SU0008541 SSNL - Laserfiche WebLink

Home Browse Search

Water Sample Live Oak collected a water sample from the domestic well that will serve the new processing building on the Site on May 23, 2011. The sample was to be 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. A trip blank was also utilized. The sample was placed on ice and transported under chain of custody to FGL Environmental, Stockton. Nitrate and DBCP were not detected in the sample. The laboratory analytical results are attached as Appendix 5 of this report. 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 13.5 mg/L-NO3 (3 mg/L-N). Nitrate may be increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or more (Hull, 1984). DBCP is a nematocide 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) 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. Soil Profile and Geologic Information The Site is depicted on the Preliminary geologic map showing Quaternary deposits of the Lodi Quadrangle, California (Marchand and Atwater, 1979). The Site is depicted within a map unit of Holocene alluvium, described as "channel, levee, and floodplain deposits; chiefly silt and clay with fine sand along principal drainageways" (Plate 7). The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of Cosumnes silty clay loam, drained, 0 to 2 percent slopes, and Sailboat silt loam, drained, 0 to 2 percent slopes, (Plate 8) (USDA, 2009). The table below presents some selected properties of these soils: LOGE1120 Page 4