Mission Valley East Extension
Atkinson, in conjunction with Clark Construction Group, LLC, performed underground tunnel excavation for the Mission Valley East trolley extension at the San Diego State University campus. Crews used a number of excavation methods including cut and cover and New Austrian Tunneling Method (NATM) during the construction of the train tunnel and 50,000-square-foot station.
Atkinson utilized multiple crews and worked 24 hours a day, seven days a week to excavate the 37-foot-wide, 29-foot-high tunnel. Atkinson performed a total of 2,915 linear feet of cut and cover excavation and an additional 1,085 linear feet of NATM underground tunnel excavation.