[Federal Register Volume 64, Number 141 (Friday, July 23, 1999)]
[Proposed Rules]
[Pages 40192-40230]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-17495]



[[Page 40191]]

_______________________________________________________________________

Part VI





Environmental Protection Agency





_______________________________________________________________________



40 CFR Parts 148, 261 et al.



Hazardous Waste Management System; Identification and Listing of 
Hazardous Waste; Dye and Pigment Industries; Land Disposal Restrictions 
for Newly Identified Wastes; CERCLA Hazardous Substance Designation and 
Reportable Quantities; Proposed Rule

  Federal Register / Vol. 64, No. 141 / Friday, July 23, 1999 / 
Proposed Rules  

[[Page 40192]]



ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 148, 261, 268, 271, and 302

[SWH-FRL-6373-4]
RIN 2050-AD80


Hazardous Waste Management System; Identification and Listing of 
Hazardous Waste; Dye and Pigment Industries; Land Disposal Restrictions 
for Newly Identified Wastes; CERCLA Hazardous Substance Designation and 
Reportable Quantities

AGENCY: Environmental protection agency (EPA).

ACTION: Notice of Proposed Rulemaking.

-----------------------------------------------------------------------

SUMMARY: The EPA is proposing to list two of three wastes from the dyes 
and pigment industries as hazardous wastes under the Resource, 
Conservation, and Recovery Act (RCRA), which direct EPA to determine 
whether certain wastes from the dye and pigment industries present a 
hazard to human health or the environment. The effect of listing these 
wastes will be to subject them to stringent management and treatment 
standards and to emergency notification requirements if there are 
releases of these hazardous wastes to the environment. EPA is proposing 
concentration-based listings for the two wastes, such that waste 
generators have the option of determining that their specific waste is 
nonhazardous. To have their waste classified as nonhazardous, 
generators must determine the levels of constituents in their wastes, 
and certify to EPA that their wastes are below the regulatory levels of 
concern.

DATES: EPA will accept public comments on this proposed rule until 
September 21, 1999; comments postmarked after this date will be marked 
``late'' and may not be considered. Any person may request a public 
hearing on this proposal by filing a request with Mr. David Bussard, 
whose address appears below, by August 6, 1999.

ADDRESSES: If you wish to comment on this proposed rule, you must send 
an original and two copies of the comments referencing docket number F-
1999-DPIP-FFFFF to: RCRA Docket Information Center, Office of Solid 
Waste (5305G), U.S. Environmental Protection Agency Headquarters (EPA, 
HQ), 401 M Street, SW, Washington, DC 20460. Hand deliveries of 
comments should be made to the Arlington, VA, address listed below. You 
may also submit comments electronically by sending electronic mail 
through the Internet to: [email protected]. See the beginning 
of Supplementary Information for instructions on electronic submission.
    You should not submit electronically any confidential business 
information (CBI). You must submit an original and two copies of CBI 
under separate cover to: RCRA CBI Document Control Officer, Office of 
Solid Waste (5305W), U.S. EPA, 401 M Street, SW, Washington, DC 20460. 
See the beginning of Supplementary Information for information of 
viewing public comments and supporting materials.
    Address requests for a hearing to Mr. David Bussard at: Office of 
Solid Waste, Hazardous Waste Identification Division (5304W), U.S. 
Environmental Protection Agency 401 M Street, SW, Washington, DC 20460, 
(703)308-8880.

FOR FURTHER INFORMATION CONTACT: For general information, contact the 
RCRA Hotline at (800) 424-9346 or TDD (800) 553-7672 (hearing 
impaired). In the Washington, DC, metropolitan area, call (703) 412-
9810 or TDD (703) 412-3323. For information on specific aspects of the 
rule, contact Narendra Chaudhari or Robert Kayser, Office of Solid 
Waste (5304W), U.S. Environmental Protection Agency, 401 M Street, SW, 
Washington, DC 20460. [E-mail addresses and telephone numbers:

[email protected], (703) 308-0454;
[email protected], (703) 308-7304)].

SUPPLEMENTARY INFORMATION: You should identify comments in electronic 
format with the docket number F-1999-DPIP-FFFFF. You must submit all 
electronic comments as an ASCII (text) file, avoiding the use of 
special characters and any form of encryption. If you do not submit 
comments electronically, EPA is asking prospective commenters to 
voluntarily submit one additional copy of their comments on labeled 
personal computer diskettes in ASCII (text) format or a word processing 
format that can be converted to ASCII (text). It is essential to 
specify on the disk label the word processing software and version/
edition as well as the commenter's name. This will allow EPA to convert 
the comments into one of the word processing formats utilized by the 
Agency. Please use mailing envelopes designed to physically protect the 
submitted diskettes. EPA emphasizes that submission of comments on 
diskettes is not mandatory, nor will it result in any advantage or 
disadvantage to any commenter. Supporting documents in the docket for 
this Notice are also available in electronic format on the Internet. 
Follow these instructions to access these documents.

WWW: http://www.epa.gov/epaoswer/hazwaste/id
FTP: ftp.epa/gov
Login: anonymous
Password: your Internet address
Files are located in /pub/gopher/OSWRCRA.

    EPA will keep the official record for this action in paper form. 
Accordingly, we will transfer all comments received electronically into 
paper form and place them in the official record, which will also 
include all comments submitted directly in writing. The official record 
is the paper record maintained at the address in ADDRESSES at the 
beginning of this document.
    EPA responses to comments, whether the comments are written or 
electronic, will be in a notice in the Federal Register or in a 
response to comments document placed in the official record for this 
rulemaking. We will not immediately reply to commenters electronically 
other than to seek clarification of electronic comments that may be 
garbled in transmission or during conversion to paper form, as 
discussed above.
    You may view public comments and supporting materials in the RCRA 
Information Center (RIC), located at Crystal Gateway I, First Floor, 
1235 Jefferson Davis Highway, Arlington, VA. The RIC is open from 9 
a.m. to 4 p.m., Monday through Friday, excluding federal holidays. To 
review docket materials, we recommend that you make an appointment by 
calling (703) 603-9230. You may copy a maximum of 100 pages from any 
regulatory docket at no charge. Additional copies cost $0.15/page. For 
information on accessing paper and/or electronic copies of the 
document, see the Supplementary Information section.

How Can I Influence EPA's Thinking on This Proposed Rule?

    In developing this proposal, we tried to address the concerns of 
all our stakeholders. Your comments will help us improve this rule. We 
invite you to provide different views on options we propose, new 
approaches we haven't considered, new data, how this proposed rule may 
effect you, or other relevant information. We welcome your views on all 
aspects of this proposed rule, but request comments on specific issues 
throughout this notice. We grouped these specific requests near the end 
of the sections in which we discuss the relevant issues. Your comments 
will be most effective if you follow the suggestions below:

[[Page 40193]]

     Explain your views and reasoning as clearly as possible.
     Provide solid technical and cost data to support your 
views.
     If you estimate potential costs, explain how you arrived 
at the estimate.
     Tell us which parts you support, as well as those with 
which you disagree.
     Provide specific examples to illustrate your concerns.
     Offer specific alternatives.
     Refer your comments to specific sections of the proposal, 
such as the units or page numbers of the preamble, or the regulatory 
sections.
     Be sure to include the name, date, and docket number with 
your comments.

Contents of This Proposed Rule

    The following outline lists the contents of the preamble to this 
proposed rule:

I. Overview
    A. Who Would Potentially be Affected by This Proposed Rule?
    B. Why Does This Proposed Rule Read Differently From Other 
Listing Rules?
    C. What Are the Statutory Authorities for This Proposed Rule?
II. Background
    A. How Does EPA Define a Hazardous Wastes?
    B. What Industries Are Covered in This Proposed Rule?
    C. Confidential Business Information (CBI) Issues Regarding This 
Rule
    D. What Wastes Are Covered in Today's Proposed Rule?
    E. What Information Did EPA Collect and Use?
III. Approach Used in This Proposed Listing
    A. Summary of Today's Action
    B. What Is a Concentration-Based Listing?
    C. Why Is a Concentration-Based Approach Being Used for This 
Listing?
    D. What Risk Assessment Approach Did EPA Use?
    E. How Did EPA Estimate Exposure Concentrations?
    F. What Exposure Assumptions and Toxicity Levels Did EPA Use?
    G. What Uncertainties Are Associated With the Risk Assessment?
    H. What Risk Level Do the Concentration Levels Represent?
    I. What Are the Proposed Listing Levels?
IV. Proposed Listing Determinations and Regulations
    A. What Are the Proposed Regulations for the Two Wastes?
    B. What Are We Proposing for Anthraquinone Sludges?
    C. What Is the Status of Landfill Leachate From Previously 
Disposed Wastes?
V. Generator Requirements for Implementation of Concentration-Based 
Listings
    A. Do I Have to Determine Whether or Not My Waste Is Hazardous?
    B. How Do I Manage My Waste During the Period Between the 
Effective Date of the Final Rule and Initial Hazardous Waste 
Determination for My Waste?
    C. What Are the Steps I Must Follow to Determine Whether or Not 
My Waste Is Hazardous?
    D. What Are the Requirements for a Waste Determined to be 
Nonhazardous, and How Do I Claim My Waste to Be Nonhazardous?
    E. What Records Am I Required to Keep On-site to Support a 
Nonhazardous Claim for My Waste?
    F. What Happens if I Do Not Meet the Notification and 
Recordkeeping Requirements for a Waste That I Have Determined to be 
Nonhazardous?
    G. What Are the Follow-up Waste Analysis Requirements for My 
Nonhazardous Waste?
    H. What Happens If My Waste Constituent Concentrations Are No 
Longer Below the Listing Concentrations?
    I. Can I Treat My Waste to Below Listing Concentrations and Then 
Claim My Waste to Be Nonhazardous?
    J. Alternative Implementation Approach
VI. Proposed Treatment Standards Under RCRA's Land Disposal 
Restrictions
    A. What are EPA's Land Disposal Restrictions (LDRs)?
    B. How Does EPA Develop LDR Treatment Standards?
    C. What Treatment Standards Are Proposed?
    D. Other LDR-Related Provisions
    E. Is There Treatment and Management Capacity Available for 
These Proposed Newly Identified Wastes
VII. State Authority and Compliance
    A. How Are States Authorized Under RCRA?
    B. What Is the Effect of Today's Proposal on State 
Authorizations?
    C. Who Must Notify EPA That They Have a Hazardous Waste?
    D. What Do Generators and Transporters Have to Do?
    E. Which Facilities Are Subject to Permitting?
VIII. CERCLA Designation and Reportable Quantities
    A. What Is the Relationship Between RCRA and CERCLA?
    B. Is EPA Proposing to Add Dye and Pigment Production Wastes to 
CERCLA?
    C. Is EPA Proposing to Adjust the Statutory One Pound RQ for 
K167 and K168 Wastes?
    D. When Do I Need to Report a Release of K167 and K168 Wastes 
Under CERCLA?
    E. How Do I Report a Release?
    F. What Is the Statutory Authority for This Program?
IX. Analytical and Regulatory Requirements
    A. Is This a Significant Regulatory Action? (Executive Order 
12866)
    B. Why Is This Proposed Rule Necessary?
    C. What Regulatory Options Were Considered?
    D. What Are the Potential Cost Impacts of Today's Proposed Rule?
    E. What Are the Potential Economic Impacts to Industry From the 
Proposed Rule?
    F. What Are the Potential Benefits From the Proposed Rule?
    G. What Consideration Was Given to Small Entities?
    H. What Consideration Was Given to Children's Health?
    I. What Consideration Was Given to Environmental Justice?
    J. What Consideration Was Given to Unfunded Mandates?
    K. What Consideration Was Given to Tribal Governments Analysis?
    L. Was the National Technology Transfer and Advancement Act 
Considered?
    M. How is the Paperwork Reduction Act Considered in Today's 
Proposal?

I. Overview

A. Who Would Potentially Be Affected by This Proposed Rule?

    The action, if finalized, could potentially affect those who handle 
the waste streams proposed for listing on EPA's RCRA list of hazardous 
wastes. This action may also affect entities that may need to respond 
to releases of these wastes as CERCLA hazardous substances. Those 
affected may include:

------------------------------------------------------------------------
           Category                        Affected entities
------------------------------------------------------------------------
Industry.....................  Generators of the following listed
                                wastes, or entities that treat, store,
                                transport, or dispose of these wastes or
                                materials derived from them.
                               K167  Spent filter aids, diatomaceous
                                earth, or adsorbents used in the
                                production of azo, anthraquinone, or
                                triarylmethane dyes, pigments, or FD&C
                                colorants.
                               K168  Wastewater treatment sludges from
                                the production of triarylmethane dyes
                                and pigments (excluding triarylmethane
                                pigments using aniline as a feedstock).
State, Local, Tribal Govt....  State and Local Emergency Planning
                                entities.
Federal Govt.................  National Response Center, and any Federal
                                Agency that handle the listed waste or
                                chemical.
------------------------------------------------------------------------

    We do not intend this table to be exhaustive, but rather our aim is 
to provide a guide for readers regarding entities likely to be 
regulated by this action. This table lists those entities that EPA now 
is aware potentially could be

[[Page 40194]]

affected by this action. However, this action may affect other entities 
not listed in the table. To determine whether your facility is 
regulated by this action, you should examine 40 CFR parts 260 and 261 
carefully in concert with the amended rules found at the end of this 
Federal Register document. Furthermore, we are proposing this rule as a 
concentration-based listing, such that waste generators have the option 
of determining that their specific waste is nonhazardous (see Sections 
IV and V of today's rule). If you have questions regarding the 
applicability of this action to a particular entity, consult the person 
listed in the preceding section entitled FOR FURTHER INFORMATION 
CONTACT.

B. Why Does This Proposed Rule Read Differently From Other Listing 
Rules?

    Today's proposed listing determination preamble and regulations are 
written in ``readable regulations'' format. The authors tried to use 
active rather than passive voice, plain language, a question-and-answer 
format, the pronouns ``we'' for EPA and ``you'' for the owner/
generator, and other techniques to make the information in today's 
proposed rule easier to read and understand. This new format is part of 
the Agency's efforts at regulatory reinvention, and it makes today's 
proposed rule read differently from other listing rules. The Agency 
believes that this new format will increase readers' abilities to 
understand the regulations, which should then increase compliance, make 
enforcement easier, and foster better relationships between EPA and the 
regulated community.
    All of the requirements found in today's proposed regulations would 
constitute binding, enforceable legal requirements. The plain language 
format used in today's proposed regulations may appear different from 
other rules, but it would establish binding, enforceable legal 
requirements just as those in the existing regulations.

C. What Are the Statutory Authorities for This Proposed rule?

    EPA is proposing these regulations under the authority of Sections 
2002(a), 3001 (a), (b) and (e)(2), 3004 (g) and (m), and 3007(a) of the 
Solid Waste Disposal Act (commonly referred to as RCRA), as amended by 
the Hazardous and Solid Waste Amendments of 1984 (HSWA). These statutes 
are codified in Volume 42 of the United States Code (U.S.C.), sections 
6901 to 6992(k).
    Section 102(a) of the Comprehensive Environmental Response, 
Compensation, and Liability Act of 1980 (CERCLA), 42 U.S.C. 9602(a), is 
the authority for the CERCLA aspects of this proposed rule.

II. Background

A. How Does EPA Define a Hazardous Waste?

    EPA's regulations establish two ways of identifying wastes as 
hazardous under RCRA. Wastes may be hazardous either if they exhibit 
certain properties (``characteristics''), or if the wastes are included 
on a specific list of wastes EPA has determined are hazardous 
(``listing'' a waste as hazardous). EPA's regulations in the Code of 
Federal Regulations (40 CFR) Secs. 261.20 through 261.24 define 
characteristic wastes. These regulations classify wastes that exhibit 
certain properties as having the characteristic of ignitability, 
corrosivity, reactivity, or toxicity. As a generator, you must identify 
wastes as characteristic wastes by sampling a waste, or by using 
appropriate company records concerning the nature of the waste, to 
determine whether a waste has the relevant properties (see 
Sec. 262.11(c)). There is no regulatory requirement to conduct 
sampling, but persons improperly managing materials that are found to 
be characteristic hazardous wastes are subject to enforcement actions 
under RCRA.
    EPA may ``list'' wastes as hazardous if we conclude that the waste 
is capable of posing a substantial present or potential hazard to human 
health or the environment when improperly managed. We have established 
criteria for listing a hazardous waste at 40 CFR 261.11(a)(3) for 
wastes that contain hazardous constituents identified in Appendix VIII 
of 40 CFR part 261. In deciding whether a wastes poses a substantial 
hazard, we consider the factors given in Sec. 261.11(a)(3). We place 
constituents in Appendix VIII if scientific studies have shown a 
chemical has toxic effects on life forms (see 261.11(a)(3)). When 
listing a waste, we also add the hazardous constituents that serve as 
the basis for listing to Appendix VII to part 261.
    The regulations at 40 CFR 261.31 through 261.33 contain the various 
hazardous wastes the Agency has listed to date. Section 261.31 lists 
wastes generated from non-specific sources, known as ``F-wastes,'' and 
contains wastes that are usually generated by various industries or 
types of facilities, such as ``wastewater treatment sludges from 
electroplating operations'' (see code F006). Section 261.32 lists 
hazardous wastes generated from specific industry sources, known as 
``K-wastes,'' such as ``Spent potliners from primary aluminum 
production'' (see code K088). Section 261.33 contains lists of 
commercial chemical products and other materials that become hazardous 
wastes, known as ``P-wastes'' or ``U-wastes,'' when they are discarded 
or intended to be discarded.
    The proposed regulations in today's notice would list wastes from a 
specific industry and thus these wastes would be added to Sec. 261.32 
with K-waste codes. We are proposing to add constituents that serve as 
the basis for the proposed listings to Appendix VII, Part 261. For the 
chemicals not already listed on the list of Hazardous Constituents in 
Appendix VIII, we are also proposing to add these chemicals to that 
list.
    Wastes listed as hazardous are subject to federal requirements 
under RCRA. These regulations affect persons who generate, transport, 
treat, store or dispose of such waste. Facilities that must meet the 
hazardous waste management requirements, including the need to obtain 
permits to operate, commonly are referred to as Subtitle C facilities. 
Subtitle C is Congress' original statutory designation for that part of 
RCRA that directs EPA to issue those regulations for hazardous wastes 
as may be necessary to protect human health or the environment. EPA 
standards and procedural regulations implementing Subtitle C are found 
generally at 40 CFR Parts 260 through 272.
    Solid wastes that are not hazardous wastes may be disposed of at 
facilities that are overseen by state and local governments. These are 
the so-called Subtitle D facilities, which generally impose less 
stringent requirements on management of wastes. Subtitle D is Congress' 
original statutory designation for that part of RCRA that deals with 
disposal of solid waste. EPA regulations affecting Subtitle D 
facilities are found generally at 40 CFR Parts 240 thru 247, and 255 
thru 258. Regulations for Subtitle D landfills that accept municipal 
waste (``municipal solid waste landfills'') are given in Part 258.
    Residuals from the treatment, storage, or disposal of most listed 
hazardous wastes are also classified as hazardous wastes based on the 
``derived-from'' rule (40 CFR 261.3(c)(2)(i)). For example, ash or 
other residuals from treatment of the listed wastes generally carry the 
original waste code and are subject to the hazardous waste regulations. 
Also, the ``mixture'' rule (40 CFR 261.3(a)(2)(iv)) provides that, with 
certain limited exceptions, any mixture of a listed hazardous waste and 
a solid waste is itself a RCRA hazardous waste. However, when these 
wastes are recycled as described in 40 CFR 261.2(e)(1)(iii) or 
261.4(a)(8), they are

[[Page 40195]]

not solid wastes and are not subject to hazardous waste regulations. 
For example, if a waste is collected and returned in a closed-loop 
fashion to the same process, the waste is not regulated.
    All RCRA hazardous wastes are also hazardous substances under the 
Comprehensive Environmental Response, Compensation, and Liability Act 
(CERCLA), as described in section 101(14)(C) of the CERCLA statute. 
This applies to wastes listed in 261.31 through 261.33, as well as any 
wastes that exhibit a RCRA characteristic. Table 302.4 at 40 CFR 302.4 
lists CERCLA hazardous substances along with their reportable 
quantities (RQs). Anyone spilling or releasing a substance at or above 
the RQ must report this to the National Response Center, as required in 
CERCLA Section 103. In addition, Section 304 of the Emergency Planning 
and Community Right-to-Know Act (EPCRA) requires facilities to report 
the release of a CERCLA hazardous substance at or above its RQ to State 
and local authorities. Today's rule proposes to establish RQs for the 
newly listed wastes. EPA is not taking action at this time to adjust 
the one-pound statutory RQs for the newly listed hazardous substances.

B. What Industries Are Covered in This Proposed Rule?

1. The Dye and Pigment Industries
    Today's proposal applies to the manufacturers of organic dyes and 
pigments, and does not affect producers of only inorganic dyes or 
pigments. We have already issued final rules governing the 
manufacturing of inorganic pigments. Section 261.32 contains wastes 
codes K002 through K008 that list wastewater treatment sludges and 
other residues from the production of inorganic pigments.
    The organic dye and pigment industries are comprised of three 
related industries, dye manufacturers, pigment manufacturers, and Food, 
Drug, and Cosmetic (FD&C) colorant manufacturers. Dyes are colored or 
fluorescent organic substances which impart color to a substrate. When 
a dye is applied, it penetrates the substrate in a soluble form, after 
which it may or may not become insoluble. Dyes are used to color 
fabrics, leather, paper, ink, lacquers, varnishes, plastics, cosmetics, 
and some food items. Dye manufacture in the U.S. includes more than 
2,000 individual dyes, the majority of which are produced in quantities 
of less than 50,000 pounds. The U.S. International Trade Commission's 
(USITC) production data for 1994 showed total production of 
approximately 156,000 tons for all organic dyes.
    Organic pigments possess unique characteristics that distinguish 
them from dyes and other colorants. The primary difference between 
pigments and dyes is that, during the application process, pigments are 
usually insoluble in the substrate. Pigments also retain a crystalline 
or particulate structure and impart color by selective absorption or by 
scattering of light. This is different from dyes, which impart color by 
selective absorption. Pigments are used in a variety of applications; 
the primary use is in printing inks. There are fewer pigments produced 
than dyes, though pigment batches are generally larger in size. The 
USITC publication, Industry and Trade Summary: Synthetic Organic 
Pigments, USITC (No. 3021, February 1997), indicates that the total 
U.S. production was an estimated 71,500 tons of organic pigments in 
1995.
    FD&C colorants are dyes and pigments that have been approved by the 
Food and Drug Administration (FDA) for use in food items, drugs, and/or 
cosmetics. Typically, FD&C colorants are azo or triarylmethane dyes and 
are similar or identical to larger-volume dye products not used in 
food, drugs, and cosmetics. Manufacture of FD&C colorants is typically 
the same as that for the corresponding dye or pigment, except that the 
colorant undergoes additional purification. Each FD&C colorant batch is 
tested and certified by the FDA.
2. Previous Regulations of Wastes From This Industry
    The 1984 Hazardous and Solid Waste Amendments (HSWA) to RCRA 
require EPA to make listing determinations for wastes from the 
production of dyes and pigments (see RCRA section 3001(e)(2)). On June 
1991 EPA entered into a proposed consent decree in a lawsuit filed by 
the Environmental Defense Fund (EDF v. Browner, Civ. No. 89-0598 
(D.D.C.), hereafter referred to as the consent decree). The consent 
decree sets out a series of deadlines for promulgating RCRA listing 
decisions, and has been amended as necessary. Paragraph 1h. of the 
consent decree obligates EPA to determine whether or not to list as 
hazardous certain wastes from the production of dyes and pigments.
    In the consent decree EPA agreed to examine wastes from the 
manufacture of three classes of dyes and pigments for regulation: azo/
benzidine, anthraquinone, and triarylmethane. The agreement specifies 
that the listing determination is to address wastes from the azo, 
monoazo, diazo, triazo, polyazo, azoic, and benzidine categories of the 
azo/benzidine dye and pigment class; the anthraquinone and perylene 
categories of the anthraquinone dye and pigment class; and the 
triarylmethane, triphenylmethane, and pyrazolone categories of the 
triarylmethane dye and pigment class. The settlement agreement also 
specifies that the listing determination is to address the following 
specific types of wastes where they are found: spent catalysts, reactor 
still overheads, vacuum system condensate, process waters, spent 
adsorbent, equipment cleaning sludge, product mother liquor, product 
standardization filter cake, dust collector filter fines, recovery 
still bottoms, treated wastewater effluent, and wastewater treatment 
sludge.
    Due to the market demand for a wide variety of dye and pigment 
products, the dye and pigment industries typically operate successive 
batch processes producing varying dye and pigment products. These batch 
operations generate a wide variety of solid wastes on a periodic basis. 
These wastes generally can be divided into two general types: 
commingled wastes and process-specific wastes. Commingled wastes are 
wastes combined from multiple processes prior to management (e.g., 
wastewaters). Commingled wastes include secondary wastes generated from 
the treatment of other commingled wastes (e.g., wastewater treatment 
sludges). Process-specific wastes are wastes that are unique to a 
specific process and may be managed independently of one another (e.g., 
spent filter aids).
    On December 22, 1994, EPA published a notice that proposed listing 
decisions for 11 of the wastes covered in the consent decree. EPA 
deferred any listing decisions on three other wastes. (See 59 FR 
66072). As a result, EPA and EDF amended the consent decree (paragraph 
1h(v)) to establish deadlines for promulgating listing decisions for 
two of the deferred wastes. In today's notice, EPA is proposing listing 
determinations for all three of the deferred wastes.

C. Confidential Business Information (CBI) Issues Regarding This Rule

    For the purpose of developing the supporting data for listing 
rulemakings for the dye and pigment industry, a questionnaire was sent 
out to industry pursuant to RCRA Section 3007. Some of the information 
collected from industry and used in the 1994 proposed rule, as well as 
today's proposed rule, was claimed as confidential. As a result of a 
consent order and a subsequent preliminary injunction in connection

[[Page 40196]]

with a case brought by some of the dye and pigment industry to prevent 
the disclosure of information claimed as CBI, Magruder et al. v. U.S. 
EPA, Civ. No. 94-5768 (D.N.J.), the EPA is enjoined from disclosing 
information claimed as confidential until all CBI determinations have 
been made on the data intended to be published in connection with these 
proposed rules.
    Therefore, as with the 1994 proposed rule, we have removed 
information from this preamble and rule (and supporting background 
documents), if the information may disclose information claimed as CBI. 
We note the missing information in the text to this rule, where 
appropriate. However, we have included data that are not claimed as 
CBI, whenever such data are available. We have also included data that 
we obtained from public or non-CBI sources. Wherever we are unable to 
include pertinent data in a table, the following statement appears in a 
footnote: ``Relevant data are not included at the present time due to 
business confidentiality concerns.''
    At this time EPA expects that this rule will also need some form of 
notice of data availability (NODA) or reproposal prior to promulgation 
as a final rule because of CBI problems. However, EPA is proceeding as 
noted above to allow publication of as much of the proposed rule as can 
be shared at this time. Thus, commenters can see as much as possible of 
EPA's current thinking and can comment on the basic approach, the 
implementation issues, and other portions of the rule that can 
reasonably be commented upon, even with the current redactions. We 
intend to supplement the public record prior to issuing a final listing 
determination.

D. What Wastes Are Covered in Today's Proposed Rule?

    Today's proposal applies only to the dye and pigment manufacturing 
industries. The end-user markets for dyes and pigments, which include 
textiles, paper, leather, ink, paints, coatings, plastics, fibers, and 
other low volume markets, are not within the scope of our listing 
determination. Consistent with both HSWA Amendments of 1984 and the 
consent decree, EPA is only making proposed determinations on wastes 
from the production and manufacturing of dyes and pigments.
    In the 1994 proposed rule, the Agency deferred action on three 
waste streams based on insufficient characterization data, or lack of 
health-based levels for specific constituents of concern. The 
``deferred'' dye and pigment waste streams are the subject of today's 
proposed rule. The three deferred wastes are:
     Spent filter aids, diatomaceous earth, or adsorbents used 
in the production of azo, anthraquinone, or triarylmethane dyes, 
pigments, or FD&C colorants.
     Wastewater treatment sludge from the production of 
triarylmethane dyes and pigments (excluding triarylmethane pigments 
using aniline as a feedstock).
     Wastewater treatment sludge from the production of 
anthraquinone dyes and pigments.
    This proposed rule will refer to these wastes as ``filter aids,'' 
``TAM sludges,'' and ``anthraquinone sludges'' respectively. Brief 
descriptions of the three wastes are given below.
Filter Aids
    Manufacturers add filter aids (e.g., diatomaceous earth) to some 
reaction processes to remove particulate impurities. The spent filter 
aids then are collected in a filter press and the press cake, sometimes 
called a clarification sludge, is disposed as waste. In some cases, 
facilities also use filter aids following completed reactions to 
clarify and purify certain products. The Agency grouped spent filter 
aids, diatomaceous earth, and adsorbents used in the production of all 
relevant classes of dyes and pigments, because these wastes typically 
contain unreacted raw materials, by-products, and impurities. The 
constituent composition of these filter aids varies depending on the 
dye or pigment produced and the raw materials used. The Agency deferred 
a determination as to whether to list Filter Aids in 1994 due to 
insufficient waste characterization data for this widely variable waste 
(see 59 FR 66103).
TAM Sludges
    As described in the 1994 proposed rule, EPA evaluated wastes from 
the production of TAM pigments that use aniline as starting material 
(``feedstock'') separately from other TAM wastewaters and wastewater 
treatment sludges. This was because the process that uses aniline as a 
feedstock is somewhat different (see 59 FR 66081 and 66096). We 
proposed listing decisions for wastes from TAM pigments derived from 
aniline in the 1994 notice, but deferred a decision for wastewater 
treatment sludge from the production of TAM dyes and pigments that do 
not use aniline. Today's proposed rule addresses the wastewater 
treatment sludges from production of TAM dyes and pigments, excluding 
TAM pigments using aniline as a feedstock.
    The typical wastewater treatment sludge is generated via the 
treatment of the following process waste streams: equipment washdown, 
plant run-off, spent scrubber liquid and mother liquor. Wastewater 
treatment steps usually include: neutralization to adjust pH, 
clarification, and biological treatment. Pretreatment sludges may be 
generated from precipitation/filtration in neutralization tanks, and 
from treatment with adsorbents, such as activated carbon. Biological 
treatment can also lead to generation of a wastewater treatment sludge. 
Sludge streams are further processed, typically through filtration and 
dewatering, prior to disposal. Information related to the management of 
TAM sludges is not included due to business confidentiality concerns.
    In support of the 1994 proposed rule, we attempted to sample TAM 
sludges (from production of TAM pigments that do not use aniline as a 
feedstock). However, TAM dyes or pigments were not being produced at 
the time EPA collected its samples, and we could not attribute any 
constituents detected to TAM production. Thus, EPA deferred any listing 
decision for sludges from the production of TAM dyes and pigments 
(excluding TAM pigments using aniline as a feedstock) due to 
insufficient waste characterization data (see 59 FR 66095).
Anthraquinone Sludges
    The typical anthraquinone sludge is generated via the treatment of 
process wastewater similar to that described for TAM sludges. From the 
data collected for the 1994 proposed rule, the only constituents 
detected in the waste that we could attribute to anthraquinone 
production did not have health-based benchmarks. EPA was unable to 
identify any appropriate surrogate compound of known toxicity to 
estimate the toxicity of these constituents. Because of the lack of 
health-based benchmarks or reliable surrogates, we deferred any listing 
determination in the 1994 proposal. As part of the deferral, we 
requested toxicity data or any suitable surrogates for the two waste 
constituents (see 59 FR 66101).

E. What Information Did EPA Collect and Use?

1. The RCRA Section 3007 Survey
    In support of the 1994 proposed rule, EPA distributed a detailed 
RCRA section 3007 survey to dye and pigment manufacturing facilities in 
1992. The purpose of the questionnaire was to collect information on 
the 12 specific residuals identified in the 1991 consent decree. Most 
questions in this survey requested information on waste generation and 
management activities in

[[Page 40197]]

1991. From data provided by questionnaire respondents, EPA identified 
facilities that manufacture azo, anthraquinone, or triarylmethane dyes 
or pigments (the number of facilities is not included due to business 
confidentiality concerns). In the questionnaire, EPA collected 
information regarding the products manufactured at each facility, raw 
materials and additives used, and 1991 production volumes. The 
questionnaire also collected information on the management of the 
wastes generated by each facility, including waste quantity and how the 
wastes were managed and disposed.
    EPA contacted companies generating the three deferred wastes at 
issue in today's proposed rule to update the information in the 1992 
Sec. 3007 survey. The updated information EPA collected includes the 
quantities of wastes generated (for the year 1997), and the waste 
management practices used by the facilities for each of the wastes. The 
Agency used this updated information in its risk assessment, as 
described in Section III.D. The following discussion summarizes the 
information collected for each waste.
Filter Aids
    In response to the 1992 questionnaire, a number of dye and pigment 
manufacturers reported generating filter aid wastes. We are not 
including information on the number of facilities generating this 
waste, nor the waste quantities reported for 1991, due to business 
confidentiality concerns. We also cannot include information collected 
by EPA in 1998 on the number of generators and the quantities for 1997 
for the same reason. Facilities that generated spent filter aids may 
generate this waste from the production of a wide variety of different 
dyes and pigments. For example, one facility reported generating a 
total of 90 Mtons of filter aid wastes in 1997, comprised of 18 filter 
aids arising from the production of dyes and/or pigments.
TAM Sludges
    In response to the 1992 questionnaire, a number of dye and pigment 
manufacturers reported generating TAM wastewater treatment sludges. We 
are not including information on the number of facilities generating 
this waste, nor the waste quantities reported for 1991, due to business 
confidentiality concerns. We also cannot include information collected 
by EPA in 1998 on the number of generators and the quantities for 1997 
for the same reason. As noted previously, EPA was unable to collect 
samples of this waste.
Anthraquinone Sludges
    In response to the 1992 questionnaire, a number of dye and pigment 
manufacturers reported generating anthraquinone wastewater treatment 
sludges. We are not including information on the number of facilities 
generating this waste, nor the waste quantities reported for 1991, due 
to business confidentiality concerns. We also cannot include 
information collected by EPA in 1998 on the number of generators and 
the quantities for 1997 for the same reason.
    As noted above, the only chemicals detected in sludge that could be 
attributed to anthraquinone production in 1994 did not have health-
based benchmarks. EPA did not receive any information in comments on 
the 1994 proposal that would assist us in calculating health 
benchmarks. Furthermore, EPA has not subsequently found any suitable 
surrogates to estimate the toxicity of the compounds in question.
2. Sampling and Analysis Data
    For the 1994 proposed rule, the Agency performed sampling to 
characterize the wastes generated at dye and pigment manufacturing 
facilities. EPA collected a total of 34 waste samples from facilities 
to characterize the residuals under evaluation. The analytical results 
for all the wastes are summarized in the Background Document for 
Identification and Listing of the Deferred Dye and Pigment Wastes, 
Appendix A (hereafter called the Listing Background Document) for 
today's proposal, which is available in the docket. (Note however, that 
we cannot release much of the analytical data due to business 
confidentiality concerns). The dye and pigment manufacturers also 
provided a limited amount of additional waste sampling and analysis 
data in 1994. These additional data include aggregated analytical 
results from 19 industry analyses of samples that EPA and the 
facilities split during sampling visits. An industry trade group (Color 
Pigment Manufacturers' Association, or CPMA) aggregated this analytical 
information and submitted this information to EPA in April 1994. CPMA 
also included this information in the group's public comments on the 
1994 proposed rule (see Docket No. F-94-DPLP-FFFFF, item DPLP-0025). We 
used the available sampling data from these sources to identify 
potential constituents of concern for use in today's proposed rule.
    For the 1994 proposed rule, EPA collected limited sampling data for 
spent filter aids. Our sampling results were inconclusive for TAM 
sludges because these products were not manufactured during our 
sampling visit. While we did succeed in obtaining samples of 
anthraquinone sludge, we do not have health benchmarks for the two 
constituents that could be attributed to production of anthraquinone 
products.

III. Approach Used in This Proposed Listing

A. Summary of Today's Action

    In listings promulgated by EPA, we typically describe the scope of 
the listing in terms of the waste material and the industry or process 
generating the waste. However, in today's rule we are proposing to use 
a new approach in these listings, a ``concentration-based listing.'' In 
a concentration-based listing, a waste would be hazardous unless a 
determination is made that it does not contain any of the constituents 
of concern at or above specified levels of concern. This approach draws 
from the concept of the characteristic approach to defining a hazardous 
waste, in that whether a waste is hazardous depends on the levels of 
key constituents in the wastes. We describe this concept in detail 
later in this notice.
    We are proposing concentration-based listings for two of the 
deferred wastes:
     Spent filter aids, diatomaceous earth, or adsorbents used 
in the production of azo, anthraquinone, or triarylmethane dyes, 
pigments, or FD&C colorants.
     Wastewater treatment sludge from the production of 
triarylmethane dyes and pigments (excluding triarylmethane pigments 
using aniline as a feedstock).
    For both wastes, the listings would apply if the wastes contain any 
of the constituents identified in the regulation at a concentration 
equal to or greater than the hazardous level set for that constituent 
(see tables IV-1 and IV-2 for levels). We are also proposing a set of 
conditions and requirements that must be met if a facility wishes to 
claim its waste does not exceed these levels and is, therefore, not 
covered by the listing.
    We are proposing not to list as hazardous the third waste 
considered:
     Wastewater treatment sludge from the production of 
anthraquinone dyes and pigments.
    In the following sections we describe the concept of a 
concentration-based listing and the risk assessment methodology we used 
to develop concentration limits for each wastes. We describe our 
proposed decisions in more detail in Section IV.

[[Page 40198]]

B. What Is a Concentration-Based Listing?

    A concentration-based listing specifies constituent-specific levels 
in a waste that causes the waste to become a listed hazardous waste. In 
this proposed rule, we identify constituents of concern likely to be 
present in two categories of dye and pigment wastes. Using risk 
assessment tools developed to support our hazardous waste 
identification program, we assessed the potential risks associated with 
the constituents of concern. From this analysis, we developed ``listing 
concentrations'' for each of the constituents of concern in the two 
waste categories.
    If you generate any of the wastes included in the two categories of 
dye and pigment wastes referenced above, you must either determine 
whether or not your waste is hazardous or assume that it is hazardous 
as-generated. We are proposing that you determine representative 
concentrations for the constituents of concern in your waste through 
sampling and analyses, unless you can use process knowledge to 
demonstrate that certain constituents are not present in your waste. 
Based on this information, you must make a determination as to whether 
or not your waste is a listed hazardous waste. Your waste would be a 
listed hazardous waste if it contains any of the constituents of 
concern at a concentration equal to or greater than the hazardous 
concentration identified for that constituent. If all of the 
constituents of concern in your waste were below their respective 
listing concentrations, you would need to notify EPA that your wastes 
are nonhazardous. The detailed descriptions of the steps you would be 
required to follow to implement the concentration-based listing are 
described later in this proposed rule.

C. Why Is a Concentration-Based Approach Being Used for This Listing?

    There are several reasons for using a concentration-based approach 
for listing the deferred dyes and pigments wastes. First, these wastes 
are generated by an industry that uses batch processes to manufacture a 
variety of products, in response to market demand for a wide variety of 
dye and pigment products. Batch operations may result in highly 
variable wastes at the same facility or different facilities. A 
concentration-based approach allows the variable wastes generated at 
these facilities to be evaluated individually for hazard, so only the 
truly hazardous wastes are listed. This tailored approach is more cost-
effective for the industry than a standard listing, and avoids the 
unnecessary regulation of nonhazardous waste.
    Alternatively, EPA could have attempted to collect more information 
on these specific wastes to support a straightforward listing, i.e., 
without any concentration limits. However, such a data collection 
effort would have been difficult due to the wide variety of individual 
dye or pigment products produced and the potential variability in the 
waste characteristics. For example, one facility generated 18 filter 
aid wastes in 1997 arising from the production of different dyes and/or 
pigments. Gathering sufficient samples to evaluate all potential filter 
aid wastes would require a large commitment of scarce Agency resources 
that would have been beyond the reasonable scope of this rulemaking, 
especially given the time constraints of the existing Consent Decree. 
Given the relatively low quantities of the individual filter aids 
produced, EPA does not feel such an effort was justified.
    Second, many manufacturers in the dye and pigment industries want 
to keep facility-specific product and waste information confidential. 
These manufacturers are concerned that release of such information 
could cause competitive harm. A concentration-based listing allows us 
to rely less on CBI, since we do not use this information directly to 
set the listing concentrations. This means we don't use specific 
information, such as product formulations or concentrations of 
constituents in the wastes, to set hazardous concentration levels for 
constituents of concern. As noted earlier, however, in this particular 
listing EPA still must resolve the CBI claims on some specific data 
prior to release.
    Finally, a concentration-based listing approach may provide an 
incentive for hazardous waste generating facilities to modify their 
manufacturing processes or treat their wastes. For example, if a 
facility has a listed hazardous waste based on constituent-specific 
concentration levels established by EPA, it also knows the required 
concentrations levels of constituents in its waste below which its 
waste would become nonhazardous. Therefore, the facility may decide to 
modify its manufacturing process in order to generate a nonhazardous 
waste. Thus, this approach encourages waste minimization.
    Section 1003 of the HSWA indicates that one of RCRA's goals is to 
promote protection of human health and the environment and to conserve 
valuable material and energy resources by ``minimizing the generation 
of hazardous waste and the land disposal of hazardous waste by 
encouraging process substitution, materials recovery, properly 
conducted recycling, and reuse and treatment.'' Section 1003 further 
provides that it is a national policy of the United States that, 
whenever feasible, the generation of hazardous waste is to be reduced 
or eliminated as expeditiously as possible.
    The Pollution Prevention Act of 1990 (42 U.S.C. 13101 et seq., Pub. 
L. 101-508, November 5, 1990) provides a hierarchy of pollution 
prevention approaches. Pollution should be prevented or reduced; 
pollution that cannot be prevented should be recycled or reused in an 
environmentally safe manner; pollution that cannot be prevented/reduced 
or recycled should be treated; and disposal or release into the 
environment should be chosen only as a last resort. A concentration-
based listing may prevent pollution by discouraging generation of 
wastes with high levels of toxic constituents. If EPA provides a 
concentration-based target in the listing, generators would have the 
regulatory and economic incentive to meet the reduced levels.

D. What Risk Assessment Approach Did EPA Use?

    Under a concentration-based listing approach, EPA must calculate 
concentration levels, or ``listing levels,'' in the waste that would 
present a hazard. To accomplish this, the Agency: (1) Selected 
constituents of potential concern in the waste, (2) chose a plausible 
waste management scenario, (3) calculated exposure concentrations by 
modeling the release and transport of the constituents from the waste 
management unit to the point of exposure, and (4) calculated waste 
concentrations that would yield the target risk level at the point of 
exposure.
    The following sections present an overview of the analysis EPA used 
to calculate risk-based listing levels for filter aids and TAM sludges 
generated during the manufacture of organic dye and pigment products. 
You will find more details of how we selected the constituents of 
concern in the Listing Background Document. Details of the risk 
assessment are provided in the document in the docket entitled 
Development of Risk-Based Listing Concentrations for Hazardous 
Constituents Contained in Spent Filter Aids and Triarylmethane (TAM) 
Wastewater Treatment Sludges (hereafter called the Risk Assessment 
Background Document).

[[Page 40199]]

1. Choosing the Constituents of Concern
    Our initial universe of constituents of potential concern included 
any constituent detected in any wastestream from the production of all 
classes of dyes and pigments we examined (i.e., all wastes sampled 
associated with the production of azo, TAM, and anthraquinone dyes or 
pigments, including FD& C colorants). We typically obtain samples from 
the specific wastes of concern for a standard listing evaluation. 
However, obtaining representative samples of filter aids and TAM 
sludges was difficult, as noted in the 1994 proposal (see 59 FR 66095 
and 66103), due to widely varying wastes and batch processes. We 
believe that the broad universe of constituents detected in all wastes 
examined provides an appropriate starting point for selecting 
constituents of concern for filter aids, because these wastes may be 
generated from the production of many kinds of dyes and pigments. 
Because TAM sludge is a much more narrowly defined waste, we relied on 
available information regarding constituents used in TAM production to 
determine what constituents we expect in the waste.
    Our primary source of potential constituents was the set of 
analytical data EPA collected to support the 1994 proposed rule 
described in Section I.E.2 of today's notice. We also examined the 
limited analytical data from industry to confirm the presence of 
constituents. These data sets included sampling results for all wastes 
under consideration in the 1994 proposal, because the available 
analytical data for the three specific wastes at issue are limited. For 
filter aids, EPA obtained some samples in support of the 1994 proposed 
rule. However, filter aids may potentially contain a variety of 
constituents, depending on what products and processes are in use by 
different facilities. Therefore, the limited waste analysis data for 
filter aids alone were not adequate to establish constituents of 
concern. We have no waste analysis data that would allow us to identify 
specific constituents of concern for TAM or anthraquinone sludges. As 
noted in Section II.D, our sampling results were inconclusive for TAM 
sludges because TAM dyes or pigments were not being produced at the 
time EPA collected its samples. While we did succeed in obtaining 
samples of anthraquinone sludge, we do not have health benchmarks for 
the two constituents that could be attributed to production of 
anthraquinone products. Thus, we did not pursue a listing for this 
waste.
    We used the analytical data from all wastes to develop an initial 
list of potential chemicals of concern. We then reduced and augmented 
this list based on several factors. First, we can only develop a 
concentration level if a health benchmark exists for the chemical. 
Therefore, we removed constituents without health benchmarks from 
further evaluation. The sources we used for health benchmark data are 
summarized below; the Risk Assessment Background Document contains 
further information (see Appendix E).
    Due to the lack of health-based benchmarks, we excluded certain 
constituents from consideration in today's proposed rule that we 
previously evaluated for azo dye and pigment wastes in the 1994 
proposed rule. These constituents are acetoacetanilide (AAA), 
acetoacet-o-toluidine (AAOT), and acetoacet-o-anisidine (AAOA). For the 
1994 proposal, we derived health based numbers based on a Structural 
Activity Relationship (SAR) analysis. The Agency has since reevaluated 
and revised the SAR analysis based on comments received in response to 
the 1994 proposal. The revised analysis, which has been independently 
peer reviewed, concludes that the current available data are 
insufficient to make a quantitative estimation of the carcinogenic 
potential of these compounds, or to establish provisional non-cancer 
benchmarks. The revised toxicological analysis for these compounds and 
the peer review documents are provided in Appendix A to the Risk 
Assessment Background Document.
    We then screened the remaining potential constituents to remove 
chemicals that we believed were of little use in defining the hazardous 
characteristic of the two wastes at issue. In this screen we considered 
the prevalence with which a constituent is used in the manufacturing of 
the different classes of dyes and pigments at issue in the consent 
decree, the likelihood that a chemical could be attributed to such 
production, and the frequency with which a chemical was detected in 
wastes samples. In considering if the constituents detected are likely 
to be derived from dye or pigment production, we used publicly 
available information from the Colour Index International (3rd edition, 
1996). For example, we retained any chemicals that were detected that 
are commonly used as raw materials in the production of the dyes and 
pigments at issue (e.g., aniline is widely used in the production of 
azo products; see Colour Index, vol. 4, pages 4009 and 4699). We also 
kept some chemicals detected that have no apparent use as raw 
materials, because they may be impurities or degradation products from 
chemicals used in the manufacturing process (e.g., naphthalene may be 
an impurity in a commonly used raw material, beta-naphthol). We removed 
some constituents, such as acetone and methylene chloride, that were 
detected frequently in samples, because they are common laboratory 
contaminants and/or common solvents that have no reported use in the 
production of these dyes and pigments. While such constituents may be 
present in wastes, we did not consider them further because we could 
not reasonably attribute them to dye and pigment production processes 
sampled. We dropped other constituents that had little or no reported 
use in the Colour Index; the dropped constituents were also rarely 
found in waste samples.
    We are proposing to include the selected core chemicals in Table 
III-1 as constituents of concern for defining the two listed wastes. 
This table summarizes the frequency with which we detected the 
chemicals in waste samples, and prevalence of use of the chemicals in 
the production of the three dye and pigment classes (azo, TAM, and 
anthraquinone) as found in the Colour Index. For filter aids we 
included constituents on the final list of constituents of concern if 
we detected the chemicals with at least a low frequency (i.e, in more 
than one sample), and we found some evidence that industry used the 
chemicals in the production of the dyes and pigments at issue. We also 
selected several chemicals that we believe may be degradation products 
of other raw materials (e.g., p-phenylenediamine), or possible 
impurities in other starting materials (e.g., naphthalene). Finally, we 
included several compounds that may arise from TAM production, as 
described below, even though we do not have analytical data showing 
these chemicals are present in wastes from this industry. (More details 
of our rationale for choosing chemicals of concern are given in the 
Listing Background Document, Section 4).
    We chose to add two chemicals for consideration as constituents of 
concern that were reported to be used in the production of TAM 
products, even though we did not find them in any waste samples. In the 
case of benzaldehyde, we did not analyze any of the wastes for this 
compound. However, this chemical is reported to be used in the 
production of TAM products (see Colour Index, vol.4, page 4727). We 
analyzed for the other chemical (the

[[Page 40200]]

identity is not given due to business confidentiality concerns), but we 
did not find it in any samples. However, the 3007 Survey indicated 
significant use of this chemical in the production of TAM dyes. EPA did 
not succeed in obtaining waste samples during the production of TAM dye 
and pigments (excluding TAM pigments using aniline as a feedstock). 
Therefore, based on the known uses in TAM manufacturing, we considered 
these two chemicals as potential constituents of concern.
    In the case of TAM sludges, we considered proposing the same list 
of core constituents used for filter aids. We considered this option 
primarily because we have no analytical data that reflects wastes 
arising from TAM production. (We do have data for wastes from the 
production of TAM pigments using aniline as a feedstock; this subset of 
TAM wastes were dealt with in the 1994 proposed rule and is not at 
issue in today's notice. We decided to propose a list based on the 
constituents that are known to be used in the manufacturing of TAM dyes 
or pigments. Using public sources of information (i.e., Colour Index), 
we were able to identify reactants reported in use for TAM products. 
Except as noted previously, the constituents identified in this way are 
consistent with the constituents reported in the 3007 Survey. This 
analysis led to the list of constituents of concern for TAM sludges.
    The publicly available information we used was consistent with the 
information provided by industry in responses to the 3007 Survey, 
except in a few cases. In some instances (the identities are not given 
due to business confidentiality concerns), the Colour Index showed low 
to moderate use of the chemicals that was not confirmed in the 3007 
Survey. Conversely, in the case of another chemical (the identity is 
not given due to business confidentiality concerns), the 3007 Survey 
indicated significant use in the production of TAM dyes, while the 
Colour Index did not. In cases where we had these discrepancies, we 
relied on the source that showed use and assumed that these chemicals 
may be used in production.
    In choosing core constituents of concern for a concentration-based 
listing for filter aids and TAM sludges, we considered adding other 
constituents shown in Table III-2. We considered these chemicals 
because they were detected with a moderate frequency, they had some use 
in manufacturing the dye and pigment products of concern, or they are 
in a class of compounds that have been historically linked to dye 
production (benzidines). However, we believe that these constituents 
are unlikely to be present in these two specific wastes at levels of 
concern. Some of the chemicals in Table III-2 could not be linked to 
the production of the dye and pigment classes at issue. We did not 
include chemicals in the final list of core constituents of concern 
unless we could find some evidence that the presence of a chemical was 
related to the production of the classes of the dyes and pigments of 
interest (for filter aids, the production of azo, TAM, or anthraquinone 
products; for TAM sludges, the production of TAM products, excluding 
TAM pigments using aniline as a feedstock). This is because many waste 
samples were wastewaters or sludges collected from combined wastewater 
treatment systems, and such systems typically receive waste streams 
from various other production processes at facilities. We did not 
include other chemicals because they were never or rarely detected in 
EPA's analysis.

                                        Table III-1.--Core Constituents of Concern in Filter Aids and TAM Sludges
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                      Core constituents
                                        of concern for
            Constituent                filter aids (FA)          Frequency of detection\1\         Use in production of dye            Comments
                                      and/or TAM sludges                                            and pigment classes\2\
                                             (T)
--------------------------------------------------------------------------------------------------------------------------------------------------------
Aniline............................  FA                   High; S...............................  High use (Azo); some use    ..........................
                                                                                                   in TAM pigment (aniline
                                                                                                   based)
Benzaldehyde.......................  FA, T                Not analyzed..........................  Moderate use in TAM         Not analyzed, but common
                                                                                                   products**.                 reactant in TAM
                                                                                                                               production.
Chloroaniline, p-..................  FA                   Moderate, S...........................  Rare use (Azo)............  Aromatic amine; possible
                                                                                                                               contaminant.
Cresol, p-.........................  FA                   Moderate, S...........................  Low use (Azo) found in      Industry split samples did
                                                                                                   Colour Index;**.            not distinguish meta and
                                                                                                                               para isomers.
Dimethoxybenzidine, 3,3'-..........  FA                   Low, S................................  Moderate use (Azo)          ..........................
Dimethylaniline, N,N-..............  FA, T                Rare..................................  Moderate to high use found  Rarely detected, but TAM
                                                                                                   for TAM dye production;     waste not sampled and
                                                                                                   rare use otherwise.         common reactant in TAM
                                                                                                                               production.
Diphenylamine......................  FA, T                Moderate..............................  Low use (Azo); rare use in  Indistinguishable from N-
                                                                                                   TAMs.                       Nitrosodiphenylamine by
                                                                                                                               EPA method (GC/MS).
Diphenylhydrazine, 1,2-............  FA                   Moderate..............................  None reported.............  Possible oxidation product
                                                                                                                               of aniline;
                                                                                                                               indistinguishable from
                                                                                                                               azobenzene by EPA method
                                                                                                                               (GC/MS).
Formaldehyde.......................  FA, T                Moderate, S...........................  Moderate use for TAM; low   ..........................
                                                                                                   use for others
Naphthalene........................  FA                   Moderate/High.........................  None reported.............  Possible impurity in
                                                                                                                               common Azo raw material
                                                                                                                               (beta-naphthol).
Phenol.............................  FA                   Moderate/High, S......................  Moderate use (Azo)........  ..........................
Phenylenediamine, p-(4-              FA                   Low/Moderate..........................  Moderate use (Azo)........  Possible hydrolysis
 aminoaniline).                                                                                                                product of other azo raw
                                                                                                                               materials
                                                                                                                               (aminoacetoacetanilide);
                                                                                                                               indistinguishable from o-
                                                                                                                               isomer in EPA analysis.

[[Page 40201]]

 
Toluidine, o-(2-aminotoluene)......  FA, T                Moderate, S...........................  Moderate use (Azo); low     Hydrolysis product of raw
                                                                                                   use (TAM).                  materials (AAOT); EPA
                                                                                                                               could not separate o-and
                                                                                                                               p-isomers during
                                                                                                                               analysis.
Toluidine, p-(4-aminotoluene)......  FA, T                Moderate, S...........................  Low to moderate uses (TAM   EPA could not separate o-
                                                                                                   and anthraquinone).         and p-isomers during
                                                                                                                               analysis.
(**)
(**)
--------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ As found in EPA analysis of samples of all dye and pigment wastes from production of azo, TAM, and anthraquinone dyes/pigments and FD& C colorants;
  ``ND'' means not detected; ``S'' denotes reported in industry split samples.
\2\ From the Colour Index International, 3rd edition, 1996.
**Relevant data are not included at the present time for a number of constituents due to business confidentiality concerns.


                              Table III-2.--Other Constituents of Possible Concern
----------------------------------------------------------------------------------------------------------------
                                                                      Use in
                                                                  production of
         Constituent              Frequency of detection \1\     dye and pigment             Comments
                                                                   classes \2\
----------------------------------------------------------------------------------------------------------------
Benzene......................  Moderate, S.....................  None reported..  Found in waste, but no use;
                                                                                   common contaminant from many
                                                                                   industrial processes.
Benzidine....................  Low.............................  No reported use  Used historically (Azo), but
                                                                  domestically.    no current domestic use
                                                                                   reported; only found in
                                                                                   wastes from processes that do
                                                                                   not use filter aids.
Chlorobenzene................  Moderate, S.....................  None reported..  No known use; other uses as
                                                                                   solvent.
Chloroform...................  Moderate, S.....................  None reported..  No use; contaminant from
                                                                                   treated water supplies; other
                                                                                   uses as solvent.
Dichlorobenzene, 1,2-........  Moderate........................  None reported..  No use in azo/TAM/
                                                                                   anthraquinone production;
                                                                                   solvent uses in other dye
                                                                                   production (Oxazine dyes).\2\
Phenylenediamine, o-(2-        (See comments)..................  Low use          EPA found analytical methods
 aminoaniline).                                                   (anthraquinone   unreliable (very poor
                                                                  ).               recoveries); may be
                                                                                   indistinguishable from p-
                                                                                   isomer.
Toluidine, 5-nitro-o-(2-       ND, S...........................  Moderate use     Not detected in any EPA
 methyl-5-nitroaniline).                                          (Azo).           samples of azo wastes and
                                                                                   reported in only 1 industry
                                                                                   sample.
(**)
----------------------------------------------------------------------------------------------------------------
\1\ As found in EPA analysis of samples of all dye and pigment wastes from production of azo, TAM, and
  anthraquinone dyes/pigments and FD& C colorants; ``ND'' means not detected; ``S'' denotes reported in industry
  split samples.
\2\ From the Colour Index International, 3rd edition, 1996.
** Relevant data are not included at the present time for a number of constituents due to business
  confidentiality concerns.

    We believe that using analytical data from all dye and pigment 
wastes sampled is clearly appropriate for filter aids. This is because 
filter aids are used to treat and purify a wide variety of wastes 
derived from all of the classes of dye and pigment products (azo, 
triarylmethane, and anthraquinone). The shorter list for TAM sludges 
also is appropriate, due to the more limited set of potential waste 
constituents for this single dye and pigment class. We calculated 
concentration limits for all constituents in Tables III-1 and III-2 for 
both spent filter aids and TAM sludges, as we describe later in this 
notice.
    We are seeking comment on whether the constituents of concern we 
selected are appropriate for the concentration-based listings for the 
two wastes under consideration. We are interested in any information on 
the potential for these, or any other constituents in Table III-2, to 
be in these wastes at levels of concern. We believe that it is 
reasonable to select constituents that we can link to the dye and 
pigment processes under evaluation. To require testing for an extensive 
list of constituents without adequate reason would lead to unnecessary 
analysis by industry in evaluating if their wastes meet the listing 
levels. After considering information provided in comments on today's 
proposed rule, we may choose to add potential constituents from Table 
III-2, or delete proposed constituents for the two wastes.
Analytical Issues
    We found problems in our chemical analysis of dye and pigment waste 
samples for some of the constituents in Table III-1. In a few cases, 
our analyses could not distinguish between two compounds when we used 
the usual EPA methods for semivolatile organic chemicals, GC/MS method 
8270 in Test Methods for Evaluating Solid Wastes, Physical/Chemical 
Methods; SW-846, hereafter called SW-846). We found problems for four 
pairs of compounds: diphenylamine/N-nitrosodiphenylamine; 1,2-
diphenylhydrazine/azobenzene; o-toluidine/p-toluidine; and o-
phenylenediamine/p-phenylenediamine. We propose to deal with these 
problems as outlined below.
    N-Nitrosodiphenylamine breaks down to diphenylamine in the method 
we used; therefore these two chemicals could not be distinguished. This 
means

[[Page 40202]]

that detection by this method could be due to either compound being in 
the waste. We found no reported use of the N-nitroso-derivative, but we 
did find diphenylamine has some use in the production of azo and TAM 
products. Therefore, for this pair we selected diphenylamine as the 
likely constituent of concern. This means that, if we finalize 
diphenylamine as a constituent in the concentration based listings, 
generators would analyze for this constituent and assume any 
concentration measured is diphenylamine.
    Similarly, we could not distinguish the compounds 1,2-
diphenylhydrazine and azobenzene in the analytical method used, because 
these chemicals interconvert readily under analytical conditions. Thus, 
our data showed that one or both of these compounds were present in 
waste samples, but we could not tell which one. In this case, we did 
not find any reported use of either chemical in dye or pigment 
production processes. However we believe that the presence of either 
may be explained by oxidation of aniline from processes that use 
aniline as a reactant. Thus, in this case we are proposing to include 
the constituent with the lower concentration level (1,2-
diphenylhydrazine) to be protective. This means that generators would 
analyze their waste for the total level of 1,2-diphenylhydrazine/
azobenzene, and assume that the amount detected is due only to the more 
toxic 1,2-diphenylhydrazine. This is also reasonable because these 
compounds may readily interconvert in wastes or the environment, thus 
it is prudent to set the listing level for the more toxic component.
    In our analysis we also could not separate two isomers of toluidine 
(o-toluidine and p-toluidine) and phenylenediamine (o-phenylenediamine 
and p-phenylenediamine). While it may be possible to distinguish these 
isomers using other analytical methods, we have no data at this time to 
indicate this. For the toluidine isomers, we are proposing to include 
both isomers as constituents of concern. If generators cannot separate 
these isomers, they could determine a total quantity for both. In the 
absence of information on which isomer is expected in the waste, 
generators would assume that the measured concentration is due to the 
more toxic o-toluidine. Generators could use their knowledge of their 
production processes, however, to definitively rule out the presence of 
one of the isomers, and in this way identify which isomer is present. 
For example, if generators know that only one isomer is used in any of 
the relevant processes, they could document this and claim this as part 
of their determination. Note that the risk-based concentration levels 
we propose to set for these two chemicals are similar (i.e, they differ 
by less than a factor of two for both wastes), thus the practical 
distinction between these isomers is relatively unimportant, unless 
generators measure them at levels approaching the listing levels.
    For the o- and p-phenylenediamine isomers, we reviewed the 
analytical data and now believe that o-phenylenediamine cannot be 
reliably measured. We found that we could not reliably recover the 
chemical from samples with known concentrations (spiked samples). In 
addition, the reported usage of o-phenylenediamine in the production of 
dyes and pigments is relatively limited compared to the use of p-
phenylenediamine (see Colour Index, vol. 4, page 4822). Furthermore, p-
phenylenediamine may also form from the degradation of a widely used 
azo precursor, p-aminoacetoacetanilide. Therefore, because of these 
analytical problems, and also because its use in dye or pigment 
production is limited, we are proposing not to include o-
phenylenediamine in the list of constituents of concern for either 
waste. Thus, if we finalize phenylenediamine as a constituent of 
concern for filter aids, generators would be required only to determine 
if p-phenylenediamine is present in their wastes below the listing 
levels.
    We seek comment on these analytical issues associated with the 
potential constituents of concern. We are especially interested in any 
information on methods that may reliably resolve the analytical 
problems noted above. We also seek comment on the problematic chemicals 
we identified, and whether EPA should adopt another approach. One 
approach might be to simply avoid using any of these compounds on the 
list of constituents of concern due to the analytical problems. 
However, due to their potential importance, we believe at this time 
that the above approach is a reasonable attempt to use these chemicals 
in setting listing levels. Another approach would be to use the 
approach described for the 1,2-diphenylhydrazine/azobenzene pair, i.e., 
if the generators cannot resolve the constituents in the chemical 
analysis, they would always assume that the more toxic constituent was 
in fact present. We believe this may be overly conservative in some 
cases, but solicit comment on this and other possible approaches.
2. Choosing the Risk Assessment Scenarios To Evaluate
    For both filter aids and TAM sludges, we evaluated the scenario of 
disposal in unlined municipal landfills and assessed the impact of the 
release of leachate from these landfills to the groundwater. In past 
listings we have found that landfill disposal of wastewater treatment 
sludges and similar solids is quite common (e.g., see EPA's recent 
listing for petroleum refining wastes, 63 FR 42110; August 6, 1998). 
The updated information we collected for both wastes showed that some 
generators sent these wastes to municipal landfills. In both cases, EPA 
chose to evaluate this scenario. However due to constraints on release 
of information claimed as CBI, we cannot discuss in detail the 
prevalence of this disposal practice or the extent of other practices.
    We used the updated 1997 waste volumes (i.e., waste quantities) 
reported by facilities in our modeling of potential releases from 
municipal landfills. In the case of filter aids, we combined the filter 
aids generated by each facility and arrayed these combined waste 
volumes into a distribution that would represent quantities of filter 
aids that go to municipal landfills. We then used this distribution of 
waste volumes as a key input parameter into our modeling.
    For TAM sludges (excluding sludges associated with TAM pigments 
using aniline as a feedstock), the updated data showed few generators 
of this waste. One facility sent 57 metric tons of sludge derived 
solely from the production of TAM dyes or pigments to a municipal 
landfill. This specific sludge was generated from wastewater that arose 
from the production of TAM products, and did not include wastewaters 
from other production processes. We cannot discuss the volumes or 
management practices of the other facilities at this time due to CBI 
constraints. We used the one volume associated with the dedicated 
sludge in all modeling for TAM sludge disposal in municipal landfills.
    Under Federal regulations, generators are free to send either waste 
to any Subtitle D municipal landfill. We assumed that any municipal 
landfill described in EPA's nation-wide distribution of municipal 
landfills was possible, with some geographic limitations reflecting the 
locations of the dye and pigment manufacturers (described further 
below). Therefore, we used the distribution of data available for each 
of the parameters needed to model potential risk associated with 
disposal of dye and pigment waste

[[Page 40203]]

streams in municipal landfills. The primary source of data from which 
we selected key modeling inputs (e.g., surface area, active life, 
distance to well) is EPA's 1988 National Survey of Solid Waste 
Municipal Landfill Facilities. These parameters are described in more 
detail in the Risk Assessment Background Document (Section 4).
    EPA has promulgated regulations governing the design and operation 
of municipal landfills (see 40 CFR Part 258), and our modeling 
assumptions reflected some of these requirements when appropriate 
(e.g., daily cover). We chose to model a landfill without the full 
liner system described in the regulations, because it is reasonable to 
assume that many landfills now and in the future may not have synthetic 
liners. For example, the design criteria in 258.40 apply only to new 
units or lateral expansions of existing units. Existing landfills 
(i.e., those in existence prior to the effective date as defined in 
Sec. 258.1(e)) do not have to meet the design requirements in 
Sec. 258.40 (e.g., liner systems). Furthermore, the regulations allow 
exemptions from the standards depending on the location and size of the 
landfill (Section 258.1(f)), and States may approve alternative designs 
for new units or lateral expansions based on performance standards 
(Sec. 258.40(a)(1)). Finally, EPA is in the process of authorizing 
States to implement the municipal landfill regulations, and States are 
still working to issue permits and bring all landfills up to the 
regulatory requirements. Given the existing exemptions in the 
regulations, and the uncertainty in how many landfills have liner 
systems, we believe it is prudent to base our modeling on landfills 
without a liner.
    Another reason the modeling of unlined landfills appears prudent is 
because industrial wastes also can go to unlined landfills that do not 
take municipal waste (i.e., industrial nonhazardous waste landfills), 
and thus would not be subject to those standards. We are unaware of any 
legal requirement that these wastes could not go to such non-municipal 
waste landfills. Given the similarities in the disposal practices 
(municipal and industrial nonhazardous waste landfills), we believe 
that an unlined landfill scenario is reasonable.
    EPA used the approximate geographic locations of the facilities 
that generated spent filter aids and TAM sludges to estimate location 
parameters needed to conduct the risk assessment. We used geographic 
location to identify the soil, climate, and hydrogeologic parameters 
used in the fate and transport modeling. Location related parameters 
required for the risk assessment and specific inputs and data 
distributions used to model risk from these units are described in 
detail in the Risk Assessment Background Document (Section 4).
    As noted above, there is uncertainty in how many landfills that 
might receive these waste have liner systems in place. EPA acknowledges 
that a liner system would serve to contain waste leachate, and would 
lessen the risk while such a liner system was intact. We seek comment 
as to whether an alternative regulatory approach should be taken for 
wastes sent to landfills with liners or certain environmental controls.
3. The Receptors and Exposure Pathways Evaluated
    The primary receptors we considered in this analysis are adults and 
children exposed via ingestion (i.e., drinking water) and noningestion 
(e.g. showering) exposure pathways to water from groundwater wells 
contaminated by the leachate from the municipal landfill receiving 
filter aid or TAM sludge wastes. We considered only receptors with 
residential drinking water wells for the groundwater pathway. We 
assumed all community wells and other municipal water supplies are 
treated and, therefore, would not be contaminated with constituents 
from the wastes of concern.
    We also evaluated receptors from nongroundwater pathways in our 
sensitivity analysis. We assumed the receptors for these pathways were 
farmers and their children who live in close proximity to the municipal 
landfill. We chose these receptors because their exposure results in 
the highest potential risk for nongroundwater pathways, which was 
appropriate for the initial sensitivity or screening analysis. 
Nongroundwater exposure pathways for filter aids and TAM sludges 
disposed in municipal landfills result from the emission of vapors from 
these landfilled wastes. We evaluated exposure from both direct and 
indirect nongroundwater pathways. The direct pathway consists of 
dispersal of vapors from the landfill through the air pathway directly 
to the receptor via the inhalation. Indirect pathways include 
deposition to soil, transfer to fruits, vegetables, grain, and forage 
(air-to-plant transfer and soil-to-plant transfer), and uptake by 
grazing animals. The plant and animal products are then consumed by the 
farm family.

E. How Did EPA Estimate Exposure Concentrations?

1. Risk Assessment Methods
    To calculate listing levels for constituents of concern, we needed 
to determine what concentrations at the point of exposure would be 
associated with levels in the wastes. We conducted the risk assessment 
in three stages: (1) the sensitivity analysis, (2) the deterministic 
analysis, and (3) the probabilistic analysis for the groundwater 
pathways. For the nongroundwater pathways, the Agency used results from 
the sensitivity analysis to screen out nongroundwater risks, because 
they were not significant relative to potential groundwater risks 
associated with disposal of wastes in landfills.
    a. Sensitivity Analysis. The purpose of our sensitivity analysis 
was to identify the most sensitive or risk-driving parameters in the 
risk assessment model and to determine high-end and central tendency 
values for subsequent use in the deterministic analysis. A high-end 
parameter corresponds to its 90th or 10th percentile value depending on 
whether a high or low value of that parameter results in a higher 
predicted risk. We conducted the sensitivity analysis by varying each 
parameter or set of linked parameters to high ends one at a time, while 
holding all other variables in the analysis at central tendency. We 
then compared the risk results using a single high-end parameter to the 
results obtained when all values are set at central tendency. Using 
this method, we identified the two most sensitive high end parameters 
that resulted in the highest risks. We then set these parameters to 
their high-end values in the subsequent deterministic analysis. For the 
groundwater pathway, we used the sensitivity analysis to identify high-
end parameters for use in the deterministic assessment of risk from 
groundwater.
    For the nongroundwater pathway, we were able to use the results 
from the sensitivity analysis as a screening level analysis of 
nongroundwater risks. Originally, we intended to use the nongroundwater 
sensitivity analysis to identify the most sensitive parameters for use 
in a deterministic analysis of nongroundwater risks from the dye and 
pigment waste streams. However, we were able to use the results of the 
nongroundwater sensitivity analysis to screen out or eliminate 
nongroundwater risks as a primary concern for dye and pigment industry 
wastes. We screened out nongroundwater risks by comparing the results 
of the nongroundwater sensitivity analysis to the results of the

[[Page 40204]]

groundwater sensitivity analysis, which we performed using the same 
inputs for common parameters. In all cases, the groundwater risk 
analysis produced higher risk estimates for all constituents. Since the 
purpose of this analysis was to set risk-based concentration limits, we 
focused our analysis on the pathway of most concern (i.e., highest 
risk) to determine protective concentrations. Because the groundwater 
pathway presented the highest risk, we only evaluated the groundwater 
pathway further using deterministic and Monte Carlo analyses. In other 
words, risk-based concentrations set based on groundwater pathway risks 
will also be protective of nongroundwater pathway risks. Based on this 
finding, no further modeling of nongroundwater risks was conducted. The 
Risk Assessment Background Document describes the sensitivity analysis 
for both groundwater and nongroundwater pathways and presents the 
results in Appendices A and H.
    b. Deterministic Analysis. The ``deterministic'' method uses single 
values for input parameters in the models to produce a point estimate 
of risk or hazard. For this analysis, we used a double high-end risk 
assessment. In this method, we set the two parameters identified to be 
most sensitive at their high-end values and all other parameters are 
set at central tendency. A central tendency risk estimate is the point 
estimate in which all variables are set at central tendency values. We 
presume the high-end risk estimate to be a plausible estimate of 
individual risk for those persons at the upper end of the risk 
distribution. By using these descriptors we intend to convey estimates 
of exposure in the upper end of the distribution (i.e., above the 90th 
percentile), while avoiding estimates that are beyond the true 
distribution. (See the EPA guidance memo entitled, Guidance on Risk 
Characterization for Risk Managers, 1992; hereafter known as the 
Habicht memo, 1992). We applied the deterministic methodology to assess 
groundwater pathway risks from disposal of spent filter aid and TAM 
sludges in municipal landfills. The parameters that we found to be the 
two key high-end parameters varied somewhat by chemical and waste. 
However, these parameters were some combination of waste quantity, well 
location, and duration of exposure.
    c. Probabilistic Analysis (Monte Carlo Method). In the 
probabilistic analysis, we vary sensitive parameters for which 
distributions of data are available. Parameters varied for this 
analysis include waste volumes, landfill size, parameters related to 
the location of the landfill such as climate and hydrogeologic data, 
location of the receptor, and exposure factors (e.g., drinking water 
ingestion rates). The probabilistic analysis is conducted using a Monte 
Carlo methodology. Monte Carlo analysis provides a means of quantifying 
some variability and uncertainty in risk assessments by using 
distributions that describe the full range of values that the various 
input parameters may have. Some of the parameters in the probabilistic 
analysis are set as constant values because (1) there are insufficient 
data to develop a distribution, (2) simplifying assumptions are made, 
(3) site specific constants are available, or (4) the analysis has not 
been shown to be sensitive to the values of the parameter, that is, 
even if the parameter is varied, the risk results do not vary 
significantly.
    Monte Carlo simulation is a statistical technique that calculates 
an individual risk value or hazard quotient for each category of 
parameters that affect or determine risk. For each calculation, the 
Monte Carlo simulation uses parameter values that are randomly selected 
from the distribution of values available for each parameter. The range 
of values selected for the input parameters reflects the distribution 
of values corresponding to each input parameter. The repetitive 
calculations take many randomly selected combinations of input 
parameters to generate a range of risk results. Based on the 
distribution of the output, we can determine a risk or hazard level 
representing the high end (e.g., 90th or 95th percentile) or central 
tendency (i.e., 50th percentile). Although the simulation is internally 
complex, commercial software performs the calculations as a single 
operation, presenting a distribution of risk results. From these 
results, we can determine the percentile distribution of exposure point 
concentrations and risks for the selected risk assessment scenario. We 
assessed potential groundwater pathway risks from disposal of filter 
aid and TAM wastes in municipal landfills using the probabilistic risk 
assessment method.
    Monte Carlo simulation can be used to simulate the effects of 
natural variability and informational uncertainty that often accompany 
many actual environmental conditions. Further, information on the range 
and likelihood of possible values for these parameters is produced 
using this technique. When compared with alternative approaches for 
assessing parameter uncertainty or variability, the Monte Carlo 
technique has the advantages of very general applicability, no inherent 
restrictions on input distributions or input-output relationships, and 
relatively straightforward computations. Also, Monte Carlo application 
results can be used to satisfactorily calculate uncertainty, and to 
quantify the degree of conservatism used. With deterministic analyses, 
an alternative to Monte Carlo, it is often not possible to quantify the 
level of protection represented by the results. However, some potential 
limitations may exist when applying Monte Carlo techniques in modeling 
efforts. Variability (inherent variation in a measure over time and 
space) and uncertainty (lack of knowledge) are often difficult to 
distinguish within applications. Also, one must account for 
correlations among the various data parameters to avoid distorting 
results. As explained in Section III.H, we relied on the Monte Carlo 
approach to set listing levels for today's proposal.
2. Fate and Transport Modeling
    The risk analysis employs several key fate and transport models. 
The models include a landfill partitioning model based upon the 
equations presented in a series of articles by Jury et al. We used this 
model to estimate the concentration of leachate from the landfill and 
the emission rate for volatile constituents from the landfill. We 
applied EPA's Industrial Source Complex Short Term, version 3 (ISCST3) 
to estimate the dispersion and deposition of vapors emitted from the 
municipal landfill. For estimating the concentration of constituents of 
concern at the residential drinking water well, we used the groundwater 
model EPACMTP or EPA's Composite Model for Leachate Migration with 
Transformation Products. Further details and references for these 
models are presented in the Risk Assessment Background Document 
(Section 5.2.2).
    a. Landfill Partitioning Model. We used the Jury equations to 
estimate fate and transport of constituents in the nongroundwater 
pathways from the landfill to the receptor and to estimate leachate 
from the landfill. Using a model based on the Jury equations, we 
projected the contaminant loss from a landfill due to volatilization, 
run-off, degradation, and leaching. The Jury equations partition the 
waste in the landfill to waste, air, and pore water and calculate 
potential losses from leaching, volatilization, and degradation. The 
landfill partitioning model evaluates contaminant losses over both the 
active waste disposal period and after the landfill is closed. We used 
the landfill partitioning model to conduct the

[[Page 40205]]

sensitivity, deterministic, and Monte Carlo analyses.
    b. Air Model. We used the ISCST3 air dispersion and deposition 
model to estimate the vapor air concentrations and deposition rates 
needed to develop relative risk estimates associated with vapor air 
emissions from the municipal landfill. We estimated air pathway risks 
using emissions estimates from the landfill partitioning model as 
inputs to the ISCST3 air model, and using ISCST3 to estimate the air 
concentration and deposition of vapor for each constituent at receptor 
locations. This modeling step was only needed for the sensitivity 
analysis to estimate risks from non-groundwater pathways.
    c. Groundwater Model. We used the EPACMTP groundwater model to 
estimate the concentration of constituents of concern at the 
residential drinking water well. We conducted the groundwater modeling 
using six surrogate compounds to represent the movement of all 
constituents of concern through the groundwater pathway. Identification 
of surrogate compounds provides a means of minimizing the modeling runs 
required to model the large number of constituents evaluated for this 
assessment. For this assessment, organic constituents are grouped into 
six categories based on like chemical and physical properties. Sorption 
potential and hydrolysis rate are the key parameters used to group 
constituents; however, for the constituents of concern in today's 
proposed rule, hydrolysis was not important. Therefore, the only 
constituent-specific parameter of importance for transport of the 
organic compounds of interest was the sorption potential (i.e., the 
organic carbon partition coefficient, Koc; this is a measure 
of the tendency for a chemical to adsorb to organic material in soils). 
For computational efficiency, we only modeled the surrogate constituent 
in each category, and then applied the modeling results for the 
surrogate to each constituent in the category. We found that the 
dilution and attenuation of the constituents we evaluated did not vary 
significantly (i.e., less that a factor of 2), even with larger 
differences in Koc. Thus, the use of surrogates did not 
introduce any appreciable uncertainty into the final results. See 
Appendix C of the Risk Assessment Background Document for details of 
the designation of constituent categories and identification of 
surrogate compounds.
    We used the EPACMPT model to conduct the sensitivity analysis, 
deterministic analysis, and Monte Carlo analysis for the groundwater 
pathway. The groundwater pathway modeling yields the groundwater 
exposure concentrations resulting from the release of waste 
constituents from the landfill. Precipitation that percolates through 
the waste unit generates leachate, which can infiltrate from the bottom 
of the landfill into the subsurface. The waste constituents dissolved 
in the leachate (as predicted by the partitioning model) are then 
transported via aqueous phase migration through the vadose zone to the 
underlying saturated zone and then down gradient to a ground water 
receptor well. We project the concentration at the intake point of a 
hypothetical groundwater drinking water well or receptor well, located 
at a specified distance from the down gradient edge of the waste 
management unit.
    We located the residential wells down gradient from the landfill 
and within the top ten meters of a plume of groundwater contaminated by 
the leachate from the municipal landfill. As noted previously, we used 
distances of receptor wells from waste management units from EPA's 
National Survey of Municipal Landfills. The distance from the landfill 
to the receptor well, and the location of the well in relation to the 
plume of contaminated groundwater, are important parameters in the 
groundwater model. This is because the projected concentrations of 
constituents at the well, and the corresponding risks, increase as the 
well location is moved closer to the source within the plume.
    For the Monte Carlo analysis, we placed the receptor well 
downgradient from the waste management unit at a radial distance of up 
to 1,610 m; the distance for each simulation was taken from the 
distribution of distances gathered by EPA in its survey noted above. We 
assumed the lateral location of the well to be randomly distributed 
within the estimated lateral extent of the plume. For the deterministic 
analysis, the downgradient receptor well location was fixed within the 
lateral extent of the plume (most often at the high end value of 102 
meters from the landfill).
    The objective of this ground-water modeling was to compute the 
amount of dilution and attenuation a contaminant may undergo as it 
migrates from a landfill to a ground-water well. The amount of dilution 
and attenuation is expressed as a dilution/attenuation factor (DAF), 
which represents the ratio of the initial leachate concentration 
leaving the landfill to the ground-water receptor well concentration. 
The high-end DAFs for the different constituents did not vary much for 
the two wastes, i.e., the DAFs were in the range of 3 to 5.
    The groundwater model accounts for the following processes 
affecting contaminant fate and transport: advection, hydrodynamic 
dispersion, linear or nonlinear equilibrium sorption, chained first-
order decay reactions, and dilution from recharge in the saturated 
zone. EPACMTP was run in both deterministic mode and Monte Carlo mode. 
In the deterministic mode, we set the two most sensitive variables to 
their high end values, while keeping all other parameters set at 
central tendency. In the probabilistic Monte Carlo mode, the model 
randomly selected parameter values from their respective statistical 
distributions. The Monte Carlo procedure allows assessment of the 
uncertainty associated with ground-water well concentrations that 
result from uncertainty and variability in climatic and hydrogeologic 
characteristics of waste management units across the range of locations 
associated with the Dyes and Pigments industry.

F. What Exposure Assumptions and Toxicity Levels Did EPA Use?

    We used values from EPA's Exposure Factors Handbook (EPA, 1997) to 
set the exposure assumptions for this analysis. We applied the 
recommended values for the central tendency and high end intake rates 
in the deterministic analysis, and we used a distribution of values 
developed from the data presented in the Exposure Factors Handbook in 
the Monte Carlo analysis. Section 6.0 of the Risk Assessment Background 
Document discusses these values in detail.
    The health benchmark data used in the analysis are based upon the 
values presented in the Integrated Risk Information System (IRIS) 
online database of verified health benchmarks or in the Health Effects 
Assessment Summary Tables (HEAST) document. Appendix E of the Risk 
Assessment Background Document contains toxicological profiles used in 
our analysis. The studies used as the basis for these benchmarks have 
been reviewed and summaries of these studies, along with references to 
the complete studies, are presented in Appendix E of the Risk 
Assessment Background Document.

G. What Uncertainties Are Associated With The Risk Assessment?

    Uncertainty is inherent in the risk assessment process. It occurs 
because the risk assessment process is complex, and variability is 
inherent in the environment. We may classify the sources of uncertainty 
as parameter uncertainty and variability, exposure

[[Page 40206]]

scenario uncertainty, and model uncertainty. Parameter uncertainty 
occurs when parameters appearing in equations cannot be measured 
precisely and/or accurately. Variability refers to the normal 
variations in physical and biological processes that we cannot reduce 
with additional data. We have addressed variability in this risk 
assessment by using a probabilistic analysis. Exposure scenario 
uncertainty occurs because of the inability to measure exposure of 
receptors to constituents of concern. Model uncertainty is associated 
with all models used in risk assessment and occurs because computer 
models require simplifications of reality, and thus exclude some 
variables and interactions that influence fate and transport but cannot 
be included in models due to complexity or lack of data. We discuss 
each of these issues in detail in Section 8 of the Risk Assessment 
Background Document.
    One important area of uncertainty that we believe should be noted 
is the uncertainty involving estimates of risks to children from 
carcinogenic compounds. We used the same overall approach for 
estimating cancer risks in both adults and children from the dye and 
pigment waste streams evaluated. We modified the exposure factors for 
children to account for differences between adult and child receptors 
(e.g., body weight, exposure duration). However, we recognize that 
significant uncertainties and unknowns exist regarding the estimation 
of lifetime cancer risks in children. Methodologies for estimating 
environmental threats to children's health are relatively new. They are 
currently being debated within the scientific community, and will 
continue to evolve. The analysis of cancer risks in children undertaken 
for this assessment has not been externally peer reviewed.

H. What Risk Level Do the Concentration Levels Represent?

    In calculating concentration limits for the two wastes, we assumed 
the residential drinking water well concentration is equal to EPA 
established protective or health-based level for each constituent for 
the most sensitive receptor (adult or child). Protective concentrations 
are those at which adverse health effects from any single constituent 
present in contaminated drinking water and/or water used for bathing or 
showering do not exceed a one in 100,000 (1  x 10-5) 
individual lifetime cancer risk or a non-cancer hazard quotient of 1 
(where the hazard quotient is the ratio of the concentration in the 
water to the concentration at which no non-cancer effects are 
expected). The use of these risk levels is consistent with the initial 
cancer-risk and HQ ``levels of concern'' that we described in the 
discussion on EPA's hazardous waste listing policy in the 1994 proposed 
rule for dye pigment wastes (see 59 FR 66075). As noted previously, we 
based the concentrations on the groundwater pathway, which is the 
pathway of most concern for all constituents of concern for this 
industry when disposed in municipal landfills. Section 5 of the Risk 
Assessment Background Document provides the methodology we used to 
derive risk limiting waste concentrations in greater detail.

I. What Are the Proposed Listing Levels?

    Table III-3 presents the risk-based concentration levels for all 
potential constituents of concern calculated for both spent Filter Aids 
and TAM sludges based on our risk assessment. These levels represent 
protective concentrations for constituents that may be present in the 
wastes, and are based on the receptor that yielded the lowest allowable 
waste concentration (i.e, adult or child). Using the partitioning model 
described above, we calculated protective levels for constituents in 
both the waste itself and for leachate that is released from the 
landfill. We are proposing to set the concentration levels in the 
listing at the levels calculated for the constituents in the two 
wastes. If you generate either waste under consideration, your waste 
concentrations would have to be below these levels, or else your waste 
will be a listed hazardous waste. Therefore, under this proposal, you 
would be assessing constituent concentrations in the waste itself.
1. Selection of Listing Levels in Wastes Versus Leachate
    We considered using the landfill leachate levels in Table III-2 
instead of the waste levels to define the listed waste. We could do 
this if we require generators to evaluate their wastes using a test 
designed to predict leaching from landfills. The Toxicity 
Characteristic Leaching Procedure (TCLP) is one possible method 
available. The Toxicity Characteristic (TC) regulation uses the TCLP to 
decide whether wastes are hazardous under this characteristic (see 40 
CFR 261.24). However, we decided not to use the TCLP approach for 
several reasons. First, we did not perform TCLP analysis for these 
constituents in any of the dye and pigment wastes examined. Thus, we 
are uncertain how the method might perform for the wastes at issue. The 
partitioning model also factors in the placement of the wastes into the 
landfill and provides a leaching rate that reflects how the volumes of 
wastes are assumed to be disposed over time. The TCLP approach is 
appropriate for defining levels of concern under the TC for all wastes 
on a nationwide basis, where we have no specific information on waste 
quantities disposed. In today's proposed rule we have information on 
the specific quantities of the two selected wastes in the dyes and 
pigments industries. Finally, we believe that the analysis of the waste 
itself is more straightforward to implement, and would not require 
measuring levels in a derived leachate that are much lower than those 
in the waste. Therefore, we chose to propose the concentration based 
levels for the waste itself.
    However, the TCLP does represent an actual measurement of leach 
potential as opposed to a value generated by a model. Thus, the Agency 
may still consider a final regulation based on the TCLP, depending on 
comments received and additional information provided.
2. Selection of Probabilistic Versus Deterministic Modeling Results
    The constituent concentrations in Table III-3 reflect the results 
of the probabilistic modeling assessment. We chose to use the 
probabilistic results, rather than rely on the deterministic results. 
While the Agency has used the results of deterministic analyses for 
past listing decisions, EPA has more recently used Monte Carlo analyses 
for additional verification (see Petroleum Listing final rule, 63 FR 
42110; August 6, 1998). As we have developed and refined the Monte 
Carlo approach, we believe it provides some distinct advantages. As 
noted earlier, when compared with alternative approaches for assessing 
parameter uncertainty or variability, the probabilistic technique has 
the advantages of general applicability and no inherent restrictions on 
input distributions or input-output relationships.
    An additional factor the Agency considered was the highly variable 
nature of the data available. The constituents of concern, their 
concentrations, and waste volumes can be highly variable across the 
different industry processes, a factor which made the Agency reluctant 
to rely on selected point estimates for its assessment. Also of 
particular concern was the difficulty we found in choosing what set of 
parameters would truly represent a ``high-end'' analysis for multiple 
pathways, constituents, and locations. The issues associated with 
choosing high-end parameters are discussed in the Risk Assessment 
Background

[[Page 40207]]

Document, which presents the deterministic as well as the probabilistic 
results.
    The probabilistic simulations used in this proposed rulemaking 
assessed the full distributions of critical input data (e.g., distance 
to well, waste volumes, landfill area) to randomly generate receptor 
well concentrations of key constituents for certain landfill 
situations, and then combined the results from many runs to produce a 
probability distribution of risks. We were then able to choose points 
along the probability distribution of risk for comparison to the high-
end analysis. For example, a risk that corresponds to the 90th 
percentile for a specific waste constituent in a landfill means that 
the risk would be below this level in 90 percent of the runs.
    The concentration levels in Table III-3 represent the probabilistic 
modeling results at the 90th percentile. As discussed previously, we 
are attempting to calculate estimates of exposure in the upper end of 
the distribution (i.e., above the 90th percentile), while avoiding 
estimates that are beyond the true distribution. (See Habicht memo, 
1992.) The Agency's policies do not indicate that there is any 
particular point on a Monte Carlo distribution that should be the point 
at which the Agency regulates or does not regulate. This conceptual 
range is not meant to precisely define the limits of this descriptor, 
but should be used by the assessor as a target range for characterizing 
``high-end risk.'' Therefore, a high-end estimate that falls within the 
range (above the 90th percentile but still realistically on the 
distribution) is a reasonable basis for a decision.
    We believe that the 90th percentile levels calculated for the waste 
concentrations in today's proposed rule are protective. For filter 
aids, the high-end deterministic results gave concentrations that were 
somewhat higher than the 90th percentile levels from the probabilistic 
analysis (by a factor of 2-4 fold). Therefore, we believe that using 
the 90th percentile values (as opposed to higher percentile values) 
provides results that are more consistent with previous listing 
determinations based on high-end deterministic assessments. For TAM 
sludges, the 90th percentile probabilistic levels are also close to the 
deterministic results, although for this waste the probabilistic levels 
for most constituents are slightly above the deterministic values 
(approximately two-fold). Thus, the 90th percentile results appear to 
agree reasonably well overall with the deterministic results. 
Furthermore, the probabilistic DAFs predicted for transport of landfill 
leachate from the landfill to the receptor well were already quite low 
at the 90th percentile (i.e., 2-5), also suggesting that the 90th 
percentile is adequately protective.
    We are soliciting comments on both the use of the probabilistic 
modeling results, rather than the deterministic analyses, and also our 
use of the 90th percentile risk level, rather than any other level. For 
example, the 95th percentile probabilistic results yields 
concentrations that are about two-fold lower. Details of the 
deterministic modeling results, and levels calculated using other 
percentiles from the probabilistic analysis, are given in the Risk 
Assessment Background Document (Appendix F). We also seek comment on 
the setting of the regulatory levels for the waste itself, rather than 
the option of using the TCLP values.

    Table III-3.--Calculated Risk-Based Concentration Levels for Possible Constituents of Concern for Dye and
                                                Pigment Wastes\1\
----------------------------------------------------------------------------------------------------------------
                                                     Concentration levels for      Concentration levels for TAM
                                                          filter aids **                      sludges
                  Constituents                   ---------------------------------------------------------------
                                                                   Leachate (mg/                   Leachate (mg/
                                                   Waste (mg/kg)        ml)        Waste (mg/kg)        ml)
----------------------------------------------------------------------------------------------------------------
Aniline.........................................  ..............  ..............              17        0.03
Benzaldehyde....................................  ..............  ..............            5000        5.6
Benzene.........................................  ..............  ..............             370        0.11
Benzidine.......................................  ..............  ..............           0.027        0.000023
Chloroaniline, p-...............................  ..............  ..............             250        0.25
Chlorobenzene...................................  ..............  ..............              36        0.0036
Chloroform......................................  ..............  ..............             100        0.042
Cresol, p-......................................  ..............  ..............             330        0.33
Dichlorobenzene, 1,2-...........................  ..............  ..............            1100        0.043
Dimethoxybenzidine, 3,3'-.......................  ..............  ..............             520        0.38
Dimethylaniline, N,N-...........................  ..............  ..............             300        0.11
Diphenylamine...................................  ..............  ..............          27,000        1.1
N-Nitrosodiphenylamine..........................  ..............  ..............           7,400        0.62
Diphenylhydrazine, 1,2-.........................  ..............  ..............              31        0.0042
Azobenzene......................................  ..............  ..............             720        0.013
Formaldehyde....................................  ..............  ..............            7000       11
Naphthalene.....................................  ..............  ..............              17        0.0028
Phenol..........................................  ..............  ..............          28,000       34
Phenylenediamine, o-(2-aminoaniline)............  ..............  ..............              61        0.11
Phenylenediamine, p-(4-aminoaniline)............  ..............  ..............           5,000       10
Toluidine, o-(2-aminotoluene)...................  ..............  ..............              13        0.022
Toluidine, p-(4-aminotoluene)...................  ..............  ..............              23        0.029
Toluidine, 5-nitro-o-(2-Methyl-5-nitroaniline)..  ..............  ..............             220        0.15
(**)
----------------------------------------------------------------------------------------------------------------
\1\ Levels represent the 90th percentile risk derived from the probabilistic analysis.
** Relevant data are not included at the present time for a number of constituents due to business
  confidentiality concerns.


[[Page 40208]]

IV. Proposed Listing Determinations and Regulations

A. What Are the Proposed Regulations for the Two Wastes?

    We are proposing that, if you generate either of the two categories 
of dye and pigment wastes at issue, you must either determine whether 
or not your waste is a listed hazardous waste within a specified time, 
or assume that it is hazardous as generated. Your waste would become a 
listed hazardous waste if it contains any of the constituents of 
concern at a concentration equal to or greater than the hazardous 
concentration identified for that constituent. You must make a 
determination that all of the constituents of concern in your waste are 
below the hazardous concentrations to claim that your wastes remain 
nonhazardous. We are proposing the following specific regulatory 
language for the two wastes:

    K167  Spent filter aids, diatomaceous earth, or adsorbents used 
in the production of azo, anthraquinone, or triarylmethane dyes, 
pigments, or FD&C colorants, unless these wastes do not contain any 
of the constituents identified in Sec. 261.32(b)(3)(iii) at a 
concentration equal to or greater than the hazardous level set for 
that constituent as demonstrated by the procedures specified in 
Sec. 261.32(b).
    K168  Wastewater treatment sludges from the production of 
triarylmethane dyes and pigments (excluding triarylmethane pigments 
using aniline as a feedstock), unless these wastes do not contain 
any of the constituents identified in Sec. 261.32(b)(3)(iii) at a 
concentration equal to or greater than the hazardous level set for 
that constituent as demonstrated by the procedures specified in 
Sec. 261.32(b).

    The constituents and levels in these listing descriptions would be 
those given in Tables IV-1 for Filter Aids and Table IV-2 for TAM 
sludges. Section V describes the steps you must follow to implement the 
concentration-based listing.
    We solicit comment on the proposed list of constituents and their 
levels. Specifically, based on the rather high levels set for some 
constituents (e.g., diphenylamine, formaldehyde for TAM sludges), EPA 
is considering removing these. These levels may be unlikely in these 
wastes, and may not merit analysis. We seek any information that may 
assist us in deciding on whether we should retain all of these 
constituents. We also solicit comment as to whether any other 
constituents (e.g., any others in Table III-3) should be added to the 
regulatory lists in Tables IV-1 or IV-2.

         Table IV-1.--Concentration Levels for Spent Filter Aids
------------------------------------------------------------------------
                                                           Concentration
                       Constituents                         levels (mg/
                                                               kg)**
------------------------------------------------------------------------
Aniline
Benzaldehyde
Chloroaniline, p-
Cresol, p-
Dimethylaniline, N,N-
Dimethoxybenzidine, 3,3'-
Diphenylamine
Diphenylhydrazine, 1,2-
Formaldehyde
Naphthalene
Phenol
Phenylenediamine, p-
Toluidine, o-
Toluidine, p-
(**)
(**)
------------------------------------------------------------------------
** Relevant data are not included at the present time due to business
  confidentiality concerns.


            Table IV-2.--Concentration Levels for TAM Sludges
------------------------------------------------------------------------
                                                           Concentration
                       Constituent                          levels (mg/
                                                                kg)
------------------------------------------------------------------------
Benzaldehyde.............................................          5000
Dimethylamine, N,N-......................................           300
Diphenylamine............................................        27,000
Formaldehyde.............................................          7000
Toluidine, o-............................................            13
Toluidine, p-............................................            23
(**)                                                              (** )
------------------------------------------------------------------------
**Relevant data are not included at the present time due to business
  confidentiality concerns.

    As required under Sec. 261.30(b), we are adding those constituents 
that are the bases for listings to Appendix VII of Part 261, ``Basis 
for Listing Hazardous Waste.'' Thus, we are proposing to add the 
constituents in Table IV-1 for K167 (filter aids), and the constituents 
in Table IV-2 for K168 (TAM sludges) to Appendix VII. In addition, 
several constituents in Tables IV-1 and IV-2 are not currently listed 
on Appendix VIII to Part 261, ``Hazardous Constituents.'' EPA places 
constituents on Appendix VIII if they have been shown in scientific 
studies to have toxic, carcinogenic, mutagenic, or teratogenic effects 
on humans or other life forms (see 261.11(a)(3)). The Risk Assessment 
Background Document contains the detailed toxicological data for all 
constituents we evaluated, including the specific chemicals that we are 
proposing to add to Appendix VIII in today's rule: benzaldehyde, N,N-
dimethylaniline, p-cresol, and p-phenylenediamine, and another 
chemical, the identity of which is not given due to business 
confidentiality concerns. While cresol and phenylenediamine are 
currently listed on Appendix VIII, the precise isomers are not 
specified. Therefore, we are proposing to add these specific isomers. 
If, in response to comment, we decide to add any additional 
constituents to the chemicals of concern in either concentration-based 
listing, then we would also add those constituents to Appendix VII, and 
to Appendix VIII, if necessary.
    In proposing to promulgate a concentration-based listing for filter 
aids and TAM sludges under 40 CFR 261.11(a)(3), we considered the 
factors given under 40 CFR 261.11(a)(3) and believe that these wastes 
pose a substantial present or potential hazard to human health or the 
environment at the proposed listing levels. We considered nearly all of 
these factors as part of the risk assessment described in today's rule. 
Specifically, we considered the constituents' toxicity/concentration, 
mobility, persistence, and bioaccumulation potential in setting the 
concentration-based levels (corresponding to factors (I) through (vi) 
given in Sec. 261.11(a)(3)). As described in the risk assessment 
section, we considered municipal landfills as the ``plausible'' 
management practice (factor (vii)), and evaluated the waste quantities 
generated by facilities (factor viii). Concerning factor (ix), we 
examined damage cases for the dye and pigment industries for the 1994 
proposed rule (see Risk Assessment Support for Dye and Pigment Listing 
Determination, November 29 1994; document number S0333, EPA Docket No. 
F-94-DPLP-FFFFF). However none of those cases provide any information 
on the possible damages associated with the two wastes at issue in 
today's proposal. Finally, we considered other regulatory programs 
(factor (x)), when appropriate. No other regulatory program EPA 
identified adequately addressed the risks posed by the wastes. However, 
as noted in Section IV.C, we considered the protection afforded by the 
Clean Water Act, and the regulations being considered for leachate from 
landfills. As a result of this consideration, we are proposing to 
temporarily defer any regulation of landfill leachate that may be 
derived from the wastes proposed for listing, provided certain 
conditions are met.

B. What Are We Proposing for Anthraquinone Sludges?

    We are proposing not to list wastewater treatment sludges from the 
production of anthraquinone dyes and pigments. As described earlier in 
this notice, the only constituents that were

[[Page 40209]]

found in wastes that could be attributed to anthraquinone production ( 
the identities are not given due to business confidentiality concerns) 
do not have health-based benchmarks. We did not receive any data in 
comments on the 1994 proposed rule that would allow us to estimate such 
benchmarks.
    Discussion of the details of waste generation and management for 
this waste cannot be released at this time due to business 
confidentiality concerns.
    Therefore, we are proposing not to list anthraquinone sludges 
because we cannot identify any health threat from these wastes. Further 
discussion on the generation of this waste cannot be released at this 
time due to CBI constraints. We do not find any demonstrated risk from 
the constituents that we can attribute to anthraquinone production. We 
seek comment on this decision not to list this waste.

C. What Is the Status of Landfill Leachate From Previously Disposed 
Wastes?

    Leachate derived from the treatment, storage, or disposal of listed 
hazardous wastes is classified as a hazardous waste by virtue of the 
``derived-from'' rule in 40 CFR 261.3(c)(2). The Agency has been clear 
in the past that hazardous waste listings apply to wastes disposed of 
prior to the effective date of a listing, even if the landfill ceases 
disposal of the waste when the waste becomes hazardous (see 53 FR 
31147; August 17, 1988). We also have a well-established interpretation 
that listings likewise apply to leachate derived from the disposal of 
listed hazardous wastes, including leachate derived from wastes 
disposed before a listing effective date which meet the listing 
description. We are not reopening any of these issues by the present 
notice.
    Of course, as set out in detail in the August 1988 notice, this 
does not mean that landfills holding wastes which are subsequently 
listed as hazardous become subject to Subtitle C regulation. However, 
previously disposed wastes now meeting a listing description, including 
residues such as leachate which are derived from such wastes, which are 
``actively managed'' do become subject to Subtitle C regulation (id.). 
In many, indeed most circumstances, active management of leachate would 
be exempt from Subtitle C regulation because the usual management 
practice is discharge either to POTWs via the sewer system, where 
leachate mixes with domestic sewage and is excluded from RCRA 
jurisdiction (see RCRA Section 1004(27) and 40 CFR 261.4(a)(1)), or to 
navigable waters, also excluded from RCRA jurisdiction (see RCRA 
Section 1004(27) and 40 CFR 261.4(a)(2)). In addition, management of 
leachate in wastewater treatment tanks prior to discharge under the CWA 
is also exempt from RCRA regulation (40 CFR 264.1(g)(6)).
    However, we believe, because the proposed listings for the two 
categories of dye and pigment wastes (K167-K168) are concentration-
based listings, it would be difficult to know whether the previously 
disposed wastes that meet the narrative description of K167-K168 are in 
fact K167-K168 hazardous wastes that exceed the listing levels. We 
don't anticipate that records documenting the concentrations of 
proposed constituents of concern for these wastes exist for previously 
disposed wastes. Therefore, absent a finding that the wastes, when 
disposed, would have met the listing being proposed today, the 
previously disposed wastes (including landfill leachate and gas 
condensate derived from these wastes that are actively managed) could 
not be classified as K167-K168.
    However, if actively managed landfill leachate and gas condensate 
derived from the two categories of dye and pigment wastes proposed to 
be listed in today's rule could be classified as K167-K168, we are 
concerned about the potential disruption in current leachate management 
that could occur and the possibility for redundant regulation. 
Recently, this issue was raised to the Agency in the context of the 
petroleum refinery waste listings (see 63 FR 42173; August 6, 1998). A 
commenter expressed concern that, because some of their nonhazardous 
waste landfills received petroleum wastes which are now listed, the 
leachate that is collected and managed from these landfills would be 
classified as hazardous. The commenter argued that this could lead to 
increased treatment and disposal costs without necessarily any 
environmental benefit. After examining and seeking comment on this 
issue, we published a final rule that temporarily defers regulation of 
landfill leachate and gas condensate derived from certain listed 
petroleum refining wastes (K169-K172) that were disposed before, but 
not after, the new listings became effective, provided certain 
conditions are met (see 64 FR 6806; February 11, 1999).
    At the time this issue was brought to the Agency's attention in the 
context of the petroleum refinery waste listings, EPA's Office of Water 
had recently proposed national effluent limitations guidelines and 
pretreatment standards for wastewater discharges--most notably, 
leachate--from certain types of landfills (see 63 FR 6426; February 6, 
1998). In support of this proposal, EPA conducted a study of the volume 
and chemical composition of wastewaters generated by both Subtitle C 
(hazardous waste) and Subtitle D (nonhazardous waste) landfills, 
including treatment technologies and management practices currently in 
use. EPA proposed effluent limitations (for nine pollutants in the 
Nonhazardous Subcategory) for direct dischargers (see 63 FR 6463). Most 
pertinent to finalizing the temporary deferral for the petroleum 
refining wastes, EPA did not propose pretreatment standards for 
Subtitle D landfill wastewaters sent to POTWs because the Agency's 
information indicated that such standards were not required.
    The conditions included in the temporary deferral published on 
February 11, 1999 are that the leachate is subject to regulation under 
the Clean Water Act, and the leachate is not stored in surface 
impoundments after February 13, 2001. See 40 CFR 261.4(b)(15). We 
believed that it was appropriate to temporarily defer the application 
of the new waste codes to such leachate in order to avoid disruption of 
ongoing leachate management activities while the Agency decides how to 
integrate the RCRA and CWA regulations consistent with RCRA section 
1006(b)(1). As discussed above, we do not anticipate that this 
situation is likely to occur because the nature of the concentration-
based listing makes it difficult to determine whether the wastes 
previously disposed met the concentrations at the time of disposal. 
However, to the extent previously disposed of dye and pigment wastes 
could be determined to meet the listing description and levels, we 
believe that the same rationale fully discussed in the February 11, 
1999 rulemaking applies in this situation as well. As such, we would be 
concerned about forcing pretreatment of leachate even though 
pretreatment is neither required by the CWA nor needed. Therefore, we 
are proposing to temporarily defer landfill leachate and gas condensate 
derived from the two categories of dye and pigment wastes, with the 
same conditions as described in 40 CFR 261.4(b)(15) for petroleum 
wastes. We believe the issue of whether disruptions can be minimized 
through integration of CWA and RCRA rules will be more amenable to 
resolution once the CWA rulemaking is completed.
    We request any available information on whether or not the two 
categories of dye and pigment wastes previously disposed in 
nonhazardous landfills contained constituents of concern identified for 
these wastes at

[[Page 40210]]

concentrations equal to or greater than the proposed listing levels. 
Even if we don't receive any information that previously disposed dye 
and pigment wastes will result in generation of hazardous landfill 
leachate and gas condensate, we nonetheless intend to finalize the 
temporary deferral for landfill leachate and gas condensate from these 
wastes. This is because someone may discover this problem later (after 
the effective date of the listing), so, by having a temporary deferral 
in place, it would be possible to avoid disruption of ongoing leachate 
management activities while we further examine this issue and await the 
CWA final rule.

V. Generator Requirements for Implementation of Concentration-Based 
Listings

    We are proposing that the concentration-based listings be self-
implementing. This requires that you (the waste generator) meet the 
necessary conditions to determine whether or not your waste is 
hazardous based on the procedures we describe below. We have identified 
the constituents of concern for the two categories of dye and pigment 
wastes in Tables IV-1 and IV-2. We have also identified the listing 
level for each of these constituents in the same tables. We are 
proposing that you use this information, in conjunction with waste 
analysis results, to determine if your waste is a listed hazardous 
waste.
    Unless you make a determination that your waste is nonhazardous 
using the specified procedures, you are subject to the existing 
requirements under RCRA for persons who generate hazardous waste. Thus, 
if you are not already a hazardous waste generator, you must notify the 
EPA, according to section 3010 of RCRA, that you generate a hazardous 
waste. You are also subject to all applicable requirements for 
hazardous waste generators in 40 CFR 262.
    If you determine that your waste is nonhazardous, we are proposing 
to require, under the authority of sections 2002 and 3007 of RCRA, that 
you keep certain records of your waste and submit a notification and 
certification to the EPA claiming you have a nonhazardous waste. 
Following a nonhazardous claim, you would have a continuing obligation 
to ensure that your waste meets all of the proposed conditions and 
requirements for the waste to be deemed nonhazardous.

A. Do I Have to Determine Whether or Not My Waste Is Hazardous?

    If you want to assume that your waste is hazardous as-generated or 
you don't want to analyze it to make a hazardous waste determination, 
you may do that. In such a case, we are proposing your waste would be 
considered hazardous as-generated and subject to all applicable RCRA 
Subtitle C hazardous waste requirements, effective as of the effective 
date of the final rule or initial generation of the waste. However, if 
you want your waste to be nonhazardous as-generated, you must perform 
the waste analysis steps in V.C and determine your waste to be 
nonhazardous. If your waste is determined to be nonhazardous and 
claimed to be nonhazardous within 60 days (see V.D) following the 
effective date of the final rule or initial generation of the waste, we 
are proposing that none of the waste generated following the effective 
date of the rule or initial generation is hazardous as-generated.
    If you elect not to make this determination by the 60th day, or 
alternatively determine that your waste is hazardous, you may use the 
same waste analysis procedures (see V.C) to make a nonhazardous 
determination for your waste at anytime after the 60th day. If this 
determination shows your waste as-generated is nonhazardous, it can be 
claimed to be nonhazardous (see V.D). We are proposing that the 
nonhazardous claim for waste as-generated, if submitted more than 60 
days after the effective date of the rule or initial generation, would 
only become effective on the date when you receive a written receipt or 
confirmation that your notification and certification has been 
delivered to the EPA. After you have received this receipt or 
confirmation, any waste generated on or after the generation date of 
the waste that was analyzed for the nonhazardous determination may be 
claimed a nonhazardous waste that is not subject to Subtitle C, 
including LDR requirements. Any waste generated prior to that 
generation date remains hazardous.
    We request comment on whether the 60 day time limit for making a 
hazardous or nonhazardous waste listing determination and nonhazardous 
waste claim should be longer (e.g., 90 days) to allow adequate time for 
sampling and analyses.

B. How Do I Manage My Waste During the Period Between the Effective 
Date of the Final Rule and Initial Hazardous Waste Determination for My 
Waste?

    You cannot dispose of your waste as nonhazardous until you complete 
an initial determination to show that your waste is nonhazardous. 
Because the potential hazard from your waste is due to its placement on 
land, we are proposing that, as a condition of the waste being 
nonhazardous, you must store your waste in containers, or in another 
manner that does not involve land placement.
    Because the interim storage period for the waste prior to a 
hazardous waste determination is relatively short (60 days), we request 
comment on whether it is necessary to impose such a condition. Given 
that the generator would be subject to enforcement for improper storage 
if the waste turns out to be hazardous, generators may have adequate 
incentives to store the waste in compliance with Subtitle C 
requirements during the interim period.
    Alternatively, we could condition the waste being nonhazardous on 
the generator's storing the waste in accordance with the requirements 
described in 40 CFR 262.34. This would be an appropriate precaution in 
case the waste turns out to be hazardous. We also request comment on 
this approach.

C. What Are the Steps I Must Follow To Determine Whether or Not My 
Waste Is Hazardous?

    We are proposing the following waste analysis steps for making a 
determination that your waste is nonhazardous as-generated:
    1. You must collect a minimum of four representative samples of 
your waste and analyze each for the constituents of concern identified 
in Tables IV-1 or IV-2. These samples must be adequate to determine the 
maximum levels of constituents that may be in your waste. Instead of 
analyzing for a constituent, you may also apply process knowledge 
(knowledge of the constituents in your waste based on the materials, 
degradation products, and manufacturing processes used) to document 
that a constituent could not be present in the waste. You should note, 
however, that process knowledge cannot be used to determine a level of 
constituent in your waste.
    2. Compare the sampling and analyses results or process knowledge 
information (documentation that a constituent could not be present in 
the waste) for the constituents of concern in your waste to the 
hazardous

[[Page 40211]]

concentration levels set for these constituents.
    3. If none of your waste samples contain any of the constituents of 
concern at concentrations equal to or greater than the hazardous 
concentration levels set for these constituents, you can determine that 
your waste is nonhazardous. However, if any of your waste samples 
contains any of the constituents of concern at a concentration equal to 
or greater than the hazardous concentration level set for that 
constituent, your waste is a listed hazardous waste and subject to all 
applicable RCRA Subtitle C hazardous waste requirements.
    We would consider requiring less than four representative samples 
of the waste for the initial hazardous waste determination if this 
could be supported. We request comment on whether generators can 
reliably determine the maximum concentration of constituents in the 
waste with less than four samples. We also request comment on whether 
the generators should be allowed to use process knowledge information, 
in lieu of testing, to support claims that constituents of concern 
could not be present in their wastes. Alternatively, we could require 
testing for all constituents of concern in the initial testing.
    We are proposing that the maximum concentration of any constituent 
detected in any sample must be below the established listing level in 
order for you to determine that the waste is nonhazardous. We are 
proposing this approach because we believe it is the most protective, 
and because it does not rely on any statistical manipulation of waste 
analysis data to determine constituent concentrations in the waste. 
However, we request comment on whether the generator should be allowed 
to average constituent levels in multiple waste samples. Under that 
approach, the generator would calculate concentrations using an upper 
confidence limit on the mean (e.g., 95th percent) and compare this 
limit to the listing levels established for the constituents.

D. What Are the Requirements for a Waste Determined To Be Nonhazardous, 
and How Do I Claim My Waste To Be Nonhazardous?

    We are proposing that after you have determined your waste is 
nonhazardous, but prior to disposing the waste as nonhazardous, you 
must claim your waste to be nonhazardous as follows:
    1. You must submit a one-time notification to the EPA. The 
notification must include the facility name, address, and telephone 
number of an authorized representative, description of the waste and 
potential waste code, and an estimate of the average annual volume of 
waste claimed to be nonhazardous. The notification must also include a 
certification that none of your waste samples contain any of the 
constituents of concern identified for your waste at concentrations 
equal to or greater than the hazardous concentration levels set for 
these constituents, and these levels were determined without dilution 
of the waste. By dilution, we mean addition of other waste or media to 
your waste after generation, which do not meet the narrative listing 
description for your waste, in order to reduce the concentration of the 
constituents of concern in your waste to below listing levels.
    2. The notification and certification must be sent by certified 
mail return receipt, or by written confirmation of delivery from a 
commercial delivery service.
    3. The certification must be signed by a responsible corporate 
official and must state as follows: ``I certify under penalty of law 
that none of the waste samples contain any of the constituents of 
concern identified for this waste at concentrations equal to or greater 
than the hazardous concentration levels set for these constituents, and 
that these levels were determined without dilution of the waste. Based 
on information and belief formed after reasonable inquiry, the 
statements and information in the document are true, accurate, and 
complete. I am aware that there are significant penalties for 
submitting a false certification, including the possibility of fine and 
imprisonment.''
    We are proposing to require the notification and certification 
under the authority of Sections 2002 and 3007 of RCRA. The notification 
and certification will provide confirmation that certain wastes that 
meet the narrative description for the two categories of dye and 
pigment wastes are not RCRA hazardous wastes. We are not proposing to 
require submission of waste analysis data to the EPA for review or 
approval. Instead, we propose to require, also under the authority of 
sections 2002 and 3007 of RCRA, that certain records be kept on-site 
(see below). We request comment on whether generators should be 
required to submit waste analyses data along with the notification.

E. What Records am I Required To Keep On-Site To Support a Nonhazardous 
Claim for My Waste?

    We are proposing that you must, at a minimum, keep the following 
information on-site:
    1. A copy of the notification and certification sent to the EPA and 
documentation that it was received.
    2. The sampling and analysis plan used for collecting and analyzing 
representative samples of your waste.
    3. The initial sampling and analyses data and process knowledge 
information (if used) that support a nonhazardous claim for your waste.
    4. All follow-up sampling and analyses data and process knowledge 
information (if used) for the most recent three years.

F. What Happens if I Do Not Meet the Notification and Recordkeeping 
Requirements for a Waste That I Have Determined To Be Nonhazardous?

    We are requiring notification and recordkeeping under the authority 
of sections 2002 and 3007 of RCRA. These provisions are requirements, 
not conditions of the waste being nonhazardous. Failure to comply with 
these requirements may result in an enforcement action under Section 
3008 of RCRA. This section of the statute permits the imposition of 
civil penalties in an amount up to $27,500 for each day of 
noncompliance.

G. What Are the Follow-Up Waste Analysis Requirements for My 
Nonhazardous Waste?

    You must analyze a minimum of one representative sample of the 
nonhazardous waste every calendar year it is generated. You must also 
analyze a minimum of one representative sample of the nonhazardous 
waste anytime, after the initial waste analysis, there is a process 
change that may increase the concentrations of hazardous constituents 
of concern in the waste. If process change has not occurred, you may 
use the results of the initial waste analysis to create a more tailored 
list of the constituents of concern in your waste and test just for 
those constituents. If your waste is in fact hazardous (i.e., if it 
contains any constituent of concern at or above the regulatory level), 
you are liable for compliance with Subtitle C requirements.
    We request comment on whether a minimum of four representative 
samples should be required for follow-up waste analysis and whether 
follow-up waste analysis required every calendar year should be 
terminated after three consecutive years of verification that the waste 
remains nonhazardous. This would be based on the waste generator 
performing the required follow-up analysis on the waste and finding 
that none of the waste samples contain any of the constituents of 
concern at

[[Page 40212]]

concentrations at or above the hazardous concentration levels set for 
these constituents for three consecutive years.

H. What Happens if My Waste Constituent Concentration Are No Longer 
Below the Listing Concentrations?

    If follow-up waste analysis (or any analysis of your waste after 
the initial waste analysis) finds your waste contains one or more 
constituents of concern at concentrations at or above their hazardous 
concentrations, your waste is a listed hazardous waste and subject to 
all applicable RCRA Subtitle C hazardous waste requirements. To claim 
the waste nonhazardous again, you must repeat the initial waste 
analysis and show that none of the waste samples contain any of the 
constituents of concern at or above their hazardous concentrations. You 
must also submit a new notification and certification for your waste.

I. Can I Treat My Waste to Below Listing Concentrations and Then Claim 
My Waste To Be Nonhazardous?

    If your waste is hazardous as-generated, you can treat the waste to 
make it nonhazardous. However, if your waste is hazardous as-generated, 
it is subject to all applicable RCRA Subtitle C hazardous waste 
requirements and would be required to be treated in any case to meet 
the proposed LDR treatment standards before any placement in a land-
based unit. Under the proposed LDR treatment standards (see Section 
VI), the wastes must be treated using specified technologies 
(``technology standards''). We believe that compliance with LDR 
treatment standards is likely to result in nonhazardous concentrations 
of constituents in the waste. However, based on the mixture and 
derived-from rules, the treated waste would still carry the hazardous 
waste code. Therefore, you may choose to use the initial waste 
determination procedures for waste as-generated (see V.C above) to 
determine if your treated waste is nonhazardous. If your treated waste 
is determined to be nonhazardous and you want to claim it as 
nonhazardous, you must follow the same procedures as those required to 
claim ``as-generated'' waste nonhazardous (see V.D above). We are 
proposing that the non-hazardous claims for treated waste would only 
become effective on the date when you receive a written receipt or 
confirmation that your notification and certification has been 
delivered to the EPA. Thus, prior to the effective date, your waste 
still remains a listed hazardous waste and must meet all applicable 
RCRA Subtitle C hazardous waste requirements.

J. Alternative Implementation Approach

    As an alternative to the implementation approach proposed in 
today's rule, we may adopt a more streamlined approach for waste 
generators to use in self-implementing the concentration-based listings 
for these wastes. Under a streamlined approach, we would not require 
the waste generator to perform sampling and analysis procedures as 
conditions to determine that its waste (which meets the narrative 
description of K167 or K168) is nonhazardous. We would also not have 
notification and recordkeeping requirements for a waste determined to 
be nonhazardous. However, the levels for the constituents of concern in 
the waste would have to be below the listing levels, if the waste 
generated after the effective date of the rule is to be handled as 
nonhazardous waste. Therefore, after the effective date of the rule, if 
the waste is in fact hazardous (i.e., if it contains any constituent of 
concern at or above the regulatory level), the waste would be subject 
to Subtitle C requirements. We may also adopt an approach somewhere in 
the middle that includes some minimal waste characterization 
requirements.
    The streamlined implementation approach discussed above for the 
concentration-based listings would be similar to the existing program 
for determining whether a waste exhibits a hazardous characteristic. At 
this time, EPA believes the approach presented earlier in today's 
proposal (see V. A-I) is the more appropriate approach for this listing 
since, in contrast to the situation with characteristic wastes, we have 
performed analyses specific to this industry and have determined that 
the constituents of concern are likely to be present in the industry's 
waste. However, we will give careful consideration to any arguments 
presented or relevant waste analysis data submitted in response to 
today's proposal (e.g., data showing that only a small portion of the 
wastestreams in the industry exceed the listing levels) in order to 
decide whether a more streamlined approach is warranted. We request 
comment on possibly allowing the waste generators to use a more 
streamlined approach for self-implementing the concentration-based 
listings proposed in today's rule.

VI. Proposed Treatment Standards Under RCRA's Land Disposal 
Restrictions

A. What Are EPA's Land Disposal Restrictions (LDRs)?

    The statute requires EPA to establish treatment standards for all 
hazardous wastes that are land disposed. These are the so called ``land 
disposal restrictions'' or LDRs. For any hazardous waste identified or 
listed after November 8, 1984, EPA must promulgate these LDR treatment 
standards within six months of the date of identification or final 
listing (RCRA Section 3004(g)(4), 42 U.S.C. 6924(g)(4)). The statute 
also requires EPA to set as these treatment standards ``* * * levels or 
methods of treatment, if any, which substantially diminish the toxicity 
of the waste or substantially reduce the likelihood of migration of 
hazardous constituents from the waste so that short-term and long-term 
threats to human health and the environment are minimized.'' (RCRA 
Section 3004(m)(1), 42 U.S.C. 6924(m)(1)).
    Wastes that meet treatment standards established by EPA may be land 
disposed. Wastes that do not meet these standards are prohibited from 
land disposal (except in units meeting a stringent no-migration test). 
Each waste proposed for listing as hazardous in this rule will be 
subject to all the land disposal restrictions on the same day their 
respective listing becomes effective.

B. How Does EPA Develop LDR Treatment Standards?

    To establish LDR treatment standards, EPA first identifies the best 
demonstrated available technology (BDAT) for the hazardous constituents 
present in the hazardous waste, and then determines what constituent 
concentrations can be achieved by the technology or technologies 
identified as BDAT.
    EPA typically has established treatment standards based on 
performance data from the treatment of the waste at issue, if such data 
are available, and also from the treatment of wastes with similar 
chemical and physical characteristics or similar concentrations of 
hazardous constituents. Treatment standards typically cover both 
wastewater and nonwastewater waste forms on a constituent-specific 
basis. The constituents selected for regulation under the LDR program 
are not necessarily limited to those present in a proposed listing , 
but also may include those constituents or parameters that will ensure 
that treatment technologies

[[Page 40213]]

are operated properly. For listed waste EPA identifies these as 
``regulated constituents'' and they appear individually in the Table at 
40 CFR 268.40, along with their respective treatment standards.
    EPA may either designate a method of treatment as the treatment 
standard or develop a numerical treatment standard, which could be 
satisfied by use of any treatment technology (that doesn't entail 
impermissible dilution). On the other hand, if the treatment standard 
is a designated method, that is the only permissible means of treating 
the waste.
    After developing the LDR treatment standards, we must also 
determine if treatment capacity is available to treat the expected 
volumes of wastes. If so, the LDR treatment standards become effective 
essentially at the same time a listing does. If not, EPA may grant up 
to a two-year national capacity variance (NCV) during which time the 
LDR treatment standards are not effective.
    For a more detailed overview of the Agency's approach for 
developing treatment standards for hazardous wastes, see the final rule 
on solvents and dioxins (51 FR 40572, November 7, 1986) and section 
III.A.1 of the preamble to the final rule that set land disposal 
restrictions for the ``Third Third'' wastes (55 FR 22535, June 1, 
1990). EPA also has explained its BDAT procedures in ``Best 
Demonstrated Available Technology (BDAT) Background Document for 
Quality Assurance/Quality Control Procedures and Methodology (EPA/OSW, 
October 23, 1991)''. This document is available in the docket 
supporting this proposed rulemaking.

C. What Treatment Standards Are Proposed?

    The Agency has previously promulgated technology-specific 
standards--i.e., in the words of the statute, ``methods of 
treatment''--for the following K167 core constituents of concern: 3,3'-
dimethoxybenzidine (U091), 1,2-diphenylhydrazine (U099), formaldehyde 
(U121), o-toluidine (U328), p-toluidine (U353), and other chemical(s), 
the identities of which are not included due to business 
confidentiality concerns. We also promulgated technology-specific 
standards for K168 core constituents of concern: formaldehyde, o-
toluidine, and p-toluidine. Analytical complications formed the basis 
of the Agency's decision to promulgate technology-based BDAT treatment 
standards (see 55 FR 22611, June 1, 1990).
    These pre-existing technology-specific standards provide the 
starting point for our analysis. We also assessed the potential of 
developing numerical standards for these and the other constituents of 
concern in K167 and K168. We found that numerical treatment standards 
based on performance of BDAT (combustion) would nonetheless potentially 
result in situations where threats to human health and the environment 
are not minimized, as required by section 3004(m). This seeming anomaly 
is explained by the fact that numerical treatment standards based on 
performance of combustion consist of an analytical detection limit 
times a variability factor. In this instance, this numerical value 
would be significantly above the risk-based model levels of concern 
which justify the listing, largely due to high analytical detection 
limits for some constituents. Thus, the numerical treatment standards 
calculated in the accepted manner would arguably not meet the 
``minimize threat'' language governing LDR treatment standards in RCRA 
section 3004(m).1 As a result, we are not inclined to pursue 
the use of numerical treatment standards for K167 and K168.
---------------------------------------------------------------------------

    \1\ This is not to say that the listing levels necessarily 
represent ``minimize threat'' levels for these constituents. EPA is 
pursuing these questions in the HWIR rulemaking. Our point here is 
that the levels justifying the listing certainly are not lower than 
whatever levels EPA may eventually determine minimize threat levels 
to be, and that a numerical standard developed using our standard 
methodology would be higher still (essentially due to high detection 
limits).
---------------------------------------------------------------------------

    In looking further at technology-specific standards, we find that 
there is significant structural similarity among all the constituents 
of concern, including those for which we have not previously set 
technology-specific standards. The constituents of concern either have 
been demonstrated to be treated effectively by the BDAT technology to 
below detection, or are of structural similarity that it can be 
inferred that they would not be more difficult to treat via combustion 
or other destructive procedures. Hence, we expect that all constituents 
of concern for these two wastes are amenable to similar methods of 
treatment. Therefore, we find the previously promulgated technology-
specific standards to be the BDAT for the K167 and K168.
    We propose that the technology of combustion (CMBST) be specified 
for nonwastewater waste forms. For wastewater waste forms, we propose 
to specify that one of two alternatives be used: either a treatment 
train consisting wet air oxidation (WETOX) or chemical oxidation 
(CHOXD) followed by carbon adsorption (CARBN), or treatment by 
combustion (CMBST). We are confident that these technologies in units 
subject to either Subtitle C rules, or eventually, MACT standards for 
hazardous waste combustors, both of which require combustion units to 
meet specific standards to assure proper combustion at all times, will 
substantially diminish the toxicity of the K167 and K168 wastes so that 
short-term and long-term threats to human health and the environment 
are minimized. We repeat that, because we are proposing to express the 
treatment standards as specified technologies, wastes must be treated 
by the required technologies before disposal.2
---------------------------------------------------------------------------

    \2\ There are two exceptions. Where the treatment technology is 
not appropriate to the waste, regulations provide a petition process 
whereby the generator or treatment facility may petition the 
Administrator for a variance (see 40 CFR 268.44). In addition, 
persons may petition the Administrator for an alternate treatment 
method by showing that the alternate method can achieve a measure of 
performance equal to the method specified by rule (see 40 CFR 
268.42(b)).
---------------------------------------------------------------------------

D. Other LDR-Related Provisions

    The provisions in 40 CFR 268.45 would also be applicable for the 
treatment and disposal of hazardous debris cross-contaminated with K167 
or K168. Debris contaminated with K167 and/or K168 would be required to 
be treated prior to land disposal, using specific technologies from one 
or more of the following families of debris treatment technologies: 
extraction, destruction, or immobilization. Hazardous debris 
contaminated with a listed waste that is treated by an immobilization 
technology specified in 40 CFR 268.45 Table 1 is a hazardous waste and 
must be managed in a hazardous waste facility. Residuals generated from 
the treatment of debris contaminated with K167 or K168 would remain 
subject to the treatment standards proposed today. Residuals that no 
longer exceed the hazardous listing levels may be disposed in 
nonhazardous waste units. See 57 FR 37277, August 18, 1992, for 
additional information on the applicability, scope, and content of the 
hazardous debris provisions.
    Lastly, because land disposal also includes placement in injection 
wells (40 CFR 268.2(c)) application of the land disposal restrictions 
to K167 and K168 requires the modification of injection well 
requirements found in 40 CFR 148. We propose that K167 and K168 be 
prohibited from underground injection. Therefore, K167 and K168 wastes 
may not be underground injected unless they have been treated in 
compliance with the LDR treatment standards or a no migration petition 
for these wells has been approved.

[[Page 40214]]

E. Is There Treatment and Management Capacity Available for These 
Proposed Newly Identified Wastes?

1. What Is a Capacity Determination?
    When EPA develops new hazardous waste LDR regulations, the law 
(RCRA) requires us to determine whether adequate alternative treatment 
capacity exists nationally to manage the waste and meet the new 
treatment standards. The LDRs are effective when promulgated unless EPA 
grants a national capacity variance from the otherwise-applicable date 
and establishes a different date (not to exceed two years beyond the 
statutory deadline) based on ``* * * the earliest date on which 
adequate alternative treatment, recovery, or disposal capacity which 
protects human health and the environment will be available'' (RCRA 
section 3004(h)(2), 42 U.S.C. 6924(h)(2)).
    Our capacity analysis methodology focuses on the amount of waste 
currently disposed on the land, which will require alternative or 
additional treatment as a result of the LDRs. The quantities of wastes 
that are not disposed on the land, such as discharges regulated under 
NPDES, discharges to a POTW, or treatment in a RCRA exempt tank, are 
not included in the quantities requiring additional treatment as a 
result of the LDRs. Also, land disposed wastes that do not require 
alternative or additional treatment are excluded from the required 
capacity estimates (i.e., those that are currently treated to meet 
standards). Land disposed wastes requiring alternative or additional 
treatment or recovery capacity that is available on-site or within the 
same company also are excluded from the required commercial capacity 
estimates. The resulting estimates of required commercial capacity are 
then compared to estimates of available commercial capacity. If 
adequate commercial capacity exists, the waste is restricted from 
further land disposal. If adequate capacity does not exist, EPA has the 
authority to grant a national capacity variance.
    In making the estimates described above, the volume of waste 
requiring treatment depends on the current waste management practices 
employed by the waste generators before this proposed regulation is 
finalized and becomes effective. Data on waste management practices for 
these wastes were collected during the development of this proposed 
rule. However, we realize that as the regulatory process proceeds, 
generators of these wastes may decide to minimize or recycle their 
wastes or otherwise alter their management practices. Thus, EPA will 
monitor changes and update data on current management practices as 
these changes will affect the volume of wastes ultimately requiring 
commercial treatment or recovery capacity.
    The commercial hazardous waste treatment industry can change 
rapidly. For example, national commercial treatment capacity changes as 
new facilities come on-line or old facilities go off-line and as new 
units and new technologies are added at existing facilities. The 
available capacity at commercial facilities also changes as facilities 
change their commercial status (e.g., changing from a fully commercial 
to a limited commercial or ``captive''--company owned--facility). Thus, 
EPA also continues to update and monitor changes in available 
commercial treatment capacity.
    We request data on the annual generation volumes and 
characteristics of wastes affected by this proposed rule, including 
K167 and K168 in wastewater and nonwastewater forms, soil or debris 
contaminated with these wastes, residuals generated from the treatment 
or recycling of these wastes, and the current and planned management 
practices for the wastes, waste mixtures, and treatment residuals. We 
also request data on the current treatment or recovery capacity capable 
of treating these wastes, facility and unit permit status related to 
treatment of the proposed wastes and any plans that facilities may have 
to expand or reduce existing capacity, or construct new capacity. Of 
particular interest to us are waste characteristics, such as pH, total 
organic carbon content, constituent concentrations, and physical forms 
that may limit the availability of treatment technologies.
2. What Are the Capacity Analysis Results?
    This preamble only provides a brief summary of the capacity 
analysis performed to support this proposed regulation. For additional 
and more detailed information, please refer to the ``Background 
Document for Capacity Analysis for Land Disposal Restrictions: Newly 
Identified Dye and Pigment Process Wastes (Proposed Rule), June 1999.''
    For this capacity analysis, we examined data on waste 
characteristics and management practices gathered for the purpose of 
the dyes and pigments hazardous waste listing determination. The source 
for these data is primarily the 1992 RCRA Section 3007 survey and the 
follow-up survey specific to these wastes conducted in 1997 (see the 
docket for more information on these survey instruments--Background 
Document for proposed hazardous waste listing of Dyes and Pigments 
Wastes). The available data sources indicate that there are no 
quantities of either the K167 or K168 wastewater that will require 
alternative commercial treatment, and therefore this volume is assumed 
to be zero. There is adequate wastewater treatment capacity available 
should the need for treatment of the wastewater form of these wastes 
arise. EPA estimates of the quantity of nonwastewater forms of K167 and 
K168 that may require alternative commercial treatment and be managed 
off-site at a commercial hazardous waste treatment facility are not 
included due to business confidentiality concerns. Also, the ultimate 
volume of waste estimated to require alternative or additional 
commercial treatment may change if the final listing determination 
changes; should this occur, we will revise the capacity analysis 
accordingly. The actual quantity of waste requiring commercial 
treatment may be smaller due to facility closures after 1992 (the year 
of RCRA Section 3007 survey) and changes in product formulations. We 
recognize the batch process nature of this industry and the speed at 
which facilities may change product formulations.
    As described in the BDAT section above, EPA is proposing that the 
treatment standards be mandated treatment methods. The proposed 
treatment standard for nonwastewaters is combustion. We estimate that 
the commercially available sludge and solid combustion capacity is at 
least 300,000 tons per year and therefore sufficient to treat the 
lesser volume of these wastes which would newly require treatment. 
Therefore, we are proposing to not grant a national capacity variance 
from LDR treatment standards for these wastes.
    For soil and debris contaminated with these wastes, we believe that 
the vast majority of contaminated soil and debris will be managed on-
site and therefore would not require substantial commercial treatment 
capacity. Therefore, we are proposing to not grant a national capacity 
variance for hazardous soil and debris contaminated with the newly 
listed wastes covered under this proposal. Based on the questionnaire 
responses, there are no data showing mixed radioactive wastes or 
underground injected wastes associated with the proposed listings. We 
are also proposing to not grant a national capacity variance for mixed 
radioactive wastes (i.e., radioactive wastes mixed with K167 or K168) 
or wastes being underground injected.

[[Page 40215]]

    We solicit any updated or additional information pertinent to this 
determination. We also request comments on current and future 
management practices and the volumes managed for these wastes.

VII. State Authority and Compliance

A. How Are States Authorized Under RCRA?

    Under section 3006 of RCRA, EPA may authorize qualified States to 
administer and enforce the RCRA hazardous waste program within the 
State. (See 40 CFR Part 271 for the standards and requirements for 
authorization.) Following authorization, EPA retains enforcement 
authority under Sections 3007, 3008, 3013, and 7003 of RCRA, although 
authorized States have primary enforcement responsibility.
    Before the Hazardous and Solid Waste Amendments of 1984 (HSWA) 
amended RCRA, a State with final authorization administered its 
hazardous waste program entirely in lieu of the Federal program in that 
State. The Federal requirements no longer applied in the authorized 
State, and EPA could not issue permits for any facilities located in 
the State with permitting authorization. When new, more stringent 
Federal requirements were promulgated or enacted, the State was 
obligated to enact equivalent authority within specified time-frames. 
New Federal requirements did not take effect in an authorized State 
until the State adopted the requirements as State law.
    By contrast, under Section 3006(g) of RCRA, 42 U.S.C. 6926(g), new 
requirements and prohibitions imposed by the HSWA (including the 
hazardous waste listings finalized in this notice) take effect in 
authorized States at the same time that they take effect in non-
authorized States. While States must still adopt HSWA-related 
provisions as State law to retain final authorization, EPA is directed 
to implement those requirements and prohibitions in authorized States, 
including the issuance of permits, until the State is granted 
authorization to do so.
    Authorized States are required to modify their programs only when 
EPA promulgates Federal standards that are more stringent or broader in 
scope than existing Federal standards. Section 3009 of RCRA allows 
States to impose standards more stringent than those in the Federal 
program. See also 40 CFR 271.1(I). For those Federal program changes, 
both HSWA and non-HSWA, that are less stringent or reduce the scope of 
the Federal program, States are not required to modify their programs. 
Less stringent regulations, both HSWA and non-HSWA, do not go into 
effect in authorized States until those States adopt them and are 
authorized to implement them.

B. What Is the Effect of Today's Proposal on State Authorizations?

    We are proposing today's rule pursuant to HSWA authority. The 
listing of the new K-wastes is promulgated pursuant to RCRA Section 
3001(e)(2), a HSWA provision. Therefore, we are adding this rule to 
Table 1 in 40 CFR 271.1(j), which identifies the Federal program 
requirements that are promulgated pursuant to HSWA and take effect in 
all States, regardless of their authorization status. The land disposal 
restrictions for these wastes are promulgated pursuant to RCRA Section 
3004(g) and (m), also HSWA provisions. Table 2 in 40 CFR 271.1(j) is 
modified to indicate that these requirements are self-implementing. 
States may apply for either interim or final authorization for the HSWA 
provisions in 40 CFR 271.1(j), as discussed below. Until the States 
receive authorization for these more stringent HSWA provisions, EPA 
will implement them.
    A State submitting a program modification for the portions of this 
rule promulgated pursuant to HSWA authority may apply to receive either 
interim authorization under RCRA section 3006(g) or final authorization 
under 3006(b), if the State requirements are, respectively, 
substantially equivalent or equivalent to EPA's requirements. States 
can only receive final authorization for program modifications 
implementing non-HSWA requirements. The procedures and schedule for 
final authorization of State program modifications are described in 40 
CFR 271.21. It should be noted that all HSWA interim authorizations are 
currently scheduled to expire on January 1, 2003 (see 57 FR 60129, 
February 18, 1992).
    Section 271.21(e)(2) of EPA's State authorization regulations (40 
CFR Part 271) requires that States with final authorization modify 
their programs to reflect Federal program changes and submit the 
modifications to EPA for approval. The deadline by which the States 
must modify their programs to adopt this regulation is determined by 
the date of promulgation of a final rule in accordance with section 
271.21(e)(2). Table 1 at 40 CFR 271.1 is amended accordingly. Once EPA 
approves the modification, the State requirements become RCRA Subtitle 
C requirements.
    States with authorized RCRA programs already may have regulations 
similar to those in this proposed rule. These State regulations have 
not been assessed against the Federal regulations being finalized to 
determine whether they meet the tests for authorization. Thus, a State 
would not be authorized to implement these regulations as RCRA 
requirements until State program modifications are submitted to EPA and 
approved, pursuant to 40 CFR 271.21. Of course, States with existing 
regulations that are more stringent than or broader in scope than 
current Federal regulations may continue to administer and enforce 
their regulations as a matter of State law. In implementing the HSWA 
requirements, EPA will work with the States under agreements to avoid 
duplication of effort.

C. Who Must Notify EPA That They Have a Hazardous Waste?

    Under RCRA Section 3010, the Administrator may require all persons 
who handle hazardous wastes to notify EPA of their hazardous waste 
management activities within 90 days after the wastes are identified or 
listed as hazardous. This requirement may be applied even to those 
generators, transporters, and treatment, storage, and disposal 
facilities (TSDFs) that have previously notified EPA with respect to 
the management of other hazardous wastes. The Agency has decided to 
waive this notification requirement for persons who handle wastes that 
are covered by today's listings and have already (1) notified EPA that 
they manage other hazardous wastes, and (2) received an EPA 
identification number. However, any person who generates, transports, 
treats, stores, or disposes of these wastes and has not previously 
received an EPA identification number must obtain an identification 
number pursuant to 40 CFR 262.12 to generate, transport, treat, store, 
or dispose of these hazardous wastes 90 days after the effective date.

D. What Do Generators and Transporters Have To Do?

    Persons that generate newly identified hazardous wastes may be 
required to obtain an EPA identification number if they do not already 
have one (as discussed above). In order to be able to generate or 
transport these wastes after the effective date of this rule, 
generators of the wastes listed today will be subject to the generator 
requirements set forth in 40 CFR 262. These requirements include 
standards for hazardous waste determination (40 CFR 262.11), compliance 
with the manifest (40 CFR 262.20 to 262.23), pretransport procedures 
(40 CFR 262.30 to 262.34), generator accumulation (40 CFR

[[Page 40216]]

262.34), record keeping and reporting (40 CFR 262.40 to 262.44), and 
import/export procedures (40 CFR 262.50 to 262.60). The generator 
accumulation provisions of 40 CFR 262.34 allow generators to accumulate 
hazardous wastes without obtaining interim status or a permit only in 
units that are container storage units or tank systems; the regulations 
also place a limit on the maximum amount of time that wastes can be 
accumulated in these units. If these wastes are managed in units that 
are not tank systems or containers, these units are subject to the 
permitting requirements of 40 CFR 264 and 265, and the generator is 
required to obtain interim status and seek a permit (or modify interim 
status or a permit, as appropriate). Also, the regulations require that 
persons who transport newly identified hazardous wastes to obtain an 
EPA identification number as described above; such transporters will be 
subject to the transporter requirements set forth in 40 CFR Part 263.

E. Which Facilities Are Subject to Permitting?

1. Facilities Newly Subject to RCRA Permit Requirements
    Facilities that treat, store, or dispose of wastes that are subject 
to RCRA regulation for the first time by this proposed rule (that is, 
facilities that have not previously received a permit pursuant to 
Section 3005 of RCRA and are not currently operating pursuant to 
interim status), might be eligible for interim status (see Section 
3005(e)(1)(A)(ii) of RCRA). In order to obtain interim status based on 
treatment, storage, or disposal of such newly identified wastes, 
eligible facilities are required to comply with 40 CFR 270.70(a) and 
270.10(e) by providing notice under Section 3010 and submitting a Part 
A permit application no later than 6 months after date of publication 
of the final rule. Such facilities are subject to regulation under 40 
CFR Part 265 until a permit is issued.
    In addition, under Section 3005(e)(3) and 40 CFR 270.73(d), not 
later than 6 months after date of publication of the final rule, land 
disposal facilities newly qualifying for interim status under section 
3005(e)(1)(A)(ii) also must submit a Part B permit application and 
certify that the facility is in compliance with all applicable 
groundwater monitoring and financial responsibility requirements. If 
the facility fails to submit these certifications and a permit 
application, interim status will terminate on that date.
2. Existing Interim Status Facilities
    Pursuant to 40 CFR 270.72(a)(1), all existing hazardous waste 
management facilities (as defined in 40 CFR 270.2) that treat, store, 
or dispose of the newly identified hazardous wastes and are currently 
operating pursuant to interim status under section 3005(e) of RCRA, 
must file an amended Part A permit application with EPA no later than 
the effective date of today's rule, (i.e., 6 months after date of 
publication of a final rule). By doing this, the facility may continue 
managing the newly listed wastes. If the facility fails to file an 
amended Part A application by that date, the facility will not receive 
interim status for management of the newly listed hazardous wastes and 
may not manage those wastes until the facility receives either a permit 
or a change in interim status allowing such activity (40 CFR 
270.10(g)).
3. Permitted Facilities
    Facilities that already have RCRA permits must request permit 
modifications if they want to continue managing newly listed wastes 
(see 40 CFR 270.42(g)). This provision States that a permittee may 
continue managing the newly listed wastes by following certain 
requirements, including submitting a Class 1 permit modification 
request by the date on which the waste or unit becomes subject to the 
new regulatory requirements (i.e., the effective date of a final rule), 
complying with the applicable standards of 40 CFR Parts 265 and 266 and 
submitting a Class 2 or 3 permit modification request within 180 days 
of the effective date.
    Generally, a Class 2 modification is appropriate if the newly 
listed wastes will be managed in existing permitted units or in newly 
regulated tank or container units and will not require additional or 
different management practices than those authorized in the permit. A 
Class 2 modification requires the facility owner to provide public 
notice of the modification request, a 60-day public comment period, and 
an informal meeting between the owner and the public within the 60-day 
period. The Class 2 process includes a ``default provision,'' which 
provides that if the Agency does not reach a decision within 120 days, 
the modification is automatically authorized for 180 days. If the 
Agency does not reach a decision by the end of that period, the 
modification is permanently authorized (see 40 CFR 270.42(b)).
    A Class 3 modification is generally appropriate if management of 
the newly listed wastes requires additional or different management 
practices than those authorized in the permit or if newly regulated 
land-based units are involved. The initial public notification and 
public meeting requirements are the same as for Class 2 modifications. 
However, after the end of the 60-day public comment period, the Agency 
will grant or deny the permit modification request according to the 
more extensive procedures of 40 CFR Part 124. There is no default 
provision for Class 3 modifications (see 40 CFR 270.42(c)).
    Under 40 CFR 270.42(g)(1)(v), for newly regulated land disposal 
units, permitted facilities must certify that the facility is in 
compliance with all applicable 40 CFR Part 265 groundwater monitoring 
and financial responsibility requirements no later than 6 months after 
the date of publication of a final rule. If the facility fails to 
submit these certifications, authority to manage the newly listed 
wastes under 40 CFR 270.42(g) will terminate on that date.
4. Units
    Units in which newly identified hazardous wastes are generated or 
managed will be subject to all applicable requirements of 40 CFR 264 
for permitted facilities or 40 CFR 265 for interim status facilities, 
unless the unit is excluded from such permitting by other provisions, 
such as the wastewater treatment tank exclusions (40 CFR 264.1(g)(6) 
and 265.1(c)(10)) and the product storage tank exclusion (40 CFR 
261.4(c)). Examples of units to which these exclusions could never 
apply include landfills, waste piles, incinerators, and any other 
miscellaneous units in which these wastes may be generated or managed.
5. Closure
    All units in which newly identified hazardous wastes are treated, 
stored, or disposed after the effective date of this regulation that 
are not excluded from the requirements of 40 CFR 264 and 265 are 
subject to both the general closure and post-closure requirements of 
Subpart G of 40 CFR 264 and 265 and the unit-specific closure 
requirements set forth in the applicable unit technical standards 
Subpart of 40 CFR 264 or 265 (e.g., Subpart N for landfill units). In 
addition, EPA promulgated a final rule that allows, under limited 
circumstances, regulated landfills or surface impoundments to cease 
managing hazardous waste, but to delay Subtitle C closure to allow the 
unit to continue to manage nonhazardous waste for a period of time 
prior to closure of the unit (see 54 FR 33376, August 14, 1989). Units 
for which closure is delayed continue to be subject to all

[[Page 40217]]

applicable 40 CFR 264 and 265 requirements. Dates and procedures for 
submittal of necessary demonstrations, permit applications, and revised 
applications are detailed in 40 CFR 264.113(c) through (e) and 
265.113(c) through (e).

VIII. CERCLA Designation and Reportable Quantities

A. What Is the Relationship Between RCRA and CERCLA?

    CERCLA defines hazardous substances to include RCRA hazardous 
wastes. When EPA adds a hazardous waste under RCRA, the Agency also 
adds the waste to its list of CERCLA hazardous substances. CERCLA also 
establishes a reportable quantity or RQ for each CERCLA hazardous 
substance as one pound and authorizes EPA to adjust the RQ based on an 
evaluation of its physical, chemical, and toxic properties. If you are 
the person in charge of a vessel or facility that releases a CERCLA 
hazardous substance in an amount that equals or exceeds its RQ, then 
you must report that release to the National Response Center and State 
and local authorities. EPA provides a list of the CERCLA hazardous 
substances along with their RQs in Table 302.4 at 40 CFR 302.

B. Is EPA Proposing To Add Dye and Pigment Production Wastes to CERCLA?

    Yes. Today, EPA is proposing to add the dye and pigment production 
wastes (K167 and K168) to the list of CERCLA hazardous substances. 
Specifically, EPA is proposing to add the K167 and K168 waste streams 
as EPA defines them at 40 CFR Part 261 to Table 302.4 at 40 CFR Part 
302.

C. Is EPA Proposing To Adjust the Statutory One Pound RQ for K167 and 
K168 Wastes?

    No. Today, EPA is proposing to retain the statutory RQ of one pound 
for both K167 and K168 wastes. Some of the information on which the 
Agency is basing its decision to list the waste has been claimed to be 
confidential business information (CBI) collected for the purposes of 
RCRA. The Agency would have to rely on some of this information to 
establish RQs for these wastes under CERCLA. EPA adjusts an RQ of a 
waste stream based on an evaluation of all of the listed constituents 
of that waste. Both K167 and K168 wastes may contain hazardous 
constituents that have been claimed to be CBI. At this point, the 
Agency has been enjoined from releasing any information claimed as CBI 
and collected pursuant to this rulemaking. Until the Agency solves 
pending questions regarding the use of information collected pursuant 
to RCRA and claimed as CBI for this listing and for the CERCLA RQ 
determination, EPA is deferring making adjustments to the statutory RQs 
of these wastes.

D. When Do I Need To Report a Release of K167 and K168 Wastes Under 
CERCLA?

    If EPA promulgates today's proposed rule, you will need to report a 
release of either K167 or K168 waste if you are the person in charge of 
a vessel or facility that releases either waste and the amount that is 
released equals or exceeds one pound.

E. How Do I Report a Release?

    To report a release of any CERCLA hazardous substance (including 
K167 and K168, if EPA promulgates this rule) that equals or exceeds its 
RQ, you must immediately notify the National Response Center (NRC) as 
soon as you have knowledge of that release. The toll-free telephone 
number of the NRC is 1-800-424-8802; in the Washington, DC, 
metropolitan area, the number is (202) 267-2675.
    You also are required to report the release to State and local 
authorities (see 40 CFR 355). The Emergency Planning and Community 
Right-to-Know Act (EPCRA) requires that owners and operators of certain 
facilities report releases of CERCLA hazardous substances and EPCRA 
extremely hazardous substances to State and local authorities. After 
the release of an RQ or more of any CERCLA hazardous substance, you 
must immediately report the release to the community emergency 
coordinator of the local emergency planning committee for any area 
likely to be affected by the release, and to the State emergency 
response commission of any State likely to be affected by the release.

F. What Is the Statutory Authority for This Program?

    Section 101(14) of CERCLA defines the term hazardous substance by 
referring to substances listed under several other environmental 
statutes, as well as those substances that EPA designates as hazardous 
under CERCLA section 102(a). In particular, CERCLA section 101(14)(C) 
defines the term hazardous substance to include ``any hazardous waste 
having the characteristics identified under or listed pursuant to 
section 3001 of the Solid Waste Disposal Act.'' CERCLA section 102(a) 
gives EPA authority to determine RQs for CERCLA hazardous substances. 
CERCLA section 102(b) establishes a one pound RQ for all hazardous 
substances unless and until EPA adjusts the RQ under section 102(a). 
CERCLA section 103(a) requires any person in charge of a vessel or 
facility that releases a CERCLA hazardous substance in an amount equal 
to or greater than its RQ to report the release immediately to the 
federal government. EPCRA section 304 requires owners or operators of 
certain facilities to report releases of CERCLA hazardous substances 
and EPCRA extremely hazardous substances to State and local 
authorities.
    We invite comments today's proposal to designate the K167 and K168 
wastes under CERCLA and how it may affect you.

IX. Analytical and Regulatory Requirements

A. Is This a Significant Regulatory Action? (Executive Order 12866)

    Under Executive Order 12866, EPA must determine whether a 
regulatory action is significant and, therefore, subject to OMB review 
and the other provisions of the Executive Order. A significant 
regulatory action is defined by Executive Order 12866 as one 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 rights and obligations or 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 
Executive Order 12866.
    Under the terms of Executive Order 12866, we have determined that 
this rule is a ``significant regulatory action'' because of point four 
(4) above: the rule raises novel legal or policy issues arising out of 
legal mandates, the President's priorities, or the principles set forth 
in this Executive Order. Today's proposed concentration-based listing 
action deviates from the Agency's standard or historic listing 
approach. Historically, the Agency's listing program has captured 
entire quantities of targeted wastestreams posing unacceptable risks to 
human health and the environment. Today's approach identifies targeted 
wastestreams but proposes listing only those quantities containing one 
or more constituents of

[[Page 40218]]

concern at concentration levels that reflect unacceptable risks. This 
action, therefore, was submitted to OMB for review. Changes made in 
response to OMB suggestions or recommendations are documented in the 
public record.
    Although this rule is not ``economically significant,'' the Agency 
has prepared an economic support document for today's rule entitled: 
Economic Assessment for the Proposed Listing of Wastewater Treatment 
Sludge from the Production of Triarylmethane (TAM) Dyes and Pigments, 
and Spent Filter Aids from Azo, Anthraquinone, or Triarylmethane Dyes, 
Pigments, and Colorants. This Economic Assessment addresses, among 
other factors, compliance costs to the regulated community, industry 
economic impacts, qualitative benefits, small entity impacts, 
children's health, and environmental justice. A summary of findings 
from this Economic Assessment is presented below. The complete Economic 
Assessment document is available in the RCRA docket for today's rule.
    Today's proposed action is projected to result in incremental 
annual compliance costs to the organic dyes and pigments industries, 
however at this time we cannot include the range of aggregate costs due 
to business confidentiality concerns. Estimated impacts on potentially 
affected land disposal facilities are highly variable, depending upon 
the regulatory option. Due to business confidentiality concerns, we are 
currently not able to include annual aggregate nationwide compliance 
costs to land disposal facilities.

B. Why is This Proposed Rule Necessary?

    While waste produced by dye and pigment facilities already is 
regulated to a certain extent, certain waste streams generated by these 
facilities still pose both human health and ecological risks. Current 
disposal practices for both spent filter aids and TAM wastewater 
treatment sludge have the potential to pollute soil and water. To date, 
the market and other private sector institutions have failed to address 
pollution issues associated with these two wastestreams for several 
reasons.
    First, because individuals not responsible for the pollution bear 
the costs in human health and ecological damages, insufficient 
incentives exist for dye and pigment facilities to incur the additional 
costs for implementing pollution control measures. In this case, the 
private industry costs of production do not fully reflect the human 
health and environmental costs of management of these two wastestreams. 
This situation, referred to as ``environmental externality,'' 
represents a type of market failure. A non-regulatory approach, such as 
educational outreach programs, would be largely ineffective because the 
people who are made aware of the potential health risks (e.g., those 
people living near landfills where these two wastestreams are disposed) 
have limited ability to reduce exposure without incurring significant 
costs.
    Second, the parties harmed by the pollution of soil and water are 
not likely to obtain compensation from dye and pigment facilities 
through legal or other means. This is due to the high transaction costs 
involved, and the difficulty citizens may have in establishing a causal 
relationship between the damage incurred and activity at the dye or 
pigment facility. Establishing a direct link between a specific dye or 
pigment facility and human health and/or other damages incurred would 
be especially difficult since under current practices many facilities 
dispose of wastes in landfills where it is co-mingled with many other 
wastes.
    We believe that federal government intervention is necessary to 
correct for these market distortions and to fairly and consistently 
internalize costs associated with these negative externalities. We feel 
that federal regulation is the optimal means of correcting these market 
failures. EPA, therefore, is proposing a concentration based hazardous 
waste listing for spent filter aids and TAM wastewater treatment 
sludge.

C. What Regulatory Options Were Considered?

    We considered three regulatory options for management of the two 
waste streams examined in this assessment. These were: no listing-
status quo, the standard listing approach (covering the entire quantity 
of all affected wastestreams), and a concentration-based listing 
approach. The no-list option would result in affected facilities not 
incurring any incremental management and administrative costs under 
RCRA Subtitle C. This option, however, may result in affected 
facilities facing future human health and environmental liabilities for 
groundwater damages. The standard listing (includes all affected 
wastes) option would require that all affected facilities comply with 
RCRA Subtitle C regulations. These facilities would incur incremental 
management and administrative costs required under RCRA Subtitle C. The 
concentration-based listing approach requires that affected facilities 
determine whether or not their waste contains constituent 
concentrations that exceed regulatory limits. If concentrations exceed 
regulatory limits, the waste is regulated under RCRA Subtitle C and the 
facility will incur incremental management, administrative, and 
analytical costs. Because of the wide variation in the types of 
constituents and concentrations present in these two waste streams, the 
Agency is proposing a concentration-based listing approach in today's 
action.

D. What are the Potential Cost Impacts of Today's Proposed Rule?

1. Introduction and Scope of Analysis
    The value of any regulatory policy is traditionally measured by the 
net change in social welfare that it generates. The Economic Assessment 
conducted in support of today's proposed action examines both costs and 
benefits in an effort to anticipate the overall change in social 
welfare. The primary focus of the analysis is on compliance costs and 
economic impacts potentially borne by the dyes and pigments industries. 
Benefits are examined on a qualitative basis. Other regulatory issues 
covered in the Economic Assessment include small entity impacts, 
environmental justice, children's health, and unfunded mandates. The 
Economic Assessment also examines potential impacts on land disposal 
facilities which have received wastes considered in this rulemaking.
2. Key Data Sources
    The primary source of information used to establish baseline 
conditions in the dyes and pigments industries was from RCRA 3007 
questionnaires. The RCRA 3007 data used in this analysis represent the 
total number of facilities believed to be generating TAM and spent 
filter aid waste. Other key data sources include: the 1992 Census of 
Manufacturers, the U.S. International Trade Commission, and various 
news sources which report on industry trends. Because our data were 
limited, the estimated findings from this analysis should be viewed as 
national, and not specific to any discernible facility.
3. Industry Profile and Market Overview
    Today's proposed action is expected to affect three different 
industries; the organic dyes industry, the organic pigments industry, 
and the municipal and industrial solid waste landfill industry. The 
organic dyes and pigments industries produce dyes and pigments for a 
wide variety of intermediate and end users including the automotive, 
textile, printing, and

[[Page 40219]]

plastics industries. The municipal and industrial solid waste landfill 
industry receives and manages waste from industries generating 
nonhazardous or exempt materials. A hazardous determination for wastes 
previously accepted as nonhazardous may require modified management 
procedures for the leachate generated from municipal and industrial 
facilities that have previously accepted these wastes.

Organic Dyes and Pigments Industries--General

    Both the organic dyes industry and the organic pigments industry 
are classified under the North American Industry Classification System 
(NAICS) as 325132, Synthetic Organic Dye and Pigment Manufacturing. The 
Ecological and Toxicological Association of the Dyestuffs Manufacturing 
Industry (ETAD) defines dyes as ``intensely colored or fluorescent 
organic substances which impart color to a substrate by selective 
absorption of light.'' The Color Pigment Manufacturers' Association 
(CPMA) defines pigments as ``colored, black, white, or fluorescent 
particulate organic or inorganic solids, which usually are insoluble 
in, and essentially physically and chemically unaffected by, the 
vehicle or substrate in which they are incorporated.''
    More than 2,000 individual dyes are manufactured, generally in 
multiple small batch quantities. This large number of dyes is 
attributable to the many different types of materials to which dyes are 
applied and the different conditions of service for which dyes are 
required. There are fewer pigments produced than dyes, however, pigment 
batches are generally larger in size. Organic dyes are classified in 
several ways including their chemical structure or class, general dye 
chemistry, and application process. Chemical structure classifications 
include azos, triarylmethanes (TAM), diphenylmethanes, anthraquinones, 
stilbenes, methines, polymethines, xanthenes, phthalocyanines, and 
sulfurs. Organic pigments are derived in whole or in part from 
benzenoid chemicals and colors and are described as toners or lakes. 
These pigments essentially are the same in final form, but differ in 
their preparation method. This proposed waste listing is concerned with 
TAM wastewater treatment sludges and spent filter aid waste streams 
resulting from the production of azo, anthraquinone, or triarylmethane 
dyes, pigments, and colorants.
    In 1992, the most recent year for which consistent data are 
available, there were reportedly 38 establishments listed under 
Standard Industrial Classification (SIC) 28652, Synthetic Organic Dyes, 
and 42 establishments listed under SIC Code 28653, Synthetic Organic 
Pigments, Lakes, and Toners (Bureau of the Census, 1992 Census of 
Manufacturers). Total employment was estimated at 5,200 individuals for 
the synthetic organic dyes industry and 4,500 individuals for the 
synthetic organic pigments industry. Aggregate annual wages for both 
the dyes and pigments industries totaled approximately $375 million in 
1992.
    There are significant barriers to entry in both the dyes and 
pigments industries in terms of capital investment and environmental 
liability. Both dyes and pigments are produced by organic synthesis, 
which translates into capital-and time-intensive requirements, making a 
certain level of economy to scale a necessity. During the 1980s, many 
smaller dyes businesses either closed or were acquired by larger 
companies. The smaller dye producers that remain operating today 
typically supply niche markets not serviced by the large producers 
because of profitability, environmental concerns, or small volumes. 
During the 1980s, the colored pigments industry was dramatically 
restructured due to globalization of pigment markets, competitive 
factors, and the increasing cost of plant improvements to meet 
governmental standards, particularly in the United States. A number of 
smaller producers, unable to compete with larger international firms, 
closed their plants or were acquired by larger firms, primarily from 
Western Europe or Japan.
    Consolidation has continued in the dyes and pigments industries 
throughout the 1990s, and is expected to continue through the year 2000 
as the industries face increasing pressure from the growth of low-cost 
producers in Asia and other developing countries. The synthetic organic 
pigments industry currently consists of a few large multinational 
companies and a number of smaller pigment companies that specialize in 
a few product lines. Sales of organic pigments make up a relatively 
small portion of these multinational's overall chemical sales. The 
majority of the U.S. dye business is currently controlled by European-
owned companies operating in the United States.
    The U.S. International Trade Commission's (USITC) production data 
for the five-year period from 1990 through 1994 indicated that dye 
production was highest in 1993 at approximately 160,000 tons. 
Production declined in 1994 to approximately 156,000 tons. More recent 
production information is not available. The Chemical Market Reporter, 
December 22, 1997, indicates that the demand for organic dyes is likely 
to increase between 2.0 and 2.5 percent annually through the end of the 
decade. The average unit value of all dyes has varied from 
approximately $6,000 to $6,800 per ton during the 1990 through 1993 
period; data for 1994 are not available. The total production value of 
dyes in the mid 1990's was approximately $1.0 billion. The Industry and 
Trade Summary: Synthetic Organic Pigments, USITC Publication 3021, 
February 1997, indicates that total U.S. production of organic pigments 
grew from 56,400 tons in 1991 to an estimated 71,500 tons in 1995. The 
average unit value of all organic pigments has varied from about 
$14,800 to $16,100 per ton over the 1991 through 1995 period. The total 
production value of organic pigments is estimated at $1.2 billion for 
1997.
    The majority of organic dye imports to the U.S. in the mid 1990's 
came from Western Europe. Most of these imports represented intra 
company sales between European dye manufacturers and their U.S. 
subsidiaries. Asia accounted for the vast majority of remaining 
imports. Industry experts predict that this distribution will remain 
unchanged through the year 2,000. The pigments industry is a global 
industry with imports having a significant impact on the U.S. market. 
The major synthetic organic pigments suppliers to the United States 
have been Germany, Japan, Switzerland, and the United Kingdom. In 1995, 
these four countries accounted for 73 percent of the value of organic 
pigments imports. In recent years, imports of lower technical 
requirement pigments have increased, with the Republic of Korea and 
Japan being the major suppliers. In recent years, China and India have 
emerged as important suppliers to the U.S. synthetic organic pigment 
market. Analysts expect this trend to continue and indicate that 
increased Chinese imports place downward pressure on prices.
    The largest export markets for the U.S. dye industry in 1992, in 
terms of quantity, were Canada, Mexico, United Kingdom, the 
Netherlands, and Japan. U.S. exports to Western Europe were mostly 
intra company sales between European dye manufacturers and their U.S. 
subsidiaries. The primary export markets for U.S. synthetic organic 
pigments are Canada, Belgium, the United Kingdom, and Japan. During 
1991-95, total U.S. organic pigments exports increased 50 percent from 
$200

[[Page 40220]]

million in 1991, to $299 million in 1994, with a slight decline in 
1995. A large portion of U.S. exports to Europe were believed to be 
sales by large European-owned multinational companies with production 
facilities in the U.S. The strength of the U.S. dollar will have a 
significant impact on the ultimate strength of U.S. exports.

The Municipal and Industrial Solid Waste Landfill Industry

    A disposal practice for nonhazardous organic dye and pigment 
industry wastes is off-site disposal in industrial and/or municipal 
solid waste landfills. The leachate derived from these wastes has 
traditionally been collected and recirculated, treated, or disposed. 
Because of the proposed listing, collected leachate from landfills 
(i.e., cells) that have accepted these wastes may be hazardous under 
the Derived-from Rule. Also, when the leachate from these two wastes 
mixes with leachate from other wastes, the entire leachate quantity 
from the affected landfill (or cell) may be considered hazardous under 
the Mixture Rule. By changing the regulatory status of the proposed 
wastes, the collected leachate from the disposal of these wastes will 
be covered under Subtitle C of RCRA. Municipal Solid Waste (MSW) and 
industrial landfills that have previously accepted and generated 
leachate from these wastes may face increased leachate management 
costs.
    The EPA Report, Characterization of Municipal Solid Waste in the 
United States: 1997 Update, EPA530-R-98-007, May 1998, estimates there 
were approximately 2,400 MSW landfills in the contiguous U.S. for 1996. 
Based on the best available data, we have determined the number of MSW 
and industrial landfills that received the two organic dye and pigment 
industry wastes proposed for listing. This information, however, is not 
included due to business confidentiality concerns.
    It is highly probable that these landfills are located within 50 
miles of the organic dyes and pigments facilities. Leachate quantities 
generated by each of these landfills are dependent upon the geographic 
location, area, leachate collection system design, and operation of the 
landfill. Recent information from the Solid Waste Digest indicates that 
landfills receiving anywhere from 250 to 1,500 tons of waste per day 
are representative of landfills receiving dye and pigment wastes. Based 
on an average national tipping fee, the approximate annual sales for a 
landfill that, on average, accepts 750 tons of waste per day, would be 
about $7.7 million. Aggregate nationwide municipal landfill revenues 
are estimated in the range of $6.2 to $37.1 billion per year.
4. Baseline Waste Management Procedures and Costs
    This section briefly summarizes the baseline management procedures 
and costs the dyes and pigments industries are subject to in contending 
with the proposed wastes. Baseline leachate management procedures and 
costs experienced by landfills accepting the proposed dye and pigment 
wastes are also discussed.

Organic Dyes and Pigments--Proposed Wastestream Listings

    The two wastes generated during the production of dyes and pigments 
that we are proposing for listing as hazardous under RCRA are 
identified as K167 and K168. These are described below:
    K167--Spent filter aids, diatomaceous earth, or absorbents used in 
the production of azo, anthraquinone, or triarylmethane dyes or 
pigments.
    K168--Wastewater treatment sludge from the production of TAM dyes 
and pigments (excluding triarylmethane pigments using aniline as a 
feedstock).
    The annual generation of these proposed hazardous wastes are 
estimated and analyzed as combined quantities. Further discussion on 
management practices is not included due to business confidentiality 
concerns. This analysis applies baseline scenarios using both MSW lined 
and industrial D unlined landfill facilities.
    Costs for baseline waste management practices were derived from 
published sources and industry submitted data. The cost for waste 
disposal in a lined MSW landfill with leachate collection is estimated 
at $75 per ton. Disposal in an unlined landfill is estimated at $63 per 
ton. Waste disposal costs for Facilities currently managing under 
Subtitle C are estimated at $650 per ton for incineration and $213 per 
ton for disposal in a Subtitle C landfill. Waste discharge to a POTW is 
estimated to cost $1.50 per 1,000 gallons. The Subtitle C 
transportation cost is estimated at $53 per ton, within a 200-mile 
limit.

Dye and Pigment Leachate Management--Affected Landfills

    Our analysis indicates that a number of landfills are likely to be 
affected by the proposed dye and pigment listing. The number of 
affected landfills, however, is not included here due to business 
confidentiality concerns. Data on leachate management practices for 
these landfills are extrapolated from a petroleum sample leachate 
management distribution. Applying the distribution of management 
practices identified in the petroleum sample to the population of 
landfills affected by the two wastes indicates results that cannot be 
included due to business confidentiality concerns.
    The average leachate and condensate quantities generated per 
representative landfill over the 5-year expected generation scenario 
are as follows: 5.0 million gallons per year discharge via a NPDES-
permit, 4.2 million gallons per year to a POTW, 2.0 million gallons per 
year trucked to an off-site POTW, 1.6 million gallons per year for 
which a portion is trucked and the remainder (0.6 million gallons per 
year) is recirculated.
    Baseline leachate and condensate management cost data were provided 
by representative landfill facilities. These data were used to develop 
average unit cost estimates on a per year per landfill basis for each 
leachate management practice. Average leachate management costs are 
estimated as follows: truck to an off-site POTW ($0.07/gallon), truck a 
portion to an off-site POTW and recirculate the remaining fraction 
($0.05/gallon), discharge to an NPDES outfall ($0.04/gallon), discharge 
via pipe to POTW ($0.03/gallon), and recirculate ($0.01/gallon).
5. Compliance Waste Management Procedures and Costs
    We considered three regulatory options in analyzing compliant waste 
management procedures and costs for generators of the proposed waste 
listings: no listing-status quo, concentration-based listing, and 
standard listing. The no-list option results in no incremental 
compliance costs. The concentration-based listing requires sampling and 
analysis costs not normally required under a standard listing, but may 
result in reduced waste quantities managed as hazardous waste. The 
assessment conducted for today's action examines the economic impacts 
to the affected facilities under the proposed concentration-based 
listing and assumes 100 percent of all affected wastestreams must be 
managed as hazardous waste. This assumption results in a high-end, or 
worst case scenario for examining industry economic impacts.
    We also considered three regulatory options in the evaluation of 
compliant procedures and costs for leachate generated from landfills 
that have accepted the proposed dye and pigment wastestreams. These 
options are: no list, a Clean Water Act temporary deferral

[[Page 40221]]

option with a two-year impoundment deferral, and, a standard listing 
leachate management option that treats the leachate as hazardous waste 
subject to Subtitle C regulation. The no-list option would result in no 
incremental management and cost impacts to affected landfills. The 
Clean Water Act temporary deferral option would exempt the landfill 
leachate from being RCRA Subtitle C regulation if it is managed under 
the Clean Water Act. After two years, impoundments would no longer be 
allowed to manage exempt leachate. The standard listing option would 
require that landfills treat the leachate as hazardous waste and 
subject to Subtitle C regulation under the Derived-from and Mixture 
Rules. Existing exemptions would apply. We examined compliance 
management procedures and incremental cost to landfills under the Clean 
Water Act temporary deferral and standard listing options.

Organic Dyes and Pigments Industries--Proposed Wastestream Listings

    Future post listing compliance waste management practices assume 
the promulgation of land disposal restrictions (LDRs). The compliance 
management practice assumed is RCRA Subtitle C hazardous waste 
incineration, with disposal of the resulting ash in a Subtitle C 
landfill. Stabilization of the incinerator ash is not assumed given the 
lack of significant hazardous metal constituents in the wastes. Our 
assumptions for other management practices reported are not included 
due to business confidentiality concerns. Cost estimates for compliance 
management activities have been derived using unit costs from published 
sources and additional data obtained from Agency and contractor 
knowledge. Subtitle C incineration and ash disposal in a Subtitle C 
landfill is estimated at $650/ton and $213/ton, respectively. Shipping 
costs to Subtitle C facilities is based on a flat fee of $53/ton for a 
200-mile radius.
    Facilities generating the proposed waste listings are subject to 
Part 262 of RCRA. There are four primary requirements specified in the 
Part 262 standards: plants must obtain an EPA identification number, an 
approved manifest system must be established, pre transport 
requirements must be satisfied (labeling, marking, placarding), and, 
specified record keeping and reporting requirements are triggered. All 
of the facilities affected by this proposed listing are assumed to have 
already been affected by the previous proposed listing. Therefore, 
minimal incremental administrative costs are assumed to be incurred as 
a result of today's proposed listing. This analysis assumes that RCRA 
Parts 264 and 270 do not apply.
    Sampling and analysis costs in this assessment are based on the 
assumption that wastes produced at each facility will be sampled each 
year. Aggregate sampling and analysis costs are based on an average and 
worst case number of chemicals. Sampling and analysis costs include 
taking the sample, packaging, transportation, analysis of the sample, 
and reporting the results. Costs were estimated assuming analysis for 
total concentrations. The annualized sampling costs for constituents 
are estimated to be $153/sample, and the sampling costs for the worst-
case number of constituents are estimated to be $246/sample.
    Corrective action compliance costs associated with non-permitted 
facilities include the cost to conduct a RCRA Facility Investigation 
(RFI), a Corrective Measures Study (CMS), and remediate solid waste 
management units (SWMUs) and areas of concern (AOCs). Because of the 
previous listing, we assumed all facilities affected by this proposed 
rule will already have triggered quanitification of the above 
corrective action compliance costs. No incremental costs for corrective 
action compliance are assumed to be incurred as a result of this 
proposed listing.

Dye and Pigment Leachate Management--Affected Landfills

    Under the Standard Listing regulatory option, the leachate 
collected from landfill cells that received these two waste streams 
will be managed according to the requirements specified under Subtitle 
C of RCRA. Under the Clean Water Act temporary deferral regulatory 
option, the Agency will exempt the leachate from being regulated as 
hazardous under Subtitle C if it is managed in tank systems under the 
Clean Water Act (including POTWs) or through recirculation. Under a no 
list regulatory option, leachate quantities generated at MSW landfills 
will continue to be regulated under Subtitle D of RCRA and leachate 
quantities generated at industrial waste landfills will be subject to 
state and local regulations.
    Cost estimates for leachate compliance management and 
transportation activities were derived using unit costs from published 
sources, annualized costs (updated) developed in the previously 
proposed organic dye and pigment hazardous waste listings, and the 
recent final listing of four petroleum refining waste streams. Cost 
estimates have been developed on an annualized per landfill basis for 
capital and O&M requirements, based on a 5-year, 10-year, and 20-year 
period of amortization. These periods are designed to reflect the 
period under RCRA regulation and the remaining life of the landfill. 
The cost estimate ranges also cover the expected five-year leachate 
generation and ten-year conservative leachate generation case. Because 
there are fewer commercial treatment/POTW facilities permitted to 
receive manifested hazardous wastewaters (i.e., leachate), total 
transport distances are assumed to increase with the promulgation of 
the rule.
    We have developed compliance cost estimates for the following 
leachate management practices: truck to a POTW, truck to a POTW plus 
reticulate, reticulate only, hardpipe to a POTW, and discharge via 
NPDES. RCRA administrative costs are also estimated. Annualized 
compliance costs on a per landfill basis, presented in million dollars, 
are estimated as follows: truck to a POTW ($1.71-$7.00), truck to a 
POTW plus reticulate ($1.38-$5.64), reticulate only ($0.01-$0.02) , 
hardpipe to a POTW (same as baseline), and discharge via NPDES ($0.10-
$0.27). These costs encompass the full range of amortization over the 
five, ten, and twenty year period. RCRA administrative costs associated 
with compliance are estimated to be no more than $4,000 per landfill 
per year.
6. Incremental Aggregate Compliance Costs
    This section summarizes the projected incremental compliance costs 
associated with today's proposed action. Incremental costs are 
estimated for the generators of the proposed dye and pigment wastes, 
and the Subtitle D landfill facilities that accepted these wastes.
Organic Dyes and Pigments--Proposed Wastestream Listings
    Total baseline management and compliance management costs were 
calculated on a per unit basis for each activity. Incremental costs are 
the difference between baseline and compliance costs, including 
administrative, and sampling and analysis costs. The total incremental 
cost is the summation of this difference between baseline and 
compliance costs across all affected waste quantities/facilities. Our 
analysis indicates that total incremental costs associated with the 
proposed listing may fall within a broad range. We are not able to 
present these findings due to business confidentiality concerns. 
Presentation of the average incremental cost per ton is

[[Page 40222]]

also subject to business confidentiality restrictions. The high-end 
estimate assumes 100 percent baseline waste management in an unlined 
landfill, and analytical costs for the high-end estimate of 
constituents potentially impacted.
Dye and Pigment Leachate Management--Affected Landfills
    The total incremental landfill costs are estimated by multiplying 
the number of affected landfills in each leachate management category 
by incremental landfill costs, calculated on a unit-by-unit basis. The 
estimated impacts on the affected land disposal facilities are highly 
variable, depending on the regulatory option. Under the standard 
listing option, costs were found to fall within a broad range. Business 
confidentiality restrictions prevent us from releasing this 
information. The range reflects a five, ten, or twenty year 
amortization schedule, and the five or ten year leachate generation 
period. Presentation of cost impacts under the Clean Waste Act 
temporary deferral option is also restricted due to business 
confidentiality concerns.

E. What Are the Potential Economic Impacts to Industry From the 
Proposed Rule?

    We examined the economic impacts to both dye and pigment 
manufacturers and solid waste landfill facilities. The impacts to the 
dye and pigment industry were examined by comparing incremental costs 
to annual estimated sales for the affected product lines. Incremental 
compliance costs to landfills were examined as a percent of revenues 
from tipping fees.
Economic Impacts--Organic Dyes and Pigments Industry
    Waste generation rates for filter aids and TAM sludge are variable, 
depending upon the product being manufactured. A model facilities 
approach was used based on four representative waste generation rate 
categories. Information regarding waste generation rates, production 
rates, and product sales was derived from responses to RCRA 3007 
questionnaires and from U.S. International Trade Commission Reports. 
Like waste generation rates, product prices are also highly variable. 
Product prices used in this analysis ranged from $6,500 to $18,000 per 
ton. Data provided in U.S. International Trade Commission public 
reports served as a basis for approximating average industry prices.
    Gross sales, based on the above range of waste generation rates and 
prices, were estimated. These findings, however may not be divulged due 
to business confidentiality concerns. A midpoint of annual gross sales 
was also estimated for the waste generation categories examined. It 
should be noted that individual facilities are likely to produce a 
variety of products, not all of which will be affected by this proposed 
rulemaking. The gross sales estimates developed for this analysis only 
reflect sales of affected product lines and do not reflect aggregate 
sales for any single facility.
    Incremental compliance cost impacts were estimated but may not be 
released to the public due to business confidentiality concerns. The 
actual economic impact will likely be dependent on the price elasticity 
of demand for individual dye and pigment products. For example, if an 
affected product has many close substitutes, it is possible that the 
producer of the impacted product may not be able to modify prices in 
response to increased production costs. Conversely, dye and pigment 
products with unique applications may have a more inelastic demand. 
Prices of these products may be increased enough to largely offset any 
changes associated with the rulemaking. It is important to consider 
that this rulemaking affects less than a certain percent of the overall 
combined production of the dyes and pigments industries. While the 
estimated impacts may be experienced on selected product lines, overall 
impacts on the industries are expected to be less due to multiple 
product lines.
Economic Impacts--Solid Waste Landfills Managing Dye and Pigment 
Leachate
    We examined average incremental compliance costs as a percent of 
sales (tipping fee revenues) for three different sized landfills to 
estimate potential economic impacts of the proposed listing on landfill 
management costs. The model landfill facilities were assumed to accept 
250, 750, and 1,500 tons of waste per day. These sizes were selected as 
representative of the industry and landfills accepting dye and pigment 
wastes.
    Annual landfill sales were derived for each of the models using an 
average national tipping fee of $35.81/ton. It was assumed that the 
landfills operated approximately 286 days a year (five and one-half 
days/week). Therefore, approximate annual sales for a landfill that on 
average accepts 750 tons of waste per day would be $7.68 million. 
Impact estimates are based on average leachate generation rates.
    Incremental costs were examined for both the Standard Regulatory 
Option and the Clean Water Act temporary deferral. For each option, 
incremental costs were considered for six management practices. In 
estimating the potential economic impacts of the Standard Regulatory 
Option, expected incremental compliance costs based on a five-year 
amortization schedule were used. The five-year amortization is believed 
to correspond more closely to the actual leachate generation. 
Incremental compliance costs for the analysis of the Clean Water Act 
temporary deferral option are based on a 20-year capital amortization 
schedule.
    Under the standard listing option, we have estimated costs that 
facilities would face if they have to truck the leachate to a POTW. 
These impacts cannot be presented to the public due to business 
confidentiality concerns. Actual incremental compliance costs for the 
smallest landfill size were estimated but may not be divulged. Impacts 
in relation to all other technologies in the standard listing scenario 
were estimated but may not be divulged due to business confidentiality 
concerns. Under the Clean Water Act temporary deferral option, costs 
were also estimated. Business confidentiality concerns prevent us from 
releasing this information also.

F. What Are the Potential Benefits From the Proposed Rule?

    We conducted a qualitative benefits analysis of today's proposed 
listing of filter aids and TAM wastewater treatment sludges. This 
analysis addresses human health benefits projected as a result of the 
proposed listing. The analysis also examines benefits associated with 
waste minimization efforts potentially stimulated by this action. 
Potential ecological benefits are not examined. The analysis 
incorporates findings from, and is consistent with, the risk analysis 
conducted in support of this action. Incremental individual and/or 
population benefits are not available for incorporation into this 
benefits analysis.
    In determining whether waste generated from the production of dyes 
and pigments meets the criteria for listing a waste as hazardous as set 
out at 40 CFR 261.11, we initially evaluated the potential toxicity and 
intrinsic hazard of the constituents likely to be present in the waste 
streams. The fate and mobility of these chemicals, the likely exposure 
routes, the current waste management practices, and plausible 
management practices were examined. Based on this assessment we 
identified a core list of constituents associated

[[Page 40223]]

with filter aids TAM sludges. We are seeking comment on the inclusion 
of other constituents of potential concern (see Section IV).
Human Health Benefits
    One objective of a human health risk assessment is to estimate the 
number of chronic health impacts that could be avoided as a result of 
the implementation of the proposed rule. This would include the 
exposures by drinking contaminated water from residential wells located 
near the source of contamination, consuming food products contaminated 
by blowing dust or vapors, and otherwise being exposed directly to 
contaminated soil and water.
    The benefit associated with today's action is the enhanced security 
associated with more stringent management requirements for the proposed 
``high concentration'' filter aid and TAM wastestreams. When these 
wastestreams are managed under the more stringent Subtitle C 
requirements, the risks to human health and the environment associated 
with their disposal is minimized.
Waste Minimization Benefits
    Regulatory compliance costs for the dyes and pigments industries 
may be lowered through use of waste minimization practices. A 
previously issued guidance document on pollution prevention, recycling, 
and reuse practices for the dye manufacturing industry offers a number 
of general and specific alternatives. Engineering site visits, 
particularly at newer facilities, indicated that a number of these 
practices are economically and technically feasible. These visits also 
pointed out areas of improvement needed at all facilities, most notably 
reduction of wastewater volume.
    Specific waste minimization procedures and corresponding cost 
reductions tend to be highly dependent on the manufacturing processes 
at each facility. The following waste minimization opportunities for 
specific plant operations and waste streams may decrease compliance 
costs through reduction in waste volume at dye and pigment facilities: 
filtering devices with reusable membranes, centrifugation, dry 
collection of dust and fines whenever practicable, automated handling 
and measurement of raw materials and products, and consideration of 
process integration for recycling to other parts of the same facility.
    As noted earlier in today's notice, a concentration-based listing 
also provides an added incentive for generators to reduce the level of 
hazardous constituents of concern. If constituent levels are reduced to 
below the concentration levels specified in the listing regulation, 
then their waste will not be regulated as hazardous.

G. What Consideration Was Given to Small Entities?

    Pursuant to the Regulatory Flexibility Act (5 U.S.C. 601 et seq., 
as amended by the Small Business Regulatory Enforcement Fairness Act 
(SBREFA) of 1996) whenever an agency is required to publish a notice of 
rulemaking for any proposed or final rule, it must prepare and make 
available for public comment a regulatory flexibility analysis that 
describes the effect of the rule on small entities (i.e., small 
businesses, small organizations, and small governmental jurisdictions). 
However, no regulatory flexibility analysis is required if the head of 
an agency certifies the rule will not have a significant economic 
impact on a substantial number of small entities.
    We conducted a screening analysis to answer a series of questions 
regarding the potential impacts of the proposed dyes and pigments waste 
listing on small entities. This analysis was conducted per the 
requirements of the Regulatory Flexibility Act (RFA) as amended by the 
Small Business Regulatory Enforcement Fairness Act (SBREFA), and Agency 
guidance. Our screening analysis came to a definitive conclusion. 
However, we are not able to divulge this conclusion due to business 
confidentiality concerns.
    The Small Business Administration (SBA) size standard for small 
businesses in the dyes and pigments industry, which is part of cyclic 
crudes and intermediates (NAICS 325132) is 750 employees (13 CFR 
121.201). This, and all size standards apply to the owners or parent 
corporation, of the business, and not individual plant operations which 
are most directly affected by this proposed regulation. Of the dye and 
pigment companies potentially affected by the regulation, we have 
determined the maximum number of small businesses under the SBA size 
standard. This determination, however, is not available for public 
release due to business confidentiality concerns. It is possible that 
some of the landfills affected by this rulemaking may be small 
according to the SBA size standards for landfills (less than $5 million 
in sales).
    Data are not available on the financial status of the small 
entities in question, as they are privately held companies. However, we 
have made a preliminary estimate of the impact on these companies, 
assuming that 100 percent of all wastes are managed as Subtitle C. We 
may not release this finding due to business confidentiality concerns.
    It is important to recognize that these estimates are based only on 
product sales which are directly associated with the waste generated. 
For instance, an individual company may produce 100 different dyes, but 
spent filter aids may only be generated in the production of 20 of 
them. In this case, the impact estimate only represents the sales value 
of the 20 dyes associated with the generation of the spent filter aids, 
and not on overall company sales. Overall company impacts would be 
lower. For the landfills potentially affected by the rule, impacts have 
been estimated but are not available for release due to business 
confidentiality concerns.
    As a result of the screening analysis, the Agency has come to a 
conclusion concerning small business impacts but is not able to release 
this information due to business confidentiality concerns. This rule 
does not require a full regulatory flexibility analysis. The Economic 
Assessment document presents the complete regulatory flexibility 
screening analysis conducted in support of today's action.

H. What Consideration Was Given to Children's Health?

Children's Health (Executive Order 13045)
    ``Protection of Children from Environmental Health Risks and Safety 
Risks'' (62 FR 19885, April 23, 1997) applies to any rule that: (1) is 
determined to be ``economically significant'' as defined under E.O. 
12866, and (2) concerns an environmental health or safety risk that EPA 
has reason to believe may have a disproportionate effect on children. 
If the regulatory action meets both criteria, the Agency must evaluate 
the environmental health or safety effects of the planned rule on 
children, and explain why the planned regulation is preferable to other 
potentially effective and reasonably feasible alternatives considered 
by the Agency. This proposed rule is not subject to the Executive Order 
because it is not economically significant as defined in E.O. 12866, 
and because the Agency does not have reason to believe the 
environmental health or safety risks addressed by this action present a 
disproportionate risk to children.
    The topic of environmental threats to children's health is growing 
in regulatory importance as scientists, policy makers, and village 
leaders continue to recognize the extent to which children are 
particularly vulnerable to environmental hazards.

[[Page 40224]]

Recent EPA actions have been in the forefront of addressing 
environmental threats to the health and safety of children. Today's 
proposed rule further reflects our commitment to mitigating 
environmental threats to children.
    A few significant physiological characteristics are largely 
responsible for children's increased susceptibility to environmental 
hazards. First, children eat proportionately more food, drink 
proportionately more fluids, and breathe more air per pound of body 
weight than do adults. As a result, children potentially experience 
greater levels of exposure to environmental threats than do adults. 
Second, because children's bodies are still in the process of 
development, their immune systems, neurological systems, and other 
immature organs can be more easily and considerably affected by 
environmental hazards. The connection between these physical 
characteristics and children's susceptibility to environmental threats 
are reflected in the higher baseline risk levels for children.
    Today's proposed rule will reduce risks posed by the hazardous 
constituents found in the listed waste streams by requiring more 
appropriate and safer management practices. EPA considered risks to 
children in its risk assessment and set allowable concentrations for 
constituents in the waste at levels that are believed to be protective 
to children, as well as adults. The more appropriate and safer 
management practices proposed in this rule are projected to reduce 
risks to children potentially exposed to the constituents of concern.
    The public is invited to submit or identify peer-reviewed studies 
and data, of which the agency may not be aware, that assess results of 
early life exposure to the proposed hazardous constituents from filter 
aids and TAM waste generated in the production of organic dyes and 
pigments.

I. What Consideration Was Given to Environmental Justice?

Environmental Justice (Executive Order 12898)
    Executive Order 12898, ``Federal Actions to Address Environmental 
Justice in Minority Populations and Low-Income Population'' (February 
11, 1994), is designed to address the environmental and human health 
conditions of minority and low-income populations. EPA is committed to 
addressing environmental justice concerns and is assuming a leadership 
role in environmental justice initiatives to enhance environmental 
quality for all residents of the United States. The Agency's goals are 
to ensure that no segment of the population, regardless of race, color, 
national origin, or income bears disproportionately high and adverse 
human health and environmental impacts as a result of EPA's policies, 
programs, and activities, and that all people live in clean and 
sustainable communities. In response to Executive Order 12898 and to 
concerns voiced by many groups outside the Agency, EPA's Office of 
Solid Waste and Emergency Response (OSWER) formed an Environmental 
Justice Task Force to analyze the array of environmental justice issues 
specific to waste programs and to develop an overall strategy to 
identify and address these issues (OSWER Directive No. 9200.3-17).
    To comply with the Executive Order, we have assessed whether 
today's proposed rule may have disproportionate effects on minority 
populations or low-income populations. We do not have determinative 
facility location correlated with minority population and impacts data 
to indicate that the environmental problems addressed by the proposed 
listing for dye and pigment wastes could disproportionately effect 
minority or low income communities. The affected facilities, however, 
are distributed throughout the country and many are located within 
highly urbanized areas. Because the proposed rule reduces environmental 
risks associated with the management of the proposed waste streams, the 
Agency believes that this rule will not result in adverse human health 
and environmental impacts. Today's proposed rule, therefore, is not 
expected to result in any disproportionately negative impacts on 
minority or low income communities relative to affluent or non minority 
communities.

J. What Consideration Was Given to Unfunded Mandates?

Executive Order 12875
    Under Executive Order 12875, EPA may not issue a regulation that is 
not required by statute and that creates a mandate upon a State, local 
or tribal government, unless the Federal government provides the funds 
necessary to pay the direct compliance costs incurred by those 
governments, or EPA consults with those governments. If EPA complies by 
consulting, Executive Order 12875 requires EPA to provide to the Office 
of Management and Budget a description of the extent of EPA's prior 
consultation with representatives of affected State, local and tribal 
governments, the nature of their concerns, any written communications 
from the governments, and a statement supporting the need to issue the 
regulation. In addition, Executive Order 12875 requires EPA to develop 
an effective process permitting elected officials and other 
representatives of State, local and tribal governments ``to provide 
meaningful and timely input in the development of regulatory proposals 
containing significant unfunded mandates.''
    Today's rule implements mandates specifically and explicitly set 
forth by the Congress without the exercise of any policy discretion by 
EPA. This action is proposed under the authority of Sections 3001(e)(2) 
and 3001 (b)(1) of the Hazardous and Solid Waste Amendments (HSWA) of 
1984, which direct EPA to make a hazardous waste listing determination 
for certain wastes from the dye and pigment industries. Accordingly, 
the requirements of section 1(a) of Executive Order 12875 do not apply 
to this rule.
Unfunded Mandates Reform Act (UMRA)
    The Unfunded Mandates Reform Act (UMRA) of 1995 supersedes 
Executive Order 12875 and reiterates previously established directives, 
while imposing additional requirements. Title II of the UMRA, Public 
Law 104-4, establishes requirements for Federal agencies to assess the 
effects of their regulatory actions by State, local, and tribal 
governments and the private sector. Under section 202 of UMRA, EPA 
generally must prepare a written statement, including a cost-benefit 
analysis, for proposed rules and final rules for which the Agency 
published a notice of proposed rulemaking if those rules contain 
``Federal mandates'' that may result in the expenditure by State, 
local, and tribal governments , in the aggregate, or to the private 
sector, of $100 million or more in any single year. If a written 
statement is needed, section 205 of the UMRA generally requires EPA to 
identify and consider a reasonable number of regulatory alternatives. 
Under section 205, EPA must adopt the least costly, most cost-effective 
or least burdensome alternative that achieves the objectives of the 
rule, unless the Administrator publishes with the final rule an 
explanation why that alternative was not adopted. The provisions of 
section 205 do not apply when they are inconsistent with applicable 
law.
    We have determined that this proposed rule will not result in the 
expenditure of $100 million or more by State, local, and tribal 
governments, in

[[Page 40225]]

the aggregate, or by the private sector in any single year.

K. What Consideration Was Given to Tribal Governments Analysis?

Executive Order 13084
    Under Executive Order 13084, ``Consultation with Tribal 
Governments,'' the EPA may not issue a regulation that is not required 
by statute, that significantly or uniquely affects the communities of 
Indian tribal governments, or that imposes substantial direct 
compliance costs on those communities, unless the Federal government 
provides the funds necessary to pay the direct compliance costs 
incurred by the tribal governments. If EPA complies by consulting, the 
EPA must provide the Office of Management and Budget, in a separately 
identified section of the preamble to the rule, or proposed rule, a 
description of the extent of our prior consultation with 
representatives of affected tribal governments, a summary of their 
concerns, and a statement supporting the need to issue the regulation. 
Also, Executive Order 13084 requires the EPA to develop an effective 
process permitting elected and other representatives of Indian tribal 
governments to, ``provide meaningful and timely input in the 
development of regulatory policies on matters that significantly or 
uniquely affect their communities.''
    For many of the same reasons described above under unfunded 
mandates, the requirements of Executive Order 13084 do not apply to 
this proposed rulemaking. While Executive Order 13084 does not provide 
a specific gauge for determining whether a proposed regulation 
``significantly or uniquely affects'' an Indian tribal government, this 
proposal does not impose substantial direct compliance costs on tribal 
governments and/or their communities. Tribal communities are not known 
to own or operate any dye or pigment manufacturing facilities, nor are 
these communities disproportionately located adjacent to or near such 
facilities. Finally, tribal governments will not be required to assume 
any administrative or permitting responsibilities associated with this 
proposed rule.

L. Was the National Technology Transfer and Advancement Act Considered?

    Section 12(d) of the National Technology Transfer and Advancement 
Act of 1995 (``NTTAA''), Public Law 104-113, section 12(d) (15 U.S.C. 
272 note) directs EPA to use voluntary consensus standards in its 
regulatory activities unless to do so would be inconsistent with 
applicable law or otherwise impractical. Voluntary consensus standards 
are technical standards (e.g., materials specifications, test methods, 
sampling procedures, and business practices) that are developed or 
adopted by voluntary consensus standards bodies. The NTTAA directs EPA 
to provide Congress, through OMB, explanations when the Agency decides 
not to use available and applicable voluntary consensus standards.
    This proposed rulemaking does not involved technical standards. 
Therefore, EPA is not considering the use of any voluntary consensus 
standards.

M. How Is the Paperwork Reduction Act Considered in Today's Proposal?

    The information collection requirements in this proposed rule have 
been submitted for approval to the Office of Management and Budget 
(OMB) under the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. An 
Information Collection Request (ICR) document has been prepared by EPA 
(ICR No. 1918.01) and a copy may be obtained from Sandy Farmer by mail 
at Office of Policy (OP) Regulatory Information Division; U.S. 
Environmental Protection Agency (2137); 401 M Street, SW; Washington, 
DC 20460, by email at [email protected], or by calling (202) 
260-2740. A copy may also be downloaded off the Internet at http://
www.epa.gov/icr.
    This proposed rule contains concentration-based listings that 
generators would be self-implementing. Under the concentration-based 
listings, a generator of wastes that fall within the K167 or K168 
listing descriptions must comply with waste analysis requirements if it 
wants to determine that its waste is nonhazardous. These requirements 
are necessary to ensure that the levels of selected constituents in the 
wastes are below the regulatory levels of concern.
    The Agency estimated the worst-case burden associated with 
complying with the requirements in this proposed rule. In 1992, the 
most recent year for which consistent data are available, there were 
reportedly 80 dye and pigment facilities (Industrial Organic Chemicals, 
Manufacturers-Industry Series, Census Bureau, Department of Commerce, 
1992). Because of business confidentiality concerns in using the actual 
number of facilities that reported generating wastes that fall within 
the K167 or K168 listing descriptions, EPA assumed that all 80 
facilities generate these wastes. In addition, EPA assumed that all 80 
facilities would analyze their wastes and find the wastes to be 
hazardous. Under such assumptions, all of these 80 facilities, as well 
as subsequent handlers, would need to manage and dispose of the wastes 
under RCRA Subtitle C regulations.
    The estimated worst-case burden results from the following 
requirements for industry respondents: reading the regulations; 
performing waste analysis, and incremental burden associated with 
complying with existing RCRA regulations. To the extent that this rule 
imposes burden as incremental to the existing RCRA regulations 
promulgated in previous rulemakings, those requirements have been 
assigned OMB control numbers 2050-0024 (ICR No. 976.08, Hazardous Waste 
Report--Biennial Report); 2050-0039 (ICR No. 801.12, Requirements for 
Generators, Transporters, and Waste Management Facilities under the 
Hazardous Waste Manifest System); 2050-0120 (ICR No. 1571.05, General 
Hazardous Waste Facility Standards); 2050-0085 (ICR No. 1442.14, Land 
Disposal Restrictions); and 2050-0009 (ICR No. 1573.05, Part B Permit 
Application, Permit Modifications and Special Permits).
    EPA estimates that the total annual respondent burden for all 
activities will be 7,334 hours. The estimated total cost for all 
activities will be $508,605. If generators determine their wastes to be 
nonhazardous after performing waste analysis, the proposed rule 
contains some new notification and recordkeeping requirements. However, 
the information collection burden associated with these requirements 
would not be expected to be greater than if the generators determine 
their wastes to be hazardous.
    Burden means the total time, effort, or financial resources 
expended by persons to generate, maintain, retain, or disclose or 
provide information to or for a Federal agency. This includes the time 
needed to review instructions; develop, acquire, install, and use 
technology and systems for the purposes of collecting, validating, and 
verifying information, processing and maintaining information, and 
disclosing and providing information; adjust the existing ways to 
comply with any previously applicable instructions and requirements; 
train personnel to be able to respond to a collection of information; 
search data sources; complete and review the collection of information 
; and transmit or otherwise disclose the information.
    An agency may not conduct or sponsor, and a person is not required 
to respond to a collection of information unless it displays a 
currently valid OMB

[[Page 40226]]

control number. The OMB control numbers for EPA's regulations are 
listed in 40 CFR Part 9 and 48 CFR Chapter 15.
    Comments are requested on the Agency's need for this information, 
the accuracy of the provided burden estimates, and any suggested 
methods for minimizing respondent burden, including through the use of 
automated collection techniques. Send comments on the ICR to the 
Director, OP Regulatory Information Division; U.S. Environmental 
Protection Agency (2137); 401 M Street, SW; Washington, DC 20460; and 
to the Office of Information and Regulatory Affairs, Office of 
Management and Budget, 725 17th Street, NW; Washington, DC 20503, 
marked ``Attention: Desk Officer for EPA.'' Include the ICR number in 
any correspondence. Since OMB is required to make a decision concerning 
the ICR between 30 and 60 days after July 23, 1999, a comment to OMB is 
best assured of having its full effect if OMB receives it by August 23, 
1999. The final rule will respond to any OMB and public comments on the 
information collection requirements contained in this proposal.

List of Subjects

40 CFR Part 148

    Administrative practice and procedure, Hazardous wastes, Reporting 
and recordkeeping requirements, Water supply.

40 CFR Part 261

    Environmental protection, Hazardous waste, Recycling, Reporting and 
recordkeeping requirements.

40 CFR Part 268

    Environmental protection, Hazardous waste, Reporting and 
recordkeeping requirements.

40 CFR Part 271

    Environmental protection, Administrative practice and procedure, 
Confidential business information, Hazardous materials transportation, 
Hazardous waste, Indians-lands, Intergovernmental relations, Penalties, 
Reporting and recordkeeping requirements, Water pollution control, 
Water supply.

40 CFR Part 302

    Environmental protection, Air pollution control, Chemicals, 
Emergency Planning and Community Right-to-Know Act, Hazardous 
substances, Hazardous waste, Intergovernmental relations, Natural 
resources, Reporting and recordkeeping requirements, Superfund, Water 
pollution control, Water supply.

    Dated: June 30, 1999.
Carol M. Browner,
Administrator.

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

PART 148--HAZARDOUS WASTE INJECTION RESTRICTIONS

    1. The authority citation for part 148 continues to read as 
follows:

    Authority: Secs. 3004, Resource Conservation and Recovery Act, 
42 U.S.C. 6901 et seq.

    2. Section 148.18 is amended by adding paragraphs (j) and (k) to 
read as follows:


Sec. 148.18  Waste specific prohibitions--newly listed and identified 
wastes.

* * * * *
    (j) Effective [date six months after date of final rule], the 
wastes specified in Sec. 261.32 of this chapter as EPA Hazardous Waste 
Numbers K167 and K168 are prohibited from underground injection.
    (k) The requirements of paragraphs (a) through (j) of this section 
do not apply:
    (1) If the wastes meet or are treated to meet the applicable 
standards specified in Subpart D of part 268 of this chapter; or
    (2) If an exemption from a prohibition has been granted in response 
to a petition under Subpart C of this part; or
    (3) During the period of extension of the applicable effective 
date, if an extension has been granted under Sec. 148.4.

PART 261--IDENTIFICATION AND LISTING OF HAZARDOUS WASTE

    3. The authority citation for Part 261 continues to read as 
follows:

    Authority: 42 U.S.C. 6905, 6912(a), 6921, 6922, 6924(y), and 
6938.

    4. Section 261.4 is amended by revising paragraph (b)(15) to read 
as follows.


Sec. 261.4  Exclusions.

* * * * *
    (b) * * *
    (15) Leachate or gas condensate collected from landfills where 
certain solid wastes have been disposed, provided that:
    (i) The solid wastes disposed would meet one or more of the listing 
descriptions for Hazardous Waste Codes K167, K168, K169, K170, K171, 
and K172 if these wastes had been generated after the effective date of 
the listing;
    (ii) The solid wastes described in paragraph (b)(15)(i) of this 
section were disposed prior to the effective date of the listing;
    (iii) The leachate or gas condensate do not exhibit any 
characteristic of hazardous waste nor are derived from any other listed 
hazardous waste;
    (iv) Discharge of the leachate or gas condensate, including 
leachate or gas condensate transferred from the landfill to a POTW by 
truck, rail, or dedicated pipe, is subject to regulation under sections 
307(b) or 402 of the Clean Water Act;
    (v) After February 13, 2001, leachate or gas condensate derived 
from K169-K172 will no longer be exempt if it is stored or managed in a 
surface impoundment prior to discharge. After [date 24 months after 
publication date of the final rule], leachate or gas condensate derived 
from K167-K168 will no longer be exempt if it is stored or managed in a 
surface impoundment prior to discharge. There is one exception: if the 
surface impoundment is used to temporarily store leachate or gas 
condensate in response to an emergency situation (e.g., shutdown of 
wastewater treatment system), provided the impoundment has a double 
liner, and provided the leachate or gas condensate is removed from the 
impoundment and continues to be managed in compliance with the 
conditions of this paragraph (b)(15) after the emergency ends.
* * * * *
    5. Section 261.32 is amended by designating the introductory text 
and the table as paragraph (a) and by amending the newly designated 
table by adding a new subgroup ``Organic dyes and pigments'' and it's 
entries at the end of the table and by adding paragraphs (b) and (c) to 
read as follows.


Sec. 261.32  Hazardous wastes from specific sources.

    (a) * * *

[[Page 40227]]



----------------------------------------------------------------------------------------------------------------
  Industry and EPA hazard-waste No.                     Hazardous waste                       Hazardous  code
----------------------------------------------------------------------------------------------------------------
 
                        *          *          *          *          *          *        *
Organic dyes and pigments:
    K167.............................  Spent filter aids, diatomaceous earth, or          (T)
                                        adsorbents used in the production of azo,
                                        anthraquinone, or triarylmethane dyes, pigments,
                                        or FD&C colorants, unless these wastes do not
                                        contain any of the constituents identified in
                                        paragraph (b)(3)(iii) of this section at a
                                        concentration equal to or greater than the
                                        hazardous level set for that constituent as
                                        demonstrated by the procedures specified in
                                        paragraph (b) of this section.
    K168.............................  Wastewater treatment sludges from the production   (T)
                                        of triarylmethane dyes and pigments (excluding
                                        triarylmethane pigments using aniline as a
                                        feedstock), unless these wastes do not contain
                                        any of the constituents identified in paragraph
                                        (b)(3)(iii) of this section at a concentration
                                        equal to or greater than the hazardous level set
                                        for that constituent as demonstrated by the
                                        procedures specified in paragraph (b) of this
                                        section.
----------------------------------------------------------------------------------------------------------------

    (b) Procedures for determining potential K167 and K168 wastes to be 
nonhazardous. A generator of wastes that fall within the K167 or K168 
listing descriptions must use the following waste analysis and handling 
procedures if it wants to determine that its waste is nonhazardous. If 
the procedures are completed and the waste is determined to be 
nonhazardous within 60 days of [the effective date of the final rule], 
or within 60 days after the waste is first generated, then all of the 
waste generated after the effective date or the first generation date 
is nonhazardous (assuming the levels of the relevant constituents 
identified in paragraph (b)(3)(iii) of this section are in fact below 
the listing levels). If the determination is made more than 60 days 
after [the effective date of the final rule] or 60 days after the waste 
is first generated, the determination will not become effective until 
the date the generator receives a written receipt or confirmation 
(e.g., Registered Mail or delivery service receipt) that its 
notification and certification has been delivered to the EPA. After the 
generator has received this receipt or confirmation, any waste 
generated on or after the generation date of the waste that was 
analyzed for the hazardousness determination is nonhazardous (assuming 
the levels of the relevant constituents identified in paragraph 
(b)(3)(iii) of this section are in fact below the listing levels). Any 
waste generated prior to that generation date remains hazardous.
    (1) Initial waste analysis. The waste generator must collect a 
minimum of 4 representative samples of the waste as-generated and 
analyze it for the constituents identified in the applicable list under 
paragraph (b)(3)(iii) of this section. Instead of analyzing for a 
constituent, the generator may also apply knowledge of the constituents 
in the wastes based on the materials and processes used to document 
that a constituent is not present in the waste.
    (2) Waste holding and handling. The waste generator must store the 
waste until a hazardous waste listing determination is completed as 
specified in the condition in paragraph (b)(3) of this section. The 
waste must be stored in containers, or in another manner that does not 
involve land placement.
    (3) Hazardous or nonhazardous waste listing determination for waste 
as-generated. The waste generator, following an initial waste analysis, 
must make a hazardous or nonhazardous determination for the waste as-
generated based on the data obtained from the initial waste analysis.
    (i) Hazardous determination. If any of the waste sampled contains 
any of the constituents in the applicable list under paragraph 
(b)(3)(iii) of this section at a concentration equal to or greater than 
the hazardous level set for that constituent, the waste is a listed 
hazardous waste and subject to all applicable RCRA Subtitle C hazardous 
waste requirements.
    (ii) Nonhazardous determination. If none of the waste sampled 
contains any of the constituents in the applicable list under paragraph 
(b)(3)(iii) of this section at concentrations equal to or greater than 
the hazardous levels set for these constituents, the waste is 
determined to be nonhazardous and subject only to notification and 
recordkeeping requirements described in paragraph (c) of this section.
    (iii) Hazardous (listing) levels. All concentrations in the waste 
sample(s) for constituents identified in this paragraph (b)(3)(iii) 
that are equal to or greater than the following levels:

                   Constituent Levels for K167 (mg/kg)
   [Levels are not included due to business confidentiality concerns]
------------------------------------------------------------------------
 
------------------------------------------------------------------------
Aniline
Benzaldehyde
p-Chloroaniline
p-Cresol
N,N-Dimethylaniline
3,3'-Dimethoxybenzidine
Diphenylamine
1,2-Diphenylhydrazine
Formaldehyde
Naphthalene
Phenol
p-Phenylenediamine
o-Toluidine
p-Toluidine
------------------------------------------------------------------------
[Other constituent(s) not included due to business confidentiality
  concerns]


                   Constituent Levels for K168 (mg/kg)
------------------------------------------------------------------------
 
------------------------------------------------------------------------
Benzaldehyde...............................................         5000
Dimethylamine, N,N-........................................          300
Diphenylamine..............................................        27000
Formaldehyde...............................................         7000
Toluidine, o-..............................................           13
Toluidine, p-..............................................          23
------------------------------------------------------------------------
[Constituent not included due to business confidentiality concerns]

    (4) Hazardous or nonhazardous waste listing determination for 
wastes after treatment. If a waste that has been determined to be a 
K167 or K168 listed hazardous waste is treated to below hazardous 
levels, the waste generator or treater may make a determination that 
the residue of the treatment process is nonhazardous by applying the 
process set forth for wastes as-generated in paragraphs (b)(1) through 
(b)(3) of this section to the treated waste. The effective date of when 
the residue becomes nonhazardous will be the date when the waste 
generator or treater receives a return receipt or confirmation that the 
notification and certification submitted has been delivered to EPA. 
However, the residue remains subject to the LDR treatment standards for 
K167 or K168 as appropriate.

[[Page 40228]]

    (5) Follow-up analysis. The waste generator must collect and 
analyze a minimum of one representative sample of the nonhazardous 
waste every calendar year it is generated. The waste generator must 
also analyze a minimum of one representative sample of the nonhazardous 
waste anytime, after the initial waste analysis, there is a process 
change that may increase the concentration of hazardous constituents in 
the waste. If process change has not occurred, the waste generator may 
use the results of the initial waste analysis to create a more tailored 
list of constituents for follow-up analysis. If follow-up analysis (or 
any analysis of your waste after the initial waste analysis) shows that 
any of the waste sampled contains any of the constituents in the 
applicable list under paragraph (b)(3)(iii) of this section at a 
concentration equal to or greater than the hazardous level set for that 
constituent, the waste is a listed hazardous waste and subject to all 
applicable RCRA Subtitle C requirements. In order to determine the 
waste nonhazardous again, the waste generator or treater must apply all 
of the procedures in paragraphs (b)(1) through (b)(3) or paragraph 
(b)(4) of this section to the waste.
    (c) Notification and recordkeeping requirements for wastes 
determined to be nonhazardous. These requirements apply only for wastes 
that have been determined to be nonhazardous based on the procedures 
described in paragraph (b) of this section. The waste generator must 
meet the following notification and recordkeeping requirements prior to 
disposing any wastes as nonhazardous.
    (1) Submit notification. The waste generator claiming that its 
waste is nonhazardous must submit a one-time notification to EPA (by 
mail or delivery service which provides return receipt) within 60 days 
following [the effective date of the final rule] or initial generation 
of the waste. The notification must include the waste generator's name 
and address, a representative's name and telephone number, description 
of the waste and potential waste code, and an estimate of the average 
annual volume of waste claimed to be nonhazardous. The notification 
must also include a certification signed by an authorized 
representative and must state as follows:

    I certify under penalty of law that none of the waste sampled 
contains any of the constituents of concern identified for this 
waste at concentrations equal to or greater than the hazardous 
concentration levels set for these constituents, and that these 
levels were determined without dilution of the waste. Based on 
information and belief formed after reasonable inquiry, the 
statements and information in the document are true, accurate, and 
complete. I am aware that there are significant penalties for 
submitting a false certification, including the possibility of fine 
and imprisonment.

    (2) Maintain records on-site. At a minimum, the waste generator is 
required to keep the following information on site:
    (i) A copy of the notification and certification sent to EPA and 
return receipt.
    (ii) The sampling and analysis plan used for collecting and 
analyzing representative sample(s) of the waste.
    (iii) The initial sampling and analyses data and process knowledge 
information (if used) that support a nonhazardous claim for the waste.
    (iv) All follow-up sampling and analyses data and process knowledge 
information (if used) for the most recent three years.
    6-7. Appendix VII to Part 261 is amended by adding the following 
waste streams entries in alphanumeric order (by the first column) to 
read as follows:

Appendix VII to Part 261--Basis for Listing Hazardous Waste

------------------------------------------------------------------------
   EPA hazardous waste No.      Hazardous constituents for which listed
------------------------------------------------------------------------
 
*                  *                  *                  *
                  *                  *                  *
K167........................  Aniline, benzaldehyde, p-chloroaniline, p-
                               cresol, N,N-dimethylaniline, 3,3-
                               dimethoxybenzidine, diphenylamine, 1,2-
                               diphenylhydrazine, formaldehyde,
                               naphthalene, phenol, p-phenylenediamine,
                               o-toluidine, o-toluidine, and other
                               constituents not included due to business
                               confidentiality concerns.
K168........................  Benzaldehyde, N,N-dimethylaniline,
                               diphenylamine, formaldehyde, o-toluidine,
                               p-toluidine, and other constituents not
                               included due to business confidentiality
                               concerns.
 
*                  *                  *                  *
                  *                  *                  *
------------------------------------------------------------------------

* * * * *
    8. Appendix VIII to Part 261 is amended by adding the following 
waste streams entries in alphanumeric order to read as follows.

Appendix VIII to Part 261--Hazardous Constituents

----------------------------------------------------------------------------------------------------------------
                                                                            Chemical
              Common name                    Chemical abstracts name      abstracts No.    Hazardous waste No.
----------------------------------------------------------------------------------------------------------------
 
*                  *                  *                  *                  *                  *
                                                        *
Benzaldehyde...........................  Same..........................        100-52-7  .......................
 
*                  *                  *                  *                  *                  *
                                                        *
p-Cresol...............................  Phenol, 3-methyl-.............        106-44-5  U052
 
*                  *                  *                  *                  *                  *
                                                        *
N,N-Dimethylaniline....................  Benzenamine, N,N-dimethyl-....        121-69-7  .......................
 
*                  *                  *                  *                  *                  *
                                                        *
p-Phenylenediamine.....................  Benzenediamine, 1,4-..........        106-50-3  .......................
                                         Identity of other
                                          constituent(s) not included
                                          due to business
                                          confidentiality concerns.
 

[[Page 40229]]

 
*                  *                  *                  *                  *                  *
                                                        *
----------------------------------------------------------------------------------------------------------------

PART 268--LAND DISPOSAL RESTRICTIONS

    9. The authority citation for part 268 continues to read as 
follows:

    Authority: 42 U.S.C. 6905, 6912(a), 6921, and 6924.

    10. Section 268.32 is added to subpart C to read as follows:


Sec. 268.32  Waste specific prohibitions--dye and pigment wastes.

    (a) Effective [date 6 MONTHS from date of publication of final 
rule], the following wastes are prohibited from land disposal: the 
wastes specified in part 261 of this chapter as EPA Hazardous Waste 
Numbers K167 and K168, soil and debris contaminated with these wastes, 
radioactive wastes mixed with these hazardous wastes, and soil and 
debris contaminated with these radioactive mixed wastes.
    (b) The requirements of paragraph (a) of this section do not apply 
if:
    (1) The wastes meet the applicable treatment standards specified in 
subpart D of this part;
    (2) Persons have been granted an exemption from a prohibition 
pursuant to a petition under Sec. 268.6, with respect to those wastes 
and units covered by the petition;
    (3) The wastes meet the applicable alternate treatment standards 
established pursuant to a petition granted under Sec. 268.44; or
    (4) Persons have been granted an extension to the effective date of 
a prohibition pursuant to Sec. 268.5, with respect to these wastes 
covered by the extension.
    11. Section 268.40 is amended by adding K167 and K168 in 
alphanumeric order to the Table of Treatment Standards to read as 
follows: (The footnotes are republished without change.)


Sec. 268.40  Applicability of treatment standards.

* * * * *

                                                        Treatment Standards for Hazardous Wastes
                                                             [Note: NA means not applicable]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                 Regulated hazardous constituent                      Wastewaters                        Nonwastewaters
                                               ---------------------------------------------------------------------------------------------------------
                        Waste description and                                                                                           Concentration in
     Waste code         treatment/regulatory                                                                                            mg/kg \5\ unless
                           subcategory \1\        Common name      CAS \2\ No.     Concentration in mg/l \3\, or technology code \4\    noted as ``mg/l
                                                                                                                                           TCLP'', or
                                                                                                                                        technology code
--------------------------------------------------------------------------------------------------------------------------------------------------------
 
                   *                  *                  *                  *                  *                  *                  *
K167................  Spent filter aids,        NA.............  NA.............  (WETOX or CHOXD) fb CARBN: or CMBST................  CMBST.
                       diatomaceous earth, or
                       adsorbents used in the
                       production of azo,
                       anthraquinone, or
                       triarylmethane dyes,
                       pigments of FD&C
                       colorants.
K168................  Wastewater treatment      NA.............  NA.............  (WETOX or CHOXD) fb CARBN: or CMBST................  CMBST.
                       sludges from the
                       production of
                       triarylmethane dyes and
                       pigments (excluding
                       triarylmethane pigments
                       using aniline as a
                       feedstock).
 
                   *                  *                  *                  *                  *                  *                  *
--------------------------------------------------------------------------------------------------------------------------------------------------------
Footnotes to Treatment Standard Table 268.40
\1\ The waste descriptions provided in this table do not replace waste descriptions in 40 CFR part 261. Descriptions of Treatment/Regulatory
  Subcategories are provided, as needed, to distinguish between applicability of different standards.
\2\ CAS means Chemical Abstract Services. When the waste code and/or regulated constituents are described as a combination of a chemical with its salts
  and/or esters, the CAS number is given for the parent compound only.
\3\ Concentration standards for wastewaters are expressed in mg/l and are based on analysis of composite samples.
\4\ All treatment standards expressed as a Technology Code or combination of Technology Codes are explained in detail in 40 CFR 268.42 Table 1--
  Technology Codes and Descriptions of Technology-Based Standards.
\5\ Except for Metals (EP or TCLP) and Cyanides (Total and Amenable) the nonwastewater treatment standards expressed as a concentration were
  established, in part, based upon incineration in units operated in accordance with the technical requirements of 40 CFR part 264, Subpart O or part
  265 Subpart O, or based upon combustion in fuel substitution units operating in accordance with applicable technical requirements. A facility may
  comply with these treatment standards according to provisions in 40 CFR 268.40(d). All concentration standards for nonwastewaters are based on
  analysis of grab samples.

* * * * *

PART 271--REQUIREMENTS FOR AUTHORIZATION OF STATE HAZARDOUS WASTE 
PROGRAMS

    12. The authority citation for part 271 continues to read as 
follows:

    Authority: 42 U.S.C. 6905, 6912(a), and 6926.

Subpart A--Requirements for Final Authorization

    13. Section 271.1(j) is amended by adding the following entry to 
Table 1 in

[[Page 40230]]

chronological order by date of publication in the Federal Register, and 
by adding the following entry to Table 2 in chronological order by 
effective date, to read as follows.


Sec. 271.1  Purpose and scope.

* * * * *
    (j) * * *

                                   Table 1.--Regulations Implementing the Hazardous and Solid Waste Amendments of 1984
--------------------------------------------------------------------------------------------------------------------------------------------------------
          Promulgation date                 Title of regulation         Federal Register reference                      Effective date
--------------------------------------------------------------------------------------------------------------------------------------------------------
 
                   *                  *                  *                  *                  *                  *                  *
[Date of publication in the Federal    Dye and Pigment Production     [Federal Register page         [Effective date of final rule].
 Register of final rule].               Waste Listing.                 numbers for final rule].
 
                   *                  *                  *                  *                  *                  *                  *
--------------------------------------------------------------------------------------------------------------------------------------------------------

* * * * *

           Table 2.--Self-Implementing Provisions of the Hazardous and Solid Waste Amendments of 1984
----------------------------------------------------------------------------------------------------------------
                                                                                             Federal Register
           Effective date            Self-implementing provision       RCRA citation             reference
----------------------------------------------------------------------------------------------------------------
 
*                  *                  *                  *                  *                  *
                                                        *
[Effective date of final rule].....  Prohibition on land          3004(g)(4)(C) and       [Date of publication
                                      disposal of K167 and K168    3004(m).                of final rule], [FR
                                      wastes, and prohibition on                           page numbers].
                                      land disposal of
                                      radioactive waste mixed
                                      with K167 and K168 wastes,
                                      including soil and debris.
 
*                  *                  *                  *                  *                  *
                                                        *
----------------------------------------------------------------------------------------------------------------

PART 302--DESIGNATION, REPORTABLE QUANTITIES, AND NOTIFICATION

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

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

    15. In Sec. 302.4, table 302.4 is amended by adding the following 
new entries in alphanumerical order at the end of the table to read as 
follows:


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 RQRQ
             Hazardous substance                 CASRN      Regulatory ---------------------------------------------------------------------------------
                                                             synonyms        RQ      Code         RCRA waste No.          Category   Pounds (Kg)
--------------------------------------------------------------------------------------------------------------------------------------------------------
 
                   *                  *                  *                  *                  *                  *                  *
K167 Spent filter aids, diatomaceous earth,   ...........  ...........          1 *             4  K167                         ...........           ##
 or adsorbents used in the production of
 azo, anthraquinone, or triarylmethane dyes,
 pigments or FD&C colorants.
K168 Wastewater treatment sludges from the    ...........  ...........          1 *             4  K168                         ...........           ##
 production of triarylmethane dyes and
 pigments (excluding triarylmethane pigments
 using aniline as a feedstock).
--------------------------------------------------------------------------------------------------------------------------------------------------------
 Indicates the statutory sources as defined by 1, 2, 3, and 4 below.
*                *                *                *                *                *                *
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.
*                *                *                *                *                *                *
##--The Agency may adjust the statutory RQ for this hazardous substance in a future rulemaking; until then the statutory RQ applies.
*                *                *                *                *                *                *

[FR Doc. 99-17495 Filed 7-22-99; 8:45 am]
BILLING CODE 6560-50-P