Monitoring of Water and Contaminant Migration at the Groundwater- Surface Water Interface (ER200422); Final rept

摘要

The objective of this project was to field, demonstrate and evaluate the effectiveness of two technologies for characterizing coastal contaminate migration, specifically (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) demonstrate 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 quantify the costs associated with the operation of each technology. The Trident probe was used successfully at NSA Panama City to identify areas of groundwater discharge from site to 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. 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. The demonstration at the NSA Panama City documented additional cost avoidance of about $1.25M based on support for selection of Monitored Natural Attenuation as the corrective action at the site. The Trident probe and UltraSeep have generally found strong acceptance by stakeholders and end-users.