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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 at this time. Septic system design should <br /> be based on 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 fail 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 40 feet below mean sea level; ground water flows down to the <br /> north or northwest at a rate of four to five feet per mile in the vicinity of the Site. <br /> Given that the ground elevation of the Site is approximately 85 feet, the depth to water <br /> below the Site is estimated to range between 110 to 125 feet, depending on the season. <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, 2� <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. Two <br /> well permits for the Site was identified at the San Joaquin County Environmental Health <br /> Department. The first permit, from 1994, is for pump replacement at an irrigation well. <br /> The second permit, from 1997, is for pump repair at a domestic well. The permits have <br /> been included in Appendix 4. <br /> Water Sample <br /> A water sample was collected from the domestic well on the Site on July 27, 2010 by 3� <br /> .lessen 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 /> LOGE1017 Page 3 <br />