PERMFILE106134

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: NPDES PERMIT
• Section_Exhibit Name: TAB 15 APPENDIX 15-4 PART 2
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Rationale - Page 8. Permit No. CO-0000221.
VI. TERMS AND CONDITIONS OF PERMIT
2. A~olicable Federal Effluent Guidelines and Standards: The federal
guidelines which apply to this type of facility are found under 40 CFR 434,
the Coal Mining Point Source Category. The limitations which apply are:
Table VI-6 -- Federal Standards
Avg. of Daily Values Daily
Parameter for 30 Consecutive Days Maximum
T. Suspended Solids, mg/1 (BPJ, NSPS) 35 70
Total Iron, mg/1 (BAT) 3.5 7.0
Total Zron, mg/1 (NSPS) 3.0 6.0
Settleable Solids, ml/1 (Precip. Events) NA 0.5
The above federal limits are from Subpart D of 40 CFR 434, Alkaline Hine
Drainage, Best Available Technology (434.43) and New Source Performance
Standards (434.45) and Subpart F, Miscellaneous Provisions, Effluent
Limitations for Precipitation Events (434.63).
Discharge points 002, 003 and 004 are existing sources, and may contain mine
dewatering and/or spoil springs water. Therefore, the BAT and BPJ of BCT
limits apply.
Discharge points 005, 006 and DD8 are new sources, and may contain mine
dewatering and/or spoil springs water. Therefore, the NSPS limits apply.
Discharge points 009 and 010 are new sources, and discharge surface runoff
only.. Therefore, the NSPS limits apply, as well ae the Effluent Limitations
for Precipitation Events.
a) Active Mining - 009, 010:
The only Limitations which are applicable for discharge points 002, 003,
004, 005, 006 and 008 are indicated in Tables VI-1 through VI-6.
Because these points include mine drainage, spoil springs or truck
washwater, the discharges are not eligible for the storm event exemption
conditions under active mining requirements. The following discussion
is applicable for discharge points 009 and 010.
Limitations for pH and oil and grease apply to all discharges,
regardless of precipitation conditions. Additionally, TSS and total
iron samples should always be taken. If the results of the analyses
exceed the permit limit, the permittee may submit documentation proving
that the discharge was precipitation induced. The proof of the size of
the precipitation event consists of:
(i) rain gauge data or the volume of water contained in the snow, based
upon calculations from actual snow samples;
(ii) the sample resuLte for TSS, iron, pH, settleable solids and oil an~
grease; and
(iii) influent/effluent metered flow.
It is only upon acceptance by the Division of said proof that the
settleable solids limitation will apply in place of the TSS and total