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Septic Permit History in the Vicinity <br /> ) Based on a recent review of septic permits on file at the San Joaquin County <br /> Environmental Health Department for nearby properties, the septic systems in the area <br /> appear to utilize leach lines, pits and sumps. The septic permits can be found in <br /> Appendix 5 of this report. <br /> Expected On-Site Maximum Septic Tank Usage <br /> /Maximum expected usage on each proposed parcel would be for a primary residence <br /> and second dwelling unit. Septic system design should be based on the On-Site <br /> Wastewater Disposal Standards (2003) or other engineering recommendations. <br /> Ground Water Information <br /> Depth and Gradient <br /> /LOGE reviewed ground water elevation information available online from the San <br /> Joaquin County Flood Control and Water Conservation District to determine the ground <br /> water levels near the Site. Data from fall of 2007 and spring of 2008 were the most <br /> recent available from this source. According to these maps (Plates 5 and 6), ground <br /> water elevation is 10 to 20 feet below mean sea level; ground water flows down to the <br /> south-southeast at a rate of 10 to 20 feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 70 feet, the depth to water <br /> below the Site is estimated to be 80 to 90 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 /> I On-Site Wells <br /> One domestic well and one irrigation well exist on the Site, as depicted on Plate 2. <br /> Three well permits were found during a recent file review at San Joaquin County <br /> Environmental Health Department. The first permit, from 1982, was for a new domestic <br /> well and pump installation. The second permit, from 1987, was for a new irrigation well. <br /> The third permit, from 1997, was for a new irrigation pump. <br /> LOGE0911 Page 3 <br />