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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 the spring and fall of 2011 were the most recent <br /> available from this source. According to an analysis of these maps (Plates 5 and 6), <br /> ground water elevation ranges from approximately 20 to 30 feet below mean sea level; <br /> based on the contours depicted in the vicinity, it was not possible to calculate a <br /> groundwater gradient. <br /> Given that the ground elevation of the Site is approximately 75 to 110 feet, based on the <br /> County ground water maps the depth to ground water below the Site is estimated to <br /> range between 95 to 140 feet, depending on the season and location on the Site. <br /> Potential Ground Water Contamination Issues <br /> The Soil Suitability Study is not intended to be an investigation into ground-water <br /> contamination sources, and no such investigation 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 nearby <br /> addresses that have been tested for nitrate and dibromochloropropane (DBCP). Four <br /> nearby wells were identified at addresses located within approximately one mile of the <br /> Site. All of the wells had been tested for DBCP. DBCP was detected in one well at a <br /> concentration of 1.8 µg/L; it was not detected in the other three. The Maximum <br /> Contaminant Level (MCL) set by the US EPA for DBCP is 0.2 tig/L. Three of the wells <br /> were tested for nitrate as NO3, it was detected in two of the wells at concentrations of <br /> 6.7 and 77.0 parts per million (ppm). Nitrate was not detected in the third well. The <br /> MCL set by the US EPA for nitrate as NO3 is 45 ppm. <br /> On-Site Wells <br /> No water wells are located on the Site. <br /> Water Sample <br /> No water sample was collected for this investigation. (t4zf—`t.6j <br /> LOGE 1209 Page 3 <br />