Water (8) Sampling (7) échantillonnage (6) Monitoring (6) Science (6) Sampling (6) Samplers (6) surveillance (5) surveillance (5) Average (5) temps (durée) (4) in situ (4) directive (4) Time (4) Laboratories (4) Exercise (4) Utilization (4) Exercise (4) comparaison (3) substance chimique (3) Comparison (3) Programs (3) Summer (3) Strategy (3) Progress (3) Metals (3) Measurement (3) Ability (3) Technique (3) Measurement (3)