Q350. What if I have more than one landfill or more than one cell at my facility, one is closed, one is open, and each has a different waste content?

A350. The definition of an MSW landfill in 40CFR98.6 states that a "Municipal solid waste landfill or MSW landfill means an entire disposal facility in a contiguous geographical space where household waste is placed in or on land. An MSW landfill may also receive other types of RCRA Subtitle D wastes (40 CFR 257.2) such as commercial solid waste, nonhazardous sludge, conditionally exempt small quantity generator waste, and industrial solid waste. Portions of an MSW landfill may be separated by access roads, public roadways, or other public right-of-ways. An MSW landfill may be publicly or privately owned."

Therefore, all areas in which MSW waste is disposed in a contiguous geographic space are considered to be one landfill for the purposes of this rule. In performing the calculations, DOC and k values should be applied to the quantity of each type of waste disposed separately and then all results should be added together for all years to determine methane generation under Equation HH-1. This is regardless of whether certain sections/cells are open or closed.

Each separate facility, as defined in 98.6, containing an MSW landfill, as defined above, must be included in a separate annual GHG report.