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• HARGIS+ASSOCIATES, INCS <br /> 4.0 CONCLUSIONS <br /> Evaluation of geologic and hydrogeologic data obtained in the vicinity of <br /> the MCTC facility in Stockton, California indicates the following: <br /> 1. Groundwater underlying the MCTC facility in the shallow zone contains <br /> total dissolved chromium. Twenty five of 29 shallow zone monitor wells <br /> are dry (Figure 7) . <br /> 2. Groundwater underlying and south of the MCTC facility in the 100-foot sand <br /> contains total dissolved chromium. The southern extent of 100-foot sand <br /> groundwater containing concentrations of total dissolved chromium greater <br /> than 0.05 mg/l has been determined (Figure 8) . The eastern extent of 100- <br /> foot sand groundwater containing concentrations of total dissolved <br /> chromium greater than 0.05 mg/l has not been determined. <br /> 3. Groundwater underlying and south of the MCTC facility in the intermediate <br /> zone from approximately 120 to 200 feet bls contains total dissolved <br /> chromium. The downgradient extent of groundwater containing <br /> concentrations of total dissolved chromium greater than 0.05 mg/l <br /> southeast of the intersection of Horner Avenue and Coolidge Avenue has not <br /> been determined. The extent of groundwater containing concentrations of <br /> total dissolved chromium greater than 0.05 mg/l east of the north yard has <br /> been determined (Figure 8) . <br /> 4. Groundwater underlying the MCTC facility in the deep zone below <br /> approximately 200 feet bls does not appear to contain concentrations of <br /> total dissolved chromium greater than 0.01 mg/l . The vertical extent of <br /> groundwater containing concentrations of total dissolved chromium greater <br /> than 0.05 mg/l has been determined (Figure 8) . <br /> 5. Total dissolved chromium in groundwater is apparently migrating eastward <br /> in response to the current groundwater gradient. <br /> 71 <br /> 15 March 15I5,, 1991991 <br />