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PART I <br />Page 11 <br />Permit No. COG-850000 <br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS <br />3. Monitoring Requirements <br />In order to obtain an indication of the probable compliance or <br />noncompliance with the effluent limitations specified in Part I.B.1, <br />the permittee shall monitor all effluent parameters at the following <br />frequencies. <br />a) Active Mining Outfall(s) <br />Effluent Parameter Measurement Freouency ~ Samnle Twe J <br /> <br />Flow, MGD Weekly Instantaneous <br /> or Continuous <br />pH, s.u. Weekly Grab <br />Oil and Grease, mg/1 Weekly Visual e/ <br />Total Suspended Solids, mg/1 Monthly Grab <br />Total Iron, mg/1 Monthly Crab <br />Settleable Solids, ml/1 g/ Monthly Grab <br />Total Dissolved Solids, mg/1 ~* Quarterly Grab <br />Total Phosphorus (as P), mg/1** Quarterly Grab <br />b) Post-Mining Outfall(s) <br />Effluent Parameter Measurement Frequency J Samnle T~ <br /> <br />Flow, MGD Monthly Instantaneous <br /> or Continuous <br />Settleable Solids, ml/1 g/ Monthly Grab <br />Oil and Grease, mg/1 Monthly Visual J <br />pH, s.u. Monthly Grab <br />Total Dissolved Solids, mg/1 J* Quarterly Grab <br />Total Phosphorus (as P), mg/1** Quarterly Grab <br />* Total Dissolved Solids (TDS) monitoring is required only for discharges co <br />the Colorado River Basin. See specific facility certification rationale <br />to determine whether TDS monitoring is required. <br />** Total phosphorus monitoring is required only Eor discharges to the Dillon <br />Reservoir drainage area (i.e., Ten Mile Creek, Snake River, Blue River, <br />and all other tributaries to the Dillon Reservoir) and for discharges co <br />the Upper Bear Creek drainage area. See specific facility certification <br />rationale to determine whether phosphorus monitoring is required. <br />See Part I.B.4. for footnotes <br />