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Mayo and Associates, LC <br />• Van Wagoner et al., 1990). The underlying marine mud, which is as thick as 5,000 feet <br />and is generally non-water bearing, is know as the Mancos Shale. The general <br />depositional relationships between subaerial plain mud and sand, shoreface sand, coal, <br />foreshore sand, and deep-water shale are shown in Figure 2. <br />In the Uinta Basin the Mesaverde Group consists of four formations that in descending <br />order are the Price River Formation, Castlegate Sandstone, Blackhawk Formation, and <br />Star Point Sandstone. Only the lower Blackhawk Formation (i.e., coal bearing), Star <br />Point Sandstone, and Mancos Shale are of significance to this investigation. Tn the <br />Somerset Coal Field, in the Piceance Basin, the Mesaverde Group consists of five <br />members that in descending order consist of the Ohio Creek Member, Barren Member, <br />' ~ Upper Coal Member, Lower Coal Member, and Rollins Sandstone. Only the Upper and <br />Lower Coal Members, Rollins Sandstone, and Mancos Shale aze of significance to this <br />investigation. The Upper and Lower Coal Members are depositional equivalents to the <br />middle and lower Blackhawk Formation and the Rollins Sandstone is equivalent to the <br />Staz Point Sandstone. In West Elk Mine the E Seam is in the middle of the Upper Coal <br />' Member and the B Seam is in the lower portion of the Lower Coal Member. <br />2.2 Styles of groundwater inflows <br />Mayo and Morris (2000) and Mayo and others (2003) describe groundwater flow regimes <br />as active or inactive based on an analysis of groundwater systems in the Wasatch Plateau. <br />They found that groundwater inflows in Utah and Colorado underground coal mines issue <br />~. from groundwater systems that aze part of the inactive groundwater regime, that is they <br />r Evaluation of Potential Groundwater Inflows 17 February 24, 2004 <br />Associated with E Seam Mining, <br />West Elk Mine, Somerset, Colorado <br />