• Designed with foamed glass aggregate as lightweight fill

over utility

• PennDOT required an 18-foot-high embankment over a

100-year-old brick sewer

• Philadelphia Water Department wanted no additional load

on historic sewer

• Contractor was able to install throughout December even

during snow storm

• A 3-foot cut of existing soil enabled an 18-foot-high

embankment of foamed glass aggregate without additional


• Embankment built to a 1:1 slope allowing access along

slope and eliminating the need for an MSE wall