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<br /> <br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 5. Permit No. CO-0032638 <br />APPLICABLE RULES AND REGULATIONS: (CONTINUEll) <br />A six-time analysis at a lower detection limit will be required for mercury, <br />cadmium and silver. These analyses may indicate no concern, but if problems <br />are identified, limitations will be necessary. <br />Total suspended solids limitations are based on state effluent standards. For <br />outfall 003, TSS limitations may "drop out" when discharges are caused by <br />precipitation. Outfall 006 is the discharge from a spoils spring and no[ <br />directly precipitation-related. Thus, all parameters including TSS, apply at <br />all times at this outfall. <br />EFFLUE1dT LIAIITATIONS, RATIONALE, AND MONITORING REQUIREPIENTS: <br />Outfalls 001, 002, 004, and 005 <br />Table 5 shows effluent limitations and the rationale for their choice. <br />Paramatar <br />pH (s.u.) <br />Oil and Grease (mg/1) <br />Total Suspended Solids (mg/1) <br />Total Iron (mg/1) <br />Settleable Solids (ml/1) <br />Flow (MCD) <br />Salinity <br />Footnotes: See page 7. <br />Table 5 <br /> Monitoring <br />Limitation Rationale Frequency <br />6.5-9.0 a/ WQS Weekly <br />10.0 a/ SES Weekly <br />35/70 b/ BPT Monthly <br />3.5/7.0 b/ BAT Monthly <br />0.5 c/ BAT Monthly <br />Monitor Only N/A Weekly <br />Monitor Only N/A Quarterly d/ <br /> <br />