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i <br />(3) ~ <br />• locations and orientations of faults with respect to the face of the cliff, <br />~ <br />(4) an assessment of potential rock failures based on: <br /> • relative frequency of open joints and joint intersections, <br />1 • the potential of displaced rock blocks to topple or move on the talus <br /> slope, <br /> • the likelihood of in-place blocks of rock to topple or to slump, <br />(5) locations of previous debris flows and water erosion, and <br />1 (6) proximity of hazards to County Road 27. <br />The factors contributing to failure include: <br />(1) adverse orientation of joints, bedding planes and intersections of joints <br /> and bedding planes <br />1 (2) spacing between joints, bedding and their intersections <br />(3) force of gravity <br />1 (4) ice wedging in closed or open joints and fractures <br />(5) increase in pore water pressure resulting from infiltration of excessive <br />,• rain or snow melt, either along jointlbedding planes or within the cuesta <br />(6) water seeps along the face of the cliff, and <br />(7) local dissolution of the case-hazdened rind or removal by man-made <br /> construction that would allow easier access of incident water to infiltrate <br /> the rocks. <br />The identification of the potential geologic hazards provides a basis for making <br />recommendations to mitigate the hazards. A summary of the hazard zones, engineering <br />geologic characteristics, and expected types of failures is presented in Section 6. The hazard <br />zones and several geologic structures aze shown on Figure 3. <br />1 <br />J • 5 <br />