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REP02129
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REP02129
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Entry Properties
Last modified
8/24/2016 11:32:59 PM
Creation date
11/26/2007 10:10:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
11/1/1980
Doc Name
Landslide Study
From
Geo-Hydro Consultants
Permit Index Doc Type
STABILITY REPORT
Media Type
D
Archive
No
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10 <br /> <br />' i', 3.2 MINE BENCH AND MINE ENTRIES <br />I <br /> <br />' ~' Apart from the access road, the proposed mine bench and <br />~ <br />i <br />t <br />i <br />i <br />h <br />i <br />l <br />i <br /> ne en <br />! m <br />r <br />es compr <br />se t <br />e s <br />e, most <br />ng <br />mportant structure <br /> ~i located within the landslide area. It is also located within the <br />1 I~ <br />I' upper slide portion, immediately below the steep slope where most <br /> I' instability features have been observed recently. <br />1 ~~ <br />~~ <br /> i; The mine bench will require a sizable excavation to obtain <br /> ~i the space for the operation; a long portal cut will have to be <br />' excavated for five tentatively proposed mine entries. The entries <br /> In are spaced 100 feet center to center, and the total length of the <br />' bench will exceed 400 feet if all entries are constructed <br /> . <br /> The configuration of the mine bench and the location of the <br />I <br /> II portal cut are not known at this time (October, 1980). The analy- <br />t ;; ses and recommendations of this report are based on our own ten- <br /> ~, tative design of the mine bench and the mine entries portals as <br /> ~I it is shown on Plates 1 through 6. The design is based on the <br />' assumption that the mine bench elevation coincides approximately <br /> with the bottom of the coal seam; portal cuts have been designed <br />' so that their height does not exceed 15 feet. <br />L~ <br />' Topographic, geologic, and hydrologic conditions are shown <br />', in profiles along individual entries, Plates 2 - 6. The profiles <br />show the probable boundary between the soils of the slide deposit <br />and intact bedrock; parts of the tunnels south of this boundary <br />t ~~ will be driven in soils while tunnel portions north of the bound- <br />ary should reach coal. The profiles also show where the ground <br />water level was measured on October 8, 1980 in individual piezo- <br />' meters and borings located close to the profile. <br />' i The profiles show that both entries 1 and 5 are located in <br /> unfavorable topographic conditions as they approach the steep <br />' - slope above. the relatively flat natural bench. Entry 5 is lo- <br />~.o«.o.o ~«~.~..~ <br />1 <br />
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