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PARTI Page No. 10 Pertnit No.: CO-0044776 r L J Outfatl Parameters 006 total recoverable (TR) azsenic, potentially dissolved (PD) cadmium, TR trivalent chromium, PD copper, TR iron, dissolved iron, dissolved manganese, total mercury, PD nickel, PD selenium, PD silver, and PD zinc If the monitoring shows that there is a reasonable potential fot any of these pazameters to cause exceedence of the applicable water quality standards, the permit tray be reopened io add limits and/or monitotng subject to public notice requirements. C. DEFINITIONS OF TERMS 1. "Chronic lethality" occurs when a statistically significant difference, at the 95 % confidence level, occurs in the chronic test between the mortality of the test species in 100% effluent (the chronic IWC = 100%) and the control. 2. "Composite" sample is a nilnimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. 3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures 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 calendar mondr. Any instantaneous value beyond the noted daily maximmn limitation for the indicated parameter shall be considered a violation of this permit. 5. "Dissolved (D) metals fraction" is defined in the Basic Standazds and Methodologies for Surface Water 1002-31, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 IJbi (micron) membrane filter. Determinations 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 the amount of substance present in true chemical solution. 6. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. 7. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. 8. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 9. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was fast treated with 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-UM (micron) membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical procedure used for the constituent measured. 10. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected durutg the period that discharge occurs. 11. "Recordei' requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where previously approved.) 12. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in a seven (7) consecutive day period. For fecal colifortn bacteria, it is the geometric mean of all samples taken in a seven (7) consewtive day period. Such seven (7) day averages shalt be calculated for all calendar weeks, which are defined as beginning on Sunday and ending on Saurday. If the calendar week overlaps two months (i. e. the Sunday is in one month and • the Saturday 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 not be used for more than one (1) reporting period. (Nof applicable to fecal coliform determinations.)