Call 001 77-0352-490

United Contractors Inc & Subs & Cramer & Assoc, Inc, JV has been issued a solicitation under number 77-0352-490 by the Iowa Department of Transportation (IADOT) with a posting date and response deadline of July 28, 2026, for the construction of a soil nail retaining wall with aesthetic concrete facing along highway corridors in Polk County, Iowa, including locations on I-35, I-80, and I-235. The work involves internal reinforcement of soil masses using grouted nails, installation of horizontal and vertical drainage systems, and application of mesh-reinforced shotcrete followed by a structural cast-in-place concrete facing. All design and execution must comply with Iowa DOT specifications including Sections 2501, 4136, and 2513.03, as well as AASHTO and ASTM standards for materials like reinforcing steel, shotcrete, and grout. The contract requires strict adherence to quality thresholds, including a minimum 4,000 psi compressive strength for shotcrete at 28 days and 3,000 psi for nail grout, with acceptance contingent upon on-site testing and Engineer approval before advancement. The contractor must submit detailed shop drawings, mix designs, and sequencing plans 45 days prior to work, along with approved mock-up panels and calibration records for testing equipment. Personnel qualifications are stringent, mandating supervising engineers with three years of experience in nailed walls, experienced drilling and shotcreting operators, and all staff must be pre-approved. Weekly certified payrolls are required for both prime and subcontractor labor, using Iowa DOT forms, and no calcium chloride or expansive additives are permitted. Modifications through seven addenda issued between June and July 2026 have updated references to plan sheets and settlement periods, but no formal contract type, pricing structure, or evaluation factors are disclosed. The place of performance is designated as Polk, Iowa, with no specified start or end dates, invoicing method, payment office, or contract value indicated. All work is subject to Engineer oversight, with suspension authority for noncompliance and no provision for time or cost adjustments due to substitution of unqualified personnel.