Laserfiche WebLink
PART I <br />Page x <br />Permit No. CO-0000396 <br />B. MONITORING REQUIREMENTS <br />3. Acute WET Testing-Outfalls 004. 023. 024 and 02ti (continued) <br />If dxmed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing <br />monitoring and toxicity investigation roquirements to avoid an unproductive expenditure of the permittx'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 disappears at any time after a teat failure, the permittx shall notify the Division in writing <br />within 14 days of a demonstration of disappearance of the toxicity. Tho Division may tetptire the permittee to <br />develop and submit additioml information which may include, but is not limited to, the results of additional testing. <br />If no pattern of toxicity is identified yr recurtiag toxicity is not identified, the toxicity incident response is <br />considered closed and normal WET testing shall resume. <br />(g) Toxicity Renpener <br />This permit may be renpened and modified (following proper administrative procedures) to include new compliance <br />dates, additional or modified numerical permit limitations, a pew or different compliance schedule, a chmge 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 />(i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. <br />(ii) The PTI/T7E 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 Ute most appropriate course of <br />action. <br />(iii) The PTI/IIE 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 LCm, which represents m estimate of the effluent concentration <br />which is lethal to 50% of the test organisms is the time period prescribed by the test, is found to be less than pr equal to <br />100% effluent. <br />2. 'Composite' sample is a minimum of four (4) grsb samples collected at equally spaced two (2) hour intervals and <br />proportioned according to Flow. <br />3. 'Continuous' measuremept, is a measurement obtained from an 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 as the analytical result of any <br />individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar <br />month. Any instantaneous value beyoad the noted daily maximum limitation for the indicated parameter shall be <br />considered a violation of Otis permit. <br />5. 'Grab' sample, is a single 'dip and take' sample so as to be represeptative of the parameter being monitored. <br />6. 'In-situ' measurement is defined as a single reading, observation or measurement taken in the field et the point of <br />discharge. <br />isnar .AAt <br />