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... . <br />PART I <br />Page z <br />Permit No. CO-0000396 <br />B. ~IONITORING REQUD2EMENTS <br />3. Acute WET Ttstin¢-Outfalls 004. 023. 024 and 026 trnntinuedl <br />If dcemed appropriate by the Division, the permit or the compliance schedule may be modified to reviu the ongoing <br />rnoni[oring and toxicity investigation requirements to avoid m unproductive expenditure of the permittce's resources, <br />provided that the tmderlying obligation to eliminate any continuing exccedance of the bxicity limit shall remain. <br />(f) Spontaneous Disaorxarance <br />If toxicity spontaneously disappears at any time after a test failure, the permittce shall notify the Division is writing <br />within 14 days of a d~~aAr;~ of disappearance of the toxicity. The Division may requiro the pertnitfee to <br />dwelop and submit additional information which may include, but is not limited to, the results of additional testing. <br />If no pattern of Wxicity is identified or reauring toxidty is not identified, the toxicity incident response is <br />considered closed end nocmel WET testing shall resume. <br />(g) Toxicity Reooener <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 is Ute <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 />(i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. <br />(ii) The PTI/'11E 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 ace the most appropriate course of <br />BCtiOn. <br />(iii) The PTI(I'IE reveals other unique conditions or characteristics which, in the opinion of the Division, justify <br />the incorporation of unanticipated special conditions in the permit. <br />C. DEFINITIONS OF TERMS <br />1. 'Acute Whole Effluent Toxicity' exists whenever the LCb, which represents m estimate of the eflluwt concwtration <br />whim is lethal l0 50% of the test organisms in the tithe period prescribed by the test, is found to be less thou or oqual to <br />100% eftluwt. <br />2. 'Composite' sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and <br />proportioned according to flow. <br />3. 'Continuous' measurement, is a tneasuremeat obtained from as automatic recording device which continually measures <br />provides measurements. <br />4. 'Daily Maximum Limitation' means the limitation for this parameter shall be applied as an instantaneous maximum (or, <br />for pH or DO, instantaneous minimum) value. The instantaneous value is defined az the analytical result of any <br />individual sample. DMRs shall include the maximum (and/or minimum) o(all instantaneous values within the calendar <br />month. Any instantaneous value beyond the noted daily maximum limitation (or the indicated parameter shall be <br />considered a violation o(this permit. <br />5. 'Grab' sample, is a single 'dip and take' sample so az W be representative of the parameter being monitored. <br />6. 'In-situ' measurement is defined az a single reading, observation or measurement taken in the field at the point of <br />discharge. <br />i.. nnr wnJ <br />