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Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> One septic system is currently located on the Site (Plate 2). <br /> Proposed Septic System <br /> A new septic system will be constructed for the proposed ADU. <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 /> • October 1998 permit for a new residential septic system. The system included a <br /> 1,600-gallon septic tank, three 40-foot leach lines, and three 36-inch diameter by <br /> 25-foot-deep seepage pits. <br /> • October 1998 permit for a new residential septic system (redraw of previous <br /> permit). <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 123 septic systems per <br /> square mile are located in the vicinity of the Site. <br /> The general area surrounding the Site consists of rural residential lots and vineyards. <br /> The Lodi Airport is located approximately one-quarter mile 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 and seepage pits. The septic permits can be found in Appendix 4 of this report. <br /> LOGE 2312 Page 2 <br />