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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 DS 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 />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 RI. 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 />