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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; two permits were <br /> identified: <br /> • October 2015 permit for pump repair at domestic well. <br /> • May 2020 permit for pump repair at domestic well. <br /> These permits have been included in Appendix 4. <br /> Water Sample <br /> The domestic well is not currently operational. Consequently, no water sample was <br /> collected for this investigation. <br /> Soil Profile and Geologic Information <br /> The Site is depicted on the Geologic and geophysical maps of the Stockton 30' x 60' <br /> quadrangle, California (Delattre, et al., 2023) as within a map unit of Holocene fan levee <br /> deposits (Plate 11). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Stomar clay loam (USDA, 2026) (Plate 12). The table <br /> below presents some selected properties of this soil type: <br /> LOGE 2610 Page 4 <br />