Wellsite Remediation in Central Alberta | Ex-Situ Chemical Oxidation

Previously excavated soil was stockpiled on-site. Contaminants in the soil included BTEX, F1, and F2. A total of 1,900 m3 of low to moderate PHC impacted mineral soil was stockpiled and 600 m3 of heavily contaminated organic/ topsoil was stockpiled separately.

Mineral soils and organic soils were segregated due to high variability amongst the two piles for PHC concentrations. A specialized mulcher was used for the project in order to ensure the greatest contact between the oxidant and the impacted soils.

Mineral soils had a total of three passes with 56,150 kg of 50% EHP (enhanced hydrogen peroxide) applied. Pilot test on the organic soils had a total of three passes and 3,600 kg of 50% EHP (enhanced hydrogen peroxide) applied.

• Treatment of soils was completed in less than 1 month
• All 1,900 m3 of mineral soil was remediated to below applicable guidelines
• Organic soils were unable to be remediated to below criteria but had an overall reduction of greater than 40% after three passes
• Mineral soils were backfilled and organic soils were left in place for further soil management

‍