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OVERVIEW

Historical spills at an industrial facility in Central Ontario resulted in groundwater being impacted with chlorinated ethenes including tetrachloroethylene, trichloroethylene, cis 1,2 dichloroethylene and vinyl chloride.

The dissolved concentrations of the compounds of concern were:

• PCE (maximum concentration of 14.9 μg/L)
• TCE (maximum concentration of 89,000 μg/L)
• cis 1,2- DCE (maximum concentration of 82,300 μg/L)
• Vinyl chloride (maximum concentration of 1,680 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 capital expenditures and infrastructure.

THE VERTEX APPROACH

 Reductive dechlorination:

• Abiotic
• Chemical

Source zone "seeding".

Eight permeable reactive zones.

Injection/placement of reactive compounds:

• >7,500 kg of EHC®

Reactive material placed using direct placement and soil mixing.

OUTCOME

Successful installation of reactive zones via soil mixing.

Reductive dechlorination conditions created:

• Hydrogen present
• Decrease in redox of greater than 300mV within one week of placement
• pH remained neutral