Basle Convention The Basle Convention, which was signed on 7 February 1994, entered into force in the European Community on 7 May 1994. The Convention covers the control of transboundary movements of hazardous wastes and their disposal. The Basle Convention, which was signed on 7 February 1994, entered into force in the European Community on 7 May 1994. The Convention covers the control of transboundary movements of hazardous wastes and their disposal.