Cal883229BN & BS (Calhoun)

This solicitation calls for the design‑build construction of two pumped nutrient‑reduction wetlands (North and South) in Calhoun County, Iowa. The work includes site clearing, extensive earthwork, installation of solar‑powered lift stations with pumps, forcemain and drainage pipe, water‑control structures, riprap, erosion‑control measures, and extensive seeding and vegetative restoration. The contract is a single‑award, lump‑sum bid with a total estimated construction cost between $550,000 and $750,000. • Scope covers excavation (~41,500 CY total), clay‑liner placement, pump station installation (solar + battery), PVC/HDPE pipe installation, and erosion control (silt fence, RECP turf mats, riprap). • Key deadlines: pre‑bid conference 4/24/2026, questions due 5/5/2026, sealed bid submission 5/20/2026, construction completion 12/31/2026 (seeding extends to 6/30/2027). • Mandatory requirements: registration with Iowa IMPACS, 10 % bid bond, 100 % performance bond, and registration with Iowa Department of Inspections, Appeals & Licensing.