2012-08-03_PERMIT FILE - C1981012 ‎(4)‎

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 8/3/2012
• Doc Name: Design Recommendations for the Proposed West Portal Development Waste Rock Disposal Area ‎(DWDA)‎
• Section_Exhibit Name: Exhibit 43
• Media Type: D
• Archive: No

April 16, 2012
In -Situ Moisture Density
Page 8
Table 2 summarizes the results of in -situ density testing. Moisture density tests were
performed on samples retrieved from inside the SPT sampler with the brass liners.
Table 2. Summary of Laboratory In -Situ Moisture Density Test Results
Sample ID
Sample Depth
Natural Moisture Content
Dry Density
Moist Density
Boring
(ft bgs)
( %)
(lbs /ft)
(lbs /W
BH -38
5.75
13.6
91.2
103.6
BH -38
16
9.7
118.2
129.7
BH -39
6.25
21.6
99.1
120.5
BH40
5.75
11.4
118.4
131.9
BH -40
11.25
12.5
118.9
133.8
BH41
6.25
7.9
100.1
108.0
BH -41
10.5
4.9
118.0
123.8
Point Load Testina
Samples of the sandstone bedrock were tested by the point load test to determine shear
strength properties. Point load test results are summarized in Table 3. The information provided
in Table 3 was further reduced in order to determine appropriate shear strength parameters used
in the slope stability analysis.
Table 3. Summary of Laboratory Point Load Test Results
Shear StrengLh Testing
Shear strength properties of the DWDA subgrade materials were determined on relatively
undisturbed portions of the samples extruded from the brass liners at the respective in -situ
moisture and density. Due to the nature of the materials obtained from the existing DWDA pile,
re- molded direct shear tests were conducted on the material passing the #4 mesh
(4.76 millimeters [mm]) screen. The development waste samples were re- molded to 90% of the
Agapito Associates, Inc.
Uncorrected Point
Corrected Point
Boring
Sample Depth
Load Index, I,
Load Index, Is(so)
UCS
(ftbgs)
(psi)
(psi)
(psi)
BH -41
11.5 -14.5
216
195
4,097
BH -41
11.5 -14.5
764
565
11,874
BH -41
11.5 -14.5
132
107
2,245
BH -41
11.5 -14.5
213
167
3,510
BH -41
15.5 -20.5
11
10
217
BH -41
15.5 -20.5
178
167
3,496
BH -41
15.5 -20.5
76
71
1,490
BH -41
15.5 -20.5
167
158
3,318
BH -41
15.5 -20.5
123
86
1,804
BH -41
15.5 -20.5
977
630
13,221
Shear StrengLh Testing
Shear strength properties of the DWDA subgrade materials were determined on relatively
undisturbed portions of the samples extruded from the brass liners at the respective in -situ
moisture and density. Due to the nature of the materials obtained from the existing DWDA pile,
re- molded direct shear tests were conducted on the material passing the #4 mesh
(4.76 millimeters [mm]) screen. The development waste samples were re- molded to 90% of the
Agapito Associates, Inc.