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III IIIIIIIIIIIII III <br />999 <br />Doc Date:12/11/2001 <br />(I( 2.04.7 HYDROLOGY DESCRIPTION <br />Groundwater Information <br />Information on groundwater resources in the mine, loadout, and adjacent <br />areas has been obtained through exploration drilling, ongoing monitoring <br />activities, and review of available geologic information and water <br />rights/use documentation. This updated hydrology description represents <br />a consolidation of previously submitted hydrology information and recent <br />monitoring data. In order to provide full documentation, previously <br />submitted hydrology information has been formatted and is included in this <br />submittal as Exhibit 7, Hydrologic Information. <br />Underground mining operations at the Southfield Mine will effect the Jack <br />O'Lantern and Red Arrow coal seams which occur within the Late Cretaceous <br />Vermejo formation. The Vermejo formation which is approximately 900 feet <br />thick is overlain by the Raton and Poison Canyon formations both of Late <br />Cretaceous to Early Tertiary Age.— Surficial-materials are geologically <br />recent colluvial/alluvial out -wash deposits derived from mass wasting and <br />erosion of the adjacent Wet Mountain uplift to the west. The Vermejo <br />formation is underlain by the Trinidad Sandstone which is a massive <br />sandstone considered to be the basal unit in this area. Essentially all <br />of the units noted have some water storage and transmission capabilities. <br />Each of these strata were evaluated to determine if geologic and hydraulic <br />criteria for designation as an aquifer as defined by Rule 1.04 (14) are <br />applicable. <br />In the mine area, evaluation of groundwater resources is based primarily <br />upon exploration drilling, records of groundwater use, information on <br />regional groundwater characteristics, monitoring information, information <br />on groundwater inflows to the Southfield workings and available <br />information on abandoned underground mines in the area. <br />The loadout operations involve surface disturbance only. Any potential <br />• groundwater impacts will be confined to surficial colluvial/alluvial <br />2.04.7-1 <br />