Monterey Pipeline - California American Water


Key Features 


  • Installation of approximately 5 miles of large-diameter water supply pipeline within residential streets and major roadways near coastline of California Central Coast

  • 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 


  • Abrupt variability in subgrade materials over large distance

  • Unstable and caving trench conditions

  • Challenging backfill conditions due to soft subgrade materials and groundwater 


Innovative Solutions


  • Robust investigation and testing program to provide recommendations for variable subgrades and to provide economical backfilling solutions 

  • Expedient on-site assessments and recommendations for shoring means and methods, as well as expedited laboratory and field testing for backfills

  • Thorough assessment and recommendations for backfilling and stabilization of areas of problematic subgrade conditions