SBCTA has proposed to construct a 4.2-mile-long single bi-directional tunnel (24-foot bi-directional tunnel) directly connecting the Cucamonga Metrolink Station to ONT. Tunnel boring would occur up to 60 feet below the ground surface. The proposed tunnel alignment begins at the Cucamonga Metrolink Station adjacent to Milliken Avenue in the City of Rancho Cucamonga. Autonomous electric vehicles would enter the main artery tunnel via a ramp from the Cucamonga Station located within the existing Metrolink station parking lot. The tunnel alignment would continue south generally under Milliken Avenue. At Ontario Mills Parkway, the tunnel would shift east, to avoid the I-10 overcrossing structure, and hen shift back under Milliken Avenue, running southwest to clear the Ontario Municipal Utilities Company (OMUC) water tanks in the southeast quadrant of the I-10/Milliken Avenue interchange. The tunnel would begin curving west at Guasti Road to avoid the Union Pacific Railroad Company (UPRR) overcrossing bridge, connecting to Airport Drive east of Milliken Avenue. The proposed tunnel would then generally run under Airport Drive before terminating at ONT. At the airport, vehicles would emerge via ramps and drive to drop-off points near Terminal 2 or Terminal 4.
California Air Resources Board (ARB), California Department of Fish and Wildlife, Inland Deserts Region 6 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 8 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, California Native American Heritage Commission (NAHC)
State Reviewing Agency Comments
California Native American Heritage Commission (NAHC)
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