PERMFILE52847

• Permit No: C1981028
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: GROUND-WATER RESOURCES STUDY
• Section_Exhibit Name: ASH DISPOSAL PLANS APPENDIX A
• Media Type: D
• Archive: No

46
Comparison of the EC values in
Table 6 with those for the overburden
water samples in Table 3 shows that
the .existing dissolved. solids concen-
tration is greater than that in the
Table 6, EC and pH of Saturated
Extracts (Composite samples
from Cores)
Core No. pH EC @ 25°C
mmhos/cm
83 7.8 4.3
65 7.7 6.9
101 7.6 6.7
j
•
saturated extracts, Based on the previous experience which suggests that
spoil water will contain dissolved solids concentrations between 1 and 2
times that in saturated extracts and that the existing waters are already
in this range, no appreciable further degradation of water quality is
anticipated as the ground water passes through the spoils. Therefore,
the quality of pit inflow should be nearly that shown in Table 3 for
overburden waters. As previously noted, the water quality is such that
the usefulness is probably limited to dust control or other non-agricul-
turaTror domestic use. Furthermore, the quantity of inflow is likely to
be too small to be effectively concentrated and used.
V.. Post-t4ining Hydrology and lJater Quality
A. Post-Mining Flow Patterns and Hydrology
FolloYiing the termination of mining, there will exist a period during
which the spoils will tend to resaturate and water levels rise toward the
pr•cmining values. We have no viable computation procedure for estimating
the recovery time. ,Experience suggests that water levels will probably
recover substantially within about 3 years following the termination of
mining. In any case, recovery time is of little importance since no use
of overburden waters presently exists.
Recovery of water levels in the stream deposits in Ennis Draw is a
mare important consideration since there exist wells completed in these
deposits in the vicinity of the proposed mine. Again, it is not possible

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