sentences:  A major clean-up of the buildings began almost at once, but the challenge was formidable, especially with regard to the necessary asbestos removal and soil decontamination.Destruction of the factory buildings began only on 29 March 2004, and was completed on 8 March 2005.At the time of the factory, the island was accessible from two metal bridges (a suspension bridge designed by Daydé in 1928 linked the island to the right bank of the river Seine and another bridge designed by Seibert in 1931 with the left bank).