re: proposed changes to the operation and maintenance plan, … · 2016. 2. 9. · arizona...
TRANSCRIPT
February2,2016
Mr.RichardOlm,PEWasteProgramsDivisionArizonaDepartmentofEnvironmentalQualityPhoenix,Arizona85007
Re: ProposedChangestotheOperationandMaintenancePlan,Revision7RooseveltIrrigationDistrictWellheadTreatmentSystems
DearMr.Olm,Synergy Environmental, LLC (Synergy) has prepared proposed revisions to update the ADEQ-certified Roosevelt Irrigation District (RID) Wellhead Treatment Systems Operation andMaintenancePlan (O&MPlan). Theproposed revisions, as provided inAttachment1 to thisdocument, are shown in redline/strikeout to the current O&M Plan (Revision 6) that wassubmitted to Arizona Department of Environmental Quality (ADEQ) late last summer andapprovedbyADEQviayouremail,datedSeptember9,2015. Foryourrecords,wehavealsoprepareda“clean”versionoftheupdatedO&MPlan(Revision7)asAttachment2tothisletter.Asyouareaware,RIDisrequiredtoreviewtheWellheadTreatmentSystemsO&MPlanatleastannuallyforcompletenessandupdatetheO&MPlanasappropriate. InpreparationforRID’supcoming operating year, we have reviewed the current O&M Plan and have proposedrevisionstoprovideupdatedinformationandfurthercontexttotheRIDremedialactionsthataregovernedbytheO&MPlan. Suchupdates includetheremedialactionspursuanttoRID’sFeasibility StudyReport, approvedbyADEQonApril 13, 2015,which reduces thenumberofwells that will need treatment to only six wells from the eight wells required in the ADEQ-approved RID Modified Early Response Action, while still achieving all the Water QualityAssuranceRevolvingFund(WQARF)remediationcriteriaandallremedialobjectivesestablishedbyADEQfortheWestVanBurenAreaWQARFSite.YourpromptapprovaloftheupdatedO&MPlanisappreciated. Onceapproved,Synergywillsubmitacomplete,stampedcopyoftheRevision7WellheadTreatmentSystemsO&MPlan. Bestregards, SYNERGYENVIRONMENTAL,LLC
JoelPeterson,PE
cc: MisaelCabrera,ADEQ LauraMalone,ADEQ DonovanNeese,RID DavidKimball,Gallagher&Kennedy
ATTACHMENT1
OPERATION & MAINTENANCE PLAN
RID WELLHEAD TREATMENT SYSTEMS
Prepared for: Arizona Department of Environmental Quality
Prepared by: Synergy Environmental, LLC
On Behalf of: Roosevelt Irrigation District
WEST VAN BUREN AREA WQARF SITE JANUARY 2016
Revision 7 PHOENIX, ARIZONA
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TABLEOFCONTENTS
1.0 INTRODUCTION.............................................................................................................. 5
2.0 BACKGROUND................................................................................................................ 82.1 SITELOCATIONANDPHYSICALCHARACTERISTICS ......................................................................... 82.2 CONTAMINANTSOFCONCERN ...................................................................................................... 82.3 WATERQUALITY–TREATMENTSYSTEMWELLS ............................................................................ 9
3.0 SYSTEMDESCRIPTION .................................................................................................. 11
4.0 OPERATIONANDMAINTENANCE ................................................................................. 164.1 SYSTEMOPERATIONUPSETEVENTNOTFICATIONS ..................................................................... 164.2 WELLPUMPDETAILS.................................................................................................................... 174.3 LGACTREATMENTSKIDS.............................................................................................................. 194.4 SYSTEMOPERATION .................................................................................................................... 19
4.4.1 TreatmentMode ................................................................................................................... 204.4.2 BypassMode......................................................................................................................... 204.4.3 LGACChange-OutsandBackwash ........................................................................................ 21
4.5 INSTRUMENTATIONANDCONTROLS .......................................................................................... 234.5.1 WellPumps ........................................................................................................................... 244.5.2 FlowMeters .......................................................................................................................... 254.5.3 PressureTransmitters ........................................................................................................... 264.5.4 3-WayValves ........................................................................................................................ 264.5.5 SumpsandLevelSwitches..................................................................................................... 274.5.6 SCADASystem....................................................................................................................... 284.5.7 TemperatureSensors ............................................................................................................ 284.5.8 SiteSecurity........................................................................................................................... 284.5.9 SystemOperationUpsetEvents ............................................................................................ 29
4.6 SAMPLINGANDANALYSIS ........................................................................................................... 294.6.1 PurposeofSamplingandAnalysisProgram ......................................................................... 304.6.2 FrequencyandLocationsofSampling................................................................................... 304.6.3 SamplingMethods ................................................................................................................ 314.6.4 AnalyticalMethodsandProcedures ..................................................................................... 31
5.0 SPENTGACMANAGEMENT .......................................................................................... 34
6.0 DOCUMENTATIONANDREPORTING ............................................................................ 356.1 WEEKLYINSPECTIONFORMS ....................................................................................................... 356.2 MONTHLYPROGRESSREPORTING ............................................................................................... 35
7.0 KEYCONTACTSLIST...................................................................................................... 37
8.0 REFERENCESCITED....................................................................................................... 38
Deleted: 27
Deleted: 29
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TABLEOFCONTENTS(Continued)
TABLES
Table
1 SummaryofRecentWaterQualityData–TreatmentSystemWells
2 SummaryofWellConstructionInformation,RooseveltIrrigationDistrict
WellheadTreatmentSites
FIGURES
Figure
1 SiteLocationMap
2 SiteMapandVicinity
3 PipingandInstrumentationDiagram,RID-89WellheadTreatmentSystem
4 PipingandInstrumentationDiagram,RID-92WellheadTreatmentSystem
5 PipingandInstrumentationDiagram,RID-95WellheadTreatmentSystem
6 PipingandInstrumentationDiagram,RID-114WellheadTreatmentSystem
APPENDICES
Appendix
A RID-89WellheadTreatmentSystemDrawings
B RID-92WellheadTreatmentSystemDrawings
C RID-95WellheadTreatmentSystemDrawings
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TABLEOFCONTENTS(Continued)
APPENDICES(Continued)
D RID-114WellheadTreatmentSystemDrawings
E SiemensOperation&MaintenanceManual
F EquipmentManuals
G SCADASystemScreenShots
H Health&SafetyPlan
I AirtechEnvironmentalLaboratories–Method8260BSOP
J WeeklyOperationandMaintenanceInspectionForm
K ExampleChain-of-CustodyForm
L MonthlyProgressReportExample
Deleted: O&MPLANREVISIONSUMMARY
# ... [1]
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January2016,Revision7
OPERATIONANDMAINTENANCEPLAN–
RIDWELLHEADTREATMENTSYSTEMS
WESTVANBURENAREA
WATERQUALITYASSURANCEREVOLVINGFUNDSITE
1.0 INTRODUCTION
GroundwaterintheWestVanBurenAreaWaterQualityAssuranceRevolvingFundSite(WVBA
Site) containshazardous substances,principally volatileorganic compounds (VOCs) thathave
impacted Roosevelt Irrigation District (RID) production wells. Arizona Department of
EnvironmentalQuality(ADEQ)acknowledgedthattheRIDwellsthatextractanddischargeVOC-
contaminatedgroundwatertosurfacewaterarethemajoroutflowofcontaminationfromthe
Site (Terranext, 2012). Itwas furthernoted that theRID canals provide apotential routeof
surfacewatercontaminantmigrationwithinanddownstreamoftheWVBASite.
RID relies on the wells within the WVBA Site to meet critical water supply needs and,
consequently,submittedaWorkPlanforconductinganEarlyResponseAction(ERA)torestore
a portion of these impacted wells for current and reasonably foreseeable beneficial uses,
includingfutureuseasadrinkingwatersource(Montgomery&Associates,2010),asprovided
intheArizonaWaterQualityAssuranceRevolvingFundProgram:
• ArizonaRevisedStatus(ARS)§49-282.06.B.4.b;and,
• ArizonaAdministrativeCode(A.A.C.)R18-16-405.
AlthoughtheERAwasdesignedtocaptureandtreathazardoussubstancesprimarilyasawell
protectionandwatersupplyinitiative,theactionwasalsoproposedtomitigatepublicexposure
associated with the uncontrolled release of VOCs in groundwater pumped by RID from the
WVBA Site. Air and water sampling was conducted in accordance with the Public HealthExposureAssessmentandMitigationWorkPlan(SynergyEnvironmental[Synergy],2011a).Theresulting data enabled review of the potential insight into the fate and transport of these
contaminants (Synergy, 2011b). The assessment compared the sampling results to health-
basedguidelinestomakeascreening-leveldeterminationastowhetherthesesubstancespose
asignificantrisktopublichealthandprovidedatatoassist indevelopingdetaileddesignsfor
engineeringcontrolstolimituncontrolledVOCemissions.
Deleted: September
Deleted: 5Deleted: 6
Deleted: Environmental(Synergy)
Deleted: a
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Consistent with the Task 4-Engineering Design Study required by the ADEQ in the ERA
conditional approval letter of June 24, 2010 (ADEQ, 2010), RID submitted a proposal to
construct and operate a pilotwellhead treatment system at RID-95 and additional wellhead
treatmentatselectsites(SynergyEnvironmental,2011c).InaletterdatedSeptember2,2011,
ADEQauthorizedimplementationofRID’sproposedPilotSysteminitiative(ADEQ,2011).
Beforeinitiatingtreatmentattheadditionalwellsites(i.e.,RID-89,RID-92andRID-114)under
RID’s proposed Pilot System initiative, RID agreed to prepare and submit a near-term
assessment, following one month of system operation, to consider the technology, system
designand site-specificengineeringandoperationcontrols todetermine theeffectivenessof
liquid-phase granular activated carbon (LGAC) and the reliability of the system as
designed/operated to provide safeguards to protect public health in the event of system
failures (in accordance with A.A.C. R18-16-411). The 1-Month Technology/DesignDemonstration Report: RID-95 Pilot System (Synergy, 2012a), describes the successfulcompletion of the assessment period, which demonstrated the reliable operation of the
treatment system without identification of any design or operational issue that could
reasonablyendangerpublichealth.
On July 17, 2012, aModified ERA Proposal (Synergy, 2012b) was submitted to ADEQ as an
addendumtotheoriginalERAWorkPlan,datedFebruary3,2010andconditionallyapproved
byADEQonJune24,2010(ADEQ,2010). Theaddendumwasproposedinordertoprovidea
morecosteffectiveapproachtoaccomplishthegoalsoftheERAremedialaction.TheModified
ERAProposalprovidedanoptimizeddesignapproachtoaddressthehighestcontaminatedRID
wells located in the WVBA Site and incorporated information and insights gained from the
investigationsprescribedbyADEQintheoriginalERAWorkPlanletter(Tasks1through4)and
fromthePilotSysteminitiative. Basedonthedetailedconsiderationandanalysisofthisnew
information, RID proposed substantive modifications to the original ERA Work Plan, which
included utilizing a combination of treatment and blending to effectively reduce the
concentration of VOCs from several additional, lower concentration wells resulting in lower
volumeofwaterbeingdirectly treatedwhileprovidingahigher totalvolumeofgroundwater
thatisremediatedtomeetapplicablefederalmaximumcontaminantlevels(MCLs).OnOctober
19, 2012, Synergy submitted the Modified ERA Work Plan to ADEQ, which incorporated
applicable content from the original ERA Work Plan and from the Modified ERA Proposal
(Synergy,2012c).InaletterdatedFebruary1,2013,ADEQconditionallyapprovedtheModified
ERAWorkPlan(ADEQ,2013).
InJuly2014,RIDsubmittedaFeasibilityStudyReport(Synergy,2014a)toADEQpursuanttothe
RIDFeasibilityStudyWorkPlanapprovedbyADEQonJuly16,2013.TheRIDFeasibilityStudy
Reportwaspreparedtoevaluatepossiblegroundwateralternativeremediesanddeterminea
proposedgroundwaterremedyfortheWVBASitethatwouldaddressallRIDwellsthatwould
Deleted: b
Deleted: (Synergy,2012a)
Deleted: Synergy,2012b
Deleted: onFebruary1,2013
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not be fit for their current and reasonably foreseeable end uses due to the releases of VOC
contaminants (in accordancewithARS §49-282.06.B.4.b). Remedial strategies andmeasures
were developed tomeet all applicable remedial action criteria inARS §49-282.06 andA.A.C.
R18-16-407andformulatedintopossiblegroundwateralternativeremediesthatarecapableof
achieving theRemedialObjectivesestablishedbyADEQ for theWVBASite. RID submitteda
revised Feasibility Study Report (Synergy, 2014b) to ADEQ on November 26, 2014 that
addressedcomments fromADEQandwas subject topublic commentsandapublicmeeting.
ADEQapprovedRID’sFeasibilityStudyReport,includingtheproposedremedialaction,onApril
13,2015(ADEQ,2015).
ConsistentwiththeADEQletterdatedSeptember2,2011,thatagreedwithimplementationof
the Pilot System initiative, the Long-Term Operational Assessment Report, RID-95 WellheadPilot Treatment Systems documented the long-term performance of thewellhead treatment
systems inorder “…todeterminewhetherwellhead treatment canbeaneffective treatmenttechnology…(that results in)…reducing the cost of the final remedy…and/or mitigatingcontaminantexposure”(Synergy,2012d). TheAssessmentReport indicatedthattheRIDPilot
System initiative conclusively demonstrated the cost effectiveness of the technology, and
therefore the reasonableness of the selected remedy in the Modified ERA that was
incorporated and expanded in the Feasibility Study Report in order to effectively treat the
contaminatedgroundwaterimpactingRID’swellsandthesuccessfulmitigationofpublichealth
exposurestothesecontaminantsatallimpactedRIDwells.
PursuanttoA.A.C.R18-16-411,RIDwastoprepareandsubmitanOperationandMaintenance
(O&M)PlantoADEQtoimplementalloranyportionofaremedyorearlyresponseaction.This
O&M Plan, which was certified by ADEQ on April 10, 2015, provides equipment and
construction details, the sampling and analysis program, and specific O&M and reporting
procedures for theRIDwellheadtreatmentsystems included in theADEQ-approvedremedial
actions, and shall replaceall previouseditions. Updates and/or revisionswill continue tobe
madetothisO&MPlan,asnecessary. Ataminimum,thisO&MPlanwillbereviewedonan
annualbasistoconfirmaccuracyandcompleteness.
Deleted: forDeleted: (whichcouldbeincorporatedintothefinalremedyfollowing
Deleted: process)
Deleted: AspartofthescopeofworkdescribedinitsproposedPilotSystem
initiative
Deleted: Revision4,
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2.0 BACKGROUND
A summary of the physical setting, hydrogeologic and groundwater conditions, sources of
contamination and impacts on RID wells and operations was provided in the WVBA Site
RemedialInvestigation(RI)Report(Terranext,2012).TheRIReportwaspublishedbyADEQin
August2012,andincludedadiscussionofthenatureandextentofcontaminationintheWVBA
Site. Briefdescriptionsof theSite locationandphysical characteristics, thecontaminantsof
concern (COCs) present at the Site and the impact of the contamination on the RID water
systemsareprovidedinthefollowingsections.
2.1 SITELOCATIONANDPHYSICALCHARACTERISTICS
LandusewithintheWVBAispredominantlyzonedindustrialwithsmallertractsofresidential
(withelementaryschoolsandchurches)andcommercial.TheWVBASiteislocatedwithinthe
City of Phoenix Central City and Estrella urban villages (Figure 1). Based on data generated
through applied use of the Environmental Justice Screening and Mapping Tool (EJSCREEN)
developedbytheU.S.EnvironmentalProtectionAgency(EPA),thereareapproximately51,600
peopleresidingwithin thegeneralboundariesof theWVBASiteandthedemographicprofile
indicatestheresidentspredominantlycomprisealowincome,minoritypopulation.1Withthe
significant acreage of agricultural land available to be developed in the future, the Estrella
Village (41 squaremiles) is identified as a Phoenix targeted growth area, and is expected to
experiencesignificantincreasesinbothemploymentandresidentialgrowth(Synergy,2011b).
Figure 2 depicts the approximate boundaries of the groundwater contamination, as well as
relevantfeatureswithintheWVBASite.Theextentofgroundwatercontaminationassociated
withtheWVBASite isgenerallyboundedonthenorthbyMcDowellRoad,ontheeastby7th
Avenue,onthesouthbyLowerBuckeyeRoad,andonthewestbeyond79thAvenue.
2.2 CONTAMINANTSOFCONCERN
TheCOCsintheWVBASitehavebeenidentifiedbasedonhistoricalandpresentdataobtained
fromsamplescollectedbyADEQandRIDfromtheimpactedRIDgroundwatersupplywellsover
thepast20years. TheseCOCscomprise thecommingledWVBASiteplumeandare listedas
follows(includingthechemicalnameandtheChemicalAbstractService(CAS)number:
• 1,1-Dichloroethene(1,1-DCE) CASnumber75-53-4
1Seewww.epa.gov/ejscreenforenvironmentalindicatorsanddemographicdataapplicableto
thegeneralboundariesoftheWVBASite.
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• Tetrachloroethene(PCE) CASnumber127-18-4
• Trichloroethene(TCE) CASnumber79-01-6
• 1,1,1-Trichloroethane(TCA) CASnumber71-55-6
• cis1,2-Dichloroethene(cis1,2-DCE) CASnumber156-59-2
• 1,1-Dichloroethane(1,1-DCA) CASnumber75-34-3 ChromiumisalsoaCOCthatoccurs locallywithintheWVBASiteboundaries. Thechromium
concentrationsintheimpactedRIDwells(Synergy,2014b)arewellbelowthefederalMCLfor
drinkingwaterandhaveonlybeendetectedintwo(2)wells:RID-102andRID-104;neitherof
whichwas selected forwellhead treatment. Consequently, chromium is not included in the
samplingandanalysisprogramaspartofthisO&MPlan.
Only three (3) of the listed COCs (i.e., TCE, PCE and 1,1-DCE) are present in the impacted
groundwater within theWVBA Site at concentrations that exceed theMCLs. Consequently,
theseCOCsarereferredtoasthe“targetCOCs”inthisO&MPlan.ThetargetCOCswillbeused
todeterminewhenGACreplacementisnecessary.
2.3 WATERQUALITY–TREATMENTSYSTEMWELLS
A summary of recent historical analytical data that presents target COC concentrations for
samplescollectedbyADEQfromRIDtreatmentsystemwellsisincludedbelow.Allresultsthat
areequaltoorexceedMCLsareindicatedinredtext.
Table1.SummaryofRecentWaterQuality–TreatmentSystemWells
Allconcentrationsarepresentedasmicrogramsperliter(µg/L):
WellRID-89 WellRID-92 WellRID-95 WellRID-114Sample
Date TCE PCE 1,1-DCE TCE PCE 1,1-DCE TCE PCE 1,1-DCE TCE PCE 1,1-DCE
Mar-13 34.1 11.0 2.39 73.5 14.7 5.17 54.4 3.44 9.23 48.6 2.20 3.33
Sep-13 37.5 11.7 3.14 86.4 14.5 6.22 59.6 3.71 7.52 39.0 2.63 2.50
Mar-14 35.5 10.3 2.84 76.2 13.5 4.84 44.0 2.99 6.18 45.6 2.86 3.01
Mar-15 33.8 9.39 2.68 81.6 12.3 4.39 42.2 2.80 5.74 48.1 2.51 2.84
2.4 TREATMENTGOALS
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TheminimumstandardfortreatedwaterqualityatthewellheadtreatmentsystemsistheMCL
foreachofthetargetCOCs,whichisconsistentwiththefinalRemedialObjectivessetforthin
the Final RI Report, AppendixAA (Terranext, 2012). The currentMCL for each of the target
COC’sisprovidedinthefollowingtable.
TargetCOC MCL(µg/L)
Trichloroethene(TCE) 5.0
Tetrachloroethene(PCE) 5.0
1,1-Dichloroethene(1,1-DCE) 7.0
Thepointofcompliance(POC)sampleports(installedinthe14-inchdischargepiping,located
downstream of the treatment skids and immediately upstream of the receiver box for each
treatment system, see Figures 3-6) is the location for demonstrating that each treatment
systemachievestheseTreatmentGoals.
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3.0 SYSTEMDESCRIPTION
RID has selected a pre-engineered LGAC system, manufactured by Siemens Water
Technologies, to treat the discharge from the impacted RID production wells. The selected
LGACsystems,describedinmoredetailinSection4.3,aremodularandconsistoftwo(2)GAC
pressurevessels,atreatment“skid”,withacapacityof1,000gallonsperminute(gpm,nominal)
with Siemens stated maximum of 1,100 gpm. The treatment skids are installed on and
anchored to concrete containment pads with 6-inch curbing and sumps. Each discharge
structure is enclosed and sealed for volatilization control. Wellhead treatment will be
conducted in amanner consistentwith theADEQ-approved remedial actions. Design/record
drawingsforthepreviously installedwellheadtreatmentsystemsare includedasAppendixA
(RID-89),AppendixB(RID-92),AppendixC(RID-95),andAppendixD(RID-114).Design/record
drawings for the additional wellhead treatment systems that will be installed pursuant to
ADEQ-approvedremedialactionswillbeincludedtosupplementthisO&MPlan.
Deleted: highest
Deleted: RIDhistoricalpumping
Deleted:
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1. RID-89: Located on the east side of 51st Avenue, approximately ¼-mile north of
BuckeyeRoad;thesiteareaisapproximately4,500squarefeet(ft2).Basedonnominal
flowrateof3,400gpm,RIDinstalledthreeskids.
Fromthenorth(left)tothesouth(right),eachpairofvessels(skids)arenumbered1,2,
and3;withindividualvesselslabeled(again,northtosouth):89-1Aand89-1B(skid1);
89-2Aand89-2B(skid2);and89-3Aand89-3B(skid3).
1A1B
2A 2B 3A 3B
51StAvenue
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2. RID-92: Located on the east side of 43rde Avenue, approximately ¼-mile north of
BuckeyeRoad;thesiteareaisapproximately2,400ft2. Basedonnominalflowrateof
1,400gpmandlimitedavailablefootprint,RIDinstalledasingleskid.
Vesselsarelabeled92-1A(westvessel)and92-1B.
1A1B
43rdAvenue
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3. RID-95: Located on the northeast corner of Sherman Street and 35th Avenue,
approximately¼-milenorthofBuckeyeRoad; thesitearea isapproximately6,900 ft2.
Basedonnominalflowrateof1,850gpm,RIDinstalledtwoskids.
From south to north, skids are numbered 1 and 2; with vessels labeled: 95-1A (east
vessel)and95-1Bforskid1;and95-2A(westvessel)and95-2Bforskid2.
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4. RID-114:Locatedatthesouthwestcornerof23rdAvenueandVanBurenStreet;thesite
areaisapproximately7,000ft2.Basedonnominalflowrateof2,500gpm,RIDinstalled
threeskids.
Fromnorthtosouth,skidsarenumbered1,2,and3;withvesselslabeled:114-1Band
114-1A(skid1);114-2Band114-2A(skid2);114-3Band114-3A(skid3).
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4.0 OPERATIONANDMAINTENANCE
Thefollowingsectionsdescribethespecificdetailsforoperatingandmaintainingthewellhead
treatmentsystems, includinganotificationsprocedureduringsystemoperationupsetevents;
and details for RID’s well pumps, the selected LGAC treatment skids, wellhead treatment
systemoperations,instrumentationandcontrols,andthesamplingandanalysisprogram.
4.1 SYSTEMOPERATIONUPSETEVENTNOTFICATIONS
TheOperator receivesautomatednotifications (onhismobilephone) toalert in theeventof
certain control conditions described in detail in Section 4.5.9, and is required to respond, as
appropriate, toeachnotificationwithin2hours. TheOperatorwillnotifyRIDandSynergy in
the event of significant process control change(s), problem(s) or failure(s). As soon as the
issue(s)oftheeventarereviewedandfullyunderstood,SynergywillnotifyADEQbytelephone
within24hoursofoperationalchangesmadetothewellheadtreatmentsystems,ifthequality
ofthetreatedwatercouldbeaffected,orifreleasestotheenvironmenthaveoccurred.
ContactinformationfortheindividualstobenotifiedbyOperator/Synergyisincludedbelow:
RooseveltIrrigationDistrict
DonovanNeese,PE KenCraig
Superintendent WaterOperationsManager
Email:[email protected] Email:[email protected]
Phone:(623)670-4760 Phone:(623)695-5855
On-DutyWaterMaster:(623)386-2046
AgencyOversight
ScottGreen
ArizonaDepartmentofEnvironmentalQuality
Email:[email protected]
Phone:(602)771-1612
In accordance with A.A.C. R18-16-411(E)(4), this O&M Plan shall include “a process for the
treatmentsystemOperatortopromptlynotifypotentiallyaffectedwaterprovidersofafailure
of a key treatment systemcomponent that couldaffect thequalityof adischargeof treated
water.”
TreatedwaterfromthewellheadtreatmentsystemscurrentlyisexclusivelydischargedtoRID
canals and laterals foragriculturaluse.Consequently, therearenootherpotentially affected
Deleted: (SpinnakerHoldings,LLC)
Deleted: SpinnakerHoldings
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waterproviderswithintheWVBASitethatwouldbeaffectedbyadischargeoftreatedwaterin
the event of significant process control issues or failures at any of the wellhead treatment
systems.However,atsuchtimeinthefuturewhenRIDplanstoservetreatedwatertopersons
orparties formunicipal and industrial enduse, thisO&MPlanwill be revised to identify the
affected water provider(s) and the process by which RID will promptly notify those water
providersofanyfailureofakeytreatmentsystemcomponentthatcouldaffectthequalityof
thedischargeoftreatedwater.TherevisedO&MPlanwillbesubmittedforADEQapprovalat
least90dayspriortoinitiationofwaterdeliverytotheaffectedwaterprovider(s).
4.2 WELLANDTREATMENTSYSTEMDETAILS
Table2providesdetailsforwellconstruction(i.e.,holedepth,screenintervals,unitsscreened,
casingtotaldepthandcasingdiameters),historicaldepthtowaterandpumpingwater levels,
andpumps/motorscurrently installedandoperatingateachwellheadtreatmentsystemsite.
ThecontrolstrategyforeachwellpumpisprovidedinSection4.5.1.Followingisasummaryof
normal operating values for each of the currently installed wellhead treatment systems. A
similardescriptionoftheoperatingparametersfortheadditionalwellheadtreatmentsystems
that will be installed pursuant to ADEQ-approved remedial actions will be included to
supplementthisO&MPlan.
RID-89
ParameterNormal
OperatingValue
WellheadPressure(Bypass) 0.5psi
WellheadPressure(Treatment) 16.5psi
FlowRate(Bypass) 3,200-3,300gpm
FlowRate(Treatment) 2,300-2,600gpm
Skid1Post-LeadVesselPressure 12psi
Skid1EffluentPressure 2.0psi
Skid2Post-LeadVesselPressure 12psi
Skid2EffluentPressure 2.0psi
Skid3Post-LeadVesselPressure 11psi
Skid3EffluentPressure 1.5psi
Notes:
psi=poundspersquareinch
gpm=gallonsperminute
Deleted: PUMP
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RID-92
ParameterNormal
OperatingValue
WellheadPressure(Bypass) 0.5psi
WellheadPressure(Treatment) 21psi
FlowRate(Bypass) 1,400gpm
FlowRate(Treatment) 1,100-1,200gpm
Skid1Post-LeadVesselPressure 2.0psi
Skid1EffluentPressure 1.0psi
RID-95
ParameterNormal
OperatingValue
WellheadPressure(Bypass) 1.0psi
WellheadPressure(Treatment) 12.5psi
FlowRate(Bypass) 1,750gpm
FlowRate(Treatment) 1,500-1,600gpm
Skid1Post-LeadVesselPressure 5.0psi
Skid1EffluentPressure 2.0psi
Skid2Post-LeadVesselPressure 7.0psi
Skid2EffluentPressure 2.0psi
RID-114
ParameterNormal
OperatingValue
WellheadPressure(Bypass) 0.5psi
WellheadPressure(Treatment) 11.5psi
FlowRate(Bypass) 2,400gpm
FlowRate(Treatment) 2,100-2,300gpm
Skid1Post-LeadVesselPressure 7.0psi
Skid1EffluentPressure 2.0psi
Skid2Post-LeadVesselPressure 7.0psi
Skid2EffluentPressure 3.0psi
Skid3Post-LeadVesselPressure 6.0psi
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Skid3EffluentPressure 2.5psi
4.3 LGACTREATMENTSKIDS
The wellhead treatment systems consist of Siemens HP-1220 LGAC treatment skids, each
capableoftreatinganominalflowof1,100gpmofwaterinseries(lead-lag)configuration.The
numbersofskidsateachwellsitecurrentlyinclude:RID-89(3),RID-92(1),RID-95(2)andRID-
114(3),foratotalof9skids.
TheLGACtreatmentskidsincludethefollowingstandarddesignfeatures:
• Down-flowconfigurationtofacilitatebackwash;
• Integratedpiping(8-inchschedule40carbonsteel)withcastirongear/wheelbutterfly
valveswithEPDMseats,configuredtoallowseries,parallelorvessel-isolationflow;
• Systemsoperateutilizingexistingwellequipmenttopumptheimpactedgroundwater
throughtheLGACvesselsfortreatmentandperiodicbackwash;
• Equippedwithsampleportsattheskidinfluent,25%,50%and75%ofGACbeddepth,
andvesseleffluenttoenablemonitoringofmasstransferzoneandbreakthrough;
• 20,000poundcarboncapacityineachcarbonsteelvessel(7,520gallonvolume);
• Operating flow rate of 1,100/2,200 gpm (series/parallel) per skid and 1,000 gpm
backwash flow rate (higher flow rates can be achieved but empty bed contact time
woulddecreaseproportionally);
• IntegratedGACtransferpiping(4-inchSchedule10304Lstainlesssteel);and,
• Vessels and piping are rated to 125 psi and burst discs are integral to the piping to
safelyreleaseanddivertwaterintheeventofover-pressure.
During2013and2014,criticalmaintenanceworkwasneededatall four (4)currentwellhead
treatment systems (i.e., all 18 vessels) to replace corroded piping (4-inch, Schedule 10 304L
stainlesssteelGACfillandremovallines),whichwerecoveredunderwarranty.Similardefects
havebeenobservedontheSiemensGACequipmentinstalledattheNorthIndianBendWash
federalSuperfundSite.EachpipewasremovedandreplacedbySiemens’(nowEvoquaWater
Technologies)contractorSmythIndustries,ofTucson,ArizonawiththeGACfill linesprimarily
replacedin2013andtheGACremovallinesreplacedon10of18vesselsduringcarbonchange-
out activities from June through October 2014. The remaining GAC removal lines will be
replacedwhencarbonchange-outactivitiesareneededonthe8currentlyremainingvessels.
4.4 SYSTEMOPERATION
General system operation for each LGAC skid includes operation in treatmentmode, bypass
mode,andamodifiedtreatmentmodetofacilitateLGACchange-outsand/orbackwash.Each
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skidisconfiguredforseries(orlead-lag)operationfornormaltreatmentmode,butarecapable
ofparallelorsinglevesseloperation,asnecessary,tofacilitatemaintenanceactivities.
Operationalperformancedatawillbecontinuouslymonitoredandcollectedonamonthlybasis
using the instrumentation and supervisory control and data acquisition (SCADA) system
describedinSection4.5.6.
AnOperation&MaintenanceManual(preparedbySiemens)forthepre-engineeredLGACskids
is included asAppendix E, and provides equipment details/specifications including: standard
procedures to operate the treatment skids (i.e., start-up, carbon changes, backwashing),
troubleshooting,systemmonitoring,shutdownandemergencyprocedures,maintenance, lists
ofscheduledmaterials (withpartnumbers)onthedrawings inSection8.0,andspecifications
for the vessels (i.e., drain system, valves, burst disks, spray nozzles, pressure gauges, and
interior/exterior coatings). Although the Operation & Maintenance Manual specifically
identifies“WellSite95”, thesameManual isapplicable to theequipmentandoperations for
the other three (3) current wellhead treatment systems (RID-89, RID-92 and RID-114).
Therefore,onlyoneManualisincludedaspartofthisO&MPlan.
A flow diagram and valve sequence chart are also included in the Siemens Operation &
MaintenanceManualandonFigures3-6.EachvalveassociatedwiththeHP-1220systemshas
beenclearlylabeledinthefieldtohelptheOperatorwhenmakingchangestotheoperationof
thetreatmentsystems.
4.4.1 TreatmentModeEach LGAC skid is operated in conjunction with RID’s pumping schedule with cessation of
treatment during well maintenance activities, treatment system maintenance activities
(requiring system shut-down), lack of adequate funds from third parties or cost recovery
actionsorunanticipatedfailures(includingbutnotlimitedto:poweroutages,criticalalarms,or
equipmentmalfunctions).
4.4.2 BypassMode
Shoulditbecomenecessarytoshutoffanyofthetreatmenttrains,andRIDrequirestheflow
fromthatwell, theuntreatedflowmaybetemporarilybypassed(inpartor inwhole)around
thetreatmentsystemanddischargeddirectlyintotheexistingreceiverboxuntiltreatmentcan
resume(utilizingthe3-wayvalve,seeSection4.5.4).
The notification procedure in Section 4.1 shall be followed if a treatment system is changed
from treatment mode to bypass mode (full bypass) due to a system upset event. Other
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operational changes that require partial bypass, including carbon change-out activities or
changesinRID’swaterdemandthatrequirefullbypass,forexample,willbedocumentedinthe
MonthlyProgressReports(Section6.2).
ThereisaroutineoccurrencewhenoperationinpartialbypassmodeisnecessaryattheRID-92
wellheadtreatmentsystem.SincethereisonlyonetreatmentskidatRID-92,partialbypassis
necessary during carbon change out activities to fluidize the GAC for removal and refilling
activities,andbackwashing.Partialbypassisnecessaryinthiscasetopreventexcessivelyhigh
flowrateduringbackwash,whichcouldresultinpossiblelossofGAC.Sinceallothertreatment
systems utilize two or three treatment skids, this mode of routine partial bypass is only
necessaryattheRID-92wellheadtreatmentsystem.
Duringfullorpartialbypassoperation,theSCADAsystemisstillfunctioningandthechangein
flowpathisshownonthecontrolscreensandcapturedbydataacquisition.Whenthisoccurs,
thewellhead pressurewill decrease and flowswill increase (due to reduced pressure head).
Duringfullbypassmodeoperation,pressuredifferentialacrosstheleadandlagvesselsgoesto
zero,andtherefore,noalarmsaretriggered.
4.4.3 LGACChange-OutsandBackwash
LGACbed lifewillbeassessed/monitored ineach treatmentsystembysamplingandanalysis
for targetCOCsasdescribed in Section4.6. Carbonchange-outswill be scheduledbasedon
COC concentrations as determined in weekly water quality analytical results. Trigger levels
havebeenestablishedbasedonthebreakthroughperformancefromthelastseveralyearsof
treatment systemoperation at each of the four (4) current treatment systems, as described
below.
Eachofthefourtreatmentsystemshasauniquebreakthroughprofilethatisdependantonthe
mixtureandrelativeconcentrationsoftheCOC’saswellastheflowratethrougheachsystem.
BreakthroughcurvesatRID-89andRID-114treatmentsystemsareverysimilar,however,due
tothefactthatbothhaverelativelylowconcentrationsof1,1-DCEinthepumpedgroundwater
(less than3µg/L). Breakthroughcurvesarealsosimilar for treatmentsystemsatRID-92and
RID-95wherepumpedgroundwatercontainshigherconcentrationsof1,1-DCE,between6and
8µg/L.
TheMCL (and treatmentgoal) for1,1-DCE is7µg/L; therefore,exceedanceof this treatment
goalatRID-89orRID-114isextremelyunlikelywithsuchlowinfluentconcentrations.Thereis
thepotential,however,forexceedanceofthistreatmentgoalatRID-92andRID-95.Therefore,
twosetsoftriggerlevelshavebeenestablished.
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Trigger levels formanagingGAC replacements includeboth“alert” levelsand“action” levels.
Alertlevelsareinplacetopromptaheightenedawarenessandreviewofthewaterqualitydata
trends to ensure that no significant changes have occurred (e.g. abrupt rise in influent
concentration)and toprovideadvancedconsideration inchange-outplanning. Action levels
areinplacetotriggermandatoryinitiationofGACchange-out.
These trigger levels apply to the COC concentrations noted in the water quality analytical
resultsforthesamplesspecifiedasfollows:
RID-89andRID-114
AlertLevel: 3.0µg/L 1,1-DCE InfluentSample
4.0µg/L 1,1-DCE PointofCompliance
ActionLevel: 2.5µg/L TCEorPCE PointofCompliance(1/2MCL)
6.5µg/L 1,1-DCE PointofCompliance
RID-92andRID-95
AlertLevel: 1.5µg/L TCEorPCE PointofCompliance
2.5µg/L 1,1-DCE PointofCompliance
ActionLevel: 2.5µg/L TCEorPCE PointofCompliance(1/2MCL)
3.5µg/L 1,1-DCE PointofCompliance(1/2MCL)
Again, “alert levels” are established as an early warning indicator whereas “action levels”
triggermandatory initiationofGACchange-out. GACmaybe replacedprior toexceedingan
action level, however, at the discretion of the operator for reasons such as to facilitate
scheduled or unscheduled maintenance or in preparation for an extended shutdown
(particularlywiththosebedsnearexhaustion).
A carbon change-out with reactivated GAC will be scheduled according to the conditions
prescribed. When such a condition is observed, the lead vessel of the skidwith thehighest
targetCOCconcentration intheMid-Skidsamplewillbescheduledfor thechange-outunless
thechange-outisinitiatedtofacilitatemaintenanceonadifferentvessel2.
Duringeachcarbonchange-out,thelagvesselwillbereconfiguredasleadandthespentGAC
removedfromtheexhaustedvesselandreplacedwithfreshreactivatedGAC.Duringremoval
2 Currently, the RID-92 wellhead treatment system only has a single skid.
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and replacement of the spent GAC from the exhausted vessel, the remaining vessel will
continuetotreattheflowonastand-alonebasis(i.e.,singlepass).Insomeinstances,itmaybe
necessary to isolate an entire skid and/or switch to partial or full bypass to facilitate
maintenanceactivities.
Following recharging of the exhausted vessel, the recharged vessel will be backwashed to
remove fines, left to soak for approximately24hours to removeentrainedair, andputback
intoserviceasthe lagvesselandremain inthatconfigurationuntil the leadvessel requiresa
carbonchange-out. Backwashwillbeconductedataflowofapproximately1,000gpm(using
treatedwater conveyed from the new lead vesselwhile operating in stand-alone basis) and
backwashwaterwillbedivertedfromthebackwashedvesseldirectlytothedischargereceiver
box.
Basedoncarbonchange-outfrequenciesforeachofthecurrentwellheadtreatmentsystems3
todate,theestimatedchange-outschedulepervesselateachsiteisincludedbelow:
• RID-89:4-5monthsofoperation
• RID-92:2-3monthsofoperation
• RID-95:2-3monthsofoperation
• RID-114:5-6monthsofoperation
4.5 INSTRUMENTATIONANDCONTROLS
The wellhead treatment systems are equipped with instrumentation and controls (I&C),
designed and integrated by Vertech, that provide real-time monitoring of key performance
parameters of system operation. The I&C also enables remote operation andmonitoring of
system operations and provides alarm notification for key process and control parameters.
Control System record drawings for the currentwellhead treatment systems are included in
AppendixA(RID-89),AppendixB(RID-92),AppendixC(RID-95),andAppendixD(RID-114).
Instrumentationisincludedtomonitor:
• Wellpumprunstatus;
• Welldischargeandbypassflowrates(instantaneousandtotalized);
• Flowtoeachtreatmentskid(instantaneousandtotalized);
• Wellheadpressure;and,
• Differentialpressureacrosseachtreatmentskid.
Controls/alarmsareincludedfor:
3 These systems currently only operate 7-8 months per year based on RID’s historical operations.
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• Pumpstart/stop;
• Bypassflow;
• Lowflowateachtreatmentskid;and,
• Waterlevelinsumpsandsumppumpstart/stop.
These I&C nodes are integrated into a SCADA system that allows for remote control of the
systems as well as continuous monitoring capabilities and data storage to document key
aspects of treatment system operations and demonstrate the level of reliability required to
ensurethesuccessfulremediationofthegroundwatersupply(i.e.,toachieveTreatmentGoals)
andtheprotectionofpublichealth.
ThefollowingsectionsdescribethevariousI&Ccomponents,includingO&Mrequirementsfor
each.EquipmentmanualsforeachcomponentareincludedinAppendixF.
4.5.1 WellPumpsThe well pumps for the wellhead treatment systems convey groundwater through the
treatment skids (treatmentmode) or directly to the discharge structure (bypassmode). The
pumpscanbecontrolledmanuallyfromthelocalOperatorInterfaceTerminal(OIT),mounted
tothefrontoftheRemoteTerminalUnit(RTU)controlpanel,oroperatedremotelyfromthe
OIT in thecontrol roomatRID-95 (orvia remoteconnectiontotheOIT in thecontrol room).
TheOITinthecontrolroomcancontroloperationsforallfour(4)currentwellheadtreatment
systems.
SystemStart-UpandShutDownProcedures
Prior to start-up of each wellhead treatment system, the Operator shall inspect the system
components for potential problems (including water accumulation in the containment area
sump[s]),inspectpipingforsignsofleaks,verifyallcontrolandisolationvalvesarepositioned
properly,andacknowledge/clearanyalarmsontheOITs.TheOperatorwillchecktoseeifthe
pumpswitchateachsiteisin“Auto”modeinsidethemotorcontrolcenter(MCC)cabinet.
• Wellpumpsarestartedmanuallybypressingthe“MainPumpStart”pushbuttononthe
localOITortheOITlocatedinthecontrolroom(orviaremoteconnectiontotheOITin
thecontrolroom).
• Followingstart-up,theOperatorwillmonitorthetreatmentsystemsforaminimumof
15minutestoverifyproperoperation.
• Each well pump will run continuously until manually stopped by pressing the “Main
PumpStop”pushbuttononthelocalOITorattheOITlocatedinthecontrolroom(or
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via remote connection to the OIT in the control room). Well pumps can also be
manually stopped by switching from Auto to OFF using the local controls in the
switchgearcabinetadjacenttothewell.
ShutDownConditions
• Eachwellpumpwillstopautomaticallyintheeventofamotoroverloadcondition.The
pumpwillneedtoberestartedmanuallyattheMCCcabinetaftertheoverloadrelayfor
thepumpmotorstarterisreset.
• Intheeventofapowerfailure/outagewhilethepumpisrunning(seeSection4.5.9),the
pumpwillattempttorestartonetime. If theattempt fails, thepumpwillneedtobe
restartedmanually at the localOIT or remotely at the control room after the SCADA
computerisrestarted.
• In the event of an overload conditionwith the pumpmotor starter, an alarmwill be
displayedontheOITatthelocalcontrolpanelandattheOITinthecontrolroom,and
theOperatorwillbenotified.• Intheeventofalow-lowflowratecriticalalarmatatreatmentskid,theOperatorwill
benotified and thewell pumpwill automatically shut off at that site. For this critical
alarm, theOperatorwill follow the systemupset notifications proceduredescribed in
Section4.1.
• When water (e.g., rain water or process water) accumulates in a sump, a high-level
switchalarmwill resultwhenwater reaches the first floatalarmpoint. TheOperator
will benotified and the sumppump(s)will start automatically to discharge thewater
until thewater leveldropstobelowthefirstfloatalarmpoint. Iftheaccumulationof
water reaches the second float alarm point, a high-high critical alarm will result in
anothernotificationtotheOperator,andthewellpumpwillautomaticallyshutoff.For
this critical alarm, the Operator will follow the system upset notifications procedure
describedinSection4.1.
4.5.2 FlowMeters
Manufacturer/Model Size
Sensor/TransmitterType
Siemens,SitransFMMagflo® 8”&14” MAG5100W/MAG5000
• 8-inch flow meters installed one per treatment skid to measure instantaneous and
totalizedflowofrawgroundwater(i.e.,influent).
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• 14-inchflowmetersinstalledoneperwellsiteonthebypasspiping.AtRID-89,RID-92
andRID-114,theflowmetermeasureswelldischargeflowinbothtreatmentandbypass
modes (instantaneous and totalized values). At RID-95, the 14-inch flowmeter only
measures bypass flow (instantaneous and totalized) due to operational/mechanical
constraints within the treatment system concrete pad. Treatment flow at RID-95 is
measuredbythetwo8-inchflowmeters,whicharecombinedtoderivethetotalwell
dischargeflowrate.
• If a treatment skid flow rate at a site falls below the low-low flow rate critical alarm
value,(summarizedinSection4.5.6),theOperatorwillbenotifiedandthewellpumpat
thatsitewillautomaticallyshutoff.
4.5.3 PressureTransmitters
Manufacturer/Model Range OrderNo.
Siemens,SitransP200 0-200psig 7MF1565-4CB
• Ateachsite,onepressuretransmitterislocatedupstreamofthe3-wayvalvetomonitor
wellheadpressure(seeFigures3-6).
• At each site, one pressure transmitter is located on the effluent piping of each
treatmentskidtomonitoreffluentwaterpressureanddifferentialpressureacrossthe
vessels (see Figures 3-6). If the differential pressure (calculated from the values
measuredatthetransmitterlocatedimmediatelydownstreamofthewellheadandthe
transmitter at the effluent piping of each treatment skid) increases to the high
differentialpressurevalueof25psi(whichcouldindicatesoliddepositsaccumulatingin
thecarbonbed, forexample),analarmwillbedisplayedontheOITandtheOperator
willbenotified.Thisisnotacriticalalarm,andtherefore,willnotautomaticallyshutoff
thewellpump.
4.5.4 3-WayValves
Manufacturer/Model #ofPositions Power
VSI,Series1000ElectricActuator[1200] 2(on/off) AC120V/240VAC24
• Eachwellhead treatment system includes one (1) 3-way valve that can be controlled
manuallyatthevalve(usinganAllenhandleatthemanualoverridelocation),orusing
the electric actuator through the local OIT mounted to the front of the RTU control
panelateachsite,orremotelyfromtheOITinthecentralcontrolroom(orviaremote
connectiontotheOITinthecontrolroom).Innormaloperation,thevalvewillbeclosed
onthebypasspipingandopenontheinfluentpipingtoeachtreatmentskid.
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• To preventwater hammer, power-assisted closing/opening of valve is paced to occur
over a 120-second period (i.e., over 2X safety factor based on the manufacturer’s
specifications)whenchangingfromnormaloperationtobypassmode,or frombypass
modetonormaloperation.
• For temporary changes in flow between treatment and bypass, the Operator may
manuallyopen/closethebypassvalveuntilthedesiredflowratesareobtained(usingan
Allen handle at the manual override location). The manual opening/closing of the
bypassvalveisconductedatacontrolledratetopreventwaterhammer.4.5.5 SumpsandLevelSwitches
Manufacturer/Model #ofFloats OrderNo./SwitchType
Dwyer,MercoidSeriesFSW2Free-
FloatingLevelSwitch
2(high/high-high) FSW2-ONPN-20/SPSTNO
FSW2-CNPN-20/SPSTNC
• Theconcretepadsateachsiteareconstructedwithapproximate6-inchbermsalongthe
pad perimeter to contain and prevent release of water and the pads slope slightly
towards the collection sump(s) to facilitate collection and detection of any incidental
rainfallorsystemleakage.
• Thewellhead treatment systemsatRID-92andRID-95eachhaveonesumpequipped
withtwo(2)levelsensors/switches.
• The RID-89 and RID-114 wellhead treatment systems each have two sumps, both
equippedwithtwo(2)levelsensors/switchesthatoperateindependently.
• Eachsump iscoveredbyagrateconforming toMaricopaAssociationofGovernments
(MAG)detail539.
• TheOperatorwill inspecteachsumponaweeklybasis for theaccumulationofwater
andifpresent,willdeterminethesource.
• Whenwater(e.g.,rainwaterorprocesswaterfromsamplingormaintenanceactivities)
accumulatesinasump,ahigh-levelswitchalarmwillresultwhenwaterreachesthefirst
float alarm point. The Operator will be notified and the sump pump(s) will start
automaticallytodischargethewateruntilthewaterleveldropstobelowthefirstfloat
alarmpoint.Iftheaccumulationofwaterreachesthesecondfloatalarmpoint,ahigh-
highcriticalalarmwillresultinanothernotificationtotheOperator,andthewellpump
willautomaticallyshutoff. For thiscriticalalarm, theOperatorwill followthesystem
upsetnotificationsproceduredescribedinSection4.1.
• The water contained in the sump will be discharged via 1 ½” to 2” galvanized steel
pipingbya¾horsepowerpump(ratedfor50gpm)tothedischargestructure/receiver
boxatthewellsite.
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4.5.6 SCADASystem
Each wellhead treatment system site is equipped with a wireless transceiver that allows
communicationwiththecontrolroomatRID-95,whichservesasthecentralhubfortheSCADA
system. Screen shots of the SCADA system are included inAppendixG. A summary of the
SCADAsystemalarmconditions is includedbelow. The low-lowflowratecriticalalarmvalue
for each skid is calculated as 75% of the flow rate from thewell divided by the number of
treatment skids for that site. TheOperatorwill benotified for eachalarmcondition. Other
criticalandnon-criticalconditionsareasdescribedinprevioussections.
Condition AlarmValue
RID-89Low-LowFlowRate-3TreatmentSkids(Critical)
RID-92Low-LowFlowRate-1TreatmentSkid(Critical)
RID-95Low-LowFlowRate-2TreatmentSkids(Critical)
RID-114Low-LowFlowRate-3TreatmentSkids(Critical)
75%ofthewellflow
ratedividedbythe
numberof
treatmentskids
TreatmentSkidDifferentialPressure(Non-Critical) 25psi
HighLevelinSump(Non-Critical) Firstfloat
High-HighLevelinSump(Critical) Secondfloat
HighTemperature(Non-Critical) 120°F
4.5.7 TemperatureSensors
Manufacturer/Model ProductNo.
Siemens,4-20mARoom
TemperatureSensor
536-753
(20to120°F)
• Temperaturesensorsareinstalledatallthewellheadtreatmentsystems.
• Thesensorsmonitorthecabinettemperaturecontainingthecontrolhardwareandthe
temperature inside of the RID-95 control room. If the alarm value 120 degrees
Fahrenheit (°F) is exceeded, the Operator will be notified, but no change in the
operationalstatusofthesystemwilloccur.
4.5.8 SiteSecurity
Sitesecurityateachwellheadtreatmentsystemsiteincludes:
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• Newlightingfixturesthatcomplywithlocalnightskyordinance.
• New wrought-iron fencing and access gates set-up with electronic sensing alarms
(exceptatRID-92).
• Keysforthelocksateachwellsiteaccessgatewillbeprovidedtoapproved/authorized
personnelonly(Note:somelocksaredaisy-chainedtoallowaccessbySaltRiverProject
personneltoreadtheelectricalmeters).
• Secureaccesstoelectricalequipment.
• Cameras for 24-hour site surveillance. Cameras can be remotely operated (including
pan/zoomcapability)ontheSCADAcomputertoassisttheOperatorinrapidassessment
ofsystemconditions.
4.5.9 SystemOperationUpsetEventsAn unscheduled shutdown of the wellhead treatment systems may occur due to various
reasons,whichinclude(butarenotlimitedto)thefollowing:
• Power Outage – power supply outages may occur as a result of lightning storms,
downedpowerlines,downtransformer,etc.Ifanyofthetreatmentsystemshavealoss
ofpower,thesystemwillautomaticallyrestartthewellpumponetime,inbypassmode.
Intheeventofapoweroutage,aback-uppowersupplywillallowfortheSCADAsystem
toremainoperational,andtheOperatorwillbenotifiedofthealarm.TheOperatorwill
need to physically visit the treatment system to inspect the cause of the alarm,
coordinaterestorationofpowersupplyatthesite,andrestartthetreatmentsystem.
• Heavy Rain – as indicated in Section 4.5.5, each sump is equipped with a two-level
sensor/switch.Intheeventthataheavyrainstormcausesaccumulationofrainwaterin
asumptoreachthesecondfloat(triggeringahigh-highcriticalalarm),theOperatorwill
benotifiedandthewellpumpwillautomaticallyshutoff.
• CriticalAlarms–thereareanumberofalarmconditions(summarizedinSection4.5.6),
thatwhentriggered,willresultinanautomaticnotificationtotheOperator.However,
twotypesofcriticalalarms(i.e., low-lowflowrateforeachtreatmentskidandahigh-
highlevelinasump),willautomaticallyshutoffthewellpump.
Please refer to Section 4.1 for notification procedures for wellhead treatment system upset
events.
4.6 SAMPLINGANDANALYSIS
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Thissectionprovidesthemethodsandprocedurestocollectandanalyzewellheadtreatment
systemsamples.
4.6.1 PurposeofSamplingandAnalysisProgram
Thegoalofthesamplingandanalysisprogramistocollectdatato:
• DeterminecompliancewiththewaterqualityTreatmentGoalsforthetargetCOCs;
• Determine when LGAC bed breakthrough/exhaustion occurs and LGAC change-out is
needed;and,
• Determine the approximate mass of target COCs being removed at each wellhead
treatmentsystem.
4.6.2 FrequencyandLocationsofSampling
The proposed data collection/sampling programs are presented in the matrix below. The
location and frequency of each sample will be conducted for each of the individual LGAC
treatmentskids.Samplingfrequencyandlocationsreferonlytothe“lead”vesselexceptwhere
noted.
WellheadTreatmentSystemSamplingProgramMatrix
LOCATION FREQUENCY
WeeklyInfluentSample
Port@Wellhead Monthly*
WeeklyMid-Skid
SamplePortMonthly*
Pointof
Compliance(POC)Weekly
Theasterisknexttoeach“Monthly”indicatesthatachangetothisfrequencywillbebasedon
an evaluation of “Weekly” data and may be changed after the treatment system reaches
steady-state (if agreed to in advance by ADEQ). Sampling will revert to “Weekly” should
significantvariationorunanticipatedresultsbeobserved.
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The POC sample ports (installed at the 14-inch discharge piping, located downstreamof the
treatment skidsand immediatelyupstreamofeach receiverbox, seeFigures3-6)will be the
location for demonstrating that the treatment system achieves the Treatment Goals for the
target COCs described in Section 2.4. Field quality control (QC) sampleswill be collected as
describedinSection4.6.4.
4.6.3 SamplingMethods
Thefollowingsectionprovidesdetailsregardingthemethodsthatwillbeusedforthewellhead
treatment system sampling program. Sampling will be conducted consistent with the
provisionsoftheHealthandSafetyPlan,includedasAppendixH.
SamplingEquipment&Procedure
Priortosamplecollection,eachsamplingportwillbepurgedforapproximately15-30seconds
toremoveanystagnantwater(i.e.,non-representativewater).Purgewaterfromtheinfluent
and effluent sample ports will be collected in a two (2) gallon bucket, andwill be disposed
withinthetreatmentsystemconcretecontainmentstructure.
Each water quality sample will be collected in a set of two (2) 40-milliliter volatile organic
analysis (VOA)vialspreservedwith1:1hydrochloricacid (HCl).Sampleswillbecollectedwith
zeroheadspace.EachVOAvialwillbetiltedtoapproximately45degreesofvertical,andfilled
usingalowflowrate(i.e.,approximately250millilitersperminuteofsample).Thevialwillbe
filledtothebrimandthen,usingthecap,asmallamountofwatershallbeaddeduntilaconvex
meniscusisformed.Thevialwillthenbecapped,turnedupsidedown,andtappedtoverifyno
headspace. Sampleswillbestoredinacoolerwithwet iceat4°Celsius(C),±2°C,andhanddeliveredtotheanalyticallaboratory.
4.6.4 AnalyticalMethodsandProcedures
Sampleswill be analyzed followingprotocols that includequality control (QC)provisions and
sampledocumentationandmanagementpracticesasdescribedinthefollowingsections.
SampleAnalyses
Water samples will be analyzed for VOCs following EPA Method 8260B and submitted to
AirtechEnvironmentalLaboratories(AEL)ofPhoenix,Arizona.AELisanenvironmentaltesting
laboratory certified by ADHS under license number AZ0740. AELwill analyze for the six (6)
WVBASiteCOCs.ThereportinglimitforeachCOCwillbe0.5microgramsperliter.
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DataqualitycontrolpracticeswillbeinaccordancewiththeAELstandardoperatingprocedure
(SOP) for analysis of VOCs by EPA Method 8260B (Appendix I). Standard quality control
requires analysis of a Laboratory Control Sample (LCS), LCS duplicate, internal standard, and
surrogateanalyteswitheachsampleset.The8260Bmethodrequiresanalyticalaccuracytofall
within a series of ranges of percent recoveries for internal standards and surrogates (see
AppendixI).Laboratoryduplicatesmustbelessthanorequalto20relativepercentdifference
(RPD). Dataquality controloutsideof these limitswillbe re-run ifpossible,orappropriately
flaggedwiththereportedresults.
QualityControl
Qualitycontrolmeasureswillbeemployedtoevaluateboththefieldsamplingproceduresand
techniquesaswellasthelaboratoryproceduresandperformanceofinstrumentation.
FieldQCsamples (includingtripblanksandfieldduplicates)willbecollectedtohelpevaluate
conditions resulting from field conditions and activities. Field QC samples may be used to
evaluatevariabilityinenvironmentalsamplingandanalysisoforganiccontaminants.
Fieldduplicatesampleswillbecollectedandtreatedindependentlyofitscounterpartinordertoassessfieldsamplingproceduresandlaboratoryprecisionandaccuracy,throughcomparison
oftheresults,andcollectedatafrequencyofone(1)persamplingevent. Duplicatesamples
will be preserved, packaged, and sealed in the same manner as the primary samples. A
separate sample number and identification will be assigned to the duplicate, and it will be
submitted blind to the laboratory. Identity of the duplicate samplewill be recorded on the
WeeklyOperationandMaintenanceInspectionForm(AppendixJ).
Trip blank samples are used to determine if VOC water samples have been contaminated
duringtransport fromthe field to the lab. Thetripblanksarepreparedbythe laboratoryby
fillingaVOAvialhead-space freewithorganic freewater,preservedwith1:1HCl, labeledas
“TripBlank”or“TB”withthepreparationdateincludedonthecustodyseal.Tripblankswillbe
includedineachcoolerusedtotransportwatersamplestothelaboratory.Theresultsofthe
trip blanks are a key aspect of the overallQC system for the sampling program, andwill be
includedintheanalyticalresultsreport.
Laboratory quality control samples are certified standards analyzed by the laboratory(includingmatrixspikesamplesandduplicates)todemonstrateaccuracyonadailybasis.Since
samples to be used as matrix spikes are randomly selected by the laboratory analyst after
receiptofsamples, it isunderstoodthatsuchanalysesmayormaynot includesamples from
anygivensamplingeventorlocation.
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Laboratoryprocedureswillbeevaluatedusingfieldduplicatesamples,matrixspikesandother
internalproceduresdefinedbytheanalyticalmethodandanalyticallaboratory.
SampleDocumentationandManagement
Chain-of-custodyrecordsarecompletedforeachsamplingevent.Thechain-of-custodyrecord
will be completed as samples are collected. An example chain-of-custody record for AEL is
providedasAppendixKandwillaccompanythesamplestothelaboratory.Informationtobe
enteredoneachchain-of-custodyrecordincludes:
• Projectname
• Projectmanager/contactperson
• Printednameofsamplerandsignature
• Dateandtimeofcollection
• Samplematrixidentification
• Numberofcontainerscollectedforeachsample
• Sampleidentification
• Analysesrequested
• Turn-around-timerequested
• Datesofpossession
• Nameandsignatureofpersonrelinquishingsamples
• Dateofsamplereceipt
• Timeofsamplereceipt
• Nameandsignatureofpersonreceivingthesamples
• Remarkspertinenttosamplecollection,preparation,preservation,andanalyses
Samples will be submitted as soon as possible (i.e., on the date of sampling) to AEL with
requested turnaround time of five (5) days and VOC analyses following EPAMethod 8260B,
whichhasaholdtimeof14days.
All documentationwill bemade in indelible ink. Correctionswill bemadebydrawing a line
through the error and entering the correct information. Both the error and the correct
informationmustbelegible.Thepersonmakingthecorrectionwillinitialthedocumentwhere
changesaremade.
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5.0 SPENTGACMANAGEMENT
Foreachwellheadtreatmentsystemsite,spentGACmustcurrentlybeprofiledeverytwoyears
by the carbon vendor. Synergy will coordinate the profiling process, contacting the carbon
vendor a minimum of six weeks prior to an anticipated carbon change-out so that a grab
sampleofspentGACcanbecollectedandanalyzed.Thegrabsampleshallbecollectedbythe
carbon vendor using a 16-ounce glass jar (or similar) by accessing the 14-inch by 18-inch
elliptical man-way located at the top of each vessel (see Section 8.0 of the Siemens O&M
Manual inAppendixE).Followingsatisfactorycompletionof theprofilingprocess, spentGAC
canberemovedandtransportedoff-sitetoareactivationfacilityprovidedtheprofileindicates
theGACasnon-hazardous.AllhistoricalprofileshaveindicatedspentGACfromthewellhead
treatment systems were non-hazardous. All profile records will be maintained in the Field
OfficeatRID-95.
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6.0 DOCUMENTATIONANDREPORTING
Thissectionincludestheongoing,periodicdocumentationandreportingnecessaryforeffective
monitoringofthewellheadtreatmentsystems.
6.1 WEEKLYINSPECTIONFORMS
Inspections will be conducted once per week to monitor the operational and physical
conditions at each wellhead treatment system. A blank inspection form is included as
AppendixJ,andprovidesforcollectingdatarelatedtowaterflowrates;operatingpressuresat
the wellhead and across the treatment vessels, alarms, and equipment inspections and
maintenance/repairs. The Operator will complete the form during each inspection. All
inspection data and information will then be uploaded to the operations database for the
wellhead treatment systems. The inspection formwill be reviewedannually (at aminimum)
andupdatedasappropriate.
6.2 MONTHLYPROGRESSREPORTING
For eachmonth that the wellhead treatment systems are in operation, aMonthly Progress
Report will be prepared to document remedy progress. RID will provide ADEQ’s Remedial
ProjectsUnitwithone(1)hardcopyandone(1)electroniccopyofeachReportbythe15thof
themonththatfollowsthereportingperiod.AnexampleofatypicalMonthlyProgressReport
(excluding copies of the final laboratory reports) is provided asAppendix L. EachMonthly
ProgressReportwillincludethefollowing,ataminimum:
• ApproximatemassoftargetCOCsremovedandgroundwatervolumetreatedduring
thereportingperiod,andcumulativetotaloftargetCOCsremovedandgroundwater
volume treated since system start-up for each treatment system and total for all
sites;
• Tabular summary of wellhead treatment system samples collected and analytical
resultsforthereportingperiod;
• Copiesoffinallaboratoryreportsforthereportingperiod;
• Operational hours/percentage for each wellhead treatment system during the
reportingperiod;
• Datesofcarbonchange-outsconductedduringthereportingperiod;
• Summaryofanymalfunctionswhichcausedthewellheadtreatmentsystemstobe
offlineduringthereportingperiod;
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• Summary of the maintenance activities performed to correct those malfunctions
duringthereportingperiod;
• Summary of system operation upset events (see Section 4.1) reported to ADEQ
duringthereportingperiod;and,
• Copiesoftheweeklyinspectionformsduringthereportingperiod.
Themost recentMonthlyProgressReports (withoutvoluminousanalytical laboratory results)
are available on the West Valley Groundwater Cleanup Coalition website
(http://www.wvgroundwater.org),underthe“ProjectDocuments”tab.
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7.0 KEYCONTACTSLIST
Keycontactsforthewellheadtreatmentsystemsinclude:
RooseveltIrrigationDistrict–
DonovanNeese,PE KenCraig
Superintendent WaterOperationsManager
Email:[email protected] Email:[email protected]
Phone:(623)670-4760 Phone:(623)695-5855
AgencyOversight–
ScottGreen
ArizonaDepartmentofEnvironmentalQuality
Email:[email protected]
Phone:(602)771-1612
Engineering/TechnicalSupport–ComplianceCoordinator
JoelPeterson,PE
SynergyEnvironmental,LLC
Email:[email protected]
Phone:(480)284-3518
Deleted: WellheadTreatmentSystems
Owner/Operator–
JimMadole,PE TerryBlood
President Operator
SpinnakerHoldings,LLC Spinnaker
Holdings,LLC
Email:[email protected] Email:
Phone:(602)810-2105 Phone:(480)
231-6509
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8.0 REFERENCESCITED
ArizonaDepartmentofEnvironmentalQuality(ADEQ),2010.ConditionalApprovalofaWater
QualityAssuranceFund(WQARF)EarlyResponseAction(ERA)WorkPlanfortheWest
VanBurenRegistrySite,June24.
__________, 2011. Reviewof RID-95WellheadPilot Treatment SystemProposalWork Plan,
WestVanBurenWaterQualityAssuranceRevolvingFundRegistrySite,September2.
__________,2013. ConditionalApprovalofRID’sModifiedEarlyResponseActionWorkPlan,
WestVanBurenWQARFRegistrySite,Phoenix,Arizona,February1.
__________,2015.DraftFeasibilityStudy–RooseveltIrrigationDistrict,April13.
Environmental Protection Agency, 2016. EJSCREEN: Environmental Justice Screening and
MappingTool(availableatwww.epa.gov/ejscreen).
Montgomery & Associates, 2010. Work Plan, Roosevelt Irrigation District Early Response
Action,WestVanBurenWaterQualityAssuranceRevolvingFundSite,February3.
SynergyEnvironmental,2011a.EarlyResponseAction-PublicHealthExposureAssessmentand
MitigationWork Plan,WestVanBurenAreaWaterQualityAssuranceRevolving Fund
Site,June16.
__________,2011b.EarlyResponseAction-PublicHealthExposureAssessmentandMitigation
SummaryReport,WestVanBurenAreaWaterQualityAssuranceRevolvingFundSite,
September16.
__________,2011c.RID-95WellheadPilotTreatmentSystemProposal,WestVanBurenArea
WaterQualityAssuranceRevolvingFundSite,August18.
__________,2012a.1-MonthTechnology/DesignDemonstrationReport:RID-95PilotSystem,
WestVanBurenAreaWaterQualityAssuranceRevolvingFundSite,May8.
__________,2012b. ModifiedEarlyResponseActionProposalForTheWestVanBurenArea
WaterQualityAssuranceRevolvingFundSite,July17.
__________, 2012c. Modified Early Response Action Work Plan, West Van Buren WQARF
RegistrySite,Phoenix,Arizona,October19.
Formatted: Font:Not Bold
Formatted: Font:Bold
Deleted: SummaryReport
Deleted: September
Deleted: b
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__________, 2012d. Long-Term Operational Assessment Report, RID-95 Wellhead Pilot
TreatmentSystems,WestVanBurenWQARFRegistrySite,Phoenix,Arizona,April5.
__________,2014a.DraftFeasibilityStudyReport,WestVanBurenAreaWQARFSite,July15.
__________,2014b.RevisedDraftFeasibilityStudyReport,WestVanBurenAreaWQARFSite,
November26.
Terranext,2012.RemedialInvestigationReport,WestVanBurenWQARFRegistrySite,Phoenix,
AZ,preparedforADEQ,August.
ATTACHMENT2
2
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OPERATION & MAINTENANCE PLAN
RID WELLHEAD TREATMENT SYSTEMS
Prepared for: Arizona Department of Environmental Quality
Prepared by: Synergy Environmental, LLC
On Behalf of: Roosevelt Irrigation District
[INSERTJOELPETERSONPESTAMP]
WEST VAN BUREN AREA WQARF SITE JANUARY 2016
Revision 7 PHOENIX, ARIZONA
i
TABLEOFCONTENTS
1.0 INTRODUCTION.............................................................................................................. 1
2.0 BACKGROUND................................................................................................................ 42.1 SITELOCATIONANDPHYSICALCHARACTERISTICS ......................................................................... 42.2 CONTAMINANTSOFCONCERN ...................................................................................................... 42.3 WATERQUALITY–TREATMENTSYSTEMWELLS ............................................................................ 5
3.0 SYSTEMDESCRIPTION .................................................................................................... 7
4.0 OPERATIONANDMAINTENANCE ................................................................................. 124.1 SYSTEMOPERATIONUPSETEVENTNOTFICATIONS ..................................................................... 124.2 WELLPUMPDETAILS.................................................................................................................... 134.3 LGACTREATMENTSKIDS.............................................................................................................. 154.4 SYSTEMOPERATION .................................................................................................................... 15
4.4.1 TreatmentMode ................................................................................................................... 164.4.2 BypassMode......................................................................................................................... 164.4.3 LGACChange-OutsandBackwash ........................................................................................ 17
4.5 INSTRUMENTATIONANDCONTROLS .......................................................................................... 194.5.1 WellPumps ........................................................................................................................... 204.5.2 FlowMeters .......................................................................................................................... 214.5.3 PressureTransmitters ........................................................................................................... 224.5.4 3-WayValves ........................................................................................................................ 224.5.5 SumpsandLevelSwitches..................................................................................................... 234.5.6 SCADASystem....................................................................................................................... 234.5.7 TemperatureSensors ............................................................................................................ 244.5.8 SiteSecurity........................................................................................................................... 244.5.9 SystemOperationUpsetEvents ............................................................................................ 25
4.6 SAMPLINGANDANALYSIS ........................................................................................................... 254.6.1 PurposeofSamplingandAnalysisProgram ......................................................................... 264.6.2 FrequencyandLocationsofSampling................................................................................... 264.6.3 SamplingMethods ................................................................................................................ 274.6.4 AnalyticalMethodsandProcedures ..................................................................................... 27
5.0 SPENTGACMANAGEMENT .......................................................................................... 30
6.0 DOCUMENTATIONANDREPORTING ............................................................................ 316.1 WEEKLYINSPECTIONFORMS ....................................................................................................... 316.2 MONTHLYPROGRESSREPORTING ............................................................................................... 31
7.0 KEYCONTACTSLIST...................................................................................................... 33
8.0 REFERENCESCITED....................................................................................................... 34
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TABLEOFCONTENTS(Continued)
TABLES
Table
1 SummaryofRecentWaterQualityData–TreatmentSystemWells
2 SummaryofWellConstructionInformation,RooseveltIrrigationDistrict
WellheadTreatmentSites
FIGURES
Figure
1 SiteLocationMap
2 SiteMapandVicinity
3 PipingandInstrumentationDiagram,RID-89WellheadTreatmentSystem
4 PipingandInstrumentationDiagram,RID-92WellheadTreatmentSystem
5 PipingandInstrumentationDiagram,RID-95WellheadTreatmentSystem
6 PipingandInstrumentationDiagram,RID-114WellheadTreatmentSystem
APPENDICES
Appendix
A RID-89WellheadTreatmentSystemDrawings
B RID-92WellheadTreatmentSystemDrawings
C RID-95WellheadTreatmentSystemDrawings
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TABLEOFCONTENTS(Continued)
APPENDICES(Continued)
D RID-114WellheadTreatmentSystemDrawings
E SiemensOperation&MaintenanceManual
F EquipmentManuals
G SCADASystemScreenShots
H Health&SafetyPlan
I AirtechEnvironmentalLaboratories–Method8260BSOP
J WeeklyOperationandMaintenanceInspectionForm
K ExampleChain-of-CustodyForm
L MonthlyProgressReportExample
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January2016,Revision7
OPERATIONANDMAINTENANCEPLAN–
RIDWELLHEADTREATMENTSYSTEMS
WESTVANBURENAREA
WATERQUALITYASSURANCEREVOLVINGFUNDSITE
1.0 INTRODUCTION
GroundwaterintheWestVanBurenAreaWaterQualityAssuranceRevolvingFundSite(WVBASite) containshazardous substances,principally volatileorganic compounds (VOCs) thathaveimpacted Roosevelt Irrigation District (RID) production wells. Arizona Department ofEnvironmentalQuality(ADEQ)acknowledgedthattheRIDwellsthatextractanddischargeVOC-contaminatedgroundwatertosurfacewaterarethemajoroutflowofcontaminationfromtheSite (Terranext, 2012). Itwas furthernoted that theRID canals provide apotential routeofsurfacewatercontaminantmigrationwithinanddownstreamoftheWVBASite.RID relies on the wells within the WVBA Site to meet critical water supply needs and,consequently,submittedaWorkPlanforconductinganEarlyResponseAction(ERA)torestorea portion of these impacted wells for current and reasonably foreseeable beneficial uses,includingfutureuseasadrinkingwatersource(Montgomery&Associates,2010),asprovidedintheArizonaWaterQualityAssuranceRevolvingFundProgram:
• ArizonaRevisedStatus(ARS)§49-282.06.B.4.b;and,• ArizonaAdministrativeCode(A.A.C.)R18-16-405.
AlthoughtheERAwasdesignedtocaptureandtreathazardoussubstancesprimarilyasawellprotectionandwatersupplyinitiative,theactionwasalsoproposedtomitigatepublicexposureassociated with the uncontrolled release of VOCs in groundwater pumped by RID from theWVBA Site. Air and water sampling was conducted in accordance with the Public HealthExposureAssessmentandMitigationWorkPlan(SynergyEnvironmental[Synergy],2011a).Theresulting data enabled review of the potential insight into the fate and transport of thesecontaminants (Synergy, 2011b). The assessment compared the sampling results to health-basedguidelinestomakeascreening-leveldeterminationastowhetherthesesubstancespose
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asignificantrisktopublichealthandprovidedatatoassist indevelopingdetaileddesignsforengineeringcontrolstolimituncontrolledVOCemissions.Consistent with the Task 4-Engineering Design Study required by the ADEQ in the ERAconditional approval letter of June 24, 2010 (ADEQ, 2010), RID submitted a proposal toconstruct and operate a pilotwellhead treatment system at RID-95 and additional wellheadtreatmentatselectsites(SynergyEnvironmental,2011c).InaletterdatedSeptember2,2011,ADEQauthorizedimplementationofRID’sproposedPilotSysteminitiative(ADEQ,2011).Beforeinitiatingtreatmentattheadditionalwellsites(i.e.,RID-89,RID-92andRID-114)underRID’s proposed Pilot System initiative, RID agreed to prepare and submit a near-termassessment, following one month of system operation, to consider the technology, systemdesignand site-specificengineeringandoperationcontrols todetermine theeffectivenessofliquid-phase granular activated carbon (LGAC) and the reliability of the system asdesigned/operated to provide safeguards to protect public health in the event of systemfailures (in accordance with A.A.C. R18-16-411). The 1-Month Technology/DesignDemonstration Report: RID-95 Pilot System (Synergy, 2012a), describes the successfulcompletion of the assessment period, which demonstrated the reliable operation of thetreatment system without identification of any design or operational issue that couldreasonablyendangerpublichealth.On July 17, 2012, aModified ERA Proposal (Synergy, 2012b) was submitted to ADEQ as anaddendumtotheoriginalERAWorkPlan,datedFebruary3,2010andconditionallyapprovedbyADEQonJune24,2010(ADEQ,2010). TheaddendumwasproposedinordertoprovideamorecosteffectiveapproachtoaccomplishthegoalsoftheERAremedialaction.TheModifiedERAProposalprovidedanoptimizeddesignapproachtoaddressthehighestcontaminatedRIDwells located in the WVBA Site and incorporated information and insights gained from theinvestigationsprescribedbyADEQintheoriginalERAWorkPlanletter(Tasks1through4)andfromthePilotSysteminitiative. Basedonthedetailedconsiderationandanalysisofthisnewinformation, RID proposed substantive modifications to the original ERA Work Plan, whichincluded utilizing a combination of treatment and blending to effectively reduce theconcentration of VOCs from several additional, lower concentration wells resulting in lowervolumeofwaterbeingdirectly treatedwhileprovidingahigher totalvolumeofgroundwaterthatisremediatedtomeetapplicablefederalmaximumcontaminantlevels(MCLs).OnOctober19, 2012, Synergy submitted the Modified ERA Work Plan to ADEQ, which incorporatedapplicable content from the original ERA Work Plan and from the Modified ERA Proposal(Synergy,2012c).InaletterdatedFebruary1,2013,ADEQconditionallyapprovedtheModifiedERAWorkPlan(ADEQ,2013).InJuly2014,RIDsubmittedaFeasibilityStudyReport(Synergy,2014a)toADEQpursuanttotheRIDFeasibilityStudyWorkPlanapprovedbyADEQonJuly16,2013.TheRIDFeasibilityStudy
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ReportwaspreparedtoevaluatepossiblegroundwateralternativeremediesanddetermineaproposedgroundwaterremedyfortheWVBASitethatwouldaddressallRIDwellsthatwouldnot be fit for their current and reasonably foreseeable end uses due to the releases of VOCcontaminants (in accordancewithARS §49-282.06.B.4.b). Remedial strategies andmeasureswere developed tomeet all applicable remedial action criteria inARS §49-282.06 andA.A.C.R18-16-407andformulatedintopossiblegroundwateralternativeremediesthatarecapableofachieving theRemedialObjectivesestablishedbyADEQ for theWVBASite. RID submittedarevised Feasibility Study Report (Synergy, 2014b) to ADEQ on November 26, 2014 thataddressedcomments fromADEQandwas subject topublic commentsandapublicmeeting.ADEQapprovedRID’sFeasibilityStudyReport,includingtheproposedremedialaction,onApril13,2015(ADEQ,2015).ConsistentwiththeADEQletterdatedSeptember2,2011,thatagreedwithimplementationofthe Pilot System initiative, the Long-Term Operational Assessment Report, RID-95 WellheadPilot Treatment Systems documented the long-term performance of thewellhead treatmentsystems inorder “…todeterminewhetherwellhead treatment canbeaneffective treatmenttechnology…(that results in)…reducing the cost of the final remedy…and/or mitigatingcontaminantexposure”(Synergy,2012d). TheAssessmentReport indicatedthattheRIDPilotSystem initiative conclusively demonstrated the cost effectiveness of the technology, andtherefore the reasonableness of the selected remedy in the Modified ERA that wasincorporated and expanded in the Feasibility Study Report in order to effectively treat thecontaminatedgroundwaterimpactingRID’swellsandthesuccessfulmitigationofpublichealthexposurestothesecontaminantsatallimpactedRIDwells.PursuanttoA.A.C.R18-16-411,RIDwastoprepareandsubmitanOperationandMaintenance(O&M)PlantoADEQtoimplementalloranyportionofaremedyorearlyresponseaction.ThisO&M Plan, which was certified by ADEQ on April 10, 2015, provides equipment andconstruction details, the sampling and analysis program, and specific O&M and reportingprocedures for theRIDwellheadtreatmentsystems included in theADEQ-approvedremedialactions, and shall replaceall previouseditions. Updates and/or revisionswill continue tobemadetothisO&MPlan,asnecessary. Ataminimum,thisO&MPlanwillbereviewedonanannualbasistoconfirmaccuracyandcompleteness.
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2.0 BACKGROUNDA summary of the physical setting, hydrogeologic and groundwater conditions, sources ofcontamination and impacts on RID wells and operations was provided in the WVBA SiteRemedialInvestigation(RI)Report(Terranext,2012).TheRIReportwaspublishedbyADEQinAugust2012,andincludedadiscussionofthenatureandextentofcontaminationintheWVBASite. Briefdescriptionsof theSite locationandphysical characteristics, thecontaminantsofconcern (COCs) present at the Site and the impact of the contamination on the RID watersystemsareprovidedinthefollowingsections.
2.1 SITELOCATIONANDPHYSICALCHARACTERISTICS
LandusewithintheWVBAispredominantlyzonedindustrialwithsmallertractsofresidential(withelementaryschoolsandchurches)andcommercial.TheWVBASiteislocatedwithintheCity of Phoenix Central City and Estrella urban villages (Figure 1). Based on data generatedthrough applied use of the Environmental Justice Screening and Mapping Tool (EJSCREEN)developedbytheU.S.EnvironmentalProtectionAgency(EPA),thereareapproximately51,600peopleresidingwithin thegeneralboundariesof theWVBASiteandthedemographicprofileindicatestheresidentspredominantlycomprisealowincome,minoritypopulation.1Withthesignificant acreage of agricultural land available to be developed in the future, the EstrellaVillage (41 squaremiles) is identified as a Phoenix targeted growth area, and is expected toexperiencesignificantincreasesinbothemploymentandresidentialgrowth(Synergy,2011b).
Figure 2 depicts the approximate boundaries of the groundwater contamination, as well asrelevantfeatureswithintheWVBASite.TheextentofgroundwatercontaminationassociatedwiththeWVBASite isgenerallyboundedonthenorthbyMcDowellRoad,ontheeastby7thAvenue,onthesouthbyLowerBuckeyeRoad,andonthewestbeyond79thAvenue.
2.2 CONTAMINANTSOFCONCERN
TheCOCsintheWVBASitehavebeenidentifiedbasedonhistoricalandpresentdataobtainedfromsamplescollectedbyADEQandRIDfromtheimpactedRIDgroundwatersupplywellsoverthepast20years. TheseCOCscomprise thecommingledWVBASiteplumeandare listedasfollows(includingthechemicalnameandtheChemicalAbstractService(CAS)number:
• 1,1-Dichloroethene(1,1-DCE) CASnumber75-53-4
1Seewww.epa.gov/ejscreenforenvironmentalindicatorsanddemographicdataapplicabletothegeneralboundariesoftheWVBASite.
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• Tetrachloroethene(PCE) CASnumber127-18-4• Trichloroethene(TCE) CASnumber79-01-6• 1,1,1-Trichloroethane(TCA) CASnumber71-55-6• cis1,2-Dichloroethene(cis1,2-DCE) CASnumber156-59-2• 1,1-Dichloroethane(1,1-DCA) CASnumber75-34-3
ChromiumisalsoaCOCthatoccurs locallywithintheWVBASiteboundaries. ThechromiumconcentrationsintheimpactedRIDwells(Synergy,2014b)arewellbelowthefederalMCLfordrinkingwaterandhaveonlybeendetectedintwo(2)wells:RID-102andRID-104;neitherofwhichwas selected forwellhead treatment. Consequently, chromium is not included in thesamplingandanalysisprogramaspartofthisO&MPlan.Only three (3) of the listed COCs (i.e., TCE, PCE and 1,1-DCE) are present in the impactedgroundwater within theWVBA Site at concentrations that exceed theMCLs. Consequently,theseCOCsarereferredtoasthe“targetCOCs”inthisO&MPlan.ThetargetCOCswillbeusedtodeterminewhenGACreplacementisnecessary.
2.3 WATERQUALITY–TREATMENTSYSTEMWELLSA summary of recent historical analytical data that presents target COC concentrations forsamplescollectedbyADEQfromRIDtreatmentsystemwellsisincludedbelow.AllresultsthatareequaltoorexceedMCLsareindicatedinredtext.
Table1.SummaryofRecentWaterQuality–TreatmentSystemWells
Allconcentrationsarepresentedasmicrogramsperliter(µg/L):
WellRID-89 WellRID-92 WellRID-95 WellRID-114SampleDate TCE PCE 1,1-DCE TCE PCE 1,1-DCE TCE PCE 1,1-DCE TCE PCE 1,1-DCE
Mar-13 34.1 11.0 2.39 73.5 14.7 5.17 54.4 3.44 9.23 48.6 2.20 3.33
Sep-13 37.5 11.7 3.14 86.4 14.5 6.22 59.6 3.71 7.52 39.0 2.63 2.50
Mar-14 35.5 10.3 2.84 76.2 13.5 4.84 44.0 2.99 6.18 45.6 2.86 3.01
Mar-15 33.8 9.39 2.68 81.6 12.3 4.39 42.2 2.80 5.74 48.1 2.51 2.84
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2.4 TREATMENTGOALS
TheminimumstandardfortreatedwaterqualityatthewellheadtreatmentsystemsistheMCLforeachofthetargetCOCs,whichisconsistentwiththefinalRemedialObjectivessetforthinthe Final RI Report, AppendixAA (Terranext, 2012). The currentMCL for each of the targetCOC’sisprovidedinthefollowingtable.
TargetCOC MCL(µg/L)
Trichloroethene(TCE) 5.0
Tetrachloroethene(PCE) 5.0
1,1-Dichloroethene(1,1-DCE) 7.0
Thepointofcompliance(POC)sampleports(installedinthe14-inchdischargepiping,locateddownstream of the treatment skids and immediately upstream of the receiver box for eachtreatment system, see Figures 3-6) is the location for demonstrating that each treatmentsystemachievestheseTreatmentGoals.
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3.0 SYSTEMDESCRIPTION
RID has selected a pre-engineered LGAC system, manufactured by Siemens WaterTechnologies, to treat the discharge from the impacted RID production wells. The selectedLGACsystems,describedinmoredetailinSection4.3,aremodularandconsistoftwo(2)GACpressurevessels,atreatment“skid”,withacapacityof1,000gallonsperminute(gpm,nominal)with Siemens stated maximum of 1,100 gpm. The treatment skids are installed on andanchored to concrete containment pads with 6-inch curbing and sumps. Each dischargestructure is enclosed and sealed for volatilization control. Wellhead treatment will beconducted in amanner consistentwith theADEQ-approved remedial actions. Design/recorddrawingsforthepreviously installedwellheadtreatmentsystemsare includedasAppendixA(RID-89),AppendixB(RID-92),AppendixC(RID-95),andAppendixD(RID-114).Design/recorddrawings for the additional wellhead treatment systems that will be installed pursuant toADEQ-approvedremedialactionswillbeincludedtosupplementthisO&MPlan.
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1. RID-89: Located on the east side of 51st Avenue, approximately ¼-mile north ofBuckeyeRoad;thesiteareaisapproximately4,500squarefeet(ft2).Basedonnominalflowrateof3,400gpm,RIDinstalledthreeskids.Fromthenorth(left)tothesouth(right),eachpairofvessels(skids)arenumbered1,2,and3;withindividualvesselslabeled(again,northtosouth):89-1Aand89-1B(skid1);89-2Aand89-2B(skid2);and89-3Aand89-3B(skid3).
1A1B
2A 2B 3A 3B
51StAvenue
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2. RID-92: Located on the east side of 43rde Avenue, approximately ¼-mile north of
BuckeyeRoad;thesiteareaisapproximately2,400ft2. Basedonnominalflowrateof1,400gpmandlimitedavailablefootprint,RIDinstalledasingleskid.Vesselsarelabeled92-1A(westvessel)and92-1B.
1A1B
43rdAvenue
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3. RID-95: Located on the northeast corner of Sherman Street and 35th Avenue,
approximately¼-milenorthofBuckeyeRoad; thesitearea isapproximately6,900 ft2.Basedonnominalflowrateof1,850gpm,RIDinstalledtwoskids.From south to north, skids are numbered 1 and 2; with vessels labeled: 95-1A (eastvessel)and95-1Bforskid1;and95-2A(westvessel)and95-2Bforskid2.
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4. RID-114:Locatedatthesouthwestcornerof23rdAvenueandVanBurenStreet;thesite
areaisapproximately7,000ft2.Basedonnominalflowrateof2,500gpm,RIDinstalledthreeskids.Fromnorthtosouth,skidsarenumbered1,2,and3;withvesselslabeled:114-1Band114-1A(skid1);114-2Band114-2A(skid2);114-3Band114-3A(skid3).
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4.0 OPERATIONANDMAINTENANCE
Thefollowingsectionsdescribethespecificdetailsforoperatingandmaintainingthewellheadtreatmentsystems, includinganotificationsprocedureduringsystemoperationupsetevents;and details for RID’s well pumps, the selected LGAC treatment skids, wellhead treatmentsystemoperations,instrumentationandcontrols,andthesamplingandanalysisprogram.
4.1 SYSTEMOPERATIONUPSETEVENTNOTFICATIONS
TheOperator receivesautomatednotifications (onhismobilephone) toalert in theeventofcertain control conditions described in detail in Section 4.5.9, and is required to respond, asappropriate, toeachnotificationwithin2hours. TheOperatorwillnotifyRIDandSynergy inthe event of significant process control change(s), problem(s) or failure(s). As soon as theissue(s)oftheeventarereviewedandfullyunderstood,SynergywillnotifyADEQbytelephonewithin24hoursofoperationalchangesmadetothewellheadtreatmentsystems,ifthequalityofthetreatedwatercouldbeaffected,orifreleasestotheenvironmenthaveoccurred.ContactinformationfortheindividualstobenotifiedbyOperator/Synergyisincludedbelow:RooseveltIrrigationDistrictDonovanNeese,PE KenCraigSuperintendent WaterOperationsManagerEmail:[email protected] Email:[email protected]:(623)670-4760 Phone:(623)695-5855 On-DutyWaterMaster:(623)386-2046AgencyOversightScottGreenArizonaDepartmentofEnvironmentalQualityEmail:[email protected]:(602)771-1612In accordance with A.A.C. R18-16-411(E)(4), this O&M Plan shall include “a process for thetreatmentsystemOperatortopromptlynotifypotentiallyaffectedwaterprovidersofafailureof a key treatment systemcomponent that couldaffect thequalityof adischargeof treatedwater.”TreatedwaterfromthewellheadtreatmentsystemscurrentlyisexclusivelydischargedtoRIDcanals and laterals foragriculturaluse.Consequently, therearenootherpotentially affected
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waterproviderswithintheWVBASitethatwouldbeaffectedbyadischargeoftreatedwaterinthe event of significant process control issues or failures at any of the wellhead treatmentsystems.However,atsuchtimeinthefuturewhenRIDplanstoservetreatedwatertopersonsorparties formunicipal and industrial enduse, thisO&MPlanwill be revised to identify theaffected water provider(s) and the process by which RID will promptly notify those waterprovidersofanyfailureofakeytreatmentsystemcomponentthatcouldaffectthequalityofthedischargeoftreatedwater.TherevisedO&MPlanwillbesubmittedforADEQapprovalatleast90dayspriortoinitiationofwaterdeliverytotheaffectedwaterprovider(s).
4.2 WELLANDTREATMENTSYSTEMDETAILS
Table2providesdetailsforwellconstruction(i.e.,holedepth,screenintervals,unitsscreened,casingtotaldepthandcasingdiameters),historicaldepthtowaterandpumpingwater levels,andpumps/motorscurrently installedandoperatingateachwellheadtreatmentsystemsite.ThecontrolstrategyforeachwellpumpisprovidedinSection4.5.1.Followingisasummaryofnormal operating values for each of the currently installed wellhead treatment systems. Asimilardescriptionoftheoperatingparametersfortheadditionalwellheadtreatmentsystemsthat will be installed pursuant to ADEQ-approved remedial actions will be included tosupplementthisO&MPlan.
RID-89
ParameterNormal
OperatingValueWellheadPressure(Bypass) 0.5psiWellheadPressure(Treatment) 16.5psiFlowRate(Bypass) 3,200-3,300gpmFlowRate(Treatment) 2,300-2,600gpmSkid1Post-LeadVesselPressure 12psiSkid1EffluentPressure 2.0psiSkid2Post-LeadVesselPressure 12psiSkid2EffluentPressure 2.0psiSkid3Post-LeadVesselPressure 11psiSkid3EffluentPressure 1.5psi
Notes:psi=poundspersquareinchgpm=gallonsperminute
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RID-92
ParameterNormal
OperatingValueWellheadPressure(Bypass) 0.5psiWellheadPressure(Treatment) 21psiFlowRate(Bypass) 1,400gpmFlowRate(Treatment) 1,100-1,200gpmSkid1Post-LeadVesselPressure 2.0psiSkid1EffluentPressure 1.0psi
RID-95
ParameterNormal
OperatingValueWellheadPressure(Bypass) 1.0psiWellheadPressure(Treatment) 12.5psiFlowRate(Bypass) 1,750gpmFlowRate(Treatment) 1,500-1,600gpmSkid1Post-LeadVesselPressure 5.0psiSkid1EffluentPressure 2.0psiSkid2Post-LeadVesselPressure 7.0psiSkid2EffluentPressure 2.0psi
RID-114
ParameterNormal
OperatingValueWellheadPressure(Bypass) 0.5psiWellheadPressure(Treatment) 11.5psiFlowRate(Bypass) 2,400gpmFlowRate(Treatment) 2,100-2,300gpmSkid1Post-LeadVesselPressure 7.0psiSkid1EffluentPressure 2.0psiSkid2Post-LeadVesselPressure 7.0psiSkid2EffluentPressure 3.0psiSkid3Post-LeadVesselPressure 6.0psiSkid3EffluentPressure 2.5psi
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4.3 LGACTREATMENTSKIDS
The wellhead treatment systems consist of Siemens HP-1220 LGAC treatment skids, eachcapableoftreatinganominalflowof1,100gpmofwaterinseries(lead-lag)configuration.Thenumbersofskidsateachwellsitecurrentlyinclude:RID-89(3),RID-92(1),RID-95(2)andRID-114(3),foratotalof9skids.TheLGACtreatmentskidsincludethefollowingstandarddesignfeatures:
• Down-flowconfigurationtofacilitatebackwash;• Integratedpiping(8-inchschedule40carbonsteel)withcastirongear/wheelbutterfly
valveswithEPDMseats,configuredtoallowseries,parallelorvessel-isolationflow;• Systemsoperateutilizingexistingwellequipmenttopumptheimpactedgroundwater
throughtheLGACvesselsfortreatmentandperiodicbackwash;• Equippedwithsampleportsattheskidinfluent,25%,50%and75%ofGACbeddepth,
andvesseleffluenttoenablemonitoringofmasstransferzoneandbreakthrough;• 20,000poundcarboncapacityineachcarbonsteelvessel(7,520gallonvolume);• Operating flow rate of 1,100/2,200 gpm (series/parallel) per skid and 1,000 gpm
backwash flow rate (higher flow rates can be achieved but empty bed contact timewoulddecreaseproportionally);
• IntegratedGACtransferpiping(4-inchSchedule10304Lstainlesssteel);and,• Vessels and piping are rated to 125 psi and burst discs are integral to the piping to
safelyreleaseanddivertwaterintheeventofover-pressure.During2013and2014,criticalmaintenanceworkwasneededatall four (4)currentwellheadtreatment systems (i.e., all 18 vessels) to replace corroded piping (4-inch, Schedule 10 304LstainlesssteelGACfillandremovallines),whichwerecoveredunderwarranty.SimilardefectshavebeenobservedontheSiemensGACequipmentinstalledattheNorthIndianBendWashfederalSuperfundSite.EachpipewasremovedandreplacedbySiemens’(nowEvoquaWaterTechnologies)contractorSmythIndustries,ofTucson,ArizonawiththeGACfill linesprimarilyreplacedin2013andtheGACremovallinesreplacedon10of18vesselsduringcarbonchange-out activities from June through October 2014. The remaining GAC removal lines will bereplacedwhencarbonchange-outactivitiesareneededonthe8currentlyremainingvessels.
4.4 SYSTEMOPERATION
General system operation for each LGAC skid includes operation in treatmentmode, bypassmode,andamodifiedtreatmentmodetofacilitateLGACchange-outsand/orbackwash.Eachskidisconfiguredforseries(orlead-lag)operationfornormaltreatmentmode,butarecapableofparallelorsinglevesseloperation,asnecessary,tofacilitatemaintenanceactivities.
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Operationalperformancedatawillbecontinuouslymonitoredandcollectedonamonthlybasisusing the instrumentation and supervisory control and data acquisition (SCADA) systemdescribedinSection4.5.6.AnOperation&MaintenanceManual(preparedbySiemens)forthepre-engineeredLGACskidsis included asAppendix E, and provides equipment details/specifications including: standardprocedures to operate the treatment skids (i.e., start-up, carbon changes, backwashing),troubleshooting,systemmonitoring,shutdownandemergencyprocedures,maintenance, listsofscheduledmaterials (withpartnumbers)onthedrawings inSection8.0,andspecificationsfor the vessels (i.e., drain system, valves, burst disks, spray nozzles, pressure gauges, andinterior/exterior coatings). Although the Operation & Maintenance Manual specificallyidentifies“WellSite95”, thesameManual isapplicable to theequipmentandoperations forthe other three (3) current wellhead treatment systems (RID-89, RID-92 and RID-114).Therefore,onlyoneManualisincludedaspartofthisO&MPlan.A flow diagram and valve sequence chart are also included in the Siemens Operation &MaintenanceManualandonFigures3-6.EachvalveassociatedwiththeHP-1220systemshasbeenclearlylabeledinthefieldtohelptheOperatorwhenmakingchangestotheoperationofthetreatmentsystems.
4.4.1 TreatmentModeEach LGAC skid is operated in conjunction with RID’s pumping schedule with cessation oftreatment during well maintenance activities, treatment system maintenance activities(requiring system shut-down), lack of adequate funds from third parties or cost recoveryactionsorunanticipatedfailures(includingbutnotlimitedto:poweroutages,criticalalarms,orequipmentmalfunctions).
4.4.2 BypassModeShoulditbecomenecessarytoshutoffanyofthetreatmenttrains,andRIDrequirestheflowfromthatwell, theuntreatedflowmaybetemporarilybypassed(inpartor inwhole)aroundthetreatmentsystemanddischargeddirectlyintotheexistingreceiverboxuntiltreatmentcanresume(utilizingthe3-wayvalve,seeSection4.5.4).The notification procedure in Section 4.1 shall be followed if a treatment system is changedfrom treatment mode to bypass mode (full bypass) due to a system upset event. Otheroperational changes that require partial bypass, including carbon change-out activities or
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changesinRID’swaterdemandthatrequirefullbypass,forexample,willbedocumentedintheMonthlyProgressReports(Section6.2).ThereisaroutineoccurrencewhenoperationinpartialbypassmodeisnecessaryattheRID-92wellheadtreatmentsystem.SincethereisonlyonetreatmentskidatRID-92,partialbypassisnecessary during carbon change out activities to fluidize the GAC for removal and refillingactivities,andbackwashing.Partialbypassisnecessaryinthiscasetopreventexcessivelyhighflowrateduringbackwash,whichcouldresultinpossiblelossofGAC.Sinceallothertreatmentsystems utilize two or three treatment skids, this mode of routine partial bypass is onlynecessaryattheRID-92wellheadtreatmentsystem.Duringfullorpartialbypassoperation,theSCADAsystemisstillfunctioningandthechangeinflowpathisshownonthecontrolscreensandcapturedbydataacquisition.Whenthisoccurs,thewellhead pressurewill decrease and flowswill increase (due to reduced pressure head).Duringfullbypassmodeoperation,pressuredifferentialacrosstheleadandlagvesselsgoestozero,andtherefore,noalarmsaretriggered.
4.4.3 LGACChange-OutsandBackwashLGACbed lifewillbeassessed/monitored ineach treatmentsystembysamplingandanalysisfor targetCOCsasdescribed in Section4.6. Carbonchange-outswill be scheduledbasedonCOC concentrations as determined in weekly water quality analytical results. Trigger levelshavebeenestablishedbasedonthebreakthroughperformancefromthelastseveralyearsoftreatment systemoperation at each of the four (4) current treatment systems, as describedbelow.EachofthefourtreatmentsystemshasauniquebreakthroughprofilethatisdependantonthemixtureandrelativeconcentrationsoftheCOC’saswellastheflowratethrougheachsystem.BreakthroughcurvesatRID-89andRID-114treatmentsystemsareverysimilar,however,duetothefactthatbothhaverelativelylowconcentrationsof1,1-DCEinthepumpedgroundwater(less than3µg/L). Breakthroughcurvesarealsosimilar for treatmentsystemsatRID-92andRID-95wherepumpedgroundwatercontainshigherconcentrationsof1,1-DCE,between6and8µg/L.TheMCL (and treatmentgoal) for1,1-DCE is7µg/L; therefore,exceedanceof this treatmentgoalatRID-89orRID-114isextremelyunlikelywithsuchlowinfluentconcentrations.Thereisthepotential,however,forexceedanceofthistreatmentgoalatRID-92andRID-95.Therefore,twosetsoftriggerlevelshavebeenestablished.Trigger levels formanagingGAC replacements includeboth“alert” levelsand“action” levels.Alertlevelsareinplacetopromptaheightenedawarenessandreviewofthewaterqualitydata
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trends to ensure that no significant changes have occurred (e.g. abrupt rise in influentconcentration)and toprovideadvancedconsideration inchange-outplanning. Action levelsareinplacetotriggermandatoryinitiationofGACchange-out.These trigger levels apply to the COC concentrations noted in the water quality analyticalresultsforthesamplesspecifiedasfollows:
RID-89andRID-114
AlertLevel: 3.0µg/L 1,1-DCE InfluentSample 4.0µg/L 1,1-DCE PointofComplianceActionLevel: 2.5µg/L TCEorPCE PointofCompliance(1/2MCL) 6.5µg/L 1,1-DCE PointofCompliance
RID-92andRID-95
AlertLevel: 1.5µg/L TCEorPCE PointofCompliance 2.5µg/L 1,1-DCE PointofComplianceActionLevel: 2.5µg/L TCEorPCE PointofCompliance(1/2MCL) 3.5µg/L 1,1-DCE PointofCompliance(1/2MCL)
Again, “alert levels” are established as an early warning indicator whereas “action levels”triggermandatory initiationofGACchange-out. GACmaybe replacedprior toexceedinganaction level, however, at the discretion of the operator for reasons such as to facilitatescheduled or unscheduled maintenance or in preparation for an extended shutdown(particularlywiththosebedsnearexhaustion).A carbon change-out with reactivated GAC will be scheduled according to the conditionsprescribed. When such a condition is observed, the lead vessel of the skidwith thehighesttargetCOCconcentration intheMid-Skidsamplewillbescheduledfor thechange-outunlessthechange-outisinitiatedtofacilitatemaintenanceonadifferentvessel2.Duringeachcarbonchange-out,thelagvesselwillbereconfiguredasleadandthespentGACremovedfromtheexhaustedvesselandreplacedwithfreshreactivatedGAC.Duringremovaland replacement of the spent GAC from the exhausted vessel, the remaining vessel willcontinuetotreattheflowonastand-alonebasis(i.e.,singlepass).Insomeinstances,itmaybe
2 Currently, the RID-92 wellhead treatment system only has a single skid.
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necessary to isolate an entire skid and/or switch to partial or full bypass to facilitatemaintenanceactivities.Following recharging of the exhausted vessel, the recharged vessel will be backwashed toremove fines, left to soak for approximately24hours to removeentrainedair, andputbackintoserviceasthe lagvesselandremain inthatconfigurationuntil the leadvessel requiresacarbonchange-out. Backwashwillbeconductedataflowofapproximately1,000gpm(usingtreatedwater conveyed from the new lead vesselwhile operating in stand-alone basis) andbackwashwaterwillbedivertedfromthebackwashedvesseldirectlytothedischargereceiverbox.Basedoncarbonchange-outfrequenciesforeachofthecurrentwellheadtreatmentsystems3todate,theestimatedchange-outschedulepervesselateachsiteisincludedbelow:
• RID-89:4-5monthsofoperation• RID-92:2-3monthsofoperation• RID-95:2-3monthsofoperation• RID-114:5-6monthsofoperation
4.5 INSTRUMENTATIONANDCONTROLS
The wellhead treatment systems are equipped with instrumentation and controls (I&C),designed and integrated by Vertech, that provide real-time monitoring of key performanceparameters of system operation. The I&C also enables remote operation andmonitoring ofsystem operations and provides alarm notification for key process and control parameters.Control System record drawings for the currentwellhead treatment systems are included inAppendixA(RID-89),AppendixB(RID-92),AppendixC(RID-95),andAppendixD(RID-114).Instrumentationisincludedtomonitor:
• Wellpumprunstatus;• Welldischargeandbypassflowrates(instantaneousandtotalized);• Flowtoeachtreatmentskid(instantaneousandtotalized);• Wellheadpressure;and,• Differentialpressureacrosseachtreatmentskid.
Controls/alarmsareincludedfor:
• Pumpstart/stop;3 These systems currently only operate 7-8 months per year based on RID’s historical operations.
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• Bypassflow;• Lowflowateachtreatmentskid;and,• Waterlevelinsumpsandsumppumpstart/stop.
These I&C nodes are integrated into a SCADA system that allows for remote control of thesystems as well as continuous monitoring capabilities and data storage to document keyaspects of treatment system operations and demonstrate the level of reliability required toensurethesuccessfulremediationofthegroundwatersupply(i.e.,toachieveTreatmentGoals)andtheprotectionofpublichealth.ThefollowingsectionsdescribethevariousI&Ccomponents,includingO&Mrequirementsforeach.EquipmentmanualsforeachcomponentareincludedinAppendixF.
4.5.1 WellPumpsThe well pumps for the wellhead treatment systems convey groundwater through thetreatment skids (treatmentmode) or directly to the discharge structure (bypassmode). ThepumpscanbecontrolledmanuallyfromthelocalOperatorInterfaceTerminal(OIT),mountedtothefrontoftheRemoteTerminalUnit(RTU)controlpanel,oroperatedremotelyfromtheOIT in thecontrol roomatRID-95 (orvia remoteconnectiontotheOIT in thecontrol room).TheOITinthecontrolroomcancontroloperationsforallfour(4)currentwellheadtreatmentsystems.
SystemStart-UpandShutDownProcedures
Prior to start-up of each wellhead treatment system, the Operator shall inspect the systemcomponents for potential problems (including water accumulation in the containment areasump[s]),inspectpipingforsignsofleaks,verifyallcontrolandisolationvalvesarepositionedproperly,andacknowledge/clearanyalarmsontheOITs.TheOperatorwillchecktoseeifthepumpswitchateachsiteisin“Auto”modeinsidethemotorcontrolcenter(MCC)cabinet.
• Wellpumpsarestartedmanuallybypressingthe“MainPumpStart”pushbuttononthelocalOITortheOITlocatedinthecontrolroom(orviaremoteconnectiontotheOITinthecontrolroom).
• Followingstart-up,theOperatorwillmonitorthetreatmentsystemsforaminimumof15minutestoverifyproperoperation.
• Each well pump will run continuously until manually stopped by pressing the “MainPumpStop”pushbuttononthelocalOITorattheOITlocatedinthecontrolroom(orvia remote connection to the OIT in the control room). Well pumps can also be
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manually stopped by switching from Auto to OFF using the local controls in theswitchgearcabinetadjacenttothewell.
ShutDownConditions
• Eachwellpumpwillstopautomaticallyintheeventofamotoroverloadcondition.The
pumpwillneedtoberestartedmanuallyattheMCCcabinetaftertheoverloadrelayforthepumpmotorstarterisreset.
• Intheeventofapowerfailure/outagewhilethepumpisrunning(seeSection4.5.9),thepumpwillattempttorestartonetime. If theattempt fails, thepumpwillneedtoberestartedmanually at the localOIT or remotely at the control room after the SCADAcomputerisrestarted.
• In the event of an overload conditionwith the pumpmotor starter, an alarmwill bedisplayedontheOITatthelocalcontrolpanelandattheOITinthecontrolroom,andtheOperatorwillbenotified.
• Intheeventofalow-lowflowratecriticalalarmatatreatmentskid,theOperatorwillbenotified and thewell pumpwill automatically shut off at that site. For this criticalalarm, theOperatorwill follow the systemupset notifications proceduredescribed inSection4.1.
• When water (e.g., rain water or process water) accumulates in a sump, a high-levelswitchalarmwill resultwhenwater reaches the first floatalarmpoint. TheOperatorwill benotified and the sumppump(s)will start automatically to discharge thewateruntil thewater leveldropstobelowthefirstfloatalarmpoint. Iftheaccumulationofwater reaches the second float alarm point, a high-high critical alarm will result inanothernotificationtotheOperator,andthewellpumpwillautomaticallyshutoff.Forthis critical alarm, the Operator will follow the system upset notifications proceduredescribedinSection4.1.
4.5.2 FlowMeters
Manufacturer/Model Size
Sensor/TransmitterType
Siemens,SitransFMMagflo® 8”&14” MAG5100W/MAG5000
• 8-inch flow meters installed one per treatment skid to measure instantaneous andtotalizedflowofrawgroundwater(i.e.,influent).
• 14-inchflowmetersinstalledoneperwellsiteonthebypasspiping.AtRID-89,RID-92andRID-114,theflowmetermeasureswelldischargeflowinbothtreatmentandbypassmodes (instantaneous and totalized values). At RID-95, the 14-inch flowmeter onlymeasures bypass flow (instantaneous and totalized) due to operational/mechanical
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constraints within the treatment system concrete pad. Treatment flow at RID-95 ismeasuredbythetwo8-inchflowmeters,whicharecombinedtoderivethetotalwelldischargeflowrate.
• If a treatment skid flow rate at a site falls below the low-low flow rate critical alarmvalue,(summarizedinSection4.5.6),theOperatorwillbenotifiedandthewellpumpatthatsitewillautomaticallyshutoff.
4.5.3 PressureTransmitters
Manufacturer/Model Range OrderNo.Siemens,SitransP200 0-200psig 7MF1565-4CB
• Ateachsite,onepressuretransmitterislocatedupstreamofthe3-wayvalvetomonitor
wellheadpressure(seeFigures3-6).• At each site, one pressure transmitter is located on the effluent piping of each
treatmentskidtomonitoreffluentwaterpressureanddifferentialpressureacrossthevessels (see Figures 3-6). If the differential pressure (calculated from the valuesmeasuredatthetransmitterlocatedimmediatelydownstreamofthewellheadandthetransmitter at the effluent piping of each treatment skid) increases to the highdifferentialpressurevalueof25psi(whichcouldindicatesoliddepositsaccumulatinginthecarbonbed, forexample),analarmwillbedisplayedontheOITandtheOperatorwillbenotified.Thisisnotacriticalalarm,andtherefore,willnotautomaticallyshutoffthewellpump.
4.5.4 3-WayValves
Manufacturer/Model #ofPositions PowerVSI,Series1000ElectricActuator[1200] 2(on/off) AC120V/240VAC24
• Eachwellhead treatment system includes one (1) 3-way valve that can be controlledmanuallyatthevalve(usinganAllenhandleatthemanualoverridelocation),orusingthe electric actuator through the local OIT mounted to the front of the RTU controlpanelateachsite,orremotelyfromtheOITinthecentralcontrolroom(orviaremoteconnectiontotheOITinthecontrolroom).Innormaloperation,thevalvewillbeclosedonthebypasspipingandopenontheinfluentpipingtoeachtreatmentskid.
• To preventwater hammer, power-assisted closing/opening of valve is paced to occurover a 120-second period (i.e., over 2X safety factor based on the manufacturer’sspecifications)whenchangingfromnormaloperationtobypassmode,or frombypassmodetonormaloperation.
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• For temporary changes in flow between treatment and bypass, the Operator maymanuallyopen/closethebypassvalveuntilthedesiredflowratesareobtained(usinganAllen handle at the manual override location). The manual opening/closing of thebypassvalveisconductedatacontrolledratetopreventwaterhammer.
4.5.5 SumpsandLevelSwitches
Manufacturer/Model #ofFloats OrderNo./SwitchTypeDwyer,MercoidSeriesFSW2Free-
FloatingLevelSwitch2(high/high-high) FSW2-ONPN-20/SPSTNO
FSW2-CNPN-20/SPSTNC
• Theconcretepadsateachsiteareconstructedwithapproximate6-inchbermsalongthepad perimeter to contain and prevent release of water and the pads slope slightlytowards the collection sump(s) to facilitate collection and detection of any incidentalrainfallorsystemleakage.
• Thewellhead treatment systemsatRID-92andRID-95eachhaveonesumpequippedwithtwo(2)levelsensors/switches.
• The RID-89 and RID-114 wellhead treatment systems each have two sumps, bothequippedwithtwo(2)levelsensors/switchesthatoperateindependently.
• Eachsump iscoveredbyagrateconforming toMaricopaAssociationofGovernments(MAG)detail539.
• TheOperatorwill inspecteachsumponaweeklybasis for theaccumulationofwaterandifpresent,willdeterminethesource.
• Whenwater(e.g.,rainwaterorprocesswaterfromsamplingormaintenanceactivities)accumulatesinasump,ahigh-levelswitchalarmwillresultwhenwaterreachesthefirstfloat alarm point. The Operator will be notified and the sump pump(s) will startautomaticallytodischargethewateruntilthewaterleveldropstobelowthefirstfloatalarmpoint.Iftheaccumulationofwaterreachesthesecondfloatalarmpoint,ahigh-highcriticalalarmwillresultinanothernotificationtotheOperator,andthewellpumpwillautomaticallyshutoff. For thiscriticalalarm, theOperatorwill followthesystemupsetnotificationsproceduredescribedinSection4.1.
• The water contained in the sump will be discharged via 1 ½” to 2” galvanized steelpipingbya¾horsepowerpump(ratedfor50gpm)tothedischargestructure/receiverboxatthewellsite.
4.5.6 SCADASystemEach wellhead treatment system site is equipped with a wireless transceiver that allowscommunicationwiththecontrolroomatRID-95,whichservesasthecentralhubfortheSCADAsystem. Screen shots of the SCADA system are included inAppendixG. A summary of the
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SCADAsystemalarmconditions is includedbelow. The low-lowflowratecriticalalarmvaluefor each skid is calculated as 75% of the flow rate from thewell divided by the number oftreatment skids for that site. TheOperatorwill benotified for eachalarmcondition. Othercriticalandnon-criticalconditionsareasdescribedinprevioussections.
Condition AlarmValue
RID-89Low-LowFlowRate-3TreatmentSkids(Critical)
RID-92Low-LowFlowRate-1TreatmentSkid(Critical)
RID-95Low-LowFlowRate-2TreatmentSkids(Critical)
RID-114Low-LowFlowRate-3TreatmentSkids(Critical)
75%ofthewellflowratedividedbythe
numberoftreatmentskids
TreatmentSkidDifferentialPressure(Non-Critical) 25psi
HighLevelinSump(Non-Critical) Firstfloat
High-HighLevelinSump(Critical) Secondfloat
HighTemperature(Non-Critical) 120°F
4.5.7 TemperatureSensors
Manufacturer/Model ProductNo.Siemens,4-20mARoomTemperatureSensor
536-753(20to120°F)
• Temperaturesensorsareinstalledatallthewellheadtreatmentsystems.• Thesensorsmonitorthecabinettemperaturecontainingthecontrolhardwareandthe
temperature inside of the RID-95 control room. If the alarm value 120 degreesFahrenheit (°F) is exceeded, the Operator will be notified, but no change in theoperationalstatusofthesystemwilloccur.
4.5.8 SiteSecuritySitesecurityateachwellheadtreatmentsystemsiteincludes:
• Newlightingfixturesthatcomplywithlocalnightskyordinance.• New wrought-iron fencing and access gates set-up with electronic sensing alarms
(exceptatRID-92).
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• Keysforthelocksateachwellsiteaccessgatewillbeprovidedtoapproved/authorizedpersonnelonly(Note:somelocksaredaisy-chainedtoallowaccessbySaltRiverProjectpersonneltoreadtheelectricalmeters).
• Secureaccesstoelectricalequipment.• Cameras for 24-hour site surveillance. Cameras can be remotely operated (including
pan/zoomcapability)ontheSCADAcomputertoassisttheOperatorinrapidassessmentofsystemconditions.
4.5.9 SystemOperationUpsetEventsAn unscheduled shutdown of the wellhead treatment systems may occur due to variousreasons,whichinclude(butarenotlimitedto)thefollowing:
• Power Outage – power supply outages may occur as a result of lightning storms,downedpowerlines,downtransformer,etc.Ifanyofthetreatmentsystemshavealossofpower,thesystemwillautomaticallyrestartthewellpumponetime,inbypassmode.Intheeventofapoweroutage,aback-uppowersupplywillallowfortheSCADAsystemtoremainoperational,andtheOperatorwillbenotifiedofthealarm.TheOperatorwillneed to physically visit the treatment system to inspect the cause of the alarm,coordinaterestorationofpowersupplyatthesite,andrestartthetreatmentsystem.
• Heavy Rain – as indicated in Section 4.5.5, each sump is equipped with a two-levelsensor/switch.Intheeventthataheavyrainstormcausesaccumulationofrainwaterinasumptoreachthesecondfloat(triggeringahigh-highcriticalalarm),theOperatorwillbenotifiedandthewellpumpwillautomaticallyshutoff.
• CriticalAlarms–thereareanumberofalarmconditions(summarizedinSection4.5.6),thatwhentriggered,willresultinanautomaticnotificationtotheOperator.However,twotypesofcriticalalarms(i.e., low-lowflowrateforeachtreatmentskidandahigh-highlevelinasump),willautomaticallyshutoffthewellpump.
Please refer to Section 4.1 for notification procedures for wellhead treatment system upsetevents.
4.6 SAMPLINGANDANALYSIS
Thissectionprovidesthemethodsandprocedurestocollectandanalyzewellheadtreatmentsystemsamples.
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4.6.1 PurposeofSamplingandAnalysisProgram
Thegoalofthesamplingandanalysisprogramistocollectdatato:
• DeterminecompliancewiththewaterqualityTreatmentGoalsforthetargetCOCs;• Determine when LGAC bed breakthrough/exhaustion occurs and LGAC change-out is
needed;and,• Determine the approximate mass of target COCs being removed at each wellhead
treatmentsystem.
4.6.2 FrequencyandLocationsofSamplingThe proposed data collection/sampling programs are presented in the matrix below. Thelocation and frequency of each sample will be conducted for each of the individual LGACtreatmentskids.Samplingfrequencyandlocationsreferonlytothe“lead”vesselexceptwherenoted.
WellheadTreatmentSystemSamplingProgramMatrix
LOCATION FREQUENCY
WeeklyInfluentSamplePort@Wellhead Monthly*
WeeklyMid-SkidSamplePort
Monthly*Pointof
Compliance(POC)Weekly
Theasterisknexttoeach“Monthly”indicatesthatachangetothisfrequencywillbebasedonan evaluation of “Weekly” data and may be changed after the treatment system reachessteady-state (if agreed to in advance by ADEQ). Sampling will revert to “Weekly” shouldsignificantvariationorunanticipatedresultsbeobserved.The POC sample ports (installed at the 14-inch discharge piping, located downstreamof thetreatment skidsand immediatelyupstreamofeach receiverbox, seeFigures3-6)will be thelocation for demonstrating that the treatment system achieves the Treatment Goals for thetarget COCs described in Section 2.4. Field quality control (QC) sampleswill be collected asdescribedinSection4.6.4.
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4.6.3 SamplingMethods
Thefollowingsectionprovidesdetailsregardingthemethodsthatwillbeusedforthewellheadtreatment system sampling program. Sampling will be conducted consistent with theprovisionsoftheHealthandSafetyPlan,includedasAppendixH.SamplingEquipment&ProcedurePriortosamplecollection,eachsamplingportwillbepurgedforapproximately15-30secondstoremoveanystagnantwater(i.e.,non-representativewater).Purgewaterfromtheinfluentand effluent sample ports will be collected in a two (2) gallon bucket, andwill be disposedwithinthetreatmentsystemconcretecontainmentstructure.Each water quality sample will be collected in a set of two (2) 40-milliliter volatile organicanalysis (VOA)vialspreservedwith1:1hydrochloricacid (HCl).Sampleswillbecollectedwithzeroheadspace.EachVOAvialwillbetiltedtoapproximately45degreesofvertical,andfilledusingalowflowrate(i.e.,approximately250millilitersperminuteofsample).Thevialwillbefilledtothebrimandthen,usingthecap,asmallamountofwatershallbeaddeduntilaconvexmeniscusisformed.Thevialwillthenbecapped,turnedupsidedown,andtappedtoverifynoheadspace. Sampleswillbestoredinacoolerwithwet iceat4°Celsius(C),±2°C,andhanddeliveredtotheanalyticallaboratory.
4.6.4 AnalyticalMethodsandProceduresSampleswill be analyzed followingprotocols that includequality control (QC)provisions andsampledocumentationandmanagementpracticesasdescribedinthefollowingsections.SampleAnalysesWater samples will be analyzed for VOCs following EPA Method 8260B and submitted toAirtechEnvironmentalLaboratories(AEL)ofPhoenix,Arizona.AELisanenvironmentaltestinglaboratory certified by ADHS under license number AZ0740. AELwill analyze for the six (6)WVBASiteCOCs.ThereportinglimitforeachCOCwillbe0.5microgramsperliter.
DataqualitycontrolpracticeswillbeinaccordancewiththeAELstandardoperatingprocedure(SOP) for analysis of VOCs by EPA Method 8260B (Appendix I). Standard quality controlrequires analysis of a Laboratory Control Sample (LCS), LCS duplicate, internal standard, andsurrogateanalyteswitheachsampleset.The8260Bmethodrequiresanalyticalaccuracytofall
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within a series of ranges of percent recoveries for internal standards and surrogates (seeAppendixI).Laboratoryduplicatesmustbelessthanorequalto20relativepercentdifference(RPD). Dataquality controloutsideof these limitswillbe re-run ifpossible,orappropriatelyflaggedwiththereportedresults.QualityControlQualitycontrolmeasureswillbeemployedtoevaluateboththefieldsamplingproceduresandtechniquesaswellasthelaboratoryproceduresandperformanceofinstrumentation.FieldQCsamples (includingtripblanksandfieldduplicates)willbecollectedtohelpevaluateconditions resulting from field conditions and activities. Field QC samples may be used toevaluatevariabilityinenvironmentalsamplingandanalysisoforganiccontaminants.Fieldduplicatesampleswillbecollectedandtreatedindependentlyofitscounterpartinordertoassessfieldsamplingproceduresandlaboratoryprecisionandaccuracy,throughcomparisonoftheresults,andcollectedatafrequencyofone(1)persamplingevent. Duplicatesampleswill be preserved, packaged, and sealed in the same manner as the primary samples. Aseparate sample number and identification will be assigned to the duplicate, and it will besubmitted blind to the laboratory. Identity of the duplicate samplewill be recorded on theWeeklyOperationandMaintenanceInspectionForm(AppendixJ).Trip blank samples are used to determine if VOC water samples have been contaminatedduringtransport fromthe field to the lab. Thetripblanksarepreparedbythe laboratorybyfillingaVOAvialhead-space freewithorganic freewater,preservedwith1:1HCl, labeledas“TripBlank”or“TB”withthepreparationdateincludedonthecustodyseal.Tripblankswillbeincludedineachcoolerusedtotransportwatersamplestothelaboratory.Theresultsofthetrip blanks are a key aspect of the overallQC system for the sampling program, andwill beincludedintheanalyticalresultsreport.Laboratory quality control samples are certified standards analyzed by the laboratory(includingmatrixspikesamplesandduplicates)todemonstrateaccuracyonadailybasis.Sincesamples to be used as matrix spikes are randomly selected by the laboratory analyst afterreceiptofsamples, it isunderstoodthatsuchanalysesmayormaynot includesamples fromanygivensamplingeventorlocation.Laboratoryprocedureswillbeevaluatedusingfieldduplicatesamples,matrixspikesandotherinternalproceduresdefinedbytheanalyticalmethodandanalyticallaboratory.
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SampleDocumentationandManagementChain-of-custodyrecordsarecompletedforeachsamplingevent.Thechain-of-custodyrecordwill be completed as samples are collected. An example chain-of-custody record for AEL isprovidedasAppendixKandwillaccompanythesamplestothelaboratory.Informationtobeenteredoneachchain-of-custodyrecordincludes:
• Projectname• Projectmanager/contactperson• Printednameofsamplerandsignature• Dateandtimeofcollection• Samplematrixidentification• Numberofcontainerscollectedforeachsample• Sampleidentification• Analysesrequested• Turn-around-timerequested• Datesofpossession• Nameandsignatureofpersonrelinquishingsamples• Dateofsamplereceipt• Timeofsamplereceipt• Nameandsignatureofpersonreceivingthesamples• Remarkspertinenttosamplecollection,preparation,preservation,andanalyses
Samples will be submitted as soon as possible (i.e., on the date of sampling) to AEL withrequested turnaround time of five (5) days and VOC analyses following EPAMethod 8260B,whichhasaholdtimeof14days.All documentationwill bemade in indelible ink. Correctionswill bemadebydrawing a linethrough the error and entering the correct information. Both the error and the correctinformationmustbelegible.Thepersonmakingthecorrectionwillinitialthedocumentwherechangesaremade.
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5.0 SPENTGACMANAGEMENT
Foreachwellheadtreatmentsystemsite,spentGACmustcurrentlybeprofiledeverytwoyearsby the carbon vendor. Synergy will coordinate the profiling process, contacting the carbonvendor a minimum of six weeks prior to an anticipated carbon change-out so that a grabsampleofspentGACcanbecollectedandanalyzed.Thegrabsampleshallbecollectedbythecarbon vendor using a 16-ounce glass jar (or similar) by accessing the 14-inch by 18-inchelliptical man-way located at the top of each vessel (see Section 8.0 of the Siemens O&MManual inAppendixE).Followingsatisfactorycompletionof theprofilingprocess, spentGACcanberemovedandtransportedoff-sitetoareactivationfacilityprovidedtheprofileindicatestheGACasnon-hazardous.AllhistoricalprofileshaveindicatedspentGACfromthewellheadtreatment systems were non-hazardous. All profile records will be maintained in the FieldOfficeatRID-95.
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6.0 DOCUMENTATIONANDREPORTING
Thissectionincludestheongoing,periodicdocumentationandreportingnecessaryforeffectivemonitoringofthewellheadtreatmentsystems.
6.1 WEEKLYINSPECTIONFORMS
Inspections will be conducted once per week to monitor the operational and physicalconditions at each wellhead treatment system. A blank inspection form is included asAppendixJ,andprovidesforcollectingdatarelatedtowaterflowrates;operatingpressuresatthe wellhead and across the treatment vessels, alarms, and equipment inspections andmaintenance/repairs. The Operator will complete the form during each inspection. Allinspection data and information will then be uploaded to the operations database for thewellhead treatment systems. The inspection formwill be reviewedannually (at aminimum)andupdatedasappropriate.
6.2 MONTHLYPROGRESSREPORTING
For eachmonth that the wellhead treatment systems are in operation, aMonthly ProgressReport will be prepared to document remedy progress. RID will provide ADEQ’s RemedialProjectsUnitwithone(1)hardcopyandone(1)electroniccopyofeachReportbythe15thofthemonththatfollowsthereportingperiod.AnexampleofatypicalMonthlyProgressReport(excluding copies of the final laboratory reports) is provided asAppendix L. EachMonthlyProgressReportwillincludethefollowing,ataminimum:
• ApproximatemassoftargetCOCsremovedandgroundwatervolumetreatedduringthereportingperiod,andcumulativetotaloftargetCOCsremovedandgroundwatervolume treated since system start-up for each treatment system and total for allsites;
• Tabular summary of wellhead treatment system samples collected and analyticalresultsforthereportingperiod;
• Copiesoffinallaboratoryreportsforthereportingperiod;
• Operational hours/percentage for each wellhead treatment system during thereportingperiod;
• Datesofcarbonchange-outsconductedduringthereportingperiod;
• Summaryofanymalfunctionswhichcausedthewellheadtreatmentsystemstobeofflineduringthereportingperiod;
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• Summary of the maintenance activities performed to correct those malfunctionsduringthereportingperiod;
• Summary of system operation upset events (see Section 4.1) reported to ADEQduringthereportingperiod;and,
• Copiesoftheweeklyinspectionformsduringthereportingperiod.Themost recentMonthlyProgressReports (withoutvoluminousanalytical laboratory results)are available on the West Valley Groundwater Cleanup Coalition website(http://www.wvgroundwater.org),underthe“ProjectDocuments”tab.
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7.0 KEYCONTACTSLIST
Keycontactsforthewellheadtreatmentsystemsinclude:RooseveltIrrigationDistrict–DonovanNeese,PE KenCraigSuperintendent WaterOperationsManagerEmail:[email protected] Email:[email protected]:(623)670-4760 Phone:(623)695-5855AgencyOversight–ScottGreenArizonaDepartmentofEnvironmentalQualityEmail:[email protected]:(602)771-1612Engineering/TechnicalSupport–ComplianceCoordinatorJoelPeterson,PESynergyEnvironmental,LLCEmail:[email protected]:(480)284-3518
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8.0 REFERENCESCITED
ArizonaDepartmentofEnvironmentalQuality(ADEQ),2010.ConditionalApprovalofaWater
QualityAssuranceFund(WQARF)EarlyResponseAction(ERA)WorkPlanfortheWestVanBurenRegistrySite,June24.
__________, 2011. Reviewof RID-95WellheadPilot Treatment SystemProposalWork Plan,
WestVanBurenWaterQualityAssuranceRevolvingFundRegistrySite,September2.__________,2013. ConditionalApprovalofRID’sModifiedEarlyResponseActionWorkPlan,
WestVanBurenWQARFRegistrySite,Phoenix,Arizona,February1.__________,2015.DraftFeasibilityStudy–RooseveltIrrigationDistrict,April13.Montgomery & Associates, 2010. Work Plan, Roosevelt Irrigation District Early Response
Action,WestVanBurenWaterQualityAssuranceRevolvingFundSite,February3.SynergyEnvironmental,2011a.EarlyResponseAction-PublicHealthExposureAssessmentand
MitigationWork Plan,WestVanBurenAreaWaterQualityAssuranceRevolving FundSite,June16.
__________,2011b.EarlyResponseAction-PublicHealthExposureAssessmentandMitigation
SummaryReport,WestVanBurenAreaWaterQualityAssuranceRevolvingFundSite,September16.
__________,2011c.RID-95WellheadPilotTreatmentSystemProposal,WestVanBurenArea
WaterQualityAssuranceRevolvingFundSite,August18.__________,2012a.1-MonthTechnology/DesignDemonstrationReport:RID-95PilotSystem,
WestVanBurenAreaWaterQualityAssuranceRevolvingFundSite,May8.__________,2012b. ModifiedEarlyResponseActionProposalForTheWestVanBurenArea
WaterQualityAssuranceRevolvingFundSite,July17.__________, 2012c. Modified Early Response Action Work Plan, West Van Buren WQARF
RegistrySite,Phoenix,Arizona,October19.__________, 2012d. Long-Term Operational Assessment Report, RID-95 Wellhead Pilot
TreatmentSystems,WestVanBurenWQARFRegistrySite,Phoenix,Arizona,April5.
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__________,2014a.DraftFeasibilityStudyReport,WestVanBurenAreaWQARFSite,July15.__________,2014b.RevisedDraftFeasibilityStudyReport,WestVanBurenAreaWQARFSite,
November26.Terranext,2012.RemedialInvestigationReport,WestVanBurenWQARFRegistrySite,Phoenix,
AZ,preparedforADEQ,August.