REPLACING A FLEXIBLE CONDUIT ON #3 KILN VARIBLE SPEED DRIVE. EE WAS STANDING ON MOTOR AND EDGE OF TANK BASE. THE BASE HAD OIL AND WAS A BIT ICY. HE WENT TO MOVE AND SLIPPED, HE PUSHED HIMSELF AWAY FROMT HE TANK AND LANDED ONT HE GROUND 3.5 FEET BELOW. HE LANDED ON HIS ANKLE. HE STRETCHED A TENDON IN THE TOP OF HIS FOOT. X RAY WAS NEGATIVE.