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Existing and Proposed Septic Tank Usage Existing Septic System There are currently no septic systems on the Site. Proposed Septic System Mr. Phillips plans to install a new septic system for the new residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. No septic permits were identified. 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 72 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within an area of rural residences on grazing land. Further from the Site is agricultural land, including vineyards to the west and south. 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, septic systems in the area utilize leach lines with 33- to 42-inch diameter 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 will be from the 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. Ground Water Information Depth and Gradient Live Oak reviewed ground water elevation information available from the San Joaquin County Flood Control and Water Conservation District to determine the ground water LOGE 20-27 Page 2