EE WAS GOING TO DO SOME CLEANING W/THE WATER CANNON MOUNTED ON A SPRINKLE TRUCK. EE EXITED LEFT HAND DOOR TO GO TO RT SIDE OF TRUCK. WHEN EXITING THAT SIDE INSTEAD OF RT DOOR YOU HAVE TO STEP ON HOOD OF TRUCK & THEN DOWN TO THE PLATFORM. AS EE STEPPED DOWN, HE SLIPPED ON THE WET DECK, HIS KNEE WENT UNDER HIM & HE FELL AGAINST THE FIRE EXT. THE DECK HAS NON-SKID MATERIAL. ADDED MORE