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PARTI <br />Page No. 9 <br />Permit No. COG-850000 <br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIItEMEN'I'S • ~ ~ ' ' ~- <br />3. Monitoring Requirements (continued) ' <br />Oil and Grease - In the event that an oil sheen or floating oii is observed, a grab sample shall be collected, analyzed, and reported on the <br />appropriate DMR. In addition, corrective action shall be taken immediately to mitigate the dischazge of oil and grease. A description of <br />the corrective action taken should be included with the DMR <br />Total Dissolved Solids (TDS) monitoring is required only for discharges to the Colorado River Basin. See specific facitiry ccrtification <br />rationale [o detemune whether TDS monitoring is required. <br />Total phosphorus (as P) monitoring is required for facilities which dischazge into the following drainage basins: Cherry Creek basin, <br />Chatfield Reservoir basin (i.e, upstream of the USGS gage at Waterton and on Plum Creek), Dillon Reservoir basin (i.e. Ten Mile Creek, <br />Snake River, Blue River, all tnbutaries to the Dillon reservoir), and Beaz Creek basin. The Division also reserves the right to include <br />phosphorus monitoring for any receiving waters that may later enter into phosphorus monitoring requirements. Ifphosphorus monitoring <br />is a requirement of the permit then it shall be included within the terms and conditions of the individual Certification Rationale of the <br />permit Additional monitoring for phosphorus shall be included on the (DMR) and shall be subject to the permit's monitoring and <br />reporting requirements. Phosphoms sampling shall be on a quarterly basis, taken as a grab sample. <br />C. DEFIAlITIONS OF TERMS <br />1. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides <br />measurements. <br />2. "Daily Maximum limtation" means the limitation for this pazameter shall be applied as an instantaneous maximum (or, for pH or DO, <br />instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. DMR's shall include <br />the maximum (and/or minimum) of all instantaneous values within the calendaz month. Any instantaneous value beyond the noted daily <br />max;,m,r„ limitation for the indicated parameter shall be considered a violation of this permit <br />3. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored. <br />4. "ht-situ" measurement is defined as a single reading, observation or measurement taken in [he field a[ the point of discharge. <br />5. "hstantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. <br />6. "New source" is generally defined as a coal mine (or major alteration to a coal mine) the construction of which commenced afrer May 4, <br />1984. See 40 CFR 434.11(j) for the complete definition. <br />7. "Quarterly measurement frequency" means satnples 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 discharge occurs. <br />8. "Settleable solids analytical procedure" is contained in 40 CFR 434.64. The method detection limit for measuring setfleable solids under <br />this part shall be 0.4 mVl. <br />9. "Thirty (30) day average" means the arithmetic mean of all samples collected during athirty-consecutive-dayperiod. The petmittee shall <br />report the appropriate [Wean of all self-monitoring sample data collected during the calendazmonth on the Discharge Monitoring Reports. <br />Samples shall not be used for more than one reporting period. <br />10. "Total Metals" means the concenuation of metals determined in an unfiltered sample following vigorous digestion (Section 4.1.3), or the <br />sum of the concentrations of metals in both the dissolved and suspended fractions, as descnbed in Manual of Methods for Chemical <br />Analysis of Water and Wastes. U.S. Environmental Protection Agency, Mazch 1979, or its equivalent <br />11. "Visual" observation is observing the discharge to check for the presence of a visible sheen or floating oil. <br />12. "Water Quality Control Division" or "Division" means the state Water Quality Control Division as established in <br />25-8-101 et al. <br />Additional relevant definitions are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et sew.., the Colorado Dischaz¢e <br />Permit Svstem Reeulations, (Regulation 61 - 5 CCR 1002-61) and other applicable regulations. <br />