40 CFR §60.4372a

1. (a)If you elect to demonstrate compliance with a SO2 emissions standard according to § 60.4333a(d)(3), you must maintain on-site records (such as a current, valid purchase contract, tariff sheet, or transportation contract) documenting that total sulfur content for the fuel combusted in your stationary combustion turbine at all times does not exceed the conditions specified in paragraph (b) through (e) of this section, as applicable to your stationary combustion turbine.
2. (b)If your stationary combustion turbine is subject to the SO2 emissions standard in § 60.4330a(a), then the fuel combusted must have a potential SO2 emissions rate of 26 ng/J (0.060 lb/MMBtu) heat input or less.
3. (c)If your stationary combustion turbine is subject to the SO2 emissions standard in § 60.4330a(b), then the total sulfur content of the gaseous fuel combusted must be 650 (mg/scm) (28 gr/100 scf).
4. (d)If your stationary combustion turbine is subject to the SO2 emissions standard in § 60.4330a(c) or (d), the total sulfur content of the fuel combusted must be:
   1. (1)For natural gas, 140 gr/100 scf or less.
   2. (2)For fuel oil, 0.40 weight percent (4,000 ppmw) or less.
   3. (3)For other fuels, potential SO2 emissions of 180 ng/J (0.42 lb/MMBtu) heat input or less.
5. (e)Representative fuel sampling data following the procedures specified in section 2.3.1.4 or 2.3.2.4 in appendix D to part 75 of this chapter documenting that the fuel meets the part 75 requirements to be considered either pipeline natural gas or natural gas. Your stationary combustion turbine may not cause to be discharged into the atmosphere any gases that contain SO2 in excess of:
   1. (1)110 ng SO2/J (0.90 lb SO2/MWh) gross energy output or 26 ng SO2/J (0.060 lb SO2/MMBtu) heat input; or
   2. (2)780 ng SO2/J (6.2 lb SO2/MWh) gross energy output or 180 ng SO2/J (0.42 lb SO2/MMBtu) heat input if your combustion turbine is in a noncontinental area.