Bridges & Highways

The project includes 17-mile improvements to I-405 and road widening from SR-73 to I-605. The addition of one lane in both the northbound and southbound directions, as well as multi-jurisdictional services is expected to mitigate one of the busiest freeways in the US.

Group Delta, an NV5 Company, provided over a dozen asbestos and lead-based surveys and work plans of structures, bridges and over/under crossings for the I-405 improvements. Additional environmental services included Aerially Deposited Lead (ADL) Studies, soil and groundwater phase II investigations, NPDES dewatering groundwater investigations, due diligence, and Initial Site Assessment (ISA) for I-405, the largest transportation improvement project in Orange County history.

Group Delta Added Value:

• Environmental Hazard Assessments: Our team conducted over a dozen asbestos and lead-based paint surveys and work plans for structures, bridges, and over/under crossings, ensuring regulatory compliance and safe demolition practices.
• Comprehensive Environmental Services: Our team delivered Aerially Deposited Lead (ADL) studies, Phase II soil and groundwater investigations, and NPDES dewatering groundwater assessments to support environmentally responsible construction.
• Due Diligence Expertise: Our team provided thorough environmental due diligence and Initial Site Assessments across a complex, multi-jurisdictional corridor, helping to streamline approvals and mitigate project risk.