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mg/L-N; the final well contained nitrate at a concentration between 5.0 and 10.0 mg/L-N. According to the DBCP map, seven wells within a one -mile radius of the Site have been tested for DBCP. No DBCP was detected in any of the wells. On -Site Wells Two wells are located on the Site, a domestic well near the house and a second well near the northeast corner (Plate 2). One well permit was identified for the Site from among the files of the San Joaquin County Environmental Health Department. The permit, dated October 2001, was for a new domestic well with a depth of approximately 275 feet and a grout seal at 200 feet; the permit has been attached in Appendix 4 of this report. Water Sample Live Oak collected a water sample from the domestic well on the Site on September 10, 2021. 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. Trip blanks were also utilized. The sample was placed on ice and transported under chain of custody to FGL Environmental, Stockton. Nitrate was detected in the sample at a concentration of 1.2 mg/L-N. The laboratory analytical results are attached as Appendix 5 of this report. The DBCP results have not yet been received from the laboratory; they will be forwarded as soon as they are available. 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 then 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 and certain others can also develop methemoglobinemia. Symptoms include a bluish LOGE 2147 Page 4