PERMFILE100069

• Permit No: C1992081A
• IBM Index Class Name: Permit File
• Doc Date: 5/19/2003
• Doc Name: Colorado Discharge Permit Certification for COG-850008
• Section_Exhibit Name: Tab 13 Appendix 13-1
• Media Type: D
• Archive: Yes

PART I
Pace No. 11
Permit No. COG-850000
EFFLUENT LIMITATIONS AND MONTTORING REQUII2EMENTS
3. Monitoring Reouirements (continued)
Oil and Grease - In the event that an oil sheen or floa[ing oil is observed, a grab sample shall be collected, analyzed,
and reported on the appropriate DMR. in addi[ion, 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 de[ermine whether TDS monitoring is required.
Total pbospborus motvtoring is required only for discharges to the Dillon Reservoir drainage area (i.e., Ten Mile
Creek, Snake River, Blue River, and all other tributaries to the Dillon Reservoir) and for dischazges to the Upper Bear
Creek drainage area. See specifc facility certification rationale [o de[errrtine whether phosphorus monitoring is required.
C. DEFINTI70NS OF TERMS
I. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures
provides measurements.
2. "DaSly Maximum [imitation" means the limitation for this parameter shall be applied as an instantaneous maximum (qr,
for pH or DO, instantaneous minimum] value. The instantaneous value is defined as the analytical result of any
individual sample. DMRs shall include the maximum (and/or minimum) of all instzntareous values within the calendar
month. Any instantaneous value beyond the noted daily maximum litni[a[ion for the indicated parameter shall be
considered a violation of this permit.
3. 'Grab" sample, is a single "dip and [ake" sample so as to be representative of the parameter being monitored.
4. 'In-situ" measurement is defined as a sin_ole readin¢, observation or measurement taken in the field at the point of
dischazge.
5. 'Instantaneous' measurement is a single reading, observation, or measuremen[ performed on site using existing
monitoring facilities.
6. "New source" is generzlly defined as a coal mine (or major al[eration to a coal mine) the construction of which
commenced after May 4, 1984. See 40 CFR 434.11 Q) for the complete definition.
7. -Quarterly measurement frequency" means samples may be collected at wy time during the calendar euarrer if a
continual discharge occurs. If the discharge is interminea[, [hen samples shall be collected during the period [hat
discharge oaurs.
8. 'Settleable solids analytical procedure" is con[ained in 40 CFR 434.64. The method detection limit for measuring
settleable solids under this part shall be 0.4 mP/P.
9. 'Thirty (30) day average" means the arithmetic mean of all samples collet:ed during a thim-consecutive-day period.
The pertnittee shall report the appropriate mean of all self-monitoring sampic data collected during the calendar month
on the Discharge Monitoring Reporu. Samples shall not be used for more than one reponing period.
10. "Total Meals" means the concenvaticn of metals determined in an unfiltered sample following vigorous digestion
(Section 4.1.3), or the sum of the concenvatiorts of metals in bo[h the dissolved and suspended fractions, as described in
Manual of Methods for Chemical Analysis of Water and Wastes, U.S. Environmental Protection Agency, March 1979,
or its ecuivalent
11. 'Visual" observation is observing dre dischazge [o 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 \Vter Quality Control Act, CRS §§ 25-8-101 et seo•, the
Re~ulatiotu for the State Discharge Permit System, 5 CCR ]002-2, § 6.1.0 et seq. and other applicable regulatioru.