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Proposed Septic System A new septic system will be constructed to serve the new house. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. A permit and a sketch were identified: • August 2005 permit for destruction of septic tank. • June 2007 sketch for building permit indicating proposed well and septic locations. These records 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 60 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located on a one-street residential subdivision. Beyond this, the area consists of vineyards, orchard, open agricultural land, and rural residences along the roadways. 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 and seepage pits; two permits indicated leach lines only. 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. Septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 20-41 Page 2