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' 2.04.5(1)(b) <br />~• The elevation of the water table across the lease is variable <br />and unpredictable. From the observation wells 3rilled it has <br />been impossible to establish a trend to estimate the water <br />table elevation. It varies by structur?, topography, and <br />' location. For the same reasons the potentiometric surface <br />is a present indeterminable. <br />' (2) modeling '^echniques. ?~o modeling techniques have been <br />included. <br />(3) Extrapolation of Data. Data presentee' above was derived <br />' directly from investigations on the site and in the area near <br />the site. ::uch of the information was obtained from the ARCC <br />' Permit Application. <br />Section 2.04.6 Geology Description <br />(1) Surface "".fining. D]ot applicable. <br />(2) Underground Mining. <br />' (a) General description of geology within the affected area. <br />The general geology of this portion of the southeast Piceance <br />Easin consists of gently north-northeast dipping beds of <br />sandstone, shale, and coal of upper Cretaceous and early <br />Tertiary age. The main coal beds are found in the L'pper <br />Cretaceous Mesaverde Group which is overlain by the early <br />Tertiary Ohio Creek Conglomerate and underlain by the Upper <br />Cretaceous rancos Shale. I:ocally the r:esaverde is about <br />2,500 feet thick and is comprised in ascending order of the <br />Rollins Sandstone Member, the ?mower Coal N.ember, the Upper <br />Coal tlember, and the Barren ";ember. The latter is overlain <br />by a barren sandstone bed. <br />REVISED C?ay 15, 1981 3-~ <br />