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aquifer material results in high well yields Specific capacities of wells completed in the older <br /> alluvium average 42 GPM/ft (USGS Professional Paper, 1401-D, 1989) <br /> Regional groundwater flow in the site area is generally in a northwesterly direction, toward the San <br /> Joaquin River Delta and a regional groundwater depression centered about 4 miles east of Stockton <br /> ' (San Joaquin County Flood Control and Water Conservation District, Spring 1991) <br /> Published data from the San Joaquin Flood Control and Water Conservation District (Fall 1990) <br /> indicate that the average long term depth to groundwater at the site is approximately 60 feet below <br /> grade The continuing drought has, however, lowered water levels valley wide and at the site <br /> Current depth to groundwater at the site is approximately 67 feet below grade <br /> 1 24 <br /> Proximity of Private, Municipal, and Irrigation Wells: <br /> Well location data within a 1/2 mile radius of the site was obtained from the California Department <br /> of Water Resources (DWR) Well data revealed the presence of 9 wells including I domestic well, <br /> 1 industrial well, 3 municipal wells, 3 destroyed wells, and 1 other well The nearest well is a <br /> municipal well located approximately 100 feet northeast of the project site (Figure 3) This well was <br /> tlocated visually as the DWR well search did not identify the well The information provided by DWR <br /> did not provide accurate locations of any of the wells <br /> 3.0 FIELD INVESTIGATION <br /> ' 3.1 Phase I Activities <br /> On October 16 and 17, 1991, RESNA Industries (RESNA) personnel advanced five vertical and one <br /> angle soil borings to maximum depths of 46 feet and 12 5 feet, respectively to assess subsurface <br /> conditions at the project site (Figure 4) <br /> DnlIing was conducted by Spectrum Exploration Company (C57 License #596545) using a hollow- <br /> stem auger drill ng An experienced field geologist was present to continuously log all dnll cuttings <br /> and soil samples utilizing the Unified Soil Classification System Cored soil samples were collected <br /> at 5 foot intervals in the vertical borings and from the bottom of the angle soil boring Groundwater <br /> R-042992 TJL 3 <br />