A Phase II Environmental Site Assessment (ESA) was conducted to assess soil and groundwater conditions in the areas where an underground storage tank (UST) for gasoline and an aboveground storage tank (AST) for diesel fuel were previously located. The analytical results indicated that although there was no residual impact at the diesel AST, concentrations of petroleum hydrocarbons (PHCs) in the soil at the location of the gasoline UST previously located on the west side of the building were greater than the applicable regulatory guidelines. The PHC impact from the gasoline UST extended in all directions from the source including beneath the western portion of the building. The PHC impact in the soil was encountered to depths ranging from 3 to 4 metres below grade (mbg) and covered a surface area of approximately 1,000 m². ENG-TECH supervised the remedial activities, which included site inspections to direct the excavation and collect confirmatory samples. The Remedial Action Plan included the excavation of unimpacted soil (above the impacted soil) that was stockpiled. Excavation of the soil beneath the building required underpinning the building foundation and removal of the concrete slab inside the building to allow for the excavation of soil in this area. Approximately 4,000 m³ of PHC-impacted soil were excavated and transferred to a nearby soil treatment facility. The excavation was backfilled with the clean soil stockpiled at the site and additional clean soil brought to site.