Xylene was spilled onto moist glass beads or various moist sands and w
ater was trickled onto the columns every eight hours for periods up to
10 days. The xylene residual in the columns with water infiltration d
ecreased compared to those of control columns, indicating a downward d
isplacement of xylene. The extent of displacement increased with incre
asing size of the porous media and with increasing amounts of wafer in
filtration.