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LE/N 'ELDER <br /> anvnaoei•.nwnsome�. <br /> • includes dissected uplands, low alluvial plains and fans, river flood plains and channels, <br /> and overflow lands and lake bottoms. <br /> 2.4.3 Site Geology <br /> According to the United States Department of Agriculture Soil Conservation Service <br /> "Soil Survey of San Joaquin County, California" dated October 1990, the soil types in <br /> the area of the nursery can be summarized as follows: <br /> The northern edge of the nursery is covered by San Joaquin sandy loam. The <br /> soil is moderately deep to hardpan. The surface layer is a brown, sandy loam to <br /> a depth of approximately 13 inches. The upper part of the subsoil is a claypan, <br /> approximately 7 inches thick. From the claypan to a depth of 5 feet is a brown <br /> and light brown indurated hardpan. Permeability is very slow in the San Joaquin <br /> sandy loam unit. Shrink-swell potential is high. The effective rooting depth is <br /> limited by the hardpan at a depth of 20 to 40 inches. Water application should be <br /> light and frequent. The soil is poorly suited for hardwood trees. <br /> • Most of the nursery is covered by Rocklin fine sandy loam. This moderately well- <br /> drained soil is moderately deep to a hardpan. Typically, the surface layer and <br /> upper portion of the subsoil is a fine, sandy loam to a depth of approximately 25 <br /> inches. From 25 to 36 inches in depth is a sandy, clay loam. The lower part of <br /> the clay loam is an approximate 4-inch thick hardpan. From 36 inches to 5 feet in <br /> depth is a dense, weakly-cemented, sandy loam. Permeability is moderate in <br /> the Rocklin fine, sandy loam unit. The effective rooting depth is limited by a <br /> hardpan at a depth of 20 to 40 inches. This soil is unsuited for hardwood trees. <br /> The southeast corner of the nursery is covered by Redding loam. This <br /> moderately well-drained soil is moderately deep to a hardpan. The upper surface <br /> layer is a 6-inch thick loam. A red loam extends from 6 to 27 inches in depth. <br /> Beneath the loam is a 3-inch thick red clay. Beneath the red clay to a depth of <br /> 60 inches is a silica cemented hardpan. In some areas, the surface layer is <br /> gravelly or cobbly. Permeability is very slow and water capacity is low. This soil is <br /> unsuited for trees. <br /> • <br /> 117226.E02/ST012R0696 Page 5 of 43 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />