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highwall will allow the crest to be pushed towards the toe for the final mining slope of 2H:1 V <br /> while maximizing gravel recovery and will reduce the required backfill material to bring the <br /> slopes to a 3 H:1 V slope. Secondly, this offset provides additional slope safety. A failure would <br /> be governed by the internal angle of friction of the material. This would limit the failed slope to <br /> an angle of 34 degrees or—1.3H:1 V. This failure would not only stay within the permit area, it <br /> would stay within the final slope envelope. Such a failure is unlikely given that only the active <br /> slope is near vertical. All mining slope will be 2H:1 V or shallower once they are within 200 feet <br /> of the permit boundary. <br /> The expected annual average production is 10,000 tons. Actual production rates will fluctuate <br /> based on market conditions. The raw material will be sold as crushed rock and sand. A <br /> breakdown of the anticipated product tonnages and mined tonnages can be seen in Table D-1. A <br /> breakdown of the estimated areas is included in Table D-2. <br /> Topsoil will be stored in a berm along the western and southern edges of the property and will <br /> not exceed 20 feet in height or 80 feet in width (214:1 V). Overburden will be stored along the <br /> western edge of the property in berms that will not exceed 30 feet high and 120 feet wide <br /> (21-1:1 V). Both topsoil and overburden may be sold on an as needed basis; however, Yevoli <br /> Cobblestone Inc. commits to keeping enough material onsite to be able to reclaim the site. <br /> Estimates on reclamation required topsoil and overburden will be calculated on an ongoing basis <br /> as reclamation will occur concurrently with mining. Therefore, surplus material estimates will <br /> become readily apparent as mining and reclamation progresses from area to area. The amounts of <br /> topsoil and overburden sold are secondary commodities and are not therefore included in the <br /> table below or the annual tonnage sold from the site. <br /> No pit dewatering will take place, as the groundwater table is below the bottom of the pit. Depth <br /> to groundwater is variable and shallows near the western and northern extents of the site with <br /> proximity to Hard Scrabble Creek. The depth of excavation will be adjusted to avoid exposing <br /> P Y P J P g <br /> groundwater. Three test holes drilled and monitored by the Fremont County Engineer March 26, <br /> 2007 were drilled to a PP depth of approximately 17 feet and no groundwater was encountered at <br /> P Y <br /> this depth. However test pits excavated in 2005 encountered groundwater at roughly 15 feet of <br /> depth. Excavation in the past exposed groundwater and was immediately reburied at depths <br /> Yevoli Cobblestone Pit X and Nssoc.m-,III r< <br /> December 2018 D-2 <br />