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R'I\C 010'0R.A F I D GEORGE M.L.ROBINSONY.G, <br /> 1.ERICH RAUBERY.E. <br /> PROJECT MEMORANDUM <br /> ��,p,DO Ll�Fy <br /> To: George M.L. Robinson <br /> From: J. Erich Rauber, P.E. i° 26647 <br /> Date: June 1, 2014 �'�'• •'�`� <br /> Subject: MSE Wall Design Revisions FSsioNAtENo�� <br /> This memorandum presents the results of planned design revisions in connection <br /> with the subject project. The project construction drawings present designs for <br /> MSE walls that are a maximum height of 15 feet. Field revisions have resulted in <br /> two conditions not contemplated by the drawings: <br /> • MSE walls up to 20 feet high <br /> • The need to increase the height of a gravity wall from 9 to 18 feet high <br /> Each of these conditions are discussed in the following sections. <br /> MSE Walls 20 Feet High <br /> Increasing the project MSE wall to a maximum height of 20 feet is feasible. <br /> External Stability <br /> Factors of safety follow for each of the following conditions: <br /> Overturning F.S. = 2.3 <br /> Sliding F.S. = 1.5 <br /> Bearing F.S. = 3.4 (Assumes that the ground surface is relatively flat at <br /> least 12 feet on the outboard side of the wall, or bedrock is less <br /> than 18 inches below the bottom of the wall.) <br /> Internal Stability <br /> Reinforcing mats should not be over 18 inches apart. They should consist of <br /> Mirafi 5XT over the lower 10 feet and should be at least 9 feet long; over the upper <br /> "Strategically Positioned—Technically Prepared" <br /> 5555 DTC Parkway Suite A-4000,Greenwood Village,Colorado 80111 <br /> Phone:(303)832-7664 Fax:(303)832-7469 <br />