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Ultra-lightweight fill used to backfill arch during construction of roadway above, area under arch on soft soil and in floodplain of adjacent Schuylkill River, FGA eliminated the need for foundation support under fill, FGA fill replaced steel support structure while preserving the historic look of bridge, vertical face constructed with high strength woven geotextile reinforcement as part of a Mechanically Stabilized Earth (MSE) structure, flowable fill used to fill the rise of the arch from the top of FGA layer. Foamed glass was placed using a high speed conveyor belt due to limited access.

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