NEW ORLEANS — BP’s massive oil spill became the largest ever in the Gulf of Mexico on Thursday based on the highest of the federal government’s estimates, an ominous record that underscores the oil giant’s dire need to halt the gusher.
The oil that’s spewed for two and a half months from a blown-out well a mile under the sea hit the 140.6 million gallon (532 million liter) mark, eclipsing the record-setting, 140-million-gallon Ixtoc I spill off Mexico’s coast from 1979 to 1980. Even by the lower end of the government’s estimates, at least 71.7 million gallons (271 million liters) are in the Gulf.
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The growing total is crucial to track, in part because London-based BP PLC is likely to be fined per gallon spilled, said Larry McKinney, director of Texas A&M University at Corpus Christi’s Gulf of Mexico research institute.
“It’s an important number to know because it has an impact on restoration and recovery,” McKinney said.
The oil calculation is based on the higher end of the government’s range of barrels leaked per day, minus the amount BP says it has collected from the blown-out well using two containment systems. BP collected a smaller amount of oil than usual on Wednesday, about 969,000 gallons (3.7 million liters).
Measuring the spill helps scientists figure out where the missing oil is, hidden below the water surface with some even stuck to the seafloor. Oil not at the surface damages different parts of the ecosystem.
“It’s a mind-boggling number any way you cut it,” said Ed Overton, a Louisiana State University environmental studies professor who consults for the federal government on oil spills. “It’ll be well beyond Ixtoc by the time it’s finished.”
The BP spill, which began after the Deepwater Horizon drilling rig explosion killed 11 workers April 20, is also the largest spill ever recorded offshore during peacetime.
But it’s not the biggest in history.
That happened when Iraqi forces opened valves at a terminal and dumped as much as 336 million gallons (1.3 billion liters) of oil in 1991 during the Persian Gulf war, according to the National Oceanic and Atmospheric Administration. Initial estimates put that spill at about 460 million gallons (1.7 billion liters) , but government estimates later found it to be smaller.
As the Gulf gusher neared the record, Hurricane Alex whipped oil-filled waves onto the Gulf Coast’s once-white beaches. The government has pinned its latest cleanup hopes on a huge new piece of equipment: the world’s largest oil-skimming vessel, which arrived Wednesday.
Officials hope the ship can scoop up to 21 million gallons (80 million liters) of oil-fouled water a day. Dubbed the “A Whale,” the Taiwanese-flagged former tanker spans the length of 3 1/2 football fields and is 10 stories high.
It just emerged from an extensive retrofitting to prepare it specifically for the Gulf.
The vessel looks like a typical tanker, but it takes in contaminated water through 12 vents on either side of the bow. The oil is then supposed to be separated from the water and transferred to another vessel. The water is channeled back into the sea.
But the ship’s never been tested, and many questions remain about how it will operate. For instance, the seawater retains trace amounts of oil, even after getting filtered, so the Environmental Protection Agency will have to sign off on allowing the treated water back into the Gulf.
“This is a no-brainer,” Overton said. “You’re bringing in really dirty, oily water and you’re putting back much cleaner water.”
The Coast Guard will have the final say in whether the vessel can operate in the Gulf. The owner, shipping firm TMT Group, will have to come to separate terms with BP, which is paying for the cleanup.
“I don’t know whether it’s going to work or not, but it certainly needs to be given the opportunity,” Overton said.
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