Iowa City Community School District Bidopportunities #26-15 Winn971022B

Construction of the Winn971022B (Shatek) Nutrient-Reduction Wetland

Iowa is seeking a contractor to build the Winn971022B (Shatek) nutrient-reduction wetland in Winneshiek County, near Calmar. - Government buyers: Iowa Department of Agriculture and Land Stewardship (IDALS); project specifications are also provided by the USDA Natural Resources Conservation Service (NRCS), Iowa. - Project: Wetland construction on a 27.55-acre easement, serving a 588.1-acre drainage area and creating a 12.24-acre wetland pool. The planned berm is 1,418 feet long. - OEMs and named firms: Skyline Steel / Nucor is cited as the design basis for the steel sheet piling, with engineer-approved equals permitted. Shive-Hattery, Inc. is identified as project engineer, not as the construction contractor. No other construction vendors or manufacturers are named. - Major work and quantities: Earthwork includes 4,070 CY general excavation, 14,456 CY waste excavation, 1,861 CY general earthfill, 8,536 CY general dam earthfill, 6,228 CY dam-core earthfill, and 22,801 CY topsoil placement. Other major quantities include 8,385 LF of drain-tile investigation and removal, 2,344 SF of steel sheet piling, 3,350 LF of silt fence, and 4,780 LF of new fencing. - Pipes and structures: Install 7,385 LF of 4-inch single-wall polyethylene pipe; 4,275 LF of 4-inch dual-wall pipe; 2,960 LF of 6-inch dual-wall pipe; 1,222 LF of perforated 6-inch toe-drain pipe; and 387 LF of 8-inch dual-wall pipe. Also install one 24-inch drawdown riser, one 48-inch water-control structure, 100 LF of 18-inch drawdown pipe, one 18-inch flared end section, four 8-inch CMP tile outlets, and two 10-inch CMP tile outlets. - Other materials and restoration: 1,475 tons of Class E revetment riprap, 80 tons of erosion stone, 95 tons of 2-inch clean stone, and 188 CY of concrete grout. Seed about 1.8 acres of structural areas and 16.6 acres of buffer areas; install five-strand barbed-wire fence with an electrified top wire and two 16-foot pipe gates. - Notable requirements: Work includes selective clearing, borrow-area preparation, wetland-bottom scarification and compaction, unsuitable-material replacement, tile and water-control construction, erosion and pollution controls, and site restoration. Seeding includes native grasses and forbs in buffer areas; riprap must meet the specified Iowa DOT Class E revetment standard. - Estimated construction value: $900,000–$1,100,000. - Document identifier note: The plan set identifies WINN971022B, while the specifications summary also references WINN970905B; confirm the applicable project identifier with the buyer.

Description

The project is for construction of a conventional nutrient reduction wetland in Winneshiek County, Iowa. Work includes selective clearing, drain tile investigation and removal, excavation and grading, installation of HDPE pipe and CMP tile outlets, steel sheet piling, water-control structures, riprap and grout, seeding, and fencing. The source lists estimated construction costs of $900,000–$1,100,000. Construction is due by October 31, 2027, with buffer and structural seeding due by December 31, 2027.

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