EMPLOYEE WAS WORKING OFF A FIBERGLASS LADDER WITH ALUMINUM RUNGS. HE WAS LEANING TO THE SIDE TO TIGHTEN BOLTS, WHEN THE WRENCH HE WAS USING SLIPPED CAUSING HIM TO LOSE HIS BALANCE. THE EE FELL TO THE GROUND, LANDING ON HIS FEET AWKWARDLY AND FRACTURING HIS RIGHT FOOT AND LEG.