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
Universal Citation: 326 IN Admin Code 4.1-14
Current through March 20, 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.
(b) NIPSCO Dean H. Mitchell Generating Station shall comply with the following:
(1) The diameter of the stack serving Boilers
6 and 11 shall be restricted to eight and three-tenths (8.3) feet.
(2) Beginning May 31, 1992, NIPSCO Dean H.
Mitchell Generating Station shall maintain and operate CEMS in the stacks
serving Boilers 4, 5, 6, and 11. The CEMS shall be operated in accordance with
the procedures specified in 326 IAC 3-4 and 326 IAC 3-5, with the exception of
the three (3) hour block period reporting requirements under 326 IAC 3-5-7.
Records of daily average emissions data shall be:
(A) maintained for a minimum of five (5)
years; and
(B) made available to
the department and U.S. EPA upon request.
(3) NIPSCO Dean H. Mitchell Generating
Station shall submit a written report to the department within thirty (30) days
after the end of each calendar quarter. The report shall contain the daily
weighted average emission rate in units of pounds per MMBtu as measured by the
CEMS for each stack venting emissions from those boilers specified in
subdivision (2). The hourly gross megawatt power production from the units
connected to each stack may be used as the weighting factor in determining the
daily weighted average. Records of the hourly gross megawatt power production
shall be:
(A) maintained for a minimum of five
(5) years; and
(B) made available
to the department and U.S. EPA upon request.
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