EE WAS WORKING 2ND SHIFT ON #1/2 KILNS WHEN HE ATTEMPTED TO REMOVE DEBRIS FROM THE STONE FEED HOPPER GRATES. AT APPROX 7:30 PM, HE SUDDENLY SLIPPED HIS RIGHT FOOT THROUGH/BETWEEN TWO BARS OF G RATING CAUSING A CONTUSION TO THE LOWER RIGHT LEG. HE CONTINUED WORKING WITH THE LEG AND ON MONDAY 7/29/2002 MEDICAL TREATMENT BECAME NECESSARY FOR A SECONDARY INFECTION & RESTRICTED DUTY.