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• Reconstruction of JFK Boulevard at 22nd Street

in Philadelphia

• Existing 24 foot high cast-in-place 40-year-old retaining

wall starting to show signs of movement

• Solution was to excavate existing soils behind retaining

wall and replace with foamed glass aggregate

• UL-FGA reduced the lateral load to mitigate concerns

regarding further movement

• Design concerns included nearby buildings sensitive to

construction or permanent disruptions