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Expected On-Site Maximum Septic Tank Usage <br /> ,/Maximum expected usage on the Site would be from the winery building, the existing <br /> residence, and an additional 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 /> 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 fall of 2008 and spring of 2009 were the most recent <br /> available from this source. According to an analysis of these maps (Plates 5 and 6), <br /> ground water elevation is 20 to 30 feet below mean sea level; ground water flows <br /> toward the north at a rate of 7.4 to 9.5 feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 95 feet, the depth to water <br /> below the Site is estimated to be 115 to 125 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 /> /Two domestic wells and one irrigation well exist on the Site, as depicted on Plate 2. <br /> Oise well permit was found at San Joaquin County Environmental Health Department. <br /> This permit,-dated--January 1991, is for the installation of a new domestic well at the <br /> residence. It is included in Appendix 4. <br /> Water Sample <br /> vA water sample was collected from the domestic well on the Site on January 28, 2010 <br /> by 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 /> LOGE1003 Page 3 <br />