2012-07-02_REPORT - C1980007 (3)

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West Elk Mine 2011 Annual Hydrology Report 40 in the well is measured to the nearest 0.01 -foot, using a Solinst or Heron brand electronic well sounder. The static water level is always recorded as the distance below the top of the inside well casing (btoc), unless otherwise specified. Water samples are collected from the groundwater monitoring wells with a point source bailer. A point source bailer is lowered to a selected depth in the well (usually the center of the screened interval) in order to collect an undisturbed sample from that zone. The monitored wells are not bailed prior to sampling because of their very slow recharge rates. Field water quality parameters are recorded and water samples are processed and sent to the certified laboratory for analysis, as described above. The underdrain monitoring program protocols include measuring and recording flow and field water quality (pH, EC, and temperature), and collecting laboratory samples for analysis. Flow rates are measured using the timed volumetric method described above. The protocols for recording field water quality and processing the underdrain samples for laboratory analysis are the same as described above for surface water monitoring. The temperature monitoring program protocols include monthly visits to the data logger monitoring stations to verify that the loggers are functioning properly, to download data, and to ensure that the loggers are submerged and in the shade when possible. The temperature data loggers are downloaded to a laptop computer on a monthly basis, except when access is prevented by excessive ice or by dangerously high flows. June 2012 HydroGeo, Inc.