EE WAS DESCENDING THE WATER TANK ON A DRILL WHEN HE SLIPPED AND FELL APPROXIMATELY 9 FEET TO THE GROUND. HE WAS EXAMINED THE DAY OF INJURY AT E.R. AND RELEASED TO HOME. HE WAS EXAMINED BY THE AUTHORIZED PROVIDER THE NEXT DAY AND RELEASED TOFULL DUTY. NO MEDICAL TREATMENT WAS ADMINISTERED DURING EITHER EXAM. A MILD CONCUSSION CAUSED HIM TO MISS TIME FROM WORK STARTING 11/23/02.