First Environment designed and implemented remedial technologies at a private, industrial property in Bridgewater, New Jersey. The results of extensive investigation activities, some of which were performed by others, revealed the widespread presence of chlorinated volatile organic compounds (CVOC) in the shallow and bedrock aquifer below the property. Our initial task included the installation of additional monitoring wells and performance of a comprehensive, site-wide groundwater monitoring event to horizontally and vertically delineate the extent of contamination in both the shallow and bedrock aquifers. Groundwater sampling techniques included three-volume average purging and Water Flexible Liner Underground Technologies (FLUTeTM). Upon receipt and review of the results, a detailed analysis of possible remedial alternatives to remediate the groundwater plume was completed.
Based on the results of this analysis, the project team determined that the installation and operation of a high vacuum dual phase extraction (HVDPE) system in concert with the installation of an in-situ chemical oxidation (ISCO) groundwater re-circulation system with activated sodium persulfate amendments was the most appropriate technology to address impact to the shallow and bedrock aquifers, respectively. Following the implementation of dual-phase extraction and ISCO pilot tests, and the completion of a step-drawdown/aquifer pumping test, a Remedial Investigation/Remedial Action Workplan (RIR/RAWP) was submitted to the NJDEP along with a Discharge to Groundwater Permit-By-Rule (DGW PBR) Authorization Request Application. The RAWP included design drawings and specifications for both remediation systems.
Following the procurement of the necessary local and State regulatory permits, the systems were installed and operations began in September 2015. Weekly site inspections are performed in order to ensure optimal efficiency with respect to system operation and their ability to treat CVOCs. To evaluate groundwater conditions and the efficacy of the remedial technologies, we will perform quarterly groundwater monitoring events in accordance with the NJDEP DGW PBR.