Cobbold Wrackline JV bridge design-build proposal

The deal

Cobbold Constructors and Wrackline Marine, with Nye Trask Engineers as lead designer, answering RFQ TSD-26-DB-0412 for Bridge 58-0412, a crossing carrying 46,200 vehicles a day.

What the selection panel needed to see

That four through lanes would stay open at every peak for the whole job, and who would carry each risk between two partners.

What we built

• A staging drawing that scrubs through 54 months of spans and lanes
• A closure calendar that feeds the cost sheet and the finish date
• A joint venture chart that works as a clickable risk register
• A quantities sheet in the DOT’s own format, with lines that can drop

Written for people who read plan sets all day

A brochure asks a DOT panel to change how it reads. A title block, a sheet number and stationing tell the Chief Engineer in one glance that this team speaks his language. The whole concept grew from one sentence in RFQ section 2.3, that the corridor shall carry four through lanes during peak periods for the full contract duration.

Stop at month 24 and count lanes

Every other bidder would write that traffic will be maintained. On TC-101 a traffic engineer drags across the job and counts. The north structure goes up first, all four lanes move onto it, the old bridge comes out, and the south structure rises in its footprint.

The option we gave up, with its price

The first traffic shift needs 312 closure hours between June 4 and August 26, 2029. The default plan of 32 nights and 2 weekends stays at 50,063 vehicle-hours of delay against the 60,000 limit, with $780,800 of closure cost in Q-701. Six weekends is cheaper for the contractor, so the page prices it and shows it breaking the limit.

A name beside every risk

Cobbold holds 60 percent and Wrackline holds 40, and both are liable for the whole job. Rock at Pier 3 opens the register with a $3.6M allowance, split into 40 points for Tamarack, 15 for Cobbold and 45 for Wrackline. The partner-failure question has its own button, out in the open.

Five readers, five sheets

• The Chief Engineer sees who stamps what, with a 21-day review clock.
• The District Traffic Engineer tests lane width. Eleven feet keeps a 2.75-foot shoulder and demand at 0.80 of capacity.
• The Environmental Resources Manager sees vibrated casing keep the noise limit inside 410 feet.
• The Procurement Officer checks 8 pass-or-fail lines, then a matrix with one exception and two partials, each with its reason.
• The Deputy Secretary for Finance reads a peak year of $80.0M.

Mark it received

The sealed price comes in Step 2, so Q-701 stands as a cost understanding, $253,592,619 at today’s choices and $11,407,381 under budget. The only move asked for now is marking the package received or sending a question. The panel shortlists on January 15, 2027.

The detail that does the work

The open items name the rock at Pier 3, where two 1958 borings disagree by eleven feet and the team asks to drill in Step 2.