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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> Table 8— Summary of Petrographic Analyses <br /> Thin <br /> Boring Sample Section Rock Type <br /> Depth (ft.) Depth <br /> (ft.) <br /> HDR-002 106.0- 106.4 Intermixed Granitic Rock with Muddy Sedimentary Material <br /> 106.6 <br /> HDR-002 112.0- 112.1 Intermixed Granitic Rock and Quartzite with Sandy Sedimentary <br /> 112.4 Material <br /> HDR-002 225.0 225 Biotite Gneiss <br /> 225.6 <br /> HDR-003 53.0-53.6 53.2 Biotite Gneiss <br /> HDR-003 284.0 284.2 Biotite-Chlorite/Serpentine-Talc Gneiss <br /> 284.5 <br /> HDR-004 66.4-67.0 66.2 Biotite Gneiss <br /> HDR-004 383.0- 383.2 Tal-Biotite-Hornblende Schist <br /> 383.9 <br /> HDR-005 115.0- 115.1 Chlorite-Biotite Gneiss <br /> 115.7 <br /> HDR-005 191.0- 191.5 Biotite Gneiss <br /> 191.8 <br /> HDR-G1 Surface -- Gneiss with Intermixed Sedimentary Material <br /> HDR-G2 Surface -- Biotite-Muscovite-Kaolinite Gneiss <br /> May 2023 1 17 <br />