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 that would be emitted to the atmosphere.
Boiler-operating-day means any 24- hour period between 12:00 midnight and the following midnight during which any fuel is combusted at any time at the steam generating unit.
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 coal burning equipment designated as:
Regional Administrator means the Regional Administrator of EPA Region 6 or his/her authorized representative.
Unit means one of the coal fired boilers covered under paragraph (a) of this section.
SO2emission limit. The individual sulfur dioxide emission limit for a unit shall be 0.06 pounds per million British thermal units (lb/MMBtu) as averaged over a rolling 30 boiler-operating-day period. For each unit, SO2 emissions for each calendar 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 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 30 boiler-operating-day rolling average for SO2.
40 C.F.R. §52.1923