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PART' I <br />Page No. 7 <br />Permit No.: CO-0027146 <br />iii. During the period of the toxicity incident it has properly maintained and operated all facilities and systems of <br />treatment and control; and <br />iv. Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxicity could not be <br />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 perrnittee's resources, <br />provided Urat the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. <br />f Spontaneous Disapperance <br />If toxicity spontaneously disappears at any time after a test failure, the petmittee shall notify the Division in writing <br />within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee tc develop <br />and submit additional information, which may include, but is not limited to, the results of additional testing. If no pattern <br />of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and <br />normal WET testing shall resume. <br />g. Toxicity Reopener <br />This perarit may be reopened and modified (following proper administrative procedures) to include new compliance <br />dates, additional or modified numerical permit limitarions, a new or different compliance schedule, a change in the whole <br />effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following <br />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 identified toxicant(s) represent pollutant(s) that may be controlled with specific <br />numerical Gnats and the permit issuing authority agrees that the control of such toxicants through numerical limits is <br />the most appropriate course of action. <br />iii. The PTI/fIE reveals other unique conditions or characteristics, which, in the opinion of the permit issuing authority, <br />justify the incorporation of unanticipated special conditions in the pemtit. <br />B. MONITORING REQUIREMENTS <br />1. Frequency and Sample Tvoe <br />In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part <br />LA.1, the pemtittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin <br />immediately and last for the life of the pemtit unless otherwise noted. The results of such monitoring shall be reported on the <br />Dischazge Monitoring Repor[ form (See Part I.E.) <br /> <br />INI)perBP.doe <br />Revised 09/15/03 <br />