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Existing and Proposed Septic Tank Usage <br />Existing Septic System <br />No septic systems are currently located on the Site. <br />Proposed Septic System <br />Mr. Ellis plans to build a new septic system for the new residence. <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 20 septic systems per <br />square mile are located in the immediate vicinity of the Site. <br />The Site is surrounded by vineyards with 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 or leach lines with sumps. The septic permits can be found in Appendix 4 of this <br />report. <br />Expected On -Site Maximum Septic Tank Usage <br />Maximum expected usage on the Site would be from the future residents of the Site. <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 the fall of 2017 and the spring of 2018 were the most <br />LOGE 2103 Page 2 <br />