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?ART~I <br />Page 11 <br />Perm c No. COG-850000 <br />B. EFFLUENT LIMITATIONS AND MONITORING REOUIREPSENTS <br />3. Monitorine Requirements <br />In order to obtain an indication of the probable co~piiance or <br />noncompliance with the effluent limitations speci=i d in Pazt i.3.'., <br />the permittee shall monitor all effluent parameters ac the following <br />frequencies. <br />a) Active Mining Out£all(s) <br />Effluent Parameter Measurement Freauencv ~ Samole T••^~e dj <br />Flow, MGD Weekly Instantaneous <br /> or Continuous <br />pH, s.u. Weekly Grab <br />Oil and Grease, mg/1 Weekly `usual ~~ <br />Total Suspended Solids, mg/1 Monthly Grab <br />Total Iron, mg/1 Monthly Grab <br />Settleable Solids, ml/1 g/ Monthly Grab <br />Total Dissolved Solids, mg/1 J* Quarterly Grab <br />Total Phosphorus (as P), mg/1** Quarterly Grab <br />b) Post-!fining Outfall(s) <br />Effluent Parameter Measurement Freauencv ~ Samnle Twe <br />Flow, MGD Monthly Instantaneous <br /> or Continuous <br />Settleable Solids, ml/1 g/ Monthly Grab <br />Oil and Grease, mg/1 Monthly Visual <br />pH, s.u. Monthly Grab <br />Total Dissolved Solids, mg/1 J* Quarterly Grab <br />T_ocal Phosphorus (as P), mg/1** Quarterly Grab <br />* Total Dissolved Solids (TDS) monitoring is required on ly for discharges co <br />the Colorado River Basin. See specific facility certi ication rationale <br />to determine whether TDS monito ring is required. f <br />** <br />Total phosahorus monitoring is required only for discharges to the Dillon <br />Reservoir drainage area (i.e., Ten Nile Creek, Snake river, 31ue River, <br />and all other tributaries co the Dillon Reservoir) andfor discharges [o <br />the Upper Sear Creek drainage Brea. See specific facility certification <br />rationale to determine whether phosahorus monitoring is required. <br />See Part I.B.4, for footnotes <br />