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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. Serna plans to construct 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. One permit was identified. The permit, dated November 1974, was for the construction of a new residential septic system with a 1,200-gallon septic tank and three 70-foot leach lines. The permit has been included in Appendix 4. 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 50 septic systems per square mile are located in the immediate vicinity of the Site. The vicinity of the Site is composed of agricultural land and rural residences on the west side of Interstate 5; on the east side of the highway is a commercial/industrial area. 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. 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 2109 Page 2