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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 />Mr. Ruiz 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. Two documents related to septic systems were <br />identified: <br />• Plot plan application dated January 1989 for new mobile home with septic <br />system. This mobile home is not currently on the Site. <br />• January 2016 permit for repair to existing septic system at residence. The permit <br />indicates a 1,200 -gallon septic tank and an existing leach field with a sump. <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 90 septic systems per <br />square mile are located in the immediate vicinity of the Site. <br />The Site is located within a rural residential area. Outside of the residential <br />neighborhood, many of the surrounding properties are orchards. <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 25 -foot deep seepage pits, though two permits indicate leach lines only and <br />one indicates leach lines and sumps. The septic permits can be found in Appendix 4 of <br />this report. <br />LOGE 2144 Page 2 <br />