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ZtN <br /> Z <br /> The primary uses of groundwater in the area include irrigation and both private and municipal <br /> water supply. The "older alluvium" is the most extensively developed geologic unit in the <br /> Modesto area and hosts both unconfined and confined zones. The unconsolidated, mostly coarse <br /> grained nature of the aquifer material allows high yields to be sustained. Specific capacities of <br /> wells completed in the older alluvium average 42 GPlvflft (USGS Professional Paper, 1401-D, <br /> 1989). <br /> Regional groundwater now in the site area is expected to be in a northwesterly direction, toward <br /> the San Joaquin River Delta and a regional groundwater depression centered about 4 miles east <br /> of Stockton(San Joaquin County Flood Control and Water Conservation District, Fall 1990). <br /> Published data from the San Joaquin Flood Control and Water Conservation District (Fall 1990) <br /> indicate that the nominal depth to groundwater at the site should be approximately 60 feet below <br /> grade. The continuing drought has, however, lowered water levels valley wide and at the site. <br /> Estimated current depth to groundwater at the site is greater than 60 feet below grade. <br /> 2.4 Proximity of Private, Municipal, and Irrigation Wells: <br /> Well location data within a 112 mile radius of the site was obtained from the California <br /> Department of Water Resources (DWR). Well data'revealed the presence of 8 wells including <br /> 1 domestic well, 1 industrial well,3 municipal wells, and 3.destroyed .wells: t The nearest well`: <br /> m1sicipai well located approximately 100 feet northeast of the project site(Figure 3).,;This <br /> well las located visually as the DWR well search did not identify the well, The information <br /> provided by DWR did not provide accurate locations of any of the wells. <br /> 3.0 METHODS AND PROCEDURES <br /> 3.1 Drilling Activities <br /> Five vertical and one angle soil borings were drilled to maximum depths of 46 feet and 12.5 <br /> feet, respectively to further assess subsurface conditions at the project site (Figure 4). <br /> Drilling was conducted by Spectrum Exploration Company (C57 License #596545) rising a <br /> hollow-stem auger drill rig. An experienced field geologist was present to continuously log-all <br /> FPR 12D5.T1L <br />