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PARTI Page 7 Permit No. CO-0027146 A. TERMS AND CONDITIONS 4. Whole Effluent Toxicity Testing~quirements fAcutel - Outfallc 001 002 004 and 015 fcontin~ Ott If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the permittee's resources, provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. f. Spontaneous Disappearance If toxicity spontaneously disappeazs 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 toxicity. 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 Reo ner 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 PTUTIE 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 aze the most appropriate course of action. iii. The PTI/'f1E reveals other unique conditions or chazacteristics which, in the opinion of the Division, justify the incorporation of unanticipated special conditions in dte permit. B. MONITORING REQUIREMENTS 1. Frequency and Sample Tvpe in order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A.I; the permittee shall monitor all effluent pazameurs 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 Report (See Part i.E.l.). a. Outfalls 001. 002. 004. 015 Flow, MGD Total Suspended Solids, mg/1 Total Iron, mg/1 Oil and Grease, mg/Q pH, s.u. Total Dissolved Solids, mg/1 Whole Effluent Toxicity, Acute' Measurement Frequencv Sample Tvoe Weekly Ltstantaneous or Continuous Monthly Grab Monthly Grab Weekly Visual Weekly In-sim Quarterly Grab Quarterly Grab * For outfalls 001 and 002, the permittee shall collect a grab sample consisting of effluent from both ou[falls and proportioned according to the flow rate at the time of sample collection. This combined sample shall be identified as outfall "RSM W".