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Mountain Coal and Beaz Coal Water Quality Assessment CO-0038776 and CO-0044377 <br /> Table A-10 <br />Acute Assimilative Capacities for Metals <br />Mountain Coal Outfalls 004 and 016 <br />Bear Coal Outfall 001 <br />Parameter Q t (4fs) ; Q a I'~ls) , Q 3" (cfs) -~ ~ z~I ~ = Mz ..y _ Notes <br />As, Trec (ugJl) 32 0.28 32.28 0 50 5,764 1 <br />Cd, Dis (ug/1) 32 0.28 32.28 0 1.8 208 2 <br />Cr+3, Trec (ug/1) 32 0.28 32.28 4.0 50 5,307 1 <br />Cu, Dis (ug/1) 32 0.28 32.28 0 7.3 842 2 <br />Pb, Dis (ug/1) 32 0.28 32.28 0.54 31 3,512 3 <br />Mn, Dis (ug/1) 32 0.28 32.28 4.2 2401 276,321 <br />Ni, Dis (ug/1) 32 0.28 32.28 0 269 31,012 4 <br />Se, Dis (ug/1) 32 0.28 32.28 0 18 2,075 <br />Ag, Dis (ug/1) 32 0.28 32.28 0 0.66 _ 76 4 <br />Zn, Dis (ug/1) 32 0.28 32.28 0 67 7,724 <br />Note 1: No current or historical ambient background data were available for total recoverable As or Cr+3. <br />were available and thus were used as the background concenha[ion. However, total As and total Cr data <br />- <br />Note 2: See Note 1 in Table A-9. <br />Note 3: See Note 2 in Table A-9. <br />Note 4: See Note 3 in Table A-9. <br />Because the low flow for Sylvester Gulch, West Sylvester Gulch, the Dry Fork ofMinnesota Creek <br />and Lone Pine Gulch is zero, the assimilative capacities aze equal to in-stream water quality <br />standards, respectively. These values, as shown in Tables A-3 and A-5, are: <br />• Total Recoverable Arsenic acute = 50 ug/1 <br />• Dissolved Cadmium acute = 19 ug/1 <br />• Dissolved Cadmium chronic = 6.2 ug/1 <br />• Total Recoverable Trivalent Chromium acute = 50 ug/1 <br />• Dissolved Copper acute = 50 ugn <br />• Dissolved Copper chronic = 29 ug/1 <br />• Dissolved Iron chronic = 300 ug/1 <br />• Total Recoverable Iron chronic = 1000 ugll <br />• Dissolved Manganese acute = 4738 ug/1 <br />• Dissolved Manganese chronic = 2618 ug/1 <br />• Total Mercury chronic = 0.01 ug/1 <br />• Dissolved Nickel acute = 1513 ug/1 <br />• Dissolved Nickel chronic = 168 ug/1 <br />• Dissolved Selenium acute = 18 ug/1 <br />• Dissolved Selenium chronic = 10.6 ug/1 <br />• Dissolved Silver acute = 22 ug/1 <br />• Dissolved Silver chronic = 3.5 ug/1 <br />Appendix A Page 17 of 20 Last Revised 3/9/2004 <br />