HYDRO20428

• Permit No: C1981016
• IBM Index Class Name: Hydrology
• Doc Date: 4/23/1984
• Doc Name: REDUCTION IN MONITORING WESTERN SLOPE CARBON HAWKS NEST MINE
• From: MLRD
• To: DAN MATHEWS
• Permit Index Doc Type: CORRESPONDENCE
• Media Type: D
• Archive: No

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DEPARTMENT OF NATURAL RESOURCES
David H. Getchee. Executive Director
MINED LAND RECLAMATION DIVISION
DAVID C. SNEITON, Director
Richard D. Lemm
Governor
DATE: April 23, 1984
T0: Dan Mathews /~~`'~'~~,
FROM: Roy l.. Cox ~v ,~
RE: Reduction in Monitoring, Western Slope Carbon, Hawk's Nest Mine
III IIIIIIillllll III
I have reviewed Western Slope Carbon's Annual Hydrologic Monitoring report and
monitoring reduction request. Given the temporary cessation of mining at the
Hawk's Nest Mine, a reduced monitoring of the effects of mining is justified.
However, prior to the resumption of any further underground mining at the
site, the company must resume full scale monitoring. The following monitoring
reductions may be made during cessation.
1. Mine inflow studies may be ceased during temporary cessation. However,
prior to resuming mining an inflow study should be conducted for all
accessible areas of the mine.
2. For springs located above the mine, measurements of spring flow rates
should continue on a monthly basis for the period from May through October.
The measurements of water quality may be discontinued permanently for these
springs above the mine.
Springs located below the mine should be monitored monthly for flow, pH,
electro-conductivity and temperature.
3. The monitoring of the slurry disposal area within the mine may be
discontinued during temporary cessation of mining. This monitoring should
resume prior to resumption of mining.
4. The monitoring of ground water quality of the Hotchkiss Disposal site
may be discontinued permanently. The natural ground water quality of the
Mancos Shale and the water quality from the Hotchkiss Dump are for poorer than
that potentially produced by the mine wastes.
5. Western Slope Carbon should continue submitting an annual hydrologic
report. This report should consist of a summary of data collected between
October 1 and September 30 (a water year) and submitted by January 1. The
next annual report would consist of data from the period October 1, 1983 to
September 30, 1984 and due on January 1, 1985.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30'x) 866-3567