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evaluates the maximum height of the Gob pile at 150' instead of the original pile height of <br />118 feet. <br />Buckhorn Geotech evaluated the as -built configuration of gob pile #4. It was prepared <br />September 5, 2012. The analysis is based on actual construction of the pile, and utilizes <br />soil parameters as discussed in the original report dated February 1, 2007. The as -built <br />configuration has been determined to be stable. <br />Buckhorn Geotech prepared a stability analysis evaluating the Gob Pile #2 expansion. It <br />was prepared November 9, 2012. The report concludes the pile will be stable with <br />slopes no steeper than 3h:1v with 15' wide terraces on 50 to 60' intervals with the first 50' <br />sloped no steeper than 2.5h:1v. <br />Buckhorn Geotech prepared a stability analysis evaluating gob pile #4 based on DBMS <br />request to evaluate slopes in the as -built configuration with a steepness up to 2h:1v. The <br />pile was found to be stable in the as -built configuration. The report was prepared on <br />November 20, 2012. <br />Buckhorn Geotech prepared a revised stability analysis for the gob pile expansion area. <br />It was prepared July 29, 2013. The report analyzed two sections, A -A' and F -F' and <br />concluded that the pile will be stable with slopes no steeper than 2.5h:1 v with 15' wide <br />terraces on 60' intervals. This revision to the steepness of the slopes is for the area <br />represented by Section A -A' and is not a blanket slope revision for the entire pile <br />configuration. In addition, where gob pile #2 and #4 meet, Buckhorn recommends <br />ripping into existing gob to a minimum of 12" and moisture conditioning by blending new, <br />wet gob with existing gob. Buckhorn recommends keying into existing gob, in alternating <br />layers. <br />Huddleston Berry Engineering & Testing (HBET) prepared a stability analysis dated <br />March 18, 2014 to analyze a temporary drying area on top of gob pile #2. Gob will be <br />end dumped in piles that will be a maximum of 20' high with 1.5H:1V side slopes. A25' <br />buffer zone between the face of the gob pile and the end dumped gob will be maintained <br />at all times. <br />Huddleston Berry Engineering & Testing (HBET) prepared a stability analysis dated <br />October 1, 2014 to demonstrate the weight of the coverfill pile west of the haul road on <br />gob pile #2 does not compromise the overall stability of the gob pile. <br />Huddleston Berry Engineering & Testing (HBET) prepared a stability analysis dated <br />September 19, 2014 to demonstrate the weight of the coverfill pile east of the haul road <br />on gob pile #2 does not compromise the overall stability of the gob pile. <br />MR -171 -18- 01115 <br />