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PARTI <br />Pertmt No. CO-0032638 <br />Page No. 7 <br />B. MONITORING REQUIl2EMENTS <br />1. Frequency and Sample Tvoe (continued) <br />Flow, Upstream Trout Creek, MGD Weekly Instantaneous or Continuous <br />Settleable Solids, mJ/~, Monthly Grab <br />Oil and Grease, mg/7v Weekly Visual <br />pH, s.u. (Minimum-Maximum) Weekly In-Situ <br />Whole E8luent Toxicity, Chronic Quarterly Grab <br />Mercury (Total) Montlily Grab <br />THE PERMITTEE SHALL CEASE ALL IRRIGATION FLOW THROUGH KOLL DTTCH #3 AT LEAST 36 HOURS PRIOR TO <br />COLLECTION'OF EFFLUENT'SAMPLES AT'OUTFALL 007 TO ENSURE THAT NO DII;UTION OCCURS. <br />Self-monitoring sampling by the permittee for compliance with the monitoring requirements specified above shall be performed at the <br />following locations: ouffaQ 004 - at the fmal settling pond outfalls prior to entering the immediate receiving waters (Trout Creek); outfall <br />007 (which represents the combined discharges from former ouffalls 002, 003, and 006) - in Koll Ditch #3, at the point shown in Figure 4. <br />Koll Ditch #3 flows into Trout Creek. <br />If the permittee, using the approved analytical methods, monitors any pazameter more frequently than required by this permit, then the <br />results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge Monitoring Report <br />Form (DMRs) or other forms as required by the Division. Such increased frequency shall also be indicated. <br />b. Oil and Grease Monitoring <br />For every ouffall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall be collected, <br />analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediatelyto mitigate the discharge of <br />oil and grease. A description of the corrective acton taken should be included with the DMR. <br />2. Salinity Parameters <br />In order to obtain an indication of the quantity of Salinity, measured as total dissolved solids (TDS), being discharged from the site the <br />pemtittee shall monitor the wastewater effluent at the following frequencies: <br />_,Qtitfalls.`....,;~..::.~.~ieguencY .~..s:.. ,_ aK"_..:.a ..,~...;.'.s Samp'1e=I'YP_e,.,:~~sA_ ~~ y <br />004 and 007 Quarterly Grab <br />Self-monitoring samples taken in compliance with the monitoring requirements specified above shall be taken at those locations listed in <br />Part I.B.1. <br />C. DEFINITIONS OF TERMS <br />1. "Acute Toxicity" means there shall be no acute toxicity in the effluent from this dischazge point. The acute toxicity limitation is exceeded <br />if 1) a statistically significant difference in mortality (at the 9S% confidence level) is observed for either species between the control and <br />any dilution less that or equal to the identified IWC or 2) a species mortality in any dilution of effluent (including 100% effluent) exceeds <br />50%. <br />2. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according <br />to flaw. <br />3. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides <br />measurements. <br />4. "Chronic lethality" occurs when a statistically significant difference, at the 9S% confidence level, occurs in the chronic test between the <br />mortality of the test species in 28.6% effluent (the chronic IWC = 28.6%) and the control. <br />ISSUED: September 22, 2003 EFFECTIVE: September 22, 2003 EXPIRES: February 28, 2006 <br />See Part I.C. for Definitions. <br />