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January 9,2002 <br /> NOA ENVIRONMENTAL PROJECT NUMBER LE01416 <br /> Soil and Hydrogeologic Information <br /> 219—Redding loam, 0 to 3 percent slopes. This moderately well drained, nearly <br /> level gently sloping soil is on high terraces. It is moderately deep to a hardpan. It <br /> formed in alluvium derived from mixed rock sources. The native vegetation is mainly <br /> annual grasses and forbs. Slopes are complex, and the landscape is characterized by <br /> hummocky microrelief. Meandering drainageways and closed depressions fill with <br /> water to form vernal pools during the winter in many areas. <br /> Typically, the upper part of the surface layer is light brown loam about 6 inches <br /> thick... In some areas the surface layer is gravelly or cobbly loam. <br /> Included in this unit are areas of Yellowlark soils in drainageways and shallow, <br /> medium textured soils that have a claypan at a depth of 10 to 15 inches and are in <br /> landscape positions similar to those of Redding soils that have slopes of 3 to 5 <br /> percent. Included areas make up about 15 percent of the total acreage. <br /> Permeability is very slow in the Redding soil. Available water capacity is low... <br /> Runoff generally is very slow or slow but is ponded in the small vernal pools. The <br /> hazard of water erosion is slight. The rate of water intake in irrigated areas is 1.0 inch <br /> per hour (USDA, p.101,102). <br /> For information on all Redding soils, see above. Differences in the Redding variations are discussed <br /> below. <br /> 220--Redding gravelly loam, 2 to 8 percent slopes. This moderately well drained, <br /> undulating and gently rolling soil is on high terraces... <br /> Typically, the upper part of the surface layer is strong brown gravelly loam about 7 <br /> inches thick... In some areas the surface layer is gravelly sandy loam, cobbly loam, <br /> or loam, <br /> ... Runoff is slow or medium, and the hazard of water erosion is slight or moderate. <br /> The rate of water intake in irrigated areas is 1.5 inches per hour (USDA, p.102) <br /> 221—Redding gravelly loam,8 to 30 percent slopes. This moderately well drained, <br /> rolling to moderately steep soil is on dissected high terraces <br /> 5 <br />