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PARTI Page 8b Permit No. CO-0044776 A. DEFINITION OF EFFLUENT LIMITATIONS 7. Whole Effluent Toxicity Testing Requirements (Chronic) Outfall 005 (continued) (f) Spontaneous Disappeazance If toxicity spontaneously disappears at any time after a test failure, the permittee shall notify the Division in writing within 14 days of a demonstration of disappeazance of the tonicity. The Division may require the permittee to develop and submit additional information, which may include, but is not limited to, the results of additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume. (g) Toxicity Reopener This permit may be reopened and modified (following proper administrative procedures) to include new compliance dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following events occur: (i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. (ii) The PTI/TIE results indicate that the toxicant(s) represent pollutant(s) that may be controlled with specific numerical limits, and the Division agrees that the numerical controls are the most appropriate course of action. (iii) The PTI/TIE reveals other unique conditions or chazacteristics which, in the opinion of the Division, justify the incorporation of unanticipated special conditions in the permit. (iv) The Division may reopen this permit and impose chronic toxicity limits where chronic toxicity is identified. ~. B. MONITORING REQUIREMENTS 1. Freanencv and Sample Tvoe In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A.1, the permittee shall monitor all effluent parameters 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 reported on the Dischazge Monitoring Reports (DMR) (see Part I.E.1. for routine reporting requirements). Also see Part I.B.2. for additional monitoring requirements. a. Ouffalls 001 and 003 Effluent Parameter Measurement Freq_uency Sample Tune Flow, MGD Weekly Instantaneous or Continuous Total Suspended Solids, mg/Q Monthly Grab Total Iron, mg/t Monthly Grab Settleable Solids, mQ/Q Monthly Grab Oil and Grease, mg/Q Weekly Visual pH, s.u. Weekly In-sim See Part I.C. for Definitions. Amendment No. 2 Issued ~tive FE B U ~ ~np4