Cedar Rapids Ionwave #3311559-02 Addendum 1

Cedar Rapids Ellis Boulevard NW levee, floodwall, roadway, and utility construction

The City of Cedar Rapids Public Works Department is seeking unit-price bids for major flood-control and infrastructure improvements along Ellis Boulevard NW. - Buyer: City of Cedar Rapids, Iowa — Public Works Department, Engineering; Linn County. - Project: Ellis Blvd NW Levee and Floodwall Improvements, Contract 3311559-02; the work runs from Q Avenue NW to Ellis Park. HR Green, Inc. is identified as the designer. No product OEMs or named construction vendors are specified; IonWave is named as the City's bid-submission platform. - Estimated construction cost: $4,530,000. - Main work: Build an earthen levee and floodwall; remove, realign, and reconstruct the roadway; and improve water, sanitary sewer, storm sewer, pavement, pedestrian facilities, traffic controls, landscaping, and erosion controls. - Major quantities: Floodwall (1 LS); PZ-22 sheet piling (5,100 SF); HP14x73 steel piles (1,467 LF); 8-inch PCC roadway pavement (7,474 SY); 15-inch RCP storm sewer (1,726 LF); and 8-inch water main (139 LF), plus the utility and roadway items listed below. - Notable requirements: Work is staged, maintain access to Ellis Park and its shop for City vehicles, and allow at least 30 days for settlement of designated levee fill. Ellis Boulevard is to reopen after the early work stages; final completion follows the staged construction period, with a four-year maintenance period. Pile-driving vibration is limited to 1 inch per second peak particle velocity, and pile-driving hours are limited to 7:00 a.m.–5:00 p.m. Minimum casing thicknesses are 0.250 inches for 16-inch casing, 0.312 inches for 30-inch casing, and 0.344 inches for 36-inch casing. Bypass pumping may be needed if a force main cannot remain in operation. A temporary barrier and driveway are required if the home at 1845 Ellis Blvd NW remains in place during the relevant work.

Description

The project involves installing an earthen levee and floodwall, removing, realigning, and reconstructing Ellis Blvd NW, and completing associated water main, sanitary sewer, and storm sewer improvements. Work is located on Ellis Blvd NW from Q Avenue NW to Ellis Park in Cedar Rapids, Iowa. The engineer’s opinion of probable cost is $4,530,000. The bid deadline is November 20, 2026, and final completion is scheduled for October 27, 2028.

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