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.
An in-situ chemical oxidation (ISCO) remediation was conducted at a residential property in North Vancouver to address petroleum hydrocarbons (LEPH), phenanthrene, and pyrene contamination in 200 m³ of impacted soil and groundwater following a heating oil UST leak that migrated under the building foundation, causing vapour intrusion and free product in property sumps. A 2.5-meter injection radius was used for targeted treatments within the basement and exterior property foundation, utilizing directional injections and drive-points to reach both saturated and unsaturated zones. TRIUM leveraged the property’s sump system to artificially raise the groundwater level, creating a fully saturated treatment zone. Over seven days, 24 basement injections and 3 exterior injections delivered 20,104 litres of sodium persulfate, blended using TRIUM’s TriOx process with specialized activation products. The treatment successfully met regulatory soil, groundwater, and vapour guidelines, required only six weeks for completion, and allowed the property owner to safely return home with minimal disturbance.
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