Section 446.07. Procedures for determining baseline mercury emissions for major utilities.

  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 2 nd 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 40 CFR part 75 , 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.

CR 01-081 : cr. September 2004 No. 585, eff. 10-1-04; CR 07-036 : renum. from NR 446.04, am. (intro.) Register November 2008 No. 635 , eff. 12-1-08.