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REP40746
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REP40746
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Last modified
8/25/2016 12:38:30 AM
Creation date
11/27/2007 8:49:42 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
Report
Doc Date
3/5/1992
Doc Name
1991 AHR text and data
Annual Report Year
1991
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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<br />reestablished. However, the majority of the 1988 season was spent developing <br />a stage rating curve for the channel cross section with flow measurements <br />being taken on a sporadic basis rather than in conjunction with water quality <br />sampling periods. Instantaneous flow measurements were taken during 1989 in <br />conjunction with water quality samples taken at TR-D, except for the October <br />sampling period. Between the sampling periods of September and October in <br />1989, beaver activity both above and below TR-b occurred causing the location <br />of TR-B to become part of an inundated beaver pond. High flows, in part due <br />to beaver activity, destroyed the staff gauge at TR-b in 1990 and again in <br />1991. As a result, no instantaneous atreamflor data was-collected in 199D~ <br />while 1991 had one measurement in May. As such, it is doubtful that this <br />location or any location along the downstream portion of stream channel near <br />the permit boundary can be retrieved from the beavers and used as a flow <br />monitoring station. <br />S+ fa Wa O+al; v <br />The general characteristics: temperature (Figure 1), pH and specific <br />I conductivity (Figure 2) exhibit the same trends as found during the baseline <br />studies. Temperature follows the seasonal trend established during baseline. <br />However, it is interesting to note that the period of record does appear to <br />suggest a general warming of the creek waters. Trout Creek remained alkaline <br />throughout the year with slight variations in pH occurring seasonally. <br />Specific conductivity shows the same trend through the September 1990 sampling <br />date as the baseline studies. All four sites exhibited a marked increase in <br />specific conductivity in October 1990 and August-October 1991 readings. As TDS <br />values do not reflect these increases, it is believed that these data <br />excursions can be attributed to equipment errors with the Horiba instrument <br />rather than a reflection of actual field conditions. After the October 1990 <br />' reading, the equipment was repaired and used until July 1991, when a <br />' mechanical malfunction required switching to another Horiba instrument. It is <br />believed that the second Horiba was improperly calibrated, resulting in <br />inaccurate readings. <br />Total Dissolved Solids (TDS) concentrations in Trout Creek show the <br />expected pattern of levels increasing as stream flow passes the mine area and <br />then beginning to decrease downstream with the introduction of inflow from <br /> <br />
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