**Q743. My site has a gas collection system that did not operate at all during the reporting year, but did operate in prior reporting years. Which equations should I use to calculate my methane generation and GHG emissions for the current reporting year?**

**A743.** If the gas collection system was operational in prior reporting years and may be operational again in future reporting years, you should still indicate that your facility has a gas collection system and calculate and report the results of equations HH-1, HH-4, HH-5, and HH-6. Equation HH-4 should yield a value of 0 for R since the volume of recovered gas is 0. In equation HH-6, the value of G_{CH4} will equal the modeled methane generation rate in the reporting year calculated using equation HH-1; values of DE and f_{DEST} should be reported as 0. Equation HH-6 will be equivalent to the value of equation HH-5. No values should be reported for equations HH-7 and HH-8 because it is not possible to calculate values for these equations if the gas collection system did not operate at all during the reporting year (i.e., R=0). Finally, the value of equation HH-6 must be reported as the total subpart HH emission amount for your facility.

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