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Using Membrane Interface Probe Testing as a Critical Tool to Delineate DNAPLs at a Complex Site Setting
Presentation by Ulf M. Lindmark, PE, BCEE, CHMM Long Beach, California, USA
The site under investigation was formerly used as a plating facility from 1962 to 1988. Concurrently during this period, the plating company conducted similar operations on an adjoining property to the south which they owned while they only leased the site.
The site geology generally consists of dense clay to 1.5 meters below ground surface (bgs) transitioning to clay with thin sand/silty sand interbeds at 3m bgs with an underlying denser clay layer from 5 to 6m bgs. In the last 10 years, the depth to groundwater has ranged from 2.4 to 3.4m bgs. Major chemicals of concern are benzene, tetra butyl alcohol (TBA), trichloroethylene and perchloroethylene.
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