Floods' Pollutants Within the Norm
Thursday, September 15, 2005
NEW ORLEANS, Sept. 14 -- Early tests on the floodwater that covered most of this city do not suggest it will leave a permanent toxic residue or render residential areas uninhabitable for more than a short time, officials of both state and federal environmental agencies said yesterday.
The pollution consists primarily of fecal matter and slightly elevated concentrations of metals such as lead and chromium that were in the city's soil before Hurricane Katrina. There are also trace amounts of many petroleum-based chemicals and some pesticides.
Despite descriptions of the floodwater as a "toxic soup" and a "witch's brew" of contaminants, the preliminary tests reveal it contains little that is different from what has been seen after past floods in other cities and here.
The exception is a residential area in the suburb of Meraux southeast of the city, where 672,000 gallons of oil leaked from a refinery storage tank. Areas around six smaller oil spills may also require special cleanup, the officials said.
"The early results do not indicate specific toxic pollutants at any levels of concern," said Chris M. Piehler, a senior environmental scientist at the Louisiana Department of Environmental Quality. Asked if residue from floodwaters posed hazards that would keep residents from moving back, he answered: "No. The limiting factor is going to be what structures are going to be salvageable and which ones are not."
Piehler's observations were similar to those of Jerry Fenner, the leader of the environmental health team sent by the Centers for Disease Control and Prevention.
"So far, all the test results show there shouldn't be any long-term problems of health and habitability," he said, adding that the chemical and oil spills "are a special issue and will require abatement."
The generally optimistic view of the experts here contrasted somewhat with the impression given yesterday by Stephen L. Johnson, administrator of the federal Environmental Protection Agency, at a telephone news conference from Washington. Johnson stressed the uncertainty over toxic hazards that remain in flooded parts of the city.
"What we are focused on is assessing what the problems are. It really is impossible to speculate on what it's going to take and how long it's going to take" to clean up environmental problems, he said.
The EPA is taking daily samples of floodwater both in the city and in the outfalls to Lake Pontchartrain. It is also sampling air and wet and dry mud at dozens of locations. Tests from Sept. 3, 4 and 6 showed levels of hexavalent chromium, lead and arsenic exceeding agency standards for drinking water.
"These compounds would pose a risk to children only if a child were to drink a liter of flood water a day. Long-term exposure [a year or longer] to arsenic would be required before health effects would be a concern," said a statement on the EPA Web site.
The city's drinking water comes from the Mississippi River and not from Lake Pontchartrain, where the floodwater is being pumped.