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Martin Marietta Materials <br />Spec -Agg 2015 Annual Report <br />reported, the overall effective angle of the last three benches of the north pit walls has been modified to <br />an angle of 350, which is consistent with the 2003 Lachel geotechnical evaluation (L &A, 2003). The <br />failure surfaces (i.e., the surfaces along which movement has occurred) remain at a "residual strength" <br />and therefore are less resistant to additional loading. Although the slope configuration is currently stable, <br />the failure mechanism could potentially be reactivated, resulting in movement of additional material. The <br />northern wall slopes should continue to be visually monitored for indications of instability. <br />February 25, 2015 Page 7 Lachel & Associates, Inc. <br />Project 14364006 00 02015 All Rights Reserved <br />