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• The elevation of the Site, according to a United States Geological Survey topographic map, is approximately 70 to 75 feet above mean sea level. The Site is relatively flat (Plate 4). According to the San Joaquin County Community Development Department (www.co.san-joaquin.ca.us), the subject property 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 agricultural enterprises." Existing and ProposedSeptic Tank Usage Existing Septic System According to the Site Plan prepared by NJ Associates (2018; Plate 2), two septic systems exist on the Site, one for the main residence and one shared by the caretaker's residence and the office. Proposed Septic System A new septic system is proposed to serve the new restroom building (Plate 2). On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Two permits were identified: • October 1962 permit for new, temporary, septic system at mobile home. The system utilized an 800-gallon tank and a 60-foot leach line. • January 1982 permit for septic system repair at mobile home. The system utilized a 1,200-gallon tank and two 100-foot leach lines. The permit also notes that the septic system at the main residence was repaired, with a new 1,200- gallon tank and two seepage pits, in July 1982. The permits are included in Appendix 3 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 17 septic systems per square mile are located in the immediate vicinity of the Site. • LOGE 1820 Page 2