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" That’s what’s called a ‘valley fill.’ What they fill it with the coal companies call ‘overburden.’ That’s basically everything they tore off the land: trees, soil, and rock that the coal companies sweep away to get to the seams. They have to put it somewhere. And since West Virginia has a reclamation act, meaning the coal companies have to put the land back close to how they found it, the companies take the overburden, dump it in a valley, hydroseed it, fertilize it, cover it with mulch, and go on their way. Problem is, when they dump "
― David Baldacci , Zero Day (John Puller, #1)