B09_Amendment_1_-_Attachment_2_-_Scope_of_Work__Rev__1_dated_3_1_2023_0001.pdf

Monocacy National Battlefield (MONO)

Rehabilitate Interior Thomas House Geothermal Piping (FY23)

Scope of Work (SOW)

United States Department of the Interior

NATIONAL PARK SERVICE, Region 1

National Capital Area

Rev. 1/8/2023

Rev. 1 – 3/1/2023

Rehabilitate Interior Thomas House Geothermal Piping (FY23) Page 2 of 6

Scope of Work (SOW) - Rev. 1 - 3/1/2023

SCOPE OF WORK (SOW)

for

Rehabilitate Interior Thomas House Geothermal Piping (FY23)

1. BACKGROUND

As defined by the park’s Foundation Document, “The purpose of Monocacy National Battlefield is to preserve the breastworks, earthworks, walls, and other defenses and shelters used by the Confederate and Union armies on July 9, 1864, as well as the buildings, roads, and outlines of the battlefield; to commemorate the Battle of Monocacy; and to provide opportunities for visitors to understand and appreciate the significance of the Battle of Monocacy within the full context of the Civil War and US

History”.

Historic and non-historic structures are critical to operations that preserve and interpret Monocacy

Battlefield. Repair to critical systems must protect building elements and is pivotal to maintaining and preserving these structures. While the Thomas House is in a good state of repair, the HVAC system has exceeded it useful lifecycle on certain elements and requires replacement to avert possible failure and/or resource damage.

2 PURPOSE

Monocacy National Battlefield, in Frederick, MD seeks a licensed HVAC and/or licensed plumber contractor, with a minimum of 5 years of industry experience working specifically on geothermal

HVAC closed loop piping. This requirement is for piping that is not in the ground but located in the interior of Thomas House. The contractor will replace existing interior piping with High-density polyethylene (HDPE) pipe. Note this is an existing geothermal system and all work will be located in the interior of Thomas House where the current piping and system components are accessible in an underground basement with approximately 5 feet of clearance. Contracted services for this requirement include draining the system, removing the old circulation water, flushing the system to get out existing contaminants and refilling the system with properly mixed water and chemical solution (40 percent glycol). Existing piping must be properly removed without damage to the HVAC system and new

HDPE properly installed on all interior sections. New circulation pumps will be furnished and plumbed to the new HDPE piping. All valves, solenoids or any additional or ancillary equipment that is in the current loop system will be re-plumbed to the new HDPE pipe. All existing heat pumps will be replaced in accordance with engineering drawing recommendations with ‘in-kind’ units. The new system needs to have the same configuration as the existing engineering drawings, which NPS will provide. Once the new interior piping and components have been installed and reconnected to the existing outside geothermal wells, the entire system will need to be checked, tested, and placed in proper operation. It is anticipated the HVAC system will be off during rehabilitation activities. Overall safety, consultation, communication, and teamwork are critical.

It is strongly recommended that the contractor visit and inspect the site to verify all estimated quantities, existing conditions, and to observe the complexities of conducting HVAC operations in a potentially occupied historic access-controlled Government facility. Contract modifications and price adjustments will not be granted based on conditions that could be determined prior to award at the pre-proposal site visit offered by the Government.

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3. SCOPE OF WORK

The contractor shall:

Provide all labor, supervision, materials, tools, supplies, transportation, license, certificates, permits, personal protection equipment, professional services, and equipment incidental to and necessary to remove existing geothermal piping and install new piping suitable for the application at the Thomas House in Frederick, Maryland (4632 Araby Church Road Frederick, Maryland

21704).

3.1 Project Tasks:

3.1.1 - The circulation water/chemical mixture has been contaminated; all water in the closed system needs to be collected and properly disposed of. As-builts are available to estimate the amount of circulation liquid present in the system.

3.1.2 - Remove the existing black iron piping that is used to circulate water on the interior of the basement of the Thomas House through the existing closed loop system.

The system then needs to be re-plumbed with HDPE in the format (layout) that it is currently in (per engineering specs). This will require new straight sections of pipe, elbows, couplers etc. The new piping will need to be able to handle the PSI that is sustained during loop circulation. If their needs to be changes in sizing to the pipe to accommodate this or other factors, it will be noted by the Contracting Officer’s

(technical) Representative (COR) (i.e., 1” black iron to 1.5” HDPE).

3.1.3 - The system needs to be refilled with a water and cleaning solution and circulated through the loop. The cleaning solution cannot damage or be detrimental to any internal components of the systems. The solution will need to be approved by the COR.

3.1.4 - A strainer or filter screen may need to be installed to catch large particles of debris.

3.1.5 - This water/cleaning solution mixture needs to be drained out of the system and refilled with a water solution that contains a neutralizer and inhibitor. This mixture needs to circulate through the system until the water is clear and free of debris or sediment. This may require multiple drain and fills to get the solution free from sediments and debris. Once clear and free of debris or sediment the water neutralizer and inhibitor can be drained. The neutralizer and inhibitor can’t be detrimental to any internal components of the system.

3.1.6 – Replace the existing heat pumps by installing five all new in-kind geothermal heat pump units for each heating/cooling zone of the house. All five are centrally located in the basement of the Thomas House. Engineering Drawings attachment have specifications for each in-kind unit, and different zones have different specifications for the heat pumps. The dimension of the space is very specific for the application; the contractor will need to know there can be no modifications to the structure to accommodate different dimensional heat pumps. The new heat pumps will need to fit in the existing configuration because the structure cannot be modified unless approved by the COR.

3.1.7 – Replace the existing Air Handlers by installing five new air handlers that correspond with each heat pump unit for heating/cooling in each zone of the house. The existing Air Handlers are at various locations of the house ranging from the basement to

Rehabilitate Interior Thomas House Geothermal Piping (FY23) Page 4 of 6 the 3rd floor, sometimes in tight, not easily accessible areas. The new Air Handlers will be installed in the same location/space as the existing, so they need to be similar in specifications and dimensions (reference Thomas House System Engineering Drawings and Component Specs attachment which contains specifications for each in-kind unit;

different zones have different specifications for the air handler). Additionally, this scope of work DOES NOT include replacing the refrigerant lines or ductwork or any components that are not operationally critical, so new air handlers will need to fit what is existing.

3.1.8 - Two new in-kind circulation pumps need to be replumbed to the HDPE pipe.

The existing pumps are two Goulds NPE 2ST1H1G4. These are 1-phase, 230V, 3HP.

There is a Bell and Gossett control panel (ITT Series 350) that regulates the pumps operation. A new control panel or regulation device will need to be furnished if the new pumps are not compatible with the existing control panel. For reference, the control panel is used because only one pump needs to run at a time for the circulation loop.

3.1.9 - All new ancillary piping and new components need to be installed to the new and/or existing piping. This includes but is not limited to ball valves, expansion tank, hoses, triple valves, solenoids, sensors, by-pass feeder and reducing or strainer valves.

3.1.10 - Refill the system with a mixture of water and 40 percent glycol, as well as any other industry standard chemical additives (inhibitors, neutralizers etc.) for closed-loop geothermal systems.

3.1.11 - Turn the system back into an operational state ensuring there are no leaks, no air in the loop that will cause cavitation, and that the system is functioning per all pertaining guidelines (manufactures recommendations, engineering drawings, industry standards etc.). If not, troubleshoot issues to get the system into a functional state per all pertaining guidelines.

Approximate length of pipe for each section of the closed loop:

Description of Piping Length

3” Main Feed Line (to 2” line at Watts Pressure Regulator) 390 inches

3” Main Return Line (from 2” line at Watts Pressure

Regulator) 315 inches

Air Bleed Valve (Off Feed Line) (3/4”) 12 inches

¾” By-pass Feeder Feed 65 Inches

¾” By-pass Feeder Return 100 Inches

Heat Pump One 1” Feed 60 inches

Heat Pump One 1” Return 45 Inches

Heat Pump Two ¾” Feed 35 Inches

Heat Pump Two ¾” Return 15 Inches

Heat Pump Three 1” Feed 58 Inches

Heat Pump Three 1” Return 28 Inches

Heat Pump Four 3/4” Feed 25 Inches

Heat Pump Four 3/4” Return 20 Inches

Heat Pump Five ¾” Feed 50 Inches

Heat Pump Five ¾” Return 28 Inches

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2” Watts Pressure Safety Valve 48 Inches

Water Heater Safety Tank (3/4”) 18 inches

1” Split off on Return 4 Inches

Note: All quantities in table above are provided as information only. Contractors shall be responsible for verifying all measurements and or quantities for this requirement. The contractor shall bid accordingly for actual work described on each structure.

3.2 General Scope Requirements

3.2.1 - Protect all surfaces not being modified in this scope of work by using drop cloths, covers, shields and other protective equipment. The historic foundations and historic joists shall not be damaged at any stages of this project.

3.2.2 - Place cotton waste, cloths, and material, which may constitute a fire hazard, in closed metal containers and remove daily from site.

4. CONTRACTOR ADDITIONAL REQUIREMENTS

The contractor shall furnish and/or provide:

4.1 Supervisor(s) and an Alternate Supervisor(s): A written designation of a supervisor(s) and an alternate supervisor(s) with the same qualifications as the proposed supervisor. The supervisor and/or alternate supervisor is required to be always present on-site, during all operations to direct contract personnel and maintain operations. The on-site supervisor MUST:

4.1.1 Be fluent in the English language in order to effectively communicate with the contractor’s employees and/or subcontractors as well as the COR and other

Government personnel.

4.1.2 Be available for phone calls during all working hours, and have the authority to stop all work or unsatisfactory performance as directed by the COR.

4.1.3 Possess 5 years verifiable experience and technical competence in geothermal

HVAC operations and construction safety practices as well as 2 years supervisory experience, submitted as a resume.

4.1.4 Be responsible for controlling the quality of work and inspecting all completed work to ensure that correct performance requirements are met.

4.2 Sufficient manpower and equipment.

4.3 A trained and experienced workforce that shall be knowledgeable and familiar with the technical aspects and hazards of geothermal HVAC repair, operations, and service.

4.4 Staff recognizable as employees of the contractor. Distinctive clothing shall be worn that is uniform in appearance and include long pants, shirts, hats, and seasonal outerwear, which that bears the name and logo of the company and the name of the employee.

4.5 Daily Work Log

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4.5.1 The contractor shall maintain a daily work log by filling out completely, and as applicable, the Daily Work Log Form provided to them by the Government. The daily work log shall be submitted to the COR via email after each week of work and/or any time requested by the COR, Contract Specialist, or Contracting Officer.

4.5.2 The contractor shall also note in the daily work log the presence of any damage or conditions that may affect the visual quality or the contractor ability to perform work. The contractor shall note and report to the COR any maintenance issues or problems that arise, which are not within the scope of work.

4.6 All materials will be installed to manufacturer specifications.

4.7 All work will follow applicable codes and regulations.

4.8 All materials and labor must carry a one-year workmanship warranty from the date of final inspection.

4.9 The contractor shall provide written descriptions to the park on the maintenance of products, including all product performance data and applicable warranties.

4.10 Hazardous waste (circulation water) must be re-claimed/captured for recycling by the contractor. Manifests shall be submitted as part of the Construction Documents.

4.11 During the course of work, the contractor will take appropriate and reasonable steps to protect and ensure all underlying historic building elements are not damaged or altered by activities specifically performed under this contract.

4.12 Submit a Construction Schedule prior to notice to proceed and continually update as project progresses and with all payment applications.

4.13 Comprehensive and complete Construction Documents that clearly indicate all phases of construction, records, materials, and warranties. The contractor shall include:

• Technical specifications, either presented in a project manual with table of contents or formatted as drawing sheets or included in the set of drawings.

• Manufacturer’s literature

• Operations and Maintenance Requirements

• Performance data

• Record of recycling and disposal

• Contractor certifications, licenses, and insurance documents