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Cocvonanae~ <br />2.0 <br />•~ <br />.) <br />INTRODUCTIOy <br />Utah International, Inc, is considering the feasibility <br />of disposing of coal ash and S0~ scrubber sludge from the Colorado <br />Ute Craig po:aer station in the Trapper :line, a coal surface mine <br />operated by Utah International, Inc, near Craig, Colorado. Radian <br />Corporation is currently conducting a program co describe general <br />feasibility and the best suitable plan for this mine waste disposal. <br />The final result of Radian's program will be the description of <br />the best disposal plan according to environmental, economic, and <br />engineering considerations. <br />As part of Radian's program, hydrogeological invest- <br />igations (Task 4) are being conducted. These investigations <br />will provide data necessar;~ for the evaluation of hydrologic <br />impacts resulting from ash and sludge disposal in the Trapper <br />Mine. Impacts on ground-caater s;~stems and on the Yampa River <br />will be evaluated. <br />2.1 HydroKeologic Setting <br />Figure 2-1 is a geologic map of the study area. The <br />Trapper Mine is situated on the southern flank of the Big Bottom <br />syncline, within the Upper Unit of the Williams Fork Formation. <br />The axis of the Big Bottom syncline is oriented <br />generally east-caest, and it passes directly through the Craig <br />Station power plant site (Figure 2-1). The strata on either side <br />of the axis dip inward toward the axis. The north slope of the <br />Williams Fork :fountains, where the Trapper Mine is Located, is <br />,on the south limb of the Big Bottom syncline. The strata dip <br />northward tocaard the synclinal axis. The axis of the Big Bottom <br />Syncline bends to the northwest where it is crossed by the Yampa <br />River. The syncline also plunges to the west and northwest. <br />I <br />i. <br /> <br />2-1 <br />