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Probable Hydrologic Consequences New Elk !Nine 23 <br />S. WATER LEVELS AND WATER QUALITY IN THE FLOODED NEW ELK MINE <br />Previous production from the New Elk Mine occurred from the Allen coal seam between 1952 and 1988. <br />The mine was temporarily sealed in 1988 and allowed to flood. Monitoring data including the depth to <br />water and water quality were collected for the for the mine pool between February 2001 And November <br />2008. These data are presented in annual hydrologic monitoring reports (Picketwire Processing 2002 -2007; <br />New Elk Coal Company, 2008 and 2009) and are summarized in Figure 6 and Table 15. Active dewatering <br />of the mine resumed from the East Portal Air Shaft in December 2008 to facilitate entry and rehabilitation <br />of the mine. <br />NEW -2 (East Portal Shaft) <br />z �a <br />�0 <br />70804 a I'll F" R e <br />NEW 3(Apache Canyon Sheet NEVEA(Well in Sealed Mine) <br />7 100 <br />7c G ),rto <br />• 3 nFO , <br />7.080 <br />«Fl nnJcrgmund datum concocted to conform to IISC.S scfface mp0grapby by subnazting 100 D fcc) <br />Figure 6. Water Levels in Flooded New Elk Mine <br />Water level data indicate that by late 2004, the elevation of the mine pool near the East Portal Shaft (NEW - <br />2 and NEW4) had stabilized to about 7,111 ft =St. The water level at the Apache Canyon shaft continued <br />to rise until February 2007 when it reached a maximum elevation of 7,095 it Car 1. The gradient across the <br />mine pool at that time was 0.002 ft/ft to the southeast consistent with the regional water table shown in <br />Figure 2. Groundwater in the mine originates mainly from the Allen seam, and between 2001 and 2008, it <br />was a well - buffered, sodium - bicarbonate water with alkaline pH (7.5 to 8.8) and moderately elevated total <br />dissolved solids (average 771 to 1,340 mg/1). <br />• <br />4164A. 110130 aYMMteneAfdve4bN <br />PR 02 Exhibit 8(4) Page 144 Revised 1/31/11 <br />