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August 31, 2004 <br /> NOA Project Number: E04060A <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) <br /> ground water depth and elevation maps were reviewed to determine the ground water levels <br /> near the Site. The Fall 1998 and Spring 1999 maps are the most current official maps available <br /> from the county. According to these maps (Plates 3-6), ground water lies between 10 and 20 <br /> feet below ground surface and flows at a gradient of three to five feet per mile to the southeast <br /> in the vicinity of the Site. <br /> 4.2 On-Site Ground Water <br /> One domestic and one agricultural well exist on the Site. No records of these wells were <br /> found during file review at EHD on July 21, 2004. No ground water was encountered by the <br /> staff of Neil O. Anderson & Associates, Inc. during the drilling of the percolation test holes to <br /> three-foot depths. <br /> 4.3 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work <br /> for the soil suitability study. Potential ground-water contamination can occur from a number <br /> of sources which often include leaky underground storage tanks, agricultural activities, dairies, <br /> septic systems, and storm water infiltration. <br /> Any past agricultural activities and the present use of septic systems in the area should be <br /> considered potential ground-water contamination sources. <br /> 4.4 Well Water Sample Location <br /> Three water samples were collected from an outside faucet fed by the on-site domestic water <br /> well on July 22, 2004 by Ms. Abigail Racco of our office. The locations of the well and water <br /> sample are indicated in Plate 1. <br /> 7 <br />