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_GENERAL DOCUMENTS - C1981017 (289)
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_GENERAL DOCUMENTS - C1981017 (289)
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Last modified
11/2/2020 11:52:53 AM
Creation date
6/26/2012 8:22:42 AM
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DRMS Permit Index
Permit No
C1981017
IBM Index Class Name
GENERAL DOCUMENTS
Doc Name
Bid Documents (IMP)
Media Type
D
Archive
No
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DRMS Re-OCR
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Signifies Re-OCR Process Performed
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Mid-Continent Resources' Stream Impairment Study 16 <br /> Given the present results, questions remain concerning the areal extent of the impacts and <br /> the importance of TDS versus natural sedimentation. While impacts measured at Site 5 during low <br /> flow were likely due to sulfates, it is less clear how much of the impact at Site 7 was due to <br /> sedimentation as opposed to sulfates. It is possible that by the time Coal Creek reaches the Crystal <br /> River, sulfates have minimal, if any, effect. <br /> Posey (1993) reviewed historical water quality data collected on Coal Creek and noted an <br /> increase in total dissolved solids (TDS) levels in the stream beginning in 1987. This was the time <br /> when the tunnel intersecting the underground workings of the mine came on line and mine water <br /> began to drain through the portal to the 016 discharge. Posey concluded that although the Crystal <br /> River in the vicinity of Coal Creek and Avalanche Creek had elevated TDS levels, Coal Creek flows <br /> could not account for all of the TDS increase in the Crystal River. <br /> Posey(1993) also noted that the Crystal River Drainage Study conducted from August 1978 <br /> to May 1979 found no trout in the Crystal River between the area above the confluence with Coal <br /> Creek to below the confluence with North Thompson Creek. These data would suggest that 1) <br /> aquatic life on the Crystal River is being influenced by more than the flow from Coal Creek, and 2) <br /> aquatic community distributions on the Crystal River were determined prior to the time when TDS <br /> discharges from the mine became elevated. Sources of upstream impacts on the Crystal River have <br /> not been identified in previous studies of the area. <br /> References <br /> Cooperrider, A.Y., R.J. Boyd, and H.R. Stuart, eds. 1986. Inventory and Monitoring of Wildlife <br /> Habitat. U.S. Department of the Interior., Bureau of Land Management, Denver, CO, 858pp. <br /> Mangum, F.A. 1989. Aquatic Ecosystem Inventory: Macroinvertebrate Analysis. White River <br /> National Forest. USDA-Forest Report. 54pp. <br /> Merritt, R.W., and K.W. Cummins, eds. 1984. An Introduction to the Aquatic Insects of North <br /> America. Second Edition. Kendall/Hunt Publishing Co., Dubuque, Iowa. <br /> Nelson, M.K., G.C. Ingersoll, and F. J. Dwyer. 1987. Proposed Guidelines for Conducting <br /> Sediment Bioassays with Hyalella azzteca, Amphipoda. Draft document submitted to ASTM sub- <br /> committee E-47.03 on Sediment Toxicity. 39pp. <br /> Pennak, R.W. 1989. Freshm ater Ilwertebrates of the United States. Wiley and Sons, New York. <br /> 803pp. <br /> Posey, H. 1993. Final Report: Review of Water Chemistry Data, Mid-Continent Resources. Memo <br /> to Steve Renner, November 15, 1993, State of Colorado, Division of Minerals and Geology. <br /> The SeaCrest Group <br />
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