Mr. Tamannaie designed two LRT viaducts at Dominguez Junction and Slauson Avenue for the transit system as alternatives to precast
designs on an exceptionally fast schedule before the bid. In addition, the designs of the multispan station structure, piggybacking on
the mainline viaduct at Slauson Avenue, and a maintenance flagging structure were provided. The cast-in-place designs incorporated
state-of-the-art structural configurations with split superstructure for lightness, outrigger bents that accommodated congested exiting settings
on the ground, deep pile shafts and challenging seismic conditions in southern Los Angeles County. Additionally, the design accommodated
complex power duct banks and other utility systems inside the super- and substructure. The successfully completed design was incorporated in
the bid alongside the precast options designed by others and was the winner of the bid for construction.