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FINAL REPORT: OTSEGO TOWNSHIP DAM AREA TIME CRITICAL REMOVAL ACTION, OPERABLE UNIT 5, AREA 3, ALLIED PAPER, INC./PORTAGE CREEK/KALAMAZOO RIVER SUPERFUND SITE
U.S. EPA Emergency Response Branch, 106 pp, 2019
A time-critical removal action (TCRA) was performed within a 1.7-mi river reach of the Kalamazoo Superfund site to remove PCB sediments, bank soils, and a temporary water control structure (WCS), and to stabilize the channel under the new dam-out condition. The banks were restored using bioengineering techniques and riparian restoration to increase the strength of the bank treatment and reduce maintenance over time. Pre-design investigation activities allowed for significantly reduced bank remediation and sediment volumes. Design and construction brought unique challenges to riverbank remediation and stabilization that required specific engineering/construction solutions such as in-stream structures, bioengineering techniques, and on-site reuse of materials. A pilot channel was dredged through unimpacted sediment to control development of the river thalweg (the line of fastest flow or deepest water along a river's course) as the WCS was lowered to facilitate construction of the new banks. The pilot channel directed the river flow to the center of the channel, preventing the potential for the channel to undermine the adjacent steep bank and cause slope failure. Dredge spoils were re-located via pumping to the downstream side of the former dam spillway where a scour hole had previously formed and would, in the future, be relatively cut off from the main river channel. Since implementation of the TCRA, the river has experienced several flood events and the constructed design functioned as planned. The bioengineered bank treatments will increase in strength and provide a robust bank treatment that requires minimal maintenance over time. See Otsego Township Dam section to download zip file that includes attachments, figures, and final report: https://cumulis.epa.gov/supercpad/SiteProfiles/index.cfm?fuseaction=second.Stayup&id=0502325 . Also see presentation by J. Caryl: https://www.michigan.gov/documents/egle/egle-tou-GLERRCpresentation-BankRemediationRestoration-Caryl-Wood_670760_7.pdf
A time-critical removal action (TCRA) was performed within a 1.7-mi river reach of the Kalamazoo Superfund site to remove PCB sediments, bank soils, and a temporary water control structure (WCS), and to stabilize the channel under the new dam-out condition. The banks were restored using bioengineering techniques and riparian restoration to increase the strength of the bank treatment and reduce maintenance over time. Pre-design investigation activities allowed for significantly reduced bank remediation and sediment volumes. Design and construction brought unique challenges to riverbank remediation and stabilization that required specific engineering/construction solutions such as in-stream structures, bioengineering techniques, and on-site reuse of materials. A pilot channel was dredged through unimpacted sediment to control development of the river thalweg (the line of fastest flow or deepest water along a river's course) as the WCS was lowered to facilitate construction of the new banks. The pilot channel directed the river flow to the center of the channel, preventing the potential for the channel to undermine the adjacent steep bank and cause slope failure. Dredge spoils were re-located via pumping to the downstream side of the former dam spillway where a scour hole had previously formed and would, in the future, be relatively cut off from the main river channel. Since implementation of the TCRA, the river has experienced several flood events and the constructed design functioned as planned. The bioengineered bank treatments will increase in strength and provide a robust bank treatment that requires minimal maintenance over time. See Otsego Township Dam section to download zip file that includes attachments, figures, and final report: https://cumulis.epa.gov/supercpad/SiteProfiles/index.cfm?fuseaction=seco
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