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RAG Empire Corporation, Eagle Mine Water Quality Assessment CO-0034142 <br />Total Recoverable Iron and Dissolved Zinc: Metals occur naturally in rock. Earth disturbances, <br />such as mining operations, expose rock to air and water creating a potential for these substances to be <br />present in elevated concentrations. <br />Using the mass-balance equation provided in the beginning of Section N, the acute and chronic low <br />flows set out in Section III, the ambient background concentrations shown in Section II, and the in- <br />stream standards shown in Section II, assimilative capacities were calculated. Because of the <br />proximity of the outfalls, the effluent flow, Qz, was set equal to the combined .design flow of 4.03 <br />MGD (6.2 cfs) from Outfalls 003, 022, and 024 which represent the outfalls that dischazge mining <br />related waters. The data used and- the resulting calculations of the allowable' dischazge <br />concentrations, M2, aze set forth as follows: <br />• Table A-7 for chronic assimilative capacities based on current'FVS standards <br />• Table A-8 for acute assimilative capacities based on current TVS standazds. <br />• Table A-9 for cltronic assimilative capacities based on future TVS standards <br />Table A-10 for acute assimilative capacities based on future TVS standazds. <br />Table A-7 <br />Chronic Assimilative Capacities for Metals <br />Based on Current TVS Standards <br />Fe, Trec <br />Table A-8 <br />Acute Assimilative Capacities for Metals <br />Based on Current <br />Dis <br />21 <br />Table A-9 <br />Chronic Assimilative Capacities for Metals <br />Based on Future TVS Standards ~' <br />Appendix A Page 11 of 13 <br />t <br />C1 <br />r <br />