LOCKPORT – City Judge Thomas M. DiMillo delayed sentencing again last week for a Texas company whose plans to renovate the shell of a Mill Street building were blocked by the discovery of asbestos.

Liberty Plant Maintenance is scheduled to return to court Dec. 20. The company, owned by a former Dunkirk man, Scott J. Krzyzanowski, was found guilty by default, because it did not contest the charges, of leaving the building and a Dumpster filled with asbestos-containing materials unattended since the fall of 2010.

The U.S. Environmental Protection Agency has since stepped into the case, fencing off the site and finding arsenic in soil samples near the former power plant for a defunct paper mill. Two years ago, Liberty’s cleanup of 89 Mill St. was blocked by the state Labor Department’s demand for an asbestos study.

“It’s still an unsafe structure. The general violations have been not been removed,” Deputy Corporation Counsel Matthew E. Brooks said. “The city doesn’t care who pays for it – the defendant or the federal government. We just want to see some progress.”