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• COLORADO DEPARTMENT OF HEALTH <br />Water Quality Control Division <br />Rationale - Page 10 <br />Permit No. CO -0034142 <br />EFFLUENT LIMITATIONS, RATIONALE AND MONITORING FREQUENCY: <br />Effluent limitations were selected as being the most stringent of those shown <br />on preceding pages. Tables 4, 5 and 6 below show the limitations wnicn were <br />chosen. <br />TABLE 4 <br />(Outfalls 004, OOo, 007, 009, 011 - 021) <br />Monitoring <br />Parameter Limitation Rationale Frequency <br />Flow, MGD <br />NA <br />Monitoring <br />Monthly <br />pH, S.U. <br />6.5 - 9.0 <br />WQS <br />Monthly <br />Oil & Grease, mg/l <br />10.0 <br />SES <br />Moutuly <br />Settleable Solids, ml/1* <br />0.5 <br />BAT <br />Monthly <br />Salinity <br />NA <br />Monitoring <br />Quarterly <br />• *This parameter is not applicable <br />to discharges <br />caused by precipitation <br />greater than the 10 -year, 24-hour <br />event (or equivalent snowmelt volume). <br />TABLE 5 <br />(Outfalls 002, 003, <br />022) <br />Monitoring <br />Parameter <br />Limitation <br />Rationale <br />Frequency <br />Flow, gpm <br />3112 1/ <br />Maintain WQS <br />Weekly <br />PH, S.U. <br />b.5-9.0 <br />WQS <br />Weekly <br />Oil & Grease, mg/1 <br />10 <br />SES <br />WeeKly <br />Total Suspended Solids, mg/l <br />35/70 2/ <br />BPT <br />Twice <br />Monthly <br />Total Recoverable Iron, mg/l <br />1.0/2.0 2/ <br />WQS <br />Monthly <br />Total Recoverable Zinc, mg/l <br />0.16/0.36 L/ <br />WQS <br />Twice <br />Monthly <br />Salinity <br />NA <br />Monitoring <br />Quarterly <br />1/ 'Tnis limitation applies to tue total flow from 002, OU3 and 022 <br />2/ 30 -day average/daily maximum <br />• <br />