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Mountain Coal and Beaz Coal Water Quality Assessment CO-0038776 and CO-0044377 <br />Table A-4 <br />TVS-Based Metals Water Quality Standards for the North Fork of the Gunnison River <br />Based on the Table Value Standazds Contained in the Colorado Department of Public Health <br />and Environment Water Quality Control Commission Regulation 35 <br />Calculated Using the Following Value for Hardness as CaCO3: 52 n3g/1 <br />Cadmium, Dissolved <br />Hexavalent Chromium, <br />Dissolved <br />Copper, Dissalved <br />Lead, Dissolved <br />Manganese <br />Nickel, Dissolved <br />Selennsm Dissolved <br />S11ver, Dissolved <br />Zinc. Dissolved <br />Acute <br />Acute <br />Acute 18 <br />Chronic 4.6 <br />Acute 0.66 <br />Trout 0.024 <br />Acute 67 <br />Chronic 68 <br />1.8 <br />1.4 <br />16 <br />11 <br />73 <br />5.1 <br />31 <br />1.2 <br />2401 <br />269 <br />[1.13667-0.041641n(ha <br />[ 1.10167-0.041841n(har <br />Numeric standards <br />Numeric standards <br />e (0.942 <br />e (o.esa <br />[ 1.46203-0.1457121n (h <br />[1.46203-0.1457121n(ha <br />formula not <br />formula not <br />tens))-1.7428) <br />(1.273 (ln(hardness))-1.46)] <br />e <br />(1.273(In(hardness))-4.705)] <br />e (0.3331(ln(hardness))+6.4676) <br />e (0.846(ln (hardness))+2.253) <br />~~ ~ e (0.846(ln(hardness))+0.0534) <br />Numeric standards providcd, formula not applicable <br />Numeric standards provided, formula not applicable <br />~z e (1.72(ln(hardness))-6.52) <br />e (1.72(In (hardness))-10.51) <br />e (0.8473(ln(hardness))+0.8618) <br />e (0.8473()n (hardness))+0.8699) <br />(1.126(In(hardness))-3.82 <br />(0.7 8 52 (ln (hardness))-2.7'. <br />In the absence of available data downstream of dischazge locations, the mean hardness for stream <br />segment COGUNF06 (including Sylvester Gulch, West Sylvester Gulch, the Dry Fork ofMinnesota <br />Creek, and Lone Pine Gulch) was determined to be 400 mg/1 based on the Rationale for <br />Classifications, Standards and Designations of Segments ofthe Gunnison and LowerpoloresRiver <br />Basins, which determined this hardness for stream segment COGUNF06 using comparable <br />watersheds. This hardness value and the formulas contained in the TV S were used to calculate the <br />in-stream water quality standazds for metals with the results shown in Table A-5. <br />Appendix A Page 7 of 20 Last Revised 3/9/2004 <br />