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<br />M2593 <br /> <br />5.2.3 Five small 1ands1 Ides were identified within the perimeter of <br />the reservoirs, These masses are heterogeneous mixtures with a silt, <br />clay, and sand matrix containing angular sandstone fragments and <br />decomposing shale. All appear to be dry and stable with no evidence of <br />recent movement, The potential for further mass wasting of these <br />sl Ides Is minimal and the volume of the material Involved would not be <br />sufficient to adversely affect safe operation of a reservolr.(24) <br /> <br />5,2.4 The dam would be designed to withstand a horizontal <br /> <br /> <br />acceleration of at least forty percent of gravitational acceleration. <br /> <br /> <br />The seismic activity historically associated with the Rangely area <br /> <br /> <br />should not pose a significant hazard to the dam's Integrity or safe <br /> <br /> <br />ope rat i on of a reservo I r, The max imum probable acce 1 erat Ion <br /> <br /> <br />predicted for an event with a magnitude of 6,5 Is twenty percent of <br /> <br /> <br />gravitational acceleration. The reaction of existing dams to measured <br /> <br /> <br />seismic events In California show that In most cases, earthquake loads <br /> <br />applied In static stability analyses are conservative. This would <br /> <br /> <br />Indicate that the analysis performed on this dam design will provide <br /> <br /> <br />an adequate margin of safety. <br /> <br />5.2.5 Seepage losses from a reservoir Into the shales and sandstone <br /> <br /> <br />beneath It are expected to be minimal, Because the dip of the bedrock <br /> <br /> <br />Is generally upstream and under thick sections of younger sedimentary <br /> <br />beds to the north and east, water entering bedrock beneath the <br /> <br /> <br />reservol r would not be expected to seep to the surface. The coal <br /> <br />bear I ng beds of the Mesa Verde format Ion 1 i e above the beds to be <br /> <br /> <br />covered by a reservoir, The permeability and lenticular (lense like) <br /> <br /> <br />nature of the beds do not allow significant water movement <br /> <br /> <br />perpendicular to the bedding, and as a result no significant change In <br /> <br /> <br />the water table surface In the coal bearing sections Is expected. <br /> <br /> <br />Surface outcrops of coal beds and potential portal locations for <br /> <br />mining of beds would not be inundated by the reservoir, The potential <br /> <br /> <br />exists for 011 and gas production from sandstone formations beneath <br /> <br /> <br />the reservoir sites. A reservoir would limit surface access, but <br /> <br />directional drilling from adjacent land could be utilized to develop <br /> <br /> <br />any such reserves.(24) <br /> <br />43 <br /> <br />, <br /> <br />I <br />f, J <br />