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COLORADO DEPART~NT OF HEALTH, Water Quality Control Division <br />Rationale -Page 11. Permit No. CO-0000213 <br />APPENDIX A <br />Mass balance equation for calculating WQS-based effluent limits <br />WQS (30E3 + Qeff) - (Cymb X 30E3) <br />Ceff ' <br />Qeff <br />Where: <br />Ceff Calculated effluent concentration, mg/1 <br />WQS Applicable water quality standard for segment 5, mg/1 <br />= 1.0 mg/1 for Total Recoverable Iron <br />1.0 mg/1 for Total Recoverable Manganese <br /> <br />30E3 = Receiving water 30-day, 3-year low flow (chronic - <br />emplrically determined) 8.5 cfs <br />Qeff Daily maximum effluent flow 1.14 cfs <br />Cab Ambient instream concentration, mg/1 <br />= 0.26 mg/1 for Total Recoverable Iron <br />= 0.34 mg/1 for Total Recoverable Manganese <br />(both of these values based on the permittee's data far <br />Upper Tuttle Draw submitted with the permit renewal <br />application ) <br />Below is the 30-day average limit calculation for the applicable metal <br />parameters. <br />Total Recoverable Iron <br />Ceff 1.0 (S.5 + 1.14) - 0.26 (8.5) 6.5 mg/1 (Total <br />1.14 Recoverable Iron) <br />Total Recoverable Manganese <br />Ceff 1.0 (8.5 + 1.14) - 0.34 (8.5) = 5.9 mg/1 (Total <br />1.14 Recoverable Zinc) <br /> <br />