Wellsite Remediation in Fort St. John, BC | In-Situ Chemical Oxidation (ISCO) Case Study

Case Studies

Wellsite Remediation in Fort St. John, BC | In-Situ Chemical Oxidation Case Study

Project Details:

Location:

Wellsite – Fort St. John, British Columbia

Site:

Oil and Gas Spill Site

Date:

2019

Present

Contaminant of Concern:

BTEX, LEPH, HEPH, PAH’s

Impacted Media and Volume:

2,700 m3 impacted soil and groundwater

Project Tasks:

Remedial Planning, Detail design, Procurement, Injection Well Installation, Blending and Field applications

View Project Images & Details →

The Problem:

Former helicopter fuel storage area overlying saturated shallow sands. Fuel (BTEX) contamination within the soil and dissolved in groundwater. Due to shallow groundwater, depths of impacts, and coarse-grained lithology, a winter injection program was developed.

The Approach:

Conducted a pilot test at the Site prior to full scale to ensure adequate distribution and determine the most appropriate radius of influence (ROI). Full scale in-situ chemical oxidation (ISCO) program was then conducted based on a 5 meter injection radius of influence. Establish health and safety protocol and site logistics for handling oxidizer.

Installed 42 injection wells and injected 60,000 litres of blended 15% EHP (enhanced hydrogen peroxide) oxidant. Blending is site specific following TRIUM’s ChemOx® process.

The Results:

Significant reduction in non-aqueous phase liquids (NAPL) in the groundwater
Significant reduction of overall plume size
Very short timeframe of treatment
Highly cost effective compared to traditional remedial options
Excellent reductions noted with injection distributions exceeding planned performance

Revolutionizing Site Characterization with AISCT® | AI-Powered Soil & Water Analysis

AISCT® revolutionizes site characterization with rapid, 20-minute soil and water analysis. This portable technology reduces lab dependence, enhances decision-making with real-time results, and ensures accurate volume estimations. It streamlines remediation, minimizes landfilling, and boosts confidence in project outcomes.

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.

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