EE STEPPED ONTO THE TOP OF SUMP TANK WHICH WAS 15"" ABOVE THE FLOOR. HE HAD JUST FINISHED WASHING OFF THE TANK AND IT WAS WET. HE SLIPPED AND FELL BUMPING HIS RIGHT KNEE. HE WAS DIAGNOSED WITH A BRUISE AND GIVEN NO MEDICAL TREATMENT. ON 7/1305 HE WAS PLACED ON RESTRICTED DUTY WITH FOLLOW UP MEDICAL TREATMENT