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concentrations of 5.5 mg/L-N or more (Hull, 1984). The US EPA has set the Maximum <br /> Contaminant Level (MCL) for nitrate at 10 mg/L-N. <br /> Although nitrate is a naturally occurring compound necessary for plant growth, it can <br /> cause health problems when present at high levels in drinking water. The most <br /> common health effect of nitrate in water is methemoglobinemia, or blue baby syndrome, <br /> which results in reduced oxygen supply to vital tissues. Pregnant women and certain <br /> others can also develop methemoglobinemia. Symptoms include a bluish color of the <br /> skin, as well as headache, dizziness, weakness, and difficulty breathing. Ingestion of <br /> high levels of nitrate over time can also lead to gastric problems. <br /> DBCP is a nematicide and soil fumigant for vegetables and grapes. It is known to <br /> cause male reproductive effects and is classified as a probable human carcinogen. <br /> Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set <br /> the MCL at 0.2 parts per billion (ppb, equivalent to µg/L) because it believes that given <br /> present technology and resources, this is the lowest level to which water systems can <br /> reasonably be required to remove this contaminant should it occur in drinking water. <br /> The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. <br /> On-Site Wells <br /> A domestic well is located on the Site. The San Joaquin County Environmental Health <br /> Department well permit files were searched for the Site address; three permits were <br /> identified: <br /> • August 1992 permit for pump repair at domestic well. <br /> • February 1993 permit for new domestic well and pump installation. The well had <br /> an approximate depth of 250 feet, with a grout seal depth of 200 feet. The permit <br /> notes that the parcel was split from a larger property and that the previously-used <br /> well remains on the adjacent parcel. <br /> • February 2005 permit for pump replacement at domestic well. <br /> These permits have been included in Appendix 4. <br /> Water Sample <br /> Live Oak collected a water sample from the domestic well on the Site on January 29, <br /> 2026. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San <br /> Joaquin County Environmental Health Department policy. <br /> LOGE 2605 Page 4 <br />