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MINING PLAN <br /> conveyor will transport the material to the processing plant on the west side of Academy Boulevard. <br /> Rarely are trucks used to haul mined material and that is usually when the conveyor is being repaired <br /> or being relocated to a position closer to the actual mining. <br /> The difference in the Little Johnson area though is that the depth of mining will rapidly <br /> decline as the mining proceeds to the east. Cross-section LJ-1 (at the end of this exhibit) shows that <br /> mining will ultimately stop at about five feet above the clay seam separating the upper and lower <br /> water zones. Of course, the question is, how do you know when you are five feet above the clay seam <br /> when you can't see the clay seam? <br /> That depth is determined by the moisture in the sand. Throughout most of the sand profile the <br /> sand is generally dry to very slightly moist. As the water table is approached though the sand rather <br /> quickly becomes more moist. As has been the case in the past, the mining stops when the sand <br /> becomes moist,which is quite readily evident. <br /> At that time, mining will not proceed any deeper into the deposit. Mining deeper would <br /> expose the water and create a very wet spot or even a gentle stream. But if one waits a few days to a <br /> couple of weeks the sand becomes dry again. At that point, if the sand is of sufficient quality, an <br /> additional few feet of sand can be removed. Once again, the mining stops when the sand becomes <br /> If this process was repeated several times, more sand could be removed. Unfortunately, this <br /> process also results in a declining recovery of additional sand because the drying of the surface takes <br /> longer to occur, the thickness of the dry sand layer becomes less and less, and the probability of a <br /> permanent exposure of the groundwater increases. Therefore, it is a requirement that no more than <br /> one additional sand layer removal CAN BE REMOVED after encountering the first moist <br /> sand. is allowed. Doing one additional removal of sand after first encountering the moist sand does <br /> not adversely affect the remediation program,would not expose groundwater, and would probably <br /> have a rate of sand recovery that would be worth the effort. Additional lifts would most likely be so <br /> thin they would not be worth acquiring. Within the existing pit area this has been tested and found to <br /> be true in actual practice. <br /> In summary, the maximum depth of extraction will be to either: <br /> 1.) the first encounter with the moist sand above the water table or, <br /> 2.) if the sand is still favorable, one additional lift of dried sand down to the next <br /> moist sand layer. <br /> No additional sand may be removed beyond one additional lift. Either one of those two surfaces will <br /> be the final grade of the west facing slope. <br /> As will be addressed further in the Reclamation Plan,this is not the final reclamation surface. <br /> The actual final reclamation surface will be higher than the final mining surface as a result of the <br /> redistribution of the soil removed from the top of the profile (the former bottom of the reservoir). <br /> Daniels Sand Pit Amendment (2008) Exhibit D Page 15 of 28 <br />