PERMFILE44748

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 8/10/2006
• Section_Exhibit Name: Exhibit 14 Hydrologic Monitoring Plan
• Media Type: D
• Archive: Yes

When water level measurements are obtained for alluvial wells, the water level of the adjacent stream will also be
. detemuned using a staff gauge or other similaz measuring device, except when snow and ice conditions preclude
measurement. The staff gauges have been and will continue to be surveyed following installation, to asswe an
accwate assessment of stream elevation. Staff gauges will be surveyed at three-year intervals, beginning in 2000,
unless physical damage renders the gauge unusable. Typically, surveys will be completed in the spring or eazly-
summer, unless field conditions prevent access.
During the late fall and winter months, snow and ice buildup on the streams or measuring devices may preclude
accwate assessment of stream elevations. Consequently, stream water levels aze generally measured during a
period from late March/eazly-April through September. Water level measwement sites aze listed on Table A,
Hydrologic Monitoring Sites.
For all wells, water levels will be measured using a standard level probe or pressure gauge before pumping or
bailing of the monitoring well or allowing it to flow for period of time. Measurements will be made relative to a
consistent datum, such as the top of the well casing. Wells will be pumped or bailed prior to water quality sampling
to assure that standing water in the well bore is removed; and that representative field readings and water quality
samples can be obtained.
Surface Water, Effluent, and Spring Monitoring
Monitoring Requirements Surface water monitoring will document the quantity and quality of area stream-flows,
discharge from sedimentation control ponds, mine water dischazge, and the quantity and quality of springs.
Monitoring sites and sampling frequencies aze summarized by Table A, Hydrologic Monitoring Sites, and in
NPDES Permits CO-0027154, CO-0036684, CO-0042161, and COG-0072272. Site locations aze shown on Map
13A, Hydrologic Monitoring Plan. Table A specifies two general categories relative to sampling frequency,
"Regular" monitoring that is done continuously, and "Contingent" monitoring that is done only when there is a
discharge from underground mine pumping. Actual timing of sampling may vary somewhat from Table A, due to
weather and site ground conditions.
NPDES Permits Copies of the NPDES permits are included in Exhibits 3 (Volume III), 10 (Volume VIII), and 44
(Volume IIIA). Data from NPDES dischazge points will be included with the Annual Hydrologic Report. Copies
of the Dischazge Monitoring Report are also forwarded to DMG. The NPDES permits establish effluent limitations
for discharges from the following fow areas of the mine:
a) Permit CO-0027154 -Discharge associated with Ponds B, C, D, E, F, and T
b) Pernvt CO-0036684 -Discharge from Pond E at the Fish Creek Tipple
c} Perntit CO-0042161 -Mine water discharge at the Fish Creek Dewatering Facility
d) Permit COG-0072272 -Temporary discharge of excess groundwater inflows from 6NM Shaft
excavation
USGS Stream Monitoring Stations The USGS has established continuous stream-flow monitoring stations along
Foidel Creek. Operation and maintenance of the USGS stations is anticipated to continue through the life of the
mine. TCC may take-over these stations in the futwe, depending upon status of agreements with the USGS.
Rating Curves for Non-USGS Stream Flaw Stations Flow measwements will be determined from stage readings
recorded for a transect at each station, and the corresponding rating curves. The rating curve for each station will
be reviewed twice annually, once in the late-spring or early-summer, and once in the fall. If review indicates that
stream configuration has changed significantly, TCC may survey and generate a revised rating curve, or increase
the frequency ofstream-flow measurements.
MR06-208 Exhibit 14 - 2 07/26/06