AT 2:15 AM EMPLOYEE WAS CHECKING A PUMP WHEN HE ENCOUNTERED POWDER SMOKE FROM A SLAB RD BLASTED TOP OF RAMP. 7 HOLES AT 7:30 AM HE SAID HIS CHEST AND LUNG HURT, PAINFUL BREATHING HE WAS ADMINI STERED FIRST AID AND TAKEN TO A DOCTOR WHO PLACED HIM ON MODIFIED DUTY FOR OBSERVATION.