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Baseline Technical Report <br /> ARCADIS Report for Soils and Biological <br /> Resources MLE2 Project Area <br /> mapping these units, as some vegetation has developed on disturbed areas through <br /> succession from surrounding vegetated areas. Portions of this map unit may have <br /> native soil remaining, but the unit is dominated by disturbed soil to the point where <br /> salvage of secondary growth medium is unfeasible from this unit. This map unit <br /> replaces unit IDS used in the 2007 Baseline Report (ARCADIS 2007) in order to be <br /> consistent with NRCS mapping. Although this is the most extensive soil unit in the <br /> Cresson Project area, only 6 percent (26 acres) of the survey area is classified as <br /> disturbed soil. <br /> 2.1.5 Re. Rogert very gravelly sandy loam, cool, 10 to 40 percent slopes <br /> Within the Cresson Project area, these soils are found on mountainsides with the <br /> natural and disturbed grassland vegetation community types. Texturally, these soils <br /> are identical to those of soil unit Rg described below, but have cooler subsurface <br /> r temperatures. Mapped distribution of this soil unit is unchanged from the 2007 <br /> Baseline Report (ARCADIS 2007). This soil unit does not occur within the survey <br /> area. <br /> 2.1.6 Rg. Rogert very gravelly sandy loam, 15 to 40 percent slopes <br /> These soils are found on mountainsides with the conifer-dominated woodland <br /> vegetation and natural grassland community types, typically on west- or south-facing <br /> slopes. Rogert series soils have formed from residuum derived from gneiss, granite, <br /> monzonite, or granodiorite. These soils are generally shallow and well drained. <br /> Approximately 2 percent (8 acres) of the survey area is comprised of this soil unit. <br /> 2.1.7 RgR. Rogert-Rock outcrop complex, 20 to 60 percent slopes <br /> This soil unit consists of areas where cliffs and rock outcrops occur comingled with <br /> Rogert series soils on steep mountainsides. Cliffs and rock outcrops may compose <br /> 30 percent of the unit. Approximately 16 percent (69 acres) of the survey area is <br /> comprised of this soil unit. <br /> 2.1.8 Rl. Herbman gravelly sandy loam, 5 to 55 percent slopes <br /> These soils are found on mountainsides in association with the natural grassland <br /> vegetation community type in the survey area in Section 17. Herbman series soils <br /> formed from residuum weathered from granite bedrock (also known as grus). These <br /> soils are shallow and well-drained. Approximately 25 acres of these soils are present <br /> in the survey area (6 percent of the total survey area). <br /> CCV Baseline Soils Biology Resource Report(11-17-11).doc 8 <br />