A Technology Platform to Harness Speed and Certainty in Groundwater Remediation

This presentation will focus on utilizing a technology platform based on combined remedial approaches to maximize speed and certainty to achieve groundwater remediation objectives. The platform has a dual function; it sorbs contaminants quickly, removing them from the mobile phase and provides a high surface area matrix favourable for microbial colonization and growth. Contaminant availability within a risk pathway is therefore reduced, while at the same time contaminant destruction is accelerated. A discussion regarding the use of conventional technologies like groundwater extraction, soil excavation and in situbioremediation will show how combined technologies can significantly improve remediation efficiency. Data from full-scale field applications with long-term performance monitoring (>18 months) on mixed plumes with chlorinated solvents and petroleum hydrocarbons will be highlighted.

The presentation will include a case study featuring a Midwest manufacturing facility, which utilized the liquid activated carbon solution coupled with a slow release electron donor to control migration of a TCA and TCE plume offsite. Long-term performance data (18 months) showing up to a 99% reduction in contaminant concentrations was observed and will be discussed.

In addition, two projects located in the Northwest will be discussed - one an active service station where several technologies had previously been utilized for the treatment of MTBE, BTEX, and TPH, but had also fallen short of remedial goals. The second site consisted of mixed plumes from both a former gas station and dry cleaners. The site was a few city blocks away from a redevelopment project for the same client and there was concern regarding off-site migration due to the operation of a pump and treat system. With groundwater contamination as the primary concern at both sites and time/cost-sensitive deadlines rapidly approaching, a fast and permanent remediation strategy was required. Performance data and the results will be outlined.