REP24211

• Permit No: C1980001
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: 1990 AHR text and data
• Annual Report Year: 1990
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

reestablished. However, the majority of the 1988 season was spent developing
a stage rating curve for the channel cross section with flow measurements
being taken on a sporadic basis rather than in conjunction with water quality
sampling periods. Instantaneous flow measurements were taken during 1989 in
conjunction with water quality samples taken at TR-D, except for the October
sampling period. Between the sampling periods of September and October in
1989, beaver activity both above and below TA-B has occurred causing the
location of TR-B to become part of an inundated beaver pond. As such, it is
doubtful that this location or any location along the downstream portion of
stream channel near the permit boundary can be retrieved from the beavers and
used as a flow monitoring station. High flows during the summer of 1990
destroyed the staff gage at TA-B, resulting in no streamflow data being
collected.
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The general characteristics: temperature (Figure 1), pH and specific
L conductivity (Figure 2) exhibit the same trends as found during the baseline
studies. Temperature follows the seasonal trend established during baseline.
However, it is interesting to note that the period of record does appear to
suggest a general warming of the creek waters. Trout Creek remained alkaline
throughout the year with slight variations in pH occurring seasonally.
Specific conductivity shows the same trend through the September 1990 sampling
date as the baseline studies. All four sites exhibited a marked increase in
specific conductivity during the final sample collected in October 1990. it is
believed that these data excursions can be attributed to equipment error with
the Horiba instrument rather than a reflection of actual field conditions.
The equipment has since been repaired.
Total Dissolved Solids (TDS) concentrations in Trout Creek show the
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then begins to improve downstream with the introduction of inflow from
I undisturbed areas downstream of the active mine. In reviewing the TDS
concentrations shown in Figure 3, the trend noticed during the baseline
studies is further demonstrated. Peak TDS levels in Trout Creek occur in
early spring prior to the period of peak flow. This is caused by the uptake
c