Remediation of non-aqueous phase liquid wastes in groundwater systems containing trapped gas

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Clean water is a national priority. Millions of Canadians depend on clean groundwater as a source of drinking water. In addition, many of the tens of thousands of abandoned properties in Canada remain unused due to the contamination of soil and groundwater by industrial chemicals. Often, the most difficult sites to clean-up are those contaminated by chemicals such as petroleum fuels, solvents, dry cleaning fluids, and coal tar, which are known to present a significant risk to human health. Cleaning up these sites is a challenge due to the complexity of the subsurface, and the physical and chemical behaviour of contaminants. As a result, millions of dollars can be spent to remediate a single site. A detailed understanding of how contaminants move from their source into the surrounding groundwater is critical to engineering successful, cost-effective solutions.