ILLINOIS POLLUTION CONTROL BOARD

August 26,

1993

IN THE MATTER OF:

)

TOXIC AIR CONTAMINANTS LIST,

)

R90-l(D)

STYRENE

(35 Ill. ADM. CODE

)

(Rulemaking)

232.Appendix

A)

Proposed Rule.

First Notice.

OPINION

AND

ORDER OF THE

BOARD

(by C.

A.

Manning):

On September

3,

1992, the Board added to its rules

a list of

263 toxic air contaminants which may pose a significant risk to

human health,

as mandated by Section 9.5(c)

of the Environmental

Protection Act

(Act).

(415 ILCS 5/9.5(c)

(1992))(In Re:

Air

Toxic Contaminants List (September

3,

1992) R90-1(A)

135 PCB

583).

The Air Toxics rulemaking was initiated by a proposal

filed by the Illinois Environmental Protection Agency (Agency) on

January

2,

1990.1

Due to the nature of some of the questions

arising during the public hearing and comment periods in docket

R90-l(A)

Toxic Air Contaminants List,

the Board deferred action

on some issues, to Dockets R90-l(B),

(C),

and

(D).

Today the

Board is addressing only Docket R90-1(D),

In Re:

Toxic Air

Contaminants List, Styrene.

On June

4,

1992, the Board authorized submittal of a revised

set of rules to the Joint Committee on Administrative Rules

(JCAR)

for second notice review.

These rules were considered by

JCAR at its July 14 and August

11,

1992, meetings.

JCAR issued

an objection to the listing of one chemical, styrene.

(16 Ill.

Reg.

13372, August 28,

1992.)

In response to the objection, by

separate action in RES 92-1, the Board deleted styrene from the

list,

and opened R90-1, Docket D in order to further consider

styrene.

This

is discussed in detail

in the Board’s resolution

and order In Re:

Toxic Air Contaminants List (September

3,

1991)

RES 92—1,

R90—1(A)

and R90—1(D),

135 PCB 625.

On October

1,

1992,

the Board

issued an order requesting

public comments

in this matter.

The Board received three

1The Air Toxic rules were proposed for

first notice

by the

Board’s opinion and order of April 26,

1990,

and were published in

the Illinois Register on June

8,

1990.

(14

Ill.

Reg.

8905).

A

second

first notice proposal was adopted on September 26,

1991,

and published

in the Illinois Register on October

18,

1991.

(15

Ill. Reg. 14969).

The Board proposed these rules for second notice

in its opinion and order of June

4,

1992.

On September

3,

1992,

the Board adopted a final notice opinion and order in this matter.

(16 Ill.

Reg.

16592.)

---

2

comments

(PC.

#68,

69,

and 70)2 in response to this request.

On

November

19,

1992,

the Board issued an order establishing a two

week period in which interested parties could respond to the

comments.

On December

3,

1992,

the Board extended the response

period by two weeks until December 30,

1992.

The Board received

one response.

Discussion

The Board today has two options.

It may either proceed with

the listing of styrene by initiating a first notice publication

of the proposed rule in the Illinois Register or not proceed with

the listing of styrene and dismiss this docket.

In order to

determine the appropriate course of action in this matter, the

Board must consider two issues:

1.

Are the data on the mutagenicity of styrene submitted by

the Styrene Information and Research Center

(SIRC)

persuasive enough to override the determination by the

International Agency for Research on Cancer

(IARC)

that

styrene should be considered a potential human health

threat?

2.

If SIRC’s data are accepted, are the effects produced by

styrene, as documented in the exhibits

in the record, such

that the statutory definition of a Toxic Air Contaminant

(TAC)

does not apply?3

The Board will consider these issues in light of the information

contained in the docket

(A)

record and the public comments and

responses received on the issue of styrene.

On July 14,

1992,

SIRC filed comments to JCAR that assert

that:

SIRC’s numerous submissions to the Board

include a review by SIRC of all the animal,

human,

inutagenic, and genotoxic studies

2The

public

comments

were

numbered

consecutively

with

following

those filed

in the other subdockets.

3The statutory definition of TAC

is found at Section 9.5(c)

of the Act.

Section 9.5(c)

states, that the toxic air

contaminant list published under this subsection shall include,

“any air contaminant which may cause or significantly contribute

to an increase in mortality or an increase in serious

irreversible or incapacitating reversible illness,

or may pose a

significant threat to human health or the environment.”

(See

Also,

35 Ill.

Adm. Code 232.200)

---

3

relied on by

IARC.

In addition SIRC

submitted reviews of the animal,

human,

and

mutagenic/genotoxic literature for styrene

prepared by leading experts.

These

submissions, which we believe were never

considered by the Board or IEPA,

demonstrate

that styrene does not merit classification as

a carcinogen and does not, therefore,

meet

the statutory definition of a TAC.

(7/14/92

Comments of SIRC before JCAR at 4.)

However,

in PC.

#68 the Agency urges the Board to proceed

with the listing of styrene.

The Agency asserts that styrene is

a 2B carcinogen and should be listed.

The Agency’s comments

explain that its determination is based at least in part on

IARC’s determination that styrene is carcinogenic.

The Agency

also states in PC.

#68 that it does not feel that SIRC has

rebutted IARC’s determination.

The Agency in PC.

#68 contends that:

SIRC has submitted information concerning

styrene which the Agency believes represents

a biased opinion of SIRC scientists.

SIRC

re-reviewed the same studies utilized by IARC

when IARC concluded that styrene is

carcinogenic.

The resulting analysis

presented by SIRC does not rebut the decision

by

IARC.

The Agency has examined SIRC’s

submissions and has found nothing to clearly

refute the IARC conclusion.

SIRC has

presented nothing new.

Based on this, the

Agency maintains that,

since styrene falls

within the accepted listing criteria, styrene

should be listed.

(PC. #68 at 4.)

The Agency also states that,

“the Agency

is not in a position to

dispute the judgement of an internationally recognized carcinogen

listing source such as IARC”

(PC.

#68 at

4)

and notes that,

“styrene is listed as a Hazardous Air Pollutant in the Clean Air

Act at 42 U.S.C.

§7412.”

(Id.),

a fact also acknowledged by SIRC

(7/14/92 SIRC before JCAR at 1).

In its most recent comment

(PC. #69)

SIRC states that it

believes that it has submitted sufficient evidence to demonstrate

that styrene

is not a carcinogen.

It is SIRC’s position that the

genotoxicity data about styrene does not provide a clear basis to

conclude that styrene should be classified as a carcinogen.

SIRC

also comments that its purpose is to reiterate its position which

it feels has been made clear

in its previous comments.

Specifically,

SIRC refers to SIRC exhibit #1 attachments A—G,

SIRC exhibits

#2-5,

PC. #29 and PC.

#54.

The Board notes that in

---

4

addition to SIRC’s testimony and exhibits submitted at the

Board’s September

6,

and 7,

1990,

hearings, the Board has on file

prefiled testimony from the following dates:

August

24,

1990,

March 11,

1991,

and December 24,

1991,

submitted by SIRC.

Additionally, the Board notes that on December 31,

1991,

SIRC

submitted questions to the Board directed to the Agency.

The following is a list of SIRC exhibit #1 attachments A-G

submitted as prefiled testimony in support of SIRC’s position

that styrene should not be listed:

A.

Bodner,

KM, GG Bond,

and RR Cook.

28 September 1987.

Review of Recent Epidemiology Studies Assessing the

Association between Cancers of the Lymphatic and

Hematopoietic Tissues and Occupational Exposures to

Styrene.

Prepared by: Epidemiology Health and

Environmental Sciences, The Dow Chemical Company.

Sponsored by:

The Styrene Information

& Research

Center.

B.

CanTox,

Inc..

21 July 1989.

A Review of Styrene

Pharmacokinetics and Carcinogenicity.

Prepared for:

Styrene Information

& Research Center.

Prepared by:

CanTox,

Inc. Oakville, Ontario.

C.

Preston, RJ.

Styrene

(Vinyl Benzene) and its

Metabolites:

A Discussion of Results from Assays for

Detecting Chromosomal Aberrations and Sister Chrornatid

Exchanges.

Biology Division Oakridge National

Labrotory,

Oakridge, Tennessee.

D.

Preston,

RJ. April

1990.

The Potential Mutagenicity of

Styrene and its Metabolites.

reprinted from The SIRC

Review pp.

25-31.

E.

tJSEPA.

March

1990.

Re-evaluation of Issues Concerning

the Health Effects of Ingested Styrene.

Report of the

Drinking Water Committee, Science Advisory Board.

DRAFT Report.

F.

USEPA communication from Charles Ris, Deputy Director,

Human Health Assessment Group to Ms. Suzanne Gardner,

Louisiana Department of Environmental Quality dated

September 18,

1989

(shows EPA cancer assessment for

styrene to be pending).

G.

Alexander,

N.

April

1990.

The Environmental Fate of

Styrene. Reprinted from The SIRC. Review pp.

33-42.

The Board has examined the data provided by SIRC and has not

found it to be persuasive.

Three of the five referenced

publications sponsored by SIRC lack external verification or peer

---

5

review.

Of the remaining two, there is no indication when and

where one was published and the other is

a draft document of the

USEPA’s Science Advisory Board Drinking Water Committee.

There

is also no indication that any of these latter documents have

been subject to verification or an external peer review.

Although this “grey literature” arguably contains valid

scientific conclusions, the Board asserts that it has not been

subject to a rigorous enough review to overturn the conclusions

of an international agency that specializes in reviewing studies

on carcinogenicity,

mutagenicity, and genotoxicity.

The Board

also notes that although SIRC states that these reports were

prepared by “leading experts”, there

is little in the record to

apprise the Board of these experts’ qualifications.

In addition to the comments discussed above,

the Board

received two other filings regarding styrene.

Both filings

support the Board’s conclusion that styrene should be listed.

The first comment received was a collective comment from the

Sierra Club along with the Coalition for Consumer Rights and the

Chicago Lung Association (Sierra Club et al.)

(PC. #70).

Sierra

Club et al. commented that it is their belief that the literature

demonstrates the serious chronic toxicity effects of styrene

exposure.

Thus, they argue, regardless of styrene’s

carcinogenicity effects,

it should be listed because of its

chronic toxicity.

(PC. #70 at 3.)

On December

18,

1992,

the Agency filed a response to the

comments of Sierra Club et al..4

In the response, the Agency

states that it “maintains its position that styrene be listed

based on the classification of the International Agency for

Research on Cancer”.

(jçj. at 1.)

The Agency also states that it

has not performed an independent analysis of the toxicity of

styrene because there is sufficient evidence supporting the

listing of styrene as a carcinogen.

(Id at 2.)

CONCLUSION

The Board has reviewed the data and testimony in the record,

the public comments,

and the responses to the public comments.

Based on its review,

the Board today proposes for first notice

publication an order that would add the chemical styrene to the

list of toxic air contaminants at 35

Ill.

Adm. Code 232.Appendix

A.

The Board notes that once this notice

is published in the

Illinois Register,

interested parties will have forty-five days

to file comments on the proposed amendment.

The Board does not

intend to conduct another hearing in this matter unless a hearing

is requested pursuant to Section 5—40

of the Illinois

4No public comment number was given to this document.

---

6

Administrative Procedure Act.

(5 ILCS 100/5-40.)

ORDER

The Board hereby proposes for first notice publication the

addition of the chemical styrene to the list of toxic air

contaminants at 35

Ill. Adm. Code

232.Appendix A.

The Clerk of

the Board is directed to file the proposed amendment with the

Secretary of State for publication in the Illinois Register.

TITLE

35:

ENVIRONMENTAL PROTECTION

SUBTITLE B: AIR POLLUTION

CHAPTER

I: POLLUTION CONTROL BOARD

SUBCHAPTER

f: TOXIC AIR CONTAMINANTS

PART 232

TOXIC AIR CONTAMINANTS

SUBPART A:

GENERAL PROVISIONS

Section

232.100

Introduction

232.110

Incorporations by Reference

232.120

Definitions

232.130

Applicability

SUBPART

B:

DETERMINATION OF A TOXIC AIR CONTAMINANT

Section

232.200

Characteristics for Determining a Toxic Air Contaminant

SUBPART C:

PROCEDURES FOR EVALUATING CHARACTERISTICS

OF A TOXIC AIR CONTAMINANT

Section

232.300

Purpose

232.310

Procedures for Determining the Toxicity Score

232.320

Carcinogen Classification

SUBPART E:

LISTING AND

DELISTING

Section

232.500

Procedures

for Listing and Delisting Toxic Air

Contaminants

---

7

232.Appendix A

List of Toxic Air Contaminants

232.Appendix B

Additional Procedures for Calculating the Chronic

Toxicity score

232.Appendix C

Carcinogens

(Categories A,

B?,

and B2) listed on

the Integrated Risk Information System’(IRIS)

as

of December 31,

1989

(Unites States Environmental

Protection Agency, Office of Health and

Environmental Assessment)

AUTHORITY:

Implementing Section 9.5 and authorized by Section 27

of the Environmental Protection Act

(Ill.

Rev.

Stat.

1991,

ch.

111 1/2,

pars.

1009.5 and 1027.

SOURCE:

Adopted in R90—1 at

16 Ill. Reg.

16592 effective

October

18,

1992.

Section 232.Appendix A

List of Toxic Air Contaminants

Chemical Abstract

Chemical

Name

Service Number

Acetaldhyde

75—07-0

Acetamide

60-35—5

Acetonitrile

75—05-8

Acetophenone

98-86-2

Acrolein

107—02—8

Acrylamide

79-06—1

Acrylic acid

79-10—7

Acrylonitrile

107-13-1

Aldrin

309—00—2

Ally? chloride

107—05—1

2-Aminoanthraquinone

117-79—3

4—Aminoazobenzene

60—09—3

o—Aminoazotoluene

93—56-3

4—Aminobiphenyl

92-67-1

1-Amino-2-methylanthraquinone

82-28-0

Axnitrole

61—82—5

Aniline

62—53—3

o—Anisidine

90—04-0

o-Anisidine hydrochloride

134—29-2

Antimony

7440-36-0

Arsenic

7440—38—2

Asbestos(friable)

1332—21—4

Azobenzene

103—33—3

Benz (a)anthracene

56—55—3

Benzene

71—43—2

Benzidine

92—87—5

Benzo(a)pyrene

50-32-8

Benzo(b)fluotanthene

205—99—2

Berizo(j)fluoranthene

205—82—3

---

B

Benzo (k)

fluoranthene

Benzotrichlorjde

Benzyl chloride

Benzyl violet

Beryllium

Beryllium oxide

Biphenyl

Boron trifluoride

Broinoform

1, 3—Butadiene

Butyl benzyl phthalate

beta-Butyrolacetone

C.I. Basic Red

9

monohydrochioride

Cadmium

Cadmium oxide

Caprolactam

Carbaryl

Carbofuran

Carbon black

Carbon disulfide

Carbon tetrachioride

Carbosulfan

Chloramben

Chlordane

Chlorinated dibenzodioxins

Chlorinated dibenzofurans

Chlorendic acid

Alpha-Chlorinated toluenes

Chlorinated paraffins (C1260

chlorine)

Chlorine

Chloroacetic acid

Chlorobenzene

Chloroform

Chloromethyl methyl ether

4-Chloro-2-methylpropene

4-Chloro—o-phenylenediamine

p-Chloro-o-toluidine

Chloroprene

Chromium

Chromium VI

Chrysene

Coal tar(pitch)volatiles

Cobalt

Coke Oven Emissions

Copper

p-Cresidine

Creosote

(Coal)

Cresol

(mixed isomers)

cyanazme

Cyclohexarione

DDD

DDE

207—08—9

98—07—7

100—44—7

1694—09—3

7440—41—7

1304—56—9

92—52—4

7637—07—2

75—25—2

106—99—0

85—68—7

3068—88—0

569—61—9

7440—43—9

1306—19—0

105—60—2

63—25—2

1563—66—2

1333—86—4

75—15—0

56—23—5

55285—14—8

133—90—4

57—74—9

115—28—6

108171—26—2

7782—50—5

79—11—8

108—90—7

67—66—3

107—30—2

563—47—3

95—83—0

95—69—2

126—99—8

7440—47—3

18540—29—9

218—01—9

65996—93—2

7440—48—4

7440—50—8

120—71—8

8001—58—9

1319—77—3

21725—46—2

108—94—1

72—54—8

72—55—9

---

9

DDT

50—29—3

2, 4—Diaminoanisole

615—05—4

2,4-Diaminoanisole sulfate

39156—41—7

4, 4

‘

—Diaminodiphenyl ether

101—80—4

2

,

4—Diaminotoluene

95—80—7

Dibenzo(a,h)acridine

226—36—8

Dibenzo(a,j)acridine

224—42—0

Dibenzo(a,h)anthracene

53—70-3

Dibenzo(a,e)pyrene

192-65-4

Dibenzo(a,h)pyrene

189—64—0

Dibenzo(a,i)pyrene

189—55—9

Dibenzo(a, 1)pyrene

191—30—0

Dibutyl phthalate

84-74-2

1, 2—Dibromo-3-chloropropane

96-12—8

1,2-Dibromoethane

(Ethylene dibromide

106-93-4

3, 31—Dichlorobenzidine

91—94—1

3, 31—Dichlorobenzidine dihydrochloride

612—83—9

Dichloroethyl ether

111—44—4

2,4-Dichlorophenoxyacetic acid

(2 ,4—D)

94-75—7

1,2-Dichloropropane

78-87—5

1,3—Dichloropropylene

542—75—6

Dichlorvos

62-73-7

Dieldrin

60—57—1

Diepoxybutane

1464-53-5

1, 2—Diethylhydrazine

1615—80—1

Di (2—ethylhexyl) phthalate

117—81—7

Diethyl sulfate

64—67—5

Diglycidyl resorcinol ether

101-90-6

3, 31—Dimethoxybenzidine

119—90—4

Dimethyl

acetamide

127-19—5

4-Dimethylaminoazobenzene

60-11—7

3, 31-Dimethylbenzidine o-Tolidine)

119-93-7

Dimethylcarbamoyl chloride

79-44-7

Dimethyl

formamide

68-12—2

1, l-Diinethylhydrazine

57-14-7

1, 2-Dimethylhydrazine

54 0—73—8

Dimethyl sulfate

77—78—1

Dinitrocresol

534—52—1

2

,

4—Dinitrophenol

51—28—5

2, 4-DinitrotolUene

121-14—2

l,4—Dioxane

123—91—1

1, 2—Diphenylhydrazine

122—66—7

DisulfotOfl

298—04—4

Endoth~ll

145—73—3

Epichiorohydrin

106-89-8

2-Ethoxyethanol

110-80-5

Ethyl acrylate

140-88—5

Ethylene didhioride

107—06—2

Ethylene oxide

75-21—8

Ethylene thiourea

96—45—7

Etridiazole

2593—15—9

FNC—67825

95465—99—9

---

10

Fluorine

7782—41—4

Folpet

133—07—3

Formaldehyde

50-00-0

Furinecyclox

60568-05-0

Heptachlor

76-44-8

Heptachior

epoxide

1024-57-3

Hexachlorobenzene

118-74-1

Hexachloro-1,3-butadiene

87-68-3

Hexachiorocyclopentadiene

77-47-4

Hexachlorodibenzo-p-dioxin

19408-74-3

Hexachloroethane

67-72—1

Hexamethyiphosphoramide

680-31—9

Hydrazine

302—01—2

Hydrazine sulfate

10034—93—2

Hydrogen cyanide

74-90-8

Indeno(1,2,3—cd)pyrene

193—39—5

Isophorone diisocyanate

4098-71—9

Lead

7439—92—1

Lindane

(alpha)

319—84—6

Lindane

(beta)

319—85—7—

Lindane

(gamma)

58—89—9

Lindane

(mixed isomers)

608—73-1

Linuron

330-55-2

Malathion

121—75-5

Manganese

7439—96—5

Mercury

7439—97—6

2—Nethoxyethanol

109—86—4

2—Methoxyethanol acetate

110-49-6

5-Methylchrysene

3697-24-3

4, 41—Nethylenebis(2—chloroaniline)

101—14—4

Methylenebis (phenylisocyanate)

101—68—8

4, 41-Methylenebis(N,Nt—dimethyl) benzenamine

101-61-1

Methylene chloride

75-09-2

4,41—Methylenedianiline

101—77—9

4,41—Methylenedianiline dihydrochloride

13552—44—8

Methyl hydrazine

60—34—4

Methyl iodide

74-88-4

Methyl

mercaptan

74-93-1

N-Methyl-NI-nitro-N-nitrosoguanidine

70-25-7

Metolachior

51218—45—2

Michler’s Ketone

90—94—8

Mirex

2385—85—5

Nonoethanolamine

141-43-5

beta-Naphthylamide

91—59—8

Nickel

7440—02—0

Nitric acid

7697—37—2

Nitrilotriacetic acid

139—13—9

Nitrobenzene

98-95-3

5—Nitro—o—anisidine

99—59—2

2—Nitropropane

79—46—9

N—Nitroso-n-butyl-N-(3-carboxypropyl)

amine

38252-74-3

N-Nitroso-n-butyl-N-(4-hydroxybutyl)

amine

3817-11-6

---

11

N-Nitrosodi-n—butylainine

924-16-3

N—Nitrosodiethanolamine

1116—54—7

N—Nitrosodiethylamine

55-18—5

N—Nitrosodimethylamine

62-75-9

N-Nitrosodiphenylamine

86-30-6

N-Nitrosodi—n-propylamine

621—64-7

N-Nitroso—N—ethylurea

759-73-9

3-(N-Nitrosomethylamino) propionitrile

60153—49-3

N-Nitrosomethylethylamine

10595-95-6

N-Nitroso—N-inethylurea

684-93-5

N-Nitrosomethylvinylamine

4549-40-0

N-Nitrosomorpholine

59-89-2

N—Nitrosonornicotine

16543—55—8

N-Nitrosopiperidine

100-75-4

N-Nitrosopyrrolidine

930-55-2

N-Nitrososarcosine

13256-22-9

Nitrofen

1836—75—5

Pentachloronitrobehzene

82-68-8

Pentachiorophenol

87-86-5

Peracetic acid

79—21—0

Phenol

108—95—2

Phenyihydrazine

100-63-0

Phorate

298-02-2

Phosphorus

7723-14-0

Phosphorus oxychloride

10025-87—3

Phosphorus

pentachioride

10026-13—8

Polybrominated

biphenyls

--

Polychlorinated

biphenyls

1336-36—3

Potassium bromate

7758-01—2

Propane

sultone

1120-71-4

beta-Propiolactone

57-57—8

Propyleneimine

75-55-8

Propylene

oxide

75-56-9

Pyrene

129—00—0

Quinoline

92—22—5

Selenium

7782—49—2

Sodium borate

1303—96-4

Styrene

100—42—5

Styrene oxide

96-09—3

Sulfallate

95—06—7

Sulfuric acid

7664—93—9

Terbufos

13071—79—9

1, i, 2, 2—Tetrachloroethane

79-34—3

Tetrachioroethylene

127—18—4

2,3,7, 8-Tetrachlorodibenzo-p-dioxin

1746-01-6

4,41—Thiodianiline

139—65—1

Thiophenol

108-98-5

Thiourea

62-56—6

Thorium

dioxide

1314-20—1

Toluene

108—88-3

Toluene—2

,

4—diisocyariate

584—84—9

Toluene-2

,

6—diisocyanate

91-08—7

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12

o-Toluidine

95—53—4

o—Toluidine hydrochloride

636—21—5

p—Toluidine

106—49—0

Toxaphene

8001—35—2

1,2,4—Trichlorobenzene

120—82—1

Trichloroethylene

79—01—6

2,4,6—Trichlorophenol

88-06—2

Trilnethyl

benzene

25551—13-7

1,2,4—Trimethyl benzene

95—63—6

2,4

,

6—Trinitrotoluene

118—96—7

Tris (2, 3-dibromopropyl)phosphate

126-72-7

Trypan blue

72-57-1

Urethane (Ethyl carbamate

51—79—6

Vinyl bromide

593—60-2

Vinyl chloride

75—01—4

Vinylidene chloride

75-35—4

Antimony compounds

Includes any

unique

chemical

substance that contains antimony

as part of that chemical’s infrastructure

Arsenic

compounds

Includes any

unique

chemical

substance that contains

arsenic as part of that chemical’s

infrastructure

Beryllium compounds

Includes any

unique

chemical

substance that contains

beryllium as part

of

that

chemicals infrastructure

Cadmium

compounds

Includes any unique chemical substance

that contains cadmium as part of that

chemical’s infrastructure

Chromium compounds

Includes any

unique

chemical

substance

that contains chromium as

part

of

that

chemical

‘

s

infrastructure

Cobalt compounds

Includes any

unique

chemical

substance

that contains cobalt as part of that

chemical‘s

infrastructure

Cyanide compounds

x(pos)

CN(neg)

where

X

=

H(pos)

or

any other group where a formal-dissociation

---

13

can be made.

For example, KCN or Ca(CN)2

Lead compounds

Includes any unique chemical substance

that contains lead as part of that

chemical

‘

s infrastructure

Manganese compounds

Includes any unique chemical substance

that contains manganese as part of that

chemical ‘s infrastructure

Mercury compounds

Includes any unique chemical substance

that contains mercury as part of that

chemical’s infrastructure

Nickel compounds

Includes any unique chemical substance

that contains nickel as part of that

chemical’ s infrastructure

IT IS SO ORDERED.

I, Dorothy N. Gunn,

Clerk of the Illinois Pollution Control.

Board, herepy certify thatthe above opinion and order was adopted

onthe,~Z--- day of

~-~--

,

1993,

by a vote of

Control Board