Appraisal Assessment of Geology at a Potential Black Roack Damsite. December 2004

摘要

The original Black Rock Damsite was investigated by a private engineering consulting firm in 2002 and 2003. The study suggested that a more suitable damsite may lie west of the original study area. Based on the available understanding and mapping at the time, the location further west was thought to be less complicated due primarily to the presence of a potential north-south fault thought to place the bedrock nearer the ground surface. Bureau of Reclamation forces performed investigations at the alternate Black Rock Damsite in 2003 and 2004. These investigations included drilling holes to determine the depth to bedrock along the alternate alignment, drilling a single core hole to obtain samples of the deep foundation to determine engineering characteristics and provide a pilot hole for a ground-water test hole, and performing a reconnaissance survey for borrow materials.