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"If there is significant discharge of persistent chemicals or of heavy metals, that can settle into the sediments, which can be re-stirred up every time there is a big storm or dredging or construction activity,” said Mr. Olsen. “That can re-suspend the sediments and cause re-contamination."
Even worse, the pollution runoff could poison the Gulf of Mexico, whose fisheries are already threatened by chemical runoff from Midwestern U.S. farms. Mr. Olsen speaks of a dead zone in the Gulf, where algae blooms and oxygen is depleted.
"That already exists, and as we see more and more of this raw sewage and runoff and toxic chemicals just coming in a huge wallop all at once, we could exacerbate that dead zone and the fisheries could suffer long term losses," he added.
U.S. health and environmental officials acknowledge the potential long term impact of pollution from southeastern coastal areas, but say that their short term focus is protecting the health of evacuees and those still remaining in flooded areas
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