Ontario School Boards' Insurance Exchange - Uxbridge

Ontario School Boards’ Insurance Exchange – Uxbridge

Client:	Ontario School Boards’ Insurance Exchange
Location:	Uxbridge, Ontario
Budget:	$3.2 Million
Biggest Hurdle:	Timely Divestiture of Properties

XCG Consulting Limited (XCG) conducted remedial activities at Fourth Avenue South, in Uxbridge, Ontario for the Ontario School Boards’ Insurance Exchange (OSBIE) and the Durham District School Board. XCG operated as the prime constructor on the project supervising the remediation contractor and the infrastructure contractor. The project involved conducting the following over a period of six months:

Weekly groundwater monitoring at selected monitoring well locations.
Weekly methane readings and methane monitoring at seven methane sensors located in the interior of the Secondary School.
Monthly groundwater sampling at select set of monitoring wells.
Removal of liquid non-aqueous phase liquid (LNAPL) from monitoring wells containing measurable levels via a peristaltic pump.
Demolition of a single-story residential building.
Excavation and removal of approximately 30,000 tonnes of hydrocarbon-impacted soil from four residential properties, school property and Fourth Avenue South.
Installation of a LNAPL and impacted groundwater recovery system on school property.
Design and construction of Fourth Avenue South and school parking lot to urban standards as required by the Town of Uxbridge.

The excavation portion of the project was completed and XCG presented the analytical results and field observations to all stakeholders at a public meeting.

Following the excavation activities, additional remediation of residual LNAPL and dissolved phase hydrocarbons is on-going. The additional remedial work involves the following tasks:

Monthly groundwater monitoring and quarterly groundwater sampling at selected monitoring well locations.
Monthly methane readings at selected monitoring well locations and continuous methane monitoring at seven methane sensors located in the interior of Uxbridge Secondary School.
Manual removal of residual LNAPL from monitoring wells as observed via a peristaltic pump and one monitoring well equipped with an automated LNAPL recovery pump.
Operation of the LNAPL and groundwater recovery system on the Uxbridge Secondary School property.
Injections of RegenOX®, a chemical oxidant, to reduce hydrocarbon concentrations in soil and groundwater at the down-gradient portion of the plume; and in the area of residual impacts from the excavation at the base of an immovable hydro pole. The injections were completed using XCG’s Mobile C of A.

In an effort to divest of remediated properties, XCG has completed Phase I Environmental Site Assessments (ESAs) on three of the OSBIE owned affected properties, filing a Records of Site Condition (RSCs) at all three properties.