EE WAS ACTING AS HOT SAND PLANT OPERATOR. ON THIS PARTICULAR DAY, ALL AREA SCHOOLS WERE CLOSED DUE TO ICY CONDITIONS. THE AREA AROUND THE ELECTRICAL CONTROLS, FEEDER AND WHERE HIS VEHICLE WAS PARKED HAD BEEN SANDED. DURING THE SHUT DOWN PROCESS, EE WENT TO SHUT OFF THE PROPANE CONTROL AND FELL ON HIS LEFT SIDE SINCE THE AREA WAS NOT SUFFICIENTLY SANDED.