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9 <br />C <br /> <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 3. Permit No. CO-0039560 <br />APPLICABLE RULES AND REGULATIONS: <br />Table 1 below, shows State Effluent Standards (SES), Federal Best Practicable <br />Control Technology (BPT), Federal Best Available Technology Economically <br />Achievable (BAT) and State Water Quality Standards (WQS) applicable to this <br />facility. <br />Table 1 <br />Parameter SES WQS BPT BAT <br />pH, s.u. a/ 6.0 - 9.0 6.5 - 9,0 6.0 - 9.0 N/A <br />031 and Grease, mg/1 a/ 10 N/A N/A N/A <br />Total Suspended Solids, mg/1 30/45 d/ N/A 35/70 b/ N/A <br />Total Iron, mg/1 N/A N/A 3.5/7.0 b/ 3.5/7.0 <br />Settleable Solids, ml/1 c/ N/A N/A N/A 0.5 <br />a/ This parameter applicable at all times. <br />b/ This limitation applicable to discharges during periods of no precipitation <br />c/ This parameter applicable to discharges during periods of precipitation <br />less than or equal to the 10-year, 24-hour event for this facility <br />d/ This limitation does not apply pursuant to Section 10.1.3(3) of the State <br />Regulations for Effluent Limitations. <br />EFFLUENT LIMITATIONS, RATIONALE AND MONITORING FREQUENCIES <br />Table 2 <br />Monitoring <br />Parameter Limitation Rationale Frequency <br />pH, s.u. 6.5 - 9.0 e/ WQS Weekly <br />Oil and Grease, mg/1 10 e/ SES Weekly <br />Total Suspended <br />Solids, mg/7. 35/70 f/ BPT Monthly <br />Total Iron, mg/1 3.5/7.0 f/ BAT Monthly <br />Settleable Solids, ml/1 0.5 g/ BAT Monthly <br />Flow, MGD Monitor Only N/A Weekly <br />e/ This limitation shall apply at all times. <br />f/ This limitation shall apply to discharges during periods of no <br />precipitation and may apply to discharges during periods of precipitation. <br />g/ This limitation may apply to discharges during periods of precipitation <br />less than or equal to the 10-year, 24-hour event for this facility. <br />