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This soils information is not site <br /> specific. Onsite investigation, <br /> testing and analysis by competent <br /> personnel is needed before construc• - <br /> tion or other engineering use of soils. y <br /> 98tRoygorge very gravelly sandy clay loam, 25 to So percen - <br /> slopes . This shallow and well drained soil is on mountainsides . It <br /> ' formed in residuum derived dominantly from gneiss and granite . In , <br /> northern part of the area it is also formed in sandstone and <br /> ' quartzite . The native vegetaltion is mainly pinyon and juniper. <br /> Elevation is 6, 200 to 6 ,900 feet . The average annual precipitation is <br /> ' 11 to 14 inches , the average annual air temperature is 47 to 52 <br /> degrees F , and the average frost-free period is 120 to 150 days . <br /> Typically , the surface is covered with a mat of partially <br /> ' decomposed pinyon and juniper litter about I inch thick . The surface <br /> layer is brown very gravelly sandy clay loam about 2 inches thick . <br /> The subsoil is very gravelly sandy clay loam about 10 inches thick . <br /> Fractured gneiss is at a depth of 12 inches . Included in this unit <br /> ' are small areas of similar soils with dark surface layers 5 to 8 <br /> ' inches thick . The soil is neutral . The texture of the surface laver <br /> in some areas is very gravelly sandy loam or very cobbly sandy loam . <br /> ' Included in this unit is about 5 percent deep Sedillo cobbly sandy <br /> loam on foot slopes and in drainageways on side slopes . Also included <br /> ' is about 5 percent Rock outcrop in steeper areas and about 5 percent <br /> ' deep Wages loam in ridge sadd'les , • swales , and on benches . <br /> Permeability of this Royg,orge soil is moderate . Avaiiaole water <br /> ' capacity is very low. Effective rooting depth is 8 to 20 inches . <br /> Runoff is rapid , and the hazard of water erosion is very high . <br /> This unit is used for noncommercial woodland , wildlife habitat , <br /> recreation , and livestock grazing. Slope limits access by i1vesto1.K <br /> ' and results in overgrazing of the less sloping areas . Forage is <br /> ' sparse except on grassy benches and drainageways. <br />