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PARTI <br />Page No. 9 <br />Permit No.: CO-0038776 <br />3. MONITORING REQUIREMENTS (continued) <br />£ 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 be <br />collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately to mitigate <br />the dischazge of oil and grease. A descnpnon of the conective action taken should be included with the 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 the site <br />the perrnittee shall monitor the wastewater effluent at the following frequencies: <br />Self-monitoringg samples taken in compliance with the monitoring requirements specified above shall be taken at those locations <br />listed in Part I.B.1. <br />Where, based on a minimum.of 5 samples, the pemvttee 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 pemrittee may measure <br />and report TDS in terms of electrical conductivity. <br />C. DEFRQITIONS OF TERMS <br />1. "Acute Toxicity" means there shall be no acute toxicity in the effluent from the appplicable discharge point. The acute toxicity <br />limitation is exceeded if 1) a statistically significant difference in mortality (at the 95% confidence level) rs observed for either-- <br />species 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. "Chronic lethality" occurs when a statistically si ficant difference, at the 95% confidence level, occurs in the chronic test between <br />the mortality of the test species in 100% effluent~e chronic IWC = ] 00%) and the control. <br />3. "Co osite" sample is a minunum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned <br />according to flow. <br />"Continuous" measurement, is a measuiement obtained from an automafic recording device which continually measures provides <br />measurements. <br />5. "Daily Maximum limitation" means the-limitation for this -parameter shall be applied as an instantaneous maximum (or, forppH or <br />DO instantaneous minimum) value. The instantaneous value rs defined as the anaht~cal result of any individual sample. llMRs <br />shad include the maximum (and/or minimum) of all instantanbous values within the calendaz month. Any instantaneous value <br />beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. <br />6. "Dissolved (D) metals fraction" is defined in the Basic Standazds and Methodolo 'es for Surface Water 1002-31, as that portion of a <br />water and suspended sediment sample which passe oug a or mtcton mein rang filter. Determinations of <br />"dissolved" constituents aze made using the filtrate. This may include some very sma (colloidal) suspended particles which passed <br />through the membrane filter as well as the amount of substance present in true chemical solution. <br />7. "Grab" sample, is a single "dip and take" sample so as to be representafive of the pazameter being monitored. <br />8. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. <br />9. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. <br />10. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standazds and Methodolo ies for Surface Water 1002-31, as that <br />portion of a constituent measured from the filtrate of a water an suspen a se grit same e t was st treate with nitric acid to <br />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 <br />the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical procedure used for the <br />constituent measured. <br />11. "Quarterly measurement freqquency" means samples may be collected at any time during the calendaz quarter if a continual dischazge <br />occurs. If the discharge is intermittent, then samples shall be collected during the period that dischazge occurs. <br />12. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters or pump hour meters where <br />previously approved.) <br />13. "Seven (7) day average" means, with the exception of fecal coliform bacteria, the arithmetic mean of all samples collected in a seven <br />(7) consecutive day period. For fecal coliform bacteria, it is the geometric mean of all samples taken in a seven (7) consecutive day <br />period. Such seven (7 day averages shall be calculated for all calendaz weeks, which aze defined as beginning on Sunday and <br />endin on Saturday. Tf`the calendaz week overlaps two months (i.e. the Sunday is in one month and the Saturday m the following <br />month, the seven (7) day average calculated for that calendar week shall be associated with the month that contains the Saturday. <br />Samples may not be used for more than one (1) reporting period. (Not applicable to fecal coliform determinations.) <br />14. "Thirty (30) day average" means, exceeppt for fecal coliform bacteria, the arithmetic mean of all samples collected during a thirty (30) <br />consecutive-day period For fecal coliform bacteria, it is the geometric mean of all samples collected in a thuty (30) day period TThhe <br />pemvttee shall report the appropriate mean of all self-monitoring sample data collected during the calendaz month on the Dischazge <br />Monitoring ReporLS. Samples shall not be used for more than one (1) reporting period. <br />xevisea at9aooa <br />