The U.S. Environmental Protection Agency has come out against Governor Brown's plan for twin tunnels in the Delta, saying it might violate federal law.

In 43 pages of comments, researchers say spending tens of billions of dollars for three new intakes along the Sacramento River could increase concentrations of salinity, mercury, bromide, and pesticides -- harming fish and violating the Clean Water Act.

Overall, the agency says it appreciates the broad concept of trying to restore the ecosystem while addressing diversion issues, but draining out fresh water isn't the answer.

Earlier this week, the state revealed that it was delaying the release of environmental studies so portions of the plan could be re-written. Officials have not revealed which parts are of a concern.

Draft environmental reports totaled some 40,000 pages.