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' PART? Page No. 9 Permit No. COG-850000 EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 3. Monitoring Requirements (continued) Oil and Grease - In the event that an oil sheen or floating oil is observed, a grab sample shall he collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately to mitigate the dischazge of oil and grease. A description of the corrective action taken should be included with the DMR Total Dissolved Solids (TDS) monitoring is required only for discharges to the Colorado River Basin. See specific facility certification rationale to determine whether TDS monitoring is required. Total phosphoms (as P) monitoring is required for facilities which dischazge into the following drainage basins: Cherry Creek basin, Chatfield Reservoir basin (i.e. upstream of the USGS gage at Waterton and on Plum Creek), Dillon Reservoir basin (i.e. Ten Mile Creek, Snake River, Blue River, all tributaries to the Dillon reservoir), and Beaz Creek basin. The Division also reserves the right to include phosphorus monitoring for any receiving waters that may later enter into phosphorus monitoring requirements. If phosphorus monitoring is a requirement of the pemtit then it shall be included within the terms and conditions of the individual Certification Rationale of the permit. Additional monitoring for phosphoms shall be included on the (DMR) and shall be subject to the pernilt's monitoring and reporting requirements. Phosphorus sampling shall be on a quarterly basis, taken as a gab sample. DEFINITIONS OF TERMS 1. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides measurements. 2. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH or DO, instamaneous minimum) value. The instantaneous value is defined as the analytical result ofany individual sample. DMR's shall include the maximum (andlor minimum) of all instantaneous values within the calendaz 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 representative of the pazameter being monitored. 4. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the point of discharge. 5. "Instantaneous" measurement is a single reading, observation, or measurement performed on site using existing monitoring facilities. 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, 1984. See 40 CFR 434.11(j) for the complete definition. 7. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual dischazge occurs. If the dischazge is intermittent, then samples shall be collected during the period that dischazge occurs. 8. "Settleable solids analytical procedure" is contained in 40 CFR 434.64. The method detection limit for measuring settleable solids under this part shall be 0.4 tnl/1. 9. "Thirty (30) day average" means the arithmetic mean of all samples collected during athirty-consecutive-day period. The permittee shall report the appropriate mean of all self-monitoring sample data collected 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 concentration of metals determined in an unfiltered sample following vigorous digestion (Section 4.1.3), or the sum of the concentrations of metals in both the dissolved and suspended fractions, as described in Manual of Methods for Chemical Analvsis of Water and Wastes, U.S. Environmental Protection Agency, March 1979, or its equivalent 11. "Visual" observation is observing the discharge to check 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 aze found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et sec ..., the Colorado Dischazge Permit System Regulations, (Regulation 61 - 5 CCR 1002-61) and other applicable regulations.