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4.3 2018 Laboratory Analyses <br /> Laboratory test assignments on selected samples collected by Al in 2018 were based on <br /> GEI's review of rock cores and included direct shear tests on natural joints and saw cut <br /> samples and uniaxial or unconfined compressive strength (UCS; per ASTM D7012, method <br /> Q. A summary of the test results is presented in Table 4-2 and Table 4-3, and laboratory <br /> reports are included in Appendix A.2. <br /> The reported friction angle for granitic gneiss and biotite gneiss was between 21° and 34' for <br /> tests on natural fractures, and the reported friction angle for sillimanitic gneiss was between <br /> 16' and 20°. The UCS was between 3,600 and 33,000 lbs/in2 (psi) for the granitic and <br /> biotite gneiss. The reported friction angle for sillimanitic gneiss was between 16' and 26' for <br /> test on natural fractures and the UCS was between 5,300 and 8,400 psi. <br /> Table 4-2. 2018 Subsurface Explorations: Direct Shear Test Results <br /> Normal Shear Friction Apparent <br /> Borehole Sample Sample Joint Stress Stress angle,cp Cohesion, <br /> ID,, Number Depth(ft) Material Type (psi) (psi) (degrees) c(psi) <br /> Natural 70 58 <br /> M-2-18 1 154-155.3 Granitic Gneiss Fracture 140 100 33.9 8.9 <br /> 280 198.3 <br /> Natural 70 51.9 <br /> M-2-18 5 56-57 Biotite Gneiss 140 65.8 30.8 0 <br /> Fracture 280 173.1 <br /> Natural 70 50.7 <br /> M-5-18 7 129-129.5 Sillimanitic Gneiss Fracture 140 74.4 19.6 25.4 <br /> 280 125.1 <br /> Natural 70 65.2 <br /> M-4-18 9 173-174 Granitic Gneiss Fracture 140 107.7 21.3 44 <br /> 280 150.1 <br /> Natural 70 56.2 <br /> M-4-18 11 193-194.5 Granitic Gneiss Fracture 140 124.3 28.1 31.1 <br /> (Healed) 280 174.6 <br /> Natural 150 162.8 <br /> M-3-18 12 282-283.5 Sillimanitic Gneiss Fracture 300 204.3 15.9 119.7 <br /> 600 290.5 <br /> Natural 150 231 <br /> M-3-18 13 362-364 Sillimanitic Gneiss Fracture 300 256.4 25.8 139.6 <br /> 600 439.2 <br /> 16 <br /> Aggregate Industries-Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit November 2020 <br />