THE EE WAS SITTING IN THE TABULAR CONTROL ROOM WHEN HE BECAME ILL AND LOST CONSCIOUSNESS. THE EE HAD BEEN DOING CLEAN-UP WORK IN 2 AREAS AT 3 DIFFERENT TIMES WITH BREAKS BETWEEN EACH CLEAN- UP. EE WAS TRANSPORTED BY AMBULANCE TO A LOCAL HOSPITAL FOR MEDICAL TREATMENT FOR HEAT EXHAUSTION AND RELEASED THAT SAME DAY. HE RETURNED TO WORK ON HIS NEXT SCHEDULED WORKDAY.