Dugway Proving Ground Environmental Support / Central Hazardous Waste Services - RFP Amendment 0006 W911S626RA001

The Mission and Installation Contracting Command (MICC) - Dugway Proving Ground (DPG) has a requirement for comprehensive Environmental Support Services. The Contractor shall provide all personnel, equipment, supplies, facilities, transportation, tools, materials, and supervision necessary to operate the DPG Central Hazardous Waste Storage Facility (CHWSF) and manage hazardous, non-regulated, and decontaminated chemical agent-related waste streams. Additionally, the Contractor shall execute regulatory compliance support to ensure DPG operates in accordance with its RCRA Part B Permit, Clean Air Act (CAA) Title V Permit, and English Village Landfill Permit. Core tasks include, but are not limited to: CHWSF, SWMU, and HWMU operations and inspections. RCRA and CAA Technical Management and regulatory reporting. Groundwater Monitoring, sampling, and data validation. Underground Storage Tank (UST) and TSCA (Asbestos/Lead-Based Paint) compliance. Hazardous Waste Generator formal and informal training. ACQUISITION STRATEGY & SET-ASIDE This requirement is being solicited as a 100% Total Small Business Set-Aside utilizing commercial procedures under FAR Part 12 and negotiated procedures under FAR Part 15. NAICS Code: 562112 (Hazardous Waste Collection) Size Standard: $47.0 Million Contract Type: Single-Award, Firm-Fixed-Price (FFP) Period of Performance: One (1) month Phase-In, eleven (11) month Base Period, and four (4) 12-month Option Periods (Total duration not to exceed 66 months). Source Selection: Lowest Price Technically Acceptable (LPTA). SITE VISIT A site visit will be held at Dugway Proving Ground to allow offerors to inspect the CHWSF and general conditions. Date & Time: Monday, 4 May 2026 at 10:00 AM MDT RSVP Deadline: Offerors MUST register no later than 1:00 PM MDT on Wednesday, 29 April 2026. Registration: Email the Contract Specialist at amy.m.eilerts.civ@army.mil with the attendee s Full Name, Company, Phone, US Citizen (Y/N), DOB, Driver's License # and State, and whether they hold a current CAC. SOLICITATION INQUIRIES & QUESTIONS All questions regarding this solicitation must be submitted in writing to the Contract Specialist at amy.m.eilerts.civ@army.mil no later than 10:00 AM MDT on Monday, 11 May 2026. The Government will publish official responses via a solicitation amendment on SAM.gov. PROPOSAL SUBMISSION Proposals are due no later than 10:00 AM MDT on Tuesday, 26 May 2026. Proposals shall be submitted electronically via email to amy.m.eilerts.civ@army.mil in accordance with the Addendum to FAR 52.212-1 (Instructions to Offerors) contained in the solicitation. CYBERSECURITY REQUIREMENTS (CMMC & SPRS) This contract requires the handling of Controlled Unclassified Information (CUI). In accordance with DFARS 252.204-7021 and 252.240-7997, offerors must have a current NIST SP 800-171 Assessment score posted in the Supplier Performance Risk System (SPRS) and meet the requirements for Cybersecurity Maturity Model Certification (CMMC) prior to award. ATTACHMENTS The following documents are attached to this SAM.gov posting: Solicitation W911S626RA001 (SF 1449 and Full Clause Text) Performance Work Statement (PWS) Attachment 01: Price Proposal Spreadsheet Attachment 02: Past Performance References Attachment 03: Past Performance Questionnaire (PPQ) Attachment 04: DoL Wage Determination Technical Exhibits 1 - 5 (Facilities Map, 90-Day Sites, Training Matrix, Groundwater Wells, UST Asset List) ATOPSEC Requirements Local Site Information

AMENDMENT 0002 TO SOLICITATION W911S626RA001 The purpose of Amendment 0002 to the Environmental Support Services solicitation is to correct and replace the Past Performance Questionnaire attachment. 1. CHANGES TO SOLICITATION: Revised Attachment 03: The original "Attachment 03 - Past Performance Questionnaire" is hereby deleted in its entirety and replaced with "Revised Attachment 03 - Past Performance Questionnaire." The previous version contained administrative errors and non-applicable evaluation areas (e.g., software design, cost-reimbursement forecasting). The revised questionnaire has been tailored specifically to the Environmental Support Services Performance Work Statement (PWS) and the Lowest Price Technically Acceptable (LPTA) evaluation criteria. Note to Offerors: Please ensure your clients and references utilize the Revised Attachment 03 when submitting their evaluations directly to the Government. 2. ACTION REQUIRED: Offerors must acknowledge receipt of Amendment 0002 by completing, signing, and returning the Standard Form 30 (SF 30) with their final proposal submission. 3. DEADLINES: All solicitation deadlines remain unchanged. Questions Due: 10:00 AM MDT on Monday, 11 May 2026. Proposals Due: 10:00 AM MDT on Tuesday, 26 May 2026. ATTACHMENTS INCLUDED IN THIS AMENDMENT: SF 30 - Amendment 0002 Revised Attachment 03 - Past Performance Questionnaire (PPQ) AMENDMENT 0001 TO SOLICITATION W911S626RA001 The purpose of Amendment 0001 to the Environmental Support Services solicitation is to update facility and utility requirements. 1. CHANGES TO SOLICITATION: Revised PWS: Performance Work Statement (PWS) Sections 3.2 (Facilities) and 3.3 (Utilities) have been updated to clarify that the Contractor is required to provide their own temporary office facilities. The Government will continue to provide the 90-day hazardous waste storage site and the operational footprint. Revised Technical Exhibit 1: The "Facilities Map" has been replaced to clearly distinguish between Government-owned structures and Contractor-furnished office spaces. 2. QUESTIONS AND ANSWERS (Q&A): The Government is currently collecting industry questions. A comprehensive Q&A document will be published via a subsequent amendment after the question submission deadline has passed (10:00 AM MDT on 11 May 2026). 3. ACTION REQUIRED: Offerors must acknowledge receipt of Amendment 0001 by completing, signing, and returning the Standard Form 30 (SF 30) with their final proposal submission. 4. DEADLINES: The proposal due date remains unchanged. Proposals are due no later than 10:00 AM MDT on Tuesday, 26 May 2026. ATTACHMENTS INCLUDED IN THIS AMENDMENT: SF 30 - Amendment 0001 Revised Performance Work Statement (PWS) Revised Technical Exhibit 1 - Facilities Map ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- The Mission and Installation Contracting Command (MICC) - Dugway Proving Ground (DPG) has a requirement for comprehensive Environmental Support Services. The Contractor shall provide all personnel, equipment, supplies, facilities, transportation, tools, materials, and supervision necessary to operate the DPG Central Hazardous Waste Storage Facility (CHWSF) and manage hazardous, non-regulated, and decontaminated chemical agent-related waste streams. Additionally, the Contractor shall execute regulatory compliance support to ensure DPG operates in accordance with its RCRA Part B Permit, Clean Air Act (CAA) Title V Permit, and English Village Landfill Permit. Core tasks include, but are not limited to: CHWSF, SWMU, and HWMU operations and inspections. RCRA and CAA Technical Management and regulatory reporting. Groundwater Monitoring, sampling, and data validation. Underground Storage Tank (UST) and TSCA (Asbestos/Lead-Based Paint) compliance. Hazardous Waste Generator formal and informal training. ACQUISITION STRATEGY & SET-ASIDE This requirement is being solicited as a 100% Total Small Business Set-Aside utilizing commercial procedures under FAR Part 12 and negotiated procedures under FAR Part 15. NAICS Code: 562112 (Hazardous Waste Collection) Size Standard: $47.0 Million Contract Type: Single-Award, Firm-Fixed-Price (FFP) Period of Performance: One (1) month Phase-In, eleven (11) month Base Period, and four (4) 12-month Option Periods (Total duration not to exceed 66 months). Source Selection: Lowest Price Technically Acceptable (LPTA). SITE VISIT A site visit will be held at Dugway Proving Ground to allow offerors to inspect the CHWSF and general conditions. Date & Time: Monday, 4 May 2026 at 10:00 AM MDT RSVP Deadline: Offerors MUST register no later than 1:00 PM MDT on Wednesday, 29 April 2026. Registration: Email the Contract Specialist at amy.m.eilerts.civ@army.mil with the attendee s Full Name, Company, Phone, US Citizen (Y/N), DOB, Driver's License # and State, and whether they hold a current CAC. SOLICITATION INQUIRIES & QUESTIONS All questions regarding this solicitation must be submitted in writing to the Contract Specialist at amy.m.eilerts.civ@army.mil no later than 10:00 AM MDT on Monday, 11 May 2026. The Government will publish official responses via a solicitation amendment on SAM.gov. PROPOSAL SUBMISSION Proposals are due no later than 10:00 AM MDT on Tuesday, 26 May 2026. Proposals shall be submitted electronically via email to amy.m.eilerts.civ@army.mil in accordance with the Addendum to FAR 52.212-1 (Instructions to Offerors) contained in the solicitation. CYBERSECURITY REQUIREMENTS (CMMC & SPRS) This contract requires the handling of Controlled Unclassified Information (CUI). In accordance with DFARS 252.204-7021 and 252.240-7997, offerors must have a current NIST SP 800-171 Assessment score posted in the Supplier Performance Risk System (SPRS) and meet the requirements for Cybersecurity Maturity Model Certification (CMMC) prior to award. ATTACHMENTS The following documents are attached to this SAM.gov posting: Solicitation W911S626RA001 (SF 1449 and Full Clause Text) Performance Work Statement (PWS) Attachment 01: Price Proposal Spreadsheet Attachment 02: Past Performance References Attachment 03: Past Performance Questionnaire (PPQ) Attachment 04: DoL Wage Determination Technical Exhibits 1 - 5 (Facilities Map, 90-Day Sites, Training Matrix, Groundwater Wells, UST Asset List) ATOPSEC Requirements Local Site Information

Amendment 0004 - Solicitation W911S626RA001 (Environmental Support Services - DPG) Description: The purpose of Amendment 0004 to Solicitation W911S626RA001 is to extend the proposal due date, formally incorporate mandatory cybersecurity clauses, add required Technical Exhibits, and provide responses to a portion of the industry questions received to date. Summary of Changes in Amendment 0004: Proposal Due Date: Extended to 15 June 2026 at 10:00 AM MDT Q&A Status: Added "Questions and Answers V2" containing responses to a subset of industry questions. Note: Additional questions remain in review. Cybersecurity Clauses: Formally incorporated FAR 52.240-93, DFARS 252.204-7012, 252.204-7021 (Level 2 Self), 252.204-7025 (Level 2 Self), and 252.240-7997. Technical Exhibits Added: Added TE-6 (Containers), TE-7 (90-Day Sites), and TE-8 (Title V Sources). Volume Page Limits: Volume I increased to 25 pages; Volume II increased to 35 pages. Submission Format: Clarified that all pricing data must be submitted within the single PDF for Volume I. Separate Excel files are not required. Quality Control Plan: Clarified that a full QCP is a post-award deliverable and is not required for proposal submission. Please review all attached documents carefully. Offerors must acknowledge receipt of all amendments by signing and returning page 1 of all SF 30s with their proposal submission. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Amendment 0003 - Environmental Support Services - W911S6-26-R-A001 Description: The purpose of Amendment 0003 to Solicitation W911S6-26-R-A001 is to extend the deadline for receipt of questions, provide Government responses to industry questions, update the Performance Work Statement (PWS) and Evaluation Criteria, incorporate new regulatory clauses, and attach additional documentation. Specifically, this amendment accomplishes the following: Extension of Question Deadline: The deadline for receipt of questions is extended from Monday, May 11, 2026, to Wednesday, May 13, 2026, at 10:00 AM MDT. Key Personnel Clarification: Updates PWS Sections 1.6.10 and 1.6.10.1 to explicitly clarify the qualification requirements for the Alternate Project/Site Manager position and updates the corresponding evaluation criteria in the Addendum to FAR 52.212-2. PWS and PRS Corrections: Incorporates the previously omitted PWS Section 5.10 (DTTF Inspection) and corrects the subsequent numbering and alignment discrepancies in PWS Sections 5.18 through 5.22 and the corresponding Performance Requirements Summary (PRS) matrix. PWS Air Program Updates: Updates the Clean Air Act (CAA) Technical Management section (PWS 5.16) to include preparation/revisions to the Dugway Title V Permit and Approval Order, and adds the requirement to gather periodic reporting from data calls for all Dugway and tenant activities for emission calculations. New Regulatory Requirement: Incorporates FAR Clause 52.222-90, Addressing DEI Discrimination by Federal Contractors, in accordance with Executive Order 14398. Q&A Incorporation: Attaches the formal Government responses to industry questions submitted to date during the solicitation Q&A period. Site Visit Documentation: Attaches the official Site Visit Presentation Slides and the Site Visit Attendee Roster. Cybersecurity Documentation: Attaches a new reference sheet outlining CMMC/Cybersecurity requirements for the contract. ADMINISTRATIVE NOTE REGARDING CLAUSES: Due to a technical error in the contract writing system, FAR Clause 52.203-6 (Alternate I) and FAR Clause 52.224-3 (Alternate I) are showing as "deleted" in the Contract Clauses section of the SF 30 document. This is a system error. These clauses are still applicable to this acquisition, remain in full force and effect, and will be incorporated into the final contract award. ACTION REQUIRED: Offerors must acknowledge receipt of all amendments to this solicitation by signing and returning the associated Standard Form 30s (SF 30) with their proposal submission, prior to the hour and date specified for receipt of offers. Failure to acknowledge all amendments may result in a proposal being determined unacceptable. All other terms, conditions, and the proposal due date remain unchanged. Attachments Added/Updated via Amendment 0003: SF 30 - Amendment 0003 RFQ W911S626RA001 Amendment 0003 Attachment - PWS ENV Support DPG - Amendment 0003 5-7-26 Attachment - Questions and Answers - V1 5-7-26 Attachment - Site Visit Slides 5-4-26 Attachment - Site Visit Roster 5-4-2026 Attachment - Cybersecurity Compliance Requirements AMENDMENT 0002 TO SOLICITATION W911S626RA001 The purpose of Amendment 0002 to the Environmental Support Services solicitation is to correct and replace the Past Performance Questionnaire attachment. 1. CHANGES TO SOLICITATION: Revised Attachment 03: The original "Attachment 03 - Past Performance Questionnaire" is hereby deleted in its entirety and replaced with "Revised Attachment 03 - Past Performance Questionnaire." The previous version contained administrative errors and non-applicable evaluation areas (e.g., software design, cost-reimbursement forecasting). The revised questionnaire has been tailored specifically to the Environmental Support Services Performance Work Statement (PWS) and the Lowest Price Technically Acceptable (LPTA) evaluation criteria. Note to Offerors: Please ensure your clients and references utilize the Revised Attachment 03 when submitting their evaluations directly to the Government. 2. ACTION REQUIRED: Offerors must acknowledge receipt of Amendment 0002 by completing, signing, and returning the Standard Form 30 (SF 30) with their final proposal submission. 3. DEADLINES: All solicitation deadlines remain unchanged. Questions Due: 10:00 AM MDT on Monday, 11 May 2026. Proposals Due: 10:00 AM MDT on Tuesday, 26 May 2026. ATTACHMENTS INCLUDED IN THIS AMENDMENT: SF 30 - Amendment 0002 Revised Attachment 03 - Past Performance Questionnaire (PPQ) AMENDMENT 0001 TO SOLICITATION W911S626RA001 The purpose of Amendment 0001 to the Environmental Support Services solicitation is to update facility and utility requirements. 1. CHANGES TO SOLICITATION: Revised PWS: Performance Work Statement (PWS) Sections 3.2 (Facilities) and 3.3 (Utilities) have been updated to clarify that the Contractor is required to provide their own temporary office facilities. The Government will continue to provide the 90-day hazardous waste storage site and the operational footprint. Revised Technical Exhibit 1: The "Facilities Map" has been replaced to clearly distinguish between Government-owned structures and Contractor-furnished office spaces. 2. QUESTIONS AND ANSWERS (Q&A): The Government is currently collecting industry questions. A comprehensive Q&A document will be published via a subsequent amendment after the question submission deadline has passed (10:00 AM MDT on 11 May 2026). 3. ACTION REQUIRED: Offerors must acknowledge receipt of Amendment 0001 by completing, signing, and returning the Standard Form 30 (SF 30) with their final proposal submission. 4. DEADLINES: The proposal due date remains unchanged. Proposals are due no later than 10:00 AM MDT on Tuesday, 26 May 2026. ATTACHMENTS INCLUDED IN THIS AMENDMENT: SF 30 - Amendment 0001 Revised Performance Work Statement (PWS) Revised Technical Exhibit 1 - Facilities Map ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- The Mission and Installation Contracting Command (MICC) - Dugway Proving Ground (DPG) has a requirement for comprehensive Environmental Support Services. The Contractor shall provide all personnel, equipment, supplies, facilities, transportation, tools, materials, and supervision necessary to operate the DPG Central Hazardous Waste Storage Facility (CHWSF) and manage hazardous, non-regulated, and decontaminated chemical agent-related waste streams. Additionally, the Contractor shall execute regulatory compliance support to ensure DPG operates in accordance with its RCRA Part B Permit, Clean Air Act (CAA) Title V Permit, and English Village Landfill Permit. Core tasks include, but are not limited to: CHWSF, SWMU, and HWMU operations and inspections. RCRA and CAA Technical Management and regulatory reporting. Groundwater Monitoring, sampling, and data validation. Underground Storage Tank (UST) and TSCA (Asbestos/Lead-Based Paint) compliance. Hazardous Waste Generator formal and informal training. ACQUISITION STRATEGY & SET-ASIDE This requirement is being solicited as a 100% Total Small Business Set-Aside utilizing commercial procedures under FAR Part 12 and negotiated procedures under FAR Part 15. NAICS Code: 562112 (Hazardous Waste Collection) Size Standard: $47.0 Million Contract Type: Single-Award, Firm-Fixed-Price (FFP) Period of Performance: One (1) month Phase-In, eleven (11) month Base Period, and four (4) 12-month Option Periods (Total duration not to exceed 66 months). Source Selection: Lowest Price Technically Acceptable (LPTA). SITE VISIT A site visit will be held at Dugway Proving Ground to allow offerors to inspect the CHWSF and general conditions. Date & Time: Monday, 4 May 2026 at 10:00 AM MDT RSVP Deadline: Offerors MUST register no later than 1:00 PM MDT on Wednesday, 29 April 2026. Registration: Email the Contract Specialist at amy.m.eilerts.civ@army.mil with the attendee s Full Name, Company, Phone, US Citizen (Y/N), DOB, Driver's License # and State, and whether they hold a current CAC. SOLICITATION INQUIRIES & QUESTIONS All questions regarding this solicitation must be submitted in writing to the Contract Specialist at amy.m.eilerts.civ@army.mil no later than 10:00 AM MDT on Monday, 11 May 2026. The Government will publish official responses via a solicitation amendment on SAM.gov. PROPOSAL SUBMISSION Proposals are due no later than 10:00 AM MDT on Tuesday, 26 May 2026. Proposals shall be submitted electronically via email to amy.m.eilerts.civ@army.mil in accordance with the Addendum to FAR 52.212-1 (Instructions to Offerors) contained in the solicitation. CYBERSECURITY REQUIREMENTS (CMMC & SPRS) This contract requires the handling of Controlled Unclassified Information (CUI). In accordance with DFARS 252.204-7021 and 252.240-7997, offerors must have a current NIST SP 800-171 Assessment score posted in the Supplier Performance Risk System (SPRS) and meet the requirements for Cybersecurity Maturity Model Certification (CMMC) prior to award. ATTACHMENTS The following documents are attached to this SAM.gov posting: Solicitation W911S626RA001 (SF 1449 and Full Clause Text) Performance Work Statement (PWS) Attachment 01: Price Proposal Spreadsheet Attachment 02: Past Performance References Attachment 03: Past Performance Questionnaire (PPQ) Attachment 04: DoL Wage Determination Technical Exhibits 1 - 5 (Facilities Map, 90-Day Sites, Training Matrix, Groundwater Wells, UST Asset List) ATOPSEC Requirements Local Site Information

AMENDMENT 0005 - Solicitation W911S626RA001 (Environmental Support Services - DPG) Description of Amendment 0005: The purpose of Amendment 0005 is to provide final Government responses to industry questions, update proposal instructions, establish final cybersecurity evaluation criteria, and provide updated attachments. Q&A Incorporation: Attaches the final, consolidated Questions and Answers document (Questions 1-48). This document establishes firm pricing baselines for TSCA and UST requirements and clarifies CMMC 2.0 compliance expectations. Updates to Instructions to Offerors (Addendum to FAR 52.212-1): Page Limits: Clarifies that Key Personnel resumes are included in the Volume II page count, whereas signed Letters of Commitment are excluded. Price Proposal: Incorporates a labor rate breakdown for TSCA Technical Writing Support (0.25 FTE) in the newly added Table 3 of the pricing spreadsheet. Cybersecurity: Requires the submission of 10-digit CMMC Unique Identifiers (UIDs) and a verbatim CMMC affirmation statement in Volume I. Updates to Evaluation Criteria (Addendum to FAR 52.212-2): Removes Cybersecurity/CUI Protection as a Mission Capability technical sub-factor (former Sub-factor 8). Establishes CMMC 2.0 compliance as a strict Pre-Award Responsibility and Eligibility Requirement, outlining the specific SPRS scoring threshold (minimum 0.8 ratio) required to achieve a valid "Conditional" or "Final" status prior to award. Attachment Updates: Replaces the Price Proposal Spreadsheet and the Cybersecurity Compliance Requirements attachment with updated versions. ADMINISTRATIVE NOTE REGARDING PROPOSAL SUBMISSION: All pricing data shall be entered exclusively on the Price Proposal Spreadsheet (Attachment 01). Offerors are not required to enter pricing on the continuation pages (pages 2 to 7) of the SF 1449. To satisfy administrative submission requirements, offerors only need to submit a signed Page 1 of the SF 1449 and a signed Page 1 of all SF 30 Amendments. ACTION REQUIRED: Offerors must acknowledge receipt of all amendments by signing and returning Page 1 of the associated Standard Form 30s (SF 30) with their proposal submission. The deadline for receipt of proposals is Monday, June 15, 2026, at 10:00 AM MDT. All other terms and conditions remain unchanged. SUMMARY OF PREVIOUS AMENDMENTS: Amendment 0004: Extended proposal due date to June 15, 2026. Formally incorporated FAR 52.240-93 and DFARS 252.204-7012, 7021, 7025, and 7997. Added Technical Exhibits 6, 7, and 8. Increased Volume I limit to 25 pages and Volume II to 35 pages. Clarified that a full Quality Control Plan is a post-award deliverable. Amendment 0003: Extended Q&A deadline. Clarified Key Personnel qualifications for Alternate Project Manager. Corrected PWS numbering (re-inserted PWS 5.10). Updated PWS 5.16 for Title V compliance. Incorporated FAR 52.222-90 (DEI Discrimination). Added Site Visit slides and roster. (Note: System error deleted 52.203-6 and 52.224-3; these remain applicable and will be in final award). Amendment 0002: Replaced Attachment 03 (Past Performance Questionnaire) with a revised version tailored to Environmental Services. Amendment 0001: Updated PWS Sections 3.2 and 3.3 and TE-1 to clarify Contractor is required to provide temporary office facilities. BASE SOLICITATION OVERVIEW: The Mission and Installation Contracting Command (MICC) - Dugway Proving Ground (DPG) has a requirement for comprehensive Environmental Support Services. The Contractor shall provide all personnel, equipment, supplies, facilities, transportation, tools, materials, and supervision necessary to operate the DPG Central Hazardous Waste Storage Facility (CHWSF) and manage hazardous, non-regulated, and decontaminated chemical agent-related waste streams. Additionally, the Contractor shall execute regulatory compliance support to ensure DPG operates in accordance with its RCRA Part B Permit, Clean Air Act (CAA) Title V Permit, and English Village Landfill Permit. ACQUISITION STRATEGY & SET-ASIDE This requirement is being solicited as a 100% Total Small Business Set-Aside utilizing commercial procedures under FAR Part 12 and negotiated procedures under FAR Part 15. NAICS Code: 562112 (Hazardous Waste Collection) Size Standard: $47.0 Million Contract Type: Single-Award, Firm-Fixed-Price (FFP) Period of Performance: One (1) month Phase-In, eleven (11) month Base Period, and four (4) 12-month Option Periods. Source Selection: Lowest Price Technically Acceptable (LPTA). PROPOSAL SUBMISSION DEADLINE Proposals are due no later than 10:00 AM MDT on Monday, 15 June 2026. Proposals shall be submitted electronically via email to amy.m.eilerts.civ@army.mil in accordance with the Addendum to FAR 52.212-1 (Instructions to Offerors) contained in the solicitation. CYBERSECURITY REQUIREMENTS (CMMC & SPRS) This contract requires the handling of Controlled Unclassified Information (CUI). In accordance with DFARS 252.204-7021 and 252.204-7025, offerors must have a valid CMMC Level 2 (Self) status posted in the Supplier Performance Risk System (SPRS) prior to award. See Amendment 0005 attachments for full details.

DESCRIPTION OF AMENDMENT 0006: The purpose of Amendment 0006 is to provide a final administrative clarification regarding Key Personnel staffing flexibility in response to industry inquiries. Questions & Answers (Q&A) Update: Consolidated Q and A - Final - Revised - Amendment 0006 to incorporate one final clarification (Question 49). PROPOSAL SUBMISSION DEADLINE: The deadline for receipt of proposals remains unchanged and is Monday, June 15, 2026, at 10:00 AM MDT. ACTION REQUIRED: Offerors must acknowledge receipt of all amendments (including Amendment 0006) by signing and returning Page 1 of the Standard Form 30 (SF 30) with their proposal submission. All other terms, conditions, and attachments remain unchanged. AMENDMENT 0005 - Solicitation W911S626RA001 (Environmental Support Services - DPG) Description of Amendment 0005: The purpose of Amendment 0005 is to provide final Government responses to industry questions, update proposal instructions, establish final cybersecurity evaluation criteria, and provide updated attachments. Q&A Incorporation: Attaches the final, consolidated Questions and Answers document (Questions 1-48). This document establishes firm pricing baselines for TSCA and UST requirements and clarifies CMMC 2.0 compliance expectations. Updates to Instructions to Offerors (Addendum to FAR 52.212-1): Page Limits: Clarifies that Key Personnel resumes are included in the Volume II page count, whereas signed Letters of Commitment are excluded. Price Proposal: Incorporates a labor rate breakdown for TSCA Technical Writing Support (0.25 FTE) in the newly added Table 3 of the pricing spreadsheet. Cybersecurity: Requires the submission of 10-digit CMMC Unique Identifiers (UIDs) and a verbatim CMMC affirmation statement in Volume I. Updates to Evaluation Criteria (Addendum to FAR 52.212-2): Removes Cybersecurity/CUI Protection as a Mission Capability technical sub-factor (former Sub-factor 8). Establishes CMMC 2.0 compliance as a strict Pre-Award Responsibility and Eligibility Requirement, outlining the specific SPRS scoring threshold (minimum 0.8 ratio) required to achieve a valid "Conditional" or "Final" status prior to award. Attachment Updates: Replaces the Price Proposal Spreadsheet and the Cybersecurity Compliance Requirements attachment with updated versions. ADMINISTRATIVE NOTE REGARDING PROPOSAL SUBMISSION: All pricing data shall be entered exclusively on the Price Proposal Spreadsheet (Attachment 01). Offerors are not required to enter pricing on the continuation pages (pages 2 to 7) of the SF 1449. To satisfy administrative submission requirements, offerors only need to submit a signed Page 1 of the SF 1449 and a signed Page 1 of all SF 30 Amendments. ACTION REQUIRED: Offerors must acknowledge receipt of all amendments by signing and returning Page 1 of the associated Standard Form 30s (SF 30) with their proposal submission. The deadline for receipt of proposals is Monday, June 15, 2026, at 10:00 AM MDT. All other terms and conditions remain unchanged. SUMMARY OF PREVIOUS AMENDMENTS: Amendment 0004: Extended proposal due date to June 15, 2026. Formally incorporated FAR 52.240-93 and DFARS 252.204-7012, 7021, 7025, and 7997. Added Technical Exhibits 6, 7, and 8. Increased Volume I limit to 25 pages and Volume II to 35 pages. Clarified that a full Quality Control Plan is a post-award deliverable. Amendment 0003: Extended Q&A deadline. Clarified Key Personnel qualifications for Alternate Project Manager. Corrected PWS numbering (re-inserted PWS 5.10). Updated PWS 5.16 for Title V compliance. Incorporated FAR 52.222-90 (DEI Discrimination). Added Site Visit slides and roster. (Note: System error deleted 52.203-6 and 52.224-3; these remain applicable and will be in final award). Amendment 0002: Replaced Attachment 03 (Past Performance Questionnaire) with a revised version tailored to Environmental Services. Amendment 0001: Updated PWS Sections 3.2 and 3.3 and TE-1 to clarify Contractor is required to provide temporary office facilities. BASE SOLICITATION OVERVIEW: The Mission and Installation Contracting Command (MICC) - Dugway Proving Ground (DPG) has a requirement for comprehensive Environmental Support Services. The Contractor shall provide all personnel, equipment, supplies, facilities, transportation, tools, materials, and supervision necessary to operate the DPG Central Hazardous Waste Storage Facility (CHWSF) and manage hazardous, non-regulated, and decontaminated chemical agent-related waste streams. Additionally, the Contractor shall execute regulatory compliance support to ensure DPG operates in accordance with its RCRA Part B Permit, Clean Air Act (CAA) Title V Permit, and English Village Landfill Permit. ACQUISITION STRATEGY & SET-ASIDE This requirement is being solicited as a 100% Total Small Business Set-Aside utilizing commercial procedures under FAR Part 12 and negotiated procedures under FAR Part 15. NAICS Code: 562112 (Hazardous Waste Collection) Size Standard: $47.0 Million Contract Type: Single-Award, Firm-Fixed-Price (FFP) Period of Performance: One (1) month Phase-In, eleven (11) month Base Period, and four (4) 12-month Option Periods. Source Selection: Lowest Price Technically Acceptable (LPTA). PROPOSAL SUBMISSION DEADLINE Proposals are due no later than 10:00 AM MDT on Monday, 15 June 2026. Proposals shall be submitted electronically via email to amy.m.eilerts.civ@army.mil in accordance with the Addendum to FAR 52.212-1 (Instructions to Offerors) contained in the solicitation. CYBERSECURITY REQUIREMENTS (CMMC & SPRS) This contract requires the handling of Controlled Unclassified Information (CUI). In accordance with DFARS 252.204-7021 and 252.204-7025, offerors must have a valid CMMC Level 2 (Self) status posted in the Supplier Performance Risk System (SPRS) prior to award. See Amendment 0005 attachments for full details.

The Mission and Installation Contracting Command (MICC) Dugway Proving Ground has awarded a Firm-Fixed-Price contract to Mellor Engineering, Inc. for comprehensive Environmental Support Services. The contractor will provide all personnel, equipment, and services necessary to operate and maintain the Central Hazardous Waste Storage Facility (CHWSF) and manage associated waste streams. The contract was awarded competitively in accordance with FAR Part 15 and FAR Part 12 utilizing Lowest Price Technically Acceptable (LPTA) source selection procedures.