NR 440.50(5)(j)1.b.b. If the owner or operator elects to take an emission allowance for fuel bound nitrogen, then excess emissions and periods of monitor downtime are as described in subd. 1. b. 1) and 2).
1) An excess emission shall be the period of time during which the fuel-bound nitrogen (N) is greater than the value measured during the performance test required in s. NR 440.08 and used to determine the allowance. The excess emission begins on the date and hour of the sample which shows that N is greater than the performance test value, and ends with the date and hour of a subsequent sample which shows a fuel nitrogen content less than or equal to the performance test value.
2) A period of monitor downtime begins when a required sample is not taken by its due date. A period of monitor downtime also begins on the date and hour that a required sample is taken, if invalid results are obtained. The period of monitor downtime ends on the date and hour of the next valid sample.
NR 440.50(5)(j)1.c.c. For turbines using NOx and diluent CEMS:
1) An hour of excess emissions shall be any unit operating hour in which the 4-hour rolling average NOx concentration exceeds the applicable emission limit in sub. (3) (a) 1. or 2. For the purposes of this section, a “4-hour rolling average NOx concentration” is the arithmetic average of the average NOx concentration measured by the CEMS for a given hour (corrected to 15% O2 and, if required under sub. (6) (c) 1., to ISO standard conditions) and the 3 unit operating hour average NOx concentrations immediately preceding that unit operating hour.
2) A period of monitor downtime shall be any unit operating hour in which sufficient data are not obtained to validate the hour, for either NOx concentration or diluent, or both.
3) Each report shall include the ambient conditions (temperature, pressure and humidity) at the time of the excess emission period and, if the owner or operator has claimed an emission allowance for fuel bound nitrogen, the nitrogen content of the fuel during the period of excess emissions. You do not have to report ambient conditions if you opt to use the worst case ISO correction factor as specified in par. (b) 3. b., or if you are not using the ISO correction equation under the provisions of sub. (6) (c) 1.
NR 440.50(5)(j)1.d.d. For owners or operator that elect, under par. (f), to monitor combustion parameters or parameters that document proper operation of the NOx emission controls:
1) An excess emission shall be a 4-hour rolling unit operating hour average in which any monitored parameter does not achieve the target value or is outside the acceptable range defined in the parameter monitoring plan for the unit.
2) A period of monitor downtime shall be a unit operating hour in which any of the required parametric data are either not recorded or are invalid.
NR 440.50(5)(j)2.2. ’Sulfur dioxide.’ If the owner or operator is required to monitor the sulfur content of the fuel under par. (h):
NR 440.50(5)(j)2.a.a. For samples of gaseous fuel and for oil samples obtained using daily sampling, flow proportional sampling, or sampling from the unit’s storage tank, an excess emission occurs each unit operating hour included in the period beginning on the date and hour of any sample for which the sulfur content of the fuel being fired in the gas turbine exceeds 0.8 weight percent and ending on the date and hour that a subsequent sample is taken that demonstrates compliance with the sulfur limit.
NR 440.50(5)(j)2.b.b. If the option to sample each delivery of fuel oil has been selected, the owner or operator shall immediately switch to one of the other oil sampling options, that is, daily sampling, flow proportional sampling, or sampling from the unit’s storage tank, if the sulfur content of a delivery exceeds 0.8 weight percent. The owner or operator shall continue to use one of the other sampling options until all of the oil from the delivery has been combusted, and shall evaluate excess emissions according to par. (j) 2. a. When all of the fuel from the delivery has been burned, the owner or operator may resume using the as-delivered sampling option.
NR 440.50(5)(j)2.c.c. A period of monitor downtime begins when a required sample is not taken by its due date. A period of monitor downtime also begins on the date and hour of a required sample, if invalid results are obtained. The period of monitor downtime shall include only unit operating hours, and ends on the date and hour of the next valid sample.
NR 440.50(5)(j)3.3. ‘Ice fog.’ Each period during which an exemption provided in sub. (3) (f) is in effect shall be reported in writing to the department quarterly. For each period, the ambient conditions existing during the period, the date and time the air pollution control system was deactivated and the date and time the air pollution control system was reactivated shall be reported. All quarterly reports shall be postmarked by the 30th day following the end of each calendar quarter.
NR 440.50(5)(j)4.4. ‘Emergency fuel.’ Each period during which an exemption provided in sub. (3) (k) is in effect shall be included in the report required in s. NR 440.07 (3). For each period, the type, reasons, and duration of the firing of the emergency fuel shall be reported.
NR 440.50(5)(j)5.5. All reports required under s. NR 440.07 (3) shall be postmarked by the 30th day following the end of each calendar quarter.
NR 440.50(6)(6)Test methods and procedures.
NR 440.50(6)(a)(a) The owner or operator shall conduct the performance tests required in s. NR 440.08 using one of the following:
NR 440.50(6)(a)1.1. EPA Method 20.
NR 440.50(6)(a)2.2. ASTM D6522-00, incorporated by reference in s. NR 440.17 (2) (a) 70.
NR 440.50(6)(a)3.3. EPA Method 7E and either EPA Method 3 or 3A in 40 CFR part 60 Appendix A, incorporated by reference in s. NR 440.17 (1).
NR 440.50(6)(b)(b) The performance tests under par. (a) shall be conducted as follows:
NR 440.50(6)(b)1.1. Sampling traverse points are to be selected following Method 20 or Method 1 (non-particulate procedures) and sampled for equal time intervals. The sampling shall be performed with a traversing single-hole probe or, if feasible, with a stationary multi-hole probe that samples each of the points sequentially. Alternatively, a multi-hole probe designed and documented to sample equal volumes from each hole may be used to sample simultaneously at the required points.
NR 440.50(6)(b)2.2. Notwithstanding subd. 1., the owner or operator may test at fewer points than are specified in Method 1 or Method 20 if the following conditions are met:
NR 440.50(6)(b)2.a.a. You may perform a stratification test for NOx and diluent pursuant to the procedures specified in section 6.5.6.1 (a) to (e) in Appendix A of 40 CFR part 75, incorporated by reference in s. NR 440.17 (1).
NR 440.50(6)(b)2.b.b. Once the stratification sampling is completed, the owner or operator may use one of the following alternative sample point selection criteria for the performance test:
1) If each of the individual traverse point NOx concentrations, normalized to 15% O2, is within ± 10% of the mean normalized concentration for all traverse points, then you may use 3 points located either 16.7, 50.0 and 83.3% of the way across the stack or duct, or, for circular stacks or ducts greater than 2.4 meters (7.8 feet) in diameter, at 0.4, 1.2 and 2.0 meters from the wall. The 3 points shall be located along the measurement line that exhibited the highest average normalized NOx concentration during the stratification test.
2) If each of the individual traverse point NOx concentrations, normalized to 15% O2, is within ± 5% of the mean normalized concentration for all traverse points, then you may sample at a single point, located at least one meter from the stack wall or at the stack centroid.