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Fresh Water SupplyFresh Water SupplyAlternatives and Technologies Alternatives and Technologies

Community Advisory Committee Meeting

September 28, 2011Hinkley, California

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ARCADIS & Malcolm

Pirnie

• 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

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1) Tie into Golden State Water Company

2) Central water treatment and distribution

3) Whole house water treatment

4) Add option of deeper wells

5) Trucking water

BasicFresh Water

Supply Alternatives

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• 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

Option 1Tie into Golden State Water Company

(GSWC)

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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

DISADVANTAGESDISADVANTAGES

• Substantial time and cost Substantial time and cost required to construct transmission required to construct transmission line and network of distribution line and network of distribution pipelinespipelines

• Additional water quality Additional water quality monitoring may be requiredmonitoring may be required

• Long transit may cause water Long transit may cause water quality deteriorationquality deterioration

• Loss of independent water supplyLoss of independent water supply

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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

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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

DISADVANTAGESDISADVANTAGES

• Challenge to locate and develop Challenge to locate and develop reliable, long-term supply wells reliable, long-term supply wells

• Substantial time and cost Substantial time and cost required to construct transmission required to construct transmission line and network of distribution line and network of distribution pipelinespipelines

• State law requires system to be State law requires system to be managed as a formal water utilitymanaged as a formal water utility

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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

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Option 3Whole House Water Treatment

ADVANTAGES

• Relatively less implementation time and cost

• Equipment Federal/State certified

• Water equipment vendor maintains the equipment

• Local control

DISADVANTAGESDISADVANTAGES

• Water quality varies well to well Water quality varies well to well

• May require multiple treatment May require multiple treatment stages (pre-filter, core treatment, stages (pre-filter, core treatment, post-filter)post-filter)

• Some systems can generate Some systems can generate waste streams that may need to waste streams that may need to be disposed to the septic tanksbe disposed to the septic tanks

• Must be installed on the propertyMust be installed on the property

• Requires performance testingRequires performance testing

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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

Option 3Whole House Water Treatment

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Option 4Deeper wells

ADVANTAGES

• Familiar approach

• Maintain existing plumbing

• May produce better quality?

DISADVANTAGESDISADVANTAGES

• Construction impactsConstruction impacts

• Groundwater is in an “over draft” Groundwater is in an “over draft” condition in many parts of the condition in many parts of the Mojave BasinMojave Basin

• Experts unsure about yield on Experts unsure about yield on west sidewest side

• May not produce better quality?May not produce better quality?

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Option 5Trucking of Water

ADVANTAGES

• Easy to start-up

• Obtain high quality water

DISADVANTAGESDISADVANTAGES

• Uses lots of gasUses lots of gas

• Traffic impactsTraffic impacts

• Regular deliveriesRegular deliveries

• Must insure quality is maintained Must insure quality is maintained during deliveryduring delivery

• Tanks needed at houses or more Tanks needed at houses or more frequent deliveriesfrequent deliveries

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• 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

Next Steps in

Evaluation Process