Remediation of a Trichlorofluoromethane Groundwater Plume Using PlumeStop®
Liquid Activated Carbon™
Proper site characterization is a critical component of Conceptual Site Model (CSM) development, and without it, the CSM will often be incomplete and can lead to improper remedial design and remedy selection. Understanding the geochemical and the microbial profile within a groundwater plume are valuable components of the CSM.
Approach. Remedial investigation activities identified volatile organic compounds (VOCs) typically associated with the foam manufacturing process, including Trichlorofluoromethane (Freon 11), Methylene Chloride, Tetrachloroethene, Trichloroethene, and 1,4-Dioxane. In addition to VOCs, groundwater samples were analyzed for geochemical parameters and by a QuantArray Chlor(r) method to develop the microbial profile.
Following development of the Remedial Action Plan, a limited remedial investigation and injection pilot study were completed with two main objectives. The first objective was to collect design verification data for use with full scale design and execution. This was accomplished through in‐situ injection of PlumeStop(r) Liquid Activated Carbon(tm) (PlumeStop(r)) and Hydrogen Release Compound (HRC(r)) through an array of direct push injection points. The second objective was to gain Regulatory approval for State-wide use of PlumeStop(r). This site was one of two pilot studies used in North Carolina to obtain Regulatory approval.
Results. By completing design verification and remedial investigation work, the CSM was completed, and State-wide use of PlumeStop(r) was approved. A complete CSM provided a clearer understanding of the groundwater transport mechanisms and location of contaminant mass reaching the treatment areas which allowed for the proper PlumeStop(r) dosing and placement, currently the largest application in the world at a site contaminated