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Discussion Topics • Background – Why consider this project? • Water Quality – Spatial and temporal variability • Process Selection and Design • Cost • Resource Utilization Efficiency • Conclusions CarolloPaperTemplateWithLogo.pptx/ 2
Brackish Water Extraction & Treatment Project Conceptual (diagrammatic – not to scale) Extraction well field is source of water & barrier to further SWI Disposal of brine in SMP Brackish GW treatment for agric use is simpler than for potable use Flexible operation PTP PV Brackish Water Extraction CarolloPaperTemplateWithLogo.pptx/ Well Field
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Lower part of UAS (~ Mugu aquifer) Dark Blue – saline Lt Blue – brackish CarolloPaperTemplateWithLogo.pptx/ Gray – slightly brackish to background 5
The “Rule”: Raw Water Quality and Finished Water Goals Determine the Process Raw Finished Water Water Reverse Osmosis Quality Goals Electrodialysis CarolloPaperTemplateWithLogo.pptx/ Reversal Treatment Process 6
Raw Water Quality Data For Three Existing Wells Are Representative Of The Proposed Desalter Well Field Quality. 150% of Raw Water Raw Water Quality * Composite Composite Worst Parameter Raw Water Case Raw Water Chloride (mg/L Cl - ) 3,228 4,843 Sodium (mg/L Na + ) 1,077 1,615 Sulfate (mg/L SO 4 812 1,218 2- ) Bicarbonate (mg/L 246 369 HCO 3 - ) Boron (mg/L B) 0.415 0.622 TDS (mg/L) 6,426 9,639 CarolloPaperTemplateWithLogo.pptx/ pH 7.14 7.14 * Composite raw water comprised of Wells SW-195, CM7-190, and CM4-275; (Data from Nov. 2009 - Dec. 2013) 7
Product Water Quality Goals Are Consistent With Local Agricultural Requirements. Ideal Product Water Based on Agricultural Requirements Parameter Units Criteria Chloride mg/L < 50 Sodium mg/L < 50 Sulfate mg/L < 150 Bicarbonate mg/L < 150 Boron mg/L < 0.8 CarolloPaperTemplateWithLogo.pptx/ TDS mg/L < 600 pH mg/L > 6.5 and < 7.0 8
Desalting Technologies Be Categorized Into Three Types Of Processes Not Practical Not Competitive for Brackish with RO Above Groundwater 4,000 mg/L TDS Distillation Reverse Osmosis (RO) Electrodialysis Nanofiltration (NF) Reversal (EDR) Thermal Physical Membrane Electrically Driven Process CarolloPaperTemplateWithLogo.pptx/ Process Membrane Process RO is proposed as the most appropriate treatment process for the South Oxnard Plain desalter facility. 9
The RO Treatment Process Can Be Grouped Into Three Major Elements. CarolloPaperTemplateWithLogo.pptx/ RO Pre-treatment RO RO Post-treatment System 10
Site Layout For 20,000 AFY Facility Sand Separators, Cartridge Filters, and RO Trains for CarolloPaperTemplateWithLogo.pptx/ 20,000 AFY Facility 11
Proposed Desalter and Well Locations AWPF CarolloPaperTemplateWithLogo.pptx/ 12
Proposed Desalter and Well Locations AWPF CarolloPaperTemplateWithLogo.pptx/ 13
Piezometric Surface Sea Level Ocean Fresh Water Sea Water Groundwater Pumping CarolloPaperTemplateWithLogo.pptx/ Ocean Sea Water Fresh Water
Groundwater Brackish Pumping Groundwater Pumping Ocean Sea Sea Water Water Fresh Water Groundwater Brackish Groundwater Treated Pumping Pumping Reduced BWTP Water CarolloPaperTemplateWithLogo.pptx/ Ocean Sea Water Fresh Water
Conceptual Groundwater Flow Paths AWPF CarolloPaperTemplateWithLogo.pptx/ 16
Unit Water Cost Consistent With Other Projects With Similar Conditions Desalter Plant Design 10,000 20,000 Capacity, AFY Capital Costs, $ $85,137,000 $147,966,000 $653-$821 $601-$733 Operating Costs, $ /AF CarolloPaperTemplateWithLogo.pptx/ Annual O&M with Capital $1,111-$1,278 $998-$1,130 Recovery, $/AF Add ~$100/AF for potable water quality 17
Brackish Groundwater Plant on the South Oxnard Plain is Technically Feasible Is there raw water available? Yes Is a desalter technically feasible? Yes Is there a viable waste brine disposal option? Yes Are there customers for the treated water? Yes Is the treated water cost a viable option for long-term CarolloPaperTemplateWithLogo.pptx/ water supplies? Yes 18
Pros Cons Water Supply May induce sea o Reliable new water water towards well source field (long term) o Sustainable source Future blending may Water Quality be required (keep o Aquifer rehabilitation TDS in specific o Extraction barrier range) o AG or potable WQ May impact WL & GW Management WQ for some UAS o In lieu recharge wells near well field o Direct recharge CarolloPaperTemplateWithLogo.pptx/ Flexible operations 19
Next Steps? Additional water quality analyses in potential area of wellfield (complete) Grant research (in progress) Stakeholder outreach (in progress) AG or Potable water quality Real estate for treatment plant and wellfield Exploratory test holes with water quality sampling and analyses SCE Load Study CarolloPaperTemplateWithLogo.pptx/ Solar ? CEQA 20
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PTP-PV PTP-CAMROSA Interconnections Conejo Ck Interconnection PTP-BWTP Interconnection CarolloPaperTemplateWithLogo.pptx/ 23
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PTP-BWTP-AWPF Interconnection CarolloPaperTemplateWithLogo.pptx/ 25
Aquifer Recharge – periods of PTP-PV Delivery low irrigation demand PTP-PV Pump Station CarolloPaperTemplateWithLogo.pptx/ 26
“Everything we know is only some kind of approximation, because we know that we do not know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to be corrected." [Richard Feynman, Nobel Prize Winning Physicist] Questions ? CarolloPaperTemplateWithLogo.pptx/
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