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
under the roadway, and then into Elk Creek. The sample point will
now be at the end of the culvert.
On February 21, and March 9, 1995, during snow-melt events, samples
were obtained for SAE-10. The area protected by this SAE is the
Lower Hubbard Creek ventilation facility area. No facilities were
remaining. Run-off from the yard was contained by a berm. A silt
fence was installed at the low point in the yard. Run-off from the
yard was either contained by the berm or filtered by the silt
fence. A pipe with the silt fence at its inlet drained water from
the bermed area. The sample point was the discharge end of the
pipe. This area was reclaimed during 1995. Results of the
analysis are included in Appendix 2.
These samples were in compliance with the limitations stated above.
No other samples were obtained during regular site inspections of
SAE sample points and spot checks during storm events.
Surface water monitoring points U-1 and C-1 are designed to verify
that the underground mine does not have an adverse effect on the
quality or quantity of run-off in the unnamed drainage or Coal
Gulch which are both ephemeral streams. Monitoring results are
expected to be similar to those collected in 1981 and 1982.
U-1 was monitored monthly, with no flow recorded in any month. C-1
was monitored monthly, with flow recorded in March, April, May,
June, and July. In March and June, the quarterly full suite of
surface water parameters was analyzed.
Surface water monitoring points NF-1 and NF-2 are designed to
sample the flow in the North Fork of the Gunnison River above and
below the Sanborn Creek Mine disturbed area. Monitoring results
are expected to be similar to those collected in 1981 and 1982 and
further, no significant difference in quality is expected between
the upstream and downstream monitoring points.
NF-1 and NF-2 were monitored quarterly, in March, June, September,
and December. The quarterly full suite of surface water parameters
was analyzed for each monitoring event. On January 30, 1995, the
Colorado School of Mines, Division of Environmental Science and
Engineering issued the final report, "Aquatic Impairment Study of
the Sanborn Creek Mine Discharge, Somerset, Colorado." A copy of
the report is included as Appendix 3.
Colorado School of Mines was contracted to conduct an aquatic
impairment study for the Sanborn Creek Mine requested by the
Colorado Department of Health. The purpose of the study was to
investigate possible impacts of the mine discharge on the aquatic
habitats and organisms of the North Fork of the Gunnison River.
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