Remediation of a DNAPL source zone using in situ Electrical Resistive Heating and Multi-phase Extraction

Sean L. Salvatori, Thomas H. Grimminck

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Contaminated Sites and Remediation I

ABSTRACT: An in situ thermal technology to heat soil and groundwater coupled with aggressive multi-phase extraction was used to remediate a dense non-aqueous phase liquid source zone at the former Outboard Marine Corporation of Canada (fiOMC Canadafl) industrial facility in Peterborough, Ontario. The 1,250 m2 source zone located beneath the floor of a warehouse contained trichloroethylene DNAPL throughout the soil column with accumulations of over 30 cm of DNAPL at the aquifer-aquitard interface. The remediation was successful in removing over 2000 kg of DNAPL and reducing groundwater concentrations of trichloroethylene by 100% from their pre-remediation levels compared to the remedial targets. There has been no occurrence of DNAPL noted in the remediation zone since the end of active remediation and the current concentrations of trichloroethylene in groundwater are stable and below the remedial targets.

RÉSUMÉ: Une technologie thermique in situ a été utilisée pour réchauffer le sol et l™eau souterraine, couplé avec une extraction polyphasée agressive afin de remédier une zone de source affligé par un liquide de phase non-aqueuse dense (DNAPL) situé à l™installation industrielle ancienne de la Corporation Outboard Marine du Canada (fiOMC Canadafl) à Peterborough, Ontario. La zone de source (1,250 m2) était située sous le plancher d™un entrepôt et contenait le DNAPL trichloréthylène le long de la colonne du sol, avec une accumulation de plus de 30 cm de DNAPL à la frontière entre l'aquifère et l'aquitard. La remédiation a réussi à éliminer plus de 2000 kg de DNAPL et a réduit la concentration de trichloréthylène par 100% par rapport aux niveaux avant la remédiation, comparé aux objectifs de remédiation. Suite à la remédiation, il n'y a eu aucun cas de DNAPL noté dans la zone de remédiation suivant la fin du procès actif, la concentration actuelle de trichloroéthylène dans l™eau souterraine est stable et satisfait les objectifs ciblés par cet effort de remédiation.

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Cite this article:
Sean L. Salvatori; Thomas H. Grimminck (2013) Remediation of a DNAPL source zone using in situ Electrical Resistive Heating and Multi-phase Extraction in GEO2013. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GeoMon2013Paper256,author = Sean L. Salvatori; Thomas H. Grimminck,title = Remediation of a DNAPL source zone using in situ Electrical Resistive Heating and Multi-phase Extraction,year = 2013}