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According to the San Joaquin County District Viewer (sjmap.org), the Site is zoned AG- 40, General Agriculture with a minimum parcel size of 40 acres. This zoning designation "is established to preserve agricultural lands for the continuation of commercial agriculture enterprises" (San Joaquin County Community Development Department. Existing and Proposed Septic Tank Usage Existing Septic System Two septic systems are currently located on the Site. Proposed Septic System No new septic systems are proposed. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses. Four permits were identified: • March 1969 permit for addition to existing residential septic system. A 45-foot leach line and a sump were added to the system (3592). • February 1988 permit for repair to existing residential system. A 40-foot leach line and a 2- by 10- by 10-foot deep sump were added to the system (3592). • April 2017 permit for addition to existing septic system at residence. The permit indicates a 1,600-gallon septic tank and two 50-foot leach lines were installed (3592). • December 2018 permit for replacement septic system at residence. A 1,200- gallon septic tank and four 75-foot leach lines were installed (3434). These permits 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 23 septic systems per square mile are located in the immediate vicinity of the Site. The Site is surrounded by vineyards with rural residences. LOGE 2151 Page 2