Why is sampling at the soil/GW interface significant?

Sampling at the soil/groundwater (GW) interface is significant because it helps in identifying contamination trends. This interface is a critical zone where contaminants present in the soil can migrate into groundwater, which is a vital resource. By analyzing samples taken from this area, one can detect changes in contaminant levels over time, which is essential for understanding the extent and movement of contamination.

Monitoring contamination trends can reveal how quickly pollutants are spreading, helping to assess the effectiveness of any remedial actions taken. Moreover, it assists in making informed decisions regarding site management and necessary interventions to protect groundwater resources. This is why focusing on contamination trends at the soil/GW interface offers valuable insights into environmental conditions and helps ensure the safety of water supply in the area.