Monitoring of Water and Contaminant Migration at the Groundwater-Surface Water Interface (ER200422). Final Cost and Performance Report

This is the work of the United States Government and therefore is not copyrighted. This work may be copied and disseminated without restriction. Many SSC San Diego public release documents are available in electronic format at http://www.spawar.navy.mil/sti/publications/pubs/index.html Prepared in cooperation with Naval Facilitites Engineering Service Center, Port Heunerne, CA.

The overall objective of this project was to field demonstrate and evaluate the effectiveness of two technologies for characterizing coastal contaminate migration. The specific objectives of this demonstration were to demonstrate (1) that the Trident probe can be used to help delineate areas where groundwater seepage is occurring and Contaminant of Concern concentrations in those areas, (2) that the UltraSeep system can be used to quantify the flow of groundwater and concentration of contaminants that may be impinging on the surface water system, (3) the technology to end-users to determine the utility of these tools for making decisions at DoD coastal landfills and hazardous waste sites, and (4) the quantification of the costs associated with the operation of each technology. The first demonstration was at Naval Support Activity Panama City. The Trident probe was used successfully to identify areas of groundwater discharge from the site to the surface waters of St. Andrews Bay, and the UltraSeep was used successfully to quantify groundwater discharge rates and volatile organic compound (VOC) discharge concentrations in two discharge zones identified with the Trident probe. The second demonstration was performed at the former Naval Training Center Orlando. The Trident probe successfully identified areas of groundwater discharge from the site to the surface waters of Druid Lake and the UltraSeep successfully quantified groundwater discharge rates and VOC discharge concentrations in two discharge zones identified with the Trident probe. The cost analysis indicated that the cost of an integrated Trident probe/UltraSeep survey is expected to be on the order of $120K, which represents a cost savings of about 42% relative to the estimated cost for the baseline technology of about $210K.