Rob Thompson

Senior Professional, Antea Group

As a Senior Professional, Professional Geologist, and Registered Site Manager with Antea Group, Rob is responsible for project management, technical support/design and oversight/coordination of numerous long-term remediation projects associated with the petroleum and chemical industries. Rob is proficient at soil and groundwater assessment and remediation, and Conceptual Site Model development. Rob also serves as a Subject Matter Expert for various Competencies within Antea Groups Environmental Liability Practice Area. Rob’s passion is conducting proper site characterization to develop a complete Conceptual Site Model (CSM) for proper remedial design. Rob also supports Antea Group’s Decision Analysis & Cost Modeling services to help clients forecast project costs, define regulatory end-points, and set business financial goals.

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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