SCP CARLSTADT HDPE / SLURRY WALL CONTAINMENT SYSTEM
Langan provided RI/FS/RD, construction oversight and program management services to the Potential Responsible Party (PRP) Group for this Superfund Site located in an industrial/commercial area near the Meadowlands Sports Complex. The 6-acre site had operated as a solvent recovery facility prior to ceasing operations in 1980 and contaminants are present as both residual and free phases (sludges, DNAPLs) in the soil and groundwater. An interim remedy, developed as a result of a value engineering process applied by Langan to provide containment, consists of a perimeter soil/bentonite slurry wall with a high-density polyethylene (HDPE) membrane insert (both keyed into a clay layer), an HDPE temporary cap, and extraction and off-site treatment of contaminated groundwater from within the containment. The Interim Remedy effectively isolated the site from the surrounding environment including an adjacent creek. Langan provided engineering inspection and technical oversight during construction of the Interim Remedy and researched and evaluated numerous treatment technologies for applicability as components of a permanent remedy, including insitu and exsitu stabilization of organic and inorganic wastes.