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REP42347
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REP42347
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Entry Properties
Last modified
8/25/2016 12:44:13 AM
Creation date
11/27/2007 9:34:15 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
Report
Doc Date
3/13/2006
Doc Name
2005 Annual Hydrology Report
From
Oxbow Mining LLC
To
DMG
Annual Report Year
2005
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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<br />A review of the data supports the conclusion that the transfer of water from D seam to the B <br />seam had an imperceptible effect on the B seam water level. In addition, since the floor of the <br />historic Somerset B Seam Mine portal is at the approximate 6090' elevation, there remains <br />approximately 45' of elevation remaining before the water could exit the mine at that location. <br />Exhibit 2 -Groundwater Information also contains the results of transferred water samples <br />obtained on January 13, 2005 and June 8, 2005. The data suggests no anomalies. <br />SC-1 Well -Rollins Sandstone <br />Monitor well SC-1 is located just east of the reclaimed Sanborn Creek mine portal area. <br />Well SC-1 was completed in the Rollins Sandstone, which is located 40 to 50 feet below the B- <br />Seam. Monitoring data were historically collected from well SC-1 prior to any substantial <br />mining in the B-Seam of the Sanbom Creek Mine. The SC-1 well is located up-gradient relative <br />to the Rollins Sandstone unit which is located stratigraphicallyundey the footprint of the mining <br />activities. <br />Water in the Rollins Sandstone is confined to limited localized zones that are fractured and/or <br />contained above the Rollins, as evidenced by water level measurements that are well above the <br />• top of the sandstone member. Water quality is poor, with high total dissolved solids as sodium <br />chloride. Inflow and recovery of the water levei in the drill holes indicates very low <br />permeability and porosity of the sandstone. There has been some variability in the water levels <br />measured in well SC-1 but there has been no apparent trend or indication of impact. No <br />significant difference in the 2005 monitoring results from baseline or historical measurements <br />was noted in well SC-1. <br />The limited water quantity and poor water quality suggests there is limited transmissivity <br />between the North Fork of the Gunnison River alluvium through the Rollins sandstone down- <br />gradient towards the area associated with the Sanborn Creek Mine. <br />SC-3 Well - B-seam Coal -Sanborn Creek Mine <br />Monitor well SC-3 is located east of the Sanborn Creek reclaimed mine portal area along the <br />entrance to the pre-existing ranch road to Coal Gulch. <br />Monitoring well SC-3 was completed into the B Seam coal. Monitoring data were collected <br />from well SC-3 prior to any substantial mining in the B-Seam of the Sanborn Creek Mine. The <br />SC-3 well is up-gradient relative to the B seam underground mining activities but down-gradient <br />from the North Fork of the Gunnison River <br />The plastic pipe casing is squeezed at the 20 foot level making it difficult to lower a bailer. <br />• Using a smaller diameter bailer we have found very minimal water available in the well. In fact <br />there are times when the initial bailing of the well to remove one volume effectively drains the <br />available water. The lack of water in the well and the poor water quality suggests there is little <br />13 <br />
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