REPLACING BOLTS INSIDE #1 ROD MILL WHILE CRAWLING THROUGH TROMMEL SCREEN & WALKING ON UNEVEN SURFACE HE FELT STRAIN IN RIGHT KNEE & SOLES OF FEET - WAS PERFORMING ALL JOB DUTIES - HAVE NOW BEE N INFORMED EMPLOYEE WILL HAVE SURGERY 10/10/02. WILL BEGIN LOSING TIME ON THAT DATE.