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Existing and Proposed Septic Tank Usage Existing Septic System Two septic systems are currently located on the Site (Plate 2). Proposed Septic System Mr. Foroutan may construct a new septic system to serve a new house on the southern parcel at some point in the future. He may also construct a new septic system for one of the existing residences on the southern parcel that currently share a system. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Three permits were identified: • May 2004 permit for new septic system at residence (8505 W. Stockton). The system utilized a 1,600-gallon septic tank and four 100-foot leach lines. • March 2007 permit for replacement filter bed at residential septic system (8505 W. Stockton St). The permit notes that "existing leach field is being abandoned and relocated to allow for 2nd unit dwelling." The new system utilized a 30 by 50- foot filter bed. • March 2007 permit for new septic system at residence. The system utilized a 24 by 50-foot filter bed (8500 Alice). These permits have been attached 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 193 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within the town of Thornton. The surrounding properties are residential, commercial, and municipal. Agricultural properties surround the town. 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; two permits indicated the use of shallow sumps, and one indicated a filter bed system. The septic permits can be found in Appendix 4 of this report. LOGE 1926a Page 2