Previously excavated soil was stockpiled on-site. Contaminants in the soil included BTEX, F1, and F2. A total of 1,900 m3 of low to moderate PHC impacted mineral soil was stockpiled and 600 m3 of heavily contaminated organic/ topsoil was stockpiled separately.
Mineral soils and organic soils were segregated due to high variability amongst the two piles for PHC concentrations. A specialized mulcher was used for the project in order to ensure the greatest contact between the oxidant and the impacted soils.
Mineral soils had a total of three passes with 56,150 kg of 50% EHP (enhanced hydrogen peroxide) applied. Pilot test on the organic soils had a total of three passes and 3,600 kg of 50% EHP (enhanced hydrogen peroxide) applied.
A closure-based in-situ chemical oxidation (ISCO) program was implemented at an operational power generation plant in Northwestern Alberta to remediate F2 and vinyl chloride contamination in 300 m³ of impacted soil. Site constraints, including existing infrastructure and a lack of groundwater, required a 0.75-meter injection radius for increased contact certainty. Over five days, 37 injection points were advanced, delivering 32,800 litres of 12% EHP (enhanced hydrogen peroxide) using TRIUM’s ChemOx® process. The treatment successfully met applicable soil quality guidelines within a short timeframe, with no disruptions to facility operations.
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