2010-09-03_REPORT - C1980007

• Permit No: C1980007
• IBM Index Class Name: REPORT
• Doc Date: 9/3/2010
• Doc Name: 2009 AHR Review Letter
• From: DRMS
• To: Mountain Coal Company, LLC
• Annual Report Year: 2009
• Permit Index Doc Type: Hydrology Report
• Email Name: TAK
• Media Type: D
• Archive: No

Require-

Requirement Requirement
citation ment
complied
Comment
with ?
(yes / no)
E. Compliance
with Federal' Sediment control ponds and mine water at the West Elk Mine are discharged surface water only to the
and State water CDRMS North Fork of the Gunnison River. In 2010, the West Elk Mine had no CDPS permit exceedances.
quality laws that regulation yes Mine water was not discharged in 2010, as it was being sumped in the B Seam workings. The data
pertain to 4.05.1(3) contained in the DMRs appear consistent with field observations made during CDRMS's inspections.
discharges of
surface water
F. Basic Standards CWQCC This finding of compliance is subject to verification by the Colorado Water Quality Control
for Surface regulations yes
Division
Water 3.1.11 .
The West Elk Mine is located on stream segments 2 and 6 of the North Fork of the Gunnison River.
Instream Numeric Standards for segments 2 and 6 are set forth in Rule 35 of CWQCD regulation 5
CCR 1002. Calculated Table Value Standards for instream metal concentrations are shown in Tables
A-4 and A-5 of West Elk's discharge permit (CDPS permit CO-0038776). West Elk discharges
surface runoff and/or mine water to segments 2 and 6 via CDPS outfalls, although mine water was
not discharged in 2010 because it was being sumped in the B Seam workings. CWQCD based
effluent limitations at these outfalls on values that would not cause exceedances of instream
standards. West Elk's mine water discharges at outfall 017 that caused exceedances of CDPS
G. Instream CWQCC limitations in 2008 may have temporarily caused increases in iron content in the North Fork of the
Numeric regulation yes Gunnison River, but the increases probably did cause an exceedance of instream standards.
Standards 3.3.0 Monitoring data from the North Fork at a location immediately downstream from the mine (page C-2
of 200 AHR) indicates Instream Numeric Standards were not exceeded on segments 2 and 6. (This
finding of compliance is subject to verification by the Colorado Water Quality Control Division.)
Page 2