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E <br /> MSE Wall Design Revision, Wild Cat Mine Access Road • <br /> June 1,2014 <br /> Page 2 <br /> 10 feet, Mirafi 3XT may be used in lieu of 5XT, and the mat lengths should <br /> progressively increase in length from 9 feet to 12 feet then remain at 12 feet to the <br /> top of wall. <br /> Increasing Height of Gravity Wall <br /> From a geotechnical engineering standpoint, increasing the height of the gravity <br /> wall is feasible, provided the following considerations are addressed: <br /> 1. Extend the wall height by constructing an MSE wall the from the current 7.5 <br /> foot height up to the planned 18 foot height. Use Mirafi 5XT mats. The <br /> upper mat should be at least 13 feet long, the next mat down should be at <br /> least 11 feet long, with 10 long mats the rest of the way down at 18 inch <br /> intervals. <br /> 2. Construct an earthen embankment at least 3 feet high in front of the gravity <br /> wall to provide lateral support. The embankment should be placed, <br /> compacted, and constructed on the same material as that specified for MSE <br /> wall backfill. <br /> 3. Stresses in the wall will concentrate along at the top of the gravity wall and <br /> the new MSE wall above. The wall blocks at 9 feet must be able to resist a <br /> shear force of approximately 8 kips/foot of wall. <br /> If these conditions are not desirable, we recommend that the gravity wall be <br /> removed and an MSE wall designed as described in the preceding section installed. <br /> If you have any questions, please contact me at (303) 210-7575. <br /> 2 <br />