Case study: The observational approach and fast‐track remediation at NSB kings bay

Abstract

AbstractRemediation of groundwater at NSB (Naval Submarine Base) Kings Bay proceeded from problem identification to groundwater treatment within a 22‐month period. This rapid implementation schedule resulted from application of observational approach methods to project management and technical decision making.Finding that groundwater containing volatile organic compounds (VOCs) such as vinyl chloride and dichloroethene was migrating off base property, base authorities and ABB Environmental Services, Inc. (ABB‐ES) established a fast‐track investigation/remediation program embodying the ideals of the observational approach. The investigation/remediation program of NSB Kings Bay Site 11 has proceeded in three phases. The first stage of the investigation/remediation program was implemented to confirm the existence of the chlorinated VOCs in site groundwater. The second phase of the investigation/remediation program was initiated to halt further contamination migration and to further delineate groundwater contamination. The third stage of investigation/remediation, source reduction and final remediation selection, is currently under way.The uniqueness of the Kings Bay investigation/remediation program is in the approach to the problem. Compared to the traditional approach, which would have required a more comprehensive groundwater sampling and analysis program prior to remediation, the investigation/remediation approach applied at NSB Kings Bay allowed remediation to proceed on a more expeditious schedule, with an accepted amount of uncertainty derived from first‐stage groundwater data. It was also understood that modifications to the system would be made when deviations to the most probable conditions arose. As a result, contaminant migration has been effectively controlled, while further site investigation and source reduction evaluation have proceeded.