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Pittsburg and Midway Coal Company Edna Mine Water Quality Assessment CO-0032638 <br />Table A-5 <br />Chronic and Acute Assimilative Ca acities for Metals at Outfa11004 <br />Parameter ' <br />~ °',Ghronce,Assimitatave Capacities : ° ;. Acute Assimilative-Capacities : ' <br />~ <br />As, TR (ug/1) 100 50 (Jun-Feb) <br />Cd, Dis (ug/1) 6.2 17 <br />Cr+3, Dis (ug/1) 231 1773 <br />Cr+3, TR (ug/1), NA 50 (Jun-Feb) <br />Cu, Dis (ug/]) 29 50 <br />Fe, TR (ug/1) 1,000 NA <br />Pb, Dis (ug/1) 11 281 <br />Mn, Dis (ug/1) 2,618 4738 <br />Hg, Tot ug/I) 0.010 NA <br />Ni, Dis (ug/1) 168 1513 <br />Se, Dis (ug/1) 4.6 18 <br />Ag, Dis (ug/1) 0.81 22 <br />Zn, Dis (ug/1) 382 379 <br />For Outfal] 007, the mass-balance equation provided in the beginning of Section IV, the low flows <br />provided in Section III, the background concentrations contained in Section II, and the in-stream <br />standards for metals shown in Section fl, assimilative capacities were calculated. The data used and <br />the resulting calculations ofthe allowable dischazge concentrations, Mz, are set forth in Table A-6 for <br />chronic assimilative capacities and in Table A-7 for acute assimilative capacities. <br />Appendix A iwQn sr version a-s Fne~> Page 11 of 19 Last Revised September 2, 2005 <br />