Iowa City Community School District Bidopportunities #26-17 Ben850929B

Construction of the Ben850929B Nutrient Reduction Wetland in Benton County, Iowa

The Iowa Department of Agriculture and Land Stewardship is seeking a contractor to build the Ben850929B Nutrient Reduction Wetland in Benton County. - Government buyer: Iowa Department of Agriculture and Land Stewardship (IDALS), Division of Soil Conservation; project manager Shane Wulf. Natural Resources Conservation Service (NRCS) construction specifications also apply. - Project: Wetland and dam construction near Vinton, Iowa, including site preparation, drain-tile work, excavation, embankment, water-control structures, erosion controls, and seeding. - Major quantities: 18,151 cubic yards across listed earthwork and topsoil items; 1,150 square feet of steel sheet piling (another bid schedule lists 1,183 square feet, a discrepancy to verify); 1,158 linear feet of 6-inch dual-wall polyethylene pipe; and 1,268 linear feet of specified CMP pipe and outlets. - Other materials: One 24-inch aluminized CMP drawdown riser, one 48-inch CMP water-control structure, 13 stoplogs, one 18-inch aluminized CMP flared end section, 668 tons of Class E riprap, 35 tons of 2-inch clean stone, 72 cubic yards of concrete grout, 430 square yards of Type 5B turf reinforcement mat, and 515 linear feet of silt fence. - Services: Site stripping, crop-damage compensation, seeding, mobilization, 2,443 linear feet of drain-tile investigation and removal, earthwork, topsoil placement, and installation of pollution controls. Shive-Hattery is named for construction observation, staking, and as-built surveying. - Notable requirements: Install an 18-inch wetland-bottom clay liner in two lifts; use specified soils and compaction methods for embankment work; provide required outlet and water-control appurtenances; and comply with project plans, NRCS standards, and applicable erosion-control specifications. Seeding must occur within the specified periods. A proposal guarantee equal to 10% of the base bid and a performance bond of at least 100% of the award are required. - OEMs and part numbers: No product OEM or manufacturer, commercial product part number, or brand is specified. Shive-Hattery is the named engineering and construction-support firm.

Description

The project is for construction of a nutrient reduction wetland in Benton County, Iowa. Work includes selective clearing, excavation, grading, sheet piling, tile and pipe installation, water-control structures, riprap and concrete grout, turf reinforcement mat, pollution controls, and seeding. Construction is to be completed by November 1, 2027, with seeding completed by December 15, 2027 within the specified seeding periods. The estimated construction cost is $250,000–$350,000.

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