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Bay Bridge Info

Bay Bridge Documents

Bay Bridge Documents

Blue Tag Logs

The Blue Tag logs listing Blue Tags issued for work on the Self-Anchored Suspension Span of the San Francisco-Oakland Bay Bridge can be found at this link:

The Blue Tag material release procedure is a mechanism to document material suitability decisions. The Department tracks material issues that, although different from what the contract identified in the original specifications, have been determined through engineering analysis to meet the intended purpose of the original contract.

Note that some entries on the logs are listed as “pending.” Generally speaking, in those cases, the resolution has been identified, the suitable material has been shipped to the jobsite and incorporated into the work. However there may be some minor additional work still pending at the jobsite or there may be adjustments in contract language still pending to complete the documentation. Both issues may be a low priority but will be completed before the project is accepted as complete and outstanding entry items are closed.

State Letters

The state letters issued to the contractor relating to work on the Self-Anchored Suspension structure performed in China are available to view at

Caltrans documents certain important communications to contractors during the course of construction projects. These letters were written on behalf of the Department to the prime contractor regarding work performed at ZPMC. They generally provide or decline authority to follow through on various types of work, and are numbered and retained for future reference.

Weld Inspection Reports

Caltrans documentation relating to welds performed in China on the Self-Anchored Suspension structure are available at these links:
SFOBB Self-Anchored Suspension Bridge Project Project Team Response to QA / QC Expert Panel Recommendations

Caltrans requires contractors to inspect every weld performed on a project. Caltrans personnel review the contractor’s inspection documentation and independently inspect a portion of the welds a second time. Caltrans utilizes a range of technology to perform the inspections. And the process generates a range of documents- for example, Source Inspection Reports, Welding Inspection Reports, and Welding Witness Reports, all of which are contained at the link above.

Contract requirements are used to determine whether welds are acceptable. When projects that require large quantities of welds, Caltrans and the contractor work together to address issues with the welding process and the resulting welds to resolve issues that may arise. When Caltrans does not accept a weld, the weld is removed and a new weld is made. That replacement weld is then inspected and scrutinized just as the original weld was. That process is repeated until an acceptable weld is in place.

Nonconformance Reports and Resolution Documents

The NCRs issued on San Francisco – Oakland Bay Bridge east span replacement projects can be viewed at these links:

Quality Assurance (QA) is used to ensure that fabrication, and related activities, are being performed correctly by construction contractors, fabricators and suppliers. It often includes examining fabrication facilities before work begins and continues through fabrication and approval of material and components used at the job site. Described generally, QA includes systematic, administrative activities that generally seek to improve production and avoid defects.

Nonconformance Reports (NCRs) are issued by Caltrans QA personnel to communicate to the resident engineer that a contractor’s quality control process or test does not comply with contract requirements. NCRs may relate to a process or to a finished product. Or an NCR may alert engineers to a potential irregularity or problem that needs to be addressed. That irregularity may simply involve documentation, or it could involve a test result that does not meet contract specifications.

The nature of the issue determines the approach Caltrans takes to resolving the NCR. A given resolution may occur informally, particularly if the product fabricated meets or exceeds the contract specification, or a resolution may require significant engineering analysis and consideration. In either event, Caltrans works with the contractor to ensure that materials and components incorporated into the project are structurally sound and will perform as needed. Those solutions are captured in the resolution documents.

Notices of Potential Claims

The Notices of Potential Claim submitted by contractors, and related documentation, relating to San Francisco-Oakland Bay Bridge east span projects can be viewed at this lin:

In general, these documents show how Caltrans responds to claims brought forth by the contractor during the course of construction.

The specifications in every construction contract include a claims resolution procedure. Under this procedure, a NOPC is the first formal notification a contractor must provide to Caltrans when it believes a contractual issue has arisen. That notice triggers discussions with the contractor and allows Caltrans to analyze the circumstances giving rise to the claim.

These documents show a range of issues including relatively minor disputes to more complex claims. As such, the negotiations—and documentations--may be straightforward or may be detailed and involved, depending on the issue.

The contractor and Caltrans work hard to reach a resolution. In the course of this work, Caltrans may deny some NOPCs, the contractor may drop some NOPCs, and some NOPCs may mature into claims. An actual claim may be resolved during the progress of the work or the contractor may present the final claim at the conclusion of the project.

Change Orders

The Department is providing Change Orders for the SFOBB eastern span replacement structure contracts at this link:

It is important to be clear on what a Contract Change Order (CCO) actually is. Construction contracts developed and administered by the Department contain detailed drawings (contract plans and Standard Plans) and specifications (special provisions and Standard Specifications) that describe in specific detail the work to be done and the materials to be used. The specifications also outline the quality to be attained, the timeframe for when the work should be completed and how the contract will be administered. The contracts are advertised for a specific time period, bids are solicited and contracts are awarded to the responsible bidder who submits the lowest bid for the contract work.

Detailed drawings and specifications are designed and developed by civil engineers based on known existing conditions and desired end product with educated assumptions of how a construction contractor would approach the work to be done. Specific items of work to be performed are identified and quantities of each work item are estimated, both for volume (how much item work there is) and for estimated cost (cost per unit of work).

On every contract, the type and/or quantity of work needed on a particular item will vary based on actual conditions in the field that were not known during the development phase. Also, actual conditions may dictate a different method of construction or a different solution than contemplated. As a construction contract progresses, ways to expedite work to meet project goals or ways to improve on the original design may become apparent. Such variations from the original terms of the construction contract are handled by formal changes to the original contract, by CCO.

A CCO is a legally binding document used to make changes to any part of the original contract. Every construction contract has CCOs; they are a normal part of administering a construction contract.

These CCOs constitute the remainder of the outstanding documents specified by this request. Therefore, this is the Department’s final response to your request.