Wisconsin Administrative Code
Department of Natural Resources
NR 600-699 - Environmental Protection - Hazardous Waste Management
Chapter NR 667 - Standards For Owners And Operators Of Hazardous Waste Facilities Operating Under A Standardized License
Subchapter G - Closure
Section NR 667.0116 - What shall I do with contaminated equipment, structure and soils?

You shall properly dispose of or decontaminate all contaminated equipment, structures, and soils during the partial and final closure periods. By removing any hazardous wastes or hazardous constituents during partial and final closure, you may become a generator of hazardous waste and shall handle that waste following all applicable requirements of ch. NR 662.