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2004-12-07_PERMIT FILE - C1984063
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2004-12-07_PERMIT FILE - C1984063
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Last modified
8/24/2016 3:16:10 PM
Creation date
2/19/2008 1:35:17 PM
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Template:
DRMS Permit Index
Permit No
C1984063
IBM Index Class Name
Permit File
Doc Date
12/7/2004
Section_Exhibit Name
Rule 2.04 Environmental Resources
Media Type
D
Archive
No
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<br />Hydrology - Modeling. The mathematical model AQUILIS was used to <br />perform calculations in the analytic solutions of confined and <br />unconfined flow to the mine area. The mine boundary was <br />approximated as a series of various types of sinks appropriate to <br />the hydrogeologic conditions. The calculated flows are a function <br />of mine shape, extent, and the time period the mine has been open. <br />The model also calculates the distance of zero influence for <br />confined conditions and the distance to the point where each flow <br />becomes unconfined. <br />The mine was modeled as a single rectangular area with <br />hydrogeologic boundaries on all sides. A "no flow" boundary exists <br />to the north due to the limit of saturation as the limit of the <br />aquifer is reached. Experience to date is that the inflow follows <br />the entry advance. East of the modeled area no boundary was <br />determined so the model did not limit the distance of influence in <br />this direction. The south boundary was also treated as a no flow <br />boundary with the distance to this boundary a function of the dip <br />on the potentiometric surface and the coal seam. By contrast the <br />western boundary was treated as a constant head or recharge <br />boundary where the seam subcrops under the alluvium of Harvey Gap. <br />The mine progression for the first 50 days is above the level of <br />the subcrop so it was modeled as a single line sink. Once the <br />subcrop level was reached the mine area was defined as a series of <br />five sinks. The mine area is triangular in shape with the mine <br />entry slanting away from the Harvey Gap subcrop. However, the Iine <br />sink with recharge equation assumes that the recharge is <br />perpendicular to the axis of the sink. Therefore, the mine area was <br />approximated by a rectangular area so that the western edge is <br />perpendicular to the subcrop. This edge was defined as a line sink <br />with recharge (Sink #1, LR). The main axis of the mine parallel to <br />strike was a line sink moving down dip (Sink #3, LD) so the mine <br />progression and flow from the mined coal are accounted for. The <br />eastern edge was defined as a line sink with no boundaries (Sink <br />#5, L). Well sinks account for radial flow at each corner of the <br />mine area (Sink #2 and 4, W). <br />The modeling inputs and results are presented on Table 10: Modeling <br />Inputs and Results (located in Appendix F) and Figure 15: Ground <br />Water Modeling Results. Inflow to the mine continues to rise <br />through the five year mine (permitted area) <br /> <br />61 Technical Revision 12 3/21/95 <br />
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