THE EMPLOYEE WAS CLIMBING DOWN A LADDER ATTACHED TO THE L-330 ENDLOADER ON THE LEFT REAR OF THE MACHINE WHEN THE ACCIDENT OCCURRED. AS THE EMPLOYEE STEPPED DOWN TO THE GROUND, HIS LEFT FOOT LA NDED ON THE EDGE OF A CONCRETE PAD TWISTING HIS LEFT ANKLE TO THE OUTSIDE. THE CONCRETE PAD AND THE SURROUNDING GRAVEL WERE NOT LEVEL. THE CONCRETE PAD WAS ABOUT 3"" HIGHER THAN THE GRAVEL.