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Existing and Proposed Septic Tank Usage Existing Septic System A septic system currently exists on the Site. Proposed Septic System A new septic system will be constructed to serve 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 permit, dated September 1993, was identified. The permit indicates that a new septic system was installed at a residence. The system utilized a 1,600-gallon septic tank, three 40-foot leach lines, and three 36-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 25 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists of mostly of vineyards, with rural residences located along the roadways. Wineries are located approximately one-half mile to the north and south 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 and 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 would be from the existing and proposed residences. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 1934 Page 2