Chicago is planning the construction of a 4,535m long deep combined sewer tunnel plus a numbers of drop shafts for the first stage of the 39th Street conduit rehabilitation project.
The sewer is to be 4.6m i.d., and the drop shafts will range in diameter from 2.2m-4.6m at depths ranging from approximately 70m to 77m. In addition, the tunnel will connect into the existing deep sewer system, known as the Tunnel and Reservoir Plan (TARP), and the contractor will build a variety of other hydraulic structures.
According to the call for bids from the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC), the estimated cost of the project is US$93.2M.
A pre-bid conference was held late last month. The deadline for submission of bids for the contract (01-103-2S) is 17 June, which is also the date the sealed bids will be opened.
The required bid deposit is 10% of the client’s estimated project cost, or US$932,000. The client has also set a minimum of 40% of labour and materials costs in the tender offer to be directly borne by the main contractor.
