Q281. I don’t see landfill gas listed in Table C-1, is a there a default high heating value or emission factor I am required to use for landfill gas when calculating emissions for subpart C?

A281.  Landfill gas is considered a type of biogas listed in Table C-1. If Tier 1 is selected for landfill gas units, both the default high heating value and emission factor specified for biogas must be used. If the reporter would prefer to use their own HHV, they may opt to use the procedures of Tier 2. If Tier 2 is selected, the high heating value for biogas must be sampled quarterly. The reporter may not use reference values provided by other sources.