EE WAS OPERATING VARIOUS HEAVY EQUIPMENT ALL DAYDRIVING THE MACHINERY TO THE WASH BAY. EE WAS IN GOOD SPIRITS AT THE END OF SHIFT & DID NOT COMPLAIN ABOUT ANY PAIN OR DISCOMFORT. ON 9/23/03 APPROX 8PM EE CONTACTED OFFICE AND INFORMED THEM HE HAD A LUMP ON HIS BACK & DUE TOBACK PAIN WOULD BE UNABLE TO RETURN TO WORK THE NEXT DAY.