EXHIBIT A

EXHIBIT A

EXHIBIT A

EXHIBIT A

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December 24, 2019

Mauryn McDonald, PEChief EngineerGuam Waterworks AuthorityGloria B. Nelson Public Service Building688 Route 15Mangilao, Guam 96913

Attention: Garrett Yeoh

RE: Change Proposal 02 for Design Services for GWA’s Pressure Zone Realignment and TankRepair/Replacement, GWA Project W18-001-BNDWater Loss Control Program Development

Dear Ms. McDonald:

GHD is pleased to submit this change proposal to amend our Scope of Work and Fee for the Pressure ZoneRealignment and Tank Repair/Replacement (Pressure Zone Realignment) project. This scope of workdefines the additional design services GHD and our subconsultant, Water Systems Optimization, Inc.(WSO), will provide for Phase 3 of the Water Loss Control Program. More specifically, the design serviceswill include the development of a plan to implement District Metered Areas (DMA) island-wide and theconstruction documents to execute four sites that resulted from the DMA Conversion report prepared byWSO and delivered to GWA November 2019. The original project scope will be amended on a lump sumbasis per the fees in the table below.

SCOPE OF WORK

The first step will be the Phase 3 Water Loss Control Program Development to be prepared by WSO. Thedetailed scope of work, dated October 2019, is attached. The plan will include identification of DMAinfrastructure requirements to implement the DMAs in Task 4 of the attached scope of work. GHD willprovide project oversight and coordination between the original Pressure Zone Realignment scope ofwork. Efforts will be coordinated with the design and construction documents of the Pressure ZoneRealignment in the determination of DMAs. GHD will review the infrastructure requirements identifiedunder Task 4 of the WSO scope of work for suitability with GWA’s water system and the climate onGuam.

Secondly, GHD will prepare construction documents to execute the infrastructure requirements to convertfour temporary DMAs under Phase 2 of the WSO original scope to permanent DMAs. The design willfollow the recommendations in the report “DMA Conversion – Recommendations for Conversion of the

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Temporary DMAs to Permanent DMAs.” The four DMAs are Asan-Piti, Mataguac, Nimitz Estates, andWindward-Talafofo. These recommendations included battery-powered flow meters, data loggers andM2M data transmission that do not communicate with GWA’s SCADA system. No electrical or SCADAdesign will be provided under this scope of work. The documents will include specifications, plans, costestimates, and bid forms necessary for bidding and permit submittal to DPW. The documents will beintegrated with construction documents for a phase of the Pressure Zone Realignment. GHD will prepareand submit the following: Multidiscipline plans at 30%, 60%, 90%, and Final completion levels per the requirements for

Pressure Zone Realignment. Construction cost estimate based on the 60% and 100% design plans and specifications. These

estimates will be Class 3 and 2 respectively in accordance with the AACE International CostEstimate Classification System.

GHD shall coordinate with Guam Environmental Protection Agency and Department of PublicWorks at the 90% submittal. This includes submitting 11x17 plans, one meeting with each, andincorporating any relevant regulation requirements in the design.

ASSUMPTIONS AND EXCEPTIONS This change proposal only applies to the scope of work and contract amount. The terms of the

original executed agreement still apply. The scope to prepare construction documents for the execution of the infrastructure

improvements for permanent DMAs is limited to the specific sites listed above. If infrastructurerequirements are needed for more sites, GHD will negotiate a fee adjustment.

GHD’s scope of work assumes that existing conditions are accurately defined by WSO andSCADA and electrical design are excluded. The fee will be renegotiated for design changes basedon differing conditions from those defined by WSO.

Property and right-of-way research and acquisition will be provided by GWA. Survey services are excluded. It is assumed that the existing site conditions can be prepared based

on field hand measurements, utility locations from aboveground utility appurtenances, and as-built drawings.

Construction Bid Support Services are excluded. Construction Management Services are excluded.

The fee will be adjusted accordingly if designs are needed at less than 30 sites or less than fourdifferent sets of contract documents are prepared for bidding. The fees for specifications and bidplans apply if the documents are combined into a set with improvements from the originalPressure Zone Realignment scope of work.

FEE SCHEDULE FOR ADDITIONAL DESIGN SERVICESTASKS TOTALS

Original Contract Amount $2,511,097WSO fee and GHD markup $287,500

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GHD Project Management and Coordination $14,800GHD Construction Documents 4 sites at $11,000 each Enclosure Detailing $4,000 Specifications Additions $2,500 Cost Estimates $2,400

$52,900

Subtotal Cost $355,200Guam GRT (at 5.2%) $18,470TOTAL CHANGE PROPOSAL COST $373,670AMENDED CONTRACT AMOUNT $2,884,767

Work that exceeds the scope of this proposal will be brought to your attention for review, approval andfee adjustment. Work performed will be billed monthly based on the estimated percent complete. Westand ready to provide the professional services necessary to assist GWA in this endeavor.

Sincerely,

Aaron Sutton, PE, ENV SPProject Manager

Attachments: WSO Phase 3 Water Loss Control Program Development Proposal, October, 2019

Cc: file

GUAMWATERWORKSAUTHORITY

Phase3WaterLossControlProgramDevelopment

WATERSYSTEMSOPTIMIZATION,INC.

PROPOSALSUBMISSIONOCTOBER,2019

ELECTRONICALLYSUBMITTED

COVERLETTEROctober18,2019

TO:GHD-GuamAttn:Mr.AaronSutton,P.E.GHDGuamOfficeManager

FROM:WaterSystemsOptimization,Inc.131KisslingStreetSanFrancisco,CA94103Tel:415-533-0419

DearMr.Sutton,

After successful completion of Phase 1 and 2 of the GuamWaterworks Authority (GWA)Water LossControlProgramwearepleasedtosubmitthisscopeforPhase3asrequestedduringrecentmeetingswithGWAstakeholders.

Phases 1 and 2 have confirmed that there is a strong case for substantial cost recovery through theimplementationofacomprehensivewaterlossreductionprojectinGWAsdistributionnetwork.

In Phase 3, WSO will develop a water loss control program for GWA based on the island-wideimplementationofDistrictMeteredAreas,anapproachprovensuccessfulduringPhase2.Theaimistoprovidealong-term,sustainableandholisticapproachtomonitoringandmanagingwaterlosseswithintheGWAwatersupplyanddistributionnetwork.

OurprojectteamwholeheartedlybelievesthatweareuniquelypositionedtoprovidethebestservicetoGWA and its customers.Water SystemsOptimization (WSO) respectfully submits the enclosed scopewiththeintentionthatalloftherequiredinformationissupplied.WSOwillhappilyprovideanyfurtherclarificationifneeded.

If you have any questions, please do not hesitate to contact me at (786) 877-5752 or by email atreinhard.sturm@wsoglobal.com.

Sincerely,

ReinhardSturmCEO/President–WSO

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

Contents CoverLetter.................................................................................................................................................2

1 Phase3:WaterLossControlProgramDevelopment............................................................................3

ProjectApproach&Understanding.........................................................................................................3

2 Phase3:ScopeofWork.........................................................................................................................4

Task1:ReviewofExistingPlansandModels...........................................................................................4

Task1A:ZoneRealignmentPlanandPhasing.....................................................................................4Task1B:HydraulicModel....................................................................................................................4Task1C:GIS.........................................................................................................................................4Task1D:PressureReducingValve(PRV)Rehabilitation/ReplacementPlansandanyotherrelevantCIPprojects..........................................................................................................................................4

Task2:IdentificationofPotentialDMAs.................................................................................................5

Task2A:DeskStudy.............................................................................................................................5Task2B:SiteVisittoPotentialDMAInletLocations............................................................................5Task2C:SiteVisittoPotentialDMABoundaryLocations....................................................................5Task2D:SiteVisitallabove-groundinfrastructureineachpotentialDMA........................................5Task2E:Non-intrusiveDMAInflowMeasurementandPreliminaryWaterLossAssessment............6Task2F:DMAPressureDataCollection...............................................................................................6Task2G:ZeroPressureTests...............................................................................................................6

Task3:CustomerIdentificationperDMA...............................................................................................6

Task4:IdentificationofDMAInfrastructureRequirements...................................................................7

Task5:PrioritizationofProposedDMAs.................................................................................................7

Task6:DevelopDMAImplementationPlan............................................................................................7

Task7:DevelopDraftScopesforImplementationProjectContractingElements..................................7

3 ProjectManagementandReporting.....................................................................................................8

4 ProjectScheduleandCost.....................................................................................................................9

ProjectSchedule......................................................................................................................................9

ProjectCost...........................................................................................................................................10

AppendixA–ProjectOrganizationalChart...............................................................................................11

TABLEOFTABLES

Table1:ProposedProjectSchedule,OrganizedbyTask.............................................................................9

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

1 PHASE3:WATERLOSSCONTROLPROGRAMDEVELOPMENT

ProjectApproach&Understanding

During the Phase 2 Pilot Project, the direct measurement of water losses in three pilot temporaryDistrictMeteredAreas(DMAs)supportedandconfirmedtheresultsfromthePhase1top-downwateraudit-thatphysicalwaterlossfromleakingpipesisthemajorcomponentofwaterlossforGWA.

In Phase 3 WSO will develop a water loss control program for GWA based on the island-wideimplementation of DMAs. The aim is to provide a long-term, sustainable and holistic approach tomonitoringandmanagingwaterlosseswithintheGWAwatersupplyanddistributionnetwork.

DMAsallowthedirectmeasurementofwater losseswithinthewaternetworkandcanbeusedtosettargetsforwaterlossreductionattheDMA,supplyzoneandsystem-widelevel.WithineachDMA,leakdetection and repair will be carried out to reduce water losses from detectable leaks and, wherenecessary, pressure within the DMA will be managed downwards to further reduce losses frombackground leaks. A DMA monitoring system will provide for the automated calculation of monthlywaterlossvolumewithineachDMA.ThisallowsDMAstoberankedinpriorityorderaccordingtotheirvolumeofwater loss.The long-termaimwillbe toreducethewater lossvolume ineachDMAtotheoptimum economic level and to focus water loss control activity in those DMAs where water lossincreasesabovetheeconomiclevel.ThisapproachwillensurethatGWAreducesthecurrentmarkedlyhighwater-losslevelandhasinplaceasystemtomanagefuturewaterlosslevelsatthemosteconomiclevel.

The requested services include the development of a DMA implementation program that takes intoaccount the ongoing pressure zone realignment program and other relevant CIP and operationalprograms.

WSOproposesthefollowingstepstodevelopaDMA-basedwaterlosswatermanagementprogramforGWA.

1. ReviewexistingzonerealignmentandCIPplansandhydraulicmodels.

2. Identify potential DMAs to provide maximum coverage of the water supply and distributionnetwork.

3. Identify the GWA customers inside each potential DMA to assess for DMA size and waterdemand.

4. Identify DMA infrastructure requirements and costs including requirements for DMA meterpoints,chambers,boundaryvalves,telemetry/SCADAandpressuremanagement.

5. ProduceaprioritizedrankingofpotentialDMAsbyease/leastcostimplementation.

6. DevelopaphasedDMAimplementationplan(3to5-yearplan).

7. Producedraftscopesforthevariousprojectimplementationelements(design,constructionandmanagement).

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

2 PHASE3:SCOPEOFWORK

Task1:ReviewofExistingPlansandModels

Task1A:ZoneRealignmentPlanandPhasing

ReviewZoneRealignmentPlan

WSOwill reviewtheongoingzonerealignmentplantounderstandthecurrentandproposednetworkconfiguration, aswell as the associated realignment tasks (newPRVs etc.). WSOwill also review thephasingofthezonerealignmentworkinordertounderstandthesequenceinwhichthezonesarebeingrealigned.ThiswillfeedintothelatertaskwheretheDMAImplementationPlanisdeveloped.

Task1Aoutcomes:

• Understandingofthecurrentandproposednetworkconfiguration• Understandingoftheorderinwhichthepressurezonesarebeingrealigned

Task1B:HydraulicModel

ReviewHydraulicModelOutput

WSOwill reviewthecurrenthydraulicmodeloftheGWAnetwork, includingthefuturescenariosthatcoverthepressurezonerealignment.Thiswillimprovetheunderstandingofhowthecurrentnetworkconfiguration isperformingandwhateffects theproposedpressurezone realignmentworkwillhave.ThemodelcanalsobeusedtotesttheproposedDMAsthatareidentifiedinTask2.

Task1Boutcomes:

• Utilization of the hydraulic model to assist in understanding the performance of the currentnetworkconfiguration

• Utilizationofthehydraulicmodeltoassistinunderstandingtheperformanceimprovementsbeingbroughtaboutbytheproposedpressurezonerealignmentwork

• PrepareforutilizationofthehydraulicmodeltotestpotentialDMAs

Task1C:GIS

ReviewcurrentGISrecords

ObtainlatestGISrecordsforthepipenetworkandcustomerlocationsforDMAdesign.

Task1Coutcomes:

• UtilizationofGISrecordsforDMAdesign

Task1D:PressureReducingValve (PRV)Rehabilitation /ReplacementPlansandanyother relevantCIPprojects

ReviewthePRVRehabilitation/ReplacementPlans

WSOwill reviewGWAsplans for rehabilitationand/or replacementofPRVsandallother relevantCIPprojects (pumpstationupgrades,newwells, etc.) toensure theseare taken intoaccount in theDMAidentificationphase.

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

Task1Doutcomes:

• UnderstandingofGWAsPRVrehabilitation/replacementplans• UnderstandingofrelevantCIPprojects

Task2:IdentificationofPotentialDMAs

Task2A:DeskStudy

WSOwillcarryoutadeskstudyutilizingthedataandunderstandinggainedinTask1toidentifyallthepotentialDMAs, includingthepotentialDMAinletpointsandboundaries. EachpotentialDMAwillbetestedusing thehydraulicmodel to ensure that it canbe implementedwithout impacting on servicelevels.

Task2Aoutcomes:

• DraftlistofpotentialDMAswithinletpointsandboundaries

Task2B:SiteVisittoPotentialDMAInletLocations

WSOwillcarryoutasitevisittoallpotentialDMAinletlocationstoidentifytheoptimalDMAinletmeterpointlocation.

Task2Boutcomes:

• DMAInletmeterLocationPointPlans.

Task2C:SiteVisittoPotentialDMABoundaryLocations

TheextentofeachDMAboundarywillbedeterminedbyinspectionofthepressurezonedetailsandthedistributionnetworkrecords.Thelocationofanyboundaryvalvewillbeidentified.Allboundaryvalveswillbelocatedandtestedforoperationincludingwhetheritcanprovideawater-tightshutwhenclosedoffandtestedforoperation.Shouldaboundaryvalvebefoundtobeinoperableorpassing,itwillneedto be replaced with a new boundary valve. Any boundary valve that cannot be located will needexcavatingtoenabletesting.

Task2Coutcomes:

• DMAboundaryvalveplans, including listofvalvesthatneedtobereplacedandnewvalvesthatneedtobeinstalled

Task2D:SiteVisitallabove-groundinfrastructureineachpotentialDMA

Theabove-groundinfrastructure(watertanksandpumpingstations) ineachDMAwillbeinspectedtodetermine what additional measurement devices (water level, inlet and outlet flow) are required toensure that theDMAwaterbalancecanbecorrectlycalculated.This isparticularly relevant forwatertankswithinaDMAwherewaterstorageincreases/decreasesmustberecognizedtocorrectlycalculatewaterlosses.

Task2Doutcomes:

• Identification of additional measurement requirements at above-ground infrastructure in eachDMA

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

Task2E:Non-intrusiveDMAInflowMeasurementandPreliminaryWaterLossAssessment

Where possible, theDMA inflowwill bemeasured using non-intrusive techniques (logging of existingmeters and/or use of clamp-on ultrasonic flow meters). This will enable a preliminary water lossassessmentforthepotentialDMAtobecarriedout.

Task2Eoutcomes:

• DMAInletflowmeasurement(wherepossible)• DMAWaterLossAssessmentwhereinflowmeasurementispossible

Task2F:DMAPressureDataCollection

Pressure data will be collected in each potential DMA using both normal and high-frequency dataloggerstoassessthepressureprofileanddeterminethescopeforpressuremanagementintheDMA.

Task2Eoutcomes:

• DMApressuredata• IdentificationofscopeforpressuremanagementintheDMA

Task2G:ZeroPressureTests

Wherepossible,aZeroPressureTest(ZPT)willbecarriedoutinthepotentialDMA.Thisentailsclosingthemain inlet supply valve for the zone and recording the pressure at selected locationswithin thezone.AllboundaryvalveswillbemanuallysoundedduringtheZPTtomakesuretheyclosetightlyandarenotallowingwater topass into thezone. Should thezone fail theZPT (positivepressureremainswithin the zone) then extensive investigations will be needed to locate the zone breach. Additionalboundaryvalvesmayberequiredifzonebreachesareidentified.

Task2Eoutcomes:

• ConfirmedDMAboundary• Needforadditionalboundaryvalves

Task3:CustomerIdentificationperDMA

WSOwill utilize theexistingGWAcustomerbillingdata to identify thenumberof customers and thecurrent customer demand within each potential DMA. This will be used in the assessment of DMAwaterlossesforthoseDMAswheretemporaryinflowmeasurementhasbeenpossible.

Task3outcomes:

• NumberofcustomersineachpotentialDMA• CurrentcustomerdemandineachpotentialDMA

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

Task4:IdentificationofDMAInfrastructureRequirements

For each potential DMA, the infrastructure requirements needed to implement the DMA will beidentified,cataloguedandprovisionallycosted.Thesewillinclude:

• PreliminaryDMAmeterpointpipeworkdesignandcosting• PreliminaryDMAmeterpointchamberdesignandcosting• DMA boundary valve locations, including preliminary design for additional vales, where

necessary.• PreliminaryDMAtelemetry/SCADArequirements• Additionalpressuremanagementrequirements

Task4outcomes:

• CompletelistofallDMAinfrastructurerequirementswithpreliminarydesignandcostings

Task5:PrioritizationofProposedDMAs

WSO will produce a priority ranking of the potential DMAs by ease of implementation and capitalinvestmentneeded(leastcostfirst). ThiswilldrivetheDMAImplementationPlanwiththeDMAsthatareeasiesttoimplementandhavelowestcapitalcostrequirementbeingdonefirst.

Task5outcomes:

• PrioritizedlistofpotentialDMAsrankedbyeaseofimplementation

Task6:DevelopDMAImplementationPlan

Theprioritized listofpotentialDMAswillbeusedtodevelopa3-year to5-yearDMA implementationplan.Theplanwilltakeintoaccountthepressurezonerealignmentwork.Theplanwillsetoutindetailthe requirements for each DMA in terms of construction requirements, boundary valve operation,telemetryandSCADArequirements,andadditionalpressuremanagementrequirements.

Task6outcomes:

• DMAimplementationPlan

Task7:DevelopDraftScopesforImplementationProjectContractingElements

WSOwilldevelopdraftscopeofworksfortheImplementationProjectcontractingelements.

Task7outcomes:

• DraftScopeforConstructionDesignandSpecifications• DraftScopeforWaterLossControlManagementincludingDMAboundaryimplementation,leak

detection,pressuremanagementandongoingmonitoringofDMAwaterlosslevels• DraftScopeforLeakRepairworks

WSOScope:GWAPhase3WaterLossControlProgramDevelopment

3 PROJECTMANAGEMENTANDREPORTING

InordertoensurethattheprojectmeetsGWAWSD’sexpectationsandtimeline,theprojectteamwillscheduleappropriatemilestonemeetingstodiscussprojectfindingsandscheduling. Inadditiontotheproject milestone meetings, the project team will schedule individual meetings with variousdepartments and stakeholders as necessary. Monthly progress reports will accompany the monthlyinvoicethatWSOwillprepare.

After completing all tasks, the project team will develop a final report that includes an executivesummary,adescriptionofthestudyprocess,allanalysesconducted,andfindingsandrecommendationsfor implementing GWA’swater loss control program. Prior to submittal of the final report,WSOwillprepareadraftreportforGWAstaffreviewandincorporatecommentsreceivedfromGWAinpreparingthefinalreport.

• Monthlyinvoicingandprogressupdate• Briefprogramreportonwaterlossprogramrecommendations• Slidedeckforpresentingwaterlossprogram

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4 PROJECTSCHEDULEANDCOST

ProjectSchedule

WSOunderstandsthattimeisoftheessenceforGWA,andwecanguaranteethattheprojectwillbecompletedintheexpectedtimeframewith

alldeliverablesbyJune30,2020assumingaprojectstartdatenolaterthanJanuary1,2020.

WSOwill update GWA staff regularlywith project findings and the status of each task underway.WSOwill conductmilestonemeetings to

presentanddiscussprojectfindingsandadjusttaskscheduleswherenecessary.WSOpridesitselfonbeingaccessibleandresponsive–wewill

beinclosecommunicationtoensuretheon-timeandcompletedeliveryoftheproject’sobjectives.

Additionally,WSOwillscheduleanin-personresultspresentationtodiscussfindingsandrecommendations.

Table1:ProposedProjectSchedule,OrganizedbyTask

PHASE3 January February March April May June

Task1:Reviewofexistingplansandmodels

Task2:IdentificationofpotentialDMAs

Task3:IdentificationofCustomersinDMAs

Task4:IdentificationofDMAInfrastructureRequirements

Task5:PrioritizationofProposedDMAs

Task6:DevelopDMAImplementationPlan

Task7:DevelopDraftScopesforImplementationProjectContractingElement

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ProjectCost

Phase3lumpsumcostis$250,000.

WSOwillsubmitmonthlyinvoicesbasedontaskpercentagecompletion.

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APPENDIXA–PROJECTORGANIZATIONALCHART

PHASE3:

Thisphaseof theprojectwillbe ledbyStevePreston.ReinhardSturmwillassist inaprojectadvisoryrole.Peter JinksofWSOwill serveas theprojectmanager for thisphaseof theproject.Peterwill bebasedinGuamforthedurationoftheproject.PeterwillbeassistedbyKrisWilliamsondataintakeandmanagement. KrisWilliamswillmostlywork remotely but it is planned for Kris or one ofWSOs LeakDetectionSpecialiststobeonsitetoassistPeterJinksduringtheDMApressuredatacollectiontask.

StevePrestonProjectDirector

PeterJinksProjectManager

KrisWilliamsNRWSpecialist

WSOLeakDetectionSpecialist/s

Reinhard SturmProjectAdvisor