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<br /> <br />' very gravelly sandy loam. <br />surface of this unit. <br />T880161 <br />Rock fragments makeup 0 to 15% of total volume near the <br />^ 'The ne~ir surface permeability of the Valmont soil is slow and water capacity is <br />' moderate. The effective rooting depth is 60 inches or more and water erosion hazard is <br />slight. <br />' The establishment and maintenance of grasses is restricted by the clay loam surface <br />layer and the clayey subsoil. A mulch of plant residue reduces runoff and help moisture <br />retention. Applications of nitrogen and phosphorous containing fertilizers and manure <br />are needE:d to maintain fertility. Irrigation may be necessary during dry periods. <br />Ustic Torriorthents, c]aLy, 0 to 50 percent slgpe -- These soils consists mainly of <br />clayey fill'. material that has been placed on various other soils. The fill originated from <br />~ , shale and was created mainly as a berm around the north and west edges of the <br />existing quarry and as road fill under Highway 93 and nearby gravel roads. <br />t Composition, runoff, and water capacity of this unit is variable and permeability is slow. <br />Water erosion can be severe. <br />Plantings are difficult to establish on this soil unit. A mulch of plant residue helps <br />' reduce nmoff, maintain filth, and conserve moisture. Selecting adapted plants is <br />important and fertilization with manure, phosphorous and nitrogen helps improve <br />' fertility. Supplemental irrigation may be necessary. <br />Torrifluents. very eravelly. 0 to 3 percent slopes -- Torrifluents are deep, excessively <br />drained flood plain soils formed in stratified sandy and gravelly alluvium to a depth of <br />' about 60 inches. <br />Because this soil unit is located adjacent to the mine site, off the permit area, it will <br />' not be disturbed and reclamation is not anticipated. <br />1 <br />' -36- <br /> <br />