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• nahcolite by weight. The TI Bed is a honeycomb disseminated nahcolitic bed similar in appearance to the Greeno Bed. 7.2.4 Soils The soils in the American Soda project area are typically poorly developed due to conditions that are not conducive to good soil development, including low available moisture, cool temperatures, and slow vegetative growth (BLM 1994). Significant erosion has also suppressed soil development in the Piceance Creek Basin. Piceance Site The U.S. Soil Conservation Service (SCS) described and mapped seven soil series on the Piceance Site. These soil types include Hagga loam (0-5 percent slopes), Havre loam (0-4 percent slopes), Rentsac channery loam (5-50 percent slopes), Redcreek- Rentsac complex (5-30 percent slopes), Yamac loam (2-15 percent slopes), Barcus channery loamy sand (2-8 percent slopes), and Torriorthents-Rockoutcrop complex (15-90 percent slopes). A map showing the location of these soil types is presented in Figure 7-11. Prevalent soil types at the Piceance Site are Rentsac channery loam, Torriorthents-Rockoutcrop complex, and Yamac loam, with Redcreek-Rentsac complex and Barcus channery loamy sand occurring as minor components. • Rentsac channery loams are the dominant soils at the Piceance Site (Figure 7-11). This soil series consists of shallow, well-drained soils, with a high percentage of rock fragments within the various soil horizons. These soils have rapid permeability, very low available water-holding capacity, and a moderate erosion hazard (SCS 1982). Rentsac channery loamy have poor potential for development due to rock, stoniness, and slopes. These soils also have severe limitations for reservoirs or impoundments due to high seepage potential (SCS 1982). Torriorthents-Rockoutcrop complex soils are generally associated with intermittent stream channels (Figure 7-11). This complex is composed of 40 percent rock outcrops and 60 percent soils. The rock outcrops are vertical sandstone and shale cliffs or uplifted and tilted dike-like outcrops. The associated soils are very shallow to moderately deep, with occasional deep soils on lower slopes, and are excessively drained, gravelly cobble (SCS 1982). The Torriorthents-Rockoutcrop complex has severe limitations for development due to shallow soils and high rock content. Two experimental test phase cooling/retention ponds are currently located in this series. Because the texture of the soils is not conducive to retention of water, the ponds have been lined with impermeable material to prevent seepage. The Torriorthents-Rockoutcrop complex is also known to have poor reclamation potential due to shallow soil depth, inherent low fertility, and slope (SCS 1982). • Yamac loam soils are located on the western and northwestern portions of the Piceance Site (Figure 7-11). These soils are deep and well drained, with moderate American Soda. L.L.P. 7-12 Commeraal Mine Plan August I8, 1998