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First Quarter 2009 Project Progress and Financial UpdateToll Bridge Seismic Retrofit andRegional Measure 1 ProgramsFirst Quarter 2009Project Progress and Financial Update3Released: May 2009
TOLL BRIDGE SEISMIC RETROFIT ANDREGIONAL MEASURE 1 PROGRAMSFirst Quarter 2009Project Progressand Financial Update
Table of ContentsIntroduction . . 1Summary of Major Project Highlights, Issues, and Actions . 2Toll Bridge Seismic Retrofit Program Cost Summary . 6Toll Bridge Seismic Retrofit Program Schedule Summary . 7Regional Measure 1 Program Cost Summary . . 8Regional Measure 1 Program Schedule Summary . 9Toll Bridge Seismic Retrofit Program . 12San Francisco-Oakland Bay Bridge Seismic Retrofit Strategy. 12San Francisco-Oakland Bay Bridge East Span Replacement Project Summary. 15Yerba Buena Island Detour (YBID) . 16YBID East Tie-in Opening Activities . 18Yerba Buena Island Transition Structures (YBITS) . 20Self-Anchored Suspension (SAS) Bridge . 22SAS Construction Sequence . 24SAS Superstructure Fabrication Activities . 26SAS Superstructure Field Activities . 29Skyway . 32Oakland Touchdown (OTD) . 34Other Contracts. 36Quarterly Environmental Compliance Highlights . 38San Francisco-Oakland Bay Bridge West Approach Replacement Project . 39Other Completed Projects . 40Risk Management . 42TBSRP Program Funding Status . 48Financing Program . 47Program Funding Status . 49CTC TBSRP Contributions. 49Summary of TBPOC Expenses . 49Seismic Retrofit of Dumbarton and Antioch Bridges . 52Dumbarton Bridge Seismic Retrofit Project . 52Antioch Bridge Seismic Retrofit Project . 54Project Cost and Schedule Summaries . 56Regional Measure 1 Toll Bridge Program . 60New Benicia-Martinez Bridge Project . 60Interstate 880/State Route 92 Interchange Reconstruction Project . 62Other Completed Projects . 64Appendices . 67
Toll Bridge Program Oversight CommitteeMap of Bay Area Toll Bridges** The Golden Gate Bridge is owned and operated by the Golden Gate Bridge, Highway, and Transportation District.
IntroductionIn July 2005, Assembly Bill (AB) 144 (Hancock) created the Toll Bridge Program Oversight Committee (TBPOC) to implement aproject oversight and project control process for the Benicia-Martinez Bridge project and the State Toll Bridge Seismic RetrofitProgram projects. The TBPOC consists of the Caltrans Director, the Bay Area Toll Authority (BATA) Executive Director and theExecutive Director of the California Transportation Commission (CTC). The TBPOC’s project oversight and control processesinclude, but are not limited to, reviewing bid specifications and documents, providing field staff to review ongoing costs,reviewing and approving significant change orders and claims in excess of 1 million (as defined by the committee) andpreparing project reports.AB 144 identified the Toll Bridge Seismic Retrofit Program and the new Benicia-Martinez Bridge Project as being under thedirect oversight of the TBPOC. The Toll Bridge Seismic Retrofit Program includes:Toll Bridge Seismic Retrofit ProjectsSan Francisco-Oakland Bay Bridge East Span ReplacementSeismic Safety StatusConstructionSan Francisco-Oakland Bay Bridge West Approach ReplacementCompleteSan Francisco-Oakland Bay Bridge West Span Seismic RetrofitCompleteSan Mateo-Hayward Bridge Seismic RetrofitCompleteRichmond-San Rafael Bridge Seismic RetrofitComplete1958 Carquinez Bridge Seismic RetrofitComplete1962 Benicia-Martinez Bridge Seismic RetrofitCompleteSan Diego-Coronado Bridge Seismic RetrofitCompleteVincent Thomas Bridge Seismic RetrofitCompleteThe new Benicia-Martinez Bridge is part of a larger program of toll-funded projects called the Regional Measure 1 (RM1) TollBridge Program under the responsibility of BATA and Caltrans. While the rest of the projects in the RM1 program are notdirectly under the responsibility of the TBPOC, BATA and Caltrans will continue to report on their progress as an informationalitem. The RM1 program includes:Regional Measure 1 ProjectsOpen to Traffic StatusInterstate 880/State Route 92 Interchange ReconstructionConstruction1962 Benicia-Martinez Bridge ReconstructionConstructionNew Benicia-Martinez BridgeOpenRichmond-San Rafael Bridge Deck Overlay RehabilitationOpenRichmond-San Rafael Bridge Trestle, Fender & Deck Joint RehabilitationOpenWestbound Carquinez Bridge ReplacementOpenSan Mateo-Hayward Bridge WideningOpenState Route 84 Bayfront Expressway WideningOpenRichmond ParkwayOpenThis report focuses on identifying critical project issues and monitoring project cost and schedule performance for the projectsas measured against approved budgets and schedule milestones. This report is intended to fulfill Caltrans' requirement toprovide monthly project progress reporting to the TBPOC under Section 30952.05 of the Streets and Highway Code.1
Toll Bridge Program Oversight CommitteeSUMMARY OF MAJOR PROJECT HIGHLIGHTS, ISSUES, AND ACTIONSToll Bridge Seismic Retrofit ProgramRisk ManagementSAS Roadway Boxes in FabricationShear-Leg Crane Barge Arrived in San Francisco Bay onMarch 12, 2009A major element of Assembly Bill 144 of 2005, the lawcreating the TBPOC, was legislative direction toimplement a more aggressive risk management program.Such a program has been implemented in stages overtime to ensure development of a robust andcomprehensive approach to risk management. We havereached a milestone with our risk management programwith all elements now fully incorporated, resulting in oneof the most detailed and comprehensive riskmanagement programs in the country today. From thispoint forward, we will adopt a “50 percent probability”standard when assessing and reporting risks, whichresults in major cost forecast revisions for the SelfAnchored Suspension Span (SAS) Superstructure andYerba Buena Island Detour (YBID) contracts and forprogrammatic risks. Our forecasts are based on anassessment of risks that are 50 percent probable to berealized. It is possible our forecasts could decrease asrisks are resolved and retired. Nonetheless, we want toensure that the public is fully informed of the risks wehave identified and the possible expense they couldnecessitate. It is important to note that, even if all theserisks were to be realized, there still would be 129.3million remaining in the contingency reserve.The risk management program is described in moredetail on pages 42 through 46 of this report.San Francisco-Oakland Bay Bridge(SFOBB) East Span SeismicReplacement ProjectSAS Superstructure ContractThe contractor for the Self-Anchored Suspension (SAS)Bridge, American Bridge/Fluor, continues work on boththe fabrication of major bridge components around theworld and on the temporary support structures in the bay.The contractor has reported that fabrication of the steeltower and roadway boxes has fallen behind schedule dueto the shop preparation process and the complexity of thefabrication. This delay is putting pressure on thewestbound opening of the bridge in 2012, but has not yetaffected the expected full opening date of the bridge in2013. The TBPOC and the contractor continue to2
First Quarter 2009 Project Progress and Financial Updatenegotiate a mitigation proposal. The cost for thisagreement is included in the revised forecast for theproject. The TBPOC and contactor continue to evaluate alloptions to accelerate the project. Caltrans is alsocontinuing their quality assurance process so that no partof the new bridge will be shipped unless it is fit to beinstalled.Temporary Support Structures for the SAS Bridge ErectionOut on the bay, the contractor continues to erect thetemporary support structures that span from Yerba BuenaIsland to the Skyway. These structures will support theSAS bridge before the cable system is installed. With thearrival of the shear-leg crane barge from China on March12, 2009, the longer and heavier segments of thetemporary support structures can be lifted into place.To further mitigate future project risks, Caltrans hasestablished risk management teams to evaluate futurepotential risks to completing the project on time and onbudget. In particular, teams are reviewing cable erectionplans and mitigation schedules. Based on the last riskmanagement assessment, there is a potential for a 227.4million increase on the contract.Yerba Buena Island Detour ContractYerba Buena Island Detour Structure Under ConstructionThe Yerba Buena Island Detour contractor, CC Myers,continues to erect the detour structure that will divert trafficoff the existing bridge to the detour structure that will tiethe existing bridge to the Yerba Buena Island tunnel. Thetraffic switch has been scheduled for Labor Day Weekend2009 and will require a full closure of the Bay Bridge overan extended holiday weekend. In addition to work on thedetour structure, the contractor is making progress on anumber of accelerated foundations for the future transitionstructure from the SAS to the tunnel.Based on the last risk management assessment, there ispotential for a 84.5 million increase for the contract. Risksinclude the cost to potentially postpone Labor Dayweekend 2009 operations due to unexpected high windsand unexpected construction challenges during thedemolition of the old structure. These risks are beingaddressed via collaborative on-site meetings betweenCaltrans and the contractor to actively identify and resolveissues early and at the least cost.3
Toll Bridge Program Oversight CommitteeSUMMARY OF MAJOR PROJECT HIGHLIGHTS, ISSUES, AND ACTIONSTBSRP Capital Outlay SupportBased on initial discussions with our contractors, earlycompletion of the East Span Project was believed to behighly possible and sufficient to mitigate potential identifiedsupport cost increases. The support cost increases are dueprimarily to the need to re-advertise the SAS contract and bydecisions made to increase our opportunities for earlycompletion of the East Span project and potential for supportcost savings. These decisions include a 12-month scheduleextension provided during bid time to attract the maximumnumber of bidders for the SAS contract and extension of theYBI Detour contract to advance future foundation andcolumn work of the transition structure and west end deckreconstruction. Since we now judge early completion and theattendant cost savings to be less likely, we forecast apotential drawdown of 214.5 million from the programcontingency for project support. Further increases in projectsupport costs would be expected if the project is delayedbeyond the 2013 bridge opening date.TBSRP Programmatic RisksThis category includes risks that are not yet scoped withinexisting contracts and/or spread across multiple contracts.The interdependencies between all the contracts in theprogram result in the potential for delays on one contract toimpact the other contracts in the overall program ofcontracts. We forecast a net potential drawdown of 117.2million from the program contingency for these risks.SFOBB West Approach SeismicReplacement ProjectCaltrans certified seismic safety on the San FranciscoOakland Bay Bridge West Approach Seismic ReplacementProject in December 2008 - eight months ahead of schedule.On February 9, 2009, Caltrans reopened the Harrison Streetwestbound off-ramp from the Bay Bridge, which was closedfor over three years for construction. The contract wassubstantially completed in February 2009 with only finalcloseout and punchlist work remaining.Recently Reopened Harrison Street Off-Ramp4
First Quarter 2009 Project Progress and Financial UpdateSeismic Retrofit of the Dumbarton andAntioch BridgesAntioch BridgeWhen first conceived, the Toll Bridge Seismic RetrofitProgram only identified seven of the nine state-owned tollbridges to be in need of seismic retrofit, excluding theDumbarton and Antioch bridges. Further seismicvulnerability studies were completed by Caltrans and BATAon those structures, which determined that both structureswere in need of retrofit based on current seismicstandards. While final designs for the retrofit of the bridgesare still being prepared, the total cost to retrofit bothstructures is estimated to be 950 million. StateAssemblyman Tom Torlakson is sponsoring Bill AB1175 toamend the Toll Bridge Seismic Retrofit Program to includethe Antioch and Dumbarton bridges and to make theprojects eligible for TBSRP funding.New Benicia-Martinez Bridge ProjectOn the 1962 Benicia-Martinez Bridge Modification Contract,work to modify the southbound I-680 bridge to add anadditional traffic lane and bicycle/pedestrian lane isproceeding. Caltrans is forecasting the work to becompleted at least two months ahead of schedule inOctober 2009.New Bicycle/Pedestrian Pathway on Benicia Martinez BridgeInterstate 880/State Route 92Interchange Reconstruction ProjectOn the Interchange Reconstruction Contract, the new eastRoute 92 to North Interstate 880 direct connector structure(ENCONN) is nearing completion and is scheduled to opento detour traffic in mid-May.New East Route 92 to North Interstate 880 Direct ConnectorUnder Construction5
Toll Bridge Program Oversight CommitteeToll Bridge Seismic Retrofit Program Cost SummaryContractStatusAB 144/SB 66Budget(Jul t(Mar 2009)Cost to Date(Mar 2009)Current CostForecast(Mar 2009)Cost Varianceabc a bdef e-cCost StatusSFOBB East Span Seismic ReplacementCapital Outlay 36.81,254.1- SAS Marine FoundationsCompleted313.5(32.6)280.9275.0280.9- SAS 1.1227.4 YBI DetourConstruction132.0310.2442.2300.7526.784.5 299.3(23.2)276.1-278.01.9 YBI Transition Structures (YBITS)YBITS 1Advertised-215.3 YBITS 2Design-59.4 YBITS LandscapingDesign-3.3 161.2290.6153.3214.6 Oakland Touchdown283.8-283.86.8OTD 1ConstructionOTD 2Design-62.0 OTD Electrical SystemsDesign-4.4 Submerged Electric CableCompleted7.99.6 239.2-239.2-222.0(17.2) Completed15.03.318.316.718.3- Completed90.3-90.389.290.3- 959.3-959.3703.91,173.8214.5 Right-of-Way and Environmental Mitigation72.4-72.451.172.4- Other Budgeted Capital35.1(3.3)31.80.77.7(24.1) 5486.6215.55,702.13,512.96,195.9493.8Existing Bridge DemolitionDesignStormwater Treatment MeasuresOther Completed ContractsCapital Outlay SupportTotal SFOBB East Span ReplacementSFOBB West Approach ReplacementCapital Outlay Construction 309.041.7350.7318.6350.7- Capital Outlay Support120.0-120.0114.8120.0- Total SFOBB West Approach ,741.91,713.21,741.9- 30.0-30.024.730.0- ----117.2117.2 900.0(159.7)740.3-129.3(611.0) 8,685.0-8,685.05,684.28,685.0- Completed Program ProjectsMiscellaneous Program CostsNet Programmatic RisksProgram ContingencyTotal Toll Bridge Seismic Retrofit Program 6 CompletedCompletedWithin approved schedule and budgetIdentified potential project risks that could significantly impact approved schedules and budgets if not mitigatedKnown project impacts with forthcoming changes to approved schedules and budgets
First Quarter 2009 Project Progress and Financial UpdateToll Bridge Seismic Retrofit Program Schedule SummaryAB144/SB 66ProjectCompletionScheduleBaseline(Jul 2005)TBPOCApprovedChanges(Months)Current TBPOCApprovedCompletionSchedule(Mar 2009)CurrentCompletionForecast(Mar 2009)ScheduleVariance(Months)Schedule StatusRemarks/Notesghi g hjk j-ilSkywayApr 20078Dec 2007Dec 2007- See Page 32SAS Marine FoundationsJun 2008(5)Jan 2008Jan 2008- See Page 22SAS SuperstructureMar 201212Mar 2013Mar 2013- See Page 23YBI DetourJul 200735Jun 2010Nov 20105 See Page 16YBI Transition Structures (YBITS)Nov 201312Nov 2014Nov 2014-YBITS 1Sep 2013Sep 2013- YBITS 2Nov 2014Nov 2014- TBDTBD- Nov 2014Nov 2014-OTD 1May 2010May 2010- OTD 2Nov 2014Nov 2014- TBDTBD- Jan 2008Jan 2008- SFOBB East Span Seismic ReplacementContract CompletionYBITS LandscapingOakland TouchdownNov 201312OTD Electrical SystemsSubmerged Electric CableSee Page 20See Page 34Existing Bridge DemolitionSep 201412Sep 2015Sep 2015- Stormwater Treatment MeasuresMar 2008-Mar 2008Mar 2008- OTD West bound AccessJan 2010Jan 2010- YBI Detour OpenSep 2009Sep 2009- See page 18See page 2SFOBB East Span Bridge Opening and Other MilestonesWest bound OpenSep 201112Sep 2012Dec 20123 East bound OpenSep 201212Sep 2013Sep 2013- SFOBB West Approach ReplacementContract Completion Aug 2009(7)Jan 2009Jan 2009- See page 39Notes: 1) Figures may not sum up to totals due to rounding effects.2) TBSRP Forecasts for the Monthly Reports are generally updated on a quarterly basis in conjunction with quarterly risk analysis assessments for the TBSRP Projects.7
Toll Bridge Program Oversight CommitteeRegional Measure 1 Program Cost SummaryContractStatusBATABaselineBudget(Jul 2005)BATAApprovedChangesCurrent BATAApprovedBudget(Mar 2009)Cost to Date(Mar 2009)Current CostForecast(Mar 2009)Cost Varianceabc a bdef e-cCost StatusNew Benicia-Martinez BridgeCapital Outlay 5.1- 157.135.2192.3186.8192.3- Capital Outlay Right-of-Way20.4(0.1)20.317.020.3- Project ,272.594.860.2155.058.0155.0- 28.826.255.046.155.0- Capital Outlay Right-of-Way9.97.016.911.616.9- Project Reserve0.317.818.1-18.1Total I-880/SR-92 Interchange Reconstruction133.8111.2245.0115.7245.0Completed Program 36.42,181.62,416.4(20.0)Capital Outlay SupportTotal New Benicia-Martinez BridgeInterstate 880/Route 92 Interchange ReconstructionCapital Outlay ConstructionCapital Outlay SupportTotal Regional Measure 1 Toll Bridge Program 8ConstructionWithin approved schedule and budgetIdentified potential project risks that could significantly impact approved schedules and budgets if not mitigatedKnown project impacts with forthcoming changes to approved schedules and budgets
First Quarter 2009 Project Progress and Financial UpdateRegional Measure 1 Program Schedule SummaryBATA BaselineCompletionSchedule(Jul 2005)BATA ApprovedChanges(Months)Current BATAApprovedCompletionSchedule(Mar 2009)CurrentCompletionForecast(Mar 2009)ScheduleVariance(Months)Schedule Statusghi g hjk j-ilDec 2009-Dec 2009Oct 2009(2) Dec 2007(4)Aug 2007Aug 2007- Dec 20106Jun 2011Jun 2011- Remarks/NotesNew Benicia-Martinez BridgeContract Completion1962 BM Bridge ReconstructionSee Page 58New Benicia-Martinez Bridge Opening DateNew BridgeInterstate 880/Route 92 Interchange ReconstructionContract CompletionInterchange ReconstructionSee Page 60Notes: 1) Figures may not sum to totals due to rounding effects.9
TOLL BRIDGE SEISMIC RETROFIT PROGRAM
Toll Bridge Program Oversight CommitteeTOLL BRIDGE SEISMIC RETROFIT PROGRAMSan Francisco-Oakland Bay Bridge Seismic Retrofit StrategyWhen a 250-ton section of the upper deck of the East Spancollapsed during the 7.1- magnitude Loma Prietaearthquake in 1989, it was a wake-up call for the entire BayArea. While the East Span quickly reopened within amonth, critical questions lingered; how could the BayBridge - a vital regional lifeline structure - be strengthenedto withstand the next major earthquake? Seismic expertsfrom around the world determined that to make each of theseparate elements seismically safe on a bridge of this size,the work must be divided into numerous projects. Eachproject presents unique challenges. Yet there is onecommon challenge - the need to accommodate the morethan 280,000 vehicles that cross the bridge each day.West Approach Seismic ReplacementProjectProject Status: Completed 2008Seismic safety retrofit work on the West Approach inSan Francisco - bounded on the west by 5th Street andon the east by the anchorage of the west span at BealeStreet - involved completely removing and replacingthis one-mile stretch of Interstate 80, as well as six onand off-ramps within the confines of the WestApproach’s original footprint.West Span Seismic Retrofit ProjectProject Status: Completed 2004Completed West Approach Replacement StructureThe West Span lies between Yerba Buena Island andSan Francisco and is made up of two completesuspension spans connected at a center anchorage.Retrofit work included adding massive amounts of steeland concrete to strengthen the entire West Span, alongwith new seismic shock absorbers and bracing.West Span of the Bay Bridge While Undergoing Seismic Retrofit12West ApproachWest Span
First Quarter 2009 Project Progress and Financial UpdateEast Span Seismic Replacement ProjectRather than a seismic retrofit, the two-mile-long East Span isbeing completely rebuilt. When completed, the new EastSpan will consist of several different sections, but will appearas a single streamlined span. The eastbound and westboundlanes of the East Span will no longer include upper and lowerdecks. The lanes will instead be parallel, providing motoristswith expansive views of the bay. These views also will beenjoyed by bicyclists and pedestrians thanks to a new pathon the south side of the bridge that will extend all the way toYerba Buena Island. The new span will be aligned north ofthe existing bridge to allow traffic to continue flowing on theexisting bridge as crews build the new span.The new span will feature the world’s longest SelfAnchored Suspension (SAS) bridge that will beconnected to an elegant roadway supported by piers(Skyway), which will gradually slope down towards theOakland shoreline (Oakland Touchdown). A newTransition Structure on Yerba Buena Island (YBI) willconnect the SAS to the YBI tunnel and will transitionthe East Span’s side-by-side traffic to the upper andlower decks of the tunnel and west span.When construction of the new East Span is completeand vehicles have been safely rerouted to it, theoriginal East Span will be demolished.Simulation of New East Span in Relation to West Span and the Golden Gate BridgeYerba Buena Island TransitionSASSkywayOakland Touchdown13
Toll Bridge Program Oversight Committee14
First Quarter 2009 Project Progress and Financial UpdateTOLL BRIDGE SEISMIC RETROFIT PROGRAMSan Francisco-Oakland Bay Bridge East Span ReplacementProject SummaryThe new East Span bridge can be split into four majorcomponents - the Skyway and the Self-AnchoredSuspension Bridge in the middle and the Yerba IslandTransition Structures and Oakland Touchdownapproaches at either end. Each component is beingconstructed by one to three separate contracts that allhave been sequenced together.Highlighted below are the major East Span contractsincluding their schedules. The letter designation beforeeach contract corresponds to contract descriptions in therest of the report.WestboundEastboundYerba Buena Island TransitionSASSkywayOakland Touchdown15
Toll Bridge Program Oversight CommitteeTOLL BRIDGE SEISMIC RETROFIT PROGRAMSan Francisco-Oakland Bay Bridge East Span Replacement ProjectYerba Buena Island Detour (YBID)As with all of the Bay Bridge’s seismic retrofit projects,crews must build the Yerba Buena Island TransitionStructures (YBITS) close to moving vehicles andwithout disrupting traffic. To accomplish this dauntingtask, eastbound and westbound traffic will be shifted offthe existing roadway and onto a temporary detoursupported by 200-foot-tall steel towers. Drivers will usethis detour, just south of the original roadway, untiltraffic is moved onto the new East Span.A YBID ContractContractor: C.C. Myers Inc.Approved Capital Outlay Budget: 442.2 MStatus: 64% CompleteThis contract originally was awarded in early 2004 toconstruct the detour structure for the planned 2006opening of the new East Span. Due to the readvertisement of the SAS superstructure contract in 2005because of a lack of funding at the time, the bridgeopening was rescheduled to 2013. To better integrate thecontract into the current east span schedule and toimprove seismic safety and mitigate future constructionrisks, the TBPOC has approved a number of changes tothe contract, including adding the deck replacement worknear the tunnel that was rolled into place over Labor DayWeekend 2007, advancing future transition structurefoundation work and making design enhancement to thetemporary detour structure.Current Progress on Detour StructureTunnel Approach Roadway ReplacementThe first in a series of activities to open the detour viaductwas completed in 2007 with the replacement of a 350foot long stretch of upper deck roadway just east of theYerba Buena Island tunnel. During this historic milestone,the entire Bay Bridge was closed over the 2007 LaborDay weekend so crews could demolish and replace theold section of the deck with a seismically upgraded6,500-ton precast section of viaduct that was literallypushed into place (see photo above).Status: Completed.These changes have increased the budget and forecastfor the contract to cover the revised project scope andpotential project risks.16West ApproachWest Span
First Quarter 2009 Project Progress and Financial UpdateDetour Viaduct Fabrication andConstructionThe detour viaduct will run generally parallel to theexisting lanes on the island and will tie back into theexisting bridge and tunnel. While speed limits will bereduced due to the turns needed to get on and off thedetour, the viaduct will look quite similar to the existingbridge with steel cross beams and girders and aconcrete roadway deck. To insure a good fit, the steelviaduct truss members were pre-fitted duringfabrication in South Korea and Oregon. Opening of thedetour to traffic is discussed on the following page.Demolition of Existing ViaductAfter shifting traffic onto the detour structure, crews willfocus on the demolition of the existing transitionstructure into the tunnel. The old transition structure willneed to be removed before construction of the newtransition structures from the SAS bridge to the YBItunnel can be completed.Status: The start of the demolition is pending theopening of the detour.Status: Most of the center portion of the detour viaducthas already been erected, including the concretedecks. At the west end of the detour, a cast-in-placeconcrete transition span is being poured to connect thedetour into the completed tunnel approach roadwayreplacement span. At the east end, support structuresare being erected to facilitate the roll-out/roll-in of thelast truss section, which will tie the detour into theexisting bridge.Overview of Yerba Buena Island
preparing project reports. AB 144 identified the Toll Bridge Seismic Retrofit Program and the new Benicia-Martinez Bridge Project as being under the direct oversight of the TBPOC. The Toll Bridge Seismic Retrofit Program includes: San Francisco-Oakland Bay Bridge West Approach Replacement Regional Measure 1 Projects Open to Traffic Status
