2011-09-30_PERMIT FILE - C1980007A ‎(6)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 9/30/2011
• Doc Name: Boring Logs
• Section_Exhibit Name: Exhibit 82 Appendix A
• Media Type: D
• Archive: Yes

Barr Engineering Company
4700 West 77th Street
BARR Minneapolis, MN 55435 -4803 LOG OF BORING B -6
Sheet 2 of 3
Project: Proposed RPE Expansion
Location: West Elk Mine, Somerset,
CO
client: Mountain Coal Company
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Barr Project Number: 06/261003
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STANDARD PENETRATION
TEST DATA
N in blows /ft 0
10 z0 30 40
NATURAL DRY
DENSITY
(pcf) it
105 115 125
MATERIAL DESCRIPTION
(ASTM D2488)
SHEAR STRENGTH, ksf
Op X UC A TV X
VS A VSR O
1 2 3 4
Water Content, %
Wp WN WL
20 40 60
6535
6530
6525
6520
6515
30
35
40
45
50
55
60
SHALE Light tan - medium brown shale with coal dust seams.
14%
44%
48%
54%
CLAY (CL -CH) Light -dark tan clay with silt. 32.6
SHALE Tan shale with coal dust seams. 35.7
CLAY (CL -CH) Grey clay with silt. 41.5
SHALE Tan shale. 44.0
CLAY (CL -CH) Dark grey clay with silt. 45.0
SHALE Light -dark grey fine grained friable shale. 45.7
----------------------- - - - - --
SHALE Grey shale interbedded with sandstone. 51.5
SANDSTONE Light grey /grey fine to medium grained sandstone 53.5
with minor tan rusting and brown clay seams no more than 2"
thick.
Continued Next Page
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Completion Depth: 74.5
Date Boring Started: 6/20/09
Date Boring Completed: 6/22/09
Logged By: BSE
Drilling Contractor: Haztech
Drilling Method: HSA/CORE
Northing- 402144.6
Eastin 1450500.2
Remarks:
SAMPLE TYPES
WATER LEVELS
m Auger Cutting 'Shelby Tube
® Split Spoon n Rock Core
While Drilling:
End of Drilling.
hrs After Drilling:
The stratification fines represent apprwamate boundaries. The transition may be gradual.