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Highways & Bridges

Group Delta Consultants has extensive experience providing geotechnical recommendations throughout Southern California on major highway and bridge projects. We are experienced with Caltrans’ requirements and procedures including District review, responding to review comments, and Final Approval. We have performed similar work for other local agencies including Orange County Transportation Authority (OCTA), Metro, SANBAG, Transit Corridor Authority (TCA), Riverside County Transportation Commission (RCTC), Metropolitan Transit Development Board (MTDB) and others.

Associate Geotechnical Engineer Curt Scheyhing, G.E. has completed geotechnical investigations for hundreds of bridges and highways throughout Southern California. If you would like to discuss your highway or bridge project, you can contact Curt at (949) 450-2100.

Take a look at some of the highway/bridges projects we've worked on below or you can also download our statement of qualifications (SOQ) to provide geotechnical services to the transportation market sector in our SOQs Downloads section.

State Route 91 Corridor Improvements

SR-91 I-15 Interchange


The State Route 91 (SR-91) Corridor Improvement Project is focused on the existing 14-miles of congestion on SR-91 and a 6-mile boundary that runs from the SR-241 Toll Road in Yorba Linda to Pierce Street in Riverside. Additional project areas include the I-15 between Cajalco Road and Hidden Valley Parkway in Norco. The proposed improvements will ease movement of people and goods between Riverside County and Orange County.

Group Delta performed laboratory testing on samples recovered from the borings and developed Post Advanced Planning Study Geotechnical Data Reports for bridges along the alignment. These reports included compilation of existing and new boring and laboratory data, foundation conditions, assessment of liquefaction potential and discussion of various foundation types.

Group Delta's responsibilities also included review of the design build contractor's submittals, and QA/QC testing during the construction. All work was performed under a formal QA/QC program in accordance with the ISO 9000.

I-210 Gold Line "Iconic" Bridge

I-210 Iconic Bridge

The Foothill Extension Phase 2A is the 11.5 mile extension of the Metro Gold line from Pasadena to Azusa. An important component of the Phase 2A is the 584 foot long light rail transit (LRT) bridge over the I-210 in the City of Arcadia. This bridge is the Gold Line Foothills Extension's First Design/Build project. The light rail bridge was designed by world-renowned artist Andrew Leicester. Adding to the challenge of the unique artistic design was the need to create a long span crossing an active seismic fault (Raymond Fault). To address these issues, AECOM designed a three-span, cast-in-place post-tensioned box girder supported by a single column bent and one outrigger bent spanning the freeway. Because of the large vertical and lateral demands of the structure, AECOM designed three large-diameter cast-in-drilled-hole (CIDH) foundations—each approximately 110 feet deep and 11 feet in diameter.

Group Delta provided geotechnical engineering recommendations to the design-build team of Skanska USA/AECOM including three levels of seismic design (ODE, MDE, and CALTRANS (ARS), foundation recommendations for the large diameter CIDH Piles, and we provided design support during construction.

State Route 330 Emergency Repairs

SR-330 Emergency Repairs

State Route 330 (SR-330) was damaged by washouts and slides during a severe winter storm in late December 2010. The route, one of the major arteries to the San Bernardino Mountain communities, was fully closed due to the damage. In January 2011, Caltrans awarded the first of three emergency contracts to repair SR-330. The scope of emergency repair work consisted of implementing new drainage uphill, installing debris racks, constructing buttresses, reconstructing slope and road, placing metal beam guardrails, and repairing damaged culverts.

The contractor (Skanska) utilized an aggressive staging schedule consisting of 24-hour, continuous shifts to expedite work. Group Delta provided construction materials testing in the field and mobilized an on-site lab for continuous shift testing. Our services included sampling and testing of soil, concrete, asphalt, and related materials during placement. SR-330 was permanently reopened in June 2011, approximately four months ahead of schedule.

State Route 22 Widening

SR 22 Widening

The Orange County Transportation Authority (OCTA) and Caltrans constructed improvements to the Garden Grove Freeway (SR-22) in Orange County. These improvements include the widening of the freeway and the construction of HOV lanes.  This project was the first Design-Build project on an active Caltrans right-of-way. Group Delta provided geotechnical engineering services for the Program Management Team of the Design-Build RFP.

Project Highlights:

  • 33 Bridge Preliminary Foundation Reports

  • More than 10 miles of walls

  • Oversight of Design Build Contractor submittals

  • Performed Quality Assurance Testing during construction

The Garden Grove Freeway (SR-22) HOV Lane Design Build Project was selected as the 'Project of the Year' by the Orange County Section of the American Society of Civil Engineers (ASCE).


Tustin Ranch Road Extension

Tustin Ranch Road Extension

The Tustin Ranch Road Extension project in Orange County originates at Walnut Avenue on the north and trends southerly to its intersection with Warner Avenue. This project extends 1.5 miles and is expected to improve local traffic conditions immensely. The roadway includes a new bridge crossing the Metrolink and Edinger Avenue.

Group Delta is providing QA Materials Testing and Inspection Services to the Parsons CM Team for this project. Our services have included sampling and testing of infrastructure PCC improvements and major bridge components. We are providing source inspection and sampling at fabrication shops in both Northern and Southern California. We have provided laboratory testing services of materials used on this project from all three of our Southern California Laboratories.

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