The Orange County Transit Authority entails OCTA will reconstruct Orangethorpe Avenue as a bridge to allow vehicles to pass over the Burlington Northern Santa Fe (BNSF) Railway tracks to separate rail and roadway traffic. On the west side of the project, Crowther Avenue and Miller Street will rise to meet Orangethorpe Avenue, which begins to ascend approximately 500 feet west of Miller Street. On the north side of the project, Chapman Avenue rises to meet the elevated portions of Orangethorpe, which lowers back to street level approximately 800 feet east of Chapman.
The project entails elevating a four-lane city street above the BNSF railroad by placing 300,000 cubic yards of fill and building multiple retaining walls. The project is expected to greatly improve traffic conditions for commuters.
MORGNER is a sub-consultant to Flatiron on this contract. MORGNER was charged with performing Pre-Construction surveys on all properties within 100’ of excavation, jack and bore, and micro TBM activities. MORGNER assisted in the development of a vibration monitoring plan and implemented the remote and continuous monitoring of vibration levels throughout the alignment of the project at some point operating and maintaining 5 vibration monitors simultaneously.