_REPORT - C1980007

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Name: ANNUAL HYDROLOGY REPORT MT GUNNISON NO 1 MINE WATER YEAR 1989
• Annual Report Year: 1989
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

HYDROLOGIC MONITORING ACTIVITIES
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The hydrologic monitoring program at the Mt. • Data from monthly water level and water
Gunnison No. 1 Mine began in 1974 with the quality measurements at two wells com-
completion of several groundwater observation pleted in the "B" seam coal.
wells. This preliminary monitoring network was
expanded considerably and in 1981, with the • Data from measurements of mine water
approval of the Mt. Gunnison No. 1 Mine, Mining discharges, and mapping of inflow loca-
and Reclamation plan(M and R Plan),became the tions.
"approved" hydrology monitoring program.
In 1984, 1987, and 1989 the program was revised. SURFACE WATER
The 1984 and 1987 revisions were made to more MONITORING
efficiently monitor possible effects from mining
and provide data for future permitting. The 1989 West Elk Coal Company's (WECC) surface water
revision incorporated provisions for the collection monitoring program includes nine monitoring
of "B" seam baseline data and monitoring for locations (Table 1). The locations of these moni-
potential mining impacts in anticipation of the toring stations are shown on Exhibit 1. Daily flow
1990 opening of the "B" Seam. All revisions were estimates (including mean, maximum, and mini-
approved by the Colorado Mined Land Reclama- mum flows) for the five WECC gauges are summa-
tion Division (CMLRD). rized in Appendix A.Except for stations with a few
mechanical problems, the records are complete.
The 1989 Annual Hydrology Report contains the
following: TABLE 1 Summary or Surface Water Moni-
toring Program at the Mt. Gun.
• • Data from five continuous flow monitor- nison No. 1 Mine
ing stations;
• Data from two U. S. Geological Survey Station Flow Water Quality
(USGS) continuous flow monitoring sta- Sylvester Gulch Continuous 3 times per year
lions; USGS/WECC Gaging
Station Continuous 3 times per year
• Data from seasonal water quality sampling Fast Fork Minnesota
at two Surface water quality monitoring Creek Flume Continuous 3 limes per year
Lowcr Dry Fork Flume Continuous 3 limes per year
stations; Upper Dry Fork Flume Continuous 3 times per year
Lick Creek Flume Continuous 3 limes per year
• Data from seasonal measurements of pH, North Fork Upper 3 times per year
temperature, dissolved oxygen, turbidity, North Fork Lower 3 times per year
and conductivity at the six stream gauging USGS North Fork
gaging station
stations in the Minnesota Creek Basin and
near Somerset Continuous --
Sylvester Gulch;
• Data from seasonal measurements of
discharge and water quality sampling at Stilling wells at the five WECC gauges began
seven springs issuing from or below the freezing in late November. By the end of Decem-
"F' seam coal; ber all were frozen. By mid March all stilling wells
had thawed. Debris buildup in the flumes was
• Data from seasonal water level and water minimal during 1989 and no data were lost due to
quality measurements at 19 wells; and debris.
•
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