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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> Table 7—Summary of Aggregate Testing <br /> Sulfate <br /> Depth Absorption Specific <br /> Loss by Soundness <br /> Boring (ft.) Material GravityAbrasion <br /> � � �%� (%) Sieve Percent <br /> Passing <br /> 245.0- Granitic 3/8 3.9 <br /> HDR-002 260.0 Gneiss 0.75 2.697 18 <br /> #4 8.1 <br /> 185.0- Granitic 3/8 9.4 <br /> HDR-003 195.0 Gneiss 0.41 2.69 21 <br /> #4 15.1 <br /> 121.0- 3/8 21.6 <br /> HDR-004 1310 Pegmtatite 0.38 2.675 30 #4 27.2 <br /> HDR-005 61.0-71.0 Gneiss Granitic 0.8 2.675 38 3/8 67.4 <br /> #4 67.5 <br /> .0 186 - 3/8 41.2 <br /> HDR-005 196.0.0 Talc Gneiss 0.75 2.679 32 <br /> #4 48 <br /> �.2.3 Petrographic Analysis <br /> In order to better understand the existing rock materials at the Morrison Quarry, HDR selected <br /> samples for petrographic testing. Testing included a review of mineral properties (including <br /> frailty and hardness of mineral grains) by preparing a polished slab of the sample. Following <br /> preparation of the slab, a thin section was prepared in order to view the samples under a <br /> petrographic microscope equipped to provide magnification between 20-1000x. Upon <br /> completion of the first round of petrographic analyses, a second round was performed which <br /> included X-ray diffraction (XRD) analyses, to better estimate the clay mineral portion of the <br /> sample. The results of the analyses are summarized below, and the full mineral assemblage <br /> breakdown is included in Appendix A, Subsurface Exploration Findings. <br /> May 2023 1 16 <br />