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Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> A septic system is currently located on the Site to serve the existing house (Plates 2 <br /> and 3). <br /> Proposed Septic System <br /> A new septic system will be constructed to serve the new ADU (Plate 2). <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 was identified. The permit, dated June 1956, <br /> was for a new residential septic system utilizing a 900-gallon septic tank, a 50-foot leach <br /> line, and a 33-inch diameter by 25-foot deep seepage pit. This permit has been <br /> 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 180 septic systems <br /> per square mile are located in the immediate vicinity of the Site. <br /> The Site is located in a mixed rural residential and commercial/industrial area, with <br /> some agricultural land. Nearby properties are rural residences, a landscaping business, <br /> a small orchard, and a mobile home park. <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; one permit indicated leach lines with sumps, and one indicated <br /> leach 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 and future residents of <br /> the Site. The new septic system design should be based on the San Joaquin County <br /> On-Site Wastewater Treatment Systems Standards (2017) or other engineering <br /> recommendations. <br /> LOGE 2620 Page 2 <br />