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6.0 Mine Water Information <br />Outfall 011 -Sanborn Creek Mine Water Discharge <br />Outfai1011 is the OMLLC -CDPS mine water discharge point from Sanbom Creek Mine that <br />discharges into Sanborn Creek. Outfa11011 is sampled in accordance with the requirements of <br />the CDPS dischazge permit. <br />The data collected from Outfa11011, along with the results of laboratory analyses are presented <br />in Exhibit 2 -Groundwater Information. Minimum and maximum measurements for the <br />baseline year(s) of this resource maybe referenced in Oxbow's 1998 Annual Hydrology Report. <br />Although analyses of mine water samples may show higher levels than baseline data for some <br />parameters, based on a January 30, 1995, Colorado School of Mines, Division of Environmental <br />Science and Engineering final report entitled, "Aquatic Impairment Study of the Sanbom Creek <br />Mine Discharge, Somerset, Colorado", OMI believes that no impact resulted. The report <br />concluded that mine water dischazges from the Sanborn Creek Mine have minimal effect on <br />stream macroinvertebrates. Also, there is little, if any effect on the overall food base for fish, <br />and the use of the river for fishing is not impaired. <br />The Sanborn Creek Mine water drainage system is scheduled to be decommissioned in 2003 as <br />• the mine completes the last panel, the underground hardware is removed and the entries sealed in <br />accordance with MSHA requirements. <br />The CDMG has received copies of all required submittals of Discharge Monitoring Reports <br />(DMR's) and Whole Effluent Toxicity (Wet) testing reports to the Colorado Division of Water <br />Resources. No significant changes in discharges have been noted during 2002. <br /> <br />12 <br />