Indiana Administrative Code › Title 326 - AIR POLLUTION CONTROL DIVISION › Article 7 - SULFUR DIOXIDE RULES › Rule 4.1 - Lake County Sulfur Dioxide Emission Limitations › Section 4.1-14 - NIPSCO Dean H. Mitchell Generating Station sulfur dioxide emission limitations

Current through July 10, 2024
Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11
Affected: IC 13-15; IC 13-17
Sec. 14.
(a) NIPSCO
				Dean H. Mitchell Generating Station, Source Identification Number 00117, shall
				comply with the sulfur dioxide emission limits for Boilers 4, 5, 6, and 11 in
				pounds per million British thermal units (MMBtu), pounds per hour, and other
				requirements as follows:
(1) Operation under
				either subdivision (2)(B) or (2) (C) shall only be allowed provided that a
				nozzle is in the stack serving Boilers 4 and 5 such that the stack diameter is
				restricted to eight and three-tenths (8.3) feet.
(2) Sulfur dioxide emissions for boilers
				operating under the scenarios listed in this subdivision shall be measured as a
				daily weighted average by the continuous emissions monitoring systems (CEMS)
				required in subsection (b)(2). NIPSCO Dean H. Mitchell Generating Station may
				operate under any one (1) of the following scenarios:
(A) Boilers 4, 5, 6, and 11 may operate
				simultaneously under the following conditions:
(i) One (1) of Boiler 4 or 5 may operate on
				coal if the other boiler is operated on natural gas or is not operating. Sulfur
				dioxide emissions from the stack serving Boilers 4 and 5 shall be limited to
				one and five-hundredths (1.05) pounds per MMBtu and one thousand three hundred
				thirteen (1,313.0) pounds per hour.
(ii) Boilers 6 and 11 may operate
				simultaneously on coal. Sulfur dioxide emissions from the stack serving Boilers
				6 and 11 shall be limited to one and five-hundredths (1.05) pound per MMBtu and
				two thousand four hundred seventy-five (2,475.0) pounds per hour.
(B) Boilers 4, 5, 6, and 11 may
				operate simultaneously on coal subject to the following conditions:
(i) Sulfur dioxide emissions from the stack
				serving Boilers 4 and 5 shall be limited to seventy-seven hundredths (0.77)
				pound per MMBtu and one thousand nine hundred twenty-five (1,925.0) pounds per
				hour.
(ii) Sulfur dioxide emissions
				from the stack serving Boilers 6 and 11 shall be limited to seventy-seven
				hundredths (0.77) pound per MMBtu and one thousand eight hundred fifteen
				(1,815.0) pounds per hour.
(C) One (1) set of either Boilers 4 and 5 or
				6 and 11 may operate on coal if the other set is not operating, subject to the
				following conditions:
(i) Sulfur dioxide
				emissions from the stack serving Boilers 4 and 5 shall be limited to one and
				five-hundredths (1.05) pounds per MMBtu and two thousand six hundred
				twenty-five (2,625.0) pounds per hour.
(ii) Sulfur dioxide emissions from the stack
				serving Boilers 6 and 11 shall be limited to one and five-hundredths (1.05)
				pounds per MMBtu and two thousand four hundred seventy-five (2,475.0) pounds
				per hour.
(3)
				NIPSCO Dean H. Mitchell Generating Station shall maintain a daily log of the
				following for Boilers 4, 5, 6, and 11:
(A)
				Fuel type.
(B) Transition time of
				changes between or within operating scenarios.
The log shall be maintained for a minimum of five (5) years
				  and shall be made available to the department and U.S. EPA upon request.
(4) Emission limits
				shall be maintained during transition periods within or between operating
				scenarios.