Urban Mall Parking Lot - Risk Based In-Situ Chemical Oxidation - Case Study
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.
Urban Mall Parking Lot
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Location: Confidential Municipality - Southern Alberta
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When: 2019 and ongoing
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Contaminant of Concern: Copper
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Impacted Media and Volume: 1,000 m3 of impacted groundwater
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Tasks: In-line dilution system, batch mixing, injection, field monitoring, subcontractor management
The Approach
In-situ chemical oxidation (ISCO) program based on 5 meter injection radius of influence to allow for the sequestration of copper in the groundwater into a precipitate. Establish health and safety protocol and site logistics for handling oxidizer and reagents.
Injected approximately 1 million litres of blended hydrogen peroxide oxidant with amendments. 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.
The Results
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Effective application at the source zone and down-gradient area. Injections are on-going in down-gradient and water body receptor area
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Very short timeframe of treatment but long lasting reactive barrier (approximately 5 years)
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No operational shutdowns required at the shopping centre
