Alternative B is the only alternative that designates the Chapman Bench area as an ACEC and would be the most effective for protecting the special status bird species, vegetation, and wildlife habitat values of concern in the Chapman Bench area. Alternative B also would result in the greatest restrictions on the ROW authorizations, mineral leasing, and other surface-disturbing activities. Alternative D designates a portion of this area as the Chapman Bench Management Area and applies management to protect the values of concern; this management is less restrictive to resource uses and would provide fewer protections to special status species and wildlife habitat than Alternative B. Alternatives A and C would allow mineral development and would be less restrictive to ROW authorization than Alternative B. Alternative D would restrict locatable mineral entry, mineral materials disposal, and ROWs similar to Alternative B in the Chapman Bench ACEC, but would manage these activities similar to Alternative C across the remainder. Alternatives B and C would be the most restrictive of travel in the area, and would therefore provide the greatest protection to values from fragmentation and disruption related to motorized vehicle use.