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Existing and Proposed Septic Tank Usage Existing Septic System There is currently one septic system on the Site to serve the existing residence (Plate 2). Proposed Septic System Mr. Quintero plans to install a new septic system for the new residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. One septic permit was identified: • July 1987 permit for the installation of a new residential septic system. The system utilized a 1,600-gallon septic tank, three 75-foot leach lines, and three 33- inch diameter by 25-foot deep seepage pits. This permit is 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 95 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located on the eastern outskirts of Stockton. The surrounding properties are a mixture of residential lots and orchards. A mobile home park is located about one-third of a mile southwest 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 utilize leach lines and seepage pits. 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 existing and future residents of the Site. Septic system design should be based on the San Joaquin County On-Site LOGE 1942 Page 2