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n <br /> The general area consists of farmland, vineyards, and rural residential properties. <br /> 1 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, and seepage pits. The septic permits can be found in <br /> Appendix 4 of this report. <br /> Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage on the Site would be from the winery building, the two <br /> residences, and an additonal dwelling unit. 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 /> LOGE 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 fall of 2008 and spring of 2009 were the most recent <br /> available from this source. According to ars analysis of these maps (Plates 5 and 6), <br /> ground water elevation is 20 to 30 feet below mean sea level; ground water flows down <br /> to the north at a rate of 5.6 to 6.5 feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 102 feet, the depth to water <br /> below the Site is estimated to be 122 to 132 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 were found during a recent file review at San Joaquin County <br /> Environmental Health Department. <br /> LOGE0915 Page 3 <br />