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5.11:SOILS <br /> Soil map units for the project area are identified in Figure 5.11-1. Soil map unit <br /> characteristics for the area potentially affected by project construction are summarized in <br /> Table 5.11-1. <br /> TABLE 5.11-1 <br /> Soil Mapping Unit Descriptions and Characteristics <br /> Map <br /> Unit Description <br /> 149 Devries sandy loam, drained, 0 to 2 percent slopes: <br /> The entire LEC project site, all four laydown areas, and the natural gas pipeline cross this soil unit. <br /> Formation: On basin rims of the San Joaquin delta in alluvium derived from mixed rock <br /> sources <br /> Typical profile: Sandy loam,fine sandy loam,or loam surface(13+inches thick)and upper <br /> subsoil(15±inches thick)over indurated hardpan(to a depth of 80±inches) <br /> Shrink-swell capacity: Low(surface and upper subsoil; not given for lower subsoil) <br /> Depth and drainage: Moderately deep above hardpan; Somewhat poorly drained; may be hydric, <br /> especially above hardpan <br /> Permeability: Moderately rapid <br /> Runoff: Slow <br /> Water Erosion: Slight <br /> Wind Erosion: Moderate <br /> Farmland Class: Not a Prime Farmland <br /> Storie Index: 18(Grade 5),very poorly suited to agriculture; limited by drainage and rare <br /> flooding <br /> Capability class: IVw-8(irrigated and non irrigated),severe limitations due to low available water <br /> capacity because root zone less than 40 inches over a hardpan <br /> Taxonomic class: Coarse-loamy, mixed, superactive, thermic Typic Duriaquolls <br /> 169 Guard clay loam, drained, 0 to 2 percent slopes: <br /> The LEC project site and two laydown areas(B and C)are immediately north of this soil unit.Although not <br /> directly affected by proposed LEC facilities,they are close enough that these soil characteristics may be <br /> present. <br /> Formation: On basin rims of the San Joaquin delta in alluvium derived from mixed rock <br /> sources <br /> Typical profile: Mottled clay loam surface(15+ inches thick)and subsoil(67+inches thick). <br /> Soil is calcareous throughout and weakly cemented below 15 inches. <br /> Shrink-swell capacity: Moderate(surface and substratum) <br /> Depth and drainage: Very deep; Poorly drained <br /> Permeability: Slow <br /> Runoff: Slow <br /> Water Erosion: Slight <br /> Wind Erosion: Very slight <br /> Farmland Class: Prime Farmland, if irrigated. Drainage system may be required. <br /> Storie Index: 45(Grade 3),fairly well suited to agriculture; limited by drainage and rare flooding <br /> Capability class: Illw-2(irrigated)and IVw-2(non irrigated),severe limitations due to wetness <br /> caused by poor drainage or flooding <br /> Taxonomic class: Fine-loamy, mixed,superactive,calcareous,thermic Duric Endoaquolls <br /> Soil characteristics are based on soil mapping descriptions provided in the online soil survey <br /> (http://websoilsurvey.nres.usda.gov)(NRCS, 2008); in the published soil survey(NRCS, 1992); and in the online <br /> Official Series Descriptions(OSDs)(http://www2.ftw.nres.usda.gov/osd/dat) (Soil Survey Staff, 2008). <br /> Soil descriptions provided above are limited to those soil units that could be directly affected by the LEC. Other soil <br /> mapping units are well outside of the project area but are shown on Figure 5.11-1 and include the following: <br /> 168-Guard clay loam, 0 to 2 percent slopes,230—Ryde clay loam, partially drained, 0 to 2 percent slopes, and <br /> 284—Water. <br /> 5.11-2 SAC/371322/082330009(LEC_5.11_SOILS.DOC) <br />