EMPLOYEE WAS HAULING REFUSE WITH A CAT 773 TRUCK WHEN HE LOST CONTROL OF THE VEHICLE AND IT STARTED TO SPIN ON THE ROAD WHICH HAD JUST BEEN WATERED. DRIVER WAS UNABLE TO GAIN CONTROL AND TRUCK HIT SAFETY BERM. OPERATOR STRUCK RADIO MOUNTED ON ROOF OF CAB, CAUSING LACERATION TO HIS FOREHEAD. SUTURES WERE REQUIRED TO CLOSE LACERATION.