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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 15. Permit No. CO-0042161 <br />APPENDIX C <br />Mass balance equation for calculating WQS-based effluent limits <br />WQS (30E3 + Qeff) - (30E3 X Camb) <br />Ceff ° <br />Qeff <br />Where: <br />Ceff <br />WQS <br />30E3 <br />Qeff <br />Camb <br />Parameter <br />= Calculated effluent concentration <br />= Applicable water quality standard (see Appendix A) <br />= Receiving water 30-day, 3-year low flow (chronic - <br />empirically determined) (0.45 MGD) <br />= Daily maximum effluent flow (1.44 MGD) <br />= Ambient instream concentration (unknown - assume zero) <br />WQS-based <br />Limi t <br />Nitrite as N, mg/1 0.081 <br />Silver, mg/1 0.00016 <br />Manganese, mg/1 1.625 <br />Iron, mg/1 1.625 <br />Sample <br />Result <br />0.06 <br />0.0001 <br />0.09 (before treatment) <br />0.03 (after treatment) <br />• <br />r1 <br />L~ <br />• <br />