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Mountain Coal and Beaz Coal Water Quality Assessment CO-0038776 and CO-0044377 <br />Hardness data for the various receiving streams neaz the point of dischazge of the Mountain Coal <br />W WTFs and the Beaz Coal W WTFs were insufficient to conduct a regression analysis based on the <br />low flow. Therefore, the WQCD's alternative approach to calculating hardness was used, which <br />involves computing a mean hazdness. <br />The mean hazdness for stream segment COGL1NF02 was computed to be 52 mg/1 based on sampling <br />data provided by the permittee for the North Fork of the Gunnison River downstream of the West <br />Elk Mine. Data from this location were available for a period of record from Apri12002 through <br />September 2002. This hazdness value and the formulas contained in the TVS were used to calculate <br />the in-stream water quality standards for metals with the results shown in Table A-4. <br />Appendix A Page 6 of 20 Last Revised 3/9/2004 <br />