The market is divided into 4 lots: (1 and 2) water sampling for physico-chemical and chemical analysis, diatoms and aquatic macro invertebrates. (3) Laboratory analysis. (4) Report from the RCO 2023-24 campaign

On 7 stations (and on 17 stations governed by the OEG) over 4 sessions, taking field information. Receipt of the bottle provided by the provider of lot 3. Realization of in situ measurements and physico-chemical and chemical sampling in the water and sediment matrix. Packaging and sending samples to the holder of lot 3. Transmission of field information

on 2 stations during a campaign, taking field information and in situ measurements. Sampling of diatom and aquatic invertebrate communities. Taxonomic determinations, counting and calculation of polluo-sensitivity indicators (idgf, smeg and Ibmg1). Compilation and transfer of data to the holder of lot 4

for the 26 stations on the market, supply of the bottles and packaging equipment necessary for carrying out physico-chemical and chemical samples to the holder of lot 1. Receipt, inspection and analysis of samples from lot 1 and sending of the results to the holder of lot 4. Writing analysis reports

Coordination of actions at Lots 1, 2 and 3. Centralization and banking of data according to the required format. Drafting of campaign reports and final report on physico-chemistry, chemistry, diatoms and macro invertebrates