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- iii - (3) CAA Section 112(r)List of Substances for Accidental Release Prevention Under the accident prevention provisions of section 112(r) of the CAA,EPA developed a list of 77 toxic substances and 63 flammable substances. Threshold quantities (TQs)were established for these substances. The list and TQs identify processes subject to accident prevention regulations. The Est of substances and TQs and the requirements for risk management programs for accidental release prevention are found in 40 CFR part 68. This consolidated list includes both the common name for each listed chemical under section 112(r) and the chemical name, if different from the common name, as separate listings. The CAA section 112(r) list includes several substances in solution that are covered only in concentrations above a specified level. These substances include ammonia (concentration 20% or greater)(CAS number 7664-41-7); hydrochloric acid(37% or greater)(7647-01-0); hydrogen fluoride/hydrofluoric acid (50% or greater)(7664-39-3); and nitric acid (80% or greater) (7697-37-2). Hydrogen chloride (anhydrous) and ammonia (anhydrous) are listed, in addition to the solutions of these substances,with different TQs. Only the anhydrous form of sulfur dioxide (7446-09-5) is covered. These substances are presented on the consolidated list with the concentration limit or specified form (e.g., anhydrous), as they are listed under CAA section 112(r). Flammable fuels used as a fuel or held for sale as a fuel at a retail facility are not subject to the rule. TQ. The CAA section 112(r) TQ column in the consolidated list shows the TQs (in pounds) for chemicals listed for accidental release prevention. The TQ applies to the quantity of substance in a process,not at the facility as a whole. (4) EPCRA Section 313 Toxic Chemicals Emissions, transfers, and waste management data for chemicals listed under section 313 must be reported annually as part of the community right-to-know provisions of EPCRA(40 CFR part 372). Section 313. The notation "313" in the column for section 313 indicates that the chemical is subject to reporting under section 313 and section 6607 of the Pollution Prevention Act under the name listed. In cases where a chemical is listed under section 313 with a second name in parentheses or brackets,the second name is included on this consolidated list with an"V in the section 313 column. An"X' in this column also may indicate that the same chemical with the same CAS number appears on another list with a different chemical name. Since the last updating of the list in November 1998,. a number of reporting thresholds have changed. These include reporting thresholds for 1.8 chemicals that meet the EPCRA section 313 criteria for persistence and bioaccumulation, as well as lead and lead compounds (except lead contained in stainless steel, brass, and bronze alloys). Chemicals that have had reporting thresholds changed are marked with a"^' symbol on the list. The revised thresholds are listed at the end of this section. Diisocyanates, Dioxins andDioxin-like Compounds, andPACs. In the November 30, 1994, expansion of the section 31.3 list, 20 speck chemicals were added as members of the diisocyanate category, and 19 specific chemicals were added as members of the polycyclic aromatic compounds (PAC)category. In October 1999, EPA added a category of dioxin and dioxin-like compounds that includes 17 specific chemicals. These chemicals are included in the CAS order listing on this consolidated list. The symbol "#" following the "313" notation in the section 313 column identifies diisocyanates, the symbol "!" identifies the dioxin and dioxin-like compounds, and the symbol "+"