Group Delta worked on the State Route 22 Improvements project. Improvements were made for approximately 12 miles and extended through four cities. Work included 32 bridge structures, 83 retaining walls and sound walls, 51 ramps and 317 utility crossings.

Group Delta’s role involved developing 33 post advanced planning study geotechnical data reports for 33 bridges, providing construction support services including material testing and inspection, and moderating seismic accelerations and shallow groundwater

Location: Orange County, California
Client: Parsons