EE WAS STARTING TO SERVICE HIS ASSIGNED MACHINE, A CATERPILLAR 6578 SCRAPER TRACTOR (MACHINE #123). WHILE GOING TO THE OIL SUPPLY (WALKING ON THE GROUND), EE LOST HIS FOOTING (SLIPPED) AND FEL L ONTO THE GROUND INJURING HIS LEFT THIGH, RIGHT SHIN, RIGHT SHOULDER AND RIGHT ARM. SITE CONDITIONS WERE WARM, WET GROUND CONDITIONS.