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Discharge of Water into an Underground Mine Discharge of water to underground workings will not occur. Stream Buffer Zones The Division has approved surface and underground mining activities within 100 feet or through perennial streams. This decision was based on a finding that on Hubbard Creek the original stream channel will be restored, water quality and quantity shall not be adversely affected, and appropriate riparian vegetation will be reestablished. On the Ncrth Fork of the Gunnison, the decision was based on the fact that the original stream channei would not be affected and water quality and quantity would not be adversely affected. The buffer zone variance was granted for the areas located at the stream crossing and pre-law bench area at the lower Hubbard Creek site and the topsoil stockpile at the upper Hubbard Creek site. The buffer zone variances on the North Fork of the Gunnison are located at the alluvial well and leach fields just above and below the tcwn of Somerset (4.05.18(1)). Probable Hydrologic Consequences of Mining (2.05.6(3>(b)(iii)) This section reviews the Probable Hydrologic Consequences (PHC) of mining at the Somerset Mine location. The review includes the probable consequences which will result from the entire Somerset Mine, including the Sanborn C~•eek Mine and Sanborn East Tract. The Cumulative Hydrologic Impact Study (CHIS) for the North Fork of the Gunnison River contains a detailed analysis of the cumulative impact; of all currently permitted mine activities o-~ithin the North Fork of the Gunnison River drainage basin. The CHIS dccument is available for review at the Division office. This PHC i; based upon information contained wi*.hin Permit No. C-81-022 (Somerset Mine) and upon the analyses contained within the CHIS for the North fork Gunnison River. The PHC separately addresses potential effects on groundwater and surface water. Effect; on Groundwater Mining at the Sanborn Creek area of the Somerset idine will impact the ground ~.vater regime within the immediate area of the proposed operation, but the impact will not cause material damage to the ground water regime. T'noug'n the proposed operation will mine 'ooth the 3 and C seams that have been mined before at the old Somerset 14ine, the Sanborn Creek Mine will not be connected to the old .corking; and ~.aill be protected by a 100-foct buffer. The old mine is rlooded and the proposed buffer will protect the need operation fr.cm oos;ibie inundation from the old ~.corkings. the 100-foot hurt?r will be maintained by advance drilling to find the location of the old workings _1,_