A FEDERAL ARBITRATOR ruled Exxon Corp. and Alyeska Pipeline Service Co. must turn over full transcripts of conversations recorded the night of the Mar. 24, 1989, oil spill by the Exxon Valdez tanker. Magistrate David Ruskin was appointed by a federal court to decide what evidence is allowable in hundreds of spill related lawsuits. State and federal governments settled damage claims with Exxon for more than $1 billion last year (OGJ, Mar. 25, 1991, Newsletter).