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Former admixed drilling sump at an abandoned wellsite. Soil impacts were from 1 meter below grade (mbg) to 3 mbg, consisting primarily of toluene.
Access road to the site was partially reclaimed, which limited the remedial options available (ie/ limiting truck transport of contaminants).
Impacted soils were excavated and an Allu bucket was used to homogenize soils and break up large soil clumps. The blended hydrogen peroxide was applied directly to the soil while the excavator was flipping and kneading the soil. A total of 5,000 litres of blended 20% EHP (enhanced hydrogen peroxide) oxidant was applied on the soil for treatment.
An in-situ chemical oxidation (ISCO) remediation was conducted at a former wellsite sump in Barrhead, Alberta to address BTEX, F1, and F2 contamination in 645 m³ of impacted soil and 3,000 m³ of impacted groundwater. Due to shallow groundwater and a saturated silty sand lithology, excavation was limited, requiring targeted in-situ treatment. A 0.75-meter injection radius was used for soil treatment via 40 injection points, delivering 28,000 liters of 10-15% MFR (modified Fenton’s reagent) over five days, while groundwater remediation involved 13 wells, injecting 60,000 liters over two events spanning 20 days. Using TRIUM’s TriOx process, the project achieved a >90% contaminant reduction, meeting regulatory guidelines within a short treatment timeframe.
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