EE WORKING ON AN AUTOMATIC STRETACH WRAP MACHINE STEPPED OFF OF AN 18"" LANDING ONTO A RAMP GOING INTO THE WAREHOUSE. WHEN HIS FOOT HIT THE RAMP HE ROLLED HIS LEFT ANKLE AND FELL ONTO THE RAMP. HE SPRAINED HIS LEFT ANKLE, X RAYS WERE NEGATIVE-HE WAS PALCED ON RESTRICTED DUTY.