Installation of approximately 5 miles of large-diameter water supply pipeline within residential streets and major roadways

Utility trenches greater than 12-foot-deep in aeolian sand formations, intermittent sections of soft clay subgrades, intermittent sections of shallow groundwater 

Abrupt variability in subgrade 

Unstable and caving trench conditions

Challenging backfill conditions due to soft subgrade materials and groundwater 

Robust investigation and testing program to develop recommendations for variable economical backfilling solutions 

Expedient on-site assessments and mitigation recommendations for challenging shoring conditions and stabilizing areas of problematic subgrade conditions 

Expedited laboratory and field testing during construction