REP13113

• Permit No: C1980004
• IBM Index Class Name: Report
• Doc Date: 1/31/2006
• Doc Name: 2004 AHR Review Memo
• From: Dan Mathews
• To: Sandy Brown
• Annual Report Year: 2004
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

a STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman SL, Room 215 C Q I, Q IZl~ I~ Q
Denver, Colorado 80203 o t v I s t O N o f
Phone: [phone] fVt. I N & !~ L $

FAX: [phone] G E O L O G Y
0.EClA MATION•M INING
SAf ETY•SCIENCE
DATE: January 31, 2006
Bill Owens
TO: Sandy Brown cGVemGr
Russell George
FROM: Dan Mathews Executive Director
Ronald W. Cattany
RE: 2005 AHR for McClane and Munger Canyon Mines Division Director
Permit No. C-80-004 (McClane) and C-81-020 (Munger) Natural Resource Trustee
I have conducted a preliminary review of the 2004 AHR for McClane and Munger Canyon Mines.
I need to request assistance from a staff hydrologist, to conduct the PHC review. Jim Burnell has
conducted the reviews in the past. Monitoring appears to have been conducted in conformance
with the approved plan, with the exception of certain apparent discrepancies associated with
CDPS permit reporting. Precipitation was significantly higher than average during the water year,
and higher than it has been in recent years. East Salt Creek flows were higher and TDS levels
lower than in recent years. Operator was able to obtain data from the ephemeral drainages of
McClane Creek and Munger Creek during the year, which is not always the case.
McClane
McClane Creek Temporary Diversion
Based on survey information presented in last year's AHR, a technical revision was submitted
and approved to install a new culvert "P" at the road crossing on lower McClane Creek, which will
re-direct the creek away from the eroded diversion segment that was created when the road was
constructed across the channel prior to August 3, 1977. The culvert will reestablish the original
flow path of McClane Creek, and will result in flow down McClane Creek entering East Salt Creek
downstream of the haul road bridge, rather than upstream of the bridge.
Minewater Inflow/Discharge
Relevant data is included in Table 1, and comparison to PHC projections is provided in the
narrative. Of note is the fact that reported inflow of 31.5 gpm is the highest inflow reported since
coal production resumed in 2000; it is approximately twice as high as inflow reported for last year,
and over 150% of the projected inflow predicted in the PHC in Appendix N of the permit
application, when projection assumptions are adjusted for "actual" coal production of 300,000
tons per year rather than "worst case' coal production of 1.7 million tons per year. Historically,
reported minewater TDS levels have been lower than average TDS values reported at SW-1, the
upstream monitoring site on East Salt Creek. Based on values reported in the 2005 report,
minewater discharge TDS was slightly higher than average TDS values at Site SW-1. This
appears to be due to the lower stream TDS values associated with elevated stream flows.
Ground Water Sampling
• Required quarterly monitoring data for Wells GW-1 and GW-3 (water level and field
parameters) were provided.
• CDPS mine water discharge sampling data were reported in CDPS discharge reports (see
Permit System records, not required to be included in AHR). One item of note is that the
Office of Office of Colorado
Mined Land Reclamation Active and Inactive Mines Geological Survey