Allen, has sent a letter to BP Group executive Bob Dudley approving the procedure to permanently plug the well that has spewed oil into the Gulf Of Mexico but outlining conditions to be met.
In the letter to Dudley, Allen said that based on meeting with the Government Scientific Technical Team on Wednesday, he was authorizing the company to "proceed with the course of action to replace [the] BOP."
Allen said the procedure will likely begin "some time the week after Labor Day".
But Allen did set conditions on swapping the temporary cap with a much stronger one including "preserve the forensic and evidentiary value" of the BOP.
Various civil suits have been filed against BP and the federal government has also announced a criminal probe into the incident.
The directive can be viewed here.