Natural Attenuation - Dealing with Contaminated Sites: From Theory Towards Practical Application - page 984

Fig. 22.1 Temporal development of a contaminant plume in groundwater due to Natural
Attenuation processes. Plume expansion occurs during time steps 1 and 2, during time steps 3
and 4 the contaminant plume has reached steady-state conditions, while the plume shrinks in step
5 (adapted from Teutsch and Rügner ( 1999 ))
Fig. 22.2 Overview over contaminant input and output processes and their role with respect to
contaminant plume development. Active remediation measures contribute optionally to a con-
taminant output in groundwater, either by contaminant destruction (e.g., ENA) or by shifting
contaminants into other compartments (e.g., Pump and Treat) (adapted from Grandel and Dahmke
( 2008 ))