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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 No septic system construction is anticipated. On-Site Septic Permit History The San Joaquin County Environmental Health Department permit files were searched for the Site address. No septic 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 21 septic systems per square mile are located in the immediate vicinity of the Site. The vicinity of the Site is composed of orchards, agricultural land, and rural residences. A feedlot and compost business are adjacent to the north, and the Escalon Livestock Market is adjacent to the west. 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 sumps; one permit indicated leach lines with 36-inch diameter by 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 any 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. No construction is anticipated. LOGE 20-54 Page 2