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PART I <br />Permit No. CO -0029599 <br />Page No. 7 <br />B. MONITORING REQUIREMENTS <br />1. Frequency and Sample Type (continued) <br />Oil and Grease, mg/f <br />Monthly Grab <br />Oil and Grease, mg/f <br />during limited access periods <br />Monthly <br />Visual <br />during normal access periods <br />Twice Monthly <br />Visual <br />pH, s.u. (Minimum -Maximum) <br />during limited access periods <br />Monthly <br />In -Situ <br />during normal access periods <br />Twice Monthly <br />In -Sim <br />Total Dissolved Solids, mg/1 <br />Quarterly <br />Grab <br />Whole Effluent Toxicity, Chronic <br />Ceriodaphnia sp. <br />Quarterly <br />3 Composites/Test <br />Fathead minnow <br />Semi -Annually " <br />3 Composites/Test <br />Cadmium, (PD), mg/9 <br />Monthly <br />Grab <br />Iron (PD), mg/1 <br />Monthly <br />Grab <br />Iron (TR), mg/C Monthly Grab <br />* First half semi-annual samples shall be collected during the period of April through June, the second half <br />semi-annual samples shall be collected during the period of October through December. <br />b. Outfall 005 <br />•-rcuawcwiax <br />Flow, MGD <br />Monthly <br />Instantaneous or Continuous <br />Settleable Solids, mZ/I <br />Monthly Grab <br />Oil and Grease, mg/f <br />Monthly Visual <br />pH, s.u. (Minimum -Maximum) <br />Monthly In -Sim <br />Total Dissolved Solids, mg/Z <br />Quarterly Grab <br />Self-monitoring sampling by the permittee for compliance with the monitoring requirements specified above shall be <br />performed at the following locations: outfalls 001 and 005 - at the respective final settling pond outfalls prior to <br />entering the immediate receiving waters, North Thompson Creek. <br />If the permittee, using the approved analytical methods, monitors any parameter more frequently than required by <br />this permit, then the results of such monitoring shall be included in the calculation and reporting of the values <br />required in the Discharge Monitoring Report Form (DMRs) or other forms as required by the Division. Such <br />increased frequency shall also be indicated. <br />c. Oil and Grease Monitoring <br />For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab <br />sample shall be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall <br />be taken immediately to mitigate the discharge of oil and grease. A description of the corrective action taken <br />should be included with the DMR. <br />See Part I.C. for Derm itions. <br />0 <br />