In 2006, he said, the added cost could reach $1,000 a family.
He said the cost of his treatment had reached £15,000.
For California, these and other medical costs are reaching $1.2 billion a year.
So far, the cost of the closure has reached more than £85m.
By 1990, the cost of transportation alone had reached $22 million.
The cost of the project would eventually reach $7.4 million.
In the worst case, the cost could reach $73 billion and a million jobs, the group said.
By last year, the estimated cost had reached $159 billion.
Scientists and federal officials said the total cost to the government over 10 years could reach $500 million to $1 billion.
The federal costs, he said, could reach $500 million to $1 billion.