Construction Specifications.html

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Attached to
Mah751636C 25-15
Solicitation number
009_RFB_WRBWL_CY25-15
Issued by
Lyon County, Iowa

About this file

This construction specifications file pertains to a nutrient reduction wetland project solicited by the Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation and Water Quality, located in Mahaska County. The project involves constructing a traditional breakpoint nutrient reduction wetland with selective clearing, excavation, grading, riser outlet installation, tile and outlet structures, riprap placement, and seeding across approximately 6.6 acres. The scope encompasses approximately 24,926 cubic yards of earthwork, 368 linear feet of tile installation, concrete and nyloplast structures, 310 tons of riprap, and 25 cubic yards of grout. Bid submissions are due October 28, 2025, at 3:00 PM via the IMPACS online bidding system. A pre-bid conference is scheduled for October 7, 2025, at the Oskaloosa Library. Construction work (excluding seeding) must be completed by November 15, 2026, with seeding completion by December 15, 2026. The successful bidder must execute a performance bond of 100% of the contract award within 14 days of receiving the Notice-of-Award.

The estimated construction cost range is $250,000 to $350,000, with liquidated damages of $175 per day for delays in main work and $125 per day for seeding delays. Contractors must be registered with the Iowa Department of Inspections, Appeals & Licensing and submit a 10% bid bond. Bidders must provide evidence of financial data, previous experience, equipment ownership, and performance records. Non-Iowa corporations must provide proof of authorization to do business in the state prior to contract execution. Materials purchased for the project are exempt from sales and use taxes, and contractors will receive a specific sales tax exemption certificate. The project features a comprehensive nutrient reduction strategy with a water control structure, principal spillway, drawdown structure, and drainage tile modifications, serving a total drainage area of 181 acres with a wetland pool area of 1.99 acres.

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