REP28782

• Permit No: C1980001
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: 1994 AHR text and data
• Annual Report Year: 1994
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

I. INTRODOCTION
RECEIVED
FEB 2 7 1995
~~ The purpose of this report is to provide updated
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for the Edna Mine and
~ discuss trends in surface and ground water quality which have become
1 evident over the past decade. The previous report, dated March 1994,
reported monitoring activities up through the end of 1993. This report
discusses data for parameters which have been collected on an on-going
basis from the period beginning in January 1984 through December 1994.
The report is divided into several sections including: Hydrologic
Monitoring Network; Surface Water; Ground Water; Surface Water - Ground
Water Interactions; Quality Assurance; Annual Spring and Seep Survey; and
Moffat Stability. A compilation of the raw data is provided in the
Appendices
.
II. HYDROLOGIC MONITORING NETWORA
The present monitoring network is a modification of the network used
during baseline monitoring. The modifications are mostly simplifications
justified by the monitoring records from 1976 through 1987. Continuous
streamflow records are made for Trout Creek above the mine (TR-a) from May
through October (periods of freezing sometimes necessitate the records to be
of shorter duration). Instantaneous streamflow was recorded on Trout Creek
below the Moffat mining area at TR-b prior to July 1994. During June 1994,
a continuous streamflow recorder was installed at TR-b. Therefore,
monitoring data subsequent to June 1994 is provided on the continuous
schedule as at TR-a. Surface water samples are collected above and below
the mine at TR-A and TR-D, respectively. Additional surface water sampling
~: sites along Trout Creek are TR-B (upstream of the active mining area and
downstream of the West Ridge area) and TR-C (located adjacent to the active
' mining area). Sampling at TR-C was started in April of 1985 in anticipation
of mining the Moffat area. Ground water Levels and samples are collected
from three wells completed in the alluvium along Trout Creek (TR-1.5, TR-3
~~' and TR-4) and from a spoils well (WR-1) located at the base of the West
Ridge area. Additional ground water levels are collected from six wells
~' (215W, 215L, 218W, 218L, 8925 and 892L) located in the Moffat area.
' 1