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Environmental Assessment August 2005 Bowie Resources, L.L.C. Spmce Stomp Federal Coal Explotmion License (150- 2005 -43) erosion occurs when channels are formed in soils due to an increase in depth, volume, and velocity of the water (Hewlett 1982). Table 3 -2 — Location, Soil Units, and Potential for Erosion within the SSCEL Proposed Field Soil Unit Name Erosion Potential Action Hole Symbol PRP -SS -2 158 Henn — Fughes - Kolob family complex, 25 to 40 low - moderate percent slopes PRP -SS -3 157 Herm — Fughes complex, 5 to 25 percent slopes low PRP -SS4 157 Henn — Fughes complex, 5 to 25 percent slopes low PRP -SS -5 186 Shawa — Sandia family - Kolob family complex, low - high 40 to 65 percent slopes PRP -SS -8 185 Shawa — Sandia family - Kolob family complex, low - moderate 25 to 40 percent slopes PRP -SS -9 185 Shawa — Sandia family - Kolob family complex, low - moderate 25 to 40 percent slopes PRP -SS -10 186 Shawa — Sandia family - Kolob family complex, low high 40 to 65 percent slopes PRP -SS -11 185 Shawa — Sandia family - Kolob family complex, low - moderate 25 to 40 percent slopes PRP -SS -12 166 Leroux — Seitz complex, 5 to 40 percent slopes low - moderate PRP -SS -13 158 Henn — Fughes - Kolob family complex, 25 to 40 low - moderate percent slopes PRP -SS -15 158 Herm — Fughes - Kolob family complex, 25 to 40 low - moderate percent slopes Source: Cryer and Hughes, 1997 Geologic Hazards A geologic hazard is defined in House Bill 1041 as "a geologic phenomenon which is so adverse to past, current, or foreseeable construction or land use as to constitute a significant hazard to public health and safety or to property." The majority of geologic hazards identified within the SSCEL are historic in nature (BLM and GMUG 2004). However, renewed movement of existing landslides and the development of new landslides on unstable slopes were observed 3-41