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Existinq and Proposed Septic Tank Usage Existing Septic System One 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 second dwelling unit to be placed on the homesite parcel at some point in the future. A new residence would utilize a new septic system. On-Site Septic Permit History One permit related to septic systems for the Site was identified at the San Joaquin County Environmental Health Department. The permit, dated April 2008, is for a new septic system to serve the residence. The system utilizes a 2,000-gallon septic tank and seven 100-foot leach lines. This permit is 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 six or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of orchards and agricultural land, with scattered rural residences. 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 lines or leach lines with sumps. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the existing and any future residential uses. No construction is planned at this time. Septic system design should be based on the On-Site Wastewater Disposal Standards (2003) or other engineering recommendations. �— LOGE 1134 Page 2