THE EE WAS LOADING EMULSION FROM THE PUMP HOSE TO THE POWDER TRUCK. THE HOSE WAS HUNG UP ON SOMETHING & HE GAVE IT A YANK & STRAINED HIS BACK. HE REPORTED THE INJURY TO HIS SUPERVISOR & CONTIN UED WORKING. HIS BACK CONTINUED TO BOTHER HIM SO ON 6-5-02 HE REQUESTED MEDICAL TREATMENT. HE WAS EVALUATED & TREATED @ ER. IN FOLLOW-UP TREATMENT EE WAS PLACED ON RESTRICTED DUTY.