REMOVING WATER PIPE FROM TRUNION. WRENCH SLIPPED CAUSING EE TO FALL HITTING HIS BACK ON A GUARD RAIL. HE DID NOT WANT ANY TREATMENT. HE WENT TO A DOCTOR ON 7/30/01 TO CHECK HIS BACK, IT WAS SO RE. THE DOCTOR'S REPORT WAS / BACK OK. POSSIBLE FRACTURE OF LEFT 11TH RIB. DR REPORT IN 8/9/01.