Owner: Los Angeles Harbor Department
Contract value: $47,257,000
This grade separation was an integral part of the Port of Los Angeles' $1 billion Pier 300/LAXT Expansion. It was also one of the first major projects on the Alameda Corridor, which takes all rail traffic from the Ports of Long Beach and Los Angeles to the main rail switch yard near downtown Los Angeles.
The project consisted of two double span steel railroad bridges with concrete substructures, six reinforced earth retaining walls, 200,000 cubic yards of embankment fill, 2 miles of various utilities (storm drain, waterline, telephone), a design-build train signaling system, 2 miles of new paved roadway and a storm water pump station. Most of the site was unstable due to the combination of a high ground water table and very weak soil characteristics. In order to alleviate this concern 2,300 3-ft diameter stone columns were installed 8 ft on center consolidating the weak soils and providing drainage to reduce the potential of soil liquefaction.
Truck and rail traffic, which could only be interrupted a few hours at a time, made the project difficult. After awarding the contract, the Owner requested that the project be completed six months early. This required numerous design changes, fast track scheduling, and many hours of overtime work. These changes not only reduced the time of construction, but they also reduced the total project cost for the Port of Los Angeles.