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Following the grounding of the barge Morris J. Berman on the northern coast of Puerto Rico in January 1994, conditional approval for the use of the shoreline cleaner Corexit 9580 was granted. One requirement was the inclusion of biological effects monitoring, particularly during the first operational application. This was intended to safeguard against unforeseen ecological consequences from the treatment—to answer the question, does the use of Corexit 9580 result in adverse biological impact beyond that caused by the oil itself? The monitoring was designed to provide immediate operational feedback (Should the application continue?) but also addressed other questions of interest for future incidents and for further research. Study sites were surveyed before, immediately following, and one day after treatment with Corexit 9580. No significant nearshore effects were observed, and the monitoring team recommended that operations proceed. Followup studies of organisms transplanted into the treatment area also showed few exposure-related effects. Measurable concentrations of both Corexit and oil were found in water samples collected in the treated area, and low levels of hydrocarbons were also found in sea urchins exposed to treatment runoff water. The toxicological significance of the exposure and the tissue residues were beyond the scope of this monitoring effort, but the lack of mortalities in both resident and transplanted organisms suggested a relatively minor short-term biological effect on exposed communities.

BIOLOGICAL EFFECTS MONITORING DURING AN OPERATIONAL APPLICATION OF COREXIT 95801