The the environmental site model (ESM®) is exclusive to RPI Group Companies. VEI used the ESM to support the remediation of chlorinated volatile organic compounds (cVOCs) and petroleum hydrocarbons (PHCs) in groundwater. Impacts originated from historic underground storage tanks combined with a migrating cVOC plume from an adjacent property.
The goals were to:
Enable future commercial redevelopment;
Address environmental issues required for financing; and
Manage liability associated with the upgradient contaminant source.
Approach:
Using ESM®, the VEI design team developed a multi-tiered injection plan that combined:
Trap and Treat® BOS 100® (activated carbon and elemental iron) to intercept chlorinated solvent migration,
Zero-valent iron (ZVI) zones to treat dissolved-phase cVOCs within the property, and
Trap & Treat® BOS 200+® (activated carbon with terminal electron acceptors (TEAs), nutrients and microbes) for localized PHC-impacted areas.
ESM® visualizations defined injection zones and allowed for real-time tracking of the in-situ injections during field implementation by the VEI team. The program comprised approximately 250 injection points and 130,000 L of reagent slurry across several treatment zones.
Results:
Four months post-injection, groundwater monitoring showed:
41–100% reductions in cVOCs, including complete removal of cis-1,2-dichloroethylene (DCE); and
92–94% reductions in PHCs within the localized source zone.
By combining remedial design characterization (RDC) and live field data, ESM® helped confirm reagent coverage and performance trends, shortening the adjustment cycle typical of large-scale in-situ programs.
