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PART I <br />Page x <br />Permit No. CO-0038024 <br />~. MONITORING REQUIREMENTS <br />3. Acute WET T tine-Outfalls 004. 023. Old and 026 (continued) <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 req++;•srnts to avoid an unproductive axpmditure of the permittee's resources, <br />provided that the underlying obligation to eliminate nay continuing exceedance of the toxicity limit shall remain. <br />(F) Soontaneous Dissonearance <br />If toxicity spontaneously disappears at any time after a test failure, the permittee atoll notify the Division in writing <br />within 14 days of a dearonawtion 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 restdts of additional testing. <br />If no pattern of toxicity is identified or recurring bxicity is not identified, the toxicity incident response is <br />considered closed and normal WET testing shall resume. <br />(g) Toxicity Reopeaer <br />Thin perarit may be reopened and codified (following proper •~m;~;~*Ae;ve procedures) to include new compliance <br />dates, additioml or modified numerical permit limitations, a new or different compliance schedule, a change is the <br />whole effluent toxicity testing protocol, or any other conditions related to the conwl of toxicants if one or [Dore of <br />the following events occur. <br />(i) Toxicity has been demonawted in the effluent and the permit does not contain a toxicity limitation. <br />• (ii) The PTI/fIE results indicate that the toxicant (s) represent pollutant(s) clot may be conwlled with specific <br />numerical limits, and the Division agrees that the numerical conwL: are the most appropriate ouurse of <br />action. <br />(iii) The PTIlI~ reveals other unique conditions or ~~°~s~ :^~ca which, in the opinion of the Division, jrutify <br />the incorporation of unanticipated epecial conditions in the permit. <br />C. DEFINTfIONS OF TERMS <br />1. 'Acute Whole Effluent Toxicity' exists whenever the I-Crs, which represents as estimate of the effluent conaatntioa <br />which is lethal to 5056 of the test organisms in the time period prescribed by the test, is found to be less than or equal to <br />100% effluent. <br />2. 'Composite' sample is a minimum of four (4) grab samples collected a< equally spaced two (2) hour intervals and <br />proportioned acording to flow. <br />3. 'Continuous' ~^-°a++Mment, is a measurement obtained from an automatic recording device which continually measures <br />provides measurements. <br />4. 'Daily Maximum limitation' meson the limitation for this parameter shall be applied as an instantaneous maximum (or, <br />for pH or DO, instantaneous minimttm) value. The instantaneous value is defined as the amlytical result of nay <br />individual sample. DMRs shall include the maximum (and/or minimum) of all inatantaaeoue values within the calendar <br />month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be <br />considered n violation of this permit. <br />5. 'Greb' sample, is a single 'dip and take' sample eo as to be representative of the parameter being monitored. <br />• 6. 'In-situ' measurement is defined as a single reading, observation or measurement taken is the field at the point of <br />discharge. <br />