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• April 2004 permit for new 1,200-gallon septic tank to replace old tank at grease <br /> trap. <br /> These permits have been included in Appendix 4 of this report. <br /> 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 53 septic systems per <br /> square mile are located in the immediate vicinity of the Site. <br /> The Site is located in a mixed agricultural, rural residential, and commercial/industrial <br /> area. Mobile home parks are located adjacent to the west, southwest, and 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, most septic systems in the area utilize leach <br /> lines only; two permits indicated filter bed systems, and one indicated leach lines with <br /> 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 usage on the Site would be from the future employees and <br /> customers 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. <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 spring and fall of 2021 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 approximately 15 to 38 feet below mean sea level in the area. <br /> Ground water appears to flow generally to the northwest or southwest in the area at a <br /> rate of approximately 2.5 to 5 feet per mile. <br /> Given that the ground elevation of the Site is approximately 47 to 50 feet above mean <br /> sea level, based on these maps the depth to water beneath the Site is estimated to be <br /> LOGE 2240 Page 3 <br />