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PART I <br />Page 13 <br />Permit No. CO-0000221 <br />• A. TERMS AND CONDITIONS <br />5. ~5'hole Efnuent Toxicity Testin¢ Requirements (Chronic) - OutfalLS 004 and 008 (continued) <br />iii. During the period of the toziciry incident it has properly maintained and operated all :acilities and systems <br />of vestment and control; and <br />iv. Despite We circumstances described in paragraphs i. and iii. above, the source and/or cause of toxicity <br />could not be located or resolved. <br />If deemed appropriate by the Division, the permit or the compliance schedule tray be modified to revise the ongoing <br />monitoring and toziciry investigation requirements to avoid an unproductive expenditure of the permittce's resources, <br />provided that the underlying obligation to eliminate any continuing ezceedance of the toxicity limit shall remain. <br />f. Spontaneous Disaooearance <br />If toziciry spontaneously disappeazs at any time after a test failure, the permittee shall notify the Division in writing <br />within l4 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to <br />develop and submit additional information which may include, but is not limited to, the results of additional testing. <br />If no pattern of tonicity is identified or recurring tonicity is not identified, the toxicity incident response is <br />considered closed and normal WET testing shall resume. , <br />g. Tozicin~ Reooener <br />This permit tray 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 <br />the following events occur: <br />Tonicity 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 <br />action. <br />iii. The PTl/TIE reveals other unique conditions or characteristics which, in the opinion of the Division, justify <br />the incorpora[iott of unanticipated special conditions in the permit. <br />iv. The Division may reopen this permit and impose chronic toxiciq• limits where chronic toziciry is identified. <br /> <br />INDBP 4/9/93 <br />