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West Elk Mine 2004 Annual Hydrology Repon
<br />•
<br />•
<br />Table 5
<br />Summary of Ground Water Monitoring Well Data
<br />19
<br />
<br />Monitoring Well
<br />Location Ground
<br />Elevation
<br />(toc, ft.) Screened
<br />Interval Depth
<br />(ft) Total Depth
<br />
<br />(ft) Formation of
<br />
<br />Completion
<br />Facility Area Wells and Alluvial Wells
<br />P-3 (MW-8) T13S, R90W, Sec. 10, SW,SW 6145.5 25-30 33.8 Colluvium
<br />P-4 (MW-9) T13S, R90W, Sec. 10, SW,SW 6147.5 25-30 33.0 Colluvium
<br />
<br />P-6
<br />T13S, R90W, Sec. 10, SW,SW
<br />6204.8
<br />78-83
<br />83.0 Alluvium
<br />(Syl. Gulch)
<br />
<br />P-7
<br />T13S, R90W, Sec. I5, SW,SW
<br />6205.7
<br />50-55
<br />55 Alluvium
<br />(Syl. Gulch)
<br />PE-1 T13S, R90W, Sec, 10, SW,SE 6187.0 n.a. 30.0 Colluvium
<br />PE-7 TI3S, R90W, Sec. IQ SE,SW 6116.3 n.a. 32.0 Colluvium
<br />UpperDryForkAl[uvial ni T14S, R90W, Sec, 2, SW,NW 8100 24-29 29 Alluvium
<br />owerDry Fork Alluvial °' T13S, R90W, Sec. 34, SW,NW 7640 17.5-22.5 22.5 Alluvium
<br />Permit Area Wells completed in the Barren Member abore F Seam
<br />
<br />OM-80
<br />T13S, R90W, Sec. 21, NW,NE
<br />6854.4
<br />50-90
<br />142.5 Barren Mbr.
<br />Mesa Verde Fm.
<br />
<br />OM-13
<br />T13S, R90W, Sec. 16, SW,NE
<br />6761.9
<br />124-188
<br />188.0 Barren Mbr.
<br />Mesa Verde Fm.
<br />
<br />SOM-45-H1
<br />T13S, R90W, Sec. 29, NE,SW
<br />7703.5
<br />n.a
<br />320.0 Barren Mbr.
<br />Mesa Verde Fm.
<br />
<br />SOM-45-[{2
<br />T13$ R90W, Sec. 29, NE,SW
<br />7703.8
<br />n.a.
<br />260.0 Barren Mbr.
<br />Mesa Verde Fm.
<br />PermitArea Wel ls completed in the FSeam
<br />SOM-2-H T13S, R90W, Sec. 29, SE,NW 7873.6 Open hole S.5 ft. 716.8 F-Seam
<br />
<br />SOM-16-H
<br />T135, R90W, Sec. 28, SW,NW
<br />6029.6 Open hole 1025-
<br />1034 ft.
<br />1034.0
<br />F-Seam
<br />Permrt Area Wel ls completed in the E Seam
<br />6-27-1 T13S, R90W, Sec. 27, NW,NE 7871.5 1270-1290 1320.0 E-Seam
<br />3-11-1 0l T13S, R90W, Sec. 11, SE,SE 6281 240-250 250 E-Seam
<br />OM-3E Ili T13S, R90W, Sec. 34, SE,SE 8051 1015-1035 1035.0 E-Seam
<br />PermitArea Wells completed above the E Seam
<br />6-2-2 T14S, R90W, Sec. 2, NE,NE 7999.0 1063-1083 1540.0 Above E-Seam
<br />Permrt Area Wells completed in B Seam
<br />OM-129-H T13S, R90W, Sec. 16, NE,NE 6269.1 334-362 365.0 B-Seam
<br />o. W-1 T13S, R90W, Sec. 29, NW,SW 8020.0 1320-1380 1380.0 B-Seam
<br />AV-46 T13S, R90W, Sec. 15, SE,SW 6687.0 600-625 630.0 B-Seam
<br />1-11-1 T13$ R90W, Sea I1, SE,NE 6281.3 489-499 509.0 B-Seam
<br />OM-3B 111 T13S, R90W, Sec. 34, SE,SE 8051 1294.5-1315 1415.0 B-Seam
<br />Study Area Well s completed in the F Seam
<br />OM C-76 T13S, R90W, Sec. 33, NW,NE 7579.6 n.a. 457.0 F-Seam
<br />(1) New monitoring well installed in September 2003
<br />3.4 Underdrain and Mine Water Monitoring
<br />Two underdrains and eight mine water inflow sites were monitored in WY 2004. The underdrains
<br />• are located at the lower refuse pile (LRP) and refuse pile expansion (RPE). The LRP underdrain is
<br />located above the sediment ditch at the base of the pile, east of sediment pond MB-2R. The RPE
<br />August 2005 HydroGeo, Inc.
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