It's been a little more than two weeks since the US Environmental Protection Agency unveiled its proposal for cleaning up the toxic Portland Harbor, and all anyone can seem to agree on is that the plan is flawed.

Environmental advocates were first to that party, bemoaning the fact that the $746-811 million cleanup plan would leave around 87 percent of the 2,200-acre Superfund site completely untouched.

And we got the first taste of polluters' take on the plan earlier this week, when the Port of Portland released a letter it had sent to an EPA official in Seattle [PDF]. The Port, which owns and operates badly polluted property in the Superfund, thinks the EPA wants to remove too much of the harbor's toxic muck, and is questioning the agency's wildly shifting cost estimates for the project.

As Port of Portland Deputy Executive Director Curtis Robinhold told the Mercury this week: "We think there are ways you can clean up the river for lower costs."

Then this morning, Portland Harbor Community Coalition (PHCC), a collection of 12 groups that work with a range of disadvantaged communities in the city, planned to air their own grievances over the plan in a press conference.

Those concerns may result in changes to the ultimate plan for cleaning the 10-mile Superfund, which stretches roughly from the Broadway Bridge to the Columbia Slough. But for now, there's just one concrete change. The EPA announced this morning it's extending by a month the public comment period on the proposal. That means polluters, environmentalists, and the general public now have three months to research the plan and air grievances, rather than two.

The move is a response to "numerous public requests," according to the EPA. Some of the loudest of those have come from the Audubon Society of Portland and Willamette Riverkeeper, which have argued that limiting comment to the sunny months when people are bound to be distracted by summer is unfair. Those groups have pushed for a 120-day comment period rather than the planned 60 days.

The EPA's decision increases the likelihood that a finalized plan won't be finished by the end of the year. Officials have warned not meeting that deadline could make an already long process even longer (this cleanup plan is 16 years in the making), since a Clinton or Trump administration could throw a wrench in the works. In unveiling the proposed plan June 8, the EPA said it was still possible to land on a final cleanup strategy by New Years. It's unclear whether that's still the case.

Comments now have to be postmarked (or emailed) by September 6. Send them to harborcomments@epa.gov, and attend one of the public meetings EPA is holding—including one all day today, at the Portland Building.