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Mining in Phase 2W is an extension of the mining that has already been completed in Phase 1W. The material to be mined here is mainly a coarse gravel layer that often occurs under the sand deposit elsewhere. Erosion of the Fountain Greek watershed removed the sand deposit from this area exposing the gravels or at least leaving it near the surface. These gravels are an important resource. They can be mixed with the sand to produce products with certain specifications. Mining of this gravel was previously described under Technical Revision Nl. Essentially, an area of about two or three acres is selected. Th .Coil, if present (and there often isn't any), is removed and stockpiled. Usually using a loader;l gravel is excavated and hauled directly to the processing plant in Phase 4W. When the water table is reached, the excavation stops. In this area, this is usually about 15 to 25 feet below the original surface, but it can vary. The vertical and horizontal location of the water table in this area is extremely variable, and water isn't encountered in some places. Once the gravel has been extracted in each mined area, reclamation begins. For a detailed description of the reclamation, please see Exhibit E, Reclamation Plan. In general, washing fines are pumped back into the excavation to fill it to within a few feet of the original surface. This is then covered with overburden and/or soil, and revegetated. Prior to completing one excavation, often the neat and adjacent excavation is started. Although this leaves a ridge of gravel between the two excavations, the gravel lost is insignificant. This method of removal is more efficient than excavating the entire phase all at once. It also helps to limit the amount of disturbance to only a few acres at a time rather than having a large amount of acreage severely disturbed all at once. Mining in Phases 3W and 4W is nearly completed. The material mined here is sand and in al! areas it is mined by the same method. Phase 3W was previously included under Castle • Concrete's Sand Pit permit, but has now been incorporated into this permit. In Phase 3W the only remaining sand is located in the southwest and southeast corners of the phase. These two areas compose the remains of the dike of sand that formerly separated the two operations. That sand dike was removed under the 1985 amendment to this permit and the former Castle Concrete Company Sand Pit permit. The volume remaining is quite small and should be completely mined out in a year or two. In Phase 4W the remaining sand primarily occurs along the west side of Academy Boulevard. Although most of this send is actually in the highway right of way, Transit Mix has an agreement with the Colorado Department of Transportation (formerly Colorado Department of Highways) to extract this sand. The agreement provides for Transit Miz to pay the Colorado Department of Transportation for each ton of sand removed from the right of way. The Colorado Department of Transportation is aware of how the sand will be removed and what will remain. Transit Miz is required to reclaim the land affected in the right of way. The description of that reclamation is included in Exhibit E (Reclamation Plan). • West of Academy Mining Plan Page D-3