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1.,. <br /> November 18. 1999 <br /> Job Number: 599307 <br /> Page 4 <br /> _ V. GROUND WATER <br /> The San Joaquin County Flood Control and Water Conservation District ground-water <br /> depth and elevation maps for Fall 1997 and for Spring 1998 indicates the most recent ground <br /> water levels for the north San Joaquin County and the Acampo area. These maps were used to <br /> determine the general depth and flow direction of regional ground water(Plates 2 though 5). <br /> The following table summarizes the all the available ground water information collected for the <br /> site and nearby area. <br /> Table: Summary of Available Ground Water Information <br /> Date,Source Groundwater Depth Notes <br /> November 9, 1999, Soil boring. No ground water <br /> Neil O. Anderson&Associates,Inc. found to 10 feet in <br /> deep. <br /> November 10, 1999,Ground water sample. No depth recorded Nitrate: 64 mg/L-NO,(14.2 mg/1-N) <br /> Neil O. Anderson&Associates,Inc. DBCP: ND <br /> March 11, 1999,Onsite monitoring wells. About 75 feet in depth <br /> Advanced GeoEm ironmental, Inc. in all three wells. <br /> Spring 1998, San Joaquin County Ground About 80 feet in depth Gradient about 12.5 feet/mile, <br /> Water Map. northeast <br /> Fall 1997, San Joaquin County Ground About 90 feet in depth Gradient about 12.5 feet/mile.east- <br /> Water Map. northeast <br /> Note: ND=Non-Dectable(or not found at detectable limits) <br /> The existing ground-water well is located about 120 feet west of the new proposed leach <br /> field area_ The well is reported to be 180 feet in total depth. The well drillers log, construction <br /> details, and production rate are not known. Three monitoring wells are located near the former <br /> underground tank site and near the existing water well. The depth to ground water was measured <br /> in March 1999 and were found to be at a depth of 75 feet. <br /> One ground water sample was collected from the existing water well on November 10, <br /> 1999 for testing. The sample was submitted to the FGL Environmental Laboratory and tested for <br /> the presence of dibromochloropropane (DBCP) and Nitrate(NO3) per County requirements. The <br /> test results indicated that DBCP was non-detectable(ND) and nitrate as NO3 found at 64 mgA <br /> — (14.2 mg/1-N). The Nitrate test exceed the maximum contaminate level set by the United States <br /> rpEtSO <br /> r t <br /> > w <br /> Z • <br /> O � <br /> S S O G <br />