{"id":null,"ids":[],"kind":"named in documents","name":"Yerba Buena Tunnel","tied_by":"name","block":null,"release":"v0.7.1","rows_columns":["t","id","year","y","date","kind","topic","outcome","summary","tier","source","leaf","scan","addr","quote","note","title","how","g","rec","sc"],"rows":[["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:66/3",2000,1959,"1959","event","study or report",null,"Yerba Buena Tunnel upper and lower decks · event: usage revised to mixed cars and trucks, requiring reconfiguration of upper deck support system","unverified","C124925065",66,"https://archive.org/details/C124925065/page/n65",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:66/4",2000,1959,"1959","event","study or report",null,"Yerba Buena Tunnel upper deck · event: reconstructed with prestressed floorbeam system spanning tunnel wall to tunnel wall","unverified","C124925065",66,"https://archive.org/details/C124925065/page/n65",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:66/5",2000,1959,"1959","finding","study or report",null,"Yerba Buena Tunnel deck · finding: live load code requirements unchanged since 1959 reconstruction","unverified","C124925065",66,"https://archive.org/details/C124925065/page/n65",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:66/6",2000,2000,"","finding","study or report",null,"Yerba Buena Tunnel lower level · finding: placing rail on lower level slab should not require alterations to its support system","unverified","C124925065",66,"https://archive.org/details/C124925065/page/n65",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:66/7",2000,2000,"","finding","study or report",null,"Yerba Buena Tunnel upper deck · finding: rail on upper deck would compromise the floorbeams as the load changes","unverified","C124925065",66,"https://archive.org/details/C124925065/page/n65",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:67/1",2000,2000,"2000","finding","study or report",null,"Yerba Buena Tunnel · other: 2,400 plf today to over 3,000 plf with three lanes and one track","unverified","C124925065",67,"https://archive.org/details/C124925065/page/n66",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:67/2",2000,2000,"2000","finding","study or report",null,"Yerba Buena Tunnel · finding: Reconstructing the tunnel is not a reasonable option","unverified","C124925065",67,"https://archive.org/details/C124925065/page/n66",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:67/3",2000,2000,"2000","recommendation","study or report",null,"Yerba Buena Tunnel · recommendation: create new rail tunnel bores so the existing tunnel remains undisturbed","unverified","C124925065",67,"https://archive.org/details/C124925065/page/n66",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0],["f","dl-sf-facts-v1.1-haiku55-2026-10/C124925065:88/1",2000,2000,"2000","building","study or report",null,"Yerba Buena Tunnel · other: 3D computer models of East and West spans and tunnel to be developed","unverified","C124925065",88,"https://archive.org/details/C124925065/page/n87",null,null,null,"Bay Bridge rail feasibility study","n","a",0,-1.0]]}