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A metal plating facility in central Kentucky was required to complete a RCRA Facility Investigation to address a number of
Solid Waste Management Units at the site. Twenty monitoring wells were installed at the facility. Ground water from the wells
was sampled for total and dissolved metals, polychlorinated biphenyls, acid extractable compounds, base neutral compounds,
and volatile organic compounds. Unexpectedly, relatively large concentrations of benzene, up to 120 μg/l, were detected in
samples from some of the wells, including wells that should have been hydraulically upgradient from the facility. As a result
of the detection of benzene, the facility completed an investigation to identify the source. A nearby facility had completed
a gasoline underground storage tank (UST) closure at about the time of the installation of the 20 wells. Reportedly the UST
had small holes when removed. Three potential pathways of migration (a ditch, sanitary sewer, and a sink hole) from the nearby
facility to the metal-plating facility and residual soils with very large concentrations of benzene, toluene, ethylbenzene,
and xylenes have been identified. 相似文献