SU0004094 - Laserfiche WebLink

Home Browse Search

4 Resufts — • Zacharias clay loam,zero to 2 percent slopes, is not listed as hydric by NRCS — (2004). This very deep,well-drained, nearly level soil is on alluvial fans and low stream terraces. It formed in alluvium derived from mixed rock sources. In a typical profile, the surface layer is dark grayish-brown clay loam about 19 inches thick. The — subsoil and the upper part of the underlying material are brown clay loam about 34 inches thick. The lower part of the underlying material to a depth of 60 inches is yellowish-brown, gravelly clay loam. In some areas,the surface layer is gravelly clay — loam. Included in this unit are small areas of Capay soils in the slightly lower landscape positions and small areas of Reiff soils in the slightly higher positions. Also included, in landscape positions similar to those of the Zacharias soil, are small areas of Stomar and Vernalis soils and small areas of soils that are similar to the — Zacharias soil but are calcareous and underlain by gravel.Included areas make up about 15 percent of the total acreage.These inclusions are not listed as hydric by NRCS (2004). Permeability is moderately slow in the Zacharias soil. Available water — capacity is high. Runoff is slow, and the hazard of water erosion is slight. • Zacharias gravelly clay loam,zero to 2 percent slopes, is not listed as hydric by — NRCS (2004).This very deep, well-drained,nearly level soil is on alluvial fans and low stream terraces. It formed in alluvium derived from mixed rock sources. In a typical profile,the surface layer is dark brown, gravelly clay loam about 14 inches _ thick. The subsoil also is dark brown, gravelly clay loam about 16 inches thick. The underlying material to a depth of 60 inches is yellowish-brown gravelly loam. In some areas,the surface layer is clay loam or very gravelly clay loam. Included in this unit are small areas of Capay and Cortina soils in the slightly lower landscape — positions and Xerofluvents and Xerothents in drainageways. Also included, in landscape positions similar to the Zacharias soil, are small areas of Stomar and Vemalis soils and small areas of soils with a very gravelly, medium-textured surface layer and soils having a gravelly,coarse-textured substratum. Included areas make up about 15 percent of the total acreage. Although.the Xerofluvents inclusion is listed as hydric by NRCS(2004),this inclusion was not documented during soil analysis in the — field.Permeability is moderately slow in the Zacharias soil. Available water capacity is moderate. Runoff is slow, and the hazard of water erosion is slight. 4.2 Field Investigation 4.2.1 Study Area Setting The project site is located in the southeastern portion of San Joaquin County and the northwester — portion of Stanislaus County, in the Central Valley of California.The Central Valley is a vast, low-lying plain almost entirely surrounded by mountains. The valley parallels the general north- south trend of the Sierra Nevada on the east and the California Coast Ranges on the west. The — northern half of the Central Valley is known as the Sacramento Valley,and the southern half is known as the San Joaquin Valley. The San Joaquin Valley consists largely of floodplains,alluvial fans, and fan terraces, formed from alluvial material washed down from the Sierra Nevada. The — San Joaquin Valley contains the San Joaquin River and its many tributaries, including the Merced, Stanislaus, and Tuolumne Rivers. The topography of the Central Valley is relatively flat, with elevations ranging from a few feet to a few hundred feet above mean sea level(msl). Vernalis Quay Mining and Redamaioa Pmjed 4-4 ESA/203015 Welland Delineation Report Febmary 2006