2011-05-12_PERMIT FILE - M2011028 (2)

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IV. PROPOSED MATERIAL USAGE Since Borrow Area B will be the primary source for pervious embankment materials, this area will be developed to provide necessary quantities of processed filter and drain materials, pervious and semi-pervious shell materials, and material for coarse-grained soil cement slope protection. Relatively minor amounts of material could also be used to provide the small amount of concrete aggregate, gravel for roadways, and riprap for erosion protection. It is anticipated that some form of material processing will be necessary to produce the required pervious embankment materials. The production of filter sand, gravel drain material, concrete aggregate, and gravel for roadways will require significant processing to produce.the typical Reclamation gradations that • will be specified. The natural material is lacking the appropriate amounts of sand-size particles to produce both filter and drain materials through simple separation. It also contains an average of 28 percent (by weight) oversize materials (plus 3- inch) and 10 percent nonplastic to slightly plastic fines. Pit- run material can provide the required pervious and semi-pervious shell materials using seperation to remove the oversize. Minor amounts of plus 24-inch material would have to be removed. Soil cement aggregate can be produced with separation processing to remove the plus 1-1/2-inch material. Riprap for erosion protection of minor.structures will likely be produced from the oversize material separated during the production of processed sand and gravel. • Weeminuche Construction Authority P.O. Box AA - Towaoc, CO 81334 A?JtrnAS GCAuE2Z 6QAVEL 14 Cr_(4 tit) IT .s - P4GC X.22