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Expected On-Site Maximum Septic Tank Usage <br /> ] Maximum expected septic usage on the Site would be from the existing and any future <br /> residential uses. No construction is planned. Septic system design should be based on <br /> the On-Site Wastewater Disposal Standards (2003) or other engineering <br /> 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 25 to 30 feet above mean sea level; ground water flows down to the <br /> northwest or west at a rate of three to five feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 55 to 60 feet, the depth to <br /> water'below the Site is estimated to range between 25 to 35 feet. <br /> Potential Ground Water Contamination Issues <br /> The Soil Suitability Study is not intended to be an investigation into ground-water <br /> E 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 two irrigation wells exist on the Site, as depicted on Plate 2. <br /> One well permit for the Site was identified at the San Joaquin County Environmental <br /> Health Department. This permit, dated March 1976, is for the installation of a new <br /> domestic well at the residence. The permit has been included in Appendix 4. <br /> Water Sample <br /> A water sample was collected from the domestic well on the Site on May 6, 2010 by <br /> David Welch. The sample was to be analyzed for nitrate and dibromochloropropane _ <br /> (DBCP) per San Joaquin County Environmental Health 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 /> LOGE1010 Page 3 <br />