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PARTI <br />Page No. 10 ", , <br />Pertnit No.: CO-0032115 <br />Outfall Parameters <br />011, 017, 019, 020, 021, 023 total recoverable (TR) azsenic, TR cadmium, TR copper, total trivalent chromium, <br />TR lead, TR selenium, and TR zinc <br />If the monitoring shows that there is a reasonable potential for any of these parameters to cause exceedence of the <br />applicable water quality sandads, the permit may be reopened to add limits and/or monitoring subject to public notice <br />requirements. <br />C. DEFINITIONS OF TERMS <br />1. "Acute Toxicity" means there shall be ao acute toxicity in the effluent from this dischazge point. The acute toxicity limitation <br />is exceeded if 1) a statistically significant difference in mortality (at the 95% confidence level) is observed for either species <br />between the control and any dilution less that or equal to the identified IWC or 2) a species mortality in any dilution of <br />effluent (including 100% effhtent) exceeds 50%. <br />2. "Composite" sample is a minimum of four (4) grab sarttples collected at equally spaced two (2) hour intervals and <br />proportioned according to flow. <br />3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures <br />provides measurements. <br />4. "Daily Max;mnm ]imitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for <br />pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual <br />sample. DMRs shall include the maxi~~ (and/or minimum) of all instantaneous values within the calendaz month. Any <br />instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of <br />this permit. <br />5. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodoloeies for Surface Water 1002-31, as that <br />portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 IIM (micron) membrane filter. <br />Determinations of "dissolved" constituents aze made using the filtrate. This may include some very small (colloidal) <br />suspended particles which passed through the membrane filter as well as the amount of substance present in tine chemical <br />solution. <br />6. "Grab" sample, is a single "dip and take" sample so as to be representative of the pazameter being monitored. <br />7. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. <br />8. "Instantaneous" measurement is a single reading, observation, or measurement perfomred on site using existing monitoring <br />facilities. <br />9. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standazds and Methodoloeies for Surface Water 1002-31, <br />as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first treated with <br />nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior to sample filtration using a 0.40 or 0.45-iIM (micron) <br />membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical <br />procedure used for the constituent measured. <br />10. "Quarterly measurement frequency" means samples maybe collected at any time during the calendaz quarter if a continual <br />dischazge occurs. If the discharge is intermittent, then sarrtples shall be collected during the period that dischazge occtrs. <br />11. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters <br />where previously approved.) <br />12. "Seven (7) day average" means the azithmetic mean of all samples collected in a seven (7) consecutive day period. Such <br />seven (7) day averages shall be calculated for all calendaz weeks, which aze defined as beginning on Sunday and ending on <br />Saturday. If ilte calendaz week overlaps two months (i.e. the Sunday is in one month and the Saturday in the following <br />month), the seven (7) day average calculated for that calendaz week shall be associated with the month that contains the <br />Saturday. Samples may not be used for more than one (1) reporting period. <br />13. "Thirty (30) day average" means the arithmetic mean of all samples collected during a thirty (30) consecutive-day period. <br />The permittee shall report the appropriate mean of all self-monitoring sample data collected during the calendaz month on the <br />Dischazge Monitoring Reports. Samples shall not be used for more than one (1) reporting period <br />