STFA Construction Co. Inc.
Passage Bridge (4514 m2)
Retaining Walls (Toplam 480 m)
Umraniye – Altunizade Motorway KISIKLI and TANTAVI Tunnels Application Projects
Preparation of pre-design and final design reports of L = 317,30 m. length TANTAVİ Tunnel and L = 689 m. length KISIKLI Tunnel, evaluation of soil investigation results, tunnel revetment calculations and projects, application projects of tunnel portals and bridges, preparation drainage and excavation quantities.