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

Abrupt variability in subgrade materials over large distance

Unstable and caving trench conditions

Challenging backfill conditions due to soft subgrade materials and groundwater 

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