Sampling Results Clause Samples

Sampling Results. Furan and dioxins (measured as toxicity equivalent (TEQ) levels) are the primary constituents of interest in sediments on the Reach MM Island. To characterize the distribution of TEQ in the river sediments, sampling was conducted as part of the Tittabawassee River Site Investigation. Sample results included a maximum detected concentration for furans and dioxins of 17,500 parts per trillion (ppt) TEQ. Sample locations are presented on Figure 1. Figures 2a through 2c present cross sections of the bathymetry and available analytical data in the area of the Reach MM Island. Additional monitoring was performed in December 2010 as part of Task 2.2 of the 2010 AOC, to more fully characterize the banks of the Island. A representative composite sample of sediment collected along the banks of the Reach MM Island identified a TEQ level of approximately 6,800 ppt. As required by paragraph 16a of the Reach MM Island AOC, Dow is providing additional data which was collected in June, 2011 to delineate TEQ levels surrounding the island. Samples were collected in the channel surrounding the island along the transects shown in Figure 1. A composite sample was collected from the emergent portion of the island, over the depth range of 0 to 7.4 feet below the top of the island. This composite sample had a TEQ level of 6,750 ppt. In total, 43 samples were collected and analyzed from the island or in the area immediately surrounding the island, and delineated the extent of TEQ levels in the immediate vicinity of the Reach MM Island to provide the basis for design.