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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 new residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. One septic permit was identified. The permit, dated September 2005, was for the destruction of a redwood septic tank. This permit has been included in Appendix 4. 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 five septic systems per square mile are located in the immediate vicinity of the Site; the mobile home park at Tower Park Marina was only counted once because it is assumed that the homes share a common septic system. The Site is located in an agricultural area in the Sacramento-San Joaquin River Delta. Tower Park Marina with its mobile home park and campground is located less than one half mile southwest of 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, septic systems in the area utilize leach lines or a filter bed. 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 and employee 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 2110 Page 2