A remediation project was undertaken during 2013 and 2014 at an airline parts manufacturing facility in Milton, Ontario. The environmental investigations conducted at the site identified groundwater heavily impacted with chlorinated volatile organic compounds (VOCs), such as trichloroethylene (TCE) and its break-down products at concentrations over 40,000 parts per billion (ppb) at below the site building. The impact was caused by historic spills of chemicals used for manufacturing operation at the site. The VOCs plume extended beyond the building footprints and migrated towards the creek immediately down-gradient to the site. A zero valent iron (ZVI) permeable reactive barrier was installed by others to prevent the VOCs migration in to the creek. In 2013, we evaluated various remedial options and selected in- situ remediation for the site. The in-situ remediation involved injection of a combination of ZVI and fermentable carbon substrate (EHC and EHC-L ) into the ground. The first phase of remediation was completed in 2014 with significant reduction and breakdown of VOCs within the site, particularly outside of the building footprint. The second phase of the remedial work will concentrate on reducing the VICs concentrations at the source area within the building.
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