_GENERAL DOCUMENTS - C1981017 ‎(289)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
of COS
Department of Natural Resources
O
1313 Sherman St., Room 215 * •)
Denver,CO 80203 "
Phone.[phone] *�g76
FAX:[phone]
Roy Romer
Governor
Michael Long
Division Director
DATE: November 11, 1993
TO: Steve Renner, Tony Waldron, IAfry Routten
FROM: Harry Posey 91f
g"
hemistry data Mid-Continent
RE: Review of Water
Resources
INTRODUCTION
At your request I have reviewed the some of the water chemistry
data for the Mid-Continent mine and segments of the Crystal River.
As requested, I have examined the data to see if there are
indications of degradation of water quality that might affect
aquatic life in the Crystal River or in Coal Creek. In particular,
I have examined the data for water quality variations that might
indicate contamination from the now-flowing adit which was allowed
to flood recently, and whether there are other previously-
undetected inidications of contamination related to other
parameters.
APPROACH
From an initial inspection of the information I found no obvious
indications of water quality degradation. The data examined
include:
1 . Annual Hydrology Reports submitted by Mid-Continent
2 . Geochemical analyses submitted with the Annual Hydrology
Reports
3 . Report of analyses dated 10/6/93 from CDS Laboratories
4 . USGS data for the Crystal River and environs .
Owing to the concern for aquatic life in the Crystal River, I
relied heavily on analyses of water from Coal Creek at station #20 .
This is the downstream most sampling below the mine that has been
evaluated on a routine basis, and as such should offer a fair
indication of the overall variations in water quality that may be
traced to mining. I examined, but did not dwell on groundwater
quality.