This is a total small business set-aside solicitation for a Multiple Award Task Order Contract (MATOC) for comprehensive environmental services, including planning, investigation, remediation, and construction. The contract has a total ceiling of $3.5 billion, with a 5-year base ordering period and one 3-year option period. The government anticipates awarding multiple contracts, with reserves for two Women-Owned Small Businesses and one Service-Disabled Veteran-Owned Small Business at the MATOC level. Performance locations are not specified in this description. Offerors must be registered in SAM to be eligible for award.