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PARTI Permit No. CO-0029599 Page No. 8 ~ B. MONITORING REQUIREMENTS ~ • 2. Salinity Parameters ' i In order to obtain an indication of the quantity of Salinity, measured as total dissolved solids (TDS), being discharged from the site the permittee shya~ll~~monitor the wast~eywatger~effluent at the following frequencies: itOntfall: ~' ~ 1" '`'"~:, 3"'~'.s :,~' ~ ~"+'+wltlCIICy. 'l~G.~LrtK.:?+t~ l.~'k5'8111ple'~'per~':cy~X'i 001, 005 Quarterly Grab Self-monitoring samples taken in compliance with the monitoring requirements specified above shall be taken at those locations listed in Part I.B.1. 3. One-Time Analysis-Outfall 001 ~ In order to determine the specific quality of water discharged from outfall 001, the petmittee is required to perform a one time analysis for the following pazametets. The sample type for this analysis is grab. The monitoring and analysis shall be performed at the fast instance of dischazge after this permit becomes effective. Following analysis, the data shall be submitted to the Division within forty five days of the sampling date. Parameters (all in me/Q): Potengally Dissolved Copper, Potentially Dissolved Lead, Total Mercury, Potentially Dissolved Nickel, Potentially Dissolved Selenium, Potentially Dissolved Silver. i If evaluation of the data demonstrates a definite or probable violation of water quality standards, Ute~permit may be amended to incorporate additional monitoring and/or limitations, as allowed under Part II.B.S of this permit. Additional monitoring may also be required where the detection limit for a parameter is above the appropriate w~ quality standards or the incorect metal fraction was analyzed. ~ I C. DEFINITIONS OF TERMS ' I 1. "Composite" sample is a minimum of four grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. ~ i 2. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides measurements. 3. "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 66% effluent (the chrot>ic IWC = 66%) and the control. 4. "Daily Maximum limitation" means the limitation for tltis parameter shall be applied as an instantatieous 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 month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit, 5. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. I 6. "In-situ" measurement is defined as a single reading, observation or measurement taken in the fieldiat the point of discharge. i 7. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. i 8. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Me[hodolot;ies for Surface W- 1002-31, as that portion of a constituent measured from the filtrate of a water and suspended sediment sample th was first 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 dte analytical procedure used for the cotutiment measured. ~ See Pari I.C. for Defmitious.