140G0325Q0176_Amend_1_Q_and_A_documentv_0001.pdf

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Additional Questions – HVAC Replacement at Hog Canyon

1. Question: We have experience with this type of system but only in [Country], in USA we did only repair for this type of systems. Will it work for you?

Answer: Yes, this is acceptable.

2. Location Confirmation

Please confirm the RFQ is only for HVAC system replacement at the USGS Hog

Canyon Microwave Radio Relay site (not Vollmer Peak or Palo Escrito).

Answer: only the HVAC replacement at Hog Canyon.

3. Existing Equipment

Outdoor & indoor unit make/model/serial, nameplate photos preferred.

Answer: See photos below. Unfortunately, these units do not have legible markings or nameplates.

Image 1. Outside view of HVAC units (July 2025).

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Image 2. Zoomed view of outside unit (July 2025). Label is illegible. Stamp appears to read “FAZ, a Division of DCM, Made in Turkey.” Model type appears to be “IP 68.”

Image 3. Inside view of HVAC units (July 2025). No visible information for make/model of units.

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Image 4. View of existing controller (July 2025). Make/model appears to be “CAREL pCO XS.”

Cooling capacity (Btuh/tons) and (if applicable) heating capacity; refrigerant type.

Answer: Unknown. Unfortunately, we do not have this information.

Electrical nameplate: voltage/phase/Hz, MCA/MOP, existing breaker size, and conductor sizes/run length.

Answer: See photos below. Conductor sizes/run length is unknown.

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Image 5. View of DC power bank (July 2025).

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Image 6. Zoomed view of DC power bank (July 2025).

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Image 7. View of breaker panels (July 2025).

Image 8. Zoomed view of breaker panel (July 2025).

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Image 9. View of HVAC panel (July 2025).

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4. Controls and Monitoring

Required points for Asentria SiteBoss 550. Preferred controller class (CommStat4-equivalent ok?) and lead/lag rotation/N+1 expectations.

Answer: Asentria SiteBoss 550 interfaces with HVAC controller via ModBus. The MARVAIR CommStat4 is preferred because most of our other relay sites have this HVAC controller and it fully integrates with our SiteBoss remote site manager units. Will defer to Contractor expertise for Lead/Lag/N+1 considerations.

5. Thermal Performance Targets

Target room setpoint/deadband (°F) and humidity %RH. Any IT/RF heat load estimate or “worst case” internal load we should design around.

Answer: Target room temperature 68F – 72F. Target relative humidity 44% - 55%. The primary environmental concern is high outdoor temperatures (100F +) in the summer.

6. Access, Logistics, and Safety

Site access (badging/escort), RF exposure or lockout requirements, work hours/outage window for cutover.

Answer: Hog Canyon is located on private property. USGS will arrange access and provide an escort. Work shall occur Monday through Friday during normal business hours – typically 0700 to 1700. The cutover can occur at any time with advance notice.

Hog Canyon is a microwave radio communications facility with RF transmissions in the 900 MHz, 4.7 GHz, and 5.8 GHz bands: all radios/antennas are within FCC and NTIA RF thresholds.

There are no lockout/tagout requirements.

Rigging/lift constraints (road approach, crane/pick points), debris disposal location.

Answer: Hog Canyon is located on a cattle ranch and can only be accessed via dirt/grass/gravel roads. 4X4 capability is recommended. To prevent damage to the roads, access is restricted after significant rains.

Hog Canyon is located on private property. The Contractor is responsible for locating a suitable off-site debris disposal location. Debris shall not be left on Hog Canyon property.

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7. Deliverables and Admin

Required submittal format (cutsheets, wiring, as-builts, O&M) and commissioning/test documentation.

Answer: No required format: PDFs, Visio drawings, etc. are acceptable.

8. Is there an opportunity to visit the site prior to due date of SOL?

Answer: USGS is unable to support a site visit prior to the 9/22/25 solicitation closing date.

Please see images below of the Hog Canyon Relay site and access roads.

Location Coordinates: 35.86661, -120.479603

Image 10. Google Maps satellite imagery of Hog Canyon relay site (2025).

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Image 11. Drawing of Hog Canyon Relay site. Shelter dimensions approx. 12’ X 16’.

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Image 12. Hog Canyon relay site tower and shelter (June 2024).

Image 13. Unimproved roads at Hog Canyon (June 2024).

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Image 14. Hog Canyon shelter and seismic site (ca. 2021).

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Image 15. Hog Canyon shelter and solar panel arrays (ca. 2021).

9. Are you able to supply data plates from the existing AC units?

Answer: Unfortunately, the units do not have data plates. Please see above photos.

10. The model number of one of the existing exterior units?

Answer: Please see photos above. The labels/nameplates on the exterior units are illegible due to sun damage. Make appears to be “FAZ, a Division of DCM, Made in Turkey.” Model type appears to be “IP 68.”

11. The square footage of the building where the HVAC units are to be replaced?

Answer: Shelter dimensions are approximately 12’ x 16’, or 192 ft2.

12. Any prevailing wage/certified payroll you want us to use.

Answer: U.S. Department of Labor Payroll Sheet is attached.

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13. Evaluation criteria (best value or lowest price technically acceptable).

Answer: Evaluation Criteria is best value to the government using the following factors:

Firm, Fixed Price, Technical Capability of personnel and equipment and Experience.

The Contractor shall have experience with three (3) or more installations of communications shelter HVAC systems of comparable size and complexity. Each of these installations shall have performed satisfactorily for at least one (1) year after final acceptance by the user. Include the names, locations, and points of contact for these installations as a part of the submittal.

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