# 60.4415a How do I conduct performance tests to demonstrate compliance with my SO emissions standard?
(a) If you are an owner or operator of an affected facility complying with the fuel-based standard must submit fuel records (such as a current, valid purchase contract, tariff sheet, transportation contract, or results of a fuel analysis) to satisfy the requirements of § 60.8.
(b) If you are an owner or operator of an affected facility complying with the SO<sub>2</sub> emissions standard must conduct the performance test by measuring the SO<sub>2</sub> emissions in the stationary combustion turbine exhaust gases using the methods in either paragraph (b)(1) or (2) of this section.
(1) Measure the SO<sub>2</sub> concentration using EPA Method 6, 6C, or 8 in appendix A-4 to this part or EPA Method 20 in appendix A-7 to this part. For units complying with the output-based standard, concurrently measure the stack gas flow rate, using EPA Methods 1 and 2 in appendix A-1 to this part, and measure and record the electrical and thermal output from the unit. Then use equation 1 to this paragraph (b)(1) to calculate the SO<sub>2</sub> emissions rate:
****Equation 1 to Paragraph (b)(1)
Where:
E = SO<sub>2</sub> emissions rate, in lb/MWh;
1.664 × 10<sub>−7</sub> = Conversion constant, in lb/dscf-ppm;
(SO<sub>2</sub>)<sub>c</sub> = Average SO<sub>2</sub> concentration for the run, in ppm;
Q<sub>std</sub> = Average stack gas volumetric flow rate, in dscf/h; and
P = Average gross electrical and mechanical energy output of the stationary combustion turbine, in MW (for simple cycle operation), for combined cycle operation, the sum of all electrical and mechanical output from the combustion and steam turbines, or, for CHP operation, the sum of all electrical and mechanical output from the combustion and steam turbines plus all useful recovered thermal output not used for additional electric or mechanical generation or to enhance the performance of the stationary combustion turbine, in MW, calculated according to § 60.4350a(f)(2).
(2) Measure the SO<sub>2</sub> and diluent gas concentrations, using either EPA Method 6, 6C, or 8 in appendix A-4 to this part and EPA Method 3A in appendix A-2 to this part, or EPA Method 20 in appendix A-7 to this part. Concurrently measure the heat input to the unit, using a fuel flowmeter (or flowmeters), an O<sub>2</sub> or CO<sub>2</sub> CEMS along with a stack flow monitor, or the methodologies in appendix F to part 75 of this chapter, and for units complying with the output based standard measure the electrical and thermal output of the unit. Use EPA Method 19 in appendix A-7 to this part to calculate the SO<sub>2</sub> emissions rate in lb/MMBtu. Then, use equations 1 and, if necessary, 2, 3, and 4 in § 60.4374a to calculate the SO<sub>2</sub> emissions rate in lb/MWh.