EE WAS STANDING ON SOME ROCKS AT THE TUB OF THE 1370 DRAGLINE. HE WAS ASSISTING IN REMOVING GREASE FROM AROUND THE CIRCLE RAIL IN ORDER FOR WELDREPAIRS TO BEGIN. HE WAS STANDING ON ROCKS TO ST AY OUT OF SOME WATER THAT WAS POOLED AT BASE OF TUB DUE TO HEAVY RAIN. EE SLIPPED OFF ON OF THE ROCKS. EE HAD ON RUBBER BOOTS.