Monterey Pipeline - California American Water
Key Features
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Installation of approximately 5 miles of large-diameter water supply pipeline within residential streets and major roadways near coastline of California Central Coast
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Trenching in excess of 12 feet depth in aeolian sand formations, intermittent sections of plastic silt and clay subgrades, intermittent sections of shallow groundwater
Geotechnical Challenges
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Abrupt variability in subgrade materials over large distance
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Unstable and caving trench conditions
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Challenging backfill conditions due to soft subgrade materials and groundwater
Innovative Solutions
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Robust investigation and testing program to provide recommendations for variable subgrades and to provide economical backfilling solutions
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Expedient on-site assessments and recommendations for shoring means and methods, as well as expedited laboratory and field testing for backfills
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Thorough assessment and recommendations for backfilling and stabilization of areas of problematic subgrade conditions