california conference of public health officials july 23, 2009 monterey regional water pollution...
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California Conference of Public Health OfficialsCalifornia Conference of Public Health Officials
July 23, 2009July 23, 2009
Monterey Regional Water Pollution Control AgencyMonterey Regional Water Pollution Control Agency
Recycled Water for Agriculture:A Case History in
Securing Grower Confidence
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Seawater Intrusion FrontSeawater Intrusion Front180-Foot Aquifer180-Foot Aquifer
Groundwater exceeding 500 mg/L Chloride limit
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Seawater Intrusion FrontSeawater Intrusion Front400-Foot Aquifer400-Foot Aquifer
Groundwater exceeding 500 mg/L Chloride limit
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Independent analysisScientifically soundExpert reviewUse opposition
TransparencyCollaborationMonthly meetingsEducation
Competitive/ cost effectiveAdded value productHigh quality
Voluntary useOn-going extra monitoringSpecial studiesCrisis management support
GAINING GROWER ACCEPTANCEGAINING GROWER ACCEPTANCE
DATADATA
COMMUNICATIONCOMMUNICATION
VALUEVALUE
CUSTOMER SERVICECUSTOMER SERVICE
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DATADATAMonterey Wastewater Reclamation Study for Agriculture (MWRSA )Monterey Wastewater Reclamation Study for Agriculture (MWRSA )
• 11 year study: 1976 to 198711 year study: 1976 to 1987
• 5 years of field testing5 years of field testing
• Independent monitoring:Independent monitoring: UC Davis and UC BerkeleyUC Davis and UC Berkeley
• Team included state, Team included state, local health officials, and ag local health officials, and ag
stakeholdersstakeholders
• Pathogen, soil, plant Pathogen, soil, plant tissue analysistissue analysis
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FIELD RESEARCH RESULTSFIELD RESEARCH RESULTS
Conclusion: Conclusion: Food Crops Safe To Be Eaten UncookedFood Crops Safe To Be Eaten Uncooked
No viruses detectedNo viruses detected
99.999% removal of seeded virus99.999% removal of seeded virus
No negative field worker health effectsNo negative field worker health effects
Heavy metals not detectedHeavy metals not detected
Crop yields increasedCrop yields increased
Crop quality unaffectedCrop quality unaffected
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Secondary TreatmentOcean outfall 2 miles250,000 population
Regional TreatmentPlant (RTP)
1989
New water supply for 19,450 AFY
2-PHASE IMPLEMENTATION
3° TREATMENTSalinas Valley Reclamation
Project (SVRP)
Monterey County Water Recycling Projects
1997
DISTRIBUTIONCastroville Seawater
Intrusion Project (CSIP)
Title 22 – Cl2 Disinfection
Unrestricted use12,080 Acres
45 miles pipeline
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MRWPCA Service AreaJPA with 12 members
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Food Safety Study, 1997-1998Food Safety Study, 1997-1998
Efficacy of Pathogen RemovalEfficacy of Pathogen RemovalStudy 1997-2003Study 1997-2003
• SalmonellaSalmonella• CyclosporaCyclospora• E. ColiE. Coli 0157:H7 0157:H7• LegionellaLegionella• GiardiaGiardia• CryptosporidiumCryptosporidium• Fecal Coli, Turbidity, Cl ResidualFecal Coli, Turbidity, Cl Residual
Results:
No viable microbes of public health concern in recycled water
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COMMUNICATIONCOMMUNICATIONMaximizing Perceived SafetyMaximizing Perceived Safety
● Transparency Transparency ● Web data access● Grower webpage – daily updates
● CollaborationCollaboration● Community leaders, ag industry,
regulators & staff● Monthly meetings
● Education & outreachEducation & outreach● Tours● School programs● Civic and professional group talks● Exhibits● Newsletters
Build and maintain trust
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Collaboration ResultsCollaboration Results Reasonable site labeling
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CUSTOMER SERVICE• Voluntary UseVoluntary Use• Additional StudiesAdditional Studies
• 3° Filter flow rate increase 50%• Soil salt monitoring 8+ years• Endocrine disrupting compounds
• On-going Data CollectionOn-going Data Collection• Agronomic• Food safety
• Crisis Management SupportCrisis Management Support
95% use project water
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September 2006
Spinach E. coli Incident
CNN arrives:
What’s the story?
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VALUEVALUE
Quality assured water at reasonable cost
Monitoring includedMonitoring included
Nutrients (N, K, P)Nutrients (N, K, P)
Competitive costCompetitive cost
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Title 22 Water Title 22 Water RecyclingRecycling
For “For “Unrestricted Use”Unrestricted Use”
1. Primary1. Primary – gravity – gravity• 70-75% solids removed70-75% solids removed
2. Secondary2. Secondary – biological – biological• 95% solids removed95% solids removed
3. Tertiary3. Tertiary – chemical filtration – chemical filtration• Alum polymer flocculationAlum polymer flocculation• Filtration – anthracite, sand, gravelFiltration – anthracite, sand, gravel• Disinfection - 2 hrs, ClDisinfection - 2 hrs, Cl22
• < 98% solids removed< 98% solids removed
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2000 California Water Recycling Criteria- Agricultural Uses -
Type of UseTotal Coliform Requirements
Treatment Required
Irrigation of fodder, fiber & seed crops, processed food crops, pasture for non-milking animals, orchards & vineyards (no contact with edible portion of crop)
None specified • Secondary
Irrigation of pasture for milking animals
23/100 mL• Secondary• Disinfection
Irrigation of food crops (no contact with edible portion of crop)
2.2/100 mL• Secondary• Disinfection
Irrigation of any food crop where reclaimed water comes in contact with the edible portion of the crop, including root crops
2.2/100 mL• Secondary• Filtration• Disinfection
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● Daily avg flow < 29.6 MGDDaily avg flow < 29.6 MGD
● Constituent limits:Constituent limits:
- - BOD5 (mg/L)BOD5 (mg/L) 10 10 25 25 2.4 2.4
- Turbidity (NTU)- Turbidity (NTU) 2 2 5 5 1.5 1.5
- Suspended Solids (mg/L) - Suspended Solids (mg/L) 10 10 25 25 3.5 3.5
- Settleable Solids (mL/L/hr) -- - Settleable Solids (mL/L/hr) -- 0.1 0.1 < 0.1 < 0.1
- Total Dissolved Solids (mg/L) -- 1,500- Total Dissolved Solids (mg/L) -- 1,500 859 859
- Total Coliform (MPN/100mL) 2.2 - Total Coliform (MPN/100mL) 2.2 23 23 100%100% ComplianceCompliance
(Weekly Median)(Weekly Median) (in no more than (in no more than 1 sample/month)1 sample/month)
RWQCB – MRWPCA Permit RequirementsRWQCB – MRWPCA Permit Requirements Recycled Water Recycled Water
ConstituentConstituent MeanMean MaxMax 2008 avg2008 avg
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MONITORING PROGRAM 2008 MONITORING PROGRAM 2008 Red – Regulatory Requirement Red – Regulatory Requirement Yellow – Irrigation Suitability Yellow – Irrigation Suitability White – Food SafetyWhite – Food Safety
Tertiary Plant DISTRIBUTION SYSTEM
CONSTITUENTSRecycled
WaterStorage Pond
Supplemental Wells (21)
Monitoring Stations (9)
Turnouts(112)
Metals & Organics YearlyYearly ---- ---- ---- ----
Agronomic & Salinity Bi-WeeklyBi-Weekly ---- YearlyYearly ---- ----
TDS Bi-WeeklyBi-Weekly ---- YearlyYearly
Specific Conductance DailyDaily DailyDaily YearlyYearly Continuous Continuous 5/wk5/wk
pH DailyDaily DailyDaily YearlyYearly WeeklyWeekly 5/wk5/wk
Total Suspended Solids DailyDaily ---- ---- ---- ----
Turbidity ContinuousContinuous DailyDaily ---- WeeklyWeekly ----
Settleable Solids DailyDaily WeeklyWeekly ---- ---- ----
Total Organic Carbon WeeklyWeekly ---- ---- ---- ----
BOD WeeklyWeekly ---- ---- ---- ----
Chlorine Residual ContinuousContinuous ContinuousContinuous ---- ContinuousContinuous 5/wk5/wk
Total Coliform DailyDaily DailyDaily MonthlyMonthly DailyDaily 2/wk2/wk
Fecal Coliform DailyDaily DailyDaily ---- DailyDaily 2/wk2/wk
Generic E. coli DailyDaily DailyDaily MonthlyMonthly DailyDaily 2/wk2/wk
Total and Fecal Coliform(County Health) ---- Bi-WeeklyBi-Weekly
Parasites & viruses ---- 4/Yr4/Yr ---- ---- ----
Clostridium P. (Co Health) Bi-WeeklyBi-Weekly ---- ---- ----
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2008 2008 RECYCLED WATER QUALITYRECYCLED WATER QUALITY
Agronomic Water Quality* Agronomic Water Quality*
TDSTDS 863 mg/L863 mg/LSARSAR 4.8 4.8 pHpH 7.1 7.1 ChlorideChloride 257 mg/L257 mg/LSodiumSodium 171 mg/L171 mg/LTotal NitrogenTotal Nitrogen 38 mg/L 38 mg/L
* Grab samples
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CONCEPT TO SALAD BOWLCONCEPT TO SALAD BOWL
DATADATA
COMMUNICATIONCOMMUNICATION
VALUEVALUE
CUSTOMER SERVICECUSTOMER SERVICE
Prove its safe
Get them to believe and trust.
How can they say NO?
Keep them happy
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““Changing Wastewater To Safe Water”Changing Wastewater To Safe Water”
Karen HarrisCommunity Relations Specialist
(831) [email protected]