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Hydrologic data has been obtained from the Modified Permit <br />• Application for Meeker Area Mines and Associated Facilities, Rio Blanco <br />County, Colorado, filed by the Northern Coal Company, June, 1980. <br />Testing of 2 wells in the "G" coal at the Northern Coal Property yielded <br />permeabilities of .04 and 0.1 gallons per day per square fo~c <br />respectively. Their "G" coal may be equivalent to the "F" seam in the <br />permit area. Testing of five wells completed in the "FF" seam coal at the <br />Northern Coal Property yielded an average permeability of 8.6 gpd/ftz. <br />The calculated storativity was 0.00095. Their "FF" coal is inferred to be <br />the equivalent of the "P" seam in the permit area. Modeling of the mine <br />inflows of the No. 5 and No. 9 Mines yielded a transmissivity of 225 <br />gpd/ft, permeability of 19 gpd/ft2, and storativity of 0.002 for both <br />coals (See Section 3.4.7.2). <br />• <br />The coal mines are presently kept from being flooded by continuous <br />pumping. When mining is completed, the mines will begin to refill. Based <br />upon eventual mine areas and expected inflow rates (See Section 3.4.7), <br />the No. 5 Mine will take at least seven (7) years to refill and the No. 9 <br />Mine will take at least three (3) years to refill. The No. 9 Mine should <br />/ not discharge at the surface, but the No. 5 Mine might. Water will not <br />/ discharge from the "E" Seam access to the No. 5 Mine after closure. <br />3.4.3 Hvdrologv of the Alluvium <br />• <br />(REV. 2/14/86) <br />III-51 <br />