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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 New septic system(s) will be constructed for the new house(s). On -Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses. One septic document was identified: • August 1989 permit for new residential septic system. The system utilized a 1,600 -gallon tank, two 80 -foot leach lines, and two 4- by 6- by 10 -foot sumps. This 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 19 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists of orchards and agricultural land, with some rural residences. A large nursery is located across Austin Road northwest of the Site. 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. 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 2234 Page 2