32 Discovery Dr.
Bozeman, MT 59718
SAM UEI: LYARYWD1YSZ1
CAGE: 1GHU7
As part of its contract with Region One of the USFS, AESI provided geotechnical engineering, civil engineering, and construction management services for the Riley Pass Reservoir and Sediment Pond Cleanout and Dam Reclamation project. The Riley Pass Uranium Mine site is located in the Custer Gallatin National Forest in Harding County, South Dakota. Uranium mining activities during the 1950s and 1960s led to an accumulation of overburden material. Due to the highly erosive nature of the unconsolidated spoils, sediment loading to nearby watersheds and existing reservoirs became problematic. The USFS constructed sediment ponds in several of the drainages which required sediment removal and dam safety upgrades. This project’s scope of work included the following items: