SPECIAL NOTICE LETTER SENT 05/01/91. TRIGGERING 90-DAY NEGOTIATION PERIOD FOR FEDERAL FACILITIES AGREEMENT (FFA OR IAG) PURSUANT TO CERCLA SECTION 120. ACCORDING TO POLICY 30 DAYS MORE ARE ALLOWED TO COMPLETE NEGOTIATIONS IF SUBSTANTIAL AGREEMENT IS REACHED IN THE 90 DAYS, AND FINAL AGREEMENT WAS REACHED IN 90 DAYS, AND FINAL AGREEMENT WAS REACHED WITHIN THE 120 DAYS. SIGNATURES OBTAINED 09/16/91 ( FFA EFFECTIVE).