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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 4. Permit No. CO-0042161 <br />LIMITATIONS AND RATIONALE: (Cont.) <br />Discharge point 001 <br />Parameter <br />Flow, MCD <br />pH, s.u. <br />Oil and Grease, mg/1 <br />TSS, mg/1 <br />Total Recoverable Iron, mg/1 <br />Dissolved Aluminum, mg/1 <br />TDS, mg/1 <br />Biomonitoring <br />Table 2 <br />Final Limitations <br />Limitation <br />Rationale <br />Monitoring <br />Frequency <br />Report a/ <br />6.5-9.0 b/ <br />10 c/ <br />35/70 d/ <br />0.066 a/ <br />Report c/ e/ <br />Report c/ <br />NA <br />WQS <br />SES <br />NSPS <br />Antidegradation <br />NA <br />Colo. Salinity <br />Regs <br />See Discussion <br />Weekly <br />Weekly <br />Weekly <br />Monthly <br />Monthly <br />Monthly <br />Quarterly <br />Quarterly <br />a/ 30 day average <br />b/ Allowable range <br />. c/ Daily maximum <br />d/ 30 day average/Daily maximum <br />e/ Monitoring required only if chemical treatment, using a compound containing <br />aluminum, is applied <br />DISCUSSION: <br />A. Flow <br />None of the permit limits are flow-based, therefore no flow limits are <br />needed in the permit at this time. <br />B. pH, Oil and Grease <br />The WQS for pH are stricter than the SES, and are therefore used. The oil <br />and grease limits are based on the SES. <br />C. Total Suspended Solids <br />The State Effluent Limitation Regulations dictate that where Federal <br />Effluent Guidelines exist they shall take precedence over SES. This is <br />the reason for selection of NSPS-based TSS limitations, even though the <br />SES limits are stricter. <br />D. Salinity (Total Dissolved Solids) <br />. Regulation 3.10.0, "Regulations for Implementation of the Colorado River <br />Salinity Standards Through the NPDES Permit Program," addresses the <br />discharge of salinity to the Colorado River Basin. It is a requirement of <br />the regulation that the salinity level of each discharge in the Colorado <br />