CIBA-GEIGY CORPORATION IS THE OWNER-OPERATOR OF THIS OPERATING FACILITY. OPERABLE UNIT 4 ADDRESSES SOURCE CON- TAMINATION AT ONE OF ELEVEN FORMER WASTE MANAGEMENT AREAS TO BE ADDRESSED UNDER CERCLA. THE REMEDY FOR THIS OPERABLE UNIT IS ESTIMATED TO COST 49 MILLION DOLLARS. CIBA-GEIGY HAS ALREADY SIGNED A CONSENT DECREE, WHICH HAS BEEN LODGED, AGREEING TO CONDUCT THE RD/RA FOR OPERABLE UNIT 2 ADDRESSING SOURCE CONTAMINATION AT 10 FORMER WASTW MANAGEMENT AREAS AT AN ESTIMATED COST OF 120 MILLION DOLLARS.