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• 8.0 IDENTIFIED CONTAMINATION SOURCES <br /> The following sources of past, current, on-site, and off-site contamination have <br /> been identified as a result of this investigation: <br /> Identified Contamination Source Evaluation <br /> 1. The Site has been used for As with any agricultural property, <br /> agriculture since 1940 or earlier agricultural chemical residues may <br /> and for orchard and vineyard since be present in Site soils. The San <br /> 1975 or earlier. Agricultural Joaquin County Agricultural <br /> chemicals continue to be applied to Commissioner's office regulates <br /> the Site, as indicated in Appendix chemical application. <br /> 4. (Current and past on-site) <br /> 2. Five wells that had been tested for It appears that the Site is located in <br /> nitrate were identified at addresses an area where nitrate levels exceed <br /> within approximately one mile of the MCL in some wells. In the <br /> the subject Site. Nitrate was future, when the Site is used for <br /> detected in all of the wells at residential purposes, it is <br /> concentrations of 20 to 135 mg/L- recommended that the domestic <br /> NO3. The Maximum Contaminant well be tested for nitrate and DBCP. <br /> • Level (MCL) set by the US EPA for No wells are located on the Site at <br /> nitrate as NO3 is 45 mg/L. (Current this time. <br /> and past off-site) <br /> • <br /> LOGE 1626 7 <br />