Smithville -- PCB DNAPL contamination of fractured bedrock and groundwater -- setting the stage for remediation
- Proctor and Redfern Ltd., St. Catharines, Ontario (Canada)
Off-site surface migration of PCBs was discovered at the Smithville Site in 1985. The subsequent bankruptcy of the owner resulted in the Ontario Ministry of Environment (MOE) assuming control of the site containment and remediation. A 3-Phase cleanup program was established. Hydrogeological activities in 1987 identified significant PCB DNAPL contamination of the groundwater and fractured bedrock and resulted in the addition of a fourth phase. Surface and sub-surface remediation proceeded with a constant focus on how best to deal with the bedrock contamination. A pump and treat containment program was initiated and operated in parallel with the site remediation work. Successful completion of Phase 1, 2 and 3 by 1993 resulted in returning the surface of the site and sub-surface soil to its original uncontaminated condition and created the foundation on which to investigate, research and develop knowledge and technology necessary to remediate the groundwater and fractured bedrock. Access to the bedrock remains possible via a large shored (open area) 17m x 20m excavation in the area of a former surface water lagoon. This lagoon was a source of PCB migration through 6 meters of clay into the underlying bedrock. A Remediation Options Report was prepared and recommendations and cost estimates were identified. Containment of PCB, TCB and TCE plumes continues nearly 8 years later via the pump and treat program while significant effort has been made to set the stage for eventual remediation. This has included the creation of the Smithville Phase IV Bedrock Remediation Program, Strategic Advisory Committee and a mechanism for ongoing support and involvement of the Township Council, Public Liaison Committee, MOEE and other stakeholders.
- OSTI ID:
- 353674
- Report Number(s):
- CONF-970677--
- Country of Publication:
- United States
- Language:
- English
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