Risk Based In-Situ Chemical Oxidation
Risk Based In-Situ Chemical Oxidation
Urban Mall Parking Lot
Location: Confidential Municipality - Southern Alberta
When: 2019 and ongoing
Contaminant of Concern: Copper
Impacted Media and Volume: 1,000 m3 of impacted groundwater
Tasks: In-line dilution system, batch mixing, injection, field monitoring, subcontractor management
The Problem
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.
The Approach
Injection program based on 5 meter radius of influence using hydrogen peroxide to catalyze 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.
The Results
Effective application at the source zone and down-gradient area. Injections are on-going in down-gradient and water body receptor area
Very short timeframe of treatment but long lasting reactive barrier (approximately 5 years)
No operational shutdowns required at the shopping centre