The U.S. Army Corps of Engineers has started seeking information on potential vendors that could provide remedial action construction, or RAC, support for the Iron King Mine–Humboldt Smelter, or IKM-HS, Superfund Site in Dewey-Humboldt, Arizona. According to a sources sought notice published Thursday, USACE plans to award a potential five-year, $249 million indefinite-delivery/indefinite-quantity contract for