Hazardous Substance

CERCLA term defined in 40 CFR 302; a listed
chemical in amount equal to RQ. According to DOT: “A material, including its
mixtures and solutions that: (1) is listed in Appendix A to 172.101, Hazardous
Materials Table, (2) is in a quantity in one package which equals or exceeds
the reportable quantity (RQ) listed in Appendix A to the Hazardous Materials
Table; and (3) when the mixture or solution is in a concentration by weight
corresponding to the RQ of the material.