Missoula Parking Commission approves $2.25 million GMP amendment for Bank Street garage repairs

The Missoula Parking Commission on a recorded vote approved a guaranteed maximum price (GMP) amendment for bid package 1 of the Bank Street garage repair project, authorizing the director to sign the amendment and allowing contractor mobilization to begin immediately.

The vote approved a GMP amendment in the amount of $2,254,318.62 for bid package 1 with Jackson Construction. The amendment covers site general conditions, demolition and concrete repair scopes, self-performed work by Jackson, structural steel erection for the canopy and vehicle entrance barricade, and a contingency allowance for shear-tab ("tea biscuit") repairs. The commission recorded aye votes and the motion passed; the director was authorized to sign the amendment.

The amendment is the first of multiple bid packages intended to accelerate weather-sensitive work, particularly the traffic-bearing membrane on the upper deck. Tyler, a Jackson Construction representative, said the split into two bid packages "buys us about a month on schedule" by allowing the team to start time-sensitive repairs sooner. The construction schedule presented targets approximately seven months of work, with substantial completion in early December and final completion the following week.

A single allowance in the GMP covers additional shear-tab repairs on precast double-Ts. The budgeted count is 306 locations; Jackson estimated a $425 credit per location if fewer are required, and the allowance covers the possibility that additional repairs will be needed after in-place inspection. Tyler explained, "we only know the final count once we get out there and actually do it," and described the allowance as a practical means to avoid an expensive, full exploratory jacking operation before work starts.

Jackson plans to self-perform most work in package 103A, including demolition, forming, placing concrete, reinforcing, and jacking and bearing-pad replacement; the firm expects to use unit-rate subcontractors for smaller tasks such as saw cutting and planter removal. Construction critical items—bearing pads and jacking equipment—were ordered to arrive the week after the meeting, and Jackson indicated it expects to issue subcontracts and give notices to proceed within days.

Commission discussion noted budget movement from earlier estimates: original pre-value-engineering estimates totaled roughly $3.9 million for related work; after value engineering that target was trimmed to approximately $3.4 million across both packages. This first GMP arrived slightly under the bid-package target but, when the allowance is fully included, shows a modest overage; staff said unspent contingency would return to the owner. The commission also discussed site management and public-safety concerns: one commissioner emphasized the importance of "public safety, cleanliness of the site, [and] organization of the site" as conditions of contractor performance.

Next steps: Jackson will mobilize and begin the work described in the GMP package, staff will report updated counts and allowance projections at the July 8 meeting, and the director was authorized to sign the amendment so work can proceed.