Program Element 2

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Program Element 2 Develop and Implement a
Comprehensive Recharge Program Current Status and
Future Prospects
April 27, 2009
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Outline

• We will answer the following questions pertaining
  to Program Element 2
• What is the present project condition?
• What are the future plans?
• What are the projected time limits for the
  formulation and implementation?
• What are the future anticipated problems in
  implementation?

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What is the Present Project Condition?

• Groundwater production projections
• Replenishment projections
• Storm water recharge
• Effective supplemental water recharge capacity
• Conclusions

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Groundwater Production Projections based on IEUA
Investigation Completed in September 2008
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What is the Present Project Condition?
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What is the Present Project Condition?

• Where did the new storm water recharge estimate
  of 6,000 acre-ft/yr come from?

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What is the Present Project Condition?

• What is the effective supplemental water recharge
  capacity relative to the required supplemental
  water recharge capacity?

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The Effective Supplemental Water Recharge
Capacity is Most Sensitive to MWD Replenishment
Water Availability
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Current Status of Replenishment Capacity Assuming
Replenishment Water Service from MWD at
30(acre-ft/yr)
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What is the Present Project Condition?

• Conclusion No. 1 The reliability of
  replenishment water service from MWD is not
  adequate to meet future replenishment needs and
  to meet the dilution requirements for recycled
  water recharge.
• The reliability of supplies for replenishment
  purposes will need to be about 90 percent to meet
  the overall supplemental water recharge needs of
  the basin.
• Watermaster and the stakeholders should consider
  improving the reliability of the imported water
  used for replenishment.

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What is the Present Project Condition?

• Conclusion No. 2 The theoretical maximum
  supplemental recharge capacity of the spreading
  facilities available to Watermaster is about
  92,000 acre-ft/yr but is limited by the turnout
  capacity of CB13 to about 79,000 acre-ft/yr.
• The recharge capacity of the San Sevaine Basins
  is about 50 cfs. CB13 was initially rated at 30
  cfs but can only be operated to 23 cfs, or less
  than half the recharge capacity of the basin.
• Watermaster and the stakeholders should consider
  improving the CB13 turnout to increase the
  supplemental recharge capacity of the basin.

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What is the Present Project Condition?

• Conclusion No. 3 New spreading basins are not
  required to meet future replenishment
  obligations. New ASR wells may likely be
  necessary to focus replenishment in areas of high
  groundwater production to sustain production
• Cucamonga Ontario pumping depression
• Jurupa pumping depression
• Chino subsidence area
• Monte Vista Pomona subsidence area

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What is the Present Project Condition?

• Conclusion No. 4 IEUA is currently planning to
  recharge 28,000 acre-ft/yr of recycled water.
  With the present reliability of MWD replenishment
  water of 30 percent, only about 7,500 acre-ft/yr
  of recycled water can be recharged in the Chino
  Basin.
• If the reliability of MWD imported water used for
  replenishment were increased to 90 percent, only
  about 16,000 acre-ft/yr of recycled water can be
  recharged in the Chino Basin.
• Watermaster and the stakeholders should consider
  increasing the recycled water contribution that
  in turn will reduce the need to acquire
  additional firm imported supplies.

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What is the Present Project Condition?

• Conclusion No. 5 Storm water has not been
  optimized. The facilities and operating plans
  envisioned in the 2000 Recharge Master Plan have
  not been completely implemented.
• Improvements were down scaled to reduce
  construction costs
• Operations and maintenance have not been
  optimized. There is no nexus between the value
  of storm water conserved and maintenance cost.

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What are the Future Plans?
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What are the Future Plans?

• Complete the 2010 Recharge Master Plan and update
  every five years thereafter
• Implement the 2010 Recharge Master Plan that will
  contain the following
• Increasing water conservation
• Securing additional reliable replenishment
  supplies
• Improving hydraulic capacity to get more imported
  water to the Chino Basin and to recharge
  facilities
• Constructing aquifer storage and recovery (ASR)
  wells in key areas
• Aligning (or increasing) investments in storm
  water recharge to the value of avoided
  supplemental water recharge

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What are the Projected Time Limits for the
Formulation and Implementation?
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What are the Projected Time Limits for the
Formulation and Implementation?

• Complete the 2010 Recharge Master Plan
• Will be completed by July 1, 2010
• Implement the 2010 Recharge Master Plan
• Recommended implementation time line will be
  included in Master Plan
• Agreements among the parties will need to be
  developed to implement the 2010 Recharge Master
  Plan
• Could take to 2012 or 2013 to complete these
  agreements and begin implementation

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What are the Future Anticipated Problems in
Implementation?
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What are the Future Anticipated Problems in
Implementation?

• Availability of imported water
• MWD cannot supply enough imported water we need
  to secure access to non MWD imported water
  sources
• Related challenges cost, environmental issues,
  wheeling capacity
• Hydraulic capacity in MWD pipelines
• MWD will not commit to delivering replenishment
  water in the quantities required by Watermaster
  due to capacity limitations in the Rialto Pipeline

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What are the Future Anticipated Problems in
Implementation?

• Equity issues
• Judgment provides for equal access to groundwater
• Replenishment capacity is driven by supply
  reliability, recharge capacity, growth, and
  business interests of the parties
• Unclear how to distribute the new costs
  associated with meeting future replenishment
  capacity
• Cost and funding
• The types of facilities anticipated include ASR
  wells, new treatment plant capacity for imported
  and recycled water, pipelines, basin improvements
• New water rights and or long term water transfer
  contracts
• Capital cost could easily exceed 200 million

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