[Federal Register Volume 61, Number 185 (Monday, September 23, 1996)]
[Rules and Regulations]
[Pages 49685-49688]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-24047]



[[Page 49685]]

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


ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 52

[TX-58-1-7256a; FRL-5557-8]


State of Texas; Approval of State Implementation Plan (SIP) 
Addressing the Sulfur Dioxide Emission Limit; Site-Specific Revision to 
the SIP for the Aluminum Company of America (ALCOA) Facility in 
Rockdale, TX

AGENCY: Environmental Protection Agency (EPA).

ACTION: Direct final rule.

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

SUMMARY: This document announces the EPA's decision to approve a 
September 20, 1995, request from the State of Texas for a site-specific 
revision to the Texas sulfur dioxide (SO2) SIP. The revision 
amends the SO2 emission limitations applicable to the ALCOA 
facility in Milam County, Texas. In this action, the EPA is approving 
Texas' SIP revision allowing an increase in lignite fuel emissions of 
SO2 from 3.0 pounds per million British thermal units (lb/MMBtu) 
to 4.0 lb/MMBtu. The SIP revision also includes new requirements for 
limits on the sulfur content of the petroleum coke used at the ALCOA 
facility and an increased stack height to ``Good Engineering 
Practices'' (GEP) as defined in 40 CFR 51.100 (ii). Texas has modeled 
these changes demonstrating that with the revisions the National 
Ambient Air Quality Standards (NAAQS) for SO2 will remain 
protected.

DATES: This action is effective on November 22, 1996, unless adverse 
comments are received by October 23, 1996. If the effective date is 
delayed, timely notice will be published in the Federal Register.

ADDRESSES: Comments should be mailed to Thomas H. Diggs, Chief, Air 
Planning Section (6PD-L), Environmental Protection Agency Region 6, 
1445 Ross Avenue, Dallas, Texas 75202-2733. Copies of the State's 
petition and other information relevant to this action are available 
for inspection during normal hours at the following locations:

Environmental Protection Agency, Region 6, Air Planning Section (6PD-
L), 1445 Ross Avenue, Suite 1200, Dallas, TX 75202-2733.
Air and Radiation Docket and Information Center, Environmental 
Protection Agency, 401 M. Street, S.W., Washington, DC 20460.
Texas Natural Resource Conservation Commission, Office of Air Quality, 
12124 Park 35 Circle, P.O. Box 13087, Austin, TX 78711-3087.

    Anyone wishing to review this petition at the EPA office is asked 
to contact the person below to schedule an appointment 24 hours in 
advance.

FOR FURTHER INFORMATION CONTACT: Ms. Petra Sanchez, Air Planning 
Section (6PD-L), Environmental Protection Agency, Region 6, 1445 Ross 
Avenue, Dallas, Texas 75202-2733, telephone (214) 665-6686.

SUPPLEMENTARY INFORMATION:

I. Background

    On May 31, 1972 the EPA approved the original Texas SIP submission 
allowing for 3.0 lbs/MMBtu SO2 emissions from solid fossil fuel-
fired steam generators at the ALCOA plant. In 1979, ALCOA petitioned 
the Texas Air Control Board (TACB), now the Texas Natural Resource 
Conservation Commission (TNRCC), to allow relaxed SO2 emission 
limitations for its power plant units.
    The 1979 relaxation increased the allowable SO2 limit to 5.0 
lb/MMBtu, and was published in the Texas Register on July 6, 1979. 
After a public hearing conducted by the TACB on November 13, 1979, 
ALCOA modified its original petition and agreed to gradually lower the 
SO2 emission limit from 5.0 lb/MMBtu SO2 to 4.5 lb/MMBtu in 
1981, and eventually to 4.0 lb/MMBtu after January 1, 1982. The TACB 
adopted this phased-in schedule on December 14, 1979, thus, lowering 
the requirement to 4.0 lb/MMBtu, as it remains today in the Texas 
regulations (see TAC Sec. 112.8). However, the increase in allowable 
SO2 limits was not officially revised and submitted to the EPA for 
approval as a SIP revision. Also in 1979, a new 545 MW power plant 
(Sandow Four) was built, doubling the fuel capacity from 2.1 million to 
5.6 million tons of lignite per year. Sandow Four is owned by TU 
Electric Company and is under a contractual agreement with ALCOA to 
supply most of its power to ALCOA's operations. Therefore, Sandow Four 
Unit is not part of this SIP action but must meet more stringent 
emissions limitations. Sandow Four has a Prevention of Significant 
Deterioration (PSD) permit and is under New Source Performance 
Standards (NSPS) as well thus, BACT (Best Available Control Technology) 
applies. Under NSPS, Sandow Four is subject to a limitation of 1.2 lb/
MMBtu SO2 emissions in accordance with 40 CFR 60, Subpart D.

SIP Violation

    On May 5, 1981, the EPA issued a Notice of Violation to ALCOA for 
exceeding the 3.0 lb/MMBtu SO2 limit in the approved 1972 SIP. 
Without an approved SIP revision, ALCOA should have complied with the 
3.0 lb/MMBtu limit under federal law rather than the higher state 
limit. The SIP revision provided by Texas includes information on the 
ALCOA facilities (i.e., Sandow One, Two, and Three) to ensure that a 
sulfur limit relaxation for those units will result in acceptable 
levels of SO2 concentrations and to ensure continued attainment of 
the SO2 National Ambient Air Quality Standards. To support the 
proposal, ALCOA submitted technical feasibility studies and economic 
evaluations, supported by ambient monitoring data and dispersion 
modeling. Compliance with the NAAQS and Prevention of Significant 
Deterioration (PSD) increments for SO2 emission levels were 
supported through modeling procedures. The final submittal from the 
State contained limits on the use of sulfur-bearing fuels for the three 
units to prevent potential violations of the SO2 NAAQS. A public 
hearing announcement was published on May 11, 1995, and a hearing was 
held on June 14, 1995, in Rockdale, Texas. No adverse comments were 
received. Comments were generally supportive of the action. The EPA 
found the SIP revision to be administratively complete in a letter 
dated November 28, 1995. For further details on the SIP submittal, 
please reference the Technical Support Document on file.

Good Engineering Practice and Stack Height Increase at Sandow Three

    In June of 1995, ALCOA completed construction of a new stack for 
Sandow Three to increase the height of the emission point from 81 to 
161 meters. The increase in height helped avoid the down-washing effect 
caused by the presence of large nearby structures. However, another 
effect of increasing stack height is to disperse emissions over a 
larger area, resulting in lower ambient concentrations without a true 
emissions reduction in grams per second. To limit over-crediting, the 
EPA federal regulations which define ``Good Engineering Practices'' 
(GEP) for the stack height, were evaluated to ensure that emissions do 
not result in excessive concentrations due to atmospheric downwash, or 
wakes created by terrain or structures in the vicinity of a source. 
Requirements, promulgated under 40 CFR Part 51, regulate stack height 
``credits'' instead of actual stack height.
    A GEP stack is defined under 40 CFR 51.100 (ii) by a formula that 
relates stack height to the dimensions of nearby structures, thus 
restricting stack increases to the modeling height necessary to avoid 
over-crediting by dilution. It also specifies certain site-specific 
demonstrations that are required to justify increases of an

[[Page 49686]]

existing stack to GEP formula height. The EPA interpretation of this 
rule (stated in a July 29, 1992 memo from the EPA's Office of Air 
Quality Planning and Standards to the EPA Directors) waives the 
requirement for a site-specific demonstration if a new structure has 
been built since the construction of the original stack. Thus, the 
siting of a new nearby structure removes a presumption that the 
original stack height is the GEP height, since the new structure may 
create downwash effects that were not anticipated in the original stack 
design. In ALCOA's case, the stack for Sandow Three was built in the 
early 1950's and Sandow Four was built in the late 1970's on adjacent 
property. The presence of the Sandow Four structure created new 
downwash effects. Therefore, the stack height increase is allowed by 
the EPA's stack height regulations, as long as it is within the 
allowable height as defined by 40 CFR 51.100(ii).

Dispersion Modeling Analysis

    Dispersion modeling was used to demonstrate that ambient SO2 
concentrations are predicted to be below the NAAQS and allowable 
Prevention of Significant Deterioration (PSD) increments. Dispersion 
modeling integrates historical meteorological data and continuous 
industrial emissions to predict whether the population outside of a 
facility's property could be exposed to SO2 levels above 
applicable health-based standards.
    Alcoa hired Earth Tech/Sigma Research to conduct the modeling 
analyses to demonstrate that the ALCOA aluminum reduction facility and 
power plant was in compliance with the NAAQS. The PSD increments 
modeling was also performed to determine whether an incremental 
increase in SO2 emissions from three to four pounds per MMBtu heat 
input at Units one, two, and three of the Sandow Power Plant would 
cause any violations.
    The Industrial Source Complex--Short Term (ISCST2) model was used 
to model the Sandow power plant point sources along with 132 non-ALCOA 
background sources. The Buoyant Line and Point (BLP) Source model was 
used to model all of the line and scrubber stacks for the aluminum 
reduction facilities. The meteorological data used in the analyses were 
obtained from the Austin surface station and the Stephenville upper air 
station. The modeling was conducted in accordance to EPA's Guideline on 
Air Quality Models and were generally consistent with the EPA's 
regulatory recommendations.

NAAQS Modeling Analysis

    The NAAQS analyses was performed in three phases. Results of the 
ISCST2 model and BLP dispersion modeling runs were summed up to provide 
ambient concentrations on an hourly basis for each receptor. Ambient 
concentrations were then compared with the primary and secondary NAAQS. 
The NAAQS limits are:

                         National SO2 Standards                         
------------------------------------------------------------------------
                                                              Micrograms
                                                               per cubic
                            NAAQS                             meter  (ug/
                                                                  m3)   
------------------------------------------------------------------------
Primary annual SO2..........................................         80 
Primary 24-hour.............................................        365 
Secondary 3-hour............................................      1,300 
------------------------------------------------------------------------

    To demonstrate compliance with the SO2 NAAQS, four 
alternatives were used (based on smelter production levels and sulfur 
content in the anodes). As discussed in the Technical Support Document, 
the modeling runs predicted no violations of the applicable NAAQS.
    The predicted concentrations for the annual average and the 
highest-second-high (H2H) concentrations for three-hour and 24-hour 
concentrations were below the SO2 NAAQS for all years evaluated. 
The maximum annual concentrations for seven and eight lines scenarios 
are 76.83 ug/m3 and 76.90 ug/m3, respectively. Both occur at 
684900 easting and 3389100 northing, approximately six kilometers north 
of the center of the ALCOA Rockdale facility. Meanwhile, the maximum 
H2H 24-hour concentration which occurs with the 2.6 percent sulfur 
content eight-line scenario is 355.29 ug/m3 at 683783 easting and 
3381889 northing. The maximum H2H three-hour concentration which occurs 
with the 3.0 percent sulfur content seven-line operating scenario is 
1025.59 ug/m3 at 682500 easting and 3382000 northing.

PSD Modeling Analysis

    In addition to the NAAQS evaluations, the EPA requires an analysis 
to ensure that incremental increases of SO2 due to a SIP 
relaxation will not cause a violation of the PSD increments. Milam 
County is classified as a Class II area for the purpose of establishing 
its allowable PSD increments.
    There are no Class III areas in Texas. Numerical increments for 
SO2 are defined below as the maximum increase above baseline, 
ambient concentrations.

                Class II PSD Increment Standards for SO2                
------------------------------------------------------------------------
                         PSD increment                            ug/m3 
------------------------------------------------------------------------
Annual SO2 average............................................        20
24-hour SO2 average...........................................        91
3-hour SO2 average............................................       512
------------------------------------------------------------------------

    The PSD modeling analysis was also performed in three phases. For 
the PSD analysis, the main ALCOA increment-consuming sources are Sandow 
One, Two, and Three. These sources were modeled with ISCST2 using a 1.0 
lb/MMBtu emission rate increase, representing the proposed increase in 
allowable SO2 emission from 3.0 to 4.0 lb/MMBtu. Sandow Four was 
also included in the modeling because it too consumes PSD increment. 
The modeling predicted some exceedances of allowable PSD increments in 
an area about thirty kilometers to the southwest of the ALCOA facility. 
The predicted exceedances however, occurred inside the private property 
owned by the Acme Brick Company.

Closure of FM 1786 and Construction of Alternate Route

    The TNRCC modeling staff predicted excesses of the NAAQS on a 
public roadway, Farm-to-Market Road 1786 (FM 1786), which was 
originally built as an entrance into the plant. ALCOA confirmed these 
possible impacts in their preliminary modeling efforts. After the 
public hearing, ALCOA and Milam County agreed to provide an alternate 
route as part of the county road system, resolving potential citizen 
complaints. ALCOA eventually acquired a 2.4-mile section of FM 1786 and 
privatized the road to limit its public access. On November 23, 1994, 
the Governor of Texas signed the deed transferring this section of 
roadway to ALCOA. With the closure of the former FM 1786, which is the 
entrance to the Rockdale Operations Facility, measures to restrict 
public access are to be taken. A gate has been installed and security 
guards patrol for unauthorized entry.

Monitoring

    ALCOA is currently operating a monitoring network with two monitors 
collecting data on SO2 concentrations, fluoride, wind speed, and 
wind direction. The Agreed Order requires ALCOA to continue providing 
ambient SO2 and meteorological monitors installed and operated at 
the TNRCC approved sites in accordance with the Quality Assurance 
Project Plan (QAPP) to ensure that the NAAQS are protected. The QAPP 
was submitted to the TNRCC for approval and was approved on June

[[Page 49687]]

13, 1995. The TNRCC assumes all responsibility for ensuring quality 
data collection, analysis, calibration, and reporting requirements from 
ALCOA will protect the NAAQS. Monitoring reports submitted to the TNRCC 
currently show no exceedances of the NAAQS.

Enforceability

    In order to protect the annual NAAQS, an annual limit of 3.1 
million MW-hours of power generation from Sandow One, Two and Three is 
imposed on the facility. This limit was used to calculate the annual 
average for all four operating scenarios modeled. The Agreed Order 
adopted by TNRCC and ALCOA ensure the annual limits will be enforced 
and become federally enforceable through this SIP action. Within sixty 
days after adoption of the Agreed Order by the TNRCC, ALCOA began a 
fuel sampling program to determine continuous compliance with the 
emissions limit of 4.0 lbs SO2/MMBtu.
    ALCOA is required to ensure that the total percentage of sulfur 
contained in the new petroleum coke used in the anodes in the operating 
potlines and portions of potlines do not exceed the following amount 
when averaged over a thirty-day period and considering the number of 
potlines in operation during that period:

------------------------------------------------------------------------
                                                             Percent SO2
                                                              allowed in
                Number of operating potlines                     new    
                                                              petroleum 
                                                                 coke   
------------------------------------------------------------------------
8..........................................................          2.6
7 or fewer.................................................          3.0
------------------------------------------------------------------------

    When additional potlines or portions of potlines are started up or 
shut down, the maximum allowable percentage of sulfur in the new 
petroleum coke shall conform with the applicable sulfur limits stated 
above. If ALCOA operates a portion of a potline between the number of 
potlines specified above, the maximum allowable percentage of sulfur in 
the new petroleum coke shall be determined by proportional 
interpolations between the pair of limits specified above. ALCOA will 
notify the TNRCC Regional Office ten (10) days prior to the start up or 
shut down of any potline(s) or portions of potlines except that in the 
case of an emergency shutdown, notice shall be given as soon as 
reasonably possible.
    ALCOA is prohibited from using any new petroleum coke without test 
reports or on-site testing demonstrating compliance. ALCOA is also 
required to ensure that the sulfur content of the returned anode butts 
is no greater than the sulfur content of the new petroleum coke used in 
the manufacture of those returned anode butts. ALCOA will demonstrate 
compliance with the total sulfur content limits specified in the Agreed 
Order by limiting the percent sulfur in new petroleum coke to the 
petroleum coke supplier and will require its supplier to sample, 
analyze, and demonstrate that the total sulfur content complies with 
ALCOA's percent sulfur specification before shipment of any single lot 
of new petroleum coke is made. Test reports from suppliers may be used 
to document the sulfur content of new petroleum coke, or on-site 
testing of each incoming new petroleum coke shipment in accordance with 
ASTM Methods D346-90 or ASTM D4239-85. ALCOA will maintain records 
documenting compliance with the requirements of the Agreed Order. 
Records will include computations which show the amounts and total 
percent sulfur content of new petroleum coke and the sulfur content of 
the returned anode butts used in production of anodes. The sulfur 
content of the returned anode butts may be based on records of the new 
petroleum coke that went into them and ALCOA records showing the 
statistically established relationship between that sulfur content and 
the sulfur content of returned anode butts.

Recordkeeping and Reporting Requirements

    ALCOA will maintain a record of the gross power generated for each 
calendar month, and of the gross power generated for the previous 
twelve month period. Records will be made available upon request to the 
TNRCC, the EPA or any local air pollution control agency having 
jurisdiction. Periodic compliance demonstrations will be conducted at 
least quarterly beginning with the calendar quarter ending December 31, 
1995 using methods prescribed for the initial demonstration in the 
Agreed Order. Results will be reported to the TNRCC and the EPA Region 
VI no later than thirty days after the completion of testing.
    The provisions for the Milam County Agreed Order are adopted 
through this SIP action. The Order includes SO2 maximum allowable 
emissions limits, recordkeeping, reporting and compliance monitoring 
requirements and other required stipulations briefly described in this 
notice. For further details on compliance monitoring and record keeping 
requirements please reference the Agreed Order and the Technical 
Support Document.

Final Rulemaking Action

    In today's action, the EPA is approving the ALCOA SIP revision 
which includes among other things, TNRCC Agreed Order No. 95-0583-SIP. 
Texas's revised Milam County SO2 Order creates an enforceable 
restriction on the operations of a primary aluminum smelting plant and 
three units of a lignite-fueled power plant at the ALCOA facility. This 
action is also approving revisions to 31 TAC Chapter 112, section 
112.8, ``Allowable Emissions From Solid Fossil Fuel-Fired Steam 
Generators,'' Subsections 112.8(a) and 112.8(b). Adequate modeling 
demonstrating that the NAAQS for SO2 and SO2 PSD increment 
will be protected in Milam County, Texas was also provided.
    This action is being published without a prior proposal because the 
EPA views this as a noncontroversial revision and anticipates no 
adverse comments to the proposal. However, the EPA is publishing a 
separate document in this Federal Register publication, which 
constitutes a ``proposed approval'' of the requested SIP revision and 
clarifies that the rulemaking will not be deemed final if timely 
adverse or critical comments are filed. The ``direct final'' approval 
shall be effective on November 22, 1996, unless the EPA receives 
adverse or critical comments by October 23, 1996.
    If the EPA receives comments adverse to or critical of the approval 
discussed above, the EPA will withdraw this approval before its 
effective date by publishing a subsequent Federal Register document 
which withdraws this final action. All public comments received will 
then be addressed in a subsequent rulemaking document. Please be aware 
that the EPA will institute a second comment period on this action only 
if warranted by significant revisions to the rulemaking based on 
comments received in response to this action. Any parties interested in 
commenting on this action should do so at this time. If no such 
comments are received, the EPA hereby advises the public that this 
action will be effective on November 22, 1996.
    Nothing in this action should be construed as permitting, allowing 
or establishing a precedent for any future request for revision to any 
SIP. The EPA shall consider each request for revision to the SIP in 
light of specific technical, economic, and environmental factors and in 
relation to relevant statutory and regulatory requirements.
    This action has been classified as a Table 3 action for signature 
by the Regional Administrator under the

[[Page 49688]]

procedures published in the Federal Register on January 19, 1989 (54 FR 
2214-2225), as revised by a July 10, 1995, memorandum from Mary D. 
Nichols, Assistant Administrator for Air and Radiation. The Office of 
Management and Budget (OMB) has exempted this regulatory action from 
Executive Order 12866 review. Section 202 of the Unfunded Mandates 
Reform Act of 1995, signed into law on March 22, 1995, requires that 
the EPA 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 aggregate, or by the private 
sector, of $100 million or more in any one year. Section 203 requires 
the EPA to establish a plan for obtaining input from and informing, 
educating, and advising any small governments that may be significantly 
or uniquely affected by the rule.
    Under section 205 of the Unfunded Mandates Reform Act, the EPA must 
identify and consider a reasonable number of regulatory alternatives 
before promulgating a rule for which a budgetary impact statement must 
be prepared. The EPA must select from those alternatives the least 
costly, most cost-effective, or least burdensome alternative that 
achieves the objectives of the rule, unless the EPA explains why this 
alternative is not selected or the selection of this alternative is 
inconsistent with law.
    This final rule is estimated to result in the expenditure by State, 
local, and tribal governments or the private sector of less then $100 
million in any one year. Therefore the EPA has not prepared a budgetary 
impact statement or specifically addressed the selection of the least 
costly, most cost-effective, or least burdensome alternative. Small 
governments will not be significantly or uniquely affected by this 
rule. Hence, the EPA is not required to develop a plan with regard to 
small governments. This rule only approves the incorporation of 
existing State rules into the SIP. It imposes no additional 
requirements.
    Under 5 U.S.C. 801 (a)(1)(A) as added by the Small Business 
Regulatory Enforcement Fairness Act of 1996, EPA submitted a report 
containing this rule and other required information to the U.S. Senate, 
the U.S. House of Representatives and the Comptroller General of the 
General Accounting Office prior to publication of the rule in today's 
Federal Register. This rule is not a ``major rule'' as defined by 5 
U.S.C. 804(2).
    Under the Regulatory Flexibility Act, 5 U.S.C. 600 et seq., the 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, the 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 populations of less than 
50,000.
    SIP approvals under section 110 and subchapter I, part D of the Act 
do not create any new requirements but simply approve requirements that 
the State is already imposing. The Federal SIP approval does not impose 
any additional requirements. Therefore, I certify that the SIP does not 
have a significant impact on any small entities affected. Moreover, due 
to the nature of the Federal-State relationship under the Act, 
preparation of a regulatory flexibility analysis would constitute 
Federal inquiry into the economic reasonableness of the State action. 
The Act forbids the EPA to base its actions concerning SIPs on such 
grounds. See Union Electric Co. v. EPA, 427 U.S. 246, 256-66 (S.Ct. 
1976); 42 U.S.C. 7410(a)(2).
    Under section 307(b)(1) of the Act, petitions for judicial review 
of this action must be filed in the United States Court of Appeals for 
the appropriate circuit by November 22, 1996. Filing a petition for 
reconsideration by the Regional Administrator of this final rule does 
not affect the finality of this rule for the purposes of judicial 
review nor does it extend the time within which a petition for judicial 
review may be filed, and shall not postpone the effectiveness of such 
rule or action. This action may not be challenged later in proceedings 
to enforce its requirements. See section 307(b)(2).

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Incorporation by 
reference, Sulfur oxides.

    Dated: August 9, 1996.
Allyn M. Davis,
Acting Regional Administrator.

    Title 40, part 52, of the Code of the Federal Regulations is 
amended as follows:

PART 52--[AMENDED]

    1. The authority citation for part 52 continues to read as follows:

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

Subpart SS--Texas

    2. Section 52.2270 is amended by adding paragraph (c) (101) to read 
as follows:


Sec. 52.2270   Identification of Plan.

* * * * *
    (c) * * *
    (101) Revisions to Texas Natural Resource Conservation Commission 
Regulation II and the Texas State Implementation Plan concerning the 
Control of Air Pollution from Sulfur Compounds, submitted by the 
Governor by cover letters dated October 15, 1992 and September 20, 
1995. These revisions relax the SO2 limit from 3.0 lb/MMBtu to 4.0 
lb/MMBtu, and include Agreed Order No. 95-0583-SIP, which stipulates 
specific SO2 emission limit compliance methodologies for the 
Aluminum Company of America, located in Rockdale, Texas.
    (i) Incorporation by reference.
    (A) Texas Natural Resource Conservation Commission Agreed Order No. 
95-0583-SIP, approved and effective on August 23, 1995.
    (B) Revisions to 31 TAC Chapter 112, Section 112.8, ``Allowable 
Emissions From Solid Fossil Fuel-Fired Steam Generators,'' Subsections 
112.8(a) and 112.8(b) as adopted by the TNRCC on August 23, 1995.
    (ii) Additional material.
    (A) The State submittal entitled Revisions to the State 
Implementation Plan Concerning Sulfur Dioxide in Milam County, dated 
June 14, 1995.
    (B) The document entitled Dispersion Modeling Analysis of ALCOA 
Rockdale Operations, Rockdale, Texas, dated April 28, 1995 (document 
No. 1345-05).

[FR Doc. 96-24047 Filed 9-20-96; 8:45 am]
BILLING CODE 6560-50-P