Environmental groups, BP and the U.S. Coast Guard reached tentative agreement on Friday on measures to prevent sea turtles from being incinerated alive in controlled burns of spilled oil in the Gulf of Mexico.

The deal would settle a lawsuit accusing BP of violating the U.S. Endangered Species Act and terms of its lease with the federal government for the deep-sea well that ruptured on April 20, unleashing the worst offshore spill in U.S. history.