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Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> One septic system is currently located on the Site to serve the existing house. <br /> Proposed Septic System <br /> A new septic system will be constructed 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. One permit was identified. The permit, dated December <br /> /2017, was for a new residential septic system. The system utilized a 1,600-gallon <br /> septic tank, three 85-foot leach lines, and three 48-inch diameter by 25-foot deep <br /> seepage pits. The permit is included in Appendix 4. <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 130 septic systems <br /> per square mile are located in the immediate vicinity of the Site. <br /> The area surrounding the Site consists of rural residential lots, grazing land, and <br /> vineyard. <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 and 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 existing and proposed <br /> residences. Septic system design should be based on the San Joaquin County On-Site <br /> Wastewater Treatment Systems Standards (2017) or other engineering <br /> recommendations. <br /> LOGE 1933 Page 2 <br />