Closure Based In-Situ Chemical Oxidation
Closure Based In-Situ Chemical Oxidation
Operational Power Generation Plant
Location: Confidential Municipality - Northwestern Alberta
When: 2018
Contaminant of Concern: F2 and vinyl chloride
Impacted Media and Volume: 300 m3 impacted soil
Tasks: In-line dilution system, injection and field monitoring
The Problem
Historical operations in the area had impacted the soil. Infrastructure currently in place limiting the remedial strategies available. Soil comprised of sandy loam with little to no moisture. Groundwater was present deeper than the zone of impacts.
The Approach
In-situ chemical oxidation (ISCO) program based on 0.75 meter injection radius of influence to increase contact certainty between the oxidant and the contaminants due to lack of groundwater. Injections were conducted using drive-points to target various depth intervals within each injection point. Due to current operations, the program demanded that injections could not conflict with day-to-day operations of the facility.
Over 5 days, advanced 37 injection points, and injected 32,800 litres of blended 12% EHP (enhanced hydrogen peroxide) oxidant. Blending is site specific following TRIUM’s ChemOx® process.
The Results
Confirmatory soil samples following injections met applicable guidelines
Very short timeframe of treatment
No facility operational shutdowns required