The Green Valley reclaimed coal refuse site, near Terre Haute, Ind., was mined for coal from 1948 to 1963. Subsur-face coal was cleaned and sorted at land surface, and waste material was deposited over the native glacial till. Approxi-mately 2.7 million cubic yards of waste was deposited over 159 acres (92.3 hectares) in tailings ponds and gob piles. Dur-ing 1993, the Indiana Department of Natural Resources, Divi-sion of Reclamation, improved the site by grading gob piles, filling tailings ponds, and covering the refuse with a layer of glacial drift.