When, during a third category operation, a coordinator becomes aware, after the work has begun, of the existence of one or more works presenting particular risks included on the list established by the order provided for in article L. 4532-8, he shall take all necessary steps to draw up, before any further work is carried out, the simplified general health and safety coordination plan.
The requirements arising from compliance with this plan are defined, where applicable, by means of riders to the various contracts concluded with the companies responsible for carrying out the work.