Title
Resolution to Award a Construction Contract to TSP Services, Inc. ($507,770.00; Bid No. ITB-4218) for the West Park Stormwater Completion Project
Memorandum
Attached for your review and approval is a resolution to award a construction contract to TSP Services, Inc. in the amount of $507,770.00 for the West Park Stormwater Completion Project.
In 2010, in addition to other park improvements, construction was performed on the Allen Creek Drain within West Park, with the goal of improving storm water quality in the drain. The design included the installation of eight swirl concentrator units (to remove suspended solids from the storm water prior to reintroducing it into the system) on the north and south branches of Allen Creek near the west side of the park.
During the construction of the project, flooding was experienced in and around the work area during one of the several large storms experienced that summer. In addition, in November of 2010, after the stormwater work had been completed, one of the swirl concentrators on the north branch collapsed, creating a sinkhole near the northwest corner of the park. Subsequent investigation revealed that the remaining swirl concentrators on the north branch were in various stages of failure as well.
City Staff engaged the engineering consulting services of Orchard Hiltz & McCliment (OHM) to analyze the failure of the swirl concentrator units, evaluate the original design, and propose changes to the system. OHM's contract was eventually extended to provide engineering plans and specifications to implement their proposed changes to the diversion manholes, which include rebuilding several storm structures, replacing the weirs with adjustable “stop log” assemblies, installing grated covers for stormwater surcharge relief, and restoration of the site upon completion.
Plans and specifications were distributed electronically to contractors, subcontractors, and suppliers. Seven bids were received and opened on April 10...
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