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HYDRO29908
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Last modified
8/24/2016 8:48:46 PM
Creation date
11/20/2007 11:40:10 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
Hydrology
Doc Date
9/25/1992
Doc Name
ROPOSED DECISION AND FINDINGS OF COMPLIANCE FOR PERMIT REVISION NO TWO SANBORN E TRACT ADDITION
Permit Index Doc Type
OTHER GROUND WATER
Media Type
D
Archive
No
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Discharge of Water into an Underground Mine <br />• 1. Discharge of water to underground workings will not occur. <br />J. Stream Buffer Zones <br />The Division has approved surface and underground mining <br />activities within 100 feet or through perennial streams. <br />This decision was based on a finding that on Hubbard Creek <br />the original stream channel will be restored, water quality <br />and quantity shall not be adversely affected, and appropriate <br />riparian vegetation will be reestablished. On the North Fork <br />of the Gunnison, the decision was based on the fact that the <br />original stream channel would not be affected and water <br />quality and quantity would not be adversely affected. The <br />buffer zone variance was granted for the areas located at the <br />stream crossing and pre-law bench area at the lower Hubbard <br />Creek site and the topsoil stockpile at the upper Hubbard <br />Creek site. The buffer zone variances on the North Fork of <br />the Gunnison are located at the alluvial well and leach <br />fields just above and below the town of Somerset (4.05.18(1)). <br />K. Probable Hydrologic Consequences of Mining (2.05.6(3>(b)(iii)) <br />This section reviews the Probable Hydrologic Consequences (PHC) of <br />mining at the Somerset Mine location. The review includes the <br />probable consequences which will result from the entire Somerset <br />Mine, including the Sanborn Creek Mine and Sanborn East Tract. The <br />• Cumulative Hydrologic Impact Study (CHIS) for the North Fork of the <br />Gunnison River contains a detailed analysis of the cumulative <br />impacts of all currently permitted mine activities within the North <br />Fork of the Gunnison River drainage basin. The CHIS document is <br />available for review at the Division office. This PHC is based <br />upon information contained within Permit No. C-81-022 (Somerset <br />Mine) and upon the analyses contained within the CHIS for the North <br />Fork Gunnison River. The PHC separately addresses potential <br />effects on groundwater and surface water. <br />Effects on Groundwater <br />Mining at the Sanborn Creek area of the Somerset Mine will impact <br />the ground water regime within the immediate area of the proposed <br />operation, but the impact will not cause material damage to the <br />ground water regime. <br />Though the proposed operation will mine both the B and C seams that <br />have been mined before at the old Somerset Mine, the Sanborn Creek <br />Mine will not be connected to the old workings and will be <br />protected by a 100-foot buffer. The old mine is flooded and the <br />proposed buffer will protect the new operation from possible <br />inundation from the old workings. The 100-foot buffer will be <br />maintained by advance drilling to find the location of the old <br />workings <br />• <br />-13- <br />
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