Call : 1-800-480-4808

I-405 Sepulveda Pass

Carmageddon Returns To Los Angeles


I-405 Sepulveda Pass
Location: Los Angeles, CA
Office: Rancho Cucamonga
Service: Materials Testing
Client: Kiewit Pacific
Construction Cost:
RMA Scope of Work:
The I-405 Sepulveda Pass Widening Project consisted of adding a 10-mile HOV lane on the northbound I-405 between the I-10 and US 101. The corridor is the most heavily travelled corridor in the United States and the addition of the new lanes intend to reduce existing and projected traffic congestion through the Sepulveda Pass.

This project was highly complex and challenging to construct. It included the construction of new freeway lanes, 27 on- and off- ramps, the widening of 13 existing underpasses and bridge structures, and construction of approximately 18 miles of MSE retaining walls, soil-nail walls, conventional reinforced-concrete retaining walls, and masonry-sound walls.

In addition, the project required the removal and complete reconstruction of bridges at Skirball Center Drive, Sunset Boulevard, and Mulholland Drive. The 72-hour closures required to complete these removals were affectionately named “Carmaggedon” by the local media. During these closures, RMA Group provided three separate shifts of inspectors and technicians to continuously staff the project.

The entire project was constructed with extensive night work to facilitate the delivery of materials to the project while minimizing the impacts on the public. RMA Group provided around-the-clock dispatch and professional support to manage and resolve issues in real time as they arose. Our staff of engineers reviewed the results of all tests performed for each shift and issued materials test reports and inspection reports on a daily basis with a 24-hour turn around. The project is one of 10 pilot projects approved by the California State Legislature to be delivered by the “Design Build” method. This method of delivery requires an independent third-party laboratory to provide all aspects of Quality Assurance testing and inspection for both source inspection and onsite construction. In order to meet these requirements, RMA Group assembled a team of highly specialized inspectors to provide the full range of inspection and testing capabilities normally provided by the California Department of Transportation. This included testing of Elastomeric Bearing Pads, inspection of pre-cast concrete plants and structural steel shops located throughout the western United States, Gamma Gamma and Cross Hole Sonic logging of pile foundations, skid and friction testing of completed pavements, corrosion and geotechnical testing of MSE wall backfill, NACE inspection of coatings, and all of the conventional roadway materials testing and structural inspections for concrete, aggregates, soils, asphalt concrete pavements, structural steel, reinforcing steel, steel couplers, and hoops.

The project was constructed with oversight by the Los Angeles County Metropolitan Transportation Authority, the California Department of Transportation, and the City of Los Angeles, each of which employs stringent and varying construction specifications. RMA Group provided a Caltrans certified laboratory onsite with a staff of over 35 personnel to accomplish the required testing and inspection in accordance with the various requirements of project stakeholders. Our inspectors and technicians worked seamlessly providing testing per ASTM, AASHTO, and CALTRANS test methods where appropriate.

The experience gained through our work on the I-405 Sepulveda Pass project required the development of processes and staffing that now enable us to competently complete any project regardless of scale, providing professional, experienced staff and accurate, timely reporting and tracking of test results and inspection reports.