Laserfiche WebLink
very well, but this sand is especially difficult to compact. This air can provide a cushion that can <br />absorb shock, allows easy drainage, and produces only slight crusting when on the surface. For <br />masonry sand this type is especially favored. Angular sand can be used as masonry sand but it does <br />not produce a grout seam that is as smooth and tight as that produced by more rounded sand. <br />Approximately 90% of the masonry sand in the Denver Metropolitan Area comes from this site. <br />Furthermore, much of that sand is also bagged by Rio Grande Materials and shipped around the <br />country. Often a bag of masonry sand purchased from a building supply store, even hundreds of <br />miles from Denver, contains sand from this site. Unfortunately, there are few places where this <br />type of sand is readily available and it is important that this source remain viable for as long as <br />possible. Undoubtedly similar sand is located elsewhere in this area, but similar large, high quality <br />deposits have yet to be found. <br />Future reclamation -Future reclamation may superficially look very much like the past <br />reclamation. That is, from a distance, the reclamation will look similar. In fact, though, future <br />reclamation will contain many approaches and techniques that will produce a very different <br />functional character. First, slopes will be more gradual than in the past. Second, minor drainages <br />will be patterned to mare closely match the natural pattern of minor drainages in prairie landscapes. <br />Blending of reclaimed land into adjacent undisturbed land will be more gradual thus eliminating <br />sharp changes in topography. Topsoil replacement will sometimes be done without intermediate <br />stockpiling. This will greatly aid in the quality of the revegetation. The revegetation, especially on <br />the upland areas, will strive to produce an assemblage of species that are characteristic of native <br />short-grass prairie. In the past, seed mixtures were designed more for rapid cover rather than <br />natural prairie character. <br />Many of those areas have shifted more toward a natural character as a result of die-off of <br />introduced species in the severe drought of 2002 and 2003. The message here is that if one expects <br />a long-lived, persistent vegetation it is best to use native grassland species rather than introduced <br />species. <br />On lower elevation areas between the hillsides and the riparian corridor a grassland <br />vegetation will be established that is more robust than is presently there. This will act as a sediment <br />filter to help protect the riparian corridor from excessive siltation. This will help the stream <br />corridor become more vegetated rather than being a sand clogged channel. <br />Throughout the affected land, noxious weed control will be implemented according to a <br />strict plan that will interface with the Land Board's overall plan and the weed control efforts by <br />other lessees. (See definition of noxious weed in Weed Control Plan in Exhibit E.} <br />-iii- <br />