PN 636 25 301 Responses to Question 6 pages.pdf

36C26326B0031 A0001 PN: 636-25-301 Correct HVAC Deficiencies Questions

Q: Does the VA require Pressure Independent Control Valves for the hot water and chilled water coils for all three air handlers?

A: Yes, the contractor shall install pressure independent control valves on air handlers 1 and 3.

Q: Does the VA require air flow monitoring stations for the supply air for all three air handlers?

A: Yes, air flow monitors are required on all three units as indicated in the controls sequences and controls schematics.

Q: We understand that the formal site visit was held on August 20, 2026. Would it be possible to schedule an additional walkthrough of the mechanical areas associated with AHU-3, AHU-1, the temporary HVAC systems, and the Building 6 boiler work?

Seeing the existing equipment, access conditions, piping, ductwork, controls, staging areas, and shutdown requirements would materially assist us in developing accurate mechanical pricing.

A: At this time, no additional site visit will be held.

Q: If an additional walkthrough cannot be accommodated, could you please provide the site-visit attendance list and any meeting minutes, photographs, questions, answers, or clarifications issued in connection with the August 20 walkthrough?

A: See attached Site Visit Sign-In Sheet.

Q: Temporary AHU Equipment Responsibility Reference: Part 3 pg. 16-22, Sheet 17-M601 We located schedules for temporary equipment including TF-1, TF-2, TCC-1, TCC-2, THC-1, THC-2, TH-1, TH-2, and VFD-TEMP-1/VFD-TEMP-2. Please confirm responsibility for furnishing and installing this temporary equipment package.

A: The contracting (construction) team is responsible for furnishing and installing the temporary equipment package and all work related to it.

Q: Building 1 Access / Temporary AHU Assembly Reference: Part 3 pg. 1-8, Sheet 1-MH103 The temporary AHU is shown within Building 1. Building 1 is currently under construction and is anticipated to be completed prior to this project. Is the temporary AHU work to assume a fully enclosed completed building with no special access available, or has the design assumed specific access openings, removable wall panels, unfinished areas, or other means for bringing temporary AHU components into the building?

A: Building 1 is assumed to be completed prior to the work commencing in the work areas indicated on the plans. Contract documents include information on accessibility and egress to the site as well as notes regarding removal and reinstallation of components such as existing louvers. Refer to Note 1 on sheet 1-MH103 for an example. Also refer to sheets 17-AE101 and 17-AE201 for additional information on access.

Q: AHU-3 Temporary Air Tie-In Location Reference: 17-MH102, 17-M401, 17-M504 We reviewed the contract documents but were unable to identify the exact connection point between the temporary air system and the AHU-3 distribution system after demolition of existing discharge ductwork. Please provide a clarification sketch showing the intended tie-in location and airflow path.

A: Refer to Sheet 17-MH102, including the temporary duct connection and blank-off arrangement indicated. Contractor is responsible for means and methods and detailed sequencing necessary to execute the indicated design. Coordinate required shutdowns with the VA COR in accordance with Sheet MH001 and the contract requirements.

Q: AHU-1 Temporary Air Tie-In Location Reference: 17-M402, 17-MH102-A We reviewed the temporary duct and plenum details but could not determine the intended temporary airflow path and final connection arrangement serving AHU-1 during reconstruction. Please provide a clarification sketch showing the temporary air tie-in sequence and final connection point.

A: The design intent is indicated in the drawings with multiple sections. It’s the contractor means and methods regarding how the contractor phases the work and coordinates with the VA COR for any required shutdowns.

Q: Duct Demolition / Temporary Air Sequence Reference: 17-M402, 17-MH102, 17-M504 Please clarify the intended sequence of:

• Existing duct demolition

• Temporary plenum installation

• Temporary AHU startup

• AHU reconstruction

• Final tie-back to permanent system

Specifically identify when the 4-hour shutdown windows occur and which systems are expected to remain operational during each phase.

A: Guidance on phasing is provided on Sheet MH001. The shutdown windows need to be coordinated with the VA COR as part of the construction scheduling plan and operational needs of the hospital.

Q: Overall AHU-1 / AHU-3 Phasing Reference: 17-MH102, 17-MH102-A, 17-M402

Please clarify the intended sequence between AHU-3 and AHU-1 work. The documents appear to indicate the temporary system initially serves AHU-3 and may later support AHU-1 reconstruction; however, the overall phasing remains unclear. Please provide the intended sequence of operation and identify whether both AHUs are ever expected to be out of service concurrently.

A: AHU-3 is the base work and AHU-1 is an Additive alternate. If AHU-1 work is included, it requires that the temporary unit remains to provide air to the AHU-1 system. It is not intended that both air handling units are ever expected to be out of service concurrently.

Q: Temporary Air Distribution Path Reference: 17-M402, 17-M504, 17-MH102 Drawings indicate temporary AHU ductwork/plenums occupy the same area as existing AHU-1 supply ductwork which is later removed under Additive Bid Item I.

Please provide a schematic or phasing sketch identifying the temporary airflow path and tie-in locations during both AHU-3 and AHU-1 reconstruction phases. We were unable to determine the complete airflow path from the contract documents.

A: The design documents do not indicate that the temporary ductwork/plenum occupies the same area as existing AHU-1. The plenum is shown to be installed over the top of the AHU-1 ductwork; refer to section 1 on sheet 17-M401.

Q: Temporary Air Removal Reference: 17-MH102 Keynote 8 AHU-3 is required to operate for seven days prior to removal of temporary air service.

Please clarify whether the temporary system remains installed for AHU-1 reconstruction or is intended to be removed following AHU-3 completion.

A: If AHU-1 Additive (Item II) is accepted, the temporary unit is to remain to serve the AHU-1 system. If AHU-1 Additive is not accepted the temporary unit is to be removed.

Q: Building 1 Penetrations / Restoration Reference: 1-MH103 Please clarify all wall and roof penetrations associated with installation of the temporary AHU system within Building 1 and identify required restoration following temporary equipment removal, including weatherproofing, roofing, wall assemblies, insulation, and architectural finishes.

A: This is contractor means and methods. The Intent as indicated on sheet 1-MH103 Note 12 is to remove Louvers to allow for the work and for contractor to provide a weather tight seal around remaining openings as indicated. Sheet Note 1 on 1-MD103 instructs expectations to return the room to pre-construction conditions.

Q: AHU-1 Operational Status During AHU-3 Work Reference: 17-M504 Keynotes 4, 7, and 8 Several notes indicate existing AHU-1 ductwork remains in place during AHU-3 work.

Please confirm AHU-1 remains fully operational during AHU-3 reconstruction and identify any anticipated AHU-1 shutdown requirements prior to execution of Additive Bid Item I.

A: AHU-1 to remain operational during AHU-3 work. There are no anticipated shutdowns for AHU-1 prior to execution of the Additive Bid Item.

Q: Temporary Utility Connections Reference: 1-MH103, 1-MP103, 17-MP102, 17-M503 Please clarify the exact scope and sequence for connecting the temporary AHU system to existing chilled water, heating water, steam, condensate, controls, and electrical systems. Specifically identify required outage durations and which utilities are intended to remain operational during temporary utility tie-ins.

A: A maximum four-hour outage window is acceptable for temporary utility tie-ins, subject to advance coordination and approval by the VA COR. Contractor shall submit the proposed outage date/time, affected systems, sequence of work, and contingency/restoration plan in accordance with the contract shutdown requirements.

Building 1, being primarily shell does not eliminate coordination requirements for active utilities or adjacent hospital operations.

Q: Temporary Utility Removal / Final Reconnection Reference: 1-MH103, 17-MP102, 17-M503 Please clarify the sequence for removal of temporary utility connections and final reconnection to AHU-3 and AHU-1. Identify all required shutdowns, cutovers, testing requirements, and operational verification periods associated with each transition.

A: Refer to MH001 for the required sequence, testing, and operational verification.

Contractor shall develop the detailed construction sequence and coordinate each required shutdown/cutover with the VA COR. This is outlined in the mechanical phasing notes on sheet MH001. Contractor to coordinate all listed items with the VA COR.

Q: Temporary AHU Controls Integration Reference: 17-M503, 17-M601 Temporary AHU controls are shown integrated with existing duct pressure sensors, humidification controls, VFDs, fire alarm interfaces, and the building automation system. Please clarify whether the temporary AHU system is intended to be fully commissioned and integrated into the existing BAS prior to any AHU shutdown activities.

A: Yes, the temporary AHU system is intended to be fully commissioned and integrated.

Refer to phasing notes on MH001.

Q: Shutdown Scheduling Requirements Reference: 17-MH102, 17-M402, 17-M503 Please provide the anticipated shutdown schedule and notification requirements associated with:

• Temporary utility tie-ins

• Temporary air system cutovers

• AHU-3 shutdown and startup

• AHU-1 shutdown and startup

• Temporary system removal

Please identify required owner notification periods and approval requirements for each outage or transition event.

A: Per specifications, coordinate with the VA and COR and refer to Phasing notes on

MH001.

Q: TAB and Commissioning Sequence Reference: 17-M503, 17-MH102 Please clarify balancing and commissioning requirements for the temporary air system and final systems. Specifically identify whether TAB and commissioning are required:

1. Following temporary AHU startup,

2. Following AHU-3 startup,

3. Following AHU-1 startup, and/or

4. At final project completion only.

A: TAB and commissioning requirements are required as part of temporary unit start-up, AHU-3 start-up and AHU-1 start-up. Refer to MH001for additional information.

Q: Temporary AHU Basis of Design vs Alternate Arrangements Reference: 1-MH103 General Note 1, 17-M505 Fan Remarks, 17-M601 Equipment Schedules The contract documents provide fully engineered schedules for temporary fans, coils, humidifiers, filters, and VFDs under designations TF-1, TF-2, TCC-1, TCC-2, THC-1, THC-2, TH-1, TH-2, and VFD-TEMP-1/VFD-TEMP-2. However, the documents also permit alternate arrangements including rental equipment, fan arrays, one large unit, or multiple smaller units.

Please clarify whether the scheduled equipment represents the intended basis-of-design system to be furnished, or whether the temporary system is intended to be performance-based only. If performance-based, please identify the minimum requirements governing contractor-proposed temporary air systems and any limitations on equipment substitution.

A: The system information is performance based; refer to sheet 1-MH103 and associated notes. Also refer to MH001 Temporary AHU Operation, Service, Maintenance and Response requirements. Proposed alternate arrangements remain subject to the minimum scheduled performance requirements and applicable approval requirements shown in the contract drawings.

Q: Will the VA please provide the sign-in sheet from the August 20th, 2026 site visit?

A: See attached Site Visit Sign-In Sheet.

Q: Building 17 - Reference drawing number FX001 – Fire Protection general notes “O” (See the snapshot below) What is the design intent and or purpose for the LIDAR scanning requirement with the fire protection scope?

A: This is not specific to Fire Protection and is described in detail in the project specifications, 01 00 00, 02 21 13, and other areas. This was requested by the VA to establish conditions at the beginning and completion of the project.