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' TABLE 3 <br /> ' METALS CONCENTRATIONS GUIDELINES <br /> Guideline Chromimt Co er Lead. Nickel Zinc <br /> TTLC (mg/kg) 2,500 2,500 1,000 2,000 5,000 <br /> STLC(mg/kg) 560 25 5 20 250 <br /> MCL(mg/1) 005 1.3 0.015 0.1 <br /> ' PRG IndusbrW Soil 450 76,000 750 41,000 100,000 <br /> (mg kg) <br /> PRG Residential Soil 210 2,900 400 150 23,000 <br /> ' (mg/k <br /> Advanced GeoEnvuonmental,Inc. <br />