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Existing and Proposed Septic Tank Usage Existing Septic System No septic systems are located on the Site. J Proposed Septic System No new construction is planned for the Site at this time. However, County regulations permit a primary residence and a second dwelling unit to be placed on the numbered parcel at some point in the future. Any new residences would utilize new septic systems. On-Site Septic Permit History No septic system permits for the Site were identified at the San Joaquin Countyi2 j Environmental Health Department. 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 five or more septic systems per square mile are present in the immediate vicinity of the Site. l The general area consists of walnut and cherry orchards and open 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, most septic systems in the area utilize leach lines or leach lines with seepage pits. One permit indicated 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 any future residential uses. No construction is planned at this time. Septic system design should be based on the 3,? On-Site Wastewater Disposal Standards (2003) or other engineering recommendations. LOGE 1209 Page 2