AMENDMENT 0005, SOLICITATION Notice; FA890326R0007 - Environmental Construction Optimization Services (ECOS)

SUBJECT Amendment 0004 to Solicitation FA890326R0007 Environmental Construction Optimization Services (ECOS) This follows Presolicitation notice FA890326R0007A, the Solicitation is posted as FA890326RA007. THE PURPOSE OF THIS AMENDMENT 0004 IS TO PROVIDE RESPONSES TO CONTRACTOR QUESTIONS THAT WERE RECEIVED TIMELY (PRIOR TO 1 JUNE 2026 AT 14:00 CDT) HOWEVER THE QUESTIONS AND THE GOVERNMENT RESPONSE WERE INADVERTENTLY LEFT OFF THE PREVIOUS AMENDMENT 0003. IN ADDITION, EIGHT PREVIOUSLY ANSWERED QUESTIONS FROM AMENDMENT 0003 QUESTION AND ANSWER HAVE BEEN UPDATED. THIS AMENDMENT DOES NOT EXTEND THE PROPOSAL DUE DATE WHICH REMAINS MONDAY 13 JULY 2026 AT 14:00 CDT. 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. All communications related to this solicitation shall be submitted in writing to the Contracting Officer, Mr. Nathan J. Fry, 772d ESS/PKB at: 772ess.ecos.acqteam@us.af.mil Attachments: Attachment 1 ? ECOS PWS Final Attachment 2 ? ECOS [Reserved] Attachment 3 ? ECOS Section L Final Attachment 4 ? ECOS Section M Final Attachment 5 ? On and Off Ramping Procedures Final CDRL B003 DID Tailoring DI-MGMT-81861_AttachmentExhibit A ? CDRLS ECOS Exhibit B ? CDRLS ECOS Exhibit C ? CDRLS ECOSPWS Enclosure Air Force Essential Information ? ECOS Appendix L-01 ? Offeror Company Information Appendix L-02 ? Work Sample Cover Sheet Appendix L-03 ? ECOS Cross Reference Matrix Appendix L-04 ? Self Scoring Matrix Updated ? Locked Appendix L-05 ? Team Structure Format Appendix L-06 ? Community Involvement Examples ECOS Appendix_H_Sample_Subcontractor_or_Team_Member_Consent_LetterR_DFARS Full Text Clauses Attachment to ECOS Section I

SUBJECT Amendment 0003 to Solicitation FA890326R0007 Environmental Construction Optimization Services (ECOS) This follows Presolicitation notice FA890326R0007A, the Solicitation is posted as FA890326RA007. THE PURPOSE OF THIS AMENDMENT 0003 IS TO: 1. POST THE GOVERNMENT RESPONSES TO THE Q and A RECEIVED FROM PROSPECTIVE OFFERORS ON 1 JUNE 2026, ECOS INDUSTRY QUESTIONS. 2. UPDATE SECTION L (UPDATES/CHANGES IDENTIFIED IN YELLOW HIGHLIGHT FROM ORIGINAL). 3. UPDATE ATTACHMENTS TO SECTION L, APPENDIX L-01 OFFEROR COMPANY INFORMATION (UPDATES/CHANGES IDENTIFIED IN YELLOW HIGHLIGHT FROM ORIGINAL). THIS AMENDMENT EXTENDS THE PROPOSAL DUE DATE TO MONDAY, 13 JULY 2026 AT 14:00 CDT. 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. All communications related to this solicitation shall be submitted in writing to the Contracting Officer, Mr. Nathan J. Fry, 772d ESS/PKB at: 772ess.ecos.acqteam@us.af.mil Attachments: Attachment 1 ? ECOS PWS Final Attachment 2 ? ECOS [Reserved] Attachment 3 ? ECOS Section L Final Attachment 4 ? ECOS Section M Final Attachment 5 ? On and Off Ramping Procedures Final CDRL B003 DID Tailoring DI-MGMT-81861_AttachmentExhibit A ? CDRLS ECOS Exhibit B ? CDRLS ECOS Exhibit C ? CDRLS ECOSPWS Enclosure Air Force Essential Information ? ECOS Appendix L-01 ? Offeror Company Information Appendix L-02 ? Work Sample Cover Sheet Appendix L-03 ? ECOS Cross Reference Matrix Appendix L-04 ? Self Scoring Matrix Updated ? Locked Appendix L-05 ? Team Structure Format Appendix L-06 ? Community Involvement Examples ECOS Appendix_H_Sample_Subcontractor_or_Team_Member_Consent_LetterR_DFARS Full Text Clauses Attachment to ECOS Section I

SUBJECT Amendment 0002 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 THE PROPOSAL DUE DATE IS EXTENDED TO MONDAY 6 JULY 2026 AT 17:00 CDT, THE GOVERNMENT IS DRAFTING RESPONSES AND DOCUMENT UPDATS BASED UPON THE QUESTIONS RECEIVED FROM INTERESTED VDNDORS AND WILL BE POSTING A FURTHER AMENDMENT WITH THOSE UPDATES AND RESPONSES. 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 is posted, MONDAY 1 JUNE 2026 at 2:00PM Central Daylight Time is the deadline to submit questions. Any questions received after this cutoff time may not be answered. All questions related to this solicitation shall be submitted in writing to the Contracting Officer, Mr. Nathan J. Fry, 772d ESS/PKB at: 772ess.ecos.acqteam@us.af.mil Attachments: Attachment 1 ? ECOS PWS Final Attachment 2 ? ECOS [Reserved] Attachment 3 ? ECOS Section L Final Attachment 4 ? ECOS Section M Final Attachment 5 ? On and Off Ramping Procedures Final CDRL B003 DID Tailoring DI-MGMT-81861_AttachmentExhibit A ? CDRLS ECOS Exhibit B ? CDRLS ECOS Exhibit C ? CDRLS ECOSPWS Enclosure Air Force Essential Information ? ECOS Appendix L-01 ? Offeror Company Information Appendix L-02 ? Work Sample Cover Sheet Appendix L-03 ? ECOS Cross Reference Matrix Appendix L-04 ? Self Scoring Matrix Updated ? Locked Appendix L-05 ? Team Structure Format Appendix L-06 ? Community Involvement Examples ECOS Appendix_H_Sample_Subcontractor_or_Team_Member_Consent_LetterR_DFARS Full Text Clauses Attachment to ECOS Section I

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 is posted, MONDAY 1 JUNE 2026 at 2:00PM Central Daylight Time is the deadline to submit questions. Any questions received after this cutoff time may not be answered. All questions related to this solicitation shall be submitted in writing to the Contracting Officer, Mr. Nathan J. Fry, 772d ESS/PKB at: 772ess.ecos.acqteam@us.af.mil Attachments: Attachment 1 ? ECOS PWS Final Attachment 2 ? ECOS [Reserved] Attachment 3 ? ECOS Section L Final Attachment 4 ? ECOS Section M Final Attachment 5 ? On and Off Ramping Procedures Final CDRL B003 DID Tailoring DI-MGMT-81861_AttachmentExhibit A ? CDRLS ECOS Exhibit B ? CDRLS ECOS Exhibit C ? CDRLS ECOSPWS Enclosure Air Force Essential Information ? ECOS Appendix L-01 ? Offeror Company Information Appendix L-02 ? Work Sample Cover Sheet Appendix L-03 ? ECOS Cross Reference Matrix Appendix L-04 ? Self Scoring Matrix Updated ? Locked Appendix L-05 ? Team Structure Format Appendix L-06 ? Community Involvement Examples ECOS Appendix_H_Sample_Subcontractor_or_Team_Member_Consent_LetterR_DFARS Full Text Clauses Attachment to ECOS Section I

SUBJECT: Solicitation Notice; FA890326R0007 - Environmental Construction Optimization Services (ECOS) This follows Presolicitation notice FA890326R0007A, (This Solicitation is posting 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 (1) 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 is posted (Monday 1 July at 2:00PM Central Daylight Time) is the deadline to submit questions. Any questions received after this cutoff time may not be answered. All questions related to this solicitation in writing to the Contracting Officer, Mr. Nathan J. Fry, 772d ESS/PKB at: nathan.fry.7@us.af.mil and must be copied to the contract specialist(s) Mr. Alexander Casey 772d ESS/PKB at: alexander.casey@us.af.mil and Ms. Louwanna Wright 772d ESS/PKS at: louwanna.wright.1@us.af.mil Attachments:Attachment 1 ? ECOS PWS FinalAttachment 2 ? ECOS [Reserved]Attachment 3 ? ECOS Section L FinalAttachment 4 ? ECOS Section M FinalAttachment 5 ? On and Off Ramping Procedures FinalCDRL B003 DID Tailoring DI-MGMT-81861_AttachmentExhibit A ? CDRLS ECOSExhibit B ? CDRLS ECOSExhibit C ? CDRLS ECOSPWS Enclosure Air Force Essential Information ? ECOSAppendix L-01 ? Offeror Company InformationAppendix L-02 ? Work Sample Cover SheetAppendix L-03 ? ECOS Cross Reference MatrixAppendix L-04 ? Self Scoring Matrix Updated ? UnlockedAppendix L-05 ? Team Structure FormatAppendix L-06 ? Community Involvement ExamplesECOS Appendix_H_Sample_Subcontractor_or_Team_Member_Consent_LetterR_DFARS Full Text Clauses Attachment to ECOS Section I