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Mountain Coal and Bear 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 V alue Standards Contained in the Colorado Department of Public Health <br />and Environment Water Quality Control Commission Re lation 35 <br />Calculated Using the Followin g Value for Hardness as CaC03: 52 n3g/1 <br />t In-Str eam <br />~Watex <br />. . <br />Parameter <br />;Qualit , <br />, <br />y Standard Formula IJseil <br /> TIUUt 1.8 "G'• [1.13667-0.041841n(hardness)][e(1.128(In(hardness))-3.828)] <br />Cadmium, Dissolved <br />ChrOmC <br />1.4~ <br />ug/1 (0.7852(ln(hardness))-2.715)] <br />[1.10167-0.041841n(harMess)][e <br />Hexavalent Chromium, ACllte 16 ~ llg/1 Numeric standards provided, formula not applicable <br />Dissolved Chroic 11 I UgQ Numeric standards provided, formula not applicable <br /> ACUte 7.3 llg/1 a (0.9422(ln(hardness))-1.7408) <br />Copper, Dissolved <br />Chronic <br />5.1 <br />ug/1 (0.8645(ln(hardness))-1.7428) <br />e <br /> Aente 31 ~'1 [1.46203-0.1457121n (hardness)][e (1.273(ln(hardness))-1.46)] <br />Lead, Dissolved <br />ChIOll1C <br />1.2 ~ <br />llgJl (1.273(In(hardness))-4.705)] <br />[1.46203-0.1457121n(hardness)][e <br />Manganese Acute 2401 u~ e (0.3331(In(hardness))+6.4676) <br /> Acute 269 Ug/1 a (0.846(ln (hardness))+2.253) <br />Nickel, Dissolved Chronic 30 u e ro.&a6(ln(hardness)>+o.ossa) <br /> ACUte 18 (Ug/1 Numeric standards provided, formula not applicable <br />Selenitun, Dissolved <br /> ChIOIllC 4.6 ~ugfl Numeric standards provided, formula not applicable <br /> ACllte 0.66 ug/1 ~1 e (].72(ln(hardness))-6.52) <br />S11ver, Dissolved <br />t <br />T <br />0 <br />024 <br />~ <br />/1 (1.72(In (hardness))-10.51) <br /> rou . ug e <br /> Aerate 67 llg/1 a (0.8473(]n{hardness))+0.8618) <br />L.1nC, Dissolved ChtOIllC 68 ~'• e(0.8473(]n(hardness))+0.8699) <br />In the absence of available data downstream of discharge locations, the mean hardness for stream <br />segment COGUNF06 (including Sylvester Gulch, West Sylvester Gulch, the DryFork of Minnesota <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 of the Gunnison and Lower Dolores River <br />Basins, which determined this hardness for stream segment COGUNF06 using compazable <br />watersheds. This hazdness value and the formulas contained in the TV S were used to calculate the <br />in-stream water quality standards for metals with the results shown in Table A-5. <br />Appendix A Page 7 of 20 Last Revised 3/9/2004 <br />