2008-03-21_PERMIT FILE - C1980007A ‎(4)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 3/21/2008
• Section_Exhibit Name: 2.04.7 Hydrology Description
• Media Type: D
• Archive: Yes

West Elk Mine
measurements of well SOM 23-H-2 in the mid 1990s indicated that water was cascading
(flowing) into the well casing from above the water level bringing the suitability of this well for
monitoring purposes into question. As a result, this well was removed from the monitoring
program in 1998.
Development mining in the E Seam to-date (August 2004) has not resulted in any groundwater
inflows from either floor springs or roof drippers. Development mining that occurred in June
through July 2004 in the E Seam was to the south and southeast from the F to the B Seams in mine
access slopes. The roof lithology is dominated by a sandstone channel and channel splay deposits.
Several prominent dilated fractures sets are present in the developed entries. No water has entered
the mine from the channel sandstone, splay deposits, or fractures. This suggests only that the E
Seam coal is apparently dry in the areas developed to date.
•

Table 6
Summary of Slug Test Data(')
Geologic Unit Screened Interval Transmissivity Permeability Permeability
Well No. Tested (gpd/ft.) (gpd/fe) (cm/sec)
A-1 Colluvium 66 -- --
A-2 Alluvium 1234
A-3 Colluvium 59 -- -
SOM-1-H Barren Member 600 6.67 3 x 10
SOM-22- Barren Member Sandstone, Shale & Coal 2283 -- --
H-1
SOM-38- Barren Member Sandstone & Shale 49.5 1.1 5 x 10
H-1
SOM-38- Barren Member Sandstone & Shale 0.4 0.004 2 x 10
H-2
SOM-45- Barren Member Sandstone -- -- --
H-1
SOM-45- Barren Member Sandstone, Shale & Coal 1.56 -- --
H-2
SOM-80 Barren Member Sandstone & Shale 0.52 0.006 3 x 10
03-11-113) E Seam Coal -- -- 5 x 10-5
SOM-2-H F Seam Coal 0.028 -- -
SOM-16 F Seam Coal -- -- -
SOM-23- B Seam Coal 15.6 1.04 5 x 10
H-1
SOM- F Seam Coal 61 4.1 2 x 10
C76A
SOM-127- B Seam Coal 3.3 0.083 4 x 10°
H(4)
SOM- B Seam Sandstone Above B Seam 9.01 0.191510.042'61 9 x 10° 2 x 10
C7214)
03-11-1 E-Seam Coal 10.0 1.04 5 x 10'
Footnotes:
(1) See also Exhibits 17 and 71
(2) Permeability calculated from transmissivity unless otherwise noted
(3) Permeability calculated using a rising head permeability test
(4) Permeability calculated by the Hvorslev Method
(5) Calculated from the first 14 points of the slug test data
6 Calculated from the last 6 points of the slug test data
2,04-68
Revised June 200.1 PRIG, March 2006; Rev. April 2006 PRIO, Sep. 2007PR12