1. Review existing information on sediment analysis; 2. Collect and review historic documents from the USGS, the Interstate Commission on the Potomac River Basin, NOAA, EPA and other relevant agencies to understand the historic erosion/deposition and contamination landscape above and below the dam; 3. Assess the need for additional borings/samples; 4. Perform sampling and testing similar to that described in the June 2015 study carried out by the Maryland Geological Survey, both above and below the dam, consistently with the Sampling Protocol provided below; 5. Collect hydrodynamic data (e.g., flow, water surface elevation, and acoustic doppler current profiler (ADCP) transects of the water velocity structure) to establish baseline hydrodynamic conditions upstream of the Dam, near the face of the Dam above and below the Dam, and downstream of the Dam. 6. Using the sampling and testing results, the selected contractor will propose and develop a statistically sound geospatial representation of the bed sediment distribution and contaminant field both above and below the Dam. The initial sampling will also be used to suitably partition the river reaches into segments to summarize contamination, bioaccumulation, and modeling results. 7. Based on the sampling and testing results, and the geospatial representation of the sediment contamination, and experience with other similar dam removal projects, the selected contractor shall provide analysis of alternatives and recommendations for the proper sediment management associated with the dam removal project. The firm will also conduct hydrodynamic, sediment transport, and water quality modeling and visualization of the contaminant fate and transport post dam removal to determine the severity of contaminated sediment flushing problem post-removal, and the effectiveness of the proposed sediment management recommendations. It is expected that the ACOE, MDE, and DNR will participate in the selection of the proper sediment management strategy to be employed in connection with the Dam’s removal.
