Here is a possible way to deal with the polluted ground (contaminated over the years by the myriad of industries that surround it) at the Marsa Open Centre site: Some of the buildings (perhaps the more private ones?) could be elevated while the ground below could be cleaned through bioremediation techniques - a process that can take many years.

Centro de Tecnificación Deportiva (Sports Research Centre) in Guijo de Granadilla, Cáceres, Spain by José María Sánchez García

All photos:  Roland Halbe via TwistedSifter