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June 11 2003 <br /> Job Number:LG03-137 <br /> " Page 3 <br /> 4.0 GROUND WATER <br /> Currently, there i-s-one (1) operating water well located on the property. The well is located on <br /> the north side of the.existing office building (Plate 1). We understand the well supplies the <br /> drinking water for the facility. According to the file search of the permits for the site, the well <br /> was drilled in early 1980. The pump was replaced in 1989. <br /> The San Joaquin County Flood Control and'Water Conservation District(1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the groundwater levels near the site. <br /> The Fall.1998 and Spring 1999 maps are the most current maps available from the county. The <br /> maps do not indicate the ground water level of the Tracy area. -Ground water was encountered <br /> within percolation test P-2 at a depth of 9.5 feet on June 3, 2003. Table 2 summarizes all the. <br /> available ground water information collected for the site and nearby area. <br /> Table 2. <br /> Summary of Available Ground Water Information. <br /> Date,Source ' Groundwater Depth Notes <br /> Three borings: 2 3-feet percolation test Groundwater <br /> borings and one and 10-foot deep encountered at a depth <br /> ground water boring. Neil 0.Anderson of 9.5 feet at P-2 <br /> &Associates,.Inc. June 3,•2003. <br /> Water sample obtained on June 3,2003 Water tested for Nitrate and coliform, <br /> from the onsite well located at 7890.W. Nitrate: 76 tng/L-NO3,MCI,45 mg/L- <br /> even th Street,Tracy,CA. NO3, (or 16.8'mg/L-N,MCL 10 mg/L-N) <br /> Coliform was not detected. <br /> 4 <br /> Z <br />