Significant Project Features:
- Permeable Reactive Barrier (PRB) Installation by the Bio-Polymer Slurry Trench Method
- Installation of Two PRB Trenches
- Sand/Zero Valent Iron Backfill Mixture
- Backfill Mixed Onsite
- Demo of existing Air-Sparge/SVE System
The site, located in Rochester, Michigan, was originally used for industrial processes related to the automotive industry. Following the closing and demolition of the facility, an Air Sparge/Soil Vapor Extraction (AS/SVE) system was installed to remediate the plume of chlorinated solvents left behind. The plume began slowly migrating off-site and the existing AS/SVE system was no longer effective in the remediation of the contaminants.
- Intercept the plumes of migrating Chlorinated Solvents
- Treat In-Situ using Permeable Reactive Barrier (PRB) Technology
- Perform required demolition, restoration, and site work to convert the site into a public recreation area (park).
Description of Work:
Geo-Solutions installed two PRB Trenches Totaling over 8,000 Square Feet. The trenches were installed by the Bio-Polymer (BP) Slurry Trench Method and were up to 34-feet deep. This method has been used extensively since Geo-Solutions installed the first BP PRB trench in 1999.
The trench backfill was a mixture of granular Zero-Valent Iron and Sand. Backfill was mixed onsite using a mobile concrete mixer and tremied in place.
All trench spoils were disposed off-site in an appropriate landfill facility. The trench was clay-capped and a series of monitoring wells were installed for long-term observation and measurement.
Geo-Solutions also demolished and disposed of the existing AS/SVE system as well as all remnant footers and slabs from the original facility. The site was graded; topsoil cover was placed and the site was seeded and planted.
Due to the site contaminants, the project was designated HAZ and subject to OSHA 1910.120. The work was performed in an urban setting, in a moderately busy section of town. Site control, real-time air monitoring, and safe construction practices were paramount to protect both Geo-Solutions’ workers as well as the public. The project was completed on time and with zero health and safety related incidents.