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Year 2 - 2010
<br />Boreholes Drilled Total Borehole Total New Pad Total New road
<br />
<br />LW
<br />17
<br />O1A Depth Disturbance Construction
<br />-
<br />-
<br />, O1B, O1C, 2, 3, 4, 20,805 feet 4.0 acres 4
<br />825 feet
<br />5, 6, 7, 8 ,
<br />LW-18-O1 B, O1 C, 2, 4, 5, 6, 7, 21,450 feet 3.5 acres 3
<br />175 feet
<br />8 ,
<br />i oiai 42,255 feet 7.5 acres 8,000 feet (2.9 ac.)
<br />Year 3 - 2011
<br />Boreholes Drilled Total Borehole Total New Pad Total New road
<br /> Depth Disturbance Construction
<br />LW-19-0113, O1C, 2, 4, 5, 6, 7, 22,600 feet 4.0 acres 5,250 feet
<br />8, 9.
<br />LW-20-0 IA, 013, 01C, 3, 4, 5, 23,300 feet 4.0 acres 6,550 feet
<br />6,7,8,9
<br />1 otai 43,yuu teet 8.0 acres 11,800 feet (4.3 ac.)
<br />Note that the eventual extent of mining of panels LW-18, LW-19 and 20 will be contingent upon
<br />the results of the initial pilot holes completed in 2009.
<br />Total anticipated additional drill pad disturbance is 26.0 acres and temporary road disturbance is
<br />15.7 acres for a total of 41.7 additional acres over a three year period. A modified Table 2.05.4-
<br />T1, Surface Disturbance Summary on PAP page 2.05-50a is attached herein.
<br />Each borehole will be drilled 12 '/4 inch diameter to approximately 20 feet above the coal. 9 5/8
<br />inch steel casing is cemented into the hole to approximately within 100' of the coal. 7 inch
<br />slotted steel casing will be installed to within 10 feet above the coal. Approximately 60 - 100
<br />feet of the slotted 7 inch pipe will be extended up or overlap into the 9 5/8 inch casing.
<br />Drainage and Sediment Control
<br />The drainage and sediment control system for these Elk Creek mine gob vent boreholes will be
<br />consistent with the previously constructed Elk Creek Mine and Sanborn Creek. Mine gob vent
<br />boreholes. The drainage and sediment control for the Elk Creek Mine borehole sites will be _
<br />managed as a small area exemption with alternative sediment control provided by a combination
<br />of perimeter sediment control berms/ditches and installation of straw bales, straw waddles or silt
<br />fence, etc. to reduce flow velocity and trap sediment. To facilitate the control of upland
<br />drainage, if the site is suitable, an upland clean water diversion will be constructed to reduce
<br />overland flow into the effected area. Permit Map 2.05-M4 (4t' sheet) Drainage and Sediment
<br />Control Plan provides a typical example of a drill pad lay out. Exhibit 2.05-E3, Drainage and
<br />Sediment Control Plan, Section 9, Revised and New SAE's and Alternative Sediment Controls
<br />provides typical designs and demonstrations for alternative sediment control and clean water
<br />ditch scenarios. Exhibit 2.05-E3, Drainage and Sediment Control Plan, Section 6 contains
<br />information regarding mudpit hydrology demonstrations.
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