Drilling Sump Remediation in Central Alberta | Ex-Situ Chemical Oxidation Case Study

Case Studies

Drilling Sump Remediation in Central Alberta | Ex-Situ Chemical Oxidation

Project Details:

Location:

Wellsite/Drilling Sump – Central Alberta

Site:

Well-Site & Drilling Waste Disposal Area

Date:

2014

Present

Contaminant of Concern:

BTEX, F1, F2

Impacted Media and Volume:

>10,000 m3 impacted stockpiled soil

Project Tasks:

Remedial Planning, Detail design, Procurement, Blending and Field applications

View Project Images & Details →

The Problem:

Former drilling waste disposal area under active remediation and with limited site access. Contaminants in the soil included BTEX, F1, and F2. A total of >10,000 m3 of low to moderate PHC impacted mineral soil, up to 7,000 ppm TPH.

The Approach:

EXCO process conducted on aliquots of up to 750 m3. Daily production of 300 m3. A specialized mulcher was used for the project in order to ensure the greatest contact between the oxidant and the impacted soils.

Mineral soils had a total of 500,000 Lof 25% - 50% EHP (enhanced hydrogen peroxide) applied.

The Results:

Treatment of soils was completed in less than 3 months
>90% of mineral soil was remediated to below applicable guidelines
Mineral soils were backfilled and organic soils were left in place for further soil management

Closure-Based ISCO Remediation at a Power Generation Plant in Northwestern Alberta

A closure-based in-situ chemical oxidation (ISCO) program was implemented at an operational power generation plant in Northwestern Alberta to remediate F2 and vinyl chloride contamination in 300 m³ of impacted soil. Site constraints, including existing infrastructure and a lack of groundwater, required a 0.75-meter injection radius for increased contact certainty. Over five days, 37 injection points were advanced, delivering 32,800 liters of 12% EHP (enhanced hydrogen peroxide) using TRIUM’s ChemOx® process. The treatment successfully met applicable soil quality guidelines within a short timeframe, with no disruptions to facility operations.

Pipeline Release Remediation in Central Alberta | ISCO & Permeable Trench

A pipeline release at an active multi-well pad in Central Alberta required remediation due to BTEX, F1, F2, and PAH contamination in 2,000 m³ of impacted soil and groundwater, with remediation timeframes limited by site conditions. A staged risk-based in-situ chemical oxidation (ISCO) approach was implemented with a 3-meter injection radius, involving the installation of 52 injection wells and five permeable reaction trenches to facilitate groundwater extraction and oxidant circulation. A total of 17,500 liters of 12% EHP (enhanced hydrogen peroxide) was injected using TRIUM’s ChemOx® process, with injections timed during frost-cap months to maintain pressure. Results show a well-defined and shrinking plume, significant source area concentration reductions, and an approximate 90% decrease in PHC and PAH concentrations since project inception.

Case Study: