San Diego, CA 92152--5001

This report summarizes the work conducted to demonstrate and validate the use of the Benthic Flux Sampling Device (BFSD) for quantifying in situ metal contaminant mobility in marine sediments. A complete description of the equipment, processes, and methods is given. Test and demonstration results along with analysis and interpretation are included in the report. Performance and cost analysis is also included. The specific objectives of the project were as follows: 1. Evaluate the quality of water samples collected using the BFSD, specifically for use in determining if a statistically significant flux was occurring at the test locations in comparison to the blank flux results for the BFSD. 2. Evaluate the BFSD for repeatability. 3. Evaluate the logistical and economic resources necessary to operate the BFSD. 4. Evaluate the range of conditions in which the BFSD can be operated. The California Environmental Protection Agency's Technology Certification Program was selected for independent evaluation of the performance objectives. A set of detailed performance claims that embodied the above project objectives were established. A replicate series of three full system blank equipment tests were conducted to statistically establish system baseline performance. Two formal demonstrations were then conducted with evaluator oversight. The demonstrations used contaminated sites in San Diego Bay, CA, and in Pearl Harbor, HI, where fundamental differences allowed the evaluators a broad set of results to compare with claimed performance. Standardized processes and methods were followed. Pre- and post-deployment preparations, logistics, material, and labor costs were also evaluated. The project met its objectives. The two demonstrations were successful and provided evaluators adequate ..