DKGV 1161805 Repair TC Dock B3852 HVAC Draft SOW.pdf

DKGV 1161805 ARTRANS – Repair TC Dock B-3852 HVAC (JCM; 13 Aug 2026)

DRAFT

Statement of Work

DKGV 1161805 ARTRANS – Repair TC Dock B-3852

HVAC Joint Base Charleston Weapons Station

13 August 2026

MISSION IMPACT: The current rooftop HVAC package units are failing or have failed, and repair buy replacement is required to support ARTRANS critical mission and the bed down of approximately 40 new personnel.

MISSION PARTNERS: ARTRANS

A. GENERAL: Work performed consists of the replacement of two (2) failing rooftop packaged air conditioning units (RTU-1 and RTU-2) with modern, high-efficiency, "like-in-kind" units at Building 3852. Additionally, this project requires the comprehensive removal and replacement of all building supply and return ductwork insulation to restore thermal efficiency and indoor air quality, the integration of new units with the existing Building Automation System (BAS) or the provision of standalone programmable controls, and the complete removal and replacement of all suspended acoustical ceiling tiles (2'x2' tegular profile). Contractor shall provide all tools, qualified labor, materials, equipment, supplies, and supervision necessary to engineer, install, and warranty this system in accordance with the following Statement of Work. All work shall be accomplished in accordance with all Federal, State, Local Regulations and guidelines, but not limited to the following:

1. International Building Code

2. International Mechanical Code

3. International Plumbing Code

4. National Electrical Code (NFPA 70)

5. National Fire Code (NFPA 1)

6. Base Architectural Compatibility Guide

7. Unified Federal Criteria (UFC)

8. Unified Facilities Guide Specifications (UFGS)

9. NFPA 90A & 90B: Standard for the Installation of Air-Conditioning and Ventilating Systems

10. ASHRAE 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings

11. SMACNA: HVAC Duct Construction Standards - Metal and Flexible

12. EPA Section 608: Clean Air Act for Refrigerant Management and Recovery

B. LOCATION: B-3852 TC Dock, Joint Base Lindsey Graham, Weapons Station, Goose Creek, SC.

C. SCOPE OF WORK: The project requirements include, but are not limited to the following major items of work:

NOTE: In accordance with 29 CFR 1926.1101 (OSHA’s Asbestos Standard for the Construction Industry) Building Owners are required to inform potential contractors bidding for work of the presence, location, type, and amount of asbestos containing building materials (ACBM) that may be impacted by this project scope of work. The following is applicable: Historical surveys have detected ACBM in the ductwork mastic.

NOTE: Limited Asbestos Survey Required. (Areas to be disturbed by construction activities)

EQUIPMENT DEMOLITION & DISCONNECTS:

1. Contractor shall preform Lockout/Tagout (LOTO) to safely de-energize and lock out all electrical power sources, control wiring, and gas/fuel connections feeding the existing RTU-1, RTU-2, and associated equipment.

2. Contractor shall reclaim/recover/recycle the refrigerant from both RTU-1 and RTU-2 using EPA-certified recovery equipment and storing it in an approved storage container in accordance with EPA Section 608 regulations The recovered refrigerant shall be disposed of at an off base approved disposal site and certified recovery logs will be submitted to the Government Project Manager.

3. Contractor shall provide selective demolition and disposal of the two (2) existing rooftop package units RTU-1 and RTU-2 from the roof . The units shall be properly disposed of off-site in accordance with local environmental regulations.

4. Contractor shall provide selective demolition and disposal of existing supporting curbs to facilitate new unit installation.

NEW EQUIPMENT INSTALLATION ("LIKE-IN-KIND"):

1. Contractor shall procure and install two (2) new high-efficiency rooftop packaged units matching the general capacities, footprints, and electrical characteristics of the existing systems, upgraded to modern refrigerant standards and verified via engineering calculations.

2. Contractor shall perform a professional cooling and heating load calculation for Building 3852, prior to procurement, submittal, or ordering of the new RTU-1 and RTU-2 equipment. Calculations must be performed in accordance with ASHRAE Heat Balance Method, ACCA Manual N, or equivalent industry-recognized commercial load calculation software. (Calculations shall use the 1% cooling and 99.6% heating weather design conditions for Charleston, South Carolina)

3. Contractor shall submit a detailed Load Calculation Report to the Government Representative for approval. If the load calculations indicate that the existing four (4) and ten (10) ton baseline capacity is over or under sized for current building conditions, the Contractor shall propose a revised equipment tonnage for engineering review prior to order placement.

RTU-1 PERFORMANCE SPECIFICATIONS (RHEEM COMMERCIAL SERIES OR APPROVED EQUAL):

• Manufacturer: Rheem (or approved equal)

• Model Series: Commercial Packaged Air Conditioner (comparable to Rheem Renaissance Line with humidity control)

• Nominal Capacity: 3 to 4 Tons (subject to validation by the load calculations)

• Electrical Power: 208/230 V.A.C., 60 Hz, 3-Phase (208 V /3 Ph/60 Hz )

• Minimum Circuit Ampacity (MCA): ~35-40 Amps (Contractor to verify exact electrical matching)

• Maximum Overcurrent Protection (MOP): 40 Amps

• Auxiliary Electric Heat: 7.5 kW integrated electric heater kit

• Blower Drive Type: Direct or Belt Drive with high-static capability to match existing duct pressure drop.

• Active Dehumidification System: Unit must be equipped with an active, factory-installed Hot Gas Reheat

(HGRH) dehumidification system (e.g., Rheem HumidiDry™ or approved equal). The system must use a modulating reheat coil to reheat the air leaving the evaporator coil during high-humidity periods without over-cooling the occupied space, maintaining indoor relative humidity below 60%

• Refrigerant Type: Modern eco-friendly refrigerant (R-410A or R-454B/R-32 compliant with current EPA Phase-down rules)

RTU-2 PERFORMANCE SPECIFICATIONS (BASED ON EXISTING AAON RM-004 NAMEPLATE):

• Manufacturer: AAON, Inc. (or approved equal).

• Model Series: Packaged Rooftop Unit (comparable to RM Series)

• Nominal Capacity: 3 to 4 Tons (subject to validation by the load calculations)

• Electrical Power: 208 V.A.C., 60 Hz, 3-Phase ((208 V /3 Ph/60 Hz)

• Minimum Circuit Ampacity (MCA): 38 Amps

• Maximum Overcurrent Protection (MOP): 40 Amp.

• Auxiliary Electric Heat: 7.5 kW ((25.6 MBH ) maximum output), 21 Amps operating current

• Evaporator Blower Motor: Nominal 1.0 HP, 208V, 3-Phase (1760 RPM )

• Power Exhaust Fan: Nominal 1.0 HP, 208V, 3-Phase (1760 RPM )

• Refrigerant Type: Modern eco-friendly refrigerant (R-410A or R-454B/R-32 compliant with current EPA

Phase-down rules)

4. Contractor shall install the new Rheem RTU-1 (or equal) on the roof. Route new supply/return ductwork through the existing 48" W × 28" H" opening in the wall. Install sheet metal flashing at the wall penetration and enclose/seal the opening to achieve a weather tight (air and water) seal around the duct. Installation will include new equipment curb/curb adapter.

5. Contractor shall install the new AAON RTU-2 (or equal) on the roof. Provide a new, equipment curb/curb-adapter to support the unit and accommodate the sidewall horizontal duct distribution layout. Duct through the designated wall penetration.

6. Contractor shall provide and install flashing and weather proofing at all structural, roof, and wall penetrations, using flashing, counter-flashing, and commercial-grade, weather-resistant polyurethane sealants to guarantee a 100% watertight installation.

7. Contractor shall provide an install high-efficiency neoprene or spring vibration isolation curbs/pads to minimize acoustic and structural noise transmission into the building.

8. Contractor shall re-wire electrical service from the existing disconnect switches to the new units. Replace any aged, corroded, or undersized liquid-tight flexible conduit and conductors. Install new external, lockable, NEMA 3R fused disconnect switches if existing switches show signs of wear or do not comply with current NEC standards.

TEMPERATURE CONTROLS:

1. Contractor shall provide and install two (2) new commercial-grade, 7-day programmable smart thermostats with integrated humidity sensing such as Honeywell Commercial VisionPRO 8000 with IAQ dehumidification control (or approved equal).

2. The thermostat serving RTU-1 must feature dedicated terminals to control the Hot Gas Reheat active dehumidification circuit independently of cooling calls.

3. Thermostats must feature password-protected keypad lockouts, auto-changeover, multi-stage control 2 Heat /2 Cool minimum, and backup battery power.

4. Contractor shall coordinate physical placement of thermostats away from direct sunlight, drafts, and localized heat sources to ensure accurate zone sensing.

DUCTWORK INSULATION REMOVAL & REPLACEMENT:

1. Contractor shall provide selective demolition and disposal of approximately six hundred twenty (620) linear feet of existing supply and return ductwork insulation (varying sizes) within building 3852. Insulation shall be stripped and completely replaced to restore thermal boundary efficiency and mitigate any mold or condensation issues.

Ensure duct surfaces are clean, dry, and free of adhesive residues.

2. Contractor shall inspect all exposed sheet metal ductwork for air leakage, gaps, or structural damage. Seal all joints, seams, and connections using UL 181A-M or 181B-M approved mastic sealant, prior to re-insulating.

3. Contractor shall provide duct cleaning of approximately six hundred twenty (620) linear feet of existing supply and return ductwork insulation (varying sizes) within building 3852.

4. Contractor shall provide and install new insulation on all supply and return ductwork. Insulation shall be a minimum of two (2) inch thick, foil-faced fiberglass duct wrap (FSK jacket) providing a minimum installed thermal resistance of R-6.0 (or R-8.0 if in unconditioned spaces, in compliance with ASHRAE 90.1).

5. Contractor shall ensure that all insulation seams are overlapped by a minimum of two (2) inches and securely taped with matching aluminum foil tape, squeegeed flat to form a continuous, vapor-sealed barrier.

6. Contractor shall provide and install sheet metal saddle protectors at all duct hanger locations to prevent the insulation from crushing.

7. Contractor shall provide selective demolition and disposal of approximately thirty one (31) existing supply/return diffuser grilles.

8. Contractor shall provide and install approximately thirty one (31) existing supply/return diffuser grilles.

SUSPENDED CEILING TILE REPLACEMENT:

1. Contractor shall provide selective demolition and disposal of approximately three thousand three hundred (3,300) square feet of existing suspended acoustical ceiling tiles throughout the office spaces, corridors, and designated areas served by the ductwork.

2. Contractor shall inspect the existing exposed tee suspension grid and straighten any warped, sagging, or misaligned grid members. Replace damaged hangers, wires, or wall moldings to ensure a level and secure grid system.

3. Contractor shall provide and install new approximately three thousand three hundred (3,300) square feet of new 2’ x 2’ Tegular-Edge (Reveal) Acoustical Ceiling Tiles (comparable to Armstrong Dune, Cortega, or approved equal).

Specifications: Class A fire-rated, minimum NRC (Noise Reduction Coefficient) of 0.50, high light reflectance (minimum 0.80), and sag/humidity-resistant treatment.

4. Tegular tiles must seat cleanly within the grid reveal without binding, presenting a uniform, shadow-line aesthetic across the entire ceiling plane. Carefully cut tiles around existing light fixtures, air diffusers, sprinkler heads, and return grilles to ensure a snug, gap-free fit. Clean any smudges, handprints, or dust from the ceiling tiles prior to hand-off.

GENERAL SITE REQUIREMENTS:

1. Work areas around project site will be occupied by the using activity during work. Caution must be taken to ensure all safety work practices are adhered to while construction work requirements are performed.

2. All work to be performed during normal working hours (0630-1700), Monday-Friday.

3. Caution must be taken in all work areas of the facility to avoid physical or cosmetic damage to existing government property. Any damage to government property resulting from construction procedures shall be the responsibility of the contractor.

D. ENVIRONMENTAL: Refer to Division 1 Specification (01 57 19) Temporary Environmental Controls. The Contractor shall comply with all applicable requirement stated in the Toxic Substances Control Act of 1976. All materials used in the performance of this contract shall be applied in strict accordance with manufacturer’s printed label instructions and all applicable standards. The use of Class I ozone depleting substances, asbestos containing materials, and lead paints are strictly prohibited. Contact the 628 Civil Engineer Squadron Environmental Office at (843)-963-1473 for any asbestos or lead paint related questions.

E. WASTE DISPOSAL/RECYCLING: Refer to Division 1 Specification (01 57 19) Temporary Environmental Controls. The contractor shall recycle all recyclable materials generated during demolition. All waste materials generated by all work under this contract shall be handled, transported, stored, and disposed of off base at no additional cost to the government, by the contractor and or sub-contractors, at any time in accordance with all applicable federal, state, or local laws, ordinances, regulations.

F. SUBMITTALS: Refer to Division 1 Specification (01 33 00) Submittal Procedures. See Attachment 15, Submittal Register 4122-R for minimum submittal requirements for this delivery order.

1. Progress/Construction Schedule AF Form 3064

2. AF Form 66

3. Activity Hazard Analysis(s)

4. HVAC Equipment Cut Sheets

5. Load Calculations/Equipment Sizing

6. Duct Insulation, Mastic & Tape

7. Electrical General & Disconnects

8. Supply/Return Diffuser Grilles

9. Roof Curb/Curb Adapters

10. Sheet Metal Flashing, Counter Flashing & Sealant

11. Programable Thermostats

12. Ceiling Tiles

12. Closeout Documents (As-Built Drawings, Warranty Letters)

G. SAFETY: Refer to Division 1 Specification (01 35 26) Governmental Safety Requirements. The Contractor shall comply with all OSHA safety regulations, the latest edition of EM-385-1 and 29 CFR 1910, if discrepancies occur the more stringent requirements shall govern. All applicable submittals for various Definable Features of Work (DFOW’s) required by EM-385-1 shall be submitted prior to commencing work.

H. OUTAGES: Refer to Division 1 Specification (01 35 26) Governmental Safety Requirements. Outages will be coordinated with Government PM.

I. PERMITTING: Refer to the specific permit sections of Division 1.

J. CLOSEOUT DOCUMENTS: Refer to Division 1 Specification (01 33 00) Submittal Procedures.

Warranty (SD-3) Contractor’s As Built/Record Drawings (SD-11) Real Property Records (SD-11) Operation & Maintenance (O&M) Manuals/Data (SD-10)

- End Statement of Work-