Attachment I - Consolidated PPIs Responses.pdf

B C D E F G H

Number Page Section Paragraph

Please identify the maximum permitted duration of HVAC, heating, ventilation, electrical, and compressed-air interruptions at each building. Confirm whether temporary HVAC, ventilation, heating, electrical service, or compressed air must be provided during any equipment replacement or utility cutover. If required, provide the areas served, operating hours, and required indoor conditions.

Temporary HVAC are not needed. Coordinate activities with ongoing user operations.

Please confirm whether the four buildings may be worked on concurrently or whether the Government requires a particular sequence or completion priority. Identify any seasonal restrictions, mission-related blackout periods, or dates when outages and equipment replacement will not be permitted.

Building 808 and 810 shall be scheduled consecutively to facilitate the swapping of uses.

The other two buildings can be worked on concurrently.

Section 01 45 00 requires the QC Manager to maintain a physical presence and perform only QC duties. Please confirm whether the minimum acceptable staffing arrangement is one dedicated QC Manager plus one individual serving jointly as Superintendent and SSHO, provided that individual meets both qualification requirements. Also confirm whether additional management personnel are required when work occurs simultaneously at separate buildings.

The same individual may serve all three roles. No additional management personnel are required when work occurs simultaneously at separate buildings

Buildings 845 and 1083 require BACnet integration into existing DDC systems. Please identify the existing DDC system manufacturer, front-end platform, controls service contractor, communication protocol, network location, and available controller capacity at each building. Confirm whether the contractor must use an installation-authorized controls vendor and provide available points lists, graphics standards, network addresses, and system access requirements.

The existing DDC platform/manufacturer of Building 1083 is Siemens and to be replaced. All the four buildings are required to integrate with the existing base-wide WebCTRL/ALC BAS system, Section 23 05 93 requires TAB of “indicated existing systems” and a Record of Existing Facility Conditions. Please identify, by building, the equipment, duct systems, air terminals, and operating conditions that must be measured before demolition.

Confirm whether complete pre-demolition airflow readings are required at every existing terminal or only at the equipment and primary duct connections.

Pre-demolition airflow readings are required only at the equipment and primary duct connections

Please provide available roof-system information for Buildings 808 and 810, including roof assembly, insulation thickness, deck construction, installation date, warranty status, warranty manufacturer, and original roofing contractor. Confirm whether an approved or manufacturer-authorized roofing contractor must perform the curb, flashing, and modified-bitumen repairs to preserve the existing warranty.

That information is unknown

Please confirm whether the existing roof openings and supporting structure are adequate for the scheduled replacement units.

Identify whether curb adapters are acceptable or whether complete curb replacement and structural modification are required.

Provide available structural or roof-framing as-built information and confirm who is responsible for engineering any required framing modifications.

See construction documents

Please clarify the division of responsibility between the contractor, Government, and Dominion Energy for the Building 810 service modification, including service disconnect/reconnection, meter base and meter, conductors ahead of the service point, utility engineering, inspections, scheduled outages, and utility charges. Confirm whether any Dominion Energy charges other than contractor-requested after-hours work must be included in the proposal.

Refer to power riser notes 14 and 15 on E-501 for Building 810.

Pre-Proposal Inquiry Submission Form SOLICITATION # N40085-26-R-0237, PROJECT TITLE: 26B078 - FS-808, 810, 845, 1083 REPLACE HVAC UNITS

Government Response Reference

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B C D E F G H

Please confirm that the existing Building 845 electrical service, Panel MDP, Disconnect MD1, and upstream distribution have been evaluated and are adequate for the scheduled 225A HVAC load, including the 54 kW supplemental electric heat. Provide available short-circuit, load, and coordination information. Confirm that modifications beyond the feeders, fuses, disconnects, and connections shown are not required unless specifically directed by modification.

Existing disconnect MD1 is a General Duty Safety Switch by Eaton/Cutler-Hammer rated 400A, 240V, 3P with 250A Class H fuses. Provide Class R time delay fuses with conversion kit sized in accordance with contract documents..

Drawing M-101 requires removal of fuel piping back to the abandoned underground tank. Please confirm that the underground tank will remain in place and that the contractor is not responsible for tank removal, pumping, cleaning, testing, closure certification, soil investigation, or environmental remediation. Identify the required termination point and approved method for capping the fuel piping at the tank.

Confirmed for building 845, the underground tank will remain in place. The required termination point is on the ground of mechanical room.

Drawing M-101 requires complete demolition of the wooden fence and both gates, as well as removal of overgrown vegetation around the unit, ductwork, fence, and building. Please confirm whether the fence and gates are to be replaced. If replacement is required, provide the required material, height, configuration, post foundations, gate sizes, hardware, and finish. Also identify the limits of vegetation removal and required final landscaping restoration.

The fence and gates are to be removed, Protect exterior AHU with concrete filled 48” tall painted steel pipe bollards.

Please provide the required dimensions, material, coating, anchorage, and design criteria for the new Building 845 equipment stand. Confirm whether the existing equipment pad has been evaluated for the approximately 2,115-pound replacement unit and whether pad enlargement, replacement, or structural engineering is required.

Extend equipment pad as needed for new unit. The existing equipment steel stand shall be demolished and replaced based on new unit by contractor.

Please identify the approved route and available openings for removing the existing DOAS and installing the approximately 1,945-pound replacement unit on the mechanical mezzanine. Confirm whether doors, louvers, walls, roof sections, railings, plumbing fixtures, or other building components may need temporary removal and restoration. Provide available access-opening dimensions and lifting restrictions.

Building 1083 mezzanine is open to the workshop, logistical issues will have to be coordinated with the NAVFAC Construction Manager.

Please confirm that the existing mezzanine and equipment supports have been evaluated for the replacement DOAS operating weight and rigging loads. Provide available structural drawings and required support or anchorage details. If structural modifications are required, identify their extent and whether engineered design is part of the contractor’s scope.

The M-101 and M-501 of Building 1083 will be updated and issued shortly, the new DOAS selection will meet structural requirement.

Please confirm that approved equivalents meeting the scheduled airflow, capacity, electrical, physical, controls, corrosion-protection, and efficiency requirements may be provided when the listed basis-of-design model is no longer available. Also confirm the acceptable refrigerant classification and whether equipment using a manufacturer’s current refrigerant will require any additional detection, ventilation, labeling, controls, or other project-specific safety modifications not presently shown.

Yes, approve equivalents meeting the bases of design and using a manufacturer’s current refrigerant.

16 26 What is the existing Manufacturer and Breaker Type for Panelboard M in Building 1083 Refer to demo note 4 on revised M-101

17 22 What class and voltage 225A fuses are required for Disconnect MD1 Existing disconnect MD1 is a General Duty Safety Switch by Eaton/Cutler-Hammer rated 400A, 240V, 3P with 250A Class H fuses. Provide Class R time delay fuses with conversion kit sized in accordance with contract documents..

18 22 Is Disconnect D2, 3P 400/NF-4X existing? Disconnect D2 is not existing

19 Please confirm that a Level 2 QC/SSHO is required Yes

20 Can QC/SSHO/Superintendent be the same individual? The same individual may serve all three roles.

B C D E F G H

Please confirm whether a curb adapter may be used in lieu of a new equipment curb if the replacement rooftop unit does not exceed the weight of the existing unit and all structural requirements are maintained. Utilizing a curb adapter could reduce roofing modifications and other costs (and labor) associated with installing a new curb.

Yes

22 3.6.1.2 23 09 00 Can we delete the one week long endurance test from the specification Yes

At the site visit, it was mentioned that classes will not be held inside Building 808 between Novemeber thru January. If for some reason the contractor is unable to mobilize during this time due to equipment ETA (or otherwise), should the contractor figure to conduct the Bldg 808 SOW either after-hours & weekeneds?

After-hours & weekeneds work are not required. Coordinated schedules with the NAVFAC Construction Manager and facility owner.

24 Please confirm that the exisiting furniture will be relocated by the facility in support of the working tasks required B808 & B810.

Currently all furniture is obstructing safe access to Div. 23 and Div. 26 scope of work

Yes

Regarding Bldg. 845, Please confirm that installation of a new fence is not required as part of this project upon completion of the work, as we do not believe this is the design intent. If a new fence is required, please provide the applicable specifications, details, and construction requirements.

New fence is not required, protect exterior AHU with concrete filled 48” tall painted steel pipe bollards.

26 Bldg 808- This building does not currently have DDControls. Does the customer want pricing to add this building to theWebCTRL system?

Yes, all the four buildings are required to integrate with the existing base-wide WebCTRL/ALC BAS system

27 Building 810 This building does not currently have DDCcontrols Does the customer want pricing to add thisbuilding to the WebCTRL system?

Yes, all the four buildings are required to integrate with the existing base-wide WebCTRL/ALC BAS system

Building 845 – This building does not currently have DDC controls. Does the customer want pricing to add this building to the WebCTRL system?

Yes, all the four buildings are required to integrate with the existing base-wide WebCTRL/ALC BAS system

Building 1083 – This building has a Siemens DDC front end. A note on M-601 states “THE UNIT SHALL COMMUNICATE WITH AND BE CONTROLLED THROUGH THE BACNET BUILDING DDC CONTROLLER” The Class J&A states that the only acceptable DDC Controls provider for this base is Automated Logic (ALC). How should we proceed?

The existing Siemens DDC controll of Building 1083 are to be replaced and integrated with the existing base-wide WebCTRL/ALC BAS system. The existing unit controllers of EF-1/2 and AHU-1 of Building 1083 should also be replaced. As-built control sheet will be provided for your information.

30 Do the Superintendent, SSHO and QC Manager need to be 3 separate individuals? No. The same individual may serve all three roles.

31 Can the period of performance be extended after award once the material/equipment lead times are confirmed due to current market conditions for the equipment for this project?

No. Coordinated with the NAVFAC Construction Manager.

32 Please provide the site visit attendee sign in sheet. Sent already

33 Please confirm whether asbestos or lead is present on this project, and if so, provide the relevant documentation.

Asbestos is not anticipated. If suspected lead paint is encountered, it shall be disposed of in the refuse stream with an accompanying TCLIP test.

B C D E F G H

34 (If building is occupied) Are there any phasing requirements? How many people will be in the building? Are there any temporary heating/cooling requirements?

No phasing requirement and no temporary heating/cooling requirements.

35 Is this project tax exempt? No

36 When do you anticipate on site work starting?

37 Are third party inspections required? None are anticipated

38 Is permitting required? None are anticipated

39 Are soil boring reports available? If not, it will be assumed that excavation will be clear of rocks and obstructions. No

40 Please provide bidding quantities for deteriorated underlayment (roofing)/base course (paving). See construction documents

41 Please confirm the manufacturer of the existing roofing system and who carries the current warranty of the roofing system. That information is unknown

42 Is there a bulk water fill i.e. a hydrant or water source we can pump from for grading operations in close proximity? No grading is anticipate

43 Are partitioning, dust containment, and/or negative air machines required for this project? Protect areas unaffected by construction from dust and debris

44 Is any landscaping restoration required for this project? For example; topsoil, seeding, and fertilizer. Building 845, See construction documents

45 Please confirm that existing unit dimensions, curb/opening dimensions, duct connections, gas piping, electrical connections, and condensate connections match the Contract Documents at each HVAC replacement location.

No

46 Please confirm that existing roof curbs and structural supports are suitable for the proposed replacement equipment, including dimensions, condition, attachment, and any required modifications.

Existing roof curbs and structural supports may not be suitable for the proposed replacement equipment

47 Please confirm that existing electrical panels, breakers, disconnects, and feeders have adequate capacity for the scheduled replacement HVAC equipment and identify any required upgrades.

Anticipated upgrades are shown. Also refer to 23 03 00.00 20 paragraph 1.5

48 Please confirm required shutdown procedures, responsible Government personnel, advance notice, inspection requirements, and acceptable outage windows for electrical, HVAC, gas, and other utilities.

Coordinated with the NAVFAC Construction Manager.

49 Please confirm how long each building or affected area may be without HVAC and whether temporary heating/cooling or other temporary measures are required to maintain operations.

Temporary HVAC are not needed. Coordinate activities with ongoing user operations.

B C D E F G H

50 Please confirm approved access routes, roof access, crane/rigging locations, staging areas, parking, gate/security requirements, and protection requirements for removal and installation of HVAC equipment.

Coordinated with the NAVFAC Construction Manager.

51 Please confirm whether any concealed utilities, wiring, piping, controls, or ductwork are known to exist within demolition/work areas that are not shown on the Contract Drawings.

Equipment and device locations are approximate. Field verify exact locations.

52 Please confirm the existing building automation system manufacturer, front-end system, Government controls POC, and requirements for network connection, BACnet configuration, graphics, trends, alarms, and point integration.

The only existing DDC platform/manufacturer is Siemens in Building 1083 and to be replaced. All the four buildings are required to integrate with the existing base-wide WebCTRL/ALC BAS system, 53 Please identify the existing controls system serving each building and confirm whether the new HVAC controls must integrate with an existing front end or be provided as a standalone system.

No existing DDC control system for Building 808/810/845. The existing Siemens DDC controll of Building 1083 are to be replaced and integrated with the existing base-wide WebCTRL/ALC BAS system. The existing unit controllers of EF-1/2 and AHU-1 of Building 1083 should also be replaced.

As-built control sheet will be provided for your information.

54 Please confirm existing refrigerant type and recovery requirements, and clarify whether existing gas piping is to be reused or replaced back to a specific connection point.

That information of existing refrigerant type is unknown, existing gas piping is to be replaced back to the gas meter.

55 Please confirm the existing BAS/control system, front-end system, network connection requirements, BACnet addressing, graphics, trends, alarms, and points required for the new DOAS-1 BACnet DDC panel.

Yes, The M-101 and M-601 of Building 1083 are updated and to be issued with the PPIs.

56 Please confirm that existing conditions shown on M-101 accurately represent equipment, ductwork, electrical service, condensate/drain connections, and available space in the mezzanine and first-floor work areas.

The M-101 and M-601 of Building 1083 are updated and to be issued with the PPIs. Equipment and device locations are approximate. Field verify exact locations.

57 Please confirm that existing roof systems, flashing, waterproofing, curbs, and supports have been inspected and are suitable for the replacement equipment. Clarify responsibility for deteriorated conditions discovered during construction.

Yes

58 Please confirm that existing ductwork, transitions, dampers, supports, and connections shown to remain are suitable for connection to new HVAC equipment. Clarify responsibility for deteriorated or incompatible ductwork discovered during demolition.

Yes

59 Please confirm that electrical equipment identified for reuse has been verified as operational and adequately sized. Clarify responsibility if existing equipment is defective, damaged, or undersized.

Reuse electrical equipment as shown. Also refer to 23 03 00.00 20 paragraph 1.5

60 Please confirm the Government's preferred sequence for work in Buildings 808, 810, 845, and 1083 and whether operational, occupancy, mission, or access restrictions require one building to be completed before another.

Building 808 and 810 shall be scheduled consecutively to facilitate the swapping of uses. The other two buildings can be worked on concurrently.

61 Please confirm whether HVAC replacement work may be performed during the specified regular working hours or whether building/mission requirements will require work outside those hours.

Refer to Specification 01 14 00, after-hours & weekeneds work are not required.

PPI Submission Form