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Section 779.13 (c) Continued. • geologic and hydrologic conditions exist. Modeling techniques have been used only to project the potential cumulative hydrologic impact of mining. The modeling techniques used in this application are mathematical and are based on Fried's Law. Input to Fried's equation are data from existing site-specific sources which are used to determine the qualitative effects of mining on ground water through time at points outside the mine area. The modeling tech- niques used to determine the quantitative effects of mining on ground water are mathematical and are based on Darcy's Law. A detailed discussion on modeling techniques used to predict the cumulative hydrologic impacts is presented under Section 780.21 (c). This method of modeling each stage of mining was chosen to provide site-specific data and verifiable conclusions. Section 779.14 Geology Description. • (a) The description shall include a general statement of the geology within the proposed mine plan area down to and including the first aquifer to be affected below the lowest coal seam to be mined. Geologic Structure The coal to be mined by the proposed operations is located at the southeasternmost tip of the Yampa Coal Field of the Green River Region. The Yampa Coal Field is a synclinal extension of the Washakie-Sand Wash Structural Basin of northwestern Colorado and south-central Wyoming. This structural setting is outlined in Figure 5, Geologic Structural Setting. The main axis of the basin is highly modified by numerous smaller anticlines, synclines and faults. The boundary of the Yampa Coal Field is defined to the southwest by the Axial Basin Anticline and is defined on the east by the Park Range llplift. Energy Mines No. 1 and 2 and the Eckman Park area are structurally • situated along the flanks of the locally significant Twentymile 779-11