EE STEPPED OFF OF BOTTOM STEP ONTO WET GROUND HIS FOOT SLIPPED ON THE WET GROUND & HE GRABBED THE HANDRAIL TO CATCH HIS BALANCE. ON 4/11/00 HEREPORTED HIS INJURY TO ANOTHER EE BUT CONTINUED WORKING WITH LOWER BACK PAIN. HIS FIRST DAY TO MISS WORK WAS 4/21/00