REP16265

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 2/2/1995
• Doc Name: 1994 AHR
• Annual Report Year: 1994
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

t Somerset Mining Company
' 1994 Annual Hydrologic Report
are flow, pH, conductivity, and temperature. Equipment and methods
used to measure the field parameters include:
' Depth to water level - A cable marked in increments is lowered into
the groundwater monitoring well until electrical continuity is
' reached at the water surface. A tape measure is used to determine
distances between marked increments.
pH - A Cole Parmer pHTestr 2 pocket-size tester is used to measure
' the pH of a water sample. Published specifications for the pHTestr
2 are range: pH -1.0 to 15.0, resolution: 0.1 pH, accuracy: +/- 0.1
pH, automatic temperature compensation: 0 to 50 degrees C,
' calibration points: 1, 2, or 3. The pH tester was calibrated prior
to sampling events using the 2 point method. The expected pH was
bracketed by the pH of the calibration solutions. In most cases
' the pH tester was calibrated at 7 and 10 which brackets all of the
current monitoring results. If an expected pH is less than 7, the
pH tester will be calibrated at 4 and 7.
' Conductivity - Two Coie Parmer pocket-size testers with different
range capabilities are used to measure the conductivity of a water
sample. Published specifications for the TDSTestr 3 are range: 0
' to 1990 uS, resolution: 10 uS, accuracy: +/- 2~ full scale,
automatic temperature compensation: 0 to 50 degrees C, calibration
with standard solution. Published specifications for the TDSTestr
' 4 are range: 0 to 19.90 mS, resolution: 0.1 mS, accuracy: +/- 28
full scale, automatic temperature compensation: 0 to 50 degrees C,
calibration with standard solution. A single Cole Parmer TDSTestr
20 pocket-size tester with dual range capabilities may be
' substituted for the TDSTestr 3 and/or the TDSTestr 4. Published
specifications for the TDSTestr 20 are range: 0 to 1990 uS with
resolution 10 uS and 2.0 to 19.90 mS with resolution 0.1 m5,
' accuracy: +/- 28 full scale, automatic temperature compensation: 0
to 50 degrees C, calibration with standard solutions. The
conductivity testers were calibrated prior to sampling events with
calibration solutions in the expected range.
Temperature - A standard mercury thermometer which measures
temperature in degrees Celsius is used to measure the temperature
' of a water sample.
Flow - One of two methods is used to determine the flow at the
' surface water monitoring stations.
known culvert size combined with the One method
depth of flow is to utilize a
and the velocity
determined by measuring the time i t 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.
' 2