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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.