2012-03-27_REPORT - C1982056 - Laserfiche WebLink

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Page 8 of 9 impact post- mining land use pastureland and rangeland in the permit area. Data from monitoring well 97013TC indicate mining has not impaired the use of groundwater from the Trout Creek Sandstone in the permit area, with water levels and quality remaining stable in 2011. The disturbance to the hydrologic balance within and adjacent to the permit area caused by mining and 22. Minimize reclamation at the Foidel Creek disturbance to CDRMS regulation Mine is the minimum that can be hydrologic balance 4.05.1(1) YES expected from an underground within and adjacent to mining operation at this location. the permit area Use of best management practices indicates minimization of disturbance to the hydrologic balance. Surface water— Mine pumping into Fish Creek at site 115 had ceased in mid -2006, and was reactivated in 2008. In 2011, Site 115 discharged in January for two days due to a crack in a pipeline valve where treated water flows underground. No further discharges occurred at the Site. Due to the discharge at Site 115 required downstream sampling was conducted at surface creek 23. Prevention of sites 29, 301, 1003, 69, and 1005 material damage to the CDRMS regulation for conductivity and sulfate with hydrologic balance 4.05.1(1) YES no exceedances noted. Discharge outside the permit area at 10RT was initiated in early September 2008 due to a rise in water levels within sealed mine areas. During discharge, downstream water samples were collected to verify potential impacts. Samples were collected at Trout Creek (Site 1005) downstream of confluences from Fish Creek and Foidel Creek. Subsequent water quality data from 10RT raw effluent indicated exceedances for FeTR and WET tests. TCC discontinued discharge at 10RT in early 2009 and pumped