Iowa Impacs #009-RFB-WRBWL-CY26-15

Construction of a Nutrient Reduction Wetland in Winneshiek County, Iowa

The Iowa Department of Agriculture & Land Stewardship is seeking a contractor to build a nutrient reduction wetland in Winneshiek County. - Government buyer: Iowa Department of Agriculture & Land Stewardship, Division of Soil Conservation and Water Quality. - Project: Winn971022B conventional nutrient reduction wetland construction near Spillville, Iowa. Shive-Hattery is identified as the project engineer. - Work requested: Site preparation, drain-tile investigation and removal, excavation, earthfill and topsoil placement, polyethylene pipe installation, water-control structures, steel sheet piling, stone, grout, seeding, erosion control, and fencing. - Major quantities: 35,150 cubic yards of listed excavation and earthfill work; 22,801 cubic yards of topsoil; 8,385 linear feet of drain-tile investigation/removal; 16,229 linear feet of polyethylene pipe; 2,344 square feet of steel sheet piling; 1,475 tons of riprap; 188 cubic yards of grout; and 4,780 linear feet of new fence. The listed seeding totals 18.4 acres. - Products and brands: No OEMs, manufacturers, or product brands are specified. Pipe and structures are specified by material, type, and dimensions, including corrugated polyethylene pipe and corrugated metal pipe (CMP). - Notable requirements: Includes wetland-bottom scarification and recompaction in specified lifts, replacement of unsuitable material, and installation of erosion controls. Construction is scheduled to start shortly after the preconstruction meeting, with construction and seeding work required to finish during 2027. - Estimated construction value: $900,000–$1,100,000.

Description

This request for bids is for construction of a conventional nutrient reduction wetland in Winneshiek County, Iowa. Work includes clearing, drain tile investigation and removal, excavation and grading, installation of HDPE pipe and water-control structures, steel sheet piling, riprap, seeding, and fencing. The notice estimates construction costs between $900,000 and $1,100,000, with construction due by October 31, 2027. Bids are due December 10, 2026, and must include a bid bond equal to 10% of the bid amount.

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