REQUEST FOR PROPOSAL; HMIS RFP # 382436 - EXTERNAL CPA FIRM; ADDENDUM 01 382436

Intent to Bid: 11/05/2025 Pre-Tender Queries/Questions Due: 11/06/2025, 10:00 AM PST RESPONSE TO PRE-TENDER QUERIES POSTED AS ADDENDUM 01 (11/06/2025) Hanford Mission Integration Solutions, LLC. (hereby HMIS, Contractor or Buyer ) acting under its contract with the U.S. Department of Energy Richland Operations Office (DOE-RL) located in Richland, WA, requests Offeror to submit a proposal for Blanket Master Agreement- Labor Hour a type of subcontract to provide Subcontractor Pre-Award Proposal Audit and Accounting System Audit. The Subcontractor shall be a licensed Certified Public Accounting (CPA) Firm with experience (a minimum of two) performing Accounting System Reviews in accordance with Generally Accepted Government Auditing Standards (GAGAS). Subcontractor 1) shall have passed an external QA Review performed by an external firm as required by GAGAS standards within the last three years, or 2) if the Subcontractor is a new entity, shall schedule a QA Review within three years of its incorporation. The Subcontractor is expected to provide appropriately trained and experienced staff to perform the work specified. Task specific or unique training or qualifications required for this task includes knowledge of GAGAS Standards, Subcontractor personnel shall have: Bachelor s degree with a minimum of five (5) years auditing experience, including GAGAS experience. An audit related certification such as CPA (preferred), Certified Fraud Examiner, Certified Internal Auditor, Certified Information System Auditor and Certified Government Financial Manager, but not limited to the list. Evidence of current certifications must be submitted with resumes. A minimum of two (2) personnel, meeting the aforementioned criteria, must be approved by HMIS prior to award. At minimum, the staffing requirements are: 1. Supervisory Roles (1 minimum) 2. Auditors (1 minimum)

Intent to Bid: 11/05/2025 Pre-Tender Queries/Questions Due: 11/06/2025, 10:00 AM PST RESPONSE TO PRE-TENDER QUERIES POSTED AS ADDENDUM 01 (11/06/2025) FURTHER RESPONSES TO PRE-TENDER QUERIES POSTED AS ADDENDUM 02 (11/12/2025) Hanford Mission Integration Solutions, LLC. (hereby HMIS, Contractor or Buyer ) acting under its contract with the U.S. Department of Energy Richland Operations Office (DOE-RL) located in Richland, WA, requests Offeror to submit a proposal for Blanket Master Agreement- Labor Hour a type of subcontract to provide Subcontractor Pre-Award Proposal Audit and Accounting System Audit. The Subcontractor shall be a licensed Certified Public Accounting (CPA) Firm with experience (a minimum of two) performing Accounting System Reviews in accordance with Generally Accepted Government Auditing Standards (GAGAS). Subcontractor 1) shall have passed an external QA Review performed by an external firm as required by GAGAS standards within the last three years, or 2) if the Subcontractor is a new entity, shall schedule a QA Review within three years of its incorporation. The Subcontractor is expected to provide appropriately trained and experienced staff to perform the work specified. Task specific or unique training or qualifications required for this task includes knowledge of GAGAS Standards, Subcontractor personnel shall have: Bachelor s degree with a minimum of five (5) years auditing experience, including GAGAS experience. An audit related certification such as CPA (preferred), Certified Fraud Examiner, Certified Internal Auditor, Certified Information System Auditor and Certified Government Financial Manager, but not limited to the list. Evidence of current certifications must be submitted with resumes. A minimum of two (2) personnel, meeting the aforementioned criteria, must be approved by HMIS prior to award. At minimum, the staffing requirements are: 1. Supervisory Roles (1 minimum) 2. Auditors (1 minimum)

Intent to Bid: 11/05/2025 Pre-Tender Queries/Questions Due: 11/06/2025, 10:00 AM PST RESPONSE TO PRE-TENDER QUERIES POSTED AS ADDENDUM 01 (11/06/2025) FURTHER RESPONSES TO PRE-TENDER QUERIES POSTED AS ADDENDUM 02 (11/12/2025) EXTENSION OF PROPOSAL SUBMITTAL TO 11/24/2025; 10AM PST; ADDENDUM 03 (11/17/2025) Hanford Mission Integration Solutions, LLC. (hereby HMIS, Contractor or Buyer ) acting under its contract with the U.S. Department of Energy Richland Operations Office (DOE-RL) located in Richland, WA, requests Offeror to submit a proposal for Blanket Master Agreement- Labor Hour a type of subcontract to provide Subcontractor Pre-Award Proposal Audit and Accounting System Audit. The Subcontractor shall be a licensed Certified Public Accounting (CPA) Firm with experience (a minimum of two) performing Accounting System Reviews in accordance with Generally Accepted Government Auditing Standards (GAGAS). Subcontractor 1) shall have passed an external QA Review performed by an external firm as required by GAGAS standards within the last three years, or 2) if the Subcontractor is a new entity, shall schedule a QA Review within three years of its incorporation. The Subcontractor is expected to provide appropriately trained and experienced staff to perform the work specified. Task specific or unique training or qualifications required for this task includes knowledge of GAGAS Standards, Subcontractor personnel shall have: Bachelor s degree with a minimum of five (5) years auditing experience, including GAGAS experience. An audit related certification such as CPA (preferred), Certified Fraud Examiner, Certified Internal Auditor, Certified Information System Auditor and Certified Government Financial Manager, but not limited to the list. Evidence of current certifications must be submitted with resumes. A minimum of two (2) personnel, meeting the aforementioned criteria, must be approved by HMIS prior to award. At minimum, the staffing requirements are: 1. Supervisory Roles (1 minimum) 2. Auditors (1 minimum)

Intent to Bid: 11/05/2025 Pre-Tender Queries/Questions Due: 11/06/2025, 10:00 AM PST RESPONSE TO PRE-TENDER QUERIES POSTED AS ADDENDUM 01 (11/06/2025) FURTHER RESPONSES TO PRE-TENDER QUERIES POSTED AS ADDENDUM 02 (11/12/2025) EXTENSION OF PROPOSAL SUBMITTAL TO 11/24/2025; 10AM PST; ADDENDUM 03 (11/17/2025) FURTHER RESPONE TO QUESTIONS POSTED AS ADDENDUM 04 (11/20/2025) Hanford Mission Integration Solutions, LLC. (hereby HMIS, Contractor or Buyer ) acting under its contract with the U.S. Department of Energy Richland Operations Office (DOE-RL) located in Richland, WA, requests Offeror to submit a proposal for Blanket Master Agreement- Labor Hour a type of subcontract to provide Subcontractor Pre-Award Proposal Audit and Accounting System Audit. The Subcontractor shall be a licensed Certified Public Accounting (CPA) Firm with experience (a minimum of two) performing Accounting System Reviews in accordance with Generally Accepted Government Auditing Standards (GAGAS). Subcontractor 1) shall have passed an external QA Review performed by an external firm as required by GAGAS standards within the last three years, or 2) if the Subcontractor is a new entity, shall schedule a QA Review within three years of its incorporation. The Subcontractor is expected to provide appropriately trained and experienced staff to perform the work specified. Task specific or unique training or qualifications required for this task includes knowledge of GAGAS Standards, Subcontractor personnel shall have: Bachelor s degree with a minimum of five (5) years auditing experience, including GAGAS experience. An audit related certification such as CPA (preferred), Certified Fraud Examiner, Certified Internal Auditor, Certified Information System Auditor and Certified Government Financial Manager, but not limited to the list. Evidence of current certifications must be submitted with resumes. A minimum of two (2) personnel, meeting the aforementioned criteria, must be approved by HMIS prior to award. At minimum, the staffing requirements are: 1. Supervisory Roles (1 minimum) 2. Auditors (1 minimum)