XCG received notification of Ontario Ministry of Environment and Climate Change (MOECC) acknowledgment of another successful filing of a Record of Site Condition (RSC) in January, 2016. This MOECC acknowledgement was the final step of a project that began in early 2012. The project began with the review of soil and groundwater sampling reports for a multi-unit commercial property that identified the presence of low level chlorinated solvents from an off-site source. With the understanding the client wanted to obtain an RSC for the property, a Phase One Environmental Site Assessment (ESA), and additional Phase Two ESA investigations were completed to satisfy Ontario Regulation 153/04. Based on these reports a Risk Assessment (RA) was prepared and submitted to the MOECC for review. Comments were received from the MOECC that required additional vertical delineation of the groundwater impacts, and further assessment of the potential risk of vapour migration to indoor air. As well as addressing these additional site investigation requirements, the client advised that they would like the option to redevelop the site for residential use. A revised RA was prepared based on the additional site characterization data and the revised future property use scenario.
Project Gallery – Click an image to enlarge.
Several additional iterations of comments and revisions to the RA were completed. These iterations were predominately related to the MOECC detailed requirements with respect to sufficient investigation of areas of potential environmental concern (APECs) and lateral and vertical delineation of contaminants. Ultimately the RA was accepted by the MOECC in August 2015.
Due to the potential for vapour migration into the existing commercial building and possible future residential buildings. A risk management plan was prepared that allows for ongoing monitoring of the indoor air in the existing building, and installation of a vapour barrier with passive venting for any future commercial/residential building developed on-site. A Certificate of Property Use (CPU) specifying these risk management measures and others was issued by the MOECC District Office.
The RSC was then filed by XCG and acknowledged by the MOECC in January 2016.
This project highlighted the importance of understanding the MOECC expectations for investigation of APECs and lateral/vertical delineation of soil and groundwater impacts. As well, it is important to understand the time required to work through the process of having a CPU issued by the MOECC and ultimately getting the RSC acknowledged even once the RA has been acknowledged. In this case the time required to obtain the RSC was almost five full months following the date of acceptance of the RA, and this was with a full commitment of assistance from the local MOECC district office and RSC review staff.