It is not yet clear how much the city will ultimately pay for the project, however. The U.S. Environmental Protection Agency has estimated cleanup costs at $1.2 billion. It is supposed to be paid by over 150 potentially responsible parties who are believed to have contributed to the pollution.
But negotiations with the EPA over how much each party will pay are confidential and could take many years to complete.
Portland has already paid more than $50 million to help plan the cleanup and may pay much more to help complete it.
Read more at the Portland Tribune.