ENVIRONMENTAL PROTECTION AGENCY 
     
                     40 CFR Parts 51, 70, and 71
     
                             [FRL-     ] 
     
                    Operating Permits Program and
                  Federal Operating Permits Program 
     
     AGENCY:  Environmental Protection Agency (EPA). 
     
     ACTION:  Proposed rule. 
      
     ------------------------------------------------------------
     
     SUMMARY:  The EPA is today proposing new streamlined
     procedures for revising stationary source operating permits
     issued by State and local permitting authorities or EPA
     under title V of the Clean Air Act (Act).  This proposal is
     a supplement to actions published in the Federal Register on
     August 29, 1994 and on April 27, 1995 as they relate to
     permit revisions.  In addition, today's notice proposes
     changes to the certification that responsible officials of
     permitted sources are required to submit and the emergency
     defense available for violations of permit terms.  It also
     clarifies the application of title I and title V permitting
     requirements to non-major research and development (R&D)
     facilities that are located with sources that are major
     under the Act.  Finally, it proposes to revise the
     procedural requirements applicable to minor new source
     review (NSR) permitting under title I of the Act to clarify
     the flexibility States possess in providing adequate process
     for minor NSR actions.
          Several concerns over complexity and burden of the
     previously proposed permit revision system were raised in
     response to these notices.  As a result, the Agency today is
     proposing to establish a system for revising operating
     permits that is simpler, more flexible, and easier to
     implement than that proposed in the prior notices.
          Implementation of today's proposal would benefit the
     environment primarily through enhanced implementation of,
     and compliance with, air quality control requirements.  The
     extent of benefit would be nationwide and could potentially
     include all requirements of the Act applicable to part 70
     sources.
     
     DATES:  Comments on the proposed regulatory changes must be
     received by [60 days from the date of publication], 1995. 
     Comments on the revised Information Collection Request (ICR)
     for the revised part 70 must be received by [60 days from
     the date of publication], 1995.
     
     ADDRESSES: Comments on the proposed revisions to 40 CFR
     part 70 must be mailed (in duplicate if possible) to:  EPA
     Air Docket (LE-131), Attn:  Docket No. A-93-50, room M-1500,
     Waterside Mall, 401 M Street SW, Washington, DC 20460. 
     Comments regarding the 40 CFR part 71 Federal operating
     permits program must be mailed to the same address, Attn: 
     Docket No. A-93-51.  Please identify comments as pertaining
     to today's proposal notice by date and FR cite.  Comments on
     the draft ICR for the revised part 70 are to be submitted as
     per instructions in Section VI. E., Paperwork Reduction Act,
     of this preamble.
     
          Docket: Supporting information used in developing the
     proposed regulatory revisions to part 70 and part 71 are
     contained in Docket Nos. A-93-50 and A-93-51 respectively,
     at the preceding address.  This docket is available for
     public inspection and copying between 8:30 a.m. and
     3:30 p.m. Monday through Friday.  A reasonable fee may be
     charged for copying.
     
     FOR FURTHER INFORMATION CONTACT:  Regarding proposed
     revisions to part 70, Michael Trutna (919/541-5345), Ray
     Vogel (919/541-3153), or Roger Powell (919/541-5331), mail
     drop 12, United States Environmental Protection Agency,
     Office of Air Quality Planning and Standards, Information
     Transfer and Program Integration Division, Research Triangle
     Park, North Carolina 27711.  Regarding proposed revisions to
     part 71, Candace Carraway (919/541-3189) or Kirt Cox
     (919/541-5399) at the same address.
     
     SUPPLEMENTARY INFORMATION:
     
          Today's proposal reflects the principles articulated in
     the President's and the Vice President's March 16, 1995
     report, "Reinventing Environmental Regulation."  That report 
     establishes as goals for environmental regulation building
     partnerships between EPA and State and local agencies,
     minimizing costs, providing flexibility in implementing
     programs, tailoring solutions to the problem, and shifting
     responsibilities to State and local agencies.  The Agency
     believes that the proposal in today's notice meets the goals
     of the report.
     
     Public Comments
          If possible, comments should be sent in both paper and
     computerized form.  Two paper copies of each set of comments
     are requested.  Comments generated on computer should also
     be sent on an IBM-compatible, 3 1/2 inch diskette and
     clearly labeled.  Please identify comments as pertaining to
     today's proposal notice by date and FR cite.
     
     Table of Contents
          The contents of today's preamble are in the following
     format:
     I.   Background
     A.   Operating Permits Regulations
     B.   Proposed Permit Revision System
     C.   Other Proposed Revisions in Today's Notice
     D.   Environmental Benefits
     E.   August 1994 Proposed Revisions
     II.  Alternative Proposal for Part 70 Permit Revision System
     A.   Overview
     B.   When is a Permit Revision Required
     C.   Automatic Incorporation for Changes Subject to State
               Review Programs
     D.   Incorporation of Changes Not Subject to State Review
               Programs
     E.   Opportunity for EPA to Object and Permit Shield
     F.   Flexible Permits
     G.   Title I Modifications
     H.   EPA Issuance of PSD Permits
     I.   Rulemaking Under Section 302(j)
     J.   Revisions to  51.161
     K.   Incorporation of MACT Standards
     L.   Clarification for Section 112(r)
     M.   Solicitation of Input
     III. Part 70 Program Revisions
     IV.  Proposal for the Federal Operating Permits Program
     A.   Overview
     B.   Changes Subject to State Review Programs
     C.   Changes Not Subject to State Review Programs
     D.   Combination Changes
     E.   Opportunity for EPA to Object and Permit Shield
     F.   Other Part 71 Changes
     V.   Other Changes and Clarifications
     A.   Rationale for Proposed Exemption for Non-major R&D
               Activities
     B.   Emergency Defense
     C.   Certification Language
     D.   Provisions Related to Tribal Programs
     VI.  Administrative Requirements
     A.   Public Hearing
     B.   Docket
     C.   Office of Management and Budget Review
     D.   Regulatory Flexibility Act Compliance
     E.   Paperwork Reduction Act
     F.   Unfunded Mandates
     
     I.  Background
     A.  Operating Permits Regulations
          Title V requires that EPA develop regulations which set
     minimum standards for State operating permits programs. 
     Those regulations, codified in part 70 of chapter I of
     title 40 of the Code of Federal Regulations, were originally
     promulgated on July 21, 1992 (57 FR 32250).  On August 29,
     1994, EPA proposed a number of revisions to the part 70
     regulations as a result of negotiations with litigants who
     petitioned for review of part 70 after its promulgation. 
     The August 1994 proposal included new provisions governing
     permit revision processes.  Today's proposal supplements
     that part of the August 1994 proposal and defines a simpler
     approach to revising permits designed to build upon existing
     State permitting programs.
          Title V also requires that States submit their
     operating permit programs for EPA approval and that EPA
     promulgate and administer a Federal operating permits
     program for States that have not obtained EPA approval by
     November 15, 1995.  The EPA's proposed regulations, to be
     codified at part 71, for the Federal operating permits
     program were published on April 27, 1995 (60 FR 20804).  In
     large part the proposed regulations were modeled on the
     original part 70.  However, the permit revision procedures
     for proposed part 71 were based on the August 1994 proposal
     for part 70 permit revisions.  Today EPA is proposing an
     alternative permit revision process for part 71 that is
     based on today's proposal for part 70 permit revision
     procedures.
     B.  Proposed Permit Revision System
          The August 1994 notice proposed to revise  70.7 of
     part 70 to set out a four-track system for revising
     operating permits.  Comments received at the October 19,
     1994 public hearing and comments submitted to the docket
     indicate that the proposed four-track system was widely
     perceived as too complicated, prescriptive, and disruptive
     to existing State programs.  In response to those concerns,
     EPA sought further input from representatives of State and
     local permitting agencies, industry, and environmental
     groups to learn more directly of their implementation
     concerns.  The EPA received thoughtful ideas from these
     groups about how the process for permit revisions might be
     accomplished in a more streamlined fashion.  The docket for
     today's action contains some specific alternative permit
     revision approaches recommended by these commenters.
          Representatives of the various groups were in general
     agreement on a number of issues.  First, any permit revision
     system would need to be far simpler to implement than that
     laid out in the August 1994 proposal.  Second, it should be
     as streamlined and expeditious as possible so as not to
     impede unduly a source's ability to respond to changes in
     market conditions.  Third, it should provide public process
     commensurate with the environmental significance of the
     change.  Fourth, for changes subject to a State
     preconstruction review program established pursuant to the
     Act (e.g., NSR), public, affected State, and EPA review of
     the more environmentally significant changes should occur
     during the underlying process, instead of a subsequent
     part 70 permit revision process.  Finally, the process
     should maximize State and local agency flexibility.
          As discussed in Section II of this preamble, today's
     alternative proposal satisfies all of these criteria by
     building on underlying State review programs.  After
     considering comments received on today's proposal, EPA
     intends to promulgate final rules regarding permit revisions
     along with the other issues addressed in the August 1994 and
     April 1995 proposals.
     C.  Other Proposed Revisions in Today's Notice
          Today's notice also proposes additional rule revisions
     to address other issues raised by litigants in their
     petitions for review of part 70.  These issues involve the
     current rule's provisions regarding responsible official
     certifications, the emergency defense for violations of some
     types of permit terms, section 302(j) rulemaking regarding
     inclusion of fugitive emissions in the definition of major
     source, and the definition of title I modification.  It also
     proposes to clarify the public review requirements of
     title I and title V applicable to minor NSR permits and
     their subsequent incorporation into part 70 permits.  The
     EPA currently expects to complete rulemaking on these issues
     at the same time it takes final action on the other issues
     addressed in the August 1994 proposal.  Proposed actions
     regarding responsible official certifications, the emergency
     defense, and the definitions of major source and title I
     modification are also included in today's notice with
     respect to the part 71 Federal operating permits program
     provisions.
          Finally, in today's notice EPA is clarifying that non-
     major R&D activities located with a source that is major
     under sections 112 or 302(j) of the Act or parts C or D of
     title I of the Act need not be considered part of that major
     source.  Depending on the extent to which a non-major R&D
     facility contributes to the activity of the major source,
     the R&D facility need not be subject to permitting under
     title I or title V.
          A number of revisions to the definitions in  70.2 are
     included in today's notice to be consistent with the
     proposed revisions.  Other definitions are proposed to be
     added where needed for clarity.
     D.  Environmental Benefits
          The operating permits program provides a uniform
     vehicle for State and local agencies to administer other
     titles of the Act; not only the requirements for attainment
     and maintenance of the national ambient air quality
     standards (NAAQS) but of other provisions such as those to
     protect the public from harmful effects of HAPs.  It is
     through an efficient permit program that many of the
     environmental benefits of these programs are realized.
          Part 70 helps achieve these benefits by giving company
     officials the opportunity to be fully knowledgeable about
     their compliance obligations and creates strong incentives
     for assuring that compliance is maintained.  This will in
     turn result in improved air quality for the public, and
     States will not have to adopt new regulations to meet air
     quality standards to make up for noncompliance with existing
     rules.  In the process of developing permit applications for
     part 70 programs, companies have discovered new uncontrolled
     emission points or air pollution requirements that applied
     to them but of which they were not previously aware.  As a
     result, these facilities are taking steps to comply with
     those requirements.  The vast majority of businesses in this
     country want to comply with environmental regulations.  The
     part 70 program clarifies their obligations while avoiding
     possibly costly litigation.
          Implementation of today's proposal will facilitate
     accomplishing the described environmental benefits.  The
     proposed revisions would focus public and EPA review on, and
     ensure that resources will be targeted to reviewing, changes
     with the most environmentally significant impacts.  In
     addition, the proposed streamlined permit revision system
     assures that permits are speedily revised to include all Act
     obligations for a source while avoiding unnecessary
     procedural delays and opportunity costs.  This will assure
     certainty of compliance obligations for all parties.
          Implementation of today's proposal also will help
     achieve environmental benefits through its requirements for
     flexible permits.  In particular, the flexible permit
     provisions of today's proposal would allow more options for
     sources in designing their title V permits to meet
     environmental obligations.  This increased flexibility would
     allow sources to rely on emissions trading to meet pollution
     control requirements and to use pollution prevention
     approaches which can achieve additional emissions
     reductions.
     E.  August 1994 Proposed Revisions
          The August 1994 proposal is not being withdrawn, but is
     instead being supplemented by today's proposal.  Today's
     proposal primarily addresses provisions in  70.7 for
     revising permits, which was also the primary focus of the
     August 1994 notice.  There were, however, many proposed
     revisions to part 70 in the August 1994 notice that
     addressed other portions of part 70.  These proposed
     changes, which are described in the next several paragraphs,
     are still being considered for promulgation after review of
     comments.  The period of comment has closed for the August
     1994 notice; however, EPA will consider additional comments
     on any of the August 1994 proposed provisions to the extent
     they would be affected by the proposed revisions in today's
     notice.
          In  70.2, revisions were proposed in the August 1994
     notice for the definitions of "Applicable requirement,"
     "Major source," "Potential to emit," and "Responsible
     official."  The notice proposed new definitions for "Major
     NSR" and "Minor NSR" and proposed to delete the definition
     of "Section 502(b)(10) changes."  Proposed revisions to
      70.3 would exempt sources from part 70 applicability if
     they were subject solely because of being major for a
     section 112(r)-only pollutant and would add to the list of
     sources subject to part 70 those sources subject to parts C
     and D of the Act.
          Proposed revisions to  70.4 included consolidating
     provisions for program modification in paragraph (i)(1),
     changing the maximum period for judicial review from 90 days
     to 125 days, changing the time period for acting on early
     reductions permits from 9 to 12 months, revising the interim
     approval criteria for part 70 programs, and adding a
     provision that EPA can continue to issue phase II acid rain
     permits.
          For  70.5, the August 1994 proposal included
     provisions for deleting the 12-month deferral for permit
     application submittals except for new major sources,
     provisions for flexibility in submitting acid rain permit
     applications, clarification of the information needed for a
     permit application to be deemed complete, clarification that
     emissions may not be discounted when determining major
     source status, and addition of the requirement for
     applications to identify units eligible for emissions
     trading.
          Section 70.6 was proposed to be revised to add
     provisions for defining "prompt" with respect to reporting
     deviations from the permit and for defining "upset
     conditions" and to require weekly reporting if the source
     switched to a new alternative scenario unless the type of
     monitoring indicated the switch.
          Changes proposed to  70.7 other than for permit
     revisions included provisions for accommodating changes that
     occur during permit issuance, changing the time period for
     acting on early reductions permits from 9 months to 12
     months, and adding a provision for notifying the public of
     sources covered under general permits.
          Section 70.8 was proposed to be revised to include a
     provision that the public would be notified of the end of
     EPA's 45-day review period.  A clarification was proposed
     for  70.9 that periodic updates of the permit fee
     demonstration were necessary as required by EPA.  Section
     70.10 was proposed to be revised to specify the application
     of sanctions for failure to submit a program or obtain
     program approval and operation of a Federal program. 
     Finally,  70.11 was proposed to be revised to allow mental
     state to be considered for penalties assessed above $10,000.
     
     II.  Alternative Proposal for Part 70 Permit Revision System
     A.  Overview
          Pursuant to the Act, States have adopted programs for
     reviewing and potentially regulating the air quality impacts
     of constructing or modifying sources of air pollution (e.g.,
     NSR).  States will also adopt programs for reviewing changes
     to sources of toxic air emissions prior to their operation
     under certain circumstances.  (For the sake of brevity,
     these programs will be generally referred to as "State
     review programs.")
          Today's proposal for revising part 70 permits builds on
     these State review programs by providing for automatic
     incorporation into part 70 permits of all changes subject to
     those programs.  It makes use of the procedural requirements
     already applicable to those programs to provide adequate
     public review of the part 70 permit revisions occasioned by
     those changes.  For the more environmentally significant
     changes reviewed by State programs, the public, affected
     States, and EPA would have a 30-day review opportunity
     during the State review process.  For all other changes
     subject to a State review program, States would have broad
     discretion to use procedures that are commensurate with the
     environmental significance of the change.  De minimis
     changes (as defined by the State and approved by EPA in the
     State's part 70 program) could be processed without public,
     affected State, or EPA review.  Further, changes subject to
     an applicable requirement that do not conflict with existing
     permit terms could generally be made immediately upon notice
     of the change by the source.
          Since most State preconstruction review programs govern
     nearly all source changes requiring a part 70 permit
     revision, EPA expects the vast majority of changes would
     qualify for this automatic incorporation process.  However,
     for changes that are not subject to a State review program,
     the proposal would provide for a separate part 70 process. 
     The more significant changes of this type would get public
     process consistent with the procedures required for initial
     permit issuance.  For other changes, States would have
     discretion to devise procedures that match the amount and
     timing of public process to the environmental significance
     of the change.  Changes that a State defines and EPA
     approves as de minimis could be processed without public,
     affected State, or EPA review.  Indeed, certain changes that
     render a source subject to a newly applicable requirement
     could be incorporated into the part 70 permit by means of a
     notice submitted by the permittee, so long as the change did
     not conflict with existing permit terms and no source-
     specific determinations need be made in applying the
     requirement to the source.  States would have to provide for
     periodic notification to the public of all part 70 permit
     revisions and for public access to decisions.
          The Agency's opportunity to object to a permit revision
     would generally be limited to the relatively small group of
     more environmentally significant changes.  Even for these
     changes, EPA would be required to object before the State
     took final action on the proposed change for all defects
     that are reasonably apparent at that time.  For de minimis
     changes, EPA would waive its opportunity to object until
     permit renewal.  For all other less environmentally
     significant changes, EPA would waive its opportunity to
     object for a 5-year period after approval of a program
     except in response to a citizen's meritorious petition where
     the error in the permit revision would have a significant
     adverse environmental effect.  During this 5-year period,
     EPA would audit State program implementation to ascertain
     whether its waiver of its review should be suspended or
     extended for one or more States.
          The fundamental premise of this proposal is that the 
     section 502(b)(6) requirement for adequate, streamlined, and
     reasonable permit revision procedures is best met by
     building on State review programs established pursuant to
     the Act.  The Federal regulations governing these underlying
     State programs address most of the procedural requirements
     of title V.  For example, Federal NSR regulations generally
     address the need for, and extent of, opportunities for
     public participation in NSR permitting ( 51.160-161). 
     (The EPA is also proposing revisions to its NSR regulations
     to clarify the extent of States' discretion in providing
     public process for minor NSR permit actions.)  Section
     502(b)(6) does not require more public process than the
     regulations governing these programs require.  To the extent
     a State program meets the requirements of applicable Federal
     regulations, the public procedures afforded by the State
     program are sufficient for title V purposes as well.
          In those few instances where the applicable Federal
     regulations or the State programs themselves do not address
     title V requirements (such as those in  70.6 requiring
     sufficient permit conditions to assure compliance with all
     applicable requirements), States would have to augment
     either their underlying program or their part 70 program so
     as to avoid the need for a part 70 revision process
     subsequent to the State review process.  By building on
     State review programs in this way, title V permit revision
     procedures would be more streamlined than those afforded by
     the current part 70 rule and at the same time provide public
     review of the more significant changes prior to the change
     being made, when public comments can have the most effect. 
     Only where a change is not subject to a State review program
     would the proposal call for a separate title V process to be
     provided.
          Another central tenet of today's proposal is that EPA
     should not prescribe for State part 70 programs detailed
     revision procedures for all or even most potential source
     changes.  As a result of States' differing circumstances,
     State air programs vary widely in scope and the type and
     stringency of controls they impose.  The diversity of State
     requirements is not susceptible to precise or simple
     categorization, so nationally prescribed procedures run the
     risk of being complicated and/or ill-suited to at least some
     types of changes.  The Agency therefore believes that States
     should be afforded broad discretion to determine permit
     revision procedures, including the amount and timing of
     public review, for all but the most significant changes.
          While today's proposal does specify minimum
     requirements for permit revision procedures, it also
     provides that States may obtain part 70 program approval by
     adopting substantially equivalent alternative procedures. 
     States would thus have additional flexibility to craft
     procedures that vary somewhat from the specified minima but
     that achieve substantially equivalent results.
     B.  When is a Permit Revision Required?
          As a starting point, it is necessary to know when a
     permit revision is needed.  In the August 1994 notice, EPA
     proposed to amend the regulations to make clear that permit
     revisions are needed for changes that (1) cannot be operated
     without violating the existing part 70 permit or (2) render
     the source newly subject to an applicable requirement. 
     Today's proposal maintains that approach to defining when a
     permit revision is needed.
          The Agency would like to reiterate that the applicable
     requirements resulting from minor or major NSR are the terms
     and conditions of an NSR permit.  Simply triggering NSR at a
     source with an existing part 70 permit does not in and of
     itself require a part 70 permit revision.  A part 70 permit
     revision would be necessary only to add any new or different
     NSR permit terms that result from the review and any
     additional provisions to assure compliance with them.
          Even changes that would result in application of a
     minor NSR or other requirement might not require a permit
     revision to the extent the permit has been crafted to
     accommodate the change.  For example, a State may create an
     "advance" NSR provision or include a minor NSR standard
     exemption in a source's part 70 permit.  Both of these
     provisions would define the minor NSR requirement applicable
     to a particular change or changes such that the source could
     undertake the changes without an approval process, provided
     that the terms of the advance NSR provisions were met.  In
     essence, the change would already be authorized by the
     permit as long as it met the requirements (including any
     necessary conditions) already in the permit.  A change
     meeting these conditions, therefore, would not trigger a
     part 70 permit revision unless the change contravened a
     permit term or triggered some other applicable requirement
     not provided for in the permit.
          As another example, if a source installs a piece of
     equipment that is subject to a reasonably available control
     technology (RACT) requirement, the installation would not
     require a permit revision if the RACT requirement was
     already adequately described in the permit.  A permit
     revision would be needed only if the installation would
     contravene the permit or trigger some other applicable
     requirement not addressed by the permit.  The source would,
     however, likely need to provide notice to the permitting
     authority describing the equipment being installed and the
     applicable requirement to which it is subject.
          The August 1994 notice proposed to narrow, but not
     eliminate, the current rule's "off-permit" provisions. 
     Under those provisions, a change that a source can operate
     without violating its permit but that renders the source
     newly subject to an applicable requirement may be
     incorporated into the part 70 permit after the change is
     operated, if the State's program provides the off-permit
     mechanism.  Today's proposal, however, would require a
     permit revision by the time the change is operated.  Since
     under today's proposal all changes that undergo a State
     review program would be immediately incorporated into the
     part 70 permit on completion of that review, the need for
     the off-permit mechanism would be substantially reduced. 
     For changes that do not undergo such review but are subject
     to applicable requirements the terms of which do not vary
     from source to source, today's proposal would allow the
     source to revise the permit, and thus operate the change,
     upon notifying the permitting authority, provided the change
     can be operated without violating any existing permit terms. 
     (See Section II. D. of this preamble, Incorporation of
     Changes Not Subject to State Review Programs.)  Today's
     proposed approach would thus ensure that the part 70 permit
     is a contemporaneous and comprehensive summary of all
     applicable Act requirements, an approach most consistent
     with the statutory purposes of title V and favored by many
     State permitting authorities.  Consequently, EPA is
     proposing to eliminate the off-permit provision of the
     current rule if it adopts today's proposed permit revision
     system.
          At the same time, the Agency is interested in receiving
     comment on whether changes that are expressly exempted from
     minor NSR but are nevertheless subject to an applicable
     requirement such as new source performance standards (NSPS)
     or RACT should be allowed to remain off-permit until permit
     renewal.  As explained elsewhere in today's notice, EPA is
     proposing a streamlined means of incorporating such
     requirements into permits that would maintain the
     comprehensiveness of the permit.  The Agency solicits
     comment on whether its proposed revision procedures
     appropriately balance the need for source flexibility and a
     comprehensive permit with regard to these changes or whether
     these changes should only be incorporated into the permit at
     permit renewal.
          It is worth pointing out that today's notice also
     supplements the August 1994 notice's proposed revisions of
     the part 70 regulations implementing section 502(b)(10) of
     the Act.  Under the August 1994 proposal, part 70 would
     implement section 502(b)(10) by providing for the
     establishment of emissions caps in part 70 permits and for
     emissions trading under such caps.  Today's notice provides
     a further explanation in  70.2 and 70.4 of the utility of
     emissions caps and how such caps may be implemented.  It
     further proposes regulatory changes to codify relevant
     definitions and program elements.
     C.  Automatic Incorporation for Changes Subject to State
     Review Programs
     1.  Scope
          As indicated above, today's proposal would establish
     two basic categories of changes for permit revision
     purposes.  The first category would include all changes that
     are subject to State review programs established pursuant to
     the Act.  These changes would be automatically incorporated
     into a part 70 permit upon completion of that review or,
     where the State review program does not require prior
     permitting authority review and approval, upon submission by
     the source of a notice describing the change and identifying
     the requirement applicable to the change.  The second
     category would include all other changes that require a
     permit revision, and States would have broad discretion to
     design a part 70 permit review process for these changes.
          Under today's proposal, the first category of changes
     would include all changes that are subject to major or minor
     NSR or regulations implementing section 112(g) and changes
     that entail a source-specific revision of the State's
     implementation plan (SIP).  The process afforded by these
     State review programs would (1) have to include an adequate
     opportunity for public participation and affected State and
     EPA review, and (2) have to define revisions needed to the
     part 70 permit as a result of the change.
          Under some State minor NSR programs, not all changes
     subject to minor NSR requirements get case-by-case
     permitting authority review and approval.  Instead, some
     types of changes are subject to general rules, and the
     source may make such a change without prior permitting
     authority approval so long as it complies with the
     applicable requirements.  These changes would be included in
     the first category even though they individually do not
     receive affirmative permitting authority review and
     approval.  In the case of such changes, the State has
     determined that particular categories of changes do not
     require case-by-case review and may be adequately controlled
     by application of general requirements.  (Changes subject to
     general rules are typically changes that occur frequently
     enough and are defined and understood well enough that a
     generic approach to their control is both efficient and
     effective.)  Presumably there would also be no need for
     permitting authority review upon incorporation of the change
     into the part 70 permit, unless the change would require
     revision of an existing part 70 permit term.  The Agency
     thus believes that part 70 permits may be revised to reflect
     such changes by means of a notice submitted by the source
     describing the change and the Act requirements newly
     applicable to the source as a result of the change, provided
     the change can be made without violating an existing part 70
     permit term.  As explained further below, a permit revision
     made in this way (i.e., without prior permitting authority
     review and approval) would not shield a source against
     enforcement action for failing to comply with the
     requirements actually applicable to change.
          As also described in more detail below, what
     constitutes an adequate opportunity for public participation
     and affected State and EPA review would vary with the
     environmental significance of the change.  Briefly, for the
     more environmentally significant changes, the full process
     required by the Federal regulations applicable to the State
     review program would be required.  For instance, for changes
     subject to major NSR, a 30-day prior public comment period
     would be required ( 51.160-166).  For less environmentally
     significant changes, States would have discretion to vary
     the amount and timing of public process provided with the
     environmental significance of the change.  The State could
     exempt those de minimis categories of changes subject to
     minor NSR from prior public, affected State, and EPA review
     altogether based on its determination approved by EPA that
     subjecting such changes to review would yield a gain of
     trivial or no value (Alabama Power Co. v. Costle, 626 F. 2d
     323 (D.C.Cir. 1979).  As EPA is making clear in today's
     proposed revisions to the regulations governing NSR, States
     already have discretion to provide public review for minor
     NSR actions commensurate with the environmental impact of
     the change, including exempting de minimis changes from
     public process entirely.
          Process aside, part 70 includes permit content
     requirements not all of which are necessarily addressed by
     current State programs.  To gain part 70 program approval,
     States would have to impose these requirements pursuant to
     State regulations governing either the underlying program(s)
     or the part 70 program.
          Changes subject to a State review program may affect a
     part 70 permit limit not governed by the review program or
     render a source subject to Act requirements in addition to
     those imposed by the review program itself.  For example, a
     change subject to minor NSR may also render the source
     subject to a maximum achievable control technology (MACT)
     standard.  For such "combination changes" the question
     arises as to what revision process applies.  With the
     exception of establishing new monitoring approaches, the
     general rule would be that a combination change (i.e., a
     change that renders a source subject to two or more
     applicable requirements, not all of which are imposed
     pursuant to a State review program) can be processed
     together using the automatic incorporation process, provided
     the change receives public or EPA review in the State
     process as appropriate for the different applicable
     requirements triggered.  For example, where an emissions
     increase is subject to minor NSR and section 112(j) of the
     Act, the change could be processed using the State's minor
     NSR program, but the process provided would have to meet the
     procedural requirements applicable to section 112(j)
     determinations.  As explained in Section II. D. of this
     preamble regarding changes not reviewed under a State review
     program, section 112(j) determinations would be included in
     the category of more environmentally significant changes and
     would thus be subject to a required 30-day opportunity for
     prior public, affected State, and EPA review.
          Under today's proposal, a change would be included in
     the first category of changes and be automatically
     incorporated into a part 70 permit if it is subject to a
     State review program.  Several groups have suggested that
     RACT and MACT requirements that do not entail source-
     specific determinations be eligible for automatic
     incorporation even if the change triggering the RACT or MACT
     requirement is not subject to a State review program.  The
     EPA agrees with the basic premise of this suggestion that
     incorporation of such requirements into part 70 permits
     warrants little or no review, provided they do not conflict
     with any existing part 70 permit term.  Where RACT and MACT
     are so specifically defined that little or no judgement need
     be exercised in applying the requirement to the source,
     there is little to be gained from reviewing the source's
     judgement that the requirement applies.  Instead, it should
     be enough for the source to submit a notice to the
     permitting authority upon making the change stating that the
     source is consequently subject to the MACT or RACT
     requirement and that the notice is attached to the source's
     permit.  Under such a process, the source would not be
     shielded from enforcement action if it were mistaken as to
     the scope or nature of the Act requirements applicable to
     the change.
          The EPA is proposing that such requirements, when
     triggered by a change that is not subject to a State review
     program, be included in the second category of changes but
     nevertheless get the benefit of an automatic incorporation
     process (see Section II. D. of this preamble).  Eligible
     requirements would be those that do not require
     interpretation as to applicability and do not require
     creation of source-specific permit terms or conditions.  The
     justification for automatic incorporation of these types of
     requirements is that their application is so straightforward
     that little is to be gained from additional process.
          The EPA is proposing to place these requirements in the
     second category.  However, the Agency is not now in a
     position to say that no RACT or MACT requirement warrants
     additional process or to catalog which requirements warrant
     additional process and which do not.  While most RACT
     requirements and some MACT requirements now appear
     candidates for automatic incorporation, a determination
     would have to be made for specific requirements whether
     further process is warranted.  In the case of MACT, EPA
     could make that determination when it issues new MACT
     standards, and as the Agency indicated in the August 1994
     proposal, MACT compliance schedules could be automatically
     incorporated into a permit.  As for RACT and other SIP
     requirements, States are in the best position to judge
     whether specific requirements are appropriate for automatic
     incorporation.  States could make such judgments for SIP-
     based requirements and provide for automatic incorporation
     of those it deemed appropriate, as well as for those MACT
     requirements that EPA has determined are eligible for
     automatic incorporation.
          To the extent they must be incorporated into part 70
     permits at all, title VI requirements (relating to
     stratospheric ozone protection) may also be candidates for
     automatic incorporation where they entail few if any source-
     specific determinations.  The Agency solicits comment on
     what title VI requirements would be appropriately processed
     in this way.
     2.  Automatic Incorporation Process
          For changes that are reviewed by a State review
     program, the permitting authority would automatically
     incorporate the change into the part 70 permit immediately
     on completion of the review.  The permitting authority could
     accomplish this by simply attaching the results of the
     review to the part 70 permit.  The source could operate the
     change upon completion of the review process.  For changes
     regulated by a State review program through a general rule,
     the source would submit a notice describing the change and
     the applicable requirements that attach as a result of the
     change.  As part of the notice, the source would have to
     certify that it could operate the change without violating
     any existing permit terms and supply any additional permit
     terms required by part 70 (i.e., periodic reporting
     requirements).  The source could operate the change upon
     submitting the notice.
          Preconstruction permits in many cases impose new
     applicable requirements or alter existing ones.  These new
     or altered requirements and other terms and conditions of
     the new preconstruction permit would be applicable
     requirements for incorporation into the part 70 permit.  Any
     existing terms and conditions of the part 70 permit that no
     longer applied or were revised as a result of the
     preconstruction permitting action would need to be either
     replaced by the new terms and conditions, declared no longer
     applicable, or revised as part of the permit issued pursuant
     to preconstruction review.  The permitting authority would
     then attach this permit upon issuance to the part 70 permit.
          Under the proposed system, it would be important for
     the permitting authority to identify during the
     preconstruction review process which terms of the existing
     part 70 permit would be changed or eliminated because they
     would no longer be relevant.  For instance, during
     consideration of a minor NSR permit for a replacement
     emissions unit, the public notice would need to include
     information about any part 70 permit terms affected by the
     change.  The permitting authority would also have to specify
     in the final NSR action which terms and conditions of the
     operating permit were being revised by the automatic
     incorporation process.  One way for the permitting authority
     to do this would be to prepare an attachment to the permit
     identifying which terms of the part 70 permit were replaced
     or revised.
          The mechanism for automatically incorporating a change
     would also have to ensure that the part 70 permit content
     requirements of  70.6(a) and (c) of the current rule are
     addressed.  Many of these requirements could be included in
     the original part 70 permit as boilerplate conditions, so as
     to cover any subsequent permit revisions.  Requirements
     relating to reporting, annual certification, and inspection
     and entry should translate well to boilerplate conditions. 
     Since new requirements established in a prior review could
     be attached to the part 70 permit, the original part 70
     permit would have to ensure that the boilerplate conditions
     applied to any new requirements attached to the permit as
     well.  On the other hand, some requirements are often
     created or revised on a unit-by-unit basis.  In such cases,
     these requirements would have to be explicitly addressed by
     the State pursuant to its review program.  The permitting
     authority would also have to approve as part of that review
     the adequacy of any associated changes to previously
     approved conditions.
          Under a unitary permit program permitting authorities
     need not attach new or different applicable requirements to
     the permit, provided the unitary permit has already
     incorporated them and contains sufficient terms or
     conditions to assure compliance with any new or different
     applicable requirements consistent with  70.6.  For
     purposes of part 70, a unitary permit means a single permit
     which contains all terms and conditions needed to meet the
     requirements of part 70 and the requirements of major or
     minor NSR or actions requiring review under regulations
     implementing section 112(g) of the Act.
     3.  Criteria for State Review Programs
          Background.  As noted earlier, State review programs
     are generally governed by Federal regulations.  These
     regulations address procedural requirements, including the
     provision of an opportunity for public participation.  In
     the case of major NSR, EPA believes that all State programs
     meet the applicable Federal procedural requirements, which
     call for prior public notice and a 30-day public comment
     period.  Regulations governing section 112(g) are not yet
     final, but States will presumably establish programs that
     comply with the requirements of those regulations.
          Under the applicable Federal regulations, States have
     broad discretion to determine the scope of their minor NSR
     programs as needed to attain and maintain the national
     ambient air quality standards.  Indeed, States may exempt
     categories of changes from minor NSR altogether on de
     minimis grounds (i.e., the change is trivial in size and of
     no importance in safeguarding ambient standards).  States
     have exercised this discretion to subject some or many, but
     generally not all, minor source changes to their minor NSR
     programs.  The EPA does not intend to revisit the scope of
     State minor NSR programs as part of the review process for
     approving State part 70 programs.
          Just as States may exclude some categories of sources
     or changes from minor NSR, they have also exempted at least
     some from public procedures.  The EPA recognizes that States
     may also structure their minor NSR program to limit the
     public process afforded during preconstruction review
     consistent with the environmental significance of the
     change.  Elsewhere in today's notice, EPA is proposing to
     revise the Federal regulations governing minor NSR at
      51.161 to clarify the scope of State discretion in
     affording public process for minor NSR actions.
          As discussed in the August 1994 preamble (59 FR 44478-
     79), the circumstances surrounding some of the exemptions
     from public process in minor NSR programs may have changed
     since they were adopted and thus the basis for these
     exemptions warrant review.  The EPA, however, believes that
     the majority of State minor NSR programs generally afford
     adequate public process for the less environmentally
     significant changes, as EPA is proposing to define them in
     today's notice, for both title I and title V purposes. 
     Indeed, EPA is proposing to revise  51.161 to make clear
     the considerable flexibility States have to fashion public
     participation requirements to the environmental significance
     of changes subject to minor NSR.  The Agency also believes
     that States are in the best position to make an initial
     assessment of the continuing adequacy of their procedures. 
     As further explained subsequently in this preamble, if a
     State's procedures should be found in need of some changes,
     the changes could be accomplished through revisions of
     either the State's minor NSR program or its part 70 program. 
     States would thus have flexibility to make changes in the
     context they found most appropriate.
          Beyond public process requirements, State programs do
     not necessarily address all of part 70's permit content
     requirements, since some of those requirements are not found
     in the Federal regulations governing the State
     preconstruction programs.  Thus, for States to provide
     automatic incorporation for changes that undergo a State
     review program, States may need to revise their regulations
     governing either their part 70 program or preconstruction
     review programs, to ensure that all of part 70's permit
     content requirements are addressed.
          More Environmentally Significant Changes Reviewed by
     States.  For purposes of establishing the adequacy of a
     State review program, today's proposal would divide changes
     subject to such review into two categories, those that are
     more environmentally significant and those that are less
     environmentally significant.  The Agency proposes to include
     in the category of changes that are more environmentally
     significant the following:
          o  Any change subject to major NSR;
          o  Any physical change or change in the method of
               operation of a part 70 source associated with a project
               where the prospective emissions increases from such
               changes, considered by themselves, would be a
               significant emissions increase of any pollutant subject
               to regulation under part C or D of the Act;
          o  Any change subject to review as a modification under
               the regulations implementing section 112(g) of the Act;
               and
          o  Any other change determined by the permitting
               authority to have a similarly significant environmental
               impact.
          The Agency has identified the types of changes listed
     above as being more environmentally significant because they
     either have been specifically identified in the Act for
     preconstruction or pre-operation review (i.e., major NSR
     under parts C and D or prior review under section 112(g) of
     the Act) or involve difficult judgments which affect whether
     construction activity would be subject to one or more of the
     reviews prescribed by Congress (i.e., minor NSR governing
     net-outs).
          While all major NSR actions have been included in the
     category of more environmentally significant changes, EPA
     recognizes that in an extreme ozone nonattainment area any
     change at a major stationary source which results in any
     increase in emissions of nitrogen oxides (NOx) or volatile
     organic compounds (VOC) from a discrete operation, unit, or
     other pollutant emitting activity is a modification subject
     to major NSR.  In the South Coast Air Quality Management
     District (SCAQMD) of California, the only extreme ozone
     nonattainment area, potentially several hundred, if not
     several thousand, major modifications can occur each year
     under applicable definitions of major source (10 tons per
     year (tpy)) and major modification (any increase, as
     described above).  As a comparison, in most areas of the
     country, a major modification does not occur unless there is
     an increase of 40 tpy or more of VOC.
          Today's proposal would require that all changes in the
     more environmentally significant category meet the full
     public process requirements specified by the Federal
     regulations governing the underlying State review program. 
     Thus, for all major NSR changes, including major
     modifications, the State permitting authority would have to
     provide (as is currently required) prior public notice and a
     30-day public comment period.  The Agency is concerned,
     however, that full NSR procedures may be unworkable for
     extreme ozone nonattainment areas in light of the "any
     increase" threshold for triggering major NSR for
     modifications in those areas.  Some relief from the full NSR
     procedural requirements may thus be appropriate for smaller
     major NSR actions in extreme nonattainment areas.  The
     Agency is considering a proposal to revise the Federal major
     NSR requirements to allow States to devise more streamlined
     public procedures for smaller actions in extreme ozone
     nonattainment areas, and it solicits comment on whether and
     how to provide such relief.
          The Agency is proposing to include one category of
     minor NSR changes, i.e., certain net outs, in the more
     environmentally significant category.  Net-outs are minor
     NSR actions which allow a source to avoid major NSR where
     the prospective emissions increases from changes associated
     with a project considered by themselves would require major
     NSR except that the source makes a contemporaneous emissions
     decrease at the same site sufficient to keep the net
     increase below the major NSR applicability threshold. 
     Netting transactions often involve some of the most
     complicated analyses undertaken by permitting authorities. 
     They are also among the most important minor NSR decisions
     permitting authorities make, since they shield changes which
     significantly increase emissions from the control
     requirements of major NSR.  The EPA is concerned about the
     number of net-outs that might be subject to today's proposal
     and the possible burden of requiring 30-day public review. 
     The Agency solicits information from States on the number of
     net-outs that would fall within the proposed category of
     net-outs and the relative difficulty and complexity these
     net-out determinations would typically require.  The EPA is
     also interested in learning from the experience of States
     and industry as to what percentage of net-outs involve a
     project where the prospective emissions increase from a
     single physical change or change in the method of operation
     is greater than the significance levels (as opposed to
     projects comprised of small changes that individually do not
     exceed the significance level but do exceed the levels when
     summed).
          In including net-out transactions in the more
     environmentally significant category, EPA proposes to cover
     those changes where emissions increases from changes
     associated with a project, considered by themselves, would
     exceed major source thresholds or modification levels before
     including decreases at the source.  In a moderate ozone
     nonattainment area, for example, where the major
     modification threshold is 40 tpy for VOC, a 50 tpy VOC
     increase that is offset by an 11 tpy decrease (net 39 tpy
     increase) would be classified as a more environmentally
     significant change, but a 35 tpy increase would not.  In
     keeping with section 182(c)(6) of the Act, the definition of
     covered net outs would also include individual changes whose
     emission increases exceed cumulative major NSR applicability
     thresholds (e.g., 25 tpy over 5 years in severe and serious
     ozone nonattainment areas).
          The Agency considered including in the category of more
     environmentally significant changes minor NSR limits that a
     source undertakes to keep its potential emissions below
     major NSR thresholds.  These limits on emissions which
     create so-called "synthetic minor" sources or modifications
     account for many minor NSR permit actions, and play a
     critical role in shielding large sources or source
     modifications from major NSR.
          The types of controls used to establish synthetic
     minors vary widely among States and sources.  Many are
     straightforward in terms of the limit's effect on emissions
     and its enforceability.  However, others are unique to a
     source and involve assessments of source-specific
     operational limits.  Synthetic minor controls also vary in
     terms of their net effect on a source's emissions.
          The Agency has decided not to propose inclusion of
     synthetic minor actions in the category of more
     environmentally significant changes, largely because of the
     difficulty of formulating a national definition of those
     synthetic minors that merit full public review procedures. 
     Instead, it is proposing to include all synthetic minors in
     the less environmentally significant category of changes
     that undergo prior review.  As subsequently explained in
     more detail, States have broad discretion to fashion
     revision procedures for this category that match public
     process to the environmental significance of the change.  In
     light of the potential environmental significance of
     synthetic minor controls, however, EPA expects each State to
     identify the more significant types of synthetic minor
     actions it issues and afford these a substantial opportunity
     for public and affected State review prior to the State's
     final action in the minor NSR process.
          Several factors would be relevant in identifying the
     more significant synthetic minors.  One is the size of the
     source or modification before the synthetic minor control is
     applied.  In some cases, the source or modification far
     exceeds the applicable major NSR threshold without the
     control.  Another is the use of synthetic minor controls to
     reduce a source's emissions to just below the applicable
     major NSR threshold.  In these cases, the control leaves
     little margin for error.  A third factor to consider is
     whether the synthetic minor control entails the application
     of technology or other control measures whose effect on
     emissions is not well or easily established.  In these
     situations, the permitting authority is required to exercise
     considerable judgment in determining the efficacy of the
     control.  Depending on a State's situation and experience,
     synthetic minor actions meeting any one of these criteria
     may warrant providing prior public review.  Where an action
     meets more than one of the criteria, e.g., where the source
     without controls is very large and the effect of proposed
     controls is not well established, an increased opportunity
     for prior public review and comment may be in order.
          Finally, EPA is proposing that States have discretion
     to designate other types of actions for inclusion in the
     more environmentally significant category.  As explained
     earlier, minor NSR controls vary by State in scope, type,
     stringency, and significance, and States may thus find it
     appropriate to include other types of minor NSR actions in
     the more environmentally significant category.
          Adequate Review for the More Environmentally
     Significant Changes.  For the more environmentally
     significant changes, permitting actions by a State would
     have to follow the full public procedures required by
     existing regulations (or in the case of section 112(g) of
     the Act, those defined in EPA's final implementing
     regulations) with respect to public (including affected
     States) and EPA notice and opportunity to comment.  (As
     discussed earlier, for smaller major NSR changes in extreme
     ozone nonattainment areas, EPA is considering the need to
     revise the Federal NSR regulations to provide for less than
     full process for such changes.)  In the case of minor NSR,
     the Agency is today proposing changes to the Federal
     regulations governing that program to clarify States'
     discretion in affording adequate public process.  For net-
     outs, the only category of minor NSR changes that would be
     included in the more environmentally significant category,
     the proposed revisions of  51.161 would clarify that such
     actions are subject to the full procedures set forth in the
     existing regulations.
          The public process requirements for the more
     environmentally significant changes would include prior
     notice and a 30-day opportunity to comment on the permitting
     authority's proposed action on the source's application for
     the change.  Affected States and EPA would also have to be
     notified and afforded the same opportunity to comment. 
     Because the State review process would have to address any
     part 70 permit revision, the public notice of the change
     would have to contain draft part 70 permit terms as needed
     to revise the existing part 70 permit and to meet the
     part 70 permit content requirements of  70.6(a) and (c).
          Finally, EPA recognizes that in some situations part 70
     permit terms based on decisions made in the preconstruction
     review process may require revision before the source can
     operate the change.  In many of these instances, such
     changes arise from a shakedown period which the source
     undergoes prior to full scale operation.  The Agency
     believes that, in general, shakedown changes are being
     adequately addressed in the day-to-day implementation of
     State NSR programs, and that the State procedures afforded
     these changes should typically suffice for part 70 permit
     revision purposes.  As with the change before shakedown, 
     EPA would expect States to match the type and amount of
     additional review to the significance of the shakedown
     change.  Only where a second major NSR process is necessary
     to review the change (i.e., the change would involve
     substantially new emissions or represent a fundamental
     departure from the previously approved project) would a full
     opportunity for public, affected State, and EPA review of
     the change be required.
          Less Environmentally Significant Changes Subject to a
     State Review Program.  All changes that are subject to a
     State review program other than those designated more
     environmentally significant would be included in a second
     ("less environmentally significant") category.  The changes
     in this second category would range from significant
     synthetic minor actions that shield sources from major NSR
     requirements to changes with minimal environmental impact. 
     States would have the flexibility to vary the process
     provided for the changes in this second category with the
     relative environmental significance of the change.  A State
     may designate certain categories of minor NSR changes,
     subject to EPA approval, as de minimis based upon its
     determination approved by EPA that meets the test prescribed
     by the Alabama Power case.  For changes that fall in these
     de minimis categories, the State may forego prior public,
     affected State, or EPA review altogether.
          As noted previously, most States already exempt at
     least some minor NSR actions from public process.  In
     evaluating what changes may be considered de minimis, many
     factors are potentially relevant and will vary to some
     extent with States' varying situations.  The scope of the de
     minimis category is properly determined on a State-by-State
     basis as permitting authorities develop program revisions to
     meet the revised part 70 requirements.  In determining the
     coverage of the de minimis category, the State should
     examine the relevant factors in the context of the State's
     situation, subject its proposed findings to public review,
     and base its final determination on the relevant record. 
     The State may accomplish this as part of the rulemaking to
     revise its program to conform with EPA's revised part 70
     rule or in a separate rulemaking.
          The most important factor for States to consider in
     identifying de minimis changes is the air quality in an
     area.  Changes that are important in a nonattainment area
     may be of considerably less interest to the public (or EPA)
     in an attainment area.  Due to differences in the nature of
     the air quality problems in different nonattainment areas,
     the need for or appropriateness of EPA and public
     involvement may also vary.
          Another important factor is the emissions impact of the
     types of changes being considered for the de minimis
     category.  In this context, the size of any emissions
     increase and the type of emissions involved are relevant. 
     Smaller increases of relatively less harmful pollutants are
     more likely candidates for de minimis categorization.
          Also relevant is the nature of applicable controls. 
     Changes which are typically addressed by the application of
     well established control technology are not likely to
     require public scrutiny.  Registration requirements pursuant
     to which sources must report, but not necessarily mitigate,
     emission increases below a specified threshold would in many
     States warrant an exemption from public review.  On the
     other hand, public review may be appropriate for changes
     which require unfamiliar control technologies or source-
     specific determinations of control levels.
          A State's prior experience with public interest in
     permitting decisions for particular types of changes is
     another factor the State may weigh.  A State which does not
     now provide public notice and opportunity to comment on
     permit revisions for many or all changes could not use the
     lack of past public involvement in the permitting actions
     for those changes to establish a lack of public interest in
     them.  On the other hand, if a State's experience shows the
     public does not comment or express interest in certain types
     of changes, the State could well conclude that such changes
     are de minimis.  The public's response to the State's
     rulemaking to determine the scope of the de minimis category
     is similarly pertinent.  The general compliance status of
     sources in the relevant jurisdiction may also suggest that
     more or less public oversight of permitting actions would be
     appropriate.
          The factors described above are not mutually exclusive;
     for example, the size, complexity, and track record of
     particular types of changes, when considered together, may
     establish that de minimis categorization is or is not
     appropriate.  The Agency further recognizes that other
     factors may also be relevant, and solicits comment on
     whether other circumstances should also be considered by
     States in determining the scope of the de minimis category.
          In view of the nature and number of the factors
     described above, EPA anticipates that States' determination
     of de minimis changes will justifiably differ, even to a
     significant extent.  In States with relatively extensive
     minor NSR programs, EPA would expect that the de minimis
     category could be established such that the majority of
     changes would be processed as de minimis but the bulk of
     total emission increases governed by minor NSR would be
     subject to public review.  This is because, in the case of
     extensive programs, many or even most minor NSR changes
     typically involve very small emissions increases.  The
     Agency is aware of one State, for example, in which 90 per
     cent of minor NSR changes involve emissions units of less
     than 5 tpy, and those changes together account for only
     about 10 per cent of total emissions increases governed by
     the program.  In this State, defining a de minimis  category
     at or below 5 tpy would mean that only 10 per cent of the
     changes by number would go through public and affected State
     review, but that review would cover 90 per cent of total
     emissions increases.  Such an approach would be acceptable
     under today's proposal and would be an appropriate way to
     minimize the burden of the permitting program on sources and
     permitting authorities without compromising citizens'
     opportunity to participate in decisionmaking regarding the
     bulk of emissions increases.
          By providing the above example, EPA does not mean to
     suggest that States need conduct the type of analysis
     described to determine an appropriate de minimis category. 
     It is merely one example of an acceptable approach to
     defining de minimis changes.  The Agency expects States to
     consider their particular situations and make determinations
     that are appropriate for their situations, in light of the
     relevant factors.  In States with less extensive minor NSR
     programs and less significant air quality problems, for
     example, de minimis changes might be appropriately defined
     to include changes that increase emissions by as much as 25
     tons.  The Agency believes States are in the best position
     to weigh the relevant factors in determining what changes
     may be exempt from public review.  A de minimis change
     category developed based on the factors discussed above
     would be granted substantial deference in EPA's review of
     States' part 70 program revisions.
          Adequate Process for Less Environmentally Significant
     Changes.  For minor NSR actions not in the more
     environmentally significant category, States would have
     considerable discretion to match the amount and timing of
     process to the environmental significance of the change.  In
     reviewing State programs, EPA would recognize States' need
     for flexibility in devising procedures that take into
     account the relevant factors for a particular State,
     including existing air quality levels and the scope and
     complexity of its minor NSR controls.  States would have to
     afford an adequate opportunity for public participation for
     all changes other than de minimis changes, but could use
     various methods including prior or after-the-fact notice and
     comment periods, batch processing, and the use of general
     permits or permits by rule.  For the least significant
     changes, States could provide little public process beyond a
     notice in some manner to the public, which could be after
     the change occurred.  Notice could be given by means other
     than newspapers where alternative methods, such as State
     registers or computer bulletin boards, are generally
     accessible by interested persons.  States should require
     prior notice and comment where actions involve larger
     emissions that warrant greater scrutiny because of their
     environmental significance, although comment periods need
     not be 30 days where a shorter period such as 15 days or
     less would likely be sufficient in view of the significance
     or complexity of the change.
          All minor NSR actions (including those de minimis
     changes exempted from public and EPA review) would have to
     be reviewed by the permitting authority to assure that the
     change met all applicable requirements and the part 70
     permit requirements of  70.6(a) and (c).  In particular,
     changes to monitoring methods in part 70 permits would have
     to be specifically approved by the permitting authority as
     adequate for determining compliance with applicable
     requirements and part 70 permit terms prior to revising the
     permit.
          Program Revisions for NSR Changes. States could revise
     their regulations as needed to provide for adequate review
     of minor NSR changes in two ways:  (1) revise their minor
     NSR regulations as necessary to meet the requirements
     outlined above, or (2) revise their part 70 program
     regulations to provide that those requirements be met in the
     context of the NSR review process.  Either approach would
     ensure that adequate process is provided, so a State may be
     given the flexibility to decide which approach would be most
     suitable for it.
          Comparison of Proposed Approach and Current Part 70 for
     Minor NSR Changes.  Before describing the proposed approach
     for changes not subject to a State review program, the
     Agency would like to compare its treatment under today's
     proposal of minor NSR changes to what is currently required
     under part 70.  The minor NSR process is the origin of the
     vast majority of changes occurring at part 70 sources which
     cause the need for a part 70 permit revision.  It is
     therefore helpful to compare these two regulatory approaches
     to understand the relative effectiveness of the proposal in
     accomplishing streamlining.  This discussion addresses, in
     order, minor NSR changes that would be considered more
     environmentally significant, synthetic minors, other minor
     NSR changes that conflict with the part 70 permit, and
     finally other minor NSR changes that do not conflict with
     the part 70 permit.
          For minor NSR changes which would be classified as more
     environmentally significant changes under today's proposal
     (i.e., major net-outs), both the current and proposed
     part 70 would subject the change to a full public and EPA
     review process involving a 30-day public comment period. 
     Today's proposal, however, would impose this requirement in
     conjunction with the otherwise occurring State minor NSR
     process.  This is a much faster and more efficient process
     than under the current part 70 where the sequential
     significant permit modification process would be imposed
     (possibly for up to 18 months) after the NSR process has
     been completed (unless the State chooses to enhance its
     minor NSR process).
          Whereas part 70 imposes the significant permit
     modification process for synthetic minors, these would be
     considered in the less environmentally significant category
     and subject under today's proposal to a more streamlined
     combined process matched to the environmentally significance
     of the changes.  In addition to shortening greatly the time
     to complete permit revisions via combination of the part 70
     process with other State review processes, today's proposal
     would also limit EPA's review role for less environmentally
     significant changes during the first 5 years after program
     approval.  This would add greater certainty to the critical
     initial implementation of the program.
          Other types of minor NSR changes that conflict with the
     terms of the part 70 permit would be required to be adopted
     as a permit revision before operation under both today's
     proposal and the current part 70.  Under today's proposal,
     EPA expects States to treat these either as de minimis, for
     which no public or EPA review would be required, or as being
     within the category of less environmentally significant
     changes for which process would be matched to environmental
     significance of the change.  For the least significant of
     these changes (other than de minimis), States could provide
     little public process beyond a notice in some manner to the
     public, which could be after the change occurred.  The only
     EPA review for any of the less environmentally significant
     changes over the first 5 years after program approval would
     be in the event of a citizen petition.  Under the current
     part 70, most of these changes, (including those considered
     de minimis under today's proposal), would be processed as
     minor permit modifications.  For minor permit modifications,
     even though the change may be made immediately upon sending
     a notice to the permitting authority and there is no public
     review, the uncertainty resulting from EPA's 45-day review
     period and possible objection after-the-fact is a
     significant concern to sources making changes under this
     process.  Thus, under today's proposal, a key benefit for
     these changes is the 5-year waiver of EPA's objection
     (except in response to citizen's petitions) and the
     exclusion of public, affected State, and EPA review for de
     minimis changes.
          Today's proposal does not differentiate between those
     minor NSR changes that conflict with the terms of the
     part 70 permit and those that do not.  The current part 70
     does allow States to make this distinction.  Specifically,
     source changes reviewed under minor NSR that do not conflict
     with the terms of an existing part 70 permit may be treated
     under the current part 70 as off-permit, meaning the terms
     and conditions of any resulting minor NSR permits need not
     be incorporated into the part 70 permit until renewal.  For
     changes that qualify for off-permit treatment, the source
     must provide contemporaneous notice to both EPA and the
     permitting authority.  This notice requirement is in
     addition to the review process required under the State's
     minor NSR program.  The requirements of  70.6 would of
     course not attach until the off-permit change is
     incorporated into the part 70 permit at renewal.  A change
     that is not off-permit (either because it conflicts with the
     existing part 70 permit or because the State has chosen not
     to allow for off-permit) and that is neither a net-out nor a
     synthetic minor could be treated as a minor permit
     modification.
     D.  Incorporation of Changes Not Subject to State Review
     Programs
          The EPA expects that the great majority of changes
     requiring a part 70 permit revision would qualify for
     automatic incorporation because they are subject to a State
     program such as minor NSR.  However, for changes that are
     not subject to such review, States would have to provide for
     a revision process at the part 70 permitting stage. 
     Depending on the scope of the State's minor NSR program,
     such processing would be needed for changes that trigger
     RACT, MACT, or other applicable Act requirements but not
     minor NSR, or for changes to terms that were established
     only through the part 70 permit process.  As for changes
     that are subject to State review programs as previously
     described, full public, affected State, and EPA review would
     be required only for the more environmentally significant of
     these changes.  For less environmentally significant changes
     that are not subject to State review programs, States could
     develop revision procedures that match the process to the
     environmental significance of the change.
          More Environmentally Significant Changes Not Subject to
     State Review Programs.  Under today's proposal, opportunity
     for public, affected State, and EPA review equivalent to
     that provided for permit issuance or renewal must be
     afforded for the more environmentally significant changes
     before the part 70 permit is revised and the change is
     operated.  For changes that are not subject to State review
     programs, EPA proposes to define the more environmentally
     significant category as including the establishment or
     revision of the following:
          (1)  MACT determinations made under section 112(j) of
               the Act;
          (2)  Alternative emission limits to meet section
               112(i)(5) of the Act (early reductions);
          (3)  Alternative limits established pursuant to
                70.6(a)(1)(iii) including any to implement RACT as
               authorized by the SIP or any substitute section 112
               standards established pursuant to a program approved by
               EPA under section 112(l) of the Act;
          (4) New or alternative monitoring methods that have not
               been authorized for adequacy under major or minor NSR
               or under regulations implementing section 112(g) of the
               Act;
          (5) (Establishment only)  Emissions limits restricting
               the potential to emit (PTE) of an entire source,
               including the establishment of any plantwide
               applicability limit (PAL) for defining applicability of
               NSR or of regulations implementing section 112(g) of
               the Act.
          In revising part 70 permits to establish or change
     (except for PTE limits) any of the above permit conditions,
     the State's part 70 program would have to provide public,
     affected State, and EPA process focused on the change
     equivalent to that afforded for initial permit issuance. 
     The permitting authority would also have to design and
     implement this process so as to complete review of the
     majority of these types of permit revisions within 6 months
     of receipt of an application for such a revision.  The
     requested change could only be made as allowed by the
     underlying applicable requirement(s).  The EPA is proposing
     to reduce the processing time for the majority of these
     changes from the 9-month period specified in the current
     rule to 6 months to promote necessary streamlining and to
     minimize undue delays.  The Agency, however, solicits
     comment on the feasibility of a 6-month turn-around time and
     on other time periods which might better accomplish these
     objectives.
          The proposed list of the more environmentally
     significant changes not otherwise subject to State review
     focusses the most extensive review procedures on a
     relatively manageable number of changes that involve actions
     that have, or potentially have, the greatest environmental
     consequences.  Congress clearly intended that the limits
     associated with section 112(j) MACT decisions and early
     reductions be determined in the context of the title V
     program.  Section 112(j) targets implementation after the
     effective date of the title V program, requires applicable
     sources to file a permit application, and requires the MACT
     limit be placed in a title V permit.  Similarly, Congress in
     section 112(i)(5) required the title V permitting authority
     to establish in a title V permit an enforceable emissions
     limitation for hazardous air pollutants (HAPs) reflecting
     the early reduction which qualifies the source for an
     alternative emission limitation exemption from MACT.
          The EPA is also proposing to include in the more
     environmentally significant list alternative emission limits
     as authorized by an approved SIP or program under section
     112(l) of the Act.  Limits such as alterative RACT or MACT
     are analogous to the two preceding types of limits
     identified by Congress for title V implementation. 
     Accordingly, they warrant extensive review to assure that
     general criteria contained in a SIP or a plan approved
     pursuant to section 112(l) of the Act are applied in a
     reasonable and enforceable fashion to a particular source
     change.  Moreover, as explained subsequently, EPA's
     objection opportunity under today's proposal would fully
     extend only to the more environmentally significant
     categories of changes.  Since under section 110 of the Act
     EPA must be able to object to alternative SIP limits for
     them to qualify as such, it is important to include
     alternative SIP limits in the more environmentally
     significant category of changes.  The EPA solicits comment
     on whether full public, affected State, and EPA review are
     necessary for alternative MACT standards established under a
     section 112(l) program or whether a lesser degree of public,
     affected State, and EPA review would be adequate.
          The establishment of limits on the PTE for an entire
     source or plantwide emissions caps (see below) also warrants
     a similarly high level of review.  Development of such
     limits involves a comprehensive review of a source's
     emissions to restrict a source's emissions to below major
     source thresholds.  Because of the extensive nature of these
     reviews, the Agency believes that a 30-day public review
     period is warranted for establishing such caps.  While
     proposing these actions as being more environmentally
     significant, the Agency does solicit comment as to whether
     the establishment of (as well as revisions to) PTE limits
     can be classified as less environmentally significant,
     particularly for limits related to the applicability of
     minor NSR.
          Finally, the Agency believes that changes involving
     shifts to new or alternative monitoring approaches not
     otherwise matched to the source (e.g., through a prior
     review) can often have potentially large environmental
     impacts, because a new or different monitoring regime could
     inadvertently allow emissions to increase without causing a
     violation of the applicable requirements.  The process
     reserved for more environmentally significant changes is
     appropriate to safeguard the integrity of the compliance
     conditions of the permit unless another prior review serves
     this function (e.g., major or minor NSR under today's
     proposal).  Permitting authorities could approve such
     changes only where the new or alternative monitoring or
     recordkeeping method was determined adequate to assure
     compliance with the applicable requirement.
          The EPA solicits comment on whether any other changes
     not subject to State review programs should be designated
     for inclusion in the more environmentally significant
     category.
          Other Changes Not Subject to State Review Programs. 
     For all other categories of changes for which a part 70
     permit revision is required but that are not otherwise
     subject to State review, a State could develop a process
     that matches the review to the environmental significance of
     the change.  These categories of changes include, but are
     not limited to:
          (1)  Revisions to emission limits restricting the PTE
               of an entire source or any emissions unit, including
               any PALs for defining applicability of NSR, or of
               regulations implementing section 112(g) of the Act;
          (2)  Restrictions on the PTE of any emissions unit;
          (3)  Unique limits designed to meet an applicable
               requirement;
          (4)  New alternative operating scenarios;
          (5)  Changes within the same monitoring method, or
               "intra-monitoring changes;"
          (6) Incorporation of MACT compliance details, including
               applicability and compliance parameter level decisions;
               and
          (7)  Emissions averaging restrictions made pursuant to
               a standard under section 112(d) of the Act.
          For these changes, States again might use various
     methods to provide adequate public participation, including
     prior or after-the-fact notice and comment periods.  As
     noted earlier, sources often take limits on the PTE of an
     entire source to avoid being subject to more stringent
     requirements that otherwise apply.  Sources even more
     frequently take limits on an emissions unit at the source to
     keep the unit below major modification thresholds.  Revising
     plantwide caps or establishing or revising PTE limits for an
     emissions unit involve making judgments regarding the
     sufficiency and practical enforceability of a limit on
     maximum allowable emissions which, if exceeded, would
     trigger the applicability of more environmentally
     significant requirements.  For this reason and as with
     significant synthetic minor NSR actions, EPA would expect
     States to provide relatively more public process for
     significant changes to PTE limits or caps.  It would make
     little sense to require full process to establish such
     plantwide limits or caps if they could be revised with
     little or no process.  Also, the relative environmental
     significance of MACT applicability and compliance parameter
     decisions can vary with the particular MACT standard
     involved.  The EPA, in promulgating individual MACT
     standards, will provide guidance whenever it believes States
     should provide public or EPA review during the permit
     process.
          For those categories of changes that are determined by
     the permitting authority to be de minimis, States may
     incorporate these changes into part 70 permits without prior
     review by the public, affected States, or EPA or an
     opportunity for EPA objection or for citizens to petition
     EPA to object.  The previously described considerations
     relevant to identifying de minimis changes subject to State
     review programs are also relevant in determining that
     categories of changes not otherwise subject to State review
     are de minimis.  States could also exempt from public and
     EPA review on de minimis grounds changes that qualify for
     administrative amendment treatment under section 70.7(d) of
     the current part 70 rule.  These include changes which
     correct typographical errors, require more frequent
     monitoring or reporting by the permittee, or alter ownership
     or operational control of a source.  The State could also
     identify other inconsequential changes as de minimis and
     submit a list of those changes to EPA when submitting part
     70 program revisions for approval.  Either the permittee or
     the permitting authority could initiate the incorporation of
     any such change into the permit by issuing a notice
     describing what information in the part 70 permit is
     affected and sending the notice to the permitting authority
     or the permittee as appropriate.  The notice would identify
     the terms of the existing part 70 permit being changed and
     any new terms needed to meet part 70 permit content
     requirements.  The notice would revise the permit upon its
     mailing by the source to the permitting authority through
     certified mail.  No affirmative authorization by the
     permitting authority would be required if the permittee
     initiates the change.
          Under today's proposal, the State part 70 program could
     also provide that changes need not undergo State, EPA, or
     public review before they are incorporated into the part 70
     permit, provided that (1) they can be operated in compliance
     with all applicable requirements and the federally-
     enforceable terms of the existing part 70 permit, and (2)
     the applicable requirements they trigger do not entail
     source-specific determinations in applying the requirement
     to the source.
          As previously noted, many minor NSR programs exempt
     from minor NSR altogether changes that do not increase
     emissions above a certain amount, or that are of a
     particular type or category.  These changes may nonetheless
     still be subject to applicable requirements such as NSPS or
     SIP requirements.  A small storage tank, for example, may be
     exempt from NSR in certain States, but still may be subject
     to RACT or NSPS requirements.
          To the extent these changes do not conflict with the
     part 70 permit and do not trigger requirements that entail
     source-specific tailoring, EPA is proposing that they may be
     exempt from any additional public, affected State, or EPA
     review in the part 70 process.  The State part 70 program
     could provide that the source may operate the change upon
     submitting a notice, provided that the change can be
     operated in compliance with the existing part 70 permit.  In
     the notice, the source would describe the change, describe
     any new permit terms needed to assure compliance with all
     applicable requirements and relevant part 70 requirements,
     and certify that the change is eligible for this process. 
     The part 70 permit would be revised upon mailing of the
     notice by the source to the permitting authority by
     certified mail.  No permit shield would attach to changes so
     incorporated into permits, since not even the permitting
     authority would have reviewed whether the source correctly
     identified all of the Act requirements applicable to the
     change.
     E.  Opportunity for EPA to Object and Permit Shield
          Under section 505 of the Act, the Administrator is to
     receive and review copies of permit applications, including
     applications for permit revisions, and to object to the
     issuance of any permit which contains provisions that are
     determined by the Administrator as not in compliance with
     the applicable requirements of the Act, including title V
     requirements.  If the Administrator does not object to a
     permit within the 45-day review period specified by the
     statute, any person may petition the Administrator to do so
     within 60 days of the expiration of the 45-day review
     period.  Under the Act, the Administrator may waive the
     requirements for receipt and review of permits for any
     category of sources covered by the part 70 program other
     than major sources.
          In fulfilling its review role with respect to permit
     revisions, EPA will consider whether (1) all applicable
     requirements and part 70 requirements to which the source is
     subject as a result of the change are contained in the
     permit revision, (2) the new or revised permit terms and
     conditions are enforceable as a practical matter, and (3)
     significant procedural requirements relating to adequate
     public participation and development of a supporting record
     have been met.
          At the same time, EPA wants to minimize the potential
     for Agency review to lengthen unduly the permit revision
     process.  The Agency is thus proposing to limit its review
     and objection opportunity in several ways that will focus
     EPA's limited resources on providing a timely reaction to
     the more environmentally significant permit revisions.
          First, for the more environmentally significant changes
     (including those that are subject to a State review program
     and those that are not), EPA is proposing that the Agency
     would be required prior to the permitting authority taking
     final action on the change to raise any objections to the
     proposed change for any defect that was reasonably apparent
     during the public review period.  Failure by the Agency to
     raise a timely objection would bar it from objecting to
     issuance of the permit revision, except in response to a
     citizen's petition under section 505(c). The Agency could
     still reopen the permit for cause under section 505(e) of
     the Act and  70.7(g) of the current rule.
          Second, changes which the State proposed and EPA
     approved as de minimis under the Alabama Power test would
     not be subject to any EPA review or objection opportunity or
     citizen petition opportunity prior to renewal of the part 70
     permit.  Changes which meet the Alabama Power de minimis
     test are by definition environmentally insignificant, and
     EPA is therefore proposing to exercise its inherent
     administrative authority to exempt such changes from the
     public, affected State, and EPA review and objection
     opportunities that otherwise apply prior to permit renewal. 
     To the extent de minimis changes are improperly made or
     incorporated into the permit, corrections can be made by
     reopening the permit or when the permit is renewed with
     little or no cost to the environment, provided the changes
     are in fact de minimis.
          Third, for the less environmentally significant changes
     that do not qualify as de minimis, EPA is proposing to limit
     its review and objection opportunities for at least the
     first 5 years following program approval.  For such changes,
     EPA would object to a change only in response to a citizen's
     meritorious petition under section 505(c) where the permit
     revision at issue would likely lead to significant adverse
     environmental consequences.  During the 5-year period, the
     Agency would rely on consultation with State officials and
     audits of State programs to assist and monitor
     implementation of the permit revision process with respect
     to changes in the less environmentally significant category. 
     Depending on what the audits reveal, the Agency would revise
     as appropriate the time period or scope of the above-
     described limit on its objection authority.  The EPA
     contemplates extending the waiver in States where the audit
     reveals no significant problems due to the waiver, and
     reinstating the objection opportunity in States where the
     audit shows otherwise.
          For changes in the more environmentally significant
     category, EPA would maintain its full authority to review
     and object to permits on its own and in response to a
     citizen's petition.  While the Agency does not plan to
     routinely review all or even most of these changes, EPA
     believes it should retain its authority to do so in light of
     the potentially large emission increases such changes
     entail.
          The Agency believes today's proposed approach to
     exercising its review and objection authority would
     facilitate efficient implementation of the proposed changes
     to the part 70 permit revision process.  Other aspects of
     today's proposal would improve the integrity of part 70
     permit revisions by ensuring public participation
     commensurate with the environmental significance of the
     change and public access to all permit revision decisions. 
     To the extent that potential public involvement increases,
     there is less need for regular EPA oversight.  The Agency
     also recognizes that the first years of implementing any new
     or revised program are the most challenging.  States will
     need time and flexibility to work through the many new
     issues that will inevitably arise as they begin to implement
     a revised permit revision system.  States are more apt to
     seek out EPA's help in addressing difficult issues of first
     impression if EPA is in the role of colleague rather than
     overseer.
          Beyond that, EPA's own resources are limited.  The
     Agency believes that its resources would be best used to
     focus on the more environmentally significant changes and to
     assist and audit States' implementation of their programs. 
     The Agency could, as an exercise of its enforcement
     discretion, simply refrain from objecting to less
     environmentally significant changes.  The Agency believes,
     however, that to realize the full benefits of its proposed
     approach to exercising its objection authority, a regulatory
     limit is necessary.  Regulations specifying EPA's role in
     the permit revision process would best inform the public,
     States, and sources as to what to expect and allow them to
     plan accordingly.  Particularly in the first critical years
     of program implementation, a regulatory limit would provide
     an important measure of certainty and stability at a time
     when all affected groups are learning the new system.
          The EPA is proposing a limit on its authority that
     would coincide with States' early efforts to implement the
     revised program.  The limit on its authority would start
     upon approval of each revised State program that implements
     these revisions to part 70 and would continue for 5 years. 
          During the 5-year period, EPA would work with States to
     facilitate a smooth transition to the revised program.  Once
     State program revisions were up and running, the Agency
     would also conduct audits to determine States' performance
     in meeting minimum program requirements.  In conducting its
     audits, EPA would make use of the applications for permit
     revisions that States are required by section 505(a) of the
     Act and  70.8 of the current rule to send to EPA.  Based on
     the results of these audits, EPA would decide whether to
     revise the regulations to suspend or extend the limit on its
     objection authority for particular States or States in
     general.
          An important safeguard in EPA's proposed approach is
     the ability of citizens to petition the Agency to object to
     a permit revision under section 505(c).  If a citizen's
     petition brings to EPA's attention a permit revision that
     allegedly fails to fully or accurately incorporate all
     applicable requirements, including title V requirements, or
     for which required opportunities for public review were not
     provided, the Agency would review the revision for possible
     objection.  Where its review revealed an environmentally
     significant error in the permit revision, EPA would object. 
     For instance, an EPA objection would be warranted in the
     case of a permit revision that purported to establish or
     revise limits on a source's potential to emit to avoid
     application of major NSR if the permit revision would in
     fact allow increases above major NSR thresholds.  On the
     other hand, errors that did not have an adverse
     environmental effect would not warrant an EPA objection. 
     Correction of such errors could await permit renewal with
     little or no cost to the environment and with significant
     potential savings to the source.
          As a further safeguard, a permit shield would not be
     available for permit revisions to incorporate changes in the
     less environmentally significant category unless they were
     revised and approved by EPA in response to a citizen's
     petition.  In other words, if EPA were to find that a source
     was not complying with an Act requirement that became
     applicable to the source as a result of such a change, the
     Agency could take enforcement action against the source for
     its non-compliance.  The chance that a permit revision would
     somehow incorrectly incorporate applicable requirements due
     to a lack of EPA review would thus be offset by the prospect
     of EPA enforcement of underlying applicable requirements.
          In summary, EPA believes that the benefits of limiting
     its objection authority with respect to the less
     environmentally significant changes outweigh the potential
     risk of the limitations, particularly in view of citizens'
     petition opportunity.  The Agency solicits comment on its
     proposed limitations and on its legal authority to establish
     them.
          Several parties have asked EPA to clarify how it would
     implement EPA's objection opportunity for changes that have
     previously undergone major NSR or minor NSR where a citizen
     petitions for an EPA objection and the alleged error would
     have a significant environmental affect.  Section 505(b) of
     the Act provides for an objection if the permit "contains
     provisions . . . not in compliance with the applicable
     requirements of this Act, including the requirements of an
     applicable implementation plan."  To assure that the permit
     contains provisions that are in compliance with all
     applicable requirements of the Act, including SIP
     requirements, EPA would review a change resulting from a NSR
     action to see if the terms of the NSR permit were properly
     incorporated into the part 70 permit, if the terms are
     enforceable, and if the applicable substantive and
     procedural requirements for public review and development of
     supporting documentation were followed.  For major NSR, EPA
     would review the process followed by the permitting
     authority in determining best available control technology
     (BACT) or lowest achievable emission rate (LAER) to assure
     that the required SIP procedures (including public
     participation opportunities) were substantially met and
     that any determination by the permitting authority was
     properly supported, described in enforceable terms, and
     consistent with all applicable requirements.
          The EPA's purpose in reviewing whether an NSR action
     was consistent with all applicable requirements would be to
     assure that any BACT requirements were at least as stringent
     as any other applicable requirements such as an NSPS and
     that any minimum control requirements specifically
     articulated in the SIP were met.  The EPA would not second-
     guess case-by-case technology determinations that meet the
     minimum criteria set forth above.  For more environmentally
     significant changes subject to minor NSR, EPA would also
     examine the calculations used to base any decision that
     minor rather than major NSR was applicable to the change.
          At the discretion of the permitting authority, the
     permit shield would be available for changes in the more
     environmentally significant category, in view of the public,
     affected State, and EPA review opportunities provided for
     those changes.  For all other changes, the permit shield
     would be available only for terms that are reviewed,
     revised, or added by EPA in response to a citizen's
     petition.
          For permit revisions other than those for de minimis
     changes, citizens would have 60 days after the expiration of
     any EPA opportunity to object, or from the time the
     permitting authority notified the public as to its approval
     of the permit revision, to petition the Administrator to
     make such objection.  As in the current part 70, any
     petition would (1) have to be based only on objections to
     the permit which were raised with reasonable specificity
     during any prior opportunity for public comment (unless the
     petitioner demonstrates that it was impractical to raise
     such objections at that time); (2) have to be based on
     germane and non-frivolous grounds; and (3) have to raise
     issues related to the incorporation of or correctness of
     applicable requirements, enforceability, or procedural
     requirements concerning public review consistent with EPA's
     ability to object.
          The EPA would like to avoid unnecessary petitions
     wherever possible.  Accordingly, the Agency suggests that
     concerned citizens work with EPA early on in the process to
     resolve as many concerns as possible before they rise to the
     level of a formal petition.
          The Agency is aware of industry concerns that
     uncertainty is created by allowing citizens to petition EPA
     to object to less environmentally significant changes. 
     Because such changes by their nature are less
     environmentally significant, industry has suggested that the
     opportunity for citizens' petitions be postponed until
     permit renewal.  The EPA believes that such postponement
     conflicts with the explicit provisions of section 505(b)(2). 
     Moreover, as explained previously, at least some type of
     changes in the less environmentally significant category
     have large potential environmental consequences because they
     shield a source from more stringent environmental controls. 
     The Agency has attempted to address industry concerns by
     allowing States to notify the public of permit revisions on
     a batched basis where sources must make changes frequently
     (see following Section II. F.  Flexible Permits).  The EPA
     also solicits comment on whether there is a legal basis for
     postponing the opportunity for citizen petitions on less
     environmentally significant changes until permit renewal.
     F.  Flexible Permits
          Aside from providing streamlined permit revision
     procedures, a permit system can promote source flexibility
     by providing opportunities to design a permit which will
     minimize the need for permit revisions.  Many ways have been
     identified to achieve this, including use of worst case
     limits and alternative scenarios (56 FR 21748-49, May 10,
     1991).  In addition, as the July 21, 1992 preamble to the
     final part 70 rulemaking stated, there are no limitations on
     changes which do not trigger any applicable requirements and
     which are not prohibited or addressed by the permit.
          Section 502(b)(10) of the Act requires States to design
     their title V programs to allow changes to be made at a
     source without revising the source's title V permit so long
     as the change does not exceed the emissions allowable under
     the permit and does not constitute a "modification under any
     provision of [title I of the Act]."  The current rule
     implements section 502(b)(10) by providing sources with a
     potential means of establishing emissions caps in part 70
     permits.  Caps may be designed such that changes can be made
     at a source without triggering reviews which can produce
     additional applicable requirements (e.g., NSR or section
     112(g) requirements), and thus the need for a permit
     revision, provided emissions do not exceed the cap.  The
     current rule further provides that sources granted such a
     cap may comply with the cap through emissions trading as
     provided by the terms of the cap.
          As discussed in the August 1994 proposal, EPA believes
     that the flexibility afforded by section 502(b)(10) is a
     mandatory minimum element of State permit programs.  In that
     notice, the Agency proposed to revise the current rule to
     require States to establish a cap in a source's permit at
     the source's request, so long as the source proposed a cap
     that met the terms of section 502(b)(10) (as well as the
     enforceability requirements set forth in  70.6).  In
     addition, the Agency proposal would require the permit
     applicant to include in its application proposed replicable
     procedures and permit terms that ensure the emissions cap is
     enforceable and trades pursuant to it are quantifiable and
     enforceable.  Any permit terms and conditions establishing
     such a cap or allowing such trading could be established
     only in a full permit issuance process.  The permitting
     authority would not be required to include in the cap or
     emissions trading provisions any emissions units where the
     permitting authority determined that the emissions were not
     quantifiable or where it determined that there were no
     replicable procedures or practical means to enforce the
     emissions trades.  The permit shield described in  70.6(f)
     could extend to terms and conditions that allowed such
     increases and decreases in emissions.
          As discussed in the July 1992 preamble (57 FR 32267-8)
     and in the August 1994 preamble (59 FR 44471-2), EPA
     encourages the development of trading provisions in part 70
     permits consistent with section 502(b)(10).  As allowed in
     the SIP, the Agency believes that an important option for
     flexibility can be established through part 70 trading
     conditions which are specific enough so that any source
     authorized to use them has a clear method of demonstrating
     compliance through the trading program without the need for
     a permit revision.  As described in more detail in the July
     1992 preamble, the trading procedures approved into the SIP
     must assure that each trade is quantifiable, accountable,
     enforceable, and based on replicable procedures and meets
     the underlying requirements.  One example of the type of
     trading program which could provide such flexibility is the
     open market trading system proposed on August 3, 1995
     (60 FR 39668).  Under this approach, EPA intends to allow
     sources to engage in trading of "discrete emissions
     reductions" to achieve compliance with those applicable
     requirements authorized for such compliance in the SIP and
     in the permit.  Another example would be the "emissions
     budget" program, such as the acid rain program for sulfur
     dioxide, under which sources can use allowances to meet the
     underlying requirements.  It is currently envisioned that
     the part 70 permit need only contain a generic trading
     provision requiring that sufficient discrete emissions
     reductions be held to meet those applicable requirements
     which are open for trading.  Permit revisions would not be
     needed to implement any trades, but the trading rule may
     mandate that the part 70 permit contain certain reporting
     and recordkeeping obligations to assure the integrity of the
     trades themselves.
          Another option for flexibility described in the August
     1994 proposal allows the part 70 permit to contain "advance
     NSR" provisions to the extent compatible with State NSR
     requirements.  Such advance NSR provisions provide for
     including the result of the preconstruction review process
     up front in the operating permit, including any part 70
     permit terms needed to address such future change(s).  Such
     a provision, however, must be compatible with the
     constraints of the applicable requirements (e.g., limits on
     the term of a BACT determination) and be developed with its
     implications of those requirements in mind (e.g., possible
     consumption of the PSD increment).  Many States should
     immediately be able to rely on this provision to avoid the
     need for a separate NSR permit or an operating permit
     revision to be issued when the source actually makes the
     change.  Even where the issuance of a preconstruction permit
     is required, the need for a part 70 permit revision can
     still be avoided unless the NSR process results in new or
     different terms that must be placed in the part 70 permit.
          Several questions have arisen regarding the
     practicality of such caps and advance NSR provisions. 
     Concerns have been raised that these opportunities would be
     severely limited by section 502(b)(10) of the Act.  While
     allowing certain changes at a source to occur without a
     permit revision, this provision excludes title I
     modifications from this relief and subjects eligible changes
     to a 7-day advance notification requirement.
          The EPA believes that section 502(b)(10) was enacted by
     Congress to provide additional flexibility to sources and
     not to restrict any flexibility that already may be
     available under the regulations governing applicable
     requirements.  For example, section 502(b)(10) would not
     preclude the incorporation into a part 70 permit of an NSR
     permit which defines how future changes at a source could
     occur in a manner that would meet the relevant NSR
     requirement.  The part 70 permit itself may also define the
     scope of future NSR obligations for the source so long as
     this is allowed under the State's permitting program.  No
     NSR requirements are circumvented under such an approach. 
     Rather, compliance is determined beforehand so that the
     source may operate the pre-approved change without first
     obtaining a permit revision.  The source would effectively
     have a blueprint analogous to a type of alternative scenario
     under which to operate if any of the pre-approved NSR
     changes were to occur.
          The exact design of an emissions cap to meet
      70.4(b)(12)(i) of the August 1994 proposal and section
     502(b)(10) will depend on the nature of the prospective
     source operation and the scope of the relevant applicable
     requirements, including the State's NSR programs and of
     regulations implementing section 112(g).  For example, in
     one State it may be possible to define a PAL (or series of
     PALs) which defines when such requirements would be
     triggered.  In other situations (e.g., where minor NSR
     applies and requires a case-by-case technology review
     whenever new capacity would be established), the PAL or
     series of PALs would need to be coupled with an advance NSR
     provision to address all NSR situations including those
     requiring an advance technology review of any changes for
     which pre-authorization was sought under the PAL.
          Concerns have been raised that the 7-day advance notice
     provision of section 502(b)(10) could hinder a source's
     ability to respond quickly to changing market conditions by
     making changes already authorized under a cap.  The Agency
     believes that the section 502(b)(10) notification
     requirement can be met by a generic notice describing a
     class of trades authorized by the permit and the source's
     intent to engage in such trades during a specified period of
     time.  This notice must be sent at least 7 days prior to
     initiating trading of emissions under the cap, which
     incidentally could require notification during permit
     issuance where a facility intends to trade as soon as it
     receives its permit.
          Concerns have also been raised that caps created
     pursuant to the regulations at  70.4(b)(12) implementing
     section 502(b)(10) would be severely limited if the Agency
     were to interpret the title I modification limitation in
     502(b)(10) to include changes subject to minor NSR.  As
     discussed in the next section of this preamble, (see Section
     II. G.  Title I Modifications), the Agency is proposing to
     add regulatory language that defines the scope of title I
     modification to clearly exclude modifications subject to
     States' minor NSR programs.  This action would directly
     resolve these concerns.  Thus, under today's proposal, this
     definition of title I modification will enhance the ability
     of sources to design emissions cap permits pursuant to
     section 502(b)(10).
          To promote greater certainty in implementing caps under
     section 502(b)(10), the Agency proposes to codify into the
     part 70 regulations the previous clarifications regarding
     emissions caps and advance NSR provisions.  Under today's
     proposal, EPA would build upon its August 1994 proposal by
     defining in  70.2 advance NSR, alternative scenarios,
     emissions cap permits, and PALs.  The Agency further
     proposes to add to  70.4(b)(3) the obligation to issue
     emissions cap permits pursuant to  70.4(b)(12)(i)
     (regarding the mandatory nature of emissions caps) as the
     Agency proposed to revise it in the August 1994 proposal. 
     This would require a permitting authority to accept
     enforceable permit conditions proposed by a part 70 source
     that (1) establish limits that keep the source from being
     subject to requirements that apply above the limit and (2)
     assure compliance with requirements applicable to future
     operations in which the source may engage so as to avoid
     permit revisions.  These conditions would be established
     during permit issuance or permit revision procedures for the
     more environmentally significant changes.
          To illustrate the type of flexibility that is available
     using a part 70 created cap incorporating advance NSR, the
     Agency refers readers to a draft permit providing a plant-
     wide emission limit for a semiconductor facility.  A copy of
     this permit is available in the docket for this rulemaking. 
     This permit, when final, will include terms that allow the
     source to undertake process changes without a permit
     revision by combining an emissions cap on HAPs that renders
     the source a synthetic minor and an emissions cap on
     criteria pollutants with an advance NSR provision
     authorizing certain types of changes involving VOCs and
     specific exemptions for insignificant activities and
     emissions.  Under this draft permit, the source's routine
     changes will not trigger a part 70 permit revision
     obligation so long as:  (1) each change complies with
     applicable RACT and SIP requirements; (2) each change
     triggers no newly applicable requirement; and (3) total
     emissions do not exceed an aggregate emission limit for
     VOCs.  This permit also incorporates additional conditions
     for pollution prevention planning, reporting, and training
     to assure compliance with the emissions cap.  The final
     permit will also contain monitoring and other conditions
     sufficient to demonstrate compliance with the VOC emission
     limit.
          While this permit is not yet final, EPA considers the
     basic approach used in this permit as acceptable and
     appropriate under part 70 and anticipates that it will serve
     as a useful model which offers operational flexibility in an
     environmentally protective framework.  When a final decision
     is made on the specific permit, it will be placed in the
     docket for today's rulemaking.
          The EPA encourages the use of the approach employed in
     the draft permit by permitting authorities seeking to 
     minimize administrative burdens and maximize the flexibility
     of regulated facilities, particularly those which make
     frequent process changes that have a relatively small impact
     on emissions.  The EPA does note, however, that the terms
     and conditions needed to meet minor NSR in advance may well
     vary from State to State.  In particular, States with case-
     by-case control requirements approved as part of their minor
     NSR programs may require more specific conditions to allow
     sources to qualify for advance NSR.  The EPA solicits
     comment on the acceptability and effectiveness of this
     approach.
          Concerns have also been raised regarding the vast
     quantity of trivial changes that can occur each year at
     certain sources, including those in the electronics sector. 
     These changes are peripheral to the core processes of a
     source and often do not affect emissions.  In these cases,
     other types of advance NSR conditions are potentially
     useful.  In particular, the part 70 permit can define in
     advance a list of activities which the permitting authority
     acknowledges are not physical changes or changes in the
     method of operation and therefore do not trigger minor NSR. 
     Such changes when they subsequently occur would not
     precipitate the need for a part 70 permit revision, since
     they would not trigger minor NSR.  The list of these
     activities developed by the Oregon Department of
     Environmental Quality which EPA has placed in the docket
     serves as an example of what might be defined in individual
     permits.
          Finally, the Agency would like to clarify that NSR
     registration provisions under an EPA-approved minor NSR
     program that only require reporting of changes in emissions
     levels, provided total emissions stay below certain
     prescribed limits, could often be treated in the part 70
     permit as a generic requirement which requires any necessary
     reporting or notification by the source to the permitting
     authority but does not require a revision to the permit. 
     Alternatively, implementation of such NSR registration rules
     would be eligible for permit revision by source notice (see
     the previous discussion, Other Changes Not Otherwise
     Reviewed by States) where the applicable requirement itself
     allows for updating the permit through a notification
     procedure.  Where neither of these approaches to SIP-
     required NSR registration can be implemented (e.g., State
     requires individual permit revisions for each transaction),
     the Agency solicits comment on the ability to allow
     permitting authorities to collect and batch process changes
     over a month's time period and conduct one part 70 permit
     revision at that time.  This option would be available only
     for those changes that were defined by the program as being
     individually eligible for this treatment and that did not
     conflict with the part 70 permit.
     G.  Title I Modification
          The meaning of the section 502(b)(10) limitation,
     "modifications under any provision of title I," has been
     disputed since the rule's promulgation.  In its proposed
     rule to revise the criteria for granting State programs
     interim approval (59 FR 44572 (August 29, 1994)), EPA
     proposed that the phrase "modifications under any provision
     of title I" would include not only changes subject to the
     major NSR requirements of parts C and D of title I but also
     those subject to minor NSR programs established by the
     States pursuant to section 110(a)(2)(C), which is also in
     title I.  Based on that reading, EPA in August 1994 proposed
     in part to interpret the title I modification language of
     the current rule (which is found in the provisions governing
     minor permit modification procedures and off-permit as well
     as those implementing section 502(b)(10)) to include minor
     as well as major NSR.
          In response to the August 1994 proposal, EPA received
     many comments from industry and States strongly contending
     that the proper interpretation of the title I modification
     limitation of the current rule should be read to exclude
     minor NSR.  These commenters noted that EPA had itself
     effectively defined the term to exclude minor NSR in the
     preamble to the May 1991 proposed rule (56 FR 21746-47 and
     footnote 6).  They argued that commenters on the May 1991
     proposed rule relied on that definition, that EPA did not
     change the definition in promulgating the final rule in July
     1992, and therefore that EPA was not free to change its
     interpretation without undertaking further rulemaking.  Many
     comments also pointed out that EPA's August 1994 proposal to
     include minor NSR in the scope of title I modifications
     would have the effect of greatly reducing, and in some cases
     virtually eliminating, the relief that Congress sought to
     provide sources under section 502(b)(10) (i.e., to avoid
     permit revisions for changes that do not increase allowable
     emissions and are not title I modifications).
          Most small changes at sources, if they are subject to
     any Act requirements, are subject to minor NSR.  Conversely,
     if they are not subject to minor NSR, they are generally not
     subject to any other Act requirements.  Since changes that
     are not subject to any Act requirement and not otherwise
     barred by the permit may be made without revising the
     permit, limiting the scope of section 502(b)(10) to changes
     that are not subject to either minor or major NSR or section
     112(g) would limit the relief provided by that section to a
     relatively small number of changes in most States.  Only
     changes below the threshold for minor NSR set by the State
     would be eligible as a section 502(b)(10) change.  In States
     with extensive minor NSR programs (e.g., those with low
     thresholds or those where any increase in emissions is
     considered a modification and therefore subject to minor
     NSR), virtually no changes would be eligible for section
     502(b)(10) treatment.  Depending on the State, interpreting
     title I modifications to include minor NSR would thus mean
     that few if any source changes could be accomplished under
     section 502(b)(10), and would thereby frustrate Congress's
     intent in enacting section 502(b)(10) to minimize the need
     for a permit revision.
          Many commenters to the August 1994 proposal suggested
     that in using the phrase "a modification under any
     provision" of title I Congress was referring to those
     modifications which title I itself defines, generally by
     means of an emissions level above which specified control
     requirements apply.  Parts C and D of title I and section
     112(g) all specifically define the term "modification" for
     purposes of those provisions.  By contrast, section
     110(a)(2)(C), the basis for State minor NSR programs, does
     not define the term "modification."  What constitutes a
     modification for minor NSR purposes is a matter for each
     State to decide in fashioning its minor NSR program, and
     under the statute and applicable regulations, States have
     broad authority to determine the scope of their minor NSR
     programs.  Many commenters contended that Congress, by
     limiting the scope of section 502(b)(10) to changes that are
     not title I modifications, intended to establish size
     thresholds for those changes that could be made using the
     flexibility afforded by that section and that the intended
     size thresholds are those contained in the provisions of
     title I itself.
          The EPA believes that the term title I modification
     should be read in the context of section 502(b)(10) as not
     including minor NSR.  While the statutory term,
     "modifications under any provision of title I," is arguably
     broad on its face, giving the term its broadest meaning
     would largely (and in the case of some States, almost
     entirely) frustrate Congress' clear intent that sources be
     afforded flexibility under States' title V programs to make
     some changes that do not require a permit revision.  As
     commenters noted, virtually no changes would be eligible for
     section 502(b)(10) treatment in States with extensive minor
     NSR programs if EPA adopted the broadest interpretation.
          The House Report on the Clean Air Act Amendments of
     1990 indicates that the drafters of title V were interested
     in establishing minimum criteria for State programs to
     afford some measure of national uniformity in title V
     permitting.  H.R. Report 101-490, 103 Cong., 1st Sess., p
     343.  Those minimum criteria are spelled out in section
     502(b), including in section 502(b)(10).  In light of the
     legislative history, EPA believes that it would be
     inappropriate to define the title I modification limitation
     on the flexibility afforded by section 502(b)(10) in a way
     that could and does vary widely, depending on the scope of a
     State's minor NSR program.  The obvious sizing purpose of
     the title I modification limitation also strongly suggests
     that Congress had in mind the thresholds it established
     elsewhere in title I, not the thresholds that States are
     free to set in fashioning their minor NSR programs.
          To interpret the title I modification limitation to
     include minor NSR might also have the counterproductive
     effect of creating an incentive for States to scale back the
     scope of their minor NSR programs.  If title I modification
     were interpreted to include minor NSR, States interested in
     allowing their sources to take more advantage of the
     flexibility offered by section 502(b)(10) might find it
     necessary to narrow the scope of their minor NSR programs
     (e.g., set higher threshold levels) so that more changes
     would escape being classified a title I modification.  But
     the 1990 Amendments to the Act are Congress' testament that
     more, not less, needs to be done to clean up the nation's
     air.  States with extensive minor NSR programs are generally
     those States which face the stiffest challenge in meeting
     and maintaining national air quality standards.  It would be
     counterproductive if States were pressured to cut back their
     air pollution control programs for new or modified sources
     to take advantage of title V permitting flexibility when
     those programs are needed more than ever to achieve clean
     air.
          As previously noted, the issue of the proper
     interpretation of the term title I modification is also
     relevant to the scope of the current rule's minor permit
     modification provisions.  Those provisions allow any change
     that meets specified criteria, including not being "a
     modification under any provision of title I," to be
     incorporated into a title V permit using streamlined
     procedures which do not include an opportunity for public
     participation.  In the case of these provisions, the title I
     modification criterion is not derived from the statute but
     was promulgated by EPA as a means of sizing changes eligible
     for minor permit modification procedures.  Here, too, the
     phrase used by the Agency to describe the limitation is
     broad on its face.  However, EPA acknowledges that it
     effectively characterized the scope of that term in its
     explanation in the May 1991 proposed rulemaking preamble and
     that States and sources have relied on that explanation. 
     The Agency thus believes that the term should be interpreted
     in that manner for purposes of the current rule.
          Today's notice is a proposal, and EPA thus intends to
     codify in regulatory language the interpretation of title I
     modification described above at the same time it takes final
     action on the other issues it is addressing in this and the
     August 29th proposal to revise the part 70 rule.  As
     indicated above, the Agency believes that the term title I
     modification as it appears in section 502(b)(10) and the
     current rule should be read to exclude changes subject to
     minor NSR.  Consequently, EPA intends to promulgate the
     regulatory language defining title I modification as
     proposed in the August 1994 Federal Register, except that
     the definition would not include the reference to section
     110(a)(2) of the Act.
     H.  EPA Issuance of PSD Permits
          Under today's proposal, the permitting authority would
     be required to revise immediately the part 70 permit upon
     issuance of a PSD permit to accomplish the streamlining
     intended for changes with prior process.  In States that do
     not have a PSD program approved into the SIP, however, the
     previous discussion regarding the automatic incorporation
     into part 70 permits of changes with State review requires
     clarification in States without approved PSD programs,
     several situations are possible:  (1) EPA issues the PSD
     permit as the issuing agency, (2) EPA signs the PSD permit
     in a PSD program partially delegated to the State, or (3)
     the State issues the permit acting as EPA's agent under a
     fully delegated, but not SIP-approved, PSD program.
          A State with an approved part 70 program should always
     be able to enforce a PSD permit that is attached to a
     part 70 permit (even if the EPA issues the PSD permit). 
     Where the PSD permit does not meet the requirements of
     part 70, the State may need to create a separate part 70
     permit revision (EPA cannot revise the part 70 permit
     because it is not the part 70 permitting authority) to
     supply the terms necessary to meet the requirements of
      70.6(a) and (c).  Other applicable requirements (e.g.,
     MACT standards) that apply to the source but that are not
     included in the PSD permit would need to be included as well
     in the part 70 permit revision.  Close coordination between
     the State and EPA could allow the part 70 permit revision
     and the PSD permit to be issued using the same public and
     EPA review process, if that is desired.  Once the PSD permit
     is issued by EPA and the supplemental part 70 revision is
     completed by the State, the State would automatically
     incorporate both the PSD permit and the part 70 permit
     revision into the existing part 70 permit by attaching them
     to the existing part 70 permit.
          In the case where the State permitting authority must
     also issue its own preconstruction approval under minor NSR
     (e.g., to cover additional pollutants and/or requirements)
     before construction of a PSD source or modification can
     proceed, the permitting authority would have to develop any
     additional part 70 permit terms to meet part 70 and place
     these into the minor NSR permit.  Most often, the minor NSR
     permit should also contain the provisions of the part 70
     revision (previously described).  Upon issuance, the State
     NSR permit could be automatically incorporated along with
     any independent PSD permit into the existing part 70 permit
     although the incorporation of these documents does not
     necessarily have to occur simultaneously.
          The Agency solicits comment on this approach to
     accomplishing streamlined permit revisions for incorporation
     of PSD permits.  In particular, EPA solicits comment on
     whether permitting authorities which do not have adequate
     authority to issue PSD permits directly should be afforded
     additional time to incorporate those permits satisfactorily
     into relevant part 70 permits.
     I.  Rulemaking Under Section 302(j)
          The current definition of major source in part 70
     requires sources to count fugitive emissions in determining
     major source status for PSD and nonattainment NSR purposes
     when the source category is subject to a standard
     promulgated under section 111 or 112 of the Act, regardless
     of when the standard was established.  As discussed in the
     August 1994 proposal notice, EPA agrees that it did not
     follow the procedural steps necessary under section 302(j)
     to expand the scope of source categories in the current part
     70 regulations for which fugitives must be counted in making
     NSR major source determinations (59 FR 44514).  In that
     notice, EPA proposed to change paragraph (2)(xxvii) of the
     definition of major source such that only a source belonging
     to a source category subject to a section 111 or 112
     standard promulgated as of August 7, 1980 would be required
     to count fugitive emissions of the pollutant regulated by
     that standard in determining if it were major for NSR
     purposes.  The EPA no longer believes that revising this
     category as was proposed is the appropriate approach. 
     Rather, EPA believes that this paragraph needs to be revised
     to allow for future affirmative actions under section 302(j)
     to avoid the need for subsequent revisions to State part 70
     programs and to be consistent with the NSR program.
          In a notice of proposed rulemaking to revise NSR
     regulations implementing parts C and D of title I of the Act
     that will be published in the near future, the Agency will
     solicit comment on amending the listed source categories for
     which fugitive emissions must be counted in determining
     whether a source is major.  This rulemaking action is being
     taken to satisfy the requirements of section 302(j) which
     requires that fugitive emissions be included in major source
     determinations only ". . . as determined by rule by the
     Administrator."
          Under EPA's longstanding interpretation, section 302(j)
     involves a two-step rulemaking process.  The EPA will
     propose to list a source category if emissions from that
     category have a potential for significant air quality
     deterioration, and will make a final listing unless
     commenters demonstrate that the social and economic costs of
     regulation would be unreasonable in comparison to the
     benefits (see e.g., 49 FR 43202, 43208 (1984)).  The EPA's
     interpretation has been upheld on judicial review (NRDC v.
     EPA, 937 F.2d 641, 643 (D.C. Cir. 1991)).
          Because EPA will be undertaking the future section
     302(j) rulemaking, EPA no longer believes that it would be
     appropriate for parts 70 and 71 to definitely refer to the
     August 7, 1980 date provided in the August 1994 part 70
     proposal and the April 1995 part 71 proposal.  Until EPA
     promulgates this future section 302(j) rulemaking, EPA
     believes that fugitives should not be counted for source
     categories subject to section 111 or 112 standards
     promulgated after August 7, 1980.  Consequently, to
     facilitate ongoing consistency with whatever affirmative
     section 302(j) determination the Administrator has made at
     any point in time, EPA proposes to revise parts 70 and 71 to
     require that fugitive emissions be included for source
     categories subject to standards promulgated under
     sections 111 or 112 for which the Administrator has made an
     affirmative determination under section 302(j).
          The result of this approach would be that source
     categories currently subject to section 111 or 112 standards
     promulgated after August 7, 1980 would not have to count
     fugitives unless and until EPA completes this section 302(j)
     rulemaking to require that fugitives for these source
     categories be counted.  Moreover, once this section 302(j)
     rulemaking has been completed, this approach would result in
     fugitive emissions from any source categories listed through
     a section 302(j) determination being counted for purposes of
     the title V definition of major source as well.
          Finally, when new section 111 or 112 standards are
     promulgated and contain affirmative section 302(j)
     determinations, those determinations would carry over for
     purposes of title V.  This approach would ultimately avoid
     any need to revise parts 70 and 71 every time a new
     section 302(j) rulemaking is conducted and would relieve
     State and local agencies from having to submit revised
     part 70 programs for EPA approval solely because the
     Administrator has made an affirmative section 302(j)
     determination.  The EPA solicits comment on this approach.
          In addition, EPA is proposing to delete the language in
     paragraph (2)(xxvii) of the major source definition in the
     current part 70 regulations, the August 1994 part 70
     proposal, and the April 1995 part 71 proposal which reads:
     ". . . but only with respect to those air pollutants that
     have been regulated for that category; . . ."  The EPA
     believes that this revision is necessary to make the
     parts 70 and 71 definitions of major source consistent with
     the definitions of major source in parts 51 and 52.  While
     the corresponding language in the NSR rules would require
     that sources in these categories consider fugitive emissions
     of all air pollutants in determining whether they are major,
     the current part 70 regulations, the August 1994 part 70
     proposal, and the April 1995 part 71 proposal would exclude
     emissions not directly regulated by the 111 or 112 standard
     for that category.  This could result in sources being major
     for purposes of NSR, but not being major for purposes of
     title V.  This is inconsistent with the section 501(2)
     definition of major source which requires any stationary
     source to be considered major under title V if it is a major
     source under section 112 or a major stationary source under
     section 302 or part D of title I.
          Finally, EPA proposes to modify paragraph (2)(viii) of
     the major source definition in the current part 70
     regulations, the August 1994 part 70 proposal, and the
     April 1995 part 71 proposal which reads: "Municipal
     incinerators capable of charging more than 250 tons of
     refuse per day; . . ."  This paragraph needs to be modified
     to read: "Municipal incinerators (or combinations thereof)
     capable of charging more than 50 tons of refuse per
     day; . . ."  This correction needs to be made to be
     consistent with the NSPS for incinerators promulgated at
      60.50 in 1977 and which applies to incinerators with a
     charge rate of more than 50 tons per day.  This proposed
     revision is also consistent with the list of major
     stationary sources in section 169(1) of the Act.
          The EPA proposes to clarify that, for municipal
     incinerators, the capacity threshold for tons of refuse
     fired per day is for the combination of all municipal
     incinerator units at a source.  For example, a municipal
     incinerator source which has two incinerator units, each
     unit capable of firing 40 tons of refuse per day, has a
     total firing capability at the source of 80 tons of refuse
     per day, which is more than the 50 tons per day capacity
     threshold.
     J.  Revisions to  51.161
          Several States have asked whether the public
     participation requirements for minor NSR as codified at
      51.160-161 would also meet the title V public
     participation requirements set forth in today's proposal.  
     For the reasons subsequently described, EPA believes that
     they would.  Today's proposed part 70 permit revision
     procedures are intended to meet the requirements of section
     502(b)(6) of the Act that such procedures be adequate,
     streamlined, and reasonable.  The proposal presumes that the
     public participation process required for specified types of
     minor NSR changes by the regulations governing those changes
     is sufficient for title V purposes as well.
          Application of public participation procedures to new
     and modified sources under minor NSR programs must be
     consistent with the statutory and regulatory purposes of
     those programs, and EPA believes that tailoring this
     application to the environmental significance of new or
     modified sources on a categorical or individual basis is
     consistent with these purposes.  To demonstrate this, the
     purposes of minor NSR programs are set forth below, followed
     by a discussion of the tailoring issue.
          Section 110(a)(2)(C) of the Act requires every SIP to
     "include a program for the . . . regulation of the
     modification and construction of any stationary source
     within the areas covered by the plan as necessary to assure
     that national ambient air quality standards are achieved." 
     The EPA's regulations now codified at  51.160-164 have
     since the early 1970s required a NSR program, and one is
     included in every SIP.  This requirement predates and is
     separate from the requirement also set forth in section
     110(a)(2)(C) (as well as  165(a)(1) and 172(a)(5)) that
     States have "major" NSR permitting programs under part C
     (PSD) and part D (nonattainment NSR) of title I.
          In their early years, the original NSR programs served
     primarily as a means to insure that new source growth would
     be consistent with maintenance of the NAAQS.  In response to
     a lawsuit challenging the adequacy of the original round of
     SIP's approved by EPA in 1972, EPA determined that the
     original NSR program and other SIP measures were inadequate
     to maintain air quality.  Consequently, EPA expanded the NSR
     regulations in 1973 to require public participation and to
     require that States explain the basis for any exemptions
     from the program (38 FR 15834, 15836 (1973) (citing NRDC v.
     EPA, No. 72-1522 (D.C. Cir.)); 38 FR 6279 (1973)).  The 1973
     regulations are substantively unchanged today.  They do not
     on their face distinguish between major and minor sources,
     nor did the Clean Air Act prior to 1977.
          With the adoption in the 1977 Amendments of parts C and
     D applicable to "major" new and modified sources, Congress
     created significant economic incentives for sources to take
     steps to be classified as minor and therefore avoid these
     more stringent major source requirements.  Consequently,
     after 1977, a principal focus of States' pre-existing (now
     referred to as "minor") NSR programs became the use of
     limitations on hours of operation and rates of production,
     short-term emission limits, and (following the decision in
     Alabama Power Co. v. Costle, 636 F.2d 323 (D.C. Cir. 1979))
     pollution control equipment that restricted sources'
     potential to emit to levels below applicable major source
     thresholds.  Different terms are used to describe the
     various forms that these restrictions can take.  Since by
     definition a major new or modified source that fails to
     undergo NSR under part C or D would threaten the achievement
     of air quality goals, a "necessary" purpose of minor NSR
     programs that are used as a federally-enforceable mechanism
     to avoid major status is that they function in a way that
     reasonably assures that synthetic minor sources and netting
     transactions will in fact restrict potential to emit to
     minor source levels.
          Section 51.160(e) requires States in their NSR programs
     to identify types and sizes of facilities, buildings,
     structures, or installations which will be subject to
     preconstruction review, and requires the State to discuss in
     its SIP submission the basis for that determination of the
     program scope.  States may exempt from minor NSR those
     changes that are not environmentally significant, consistent
     with the de minimis exemption criteria set forth in Alabama
     Power.  Given their environmental significance, however, EPA
     believes that it is unlikely that synthetic minor sources
     and netting transactions could qualify as de minimis
     changes.  Since States may exempt de minimis changes from
     minor NSR altogether, it follows that they may provide a
     partial or full exemption from the full public process
     requirements of  51.160(e), consistent with the
     environmental significance of the change.
          As previously explained, the statutory purposes of
     section 502(b)(6) are met with respect to changes reviewed
     by State programs governed by Federal regulations by
     compliance with the procedural requirements set forth in
     those regulations.  For minor NSR, that means compliance
     with the regulations at  51.160-161.  For the reasons
     stated above, EPA believes that the NSR regulations allow
     the tailoring of public participation process as envisioned
     by today's proposal for less environmentally significant
     changes, consistent with de minimis exemption criteria. 
     Thus, procedural requirements for less environmentally
     significant changes can be the same for minor NSR and
     part 70 programs, allowing their consolidation.  Of course,
     tailoring of process under either program must be reasonable
     and adequate for the purpose of the program.
          To codify these understandings, EPA proposes to revise
      51.161 to reserve its current 30-day public notice and
     comment requirements for any construction or modification
     that is subject to major NSR or section 112(g) and for any
     minor NSR action (including establishment of a PAL) that
     would allow a part 70 source to net out of major NSR.  A new
     paragraph (c) consistent with  70.7(e)(2)(vi) is proposed
     at  51.161 to clarify that, for other minor NSR
     transactions at part 70 sources, the permitting authority
     may match the public participation process to the
     environmental significance of the changes.
          As discussed earlier in this notice, certain minor NSR
     actions are more environmentally significant because they
     allow a part 70 source to net-out of major NSR controls. 
     They thus warrant a 30-day prior opportunity for public
     comment.  Other minor NSR actions create synthetic minor
     sources or modifications which also have the effect of
     shielding the source or modification from major NSR
     controls.  Actions creating synthetic minors can be
     environmentally significant, and States must consider the
     factors discussed earlier in identifying those types of
     synthetic minors that present greater risks of potentially
     allowing emission increases in excess of major source or
     modification thresholds.  For these actions, a substantial
     opportunity for prior public participation is warranted. 
     Other types of synthetic minors may be relatively less
     significant and a lesser degree of public participation
     would be acceptable.  The permitting authority may also
     designate certain categories of changes, subject to EPA
     approval, as de minimis based upon its determination
     approved by EPA that meets the test prescribed by the
     Alabama power case.  For these categories of changes, the
     State may forego altogether prior review by the public and
     EPA.
          Paragraph (d) of  51.161 is proposed to require
     availability of the public notice, rather than copies, to be
     provided to EPA and affected States.  This change is
     intended to allow the permitting authority the opportunity
     to provide the required information through other avenues
     such as computer bulletin boards instead of solely by hard
     copy.
          A new  51.161(e) would be added to confirm that a
     State could, as needed to meet the public participation
     requirements for minor NSR changes at part 70 sources,
     either revise its NSR or part 70 program to include those
     provisions.
          In addition, today's proposal would delete an obsolete
     grandfathering provision at  51.161(c) applicable in
     limited circumstances.  It enabled States to adopt a comment
     period shorter than would otherwise be required to be
     consistent with requirements in State programs for acting on
     requests for permission to construct.  That provision was
     adopted in 1973 to avoid undue disruption to existing State
     programs.  The EPA is not aware of any State program that
     currently falls within the scope of the grandfathering
     provision.  Beyond that, given the changed purposes of minor
     NSR programs since that time and the flexibility under
     today's proposal to enable States to match public process
     with environmental significance, including the use of public
     comment periods less than 30 days where appropriate, EPA
     believes it is no longer necessary or appropriate to retain
     this grandfathering provision.
          Finally, a new  51.160(e) clarifies that all of the
     terms used in  51.160 - 164 have the same meaning as
     provided elsewhere in subpart I of part 51, or in the Act. 
     None of the terms in these sections have meanings different
     from those used in other sections of the NSR regulations or
     in the Act, and it is simpler to clarify this through a
     single cross-referencing provision rather than to repeat
     those terms here.
     K.  Incorporation of MACT Standards
           The EPA proposed in the August 1994 notice to allow
     States to incorporate MACT standards into operating permits
     using a 2-step process.  The first step provided for
     administrative incorporation of certain conditions into the
     permit at the time a source submits the initial notification
     that it is subject to the MACT standard.  These conditions
     would outline the steps which the source would take to
     demonstrate compliance with the MACT standard.  In the case
     of newly issued MACT standards, this first step would be in
     lieu of the reopening procedures otherwise applicable, which
     require full public and EPA review.  The second step would
     require use of the proposed minor permit revision procedures
     to define final compliance parameter limits and unit
     applicability decisions, unless the source chose options
     such as emissions averaging, in which case significant
     permit revision procedures would be required.
          Today's proposal would provide an analogous system but
     would afford States more discretion in providing adequate
     process for the second step of MACT incorporation.  The
     first step of incorporating the MACT compliance plan could
     occur upon the permitting authority's receipt of a notice
     from the source that the source is subject to the MACT
     standard.  The second step of defining source-specific
     compliance details would occur through the permit revision
     process for changes that do not undergo a State review
     program.  As described previously, States would have broad
     discretion to determine the process for such changes which
     do not meet the proposed definition of more environmentally
     significant changes.  The EPA is proposing not to include
     decisions regarding MACT compliance terms in the more
     environmentally significant category; States would thus have
     flexibility in providing process for these determinations in
     conjunction with State review programs, if the State so
     desires.
          At the same time, as the author of MACT standards, EPA
     is in a particularly good position to judge the extent to
     which it would be appropriate to provide for public
     participation in decisionmaking about particular MACT
     compliance terms.  The Agency thus expects to provide
     guidance to States in this regard, probably in the context
     of promulgating the MACT standards themselves.  As a general
     matter, though, States should provide more public process
     for decisions regarding MACT compliance terms that entail
     the exercise of substantial discretion or judgment by the
     permitting authority or that could have a large impact on
     allowable emissions.  Emissions averaging customized to the
     source, for example, should be subject to a substantial
     opportunity for prior public review.
          It should be noted that not all MACT standards will
     require a two-step process for incorporating them into
     part 70 permits.  As explained earlier in this notice, for
     MACT standards whose application does not vary from source
     to source in any significant way, the State may provide for
     incorporation without any permitting authority or public
     review.
          If EPA adopts this proposed approach in the final
     part 70 rule, States will be faced with a transition period
     during which State rules adopted pursuant to the current EPA
     rule require reopening using the same process as required
     for issuance of the initial permit.  At this same time, the
     State would be in the process of developing and submitting
     for EPA approval a revision to their part 70 program
     responding to the revised EPA rule which would allow for a
     more streamlined process.  Some States have requested EPA to
     allow States to use the more streamlined 2-step process for
     incorporating MACT standards during this transition period.
          In response, EPA solicits comment on whether permits
     could be issued containing standard conditions pertaining to
     specific MACT standards in such a way as to avoid the first
     step of reopening.  Under this approach, a permit issued
     prior to promulgation of a MACT standard would contain the
     conditions which outline the steps a source must take to
     demonstrate compliance (i.e., step one conditions) with the
     MACT standard promulgated subsequently.  That is, analogous
     to the first of the two steps proposed on August 29, 1994
     for incorporating MACT standards, the requisite compliance
     schedule would be initially established in the permit.
          The EPA recognizes that for this approach to work, a
     minimum amount of information would need to be known at the
     time of permit issuance.  Enough information would need to
     be known to satisfy the requirements of  70.7(e)(5) of the
     August 1994 proposal.  Those requirements include a
     statement of whether the section 112 requirement is an
     applicable requirement, a schedule of compliance, a
     requirement to submit reports required under the standard,
     and a requirement to apply for a subsequent permit revision
     by the deadline for the compliance statement under the MACT
     standard.  To the extent these permit conditions can be
     expressed as standard conditions (e.g., "compliance shall be
     achieved no later than 3 years after promulgation of the
     section 112 standard"), this approach may eliminate the need
     to revise the permit before the second step in the proposed
     MACT incorporation process.  The EPA solicits comments,
     especially from States, as to whether such an approach would
     be effective in addressing their transition concerns and how
     it could best be implemented.  In addition, the Agency
     solicits comment on the legal ability for States to issue
     such standard conditions before undergoing a rule adoption
     and/or delegation process to acquire any necessary
     additional legal authority.
     L.  Clarification for Section 112(r)
          On March 13, 1995, EPA published a supplemental
     proposal on the requirements of section 112(r) of the Act,
     including how these requirements would be implemented in
     title V permits.  In part, the proposal set forth standard
     part 70 permit conditions concerning the development and
     implementation of the risk management plan required under
     section 112(r)(7).  The EPA indicated in the March 13 notice
     that permits issued with such conditions would satisfy the
     part 70 requirement to "assure compliance" with all
     applicable requirements.
          During development of that proposal, several States
     commented that EPA should propose a narrower definition of
     the term "applicable requirement" in part 70.  This
     suggestion was intended to reduce potential liabilities of
     permitting authorities and sources that might result from a
     more expansive reading of part 70 to require more with
     respect to permit content than that required under proposed
     40 CFR part 68 to implement section 112(r).
          In considering these comments, EPA recognizes the need
     to clarify part 70 to limit the potential for reading in
     unintended requirements.  The Agency therefore proposes to
     add a paragraph (iv) to  70.6(a)(1), which would state:
     "(W)ith respect to applicable requirements under section
     112(r)(7) of the Act, the inclusion of permit conditions in
     accordance with regulations promulgated under section 112(r)
     shall satisfy the requirements of paragraph (a)(1) of this
     section."  This would clarify that permits containing the
     standard permit conditions that EPA expects to promulgate
     under part 68 would be considered in compliance with the
     requirements of  70.6(a)(1), and that no other obligations
     on the source or the permitting authority with respect to
     requirements of 112(r) are to be implied from this language
     of part 70.
          The August 1994 proposal responded to various concerns
     over the relevance of section 112(r) to the part 70 program
     by proposing a change to  70.3(a).  That proposal would
     have provided that a source would be exempted from the
     requirement to obtain a part 70 permit if it would be
     classified as major solely on the basis of its emissions of
     a section 112(r) pollutant.  Based on the public comment and
     further analysis of this issue, EPA is today proposing a
     revision to the definition of "regulated air pollutant"
     contained in  70.2 that deletes being listed pursuant to
     section 112(r) as a criterion for conferring the status of
     regulated air pollutant.  This action should be more
     effective in meeting the goals of the proposal, while being
     more consistent with the general applicability structure of
     title V.
          Because of its central role in Act implementation, the
     title V program addresses a wide range of air pollutants
     regulated by the programs within the Act.  For example, in
     rewriting section 112, the 1990 Act amendments assign the
     title V permit program a key implementation role. 
     Accordingly, the definition of regulated air pollutant,
     which governs some core program functions such as which
     pollutant emissions are addressed by the permit application,
     is an important one.  With these goals in mind, EPA
     promulgated a definition of regulated air pollutant that
     encompassed all pollutants regulated under section 112,
     including substances listed pursuant to section 112(r).
          The section 112(r) program governs the prevention of
     accidental releases, and had no predecessor in the Act. 
     Although this program does not expressly apply to the
     routine emissions of air pollutants, EPA elected not to
     prejudge its relevance to air quality management issues. 
     Accordingly, EPA promulgated a definition of regulated air
     pollutant that included the substances listed pursuant to
     section 112(r)(3).  It should be noted that
     section 112(r)(3), in mandating that EPA develop this list
     of substances, specified several compounds for inclusion on
     this list.  Most of these substances are pollutants that
     could be of concern to air quality management programs at
     some time and several of them are also classified as HAPs
     pursuant to section 112(b).
          Since that time, EPA has proceeded with developing the
     section 112(r) program requirements, such as the risk
     management plan provisions of section 112(r)(7).  The EPA
     has also promulgated a considerable list of substances
     pursuant to section 112(r)(3), including the explosive
     substances listed by the Department of Transportation as
     Division 1.1 in 49 CFR 172.101.  Although this list includes
     a wide range of substances, some of which might eventually
     be addressed by air pollution control requirements, the list
     contains many other substances.  Examples of the latter
     group include dynamite and nuclear warheads; substances of
     obvious interest to the risk management program, but equally
     obviously not an aspect of air quality management programs. 
     The development of the section 112(r) risk management
     program confirms that the focus of this program is not the
     regulation of "emissions" of "air pollutants" and that its
     requirements, although important to public safety, are not
     significantly relevant to the broader issues of air quality
     management.
          Some significant benefits arise from today's action. 
     Because the section 112(r) pollutants at issue are generally
     not subject to air pollution control program requirements,
     there is only limited expertise available for evaluating
     their emissions from industrial facilities.  Several parties
     have expressed concern that it would be quite difficult,
     technically, for businesses to meet the part 70 requirement
     that permit applicants describe their emissions of the
     section 112(r) pollutants.  As a result of today's proposal,
     permit applicants would no longer be required to consider
     the broad class of substances listed pursuant to
     section 112(r) in preparing their emissions estimations.  It
     should also be noted that this action is consistent with the
     section 112(r)(7)(f) provision that sources not be made
     subject to the requirement to apply for a part 70 permit
     solely because they are subject to section 112(r).
          The following points should be understood in
     implementing this provision.  First, it must be stressed
     that this action would solely address how part 70
     requirements are implemented; it would in no way affect
     section 112(r) program provisions or the fact that
     section 112(r) is an applicable requirement of the Act for
     part 70 purposes.  Second, because today's action means that
     the listing of a substance pursuant to section 112(r) would
     no longer have any relevance to the definition of regulated
     air pollutant, it should be clear that the inclusion of a
     pollutant on the section 112(r) list in no way affects the
     status of a pollutant that is classified as a regulated air
     pollutant because of its regulation pursuant to other
     programs.  Finally, today's action does not affect the
     approvability or continuing adequacy of State part 70 permit
     fee programs.
     M.  Solicitation of Input
          The Agency solicits comment on all aspects of today's
     proposal to accomplish permit revisions in a streamlined and
     more efficient manner.  It is also interested in receiving
     comment on the final structure of the regulatory revisions
     and how they might be improved and/or how States might
     develop substantially equivalent provisions.
     
     III.  Part 70 Program Revisions
          Title V and the current rule require States and local
     agencies to submit operating permit programs for EPA
     approval by November 15, 1993.  This deadline has not
     changed and is not affected by the Agency's proposals to
     revise part 70.  Most States and local agencies have
     submitted programs for approval, and EPA has proposed or
     taken final action on many of them.  Until EPA promulgates
     final part 70 revisions, State program development and EPA
     approval will continue to be governed by the current rule. 
     States that have yet to submit a program or receive program
     approval should thus be aware that their programs will be
     judged against the current rule until the revised rule is in
     place.  As EPA explained in the August 1994 proposal, the
     Agency intends to provide a transition period following the
     promulgation of the part 70 revisions during which States
     may choose which rule EPA is to apply in reviewing the State
     program, the originally promulgated rule or the rule as
     revised.
          Once EPA promulgates final part 70 revisions, States
     that receive program approval under the originally
     promulgated rule will be required to revise their programs
     as needed to comply with the revised rule.  Under the
     current rule, States have at least 180 days from EPA's
     promulgation to make conforming changes to their programs or
     as much as 2 years if State legislation is needed to
     authorize the changes.  At the same time, many State
     programs are being approved on an interim basis under the
     current rule.  Title V and the current rule authorize EPA to
     grant a State program interim approval if it largely, but
     not entirely, meets the requirements for full approval. 
     Under the statute and rule, however, States receiving
     interim approval must revise their programs as needed in
     time to gain full approval within 2 years of receiving
     interim approval.  Consequently, States that receive interim
     approval may be faced with having to undertake two rounds of
     program revisions, the first to gain full approval and the
     second to comply with a revised part 70.
          Depending on when it receives interim approval and when
     EPA promulgates final part 70 revisions, a State may be able
     to revise its program by means of a single rulemaking in the
     time frames allowed by the current rule.  The Agency is very
     concerned, however, that the timing of these events for many
     and even most States will not be so fortuitous, consigning
     States to multiple rounds of rulemaking.  More generally,
     EPA wants to minimize the potential disruption to State
     programs that rule revisions cause.  The Agency is thus
     proposing to provide more time for States to submit program
     revisions.  The Agency is also interested in extending the
     time period under which States may operate programs that
     have received interim approval to enable all States to
     revise their part 70 programs once instead of twice.
          As noted above, the current rule calls for State
     program revisions in response to EPA rule revisions within
     specified time frames that vary according to whether State
     legislation is required.  The Agency then has up to 1 year
     to approve States' submissions.  The August 1994 notice
     proposed to revise  70.4(i) of the current rule to specify
     that States would have 12 months to revise their programs if
     regulatory changes were needed.  It further proposed to
     allow the Administrator to vary the time period provided for
     State program revisions as the Administrator deemed
     appropriate (proposed  70.4(i)(1)(iv)).
          The Agency is today proposing to exercise its
     discretion under proposed  70.4(i)(1)(iv) to provide States
     2 years to submit program revisions in response to the
     proposed part 70 revisions, regardless of whether State
     regulatory or legislative changes are required.  The Agency
     believes this would be an appropriate exercise of its
     discretion in light of the fact that these part 70 revisions
     will be promulgated in the beginning years of most State
     part 70 programs.  In these early years, the demands on
     States will be particularly heavy.  The statute and
     regulations require States to complete the task of issuing
     permits to all sources subject to the program within 3 years
     of program approval.  At the same time, States will have to
     address the many implementation issues that invariably arise
     when a new program is inaugurated.  In light of the
     challenges States already face, EPA believes it is only fair
     and appropriate to provide them with 2 full years to submit
     program revisions.
          The Agency further recognizes the possibility that some
     States may find it difficult to make all of the changes
     required by the part 70 revisions within the 2-year time
     period.  In particular, today's proposal calls for States to
     rely on State preconstruction permitting programs to provide
     public review and certain permit content provisions for
     purposes of part 70.  To the extent that these State review
     programs require supplementation to account for title V
     process and permit content requirements, EPA would allow
     States to revise either their part 70 regulations or the
     regulations governing their underlying programs.  The Agency
     is aware, however, that supplementing the process of
     existing State programs may pose additional implementation
     issues.  To minimize any disruption of underlying State
     programs EPA is proposing to amend the current rule at
      70.4(d)(3)(iv) to allow the Agency to grant interim
     approval to State program submittals even if they do not
     meet the public participation requirements of the revised
     rule with respect to changes processed pursuant to State
     review programs.
          States receiving interim approval would have an
     additional 2 years to make the changes needed to gain full
     EPA approval of their programs.  In total, States would have
     up to 5 years from promulgation of the final part 70
     revisions to put in place any additional procedures in
     conjunction with State review programs as needed to gain
     full approval of their part 70 programs (i.e., 2 years to
     submit program revisions sufficient to gain interim
     approval, 1 year for EPA to grant interim approval, and 2
     years to gain full approval).
          As previously noted, many States will have received
     interim approval of their part 70 programs under the current
     rule by the time these revisions are promulgated.  The EPA
     is concerned about the potentially adverse effects of the
     part 70 revisions on these States, particularly those which
     submitted their part 70 programs by, or close to, the
     statutory submittal date (November 15, 1993) and therefore
     received the earliest interim approvals for their programs. 
     Under the current rule, States granted interim approval for
     their programs must submit program revisions necessary to
     receive full approval at least 6 months prior to expiration
     of the interim approval.  Under section 502(g), an interim
     approval can be granted for a period not to exceed 2 years
     and cannot be extended.
          States which received the earliest interim approval may
     have less than 1 year after promulgation of the final
     part 70 revisions to develop and submit combined program
     revisions addressing both the deficiencies which caused
     interim approval as well as EPA's revisions to part 70. 
     Many States have indicated that it would be extremely
     burdensome to undertake multiple program revisions,
     especially where legislative action would be necessary. 
     Moreover, States might well be compelled to do multiple
     corrections for the same area of deficiency, once to correct
     the problem for which they received interim approval under
     the current part 70 and again to correct it in accordance
     with the revisions to part 70.  This would be a seemingly
     pointless diversion of resources which are otherwise
     critically needed to issue permits under the approved
     program in such States.  In addition, it would be confusing
     to permitting authorities, sources, and others involved in
     the implementation of the part 70 program to deal with
     "moving targets."
          One approach for providing relief would be to require
     States to correct program deficiencies identified in the
     interim approval under the current part 70 only in those
     areas which are not proposed to be revised.  That is, EPA
     would not require program revisions in areas of deficiency
     affected by the part 70 revisions, but would require them on
     the timeframe provided to respond to the part 70 revisions. 
     This would provide relief by reducing the scope of the
     corrective actions needed by the State in response to EPA's
     interim approval actions.  The relief, however, would be
     only partial to the extent that there are significant
     program deficiencies that are not affected by the part 70
     revisions.
          Instead, EPA believes that States with early interim
     approvals should be allowed more time to submit program
     correction revisions needed to receive full approval,
     regardless of what program provisions were determined to be
     deficient in the interim approval notice.  That is, these
     States should be allowed to delay the submittal of any
     program revisions to address program deficiencies previously
     listed in their notice of interim approval until the
     deadline to submit other changes required by the proposed
     revisions to part 70.  To accommodate this extension of the
     period to submit program revisions to address interim
     approval deficiencies, the duration of the interim approval
     granted to these States should be extended as necessary.
          The Agency believes that such a policy is necessary to
     avoid penalizing those States which submitted their part 70
     program on a more timely basis, while rewarding States with
     late submittals who would have considerably more time to
     synchronize their future program revisions.  In light of the
     inequities which would result, the Agency believes that
     providing such a transition period is appropriate.  The
     Agency solicits comment on the appropriate legal basis for
     granting such relief.
     
     IV.  Proposal for the Federal Operating Permits Program
     A.   Overview
          In today's notice, EPA proposes a new system for
     part 71 for revising permits which is modeled after the
     system proposed today for part 70 permit revisions.  This
     action is intended to supplement the April 27, 1995 proposal
     on part 71 regulations in this regard.  Although proposed
     regulations to implement the new system have not been
     developed, EPA proposes to promulgate regulations to
     finalize the part 71 rulemaking that are consistent with the
     concepts and procedures discussed in today's proposal.  The
     Agency believes that the subsequent discussion in today's
     preamble describes the new system with sufficient detail to
     allow the public to understand and offer informed comments
     on the proposal.
          To the extent possible, EPA intends to model part 71
     permit revision procedures after those proposed for part 70
     to ensure that sources are not faced with substantially
     different programs when EPA, as opposed to a State, is the
     permitting authority.  Since most part 71 programs are
     likely to be of limited duration, consistency with part 70
     will enable smooth transition between Federal and State
     programs, encourage States to take delegation of
     administration of part 71 programs, help States that have
     not obtained part 70 approval to phase into the title V
     program, promote uniformity in public and affected State
     participation, and provide greater certainty and consistency
     for sources.
          Following proposed part 70, today's part 71 proposal
     would establish two basic categories of changes for permit
     revision purposes.  The first category would include all
     changes that are subject to State review programs
     established pursuant to the Act which review the change for
     title V purposes as well.  Qualifying changes would be
     automatically incorporated into a title V permit (i.e., a
     part 70 or part 71 permit, as applicable) under a part 71
     program upon completion of that review.  The second category
     would include all other changes that are not subject to
     State review programs, and today's proposal describes a
     part 71 permit review process for these changes.
     B.   Changes Subject to State Review Programs
          Applicability.  As in the case of the part 70 program,
     today's proposal notice for revising part 71 permits builds
     on existing State review programs to provide for automatic
     incorporation into part 71 permits for all changes subject
     to the State review program which are also evaluated for
     title V purposes in this review.  There are two criteria for
     a change to qualify.  The first is that the State permitting
     authority must have reviewed the change and provided an
     adequate opportunity for public participation and affected
     State and EPA review commensurate with the environmental
     significance of the change (see footnote number 1).  For the
     more environmentally significant changes as defined under
     proposed part 70 (i.e., major NSR, 112(g), and net-outs) a
     30-day prior public comment period and a 45-day opportunity
     for EPA review and objection must be required in the State
     review process for it to qualify.  If a State review program
     did not provide a 30-day public review period or an adequate
     EPA review opportunity for these changes, EPA (or the
     delegate agency) would provide them as needed in a part 71
     process as the part 71 permitting authority before issuing
     the part 71 permit.
          Under part 70, EPA would give a State discretion, for
     the less environmentally significant changes, to match the
     amount of public review to the environmental significance of
     the change.  Under today's proposal for part 71, EPA would
     accept the amount and timing of public process under the
     State's current NSR program, at least during the first 5
     years following the effective date of a part 71 program in a
     State.  The EPA expects no part 71 programs for States to
     last for more than this time duration.  This approach is
     consistent with EPA's approach for reviewing minor NSR
     programs set forth in today's part 70 proposal.  Under
     part 70, a State would be given interim approval even if its
     program did not meet the public participation requirements
     of the proposed part 70 for changes subject to State review
     programs (see section III of today's preamble).
          The second criterion for inclusion in the first
     category requires that the change subject to the State
     review process would need to address the permit content
     requirements of proposed  71.6.  The EPA believes that many
     of these requirements could be included in the original
     title V permit as boilerplate or standard conditions, and
     would not require much additional effort to address part 71
     permit content requirements for subsequent permit revisions. 
     For example, the existing title V permit would already
     contain requirements regarding permit fees, periodic
     reporting, annual certification, and inspection and entry. 
     If the existing title V permit ensures that these
     boilerplate conditions apply to the requirements attached to
     the permit (e.g., the revised NSR permit or 112(g)
     determination), it would not be necessary to revisit these
     requirements when the title V permit is revised.
          Consistent with these criteria, the first category of
     changes would include changes that are subject to major or
     minor NSR or regulations implementing section 112(g) and
     changes that entail a source-specific revision of the SIP.
          The Agency is also proposing that certain changes
     subject to a State review program could qualify even though
     they do not receive prior permitting authority review and
     approval.  Under some State minor NSR programs, for examle,
     not all changes subject to minor NSR requirements get case-
     by-case State review and approval.  Instead, some types of
     changes are subject to general rules, and the source may
     make such a change without prior State approval so long as
     it complies with the applicable requirements (i.e., the
     general rules).  These changes would still be included in
     the first category.
          As set forth under proposed  70.7(e)(2)(viii), EPA is
     proposing that such requirements, when triggered by a change
     that is subject to specified requirements, but is not
     required to receive affirmative State approval under the
     State's review program, be included in the first category
     (i.e., changes subject to a State review program) for
     part 71 purposes and get the benefit of an automatic
     incorporation process (see Section II. C. of this preamble). 
     Eligible requirements would be those that do not conflict
     with the existing title V permit, do not require
     interpretation as to applicability, and do not require
     creation of source-specific permit terms or conditions. 
     These would include general rules or general permits.  The
     justification for automatic incorporation of these types of
     requirements is the same as under part 70 (i.e., their
     application is so straightforward that little is to be
     gained from additional process).
          Any change which was subject to a State review process
     which was inadequate from a title V standpoint must be
     processed as a minor or significant permit revision (see
     discussion below), depending on the environmental
     significance of the change.  More environmentally
     significant changes require the significant permit revision
     process while less environmentally significant changes could
     be processed as minor permit revisions.  The Agency,
     however, is concerned that parts of the prior State review
     process in some circumstances might unnecessarily be
     repeated under such an approach and solicits comment on how
     the part 71 permit revision process might be authorized to
     add only the elements missing from the State review process,
     rather than repeat all the elements of the prior State
     review process.
          Automatic Incorporation Process.  All changes that are
     subject to a qualifying State review program (except for
     those qualifying under a general rule approach), the part 71
     permitting authority (either EPA or the delegate agency)
     would automatically incorporate the change into the title V
     permit immediately on completion of the State review
     process.  The source could operate the change upon
     completion of the State review process and the automatic
     incorporation.  As proposed today for part 70, EPA would
     similarly waive for part 71 purposes its objection
     opportunity for less environmentally significant changes
     subject to State review programs for at least 5 years.
          To accomplish the permit revision, the permitting
     authority would not generate a new permit but would attach
     the document from the State review process, such as the
     revised NSR permit or the 112(g) MACT determination, to the
     existing title V permit.  This process could be used
     provided all of the applicable requirements triggered by the
     change were addressed in the document attached to the
     permit.
          For part 71, the permitting authority would use the
     same procedure for incorporating the results of the State
     review process into the title V permit as States would use
     under today's proposal for part 70.  Since a new title V
     permit would not be issued under this process, the
     permitting authority would prepare an errata sheet
     identifying which terms of the title V permit were being
     replaced by which terms of the State permit or which terms
     were being removed as no longer relevant.
          Where the change involved adding new applicable
     requirements to the title V permit, but did not require
     changing existing terms or conditions of the permit, the
     permit revision would be accomplished by attaching to a
     source's title V permit a copy of the State preconstruction
     permit or section 112(g) determination or the documentation
     containing the new requirement and permit terms that reflect
     the change.
          Process for Incorporating Changes Subject to General
     Rules.  As in the case of proposed part 70, for changes
     regulated by a State review program through a general rule,
     the source would submit a notice describing the change and
     the applicable requirements that attach as a result of the
     change.  As part of the notice, the source would have to
     certify that it could operate the change without violating
     any existing permit terms and supply any additional permit
     terms required by title V (i.e., periodic reporting
     requirements).  The title V permit would be revised and the
     source could operate the change upon submitting the notice.
     C.   Changes Not Subject To State Review Programs
          Under today's proposal, the second basic category of
     changes for permit revision purposes includes all changes
     not subject to adequate State review programs.
          Notice-and-Go.  Part 71 would follow part 70 in
     proposing that changes that render a source subject to a
     newly applicable requirement but that are not subject to a
     State review program could be incorporated into the title V
     permit by means of a notice submitted by the permittee,
     provided that the change would not conflict with existing
     permit terms and no source-specific determination would need
     to be made in applying the requirement to the source.  The
     justification for automatic incorporation of such revisions
     is the same as for part 70.  The new applicable requirements
     to which these changes are subject should not require any
     interpretation regarding the applicability of the new
     requirements, or any case-by-case determination of source-
     specific permit terms or conditions.  When EPA implements a
     part 71 program in a State, it will work with the State to
     determine which requirements for which changes can qualify
     for the notice-and-go procedure.  For each such State, EPA
     will publish an informational notice that communicates to
     the regulated community and the general public the outcome
     of the EPA/State discussions.  During implementation of the
     part 71 program, as States would do for part 70, EPA would
     provide quarterly notification to the public of such permit
     revisions and would provide a file accessible to the public
     containing information about the revisions.
          In light of the general eligibility criteria described
     above, the EPA expects that many types of changes could be
     eligible for incorporation into the title V permit by means
     of a notice.  Applicability of most NSPS and national
     emission standards for hazardous air pollutants (NESHAP)
     requirements, such as the application of a numerical
     emission limit to a boiler, would be straightforward and
     thus would be eligible.  Many straightforward SIP
     requirements, such as source category-specific RACT
     requirements, would be eligible.  Generically  applicable
     requirements (e.g., those that apply identically to all
     units at a source such as opacity limits), would also be
     eligible for incorporation via this process, although a
     permit revision may not be necessary at all to apply such a
     requirement if such requirements are already addressed in
     the source's permit and apply prospectively to all future
     changes that would be subject to the requirement.  The EPA
     may also determine that certain MACT standards are eligible
     for this process if they do not require the establishment of
     source-specific requirements (e.g., emissions averaging or
     setting of compliance parameters).  Incorporation of MACT
     compliance schedules would also be eligible.
          Finally, as provided in part 70, part 71 would provide
     that the source may operate the change upon mailing a
     notice, provided that the change can be operated in
     compliance with the existing title V permit.  In the notice,
     the source would describe the change, describe any new
     permit terms needed to assure compliance with all applicable
     requirements and relevant part 71 requirements, and certify
     that the change is eligible for this process.  The title V
     permit would be revised upon mailing of the notice to EPA.
          Similarly, EPA would adopt provisions like that in
     proposed  70.7(f)(2)(v)(A)(1)-(5) and (B).  Thus, part 71
     would provide that the source may operate certain
     administrative changes upon mailing a notice, provided that
     the change can be operated in compliance with the existing
     title V permit.  These changes described in proposed
      70.7(f)(2)(v)(A)(1)-(5) include correcting typographical
     errors, allowing for certain changes in ownership or
     operational control of a source, and making minor
     administrative changes.  The proposed procedures of
      70.7(f)(2)(v)(B) would also be used in part 71 allowing
     either the permitting authority or the source to revise the
     title V permit by issuing a notice.
          Significant Permit Revisions.  Changes not subject to
     State review programs and that are more environmentally
     significant as defined under  70.7(f)(1) of today's part 70
     proposal would be processed as significant permit revisions. 
     The significant permit revision process would also be used
     if a more environmentally significant change subject to a
     State review program was not eligible for automatic
     incorporation (i.e., the change had not previously been
     subject to an adequate opportunity for public comment and a
     public hearing, affected State review, and EPA review or the
     part 71 permit content requirements had not been adequately
     addressed by a State review program).
          The significant permit revision process would utilize
     the same procedures as required for initial permit issuance,
     i.e., an opportunity for public comment and a public
     hearing, review by affected States, and review by EPA (for
     delegated programs).  Under part 71, a majority of these
     significant permit revisions would be completed within 6
     months.  The EPA expects that if the change had undergone a
     State review process that provided adequate input from the
     public, affected States, and EPA with respect to
     preconstruction requirements, but the preconstruction permit
     failed to appropriately address part 71 content
     requirements, then the permitting authority could in several
     instances process the part 71 permit revision in a much
     shorter timeframe than 6 months.
          Part 71 Process for Other Less Environmentally
     Significant Changes.  The EPA is not today proposing any
     specific part 71 permit revision process for less
     environmentally significant changes (as defined in today's
     proposed part 70) which do not qualify for notice-and-go
     treatment.  The types of changes which represent this group
     are defined in proposed  70.7(f)(1)(ii).  With the possible
     exception of intra-monitoring approach changes, EPA does not
     expect the number of changes from this group to be
     significant, particularly in light of frequent options to
     combine such changes (see following discussion).  The
     Agency, however, does solicit comment on the need to provide
     for a more expeditious permit revision procedure than the
     significant permit revision process to address less
     environmentally significant changes which do not qualify for
     notice-and-go or automatic incorporation.  Where commenters
     do believe such a need exists, EPA solicits their
     suggestions for designing any appropriate change to the
     proposed permit revision system for part 71.
     D.  Combination Changes
          "Combination changes" under part 71 would be handled
     the same way as EPA proposes to handle them for part 70 (see
     proposed  70.7(f)(3)).  The general rule would be that a
     combination change can be processed using the process for
     automatic incorporation of changes subject to State review
     programs, provided the change receives any necessary public,
     affected State, and EPA review in the State review process
     and address all part 71 permit content requirements.  For
     example, where an emissions increase is subject to minor
     NSR, but the source also wants to incorporate a PAL into the
     title V permit, the change could be automatically
     incorporated into the title V permit after undergoing review
     under the State's minor NSR program, provided the State
     review process meets the procedural requirements applicable
     to the establishment of a PAL (i.e., a 30-day opportunity
     for prior public, affected State, and EPA review).  This
     review may be provided on a permit-by-permit basis.  In
     addition, where a State takes delegation of a part 71
     program, it could process minor NSR changes and section
     112(g) or (j) actions as combination changes.  The Agency
     believes this is appropriate because upon delegation of a
     part 71 program, delegate States should also be able to
     receive delegation to implement sections 112(g) and (j),
     provided they have adequate authority under State law to do
     so.
     E.   Opportunity for EPA to Object and Permit Shield
          The opportunity for EPA review of proposed title V
     permit revisions and the corresponding availability of the
     permit shield will vary with the part 71 permit revision
     procedure employed and will partially depend on whether EPA
     or the State is the part 71 permitting authority.  In
     general, the permit shield may be granted by the part 71
     permitting authority if the permit revision is approved
     pursuant to a process which affords an adequate opportunity
     for public and affected State review and for EPA to object
     to the issuance of the permit revision.  The scope of EPA's
     review where provided would be the same as under today's
     proposal for part 70, i.e., such review would extend to
     whether the appropriate procedures were followed with
     respect to the State review process determination or
     delegate agency permitting decision (including requirements
     for public participation opportunities), whether the
     decision is properly supported, and whether the terms of the
     permit are enforceable and consistent with all applicable
     requirements.
          Delegated Programs.  For changes not subject to an
     adequate State review program which must be processed as
     either significant or minor permit revisions, EPA proposes
     to continue the requirement in  71.10 of the April 27, 1995
     notice that EPA be given a 45-day opportunity to object
     before issuance of the part 71 permit revision.  Since both
     the proposed significant permit revision and the minor
     permit revision procedures contain adequate public
     participation and EPA review requirements, EPA believes that
     the part 71 permitting authority may in such cases grant a
     permit shield to apply to the changes.  On the other hand,
     changes which qualify for a "notice and go" process would
     not contain review procedures sufficient to warrant the
     availability of the permit shield prior to permit renewal,
     at which point adequate public and EPA review opportunities
     would be provided for such changes.
          More environmentally significant changes which are
     subject to a State review program which reviews these
     changes for title V purposes as well could be awarded the
     permit shield upon their automatic incorporation into the
     title V permit.  As previously mentioned, EPA and the public
     must have been provided their review opportunity to review
     the adequacy of the change (including adequacy for title V
     purposes) in the State review process.  For less
     environmentally significant changes subject to a State
     review program, EPA would depart from its April 27, 1995
     proposal and follow today's proposed revisions for part 70
     by not including an EPA review and objection opportunity for
     at least the first 5 years of the part 71 program for a
     particular State.  Consequently, no permit shield would be
     available for the automatic incorporation of these changes. 
     However, the part 71 permitting authority could at the
     source's request process the change as a minor permit
     revision, thus subjecting the change to public and EPA
     review, in order to establish a shield.
          Non-Delegated Programs.  For all changes not subject to
     a State review program and therefore processed by EPA under
     the minor or significant permit revision procedures, the
     Agency would have the option of granting the permit shield. 
     Again, changes subject to a notice and go process with its
     abbreviated review procedures would not afford EPA the
     opportunity to grant a permit shield.
          For changes subject to an adequate State review program
     which also reviews the changes for title V purposes, the
     preceding discussion regarding the availability of the
     permit shield under delegated part 71 programs would also
     apply (i.e., the permit shield is available for more
     environmentally significant changes).  Where granted, EPA
     would incorporate the permit shield upon the automatic
     incorporation of the State review document addressing the
     approved change.
          The EPA solicits comment on whether the revision
     processes outlined above are adequate and generally
     compatible with proposed part 70 and existing State permit
     revision procedures.
     F.  Other Part 71 Changes
          For purposes of the part 71 program, EPA proposes to
     follow the approach of today's proposal for part 70 with
     respect to the definition of major source.  For example,
     part 71 would take the same approach as part 70 with respect
     to non-major R&D activities at major sources (see discussion
     in Section V. A. of this preamble).  The EPA believes that
     it is important to use a consistent definition of "major
     source" to assure that R&D facilities are not faced with
     substantially different applicability requirements when EPA
     is the permitting authority.  The EPA also proposes for
     part 71 that the definition of "major source" would require
     that fugitive emissions be included in determining major
     source applicability consistent with the definition proposed
     today for part 70.
          Also for purposes of part 71, EPA proposes to provide
     an emergency defense for exceedances of technology-based
     limits established in title V permits as described in
     Section V. B. of this preamble, but does not intend to
     expand the concept of emergency defense to include start-up,
     shut-down, and preventive maintenance conditions.  The EPA
     solicits comment on the proper scope of the affirmative
     defense provided by part 71.  Also, EPA solicits comment on
     whether part 71 should authorize permitting authorities to
     grant a source temporary authorization to make a change
     without revising the permit, as needed to protect public
     health or welfare in emergencies, and whether part 71 should
     adopt the same approach as part 70 adopts regarding the
     scope, terms, and procedural safeguards for such
     authorization.  Finally, EPA proposes to adopt for the
     part 71 program the standard certification language that is
     proposed for part 70 (discussed in Section V. C. of this
     preamble) to be used by responsible officials.  The Agency
     believes that the same standard for preparing certifications
     should apply to the part 70 and part 71 programs.
          With respect to the treatment of section 112(r)
     pollutants, part 71 would follow today's proposal for
     part 70.  Accordingly, the definition of "regulated air
     pollutant" would be revised to delete the reference to
     section 112(r).  Further, EPA would add a paragraph
     analogous to proposed  70.6(a)(1)(iv) to clarify that
     part 71 permits containing the standard permit conditions
     that EPA expects to promulgate under part 68 would be
     considered in compliance with the requirement that permits
     contain terms that assure compliance with all applicable
     requirements.  In addition, consistent with EPA's current
     interpretation of title I modification, (discussed at length
     in Section II. H. of this preamble), EPA intends to
     promulgate the definition of title I modification as
     proposed in the April 27, 1995 Federal Register except that
     the definition would not include the reference to section
     110(a)(2) of the Act.  This would result in changes that are
     processed through State minor NSR programs being excluded
     from the definition.
          Also, EPA proposes that part 71 follow today's proposal
     for part 70 with respect to EPA's interpretation of section
     502(b)(10) of the Act, as discussed in Section II. G. of
     this preamble.  Thus, all permitting authorities, including
     EPA under part 71 programs, would be subject to the same
     requirement to issue permits containing emissions caps under
     which sources could trade certain emissions increases and
     decreases without seeking permit revisions, consistent with
     applicable requirements.  Therefore, EPA proposes to
     incorporate the changes proposed today to  70.4(b)(12)(i)
     into the corresponding section of part 71 on operational
     flexibility, proposed  71.6(p)(1).  The EPA further
     proposes to adopt definitions for part 71 that are
     consistent with the definitions contained in proposed  70.2
     with respect to the following terms: advance NSR,
     alternative scenarios, emissions cap permit, plantwide
     applicability limit, and State review program.
          In addition, EPA today proposes three changes to EPA's
     prior proposal relating to permit fees under the part 71
     program.  First, EPA proposes that delegation agreements be
     required to include a condition that the delegate agency
     have sufficient resources to administer the part 71 program. 
     Initially, EPA believed that it would be required to provide
     funds to delegate agencies to enable them to carry out the
     responsibilities outlined in the delegation agreements. 
     This remains the case in many States, and for those States,
     the delegation agreement would acknowledge that EPA would
     impose fees on permitted sources sufficient to cover program
     costs.  However, EPA has become aware that there are several
     States that have authority under existing State law to
     charge permit fees that EPA believes may be sufficient to
     fund a part 71 program.  In the context of delegating
     part 71 administration to any specific State, EPA intends to
     assess the adequacy of the State's existing fee authority to
     determine whether it is sufficient to cover costs of running
     a part 71 program.  If the delegate agency has adequate fee
     revenue from sources subject to title V to fund a fully-
     delegated part 71 program, EPA would grant delegation and
     would thereafter incur no program costs.  However, EPA's
     decision to delegate and its assessment of the State's fee
     authority would in no way constitute EPA approval of the
     State's fee structure for purposes of part 70, or in any way
     prejudge EPA's evaluation of a State's submitted part 70
     program.  To provide sources in such States with relief from
     part 71 fee requirements, EPA proposes to revise
      71.9(c)(2) to provide that when EPA has fully delegated a
     part 71 program to a State that had adequate fee authority
     to receive delegation and EPA incurs no program costs to
     administer the program, sources would not be subject to the
     fee requirements of part 71.  In situations where sources
     are already paying fees to the delegate agency that are
     adequate to fund the part 71 program, EPA believes that it
     would be inequitable to require sources to pay fees to EPA
     as well.
          When a State seeks delegation of only a portion of the
     part 71 program, sources would not be relieved from the
     part 71 fee requirements because EPA would incur some costs
     in administering the portion of the program that was not
     delegated.  In such a case, EPA would determine whether the
     fee structures provided in proposed  71.9(c)(1)-(4) would
     reflect the costs of administering the part 71 program.  If
     not, EPA would need to set appropriate fees through a
     separate rulemaking, as per proposed  71.9(c)(7).
          Second, the EPA proposes to eliminate the $3 per ton
     surcharge for delegated and contractor administered programs
     from the fee formula in proposed  71.9(c)(3) because EPA
     believes that for purposes of title V permit fees, the cost
     of EPA's oversight of State-administered programs should be
     treated the same regardless of whether the program has been
     delegated under part 71 or approved under part 70.  The
     EPA's oversight costs of State part 70 programs are not
     covered by State permit fees and are not passed along to
     industry.  The part 71 rule as proposed today would treat
     EPA oversight costs in delegated part 71 and approved
     part 70 programs consistently.  For similar reasons, the
     cost of preparing guidance for the part 71 program would be
     deleted from the list of activities that comprise "program
     costs" in proposed  71.9(b).
          Third, EPA proposes to reduce the per ton fee amount in
     proposed  71.9(c)(1) and  71.9(c)(3) from $45 to $38, to
     reflect EPA's lower program costs resulting from the
     streamlined permit revision procedures proposed today.  The
     data supporting the lower estimate of program costs are
     contained in a document entitled "Supplement to the Federal
     Operating Permits Program Fees and Cost Analysis" which is
     contained in the docket for this rulemaking.
          The EPA solicits comments on whether the approach taken
     in the fee provisions proposed today is appropriate and
     would result in adequate revenue being generated to offset
     program costs, and whether, in general, the fee provisions
     of proposed part 71 could be structured in a manner that
     more closely reflects the true costs of administering the
     part 71 program.
     
     V.  Other Changes and Clarifications
     A.  Rationale for Proposed Exemption for Non-major R&D
     Activities
          The Agency is today clarifying the reasoning behind its
     July 21, 1992 preamble discussion regarding R&D activities,
     and is proposing changes to the definition of "major source"
     in part 70 that better reflect this intent.  As explained
     below, States have flexibility under part 70 regarding
     whether to consider R&D operations as part of the source
     with which it is sited for purposes of determining whether a
     major source is present.
          The part 70 major source definition requires
     aggregation of "all of the pollutant-emitting activities
     which belong to the same industrial grouping, are located on
     one or more contiguous or adjacent properties, and are under
     the control of the same person (or persons under common
     control)."  Following NSR/PSD precedent, EPA chose the major
     (2-digit) Standard Industrial Classification (SIC) code
     categories established by the U.S. Department of Commerce to
     delineate an "industrial grouping." 
          In response to comments requesting exemption of R&D
     activities from title V, EPA stated in the preamble to the
     final part 70 rule that, "in many cases States will have the
     flexibility to treat an R&D facility . . . as though it were
     a separate source, and [the R&D facility] would then be
     required to have a title V permit only if the R&D facility
     itself would be a major source" (57 FR 32264 and 32269,
     July 21, 1992).  Read consistently with the "major source"
     definition in the rule, however, this statement could be
     read as meaning that separate source treatment would occur
     only in situations where the R&D portion of a source has its
     own two-digit SIC code and is not a support facility.
          In light of the uncertain meaning of the July 21, 1992
     preamble statement, industry representatives have continued
     to express concerns over the permitting of R&D operations. 
     The EPA recognizes that R&D operations typically entail the
     use of small quantities of chemicals manipulated and
     released in a highly variable manner, and that these
     attributes are present at R&D operations to a degree that
     distinguishes them from other source categories.  The EPA
     further recognizes that, because of these unique
     combinations of attributes, bringing collocated non-major
     R&D facilities into part 70 permitting could potentially
     lead to difficult exercises in emissions estimating and
     tracking and impose additional monitoring and recordkeeping
     requirements (where the R&D operation is subject to an Act
     requirement).
          In response to these continuing concerns, EPA is today
     offering a more detailed explanation of the SIC code
     approach as it affects R&D operations.  In addition, EPA is
     proposing revisions to the part 70 major source definition
     to resolve any ambiguities that may derive from the SIC code
     manual, and to ensure that the same result obtains for
     purposes of section 112 if the changes to the major source
     definition proposed on August 29, 1994 are carried to
     finality.  The EPA recognizes that parallel rule revisions
     would be required for part 63 (the section 112 General
     Provisions) and parts 51 and 52 (NSR and PSD).  These other
     rules would be revised through a separate rulemaking action.
          At the time of the July 1992 promulgation, EPA believed
     that R&D was not specifically addressed by the SIC code
     manual in any way.  It would have followed that the question
     of whether and how R&D should be considered part of a source
     would be answered in light of the rules traditionally
     applied to determine the extent to which activities at a
     site are functionally integrated.
          In general, to be considered a functional part of an
     industrial activity, a facility must contribute to that
     activity in a material, rather than merely conceptual,
     manner.  The EPA believes that operations as proposed for
     definition in  70.2 do not contribute to the product or
     service rendered at an industrial site in any relevant
     sense.  By definition, the product of an R&D operation is
     information potentially useful to create a new industrial
     process or to improve the process ongoing at the facility,
     but not to directly support the process in which the
     industrial activity is currently engaged or capable of
     engaging in any significant commercial fashion.  It follows
     that R&D would not be considered part of the industrial
     activity with which it is located, despite its location, and
     must therefore be treated as if it were a separate source
     belonging to a separate 2-digit SIC code.
          Under the Agency's support facility test, even where
     neighboring, commonly controlled sources have different 2-
     digit SIC codes, they should be aggregated to determine
     whether a major source is present if the output of one is
     more than 50 per cent devoted to support of another. 
     However, EPA believes that R&D operations should not
     generally be considered support facilities, since the
     "support" provided is directed towards development of new
     processes or products and not to current production.
          The limits of this interpretation should be self-
     evident.  To the extent an activity bears some resemblance
     to R&D but in fact contributes to the ongoing product
     produced or service rendered at a facility in a more than de
     minimis manner, those activities should be considered part
     of the source.  Pilot plants often present instances of
     activities that are conducted on a trial basis, but which
     are nevertheless dedicated to producing a product for
     commerce to a more than de minimis extent, and so would not
     be considered R&D.  The EPA has spoken directly to the types
     of processes that qualify as R&D in the context of certain
     section 112 MACT standards.  These descriptive statements
     address the question of whether R&D should be included in
     particular MACT source categories, rather than major source
     applicability, and so are not relevant to the principles
     discussed in this notice.
          Since the July 1992 promulgation, EPA has learned that
     the SIC code manual itself presents an obstacle to this
     interpretation, because it provides that R&D should
     generally be grouped with the four-digit code activity with
     which it is most closely associated.  Because this contrasts
     with EPA's understanding at the time of promulgation of
     part 70, EPA believes it appropriate to continue to
     implement the current rule to allow for separate
     consideration of R&D as described above.  At the same time,
     EPA is today proposing to revise the major source definition
     to clarify that R&D should be treated as having its own
     industrial grouping for purposes of the title I and section
     302(j) elements of the major source definition.
          A parallel rule revision is also being proposed for the
     section 112 element.  This is because the August 1994
     proposal would change the part 70 definition to conform to
     the section 112 General Provisions, which do not use the SIC
     code approach to source aggregation.  Today's notice
     proposes to establish a narrow exception for R&D facilities. 
     Because the major source definitions used under title V must
     be consistent with other Act programs, EPA plans to follow
     this revision to part 70 with conforming revisions to the
     major source definition in the section 112 General
     Provisions and other section 112 rules.  In addition, a new
     definition for "research and development activities" is
     proposed for  70.2.
          The EPA's authority for this part 70 revision is the
     same as that which supported its adoption of the 2-digit SIC
     code limitation in parts C and D of title I and thus in
     title V.  As EPA stated in its 1980 promulgation of PSD
     regulations, the 2-digit SIC code grouping embodies a common
     sense notion of a "plant" that is appropriate for the PSD
     program (45 FR 52694 (August 7, 1980)).  For title I and
     section 302(j) purposes, the establishment of a separate
     industrial grouping for R&D simply represents a further
     refinement to that common sense approach.
          The EPA chose not to adopt the SIC code approach in the
     section 112 context because it concluded that a definition
     that encompassed the entire contiguous commonly owned
     facility would be more consistent with the overall intent of
     section 112.  However, the statutory language of section
     112(a)(1), which refers to "any stationary source or group
     of stationary sources" (emphasis added), leaves EPA
     discretion to separate out discrete groups of stationary
     sources that are located together only for administrative
     convenience, rather than because they contribute to other
     activities at the site.  That this same language appears in
     the various nonattainment "major source" definitions added
     by the 1990 Act Amendments, where EPA's historical practice
     has been to allow disaggregation by major industrial
     grouping, further supports this interpretation.  The EPA now
     believes that a disaggregation of R&D operations makes sense
     in the context of section 112, as well as title I and thus
     in title V, because (1) they are operations which by
     definition could stand alone, but which are located with
     other sources primarily for administrative convenience, and
     (2) the inherent changeability of these operations.
          The reasonableness of this separate treatment is
     further supported by section 112(c)(7), which states that,
     for section 112 purposes, "the Administrator shall establish
     a separate category covering research or laboratory
     facilities, as necessary to assure the equitable treatment
     of such facilities."  Although this provision addresses
     source categorization for promulgation of standards rather
     than applicability, it clearly evidences a concern that R&D
     operations not be grouped with other types of operations in
     a way that overlooks the particular challenges associated
     with their regulation.
          The EPA wishes to emphasize that R&D operations present
     a unique case under section 112.  As noted above, EPA, after
     studying the matter, has concluded that R&D is unique in
     terms of the variability and unpredictability of processes. 
     Also, as previously discussed, R&D operations are inherently
     divorced from the primary activity at a facility.  While
     other types of activities may or may not support the primary
     activity depending upon the configuration at a particular
     site, R&D activities categorically do not (except, as the
     definition would provide, in a de minimis manner).
          Today's notice does not define the term "de minimis" as
     used in the definition of R&D.  The EPA solicits comment on
     whether it should attempt to further define de minimis in
     the final rule, and if so, what criteria would be
     appropriate.  For instance, de minimis might be defined in
     absolute terms, in terms of the amount of the R&D product
     that is offered to the industrial activity relative to the
     total product from the R&D operation, or in terms of the
     amount of support from the R&D operation relative to the
     magnitude of that activity.
          The EPA also solicits comment on whether the special
     treatment afforded by this proposal should be extended to
     laboratory activities that are not R&D.  The proposal would
     exclude such laboratory activities.  The reasoning is that
     other laboratory activities fall outside of the rationale
     supporting special treatment, since they are likely to be
     more predictable in their operations and to be functionally
     integrated with on-site industrial activities.  The Agency
     solicits comment on whether there are other categories of
     laboratory activities for which this is typically not the
     case.
          As noted above, several States interpreted the July
     1992 preamble discussion of R&D activities as authorizing
     the creation of a separate applicability category for R&D,
     apart from the 2-digit SIC code approach.  Most of these
     provisions have been identified as grounds for interim
     approval.  The EPA notes that while these programs aim for a
     similar result, they are not uniform in their specifics. 
     For instance, definitions of R&D may differ from EPA's
     definition or may be absent altogether.  For this reason,
     EPA is not today commenting on whether the clarification in
     today's notice merits a change in the approval status of any
     of these programs, but instead plans to address this on a
     case-by-case basis.
          Notwithstanding the preceding approach which provides
     for separate treatment of the majority of R&D activities,
     two issues remain related to when such R&D activities would
     independently be considered to be major under part 70. 
     Specifically, one issue concerns the effect of a facility
     that supports the R&D activity on the status of the R&D
     activity and the other issue concerns how the PTE for R&D
     activities is to be determined.
          Industry has expressed concern about a stand-alone R&D
     activity (i.e., not located with a manufacturing facility)
     which is supported by another activity (e.g., a boiler)
     which on its own may exceed major source thresholds.  This
     issue is not addressed by placing the R&D activity in a
     separate SIC category, which would only cause the R&D
     activity to be treated separately.  The boiler would be
     considered part of the stand-alone R&D activity if it was
     functionally integrated with the R&D activity.  The R&D
     activity together with the boiler would then be considered
     major.  Industry has recommended that boilers and other
     support facilities not be considered part of an R&D
     activity.
          The EPA recognizes that disparate treatment may result
     if an R&D activity at a major manufacturing facility would
     be considered separate and non-major, while another R&D
     activity of the same size standing alone would be considered
     a major source only because of its support facilities.  The
     Agency, therefore, believes an R&D activity should be
     considered separate from major support facilities just as it
     would be separate from a major manufacturing source, and
     solicits comment on whether it should provide an exemption
     from major source determination rules in the case of
     facilities that support R&D activities.  The EPA, however,
     recognizes the potential for this approach to apply in many
     other circumstances with a possible erosion of the concept
     of a source as the sum of functionally integrated parts, a
     result the Agency does not support.  The Agency therefore
     suggests commenters provide rationale as to how the approach
     can be limited to R&D activities.
          As noted, a source must calculate PTE from an R&D
     operation to determine whether it is major.  In light of the
     previously mentioned difficulty of performing emission
     calculations, and the data gathered by EPA to date
     (discussed in footnote 6 above), which indicates that even
     large R&D facilities tend to have very low actual emissions,
     EPA considers it of little benefit to require R&D facilities
     to go through extensive efforts in calculating PTE. 
     Permitting authorities will bear primary responsibility for
     determining the PTE of individual R&D facilities, and EPA
     intends to generally defer to these judgments.  Given the
     small likelihood that any R&D operation will be major, EPA
     believes permitting authorities should accept methods of
     calculating PTE from R&D operations that are not unduly
     burdensome on the source.
          Some have claimed that deriving a numerical PTE
     calculation from an R&D activity is simply not possible,
     because experiments are typically performed only once or a
     few times, meaning that past emissions are at best a poor
     indicator of the future.  The EPA is unsure whether this
     renders PTE calculations strictly impossible, but
     acknowledges a high degree of difficulty.  The EPA believes
     R&D may present a case suitable for a de minimis exception
     from the statutory requirement to calculate PTE, because
     emissions are so low as to yield a gain of trivial or no
     value compared to the difficulty associated with their
     measurement.  Comment is solicited on whether such an
     exception would be appropriate, and more generally on the
     availability of cost-effective means of calculating PTE from
     R&D activities.
     B.  Emergency Defense
          Section 70.6(g) sets forth the terms of an emergency
     defense that States may include in part 70 permits at their
     discretion.  It is available for violations of technology-
     based emission limits that are unavoidably caused by "any
     situation arising from sudden and reasonably unforeseeable
     events beyond the control of the source, including acts of
     God. . ." 
          In the preamble to the final rule, EPA explained that
     it modeled the part 70 defense after the NPDES permit upset
     provision at 40 CFR 122.41.  The NPDES provision was
     promulgated in response to several cases under the Clean
     Water Act (CWA) that held that EPA must provide an upset
     defense for technology-based effluent limits to take account
     of the fact that even properly operated technology can
     unexpectedly fail (Marathon Oil v. EPA, 564 F.2d 1253 (9th
     Cir. 1977)).  The Agency extended the reasoning of these
     cases to technology-based air pollution control standards in
     promulgating an emergency defense in part 70.  At the same
     time, EPA noted that other courts had ruled that EPA was not
     required to provide such a defense but could instead rely on
     the exercise of enforcement discretion to address violations
     caused by emergencies.
          The part 70 emergency defense was challenged by State
     and local government, environmental group, and industry
     petitioners in CAIP v. EPA.  The governmental and
     environmental petitioners were concerned that the rule
     required States to provide the defense, despite the
     existence of potentially different State defenses.  They
     also questioned EPA's legal authority to promulgate an
     across-the-board defense for violations of limits that may
     have been set in a manner that took into account the
     possibility of emergencies or upsets.  Industry, on the
     other hand, objected to the narrowness of the defense and
     urged that the defense be made available for violations that
     may occur as a result of plant start-up, shut-down,
     malfunction, or preventative maintenance.  Some industry
     petitioners also urged EPA to make the defense available to
     violations of limits based in whole or in part on health
     protection.
          At the outset, EPA wants to make clear that the part 70
     rule does not require that States adopt the emergency
     defense.  A State may include such a defense in its part 70
     program to the extent it finds appropriate, although it may
     not adopt an emergency defense less stringent than that set
     forth at section 70.6(g).  As noted above, the part 70
     defense is modeled on the NPDES upset provision, which
     States may omit if they desire to establish a more stringent
     water pollution control program than federal law requires
     (40 CFR 123.25(a)(12); Sierra Club v. Union Oil Co. of
     California, 813 F.2d 1480, 1484 (9th Cir. 1987)).  Like the
     CWA, the Act in sections 116 and 506(a) authorizes States to
     establish additional or more stringent air pollution control
     or permitting requirements.  Consistent with that, States
     may decide to provide an emergency defense that is narrower
     in scope or more stringent in application than  70.6(g) or
     no defense at all.  Consistent with  70.11(b), States may
     also provide for any affirmative defense that would be
     available in an enforcement action brought pursuant to
     section 113 of the Act.
          The Agency has reviewed the legal basis for the
      70.6(g) defense.  As noted above, the relevant CWA case
     law is split.  While Marathon Oil and several other courts
     have required EPA to provide an upset defense, either
     through a permit program or in the underlying substantive
     requirement, to address the fallibility of technology, other
     courts have not out of concern that such a defense was
     inconsistent with Congress' intent that technology-based
     effluent limits force technological development and that
     enforcement of such limits be "swift and direct" (Corn
     Refiners Ass'n, Inc. v. Costle, 594 F.2d 1223, 1226 (8th
     Cir. 1979), Weyerhaeuser Co. v. Costle, 590 F.2d 1011, 1057
     (D.C. Cir. 1978)).  Other courts have ruled that no upset
     provision is required or appropriate where EPA took the
     fallibility of technology into account in setting the
     technology-based standard for which an upset defense was
     sought (CPC Int'l, Inc. v. Train, 540 F.2d 1329, 1336-38
     (8th Cir. 1976), American Petroleum Inst. v. EPA, 540 F.2d
     1023, 1035-36 (10th Cir. 1976)).  These cases counsel
     caution in the application of a uniform emergency defense to
     standards which were previously established under several
     different Act provisions.  To determine the extent to which
     the part 70 defense may be appropriately applied, it is
     necessary to examine the basis and terms of the different
     Act technology-based standards to which it would apply.
          New source performance standards are established by EPA
     under section 111 of the Act based on the best system of
     emission reduction, considering costs and other relevant
     factors, that has been adequately demonstrated.  The
     regulations that generally govern the implementation of NSPS
     provide that exceedances of NSPS during periods of start-up,
     shut-down, and malfunction are not violations of the
     applicable limit unless otherwise specified in the
     applicable standard ( 60.8(c)).  In other words, sources
     are not obligated to meet NSPS when starting up, shutting
     down, or experiencing malfunctions except to the extent EPA
     has required otherwise in setting a particular NSPS.  There
     is thus no need for an affirmative defense for exceedances
     that occur under those circumstances.  The NSPS general
     provisions do not address the availability of a defense for
     violations caused by emergencies, as defined in part 70, and
     the Agency has relied on enforcement discretion to address
     such situations.
          National emission standards for hazardous air
     pollutants were established by EPA under section 112 of the
     Act prior to the 1990 Act amendments.  Section 112 prior to
     the 1990 amendments required EPA to set NESHAP at the level
     which provides an ample margin of safety to protect the
     public health from the HAP being regulated.  In promulgating
     NESHAP, EPA did not provide for affirmative defenses, since
     the standards were formulated largely without regard to the
     limits of technology.  The Agency did not extend the part 70
     emergency defense to NESHAP for the same reason. 
          The 1990 amendments to the Act changed the basis for
     setting standards for HAPs.  Section 112 now requires the
     Agency to promulgate standards for more than 180 HAPs based
     on the maximum achievable control technology, taking into
     account costs and other relevant factors.  The Agency has
     promulgated general provisions governing implementation of
     the so-called MACT standards, and those provisions, like the
     NSPS general provisions, do not require sources to comply
     with MACT standards when starting up or shutting down or
     when malfunctions occur (40 CFR 63.6(f)).  Like NSPS, there
     is thus no need for a defense for exceedances that occur
     under those circumstances.  Again like the NSPS regulations,
     the MACT general provisions do not address the availability
     of a defense for violations of MACT standards that occur as
     a result of an emergency.
          States also establish technology-based limits pursuant
     to their SIP's, including those set pursuant to major and
     minor NSR programs.  Many States' SIP's provide an
     affirmative defense for violations of SIP technology-based
     limits.  The EPA has approved these where consistent with
     its 1983 SIP policy.  The terms of these defenses vary
     somewhat with the State, but they are generally available
     for violations that occur as a result of malfunctions, and,
     for certain types of limits, for start-up and shut-down as
     well.  In any event, States may be presumed to set
     technology-based limits with any approved SIP defenses in
     mind.
          The foregoing description of the Act's major
     technology-based standards raises several questions about
     the appropriateness and terms of any part 70 defense. 
     First, since at least most of these standards provide either
     an exemption from compliance or an affirmative defense for
     exceedances caused by start-up, shut-down, and malfunction
     conditions, a part 70 defense covering these conditions
     would be largely redundant.  Second, to the extent that some
     NSPS or MACT standards do not provide relief for these
     conditions, it is because EPA has made a decision not to
     provide it (in the case of health-based standards) or, in
     case of many technology-based limits, because EPA has taken
     account of the failures of technology in setting the
     numerical emissions limit.  Similarly, to the extent a
     technology-based limit established by a State does not
     provide an affirmative defense for start-up, shut-down, or
     malfunctions, it may be because the State judged that such a
     defense was unnecessary or unwise.  Under these
     circumstances, it would appear inappropriate for the Agency
     to allow a generic emergency defense because it could have
     the effect of decreasing the stringency of the previously
     established standard or undercutting a technology-forcing or
     enforcement strategy undertaken by the Agency or a State in
     establishing the standard.
          As EPA has previously explained, the primary purpose of
     title V is to create for each covered source a permit that
     documents in one place all the Act requirements that apply
     to the source.  Title V itself does not authorize changes to
     requirements established pursuant to other Act provisions. 
     Section 504 requires that permits contain provisions as
     needed to assure the enforceability of the limits codified
     in the permit, but that does not authorize changes in the
     stringency of those limits.  In keeping with the
     codification purpose of title V, EPA believes that its
     authority under title V to provide for affirmative defenses
     for violations of permit terms is limited.  Where the
     rulemaking establishing a limit addresses the need for and
     terms of any affirmative defense, there is no basis for
     providing additional or different defenses under title V.  
          While the foregoing description of technology-based
     standards indicates there is little or no basis for
     providing a start-up, shut-down, preventative maintenance,
     or malfunction defense, the question still remains whether
     part 70 can and should provide an emergency defense.  As
     noted above, the NSPS and MACT general provisions and
     apparently most SIP's do not provide an emergency defense
     per se.  It is not entirely clear why that is the case. 
     Most likely, prosecutorial discretion was considered an
     adequate and even preferable mechanism for addressing
     violations caused by emergencies.  Several CWA cases also
     suggest that upset or emergency defenses could be
     unnecessary where standards were set taking into account the
     possibility of emergencies and could have the effect of
     slowing the development of technology or making enforcement
     slower and less sure.
          The EPA is reluctant to retain a generally applicable
     emergency defense without completing further review of the
     appropriateness of such a defense for the different Federal
     technology-based standards in light of the concerns with
     such a defense raised in the CWA cases.  A review of the
     bases for setting these standards is necessary to ensure
     that the standards do not already take into account the
     possibility of emergencies.  Beyond that, EPA wants to
     further consider the consequences of such a defense on the
     different types of federal technology-based standards for
     technology-forcing and enforcement.
          For similar reasons, EPA also is concerned about
     establishing a generic emergency defense that would apply to
     State-established limits.  The appropriateness of providing
     a defense is best judged by a State in light of its
     standard-setting methodologies and environmental and
     enforcement goals.  As currently provided in  70.6(g)(5),
     the emergency defense is in addition to any defense provided
     for in an applicable requirement.  This includes any defense
     appropriately provided for in a technology-based SIP limit. 
     Beyond that, an EPA decision not to retain an emergency
     defense in part 70 would not preclude a State from adopting
     a defense in its SIP for technology-based SIP limits
     consistent with its standard-setting methodologies.  The
     SIP-based defense could then be referenced in the State's
     part 70 permits as appropriate.
          The EPA has not reached a firm conclusion on whether to
     limit the availability of the emergency defense to part 70-
     only provisions.  The Agency solicits comment on whether
     such a limitation is appropriate in light of EPA's goal of
     providing States flexibility in implementing their part 70
     programs.  The EPA's final decision on this issue will be
     based on the record developed through this proposal.
          It may nevertheless be appropriate for EPA to provide
     relief under title V authority for exceedances of
     technology-based limits uniquely established in part 70
     permits.  Part 70 permitting will be the forum for
     establishing limits pursuant to section 112(j) and
     112(i)(5); alternative limits pursuant to  70.6(a)(1)(iii),
     including any substitute section 112 standards set under a
     program approved by EPA under section 112(l); and limits to
     a source's potential to emit for purposes of avoiding
     otherwise applicable Act requirements.  Of these, at least
     section 112(j) limits will, and alternative limits under
      70.6.(a)(l)(iii) and section 112(l) programs may, be
     technology-based.  The EPA believes that in setting
     technology-based limits as part of title V permitting,
     States should have discretion to afford sources relief from
     exceedances that may occur as a result of start up, shut
     down, and malfunctions as appropriate in view of the state's
     standard-setting methodology.
          The EPA is considering using the start-up, shut-down,
     malfunction provisions of the MACT general provisions as the
     model for a part 70 counterpart.  As noted earlier, the MACT
     (and NSPS) general provisions provide that those standards
     need not be met during periods of start-up, shut-down, and
     malfunction, as opposed to providing a defense to violations
     of the standards under those conditions.  While EPA does not
     believe an outright exemption such as this would be
     appropriate in part 70, the Agency solicits comment on
     whether part 70 should authorize States to provide an
     affirmative defense for compliance with part 70-only
     technology-based limits under start-up, shut-down, and
     malfunction conditions.  The EPA believes it appropriate to
     condition the availability of such relief on the submittal
     of and adherence to a plan like that required in
      63.6(e)(3), establishing a protocol for the source during
     those periods.
          The Agency also believes that States should have
     discretion to provide an emergency defense for violations of
     part 70-only technology-based limits similar to that set
     forth in the current rule.  Suggestions have been made that
     the Agency adopt a definition of emergency identical to that
     of "upset" under the NPDES regulations ( 122.41(n)).  The
     Agency notes that the current rule's definition of emergency
     was drafted to avoid any implication that emergencies could
     include start-up, shut-down, and preventative maintenance
     conditions.  Since EPA is considering addressing those
     conditions with an exemption from compliance as described
     above, it is inclined to retain the current rule's
     definition of "emergency."  The Agency solicits comment on
     the advantages and disadvantages of a uniform definition of
     upset or emergency across the water and air permitting
     programs.
          Several States have also raised the question of whether
     part 70 should authorize permitting authorities to grant a
     source temporary authorization to make a change without
     revising permits as needed to protect public health or
     welfare in emergencies, such as natural disasters.  The
     South Coast [California] Air Quality Management District
     (SCAQMD) has pointed out that local governments operating
     essential public services have had to respond to emergencies
     such as earthquakes, fires, and civil disturbances in ways
     that applicable permit terms might not have allowed.  The
     State of New York has similarly noted instances when sources
     have needed to make changes on short notice to respond to
     emergencies such as severe winter storms.  Both
     jurisdictions have available as a matter of State law a
     mechanism for granting sources temporary authorizations to
     make changes without revising the source's permit under
     specified circumstances and in accordance with prescribed
     procedures.  See SCAQMD's breakdown rule (Rule 430) and
     State law provisions regarding variances (Health & Saf. Code
     42350-42364, particularly  42352), and New York's
     regulations at Title 6 Section 621.12.
          The Agency solicits comment on the need for a part 70
     provision authorizing States to provide the kind of
     emergency authorizations described above.  States could rely
     on the exercise of enforcement discretion to avoid
     penalizing sources for permit violations incurred as a
     result of State-sanctioned actions taken to safeguard the
     public from serious harm in times of emergencies.  However,
     under title V and part 70, citizens may bring enforcement
     actions for violations of permit terms.  While it would seem
     doubtful that anyone would seek to prosecute a violation
     caused by a source's actions to respond to a public health
     crisis, States and sources may well prefer that sources be
     relieved from the risk of liability under such
     circumstances.
          The Agency also solicits comment on the proper scope
     and terms of any such authorization provision.  The SCAQMD
     has limited its concerns to essential public services
     operated by local governments, while New York's regulations
     authorize changes at sources regardless of whether they are
     publicly or privately owned.  For New York the only
     essential criterion is whether the change is needed to
     respond to an emergency, which its regulations define as "an
     event which presents an immediate threat to life, health,
     property, or natural resources."  New York's regulations
     also limit the duration of such authorizations to at most
     two 30-day terms.
          Procedural safeguards are important to the exercise of
     any such authority.  New York's regulations require prior
     notification of a change by the source requesting emergency
     authorization unless prior notification is not possible. 
     The regulations also require that the State permitting
     authority, prior to issuing an emergency authority, make a
     finding of an emergency, stating why immediate action is
     needed and the consequences if the action is not immediately
     taken.  The permitting authority must also determine that
     the change is being made in a manner that will cause the
     least change, modification, or adverse impact to life,
     health, property, or natural resources.  The permitting
     authority is authorized to attach such conditions to the
     authorization as it deems appropriate.  If the permitting
     authority finds that the change is no longer immediately
     necessary to protect life, health, property, or natural
     resources, it may issue an order requiring the source to
     immediately cease the action it has taken pursuant to the
     emergency authorization.
          New York's regulations provide one potential model for
     a part 70 provision authorizing States to provide emergency
     authorizations.  The extent of New York's procedural
     safeguards, however, may well be linked to the relatively
     broad scope of its emergency authorization, which, as noted
     earlier, extends to private as well as public sources and
     broadly defines emergency.  More narrowly tailored emergency
     provisions would presumably require fewer procedural
     safeguards.  The Agency requests that commenters addressing
     the proper scope of an emergency authorization also consider
     what procedural safeguards would be appropriate in light of
     the suggested scope.  The Agency believes that providing
     after-the-fact public notification of changes made pursuant
     to an emergency authorization provision would be
     appropriate.
     C.  Certification Language
          Section 70.5(d) of the current rule requires that any
     part 70 application form, report, or compliance
     certification contain a certification by a responsible
     official of the truth, accuracy, and completeness of the
     submission.  It further requires that any certification
     required under part 70 state that, "based on information and
     belief formed after reasonable inquiry, the statements and
     information in the document are true, accurate, and
     complete."  The text of  70.5(d) was adopted unchanged from
     the proposal.  In the preamble to the proposed rule, EPA
     explained that the required statement regarding the truth,
     accuracy, and completeness of the submission was modeled
     after Rule 11 of the Federal Rules of Civil Procedure. 
     Rule 11 provides that by presenting pleadings, motions, or
     other documents to Federal courts, a lawyer "is certifying
     that to the best of the person's knowledge, information, and
     belief, formed after an inquiry reasonable under the
     circumstances" that the documents are not presented for an
     improper purpose (e.g., to harass or cause delay); the
     claims made are warranted by existing law or by a non-
     frivolous argument for the extension, modification, or
     reversal of established law or the establishment of new law;
     and that allegations or factual contentions have or are
     likely to have reasonable evidentiary support.
          Among the issues raised by several State and local
     governments in their petitions for review of part 70 was the
     appropriateness of the certification language adopted by
     EPA.  The governmental petitioners were concerned that EPA
     was requiring certification language different from that
     required by the National Pollutant Discharge Elimination
     System (NPDES) under the CWA.  The NPDES regulations at
      122.22(d) require the following certification language:
          I certify under penalty of law that this document and
               all attachments were prepared under my direction or
               supervision in accordance with a system designed to
               assure that qualified personnel properly gather and
               evaluate the information submitted.  Based on my
               inquiry of the person or persons who manage the system,
               or those persons directly responsible for gathering the
               information, the information submitted is, to the best
               of my knowledge and belief, true, accurate, and
               complete.  I am aware that there are significant
               penalties for submitting false information, including
               the possibility of fine and imprisonment for knowing
               violations.
          In light of the NPDES certification language, State and
     local government petitioners read the part 70 certification
     language as potentially establishing a less rigorous
     standard for the inquiries on which certifications were to
     be based, and they believed their reading was confirmed by
     EPA's reference to Rule 11 as the model for the part 70
     language.  Beyond that, they noted that the meaning of the
     NPDES language had been well established over the years of
     its use, and were concerned that the meaning of the
     different part 70 language would not be clear until it had
     been decided by the courts.  The State and local petitioners
     therefore suggested that EPA revise its part 70
     certification to be identical to the NPDES certification
     language.
          The Agency agrees that Rule 11 is not an appropriate
     analog to the certification requirements of a permitting
     program.  Rule 11 effectively requires lawyers to make a
     reasonable inquiry into the relevant facts and law so they
     may assess whether the claims or arguments they raise in
     court have a reasonable chance of success.  Since courts'
     interpretation of the law can evolve as a result of a
     compelling factual case or argument, Rule 11 accords lawyers
     wide latitude in bringing cases.  By contrast, an inquiry
     into the truth, accuracy, and completeness of a factual
     submission should typically be a more straightforward
     exercise.  The official signing the certification is being
     asked to take reasonable steps to ensure that what he or she
     signs is true, accurate, and complete, not whether it
     provides a sufficient basis for a court to decide a question
     of law in the official's favor.  The Agency thus no longer
     believes that the part 70 certification language should be
     modeled on Rule 11.
          In place of the current rule's certification language,
     EPA proposes to require the certification language found in
     the acid rain rule promulgated under title IV of the Act at
     40 CFR 72.21(b)(2) and in the proposed enhanced monitoring
     rule at 58 FR 54689, col. 1 (proposed  64.5(c)).  Those
     provisions provide in relevant part:
          The responsible official shall certify, by his or her
               signature, the following statement:  "I certify under
               penalty of law that I above personally examined, and am
               familiar with, the statements and information submitted
               in this document and all of its attachments.  Based on
               my inquiry of those individuals with primary
               responsibility for obtaining the information, I certify
               that the statements and information are to the best of
               my knowledge and belief true, accurate, and complete. 
               I am aware that there are significant penalties for
               submitting false statements and information or omitting
               required statement and information, including the
               possibility of fine or imprisonment."
          This language is modeled on the NPDES language quoted
     above, but does not expressly require that there be a system
     designed to assure that qualified personnel properly gather
     and evaluate the submitted information.  The Agency believes
     it is not necessary to include that express requirement,
     since EPA expects that certifying officials will establish
     such systems where needed to assure the adequacy and
     reasonableness of their inquiry.
          In addition, there is an economy in requiring use of
     the same certification language in the three Act programs. 
     As the State and local petitioners pointed out, differences
     in language imply differences in meaning.  The Agency has no
     reason to think that a different standard for preparing
     certifications should apply to the part 70 program than
     applies in the acid rain program.  It thus proposes to adopt
     for the part 70 program the language now found in the acid
     rain rule.
     D.  Provisions Related to Tribal Programs
          On August 25, 1994 (59 FR 43956), EPA proposed
     regulations specifying those provisions of the Act for which
     it is appropriate to treat Indian Tribes as States.  Therein
     (59 FR 43971-72) EPA described expectations for Tribal
     programs in implementing various aspects of the part 70
     program and how they might differ from those expected for
     State part 70 programs.  Today's proposal contains part 70
     rule changes needed to conform part 70 to the August 25
     proposal.
          The reader should refer to the August 25, 1994 proposal
     for a more detailed description of the part 70 regulatory
     revisions proposed today to address Tribal programs
     (59 FR 43966-68, 43970-72, 43980-82).  The EPA has received
     many comments on the August 25, 1994 proposed rules and EPA
     may make changes to the proposal that in turn necessitate
     conforming changes to the part 70 revisions proposed today. 
     In today's action, EPA solicits comment on the limited issue
     of whether EPA has accurately proposed to implement the
     changes to part 70 previously described in the August 25,
     1994 proposal.  Comments addressing whether and how EPA
     should allow Indian Tribes to administer part 70 programs
     are outside the scope of today's action and should have been
     submitted in response to EPA's August 25, 1994 proposal.
     
     VI.  Administrative Requirements
     A.  Public Hearing
          No public hearing will be held to discuss this
     supplemental proposal unless a hearing is requested in
     writing and sufficient reason for a hearing is included in
     the written request.  The EPA has already engaged all
     interested groups in extensive public discussions on these
     topics and hopes to expedite the issuance of final
     regulatory revisions.  If a public hearing is held, it will
     take place on the last day of the comment period.  Persons
     wishing to attend a hearing, if held, should call (919) 541-
     5281 to determine if a hearing will be held and to obtain
     the time and location.  Persons wishing to request a public
     hearing must submit a written request to EPA during the
     first 15 days of the comment period at the address given in
     the ADDRESSES section of this preamble.
     B.  Docket
          The docket for this regulatory action pertaining to
     part 71 is A-93-50.  For actions pertaining to part 71, the
     docket is A-93-51.  The docket is an organized and complete
     file of all the information submitted to, or otherwise
     considered by, EPA in the development of this proposed
     rulemaking.  The principal purposes of the docket are: (1)
     to allow interested parties a means to identify and locate
     documents so that they can effectively participate in the
     rulemaking process, and (2) to serve as the record in case
     of judicial review (except for interagency review materials)
     (307(d)(7)(A)).  The dockets for today's notice are
     available for public inspection at EPA's Air Docket, which
     is listed under the ADDRESSES section of this notice.
     C.  Office of Management and Budget (OMB) Review
          Under Executive Order 12866 (E.O. 12866) (58 FR 51735
     (October 4, 1993)), section 4(c), EPA is required for
     significant regulatory actions to prepare an assessment of
     the potential costs and benefits (referred to as a
     Regulatory Impact Analysis (RIA)) of the regulatory action. 
     Sections 3(f)(1-4) of E.O. 12866 define "significant"
     regulatory actions as those that may:
          (1)  Have an annual effect on the economy of $100
     million or more or adversely affect in a material way the
     economy, a sector of the economy, productivity, competition,
     jobs, the environment, public health or safety, or State,
     local, or tribal governments or communities;
          (2)  Create a serious inconsistency or otherwise
     interfere with an action taken or planned by another agency;
          (3)  Materially alter the budgetary impact of
     entitlements, grants, user fees, or loan programs or the
     rights and obligations of recipients thereof; or
          (4)  Raise novel legal or policy issues arising out of
     legal mandates, the President's priorities, or the
     principles set forth in E.O. 12866.
          Pursuant to the terms of Executive Order 12866, OMB and
     EPA consider this and other actions related to part 70 and
     part 71 permit revisions a "significant regulatory action"
     within the meaning of the Executive Order.  The EPA has
     submitted this supplemental rulemaking proposal to OMB for
     review.  Changes made in response to OMB suggestions or
     recommendations will be documented in the public record. 
     Any written comments from OMB to EPA, and any EPA responses
     to those comments, will be included in Docket A-93-50 for
     part 70 changes and Docket A-93-51 for part 71 actions.
          To facilitate OMB review of the August 1994 proposed
     rulemaking, EPA prepared an analysis showing the marginal
     impacts of the proposed revisions to part 70.  That analysis
     would also bound the costs associated with the supplemental
     proposal contained herein.  As stated in the August 1994
     notice, the Agency is also in the process of updating the
     current ICR for part 70 which will be a comprehensive
     analysis of the final revised part 70.  A draft of that
     revised ICR is in docket A-93-50.  As noted under the DATES
     section of this notice, there is a 60-day comment period for
     the draft ICR.
          After review of the current RIA for part 70, (EPA-
     450/2-91-011), the Agency has determined that the effect of
     the changes to part 70 which would result from today's
     action will be less than both the current RIA and the
     estimate provided for the August 1994 proposal.  The
     estimates of the savings beyond the costs projected for the
     August 1994 proposal and the current rule are provided in
     the unfunded mandates section (Section V. F.) of this
     preamble.  The final estimate would ultimately depend in
     part on how States would use the additional flexibility
     provided to them in today's proposal.  However, considerable
     savings will occur as the State merges its preconstruction
     review program to also meet part 70 requirements.  This will
     allow subsequent permit revisions needed to incorporate such
     changes to occur administratively instead of through the
     more costly de minimis, minor, or even significant permit
     revision tracks described in the August 1994 proposal. 
     Analogous processes will be used under a part 71 program. 
     Savings will depend on its duration and how the Agency will
     work with States to implement any Federal permit program
     that is required.
     D.  Regulatory Flexibility Act Compliance
          Under the Regulatory Flexibility Act, whenever an
     Agency publishes any proposed or final rule in the Federal
     Register, it must prepare a Regulatory Flexibility Analysis
     (RFA) that describes the impact of the rule on small
     entities (i.e., small businesses, organizations, and
     governmental jurisdictions).
          The EPA has established guidelines which require an RFA
     to accompany a rulemaking package.  For any rule subject to
     the Regulatory Flexibility Act, the Agency's new policy
     requires a regulatory flexibility analysis if the rule will
     have any economic impact, however small, on any small
     entities that are subject to the rule, even though the
     Agency may not be legally required to do so.
          A regulatory flexibility screening analysis of the
     impacts of the original part 70 rules revealed that the
     original rule did not have a significant and
     disproportionate adverse impact on small entities.  The
     resulting administrative costs of the August 1994 proposal
     and of today's supplemental proposal for both part 70 and
     part 71 affect larger part 70 sources which are not
     typically believed to be small business entities. 
     Consequently, the Administrator certifies that the proposed
     revisions to part 70 and part 71 will not have a significant
     and disproportionate impact on small entities.  The EPA,
     however, solicits any information or data which might affect
     these proposed certifications.  The EPA will reexamine this
     issue and perform any subsequent analysis deemed necessary. 
     Any subsequent analysis will be available in the respective
     dockets for part 70 and part 71 and will be taken into
     account before promulgation.
     E.  Paperwork Reduction Act
          The ICR requirements for the part 70 regulations were
     submitted for approval to OMB under the Paperwork Reduction
     Act, 44 U.S.C. 3501 et seq.  The ICR was prepared by EPA in
     association with the promulgation of part 70 and a copy may
     be obtained from Sandy Farmer, Information Policy Branch
     (mail code 2136), U.S. Environmental Protection Agency, 401
     M St. S.W., Washington D.C. 20460, (202) 260-2740.
          The screening analysis for the revisions to part 70
     indicates a need to revise the current burden estimate and,
     in addition, the current ICR is due to be updated since it
     was only for a period of 3 years after promulgation of
     part 70.  However, EPA is preparing an ICR for the entire
     part 70 rule to reflect part 70 at the time the proposed
     revisions to part 70 are promulgated.  This ICR will
     supersede or replace the update of the original part 70 ICR
     upon promulgation of the revisions to part 70.  The draft
     ICR for the proposed part 71 rule will be amended as
     necessary upon promulgation of the part 71 rule.  The draft
     ICR for the revised part 70 is in docket A-93-50 and subject
     to a 60-day comment period.
          Send comments regarding the burden estimate in the
     draft ICR or any other aspect of this collection of
     information, including suggestions for reducing this burden
     by [60 DAYS AFTER PUBLICATION] to:  Chief, Information
     Policy Branch (2136), U.S. Environmental Protection Agency,
     401 M Street, S.W., Washington, D.C. 20460; and to the
     Office of Information and Regulatory Affairs, Office of
     Management and Budget, Washington, D.C. 20503, marked
     "Attention:  Desk Officer for EPA."  The final rule
     revisions will respond to any OMB or public comments on the
     information collection requirements contained in this
     proposal.
     F.  Unfunded Mandates
          Section 202 of the Unfunded Mandates Reform Act of 1995
     ("Unfunded Mandates Act") (signed into law on March 22,
     1995) requires that the Agency prepare a budgetary impact
     statement before promulgating a rule that includes a Federal
     mandate that may result in expenditure by State, local, and
     tribal governments, in the aggregate, or by the private
     sector, of $100 million or more in any one year.
          Section 203 of the Unfunded Mandates Act provides that
     if any small governments may be significantly or uniquely
     impacted by the rule, the agency must establish a plan for
     obtaining input from and informing, educating, and advising
     any such potentially affected small governments.
          Under section 205 of the Unfunded Mandates Act, the
     Agency must identify and consider a reasonable number of
     regulatory alternatives before promulgating a rule for which
     a budgetary impact statement must be prepared.  The Agency
     must select from those alternatives the least costly, most
     cost-effective, or least burdensome alternative for State,
     local, and tribal governments and the private sector, that
     achieves the objectives of the rule, unless the Agency
     explains why this alternative is not selected or unless the
     selection of this alternative is inconsistent with law.
          The costs of implementing the system for revising
     operating permits in today's proposal were estimated to
     determine the burden on permitting authorities and industry
     of complying with the requirements.  Since the regulatory
     revisions to part 70 would replace requirements now in
     place, however, the actual impact of promulgating today's
     proposed revisions should be viewed in terms of the
     difference in costs of implementing the current part 70 vs.
     the proposed requirements.
          Costs were estimated in terms of the administrative
     burden on permitting authorities, EPA, and permitted
     sources.  Administrative cost includes a range of costs
     which cover the source's preparing an application through
     EPA's and the permitting authority's effort to complete the
     process.  The administrative costs of implementing today's
     proposed revisions to part 70 are estimated to be
     approximately $33 million per year.  In comparison, EPA
     estimates the administrative costs associated with
     implementing the current part 70 permit revision system to
     be approximately $118 million per year in administrative
     burden.  The actual impact of implementing the proposed
     permit revision system in today's notice, therefore,
     represents a reduction in costs of 72 per cent over
     implementing the current part 70.
          Today's proposal would reduce the overall explicit
     costs associated with the part 70 permitting program by 16
     per cent from $526 million to $441 million annually.  This
     reduction in explicit costs does not represent the complete
     universe of changes to the 1992 ICR.  These changes,
     together with additional changes to the part 70 rule
     proposed in August 1994 and other more recent information
     received from the initial implementation of part 70, will be
     incorporated into the ICR update for part 70 due in October
     1995.
          The ICR for the proposed part 71 incorporated the basic
     approach proposed today for part 71 permit revisions.  In
     this document EPA estimated that the total direct cost of
     part 71 implementation to the private sector would be no
     more than $72 million in any one year.  The estimate of
     direct costs to industry includes the costs that are over
     and above costs industry would have incurred by complying
     with State operating permits programs mandated by the Act,
     for which part 71 programs are substitutes.  The specific
     cost of permit revisions would be only a small percent of
     this amount.
          The Agency concludes that since the proposed revisions
     to part 70 would result in reductions in costs over
     implementation of the current part 70, and since the
     proposal for part 71 would result in a total cost to
     industry of no more than $72 million in any one year, the
     requirement for a budgetary impact statement does not apply. 
     As a result of extensive public comment on the August 1994
     proposal, the Agency considered alternatives for a permit
     revision system and selected an approach that provides a
     streamlined and flexible system that is the most cost-
     effective and least burdensome while continuing to meet the
     requirements of title V.  Because small governments will not
     be significantly or uniquely affected by this rule, other
     than to reduce costs of operating permit programs they have
     opted to administer, the Agency is not required to develop a
     plan with regard to small governments.
     
     List of Subjects in 40 CFR Part 70 and Proposed 40 CFR
     Part 71
          Air pollution control, Prevention of significant
     deterioration, New source review, Fugitive emissions,
     Particulate matter, Volatile organic compounds, Nitrogen
     dioxide, Carbon monoxide, Hydrocarbons, Lead, Operating
     permits.
     
          Dated:
     
     (Signature of Administrator)
     
     
                                                     
     Administrator
               For the reasons set out in the preamble, part 51 of
     title 40, chapter I of the Code of Federal Regulations is
     proposed to be amended as set forth below.
     
     Part 51 - REQUIREMENTS FOR PREPARATION, ADOPTION, AND
     SUBMITTAL OF IMPLEMENTATION PLANS
     
     1.  The authority cite for part 51 continues to read as
     follows:
     
          Authority:  42 U.S.C. 7410(a)(2), 7475(e), 7502(a) and
     (b), 7503, 7601(a)(1), and 7620.
     
     2.  Section 51.160 is amended by adding a new paragraph (g)
     to read as follows:
     
      51.160  Legally enforceable procedures.
     *   *   *   *   *
          (g)  All terms used in  51.160 and 51.164 of this
     part shall have the same meaning as set forth elsewhere in
     relevant sections of subpart I of this part, or in the Act,
     as appropriate.
     
     3.  Section 51.161 is amended by adding the words "an
     adequate" between the words "provide" and "opportunity" in
     the first sentence of paragraph (a); by revising paragraphs
     (b), (c) and (d); and by adding a new paragraph (e).  The
     additions and revisions are set out to read as follows:
     
      51.161  Public availability of information.
     *   *   *   *   *
          (b)  The following requirements shall apply for
     purposes of paragraph (a) of this section.
          (1)  Opportunity for public comment as defined in
     paragraph (b)(2) of this section shall be provided for:
          (i)  The construction or modification of any stationary
     source that is subject to permitting requirements as a major
     source or major modification under part C or part D of
     title I; and
          (ii)  Any physical change or change in the method of
     operation of a part 70 source associated with a project
     where the prospective emissions increases from such changes,
     considered by themselves, would be a significant emissions
     increase of any pollutant subject to regulation under part C
     or D of the Act.
          (2)  The opportunity for public comment shall include,
     as a minimum:
          (i)  Availability for public inspection in at least one
     location in the area affected of the information submitted
     by the owner or operator and of the State or local agency's
     analysis of the effect on air quality;
          (ii)  A 30-day period for submittal of pubic comment;
     and
          (iii)  A notice in the affected area specifying the
     location of the relevant source information.
          (c)  For other construction or modification activities
     subject to this section, but not subject to paragraph (b) of
     this section, the program may vary the procedures for, and
     timing of, public review in light of the environmental
     significance of the activity.  The permitting authority may
     designate, subject to EPA approval under this paragraph or
     in the State's part 70 program, certain categories of
     changes as being de minimis.  For such de minimis changes,
     the State may forego altogether review by the public.
          (d)  Availability of the notice required by paragraph
     (b) of this section must also be provided to the
     Administrator through the appropriate Regional Office, and
     to all other State and local air pollution control agencies
     having jurisdiction in the region in which such new or
     modified installation will be located.  The notice also must
     be provided to any other agency in the region having
     responsibility for implementing the procedures required
     under this subpart.
          (e)  Notwithstanding the preceding paragraphs in this
     section, for changes constituting modification activities at
     part 70 sources subject to  51.160 of this part, the
     requirements of paragraph (a) of this section shall be
     considered to be met for the change if the part 70 permit
     for the source is subjected to revision procedures approved
     by EPA as meeting the public participation requirements of
     40 CFR 70.7(e) of this chapter for the change.
     
     
     
          For the reasons set out in the preamble, part 70 of
     title 40, chapter I of the Code of Federal Regulations is
     proposed to be amended as set forth below.
     
     Part 70 - STATE OPERATING PERMIT PROGRAMS
     
          1.  The authority cite for part 70 continues to read as
     follows:
     
          Authority:  42 U.S.C. 7401, et seq.
     
          2.  Section 70.2 is amended by:
          a.  Adding the words "except that research and
     development activities shall be treated as belonging to a
     separate industrial grouping" at the end of the last
     sentence in the first paragraph of the definition of "Major
     source;"
          b.  Revising the definitions of "Draft permit;"
     "Part 70 program or State program;" "Proposed Permit;"
     paragraphs (1), (2)(viii), and (2)(xxvii) of the definition
     of "Major source;" and paragraph (5) of the definition of
     "Regulated air pollutant;" and
          c.  Adding definitions of "Advance NSR,"  "Alternative
     operating scenarios," "Emissions Cap permit," "Eligible
     Indian Tribe," "Indian Tribe," "Plantwide applicability
     limit (PAL)," "Research and development activities," "State
     review program," and "Title I modification."
          Additions and revisions are set out to read as follows:
     
      70.2  Definitions
     *   *   *   *   *
          Advance NSR means terms or conditions in a part 70
     permit setting forth requirements applicable to new units or
     modifications under applicable major or minor NSR programs
     or regulations implementing section 112(g) of the Act, so
     that such changes may be operated without having to obtain a
     part 70 permit revision.
          Alternative operating scenarios means terms or
     conditions in a part 70 permit which assure compliance with
     different modes of operation for which a different
     applicable requirement applies and for which the source is
     designed to accommodate.
          Draft permit or draft permit revision means the version
     of the permit or permit revision for which the permitting
     authority offers public participation as provided under
      70.7 of this part.
          Emissions Cap permit means a part 70 permit that
     contains one or more federally-enforceable emissions
     limitations that meets the requirement for permit content
     contained in  70.4(b)(12) of this part, including a PAL
     and/or an advance NSR condition.
          Eligible Indian Tribe means an Indian Tribe that EPA
     has determined to meet the requirements of section 301(d)(2)
     of the Act or 40 CFR part 49.  [NOTE TO READER:  40 CFR part
     49 are proposed regulations (59 FR 43956 (August 25, 1994))]
     *   *   *   *   *
          Indian Tribe has the meaning defined in section 302(r)
     of the Act.
          Major source * * *
          (1)  * * *
          (i)  For pollutants other than radionuclides, any
     stationary source or group of stationary sources located
     within a contiguous area and under common control that emits
     or has the potential to emit, in the aggregate, 10 tons per
     year (tpy) or more of any hazardous air pollutant (HAP)
     (including any fugitive emissions of such pollutant) which
     has been listed pursuant to section 112(b) of the Act, 25
     tpy or more of any combination of such hazardous air
     pollutants (including any fugitive emissions of such
     pollutants), or such lesser quantity as the Administrator
     may establish by rule.  Notwithstanding the preceding
     sentence:
          (A)  Emissions from any oil or gas exploration or
     production well (with its associated equipment) and
     emissions from any pipeline compressor or pump station shall
     not be aggregated with emissions from other similar units,
     whether or not such units are in a contiguous area or under
     common control, to determine whether such units or stations
     are major sources; and
          (B)  Research and development activities may be
     considered separately for purposes of determining whether a
     major source is present, and need not be aggregated with
     collocated stationary sources unless the research and
     development activities contribute to the product produced or
     service rendered by the collocated sources in a more than de
     minimis manner; or
          (ii)  For radionuclides, "major source" shall have the
     meaning specified by the Administrator by rule.
          (2)  * * *
          (viii)  Municipal incinerators (or combinations
     thereof) capable of charging more than 50 tons of refuse per
     day;
     *   *   *   *   *
          (xxvii)  Any other stationary source category regulated 
     under section 111 or 112 of the Act and for which the
     Administrator has made an affirmative determination under
     section 302(j) of the Act."
     *   *   *   *   *
          Part 70 program, State program, or program means a
     program approved by the Administrator under this part.
     *   *   *   *   *
          Plantwide applicability limit (PAL) means a federally-
     enforceable emissions limitation established for a source to
     limit its potential to emit for a particular pollutant to a
     level at or below which a particular applicable requirement
     would not apply.
     *   *   *   *   *
          Proposed permit or proposed permit revision means the
     version of a permit or permit revision that the permitting
     authority proposes to issue and forwards to the
     Administrator for review in compliance with  70.8 of this
     part.
     *   *   *   *   *
          Regulated air pollutant * * *
          (5)  Any pollutant subject to a standard promulgated
     under section 112 or other requirements established under
     section 112 of the Act, including sections 112(g) and (j) of
     the Act, including the following:
     *   *   *   *   *
          Research and development activities means activities
     conducted to test more efficient production processes or
     methods for preventing or reducing adverse environmental
     impacts, provided that the activities do not include the
     production of an intermediate or final product for sale or
     exchange for commercial profit, and activities conducted at
     a research or laboratory facility that is operated under the
     close supervision of technically trained personnel the
     primary purpose of which is to conduct research and
     development into new processes and products and that is not
     engaged in the manufacture of products for sale or exchange
     for commercial profit, except in a de minimis manner.
     *   *   *   *   *
          State review program means a program established under
     section 112(g) of the Act, parts C and D of the Act (i.e.,
     major NSR), or section 110(a)(2)(C) of the Act (i.e., minor
     NSR) and any other State program approved by EPA as such.  A
     State review program need not entail review and approval of
     all source changes subject to the program, but may regulate
     categories of source changes by means of general rules or
     general permits as appropriate.
     *   *   *   *   *
          Title I modification or modification under any
     provision of title I of the Act means any modification under
     parts C and D of title I or sections 111(a)(4), 112(a)(5),
     or 112(g) of the Act; under regulations promulgated by EPA
     thereunder or in  61.07 of part 61 of this chapter; or
     under State regulations approved by EPA to meet such
     requirements.
     *   *   *   *   *
     
          3.  Section 70.4 is amended by:
          a.  Revising the heading;
          b.  Adding introductory text after the heading;
          c.  Revising paragraphs (b), (b)(3), (b)(3)(x),
     (b)(3)(xi), (b)(6), (b)(11)(ii), (b)(12)(i), (d)(1),
     (d)(3)(iv), (e), (e)(1), and (e)(2);
          d.  Adding a new paragraph (b)(3)(xiv);
          e.  Adding to the end of paragraph (a) the following
     sentence, "Indian Tribes are not required to submit part 70
     programs to EPA for approval, but may elect to do so.";
          f.  Adding the phrase ", Tribal," after the words
     "copies of all applicable State" in the first sentence of
     paragraph (b)(2);
          g.  Adding the words "or tribal" after the words
     "judicial review in State" in the first and second sentences
     of paragraph (b)(3)(xi);
          h.  Adding the words "Except for Tribal programs" to
     the beginning of the first sentence in paragraph (b)(12);
          i.  Deleting paragraphs (b)(12)(iii), (b)(14), and
     (b)(15); and
          j.  Redesignating paragraph (b)(16) as (b)(14).
          Additions and revisions are set out to read as follows:
     
      70.4  State and Tribal program submittals and transition.
          Eligible Indian Tribes may administer programs meeting
     the requirements of this section.  Unless otherwise
     indicated, references to "States" and "Governors" in this
     section shall include, as appropriate, "Tribal programs,"
     "Indian Tribes," and "Indian governing bodies."
     *   *   *   *   *
          (b)  Elements of the initial program submission.  Any
     State or Indian Tribe that seeks to administer a program
     under this part shall submit to the Administrator a letter
     of submittal from the Governor or his or her designee or
     from the governing body of an Indian Tribe requesting EPA
     approval of the program and at least three copies of a
     program submission.  The submission shall contain the
     following:
     *   *   *   *   *
          (3)  A legal opinion from the Attorney General for the
     State, the Tribal attorney, or the attorney for those State,
     Tribal, local, or interstate air pollution control agencies
     that have independent legal counsel, stating that the laws
     of the State, locality, Indian Tribe, or interstate compact
     provide adequate authority to carry out all aspects of the
     program.  This statement shall include citations to the
     specific statutes, administrative regulations, and, where
     appropriate, judicial decisions that demonstrate adequate
     authority.  State statutes and regulations cited by the
     State Attorney General, Tribal attorney, or independent
     legal counsel shall be in the form of lawfully adopted State
     or Tribal statutes and regulations at the time the statement
     is signed and shall be fully effective by the time the
     program is approved.  To qualify as "independent legal
     counsel," the attorney signing the statement required by
     this section shall have full authority to independently
     represent the State or Tribal agency in court on all matters
     pertaining to the State or Tribal program.  The legal
     opinion shall also include a demonstration of adequate legal
     authority to carry out the requirements of this part,
     including authority to carry out each of the following:
     *   *   *   *   *
          (x)  Provide an opportunity for judicial review in
     State or Tribal court of the final permit action by the
     applicant, any person who participated in the public
     participation process provided pursuant to  70.7 and any
     other person who could obtain judicial review of such
     actions under State or Tribal laws.
     *   *   *   *   *
          (xiv)  Issue emissions cap permits pursuant to
      70.4(b)(12)(i) including advance NSR conditions consistent
     with all applicable requirements.
     *   *   *   *   *
          (6)  A showing of adequate authority and procedures to
     determine within 60 days of receipt whether applications
     (including renewal applications) are complete, to request
     such other information as needed to process the application,
     and to take final action on complete applications within 18
     months of the date of their submittal, except for initial
     permit applications, for which the permitting authority may
     take up to 3 years, or up to 5 years for Tribal programs,
     from the effective date of the program to take final action
     on the application, as provided for in the transition plan.
     *   *   *   *   *
          (11)  * * *
          (ii)  Final action shall be taken on at least one-third
     of such applications annually over a period not to exceed 3
     years after such effective date, except for Tribal programs
     for which the transition period will be for a period agreed
     upon jointly by the Tribe and the appropriate EPA Regional
     Office not to exceed 5 years;
     *   *   *   *   *
          (12)  * * *
          (i)  Trading under permitted emissions caps.  The
     program shall require the permitting authority to include in
     a permit an emissions cap, pursuant to a request submitted
     by the applicant, consistent with any specific emissions
     limits or restrictions otherwise required in the permit by
     any applicable requirements, and permit terms and conditions
     for emissions trading solely for the purposes of complying
     with that cap, provided that the permitting authority finds
     that the request contains adequate terms and conditions,
     including all terms required under  70.6(a) and (c) of
     this part, to determine compliance with the cap and with any
     emissions trading provisions.  The permit shall also contain
     terms and conditions to assure compliance with all
     applicable requirements.  The permit applicant shall include
     in its application proposed replicable procedures and permit
     terms that ensure the emissions cap is enforceable and
     trades pursuant to it are quantifiable and enforceable.  Any
     permit terms and conditions establishing such a cap or
     allowing such trading may be established only in procedures
     for permit issuance, renewal, or permit revision pursuant to
      70.7(e)(2)(vi).  The permitting authority shall not be
     required to include in the cap or emissions trading
     provisions any emissions units where the permitting
     authority determines that the emissions are not quantifiable
     or where it determines that there are no replicable
     procedures or practical means to enforce the emissions
     trades.
          (A)  Under this paragraph (b)(12)(i), the written
     notification required by  70.4(b)(12) shall state when the
     change will occur and shall describe how increases and
     decreases in emissions will comply with the terms and
     conditions of the permit.  The written notification
     requirement for the first and all subsequent changes may be
     met by submitting a single notice at least 7 days in advance
     of the first change allowed by the terms of the emissions
     cap permit.
          (B)  The permit shield described in  70.6(f) of this
     part may extend to terms and conditions that allow such
     increases and decreases in emissions.
     *   *   *   *   *
          (d)  Interim approval.  (1)  If a program (including a
     partial permit program but not including Tribal programs)
     submitted under this part substantially meets the
     requirements of this part, but is not fully approvable, the
     Administrator may by rule grant the program interim
     approval.
     *   *   *   *   *
          (3)  *  *  *
          (iv)  Public participation.  The program must provide
     for adequate public notice of and an opportunity for public 
     participation on draft permits, reopenings for cause, and
     revisions as required by  70.7 of this part, except for:
          (A)  Modifications qualifying for minor permit
     modification procedures under  70.7(e) of this part as
     promulgated July 21, 1992; and
          (B)  Permit revisions to incorporate changes subject to
     minor NSR processed under  70.7(e)(2) of this part as
     promulgated [date of final rulemaking].
          (e)  EPA review of permit program submittals.  Within
     1 year after receiving a program submittal, the
     Administrator shall approve or disapprove the program, in
     whole or in part, by publishing a notice in the FEDERAL
     REGISTER, except that no Tribal program will be disapproved. 
     Prior to such notice, the Administrator shall provide an
     opportunity for public comment on such approval or
     disapproval.  Any EPA action disapproving a program, in
     whole or in part, shall include a statement of the revisions
     or modifications necessary to obtain full approval.  The
     Administrator shall approve State programs and programs to
     be administered by eligible Indian Tribes that conform to
     the requirements of this part.
          (1)  Within 60 days of receipt by EPA of a State
     program submission, EPA will notify the State or Indian
     Tribe whether its submission is complete enough to warrant
     review by EPA for either full, partial, or interim approval,
     except that no Tribal program will be considered for interim
     approval.  If EPA finds that a State's or Indian Tribe's
     submission is complete, the 1-year review period (i.e., the
     period of time allotted for formal EPA review of a proposed
     State or Tribal program) shall be deemed to have begun on
     the date of receipt of the State's or Indian Tribe's
     submission.  If EPA finds that a State's or Indian Tribe's
     submission is incomplete, the 1-year review period shall not
     begin until all the necessary information is received by
     EPA.
          (2)  If the State's or Indian Tribe's submission is
     materially changed during the 1-year review period, the
     Administrator may extend the review period for no more than
     1 year following receipt of the revised submission.
     *   *   *   *   *
     
          3.  Section 70.5 is amended by adding the following
     language to the end of paragraph (d) to read as follows:
     
           70.5  Permit applications.
     *   *   *   *   *
          (d)  * * *  The responsible official shall certify, by
     his or her signature, the following statement:  "I certify
     under penalty of law that I above personally examined, and
     am familiar with, the statements and information submitted
     in this document and all of its attachments.  Based on my
     inquiry of those individuals with primary responsibility for
     obtaining the information, I certify that the statements and
     information are to the best of my knowledge and belief true,
     accurate, and complete.  I am aware that there are
     significant penalties for submitting false statements and
     information or omitting required statement and information,
     including the possibility of fine or imprisonment."
     
          4.  Section 70.6 is amended by adding a new paragraph
     (a)(1)(iv); by adding the words "Except for Tribal programs"
     to the beginning of the first sentence in paragraphs (a)(8),
     (a)(9), and (a)(10); and by revising paragraph (g)(2).  The
     additions are set out to read as follows:
     
           70.6  Permit content.
          (a)  * * *
          (1)  * * *
          (iv)  With respect to applicable requirements under
     section 112(r)(7) of the Act, the inclusion of permit
     conditions in accordance with regulations promulgated under
     section 112(r) shall satisfy the requirements of paragraph
     (a)(1) of this section.
     *   *   *   *   *
          (g) * * *
          (2)  A State may provide for an affirmative defense
               available in an action brought for noncompliance with
               technology-based emissions limitations established only
               in the part 70 permit.  Such an affirmative defense may
               be available only if the conditions of paragraph (g)(3)
               of this section are met.
     *   *   *   *   *
     
          5.  Section 70.7 is amended by redesignating paragraphs
     (f), (g), and (h) as paragraphs (i), (j), and (k)
     respectively; revising paragraphs (d) and (e); and adding
     new paragraphs (f), (g), and (h).  The additions and
     revisions are set out to read as follows:
     
           70.7  Permit issuance, renewal, reopenings, and
     revisions.
     *   *   *   *   *
          (d)  General Requirements For Permit Revisions.
     (1)  Changes requiring permit revision.  Changes at a source
     requiring a revision of a part 70 permit are those that:
          (i)  Could not be operated without violating an
     existing permit term; or
          (ii)  Render the source subject to an applicable
     requirement to which the source has not been previously
     subject.
          (2)  Program provisions.  The program shall provide for
     adequate, streamlined, and reasonable procedures for
     expeditiously processing permit revisions.  The State or
     Indian Tribe may meet this obligation by adopting the
     procedures set forth in  70.7(e) and (f) of this part or
     ones that are approved by EPA as substantially equivalent.
          (3)  Exemption for acid rain.  A permit revision for
     purposes of the acid rain portion of the permit shall be
     governed by regulations promulgated under title IV of the
     Act.
          (4)  Public notice and access.  For all part 70 permit
     revisions for which an opportunity for public comment is not
     provided prior to the change, the program shall provide in a
     general manner for periodic notification to the public on at
     least a quarterly basis and for public access to the records
     regarding such revisions.
          (e)  Permit revisions for changes subject to a State
     review program.  (1)  Applicability.  The following changes
     shall be incorporated into part 70 permits using the permit
     revision procedures set forth in paragraph (e)(2) of this
     section as changes with prior review.
          (i)  More environmentally significant changes subject
     to a State review program.  The more environmentally
     significant changes subject to a State review program shall
     be defined in the program and shall include at a minimum the
     following:
          (A)  Any change subject to major NSR;
          (B)  Any physical change or change in the method of
     operation of a part 70 source associated with a project
     where the prospective emissions increases from such changes,
     considered by themselves, would be a significant emissions
     increase of any pollutant subject to regulation under part C
     or D of the Act;
          (C)  Any change subject to prior public and EPA review
     under regulations implementing section 112(g) of the Act;
     and
          (D)  Any other category of changes subject to prior
     public and EPA review the permitting authority determines in
     its program to have a similarly significant environmental
     impact.
          (ii)  Less environmentally significant changes subject
     to a State review program.  Less environmentally significant
     changes in this category include all changes subject to the
     State's minor NSR program (established pursuant to 40 CFR
     51.160), except for those changes described in paragraph
     (e)(1)(i)(B) of this section, all source-specific SIP
     revisions, and any other changes approved by EPA in the
     program as such.
          (2)  Procedures.  The program shall provide that for
     each change subject to a State review program:
          (i)  In the context of the State review program, an
     adequate opportunity is afforded for review by the public,
     EPA, and affected States of any revisions to the part 70
     permit.
          (ii)  Except as provided in paragraph (e)(2)(viii) of
     this section, a document or combination of documents is
     issued by the permitting authority that describes any new or
     different applicable requirement(s) to which the change is
     subject and any resulting changes or additions to existing
     part 70 permit terms necessary to meet the permit content
     requirements of  70.6(a) and (c) of this part.
          (iii)  The permitting authority shall revise the
     part 70 permit upon issuance of any document described in
     paragraph (e)(2)(ii) of this section or receipt of any
     notice described in paragraph (e)(2)(viii) of this section
     by immediately attaching the document to the part 70 permit. 
     Such document may be any preconstruction permit under minor
     or major NSR, any source specific SIP revision, or any
     action subject to prior public and EPA review taken under
     regulations implementing section 112 (g) of the Act.
          (iv)  The provisions of paragraph (e)(2)(iii) of this
     section do not apply with respect to a unitary permit
     program provided the unitary permit has already incorporated
     all new or different applicable requirements and contains
     sufficient terms or conditions to meet the permit content
     requirements of  70.6(a) and (c) of this part.  For
     purposes of this part, a unitary permit means a single
     permit which contains all terms and conditions needed to
     meet the requirements of part 70 and the requirements of
     major or minor NSR or regulations implementing section
     112(g) of the Act.
          (v)  Except as provided by paragraph (e)(2)(viii) of
     this section, the source may not operate a change until the
     permitting authority has revised the part 70 permit or
     issued a unitary permit, as applicable.
          (vi)  For the more environmentally significant changes
     subject to a State review program, the program shall ensure
     that:
          (A)  The public, EPA, and affected States receive
     notice of, and opportunity to comment on, the part 70 permit
     revision consistent with the provisions setting forth prior
     review to which the change is subject; and
          (B)  The opportunity for comment extends to the draft
     part 70 permit terms as needed to revise existing part 70
     permit terms and to meet the permit content requirements of
      70.6(a) and (c) of this part.
          (vii)  For less environmentally significant changes
     described under paragraph (e)(1)(ii) of this section, and
     for the purpose of determining adequate opportunity for
     review for the purpose of paragraph (e)(2)(i) of this
     section with respect to such changes, the program may vary
     the procedures for, and timing of, public, EPA, and affected
     State review in light of the environmental significance of
     the change.  The permitting authority may designate in its
     program certain categories of changes, subject to EPA
     approval, as de minimis changes.  The permitting authority
     may postpone until renewal of the affected part 70 permit
     review by the public, EPA, and affected States for such de
     minimis changes.
          (viii)  For those changes which a State review program
     allows a source to make in accordance with specified
     requirements without obtaining prior permitting authority
     review and approval, the source shall submit to the
     permitting authority upon operating the change a notice
     describing the change and setting forth the applicable
     requirement(s) to which the change is subject and the
     part 70 permit terms required by  70.6(a) and (c) of this
     part.  The notice shall also state that the source upon
     making the change will meet all applicable requirements and
     that the relevant requirements of part 70 have been met. 
     Upon submitting the notice, the source shall attach a copy
     of it to its part 70 permit.  This action shall revise the
     permit to the extent that operation of the change does not
     conflict with any existing permit term.  Where a conflict
     exists, the source may not revise its permit pursuant to
     this provision and may not operate the change until its
     permit is revised.
          (3)  Program provisions.  The program may provide for
     changes that are reviewed under a State review program to be
     processed under the procedures in paragraph (e)(2) of this
     section pursuant to regulations implementing either title V
     or title I of the Act provided that any procedures under
     title V are concurrent with any procedures under title I.
          (f)  Permit revisions for changes not subject to a
     State review program.  (1)  Applicability.  Changes not
     otherwise reviewed by a State shall be incorporated into
     part 70 permits using the permit revision procedures set
     forth in paragraph (f)(2) of this section.
          (i)  More environmentally significant changes not
     subject to a State review program.  The more environmentally
     significant changes in this category shall be defined in the
     program and shall include at a minimum the establishment or
     revision of the following if they are not otherwise reviewed
     by the State.
          (A)  MACT determinations made under regulations
     implementing section 112(j) of the Act;
          (B)  Alternative emission limits established under
     regulations implementing section 112(i)(5) of the Act;
          (C)  Alternative requirements established under
      70.6(a)(1)(iii) of this part or under substitute section
     112 standards established pursuant to a program approved by
     EPA for such purpose under section 112(l) of the Act;
          (D)  (Establishment only) restrictions on the potential
     to emit of an entire source including those for the purpose
     of establishing minor source status under title I of the
     Act; and
          (E)  Changes involving new or alternative monitoring
     methods that have not been authorized as adequate for
     measuring compliance under major or minor NSR, under
     regulations implementing section 112(g) of the Act, or under
     any other equivalent procedures.
          (ii)  Less environmentally significant changes not
     subject to a State review program.  Less environmentally
     significant changes in this category are those approved by
     EPA in the program as such and include as a minimum the
     establishment or revision of the following if they are not
     subject to a State review program.
          (A)  Alternative operating scenarios;
          (B)  Monitoring terms not made or addressed in
     association with the processing of changes pursuant to
      70.7(e) of this part; and
          (C)  (Revision only) restrictions on the potential to
     emit of an entire source including those for the purpose of
     establishing minor source status under title I of the Act;
     and
          (D)  Emissions averaging restrictions to meet a
     standard set under section 112(d) of the Act.
          (2)  Procedures.  For changes described in paragraph
     (f)(1) of this section, the program shall provide that for
     each change not subject to a State review program:
          (i)  An adequate opportunity occurs for review by the
     public, EPA, and affected States to address the change and
     any associated revisions to the source's part 70 permit.
          (ii)  The terms of the permit revision will be
     sufficient to assure compliance with all applicable
     requirements and the permit content requirements of
      70.6(a) and (c) of this part.
          (iii)  Unless specified otherwise in this paragraph,
     the source may not operate the change until the permitting
     authority has revised the part 70 permit.
          (iv)  The more environmentally significant changes
     described in paragraph (f)(1)(i) of this section shall be
     reviewed pursuant to procedural requirements applicable to
     initial permit issuance in paragraph (a)(1) of this section,
     except that the permitting authority shall complete review
     of the majority of these changes within 6 months after
     receipt of a complete application.
          (v)  For other changes described in paragraph
     (f)(1)(ii) of this section, and for the purpose of
     determining adequate opportunity for review for the purpose
     of paragraph (f)(2)(i) of this section with respect to such
     changes, the program may vary the procedures for, and the
     timing of, public, EPA, and affected State review in light
     of the environmental significance of the change.
          (A)  The permitting authority may postpone until
     renewal of the affected part 70 permit review by the public,
     EPA, and affected States for changes that are approved by
     EPA in its part 70 program as being de minimis.  The
     following changes may be incorporated into permits using the
     procedures in paragraph (f)(2)(v)(B) of this sections:
          (1)  Correcting typographical errors;
          (2)  Making minor administrative changes, such as a
     change in the name, address, or phone number of any person
     identified in the permit;
          (3)  Requiring more frequent monitoring, recordkeeping,
     or reporting by the permittee;
          (4)  Allowing for a change in ownership or operational
     control of a source where the permitting authority
     determines that no other change in the permit is necessary,
     provided that a written agreement containing a specific date
     for transfer of permitting responsibility, coverage, and
     liability between the current and new permittee has been
     submitted to the permitting authority;
          (5)  Incorporating a compliance schedule from an
     applicable requirement with a future compliance date
     promulgated after permit issuance; or
          (6)  Incorporating any other type of change which the
     State determines, and the Administrator approves, as de
     minimis.
          (B)  For changes described in paragraph (f)(2)(v)(A) of
     this section, the permittee or the permitting authority may
     initiate the administrative incorporation into the permit by
     issuing a notice describing what information in the part 70
     permit is affected by such a change and sending the notice
     to the permitting authority or the permittee as appropriate.
          (1)  Where the source issues a notice, the permit shall
     be revised upon mailing of the notice by the source to the
     permitting authority by certified mail.
          (2)  Where the permitting authority issues a notice,
     the permit shall be revised upon its attachment to the
     permit.
          (3)  The program may provide that changes described in
     paragraph (f)(2)(v)(A) of this section may be implemented
     prior to issuance of the notice or revision of the part 70
     permit.
          (C)  For changes which trigger a new or different
     applicable requirement but which a source can make without
     obtaining permitting authority approval, the program shall
     provide that:
          (1)  The source shall submit to the permitting
     authority upon operating the change a notice that:
          (A)  Describes the change;
          (B)  Sets forth the applicable requirement(s) to which
     the change is subject;
          (C)  Sets forth the part 70 permit terms necessary to
     meet the permit content requirements of  70.6(a) and (c)
     of this part; and
          (D)  States that the source upon making the change will
     meet all applicable requirements and that the relevant
     requirements of part 70 have been met;
          (2)  The source's mailing of the notice by certified
     mail to the permitting authority shall revise the permit,
     provided that operation of the change does not conflict with
     any existing permit term.  Where a conflict exists, the
     permitting authority shall not revise the permit pursuant to
     this provision and the source shall not operate the change
     until its permit is revised pursuant to applicable
     procedures in  70.7(f) of this part.
          (3)  Combination changes.  Notwithstanding the
     provisions of paragraph (f)(2) of this section, changes
     described in paragraph (f)(1) of this section may be
     combined with changes described in paragraph (e)(1) of this
     section and processed using the procedures of paragraph
     (e)(2) of this section, provided the procedures to which the
     changes under paragraph (f)(1) of this section would have
     been subject under paragraph (f)(2) of this section are
     provided in procedures pursuant to paragraph (e)(2) of this
     section.
          (g)  Permit shield.  The permit shield under  70.6(f)
     of this part may be granted by the permitting authority
     prior to permit renewal only for:
          (1)  Any change defined pursuant to  70.7(e)(1)(i) or
     70.7(f)(1)(i) of this part;
          (2)  Any change to which the Administrator has objected
     as a result of a petition filed under  70.8(d) of this
     part, except that the permit shield may be granted only to
     permit terms that are revised or added as a result of EPA's
     objection; and
          (3)  Any change defined pursuant to  70.7(e)(1)(ii)
     or (f)(1)(ii) for which public and EPA review has occurred.
     
     6.  Section 70.8 is amended by revising the title; by 
     revising paragraphs (a)(1), (b), (c)(1), (c)(2),
     (c)(3)(iii), and (d); by adding introductory text to
     paragraph (c); by adding new paragraphs (c)(5) and (c)(6);
     and by revising the first sentence in paragraph (e).  The
     additions and revisions are set out to read as follows:
     
      70.8  Permit review by EPA, affected States, and Indian
     Tribes.
          (a)  Transmission of information to the Administrator.
     (1)  (i)  For permits and permit renewals, the part 70
     program shall require that the permitting authority provide
     to the Administrator a copy of each permit application, each
     proposed permit, and each final part 70 permit.
          (ii) For permit revisions for changes that are subject
     to a State review program and that meet the definition of
     more environmentally significant changes under
      70.7(e)(1)(i) of this part, the part 70 program shall
     require that the permitting authority provide to the
     Administrator a copy of each application submitted for
     purposes of the State review program and each proposed and
     final action under the State review program (including
     revisions to the part 70 permit).
          (iii)  For permit revisions for changes that are not
     subject to a State review program and that meet the
     definition of more environmentally significant under
      70.7(f)(1)(i) of this part, the part 70 program shall
     require that the permitting authority provide to the
     Administrator a copy of each permit revision application,
     and each proposed and final permit revision.
          (iv)  For permit revisions that are defined as de
     minimis under the part 70 program and approved by EPA under
      70.7 of this part, no permit applications or permit
     revisions are required to be submitted to the Administrator.
          (v)  For all permit revisions other than those referred
     to in paragraphs (ii) through (iv) of this section, the
     part 70 program shall require that the permitting authority
     provide to the Administrator a copy of each relevant permit
     application or summary thereof, and a copy of each final
     part 70 permit revision.
          (vi)  For any permit or permit revision, upon agreement
     with the Administrator, the permitting authority may submit
     to the Administrator an application summary form and any
     relevant portion of the application and compliance plan, in
     place of the complete application and compliance plan.  To
     the extent practicable, information submitted to the
     Administrator shall be provided in computer readable format
     compatible with EPA's national database management system.
     *   *   *   *   *
          (b)  Review by affected States.
          Eligible Indian Tribes may be considered affected
     States under this paragraph.  Indian Tribes are not required
     to submit a part 70 program for the limited purpose of being
     considered an affected State under this paragraph.
          (1)  For purposes of paragraph (b) of this section, an
     Indian Tribe will be considered an affected State if it
     administers a tribal program and otherwise meets the
     definition of "affected State" set forth in  70.2 of this
     part.
          (2)  The permit program shall provide that the
     permitting authority give notice of each draft permit or
     draft permit revision (including any proposed action
     pursuant to a prior State review program, as relevant) to
     any affected State on or before the time that the permitting
     authority provides this notice to the public under  70.7 of
     this part.  Where  70.7 does not require prior public
     notice of a permit revision, the permitting authority shall
     give notice of the final permit revision on or before the
     time that the permitting authority provides this notice to
     the public under  70.7.
          (3)  The permit program shall provide that the
     permitting authority, as part of the submittal of any
     proposed permit or proposed permit revision to the
     Administrator, shall notify the Administrator and any
     affected State in writing of any refusal by the permitting
     authority to accept all recommendations for the proposed
     permit that the affected State submitted during the public
     and affected State review period.  The notice shall include
     the permitting authority's reasons for not accepting any
     such recommendation.  The permitting authority is not
     required to accept recommendations that are not based on
     applicable requirements or the requirements of this part.
          (c)  EPA objection.  For purposes of State programs
     approved under part 70 as promulgated on July 21, 1992,
      70.8(c) of this part as promulgated on July 21, 1992 shall
     apply.  For purposes of State programs approved under
     part 70 as revised on [date of final rulemaking],  70.8(c)
     of this part as promulgated on [date of final rulemaking]
     shall apply.
          (1)  Except as provided by paragraphs (c)(5) and (6) of
     this section, the Administrator will object to the issuance
     of any proposed permit or any permit revision determined by
     the Administrator not to be in compliance with applicable
     requirements or requirements under this part.  No permit or
     permit revision for which an application must be transmitted
     to the Administrator under paragraph (a) of this section
     shall be issued if the Administrator objects to its issuance
     in writing during the 45-day period following:
          (i) In the case of initial permit issuance, permit
     renewals, and permit revisions for changes as defined under
      70.7(f)(1)(i) of this part, receipt of the proposed permit
     or proposed permit revision and all necessary supporting
     information; or
          (ii) In the case of permit revisions for changes as
     defined under  70.7(e)(1)(i) of this part, the beginning of
     the public comment period for such revisions (although the
     Administrator may object within 45 days of receipt of the
     final permit revision for defects that were not reasonably
     apparent in the draft permit submitted for public review).
          (2)  Any EPA objection under this section shall include
     a statement of the Administrator's reasons for objection and
     a description of the terms and conditions that the permit
     must include to respond to the objections.  The
     Administrator will provide the permittee a copy of the
     objection.
          (3)  * * *
          (iii)  Process the permit or permit revision under the
     procedures approved to meet  70.7 of this part.
     *   *   *   *   *
          (5)  For 5 years following approval of the part 70
     program implementing this paragraph, the Administrator shall
     not object to a permit revision for a change as defined
     under  70.7 (e)(1)(ii) or  (f)(1)(ii) of this part except
     where it is in response to a petition filed pursuant to
     paragraph (d) of this section, and the permit revision
     contains an error that would, either alone or in combination
     with other similar permit revisions likely to be issued,
     likely have a significant adverse environmental effect.  A
     permit revision would be deemed to have a significant
     adverse environmental impact if it were employed as a device
     to limit potential to emit below major source or major
     modification thresholds (as set forth in title I of the Act)
     but in the Administrator's judgment would allow increases
     above those thresholds.
          (6)  The Administrator shall not object to any permit
     revision for a change approved by EPA in a part 70 program
     as de minimis.
          (d)  Public petitions to the Administrator.  (i)  The
     program shall provide that, if the Administrator does not
     object in writing by the expiration of the applicable 45-day
     review period specified in paragraph (c) of this section,
     any person may petition the Administrator to make such
     objection within 60 days after the expiration of the
     applicable review period, or, for all permit revisions for
     changes as defined under  70.7(e)(1)(ii) or (f)(1)(ii) of
     this part (other than for de minimis changes as defined by
     the part 70 program and approved by EPA under  70.7 of this
     part), within 60 days of the date the public is notified of
     the revision of the part 70 permit.  The program shall also
     provide that the public have access to information
     concerning the beginning and expiration of EPA's 45-day
     review period as required for permit issuance, revisions,
     reopenings, and renewals pursuant to  70.7 of this part.
          (ii)  Any petition shall be based only on objections to
     the permit that were raised with reasonable specificity
     during any public comment period provided for in  70.7 of
     this part, unless the petitioner demonstrates that it was
     impracticable to raise such objections within such period,
     no public comment period was provided, or the grounds for
     such objection arose after such period.
          (iii)  If the Administrator objects to the permit as a
     result of a petition filed under this paragraph, the
     permitting authority shall not issue the permit until EPA's
     objection has been resolved, except that a petition for
     review does not stay the effectiveness of a permit or its
     requirements if the permit was issued after the end of the
     45-day review period specified in paragraph (c) of this
     section and prior to an EPA objection.
          (iv)  If the permitting authority has issued a permit
     pursuant to the procedures in  70.7(e)(1)(ii) or
     (f)(1)(ii) of this part prior to receipt of an EPA objection
     under this paragraph, the Administrator will modify,
     terminate, or revoke such permit, and shall do so consistent
     with the procedures in  70.7(e)(2) or (f)(2) of this part
     as appropriate except in unusual circumstances, and the
     permitting authority may thereafter issue only a revised
     permit that satisfies EPA's objection.  In any case, the
     source will not be in violation of the requirement to have
     submitted a timely and complete application.
          (e)  Prohibition on default issuance.  Consistent with
      70.4(b)(3)(ix) of this part, for the purposes of Federal
     law and title V of the Act, no State program may provide
     that a part 70 permit or a part 70 permit revision for a
     change as defined under  70.7(e)(1)(i) or 70.7(f)(1)(i)
     will issue until affected States and EPA have had an
     opportunity to review the permit or permit revision as
     required under this section.  *   *   *
     
          8.  Section 70.10 is amended by adding a new paragraph
     (a)(3) and by revising paragraphs (b)(1) and (c)(1). 
     Additions and revisions are set out to read as follows:
     
      70.10  Federal oversight and sanctions.
          (a)  * * *
          (3)  The requirements of paragraphs (a)(1) and (a)(2)
     of this section shall not apply to Indian Tribes and Tribal
     programs.
          (b)  * * *
          (1)  Whenever the Administrator makes a determination
     that a permitting authority is not adequately administering
     or enforcing a part 70 program, including a Tribal program,
     or any portion thereof, the Administrator will notify the
     permitting authority of the determination and the reasons
     therefore.  The Administrator will publish such notice in
     the FEDERAL REGISTER.
     *   *   *   *   *
          (c)  Criteria for withdrawal of State or Tribal
     programs.
          (1)  The Administrator may withdraw program approval in
     whole or in part whenever the approved program no longer
     complies with the requirements of this part and the
     permitting authority fails to take corrective action.  Such
     circumstances, in whole or in part, include any of the
     following:
     *   *   *   *   *
     
          9.  Section 70.11 is amended by revising the
     introductory text to read as follows:
     
      70.11  Requirements for enforcement authority.
          Except for Tribal programs, with respect to criminal
     enforcement matters only, under which the Tribe shall enter
     into a formal Memorandum of Agreement with EPA to provide
     for the timely referral of criminal enforcement matters to
     the appropriate EPA Regional Administrator, all programs to
     be approved under this part must contain the following
     provisions:
     *   *   *   *   *
     
     

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