Brief

The decommissioning of a gas bar, situated in the parking lot of a shopping mall, required remediation to prepare the site for new development. The busy location necessitated a discrete approach, on a small site based between two operating stores, with no disruption to local businesses.

The petroleum company hired a local environmental consulting firm to characterize the site, complete preliminary sampling, and monitoring; the consultant recommended an integrated approach.

Process

IRSL used infiltration galleries to treat any residual Non-Aqueous Phase Liquids (NAPLs) in the source zone where the tanks had been situated and Direct Push Technology (DPT) to address the plume. Nine injections were completed, each one requiring 4–2 days (decreasing as the plume shrunk in size).

To mitigate the gasoline without disrupting surrounding businesses, IRSL combined chemical oxidation and aerobic bioremediation, which required little infrastructure and ensured a very small ecological footprint.

Results

Despite the unique challenges with this site, the project was completed on time and on budget.

The result met the Ministry of Environment’s Table 3 Standards for commercial sites.

Post-injection samplings have confirmed the site has remained within Ministry standards for over a year.

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