Title
Resolution to Approve a Construction Contract with Z Contractors, Inc. for the Replacement of Sequoia No. 1 and Sequoia No. 2 Sewage Lift Stations, ITB No. 4670 ($732,777.00)
Memorandum
Your approval is requested for a construction contract with Z Contractors, Inc. in the amount of $732,777.00 for the replacement of Sequoia No. 1 and Sequoia No. 2 Sewage Lift Stations (LS). The City operates and maintains eight LS, which lift sewage from lower to higher elevations as needed to allow it to flow by gravity to the City's Wastewater Treatment Plant (WWTP) for treatment. An evaluation of all eight LS was performed during development of the 2004 WWTP Facilities Master Plan, which identified deficiencies and estimated the useful remaining life of each station.
Two of the LS were replaced prior to 2019 and one LS, South Boulevard, is scheduled to be eliminated in FY 23. The remaining five LS were identified as needing replacement due to their age and condition and design documents for this work were prepared in 2019. Astor and Franklin Sewage LS were replaced in 2020, Sequoia No. 1 and Sequoia No. 2 LS are to be replaced in FY 22 and Arbor Landings LS is to be replaced in FY 23 as scheduled in the City of Ann Arbor Capital Improvements Plan. The replacement of Sequoia No. 1 and Sequoia No. 2 LS includes demolition of existing structures, modification of an existing wet well structure, installation of new pumps and valves, and improvements to station electrical and control systems. The Sequoia LS construction area contains subsurface utilities that will increase complexity of construction. The project complexities are mainly due to the presence of a 60-inch diameter storm sewer that runs through the site and the close proximity to Sequoia Boulevard. Due to the age of the existing lift station, there may also be unknown subsurface utilities that may impact construction.
In response to ITB No. 4670, four bids were received to construct replacement of Sequoia No....
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