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2.C4.~ General Descriptien of Hydrology and Geology • This application provides a description of neology and hydrology on all lands within the permit area, the adjacent area, and the general area, as defined in Section 1.04 of the Colorado Regulatory Program. The Mt. Harris Coal Company is located in Routt County along the Yampa River. The general area is characterized by the Yampa River and side perennial, intermittent, and ephemeral drainage which separate the adjacent lands located both north and south of the Yampa River. In the vicinity of the permit area, the structure of the basin has been modified by many folds. The largest of these is the Tow Creek Anticline, which is located several miles east of the loadout and is an oil producing area. Other major folds in the area are the Wolf Creek Dame, the Chimney Creek Dome, the Williams Park P,nticline, and Twentymile Park. The areal structure has also been modified by numerous • faults, which are shown on Map 2, Regional Geology/Hydrology. Several Upper Cretaceous geologic formations crop out in the area. They are, in ascending order, the Mancos Shale, the Iles Formation, the Williams Fork Formation, and the Lewis Shale. The Iles and Williams Fork Formations comprise the Mesaverde Group and contain the lower Mesaverde coals and the middle and upper Mesaverde coals, respectively. None of the formations mentioned abcve are known to be aquifers in the vicinity of the mine. Quaternary alluvial deposits along the Yampa River are the main sources of ground water in the area. In addition, ephemeral streams have been dammed to provide water for livestock in several localities in the vicinity of the mine. The Yampa River provides drainage for Northwest Colorado and is a • tributary of the Green River which eventually flows into the Colorado River. Snowmelt is the principal source of water for the Yampa River 2.04.5-1