INJURED WENT TO THE TOP OF THE STORAGE DOME AND WENT OUTSIDE THE HEAD HOUSE TO JOG IN THE DUST COLLECTOR. LIGHTING WAS POOR AND HE TRIPPED ON A BOLT STICKING UP THROUGH THE GRATING AND TWISTED HIS KNEE. HE DID NOT REQUEST TO SEE A DR. UNTIL 4-5-00. AFTER DIAGNOSTIC TESTING IT WAS DETERMINE HE HAS A TORN MENISCUS WHICH WOULD REQUIRE ARTHROSCOPIC SURGERY TO REPAIR. SURGER PERFORM 6-2