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' The establishment and maintenance of grasses is restricted by the clay loam surface layer and the clayey <br /> subsoil. A mulch of plant residue reduces runoff and helps moisture retention. Applications of nitrogen <br /> ' and phosphorous-containing fertilizers and manure are needed to maintain fertility. Irrigation may be <br /> necessary during dry periods. <br /> Ustic Torriorthents, clayey. zero to 50 percent slope - These soils consist mainly of clayey fill material <br /> ' that has been placed on various other soils. The fill originated from shale and was created mainly as a <br /> berm around the north and west edges of the existing quarry and as road fill under Highway 93 and <br /> nearby gravel roads. <br /> ' Composition, runoff, and water capacity of this unit is variable and permeability is slow. Water erosion <br /> can be severe. <br /> Plantings are difficult to establish on this soil unit. A mulch of plant residue helps reduce runoff, <br /> maintain tilth,and conserve moisture. Selecting adapted plants is important and fertilization with manure, <br /> ' phosphorous and nitrogen helps improve fertility. Supplemental irrigation may be necessary. <br /> Torrifluents.very gravelly.zero to three percent slopes -Torrifluents are deep, excessively drained flood <br /> ' plain soils formed in stratified sandy and gravelly alluvium to a depth of about 60 inches. <br /> Because this soil unit is located adjacent to the mine site, off the permit area, it will not be disturbed and <br /> ' reclamation is not anticipated. <br /> I <br /> I <br /> 1 <br /> I <br /> I 3 <br /> S ' ' SERGENT, HAUSKINS & BECKWITH <br /> / p <br /> B I CONSULTIN GEOTECNNICALENGINEERS <br /> PHOENIXNI% TUCSON.ALS000EROUE <br /> 1 DENVERILAKEWOOD•SALT LAKE CITY•EL PASO•RENO/SPARKS <br />