190067 PREBID RFI GOVERNMENT RESPONSE_7APR COR.pdf

DEPARTMENT OF THE AIR FORCE

HEADQUARTERS 72 AIR BASE WING (AFMC)

TINKER AIR FORCE BASE OKLAHOMA

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07 APR 25

MEMORANDUM FOR AFSC/PZIOC ATTN: RACHEL SILVA

THROUGH: 72 ABW/CENM

FROM: 72 ABW/(CEED) (Engineering Division, TEPA)

SUBJECT: Pre-Bid RFI Responses Project: WWYK190067, REPAIR FIRE SUPPRESSION, B2136

Reference: Originator Contractor Memo, 31 JAN 25, Pre-Bid RFIs, WWYK190067, REPAIR FIRE

SUPPRESSION, B2136

This office reviewed the reference RFIs for the subject project and provided answers below. Please forward to the contractor(s) for their use in preparing proposals:

1. Request for information. Part of the project involves removing the existing flame detectors in the hangar bay. Will a new Det-Tronics flame detection system be required for early warning?

Government Response: Yes, flame detection system is required per SOW 2.3(2)(g). CC Flame detectors shall be provided such that all portions of the hangar bay are within the range and cone-of-vision of at least two detectors. Exception: The area of the hangar bay within 5 ft. (1.5 m) of the perimeter wall is not required to be within the cone-of-vision of an optical flame detector.

2. Request for information. Will it be possible to extend the duration of each phase. Six weeks per bay seems very short.

Government Response: NO. Contractor shall prepare and submit their Bid based on the SOW’s allotted time per Phase.

3. Request for information. Will a fire pump test be provided by the government to be able to provide system calculations or will the contractor be required to do his own test of the fire pumps?

Government Response: NO. The Govt. will not provide Fire Pump Test Results. The Contractor is required to do their own test of the Fire Pumps.

4. Request for information. - FM guide 3-26 table 2 calls for .60gpm 1200 s/f with 25.2Ksprinkler heads not the 14.2K heads listed on the plans. Should the contractor plan to use 14.2K heads or the 25.2K sprinkler heads? 2.3.1.14 Manufacturing and assembly of large, contiguous components, such as large aircraft, boats, and wind turbine blades, create the potential for shielded fires. The presence of these operations represents an increased fire hazard beyond typical HC-2 or HC-3 occupancies. For ceilings below 60 ft (18m) use Table 2.3.1.10. For ceilings above 60 ft (18 m) protect these areas with K25.2 (K360) sprinklers using a design of twelve sprinklers at 50 psi (3.5 bar).

Government Response: Sprinkler system shall be provided in accordance with the Change 2, 29 December 2022 “Sundown Policy for Foam Fire Suppression Systems”. Sprinkler system shall provide no less than 0.2 gpm/sqft (8 L/min./sqm) over the most remote 5,000 sqft.

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5. Request for information. Is seismic protection required for this project?

Government Response: Per Specification Section 21 13 13 Paragraph 3.4.1 and Section 21 13 16 Paragraph 3.4.1, protection of piping against earthquake damage is not required.

6. Request for information. What size is the water tank that supplies the fire protection systems?

Government Response: Per as-builts dated October 1986, the water storage tank is located near B2120 and is 475,000 gallons. 80% of the tank is underground.

7. Request for information. HVAC drawings and specifications, no design questions.

Government Response: N/A

8. Request for information. HVAC who is the contact for “Lock out-Tag out” the electrical service for this task?

Government Response: Upon award the Government will provide this information.

9. Request for information. Will the Government provide an Asbestos Inspection Report?

Government Response: YES

10. Request for information. Phasing closing paragraphs state that each phase will be limited to six weeks. Multiple trades are required to complete the work associated with each phase. Phases 2- 4 will require boom lifts to perform the work necessary. Demolition tasks of each phase will require partial progress before installation tasks can begin. Six weeks appears to be a compressed schedule for the coordination of the multiple trades and multiple tasks that will need to be completed in order to test and accept the completion of each phase in a safe and efficient manner. Can phasing durations be submitted with the proposals in lieu of the maximum six-week durations?

Government Response: NO. Contractor shall prepare and submit their Bid based on the SOW’s allotted time per Phase.

11. Request for information. Please confirm all overhead track cranes are operational and can be moved in order to access the work at the roof level.

12. Request for information. Keynote: 1 specifies Alarm Check Valves for each riser. May Riser Check Valves or Check Valves and Riser Manifolds, equipped with water-flow switches, be permitted in lieu of alarm check valves?

13. Request for information. FX101 Sprinkler System Schedule for Hangar Bay Density is specified as 0.60 GPM/SF over the remote 1200 sf in accordance with FM Data Sheet 3-26.

a. FMDS 03-26 (OCT-2024) Table 2.3.1.10 Note 3 requires minimum 14k sprinklers.

b. UFC 4-211-01 § 3-6.15.2 requires sprinklers to be quick-response uprights.

c. May pendant sprinklers be utilized in lieu of uprights that are required by

UFC 4-211-01.

Government Response: Sprinkler system shall be provided in accordance with the Change 2, 29 December 2022 “Sundown Policy for Foam Fire Suppression Systems”. Sprinkler system shall provide no less than 0.2 gpm/sqft (8 L/min./sqm) over the most remote 5,000 sqft. In addition to this criteria, provide wet pipe sprinkler system in accordance with UFC 4-211-01.

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14. FM Data Sheet 03-26 (OCT-2024) § 2.3.1.14 Manufacturing and assembly of large, contiguous components, such as large aircraft, boats, and wind turbine blades, create the potential for shielded fires. The presence of these operations represents an increased fire hazard beyond typical HC-2 or HC-3 occupancies. For ceilings below 60 ft (18 m) use Table 2.3.1.10. For ceilings above 60 ft (18 m) protect these areas with K25.2 (K360) sprinklers using a design of 12 sprinklers at 50 psi (3.5 bar).

a. FX101 Hangar Density of 0.60 gpm/sf over 1200 sf will require a minimum water supply of 720 gpm

b. FMDS 03-26 § 2.3.1.14 specified density of 12 K25.2 sprinklers @ 50 psi would require a minimum water supply of 2,138 gpm.

Government Response: Sprinkler system shall be provided in accordance with the Change 2, 29

15. Request for information. Fire Suppression System water Supply is identified as a tank and fire pump rated for 1500 gpm @ 100 psi.

Government Response: Pump 1 rated at 1,500 GPM @ 125 PSI and backup pump 2 rated at

1,500 GPM @ 100 PSI

16. Request for information. Please confirm design density of 0.60 gpm/sf over 1200 sf will be accepted and FMDS 03-26 § 2.3.1.14 is NOT applicable.

Government Response: Sprinkler system shall be provided in accordance with the Change 2, 29

17. Request for information. Reference keynote #4 on sheet FD109. Please confirm the pipes are to be grout filled from the location of the existing valves to the south and that no piping north of the valves is to be grout filled.

Government Response: Pipes are to be grout filled to the post indicator valve located north of the building and the fire department storage room where Keynote 4 is located. Underground is approximately 70 ft in length and 14" per as-builts dated October 1986.

18. Request for information. Reference key notes 1 & 2 on sheet FD108, key notes 2, 3 & 4 on sheet FD109 and key notes 3 & 6 on sheet FD110. What is the pipe diameter of each underground pipe referenced in these key notes? This information is not evident in the Government provided site visit photos.

Government Response: Per As-builts dated October 1986, FD108 Key Note 1 - Pipe is 6" in diameter, Key Note 2 - Pipe is 8" in Diameter; FD109 Key Note 2 - Pipe is 6" in diameter, Key Note 3 - Pipe is 8" in Diameter, Key Note 4 - Pipe is 14" in Diameter outside the building and 8" in Diameter inside the building; FD110 Key Note 3 - Pipe is 10" in diameter, Key Note 6 - Pipe is 14" in Diameter.

19. Request for information. What extent of the underfloor piping that is to be grout filled contains

AFFF?

Government Response: All of the underfloor piping to be grout filled within the parameter of the building contains AFFF. This is approximately 1,300 linear feet of 6" diameter piping per as-builts dated October 1986.

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20. Request for information. Who will be responsible for disposing of any AFFF that may be contained within tanks that are to be demoed or within piping that is to be demoed or grout filled?

Government Response: AFFF tanks and concentrate piping shall not be included in this project.

Contractor SOW shall begin on the downstream side of the AFFF concentrate proportioning valves. Proportioning valves, AFFF concentrate piping, and AFFF tanks shall remain. Please note, AFFF solution piping and components (downstream of the proportioning valve) is within the SOW for this project.

21. Request for information. Can as-builts be provided for the underground piping in the scope of work for this project?

Government Response: Yes, as-builts can be provided.

22. Request for information. Would the GOV please provide information regarding the hazardous chemical or component that is within the AFFF foam that needs to be disposed of for this project?

A MSDS or SDS on the product would suffice. And, please clarify/confirm that all items that contain this component need to be properly disposed as hazardous as well, such as the tank, piping, and cannon.

Government Response: This project does NOT require the Contractor to dispose of the AFF Foam and Tanks. The GOV calls for the removal of the accessories so as to isolate the Tanks and its contents. The GOV will dispose of the tanks and its contents. Please read the SOW very carefully and if there are still concerns, contact the CO for the project.

BASH JIMOH

Project Manager Tepa-HDR

MATTHEW MORRIS

Electrical Engineer Functional Area Staff