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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 3). <br />Proposed Septic System <br />No new septic systems are planned. <br />On-Site Septic Permit History <br />The San Joaquin County Environmental Health Department septic permit files were <br />searched for the Site address. One septic permit was identified. The permit, dated <br />December 2006, was for a new residential septic system. The system included a 1,200- <br />gallon tank and three 100-foot leach lines. The permit has been included in Appendix 4. <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 eight septic systems <br />per square mile are located in the immediate vicinity of the Site. <br />The Site is located within an agricultural area with scattered rural residences. <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. 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 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. No new <br />construction is anticipated. <br />LOGE 2121 Page 2