ON 5-20-03 EE WAS MOVING ROCKS FROM PIT HAUL ROAD, WHEN HE LIFTED AN APPROX 50# ROCK. HE STATED THAT LATER THAT DAY HE FELT A STRAIN IN LOWER BACK. THIS INCIDENT WAS NOT MENTIONED TILL 5-22-03 BUT DID NOT REQUEST TO SEE A DOCTOR. ON 5-27-03 HE REQUESTED TO SEE A DOCTOR AFTER FEELING PAIN IN LOWER BACK & GROIN AREA OVER THE WEEKEND.