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■ estimate seasonal and long-term availability of runoff from Jahant Slough, divertable water in the Mokelumne River, and groundwater; ■ calculate the effects of groundwater pumping at the site on flow in the Mokelumne River, regional groundwater levels, and pumping capacity of wells on adjacent property; and ■ estimate the effects of diversions from the Mokelumne River on flow regime. Water Quality The principal water quality concerns related to the project are: ■ suitability of water from the three possible sources for irrigation, drinking, and aquatic habitat; ■ the potential for contamination of groundwater or the lakes from septic tank leachate, onsite irrigation-return flow, urban runoff from developed areas, or inflow of agricultural tailwater from adjacent property; and ■ the potential effects of temperature variations, nutrients, toxic compounds, and suspended sediment on the aquatic ecosystem of the lakes. To investigate these issues, Jones & Stokes Associates will perform the following tasks: ■ review existing groundwater and surface water quality data available from San Joaquin County, the California Department of Water Resources, and U.S. Geological Survey; ■ interview local farmers and agency personnel to identify agricultural or other chemicals used on and around the site; ■ collect one water sample from an onsite well and analyze it for compliance with drinking water limits in Title 22 of the California Code of Regulations; ■ collect up to four samples of agricultural tailwater entering the beaver pond and runoff from Jahant Slough (if flow is occurring during the study period) and U analyze them for no more than four likely agricultural contaminants such as organo chlorine, organophosphate, and carbonate; ■ estimate the potential for contamination of domestic wells or the lakes by septic tank leachate, irrigation-return flow, or urban runoff from developed areas; III-13