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designation "is established to preserve agricultural lands for the continuation of commercial agriculture enterprises." Existing and Proposed Septic Tank Usage Existing Septic System Three septic systems are currently located on the Site (Plate 4). Proposed Septic System If houses are built on the new parcels, new septic systems will be required. On -Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses. Two septic permits were identified: • February 1990 permit for new septic system at mobile home. The system utilized a 1,200 -gallon tank and three 80 -foot leach lines. • November 1975 permit for new residential septic system at southern house. The system utilized a 1,600 -gallon tank and two filter beds. 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 29 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists of orchards and agricultural land, with some rural residences. A food processing facility is located across Frederick Avenue from 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 only; one permit indicated leach lines with sumps, and one indicated a filter bed system. The septic permits can be found in Appendix 4 of this report. LOGE 2233 Page 2