Low levels of PCB detected in oil samples taken from derelict vessel near Camas, Wash.

ASTORIA, Ore. - The 431-foot barge, Davy Crocket, sits aground on the northern bank of the Columbia River near Camas, Wash., Thursday, Jan. 27, 2011. Coast Guard and Washington State Department of Ecology pollution response teams, along with marine inspectors, responded to the scene to check for any possible pollution and determine the overall condition of the vessel. The cause of the grounding is unknown. (Photos by the Washington State Department of Ecology)

The 431-foot barge, Davy Crocket, sits aground on the northern bank of the Columbia River near Camas, Wash., Thursday, Jan. 27, 2011. Photo by the Washington State Department of Ecology

PORTLAND, Ore. — Follow up tests of oil samples taken from a 431-foot derelict vessel, Davy Crockett, have detected low levels of polychlorinated biphenyls (PCBs).

Washington State Dept. of Ecology received reports Thursday of a light, non-recoverable sheen at mile marker 115 on the Columbia River, the site of the vessel. Oil samples taken from the engine room hold of the vessel detected approximately 3.44 parts per million (ppm) of PCBs. Coast Guard, Ecology, Oregon Dept. of Environmental Quality and other agencies responded and are working to cleanup oil and monitor the vessel. Federal regulations for PCBs in oil require specialized handling and disposal for levels at 50 ppm or greater.

Environmental and public health agencies’ regulations vary as to what constitutes acceptable concentrations of PCBs. Federal regulations require that water containing PCBs must be below 0.003 ppm to be discharged to navigable waters. One part per million is roughly the equivalent of one teaspoon per 1,300 gallons.

“The PCB-containing oil released from the barge is not an immediate public health risk,” said David McBride, a toxicologist with the Washington State Dept. of Health (DOH). “Existing advisories warn people to not eat any freshwater shellfish in the lower Columbia River, due to pre-existing contamination from historic releases of PCB.”

“We remind people to avoid direct contact with any oily sheen they may encounter in the water,” said Michael Heumann, an epidemiologist with the Public Health Division at the Oregon Health Authority in Portland.

“Any release of PCBs to the Columbia River is a concern, because it adds to existing PCB contamination in the river,” said Jim Sachet, state on-scene coordinator for the Washington Dept. of Ecology and a member of the unified command team managing the response. “Our main priorities are the safety of the responders and to prevent additional releases of oil.”

A primary and secondary containment area has been established around the vessel, consisting of approximately 18,000 feet of sorbent boom and 2,800 feet of hard boom.

Incident managers have consulted with federal and state environmental agencies, state and county public health agencies and other interested parties regarding the potential effects of the PCBs added to the river on public health and the environment.

For more information on PCBs and their health effects, see http://www.epa.gov/epawaste/hazard/tsd/pcbs/index.htm.

For information on the DOH fish advisory go to http://www.doh.wa.gov/ehp/oehas/fish/.

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