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• ~~. <br />B. MONTTORING REQUIl2EMENTS <br />1. Freauencv and Sample Type (continued) <br />Flow, Upstream Trout Creek, MGD Weekly <br />Settleable Solids, mJ/T. Monthly <br />Oil and Grease, mg/1v Weekly <br />pH, s.u. (Minimum-Maximum) Weekly <br />Whole Effluent Toxicity, Chronic Quarterly <br />PARTI <br />Pcrmit No. CO-0032638 <br />Page No. 7 <br />Instantaneous or Continuous <br />Grab <br />Visual <br />In-Sim <br />Grab <br />Mercury (Total) Monthly Grab <br />THE PERMITTEE SHALL CEASE ALL IRRIGATION FLOW THROUGH KOLL DITCH #3 AT LEAST 36 HOURS <br />PRIOR TO COLLECTION OF EFFLUENT SAMPLES AT OUTFACE 007 TO ENSURE THAT NO DILUTION <br />OCCURS. <br />Self-monitoring sampling by the pemrittee for compliance with the monitoring requirements specified above shall be <br />performed at the following locations: outfalls 001 and 004 - at the final settling pond ouffalls prior to entering the immediate <br />receiving waters (Oak Creek and Trout Creek, respectively); outfall 007 (which represents the combined discharges from <br />former outfalls 002, 003, and 006) - in Koll Ditch #3, at the point shown in Figure 4. 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, <br />then the results of such monitoring shall be included in the calculation and reporting of the values required in the Discharge <br />Monitoring Report Form (DMRs) or other forms as required by the Division. Such increased frequency shall also be <br />indicated. <br />c. Ofl and Grease Monitorine <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 addition, corrective action shall be taken immediately <br />to mitigate the dischazge of oil and grease. A description of the corrective acfion taken should be included with the <br />DMR. <br />2. Salim~t Parameters <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 pemtittee shall monitor the wastewater effluent at the following frequencies: <br />e <br />001, 004, and 007 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 />C. DEFRVITIONS OF TERMS <br />1. "Acute Toxicity" means there shall be no acute toxicity in the et37uent 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 />etiluent (including 100% effluent) exceeds 50%. <br />2. "Composite" sample is a minimtun 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. "Chronic lethality" occurs when a statistically significant difference, at the 95% confidence level, occurs in the chronic test <br />between the mortality of the test species in 28.6% effluent (the chronic IW C = 28.6%) and the control. <br />ISSUER: November 27, 2002 EFFECTIVE: January 1, 2003 EXPIRES: February 28, 2006 <br />