HYDRO22234

• Permit No: C1981047
• IBM Index Class Name: Hydrology
• Doc Date: 12/23/1985
• Doc Name: C-047-81 QUARTERLY HYDROLOGIC BENCH MONITORING DATA
• From: BLUE RIBBON COAL CO
• To: MLRD
• Permit Index Doc Type: OTHER GROUND WATER
• Media Type: D
• Archive: No

-=-.

blue
ribbon
coal
company
Susan Mowry
Reclamation Specialist
Colorado Mined Land Reclamation
1313 Sherman Street, Room 423
Denver, CO 80203-2273

DEC 2 31985
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blue ribbon coal company
P, O, Box 1352
Palisade, CO 81526
December 20,1985
Re: File # C-047-81, Quarterly hydrologic bench monitoring data
Dear Susan:
The following is the last q uarter's hydrologic data from the monitoring points
related to the mine bench stabilization. The North subdrain was accidently
covered during the recent construction. The foot or so of cover is not expected
to adversely affect its ability to drain but will prevent monitoring until spring
when it can be re-established. A fourth piezometer was installed 11-7-85 on
the top edge of the bench. This piezometer, P-4, is located near the new stab-
ility monument S-6 and was installed to a depth of 42'.
North subdrain
Date 9-27-85 10-29-85 11-26-85
Flow(gpm) trickle trickle obscured
pH 8.0 7.2
Conductivity 1450@8oC 1450@9oC
Middle subdrain
Date 9-27-85 10-29-85 11-26-65
Flow(gp~) none none trickle
pH 7.0
Conductivity 1390@4°C
South subdrain
Date 9-27-85 10-29-65 11-26-85
Flow(gpm) trickle trickle 1.5
pH 8.1 8.0 8.2
Conductivity 2600@12°C 2610@8°C 1200@5°C
Bench piezometers
Date 9-27-85 10-29-85 11-26-85
P-1 20.1 21.6 20.6
P-2 49.1 47.6 49.6
P-3 36.7 32.1 40.3
P-4 22.6(11-7-65) 20.3