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. Proposed Septic System <br /> A new septic system is proposed to serve the new house. <br /> On-Site Septic Permit History <br /> The San Joaquin County Environmental Health Department septic permit files were <br /> searched for the Site address. No permits were identified. <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 50 septic systems per <br /> square mile are located in the immediate vicinity of the Site. <br /> The general area consists of rural residences, orchards, and irrigated pasture. Several <br /> dairies are located nearby, the closest one approximately 800 feet southwest of the <br /> Site. <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 sumps. 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 proposed four-bedroom house. <br /> Septic system design should be based on the San Joaquin County On-Site Wastewater <br /> Treatment Systems Standards (2017) or other engineering 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 10 to 24 feet above mean sea level; ground water <br /> flows predominantly toward the southeast at a rate of approximately 11 to 14 feet per <br /> mile in the vicinity of the Site. <br /> • LOGE 1901 Page 2 <br />