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2011-06-29_PERMIT FILE - C1981019A (21)
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2011-06-29_PERMIT FILE - C1981019A (21)
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Entry Properties
Last modified
8/24/2016 4:34:59 PM
Creation date
8/31/2011 8:36:01 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
6/29/2011
Doc Name
Geotechnical Report South Taylor Excess Fills
Section_Exhibit Name
Exhibit 21 Item 1 -ST
Media Type
D
Archive
Yes
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Attn: Mr. Tay Tonozzi <br />November 21, 2008 <br />Page 2 <br />11%fiddle Drain. The current South Taylor (ST) box cut pit shell is shown on Figure 5. The box <br />cut extends further north than the previous planned pit shell. Therefore the <br />south end of the middle drain has been revised to start at the north boundary of <br />the pit shell where excess spoil begins. <br />East Drain. The downstream endpoint of the eastern drain was constructed south of the <br />original plan. The drain terminates past the boundary of mining for the West <br />Pit. Extending the drain further north is technically not required as the drain is <br />no longer below excess spoil. Spoil dumps north of the end point were arranged <br />to produce spoil sorting to create a layer of coarse rock spoil around the end <br />point.. This allows water from the drain increased area to infiltrate the West Pit <br />spoil located below. In our opinion, the drain end-point is satisfactory and <br />stability of the spoil is not reduced; water carried by the drain should seep into <br />the in-pit spoil that fills the mined area below. <br />HIGHWALL MINING <br />Two areas of highwall mining are planned below excess spoil fills at the locations shown on <br />Figure 5. The highwall mining configurations (web widths, barrier pillar criteria, extraction <br />ratios, etc.) were designed by Agapito Associates, Inc. (AAI) in their report "Geotechnical <br />Design and Operational Considerations for Highwall Mining, West Pit South, F 12 and E2 <br />Seams" (November 23, 2005), and Addendum (April 13, 2007). <br />Iii their report, AAI stated on page 10, "Web pillars are designed to remain stable and preclude <br />s~xbsidence." The planned excess spoil fill is generally confined in a valley and the out-slopes <br />at the downstream toes are relatively flat at 3:1 (H:V). In our opinion, the highwall mining will <br />not significantly affect spoil foundation conditions and should not reduce the global stability of <br />the spoil fill. <br />23-1-01105-200 <br />Exh. 21, Item 1 Revision Date: 11/22/08 <br />Second Intro. Letter - 2 Revision No.: TR-77 <br />
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