Chino Basin Watermaster Large-Scale Storage and Recovery Program Master Plan Scope of Work July 23, 2003

Task Overview 1) Develop assumptions/criteria 2) Develop alternatives 3) Estimate hydrogeologic feasibility 4) Refine alternatives 5) Determine “value” of storage recovery 6) Report/workshops and Other

Task 1 - Develop Planning Assumptions and Basin Operating Criteria Revise asset inventory Revise asset inventory Update local producer water supply plans and projections Update local producer water supply plans and projections Describe 500,000 acre-ft storage program Describe 500,000 acre-ft storage program Finalize Task 1 Memorandum Finalize Task 1 Memorandum

Task 2 - Develop Initial Storage and Recovery Operational and Facilities Alternatives Describe in-lieu vs. export Describe in-lieu vs. export Evaluate 4 Alt. incl. 4-Cities PipelineEvaluate 4 Alt. incl. 4-Cities Pipeline Evaluate CDA expansion Evaluate CDA expansion Replenishment obligationReplenishment obligation Review storage and recovery prospects Review storage and recovery prospects CLWACLWA OthersOthers Develop cost opinions for all alternatives Develop cost opinions for all alternatives Support development of storage & recovery agreements Support development of storage & recovery agreements

Task 3 - Estimate the Hydrogeologic Feasibility of the Planning Alternatives Review planning alternatives Review planning alternatives Run groundwater simulations Run groundwater simulations Determine impacts on:Determine impacts on: Groundwater levels Groundwater levels Hydraulic controls Hydraulic controls Increase safe yield Increase safe yield Plume migration Plume migration

Task 4 - Refine Alternatives Refine operations and facility descriptions Refine operations and facility descriptions Stake holder meetingsStake holder meetings Refine cost opinions Refine cost opinions Prepare facilities description and cost estimate Prepare facilities description and cost estimate

Task 5 - Determine "Value" of Chino Basin Storage-Recovery Determine “value” Determine “value” Producer-Specific Facilities Cost ApproachProducer-Specific Facilities Cost Approach Regional Facilities Cost ApproachRegional Facilities Cost Approach Avoided Cost ApproachAvoided Cost Approach Methodology to apportion benefits Methodology to apportion benefits Conduct workshop Conduct workshop

Task 6 - 8: Report Preparation and Workshops and Other Prepare draft report Prepare draft report Conduct first workshop Conduct first workshop Update draft report Update draft report Conduct second workshop Conduct second workshop 24 meetings 24 meetings Prepare final report Prepare final report