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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

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Brackish Water Extraction & Treatment ProjectConceptual (diagrammatic – not to scale)

Brackish Water Extraction Well Field

PVPTP

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

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Dark Blue – salineLt Blue – brackishGray – slightly brackish to background

Lower part of UAS (~ Mugu aquifer)

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The “Rule”: Raw Water Quality and Finished Water Goals Determine the Process

Raw Water

Quality

Finished Water Goals

Reverse Osmosis

Treatment Process

Electrodialysis Reversal

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Raw Water Quality Data For Three Existing Wells Are Representative Of The Proposed Desalter Well Field Quality.

Raw Water Quality

Parameter *Composite Raw Water

Composite Worst Case Raw Water

Chloride (mg/L Cl-) 3,228 4,843Sodium (mg/L Na+) 1,077 1,615Sulfate (mg/L SO4

2-) 812 1,218Bicarbonate (mg/L

HCO3-)

246 369

Boron (mg/L B) 0.415 0.622TDS (mg/L) 6,426 9,639

pH 7.14 7.14

* Composite raw water comprised of Wells SW-195, CM7-190, and CM4-275; (Data from Nov. 2009 -Dec. 2013)

150% of Raw

Water

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Product Water Quality Goals Are Consistent With Local Agricultural Requirements.

Ideal Product Water Based on Agricultural Requirements

Parameter Units Criteria

Chloride mg/L < 50Sodium mg/L < 50Sulfate mg/L < 150

Bicarbonate mg/L < 150Boron mg/L < 0.8TDS mg/L < 600pH mg/L > 6.5 and < 7.0

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Desalting Technologies Be Categorized Into Three Types Of Processes

Reverse Osmosis (RO)Nanofiltration (NF)

Physical Membrane Process

Electrodialysis Reversal (EDR)

Electrically Driven Membrane Process

Distillation

Thermal Process

Not Practical for Brackish Groundwater

Not Competitive with RO Above 4,000 mg/L TDS

RO is proposed as the most appropriate treatment process for the South Oxnard Plain desalter facility.

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The RO Treatment Process Can Be Grouped Into Three Major Elements.

RO Pre-treatment RO Post-treatmentRO System

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Site Layout For 20,000 AFY

Facility

Sand Separators, Cartridge Filters, and RO Trains for

20,000 AFYFacility

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AWPF

Proposed Desalterand Well

Locations

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Proposed Desalterand Well Locations

AWPF

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Ocean

Sea Water

Fresh Water

Sea Level

PiezometricSurface

Ocean

Sea WaterFresh Water

Groundwater Pumping

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Ocean

Fresh Water

Groundwater Pumping Reduced

Brackish Groundwater Pumping

BWTP

Treated

Water

Sea Water

OceanSea

WaterFresh Water

Groundwater Pumping

Brackish Groundwater

Pumping

Sea Water

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AWPF

Conceptual Groundwater Flow

Paths

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Unit Water Cost Consistent With Other Projects With Similar Conditions

Desalter Plant Design Capacity, AFY 10,000 20,000

Capital Costs, $ $85,137,000 $147,966,000

Operating Costs, $ /AF $653-$821 $601-$733

Annual O&M with Capital Recovery, $/AF $1,111-$1,278 $998-$1,130

Add ~$100/AF for potable water quality

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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 water supplies? Yes

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ProsWater Supply

o Reliable new water source

o Sustainable sourceWater Quality

o Aquifer rehabilitationo Extraction barriero AG or potable WQ

GW Managemento In lieu rechargeo Direct recharge

Flexible operations

ConsMay induce sea

water towards well field (long term)Future blending may

be required (keep TDS in specific range)May impact WL &

WQ for some UAS wells near well field

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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 CEQA

Solar ?

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PTP-PV Interconnections PTP-CAMROSA

Conejo CkInterconnection

PTP-BWTP Interconnection

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PTP-BWTP-AWPF Interconnection

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Aquifer Recharge – periods of low irrigation demand PTP-PV Delivery

PTP-PV Pump Station

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“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 ?