THE PLANT WAS IN THE MIDST OF A SNOWSTORM. THE YARD AREA HAD BEEN PLOWED AND SALTED PRIOR TO THE WORK DAY; HOWEVER, SNOW CONTINUED TO FALL THROUGHOUT THE DAY. THE INJURED EMPLOYEE WAS WALKING TO HIS CAR AT THE END OF THE WORK DAY WHEN HE TRIPPED ON A RIDGE OF ICE OR ENEVEN PAVEMENT AND FELL, TWISTING HIS ANKLE.