2007-08-17_PERMIT FILE - C1981035A (17)

Home Browse Search

PART.:1 Page No. ~ Permit No. COG-850000 <B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS ;~ Monitoring Requirements (continued) ___ Oil and Grease - In the event that an oil sheen or floating oil is observed, a grab sample shall be collected, analyzed, and reported on the appropriate DMR_ In addition, corrective action shall be taken immediately to mitigate the discharge 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 phosphorus (as P) monitoring is required for facilities which discharge 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 Bear 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 permit then it shall be included within the terms and conditions of the individual Certification Rationale of the permit. Additional monitoring for phosphorus shall be included on the (DMR) and shall be subject to the permit's monitoring and reporting requirements. Phosphorus sampling shall be on a quarterly basis, taken as a grab sample. C. DEFII~IITIONS OF TERMS "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures provides measurements. "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 any individual sample. DMR's shall include the maximum (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous value beyond the noted daily maximum limitarion for the indicated parameter shall be considered a violation of this permit. '. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter,being monitored. "In-situ" measurement is defined as a single reading, observation or measurement taken m the t~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 after May 4, 1984. See 40 CFR 434..1 _lV) for'the complete definition. ' ` s ' ` 7. "Quarterly measurement frequency" means samples may be collected at any time during the calendar quarter if a continual. discharge occurs. If the discharge is intermittent, then samples shall be collected during the period that'discharge 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. ml/l:''- _ . 9. "Thirty (30) day average" means the arithmetic mean of all samples collected during athirty-consecutive-dayperiod. The permittee shall report the appropriate mean of all self-monitoring sample data collected during the calendar 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 descnbed in Manual of Methods for Chemical Analysis 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 are found in the Colorado Water Quality Control Act, CRS §§ 25-8-101 et sue., the Colorado Discharge Permit S stem Re ulations (Regulation 61 - 5 CCR 1002-61) and other applicable regulations.