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The EPA and some state environmental protection agencies in the Northeast are engaged in efforts to quantify Cr ( VI ) in soils , set clean-up standards for Cr-contaminated sites , and devise remediation strategies that will protect human health , ecosystem function , and groundwater quality in the urban areas where these high-Cr soils are found . While the final standards have removed language in the communication of hazards provisions to make them more consistent with OSHA 's existing Hazard Communication Standard , the employers obligation to mark regulated areas ( where regulated areas are required ) , to label Cr ( VI ) contaminated clothing and wastes , and to train on the hazards of Cr ( VI ) have not changed . OSHA is also adding a provision that allows the use of compressed air to remove Cr ( VI ) when no alternative method is feasible . A knowledge of these soil chemical transformations could be used effectively to predict the mobility of Cr in soil-water systems , and to remediate Cr ( VI ) - enriched soils via reduction processes that minimize the chances of re-oxidation of the newly-reduced Cr ( III ) .