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Existing and Proposed Septic Tank Usage Existing Septic System No septic systems are currently located on the Site (Plate 2). Proposed Septic System Mr. Decker and Ms. Nickell plan to construct a new septic system for the new house. On -Site Septic Permit History The San Joaquin County Environmental Health Department permit files were searched for the Site address. Two septic permits were identified: • June 1971 permit for new Jet aeration package plant septic system at residence. The system included a 1,200 -gallon septic tank and an 80 -foot leach line. • July 2018 permit for destruction of septic tank. These permits refer to a former house removed from the Site in 2018; they 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 78 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located in a residential neighborhood consisting of Harvest and Cooper Roads. Outside of the neighborhood, most of the surrounding properties are vineyards. A few commercial properties and an apartment complex are to the immediate west, and Houston School is approximately 800 feet to the south. 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, septic systems in the area typically utilize leach lines with 25 -foot deep seepage pits; one permit indicated leach lines with sumps, and one indicated a 10 -foot deep leach line. The septic permits can be found in Appendix 4 of this report. LOGE 2145 Page 2