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RA~~~~ <br />COQVORAigN <br />• <br />2.0 INTRODUCTION <br />Utah International, Inc. is considering the feasibility <br />of disposing of coal ash and SOZ scrubber sludge from the Colorado <br />Ute Craig power station in the Trapper Mine, a coal surface mine <br />operated by Utah International, Inc. near Craig, Colorado. Radian <br />Corporation is currently conducting a program to 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 consiaerations. <br />As part of Radian's program, hydrogeological invest- <br />igations (Task 4) are being conducted. These investigations <br />will provide data necessary for the evaluation of hydrologic <br />impacts resulting from ash and sludge disposal in the Trapper <br />' • Mine. Impacts on ground-water systems and on the Yampa River <br />will be evaluated. <br />I <br />2.1 Hydrogeologic Setting <br />1 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 />I <br />syncline, within the Upper Unit of the Williams Fork Formation. <br />The axis of the Big Bottom syncline is oriented <br />generally east-west, 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 Mountains, cohere the Trapper Mine is located, is <br />on the south limb of the Big Bottom syncline. The strata dip <br />northward toward 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 />2-1 <br />