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EXHIBIT D (Cont'd) <br />Piceance Basin. The surface area for miles around is covered <br />by the Tertiary Wasatch and Ohio Creek Formations. The <br />LYasatch Formation (Eocene and Paleocene) is variegated clay- <br />stone, siltstone, sandstone and conglomerate with carbonaceous <br />shale and lignite near the base. The maximum thickness is <br />about 5800 feet. The Ohio Creek Formation (Paleocene) is a <br />sandstone and conglomerate. Near the Town of Silt its thick- <br />ness is 50 feet to 100 feet. The Colorado River has eroded <br />these formations so that riverbottom in the vicinity of the <br />affected land is a little over a mile wide. In this area Quater- <br />nary alluvial sand and gravel of Holocene age have been deposited. <br />Backhoe tests reached a depth of approximately 15 feet, <br />encountering from 8 to 15 feet of sand and gravel. Projections <br />from nearby areas indicate that the thickness of the commercial <br />sand and gravel deposit will average approximately 25 feet. <br />The holes also encountered overburden that varies in thick- <br />ness from 0 to 7 feet. This overburden overlays the alluvial <br />sand and gravel. The thickest overburden was encountered on <br />the south part of the property near the county road. <br />The Wasatch-Ohio Creek Formations are the bedrock beneath <br />the sand and gravel deposits and will provide a firm, fairly <br />even and smooth pit floor. <br />-6- <br />