Environmental monitoring of remedial dredging at the New Bedford Harbor, MA, Superfund site.
New Bedford Harbor (NBH), MA, is a Superfund site because of high polychlorinated biphenyl (PCB) concentrations in the sediment. From April 1994 to September 1995, a remedial dredging operation (termed the "Hot Spot") removed the most contaminated sediments (PCB concentrations greater than 4000 microg/g) from the upper harbor. During remediation, a monitoring program assessed the potential environmental impacts to NBH and adjacent Buzzards Bay. The monitoring program was developed with input from federal, state, and local authorities. Site-specific decision criteria were established to assess net PCB transport, water column toxicity, and PCB bioaccumulation in blue and ribbed mussels (Mytilus edulis and Geukensia demissa, respectively). The remediation was completed without exceeding PCB net transport or acute toxicity effects specified in the decision criteria. In addition, PCB bioaccumulation in mussels during this time period was not significantly greater than pre- or post-operational measurements. The results indicated that approximately 14000 cubic yards of highly PCB contaminated sediment were permanently removed with minimal environmental effects. The lessons learned during this operation, as well as previous pilot studies at the site, will be used to make full-scale remedial efforts in NBH more efficient and environmentally protective.
Bergen
Barbara J
BJ
Atlantic Ecology Division, Office of Research and Development, U.S. Environmental Protection Agency, National Health and Environmental Effects Laboratory, 27 Tarzwell Drive, Narragansett, Rhode Island, U.S.A. bergen.barbara@epa.gov
Nelson
William G
WG
Mackay
Joseph
J
Dickerson
David
D
Jayaraman
Saro
S
D000818:Animals; D003445:Crustacea / Q000187:drug effects; D004784:Environmental Monitoring; D005306:Fertilization / Q000187:drug effects; D019015:Geologic Sediments / Q000032:analysis; D006256:Hazardous Waste; D008404:Massachusetts; D009026:Mortality; D049879:Mytilidae / Q000187:drug effects / Q000378:metabolism; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000633:toxicity*; D000461:Rhodophyta / Q000187:drug effects; D012617:Sea Urchins / Q000187:drug effects / Q000502:physiology; D012623:Seawater; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000633:toxicity*; D014876:Water Pollution / Q000517:prevention & control
D006256:Hazardous Waste; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls