Fig. 2. Dissolved concentrations of Cu (A), Pb (B), and Zn (C) in effluent solutions for column flow experiments on eleven soil samples from the Bogue (Bo) and Atlantic (At) sites. For reference, ground water standards adopted in North Carolina were 1.0 mg Cu L^–1, 0.015 mg Pb L^–1, and 2.1 mg Zn L^–1.