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HARGIS+ASSOCIATES, INC.• <br /> Total dissolved chromium was not detected in groundwater samples collected <br /> from the other domestic and irrigation wells (Table 3; Figure 8) . <br /> In accordance with requests from the Regional Quality Control Board and the <br /> CDHS, chemical concentration hydrographs of total dissolved chromium for all <br /> monitor wells at the MCTC facility and other wells in the vicinity have been <br /> prepared (Appendix E) . <br /> 2.2.2 Cooper and Arsenic <br /> A groundwater sample collected from monitor well MW-212 was analyzed for <br /> copper and arsenic. The concentrations of copper and arsenic detected in the <br /> groundwater sample collected from monitor well MW-212 were 0.004 and 0.004 mg/l , <br /> respectively (Appendix A) . The U.S. Environmental Protection Agency (EPA) <br /> proposed Maximum Contaminant Level (MCL) for copper in drinking water is 1.3 mg/l <br /> (Marshack, 1990) . The EPA MCL for arsenic in drinking water is 0.050 mg/l . <br /> Concentrations of arsenic in groundwater samples collected from wells in San <br /> Joaquin County and Sacramento Valley by the U.S. Geological Survey ranged from <br /> not detected to 0.042 mg/l (Sorenson, 1981; Hull , 1984) . These data indicate <br /> that the arsenic detected in groundwater samples is probably a naturally <br /> occurring constituent in the groundwater. <br /> 100.514LF <br /> 11 March 15, 1991 <br />