REP10089

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 2/2/1996
• Doc Name: 1995 AHR
• Annual Report Year: 1995
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

• Sanborn Creek Mine 1995 Annual Hydrologic Report
surface water monitoring stations. One method is to utilize a
known culvert size combined with the depth of flow and the velocity
determined by measuring the time it takes a floating object to
travel a known distance. The other method is to time flow into a
bucket of known size. Flow in the North Fork of the Gunnison will
be obtained from the nearby USGS gauging station.
Water samples from groundwater wells H-10 and B-6 are taken with a
bailer that has a restricted inlet. The bailer is weighted so it
sinks to the bottom of the well when it is empty. The water flows
into the bailer slowly so a sample of the water from the bottom of
the well is obtained. It is not possible to purge wells H-10 and
B-6 because they are connected to the flooded mine workings. Water
samples from groundwater wells SC-1, SC-2, and SC-3 are obtained
with a bailer after the wells have been bailed to remove the
equivalent of one volume of water from the wells.
Water samples were analyzed by ACZ Laboratories, Inc. of Steamboat
Springs, Colorado prior to Technical Revision No. 20. Water
samples were analyzed by Commercial Testing & Engineering Co. of
Denver, Colorado after Technical Revision No. 20.
Surface Water Information
• The data collected from the surface water monitoring stations and
laboratory results are presented in Appendix 2.
Surface water monitoring point H-1 is located on Hubbard Creek,
where this perennial stream flows through the permit area
associated with the abandoned Somerset Mine. The only current
activity in this area has been reclamation of the Lower Hubbard
Creek site.
H-1, Hubbard Creek, was monitored in April, June, August, and
October for field parameters. In April and October, the full suite
of surface water parameters in accordance with Technical Revision
No. 20 was analyzed.
Surface water monitoring points S-1 and S-2 are designed to sample
the flow in Sanborn Creek above and below the disturbed area.
Sanborn Creek receives discharge water from the mine. This source
of water will cause Sanborn Creek to flow year around, for a
distance of approximately 300 feet through Culverts under the
railroad and highway prior to discharging into the North Fork of
the Gunnison River.
Monitoring point S-1 flows during spring run-off and significant
precipitation events. The disturbed area and mine water could
affect the quality of water in Sanborn Creek only when there is
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