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IMTIAL RELEASE DDJC Tracy <br /> TABLE 7.Contaminant Concentrations in On-Site Surface Soil <br /> Number of <br /> Concentration(ppm) Aetections/ Number of Detections <br /> Number of Greater than the Comparison Value • <br /> Contaminant Minimum Maximum Samples Comparison Value (ppm) <br /> Arsenic 1.52 89.3 42/42 42/42 0.5 CREG <br /> Beryllium 0.245 0.804 30/42 30/42 0.2 CREG <br /> Chromium 21.3 60.3 42/42 0 4,000 RMEG-adult <br /> Lead 9.92 95.6 30/42 0 no value <br /> Vanadium 23.7 55.9 42/42 0 2,000 RMEG-adult <br /> DDD 0.000674 1.22 35/41 0 3 CREG <br /> DDE 0.00505 4.2 38/41 3/41 2 CREG <br /> DDT 0.00284 4.51 38/41 3/41 2 CREG <br /> Chlordane 0.00335 0.689 36/41 2/41 0.5 CREG <br /> Dieldrin 0.000726 0.738 38/41 15/41 0.04 CREG <br /> Source: Montgomery Watson, 1996b. <br /> Key: CREG=Cancer Risk Evaluation Guide for 1 x 10"excess cancer risk; RMEG=Reference Dose Media Evaluation Guide <br /> 38 <br />