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A <br /> Project Descriptions AdrianBrown <br /> REMEDIATION OF TCE CONTAMINATION, NEW JERSEY <br /> AdrianBrown was retained to develop remedial options for groundwater and unsaturated sediments at <br /> an industrial facility in New Jersey. Groundwater in a fractured shale aquifer and the overlying <br /> unsaturated,weathered shales had become contaminated by historical industrial activities. Our client <br /> had assumed responsibility for this previous contamination at the site through a series of corporate <br /> mergers and acquisitions. <br /> The initial phase of this project included a comprehensive review of approximately 10 years of <br /> monitoring data, followed by evaluation of an existing groundwater containment system. We <br /> determined that the existing system was preventing off-site migration of TCE that had originated within <br /> the facility boundaries. We also found that a portion of the TCE being removed by the groundwater <br /> extraction system was coming from previously unidentified off-site sources. <br /> Following the initial evaluation of the site,AdrianBrown assisted in the preparation of a work plan for <br /> a supplementary investigation to obtain data necessary for further remedial design. Using the data <br /> developed during that investigation,we prepared and submitted a work plan for additional remedial <br /> activities. This work plan includes use of air sparging and soil vapor extraction to remediate the source <br /> areas, with the ultimate objective of ceasing the containment pumping at the site. Potential difficulties <br /> posed by the fractured aquifer and unsaturated zone will be addressed through the use of angled <br /> boreholes to intercept the fracture zones and maximize TCE removal rates. <br /> AdrianBrown performed a groundwater flow and transport modeling study to demonstrate the potential <br /> migration of TCE from residual on-site and off-site sources following the conclusion of the planned <br /> remedial action. Several scenarios were addressed,showing the potential effects of the off-site sources <br /> identified during the previous evaluations. These studies,combined with the data developed during the <br /> supplementary investigation, were used to develop estimates of background concentrations that are <br /> affecting the on-site remedial action. <br /> Recently,AddanBrown has assumed responsibility for the routine quarterly monitoring at this site. <br /> The state regulatory agency has accepted our proposal to reduce the number of monitoring wells and <br /> install a dedicated bladder-pump system at the site. These modifications to the existing monitoring <br /> network are expected to result in significant cost savings over the life of the project. <br /> A comprehensive pilot study was conducted to assess the feasibility of air sparging and soil vapor <br /> extraction as viable technologies for remediation. Performance data was collected during the pilot study <br /> to prepare a full-scale design. Two independently operated subsytems were installed to target <br /> remediation to specific site areas. The systems are currently being operated,and monitored for <br /> performance. To enhance system performance, and expedite the remediation process, a program of <br /> pneumatic fracturing of the remediation wells was recently completed. <br />