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~i <br />Blue Mountain Energy, Inc. WWTP Waier Quality Assessment CO-0038024 <br />• <br />The mean hazdness was computed to be 2i4 mg/I based on sampling data from USGS Station <br />09306290, located on the White River belotiv Boise Creek, approximately 7 miles upstream of the <br />confluence of Red Wash and Scullion Gulch with Kenney Reservoir. These datawere available for a <br />period of record from 1990 to 1999. It should be noted that data from this location included <br />dissolved calcium and dissolved magnesium analytical results and these were used to calculate the <br />hazdness concentration, absent hardness data. Specifically, the WQCD uses the calcium and <br />magnesium concentrations to calculate hardness based on the following equation: <br />• Appendix A Page 5 of 15 <br />Hazdness data for the White River neaz [he point of confluence with Red Wash and Scullion Gulch <br />were insufficient to conduct a regression analysis based on the low flow. Therefore, the WQCD's <br />alternative approach to calculating hazdness was used, which involves computing a mean hazdness. <br />