Groundwater remediation pump and treat carberry, Manitoba case study

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Courtesy of Nordevco Associates Ltd.

Executive Summary
Two of four underground gasoline tanks were removed from an old service station located in Carberry, Manitoba a number of years after the facility ceased operating. Two tanks were left on site and were used until 1985, when Manitoba Environment was notified that a domestic well in the vicinity of the abandoned site was contaminated with gasoline. The remaining tanks were removed, and a subsurface investigation identified a gasoline plume on the shallow ground water surface. As the site had been abandoned, the last property owner’s insurance company was tasked with site remediation. Over the next 8 years, the insurance company financed site remediation activities ranging from free product recovery, water table depression, land farming to an air stripping tower to remediate the groundwater. In 1993 the majority of the hydrocarbon-contaminated soils were excavated and transported off-site when the abandoned on-site buildings were demolished.

The on-site air-stripping tower was proving ineffective in remediating the groundwater and as a result, Nordevco Associates Ltd. was approached by the Manitoba Department of Environment and the insurance company’s consulting engineering firm to assist in the groundwater remediation.

The Technology

Nordevco’s BactiDomus® Technology was developed by a diversified group of research scientists working together at Universities in Belgium and France. Their goal was to create a mechanism with the flexibility to delivery biological solutions to a range of environmental issues more effectively and efficiently

The foundation for the success of the BactiDomus® Technology was the development team’s clear understands that for any carrier material to be successful it had to meet specific underlying needs of the organisms:

  • Regardless of the organisms used, they would be cultured in a sterile laboratory and would require time to acclimate to the environment they were activated in.
  • Microorganisms, like humans, do not exist or thrive in isolation of each other but rather rely on others for stimulation and competition;
  • Organisms prefer to grow and live in colonies or flocs and prefer to attach to something to anchor these colonies;
  • Individual species of microorganisms do not work in isolation to break down organic compounds. To successfully break down any organic completely to CO2 and H20, a variety of different organisms are required;

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