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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). The second unit dwelling is <br /> connected to the system through a lift station. <br /> Proposed Septic System <br /> The Holguins plans to build a new septic system for the existing second unit dwelling. <br /> On-Site Septic Permit History <br /> The San Joaquin County Environmental Health Department septic permit files were <br /> searched for the Site address. No septic permits were identified. <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 close to 500 septic systems <br /> per square mile are located in the immediate vicinity of the Site. The Site is located <br /> within a residential neighborhood, most parcels appear to be one-third to two acres in <br /> size. <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 and/or sumps. The septic permits can be found in Appendix 4 of <br /> this report. <br /> Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage on the Site would be from the current residents of the Site. <br /> Septic system design should be based on the San Joaquin County On-Site Wastewater <br /> Treatment Systems Standards (2017) or other engineering recommendations. <br /> LOGE 20-49 Page 2 <br />