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XCG Consultants Ltd. T.519-741-5774 F.519-741-5627 
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| Contact Information | |
| Remediation of PCE-Impacted Soil and Groundwater underneath a Shopping Centre Using ISCO | |
| Start Date: | 11/1/2003 |
| End Date: | 5/1/2006 |
| Location: | Edmonton, Alberta |
| Project Scale: | Completed, Monitored. |
| Media Treated: | Soil. |
| Clean up of Site Involved: | Site Characterization & Assessment, Treatment, Monitoring. |
| Site Condition: | Soil and groundwater impacted by PCE and its dechlorination byproducts, TCE, DCE, and vinyl chloride at an active commercial mall in Edmonton, Alberta. The geology of the site consists of a clayey fill underlain by a clay till with discontinuous interbedded sand lenses. The water table occurs at a depth of approximately 1.50 to 2.55 metres below ground surface within the clay fill and varying seasonally. The hydraulic conductivity of the fill and till units is less than 10-6 cm/sec with the horizontal hydraulic gradient being less than 0.01. the groundwater velocity is estimated to be less than 1 cm per year. Due to the presence of the mall over the impacted media, infiltration of precipitation is limited. |
| Proposed Site Usage: | Continued use as an active Commercial Mall |
| Reasons for Success: | The application of the ISCO system allowed the owner of the mall to complete the transaction while providing a 60% cost savings over another recommended remedial approach. |
| Regulatory Approvals Required: | n/a |
| Exceedance of Set Standards: | n/a |
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Technologies Used: |
ISCO - The oxidant, potassium permanganate, was delivered passively to the impacted media via a series of horizontal weeping tiles and vertical injection wells that were installed below the existing floor. |
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Description: Halogenated ethenes such as tetrachloroethylene (PCE) and trichloroethylene (TCE) are among the most common groundwater contaminants (Squillace, 2002). A variety of remedial approaches have been developed to address impacts from halogenated ethenes ranging from monitored natural attenuation to excavation and disposal at off-site facilities. One approach to addressing groundwater and soil impacts from PCE and TCE is in-situ chemical oxidation (ISCO). This approach involves treating the soil and groundwater, usually in-situ, with a chemical oxidant. Various oxidants are available including ozone, hydrogen peroxide, hypochlorites, Fentons Reagent, and potassium and sodium permanganate. The results of the injection program, which was carried out over a six-month period, reduced the soil and groundwater concentrations of PCE by greater than 98%. |
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| Emissions/Byproducts: | n/a |
| Source of Information: | XCG Consultants |
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