Marsh gas is another name for biogenic methane.
12.Methane gas explosions can only occur when methane is present in air at concentrations greater than 50%.
13.Philadelphia operates trash incinerators but lacks landfills for isolating the ash.
14.Concrete and asphalt are Group 1 waste materials.
15.The amount of trash that a country produces per unit of land area is just as important as the overall amount.
16.A waste-disposal site's ability to isolate waste is almost entirely determined by its hydrologic and geologic conditions.
17.Compaction at landfills is the only proven way to significantly reduce the volume of municipal solid waste.
18.In the 1950s, low-level nuclear waste was loaded into 55-gallon drums and dumped in the ocean.
19.One of the reasons Yucca Mountain was taken "off the table" as the nation's nuclear waste repository is that the volcanic rocks proved to be younger than originally thought.
20.The U.S. already has at least one underground storage site for transuranic waste.
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