The key issue is whether the work statements for both the current and the winning contractor (for the smaller base) clearly spell out each contractor's responsibilities, including which contractor goes where to deliver (or pick up) which items. If the concern is that "...one contractor may be providing services for another contractor," then the work statements need to be modified to clearly indicate responsibilities so the Government is not paying twice for the same services. Any change in the current contractor's responsibilities and associated changes in the work statement may require a justification and approval for the revised contract scope.