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ALL ALONG THE WATERFRONT - CASE STUDY UTILIZING VARIOUS REMEDIAL STRATEGIES FOR A LARGE BROWNFIELD SITE IN YONKERS, NY
Godick, M. and P. McHugh. | National Ground Water Association Groundwater Week, 3-5 December, Las Vegas, NV, 27 slides, 2019

A combined groundwater remediation remedy was used on the 10-acre Polychrome R&D Lab Site along the Hudson River waterfront in Yonkers, NY. The site had multiple sources of historical contamination, including coal tar from an offsite manufactured gas plant. A six-year assessment that included traditional assessment techniques, as well as TarGOST laser-induced fluorescence technology, was conducted to delineate the vertical and horizontal extent of coal tar contamination. The remedy required a complex combination of remedial solutions including in situ soil solidification (ISS), auger column ISS, slurry wall, injection of rigid foam along preferential utility pathways, source removal by excavation and NAPL recovery, bioremediation, sub-slab depressurization system, and site capping. Remedial efforts were complicated by a variety of factors including an elevated, tidal water table in the floodplain; multiple geologic units; coal tar contamination at depth; poor soil quality/strength due to historical fill; deteriorated and aged municipal utilities and adjacent structures; nearby sensitive receptors including an adjacent food manufacturing facility; significant regulatory oversight; and redevelopment plans requiring construction in areas of residual contamination. The presentation focused on the effect of remediation on groundwater quality, comparing pre- and post-remediation results in addition to discussing regulatory implications of baseline emerging contaminant sampling post-remediation. To download the presentation: https://ngwa.confex.com/ngwa/gw19/meetingapp.cgi/Paper/12824 See the Final Engineering Report for more information



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