Former MGP Superfund Site ISS Remediation

We were contracted by an electric services company in Taylorville, IL, to provide comprehensive environmental remediation services at a contaminated site. Our primary challenge involved implementing in-situ solidification/stabilization (ISS) within (3) three separate plume areas totaling to 27,108 square feet, reaching depths of up to 80 feet below ground surface. The site contained legacy manufactured gas plant waste, and we faced strict requirements for utility clearance, swell management, and control/monitoring of dust, odor, and VOC’s (volatile organic compounds). Deep mixing in limited-access areas added further complexity to the work.

To address these challenges, we developed and executed a comprehensive project plan tailored to the site’s conditions. At the core of our approach was the implementation of approximately 11,178-cubic yards of in-situ solidification/stabilization. We used a Bauer BG45 rotary drill rig to treat material ranging from 6-ft to 10-ft augers to depths of up to 85 ft deep.

We produced grout on-site using an MS-1200 batch plant, two 40-ton reagent silos, and two 150-ton guppies for a mix design composed of Portland Cement and Granulated Activated Carbon. In addition to the ISS work, we excavated and disposed of roughly 7,347-tons of contaminated soils and managed and disposed of around 3,000-tons of swell material by staging and stabilizing it under a pre-approved waste profile. Additionally, 102,854-gallons of contact water was captured and disposed off-site for control of environmental contamination.

We also maintained strict dust, odor, and vapor controls throughout the project. This included a water truck for dust suppression, reagent silo baghouses, polyethylene sheeting, and application of Rusmar AC-645 foam to contain emissions. Once the ISS and excavation work was complete, we restored the site with clean aggregate fill across approximately 53,000 square feet. Final restoration included grading and installation of additional fence line.

Our approach to in-situ solidification/stabilization and the efficient management of contaminated materials minimized environmental impacts and improved site safety and functionality. The successful integration of stormwater control systems, emission mitigation strategies, and full-site restoration left the area in a stable and visually improved condition. The client expressed satisfaction with our performance, reinforcing our reputation as a trusted partner for complex environmental remediation and heavy civil construction projects.