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Existing and Proposed Septic Tank Usage Existing Septic System A septic system is currently located on the Site to serve the existing house (Plates 2 and 3). Proposed Septic System A new septic system will be constructed for the proposed ADU (Plate 2). On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses; two permits were identified: • July 2025 permit for repair to residential septic system. Two 40-foot leach lines and four 36-inch diameter by 25-foot-deep seepage pits were added to the existing system (22124 Butler). • October 1999 permit for "hooking new house to existing septic" (512 Hewitt). These permits have been included in Appendix 4 of this report. 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 100 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located in the small rural residential neighborhood of Peters, bordered on all sides by agricultural land (orchards, pasture, and fodder crops). 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 with seepage pits. 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 and future residents of the Site. The new septic system design should be based on the San Joaquin County LOGE 2611 Page 2