Wisconsin Administrative Code
Department of Natural Resources
NR 400-499 - Environmental Protection - Air Pollution Control
Chapter NR 446 - Control Of Mercury Emissions
Subchapter I - General Provisions
Section NR 446.04 - Procedures for determining annual mercury emissions

Universal Citation: WI Admin Code ยง NR 446.04

Current through August 26, 2024

Except as provided in subchs. II, III and IV, beginning on January 1, 2005, the owner or operator of a major stationary source shall calculate annual mercury emissions using the procedures and methods in this section.

(1) STATIONARY SOURCE COMBUSTION UNIT.

(a) The owner or operator of a combustion unit at the source which is not subject to subchs. II, III and IV shall calculate annual mercury emissions using the procedures of this subsection for each emissions unit and shall provide all associated data to the department.

(b) The owner or operator shall determine the mass mercury content of each fuel by multiplying the mercury content of the fuel times the amount of the fuel consumed. The mercury content of the fuel shall be determined either through testing according to the procedures in ASTM D3684-01, incorporated by reference in s. NR 484.10(47m), or an equivalent method approved by the department, or from published data which lists the mercury content of the specific fuel.

(c)
1. Except as provided in subd. 2., the owner or operator shall calculate the removal efficiency of mercury by air pollution control equipment for each fuel used, except natural gas and fuel oil, based on source performance tests on the equipment conducted according to the following methods and procedures:
a. The source performance tests shall be conducted according to Method 101A in Appendix B of, incorporated by reference in s. NR 484.04(23); Method 29 in Appendix A of, incorporated by reference in s. NR 484.04(20m); Method 30A or 30B in Appendix A of, incorporated by reference in s. NR 484.04(20s) and (20t) respectively; or ASTM D6784-02, incorporated by reference in s. NR 484.10(55x).

b. A sample of the fuel burned during the test shall be analyzed for mercury content, using ASTM D3684-01, incorporated by reference in s. NR 484.10(47m), or an equivalent method approved by the department. During each of the 3 runs of the performance test, a separate sample of the fuel being burned during the run shall be collected and analyzed.

c. During the source performance testing, the consumption of fuel shall be monitored and recorded.

2. Instead of conducting a source performance test under subd. 1., information derived from performance testing of other combustion units which are similar in terms of the type of combustion unit, particulate control equipment, fuel characteristics, and operating parameters may be used if the performance test was conducted according to the procedures in subd. 1.

(d) The owner or operator shall determine the annual mercury emissions by subtracting the mass mercury removed by air pollution control equipment from the mass mercury in the fuel.

(e) Nothing in this section shall prohibit the department from requiring other methods of determining annual mercury emissions.

(f) The owner or operator of a combustion source subject to this subsection may request that the department approve alternative methods for determining annual mercury emissions

(2) STATIONARY SOURCE PROCESS UNIT. The owner or operator of a process unit at the source which is not subject to subch. II, III or IV shall calculate and report annual mercury emissions from the process unit using the procedures and methods of this subsection and shall provide all associated data to the department. The calculations shall apply a mass balance approach, emission test data, or both, as follows:

(a) A separate mass balance shall be used to calculate the mercury contained in each applicable process stream by accounting for:
1. All process streams including: process raw materials, products and by-products; and pollution control equipment and control by-products.

2. The mercury concentration and throughput rate for each process stream.

3. The annual mass mercury content input and output of each process stream.

(b) Mercury emission test data and emission factors obtained during source performance testing for any applicable process stream may also be used.

(c) The owner or operator of the process units subject to this subsection may request that the department approve alternative methods for determining annual mercury emissions.

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