2010-04-16_PERMIT FILE - C1996083

• Permit No: C1996083
• IBM Index Class Name: Permit File
• Doc Date: 4/16/2010
• Doc Name: Overburden Stability Reports, Maleki Technologies, March 2004 & January 2010
• Section_Exhibit Name: Volume IIIA Exhibit 16 Stability Evaluation of Terror Creek Crossing
• Media Type: D
• Archive: No

Tablet— Deere's engineering classification for intact rock.
Class
Description
Uniaxial compressive strength, psi
A
Very high strength
>32,000
B
High strength
16,000- 32,000
C
Medium strength
8,000 - 16,000
D
Low strength
4,000 -8.000
E
Very low strength
<4,000
On the basis of modulus ratio
Class
Description
Modulus ratio
H
High modulus ratio
>500
M
Medium modulus ratio
200 -500
L
Low modulus ratio
<200
The point load tests complemented the uniaxial compressive strength results by providing
additional data in a cost - effective manner. Because many of the axial point load tests
were obtained very close to where measurements of uniaxial compressive strength were
collected, it is possible to correlate test results. As illustrated in figure 5, the data is
scattered around a one -to -one ratio line. There is a fair correlation between point load •
and UCI test results with linear regression coefficient (R) of .61.
Uea n Axel PoiW Load Strer th
Y�
3
.moo � noon xao
Figure 5. Uniaxiat compressive strength vs. axial point -load test results. •
Maleki Technologies, Inc. Page I5