The US Army Corps of Engineers (USACE), Seattle District, is seeking interested business sources for a project titled: "Formosa Mine Remedial Action Capping Project at Riddle, OR." The proposed project will be firm fixed-price and is predominantly construction (at least 51%). The magnitude is estimated to be in the range of $25,000,000 and $100,000,000. The project scope of work consists of activities necessary to implement primarily the earthwork-related requirements of the EPA's Record of Decision for the Formosa Mine Superfund Site Operable Unit (OU) 1. The objectives of the OU1 remedial action are to remove, consolidate, and restrict or minimize the interaction of contaminant source materials with precipitation, surface water runoff, and groundwater. • Stabilizing the steep encapsulation mound (EM) slopes with gabion walls • Development of a clean materials borrow area and non-primary mine disturbance area (PDMA) mine material repository • Grading and consolidation of mine materials in the non-PMDA mine material repository • Impermeable cover construction on the EM, former ore storage/million-gallon storage tank, and non-PMDA mine material repository • Grading, amendment and revegetation of mine materials at the area southwest of the EM, and Formosa Adit 2, Formosa Adit 3, and 1090 Raise waste rock dumps (WRD)s • Excavation of mine materials from roads, reconstruction of roads within the project limits, and construction of a steep slope northwest (NW) access road for gabion wall placement