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Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> No septic systems are currently located on the Site. <br /> Proposed Septic System <br /> A septic system will be constructed to serve the new house. <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 permit for septic system destruction, dated October <br /> 2018, was identified. It appears that a mobile home on the Site was demolished around <br /> the same time. The permit has 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 15 septic systems per <br /> square mile are located in the immediate vicinity of the Site. <br /> The vicinity of the Site is primarily composed of vineyards, agricultural land, and rural <br /> 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 future 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 20-36 <br /> Page 2 <br />