Brief

In Cambridge, Ontario, a retail office had PHC-impacted groundwater flowing onto the site coming from a nearby active gas bar. In order to mitigate potential risks to down gradient receptors, a Permeable Reactive Barrier (PRB) was installed in the highly heterogenetic aquifer. IRSL then outlined a design verification program that was completed prior to the remedial program.

Process

The groundwater impacts were addressed using a combination of adsorption and enhanced aerobic bioremediation. IRSL used colloidal activated carbon (CAC), supplemented with oxygen-releasing compounds (ORC). The CAC and ORC solutions were injected into the impacted zones using direct push technology (DPT).

IRSL designed and implemented the install of Permeable Reactive Barrier in one week. During this one-week period 890kg of PlumeStop, 215kg of ORC-A and 230kg of ORC-P were injected using DPT.

Challenges

Working in a small parking lot which had a high volume of traffic coming in and out.

Sub-zero temperatures.

Variation in contaminant flux.

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