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- W2120943077 abstract "Our group is collaborating with the Metropolitan Water Reclamation Dis- trict of Greater Chicago, the Wetlands Initiative, and Patrick Engineering to install field scale active capping demonstration projects in Collateral Channel and in the Chicago River. The Collateral Channel site is a channel terminating at a combined sewage outfall dating to the late 1800s. Bubbly Creek is a 6800 ft (2000 m) creek termi- nating at the Racine Avenue pumping station (RAPS), the largest sewage pumping station in the world. During large storm events, the RAPS can discharge up to 6000 ft 3 /s (175 m 3 /s) into the creek. These high flow rates result in large shear flows on the sediment. The capping will be carried out in conjunction with overlaying wetlands to remove nutrients from the river and pollutants from combined sewage outflows. Active cap amendments will be evaluated in the one acre Collateral Channel site and the four acre Bubbly Creek site. Amendments will include metal sequestration agents and hydrophobic organic contaminant sequestration agents, as well as nitrate salts (to stimu- late anaerobic oxidation) and a sand reference cap. Extensive sampling of Collateral Channel and the Turning Basin of Bubbly Creek was performed to get a background dataset. Levels of toxic heavy metals, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls were compared to those at the same location from previous sampling events. In Collateral Channel, organic pollutant levels were high throughout core samples dating back to the 1800s. Contaminants were not significantly changed since 1995, suggesting natural attenuation is not occurring. Based on our results, we are focusing our active capping design in Collateral Channel on the very high levels of PAHs suggesting the importance of organic sequestration. In Bubbly Creek, the focus of the design is on combined treatment for metals, hydrophobic organics and high sulfide levels. Predicted gas ebullition rates of these sediments suggest the need for collection, particularly in the summer months in Collateral Channel. The wetland will overlay a sloped sand layer to bring biogenically-produced gas to shoreline collectors through an innovative support grid. The capping design is innovative by inclusion of an overlaying wetland to remove nutrients from the adjoining Chicago River and provide a public" @default.
- W2120943077 created "2016-06-24" @default.
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- W2120943077 date "2007-01-01" @default.
- W2120943077 modified "2023-09-27" @default.
- W2120943077 title "Combined Active Capping/Wetland Demonstration in the Chicago River" @default.
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