Iowa City Community School District Bidopportunities #26-10 Car833409A (Carroll) RFB

Construction of a solar-pumped nutrient-reduction wetland in Carroll County, Iowa

The Iowa Department of Agriculture and Land Stewardship is seeking a contractor to build the Car833409A nutrient-reduction wetland in Carroll County, including earthwork, drainage structures, and a solar-powered pumping system. - Government buyer: Iowa Department of Agriculture and Land Stewardship (IDALS), Division of Soil Conservation and Water Quality; the project is associated with the Division’s wetland and water-quality work. - Project: Car833409A Nutrient Reduction Wetland Project, also called the Thrills Hills Wetland, in Carroll County, Iowa. The wetland will treat water pumped from an existing ditch to reduce nutrient runoff. - Major construction: Site preparation, excavation and grading, embankment and earthfill construction, drain-tile investigation and removal, pipe and outlet installation, pump installation, riprap placement, and seeding. The project documents cite approximately 19,861 cubic yards of earthwork, about 835 linear feet of pipe, about 29.3 tons of Class E riprap, and roughly 2.4 acres of seeding. - Key equipment and structures: One solar pump system, one SW-401 pump basin, and one modified 78-by-78-inch SW-513 outlet structure. The pump specification identifies a Carry CP-04 pump with a 17-degree impeller, or approved equal, rated at 340 GPM at 11.25 feet TDH; another specification describes an alternative rated at 330 GPM at 11 feet TDH. The solar system includes panels, a drive/controller, float switches, wiring, and surge protection. The plans identify a DPC2500 controller/drive. - Named manufacturers or product brands: Carry, Enfusion Blender, Sun-Rac, Valterra, and Hickenbottom are named in the equipment or structure specifications. The specifications also name MNSPD300-DC and PVDISCO surge/disconnect products. Bolton & Menk is identified as the project designer, not as an equipment OEM. No single pump or complete solar-system OEM is designated; approved equal alternatives are allowed in specified cases. - Notable requirements: Construction is to begin within seven days after the preconstruction meeting unless otherwise agreed. The documents set separate completion requirements for construction and seeding. Buffer planting calls for a native mix with at least five native grasses and ten native forbs; structure and channel seeding has specified seed, fertilizer, and mulch requirements. Contractor work also includes required material certifications, approved shop drawings for applicable structures and pipes, and quality control and correction of nonconforming work. - Estimated value: The documents give differing estimates: $175,000–$275,000 in the notice and $150,000–$250,000 on the bid information page. The combined indicated range is $150,000–$275,000. - Quantity caveat: Some attachment summaries and extracted bid schedules report conflicting quantities for pipe, concrete aprons, collars, and seeding. The line items below use the clearest plan or bid-book quantities and note material conflicts where they affect interpretation.

Description

The project is to construct a nutrient reduction wetland in Carroll County, Iowa, treating water from an existing ditch with a solar-powered pump. Work includes selective clearing, excavation and grading, tile and outlet structures, pump and tile installation, riprap placement, and seeding. The listed quantities include approximately 19,861 cubic yards of earthwork, 835 linear feet of pipe, 29 tons of riprap, and 2.4 acres of seeding. Construction is to be completed by September 1, 2027, and seeding by December 15, 2027. The notice states an estimated construction cost range of $175,000–$275,000; the bid information page lists $150,000–$250,000.

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