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1 CHAPTERTHREE Atfecte~~d Enuironme~ ' Pipeline Corridor The proposed pipeline corridor from the Piceance Site south to the Pazachute Site crosses 33 soil mapping units. A brief description of the major soil types that would be disturbed is given below; however, chazacteristics of a1133 units aze included in Table 3.2-1 and Appendix B. Afrer the pipeline corridor emerges from the Piceance Site, it enters Hatch Gulcli, which contains Bazcus channery loamy sand (described above) at the lower end and Glendive fine sandy loam at the upper end. Glendive soils are deep, well-drained soils located along drainag~:ways or on alluvial valley floors. Permeability is moderately rapid and available water capacity is moderate. Slopes are 2 to 4 percent. The hazard of water erosion is slight and the wind erosion hazard is high. The main limitations for this soil are wind erosion and raze periods of flooding (SCS 1982). These soils aze considered fragile. As the pipeline corridor exits Hatch Gulch and progresses east towazd the Greasewood Compressor Station, it intersects four different soil types: Rentsac channery loatn, Yamac loam, Piceance fine sandy loam, and the Irigul-Pazachute complex (SCS 1982). Rents<<c channery loam and Yamac loam aze described above. Piceance Fme sandy loam is found on uplands and broad ridgetops. This soil unit is moderately deep and well drained, with moder:ite permeability and available water capacity is moderately low. Slopes aze 5 to 15 percent. The hazard of water erosion is moderate to high and the wind erosion hazard is high. The potential for soil erosion is the main limitation for this soil. The Irigu]-Pazachute complex is on ridges and rountainsides. Soils of this complex are shallow to moderately deep and well drained with moderate permeability. Slopes are 5 to 30 percent. Water erosion hazard is slight to very lugh and wind erosion hazard is very slight to none. The main limitations aze slope, water erosion, and shallow rooting depth (SCS 1982). These soils aze considered fragile. The pipeline corridor enters Collins Gulch in Section 16 T2S R96W, where it re-enters Glendive fine sandy loam (SCS 1982). The pipeline remains in this soil type along Collin~• Gulch until it crosses Piceance Creek. As the pipeline corridor continues south from Piceance Creek, it crosses a hillside with Rentsac channery loam as the dominant soil type. It then enters Stewart Gulch and re-enters the Glendive fine sandy loam soil type where it remains for approximately two miles. The pipeline corridor then proceeds south along the ridgetop between the Middle Fork and East Fork oi~ Stewart Gulch (Homes Ridge) where the dominant soil is the Redcreek-Rentsac complex (SCS 1982). These soils aze shallow and well drained. Depth to hazd sandstone or shale ranges from 10 to 20 inches. This exposed rock may be a potential reclamation problem. The pipeline corridor then crosses one drainage to the east where it remains on top of a ridge all the way to Davis Point, in this section being situated in Parachute-Rhone looms. The Pazachute-Rhone loam soil type is on ridge crests and mountainsides. These soils are moderately deep to deep and well drained with moderate permeability and low to high available water capacity. Slopes aze 5 to ..0 percent. Water erosion hazard is slight to moderate and wind. erosion hazard is very slight to slight. The Parachute soils, at lower depths, contain a high percentage of coazse fragments (SCS 1985). As the pipeline corridor moves down along Davis Point, it crosses Irigul channer}~ loam and the rock outcrop-Torriorthenis complex. Irigul channery loam is on upland ridges an~i mountainsides. These soils are shallow and well drained, with moderate permeability and very 3-10 Soils