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• 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. Live Oak reviewed the San Joaquin County Environmental Health Department's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP). Five wells were identified at addresses within approximately 1.25 miles of the subject Site. One of these was located on the subject Site and was tested in 2004; its water sample was found to contain DBCP at a concentration of 0.1 µg/L and nitrate at a concentration of 10.7 mg/L- NO3. The four remaining wells within 1.25 miles had all been tested for DBCP; it was not detected in any of the samples. All four remaining wells had been tested for nitrate; it was detected at concentrations of 5.5 to 11.6 mg/L-NO3. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L. The MCL for DBCP is 0.2 µg/L. On-Site Wells A domestic well and three irrigation wells are located on the Site. Four well permits were identified for the Site at the San Joaquin County Environmental Health Department: • May 1974 permit for pump repair at irrigation well (7066 S. Mobley). • April 1977 permit for pump repair at irrigation well (7066 S. Mobley). • April 1981 permit for irrigation well (6998 S. Bartolomei). • October 2009 permit for pump replacement at domestic well (7066 S. Mobley). These permits are included in Appendix 4 of this report. Water Sample Live Oak collected a water sample from the domestic well on the Site on August 30, 2017. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health Department policy. As required by the laboratory, the sample was collected in a plastic container and two glass vials for nitrate and DBCP analysis, respectively. A trip blank was also utilized. The sample was placed on ice and transported under chain of custody to FGL Environmental, Stockton. At the request of the client, a second water sample was collected on May 23, 2018 in a plastic container. It was placed on ice and transported under chain of custody to FGL Environmental, where it was analyzed for nitrate. Nitrate was detected in the first sample at a concentration of 12.0 mg/L-N (54 mg/L- NO3). DBCP was not detected in the water sample. Nitrate was detected in the second sample at a concentration of 6.8 mg/L-N (30.6 mg/L- NO3). • LOGE 1826 Page 4