CASESTUDY SUBGRADE IMPROVEMENT S44 Soft and wet ground conditions encountered beneath the existing road. STEARNS COUNTY CSAH 115 ST. AUGUSTA, MINNESOTA Application: The Stearns County Department of Transportation relied on the Spectra ® Roadway Improvement System to treat a 2.5-mile-long section of weak subgrade. The Challenge: County State Aid Highway (CSAH) 115 had been repaved and patched repeatedly over a 20-year period. Each time the repair

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