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Mr. G. Fred McCaig -2- 14 February 1985 <br /> Contamination Investigation <br /> Constituents Soil Ground Water <br /> chloroform 2 ppb 0. 2* ppb <br /> methylene chloride 2 ppb 0 . 2 ppb <br /> carbon tetrachloride 4 ppb 0. 4 ppb <br /> bromodichloromethane 2 ppb 0 .2 ppb <br /> *EPA water quality criteria (1980) for potential human <br /> carcinogens at 10-6 cancer risk level . <br /> In considering cumulative effects, cleanup or mitigation must be <br /> performed, even if each chemical is below its individual cleanup <br /> level ,if the following is true: <br /> S (Concentration of Chemical , ppb) > 1 . 0 <br /> (Cleanup level of Chemical , ppb)Z — <br /> L=� <br /> If you have any questions , please call Dan Ward at ( 916) <br /> 324-8891. <br /> ," 'D- <br /> KENNETH D. LANDAU <br /> Senior Engineer <br /> DTW:aj <br /> cc: Mr. Brad Parsons, Department of Health Services, <br /> Toxic Substance Control Division, Sacramento <br /> Mr. Gunter Redlin, Department of Health Services, <br /> Sanitary Engineering Branch, Stockton <br /> Mr. Mike Locke, City Manager, City of Tracy <br /> Mr. Mike Goldstein, Georgia-Pacific Corp. , Montebello <br /> Mr. Ivan Schaffer, Georgia-Pacific Corp. , Tracy <br />