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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 one square mile surrounding the property. Air photo imagery <br /> from Google Earth was used. Each building cluster on the photo was assumed to have <br /> one septic system. Using this method, it is estimated that at least 97 septic systems per <br /> square mile are located in the immediate vicinity of the Site. <br /> The area surrounding the Site consists of agricultural land and rural residential lots. A <br /> nursery is located adjacent to the north of the Site, and a dairy is located approximately <br /> one-third of a mile southeast. <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, septic systems in the area utilize leach lines <br /> and seepage pits or leach lines and sumps. The septic permits can be found in <br /> Appendix 2 of this report. <br /> Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage on the Site would be from the religious assembly facility and <br /> the existing residences. Septic system design should be based on the San Joaquin <br /> County On-Site Wastewater Treatment Systems Standards (2017) 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 fall of 2016 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 approximately 30 to 31 feet below mean sea level; ground water flows <br /> down to the south or south-southeast at a rate of approximately six feet per mile. <br /> Given that the ground elevation of the Site is approximately 26 to 28 feet above mean <br /> sea level, the depth to water below the Site is estimated to be approximately 56 to 59 <br /> feet. <br /> In its 2010 percolation testing report, TEST advanced a soil boring to 50.5 feet below <br /> ground surface. No ground water was encountered. <br /> LOGE 1939 Page 3 <br />