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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 [email protected].
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