On April 12, 1991, the Secretary of Defense announced the closure of Castle AFB, California, pursuant to the Base Closure and Realignment Act. The base is scheduled for closure in September 1995. This EIS has been prepared in accordance with the National Environmental Policy Act to analyze the potential environmental consequences of the disposal and reasonable alternatives for reuse of the base. The document includes analyses of community setting, land use and aesthetics, transportation, utilities, hazardous materials/wastes, soils and geology, water resources, air quality, noise, biological resources, and cultural resources.Potential environmental impacts are increased noise levels, traffic, and emissions of air pollutants over closure baseline conditions and impacts to biological resources. Noise mitigations could include measures identified by Federal Aviation Regulation Part 150 studies. Roadway improvements may be needed to prevent unacceptable traffic congestion. For all alternatives except the Castle Aviation Center Alternative, air emissions would not interfere with achievement of attainment goals through the application of emission reduction measures identified in the State Implementation Plan without the consideration of conformity offset allocations. Insufficient conformity offsets exist to simultaneously accommodate reuse and the Naval Air Station Lemoore realignment cumulative action. Impacts to biological resources could require consultation under Section 7 of the Endangered Species Act. Redevelopment activities could alter drainage patterns and increase erosion which could be mitigated through proper engineering designs. Cultural resources could be impacted by conveyance of the property to a non-federal entity. Preservation covenants within disposal documents could eliminate or reduc. these effects to a non-adverse level. Because the Air Force is disposing of the property, some of the mitigation measures are beyond the control of the Air Force. Remediation of hazardous waste sites under the Installation Restoration Program is and will coItinue to be the responsibility of the Air Force.