U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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Taylor, A., M. Quimby, M. Miller, and D. Guilfoil.
Great Lakes Environmental Remediation & Redevelopment Conference, 16-18 October, Lansing, MI, 36 slides, 2019

The 1140 Broadway site in Ann Arbor, Michigan is contaminated with PCE to depths of 40 feet below ground and, despite previous attempts, had not been successfully remediated due to environmental challenges. Recent development interest provided a catalyst to remediate the site using permeable reactive barriers (PRBs) with the goal of reducing ~80% of off-site PCE mitigation. PRB design was challenged by the lack of adequate site characterization data, the non-continuous and variable sediments in the soil profile, the presence of separated upper and lower saturated units, and a tight construction and site development schedule. High-density remedial design characterization was used to develop a quantitative conceptual site model and a contaminant mass-driven design for more effective remediation. The model revealed 4,125 lb of PCE within the soil of a 60-ft wide band, with concentrations of 4,640,000 ppb in soil and 137,000 ppb in groundwater at the source. A PRB was installed consisting of CAT 100™ (PRB1) upgradient of the building and BOS 100® (PRB2) downgradient at the site boundary. In addition, the source area was treated with CAT 100 and BOS 100, a bacteria suite, starch, and yeast. Post-injection groundwater sampling in July 2019 one month after injections found an average PCE reduction of 68% in the source and PRB1 and 87% in PRB2.

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