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Existing and Proposed Septic Tank Usage Existing Septic System Two septic systems are currently located on the Site (Plate 3). Proposed Septic System No new septic systems are planned. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Two septic permits were identified.. • June 1990 permit for new residential septic system (20290). The system utilized a 1,600-gallon septic tank and three 80-foot leach lines. • May 2005 permit for new residential septic system (20306). The system utilized a 2,000-gallon tank and four 80-foot leach lines. These permits have been included in Appendix 4. Existing Septic Tank Usage in the Vicinity To estimate the septic system usage in the area, our office counted septic systems that exist within approximately one square mile surrounding the property. Air photo imagery from Google Earth was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that at least 24 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within an agricultural area with scattered rural residences. Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, most septic systems in the area utilize leach lines or leach lines with sumps; one permit indicates leach lines with filter beds. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the current residents of the Site. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 2111 Page 2