Owner
Southern California Regional Rail Authority (SCRRA)
Completion Date
February 2010
DYA Client
AECOM
Project Description
Diaz•Yourman & Associates (DYA) provided the geotechnical input for the design of this proposed project, which consists of two grade-separation structures (Empire Avenue and Buena Vista Street) and retaining walls to relocate the existing Metrolink service west of its current location to accommodate the proposed widening of I-5 by Caltrans. The embankment will be approximately 25 feet high. The current San Fernando Road undercrossing will be filled and abandoned. A temporary structure will be built at the San Fernando Road intersection with the SCRRA railroad tracks to accommodate a temporary railroad shoofly track during construction of the project. DYA performed an excavation of approximately 25 feet of Empire Avenue for the proposed extension under I-5. The proposed structures will be located in the SCRRA right-of-way on the west side of I-5 between Burbank Boulevard and California Street.
The scope of our services consisted of the following tasks:
- Reviewing data
- Conducting a supplemental field investigation
- Performing engineering analyses to develop conclusions and recommendations regarding the following:
- American Railroad Engineering Maintenance-of-Way Association seismic design criteria
- Site preparation and grading
- Foundation type and allowable bearing capacity
- Estimated total and differential foundation settlements
- Retaining wall type
- Resistance to lateral loads
- Vertical and lateral earth pressures
- Corrosion potential
- Preparing a written report
Gary K. Gilbert, PE, GE – Geotechnical Project Manager
Allen M. Yourman, Jr., PE, GE – Geotechnical Principal/QC Reviewer