REP08850

• Permit No: C1980001
• IBM Index Class Name: Report
• Doc Date: 8/2/1995
• Doc Name: 1994 ANNUAL HYDROLOGY REPORT REVIEW EDNA MINE C-80-001 MOFFAT STABILITY CONCERNS
• From: DMG
• To: SUSAN BURGMAIER
• Annual Report Year: 1994
• Permit Index Doc Type: STABILITY REPORT
• Media Type: D
• Archive: No

-.
III IIIIIIIIIIIII III
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmem of Natural Resources
1313 Sherman 51., Rooin 215
Denver, Colorado 80203
Phone: [phone]
FA%~ 1303) 832-8106
Date: August 2, 1995
To: Susan Burgmaier
From: Kent Gorha ~~r
CC: David Berry
Larry Routten
RE: 1994 Annual Hydrology Report Review,
Moffat Stability Concerns
Roy Romer
Governor
lames S Lochhead
F.ecmrve Direcor
Michael B Long
Division Director
Edna Mine, #C-80-001,
I have completed review of the.1994 Annual Hydrology Report (AHR)
for the Edna Mine. The monitoring frequency review was conducted
shortly after receipt of the AHR in late February of this year.
Subsequent to that review, NOV C-95-009 was issued to the operator
for failure to conduct spoil spring monitoring as per the approved
plan. Other thatn the spoil spring problem, the monitoring
frequency requirements were met. At that time no water quantity of
quality analysis was conducted. Below please find my comments or
concerns with regard to water quantity and quality at the Edna
Mine.
Surface Water
1. General water quality shows an increasing trend in dissolved
constituents due to mining from upstream to downstream on
Trout Creek. Dissolved iron and manganese show high levels
during periods of heavy runoff but typically fall back to
acceptable levels during low flow. Total dissolved solids
show an increasing trend since 1990 at site TR-D while the
upstream site TR-A data reveals a constant TDS level over the
same time period. Increased spoil spring activity is likely
the cause of this trend. It is worthy of note that the
highest recorded TDS value at TR-D was measured in July of
1994 at 1076 mg/1. TDS increases are well within the
predictions outlined in the Probable Hydrologic Consequences
section of the approved permit.
2. There is no evidence currently that the Edna mine impacts
surface water quantity in the vicinity of the mine.
Ground water
~`~
~~~~~
DEPARTMENT OF
NATURAL
RESOURCES
1. Alluvial wells generally show an increasing trend in TDS from
upstream to downstream monitoring locations. TDS levels are