Addendum 01 - Memorandum.pdf
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- 36C77626B0024
About this file
This is an addendum to a Department of Veterans Affairs construction contract for the Upgrade Chiller Plant project (632-25-101), issued on September 14, 2026, by Steven Green, COR, to contracting personnel Bridget May and Thomas Council.
The addendum clarifies equipment requirements for Medical Gas Equipment and modifies the cooling system serving the Medical Gas Room. Key modifications include the addition of a new air handler unit (AH-1) to replace existing split system equipment (FCU-1 and ACC-1), expansion of the floor slab to accommodate the new cooling system, and installation of equipment housekeeping pads for the AH-1 unit and relocated condenser unit (ACC). Construction modifications span multiple drawings and specifications: architectural plans (A-112, A-114, A-115, A-301, SB-101) address excavation, floor slab expansion, and reflected ceiling coordination; mechanical plans (M-111, M-114, M-118, M-503, M-601, M-602, M-605, P-121, P-601) show new chilled water connections (2-1/2" supply and return to existing 12" system), air handler piping details, equipment schedules, and control diagrams; electrical plans (E-001, E-121, E-703) update equipment connections and panel scheduling; and fire alarm plan (FA-121) incorporates AH-1 duct detectors and fan shutdown relay. The modifications also include new floor drainage for AH-1 condensate and updated schedules for Medical Vacuum (MV-1) and Medical Air (MA-1) systems.
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Department of Veterans Affairs Memorandum
Date: Monday, September 14, 2026
From: Steven Green, COR
Subj: Addendum #01
Project Title: Upgrade Chiller Plant Project: 632-25-101
To: Bridget May, Contracting Officer Thomas Council, Contracting Specialist, The release of this Addendum #01 is to clarify the equipment requirements for Medical Gas Equipment. Additional modifications include changes to the HVAC system providing cooling to the Medical Gas Room and the expansion of the floor slab and inclusion of housekeeping pads for the added equipment.
Drawing #: Description of the modifications:
A-112 Plan 2 – Modified the extent of the required excavations associated with the floor slab expansion to accommodate the changes for the cooling system (added AH-1) for the Medical Gas Room and for the relocated ACC.
A-114 Plan 2 – Modified the extent of the floor slab to square off and accommodate the changes in the cooling system (added AH-1) for the Medical Gas Room. Equipment housekeeping pads were added for the AH-1 equipment and the relocated condenser unit (ACC).
Added one new floor drain for AH-1 condensate. Keyed notes 20 and 21 were added for the expanded slab and housekeeping pads.
A-115 Plan 2 – Modified Medical Gas Room Reflected Ceiling plan to coordinate mechanical system changes to the diffusers and return grills. Removed split system unit and keyed note 3 was modified to remove the sentence, “Wall mounted equipment shall be securely fasten to the wall construction.”.
A-301 Section 1 - Modified the extent of the floor slab to accommodate the changes in the cooling system for the Medical Gas Room. Section 2 and 3 - Modified the extent of the floor slab to square off and expanded the slab to accommodate the changes in the cooling system for the Medical Gas Room.
E-001 Mechanical equipment electrical connection schedule was updated to include AH-1. Additionally, PR3A, PR3B and F-1 fans were scheduled per coordination with mechanical plans.
E-121 Electrical sub-basement floor plan was revised to include AH-1 unit, which replaced ACC-1.
E-703 Electrical panel schedule CLB-A4 was modified per circuitry changes.
EQ-111 Plan 2 – Modified the cooling system for the Medical Gas Room.
Removed split system unit and added AH-1. Equipment housekeeping pads were added for the AH-1 equipment and the relocated condenser unit (ACC).
FA-121 Fire alarm plan modified to include AH-1 supply and return duct detectors and fan shutdown relay.
M-111 Show new 2-1/2” chilled water supply and return connections to existing 12” CHWS/CHWR
M-114 Show new ducted air handler AH-1 serving MEDGAS Room.
Remove FCU-1 and ACC-1
M-118 Show new 2-1/2” chilled water supply and return connections, installed under phase-1 work as existing
M-503 Add detail for air handling unit piping connections
M-601 Remove schedules for FCU-1 and ACC-1. Add new air handling unit schedule
M-602 Modify air outlet schedule and water control valve schedule
M-605 Add control diagram for AH-1. Show piping to AH-1 on chilled water flow diagram
P-121 Extend floor drainage out to air handler AH-1
P-601 Add schedule for Medical Vacuum (MV-1) and schedule for Medical Air (MA-1)
SB-101 Plan A – Modified the extent of the floor slab to square off and accommodate the changes in the cooling system for the Medical Gas Room. Equipment housekeeping pads were added for the AH- 1 equipment and the relocated condenser unit.
End of Memorandum
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