This tender includes the services for the construction of a rainwater treatment plant. This facility is located on a disused rest area of the A 46 at Betr.-km. 108+850 built in the Wichlinghausen area in Wuppertal. The nearest towns are Barmen and Oberbarmen.

For the construction of the basin, the following main services will be put out to tender:

600 m3 topsoil removal

8000 m3 of soil or rock loosen

5700 m3 construction pit production

1700 m2 of bored pile wall production

Install 240 t of steel

2400 m2 of formwork production

1300 m3 bew. Making concrete