B08_Solicitation_Attachment_1_SOW.pdf

LOWE 328040 Replace Air Handler and Upgrade Controls at LTC

SCOPE OF WORK

The current Lowell Technology Center (LTC) is a tenant in a space leased from the Lowell National

Historical Park. The building owner is Peabody Properties/Market Mills. The building is historic. While there is no Historical Structures Report for the Lowell Manufacturing Facility (Market Mills), interior loadbearing, historical fabric, timber beams and posts are not adversely impacted by this cyclical upgrade.

The building has a sprinkler system. The building is oriented on an east west axis, with the second-floor mechanical room adjacent an exterior wall on the north side of the building (facing the street). The floor to ceiling height is approximately 106” (8’-10”). The current AHU (Air Handler Unit) brings in fresh air from a horizontal duct, with a combined window/louver at an existing masonry opening. The exterior air supply duct shall be reutilized, and connections shall be made to existing ducting.

Heating loop is existing and shall be utilized. The circulator pumps for the heating loop are in Market

Mills building and are fairly new along with the boilers that supply the loop.

This project is to remove and replace in kind the existing 10-ton 1980’s Trane AHU (SAUA-C106-D) with 48” x 32” fresh air intake and replace it with a new 6-ton AC-3 with energy recovery and add a new

3 ton mini split adjacent the studio video control room (also on the second floor) to balance the needs of the control room and equal the overall existing tonnage of the existing unit. This mini split shall have a new exterior wall mounted condenser on the south side façade. Existing power is 208v/60 HZ/3-phase, available with circuit space at the nearest sub-panel. The contractor shall confirm power and provide as necessary items needed to make new the system operational. An alternate replace in kind design can be proposed but shall exceed the design requirements of the existing system (10% more efficient and cost beneficial). Provide high energy efficient fan coil units and controls systems supported by a minimum of

MERV 13. All necessary equipment, pipes, insulation, valves, pumps, fans, meters, strainers, stainless steel pan, condensing drain piping, vibration isolating pads, steel frame support if needed, all parts listed or unlisted as needed for a newly complete functioning system shall be provided. The existing fire alarms shall be integrated with the new system.

Provide building automation system controls (connect to existing Trane building system). This shall consist of network controllers, building control units (BCU), programable control module (PCM) and other electronic control devises. These devises control building temperatures, heating and cooling loops, fresh air system and other components that make up the complete HVAC system and controls. New Trane network controllers will allow the building HVAC systems to be connected and controlled from several desk top locations in the park.

Method and means to replace the unit is at the discretion of the contractor, but it is envisioned that an adjacent exterior louver can allow the removal and installation of the new air handler. This is above a sidewalk at Market Street. Historical fabric shall be respected, and stipulations followed, found at the bottom page in this scope of work.

After the Contracting Officer accepts the design, the approved submitted equipment shall be ordered and installed. A building permit is required from the city of Lowell. Provide summer and cooling cycle commissioning and provide a report. Provide a one-year warranty for labor and manufactured parts. The old unit and associated parts shall be demolished or recycled and removed disposal manifest to be provided.

Work to meet 2024 International Mechanical Code, NFPA 70 National Electrical Code, and the 2024

International Existing Building Code. Provide manufacturer’s warranty and one year for labor and parts.

The leasing tenant will occupy the building during rehabilitation work.

List of submittals requested:

- 01 Accident Prevention Plan

- 02 Quality Control Plan

- 03 Schedule

- 04 Schedule of Values

- 05 List of Superintendent, major sub-contractors

- 06 Electrical

- 07 HVAC Mechanical with plan, section, & elevation of unit(s)

- 08 Joint Sealers (if any used)

LIST OF CONTRACT LINE ITEMS - LOWE 339663

Contract Line Item No. 0001 Base Bid

This item consists of replacement of one second floor air handler and all associated ducting and piping connections as indicated in the contract documents: SOW, Performance Specifications, and drawing A-1.

SPECIFIC ENGAGEMENT WITH HISTORICAL FABRIC

1. Potential fastening to existing load bearing brick masonry, multiple wythe exterior and interior walls.

2. Potential fastening to underside of existing 6" x 12" structural timber beams (Virgin heart pine timber/Southern Yellow Pine timber).

3. Potential fastening to underside of exposed pine plank ceiling boards, 9/16" thick x 2" planks over 2 3/4" thick planks 8-12" width.

4. Potential to drill through existing non-loadbearing, non-historical walls, and partitions to run electrical and controls cabling.

5. Potential coring through existing brick masonry bearing walls to provide access for electrical conduits and control cabling runs.

6. Coring through existing floor/ceiling construction (historical floors / ceilings), NOT allowed unless able to run through existing penetrations.

Specific selective demolition scope of work items:

1. Selective demo of existing HVAC equipment, hangers, stabilizer bars, fasteners in existing brick masonry bearing walls and timber beams / floor ceiling assembly.

2. Selective demo of non-historical acoustical ceiling sections and suspension system.

3. Removal of existing HVAC equipment via freight elevator to disposal vehicles.

4. Removal of Existing exterior window and/or louvers.

New construction scope of work items:

1. Anchoring into existing brick masonry bearing walls – where anchoring into existing masonry bearing walls may be necessary for the installation of HVAC unit hangers and seismic bracing:

a. Fasteners may be installed ONLY in existing mortar joints. Pre-drilling is recommended. If fasteners larger than 3/8” mortar joint thickness are required review with Park 106 Compliance Coordinator / Historical Architect in advance of scheduled activity to inspect and evaluate existing conditions.

b. Powder actuated fasteners are prohibited from use into existing masonry walls.

c. Use the shortest structurally sound fasteners able to hold new door frames.

2. Fastening to existing virgin heart timber beams and plank ceiling. Fastening to the underside of existing 6" x 12" structural timber beams (Virgin heart pine timber/Southern Yellow Pine timber) and /or the underside of exposed pine plank ceiling boards, 9/16" thick x 2" planks over 2 3/4" thick planks 8-12" width is allowed within the following 106 compliance controls:

a. Powder actuated fasteners are prohibited from use into existing timbers.

b. Use the shortest structurally sound fasteners able to hold new construction

(recommend 3/4"-1 1/4" depth wood screws).

3. Fastening into existing wood plank flooring (unit frames and/or unit vibration isolation of stabilizers): The existing historical floor / ceiling construction consists of 9/16" thick x 2” planks virgin heart pine planks x various lengths, over 2 3/4" thick planks 8-12" width x various lengths.

a. Powder actuated fasteners are prohibited from use into existing wood floors.

b. Use the shortest structurally sound fasteners able to secure new construction

(recommend 3/4"-1 1/4", max. 2” depth wood screws).

c. Wherever possible avoid fastening to historical floors and fasten / anchor to existing or new wall construction.

4. Control Cable Runs:

a. Controls cable, color "white" to match existing ceilings, shall be run in existing cabling trays to the maximum extent feasible. Runs from the trays to new camera and

PAC devices shall be secured to existing hangers where possible with "zip" ties, snipped, color white.

b. Where new fasteners may be required to secure cabling runs, to avoid sagging, recommend using round cable wire clips with single nail, color "white". Limitations on fasteners: 1. Powder actuated fasteners are prohibited from use into existing wood timber beams, and finish ceiling boards. 2. Use shortest structurally sound fasteners able to hold cabling and Wi-Fi devices. Lead-in-Construction 1. For installation of mounting plates avoid areas where there may be peeling or chipping LCMs (finish paint).

5. New Electrical Conduit (if required): where new electrical and low voltage supply wiring is required to support new PAC and camera devices in conduit, please use minimum conduit sizes by code. Refer to fastening guidance in items 1-2 for fastening at existing brick wall and existing wood ceilings and timber beams.

a. Conceal conduit visually where possible, paint to match ceiling color.

b. Penetrations / existing GWB partitions– minimize penetrations in existing non-load bearing GWB partitions. Ensure all penetrations are fire caulked in accordance with

Code.

c. Penetrations / existing brick masonry – identify locations where penetrations for electrical conduit will be required for new electrical conduit. Review locations with the 106 Compliance Coordinator / Historical Architect. Penetrations where possible should utilize existing through-wall penetrations. Where new penetrations may be required, and after review with the 106 Compliance Coordinator / Historical

Architect, core drilling should be limited to the smallest openings to run new conduits-do not over core.

END OF SCOPE OF WORK