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.
Former admixed drilling sump at an abandoned wellsite. Surficial soil impacts were excavated and removed from Site. Shallow groundwater limited excavation and required in-situ treatment method for remaining soil impacts and groundwater impacts. Lithology of the target treatment zone is saturated silty sand, creating a pathway for contaminant migration.
In-situ chemical oxidation (ISCO) program based on treatment of soils using drive points on a 0.75 meter injection radius of influence to increase contact certainty between the oxidant and contaminants due to unsaturated soils. Groundwater injections were completed using 13 injection wells targeting the saturated intervals. Injections were completed in the fall and winter so as to have a frost cap in winter.
The soil treatment program was conducted over 5 days with the advancement of 40 injection points and 28,000 litres of blended 10-15% MFR (modified fentons reagent) oxidant injected. The groundwater treatment program was conducted over 2 events for a total of 20 days and injection in 13 injection points and 60,000 litres of blended 10-15% MFR (modified fentons reagent) oxidant injected. Blending is site specific following TRIUM’s TriOx process.
A risk-based in-situ chemical oxidation (ISCO) remediation is ongoing at an urban mall parking lot in Southern Alberta to address a large copper plume in 1,000 m³ of impacted groundwater, with a freshwater receptor located down-gradient. Due to infrastructure constraints, a 5-meter radius injection program using hydrogen peroxide was implemented to catalyze a sequestration reaction and precipitate dissolved copper, forming a permeable reactive barrier to prevent further migration. Over two months, 1 million liters of blended hydrogen peroxide and reagents were injected using TRIUM’s ChemOx® process, ensuring long-term effectiveness with a reactive barrier lasting approximately five years. The remediation has been effective at both the source zone and down-gradient areas, with ongoing injections near the water receptor, achieving results without disrupting shopping center operations.
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