Background
The site was home to a thermal electric production facility for some 25 years. Numerous accidental leaks and spills of diesel, oil and fuel contaminated the land and underground water supply. As the site was located on an isolated island, Biogenie was faced with the challenge of redesigning its equipment in order for it to be transported on site.

Other considerations included the depth at which the contamination was present (up to 15 meters) and the abundance of water. The site was also equipped with a pumping well system for the recovery and confinement of free-phase hydrocarbons.

Solution
Excavation of all contaminated soil was the sole alternative in order to guarantee the remediation of the affected area. In fact, excavation greatly influenced the successful recovery of hydrocarbons from the wells by releasing the free-phase hydrocarbons, which had been trapped in the fractured bedrock. Biogenie proceeded with the dismantling of building foundations and pipelines, as well as the excavation of 240,000 tons of soil. The treatment process selected, bearing in mind the allocated time frame and budget, was an ex situ Biopile process. Moreover, the contaminated groundwater was treated on-site prior to its discharge into the public sewer system.

Services

• Characterization study to determine the extent and degree of contamination;
• Management and supervision of excavation;
• Design, assembly and transportation of equipment to be set up on the site;
• Ex situ Biopile treatment of approximately 83,000 tons of soil for the reduction of contaminants to residential criteria levels;
• Contaminated water treated on-site and disposed of as municipal sewage.
   

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