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SYRUSA Engineering, Inc. is providing Assistant Structure Representative for the $1.3 Billion 91 Corridor in Corona, California. The project funded through Riverside County Transportation Commision (RCTC) and Federally Funded. The work consists of replacing and realignment of all the bridges from Magnolia Avenue overcrossing on the 15 FWY to Green River overcrossing. This project includes the I-15/SR-91 interchanges. The I-15 is being widen from south of the SR-91 Freeway. The SR-91 Freeway is being widen at the East Grand undercrossing, the Main Street undercrossing, West, Grand Avenue, Buena Vista Avenue, Lincoln Avenue, Maple Avenue, Auto Center/Surface Club on- and off-ramps. In addition, the project includes retaining walls type one and MSE walls, utility relocation, new utilities, roadways improvements, and multiple businesses realignments and improvements. SYRUSA is providing the Assistant Structure Representative (ASR) for the construction of the retaining walls and bridges. ASR is part of team that oversees the Independent Quality Assurance.