Specifications - REVISED.pdf

This revised technical specifications document supports a sealed bid solicitation from the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation and Water Quality, for construction of a nutrient reduction wetland system (Cal883432B, Bid No. 26-08) in Calhoun County near Lytton, Iowa on property owned by Grodahl Farms Inc. The project scope encompasses selective clearing and excavation of approximately 13,800 cubic yards of earthwork; installation of 769 linear feet of tile drainage using 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. A pre-bid conference is scheduled for August 12, 2026 at 10:00 AM at the Calhoun County Conservation office in Rockwell City. Sealed bids are due August 26, 2026 at 3:00 PM via the Iowa Management of Procurement and Contracts System (IMPACS), with written questions due by 3:00 PM on August 19, 2026 directed to Spencer Pech at ISG Inc. Construction must commence within 7 days of a preconstruction conference and be completed by November 30, 2026, with buffer and structure seeding due by December 15, 2026.

The estimated construction cost range is $135,000 to $155,000. 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. Contractors must register with the Iowa Department of Inspections, Appeals & Licensing and demonstrate ownership of at least 20 percent of their own equipment. All work must comply with Calhoun County requirements and current Natural Resources Conservation Service construction specifications, with the water control structure requiring engineer-approved shop drawings prior to fabrication. Liquidated damages are assessed at $175 per day for work other than seeding and $125 per day for seeding activities.