Tutor Perini Corp. reports that Caltrans has informed the firm that it has been awarded a $215-million contract for construction of the fourth bore tunnel at the Caldecott Tunnel section of Highway 24 in Alameda and Contra Costa counties near Oakland. Photo: Caltrans Caltrans awarded the contract to Tutor-Saliba Corp., a wholly-owned subsidiary of Tutor Perini Corp. The tunnel will be approximately 990 meters long and will add two additional lanes of traffic in the westbound direction and is designed to alleviate traffic congestion along the Route 24 corridor. Construction is anticipated to start in January and will take approximately