title: Screening level assessment of risks due to dioxin emissions from burning oil from the BP Deepwater Horizon Gulf of Mexico spill.
abstract: Between April 28 and July 19 of 2010, the U.S. Coast Guard conducted in situ oil burns as one approach used for the management of oil spilled after the explosion and subsequent sinking of the BP Deepwater Horizon platform in the Gulf of Mexico. The purpose of this paper is to describe a screening level assessment of the exposures and risks posed by the dioxin emissions from these fires. Using upper estimates for the oil burn emission factor, modeled air and fish concentrations, and conservative exposure assumptions, the potential cancer risk was estimated for three scenarios: inhalation exposure to workers, inhalation exposure to residents on the mainland, and fish ingestion exposures to residents. U.S. EPA's AERMOD model was used to estimate air concentrations in the immediate vicinity of the oil burns and NOAA's HYSPLIT model was used to estimate more distant air concentrations and deposition rates. The lifetime incremental cancer risks were estimated as 6 × 10(-8) for inhalation by workers, 6 × 10(-12) for inhalation by onshore residents, and 6 × 10(-8) for fish consumption by residents. For all scenarios, the risk estimates represent upper bounds and actual risks would be expected to be less.
authors.affiliation: US EPA, Office of Research and Development, Washington, DC, United States. schaum.john@epa.gov
authors.forename: John
authors.initials: J
authors.lastname: Schaum
authors.forename: Mark
authors.initials: M
authors.lastname: Cohen
authors.forename: Steven
authors.initials: S
authors.lastname: Perry
authors.forename: Richard
authors.initials: R
authors.lastname: Artz
authors.forename: Roland
authors.initials: R
authors.lastname: Draxler
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Frithsen
authors.forename: David
authors.initials: D
authors.lastname: Heist
authors.forename: Matthew
authors.initials: M
authors.lastname: Lorber
authors.forename: Linda
authors.initials: L
authors.lastname: Phillips
mesh_terms: D000392:Air Movements; D000818:Animals; D001572:Benzofurans / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D055884:Chemical Hazard Release; D000072338:Dibenzofurans, Polychlorinated; D004781:Environmental Exposure / Q000032:analysis / Q000706:statistics & numerical data; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D052918:Environmental Restoration and Remediation; D019652:Extraction and Processing Industry; D005399:Fishes / Q000378:metabolism; D006801:Humans; D017745:Incineration; D008956:Models, Chemical; D009792:Oceans and Seas; D010578:Petroleum / Q000032:analysis*; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D018570:Risk Assessment / Q000379:methods
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants; D010578:Petroleum; D000072317:Polychlorinated Dibenzodioxins