This environmental assessment presents an analysis of the environmental impacts associated with removal of personnel and equipment related to B-52 operations from Mather AFB. This assessment deals only with those issues that may experience direct impacts as a result of the proposed action. Because the action is a withdrawal rather than an expansion or construction project, the impacts are limited to the following areas; noise, air quality, solid and liquid wastes, air safety, and socioeconomics. Because no construction or demolition is planned, this action would not affect soils, hydrology, ecological resources, or land use. An archeological survey of the base conducted in 1985 found no evidence of any historic or prehistoric sites. As part of a separate Air Force action, Mather AFB is scheduled for closure by July 1993, as recommended by the Base Realignment and Closure Commission. The proposed withdrawal of the 320th BMW is not dependent on closure of Mather AFB.