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the north of the Edno Mine in the vicinity of Energy Fuels No. 3 Mine, a well <br />~~ penetrating to the Trout Creek Sandstone shows it to be about 225 feet below the <br /> W adge. No effects of mining on the Trout Creek Sandstone are anticipated, <br /> therefore. Because the W adge and the overlying strata are far above the major <br /> drainage channels in the Oak Creek watershed, no significant recharge of These zones <br /> occurs from the Oak Creek watersheds. <br /> The above conclusion is substantiated by water-level data within the permit <br /> boundary. The elevation of the piezometric surface in the Wadge coal and in the <br /> aggregate overburden have been measured at several points. At some locations, the <br /> piezometric head in the aggregate overburden is greater than in the Wadge, but the <br /> reverse is true at other locations. Notwithstanding the different heads in the two <br /> zones at some points, the piezometric surfaces exhibit The same general shape <br /> (Watec, 1978) and the piezometric surface for the Wadge will be used in subsequent <br /> discussions. <br /> The D'Appolonia (1977) study was concentrated in the West Ridge area of the <br /> Edna Mine. Much of this area was mined previously for the Lennox coal and spoil. ~ <br /> piles in excess of 30 years old cover a portion of The area. One of the results of <br /> the D'Appolonia investigation was that the intersection of the piezometric surface <br /> with the Wadge coal on the West Ridge is between 7,224 and 7,300 feet elevation. <br /> W adge coal above this intersection would be expected to contain only unconfined <br /> water. This line of intersection occurs some 1,200 - 1,500 feet upslope from the toe. <br /> Some mining has occurred in The West Ridge area since The D'A ppolonia investigation <br /> was completed and The essential features of these conclusions have been sub- <br /> stantiated. Local, unconfined groundwater has been encountered on The higher <br /> elevations, the old spoil material being the largest contributor to pit inflow. The) <br /> source of this water is deep percolation from precipitation on the area and not fromt <br /> lateral flow through The strata from an exterior recharge area. J <br /> Near the toe of The slope of the West Ridge area, the piezometric surface is <br /> above the Wadge coal and pit inflows have been experienced on the lower portions <br /> of the slope. For example, EBRI was completed in the coal and flowed to the <br /> surface before it was capped and a pressure gage installed. The source of this water <br /> <br /> is believed to be from recharge areas To the west of the Edno Mine. <br /> Relative to the relationship between the piezometric surface, the stream and <br /> the elevation of the Wadge coal, a similar situation exists in the Moffat Area in the <br /> <br />_ northern part of The permit area. Exhibit 2.5-I I shows the piezometric surface <br /> determined from the water level data given in Table 2.5-12. The locations of the <br />Revised 7-81 2.5-47 <br />