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PART [ <br />Page zi <br />Permit No. CO-0000213 <br />B. MONITORING REQUQiEMENTS <br />3. Acute WET Testirr¢-Outfalls 001 and 007 (rnntinued) <br />(g) Tonicity Reocener <br />This permit may be reopened and modified (following proper administrative procedures) to include new complimce <br />dates, additional or modified numerical permit limitations, a new or different complimce schedule, ^ change in the <br />whole effluent toxicity testing protocol, or my other conditions related to the control of toxicants if one or mote 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/I'IE results indicate that the toxicant (s) represent pollutant(s) Wat may be controlled with spxific <br />numerical limits, and the Division agrees that We numerical controls are the most appropriate course of <br />action. <br />(iii) The PTIfI'IE reveals other unique conditions or characteristics which, in the opinion of the Division, justify <br />the incorporation of unmticipated special conditions in the permit. <br />C. DEFINITIONS OF TERMS <br />1. 'Acute Whole Effluent Toxicity' exists whenever the LCD, which represents m estimate of the effluent concentration <br />which is lethal to 50% 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 at equally spaced two (2) hour intervals and <br />proportioned according to flow. <br />3. 'Continuous" measurement, is a measurement obtained from m automatic recording device which continually provides <br />measurements. <br />4. 'Daily Maximum limitation' means the limitation for this parameter shall be applied as m instmtmoous maximum (or, <br />for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of my <br />individual sample. DMRs shall include the maximum (md/or minimum) of all iostmtmeous values within the calendar <br />month. Any instmtmeous 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 as to be representative of the parameer being monitored. <br />6. 'Insitu' measurement is defined as a single reading, observation or measurement taken in the field et the point of <br />discharge. <br />7. 'Ltstmtmeous' measurement is a single reading, observation, or measurement performed oo site using existing <br />monitoring facilities. <br />8. 'Quarterly measurement frequency' means samples may be collected at my time during the calendar quarter if a <br />continual discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that <br />discharge occurs. <br />9. 'Recorder' requires the coa[inuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour <br />meters where previously approved.) <br />INDBP 1/9/93 <br />