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

Car833409A nutrient-reduction wetland construction and solar pump system

Iowa is seeking a contractor to build the Car833409A “Thrills Hills” nutrient-reduction wetland in Carroll County, including water-control infrastructure and a solar-powered pumping system. - Government buyer: Iowa Department of Agriculture and Land Stewardship (IDALS), Division of Soil Conservation and Water Quality (IDALS-DSWQ); the procurement documents identify the Division but no further office. The project is in Carroll County, Iowa. - Project scope: Construct a wetland that treats water pumped from an existing ditch. Work includes clearing and site preparation, excavation and grading, embankment and earthfill, drain-tile investigation and removal, pipe and outlet installation, a pump basin and outlet structures, riprap, and seeding. Approximate overall quantities include 19,861 cubic yards of earthwork, about 835 linear feet of pipe, 29.3 tons of Class E riprap, and about 2.4 acres of seeding; individual bid schedules and plan summaries contain some differing line-item quantities. - Highlighted OEM/equipment: The plans name a Carry CP-04 axial pump with a 17-degree impeller, or approved equal. The specified system is a 3-phase, 3 HP pump rated at approximately 340 GPM at 11.25 feet of total dynamic head; another specification describes a 330 GPM at 11 feet alternative. The solar lift station includes a DPC2500 pump controller/solar drive, solar panels, float switches, mounting hardware, wiring, surge/lightning protection, generator connection, and contractor-supplied discharge piping and check valve. Specifications also name an Enfusion Blender solar VFD, Sun-Rac mounting hardware, MNSPD300-DC surge protection, PVDISCO disconnect, Valterra gate valve or approved equal, and Hickenbottom intake or approved equal. - Principal structures and materials: One SW-401 pump basin, one modified 78-by-78-inch SW-513 outlet structure, reinforced concrete pipe, dual-wall non-perforated corrugated HDPE pipe, CMP tile outlets, anti-seep collars, concrete aprons/footings/bar guards, and Class E riprap. See line-item arrays for reported quantities, including quantity differences across the plans and bid schedules. - Construction and quality requirements: Earthfill is to use suitable cohesive material; sand and gravel are prohibited, with specified compaction methods and rock-size limits. Seeding requirements include smooth brome and fertilizer for structure/channel areas and a native mix of at least five grasses and ten forbs for buffer areas. The contractor is responsible for quality control and correcting nonconforming work; required submittals include material certifications, approved shop drawings, and an approved seed-mix design. - Other named organizations: Bolton & Menk is identified as the project designer; Thrills Hills LLC is identified as the property owner. The specifications reference Iowa SUDAS and Iowa DOT standards. - Estimated construction value: $175,000–$275,000. The successful contractor provides supervision, labor, materials, and equipment for the construction project. - Performance: Construction is to begin within seven days after the preconstruction meeting unless otherwise agreed. The solicitation sets separate completion deadlines for construction and seeding; no option years or annual subscription are indicated.

Description

The Iowa Department of Agriculture and Land Stewardship is soliciting bids to construct the Car833409A Nutrient Reduction Wetland Project in Carroll County, Iowa. Work includes selective clearing, excavation and grading, tile and outlet structures, installation of a solar-powered pump system, riprap placement, and seeding. The project includes approximately 19,861 cubic yards of earthwork, 29 tons of riprap, and 2.4 acres of seeding; the notice lists an estimated construction cost of $175,000–$275,000. Construction is due by September 1, 2027, and seeding by December 15, 2027.

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