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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 color of the skin, as well as headache, dizziness, weakness, and difficulty breathing. Ingestion of high levels of nitrates over time can also lead to gastric problems. DBCP is a nematicide and soil fumigant for vegetables and grapes. It is known to cause male reproductive effects and is classified as a probable human carcinogen. Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set the MCL at 0.2 parts per billion (ppb, equivalent to µg/L) because it believes that given present technology and resources, this is the lowest level to which water systems can reasonably be required to remove this contaminant should it occur in drinking water. The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. On-Site Wells Two irrigation wells are located on the Site. The San Joaquin County Environmental Health Department well permit files were searched for the Site address. Three permits were identified: • December 1979 permit for pump repair at irrigation well (southeast corner of Site). • November 2020 permit for new irrigation well at northeast corner of Site. The well was drilled to 415 feet, with a screen from 325 to 385 feet. • March 2022 permit for pump installation at irrigation well at northeast corner of Site. Standing water was noted at 80 feet deep; the pump was set at 260 feet deep. These permits have been included in Appendix 4 of this report. Water Sample The orchard on the Site was recently removed. As a result, no irrigation activities are taking place at this time. No water sample was collected. Soil Profile and Geologic Information The Site is depicted on the Geologic map of the San Francisco-San Jose Quadrangle, California (Wagner et al., 1991) as within a map unit of the Modesto formation (Plate 11). The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of Delhi loamy sand, Manteca fine sandy loam, and Veritas LOGE 2307 Page 4