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Existing Septic Tank Usage in the Vicinity <br />To estimate the septic system usage in the area, our office counted septic systems that <br />exist within approximately four square miles surrounding the property. Air photo <br />imagery from Google Earth was used. Each building cluster on the photo was assumed <br />to have one septic system. Using this method, it is estimated that at least 33 septic <br />systems per square mile are located in the immediate vicinity of the Site. <br />The Site is located within a mixed agricultural and rural residential area. The <br />surrounding properties are mainly vineyards, orchards, and rural residences. <br />Septic Permit History in the Vicinity <br />Based on a review of septic permits on file at the San Joaquin County Environmental <br />Health Department for nearby properties, most septic systems in the area utilize leach <br />lines with 25-foot deep seepage pits. The septic permits can be found in Appendix 4 of <br />this report. <br />Expected On-Site Maximum Septic Tank Usage <br />Maximum expected usage on the Site would be from the current and any future <br />residents of the Site. Septic system design should be based on the San Joaquin <br />County On-Site Wastewater Treatment Systems Standards (2017) or other engineering <br />recommendations. No new construction is anticipated. <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 the fall of 2017 and the spring of 2018 were the most <br />recent available from this source. According to an analysis of these maps (Plates 5 and <br />6), ground water elevation is approximately 35 feet below mean sea level. Ground <br />water appears to flow to the north or northeast at a rate of approximately 7 feet per mile. <br />Given that the ground elevation of the Site is approximately 75 to 83 feet above mean <br />sea level, the depth to water below the Site is estimated to be approximately 110 to 118 <br />feet. <br />LOGE 2062 Page 3