The U.S. Army Corps of Engineers is conducting market research for an Optimized Remediation Contract (ORC) covering environmental remediation at Air Force Plant 44 (Arizona), Davis-Monthan Air Force Base (Arizona), and Nellis Air Force Base (Nevada). The contract is estimated to last 10 years and will be a firm-fixed price, performance-based contract with milestone-based payments rather than progress payments. Work includes investigation, design, construction, operation, and optimization of remedial systems across 17 Installation Restoration Program sites and 10 Military Munitions Response Program sites. The government seeks qualified sources capable of performing remediation activities such as maintaining remedies, optimizing for efficiency, and achieving site-specific objectives. No budget amount is specified, and the response deadline for this sources sought notice is 2:00 pm on 2 July 2026.