WHILE LOADING BARGE RRC 300 EMPLOYEE NEEDED TO THROW CEMENT FLOW VALVE TO DIFFERENT POSITION. VALVE STUCK WHILE THROWING IT AND EE WRENCHED BACK AND INJURED HIS RIGHT WRIST. BACK DID NOT IMPROVE, WAS SENT TO ORTHOPEDIC AND DUE TO LIMITATIONS SET BY DOCTOR STARTED LOSING TIME 8/28/02. ALSO EXHIBITED SYMPTOMS OF CARPAL TUNNEL AND WAS DETERINED HE HAS BILATERAL CARPAL TUNNEL.