Rochester, MI: Former ITT Avon Site

Rochester, MI: Former ITT Avon Site

Project Description

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.

Project Objectives:

  • 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.

Project Challenges:

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.

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