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EXHIBIT D (Cont'd) <br />factors and existing facilities. Map Exhibit I-1 depicts <br />current soil conditions and Map Exhibit J-1 depicts the <br />current vegetation on the affected land. <br />A tenant farmer now resides on the property. A farm- <br />house and several outbuildings are located in the southwestern <br />portion of the property owned by the operator, just south of <br />the affected land. The balance of the land is in use for <br />irrigated agricultural crops and for cattle grazing. <br />Geologic Setting. The affected land is located west of <br />the Grand Hogback Monocline on the eastern side of the <br />Piceance Basin. The surface area for miles around is covered <br />by the Tertiary Wasatch and Ohio Creek Formations. The Wasatch <br />Formation (Eocene and Paleocene) is variegated claystone, silt- <br />stone, sandstone and conglomerate with carbonaceous shale and <br />lignite near the base. The maximum thickness is about 5800 feet. <br />The Ohio Creek Formation (Paleocene) is a sandstone and con- <br />glomerate. Near the Town of Silt its thickness is 50 feet to <br />100 feet. The Colorado River has eroded these formations so <br />that riverbottom in the vicinity of the affected land is a little <br />over a mile wide. In this area Quaternary alluvial sand and <br />gravel of Holocene age have been deposited. <br />Test holes drilled on the affected land have encountered <br />sand and gravel deposits that vary from 6 feet to 21 feet in <br />thickness. Contour projections to the north lead us to <br />believe that sand thickness may be as great as 25 feet on <br />-6- <br />