THE EMPLOYEE HAS BEEN WORKING IN THE DRILLING AND BLASTING AREA FOR 12 YEARS ON UNEVEN GROUND. ON 5/25 HE WAS ON THE GROUND WORKING BY A DRILL. HE JUMPED UP SLIGHTLY TO RETRIEVE SOME MATERIAL OFF THE DRILL DECK. AS HE LANDED HE EXPERIENCED PAIN IN HIS RIGHT KNEE. HE HAD SIMILAR INJURIES ON TWO OCCASSIONS AWAY FROM WORK. HE HAS CONTINUED TO WORK BUT WILL EVENTUALLY NEED SURGERY.