ENG-TECH provided environmental services at a First Nation in northwestern Ontario where previous investigations identified PHC impact beneath the building as a result of heating oil spills. The initial phase of the project was to conduct additional assessment of the soil and groundwater conditions at the site to determine the extent of the PHC impact. This phase included the installation of groundwater monitoring wells around the perimeter of the building.
After the initial phase, ENG-TECH prepared a Remedial Action Plan (RAP) that included in-situ treatment of the PHC impact. The in-situ treatment involved drilling vertical and angled holes beneath and adjacent to the building in order to inject oxygen-releasing chemicals into the PHC-impacted soil. ENG-TECH’s chemical injection program in the RAP included two events spaced approximately one month apart. Confirmatory sampling was conducted one month later to ensure the effectiveness of the in-situ treatment.