Attachment 4: Phasing Plan
Updated
A PDF document (5.9 MB) attached to Building 215 Clean Room HEPA Filter Replacement, from the National Institute of Standards and Technology. Due Nov 2, 2026, 2:00 PM (UTC-5).
File name: Attachment 4 - Phasing Plan.pdf
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National Institute of Standard and Technology
Gaithersburg, MD, Building 215
Cleanroom Re-Balance Phasing
(100% Submission)
March 24, 2026
BKM No. 19146.02
Burdette, Koehler, Murphy and Associates, Inc.
6300 Blair Hill Lane, Suite 400 | Baltimore, MD 21209 | 410.323.0600 | bkma.com
NIST – Cleanroom Re-Balance Phasing
100% Submission
March 24, 2026
Page No. ii
Table of
Burdette, Koehler, Murphy and Associates, Inc.
Mechanical/Electrical Engineers
NIST – Rebalance Airflow in the Building 215 Cleanroom
100% Submission
March 24, 2026
Page No. 1
Overview
On June 29, 2021, Burdette, Koehler, Murphy, and Associates (BKM) issued construction documents to the National Institute of Standards and Technology (NIST) for the re-balancing of the Cleanrooms in Building 215. Although the design documents were completed and issued, funding for construction has not previously been released. The original intent assumed that the Cleanrooms could be shut down for an extended period and therefore did not include a construction phasing plan. However, NIST has since clarified that extended shutdowns are not permissible, and that construction must be phased to minimize disruption to ongoing Cleanroom operations. The purpose of this project is to develop a construction phasing plan to supplement the Cleanroom Re-Balance design documents.
Typical Galley
Typical Cleanroom
Burdette, Koehler, Murphy and Associates, Inc.
Mechanical/Electrical Engineers
NIST – Rebalance Airflow in the Building 215 Cleanroom
100% Submission
March 24, 2026
Page No. 2
Cleanroom Re-Balance Design Scope
The Cleanroom Re-Balance design documents for Building 215 include the following scope items, refer to the design documents dated June 29th, 2021, for more detailed information. 1. HEPA filters: New HEPA terminal filters & housing will be installed within the Class 100 and 1000 spaces to replace the existing original filters & housings. The existing original HEPAs are integral to the module and the entirety of the module will be replaced and reinstalled into the ceiling assembly. The contractor shall confirm during demolition if gasketing or gel assembly is used for the existing original HEPA filters. The gasketing or gel assembly shall be replaced or repaired to ensure proper sealing at ceiling assembly to maintain proper certification of each HEPA filter. The AHU HEPA filters in the recirculating and make-up air units are replaced under a normal preventative maintenance schedule and will be completed under regularly scheduled
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