Publication Summary

Historically, Ecology has interpreted the Used Oil Management Standards to allow waste generated from processes that remove residual oil from mechanical parts to be managed as used oil. In consultation with the US EPA, Ecology is revising its policy to come into agreement with the Federal interpretation. Wastes generated from processes that remove residual oil (high flash solvent part washers, caustic dip tanks, etc.) or are contaminated with residual oil (cleaning rags, etc.) may no longer be managed as used oil. The wastes are solid wastes subject to the designation process to determine if the wastes should be managed as dangerous wastes.