Bus Lot Surface Stabilization

Due to severe deterioration of the bituminous paving resulting from settlement of underlying poor soils at their bus lot, Haverford Township School District contracted G&A to conduct a geotechnical investigation including test borings that confirmed the presence of debris fill containing glass and wood, to depths over 20 feet.

Because of the enormous expense associated with a soil exchange, G&A evaluated subgrade stabilization solutions that would provide stable support of new pavement while minimizing excavation depth.  G&A proposed a surface stabilization requiring only 6 inches of subgrade over excavation.  A 12-inch thick layer of compacted PADOT 2A coarse aggregate, reinforced with two types of high-performance Tensar geogrid, including their new InterAx material was used.

G&A provided construction plans and specifications and assisted the District with bidding, construction management, and construction observation. The project was completed under budget.



Haverford Township School District

Havertown, PA

Market Segment



Trevor Woodward, P.G.
Geotechnical Services Manager

Andrew Schanck, P.E.
Project Manager