UD Chillers RFI VA responses.pdf

# Question VA Final Answer 1 Per spec section 232113-2.2, 2.3, and 2.4 CWS&R and CDWS&R 2" and down is Copper with solder fittings and 2-1/2" and larger is standard weight ERW steel pipe with welded fittings and flanges. However, during the walkthrough all CDWS&R appeared to be schedule 10 stainless steel with welded fittings. All cooling tower pipe above rough line is to remain which would require connecting black steel pipe to stainless steel pipe. Is this correct?

Yes, correct.

2 E601 – Note #1 – Draw Out Breakers have Eaton Relays and Note #5 mentions we own adjusting these.

During the walk through Bldg 31 wasn’t available- We need the Specific Gear Information such as the Factory Order# or Build Specs? Based on our site experience we believe this main gear is actually Square D? Answering the above will clarify this.

Existing gear is Square D MasterClad Switchgear with Eaton Cutler-Hammer Digitrip 3000 relays.

Square D Factory Order Number: 24278712-009.

In addition, refer to attached submittal dated 11/28/2007.

3 E603 – Note #7 – Calls out for Bus extensions to the existing gear & Note #8 requires pull box to be fabricated. Square D Services will be required to perform this work, they’ve requested additional info such as Factory Order # or Build information, can this be provided? Both Manufactures have made an inquiry to visit the site and look at the gear themselves. Due to the specific requirements of the project, these details will make their process much easier to provide pricing to us.

Square D Factory Order Number: 24278712-009.

In addition, refer to attached submittal dated 11/28/2007.

4 EP111 – Note #3 - Calls out providing power and connection for heat trace then mentions providing the self regulating heat trace cable, M602 Note #6 Calls out for Mechanical to provide the detailed Heat Trace System. Can the VA clarify who’s to provide and install his system? If its electrical, can a length be provided?

The GC is responsible for providing this system and must coordinate with their subcontractors accordingly.

5 Can a walk through for Building 31 be scheduled with site electrical available in case we need to open some of the outdoor equipment to locate build info?

An additional walkthrough was advertised in Addendum 0003 and conducted on 12/15/2025.

6 Bid extension is requested due to the magnitude of the electrical equipment and numerous manufactures being involved in existing equipment .

Proposal due date is being extended from 01/12/2026 at 10:00AM EST to 01/21/2026 at 3:00PM per this Addendum 0004.

Proposal due date is being extended from 01/21/2026 at 10:00AM EST to 01/23/2026 at 3:00PM per this Addendum 0005.

7 Please provide specifications for Medium Voltage Transformers.

There is no specification for the Medium Voltage Transformers. The only mention of Medium Voltage Transformers is in the Medium Voltage Circuit Breaker Switchgear specification, which I interpret as only applying to close-coupled applications. Please advise, and please provide a Medium Voltage Transformer specification.

Specification Section 26 13 13 provides requirements for the new lineups and also refers to Section 26 13 16 for additional information/requirements for fusible interrupter sections.

8 Please provide specifications for the Busduct Specification Section 26 25 11 Busways is being provided.

9 Please confirm that you only want a spare 5" conduit between the existing MV pullbox and New MV Pullbox #1 and not all the way to new 8-MSVSGR-2.

An additional 5” conduit shall be installed between B Feed the existing MV pullbox and New MV Pullbox #1 as a spare pathway. B Feed shall also be provided parallel to this spare conduit.

Please confirm whether “Build America Buy America Act” (BABAA) requirements apply to this project.

Yes

We are going to consider the proposed location to stage the crane to perform the demolition work. We are seeking input as to whether or not this would be an acceptable location, with the understanding that the crane would remain in that location for the duration of the demolition activities.

This generally corresponds to final placement in this area and coordination with the VA of the crane location indicated on GC101. Acceptable durations should be confirmed by the VA.

The project specifications list a short circuit, coordination, and arc flash analysis. Is there an existing study and SKM model available? Or do we have to remodel the entire system and evaluate all equipment?

An “Electrical Coordination and Arc Flash Study” was completed in 2023 including short circuit analysis, protective device coordination study, voltage drop analysis, and arc flash hazard analysis. There is SKM model produced from this study. The VA will make this information available to the successful bidder.

All new medium voltage lineups appear to have medium voltage fusible switches incorporated. Please advise the intent of the Medium Voltage Circuit Breaker Switchgear specification.

All new MV switchgear line-ups are fusible-switch style (spec. section 26.13.16). The MV circuit breaker specification section (26.13.13) is included in the specifications because the standard VA specifications include the medium-voltage transformer requirements in the MV circuit breaker specification section.

Can the VA provide pictures or drawings of the existing equipment in Building 31 Bidders were given the opportunity to inspect and take photos at the additional walkthrough conducted on 12/15/2025. Refer to attached Square D submittal dated 11/28/2007.

E603 – Note #1 – Calls for (2) sets of 4/0 5kV Cable in existing 4” Conduit – does this pass through all the Manholes? 6/5/4/3/Pullbox/2/1. Will (2) sets of 4/0 4kV Cable fit in 4” conduit and has the derating factor been applied since there would be 6 current carrying conductors in one conduit.

This feeder passes through all manholes in question. Cable/conduit sizes and ratings have been verified with the basis of design medium voltage cabling indicated on the contract documents

E603 – Note #3 – Calls for (2) sets of 350 5kV cable in an existing 5” conduit. Can engineering verify this will fit in a 5” and meets the amperage needed with the derating factor?

Cable/conduit sizes and ratings have been verified with the basis of design medium voltage cabling indicated on the contract documents

E601 – Notes #3 & #4 – Calls for (2) sets of 4/0 5kV cable to be installed in existing 5”. Can engineering verify this will fit in a 5” and meets the amperage needed with the derating factor?

Cable/conduit sizes and ratings have been verified with the basis of design medium voltage cabling indicated on the contract documents

The project specifications list a short circuit, coordination, and arc flash analysis. Is there an existing study and SKM model available? Or do we have to remodel the entire system and evaluate all equipment.

An “Electrical Coordination and Arc Flash Study” was completed in 2023 including short circuit analysis, protective device coordination study, voltage drop analysis, and arc flash hazard analysis. There is SKM model produced from this study. The VA will make this information available to the successful bidder.

All new medium voltage lineups appear to have medium voltage fusible switches incorporated. Please advise if the intent of the Medium Voltage Circuit Breaker Switchgear specification is for reference to modification to existing equipment.

All new MV switchgear line-ups are fusible-switch style (spec. section 26.13.16). The MV circuit breaker specification section (26.13.13) is included in the specifications because the standard VA specifications include the medium-voltage transformer requirements in the MV circuit breaker specification section.

1 - The phasing notes on GC102 only goes up to 4.33 despite floorplan GC101 showing higher note numbers (EX: 4.5, 4.6, 4.7, 4.8). Please clarify.

2 - Please clarify which phase 8-PCHP-4 should be installed under.

1-Phasing notes on GC102 go up to 4.33, as do phasing callouts on GC101. Please clarify statement.

2-Pump is part of phase 4.

Specification 22 05 11 – Common Work Results for Plumbing requires all equipment, valves, filters, transmitters, and controls to be accessible from the floor or permanent work platforms without ladders (Section 1.5.E.1–2).

Field review of the mechanical room drawings indicates several valves, control devices, and piping elements shown above accessible ceiling heights or over other equipment where ladder access is required, conflicting with the spec.

References:

• Spec Volume II, Section 22 05 11, Part 1.5.E.1–2 (access requirements)

• Drawings: Mechanical plans (Pitt Chiller Plant – Drawings.pdf), equipment room layout (exact sheet to be verified) Question:

Please confirm whether the VA intends for the contractor to redesign or reroute piping/valves/controls to meet the strict floor-access requirement, or if variance approval may be granted for locations requiring ladder access.

This RFI does not provide specific locations of such instances. The contractor shall coordinate and make every effort to ensure these components are accessible from the floor or a permanent work platform without ladders.

Any proposed exceptions where ladder access would still be required must be specifically identified and submitted for review and approval by the COR. Such exceptions will be considered on a case‑by‑case basis and are not guaranteed approval.

Spec 22 05 11, Section 3.2 (Temporary Piping and Equipment) requires maintaining full system operation and prohibits creating dead legs. This may conflict with phasing requirements in Division 01 and possibly the drawings, which do not illustrate temporary connections.

References:

• Spec Volume II, Section 22 05 11, Part 3.2.A–C

• Division 01 – General Requirements (Volume I)

Question:

Please confirm whether temporary bypass piping, temporary pumps, or temporary valves are required for maintaining full building operation, and if so, which systems must remain active throughout construction.

This comment is refencing division 22 plumbing.

Plumbing work can be performed during phase 4.

Refer to MS102, MJ122, and M-603 for temporary connections for the chilled water system.

Spec 23 09 23 – Direct Digital Control System for HVAC references integration with hydronic systems and domestic water monitoring but does not include a clear sequence of operations for the upgraded chiller capacity project. Drawings appear to show control points but not operational logic.

References:

• Spec Volume II – Section 23 09 23 (controls)

• Mechanical Controls Drawings (verify sheets in plant control layouts)

Please refer to the M-800 series for control sequence, points list, and existing controls contractor contact information. Existing sequence of operation is already established for operational logic.

Question:

Please provide or confirm the required sequence of operations for:

1. Chiller staging

2. Pump lead/lag control

3. Tower operation logic

4. BAS alarming and trending requirements

5. Domestic water temperature/flow monitoring interface (spec 22 05 11 mentions integration)

Spec 22 05 11 – Part 1.4.I requires a full rigging plan including capacity documentation, operator qualifications, and path of travel. Spec 3.3.E additionally requires a PE-designed rigging plan for all equipment delivery. The drawings do not show any designated rigging routes.

References:

• Spec Volume II, Section 22 05 11, Parts 1.4.I and 3.3.E–F

• Drawings: Mechanical equipment access/room layout sheets

Question:

Please confirm the intended rigging path(s) for new chillers, pumps, and associated equipment.

Is the contractor responsible for determining and modifying structure/equipment removal paths at contractor cost, or will the VA designate acceptable routes?

Please refer to the MS101 for rigging path.

Contractor shall determine the least disruptive rigging path(s) and bear all costs associated with modifications to existing building or utilities.

Rigging path(s) as identified by the Contractor in the full rigging plan is subject to approval by the

VA.

Specs require all valves to be tagged, recorded, and provided in a valve list with floor plans (Section 22 05 11, Part 2.4.D). The drawings reviewed do not include:

• Valve schedule

• Valve tag numbering scheme

• Valve locations for all systems

References:

• Spec Volume II, Section 22 05 11, Part 2.4.D (valve tags, lists, frame location requirements)

• Piping Plans (verify specific sheets)

Question:

Please confirm whether the VA will provide:

1. A valve tagging convention, and

2. A complete valve schedule or if the contractor is required to generate both entirely from field interpretation of the drawings.

1-VA will provide guidance to the successful bidder on a tagging convention during the procurement phase of construction.

2-The Contractor should create a valve schedule based on the VA’s guidance.

Spec 22 05 23 – General-Duty Valves provides detailed requirements for backflow preventers, including reduced pressure assemblies and atmospheric vacuum breakers. Drawings do not clearly indicate:

• Backflow preventer types

• Required installation locations

• Associated drainage/air-gap details

References:

• Spec Volume II, Section 22 05 23, Parts 2.5.A–D (backflow preventer requirements)

• Plumbing and mechanical plans

Question:

Please confirm which piping systems require reduced pressure backflow preventers and which require atmospheric vacuum breakers. Additionally, confirm whether drain piping/air-gap devices are required at each unit as spec indicates.

Please provide reduced backflow preventer for chilled water make-up. Install per manufactures published data.

Existing backflow preventer shall be reused for the cooling towers.

Spec 22 05 11 – Pipe and Equipment Supports requires:

• Use of MSS SP-58 hangers

• Calcium silicate insulation shields at all hanger locations (Part 2.6.I & 2.6.J)

• Prohibition of strap, wire, chain hangers (Part 3.4.B)

However, the mechanical drawings do not identify hanger types, hanger spacing, or insulation shield locations. This creates ambiguity during coordination, fabrication, and installation.

References:

• Spec Vol II, Section 22 05 11, Parts 2.6.I–J and 3.4.B

• Piping drawings (Pitt Chiller Plant – Drawings.pdf)

Question:

Please confirm whether the VA requires contractor-designed hanger layout drawings, including:

1. Exact hanger types per location

2. Hanger spacing

3. Insulation shield type and thickness

4. Structural attachment details

Please provide hanger supports per M-502 and P-501. Contractor is responsible to provide coordination drawings for review per specifications 230511 and 220511

Drawings show CHW pumps but do not provide:

• Pump head calculations

• Required NPSH

• Flow turndown requirements

• Variable speed control logic

Specs refer to hydronic pumps under Section 23 21 23, but these details and performance criteria are not included in the provided spec volumes.

1-Refer to pump schedule on M-701 2-Pumps will be equipped with VFDs 3-Refer to M-803 for points 4-Refer to M-803 for lead/lag

References:

• Spec Vol II, Table of Contents lists Section 23 21 23 (Hydronic Pumps), but detailed content not visible in current extract.

• Mechanical schedules/drawings for pumps.

Question:

Please confirm required pump performance criteria, including:

1. Total dynamic head (TDH) requirement

2. System curve or flow balancing method

3. VFD control points (start/stop, speed signal source, BAS integration)

4. Pump redundancy/lead-lag requirements

Spec 22 05 11, Part 3.1.L requires domestic water temperature, pressure, and flow monitoring as part of BAS integration for Legionella mitigation.

However, Section 23 09 23 (controls) does not clearly define:

• Required control points

• Alarm thresholds

• Trending intervals

• Sensor types & placement

Drawings also do not show sensors on domestic water piping.

References:

• Spec Vol II, Section 22 05 11, Part 3.1.L

• Spec Section 23 09 23 (controls, incomplete in provided extract)

• Plumbing drawings

Question:

Please confirm the required domestic water BAS monitoring points and parameters, including:

1. Hot water supply temperature

2. Hot water return temperature

3. Domestic cold water pressure

4. Flow verification for recirculation systems

5. Alarm setpoints and required trending intervals

This is not part of the scope and should already be existing at the facility.

Specs require demolishing existing piping, tying into existing systems, and maintaining continuous operation (22 05 11, Parts 1.8 & 3.2). Drawings do not show:

• Exact tie-in points

• Existing pipe sizes or elevations

• Required isolation points

1. Exact tie-in locations and elevations to be determined in the field by the contractor.

2. All plumbing work can follow the phasing plan for Mechanical. Shutdown of specific systems may be permitted outside the

• Temporary shutdown durations Without these details, the contractor cannot plan shutdowns or provide accurate phasing.

References:

• Spec Vol II, Section 22 05 11, Parts 1.8 (work in existing building) and 3.2 (temporary systems)

• Mechanical demolition drawings

Question:

Please confirm:

1. Exact locations and elevations of all required tie-ins

2. Shutdown scheduling constraints beyond those listed (8 PM–5 AM off-season window)

3. Whether VA will allow brief service interruptions or requires full temporary bypassing constraints listed, but must be coordinated with the VA first.

3. VA to confirm on case-by-case basis depending on the criticality and use of the utility being shut down.

Spec 22 05 23 – Backflow Preventers requires:

• Drain piping

• Air-gap devices

• Visible discharge arrangements

Drawings do not show:

• Drain routing

• Air-gap fittings

• Floor drain locations relative to devices

This affects constructability and code compliance.

References:

• Spec Vol II, Section 22 05 23, Part 3.2.G.1 (drain & air-gap installation requirements)

• Plumbing drawings

Question:

Please confirm the intended drain routing for each RPZ and vacuum breaker, including whether new floor drains or indirect waste connections must be added.

The drains shall be routed to nearest floor drains. New drains are being added where required and existing drains are being reused.

Refer to plumbing drawings.

Spec 22 07 11 – Plumbing Insulation defines insulation types and general requirements, but drawings do not:

• Identify insulation thicknesses

• Identify jacketing types (ASJ, FSK, PVDC, aluminum)

• Distinguish between cold, hot, and concealed vs exposed piping

• Clarify condensation control for chilled water systems

References:

• Spec Vol II, Section 22 07 11 (general insulation requirements)

• Mechanical piping drawings

Refer to specifications for insulation thickness, jacket material, vapor barrier sealing, and insulation of fittings.

Hydronic piping insulation requirements are found in 230711.

Question:

Please provide or confirm the required insulation schedule, including:

1. Insulation thickness per pipe size

2. Jacket type per location (mechanical room, exterior, concealed)

3. Whether vapor barrier sealing is required for all chilled water systems

4. Whether valve and fitting insulation must match straight-run insulation

Specification 22 05 11 – Part 2.7 outlines sleeve requirements and requires all penetrations to be sealed using approved firestopping assemblies. The spec dictates:

• Sleeves extended above floors

• Specific materials for sleeves (cast iron, galvanized, brass depending on conditions)

• Mandatory use of rated firestop materials

• Watertight seals for floors receiving plumbing

However, the drawings lack:

• Firestopping UL system numbers

• Penetration details for piping clusters

• Identification of fire-rated walls and floors in mechanical spaces

This prevents the contractor from fully coordinating sleeve sizing and firestop assemblies.

References:

• Spec Vol II, Section 22 05 11, Part 2.7 (Pipe Penetrations)

• Architectural & Mechanical plans (fire ratings not clearly shown for all penetrations)

Question:

Please confirm:

1. Which specific wall/floor assemblies are fire-rated and require UL-listed firestopping.

2. Whether VA will provide UL assembly references, or if contractor must select UL systems.

3. Whether sleeves in mechanical rooms require firestopping or only sealant.

1-GI101 shows rated walls, refer to spec 078400.

2-Contractor to select.

3-Refer to specification 078400

Specification 22 05 11 – Part 1.5.I & Part 3.1.I requires piping systems to be flushed, pigged, cleaned, tested, and certified clean prior to acceptance.

However, the drawings and other Division 23 sections do not define:

• Flushing flow rates

• Chemical cleaning requirements

• Water treatment process for new CHW loops

• Required documentation format for cleanliness certification

• Sequence (before or after insulation? before or after tie-ins?)

References:

1-Refer to 232113, 221100 2- Refer to 232113,221100 3- Refer to 232113,221100 4- Refer to specifications for contractor responsibilities. VAPHS has utilized vendors Freedom Federal Services LLC and Chemway, Inc. for supplies.

• Spec Vol II, Section 22 05 11, Part 1.5.I & 3.1.I (cleanliness of piping/equipment)

• Section 23 25 00 (HVAC Water Treatment – referenced, but not provided in extracted text)

Question:

Please confirm cleaning requirements for the chilled water system, including:

1. Chemical flush required (yes/no, type).

2. Minimum flushing flow rate and duration.

3. Whether temporary strainers must be installed upstream of equipment.

4. Water treatment contractor responsibilities and VA-approved vendors.

Division 26 specifications list requirements for electrical installations, but drawings do not show:

• Circuit numbers for new chillers/pumps

• Breaker sizes

• Panelboard schedules

• Feeder/conductor sizes

• Power interlock details for DDC integration

• Emergency power requirements (ATS coordination)

Spec 26 05 11 & 26 24 16 referenced in the TOC require coordination, but details aren't visible in the provided extracts.

References:

• Spec Vol II Table of Contents (Div 26 references)

• Mechanical & electrical equipment schedules (in drawings)

Question:

Please confirm the following:

1. Required breaker size and feeder rating for each new mechanical load.

2. Whether new chillers must be served by emergency power.

3. Whether BAS interlocks must be hard-wired or network-only.

4. Whether VA will provide updated panel schedules, or contractor must create new ones.

1-Refer to both, single line diagrams and panel schedules for breaker and feeder sizes and ratings.

2- New chiller must be served by emergency power. Proposed electrical design includes this interconnection.

3- Hard-wired per Specification Section 23 09 23.

4- Contractor shall provide new/updated panel schedules in accordance with specifications.

Specification 22 05 11 – Part 2.4 and Section 09 91 00 (Painting) require:

• Color-coded pipe labeling

• Directional flow arrows

• Equipment identification tags

• Valve tags with engraved plates and framed lists

Drawings do not show:

• Pipe label types

1-Refer to 099100 2- Every 20’ 3- Match existing 4- Not required.

• Color codes

• Label spacing

• Label wording conventions (CHWS, CHWR, COND, etc.)

References:

• Spec Vol II, Section 22 05 11, Part 2.4.A–D (identification requirements)

• No labeling schedule on the drawings

Question:

Please confirm VA’s required labeling standard (ANSI A13.1 or VA-specific scheme) and provide:

1. Pipe label colors & wording

2. Spacing requirements (every 20 ft? Per corridor?)

3. Whether label backgrounds must match VA standard colors

4. If digital QR code asset tags are required

Spec 22 05 11 – Part 2.7 lists multiple types of sleeves (galvanized, cast iron, brass, fiber, moisture-resistant plastic) depending on floor type and exposure.

Drawings do not assign sleeve material by location.

Uncertainty exists for:

• Mechanical room floors

• Roof penetrations

• Below-grade penetrations

• Existing slab core drilling

Additionally, sleeves require 1" clearance beyond insulation O.D., but drawings do not dimension sleeve sizes.

References:

• Spec Vol II, Section 22 05 11, Part 2.7.A–J (sleeve materials & moisture protection) Question:

Please confirm sleeve material requirements for:

1. Roof penetrations

2. CMU wall penetrations

3. Existing concrete slabs

4. Below-grade exterior penetrations

Refer to specifications 230511

Spec 22 05 11 – Part 3.1.I & Part 3.4.F requires:

• Concrete housekeeping pads sized to equipment + 2" each side

• 3000 psi concrete (minimum)

• Anchor bolts placed in sleeves

1. Pad sizes depend on equipment size and anchor bolt configuration. Minimum 6” all around equipment walls and minimum 6” from

• Epoxy grout required under all equipment

• Review of structural drawings for additional requirements

However, the mechanical drawings do not provide:

• Pad dimensions

• Pad elevations

• Anchoring diagrams

• Whether existing pads may be reused

References:

• Spec Vol II, Section 22 05 11, Parts 3.1.I and 3.4.F

• Mechanical equipment layout sheets (pads not dimensioned)

Question:

Please confirm:

1. Required pad sizes for each piece of equipment.

2. Whether existing pads must be demolished or reused.

3. Whether seismic anchorage is required at this facility.

CL of anchor bolt attachments, whichever requires the larger pad (Detail 5, 6/S-501).

2. New pads are required for new equipment unless it can be demonstrated that existing pads will work for new equipment. Existing pads that conflict with the proposed equipment shall be demolished by contractor.

3. Seismic anchorage is not required for this project.

Specification 22 05 11 – Part 3.5 (Plumbing Systems Demolition) requires:

• Removal of all existing piping, valves, insulation, hangers, and concrete equipment pads not reused

• Delivery of salvageable valves, gauges, and thermometers to VA (Part 3.5.D)

• Protection of operational equipment during demolition

• Full cleanup and removal of debris daily

However, demolition drawings do not clearly identify:

• Which existing piping systems are to remain

• Which hangers/supports must be removed or reused

• Which valves/gauges are designated for salvage

• Whether insulation removal must include hazardous abatement procedures (not defined)

References:

• Spec Vol II, Section 22 05 11, Part 3.5.A–D (demolition requirements)

• Mechanical demolition drawings (Pitt Chiller Plant – Drawings.pdf)

Question:

Please confirm:

1. Exact demolition limits for piping, supports, and insulation.

2. Which valves/gauges must be preserved and turned over to VA.

3. Whether insulation is assumed to be non-hazardous or requires abatement.

1-Plumbing drawings show and indicate what needs to be demolished.

2- VA will coordinate with Contractor prior to the start of demolition to tag and/or list valves/gauges to be turned over.

3- Per the “REGULATED BUILDING MATERIALS SURVEY REPORT” by Mabbett & Associates, Inc.

dated April 2, 2021, suspect materials were identified, tested and came back negative for asbestos. This report was provided to bidders in Addendum 0002.

4-Refer to Structural drawings.

4. Whether existing pads should be demolished unless explicitly noted to remain.

Spec 22 05 11 – Part 1.8.E states that new equipment and systems will be placed under VA control once of “beneficial use,” and deficiencies corrected before transfer.

However, beneficial use criteria are not defined, leaving uncertainty regarding:

• What level of completion is required

• Commissioning prerequisites

• TAB completion requirements

• BAS integration requirements

• Whether temporary operation counts as beneficial use

References:

• Spec Vol II, Section 22 05 11, Part 1.8.E (beneficial use)

• Division 01 commissioning/testing references

Question:

Please define “beneficial use” for this project, including:

1. Whether systems must be fully commissioned prior to turnover.

2. Whether all punchlist items must be complete.

3. Whether partial operational capability is acceptable.

Fully commissioned, operable, and complete system must be turned over to the VA.

Spec 22 05 11 – Part 1.5.C requires:

• Welders qualified to ASME BPVC Section IX

• Stamped welds

• Proof of current certification

• Compliance with ASME B31.1

Drawings do not indicate:

• Which piping systems require certified welding

• Whether shop welds require stamping

• Whether weld mapping is required

• Whether the VA requires inspection hold points

References:

• Spec Vol II, Section 22 05 11, Part 1.5.C (welding requirements)

Question:

Please confirm welding requirements, including:

1. Required certification level for welders performing hydronic/chilled water welds.

2. Whether weld maps must be submitted.

3. Whether third-party inspection is required.

Refer to specification 230511 for welding requirements.

4. If weld stamping is required for shop welds or field welds only.

Spec 22 05 11 – Part 1.7.D requires the as-built drawings to identify LOTO points including:

• Breaker locations and numbers

• Valve tag numbers

• Energy sources for all equipment

This level of detail is not shown on the drawings and typically requires VA facilities input.

References:

• Spec Vol II, Section 22 05 11, Part 1.7.D (LOTO points in as-builts) Question:

Please confirm:

1. Whether VA will provide existing LOTO information (breaker numbers, valve IDs).

2. Whether contractor must survey and verify all LOTO points before construction.

3. The required format for LOTO documentation in as-builts.

Refer to electrical drawings for energy source information for equipment.

Contractor shall survey and familiarize themselves with all LOTO points before construction commences. Contractor shall coordinate with VA to confirm all LOTO points are identified. Contractor shall, as part of as-built documentation, provide a list and location drawing of all LOTO points. There is no standard format for LOTO as-builts.

Spec 22 05 19 – Water Meters requires:

• BACnet Ethernet communication

• HTTP/SMTP or Modbus interfaces

• Relays for alarms

• Remote readout per AWWA C706

Drawings do not show:

• Network connection points

• Cable routing

• BAS controller type or IP addressing scheme

• Whether VA or contractor provides network switches

References:

• Spec Vol II, Section 22 05 19, Parts 2.4–2.6 (meter networking requirements)

Question:

Please confirm:

1. Whether meters integrate into existing VA BAS or a new BAS segment.

2. Required network topology and physical connection locations.

3. Whether VA provides IP assignments and BACnet device IDs.

4. Whether alarms must report to central monitoring or local panels.

Refer to specification 230923

Spec 22 05 11 – Part 3.1.C requires all control devices, valves, and gauges be accessible from the floor or a permanent platform, explicitly prohibiting ladder access.

Drawings show:

This RFI does not provide specific locations of such instances. The contractor shall coordinate and make every effort to ensure these

• Control valves above 10 ft elevation

• Sensors located above major equipment

• Valves in congested areas with no access panels

This is a conflict between drawings and specifications.

References:

• Spec Vol II, Section 22 05 11, Part 3.1.C (equipment access requirements)

• Mechanical plan and sectional views (drawings)

Question:

Please confirm whether:

1. Contractor must reroute piping and controls to achieve floor-level access, or

2. VA will permit exceptions based on room limitations.

components are accessible from the floor or a permanent work platform without ladders.

Any proposed exceptions where ladder access would still be required must be specifically identified and submitted for review and approval by the COR. Such exceptions will be considered on a case‑by‑case basis and are not guaranteed approval.

Spec 22 05 11, Part 1.8.C restricts steam/condensate shutdowns to 8 PM–5 AM, but the drawings show areas where tie-ins appear inaccessible during occupied hours.

References:

• Spec Vol II, 22 05 11, Part 1.8.C (shutdown limitations) Question:

Confirm whether all mechanical shutdowns, not just steam, must occur after hours, or if daytime shutdowns for hydronic/chilled water systems are permitted with VA approval.

Yes, all shutdowns are coordinated with the VA. When viable, VA will work with successful bidder to conduct shutdowns during normal working hours provided shutdown results in no significant impact to patient care.

Spec references TAB in several areas but does not provide hydronic balancing criteria, flow tolerances, or required reporting formats.

References:

• 22 05 11 (general system requirements)

• 23 05 93 (TAB — referenced, but content not shown)

Question:

Please clarify:

1. Required accuracy (±5%? ±10%?)

2. Whether chilled water system requires full system flow verification

3. Whether VA requires NEBB or AABC certification

1 +/- 5% 2- Please clarify 3- Yes, refer to specification 230593

The controls spec does not define operation below 40°F, including tower fan cycling, condenser water bypass control, or freeze protection.

Question:

Please confirm winter operational sequence requirements for chillers, pumps, and cooling towers.

Chillers and cooling towers will be off and drained during the winter months. Only one tower will be online to utilize free cooling 8-CT-

4. This tower has a basin heater and electric heat tracing. The sequence of operation also covers tower operation when the ambient temp is below 55F

23 25 00 (Water Treatment) is referenced, but drawings show no treatment skid, pot feeder, or chemical injection system.

Question:

Please confirm whether:

1. A chemical treatment skid must be provided

2. The VA has an existing system intended to be reused

3. Monitoring sensors must tie into BAS

1-Chemical system is existing and will be expanded for the new cooling tower.

2- Yes 3- Yes

Specs require PE-stamped support system for suspended equipment >500 lbs, but chilled water mains may exceed this weight when water-filled.

Question:

Confirm whether a full pipe support structural design package (PE-stamped) is required for:

• 6", 8", and 10" mains

• Pipe anchors and guides

• Seismic restraints

Yes

Specs require insulation of all piping but do not explicitly state whether:

• Valve bodies

• Flanges

• Strainers

• Unions

...must be insulated to match pipe thickness.

Question:

Please confirm insulation requirements for valves, fittings, and strainers.

Refer to specification 230711, Part 3

Specs require BAS continuity but do not state whether associated control panels must be fed by emergency power.

Question:

Please confirm which—if any—control panels and network switches must be on emergency circuits

Review electrical drawings for proposed circuitry, including source panel. Install per contract documents.

Spec 22 05 11, Part 3.6 lists items NOT to be painted (motors, controllers, valves, etc.), but Division 9 may require painting of exposed mechanical in occupied spaces.

Question:

Please clarify if exposed CHW/CDW piping in mechanical rooms requires paint or only labeling

1-Refer to 099100 2- Match existing

Drawings show equipment vibration isolators but specs do not detail:

• Spring deflection

Refer to 230511

• Neoprene pad thickness

• Seismic snubbers

• Base frame types

Question:

Confirm required vibration isolation criteria for chillers, pumps, and fans

Division 02 references lead paint removal, but drawings do not show existing paint materials for impacted areas.

Question:

Please confirm:

1. Whether a hazardous-material survey exists.

2. Whether contractor must test existing pipe insulation and coatings.

Lead paint testing report was provided to bidders in Addendum 0002.. Testing and removal must be done in accordance with Specification 028333.12.

Specs require full access for service, but drawings show tight equipment spacing without maintenance aisles.

Question:

Please confirm minimum clearance standards (e.g., 36", 42", or manufacturer-required).

All equipment is laid per manufacturers’ recommendations.

23 09 23 requires wiring segmentation, but drawings do not show:

• Control conduit pathways

• Separation of LV and HV cabling

• Wall/ceiling penetrations for control wiring

Question:

Confirm if control contractor must provide conduit or if electrical contractor must provide all raceways

The GC is responsible for providing this and must coordinate with their subcontractors accordingly

Spec requires recommended spare parts lists and specialized tools (22 05 11, Part 2.8), but none are listed in schedules.

Question:

Please provide required spare parts lists or confirm contractor must propose

Contractor is to provide list.

23 09 23 Specs do not define:

• Trend intervals (1 min? 5 min?)

• Alarm categories (critical vs non-critical)

• Data retention duration

Question:

Please confirm required BAS trending and alarming standards

Coordination with VA on existing trending intervals, alarm categories, and data retention duration shall occur following award to successful bidder.

Spec states contractor is responsible for “protection of all existing equipment,” but does not define acceptable protective measures.

Question:

Contractor is required to protect the existing equipment from damage. Type of protection is requirement of GC based on equipment, Confirm whether temporary dust partitions, poly sheeting, or hard-wall containment is required in mechanical rooms.

sensitivity, and type of work in the area (high dust, impact, etc). VA will not define protective measures needed. Any equipment damaged during work by GC will be the responsibility of the GC to repair/replace.

Spec requires:

• As-built control sequences

• Calibration sheets

• Piping isometrics

• Test reports

…but does not define submission format (PDF? Native formats? VA template?).

Question:

Please confirm the required format, organization, and delivery method for all commissioning documents.

Organization of commissioning documents should follow Specification 019100. Contractor shall provide PDF files to the VA via online file share (i.e. Procore or other service). There is no pre-defined template for these reports. For further information on commissioning requirements during construction, refer to “Commissioning Criteria (PG-18-10)” via VA website – www.cfm.va.gov/til/.

1 - The riser diagram on DWG E-604 shows XFMR 8C and a 1000A switch for Distribution Panel 8C, but these pieces of equipment are not depicted on the electrical floorplans. Please identify the locations of these pieces of equipment on the floorplan.

2 - Please clarify if XFMR 8CLP is in the correct location.

1-Refer to Drawing ES101, Key Note 7 2-Proposed location for transformer is shown on electrical drawings. Final location shown be coordinated in field.

Please provide a list of approved valve manufacturers for the Hydronic Piping Spec 232113 section 2.8 Valves. There are currently no manufacturers listed.

The VA does not allow manufactures to be listed. Only basis of design or approved equal.

The CHW flow diagram, drawing M-601 shows 24” CHW drops, tees and reducers to tie into the existing system. The plan view, drawing M-121 shows the 24” reducing and then dropping as 16”. Which is correct?

Drawing M-121.

Can Chiller No. 3 and the six (6) pumps to be relocated be stored on site, or will they need to be stored offsite prior to reinstall?

Chiller No. 3 and six (6) pumps must be stored off-site. Equipment shall be stored indoors fully protected from weather and moisture. Final coordination with VA shall occur following award to successful bidder.

Specification section 23 21 13-7 calls for the condenser water pipe to be Steel, ERW schedule

40. General note 3 on drawing M-602 calls for schedule 20 SS. Please clarify the condenser water material requirements.

All new condenser water piping shall be schedule 20 SS.

The Overcurrent Protective Device Coordination Study (Spec 26-05-73 ) Only new equipment is to be included, correct? Existing Equipment being connected or tied into doesn’t need included?

Associated equipment has been indicated on drawings and requirements have been indicated in the specifications. New equipment shall be coordinated with existing equipment accordingly.

The Temporary Chillers require the Busduct and some other medium and low voltage equipment, the Performance Schedule doesn’t seem correct? Installation time and scheduling would follow these long lead times. Please Confirm

Project schedule will be the responsibility of the GC, if longer construction time is needed, or a pre-construction admin (ordering) period is needed, that is to be negotiated with the VA.

In addition to the long lead times how will the VA address Outages around the long lead times and the requirements for certain temps for outages? Please provide additional information in regards to the multiple shutdowns.

This can vary greatly depending on lead times and GC scheduling. GC to coordinate with VA well in advance for all significant outages per Medical Center Requirements of base MATOC contract, typical.

Bus Duct is anywhere between 42-54 weeks after submittals and approvals. Some of the Gear, depending on the Manufacturer, could have just as long of a lead time. Please confirm that the VA will extend the number of days to complete, 540 days, will be increased to all for the long lead times and the Phasing of the Project.

Successful bidder shall prioritize thorough submission, review and release of long lead items as needed to best meet schedule. VA will entertain No Cost Time Extension(s) when reasonable and appropriate measures are taken to meet schedule to deliver project.

70 Please confirm that the EC is only responsible for the (10) 277 power connections to the new heat trace system provided by others.

Please confirm those circuits will be wired through the controller located on the first level.

Please clarify if the connections to the termination kits will be located above the roof level or below.

The GC is responsible for providing this system accordingly. Refer to Mechanical drawings for additional information, including quantities/lengths of heat tracing.

Circuits shall be wired through controller on first level.

Connections to termination kits shall be installed per manufacturer’s installation manual. Heat tracing shall be extended at least 12” into heated space of building.

71 Please confirm that the EC is only responsible for demoing/reconnection of the power connection for the HVAC control panels.

The GC is responsible for providing this system accordingly.

Please confirm the HVAC control panels will be provided/relocated/installed by someone other than the

EC.

72 The modifications to the existing Medium Voltage Switchgear will require a review from an order engineer at the plant. Plants are closed for the last 2 weeks of the calendar year, therefore, order engineers will not be available to review the existing equipment until after the holiday shut down.

Manufacturers are requesting additional time to provide an accurate and cost competitive Quote-BOM.

We are requesting a bid d ate extension of 2 weeks.

Proposal due date is being extended from 01/12/2026 at 10:00AM EST to 01/21/2026 at 3:00PM per this Addendum 0004.

Proposal due date is being extended from 01/21/2026 at 10:00AM EST to 01/23/2026 at 3:00PM per this Addendum 0005.

73 Regarding the 8-MVSWGR-1 HVLcc lineup changing the fuses and adding the section with 600E fuses: I sent a request for 600E fuses. Unfortunately, the bussing and the lineup is limited to 600A Max. Because of that we are limited to a 540E Max fuse size. If you need 600E fusing then we will have to change the entire lineup to 1200A bus. Please confirm if 540E fuse size is sufficient or if they are okay with bumping the bus up to 1200A to meet the requested 600E fusing.

Based on the electrical load calcs, this wouldn’t be an issue and 540E would be adequate.

74 RFI #1 issued with amendment 4, indicates we are using black steel pipe for the new CDW pipe and connecting to the existing schedule 10 SS pipe. RFI # 65 calls for all new CDW pipe to be schedule 20 SS. Which is correct?

All new condenser water piping shall be SS schedule 20 and the valves shall be non-stainless steel.

75 Per RFI Response #65 should all valves in the condenser water system also be stainless steel? If so, could you please provide a stainless steel valve spec?

All new condenser water piping shall be SS schedule 20 and the valves shall be non-stainless steel.

76 Can you also able to provide us with the factory label (clear picture would be great) off of the existing Distribution panelboard PNL 8A to add new CB plugs?

See Below. The VA does not have any submittal records on file for this panel. This is the only information relative to the label available.