NR 446.02(11)(11) “Sludge” means sludge produced by a treatment plant that processes municipal or industrial wastewater. NR 446.02(12)(12) “Sludge dryer” means a device used to reduce the moisture content of sludge by heating to temperatures above 65ºC (ca. 150ºF) directly with combustion gases. NR 446.02 HistoryHistory: Renum. from NR 154.01, Register, September, 1986, No. 369, eff. 10-1-86; am. (intro.) and (2), cr. (10m), Register, May, 1994, No. 461, eff. 6-1-94; am. (10m), Register, December, 1995, No. 480, eff. 1-1-96; CR 02-097: am. (intro.) Register June 2004 No. 582, eff. 7-1-04; CR 01-081: renum. (1) to be (1g), cr. (1), (1c, (1n), (1r), (1w), (6e), (6m), (6s), (8m) and (10s) Register September 2004 No. 585, eff. 10-1-04; CR 07-036: cr. (1e), r. (1w), am. (1c) Register November 2008 No. 635, eff. 12-1-08. NR 446.03(1)(1) No person may cause, allow or permit emissions of mercury in such quantity and duration as to cause the ambient air concentration to exceed 1 mg/m3, averaged over a 30-day period. NR 446.03(2)(a)(a) No person may commence construction or modification of a stationary source that results in an increase in annual allowable emissions of mercury of 10 pounds or more from the new or modified source unless the person has obtained a permit under ch. NR 406. The department may not issue a permit under ch. NR 406 for the source unless the department finds that emissions of mercury will be controlled to a level which is best available control technology. NR 446.03(2)(b)(b) New or modified stationary sources that are subject to an emission limit for mercury required under section 111 or 112 of the Act (42 USC 7411 and 7412 respectively) are exempt from the requirements of this section. NR 446.03(2)(c)(c) Except as provided in par. (b), this section applies to all new or modified sources for which an air permit application was submitted or should have been submitted to the department under par. (a) on or after the first day of the calendar month following October 1, 2004. NR 446.03 HistoryHistory: CR 01-081: renum. (intro.) and (1) from s. NR 446.03 and am. Register September 2004 No. 585, eff. 10-1-04; CR 07-036: cr. (title), sub. (1) and (2) renum. from NR 446.025 and NR 446.05, am. (2) (b) and (c) Register November 2008 No. 635, eff. 12-1-08. NR 446.04NR 446.04 Procedures for determining annual mercury emissions. 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. NR 446.04(1)(a)(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. NR 446.04(1)(b)(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. NR 446.04(1)(c)1.1. 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: NR 446.04(1)(c)1.b.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. NR 446.04(1)(c)1.c.c. During the source performance testing, the consumption of fuel shall be monitored and recorded. NR 446.04(1)(c)2.2. 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. NR 446.04(1)(d)(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. NR 446.04(1)(e)(e) Nothing in this section shall prohibit the department from requiring other methods of determining annual mercury emissions. NR 446.04(1)(f)(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 NR 446.04(2)(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: NR 446.04(2)(a)(a) A separate mass balance shall be used to calculate the mercury contained in each applicable process stream by accounting for: NR 446.04(2)(a)1.1. All process streams including: process raw materials, products and by-products; and pollution control equipment and control by-products. NR 446.04(2)(a)2.2. The mercury concentration and throughput rate for each process stream. NR 446.04(2)(a)3.3. The annual mass mercury content input and output of each process stream. NR 446.04(2)(b)(b) Mercury emission test data and emission factors obtained during source performance testing for any applicable process stream may also be used.