B456 HVAC PRFIs_Answers_4Jan24.docx

B456 HVAC PRFI’s as of 4 Jan 24

-Will contractors be responsible for replacing drop ceiling after demo in CONS/ENG section?

Yes -Will all electrical be above ground outside?

Electrical conduits from B456 exterior wall to the HVAC unit and DOAS must be below ground.

-Will freeze protection be needed outside? (320-volt circuits) The electronics and circuits for the HVAC unit must be rated for below freezing temperatures.

-There are no convenience outlets outside, there will need to be some added.

No -Should selective demo outside be expected?

Yes. Selective demo is required for new natural gas lines and electrical conduits.

-IFB page 74 3.3: The work hours stated is T‐F (10hrs a day) and in the Specifications section 011100 1.19 states M‐F 7:30‐4:30. Please confirm which is correct?

Monday through Friday from 0600-4:30 is acceptable for this project.

-Is there a current Asbestos/LBP survey that can be provided for this building?

The building is 22 years old and an asbestos/LBP survey is not required.

-Do all of the designated ceilings need to be completely removed in each room or is up to the contractor to remove as much as needed to perform the work and just replace the sections removed?

Selective demo is acceptable if requirements below are met.

CUTTING AND PATCHING

A. Cutting and patching includes cutting into existing structures to provide for the performance of the work and subsequent fitting and patching as required to restore surfaces disturbed, damaged or otherwise altered to their original or specified condition.

B. Visual Requirements: Do not cut and patch work in a manner that would result in substantial visual evidence of cut and patch work. Remove and replace work judged by the COR to be cut and patched in a visually unsatisfactory manner.

C. If possible, retain the original installer or fabricator, or another recognized experienced and specialized firm to cut and patch.

D. Use materials for cutting and patching that are identical to existing materials. If identical materials are not available, or cannot be used, use materials that match existing adjacent surfaces to the fullest extent possible with regard to visual effect. Use materials for cutting and patching that will result in equal-or-better performance characteristics.

E. Restore surfaces of patched areas to match adjacent finishes. Where necessary, extend finish restoration into retained adjoining work in a manner, which will eliminate of patching and refinishing.

-What is the maximum amount of rooms (or sq. ft.) we can work in per phase?

Phase the project based on AD-101. Phase 1 - Area A, Phase 2 - 1/2 of Area B, Phase 3 - Area C and 1/2 of Area B. Beneficial occupancy will be provided for every completed room in each phase.

-Per the specifications the contractor is to remove the furniture. Is there a place in the building to store the furniture? If not, can it be stored in a conex box on site?

Space will be provided in B456 to move furniture if required.

-IFB 13.D states that the contractor is to hold their price for 180 days. Due to an unstable supply and vendors not holding their pricing no more than 30‐90 days on most items. Will the government allow adjustments to the final price if proper backup is provided?

No

-Is separate pricing required for any options on this requirement?

No. There are no options on this contract. This will be awarded as one lump sum and all options/ABI’s mentioned in the plans & specs will NOT be incorporated into the base bid of one lump sum. We will have a chain link fence per the plans that encompasses the AHU & DOAS area with an entrance. See separate drawing for layout & dimensions.

No – CMU Wall No – Storefront Doors No – Storefront Windows

We would like pricing broken down by trade, for evaluation purposes.

-Amendment #1 Comment #15 says “see attachment for new engineering / contacting office layout and HVAC plan. “. Duct sizes, CFM requirements, Wall locations and dimensions were not provided.

-Will new drawings be provided pre bid?

No

-Is this area a design build?

Yes, the HVAC company is responsible for sizing the supply/return duct work and VAV to support the proper CFM to the new rooms in the engineering/contracting office.

-Are the interior walls shown in the referenced attachment existing, or is it the intent for the KTR to include the framing of new walls, doors and finishes in the proposal?

The interior walls, doors, and finishes are existing.

-Amendment #1 Comment #7 states to Add ceiling grilles to existing VAV’s for fresh air to units. Please clarify the intent of this comment.

Add 1’ x 2’ egg crate grill below each VAV.

-Are the new grills to be ducted the DOAS system or is it an open ceiling plenum (no transfer air openings identified) No -Will new drawings be provided for bidding purposes?

No -Please provide CFM and Neck size of additional grills See response above

-Drawing S‐401 states a new slab but cannot find a drawing that shows the existing slab being removed. Please confirm that we are to remove the existing slab or just add to it per the new dimensions?

Demo existing housekeeping slab. The sidewalk will remain between the housekeeping pad and the building. The dimensions for the fence did not change in the drawing and the existing sidewalk is approximately 75 ½ inches away from the building. See attached drawing.

-There is also an existing light pole in conflict with the new equipment pad. Pole is not shown on the plans. Is this pole to be relocated or removed?

Relocate the light pole to the corner of the housekeeping pad.

-The existing equipment pad has pipe bollards but are not shown on the drawings. Are the existing pipe bollards to be removed or remain?

Demo the existing bollards (4).

-The existing specification is a basic commercial BACnet spec with a few issues:

· It has a section for a Web interface that is not allowed on the Base. (Part 2 2.2)

· The base standard is an extension of the existing Alerton system. This specification is generic.

· Panel mounted override switches are not used (Part 2 2.4)

· Telephone communications and mobile devices not used (Part 2 2.6 E,F, G, H)

· Wireless networks not allowed (2.9)

· Servers and printers not required (2.12 and 13)

· SQL Database Management Software not used (2.14)

· Maintenance Management Software not used or desired (2.16)

Replace the HVAC instrumentation and control specs with the Base Design Guide Standard Specification 230900. See separate attachment.

-Can the bid be extended?

Yes. The bid will be extended by one week and will now close on 16 January. See Amendment 2 SF30 for details.

-S-401 notes Unistrut with Direct mount base HDG finish but S-502 states standard pieces and fasteners to construct the H frames. Are the entire duct support assemblies to be standard Unistrut type product and bases with the Unistrut factory finish or is the base to be HDG and the rest of the support to be standard Unistrut type finish?

Just the bases are to be HDG finish and the standard pre-galvanized P90 finish is acceptable for the rest of the support.

-SECTION 230529 - HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT: Is there any specification for the duct supports or H stands that we need to refer to?

The specifications section for this is 230529 part 2.4, which calls for a pre-galvanized P90 finish for the metal framing systems. However, an HDG finish shall be used on the bases, per the note on S-401.

-What are acceptable locations to set temporary HVAC equipment?

Temporary HVAC equipment should be in the active construction zones and/or perimeter. The temporary HVAC equipment cannot impact occupants from entering and exiting the building and offices outside the phase area.

-Are there specific locations, exterior or interior walls, ceilings, etc.. where this building cannot be penetrated to accommodate the temporary HVAC?

The only limitation is that the contractor cannot alter or modify the building to support temporary HVAC. The contractor is responsible to protect existing building or structures including exterior landscaping and interior contents from damage, dirt and dust during construction related activities.

-Please provide all HVAC Test and Balance Report(s) for this entire building to appropriately assess the adequate environmental conditions required for the occupants? The report should include the cfm’s and temperatures required of each space to adequately provide temporary heating, cooling or exhaust during construction? Please provide a room by room air change schedule to accommodate the occupants.

We do not have the HVAC Test and Balance report for this building.

-Are specific Building Automation Systems required for the temporary HVAC Controls?

No -Specifications mention Portable heaters shall be “standard”. Please provide make, model, power and control requirements. What is the expectation to “monitor the heaters while being operated”?

Use and operation of portable heaters must meet OSHA, NFPA, and any other applicable codes.

-What types of fumes, vapors or gases exist or need to be exhausted on this project? Please provide all MSDS sheets related or creating these fumes, vapors, gases?

The contractor is not responsible for exhausting fumes, vapors, or gases developed by CE personnel. These activities are outside the construction zone with a separate system.

-Please provide the temperature heating and cooling set points allowed for each office/area/ or section that serve the occupants while occupied/unoccupied.

Occupied 69-72 degrees Fahrenheit, Unoccupied 64-78 degrees Fahrenheit -Please provide an HVAC schedule for occupied and unoccupied hours the system needs to comply with.

Occupied: Monday through Friday, 0600-1630 and on regularly scheduled drill weekends (Sat & Sun) 1st weekend of Feb, Apr, Jun, Aug, Oct, Dec.