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• 6.0 Mine Water Information <br />Outfall 011 -Sanborn Creek Mine Water Discharge <br />Outfall 011 is the OMLLC -CDPS mine water discharge point from Sanbom Creek Mine that <br />discharged into Sanbom Creek. Outfal] O11 was sampled in accordance with the requirements of <br />the CDPS discharge permit. <br />The data collected from Outfall 011, 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 may be referenced in the OMLLC 1998 Annual Hydrology <br />Report. <br />Although analyses of mine water samples may show higher Ievels 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", OMLLC believes that no impact resulted. The report <br />concluded that mine water discharges from the Sanborn Creek Mine had minimal effect on <br />stream macroinvertebrates. Also, there was little, if any effect on the overall food base for fish, <br />and the use of the river for fishing was not impaired. <br />• The Sanborn Creek Mine water drainage system was decommissioned on May 21, 2003. Since <br />the mine completed it's last panel, the underground hardware was removed and the entries were <br />sealed in 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 forwarded to the Colorado Division <br />of Water Resources. No significant changes in discharges were noted during the short time that <br />Outfall 011 discharged in 2003. <br /> <br />13 <br />