2011-02-07_HYDROLOGY - C1982056

• Permit No: C1982056
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/7/2011
• Doc Name: 4th Quarter 2010 DMRS Review
• From: DRMS
• To: Twentymile Coal Company
• Permit Index Doc Type: DMR’s
• Email Name: JDM
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
February 7, 2011
Brian A. Watterson
Twentymile Coal Company
29515 Routt County Road #27
Oak Creek, CO 80467
COLORADO
D IV IS I ON OF
RECLAMATION
MINING
SAFETY
John W. Hickenlooper
Governor
Mike King
Executive Director
Loretta E. Pineda
Director
RE: Twentymile Coal Company, Permit C-1982-056
Fourth Quarter 2010 Discharge Monitoring Report Review (Permit CO-0027154, CO-
0036684, COG-850051, CO-0042161, COG-850054)
December 2010 Discharge Monitoring Report Review (Permit COG-073534)
-Dear Mr. Watterson,
The Colorado Division of Reclamation, Mining, and Safety (CDRMS) has reviewed and found the
above referenced reports to be in compliance with Rule 4.05.13(2). The 4"' quarter 2010 Discharge
Monitoring Reports for the above referenced CDPS Permits were received by the Division on 02
February 2011; the reports cover the time period from 01 October 2010 through 31 December 2010
and 01 December 2010 through 31 December 2010 in the case of COG-073534.
Permit CO-0027154 - Only outfall 005A/MON5/005W (Pond D) discharged during the fourth quarter
2010. No exceedances were noted. Outfalls 002A (Pond T), 004A (Pond C), 007A/007W/MON7
(Pond F), 003A (Pond B), 006A (Pond E) and 008A (Pond G) did not discharge during the month
noted. Whole Effluent Toxicity tests were collected for analysis for Outfall 005W during the quarter.
The tests indicated that the effluent was not acutely toxic to Daphina magna.
Permit CO-0036684 - Outfa11001A/OO1W/MON1 (Site 62) discharged throughout the quarter with no
exceedances noted. Whole Effluent Toxicity tests were collected for analysis during the quarter. The
tests indicated that the effluent was not acutely toxic to Ceriodaphnia dubia or Pimephales promelas.
Permit COG-850051 - Outfall 001/OOW (6MN Pond) did not discharge during the quarter.
Permit CO-0042161 - Outfall 002A (sites 300E and 3001) discharged during the quarter. No - ,_
exceedances were noted. Outfalls 001A/00IW/MON1 (site 115) did not discharge during the quarter.
Permit COG-073534 - Outfal1001A (Foidel Creek Water Pipeline Crossing) discharged during the
month of December 2010. The installation of the water pipeline did not occur until the second week of
December 2010, allowing three samples to be collected. No exceedances were noted.
Permit COG-850054 - Outfall 001A (18LT Pond) did not discharge during the quarter.
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Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines