SOW_WFRC_D109_Freezer_Room_HVAC.docx
DOCX document 20 KB Posted
- Solicitation number
- 140G0326Q0212
About this file
Statement of Work Summary
This is a Statement of Work (SOW) for HVAC replacement services at the U.S. Geological Survey Western Fisheries Research Center (WFRC) in Seattle, Washington. The project requires replacement of an undersized variable air volume (VAV) system serving Room D109, a 30' x 15' x 12' freezer room housing 11 low-temperature freezers with a combined heat rejection load of 31,000 BTU/hr. The existing 400 CFM Titus VAV box and associated ductwork are insufficient to maintain the required 72°F setpoint, with field measurements confirming the room operating at 75°F. The contractor must furnish and install a new properly sized 1,500 CFM Titus DESV VAV box with 12-inch inlet, new 14" x 18" supply ductwork with two 750 CFM ceiling diffusers, four 325 CFM return air grilles positioned above the freezers, and 18-inch return ductwork. Work includes concrete core drilling in the mechanical room floor, removal of existing equipment, retention and reinstallation of the existing Siemens VAV controller, and coordination with the Siemens Desigo building automation system. The work must be performed by a licensed mechanical contractor with commercial HVAC and VAV system experience during normal business hours (Monday–Friday, 7:00 AM–5:00 PM) with pre-approval and coordination required for any outages to room cooling or AHU-1 operations due to the active 24/7 research laboratory environment.
The contractor shall complete a site inspection no later than 5 days after notice to proceed and submit all proposed mechanical materials and equipment for government approval within 10 days of the inspection. Deliverables include submittal documentation, completion of all demolition and concrete work prior to new installation, installation and connection of the new VAV box with reinstalled controller, supply and return ductwork installation, coordination confirmation with the building automation system prior to closeout, and functional testing verifying 1,500 CFM total supply airflow, proper diffuser and grille operation, VAV box modulation capability, and the absence of ductwork leaks. The work must comply with current mechanical and building codes, Washington State Energy Code, SMACNA HVAC Duct Construction Standards, NFPA 90A, and OSHA 29 CFR 1926 construction safety standards. The point of contact is John Allen, Supervisory Facility Operations Specialist, at jsallen@usgs.gov.
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Other files
| File | Type | Posted |
|---|---|---|
| USGS_WFRC_Equipment_Cut_Sheets_2024-11-22.pdf | ||
| Sol_140G0326Q0212.pdf | ||
| USGS_WFRC_Final_Narrative_2024-11-22.pdf | ||
| USGS_WFRC_Mechanical_Sketches_2024-11-22.pdf | ||
| WFRC_HVAC_replacement_TandC.docx | DOCX document | |
| DBAWD_WA20260108_05182026.pdf |
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Text version
STATEMENT OF WORK
WFRC ROOM D109 FREEZER ROOM HVAC RENOVATION
1.0 INTRODUCTION AND BACKGROUND
The Western Fisheries Research Center (WFRC) requires replacement of the undersized variable air volume (VAV) box and associated ductwork serving Room D109, the facility freezer room, and installation of a properly sized VAV box, supply ductwork, supply diffusers, and return grilles to provide adequate cooling capacity for the thermal load generated by the room's freezer inventory.
The United States Geological Survey (USGS) Western Fisheries Research Center (WFRC) is located in Seattle, Washington. The WFRC carries out research and provides technical assistance to support the best possible stewardship of the Nation's natural resources, emphasizing fish populations and aquatic ecosystems of the West. The WFRC has a 50-year history of excellence in fisheries disciplines and is a leader in the field of molecular and microbiology within the U.S. Geological Survey.
Room D109 is a 30' x 15' x 12' freezer room currently housing 11 low-temperature freezers with an approximate combined heat rejection load of 31,000 BTU/hr. The existing HVAC system serving Room D109 consists of a single 400 CFM Titus VAV box (CR2) fed by a six-inch duct from AHU-1, discharging through one diffuser. This configuration is significantly undersized for the current freezer heat load. Field measurements confirmed the room operating at 75°F against a 72°F setpoint, with both room doors open and supplemental floor fans running. A mechanical engineering cooling study completed in November 2024 confirmed the deficiency and identified the required corrective scope using Trane Trace load modeling software.
| 2.0 | SCOPE |
| 2.1 | Place of Performance – The USGS WFRC, 6505 NE 65th Street, Seattle, WA 98115, Room D109 and the mechanical room above Room D109. |
| 2.2 | Period of Performance – To be specified at time of award. |
| 2.3 | Site Inspection – Contractor to meet onsite no later than 5 days after notice to proceed to review mechanical project requirements, equipment specifications, and site conditions. |
| 2.4 | Work Hours – Work will be performed during normal business hours, Monday through Friday, 7:00 AM to 5:00 PM. Work requiring interruption to Room D109 cooling or AHU-1 operation shall be pre-approved by the WFRC TPOC and scheduled to minimize impact on active laboratory operations. |
| 2.5 | Special Considerations – The contractor will be working in and around an active federal research laboratory operating 24/7. Room D109 houses low-temperature freezers containing irreplaceable biological research specimens. Any planned outage to room cooling shall be kept to the minimum duration necessary and shall be coordinated with WFRC facility staff in advance. Concrete core work in the mechanical room floor will be required to accommodate new ductwork. The contractor must comply with all OSHA standards and applicable WFRC facility safety requirements during performance. |
| 2.6 | General Requirements – The purpose of this project is to replace the existing undersized VAV box and ductwork serving Room D109 with a properly sized 1,500 CFM VAV system including new supply ductwork, two supply diffusers, four return grilles positioned above the freezers, and new return ductwork, in accordance with the Engineering Mechanical Narrative completed in 2024. The existing Siemens VAV controller shall be retained and reinstalled on the new VAV box. |
| 2.7 | Qualifications – Work to be completed by a licensed mechanical contractor with demonstrated experience in commercial HVAC ductwork installation and VAV system work. All work shall meet current applicable mechanical and building code requirements. Concrete core work shall be performed by personnel experienced in concrete penetration in occupied facilities. |
| 2.8 | Administration – Point of Contact: |
John Allen Supervisory Facility Operations Specialist
USGS – WFRC
6505 NE 65th Street Seattle, WA 98115 Email: jsallen@usgs.gov
| 3.0 | TECHNICAL REQUIREMENTS |
| 3.1 | Site Inspection and Submittal – Perform a site inspection of Room D109 and the mechanical room above. Review VAV equipment specifications, ductwork routing requirements, and existing conditions. Meet with USGS facilities staff to discuss project requirements and sequencing. Provide a submittal for all proposed mechanical materials and equipment for Government approval within 5 days of the site inspection. |
| 3.2 | Demolition – Remove and dispose of the following existing equipment and ductwork: |
| 3.2.1 | Existing 400 CFM Titus VAV box (CR2) and the six-inch supply duct serving it from AHU-1. |
| 3.2.2 | Existing 10" x 14" duct between the VAV box and the Room D109 ceiling diffuser. |
| 3.2.3 | Existing single supply diffuser in Room D109. |
| 3.2.4 | Existing 450 CFM return air grille and associated return ductwork routing to the 17-inch duct above Room D111. The 17-inch duct shall be capped at the existing connection point. |
The existing Siemens VAV controller shall be carefully removed, protected, and retained for reinstallation on the new VAV box. The contractor shall not damage or discard the existing controller.
| 3.3 | Concrete Core – Increase the existing concrete floor opening in the mechanical room above Room D109 to accommodate the new 14" x 18" supply duct penetration. Concrete cutting shall be performed with appropriate dust containment. All penetrations shall be fire-stopped and finished per applicable code requirements upon installation of ductwork. |
| 3.4 | New VAV Box Installation – Furnish and install one (1) new 1,500 CFM Titus DESV VAV box with a 12-inch inlet, or approved equal, connected to AHU-1. The existing retained Siemens VAV controller shall be reinstalled on the new VAV box. The contractor shall coordinate VAV controller reinstallation with WFRC facilities staff to ensure proper integration with the existing Siemens Desigo building automation system. |
| 3.5 | New Supply Ductwork and Diffusers – Furnish and install the following new supply air distribution components: |
| 3.5.1 | New 14" x 18" supply duct downstream of the new VAV box, routed through the mechanical room floor penetration to the Room D109 ceiling. |
| 3.5.2 | Two (2) 750 CFM supply air diffusers in the Room D109 ceiling, sized and positioned to distribute 1,500 CFM total supply air evenly across the room. |
| 3.6 | New Return Ductwork and Grilles – Furnish and install the following new return air distribution components: |
| 3.6.1 | Four (4) return air grilles, each sized for 325 CFM (1,300 CFM total), installed above the freezers to capture heat rejection directly at the source and transfer it out of the room. |
| 3.6.2 | New 18-inch return duct connecting all four return air grilles and routing to the mechanical room above. |
| 3.6.3 | Connection of the new 18-inch return duct to the existing 32" x 26" return air duct in the mechanical room ceiling. |
| 3.7 | Controls Coordination – Coordinate with WFRC facilities staff for Siemens Desigo BAS integration of the reinstalled VAV controller. The contractor is responsible for the mechanical installation; WFRC facilities staff will perform or coordinate BAS programming. The contractor shall verify that the reinstalled controller is properly connected and communicating with the BAS prior to project closeout. |
| 3.8 | Functional Testing – Upon completion of all mechanical work, the contractor shall perform functional testing of the new VAV system to confirm: |
| 3.8.1 | 1,500 CFM total supply airflow at design conditions. |
| 3.8.2 | Proper operation of both supply diffusers and all four return grilles. |
| 3.8.3 | VAV box modulation from minimum to maximum airflow. |
| 3.8.4 | No ductwork leaks at connections, seams, or penetrations. |
| 4.0 | APPLICABLE DOCUMENTS |
The following documents apply to the performance of this contract:
| 4.1 | P2S Engineering – USGS WFRC Room D109 Cooling Study, Mechanical Narrative, dated November 22, 2024. |
| 4.2 | Washington State Energy Code (WSEC) – current edition. |
| 4.3 | SMACNA HVAC Duct Construction Standards – current edition. |
| 4.4 | NFPA 90A – Standard for the Installation of Air-Conditioning and Ventilating Systems. |
| 4.5 | OSHA 29 CFR 1926 – Construction Safety Standards. |
| 5.0 | DELIVERABLES |
The contractor shall provide deliverables in accordance with the Reporting Requirements Checklist:
| Reference |
| Requirement |
| Due |
| 2.3 & 3.1 |
| Site inspection of Room D109 and mechanical room above. Review VAV equipment specifications, ductwork routing, and existing conditions. Meet with USGS facilities staff to discuss project requirements. |
| No later than 5 days after notice to proceed. |
| 3.1 |
| Submittal for all proposed mechanical materials and equipment for Government approval. |
| Within 10 days of site inspection. |
| 3.2 |
| Demolition of existing VAV box CR2, six-inch supply duct, 10" x 14" duct, existing diffuser, existing return grille, and associated return ductwork. Capping of 17-inch duct. Retention and protection of existing Siemens VAV controller. |
| Deliverable – prior to new installation. |
| 3.3 |
| Concrete floor opening enlarged in mechanical room to accommodate new 14" x 18" supply duct. Penetration fire-stopped and finished per code. |
| Deliverable – prior to duct installation. |
| 3.4 |
| New 1,500 CFM Titus DESV VAV box with 12-inch inlet installed and connected to AHU-1. Existing Siemens VAV controller reinstalled on new VAV box. |
| Deliverable. |
| 3.5 |
| New 14" x 18" supply duct installed through mechanical room floor to Room D109 ceiling. Two (2) 750 CFM supply diffusers installed in Room D109. |
| Deliverable. |
| 3.6 |
| Four (4) 325 CFM return grilles installed above freezers. New 18-inch return duct installed and connected to existing 32" x 26" return duct in mechanical room. |
| Deliverable. |
| 3.7 |
| VAV controller confirmed communicating with Siemens Desigo BAS following reinstallation. |
| Prior to project closeout. |
| 3.8 |
| Functional test of completed VAV system confirming 1,500 CFM total supply airflow, proper diffuser and grille operation, VAV box modulation, and no ductwork leaks. Written test results provided to WFRC TPOC. |
| Prior to project closeout. |
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