PERMFILE107555

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 12/5/2005
• Section_Exhibit Name: Tab 17 Probable Part 2
• Media Type: D
• Archive: No

TABLE 1730
SUMMARY OF AQUIFER CHARACTERISTICS
Hydraulic Hydraulic
Aquifer Conductivity Storativity Gradient
Ift/day) IfY/ft1121
Wadge Overburden 0.01"' 102 0.20
Wadge Coal 0.01 "' 10'2 0.19
Sage Creek Overburden 0.0015 "' 4x10A131 0.22
Sage Creek Coal 0.01 10'2 0.21
Wolf Creek Overburden 0.0015131 4x10° "~ 0.20
Wolf Creek Coal 0.001'^' 10511 0.18
"' II-W Permit, Tab 17-1
'~' Exhibits 7-2A, 7-26, 73A, 736, 7-4A, 7-46
13j Yoast Mine Permit, Tab 7, Table 7-9
16j II-W Permit, Tab 7, Table 7-8
to 10-7, which are quite low for an unconfined aquifer. A Storativity value of 10-2 was used for
the Wadge overburden pit inflow analyses. Available hydrogeologic information presented in
Section 17-1 (existing permit Seneca II-W PHC) was used to estimate the Wadge coal aquifer
Storativity value (10-2). The Sage Creek overburden Storativity value is assumed to be similar to
what was observed in Yoast Mine Wadge underburden (4x10-6). This value is also used for the
Wolf Creek overburden Storativity value. The Wolf Creek coal Storativity value (10-5) is also
based on aquifer test results from the Yoast Mine. Since there are no aquifer test results for the
Sage Creek coal, the conservative value of 10-2 was used for the Sage Creek coal aquifer
Storativity value.
Estimates of the Wadge overburden and coal ground water inflow are presented in Table 1731,
Annual Pit Inflow Volumes for Wadge Overburden and Wadge Coal Aquifers. Table 1731a,
Annual Pit Inflow Volumes for Sage Creek and Wolf Creek Overburden and Coal Ground Water
Systems, presents the ground water inflow estimates for the Sage Creek and Wolf Creek mining
area. These estimates were prepared assuming that the total inflow would be derived from the
interception of premining flow rates under a natural hydraulic gradient and the drainage of
ground water from storage in the water bearing units. Data available were insufficient for
completion of the McWhorter (1982) analysis performed for the Seneca II-W mining area in the
original permit (see Section 17-11. Therefore, a simplistic, analytical approach was used which
will present aworst-case scenario (i.e., liberal pit inflow estimated. Pit inflow calculations are
based on the following equation (Freeze and Cherry, 19791
88 Revised 1/02