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PART I Page No. 8 Permit No. CO-OOOOl32 B. MONITORING REQUIREMENTS 1. Freauencv and Sample Tvoe In order to obtain an indication of the probable compliance or nonwmpliance 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 Dischazge Monitoring Report farm (See Part I.E.1.). (a) Ou_tfalls 007, 009, 010, 012, 013 and 014 Effluent Parameter Measurement Freauenc Flow, MGD Monthly Total Suspended Solids, mg/P Monthly Total Iron, mg/P Monthly Settleable Solids, mP/P Monthly Oil and Grease, mg/Q Monthly pH, s.u. Monthly Total Dissolved Solids, mg/P Quarterly (b) Outfa11011 Effluent Parameter Measurement Freauenc Flow, MGD Weekly • Total Suspended Solids, mg/P Monthly Total Iron, mg/P Monthly Oil and Grease, mglP Weekly pH, s.u. Weekly Total Dissolved Solids, mgJP Quarterly Whole Effluent Toxici[y, Acute Quarterly Sample Tvoe Instantaneous or Continuous Grab Grab Grab Visual-See Part I.B.1.(c) In-situ Grab Sample Tvoe Instantaneous or Continuous Grab Grab Visual-See Pan I.B.1.(c) In-situ Grab Grab Self-monitoring sampling by the pettttittce for compliance with the monitoring requirements specified above shall be performed at the following locatioms: surface runoff outfalls -007, prior to entering Hubbard Creek; 009, 013 and O14, prior to entering the Notch Fork of the Gunnison River; 010, prior to entering Sanbom Creek; 012, prior to entering Elk Creek; and the thine water outfall - Ol 1, prior to entering Sanbom Crcek. If the permittee, using the approved analytical methods, monitors any parameter 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 [he Dischazge Monitoring Report Form (DMRs) or other forms as required by the Division. Such increased frequency shall also be indicated. Outfall 007 Monitoring Exemption: The permittce is exempted from monitoring at outfall 007 during periods when access would be hazardous to personnel. For each reporting period that an exemption is requested, the permittce shall provide written documentation of the conditions and specific periods during which access was restricted. The Division will review this documentation and determine if an exemption is justified. If safe access is possible during a portion of a reporting period, the pettnittce shall imspcet the discharge at the specified frequencies. (c) Oil and Grease Monitorine . For every ou[fall with oil and grease monitoring, in the even[ an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR. [n addition, corective action shall be [aken immediatcly to mitigate the discharge of oil and grease. A description of the cortcetive action taken should be included with the DMR. see Pare I.c. for Definitions. APR 1 7 1997 JUN 1 - 1997 Amendment No. I Issued __ Effective