As one of the most important job creation projects in the city, mainly unskilled workers were deployed, in weekly groups of 100 to 250 workers who rotated every eight weeks, Van de Vooren writes on his site Sporthistorie.nl. He reckons that it must have been quite a job, especially when you consider that just about everything had to be done by hand. It is known from the Goffertpark that 450,000 cubic meters of sand had to be removed manually. That does give an idea of the amount of work, writes Van de Vooren. “Twelve normal wheelbarrows are needed to move one cubic meter of sand. For 450,000 cubic meters that is 5.4 million trips…”