[Federal Register Volume 59, Number 74 (Monday, April 18, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-9292]


[[Page Unknown]]

[Federal Register: April 18, 1994]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[UT4-1-5628 and UT2-1-5441; FRL-4875-1]

 

Approval and Promulgation of State Implementation Plans; Utah 
Stack Height Analyses and Regulations

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: The Governor of Utah submitted two revisions to the Utah State 
Implementation Plan (SIP): Section 16, Stack Height Demonstration, and 
Section 9, Part B, Sulfur Dioxide. Sections 16 and 9 were submitted in 
letters dated December 23, 1991, and May 15, 1992, respectively. The 
revisions to Section 16 were to address the stack-height demonstration 
requirements for the Kennecott Minerals Company Smelter near Magna, 
Utah. Minor corrections to the other stacks in the State were also 
made. Section 9, Part B was revised to be consistent with Section 16. 
Prior to the revision, the SO2 attainment demonstration for Salt 
Lake County and portions of Tooele County was based on multipoint 
rollback emission rates at the Kennecott smelter. The PM10 SIP 
adopted for Salt Lake County in 1991 established significantly lower 
emission rates (which would meet the 24-hour National Ambient Air 
Quality Standard (NAAQS) for the smelter based on reasonable available 
control technology (RACT). Section 16 and Section 9, Part B needed to 
be consistent with the PM10 SIP (the PM10 SIP is located in 
Section 9, Part A). In addition, Section 9 Part B was revised to 
include an analysis and the emission limitation that would demonstrate 
attainment of the 3-hour secondary NAAQS.

DATES: Comments must be received on or before May 18, 1994.

ADDRESSES: Written comments should be addressed to: Douglas Skie (ART--
AP) Air Programs Branch, EPA Region VIII, 999 18th St., suite 500, 
Denver, Colorado 80202-2466.
    Copies of the documents relevant to this proposed action are 
available for public inspection between 8 a.m. and 4 p.m., Monday 
through Friday, at the following office: Environmental Protection 
Agency, Region VIII, Air Programs Branch, 999-18th Street, suite 500, 
Denver, Colorado 80202-2466.

FOR FURTHER INFORMATION CONTACT: Lee Hanley, Air Programs Branch, 
Environmental Protection Agency, Region VIII, 999-18th Street, suite 
500, Denver, Colorado 80202-2466, (303) 293-1760.

SUPPLEMENTARY INFORMATION:

I. Background

A. Regulatory History

    On February 8, 1982 (47 FR 5864), EPA promulgated final regulations 
limiting stack height credits and other dispersion techniques as 
required by section 123 of the Clean Air Act (CAA). These regulations 
were challenged in the U.S. Court of Appeals for the D.C. Circuit by 
the Sierra Club Legal Defense Fund, Inc., the Natural Resources Defense 
Council, Inc., and the Commonwealth of Pennsylvania in Sierra Club v. 
EPA, 719 F.2d 436 (DC Cir. 1983). On October 11, 1983, the court issued 
its decision ordering EPA to reconsider portions of the stack height 
regulations, while upholding other portions. As a result, EPA 
promulgated revisions to the stack height regulations on July 8, 1985 
(50 FR 27892). The revisions redefined a number of specific terms 
including ``excessive concentrations,'' ``dispersion techniques,'' 
``nearby,'' and other important concepts, and modified some of the 
bases for determining good engineering practice (GEP) stack height 
credit.
    Pursuant to Section 406(d)(2) as amended in the 1977 CAA, each 
state was required to: (1) Review and revise its SIP, as necessary, to 
include provisions that limit stack height credit and other dispersion 
techniques in accordance with the revised regulations; and (2) review 
all existing emission limitations to determine whether any of these 
limitations have been affected by stack height credits greater than 
GEP, or any other dispersion techniques. For any limitations so 
affected, each state was to prepare revised limitations consistent with 
the revised stack height regulation.
    Subsequently, EPA issued detailed guidance on carrying out the 
necessary reviews. For the review of emission limitations, each state 
was to prepare an inventory of stacks greater than 65 meters in height 
and sources with emissions of sulfur dioxide (SO2) in excess of 
5,000 tons per year (tpy). These limits correspond with the de minimis 
stack height and the de minimis SO2 emission level provisions in 
the regulations. These sources were then subjected to detailed review 
for conformance with the revised federal regulations. State submissions 
were to contain an evaluation of each stack and source in the 
inventory.
    Subsequent to the July 8, 1985 promulgation, the stack height 
regulations were again challenged in NRDC v. Thomas, 838 F.2d 1224 
(D.C. Cir. 1988). On January 22, 1988, the U.S. Court of Appeals for 
the D.C. Circuit issued its decision affirming the regulations, for the 
most part, but remanding three provisions to the EPA for 
reconsideration. These are:

1. Grandfathering pre-October 11, 1983 within-formula stack height 
increases from demonstration requirements [40 CFR 51.100(kk)(2)];
2. Dispersion credit for sources originally designed and constructed 
with merged or multiflue stacks [40 CFR 51.100(hh)(2)(ii)(A)]; and
3. Grandfathering pre-1979 use of the refined H + 1.5L formula [40 
CFR 51.100(ii)(2)].

    However, none of these provisions is at issue here.

B. Regulatory Requirement for Stacks Greater Than GEP

    GEP has been established by the regulations to be the greater of: 
(1) 65 meters, (2) the height derived through application of one of two 
formulas which base GEP on the dimensions of nearby buildings, or (3) 
the height demonstration through a field study or fluid modeling 
demonstration to be necessary to avoid excessive concentrations of any 
air pollutant due to downwash, eddies, or wakes caused by the source 
itself or nearby buildings or terrain obstacles (40 CFR 51.100(ii). 
Where EPA or a State finds that a source emission limit is affected by 
dispersion from a stack in excess of GEP, the State must then model to 
establish an emission limit which will provide for attainment of the 
NAAQS when stack height credit is restricted to GEP.
    The term ``excessive concentration'' is defined in the regulations 
to be a 40% increase in concentrations of an air pollutant due to 
downwash which also results in an exceedance of an applicable NAAQS or 
prevention of significant deterioration (PSD) increment. In order to 
demonstrate that stack height in excess of the GEP formulas is needed, 
a source owner must show through the use of fluid modeling that, when 
meeting emission rates equivalent to the new source performance 
standard applicable to the source category, excessive concentrations 
would result from the use of a shorter stack height. However, a source 
may demonstrate that the NSPS emission limit is infeasible, 
establishing an alternative emission limit that represents the most 
stringent degree of emissions control feasible for the particular 
source. In making this demonstration, source owners may generally rely 
on EPA's Guidelines for the Determination of Best Available Retrofit 
Technology for Coal-Fired Power Plants and Other Existing Stationary 
Facilities, EPA 450/3-80-009b, November 1980 (BART Guideline).

C. The 1981 and 1986 SIP Submittals

1. The 1981 SO2 SIP Submittal
    A Utah SO2 SIP revision was submitted with a letter dated 
August 17, 1981, by the Governor of Utah to address the attainment of 
the SO2 NAAQS in Salt Lake County and portions of the 
nonattainment area in Tooele County. Additional information was 
submitted by the State on December 7, 1981 and January 25, 1983. On 
February 7, 1983, the Governor submitted a request to redesignate all 
of Salt Lake County and the nonattainment portion of Tooele County to 
attainment. On March 23, 1984 (49 FR 10926), EPA proposed to delay any 
action on the request to redesignate the area to attainment until final 
resolution of several issues. A detailed discussion of this SIP 
revision is contained in the March 23, 1984 Notice of Proposed 
Rulemaking and should be used as a reference for additional 
information.
    This SIP revision contained several complex national issues, such 
as what constitutes ambient air and whether attainment demonstration is 
sufficient without dispersion modeling or monitoring. Section 50.1 of 
Title 40 Code of Federal Regulations (CFR) defines ``ambient air'' 
simply as ``that portion of the atmosphere, external to buildings, to 
which the general public has access.'' Application of that regulatory 
provision is based on an evaluation of where public lands are involved, 
where private lands are subject to little restriction on access, or 
conversely, where lands adjacent to a source are clearly restricted for 
the public. Kennecott has maintained for some years, that public access 
to the property (and therefore, the atmosphere) in question has been 
and is precluded. The cumulative effect of Kennecott's property 
holding, property exchanges, installation of fences, posts, no-
trespassing signs, and security patrolling, supports the Company's 
claim to control use of the relevant property. There was information on 
termination of limited elk hunting practices in the area. Kennecott's 
man-made barriers, and other security measures, together with the 
inherently rugged nature of the mountainous terrain involved, were 
believed to effectively preclude access.
    The control strategy for the 1981 SIP has several parts: (1) 
Emission limitations on several low-level stacks at the smelter (e.g., 
boilers and heat treaters); (2) reasonably available measures to 
control or eliminate fugitive emissions; and (3) cumulative emission 
limits for the main stack (see additional discussion on these emission 
limits in 2.b. below). The State's strategy was based upon measured 
ambient data in the lower elevation near the smelter. EPA identified 
the major deficiencies of the State analysis: (1) The State made no 
attempt to demonstrate the effects in the upper elevation (above 5600 
feet in the Oquirrh Mountains); and (2) the database at the smelter was 
insufficient to be used reliably with the established emission limits, 
given the assumption in the development of the emission limits 
technique. Modeling analyses performed by the State and EPA to 
demonstrate attainment in the upper elevation were screening analyses 
only. EPA concluded that dispersion modeling in this complex terrain 
was unreliable and that the only method that could be used for this 
determination was monitoring. The 1981 SO2 SIP was conditionally 
approved on the assumption that the emission limits were consistent 
with federal 1985 stack height rules and, therefore, adequate for 
attainment of the SO2 NAAQS. The redesignation of the area to 
attainment was denied. (50 FR 7059, February 20, 1985)
2. The May 2, 1986 GEP SIP Submittal
    The Utah Stack Height SIP was submitted by the Governor with a 
letter dated May 2, 1986. The submittal included regulations to address 
(1) GEP stack height credit and dispersion techniques, (2) a new 
Section 17 of the SIP that listed all existing stacks in Utah greater 
than 65 meters, and (3) a technical support document for Section 17 of 
the SIP. The Kennecott Magna stack analyses were part of this 
submittal. Subsequent submittals to support the Kennecott analyses were 
received in letters dated October 6, 1986, December 3, 1986, November 
13, 1987, and May 17, 1988.
    The Kennecott smelter stack height credit was a significant 
component of the Utah SO2 SIP emission limits conditionally 
approved on February 20, 1985. Briefly, a condition in that approval 
required the State to determine whether the 1215-foot stack would be 
GEP once the revised stack height regulations were promulgated. If not, 
the emission limits would then be revised as necessary.
    a. Applicability of the NSPS Regulation. The federal NSPS 
regulation for primary copper smelters applies to any such facility 
that commences construction or modification after October 16, 1974 (42 
FR 37937, July 25, 1977 and 40 CFR 60.160). Modification generally 
means any physical or operational change which results in an increase 
in the emission rate to the atmosphere. NSPS require, among other 
things, control of the strong gas streams with a double contact acid 
plant (i.e., a stack gas of 650 ppm or less SO2, based on a 6-hour 
average (EPA 450/3-83-018a)).
    The Kennecott Magna smelter expansion/modification began in the 
early 1970s, with a commitment to the 1215-foot stack in 1973 and 
completion of the project in 1977. The modification of the acid plant 
system resulted in an increase from 60% sulfur capture to 86%, 
approximately a 65% reduction of sulfur emissions. Based on this 
information, EPA concluded that the 1970's Kennecott expansion/
modification did not subject the smelter to NSPS requirements.
    b. Analyses on the 1986 Submittal. The Kennecott stack height 
analyses were undertaken to comply with the July 8, 1985 stack height 
regulation, as well as the condition specified in the approval of the 
Utah SO2 SIP. The reader should refer to the February 2, 1985 
final conditional approval (50 FR 7056) and March 23, 1984 proposed 
approval (49 FR 10946) Federal Register actions for additional 
information on the Utah SO2 SIP.
    Kennecott originally had two 400-foot stacks (grandfathered stack 
heights) from which SO2 emissions from the smelter were vented. 
The 1970's modification/expansion included the replacement of the 400-
foot stacks with a single 1215-foot stack. The GEP formula height 
(H+1.5 L), considering the nearby buildings, is 212.5 feet. The federal 
regulation established the policy that sources faced with excessive 
concentrations, due to downwash, should be required to attempt to 
reduce those concentrations by reducing emissions to the degree 
feasible before seeking credit above the GEP formula. The benchmark for 
this requirement is the NSPS or the alternative level of control 
established through the application of BART if the NSPS is found to be 
infeasible. The demonstration that the NSPS is infeasible can be done 
through a fluid modeling analyses.
    The initial Kennecott GEP demonstration was submitted on May 2, 
1986, with subsequent submittals on October 6, 1986, December 3, 1986, 
November 13, 1987, and May 11, 1988. There are two basic parts to the 
Kennecott analyses: the GEP demonstration and BART analysis. The GEP 
demonstration consists of three subparts: the fluid modeling protocol, 
the fluid modeling results, and an evaluation of the fluid modeling 
results with respect to the stack height regulations. The BART analysis 
is performed if the source contends that the NSPS emission limits are 
infeasible. Relevant factors for this analysis include: high cost-
effectiveness ratio, excessive local community impact, excessive plant 
impact, and technological infeasibility.
    Since the Kennecott emissions, as established through Multi-point 
Rollback (MPR), were used in the 1981 SO2 SIP, EPA's primary 
concern, with the use of any emission rate in the demonstration of GEP, 
is ensuring protection of the NAAQS (i.e., to protect health and 
welfare). The basic concept behind GEP is to prevent sources from using 
illegal dispersion techniques to avoid emissions controls.
    Kennecott provided extensive data on its GEP analyses. The reader 
is referred to 53 FR 48942 for information on the GEP demonstration and 
BART analysis. To summarize, the GEP demonstration showed that the 
existing stack height of 1215-foot (370.4m) met the 40% criterion due 
to terrain effects and an exceedance of the NAAQS at MPR emission 
rates. (Discussion of the MPR emission rates for Kennecott can be found 
in 49 FR 10948, March 12, 1983, proposed rulemaking). MPR is a 
technique designed for sources with variable emission rates (e.g., 
smelters). MPR allows for a frequency distribution of emission rates 
which will permit extremely high emissions on rare occasions. The MPR 
methodology is constructed around the recognition that any control 
strategy will have a predictable probability of allowing a violation of 
the NAAQS. The MPR is based upon allowing a 26% probability of 
recording a violation (Additional information on MPR is found in 
Appendix A). The GEP demonstration satisfies the excessive 
concentration criteria in EPA's regulation if MPR reflects the proper 
emission rates. After review, EPA concluded that Kennecott's analyses 
were acceptable, since Kennecott performed a fluid modeling study 
consistent with existing guidance and the study was approved by EPA.
    The purpose of establishing a BART emission rate in the 1985 stack 
height regulations was to prevent source owners from using unreasonably 
high emission rates to justify credit for excessive stack heights. The 
regulation requires that sources faced with excessive concentrations 
due to downwash should be required to attempt to reduce those 
concentrations by reducing those emissions to the degree feasible 
before seeking credit above the GEP formula. The benchmark for this 
requirement is the NSPS, or an alternative level of control established 
through the application of BART if NSPS is found to be infeasible. 
Kennecott provided responses to all the BART factors mentioned above. 
The cost-effectiveness ratio and technical infeasibility issues, 
however, were determined critical to this review because of their 
relationship to the emission limitations used in the GEP analyses.
    Application of the level of control required by NSPS would reduce 
the emissions of SO2 at Kennecott during the stable process phase, 
but would not affect emission rates under startup, shutdown, 
malfunction, and upset conditions. This is because the NSPS emission 
rate is for normal operations and excludes such process conditions. MPR 
includes startup, shutdown, malfunction, and upset conditions. From the 
Kennecott assessment, considering only long-term averages, the cost 
portion is consistent with the tons of SO2 reduction expected from 
similar NSPS applications. In the Kennecott BART analysis, the 
controlling emissions for the determination of GEP appear to be those 
under upset, start-up, shutdown, and malfunction. Therefore, while 
there would be no difference in the emission rates under these 
conditions as a result of meeting NSPS, there would be a substantial 
additional cost to control these emissions.
    In summary, the emissions at the smelter from startups, shutdowns, 
upsets, and malfunctions are included in the MPR emission limits and 
could be considered in the NAAQS attainment and GEP analyses. 
Application of NSPS technology will not affect these emission rates and 
will, therefore, result in no change in demonstrating GEP. It may be 
possible to reduce annual emissions by requiring additional controls on 
the smelter, but such reduction would have no relevance to the limiting 
case for determination of GEP.
    Given the above discussion, EPA proposed to approve (53 FR 48942, 
December 5, 1988) the Kennecott analysis in the Utah GEP SIP submitted 
on May 2, 1986, with subsequent submittals on October 6, 1986, December 
3, 1986, November 13, 1987, and May 17, 1988. However, EPA's review was 
conducted under a specific assumption: that the emission rate(s) in the 
SO2 SIP were sufficient to demonstrate attainment. That assumption 
followed another critical assumption: that Kennecott owned or 
controlled the lands in the upper elevation for which no monitoring 
data exist to demonstrate attainment of the NAAQS.
    Only one comment was received in response to the December 5, 1988 
Federal Register proposed approval of the Kennecott GEP demonstration. 
The comment was from Kennecott in support of this action. However, 
prior to publication of the proposed approval Federal Register, EPA did 
receive a letter from a landowner in the Oquirrh Mountains expressing 
concerns due to the lack of ambient monitoring in the nonattainment 
area. This was EPA's first documented information on public access in 
the nonattainment area other than the Kennecott operation. EPA 
proceeded to continue its evaluation of the State submittal and to 
publish its position on the GEP demonstration based on the State 
submittal, but initiated a reevaluation on land ownership above the 
5600-ft. elevation in the Oquirrh Mountains. Documentation on the claim 
of land ownership, other than that of the Kennecott operations, was 
provided by Howard Haynes, Jr. in March 1989.
3. Utah 1981 SO2 and 1986 GEP SIP Reassessment
    Data from the Salt Lake County and Tooele County Assessor offices 
showed over 80 landowners in this nonattainment area. Kennecott, in its 
land ownership research, verified the list of landowners.
    As stated above, one of the critical assumptions of the conditional 
approval of the 1981 SO2 SIP and the emission rate was Kennecott's 
ownership or control of those lands in the potential nonattainment area 
in the Oquirrh Mountains. The land ownership research revised the EPA's 
earlier assumptions on the adequacy of the 1981 SO2 and the 1986 
GEP Stack SIPs.
    EPA entered into discussions with Kennecott and the State for 
resolution of these issues and attempted to outline the procedures for 
addressing the SO2 and GEP SIPs. Documentation of these meetings 
and discussions is found in EPA letters to the State dated July 12, 
1989, and August 14, 1989. Since monitoring has been stated as the only 
method to conclusively determine the attainment status of lands in the 
Oquirrh Mountain, the State and Kennecott proceeded to develop a 
monitoring program. Maximum ambient concentration location of the 
monitors, access to the monitors, and operational logistics of the 
monitor(s) were key problems identified.
    During these negotiations, the State was developing the PM10 
SIP for Salt Lake County. The Salt Lake County PM10 SIP 
development process identified SO2 as a precursor for PM10. 
(Precursors are secondary particles which are formed in the atmosphere 
from gases which are directly emitted by the source. Sulfates are one 
of the most common secondary particles in a PM10 nonattainment 
area and result from sulfur dioxide emissions.) The Kennecott smelter 
SO2 emissions comprised 56% of the total (primary and 
secondary) PM10 emissions in Salt Lake County.
    The PM10 SIP was adopted by the State in August 1991 and 
submitted to EPA in November 1991. The reader is referred to 57 FR 
60149, December 18, 1992, for information on the PM10 SIP. The 
PM10 SIP required significant emission reduction for the Kennecott 
operations (refinery, concentrator, mine, power plant and smelter). The 
Kennecott smelter emission limits were reduced from 76,000 tpy or 
18,000 lb/hr annual average (as allowed in the 1981 SO2 and 1986 
GEP SIPs) to 18,500 tpy (which includes fugitive emissions, 
and applies to the entire smelter). (The 1981 SO2 and 1986 GEP 
SIPs addressed emissions from smelter processing units and SO2 
collection and removal equipment vented to the smelter tall stack. They 
did not include fugitive emissions. For clarification, the 76,000 tpy 
was reduced to the 14,191 tpy limit on the 1215-foot stack for 
emissions from the smelter processing units and SO2 collection and 
removal equipment).

D. The 1991 GEP and 1992 SO2 SIP Submittals

    Prior to the State's adoption of the PM10 SIP, EPA discussed 
the uncertainties of finalizing the 1986 GEP SIP with the State and 
Kennecott. EPA clarified its position on the need for consistency 
within the Utah SIP with respect to emission limitations at the 
Kennecott smelter. In a letter dated July 18, 1991, EPA outlined the 
SIP Revisions that must occur to address the inconsistencies between 
the 1981 SO2 SIP, the 1986 GEP SIP, and 1991 PM10 SIP. To 
summarize, EPA stated that it could not knowingly and legally proceed 
to approve a regulation and emission limitation that were no longer 
applicable, or a stack height demonstration analysis based on an 
obsolete regulation or emissions limitation.
    In a letter dated December 23, 1991, the Governor of Utah submitted 
a revision to Section 16, Demonstration of GEP Stack Height, of the 
Utah SIP. The 1991 submittal was received on December 30, 1991. On 
February 28, 1992, EPA advised the Governor of Utah that this submittal 
was administratively and technically complete in accordance with the 
Federal SIP completeness criteria.
    The revisions to Section 16 specify the allowable emission limit 
for the 1215-foot main stack at 14,191 tons/year as derived in the 
PM10 SIP. This emission limit is based on double contact acid 
plant technology (which is considered NSPS for the smelter acid plant 
tail gas), significant capture improvement of fugitive emissions, and 
improved operation and maintenance. The 1991 submittal also contained a 
reanalysis of other sources in the State for which stack heights above 
the deminimus level (65m) were previously reported. (These sources' 
stack heights were published in 54 FR 24334, June 7, 1989.)
    EPA found minor changes between the June 7, 1989 Federal Register 
and the 1991 revision to Section 16 for the ``actual'' stack height of 
some sources. EPA is not concerned with these minor changes since they 
could be attributed to errors in rounding and the stack height changes 
are less than one foot. Listed below are the differences between the 
June 7, 1989 Federal Register and the 1991 submittal: 

------------------------------------------------------------------------
                                                June 7, 1989     1991   
                   Source                           FR         revision 
------------------------------------------------------------------------
Desert Units 1 and 2.........................  182.9m         182m      
UP&L Hunter Units 1 and 2....................  183.08m        183m      
UP&L Hunter Unit 3...........................  183.1m         183m\1\   
UP&L Huntington Units 1 and 2................  182.93m        183m      
IPP Units 1 and 2............................  216.46m        216m      
Chevron USA HCC cracker......................  1946\1\        1950\2\   
------------------------------------------------------------------------
\1\The State indicated very insignificant changes to these sources      
  ``calculated'' GEP stack heights; the State has indicated that the    
  ``actual'' height will be the enforceable stack height.               
\2\Correction of grandfathered date.                                    

    The State's revised analyses are presented in the table below. 
Detailed documentation for these analyses and the corresponding EPA 
review is contained in the EPA technical support document and air 
compliance files, and the State files. 

------------------------------------------------------------------------
                                                              Allowable 
                                                    Stack        SO2    
                  Source name                      height     emissions 
                                                    (M)      (ton/year) 
------------------------------------------------------------------------
Deseret Units 1&2...............................    182          1,512  
U.P.&L. Hunter Units 1&2........................    183          4,347  
U.P.&L. Hunter Unit 3...........................    183          1,283  
U.P.&L. Huntington Units 1&2....................    183          9,448  
I.P.P. Units 1&2................................    216         17,870  
U.P.&L. Gadsby Units 1,2&3......................     76.2          +67.7
Geneva Steel blast furnaces 1&2.................     79.2         +*12.5
Geneva Steel Coke blast furnace.................     68.6   ............
Geneva Steel Coke Combustion 1-4................     76.2         +102.8
Kennecott Utah Copper Smelter Main Stack........    370       +*14,191  
Chevron USA HCC Cracker Cat. Dis................     88.4          +66.7
Chevron Research Air Heater.....................     69.8            0  
Chevron Research Retort.........................     69.8           +0  
Amax melt reactor...............................     76.22           0  
Amax electrolytics..............................     76.22           0  
Amax emergency off gas..........................     76.22           0  
Amax spray dryers 1-3...........................     76.22          83  
Phillips thermal cat. cracking..................     80.8           +3.5
White River Shale Lift Pipes....................     76.2   ............
White River Elutriators.........................     76.2   ............
White River Hydrogen Plant......................     76.2   ............
White River Power Plants........................     76.2   ............
White River Ball Heaters........................     76.2       *1,180.8
Tosco Preheat Stacks............................     95              -  
Tosco Warm Ball Elutriators.....................     95              -  
Tosco Process Shale Wetters.....................     95         *1,166.6 
------------------------------------------------------------------------
+SO2 emissions derived from the PM10 SIP adopted August 14, 1991.       
*The total SO2 emissions are given for these sources.                   

    On May 15, 1992, the Governor of Utah submitted a revision to 
Section 9, Part B, Sulfur Dioxide, Utah SIP. The revision was to 
address the 1990 CAA requirement that a SIP revision be submitted by 
May 15, 1992, for any area that did not have a fully approved SIP (the 
1981 SO2 SIP was only conditionally approved). The significant 
change in this SIP revision from that of the 1981 submittal is as 
follows:
    a. The MPR emission limitations and assumptions are removed and 
replaced with the emission limitation which can be achieved using the 
NSPS technology, double contact acid plant, or the equivalent of NSPS. 
(NSPS is the presumptive norm for RACT for this facility.) The SO2 
SIP now references the same emission limitations as those stated in 
PM10 SIP.
    b. The SO2 NAAQS are the 0.14ppm, 24-hour primary standard, 
and the 0.5ppm, 3-hour secondary standard. The 24-hour impact analysis 
was a rollback analysis which compared the smelter emissions in 1991 
(PM10 SIP emission limitation) with 1979 emissions. The State had 
monitoring data showing attainment at Lake Point (an area originally 
defined as ambient air and owned by the Bureau of Land Management, but 
now owned by Kennecott) where exceedances were recorded. The Lake Point 
site could be considered representative of the closest point in the 
elevated terrain that would be impacted by the tall stack emissions. 
Demonstrating attainment at Lake Point would technically support the 
attainment elsewhere in the elevated terrain that is considered ambient 
air. The area considered ambient air in the elevated terrain is a 
significant distance downwind from Lake Point.
    c. The PM10 SIP addressed, to some degree, the 3-hour impact. 
The PM10 SIP emission limitation was based on a 24-hour SO2 
limit; this emission limitation would be achieved through a given lb/hr 
calculated on a 6-hour average. The 24-hour limit was considered 
``controlling'' for PM10 and SO2 (i.e., the 24-hour 
limitation was believed to be the level of control necessary for 
PM10 attainment, as well as for the SO2 attainment 
demonstration). The SO2 SIP established a 3-hour limitation and 
verified that such limitation would protect the 3-hour NAAQS.
    d. Section 4.2 of the Utah Air Conservation Regulations was revised 
to include a 24-hour averaging period for the sulfur content of coal, 
fuel oil, and fuel mixtures, and to specify the ASTM methods to be used 
to demonstrate compliance with the limitation and reporting 
requirement. (The previous rule specified a limit for the sulfur 
content of fuels, but did not specify an averaging time or specific 
ASTM methods.) Section 4.6 was also revised to include a 3-hour 
averaging time for Sulfur Burning Production Sulfuric Acid Plants.
    e. Specific regulations which provided for special consideration 
(including malfunction provisions) on the smelter fluctuating operation 
are removed. Malfunction provisions for the Kennecott smelter operation 
are now the same as for any stationary source in Utah. This issue was 
addressed during the PM10 SIP development and is being approved 
under the PM10 SIP federal approval process. These regulation 
impacts were clarified in this SIP revision.

II. This Action

    The December 23, 1991 Section 16, Stack Height revision and the May 
15, l992 Section 9, Part B, SO2 revision are consistent with other 
provisions in the State-wide SIP. EPA is proposing to approve these 
revisions because they are consistent with EPA guidance for GEP stack 
height demonstration and the attainment demonstration for the SO2 
NAAQS.
    These revisions resolve EPA's concerns regarding ambient air, 
attainment demonstration in the elevated terrain, and the 
enforceability issues related to the smelter operations. The previous 
emission limitations have been the subject of litigation filed by the 
Environmental Defense Fund. The legal actions have been stayed pending 
EPA final action on the past SIP revisions. The 1991 and 1992 revisions 
are believed to have settled the litigants' concerns about applying 
reasonable control technology and demonstrating attainment per the 
traditionally accepted federal requirements (i.e., application of RACT 
(double contact acid plant or the equivalent), monitoring 
demonstration, etc).

Request for Public Comment

    The EPA is requesting comments on all aspects of today's proposal. 
As indicated at the outset of this document, EPA will consider any 
comments received by May 18, 1994.
    Nothing in this action should be construed as permitting or 
allowing or establishing a precedent for any future request for 
revision to any State Implementation Plan. Each request for revision to 
any State Implementation Plan shall be considered separately in light 
of specific technical, economic, and environmental factors and in 
relation to relevant statutory and regulatory requirements.

Regulatory Flexibility

    Under the Regulatory Flexibility Act, 5 U.S.C. 600 et seq., EPA 
must prepare a regulatory flexibility analysis assessing the impact of 
any proposed or final rule on small entities. 5 U.S.C. 603 and 604. 
Alternatively, EPA may certify that the rule will not have a 
significant impact on a substantial number of small entities. Small 
entities include small businesses, small not-for-profit enterprises, 
and government entities with jurisdiction over population of less than 
50,000.
    SIP approvals under section 110 and subchapter I, part D of the CAA 
do not create any new requirements, but simply approve requirements 
that the State is already imposing. Therefore, because the federal SIP-
approval does not impose any new requirements, I certify that it does 
not have a significant impact on any small entities affected. Moreover, 
due to the nature of the federal-state relationship under the CAA, 
preparation of a regulatory flexibility analysis would constitute 
federal inquiry into the economic reasonableness of state action. The 
CAA forbids EPA to base its actions concerning SIPs on such grounds. 
Union Electric Co. v. U.S. E.P.A. 427 U.S. 246, 256-66 (S.Ct. 1976); 42 
U.S.C. 7410(a)(2).

Executive Order 12866

    The Office of Management and Budget has exempted this rule from the 
requirement of section 6 of Executive Order 12866.
    This action has been classified as a Table 2 action by the Regional 
Administrator under the procedures published in the Federal Register on 
January 19, 1989 (54 FR 2214-2225), as revised by an October 4, 1993, 
memorandum from Michael H. Shapiro, Acting Assistant Administrator for 
Air and Radiation. A future document will inform the general public of 
these tables. On January 6, 1989, the Office of Management and Budget 
(OMB) waived Table 2 and Table 3 SIP revisions (54 FR 222) from the 
requirements of section 3 of Executive Order 12291 for 2 years. The EPA 
has submitted a request for a permanent waiver for Table 2 and Table 3 
SIP revisions. The OMB has agreed to continue the waiver until such 
time as it rules on EPA's request. This request continues in effect 
under Executive Order 12866 which superseded Executive Order 12291 on 
September 30, 1993.

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Reporting and 
recordkeeping requirements, and Sulfur dioxide.

    Authority: 42 U.S.C. 7401-7671q.

    Dated: March 31, 1994.
Jack W. McGraw,
Acting Regional Administrator.
[FR Doc. 94-9292 Filed 4-15-94; 8:45 am]
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