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4. Laboratory Analyses <br /> 4.1 Pre-2017 Laboratory Analyses <br /> Laboratory testing was performed on samples collected during the 2005, 2007, 2007 to 2008, <br /> and 2011 subsurface exploration programs to evaluate samples for LA Abrasion, Micro <br /> Deval, moisture density relationships, unconfined compressive strength with Young's <br /> Modulus, direct shear on joints and saw cuts, and slake durability. <br /> 4.2 2017 Laboratory Analyses <br /> Laboratory tests were performed on selected samples collected by Al in 2017. The samples <br /> were selected based on GEI's review of rock cores and included direct shear tests on natural <br /> joints and saw cut samples. A summary of the test performed is presented in Table 4-1 and <br /> laboratory reports are included in Appendix A.2. <br /> The reported angle of internal friction (�)for granitic gneiss and biotite gneiss was between <br /> 14' and 35' for tests on natural fractures and between 19' to 25' for tests on saw cut <br /> samples. The reported friction angle for sillimanitic gneiss was between 15' and 48' for the <br /> test on natural fractures, and 29' for the test on a saw cut sample. Note that each of the <br /> laboratory reported friction angles has an associated apparent cohesion value. <br /> 14 <br /> Aggregate Industries—Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit November 2020 <br />