South Dakota Administrative Rules › Title 74 - Department of Environment And Natural Resources › Article 74:36 - Air pollution control program › Chapter 74:36:21 - Regional haze program › Section 74:36:21:02 - Definitions

Current through Register Vol. 51, page 10, July 15, 2024
Unless otherwise specified, the terms used in this chapter
	 mean:
(1) "Adverse impact on
  visibility," visibility impairment that interferes with the management,
  protection, preservation, or enjoyment of the visitor's visual experience of
  the mandatory Class I federal area. Adverse impact on visibility shall be based
  on a case-by-case basis taking into account the geographic extent, intensity,
  duration, frequency, and time of visibility impairment, and how these factors
  correlate with times of visitor use of a mandatory Class I federal area and the
  frequency and timing of natural conditions that reduce visibility;
(2) "BART," best available retrofit
  technology;
(3) "Best available
  retrofit technology" an emission limitation based on the degree of reduction
  achievable through the application of the best system of continuous emission
  reduction for each pollutant that is emitted by an existing stationary
  facility. The emission limitation must be established, on a case-by-case basis,
  taking into consideration the technology available, the costs of compliance,
  the energy and nonair quality environmental impacts of compliance, any
  pollution control equipment in use or in existence at the source, the remaining
  useful life of the source, and the degree of improvement in visibility that may
  reasonable be anticipated to result from the use of such technology;
(4) "BART-eligible source," an existing
  stationary facility;
(5)
  "Coal-fired power plant," any person, corporation, limited liability company,
  association, company, partnership, political subdivision, municipality, rural
  electric cooperative, consumers power district, or any group or combination
  acting as a unit, owning or holding under lease, or otherwise real property
  used, or intended for use, for the conversion of coal into electric
  power;
(6) "Contribute to adverse
  impact on visibility," a change in visibility impairment in a mandatory Class I
  federal area of five-tenths deciviews or more, based on a 24-hour average,
  above the average natural visibility baseline. A source exceeds the threshold
  if the 98th percentile (eighth highest value) of the
  modeling results, based on one year of the three years of meteorological data
  modeled, equals or exceeds five-tenths deciviews;
(7) "Major source," as defined in §
									74:36:01:08(2)
  and (3);
(8) "Mandatory Class I
  federal area," any area identified in 40 C.F.R. § 81, Subpart D (July 1,
  2018);
(9) "Visibility impairment,"
  any human perceptible change in visibility such as light extinction, visual
  range, contrast, coloration, from that which would have existed under natural
  conditions;
(10) "30-day rolling
  average," expressed as pounds per million Btus and pounds per hour and
  calculated in accordance with the following procedures:
(a) Sum the total pounds of pollutant in
  question emitted from a unit during an operating day and the previous 29
  operating days;
(b) Sum the total
  heat input to the unit in million Btus during the operating day and the
  previous 29 operating days;
(c) Sum
  the total hours the unit operated in hours during the day and the previous 29
  operating days;
(d) For pounds per
  million Btus, divide the total number of pounds of the pollutant emitted during
  the 30-day operating days by the total heat input during the 30-day operating
  days;
(e) For pounds per hour,
  divide the total number of pounds of the pollutant emitted during the 30-day
  operating days by the total hours operated during the 30-day operating days.
A new 30-day rolling average shall be calculated for each new operating
	 day. Each 30-day rolling average shall represent all emissions, including
	 emissions that occur during periods of startup, shut down, and malfunction;
	 and