PERMFILE40830

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 6/2/2006
• Section_Exhibit Name: Exhibit 18B Evaluation of Potential Groundwater Inflows Associated w/E Seam Mining
• Media Type: D
• Archive: No

Mayo and Associates, I.C
(~ hydraulic communication with each other. Elsewhere in the Wasatch Plateau and the
Somerset Coal Field fault-related groundwater systems in Star Point -Rollins sandstones
are compartmentalized (Mayo and Koontz, 2000; Mayo et al., 2003). The absence of
compartmentalization in the Staz Point sandstones beneath Mine 2 is likely due to the
lazge vertical displacements of the Gooseberry Creek, Pleasant Valley and north- to
northeast trending faults. The north- to northeast trending faults have vertical
displacements as great as 200 feet.
In Mine 3 no major north- to northeast trending faults have been identified. Here the
faults trend east-west, have a maximum vertical displacement of 30 feet, aze associated
with igneous dikes, and are older than the faults beneath Mine 2.
3.6 Bowie and Oxbow Mines (Somerset Coal Field, Colorado)

'~
s
The Bowie mine has extracted coal from the D Seam which is equivalent to the West Ells
Mine E Seam. Oxbow has extracted coal from the B Seam in the Sanbome Creek Mine
and the D Seam (West Elk E Seam equivalent) in the Elk Creek Mine. No large inflows
have been reported from either sandstone channel in the mine roofs or from the mine
floors (Koontz, 2004 Personal communication).
3.7 West Elk Mine (Somerset Coal Field, Colorado)
Mining in the West Elk Mine began in 1982 in the F Seam, which is located near the top
of the Upper Coal Member of the Mesaverde Formation (Figure 12). In 1990 mining was
initiated the B Seam.
Evaluation of Potential Groundwater Inflows 49
Associated with E Seam Mining,
West Elk Mine, Somerset, Colorado
February 24, 2004