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Ground Water Information Depth and Gradient Live Oak reviewed ground-water elevation information available from the San Joaquin County Flood Control and Water Conservation District to determine the ground-water levels near the Site. Data from spring and fall of 2016 were the most recent available from this source. According to an analysis of these maps (Plates 4 and 5), ground- water elevation is approximately 20 to 30 feet above mean sea level. Ground water appears to flow to the northwest in the area; due to the location of the Site close to the edge of the map, the ground-water gradient could not be calculated. Given that the ground elevation of the Site is approximately 58 feet above mean sea level, the depth to water below the Site is estimated to be approximately 28 to 38 feet. Potential Ground Water Contamination Issues The Soil Suitability Study is not intended to be an investigation into ground-water contamination sources, and no such investigation was conducted. Many sources can contribute to ground-water contamination, including leaking underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities and the use of septic systems in the area are known ground-water contamination sources with the potential to impact the Site. Two common ground-water contaminants in San Joaquin County are nitrate and dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County Environmental Health Department's maps of Nitrate— Land Use Data and DBCP— Land Use Data dated February 20, 2019 (Plates 6 and 7). According to the nitrate map, three wells within a one-mile radius of the subject Site have been tested for nitrate. Nitrate was detected in one well at a concentration between 0.1 to 5.0 mg/L-N, in one at a concentration from 5.0 to 10.0 mg/L-N, and in one at a concentration over 10 mg/L-N. Two wells within a one-mile radius of the Site were tested for DBCP; no DBCP was detected in either well. Mr. McIntosh indicated that the Site was a chicken ranch in the past, but he stated that the chickens were gone from the Site when he purchased it in 2003. He stated that the two buildings had concrete floors, and the manure was collected in concrete tanks. Mr. McIntosh has been breaking up the concrete and hauling it away (personal communication, June 15, 2020). On-Site Wells A domestic well is located on the Site. Two well records were identified for the Site from among the files of the San Joaquin County Environmental Health Department: LOGE 20-25 Page 3