Project management plan, N Springs expedited response action

摘要

In accordance with the past-practice strategy, the US Department of Energy (DOE) is conducting an expedited response action (ERA) at the N Springs, located in the Hanford 100 N Area. This Project Management Plan (PMP) addresses the design and construction of a sheet pile barrier and the design, construction, and operation of an ion-exchanged pump and treat system at N Springs. There were three objectives set for the N Springs ERA, which are outlined in Item 6 in the Senior Executive Agreement Committee Agreement on the Resolution of Milestone M-14-00 Change Request Dispute. The first N Springs ERA objective is to eliminate or substantially reduce the flux of strontium-90 to the N Springs, and ultimately to the Columbia River via groundwater migration. A sheet pile barrier will be installed in the path of groundwater flow, forcing strontium-90 contaminated groundwater to flow around it in order to reach the river, substantially decreasing groundwater flow velocity. Since the strontium transport velocity is approximately 2 orders of magnitude less than that of the groundwater in the vicinity, the flux of strontium-90 to the river will be reduced. The second N Springs ERA objective is to evaluate commercially available treatment options for strontium-90 contaminated groundwater. The third N Spring ERA objective is to provide data necessary to set appropriate strontium-90 contaminated groundwater cleanup standards.