One of the big sandpiles: hydraulic fill piled on the site of LC-39, pad A, June 1963. Out at the pad site, the pumps piled a pyramid of sand and shell 24.4 meters high, one of the highest recorded pumping operations. All the while, draglines, bulldozers, and other earth-moving equipment molded the mound into the approximate shape of the launch pad. Subsequent measurements revealed that this outsized sandpile had settled 1.2 meters and properly compressed the soil beneath. Bulldozers then removed part of the pile to bring the fill to the proper elevation
SOURCE: NASA SP-4204 Moonport: A History of Apollo Launch Facilities and Operations (Washington, D.C.: , 1978). By Charles D. Benson and William Barnaby Faherty.