NR 445.02(17) (17) “Unit risk factor” means the upper-bound excess lifetime cancer risk estimated to result from continuous exposure to a hazardous air contaminant concentration of 1 microgram per cubic meter in the air. A unit risk factor is expressed in units of cubic meters per microgram (m3/μg).

NR 445.02 Note Note: The interpretation of unit risk would be as follows: a unit risk factor = 1.5 x 10-6 m3/μg applied to a concentration of a hazardous air contaminant of 1 μg/m3 would result in an expectation of 1.5 excess tumors to develop per 1,000,000 people exposed daily for a lifetime.

NR 445.02(18) (18) “Virgin fossil fuel” means any solid, refined liquid or refined gaseous fossil fuel with a Btu content greater than 7,000 Btu/lb which is not blended with reprocessed or recycled fuels. Group 1 virgin fossil fuels consist of natural gas, liquid petroleum gas, distillate fuel oil, gasoline and diesel fuel. Group 2 virgin fossil fuels consist of coal and residual fuel oil.

NR 445.02 History History: Renum. from NR 154.01 (19), (28e) and (116e), cr. (intro.), Register, September, 1986, No. 369, eff. 10-1-86; renum. (1) to (3) to be (2), (3) and (9), cr. (1), (4) to (8), (10) and (11), Register, September, 1988, No. 393, eff. 10-1-88; (9m) renum. from NR 400.02 (77), Register, December, 1988, No. 396, eff. 1-1-89; am. (9m), Register, May, 1992, No. 437, eff. 6-1-92; r. and recr. (2), Register, October, 1992, No. 442, eff. 11-1-92; cr. (9g), Register, December, 1994, No. 468, eff. 1-1-95; am. (intro.), (2), (6) and (9m), Register, December, 1995, No. 480, eff. 1-1-96; am. (1), Register, January, 1997, No. 493, eff. 2-1-97; am. (intro.) and (1), Register, November, 1999, No. 527, eff. 12-1-99; CR 02-097: renum. (1), (2), (4) to (8), (9g), (10) and (11) to be NR 400.02 (27m), 447.02 (4) and 445.02 (1m), (4), (7) to (9), (14), (15) and (18), am. (1m), (7) and (9) (intro.) as renumbered, cr. (1) to (3), (5), (6), (10) to (13), (16) and (17) Register June 2004 No. 582, eff. 7-1-04; CR 07-076: am. (5) (a) (intro.) Register July 2008 No. 631, eff. 8-1-08; correction in (7) made under s. 13.92 (4) (b) 7., Stats., Register July 2008 No. 631.

NR 445.03 NR 445.03 General limitations. No person may cause, allow or permit emissions into the ambient air of any hazardous substance in a quantity or concentration or for a duration that is injurious to human health, plant or animal life unless the purpose of that emission is for the control of plant or animal life. Hazardous substances include but are not limited to the hazardous air contaminants listed in Tables A to C of s. NR 445.07.

NR 445.03 History History: Renum. from NR 154.19 (1), Register, September, 1986, No. 369, eff. 10-1-86; am. Register, September, 1988, No. 393, eff. 10-1-88; am., Register, November, 1999, No. 527, eff. 12-1-99; CR 02-097: am. Register June 2004 No. 582, eff. 7-1-04.

subch. II of ch. NR 445 Subchapter II — Emission Requirements, Review and Notifications for Stationary Sources of Hazardous Air Contaminants

NR 445.06 NR 445.06 Safe harbor.

NR 445.06(1) (1) An owner or operator of a facility shall be deemed to be in compliance with this subchapter and the requirements in chs. NR 406, 407 and 438 listed in this subsection for any hazardous air contaminant listed in Table A, B or C of s. NR 445.07 if the owner or operator identifies the contaminant through due diligence and determines that the emissions of the identified contaminant are below the applicable regulatory threshold in this chapter or otherwise exempt from regulation, or the facility is meeting the applicable provisions in this subchapter. The requirements from chs. NR 406, 407 and 438 are the following:

NR 445.06(1)(a) (a) Section NR 406.04 (2) (f) and (3) (a).

NR 445.06(1)(b) (b) Section NR 407.03 (2) (d).

NR 445.06(1)(c) (c) Section NR 407.05 (4) (c) 1., 9. and 10.

NR 445.06(1)(d) (d) Section NR 407.09 (1) (c) 1. b.

NR 445.06(1)(e) (e) Section NR 438.03 (1).

NR 445.06(2) (2) The owner or operator will not be deemed to be out of compliance with this subchapter or with the provisions identified in sub. (1) (a) to (e) for any hazardous air contaminant listed in Table A, B or C of s. NR 445.07 for the period of time prior to either of the determinations in par. (a) or (b) being made if the determination is submitted in writing to the department within 21 calendar days, and no later than 90 calendar days after the determination, the owner or operator certifies that the facility is in compliance with all applicable requirements for the hazardous air contaminant. The department may, in writing, extend the 90 calendar days for achieving compliance. The determinations are as follows:

NR 445.06(2)(a) (a) That a hazardous air contaminant that was not previously identified through due diligence is later determined to be emitted from the facility in an amount greater than the applicable emission threshold in any of the following:

NR 445.06(2)(a)1. 1. Table A, B or C of s. NR 445.07.

NR 445.06(2)(a)2. 2. Section NR 406.04 (2) (f) and (3) (a).

NR 445.06(2)(a)3. 3. Section NR 407.03 (2) (d).

NR 445.06(2)(a)4. 4. Table 2 of s. NR 407.05.

NR 445.06(2)(a)5. 5. Table 1 of s. NR 438.03.

NR 445.06(2)(b) (b) That a hazardous air contaminant previously identified and quantified is determined to be emitted in a greater amount, and that amount is greater than the applicable emission threshold for any of the provisions identified in par. (a) 1. to 5.

NR 445.06(3) (3) Notwithstanding sub. (2), the department retains the authority to order the owner or operator to achieve compliance with applicable requirements within a specific time period shorter than the 90 calendar days whenever compliance in the shorter period of time is feasible and necessary to protect public health and the environment.

NR 445.06 Note Note: The address for submittal of information and requests for an extension from the deadline in sub. (2) is:
  Wisconsin Department of Natural Resources
  Bureau of Air Management
  PO Box 7921
  Madison WI 53707-7921
  Attention: NR 445 Safe Harbor Determinations.

NR 445.06 History History: CR 02-097: cr. Register June 2004 No. 582, eff. 7-1-04; CR 05-055: am. (2) (a) 5. Register December 2005 No. 600, eff. 1-1-06.

NR 445.07 NR 445.07 Emission thresholds, standards, control requirements and exemptions.

NR 445.07(1) (1) All sources of hazardous air contaminants. Except as provided in sub. (5), the following requirements apply:

NR 445.07(1)(a) (a) No owner or operator of a source may cause, allow or permit emissions of a hazardous air contaminant listed in Table A in such quantity or concentration or for such duration as to cause an ambient air concentration of the contaminant off the source property that exceeds the concentration in column (g) of Table A for the contaminant.

NR 445.07 Note Note: Owners and operators of facilities emitting less than 3 tons of volatile organic compounds and 5 tons particulate matter on an annual basis, or who engage in limited or no manufacturing activities, should refer to s. NR 445.11 prior to determining applicable requirements under this section.