2008-05-01_REVISION - M1973007SG (5)

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MINING PLAN moist sand which would result in essentially no or very little sand recovery being possible. In effect, at some point along a west to east line across the reservoir site,possible sand recovery will decline to essentially zero. Based on water table depths derived from monitoring wells it appears that point is a about 100 feet east of the upper water zone extraction wells. It might extend somewhat further east, , but that does not appear —likely yddue to decreasing water table depth and increasing soil depth. �a0'' The actual�amount of soil to be removed cannot be determined as that is regulated by the �+ point at which comparatively clean sand is encountered. In the western portions of the Little Johnson area that depth is probably no more than a few feet,but as the extraction moves eastward this depth is likely to increase to several feet. As described in the soil information, it is likely that some of the fines that accumulated on the bottom of the reservoir, over time,worked their way down into the underlying sand thereby contaminating it and rendering it difficult to wash into a marketable product. Once again, it is not known how deep this infiltration(illuviation) actually extended but it undoubtedly occurred to some extent.- Stockpiling of the soil will occur in the southwestern corner of the Little Johnson area(see Exhibit LJ C-4). It is likely that silt fencing will be needed along the east side of the stockpile area to prevent sediment from entering the wetlands east of the stockpile. This stockpile location was selected and designated at the request of the landowner. to anticipate possible future uses of t! material for construction of their . Stockpiling at this location provides for a versatile future j use of the soil in the event the final reclamation must change before the reclamation described in f Exhibit E is implemented. During the soil and overburden removal it is important to monitor the underlying material as it is exposed to watch for a rapid moistening of the exposed material. In f effect, soil removal depth is ultimately regulated by the same criteria that regulates the mining: when moist material is encountered removal must stop. The wide zone between the expected mining limit and the affected land boundary is intended to provide locations for temporary soil stockpiling (before moving the soil to the stockpile area) and for equipment access to the eastern portions of the mining area. Protection for the stockpiled topsoil is required. The stockpiles should have side slopes not steeper than 2:1 (the less steep the better). After stockpiling is completed and the piles have been graded, the following seed mixture will be spread on the soil. Although weed growth is likely to be abundant and provide excellent protection, it is desirable to have some of the species that will be used in the final revegetation also growing on the soil stockpiles. This will build an additional seed bank in the soil that can add to the success of the final revegetation. Daniels Sand Pit Amendment (2008) Exhibit D Page 13 of 28