Page - 115 - in Book of Full Papers - Symposium Hydro Engineering

shear strength data, thin-section petrographic analysis, and x-ray diffraction. These methods are generally described below. Figure 6 - FCO Spillway Recovery geologic exploration program. All the rock-core borings were drilled at least 6 m (20 ft) into fresh, un- weathered amphibolite, with drilling depths that ranged up to about 60 m (200 ft). Each boring was logged in accordance with the project procedures, which included the classification of rock lithology, degree of weathering, discontinuities and infilling, Rock Quality Designation (RQD), and descriptions of other relevant geologic features. 115