PERMFILE51632

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 9/13/2005
• Section_Exhibit Name: 2.04 Environmental Resources
• Media Type: D
• Archive: Yes

t ...time of dewatering days
The total inflow per (longwall panel) section of the mine or level is then calculated from:
Q = q x 1
where: 1 ... length of dewatered section (m)
The total horizontal inflow per (longwall panel) section of the mine or level was calculated using hydraulic
conductivity that ranged from 0.034 to 0.098 ft/day. The geometry of the mined area and time of dewatering are
based on the mining plans. The analytical equation presented above was input into a simple spreadsheet computer
program (LOTUS 123) on an IBM computer. The results of the inflow calculations for the Eastem Mining District
are summarized and presented in Tables 3 and 4 of Exhibit 9A. The average inflow in one panel could range from
65 to 230 gpm and the total inflow in the Eastern Mining District could range from 110 to 601 gpm.
The geology of the Eastem Mining District is similar to the previously permitted areas. A syncline axis, oriented
northwest-southeast is located in the central section of the mined area. The southeastern edge of the proposed
mining is defined by a split in the Wadge Coal Seam. Additional exploration boreholes will be drilled in this area
to better define the coal seam composition.
The Eastern Mining District area sedimentary strata are not disturbed by any significant faults. The structural and
lithologic characteristics of the permit area are depicted on Geologic Cross Sections B-B' (east-west) and D-D'
(north-south), Figures 1B and lA, respectively. These figures are considered confidential.
EMD (Panels 2 Right through 6 Right)(PR 97-04)
The mine inflow predictions were generated using a different methodology than was used for the EMD. The
discussion and calculations are presented in Section 2.05 of this application. The methodology used amirror-well
technique, which should be adequate for predicting inflows into the mine.
NORTHERN MINING DISTRICT (PR 99-OS)
The mine inflow predictions were generated using a different methodology than was used for the EMD. The
discussion and calculations are presented in Section 2.05 of this application. The methodology used amirror-well
technique, which should be adequate for predicting inflows into the mine.
NMD (Panels 17 Right through 21 Right) (PR 03-06)
The mine inflow predictions were generated using a different methodology than was used for the EMD. The
discussion and calculations are presented in Section 2.05 of this application. The methodology used amirror-well
technique, which should be adequate for predicting inflows into the mine.
(2) The use of approved modeling techniques may be included as part of the Hermit application, but
the same surface and eround water information may be required for each site as when models are not used.
RESPONSE
Modeling of geologic conditions has been utilized to predict subsidence potential; the results of the
modeling are set forth in Exhibit 7, Subsidence Predictions. Overburden stratigraphy, uniaxial
compressive strength and tensile strength, angle of draw, caving, and flexure characteristics have been
modeled using methods described in the Subsidence Engineer's Handbook (NCB Mining Department,
1975).
PR 03-06 2.04-11 03/02/04