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PART I Page No. 7 Permit No. CO-0045080 ~. MONITORING REQUIItEMENfS 1. In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Pan I.A.1, the permittee shall monitor all effluent pazameters at the following frequencies. Such monitoring will begin immediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be repotted on the Discharge Monitoring Report form (See Pan I.E.). a. Outfallc_ OOI. 002. 003. 005. 006. 007. 008. 009. 010. 012 Effluent Parameter Measurement Frequencv Sample Tvoe Flow, MGD Weekly Instan[aneous or Continuous Total Suspended Solids, mg/¢ Monthly Grab Total Iron, mg/¢ Montlily Grab Settleable Solids, m¢/¢ Monthly Grab Oil and Grease, mg/¢ Weekly Visual pH, s.u. Weekly In-sim b. Outfalls 004. 011 and Ol3 Effluent Parameter Mea<urement Frequencv Sample Tvoe Flow, MGD Weekly Instantaneous or Continuous Total Suspended Solids, mg/¢ Monthly Grab • Total Iron, mg/¢ Mondtly Grab Oil and Grease, mg/¢ Weekly Visual pH, s.u. Weekly In-sim Whole Effluen[ Toxicity, Acute Quarterly Grab Self-monitoring sampling by the permittee for compliance with the monitoring requirements specified above shall be performed at the following locations: at outfalls 001 through 013, the outfalls from the sedimentation ponds, as shown in Figures 2 through 5, prior to entering the immediate receiving waters. If the permittee, using the approved analytical methods, monitors any pazameter more frequently than required by this permit, then the results of such monitoring shall be included in the calculation and reporting of the values required in the Dischazge Monitoring Report Form (DMRs) or other fortes as requ'ved by the Division. Such increased frequency shall also be indicated. c. Gil and Grease Monitories For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately to mitigate the dischazge of oil and grease. A description of the corrective action taken should be included with the DMR. C. DEFINITIONS OF TERMS 1. 'Acute Toxicity" means there shall be no acute toxicity in the effluent from this dischazge point. The acute toxicity limitation is exceeded if 1) a statistically significant difference in mortality (at the 9590 confidence level) is observed for either species between the control and any dilution less that or equal to the identified IWC or 2) a species monaliry in any • dilution of effluent (including I00% effluent) exceeds 5090. 2. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proponioned according to flow. 3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides measurements.