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Existing Septic Tank Usage in the Vicinity <br /> To estimate the existing septic system usage in the area, our office counted septic <br /> systems that exist within approximately four square miles surrounding the property. Air <br /> photo imagery from GoogleEarth;" was used. Each building cluster on the photo was <br /> assumed to have one septic system. Based on this method, it is estimated that at least <br /> six septic systems per square mile exist in the vicinity of the Site. <br /> The general area consists of orchards and open farmland with occasional rural <br /> residences. <br /> 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 /> primarily utilize leach lines or leach lines with sumps. One nearby system utilizes 25- <br /> foot seepage pits. The septic permits can be found in Appendix 4 of this report. <br /> Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected septic usage on the Site would be from the existing systems and <br /> any future residential uses. Septic system design should be based on the On-Site <br /> Wastewater Disposal Standards (2003) or other engineering recommendations. <br /> Ground Waiter 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 2010 were the most recent available <br /> rom this source. According to are anaTysis b-f,these maps (Plates 6 and 7), ground <br /> water elevation is approximately 40 to 65 fee above mean sea level in the area. <br /> Ground water flows down to the northeast in the vicinity of the Site; the gradient could <br /> not be calculated because the area is not fully mapped. <br /> Given that the ground elevation of the center of the Site is approximately 140 feet, the <br /> depth to water below the center of the Site is estimated to range between 80 feet (fall) <br /> to 95 feet (spring), depending on the time of year_ <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 /> LOGE 1118 Page 3 <br />