A series of dense non-aqueous phase liquid (DNAPL) spills was conducted in a twodimensional sand box filled with a variety of media. At the conclusion of the spill, the soil underwent remediation via a waterflood followed by a surfactant flush. Pressure data recorded during the experiments confirmed that DNAPL will be drawn into NAPL-wet lenses and result in negative capillary pressures. The waterflood had little impact on the NAPL distribution. The surfactant flush did reduce the DNAPL-water interfacial tension allowing some of the DNAPL to drain from the NAPL-wet lenses; however a NAPL-saturated layer remained at the bottom of the lenses. It was hypothesized that thickness of the NAPL-saturated layer that remained reflects the capillary pressure difference between the reduced NAPL-entry pressure of the hydrophilic soil below the lens and the reduced water-entry pressure that would allow the DNAPL to drain and water to enter the hydrophobic sand.iii ACKNOWLEDGEMENTS I would like to express my sincere gratitude to my friends, colleagues and family who were by my side for this journey. I would particularly like to thank my supervisor Dr. Paul van Geel without whom this work never would have been completed. His guidance and patience have been greatly appreciated. I would also like to thank my colleagues and the staff at Carleton University; particularly Marie Tudoret Chow, Stanley Conley, Pierre Trudel, and Jason Arnot.In addition, I would like to acknowledge the help of former colleagues Luz A Puentes Jácome and Farah Hasson.