Group Delta personnel have performed design-level geotechnical investigations and construction-phase services during major redevelopment and expansion of most local southern California airports including Los Angeles World Airport (LAX) in Los Angeles; John Wayne Airport in Orange County; Long Beach Airport; These projects included concrete taxiways, runways, terminal aprons, multi-storied parking structures, elevated and depressed roadways, arterial street and freeway improvements, pavement repair, and retaining walls.