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• and lithologic logs for the selected three holes (21011-1, 21012-12 and 310134) were reviewed to <br />determine to which depth each geologic formation extended. The catalogued cuttings were then <br />retrieved and equal volumes of the cuttings from each five-foot interval within a particular geologic <br />formation from a particular hole were combined to obtain the samples for chemical analyses. <br />Four holes (21011-1, 21012-12, 21013-9 and 310134-4) are representative of roof and floor rock in <br />the entire Deserado Mine permit area. Standard procedure during the drilling program was to core <br />the entire coal bearing zone. Cores were described, catalogued, and stored similar to cuttings. Thus, <br />the cores were retrieved and two feet of roof rock and one foot of floor rock from the B and D coal <br />seams were sent to the lab for analysis. <br />The cuttings and core samples were analyzed by qualified labs according to the Wyoming Department <br />of Environmental Quality, Division of Land Qualily, Guideline No. 1, Section II, Pre-mining Overburden <br />Assessment for Coal and Uranium Mines and the previously stated laws and regulation. The appendix <br />contains lithologic logs (cutting descriptions), core descriptions, and chemical analyses for each hole. <br />The appendix is organized by hole number. Hole 21013-9 has only a core description and <br />corresponding chemical analysis since no drill cuttings were sampled from this hole. <br />Geophysical logs from each of the four holes are included as Illustration 1 in the Maps and Illustrations <br />volume of this permit application. The geophysical logs include measurements of natural gamma <br />radiation, electrical resistance and density of the strata in the walls of the boreholes. The caliper curve <br />is a measure of borehole diameter often directly related to competency of strata penetrated by the <br />borehole. <br />II.B.5 Geo-hvdroloav Stratigraphy and geologic structure have a direct and very significant <br />effect upon the location, extent, quantity and quality of subsurface waters within the Deserado mine <br />permit application area. Considerable knowledge of the hydrologic regime was gained during the <br />exploration drilling program. The quantity of water produced in exploration holes when drilling on air <br />tended to increase as the drilling followed the geologic structure down-dip toward the synclinal axis. <br />Quantities of water produced during drilling ranged from zero in shallow (less than 400' deep) holes <br />near the outcrop of the coals to about 20 gallons per minute or so in the deepest holes in the eastern <br />portion of the permit area. Exploration holes which produced water at higher rates during drilling are <br />sporadically located indicating that zones producing water are discontinuous. Water production during <br />drilling tends to taper off before the hole is completed further indicating the limited extent of the <br />groundwater source. The zones producing water of 20 gpm or so are located in the Upper Williams <br />Fork lenticular sandstones. These sandstones are tight due to their high clay content further indicating <br />that permeability is mostly secondary (from fractures and joints in the lenticular sandstones). <br />Three (3) identifiable stratigraphic intervals (upper sandstone facies, siltstone and coal facies, and the <br />lower sandstone facies, see Section II.C-Hydrology Report) were monitored and tested during <br />baseline studies. Subsequently, water levels in 28 bedrock monitoring holes have been monitored. <br />(Permit Renewal #3 1199) II.B-7 <br />