The services relate to the operation, monitoring and maintenance (including mowing) of the pumping installations and the salt water evacuation network of the MDPAs, which represents:

- about 18 million m 3 of water pumped per year and evacuated to the Rhine;

- an annual summer maintenance of the salt water evacuation network for 15 working days;

- approximately 467,000 m 2 to be cleared at least twice a year.

The services covered by this contract relate to physical and chemical samples and analyzes carried out by the service provider on behalf of the BRGM, as part of the monitoring of the water table of the potassium basin of Alsace.