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• December 1994 permit for addition to existing septic system at mobile home. Three 60-inch diameter by 25-foot deep seepage pits were added to the existing system. (This system appears to be on the adjacent parcel to the south.) • July 1996 permit for repair to existing septic system at mobile home. Two pits were destroyed, and two new 36-inch diameter by 25-foot deep pits were drilled to maintain correct setbacks from a new well. (This system appears to be on the adjacent parcel to the south.) • May 2018 permit for destruction of septic tank. No sketch was attached. 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 180 septic systems per square mile are located in the immediate vicinity of the Site. The majority of the systems are concentrated to the north, in the greater Tracy area. The Site is located in an area with small residential lots to the north. Commercial buildings are present to the immediate south, east, and west, followed by agricultural land. A gravel pit lies to the southwest. 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, filter beds, or 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 existing and future employees and visitors of the Site. Any future septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 20-60 Page 3