A concrete company has been cited for ten serious safety violations by OSHA after a plant operator, 39, was fatally engulfed in a fly-ash storage silo on Aug. 6. The worker entered the cone-bottom silo in an attempt to break up clumps of fly ash that had clogged the bottom discharge. After attempts to dislodge clumps with a metal bar and air hose did not work, he climbed into the silo without a harness and lanyard and devoted several hours to breaking up the clumps before being engulfed.