Provide a holistic view of the many complex interactions that go into controlling contaminant behavior within the critical zone. Presenters from a variety of academic disciplines (microbiology, soil chemistry, plant physiology, etc.) give presentations regarding one contaminant class (e.g. inorganics, organics, hormones, antibiotics, steroids, etc.) from each of their perspectives (i.e. microbial processes that influence contaminant behavior, plant mechanisms that influence contaminant behavior and soil chemical or physical properties that influence contaminant behavior).