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Newark Desalination Facility

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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  1. Newark Desalination Facility

  2. 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

  3. 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)

  4. IRP Recommended Strategy and Implementation Status

  5. Niles Cone Groundwater Basin and Aquifer Reclamation Program

  6. Niles Cone Groundwater Basin

  7. Brackish Groundwater Desalination Concept

  8. 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

  9. 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

  10. 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

  11. 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

  12. Projected Annual Operating Cost: $ 241/Ac-Ft

  13. 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

  14. End of Presentation

  15. 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).

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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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