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<br />represent an additional limitation for seeding on these soils. Temporary disturbance of <br />Parachute and Parachute-Rhone loams for pipeline construction is estimated at about 40 <br />acres. <br />As the pipeline corridor moves down along Davis Point, it crosses Irigul channery loam <br />and the Rock outcrop-Torriorthents complex. Irigul channery loam is on upland ridges <br />and mountainsides. These soils are shallow and well drained, with moderate <br />permeability and very low available water capacity. Topsoils are only 6 inches deep, <br />and there is no subsoil. Slopes are 9 to 50 percent. Water erosion hazard is slight to <br />severe, and wind erosion hazard is slight. Limiting factors include steep slopes, shallow <br />rooting depth, and very little available water for use by plants. These soils are <br />considered fragile. The Rock outcrop-Torriorthents complex occurs on the rock <br />escarpment (Rock outcrop) and colluvial slopes (Torriorthents) along the edge of the <br />Roan Plateau. It consists of exposed bedrock, very stony areas, shallow to moderately <br />deep soils over bedrock, and small pockets of deep soils. The outcrops and soils are <br />very steep to extremely steep. Rock outcrop is mainly Green River shale (oil shale) and <br />consists of loose stone fragments of bedrock broken from the escarpments. <br />Torriorthents are shallow to moderately deep clays to loams with variable amounts of <br />gravel, cobbles, and stones. Water erosion hazard is moderate to severe and increases <br />with increasing slope steepness. Wind erosion hazard is moderate. Extremely steep <br />slopes, shallow rooting depth, and rockiness are limiting factors. These substrates are <br />generally unsuitable as revegetation media. These soils are considered fragile. <br />Temporary disturbance of Irigul soils and the Rock outcrop-Torriorthents complex for <br />pipeline construction is estimated at only about 8 acres. <br />Within the Parachute Creek Valley, the pipeline corridor generally stays in Nihill <br />channery sandy loam, which is located on both sides of Parachute Creek all the way to <br />the Parachute Site. Nihill channery sandy loam is on nearly level to moderately sloping <br />alluvial fans and sides of valleys. It is deep, well-drained soil with moderately rapid <br />permeability and low available water capacity. Slopes range from 1 to 25 percent. <br />Water erosion hazard is moderate to severe, and the hazard of wind erosion is slight. <br />The main limitation is erosion on steeper slopes (SCS 1985). Typical topsoils are 11 <br />inches deep, and subsoils subsoils are lacking. These soils could be fragile on the <br />steeper slope where water erosion hazard is severe. Temporary disturbance of Nihill <br />soils for pipeline construction is estimated at about 43 acres. <br />I.3 Pazachute Site <br />The Parachute Site would be located at the existing Unocal facility where most soils <br />have already been disturbed. Disturbance of soils at the Parachute Site would be <br />related to construction of new processing facilities and would total about 56 acres. <br />Because these facilities would be used throughout the life of the project, associated <br />disturbance to soils is considered to be a long-term impact. <br />I-6 <br />