Extremely Hazardous Substance 3 : Any of over 300 highly toxic chemicals on a list compiled by the Environmental Protection Agency, as defined in 40 Code of Federal Regulations (CFR), Part 355, Paragraph 355.20
City of Chandler, Emergency Operations Plan, Glossary, Chandler, Arizona, USA 2007. https://www.chandleraz.gov/Content/EmergencyOpsPla n.pdf, (Emr Mgt/ ND and Other Dzstr - Amer) {970}