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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 will be constructed for the proposed new home. 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 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 13 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located in a primarily agricultural area. Most nearby properties consist of orchards, with occasional rural residences. 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 seepage pits or 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 future residents of the Site. The new septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 2544 Page 2