Fig. 6 Example of a visual wettability test conducted on the coarse-grained sand medium.
a. OTS-treated sand, NAPL-wet. b. Clean sand, water-wet. c. Clean sand, exposed to the field LNAPL for 24 hours
and air-dried before the wettability test, exhibiting an initial NAPL-wet behaviour. d. Clean sand, exposed to the
field LNAPL for 24 hours and air-dried before the wettability test, exhibiting a water-wet behavior one minute after
the application of the water droplet.
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