(1) Ecology's policy under chapter 70A.540 RCW is to reduce methane emissions from municipal solid waste (MSW) landfills.

(2) This rule establishes requirements to reduce methane emissions from both active and closed MSW landfills that have received solid waste after January 1, 1992.

(3) These rules are informed by landfill methane regulations adopted by the California Air Resources Board, the Oregon Environmental Quality Commission, and the United States Environmental Protection Agency.