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PARTI <br />Page No. Sb ~ -- <br />Permit No. CO-0000132 <br />A. DEFINITION OF EFFLUENT LIMITATIONS <br />5. Whole Effluent Toxicity Testine Requirements (Chronic) - Outfa11015 (continued) <br />ii. During the period of the toxicity incident it has been in compliance with all other permit conditions, including, in <br />the case of a POTW, pre-treatment requirements; <br />iii. Dttring the period of the toziciry incident it has properly maintained and operated all facilities and systems of <br />treatment and convol; and , . <br />iv. Despite the circumstances described in pazagraphs (i) and (ui) above, the source and/or cause of toxicity could not <br />be located or resolved. <br />If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing <br />monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the permittee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. <br />(f) Spontaneous Disappearance <br />If toxicity spontaneously disappeazs at any time after a test failure, the permittee shall notify the Division in writing <br />within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to develop <br />and submit additional information which may include, but is not limited to, the results of additional testing. If no <br />pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed <br />and normal WET testing shall resume. <br />(g) Toxiciri Reocener <br />This permit may be reopened and modified (following proper administrative procedures) to include new compliance <br />dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the <br />whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the <br />following events occur: <br />i. Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. <br />ii. The PTI/TIE results indicate that the toxicant(s) represent pollutant(s) that may be controlled with specific <br />numerical limits, and the Division agrees that the numerical controls are the most appropriate course of action. <br />iii. The PTUTIE reveals other unique conditions or characteristics which, in the opinion of the Division, justify the <br />incorporation of unanticipated special conditions in the permit. <br />iv. The Division tray reopen this permit and impose chronic toxicity limits where chronic toxicity is identified. <br />See Part I.C. for DeFinitions. <br />Amendment No. 5 Issued Effective <br />pDB~ HmcnM It, 19M <br />