re: proposed changes to the operation and maintenance plan, … · 2016. 2. 9. · arizona...

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

2

OPERATION&MAINTENANCEPLAN-RIDWELLHEADTREATMENTSYSTEMS,REVISION6

WESTVANBURENAREAWQARFSITE

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

3



TABLEOFCONTENTS(Continued)

TABLES

Table

1 SummaryofRecentWaterQualityData–TreatmentSystemWells

2 SummaryofWellConstructionInformation,RooseveltIrrigationDistrict

WellheadTreatmentSites

FIGURES

Figure

1 SiteLocationMap

2 SiteMapandVicinity

3 PipingandInstrumentationDiagram,RID-89WellheadTreatmentSystem




APPENDICES

Appendix

A RID-89WellheadTreatmentSystemDrawings

B RID-92WellheadTreatmentSystemDrawings

C RID-95WellheadTreatmentSystemDrawings

4




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]

5



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

6



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

7



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,

8



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.

9



• 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

10



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.

11



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:

12



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

13



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

14



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.

15



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).

16



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

17



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





Notes:

psi=poundspersquareinch

gpm=gallonsperminute

Deleted: PUMP

18



RID-92

ParameterNormal

OperatingValue


WellheadPressure(Treatment) 21psi

FlowRate(Bypass) 1,400gpm


Skid1Post-LeadVesselPressure 2.0psi


RID-95

ParameterNormal

OperatingValue









RID-114

ParameterNormal

OperatingValue










19




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

20



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

21



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.

22



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)


RID-92andRID-95

AlertLevel: 1.5µg/L TCEorPCE 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.

23



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




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.

24



• 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

25



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).

26



• 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.

27



• 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.

28



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)



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:

29



• 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

30



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.

31



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.

32



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.

33



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.

34



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.

35



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;

36



• 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.

37



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


Phone:(602)771-1612

Engineering/TechnicalSupport–ComplianceCoordinator

JoelPeterson,PE

SynergyEnvironmental,LLC


Phone:(480)284-3518

Deleted: WellheadTreatmentSystems

Owner/Operator–

JimMadole,PE TerryBlood

President Operator

SpinnakerHoldings,LLC Spinnaker

Holdings,LLC

Email:[email protected] Email:

[email protected]

Phone:(602)810-2105 Phone:(480)

231-6509

38



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

39



__________, 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

OPERATION&MAINTENANCEPLANRIDWELLHEADTREATMENTSYSTEMS,REVISION7


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

ii




TABLES

Table

1 SummaryofRecentWaterQualityData–TreatmentSystemWells

2 SummaryofWellConstructionInformation,RooseveltIrrigationDistrict

WellheadTreatmentSites

FIGURES

Figure

1 SiteLocationMap

2 SiteMapandVicinity





APPENDICES

Appendix

A RID-89WellheadTreatmentSystemDrawings

B RID-92WellheadTreatmentSystemDrawings

C RID-95WellheadTreatmentSystemDrawings

iii




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

1



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

2



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

3



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.

4



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.

5



• 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

6



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.

7



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.

8



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

9



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

10



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.

11



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).

12



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

13



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

14



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

15



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

17



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-92Low-LowFlowRate-1TreatmentSkid(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

28



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.