SUBJECT Amendment 0001 to Solicitation FA890326R0007 Environmental Construction Optimization Services (ECOS) This follows Presolicitation notice FA890326R0007A, the Solicitation is posted as FA890326RA007. The purpose of this amendment is as follows 1. Update and correct the Question and Answer due date which was erroneously indicated in SAM.GOV as Monday 1 July 2026 at 2PM CDT the correct due date for all questions to be submitted to the government is MONDAY 1 JUNE 2026 at 2:00PM CDT. 2. Replace the document Appendix_L_04__Self_Scoring_Matrix_Updated___Unlocked with Appendix_L_04__Self_Scoring_Matrix_Updated___Locked 3. Identify the email address that all potential offerors shall use to submit their question to the government: 772ess.ecos.acqteam@us.af.mil. The Solicitation Response Date is UNCHANGED. SUBJECT: Solicitation Notice; FA890326R0007 - Environmental Construction Optimization Services (ECOS) This follows Presolicitation notice FA890326R0007A, the Solicitation is posted as FA890326RA007. The 772d Enterprise Sourcing Squadron PKB Flight is issuing a Request for Proposal (RFP), conducted in accordance with RFO Part 15, Contracting by Negotiation, for the Environmental Construction Optimization Services (ECOS) Multiple Award Task Order Contract (MATOC) / Indefinite-Delivery/Indefinite-Quantity (IDIQ) contract. The Government anticipates awarding multiple contracts under this solicitation. The total ceiling for this IDIQ contract vehicle is $3.5 Billion. The ordering period will consist of a 5-year base period and one 3-year option period. Anticipated contract types include Firm-Fixed-Price (FFP), Cost-Reimbursable (CR), and Cost-Plus-Fixed-Fee (CPFF). This requirement is being solicited as a Total Small Business Set-Aside with additional Small Business socioeconomic reserves for two Women Owned Small Businesses (WOSB) and one Service-Disabled Veteran Owned (SDVOSB) Small Business at the MATOC level. This requirement is for comprehensive environmental services to support mission requirements. The broad scope of work encompasses environmental planning, investigation, remediation, construction, and compliance activities as detailed in the Performance Work Statement (PWS). The applicable North American Industry Classification System (NAICS) Code is 562910 (Remediation Services), and the Product Service Code is F108.The Government intends to utilize a Hybrid - Highest Technically Rated Offeror (HTRO), with a Minimum Technical Threshold Rating (MTTR) source selection methodology for this acquisition. Paper copies of the solicitation will not be issued. All parties interested in doing business with the Government must be registered in the System for Award Management (SAM) database to be eligible for award. Please include FA8903-26-R-0007 ECOS in the subject line of all emails addressed to the CO regarding this solicitation. Offerors may submit questions regarding this acquisition, the time frame for all questions is 10 days after the solicitation…