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 catalyse a sequestration reaction and precipitate dissolved copper, forming a permeable reactive barrier to prevent further migration. Over two months, 1 million litres 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 centre operations.
Historical operations in the area had impacted the soil and groundwater creating a large copper plume. Shopping centre infrastructure currently in place limited the remedial strategies available. Soil comprised of sandy gravel, and the target treatment zone was fully saturated. Down-gradient of the source plume is a fresh water receptor.
Injection program based on 5 meter radius of influence using hydrogen peroxide to catalyse a sequestration reaction and precipitation of dissolved copper. Establish health and safety protocol and site logistics for handling oxidizer and reagents.
Injected approximately 1 million litres of blended hydrogen peroxide and reagents over a 2-month period. Blending is site-specific following TRIUM’s ChemOx® process and requirements for precipitation of copper. Injections were conducted to create a permeable reactive barrier down-gradient of the source zone and adjacent to a water body receptor.
A pipeline release at an active multi-well pad in Central Alberta required remediation due to BTEX, F1, F2, and PAH contamination in 2,000 m³ of impacted soil and groundwater, with remediation timeframes limited by site conditions. A staged risk-based in-situ chemical oxidation (ISCO) approach was implemented with a 3-meter injection radius, involving the installation of 52 injection wells and five permeable reaction trenches to facilitate groundwater extraction and oxidant circulation. A total of 17,500 litres of 12% EHP (enhanced hydrogen peroxide) was injected using TRIUM’s ChemOx® process, with injections timed during frost-cap months to maintain pressure. Results show a well-defined and shrinking plume, significant source area concentration reductions, and an approximate 90% decrease in PHC and PAH concentrations since project inception.
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 litres 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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