40 CFR Appendix II to Part 258: Appendix II to Part 258—List of Hazardous Inorganic and Organic Constituents

Common name 1 CAS RN 2 Chemical abstracts service index name 3

Acenaphthene 83-32-9 Acenaphthylene, 1,2-dihydro-

Acenaphthylene 208-96-8 Acenaphthylene

Acetone 67-64-1 2-Propanone

Acetonitrile; Methyl cyanide 75-05-8 Acetonitrile

Acetophenone 98-86-2 Ethanone, 1-phenyl-

2-Acetylaminofluorene; 2-AAF 53-96-3 Acetamide, N-9H-fluoren-2-yl-

Acrolein 107-02-8 2-Propenal

Acrylonitrile 107-13-1 2-Propenenitrile

Aldrin 309-00-2 1,4:5,8-Dimethanonaphthalene, 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-(1,4,4a,5,8,8a)-

Allyl chloride 107-05-1 1-Propene, 3-chloro-

4-Aminobiphenyl 92-67-1 [1,1′-Biphenyl]-4-amine

Anthracene 120-12-7 Anthracene

Antimony (Total) Antimony

Arsenic (Total) Arsenic

Barium (Total) Barium

Benzene 71-43-2 Benzene

Benzo[a]anthracene; Benzanthracene 56-55-3 Benz[a]anthracene

Benzo[b]fluoranthene 205-99-2 Benz[e]acephenanthrylene

Benzo[k]fluoranthene 207-08-9 Benzo[k]fluoranthene

Benzo[ghi]perylene 191-24-2 Benzo[ghi]perylene

Benzo[a]pyrene 50-32-8 Benzo[a]pyrene

Benzyl alcohol 100-51-6 Benzenemethanol

Beryllium (Total) Beryllium

alpha-BHC 319-84-6 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2α,3β,4α,5β,6β)-

beta-BHC 319-85-7 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2β,3α,4β,5α,6β)-

delta-BHC 319-86-8 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2α,3α,4β,5α,6β)-

gamma-BHC; Lindane 58-89-9 Cyclohexane, 1,2,3,4,5,6- hexachloro-,(1α,2α, 3β, 4α,5α,6β)-

Bis(2-chloroethoxy)methane 111-91-1 Ethane, 1,1′-[methylenebis (oxy)]bis [2-chloro-

Bis(2-chloroethyl)ether; Dichloroethyl ether 111-44-4 Ethane, 1,1′-oxybis[2-chloro-

Bis(2-chloro-1-methylethyl) ether; 2,2′-Dichlorodiisopropyl ether; DCIP, See footnote 4 108-60-1 Propane, 2,2′-oxybis[1-chloro-

Bis(2-ethylhexyl) phthalate 117-81-7 1,2-Benzenedicarboxylic acid, bis(2-ethylhexyl)ester

Bromochloromethane; Chlorobromethane 74-97-5 Methane, bromochloro-

Bromodichloromethane; Dibromochloromethane 75-27-4 Methane, bromodichloro-

Bromoform; Tribromomethane 75-25-2 Methane, tribromo-

4-Bromophenyl phenyl ether 101-55-3 Benzene, 1-bromo-4-phenoxy-

Butyl benzyl phthalate; Benzyl butyl phthalate 85-68-7 1,2-Benzenedicarboxylic acid, butyl phenylmethyl ester

Cadmium (Total) Cadmium

Carbon disulfide 75-15-0 Carbon disulfide

Carbon tetrachloride 56-23-5 Methane, tetrachloro-

Chlordane See footnote 5 4,7-Methano-1H-indene, 1,2,4,5,6,7,8,8-octachloro-2,3,3a,4,7,7a-hexahydro-

p-Chloroaniline 106-47-8 Benzenamine, 4-chloro-

Chlorobenzene 108-90-7 Benzene, chloro-

Chlorobenzilate 510-15-6 Benzeneacetic acid, 4-chloro- -(4-chlorophenyl)- -hydroxy-, ethyl ester.

p-Chloro-m-cresol; 4-Chloro-3-methylphenol 59-50-7 Phenol, 4-chloro-3-methyl-

Chloroethane; Ethyl chloride 75-00-3 Ethane, chloro-

Chloroform; Trichloromethane 67-66-3 Methane, trichloro-

2-Chloronaphthalene 91-58-7 Naphthalene, 2-chloro-

2-Chlorophenol 95-57-8 Phenol, 2-chloro-

4-Chlorophenyl phenyl ether 7005-72-3 Benzene, 1-chloro-4-phenoxy-

Chloroprene 126-99-8 1,3-Butadiene, 2-chloro-

Chromium (Total) Chromium

Chrysene 218-01-9 Chrysene

Cobalt (Total) Cobalt

Copper (Total) Copper

m-Cresol; 3-Methylphenol 108-39-4 Phenol, 3-methyl-

o-Cresol; 2-Methylphenol 95-48-7 Phenol, 2-methyl-

p-Cresol; 4-Methylphenol 106-44-5 Phenol, 4-methyl-

Cyanide 57-12-5 Cyanide

2,4-D; 2,4-Dichlorophenoxyacetic acid 94-75-7 Acetic acid, (2,4-dichlorophenoxy)-

4,4′-DDD 72-54-8 Benzene 1,1′-(2,2-dichloroethylidene) bis[4-chloro-

4,4′-DDE 72-55-9 Benzene, 1,1′-(dichloroethenylidene) bis[4-chloro-

4,4′-DDT 50-29-3 Benzene, 1,1′-(2,2,2-trichloroethylidene) bis[4-chloro-

Diallate 2303-16-4 Carbamothioic acid, bis(1-methylethyl)-, S- (2,3-dichloro-2-propenyl) ester.

Dibenz[a,h]anthracene 53-70-3 Dibenz[a,h]anthracene

Dibenzofuran 132-64-9 Dibenzofuran

Dibromochloromethane; Chlorodibromomethane 124-48-1 Methane, dibromochloro-

1,2-Dibromo-3-chloropropane; DBCP 96-12-8 Propane, 1,2-dibromo-3-chloro-

1,2-Dibromoethane; Ethylene dibromide; EDB 106-93-4 Ethane, 1,2-dibromo-

Di-n-butyl phthalate 84-74-2 1,2-Benzenedicarboxylic acid, dibutyl ester

o-Dichlorobenzene; 1,2-Dichlorobenzene 95-50-1 Benzene, 1,2-dichloro-

m-Dichlorobenzene; 1,3-Dichlorobenzene 541-73-1 Benzene, 1,3-dichloro-

p-Dichlorobenzene; 1,4-Dichlorobenzene 106-46-7 Benzene, 1,4-dichloro-

3,3′-Dichlorobenzidine 91-94-1 [1,1′-Biphenyl]-4,4′-diamine, 3,3′-dichloro-

trans-1,4-Dichloro-2-butene 110-57-6 2-Butene, 1,4-dichloro-, (E)-

Dichlorodifluoromethane; CFC 12 75-71-8 Methane, dichlorodifluoro-

1,1-Dichloroethane; Ethyldidene chloride 75-34-3 Ethane, 1,1-dichloro-

1,2-Dichloroethane; Ethylene dichloride 107-06-2 Ethane, 1,2-dichloro-

1,1-Dichloroethylene; 1,1-Dichloroethene; 75-35-4 Ethene, 1,1-dichloro-

Vinylidene chloride cis-1,2-Dichloroethylene; cis-1,2-Dichloroethene 156-59-2 Ethene, 1,2-dichloro-(Z)-

trans-1,2-Dichloroethylene; trans-1,2-Dichloroethene 156-60-5 Ethene, 1,2-dichloro-, (E)-

2,4-Dichlorophenol 120-83-2 Phenol, 2,4-dichloro-

2,6-Dichlorophenol 87-65-0 Phenol, 2,6-dichloro-

1,2-Dichloropropane 78-87-5 Propane, 1,2-dichloro-

1,3-Dichloropropane; Trimethylene dichloride 142-28-9 Propane, 1,3-dichloro-

2,2-Dichloropropane; Isopropylidene chloride 594-20-7 Propane, 2,2-dichloro-

1,1-Dichloropropene 563-58-6 1-Propene, 1,1-dichloro-

cis-1,3-Dichloropropene 10061-01-5 1-Propene, 1,3-dichloro-, (Z)-

trans-1,3-Dichloropropene 10061-02-6 1-Propene, 1,3-dichloro-, (E)-

Dieldrin 60-57-1 2,7:3,6-Dimethanonaphth [2,3-b]oxirene, 3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-, (1aα,2β,2aα,3β,6β,6aα,7β,7aα)-

Diethyl phthalate 84-66-2 1,2-Benzenedicarboxylic acid, diethyl ester

O,O-Diethyl O-2-pyrazinyl phosphorothioate; Thionazin 297-97-2 Phosphorothioic acid, O,O-diethyl O-pyrazinyl ester.

Dimethoate 60-51-5 Phosphorodithioic acid, O,O-dimethyl S-[2-(methylamino)-2-oxoethyl] ester

p-(Dimethylamino)azobenzene 60-11-7 Benzenamine, N,N-dimethyl-4-(phenylazo)-

7,12-Dimethylbenz[a]anthracene 57-97-6 Benz[a]anthracene, 7,12-dimethyl-

3,3′-Dimethylbenzidine 119-93-7 [1,1′-Biphenyl]-4,4′-diamine, 3,3′-dimethyl-

alpha, alpha-Dimethylphenethylamine 122-09-8 Benzeneethanamine, α,α-dimethyl-

2,4-Dimethylphenol; m-Xylenol 105-67-9 Phenol, 2,4-dimethyl-

Dimethyl phthalate 131-11-3 1,2-Benzenedicarboxylic acid, dimethyl ester

m-Dinitrobenzene 99-65-0 Benzene, 1,3-dinitro-

4,6-Dinitro-o-cresol; 4,6-Dinitro-2-methylphenol 534-52-1 Phenol, 2-methyl-4,6-dinitro-

2,4-Dinitrophenol 51-28-5 Phenol, 2,4-dinitro-

2,4-Dinitrotoluene 121-14-2 Benzene, 1-methyl-2,4-dinitro-

2,6-Dinitrotoluene 606-20-2 Benzene, 2-methyl-1,3-dinitro-

Dinoseb; DNBP; 2-sec-Butyl-4,6-dinitrophenol 88-85-7 Phenol, 2-(1-methylpropyl)-4,6-dinitro-

Di-n-octyl phthalate 117-84-0 1,2-Benzenedicarboxylic acid, dioctyl ester

Diphenylamine 122-39-4 Benzenamine, N-phenyl-

Disulfoton 298-04-4 Phosphorodithioic acid, O,O-diethyl S-[2- (ethylthio)ethyl] ester

Endosulfan I 959-98-8 6,9-Methano-2,4,3-benzodiox-athiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3-oxide,

Endosulfan II 33213-65-9 6,9-Methano-2,4,3-benzodioxathiepin, 6,7,8,9,10,10-hexachloro- 1,5,5a,6,9,9a-hexahydro-, 3-oxide, (3α,5aα,6β,9β, 9aα)-

Endosulfan sulfate 1031-07-8 6,9-Methano-2,4,3-benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3,3-dioxide

Endrin 72-20-8 2,7:3,6-Dimethanonaphth[2,3-b]oxirene, 3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-, (1aα, 2β,2aβ, 3α,6α,6aβ,7β,7aα)-

Endrin aldehyde 7421-93-4 1,2,4-Methenocyclo-penta[cd]pentalene-5-carboxaldehyde,2,2a,3,3,4,7-hexachlorodecahydro- (1α,2β,2aβ,4β,4aβ,5β,6aβ,6bβ,7R*)-

Ethylbenzene 100-41-4 Benzene, ethyl-

Ethyl methacrylate 97-63-2 2-Propenoic acid, 2-methyl-, ethyl ester

Ethyl methanesulfonate 62-50-0 Methanesulfonic acid, ethyl ester

Famphur 52-85-7 Phosphorothioic acid, O-[4-[(dimethylamino)sulfonyl]phenyl]-O,O-dimethyl ester

Fluoranthene 206-44-0 Fluoranthene

Fluorene 86-73-7 9H-Fluorene

Heptachlor 76-44-8 4,7-Methano-1H-indene,1,4,5,6,7,8,8-heptachloro-3a,4,7,7a-tetrahydro-

Heptachlor epoxide 1024-57-3 2,5-Methano-2H-indeno[1,2-b]oxirene, 2,3,4,5,6,7,7-heptachloro-1a,1b,5,5a,6,6a,-hexahydro-,(1aα,1bβ,2α,5α,5aβ,6β,6aα)

Hexachlorobenzene 118-74-1 Benzene, hexachloro-

Hexachlorobutadiene 87-68-3 1,3-Butadiene, 1,1,2,3,4,4-hexachloro-

Hexachlorocyclopentadiene 77-47-4 1,3-Cyclopentadiene, 1,2,3,4,5,5-hexachloro-

Hexachloroethane 67-72-1 Ethane, hexachloro-

Hexachloropropene 1888-71-7 1-Propene, 1,1,2,3,3,3-hexachloro-

2-Hexanone; Methyl butyl ketone 591-78-6 2-Hexanone

Indeno(1,2,3-cd)pyrene 193-39-5 Indeno[1,2,3-cd]pyrene

Isobutyl alcohol 78-83-1 1-Propanol, 2-methyl-

Isodrin 465-73-6 1,4,5,8-Dimethanonaphthalene,1,2,3,4,1 0,10-hexachloro-1,4,4a,5,8,8a hexahydro-(1α, 4α, 4aβ,5β,8β,8aβ)-

Isophorone 78-59-1 2-Cyclohexen-1-one, 3,5,5-trimethyl-

Isosafrole 120-58-1 1,3-Benzodioxole, 5-(1-propenyl)-

Kepone 143-50-0 1,3,4-Metheno-2H-cyclobuta-[cd]pentalen-2-one, 1,1a,3,3a,4,5,5,5a,5b,6-decachlorooctahydro-

Lead (Total) Lead

Mercury (Total) Mercury

Methacrylonitrile 126-98-7 2-Propenenitrile, 2-methyl-

Methapyrilene 91-80-5 1,2,Ethanediamine, N,N-dimethyl-N′-2-pyridinyl-N′-(2-thienylmethyl)-

Methoxychlor 72-43-5 Benzene, 1,1′-(2,2,2,trichloroethylidene)bis [4-methoxy-

Methyl bromide; Bromomethane 74-83-9 Methane, bromo-

Methyl chloride; Chloromethane 74-87-3 Methane, chloro-

3-Methylcholanthrene 56-49-5 Benz[j]aceanthrylene, 1,2-dihydro-3-methyl-

Methyl ethyl ketone; MEK; 2-Butanone 78-93-3 2-Butanone

Methyl iodide; Iodomethane 74-88-4 Methane, iodo-

Methyl methacrylate 80-62-6 2-Propenoic acid, 2-methyl-, methyl ester

Methyl methanesulfonate 66-27-3 Methanesulfonic acid, methyl ester

2-Methylnaphthalene 91-57-6 Naphthalene, 2-methyl-

Methyl parathion; Parathion methyl 298-00-0 Phosphorothioic acid, O,O-dimethyl

4-Methyl-2-pentanone; Methyl isobutyl ketone 108-10-1 2-Pentanone, 4-methyl-

Methylene bromide; Dibromomethane 74-95-3 Methane, dibromo-

Methylene chloride; Dichloromethane 75-09-2 Methane, dichloro-

Naphthalene 91-20-3 Naphthalene

1,4-Naphthoquinone 130-15-4 1,4-Naphthalenedione

1-Naphthylamine 134-32-7 1-Naphthalenamine

2-Naphthylamine 91-59-8 2-Naphthalenamine

Nickel (Total) Nickel

o-Nitroaniline; 2-Nitroaniline 88-74-4 Benzenamine, 2-nitro-

m-Nitroaniline; 3-Nitroaniline 99-09-2 Benzenamine, 3-nitro-

p-Nitroaniline; 4-Nitroaniline 100-01-6 Benzenamine, 4-nitro-

Nitrobenzene 98-95-3 Benzene, nitro-

o-Nitrophenol; 2-Nitrophenol 88-75-5 Phenol, 2-nitro-

p-Nitrophenol; 4-Nitrophenol 100-02-7 Phenol, 4-nitro-

N-Nitrosodi-n-butylamine 924-16-3 1-Butanamine, N-butyl-N-nitroso-

N-Nitrosodiethylamine 55-18-5 Ethanamine, N-ethyl-N-nitroso-

N-Nitrosodimethylamine 62-75-9 Methanamine, N-methyl-N-nitroso-

N-Nitrosodiphenylamine 86-30-6 Benzenamine, N-nitroso-N-phenyl-

N-Nitrosodipropylamine; N-Nitroso-N-dipropylamine; Di-n-propylnitrosamine 621-64-7 1-Propanamine, N-nitroso-N-propyl-

N-Nitrosomethylethalamine 10595-95-6 Ethanamine, N-methyl-N-nitroso-

N-Nitrosopiperidine 100-75-4 Piperidine, 1-nitroso-

N-Nitrosopyrrolidine 930-55-2 Pyrrolidine, 1-nitroso-

5-Nitro-o-toluidine 99-55-8 Benzenamine, 2-methyl-5-nitro-

Parathion 56-38-2 Phosphorothioic acid, O,O-diethyl-O-(4-nitrophenyl) ester

Pentachlorobenzene 608-93-5 Benzene, pentachloro-

Pentachloronitrobenzene 82-68-8 Benzene, pentachloronitro-

Pentachlorophenol 87-86-5 Phenol, pentachloro-

Phenacetin 62-44-2 Acetamide, N-(4-ethoxyphenyl)

Phenanthrene 85-01-8 Phenanthrene

Phenol 108-95-2 Phenol

p-Phenylenediamine 106-50-3 1,4-Benzenediamine

Phorate 298-02-2 Phosphorodithioic acid, O,O-diethyl S- [(ethylthio)methyl] ester

Polychlorinated biphenyls; PCBs See footnote 6 1,1′-Biphenyl, chloro derivatives

Pronamide 23950-58-5 Benzamide, 3,5-dichloro-N-(1,1-dimethyl-2-propynyl)-

Propionitrile; Ethyl cyanide 107-12-0 Propanenitrile

Pyrene 129-00-0 Pyrene

Safrole 94-59-7 1,3-Benzodioxole, 5-(2- propenyl)-

Selenium (Total) Selenium

Silver (Total) Silver

Silvex; 2,4,5-TP 93-72-1 Propanoic acid, 2-(2,4,5- trichlorophenoxy)-

Styrene 100-42-5 Benzene, ethenyl-

Sulfide 18496-25-8 Sulfide

2,4,5-T; 2,4,5-Trichlorophenoxyacetic acid 93-76-5 Acetic acid, (2,4,5- trichlorophenoxy)-

2,3,7,8-TCDD; 2,3,7,8-Tetrachlorodibenzo- p-dioxin 1746-01-6 Dibenzo[b,e][1,4]dioxin, 2,3,7,8-tetrachloro-

1,2,4,5-Tetrachlorobenzene 95-94-3 Benzene, 1,2,4,5-tetrachloro-

1,1,1,2-Tetrachloroethane 630-20-6 Ethane, 1,1,1,2-tetrachloro-

1,1,2,2-Tetrachloroethane 79-34-5 Ethane, 1,1,2,2-tetrachloro-

Tetrachloroethylene; Tetrachloroethene; Perchloroethylene 127-18-4 Ethene, tetrachloro-

2,3,4,6-Tetrachlorophenol 58-90-2 Phenol, 2,3,4,6-tetrachloro-

Thallium (Total) Thallium

Tin (Total) Tin

Toluene 108-88-3 Benzene, methyl-

o-Toluidine 95-53-4 Benzenamine, 2-methyl-

Toxaphene See footnote 7 Toxaphene

1,2,4-Trichlorobenzene 120-82-1 Benzene, 1,2,4-trichloro-

1,1,1-Trichloroethane; Methylchloroform 71-55-6 Ethane, 1,1,1-trichloro-

1,1,2-Trichloroethane 79-00-5 Ethane, 1,1,2-trichloro-

Trichloroethylene; Trichloroethene 79-01-6 Ethene, trichloro-

Trichlorofluoromethane; CFC-11 75-69-4 Methane, trichlorofluoro-

2,4,5-Trichlorophenol 95-95-4 Phenol, 2,4,5-trichloro-

2,4,6-Trichlorophenol 88-06-2 Phenol, 2,4,6-trichloro-

1,2,3-Trichloropropane 96-18-4 Propane, 1,2,3-trichloro-

O,O,O-Triethyl phosphorothioate 126-68-1 Phosphorothioic acid, O,O,O-triethyl ester

sym-Trinitrobenzene 99-35-4 Benzene, 1,3,5-trinitro-

Vanadium (Total) Vanadium

Vinyl acetate 108-05-4 Acetic acid, ethenyl ester

Vinyl chloride; Chloroethene 75-01-4 Ethene, chloro-

Xylene (total) See footnote 8 Benzene, dimethyl-

Zinc (Total) Zinc

1 Common names are those widely used in government regulations, scientific publications, and commerce; synonyms exist for many chemicals.

2 Chemical Abstracts Service registry number. Where “Total” is entered, all species in the ground water that contain this element are included.

3 CAS index names are those used in the 9th Cumulative Index.

4 This substance is often called bis(2-chloroisopropyl) ether, the name Chemical Abstracts Service applies to its noncommercial isomer, propane, 2,2″-oxybis[2-chloro-(CAS RN 39638-32-9).

5 Chlordane: This entry includes alpha-chlordane (CAS RN 5103-71-9), beta-chlordane (CAS RN 5103-74-2), gamma-chlordane (CAS RN 5566-34-7), and constituents of chlordane (CAS RN 57-74-9 and CAS RN 12789-03-6).

6 Polychlorinated biphenyls (CAS RN 1336-36-3); this category contains congener chemicals, including constituents of Aroclor-1016 (CAS RN 12674-11-2), Aroclor-1221 (CAS RN 11104-28-2), Aroclor-1232 (CAS RN 11141-16-5), Aroclor-1242 (CAS RN 53469-21-9), Aroclor-1248 (CAS RN 12672-29-6), Aroclor-1254 (CAS RN 11097-69-1), and Aroclor-1260 (CAS RN 11096-82-5).

7 Toxaphene: This entry includes congener chemicals contained in technical toxaphene (CAS RN 8001-35-2), i.e., chlorinated camphene.

8 Xylene (total): This entry includes o-xylene (CAS RN 96-47-6), m-xylene (CAS RN 108-38-3), p-xylene (CAS RN 106-42-3), and unspecified xylenes (dimethylbenzenes) (CAS RN 1330-20-7).