Brief

As part of a real-estate sales agreement, the site of an active gas station in a residential area required remediation to address residue contamination. The small, heavily trafficked site required a discrete approach, based within a compact, self-contained infrastructure.

A previous contractor had attempted to remediate the site using in-situ chemical oxidation, but the program addressed only the symptoms of the contamination, and not the cause. IRSL earned the project directly with the landowner based on their past history, and their ability to effectively analyse the subsurface and recommend a sound solution.

Process

To mitigate the dissolved phase plume, IRSL analysed the geology, hydrogeology, and geochemistry, of the area and then designed, implemented, maintained, and continuously optimized a pump & treat system for the capture and treatment of Gasoline and BTEX compounds in the groundwater plume using a small, mobile system.

To remove the Petroleum Hydrocarbons from the impacted groundwater, IRSL used the following methodology:

1. Oil/Water Separator: To remove any NAPL.

2. Particle Filters: To remove fine particles.

3. Activated Carbon: To remove the Gasoline, BTEX, and other organic contaminants.

Results

Hydrogeological and geochemical testing confirmed plume capture.

The chosen treatment system met the discharge criteria.

The project realised an over 96% reduction in hydrocarbon mass in less than 3 months, resulting in the shut down of the system.

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