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Water Ouality The water quality of the water at the project site currently meets state and federal drinking water standards (Reese-Chambers 1981) . However, as the area's population increases, groundwater extraction rates would increase, creating a potential overdraft situation and saline water' intrusion into the fresh water zones from the Delta area to the west. The use of greater amounts of surface water should help to alleviate this problem. Impacts and Mitigation Measures Impact 1 - Runoff Increased runoff would result from the proposed development due to increased impervious surface area. Unless diverted, this additional runoff could aggravate the potential for the flooding of Weber Slough. The retention pond proposed for the facility would be used to collect and temporarily hold excess storm water resulting from the 20-acre project area, except the waste oil recovery area. Storm runoff would then be discharged to Weber Slough. The retention pond would be 250 feet by 300 feet and two to three feet deep and would not be lined. Thi s would be equivalent to a capacity of 1.12 million gallons to 1.68 million gallons. The resource recovery area would have its own liquid disposal system. Refer to the System Safety/Hazardous Materials section of the EIR for a discussion of the waste recovery area. Diversion ditches and graded slopes would be added to areas outside the project area to direct rainwa- ter runoff to Weber Slough. Mitigation Measures. No mitigation measures, other than those already proposed by the applicant, are needed for runoff impacts because the drainage system proposed for the Falcon Energy project should be able to reduce the speed and amount of runoff leaving the site during a heavy storm to an insignificant level . However, the design of final drainage plans and mitigation measures should be coordinated with the San Joaquin County Department of Public Works. 3-41 101-45.R4 4/10/89