomeettherequirementsinthereclamation
planorcomplywithenvironmentallaws.
IncomplyingwiththefullextentoftheMMRA,Section82-4-338,areclamation
bondhasbeenestimatedfortheMineralHillMinereclamationplan. Basedupon
theinformationsubmitted,thebondhasbeenestimatedat$3,348,000for
reclamationactivitiesand$5,189,000forwatertreatment,foratotalof
$8,537,000. Interestratesorindicesusedtocalculatethebondamountsmay
changewithtime. Therefore,anybondamountsusedintheRQDaresubjectto
changeovertime.
TVXConsolidatedClosurePlan—RecordofDecision 6
Thisbondestimatehasbeenpreparedfortheselectedalternative(seeattached
BondSummarySheetinAppendixROD-A). Provisionsinthestipulationsare
includedaslineitemsandcontingencieswithinthebondasneeded. Supporting
detailsofthebondingsummaryareavailablefromDEQ. Lineitemspreparedby
theDEQtodeterminethetotalamountoftheletterofcreditbondrequiredare
notlimitationsonhowtheDEQmayspendanyofthebondproceedsfromthe
letterofcredit.
Thisbondestimatehasbeendividedintospecificitems:
(1) Faabcainlidtoinesedinecqluudiepsmecnoltleacntdingmaatenrdiadliss,podseimnogliosfhpientgrsotlreuucmtuwraesstae,ndremoving
removingdebris,recontouringthefacilitiesareaandotherbuildingsites,
haulingandspreadingsoil,andestablishingvegetationandweedcontrol.
(2) TailingStorageFacilityincludesconstructingdiversionditchesandhaul
roads,constructingthewaterbalancecap,andestablishingvegetation
andweedcontrol.
(3) OldTailingsSouthincludesestablishingvegetationandweedcontrol.
(4) Roadsincludesreclaimingroads.
(5) UndergroundOpeningsincludesclosingthe1050LevelPortal,closing
the1200LevelPortal,backfillingventandfillraises,closingthe610Level
Portal,andreplacingbatgratesattheLastChancePortalandCrevice
Adit.
(6) DevelopmentRockPilesincludesregrading,placingtopsoil,seedingand
weedcontrolonTopofMineralHill,the450LevelDump,andthe750
LevelDump,reclaimingthe1050LevelDump,reclaimingthe1200
Level/34000TonDump,regrading,placingtopsoil,seedingandweed
controlonthe13038TonDump,andreclaimingthe610Level“Crevice”
Dump.
(7) Miscellaneousincludessurveyingandstaking,abandoningseptictanks,
reclaimingthealluvialmaterialsourcesite,abandoningwaterlines,
cleaningupandseedinglaydownsites,reclaimingtopsoilstockpileareas,
andinstallingafencearoundtheTSF.
(8) InterimMaintenanceandShutdownincludesattorneyfeesformanaging
letter-of-creditbonds.
TVXConsolidatedClosurePlan-RecordofDecision 7
(9) SiteManagementDuringReclamationincludesretainingathird-party
engineeringfirmtomanagethesite,includinglabor,power,insurance,
taxes,leases,vehicles,computers,etc.
(10) WaterTreatmentincludesthecostsofwatermonitoring,MPDESpermit,
wellabandonment.Well#10remediation,TSFseepagebiological
treatmentsystemandwetmeadowanduplandHDS,TSFseepage
dischargecontingencies,1300Aditdischargechemicaladditionsystem
andseptictank,1300dischargecontingencies.CreviceAditwatersystem,
andtemporaryreverseosmosistreatmentplant.
OthercostsassociatedwiththereclamationoftheMineralHillMineinclude
contingencies(5%),mobilization(5%),engineeringdesign(5%),agency
administration(5%),andinflation(3%over5years,or16%).
Asnotedabove,TVXmayimplementthedecisionimmediatelywhentheRODis
signedandTVXreceivestheOperatingPermit00100,Amendment002approval
form. Thebondmustbesubmittedwithin30daysaftertheRODissigned.
Thefinalbondamountincludesreclamationcostsassociatedwithdisturbance
createdbyTVXunderExplorationLicense00559. Oncethenewbondisposted
andapprovedbyDEQ,DEOwouldreleasetheexistingexplorationbondletterof
creditandplacetheexplorationlicenseinactive.
BondreleasemayberequestedincrementallybyTVXascompletedactivities
meetthereclamationstandardsoutlinedinMMRA. Whenbondreleaseis
requested,DEQwillevaluatetherequestandsolicitpubliccommentasrequired
bySection82-4-338,MCA,priortomakingadecision.
V. IssuesandAlternatives
TheEISandthisRODhavebeenpreparedinresponsetoTVX’sapplicationand
issuesandconcernsidentifiedthroughpubliccomment. Analternativewas
developedtoaddresssignificantissues. Theseissuesandthealternativeare
summarizedbelowandpresentedindetailintheDraftEIS. Thepreferred
alternativeidentifiedintheDraftEISistheAgencyModifiedPlan. This
alternativehasalsobeenselectedforimplementationfollowingpreparationofthe
FinalEIS. Thisdecisiontookintoaccounttheimpactsofthealternativesaswell
aspubliccommentandthepotentialforthealternativestoresolvetheissues.
PublicScopingandComments
AnoticewassentoutonMay24,2000,announcingthepublicscopingmeeting.
ThescopingmeetingwasheldinGardineronJune15,2000. Sixpeoplesigned
theattendancelist.
TVXConsolidatedClosurePlan-RecordofDecision 8
TheDraftEISwasreleasedFebruary13,2001. TheDraftEISpresentedthree
alternatives,includingthenoactionalternative,TVX’sproposedaction,andthe
preferredalternative. TheDraftEISdisclosedtheaffectedenvironmentandthe
environmentalconsequencesofeachalternative.
ApublichearingwasheldinGardineronMarch7,2001,toreceiveoral
commentsontheDraftEIS. Twentypeoplesignedtheattendancelist. Four
peoplepresentedcomments. Thirteenlettersande-mailmessageswerealso
received. ThepublicreviewperiodendedonMarch20,2001.
AllcommentswerereviewedandconsideredduringpreparationoftheFinalEIS.
Commentsthatpresentednewdata,questionedfactsoranalysis,orraised
questionsorissuesbearingdirectlyonthealternativesorenvironmentalanalysis
receivedaresponseintheFinalEIS. Commentsexpressingpersonalopinions
wereconsideredbutdrewnoresponse.
AbondreleasehearingwasheldonApril26,2001 inGardiner. Sixpeople
attendedthehearing. Commentsreceivedonthebondwereusedtocalculate
thefinalbondamount(SeetheattachedTableH-1 FinalBondSummarySheet
inAppendixH). AlsoseeAppendixHfortheresponsestopubliccomments
receivedatthebondhearingandfromlettersreceivedduringthebondrelease
commentperiod.
A. IssuesandAlternativeDevelopment
AppendixAoftheDraftEISdescribestheissuesraisedbyagencyspecialists
andthepublic. Significantissuesthatreceiveddetailedstudyaredescribedin
Chapter2oftheDraftEISandaresummarizedbelow.
Issue1. TailingsStorageFacility(TSF1-BiologicalTreatmentSystem.Cap
Design
ResidualdrainagefromthereclaimedTSFwouldcontinueindefinitely. The
existingapprovedplandoesnotincludewatertreatment. Theproposedaction
wouldemployabiologicaltreatmentsystemandwetmeadowhabitat
developmentsitethathasbeensuccessfulelsewhere. Concernshavebeen
raisedregardingtheproposedTSFseepagebiologicaltreatmentsystemandthe
effectivenessoftheproposedwaterbalancecapdesigninreducinginfiltration.
EffectsfromtheTSFcapdesignalternatives,suchasrevegetationpotential,root
penetration,treefall,fireandclimaticeffects,areofconcern. Long-termwater
treatmentofTSFseepageisalsoaconcern.
TVXConsolidatedClosurePlan-RecordofDecision 9
Issue3. CreviceAditWaterSystemDesign
WaterdischargesfromtheCreviceAdittoOutfall001 arecurrentlypermitted
underanMPDESpermit. ThreeoutfallstoBearCreekhavebeenpermitted.
ThefirstisthedischargefromtheTSFunderdrainsystemfollowingtreatment.
Thesecondisacombinedoutfallofthetwominedrainagesources:1)the
CreviceAditwater,whichisofhighqualityandrequiresnotreatmentpriorto
discharge,and2)the1300Aditwater,whichhaselevatedlevelsofarsenic,and
isdischargedtoOutfall003.
Thecombinationofthetwominedischargesresultsinnomeasurableimpactto
BearCreekwaterquality. Proposedreclamationactivitieswouldmodifythe
CreviceAditwatersystemdesigninthatthepipelinefromtheCreviceAditto
BearCreekwouldbeburiedbelowfrostdepth. The1300Aditdrainageline
wouldbeseparatedfromtheCreviceAditdrainageline.
Concernshavebeenexpressedaboutthechangestotheexistingsystems
becausethewatercurrentlymeetswaterqualitystandardsbeforedischargeto
BearCreek.
Issue4. 1300AditDrainaqe
Undertheproposedplan,dischargeof1300AditwaterdirectlytoBearCreek
wouldbeeliminated. The1300Aditdischargelinewouldbeseparatedfromthe
CreviceAditwaterline,buried,andthedrainagetreatedinachemicaladdition
buildingwithferricsulfateandroutedtotheexistingseptictank. Thetreated
effluentwouldbedischargedfromthedosingtankintothetwodrainfieldsat
Outfall005.
Concernshavebeenraisedabouttheeffectivenessofthisproposedsystemand
long-termcareandmaintenanceofthesystem.
Issue5. Long-TermMonitoringandMaintenance
Theproposedplancontainsalong-termmonitoringplandesignedtotestforthe
successorfailureofreclamation. Fundingoftheongoingmonitoringand
maintenancerequirementsisanimportantconsideration. Thecurrentbond
wouldberevisedtoreflectagencyevaluationofthecosttosupportlong-term
monitoringandmaintenanceactivitiesandtoreflectreclamationperformedto
date.
Manyconcernswereexpressedabouttheamountofbondneededforlong-term
managementofthethreeproposedwatersystems. Also,questionswereraised
aboutwhatwouldhappentothebondifTVXdonatedthepropertytotheUSFS.
TVXConsolidatedClosurePlan-RecordofDecision 10