Ex-Situ Chemical Oxidation
Ex-Situ Chemical Oxidation
Oil Well-Site (Drilling Sump)
Location: Abandoned Oil wellsite – Central Alberta
When: 2019
Contaminant of Concern: Toluene
Impacted Media and Volume: 100 m3 impacted subsurface soil
Tasks: Blending and Field applications
The Problem
Former admixed drilling sump at an abandoned wellsite. Soil impacts were from 1 meter below grade (mbg) to 3 mbg, consisting primarily of toluene.
Access road to the site was partially reclaimed, which limited the remedial options available (ie/ limiting truck transport of contaminants).
The Approach
Impacted soils were excavated and an Allu bucket was used to homogenize soils and break up large soil clumps. The blended hydrogen peroxide was applied directly to the soil while the excavator was flipping and kneading the soil. A total of 5,000 litres of blended 20% EHP (enhanced hydrogen peroxide) oxidant was applied on the soil for treatment.
The Results
Minimal disturbance on the access road
Minimal disturbance to the wellsite as treatment was localized to stockpiled soil adjacent to the excavation
Remediation of soil in the former sump to below lab detection and within guidelines
All soil excavated from former sump backfilled into the excavation