The large, 200-plus acre facility was constructed in the early 1960s and used coal and bunker oil as feedstocks for its generators. Wastes generated from this process were often deposited on-site and included coal combustion residuals (CCR), petroleum from spills and leaks, and solid wastes/debris containing a variety of contaminants. Historic disposal practices led to some of these wastes being managed in lagoons and landfills in or adjacent to productive tidal salt marshes.
On behalf of the new Station owner, TRC completed interim and final remedial actions to attain compliance with the State Site Remediation Program regulations and guidance, and completed a complex ecological investigation and risk assessment of the adjacent marshes and drainage ways. Over 90 areas of concern were addressed for soil and groundwater media. The investigation involved sampling soils, groundwater, sediment and biological species, including worms, clams, crabs, fish and small mammals. The analyses focused on metals, with arsenic the primary constituent of concern. Permits from the regulatory agency were obtained to allow intrusive investigations throughout ecological areas of the site.
The results of the ecological investigation and risk assessment indicated no unacceptable risk to wildlife in the marsh and demonstrated the counter-productivity of actively remediating CCR (arsenic, etc.) in an otherwise healthy ecosystem. The Site requires no further remediation under the State’s Site Remediation Program and the investigation resulted in a savings of several million dollars.
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