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rvF Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected septic usage on the Site would be from the existing and future <br /> residential uses. Septic system design should be based on the On-Site Wastewater <br /> Disposal Standards (2003) or other engineering recommendations. <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 2009 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 two feet above to ten feet below mean sea level, depending on the <br /> season; ground water flows down to the northeast at a rate of approximately five feet <br />�( per mile in the vicinity of the Site. <br /> f <br /> Given that the ground elevation of the Site is approximately 30 to 35 feet, the depth to <br /> water below the Site is estimated to range between 28 to 45 feet. <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 /> On-Site Wells <br /> One domestic well and one irrigation well exist on the Site, as depicted on Plate 2. No <br /> well permits for the Site were identified at the San Joaquin County Environmental <br /> Health Department. <br /> Water Sample <br /> A water sample was collected from the domestic well on the Site on August 6, 2010 by <br /> Jessen Welch of Live Oak. The sample was to be analyzed for nitrate and <br /> dibromochloropropane (DBCP) per San Joaquin County Environmental Health <br /> Department policy.. <br /> As required by the laboratory, the sample was collected in a plastic container and two <br /> glass vials for nitrate and DBCP analysis, respectively. A trip blank was also utilized. <br /> LOGE1015 <br /> Page 3 <br /> 6 <br />