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PARTI <br />Page No. 9 <br />Permit No.: CO-0027146 <br />d. Oil and Grease Monitoring <br />For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall <br />be collected, analyzed, and reported on the appropriate DMR. In additioq corrective action shall be taken immediately <br />to mitigate the dischazge of oil and grease. A description of the corrective action taken should be included with the <br />DMR <br />2. Salinity Pazameters <br />In order to obtain an indication of the quantity of Salinity, measured as total dissolved solids (TDS), being dischazged from <br />the site the pemrittee shall monitor the wastewater effluent at the following frequencies: <br />Outfalls Frequency Samole Tvoe <br />001, 002, 005, 007, 008, 009, 010, 011, 012, 013, 014, 016 Quarterly Grab <br />Self-monitoring samples taken in compliance with the monitoring requirements specified above shall be taken at those <br />locations listed in Part I.B.1. <br />Where, based on a m;n;mnm of 5 samples, the pennittee demonstrates to the satisfaction of the Division that the level of total <br />dissolved solids (TDS) in the effluent can be calculated based upon the level of electrical conductivity, the permittee may <br />measure and report TDS in terms of electrical conductivity. <br />C. DEFINITIONS OF TERMS <br />1. "Acute Toxicity" means there shall be no acute toxicity in the effluent from this discharge 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% effluent) exceeds 50%. <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 an automatic recording device which continually measures <br />provides measurements. <br />4. "Daily Maximum limitation" 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 maximum (and/or minimum) of all instantaneous values within the calendaz month. Any <br />instantaneous value beyond the noted daily maximum limitation for the indicated pazameter shall be considered a violation of <br />this permit <br />5. "Dissolved (D)"metals fraction" is defined in the Basic Standards and Methodologies 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 [JM (micron) membrane filter. <br />Detemdnafions of "dissolved" constituents are 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 hue chemical <br />solution. <br />6. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />7. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field a[ the point of discharge. <br />\ 8. "Instantaneous" measurement is a single reading, observa[foq or measurement performed on site using existing monitoring <br />JA facilities. <br />9. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies 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 />1NDperBP.dot <br />Revised 09/15/03 <br />