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r._.. PART I Page lj of 19 Permit No. CO-0032.115 ~`~ B. MONTTORING REQD'IItETff~SIIS 4. Acute WEI' Testin¢-Outfalls 001 002. 005, 009. 011 013. 015. 016 and 017 (continued) (e) Rest For Relief (continued) (iii) Curing the period of the toxicity incident it has properly maintained and operated all facilities and systems of treatment and control; and (iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxicity could not be located or resolved. 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 contimung exceedence of the toxicity limit shall remain. (f) Soontaneou_s Disappearance 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 disappearance of the toxicity. The Division may require the permittee to develop and submit additional infon~ation 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 resimie. (g) Toxicity Reonener This permit may be reopened and modified (following proper administrative procedures) [o include new compliance dates, additional or modified rnmierical permit limitatioru, a new or different conpliance 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 P1'I/TIE reveals other unique conditions or characteristics which, in the opinion of the Division, justify the incorporation of iu~~anticipated special conditions in the permit. C. DEFINITIONS OF TERMS L. "Acute Who Le Effluent Toxicity" exists whenever the LGSp, which represents an estimate of the effluent concentration which is lethal to 50% of the test organisms in the time period prescribed by the test, is found to be less than or equal to 100% effluent. 2. "Cortq~osite" sart~le is a minimtan of four (4) grab samples collected at equally spaced two (2) hoes intervals and proportioned according to flow. Amendment 2 Issued 03/15/94 Effective 05/01/94 Amendment 3 Issued 07/08/94 Effective 09/01/94 Amendment 4 Issued Effective