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<br />COLORAllO DEPARTMENT OF HEALTH <br />Water Quality Control Division <br />Rationale - Page 3 <br />Permit No. CO-003.1653 <br /> <br />Federal BPT and BAT recently promulgated specify the following effluent <br />limitations for reclamation areas: (this applies co outfalls 002, 003, U04 <br />and 001). <br />TABLE 2 <br />Parameter BPT SAT <br />pH, s.u. 6.0 [0 9.0 NA <br />Settleable Solids, ml/1* 0,5 0.5 <br />•This parameter does nat apply to .discharges caused by precipitation greater <br />than the 10-year, 24-hour event (or equivalent saovmelt volume). <br />State Effluent Standards (SES) dictate the imposition of an 011 and Grease <br />limitation of 10.0 mg/1 for all discharges not o[herrise limited. <br />Additionally, State Water Quality Standards (WQS) dictate a pH limitation of <br />6.5 to 9.0 s.u.. This supersedes the BPT limitation for pH shown in Table 1. <br />Because discharge will be intermittent and will normally occur only during <br />precipitation events (periods rhea receiving rater floes will be high) no <br />rater quality standard-based effluent limitations are appropriate other than <br />pH. <br />EFFLUENT LSMITATIONS, RATIONALE AND MONITORSNC FREQUENCIES: <br />Table 3 below denotes effluent limitations for outfall 001 and the <br />rationale which determined the limitations. <br />Table 3 <br />Monitoring <br />Parameter Limitation Rationale Frequency <br />pH, s.u. <br />011 and Crease, mg/1 <br />Total Suspended Solids, mg/1 <br />Total Iron, mg/1 <br />Settleable Solids, ml/1 <br />Flow, MGD <br />Salinity <br />6.5-9.0 e/ <br />10.0 e/ <br />35/70 f/ <br />3.5/7.0 f/ <br />0. S y,/ <br />Monitoring only <br />Monitoring only <br />WQS Weekly <br />SES Weekly <br />BPT Monthly <br />BAT Monthly <br />BA'I Weekly <br />N/A Weekly <br />N/A Quarterly h/ <br />