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Proposed Septic System <br />A new septic system will be constructed for the new house (Plate 2). <br />On -Site Septic Permit History <br />The San Joaquin County Environmental Health Department septic permit files were <br />searched for the Site address. Two septic permits were identified: <br />• July 1975 permit for a repair to a residential septic system. One 50 -foot leach <br />line and a sump were added to the existing system. <br />• November 1999 permit for destruction of old septic tank and installation of new <br />1,600 -gallon tank. <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 85 septic systems per <br />square mile are located in the vicinity of the Site. <br />The immediate area surrounding the Site consists of rural residential lots. Agricultural <br />land is located farther to the east and west. <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. One permit indicated leach lines with sumps, and one indicated leach lines <br />with 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 current and future residents of <br />the Site. 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 2237 Page 2 <br />