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West Elk Mine 2003 Annual Hydrology Report
<br />36
<br />Table 12
<br />Recommended Hydrologic Monitoring System Revisions
<br />C
<br /> Approximate Screened Interval
<br /> Location Ground Depth Total Depth Formation
<br /> Elevation tft)
<br />Eliminated S rin s ft. (ft)
<br />G-26 T13S, R90W, Sec. 19, SE, NW 6960 - - - - Colluvium
<br />G-28a T13S, R90W, Sec. 19,NW,SE 7057 -- -- Colluvium
<br />G-30 T13S, R90W, Sec. 19, NE,SW 6900 -- -- Alluvium
<br />G-31 T13S,R90W,Sec.19,SW,SW 7027 -- -- Alluvium
<br />G-35 T13S, R91 W, Sec. 24, SW,NE 6814 - - - - Colluvium
<br />G-49 TI3S, R91 W, Sec. 24, NW,NE 6400 - - - - Colluvium
<br />Eliminated Surface
<br />Stations
<br />Lower Gribble Gulch TI3S, R90W, Sec. 19, SE, NW 6600 - - - - - -
<br />Eliminated Wells
<br />SOM-2-H T13S, R90W, Sec. 29, SE,NW 7870 Casin Colla sed 716.8 F-Seam
<br />SOM-16-H TI3S, R90W, Scc. 28, SW,NW 8030 Casin Colla sed 1034.0 F-Seam
<br /> Barren mbr.
<br />SOM-45-H1 T13S, R90W, Sec. 29, NE,SW 7700 Casin Colla sed 320.0 Mesa Verde Fm.
<br />So. W-1 T13S, R90W, Sec. 29, NW,SW 8020 Casin Colla sed 1380.0 B-Seam
<br />96-27-I TI35, R90W, Sec. 27, NW,NE 7870 Casin Colla sed 1320.0 E-Seam
<br />New Wells
<br />SOM-3 B, SOM-3 E,
<br />L. Dry Fork Alluvial Details presented in Table 5 - - - - - - - -
<br />U. Dry Fork. Alluvial
<br />03-I1-1 E
<br />Tn WY2003 the West Elk Mine monitoring system was operating as designed and provided
<br />adequate data to assess potential mine induced impacts to the area's hydrologic system, with the
<br />exception of data collected at three stream stations and five wells. Upper Deep Creek, Lower Deep
<br />Creek, and Upper Dry Fork surface water stations that are not functioning properly due to changing
<br />stream characteristics. The casing in wells SOM-45-H1, SOM-2-H, SOM-16-H, 96-27-1, and
<br />SO.W-1 have collapsed during the past several years rendering them dysfunctional.
<br />Pressure transducers and data loggers were installed in the open stream channels at the Deep Creek
<br />stations. Control channel sections were established at each site. Flumes were not installed at these
<br />locations to limit impacts based on U.S. Forest Service (USFS) conditions. The Deep Creek stream
<br />channel is very dynamic and has changed considerably since the sites were established. As a result
<br />of erosion and sediment deposition the control channels used to calibrate the pressure transducers
<br />and gauge the stream flows are constantly changing and the flow data collected for Deep Creek in
<br />WY2002 and WY2003 is not considered accurate. The data and graphs presented in this report
<br />September 2004 HydroGeo, Inc.
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