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4.6 WATER RESOURCES Miti ag tion 4.6-1 If a public water system is required by San Joaquin County for all or a portion of the development, a water system permit shall be obtained from the San Joaquin County Public Health Services. Impact 4.6-2 The project proposes to contain and utilize all runoff from Jahant Slough. Currently during dry and normal years most of the runoff from Jahant Slough is trapped in Tracy Lakes and does not enter the Mokelumne River. During wet or above average rainfall years, Tracy Lakes fill and some water is discharged into the Mokelumne River. Under project conditions,during wet or above average winters the enlarged Tracy Lakes would trap water that would normally drain into the Mokelumne River and then into the Delta. However, during very wet years (e.g., 1986)Tracy Lakes would not be able store all of the runoff and water would need to be released into the Mokelumne River adding to the outflow of the Delta. The water containment in average to slightly above average rainfall years would impact the outflow to the lower reaches of the Mokelumne River and the Delta. An appropriative permit would be needed from the Division of Water Rights, which will determine whether this water surplus is available for appropriation. Miti ag tion 4.6-2 The applicant should apply for and obtain an appropriative water right permit for the increased storage of runoff from Jahant Slough or from diversion of runoff from the Mokelumne River. This will include the completion of any studies, as required by the State Division of Water Rights, including determination of the availability of such water in Jahant Slough and the lower reaches of Mokelumne River for appropriation. Impact 1 4.6-3 The project seeks to augment runoff either by pumping water from the Mokelumne River or by utilizing groundwater. The project would increase the demand for pumping groundwater or summer riparian diversions during dry and drought periods. If the project takes water under a riparian right, it may impact other downstream users and habitats by diverting a significant percentage of the dry season streamflow. Many of the surrounding farmers depend upon groundwater for agricultural production. If large amounts of groundwater are pumped during extended droughts,this could produce a drawdown effect on nearby 4.6-17