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zones appears limited because they are separated by extensive low permeable sediment beds'. Depth to groundwater varies depending on location, season, and local influences. The shallowest groundwater is generally observed adjacent to the San Joaquin River, and groundwater depths tend to increase in depth away from the River. In the alluvial flood plain deposits, groundwater is typically observed within 12 feet of land surface. ' 1.4 Facilities and Proposed Monitoring Well Locations ' The current development area covered by the WDRs is divided into two general subareas: River Islands and Mossdale. Additionally, the WDRs cover existing ' and potential future treatment capacity planned north of Mossdale (within and north of the Central Lathrop Specific Plan area), and the Eastern and Southern Lathrop areas. A topographic map showing these areas, general facility ' locations (existing and planned), roads, and surface water bodies is provided in Figure 1. ' The City of Lathrop currently collects and reports groundwater level and water quality data from their approved monitoring well network within the general River Islands and Mossdale subareas. In the future, supplemental monitoring wells ' may be needed to evaluate groundwater conditions, establish background concentrations, and monitor for possible future groundwater impacts beneath planned land application and storage expansion areas. The locations and ' purposes for supplemental monitoring wells is beyond the scope of this report, and as specified in the WDRs shall be addressed in future Groundwater Well Project Description Addenda. The Well Project Description Addenda shall ' provide site specific information, describe the proposed change to the existing groundwater monitoring network, describe the well condition and its construction details, and refer to the well installation and/or destruction methods specified in ' this Master Well Workplan. 2.0 DRILLING DETAILS 2.1 Supervision of Drilling and Well Installation ' The WDRs require that 120 days prior to the scheduled construction of any groundwater monitoring well, the Discharger shall submit a Groundwater Well Project Description Addendum. The Well Project Description Addendum shall ' refer to the well construction methods specified in this Master Well Workplan. No network monitoring wells shall be installed or destroyed until approval to proceed is obtained from RWQCB staff. Page, R.W., 1985, Geology of the fresh groundwater basin of the Central Valley, California, with texture maps and sections. U.S. Geological Survey Professional Paper 1401-C. - 3 -