In 2011, XCG was retained by O’Brien & Gere Consultants to undertake the necessary studies to assess and remediate a former manufacturing facility in Whitby, Ontario. XCG undertook a peer review of previous environmental reports, developed a remedial action plan, and completed a Phase One and Phase Two ESA in accordance with O. Reg. 153/04.

Project Highlights

Peer Review and Gap Analysis

Prior to preparation of the detailed remedial action plan XCG completed a review of several previous environmental investigations. The reports reviewed included the findings of a Phase I ESA, Phase II ESA, Soils Remedial Action Report, Remedial Investigation and Feasibility Study Report, Site Specific Risk Assessment (SSRA) and the Ontario MOE review comments, and the final SSRA. The Phase I and II ESAs and SSRA were completed in accordance with the MOE document “Guidance on Site Specific Risk Assessment for Use at Contaminated Sites in Ontario,” dated May 1996. The previous investigations indicated that soil and groundwater had elevated concentrations of volatile organic compounds (VOCs), including trichloroethylene (TCE), dichloroethylene (DCE) and vinyl chloride. However, due to the age of the existing data and extensive changes to the MOE Brownfield regulations, it was necessary to collect additional and more recent analytical data for soil and groundwater as required under O. Reg. 153/04, as amended. This involved a data gap analysis of existing investigations and remedial activities and the preparation of a work plan to address the gaps identified, including contamination found in fractured bedrock. Upon implementation and completion of the work plan, all necessary information to complete risk assessment and file a RSC in compliance with O. Reg. 153/04 (as amended) will be available. The client has requested an RSC be filed in order to obtain ‘closure’ for the facility. There is no current plan to change the land use to a more sensitive use.

Phase One and Phase Two ESAs

The Phase One and Phase Two ESAs were completed in in accordance with the requirements of Ontario Regulation 153/04 (as amended). The findings of the Phase One ESA identified areas of potential environmental concern (APECs) and that additional Phase Two ESA activities were required before a RSC could be submitted with respect to all or part of the Phase One Property. The Phase Two ESA field activities were completed between 2011 and 2013 and included investigation of soil and groundwater quality for the potential presence of metal and petroleum hydrocarbon (PHC)-related impacts and the delineation of known VOC related impacts vertically and horizontally. Based on the findings of the Phase Two ESA, it was determined that PHCs-related soil impacts were present in the location of the historical chemical storage area and that VOC groundwater impacts were present extending from the historical chemical storage area to the down-gradient property boundary. The Phase Two ESA included off-site delineation of the extent of the VOC groundwater plume.

XCG has completed the supplementary investigation activities, prepared Phase One and Phase Two ESAs in accordance with O. Reg. 153/04 and is currently preparing the Risk Assessment for submission to the Ontario MOE.

O’Brien and Gere Consultants contracted XCG for our site assessment expertise and our extensive knowledge of the Ontario Regulatory environment. 

© 2020 by XCG Consulting Limited

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