(a) Purpose and scope. This section sets forth the applicable State Implementation Plan (SIP) for Arkansas under section 110 of the Clean Air Act, 42 U.S.C. 7410, and 40 CFR part 51 to meet national ambient air quality standards.

(b) Incorporation by reference. (1) Material listed in paragraphs (c) and (d) of this section with an EPA approval date prior to December 1, 2005, was approved for incorporation by reference by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Material is incorporated as it exists on the date of the approval, and notice of any change in the material will be published in the Federal Register. Entries in paragraphs (c) and (d) of this section with EPA approval dates after December 1, 2005, will be incorporated by reference in the next update to the SIP compilation.

(2) EPA Region 6 certifies that the rules/regulations provided by EPA in the SIP compilation at the addresses in paragraph (b)(3) of this section are an exact duplicate of the officially promulgated State rules/regulations that have been approved as part of the State implementation plan as of December 1, 2005.

(3) Copies of the materials incorporated by reference may be inspected at the Region 6 EPA Office at 1445 Ross Avenue, Suite 700, Dallas, Texas, 75202-2733; the EPA, Air and Radiation Docket and Information Center, Air Docket (6102), 401 M St., SW., Washington, DC 20460; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal__register/code__of__federal__regulations/ibr__locations.html.

(c) EPA approved regulations.

(d) EPA-approved State source-specific requirements.

(e) EPA-approved nonregulatory provisions and quasi-regulatory measures.

[63 FR 56927, Oct. 23, 1998, as amended at 65 FR 61107, Oct. 16, 2000; 66 FR 51316, Oct. 9, 2001; 71 FR 13545, Mar. 16, 2006; 72 FR 18396, Apr. 12, 2007; 72 FR 54561, Sept. 26, 2007; 74 FR 2386, Jan. 15, 2009; 75 FR 14080, Mar. 24, 2010; 77 FR 14675, 14676, Mar. 12, 2012; 77 FR 50037, Aug. 20, 2012; 78 FR 19598, Apr. 2, 2013; 78 FR 53270, Aug. 29, 2013; 80 FR 11574, Mar. 4, 2015; 80 FR 24218, Apr. 30, 2015; 80 FR 38627, July 7, 2015; 81 FR 1887, Jan. 14, 2016; 81 FR 24032, Apr. 25, 2016; 82 FR 60520, Dec. 21, 2017; 83 FR 5939, Feb. 12, 2018; 83 FR 6472, Feb. 14, 2018; 83 FR 30570, June 29, 2018; 83 FR 38966, Aug. 8, 2018; 83 FR 47571, Sept. 20, 2018]

The Arkansas plan was evaluated on the basis of the following classifications:

[37 FR 10850, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 6571, Jan. 29, 1980]

With the exceptions set forth in this subpart, the Administrator approves Arkansas's state implementation plan under section 110 of the Clean Air Act. Furthermore, the Administrator finds that the plan satisfies all applicable requirements of Parts C and D, Title I, of the Clean Air Act as amended in 1990, except as noted below.

[81 FR 32241, May 23, 2016, as amended at 83 FR 38968, Aug. 8, 2018]

(a) Regional haze. The regional haze State Implementation Plan (SIP) revisions submitted on September 23, 2008 and August 3, 2010, and supplemented on September 27, 2011 are partially approved and partially disapproved.

(1) The identification of sources that are eligible for Best Available Retrofit Technology (BART) is approved, with the exception of the 6A Boiler at the Georgia-Pacific Crossett Mill, which is BART eligible.

(2) The identification of sources subject to BART is approved, with the exception of the 6A and 9A Boilers at the Georgia-Pacific Crossett Mill, which are both subject to BART.

(3) The following BART determinations are disapproved:

(i) The sulfur dioxide (SO2), nitrogen dioxide (NOX), and particulate matter (PM) BART determinations for the Arkansas Electric Cooperative Corporation Bailey Plant Unit 1 and the AECC McClellan Plant Unit 1;

(ii) The SO2 and NOX BART determinations for the American Electric Power Flint Creek Plant Boiler No. 1;

(iii) The NOX BART determination for the natural gas firing scenario and the SO2, NOX, and PM BART determinations for the fuel oil firing scenario for the Entergy Lake Catherine Plant Unit 4;

(iv) The SO2 and NOX BART determinations for both the bituminous and sub-bituminous coal firing scenarios for the Entergy White Bluff Plant Units 1 and 2;

(v) The BART determination for the Entergy White Bluff Plant Auxiliary Boiler;

(vi) The SO2 and NOX BART determinations for the Domtar Ashdown Mill Power Boiler No. 1; and

(vii) The SO2, NOX and PM BART determinations for the Domtar Ashdown Mill Power Boiler No. 2.

(4) The Arkansas Regional Haze Rule, (APCEC Regulation 19, Chapter 15), is partially approved and partially disapproved such that:

(i) The requirement under Reg. 19.104(B) for BART installation and operation as expeditiously as practicable, but no later than 5 years after EPA approval of the Arkansas Regional Haze State Implementation Plan is partially approved and partially disapproved, such that the partial approval is for the BART determinations we are approving and the partial disapproval is for the BART determinations we are disapproving;

(ii) The requirement under Reg. 19.1504(B) for BART installation and operation no later than 6 years after the effective date of the State regulation is disapproved;

(iii) Reg. 19.1505 (A)(1) and (2), (B), (C), (D)(1) and (2), (E), (F)(1) and (2), (G)(1) and (2), (H), (I)(1) and (2), (J)(1) and (2), (K), (L), (M)(1), and (N) are disapproved;

(iv) the Reg. 19.1506 requirement to demonstrate compliance with the BART limits listed in Reg. 19.1505 (A)(1) and (2), (B), (C), (D)(1) and (2), (E), (F)(1) and (2), (G)(1) and (2), (H), (I)(1) and (2), (J)(1) and (2), (K), (L), (M)(1), and (N) is disapproved; and

(v) The remaining portions are approved.

(5) The regional haze long term strategy under 40 CFR 51.308(d)(3) is partially approved and partially disapproved.

(6) The reasonable progress goals are disapproved.

(b) Interstate Transport. The portion of the SIP pertaining to adequate provisions to prohibit emissions from interfering with measures required in another state to protect visibility, submitted on March 28, 2008, and supplemented on September 27, 2011, is partially approved and partially disapproved.

(1) The Arkansas Regional Haze Rule, (APCEC Regulation 19, Chapter 15), is partially approved and partially disapproved such that:

(i) The requirement under Reg. 19.104(B) for BART installation and operation as expeditiously as practicable, but no later than 5 years after EPA approval of the Arkansas Regional Haze State Implementation Plan is partially approved and partially disapproved, such that the partial approval is for the BART determinations we are approving and the partial disapproval is for the BART determinations we are disapproving;

(ii) The requirement under Reg. 19.1504(B) for BART installation and operation no later than 6 years after the effective date of the State regulation is disapproved;

(iii) Reg. 19.1505 (A)(1) and (2), (B), (C), (D)(1) and (2), (E), (F)(1) and (2), (G)(1) and (2), (H), (I)(1) and (2), (J)(1) and (2), (K), (L), (M)(1), and (N) are disapproved;

(iv) The Reg. 19.1506 requirement to demonstrate compliance with the BART limits listed in Reg. 19.1505 (A)(1) and (2), (B), (C), (D)(1) and (2), (E), (F)(1) and (2), (G)(1) and (2), (H), (I)(1) and (2), (J)(1) and (2), (K), (L), (M)(1), and (N) is disapproved; and

(v) The remaining portions are approved.

(c) Federal implementation plan for regional haze. Requirements for AECC Carl E. Bailey Unit 1; AECC John L. McClellan Unit 1; AEP Flint Creek Unit 1; Entergy White Bluff Units 1, 2, and Auxiliary Boiler; Entergy Lake Catherine Unit 4; Domtar Ashdown Paper Mill Power Boilers No. 1 and 2; and Entergy Independence Units 1 and 2 affecting visibility.

(1) Applicability. The provisions of this section shall apply to each owner or operator, or successive owners or operators, of the sources designated as: AECC Carl E. Bailey Unit 1; AECC John L. McClellan Unit 1; AEP Flint Creek Unit 1; Entergy White Bluff Units 1, 2, and Auxiliary Boiler; Entergy Lake Catherine Unit 4; Domtar Ashdown Paper Mill Power Boilers No. 1 and 2; and Entergy Independence Units 1 and 2.

(2) Definitions. All terms used in this part but not defined herein shall have the meaning given them in the Clean Air Act and in parts 51 and 60 of this title. For the purposes of this section:

24-hour period means the period of time between 12:01 a.m. and 12 midnight.

Air pollution control equipment includes selective catalytic control units, baghouses, particulate or gaseous scrubbers, and any other apparatus utilized to control emissions of regulated air contaminants which would be emitted to the atmosphere.

Boiler-operating-day for electric generating units listed under paragraph (c)(1) of this section means any 24-hour period between 12 midnight and the following midnight during which any fuel is combusted at any time at the steam generating unit, unless otherwise specified. For power boilers listed under paragraph (c)(1) of this section, we define boiler-operating-day as a 24-hr period between 6 a.m. and 6 a.m. the following day during which any fuel is fed into and/or combusted at any time in the power boiler.

Daily average means the arithmetic average of the hourly values measured in a 24-hour period.

Heat input means heat derived from combustion of fuel in a unit and does not include the heat input from preheated combustion air, recirculated flue gases, or exhaust gases from other sources. Heat input shall be calculated in accordance with 40 CFR part 75.

Owner or Operator means any person who owns, leases, operates, controls, or supervises any of the units or power boilers listed under paragraph (c)(1) of this section.

Regional Administrator means the Regional Administrator of EPA Region 6 or his/her authorized representative.

Unit means one of the natural gas, fuel oil, or coal fired boilers covered under paragraph (c) of this section.

(3) Emissions limitations for AECC Bailey Unit 1 and AECC McClellan Unit 1. The individual SO2 and PM emission limits for each unit are as listed in the table in this paragraph (c)(3).

(4) Compliance dates for AECC Bailey Unit 1 and AECC McClellan Unit 1. The owner or operator of each unit must comply with the SO2 and PM requirements listed in paragraph (c)(3) of this section by October 27, 2021. As of October 27, 2016, the owner or operator of each unit shall not purchase fuel for combustion at the unit that does not meet the sulfur content limit in paragraph (c)(3) of this section. The owner or operator of each unit must comply with the requirement in paragraph (c)(3) of this section to burn only fuel with a sulfur content limit of 0.5% by weight by October 27, 2021.

(5) Compliance determination and reporting and recordkeeping requirements for AECC Bailey Unit 1 and AECC McClellan Unit 1 for SO4 and PM. To determine compliance with the SO2 and PM requirements listed in paragraph (c)(3) of this section, the owner or operator shall sample and analyze each shipment of fuel to determine the sulfur content by weight, except for natural gas shipments. A “shipment” is considered delivery of the entire amount of each order of fuel purchased. Fuel sampling and analysis may be performed by the owner or operator of an affected unit, an outside laboratory, or a fuel supplier. All records pertaining to the sampling of each shipment of fuel as described in this paragraph (c)(5), including the results of the sulfur content analysis, must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives.

(6) Emissions limitations for AEP Flint Creek Unit 1 and Entergy White Bluff Units 1 and 2. The individual SO2 emission limits for each unit are as listed in the table in this paragraph (c)(6), as specified in pounds per million British thermal units (lb/MMBtu). The SO2 emission limits of 0.06 lb/MMBtu are on a rolling 30 boiler-operating-day averaging period.

(7) Compliance dates for AEP Flint Creek Unit 1 and Entergy White Bluff Units 1 and 2. The owner or operator of AEP Flint Creek Unit 1 must comply with the SO2 emission limit listed in paragraph (c)(6) of this section by April 27, 2018. The owner or operator of White Bluff Units 1 and 2 must comply with the SO2 emission limit listed in paragraph (c)(6) of this section by October 27, 2021.

(8) Compliance determination and reporting and recordkeeping requirements for AEP Flint Creek Unit 1 and Entergy White Bluff Units 1 and 2. (i) For purposes of determining compliance with the SO2 emission limit listed in paragraph (c)(6) of this section for AEP Flint Creek Unit 1 and with the SO2 emission limits listed in paragraph (c)(6) of this section for White Bluff Units 1 and 2, the emissions for each boiler-operating-day for each unit shall be determined by summing the hourly emissions measured in pounds of SO2. For each unit, heat input for each boiler-operating-day shall be determined by adding together all hourly heat inputs, in millions of BTU. Each boiler-operating-day of the 30-day rolling average for a unit shall be determined by adding together the pounds of SO2 from that day and the preceding 29 boiler-operating-days and dividing the total pounds of SO2 by the sum of the heat input during the same 30 boiler-operating-day period. The result shall be the 30 boiler-operating-day rolling average in terms of lb/MMBtu emissions of SO2. If a valid SO2 pounds per hour or heat input is not available for any hour for a unit, that heat input and SO2 pounds per hour shall not be used in the calculation of the 30 boiler-operating-day rolling average for SO2. For each day, records of the total SO2 emitted that day by each emission unit and the sum of the hourly heat inputs for that day must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Records of the 30 boiler-operating-day rolling average for SO2 for each unit as described in this paragraph (c)(8)(i) must be maintained by the owner or operator for each boiler-operating-day and made available upon request to EPA and ADEQ representatives.

(ii) The owner or operator shall continue to maintain and operate a CEMS for SO2 on the units listed in paragraph (c)(6) of this section in accordance with 40 CFR 60.8 and 60.13(e), (f), and (h), and appendix B of 40 CFR part 60. The owner or operator shall comply with the quality assurance procedures for CEMS found in 40 CFR part 75. Compliance with the emission limits for SO2 shall be determined by using data from a CEMS.

(iii) Continuous emissions monitoring shall apply during all periods of operation of the units listed in paragraph (c)(6) of this section, including periods of startup, shutdown, and malfunction, except for CEMS breakdowns, repairs, calibration checks, and zero and span adjustments. Continuous monitoring systems for measuring SO2 and diluent gas shall complete a minimum of one cycle of operation (sampling, analyzing, and data recording) for each successive 15-minute period. Hourly averages shall be computed using at least one data point in each fifteen-minute quadrant of an hour. Notwithstanding this requirement, an hourly average may be computed from at least two data points separated by a minimum of 15 minutes (where the unit operates for more than one quadrant in an hour) if data are unavailable as a result of performance of calibration, quality assurance, preventive maintenance activities, or backups of data from data acquisition and handling system, and recertification events. When valid SO2 pounds per hour emission data are not obtained because of continuous monitoring system breakdowns, repairs, calibration checks, or zero and span adjustments, emission data must be obtained by using other monitoring systems approved by the EPA to provide emission data for a minimum of 18 hours in each 24-hour period and at least 22 out of 30 successive boiler operating days.

(9) Emissions limitations for Entergy White Bluff Auxiliary Boiler. The individual SO2 and PM emission limits for the unit are as listed in the table in this paragraph (c)(9) in pounds per hour (lb/hr).

(10) Compliance dates for Entergy White Bluff Auxiliary Boiler. The owner or operator of the unit must comply with the SO2 and PM emission limits listed in paragraph (c)(9) of this section by October 27, 2016.

(11) Compliance determination and reporting and recordkeeping requirements for Entergy White Bluff Auxiliary Boiler. For purposes of demonstrating compliance with the emission limits listed in paragraph (c)(9) of this section, records of fuel oil analysis must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives.

(12) Emissions limitations for Entergy Lake Catherine Unit 4. The unit must not burn fuel oil until BART determinations are promulgated for the unit for SO2 and PM for the fuel oil firing scenario through a FIP and/or through EPA action upon and approval of revised BART determinations submitted by the State as a SIP revision.

(13) Emissions Limitations for Domtar Ashdown Paper Mill Power Boiler No. 1. The SO2 emission limit for the boiler is as listed in the following table in pounds per day (lb/day) as averaged over a rolling 30 boiler-operating-day period. The NOX emission limit for the boiler is as listed in the following table in pounds per hour (lb/hr).

(14) Compliance dates for Domtar Ashdown Mill Power Boiler No. 1. The owner or operator of the boiler must comply with the SO2 and NOX emission limits listed in paragraph (c)(13) of this section by November 28, 2016.

(15) Compliance determination and reporting and recordkeeping requirements for Domtar Ashdown Paper Mill Power Boiler No. 1. (i)(A) SO2 emissions resulting from combustion of fuel oil shall be determined by assuming that the SO2 content of the fuel delivered to the fuel inlet of the combustion chamber is equal to the SO2 being emitted at the stack. The owner or operator must maintain records of the sulfur content by weight of each fuel oil shipment, where a “shipment” is considered delivery of the entire amount of each order of fuel purchased. Fuel sampling and analysis may be performed by the owner or operator, an outside laboratory, or a fuel supplier. All records pertaining to the sampling of each shipment of fuel oil, including the results of the sulfur content analysis, must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. SO2 emissions resulting from combustion of bark shall be determined by using the following site-specific curve equation, which accounts for the SO2 scrubbing capabilities of bark combustion:

Y= 0.4005 * X − 0.2645

(B) The owner or operator must confirm the site-specific curve equation through stack testing. By October 27, 2017, the owner or operator must provide a report to EPA showing confirmation of the site-specific curve equation accuracy. Records of the quantity of fuel input to the boiler for each fuel type for each day must be compiled no later than 15 days after the end of the month and must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Each boiler-operating-day of the 30-day rolling average for the boiler must be determined by adding together the pounds of SO2 from that boiler-operating-day and the preceding 29 boiler-operating-days and dividing the total pounds of SO2 by the sum of the total number of boiler operating days (i.e., 30). The result shall be the 30 boiler-operating-day rolling average in terms of lb/day emissions of SO2. Records of the total SO2 emitted for each day must be compiled no later than 15 days after the end of the month and must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Records of the 30 boiler-operating-day rolling averages for SO2 as described in this paragraph (c)(15)(i) must be maintained by the owner or operator for each boiler-operating-day and made available upon request to EPA and ADEQ representatives.

(ii) If the air permit is revised such that Power Boiler No. 1 is permitted to burn only pipeline quality natural gas, this is sufficient to demonstrate that the boiler is complying with the SO2 emission limit under paragraph (c)(13) of this section. The compliance determination requirements and the reporting and recordkeeping requirements under paragraph (c)(15)(i) of this section would not apply and confirmation of the accuracy of the site-specific curve equation under paragraph (c)(15)(i)(B) of this section through stack testing would not be required so long as Power Boiler No. 1 is only permitted to burn pipeline quality natural gas.

(iii) To demonstrate compliance with the NOX emission limit under paragraph (c)(13) of this section, the owner or operator shall conduct stack testing using EPA Reference Method 7E, found at 40 CFR part 60, appendix A, once every 5 years, beginning October 27, 2017. Records and reports pertaining to the stack testing must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives.

(iv) If the air permit is revised such that Power Boiler No. 1 is permitted to burn only pipeline quality natural gas, the owner or operator may demonstrate compliance with the NOX emission limit under paragraph (c)(13) of this section by calculating NOX emissions using fuel usage records and the applicable NOX emission factor under AP-42, Compilation of Air Pollutant Emission Factors, section 1.4, Table 1.4-1. Records of the quantity of natural gas input to the boiler for each day must be compiled no later than 15 days after the end of the month and must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Records of the calculation of NOX emissions for each day must be compiled no later than 15 days after the end of the month and must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Each boiler-operating-day of the 30-day rolling average for the boiler must be determined by adding together the pounds of NOX from that day and the preceding 29 boiler-operating-days and dividing the total pounds of NOX by the sum of the total number of hours during the same 30 boiler-operating-day period. The result shall be the 30 boiler-operating-day rolling average in terms of lb/hr emissions of NOX. Records of the 30 boiler-operating-day rolling average for NOX must be maintained by the owner or operator for each boiler-operating-day and made available upon request to EPA and ADEQ representatives. Under these circumstances, the compliance determination requirements and the reporting and recordkeeping requirements under paragraph (c)(15)(iii) of this section would not apply.

(16) SO2 and NOX Emissions Limitations for Domtar Ashdown Paper Mill Power Boiler No.2. The individual SO2 and NOX emission limits for the boiler are as listed in the following table in pounds per hour (lb/hr) as averaged over a rolling 30 boiler-operating-day period.

(17) SO2 and NOX Compliance dates for Domtar Ashdown Mill Power Boiler No. 2. The owner or operator of the boiler must comply with the SO2 and NOX emission limits listed in paragraph (c)(16) of this section by October 27, 2021.

(18) SO2 and NOX Compliance determination and reporting and recordkeeping requirements for Domtar Ashdown Mill Power Boiler No. 2. (i) NOX and SO2 emissions for each day shall be determined by summing the hourly emissions measured in pounds of NOX or pounds of SO2. Each boiler-operating-day of the 30-day rolling average for the boiler shall be determined by adding together the pounds of NOX or SO2 from that day and the preceding 29 boiler-operating-days and dividing the total pounds of NOX or SO2 by the sum of the total number of hours during the same 30 boiler-operating-day period. The result shall be the 30 boiler-operating-day rolling average in terms of lb/hr emissions of NOX or SO2. If a valid NOX pounds per hour or SO2 pounds per hour is not available for any hour for the boiler, that NOX pounds per hour shall not be used in the calculation of the 30 boiler-operating-day rolling average for NOX. For each day, records of the total SO2 and NOX emitted for that day by the boiler must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Records of the 30 boiler-operating-day rolling average for SO2 and NOX for the boiler as described in this paragraph (c)(18)(i) must be maintained by the owner or operator for each boiler-operating-day and made available upon request to EPA and ADEQ representatives.

(ii) The owner or operator shall continue to maintain and operate a CEMS for SO2 and NOX on the boiler listed in paragraph (c)(16) of this section in accordance with 40 CFR 60.8 and 60.13(e), (f), and (h), and appendix B of 40 CFR part 60. The owner or operator shall comply with the quality assurance procedures for CEMS found in 40 CFR part 60. Compliance with the emission limits for SO2 and NOX shall be determined by using data from a CEMS.

(iii) Continuous emissions monitoring shall apply during all periods of operation of the boiler listed in paragraph (c)(16) of this section, including periods of startup, shutdown, and malfunction, except for CEMS breakdowns, repairs, calibration checks, and zero and span adjustments. Continuous monitoring systems for measuring SO2 and NOX and diluent gas shall complete a minimum of one cycle of operation (sampling, analyzing, and data recording) for each successive 15-minute period. Hourly averages shall be computed using at least one data point in each fifteen-minute quadrant of an hour. Notwithstanding this requirement, an hourly average may be computed from at least two data points separated by a minimum of 15 minutes (where the unit operates for more than one quadrant in an hour) if data are unavailable as a result of performance of calibration, quality assurance, preventive maintenance activities, or backups of data from data acquisition and handling system, and recertification events. When valid SO2 or NOX pounds per hour emission data are not obtained because of continuous monitoring system breakdowns, repairs, calibration checks, or zero and span adjustments, emission data must be obtained by using other monitoring systems approved by the EPA to provide emission data for a minimum of 18 hours in each 24-hour period and at least 22 out of 30 successive boiler operating days.

(iv) If the air permit is revised such that Power Boiler No. 2 is permitted to burn only pipeline quality natural gas, this is sufficient to demonstrate that the boiler is complying with the SO2 emission limit under paragraph (c)(16) of this section. Under these circumstances, the compliance determination requirements under paragraphs (c)(18)(i) through (iii) of this section would not apply to the SO2 emission limit listed in paragraph (c)(16) of this section.

(v) If the air permit is revised such that Power Boiler No. 2 is permitted to burn only pipeline quality natural gas and the operation of the CEMS is not required under other applicable requirements, the owner or operator may demonstrate compliance with the NOX emission limit under paragraph (c)(16) of this section by calculating NOX emissions using fuel usage records and the applicable NOX emission factor under AP-42, Compilation of Air Pollutant Emission Factors, section 1.4, Table 1.4-1. Records of the quantity of natural gas input to the boiler for each day must be compiled no later than 15 days after the end of the month and must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Records of the calculation of NOX emissions for each day must be compiled no later than 15 days after the end of the month and must be maintained and made available upon request to EPA and ADEQ representatives. Each boiler-operating-day of the 30-day rolling average for the boiler must be determined by adding together the pounds of NOX from that day and the preceding 29 boiler-operating-days and dividing the total pounds of NOX by the sum of the total number of hours during the same 30 boiler-operating-day period. The result shall be the 30 boiler-operating-day rolling average in terms of lb/hr emissions of NOX. Records of the 30 boiler-operating-day rolling average for NOX must be maintained by the owner or operator for each boiler-operating-day and made available upon request to EPA and ADEQ representatives. Under these circumstances, the compliance determination requirements under paragraphs (c)(18)(i) through (iii) of this section would not apply to the NOX emission limit.

(19) PM BART Requirements for Domtar Ashdown Paper Mill Power Boiler No.2. The owner or operator must rely on the applicable PM standard required under 40 CFR part 63, subpart DDDDD—National Emission Standards for Hazardous Air Pollutants for Major Sources: Industrial, Commercial, and Institutional Boilers and Process Heaters, as revised, to satisfy the PM BART requirement. Compliance with the applicable PM standard under 40 CFR part 63 subpart DDDDD, as revised, shall demonstrate compliance with the PM BART requirement.

(20) PM compliance dates for Domtar Ashdown Mill Power Boiler No. 2. The owner or operator of the boiler must comply with the PM BART requirement listed in paragraph (c)(19) of this section by November 28, 2016.

(21) Alternative PM Compliance Determination for Domtar Ashdown Paper Mill Power Boiler No.2. If the air permit is revised such that Power Boiler No. 2 is permitted to burn only pipeline quality natural gas, this is sufficient to demonstrate that the boiler is complying with the PM BART requirement under paragraph (c)(19) of this section.

(22) Emissions limitations for Entergy Independence Units 1 and 2. The individual emission limits for each unit are as listed in the table in this paragraph (c)(22) in pounds per million British thermal units (lb/MMBtu). The SO2 emission limits listed in the table as lb/MMBtu are on a rolling 30 boiler-operating-day averaging period.

(23) Compliance dates for Entergy Independence Units 1 and 2. The owner or operator of each unit must comply with the SO2 emission limits in paragraph (c)(22) of this section by October 27, 2021.

(24) Compliance determination and reporting and recordkeeping requirements for Entergy Independence Units 1 and 2. (i) For purposes of determining compliance with the SO2 emissions limit listed in paragraph (c)(22) of this section for each unit, the SO2 emissions for each boiler-operating-day shall be determined by summing the hourly emissions measured in pounds of SO2. For each unit, heat input for each boiler-operating-day shall be determined by adding together all hourly heat inputs, in millions of BTU. Each boiler-operating-day of the thirty-day rolling average for a unit shall be determined by adding together the pounds of SO2 from that day and the preceding 29 boiler-operating-days and dividing the total pounds of SO2 by the sum of the heat input during the same 30 boiler-operating-day period. The result shall be the 30 boiler-operating-day rolling average in terms of lb/MMBtu emissions of SO2. If a valid SO2 pounds per hour or heat input is not available for any hour for a unit, that heat input and SO2 pounds per hour shall not be used in the calculation of the applicable 30 boiler-operating-days rolling average. For each day, records of the total SO2 emitted that day by each emission unit and the sum of the hourly heat inputs for that day must be maintained by the owner or operator and made available upon request to EPA and ADEQ representatives. Records of the 30 boiler-operating-day rolling average for each unit as described in this paragraph (c)(24)(i) must be maintained by the owner or operator for each boiler-operating-day and made available upon request to EPA and ADEQ representatives.

(ii) The owner or operator shall continue to maintain and operate a CEMS for SO2 on the units listed in paragraph (c)(22) in accordance with 40 CFR 60.8 and 60.13(e), (f), and (h), and appendix B of 40 CFR part 60. The owner or operator shall comply with the quality assurance procedures for CEMS found in 40 CFR part 75. Compliance with the emission limits for SO2 shall be determined by using data from a CEMS.

(iii) Continuous emissions monitoring shall apply during all periods of operation of the units listed in paragraph (c)(22) of this section, including periods of startup, shutdown, and malfunction, except for CEMS breakdowns, repairs, calibration checks, and zero and span adjustments. Continuous monitoring systems for measuring SO2 and diluent gas shall complete a minimum of one cycle of operation (sampling, analyzing, and data recording) for each successive 15-minute period. Hourly averages shall be computed using at least one data point in each fifteen-minute quadrant of an hour. Notwithstanding this requirement, an hourly average may be computed from at least two data points separated by a minimum of 15 minutes (where the unit operates for more than one quadrant in an hour) if data are unavailable as a result of performance of calibration, quality assurance, preventive maintenance activities, or backups of data from data acquisition and handling system, and recertification events. When valid SO2 pounds per hour emission data are not obtained because of continuous monitoring system breakdowns, repairs, calibration checks, or zero and span adjustments, emission data must be obtained by using other monitoring systems approved by the EPA to provide emission data for a minimum of 18 hours in each 24-hour period and at least 22 out of 30 successive boiler operating days.

(25) Reporting and recordkeeping requirements. Unless otherwise stated all requests, reports, submittals, notifications, and other communications to the Regional Administrator required under paragraph (c) of this section shall be submitted, unless instructed otherwise, to the Director, Multimedia Planning and Permitting Division, U.S. Environmental Protection Agency, Region 6, to the attention of Mail Code: 6PD, at 1445 Ross Avenue, Suite 1200, Dallas, Texas 75202-2733. For each unit subject to the emissions limitation under paragraph (c) of this section, the owner or operator shall comply with the following requirements, unless otherwise specified:

(i) For each emissions limit under paragraph (c) of this section where compliance shall be determined by using data from a CEMS, comply with the notification, reporting, and recordkeeping requirements for CEMS compliance monitoring in 40 CFR 60.7(c) and (d).

(ii) [Reserved]

(26) Equipment operations. At all times, including periods of startup, shutdown, and malfunction, the owner or operator shall, to the extent practicable, maintain and operate the unit including associated air pollution control equipment in a manner consistent with good air pollution control practices for minimizing emissions. Determination of whether acceptable operating and maintenance procedures are being used will be based on information available to the Regional Administrator which may include, but is not limited to, monitoring results, review of operating and maintenance procedures, and inspection of the unit.

(27) Enforcement. (i) Notwithstanding any other provision in this implementation plan, any credible evidence or information relevant as to whether the unit would have been in compliance with applicable requirements if the appropriate performance or compliance test had been performed, can be used to establish whether or not the owner or operator has violated or is in violation of any standard or applicable emission limit in the plan.

(ii) Emissions in excess of the level of the applicable emission limit or requirement that occur due to a malfunction shall constitute a violation of the applicable emission limit.

(d) Measures Addressing Partial Disapproval of Portion of Interstate Visibility Transport SIP for the 1997 8-hour ozone and PM2.5 NAAQS. The deficiencies identified in EPA's partial disapproval of the portion of the SIP pertaining to adequate provisions to prohibit emissions in Arkansas from interfering with measures required in another state to protect visibility, submitted on March 28, 2008, and supplemented on September 27, 2011 are satisfied by §52.173.

(e) Measures addressing best available retrofit technology (BART) for electric generating unit (EGU) emissions of nitrogen oxides (NOX). The BART requirements for EGU NOX emissions are satisfied by §52.184 and the Arkansas Regional Haze NOX SIP Revision approved February 12, 2018, 83 FR 5927.

(f) Other measures addressing reasonable progress. The reasonable progress requirements for NOX emissions are satisfied by the Arkansas Regional Haze NOX SIP Revision approved February 12, 2018.

[77 FR 14676, Mar. 12, 2012, as amended at 81 FR 66415, Sept. 27, 2016; 82 FR 18995, Apr. 25, 2017; 83 FR 5917, 5940, Feb. 12, 2018]

(a) The EPA has determined that the Crittenden County Marginal 2008 ozone NAAQS nonattainment area attained the NAAQS by the applicable attainment date of July 20, 2015.

(b) [Reserved]

[81 FR 26708, May 4, 2016]

(a) The plan submitted by the Governor of Arkansas as follows:

(1) April 23, 1981—submittal of the PSD Supplement Arkansas Plan of Implementation for Pollution Control (the “PSD Supplement”) submitted April 23, 1981 (as adopted by the Arkansas Commission on Pollution Control and Ecology (ACPCE) on April 10, 1981);

(2) June 3, 1988—submittal of revisions to the PSD Supplement (revised and adopted by the ACPCE on March 25, 1988);

(3) June 19, 1990—submittal of revisions to the PSD Supplement (revised and adopted by the ACPCE on May 25, 1990), and;

(4) March 5, 1999—submittal of Regulation 19, Chapter 9, Prevention of Significant Deterioration which recodified Arkansas' PSD regulations (as adopted by the Arkansas Pollution Control and Ecology Commission on January 22, 1999)

(5) November 6, 2012—submittal of Regulation 19, Chapter 9, Prevention of Significant Deterioration which provided the authority to regulate greenhouse gas emissions in the Arkansas PSD program.

(6) January 7, 2014—submittal of Regulation 19, Chapter 9, Prevention of Significant Deterioration which updated the Arkansas PSD program to provide for the issuance of greenhouse gas plantwide applicability limit permits.

(7) December 1, 2014—submittal of Regulation 19, Chapter 9, Prevention of Significant Deterioration which provided the authority to regulate and permit emissions of PM2.5 and its precursors.

(b) The requirements of sections 160 through 165 of the Clean Air Act are not met for federally designated Indian lands. Therefore, the provisions of §52.21 except paragraph (a)(1) are hereby incorporated and made a part of the applicable implementation plan and are applicable to sources located on land under the control of Indian governing bodies.

[56 FR 20139, May 2, 1991, as amended at 63 FR 17683, Apr. 10, 1998; 63 FR 32981, June 17, 1998; 65 FR 61108, Oct. 16, 2000; 68 FR 11322, Mar. 10, 2003; 68 FR 74488, Dec. 24, 2003; 80 FR 11577, Mar. 4, 2015; 80 FR 38628, July 7, 2015]

The Governor of Arkansas submitted on November 6, 1992, a plan revision to develop and implement a Small Business Stationary Source Technical and Environmental Compliance Assistance Program (PROGRAM) to meet the requirements of section 507 of the Clean Air Act by November 15, 1994. The plan commits to provide technical and compliance assistance to small businesses, hire an Ombudsman to serve as an independent advocate for small businesses, and establish a Compliance Advisory Panel to advise the program and report to the EPA on the program's effectiveness. On April 23, 1993, the Governor submitted Act 251 of 1993 which establishes the Compliance Advisory Panel for the PROGRAM.

[60 FR 12695, Mar. 8, 1995]

(a) The owner and operator of each source and each unit located in the State of Arkansas and for which requirements are set forth under the CSAPR NOX Ozone Season Group 1 Trading Program in subpart BBBBB of part 97 of this chapter must comply with such requirements with regard to emissions occurring in 2015 and 2016.

(b) The owner and operator of each source and each unit located in the State of Arkansas and for which requirements are set forth under the CSAPR NOX Ozone Season Group 2 Trading Program in subpart EEEEE of part 97 of this chapter must comply with such requirements with regard to emissions occurring in 2017 and each subsequent year. The obligation to comply with such requirements will be eliminated by the promulgation of an approval by the Administrator of a revision to Arkansas' State Implementation Plan (SIP) as correcting the SIP's deficiency that is the basis for the CSAPR Federal Implementation Plan (FIP) under §52.38(b), except to the extent the Administrator's approval is partial or conditional.

(c) Notwithstanding the provisions of paragraph (b) of this section, if, at the time of the approval of Arkansas' SIP revision described in paragraph (b) of this section, the Administrator has already started recording any allocations of CSAPR NOX Ozone Season Group 2 allowances under subpart EEEEE of part 97 of this chapter to units in the State for a control period in any year, the provisions of subpart EEEEE of part 97 of this chapter authorizing the Administrator to complete the allocation and recordation of CSAPR NOX Ozone Season Group 2 allowances to units in the State for each such control period shall continue to apply, unless provided otherwise by such approval of the State's SIP revision.

[81 FR 74594, Oct. 26, 2016, as amended at 83 FR 65924, Dec. 21, 2018]

(a) This section identifies the original “Arkansas Plan for Implementation for Air Pollution Control” and all revisions submitted by Arkansas that were federally approved prior to July 1, 1998.

(b) The plan was officially submitted on January 28, 1972.

(c) The plan revisions listed below were submitted on the dates specified.

(1) A certification that the public hearings on the plan were held was submitted by the State Department of Pollution Control and Ecology on January 25, 1972. (Non-regulatory)

(2) State Department of Pollution Control and Ecology letter outlining projected emission reductions, ASA forecasts, source surveillance, legal authority and interstate cooperation was submitted on February 24, 1972. (Non-regulatory)

(3) Revision of section 16 of the State air code was submitted by the Department of Pollution Control and Ecology on July 7, 1972.

(4) June 27, 1975, letter from the Governor submitting sections 1 through 10 of the Regulations and Strategy of the Arkansas Plan of Implementation for Air Pollution Control except those portions relating to delegation of authority to enforce Federal requirements.

(5) August 16, 1976, statement issued by Director of the Arkansas Department of Pollution Control and Ecology specifying the test and reference methods for determining compliance with emission limitations.

(6) Administrative changes to the Arkansas Air Quality Surveillance Network were submitted by the Arkansas Department of Pollution Control and Ecology on February 15, 1977, January 10, 1978, and March 27, 1978. (Non-regulatory.)

(7) On April 4, 1979, the Governor submitted the nonattainment area plan for the area designated nonattainment as of March 3, 1978.

(8) On August 14, 1979, the Governor submitted supplemental information clarifying the plan.

(9) Revisions to Arkansas Regulation 4.5(a) for the “Control of Volatile Organic Compounds” showing a final compliance date of June 1, 1981, was submitted by the Arkansas Governor on December 10, 1979.

(10) A modification to the definition for lowest achievable emission rate (LAER), consistent with the definition contained in section 171(3) of the Act, was submitted by the Arkansas Governor on December 10, 1979.

(11) On July 11, 1979, the Governor submitted revisions to section 6(a) malfunction or upset and section 7(e) continuous emission monitoring of the Arkansas Regulations.

(12) Revisions to section 3 (i.e., 3.(a), (b), (k), (l), (n), (o), (z), (bb), (dd), (ee), (ff), and (gg)), section 4 (i.e., 4.1(b), 4.2(a), 4.5(a)(1), 4.5(a)(2), 4.6(c), and 4.6(d)), and section 5 (i.e., 5.4 and 5.5) were adopted by the Arkansas Commission on Pollution Control and Ecology on September 26, 1980 and submitted by the Governor on October 10, 1980.

(13) Revisions to section 3 (i.e., 3.(ii) through 3.(nn)), section 4 (i.e., 4.1, 4.5(a)(1), 4.5(a)(2), and 4.6(e)), and section 5 (i.e., 5.6) of the Arkansas Regulations for the Control of Volatile Organic Compounds were adopted by the Arkansas Commission on Pollution Control and Ecology on April 10, 1981 and submitted by the Governor on April 23, 1981.

(14) A variance to Regulation 8 for Weyerhaeuser Gypsum Plant in Nashville, Arkansas was submitted by the Governor on June 29, 1981.

(15) On April 23, 1981, the Governor submitted revisions to the plan to incorporate Federal Prevention of Significant Deterioration (PSD) Regulations 40 CFR 52.21 by reference.

(16) On September 11, 1981, the Governor submitted a revision to section 8 of the Regulations of the Arkansas Plan of Implementation for Air Pollution Control which implements an emission limit for Energy Systems Company of El Dorado, Arkansas.

(17) The Arkansas State Implementation Plan for lead was submitted to EPA on December 10, 1979, by the Governor of Arkansas as adopted by the Arkansas Department of Pollution Control and Ecology on November 16, 1979. A letter of clarification dated January 5, 1982, also was submitted.

(18) Revisions to the plan for intergovernmental consultation, interstate pollution abatement, and composition of the Arkansas Commission on Pollution Control and Ecology were submitted to EPA by the Arkansas Department of Pollution Control and Ecology on January 9, 1980.

(19) Revision to the plan for maintenance of employee pay was submitted to EPA by the Arkansas Department of Pollution Control and Ecology on January 9, 1980.

(20) On April 24, 1980, the Governor submitted final revisions to the ambient monitoring portion of the plan.

(21) On December 10, 1979, the Governor submitted a revision to Section 5.1(a) of the Regulation of the Arkansas Plan of Implementation for Air Pollution Control, which controls VOC emissions. This revision was adopted by the Arkansas Commission on Pollution Control and Ecology on November 16, 1979.

(22) On July 12, 1985, the Governor submitted a revision entitled, “Protection of Visibility in Mandatory Class I Federal Areas, May 6, 1985.” This submittal included new source review regulations and visibility monitoring strategy as adopted by the Arkansas Commission on Pollution Control and Ecology on May 24, 1985.

(i) Incorporation by reference. (A) New source review regulations include amendments to rules and regulations of the Arkansas Department of Pollution Control and Ecology entitled, “Prevention of Significant Deterioration Supplement to the Arkansas Plan of Implementation for Air Pollution Control,” Sections 1 through 6, adopted on May 24, 1985.

(B) Arkansas Department of Pollution Control and Ecology Minute Order No. 85-12, adopted May 24, 1985.

(ii) Additional material. (A) Narrative submittal, including introduction, and visibility monitoring strategy.

(23) A revision to the Arkansas Plan of Implementation of Air Pollution Control was submitted by the Governor on November 25, 1985.

(i) Incorporation by reference. (A) Act 763 of 1985 (public availability of emission data) approved April 3, 1985. Act 763 of 1985 amends section 82-1937 (Industrial secrets confidential—Revealing a misdemeanor) of the Arkansas Water and Air Pollution Control Act.

(24) A revision to the Arkansas Plan of Implementation for Air Pollution Control was submitted by the Governor on December 16, 1985.

(i) Incorporation by reference. (A) Act 817 of 1983 (permit fees) adopted March 25, 1983. Act 817 of 1983 added sections 82-1916 thru 82-1921 to the Arkansas Statutes. (B) Arkansas Department of Pollution Control and Ecology Regulation No. 9 (Regulations for Development and Implementation of a Permit Fee System for Environmental Permits) adopted by the Arkansas Commission on Pollution Control and Ecology on November 16, 1984. Only those portions of Regulation No. 9 related to air permits are incorporated.

(25) Part II of the Visibility Protection Plan was submitted by the Governor on October 9, 1987.

(i) Incorporation by reference. (A) Revision entitled “Arkansas Plan of Implementation for Air Pollution Control—Revision: Protection of Visibility in Mandatory Class I Federal Areas: Part II—Long-Term Strategy, September 29, 1987”. This submittal includes a visibility long-term strategy and general plan provisions as adopted by the Arkansas Commission on Pollution Control and Ecology on September 25, 1987.

(B) Arkansas Department of Pollution Control and Ecology, Minute Order No. 87-24, adopted September 25, 1987.

(ii) Additional material. (A) None.

(26) A revision to the Arkansas Plan of Implementation for Air Pollution Control, as adopted by the Arkansas Commission on Pollution Control and Ecology on May 22, 1987, was submitted by the Governor of Arkansas on July 1, 1987. This revision adds the definitions and dispersion technique regulations required to implement the Federal stack height regulations.

(i) Incorporation by reference. (A) Sections 3(r), 3(s), 3(t), 3(u), 3(v), 3(w), 3(x), 3(y), 5(f), and 5(g) of the Arkansas Plan of Implementation for Air Pollution Control as adopted by the Arkansas Commission on Pollution Control and Ecology on May 22, 1987.

(ii) Additional material. None.

(27) Revisions to the Arkansas State Implementation Plan for (1) the National Ambient Air Quality Standards and particulate matter definitions (subsections (z) through (ff) of “Section 3. Definitions”). (2) Prevention of Significant Deterioration of Air Quality and its Supplement, and (3) subsection f(ix) of “Section 4. Permits”, as adopted on March 25, 1988, by the Arkansas Commission on Pollution Control and Ecology, were submitted by the Governor on June 3, 1988.

(i) Incorporation by reference. (A) Regulations of the Arkansas Plan of Implementation for Air Pollution Control “Section 3. Definitions”, subsections (z) through (ff), as promulgated on March 25, 1988.

(B) Prevention of Significant Deterioration Supplement Arkansas Plan of Implementation For Air Pollution Control, as amended on March 25, 1988.

(C) Regulations of the Arkansas Plan for Implementation for Air Pollution Control “Section 4. Permits”, subsection f(ix), as promulgated on March 25, 1988.

(ii) Other material. None.

(28) Revisions to the Arkansas State Implementation Plan for Prevention of Significant Deterioration (PSD) of Air Quality Supplement Arkansas Plan of Implementation for Air Pollution Control (PSD nitrogen dioxide increments), as adopted on May 25, 1990, by the Arkansas Commission on Pollution Control and Ecology, were submitted by the Governor on June 19, 1990.

(i) Incorporation by reference. (A) Prevention of Significant Deterioration Supplement Arkansas Plan of Implementation For Air Pollution Control as amended on May 25, 1990.

(ii) Additional material. None.

(29)-(30) [Reserved]

(31) The State is required to implement a Small Business Stationary Source Technical and Environmental Compliance Assistance Program (PROGRAM) as specified in the plan revision submitted by the Governor on November 6, 1992. This plan submittal, as adopted by the Arkansas Commission on Pollution Control and Ecology on November 5, 1992, was developed in accordance with section 507 of the Clean Air Act. On April 23, 1993, the Governor submitted Act 251 of 1993 which establishes the Compliance Advisory Panel (CAP) for the PROGRAM.

(i) Incorporation by reference. (A) Act 251 of 1993 approved by the Governor on February 26, 1993. Included in this Act are provisions creating a CAP, establishing membership of the CAP, and addressing the responsibilities and duties of the CAP.

(B) Arkansas Department of Pollution Control and Ecology, Minute Order No. 92-81, adopted November 5, 1992.

(ii) Additional material. (A) Revision entitled, “Arkansas Small Business Stationary Source Technical and Environmental Compliance Assistance Program SIP Revision”, adopted November 5, 1992.

(B) Legal opinion letter dated November 5, 1992, from Steve Weaver, Chief Counsel, Arkansas Department of Pollution Control and Ecology, regarding legality of Commission teleconference meeting.

[37 FR 10850, May 31, 1972. Redesignated at 63 FR 56827, Oct. 23, 1998]