Maintenance market for green areas of slag heaps, mine shafts and piezometers. The works concerned by the specifications are the following:

- 5 sealed heaps;

- 11 mine shafts;

- 90 piezometric locations including 8 locations of old pumping wells.

Maintenance market for green areas of slag heaps, mine shafts and piezometers. the works concerned by the Specifications are the following:

- 5 sealed heaps;

- 11 mine shafts;

- 90 piezometric locations including 8 locations of old pumping wells.