A pilot-scale field test of soil washing with a micellar solution to recover petroleum hydrocarbons at residual saturation took place at a decommissioned gas station. The pilot was launched after a preliminary step of vacuum extraction to remove most of the free-phase product. The micellar solution was introduced into the aquifer through an injection well located in the middle of a 7-spot pattern (6 pumping wells set with a hexagonal pattern). The polymer/micellar solution solubilized the remaining gasoline adsorbed on soil particles or trapped in the porous media, sweeping 40 m3 of contaminated aquifer. The site-specific solution for the contaminant and geological materials was optimized in the lab through phase diagrams and small sand column tests, plus hydrogeological modeling to optimize the injection/pumping ratio. The field test goal was to evaluate the efficiency of soil washing in a heterogeneous medium following a vacuum extraction step at the pilot scale. This paper presents lab and field methodology and results. [NOTE: In the U.S., the in situ application of cleansing agents to soil is known as in situ flushing, while only ex situ applications are referred to as soil washing.] http://www.esaa-events.com/remtech/2010/pdf/10-Grenier.pdf