The Hazard Characteristic Code (HCC) designation for Environmental Hazard. Hazard Group & Comments: Materials, not meeting the definition of any other HCC, which contain an Extremely Hazardous Substance listed in 40 CFR, Part 355, Appendix A or B, or a CERCLA Hazardous Substance listed in 40 CFR, Part 302.4, or a Toxic Chemical listed in 40 CFR, Part 372.65. In deciding whether or not a product falls into this category, determine if the concentration of a chemical exceeds the established de minimis limits which compare to the requirement for reporting the existence of the chemical under 29 CFR 1910.1200 section (g)(2)(i)(C)(1)