The new levee system going up around New Orleans will require enormous amounts of clay -- enough to fill 20 Superdomes -- but the Army Corps of Engineers says it will dig in wetlands only as a last resort. The promise came in a meeting held Tuesday between Corps officials and environmental groups worried that the rush to build the levees would end up harming the environment. Tough new soil standards implemented after Hurricane Katrina require the Corps to build the levees using a particular type of clay known as "borrow."

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