A long-awaited cleanup of the old Waste Disposal Engineering (WDE) Landfill in Andover — one of Minnesota's two most high-risk closed landfills — is shifting into gear.
Workers will start to level and prepare the site on May 15, state pollution officials told legislators this week, with a goal of completing the cleanup by the end of the year.
The task: excavating and hauling away an estimated 6,600 rotting drums and barrels of hazardous gunk buried in a one-third-acre pit at the site. Record keeping at the former dump was lousy, and state pollution regulators running the cleanup aren't sure what they'll find when they dig in.
"There's a lot of unknowns," said Hans Neve, manager of the state's Closed Landfill Program. "This is the No. 1 priority for the program right now."
On Tuesday, about 40 people met for a preconstruction meeting, including representatives from the state Department of Health and the main contractor, Massachusetts-based Clean Harbors Inc. and its subcontractors.
In June, work crews will build a temporary structure to house workers and protect nearby residents from fumes. Excavation starts in July.
Most of the toxic soil, sludge and rotting drums will be placed in new containers or lined dumpsters and shipped by rail to an incinerator in El Dorado, Ark. The resulting ash will be disposed of in Long Mountain, Okla.
Workers will then repair the cap over the pit, which prevents rainwater from percolating through it, and install a well to pump out residual water that may be contaminated for treatment.