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can be seen in the figure" in stage IV* gas composition reaches <br />pseudo -steady-state conditions. ' <br />The 'gas produced within the landfill is primarily composed of methane <br />and carbon dioxide. The methane component, being lighter than air, may <br />rise through the landfill cover soil or migrate through adjacent soil <br />if these soils are sufficiently permeable' A discussion on landfill <br />gas production and control is contained in the Closure Plan (Appendix <br />B). This discussion includes a development of a methane generation <br />model for the site, information on gas detection devices installed, <br />and Calderon testing performed at the site. <br />R <br />