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PART I Page No. Il Permit No. COG-850000 B. EFFLUENT LII~II'PATIONS AND MONITORING REQUIItEMFNfS 3. Monitatine Requirements (continued) Oil and Gtrase - In the event thu an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriaze DMR. Ia addition, wrrcaive action shall be taken immediately to mitigate the discharge of oil and grrase. A description of the wrrative action taken should be included with the DMR Total Dissolved Solids (I'DS) monitoring is requited only for discharges to the Colorado River Basin. See specific facility certification rationale to determine whether TDS monitoring is required. Total phosphorus monitoring is required ady for discharges to the Dillon Reservoir drainage area (i.e., Ten Mile Creek, Snake River, Blue River, and all odru tributaries to the Dillon Reservoir) and for discharge to the Upper Bear Creek drainage area. See specific facility certification rationale to determine whether phosphorus monitoring is required. C. DEFINITIONS OF TERMS 1. 'Continuous' measurement, is a measutrment obtained from an automatic recording device which wntinually meazurcs provide measurements. 2. "Daily Maximum limitation' means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH or DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of nay individual sample. DMRs shall include the maximum (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. 3. 'Grab' sample, is a single 'dip and take' sample so as to be represmtazive of the parametu being monitored. 4. 'In-sim' measuremrnt is defined as a single reading, observation or measurement taken is the field az the point of ` - discharge. 5. 'lnstantaneotu' measurement is a single trading, obsrvazion, or measurement performed on site using existing monitoring facilities. 6. 'New source' is generally defined as a wal mine (or roajor alteration to a coal mine) the wnsttuction of which commr~r.~i Sfrer May 4, 1984. See 40 CFR 434.11(j) for the w[nple[e definition. 7. 'Quarterly ~~,~,Mt frequency' means samples may be wliected at any time during the calendar quarter if a wntinual discharge occurs. If the discharge is intermittent, then samples shall be wllected during the period thaz discharge ocnus. 8. "Settleable solids analytical procedure' is wmained in 40 CFR 434.64. The method detection limit for measuring settleable solids undo this part shall be 0.4 m[/f. 9. 'Thirty (30) day average' means the arithmetic mean of all samples wllected during athirty-consecutive-day period. The petmittee shall trport the appropriate mean of all self-monitoring satuple data wlletted during the calendaz month on the Discharge Monitoring Reports. Samples shall not be used for more than one reporting period. 10. 'Total Metals' means the wnantrazion of metals determined in an unfilured sample followiag~ vigorous digestion (Section 4.1.3), or the sum of the waceatntions of melds in both the dissolved and suspended fractions, as described is Manual of Methods for Chemical Analysis of Wazer and Wastes. U.S. Environmental Protection Agency, March 1979, or its equivalen[ 11. 'VisuZl.'.observazion is observing the discharge to chxk for the presence of a visible sheen or floating oil. 12. 'Water Quality Control Division' or 'Division' means the state Water Quality Control Division as established in 25-8-101 et al. Additional relevant definitions are found in the Colorado Water Quality Control Ad, CRS §§ 25-8-101 d sea.. the Rye ulatior~s for the State Discharge Permit System, 5 CCR 1002-2, § 6.1.0 et ses. and other applicable regulations.