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COLORADO DEPARTMEN~F HEALTH, <br />Permit Numbet CO-0032751 Page <br />Water Quality Contro~D iv ision <br />6 . <br />APPENDIX C <br />Mace Balance Equation for Calculating WQS-Based Effluent Limits <br />M2 <br />Whore: <br />M3(Q1 + 42) - M1Q1 <br />Q2 <br />Ql =Upstream low flow see monthly values indicated under "Stream <br />Low Flow" on page 2 of rationale <br />Q2 =Seasonal effluent maximum flows from Croee Mine and Caribou <br />Mine = see discussion of "Total Flow" on page 14 of rationale <br />Ml =Ambient instream concentration = 0.0 mq/1 assumed mean <br />concentration in Coon Track Creek above the Caribou Mine <br />discharge <br />M2 =Calculated effluent concentration Unknown <br />M3 =Applicable water quality standard; see Appendix A <br />Refer to the following computer printout for the calculated water quality <br />standard limitations for the applicable metal parameters. <br />For Potentially Dissolved Zino in the computer printout, the present permit <br />limits are based upon the indicated "Old Zinc" standard, which is the wQ5 that <br />ie presently applicable for this parameter. The indicated "New Zinc" <br />standard ie the WQS that will be based upon a proposed revised calculation <br />equation for determining this standard. At this time the "New Zinc" standard <br />hoe not yet been adopted for the South Platte River Basin. Once the revised <br />calculation for the new zinc standard has become effective, the permittee may <br />request an amendment to revise the zinc permit limits based upon the revised <br />calculation. <br />