Figure 4
From: Imaging LNAPL distribution at a former chemical plant with time-domain induced polarization
Inversion results of LNAPL contaminant in profile L2; (a) conductivity, (b) phase, (c) normalized chargeability. The black solid lines represent the position of water table. The low conductivity anomaly (< 5 mS/m) marked in black dashed lines indicates the contaminated area consistent with the sampling data. The phase values corresponding to the high resistance anomaly are divided into the source zone marked in red dashed lines (< 20 mrad) and the plume zone marked in blue dashed lines (> 20 mrad). Moreover, the normalized chargeability below 80 mS/m marked in orange dashed lines represents the decrease of polarization within the source zone.
