NR 440.20(3)(a)2.2. One percent of the potential combustion concentration (99% reduction) when combusting solid fuel; and NR 440.20(3)(a)3.3. 30% of potential combustion concentration (70% reduction) when combusting liquid fuel. NR 440.20(3)(b)(b) On and after the date the particulate matter performance test required to be conducted under s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any affected facility any gases which exhibit greater than 20% opacity (6-minute average), except for one 6-minute period per hour of not more than 27% opacity. NR 440.20(4)(a)(a) On and after the date on which the initial performance test required to be conducted under s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any affected facility which combusts solid fuel or solid-derived fuel, except as provided under par. (c), (d), (f) or (h), any gases which contain sulfur dioxide in excess of: NR 440.20(4)(a)1.1. 520 ng/J (1.20 lb/million Btu) heat input and 10% of the potential combustion concentration (90% reduction), or NR 440.20(4)(a)2.2. 30% of the potential combustion concentration (70% reduction), when emissions are less than 260 ng/J (0.60 lb/million Btu) heat input. NR 440.20(4)(b)(b) On and after the date on which the initial performance test required to be conducted under s. NR 440.08 is completed, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any affected facility which combusts liquid or gaseous fuels (except for liquid or gaseous fuels derived from solid fuels and as provided under par. (h)), any gases which contain sulfur dioxide in excess of: NR 440.20(4)(b)1.1. 340 ng/J (0.80 lb/million Btu) heat input and 10% of the potential combustion concentration (90% reduction), or NR 440.20(4)(b)2.2. 100% of the potential combustion concentration (zero percent reduction) when emissions are less than 86 ng/J (0.20 lb/million Btu) heat input. NR 440.20(4)(c)(c) On and after the date on which the initial performance test required to be conducted under s. NR 440.08 is complete, no owner or operator subject to the provisions of this section may cause to be discharged into the atmosphere from any affected facility which combusts solid solvent refined coal (SRC-I) any gases which contain sulfur dioxide in excess of 520 ng/J (1.20 lb/million Btu) heat input and 15% of the potential combustion concentration (85% reduction) except as provided under par. (f); compliance with the emission limitation is determined on a 30-day rolling average basis and compliance with the percent reduction requirement is determined on a 24-hour basis. NR 440.20(4)(d)(d) Sulfur dioxide emissions shall be limited to no more than 520 ng/J (1.20 lb/million Btu) heat input from any affected facility which: NR 440.20(4)(f)(f) The emission reduction requirements under this subsection do not apply to any affected facility that is operated under an SO2 commercial demonstration permit issued by the administrator in accordance with the provisions of 40 CFR 60.47Da. NR 440.20(4)(g)(g) Compliance with the emission limitation and percent reduction requirements under this subsection are both determined on a 30-day rolling average basis except as provided under par. (c). NR 440.20(4)(h)(h) When different fuels are combusted simultaneously, the applicable standard is determined by proration using the following formula: NR 440.20(4)(h)1.1. If emissions of sulfur dioxide to the atmosphere are greater than 260 ng/J (0.60 lb/million Btu) heat input: Es = [340 x + 520 y]/100
and
%Ps = 10
NR 440.20(4)(h)2.2. If emissions of sulfur dioxide to the atmosphere are equal to or less than 260 ng/J (0.60 lb/million Btu) heat input: Es = [340 x + 520 y]/100
and
%Ps = [10 x + 30 y]/100
where:
Es is the prorated sulfur dioxide emission limit (ng/J heat input)
%Ps is the percentage of potential sulfur dioxide emission allowed
x is the percentage of total heat input derived from the combustion of liquid or gaseous fuels, excluding solid-derived fuels