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PARTI Page No. 10 Permit No.: CO-0032115 Outfall Parameters 01 I, 017, 019, 020, 021, 023 total recoverable (TR) arsenic, TR cadmium, TR copper, total trivalent chromium, TR lead, TR selenium, and TR zinc If the monitoring shows that there is a reasonable potential for any of these parameters to cause exceedence of the applicable water quality standards, the permit maybe reopened to add limits and/or monitoring subject to public notice requuements. C. DEFINITIONS OF TERMS 1. "Acute Toxicity" means there shall be no acute toxicity in the effluent from this discharge point. The acute toxicity limitation is exceeded if 1) a statistically significant difference in mortality (at the 95% confidence level) is observed for either species between the control and any dilution less that or equal to the identified IWC or 2) a species mortality in any dilution of effluent (including 100% effluent) exceeds 50%. 2. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. 3. "Continuous" measurement, is a measwement obtained from an automatic recording device which continually measwes provides measurements. 4. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendaz month. Any instantaneous value beyond,the noted daily maximum limitation for the indicated pazameter shall be considered a violation of this permit. S. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodoloeies for Surface Water 1002-31, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 LiM (micron) membrane filter. Detemvnations of "dissolved" constituents are made using the filtrate. This may include some very small (colloidal) suspended particles which passed through the membrane filter as well as th'e amount of substance present in true chemical solution. 6. "Grab" sample, is a single "dip and take" sample so as [o be representative of the pazameter being monitored. 7. "In-situ" measwement is defined as a single reading, observation or measurement taken in the field at the point of dischazge. 8. "Instantaneous" measwement is a single reading, observation, or measwement performed on site using existing monitoring facilities. 9. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodoloeies for Surface Water 1002-31, as that portion of a constituent measwed from the filtrate of a water and suspended sediment sample that was first treated with nitric acid to a pH of 2 or less and let stand for 8 to 96 hows prior to sample filtration using a 0.40 or 0.45-UM (micron) membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere widt the analytical procedure used for the constituent measwed. 10. "Quarterly measwement frequency" means samples maybe collected at any time during the calendar quarter if a continual discharge occws. If the discharge is intemnttent, then samples shall be collected dwing the period that discharge occws. 11. "Recorder' requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump how meters where previously approved.) 12. "Seven (7) day average" means the arithmetic mean of all samples collected in a seven (7) consecutive day period. Such seven (7) day averages shall be calculated for all calendar weeks, which are defined as beginning on Sunday and ending on Satwday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the Satwday in the following month), the seven (7) day average calculated for that calendar week shall be associated with the month that contains the Saturday. Samples may no[ be used for more than one (1) reporting period. 13. "Thirty (30) day average" means the arithmetic mean of all samples collected during a thirty (30) consecutive-day period. The pemnttee shall report the appropriate mean of all self-monitoring sample data collected during the calendar month on the Dischazge Monitoring Reports. Samples shall not be used for more than one (1) reporting period.