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(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)(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.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.
NR 440.50(6)(b)3.3. Other acceptable alternative reference methods and procedures are given in par. (d). NR 440.50(6)(c)(c) The owner or operator shall determine compliance with the applicable nitrogen oxides emission limitation in sub. (3) and shall meet the performance test requirements of s. NR 440.08 as follows: NR 440.50(6)(c)1.1. For each run of the performance test, the mean nitrogen oxides emission concentration (NOxo) corrected to 15% O2 shall be corrected to ISO standard conditions using the following equation. Notwithstanding this requirement, use of the ISO correction equation is optional for: lean premix stationary combustion turbines; units used in association with heat recovery steam generators (HRSG) equipped with duct burners; and units equipped with add-on emission control devices: where:
NOx is the emission concentration of NOx at 15% O2 and ISO standard ambient conditions, ppm by volume, dry basis
NOxo is the mean observed NOx concentration, ppm by volume, dry basis, at 15% O2
Pr is the reference combustor inlet absolute pressure at 101.3 kilopascals ambient pressure, mm Hg
Po is the observed combustor inlet absolute pressure at test, mm Hg
Ho is the observed humidity of ambient air, g H2O/g air
e is the transcendental constant, 2.718