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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 A new septic system will be constructed for the new house. On -Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. One septic permit was identified. The permit, dated November 1975, was for a new domestic septic system utilizing a 1,600 -gallon tank, three 40 -foot leach lines, and three 42 -inch diameter by 25 -foot deep seepage pits. The permit has 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 110 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within an area primarily composed of large lot 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 with 25 -foot deep seepage pits; one system utilized a 17 -foot deep sump. 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. Septic system design should be based on the San Joaquin County On -Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 2210 Page 2