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Existing and Proposed Septic Tank Usage Existing Septic System No known septic systems are currently located on the Site. Proposed Septic System Mr. Williams plans to build a new septic system for each new residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Two septic permits were identified: • September 1999 permit for destruction of septic system; a small house and storage building were also to be demolished. • October 2001 permit to connect a new residence to an existing septic system with a 1,600-gallon tank. The permit is labeled as having expired. These permits are included in Appendix 4 of this report. Mr. Williams indicated that he tore down an existing house on the Site in 2004 or 2005, shortly after purchasing the property. He stated that the septic system had already been abandoned at this time (personal communication, May 9, 2019). 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 560 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within the community of Morada; the surrounding properties on all sides are primarily residential. 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; one system utilized both seepage pits and a sump. The septic permits can be found in Appendix 4 of this report. LOGE 1919 Page 2