EMPLOYEE WAS INJURED IN A MOTOR VEHICLE ACCIDENT WHEN A 988F LOADER BACKED OFF THE WASH PLANT FEEDER RAMP AND STRUCK THE WATER TRUCK IN WHICH HE WAS SEATED. THE SPEED OF THE LOADER AT THE TIME OF THE COLLISION WAS WELL BELOW 5 MPH AND THE WATER TRUCK WAS STOPPED. THE EMPLOYEE WAS WEARING A SAFETY RESTRAINT AND HARD HAT.