52.145—Visibility protection.
(a)
The requirements of section 169A of the Clean Air Act are not met, because the plan does not include approvable procedures for protection of visibility in mandatory Class I Federal areas.
(b)
Regulations for visibility monitoring and new source review. The provisions of §§ 52.26, 52.27 and 52.28, are hereby incorporated and made part of the applicable plan for the State of Arizona.
(c) Long-term strategy.
The provisions of § 52.29 are hereby incorporated and made part of the applicable plan for the State of Arizona.
(d)
This paragraph is applicable to the fossil fuel-fired, steam-generating equipment designated as Units 1, 2, and 3 at the Navajo Generating Station in the Northern Arizona Intrastate Air Quality Control Region ( § 81.270 of this chapter ).
Administrator means the Administrator of EPA or his/her designee.
Affected Unit(s) means the steam-generating unit(s) at the Navajo Generating Station, all of which are subject to the emission limitation in paragraph (d)(2) of this section, that has accumulated at least 365 boiler operating days since the passage of the date defined in paragraph (d)(6) of this section applicable to it.
Boiler Operating Day for each of the boiler units at the Navajo Generating Station is defined as a 24-hour calendar day (the period of time between 12:01 a.m. and 12:00 midnight in Page, Arizona) during which coal is combusted in that unit for the entire 24 hours.
Owner or Operator means the owner, participant in, or operator of the Navajo Generating Station to which this paragraph is applicable.
Unit-Week of Maintenance means a period of 7 days during which a fossil fuel-fired steam-generating unit is under repair, and no coal is combusted in the unit.
(2) Emission limitation.
No owner or operator shall discharge or cause the discharge of sulfur oxides into the atmosphere in excess of 42 ng/J [0.10 pound per million British thermal units (lb/MMBtu)] heat input.
(3) Compliance determination.
Until at least one unit qualifies as an affected unit, no compliance determination is appropriate. As each unit qualifies for treatment as an affected unit, it shall be included in the compliance determination. Compliance with this emission limit shall be determined daily on a plant-wide rolling annual basis as follows:
(i)
For each boiler operating day at each steam generating unit subject to the emission limitation in paragraph (d)(2) of this section, the owner or operator shall record the unit's hourly SO2 emissions using the data from the continuous emission monitoring systems, [required in paragraph (d)(4) of this section] and the daily electric energy generated by the unit (in megawatt-hours) as measured by the megawatt-hour meter for the unit.
(ii)
Compute the average daily SO2 emission rate in ng/J (lb/MMBtu) following the procedures set out in method 19, appendix A, 40 CFR part 60 in effect on October 3, 1991.
(iii)
For each boiler operating day for each affected unit, calculate the product of the daily SO2 emission rate (computed according to paragraph (d)(3)(ii) of this section) and the daily electric energy generated (recorded according to paragraph (d)(3)(i) of this section) for each unit.
(iv)
For each affected unit, identify the previous 365 boiler operating days to be used in the compliance determination. Except as provided in paragraphs (d)(9) and (d)(10) of this section, all of the immediately preceding 365 boiler operating days will be used for compliance determinations.
(v)
Sum, for all affected units, the products of the daily SO2 emission rate-electric energy generated (as calculated according to paragraph (d)(3)(iii) of this section) for the boiler operating days identified in paragraph (d)(3)(iv) of this section.
(vi)
Sum, for all affected units, the daily electric energy generated (recorded according to paragraph (d)(3)(i) of this section) for the boiler operating days identified in paragraph (d)(3)(iv) of this section.
(vii)
Calculate the weighted plant-wide annual average SO2 emission rate by dividing the sum of the products determined according to paragraph (d)(3)(v) of this section by the sum of the electric energy generated determined according to paragraph (d)(3)(vi) of this section.
(viii)
The weighted plant-wide annual average SO2 emission rate shall be used to determine compliance with the emission limitation in paragraph (d)(2) of this section.
(4) Continuous emission monitoring.
The owner or operator shall install, maintain, and operate continuous emission monitoring systems to determine compliance with the emission limitation in paragraph (d)(2) of this section as calculated in paragraph (d)(3) of this section. This equipment shall meet the specifications in appendix B of 40 CFR part 60 in effect on October 3, 1991. The owner or operator shall comply with the quality assurance procedures for continuous emission monitoring systems found in appendix F of 40 CFR part 60 in effect on October 3, 1991.
(5) Reporting requirements.
For each steam generating unit subject to the emission limitation in paragraph (d)(2) of this section, the owner or operator:
(i)
Shall furnish the Administrator written notification of the SO2, oxygen, and carbon dioxide emissions according to the procedures found in 40 CFR § 60.7 in effect on October 3, 1991.
(ii)
Shall furnish the Administrator written notification of the daily electric energy generated in megawatt-hours.
(iii)
Shall maintain records according to the procedures in 40 CFR 60.7 in effect on October 3, 1991.
(iv)
Shall notify the Administrator by telephone or in writing within one business day of any outage of the control system needed for compliance with the emission limitation in paragraph (d)(2) of this section and shall submit a follow-up written report within 30 days of the repairs stating how the repairs were accomplished and justifying the amount of time taken for the repairs.
(6) Compliance dates.
The requirements of this paragraph shall be applicable to one unit at the Navajo Generating Station beginning November 19, 1997, to two units beginning November 19, 1998, and to all units beginning on August 19, 1999.
(7) Schedule of compliance.
The owner or operator shall take the following actions by the dates specified:
(i)
By June 1, 1992, award binding contracts to an architectural and engineering firm to design and procure the control system needed for compliance with the emission limitation in paragraph (d)(2) of this section.
(ii)
By January 1, 1995, initiate on-site construction or installation of a control system for the first unit.
The interim deadlines will be extended if the owner or operators can demonstrate to the Administrator that compliance with the deadlines in paragraph (d)(6) of this section will not be affected.
(8) Reporting on compliance schedule.
Within 30 days after the specified date for each deadline in the schedule of compliance (paragraph (d)(7) of this section, the owner or operator shall notify the Administrator in writing whether the deadline was met. If it was not met the notice shall include an explanation why it was not met and the steps which shall be taken to ensure future deadlines will be met.
(9) Exclusion for equipment failure during initial operation.
For each unit, in determining compliance for the first year that such unit is required to meet the emission limitation in paragraph (d)(2) of this section, periods during which one of the following conditions are met shall be excluded:
(ii)
Field installation including engineering or construction precludes equipment or systems from performing as designed.
Code of Federal Regulations
(10) Exclusion for catastrophic failure.
In addition to the exclusion of periods allowed in paragraph (d)(9) of this section, any periods of emissions from an affected unit for which the Administrator finds that the control equipment or system for such unit is out of service because of catastrophic failure of the control system which occurred for reasons beyond the control of the owner or operators and could not have been prevented by good engineering practices will be excluded from the compliance determination. Events which are the consequence of lack of appropriate maintenance or of intentional or negligent conduct or omissions of the owner or operators or the control system design, construction, or operating contractors do not constitute catastrophic failure.
(11) Equipment operation.
The owner or operator shall optimally operate all equipment or systems needed to comply with the requirements of this paragraph consistent with good engineering practices to keep emissions at or below the emission limitation in paragraph (d)(2) of this section, and following outages of any control equipment or systems the control equipment or system will be returned to full operation as expeditiously as practicable.
(12) Maintenance scheduling.
On March 16 of each year starting in 1993, the owner or operator shall prepare and submit to the Administrator a long-term maintenance plan for the Navajo Generating Station which accommodates the maintenance requirements for the other generating facilities on the Navajo Generating Station grid covering the period from March 16 to March 15 of the next year and showing at least 6 unit-weeks of maintenance for the Navajo Generating Station during the November 1 to March 15 period, except as provided in paragraph (d)(13) of this section. This plan shall be developed consistent with the criteria established by the Western States Coordinating Council of the North American Electric Reliability Council to ensure an adequate reserve margin of electric generating capacity. At the time that a plan is transmitted to the Administrator, the owner or operator shall notify the Administrator in writing if less than the full scheduled unit-weeks of maintenance were conducted for the period covered by the previous plan and shall furnish a written report stating how that year qualified for one of the exceptions identified in paragraph (d)(13) of this section.
(13) Exceptions for maintenance scheduling.
The owner or operator shall conduct a full 6 unit-weeks of maintenance in accordance with the plan required in paragraph (d)(12) of this section unless the owner or operator can demonstrate to the satisfaction of the Administrator that a full 6 unit-weeks of maintenance during the November 1 to March 15 period should not be required because of the following:
(i)
There is no need for 6 unit-weeks of scheduled periodic maintenance in the year covered by the plan;
(ii)
The reserve margin on any electrical system served by the Navajo Generating Station would fall to an inadequate level, as defined by the criteria referred to in paragraph (d)(12) of this section.
(iii)
The cost of compliance with this requirement would be excessive. The cost of compliance would be excessive when the economic savings to the owner or operator of moving maintenance out of the November 1 to March 15 period exceeds $50,000 per unit-day of maintenance moved.
(iv)
A major forced outage at a unit occurs outside of the November 1 to March 15 period, and necessary periodic maintenance occurs during the period of forced outage.
If the Administrator determines that a full 6 unit-weeks of maintenance during the November 1 to March 15 period should not be required, the owner or operator shall nevertheless conduct that amount of scheduled maintenance that is not precluded by the Administrator. Generally, the owner or operator shall make best efforts to conduct as much scheduled maintenance as practicable during the November 1 to March 15 period.