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application). Almost all of the waste will be coal combustion a:~h and sludge <br />from the Craig power plant. The main elemental components oFthe <br />combustion wastes aze: barium, calcium, iron, magnesium, potassium, silicon, <br />and titanium. Adequate ground water monitoring is in place to detect any <br />ground water problems eazly-on so mitigative measures can be implemented. <br />The original permit application predicted that the excavation of pits on Trapper <br />could temporarily draw down water levels in local aquifers by a few feet at a <br />distance of one mile from the permit boundary (page 4-226 of permit <br />application). The predictions proved inaccurate as no draw doNTLS were <br />detected in wells at those distances. Observed drawdowns have been been <br />temporary and aze limited to the itnmediate vicinity of the pits.'l~he operator <br />expects such limited drawdowns to continue with future mining (page 4-226e <br />of permit application). Drawdowns may be so azeally limited b~:cause the mine <br />is on the updip edge (neaz the drainage divide) of the local hydr~~logic basin. <br />The proposed mining operation will have little if any effect on the post-mining <br />rechazge capacity. The applicant's studies concluded that the rechazge capacity <br />of the reclaimed spoils will actually be slightly higher than the pre-mirte <br />condition. The applicant estimated the pre-mining i~ltration rtte to be <br />approximately 10'' to 10~ cm/sec. Reclaimed spoils aze expected to have an <br />infiltration rate of 10'' to 10'' cm/sec. The mine activities should not impact <br />any regional aquifers except the Third White Sandstone. Mined strata dip faz <br />beneath the Yampa River alluvial aquifer and communication oz these strata <br />with the alluvial aquifer is negligible. <br />During the review for Permit Revision PR-Ol, the Division raised the issue that <br />any degradation of water quality in a well that is owned by one .if Trapper's <br />neighbors, the Lux well, could push the well's water quality beyond the <br />secondary drinking water standazds because the pre-mining quality of the <br />well's water bazely met those standazds. Monitoring was required by attaching <br />the following stipulation to Trapper's permit. <br />Stipulation No. 12: <br />TRAPPER MINE WILL MONITOR THE QUALITY AND THE LEVEL OF HATER FOR THE <br />AQUIFER OR WATER BEARING ZONE IN WHICH THE LUX WELL IS COMPLETED AND <br />WHICH APPEARS TO BE AN AQUIFER WHICH TRAPPER IS NOT CURRENTLY <br />MONITORING. THIS MONITORING MAY BE DONE BY MEANS OF THE LUX WELL <br />ITSELF, IF THE OWNER IS AGREEABLE, OR BY Iv1EANS OF A SEPARATE WELL. IF .4 <br />SEPARATE WELL IS UTILIZED FOR THE IvIONITORING, IT SHALL BE COMPLETED IN <br />THE EQUIVALENT ZONE OR AQUIFER IN WHICH THE LUX WELL IS COMPLETED. IT <br />SHALL BE LOCATED AT A POINT DIRECTLY UPDIP FROtvf THE LUX WELL WHERE <br />THE ENTIRE ZONE Of THE LUX W ELL CAN BE MONITORED AND IT SHALL BE AT A <br />Trapper Mine 22 May 13, 1998 <br />