The site, a 2.7-hectare facility, has historically contained several USTs for diesel and waste oil storage. While conducting due diligence assessments at the Site, (Phase II ESAs), VTX identified significant petroleum hydrocarbon (PHC) impacts to both soil and groundwater. Remedial strategies have been outlined by VTX and based on both client requirements and regulatory requirements of the Ontario Ministry of the Environment Site Condition Standards (SCS), VTX is in the process of executing components of work which include PHC source removal; In situ chemical oxidation; and, Enhanced bioremediation. The immediate remedial strategy or goal for the site was to remove the continuing source of groundwater PHC impacts, including residual and free-phase product via excavation and off-Site disposal of the impacted soil in direct contact with the water table.
Previous experience indicates that removal of PHC source soil is very effective at immediately decreasing groundwater contaminant concentrations, and enhances the ability of additional remedial strategies (i.e. in situ options) to complete the remediation of remaining groundwater and/or soil quality impacts. An in situ chemical oxidation (ISCO) remedial strategy is being carried out for soil and groundwater impacts in the vicinity of and beneath the operating site facility followed by the application of in-situ bioremediation to mitigate potential off-site groundwater impacts.
Industrial Property – Toronto, ON (Confidential Client): VTX conducted soil remediation at a property in which the soils were contaminated with petroleum hydrocarbons resulting from truck spillages and from an underground storage tank (UST) located on an off-site property.
The work involved co-ordinating utility and earthworks contractors, supervision of the excavation along the site boundary, monitoring the off-site disposal of contaminated soils, collection of confirmatory samples for laboratory analysis from the excavation, supervision of backfilling, compaction and resurfacing. Ongoing groundwater monitoring was carried out as part of the remediation activities.