[Federal Register Volume 60, Number 112 (Monday, June 12, 1995)]
[Rules and Regulations]
[Pages 30926-30962]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-13787]



      

[[Page 30925]]

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Part II





Environmental Protection Agency





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40 CFR Parts 117, 302, and 355



Reportable Quantity Adjustments; Final Rule

  Federal Register / Vol. 60, No. 112 / Monday, June 12, 1995 / Rules 
and Regulations  
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[[Page 30926]] 


ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 117, 302, and 355

[SW H-FRL-5214-3]
RIN 2050-AD33


Reportable Quantity Adjustments

AGENCY: U.S. Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: The U.S. Environmental Protection Agency (EPA) today is taking 
final action on changes proposed on October 22, 1993 to reportable 
quantities (RQs) for hazardous substances under the Comprehensive 
Environmental Response, Compensation, and Liability Act. The person in 
charge of a facility or vessel from which a hazardous substance is 
released in excess of its RQs must notify appropriate authorities, who 
can then evaluate whether a response is needed. This rule revises the 
table of hazardous substances to add 47 individual Clean Air Act 
hazardous air pollutants; adjust their statutory one-pound RQs; add 
five other Clean Air Act hazardous air pollutants that are categories 
of substances and assign no RQ to the categories; and adjust RQs for 11 
Resource Conservation and Recovery Act hazardous wastes. EPA also is 
making conforming changes to the Clean Water Act table of hazardous 
substances and the Emergency Planning and Community Right-to-Know Act 
tables of extremely hazardous substances.
    EPA thoroughly evaluated the intrinsic properties of these 
substances to determine appropriate levels for the adjusted RQs; thus, 
this rule reflects a sound, scientific approach. The RQ adjustments are 
consistent with the Agency's common sense goals in that the rule will 
minimize net reporting and recordkeeping burdens. The rule results in 
an estimated net cost savings to industry and government of 
approximately $500,000 annually.

EFFECTIVE DATE: July 12, 1995.

ADDRESSES:
    Docket: Copies of materials relevant to this rulemaking are 
contained in the U.S. Environmental Protection Agency CERCLA Docket 
Office, Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, 
Arlington, VA 22202 [Docket Number 102 RQ-CAA]. The docket is available 
for inspection between the hours of 9 a.m. and 4 p.m., Monday through 
Friday, excluding Federal holidays. Appointments to review the docket 
can be made by calling 703/603-8917. The public may copy a maximum of 
266 pages from any regulatory docket at no cost. If the number of pages 
copied exceeds 266, however, an administrative fee of $25 and a charge 
of $0.15 per page for each page after page 266 will be incurred. The 
docket will mail copies of materials to requestors who are outside the 
Washington, DC metropolitan area.
    Release Notification: The toll-free telephone number of the 
National Response Center is 800/424-8802; in the Washington, DC 
metropolitan area, the number is 202/267-2675. The facsimile number for 
the National Response Center is 202/267-2165 and the telex number is 
892427.

FOR FURTHER INFORMATION CONTACT: The RCRA/UST, Superfund, and EPCRA 
Hotline at 800/424-9346 (in the Washington, DC metropolitan area, 
contact 703/412-9810). The Telecommunications Device for the Deaf (TDD) 
Hotline number is 800/553-7672 (in the Washington, DC metropolitan 
area, contact 703/486-3323); or Ms. Gerain H. Perry, Response Standards 
and Criteria Branch, Emergency Response Division (5202G), U.S. 
Environmental Protection Agency, 401 M Street SW., Washington, DC 
20460, or at 703/603-8760.

SUPPLEMENTARY INFORMATION: The contents of today's preamble are listed 
in the following outline:

I. Introduction
    A. Statutory Authority
    B. Background of this Rulemaking
    C. Reportable Quantity Adjustment Methodology
    D. Summary of Changes from the Proposed Rule
II. Response to Comments
    A. Support for Proposed RQ Adjustments
    1. Methylene Diphenyl Diisocyanate
    2. Ethylene Glycol
    B. Opposition to Proposed RQ Adjustments and/or Data
    1. Xylenes
    a. Aquatic Toxicity
    b. Application of BHP
    2. Dimethylformamide
    3. Titanium Tetrachloride
    4. Other Individual CAA Hazardous Air Pollutants
    a. Biphenyl
    b. 1,3-Butadiene
    c. Cresols
    d. Diethanolamine
    e. Ethylene Glycol
    5. K088
    6. F037 and F038
    C. Reporting Requirements for CAA Broad Generic Categories
    1. Options for Assigning RQs
    2. Definition and Scope of the Categories
    3. Other Issues
    D. Delisting Petition for Caprolactam
III. Changes to List of Hazardous Substances and Their RQs
IV. Changes to 40 CFR Parts 355 and 117
V. Regulatory Analyses
    A. Executive Order 12866
    B. Regulatory Flexibility Act
    C. Paperwork Reduction Act
    D. Unfunded Mandates

I. Introduction

A. Statutory Authority

    The Comprehensive Environmental Response, Compensation, and 
Liability Act of 1980 (CERCLA) (Pub. L. 96-510), 42 U.S.C. 9601 et 
seq., as amended, established broad Federal authority to respond to 
releases or threats of releases of hazardous substances from vessels 
and facilities. The term ``hazardous substance'' is defined in section 
101(14) of CERCLA chiefly by reference to various Federal environmental 
statutes. For example, the term includes ``any hazardous air pollutant 
listed under section 112 of the Clean Air Act'' (CAA), and ``any 
hazardous waste having the characteristics identified under or listed 
pursuant to section 3001 of the Solid Waste Disposal Act * * * ,'' also 
known as the Resource Conservation and Recovery Act (RCRA). Under 
CERCLA section 102(a), any substance that, when released into the 
environment, may present substantial danger to public health or welfare 
or the environment may be designated as a CERCLA hazardous substance.
    Section 102(b) of CERCLA establishes RQs for releases of CERCLA 
hazardous substances at one pound, unless a substance has a different 
RQ established under section 311(b)(4) of the Clean Water Act (CWA). 
Section 102(a) of CERCLA authorizes EPA to adjust these RQs by 
regulation.
    The person in charge of a vessel or facility from which a CERCLA 
hazardous substance has been released in a quantity that equals or 
exceeds its RQ must, under CERCLA section 103(a), immediately notify 
the National Response Center (see 40 CFR 302.6). The owner or operator 
of a facility from which an RQ or more of a CERCLA hazardous substance 
has been released must immediately notify State and local response 
authorities, as required by section 304 of the Emergency Planning and 
Community Right-to-Know Act of 1986 (EPCRA) (Pub. L. 99-499), 42 U.S.C. 
11001 et seq. (see 40 CFR 355.40).

B. Background of This Rulemaking

    The CERCLA list is being changed in today's final rule because: (1) 
Amendments to the CAA, signed into law on November 15, 1990 (Pub. L. 
101-549), incorporated additional substances into the CERCLA list; and 
(2) RCRA listing rules and the rule revising the RCRA toxicity 
characteristics also incorporated substances into the CERCLA list. 
[[Page 30927]] 
    Under section 112 of the CAA, as amended, 190 specific substances 
or broad generic categories of substances are listed as hazardous air 
pollutants; 52 of these (47 individual substances and five broad 
generic categories of substances) did not previously appear 
individually on the list of CERCLA hazardous substances at 40 CFR 
302.4. The substances not previously listed became hazardous substances 
pursuant to CERCLA section 101(14) upon enactment of the 1990 CAA 
Amendments and were assigned a one-pound statutory RQ under CERCLA 
section 102(b).
    In an October 22, 1993 Notice of Proposed Rulemaking (NPRM) (58 FR 
54836), EPA proposed to add the 47 hazardous air pollutants to the 
regulatory list of CERCLA hazardous substances at 40 CFR 302.4, and 
adjust their RQs. For the five CAA hazardous air pollutants that are 
broad generic categories, EPA requested public comment on five options 
for reporting that could potentially apply.1

    \1\  For a list of these options, see Section II.C.1 of today's 
preamble.
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    The October 22, 1993 NPRM also proposed to adjust the RQs for 
certain hazardous wastes listed under RCRA. In today's final rule, the 
Agency is adjusting the RQs for four hazardous wastes (F025, K088, 
K090, and K091) included in the October 22, 1993 NPRM from their 
statutory one-pound levels. As proposed in the October 22, 1993 NPRM, 
EPA is readjusting the RQs for five additional RCRA wastes (F004, D023, 
D024, D025, and D026) that already have been designated as hazardous 
and assigned adjusted RQs. RQ adjustments for the two remaining RCRA 
wastes that are included in this final rule, F037 and F038, were 
proposed prior to the October 22, 1993 NPRM. On March 27, 1991, EPA 
evaluated F037 and F038 under the RQ adjustment methodology and 
proposed one-pound adjusted RQs for these wastes (56 FR 12826); the 
Agency is promulgating the one-pound RQs for F037 and F038 in this 
final rule.

C. Reportable Quantity Adjustment Methodology

    In today's rule, EPA is promulgating adjusted RQs for the 
individual hazardous air pollutants based upon specific scientific and 
technical criteria that relate to the possibility of harm from the 
release of a CERCLA hazardous substance in certain amounts.2 EPA's 
methodology for adjusting the RQs of individual hazardous substances 
begins with an evaluation of the intrinsic physical, chemical, and 
toxicological properties of each hazardous substance. The intrinsic 
properties examined--called ``primary criteria''--are aquatic toxicity, 
mammalian toxicity (oral, dermal, and inhalation), ignitability, 
reactivity, chronic toxicity, and potential carcinogenicity.3

    \2\ See Section II.C.1 of this preamble for a discussion of RQ 
adjustments for the five broad generic categories.
    \3\ For further information on assigning adjusted RQs to 
hazardous substances under the primary criteria, see the Technical 
Background Document to Support Rulemaking Pursuant to CERCLA Section 
102, Volume 2, August 1986 (for chronic toxicity), Volume 3, July 
1989 (for potential carcinogenicity), and Volume 1, March 1985 (for 
the four other primary criteria), available for inspection at the 
CERCLA Docket Office, Crystal Gateway #1, 12th Floor, 1235 Jefferson 
Davis Highway, Arlington, VA 22202.
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    Generally, for each intrinsic property, EPA ranks hazardous 
substances on a scale, associating a specific range of values on each 
scale with an RQ value of 1, 10, 100, 1,000, or 5,000 pounds. The data 
for each hazardous substance are evaluated using various primary 
criteria; each hazardous substance may receive several tentative RQ 
values based on its particular intrinsic properties. The lowest of the 
tentative RQs becomes the ``primary criteria RQ'' for that substance.
    After the primary criteria RQs are assigned, substances are further 
evaluated for their susceptibility to certain degradative processes, 
which are used as secondary adjustment criteria.
    These natural degradative processes are biodegradation, hydrolysis, 
and photolysis (BHP).4 If a hazardous substance, when released 
into the environment, degrades relatively rapidly to a less hazardous 
form by one or more of the BHP processes, its RQ (as determined by the 
primary RQ adjustment criteria), is generally raised one level.5 
Conversely, if a hazardous substance degrades to a more hazardous 
product after its release, the original substance is assigned an RQ 
equal to the RQ for the more hazardous substance, which may be one or 
more levels lower than the RQ for the original substance.

    \4\ For further information on the methodology for applying BHP, 
see the Technical Background Document to Support Rulemaking Pursuant 
to CERCLA Section 102, Volume 1, March 1985, available for 
inspection at the CERCLA Docket Office, Crystal Gateway #1, 12th 
Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
    \5\ No RQ level increase based on BHP occurs if the primary 
criteria RQ is already at its highest possible level (100 pounds for 
potential carcinogens and 5,000 pounds for other types of hazardous 
substances). BHP is not applied to radionuclides.
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    EPA indicated in an August 30, 1989 proposed rule (54 FR 35988) 
that substances could be further evaluated by applying the methodology 
for developing threshold planning quantities (TPQs) pursuant to EPCRA 
section 302, but has not yet incorporated the TPQ methodology as part 
of the RQ adjustment methodology in any final rule.
    EPA currently is evaluating the RQ adjustment methodology to 
identify ways in which the methodology could be improved; for example, 
the Agency is considering whether the application of BHP to 
developmental toxicants should be limited. EPA is interested in 
receiving other suggestions for refining or improving the existing RQ 
adjustment methodology. It is important to note, however, that the 
Agency does not intend to formally respond as part of the rulemaking to 
suggestions provided by the public for changes to the RQ adjustment 
methodology.
D. Summary of Changes From the Proposed Rule

    EPA has made the following changes from the October 22, 1993 NPRM. 
Each change is discussed in the preamble section noted (if applicable).
     Six RCRA hazardous wastes (K119, K120, K121, U354, U355, 
and U357) with RQ adjustments proposed in the October 22, 1993 NPRM are 
not included in today's final rule. These six wastes are proposed, but 
not yet finalized, as RCRA hazardous wastes and, thus, are not yet 
CERCLA hazardous substances, as defined by CERCLA section 101(14)(C).
     The Agency is promulgating one-pound final RQs for two 
RCRA wastes, F037 and F038, that did not appear in the October 22, 1993 
NPRM (see Section II.B.6).
     In the October 22, 1993 NPRM, EPA proposed to add m-
xylene, one of the 47 hazardous air pollutants, to Table 302.4 and to 
adjust its statutory one-pound RQ to 100 pounds. After reviewing data 
recently submitted by the commenters, however, EPA has decided to 
promulgate a 1,000-pound final RQ for m-xylene (see Section II.B.1).
     The Agency also proposed in the October 22, 1993 NPRM to 
add dimethylformamide, another hazardous air pollutant, to Table 302.4 
and to adjust its statutory one-pound RQ to 10 pounds. After evaluating 
data submitted by the commenters, the Agency has decided in this final 
rule to promulgate a 100-pound final RQ for dimethylformamide (see 
Section II.B.2).
     Similarly, after reviewing comments submitted on the 100-
pound RQ proposed for titanium tetrachloride in the October 22, 1993 
NPRM, the Agency has decided to promulgate a 1,000-pound RQ for this 
substance in today's final rule (see Section II.B.3).
     EPA requested public comments on five options for 
assigning RQs to the [[Page 30928]] CAA broad generic categories in the 
October 22, 1993 NPRM. In today's final rule, EPA is promulgating one 
of the scenarios described in Option 5, namely, the Agency is assigning 
no RQs to the categories, but will evaluate certain substances within 
the categories to determine whether they should be individually listed 
in Table 302.4 of 40 CFR 302.4, and be assigned RQs (see Section 
II.C.1).

II. Response to Comments

A. Support for Proposed RQ Adjustments

1. Methylene Diphenyl Diisocyanate
    The proposed RQ adjustment for methylene diphenyl diisocyanate 
(MDI) from the statutory one-pound level to 5,000 pounds was supported 
by all of the 84 commenters who submitted comments regarding this 
substance.6 The Agency agrees with commenters that the 5,000-pound 
adjusted RQ for MDI will reduce the number of reports of releases that 
are unlikely to pose a threat to public health or welfare or the 
environment, thereby reducing the reporting burden on industry and 
allowing EPA to focus its resources on those releases that are more 
likely to pose such threats.

    \6\ Detailed responses to these comments on MDI are included in 
Section I.A of the responses to comments document for this 
rulemaking, available for inspection at the CERCLA Docket Office, 
Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, 
Arlington, VA 22202.
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    The Agency is continuing to evaluate data on the chronic toxicity 
and potential carcinogenicity of MDI, as well as the potential 
carcinogenicity of p-phenylenediamine, another hazardous air pollutant 
included in today's final rule. Because these evaluations have not been 
completed, EPA is promulgating a 5,000-pound RQ for both MDI and p-
phenylenediamine in today's final rule, as proposed. If, however, as a 
result of the potential carcinogenicity and chronic toxicity 
evaluations, the Agency determines that a change in the 5,000-pound RQ 
for either of these substances is warranted, EPA will propose to 
readjust the RQ for MDI and/or p-phenylenediamine in a separate 
rulemaking.
2. Ethylene Glycol
    The proposed adjustment of the RQ for ethylene glycol from the 
statutory one-pound level to 5,000 pounds was supported by 75 of the 76 
commenters who submitted comments on this substance.7 It is 
important to note, however, that releases of ethylene glycol equal to 
or exceeding 5,000 pounds during a 24-hour period (e.g., from airplane 
de-icing operations) are reportable under CERCLA. If such a release is 
not federally permitted and, thus, is not exempt from CERCLA reporting 
and liability provisions, notification to the NRC under CERCLA and to 
the appropriate State emergency response commissions (SERCs) and local 
emergency planning committees (LEPCs) under EPCRA is required. The 
Agency anticipated that releases in excess of 5,000 pounds may occur 
and noted in the preamble to the October 22, 1993 NPRM that releases of 
ethylene glycol in de-icing operations equal to or exceeding the 5,000-
pound RQ may qualify for reduced reporting as ``continuous releases.'' 
8

    \7\ Detailed responses to these comments on ethylene glycol are 
included in Section I.B of the responses to comments document for 
this rulemaking, available at the CERCLA Docket Office, Crystal 
Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, Arlington, VA 
22202.
    \8\ In addition to MDI and ethylene glycol, the Agency received 
a number of comments in support of RQs proposed for other individual 
hazardous air pollutants. Detailed responses to these comments are 
included in Section I.C of the responses to comments document for 
this rulemaking, available at the CERCLA Docket Office, Crystal 
Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, Arlington, VA 
22202.
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B. Opposition to Proposed RQ Adjustments

1. Xylenes
    In addition to RQ adjustments for the 47 individual CAA hazardous 
air pollutants, EPA also proposed an RQ adjustment for the hazardous 
substance category, ``xylene (mixed).'' This category is already listed 
in Table 302.4 as a CERCLA hazardous substance and represents a mixture 
of the three xylene isomers, m-xylene, o-xylene, and p-xylene, in any 
proportion. In 1990, the CAA Amendments added the three xylene isomers 
individually to the CAA section 112 list of hazardous air pollutants. 
In today's final rule, EPA is adding these three isomers as three 
separate entries in the 40 CFR 302.4 list of CERCLA hazardous 
substances.
    In the October 22, 1993 NPRM, the Agency proposed to adjust the RQs 
for m-xylene and p-xylene to 100 pounds, and the RQ for o-xylene to 
1,000 pounds. Because there are three substances within the xylenes 
category and EPA had sufficient data to assign RQs to each of these 
substances, the Agency also proposed to assign the lowest RQ of the 
individual member substances to the category. Specifically, EPA 
proposed to adjust the RQ for the ``xylene (mixed)'' category from 
1,000 pounds to 100 pounds to be consistent with the data used to 
develop the 100-pound proposed RQs for the m- and p-xylene isomers. In 
today's final rule, the Agency is promulgating the 100-pound proposed 
RQ for ``xylene (mixed),'' as described below in Section II.B.1.a of 
the preamble.
    It is important to note that the preceding paragraph only describes 
the Agency's adjustment of the RQ for the ``xylenes (mixed)'' category. 
This discussion does not address whether particular releases of mixed 
xylenes are reportable under various scenarios. The person in charge of 
a facility from which a release of mixed xylenes occurs should apply 
the mixture rule (as described in Section II.B.6 of today's preamble) 
on a case-by-case basis to determine if a particular release of mixed 
xylenes must be reported under CERCLA section 103 and EPCRA section 
304. Essentially, the Agency's mixture rule provides that, if the 
quantity of each of the xylene isomers in a particular mixture of 
xylenes is known (and there are no other hazardous constituents in the 
xylenes mixture), reporting is required only when an RQ or more of m-, 
o-, or p-xylene is released. If, however, the quantity of one or more 
of the xylene isomers is unknown, reporting is required when 100 pounds 
or more of the total mixture of xylenes is released.
    a. Aquatic Toxicity. Nine commenters favored promulgation of 1,000-
pound adjusted RQs for m- and p-xylene and for the ``xylene (mixed)'' 
category, rather than the 100-pound RQs proposed for these substances. 
Six of the nine commenters asserted that the Agency had incorrectly 
assigned 100-pound primary criteria RQs to these substances. As 
correctly noted by these commenters, the 100-pound RQ adjustments 
proposed for m- and p-xylene were based on studies of fish species 
other than the standard species (i.e., fathead minnow or bluegill) 
preferred for assigning RQs based on aquatic toxicity. As stated in 
previous technical background documents to support RQ adjustment 
rulemakings, aquatic toxicity studies from other fish species may be 
used by the Agency to establish RQs when data on standard species are 
not available.
    Several commenters performed and submitted additional studies 
(Springborn Laboratories (1994a and 1994b)) 9 on the aquatic 
toxicity of m- [[Page 30929]] and p-xylene using standard species. EPA 
has reviewed these and other standard species studies (Geiger et al. 
(1986, 1990)) 10 submitted by the commenters on the xylene 
isomers.

    \9\ Machado, M. 1994a. para-Xylene - Acute Toxicity to Fathead 
Minnow (Pimephales promelas) Under Flow-Through Conditions. 
Springborn Laboratories, Wareham, Massachusetts; and Machado, M. 
1994b. meta-Xylene--Acute Toicity to Fathead Minnow (Pimephales 
promelas) Under Flow-Through Conditions. Springborn Laboratories, 
Wareham, Massachusetts.
    \10\  Geiger, D.L., S.H. Poirier, L.T. Brooke, D.J. Call, Eds. 
1986. Acute Toxicities of Organic Chemicals to Fathead Minnows 
(Pimephales promelas). Vol III, Center for Lake Superior 
Environmental Studies, University of Wisconsin-Superior; and Geiger, 
D.L., S.H. Poirier, L.T. Brooke, D.J. Call, Eds. 1990. Acute 
Toxicities of Organic Chemicals to Fathead Minnows (Pimephales 
promelas). Vol V, Center for Lake Superior Environmental Studies, 
University of Wisconsin-Superior.
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    Fathead minnow data on m-xylene in both the Geiger et al. (1990) 
and Springborn Laboratories (1994b) studies support the assignment of a 
1,000-pound RQ for this substance.11 In today's final rule, 
therefore, EPA is not promulgating the 100-pound RQ for m-xylene as 
proposed; rather, the Agency is promulgating a 1,000-pound RQ for this 
substance based, in part, on the aquatic toxicity data reported in 
Geiger et al. (1990) and Springborn Laboratories (1994b). (Chronic 
toxicity and ignitability data also support a 1,000-pound RQ for m-
xylene.)

    \11\ For a detailed discussion of the studies on m-xylene, see 
Response Numbers II.A.3 and II.A.6 in Section II of the responses to 
comments document for this rulemaking, available for inspection at 
the CERCLA Docket Office, Crystal Gateway #1, 12th Floor, 1235 
Jefferson Davis Highway, Arlington, VA 22202.
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    Fathead minnow data on p-xylene, however, as reported in both the 
Geiger et al. (1986) and Springborn Laboratories (1994a) studies, 
support the 100-pound RQ proposed for p-xylene in the October 22, 1993 
proposed rule.12 Therefore, EPA is finalizing a 100-pound adjusted 
RQ for p-xylene based on the standard aquatic toxicity data provided in 
Geiger et al. (1986) and Springborn Laboratories (1994a), and supported 
by the non-standard aquatic toxicity data used by EPA in the October 
22, 1993 NPRM as the basis for the 100-pound RQ proposed for this 
substance.

    \12\  The Agency disagrees with one commenter's assertion that 
data from Geiger et al. (1986) are unacceptable because of certain 
deviations from standard test conditions. For a detailed discussion 
of the studies on p-xylene, see Response Numbers II.A.3, II.A.4, and 
II.A.5 in Section II of the responses to comments document for this 
rulemaking, available for inspection at the CERCLA Docket Office, 
Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, 
Arlington, VA 22202.
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    With regard to the comments recommending a 1,000-pound RQ for the 
``xylenes (mixed)'' category, although EPA appreciates the aquatic 
toxicity data provided by the commenters, the Agency is not using these 
data to determine an RQ for this hazardous substance category in the 
final rule. As noted previously, because there are three xylene isomers 
within the ``xylenes (mixed)'' category and EPA has sufficient data to 
assign RQs to each of these three substances, the Agency is assigning 
the lowest RQ of the individual member substances to the category. 
Thus, EPA is readjusting the 1,000-pound RQ for xylenes (mixed) to 100 
pounds, as proposed, to be consistent with the 100-pound RQ for one of 
its member substances, p-xylene. Assigning a 100-pound RQ to the 
``xylenes (mixed)'' category is consistent with other instances (e.g., 
cyanides) in which the Agency has assigned the lowest RQ of the 
individual member substances to a hazardous substance category, because 
the category contains only a limited number of substances and EPA has 
sufficient data to assign RQs to all of these substances in the 
category.
    b. Application of BHP. Eight commenters contended that EPA did not 
properly evaluate xylenes for their susceptibility to degradation in 
the environment in proposing adjusted RQs for these substances in the 
October 22, 1993 NPRM. The Agency disagrees. EPA conducted a 
comprehensive search for data on both the primary RQ adjustment 
criteria and the secondary criteria of BHP, and was unable to locate 
any convincing degradation data indicating that application of BHP to 
raise the RQs of xylenes was warranted.\13\ In addition, EPA applies 
the secondary RQ adjustment criteria of BHP to raise the RQ of a 
hazardous substance only when the reaction products are less hazardous 
than the parent substance. Data submitted on the xylenes indicate that 
the degradation products of xylenes in the atmosphere include 2,4-
dimethylphenol and formaldehyde, each of which is a CERCLA hazardous 
substance with a 100-pound RQ. Because the RQs of these two degradative 
products are 100 pounds, application of the secondary criteria of BHP 
to the xylenes could not be used to raise the 1,000-pound RQs for m- 
and o-xylene or the 100-pound RQs for p-xylene and xylenes (mixed).

    \13\ For detailed responses to comments regarding the 
degradation of xylenes and application of BHP to these substances, 
see Response Numbers II.A.10 and II.A.11 in Section II of the 
responses to comments document for this rulemaking, available for 
inspection at the CERCLA Docket Office, Crystal Gateway #1, 12th 
Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
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2. Dimethylformamide
    One commenter opposed the 10-pound RQ proposed for 
dimethylformamide and asserted that a 100-pound RQ is more appropriate 
for this substance. To support this assertion, the commenter submitted 
data from a number of epidemiology and animal toxicity studies the 
commenter had used to challenge the Agency's classification of 
dimethylformamide as a probable human carcinogen. As the commenter 
correctly noted, the Agency proposed in the October 22, 1993 NPRM to 
adjust the RQ for dimethylformamide to 10 pounds, based on an 
evaluation of its potential carcinogenicity. Based on data reviewed at 
that time indicating limited evidence of carcinogenic effects in humans 
and inadequate evidence in animals, EPA classified dimethylformamide as 
a weight-of-evidence Group B1, probable human carcinogen. Combining 
this weight-of-evidence classification with a potency Group 2 
classification resulted in a hazard ranking of ``medium'' and a 
proposed adjusted RQ of 10 pounds.
    Since publication of the October 22, 1993 NPRM, however, the Agency 
has completed its own internal review of data on the potential 
carcinogenicity of dimethylformamide, including relevant data submitted 
by the commenter. As a result of this review, EPA agrees with the 
commenter that the weight of evidence is not currently sufficient to 
classify dimethylformamide as a Group B1, probable human carcinogen. 
For this reason, EPA has not relied on the potential carcinogenicity 
criterion as a basis for the RQ adjustment for dimethylformamide; 
rather, in today's final rule, the Agency is promulgating a 100-pound 
RQ for this substance based on chronic toxicity.
3. Titanium Tetrachloride
    Two commenters asserted that a 1,000-pound primary criteria RQ is 
scientifically justified for titanium tetrachloride based on toxicity 
and, thus, more appropriate than the 100-pound RQ proposed for this 
substance. Although EPA continues to believe that a primary criteria RQ 
of 100 pounds is warranted for titanium tetrachloride,\14\ the Agency 
has decided to promulgate an adjusted RQ of 1,000 pounds for this 
substance based on a re-evaluation of titanium tetrachloride under the 
secondary RQ adjustment criterion of hydrolysis. As noted in Section 
II.B.1.b of this preamble, one-level upward RQ adjustments based on 
hydrolysis are warranted only when the secondary products of the 
reaction are less toxic than the parent compound. The most prevalent 
secondary product of the titanium tetrachloride hydrolysis reaction is 
hydrochloric acid (or [[Page 30930]] hydrogen chloride gas), which is a 
CERCLA hazardous substance with a 5,000-pound RQ. In an August 30, 1989 
rule (54 FR 35988), the Agency proposed to adjust the 5,000-pound RQ 
for hydrochloric acid to 100 pounds, based on application of the TPQ 
methodology (see Section I.C of today's preamble) as part of the RQ 
adjustment methodology. Because the proposed 100-pound RQ for 
hydrochloric acid (the reaction product) from the 1989 rule was no 
higher than the 100-pound primary criteria RQ for titanium 
tetrachloride (the parent compound), the Agency did not apply the 
secondary RQ adjustment criteria to raise the RQ for titanium 
tetrachloride in the October 22, 1993 NPRM.

    \14\ For further discussion of the chronic toxicity primary 
criterion RQ for titanium tetrachloride, see Response Number II.B.17 
in Section II of the responses to comments document for this 
rulemaking, available for inspection at the CERCLA Docket Office, 
Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, 
Arlington, VA 22202.
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    As of today's final rule, however, EPA has not yet promulgated the 
100-pound RQ for hydrochloric acid that was proposed in the August 30, 
1989 rule and has not yet included the TPQ methodology as part of the 
RQ adjustment methodology in any final rule; thus, the current 5,000-
pound RQ for hydrochloric acid still applies. This 5,000-pound RQ for 
hydrochloric acid is higher than the 100-pound RQ for titanium 
tetrachloride (i.e., the secondary product of the hydrolysis reaction 
is less toxic than the parent compound). Therefore, the Agency is 
applying the secondary RQ adjustment criterion of hydrolysis in today's 
final rule to raise the 100-pound primary criteria RQ for titanium 
tetrachloride one level to 1,000 pounds.\15\

    \15\ If EPA incorporates the TPQ methodology as part of the RQ 
adjustment methodology and adjusts the RQ for hydrochloric acid in a 
final rule, the RQ for titanium tetrachloride will be readjusted 
accordingly.
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4. Other Individual CAA Hazardous Air Pollutants
    a. Biphenyl. Four commenters supported a 1,000-pound adjusted RQ 
for biphenyl, rather than the 100-pound RQ adjustment proposed in the 
October 22, 1993 NPRM. One of these commenters submitted data on the 
biodegradation of biphenyl and concluded that these data support a 
1,000-pound RQ. After reviewing the data submitted by this commenter, 
the Agency disagrees with the commenter's conclusions. The data on 
biphenyl provided by the commenter do not meet several conditions 
necessary for adjustment based on biodegradation, including: (1) The 
substance must have a five-day biochemical oxygen demand (BOD5) 
equal to or greater than 50% in ``unadapted'' media, which have not 
been previously exposed to the substance; and (2) the substance must be 
in a form that is available to microorganisms responsible for 
biodegradation.\16\ Therefore, the Agency is promulgating an adjusted 
RQ of 100 pounds for biphenyl based on the chronic toxicity criterion, 
with no upward adjustment based on BHP.

    \16\ For detailed responses to comments on the biodegradation of 
biphenyl, see Response Numbers II.B.4 and II.B.5 in Section II of 
the responses to comments document for this rulemaking, available 
for inspection at the CERCLA Docket Office, Crystal Gateway #1, 12th 
Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
    b. 1,3-Butadiene. Two commenters opposed the 10-pound proposed RQ 
for 1,3-butadiene. These commenters submitted potential carcinogenicity 
data to support the assertion that the potency factor calculated for 
1,3-butadiene by the Agency in the proposed rule was ``at least an 
order of magnitude too high.'' According to the commenters, the Agency 
should recalculate a more accurate (and lower) value for the potency of 
1,3-butadiene and should promulgate a 100-pound RQ for this substance, 
rather than the 10-pound proposed RQ.
    Pending completion of its review of new epidemiology data on 1,3-
butadiene submitted by the commenters, as well as data on the 
appropriate model for conducting quantitative risk assessments on this 
substance, the Agency will retain its current estimates, including a 
potency factor calculation of 8.4 (mg/kg/day)-1 for RQ adjustment 
purposes.\17\ This potency factor, coupled with a weight-of-evidence 
Group B2 classification, results in a final RQ of 10 pounds for 1,3-
butadiene in today's final rule. EPA is continuing its comprehensive 
review of the potential carcinogenicity data on 1,3-butadiene to 
determine if a change in the Agency's potency factor estimate is 
necessary. The Agency will readjust the RQ for 1,3-butadiene in a 
separate rulemaking if its review results in an RQ other than 10 pounds 
for this substance.

    \17\ For detailed responses to comments on the potential 
carcinogenicity of 1,3-butadiene, and EPA's basis for using its 
current estimates to adjust the RQ for this substance, see Response 
Numbers II.B.7 and II.B.8 in the responses to comments document for 
this rulemaking, available for inspection at the CERCLA Docket 
Office, Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis 
Highway, Arlington, VA 22202.
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    c. Cresols. The Agency also proposed in the October 22, 1993 NPRM 
to adjust the RQ for another hazardous substance category, 
``cresol(s),'' which, similar to ``xylene (mixed),'' is already listed 
in Table 302.4. This listing for the hazardous substance cresols 
represents a mixture of the three cresol isomers (m-cresol, o-cresol, 
and p-cresol) in any proportion. In 1990, the CAA Amendments added the 
three cresol isomers individually to the CAA section 112 list of 
hazardous air pollutants. In today's final rule, EPA is adding these 
three isomers as three separate entries in the 40 CFR 302.4 list of 
CERCLA hazardous substances.
    In the October 22, 1993 NPRM, the Agency proposed adjustments to 
the statutory one-pound RQs for the three cresol isomers. EPA proposed 
to adjust each of the RQs for m-, o-, and p-cresol to 100 pounds based 
on studies published since the final rule designating the category 
cresols as a hazardous substance and assigning it a 1,000-pound RQ (see 
51 FR 34561, September 29, 1986). Because there are three substances 
within the cresols category and EPA had sufficient data to assign 100-
pound RQs to each of these substances, the Agency proposed to adjust 
the RQ for the ``cresol(s)'' category from 1,000 pounds to 100 pounds 
to be consistent with the data used to develop the 100-pound RQs for 
the m-, o-, and p-cresol isomers.
    One commenter opposed the 100-pound RQ for the cresol isomers and 
asserted that the recent reclassification of cresols in the IRIS data 
base as a weight-of-evidence Group C, possible human carcinogen, was 
based on studies of doubtful validity. Based on data submitted to 
support its assertion, the commenter requested that EPA retain the 
1,000-pound RQ for cresols, pending the outcome of EPA's decision on 
this matter.
    EPA disagrees with the commenter that the 1,000-pound RQ for 
cresols should be retained. Hazardous substances are classified in 
weight-of-evidence Group C when the Agency determines that there is 
``limited'' evidence of carcinogenicity in animals, in the absence of 
human data. According to EPA guidelines,\18\ limited evidence of 
carcinogenicity in animals can be indicated by a wide variety of 
effects, including: (1) Malignant tumor responses in a single, well-
conducted experiment that does not meet conditions for ``sufficient'' 
evidence; (2) tumor responses of marginal statistical significance in 
studies having inadequate design or reporting; (3) benign tumors 
(without malignant tumors) from an agent showing no response in a 
variety of short-term tests for mutagenicity; and (4) responses of 
marginal statistical significance in a tissue known to have a high or 
variable background rate of cancer.

    \18\ U.S. EPA 1988. Methodology for Evaluating Potential 
Carcinogenicity in Support of Reportable Quantity Adjustments 
Pursuant to CERCLA Section 102. Office of Health and Environmental 
Assessment, Washington, DC.
---------------------------------------------------------------------------

    EPA has carefully reviewed the data submitted by the commenter. As 
a result [[Page 30931]] of this review, EPA has decided to retain its 
classification of each of the cresol isomers (m-, o-, and p-cresol) in 
weight-of-evidence Group C, possible human carcinogen. The deficiencies 
noted by the commenter regarding the in vitro and in vivo studies 
relied on by the Agency are reasons for the Agency's decision not to 
classify the evidence of carcinogenicity as ``sufficient.''\19\ 
Reviewed together, however, these studies do provide limited evidence 
of animal carcinogenicity and, thus, justify classification of the 
cresol isomers in weight-of-evidence Group C. The Agency, therefore, 
will retain its original decision to adjust the RQ for cresols from 
1,000 to 100 pounds, and to establish final RQs of 100 pounds for each 
of the cresol isomers.\20\

    \19\ For further information on the data and findings of the in 
vitro and in vivo studies, see Section 3 of the Technical Background 
Document to Support Rulemaking Pursuant to CERCLA Section 102, 
Volume 7, available for inspection as part of the public docket for 
this rulemaking at the CERCLA Docket Office, Crystal Gateway #1, 
12th Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
    \20\ For detailed responses to the comments on the 
carcinogenicity of cresols, see Response Numbers II.B.10 and II.B.11 
in Section II of the responses to comments document for this 
rulemaking, available for inspection at the CERCLA Docket Office, 
Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, 
Arlington, VA 22202.
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    d. Diethanolamine. Three commenters opposed the 100-pound proposed 
RQ for diethanolamine based on the chronic toxicity criterion. The 
commenters asserted that a primary criteria RQ of 1,000 pounds is more 
appropriate for this substance, and that application of the secondary 
RQ adjustment criterion of biodegradation should be applied to raise 
the final RQ to 5,000 pounds.
    Under the methodology for developing primary criterion RQs based on 
chronic toxicity, a substance is first assigned two rating values, one 
based on the dose that causes a particular effect, and one based on the 
severity of the effect. The dose rating value (RVd) ranges from 
one to 10, with 10 representing the most toxic substances. The effect 
rating value (RVe) also ranges from one to 10, with 10 
representing the most severe effect. The product of the RVd and 
RVe for a substance yields a composite score between one and 100. 
Tentative chronic toxicity RQs are then assigned on the basis of the 
composite score.\21\

    \21\ For further information on the relationship of composite 
scores to tentative chronic toxicity RQs, see the Technical 
Background Document to Support Rulemaking Pursuant to CERCLA Section 
102, Volume 2, available for inspection as part of the public docket 
for this rulemaking at the CERCLA Docket Office, Crystal Gateway #1, 
12th Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
    Because no chronic toxicity studies have been reported for 
diethanolamine, both EPA and the commenters used data from a 13-week 
subchronic study (Melnick (1992) 22 to develop their respective 
conclusions. Based on a different interpretation of these same data, 
the commenters supported use of an RVe of 5, rather than the 
RVe of 7 used by EPA to assign a 100-pound primary criterion RQ 
for diethanolamine. The commenters generally agreed with the Agency on 
an RVd of 3.8 for the substance.

    \22\ Melnick, R.L., 1992. NTP Technical Report on the Toxicity 
Studies of Diethanolamine (CAS No. 111-42-2) Administered Topically 
and in Drinking Water to F344/N Rats and B6C3F1 Mice. National 
Toxicology Program. NIH Publication No. 92-3343.
---------------------------------------------------------------------------

    In supporting an RVe of 5 for diethanolamine, one of the 
commenters asserted that increased blood urea nitrogen (BUN) is 
incorrectly listed as an effect and that reported kidney changes do not 
identify impairment of kidney function. EPA disagrees; upward trends in 
relative kidney weight and BUN have been observed together, suggesting 
that kidney function (i.e., removal of excess urea) in the exposed 
animals is impaired, resulting in increased kidney weight. The Agency, 
therefore, considers it appropriate to place diethanolamine in RVe 
category 7 because of the observed ``necrosis * * * with a detectable 
decrement of organ function.'' This results in a composite score of 
26.6 (i.e., 3.8 RVd x 7 RVe) and a corresponding chronic 
toxicity primary criterion RQ of 100 pounds.
    This commenter also supported raising the primary criterion RQ for 
diethanolamine one level, based on the secondary criterion of 
biodegradation. Two (Bridie et al. (1979) and Gannon et al. (1978)) 
23 of the eight studies submitted by the commenter on the 
biodegradation of diethanolamine reported BOD5 values equal to or 
greater than the standard for upward RQ adjustment on the basis of 
biodegradation. These experiments, however, were conducted using 
``adapted'' sewage sludge (see previous discussion on biphenyl), rather 
than under conditions normally found in the environment. One (Bridie et 
al. (1979)) of these two studies also evaluated diethanolamine using 
unadapted sewage sludge, but the result was a BOD5 of only two 
percent.

    \23\ Bridie, A.L. et al., 1979. Biochemical Oxygen Demand and 
Chemical Oxygen Demand of Some Petrochemicals. Water Research 
13:627-30; and Gannon, J.E. et al., 1978. Microbial Degradation of 
Diethanolamine and Related Compounds. Microbios. 23:7-18.
---------------------------------------------------------------------------

    Because the data provided by the commenter do not justify 
application of the secondary RQ adjustment criterion of biodegradation 
to diethanolamine, the Agency has promulgated a final RQ of 100 pounds 
(as proposed) based on chronic toxicity.
    e. Ethylene Glycol. One commenter stated that, based on the 
incidence of pet and wildlife poisonings due to ingestion of ethylene 
glycol antifreeze, the 5,000-pound proposed RQ for ethylene glycol is 
inappropriate. The commenter asserted that, by raising the RQ to 5,000 
pounds, EPA would be sending the false message that ethylene glycol is 
not dangerous. According to the commenter, such a message would result 
in reduced attention to all but the largest releases of this substance. 
For this reason, the commenter urges EPA to retain a one-pound RQ for 
ethylene glycol.
    While EPA shares the concerns expressed by the commenter regarding 
acute exposures to ethylene glycol, the Agency believes that a lower RQ 
for ethylene glycol would not necessarily prevent accidental poisonings 
to humans, pets, and wildlife. RQs under CERCLA serve only to notify 
the Federal, State, and local governments of the release so that 
authorities can determine whether a response is necessary under the 
particular circumstances of the release.
    In addition, the technical data supplied by the commenter do not 
support assignment of an RQ for ethylene glycol below 5,000 pounds. 
Under EPA's RQ adjustment methodology, an acute mammalian toxicity RQ 
for oral exposure to a hazardous substance (e.g., ethylene glycol) is 
determined based on the dose that is lethal to 50 percent of the animal 
population tested (known as the LD50 value). For the oral exposure 
route, LD50s of between 100 and 499 milligrams per kilogram (mg/
kg) define the range that results in a 5,000-pound RQ based on acute 
mammalian toxicity. LD50 values above 499 mg/kg also result in RQs 
at the maximum 5,000-pound level; LD50s below 100 mg/kg result in 
RQs between one and 1,000 pounds.
    The commenter supplied several pieces of information to support the 
position that ethylene glycol should be assigned a one-pound RQ. This 
information included studies on the toxicity of ethylene glycol, a 
table showing regulation of ethylene glycol under Federal environmental 
statutes (e.g., the CAA and CERCLA), and newspaper articles describing 
accidental poisonings. EPA has carefully reviewed these materials. None 
of the data submitted by the commenter support an RQ of one-pound; in 
fact, all of these data are well above the upper bound of the range of 
acute mammalian toxicity [[Page 30932]] data (499 mg/kg) that define a 
5,000-pound RQ.24

    \24\ For a detailed response to this comment on ethylene glycol, 
see Response Number II.B.16 in Section II of the responses to 
comments document for this rulemaking, available for inspection at 
the CERCLA Docket Office, Crystal Gateway #1, 12th Floor, 1235 
Jefferson Davis Highway, Arlington, VA 22202.
---------------------------------------------------------------------------

    The commenter also provided a table showing that ethylene glycol, 
unlike propylene glycol, is regulated under various environmental 
statutes. The commenter appears to be using the table to suggest that 
ethylene glycol is the more toxic of the two substances. Regardless of 
whether this assertion is correct, listing of ethylene glycol (i.e., 
under the CAA and CERCLA) indicates only that an RQ must be assigned to 
this CERCLA hazardous substance, but does not provide the technical 
data needed to support a particular RQ. The newspaper articles 
submitted by the commenter do not provide any data that can be used to 
adjust the RQ for ethylene glycol.
    As noted above, all of the data from the studies submitted by the 
commenter are above the range of acute mammalian toxicity data that 
result in a 5,000-pound RQ. In fact, EPA has assigned a lower primary 
criteria RQ based on chronic toxicity (1,000 pounds) than indicated 
based on mammalian toxicity (5,000 pounds). The Agency then applied the 
secondary RQ adjustment criteria of BHP, which resulted in an upward 
adjustment of the 1,000-pound chronic toxicity RQ to 5,000 pounds based 
on ethylene glycol's susceptibility to biodegradation in the 
environment.
    Thus, EPA does not have sufficient technical justification to 
establish a one-pound adjusted RQ for ethylene glycol, as requested by 
the commenter. Nevertheless, the Agency encourages users of ethylene 
glycol to exercise greater precautions to help prevent accidental 
poisonings. In addition, EPA would like to clarify that the 5,000-pound 
final RQ for ethylene glycol should not be interpreted as a 
determination that smaller releases are safe under all possible release 
scenarios.
5. K088
    To assign an RQ to a hazardous waste stream, the Agency first 
identifies the substances that are constituents of the waste stream (as 
listed in 40 CFR part 261, Appendix VII) and determines the RQs for 
these constituents. The lowest of the constituent RQs becomes the RQ 
for the waste stream. In the case of spent potliner wastes (K088), the 
only hazardous constituent is cyanide, which is a CERCLA hazardous 
substance with a final RQ of 10 pounds (50 FR 13456, April 4, 1985). 
For this reason, EPA proposed an RQ of 10 pounds for waste stream K088 
in the October 22, 1993 NPRM.
    One commenter requested that the proposed 10-pound RQ for K088 be 
raised to 1,000 pounds based on the cyanide content of this waste 
stream. The Agency notes, however, that the RQ adjustment methodology 
does not consider the ``content'' or concentration of a constituent in 
the waste stream in determining an RQ for that waste stream. Therefore, 
EPA is promulgating a 10-pound RQ for K088 in today's final rule.
6. F037 and F038
    As noted in Section I.B., the Agency has decided to promulgate 
final RQs for two hazardous waste streams (F037 and F038) for which RQs 
were proposed on March 27, 1991 (56 FR 12862). For this reason, EPA is 
addressing the two comments submitted on this previous proposal in 
today's final rule.
    The two commenters supported EPA's methodology of applying the 
Agency's ``mixture rule'' in determining whether CERCLA notification 
for F037 and F038 is required, but opposed an RQ of one pound for F037 
and F038 when constituent quantities of the waste are unknown.
    Under the mixture rule, as set forth in 40 CFR 302.6(b), if the 
quantity of each of the constituents of a waste is known, reporting is 
required only when an RQ or more of any of the individual hazardous 
constituents is released. Knowledge that the average quantities of 
hazardous constituents in several waste streams with the same 
identification number (e.g., F037) are below their respective hazardous 
constituent RQs is not a sufficient basis for applying this provision 
of the mixture rule to all waste streams with that identification 
number.
    The Agency's mixture rule also provides that, if the quantity of 
one or more of the hazardous constituents is unknown, reporting is 
required when an RQ or more of the waste itself is released. Thus, if 
the quantity of one or more of the constituents of F037 or F038 was 
unknown, reporting would be required when the amount of the waste 
stream released is one pound or more.
    EPA believes that the one-pound adjusted RQs for waste streams F037 
and F038 are necessary to fulfill the Agency's CERCLA mandate to 
protect public health and welfare and the environment from releases of 
these waste streams that may contain concentrations of hazardous 
constituents greater than those considered ``typical'' by the 
commenter.25

    \25\ For a detailed discussion of these responses to comments on 
F037 and F038, see Response Numbers V.1 and V.2 in Section V of the 
responses to comments document for this rulemaking, available for 
inspection at the CERCLA Docket Office, Crystal Gateway #1, 12th 
Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
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C. Reporting Requirements for CAA Broad Generic Categories

1. Options for Assigning RQs
    Of the broad generic categories of chemicals listed as hazardous 
air pollutants by the CAA Amendments, five categories--cobalt 
compounds, glycol ethers, manganese compounds, fine mineral fibers, and 
polycyclic organic matter--were not previously on the CERCLA list.
    In the October 22, 1993 NPRM, EPA requested public comments on the 
following five options for addressing the CERCLA reporting requirements 
for these broad categories:
    (1) Assign no RQ level to the CAA broad generic categories;
    (2) Retain a one-pound RQ for these categories (i.e., the lowest RQ 
EPA assigns to individual hazardous substances);
    (3) Assign an RQ to each category that reflects either the average 
RQ or the lowest RQ of the substances within each category;
    (4) Assign a 5,000-pound RQ to each category (i.e., the highest RQ 
EPA assigns to individual hazardous substances); or
    (5) Identify and assign an RQ to certain substances within each 
category. For the remaining substances within each of the five 
categories not assigned a specific RQ, assign no RQ, retain a one-pound 
RQ, assign an average or lowest RQ, or assign a 5,000-pound RQ.
    In the preamble to the proposed rule, EPA described a variety of 
factors that it would consider in choosing an option that protects 
public health and welfare and the environment. These factors included: 
the length of time EPA would need to evaluate a large number of 
compounds individually; the need to have meaningful information 
reported to the National Response Center (i.e., avoiding either too 
much or too little information); and the need to avoid unnecessary and 
costly reporting burdens. After careful evaluation of these factors and 
consideration of all public comments on the five options, the Agency 
believes that, as suggested by 34 of the 44 commenters who addressed 
the options, the most effective balance of these factors would be to 
implement one of the reporting scenarios described in Option 5. Under 
[[Page 30933]] the selected option, the Agency is assigning no RQ level 
to the five CAA broad generic categories, but will evaluate and may 
individually list in Table 302.4 of 40 CFR 302.4 certain substances 
within the categories, and assign RQs to these substances.
    In response to five commenters' requests to accelerate promulgation 
of the RQ adjustments for the hazardous air pollutants proposed in the 
October 22, 1993 NPRM, the Agency expedited the schedule for today's 
final rule; for this reason, the Agency has not yet implemented the 
portion of Option 5 that involves identifying additional substances 
within the categories to determine if individual listing in Table 302.4 
is warranted, but will do so at a later date.
    The remainder of Section II.C first provides an overview of EPA's 
evaluation of each of the five options using the factors presented in 
the proposed rule. This overview also includes the number of commenters 
that favored each option. The public comments are then summarized and 
responses provided by the following topic areas: (1) Definition and 
scope of the categories; and (2) other issues.
    Selecting Option 1 (assigning no RQ to the five CAA broad generic 
categories) would eliminate the time needed for EPA to evaluate member 
substances individually. Option 1 also would be the least costly and 
burdensome of the options because reporting of such member substances 
would not be required (except for those that are already listed 
separately). The major disadvantage of Option 1 is that it does not 
contain any provisions for individually listing and assigning RQs to 
specific substances in future rulemakings. EPA believes that upon 
further identification and analysis of the substances within the 
categories, there may be certain individual substances that merit 
separate listing and reporting requirements to protect adequately 
public health and welfare and the environment. Eight commenters favored 
Option 1.
    The Agency decided that Option 2 (retaining a one-pound RQ for the 
category) would be infeasible for a variety of reasons. As correctly 
noted by several commenters, a one-pound RQ would not take into 
consideration the varying characteristics of all of the specific 
compounds in the categories. Thus, Option 2 would result in a large 
burden on the regulated community for reporting small releases of 
thousands of substances whose inherent chemical characteristics do not 
warrant reporting at such low release levels. In addition, the large 
number of reports of small releases would hinder the National Response 
Center's ability to receive and process meaningful information and, 
therefore, the government's ability to respond to releases that are 
much more likely to pose a threat to public health or welfare or the 
environment. No commenters favored Option 2.
    Similarly, the Agency determined that Option 3 (assign an RQ to 
each category that reflects either the average RQ or the lowest RQ of 
the substances within the category) would be infeasible. Assigning an 
average RQ to the categories, in addition to the disadvantages of 
Option 2, would be extremely time- and resource-intensive because EPA 
would need to evaluate all known individual substances within each 
category to determine an RQ for each so that an average RQ for the 
category could be calculated. Assigning the lowest RQ of the member 
substances to the category, similar to Option 2, would result in 
reporting of a large number of small releases that would hinder 
government response capabilities. This portion of Option 3 also would 
be time- and resource-intensive because EPA would need to evaluate the 
substances within the categories to determine the lowest RQ of the 
member substances. No commenters favored Option 3.
    Option 4 (assign a 5,000-pound RQ to each category) would be less 
burdensome than Options 2 and 3, but also would be technically 
inappropriate for certain substances that may pose greater hazards. 
Only two commenters favored Option 4.
    Option 5 involves identifying and assigning RQs to certain 
substances within each category, but contains several possible 
variations on how to treat the remaining substances (i.e., assign no 
RQ, assign a one-pound RQ, assign an average or lowest RQ, or assign a 
5,000-pound RQ). These variations correspond to the previous four 
options. A total of 34 commenters favored Option 5 as an acceptable 
variation of Option 1.
    EPA has concluded that Option 5 is preferable to the other four 
options because it allows the Agency greater flexibility to achieve the 
appropriate balance between reporting burdens, the amount of time 
needed for EPA to evaluate individual member substances, and protection 
of public health and welfare and the environment. In particular, EPA 
has chosen the variation of Option 5 under which the Agency assigns no 
RQ to the category but identifies, designates, and assigns RQs to 
certain individual substances within the category at a later date. 
Thus, reporting will be required for these substances, but not for 
other substances within the categories that do not merit separate 
CERCLA listing. This process of identifying member substances and 
assigning RQs will require a considerable amount of time and Agency 
resources, which will vary depending on the number of substances 
designated. The major advantage of this variation of Option 5 is that 
reports to the National Response Center will be limited to information 
that specifically applies to substances that have been evaluated and 
for which a determination has been made that they should be 
individually listed in Table 302.4 of 40 CFR part 302.
    It is important to note that CERCLA liability continues to apply to 
releases of all compounds within each category, even if these compounds 
are not listed separately in Table 302.4 and, therefore, RQs have not 
been assigned. Parties responsible for releases of hazardous substances 
that fall under any of the five CAA broad generic categories are liable 
for the costs associated with cleanup and any natural resource damages 
resulting from the release.
2. Definition and Scope of the Categories
    Five commenters noted that certain footnotes from the CAA 
Amendments of 1990 that apply to three of the five CAA broad generic 
categories (glycol ethers, fine mineral fibers, and polycyclic organic 
matter) were not included in the October 22, 1993 NPRM. The commenters 
asserted that, without these footnotes, the listings for these three 
categories in Table 302.4 of 40 CFR 302.4 would be unclear and subject 
to different interpretations. For this reason, the commenters urged EPA 
to include the footnotes to these three CAA categories in the 
regulatory list of CERCLA hazardous substances (i.e., Table 302.4).
    In the October 22, 1993 NPRM, the Agency intended that the proposed 
listings in Table 302.4 of 40 CFR 302.4 for these hazardous air 
pollutants (including the five CAA broad generic categories) be the 
same as the listings for these substances in the CAA Amendments 
(subject to clarification by regulations implementing these 
amendments). As the commenters correctly note, footnotes 2, 3, and 4 in 
the CAA Amendments that limit the CAA section 112 listings of ``glycol 
ethers,'' ``fine mineral fibers,'' and ``polycyclic organic matter,'' 
respectively, also apply to these same listings in Table 302.4. To 
clarify this issue in today's final rule, EPA is revising the three 
category listings (glycol ethers,\2\ fine mineral fibers,\3\ and 
polycyclic organic matter \4\) proposed in [[Page 30934]] the October 
22, 1993 NPRM to add the applicable footnotes from the CAA Amendments 
of 1990:

    \2\ Includes mono- and di- ethers of ethylene glycol, diethylene 
glycol, and triethylene glycol R-(OCH2CH2)n-OR' where

    n = 1, 2, or 3
    R = alkyl or aryl groups
    R'= R, H, or groups which, when removed, yield glycol ethers 
with the structure: R-(OCH2CH2)n-OH.26 Polymers are 
excluded from the glycol category.

    \26\ The Agency would like to note that a typographical error 
has been made in the second mention of the chemical formula for 
glycol ethers in footnote 2 from the CAA Amendments. This formula 
appears in the CAA Amendments as ``R-(OCH2CH)n-OH.'' In Table 
302.4 of today's final rule, an additional ``2'' has been added 
within the parentheses; thus, the formula in the regulation will 
read ``R-(OCH2CH2)n-OH,'' rather than the way it appears in the 
CAA Amendments.
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    \3\ Includes mineral fiber emissions from facilities 
manufacturing or processing glass, rock, or slag fibers (or other 
mineral derived fibers) of average diameter 1 micrometer or less.
    \4\ Includes organic compounds with more than one benzene ring, 
and which have a boiling point greater than or equal to 100  deg.C. 
(42 U.S.C.A. 7412 (b)(1))

    EPA believes that such clarification will assist persons in charge 
of vessels and facilities in determining whether a release contains a 
substance within these three CAA categories and, thus, a CERCLA 
hazardous substance subject to liability, response, and abatement 
provisions under CERCLA.
    Some commenters asserted that, even with the inclusion of these 
footnotes from the CAA Amendments of 1990, the definitions of the 
glycol ethers, fine mineral fibers, and polycyclic organic matter 
categories are overly broad. The Agency agrees that, although the 
categories have been partially limited in definition and scope by the 
footnotes noted above, the categories remain broad. The only action EPA 
is taking in this rulemaking is to codify the listings of polycyclic 
organic matter, glycol ethers, and fine mineral fibers on the 
regulatory list of hazardous substances in Table 302.4 of 40 CFR 302.4. 
Any further clarification of the definitions of these categories would 
more appropriately be addressed under regulations implementing CAA 
section 112.27

    \27\ For detailed responses to specific comments on the scope of 
these five CAA categories, see Section III.A of the responses to 
comments document for this rulemaking, available for inspection at 
the CERCLA Docket Office, Crystal Gateway #1, 12th Floor, 1235 
Jefferson Davis Highway, Arlington, VA 22202.
---------------------------------------------------------------------------

    Four commenters concluded that, because of the footnote limiting 
the definition of the category fine mineral fibers, refractory ceramic 
fibers (RCF) and other manmade vitreous fibers (MMVF) are not within 
the scope of the category and, thus, are not CERCLA hazardous 
substances. Provided RCF and other MMVF have an average diameter larger 
than one micrometer, the Agency agrees that these substances would not 
fall within the fine mineral fibers category under CERCLA and, thus, 
would not be subject to release reporting and liability requirements. 
Should RCF or other MMVF, however, have an average diameter of one 
micrometer or less, these substances would be considered hazardous 
substances and, therefore, would be subject to CERCLA requirements.
    One of these four commenters requested that any CERCLA listing of 
MMVF, including RCF, apply only to air emissions and should not include 
releases to water or land. The commenter stated that EPA's CERCLA 
listing for asbestos appears to provide a precedent for its recommended 
approach. EPA disagrees with the commenter's recommendation because 
CERCLA regulates releases of hazardous substances to all environmental 
media. For example, the listing of asbestos as a CERCLA hazardous 
substance encompasses all forms of this substance; it is only the 
reporting requirement that is limited to releases of ``friable'' forms 
of asbestos. Nevertheless, releases of ``friable'' asbestos to 
environmental media other than air remain subject to CERCLA reporting 
requirements and any releases of asbestos remain subject to the 
liability scheme under CERCLA. Similarly, releases of fine mineral 
fibers that are listed individually in Table 302.4 into any 
environmental medium are subject to reporting and releases of any fine 
mineral fibers that fall within the CAA fiber-size limitation (one 
micrometer or less) to any environmental medium are subject to CERCLA's 
liability scheme.
    Owners and operators of underground storage tanks containing 
substances that may fall within the five CAA broad generic categories 
have requested guidance regarding the scope of these categories to 
assist them in determining whether they are regulated under RCRA 
Subtitle I. For an underground storage tank to fall under the 
regulatory jurisdiction of RCRA Subtitle I, the tank must store a 
``regulated substance.'' The term regulated substance is defined as 
petroleum and CERCLA hazardous substances, as defined in CERCLA section 
101(14) (excluding RCRA hazardous wastes) (see 40 CFR 280.12). To 
assist in determining whether particular substances stored are members 
of the CAA categories and, therefore, are CERCLA hazardous substances 
subject to the RCRA Subtitle I underground storage tank regulations, 
owners and operators may refer to the definitions of these categories 
in section 112 of the CAA. Appropriate Agency offices will coordinate 
to develop a process to further assist owners and operators in making 
this determination.
3. Other Issues
    Three commenters requested that EPA identify by Chemical Abstract 
Service Registry Number (CASRN) the substances within the CAA broad 
generic categories for which releases must be reported. EPA's choice of 
Option 5 satisfies this request. Because EPA is assigning no RQ to 
these five categories, only releases of substances individually listed 
with an RQ and CASRN in Table 302.4 require CERCLA notification. 
Therefore, in effect, EPA already has identified by CASRN in Table 
302.4 the CERCLA hazardous substances for which releases must be 
reported.
    Another commenter suggested that, because categories may not be 
identical in potential hazard, different reporting options may be 
suitable for different categories. The Agency does not agree that 
implementing differing approaches to reporting requirements for the 
different broad generic categories is warranted. The main similarity 
among the categories is that each contains hundreds or thousands of 
substances with varying toxicities. Based on this similarity, and on a 
variety of other factors considered by the Agency (see Section II.C.1 
for a discussion of these factors), EPA decided that assigning a single 
RQ to a particular category is inappropriate for all five categories. 
Thus, for each of the five CAA categories, the Agency is assigning no 
RQ.
    A different commenter suggested that overreporting would result if 
EPA were to assign an RQ for only a few specific compounds within a 
category. EPA disagrees with this assertion. In an April 4, 1985 final 
rule (50 FR 13456), and in several subsequent final rules, the Agency 
assigned adjusted RQs to specific substances that are listed 
individually in Table 302.4 and that also fall within the broad generic 
categories listed under CWA section 307(a). Adjusted RQs for some of 
these individually listed CWA substances have been in place for nearly 
10 years. Based on the number of releases of these individually listed 
CWA substances that have been reported to the National Response Center, 
there is no indication that overreporting has resulted in the case of 
the CWA broad generic categories. Similarly, EPA does not believe that 
overreporting would occur [[Page 30935]] for the CAA broad generic 
categories if the Agency, as a result of its evaluation of the CAA 
categories, chooses to list specific substances within the categories 
and assign RQs to these substances.
    The same commenter asserted that, if EPA assigned an RQ to only one 
compound within a CAA broad generic category, a facility could be out 
of compliance if it chose not to report a release of that compound. In 
fact, each of the five CAA broad generic categories in today's final 
rule contains at least one substance that already is individually 
listed as a CERCLA hazardous substance with an RQ in Table 302.4. 
Examples of separately listed CERCLA hazardous substances that are 
members of the categories include cobaltous bromide (cobalt compounds), 
2-ethoxyethanol (glycol ethers), potassium permanganate (manganese 
compounds), asbestos (fine mineral fibers), and benzo[a]pyrene 
(polycyclic organic matter). Under CERCLA section 103, releases equal 
to or greater than the RQs for these hazardous substances must be 
reported to the National Response Center as soon as the person in 
charge has knowledge of the release. Thus, EPA agrees with the 
commenter's assessment that a facility would be out of compliance if it 
failed to report a release of an RQ or more of an individually listed 
substance within any of the CAA broad generic categories.
    In addition, the same commenter noted that, if a facility has no 
knowledge of the specific compounds released, then only the CAA broad 
generic category reporting requirement (i.e., no RQ for the category) 
would apply. This assertion, however, is inaccurate with respect to 
releases of hazardous substances that are within one of the generic 
listings and that also are individually listed in Table 302.4 with 
corresponding RQs.
    Under CERCLA section 103(a), notification must occur when the 
person in charge of a facility has knowledge of a release of such a 
hazardous substance in an amount that equals or exceeds an RQ. This 
includes individually listed hazardous substances within the CAA broad 
generic categories. The determination of whether the person in charge 
has knowledge depends on the actions that a person in that position 
could reasonably be expected to take under the circumstances. In 
evaluating possible enforcement proceedings for failure to comply with 
the CERCLA section 103 reporting requirement, the Agency's 
determination whether the person in charge had knowledge will be made 
on a case-by-case basis. EPA believes that the most prudent course of 
action for the person in charge would be to identify the substance(s) 
being released and to determine if the amount of the substance(s) 
released equals or exceeds an RQ. The Agency believes that this 
approach on the part of persons in charge would also help to avoid 
overreporting.
    A different commenter expressed confusion because EPA failed to 
mention, in the October 22, 1993 NPRM, the commenter's 1992 petition to 
designate and assign RQs to about 20 ethylene glycol ethers within the 
larger CAA category of glycol ethers.28 When the proposed rule was 
published, however, the Agency was still evaluating various options for 
applying reporting requirements to the five CAA broad generic 
categories, including ``glycol ethers.'' Only after receiving and 
evaluating comments on the five options presented in the October 22, 
1993 NPRM, did the Agency decide to select Option 5. EPA believes that 
responding to the commenter's petition to adjust RQs of substances 
within the glycol ethers category, prior to an Agency decision on the 
appropriate reporting requirements for the category, would have been 
premature and might have led to confusion within the regulated 
community about what reporting requirements apply to the CAA category 
of glycol ethers. Following promulgation of today's final rule, 
however, EPA will begin to evaluate the data submitted by the commenter 
to determine whether individual listing in Table 302.4 and RQ 
adjustment of specific ethylene glycol ethers is warranted under the 
selected Option 5.

    \28\ Petition to Adjust the Reportable Quantity for Glycol 
Ethers under CERCLA Section 102. July 8, 1992. From Gordon D. 
Strickland, Chemical Manufacturers Association to Barbara Hostage, 
Emergency Response Division, U.S. EPA.
---------------------------------------------------------------------------

    Two commenters suggested that EPA could establish subcategories 
within the CAA broad generic categories, and assign separate RQs to the 
subcategories. For example, one commenter suggested that EPA assign a 
low RQ to the subcategory of carcinogenic polynuclear aromatic 
hydrocarbons (PAHs) within the larger CAA category of polycyclic 
organic matter, and a higher RQ for non-carcinogenic PAHs. EPA 
appreciates the commenters' suggestion and may consider using these 
subcategories in any future determination of whether individual listing 
in Table 302.4 and RQ adjustment of specific PAHs (or subcategories of 
PAHs) is warranted.
    One commenter claimed that only individual chemicals listed under 
CAA section 112 are CERCLA hazardous substances, and that CAA category 
members not otherwise listed under CERCLA need not be reported at the 
one-pound level. The Agency disagrees with the commenter's assertion 
that the one-pound statutory RQs did not require reporting of 
substances (other than those listed separately in Table 302.4) within 
the CAA categories prior to this final rule. CERCLA section 101(14)(E) 
states that the term ``hazardous substance'' includes ``any hazardous 
air pollutant listed under section 112 of the Clean Air Act.'' Thus, 
the CAA categories automatically became hazardous substances by virtue 
of their listing as hazardous air pollutants under CAA section 112. 
CERCLA section 102(b) provides that an RQ of one pound applies to 
hazardous substances (which include the CAA hazardous air pollutants) 
until this RQ is adjusted by regulation. All substances within the 
categories, as well as the categories themselves, are CERCLA hazardous 
substances. Therefore, during the period beginning with the signing of 
the CAA Amendments of 1990 and ending with the effective date of 
today's final rule, the one-pound statutory RQs for the categories have 
applied to all substances within the categories.
    One commenter requested that the Agency consider a low-percentage 
threshold for the CAA categories below which a component of a mixture 
may be excluded from regulation. Unless permitted or exempted, the 
release of an RQ or more of a hazardous substance must be reported, 
regardless of the concentration of the substance released. Notification 
of releases of hazardous substances that equal or exceed an RQ, even 
those with relatively low concentrations, is mandated by CERCLA and EPA 
believes that such reports are essential to allow government personnel 
to decide whether a response action is necessary to protect public 
health or welfare or the environment.29

    \29\ For detailed responses to comments on other issues related 
to the five CAA broad generic categories, see Section III.C of the 
responses to comments document for this rulemaking, available for 
inspection at the CERCLA Docket Office, Crystal Gateway #1, 12th 
Floor, 1235 Jefferson Davis Highway, Arlington, VA 22202.
---------------------------------------------------------------------------

D. Delisting Petition for Caprolactam

    Two commenters requested that EPA respond to a delisting petition 
for caprolactam submitted on July 19, 1993. One of the commenters 
asserted that, ``upon the removal of caprolactam from the [CAA section 
112] list of `hazardous air pollutants,' caprolactam will no longer be 
a CERCLA `hazardous substance' under CERCLA Sec. 101(14) * * *''
    This assertion, however, is not a complete characterization of the 
CERCLA authority for listing [[Page 30936]] caprolactam as a hazardous 
substance. As the commenter correctly notes, caprolactam is included in 
the definition of ``hazardous substance'' because it has been listed as 
a hazardous air pollutant under the CAA, and CERCLA section 101(14)(E) 
incorporates by reference any hazardous air pollutant listed under 
section 112 of the CAA. The commenter has failed to mention, however, 
that under CERCLA section 101(14)(B), the term ``hazardous substance'' 
also includes ``* * * any element, compound, mixture, solution, or 
substance designated pursuant to section 102 of [CERCLA] * * *.'' 
CERCLA section 102(a) authorizes EPA to designate as hazardous and 
assign RQs to those substances which, when released into the 
environment, may present substantial danger to the public health or 
welfare or the environment.
    Furthermore, the regulations governing designation of hazardous 
substances (40 CFR 302.4(a)) provide that ``[t]he elements and 
compounds and hazardous wastes appearing in Table 302.4 are designated 
as hazardous substances under section 102(a) of [CERCLA].'' Thus, once 
a hazardous substance listed under any of the statutes referred to in 
CERCLA section 101(14) is added to the regulatory list at 40 CFR 302.4, 
that substance automatically is also designated as a hazardous 
substance under CERCLA section 102(a). As the commenter acknowledges, 
caprolactam has been proposed to be added to the list at 40 CFR 302.4; 
therefore, upon the effective date of this final rule, caprolactam is 
also designated as a hazardous substance under CERCLA section 102(a), 
not only under section 101(14)(E).
    If the commenter is correct that its petition to delist caprolactam 
under CAA section 112 will be granted,30 then EPA would evaluate 
caprolactam to determine whether there is any independent basis for 
retaining this substance as hazardous under section 102(a) of CERCLA 
and 40 CFR 302.4(a). If EPA determines that there is no independent 
basis for retaining caprolactam in Table 302.4, it may be possible to 
delete caprolactam from the CERCLA list of hazardous substances 
simultaneously with delisting under the CAA.

    \30\ CAA section 112(b)(3)(C) requires delisting of a hazardous 
air pollutant if EPA finds ``that there is adequate data on the 
health and environmental effects [of the substance] to determine 
that emissions, ambient concentrations, bioaccumulation or 
deposition of the substance may not reasonably be anticipated to 
cause any adverse effects to the human health or adverse 
environmental effects.'' EPA has not yet issued a final 
determination whether the petition to delist caprolactam meets the 
CAA delisting criteria.
---------------------------------------------------------------------------

    In addition, the commenter cited a May 25, 1983 proposed rule (48 
FR 23554), in which EPA suggested that changes to lists of substances 
under statutes incorporated in the CERCLA definition of a hazardous 
substance (CERCLA section 101(14)) would be reflected simultaneously on 
the CERCLA list of hazardous substances in Table 302.4 at 40 CFR 302.4. 
In the April 4, 1985 final rule (50 FR 13456), however, EPA modified 
this previous policy by providing that all hazardous substances in 
Table 302.4 are also designated under CERCLA section 102(a) (see 40 CFR 
302.4(a)). Thus, even if substances are removed from lists under other 
statutes referred to in CERCLA section 101(14), these substances may 
remain in Table 302.4 by virtue of their designation under CERCLA 
section 102(a). Because of the CERCLA section 102(a) designation 
reflected in 40 CFR 302.4(a), the Agency does not believe that changes 
to lists of substances under statutes listed in CERCLA section 101(14) 
necessarily require simultaneous changes to Table 302.4.

III. Changes to List of Hazardous Substances and Their RQs

    To show more clearly the two types of changes to the list of CERCLA 
hazardous substances resulting from the addition of the CAA Amendments 
hazardous air pollutants and the RCRA hazardous wastes, EPA proposed in 
the October 22, 1993 NPRM, and is promulgating in today's final rule 
two sets of revisions to Table 302.4 of 40 CFR 302.4. One set of 
revisions contains the new listings for the CAA Amendments hazardous 
air pollutants (including the revised cresols and xylenes entries) and 
the RCRA hazardous wastes, including final RQs for these substances. 
The other set of revisions adds a new statutory source code for certain 
hazardous substances that were already on the CERCLA list (e.g., 
acetaldehyde and acetonitrile) to indicate that, as a result of their 
listing as hazardous air pollutants in the CAA Amendments, an 
additional statutory source for designation of these hazardous 
substances is CAA section 112.

IV. Changes to 40 CFR Parts 355 and 117

    Appendices A and B of 40 CFR part 355, which list extremely 
hazardous substances (EHSs) and their threshold planning quantities 
(TPQs) under EPCRA, also show the RQs for EHSs. Five of the new CAA 
hazardous air pollutants whose RQs are adjusted today are also EHSs. 
These substances are chloroacetic acid, hydroquinone, beta-
propiolactone, titanium tetrachloride, and o-cresol. This rule 
promulgates 100-pound RQ adjustments for chloroacetic acid, 
hydroquinone, and o-cresol, a 10-pound RQ adjustment for beta-
propiolactone, and a 1,000-pound RQ adjustment for titanium 
tetrachloride. Therefore, to reflect fully the RQ adjustments for these 
five substances, EPA today is revising Appendices A and B of 40 CFR 
part 355 to include these new adjusted RQs.
    EPA also is amending the RQs for ``cresol'' and ``xylene (mixed)'' 
in Table 117.3 of 40 CFR part 117 to be consistent with the CERCLA RQs. 
Table 117.3, the list of CWA hazardous substances and their RQs, 
currently contains listings for ``cresol'' and ``xylene (mixed),'' each 
with an RQ of 1,000 pounds. ``Cresol'' and ``xylene (mixed)'' are 
included in Table 117.3 because they were originally listed as 
hazardous substances under CWA section 311(b)(4).

V. Regulatory Analyses

A. Executive Order 12866

    Under Executive Order 12866 (58 FR 51735, October 4, 1993), the 
Agency must determine whether the regulatory action is ``significant'' 
and, therefore, subject to review by the Office of Management and 
Budget (OMB) and the requirements of the Executive Order. The Order 
defines ``significant regulatory action'' as one that is likely to 
result in a rule that may:
    (1) Have an annual effect on the economy of $100 million or more, 
or adversely affect in a material way the economy, a sector of the 
economy, productivity, competition, jobs, the environment, public 
health or safety, or State, local, or tribal governments or 
communities;
    (2) Create a serious inconsistency or otherwise interfere with an 
action taken or planned by another agency;
    (3) Materially alter the budgetary impact of entitlements, grants, 
user fees, or loan programs or the rights and obligations of recipients 
thereof; or
    (4) Raise novel legal or policy issues arising out of legal 
mandates, the President's priorities, or the principles set forth in 
the Executive Order.
    It has been determined that this final rule is not a ``significant 
regulatory action'' under the terms of Executive Order 12866 and is 
therefore not subject to OMB review. An economic analysis performed by 
EPA \31\ shows that this [[Page 30937]] final rule will result in a net 
cost savings of approximately $500,000 annually, and does not result in 
any of the other effects that define a significant regulatory action. 
In this final rule, RQs for 44 of the 47 individual hazardous air 
pollutants and three of the 11 RCRA wastes are raised. In addition, as 
noted in Section II.C.1 of this preamble, EPA is assigning no RQ level 
to the five broad generic categories of hazardous air pollutants. The 
RQs of the cresols and xylenes categories and the five hazardous wastes 
with RQs based on the RQ for cresols are being lowered from previously 
adjusted levels. The estimated net effect of these changes will be to 
reduce by approximately 1,300 the number of reportable releases for 
these hazardous substances each year (see the economic analysis 
mentioned above). The estimated $500,000 net cost savings reflects only 
those effects of the RQ adjustments that are readily quantifiable in 
dollars and are associated with the release notification requirements 
under section 103 of CERCLA and section 304 of EPCRA (including the 
associated activities of recordkeeping, notification processing, 
monitoring, and response).

    \31\ See the Economic Impact Analysis of Reportable Quantity 
Adjustments for CAA Hazardous Air Pollutants and RCRA Hazardous 
Wastes, Volume VI, available for inspection at the CERCLA Docket 
Office, Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis 
Highway, Arlington, VA 22202.
---------------------------------------------------------------------------

B. Regulatory Flexibility Act

    The Regulatory Flexibility Act of 1980 requires that a Regulatory 
Flexibility Analysis be performed for all rules that are likely to have 
a ``significant impact on a substantial number of small entities.'' If 
this criterion is met, the Agency must conduct a Regulatory Flexibility 
Analysis to examine ways its regulation could be modified to mitigate 
these adverse impacts. A Regulatory Flexibility Analysis is not 
necessary for this final rule, because the upper-bound total cost of 
compliance to small firms is negligible.\32\ In fact, as noted in 
Section V.A. of today's preamble, the Agency anticipates that raising 
most of the statutory one-pound RQs for the hazardous air pollutants, 
as well as assigning no RQ to the five CAA categories in this rule, 
will result in a net cost savings. Therefore, EPA hereby certifies that 
today's final rule is not likely to have a significant impact on a 
substantial number of small entities. As a result, no Regulatory 
Flexibility Analysis is necessary.

    \32\ See the Regulatory Impact Analysis of Reportable Quantity 
Adjustments Under Sections 102 and 103 of the Comprehensive 
Environmental Response, Compensation, and Liability Act, Volume I, 
March 1985, available for inspection at the CERCLA Docket Office, 
Crystal Gateway #1, 12th Floor, 1235 Jefferson Davis Highway, 
Arlington, VA 22202.
---------------------------------------------------------------------------

C. Paperwork Reduction Act

    The information collection requirements contained in this final 
rule have been approved by OMB under the provisions of the Paperwork 
Reduction Act, 44 U.S.C. 3501 et seq., and have been assigned OMB 
control number 2050-0046. The public reporting burden for the 
collection of information pursuant to CERCLA section 103 is estimated 
to take, on average, 4.1 hours per response. This estimate includes the 
determination whether a release requires a report to the National 
Response Center, the time required to make the call, and the time 
required to maintain a log of any calls made to government 
organizations.
    Because the RQs for almost all of the substances included in 
today's final rule are being raised, the net reporting and 
recordkeeping burden associated with reporting releases of these 
substances under CERCLA section 103 is expected to decrease. As noted 
in the economic impact analysis supporting today's final rule, EPA 
estimates that the annual reporting and recordkeeping burdens 
associated with reports to the National Response Center will be reduced 
by more than 5,300 hours as a result of these RQ adjustments.
    Send comments regarding the burden estimate or any other aspect of 
this collection of information, including suggestions for reducing this 
burden, to Chief, Information Policy Branch, Mail Code 2136, U.S. 
Environmental Protection Agency, 401 M Street, SW., Washington, DC 
20460; and to the Office of Information and Regulatory Affairs, Office 
of Management and Budget, Washington, DC 20503, marked ``Attention: 
Desk Officer for EPA.''

D. Unfunded Mandates

    Under section 202 of the Unfunded Mandates Reform Act of 1995, 
signed into law on March 22, 1995, EPA must prepare a statement to 
accompany any rule in which the estimated costs to State, local, or 
tribal governments in the aggregate, or to the private sector, will be 
$100 million or more in any one year. Under section 205 of this Act, 
EPA must select the most cost-effective and least-burdensome 
alternative that achieves the objective of the rule and that is 
consistent with statutory requirements. Section 203 of the Act requires 
EPA to establish a plan for informing and advising any small 
governments that may be significantly impacted by the rule.
    EPA has determined that this final rule does not include a Federal 
mandate that may result in estimated costs of $100 million or more to 
either State, local, or tribal governments in the aggregate, or to the 
private sector.
List of Subjects

40 CFR Part 117

    Environmental protection, Hazardous substances, Penalties, 
Reporting and recordkeeping requirements, Water pollution control.

40 CFR Part 302

    Air pollution control, Chemicals, Emergency Planning and Community 
Right-to-Know Act, Extremely hazardous substances, Hazardous chemicals, 
Hazardous materials, Hazardous materials transportation, Hazardous 
substances, Hazardous wastes, Intergovernmental relations, Natural 
resources, Pesticides and pests, Reporting and recordkeeping 
requirements, Superfund, Waste treatment and disposal, Water pollution 
control, Water supply.

40 CFR Part 355

    Air pollution control, Chemical accident prevention, Chemical 
emergency preparedness, Chemicals, Community emergency response plan, 
Community right-to-know, Contingency planning, Disaster assistance, 
Emergency Planning and Community Right-to-Know Act, Extremely hazardous 
substances, Hazardous substances, Intergovernmental relations, Natural 
resources, Penalties, Reportable quantity, Reporting and recordkeeping 
requirements, Superfund Amendments and Reauthorization Act, Threshold 
planning quantity, Water pollution control, Water supply.

    Dated: May 23, 1995.
Carol M. Browner,
Administrator.

    For the reasons set out in the preamble, Chapter I of title 40 of 
the Code of Federal Regulations is amended as follows:

PART 117--DETERMINATION OF REPORTABLE QUANTITIES FOR HAZARDOUS 
SUBSTANCES

    1. The authority citation for part 117 continues to read as 
follows:

    Authority: Secs. 311 and 501(a), Federal Water Pollution Control 
Act (33 U.S.C. 1251 et seq.), (``the Act'') and Executive Order 
11735, superseded by Executive Order 12777, 56 FR 54757.

    2. Section 117.3 is amended by revising the entries in the 
``category'' column and in the ``RQ in pounds (kilograms)'' column for 
``cresol'' and ``xylene (mixed)'' in Table 117.3 from 
[[Page 30938]] ``C'' to ``B'' and from ``1,000 (454)'' to ``100 
(45.4),'' respectively, as set forth below:


Sec. 117.3  Determination of Reportable Quantities.

* * * * *

 Table 117.3.--Reportable Quantities of Hazardous Substances Designated 
             Pursuant to Section 311 of the Clean Water Act             
                  *        *        *        *        *                 
------------------------------------------------------------------------
                                                                RQ in   
           Material                      Category               pounds  
                                                             (kilograms)
------------------------------------------------------------------------
                                                                        
                  *        *        *        *        *                 
Cresol.......................  B...........................   100 (45.4)
                                                                        
                  *        *        *        *        *                 
Xylene (mixed)...............  B...........................   100 (45.4)
                                                                        
                  *        *        *        *        *                 
------------------------------------------------------------------------

* * * * *

PART 302--DESIGNATION, REPORTABLE QUANTITIES, AND NOTIFICATION

    3. The authority citation for part 302 continues to read as 
follows:

    Authority: 42 U.S.C. 9602, 9603, 9604; 33 U.S.C. 1321 and 1361.

    4. Section 302.4 is amended by adding the following new entries to 
Table 302.4 and its Appendix A, and by adding footnotes ``a'' and ``b'' 
to Table 302.4 as set forth below:


Sec. 302.4  Designation of hazardous substances.

* * * * *

                                           Table 302.4--List of Hazardous Substances and Reportable Quantities                                          
                                             [Note: All Comments/Notes Are Located at the End of This Table]                                            
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                              Statutory                             Final RQ            
                                                                             ---------------------------------------------------------------------------
      Hazardous substance           CASRN           Regulatory synonyms                                    RCRA waste                                   
                                                                                   RQ      Code       No.          Category       Pounds (Kg)   
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Acetamide......................        60355  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
4-Aminobiophenyl...............        92671  ..............................           1*             3  .............  X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
o-Anisidine....................        90040  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene a......................                                                                                                                      (*)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, dimethyl-.............      1330207  Xylene, Xylene (mixed),                1000         1,3,4  U239           B                     100 (45.4)
                                               Xylenes (isomers and mixture).                                                                           
Benzene,m-dimethyl-............       108383  m-Xylene......................           1*             3  .............  C                     1000 (454)
Benzene, o-dimethyl-...........        95476  o-Xylene......................           1*             3  .............  C                     1000 (454)
Benzene, p-dimethyl-...........       106423  p-Xylene......................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Biphenyl.......................        92524  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,3-Butadiene..................       106990  ..............................           1*             3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Calcium cyanamide..............       156627  ..............................           1*             3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Caprolactam....................       105602  ..............................           1*             3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbonyl sulfide...............       463581  ..............................           1*             3  .............  B                     100 (45.4)
Catechol.......................       120809  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chloramben.....................       133904  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chloroacetic acid..............        79118  ..............................           1*             3  .............  B                     100 (45.4)
2-Chloroacetophenone...........       532274  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chloroprene....................       126998  ..............................           1*             3  .............  B                     100 (45.4)
[[Page 30939]]
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Cobalt compounds...............         N.A.  ..............................           1*             3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Cresols (isomers and mixture)..      1319773  Cresylic acid (isomers and             1000         1,3,4  U052           B                     100 (45.4)
                                               mixture) Phenol, methyl.                                                                                 
m-Cresol.......................       108394  m-Cresylic acid...............           1*             3  .............  B                     100 (45.4)
o-Cresol.......................        95487  o-Cresylic acid...............           1*             3  .............  B                     100 (45.4)
p-Cresol.......................       106445  p-Cresylic acid...............           1*             3  .............  B                     100 (45.4)
Cresylic acid (isomers and           1319773  Cresols (isomers and mixture)          1000         1,3,4  U052           B                     100 (45.4)
 mixture).                                     Phenol, methyl.                                                                                          
m-Cresylic acid................       108394  m-Cresol......................           1*             3  .............  B                     100 (45.4)
o-Cresylic acid................        95487  o-Cresol......................           1*             3  .............  B                     100 (45.4)
p-Cresylic acid................       106445  p-Cresol......................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
DDET b.........................      3547044  ..............................           1*             3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Diazomethane...................       334883  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dibenzofuran...................       132649  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Diethanolamine.................       111422  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
N,N-Diethylaniline.............        91667  ..............................           1*             3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Diethyl sulfate................        64675  ..............................           1*             3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
N,N-Dimethylaniline............       121697  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dimethylformamide..............        68122  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,2-Epoxybutane................       106887  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Ethylene glycol................       107211  ..............................           1*             3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Fine mineral fibers c..........         N.A.  ..............................           1*             3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Glycol ethers d................         N.A.  ..............................           1*             3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hexamethylene-1,6-diisocyanate.       822060  ..............................           1*             3  .............  B                     100 (45.4)
Hexamethylphosphoramide........       680319  ..............................           1*             3  .............  X                      1 (0.454)
Hexane.........................       110543  ..............................           1*             3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydroquinone...................       123319  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Manganese Compounds............         N.A.  ..............................           1*             3  .............  .............               (**)
                                                                                                                                                        
[[Page 30940]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
MDI............................       101688  Methylene diphenyl                       1*             3  .............  D                    5000 (2270)
                                               diisocyanate.                                                                                            
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
4,4'-Methylenedianiline........       101779  ..............................           1*             3  .............  A                      10 (4.54)
Methylene diphenyl diisocyanate       101688  MDI...........................           1*             3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Methyl tert-butyl ether........      1634044  ..............................           1*             3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
4-Nitrobiphenyl................        92933  ..............................           1*             3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
N-Nitrosomorpholine............        59892  ..............................           1*             3  .............  X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Phenol, methyl-................      1319773  Cresols (isomers and mixture)          1000         1,3,4  U052           B                     100 (45.4)
                                               Cresylic acid (isomers and                                                                               
                                               mixture).                                                                                                
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
p-Phenylenediamine.............       106503  ..............................           1*             3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Polycyclic Organic Matter e....         N.A.  ..............................           1*             3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
beta-Propiolactone.............        57578  ..............................           1*             3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Propionaldehyde................       123386  ..............................           1*             3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Propoxur (Baygon)..............       114261  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Styrene oxide..................        96093  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Titanium tetrachloride.........      7550450  ..............................           1*             3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Trifluralin....................      1582098  ..............................           1*             3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,2,4-Trimethylpentane.........       540841  ..............................           1*             3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Unlisted Hazardous Wastes               N.A.  ..............................           1*             4  .............  .............  .................
 Characteristics:.                                                                                                                                      
  Characteristics of Toxicity:                                                                                                                          
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
    o-Cresol (D023)............         N.A.  ..............................           1*             4  D023           B                     100 (45.4)
    m-Cresol (D024)............         N.A.  ..............................           1*             4  D024           B                     100 (45.4)
    p-Cresol (D025)............         N.A.  ..............................           1*             4  D025           B                     100 (45.4)
    Cresol (D026)..............         N.A.  ..............................           1*             4  D026           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Vinyl bromide..................       593602  ..............................           1*             3  .............  B                     100 (45.4)
                                                                                                                                                        
[[Page 30941]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Xylene.........................      1330207  Benzene, dimethyl-Xylene               1000         1,3,4  U239           B                     100 (45.4)
                                               (mixed), Xylenes (isomers and                                                                            
                                               mixture).                                                                                                
m-Xylene.......................       108383  Benzene, m-dimethyl-..........           1*             3  .............  C                     1000 (454)
o-Xylene.......................        95476  Benzene, o-dimethyl-..........           1*             3  .............  C                     1000 (454)
p-Xylene.......................       106423  Benzene, p-dimethyl-..........           1*             3  .............  B                     100 (45.4)
Xylene (mixed).................      1330207  Benzene, dimethyl-Xylene               1000         1,3,4  U239           B                     100 (45.4)
                                               Xylenes (isomers and mixture).                                                                           
Xylenes (isomers and mixture)..      1330207  Benzene, dimethyl-Xylene               1000         1,3,4  U239           B                     100 (45.4)
                                               Xylene (mixed).                                                                                          
F004...........................  ...........  ..............................           1*             4  F004           B                      100(45.4)
The following spent non-                                                                                                                                
 halogenated solvents and the                                                                                                                           
 still bottoms from the                                                                                                                                 
 recovery of these solvents:                                                                                                                            
    (a) Cresols/Cresylic acid..      1319773  ..............................         1000         1,3,4  U052           B                      100(45.4)
    (b) Nitrobenzene...........        98953  ..............................         1000         1,2,4  U169           C                      1000(454)
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
F025...........................  ...........  ..............................           1*             4  F025           X                       1(0.454)
Condensed light ends, spent                                                                                                                             
 filters and filter aids, and                                                                                                                           
 spent desiccant wastes from                                                                                                                            
 the production of certain                                                                                                                              
 chlorinated aliphatic                                                                                                                                  
 hydrocarbons, by free radical                                                                                                                          
 catalyzed processes. These                                                                                                                             
 chlorinated aliphatic                                                                                                                                  
 hydrocarbons are those having                                                                                                                          
 carbon chain lengths ranging                                                                                                                           
 from one to and including                                                                                                                              
 five, with varying amounts and                                                                                                                         
 positions of chlorine                                                                                                                                  
 substitution                                                                                                                                           
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
F037...........................  ...........  ..............................           1*             4  F037           X                      1(0.454) 
[[Page 30942]]
                                                                                                                                                        
Petroleum refinery primary oil/                                                                                                                         
 water/solids separation                                                                                                                                
 sludge--Any sludge generated                                                                                                                           
 from the gravitational                                                                                                                                 
 separation of oil/water/solids                                                                                                                         
 during the storage or                                                                                                                                  
 treatment of process                                                                                                                                   
 wastewaters from petroleum                                                                                                                             
 refineries. Such sludges                                                                                                                               
 include, but are not limited                                                                                                                           
 to, those generated in: oil/                                                                                                                           
 water/solids separators; tanks                                                                                                                         
 and impoundments; ditches and                                                                                                                          
 other conveyances; sumps; and                                                                                                                          
 stormwater units receiving dry                                                                                                                         
 weather flow. Sludge generated                                                                                                                         
 in stormwater units that do                                                                                                                            
 not receive dry weather flow,                                                                                                                          
 sludges generated from non-                                                                                                                            
 contact once-through cooling                                                                                                                           
 waters segregated for                                                                                                                                  
 treatment from other process                                                                                                                           
 or oily cooling waters,                                                                                                                                
 sludges generated in                                                                                                                                   
 aggressive biological                                                                                                                                  
 treatment units as defined in                                                                                                                          
 Sec.  261.31(b)(2) (including                                                                                                                          
 sludges generated in one or                                                                                                                            
 more additional units after                                                                                                                            
 wastewaters have been treated                                                                                                                          
 in aggressive biological                                                                                                                               
 treatment units) and K051                                                                                                                              
 wastes are not included in                                                                                                                             
 this listing                                                                                                                                           
F038...........................  ...........  ..............................           1*             4  F038           X                       1(0.454)
[[Page 30943]]
                                                                                                                                                        
Petroleum refinery secondary                                                                                                                            
 (emulsified) oil/water/solids                                                                                                                          
 separation sludge--Any sludge                                                                                                                          
 and/or float generated from                                                                                                                            
 the physical and/or chemical                                                                                                                           
 separation of oil/watersolids                                                                                                                          
 in process wastewaters and                                                                                                                             
 oily cooling wastewaters from                                                                                                                          
 petroleum refineries. Such                                                                                                                             
 wastes include, but are not                                                                                                                            
 limited to, all sludges and                                                                                                                            
 floats generated in: induced                                                                                                                           
 air flotation (IAF) units;                                                                                                                             
 tanks and impoundments, and                                                                                                                            
 all sludges generated in                                                                                                                               
 DAFunits. Sludges generated in                                                                                                                         
 stormwater units that do not                                                                                                                           
 receive dry weather flow,                                                                                                                              
 sludges generated from once-                                                                                                                           
 through non-contact cooling                                                                                                                            
 waters segregated for                                                                                                                                  
 treatment from other process                                                                                                                           
 or oil cooling wastes, sludges                                                                                                                         
 and floats generated in                                                                                                                                
 aggressive biological                                                                                                                                  
 treatment units as defined in                                                                                                                          
 Sec.  261.31(b)(2) (including                                                                                                                          
 sludges and floats generated                                                                                                                           
 in one or more additional                                                                                                                              
 units after wastewaters have                                                                                                                           
 been treated in aggressive                                                                                                                             
 biological treatment units)                                                                                                                            
 and F037, K048, and K051                                                                                                                               
 wastes are not included in                                                                                                                             
 this listing                                                                                                                                           
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
K088...........................  ...........  ..............................           1*             4  K088           A                      10 (4.54)
Spent potliners from primary                                                                                                                            
 aluminum reduction                                                                                                                                     
K090...........................  ...........  ..............................           1*             4  K090           A                      10 (4.54)
Emission control dust or sludge                                                                                                                         
 from ferrochromiumsilicon                                                                                                                              
 production                                                                                                                                             
K091...........................  ...........  ..............................           1*             4  K091           A                      10 (4.54)
Emission control dust or sludge                                                                                                                         
 from ferrochromium production                                                                                                                          
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
--------------------------------------------------------------------------------------------------------------------------------------------------------
Indicates the staturory source as defined by 1, 2, 3, and 4 below.                                                                              
*                  *                  *                  *                  *                  *                  *                                     
1- Indicates that the statutory source for designation of this hazardous substance under CERCLA is CWA section 311(b)(4).                               
2- Indicates that the statutory source for designation of this hazardous substance under CERCLA is CWA section 307(a).                                  
[[Page 30944]]
                                                                                                                                                        
3- Indicates that the statutory source for designation of this hazardous substance under CERCLA is CAA section 112.                                     
4- Indicates that the statutory source for designation of this hazardous substance under CERCLA is RCRA section 3001.                                   
1* Indicates that 1-pound RQ is CERCLA is statutory RQ.                                                                                                 
*                  *                  *                  *                  *                  *                  *                                     
** Indicates that no RQ is being assigned to the generic or broad class.                                                                                
a Benzene was already a CERCLA hazardous substance prior to the CAA Amendments of 1990 and received an adjusted 10-pound RQ based on potential          
  carcinogenicity in an August 14, 1989, final rule (54 FR 33418). The CAA Amendments specify that ``benzene (including benzene from gasoline)'' is a   
  hazardous air pollutant and , thus, a CERCLA hazardous substance.                                                                                     
bThe CAA Amendments of 1990 list DDE (3547-04-4) as a CAA hazardous air pollutant. The CAS number, 3547-04-4, is for the chemical, p,p'-                
  dichlorodiphenylethane. DDE or p,p'-dichlorodiphenyldichloroethylene, CAS number 72-55-9, is already listed in Table 302.4 with a final RQ of 1 pound.
  The substance identified by the CAS number 3547-04-4 has been evaluated and listed as DDE to be consistent with the CAA seciton 112 listing, as       
  amended.                                                                                                                                              
c Includes mineral fiber emissions from facilities manufacturing or processing glass, rock, or slag fibers (or other mineral derived fibers) of average 
  diameter 1 micrometer or less.                                                                                                                        
d Includes mono- and di- ethers of ethylene glycol, diethylene glycol, and triethylene glycol R-(OCH2CH2)n-OR' where                                    
    n=1, 2, or 3                                                                                                                                        
    R=alkyl or aryl groups                                                                                                                              
    R'=R, H, or groups which, when removed, yield glycol ethers with the structure: R-(OCH2CH2)nOH. Polymers are excluded from the glycol category.     
e Includes organic compounds with more than one benzene ring, and which have a boiling point greater than or equal to 100  deg.C.                       

  5. Section 302.4 is also amended by revising the following existing 
entries in Table 302.4 to add note ``3'' to the statutory code column 
and to add the following regulatory synonyms as set forth below. In 
addition, Appendix A to Table 302.4 is amended by revising the 
following entries as set forth below:


Sec. 302.4  Designation of hazardous substances.

* * * * *

                                           Table 302.4--List of Hazardous Substances and Reportable Quantities                                          
                                             [Note: All Comments/Notes Are Located at the End of This Table]                                            
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                              Statutory                             Final RQ            
                                                                             ---------------------------------------------------------------------------
      Hazardous substance           CASRN           Regulatory synonyms                                    RCRA waste                                   
                                                                                   RQ      Code       No.          Category       Pounds (Kg)   
--------------------------------------------------------------------------------------------------------------------------------------------------------
Acetaldehyde...................        75070  Ethanal.......................         1000         1,3,4  U001           C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Acetamide, N-9H-fluoren-2-yl-..        53963  2-Acetylaminofluorene.........           1*           3,4  U005           X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Acetic acid (2,4-                      94757  2,4-D Acid,...................          100         1,3,4  U240           B                     100 (45.4)
 dichlorophenoxy)-, salts &                   2,4-D,salts and esters                                                                                    
 esters.                                                                                                                                                
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Acetonitrile...................        75058  ..............................           1*           3,4  U003           D                    5000 (2270)
Acetophenone...................        98862  Ethanone, 1-phenyl-...........           1*           3,4  U004           D                    5000 (2270)
2-Acetylaminofluorene..........        53963  Acetamide, N-9H-fluoren-2-yl-.           1*           3,4  U005           X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Acrolein.......................       107028  2-Propenal....................            1       1,2,3,4  P003           X                      1 (0.454)
Acrylamide.....................        79061  2-Propenamide.................           1*           3,4  U007           D                    5000 (2270)
Acrylic acid...................        79107  2-Propenoic acid..............           1*           3,4  U008           D                    5000 (2270)
Acrylonitrile..................       107131  2-Propenenitrile..............          100       1,2,3,4  U009           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Allyl chloride.................       107051  ..............................         1000           1,3  .............  C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Aniline........................        62533  Benzenamine...................         1000         1,3,4  U012           D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
ANTIMONY AND COMPOUNDS.........         N.A.  Antimony Compounds............           1*           2,3  .............  .............                 **
Antimony Compounds.............         N.A.  ANTIMONY AND COMPOUNDS........           1*           2,3  .............  .............                 **
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Aroclor 1016...................     12674112  Aroclors......................           10         1,2,3  .............  X                     1 (0.454) 
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
[[Page 30945]]
                                                                                                                                                        
Aroclor 1221...................     11104282  Aroclors......................           10         1,2,3  .............  X                      1 (0.454)
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
Aroclor 1232...................     11141165  ..............................           10         1,2,3  .............  X                      1 (0.454)
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
Aroclor 1242...................     53469219  Aroclors......................           10         1,2,3  .............  X                      1 (0.454)
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
Aroclor 1248...................     12672296  Aroclors......................           10         1,2,3  .............  X                      1 (0.454)
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
Aroclor 1254...................     11097691  Aroclors......................           10         1,2,3  .............  X                      1 (0.454)
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
Aroclor 1260...................     11096825  Aroclors......................           10         1,2,3  .............  X                      1 (0.454)
                                              PCBs                                                                                                      
                                              POLYCHLORINATED BIPHENYLS                                                                                 
Aroclors.......................      1336363  PCBs..........................           10         1,2,3  .............  X                      1 (0.454)
                                              POLYCHLORINATED BIPHENYLS                                                                                 
    Aroclor 1016...............     12674112  ..............................           10         1,2,3  .............  X                      1 (0.454)
    Aroclor 1221...............     11104282  ..............................           10         1,2,3  .............  X                      1 (0.454)
    Aroclor 1232...............     11141165  ..............................           10         1,2,3  .............  X                      1 (0.454)
    Aroclor 1242...............     53469219  ..............................           10         1,2,3  .............  X                      1 (0.454)
    Aroclor 1248...............     12672296  ..............................           10         1,2,3  .............  X                      1 (0.454)
    Aroclor 1254...............     11097691  ..............................           10         1,2,3  .............  X                      1 (0.454)
    Aroclor 1260...............     11096825  ..............................           10         1,2,3  .............  X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
ARSENIC AND COMPOUNDS..........         N.A.  Arsenic Compounds (inorganic             1*           2,3  .............  .............                 **
                                               including arsine).                                                                                       
Arsenic Compounds (inorganic            N.A.  ARSENIC AND COMPOUNDS.........           1*           2,3  .............  .............                 **
 including arsine).                                                                                                                                     
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Aziridine......................       151564  Ethyleneimine.................           1*           3,4  P054           X                      1 (0.454)
Aziridine, 2-methyl-...........        75558  2-Methyl aziridine 1,2-                  1*           3,4  P067           X                      1 (0.454)
                                               Propylenemine.                                                                                           
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzenamine....................        62533  Aniline.......................         1000         1,3,4  U012           D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzenamine, N,N-dimethyl-4-           60117  Dimethyl aminoazobenzene......           1*           3,4  U093           A                      10 (4.54)
 (phenylazo-).                                                                                                                                          
Benzenamine, 2-methyl-.........        95534  o-Toluidine...................           1*           3,4  U328           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzenamine, 4,4'-                    101144  4,4'-Methylenebis(2-                     1*           3,4  U158           A                      10 (4.54)
 methylenebis(2-chloro-.                       chloroaniline).                                                                                          
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzeneacetic acid, 4-chloro-         510156  Chlorobenzilate...............           1*           3,4  U038           A                      10 (4.54)
 -(4-chlorophenyl)-                                                                                                                            
 -hydroxy-, ethyl                                                                                                                              
 ester.                                                                                                                                                 
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, chloro-...............       108907  Chlorobenzene.................          100       1,2,3,4  U037           B                     100 (45.4)
[[Page 30946]]
                                                                                                                                                        
Benzene, chloromethyl-.........       100447  Benzyl chloride...............          100         1,3,4  P028           B                     100 (45.4)
Benzenediamine, ar-methyl-.....        95807  Toluenediamine................           1*           3,4  U221           A                      10 (4.54)
                                      496720  2,4-Toluene diamine...........  ...........  ............  .............  .............  .................
                                      823405  ..............................  ...........  ............  .............  .............  .................
                                    25376458  ..............................  ...........  ............  .............  .............  .................
1,2-Benzenedicarboxylic acid,          84742  n-Butyl phthalate.............          100       1,2,3,4  U069           A                      10 (4.54)
 dibutyl ester.                               Dibutyl phthalate                                                                                         
                                              Di-n-butyl phthalate                                                                                      
1,2-Benzenedicarboxylic acid,         131113  Dimethyl phthalate............           1*         2,3,4  U102           D                    5000 (2270)
 dimethyl ester.                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,2-Benzenedicarboxylic acid,         117817  Bis(2-ethylhexyl)phthalate....           1*         2,3,4  U028           B                     100 (45.4)
 bis(2-ethylhexyl) ester.                     DEHP                                                                                                      
                                              Diethylhexyl phthalate                                                                                    
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, 1,4-dichloro-.........       106467  p-Dichlorobenzene.............          100       1,2,3,4  U072           B                     100 (45.4)
                                              1,4-Dichlorobenzene                                                                                       
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, 1,3-diisocyanatomethyl-       91087  Toluene diisocyanate..........           1*           3,4  U223           B                     100 (45.4)
 .                                                                                                                                                      
                                      584849  2,4-Toluene diisocyanate......  ...........  ............  .............  .............  .................
                                    26471625  ..............................  ...........  ............  .............  .............  .................
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, hexachloro-...........       118741  Hexachlorobenzene.............           1*         2,3,4  U127           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, hydroxy-..............       108952  Phenol........................         1000       1,2,3,4  U188           C                     1000 (454)
Benzene, methyl-...............       108883  Toluene.......................         1000       1,2,3,4  U220           C                     1000 (454)
Benzene, 1-methyl-2,4-dinitro-.       121142  2,4-Dinitrotoluene............         1000       1,2,3,4  U105           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, (1-methylethyl)-......        98828  Cumene........................           1*           3,4  U055           D                    5000 (2270)
Benzene, nitro-................        98953  Nitrobenzene..................         1000       1,2,3,4  U169           C                     1000 (454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, pentachloronitro-.....        82688  PCNB..........................           1*           3,4  U185           B                     100 (45.4)
                                              Pentachloronitrobenzene                                                                                   
                                              Quintobenzene                                                                                             
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzene, 1,1'-(2,2,2-                  72435  Methoxychlor..................            1         1,3,4  U247           X                      1 (0.454)
 trichloroethylidene) bis[4-                                                                                                                            
 methoxy-.                                                                                                                                              
Benzene, (trichloromethyl)-....        98077  Benzotrichloride..............           1*           3,4  U023           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzidine......................        92875  [1,1'-Biphenyl]-4,4'-diamine..           1*         2,3,4  U021           X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
-Benzoquinone.........       106514  2,5-Cyclohexadiene-1,4-dione             1*           3,4  U197           A                      10 (4.54)
                                               Quinone.                                                                                                 
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzotrichloride...............        98077  Benzene, (trichloromethyl)-...           1*           3,4  U023           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Benzyl chloride................       100447  Benzene, chloromethyl-........          100         1,3,4  P028           B                     100 (45.4)
                                                                                                                                                        
[[Page 30947]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
BERYLLIUM AND COMPOUNDS........         N.A.  Beryllium Compounds...........           1*           2,3  .............  .............               (**)
Beryllium Compounds............         N.A.  BERYLLIUM AND COMPOUNDS.......           1*           2,3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
-BHC..................        58899  Cyclohexane, 1,2,3,4,5,6-hexa             1       1,2,3,4  U129           X                      1 (0.454)
                                               chloro- (1, 2, 3,4,5,6)-.                                                                              
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2-Butanone.....................        78933  MEK...........................           1*           3,4  U159           D                    5000 (2270)
-Butyl phthalate.....        84742  1,2-Benzenedicarboxylic acid,           100       1,2,3,4  U069           A                      10 (4.54)
                                               dibutyl ester.                                                                                           
                                              Dibutyl phthalate                                                                                         
                                              Di-n-butyl phthalate                                                                                      
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
CADMIUM AND COMPOUNDS..........         N.A.  Cadmium Compounds.............           1*           2,3  .............  .............               (**)
Cadmium Compounds..............         N.A.  CADMIUM AND COMPOUNDS.........           1*           2,3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Camphene, octachloro-..........      8001352  Chlorinated camphene Toxaphene            1       1,2,3,4  P123           X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Captan.........................       133062  ..............................           10           1,3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbamic acid, ethyl ester.....        51796  Ethyl carbamate Urethane......           1*           3,4  U238           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbamic chloride, dimethyl-...        79447  Dimethylcarbamoyl chloride....           1*           3,4  U097           X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbaryl.......................        63252  ..............................          100           1,3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbon disulfide...............        75150  ..............................         5000         1,3,4  P022           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbonic dichloride............        75445  Phosgene......................         5000         1,3,4  P095           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Carbon tetrachloride...........        56235  Methane, tetrachloro-.........         5000       1,2,3,4  U211           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chlordane......................        57749  Chlordane, alpha & gamma                  1       1,2,3,4  U036           X                      1 (0.454)
                                               isomers.                                                                                                 
                                              CHLORDANE (TECHNICAL MIXTURE                                                                              
                                               AND                                                                                                      
                                                METABOLITES)                                                                                            
                                              4,7-Methano-1H-indene,                                                                                    
                                               1,2,4,5,6,7,8,8-                                                                                         
                                                octachloro-2,3,3a,4,7,7a-                                                                               
                                               hexahydro-.                                                                                              
                                                                                                                                                        
[[Page 30948]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chlordane, alpha & gamma               57749  Chlordane.....................            1       1,2,3,4  U036           X                      1 (0.454)
 isomers.                                     CHLORDANE (TECHNICAL MIXTURE                                                                              
                                               AND METABOLITES) l4,7-Methano-                                                                           
                                               1H-indene, 1,2,4,5,6,7,8,8-                                                                              
                                                octachloro-2,3,3a,4,7,7a-                                                                               
                                               hexahydro-.                                                                                              
CHLORDANE (TECHNICAL MIXTURE           57749  Chlordane, alpha & gamma                  1       1,2,3,4  U036           X                      1 (0.454)
 AND METABOLITES).                             isomers.                                                                                                 
                                              Chlordane, alpha & gamma                                                                                  
                                               isomers                                                                                                  
                                              4,7-Methano-1H-indene,                                                                                    
                                               1,2,4,5,6,7,8,8-                                                                                         
                                                octachloro-2,3,3a,4,7,7a-                                                                               
                                               hexahydro-                                                                                               
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chlorinated camphene...........      8001352  Camphene, octachloro-Toxaphene            1       1,2,3,4  P123           X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chlorine.......................      7782505  ..............................           10           1,3  .............  A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chlorobenzene..................       108907  Benzene, chloro-..............          100       1,2,3,4  U037           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chlorobenzilate................       510156  Benzeneacetic acid, 4-chloro-            1*           3,4  U038           A                      10 (4.54)
                                               -(4-chlorophenyl)-                                                                              
                                               -hydroxy-, ethyl                                                                                
                                               ester.                                                                                                   
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1-Chloro-2,3-epoxypropane......       106898  Epichlorohydrin Oxirane,               1000         1,3,4  U041           B                     100 (45.4)
                                               (chloromethyl)-.                                                                                         
Chloroethane...................        75003  Ethyl chloride................           1*           2,3  .............  B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Chloroform.....................        67663  Methane, trichloro-...........         5000       1,2,3,4  U044           A                      10 (4.54)
Chloromethane..................        74873  Methane, chloro-Methyl                   1*         2,3,4  U045           B                     100 (45.4)
                                               chloride.                                                                                                
Chloromethyl methyl ether......       107302  Methane, chloromethoxy-.......           1*           3,4  U046           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
CHROMIUM AND COMPOUNDS.........         N.A.  Chromium Compounds............           1*           2,3  .............  .............               (**)
Chromium Compounds.............         N.A.  CHROMIUM AND COMPOUNDS........           1*           2,3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Cumene.........................        98828  Benzene, (1-methylethyl)-.....           1*           3,4  U055           D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Cyanide Compounds..............         N.A.  CYANIDES......................           1*           2,3  .............  .............               (**)
CYANIDES.......................         N.A.  Cyanide Compounds.............           1*           2,3  .............  .............               (**)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,5-Cyclohexadiene-1,4-dione...       106514  p-Benzoquinone Quinone........           1*           3,4  U197           A                      10 (4.54)
                                                                                                                                                        
[[Page 30949]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Cyclohexane, 1,2,3,4,5,6-              58899  -BHC.................            1       1,2,3,4  U129           X                      1 (0.454)
 hexachloro-, (1,2,3,4,6)-.                   Lindane.......................                                                                            
                                              Lindane (all isomers).........                                                                            
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,3-Cyclopentadiene,                   77474  Hexachlorocyclopentadiene.....            1       1,2,3,4  U130           A                      10 (4.54)
 1,2,3,4,5,5-hexachloro-.                                                                                                                               
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,4-D Acid.....................        94757  Acetic acid, (2,4-                      100         1,3,4  U240           B                     100 (45.4)
                                               dichlorophenoxy)-, salts &                                                                               
                                               esters.                                                                                                  
                                              2,4-D, salts and esters                                                                                   
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,4-D salts and esters.........        94757  Acetic acid, (2,4-                      100         1,3,4  U240           B                     100 (45.4)
                                               dichlorophenoxy)-, salts &                                                                               
                                               esters.                                                                                                  
                                              2,4-D Acid                                                                                                
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
DDE............................        72559  4,4'-DDE......................           1*           2,3  .............  X                      1 (0.454)
4,4'-DDE.......................        72559  DDE...........................           1*           2,3  .............  X                      1 (0.454)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
DEHP...........................       117817  1,2-Benzenedicarboxylic acid,            1*         2,3,4  U028           B                     100 (45.4)
                                               bis(2-ethyl-hexyl) ester.                                                                                
                                              Bis(2-ethylhexyl)phthalate                                                                                
                                              Diethylhexyl phthalate                                                                                    
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,2-Dibromo-3-chloropropane....        96128  Propane, 1,2-dibromo-3-chloro-           1*           3,4  U066           X                      1 (0.454)
Dibromoethane..................       106934  Ethane, 1,2-dibromo-Ethylene           1000         1,3,4  U067           X                      1 (0.454)
                                               dibromide.                                                                                               
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dibutyl phthalate..............        84742  1,2-Benzenedicarboxylic acid,           100       1,2,3,4  U069           A                      10 (4.54)
                                               dibutyl ester.                                                                                           
                                              n-Butyl phthalate                                                                                         
                                              Di-n-butyl phthalate                                                                                      
Di-n-butyl phthalate...........        84742  1,2-Benzenedicarboxylic acid,           100       1,2,3,4  U069           A                      10 (4.54)
                                               dibutyl ester.                                                                                           
                                              n-Butyl phthalate                                                                                         
                                              Dibutyl phthalate                                                                                         
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,4-Dichlorobenzene............       106467  Benzene, 1,4-dichloro-........          100       1,2,3,4  U072           B                     100 (45.4)
                                              p-Dichlorobenzene                                                                                         
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
p-Dichlorobenzene..............       106467  Benzene, 1,4-dichloro-........          100       1,2,3,4  U072           B                     100 (45.4)
                                              1,4-Dichlorobenzene                                                                                       
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
3,3'-Dichlorobenzidine.........        91941  [1,1'-Biphenyl]-4,4'-                    1*         2,3,4  U073           X                      1 (0.454)
                                               diamine,3,3'-dichloro-.                                                                                  
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,1-Dichloroethane.............        75343  Ethane, 1,1-dichloro-.........           1*         2,3,4  U076           C                     1000 (454)
                                              Ethylidene dichloride                                                                                     
1,2-Dichloroethane.............       107062  Ethane, 1,2-dichloro-.........         5000       1,2,3,4  U077           B                     100 (45.4)
                                              Ethylene dichloride                                                                                       
[[Page 30950]]
                                                                                                                                                        
1,1-Dichloroethylene...........        75354  Ethene, 1,1-dichloro-.........         5000       1,2,3,4  U078           B                     100 (45.4)
                                              Vinylidene chloride                                                                                       
Dichloroethyl ether............       111444  Bis(2-chloroethyl) ether......           1*         2,3,4  U025           A                      10 (4.54)
                                              Ethane, 1,1'-oxybis[2-chloro-                                                                             
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dichloromethyl ether...........       542881  Bis(chloromethyl) ether.......            1           3,4  P016           A                      10 (4.54)
                                              Methane, oxybis(chloro-                                                                                   
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dichloromethane................        75092  Methane, dichoro-.............            1         2,3,4  U080           C                     1000 (454)
                                              Methylene chloride                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,2-Dichloropropane............        78875  Propane, 1,2-dichloro-........         5000      1,2,3,4,  U083           C                     1000 (454)
                                              Propylene dichloride                                                                                      
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,3-Dichloropropane............       542756  1-Propene, 1,3-dichloro-......         5000       1,2,3,4  U084           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dichlorvos.....................        62737    ............................           10           1,3                 A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,4-Diethyleneoxide............       123911  1,4-Dioxane...................            1           3,4  U108           B                     100 (45.4)
                                              1,4-Diethylenedioxide                                                                                     
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,4-Diethylenedioxide..........       123911  1,4-Dioxane...................            1           3,4  U108           B                     100 (45.4)
                                              1,4-Diethyleneoxide                                                                                       
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Diethylhexyl phthalate.........       117817  1,2-Benzenedicarboxylic acid,             1         2,3,4  U028           B                     100 (45.4)
                                               bis(2-ethylhexyl) ester.                                                                                 
                                              Bis(2-ethylhexyl)phthalate                                                                                
                                               DEHP                                                                                                     
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
3,3'-Dimethoxybenzidine........       119904  [1,1'-Biphenyl]-4,4'-                     1           3,4  U091           B                     100 (45.4)
                                               diamine,3,3'-dimethoxy-.                                                                                 
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dimethyl aminoazobenzene.......        60117  Benzenamine, N,N-dimethyl-4-              1           3,4  U093           A                      10 (4.54)
                                               (phenylazo-).                                                                                            
                                              P-Dimethylaminoazobenzene                                                                                 
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
p-Dimethylaminoazobenzene......        60117  Benzenamine, N,N-dimethyl-4-              1           3,4  U093           A                      10 (4.54)
                                               (phenylazo-).                                                                                            
                                              Dimethyl aminoazobenzene                                                                                  
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
3,3'-Dimethylbenzidine.........       119937  [1,1'-Biphenyl]-4,4'-                     1           3,4  U095           A                      10 (4.54)
                                               diamine,3,3'-dimethyl-.                                                                                  
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dimethylcarbamoyl chloride.....        79447  Carbamic chloride, dimethyl-..            1           3,4  U097           X                      1 (0.454)
                                                                                                                                                        
                                                                                                                                                        
[[Page 30951]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,1-Dimethylhydrazine..........        57147  Hydrazine, 1,1-dimethyl-......            1           3,4  U098           A                      10 (4.54)
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dimethyl phthalate.............       131113  1,2-Benzenedicarboxylic acid,             1         2,3,4  U102           D                    5000 (2270)
                                               dimethyl ester.                                                                                          
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Dimethyl sulfate...............        77781  Sulfuric acid, dimethyl ester.            1           3,4  U103           B                     100 (45.4)
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
4,6-Dinitro-o-cresol, and salts       534521  Phenol, 2-methyl-4,6-dinitro-,            1         2,3,4  P047           A                      10 (4.54)
                                               & salts.                                                                                                 
                                                                                                                                                        
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,4-Dinitrophenol..............        51285  Phenol, 2,4-dinitro-..........         1000      1,2,3,4,  P048           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,4-Dinitrotoluene.............       121142  Benzene, 1-methyl-2,4-dinitro-         1000       1,2,3,4  U105           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
1,4-Dioxane....................       123911  1,4-Diethyleneoxide...........            1           3,4  U108           B                     100 (45.4)
                                              1,4-Diethlyenedioxide                                                                                     
1,2-Diphenyl-..................       122667  Hydrazine, 1,2-diphenyl-......           1*         2,3,4  U109           A                       10(4.54)
hydrazine                                                                                                                                               
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Epichlorohydrin................       106898  1-Chloro-2,3-epoxypropane.....         1000         1,3,4  U041           B                      100(45.4)
                                              Oxirane, (chloromethyl)-                                                                                  
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethanal........................        75070  Acetaldehyde..................         1000         1,3,4  U001           C                      1000(454)
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethane, 1,2-dibromo............       106934  Dibromoethane.................         1000         1,3,4  U067           X                       1(0.454)
                                              Ethylene dibromide                                                                                        
Ethane, 1,1-dichloro...........        75343  1,1-Dichloroethane............           1*         2,3,4  U076           C                      1000(454)
                                              Ethylidene dichloride                                                                                     
Ethane, 1,2-dichloro...........       107062  1,2-Dichloroethane............         5000       1,2,3,4  U077           B                      100(45.4)
                                              Ethylene dichloride                                                                                       
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethane, hexachloro-............        67721  Hexachloroethane..............           1*         2,3,4  U131           B                      100(45.4)
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethane, 1,1'-oxybis[2-chloro-..       111444  Bis(2-chloroethyl) ether......           1*         2,3,4  U025           A                       10(4.54)
                                              Dichloroethyl ether                                                                                       
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethane, 1,1,2,2-tetrachloro-...        79345  1,1,2,2-Tetra-................           1*         2,3,4  U209           B                      100(45.4)
                                              chloroethane                                                                                              
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethane, 1,1,1-trichloro-.......        71556  Methyl chloroform.............           1*         2,3,4  U226           C                      1000(454)
                                              1,1,1-Trichloroethane                                                                                     
Ehane, 1,1,2-trichloro-........        79005  1,1,2-Trichloroethane.........           1*         2,3,4  U227           B                      100(45.4)
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethanone, 1-phenyl-............        98862  Acetophenone..................           1*           3,4  U004           D                     5000(2270)
                                                                                                                                                        
[[Page 30952]]
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethene, 1,1-dichloro-..........        75354  1,1-Dichloroethylene..........         5000       1,2,3,4  U078           B                      100(45.4)
                                              Vinylidene chloride                                                                                       
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethene, tetrachloro-...........       127184  Perchloroethylene.............           1*         2,3,4  U210           B                      100(45.4)
                                              Tetrachloroethene                                                                                         
                                              Tetrachloroethylene                                                                                       
Ethene, trichloro-.............        79016  Trichloroethene...............         1000       1,2,3,4  U228           B                      100(45.4)
                                              Trichloroethylene                                                                                         
Ethyl acrylate.................       140885  2-Propenoic acid, ethyl ester.           1*           3,4  U113           C                      1000(454)
Ethylbenzene...................       100414  ..............................         1000         1,2,3  .............  C                      1000(454)
Ethyl carbamate................        51796  Carbamic acid, ethyl ester....           1*           3,4  U238           B                      100(45.4)
                                              Urethane                                                                                                  
Ethyl chloride.................        75003  Chloroethane..................           1*           2,3  .............  B                      100(45.4)
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethylene dibromide.............       106934  Dibromoethane.................         1000         1,3,4  U067           X                       1(0.454)
                                              Ethane, 1,2-dibromo-                                                                                      
Ethylene dichloride............       107062  1,2-Dichloroethane............         5000       1,2,3,4  U077           B                      100(45.4)
                                              Ethane, 1,2-dichloro-                                                                                     
                                                                                                                                                        
                            *                  *                  *                  *                  *                  *                            
Ethyleneimine..................       151564  Aziridine.....................           1*           3,4  P054           X                       1(0.454)
Ethylene oxide.................        75218  Oxirane.......................           1*           3,4  U115           A                       10(4.54)
Ethylenethiourea...............        96457  2-Imidazolidinethione.........           1*           3,4  U116           A                       10(4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Ethylidene dichloride..........        75343  1,1-Dichloroethane............            *         2,3,4  U076           C                     1000 (454)
                                              Ethane, 1,1-dichloro-                                                                                     
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Formaldehyde...................        50000  ..............................         1000         1,3,4  U122           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2,5-Furandione.................       108316  Malleic anhydride.............         5000         1,3,4  U147           D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Heptachlor.....................        76448  4,7-Methano-1H-indene,                    1       1,2,3,4  P059           X                     1, (0.454)
                                               1,4,5,6,7,8,8-.                                                                                          
                                                heptachloro-3a,4,7,7a-                                                                                  
                                               tetrahydro-                                                                                              
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hexachlorobenzene..............       118741  Benzene, hexachloro-..........           1*         2,3,4  U127           A                      10 (4.54)
Hexachlorobutadiene............        87683  1,3-Butadiene 1,1,2,3,4,4-               1*         2,3,4  U128           X                      1 (0.454)
                                               hexachloro-.                                                                                             
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hexachlorocyclohexane (gamma           58899  -BHC.................            1       1,2,3,4  U129           X                      1 (0.454)
 isomer).                                     Chclohexane, 1,2,3,4,5,6-                                                                                 
                                               hexachloro-                                                                                              
                                              (1,2,3, 5,6)-                                                                                          
                                              Lindane                                                                                                   
                                              Lindane (all isomers)                                                                                     
Hexachlorocyclopentadiene......        77474  1,3-Cyclopentadiene,                      1       1,2,3,4  U130           A                      10 (4.54)
                                               1,2,3,4,5,5-hexachloro-.                                                                                 
Hexachloroethane...............        67721  Ethane, hexachloro-...........           1*         2,3,4  U131           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hexone.........................       108101  Methyl isobutyl ketone........           1*           3,4  U161           D                    5000 (2270)
                                              4-Methyl-2-pentanone                                                                                      
Hydrazine......................       302012  ..............................           1*           3,4  U133           X                      1 (0.454)
                                                                                                                                                        
[[Page 30953]]
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrazine, 1,1-dimethyl-.......        57147  1,1-Dimethylhydra-............           1*           3,4  U098           A                      10 (4.54)
                                                zine                                                                                                    
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrazine, 1,2-diphenyl-.......       122667  1,2-Diphenylhydra-............           1*         2,3,4  U109           A                      10 (4.54)
                                                zine                                                                                                    
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrazine, methyl-.............        60344  Methyl hydrazine..............           1*           3,4  P068           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrochloric acid..............      7647010  Hydrogen chloride.............         5000           1,3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrofluoric acid..............      7664393  Hydrogen fluoride.............         5000         1,3,4  U134           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrogen chloride..............      7647010  Hydrochloric acid.............         5000           1,3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Hydrogen fluoride..............      7664393  Hydrofluoric acid.............         5000         1,3,4  U134           B                     100 (45.4)
Hydrogen phosphide.............      7803512  Phosphine.....................           1*           3,4  P096           B                     100 (45.4)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
2-Imidazolidinethione..........        96457  Ethylenethiourea..............           1*           3,4  U116           A                      10 (4.54)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Iodomethane....................        74884  Methane, iodo-................           1*           3,4  U138           B                     100 (45.4)
                                              Methyl iodide                                                                                             
1,3-Isobenzofurandione.........        85449  Phthalic anhydride............           1*           3,4  U190           D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
Isophorone.....................        78591  ..............................           1*           2,3  .............  D                    5000 (2270)
                                                                                                                                                        
                   *                  *                  *                  *                  *                  *                  *                  
LEAD AND COMPOUNDS.............         N.A.  Lead Compounds................           1*           2,3  .............  .............                (*)
Lead Compounds.................         N.A.  LEAD AND COMPOUNDS............           1*           2,3  .............  .............               (**)
                                                                                                                                                        
                *                   *                   *                   *                   *                   *                   *               
Lindane........................        58899  -BHC.................            1       1,2,3,4  U129           X                      1 (0.454)
                                              Cyclohexane, 1,2,3,4,5,6-                                                                                 
                                               hexachloro-,                                                                                             
                                              (1,2,                                                                                   
                                               3,4,5)-,                                                                                          
                                              Hexachlorocyclo-                                                                                          
                                                hexane (gamma isomer)                                                                                   
                                              Lindane (all isomers)                                                                                     
Lindane (all isomers)..........        58899  -BHC.................            1       1,2,3,4  U129           X                      1 (0.454)
                                              Cyclohexane, 1,2,3,4,5,6-                                                                                 
                                               hexachloro-,                                                                                             
                                              (1,2,3,5,6 Indicates the statutory source as defined by 1,2,3, and 4 below.                                                                               
*                  *                  *                  *                  *                  *                  *                                     
1- Indicates that the statutory source for designation of this hazardous substance under CERCLA is CWA section 311(b)(4).                               
2- Indicates that the statutory source for designation of this hazardous substance under CERCLA is CWA section 307(a).                                  
3- Indicates that the statutory source for designation of this hazardous substance under CERCLA is CAA section 112.                                     
4- Indicates that the statutory source for designation of this hazardous substance under CERCLA is RCRA section 3001.                                   
\1\ Indicates that the 1-pound RQ is a CERCLA statutory RQ.                                                                                             
*                  *                  *                  *                  *                  *                  *                                     
**Indicates that no RQ is being assigned to the generic or broad class.                                                                                 


   Appendix A to Sec.  302.4.--Sequential CAS Registry Number List of   
                       CERCLA Hazardous Substances                      
------------------------------------------------------------------------
   CASRN                         Hazardous substance                    
------------------------------------------------------------------------
                                                                        
*                  *                  *                  *              
51796......  Carbamic acid, ethyl ester Ethyl carbamate Urethane.       
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
57749......  Chlordane Chlordane, alpha & gamma isomers CHLORDANE       
              (TECHNICAL MIXTURE AND METABOLITES) 4,7-Methano-1H-indene,
              1,2,4,5,6,7,8,8- octachloro-2,3,3a,4,7,7a-hexahydro-.     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
58899......  -BHC Cyclohexane, 1,2,3,4,5,6-hexachloro (1,2,3,4,5,6)-
               Hexachlorocyclohexane (gamma isomer) Lindane Lindane (all
              isomers).                                                 
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
60117......  Benzenamine, N,N-dimethyl-4-(phenylazo-) Dimethyl          
              aminoazobenzene p-Dimethylaminoazobenzene.                
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
72559......  DDE 4,4'-DDE.                                              
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
74839......  Bromomethane Methane, bromo- Methyl bromide.               
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
74873......  Chloromethane Methane, chloro- Methyl chloride.            
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
74884......  Iodomethane Methane, iodo- Methyl iodide.                  
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
75003......  Chloroethane Ethyl chloride.                               
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
75092......  Dichloromethane Methane, dichloro- Methylene chloride.     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
75252......  Bromoform Methane, tribromo-.                              
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
75558......  Aziridine, 2-methyl- 2-Methyl aziridine 1,2-Propylenimine. 
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
78933......  2-Butanone MEK Methyl ethyl ketone.                        
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
82688......  Benzene, pentachloronitro- PCNB Pentachloronitrobenzene    
              Quintobenzene.                                            
                                                                        
[[Page 30960]]
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
91087......  Benzene, 1,3-diisocyanatomethyl- Toluene diisocyanate 2,4- 
              Toluene diisocyanate.                                     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
92875......  Benzidine [1,1'-Biphenyl]-4,4'diamine.                     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
94757......  Acetic acid (2,4-dichlorophenoxy)-, salts & esters 2,4-D   
              Acid 2,4-D, salts and esters.                             
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
95807......  Benzenediamine, ar-methyl- Toluenediamine 2,4-Toluene      
              diamine.                                                  
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
98828......  Benzene, (1-methylethyl)- Cumene.                          
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
106514.....  p-Benzoquinone 2,5-Cyclohexadiene-1,4-dione Quinone.       
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
106898.....  1-Chloro-2,3-epoxypropane Epichlorohydrin Oxirane,         
              (chloromethyl)-.                                          
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
106934.....  Dibromoethane Ethane, 1,2-dibromo- Ethylene, dibromide.    
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
117817.....  1,2-Benzenedicarboxylic acid, bis(2-ethylhexyl) ester Bis(2-
              ethylhexyl)phthalate DEHP Diethylhexyl phthalate.         
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
123911.....  1,4-Diethyleneoxide 1,4-Diethylenedioxide 1,4-Dioxane.     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
131113.....  Dimethyl phthalate 1,2-Benzenedicarboxylic acid, dimethyl  
              ester.                                                    
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
151564.....  Aziridine Ethyleneimine.                                   
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
496720.....  Benzenediamine, ar-methyl- Toluenediamine 2,4-Toluene      
              diamine.                                                  
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
510156.....  Benzeneacetic acid, 4-chloro-- (4-chlorophenyl)-  
              -hydroxy-, ethyl ester Chlorobenzilate.          
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
534521.....  4,6-Dinitro-o-cresol, and salts Phenol, 2-methyl-4,6-      
              dinitro-, & salts.                                        
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
542881.....  Bis(chloromethyl)ether Dichloromethyl ether Methane,       
              oxybis(chloro)-.                                          
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
584849.....  Benzene, 1,3-diisocyanatomethyl- Toluene diisocyanate 2,4- 
              Toluene diisocyanate.                                     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
823405.....  Benzenediamine, ar-methyl- Toluenediamine 2,4-Toluene      
              diamine.                                                  
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
1336363....  Aroclors PCBs POLYCHLORINATED BIPHENYLS.                   
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
1746016....  TCDD 2,3,7,8-Tetrachlorodibenzo-p-dioxin.                  
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
7803512....  Hydrogen phosphide Phosphine.                              
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
8001352....  Camphene, octachloro- Chlorinated camphene Toxaphene.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
11096825...  Aroclor 1260 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
11097691...  Aroclor 1254 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
[[Page 30961]]
                                                                        
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
11104282...  Aroclor 1221 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
11141165...  Aroclor 1232 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
12672296...  Aroclor 1248 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
12674112...  Aroclor 1016 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
25376458...  Benzenediamine, ar-methyl- Toluenediamine 2,4-Toluene      
              diamine.                                                  
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
26471625...  Benzene, 1,3-diisocyanatomethyl- Toluene diisocyanate 2,4- 
              Toluene diisocyanate.                                     
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
53469219...  Aroclor 1242 Aroclors PCBs POLYCHLORINATED BIPHENYLS.      
                                                                        
*                  *                  *                  *              
                  *                  *                  *               
------------------------------------------------------------------------

PART 355--EMERGENCY PLANNING AND NOTIFICATION

    6. The authority citation for part 355 continues to read as 
follows:

    Authority: 42 U.S.C. 11002, 11004, and 11048.

    7. Part 355 is amended by revising the following entries in 
Appendices A and B, to read as set forth below:
* * * * *

   Appendix A To Part 355.--The List of Extremely Hazardous Substances and Their Threshold Planning Quantities  
                                              [Alphabetical order]                                              
----------------------------------------------------------------------------------------------------------------
                                                                                                     Threshold  
                                                                                      Reportable     planning   
  CAS No.                          Chemical name                           Notes      quantity*      quantity   
                                                                                       (pounds)      (pounds)   
----------------------------------------------------------------------------------------------------------------
                                                                                                                
*                  *                  *                  *                  *                  *                
79-11-8....  Chloroacetic Acid........................................  ...........          100      100/10,000
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
95-48-7....  Cresol, o-...............................................  ...........          100    1,000/10,000
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
123-31-9...  Hydroquinone.............................................            l          100      500/10,000
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
57-57-8....  Propiolactone, Beta-.....................................  ...........           10             500
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
7550-45-0..  Titanium Tetrachloride...................................  ...........        1,000             100
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
----------------------------------------------------------------------------------------------------------------
* Only the statutory or final RQ is shown. For more information, see 40 CFR table 302.4.                        
Notes:                                                                                                          
*                  *                  *                  *                  *                  *                
   *                                                                                                            
 Chemicals on the original list that do not meet toxicity criteria but because of their high production volume  
  and recognized toxicity are considered chemicals of concern (``Other chemicals'').                            
*                  *                  *                  *                  *                  *                
   *                                                                                                            


                                                                                                                
[[Page 30962]]
   Appendix B To Part 355.--The List of Extremely Hazardous Substances and Their Threshold Planning Quantities  
                                               [CAS number order]                                               
----------------------------------------------------------------------------------------------------------------
                                                                                                     Threshold  
                                                                                      Reportable     planning   
  CAS No.                          Chemical name                           Notes      quantity*      quantity   
                                                                                       (pounds)      (pounds)   
----------------------------------------------------------------------------------------------------------------
                                                                                                                
*                  *                  *                  *                  *                  *                
57-57-8....  Propiolactone, Beta-.....................................  ...........           10             500
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
79-11-8....  Chloroacetic Acid........................................  ...........          100      100/10,000
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
95-48-7....  Cresol, o-...............................................  ...........          100    1,000/10,000
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
123-31-9...  Hydroquinone.............................................            l          100      500/10,000
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
7550-45-0..  Titanium Tetrachloride...................................  ...........        1,000             100
                                                                                                                
*                  *                  *                  *                  *                  *                
                                                        *                                                       
----------------------------------------------------------------------------------------------------------------
* Only the statutory or final RQ is shown. For more information, see 40 CFR table 302.4.                        
Notes:                                                                                                          
*                  *                  *                  *                  *                  *                
   *                                                                                                            
 Chemicals on the original list that do not meet toxicity criteria but because of their high production volume  
  and recognized toxicity are considered chemicals of concern (``Other chemicals'').                            
*                  *                  *                  *                  *                  *                
   *                                                                                                            

[FR Doc. 95-13787 Filed 6-9-95; 8:45 am]
BILLING CODE 6560-50-P