(a) Upon promulgation of this regulation, no owner or operator of an existing stationary combustion installation which fires oil or oil in combination with other liquid or gaseous fuels shall be allowed to emit particulate matter in excess of 0.10 pound per million Btu heat input. Within four years of the promulgation of this regulation, no owner or operator of an existing stationary combustion installation firing solid fuel shall be allowed to emit particulate matter in excess of 0.10 pound per million Btu heat input. Upon the commencement of operation, no owner or operator of a new stationary combustion installation shall be allowed to emit particulate matter in excess of 0.10 pound per million Btu heat input. The above emission limits apply to stationary combustion installations with a maximum heat input capacity equal to or exceeding:

(b) When two or more stationary combustion installations are connected to a common air cleaning device and/or stack, the total heat input of all the connected emission sources shall be the heat input for the purpose of determining the applicability of subdivision (a) of this section, unless there is a limit in the facility's permit that prohibits operation of the connected emission sources below the specified heat inputs in subdivision (a) of this section.

(c) All stationary combustion installations subject to the requirements of this Subpart shall perform an annual tune-up of their equipment.