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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />0025<)2 <br /> <br />sandstone, claystones, and sandy shales, commonly with thin gypsum <br />seams. These rocks are highly permeable in the upper portions but <br />are nearly impervious with depth (1). <br /> <br />The presence of thin gypsum seams in the bedrock combined <br />with the nearly horizontal attitude of the bedrock suggests that <br />seepage could occur along the bedding planes, The added weight of <br />the reservoir could then cause displacement of the bedrock along <br />these bedding planes, An impervious blanket constructed over the <br />areas of the sandstone outcrops upstream of both abutments would <br />reduce the amount of water entering the bedrock. Also rock fill <br />could be added at the downstream toe to buttress the dam against <br />movement (1). <br /> <br />3. Geological Hazards <br /> <br />There are no unstable or swelling soils in the dam and <br />reservoir sites nor are there any unstable rock slides or mud slides <br />in the area, There are several short normal faults which cut the <br />basal Mesa Verde rocks on the southeast flank of the Rangely anticline, <br />but none were found in the dam and reservoir area (1). It is believed <br />there are no hazards of a geological nature in the project area. <br /> <br />4. Mineral Resources <br /> <br />The proposed reservoir is in the heart of an energy rich <br />region, The Lower White River coal field includes the area along <br />the northern edge of the Uinta region in southern Moffat and western <br />Rio Blanco Counties, Coal Ridge, Calamity Ridge and the Cathedral <br />Bluffs are included in this field. All of the known coal resources <br />of the field are in the Williams Fork formation of the Mesa Verde <br /> <br />Il-12 <br />