Case Study:

Pipeline Release Remediation in Central Alberta | ISCO & Permeable Trench

Wellsite - Central Alberta Risk Based In-Situ Chemical Oxidation

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.

Project Details:

Location:

Wellsite - Central Alberta

Site:

Oil and Gas Site

Date:

2017
to
to
Present

Contaminant of Concern:

BTEX, F1, F2, PAH

Impacted Media and Volume:

2,000 m3 impacted soil and groundwater

Project Tasks:

Remediation Program Design, Injection Well Installation, Permeable Reaction Trench Design and Construction, Blending, and Field applications

The Problem:

Release from a pipeline on an active multi-well pad. Site is a cut and fill with artesian wells on-site on the fill side resulting in limited remediation timeframes. Soil and groundwater impacts to a depth of 4 meters.

The Approach:

Staged/Risk based in-situ chemical oxidation (ISCO) program based on 3 meter injection radius of influence. Permeable reaction trenches installed at the source area to allow for groundwater extraction and circulation of oxidant within the trenches. Establish health and safety protocol and site logistics for handling oxidizer.

Installed 52 injection wells and designed/ constructed 5 permeable reaction trenches. Injected/ circulated a total of 17,500 litres of blended 12% EHP (enhanced hydrogen peroxide) oxidant. Blending is site specific following TRIUM’s ChemOx® process. Injections and trench circulations were limited to months with a frost cap to hold pressure/ volume during injections.

The Results:

  • Plume area is well defined based on previous investigations
  • Plume has been reducing in size
  • Source area concentrations reducing
  • Approximately 90% reduction in PHC and PAH concentrations since project commencement

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