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Proposed Septic System Mrs. Carroll 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. Two septic permits were identified: • October 1970 permit for new residential septic system. The system utilized a 1,200-gallon septic tank, two 100-foot leach lines, and two 33-inch diameter by 25-foot deep seepage pits. • January 1982 permit for septic repair. A new 100-foot leach line with a 33-inch diameter by 25-foot deep seepage pit was added to the existing system. The permits have 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 32 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within a mixed agricultural and rural residential area. Beyond the immediate residential neighborhood are orchards and vineyards. 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 25-foot deep 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 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 2125 Page 2