The total cleanup cost to the taxpayers, in today's dollars, was nearly two hundred billion.
But only about $9.5 billion for direct cleanup costs is estimated as likely to be spent this year.
He said that if the cleanup cost more, the company would be required to pay it.
The cleanup costs are estimated at a minimum of $35 billion.
"That leak cost the building about $30,000 in cleanup costs."
The company estimates its share of the total cleanup cost at $850 million.
It was the Government's first estimate of the full cleanup cost.
Usually, the state's share of cleanup costs would be just 10 percent.
It is estimated that the cleanup costs could be more than £100 million.
The department said cleanup costs were covered by the settlement.