MILWAUKEE – New information on a big I-Team investigation: the I-Team has uncovered even more problems at a site blamed for contaminating the Milwaukee sewer system.

Just when we thought this story had, for better or worse, resolved itself, TODAY’S TMJ4’s Investigative Reporter Aaron Diamant got a tip this week saying, "you're not going to believe what's going on now."

Turns out...you're not going to believe what's going on now!

Late last month, a hazmat crew in moon suits scooped out, bucket by bucket, hundreds of gallons of PCB tainted sludge from a sump behind the old Milwaukee die-cast plant on city's north side.

"No matter what, it's got to get out of there, and that's really the bottom line,” John Ruetz from Environmental Audits, Inc. said.

It's a big deal because the feds say anything that has a PCB level of more than 50 parts per million is toxic. The muck these guys pulled out had more than 18,000.

TODAY’S TMJ4’s Aaron Diamant: “This wasn't an easy task."

“It's always an adventure,” Ruetz said.

An adventure that's not over yet.

When inspectors showed up at the site last week, they found the sump had filled back up with PCB rich sludge, most likely from old, leaking tanks full of hydraulic fluid under the building.

They also found a second sump full of the same sludge.

Now, the EPA and the Wisconsin DNR ordered the owner to bring the crews back to drain and seal up both sumps, remove the old underground tanks, and take steps to keep any other contaminants inside the building from getting out.

Eventually the whole property will have to get cleaned up, but the EPA said the owners may not have enough cash to do it.

That means the feds, and ultimately taxpayers will most likely have to pick up the rest of the tab.