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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 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 No wells are located on the Site. The San Joaquin County Environmental Health Department well permit files were searched for the Site address; no permits were identified. Water Sample Because no wells are present, no water sample was collected as part of this investigation. Soil Profile and Geologic Information The Site is depicted on the Preliminary geologic map of the Lodi 30' x 60' quadrangle, California (Dawson, 2009) as within a map unit of the Modesto formation upper member, consisting of undivided alluvium (Plate 11). The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of Archerdale clay loam and Cogna loam (USDA, 2025) (Plate 12). The table below presents some selected properties of these soil types: LOGE 2544 Page 4