RISK ASSESSMENT FOR ACTIVE AND DECOMMISSIONED LANDS

ARC Geobac undertakes risk assessments for contaminated lands. The risk assessment is undertaken using site data obtained from soil sampling and analysis, groundwater sampling, permeability testing, product plume delineation, hydrogeologic testing and a historical review of site use. Also included as part of the risk assessment may be toxicology sampling of the surface waters leaving the site, the receiving body of water, drainage outfalls and the marine waters and the soils and sediments immediate to the site.

The risk assessment develops an approach to site management and cleanup that is acceptable under government guidelines, yet is in line with the value and present and future use of the property, considering the risk of the site contaminants to the nearby landowners and the fresh and marine waters. If required, the remediation plan addresses the contaminants present and develops a containment control and treatment system for contaminants both above and below the ground surface. A treatment system for contaminated groundwater may encompass the entire site and adjacent areas, while the free product recovery system if necessary would address those parts of a site underlain by free product. Soil cleanup approaches are judged according to the degree of contamination, costs of treatment options and future land use. Alternatively, decommissioning of the property may be recommended through a Risk Based Corrective Action (RBCA) approach. When undertaking the site assessment, the RBCA may be considered the first phase of assessment followed by recommendations. Where the degree of contamination warrants, decommissioning may be applied for following the RBCA without further remedial work.