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Existing and Proposed Septic Tank Usage Existing Septic System No septic systems are currently located on the Site. Proposed Septic System A new septic system is proposed to serve the new facility (Plate 2). On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. No permits were identified. 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 four square miles 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 three septic systems per square mile are located in the immediate vicinity of the Site. The general area primarily consists of large commercial/industrial facilities and open, grazing land. 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 or leach lines and seepage pits; one permit indicated that leach lines and a sump would be installed. 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 future employees at the facility. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 1849 Page 2