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C1r. Mark S. Loye -4- October 19, 1982 will be capable of holding an amount of water equal to the product of the depth of soil in inches and t.9e water holding capacity in inches per inch. In the case of the Fort Collins loam, one foot of soil will be able to hold over two inches of water and two inches of water will keep a grass such as western wheatgrass growing well for about a month, long enough to grow and produce seed. Such drought periods in this area during the growing season are quite rare. Therefore, if the soil depth is proper and the precipitation patterns good there is no need to mulch if adapted species are used in the revegetation. 2. Ilorizon separation does not seem to be necessary in these soils. P1ost of the future mining will be in the Fort Collins Loam while past mining has occurred in the Stoneham sandy Loam. No problems have occurred in revegetating the Stoneham sandy loam. The Fort Collins loam is several magnitudes better quality than the Stoneham sandy loam. As indicated in Exhibit E and in the soils information, we do not anticipate any problems with these soils. Actually, the Fort Collins loam, on this site is better than the average Fort Collins loam in that the calcarious layer is much less well developed or even absent in some areas. GJhat little gravel is mixed in the soil as a result of stripping the boundary between mineable material and soil serves to improve the texture of the blocky portions of the soil. Mixing occurs as a result of stripping and redistribution. 3. We agree that stockponds would be of benefit. There are several problems with them however. Nobody can determine wnere they shoulcl.be built until the mine is nearly finished because the final topography will determine to a large extent wi~ere they should go. Also, constructing them might be contrary to the water rights for the area. Recall, this area is effectively in the Arkansas River drainage and the entire drainage is severely over-appropriated. We will agree to building up to three stockponds provided: 1) the land owner wants them, 2) the water rights will permit them, and 3) the final topography is appropriate to building them. Fxhi hit F The final contours shown on the map are conceptual in nature and are not intended to indicate precise locations of contours. Nor would such a "pool table" top- ography be at all appropriate. Please note that each contour connects within each of the two existing pits to another contour of the same elevatia~. Some final irregularity is to be expected. The existing pits were mapped from an aerial photo and the contours therefore show pit slopes, faces, ungraded areas, and stockpiles as well as some large areas of final topography in the bottom of the southwestern pit. F.xhi hit T, Mulching costs are included in the reclamation costs already submitted, .but it only provides for the relatively small amount of mulching planned for south