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CHAPTER 4 Identifying Hazardous Materials in Your Jurisdiction Your goal in this chapter is to identify the set of hazmat potentially present within your jurisdic- tion. Effectively, you will inventory (at varying levels) hazmat at each of the facilities and along trans- portation routes within your jurisdiction. This process is referred to as performing a hazard survey. Before starting the hazard survey process, the hazmat that are of concern for this assessment will be specified. Then, these hazmat will be categorized into Incident Release Types based on their associated required response characteristics. This information will be beneficial in helping you frame the layout of your hazard survey. Hazardous Materials Covered To provide manageable boundaries for the materials covered by this assessment process, this Guide limits the scope of materials to those that are transported commercially under the auspices of the U.S.DOT Hazardous Materials Regulations as found in 49 CFR. This scope includes the storage of materials incidental to transportation (including at facilities at both the origin and destination), as well as along any transportation corridors. Henceforth, materials of concern are referenced throughout this Guide in terms of their U.S.DOT hazard classification designation versus the use of a specific material name. Material Categorization--Incident Release Types The U.S.DOT hazard classification scheme (e.g., Class 1, Division 2.1, etc.) categorizes materi- als based primarily on packaging requirements. For the purposes of this Guide and the subse- quent evaluation of emergency response requirements, materials in the U.S.DOT hazard classes and subdivisions are aggregated into the seven Incident Release Type categories defined earlier and listed below. The Incident Release Type categorization scheme focuses on the types of hazards (i.e., fire, explosion, etc.) that a material might pose if a release were to occur. The seven Incident Release Type categories are as follows: Fires; Explosions or BLEVEs; Toxic gas releases; Toxic liquid releases; Corrosives; Radioactive materials releases; and Releases of biologically active materials. By grouping the materials into these hazard categories, performance objectives for response can be established based on the characteristic of each Incident Release Type. Table 10 matches each U.S.DOT Hazard Class to its corresponding Incident Release Type(s). 22

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Identifying Hazardous Materials in Your Jurisdiction 23 Table 10. Material Incident Release Type groupings. Incident Release Types Toxic Liquid Radioactive Corrosives or BLEVEs U.S.DOT HAZARD Biological Explosion Toxic Gas Material CLASSIFICATION Fire Class 1 Explosives X X Division 1.1 Explosives with a mass explosion hazard X X Division 1.2 Explosives with a projection hazard X X Division 1.3 Explosives with predominantly a fire hazard X X Division 1.4 Explosives with no significant blast hazard X X Division 1.5 Very insensitive explosives with a mass X X explosion hazard D ivision 1.6 Extremely insens itive articles X X Class 2 Gases Division 2.1 Flammable gases X X Division 2.2 Nonflammable, nontoxic* gases Division 2.3 Toxic* gases X Class 3 Flammable liquids X X O Class 4 Flammable solids X Division 4.1 Flammable solids X Division 4.2 Spontaneously combustible materials X Division 4.3 Water-reactive substances/Dangerous when X wet materials Class 5 O X Division 5.1 Oxidizing substances O X Division 5.2 Organic peroxides O X Class 6 O X Division 6.1 Toxic* substances O X Division 6.2 Infectious substances O X X Class 7 Radioactive materials O X Class 8 Corrosive substances O X X Class 9 Miscellaneous O Key: * The words "poison" or "poisonous" are synonymous with the word "toxic." X = Primary consequence of concern O = Secondary consequence of concern Note that the mapping of U.S.DOT Hazard Class to Incident Release Types is not a 1:1 rela- tionship. For example, a U.S.DOT Hazard Class 1, Division 1.1 material described as an "Explo- sive with a mass explosion hazard" can present both a Fire and/or Explosion release hazard, and thus Hazard Class 1 materials are found in two different Incident Release Type categories. The fol- lowing summarizes the U.S.DOT Hazard Class to Incident Release Type relationship: Fires (U.S.DOT Classes 1, 3, 4, Division 2.1, and some Class 5, 6, 7, and 8 materials where flam- mability is not the primary hazard);