EE WAS REMOVING 3 CHUNKS FROM PUMP WHILE STANDING ON A 5 GAL BUCKET. HE REMOVED TWO AND FELT BACK POP WHEN TRYING TO REMOVE 3RD. A COMEALONG WAS AVAILABLE BUT HE DID NOT THINK HECOULD WRAP IT AROUND THE CHUNK. STANDING ON BUCKET CAUSED AWKWARD BODY POOSITION. A STAND HAS BEEN BUILT TO REPLACE BUCKET.