The works of this contract concern the rehabilitation of the sanitation disorders of the A4 motorway (Centre of St Avold) A4 352+900 direction Strasbourg - Paris, at the level of the underpass.

The works concern the rehabilitation of the sanitation disorders, which will require:- The supply and installation of temporary vertical signalling on the secondary network;- The intervention on ITPC for tipping including security;- The rental, installation and removal of 2 light towers including fuel constraints;- The clearing and trimming of the existing stumps;- Resumption of the sealing of the cast iron pads of all types;- The demolition and evacuation of existing structures;- Removal of wire mesh fences;- Cleaning and repair or replacement of basins or ditches or concrete half-nozzles;- Cleaning and reprofiling of ditches and earthen basins;- Restoration of the embankments of the underpass;- Creation and rehabilitation of access roads and operating roads;- Supply and installation of reinforced concrete pipes series 165 A and concrete half-nozzles;- Supply and installation of heads on manifolds;- Manufacture of basins or concrete ditch;- Realization of energy breaker absorption manhole;- Supply and implementation of cascading water downspouts including concrete flashing;- Construction of connection works of all types and connection works between collector and earth ditch;- Cleaning-Hydro-cleaning of the sewerage network in the SANEF right-of-way;- Removal, supply and installation of fences;- Supply and implementation of ditch grids;- Execution of extruded concrete separators type GBA and ends lowered to 1.65m