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• March 1997 permit for repair to existing system at "front main shop." The permit indicated that three 5-foot diameter by 25-foot deep seepage pits were added to the existing commercial system (1754). • September 1998 permit for septic tank destruction. The permit notes that an existing house/office were demolished (1748). • November 1998 permit for new septic system at shop building. The system utilized a 2,000-gallon septic tank and five, five-foot diameter by 25-foot deep seepage pits (1748). These 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 220 septic systems per square mile are located in the immediate vicinity of the Site. Areas that are part of the City of Stockton were not included in the count as it is presumed that those areas are connected to municipal sewer services. The Site is located in a mixed use region; residential subdivisions, businesses, industrial facilities, and agricultural properties are all present in the area surrounding 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 with 25-foot deep seepage pits; one permit indicated the use of 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 employees and customers 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 20-24 Page 3