Case Study:

Pipeline Release Remediation in Central Alberta: A Risk-Based ISCO Case Study

Oil and Gas, Central, Alberta Risk Based In-Situ Chemical Oxidation

A pipeline release site in Central Alberta faced residual petroleum hydrocarbon contamination (BTEX, F1, F2) that could not be fully treated with a multi-phase extraction system. Due to site lithology, a risk-based in-situ chemical oxidation (ISCO) approach was implemented with a 1.5 to 2.5 meter injection radius, installing 12 injection wells and injecting 6,500 liters of 12% EHP (enhanced hydrogen peroxide) followed by 3,700 liters of 15% sodium persulfate using TRIUM’s ChemOx® process. The treatment successfully removed all residual NAPL, fully remediated the plume area, and exceeded performance expectations within a short timeframe.

Project Details:

Location:

Oil and Gas, Central, Alberta

Site:

Pipeline Release

Date:

2018
to
to
2019
Present

Contaminant of Concern:

BTEX, F1, and F2

Impacted Media and Volume:

Impacted Media and Volume: 200 m3 impacted soil and groundwater

Project Tasks:

Remediation Program Design, Injection Well Installation, Blending, Multi-oxidant approach, and Field applications

The Problem:

Pipeline release was being treated using a multi-phase extraction system for non-aqueous phase liquids (NAPL). Residual contamination was unable to be treated using the current system. Lithology at the site comprised of clay with sand lenses as preferential pathways. Petroleum hydrocarbon impacts from 4 to 6 meters below ground surface.

The Approach:

Risk based in-situ chemical oxidation (ISCO) program based on 1.5 to 2.5 meter injection radius of influence.  Establish health and safety protocol and site logistics for handling oxidizer.  

Installed 12 injection wells and injected 6,500 liters of blended 12% EHP (enhanced hydrogen peroxide) oxidant followed with 3,700 litres of a sodium persulfate 15% blend. Blending is site specific following TRIUM’s ChemOx® process.

The Results:

  • Plume area meets all criteria
  • Removal of all remaining residual NAPL
  • Very short timeframe of treatment
  • Excellent reductions noted with injection distributions exceeding planned performance
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