2001-12-11_REPORT - C1980001

• Permit No: C1980001
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: AHR text and data
• Annual Report Year: 1989
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

also reached steady state. The equilibrium of WR-1 is further evidenced
through the surface expression of a spring on the lower portion of West Ridge
near the elevation of Trout Creek.
Ground Water Quality
Comparisons of water quality data gathered from the alluvial wells at the Edna
Mine must be exercised with caution due to the differing stratigraphic units
' intersectted along Trout Creek adjacent to the various wells. The alluvium in
the vicinity of Well TR-1.5 intersects stratigraphy above the Wadge coal seam
while the alluvium in the vicinity of TR-3 intersects stratigraphy below the
Wadge seam. Alluvium in the vicinity of TR-4 intersects even lower
stratigraphic units than those at TR-3. The influence from contact with the
differing lithologies is not able to be quantified, therefore, differences
' between the wells may not be responses to mining related activities.
The general characteristics: temperature (figure 9) and pH (Figure 10) show
the expected trends with temperature exhibiting typical seasonal fluctuations
and px remaining constant over the monitoring period.
Specific conductivity (Figure 10) values for the three alluvial wells have
remained fairly constant over the period of record and consistent with values
obtained during the baseline studies. Conductivity values during 1989 for the
' spoils well WR-1 begin with elevated levels caused by the leaching of various
elements continuing within the unconsolidated spoils aquifer as flow passes
through. It is believed the lower values recorded during mid-summer represent
' a flushing of the dissolved constituents with an increase being experienced as
the flow through the spoils lessens and the in place water stagnates. The
trend noticed in specific conductivity is also apparent in all of the major
cations and anions. The spring (NPDES discharge point No. 006) associated
' with the spoils aquifer would be expected to have similar values as evidenced
by comparable TDS concentrations. TDS values (Figure 11) closely follow the
specific conductivity for all the wells, as expected.
' Calcium (Figure 11) is the major cation found in all the wells with
concentrations of magnesium (Figure 12) and sodium (Figure 13) occurring in
' lesser quantities. TR-1.5 generally contains the lowest concentrations of
cations with a slight increase occurring downstream at TR-3 and TR-9. It is
1
LJ