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Thk alb Mitxmation k rat site <br />speciRc. Onslte Investigation, <br />testing and analysis by competent <br />personnel is needed before construc• <br />lion or other engineering use of soils. <~ ~~ <br />• 72--Midway-Casca~o complex, 10 to 40 percent slopes. This map <br />unit is on moderately sloping to steep ridges, knobs, hills, and edges <br />of fan terraces deeply dissected by streams. The native vegetation ~s <br />mainly grasses, cactus, and scattered pinyon and juniper. Elevation <br />is 5,300 to 6,500 feet. The average annual precipitation is 12 to 15 <br />inches, the average annual air temperature is 50 to 53 degrees F, and <br />the average frost-free period is 150 to 165 days. <br />This unit is about 60 percent Midway soil and about 20 percent <br />Casca~o soil. The Midway soil occurs mainly on steeper side slopes. <br />Th• Caseajo soil occurs mainly on knobs and hills and along crests of <br />terrace edges. <br />Included in this unit is about 10 percent Kim loam on terraces, <br />tops of hills, and foot slopes. Also included are small areas of <br />shale outcrop on steeper side slopes and about 10 percent soils <br />shallow or moderately deep to shale bedrock and otherwise similar to <br />the Casca~o soil. <br />The Midway soil is shallow and well drained. It formed in <br />residuum derived dominantly from shale. Slope is 15 to 40 percent. <br />Typically, the surface layer is grayish brown very gravelly clay loam <br />about 3 inches thick. Th• upper 4 inches of the underlying material <br />is clay. The lower part to a depth of 15 inches is extremely shalt' <br />clay. Weathered shale is at a depth of 15 inches. The soil is mildly <br />alkaline to a depth of 7 inches and matlerately alkaline below that <br />depth. <br />Permeability of the Midway soil is slow. Available water capacity <br />is very low. Effective rooting depth is 10 to 20 inches. Runoff is <br />rapid, and the hazard of water erosion is high. <br />~~~ <br />