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COLORADO DEPARTMENT OF HEALTH, Water Quality Conttol Division <br />Rationale - Page 11. Permit No. CO-0033367 <br />APPENDIX C <br />Mass balance equation for calculating WQS-based effluent limits <br />WQS CQ30-3 + Qeff) - (Q30-3 X Camb) <br />Ceff - <br />Qeff <br />Where: <br />Ceff Calculated effluent concentration <br />WQS Applicable water quality standard <br />Q30-3 'Receiving water 30-day, 3-year low flow (chronic - <br />empirically determined) (1.62 MGD) <br />For acute parameters (i.e., Total Residual Chlorine), the acute <br />low flow (3-day, 3-year) is used instead of the chronic. For the <br />Purgatoire, this flow is 0.646 MGD <br />• <br />Qeff Daily maximum effluent flow 004 - 0.06 MGD' <br />005 - 0.72 MGD <br />Camb Ambient instream concentration (Unknown - assume zero) <br />WQS: Fecal Coliform 2000 org/100 ml <br />Total Residual Chlorine 0.003 mg/1 <br />Total Recoverable Iron 4.0 mg/1 <br />Ceff Fecal Coliform 56,000 org/100 ml <br />Total Residual Chlorine 0.035 mg/1 <br />Total Recoverable Iron - 004 112 mg/1 <br />Total Recoverable Iron - 005 13 mg/1 <br />*The maximum effluent flow used is for the WWTF alone. If discharge occurs <br />from 004 based partly or wholly upon runoff, it will likely occur whe^ the <br />receiving waters are well above the low flow, thus allowing for additional <br />dilution of the effluent. <br />• <br />