A former chemical works site in England was to be redeveloped as residential properties. During the operational life of the works, the underlying groundwater had become impacted with a wide range of contaminants, including chlorinated ethenes and monochlorobenzene, which were found to be providing significant risk to the environment and human-health. The remediation approach chosen was a fixed period of Pump and Treat (P&T) in order to provide a significant reduction in the contaminant mass onsite. In order to maximise the amount of contamination removed, PetroCleanze® was injected to temporarily increase desorption of the adsorbed mass. This could then be pumped out by the system, making it more effective. The treatment would then be followed by enhanced reductive dechlorination (ERD) using a single application of 3DMicroemulsion®.