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Passive PE Sampling in Support of In Situ Remediation of Contaminated Sediments

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Technical Report

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RM Parsons Laboratory Cambridge United States

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Our overarching goal was to show PE passive sampling is suited to assessing contaminated sediment sites. Hence, we sought to demonstrate a PE effectively evaluates porewater concentrations of contaminants, b PE can delineate the horizontal and vertical extent of contamination, c PE is suited for long term monitoring, and d the PE passive sampling approach is commercially viable. Laboratory testing showed the PE samplers measured pore waters more accurately than the common commercial practice of using sediment concentrations. PE sampling readily revealed the distribution of sediment contamination by PCBs at the demonstration site. PE samplers showed the site had pgL levels of individual PCBs in pore waters and bottom waters. Sand cap data indicated no upward PCB fluxes through those caps. Finally, QAQC, sensitivity, ease of use, and cost metrics all supported the conclusion that PE passive sampling is commercially viable.

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