This is a presolicitation notice for a $3.5 billion Multiple Award Task Order Contract for comprehensive environmental services, including planning, investigation, remediation, construction, and compliance. The contract will have a 5-year base period and one 3-year option period, with a total ceiling of $3.5 billion. It is a Total Small Business Set-Aside, and the anticipated contract types include Firm-Fixed-Price, Cost-Reimbursable, and Cost-Plus-Fixed-Fee. The official solicitation is expected to be posted on or about May 21, 2026. No location for performance of services is specified.