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Existing and Proposed Septic Tank Usage Existing Septic System One septic system is currently located on the Site to serve the existing house. Proposed Septic System No new development is planned for the Site. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Two septic permits were identified: • November 1969 permit for a new septic system at mobile home. According to the permit, a 1,200-gallon septic tank and two 75-foot leach lines were installed. • September 1984 permit for addition of one 100-foot leach line to existing residential septic system. The permits 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 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 approximately three septic systems per square mile are located in the vicinity of the Site. The area surrounding the Site consists of agricultural land and orchards with occasional rural residences and agricultural buildings. The San Joaquin River lies to the immediate east 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, most septic systems in the area have leach lines only; one system has 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 current residents of the Site; no additional development is anticipated. Any future septic system design should be LOGE 20-17 Page 2