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.~, <br />PART I <br />Pasc z <br />Pcrmit No. CO-0000396 <br />B. ~lONITORWG REQUII2EMENTS <br />3. Acute WET Teslin¢-Outfalls 004. 073. 024 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 tonicity investigation requirements to avoid m unproductive expenditure of the permittee's resourpes, <br />provided that the underlying obligation to elirttinate my continuing ezexdance of the tonicity limn shall remain. <br />(f) Spontaneous Disapprarrmce <br />If tonicity spontaneously disappears at my. time after a test failure, the permittee shall notify the Division is writing <br />within 14 days of a demonstration of disappearance of the tonicity. 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 E identified or ravrring toxicty is not identified, the tonicity incident rcspoau is <br />considered closed and normal WEI' tcstiag shall resume. <br />(g) Tonicity Reonurer <br />This permit may be reopened and modified (following proper administrative procedures) to include sew complimce <br />dates, additional or modified numerical permit limitations, a sew or different complimce schedule, a change in the <br />whole effluent toxicity tcsting protocol, or any other conditions related to the control of toxicants if one or more of <br />the following events occur. <br />(i) Toxicity bas been demonstrated in the effluent and the permit does not contain a tonicity limitation. <br />(ii) The PTIlIIE results indirste that the toxicant (s) represent pollutant(s) that may be controlled with specific <br />numerical limits, and the Division agrrxs that the numerical controls are the most appropriate course of <br />action. <br />(iii) The PTIlT1E reveals other unique conditions or characteristics which, in the opinion of the Division,justify <br />the incorporation of unanticipated special conditions m the permit. <br />C. DEFINITIONS OF TERMS <br />1. 'Acute Whole Effluent Tonicity' exists whenever the Lf..s, which represents m estimate of the effluent coacwtration <br />which is lethal W 50% oC the test organisms in the time period prescribed by the test, is found to be less than or ogttal to <br />100% efilueat. <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 measurement obtained from m aummatic recording device which continually measures <br />provides measurements. <br />4. 'Deily Maximum limitation' means the limitation (or this parameter shall be applied as m iastantaneotrs maximum (or, <br />(or pH or DO, instantaneous minimum) value. The instantaneous value is defined as the saalylical rrsult of my <br />individual sample. DMRs shall include the maximum (and/or minimum) of sll instaataaoous values within the calendar <br />month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be <br />considered a violation of this permit. <br />5. 'Grab' sample, is a single 'dip and take' sample so u to be representative of the parameter being monitored. <br />6. 'In-situ' measurement is defined as a single reading, observation or measurement taken in the field at the point of __ <br />discharge. - ----- <br />-_ ._ _ ~__ ... -~Y <br />