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• Still, the rate of extraction was so rapid it shortened the anticipated life of <br /> the mine by nearly 10 years, or nearly 50 percent of the anticipated <br /> timeline. <br /> • The rate of extraction simply outpaced mining methods intended to <br /> maintain concurrency of finished slope establishment, essentially doubling <br /> the needed volume to complete the finished slopes. <br /> • The rate of extraction was also compounded by labor shortages and <br /> equipment breakdown due to the increased demands on this resource. <br /> • A chart of our estimated volume requirements was created based upon an <br /> updated revised map, included with this submittal. <br /> • Warranty cost estimate determined by field examination and supplemental <br /> data and comparison with the warranty calculations provided at the time of <br /> the permit by the OMLR, are included with this correspondence to support <br /> that the values determined and reflected here are reasonable. <br /> The included Map is enlarged at 1 inch = 100 feet to better reflect the <br /> measurements and locations of features utilized to determine fill volumes needed <br /> to bring the basin slopes to a 3H:1V grade. Existing slope configurations are <br /> identified on the included chart and determined using the following information: <br /> Tract C: <br /> 1. Has conservatively a 1.75H:1V slope with an apx. 35.5± feet of vertical <br /> depth from the bottom of the soil profile until it hits an underlying 3H:1V. <br /> The perimeter extent (in Orange @ elevation 4624') on the Grading Plan <br /> Map - excludes the southern boundary where existing grade, while <br /> rough, is a 3H:1V or flatter in general. Refer to Chart for measurements. <br /> 2. The apx. line of beginning of the 3H:1V slope (in Green @ elevation <br /> 4589') extends apx. 15.0± feet of vertical depth from the bottom of the <br /> 1.75H:1V slope to the basin bottom (Green Hatch area); for a total basin <br /> depth of 50± feet. <br /> Tract D: <br /> 1. Has conservatively a 1.50H:1V slope with an apx. 32.0 ± feet of vertical <br /> depth from the bottom of the soil profile until it hits an underlying 3H:1V. <br /> The perimeter extent (in Orange @ elevation 4619') on the Grading Plan <br /> Map includes the entire basin boundary. Refer to Chart for <br /> measurements. <br /> 2. The apx. line of beginning of the 3H:1V slope (in Green @ elevation <br /> 2152') extends apx. 13.0± feet of vertical depth from the bottom of the <br /> 1.75H:1V slope to the basin bottom (Green Hatch area); for a total basin <br /> depth of 45± feet. <br /> Varra Companies, Inc. Western Sugar Project 2 <br /> OMLR Permit M-2010-049 Technical Revision - 26 November 2018 <br />