The cleanup is finished on two tracts of land covering nearly 28 acres at the former Bethlehem Steel site, the state Department of Environmental Conservation announced.
That will allow the once-contaminated parcels to be developed.
Tecumseh Redevelopment, under DEC oversight, excavated and removed fill laced with arsenic, petroleum and other contaminants from the pair of sites at 2303 Hamburg Turnpike earlier this year, according to a DEC Fact Sheet.
The site is roughly across the street from the NOCO Express Shop in Lackawanna.
The two parcels comprise a fraction of the 148 acres under purchase agreement by a redevelopment agency controlled by Erie County.
Future uses for the property will be restricted to commercial or industrial use and tapping into groundwater will be prohibited, the DEC reported.