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- - - - - - - - - - - - - - - - - - - TABLE I COMPARISON OF ALTERNATIVES BY ENVIRONMENTAL RESOURCE Geology and Soils No impact to geology. No direct impact to soils; however, soil erosion would occur during flood events. Land Use and Planning Existing land use would not be affected. Residential structures in Sterling and Atwood and agricultural land in Logan County would continue to be flooded. No prime farmland would be affected. Traffic and Circulation Existing traffic and circulation within the project area would not be affected. Highway 6 and several county roads would continue to be closed and damaged during major flood events. UPRR embankment would continue to be washed out during major flood events. en ~ . ~ a .. No impact to geology. Overall, approximately 45 acres of soils would be disturbed during construction of which 3 acres has been previously disturbed by development activities. All disturbed soils are widely distributed in Logan County. Soils in the project area have one or more characteristics which reduce their favorableness for the construction of earthen embankments. dikes, and levees. BMPs would be used to minimize soil erosion. The proposed actions are consistent with existing land uses in the project area. Flooding in Sterling and upstream of Highway 6 bridges for the design flood would be prevented. The extent of flooding within Atwood and agricultural lands would be significantly reduced. Approximately 33 acres of prime farmland would be affected, but only 5 acres would be permanently lost from production. Both vehicular and rail traffic wouid be reroutedlrescheduled during construction periods. Highway 6 and several county roads would continue to be closed during major flood periods; however, the length of closure would be reduced. UPRR embankment at Atwood and Riverside Cemetery would not likely be washed out during future flood events. No impact to geology. Overall, approximately 41 acres of soils would be disturbed during construction of which 2 acres has been previously disturbed by development activities. All disturbed soils are widely distributed in Logan County. Soils in the project area have one or more characteristics which reduce their favorableness for the construction of earthen embankments, dikes, and levees. BMPs would be used to minimize soil erosion. The proposed actions are consistent with existing land uses in the project area. Flooding in Sterling for the design flood would be prevented. Approximately 32 acres of prime farmland would be affected, but only 4 acres would be permanently lost from production. Both vehicular and rail traffic would be rerouted/rescheduled during construction periods. Highway 6 and several county roads would continue to be closed during major flood periods. UPRR embankment at the Riverside Cemetery would not likely be washed out during future flood events; however, the embankment at Atwood remains at risk.