Wisconsin Administrative Code › Department of Natural Resources › NR 400-499 - Environmental Protection - Air Pollution Control › Chapter NR 446 - Control Of Mercury Emissions › Subchapter II - Control of Mercury Emissions from Major Utilities › Section NR 446.07 - Procedures for determining baseline mercury emissions for major utilities

Current through June 24, 2024
The owner or operator of a major utility shall calculate
					 baseline mercury emissions of the combustion units of the major utility using
					 the procedures of this section for each emissions unit and provide all
					 associated data to the department in the report required under s.
					 NR
					 446.06(1).
(1) No later than the first day of the 2nd
				  month beginning after October 1, 2004, and continuing for a calendar 12 month
				  period, a representative sample shall be collected weekly for each solid fossil
				  fuel used in the emissions unit in that week. Each weekly sample of a fuel
				  collected under this subsection shall be composited into a monthly sample that
				  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.
(2) The
				  mercury content of each non-solid fossil 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 fuel.
(3) The major
				  utility shall determine the monthly consumption of each fuel in million British
				  thermal units (mmBtu), using methods and procedures specified in Appendices A,
				  B, C and F of , incorporated by reference in s.
				  NR
				  484.04(26m) (a) to (d). The major
				  utility may apportion the fuel mmBtu to individual fuels for which the mercury
				  content is determined under sub. (1) or (2), using consumption and delivery
				  records for the fuels.
(4) The
				  information gathered in subs. (1) and (2) shall be multiplied by the
				  corresponding fuel consumption rates determined under sub. (3) to determine the
				  total annual mercury contained in each fuel.
(5) The mercury content for each fuel, on a
				  mmBtu-basis, shall be computed by dividing the results of sub. (4) by the
				  amount of each fuel burned, in mmBtus, during the 12 month sampling
				  period.
(6) The mercury emissions
				  for 2002, 2003 and the 12 months identified in sub. (1) shall be calculated by
				  multiplying the results of sub. (5) times the annual fuel consumption for each
				  of those years.
(7) The baseline
				  mercury emissions shall be the 3-year arithmetic average of the mercury
				  emissions determined under subs. (4) and (6) for 2002, 2003 and the 12 months
				  identified in sub. (1).
(8) The
				  major utility shall record and report the baseline determination data and
				  calculations for each combustion unit, including the type or types of fuel, the
				  monthly consumption of each fuel in mmBtus, and the mercury concentration in
				  each fuel.
(9) The owner or
				  operator of a major utility may request that alternative procedures for
				  determining baseline mercury emissions be approved by the department.