26-08 Cal883432B (Calhoun)

The Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation and Water Quality is requesting sealed bids for construction of a nutrient reduction wetland system in Calhoun County (Cal883432B, Bid No. 26-08), with bids due August 26, 2026 at 3:00 PM via the Iowa Management of Procurement and Contracts System (IMPACS) and a pre-bid conference scheduled for August 12 at 10:00 AM at the Calhoun County Conservation office in Rockwell City.

The scope encompasses selective clearing, excavation and grading (approximately 13,800 cubic yards of earthwork); installation of 769 linear feet of tile drainage (15-inch corrugated metal pipe and 12-inch high-density polyethylene); placement of 2,750 square feet of tied-concrete block erosion matting; construction of a three-chamber water control structure with slotted riser and bentonite anti-seep collar; placement of 31 tons of riprap and erosion stone; and restoration seeding of 4 acres. The project is located on property owned by Grodahl Farms Inc. in Section 32, Township 88 North, Range 34 West near Lytton, Iowa. All work must comply with Calhoun County requirements and current Natural Resources Conservation Service construction specifications; the water control structure requires engineer-approved shop drawings prior to fabrication. Contractors must register with the Iowa Department of Inspections, Appeals & Licensing and demonstrate ownership of at least 20 percent of their own equipment.

The estimated construction cost range is $135,000 to $155,000. Construction must be completed by November 30, 2026, with buffer and structure seeding due by December 15, 2026. Construction must commence within 7 days of a preconstruction conference held within 7 days prior to the approved start date. Bidders must submit a proposal guarantee (bid bond) equal to 10 percent of the base bid and a notarized affidavit confirming no collusion or fraud. The successful bidder must furnish a performance bond equal to 100 percent of the contract price within 14 days of award. Liquidated damages are $175 per day for work other than seeding and $125 per day for seeding. Written questions must be directed to Spencer Pech at ISG Inc. (spencer.pech@isginc.com, 563-920-5758) with a copy to Tracy Blocker, received by 3:00 PM on August 19, 2026.