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.
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.
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.
A closure-based in-situ chemical oxidation (ISCO) remediation was conducted at a former gas station in Southern Alberta to address BTEX, F1, F2, and PAH contamination in 6,630 m³ of impacted soil, bedrock, and groundwater, including off-site impacts beneath residential properties. Due to infrastructure constraints and vapour risks, a Remediation Train® approach was implemented, starting with a soil vapour extraction (SVE) and air sparge system, followed by a ISCO program with a 3-meter injection radius. Nested injection wells targeted various depth intervals, with careful scheduling around residential activity. Over 45 days, 1.6 million liters of 10% EHP (enhanced hydrogen peroxide) was injected using TRIUM’s ChemOx® process, achieving daily blend volumes of >35,000 L. The treatment successfully met regulatory groundwater quality guidelines, managed vapour risks, and was recognized as an industry-leading process by consultants, with no negative impact on the community.
Receive exclusive emails about our services, company updates and events
career opportunities, and more.
