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Toxic sludge and treasures in Lake Okeechobee
Thousands of years of history were revealed this summer as drought drained the water from Lake Okeechobee in the Florida Everglades. Native American tools and jewelery, a hundred year old fishing boat, and ancient human remains are just a few of the things that archaeologists have pulled from the lake's muddy, expanding shores.
The legacy of more recent years of habitation around the lake? Toxic muck left over from years of dumped wastewater and litter (big litter. We're talking about tractor tires and speedboat motors). Isn't it nice to know how we'll be remembered?
The nice part of having the toxic mess exposed is the opportunity to clean it up:
In little more than two months, contractors with the South Florida Water Management District have hauled away 2 million cubic yards of sludge — enough to fill nine football stadiums from the field to the nosebleed seats, said Tom Debold, water district supervisor on the muck-removal project.And that was only 2% of the estimated total muck (ETM -- it's a technical term).
The wastewater management team and the Army Corps of Engineers had been hoping to be able to sell the sludge as landfill for construction, but it turns out the stuff is just too toxic. At 9 milligrams per kilogram, the arsenic content is more than four times the residential limit for fill. There isn't much to be done with it; at the moment, it's sitting in piles waiting for the environmental okay and Army Corps permit to be buried in trenches in the levee.
They're building a museum to contain all the artifacts found on the site. Think they'll include a nice big hermetically sealed container of toxic sludge?
Comments
God that's awesome. Not that they have all that toxic muck (what a great word that is), but it's so absolutely phenominal as a fossil record of a sort of our progression (regression?) as a society.
No word on arsenic sources in the news articles I've seen. Does anyone know what the sources are (Munitions, treated wood, old pesticides)?
Nice catch.
Posted by: AngryToxicologist | July 20, 2007 1:35 PM
According to the LA Times, "scientists discovered that much of it contains excessive levels of arsenic from pesticides and fertilizers used until the 1960s."
So, a small part of me is relieved that we're not using those pesticides and fertilizers anymore -- but mostly I'm just horrified that there are still such high levels left over from before 1960. That stuff has staying power!
I'm with you, though. They found some really amazing stuff amidst the muck.
Posted by: Amanda | July 20, 2007 1:53 PM