[en] Groundwater contained in the 100-NR-2 Operable Unit is contaminated with various radionuclides derived from waste water disposal practices and spills associated with 100-N Reactor operations. Of primary concern is the presence of high levels of ⁹⁰Sr in the groundwater and the discharge of ⁹⁰Sr-contaminated groundwater to the nearby Columbia River through historic river bank seeps known as ''N Springs.'' A pump-and-treat system is being installed to remove ⁹⁰Sr contamination from the groundwater as part of the N Springs expedited response action (ERA). The groundwater extraction system will consist of four extraction and two injection wells with a proposed initial treatment capacity of 50 gal/min. The proposed location of the groundwater extraction system relative to the ⁹⁰Sr groundwater plume is presented