Terraphase was initially engaged to conduct a third-party desktop review of a legacy chlorinated solvent site in Kansas. The site, which had undergone multiple investigation phases over two decades, is currently occupied by an aircraft parts manufacturing facility adjacent to a private airport. The review marked the beginning of a 5-year effort to fully characterize the site and pursue regulatory closure through the Kansas Department of Health & Environment (KDHE) Voluntary Cleanup Program.
Scope of Services
Terraphase completed comprehensive horizontal and vertical delineation of volatile organic compounds (VOCs), revised the conceptual site model (CSM), and conducted a plume stability analysis. These efforts advanced the site’s regulatory status and positioned it for closure. To address contamination in the source area, Terraphase implemented a combined remedy approach using zero-valent iron (ZVI) for chemical reduction and in-situ bioremediation (ISB). The treatment process included hydraulic fracturing to enhance ZVI distribution and co-injection of bioremediation amendments to effectively shrink the VOC plume and meet KDHE’s “No Further Action” criteria.
Notable Accomplishments
- Completed full site characterization and reconceptualized the CSM
- Conducted plume stability analysis to support regulatory decision-making
- Advanced site toward closure under the KDHE Voluntary Cleanup Program
- Implemented innovative ZVI and ISB remedy with hydraulic fracturing
- Achieved significant VOC reduction in the source area
- Positioned site to receive a No Further Action designation from KDHE
