26-09 Har892022C (Hardin)

The Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation and Water Quality is requesting sealed bids for construction of a tile zone nutrient reduction wetland in Hardin County (Project ID: Har892022C, Bid No. 26-09), with bids due August 26, 2026 at 3:00 PM via the Iowa Management of Procurement and Contracts System (IMPACS) and public bid opening through Microsoft Teams the same day. A pre-bid conference was held August 13, 2026 at the Hardin County ISU Extension Office.

Bidders must be registered with the Iowa Department of Inspections, Appeals & Licensing. The work involves approximately 17,100 cubic yards of earthwork, 2,800 linear feet of drain tile investigation and removal, 79 linear feet of 36-inch diameter reinforced concrete pipe (RCP), 3,244 linear feet of high-density polyethylene (HDPE) corrugated profile wall pipe with corrugated metal pipe tile outlets, construction of a 4-foot by 4-foot concrete water control structure with stop log storage, and 6.8 acres of seeding (1.5 acres of structure and channel seeding, 5.8 acres of buffer seeding). Construction must commence within seven days of a preconstruction conference and be completed by June 15, 2027; buffer seeding is due June 30, 2027, and structural seeding by September 15, 2027. Seeding must follow Iowa CS-006 seeding periods using native Iowa ecotype seed mixtures.

The estimated construction cost range is $200,000 to $300,000. Bidders must submit a bid bond equal to 10 percent of the base bid amount and, if awarded, furnish a Performance Bond equal to 100 percent of the contract price within 14 calendar days of award. Liquidated damages are $175.00 per day for all work except seeding and $125.00 per day for seeding delays. Earthfill compaction in the embankment core requires Method 2 compaction to 90 percent maximum density per ASTM D 698. Written questions on plans and specifications are due August 20, 2026 at 3:00 PM to the engineer, Dan Jensen, P.E., for inclusion in a final addendum. Construction materials are exempt from sales and use tax under Iowa Code Sections 422.42(16) and (17) and 422.47(5).