Case Study:

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

Wellsite – Fort St. John, British Columbia Risk Based In-Situ Chemical Oxidation

Project Details:

Location:

Wellsite – Fort St. John, British Columbia

Site:

Oil and Gas Spill Site

Date:

2019
to
to
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

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
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