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Mountain Coal and Beaz Coal Water Quality Assessment CO-0038776 and CO-0044377 • Table A-9 Chronic Assimilative Capacities for Metals Mountain Coal Outfalls 004 and 016 Bear Coal Outfa11001 Parameter • Q p {cfs} ° Q~={efs}e "Q'~ -(cfa} `M`~ ,'~ • • M t `-MZ ~_' Notes '_ _. , Cd, Dis (ug/1) 43 0.28 43.28 0 1.4 216 1 Cu, Dis (ug/1) 43 0.28 43.28 0 5.1 788 1 Fe, Dis (ug/1) 43 0.28 43.28 72 300 35,314 Fe, Trec (ug/1) 43 0.28 43.28 280 1000 111,571 2 Pb, Dis (ug/1) 43 0.28 43.28 0.54 1.2 I03 2 Mn, Dis (ug/1) 43 0.28 43.28 4.2 50 7,084 Hg, Tot ug/1) 43 0.28 43.28 0 0.010 1.5 1 Ni, Dis (ug/1) 43 0.28 43.28 0 30 4,637 3 Se, Dis (ug/1) 43 0.28 43.28 0 4.6 Ill Ag, Dis (ug/1) 43 0.28 43.28 0 0.024 3.7 3 Zn, Dis (ug/1) 43 0.28 43.28 0 68 IO,SII Note I: Data for dissolved Cd, dissolved Cu, and total Hg were found at less than detection levels, but the detectlon levels were greater than in- streamwater quality standards. When sample results aze non-detect, the value of zero is used in accordance with the WQCD's standard approach for sua>mariiation and averaging. thus, a background concentration of zero was assumed [o de[eanine assimilative capacities. , . Note 2: No current data were available for dissolved Pb or total recoverable Fe. However, data for total Pb and total Fe were available and thus were used as the respective background concentration. - ~ ~. ~ Note 3: Ctiment data for dissolved Ni and Ag were unavailable. Eae 5ndings of comparable studies suggest that dissolved Ni and Ag have been removed from the list of pollutants of concern for a waterbody when in-stream samples are found at less than detection levels or at extremely ]ow concentralions. Whett sample results aze found at less than detection levelt, the value of zero is used in accordance with the WQGD's standazd approach for sumuraiization and averaging. 1Lus, a background concentration of zero was used based on historical data. Appendix A Page 16 of 20 Last Revised 3/9/2004