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Existing and Proposed Septic Tank Usage Existing Septic System One septic system is currently located on the Site (Plate 2). Proposed Septic System Mr. Judge has no current plans for construction. He indicated that at some point in the future he might want to build a small office/shop/storage building for the trucking business on the Site (personal communication, July 26, 2022). A new septic system would be installed for the new building. On -Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses. Two septic permits were identified: • October 2000 permit for destruction of septic system from demolished house. • November 2002 permit for new residential septic system at modular home. The system utilized a 1,200 -gallon tank, three 40 -foot leach lines, and three 36 -inch diameter by 25 -foot deep seepage pits. 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 54 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists of mixed rural residential, agricultural, and commercial/industrial land. 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; one permit indicated leach lines with sumps. The septic permits can be found in Appendix 4 of this report. LOGE 2236 Page 2