Fig. 2.
Raw data for extractable Cr by the H2O2 extraction (△) and the NaOH extraction (▲). The yellow solid line is the threshold for NaOH extraction and the green dashed line is the threshold for H2O2 extraction. The ground surface elevation at the drill-hole location is 5.0 m ASL. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)