IFB No. OP141432 Questions and Answers Set 4.pdf

IFB No. OP141432 Q&A No. 4

September 15, 2026

To: All Potential Bidders

Subject: Questions and Answers No. 4 IFB No. OP141432 Union Station Gateway (USG) Data Center HVAC & Power Improvement

Attached please find the final list of questions from potential bidders with Metro’s formal answers, all pertaining to the subject Invitation for Bid (IFB). Note: Any change to the subject IFB will be issued under a formal Amendment to the IFB by Metro.

ATTACHMENT(S):

1. Final Questions & Answers File (No.92-100)

2. Planholders List

Issued by:

LOS ANGELES COUNTY METROPOLITAN TRANSPORTATION AUTHORITY

Misty Atalanta Alderaan Principal Contract Administrator

The information addressed in the attached Questions and Answers are for information purposes only and are not binding on LACMTA. Only formal written Amendments may revise solicitaion documents.

Question Answer Amendment?

1. Please confirm whether the USG Data Center will remain fully operational during construction.

Yes, USG Data Center will remain fully operational during construction.

No

2. If the data center must remain operational, please identify the required phasing, shutdown windows, blackout dates, and any restrictions on work around live critical systems.

Refer to specification "SUMMARY OF WORK 9.1.2026-01 11 00"

3.03 for work hours, notification requirements and blackout dates.

Also refer to specification "SUMMARY OF WORK-01 11 00" 3.02 for the need to coordinate all activities including any Maintenance activities with Metro representative.

Yes, Amendment No.7

3. Please confirm whether temporary cooling, temporary power, temporary PDUs, temporary UPS support, or temporary backup systems are required during construction.

No, none anticipated to be required No

4. Please confirm whether shutdowns will be allowed during normal business hours, after hours, weekends, or only during pre-approved maintenance windows.

Only during pre-approved maintenance windows. For IT systems, no shutdowns are expected unless single-corded devices are identified in a planned, orchestrated equipment cutover event, in which case coordination with Metro IT to establish a maintenance window is required.

No

5. Please provide the required advance notice period for planned electrical shutdowns, HVAC outages, controls cutovers, or data center access.

Refer to specification "SUMMARY OF WORK 9.1.2026-01 11 00"

3.03 for work hours

Yes, Amendment No.7

6. Please confirm whether the contractor is responsible for preparing a Method of Procedure / MOP for each shutdown, cutover, energization, or commissioning event.

Yes, refer to specification "SUMMARY OF WORK 9.1.2026-01 11 00" 3.02 for the need to coordiante all activities with Metro representative. All construction MoPs to be submitted to Metro representaive for coordiantion on all review and approvals.

Yes, Amendment No.7

7. Please confirm whether Metro has existing as-built drawings for the data center electrical, mechanical, controls, and PDU systems, and whether those documents will be issued to bidders.

Partial legacy MEP drawings are available for original construction (by IBM) and for various upgrades. All drawing detail may not be as built. EoR has included the relevant as built detail on current design drawings, based on available legacy info and site surveying.

No

8. Please confirm whether the existing PDUs are to be demolished and replaced, modified in place, or supplemented with new units.

Drawings should be clear as to which PDUs are (E) to be removed, (E) to be retained in place and (N).

No

9. Please identify the make, model, capacity, voltage, breaker configuration, and existing load served by each existing PDU to be modified or replaced.

Workloads should be considered conventional. Available IT inventories will be provided to the awarded contractor but not expected to be necessary for bidding. The two PDUs to remain are APC/Schneider manufacturer.

No

10. Please confirm whether the new PDU work requires factory startup, load testing, infrared scanning, coordination studies, arc-flash updates, or updated panel schedules.

New PDUs require field startup by factory authorized service technicians. Load bank testing, IR scanning, etc. will be as required by the Cx firm. EoR will be performing power studies including arc flash; contractor to support power studies and apply finished labels.

No

11. Please confirm whether the contractor is responsible for electrical coordination studies, short-circuit studies, arc-flash labeling, or updated single-line diagrams.

The contractor shall provide OPD detail and feeder lengths. The contractor shall make OPD adjustments and print and apply arc-flash labels. This is identified in Div 26 specifications.

No

12. Please confirm whether any existing UPS, generator, switchgear, ATS, or distribution equipment will be impacted by this work.

Existing UPS, generator, large switchgear and ATS equipment is not expected be impacted by this work. The existing fourth floor UPS input and second floor UPS output switchboards will require shutdowns to change breakers as indicated on drawings. The existing UPS load shutdowns should occur after all IT loads are supported by the new UPS-B, such that no IT equipment is shut down.

No

13. Please confirm whether any temporary power feeds, bypass panels, or temporary distribution equipment are required to maintain operations during construction.

Temporary power arrangements are not expected to be required.

Critical IT loads are understood to be dual-corded such the loads can be walked over from old to new PDUs without planned shutdowns and with low risk of unplanned shutdowns.

No

14. Please confirm the required HVAC system scope, including whether the work involves replacement, expansion, controls modification, piping modification, air distribution modification, or integration with existing chilled water systems.

The HVAC scope involves replacement, expansion, controls modification, piping modification, air distribution modification, and integration with existing chilled water systems. Refer to Mechanical Drawings and Specifications Div 23 for details.

No

15. Please confirm whether the work connects to the existing chiller plant serving the USG facility and whether chilled water tie-ins are required.

Yes. See Mechanical Plans and SUMMARY OF WORK 9.1.2026 for details.

No

16. Please confirm whether temporary cooling is required during HVAC shutdowns or system cutovers.

The phasing of HVAC systems is not anticipated to require temporary cooling, provided appropriate sequencing and coordination with electrical system cutovers.

No

17. Please identify the required testing, adjusting, and balancing requirements for the HVAC systems.

See Specification Section 23 05 93 - Testing, Adjusting, and Balancing for HVAC

No

18. Please confirm whether third-party commissioning is required.

If so, please confirm whether Metro will provide the commissioning agent or whether the contractor must include commissioning services.

Third-party data center commissioning required, not part of contractor scope. However the contractor will need to support Cx with test equipment and tradespeople. See "SUMMARY OF

WORK 9.1.2026- 01 91 13.

No

19. Please confirm whether Building Management System / controls integration is required, and identify the existing controls platform, vendor, and required point list.

Yes. Existing controls platform is Schneider Electric. Refer to mechanical plans and specifications in the bid documents for vendor-agnostic performance specifications.

No

20. Please confirm whether the lighting control system upgrades require integration into an existing Metro lighting control platform.

Yes, integration to existing lighting system is required, refer to electrical drawings and specifications.

No

21. Please identify any fire alarm, fire suppression, smoke detection, or clean-agent system impacts associated with this work.

See Fire Protection Plans and "SUMMARY OF WORK 9.1.2026" for details.

No

22. Please confirm whether hot work permits, fire watch, impairment plans, or special Metro safety permits will be required.

Yes, refer to specification "SUMMARY OF WORK 9.1.2026-01 11 00" 3.04 C

Yes, Amendment No.7

23. Please confirm whether any hazardous materials survey has been performed for the project area. If not, please confirm whether the contractor should include hazardous materials testing or abatement allowances.

Yes, survey has been performed. No hazardous materials or abatement allowances necessary.

No

24. Please confirm whether ceiling removal, flooring removal, wall patching, painting, access panel installation, or architectural restoration is required after MEP work.

Refer to drawings and "SUMMARY OF WORK 9.1.2026" for the requirements.

No

25. Please confirm whether coring, saw cutting, anchoring, or structural penetrations are required, and whether structural calculations or scanning/GPRS are required before penetrations.

Refer to drawings and "SUMMARY OF WORK 9.1.2026" for the requirements.

No

26. Please confirm whether Metro will provide laydown, staging, parking, loading dock access, freight elevator access, and secure storage.

Yes, refer to specification "SUMMARY OF WORK 9.1.2026-01 11 00" 3.04 D

Yes, Amendment No.7

27. Please confirm allowable work hours, site access requirements, security badging requirements, escort requirements, and any restrictions due to Union Station operations.

Refer to "SUMMARY OF WORK 9.1.2026" for the requirements. No

28. Please confirm whether contractor personnel are required to complete Metro safety orientation, security orientation, background checks, or site-specific training.

Refer to "SUMMARY OF WORK 9.1.2026" for the requirements. No

29. Please confirm whether the contractor must include all permits, plan check, inspections, utility coordination, LADBS coordination, or Metro internal approvals.

Plan check has been completed by Metro in-house Building & Safety. LADBS is not involved. Refer to specification "SUMMARY OF WORK 9.1.2026-01 11 00" 3.02 & 3.03 for coordination and permits.

Yes, Amendment No.7

30. Please confirm whether the contractor is responsible for producing record drawings, O&M manuals, equipment training, spare parts, warranties, and closeout documentation.

Refer to "SUMMARY OF WORK 9.1.2026" for the requirements. No

31. Please confirm whether the 15% SBE/DVBE goal is calculated against the total bid price, including all allowances, bonds, insurance, and overhead/profit.

Confirmed. The 15% SBE/DVBE goal is calculated against the Total Bid Price submitted at the time of bid opening, which inherently includes all base work, allowances, bonds, insurance, overhead, and profit.

Supporting Solicitation Language (To Cite in the Memo) Section 100 (Instructions to Bidders / Proposers) and the DEOD Instructions (Form 011 / Form 012) from the package/standard LACMTA language states:

1. The Basis of the Calculation (Total Bid Price) "The Small Business Enterprise (SBE) and Disabled Veteran Business Enterprise (DVBE) participation goals shall be expressed as a percentage of the total contract value, including all priced line items, allowances, and options exercised at the time of award."

2. Form 012 / Commitment Form Integration "Proposers shall list the dollar amount committed to each SBE/DVBE firm. The total percentage of commitment is derived by dividing the total aggregate dollar commitment to SBE/DVBE subcontractors by the Proposer's Total Bid/Proposal Price."

No

32. Please confirm whether subcontractor certification forms are required from all listed subcontractors at bid time or only from subcontractors used to meet the SBE/DVBE goal.

Yes, all certification forms are due with the bid submission on the due date and time. Per section IB-07; E: Failure to comply with the requirements outlined in the solicitation documents may result in an incomplete bid and rejected as non-responsive.

No

33. Please confirm whether a bidder may satisfy the CSLB license requirement through properly licensed subcontractors when the prime holds a Class B license.

Yes Yes, Amendment No.1

34. Please confirm whether Metro will issue a current planholders list and all addenda/Q&A responses before the bid due date.

Yes, per IB-03 Copies of the solicitation and LACMTA responses to all written questions requests for interpretation and requests for clarification will be available as provided in this IFB.

No

35. Please confirm whether bidders are required to acknowledge Amendment No. 1 on the Bid Letter only, or whether a signed copy of the amendment must also be submitted with the bid.

Yes, Per IB-06 acknowledgement of all issued Amendments in the Bid Letter is required. No additional acknowledgment other than the complete and notarized EXHBIT 5 - BID LETTER is needed.

No

36.What are the dimensions and capacity of the freight elevators?

Refer to SOW "SUMMARY OF WORK-01 11 00" 3.04 E for the

Main Freight Elevator information. Dimension: 6'-2"Wx 7'-5"L, Door opening: 4'-0"Wx 8'-0"H, Max Capacity: 4,500 LBS

[Travels from level P4 to the 27th floor]

Yes, Amendment No.7

37. Re: Project Information Note A-0.0: A-0.0; A2.02; D-1.0 a)A mandatory pre-bid walk is required to identify above-ceiling conditions related to extending existing pony walls to full height and constructing new walls. Please advise on the ways to organize this visit.

b)Sections of the raised floor should be opened to allow observation of underfloor conditions at locations where pedestal support will be required for new walls, as well as for heavy-duty pedestal supports beneath equipment.

- Wall construction details on Sheet D-1.0 do not show any pedestals for the walls and appear to show direct installation on the existing slab. Please confirm if this is correct.

- Please identify all equipment requiring pedestal supports and show their corresponding locations

a) 2 worksite visits were held, June 17 and July 8 2026. Sign in sheets are available in Q&A set No. 2

b) Access to floors and ceilings were allowed during Prebid walks.

c) Detail 8&10 on Sheet D-1.0 describe the walls being installed on slab.

d) Sheet E2.02 Note 3 and Sheet M5.04 Detail 03 identifies use of floor stands.

No

38.

a.Will trash dumpsters be permitted at the loading dock?

b. Will any equipment be removed by Metro, if yes, please identify.

Yes, Contractor to provide dumpsters as required in the loading dock area. Refer to section 01010 SOW and drawings on any or all equipment to be removed.

No

39. Is there a chance we can get a secondary site walk?

Can I bring a couple sub’s to see the site? Yes, second site visit was held on July 8 2026. No

40. Can we perform a follow up site walk and bring our sub contractors? Yes, second site visit was held on July 8 2026.

41. Will the successful contractor be held to liquidated damages for the equipment specified by LA METRO, if the equipment manufacture does not meet delivery schedule?

No No

42. Does LA Metro have enough back stock of Raised Floor tiles to successfully complete this project? Contractor is responsible for any additions and or replacements.

No

43. Is LA Metro going to provide a coring company (to core holes between floors/roof) for the project? No, Contractor to provide for all scanning and coring as needed.

No

44.

Sheet E0.01 refers to Power Study in Summary of Work.

a.Is the contractor to supply OPD info and feeder length info to LA Metro so LA Metro can have the Power Study updated with their engineering firm? The contractor shall provide OPD details, The study reports shall be reviewed, stamped, and signed by a California Professional Electrical Engineer of Record (EEOR) and shall be submitted to Metro for approval. Refer to Specification 26 05 73.

No

45.

Sheet E2.02 shows electrical panels (N) PNL-A1-2 & (N) PNL-B1- 2, both with note (image of 6 in a diamond) . Note (image of 6 in a diamond) indicates “Furnished and installed by Metro”.

a.Is Metro to Furnish and install the panels, breakers, conduit and wire from the PDU’s to the panels for these two panels?

Yes, Metro shall furnish and install conduit, wiring and breakers to and within the specific pod expansion cabinets as noted on Sheet Note #6 on Sheet E2.02

No

46.

Sheet E3.02 shows work to be done with three different light fixture symbols.

Sheet E6.05 only indicates two different light fixtures.

a.What is the part number for the 2’x2’ light fixtures?

b.Is there battery back-up light fixtures?

A. Part number for 2'X2' fixture is: Lithonia STAK-2X2-4000LM-

35K-EZT-MVOLT.

B. Battery backup is addressed on Sheet A-3.0 where the symbol legend says all lighting to be on emergency power circuits, and Sheet Keynote 3 that calls for the contractor to provide emergency lighting per code.

No

47.

Exhibit A- SOW, Section 01 12 19, Part 2, refers to a 2,000kVA medium Voltage temp transformer.

a.This transformer work is not shown on the drawings and was not discussed during the site walk.

b. Please advise.

No MV work is required. Disregard the reference to the transformer, it has been removed in the revised "SUMMARY OF WORK 9.1.2026" document

No

48. Is there a preferred manufacturer for the (4) new PDU’s?

a.What are the spec’s for the (2)60kVA & (2)150kVA PDU’s?

b.How many output breakers? Size? Type?

PDU purchase specs with approved vendors are included in the bid package. Branch breaker details are included in the drawing panel schedules.

No

49. Is LA Metro to provide their roofing contractor for the project?

To seal roof penetrations?

No, Contractor to arrange roofing work per drawings and "SUMMARY OF WORK 9.1.2026" Sec 07 62 00

No

50. What are the pipe material options and connection type for the new CHW pipe. Copper or Steel pipe? Brazing , Welded or Grooved fittings?

See "SUMMARY OF WORK 9.1.2026" Sections 23 31 13 - Hydronic Piping and 23 21 16 Hydronic Piping Specialties

No

51. Sheet F0.02, Section 2.3 (B) is requiring 10 minutes of alarm after 90 hours stand-by (FM).

a. Are the new Preaction Systems required to be design based on FM Global standards?

b. Is this site insured by FM Global?

No, FM Global does not apply, disregard the indicated reference.

Drawing F0.02 reissued with Q&A Set No.3 to correct/remove this reference

No

52. Sheet F0.02, Section 2.3 Integrated Releasing Control Panel – VFR-400 is requiring the releasing panel to be fully integrated to the cabinet enclosure. The VFR-400 is a conventional fire releasing panel that does not have sufficient zones to individually monitor the Preaction sprinkler riser inputs and the multiple air sampling signals, unless the signals are combined into the limited zones.

a.Can the integrated conventional panel be replaced with an addressable fire releasing panel to properly monitor the signals from the Preaction sprinkler riser and air sampling detector(s) and power supply?

The fire protection drawings are intended to be a high-level performance specification only; the installing contractor shall develop the detailed design for deferred permit submittal. That detailed design shall be tailored with equipment/components compatible for the applications. EoR takes no exception to the installing contractor designing for and providing a modern addressable fire alarm releasing device in place of the indicated conventional device.

No

53. Note 1 on sheet F1.02 is specifying aspirating smoke detection at the ceiling level, at the bottom of the above structure and at the return air intakes of the associated critical cooling units.

a.Is the area above the ceiling used a return air plenum?

b.Is the area above the ceiling considered a combustible space?

(a.) Yes, the above ceiling cavity is part of the return air path to the new CRAH units, and as such (b.) No, it is not to be considered a combustible space. All materials in the return air plenum shall meet fire-resistance and smoke-generation standards.

No

54. Provide clean agent system and fire alarm system as builts for the affected areas.

Pre-action, clean agent and fire alarm as-builts are available for reference only.

55. Do all new Preaction areas with raised floors require to be protected with smoke detection below the raised floors?

No. The raised access flooring cavity will no longer act as a supply air plenum and thus should not require smoke detection coverage.

Refer to Mechanical Plans reflecting system no longer using raised floor as supply plenum.

No

56. LV1-01 - New ladder racking:

a.What size and color is to be provided/installed?

b.Who are the acceptable manufacturers?

Ladder rack is to match APC AR8165AKIT, 12" wide, 2" deep.

Metro is standardized on APC for the Pod components. Drawing LV1-01 (Q&A Set No.3) has product matching reference.

No

57. LV1-01 - New underfloor cable tray:

a.What size and color is to be provided/installed?

b.Who are the acceptable manufacturers?

Underfloor cable tray is to be compatible with PW 5F78-0012-18.

Equivalent product is allowed. Aluminum, 12-foot lengths by 5" high, 18" wide, vented bottom (See LV1-01 Q&A Set No.3)

No

58. LV1-01 - OM4 24 strand fiber from Tech Center:

a.Is the fiber to be armored or installed in innerduct?

b.Fiber termination Type: LC or MTP?

c.Who are the acceptable manufacturers?

a. Fiber should be either armored or installed in innerduct, contractor to elect.

b. Fiber connectors are to be MTP.

c. Acceptable manufacturer is Panduit Opti-Core. (See LV1-01 Q&A Set No.3)

No

59. LV1-01 - OM4 24 strand fiber/(24) Cat. 6 cables between racks/cabinets in data center and ATMS:

a.Is the fiber to be armored or installed in innerduct?

b.Fiber termination Type: LC or MTP?

c.Fiber: Who are the acceptable manufacturers?

d.Copper: Who are the acceptable manufacturers?

a. No, Fiber between cabinets does not need to be armored or in innerduct.

b. Fiber terminations are to be MTP, connected to Panduit fiber cassettes with LC connectors on the bulkhead.

c. Fiber is to be Panduit Opti-Core OM4

d. Copper is to be Panduit TX6A 10-gig Cat 6A. (See LV1-01 Q&A Set No.3)

No

60.LV4-01:

a.For the POD in the data center structured cabling, is the contractor responsible for the providing and installing of the new MTP OS2 24 strand fiber and (24) Cat. 6 cables to all the existing and new cabinets?

b.Is there structured cabling redundancy the POD?

i.Path “A”: (1) 24 strand OS2 MTP fiber cable/(24) Cat. 6 cables ii.Path “B”: (1) 24 strand OS2 MTP fiber cable/(24) Cat. 6 cables c.Fiber: Is non-armored fiber acceptable for this cabling?

d.Fiber: Who are the acceptable manufacturers?

e.Copper: Who are the acceptable manufacturers?

a. Yes, contractor shall install the intercabinet structured cabling.

b. Redundant A-B cabling paths is not in the current SCCS design and would be accomplished via patch cords between aggregation cabinets in Rows A and B.

c. Non-armored cabling is acceptable between cabinets and rows on overhead ladder rack. Armored cabling or in innerduct is required for fiber running between rooms in the underfloor cable tray.

d. Fiber is to be Panduit Opti-Core.

e. Copper is to be Panduit TX6A 10-gig Cat 6A.

See clarification LV4-01 drawing; Q&A Set No. 3

No

61. LV1-00

SUN ORACLE RACK

IS THE SUN ORACLE RACK CURRENTLY IN USE OR IS IT

EMPTY? The Sun Oracle rack is in use and to remain.

No

62. LV1-00

SPECIFIC PLAN NOTES #3

THE 2 RACKS TO BE REMOVED, WHERE WILL THE CABLING

BE RELOCATED TO AND IS THIS THE CONTRACTOR’S

RESPONSIBILITY? IF SO IS THERE A RACK ELEVATION WITH

CABLE QUANTITIES. Owner will arrange cable relocation with the associated carrier(s).

No

63. CABLE SPECIFICATIONS

FIBER AND COPPER MANUFACTURES

IS THIS OPEN SPEC? See response to Question #60.

No

64. LV1-01

SPECIFIC NOTES #9

PLEASE CLAIRIFY IF WE ARE INSTALLING FIBER AND

COPPER CONNECTIVITY FROM ATMS TO ATMS AND PCI TO

PCI CABINETS ONLY, OR IF WE ARE INSTALLING

FROM ATMS TO PCI CABINETS AS WELL.

No connection between ATMS and PCI is required; only between racks in the same zone (i.e., ATMS to ATMS and PCI to PCI). This is identified in Notes #8 and #9 on Sheet LV1-01.

No

65. LV4-01

SPECIFIC NOTES #5

PLEASE CLAIRIFY INSTALLTION OF 24-SMF FROM EXISTING

POD TO TOP OF EACH OF THE (8) RACKS SHOWN IN PHASE 1

ROW A?

The fiber shall originate in the existing pod at the cabinet housing the Nexus 9K core switch and extend to each new cabinet in the Phase 2 expansion, referred to as the "extended containment pod." Fiber within the extended pod is to be Panduit Opti-Core MM OM4. See reference documents attached to Q&A set No. 3

No

66. LV4-01

SPECIFIC NOTES #6

PLEASE CLAIRIFY INSTALLTION OF 24- CATEGORY 6 CABLES

FROM EXISTING POD TO TOP OF EACH OF THE (8) RACKS

SHOWN IN PHASE 1 ROW A?

The copper shall originate in the existing pod at the cabinet housing the Nexus 9K core switch and extend to each new cabinet in the Phase 2 expansion, referred to as the "extended containment pod." Copper within the extended pod is to be Panduit TX6A 10-gig Cat 6A. See reference documents attached to Q&A set No. 3.

No

LATE SUBMISSIONS

Question Answer Amendment Y/N ?

67. Are we permitted to use SBE/DVBE firms that are certified under other NAICS codes, provided they are performing work within the scope of the project? Yes, you are permitted to do so.

No

68. Is there a directory where we can view the complete list of Metro-certified SBE and DVBE firms, rather than only those shown in Exhibit 4?

SBE Directory: https://smallbusinessquery.metro.net/main DVBE Directory:

https://caleprocure.ca.gov/pages/PublicSearch/supplier-search.aspx

No

69. Will SBE or DVBE firms certified through the California Department of General Services (DGS) satisfy the participation requirements, or must the firms be Metro-certified to be considered responsive?

ONLY DVBE FIRMS are recognized by METRO, LA Metro does NOT recognize SBE certified thru DGS

No

70. Can our company apply to become Metro-certified as an SBE?

If so, would our own SBE certification as the prime contractor count toward satisfying the 12% SBE participation goal?

Program details can be found here https://www.metro.net/about/small-and-disadvantaged-business-certifications/

No

71. Room 276A Light Fixtures: Sheet E3.02 indicates new 2' x 2' light fixtures in Room 276A (Tech Center); however, these fixtures are not included in the light fixture schedule on Sheet E6.05.

Please provide the fixture type and specifications.

Answered in first set, Question #46.

72. 300A Circuit Breaker at Panel DBCP: Sheet E7.11 shows existing distribution panelboard DBCP connected to a new 300A, 3-pole circuit breaker. Please provide the manufacturer and type/model of the required circuit breaker. Provide a standard GE/ABB breaker that matches and is compatible with switchboard DBCP, including fault current rating. No

73. Panel DBB Connection to Existing Busway BD-EI: Sheet E2.02 shows new Panel DBB connected to existing busway BD-EI with a 600A, 3-pole plug-in circuit breaker. However, Sheet E7.11 shows Panel DBB connected to the same busway through a 600AS/600AF disconnect switch. Please clarify which connection method is correct. Additionally, please provide the manufacturer and type of the existing busway BD-EI.

Provide either a fused switch or circuit breaker bus plug that is compatible with the GE/ABB busway. Match existing busway bus plugs, including the fault current rating. See Reference materials attached hereto No

74. PDU Panel Designations: Sheet E6.03 identifies new panels PDU-B1-2 and PDU-A1-2, while Sheet E7.11 identifies panels B1-2 and A1-2. Please confirm whether these are the same panels.

They are the same panels. PDU-A1 is a Scheider in-row PDU with an internal panel A1-1, existing. Along with the new Schneider pod, a new subfeed panel A1-2 will be included, fed from PDU- A1. Same for B side. See Reference materials attached hereto No

75. Panel DBUPS-B Neutral Bar: Reference Sheet E7.11. Panel DBUPS-B is shown as a 3-wire panel; however, the feeders entering and leaving the panel are shown as 4-wire plus ground.

Please confirm whether Panel DBUPS-B is intended to include a neutral bar.

Panel DBUPS-B feeds only standard 3 phase delta-wye stepdown transformers. No neutrals are required in panel DBUPS-B or in 480V load feeders. Sheet E7.11 has been revised with clouded changes to correct wiring (remove neutrals) and reduce conduit sizes. No

76. Panel DBUPS to PDU-A3 Wiring: The feeder between Panel DBUPS (new 100A breaker) and 60 kVA PDU-A3 is shown as 4-wire, while Panel DBUPS is shown as a 3-wire panel. Please confirm whether this is correct and whether Panel DBUPS is intended to include a neutral bar.

Panel DBUPS-B feeds only standard 3 phase delta-wye stepdown transformers. No neutrals are required in panel DBUPS-B or in 480V load feeders. Sheet E7.11 has been revised with clouded changes to correct wiring (remove neutrals) and reduce conduit sizes. Drawings can be found in Q&A Set No. 3. No

77. Panel DBCP to ACC1 Chiller Wiring: The feeder between distribution panelboard DBCP (new 300A, 3-pole breaker) and ACC1 Chiller is shown as 4-wire, while Panel DBCP is shown as a 3-wire panel. Please confirm whether this is correct and whether Panel DBCP is intended to include a neutral bar.

Panel DBCP (existing) feeds a new 3 phase chiller. No neutrals are required in panel DBCP or in the new 480V chiller load feeder.

Sheet E7.11 has been revised with clouded changes to correct wiring (remove neutrals) and reduce conduit sizes. Drawings can be found in Q&A Set No. 3.

No

78. Is factory witness testing and/or burn-in testing required for the PDUs?

FWT is not required for anything. Field performance testing under load is required for new equipment, as specified and to be further detailed by the Cx agent TBD.

No

79. Is site testing and/or commissioning assistance by the manufacturer required?

Onsite vendor tech support is required for complex equipment such as UPS systems, chillers and CRAH units during Cx.

No

80. Is NETA acceptance/injection testing required for the PDUs? No No

81. Are floor stands required for the PDUs? Yes, refer to Specification 26 26 00. No

82. Is a specific circuit breaker manufacturer required? If so, please identify the approved manufacturer(s). Yes, GE/ABB.

No

83. What level of subfeed monitoring is required for the PDUs? None

84. Are there any specific transformer requirements for the PDUs, including required temperature rise or other performance criteria? No

No

85. Request for Technical Specifications The bid documents do not appear to include the technical specifications for several trades. In order to obtain complete and accurate subcontractor quotations, please provide the applicable specifications for the following trades:

•Demolition •Electrical •Low Voltage •Fire Alarm •Fire Sprinkler

•HVAC

•Framing and Drywall •Flooring •Roofing •Structural Steel •Ceilings

Applicable specs are included in bid docs. These divisions 01-09, 21- 23, 26-28. Yes, Amendment No 7

Question Answer Amendment Y/N ?

86. Per Sheet E6.01, new Panel NP-A is identified as 208/120V, 3-phase, 4-wire and is shown as being fed from existing Panel NP, which is identified as 480/277V. In addition, existing Panel NP is shown on Sheet E7.11 as being fed from existing Distribution Board DBCP, identified as 480V, 3-phase, 3-wire, 1000A. Please clarify the correct voltage and phase/wire configuration for DBCP, NP, and NP-A.

New panel NP-A is 480V 3W+G. Sheet E7.11 has been revised with changes clouded to include wire and conduit sizes for panel NP-A. See reference documents attached to Q&A set No. 3.

No

87. Please provide the conduit size, conductor size, and any other feeder requirements between existing Panel NP and new Panel NP- A (refer to Sheet E7.11).

See reference documents attached to Q&A set No. 3. Sheet E7.11 has been revised with changes clouded to include wire and conduit sizes for panel NP-A.

No

88. Sheet E6.05 includes a Copper Feeder Schedule (0–600V).

Please confirm whether this schedule applies to this project. If it does, please identify the corresponding feeder designations, as no feeder tags or designations appear to be shown on the drawings.

Use the feeder schedule for mechanical loads. Use single-line diagram Sheet E7.11 for electrical loads. Sheet E7.11 has been revised with changes clouded to correct wiring (removed neutrals) and reduce conduit sizes. Drawings can be found in Q&A Set No.

3.

No

89. please provide Spec Sections 26, 27, 28

Div 26, 27, 28 specs have been provided in "SUMMARY OF WORK 9.1.2026" see page 553 to 689

Yes, Amendment No 7

90. Single Line Diagram E7.11 - Dashed vs. Solid Line Designation- Drawing E7.11 uses both solid and dashed line weights for equipment enclosures and their internal breaker/bus arrangements, in addition to the color-coded power systems identified in the sheet’s Color Code legend. No legend or general note on E7.11, E7.10, or E7.01 defines what the dashed line designation represents.

For example, PDU-B1 (fully existing equipment, with all internal breakers tagged "(E)") is drawn with a dashed enclosure, while the existing Distribution Panelboard "DBCP" (also fully existing, also showing its own internal breaker schedule) is drawn solid. Similarly, the existing UPS-1/UPS-2 battery cabinets are drawn solid, while the new UPS-B / battery cabinet / bypass assembly is drawn dashed. The dashed vs. solid designation does not appear to consistently track new vs. existing status.

Please confirm what the dashed line designation is intended to represent and clarify its application throughout the single line diagram series.

There is no difference. Sheet E7.11 has been revised with changes clouded for box line consistency. See reference documents attached to Q&A set No. 3.

No

91. Bid Alternate No. 1 [UPS Addition] - Scope Definition-Exhibit 2 (Schedule of Quantities and Prices) lists "Bid Alternate No. 1 [UPS addition]" as a single lump-sum pricing line, with no accompanying scope narrative and no corresponding designation on the drawings.

Please define the specific equipment and work included within Bid Alternate No. 1 - for example, does it include only the UPS-B module itself, or does it also include their associated feeders and conduit?

Please clearly delineate the Bid Alternate No. 1 boundary on the applicable drawings (e.g., E7.11) so that Base Bid and Alternate No. 1 pricing can be accurately separated.

See reference documents attached to Q&A set No. 3, refer to sheet E7.11. The new UPS along with input and output feeders, indicated in dashed lines are a separate scope. If new UPS input and output panels are installed well before the UPS is installed, install the jumper as shown to allow new PDUs to be powered for testing, etc., and possibly for redundant load connection.

IFB No. OP141432 Union Station Gateway (USG) Data Center HVAC & Power Improvement – QUESTIONS AND ANSWERS

IFB No. OP141432 1 Q&A No. 4

Question Answer Amendment?

92.Who is the authority having jurisdiction for fire sprinkler and fire alarm? Are outside agency plan review and permits required?

Los Angeles city Fire Department (LAFD) is the AHJ, Metro has an in house LAFD representative who will be the AHJ and all plan reviews will be coordinated by Metro representative. No

93.Fire Protection System Notes 3, 4 and 5 indicate schedule 40 piping is required for all sizes. F0.01 Scope of Work note 6 indicates branch lines to be schedule 40, mains schedule 10 & riser to be schedule 10. F0.01 Materials and Equipment indicates pipe Dynaflow, Dyn thread, Sch 10 and Sch 40 are acceptable. F0.02 Fire Protection Specifications 2.03-A.2 indicates Sch 10 steel pipe may be used for sprinkler system diameters 2 inch and larger. It is our understanding that Metro requires all schedule 40 black steel pipe. Please clarify what pipe schedules and for what sizes are acceptable.

Schedule 40 shall be provided for all fire protection piping for all size. No

94.Fire Protection Specification 1.08 B indicates at no time shall the building be without fire protection except in areas of new work. If water is to be turned off, then temporary piping is to be installed as required and provide fire watch. Please confirm this only applies to areas affected outside the footprint of the project.

Confirmed, it applies to any area effected outside the footprint of this project. No

95. Double Interlock Preaction Fire Protection Specification

2.10 B.3 allows pendent sprinklers and sidewall sprinklers

installed on return bends where the sprinkler, return bend and branch line piping is in an area maintained at or above 40 deg. F. But 2.10 D.1 states all sprinklers in areas with ceilings shall be quick response recessed flush dry pendent sprinklers...Viking VK482 (no substitutions). Are standard pendent sprinklers on return bends allowed, assuming the sprinklers and piping will be in areas maintained above 40 deg. F, or are dry pendent Viking VK482 dry pendent sprinkler required? Viking VK482 dry pendent sprinklers are required in areas with ceilings No

IFB No. OP141432 2 Q&A No. 4

Question Answer Amendment?

96. The existing pre-action systems were originally hydraulically designed as Light Hazard with extended coverage sprinklers. F0.01 Scope of Work Note 8 requires ordinary hazard group 2 with 130 sf max sprinkler spacing.

Please confirm if this criteria applies to all areas of the project, wet or preaction.

The fire protection systems are provided as performance specifications, with the expectation that the installing contractor will develop the deferred detailed design for AHJ approval, including determining the adequacy of the existing systems and their ability to absorb all the necessary new connections or if it needs to be expanded/upgraded to accommodate. No

97. Is there a domestic only material requirement for fire protection pipe and fittings?

No, Compliance with "Buy America" regulations is not required. No

98. Although the plans do not indicate so, it is possible that existing wet sprinkler main piping is routed above the existing ceilings and will remain above rooms protected by the new pre-action systems. Is that acceptable, or will existing wet system piping require rerouting outside of pre-action protected rooms to the extent possible?

The design intent is to have only pre-action sprinkler piping in the critical spaces, without any wet-pipe. This would include the need to reroute any existing wet piping around the critical spaces. No

99. Fire Protection Specification 2.3 requires an integrated release control panel for each pre-action system cabinet.

Does the existing fire alarm system have the capacity to accept the additional monitoring points?

The fire alarm systems are provided as performance specifications, with the expectation that the installing contractor will develop the deferred detailed design for AHJ approval, including determining the adequacy of the existing systems and their ability to absorb all the necessary new infrastructure/connections or if it needs to be expanded/upgraded to accommodate. No

IFB No. OP141432 3 Q&A No. 4

Question Answer Amendment?

100. RELEASING CONTROL PANEL OPTIONS (SELECT AS

REQUIRED BY LOCAL AUTHORITY OR JOB CONDITION)

A. CLASS A, STYLE D INITIATING DEVICE MODULE:

PROVIDE A CA2Z MODULE TO ALLOW THE INSTALLATION OF

CLASS A, STYLE D WIRING ON THE INITIATING CIRCUIT.

Does the detection and controls releasing panel on the pre-action Sprinkler system need to be Class A?

B. CLASS A, STYLE Z INDICATING APPLIANCE MODULE:

PROVIDE A CAM MODULE TO ALLOW THE INSTALLATION OF

CLASS A, STYLE Z WIRING ON THE INDICATING APPLIANCE

CIRCUIT.

Does the detection and controls releasing panel on the pre-action Sprinkler system need to be Class A?

C. RELAY MODULE: PROVIDE AN ARM-44 RELAY MODULE TO

ALLOW EIGHT (8) ADDITIONAL RELAYS. THE ARM-44 SHALL

CONNECT VIA RS-485 AND 24 VDC POWER

AND SHALL BE RATED FOR 3 AMPS AT 24 VDC RESISTIVE

LOAD. THERE SHALL ALSO BE A DISABLE SWITCH TO ALLOW

FOR MAINTENANCE AND TESTING.

Does the detection and controls releasing panel on the pre-action Sprinkler system need a Relay Module?

D. REMOTE ANNUNCIATOR: PROVIDE A MODEL RA-4410RC

REMOTE ANNUNCIATOR MODULE AND INSTALL IT ON-SITE

FOLLOWING THE INSTRUCTIONS PROVIDED BY THE

MANUFACTURER. THE REMOTE ANNUNCIATOR SHALL BE

MOUNTED ON A STANDARD FOUR GANG WALL BOX

PROVIDED BY THE CONTRACTOR.

Does the detection and controls on the pre-action sprinkler system need remote annunciators? if so where will the remote annunciators be located?

A. Yes.

B. Yes.

C. The fire protection and alarm systems are provided as performance specifications, with the expectation that the installing contractor will develop the deferred detailed design for AHJ approval, including determining the need for the indicated optional items. Coordinate the need and location with the Metro representative as required by…job condition."

The specification is to identify BOD and installation considerations, if needed.

D. The fire protection and alarm systems are provided as performance specifications, with the expectation that the installing contractor will develop the deferred detailed design for AHJ approval, including determining the need for the indicated optional items. Coordinate the need and location with Metro representative as required. The specification is to identify BOD and installation considerations, if needed. No

IFB No. OP141432 4 Q&A No. 4