Wellsite Remediation in Crossfield, Alberta | In-Situ Chemical Oxidation (ISCO) Case Study

Case Studies

Wellsite Remediation in Crossfield, Alberta | In-Situ Chemical Oxidation

Project Details:

Location:

Wellsite - Crossfield, Alberta

Site:

Oil and Gas Site (Flare Pit)

Date:

2009

2017

Present

Contaminant of Concern:

BTEX, C6-C16

Impacted Media and Volume:

80,000 m3 impacted soil and groundwater

Project Tasks:

Detailed site assessment, Hydrogeological characterization, Remedial planning, Detail design, Procurement, Blending and Field applications

View Project Images & Details →

The Problem:

Former flare pit area overlying shallow fractured bedrock. Condensate (BTEX) contamination dissolved in groundwater covering 21,000 m2.

The Approach:

Conduct detailed geological/hydrogeological investigation to identify fracture pathways and contaminate transport.

In-situ chemical oxidation (ISCO) program based on 15 meter injection radius of influence. Establish health and safety protocol and site logistics for handling oxidizer.

Installed 90 injection wells, and injected over 100,000 litres of blended 17% EHP (enhanced hydrogen peroxide) oxidant. Blending is site specific following TRIUM’s ChemOx® process.

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The Results:

Plume area reduction by >90%
Highly cost effective compared to traditional remedial options, with minimal carbon footprint
Excellent reductions noted with injection distributions exceeding planned performance
Follow-up program for completion of impacts in source area

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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.

Urban Mall Parking Lot Groundwater Remediation: ISCO Treatment for Copper Contamination

A risk-based in-situ chemical oxidation (ISCO) remediation is ongoing at an urban mall parking lot in Southern Alberta to address a large copper plume in 1,000 m³ of impacted groundwater, with a freshwater receptor located down-gradient. Due to infrastructure constraints, a 5-meter radius injection program using hydrogen peroxide was implemented to catalyze a sequestration reaction and precipitate dissolved copper, forming a permeable reactive barrier to prevent further migration. Over two months, 1 million liters of blended hydrogen peroxide and reagents were injected using TRIUM’s ChemOx® process, ensuring long-term effectiveness with a reactive barrier lasting approximately five years. The remediation has been effective at both the source zone and down-gradient areas, with ongoing injections near the water receptor, achieving results without disrupting shopping center operations.

Case Study: