Iowa City Community School District Bidopportunities #26-12 Emm1003114B

Emmet County nutrient-reduction wetland construction

Iowa is seeking a contractor to build the Emm1003114B nutrient-reduction wetland in Emmet County. - Government buyer: Iowa Department of Agriculture and Land Stewardship (IDALS), Division of Soil Conservation and Water Quality; the project also references USDA Natural Resources Conservation Service (NRCS). Ducks Unlimited, Inc. prepared project specifications. - OEM/vendor named: Wisconsin Flowgate is identified as an example supplier for the aluminum water-control structure, or an approved equal. No bidding vendor is identified. - Major construction work: Site clearing and stripping, drainage-tile investigation, excavation and earthfill, sheet-pile installation, pipe and water-control structure installation, riprap and grout placement, topsoil placement, and seeding. - Key quantities: 2,172 sq. ft. of steel sheet piling; 979 cu. yd. of general excavation; 1,348 cu. yd. of general earthfill, 337 cu. yd. of dam earthfill, and 826 cu. yd. of dam-core earthfill; 2,483 cu. yd. of topsoil; and 17.3 acres of seeding (0.5 acre structure and 16.8 acres buffer). - Drainage and structure items: 60 tons of sand drainfill; 104 linear ft. of 6-inch perforated CPP toe drain; 151 linear ft. of 12-inch HDPE dual-wall pipe; 123 linear ft. of CMP drawdown pipe; 40 linear ft. of 8-inch CMP outlet; 20 linear ft. of 15-inch CMP outlet; one aluminum water-control structure; one stoplog storage structure; and one 36-inch aluminum CMP riser inlet. - Stone and grout: 672 tons of IA DOT Class E riprap, 118 cu. yd. of concrete grout, and 50 tons of macadam stone. - Notable technical requirements: The sheet pile has specified strength and section properties, with SCZ 21N or approved equal recommended. Structure shop drawings and material documentation are required; seed mixes and grout designs require approval. Buffer seed must use Iowa ecotype native plants, including at least five native grasses and ten native forbs, unless otherwise approved. The plans also require protective measures for threatened or endangered species. - Estimated construction value: $375,000–$475,000. No calendar dates are included here; construction and seeding deadlines are summarized below.

Description

The Iowa Department of Agriculture and Land Stewardship is soliciting bids for construction of a breakpoint nutrient reduction wetland in Emmet County, Iowa. Work includes selective clearing, excavation, grading, steel sheet pile and tile installation, water-control and stoplog structures, riprap with concrete grout, and seeding. The listed quantities include just under 6,000 cubic yards of earthwork, 2,172 square feet of steel sheet pile, 378 linear feet of pipe installation, 672 tons of riprap, and 17.3 acres of seeding. The estimated construction cost is $375,000–$475,000; construction is due by September 15, 2027, and seeding by December 15, 2027.

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