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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 Outfall 001 Parameter - Q~i ~efs~ .Q2.1'efs~"~i ~Q3 ~r,~&~ ',M1,- ~3. ~~ NateS _.. 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 (u I) 43 0.28 43.28 280 1000 111,571 2 Pb, Dis (ug/1) 43 0.28 43.28 0.54 1.2 103 2 Mn, Dis (ug/1) 43 0.28 43.28 4.2 50 7,084 Hg, Tot (u I) 43 0.28 43.28 0 0.010 l.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 4.6 711 Ag, Dis (ug/I) 43 0.28 43.28 0 0.024 3.7 3 Zn, Dis (ug/1) 43 0.28 43.28 0 68 10,511 Note 1: Data for dissolved Cd, dissolved Cu, and total Hg were found at less tfian detection levels, but the detection levels were greater than in- streamwater quality standards. When sample results aze nondetect, the value of zero is used in accordance with the WQCD's standard approach for sutmmarizatioa and averaging. Thus, a background coacentntion of zero was assumed to determine assirrihttive capacities. Note 2: No curent 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. - ~. .. ~ Ni and Ag Lave been Note 3: Curren[ data for dissolved Ni and Ag were unavailable. The 5ndings of comparable sNdies suggest that dissolved removed from Ibe list of pollutants of concern for a waterbody when in-stream samples are found at less than detection levels or at extremely low concentrations. When sample results are found at less than detection levels, the value of zero is used in accordance with the WQCD's standard approach for sammari~ation and avenging. Thus, a background concentration of zero was used based on historical data. Appendix A Page 16 of 20 Last Revised 3/9/2004