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Pittsburg and Midway Coal Company Edna Mine Water Quality Assessment CO-0032638 <br />Table A-6 <br />Chronic Assimilative Ca acities for Metals at Outfall 007 <br />Parameeer; '_ . ~": .Q~_~4/5~, Qa,(~.ISI-t Qa :(crs) ~, sYlr. °;M .Mz .... Noites <br />As, TR (u 1) 0.25 4.0 4.25 1.0 100 106 1 <br />Cd, Dis (ug/]) 0.25 4.0 4.25 0 6.2 6.6 <br />Cr+3, Dis (ug/I) 0.25 4.0 4.25 26 231 244 2 <br />Cu, Dis (ug/1) 0.25 4.0 4.25 8.5 29 30 <br />Fe, TR (ug/1) 0.25 4.0 4.25 130 1000 1,054 <br />Pb, Dis (u 1) 0.25 4.0 4.25 0 11 12 <br />Mn, Dis (ug/1) 0.25 4.0 4.25 13 2618 2,781 <br />H ,Tot (ug/1) 0.25 4.0 4.25 0 0.010 0.011 <br />Ni, Dis (ug/1) 0.25 4.0 4.25 0 168 179 <br />Se, Dis (ug/1) 0.25 4.0 4.25 1.1 4.6 4.8 <br />Ag, Dis (u 1) 0.25 4.0 4.25 0 0.81 0.86 3 <br />Zn, Dis (ug/1) 0.25 4.0 4.25 18 382 405 <br />Note I: No ambient background data were available in the form of total recoverable As. Dissolved arsenic data, however, were available and <br />were used as [he background concentration. <br />Note 2: No current or historical ambient data were available in the dissolved or total recoverable form of Cr*3. However, total Cr data <br />(representing a combination of the Cr+3 and Cr+6 valences and dissolved and total recoverable fortnS) were available from USGS station <br />09244464. For a conservative estimate, the total Cr data from this station were used as a comparable background concentration for both the <br />dissolved and total recoverable Cr+3 forth of chromium. <br />Note 3: No current data were available for dissolved Ag and no historical data were found a[ upstream or downstream sampling locations. <br />However, data for total recoverable Ag were found at less than detection levels based on 2 samples collected during 1986 from Rock Creek near <br />Toponas, C'O. When sample results are found at less than detection levels, [he value of zero is used in accordance with the Division's standard <br />approach for summarization and averaging. Thus, a background concentration of zero was used based on historical data. <br />Appendix A ~wQA ev vers;on 4-s rAel.> Page 12 of 19 Last Revised September 2, 2005 <br />