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Existing and Proposed Septic Tank Usage Existing Septic System According to the tentative parcel map (Quartaroli & Associates, 2013), one known septic system exists on the Site to serve the residence. - - Proposed Septic System No new construction is planned for the Site at this time. However, County regulations permit a new residence to be placed on each numbered parcel at some point in the future. Any new residence would utilize a new septic system. On-Site Septic Permit History Two Ormits related to septic systems for the Site were identified at the San Joaquin County Environmental Health Department. • June 1970 permit for new septic system at mobile home. The system utilizes a 1,200-gallon septic tank and two 90-foot leach lines. A well is depicted to the west of the mobile home. • October 2005 permit for new septic system at residence. The system utilizes a 1,600-gallon septic system and three 100-foot leach lines. The permits are included in Appendix 4. Existing Septic Tank Usage in the Vicinity To estimate the existing 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 GoogleEarthTM was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that nine or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of mixed agricultural and industrial land. The Tracy Defense Depot is adjacent to the west. Septic Permit History in the Vicinity Based on a recent review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, the septic systems in the area utilize leach lues or leach lines with filter beds. The septic permits can be found in Appendix 4 of this report. LOGE 1304 Page 2