POTTS PROPERTY SUPERFUND SITE
WILMINGTON, DELAWARE
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Duffield Associates was engaged by the potentially responsible parties to perform a Remedial Investigation and Feasibility Study (RI/FS) for the Potts Property, formerly a Federal Superfund Site and now a Hazardous Substance Cleanup Act (HSCA - Delaware's Superfund Program) site along the Christina River.

Due to the industrialized nature of the site and other nearby Superfund sites, Duffield Associates' RI/FS Work Plan limited the investigation of the former metals refinery to site soils and shallow groundwater. Remedial issues related to contaminated groundwater migration toward the Christina River were evaluated and successfully demonstrated to not be of concern.

The FS was focused on assessing the applicability of an array of technologies. Soil samples were obtained from Geoprobe corings and backhoe excavated test pits. Groundwater samples were obtained from selected existing monitoring wells and temporary Geoprobe installed well points. Quality Assurance, Quality Control, and Chain of Custody procedures were performed in accordance with HSCA protocols. Existing and potential exposure pathways and substance behaviors were evaluated and used to assess risks posed by the substances detected at the site.

Duffield Associates developed remedial action objectives based on the RI findings and used them to screen the remedial alternatives for effectiveness. The recommended remedial action called for a combination of low permeability capping, and covering.

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