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2015-12-11_PERMIT FILE - C1981008 (2)
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2015-12-11_PERMIT FILE - C1981008 (2)
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Last modified
8/24/2016 6:13:18 PM
Creation date
1/5/2016 1:17:22 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981008A
IBM Index Class Name
Permit File
Doc Date
12/11/2015
Doc Name
Mine Facilities
Section_Exhibit Name
Section 2.05.3(3) Table of Contents & Mine Facilities
Media Type
D
Archive
Yes
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j. The Northeast Perimeter Haul Road is also in the disturbed area and therefore <br />should not need to meet the design criteria of Rule 4.03.1(3), however, since the <br />area has been reclaimed, an alternative demonstration to the design criteria of <br />Rule 4.03.1(3) is given below. <br />K. Alternative Demonstration to the Design Criteria of Rule 4.03.1(3) for the Northeast <br />Perimeter Haul Road <br />This demonstration is written by Greg Lewicki, P.E., with over 28 years of coal mine haul road <br />design, construction, permitting, and reclamation experience. <br />The plan view and profile of the road on Map 2.05.3(3)-8 The Northeast Perimeter Haul Road <br />was first started in 1993. At that time, the road was installed from Station 0+00 to approximately <br />Station 30+00. In subsequent years, as mining continued to the west, the road was also extended <br />west to its crossing of 2700 Road, which was started in the year 2002. The total road length is <br />6600 feet. The road was installed by the following sequence: <br />1. stripping topsoil from the surface area <br />2. placement of 1' to 2' of compacted fill in lifts adequate for good compaction (using heavy <br />loaders and dozers) and then compacted further with heavy mine trucks <br />3. placement of 4" of gravel on the surface which was then compacted with very large mine <br />trucks <br />Although no compaction tests were made of the minor fill, I firmly believe that the compaction is <br />adequate for its intended use for the following reasons: <br />1. The fills are less than 2 feet high and in most cases, they are less than 1 foot high. <br />2. The heavy equipment in use at this mine site is capable of producing tremendous <br />compaction in small lifts or even 1 foot lifts. <br />3. Most of the overburden material used in the fill has a good mix of sand, silt and clay <br />which normally achieves an excellent compaction. This is supported by the excellent <br />strength testing done on the overburden material for the sediment pond stability analyses. <br />See Attachment 2.05.3(3)-15 for details of the strength properties of the overburden. <br />4. The mine haul trucks which have used the road produce an extremely large point load on <br />the ground surface, further improving the compaction. <br />Page 2.05.3(3)-26 October 2015 (TR -69) <br />
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