Story

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OVERVIEW

A chlorinated solvent plume (PCE) was migrating onto a commercial site in Toronto area and a lending institution required mitigating measures implemented. An in-situ approach was required due to the proximity of the property boundary, on-site building and depth to water table (~5 m). The dissolved concentrations of the compounds of concern were:

The dissolved concentrations of the compounds of concern were:

• PCE (maximum concentration of 450 μg/L)
• TCE (maximum concentration of 47 μg/L)
• cis 1,2- DCE (maximum concentration of 50 μg/L)
• Vinyl chloride (maximum concentration of 12 μg/L)

SCOPE OF WORK

Acquired all relevant permits to complete the remediation program.

Designed and optimized an in situ program to maximize treatment efficiencies.

Implemented a program that minimized impact to the Site given the presence of buildings and property boundary.

THE VERTEX APPROACH

Reductive dechlorination.

Reactive Zone including:

• Permanent Injection Wells
• Temporary Injection Points

Eight permeable reactive zones.

Injection/placement of reactive compounds:

• >225 kg of EHC®
• >80 kg of EHC®-A

OUTCOME

Successful installation of a reactive zone.

Reductive dechlorination conditions created:

• Redox reductions of up to -175mV
• PCE decreased from 450 g/Lt o 60 g/L
• No vinyl chloride generation