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Fresh Water Supply Alternatives and Technologies Community Advisory Committee Meeting September 28, 2011 Hinkley, Calif

Fresh Water Supply Alternatives and Technologies Community Advisory Committee Meeting September 28, 2011 Hinkley, California. Malcolm Pirnie’s Water Division is a subsidiary of ARCADIS, a global science and engineering consulting firm working in more than 100 countries

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Fresh Water Supply Alternatives and Technologies Community Advisory Committee Meeting September 28, 2011 Hinkley, Calif

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  1. Fresh Water SupplyAlternatives and Technologies Community Advisory Committee MeetingSeptember 28, 2011Hinkley, California

  2. Malcolm Pirnie’s Water Division is a subsidiary of ARCADIS, a global science and engineering consulting firm working in more than 100 countries • Over 100 years experience designing, building and managing water treatment and water supply systems • Broad experience at all scales of water supply applications, from rural systems to municipal and regional networks ARCADIS & Malcolm Pirnie

  3. Basic Fresh Water Supply Alternatives Tie into Golden State Water Company Central water treatment and distribution Whole house water treatment Add option of deeper wells Trucking water

  4. Option 1Tie into Golden State Water Company (GSWC) • GSWC supplies potable water to Barstow • Water is treated and meets current drinking water standards • Build a 12-mile pipeline to carry water from Barstow to Hinkley • Store and distribute water using a network of pipelines, tanks and pumps

  5. Option 1Tie into Golden State Water Company ADVANTAGES • Source is public water system with known water quality • Water is treated and monitored for drinking water standards DISADVANTAGES • Substantial time and cost required to construct transmission line and network of distribution pipelines • Additional water quality monitoring may be required • Long transit may cause water quality deterioration • Loss of independent water supply

  6. Option 2Central Treatment and Distribution • Would require drilling new supply wells • Water will be treated and disinfected at a central treatment facility • Treated water will be delivered to homes through a network of pipelines, tanks and pumps

  7. Option 2Central Treatment and Distribution ADVANTAGES • Water is treated and monitored for drinking water standards • Treatment can be tailored to the water quality of the new wells • New infrastructure for the area • New infrastructure for the community DISADVANTAGES • Challenge to locate and develop reliable, long-term supply wells • Substantial time and cost required to construct transmission line and network of distribution pipelines • State law requires system to be managed as a formal water utility

  8. Option 3Whole House Water Treatment • Treat and disinfect water entering the homes • Treatment would include ion exchange media or reverse osmosis (RO) filters that are placed outside the homes and connect to the existing supply lines • Equipment provider would conduct the necessary monitoring and maintenance

  9. Option 3Whole House Water Treatment ADVANTAGES • Relatively less implementation time and cost • Equipment Federal/State certified • Water equipment vendor maintains the equipment • Local control DISADVANTAGES • Water quality varies well to well • May require multiple treatment stages (pre-filter, core treatment, post-filter) • Some systems can generate waste streams that may need to be disposed to the septic tanks • Must be installed on the property • Requires performance testing

  10. Option 3Whole House Water Treatment • Next steps to pilot test equipment: • Evaluate range of options for whole house water treatment • Select candidate systems for pilot testing • Pilot testing to begin in November 2011

  11. Option 4Deeper wells ADVANTAGES • Familiar approach • Maintain existing plumbing • May produce better quality? DISADVANTAGES • Construction impacts • Groundwater is in an “over draft” condition in many parts of the Mojave Basin • Experts unsure about yield on west side • May not produce better quality?

  12. Option 5Trucking of Water ADVANTAGES • Easy to start-up • Obtain high quality water DISADVANTAGES • Uses lots of gas • Traffic impacts • Regular deliveries • Must insure quality is maintained during delivery • Tanks needed at houses or more frequent deliveries

  13. Next Steps in Evaluation Process • Gather stakeholder views • Continue evaluation of options • Coordinate with Regional Water Quality Control Board • Coordinate with California Department of Public Health • Conduct pilot testing of treatment devices • Refine construction and time estimates

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