Remedial System Optimization Process – Increase Plume Capture, Mass Removal and Treat for Chlorinated Volatile Organic Compound (VOC) and 1,4-Dioxane Northeastern BRAC Facility(ABSTRACT)

摘要

This poster presentation will provide a case study and lessons learned on the evaluation, planning, and development of a remedial system optimization strategy for an existing pump and treat system and long-term monitoring program for a chlorinated solvent plume at a Base Relignment and Closure (BRAC) facility in Northeastern United States. The development of the optimization strategy included conducting a remedial system evaluation and updating the conceptual site model using MODFLOW to assess the effectiveness of hydraulic control and dissolved-phase contaminant recovery. The optimization strategy was required to include a treatment remedy for the emerging contaminant, 1,4-dioxane which was reported at concentrations above the State's maximum exposure goal (MEG) in the extracted groundwater. ECC installed a 75 gpm HiPOx TM Advanced Oxidation Unit for the destructive removal of 1,4-dioxane from the groundwater which successfully is treating elevated 1,4-dioxane concentrations (e.g., up to 150 μg/L) to near 'non-detect' concentrations, significantly below the MEG of 32 μg/L. As a result of the Optimization Study, the extraction well network was reconfigured to target hotspot areas within the plume to effectively remove contaminant mass and maintain hydraulic capture to prevent surface water impacts. HiPOx pilot testing successfully demonstrated that the HiPOx system could be used to meet the treatment goals for VOCs and 1,4-dioxane at approximately 50% of the electrical demand associated with the former treatment process.