where:
Pallowable is the mass of NOx or SO2 emissions allowed for the compliance year
HIi is the amount of fuel, in mmBtu combusted each hour i, during the compliance year
h is the number of hours fuel is combusted during the compliance year
ELp is the applicable emission limitation of s. NR 446.14 (1) for NOx or SO2 where:
Unit Averaging Pallowable is the mass of mercury, NOx, or SO2 emissions allowed for each pollutant determined in par. (a) for each EGU participating in emissions averaging during the compliance year
Pu is the lowest annual allowable mass of mercury, NOx or SO2 emissions allowed for the compliance year for each EGU as determined under par. (a) or applicable under any other enforceable state or federal requirement for each EGU participating in emissions averaging during the compliance year
n is the number of EGUs participating in emissions averaging
NR 446.18 HistoryHistory: CR 07-036: cr. Register November 2008 No. 635, eff. 12-1-08. NR 446.185(1)(a)(a) Owners and operators of a coal-fired EGU affected by this subchapter may use baseline mercury emissions approved by the department as an alternative to procedures in s. NR 446.18 (5) (a) in determining annual allowable mercury emissions. NR 446.185(1)(b)(b) Baseline mercury emissions shall be determined and used for calculating annual allowable mercury emissions for 5-year periods beginning with the period of 2016 to 2020. Baseline mercury emissions shall be determined every 5 years and used to calculate annual allowable mercury emissions for the subsequent 5-year period. NR 446.185(1)(c)(c) Baseline mercury emissions for each 5-year period shall be determined using fuel mercury content data measured for the calendar year which is 2 years prior to the first year of the applicable 5-year period. The year designated for measuring fuel mercury content is the baseline determination year. NR 446.185 NoteNote: Baseline emissions are measured for 2013 for determining the annual allowable emissions for compliance years 2015 to 2019, measured for 2018 for determining allowable emissions for compliance years 2020 through 2024, etc.
NR 446.185(1)(d)(d) No later than May 1 of the calendar year after the baseline determination year, the owner or operator of a coal-fired EGU shall submit a report to the department that includes information necessary to determine the baseline mercury emissions for that 5-year period. NR 446.185(1)(e)(e) In the report required under par. (d), the owners or operators of a coal-fired EGU may request alternative data be used for determining baseline emissions if the data for the specified year is not representative of the EGU’s normal operations or maintenance schedule. NR 446.185(1)(f)(f) Baseline mercury emissions for each EGU shall be determined according to the following procedures: NR 446.185(1)(f)1.1. Measure and determine the fuel mercury content according to requirements of s. NR 446.18 (3) for all fuels combusted in the EGU for the baseline determination year. NR 446.185(1)(f)2.2. Calculate the baseline mercury concentration, on a mmBtu-basis, for the baseline determination year according to Equation 11. where:
BMC is the average baseline mercury concentration of fuel, in pounds per mmBtu, contained in the fuels combusted in the EGU during the baseline determination year
Fuel Hgannual is the total mass of mercury contained in the fuel determined in subd. 1.
HIi is the total amount of fuel, in mmBtu, consumed each hour i, during the baseline determination year
h is the total number of hours fuel is consumed during the baseline determination year
NR 446.185(1)(f)3.3. Calculate the baseline mercury emissions according to Equation 12 as the baseline mercury concentration times the 3-year average of annual fuel consumption, in mmBtu, for the baseline determination year and 2 years prior to the baseline determination year. where:
BME is the baseline mercury emissions for the EGU in pounds
BMC is the baseline mercury concentration for the EGU determined in subd. 2., in pounds per mmBtu.
HIi is the amount of fuel, in mmBtu combusted in the EGU for each hour i during each year y
h is the total number of hours fuel is combusted in the EGU during each year
NR 446.185(1)(g)(g) When determining annual allowable mercury emissions for achieving compliance on a unit-by-unit basis, use one of the following equations as applicable: where:
Hgallowable is the mass of mercury emissions allowed for the EGU for the compliance year
BME is the baseline emissions for the EGU as determined in par. (f) 3.
Hg CE is the applicable requirement for percent mercury emission reduction divided by 100.
where:
Hgallowable is the mass of mercury emissions allowed for the compliance year
GEOGWh is the annual gross energy output of the EGU, in GWh, as determined in s. NR 446.18 (4) for the compliance year BMC is the baseline mercury concentration determined in par. (f) 2. for the EGU in pounds per mmBtu
Hg CE is the applicable requirement for percent mercury control removal divided by 100
HIi is the amount of fuel, in mmBtu combusted each hour i, in the baseline determination year
h is the total number of hours fuel is combusted during the calendar year designated for measuring baseline emissions data under par. (c)
EGWh is the annual gross electric output, in GWh, for the baseline determination year calculated according to s. NR 446.18 (4) (a) NR 446.185(2)(a)(a) The owner or operator of a coal-fired EGU may demonstrate compliance with the SO2 emission limitation in s. NR 446.14 (1) by demonstrating a minimum SO2 control efficiency equal to or greater than 90% removal of sulfur from fuels combusted in the EGU each year, excluding startup and shutdown, using a method approved by the department. NR 446.185(2)(b)(b) If electing to demonstrate compliance according to par. (a), the owners or operators of a coal-fired EGU shall submit an SO2 compliance demonstration procedure for department approval no later than October 1, 2013. The compliance procedure shall include test methods to determine sulfur removal from fuel and operating and parametric monitoring procedures to ensure continuous operation of control equipment consistent with maintaining the required control efficiency. NR 446.185(3)(3) Alternative methods and procedures. The owner or operator of a coal-fired EGU may use methods and procedures in determining annual allowable emissions as approved by the department to account for any of the following: NR 446.185(3)(a)(a) The contribution to mercury emissions by non-fuel materials inherent to pollution control processes. The contribution to the annual allowable emissions may not exceed the amount calculated when substituting annual mercury content of non-fuel materials for annual fuel mercury content in Equation 7 in s. NR 446.18 (5) (a) 1. NR 446.185(3)(b)(b) When monitoring or implementing control equipment for a stack serving multiple EGUs. NR 446.185 HistoryHistory: CR 07-036: cr. Register November 2008 No. 635, eff. 12-1-08; correction in (3) made under s. 13.92 (4) (b) 1., Stats., Register November 2008 No. 635; CR 13-089: am. (1) (b) Register July 2014 No. 703, eff. 8-1-14. NR 446.19(1)(1) The department shall report to the natural resources board by August 31, 2013. This report shall include: NR 446.19(1)(a)(a) An evaluation of the scientific and technology developments in relation to the control or reduction of mercury emissions. NR 446.19(1)(b)(b) An evaluation of whether the mercury requirements in this subchapter are achievable, given the scientific and technological developments. NR 446.19(1)(c)(c) Recommendations for revisions to this subchapter or other actions including additional compliance flexibility to achieve the mercury emission reduction requirement in s. NR 446.14 (1) (c) 3., given the scientific and technological developments. NR 446.19(2)(2) In addition to the report required under sub. (1), the department shall report to the natural resources board within 6 months of the date of promulgation of a federal regulation under section 111 or 112 of the Act (42 USC 7411 or 7412) or the enactment of a federal law that has mercury reduction requirements for the mercury emission sources affected by this subchapter. The report shall include a comparison of the federal requirements and the requirements of this subchapter along with recommendations for revisions to this subchapter or other actions. NR 446.19(3)(3) The natural resources board shall review these reports and, if they include recommendations for rule revisions or other actions, determine whether the department should proceed with actions based on the recommendations. NR 446.19 HistoryHistory: CR 07-036: cr. Register November 2008 No. 635, eff. 12-1-08. NR 446.20NR 446.20 Mercury emission limits. No person may cause, allow or permit emissions of mercury: NR 446.20(1)(1) In quantities greater than 2.3 kg (5.1 lbs) per 24-hour period from mercury cell chlor-alkali plants, or mercury ore processing facilities. NR 446.20(2)(2) In quantities greater than 3.2 kg (7.1 lbs) per 24-hour period from sludge incineration plants, sludge drying plants, or a combination of these that process wastewater treatment plant sludges. NR 446.20 HistoryHistory: Renum. from NR 154.19 (3) (a), Register, September, 1986, No. 369, eff. 10-1-86; am. (intro.), Register, May, 1992, No. 437, eff. 6-1-92; am. (2), Register, May, 1994, No. 461, eff. 6-1-94; CR 01-081: (1) and (2) renum. from NR 446.03 (2) and (3) Register September 2004 No. 585, eff. 10-1-04; CR 07-036: renum. from NR 446.14, am. (1) and (2) Register November 2008 No. 635, eff. 12-1-08. NR 446.21(1)(a)(a) Unless a waiver of emission testing is requested and obtained from the department, each owner or operator of a facility processing mercury ore on which construction or modification commenced after February 1, 1984 shall test emissions from the source in accordance with Method 101 within 90 days after startup. NR 446.21(1)(b)(b) The department shall be notified at least 30 days prior to a stack or performance test to afford it the opportunity to have a representative present to witness the testing procedures. The notice shall include a test plan in accordance with s. NR 439.07. NR 446.21(1)(c)(c) Samples shall be taken over such a period as is necessary to accurately determine the maximum emissions which will occur in a 24-hour period. No changes in the operation may be made which would potentially increase emissions above that determined by the most recent source test until the new emission level has been estimated by calculation and the results reported to the department. NR 446.21(1)(d)(d) All samples shall be analyzed, and mercury emissions shall be determined within 30 days after the source test. Each determination shall be reported to the department by registered letter dispatched before the close of the next business day following the determination. NR 446.21(1)(e)(e) Records of emission test results and other data needed to determine total emissions shall be retained at the source and made available for inspection by a department representative for a minimum of 2 years. NR 446.21(2)(2) Mercury chlor-alkali plants—hydrogen and end box ventilation gas streams. NR 446.21(2)(a)(a) Unless a waiver of emission testing is requested and obtained from the department, each owner or operator of a mercury chlor-alkali cell on which construction or modification commenced after February 1, 1984 shall test emissions from hydrogen streams in accordance with Method 102 and from end-box gas streams in accordance with Method 101 within 90 days after startup. NR 446.21(2)(b)(b) The department shall be notified at least 30 days in advance of stack or performance tests to afford it the opportunity to have a representative present to witness the testing procedures. The notice shall include a test plan in accordance with s. NR 439.07. NR 446.21(2)(c)(c) Samples shall be taken over such a period as is necessary to accurately determine the maximum emissions which will occur in a 24-hour period. No changes in the operation may be made which would potentially increase emissions above that determined by the most recent source test until the new emission level has been estimated by calculation and the results reported to the department. NR 446.21(2)(d)(d) All samples shall be analyzed, and mercury emissions shall be determined within 30 days after the source test. All determinations shall be reported to the department by registered letter dispatched before the close of the next business day following the determination. NR 446.21(2)(e)(e) Records of emissions test results and other data needed to determine total emissions shall be retained at the source and made available for inspection by a department representative for a minimum of 2 years. NR 446.21(3)(3) Mercury chlor-alkali plants—cell room ventilation system. NR 446.21(3)(a)(a) Stationary sources using mercury chlor-alkali cells may test cell room emissions in accordance with par. (b), or demonstrate compliance with par. (d) and assume ventilation emissions of 1.3 kg (2.9 lbs) per day of mercury. NR 446.21(3)(b)(b) Unless a waiver of emission testing is requested and obtained from the department, each owner or operator of a new or modified chlor-alkali plant shall pass all cell room air in forced gas streams through stacks suitable for testing and shall test emissions from the cell room in accordance with Method 101 within 90 days after startup.
