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Geopier Foundation Co. says it developed Rammed Aggregate Pier® (RAP) Systems as efficient and cost effective solutions for reinforcement of soft, compressible soils. RAP Systems are used for support of railroad embankments, retaining walls, slope stabilization and track subgrade support. The RAP Systems are a cost-effective replacement for massive overexcavation and replacement or deep foundations, the company says. Thousands of structures are currently supported by RAP Systems — proven experience that ensures high levels of performance and reliability compared to traditional systems, the company says.