Newark desalination facility
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Newark Desalination Facility. San Francisco. Walnut Creek. Oakland. San Francisco Bay. Fremont. Location Map. San Jose. ACWD Service Area. HWY 92. C. Well Fields. Union City. HAYWARD FAULT. CREEK. DRY. Hetch-Hetchy (SFPUC). South Bay Aqueduct (DWR). ALAMEDA.

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Newark Desalination Facility

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Newark desalination facility

Newark Desalination Facility


Acwd service area

San

Francisco

Walnut

Creek

Oakland

San Francisco Bay

Fremont

Location Map

San Jose

ACWD Service Area

HWY 92

C

Well Fields

Union City

HAYWARD FAULT

CREEK

DRY

Hetch-Hetchy (SFPUC)

South Bay Aqueduct (DWR)

ALAMEDA

San Francisco Bay

CREEK

COYOTE

I-680

HILLS

Fremont

Water Treatment Plants

I-880

HWY 84

Newark

0

0.5

1

miles


Acwd water supply planning

ACWD Water Supply Planning

  • ACWD Integrated Resources Planning Study (1995) identified key issues for ACWD:

    • Dry year water supply reliability

    • System production capacity

    • Water quality (hardness)


Irp recommended strategy and implementation status

IRP Recommended Strategy and Implementation Status


Newark desalination facility

Niles Cone Groundwater Basin and Aquifer Reclamation Program


Niles cone groundwater basin

Niles Cone Groundwater Basin


Newark desalination facility

Brackish Groundwater Desalination Concept


Brackish groundwater desalination benefits

Brackish Groundwater Desalination Benefits

  • Water Supply

    • New source of supply

    • Firm source of supply

  • Water Production

    • Provides new source of production to distribution system

  • Water Quality

    • High quality water

    • Helps meet district’s hardness goals

  • Reliability of Local Control

    • Provides water source west of Hayward Fault

    • Does not rely on outside sources


1998 pilot tests performed

1998 - Pilot Tests Performed

Findings

  • ARP water has low membrane fouling potential & requires minimal pretreatment

  • Low pressure membranesperformed well and will meet WQ Objectives

  • RO Concentrate met NPDES discharge requirements


2001 designs finalized

2001 – Designs Finalized

ACWD Service Area

HWY 92

C

Union City

HAYWARD FAULT

CREEK

DRY

San Francisco Bay

DARVON WELLFIELD

ALAMEDA

CEDAR WELLFIELD

CREEK

COYOTE

I-680

Fremont

HILLS

Desal Facility $12.2 M

I-880

HWY 84

Well Upgrades $ 1.3 M

DESALINATION FACILITY

Newark

Supply and

Discharge Pipelines $ 6.7 M

Total : $20.2 M

0

0.5

1

miles


Concentrate discharge

Concentrate Discharge

  • Final Discharge Location

    • Flood control channel

      discharges to San Francisco Bay (approximately 2500 ft from Desal, 20,000 ft from San Francisco Bay)

    • Discharge Monitoring is conducted regularly to ensure that the concentrate stream is not negatively impacting the environment


Projected annual operating cost 241 ac ft

Projected Annual Operating Cost: $ 241/Ac-Ft


Summary what have we learned

Summary – What Have We Learned?

  • Desalination provides ACWD cost-effective local supply

    • Improved water quality

    • Public acceptance – favorably received

    • Cost comparable with other supplies

  • Most challenging aspects included:

    • Discharge permit

    • Construction in an urbanized area

  • Future challenges include:

    • Regulatory changes regarding discharge

    • Future energy costs uncertain


End of presentation

End of Presentation


Npdes permit requirements for desal

NPDES Permit Requirements for Desal

  • Conduct Self-Monitoring Program:

    • On a monthly basis:

      • Perform Acute Toxicity Testing on Concentrate– static renewal bioassay using 2 test species: three-spine stickleback and either rainbow trout or fathead minnow.

      • Sample Concentrate for -

        Total Dissolved Solids, Dissolved Oxygen, Chlorides, Conductivity, pH, Temperature, Salinity and Total Metals (i.e., Arsenic, Cadmium, Chromium, Copper, Lead, Magnesium, Mercury, Nickel, Selenium, Silver and Zinc).


Flood control channel discharge issues

Flood Control Channel Discharge Issues

  • Concentrate Water Quality

    • Salinity

    • Trace Metal Concentrations

  • Habitat Impacts

    • Sensitive Species

    • Vegetation

  • Permit Acquisition

    • Regional Water Quality Control Board NPDES Permit to Discharge

    • Calif Dept of Fish & Game Streambed Alteration Permit to Construct Outfall


Permit acquisition approach

Permit Acquisition Approach

  • Identify Major Stakeholders and their concerns

    • California Regional Water Control Board (RWQCB)

    • United States Fish and Wildlife Services (USFWS)

    • California Department of Fish and Game (CDF)

  • Conduct feasibility & technical studies (i.e., pilot work & water quality analysis)

  • Conduct vegetative biotic surveys to confirm habitat species


Projected concentrate discharge water quality

Projected Concentrate Discharge Water Quality

1 Non Detect (Chromium VI is not naturally occurring and typically present when

total chromium values are elevated. Projected total chromium = 14.9 -24.6 ug/l)

2 Calculated values assuming a hardness = 400 mg/l


Water quality objectives

Water Quality Objectives

  • RO Permeate (Potable) Water Quality

    • TDS <100 mg/l

    • Hardness < 10 mg/l

  • Finished Water Quality

    • Hardness <150 mg/l

    • Non-corrosive

    • Good Tasting Water

  • Concentrate Water Quality

    • pH 6-9

    • Non-toxic

    • Meet NPDES Permit Requirements


Future related projects

Future Related Projects

  • Wellfield Treatment Facility

    • Purpose: Demineralize well water and reblend w/ well and SFPUC Water

    • Impact: Lower hardness, improve protection and operating flexibility

    • Date: 2006

  • Newark Desal Facility Expansion

    • Purpose: Additional production; blended with well water

    • Impact: Lower, more uniform hardness, increase reliability

    • Date: 2009


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