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Installation of a Permeable Reactive Barrier to Prevent TCE Migration

Background
Located in the heart of urban Toronto, this site hosted one of the last manufacturing plants in an area once highly industrialized The facility manufactured paints, enamels, resins and other types of coatings from 1945 to 1995, prior to being decommissioned (above ground infrastructures) between 1995 and 2003. Over the years, accidental spills and mishandling of raw chemicals delivered to the site, and stored in both above ground and underground storage tanks, resulted in the contamination of 50,000 tons of soil above the applicable criteria for industrial/commercial use. Contamination also reached the aquifer in one portion of the property. As the site was planned for redevelopment by a commercial property developer, the current owner sought a cost-efficient remedial solution.
 

Solution
Following an in-depth review of the available investigation reports and conducting its own supplemental characterization study to gather specific data, Biogenie proposed a guaranteed fixed-price remedial solution based on the on-site biological treatment of the contaminated soil combined with the construction of an innovative underground permeable reactive barrier to prevent off-site migration of TCE impacted groundwater. As the solution provided an estimated $1.5 M cost savings and was successfully completed within the planned 8-month schedule, it facilitated the sale of the property.


Services

  • Overall project management, including environmental monitoring, liaison with authorities and reporting;
  • Securing of 5 certificates of approval and authorizations from the Ontario Ministry of the Environment (MOE) and the City of Toronto;
  • Demolition of concrete slabs and foundations;
  • Dismantlement of all remaining infrastructures, including 22 underground storage tanks and asphalt pavement;
  • Excavation, on-site ex situ Biopile treatment and backfill of 50,000 tons of soil;
  • Construction of a granular iron underground permeable reactive barrier to prevent off-site migration of TCE impacted groundwater;
  • Environmental monitoring;
  • Preparation of a Remedial Action Completion report.


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