THE EE WAS CLEANING UP MATERIAL ON A WORK PLATFORM. AFTER FINISHING THE EE WAS RETURNING TO THE GROUND LEVEL VIA STAIRS. THE EE SLIPPED ON ONE OF THE STEPS WHERE OIL HAD BEEN SPILLED. THE EE CAUGHT HIMSELF USING THE HANDRAILS BEFORE LOSINGHIS BALANCE. WHEN HE CAUGHT HE TWISTED AND STRAINED HIS LOWER BACK.