178 

§ 68.125 40 CFR Ch. I (7–1–06 Edition) 

(5) Rationale supporting the petitioner’s position; that is, how the substance meets the criteria for addition 

and deletion. A short summary of the 

rationale must be submitted along 

with a more detailed narrative; and 

(6) Supporting data; that is, the petition must include sufficient information to scientifically support the request to modify the list. Such information shall include: 

(i) A list of all support documents; 

(ii) Documentation of literature 

searches conducted, including, but not 

limited to, identification of the database(s) searched, the search strategy, 

dates covered, and printed results; 

(iii) Effects data (animal, human, and 

environmental test data) indicating 

the potential for death, injury, or serious adverse human and environmental 

impacts from acute exposure following 

an accidental release; printed copies of 

the data sources, in English, should be 

provided; and 

(iv) Exposure data or previous accident history data, indicating the potential for serious adverse human 

health or environmental effects from 

an accidental release. These data may 

include, but are not limited to, physical and chemical properties of the substance, such as vapor pressure; modeling results, including data and assumptions used and model documentation; and historical accident data, citing data sources. 

(h) Within 18 months of receipt of a 

petition, the Administrator shall publish in the FEDERAL REGISTER a notice 

either denying the petition or granting 

the petition and proposing a listing. 

§ 68.125 Exemptions. 

Agricultural nutrients. Ammonia used 

as an agricultural nutrient, when held 

by farmers, is exempt from all provisions of this part. 

§ 68.126 Exclusion. 

Flammable Substances Used as Fuel or 

Held for Sale as Fuel at Retail Facilities. 

A flammable substance listed in Tables 

3 and 4 of §68.130 is nevertheless excluded from all provisions of this part 

when the substance is used as a fuel or 

held for sale as a fuel at a retail facility. 

[65 FR 13250, Mar. 13, 2000] 

§ 68.130 List of substances. 

(a) Regulated toxic and flammable 

substances under section 112(r) of the 

Clean Air Act are the substances listed 

in Tables 1, 2, 3, and 4. Threshold quantities for listed toxic and flammable 

substances are specified in the tables. 

(b) The basis for placing toxic and 

flammable substances on the list of 

regulated substances are explained in 

the notes to the list. 

TABLE 1 TO § 68.130—LIST OF REGULATED

TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR ACCIDENTAL RELEASE PREVENTION

[Alphabetical Order—77 Substances] 

Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

Acrolein [2- 

Propenal].

107–02–8 5,000 b 

Acrylonitrile [2- 

Propenenitrile].

107–13–1 20,000 b 

Acrylyl chloride 

[2-Propenoyl 

chloride].

814–68–6 5,000 b 

Allyl alcohol [2- 

Propen-l-ol].

107–18–61 15,000 b 

Allylamine [2- 

Propen-lamine].

107–11–9 10,000 b 

Ammonia (anhydrous).7664–41–7 10,000 a, b 

Ammonia (conc 

20% or greater).

7664–41–7 20,000 a, b 

Arsenous trichloride.7784–34–1 15,000 b 

Arsine ................. 7784–42–1 1,000 b 

Boron trichloride 

[Borane, 

trichloro-].

10294–34–5 5,000 b 

Boron trifluoride 

[Borane, 

trifluoro-].

7637–07–2 5,000 b 

Boron trifluoride 

compound with 

methyl ether 

(1:1) [Boron, 

trifluoro [oxybis 

[metane]]-, T-4-.

353–42–4 15,000 b 

Bromine .............. 7726–95–6 10,000 a, b 

Carbon disulfide 75–15–0 20,000 b 

Chlorine .............. 7782–50–5 2,500 a, b 

Chlorine dioxide 

[Chlorine oxide 

(ClO2)].

10049–04–4 1,000 c 

Chloroform 

[Methane, 

trichloro-].

67–66–3 20,000 b 

Chloromethyl 

ether [Methane, 

oxybis[chloro-].

542–88–1 1,000 b 

Chloromethyl 

methyl ether 

[Methane, 

chloromethoxy- 

].

107–30–2 5,000 b 

Crotonaldehyde 

[2-Butenal].

4170–30–3 20,000 b 

179 

Environmental Protection Agency § 68.130 

TABLE 1 TO § 68.130—LIST OF REGULATED

TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR ACCIDENTAL RELEASE PREVENTION—Continued 

[Alphabetical Order—77 Substances] 

Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

Crotonaldehyde, 

(E)- [2-Butenal, 

(E)-].

123–73–9 20,000 b 

Cyanogen chloride.506–77–4 10,000 c 

Cyclohexylamine 

[Cyclohexanamine].

108–91–8 15,000 b 

Diborane ............. 19287–45–7 2,500 b 

Dimethyldichlorosilane [Silane, 

dichlorodimethyl-].

75–78–5 5,000 b 

1,1- 

Dimethylhydrazine [Hydrazine, 1,1-dimethyl-].

57–14–7 15,000 b 

Epichlorohydrin 

[Oxirane, 

(chloromethyl)-].

106–89–8 20,000 b 

Ethylenediamine 

[1,2- 

Ethanediamine].

107–15–3 20,000 b 

Ethyleneimine 

[Aziridine].

151–56–4 10,000 b 

Ethylene oxide 

[Oxirane].

75–21–8 10,000 a, b 

Fluorine .............. 7782–41–4 1,000 b 

Formaldehyde 

(solution).

50–00–0 15,000 b 

Furan .................. 110–00–9 5,000 b 

Hydrazine ........... 302–01–2 15,000 b 

Hydrochloric acid 

(conc 37% or 

greater).

7647–01–0 15,000 d 

Hydrocyanic acid 74–90–8 2,500 a, b 

Hydrogen chloride (anhydrous) [Hydrochloric acid].

7647–01–0 5,000 a 

Hydrogen fluoride/ 

Hydrofluoric 

acid (conc 50% 

or greater) 

[Hydrofluoric 

acid].

7664–39–3 1,000 a, b 

Hydrogen selenide.7783–07–5 500 b 

Hydrogen sulfide 7783–06–4 10,000 a, b 

Iron, 

pentacarbonyl- 

[Iron carbonyl 

(Fe(CO)5), 

(TB-5-11)-].

13463–40–6 2,500 b 

Isobutyronitrile 

[Propanenitrile, 

2-methyl-].

78–82–0 20,000 b 

Isopropyl 

chloroformate 

[Carbonochloridic acid, 1- 

methylethyl 

ester].

108–23–6 15,000 b 

TABLE 1 TO § 68.130—LIST OF REGULATED

TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR ACCIDENTAL RELEASE PREVENTION—Continued 

[Alphabetical Order—77 Substances] 

Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

Methacrylonitrile 

[2- 

Propenenitrile, 

2-methyl-].

126–98–7 10,000 b 

Methyl chloride 

[Methane, 

chloro-].

74–87–3 10,000 a 

Methyl 

chloroformate 

[Carbonochloridic acid, 

methylester].

79–22–1 5,000 b 

Methyl hydrazine 

[Hydrazine, 

methyl-].

60–34–4 15,000 b 

Methyl isocyanate 

[Methane, 

isocyanato-].

624–83–9 10,000 a, b 

Methyl mercaptan 

[Methanethiol].

74–93–1 10,000 b 

Methyl 

thiocyanate 

[Thiocyanic 

acid, methyl 

ester].

556–64–9 20,000 b 

Methyltrichlorosilane [Silane, 

trichloromethyl- 

].

75–79–6 5,000 b 

Nickel carbonyl ... 13463–39–3 1,000 b 

Nitric acid (conc 

80% or greater).

7697–37–2 15,000 b 

Nitric oxide [Nitrogen oxide 

(NO)].

10102–43–9 10,000 b 

Oleum (Fuming 

Sulfuric acid) 

[Sulfuric acid, 

mixture with 

sulfur trioxide] 1.

8014–95–7 10,000 e 

Peracetic acid 

[Ethaneperoxoic acid].

79–21–0 10,000 b 

Perchloromethylmercaptan 

[Methanesulfenyl chloride, 

trichloro-].

594–42–3 10,000 b 

Phosgene [Carbonic dichloride].

75–44–5 500 a, b 

Phosphine .......... 7803–51–2 5,000 b 

Phosphorus 

oxychloride 

[Phosphoryl 

chloride].

10025–87–3 5,000 b 

Phosphorus trichloride [Phosphorous trichloride].

7719–12–2 15,000 b 

Piperidine ........... 110–89–4 15,000 b 

Propionitrile 

[Propanenitrile].

107–12–0 10,000 b 

180 

§ 68.130 40 CFR Ch. I (7–1–06 Edition) 

TABLE 1 TO § 68.130—LIST OF REGULATED

TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR ACCIDENTAL RELEASE PREVENTION—Continued 

[Alphabetical Order—77 Substances] 

Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

Propyl 

chloroformate 

[Carbonochloridic acid, 

propylester].

109–61–5 15,000 b 

Propyleneimine 

[Aziridine, 2- 

methyl-].

75–55–8 10,000 b 

Propylene oxide 

[Oxirane, methyl-].

75–56–9 10,000 b 

Sulfur dioxide 

(anhydrous).

7446–09–5 5,000 a, b 

Sulfur tetrafluoride [Sulfur 

fluoride (SF4), 

(T-4)-].

7783–60–0 2,500 b 

Sulfur trioxide ..... 7446–11–9 10,000 a, b 

Tetramethyllead 

[Plumbane, 

tetramethyl-].

75–74–1 10,000 b 

Tetranitromethane [Methane, tetranitro-].

509–14–8 10,000 b 

Titanium tetrachloride [Titanium chloride 

(TiCl4) (T-4)-].

7550–45–0 2,500 b 

Toluene 2,4- 

diisocyanate 

[Benzene, 2,4- 

diisocyanato-1- 

methyl-] 1.

584–84–9 10,000 a 

TABLE 1 TO § 68.130—LIST OF REGULATED

TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR ACCIDENTAL RELEASE PREVENTION—Continued 

[Alphabetical Order—77 Substances] 

Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

Toluene 2,6- 

diisocyanate 

[Benzene, 1,3- 

diisocyanato-2- 

methyl-] 1.

91–08–7 10,000 a 

Toluene 

diisocyanate 

(unspecified 

isomer) [Benzene, 1,3- 

diisocyanatomethyl-] 1.

26471–62–5 10,000 a 

Trimethylchlorosilane [Silane, 

chlorotrimethyl- 

].

75–77–4 10,000 b 

Vinyl acetate 

monomer [Acetic acid ethenyl 

ester].

108–05–4 15,000 b 

1The mixture exemption in § 68.115(b)(1) does not apply to the substance. 

NOTE: Basis for Listing: 

a Mandated for listing by Congress. 

b On EHS list, vapor pressure 10 mmHg or greater. 

c Toxic gas. 

d Toxicity of hydrogen chloride, potential to release hydrogen chloride, and history of accidents. 

e Toxicity of sulfur trioxide and sulfuric acid, potential to 

release sulfur trioxide, and history of accidents. 

TABLE 2 TO § 68.130—LIST OF REGULATED TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR

ACCIDENTAL RELEASE PREVENTION

[CAS Number Order—77 Substances] 

CAS No. Chemical name 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

50–00–0 ..................... Formaldehyde (solution) .................................................................................... 15,000 b 

57–14–7 ..................... 1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] ............................................. 15,000 b 

60–34–4 ..................... Methyl hydrazine [Hydrazine, methyl-] ............................................................... 15,000 b 

67–66–3 ..................... Chloroform [Methane, trichloro-] ........................................................................ 20,000 b 

74–87–3 ..................... Methyl chloride [Methane, chloro-] .................................................................... 10,000 a 

74–90–8 ..................... Hydrocyanic acid ................................................................................................ 2,500 a, b 

74–93–1 ..................... Methyl mercaptan [Methanethiol] ....................................................................... 10,000 b 

75–15–0 ..................... Carbon disulfide ................................................................................................. 20,000 b 

75–21–8 ..................... Ethylene oxide [Oxirane] .................................................................................... 10,000 a, b 

75–44–5 ..................... Phosgene [Carbonic dichloride] ......................................................................... 500 a, b 

75–55–8 ..................... Propyleneimine [Aziridine, 2-methyl-] ................................................................ 10,000 b 

75–56–9 ..................... Propylene oxide [Oxirane, methyl-] ................................................................... 10,000 b 

75–74–1 ..................... Tetramethyllead [Plumbane, tetramethyl-] ......................................................... 10,000 b 

75–77–4 ..................... Trimethylchlorosilane [Silane, chlorotrimethyl-] ................................................. 10,000 b 

75–78–5 ..................... Dimethyldichlorosilane [Silane, dichlorodimethyl-] ............................................. 5,000 b 

75–79–6 ..................... Methyltrichlorosilane [Silane, trichloromethyl-] ................................................... 5,000 b 

78–82–0 ..................... Isobutyronitrile [Propanenitrile, 2-methyl-] ......................................................... 20,000 b 

79–21–0 ..................... Peracetic acid [Ethaneperoxoic acid] ................................................................ 10,000 b 

79–22–1 ..................... Methyl chloroformate [Carbonochloridic acid, methylester] ............................... 5,000 b 

91–08–7 ..................... Toluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-]1 ................... 10,000 a 

106–89–8 ................... Epichlorohydrin [Oxirane, (chloromethyl)-] ......................................................... 20,000 b 

107–02–8 ................... Acrolein [2-Propenal] ......................................................................................... 5,000 b 

107–11–9 ................... Allylamine [2-Propen-1-amine] ........................................................................... 10,000 b 

181 

Environmental Protection Agency § 68.130 

TABLE 2 TO § 68.130—LIST OF REGULATED TOXIC SUBSTANCES AND THRESHOLD QUANTITIES FOR

ACCIDENTAL RELEASE PREVENTION—Continued 

[CAS Number Order—77 Substances] 

CAS No. Chemical name 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

107–12–0 ................... Propionitrile [Propanenitrile] ............................................................................... 10,000 b 

107–13–1 ................... Acrylonitrile [2-Propenenitrile] ............................................................................ 20,000 b 

107–15–3 ................... Ethylenediamine [1,2-Ethanediamine] ............................................................... 20,000 b 

107–18–6 ................... Allyl alcohol [2-Propen-1-ol] ............................................................................... 15,000 b 

107–30–2 ................... Chloromethyl methyl ether [Methane, chloromethoxy-] ..................................... 5,000 b 

108–05–4 ................... Vinyl acetate monomer [Acetic acid ethenyl ester] ........................................... 15,000 b

108–23–6 ................... Isopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester] ............... 15,000 b 

108–91–8 ................... Cyclohexylamine [Cyclohexanamine] ................................................................ 15,000 b 

109–61–5 ................... Propyl chloroformate [Carbonochloridic acid, propylester] ................................ 15,000 b 

110–00–9 ................... Furan .................................................................................................................. 5,000 b 

110–89–4 ................... Piperidine ........................................................................................................... 15,000 b 

123–73–9 ................... Crotonaldehyde, (E)- [2-Butenal, (E)-] ............................................................... 20,000 b 

126–98–7 ................... Methacrylonitrile [2-Propenenitrile, 2-methyl-] ................................................... 10,000 b 

151–56–4 ................... Ethyleneimine [Aziridine] .................................................................................... 10,000 b 

302–01–2 ................... Hydrazine ........................................................................................................... 15,000 b 

353–42–4 ................... Boron trifluoride compound with methyl ether (1:1) [Boron, 

trifluoro[oxybis[methane]]-, T-4-.

15,000 b 

506–77–4 ................... Cyanogen chloride ............................................................................................. 10,000 c 

509–14–8 ................... Tetranitromethane [Methane, tetranitro-] ........................................................... 10,000 b 

542–88–1 ................... Chloromethyl ether [Methane, oxybis[chloro-] ................................................... 1,000 b 

556–64–9 ................... Methyl thiocyanate [Thiocyanic acid, methyl ester] ........................................... 20,000 b 

584–84–9 ................... Toluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-]1 ................... 10,000 a 

594–42–3 ................... Perchloromethylmercaptan [Methanesulfenyl chloride, trichloro-] ..................... 10,000 b 

624–83–9 ................... Methyl isocyanate [Methane, isocyanato-] ........................................................ 10,000 a, b 

814–68–6 ................... Acrylyl chloride [2-Propenoyl chloride] ............................................................... 5,000 b 

4170–30–3 ................. Crotonaldehyde [2-Butenal] ............................................................................... 20,000 b 

7446–09–5 ................. Sulfur dioxide (anhydrous) ................................................................................. 5,000 a, b 

7446–11–9 ................. Sulfur trioxide ..................................................................................................... 10,000 a, b 

7550–45–0 ................. Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] .................................... 2,500 b 

7637–07–2 ................. Boron trifluoride [Borane, trifluoro-] .................................................................... 5,000 b 

7647–01–0 ................. Hydrochloric acid (conc 37% or greater) ........................................................... 15,000 d 

7647–01–0 ................. Hydrogen chloride (anhydrous) [Hydrochloric acid] ........................................... 5,000 a 

7664–39–3 ................. Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] 1,000 a, b 

7664–41–7 ................. Ammonia (anhydrous) ........................................................................................ 10,000 a, b 

7664–41–7 ................. Ammonia (conc 20% or greater) ....................................................................... 20,000 a, b 

7697–37–2 ................. Nitric acid (conc 80% or greater) ....................................................................... 15,000 b 

7719–12–2 ................. Phosphorus trichloride [Phosphorous trichloride] .............................................. 15,000 b 

7726–95–6 ................. Bromine .............................................................................................................. 10,000 a, b 

7782–41–4 ................. Fluorine .............................................................................................................. 1,000 b 

7782–50–5 ................. Chlorine .............................................................................................................. 2,500 a, b 

7783–06–4 ................. Hydrogen sulfide ................................................................................................ 10,000 a, b 

7783–07–5 ................. Hydrogen selenide ............................................................................................. 500 b 

7783–60–0 ................. Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] ............................................... 2,500 b 

7784–34–1 ................. Arsenous trichloride ........................................................................................... 15,000 b 

7784–42–1 ................. Arsine ................................................................................................................. 1,000 b 

7803–51–2 ................. Phosphine .......................................................................................................... 5,000 b 

8014–95–7 ................. Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide]1 ....... 10,000 e 

10025–87–3 ............... Phosphorus oxychloride [Phosphoryl chloride] .................................................. 5,000 b 

10049–04–4 ............... Chlorine dioxide [Chlorine oxide (ClO2)] ............................................................ 1,000 c 

10102–43–9 ............... Nitric oxide [Nitrogen oxide (NO)] ...................................................................... 10,000 b 

10294–34–5 ............... Boron trichloride [Borane, trichloro-] .................................................................. 5,000 b 

13463–39–3 ............... Nickel carbonyl ................................................................................................... 1,000 b 

13463–40–6 ............... Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] ............................... 2,500 b 

19287–45–7 ............... Diborane ............................................................................................................. 2,500 b 

26471–62–5 ............... Toluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl1]1.

10,000 a 

1The mixture exemption in § 68.115(b)(1) does not apply to the substance. 

NOTE: Basis for Listing: 

a Mandated for listing by Congress. 

b On EHS list, vapor pressure 10 mmHg or greater. 

c Toxic gas. 

d Toxicity of hydrogen chloride, potential to release hydrogen chloride, and history of accidents. 

e Toxicity of sulfur trioxide and sulfuric acid, potential to release sulfur trioxide, and history of accidents. 

182 

§ 68.130 40 CFR Ch. I (7–1–06 Edition) 

TABLE 3 TO § 68.130—LIST OF REGULATED FLAMMABLE SUBSTANCES 1 AND THRESHOLD QUANTITIES

FOR ACCIDENTAL RELEASE PREVENTION

[Alphabetical Order—63 Substances] 

Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

Acetaldehyde .................................................................................................................. 75–07–0 10,000 g 

Acetylene [Ethyne] ......................................................................................................... 74–86–2 10,000 f 

Bromotrifluorethylene [Ethene, bromotrifluoro-] ............................................................. 598–73–2 10,000 f 

1,3-Butadiene ................................................................................................................. 106–99–0 10,000 f 

Butane ............................................................................................................................ 106–97–8 10,000 f 

1-Butene ......................................................................................................................... 106–98–9 10,000 f 

2-Butene ......................................................................................................................... 107–01–7 10,000 f 

Butene ............................................................................................................................ 25167–67–3 10,000 f 

2-Butene-cis ................................................................................................................... 590–18–1 10,000 f 

2-Butene-trans [2-Butene, (E)] ....................................................................................... 624–64–6 10,000 f 

Carbon oxysulfide [Carbon oxide sulfide (COS)] ........................................................... 463–58–1 10,000 f 

Chlorine monoxide [Chlorine oxide] ............................................................................... 7791–21–1 10,000 f 

2-Chloropropylene [1-Propene, 2-chloro-] ..................................................................... 557–98–2 10,000 g 

1-Chloropropylene [1-Propene, 1-chloro-] ..................................................................... 590–21–6 10,000 g 

Cyanogen [Ethanedinitrile] ............................................................................................. 460–19–5 10,000 f 

Cyclopropane ................................................................................................................. 75–19–4 10,000 f 

Dichlorosilane [Silane, dichloro-] .................................................................................... 4109–96–0 10,000 f 

Difluoroethane [Ethane, 1,1-difluoro-] ............................................................................ 75–37–6 10,000 f 

Dimethylamine [Methanamine, N-methyl-] ..................................................................... 124–40–3 10,000 f 

2,2-Dimethylpropane [Propane, 2,2-dimethyl-] .............................................................. 463–82–1 10,000 f 

Ethane ............................................................................................................................ 74–84–0 10,000 f 

Ethyl acetylene [1-Butyne] ............................................................................................. 107–00–6 10,000 f 

Ethylamine [Ethanamine] ............................................................................................... 75–04–7 10,000 f 

Ethyl chloride [Ethane, chloro-] ...................................................................................... 75–00–3 10,000 f 

Ethylene [Ethene] ........................................................................................................... 74–85–1 10,000 f 

Ethyl ether [Ethane, 1,1′-oxybis-] ................................................................................... 60–29–7 10,000 g 

Ethyl mercaptan [Ethanethiol] ........................................................................................ 75–08–1 10,000 g 

Ethyl nitrite [Nitrous acid, ethyl ester] ............................................................................ 109–95–5 10,000 f 

Hydrogen ........................................................................................................................ 1333–74–0 10,000 f 

Isobutane [Propane, 2-methyl] ....................................................................................... 75–28–5 10,000 f 

Isopentane [Butane, 2-methyl-] ...................................................................................... 78–78–4 10,000 g 

Isoprene [1,3-Butadinene, 2-methyl-] ............................................................................. 78–79–5 10,000 g 

Isopropylamine [2-Propanamine] ................................................................................... 75–31–0 10,000 g 

Isopropyl chloride [Propane, 2-chloro-] .......................................................................... 75–29–6 10,000 g 

Methane ......................................................................................................................... 74–82–8 10,000 f 

Methylamine [Methanamine] .......................................................................................... 74–89–5 10,000 f 

3-Methyl-1-butene .......................................................................................................... 563–45–1 10,000 f 

2-Methyl-1-butene .......................................................................................................... 563–46–2 10,000 g 

Methyl ether [Methane, oxybis-] ..................................................................................... 115–10–6 10,000 f 

Methyl formate [Formic acid, methyl ester] ................................................................... 107–31–3 10,000 g 

2-Methylpropene [1-Propene, 2-methyl-] ....................................................................... 115–11–7 10,000 f 

1,3-Pentadinene ............................................................................................................. 504–60–9 10,000 f 

Pentane .......................................................................................................................... 109–66–0 10,000 g 

1-Pentene ....................................................................................................................... 109–67–1 10,000 g 

2-Pentene, (E)- ............................................................................................................... 646–04–8 10,000 g 

2-Pentene, (Z)- ............................................................................................................... 627–20–3 10,000 g 

Propadiene [1,2-Propadiene] ......................................................................................... 463–49–0 10,000 f 

Propane .......................................................................................................................... 74–98–6 10,000 f 

Propylene [1-Propene] ................................................................................................... 115–07–1 10,000 f 

Propyne [1-Propyne] ...................................................................................................... 74–99–7 10,000 f 

Silane ............................................................................................................................. 7803–62–5 10,000 f 

Tetrafluoroethylene [Ethene, tetrafluoro-] ...................................................................... 116–14–3 10,000 f 

Tetramethylsilane [Silane, tetramethyl-] ......................................................................... 75–76–3 10,000 g 

Trichlorosilane [Silane, trichloro-] ................................................................................... 10025–78–2 10,000 g 

Trifluorochloroethylene [Ethene, chlorotrifluoro-] ........................................................... 79–38–9 10,000 f 

Trimethylamine [Methanamine, N,N-dimethyl-] .............................................................. 75–50–3 10,000 f 

Vinyl acetylene [1-Buten-3-yne] ..................................................................................... 689–97–4 10,000 f 

Vinyl chloride [Ethene, chloro-] ...................................................................................... 75–01–4 10,000 a, f 

Vinyl ethyl ether [Ethene, ethoxy-] ................................................................................. 109–92–2 10,000 g 

Vinyl fluoride [Ethene, fluoro-] ........................................................................................ 75–02–5 10,000 f 

Vinylidene chloride [Ethene, 1,1-dichloro-] .................................................................... 75–35–4 10,000 g

Vinylidene fluoride [Ethene, 1,1-difluoro-] ...................................................................... 75–38–7 10,000 f 

Vinyl methyl ether [Ethene, methoxy-] ........................................................................... 107–25–5 10,000 f 

1A flammable substance when used as a fuel or held for sale as a fuel at a retail facility is excluded from all provisions of this part (see § 68.126). 

NOTE: Basis for Listing: a Mandated for listing by Congress. 

183 

Environmental Protection Agency § 68.130 

fFlammable gas. 

gVolatile flammable liquid. 

TABLE 4 TO § 68.130—LIST OF REGULATED FLAMMABLE SUBSTANCES 1 AND THRESHOLD QUANTITIES

FOR ACCIDENTAL RELEASE PREVENTION

[CAS Number Order—63 Substances] 

CAS No. Chemical name CAS No. 

Threshold 

quantity 

(lbs) 

Basis for 

listing 

60–29–7 ..................... Ethyl ether [Ethane, 1,1′-oxybis-] .......................................... 60–29–7 10,000 g 

74–82–8 ..................... Methane ................................................................................. 74–82–8 10,000 f 

74–84–0 ..................... Ethane ................................................................................... 74–84–0 10,000 f 

74–85–1 ..................... Ethylene [Ethene] .................................................................. 74–85–1 10,000 f

74–86–2 ..................... Acetylene [Ethyne] ................................................................ 74–86–2 10,000 f 

74–89–5 ..................... Methylamine [Methanamine] ................................................. 74–89–5 10,000 f 

74–98–6 ..................... Propane ................................................................................. 74–98–6 10,000 f 

74–99–7 ..................... Propyne [1-Propyne] ............................................................. 74–99–7 10,000 f 

75–00–3 ..................... Ethyl chloride [Ethane, chloro-] ............................................. 75–00–3 10,000 f 

75–01–4 ..................... Vinyl chloride [Ethene, chloro-] ............................................. 75–01–4 10,000 a, f 

75–02–5 ..................... Vinyl fluoride [Ethene, fluoro-] ............................................... 75–02–5 10,000 f 

75–04–7 ..................... Ethylamine [Ethanamine] ...................................................... 75–04–7 10,000 f 

75–07–0 ..................... Acetaldehyde ......................................................................... 75–07–0 10,000 g 

75–08–1 ..................... Ethyl mercaptan [Ethanethiol] ............................................... 75–08–1 10,000 g 

75–19–4 ..................... Cyclopropane ........................................................................ 75–19–4 10,000 f 

75–28–5 ..................... Isobutane [Propane, 2-methyl] .............................................. 75–28–5 10,000 f 

75–29–6 ..................... Isopropyl chloride [Propane, 2-chloro-] ................................. 75–29–6 10,000 g 

75–31–0 ..................... Isopropylamine [2-Propanamine] .......................................... 75–31–0 10,000 g 

75–35–4 ..................... Vinylidene chloride [Ethene, 1,1-dichloro-] ........................... 75–35–4 10,000 g 

75–37–6 ..................... Difluoroethane [Ethane, 1,1-difluoro-] ................................... 75–37–6 10,000 f 

75–38–7 ..................... Vinylidene fluoride [Ethene, 1,1-difluoro-] ............................. 75–38–7 10,000 f 

75–50–3 ..................... Trimethylamine [Methanamine, N, N-dimethyl-] .................... 75–50–3 10,000 f 

75–76–3 ..................... Tetramethylsilane [Silane, tetramethyl-] ................................ 75–76–3 10,000 g 

78–78–4 ..................... Isopentane [Butane, 2-methyl-] ............................................. 78–78–4 10,000 g 

78–79–5 ..................... Isoprene [1,3,-Butadiene, 2-methyl-] ..................................... 78–79–5 10,000 g 

79–38–9 ..................... Trifluorochloroethylene [Ethene, chlorotrifluoro-] .................. 79–38–9 10,000 f 

106–97–8 ................... Butane ................................................................................... 106–97–8 10,000 f 

106–98–9 ................... 1-Butene ................................................................................ 106–98–9 10,000 f 

196–99–0 ................... 1,3-Butadiene ........................................................................ 106–99–0 10,000 f 

107–00–6 ................... Ethyl acetylene [1-Butyne] .................................................... 107–00–6 10,000 f 

107–01–7 ................... 2-Butene ................................................................................ 107–01–7 10,000 f 

107–25–5 ................... Vinyl methyl ether [Ethene, methoxy-] .................................. 107–25–5 10,000 f 

107–31–3 ................... Methyl formate [Formic acid, methyl ester] ........................... 107–31–3 10,000 g 

109–66–0 ................... Pentane ................................................................................. 109–66–0 10,000 g 

109–67–1 ................... 1-Pentene .............................................................................. 109–67–1 10,000 g 

109–92–2 ................... Vinyl ethyl ether [Ethene, ethoxy-] ........................................ 109–92–2 10,000 g 

109–95–5 ................... Ethyl nitrite [Nitrous acid, ethyl ester] ................................... 109–95–5 10,000 f 

115–07–1 ................... Propylene [1-Propene] .......................................................... 115–07–1 10,000 f 

115–10–6 ................... Methyl ether [Methane, oxybis-] ............................................ 115–10–6 10,000 f 

115–11–7 ................... 2-Methylpropene [1-Propene, 2-methyl-] .............................. 115–11–7 10,000 f 

116–14–3 ................... Tetrafluoroethylene [Ethene, tetrafluoro-] ............................. 116–14–3 10,000 f 

124–40–3 ................... Dimethylamine [Methanamine, N-methyl-] ............................ 124–40–3 10,000 f 

460–19–5 ................... Cyanogen [Ethanedinitrile] .................................................... 460–19–5 10,000 f 

463–49–0 ................... Propadiene [1,2-Propadiene] ................................................ 463–49–0 10,000 f 

463–58–1 ................... Carbon oxysulfide [Carbon oxide sulfide (COS)] .................. 463–58–1 10,000 f 

463–82–1 ................... 2,2-Dimethylpropane [Propane, 2,2-dimethyl-] ..................... 463–82–1 10,000 f 

504–60–9 ................... 1,3-Pentadiene ...................................................................... 504–60–9 10,000 f 

557–98–2 ................... 2-Chloropropylene [1-Propene, 2-chloro-] ............................. 557–98–2 10,000 g 

563–45–1 ................... 3-Methyl-1-butene ................................................................. 563–45–1 10,000 f 

563–46–2 ................... 2-Methyl-1-butene ................................................................. 563–46–2 10,000 g 

590–18–1 ................... 2-Butene-cis .......................................................................... 590–18–1 10,000 f 

590–21–6 ................... 1-Chloropropylene [1-Propene, 1-chloro-] ............................. 590–21–6 10,000 g 

598–73–2 ................... Bromotrifluorethylene [Ethene, bromotrifluoro-] .................... 598–73–2 10,000 f 

624–64–6 ................... 2-Butene-trans [2-Butene, (E)] .............................................. 624–64–6 10,000 f 

627–20–3 ................... 2-Pentene, (Z)- ...................................................................... 627–20–3 10,000 g 

646–04–8 ................... 2-Pentene, (E)- ...................................................................... 646–04–8 10,000 g 

689–97–4 ................... Vinyl acetylene [1-Buten-3-yne] ............................................ 689–97–4 10,000 f 

1333–74–0 ................. Hydrogen ............................................................................... 1333–74–0 10,000 f 

4109–96–0 ................. Dichlorosilane [Silane, dichloro-] ........................................... 4109–96–0 10,000 f 

7791–21–1 ................. Chlorine monoxide [Chlorine oxide] ...................................... 7791–21–1 10,000 f 

7803–62–5 ................. Silane ..................................................................................... 7803–62–5 10,000 f 

10025–78–2 ............... Trichlorosilane [Silane,trichloro-] ........................................... 10025–78–2 10,000 g 

25167–67–3 ............... Butene ................................................................................... 25167–67–3 10,000 f 

1A flammable substance when used as a fuel or held for sale as a fuel at a retail facility is excluded from all provisions of this 

part (see § 68.126). 

184 

§ 68.150 40 CFR Ch. I (7–1–06 Edition) 

NOTE: Basis for Listing: a Mandated for listing by Congress. 

fFlammable gas. 

gVolatile flammable liquid. 

[59 FR 4493, Jan. 31, 1994. Redesignated at 61 FR 31717, June 20, 1996, as amended at 62 FR 45132, 

Aug. 25, 1997; 63 FR 645, Jan. 6, 1998; 65 FR 13250, Mar. 13, 2000] 

Subpart G—Risk Management 

Plan 

SOURCE: 61 FR 31726, June 20, 1996, unless 

otherwise noted. 

§ 68.150 Submission. 

(a) The owner or operator shall submit a single RMP that includes the information required by §§68.155 through 

68.185 for all covered processes. The 

RMP shall be submitted in the method 

and format to the central point specified by EPA as of the date of submission. 

(b) The owner or operator shall submit the first RMP no later than the 

latest of the following dates: 

(1) June 21, 1999; 

(2) Three years after the date on 

which a regulated substance is first 

listed under §68.130; or 

(3) The date on which a regulated 

substance is first present above a 

threshold quantity in a process. 

(c) The owner or operator of any stationary source for which an RMP was 

submitted before June 21, 2004, shall revise the RMP to include the information required by §68.160(b)(6) and (14) by 

June 21, 2004 in the manner specified by 

EPA prior to that date. Any such submission shall also include the information required by §68.160(b)(20) (indicating that the submission is a correction to include the information required by §68.160(b)(6) and (14) or an update under §68.190). 

(d) RMPs submitted under this section shall be updated and corrected in 

accordance with §§68.190 and 68.195. 

(e) Notwithstanding the provisions of 

§§68.155 to 68.190, the RMP shall exclude classified information. Subject to 

appropriate procedures to protect such 

information from public disclosure, 

classified data or information excluded 

from the RMP may be made available 

in a classified annex to the RMP for review by Federal and state representatives who have received the appropriate security clearances. 

(f) Procedures for asserting that information submitted in the RMP is entitled to protection as confidential 

business information are set forth in 

§§68.151 and 68.152. 

[61 FR 31726, June 20, 1996, as amended at 64 

FR 979, Jan. 6, 1999; 69 FR 18831, Apr. 9, 2004] 

§ 68.151 Assertion of claims of confidential business information. 

(a) Except as provided in paragraph 

(b) of this section, an owner or operator of a stationary source required to 

report or otherwise provide information under this part may make a claim 

of confidential business information 

for any such information that meets 

the criteria set forth in 40 CFR 2.301. 

(b) Notwithstanding the provisions of 

40 CFR part 2, an owner or operator of 

a stationary source subject to this part 

may not claim as confidential business 

information the following information: 

(1) Registration data required by 

§68.160(b)(1) through (b)(6) and (b)(8), 

(b)(10) through (b)(13) and NAICS code 

and Program level of the process set 

forth in §68.160(b)(7); 

(2) Offsite consequence analysis data 

required by §68.165(b)(4), (b)(9), (b)(10), 

(b)(11), and (b)(12). 

(3) Accident history data required by 

§68.168; 

(4) Prevention program data required 

by §68.170(b), (d), (e)(1), (f) through (k); 

(5) Prevention program data required 

by §68.175(b), (d), (e)(1), (f) through (p); 

and 

(6) Emergency response program data 

required by §68.180. 

(c) Notwithstanding the procedures 

specified in 40 CFR part 2, an owner or 

operator asserting a claim of CBI with 

respect to information contained in its 

RMP, shall submit to EPA at the time 

it submits the RMP the following: 

(1) The information claimed confidential, provided in a format to be 

specified by EPA;