The site of this culture park was occupied by Amsterdam's largest gasworks from 1885 to 1967. This industrial heritage introduced aromatics, tar compounds, mineral oil, cyanide, and asbestos. Original plans to excavate and remove materials of concern would have cost in excess of 300 million euros. Instead, designer Kathryn Gustafson developed a plan requiring minimal removal by utilizing an asphalt cap contained with sheet piling. Final clean-up costs were reduced to below 15 million euros and secondary environmental issues associated with the transport of such a large volume of material were avoided almost completely.