top of page


ACR conducted Class III survey of over 15,000 acres for a proposed land exchange between The Thunder Basin National Grassland and a private grazing cooperative. This project allowed for the exchange of 'land-locked' federally owned land parcels for plots of land contiguous with existing federal holdings. The parcels ranged in size from dozens of acres to over a Section (square mile) in size. Many of the parcels were located in remote and rugged areas with little to no road access. ACR's crack team of archeologists surveyed the entire project area to Class III standards on time and under budget, all while finding more archeological sites than predicted. 

As a prerequisite for a coal mine expansion, ACR conducted a geoarchaeology study of a prehistoric site complex consisting of several NRHP eligible prehistoric sites. ACR directed the excavation of backhoe trenches on selected landforms in order to piece together the recent geomorphic history of the area. ACR collected radiocarbon and optically stimulated luminescence (OSL) samples for chronometric dating of key stratigraphic layers and mapped soil sequences vertically and across the study area. ACR determined the depth and extent of sediment packages with the potential to contain buried artifacts and features. These findings were based on the interpreted age and energy regime of stratigraphic units in the study area.  

ACR's archaeologists worked in the grid supporting a UXO identification and recovery project at the Vancouver Barracks site in eastern Washington. ACR's embedded UXO Tech 1 archaeologist allowed for maximum project efficiency, differentiating between historic artifacts and other recovered metal debris  during intrusive operations. Historic components were documented thoroughly and promptly, allowing dig teams to continue work without interruption while maintaining compliance with federal regulations.