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Baseline Technical Report <br />ARCADIS Report for Soils and Biological <br />Resources, MLE2 Project Area <br />type. However, this soil unit is not found within the survey area. Soils in this <br />association are formed from colluvium or slope alluvium formed from volcanic <br />breccias and are very to extremely gravelly loam and well drained. Seitz series soils <br />are deeper than Bushpark series soils and have a thin upper horizon composed of <br />decomposed organic material. The small area mapped as BW by NRCS was <br />previously mapped solely as Seitz series soils (ARCADIS 2007). <br />2.1.2 CQ. Adderton - Rosane taxadjunct complex, 0 to 6 percent slopes <br />These soils are hydric or partially - hydric soils that occur on grassy stream terraces, <br />toe slopes, and floodplains in the Cresson Project area. Approximately 10 acres of <br />these soils are present within the survey area in Section 17 (2 percent of the total <br />survey area). Adderton series soils are deep, loamy, and well drained, whereas the <br />Rosan series soils are shallower loams and are poorly drained. Within the survey <br />area, Rosan series soils were observed to contain buried organic horizons with <br />abundant wood fragments. Both soil unit components are derived from alluvium. <br />Rosan series soils replace the Cryaquolls included in the previous CQ soil map unit <br />(ARCADIS 2007). <br />2.1.3 EB. Quander - Bushpark very gravelly loams, 5 to 40 percent slopes <br />These soils are found on mountainsides and face terraces in association with the <br />natural and disturbed grassland vegetation community types. Both components are <br />derived from colluvium and residuum composed of breccias and tuff, are very to <br />extremely gravelly loams and clay loams, and are well drained. Both series are <br />characterized by thick subsoil composed of angular cobble -sized rock fragments, <br />often with little soil between fragments. Inter - fragment soil is more abundant where <br />soils formed from colluvium than as residual soils. Bushpark series soils are <br />shallower and found on steeper slopes. This extensive soil unit comprises <br />approximately 43 percent of the survey area (183 acres). Quander series soils <br />replace the Ess series soils included in the previous EB soil map unit (ARCADIS <br />2007). Quander series soils were previously included in the Quander - Varden <br />complex soil unit (PF), which has been discontinued for consistency with NRCS <br />mapping. In addition, significant areas in the northern portion of the project area <br />categorized as Rogert series soils in 2007 are now mapped as the EB soil unit. <br />2.1.4 OR. Disturbed land, mine areas, overburden storage areas, mine complex <br />Areas that were historically mined or otherwise altered by human activities are <br />classified as disturbed soils. Surface disturbance was identified from 2010 aerial <br />photography and field observations. Differences in vegetation were also used in <br />CCV Baseline Soils Biology Resource Report (11- 17- 11).doc 7 <br />