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Martin Marietta Materials <br />Spec -Agg Project <br />Quarry Wall <br />Slope Direction of Wall( <br />Slope Angle(2) <br />East 242° 45° <br />Northeast 175° 35° <br />Northwest 151° 35° <br />West 091° 45° <br />West 120° 45° <br />Southwest 036° 45° <br />Southwest 016° 45° <br />Southeast 335° 45° <br />Note: 1: Slope orientations are presented as dip directions measured from true north (0 °). <br />2: Slope angles are measured relative to the horizontal. <br />3.3 Friction Angle Estimation <br />A total representative angle of friction (4) + 1) = 33° was used for the wedge stability analysis, where "4)" is the <br />basic friction angle and "P is the surface roughness angle (Hoek and Bray, 1977). The surface roughness <br />angle is the angle between the basic plane of the joint and the planes representing the surface of ripples or <br />undulations of the joint surface. This value was based on the results of the direct shear testing performed as <br />part of the 2003 geotechnical investigation (L &A, 2003). The test results produced only a basic friction <br />angle, 4), and results indicated that the basic friction angle of the discontinuities ranged from 13.7° to 49.3° <br />with a mean value of 28 °. These results do not include the two direct shear tests conducted on samples with <br />clay material along the foliation plane, which produced an average friction angle of 5 °. The surface <br />roughness angle, "P', has been estimated to be 5 °; this roughness angle has been utilized for all of stability <br />analyses since 1997. <br />February 13, 2012 <br />Table 1: Representative Quarry Wall Orientations <br />Page 5 Lachel & Associates, Inc. <br />Project 11361017.00 ©2012 All Rights Reserved <br />