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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 4, 05 <br /> ' .,� tion or other engineering use of soils. <br /> F 11_4—Tolex—Larkson complex , warm, 25 to 50 percent slopes . Th , s <br /> map unit is on foot slopes below sandstone escarpments . The native <br /> vegetation is mainly Gambel oak with scattered ponderosa pine . <br /> ' Elevation is 7,000 to 7,500 feet. The average annual precipitation is <br /> 15 to 18 inches , the average annual air temperature is 43 to 45 <br /> degrees F, and the average frost—free period is 100 to 14-0 days . <br /> ' This unit is about 45 percent Tolex soil and about 40 percent <br /> Larkson soil . The components of this unit are so intricately <br /> intermingled that it was not practical to map them separately at the <br /> scale used . <br /> Included in this unit is about 10 percent talus lying at the base <br /> ' of escarpments . Also included is about 5 percent Rock outcrop . Rock <br /> outcrop consists of long sandstone escarpments at the top of the <br /> ' slopes . <br /> The Tolex soil is shallow and well drained . It formed in resicuum <br /> ' derived dominantly from sandstone and siltstone . Slope is 30 to 50 <br /> ' percent. Typically , the surface is covered with a mat of undecomposed <br /> Gambel oak litter about 1 inch thick over highly decomposed litter . <br /> ' The subsurface layer is pale brown very channery sandy loam about 5 <br /> inches thick . The subsoil is extremely channery sandy clay loam about <br /> ' 14 inches thick . Fractured sandstone is at a depth of 19 inches . The <br /> soil is neutral . <br /> Permeability of the Tolex soil is moderate . Available water <br /> tcapacity is very low. Effective rooting depth is 10 to 20 inches . <br /> Runoff is very rapid , and the hazard of water erosion is very nigh . <br /> 1 <br />