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a combination of the following effects: <br />• Minor faulting <br />• Coal washout (silt channel) <br />• Localized folding of the coal beds. <br />In order to evaluate the hydrologic regime in the overburden an overburden <br />fluid level map has been generated by computer modeling (see Exhibit 41). <br />The specific locations of subsurface water zones are illustrated utilizing <br />the extensive exploration drilling program data. Geophysical (resistivity) <br />and drillers log data were used to locate and map water producing zones <br />along with bore hole water levels. This data is presented in the form of <br />a water level contour map (piezometric fluid surface map) for the <br />overburden. During developmental and exploratory drilling most of the <br />holes revealed dry overburden. Any bodies of water contained in the <br />overbruden will be lenticular extremely localized in extend and probably <br />perched above the coal aquifer. Relatively dry overburden and localized, <br />lenticular water bearing strata are characteristic of coal sequences <br />throughout the west. At the H-G Mine these factors are directly <br />attributable to: <br />• Limited recharge lateral extent (outcrops) <br />• Limited precipitation <br />• Lack of suitable aquifer material in the overburden <br />• The vertical movement of precipation recharge to the coal <br />aquifers <br />• <br />25 <br />