lyondell citgo latest understanding buyback place 12 31 99 new deal 15 000 day begins 1 1 00 currently buyback provision ken howard b camp 12 16 99 12 27 pm gary w lamphier hou ect ect cc kenneth seaman hou ect ect kristen j hanson hou ect ect tina valadez hou ect ect howard b camp hou ect ect subject lyondell citgo gary notified possibility buyback effective lyondell citgo could please inform via cc mail status buyback reviewed hc