Free phase dense nonaqueous-phase liquid (DNAPL) was identified within 10 feet of a surface water body (pond) at a site where groundwater is being investigated for chlorinated organics impacts. The DNAPL is thought to have originated from industrial landfilling activities that occurred prior to 1960. The areal extent of DNAPL was delineated using soil borings and visual inspection of the sand/clay interface. The constituents of the DNAPL include approximately 40% trichloroethene (TCE) and up to 1.5% polychlorinated biphenyls (PCBs). An impermeable sheet pile wall was installed to prevent the DNAPL from migrating into the pond. The wall was designed to stop the migration of DNAPL while a permanent remedy could be evaluated and implemented.
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