mitigation techniques & treatment options for radionuclides · 37 royal melbourne, long grove,...
TRANSCRIPT
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Mitigation Techniques & Mitigation Techniques & Treatment Options for Treatment Options for
RadionuclidesRadionuclides
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OverviewOverviewAcronyms & AbbreviationsAcronyms & Abbreviations
Mitigation ChecklistMitigation Checklist
NonNon--Treatment OptionsTreatment Options
Treatment OptionsTreatment Options
Planning for Treatment InstallationPlanning for Treatment Installation
Implementing the PlanImplementing the Plan
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Acronyms & AbbreviationsAcronyms & Abbreviations
CalciumCa
MagnesiumMg
Empty Bed Contact TimeEBCT
Total Dissolved SolidsTDS
Best Available TechnologyBAT
Hydrous Manganese OxideHMOIronFe
Ion ExchangeIX
Electrodialysis/Electrodialysis ReversalED/EDR
Bed VolumesBV
Point of UsePOUReverse OsmosisRO
Activated AluminaAA
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Mitigation ChecklistMitigation Checklist
1.1. Monitor at entry pointsMonitor at entry points2.2. Determine compliance statusDetermine compliance status3.3. Consider nonConsider non--treatment optionstreatment options4.4. Raw water testingRaw water testing5.5. Determine treatment evaluation Determine treatment evaluation
criteria criteria 6.6. Select a mitigation strategySelect a mitigation strategy
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Mitigation Checklist, cont.Mitigation Checklist, cont.
7.7. Estimate capital and O & M costsEstimate capital and O & M costs8.8. Evaluate design considerationsEvaluate design considerations9.9. Pilot testPilot test10.10. Develop construction cost estimates & Develop construction cost estimates &
planplan11.11. Implement the strategyImplement the strategy12.12. Monitor at entry pointMonitor at entry point
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Consider NonConsider Non--Treatment OptionsTreatment OptionsAlternative Source(s)Alternative Source(s)
Install new sourceInstall new sourcePurchased water/interconnectionPurchased water/interconnection
Geological solutionsGeological solutions
Rehab existing wellsRehab existing wells
Drill new wellsDrill new wells
Blending or Seasonal UseBlending or Seasonal Use
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NonNon--Treatment Options: Treatment Options: BlendingBlending
High RadsSource
Low RadsSource
Common Header
< MCLBlend at
Entry Point
Meter Meter
Mixing device,Control valves
EP1
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NonNon--Treatment Options: Treatment Options: Seasonal UseSeasonal Use
High RadsSource
(seasonal)
Low RadsSource
(full-time)
Common Header
< MCL using low rads source only> MCL when blended, but RAA < MCL over any 4 consecutive quarters0
Meter Meter
EP1
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Raw Water TestingRaw Water TestingLook for interfering or competing ionsLook for interfering or competing ions
May plug media May plug media
May cause aesthetic problems (e.g., iron May cause aesthetic problems (e.g., iron and manganese)and manganese)
Other contaminants for simultaneous Other contaminants for simultaneous removal?removal?
NitrateNitrate
TDSTDS
IronIron
HardnessHardness
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Determine Treatment Evaluation Determine Treatment Evaluation CriteriaCriteria
Existing treatment processesExisting treatment processesFinished water targetsFinished water targetsLand availability and related costsLand availability and related costsWater lossWater lossCapacityCapacityResidual disposal optionsResidual disposal optionsOperator expertiseOperator expertiseAdditional requirementsAdditional requirements
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Mitigation ChecklistMitigation Checklist1.1. Monitor at entry pointsMonitor at entry points2.2. Determine compliance statusDetermine compliance status3.3. Consider nonConsider non--treatment optionstreatment options4.4. Measure water quality parametersMeasure water quality parameters5.5. Determine treatment evaluation criteriaDetermine treatment evaluation criteria6.6. Select a mitigation strategySelect a mitigation strategy
i.i. NonNon--treatment optionstreatment optionsii.ii. Existing treatmentExisting treatmentiii.iii. New treatmentNew treatment
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BATs and SSCTs: Radium OnlyBATs and SSCTs: Radium Only
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Radium Removal MethodsRadium Removal Methods
XElectrodialysis/Electrodialysis Reversal
XPerformed Hydrous Manganese Oxide (HMO) Filtration
XCo-Precipitation w/ Barium Sulfate XGreen Sand FiltrationXXXXX
SSCT (25-10,000)BATTechnology
XLime SofteningPOU RO
XReverse Osmosis (RO)Point of Use (POU) IX
XIon Exchange (IX)
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Green Sand Filtration Green Sand Filtration SSCT for radium removalSSCT for radium removal
Effectiveness varies (60 Effectiveness varies (60 –– 97%)97%)
Simple and operator friendly Simple and operator friendly
Potassium permanganate feed rate is keyPotassium permanganate feed rate is key
Disposal considerations (media & backwash)Disposal considerations (media & backwash)
Also removes iron, manganese, and arsenicAlso removes iron, manganese, and arsenic
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Green Sand Filtration
Raw Water
Filter
Raw WaterStatic Mixer
Backwash to Waste
Cone Aerator
Raw Water for Backwash
Filtered Water
Filter to
Waste
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CoCo--Precipitation w/ Barium SulfatePrecipitation w/ Barium Sulfate
SSCT for radium removalSSCT for radium removal
Effectiveness varies (40% Effectiveness varies (40% -- 90%)90%)
Complex processComplex processHigh level operator skill required High level operator skill required
Requires high sulfate levels in raw waterRequires high sulfate levels in raw water
Used mainly for waste effluent treatmentUsed mainly for waste effluent treatmentHas been used with AAHas been used with AA
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Sludge disposal and radon generation are issues of concern
CoCo--Precipitation w/ Barium Sulfate, Precipitation w/ Barium Sulfate, cont. cont.
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PrePre--Formed HMO FiltrationFormed HMO FiltrationSSCT for radium removalSSCT for radium removal
Can be up to 90% effectiveCan be up to 90% effective
Intermediate operator skillIntermediate operator skill
Can rely on existing treatment facilitiesCan rely on existing treatment facilities
May need to oxidize iron firstMay need to oxidize iron first
Limited effect if HMO underLimited effect if HMO under-- or overor over--doseddosed
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PrePre--Formed HMO Filtration, cont.Formed HMO Filtration, cont.
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ED/EDRED/EDRSSCT for radium removalSSCT for radium removal
Up to 95% effectiveUp to 95% effectiveAlso removes uranium, Also removes uranium, arsenic, nitrate, & morearsenic, nitrate, & more
Ions pass through IX Ions pass through IX membrane via DC voltagemembrane via DC voltage
EDR reverses DC powerEDR reverses DC power
Membrane buildMembrane build--up could up could complicate disposalcomplicate disposal
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BATs and SSCTs: Uranium OnlyBATs and SSCTs: Uranium Only
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Uranium Removal MethodsUranium Removal Methods
501 – 10,00025-10,000
X
X
XXCoagulation/FiltrationXActivated Alumina (AA)
X
XX
SSCTBATTechnology
XLime SofteningPOU RO
XRO
POU IXXIX
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Coagulation/FiltrationCoagulation/Filtration
BAT & SSCT for uraniumBAT & SSCT for uraniumGenerally 50 Generally 50 –– 90% effective90% effectiveAdvanced operator skill requiredAdvanced operator skill requiredCoagulant effectiveness is pHCoagulant effectiveness is pH--dependentdependentRemoval efficiency depends on prevailing Removal efficiency depends on prevailing charge on floc & uranium species presentcharge on floc & uranium species presentProbably not feasible as a new technologyProbably not feasible as a new technologyConsider backwash, sludge, and media Consider backwash, sludge, and media disposaldisposal
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Coagulation/Filtration, cont.Coagulation/Filtration, cont.
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Activated AluminaActivated AluminaSSCT for uranium removalSSCT for uranium removal
Up to 99% effectiveUp to 99% effective
Operates on demandOperates on demand
Relatively insensitive to TDS and sulfateRelatively insensitive to TDS and sulfate
Can be regeneratedCan be regenerated
Potential for disposable media optionPotential for disposable media option
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Activated Alumina, cont.Activated Alumina, cont.PrePre--treatment may be necessary treatment may be necessary
Oxidize iron, manganese, & arsenic Oxidize iron, manganese, & arsenic
Advanced operator skill required (pH adjustment)Advanced operator skill required (pH adjustment)
RegenerationRegenerationBoth acid and base required (impractical for small systems)Both acid and base required (impractical for small systems)Media tend to dissolve when regeneratedMedia tend to dissolve when regenerated
Disposal of backwash, regenerant, & media a concernDisposal of backwash, regenerant, & media a concern
Beware of arsenicBeware of arsenic
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Activated Alumina, cont.Activated Alumina, cont.
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BATs and SSCTs: BATs and SSCTs: Radium and Uranium Radium and Uranium
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Ion ExchangeIon Exchange
Anion exchange for uranium removalAnion exchange for uranium removalUp to 95% removalUp to 95% removalHigh uranium capacityHigh uranium capacityTreats 10,000 Treats 10,000 –– 100,000 BV100,000 BVCapacity may be sulfateCapacity may be sulfate--dependentdependent
Cation exchange for radium removalCation exchange for radium removalUp to 97% removalUp to 97% removal
Mixed bed IX for beta/photon removalMixed bed IX for beta/photon removal
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Ion Exchange, cont.Ion Exchange, cont.Operates on demandOperates on demand
Short contact time (flow insensitive)Short contact time (flow insensitive)(EBCT 1.5 (EBCT 1.5 -- 3 minutes)3 minutes)
Insensitive to pHInsensitive to pH
Can remove other contaminantsCan remove other contaminants
Resin can be regeneratedResin can be regenerated
Appropriate for small systems (POU also an option)Appropriate for small systems (POU also an option)
98+% water recovery98+% water recovery
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Ion Exchange, cont.Ion Exchange, cont.Excess oxidant may degrade resinExcess oxidant may degrade resin
>0.1 mg/L free chlorine >0.1 mg/L free chlorine
May require preMay require pre--filtration filtration
Sulfate can be a problemSulfate can be a problem
May require finished water pH adjustment May require finished water pH adjustment Removes bicarbonate alkalinityRemoves bicarbonate alkalinity22--5 columns in parallel may be appropriate5 columns in parallel may be appropriate
Generation of brineGeneration of brine
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Ion Exchange, cont.Ion Exchange, cont.
Example costs Example costs –– cation and anion units cation and anion units installedinstalled
< 1 GPM: $10,000 < 1 GPM: $10,000 -- $15,000$15,0001 1 –– 25 GPM: $20,000 25 GPM: $20,000 –– 30,00030,00040 40 –– 50 GPM: $35,000 50 GPM: $35,000 –– 53,00053,00080 GPM 80 GPM -- $65,000 $65,000 –– 98,00098,000
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POU IXPOU IXSSCT for radium, uranium, & SSCT for radium, uranium, & beta/photonbeta/photon
None are NSFNone are NSF--certified yetcertified yet
System or contractor owns, System or contractor owns, controls, and maintains unitscontrols, and maintains units
Moderate to high initial, O&M, Moderate to high initial, O&M, and operating costsand operating costs
Removes inorganic chemicals Removes inorganic chemicals & nitrate& nitrate
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Royal Melbourne, Long Grove, ILRoyal Melbourne, Long Grove, ILGoverning BodyGoverning Body
Royal Melbourne Homeowners AssociationRoyal Melbourne Homeowners AssociationCommunity Water SystemCommunity Water System
Gated golf course communityGated golf course communityGolf course and clubGolf course and club
•• Country club with banquet facilitiesCountry club with banquet facilities125 residential luxury homes125 residential luxury homes3 wells with average depth of 290m (950ft)3 wells with average depth of 290m (950ft)Radium levels in water out of complianceRadium levels in water out of compliance
Water QualityWater QualityCombined Radium 226/228 Combined Radium 226/228 –– 8.3pCi/L (avg.)8.3pCi/L (avg.)Gross Alpha Gross Alpha –– 11.4pCi/L (avg.)11.4pCi/L (avg.)Water Hardness Water Hardness –– 308 to 410 mg/L (18 to 24gpg)308 to 410 mg/L (18 to 24gpg)Iron Iron –– 0.21mg/L0.21mg/L
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Proposed Radium Mitigation Proposed Radium Mitigation Solutions for Royal Melbourne Solutions for Royal Melbourne
CWSCWSCentral treatment Central treatment
Ion exchangeIon exchangeReverse osmosisReverse osmosisBlending of shallow and deep wellsBlending of shallow and deep wells
New nonNew non--contaminated water sourcecontaminated water sourceShallow wells have iron and hydrogen sulfide Shallow wells have iron and hydrogen sulfide issues issues –– limited flow capabilitieslimited flow capabilitiesLake Michigan water not an optionLake Michigan water not an option
POE ion exchangePOE ion exchange
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Treatment Cost SummariesTreatment Cost Summaries
475,000475,00026,00026,000215,000215,000POE Ion ExchangePOE Ion Exchange
1,602,0001,602,00040,20040,2001,200,0001,200,000Central Reverse Central Reverse
OsmosisOsmosis
920,000920,00019,40019,400726,000726,000Central Ion ExchangeCentral Ion Exchange
Total 10 YearTotal 10 YearProgramProgram
CostCost($)($)
AnnualAnnualCostCost($)($)
Initial Initial Cost Cost ($)($)
RadionuclideRadionuclideTreatment Treatment
MethodMethod
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Royal Melbourne POE Program Royal Melbourne POE Program RequirementsRequirements
EquipmentEquipmentIdentical equipment for each installation siteIdentical equipment for each installation siteANSI/NSF approved softenerANSI/NSF approved softenerRegenerate with NaCl onlyRegenerate with NaCl onlyAlarm condition for equipment malfunctionAlarm condition for equipment malfunctionOwned by CWS or leased from service Owned by CWS or leased from service providerproviderMonitor condition of resin bed to trigger Monitor condition of resin bed to trigger regenerationregeneration
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POE Water Softener SolutionPOE Water Softener Solution
Sensor
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POE Program Requirements POE Program Requirements (Cont.)(Cont.)
ServiceServiceSalt delivery and equipment maintenanceSalt delivery and equipment maintenanceRegular monitoring of equipment Regular monitoring of equipment Assure brine tank filled with saltAssure brine tank filled with saltYearly maintenanceYearly maintenance10 year service agreement with renewal at 9 10 year service agreement with renewal at 9 yearsyears•• Assures compliance is maintainedAssures compliance is maintained
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Royal Melbourne POE Program Royal Melbourne POE Program Requirements (Cont.)Requirements (Cont.)
Monitoring EquipmentMonitoring EquipmentMonitor Monitor -- sense actual condition of resin bed to sense actual condition of resin bed to trigger regeneration trigger regeneration –– lower reserve requiredlower reserve required
•• Greater softener efficiencyGreater softener efficiency•• Automatic adjustment to changes in influent waterAutomatic adjustment to changes in influent water
Meter regeneration not as accurate Meter regeneration not as accurate –– higher higher reserve requiredreserve required
•• Variable hardness through yearVariable hardness through year•• Potential meter inaccuracies with low flowsPotential meter inaccuracies with low flows
Radionuclide MonitoringRadionuclide MonitoringMonthly monitoring of hardnessMonthly monitoring of hardnessDevelop hardness as indicatorDevelop hardness as indicator
•• Determine trigger and action levels through testingDetermine trigger and action levels through testing
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Radionuclide Trigger Level TestRadionuclide Trigger Level Test
0
1
2
3
4
5
6
7
8
0 50 100 150 200 250 300
Hardness Breakthrough (mg/L)
Con
cent
ratio
n (p
Ci/L
)
Gross Alpha
Combined Radium
Untreated Gross Alpha
Untreated Combined Radium
Influent Hardness 312 mg/L(18 Grains)
3 Grains 6 Grains 9 Grains 12 Grains 15 Grains
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ConclusionsConclusionsPOE water softening provides efficient POE water softening provides efficient economical solution to radium mitigation for the economical solution to radium mitigation for the ““right sizedright sized”” community water systemcommunity water systemCommunity association must have ability to Community association must have ability to implement and enforce POE compliance planimplement and enforce POE compliance planCompliance of POE solution attained with longCompliance of POE solution attained with long--term maintenance and monitoring planterm maintenance and monitoring plan
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Reverse OsmosisReverse OsmosisAt least 90% effective for radionuclide removalAt least 90% effective for radionuclide removal
Effectively removes other inorganicsEffectively removes other inorganics
Advanced operator skill requiredAdvanced operator skill required
Pretreatment often requiredPretreatment often required
Energy requirementsEnergy requirements
Water lossWater loss
PostPost--treatmenttreatment
Highly concentrated residualsHighly concentrated residuals
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RO Filtration ProcessRO Filtration Process
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POU ROPOU ROSSCT for all radionuclidesSSCT for all radionuclides
System or contractor owns, System or contractor owns, controls, and maintains unitscontrols, and maintains units
Moderate initial costs, high O&M Moderate initial costs, high O&M costscosts
Removes inorganic chemicals, Removes inorganic chemicals, microbials, metals, minerals, and microbials, metals, minerals, and some organic chemicalssome organic chemicals
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Lime SofteningLime SofteningBAT and SSCT for radium and uraniumBAT and SSCT for radium and uranium
Hydrated lime or quicklime additionHydrated lime or quicklime additionpH should be >10.5pH should be >10.5Magnesium hydroxideMagnesium hydroxide
Removes arsenic, Fe & Mg, and moreRemoves arsenic, Fe & Mg, and more
Advanced operator skill requiredAdvanced operator skill required
Direct discharge not permittedDirect discharge not permitted
Excessive softening can corrode pipesExcessive softening can corrode pipes
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Enhanced Lime SofteningEnhanced Lime Softening
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Treatment Considerations: Treatment Considerations: Estimating CostsEstimating Costs
Raw and treated water qualityRaw and treated water qualityPiloting, permitting, and trainingPiloting, permitting, and trainingEngineering, design, and constructionEngineering, design, and constructionLicensing Licensing –– NRC (?)NRC (?)Chemicals and chemical storageChemicals and chemical storageMedia replacementMedia replacementEnergyEnergyLaborLaborCompliance monitoringCompliance monitoringRecordkeepingRecordkeepingResidual handling and disposalResidual handling and disposal
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Treatment Considerations: Treatment Considerations: General DesignGeneral Design
ConfigurationConfigurationParallelParallelSeriesSeriesGuard columnsGuard columns
Split stream treatmentSplit stream treatment
RedundancyRedundancy
Process control Process control monitoringmonitoring
Pre & postPre & post--treatmenttreatment
ResidualsResiduals
Loading ratesLoading rates
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Treatment Considerations: TestingTreatment Considerations: Testing
Bench scale testingBench scale testing
Pilot testingPilot testing
Use reputable vendorsUse reputable vendors•• Low bidder approachLow bidder approach•• Seek warranties/leasesSeek warranties/leases•• Ask appropriate questionsAsk appropriate questions
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Pilot Testing: Pros & ConsPilot Testing: Pros & Cons
Answers questions:Answers questions:EffectivenessEffectivenessNet water productionNet water productionFinished water qualityFinished water qualityResidualsResidualsImpact of variablesImpact of variablesCostsCosts
Develop siteDevelop site--specific design criteriaspecific design criteriaCan be costly & time consumingCan be costly & time consuming
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Establish a ProtocolEstablish a Protocol
IntroductionIntroductionObjectivesObjectivesMedia DescriptionMedia DescriptionProcess DescriptionProcess DescriptionProject ScheduleProject ScheduleData CollectionData Collection
ParametersParametersLocationsLocationsScheduleSchedule
Quality Assurance Quality Assurance ProgramProgramResiduals Residuals Management & Management & DisposalDisposalPilot Study SummaryPilot Study Summary
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Mitigation ChecklistMitigation Checklist1.1. Monitor at entry pointsMonitor at entry points2.2. Determine compliance statusDetermine compliance status3.3. Consider nonConsider non--treatment optionstreatment options4.4. Raw water testingRaw water testing5.5. Determine treatment evaluation criteria Determine treatment evaluation criteria 6.6. Select a mitigation strategySelect a mitigation strategy7.7. Estimate capital and O & M costsEstimate capital and O & M costs8.8. Evaluate design considerationsEvaluate design considerations9.9. Pilot testPilot test10.10. Develop construction cost estimates and planDevelop construction cost estimates and plan11.11. Implement the strategyImplement the strategy12.12. Monitor at entry pointMonitor at entry point
Compliance!
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Questions?Questions?