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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> Table 6- Summary of Recent Direct Shear Testing <br /> Normal Friction <br /> Depth Cohesion <br /> Boring (ft ) Material Joint Type Stress Angle (psi) <br /> (psi) (deg.) <br /> HDR-002 17.0-17.4 Granitic Gneiss Natural 50/300/900 25.5 21.1 <br /> Fracture <br /> HDR-002 255.5- Granitic Gneiss Natural 50/300/900 36.6 26.9 <br /> 256.0 Fracture <br /> HDR-002 294.7 Qtz Pegmatite Natural 50/300/900 32.7 29.1 <br /> 295.2 Fracture <br /> HDR-002 344.7- Granitic Gneiss Saw Cut 150/300/600 30.2 21.7 <br /> 349.7 <br /> HDR-003 48.5-49.0 Granitic Gneiss Natural 50/300/900 21.4 27.9 <br /> Fracture <br /> HDR-003 130.0- Talc Gneiss Natural 50/300/900 16.3 42.8 <br /> 130.3 Fracture <br /> HDR-003 192.0 Granitic Gneiss Natural 50/300/900 38.2 31 <br /> 192.3 Fracture <br /> HDR-004 66.1-66.3 Granitic Gneiss Saw Cut 150/300/600 30.4 31.5 <br /> HDR-004 121.0- Qtz Pegmatite Saw Cut 50/300/900 25.5 9.9 <br /> 131.0 <br /> 383.0- Hornblende Natural <br /> HDR-004 383.5 Schist Fracture 50/300/900 15.8 31.1 <br /> HDR-005 59.0-59.4 Granitic Gneiss Natural 50/300/900 22.8 26.3 <br /> Fracture <br /> 111.0- Hornblende Natural <br /> HDR-005 111.4 Schist Fracture 50/300/900 32.7 17.2 <br /> 194.0- Talc Gneiss Natural <br /> HDR-005 194.5 with Quartz Fracture 50/300/900 22.6 19.6 <br /> HDR-005 262.8 Granitic Gneiss Natural 50/300/900 29.3 43.7 <br /> 263.0 Fracture <br /> 4.2.2 Aggregate Property Testing <br /> Laboratory testing performed for aggregate property evaluation was performed including LA <br /> Abrasion per ASTM C535, Sulfate Soundness per ASTM C88, and Specific Gravity and <br /> absorption per ASTM D6473. The results of the laboratory testing are summarized in the table <br /> below. <br /> May 2023 1 15 <br />