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Chris Gilbreath <br />Page 2 <br />October 14, 2014 <br />Please discuss these apparent impacts of the Colowyo Mine on water quality in the receiving waters in the <br />context of the Probable Hydrologic Consequences within the Colowyo PAP and in light of the following. <br />High TDS values can cause a decrease in the water's usefulness for agriculture purposes. This has been <br />widely documented (for example, see the OSM report `Alluvial Valley Floor Identification and Study <br />Guidelines, " 1983). Some recorded sulfate values within the 2013 and 2014 data are higher than the <br />domestic drinking water standard (250 mg/1), especially at the downgradient wells. <br />It may be useful to analyze the data while accounting for seasonal fluctuations. Let me know if you have <br />any comments and/or questions (ext. 8113, rob zuber@state.co.us). <br />Sincerely, <br />Robert Zuber, P.E. <br />Environmental Protection Specialist <br />