1987-12-01_PERMIT FILE - C1981017 ‎(185)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Air Pollution Control Plan
• Section_Exhibit Name: Chaper IV Section A
• Media Type: D
• Archive: No

Chapter IV
Effluent Limits
Maximum Allowable
pH (units) 6.5 - 9.0 s.u.
Oil and Grease 10 mg/l
Total Recoverable Iron 1.0-2.0 = Mine Discharge
3.5-7.0 = Elsewhere
Total Suspended Solids* - 35 (30 day ay.)/70 (max)
Total Settleable Solids** 0.5
* Precipitation event or snowme/t = Not in effect.
**Precipitation event or snowme/t = In effect.
See Hydrologic Control Plan, Appendix 7 to Chapter II, for details of the complete Coal
Basin surface water control system.
Annual hydrologic reports are made to MLRD, and contain the most recent results of
hydrologic monitoring.
2. Probable Hydrologic Consequences
of Mining.
a. General.
The Coal Basin mining operation is located on the divide that separates the North Fork
of the Gunnison watershed from the Crystal River watershed. Drainage from the east
side of Huntsman Ridge flows east into Coal Creek to the Crystal River, then north
where the Crystal River joins the Roaring Fork River near Carbondale, approximately 17
miles north of Coal Basin. The Roaring Fork then flows northwest to the confluence of
the Colorado River at Glenwood Springs.
The drainage on the west side of Huntsman Ridge consists of a number of of small
tributaries flowing to the west and south which in turn flow into the Clear Fork and East
Muddy Creek. Both creeks flow west into the North Fork of the Gunnison which joins
the Colorado River at Grand Junction, 70 miles west of Coal Basin.
The Coal Creek Basin includes a 26.6 square mile watershed (junction with Crystal) and
consists of eight main tributary streams. The Coal Basin Mine complex presently
affects three of these drainages, namely the south and north forks of Dutch Creek, and
Coal Creek, the primary stream.
Ground water occurs in both bedrock and alluvial aquifers in the vicinity of the Coal
Basin mining operation. Bedrock strata which have the potential to be considered
aquifers are the Upper Sandstone, the Middle Sandstone, and the Rollins Sandstone.
i 7