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<br />1 <br />' 2.04.5(1)(b) <br />The elevation of the water table across the lease is variable <br />and unpredictable. From the observation wells drilled it has <br />been impossible to establish a trend to estimate the water <br />table elevation. It varies by structure, topography, and <br />location. For the same reasons the potentiometric surface <br />' is a present indetermina!~le. <br />' (2) Modeling Techniques. No modeling techniques have been <br />included. <br />' (3) F..xtrapolation of Data. Data presentee' above was derived <br />' directly from investigations on the site and in the area near <br />the site. <br />' Section 2.04.6 Geology Description <br />' (1) Surface D".iriing. Diot applicable. <br />' (2) Underground Mining. <br />' (a) General description of geology within the affected area. <br />t The general geology of this portion of the sout?:east Piceance <br />Easin consists of gently north-northeast dipping beds of <br />sandstone, shale, and coal of [Ipper Cretaceous and early <br />' Tertiary age. The main coal beds are found in the C'pper <br />Cretaceous Mesaverde Group which is overlain by the early <br />' Tertiary Ohio Creek Conglomerate and underlain by the Upper <br />Cretaceous Piancos Shale. I:ocally tl~e Piesaverde is about <br />' 2,500 feet thick and is comprised in ascending order of the <br />Rollins Sandstone Member, the Lower Coal N:ember, the Upper <br />Coal Member, and the Harren Member. The latter is overlain <br />by a barren sandstone bed. <br />1 <br />' 33 <br />