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i <br /> Ground Water Information <br /> Depth and Gradient <br /> Live Oak reviewed ground water elevation information available from the San Joaquin <br /> County Flood Control and Water Conservation District to determine the ground water <br /> levels near the Site. Data from spring and fall of 2010 were the most recent available <br /> from this source. According to an analysis of these maps (Plates 5 and 6), ground <br /> water elevation is 45 to 50 feet above mean sea level; ground water flows down to the <br /> northwest at a rate of approximately eight to 10 feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 110 feet, the depth to water <br /> below the Site is estimated to range between 60 to 65 feet. <br /> Potential Ground Water Contamination Issues <br /> The Soil Suitability Study ino intend -to be an investigation into ground-water <br /> contamination sources, and no sucTi inv tse gation was conducted. Many sources can <br /> contribute to ground water contamination, including leaking underground storage tanks, <br /> agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural <br /> activities and the use of septic systems in the area are known ground water <br /> contamination sources with the potential to impact the Site. <br /> Live Oak reviewed the EHD's Water Well Data Table dated March 10, 2009 for r <br /> addresses that have been tested for nitrate and dibromochloropropane (DBCP) One <br /> near y w I was identified just over one-quarter mile from the Site. DBCP was detected <br /> in the-wefl at a concentration q 1.9 parts per billion (ppb),'INitrate as NO3 was detected <br /> in the well at concentration f 74:parts per million (ppm)!—The Maximum Contaminant <br /> Level (MCL) set by the USE A for nitrate as NO3 is 45 ppm; the MCL for DBCP is 0.2 <br /> ppb. <br /> On-Site Wells <br /> One irrigation ell exists on the Site, as depicte on Plate 2. It is not in use at the <br /> resen No well permits for the Site were me the San Joaquin County <br /> Environmental Health Department. <br /> Water Sample <br /> Because therd-is no.powers pply to the irrigation well at this time, no water sample was <br /> collected as part of�thistudy. <br /> LOGE 1110 Page 3 <br />