The federal agency overseeing offshore petroleum drilling says it has corrected flaws in environmental work done ahead of a 2008 lease sale in the Chukchi Sea.
Environmental and Alaska Native groups disagree, saying the Bureau of Ocean Energy Management still has not addressed crucial information gaps, such as how to clean up a spill in ice-choked waters.
The groups are appealing to Interior Secretary Ken Salazar to delay proposed drilling by Shell Oil and others in the Chukchi.
The federal agency Thursday released a final supplemental environmental review and said it addresses concerns raised by a federal judge in July 2010.
The federal agency held public hearings in Alaska communities and received more than 360,000 comment letters or cards.
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