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Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> A septic system is currently located on the Site to serve the existing house (Plate 3). <br /> Proposed Septic System <br /> A new septic system will be constructed to serve the new ADU (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 permits were identified: <br /> • March 1969 permit for new residential septic system. The system utilized a <br /> 1,200-gallon septic tank and three 80-foot leach lines. <br /> • May 2009 permit for addition to residential septic system. A 40-foot leach line <br /> and two 36-inch diameter by 25-foot deep seepage pits were added to the <br /> existing system. <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 40 septic systems per <br /> square mile are located in the immediate vicinity of the Site. <br /> The vicinity of the Site is a mixture of rural residences and agricultural land. A mobile <br /> home park is approximately 900 feet to the south. <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 seepage pits, though one permit indicated leach lines with sumps and two <br /> indicated leach lines only. The septic permits can be found in Appendix 4 of this report. <br /> LOGE 2605 Page 2 <br />