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On-Site Wells Three domestic wells and an irrigation well are currently located on the Site. Two well permits were identified for the Site from among the files of the San Joaquin County Environmental Health Department: • June 1995 permit for a new domestic well. The total depth of the well was 300 feet, and the grout seal was 100 feet deep (15757). • September 2015 permit for a new domestic well. The total depth of the well was 320 feet, and the grout seal was 100 feet deep (15300). These permits can be found in Appendix 4 of this report. Water Sample Live Oak collected water sample from the three domestic wells on the Site on September 10, 2019. The samples were analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health Department policy. As required by the laboratory, each sample was collected in a plastic container and two glass vials for nitrate and DBCP analysis, respectively. Trip blanks were also utilized. The samples were placed on ice and transported under chain of custody to FGL Environmental, Stockton. Nitrate was detected in the sample from the western well at a concentration of 1.9 mg/L- N, in the sample from the center well at a concentration of 0.8 mg/L-N, and in the sample from the eastern well at a concentration of 0.8 mg/L-N. DBCP was not detected in any of the samples. The laboratory analytical results are attached as Appendix 5 of this report. Nitrate is commonly detected in shallow ground water aquifers of the Central Valley. Application of fertilizers, livestock waste, and untreated septic tank waste can all contribute to nitrate in ground water. Nitrate is mobile and tends to accumulate in shallow ground water zones. Based on work in the Sacramento Valley from the early 1900s, it is estimated that under "natural" conditions, ground water contains nitrate at concentrations no more than about 3 mg/L-N. Nitrate may be increasing in areas with concentrations of 5.5 mg/L-N or more (Hull, 1984). The US EPA has set the Maximum Contaminant Level (MCL) for nitrate at 10 mg/L-N. Although nitrate is a naturally-occurring compound necessary for plant growth, it can cause health problems when present at high levels in drinking water. The most common health effect of nitrates in water is methemoglobinemia, or blue baby syndrome, which results in reduced oxygen supply to vital tissues. Pregnant women LOGE 1943 Page 5