|Client:||City of Oshawa|
In 2017, XCG was retained by the City of Oshawa (the City), to provide tendering support and engineering services including contract administration and construction oversight, during the implementation of risk management measures (capping and shoreline erosion control system) for the Oshawa Marina Lands and West Wharf Lands (the “Site”).
The Site was historically operated as a functional harbour with boat launch, fuel storage and repairs, and refineries. XCG was retained by the City to identify and delineate contaminated soils, sediment, and groundwater present at the site as a result of the historic activities and complete a Risk Assessment (RA) to assess the potential risk to receptors based on the identified contaminants. Based on the results of the RA, XCG developed a Risk Management Plan (RMP) to provide measures to reduce, if not eliminate, exposure of humans and ecological receptors to contaminants where unacceptable risk levels were identified. These risk management measures have been incorporated into in a Certificate of Property Use (CPU) issued by the Ontario Ministry of Environment and Climate Change (MOECC) dated January 18, 2017. The Risk Management Measures (RMM) include installation of capping (barriers), and erosion control, as well as other administrative controls.
XCG completed the detailed design of the Capping and Shoreline Erosion Control System and the City tendered the project for construction during the 2017 construction season. XCG provided tendering support, contract administration and construction oversight during the implementation of the capping system, including evaluating source sites for clean soil cover to be brought to the Site for capping purposes and completing soil verification testing as soil was brought on-site.
Source Site Testing
XCG liaised with the contractor hired by the City to confirm the suitability of each potential source site soil to meet the requirements for soil quality as defined by the CPU. XCG reviewed each source site for evidence of potentially contaminating activities and identify potential contaminants of concern. This included review of any available environmental reports for the source site and a site visit. Representative soil characterization samples from the source site were collected with special focus on areas where potentially contaminating activities may have occurred and the potential contaminants of concern may be present. Soil samples were submitted for laboratory analysis for contaminants of concern and confirmed to meet the required capping criteria as identified in the CPU. XCG reviewed and tested several potential source sites in collaboration with the contractor prior to identifying two source sites; one for clean soil cover, and one for vegetative soil cover.
Soil Verification Testing
Following confirmation that the source site materials met the criteria defined by the CPU, the contractor arranged for transport of the soil to the receiving site (i.e. the Site). Upon delivery of the soil to the site, XCG completed verification testing, in accordance with the requirements for soil brought from another property to an RSC property as defined by Reg. 153/04 Records of Site Condition – Part XV.1 of the Act under the Environmental Protection Act. XCG collected samples transported to the Site at a rate of one sample per 160 cubic metres for the first 5,000 cubic metres and at least one sample for each additional 300 cubic metres of soil. Soil samples were submitted for laboratory analysis of the identified contaminants of concern. XCG tracked (via GPS) the location of each truck load stockpiled or place on-site, to ensure that any loads that had a verification sample that did not meet the required standards, could be readily removed from the site.
XCG conducted construction oversight to confirm installation of the cap and shoreline erosion controls in accordance with project drawings and specifications and to ensure contractor compliance with the Soil, Groundwater and Sediment Management Plan in accordance with the CPU. XCG observed construction activities and maintained daily site activity logs.
Substantial Performance for the project was issued on January 19, 2018 with minor items, including hydroseeding of the site, delayed due to winter weather until spring of 2018.
XCG’s testing and confirmation of the quality of the soil at the source site in combination with the additional soil verification sampling upon delivery to the Site ensured that the site capping was completed in accordance with the CPU.
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